Liquid-magnetic composite supporting suspension type piston shoe pair axial plunger pump

Abstract

The invention relates to the technical field of fluid transmission and control, in particular to a liquid-magnetic composite bearing suspension type sliding shoe pair axial plunger pump which comprises an outer shell, a cylinder body, a valve plate, a swash plate, a permanent magnet ring, a magnetic sliding shoe, a return plate, a plunger and a transmission shaft. A return plate is arranged at the second end of the cylinder body, the swash plate is arranged on the upper end cover, a permanent magnet ring and an iron core with a coil are arranged in the swash plate, a plurality of magnetic sliding shoes are arranged on the swash plate, the plunger is arranged in a cylinder body lining of the cylinder body in a sliding mode, the first end of the plunger is connected with the magnetic sliding shoes in a spherical hinge mode, and the first end of the transmission shaft is supported on the upper end cover. The second end of the transmission shaft is in threaded connection with the cylinder body. Magnetic force is generated through interaction of the permanent magnet ring, the coil, the iron core and the magnetic sliding shoe, suspension of the sliding shoe on the surface of the swash plate is jointly achieved in cooperation with liquid pressure, then abrasion of the sliding shoe and the swash plate is effectively reduced, and the service life of the swash plate axial plunger pump is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of fluid transmission and control, and in particular to a liquid-magnetic composite support suspension type slipper pair axial piston pump. Background Art

[0002] The swash plate axial piston pump is widely used in aerospace equipment, ships, agricultural machinery and other fields because of its high pressure, fast speed, small size and high power density. Its mechanical efficiency, volumetric efficiency, reliability and fatigue life are all affected by three important friction pairs, namely the slipper pair composed of the slipper and the swash plate, the plunger pair composed of the plunger and the cylinder body, and the distribution pair composed of the cylinder body and the distribution plate. The slipper pair, as an important link, is an important component that bears the load. The motion failure caused by damage to the slipper pair is the most common failure form in the plunger pump, and with the increase of pressure, speed and working environment requirements, its impact on the structure is more prominent.

[0003] Most of the current research focuses on the reasonable design of the materials, surface texture, and macroscopic structural dimensions of the slipper-swash plate to improve the efficiency and life of the swash plate axial piston pump. Most of these methods are limited by cost and processing difficulties, and the method of introducing magnetic force into the slipper pair to adjust the film thickness is still theoretical. In order to solve the friction and wear problems of the slipper pair and extend the life of the swash plate axial piston pump, it is urgent to build a new type of plunger pump that can introduce magnetic force, optimize the movement posture of the slipper, and further improve the lubrication state of the slipper pair, reduce friction and wear, and extend the service life. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a liquid-magnetic composite support suspended slipper pair axial piston pump, which generates magnetic force through the interaction between permanent magnet rings, coils, iron cores and magnetic slippers, and cooperates with liquid pressure to achieve suspension of the slipper on the surface of the swash plate, thereby effectively reducing wear and further extending the service life of the swash plate axial piston pump.

