Hybrid magnetically-liquid supported levitated shoe vane axial piston pump

Abstract

The application relates to a liquid-magnetic composite supporting suspension type sliding shoe axial plunger pump, and relates to the technical field of fluid transmission and control, which comprises an outer shell, a cylinder, a flow distribution disc, a swash plate, a permanent magnet ring, a magnetic sliding shoe, a return plate, a plunger and a transmission shaft, the cylinder is arranged in the outer shell, the cylinder is supported on the flow distribution disc through a cylinder lining plate, the second end of the cylinder is provided with the return plate, the swash plate is arranged on an upper end cover, the swash plate is internally provided with the permanent magnet ring and an iron core with a coil, a plurality of magnetic sliding shoes are arranged on the swash plate, the plunger is slidably arranged in the cylinder lining of the cylinder, the first end of the plunger is connected with the magnetic sliding shoe ball hinge, the first end of the transmission shaft is supported on the upper end cover, and the second end of the transmission shaft is threadedly connected with the cylinder. The application generates magnetic force through the interaction of the permanent magnet ring, the coil, the iron core and the magnetic sliding shoe, and realizes the suspension of the sliding shoe on the surface of the swash plate together with the liquid pressure, thereby effectively reducing the abrasion of the sliding shoe and the swash plate and prolonging the service life of the swash plate axial plunger pump.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid transmission and control, and in particular to a liquid-magnetic composite support suspended 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 due to 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 is an important link among them and is an important component that bears the load. The most common failure form of the plunger pump is the motion failure caused by damage to the slipper pair, and with the increase of pressure, speed and working environment requirements, its impact on the structure is more prominent.

[0003] Currently, most research focuses on improving the efficiency and lifespan of swashplate axial piston pumps by rationally designing the materials, surface texture, and macrostructural dimensions of the slipper-swashplate assembly. However, these approaches are often limited by cost and processing difficulties. Furthermore, the use of magnetic force within the slipper assembly to adjust film thickness remains theoretical. To address friction and wear within the slipper assembly and extend the lifespan of swashplate axial piston pumps, a novel plunger pump design that incorporates magnetic force is urgently needed to optimize the slipper's motion, thereby improving lubrication, reducing friction and wear, and extending service life. Summary of the Invention

[0004] In response to the problems existing in the prior art, the present invention provides a liquid-magnetic composite supported suspended slipper pair axial piston pump, which generates magnetic force through the interaction between the permanent magnet ring, coil, iron core and magnetic slipper, and cooperates with liquid pressure to realize the 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 a liquid inlet valve and a liquid outlet valve, and the lower end cover is provided with the distribution plate, and the two sides of the distribution plate are respectively provided with a liquid inlet channel and a liquid outlet channel connected to the liquid inlet valve and the liquid outlet valve; the cylinder body is provided inside the outer shell, and the cylinder body is provided with a plurality of valves surrounding the A cylinder through hole on 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 a plurality of cylinder liner pipes corresponding to the cylinder liner are provided on the cylinder liner, the first end of the cylinder liner is connected to the first end of the cylinder liner through a sealing ring, a lower through hole is provided at the first end in the middle of the cylinder body, a compression spring is provided in the lower through hole, 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 hinge, 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 hinge; 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, causing the magnetic shoe to perform an elliptical motion on the end surface of the swash plate. At this time, the copper wire coil on the iron core is energized. 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 and generates 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 cause the magnetic shoe to 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, and 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 to 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 magnet ring connecting rib and the straight line where the dead point position of the magnetic sliding shoe is located during movement is 6°, and the permanent magnet 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 slot on the swash plate, and the first end face of the iron core is coplanar with the first end face of the swash 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, the second end of the coil passes through the upper stepped hole of the swash plate and the wiring groove below the swash plate and is 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 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 any 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 angle of the surface current element.

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

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

[0017] The features and advantages of the present application are:

[0018] 1. The liquid-magnetic composite supporting suspension type sliding shoe auxiliary axial piston pump provided by the present application generates the same magnetic pole as the magnetic sliding shoe through the setting of the coil and the iron core after electrification, and further generates the main magnetic force for regulating the liquid film thickness, overcomes the liquid film generated by the previous hydraulic supporting force, avoids the friction and wear between the magnetic sliding shoe and the swash plate, and prolongs the service life.

