CN112253415A - Axial plunger pump with flow distribution plate provided with mutually communicated damping holes - Google Patents

Abstract

In order to solve the problem of large flow pulsation of the conventional axial plunger pump, the disclosure provides an axial plunger pump with a flow distribution plate provided with intercommunicating damping holes, so as to reduce the flow pulsation of the axial plunger pump. By implementing the technical scheme disclosed by the invention, the backflushing backflow phenomenon of the axial plunger pump can be reduced, and the flow pulsation of the axial plunger pump is reduced.

Description

Axial plunger pump with flow distribution plate provided with mutually communicated damping holes

Technical Field

The disclosure relates to the field of mechanical engineering, in particular to an axial plunger pump with a valve plate provided with damping holes communicated with each other.

Background

The axial plunger pump is a swash plate type axial plunger pump which adopts an oil distribution disc to distribute oil, is an important power source device of a hydraulic system, and is widely applied to occasions with high pressure, large flow and flow needing to be adjusted. The axial plunger pump has the advantages of high rated pressure and easy flow regulation, but a larger oil backflow phenomenon can be generated when the oil discharging plunger is communicated with the oil discharging groove, so that the flow output of the axial plunger pump is pulsed, and the problem of large flow pulsation is caused.

Disclosure of Invention

In order to solve at least one of the above technical problems, the present disclosure provides an axial plunger pump having a port plate with a damping hole communicating with each other, so as to reduce flow pulsation of the axial plunger pump.

The axial plunger pump with the flow distribution plate provided with the mutually communicated damping holes comprises the flow distribution plate, wherein the flow distribution plate comprises:

a first orifice disposed in the top-dead-center transition region;

the second damping hole is arranged in the transition region of the bottom dead center;

and the first oil passage is arranged in the valve plate or on the lower surface of the valve plate and is used for communicating the first damping hole with the second damping hole.

Optionally, a check valve is arranged in the first oil passage, and the check valve is used for enabling oil in the first oil passage to flow to the first damping hole from the second damping hole only.

Optionally, the oil suction area of the port plate is provided with a first port window, the oil discharge area of the port plate is provided with a second port window, and the second port window is isolated from the first port window.

Optionally, the first orifice is located in a region of the top dead center transition region close to the first port, and the second orifice is located in a region of the bottom dead center transition region close to the second port.

Optionally, the interval angle between the first damping hole and the second damping hole is set to be a first time phase difference, and the first time phase difference is a time phase difference when the plunger enters the oil suction area and the oil discharge area.

Optionally, the first oil passage is located inside the valve plate, and the first damping hole and the second damping hole are blind holes with diameters of 0.5mm-5 mm.

Optionally, the first oil passage is located inside the valve plate, the valve plate includes a first valve plate body and a second valve plate body, a first groove is formed on one side of the first valve plate body facing the second valve plate body, a second groove is formed on one side of the second valve plate body facing the first valve plate body, and the first groove and the second groove are matched to form the first oil passage.

Optionally, the axial plunger pump includes a housing, the first oil passage is located on a lower surface of the port plate, a third groove is formed in the lower surface of the port plate, and the third groove is used for being matched with an inner surface of the housing to form the first oil passage.

Optionally, the axial plunger pump includes a main shaft, a cylinder block, a swash plate, a slipper wear-resisting plate, a slipper, a plunger, a housing and a bearing;

the two ends of the main shaft are rotatably connected with the shell through the bearings;

the main shaft penetrates through the cylinder body and is connected with the cylinder body through a spline;

one end of the cylinder body is provided with the valve plate, and the other end of the cylinder body is provided with the swash plate;

the cylinder body is provided with a plurality of plunger through holes which are uniformly distributed around the axis of the cylinder body, one end of the plunger axially penetrates into the plunger through hole, the other end of the plunger is connected with one end of the sliding shoe, and the other end of the sliding shoe is connected with the sliding shoe wear-resisting plate.

Has the advantages that: the axial plunger pump with the flow distribution plate provided with the mutually communicated damping holes can reduce the backflushing and back-flowing phenomena of the axial plunger pump and reduce the flow pulsation of the axial plunger pump.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.