[0005] The technical solution adopted by the present invention is a liquid-magnetic composite support suspended slipper pair axial piston pump, which includes an outer shell, a cylinder body, a distribution plate, a swash plate, a permanent magnet ring, a magnetic slipper, a return plate, a plunger and a transmission shaft. The first end of the outer shell is provided with an upper end cover, and the second end of the outer shell is provided with a lower end cover, the lower end cover is provided with an inlet valve and a liquid outlet valve, and the distribution plate is provided on the lower end cover, and the two sides of the distribution plate are respectively provided with a liquid inlet channel and a liquid outlet channel connected to the inlet valve and the liquid outlet valve; the cylinder body is arranged inside the outer shell, and the cylinder body is provided with a plurality of A cylinder through hole on the central axis of the cylinder body, each of which is provided with a cylinder liner, the cylinder body is supported on the distribution plate through a cylinder liner, and the cylinder liner is provided with a plurality of cylinder liner pipes corresponding to the cylinder liner, the first end of the cylinder liner pipe is connected to the first end of the cylinder liner through a sealing ring, the first end in the middle of the cylinder body is provided with a lower through hole, the lower through hole is provided with a compression spring, and the first end of the compression spring is in contact with the first end surface of the lower through hole in the cylinder body, and the second end of the compression spring is connected to the first end surface of the cylinder liner through a compression spring seat. The end faces are in contact, the second end of the cylinder body is provided with a return plate pressure head, and the return plate pressure head is connected to the return plate ball joint, the swash plate is provided on the upper end cover, and the permanent magnet ring and the iron core with the coil are provided in the swash plate, a plurality of magnetic shoes are provided on the swash plate, and a plurality of magnetic shoes are embedded in the return plate and pressed against the first end face of the swash plate, the plunger is slidably provided in the cylinder body bushing, and the first end of the plunger is connected to the magnetic shoe ball joint; the first end of the transmission shaft is supported on the upper end cover, and the second end of the transmission shaft passes through The upper end cover and the swash plate are threadedly connected to the cylinder body, and the transmission shaft drives the cylinder body to rotate, so that the magnetic shoe performs an elliptical motion on the end surface of the swash plate. At this time, the copper wire coil on the iron core is energized, and under the action of the permanent magnet ring and the iron core, a magnetic force is generated between the swash plate and the magnetic shoe. At the same time, when the magnetic shoe performs an elliptical motion, the liquid in the plunger cavity passes through the damping hole at the first end of the plunger to generate a hydraulic support force between the swash plate and the magnetic shoe. At this time, the magnetic force and the hydraulic support force work together to make the magnetic shoe suspend on the swash plate.

[0006] Furthermore, the first end face of the swash plate is an inclined face, and a plurality of stepped holes are provided on the first end face of the swash plate, and an iron core groove is provided above each of the stepped holes, and a wiring groove is provided correspondingly below the stepped holes, an inner permanent magnet ring groove is provided on the inner side of the first end face of the swash plate, and a positioning groove is provided on the inner side of the inner permanent magnet ring groove, an outer permanent magnet ring groove is provided on the outer side of the first end face of the swash plate, a disassembly groove is provided on the outer side of the outer permanent magnet ring groove, and the inner permanent magnet ring groove is connected with the outer permanent magnet ring groove through a connecting rib groove, and a wiring rack groove is provided on the outer arc surface of the swash plate.

[0007] Preferably, the permanent magnet ring includes an inner permanent magnet ring and an outer permanent magnet ring, and the inner permanent magnet ring and the outer permanent magnet ring are connected by a permanent magnet ring connecting rib, a positioning column is provided on the inner side of the inner permanent magnet ring, the permanent magnet ring is arranged on the swash plate, the positioning column is arranged in the positioning groove, and the inner permanent magnet ring is arranged in the inner permanent magnet ring groove, the outer permanent magnet ring is arranged in the outer permanent magnet ring groove, and the first end faces of the permanent magnet rings are coplanar with the first end face of the swash plate.

[0008] Furthermore, the angle between the permanent magnetic ring connecting rib and the straight line where the dead point position of the magnetic sliding shoe is located during the movement is 6°, and the permanent magnetic ring connecting rib can provide a tangential force to the magnetic sliding shoe at the dead point position.

[0009] Preferably, connectors are further provided on both sides of the first end of the outer shell, and a wiring rack is provided on the wiring rack groove on the outer arc surface of the inclined plate.

[0010] Preferably, the iron core is arranged in the iron core groove on the inclined plate, and the first end face of the iron core is coplanar with the first end face of the inclined plate, a coil is wound around the outside of the iron core, and the first end of the coil is wound around the iron core, and the second end of the coil passes through the upper step hole of the inclined plate and the wiring groove under the inclined plate to be accommodated on the wiring rack, and is correspondingly connected to the terminal on the connector.

