Odor trape apparatus

Abstract

 An order trap apparatus is provided for conveying wastewater to an external drain. The order trap comprises a liquid container 14 having an entry opening 16d. A baffle 16a, 16b device the container into an entry compartment and a disc charge compartment. A portion to the liquid sealant 20 is located in the entry compartment and forms a sealant layer floating on the top of the wastewater. A passage point is defined by the baffle, such that liquid sealant 20 drawn beneath the sealant layer is buoyed upwards and can rise back to the sealant layer. The baffle comprises one or more non-vertical segment 16b and the link of a liquid flow path along the baffle is sufficient that a substantial portion of liquid sealant rises back to the sealant layer.

Description

[0001] The present application is a Continuation-in-Part of both U.S. Patent Application Serial No. 08/548,281, filed October 25, 1995, and PCT Application No. PCT/US95/16064, filed December 11, 1995, both entitled Horizontal-Flow Oil-Sealant-Preserving Drain Odor Trap.

Technical Field

[0002] The present invention relates to sealed odor traps for waterless urinals, anti-evaporation floor drain traps, and the like, and it is more particularly directed to improvements in the internal structure of oil-sealed odor traps for prolonging sealant retention and for protection against high pressure water flushing.

Background of the Invention

[0003] With increasing emphasis on water conservation, there is renewed interest in toilets and urinals designed to minimize the amount of water consumed in flushing to mitigate excessive demands on water supplies as well as on wastewater disposal systems, both of which have tended to become overloaded with increasing populations.

[0004] Sanitation codes require urinals to provide an odor seal to contain gasses and odors which develop in the drain system: this function is conventionally performed by the well known P-trap or S-trap in which the seal is formed by a residual portion of the flushing water. This seal effectively locks in sewer odors from the drainpipe beyond the trap, however the upward-facing liquid surface communicates freely with the user environment, so that the trap must be kept free of residual urine by copious flushing to prevent unacceptable odor levels from the liquid in the trap; therefore a large amount of water is consumed in flushing these conventional urinals. Especially in the U.S. over many years when water was cheap and plentiful, conventional flushing type urinals and water-wasteful toilets held an unchallenged monopoly. However more recently, threatened and real water shortages have aroused new environmental concerns and heightened conservation awareness as evidenced by the introduction of low flush toilets.

[0005] As the cost of water increases and budgets tighten, the prospect of a viable waterless urinal system becomes extremely attractive to a wide range of public agencies, cities, states, penal institutions, defence establishments, recreational and parks departments and the like. Waterless urinals utilizing oil-sealed odor traps are becoming viable. However, the present inventor has discovered that a key factor in their potential is the attainment of low maintenance, and that this is largely dependent on the longevity of the liquid sealant, which in turn is related to the internal structure of the odor trap. Thus, the present inventor has recognized that improvements are desirable both in the rate of depletion under normal service conditions and in protection against catastrophic sealant loss due to high pressure water flushing, which though not required, can occur inadvertently.

[0006] It is a primary object of the present invention to provide an improved oil sealed odor trap for a flushless urinal or an anti-evaporation floor drain that not only meets the usual objectives of eliminating the need for a P-trap in the drain line while complying with U.S. sanitation standards, being economical and easy to manufacture and install, and performing reliably and efficiently with low maintenance requirements, but more particularly with regard to depletion of oily liquid sealanc, it is a primary object to structure the trap in a manner to largely prevent escape of sealant by causing stray droplets of sealant drifting buoyantly in the flow path to return to the main sealant body.

[0007] It is a further object to configure the odor trap such that it can be easily installed and removed from a permanent drain terminal plumbing fixture.

[0008] It is still further object that the odor trap should be constructed and arranged to prevent loss of sealant in the event of high pressure flushing with water.

List of References
Patent No:	Patentee:
303,822	D'Heureuse
1,050,290	Posson
3,829,909	Rod, et al.
4,026,317	Ekstrom
4,028,747	Newton
4,045,346	Swaskey
4,244,061	Webster, et al.
4,263,934	Redden, et al.
4,411,286	Ball
4,432,384	Guiboro
4,773,441	Biba
5,159,724	Vosper
5,203,369	Hwang
318264 Germany	Zeigler
2816597.1 Germany	Ernst
606,646 Switzerland	Ernst

Statement of the Prior Art

[0009] U.S. Patent No. 303,822 (D'Heureuse) disclosed a wastewater pipe S-trap into which a disinfectant or deodorizer is introduced.

[0010] The use of an oil as a recirculated flushing medium in a toilet system was disclosed in U.S. Patent No. 3,829,909 (Rod, et al.).

[0011] The use of oil in toilets to form an odor trap has been disclosed in German Patent No. 121356 (Beck, et al.) and in U.S. Patent Nos. 1,050,290 (Posson) and 4,028,747 (Newton).

[0012] Bell traps, essentially a coaxial form of S trap, have been known for over a century: a popular form is exemplified in German Patent No. 318264 (Zeigler). Multiple baffle structure is disclosed in U.S. Patent No. 4,026,317 (Ekstrom). Center-entry coaxial trap configurations are shown in U.S. Patent Nos. 4,045,346 (Swaskey) and 5,203,369 (Hwang).