FIG. 1 is a schematic diagram of an axial piston pump with a port plate having orifices in communication in accordance with an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a port plate according to an embodiment of the present disclosure;

FIG. 3 is a schematic illustration of a connection of a first oil passage of a port plate in an embodiment of the present disclosure;

FIG. 4 is a schematic angle diagram illustrating the spacing of the first orifice and the second orifice of the port plate according to an embodiment of the present disclosure.

Detailed Description

The present disclosure will be described in further detail with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the present disclosure. It should be further noted that, for the convenience of description, only the portions relevant to the present disclosure are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Referring to fig. 1 to 3, a schematic structural diagram of an axial plunger pump with a port plate having a damping hole in communication with each other includes a port plate 7, and the port plate 7 includes:

a first orifice 11 arranged in the transition region of the top dead center;

a second orifice 12 disposed in the bottom dead center transition region;

and a first oil passage 13 provided inside the port plate or on the lower surface of the port plate for communicating the first orifice 11 and the second orifice 12.

This openly links up first damping hole and the second damping hole of the valve plate of axial plunger pump through first oil way passageway, has guaranteed the effect of stepping up in advance of oil extraction district plunger chamber when reducing flow backward flow, has improved the efficiency of axial plunger pump.

The axial plunger pump disclosed by the invention has the advantages that the number of parts is not required to be increased, the flow pulsation of the pump is improved only through the structural design of the parts, and the structure is simple and the economical efficiency is good.

When the plunger of the axial plunger pump finishes an oil discharge stroke, namely the plunger is about to start an oil suction stroke to the second damping hole 12, high-pressure oil in the plunger flows out of a part of the second damping hole 12 to the first damping hole 11 and then flows into the corresponding plunger of an oil discharge area, so that the pressure in the cavity of the oil discharge plunger is increased in advance, the phenomenon of backflushing and backflow is reduced, and the flow pulsation of the axial plunger pump is reduced. The axial plunger pump can achieve the purpose of reducing the flow pulsation of the axial plunger pump without adjusting other components except the valve plate basically.

The transition area of the upper dead center is the transition area from the oil suction window to the oil discharge window of the port plate, and the transition area of the lower dead center is the transition area from the oil discharge window to the oil suction window of the port plate.

Referring to fig. 1 to 3, an axial plunger pump having a port plate includes a main shaft 1, a cylinder block 2, a swash plate 3, a slipper wear plate 4, a slipper 5, a plunger 6, a housing 8, and a bearing 9.

Two ends of the main shaft 1 are rotatably connected with the shell through bearings; the main shaft 1 penetrates through the cylinder body 2 and is connected with the cylinder body 2 through a spline; one end of the cylinder body 2 is provided with a valve plate 7, and the other end of the cylinder body 2 is provided with a swash plate 3; the cylinder body 2 is provided with a plurality of plunger through holes which are uniformly distributed around the axis, one end of each plunger through hole is provided with a plunger 6, one end of each plunger axially penetrates into the corresponding plunger through hole, the other end of each plunger is connected with one end of a sliding shoe 5, the other end of each sliding shoe 5 is connected with a sliding shoe wear-resisting plate 4, the cylinder body 2 is arranged in a shell 8,

when the plunger 6 finishes the oil discharge stroke to the second damping hole 12, a part of high-pressure oil in the plunger cavity where the plunger 6 is located flows out of the second damping hole 12 to the first damping hole 11, and the oil trapping phenomenon at the position is avoided. Meanwhile, the corresponding oil discharging plunger cavity in the transition area of the top dead center supplements high-pressure oil from the second damping hole 12 through the first damping hole 11, so that the pressure of the plunger cavity is increased in advance, and the phenomenon that the high-pressure oil flows backwards when the plunger cavity is transited to the second flow distribution window 15 is avoided.