[0019] 2. The liquid-magnetic composite supporting suspension type sliding shoe auxiliary axial piston pump provided by the present application is provided with a permanent magnet with an inner ring and an outer ring, which can regulate the overturning of the magnetic sliding shoe in the radial direction and avoid the radial wear of the magnetic sliding shoe, and the permanent magnet increases a permanent magnetic force on the basis of the electromagnetic force, so that the radial wear of the sliding shoe is avoided and the energy consumption of the electromagnetic energy is reduced to a certain extent.

[0020] 3. The liquid-magnetic composite supporting suspension type sliding shoe auxiliary axial piston pump provided by the present application avoids the wear between the swash plate and the magnetic sliding shoe, saves the replacement of the workpieces damaged by wear in the past, reduces the maintenance and repair of the pump in the later period, and thus effectively reduces the later cost of the product.

[0021] 4. The liquid-magnetic composite supporting suspension type sliding shoe auxiliary axial piston pump provided by the present application can be used for the composite support of the magnetic force and the hydraulic supporting force, and when the space is increased, the magnetic force can be used for regulation and control alone, the volumetric efficiency of the swash plate axial piston pump is further improved, and the size of the electromagnetic force is changed through the electric control part outside the pump, so that the pump is more easily adapted to different load pressures. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is the overall structure schematic diagram of the liquid-magnetic composite supporting suspension type sliding shoe auxiliary axial piston pump of the present application;

[0023] Figure 2 is the structure schematic diagram of the distribution plate of the present application;

[0024] Figure 3 is the structure schematic diagram of the return plate of the present application;

[0025] Figure 4 is the structure schematic diagram of the swash plate of the present application;

[0026] Figure 5 is the structure schematic diagram of the permanent magnet ring of the present application;

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

[0028] MAIN REFERENCE NUMBERS:

[0029] Drive 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 plate 11; liquid inlet channel 111; liquid outlet channel 112; lower end cover 12; liquid inlet valve 13; swash 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 rack 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 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] To fully describe the technical content, structural features, objectives and effects of the present invention, the following is a detailed description with reference to the accompanying drawings.

[0031] The present invention is a liquid-magnetic composite support suspension type slipper pair axial piston pump, such as Figures 1 to 3As shown, it comprises an outer shell 6, a cylinder body 7, a distribution disc 11, a swash plate 14, a permanent magnet ring 16, a magnetic sliding shoe 17, a return disc 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 an inlet valve 13 and an outlet valve 24, and the lower end cover 12 is provided with a distribution disc 11, the two sides of the distribution disc 11 are respectively provided with an inlet channel 111 and an outlet channel 112 which are communicated with the inlet valve 13 and the outlet valve 24; the cylinder body 7 is arranged inside the outer shell 6, and a plurality of cylinder through holes around the central axis of the cylinder body 7 are arranged on the cylinder body 7, a cylinder liner 8 is arranged in each cylinder through hole, the cylinder body 7 is supported on the distribution disc 11 through a cylinder liner plate 10, and a plurality of cylinder liner pipes 9 corresponding to the cylinder liner 8 are arranged on the cylinder liner plate 10, the first end of the cylinder liner pipe 9 is connected with the first end of the cylinder liner 8 through a sealing ring 23, the first end of the cylinder body 7 at the middle part is provided with a lower through hole, a compression spring 20 is arranged in the lower through hole, the first end of the compression spring 20 is in contact with the first end face of the lower through hole of the cylinder body 7, the second end of the compression spring 20 is in contact with the first end face of the cylinder liner plate 10 through a compression spring seat 22, the second end of the cylinder body 7 is provided with a return disc pressure head 19, and the return disc pressure head 19 is ball-joint connected with the return disc 18, the swash plate 14 is arranged 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, a plurality of magnetic sliding shoes 17 are arranged on the swash plate 14, and the plurality of magnetic sliding shoes 17 are embedded on the return disc 18 and are pressed on the first end face of the swash plate 14, the plunger 21 is slidingly arranged in the cylinder liner 8, and the first end of the plunger 21 is ball-joint connected with the magnetic sliding shoe 17; 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 is threadedly connected with the cylinder body 7 through the upper end cover 2 and the swash plate 14, the transmission shaft 1 drives the cylinder body 7 to rotate, so that the magnetic sliding shoe 17 makes an elliptical motion on the end face of the swash plate 14, at this time, the copper coil 3 on the iron core 4 is electrified, under the action of the permanent magnet ring 16 and the iron core 4, the magnetic force is generated between the swash plate 14 and the magnetic sliding shoe 17, and at the same time, when the magnetic sliding shoe 17 makes an elliptical motion, the liquid in the cavity of the plunger 21 generates a hydraulic supporting force between the swash plate 14 and the magnetic sliding shoe 17 after passing through the damping hole at the first end of the plunger 21, at this time, the magnetic force and the hydraulic supporting force jointly act on the magnetic sliding shoe 17 to make the magnetic sliding shoe 17 suspended on the swash plate 14.

