阅读说明：本技术 一种高压柱塞泵 (High-pressure plunger pump ) 是由 王振华 李辉 高梅柱 苏龙 陈浩 于 2020-12-10 设计创作，主要内容包括：本发明公开一种高压柱塞泵,包括主轴、端盖、壳体、斜盘组件、回程盘、滑靴、缸体、柱塞、配油盘、变量活塞单元,通过在缸体上设置合理尺寸的吸排油窗,在配油盘设置合理尺寸的吸油窗,控制液压油在泵流道内的压力损失,保证了进入缸体内的液体压力大于液体的气化压；与此同时,将斜盘组件包括主斜盘和副斜盘,副斜盘采用特定材料制成,与滑靴形成匹配良好的运动副,副斜盘损坏后容易更换,降低了维护使用成本。另外,本发明在斜盘组件与壳体之间设置了变量活塞单元,变量活塞单元包括双关节组件,双关节组件中的大活塞杆一端与活塞压板铰接,另一端与大活塞铰接,使得变量过程中推动斜盘组件顺畅不卡滞,提高柱塞泵的可靠性。(The invention discloses a high-pressure plunger pump, which comprises a main shaft, an end cover, a shell, a swash plate assembly, a return plate, a piston shoe, a cylinder body, a plunger, an oil distribution disc and a variable piston unit, wherein an oil suction and discharge window with reasonable size is arranged on the cylinder body, and an oil suction window with reasonable size is arranged on the oil distribution disc, so that the pressure loss of hydraulic oil in a pump flow passage is controlled, and the pressure of liquid entering the cylinder body is ensured to be greater than the gasification pressure of the liquid; meanwhile, the swash plate assembly comprises a main swash plate and an auxiliary swash plate, the auxiliary swash plate is made of specific materials and forms a kinematic pair well matched with the slipper, the auxiliary swash plate is easy to replace after being damaged, and the maintenance and use cost is reduced. In addition, a variable piston unit is arranged between the swash plate assembly and the shell and comprises a double-joint assembly, one end of a large piston rod in the double-joint assembly is hinged with the piston pressing plate, and the other end of the large piston rod is hinged with the large piston, so that the swash plate assembly is pushed smoothly and is not clamped in the variable process, and the reliability of the plunger pump is improved.)

1. A high pressure plunger pump, characterized by: the oil distribution device comprises a main shaft, an end cover, a shell, a swash plate assembly, a return plate, a piston shoe, a cylinder body, a plunger, an oil distribution disc and a variable piston unit, wherein the main shaft can be in transmission connection with an external power element, the end cover is detachably connected with the shell, the swash plate assembly, the return plate, the cylinder body and the oil distribution disc are all arranged in a cavity defined by the end cover and the shell, the swash plate assembly, the return plate and the cylinder body are all sleeved outside the main shaft, the piston shoe is slidably connected with the swash plate assembly, the return plate can tightly press the piston shoe on the swash plate assembly, one end of the cylinder body close to the swash plate assembly is provided with a ball hinge, the ball hinge is rotatably connected with the return plate, the cylinder body and the ball hinge are both connected with the main shaft through splines, the inside of the cylinder body is provided with the plunger cavity, and the axis of the plunger cavity is parallel, the plunger is slidably arranged in the plunger cavity, one end of the plunger, which is far away from the cylinder body, is hinged with the sliding shoe, the oil distribution disc is arranged between the cylinder body and the shell, the oil distribution disc is provided with an oil suction window and an oil discharge window, the plunger cavity is provided with an oil suction and discharge window, the oil suction window and the oil discharge window can be communicated with the oil suction and discharge window, and the shell is provided with an oil suction port and an oil outlet which can be communicated with the plunger cavity;

the swash plate assembly comprises a main swash plate and an auxiliary swash plate, the main swash plate is detachably connected with the auxiliary swash plate, the auxiliary swash plate is arranged on one side of the main swash plate close to the cylinder body, and the auxiliary swash plate is abutted to the sliding shoes;

the variable piston unit comprises a double-joint assembly, the double-joint assembly comprises a large piston, a large piston rod and a piston pressing plate, the large piston is slidably connected with the shell, the large piston is hinged and connected with one end of the large piston rod to form a joint structure, the other end of the large piston rod is hinged and connected with the piston pressing plate to form a joint structure, and the piston pressing plate is connected with the swash plate assembly.