[0013] Beetz introduced an oily liquid layer floating in the trap as an odor barrier through which urine and water can permeate downward. Beetz taught making the oil mixture to have disinfectant properties and to have "innate adhesion power to attach itself to the odor lock parts so that the latter cannot be attacked by urine". Beetz taught daily maintenance, including, cleaning, and coating the cast iron parts of the urinal, including the housing of the odor trap, with the oil mixture, stating that "the oil has the property that said parts absorb so much of it that the oil film somehow repels the urine". Beetz' requirement for daily cleaning and maintenance dictated an easily-disassembled three piece structure with a leakage-prone bottom interface joint, and his requirement for the sealant to also act as a disinfectant is now believed to have caused excessive depletion of the sealant.

[0014] Other examples of oil-sealed traps are found in German Patent No. 2816597.1, and Swiss Patent No. 606,646 (Ernst), practiced under the trademark SYSTEM-ERNST.

[0015] The foregoing examples of traps found limited use in Europe. Typically, they were utilized in a "low flush" rather than a "waterless" manner, e.g. the Beetz patent was classified under water pipe lines, and the specification thereof refers to "water and urine". The odor trap was mounted beneath the floor level and set in a concrete swale, functioning as an occasionally-flushed trough type or stall urinal of a type which is no longer recognized in U.S. building and sanitation codes.

[0016] A flushless urinal disclosed in U.S. Patent No. 4,244,061 (Webster, et al.) uses no oil, but instead relies on a small "plug flow" entrance opening associated with a P trap, and is based on the premise that "the urine in the trap during normal use will be fresh and therefore without unpleasant odor".

[0017] A unitized cylindrical cartridge odor seal for a waterless urinal was disclosed by the present inventor as a joint inventor in U.S. Patent Application 08/052,668 filed 04/27/93 and in a continuation-in-part thereof 08/512,453 filed 08/08/95, in the category of an oil-sealed coaxial edge-entry trap having a cap part with an attached downward-extending tubular vertical partition.

[0018] A key parameter of oil-sealed odor traps for waterless urinals is the amount of sealant depletion that takes place under normal service conditions over periods of time and frequency of usage. Related to this is the possible partial or complete loss of sealant due to the abnormal condition of unnecessary but unavoidable high pressure flushing with water. While some modern oil-sealed odor traps are considerably improved over early versions, there remains an unfulfilled need for further improvements in the above-described aspects of sealant preservation: such improvements are provided by the present invention.

Statement of the Invention

[0019] The above and other objects have been met in the present invention of a unitized plastic oil-sealed odor trap that departs from conventional practice of predominantly vertical liquid flow through the trap, instead the trap is constructed and arranged in a special manner such that a substantial portion of the total flow path is made to be generally horizontal and to be located in a region where stray droplets of sealant, due to buoyancy, will migrate upwardly back to the main sealant body, either directly or as guided by a sloping baffle configuration. Thus, escaping of sealant down the drain is largely prevented.

[0020] The odor trap is configured such that it can be economically made from two molded plastic parts, i.e., a main compartment part and a cap/baffle part, that can be molded from plastic and joined by thermal bonding into a unit configured as a replaceable cylindrical cartridge that can be charged with sealant and sealed with a sticker for shipment so that upon installation it is necessary only to install the cartridge and remove the sticker.

[0021] In service, required maintenance, i.e. sealant checking and replenishment, if and when needed, can be easily performed with the unit in place.

[0022] The cartridge is shaped to be easily pushed into place by hand and held frictionally in a mating recess provided by a casing that can be installed as part of the host plumbing, either in a urinal or in a floor drain. For drain cleaning or replacement purposes, the odor trap can be removed with a special simple hand tool.

[0023] The shape of the entry compartment provides a sheltered region to which sealant tends to be temporarily displaced in the event of high pressure water flushing, thus avoiding catastrophic sealant loss.

Brief Description of the Drawings

[0024] The above and further objects, features and advantages of the present invention will be more fully understood from the following description taken with the accompanying drawings in which:

FIG. 1 is a cross-sectional view of an oil-sealed coaxial odor trap of known art;

FIG. 1A is functional diagram representing the left hand half of FIG. 1;

FIG. 2 is a functional diagram illustrating the principles of the present invention utilizing predominantly horizontal flow;

FIGS. 3 and 4 are functional diagrams illustrating two different baffle configurations in edge-entry coaxial trap structures according to the present invention;

FIGS. 5-8 are functional diagrams illustrating different baffle configurations in center-entry coaxial odor trap structures according to the present invention;

FIG. 9 is a three-dimensional view of a center-entry cylindrical odor trap cartridge;

FIG. 10 is a three-dimensional cutaway view of an embodiment of a horizontal-flow odor trap cartridge of the present invention having a cylindrical container and a non-coaxial internal configuration with vertical and horizontal baffle portions and an offset tubular drain stand;

FIG. 11 shows an alternative illustrative embodiment derived from FIG. 10 with a flat-partitioned drain stand;