[0032] As 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 an iron core slot 143 is provided above each stepped hole 148, and a wiring slot 147 is provided below the stepped hole 148. An inner permanent magnet ring slot 149 is provided on the inner side of the first end face of the swash plate 14, and a positioning slot 144 is provided on the inner side of the inner permanent magnet ring slot 149. An outer permanent magnet ring slot 142 is provided on the outer side of the first end face of the swash plate 14, and a disassembly slot 141 is provided on the outer side of the outer permanent magnet ring slot 142, and the inner permanent magnet ring slot 149 is connected to the outer permanent magnet ring slot 142 by a connecting rib slot 145. A wiring rack slot 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, and the positioning column 164 is arranged in the positioning groove 144. The inner permanent magnet ring 161 is arranged in the inner permanent magnet ring groove 149, and 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 face 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 shoe 17 is located during movement is 6°, and the permanent magnetic ring connecting rib 163 can provide tangential force to the magnetic shoe 17 at the dead point position.

[0035] like Figure 6 As shown, connectors 5 are further 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 positioned within the iron core slot 143 on the swash plate 14 and secured in place by a stepped hole 148 within the swash plate 14. The first end face of the iron core 4 is coplanar with the first end face of the swash plate 14. The coil 3 is wound around the outside of the iron core 4, with the first end of the coil 3 wound around the iron core 4. The second end of the coil 3 passes through the stepped hole 148 and the wiring slot 147 below the swash plate 14, is received in the wiring rack 15, and is connected to the corresponding terminal on the connector 5. A cross-shaped hole is also provided at the bottom of the iron core 4. During installation, the wound iron core 4 can be inserted into the first end face of the swash plate 14 and then tightened with a Phillips screwdriver at the back of the swash plate 14. The position of the core 4 is controlled by the stepped hole 148 within 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] Where, is the Laplace differential operator; t is time, unit s; H is the magnetic field intensity, unit A / m; B is the magnetic induction intensity, unit T; E is the electric field intensity, unit N / C; D is the electric field intensity, unit C / m 2 ; J is the current density, unit is A / m 2 ; ρ is the charge density, unit is 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 B1(r) is:

[0044]

[0045] Where dl is the tiny magnetic dipole element on the permanent magnet 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 your right hand along the direction of the current, with the palm facing the center of the circular current. The direction pointed by your thumb is the direction of the magnetic field. The expression for 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 any 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 angle 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 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 Figures 1 to 6 As shown, the present invention is a liquid-magnetic composite support suspension type slipper pair axial piston pump,

[0054] When the external motor drives the drive shaft 1 to rotate, the drive shaft 1 drives the cylinder body 7, which in turn drives the plunger 21 and magnetic shoe 17. The compression spring 20 mounted on the cylinder body 7 remains compressed, with the first end of the compression spring 20 abutting against the cylinder body 7 and the second end against the compression spring seat 22. This forces the cylinder body 7 to apply pressure to the return plate ram 19, which is spherically connected to the return plate 18. Simultaneously, the return plate 18 contacts the magnetic shoe 17, allowing the plunger 21 to complete the liquid suction process in the low-pressure area. Due to the angle between the swash plate 14 and the cylinder body 7, the magnetic shoe 17 and plunger 21 perform elliptical motion along the surface of the swash plate 14 and linear reciprocating motion along the surface of the cylinder body 7, respectively. This results in a high-pressure area (0-180°) on the swash plate 14, representing the liquid discharge process, and a low-pressure area (180°-360°), representing the liquid suction process. As the magnetic shoe 17 elliptically moves along the surface of the swash plate 14, the fluid within the piston 21 cavity passes through the damping orifice at the first end of the piston 21, generating a hydraulic support force between the swash plate 14 and the magnetic shoe 17. Simultaneously, a current flows through the coil 3 within the swash plate 14, causing the magnetic poles of the iron core 4 on the side in contact with the magnetic shoe 17 to align with the magnetic shoe 17, thereby following the principle of repulsion. This is the primary magnetic force behind the magnetic support of the composite swash plate axial piston pump. Furthermore, the permanent magnet ring 16 embedded in the surface of the swash plate 14 assists in generating a certain magnetic force and helps the magnetic shoe 17 return to its equilibrium position when it tilts radially. The permanent magnet ring connecting ribs 163 of the permanent magnet ring 16 are offset by 6° from the line corresponding to the dead point of the magnetic shoe 17's movement, making it easier for the magnetic shoe 17 to pass through this dead point. The magnitude of the electromagnetic force is controlled by connecting the internal copper wires to the external electronic control system via connectors 5 mounted on the surface of the outer housing 6. Each pair of terminals is connected to a separate copper wire coil 3, independently of 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 swash 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 swash plate, reducing the probability of eccentric wear, and 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 magnitude of the electromagnetic force can be changed by the electronic 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 the slipper pair and other friction pairs.

