CN211116446U - Cavitation erosion resistant valve plate for closed swash plate axial plunger pump - Google Patents
Cavitation erosion resistant valve plate for closed swash plate axial plunger pump Download PDFInfo
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- CN211116446U CN211116446U CN201922211747.2U CN201922211747U CN211116446U CN 211116446 U CN211116446 U CN 211116446U CN 201922211747 U CN201922211747 U CN 201922211747U CN 211116446 U CN211116446 U CN 211116446U
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Abstract
The utility model belongs to the technical field of hydraulic component. In order to solve in the conventional valve plate cell type in advance step up and in advance release structure can cause the problem that cavitation erosion destroyed to the cylinder body valve surface, the utility model discloses an anti cavitation erosion type valve plate for closed sloping cam plate axial plunger pump. The valve plate comprises a body, two end face waist-shaped windows, two bottom face waist-shaped windows and four through grooves; the end face waist-shaped window and the bottom face waist-shaped window are coaxially arranged and are respectively positioned on the two end faces of the body, and the end face waist-shaped window is axially communicated with the bottom face waist-shaped window; the four through grooves are communicated with the end parts of the two end face waist-shaped windows and are distributed in a transition area between the two adjacent end face waist-shaped windows as a pre-boosting and pre-pressure-releasing structure, and the through grooves penetrate through the body along the axial direction and then are positioned in the bottom face waist-shaped windows. The utility model discloses an anti cavitation type valve plate can reduce and change the cavitation degree and the cavitation position of valve in-process, weakens the cavitation erosion destruction to cylinder body valve surface.
Description
Technical Field
The utility model belongs to the technical field of hydraulic component, concretely relates to closed sloping cam plate axial plunger pump is with anti cavitation erosion type valve plate.
Background
The swash plate type axial plunger pump is widely applied to various industries of national economy due to the advantages of compact structure, high power density and the like, and is particularly widely applied to a closed hydraulic driving system of a walking machine. The cylinder body and the valve plate are one of key friction pairs of the axial plunger pump, and the conventional friction pair material matching adopts a soft and hard matching scheme. In the process of developing the plunger pump towards the high-pressure direction, in order to ensure that the valve plate has enough strength, the valve plate is usually of an all-steel structure, and the valve surface of the cylinder body corresponding to the valve plate is made of a wear-resistant copper alloy material with weaker strength.
In a sealing transition area of a conventional valve plate, a groove-shaped pre-pressure boosting structure and a groove-shaped pre-pressure releasing structure are usually arranged to realize smooth transition of pressure in a plunger cavity and avoid an overpressure phenomenon. However, in the relative rotation process of the valve plate and the cylinder body, cavitation can also occur at the position of the groove-shaped pre-pressure-increasing and pre-pressure-releasing structure, at the moment, because the groove-shaped pre-pressure-increasing and pre-pressure-releasing structure is completely attached to the valve surface of the cylinder body, the cavitation occurrence position is also completely attached to the valve surface of the cylinder body, so that the valve surface of the cylinder body made of copper alloy material is very easy to generate cavitation erosion damage, and the service life and the reliability of the plunger pump are seriously influenced.
SUMMERY OF THE UTILITY MODEL
In order to solve in the conventional valve plate cell type in advance step up and in advance release structure can cause the problem that cavitation erosion destroyed to the cylinder body valve surface, the utility model provides an anti cavitation erosion type valve plate for closed sloping cam plate axial plunger pump. The valve plate comprises a body, two end face waist-shaped windows, two bottom face waist-shaped windows and four through grooves; the end face waist-shaped window and the bottom face waist-shaped window are coaxially arranged and are respectively positioned on two end faces of the body, and the end face waist-shaped window is axially communicated with the bottom face waist-shaped window; the four through grooves are respectively communicated with the end parts of the two end face waist-shaped windows and are distributed in a transition area between the two adjacent end face waist-shaped windows as a pre-pressure boosting structure and a pre-pressure relief structure, and the through grooves penetrate through the body along the axial direction and are located in the bottom face waist-shaped window.
Preferably, the through groove is in a composite hole structure form and is formed by sequentially arranging and connecting a plurality of holes in different shapes.
Preferably, the through groove is formed by sequentially arranging and connecting triangular holes, rectangular holes and semicircular holes along the direction of the extension of the end face waist-shaped window.
Preferably, the through groove is formed by sequentially arranging and connecting triangular holes, rectangular holes and triangular holes along the direction of the extension of the end face waist-shaped window.
Preferably, the included angle between two adjacent through grooves is smaller than the wrap angle of the oil inlet and outlet window of the cylinder plunger cavity.
Preferably, the valve plate is also provided with a semi-ring boss; the semi-ring boss is positioned on the flow distribution end face of the body and is coaxially arranged with the end face kidney-shaped window; the end face waist-shaped window and the through groove are arranged on the semi-ring boss.
Preferably, the end face waist-shaped window is internally provided with a reinforcing rib and extends to the bottom face waist-shaped window along the axial direction to divide the bottom face waist-shaped window into two bottom face waist-shaped windows.