FIG. 12 shows a cross-sectional view of a preferred embodiment of the present invention, similar to FIGS. 10 or 11, but having the lower baffle portion sloped for additional recovery of stray sealant;

FIG. 13 shows a cross-sectional view of another preferred embodiment of the present invention;

FIG. 14 shows an example of a wall mounted urinal in which an odor trap can be incorporated;

FIGS. 15-18 show one preferred construction of the preferred embodiment of FIG. 13. FIG. 15 is a bottom view of a top member thereof; FIG. 16 is a perspective side view of a middle member thereof; FIG. 17 is a perspective side view of a bottom member thereof (with upper and middle members represented in part in dotted lines); and FIG. 18 is a perspective side view of a plug-handle member capable of being included in this embodiment.

Detailed Description of the Invention

[0025] FIG. 1 is a mid cross-sectional view of an odor trap 10A of the edge-entry trap configuration of known art as described above, configured as a cylindrical cartridge.

[0026] Odor trap 10A has a main liquid container 14 extending from an outer wall to an inner wall that forms a drain stand pipe 14A defining at its upper edge the overflow level of liquid in the container 14. An overhead cap portion 16 is formed to provide a vertical baffle 16A extending down into container 14 dividing it into an inner discharge compartment and a surrounding entry compartment. A body of residual urine 18 extends up to the overflow level at the top of stand pipe 14A, and in conjunction with the overhead plenum region formed by the cap portion 16, the residual body of urine 18 serves to trap sewer gasses from the external drain line in accordance with plumbing codes.

[0027] A body of oily liquid sealant 20, lighter than water or urine, floating in the entry compartment on top of the trapped body of urine 18, serves to trap odors from the urine 18 from escaping from trap 10A.

[0028] In operation of the urinal, urine from above, near the outer edge separates into droplets that permeate through the layer of sealant 20 and then join the main body of urine 18. As additional urine enters the body of urine 18, it overflows the stand pipe 14A and the overflow portion gravitates down the drain.

[0029] Known oil-sealed odor traps are configured as in FIG. 1 with a vertical baffle 16A. From actual experience, traces of sealant can escape during usage. Such depletion occurs as follows: in a form of turbulence or emulsification during each usage event, despite the inherent buoyancy of the sealant 20 due to its low density and the non-affinity to water/urine, some droplets of sealant, can separate from the main body and get swept downward along with the main flow of urine in the outer chamber. These stray droplets will tend to decelerate due their inherent buoyancy and, depending on downward urine flow velocity and travel depth, some of them may come to rest and then reverse and rise against the flow to return to the main sealant body above, and are thus recovered. However, any droplets that get dragged by the urine flow past the bottom of the baffle 16A, will then accelerate upwardly in the inner compartment 18 due to their buoyancy and will then escape down the drain conduit in stand tube 14A.

[0030] The present invention, operating on a modified form of the basic principle described above and teaching novel internal structure, can be implemented with the same general cylindrical exterior shape as that of the odor trap shown in FIG. 1, and can be made to fit into a cavity receptacle that is part of a urinal system having an entry bowl portion 12A above, leading to tapered upper edges of the outer wall of the main liquid container of odor trap 10A and extending downward around the trap 10A to a reduction portion 12B which connects by regular plumbing attachments to the external drain system.

[0031] FIG. 1A is a simplified schematic representation of the left hand half of the symmetrical configuration of FIG. 1 which is coaxial about a central axis C-C', showing again the relation of sealant 20, urine 18 and a sealant flow path 22 in the urine in the entry compartment. It is evident that in this configuration due to the vertical orientation of baffle 16A, the flow path 22 is predominantly vertical: downward in the outer compartment as shown and upward in the inner chamber, with only relatively small horizontal components around the bottom of baffle 16A and around the top of stand tube 14A. Flow path 22, having sealant 20 overhead, is the only portion of the total flow path where sealant recovery can occur, thus a corresponding parameter can be estimated as indicated by dimension X, representing the effective sealant-recovery horizontal flow path length. In a typical odor trap of the category of FIGS. 1 and 1A, with the main liquid container 14 having an inside radius R as indicated = 5.4 cm and the baffle 16A having an outside radius of 4 cm, the horizontal recovery dimension X is about 0.8 cm, from which we can express the unitless ratio X/R = 14.8% characterizing this particular internal structure.

[0032] The component X labelled in the FIGS. is an approximate average of the horizontal vector components X of the wastewater flow, extending from the middle of the entry opening (e.g. the point of average entry of the wastewater into the sealant) to a furthest point along the flow path (e.g. around the baffle) in which sealant recovery can occur. Although the invention contemplates a value X based on the approximate average, preferably, generally all of the wastewater will follow a flow path having a component X, e.g. any wastewater not following such a flow path would be insubstantial enough to effect the proper functioning of the invention -- such as if extraneous openings were provided allowing a minimal volume flow rate therethrough.

