阅读说明：本技术 轴向柱塞泵或马达内部旋转组件搅拌损失测试装置 (Stirring loss testing device for internal rotating assembly of axial plunger pump or motor ) 是由 李莹 王鑫丞 张钊墉 张嘉方 张晋 孔祥东 于 2021-09-08 设计创作，主要内容包括：本发明涉及一种轴向柱塞泵或马达内部旋转组件搅拌损失测试装置,其包括上端壳体上端盖、上端壳体、上端轴承、压板、动密封环、动密封环密封圈、下端壳体、柱塞、下端斜盘、下端轴承、主轴、上端斜盘、滑靴、回程盘、缸体和上端壳体下端盖,上端壳体上下两端分别与上端壳体上端盖和上端壳体下端盖固定连接,中上部与上端轴承外表面相配合；下端壳体上部与上端壳体下部固定连接,中下部与下端轴承相配合；上端壳体和下端壳体组成的内部空间安装有缸体、主轴、柱塞、滑靴和回程盘。本发明实现对内部旋转组件搅拌损失的精确测量,单独测试柱塞和缸体搅油运动所引起的搅拌损失,润滑冷却状态良好,实现长时间工作,获取搅拌损失的长时变化规律。(The invention relates to a stirring loss testing device for an internal rotating assembly of an axial plunger pump or a motor, which comprises an upper end cover of an upper end shell, the upper end shell, an upper end bearing, a pressing plate, a movable sealing ring, a lower end shell, a plunger, a lower end swash plate, a lower end bearing, a main shaft, an upper end swash plate, a sliding shoe, a return plate, a cylinder body and an upper end shell lower end cover, wherein the upper end and the lower end of the upper end shell are respectively fixedly connected with the upper end cover of the upper end shell and the upper end shell lower end cover, and the middle upper part of the upper end shell is matched with the outer surface of the upper end bearing; the upper part of the lower end shell is fixedly connected with the lower part of the upper end shell, and the middle lower part of the lower end shell is matched with the lower end bearing; the inner space formed by the upper end shell and the lower end shell is provided with a cylinder body, a main shaft, a plunger, a sliding shoe and a return disc. The invention realizes the accurate measurement of the stirring loss of the internal rotating assembly, independently tests the stirring loss caused by the oil stirring motion of the plunger and the cylinder body, has good lubricating and cooling states, realizes long-time work, and obtains the long-time change rule of the stirring loss.)

1. An axial plunger pump or motor internal rotating assembly stirring loss testing device is characterized by comprising an upper end shell upper end cover, an upper end shell, an upper end bearing, a pressing plate, a movable sealing ring, a lower end shell, a plunger, a lower end swash plate, a lower end bearing, a main shaft, an upper end swash plate, a sliding shoe, a return plate, a cylinder body and an upper end shell lower end cover, wherein the upper end and the lower end of the upper end shell are fixedly connected with the upper end shell upper end cover and the upper end shell lower end cover through threads respectively; the inner surface of the upper part of the lower end shell is fixedly connected with the outer surface of the lower part of the upper end shell through threads, and the middle lower part of the lower end shell is matched with the lower end bearing through a support hole.

The outer surface of the upper part of the cylinder body is matched with the inner surface of the movable sealing ring, and a plunger is arranged on the circumference of the cylinder body through a cylinder hole; the middle upper part of the main shaft is fixedly connected with the upper surface of the cylinder body through threads, the outer surface of the middle part of the main shaft is connected with the inner surface of a central hole of the cylinder body through a spline, and the outer surfaces of the upper part and the lower part of the main shaft are respectively supported by the inner surfaces of the upper end bearing and the lower end bearing; the upper surface of the upper end swash plate is connected with the lower surface of the middle part of the upper end shell through a pin, and the lower surface of the lower end swash plate is connected with the upper surface of the middle part of the lower end shell through a pin; the upper side of the return disc presses the sliding shoes on the lower surface of the upper end swash plate through holes, and the lower outer edge of the return disc is limited by the lower end of the pressing plate; the pressure plate is connected with the outer end of the lower surface of the upper end swash plate through threads and controls the degree of freedom of the return plate through a constant gap, and the lower side of the sliding shoe is connected with the upper end of the plunger through a spherical hinge.