Preferably, the sizes of the through groove structures at two ends of the same end face waist-shaped window are different, and the sizes of the two through groove structures which are positioned at different end face waist-shaped windows and are symmetrical along the circle center are equal.
Compare in conventional valve plate, the utility model discloses an anti cavitation erosion type valve plate for closed sloping cam plate axial plunger pump has following beneficial technological effect:
the utility model discloses in, through the sealed transition zone that will be located the valve plate and be used for pre-boosting and the structural design of pressure release for leading to the groove form, make simultaneously lead to the groove and run through and lie in bottom waist shape window region behind the valve plate body. At the moment, in the process of relatively rotating at a high speed between the cylinder body and the valve plate, because the flow velocity of the fluid passing through the through groove is increased to form a vortex, bubbles generated by the reduction of the local pressure of the fluid can be led to a waist-shaped window area at the bottom of the valve plate by the through groove, so that the bubbles are far away from the valve surface of the cylinder body, and the direct damage to the valve surface of the cylinder body made of a flexible material due to cavitation erosion on the valve surface of the cylinder body is avoided. Therefore, the smooth transition of the pressure of the plunger cavity can be ensured, the overpressure is avoided, the cavitation degree and the cavitation position in the flow distribution process can be effectively reduced and changed, the cavitation damage to the flow distribution surface of the cylinder body is weakened, and the protection and the service life of the pump body are improved.
Drawings
Fig. 1 is a schematic end view of a cavitation erosion resistant port plate for a closed swash plate axial plunger pump according to embodiment 1 of the present invention;
fig. 2 is a schematic perspective view of a cavitation erosion resistant port plate for a closed swash plate axial plunger pump according to embodiment 1 of the present invention;
fig. 3 is a schematic bottom view of a cavitation erosion resistant port plate for a closed swash plate axial plunger pump according to embodiment 1 of the present invention;
FIG. 4 is a schematic cross-sectional view taken along lines E-E and F-F of FIG. 3;
fig. 5 is a schematic end view of a cavitation erosion resistant port plate for a closed swash plate axial plunger pump according to embodiment 2 of the present invention;
fig. 6 is a schematic perspective view of a cavitation erosion resistant port plate for a closed swash plate axial plunger pump according to embodiment 2 of the present invention;
fig. 7 is a schematic bottom view of a cavitation erosion resistant port plate for a closed swash plate axial plunger pump according to embodiment 2 of the present invention;
FIG. 8 is a schematic cross-sectional view taken along lines M-M and N-N of FIG. 7.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and embodiments.
Example 1
Referring to fig. 1 to 4, the cavitation erosion resistant port plate for the closed swash plate axial plunger pump of the present embodiment includes a body 1, two end face kidney-shaped windows 2, two bottom face kidney-shaped windows 3, and four through grooves 41, 42, 43, and 44. The two end face waist-shaped windows 2 are positioned on the end face of the body 1 and are symmetrically arranged around the circle center, and the two bottom face waist-shaped windows 3 are positioned on the bottom face of the body 1 and are symmetrically arranged around the circle center. The end face waist-shaped window 2 and the bottom face waist-shaped window 3 are coaxially arranged, and the end face waist-shaped window 2 and the bottom face waist-shaped window 3 are communicated along the axial direction. The through grooves are communicated with the end parts of the end face waist-shaped windows as pre-pressure boosting and pre-pressure releasing structures, the four through grooves are communicated with the end parts of the two end face waist-shaped windows 2 respectively, are distributed in a sealing transition area between the two end face waist-shaped windows 2, and penetrate through the body 1 along the axial direction and then are positioned in the bottom face waist-shaped windows 2.
Preferably, in the present embodiment, the four through slots 41, 42, 43 and 44 are all in a composite hole structure form, and are formed by sequentially arranging and connecting triangular holes, rectangular holes and semicircular holes along the extension direction of the end face kidney-shaped window 2. At the moment, the composite hole formed by sequentially connecting the triangular hole, the rectangular hole and the semicircular hole is used as the through groove, so that the smooth transition effect of the pressure in the plunger cavity can be improved, and the overpressure phenomenon is effectively avoided.
Preferably, in this embodiment, an included angle between two adjacent through grooves in the circumferential direction is smaller than a wrap angle of an oil inlet and outlet window of the cylinder plunger cavity, that is, an included angle between the through groove 41 and the through groove 44 and an included angle between the through groove 42 and the through groove 43 are both smaller than a wrap angle of an oil outlet window of the cylinder plunger cavity. Therefore, in the relative rotation process between the valve plate and the cylinder body, negative covering of the through groove can be formed, and noise caused by pressure pulse when the high pressure and low pressure switching is carried out on the plunger cavity of the cylinder body is reduced.