2. The high-pressure plunger pump according to claim 1, characterized in that: the oil suction window is an arc-shaped hole, and the oil suction and discharge window is an oval hole.

3. The high-pressure plunger pump according to claim 1, characterized in that: the main swash plate with vice swash plate stack sets up, vice swash plate is made by alloy steel material, the main swash plate is made by cast iron material.

4. The high-pressure plunger pump according to claim 1, characterized in that: the variable piston unit further comprises a small piston, the piston pressing plate is arranged between the small piston and the swash plate assembly, the small piston is hinged with the piston pressing plate, the other end of the small piston is slidably connected with the shell, and the large piston and the small piston are respectively arranged on two opposite sides of the main shaft.

5. The high-pressure plunger pump according to claim 1, characterized in that: the abutting surface of the cylinder body and the oil distribution disc is a cambered surface.

6. The high-pressure plunger pump according to claim 1, characterized in that: the bearing comprises a main shaft, an end cover, a cylinder body, a spherical hinge and a spring, wherein a large bearing is arranged between the main shaft and the end cover, a small bearing is arranged between the main shaft and the shell, the spring is arranged between the cylinder body and the spherical hinge and is in a compressed state, and the deformation direction of the spring is parallel to the axis of the main shaft.

7. The high-pressure plunger pump according to claim 1, characterized in that: the shell is provided with a large piston cavity, the large piston is slidably arranged in the large piston cavity, and a large piston cavity pressure measuring port is further arranged on the shell.

8. The high-pressure plunger pump according to claim 1, characterized in that: the oil drainage structure is characterized in that oil drainage holes are formed in the end cover and the shell, lifting ring mounting holes are formed in the shell, the oil drainage holes are communicated with the end cover and a cavity formed by the shell in an enclosed mode, lifting rings can be mounted in the lifting ring mounting holes, and weight reduction grooves are further formed in the end cover.

Technical Field

The invention relates to the technical field of hydraulic system equipment and peripheral supporting facilities thereof, in particular to a high-pressure plunger pump.

Background

The plunger pump is an important device of the hydraulic system. The plunger reciprocates in the cylinder body to change the volume of the sealed working cavity so as to absorb and press oil. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency, convenient flow regulation and the like, and is widely applied to occasions with high pressure, large flow and flow needing regulation, such as hydraulic machines, engineering machinery and ships. The high-pressure plunger pump is generally used at a pressure of 10MPa-100 MPa. It belongs to a positive displacement pump, and achieves the purpose of conveying liquid by means of the periodic change of the volume in a working cavity.

The plunger pump has the advantages of stable operation and high working efficiency, but has more complex structure, higher manufacturing cost and high maintenance and replacement cost.

Therefore, how to improve the reliability of the plunger pump becomes a problem to be solved by those skilled in the art.

Disclosure of Invention

The invention aims to provide a high-pressure plunger pump, which aims to solve the problems in the prior art, improve the reliability of the plunger pump and reduce the use cost of the plunger pump.

In order to achieve the purpose, the invention provides the following scheme: the invention provides a high-pressure plunger pump, which comprises a main shaft, an end cover, a shell, a swash plate assembly, a return plate, a piston shoe, a cylinder body, a plunger, an oil distribution disc and a variable piston unit, wherein the main shaft can be in transmission connection with an external power element, the end cover is detachably connected with the shell, the swash plate assembly, the return plate, the cylinder body and the oil distribution disc are all arranged in a cavity defined by the end cover and the shell, the swash plate assembly, the return plate and the cylinder body are all sleeved outside the main shaft, the piston shoe is slidably connected with the swash plate assembly, the return plate can tightly press the piston shoe on the swash plate assembly, one end of the cylinder body close to the swash plate assembly is provided with a spherical hinge, the spherical hinge is rotatably connected with the return plate, the cylinder body and the spherical hinge are both connected with the main shaft through splines, and the plunger cavity is arranged in the cylinder body, the axis of the plunger cavity is parallel to the axis of the cylinder body, the plunger is slidably arranged in the plunger cavity, one end, far away from the cylinder body, of the plunger is hinged with the sliding shoe, the oil distribution disc is arranged between the cylinder body and the shell, the oil distribution disc is provided with an oil suction window and an oil discharge window, the plunger cavity is provided with an oil suction and discharge window, the oil suction window, the oil discharge window and the oil discharge window can be communicated with the oil suction and discharge window, and the shell is provided with an oil suction port and an oil outlet which can be communicated with the plunger cavity;

