[0001] The present invention relates to an assembly for the regulation of the quantity of
regeneration salt to be taken from the salt tank of the decalcifier of a washing machine.
[0002] A decalcifier for washing machines of the known type comprises a tank for the ion
exchanging resins for softening the washing water and a tank for the salt for regenerating
the ion exchanging resins, communicating through the opening of a regeneration solenoid
valve.
[0003] So as to regenerate the resins the salt is removed at opening of the regeneration
solenoid valve by regeneration water taken from the water supplying the washing tub
and accumulated in a special dispenser receptacle.
[0004] Given that the hardness of the washing water varies according to the water supply
system from which it is taken, it is necessary to be able to regulate the quantity
of regeneration salt to be removed in order to avoid unnecessary waste.
[0005] According to a known system for the regulation of the removal of salt from the decalcifier,
the regeneration water is distributed between two or more conduits inside the salt
tank and outflowing at a predetermined distance from the inlet section of the resins
tank, so that for greater distances the regeneration water succeeds in removing increasing
quantities of salt.
[0006] According to another system traditionally adopted, the removal of the salt can be
controlled by sending only a part of the regeneration water for removal from the salt
tank, while the remaining part is channelled directly towards the resins tank and
is used for diluting the brine removed from the salt tank.
[0007] In both cases the regeneration water is distributed via a distribution part formed
by a small vertical rotating rod whose lower shaped end forms on the bottom of the
salt tank a gate valve which intercepts and conveys the regeneration water towards
the conduit selected.
[0008] For the selection of a conduit the upper end of the small rod, situated in the area
enclosed by the salt filler, is formed by an indicator plate provided with a notch
for inserting the tip of a screwdriver or the like, capable of orientating the indicator
plate itself in the various angular positions corresponding to the opening of each
of the exit ways of the gate valve.
[0009] A disadvantage which occurs in traditional systems consists in the fact that the
diameter of the rod must by very limited in order not to obstruct the operation of
filling the salt through the relative filler.
[0010] The indicator plate, arranged horizontally, must also necessarily be small, therefore
becoming accessible with difficulty for the operations both of simple reading and
selection by the user.
[0011] The need for reduced transverse overall dimensions for the distribution part does
not allow a free choice of the dimension and number of outflow apertures of the gate
valve, reducing versatility of the distribution system.
[0012] Since the gate valve is immersed in the brine on the base of the salt tank, it is
usually necessary to provide the distribution part with a small rubber part which
creates a perfect seal between the gate valve and the conduits supplied thereby.
[0013] The rubber seal part increases the complexity of the system and has a significant
effect on its overall cost as regards the distribution part.
[0014] Finally, in traditional systems of the type described above, the welding of the two
half parts forming the decalcifier is in general also used to restrain the rod in
the correct position inside the salt tank.
[0015] This complicates control of the operation of welding of the decalcifier which has
to be performed with extreme precision if correct operation of the distribution part
is not to be jeopardised.
[0016] The object of the present invention is that of providing an assembly for the regulation
of the quantity of regeneration salt to be taken from the salt tank of the decalcifier
of a washing machine which avoids the disadvantages suffered in a traditional system.
[0017] In particular one object of the present invention is that of providing an assembly
for regulation of the quantity of regeneration salt to be taken from the salt tank
of the decalcifier of a washing machine which is easily accessible and visible from
outside the decalcifier without obstructing loading of the salt from the filler of
the relative tank.
[0018] Another object of the present invention is that of providing an assembly for the
regulation of the quantity of regeneration salt to be removed from the salt tank of
the decalcifier of a washing machine formed by a small number of parts so as to be
simple and inexpensive.
[0019] Yet another object of the present invention is that of providing an assembly for
the regulation of the quantity of regeneration salt to be removed from the salt tank
of the decalcifier of a washing machine which can be adapted with flexibility to various
working conditions.
[0020] Another object again of the present invention is that of providing an assembly for
the regulation of the quantity of regeneration salt to be removed from the salt tank
of the decalcifier of a washing machine which can be positioned in the decalcifier
with care and without complicating assembling of the same decalcifier.
[0021] These objects are achieved by providing an assembly for the regulation of the quantity
of regeneration salt to be removed via regeneration water from the salt tank of the
decalcifier of a washing machine for the regeneration of the ion exchanging resins
contained in the resins tank of the decalcifier, comprising a part for the distribution
of regeneration water between at least a first and a second conduit of the decalcifier,
of which conduits at least one leads to removal of the regeneration salt, said distribution
part comprising a rotating gate valve capable of adjusting the apertures for outflow
of said regeneration water towards said conduits, a rod for driving rotation of the
gate valve, and a selector of the required distribution of regeneration water attached
to the end of the drive rod opposite the gate valve, characterised in that said distribution
part is arranged horizontally in the salt tank with the rod provided at the internal
side of the upper covering wall of the salt tank and with the selector provided at
the internal side wall of the salt tank filler.