[0033] A vertical vector component Y of the flow path can be approximately defined as the vertical distance from the top of stand pipe 14A to the bottom of baffle 16A. Accordingly, an alternative feature can be based on a ratio X/Y, which can be used to estimate an effective slope of the flow path -- for example, X/Y,< 1 indicating a predominantly vertical flow path and X/Y > 1 indicating a predominantly horizontal flow path.

[0034] This category of odor trap is vulnerable to total loss of sealant if subjected to water-flushing at high pressure, due to the relatively narrow width of the cuter compartment and absence of any sizeable shelter compartment around the entry region to which sealant can be displaced temporarily by the flushing water instead of being forced down the drain.

[0035] FIGS. 2-8 are simplified cross-sectional functional diagrams representing various odor trap configurations illustrating principles of the present invention, which is directed to preservation of sealant. For simplicity, as in FIG. 1A, only half of symmetrical cross-sections are shown, along with a central axis. The shapes shown generally apply to structure that is coaxial about the axis shown, but the invention could be practiced by applying such cross-sections to other, non-coaxial and/or non-symmetrical configurations such as rectangular containers or cylindrical containers with non-coaxial internal structure.

[0036] FIG. 2 is a conceptual diagram illustrating basic principles of the present invention wherein an odor trap 10B is structured in a novel manner: rather than making the baffle vertical as in FIGS. 1 and 1A, at least a portion of the baffle is shaped in a non-vertical manner to cause the liquid flow path to be predominantly horizontal, as a major departure from entirely vertical baffles and consequent predominantly vertical liquid flow that has been universal in known art as described above.

[0037] The baffle in FIG. 2 has a vertical portion 16A, facing the vertical wall of drain riser 14A, and an inclined but substantially horizontal portion 16B sloping up to the cover 16C which has an entry opening 16D at the left. The contour of the bottom portion 14B of the main liquid container 14 is shown for simplicity as forming a flow path of substantially constant depth, however in practice there can be a much greater variation in depth along the flow path.

[0038] From the entry opening 16D at the left, the flow is to the right. The liquid flow path has two recovery portions 22A and 22B as indicated. In the portion 22A, starting at the entry inlet, the flow is horizontal, passing under the main body of sealant 20. Then in portion 22B the flow path slopes downward but remains predominantly horizontal as directed by the sloping baffle portion 16B. The flow path turns abruptly upward at the plane of vertical baffle portion 16A, to overflow riser 14A and then exits down the drain in the same manner as in FIGS. 1 and 1A.

[0039] It is evident that in both flow path portions 22A and 22B the flow path is predominantly horizontal, in distinction from the predominantly vertical flow paths in FIGS. 1 and 1A.

[0040] In FIG. 2 within the path length X indicated, practically all stray sealant droplets migrating upwardly to the top side of the flow path will be recovered and returned to the main body of sealant 20. In flow path portion 22A the body of sealant 20 is directly overhead, and along portion 22B the slope of baffle 16B redirects upwardly-migrating stray sealant back to the main body of sealant 20, as indicated by the curved arrows. Since sealant recovery occurs along both of these portions, the recovery dimension X as shown is the sum of the horizontal components of the two portions.

[0041] The cross-section of FIG. 2 can be applied to a coaxial cylindrical structure having a central axis about the line C-C' and the outer wall of cylindrical container being at D-D', such as the wall 14 as shown. Alternatively, the cross-section of FIG. 2 can be applied in reverse manner to provide a coaxial cylindrical odor trap structure of the central-entry type with a central axis at D-D' and the outer wall of the cylindrical container at C-C'.

[0042] As a further alternative, the cross-section of FIG. 2 can represent that of an enclosure that is other than cylindrical, e.g. rectangular. In addition, the container can alternatively be made with side walls at both D-D' and C-C' such that a non-symmetrical, non-axial, device is formed.

[0043] A coaxial structure based directly on FIG. 2 would tend to be shallower and larger in diameter than cartridges shaped as shown in FIG. 1. As a practical limitation, a minimum liquid depth is required in the trap to meet regulations regarding containment of sewer gas pressure in the drain system: e.g., 2 inches in the United States and 50 mm in Europe. Due to existing urinal space limitations, cylindrical traps are typically limited to a maximum diameter of about 150 mm (5.9") and a maximum height of about 90 mm (3.54"). To function properly in such a compact size, the conceptual example shown in FIG. 2 is preferably reconfigured in shape with the wasted space between the baffle portions 16A, 16B and the cover 16C more preferably being utilized.

[0044] The principles and advantages in sealant retention illustrated in FIG. 2 can be realized in various odor trap configurations according to the present invention, constructed and arranged to meet particular practical requirements, such as shown in the following examples.

[0045] FIG. 3 depicts the structure of an edge-entry odor trap 10C having the baffle configured with a vertical upper portion 16A and a sloped portion 16B as shown, providing a flow path 22 corresponding to horizontal recovery dimension X as shown, extending from an averaged entry point to the extremity of sloped baffle portion 16B.

[0046] In FIGS. 2 and 3, as viable baffle shape variations, the vertical portion 16A could be located anywhere along the sloped portion 16B between the extremes shown in these two FIGS., while keeping the sloped portion 16B as shown: basic functioning and dimension X would be virtually unaffected.

