A dynamic pressure balance type sliding shoe structure

Abstract

The present invention discloses a dynamic pressure balance type sliding shoe structure, including a sliding shoe, a plunger and a copper pad; the copper pad is provided with a plurality of high-pressure dynamic support flow channels penetrating the copper pad, and a radial support oil flow channel and a pressure storage chamber are provided on the plane where the copper pad and the sliding shoe cooperate, and the high-pressure dynamic support flow channel is connected with the support oil flow channel; the support oil flow channel is connected with the pressure storage chamber; an energy storage bladder is installed in the pressure storage chamber; in the support oil flow channel, on both sides of the pressure storage chamber, a high-pressure dynamic pressure sensing variable valve 1 and 2 are embeddedly installed at a position far from the center, and a low-pressure dynamic pressure sensing variable valve 1 and 2 are embeddedly installed at a position close to the center. The present invention can realize compensation for the sliding shoe support under high revolution speed conditions, and can make the sliding shoe surface still provide sufficient bearing capacity in the low-pressure area, effectively reducing the wear of the sliding shoe surface.

Description

Technical Field

[0001] The invention relates to the field of swash plate type axial piston pump structure design, and in particular to a dynamic pressure balance type sliding shoe structure. Background Art

[0002] The slipper of the plunger pump is a key component that supports the relative movement of the plunger and the swash plate. When the plunger-slipper assembly moves to the low-pressure area, the support pressure of the friction pair oil film decreases, and it cannot provide sufficient oil film bearing capacity for the relative movement of the slipper, resulting in rigid wear on the surface of the slipper and the swash plate, damaging the surface of the slipper pair, and reducing the service life of the plunger pump. How to ensure that the slipper pair oil film can provide sufficient bearing capacity when the slipper moves in the low-pressure area is the key to improving the service life of the plunger pump. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a dynamic pressure-balanced slipper structure, which optimizes the design of the internal structure of the slipper, increases the high-pressure support flow channel of the slipper oil film, and adopts the method of charging the low-pressure flow channel to provide boosted pressure support in the low-pressure area.

[0004] The purpose of the present invention is achieved through the following technical solutions:

[0005] A dynamic pressure balance type sliding shoe structure, comprising a sliding shoe, a plunger and a copper pad; wherein the sliding shoe is connected to the plunger through a hinge structure, and the copper pad is installed on the surface of the sliding shoe; an inlet flow channel penetrating along the axial direction is provided on the copper pad, and is connected to a sliding shoe oil flow channel penetrating along the axial direction on the sliding shoe;

[0006] The copper pad is provided with a plurality of high-pressure dynamic support flow channels that penetrate the entire copper pad, and a radial support oil flow channel and a pressure storage chamber are provided on the plane where the copper pad and the sliding shoe cooperate, and the high-pressure dynamic support flow channel is communicated with the support oil flow channel; the support oil flow channel is communicated with the pressure storage chamber; and an energy storage bladder is installed in the pressure storage chamber;

[0007] In the supporting oil flow channel, on both sides of the pressure storage cavity, high-pressure dynamic pressure-sensitive variable valve 1 and high-pressure dynamic pressure-sensitive variable valve 2 are embeddedly installed at a position far from the center, and low-pressure dynamic pressure-sensitive variable valve 1 and low-pressure dynamic pressure-sensitive variable valve 2 are embeddedly installed near the center.

[0008] Furthermore, the supporting oil flow channel comprises an upper supporting oil flow channel and a lower supporting oil flow channel, the upper supporting oil flow channel is processed on the copper pad, and the lower supporting oil flow channel is processed on the sliding shoe.

[0009] Furthermore, there are multiple upper support oil flow channels and lower support oil flow channels, which correspond one to one. The multiple lower support oil flow channels are connected through an annular pressure equalizing groove processed on the sliding shoe to achieve pressure equalization.

[0010] Furthermore, the upper support oil flow channel and the lower support oil flow channel are evenly distributed in a cross shape.