2. The stirring loss testing device for internal rotating assemblies of axial plunger pumps or motors as claimed in claim 1, wherein the upper end of the plunger is of a ball head structure, the lower end of the plunger is of a hemispherical structure and is not in contact with the upper surface of the lower end swash plate, the upper half part of the plunger is in transition fit with the cylinder holes of the cylinder block, and the lower half part of the plunger is slightly smaller in diameter than the upper half part of the plunger and is in clearance fit with the cylinder holes of the cylinder block; the length of the upper half part of the plunger in the cylinder hole of the cylinder body is larger than the maximum length of the upper end face of the cylinder body extending outwards, and the length of the lower half part of the plunger in the cylinder hole of the cylinder body is larger than the maximum length of the lower end face of the cylinder body extending outwards.

3. The stirring loss testing device for internal rotating assemblies of axial plunger pumps or motors as claimed in claim 1, wherein the cylinder body is a cylinder, the circumference of the cylinder body is uniformly provided with 9 cylinder holes for mounting 9 plungers, and the return disk is provided with 9 corresponding holes for pressing the sliding shoes connected with the upper ends of the 9 plungers through spherical hinges.

4. The apparatus for testing the stirring loss of an internal rotating component of an axial plunger pump or motor according to claim 1, wherein the inclination angles of the upper end swash plate and the lower end swash plate are both 17 °, the upper end swash plate limits the displacement of the plungers, so as to ensure that the plungers perform a combined motion of both rotation and reciprocation under the driving of the rotation of the main shaft and the cylinder block, and the combined motion ensures that the lower ends of 9 plungers are always positioned on an inclined plane which is at an inclination angle of 17 ° and is parallel to and not coincident with the inclined plane at the upper part of the lower end swash plate.

5. The device for testing the stirring loss of the internal rotating assembly of the axial plunger pump or the motor as claimed in claim 1, wherein an oil port a is formed at the lower end of the diameter-variable part of the side wall of the upper housing at the same level as the upper surface of the upper swash plate, and an oil port 1, an oil port 2 and an oil port 3 are respectively formed at the position of the lower side and the middle part of the chamfer at the diameter-variable part of the upper part of the side wall of the lower housing at the same level as the lower end of the cylinder body and the position of the lower part and the lower end of the lower swash plate at the same level as the lower end of the cylinder body.

6. The apparatus for testing agitation loss of an internal rotating assembly of an axial plunger pump or motor according to claim 1, wherein a through hole through which the main shaft passes is left between the upper end cover of the upper end housing, the upper end swash plate and the lower end swash plate and is in clearance fit with the main shaft, the upper end cover seal ring is embedded between the outer surface of the lower part of the upper end cover of the upper end housing and the inner surface of the upper part of the upper end housing, and the dynamic seal ring is embedded between the inner surface of the dynamic seal ring and the outer surface of the upper part of the cylinder block.

7. The apparatus for testing the stirring loss of an internal rotating assembly of an axial plunger pump or a motor according to claim 1, wherein the pressure plate is of an L-shaped structure, and the slipper is of a truncated cone structure.

8. The axial plunger pump or motor internal rotating assembly stirring loss testing device of claim 1, wherein the main shaft is of an eight-section stepped shaft structure, and the shaft diameter changes from top to bottom:

d₈<d₇＝d₄<d₆<d₁<d₂<d₅<d₃ (1)

wherein: d_iRepresents the i-th section axis, i is 1-8; the section i shaft i is not equal to 6 and is an optical axis, and a spline is arranged at the upper part of the section 6 shaft; the upper part of the 1 st section shaft is in clearance fit with the inner surface of the upper end cover of the upper end shell, the 2 nd section shaft is in clearance fit with the inner surface of the middle part of the upper end shell, the 3 rd section shaft is in clearance fit with the inner surface of the upper end swash plate, the upper surface of the 5 th section shaft is provided with a threaded through hole and is fixedly connected with the upper surface of the cylinder body through threads, and the 7 th section shaft is in clearance fit with the inner surface of the lower end swash plate; the 1 st section of axle lower extreme is installed the upper end bearing, the 6 th section of axle fixed mounting have the cylinder body, install on the 8 th section of axle the lower extreme bearing.