[0047] FIG. 4 depicts an odor trap 10D as a variation of FIG. 3 having baffle 16B sloped in its entirety. The flow path 22 and the dimension X are approximately the same as in FIG. 3.

[0048] FIG. 5 depicts a center-entry odor trap 10E wherein the baffle is configured with a vertical upper portion 16A and a horizontal lower portion 16B flanged outwardly as shown. This creates a folded liquid path having upper portion 22A above and lower portion 22B as shown. Only the upper portion 22A will be effective in returning stray sealant because the baffle 16B is not sloped. Thus, stray sealant in the portion 22B will tend to get swept along to the right and escape to the drain along with the effluent. The horizontal recovery dimension X will be as indicated, derived from the upper flow path portion 22A.

[0049] FIG. 6 depicts an odor trap 10F as a variation of FIG. 5 wherein the lower baffle portion 16B is sloped as shown so as to recapture stray sealant from the lower horizontal flow path 22B. The horizontal recovery dimension x is calculated by adding the upper horizontal flow path 22A to the lower horizontal flow path 22B.

[0050] FIG. 7 depicts an odor trap 10G as a variation of FIG. 6 wherein the sloped flange portion 16B is made to have an oppositely-slope upper surface which serves to prevent accumulation of debris on the flange's upper surface which could otherwise occur in this region in the structure of FIG. 6. Dimension X is virtually the same as in FIG. 6.

[0051] FIG. 8 depicts an odor trap 10H as a reversed version of the foregoing center entry coaxial configurations which achieves a form of predominantly horizontal flow path with a simple vertical baffle 16A surrounded by a drain stand wall 14A' which sets the overflow level. Wall 14A', surrounded by an outer wall extending down from the circumference of the cover 16C, is attached to the circumference of the floor 14B so as to form a simple cylindrical main container pan 14 which can be supported by the surrounding cover 16C or drain housing 12B by radial vanes (not shown). The center entry causes the liquid to spread out radially in a sloped but substantially horizontal flow path 22 leading to the bottom edge of the baffle 16A as shown, corresponding to recovery dimension X as indicated.

[0052] In FIGS. 5-8, a triangular-shaped empty region can be seen in cross-section above the sealant, as formed by the slope of the cover. This triangular region serves an important function as a sealant shelter region into which the sealant tends to be displaced in the event of high-pressure water flushing, instead of being forced down the drain ahead of the flushing water, as could occur with trap structure of known art, such as in FIGS. 1 and 1A, having the conventional vertical baffle 16A and the conventional predominantly vertical flow paths.

[0053] FIG. 9 is a three-dimensional view of a cylindrical odor trap cartridge 10I with center entry 16D in accordance with a preferred embodiment of the present invention. The upper surface slopes downward in a shallow inverted cone toward the center where the entry opening 16D is fitted with a filter screen or a fine perforation pattern formed in the cover material.

[0054] The enclosure can be, for example, dimensioned about 4 1/2"(11.4 cm) in diameter and 2 3/4' (7.0 cm) in height. As noted, due to existing industry limitations, the size of the trap is to be limited. For example, the diameter of the trap is preferably between about 2 to 2 ½ inches. It is preferably molded from polyethylene, or from another suitable plastic material such as polypropylene, ABS or polystyrene, to provide a smooth stain-resistant surface. The material can also include a fiberglass reinforced polyester. Other suitable materials can also be utilized. Typically, the main container 14 and cap/partition part 16 are molded as separate parts and then bonded together to form an integral enclosure, since access to the interior is not normally required. The entry configuration of trap 10I makes it feasible to seal the entry opening 16D (with the bottom exit opening, not visible in FIG. 9, sealed in a similar or other manner) for shipment as a cartridge already charged with sealant, ready for deployment. For example, to seal the opening 16D, a sticker can be attached thereto, such sticker can further include labelling, etc., such as installation instructions and product labelling.

[0055] FIG. 10 is a three-dimensional cutaway view of a center-entry cylindrical odor trap 10J having a non-coaxial interior configuration, shown without liquid for clarity. The baffle has two flat portions: vertical portion 16A extending downward from the upper surface offset to the right of entry opening 16D. At the bottom of vertical baffle portion 16A, a horizontal portion 16B extends fully to the left hand wall of odor trap 10J. A round opening 16E, about the same size as opening 16D, is configured in a horizontal baffle portion 16B at the edge furthest from vertical baffle portion 16A. Opening 16E leads into a lower compartment which is configured with a flat floor 14B of which a portion is extended upwardly at the right hand side to form tubular drain stand 14C whose top edge defines the overflow level of the container as in the FIGS. described above. The two liquid flow paths 22A and 22B are shown and the corresponding recovery path dimension X is indicated as derived from path 22A.

[0056] FIG. 11 depicts an odor trap 10K which is a variation having a baffle configured as in FIG. 10 but wherein the drain riser 14D is here configured as a flat vertical riser wall 14D attached integrally to floor 14B and to the interior wall of the main enclosure 14 of odor trap 10L, preferably molded together in one piece.