[0022] The horizontal orientation of the distribution part advantageously allows the possibility
of placing the drive rod of the gate valve outside of the space of the salt tank underneath
the relative filler in such a way that there are no obstacles to loading the salt.
[0023] The drive rod and the gate valve which can be actuated thereby can consequently be
dimensioned as required in such a way as to achieve regulation which can be set with
versatility for several conditions of salt removal.
[0024] The selector is preferably formed by a wheel coaxial to the rod so as to have a large
diameter without penalising the passage of the salt from the filler towards the base
of the relative tank.
[0025] The selection wheel is thus fully visible and provides a clearly legible indication
from the outside of the decalcifier to the user who has removed the plug from the
filler of the salt tank, at the same time offering the further advantage of being
able to be actuated directly by hand.
[0026] The distribution part is inserted in the upper part of the salt tank, where the regeneration
water still has such a head as to guide it vertically downwards through the gate valve
without axial overflows, and therefore makes the use of a rubber seal part on the
body of the gate valve superfluous.
[0027] By saving the rubber part a reduction in the complexity and cost of the distribution
part is achieved.
[0028] Other advantages of the present invention will be made clearer on reading the following
description of a preferred embodiment which refers to the accompanying drawings in
which:
Fig. 1 shows schematically the decalcifier-regeneration dispenser receptacle assembly
of a washing machine;
Fig. 2 shows a side elevation enlargement of the distribution part of the present
invention;
Fig. 3 is a section of the distribution part seen from line 3-3 of Fig. 2;
Fig. 4 is a section of the distribution part seen from line 4-4 of Fig. 2;
Fig. 5 is a sectioned and enlarged side elevation view of the upper half part of the
tank comprising the distribution part of the present invention; and
Fig. 6 is a sectioned and enlarged front view of only the seat for housing the distribution
part of the present invention.
[0029] In Fig. 1 the decalcifier 1 of a washing machine is composed of an ions exchanging
resins tank 3 and of a salt tank 5 communicating via a regeneration solenoid valve
(not shown).
[0030] On the decalcifier 1 a regeneration dispenser receptacle 11 is positioned whose base
has a special mouth 2 for the inflow of water coming from an external water supply
source. Part of this water is intended to be sent directly towards the resins tank
3 so as to be softened before being fed into the washing tub, while the remaining
part is accumulated temporarily in a special compartment of the dispenser receptacle
11 in such a way as to be able to be fed, following energisation of the regeneration
solenoid valve, towards the salt tank 5 for removal of the regeneration salt.
[0031] The resins tank 3 has, on the upper covering part, a mouth 7 which can be coupled
to a pin 7', mounted on the base of the regeneration dispenser receptacle 11, wherefrom
it receives the washing water to be softened, and on the lower part a mouth (not shown)
which feeds the softened washing water into the washing tub.
[0032] The salt tank 5 has, on the upper covering part, a mouth 9 which can be coupled to
a pin 9', mounted on the base of the regeneration dispenser receptacle 11, wherefrom
it receives the regeneration water temporarily accumulated in the dispenser receptacle
11 itself, and a filler 13 fitted with a plug 15 for loading the salt.
[0033] As can be seen in particular from Fig. 5, for the regulation of the quantity of salt
to be removed for regeneration of the resins a part 17 is provided which is attached
at the upper covering wall of the salt tank 5 and which distributes the regeneration
water between two conduits whose inlet section alone is shown in Fig. 5 with the reference
numerals 19 and 21 respectively.
[0034] In the case in question the conduit 19 carries the regeneration water which traverses
it for removal of the salt contained in the salt tank 5, while the other conduit 21
returns the regeneration water which traverses it to the resins tank 3 so as to dilute
the brine removed by the regeneration water which has traversed the conduit 19.
[0035] Alternatively it can be foreseen that both conduits carry the regeneration water
which traverses them for removal of the salt, and in this case the point of outflow
of the two conduits on the base of the salt tank 5 should occur at a distance different
from the inlet section of the resins tank 3.
[0036] The distribution part 17, as is also clear from the remaining figures, is formed
by a rotating gate valve 23 which intercepts the regeneration water coming from the
mouth 9 to then distribute it to the conduits 19 and 21, by a rod 25 with circular
plan for driving the gate valve 23 and by a selector 27 of actuation of the drive
rod 25.
