CN113738640B - Controllable electromagnetic composite supporting axial plunger pump swash plate-piston shoe assembly - Google Patents
Controllable electromagnetic composite supporting axial plunger pump swash plate-piston shoe assembly Download PDFInfo
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- CN113738640B CN113738640B CN202111024812.6A CN202111024812A CN113738640B CN 113738640 B CN113738640 B CN 113738640B CN 202111024812 A CN202111024812 A CN 202111024812A CN 113738640 B CN113738640 B CN 113738640B
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- annular
- swash plate
- sliding shoe
- electromagnet
- controllable electromagnetic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/18—Lubricating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
- F04B1/2014—Details or component parts
- F04B1/2078—Swash plates
Abstract
A magnetic force controllable electromagnetic ring is used for adjusting the thickness of a gap oil film of a sliding shoe friction pair, a plurality of annular deep grooves are processed on the surface of a swash plate, a small cylindrical electromagnet and an annular electromagnet of a winding coil are embedded into the electromagnetic ring, an annular permanent magnet is also processed on the bottom surface of the sliding shoe, the magnetism of the surface of the swash plate is the same as that of the bottom surface of the sliding shoe, a repulsive force of interaction is generated, and the thickness of the gap oil film of the sliding shoe friction pair is adjusted by changing the current in the annular electromagnet coil in the swash plate. The oil film thickness at the sliding shoe friction pair in the swash plate high-pressure oil action area is small, abrasion is easy to occur, the lubricating property of the oil film can be improved to a certain extent by increasing the magnetic repulsion force, the supporting force of the oil film on the surface of the sliding shoe friction pair is increased, the friction between the sliding shoe and the swash plate is reduced, and the dynamic stability performance of the swash plate-sliding shoe assembly is improved.
Description
Technical Field
The invention relates to the field of axial plunger pumps, in particular to a controllable electromagnetic composite supporting axial plunger pump swash plate-piston shoe assembly.
Background
The axial plunger pump is widely applied to hydraulic systems in different fields such as engineering machinery, construction machinery, aerospace equipment and the like due to the advantages of compact structure, large power-weight ratio, various variable modes and the like. Axial piston pumps are volumetric fluid machines that use volume changes to build pressure and deliver flow, and during operation there are a number of friction pairs, of which shoe friction pairs play an essential role. The sliding shoe friction pair is a plane pair consisting of a sliding shoe and a swash plate, and is a key friction pair participating in the oil pumping and discharging process of the axial plunger pump. In the process of oil suction and discharge, the sliding shoes are always tightly attached to the surface of the swash plate under the combined action of the pressure of the plunger cavity and the return disc, and whether the oil film performance of the friction pair of the sliding shoes is good or not influences the high-pressure and high-speed of the axial plunger pump as a direct bearer of the pressure of the plunger cavity.
The clearance oil film of the sliding shoe friction pair has the functions of lubrication, sealing, bearing support and the like. But the sliding shoe friction pair is also an energy dissipation source, on one hand, when a gap oil film of the sliding shoe friction pair is too large, the leakage loss is relatively large, and under the normal condition, the leakage loss is increased along with the increase of the working pressure and the speed of the plunger pump; on the other hand, when the oil film bearing capacity is not enough to resist the external load force, the sliding shoe friction pair is in extreme working conditions such as boundary lubrication and even dry friction, and the friction torque loss is obviously increased; the energy consumption generated by the two is converted into heat, the viscosity of oil is reduced, and the bearing capacity of an oil film is weakened until faults such as bearing interface abrasion, sliding shoe friction pair occlusion and the like occur, so that the mechanical efficiency and the volumetric efficiency of the whole pump are seriously influenced, and even the axial plunger pump fails.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a controllable electromagnetic composite supported axial plunger pump swash plate-slipper assembly, wherein an electromagnetic ring with controllable electromagnetic force is used for adjusting the thickness of a gap oil film of a slipper friction pair, a plurality of annular deep grooves are processed on the surface of a swash plate, an electromagnetic ring with a coil wound below is embedded in the groove, an annular permanent magnet is embedded in the groove which is also processed on the bottom surface of the slipper, the magnetism of the surface of the swash plate is the same as that of the bottom surface of the slipper, a repulsive force of interaction is generated, and the thickness of the gap oil film of the slipper friction pair is adjusted by changing the current in the coil of the electromagnetic ring in the swash plate.