[0011] Furthermore, the high-pressure dynamic pressure-sensing variable valve 1 and the high-pressure dynamic pressure-sensing variable valve 2 are axially symmetrically installed or staggered in the lower supporting oil flow channel; the low-pressure dynamic pressure-sensing variable valve 1 and the low-pressure dynamic pressure-sensing variable valve 2 are axially symmetrically installed or staggered in the lower supporting oil flow channel.

[0012] Furthermore, the high-pressure dynamic support flow channel is connected to the support oil flow channel at an end of the support oil flow channel away from the center.

[0013] Furthermore, an annular low-pressure dynamic support flow channel is opened on the surface of the copper pad away from the sliding shoe. When the pressurized oil in the inlet flow channel flows out of the sliding shoe, it is filled with oil to play a role of static pressure support.

[0014] The beneficial effects of the present invention are as follows:

[0015] 1. The dynamic pressure balance type slipper structure of the present invention can realize compensation for the slipper support under high revolution speed conditions, and can ensure that the slipper surface can still provide sufficient bearing capacity in the low pressure area, thereby effectively reducing the wear of the slipper surface.

[0016] 2. Through the high-pressure dynamic pressure-sensitive variable valve and the low-pressure dynamic pressure-sensitive variable valve structure inside the slipper, the bearing capacity can be controlled, the non-uniform pressure field support can be achieved, and the wear caused by the uneven oil film due to inertia and slipper overturning can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram of the plunger shoe assembly.

[0018] Figure 2 This is the main cross-sectional view of the plunger and shoe assembly.

[0019] Figure 3 It is a 3D view of the copper pad, where the left image shows the surface of the copper pad away from the sliding shoe, and the right image shows the surface that cooperates with the sliding shoe.

[0020] Figure 4 This is a three-dimensional image of a sliding boot.

[0021] Figure 5 It is the front view of the plunger shoe assembly.

[0022] Figure 6 for Figure 5EE view of the .

[0023] In the figure, the slipper 1, the plunger 2, the copper pad 3, the high-pressure dynamic pressure sensing variable valve 14, the high-pressure dynamic pressure sensing variable valve 25, the low-pressure dynamic pressure sensing variable valve 1 6, the low-pressure dynamic pressure sensing variable valve 2 7, the high-pressure dynamic support flow channel 8, the low-pressure dynamic support flow channel 9, the pressure storage chamber 10, the energy storage bladder 11, the pressure equalizing tank 12, the inlet flow channel 13, the upper support oil flow channel 14, the lower support oil flow channel 15, and the slipper oil flow channel 16. DETAILED DESCRIPTION

[0024] The present invention will be described in detail below based on the accompanying drawings and preferred embodiments, and the purpose and effects of the present invention will become more clear. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] like Figure 1 As shown, a dynamic pressure balance type sliding shoe structure includes a sliding shoe 1, a plunger 2 and a copper pad 3. Figure 2 As shown, the sliding shoe 1 is connected to the plunger 2 through a hinge structure; the copper pad 3 is installed on the plane of the sliding shoe 1 by pressure welding. The copper pad 3 is provided with an inlet flow channel 13 that penetrates along the axial direction and is connected to the sliding shoe oil flow channel 16 that penetrates along the axial direction on the sliding shoe 1. Figure 3 As shown in the left figure, the copper pad 3 is provided with multiple high-pressure dynamic support channels 8 evenly distributed along the circumferential direction on the surface away from the sliding shoe 1. The high-pressure dynamic support channel 8, like the inlet channel 13, penetrates the copper pad 3 along the axial direction. The copper pad 3 is also provided with an annular low-pressure dynamic support channel 9 on the surface away from the sliding shoe 1. When the pressurized oil in the inlet channel 13 flows out of the sliding shoe, it is filled with oil and plays a role of static pressure support. Figure 3 As shown in the right figure, a plurality of upper supporting oil flow channels 14 are provided on the plane where the copper pad 3 and the sliding shoe 1 cooperate, and the plurality of high-pressure dynamic supporting flow channels 8 correspond one-to-one to the plurality of upper supporting oil flow channels 14, and the port of the high-pressure dynamic supporting flow channel 8 is located at the outer end of the upper supporting oil flow channel 14.