Technical Field

The invention belongs to the technology of hydraulic elements, and particularly relates to a stirring loss testing device for an internal rotating assembly of an axial plunger pump or a motor.

Background

The axial plunger pump has the advantages of high working efficiency, multiple variable forms, long service life and the like, is one of the most widely applied power sources of the fluid transmission system, and is widely applied to the engineering fields of buildings, roads, transportation, national defense and the like. With the continuous development of the aerospace field, the requirement for high power density of applied elements is higher and higher, and increasing the rotating speed is an effective way to achieve high power density of the pump. However, the high speed increases the stirring losses caused by the stirring movement of the rotating element inside the axial plunger pump housing significantly. Experiments and numerical studies show that when the axial plunger pump runs at a high speed, stirring loss caused by oil stirring movement of a rotating component in the shell becomes one of important power loss sources. Therefore, the method has important significance for researching and testing the stirring loss of the internal rotating component of the axial plunger pump or the motor.

For the research of the stirring loss, at present, a mathematical model is mainly established, and the model is optimized and theoretically analyzed through simulation calculation, but at present, related experimental researches are few, and the influence of the reciprocating motion of the plunger on the stirring loss is mostly ignored, and the experimental researches mainly face the following difficulties:

1. it is difficult to take off the effects of other sources of power loss. The stirring loss generated by the oil stirring movement of the high-speed axial plunger pump rotating assembly is mainly represented by the torque loss acting on the main shaft, and the oil stirring loss of the high-speed rotating assembly is determined by comparing the torque difference between the case filled with oil and the case without oil inside the case. However, the axial plunger pump has a complex structure, a large number of parts and close matching, so that the difference of lubrication states between the case of filling oil liquid and the case of no oil liquid in the case of filling the case is large, and the friction loss torque is difficult to peel off by making the torque difference, thereby being difficult to accurately obtain the stirring loss torque.

2. The stirring loss can be only tested for a short time, and the long-term change rule can not be obtained. The axial plunger pump is a hydraulic element with a highly compact structure, and when the stirring loss is tested, the axial plunger pump inevitably needs to run at a high speed in an oil-free state in a shell, and only can work for a short time to obtain a torque value under the working condition in consideration of the friction and the abrasion of elements in the pump and the safety of experiment operators, so that the long-term change rule that the stirring loss cannot be obtained is directly caused.

Therefore, it is necessary and urgent to design a device for testing the stirring loss of the internal rotating component of the axial plunger pump or the motor to solve the problem of the difficulty in testing the stirring loss of the internal rotating component of the axial plunger pump or the motor.

Disclosure of Invention

In view of the above circumstances, the invention provides a stirring loss testing device for an internal rotating assembly of an axial plunger pump or a motor, which comprises an upper end cover of an upper end shell, the upper end shell, an upper end bearing, a pressing plate, a movable sealing ring, a lower end shell, a plunger, a lower end swash plate, a lower end bearing, a main shaft, the upper end swash plate, a sliding shoe, a return plate, a cylinder body and a lower end cover of the upper end shell, wherein the upper end and the lower end of the upper end shell are respectively and fixedly connected with the upper end cover of the upper end shell and the lower end cover of the upper end shell, and the middle upper part of the upper end shell is matched with the outer surface of the upper end bearing; the upper part of the lower end shell is fixedly connected with the lower part of the upper end shell, and the middle lower part of the lower end shell is matched with the lower end bearing; the inner space formed by the upper end shell and the lower end shell is provided with a cylinder body, a main shaft, a plunger, a sliding shoe and a return disc. The invention can realize accurate measurement of the stirring loss of the internal rotating assembly, independently test the stirring loss caused by oil stirring movement of the plunger and the cylinder body, has good lubricating and cooling states, realizes long-time work, and obtains the long-time change rule of the stirring loss.