[0037] The body of the rod 25 is formed by axial ribs 26 capable of opposing the deforming
stresses of a thermal origin which intervene during the process of moulding, while
at the rear base of the rod 25 a first solid disk 50 is formed and wherefrom the gate
valve 23 extends axially and is in turn formed by two baffles 29 and 31 orientated
perpendicularly one in relation to the other and joined by the interposition of a
second disk 33 of identical shape and size to the first disk 50.
[0038] The first disk 50 is centred on the rear base of the rod 25 and in relation thereto
has a slightly larger diameter.
[0039] The first baffle 29 projects axially from a section of the first disk 50 formed by
imagining intersecting said disk 50 with two parallel planes perpendicular thereto,
one of which planes passes from a diameter thereof.
[0040] Similarly the second baffle 31 projects axially from a section of the second disk
33 formed by imagining intersecting said disk 33 with two parallel planes perpendicular
thereto, one of which planes passes from a diameter thereof.
[0041] The two disks 33 and 50 have the main task of preventing the regeneration water which
traverses the gate valve 23 vertically from succeeding in overflowing axially.
[0042] Perpendicularly to the lateral edge of each baffle 29 and 31 respectively a slot
35 and 37 respectively is formed which, as we will see, forms a section for controlled
passage of the regeneration water.
[0043] The selector 27 is formed by a selection wheel 39 mounted coaxially on the other
end of the rod 25.
[0044] Along a circumference of the body of the selection wheel 39 an arched track 41 is
formed, having an angular opening of 90°.
[0045] The track 41 passes through the thickness of the wheel 39 and its radially external
edge forms four notches 43, angularly equidistant, to each of which a numerical impression
45, in a diametrically opposed point of the wheel 39, corresponds.
[0046] Finally the external edge of the wheel 39, in the sections between two successive
numerical impressions 45, is knurled.
[0047] The distribution part 17 is inserted in a special seat formed on the internal side
of the upper covering wall of the salt tank 5.
[0048] The distribution part 17 is supported by a U-shaped bracket 59 attached vertically
near the internal side wall of the salt filler 13 so as to support, with its internal
arched part 61, the front end of the rod 25, and by a seat 47 for engaging the gate
valve 23 co-operating with the bracket 59 so as to support the distribution part 17
in a horizontal position.
[0049] Given that the selector lies in a vertical plane, the wheel can be provided with
a large diameter, 5 cm here, without obstructing loading of the salt and at the same
time being accessible and fully visible from outside the salt tank 5.
[0050] The engaging seat 47, also prolonging from the internal side of the upper wall of
the salt tank 5, comprises an upper wall 49, a front wall 51 and a lower wall 53.
[0051] The seat 47 is shaped internally in such a way as to allow axial engaging and support
during rotation of the gate valve 23 and therefore has a circular front aperture with
diameter equal to the diameter of the disks 33 and 50.
[0052] The external side of the upper wall 49 opens upwards so as to form the mouth 9 for
feeding the regeneration water to the gate valve 23, while in the lower wall 53 two
openings 55 and 57 respectively, vertically aligned with a corresponding interception
element 29 and 31 respectively, are capable of receiving the regeneration water from
the outflow apertures of the gate valve 23 in such a way as to feed the inlet sections
of the conduits 19 and 21 respectively.
[0053] The front wall 51 forms instead a striking surface for the rear base of the second
baffle 31 of the gate valve 23.
[0054] In order to prevent the distribution part 17 from sliding axially in relation to
the bracket 59 and to the seat 47, the front surface of the arched part 61 of the
bracket 59 is provided with an element which can be engaged with the distribution
part 17 itself.
[0055] In particularly a small tooth 63 is thus provided which can be snap-inserted in the
track 41 of the selection wheel 27.
[0056] The selection wheel 27 is thus blocked in the groove 67 defined by the small tooth
63 and the axial translation of the distribution part 17 is prevented.
[0057] The rotation of the distribution part 17 is however permitted by the sliding of the
small tooth 63 along the track 41.
[0058] The small tooth 63 also serves to indicate the obtaining of a selection set by the
user, achieved when it reaches one of the angular positions of the track 41 occupied
by the notches 43.
[0059] Advantageously the distribution part 17 is already supported in the correct working
position by the upper cover of the decalcifier before the two half parts of the decalcifier
are thermally welded one to the other. Thermal welding of the decalcifier does not
play an active role in positioning of the distribution part 17 and can therefore be
performed in an extremely random manner.
[0060] Operation of the assembly for the regulation of the quantity of regeneration salt
to be removed from the decalcifier in accordance with the present invention can be
inferred clearly from the accompanying drawings, and involves manual setting by the
user by means of the wheel 39 for selection of the required operating condition.