[0011] Preferably, the direction of the magnetic field generated by the iron core and the coil is such that the first end face of the iron core is of N-level according to the right-hand rule.

[0012] Preferably, the expression of the magnetic field generated by the single coil is:

[0013]

[0014] Where Kn is the distance factor, K n ={[(x-r0cosθ) 2 +(y-r0sinθ) 2 +[z-(n-1)a] 2 ]} 3 / 2 ; (x, y, z) is an arbitrary point in space; a is the center distance between two adjacent coils; n is the number of turns of the coil; r0 is the radius of the coil; μ0 is the magnetic permeability of vacuum; I is the current intensity; θ is the azimuth of the surface current element.

[0015] Preferably, the first end face of the permanent magnetic ring is of N level, the surface of the magnetic sliding shoe close to the first end face of the permanent magnetic ring is the first end face, and the first end face of the magnetic sliding shoe is of N level.

[0016] Preferably, the connector, the swash plate and the inner surface of the outer shell are all coated with an insulating layer.

[0017] The characteristics and beneficial effects of the present invention are:

[0018] 1. The liquid-magnetic composite support suspended slipper auxiliary axial piston pump provided by the present invention, by setting a coil and an iron core, generates the same magnetic pole as the magnetic slipper after power is turned on, and then generates the main magnetic force for regulating the thickness of the liquid film, overcoming the previous liquid film generated only by hydraulic support force, and avoiding the friction and wear between the magnetic slipper and the inclined plate, thereby extending the service life.

[0019] 2. The liquid-magnetic composite supported suspended slipper pair axial piston pump provided by the present invention is provided with a permanent magnet with an inner ring and an outer ring, which can radially regulate the overturning of the magnetic slipper to avoid its radial wear. At the same time, this permanent magnet adds a permanent magnetic force on the basis of the electromagnetic force, so it can not only avoid the radial wear of the slipper but also reduce the energy consumption of electromagnetic energy to a certain extent.

[0020] 3. The liquid-magnetic composite support suspended slipper pair axial piston pump provided by the present invention avoids the wear of the swash plate and the magnetic slipper, thus saving the replacement of workpieces damaged by wear in the past, thereby reducing the subsequent repair and maintenance of the pump, thereby effectively reducing the subsequent cost of the product.

[0021] 4. The liquid-magnetic composite support suspended slipper pair axial piston pump provided by the present invention can be used for the composite support of magnetic and hydraulic support forces. At the same time, when the space is increased, magnetic force control can be used alone to further improve the volumetric efficiency of the inclined plate axial piston pump. At the same time, the size of the electromagnetic force can be changed through the electronic control part outside the pump, thereby making it easier to adapt to different load pressures. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the liquid-magnetic composite support suspension type sliding shoe pair axial piston pump of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the distribution plate of the present invention;

[0024] Figure 3 It is a schematic diagram of the structure of the return plate of the present invention;

[0025] Figure 4 It is a structural schematic diagram of the swash plate of the present invention;

[0026] Figure 5 It is a structural schematic diagram of the permanent magnetic ring of the present invention;

[0027] Figure 6 It is a schematic diagram of the magnetic sliding shoe of the present invention on the swash plate.

[0028] Main reference numerals:

[0029] Transmission shaft 1; upper end cover 2; coil 3; iron core 4; connector 5; outer shell 6; cylinder body 7; cylinder bushing 8; cylinder liner 9; cylinder liner 10; distributor 11; liquid inlet channel 111; liquid outlet channel 112; lower end cover 12; liquid inlet valve 13; inclined plate 14; disassembly groove 141; outer permanent magnet ring groove 142; iron core groove 143; positioning groove 144; connecting rib groove 145; wiring rack groove 146; wiring groove 147; stepped hole 148; inner permanent magnet ring groove 149; wiring rack 15; permanent magnet ring 16; inner permanent magnet ring 161; outer permanent magnet ring 162; permanent magnet ring connecting rib plate 163; positioning column 164; magnetic shoe 17; return plate 18; return plate pressure head 19; compression spring 20; plunger 21; compression spring seat 22; sealing ring 23; liquid outlet valve 24; DETAILED DESCRIPTION

[0030] In order to fully describe the technical content, structural features, objectives and effects of the present invention, the following will be described in detail with reference to the accompanying drawings.