The invention provides a stirring loss testing device for an internal rotating assembly of an axial plunger pump or a motor, which comprises an upper end cover of an upper end shell, the upper end shell, an upper end bearing, a pressing plate, a movable sealing ring, a lower end shell, a plunger, a lower end swash plate, a lower end bearing, a main shaft, an upper end swash plate, a sliding shoe, a return plate, a cylinder body and a lower end cover of the upper end shell, wherein the upper end and the lower end of the upper end shell are fixedly connected with the upper end cover of the upper end shell and the lower end cover of the upper end shell through threads respectively; the inner surface of the upper part of the lower end shell is fixedly connected with the outer surface of the lower part of the upper end shell through threads, and the middle lower part of the lower end shell is matched with the lower end bearing through a support hole; the outer surface of the upper part of the cylinder body is matched with the inner surface of the movable sealing ring, and a plunger is arranged on the circumference of the cylinder body through a cylinder hole; the middle upper part of the main shaft is fixedly connected with the upper surface of the cylinder body through threads, the outer surface of the middle part of the main shaft is connected with the inner surface of a central hole of the cylinder body through a spline, and the outer surfaces of the upper part and the lower part of the main shaft are respectively supported by the inner surfaces of the upper end bearing and the lower end bearing; the upper surface of the upper end swash plate is connected with the lower surface of the middle part of the upper end shell through a pin, and the lower surface of the lower end swash plate is connected with the upper surface of the middle part of the lower end shell through a pin; the upper side of the return disc presses the sliding shoes on the lower surface of the upper end swash plate through holes, and the lower outer edge of the return disc is limited by the lower end of the pressing plate; the pressure plate is connected with the outer end of the lower surface of the upper end swash plate through threads and controls the degree of freedom of the return plate through a constant gap, and the lower side of the sliding shoe is connected with the upper end of the plunger through a spherical hinge.

Furthermore, the upper end of the plunger is of a ball head structure, the lower end of the plunger is of a hemispherical structure and is not contacted with the upper surface of the lower end swash plate, the upper half part of the plunger is in transition fit with the cylinder hole of the cylinder block, and the diameter of the lower half part of the plunger is slightly smaller than that of the upper half part of the plunger and is in clearance fit with the cylinder hole of the cylinder block; the length of the upper half part of the plunger in the cylinder hole of the cylinder body is larger than the maximum length of the upper end face of the cylinder body extending outwards, and the length of the lower half part of the plunger in the cylinder hole of the cylinder body is larger than the maximum length of the lower end face of the cylinder body extending outwards.

Preferably, the cylinder body is a cylinder, 9 cylinder holes for mounting 9 plungers are uniformly distributed on the circumference of the cylinder body, and 9 corresponding holes are formed in the return disc so as to press the sliding shoes connected with the upper ends of the 9 plungers through spherical hinges.

Preferably, the inclination angles of the upper end swash plate and the lower end swash plate are both 17 degrees, the upper end swash plate limits the displacement of the plungers, so that the plungers are driven by the rotation of the main shaft and the cylinder body to do the composite motion of rotation and reciprocation, and the composite motion ensures that 9 lower ends of the plungers are always positioned on the inclined planes which are 17 degrees inclination angles and parallel to and not coincident with the inclined plane at the upper part of the lower end swash plate.

Further, the lower end of the diameter-changing part of the side wall of the upper end shell and the same horizontal height position of the upper surface of the upper end swash plate are provided with an oil port A, and the lower side and the middle of the chamfer of the diameter-changing part of the upper part of the side wall of the lower end shell and the same horizontal height position of the lower end of the cylinder body and the same horizontal height position of the lower end swash plate are respectively provided with an oil port 1, an oil port 2 and an oil port 3.

Preferably, a through hole through which the main shaft passes is reserved among the upper end housing upper end cover, the upper end swash plate and the lower end swash plate, the through hole is in clearance fit with the main shaft, a sealing ring of the upper end housing upper end cover is embedded between the outer surface of the upper end housing upper end cover lower part and the inner surface of the upper end housing upper part, and a sealing ring of the dynamic sealing ring is embedded between the inner surface of the dynamic sealing ring and the outer surface of the upper part of the cylinder body.

Preferably, the pressure plate is of an L-shaped structure, and the slipper is of a circular truncated cone structure.