[0061] When a finger of the user acts on a knurled edge of the selector 27, the selection
wheel 39 drives the drive rod 25 which in turn rotates the gate valve 23 supported
rotatingly in its engaging seat 47, while the small tooth 63 traverses the track 41
until it stops on the notch 43 corresponding to the numerical impression of the required
selection.
[0062] The operating conditions permitted in the present preferred embodiment are four.
[0063] By setting the selection wheel 39 at the numerical value "1", the baffle 29 is in
a horizontal position while the baffle 31 is in a vertical position. On opening of
the regeneration solenoid valve the regeneration water which, from the mouth 9, enters
the salt tank 5 and finds the baffle 31 in the position which allows maximum outflow
of water towards the underlying conduit 21, while the baffle 29 completely blocks
the passage of the regeneration water towards the underlying conduit 19, with the
exception of the slot 35 which allows a controlled passage of regeneration water.
[0064] The rate of flow of regeneration water through the controlled passage is defined
with extreme precision by the dimensions of the slot. By way of an example, in the
present invention, the controlled passage has an area of 4.5 mm
2 compared to an area of 100 mm
2 approximately of the relative baffles 19 and 21.
[0065] This setting of the selector 39 is very suitable for the case of regeneration of
resins for very low hardness of the washing water, given that it performs minimum
withdrawal of salt from the salt tank 5, diverting most of the regeneration water
towards the resins tank 3 for the dilution of the salt removed from the salt tank
5.
[0066] The opposite situation occurs when the selection wheel is rotated through 90° in
relation to the previous setting, moving onto the numerical value "4". In this case
the baffle 29 is in a vertical position while the baffle 31 is in a horizontal position.
On opening of the regeneration solenoid valve the regeneration water which, from the
mouth 9, enters the salt tank 5 and finds the baffle 29 in the position which allows
maximum outflow of water towards the underlying conduit 19, while the baffle 31 blocks
completely the passage of the regeneration water towards the underlying conduit 21,
with the exception of the slot 37 which allows controlled passage of regeneration
water.
[0067] This setting of the selector 39 is very suitable for the case of regeneration of
resins for very high hardness of the washing water, given that it performs maximum
withdrawal of salt from the salt tank 5, diverting the minimum part of regeneration
water towards the resins tank 3 for dilution of the salt removed from the salt tank
5.
[0068] The settings "2" and "3" of the selection wheel 39 refer to an intermediate operating
condition between the two now shown for regeneration with average hardness values
of the washing water. In this case the slant of the two baffles 29 and 31 regulates
the amplitude of the passage apertures of the gate valve 23 in such a way that at
setting "2" a greater quantity of regeneration water reaches the conduit 21, and at
setting "3" a greater quantity of regeneration water reaches the conduit 19.
[0069] Clearly the present invention may undergo various changes without thereby departing
from the general principle claimed.
[0070] In particular the distribution part, due to the very fact of being positioned in
such a way as not to interfere substantially with the salt tank filler, can provide
a gate valve formed by a higher number of interception elements than that illustrated
hitherto for feeding a corresponding higher number of conduits of the decalcifier
and obtaining distribution of regeneration water which is even more flexibly adaptable
to the various working conditions.
1. An assembly for the regulation of the quantity of regeneration salt to be removed
by means of regeneration water from the salt tank (5) of the decalcifier (1) of a
washing machine for the regeneration of the ions exchanging resins contained in the
resins tank (3) of the decalcifier (1), comprising a part (17) for the distribution
of the regeneration water between a first (19) and at least a second (21) conduit
of the decalcifier (1), of which conduits (19, 21) at least one (19) leads to withdrawal
of the regeneration salt, said distribution part (17) comprising a rotating gate valve
(23) capable of adjusting the apertures of outflow of said regeneration water towards
said conduits (19, 21), and a rod (25) for driving rotation of the gate valve (23),
said gate valve (23) extending axially from one end of said drive rod (25), and a
selector (27) for setting the required distribution of regeneration water attached
to the other end of the drive rod (25), characterised in that said distribution part
(17) is arranged horizontally in the salt tank (5) with the rod (25) provided at the
internal side of the upper covering wall of the salt tank (5) and with the selector
(27) provided at the internal side wall of the salt tank filler (13).
2. An assembly according to claim 1, characterised in that said selector (27) is in the
form of a selection wheel (39) mounted coaxially to the drive rod (25).