the swash plate assembly comprises a main swash plate and an auxiliary swash plate, the main swash plate is detachably connected with the auxiliary swash plate, the auxiliary swash plate is arranged on one side of the main swash plate close to the cylinder body, and the auxiliary swash plate is abutted to the sliding shoes;

the variable piston unit comprises a double-joint assembly, the double-joint assembly comprises a large piston, a large piston rod and a piston pressing plate, the large piston is slidably connected with the shell, the large piston is hinged with one end of the large piston rod to form a joint structure, and the other end of the large piston rod is hinged with the piston pressing plate to form the joint structure.

Preferably, the oil suction window is an arc-shaped hole, and the oil suction and discharge window is an oval hole.

Preferably, the main swash plate and the auxiliary swash plate are arranged in an overlapping mode, the auxiliary swash plate is made of alloy steel, and the main swash plate is made of cast iron.

Preferably, the variable piston unit further comprises a small piston, the piston pressure plate is arranged between the small piston and the swash plate assembly, the small piston is hinged to the piston pressure plate, the other end of the small piston is slidably connected to the housing, and the large piston and the small piston are respectively arranged on two opposite sides of the main shaft.

Preferably, the abutting surface of the cylinder body and the oil distribution disc is an arc surface.

Preferably, a large bearing is arranged between the main shaft and the end cover, a small bearing is arranged between the main shaft and the shell, a spring is arranged between the cylinder body and the spherical hinge, the spring is in a compressed state, and the deformation direction of the spring is parallel to the axis of the main shaft.

Preferably, the housing has a large piston chamber, the large piston is slidably disposed in the large piston chamber, and a large piston chamber pressure port is further disposed on the housing.

Preferably, the end cover and the shell are both provided with oil drainage holes, the shell is provided with hanging ring mounting holes, the oil drainage holes are communicated with a cavity formed by the end cover and the shell, hanging rings can be mounted in the hanging ring mounting holes, and the end cover is further provided with weight reduction grooves.

Compared with the prior art, the invention has the following technical effects: the invention relates to a high-pressure plunger pump, which comprises a main shaft, an end cover, a shell, a swash plate component, a return plate, a piston shoe, a cylinder body, a plunger, an oil distribution disc and a variable piston unit, wherein the main shaft can be in transmission connection with an external power element, the end cover is detachably connected with the shell, the swash plate component, the return plate, the cylinder body and the oil distribution disc are all arranged in a cavity defined by the end cover and the shell, the swash plate component, the return plate and the cylinder body are all sleeved outside the main shaft, the piston shoe is slidably connected with the swash plate component, the return plate can press the piston shoe on the swash plate component, one end of the cylinder body close to the swash plate component is provided with a ball hinge, the ball hinge is rotatably connected with the return plate, the cylinder body and the ball hinge are both connected with the main shaft through splines, a plunger cavity is arranged in the cylinder body, the oil distribution disc is arranged between the cylinder body and the shell, the oil distribution disc is provided with an oil suction window and an oil discharge window, the plunger cavity is provided with an oil suction and discharge window, the area of the oil suction window is larger than that of the oil suction and discharge window, the oil suction window and the oil discharge window can be communicated with the oil suction and discharge window, and the shell is provided with an oil suction port and an oil outlet which can be communicated with the plunger cavity; the swash plate assembly comprises a main swash plate and an auxiliary swash plate, the main swash plate is detachably connected with the auxiliary swash plate, the auxiliary swash plate is arranged on one side of the main swash plate close to the cylinder body, and the auxiliary swash plate is abutted to the sliding shoes; the variable piston unit comprises a double-joint assembly, the double-joint assembly comprises a large piston, a large piston rod and a piston pressing plate, the large piston is slidably connected with the shell, the large piston is hinged and connected with one end of the large piston rod to form a joint structure, and the other end of the large piston rod is hinged and connected with the piston pressing plate to form the joint structure.