Preferably, the main shaft is of an eight-section stepped shaft structure, and the shaft diameter changes from top to bottom:

d₈<d₇＝d₄<d₆<d₁<d₂<d₅<d₃ (1)

wherein: d_iRepresents the i-th section axis, i is 1-8; the section i shaft i is not equal to 6 and is an optical axis, and a spline is arranged at the upper part of the section 6 shaft; the upper part of the 1 st section shaft is in clearance fit with the inner surface of the upper end cover of the upper end shell, the 2 nd section shaft is in clearance fit with the inner surface of the middle part of the upper end shell, the 3 rd section shaft is in clearance fit with the inner surface of the upper end swash plate, the upper surface of the 5 th section shaft is provided with a threaded through hole and is fixedly connected with the upper surface of the cylinder body through threads, and the 7 th section shaft is in clearance fit with the inner surface of the lower end swash plate; the 1 st section of axle lower extreme is installed the upper end bearing, the 6 th section of axle fixed mounting have the cylinder body, install on the 8 th section of axle the lower extreme bearing.

The invention has the characteristics and beneficial effects that:

1. the stirring loss testing device for the internal rotating assembly of the axial plunger pump or the motor provided by the invention has the advantage of realizing accurate measurement of the stirring loss of the internal rotating assembly of the axial plunger pump or the motor due to the successful peeling friction influence.

2. The stirring loss testing device for the internal rotating assembly of the axial plunger pump or the motor has the advantage that due to the arrangement of the oil port, the independent testing of the stirring loss caused by the oil stirring motion of the internal plunger and the cylinder body of the axial plunger pump or the motor is realized.

3. The stirring loss testing device for the rotating assembly in the axial plunger pump or the motor has the advantages that due to the double-shell structure, the inner part of the upper-end shell, namely the driving part, can be always in a state of being filled with oil liquid, the lubricating and cooling states are good, long-time work is realized, and the long-term change rule of stirring loss is obtained.

Drawings

FIG. 1 is a block diagram of an axial piston pump or motor internal rotating assembly agitation loss test apparatus of the present invention;

FIG. 2 is an external view of the stirring loss test device of the internal rotating assembly of the axial piston pump or motor of the present invention;

FIG. 3 is an enlarged view of the slipper plunger structure of the present invention;

FIG. 4 is a diagram of the internal core components of the axial piston pump or motor internal rotating assembly agitation loss testing apparatus of the present invention.

In the figure:

1-upper end cover of upper end shell; 2-sealing ring of upper end cover of upper end shell; 3-upper end shell; 4-upper end bearing; 5, pressing a plate; 6-moving a sealing ring; 7-dynamic sealing ring; 8-a lower end housing; 9-a plunger; 10-a lower end swash plate; 11-lower end bearing; 12-a main shaft; 13-an upper end swash plate; 14-a slipper; 15-a return disc; 16-cylinder body; 17-upper end housing lower end cap.

Detailed Description

The technical contents, structural features, attained objects and effects of the present invention are explained in detail below with reference to the accompanying drawings.

The invention provides a stirring loss testing device for an internal rotating assembly of an axial plunger pump or a motor, which comprises an upper end cover 1 of an upper end shell, an upper end shell 3, an upper end bearing 4, a pressure plate 5, a movable sealing ring 6, a movable sealing ring 7, a lower end shell 8, a plunger 9, a lower end swash plate 10, a lower end bearing 11, a main shaft 12, an upper end swash plate 13, a sliding shoe 14, a return plate 15, a cylinder body 16 and an upper end shell lower end cover 17, wherein the upper end and the lower end of the upper end shell 3 are fixedly connected with the upper end cover 1 of the upper end shell and the upper end shell lower end cover 17 through threads respectively, the inner surface of the middle upper part is matched with the outer surface of the upper end bearing 4 through a supporting hole, the inner surface of the lower part is matched with the outer surface of the movable sealing ring 6 through the supporting hole, and an upper end shell upper end cover sealing ring 2 is embedded between the outer surface of the lower part of the upper end shell upper end cover 1 and the upper part of the upper end shell 3; the inner surface of the upper part of the lower end shell 8 is fixedly connected with the outer surface of the lower part of the upper end shell 3 through threads, and the middle lower part is matched with the lower end bearing 11 through a support hole.