[0057] FIG. 12 is a central cross-section depicting an odor trap that represents an important variation applicable to both FIG. 10 and FIG. 11. The horizontal baffle portion 16B is sloped in a manner to recover stray sealant and return it to the main body of sealant 10. The resultant horizontal recovery dimension X is much longer than in FIGS. 10 and 11 due to the additional recovery provided by the sloped baffle portion 16B.

[0058] It is seen that the cross-sections of FIGS. 10 and 11 generally resemble that of FIG. 5, and the cross-section of FIG. 12 generally resembles that of FIG. 6. However, preferred constructions according to FIGS. 5 and 6 as shown imply fully coaxial internal and external configuration centered on axis C-C' whereas the internal structure in FIGS. 10-12 is clearly non-coaxial with the outlet offset rather than centered and the baffles flat rather than cylindrical.

[0059] The relative sealant recovery effectiveness of the above configurations as approximated by the recovery-effective length of the horizontal flow paths X relative to container radius R can be compared in the following estimated table. The following Table 1 lists examples of estimated values which can be achieved for X/R in the illustrated embodiments, the illustrated embodiments not being limited thereto:

TABLE 1

FIG.	X/R
1, 1A	15%
2	76%
3, 4, 5	50%
6, 7	105%
8	56%
10, 11	71%
12	165%

[0060] Alternatively, the relative sealant recovery effectiveness of the above configurations, as a few examples, can be expressed as a function of the flow path slope X/Y. The following Table 2 lists estimated examples of values which can be achieved for X/Y in the illustrated embodiments, the illustrated embodiments not being limited thereto.

TABLE 2

FIG.	X/Y
1, 1A	0.12
2	4.64
3,4	3.50
5	5.50
6	5.75
7	8.60
8	3.67
10, 11	3.08
12	5.82

[0061] According to the preferred embodiments of the present invention, the inlet and outlet locations and the baffle configuration, etc., result in a predominantly horizontal flow. For example, in some preferred embodiments, the present invention yields preferred values of X/R > 30%, as distinguished, for example, from predominantly vertical flow of known art in the above table. As seen in Table 1, the present invention can even yield values greater than 50%, allowing for a wide margin above the 15% estimated for the noted prior art. As another example, the present invention can yield preferred values of X/Y of greater than 1.0, while the above-noted estimate of the noted prior art achieves a value substantially less than 1.0. Although clearly less preferred, it is contemplated that values less than the preferred examples of X/R and/or X/Y can, in some cases, be used according to principles of the invention.

[0062] It is recognized that as a one-dimensional parameter such as X/R is merely a first approximation of effectiveness: a more refined two-dimensional parameter could take into account the effective horizontal recovery area located above the flow path. An even more refined three-dimensional parameter could take into account fluid viscosities, width, depth and length and resulting flow velocities at various incremental points in the flow paths.

[0063] The relative effectiveness indicated by the above tables apply to normal operation and does not necessarily include the additional improvement provided by the present invention in protection against catastrophic loss of sealant under the condition of high pressure water flushing as described above. In this regard, according to another aspect of the invention, a shelter region is provided for the sealant, such a shelter region can be provided in any of the embodiments of the invention. The configurations of the embodiments of, for example, FIGS. 10-12 include entry compartments with shelter regions (e.g., T shown in FIG. 12) wherein high-pressure flushing water tends to take a direct path from entry opening 16D to baffle opening 16E while parting much of the sealant and temporarily pushing it into the shelter regions at both sides. Among other things, the angled top wall and the wide entry compartment helps provide such shelter regions. The shelter region is preferably formed by an airspace above the normal sealant level, such as shown within T in FIG. 12. In order to allow the sealant to quickly enter the shelter region, the device can include one or more air vents to allow air within the shelter region to vent outside thereof. For example, the embodiment shown in FIG. 12 includes at least one air vent 16F at an upper end of the trap. The air vent 16F is preferably sized to allow air to pass therethrough while substantially preventing fluid flow therethrough, and preferably has a diameter of about 1-2mm. As shown, the air vent is preferably in the top wall of the device. In this manner, in the event the any sealant is forced through the air vent, the sealant can be redirected along the upper surface and into the upper opening 16D so as to return to the body of sealant.

[0064] FIG. 13 shows another preferred embodiment of the invention. The device shown in FIG. 13 employs a number of features which are similar to certain features shown in FIGS. 10-12. FIG. 13 is a three-dimensional cutaway view of an odor trap 10M having a non-coaxial interior configuration. The baffle has a generally vertical portion 16A extending downward from the upper surface, offset to the right of entry opening 16D, and a horizontal portion 16B extending fully to the left hand wall of odor trap 10M at the bottom of vertical baffle portion 16A. The horizontal baffle extends only partially across the trap so as to leave an opening 16E at the edge furthest from vertical baffle portion 16A. The opening 16E leads into a lower compartment which is configured with a floor 14B. A tubular drain stand 14C is provided which extends upward at the right hand side of the floor 14B. The top edge of the drain stand 14C defines the overflow level of the container. The two liquid flow paths 22A and 22B shown provide a corresponding recovery path dimension X similar to that shown in FIG. 12 -- e.g., the sum X1 + X2 from the paths 22A and 22B, respectively. As shown in FIG. 13, a body of wastewater 18 has a sealant layer 18 buoyantly floating thereon. The wastewater 18 follows the flow path a) 22I into the entry opening 16D, b) 22A above the baffle, c) 22B below the baffle 16B, d) 22C up and over the top edge of the drainstand 14C, and e) 22D down the drainstand 14C.

