BACKGROUND OF THE INVENTION
1. Technical Field
[0001] The present invention relates to high-pressure pumps and, more particularly, to a
to high-pressure pump equipped with a plurality of improved plunger-slipper assemblies.
2. Description of Related Art
[0002] An oil diffusion pump, as shown in
Figure 1, comprises a rotary shaft
91 in a housing
90 and a plunger seat
92 which is connected with rotary shaft
91. A plurality of plunger holes
921 are axially arranged as a circle and each of the plunger holes
921 has a plunger
93 deposited therein. Each said plunger
93 comprises a universal plunger head
931 which is retained in a plunger hole
991 of a rocking plate
99. A tilting plate
94 can be provided in the housing
90 coaxially with the rotary shaft
91, the tilting angle of which is adjustable. The tilting plate
94 has a contacting surface
941 and each plunger head
931 contacts with the contacting surface
941 along the direction parallel to the rotary shaft
91. When the plunger seat
92 is propelled by the rotary shaft
91, each said plunger
93 circles the rotary shaft
91. In virtue of the tilting angle of the tilting plate
94, each said plunger
93 performs a stroke having a predetermined length during each trip around the rotary
shaft
91. The rocking plate
99 rocks in harmony with the movement of each said plunger head
931. Thereby oil can be injected into the plunger seat
92 through the oil inlet piping
95 that is communicated with the housing
90 and, after an expectative pressure boost is provided to the oil, the oil can be output
through the oil outlet piping
96 that is communicated with the housing
90.
[0003] Referring to
Figure 2, an accommodating space
933 provided on the plunger head
931 is sized to snugly receive yet allow rotational movement of a round joint
932 of the plunger
93 so as to enable an universal rotational movement of the plunger head
931.
[0004] It is known by skilled persons in the art that due to the design of the plungers,
the plunger heads and the titling plate of the high-pressure pump as depicted in
Figure 1, the trip of the plunger within the plunger hole is relatively limited. Consequently,
the expectative pressure boost of oil performed by the high-pressure pump is restricted
from substantial increase. A further plunger-slipper assembly having the technical
features as defined in the preamble of claim 1 is e.g. known from
GB 1,096,295 A.
SUMMARY OF THE INVENTION
[0005] The present invention has been accomplished under these circumstances in view. It
is one objective of the present invention to provide a novel plunger-slipper assembly
structure in a high-pressure pump as shown in
Figure 4. The disclosed plunger-slipper assembly facilitates generating a relatively larger
stroke length so as to significantly enhance the oil pressure of high-pressure pumps
of such type. Also, a particular lubrication solution is provided herein for retarding
the abrasion of the disclosed plunger-slipper assembly that performs an enhanced stroke.
[0006] To achieve these and other objectives of the present invention, the plunger-slipper
structure of a high-pressure pump comprises a plunger and a slipper. The plunger has
a first end and a second end, which are both spherical ends. The slipper comprises
a coaxial hole for receiving the plunger and the coaxial hole has a spherical space
formed at the extremity thereof for accommodating the second end of the plunger. The
first end of the plunger juts out from the slipper. An oil-filling channel lengthwise
penetrates the plunger through the first end to the second end thereof. An oil-guiding
channel radially penetrates the wall of the slipper and connects with the extremity
of the coaxial hole. A first annular groove is deposited at the identical peripheral
position of the outer wall of the slipper where the oil-guiding channel is settled.
A third annular groove is also deposited surrounding the outer wall of the slipper
and is separated from the first annular groove with a predetermined distance. The
location of the third annular groove is near the second end of the plunger. An annular
stuff is settled in the third annular groove.
BRIEF DESCRIPTION OF THE DRAWINGS
[0007] The invention as well as a preferred mode of use, further objectives and advantages
thereof, will best be understood by reference to the following detailed description
of an illustrative embodiment when read in conjunction with the accompanying drawings,
wherein:
Figure 1 is a schematic cross sectional view of a conventional oil diffusion pump;
Figure 2 is a schematic cross sectional view of the plunger-slipper assembly of the conventional
oil diffusion pump;
Figure 3 is an exploded view illustrating the plunger-slipper assemblies, a plunger seat and
a rotary valve of the disclosed subject matter;
Figure 4 is a schematic cross sectional view showing the assembled plunger-slipper assemblies,
the plunger seat and the rotary valve of the disclosed subject matter settled in a
housing of an oil pressure pump;
Figure 5 is a perspective view of the plunger-slipper assembly of the present invention;
Figure 6 is a plane view of the plunger-slipper assembly of the present invention; and
Figure 7 is a lengthwise sectional view of the plunger-slipper assembly of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0008] In
Figure 3, a plunger seat
10, a plurality of plunger-slipper assemblies
50 and a rotary valve
30 are illustrated. Each of the plural plunger-slipper assemblies
50 has a spherical end
52 received by a hemispheric recess
11 provided on the plunger seat
10. A plunger retaining plate
12 is fixed on the extremity of the plunger seat
10 by a plurality of screws
16. A plurality of holes
15 arranged on the plunger seat
10 is provided for engaging the spherical ends
52 respectively so as to prevent the plural plunger-slipper assemblies
50 from departing from the plunger seat
10.
[0009] Referring to
Figure 4, the plunger seat
10 is assembled into a housing
40 with a plurality of bearing components
13 and can be rotated by a rotary shaft
14. The rotary valve
30 is positioned in the housing
40 and is posed to tilt by a predetermined angle under the domination of an angle-setting
device
70. The rotary valve
30 also provides a plurality of plunger channels
31 for allowing the disclosed plunger-slipper assemblies
50 snugly slide therein.