[0031] The present invention provides a liquid-magnetic composite support suspension type sliding shoe auxiliary axial piston pump, such as Figure 1 to Figure 3As shown, it includes an outer shell 6, a cylinder body 7, a distribution plate 11, a swash plate 14, a permanent magnet ring 16, a magnetic shoe 17, a return plate 18, a plunger 21 and a transmission shaft 1, the first end of the outer shell 6 is provided with an upper end cover 2, and the second end of the outer shell 6 is provided with a lower end cover 12, the lower end cover 12 is provided with a liquid inlet valve 13 and a liquid outlet valve 24, and the lower end cover 12 is provided with a distribution plate 11, and the two sides of the distribution plate 11 are respectively provided with a liquid inlet channel 111 and a liquid outlet channel 112 connected to the liquid inlet valve 13 and the liquid outlet valve 24; the cylinder body 7 is arranged inside the outer shell 6, and the cylinder body 7 is provided with a plurality of The cylinder through hole of the central axis is provided with a cylinder bushing 8 in each cylinder through hole. The cylinder 7 is supported on the distribution plate 11 through the cylinder liner 10, and the cylinder liner 10 is provided with a plurality of cylinder liner pipes 9 corresponding to the cylinder liner 8. The first end of the cylinder liner pipe 9 is connected to the first end of the cylinder liner 8 through a sealing ring 23. The first end of the middle of the cylinder 7 is provided with a lower through hole, and a compression spring 20 is provided in the lower through hole. The first end of the compression spring 20 contacts the first end surface of the lower through hole in the cylinder 7, and the second end of the compression spring 20 contacts the first end surface of the cylinder liner 10 through a compression spring seat 22. The cylinder body 7 is in contact with each other, the second end of the cylinder body 7 is provided with a return plate pressure head 19, and the return plate pressure head 19 is connected to the return plate 18 by a ball joint, the swash plate 14 is provided on the upper end cover 2, and the swash plate 14 is provided with a permanent magnet ring 16 and an iron core 4 with a coil 3, the swash plate 14 is provided with a plurality of magnetic shoes 17, and the plurality of magnetic shoes 17 are embedded in the return plate 18 and pressed against the first end surface of the swash plate 14, the plunger 21 is slidably provided in the cylinder body bushing 8, and the first end of the plunger 21 is connected to the magnetic shoe 17 by a ball joint; the first end of the transmission shaft 1 is supported on the upper end cover 2, and the second end of the transmission shaft 1 passes through the upper end cover 2 and the swash plate 14 are threadedly connected with the cylinder body 7, the transmission shaft 1 drives the cylinder body 7 to rotate, so that the magnetic slide shoe 17 makes an elliptical motion on the end surface of the swash plate 14, at this time, the copper wire coil 3 on the iron core 4 is energized, and under the action of the permanent magnet ring 16 and the iron core 4, a magnetic force is generated between the swash plate 14 and the magnetic slide shoe 17, and at the same time, when the magnetic slide shoe 17 makes an elliptical motion, the liquid in the cavity of the plunger 21 passes through the damping hole at the first end of the plunger 21, and then generates a hydraulic support force between the swash plate 14 and the magnetic slide shoe 17, and at this time, the magnetic force and the hydraulic support force work together to make the magnetic slide shoe 17 suspend above the swash plate 14.