[0065] FIGS. 15-18 show one preferred construction of the embodiment shown in FIG. 13. This preferred construction includes a top member 150 (FIG. 15), a middle member 160 (FIG. 16), a bottom member 170 (FIG. 17), and a plug member 180 (FIG. 18). The top member 150 includes a generally cylindrical perimeter wall 151, a downwardly inclined top wall 152, and an entry opening 153 at the center of the top wall. The top wall 152 is inclined in a manner like that in FIG. 13. As shown, the entry opening preferably includes three holes 154 in the center area of the top wall. The top wall also preferably includes two sealing ridges 155 for receiving and sealing the baffle 165 (discussed below).

[0066] The middle member 160 includes a perimeter wall 161 and a baffle having a generally vertical portion 165 and an upwardly inclined portion 166. The portion 166 has a generally straight upper edge 167 providing a fluid passage 168 around the baffle.

[0067] The bottom member 170 includes a perimeter wall 171, a bottom wall 172, and a upwardly extending drain stand 173. The drain stand preferably is a cylindrical tube extending above the wall 171 with an upper opening 175 and a lower opening 176. The lower edge of the bottom member can, for example, as shown include a tapered wall 174.

[0068] The device is assembled with the middle member fitted such that the perimeter wall 161 snugly fits within the perimeter wall 151 and the baffle portion 165 snugly fits between the ridges 155. The wall 151 only extends down over part of the height of the wall 161. The lower member 170 fits with the drain stand 173 within the area to the right of the baffle portion 165 and the lower portion of the cylindrical wall 161 snugly fitted within the cylindrical wall 171. As a result, a sealed container can be constructed having separately isolated entry and discharge compartments.

[0069] FIG. 18 shows a plug-handle member 180 which can be included in this latter embodiment. The plug-handle member 180 preferably includes a tubular member 181, handle projections 182, and L-shaped projections 183 at the upper wall 184. The plug is preferably shaped and sized so as to snugly fit within the drain stand 173. With this construction, the odor trap can be transported with a body of sealant within the assembled structure, if a plug 180 is inserted in the opening 176 and a seal (such as an adhesive backed label) is placed over the opening 153. As shown, the L-shaped projections are sized and shaped to fit within the holes 154 so that the assembled device can be carried by simply inserting the projections into the holes 154 and rotating the plug 180 in the direction L, FIG. 18, so that the L-shaped projections engage under the top wall 152. Thus, the member 180 provide a tool that can be used to seal a new, unused, unit and to remove a dirty, wastewater filled, unit. Although the plug and handle functions are preferably combined into the single tool 180, it is contemplated that separate devices embodying these features can be included and/or either the plug or handle can be eliminated depending on the desired handling.

[0070] The sealant 20 is preferably a biodegradable oily liquid. A preferred composition of liquid 20 comprises an aliphatic alcohol containing 9-11 carbons in the chemical chain, wherein the specific gravity is 0.84 at 68 degrees Fahrenheit. Since the operation of the urinal is based on the differential between the specific gravity of the oily liquid and that of urine, typically near 1.0, the specific gravity of the oily liquid should be made as low as possible, preferably not exceeding 0.9 and, more preferably, well under 0.9. The sealant preferably 20 is chosen to have a very low affinity to water such that sealant and the urine strongly repel each other physically so that there is no chemical or other interaction apart from a purely physical separation which allows urine/water from above to divide finely and permeate downwardly through the sealant layer. The sealant 20 is preferably colored, e.g. blue, for maintenance and identification purposes.

[0071] FIG. 14 shows one example of type of urinal into which the various odor traps, shown generally as 10, can be located. The illustrated urinal 140 being a wall mounted unit attached above a floor surface (not shown). The urinal shown is for illustrative purposes only; a trap of the present invention can be used in any type of urinal. More notably, the utility of the invention, while directed in some aspects to waterless urinals as illustrated above, is not restricted thereto. The present odor trap is applicable to other drained surfaces and the like. For example, since the preferred sealant utilized is considerably more stable than water with regard to evaporation, the present invention has widespread utility as floor drains, solving, for example, problems of sewer gas release from conventional S type floor drains resulting from, for example, total seal failure due to evaporation of the residual water and lack of replenishment thereof, particularly in hot, dry climates.