[0010] The rotary shaft
14 drives the plunger seat
10 to rotate, and in turn makes the plunger-slipper assemblies
50 and the rotary valve
30 rotate simultaneously. As the rotary valve
30 is posed to tilt by the preset angle, the inserting depth of each said plunger-slipper
assembly
50 into the plunger channel
31 varies during the rotary valve
30 makes a circuit, and a simulate plunger stroke can be accomplished. Then after oil
is injected into the rotary valve
30 through the oil inlet piping (not shown) that is communicated with the housing
40 and an expectative pressure boost is provided to the oil, the oil can be output through
the oil outlet piping (not shown) that is communicated with the housing
40.
[0011] The tilting angle of the rotary valve
30 and the stroke of the plunger-slipper assemblies
50 are subject to the setting of the aforementioned angle-setting device
70. While the larger the tilting angle of the rotary valve
30 is, the larger length of the stroke of the plunger-slipper assemblies
50 is allowed and the larger pressure boost is achieved. Otherwise, the effects are
contrary to the results above.
[0012] As the above-discussed structure of the high-pressure pump is well known in the art,
it is not in the scope of what the present invention claims for. The present invention,
however, aims at providing the structure of plunger-slipper assembly
50 operating in coordination therewith. The plunger-slipper assembly
50 facilitates generating a relatively larger stroke. Because of the larger stroke,
the plunger-slipper assembly
50 requires a particular lubrication solution so as to retard the abrasion thereof.
[0013] As shown in
Figures 5, 6 and
7, the plunger-slipper assembly
50 of the present invention comprises a plunger
51 and a slipper
55. The aforesaid spherical end of the plunger
51 for being engaged by the plunger seat
10 is defined as a first end
52 while the opposite end, which is also a spherical one, is defined as a second end
53. The slipper
55 comprises a coaxial hole
56 for receiving the plunger
51 and the coaxial hole
56 has a spherical space formed at the extremity thereof for accommodating the second
end
53 of the plunger
51. Further, the inner diameter of the coaxial hole
56 is slightly larger than the outer diameter of the plunger
51 so that a slightly rotational movement of the plunger
51 in the coaxial hole
56 is attainable. Thus, the tilting angle between the plunger-slipper assembly
50 and the plunger
10 is augmented and adapted to the rotary valve
30, which rotates with a sharp angle. Consequently, an enhanced plunger stroke distance
is achieved.
[0014] The plunger
51 is lengthwise penetrated by an oil-filling channel
54. Lubricating oil can be infused into the oil filler oil-filling channel
54 and be guided to between the slipper
55 and the plunger channel
31 by way of an oil-guiding channel
58 provided at the extremity of the coaxial hole
56.
[0015] The present invention is characterized by an oil-distributing unit
60, which comprises a first annular groove
61 and a second annular groove
62. The first annular groove
61 is deposited at the identical peripheral position where the oil-guiding channel
58 is settled while the second annular groove
62 is separated from the first annular groove
61 with a predetermined distance.
[0016] A third annular groove
63 is further separated from the second annular groove
62 with a predetermined distance therebetween. Meantime, an intrusive flange
57 is formed at the inner periphery of the coaxial hole
56 corresponding to the third annular groove
63. The flange
57 touches the second end
53 of the plunger
51 at a proper position so as to axially retain yet allow rotational movement of the
plunger
51. An annular stuff
64, such as a silicon ring, may be settled in the third annular groove
63 to fill up the vacancy between the slipper
55 and the rotary valve
30 so that the slipper
55 can move within the plunger channel
31 with improved stability.
[0017] In
Fig. 4, as the lubricating oil is infused at the oil-filling channel
54 of the plunger
51 and released at the oil-guiding channel
58, the released lubricating oil can therefore pervade the first annular groove
61. Then, the lubricating oil can be smeared evenly on the contact surfaces of the slipper
55 and the plunger channel
31 as a result of the relative displacement therebetween. Consequently, the lubricating
oil can further permeate the second annular groove
62. Since the first and second annular grooves
61, 62 are both narrow channels, when the slipper
55 moves along the plunger channel
31, the lubricating oil can be transitionally stored in the narrow channels and then
exude from the first and second annular grooves
61, 62. By the described means, the contact surfaces of the slipper
55 and the plunger channel
31 can be uniformly covered by the lubricating oil so as to generally reduce the friction
between the contact surfaces and permit a smoother movement of the slipper
55.
[0018] The annular stuff
64 functions as a barricade to keep the lubricating oil on the surface of the slipper
55 therebelow. Thus, the lubricating oil can fill the first and second annular grooves
61, 62 and then evenly distribute between the inner wall of the plunger channel
31 and the outer wall of the slipper
55 as a result of the movement of the slipper
55 with respect to the plunger channel
31. Hence, the lubricating oil can efficiently function with the least sufficient amount
that facilitates preventing the mess that an excessively great amount of oil congests
between the inner wall of the plunger channel
31 and the outer wall of the slipper
55 and overflows from the plunger channel
31.
[0019] Although a particular embodiment of the invention has been described in detail for
purposes of illustration, it will be understood by one of ordinary skill in the art
that numerous variations will be possible to the disclosed embodiments without going
outside the scope of the invention as disclosed in the claims.