As shown in fig. 2, the oil port a is provided at the lower end of the diameter-variable part of the side wall of the upper housing 3 and at the same level as the upper surface of the upper swash plate 13, and the oil port 1, the oil port 2 and the oil port 3 are provided at the lower side and the middle of the chamfer of the diameter-variable part of the upper part of the side wall of the lower housing 8 and at the same level as the lower end of the cylinder 16 and at the lower end of the lower swash plate 10.

The cylinder body 16 is a cylinder, 9 cylinder holes for mounting 9 plungers 9 are uniformly distributed on the circumference of the cylinder body, the outer surface of the upper part of the cylinder body is matched with the inner surface of the movable sealing ring 6, and a movable sealing ring 7 is embedded between the inner surface of the movable sealing ring 6 and the outer surface of the upper part of the cylinder body 16.

As shown in fig. 3, 9 corresponding holes are formed in the upper side of the return plate 15 to press 9 sliding shoes 14 on the lower surface of the upper end swash plate 13, the lower sides of the 9 sliding shoes 14 are respectively connected with the upper ends of the 9 plungers 9 through spherical hinges, and the pressing plate 5 is connected with the outer end of the lower surface of the upper end swash plate 13 through threads and controls the degree of freedom of the return plate 15 with a constant gap. The pressure plate 5 is of an L-shaped structure, and the sliding shoe 14 is of a circular truncated cone structure.

The upper end of the plunger 9 is of a ball head structure, the lower end of the plunger is of a hemispherical structure and is not contacted with the upper surface of the lower end swash plate 10, the upper half part of the plunger is in transition fit with a cylinder hole 16 of the cylinder block, and the diameter of the lower half part of the plunger is slightly smaller than that of the upper half part of the plunger and is in clearance fit with the cylinder hole 16 of the cylinder block; the length of the upper half of the plunger 9 in the cylinder hole of the cylinder 16 is greater than the maximum length of the upper end surface of the extension cylinder 16, and the length of the lower half of the plunger in the cylinder hole of the cylinder 16 is greater than the maximum length of the lower end surface of the extension cylinder 16.

The upper surface of the upper end swash plate 13 is connected with the lower surface of the middle part of the upper end shell 3 through a pin, and the lower surface of the lower end swash plate 10 is connected with the upper surface of the middle part of the lower end shell 8 through a pin; the inclination angles of the upper end swash plate 13 and the lower end swash plate 10 are both 17 degrees, the upper end swash plate 13 limits the displacement of the plunger 9, the plunger 9 is enabled to do composite motion of rotation and reciprocation under the driving of the main shaft 12 and the cylinder body 16, and the composite motion enables the lower ends of the 9 plungers 9 to be always positioned on an inclined plane which is at an inclination angle of 17 degrees and is parallel to and not coincident with the upper inclined plane of the lower end swash plate 10, as shown in fig. 4. Through holes through which the main shaft 12 passes are reserved among the upper end cover 1 of the upper end shell, the upper end swash plate 13 and the lower end swash plate 10, and the through holes are in clearance fit with the main shaft 12.

The main shaft 12 is an eight-section stepped shaft structure, and the shaft diameter changes from top to bottom:

d₈<d₇＝d₄<d₆<d₁<d₂<d₅<d₃ (1)

wherein: d_iRepresents the i-th section axis, i is 1-8; the section i shaft is not equal to 6 and is an optical axis, the upper part of the section 6 shaft is provided with a spline, and the lower part of the section 6 shaft is the optical axis; the upper part of the 1 st section shaft is in clearance fit with the inner surface of the upper end cover 1 of the upper end shell, the 2 nd section shaft is in clearance fit with the inner surface of the middle part of the upper end shell 3, the 3 rd section shaft is in clearance fit with the inner surface of the upper end swash plate 13, the upper surface of the 5 th section shaft is provided with a threaded through hole and is fixedly connected with the upper surface of the cylinder body 16 through threads, and the 7 th section shaft is in clearance fit with the inner surface of the lower end swash plate 10; the upper end bearing 4 is installed to 1 st section axle lower extreme, and 6 th section axle is through spline connection and threaded connection fixed mounting has cylinder body 16, and lower extreme bearing 11 is installed to 8 th section axle upper end.