[0072] The invention may be embodied and practiced in other specific forms without departing from the spirit and essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description. Furthermore, all variations, substitutions and changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. An odor trap apparatus for conveyance of wastewater, comprising:

a main liquid container (14) having at least one entry opening (16D) through which wastewater enters into said container;

a baffle (16A, 16B) in said container, dividing said container into an entry compartment receiving the wastewater through said at least one top opening, and a discharge compartment receiving wastewater from said entry compartment;

a quantity of liquid sealant (20) having a density lower than that of the wastewater contained in said entry compartment and being adapted to form a sealant layer floating on the body of the wastewater;

a passage point at an end of said baffle distant from said at least one entry opening (16D), around which the wastewater passes traveling from the entry compartment to the discharge compartment such that prior to reaching said passage point, liquid sealant (20) that is drawn beneath the sealant layer by the wastewater and then is buoyed upwards can rise back to said sealant layer, and that after passing said passage point, liquid sealant (20) cannot rise back to said sealant layer;

a liquid flow path (22A, 22B) defined by the baffle, along which said wastewater travels through the entry compartment and to the discharge compartment; and

an outlet communicating said discharge compartment with an external drain;

wherein the baffle has one or more non-vertical segments (16B), and the length of the liquid flow path (22A, 22B) along said baffle (16A, 16B) is sufficient that a substantial portion of any liquid sealant drawn beneath the sealant layer by the wastewater rises back to the sealant layer.

2. The odor trap apparatus of claim 1, wherein a flow path distance (x), measured from said at least one entry opening (16D) and extending along the liquid flow path (22A, 22B) to said passage point, is larger than a vertical distance (y) measured from said at least one entry opening to the passage point.

3. The odor trap apparatus of claims 1 or 2, wherein the length of said liquid flow path (22A, 22B) along said one or more non-vertical segments (16B) is sufficient to at least minimize turbulence in said sealant layer.

4. A method for conserving the quantity of liquid sealant in an odor trap apparatus for conveyance of wastewater to an external drain, said apparatus comprising a container having at least one opening entry for receiving the wastewater therein, a baffle in said container dividing said container into an entry compartment into which the wastewater is received through said at least one opening entry and a discharge compartment communicating with and defining therewith a wastewater fluid flow path in the compartments which passes above and beneath the baffle and about an end thereof, an outlet communicating the discharge compartment with the external drain and a quantity of liquid sealant having a density lower than said wastewater in said entry compartment forming a sealant layer above the wastewater in the entry compartment,
the method for conserving the quantity of the liquid sealant comprising the step of:

disposing a portion of the baffle under the sealant layer, for distance between the opening entry to the baffle end which allows sufficient non-vertical movement of the wastewater along the baffle, wherein a substantial portion of any liquid sealant drawn beneath the sealant layer by the wastewater rises back to the sealant layer.

5. The method of claim 4, wherein the step of disposing a portion of the baffle under the sealant further comprises the step of lengthening the flow path by extending the baffle for a distance beneath the sealant sufficient to minimize turbulence in the sealant from the wastewater neighboring the baffle end.

6. A method for conserving the quantity of liquid sealant in an odor trap apparatus for conveyance of wastewater from an entry to an external drain along a flow path that passes through a quantity of liquid odor sealant floating on the wastewater, the method comprising the steps of:

disposing a baffle under the sealant for lengthening the flow path above and beneath the baffle and about an end thereof; and

extending the baffle, for a distance between the entry and the baffle end, sufficient to permit the wastewater to pass substantially fully through the sealant layer, while permitting a substantial portion of any liquid sealant drawn beneath the sealant layer by the wastewater to rise back to the sealant layer.

7. The method of claims 5 or 6, further comprising the steps of orienting the baffle, for a distance between the entry and the baffle end so as to minimize turbulence in the sealant resulting from the wastewater passing therethrough.

8. An odor trap system including an odor trap apparatus for placement in and removal from a drain device, such as waterless urinals and anti-evaporation floor drains, and for conducting wastewater to an external drain, comprising:

the odor trap apparatus of any one of the claims 1 to 3,

wherein the opening entry in the top cover of the container includes a plurality of openings through which the wastewater passes into said container; and

wherein the system further comprises a tool having at least one hook-like projection for engagement with said openings for enabling insertion and removal of said container into and from the drain device.

9. An odor trap system according to claim 8, wherein said at least one hook-like projection is provided with at least one hook for engagement with the underside of said top cover adjacent said openings.

10. An odor trap system according to claim 8 or 9, wherein said at least one hook-like projection comprises at least one vertical portion and at least one horizontal portion.

11. A method for inserting and removing an odor trap apparatus adapted for placement in a drain device, such as waterless urinals and anti-evaporation floor drains, for conducting wastewater to an external drain, the apparatus including (a) a container having a top cover provided with an opening entry portion therein for receipt of the wastewater and for conducting the wastewater through a flow path which includes a quantity of low-density liquid adapted to form a sealant layer, and to the external drain, and (b) the opening entry having a plurality of openings through which the wastewater passes into the container,
the method for inserting and removing comprising the steps of:

utilizing a tool having at least one hook-like projection; and

engaging the projections into the openings of the entry opening.

12. A method according to claim 11, wherein said engaging step includes the step of providing the hook-like projections with at least one generally horizontal portion and engaging the generally horizontal portion of the projections with the underside of the top cover adjacent the openings.

Drawing