[0056] The above embodiments are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the 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 fall within the scope of protection 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 provided on both sides of the distribution plate; The cylinder body is arranged inside the outer shell, and is provided with a plurality of cylinder through holes around the central axis of the cylinder body on the cylinder body, and a cylinder bushing is provided in each of the cylinder through holes, and the cylinder body is supported on the distribution plate through a cylinder liner, and a plurality of cylinder liner pipes corresponding to the cylinder bushings are provided on the cylinder liner, and the first end of the cylinder liner is connected to the first end of the cylinder liner through a sealing ring, and a lower through hole is provided at the first end in the middle of the cylinder body, and a compression spring is provided in the lower through hole, 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. The second end of the compression spring contacts the first end surface of the cylinder liner through a compression spring seat, the second end of the cylinder is provided with a return plate pressure head, and the return plate pressure head is connected to the return plate ball hinge, 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 the 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 hinge; 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, causing the magnetic shoe to perform an elliptical motion on the end surface of the swash plate. At this time, the copper wire coil on the iron core is energized. 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 and generates 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 cause the magnetic shoe to suspend on the swash plate. The permanent magnetic ring includes an inner permanent magnetic ring and an outer permanent magnetic ring, and the inner permanent magnetic ring and the outer permanent magnetic ring are connected by a permanent magnetic ring connecting rib; 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 tangential force to the magnetic sliding shoe at the dead point position.

2. The liquid-magnetic composite support suspension type slipper pair axial piston pump according to claim 1, characterized in that: 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, and a disassembly groove is provided on the outer side of the outer permanent magnet ring groove. The inner permanent magnet ring groove and the outer permanent magnet ring groove are connected by a connecting rib groove, and a wiring rack groove is provided 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, characterized in that: A positioning post is provided on the inner side of the inner permanent magnet ring, the permanent magnet ring is provided on the swash plate, the positioning post is provided in the positioning groove, and the inner permanent magnet ring is provided in the inner permanent magnet ring groove, the outer permanent magnet ring is provided 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 1, characterized in that: 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.

5. The liquid-magnetic composite support suspension type slipper pair axial piston pump according to claim 4, characterized in that: The iron core is arranged in the iron core slot on the swash plate, and the first end surface of the iron core is coplanar with the first end surface of the swash 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. The second end of the coil passes through the upper stepped hole of the swash plate and the wiring groove below the swash plate and is accommodated on the wiring rack, and is correspondingly connected to the terminal on the connector.

6. The liquid-magnetic composite support suspension type slipper pair axial piston pump according to claim 1, characterized in that: 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 N-level according to the right-hand rule.

7. The liquid-magnetic composite support suspended slipper pair axial piston pump according to claim 6, characterized in that: The expression of the magnetic field energy generated by a single coil is: ； ； ； Where, is the distance factor, ; is any point in space; is the center distance between two adjacent coils; is the number of turns of the coil; is the coil radius; is the vacuum permeability; is the current intensity; is the surface current element azimuth.

8. The liquid-magnetic composite support suspended slipper pair axial piston pump according to claim 6, characterized in that: The first end face of the permanent magnet ring is N-grade, the surface of the magnetic sliding shoe close to the first end face of the permanent magnet ring is the first end face, and the first end face of the magnetic sliding shoe is N-grade.

9. The liquid-magnetic composite support suspended slipper pair axial piston pump according to claim 1 or 4, 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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