3. An assembly according to any one of the previous claims, characterised in that said
gate valve (23) comprises in axial succession a first (29) and respectively at least
a second (31) element for interception of the regeneration water associated with said
first (19) and respectively at least a second (21) conduit of the decalcifier (1)
and rotating around the axis of the rod (25) with a predetermined angle one in relation
to the other.
4. An assembly according to the previous claim, characterised in that adjacent interception
elements (29, 31) are in the form of flat baffles (29, 31) joined by the interposition
of a corresponding separation element (50, 33) in such a way as to prevent the regeneration
water from overflowing axially from one to the other.
5. An assembly according to any one of the previous claims, characterised in that said
rod (25) has a circular plan and is formed by axial ribs (26) capable of opposing
the deforming stresses of a thermal origin which intervene during the process of moulding
of the rod (25).
6. An assembly according to the previous claim, characterised in that the rear base of
the rod (25) and the interception element (29) adjacent thereto are joined with the
interposition of a corresponding element of separation (50) in such a way as to prevent
the regeneration water from overflowing axially from the gate valve (23) to the rod
(25).
7. An assembly according to any one of claims 4 to 6, characterised in that each of said
separation elements (50, 33) has the shape of a solid disk with a diameter no smaller
than the diameter of the rod (25) and coaxial to the rod (25), while each of said
interception baffles (29, 31) projects axially from a section of said disk (50, 33)
formed by intersecting said disk (50, 33) with two parallel planes perpendicular thereto,
one of which passing through one of its diameters.
8. An assembly according to any one of claims 4 to 7, characterised in that said first
and at least a second interception element (29, 31) are orientated perpendicularly
one in relation to the other.
9. An assembly according to any one of claims 4 to 8, characterised in that an opening
is provided through the thickness of each of said interception elements (29, 31) in
such a way as to allow controlled passage of the regeneration water.
10. An assembly according to the previous claim, characterised in that said opening has
the shape of a slot (35, 37) formed perpendicularly to the side edge of the interception
element.
11. An assembly according to any one of the previous claims, wherein the salt tank (5)
comprises a filler (13) for loading the salt and a mouth for feeding the regeneration
water, characterised in that it provides first means of supporting the distribution
part (17) on the internal side of the upper covering wall of the salt tank (5) vertically
aligned below the mouth for feeding regeneration water, and second means for supporting
the distribution part (17) on the internal wall of the filler (13) of the salt tank
(5).
12. An assembly according to the previous claim, characterised in that said first means
comprise a vertical U-shaped bracket (59) attached cantilevered to the internal wall
of the filler (13) of the salt tank (5) in such a way as to support with its arched
part the end of the rod (25) on the side of the selector (27).
13. An assembly according to any claim 11 and 12, characterised in that said second support
means are in the form of a seat (47) for axial engaging of the gate valve (23).
14. An assembly according to the previous claim, characterised in that said axial engaging
seat (47) defines internally a circular engaging area having a diameter equal to the
diameter of said separation elements (50, 33).
15. An assembly according to any claim 13 and 14, characterised in that said engaging
seat (47) comprises an upper wall (49) formed by said mouth for feeding regeneration
water into the salt tank (5), communicating with the gate valve (23), a rear wall
(51) which acts as a stop surface for the gate valve (23) in the position of engaging
in the relevant seat (47), and a lower wall (53) provided with a first (55) and at
least a second (57) opening vertically aligned with a corresponding one of said interception
elements (29, 31) so as to send the water received from the gate valve (23) towards
a corresponding one of said conduits (19,21) of the decalcifier (1).
16. An assembly according to any claim 11 to 15, characterised in that said first support
means and said selector comprise means which can be reciprocally engaged to lock axial
sliding of the rod (25) without preventing its rotation.
17. An assembly according to the previous claim, characterised in that said reciprocally
engagable means are in the form of a small tooth (63) extending from the front surface
of the U-shaped bracket (59) and of an arched track (41) formed through the thickness
of the selector (27), said tooth (63) defining a groove which can be slidingly snap-hooked
on an arched edge of said track (41).
18. An assembly according to the previous claim, wherein the front surface of the selection
wheel (39) provides a series of angularly spaced impressions (43), each of which corresponds
to a working condition which can be selected by the user, characterised in that a
working condition is selected when the tooth (63) reaches a position diametrically
opposite the impression (43) corresponding to the chosen working condition.
19. An assembly according to any one of claims 8 to 18, characterised in that four different
working conditions are provided which can be obtained by rotating the selector (27)
by steps of 300, with the first working condition corresponding to a vertical arrangement
of an interception element (31) and horizontal of the other interception element (29).
20. An assembly according to any one of the previous claims, characterised in that the
selector (27) can be actuated manually by the user.