In order to achieve the purpose, the invention adopts the following technical scheme:
a surface of a swash plate is provided with an annular deep groove, an annular electromagnet is embedded into the annular deep groove, and a plurality of small cylindrical electromagnets are distributed below the annular electromagnet corresponding to a high-pressure oil action area (high-pressure area) of the swash plate; the surface of the small cylindrical electromagnet is wound with an electromagnetic coil; the bottom surface of the sliding shoe is provided with an annular groove, and an annular permanent magnet is embedded into the annular groove; the annular electromagnet and the annular permanent magnet have the same magnetism at the friction pair of the sliding shoe, and generate an electromagnetic repulsion force of interaction; after the electromagnetic coil is electrified, the annular electromagnet generates magnetism, and the magnetism of the annular electromagnet is controlled by changing the current in the electromagnetic coil.
The surface of the swash plate is provided with at least two concentric annular deep grooves, and correspondingly, the number of the annular electromagnets is corresponding to that of the annular deep grooves.
The position of the annular deep groove is intersected with the motion trail of the annular permanent magnet on the bottom surface of the sliding shoe.
The upper end surface of the annular electromagnet is slightly lower than the surface of the swash plate, so that a certain gap is reserved in the annular deep groove, and the abrasion phenomenon of the annular electromagnet is avoided.
Except the surfaces of the annular electromagnet and the small cylindrical electromagnet opposite to the sliding shoe, the other surfaces of the annular electromagnet and the small cylindrical electromagnet are covered with magnetic isolation materials, so that the electromagnet only keeps magnetism on the surface opposite to the sliding shoe, and magnetic repulsion only acting on the sliding shoe is generated.
The annular electromagnet and the small cylindrical electromagnet are integrally formed by the same material.
The magnetic isolation material is filled outside the electromagnetic coil of the small cylindrical electromagnet, so that the function of supporting and protecting the magnetic isolation is achieved, and the damage of magnetic materials such as the annular electromagnet and the like caused by the strength problem of the materials due to external high pressure is avoided.
The annular groove on the bottom surface of the sliding shoe is positioned at the outer side of the central oil chamber close to the edge.
The depth of the annular groove on the bottom surface of the sliding shoe is slightly larger than the thickness of the annular permanent magnet, so that the phenomenon that the annular permanent magnet is abraded when the sliding shoe and the swash plate move relatively is avoided.
The contact part between the annular permanent magnet on the bottom surface of the slipper and the inside of the slipper is covered by a magnetic isolation material, so that the annular permanent magnet only keeps magnetism on the surface opposite to the swash plate, and magnetic repulsion only acting on the swash plate is generated.
The controller converts the detected external parameters such as pressure, rotating speed, flow rate and the like into control signals, and converts the control signals into increasing/decreasing signals of the current in the electromagnetic coil through the power amplifier. Therefore, the size of the magnetic repulsion force between the swash plate annular electromagnet and the slipper shoe annular permanent magnet is controlled, the current is increased/decreased, the magnetic repulsion force is increased/decreased, and the thickness of an oil film between a swash plate high-pressure area and the slipper shoe is increased/decreased.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
the invention uses the electromagnetic ring with controllable magnetic force to adjust the thickness of the gap oil film of the sliding shoe friction pair, processes a plurality of ring-shaped deep grooves on the surface of the swash plate, embeds the small cylindrical electromagnet and the ring-shaped electromagnet which are wound with the coil into the deep grooves, processes the ring-shaped grooves on the bottom surface of the sliding shoe to embed the ring-shaped permanent magnet, makes the magnetism of the surface of the swash plate identical with that of the bottom surface of the sliding shoe, generates the repulsive force of interaction, and realizes the adjustment of the thickness of the gap oil film of the sliding shoe friction pair by changing the current in the ring-shaped electromagnet coil in the swash plate.
The invention can improve the lubricating property of the oil film to a certain extent by increasing the magnetic repulsion force, increase the supporting force of the oil film on the surface of the slipper friction pair, reduce the friction between the slipper and the swash plate, and improve the dynamic stability of the swash plate-slipper assembly, thereby improving the lubricating property of the slipper friction pair and prolonging the service life of the plunger pump.