According to the high-pressure plunger pump, the oil suction and discharge window is arranged on the cylinder body, the oil suction window is arranged on the oil distribution disc, the pressure loss of hydraulic oil in a pump flow channel is controlled, the pressure of liquid entering the cylinder body is ensured to be larger than the gasification pressure of the liquid, the vibration and noise caused by cavitation are avoided, and the damage of parts caused by cavitation is avoided; meanwhile, the swash plate assembly is arranged to be of a split structure, the auxiliary swash plate is made of specific materials and forms a kinematic pair well matched with the sliding shoes, the auxiliary swash plate is easy to replace after being damaged, and the maintenance and use cost is reduced. In addition, the variable piston unit is arranged between the swash plate assembly and the shell and comprises the double-joint assembly and the small piston, so that the swash plate assembly is pushed smoothly without clamping stagnation in a variable process, and the reliability of the plunger pump is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic diagram of the high pressure plunger pump of the present invention;

FIG. 2 is a schematic sectional view of the high pressure plunger pump of the present invention;

FIG. 3 is a schematic structural view of a cylinder and an oil distribution pan of the high-pressure plunger pump of the present invention;

FIG. 4 is a schematic structural view of a swash plate assembly of the high pressure plunger pump of the present invention;

FIG. 5 is a schematic view of a portion of the dual joint assembly of the high pressure plunger pump of the present invention;

FIG. 6 is a schematic structural view of an end cap of the high pressure plunger pump of the present invention;

FIG. 7 is a schematic structural view of a housing of the high pressure plunger pump of the present invention;

FIG. 8 is a schematic view of the housing of the high pressure plunger pump of the present invention at another angle;

the hydraulic oil pump comprises a main shaft 1, an end cover 2, a shell 3, a swash plate assembly 4, a main swash plate 401, an auxiliary swash plate 402, a return plate 5, a piston shoe 6, a cylinder block 7, a plunger 8, an oil distribution disc 9, a small piston 10, a large piston 1001, a piston pressing plate 1002, a large piston rod 1003, a small piston 1004, a ball hinge 11, a plunger cavity 12, an oil suction and discharge window 13, an oil suction window 14, an oil suction port 15, an oil outlet 16, a large bearing 17, a small bearing 18, a spring 19, an oil drainage hole 20, a lifting ring mounting hole 21, a weight reduction groove 22, a maximum displacement limiting screw hole 23, a minimum displacement limiting screw hole 24, a control valve mounting surface 25, an oil inlet mounting surface 26, an oil outlet mounting surface 27 and a bolt mounting hole 28.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention aims to provide a high-pressure plunger pump, which aims to solve the problems in the prior art, improve the reliability of the plunger pump and reduce the use cost of the plunger pump.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

Referring to fig. 1 to 8, fig. 1 is a schematic structural diagram of a high-pressure plunger pump of the present invention, fig. 2 is a schematic sectional structural diagram of the high-pressure plunger pump of the present invention, fig. 3 is a schematic structural diagram of a cylinder block and an oil distribution pan of the high-pressure plunger pump of the present invention, fig. 4 is a schematic structural diagram of a swash plate assembly of the high-pressure plunger pump of the present invention, fig. 5 is a schematic partial structural diagram of a double joint assembly of the high-pressure plunger pump of the present invention, fig. 6 is a schematic structural diagram of an end cap of the high-pressure plunger pump of the present invention, fig. 7 is a schematic structural diagram of a housing of the high-pressure plunger pump of the present invention, and fig. 8 is a schematic structural diagram.

The invention provides a high-pressure plunger pump, which comprises a main shaft 1, an end cover 2, a shell 3, a swash plate assembly 4, a return plate 5, a piston shoe 6, a cylinder body 7, a plunger 8, an oil distribution disc 9 and a variable piston unit, wherein the main shaft 1 can be in transmission connection with an external power element, the end cover 2 is detachably connected with the shell 3, the swash plate assembly 4, the return plate 5, the cylinder body 7 and the oil distribution disc 9 are all arranged in a cavity defined by the end cover 2 and the shell 3, the swash plate assembly 4, the return plate 5 and the cylinder body 7 are all sleeved outside the main shaft 1, the piston shoe 6 is slidably connected with the swash plate assembly 4, the return plate 5 can press the piston shoe 6 on the swash plate assembly 4, one end of the cylinder body 7, close to the swash plate assembly 4, is provided with a spherical hinge 11, the spherical hinge 11 is rotatably connected with the return plate 5, the cylinder body 7 and the spherical hinge 11 are both connected with the main shaft 1 through splines, a plunger cavity, the plunger 8 is slidably arranged in a plunger cavity 12, one end of the plunger 8, which is far away from the cylinder body 7, is hinged with the sliding shoe 6, the oil distribution disc 9 is arranged between the cylinder body 7 and the shell 3, the oil distribution disc 9 is provided with an oil suction window 14, the plunger cavity 12 is provided with an oil suction and discharge window 13, the oil suction window 14 can be communicated with the oil suction and discharge window 13, and the shell 3 is provided with an oil suction port 15 and an oil outlet 16 which can be communicated with the plunger cavity 12.