[0032] like Figure 4As shown, the first end face of the swash plate 14 is an inclined face, and a plurality of stepped holes 148 are provided on the first end face of the swash plate 14, and a core groove 143 is provided above each stepped hole 148, and a wiring groove 147 is provided correspondingly below the stepped hole 148, an inner permanent magnet ring groove 149 is provided on the inner side of the first end face of the swash plate 14, and a positioning groove 144 is provided on the inner side of the inner permanent magnet ring groove 149, an outer permanent magnet ring groove 142 is provided on the outer side of the first end face of the swash plate 14, a disassembly groove 141 is provided on the outer side of the outer permanent magnet ring groove 142, and the inner permanent magnet ring groove 149 is connected to the outer permanent magnet ring groove 142 through a connecting rib groove 145, and a wiring rack groove 146 is provided on the outer arc surface of the swash plate 14.

[0033] like Figure 5 As shown, the permanent magnet ring 16 includes an inner permanent magnet ring 161 and an outer permanent magnet ring 162, and the inner permanent magnet ring 161 and the outer permanent magnet ring 162 are connected by a permanent magnet ring connecting rib 163, a positioning column 164 is provided on the inner side of the inner permanent magnet ring 161, the permanent magnet ring 16 is arranged on the swash plate 14, the positioning column 164 is arranged in the positioning groove 144, and the inner permanent magnet ring 161 is arranged in the inner permanent magnet ring groove 149, the outer permanent magnet ring 162 is arranged in the outer permanent magnet ring groove 142, and the first end faces of the permanent magnet ring 16 are coplanar with the first end faces of the swash plate 14.

[0034] In a preferred embodiment, the angle between the permanent magnetic ring connecting rib 163 and the straight line where the dead point position of the magnetic sliding shoe 17 is located during movement is 6°, and the permanent magnetic ring connecting rib 163 can provide a tangential force to the magnetic sliding shoe 17 at the dead point position.

[0035] like Figure 6 As shown, connectors 5 are also provided on both sides of the first end of the outer shell 6, and a wiring rack 15 is provided on the wiring rack groove 146 of the outer arc surface of the inclined plate 14. The wiring rack 15 is made of elastic material, and the two sections are connected by screws and nested in the outer arc surface of the inclined plate 14.

[0036] like Figure 6 As shown, the iron core 4 is arranged in the iron core slot 143 on the swash plate 14, and is limited by the stepped hole 148 in the swash plate 14, and the first end face of the iron core 4 is coplanar with the first end face of the swash plate 14, the outer side of the iron core 4 is wound with the coil 3, and the first end of the coil 3 is wound on the iron core 4, and the second end of the coil 3 passes through the stepped hole 148 and the wiring groove 147 under the swash plate 14 and is accommodated on the wiring rack 15, and is correspondingly connected to the terminal on the connector 5. At the same time, a cross hole is provided at the bottom of the iron core 4, and the wound iron core 4 can be inserted into the first end face of the swash plate 14 during installation, and then tightened at the back of the swash plate 14 with a cross-shaped screwdriver, and its position is limited by the stepped hole 148 inside the swash plate 14.

[0037] Specifically, the direction of the magnetic field generated by the iron core 4 and the coil 3 is N-level according to the right-hand rule.

[0038] Specifically, the first end face of the permanent magnet ring 16 is N-grade, the surface of the magnetic shoe 17 close to the first end face of the permanent magnet ring 16 is the first end face, and the first end face of the magnetic shoe 17 is N-grade.

[0039] Specifically, the connector 5 , the swash plate 14 and the inner surface of the outer shell 6 are all coated with an insulating layer.

[0040] Specifically, the liquid-magnetic composite support suspended slipper pair axial piston pump follows Maxwell's equations, which are expressed as follows:

[0041]

[0042] In the formula, is the Laplace differential operator; t is time, unit s; H is magnetic field intensity, unit A / m; B is magnetic induction intensity, unit T; E is electric field intensity, unit N / C; D is electric field intensity, unit C / m 2 ; J is the current density, unit A / m 2 ; ρ is the charge density, unit C / m 2 .