In addition, in the anti-cavitation type port plate for the closed swash plate axial plunger pump of the present embodiment, a half ring boss 5 is further provided. The semi-ring boss 5 is located on the flow distribution end face of the body 1 and is arranged coaxially with the body 1, the end face waist-shaped window 2 and the four through grooves 41, 42, 43 and 44 are arranged on the semi-ring boss 5, and meanwhile, the surface of the semi-ring boss 5 is an arc-shaped surface and is directly attached and contacted with the flow distribution face of the cylinder body. At the moment, compared with the situation that the whole end face of the valve plate is in close contact with the cylinder body in the prior art, the friction area between the valve plate main body and the cylinder body can be reduced by adopting the semi-ring boss, and meanwhile, because the cylinder body sucks oil liquid by utilizing pressure difference, although a gap is reserved between the inner end face of the waist-shaped window on the bottom surface for liquid inlet and the cylinder body, the gap is not enough to influence the liquid pumping amount, so that the semi-ring boss structure can effectively reduce the friction force and prolong the service life of the valve plate and the cylinder body.
Preferably, a reinforcing rib 6 is further arranged inside the end-face waist-shaped window 2 of the present embodiment, and extends to the bottom-face waist-shaped window 3 along the axial direction, so as to divide the bottom-face waist-shaped window 3 into two small bottom-face waist-shaped windows as liquid inlet waist-shaped windows. At the moment, the structural stability of the end face waist-shaped window and the bottom face waist-shaped window can be improved by means of the reinforcing ribs, and the flow distribution accuracy between the flow distribution plate and the cylinder body is guaranteed.
In addition, in the present embodiment, the size structures of the through grooves at two ends of the waist-shaped window on the same end face are different, while the size structures of the two through grooves located at the waist-shaped windows on different end faces and symmetric along the circle center are equal, that is, the size structures of the through grooves 41 and 43 are the same, and the size structures of the through grooves 42 and 44 are the same.
Example 2
As shown in fig. 5 to 8, the structural form of the anti-cavitation port plate for the closed swash plate axial plunger pump in the present embodiment is the same as that of the anti-cavitation port plate for the closed swash plate axial plunger pump in embodiment 1, and the difference is only that: the through grooves 41a, 42a, 43a and 44a in the embodiment are formed by sequentially arranging and connecting triangular holes, rectangular holes and triangular holes, and at the moment, the smooth transition effect on the pressure in the plunger cavity can be improved, and the overpressure phenomenon is effectively avoided.
Claims (8)
1. An anti-cavitation type port plate for a closed swash plate axial plunger pump is characterized by comprising a body, two end face waist-shaped windows, two bottom face waist-shaped windows and four through grooves; the end face waist-shaped window and the bottom face waist-shaped window are coaxially arranged and are respectively positioned on two end faces of the body, and the end face waist-shaped window is axially communicated with the bottom face waist-shaped window; the four through grooves are respectively connected with the end parts of the two end face waist-shaped windows and are distributed in a transition area between the two adjacent end face waist-shaped windows as a pre-pressure boosting structure and a pre-pressure relief structure, and the through grooves penetrate through the body along the axial direction and are located in the bottom face waist-shaped window.
2. The anti-cavitation port plate according to claim 1, wherein the through groove is in a composite hole structure form and is formed by sequentially arranging and connecting a plurality of holes with different shapes.
3. The anti-cavitation port plate according to claim 2, wherein the through groove is formed by sequentially connecting triangular holes, rectangular holes and semicircular holes in the direction of the extension of the end face kidney-shaped window.
4. The anti-cavitation port plate according to claim 2, wherein the through groove is formed by sequentially connecting triangular holes, rectangular holes and triangular holes along the direction of the extension of the end face kidney-shaped window.
5. The anti-cavitation port plate according to claim 1, wherein an included angle between two adjacent through grooves is smaller than a wrap angle of an oil inlet and outlet window of a cylinder plunger cavity.
6. The anti-cavitation port plate according to any one of claims 1 to 5, further provided with a half-ring boss; the semi-ring boss is positioned on the flow distribution end face of the body and is coaxially arranged with the end face kidney-shaped window; the end face waist-shaped window and the through groove are arranged on the semi-ring boss.
7. The anti-cavitation port plate according to any one of claims 1 to 5, wherein the end face kidney-shaped window is internally provided with a reinforcing rib and extends to the bottom face kidney-shaped window along the axial direction to divide the bottom face kidney-shaped window into two bottom face kidney-shaped windows.
8. The anti-cavitation port plate according to any one of claims 1 to 5, wherein the sizes of the through groove structures at two ends of the same end face kidney-shaped window are different, and the sizes of the two through groove structures at different end face kidney-shaped windows and symmetrical along the circle center are equal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922211747.2U CN211116446U (en) | 2019-12-11 | 2019-12-11 | Cavitation erosion resistant valve plate for closed swash plate axial plunger pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922211747.2U CN211116446U (en) | 2019-12-11 | 2019-12-11 | Cavitation erosion resistant valve plate for closed swash plate axial plunger pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211116446U true CN211116446U (en) | 2020-07-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922211747.2U Active CN211116446U (en) | 2019-12-11 | 2019-12-11 | Cavitation erosion resistant valve plate for closed swash plate axial plunger pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211116446U (en) |
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2019
- 2019-12-11 CN CN201922211747.2U patent/CN211116446U/en active Active
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