The swash plate assembly 4 comprises a main swash plate 401 and an auxiliary swash plate 402, the main swash plate 401 and the auxiliary swash plate 402 are detachably connected, the assembly and disassembly are convenient, the auxiliary swash plate 402 is arranged on one side, close to the cylinder body 7, of the main swash plate 401, the auxiliary swash plate 402 is in butt joint with the sliding shoes 6, the auxiliary swash plate 402 is convenient to maintain and replace after being worn, and the maintenance cost of the plunger pump is reduced.

The variable piston unit comprises a double-joint assembly, the double-joint assembly comprises a large piston 1001, a piston pressing plate 1002 and a large piston rod 1003, the large piston 1001 is connected with the shell 3 in a sliding mode, the large piston 1001 is hinged with one end of the large piston rod 1003 to form a joint structure, the other end of the large piston rod 1003 is hinged with the piston pressing plate 1002 to form a joint structure, therefore, double joints are formed, the double-joint assembly pushes the swash plate assembly 4 to change the angle, and the variable effect of the plunger pump is achieved. The double-joint component overcomes the phenomenon of mechanical structure clamping stagnation in the variable process.

In order to improve the oil absorption performance of the plunger pump and reduce the probability of cavitation, the high-pressure plunger pump controls the pressure loss of hydraulic oil in a pump flow passage by arranging the oil absorption and discharge window 13 on the cylinder body 7 and the oil distribution disc 9 to ensure that the pressure of the liquid entering the cylinder body 7 is greater than the gasification pressure of the liquid, thereby avoiding the vibration and noise caused by cavitation and avoiding the damage of parts caused by cavitation; meanwhile, the swash plate assembly 4 is set to be a split structure, the auxiliary swash plate 402 is made of specific materials and forms a kinematic pair well matched with the sliding shoes 6, the auxiliary swash plate 402 is easy to replace after being damaged, and the maintenance and use cost is reduced. In addition, the double-joint assembly is arranged between the swash plate assembly 4 and the shell 3 and comprises a large piston 1001, a piston pressing plate 1002 and a large piston rod 1003, the swash plate assembly 4 can be pushed to change angles, one end of the large piston rod 1003 is hinged to the piston pressing plate 1002, and the other end of the large piston rod 1003 is hinged to the large piston 1001, so that the swash plate assembly 4 is pushed smoothly in a variable process without clamping stagnation, and the reliability of the plunger pump is improved.

Wherein, the oil suction window 14 is an arc hole similar to a waist-shaped hole, the oil suction and discharge window 13 is an elliptical hole, and the area of the oil suction window 14 is larger than that of the oil suction and discharge window 13. The reasonable flow area A1 of the oil suction and discharge window 13, the flow area A2 of the oil suction window 14 and the size of the reference circle radius r of the oil suction window 14 are obtained through calculation, and the values A1, A2 and r are reasonably configured to reduce the pressure loss of an internal flow passage, so that the self-priming performance of the plunger pump is improved. By calculating a reasonable r value, the linear velocity V of the flow distribution surface of the cylinder 7 is reduced, the value of [ PV ] is reduced, the PV value determines the temperature change, therefore, the value is reduced, namely, the possibility of the gluing of the flow distribution pair of the cylinder 7 is reduced, and the service life of the friction pair of the cylinder 7 and the oil distribution disc 9 is prolonged.