[0026] like Figure 4 As shown, the surface of the sliding shoe 1 that cooperates with the copper pad 3 is also provided with a plurality of lower supporting oil flow channels 15 that are distributed in a cross shape and radiate radially from the center. The upper supporting oil flow channel 14 corresponds to the lower supporting oil flow channel 15 one by one, and together constitutes the supporting oil flow channel. The surface of the sliding shoe 1 that cooperates with the copper pad 3 is also provided with a pressure storage chamber 10 that corresponds to and is connected to the lower supporting oil flow channel 15 one by one. An energy storage bladder 11 is installed in each pressure storage chamber 10 to increase the pressure of the pressure storage chamber 10. The pressure of the pressure storage chamber 10 is adjusted by charging the energy storage bladder 11. The surface of the sliding shoe 1 that cooperates with the copper pad 3 is also provided with an annular pressure equalizing groove 12 that is connected to the plurality of lower supporting oil flow channels 15.

[0027] like Figure 5 and Figure 6 As shown, in each lower support oil flow channel 15, a high-pressure dynamic pressure sensing variable valve 1 4 and a high-pressure dynamic pressure sensing variable valve 2 5 are embedded and installed at a position far from the center, and a low-pressure dynamic pressure sensing variable valve 1 6 and a low-pressure dynamic pressure sensing variable valve 2 7 are embedded and installed near the center. The high-pressure dynamic pressure sensing variable valve 1 4 and the high-pressure dynamic pressure sensing variable valve 2 5, and the low-pressure dynamic pressure sensing variable valve 1 6 and the low-pressure dynamic pressure sensing variable valve 2 7 can be installed axially symmetrically or staggered in the lower support oil flow channel 15. The pressure storage chamber 10 is located between the two pairs of high-pressure valves and low-pressure valves.

[0028] In this embodiment, the support flow channel is divided into an upper support oil flow channel 14 and a lower support oil flow channel 15, which are respectively processed on the surface of the copper pad 3 and the sliding shoe 1, and a closed and complete support flow channel is formed by welding the copper pad 3 and the sliding shoe 1. Of course, the entire support flow channel can also be processed on the surface of the sliding shoe 1. The pressure equalizing groove 12 can also be processed on the copper pad 3.

[0029] The working principle of the dynamic pressure balance slipper structure of this embodiment is as follows: when the high-pressure oil is conducted from the slipper oil flow channel 16 to the inlet flow channel 13 of the copper pad 3, the low-pressure dynamic pressure sensing variable valve 1 6 and the low-pressure dynamic pressure sensing variable valve 2 7 are opened. At this time, the high-pressure oil is conducted to flow into the pressure storage chamber 10, and compresses the energy storage bladder 11. After the pressure in the pressure storage chamber 10 is increased to the same as that in the high-pressure area, the low-pressure dynamic pressure sensing variable valve 1 6 and the low-pressure dynamic pressure sensing variable valve 2 7 are closed; when the low-pressure oil is conducted from the slipper oil flow channel 16 to the inlet flow channel 13 of the copper pad 3, the high-pressure dynamic pressure sensing variable valve 1 4 and the high-pressure dynamic pressure sensing variable valve 2 5 are opened. At this time, the oil in the pressure storage chamber 10 is released, and the oil flows into the moving pair of the slipper through the high-pressure dynamic support flow channel 8, providing high-pressure fluid support for the slipper at this time.