[0043] The magnetic field generated by the permanent magnet ring 16 at any point in space is given by the Biot-Savart law, and the expression of B1(r) is:

[0044]

[0045] Where dl is the tiny magnetic dipole element on the permanent magnetic ring; r is the vector from the element to the observation point; μ0 is the magnetic permeability of vacuum; and I is the current intensity.

[0046] The direction of the magnetic field generated by coil 3 can be determined by bending the four fingers of the right hand along the direction of the current, with the palm facing the center of the circular current. The direction pointed by the thumb is the direction of the magnetic field. The expression of the magnetic field energy generated by a single coil 3 is:

[0047]

[0048] Where Kn is the distance factor, K n ={[(x-r0cosθ) 2 +(y-r0sinθ) 2 +[z-(n-1)a] 2 ]} 3 / 2 ; (x, y, z) is an arbitrary point in space; a is the center distance between two adjacent coils; n is the number of turns of the coil; r0 is the radius of the coil; θ is the azimuth of the surface current element.

[0049] The magnetic field generated by a single core 4 can be regarded as a surface current density (μ f-μ0)nl generated magnetic field. And the magnetic force F on a single magnetic shoe 17 c The size can be calculated by the following formula:

[0050]

[0051] Wherein, m represents the magnetic moment of the magnet; B' is the magnetic induction intensity at the position where the magnetic sliding shoe 17 is located; is the gradient operator, which represents the derivative with respect to position.

[0052] The specific operation steps of the present invention are as follows:

[0053] like Figure 1 to Figure 6 As shown, a liquid-magnetic composite support suspension type sliding shoe pair axial piston pump of the present invention,

[0054] When the external motor drives the transmission shaft 1 to rotate, the transmission shaft 1 drives the cylinder body 7 to rotate, and the cylinder body 7 drives the plunger 21 and the magnetic shoe 17 to rotate. The compression spring 20 installed on the cylinder body 7 is always in a compressed state. The first end of the compression spring 20 is in contact with the cylinder body 7, and the second end of the compression spring 20 is in contact with the compression spring seat 22, so that the cylinder body 7 provides a pressure to the return plate pressure head 19, and the return plate pressure head 19 is connected with the return plate 18 by a ball joint. At the same time, the return plate 18 is in contact with the magnetic shoe 17, so that the plunger 21 completes the liquid absorption process in the low pressure area. Since there is an angle between the swash plate 14 and the cylinder body 7, the magnetic shoe 17 and the plunger 21 respectively perform an elliptical motion along the surface of the swash plate 14 and a linear reciprocating motion along the cylinder body 7 when the cylinder body 7 rotates, so that there will be a high pressure area of ​​0 to 180 degrees on the surface of the swash plate 14, that is, the liquid discharge process, and a low pressure area of ​​180 degrees to 360 degrees, that is, the liquid absorption process. When the magnetic shoe 17 makes an elliptical motion along the surface of the swash plate 14, the liquid in the cavity of the plunger 21 generates a hydraulic support force between the swash plate 14 and the magnetic shoe 17 through the damping hole on the first end of the plunger 21. At the same time, a current is passed through the coil 3 inside the swash plate 14 to make the magnetic pole of the iron core 4 on the side in contact with the magnetic shoe 17 the same as that of the magnetic shoe 17, thereby following the law of same-level repulsion. This is the main magnetic force of the magnetic support of the composite support swash plate axial piston pump. On the other hand, the permanent magnet ring 16 embedded in the surface of the swash plate 14 can be used to assist in generating a certain magnetic force and help the magnetic shoe 17 return to a balanced position when it tilts in the radial direction. The permanent magnet ring connecting rib 163 of the permanent magnet ring 16 is offset by 6° from the straight line where the dead point position of the magnetic shoe 17 is located during the movement, which makes it easier for the magnetic shoe 17 to pass through the dead point. The magnitude of the electromagnetic force needs to be controlled by connecting the internal copper wire with the external electronic control system through the connector 5 installed on the surface of the outer shell 6. Each pair of terminals is connected to a copper wire coil 3 respectively without affecting each other.