In this embodiment, the main swash plate 401 and the sub swash plate 402 are overlapped, and the sub swash plate 402 is made of alloy steel, and the alloy steel performance is excellent, so that the sub swash plate 402 and the kinematic pair of the slipper 6 have sufficient service life, and the main swash plate 401 is made of cast iron, so that the manufacturing cost is saved, and when the sub swash plate 402 goes wrong, the main swash plate 401 does not need to be replaced, and the maintenance and use cost is reduced.

Specifically, the variable piston unit further comprises a small piston 10, a piston pressing plate 1002 is also arranged between the small piston 10 and the swash plate assembly 4, the small piston 10 is hinged to the piston pressing plate 1002, the other end of the small piston 10 is slidably connected with the shell 3, the large piston 1001 and the small piston 10 are respectively arranged on two opposite sides of the main shaft 1 and are matched with each other to push the swash plate assembly 4 to change the angle, and the large piston 1001 and the small piston are located on two sides of the main shaft 1 to improve the stress uniformity of the swash plate assembly 4.

In addition, the abutting surfaces of the cylinder body 7 and the oil distribution disc 9 are cambered surfaces, so that the relative sliding between the cylinder body and the oil distribution disc is smoother, and a certain limiting effect can be achieved.

More specifically, a large bearing 17 is arranged between the main shaft 1 and the end cover 2, a small bearing 18 is arranged between the main shaft 1 and the housing 3, the large bearing 17 and the small bearing 18 respectively support two ends of the main shaft 1, a spring 19 is arranged between the cylinder body 7 and the spherical hinge 11, the spring 19 is in a compressed state, the deformation direction of the spring 19 is parallel to the axis of the main shaft 1, in the process that the main shaft 1 drives the cylinder body 7 to rotate, the spring 19 can generate axial force on the spherical hinge 11, the axial force is transmitted to the return disc 5 through the spherical hinge 11, and the return disc 5 forces the sliding shoe 6 to abut against the swash plate assembly 4. The plunger 8 moves circularly along with the cylinder 7 and reciprocates in the cylinder 7 to complete oil suction and discharge.

Further, the shell 3 is provided with a large piston cavity, the large piston 1001 is slidably arranged in the large piston cavity, a large piston cavity pressure measuring port is further formed in the shell 3, pressure of the large piston cavity can be monitored conveniently, in addition, a control valve mounting surface 25, an oil inlet mounting surface 26 and an oil outlet mounting surface 27 are further formed in the shell 3, the whole shape of the shell 3 is columnar, chamfering processing is conducted on non-mounting surfaces, the roundness of the shell 3 is improved, other components are prevented from being scratched or hurt to workers, meanwhile, the whole attractiveness of the device is improved, and a blank surface is formed on part of the non-mounting surfaces, so that the manufacturing process is simplified.

In addition, all be provided with bleeder hole 20 on end cover 2 and the casing 3, the rings mounting hole 21 has on the casing 3, bleeder hole 20 is linked together with the cavity that end cover 2, casing 3 enclose, rings can be installed to rings mounting hole 21, convenient hoist and mount, have its bolt mounting hole 28 of being connected the usefulness with casing 3 on the end cover 2, bolt mounting hole 28 department sets up lightening groove 22, alleviate the quality of end cover 2, reduction in production cost, the bolt through-hole when still having installation pump and bell jar on the end cover 2. The shell 3 is also provided with a maximum displacement limit screw hole 23 and a minimum displacement limit screw hole 24, and a blank surface can be formed on the non-mounting surface or the connecting surface outside the end cover 2 and the shell 3 without processing requirements, so that the manufacturing cost is saved.

According to the high-pressure plunger pump, the swash plate assembly 4 is of a split structure, the auxiliary swash plate 402 is made of a specific material and forms a kinematic pair well matched with the sliding shoes 6, the auxiliary swash plate 402 is easy to replace after being damaged, and the maintenance and use cost is reduced. Meanwhile, a variable piston unit is arranged between the swash plate assembly 4 and the shell 3, the variable piston unit comprises a double-joint assembly and a small piston 10, the double-joint assembly comprises a large piston 1001, a piston pressing plate 1002 and a large piston rod 1004, the swash plate assembly 4 can be pushed to convert angles, one end of the large piston rod 1003 is hinged with the piston pressing plate 1002, and the other end of the large piston rod 1003 is hinged with the large piston 1001, so that the swash plate assembly 4 is pushed smoothly in a variable process without clamping stagnation, and the reliability of the plunger pump is improved.

The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.