Through holes are processed in the plunger 6 and the sliding shoe 5 to form a second oil passage; the second oil passage is respectively communicated with the plunger through hole and the flow distribution window, and an oil discharge port communicated with the second flow distribution window arranged on the flow distribution plate 7 and an oil suction port communicated with the first flow distribution window arranged on the flow distribution plate 7 are processed on the shell 8. The second flow distribution window is arranged on the oil discharge groove, and the first flow distribution window is arranged on the oil suction groove.

Specifically, the joints of the two ends of the main shaft 1 and the shell 8 are rotatably connected through bearing end covers fixed on the shell 8; the central through hole of the swash plate is arranged in the middle of the swash plate 3 and enables the main shaft 1 to pass through.

In the use state: when the axial plunger pump works, the motor drives the spindle 1 to rotate, the spindle 1 is connected with the cylinder body 2 through a spline between the spindle 1 and the cylinder body 2 to drive the plunger 6 to rotate around the axis of the cylinder body 2, and the plunger 6 changes with the volume of a closed volume cavity formed by a plunger through hole and the plunger 6 due to the existence of the swash plate 3 in the rotating process, so that the oil suction and discharge process is realized in a flow distribution window on the swash plate 3.

Specifically, referring to fig. 2 and 3, the oil suction area of the port plate is provided with a first port window 14, and the oil discharge area of the port plate is provided with a second port window 15; the second dispensing window 15 is isolated from the first dispensing window 14. The second flow distribution window 15 is isolated from the first flow distribution window 14, i.e. the second flow distribution window 15 is not in communication with the first flow distribution window 14. At this time, the first port window 14 is an oil suction window, the second port window 15 is an oil discharge window, the top dead center transition region is a transition region from the first port window 14 to the second port window 15 of the port plate, and the bottom dead center transition region is a transition region from the second port window 15 to the first port window 14. The first flow distribution window is arranged on the left side of the circumference of the flow distribution plate, and the second flow distribution window is arranged on the right side of the circumference of the flow distribution plate.

In an alternative embodiment, see fig. 2 and 3, the first damping orifice 11 is located in the region of the top dead centre transition close to the first port 14 and the second damping orifice is located in the region of the bottom dead centre transition close to the second port 15.

In the present embodiment, the first orifice 11 is located in the top dead center transition region near the first port 14, which means that the first orifice 11 is closer to the first port 14 than to the second port 15; the second damping orifice 12 is located in the region of the bottom dead center transition region close to the second port 15, meaning that the second damping orifice 12 is closer to the second port 15 than to the first port 14.

In an alternative embodiment, the first damping hole and the second damping hole are separated by a first time phase difference, and the first time phase difference is the time phase difference of the plunger entering the oil suction area and the oil discharge area.

Referring to fig. 4, the time phase difference of the plunger entering the oil suction area and the oil discharge area refers to: the time phase difference of the oil absorption plunger 17 entering the oil absorption area and the oil discharge plunger 18 entering the oil discharge area is that the oil absorption plunger and the oil discharge plunger are two different plungers rotating along with the main shaft, the number of the plungers is n, the interval angle of each plunger is 360 degrees/n, and the time phase difference of the plungers entering the oil absorption area and the oil discharge area is obtained by multiplying the interval angle by the number of the plungers. The time phase difference determines the distance angle a between the two damping holes, wherein in the present embodiment, the number of the plungers is an odd number, for example, when the number of the plungers is 9, each plunger interval angle is 360 °/9 ═ 40 °, the number of the plungers is 4 or 5, and the time phase difference when the plungers enter the oil suction area and the oil discharge area is 160 ° or 200 °, that is, the interval angle between the first damping hole and the second damping hole is set to be about 160 ° or about 200 °.

In an optional embodiment, the first oil passage is positioned inside the valve plate, and the first damping hole and the second damping hole are blind holes with the diameter of 0.5mm-5 mm.

In an optional embodiment, the first oil passage is located on the lower surface of the port plate, and the first damping hole and the second damping hole are through holes with diameters of 0.5mm-5 mm.