[0055] The present invention generates magnetic force by embedding a permanent magnet ring, a coil and an iron core in the surface of the inclined plate, and making them have the same magnetic pole as the contact surface of the magnetic slipper. The permanent magnet ring is responsible for adjusting the posture of the magnetic slipper when the magnetic slipper radially overturns on the surface, so that it is balanced with the surface of the inclined plate and the probability of eccentric wear is reduced. The permanent magnet ring connecting ribs of the permanent magnet ring helps the magnetic slipper pass the dead point. The coil and the iron core are responsible for generating the main magnetic force for the magnetic slipper to cooperate with the liquid pressure to more effectively support the slipper, and the size of the electromagnetic force can be changed by the electric control part outside the pump, so that it is easier to adapt to different load pressures. In addition, the present invention broadens the technical field for improving the lubrication and wear performance of slipper pairs and other friction pairs.

[0056] The above embodiments are only descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A liquid-magnetic composite support suspended slipper pair axial piston pump, characterized in that: It includes an outer shell, a cylinder body, a valve plate, a swash plate, a permanent magnet ring, a magnetic slipper, a return plate, a plunger and a transmission shaft. An upper end cover is provided at the first end of the outer shell, and a lower end cover is provided at the second end of the outer shell, a liquid inlet valve and a liquid outlet valve are provided on the lower end cover, and the distribution plate is provided on the lower end cover, and a liquid inlet channel and a liquid outlet channel connected to the liquid inlet valve and the liquid outlet valve are respectively provided on both sides of the distribution plate; The cylinder body is arranged inside the outer shell, and the cylinder body is provided with a plurality of cylinder through holes around the central axis of the cylinder body, each of the cylinder through holes is provided with a cylinder liner, the cylinder body is supported on the distribution plate through a cylinder liner, and the cylinder liner is provided with a plurality of cylinder liner pipes corresponding to the cylinder liner, the first end of the cylinder liner pipe is connected to the first end of the cylinder liner through a sealing ring, the first end in the middle of the cylinder body is provided with a lower through hole, the lower through hole is provided with a compression spring, and the first end of the compression spring is connected to the first end surface of the lower through hole in the cylinder body The second end of the compression spring contacts the first end surface of the cylinder liner through a compression spring seat, a return plate pressure head is provided at the second end of the cylinder, and the return plate pressure head is connected to the return plate ball joint, the swash plate is provided on the upper end cover, and the permanent magnet ring and the iron core with a coil are provided in the swash plate, a plurality of magnetic shoes are provided on the swash plate, and a plurality of magnetic shoes are embedded in the return plate and pressed against the first end surface of the swash plate, the plunger is slidably provided in the cylinder liner, and the first end of the plunger is connected to the magnetic shoe ball joint; The first end of the transmission shaft is supported on the upper end cover, and the second end of the transmission shaft passes through the upper end cover and the swash plate and is threadedly connected to the cylinder body. The transmission shaft drives the cylinder body to rotate, so that the magnetic shoe makes an elliptical motion on the end surface of the swash plate. At this time, the copper wire coil on the iron core is energized, and under the action of the permanent magnet ring and the iron core, a magnetic force is generated between the swash plate and the magnetic shoe. At the same time, when the magnetic shoe makes an elliptical motion, the liquid in the plunger cavity passes through the damping hole at the first end of the plunger to generate a hydraulic support force between the swash plate and the magnetic shoe. At this time, the magnetic force and the hydraulic support force work together to make the magnetic shoe suspend on the swash plate.