The internal components of the upper end shell 3 play a driving role, and the internal components of the lower end shell 8 are actual testing components for stirring loss. When the device is operated, the rotation of the cylinder 16 and the main shaft 12 drives the 9 plungers 9 and the skid shoes 14 connected with the plungers to rotate, and the plunger-skid shoe assembly performs a composite motion of rotation and reciprocation due to the limitation of the upper end swash plate 13, the pressure plate 5 and the rotary return plate 15. Because the plunger 9 and the cylinder body 16 are communicated with the upper end shell and the lower end shell, the motion rule of the plunger 9 and the cylinder body 16 in the lower end shell 8 can be ensured to be consistent with the motion rule in a real plunger pump. The close but non-contact between the lower end swash plate 10 and the plunger 9 reduces the actual flow field on the basis of eliminating the friction influence of the swash plate and the plunger. The lower end of the plunger 9 is in clearance fit with the cylinder body 16, so that the friction influence is eliminated. The part below the lower end swash plate 10 is full of oil liquid in the oil-free state around the dry-type stirring loss testing component and the oil-full state around the wet-type stirring loss testing component, so that the lubricating states of the non-stirring loss testing component in the dry-type state and the wet-type state are consistent, and further the friction influence can be stripped by making a torque difference. The cylinder body 16 and the main shaft 12 can be regarded as an integrated structure due to the consistent motion rule and the reliability of the connection mode, and the friction influence is eliminated.

The invention successfully eliminates the friction influence of each friction pair and realizes the accurate measurement of the stirring loss of the rotating component in the axial plunger pump or the motor.

The device adopts a vertical installation mode that the motor is arranged on the upper part and the device is arranged on the lower part.

When testing the total stirring loss caused by the oil stirring movement of the plunger 9 and the cylinder 16, oil is fed from the oil port 1 at the lower end in a wet state, when the liquid level reaches the position of the lower part of the oil port 1, the oil port 1 is closed, and the device is started to measure the torque value; the lower end oil port 3 is opened in a dry state, and when no oil flows out from the oil port 3, the device is started to measure a torque value; and finally, subtracting the torque values measured by the wet method and the dry method to obtain the total stirring loss.

When testing the stirring loss caused by the oil stirring movement of the plunger 9, feeding oil from the oil port 2 at the lower end in a wet state, when the liquid level reaches the position of the lower part of the oil port 2, closing the oil port 2, starting the device, and measuring the torque value; the lower end oil port 3 is opened in a dry state, and when no oil flows out from the oil port 3, the device is started to measure a torque value; and finally, subtracting the torque values measured in the wet and dry modes to obtain the stirring loss caused by the oil stirring movement of the plunger.

When the stirring loss caused by the oil stirring movement of the cylinder 16 is tested, the difference between the total stirring loss and the stirring loss caused by the oil stirring movement of the plunger 9 is obtained.

When the invention works, oil is injected from the oil port A, and the leakage is prevented between the upper end shell 3 and the cylinder body 16 by adopting a dynamic sealing structure, so that the inner part of the upper end shell 3, namely the driving part, can be always in a state of being filled with the oil, the lubricating and cooling conditions are good, the long-time work can be realized, and the long-time change rule of stirring loss can be obtained.

The stirring loss testing device for the rotating assembly in the axial plunger pump or the motor can realize accurate measurement of stirring loss of the rotating assembly in the axial plunger pump or the motor due to successful peeling friction influence; due to the arrangement of the oil port, the independent test of the stirring loss caused by the oil stirring motion of the plunger and the cylinder body in the axial plunger pump or the motor can be realized; benefiting from two shell structure for inside the upper end casing driving part can be in all the time and fill the oil liquid state, and the lubricated cooling state is good, can realize long-time work, acquires the long term law of change of stirring loss.

The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope defined by the claims of the present invention.