In an alternative embodiment, referring to fig. 3, a check valve 16 is provided in the first oil passage 13 for allowing oil in the first oil passage 13 to flow only from the second orifice 12 to the first orifice 11. The check valve 16 prevents the oil in the first orifice 11 from flowing back to the second orifice 12.

In an optional embodiment, the port plate includes a first port plate body and a second port plate body, a first groove is disposed on a side of the first port plate body facing the second port plate body, a second groove is disposed on a side of the second port plate body facing the first port plate body, and the first groove and the second groove cooperate to form the first oil passage.

At this time, the first oil passage of the port plate can be opened according to the following method: the valve plate is divided into an upper part and a lower part for processing, the upper part and the lower part are respectively milled with grooves, a first oil path channel is formed after compounding, and a one-way valve is arranged.

In an optional embodiment, the first oil passage is located on the lower surface of the port plate, and the lower surface of the port plate is provided with a third groove for forming the first oil passage by matching with the inner surface of the shell.

At this time, the first oil passage of the port plate can be opened according to the following method: grooves are respectively milled on the lower surface of the valve plate and the inner surface of the shell end cover, a first oil passage is formed after compounding, and a one-way valve is arranged.

The embodiment also discloses an axial plunger pump with the valve plate, and the axial plunger pump is provided with the valve plate in any one of the embodiments of the application.

In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of illustration of the disclosure and are not intended to limit the scope of the disclosure. Other variations or modifications may occur to those skilled in the art, based on the foregoing disclosure, and are still within the scope of the present disclosure.

Claims (9)

1. An axial piston pump with an orifice plate having orifices communicating with each other, comprising an orifice plate, wherein said orifice plate comprises:

a first orifice disposed in the top-dead-center transition region;

the second damping hole is arranged in the transition region of the bottom dead center;

and the first oil passage is arranged in the valve plate or on the lower surface of the valve plate and is used for communicating the first damping hole with the second damping hole.

2. The axial plunger pump of claim 1, wherein a check valve is disposed in the first oil passage for allowing oil in the first oil passage to flow only from the second orifice to the first orifice.

3. The axial plunger pump of claim 1, wherein the port plate oil suction area is provided with a first port window, and the port plate oil discharge area is provided with a second port window, the second port window being isolated from the first port window.

4. The axial piston pump as recited in claim 3, wherein said first orifice is located in a region of said top dead center transition region proximate a first port window and said second orifice is located in a region of said bottom dead center transition region proximate a second port window.

5. The axial plunger pump of claim 3, wherein the first orifice is angularly spaced from the second orifice by a first time phase difference, the first time phase difference being a time phase difference between the entry of the plunger into the suction area and the discharge area.

6. The axial plunger pump of claim 1, wherein the first oil passage is located inside the port plate, and the first and second damping holes are blind holes each having a diameter of 0.5mm to 5 mm.

7. The axial plunger pump of claim 1, wherein the first oil passage is located inside the port plate, the port plate includes a first port plate body and a second port plate body, the first port plate body is provided with a first groove on a side facing the second port plate body, the second port plate body is provided with a second groove on a side facing the first port plate body, and the first groove and the second groove cooperate to form the first oil passage.

8. The axial plunger pump of claim 1, wherein the axial plunger pump includes a housing, the first oil passage is located on a lower surface of a port plate, the lower surface of the port plate is provided with a third groove for forming the first oil passage in cooperation with an inner surface of the housing.

9. The axial piston pump as recited in claim 1, including a main shaft, a cylinder block, a swash plate, a slipper wear plate, a slipper, a piston, a housing, and a bearing;

the two ends of the main shaft are rotatably connected with the shell through the bearings;

the main shaft penetrates through the cylinder body and is connected with the cylinder body through a spline;

one end of the cylinder body is provided with the valve plate, and the other end of the cylinder body is provided with the swash plate;

the cylinder body is provided with a plurality of plunger through holes which are uniformly distributed around the axis of the cylinder body, one end of the plunger axially penetrates into the plunger through hole, the other end of the plunger is connected with one end of the sliding shoe, and the other end of the sliding shoe is connected with the sliding shoe wear-resisting plate.

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