2. The liquid-magnetic composite support suspension type slipper pair axial piston pump according to claim 1 is characterized in that: The first end face of the swash plate is an inclined face, and a plurality of stepped holes are arranged on the first end face of the swash plate, and an iron core groove is arranged above each of the stepped holes, and a wiring groove is arranged correspondingly below the stepped holes, an inner permanent magnet ring groove is arranged on the inner side of the first end face of the swash plate, and a positioning groove is arranged on the inner side of the inner permanent magnet ring groove, an outer permanent magnet ring groove is arranged on the outer side of the first end face of the swash plate, a disassembly groove is arranged on the outer side of the outer permanent magnet ring groove, and the inner permanent magnet ring groove is connected with the outer permanent magnet ring groove through a connecting rib groove, and a wiring rack groove is arranged on the outer arc surface of the swash plate.

3. The liquid-magnetic composite support suspension type slipper pair axial piston pump according to claim 2 is characterized in that: The permanent magnet ring includes an inner permanent magnet ring and an outer permanent magnet ring, and the inner permanent magnet ring and the outer permanent magnet ring are connected by a permanent magnet ring connecting rib, a positioning column is provided on the inner side of the inner permanent magnet ring, the permanent magnet ring is arranged on the swash plate, the positioning column is arranged in the positioning groove, and the inner permanent magnet ring is arranged in the inner permanent magnet ring groove, the outer permanent magnet ring is arranged in the outer permanent magnet ring groove, and the first end faces of the permanent magnet rings are coplanar with the first end face of the swash plate.

4. The liquid-magnetic composite support suspension type slipper pair axial piston pump according to claim 3 is characterized in that: The angle between the permanent magnetic ring connecting rib and the straight line where the dead point position of the magnetic sliding shoe is located during the movement is 6°, and the permanent magnetic ring connecting rib can provide a tangential force to the magnetic sliding shoe at the dead point position.

5. The liquid-magnetic composite support suspension type slipper pair axial piston pump according to claim 1 is characterized in that: Connectors are also provided on both sides of the first end of the outer shell, and a wiring rack is provided on the wiring rack groove on the outer arc surface of the inclined plate.

6. The liquid-magnetic composite support suspension type slipper pair axial piston pump according to claim 5 is characterized in that: The iron core is arranged in the iron core groove on the inclined plate, and the first end surface of the iron core is coplanar with the first end surface of the inclined plate, a coil is wound around the outside of the iron core, and the first end of the coil is wound around the iron core, and the second end of the coil passes through the upper step hole of the inclined plate and the wiring groove under the inclined plate to be accommodated on the wiring rack, and is correspondingly connected to the terminal on the connector.

7. The liquid-magnetic composite support suspension type slipper pair axial piston pump according to claim 1 is characterized in that: The direction of the magnetic field generated by the iron core and the coil is N-level according to the right-hand rule.

8. The liquid-magnetic composite support suspension type sliding shoe pair axial piston pump according to claim 7 is characterized in that: The expression of the magnetic field energy generated by a single coil is: In the formula, K n is the distance factor, K n ={[(x-r0 cosθ) 2 +(y-r0 sinθ) 2 +[z-(n-1)a] 2 ]} 3 / 2 ; (x, y, z) is an arbitrary point in space; a is the center distance between two adjacent coils; n is the number of turns of the coil; r0 is the radius of the coil; μ0 is the magnetic permeability of vacuum; I is the current intensity; θ is the azimuth of the surface current element.

9. The liquid-magnetic composite support suspension type sliding shoe pair axial piston pump according to claim 7, characterized in that: The first end face of the permanent magnetic ring is of N level, the surface of the magnetic sliding shoe close to the first end face of the permanent magnetic ring is the first end face, and the first end face of the magnetic sliding shoe is of N level.

10. The liquid-magnetic composite support suspension type slipper pair axial piston pump according to claim 1 or 5, characterized in that: The connector, the swash plate and the inner surface of the outer shell are all coated with an insulating layer.

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