[0030] By using the embodiments of the present application, it can be realized that during the actual operation of the plunger pump, the slipper 1 is affected by the centrifugal force and inertia under high-speed conditions, resulting in rigid wear when the slipper 1 moves to the low-pressure area. The present invention is used to compensate for the slipper support under high orbital speed conditions, so that in the low-pressure area, the slipper surface can still provide sufficient bearing capacity, thereby effectively reducing the wear on the slipper surface.

[0031] Those skilled in the art can understand that the above are only preferred examples of the invention and are not intended to limit the invention. Although the invention is described in detail with reference to the above examples, those skilled in the art can still modify the technical solutions recorded in the above examples or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, etc. made within the spirit and principle of the invention shall be included in the protection scope of the invention.

Claims

1. A dynamic pressure balance type sliding shoe structure, characterized in that: The invention comprises a sliding shoe (1), a plunger (2) and a copper pad (3); wherein the sliding shoe (1) is connected to the plunger (2) via a hinge structure, and the copper pad (3) is installed on the surface of the sliding shoe (1); the copper pad (3) is provided with an inlet flow channel (13) which is axially penetrated and communicates with a sliding shoe oil flow channel (16) which is axially penetrated on the sliding shoe (1); The copper pad (3) is provided with a plurality of high-pressure dynamic support flow channels (8) that penetrate the entire copper pad (3); a radial support oil flow channel and a pressure storage chamber (10) are provided on the plane where the copper pad (3) and the sliding shoe (1) cooperate; the high-pressure dynamic support flow channel (8) is communicated with the support oil flow channel; the support oil flow channel is communicated with the pressure storage chamber (10); and an energy storage bladder (11) is installed in the pressure storage chamber (10); In the supporting oil flow channel, on both sides of the pressure storage chamber (10), a high-pressure dynamic pressure sensing variable valve 1 (4) and a high-pressure dynamic pressure sensing variable valve 2 (5) are embeddedly installed at a position far from the center, and a low-pressure dynamic pressure sensing variable valve 1 (6) and a low-pressure dynamic pressure sensing variable valve 2 (7) are embeddedly installed at a position close to the center.

2. The dynamic pressure balance type sliding shoe structure according to claim 1, characterized in that: The supporting oil flow channel comprises an upper supporting oil flow channel (14) and a lower supporting oil flow channel (15); the upper supporting oil flow channel (14) is processed on the copper pad (3), and the lower supporting oil flow channel (15) is processed on the sliding shoe (1).

3. The dynamic pressure balance type sliding shoe structure according to claim 2, characterized in that: There are a plurality of upper support oil flow channels (14) and lower support oil flow channels (15), which correspond one to one. The plurality of lower support oil flow channels (15) are connected via an annular pressure equalizing groove (12) machined on the sliding shoe (1) to achieve pressure equalization.

4. The dynamic pressure balance type sliding shoe structure according to claim 3, characterized in that: The upper supporting oil flow channel (14) and the lower supporting oil flow channel (15) are evenly distributed in a cross shape.

5. The dynamic pressure balance type sliding shoe structure according to claim 1 or 4, characterized in that: The high-pressure dynamic pressure sensing variable valve 1 (4) and the high-pressure dynamic pressure sensing variable valve 2 (5) are axially symmetrically installed or staggered installed in the lower supporting oil flow channel (15); the low-pressure dynamic pressure sensing variable valve 1 (6) and the low-pressure dynamic pressure sensing variable valve 2 (7) are axially symmetrically installed or staggered installed in the lower supporting oil flow channel (15).

6. The dynamic pressure balance type sliding shoe structure according to claim 1, characterized in that: The high-pressure dynamic support flow channel (8) is connected to the support oil flow channel at an end of the support oil flow channel away from the center.

7. The dynamic pressure balance type shoe structure according to claim 1, characterized in that: An annular low-pressure dynamic support channel (9) is provided on the surface of the copper pad (3) away from the sliding shoe (1). When the pressurized oil in the inlet channel (13) flows out of the sliding shoe, it is filled with oil and plays a role of static pressure support.

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