The invention actively controls the oil film thickness of the sliding shoe friction pair through structural design, improves the dynamic pressure lubrication performance of the sliding shoe friction pair, and has the advantages of clear structure and good economical efficiency. In addition, the structure also has the characteristic of wide applicability, and annular electromagnets and electromagnetic coils with different sizes and shapes can be selected according to different working conditions, so that the swash plate-slipper assembly has excellent working performance.
Drawings
FIG. 1 is a schematic view of the overall construction of a swash plate-slipper assembly;
FIG. 2 is a schematic top view of the swash plate-slipper assembly;
FIG. 3 is a schematic cross-sectional view A-A of the swash plate-slipper assembly;
FIG. 4 is a schematic cross-sectional view B-B of the swash plate-slipper assembly;
FIG. 5 is a schematic bottom view of the slipper;
FIG. 6 is a schematic cross-sectional view of a slipper;
FIG. 7 is a schematic view of the overall structure of an electromagnet;
fig. 8 is an operation principle diagram of an electromagnet.
Reference numerals: the magnetic control sliding shoe comprises a swash plate 1, a sliding shoe 2, an annular permanent magnet 3, an annular electromagnet 4, an electromagnetic coil 5, a small cylindrical electromagnet 6 and a magnetic isolation material 7.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.
As shown in fig. 1 to 7, the present embodiment provides a swash plate-slipper assembly of a controllable electromagnetic composite supported axial plunger pump, including a swash plate and a slipper.
An annular groove is processed on the outer side of a central oil chamber at the bottom surface of the sliding shoe 2 close to the edge, an annular permanent magnet 3 is embedded into the annular groove, the depth of the annular groove is slightly larger than the thickness of the annular permanent magnet 3, and the phenomenon that the annular permanent magnet 3 is abraded when the sliding shoe 2 moves relative to the swash plate 1 is avoided. The contact part between the annular permanent magnet 3 and the inside of the slipper 2 is covered by a magnetic isolation material, so that the annular permanent magnet 3 only keeps magnetism on the surface opposite to the swash plate 1, and magnetic repulsion acting only on the swash plate 1 is generated.
Two or more annular deep grooves are processed on the surface of the swash plate 1, and the positions of the annular deep grooves and the motion trail of the annular permanent magnet 3 on the bottom surface of the sliding shoe 2 are intersected. An annular electromagnet 4 is embedded in the annular deep groove, the outer surface of the annular electromagnet 4 is slightly lower than the surface of the swash plate 1, and a certain space is reserved to avoid the abrasion phenomenon of the annular electromagnet 4.
A plurality of small cylindrical electromagnets 6 are uniformly distributed below an annular electromagnet 4 corresponding to a high-pressure oil action area (high-pressure area) of the swash plate 1, and the annular electromagnet 4 and the small cylindrical electromagnets 6 are integrally formed by adopting the same material. The small cylindrical electromagnet 6 is wound with an electromagnetic coil 5 on the surface, so that the annular electromagnet 4 generates magnetism after the electromagnetic coil 5 is electrified.
Except the surfaces of the annular electromagnet 4 and the small cylindrical electromagnet 6 opposite to the sliding shoe 2, the other surfaces of the annular electromagnet and the small cylindrical electromagnet are covered with a magnetic isolation material, so that the electromagnet only keeps magnetism on the surface opposite to the sliding shoe 2, and magnetic repulsion acting only on the sliding shoe 2 is generated. In the annular deep groove, the electromagnetic coil 5 wound by the small cylindrical electromagnet 6 is filled with a magnetism isolating material.
The annular electromagnet 4 and the annular permanent magnet 3 on the bottom surface of the sliding shoe 2 have the same magnetism at a sliding shoe friction pair, an electromagnetic repulsion force of interaction is generated, and the magnitude of the magnetism of the annular electromagnet 4 is controlled by changing the magnitude of current in the electromagnetic coil 5.
The working principle of the invention is as follows:
as shown in fig. 8, the controller mainly converts the detected external parameters such as pressure, rotation speed, flow rate, etc. into control signals, and converts the control signals into increasing/decreasing signals of the current in the solenoid coil 5 through the power amplifier, and when the external parameters such as pressure, rotation speed, flow rate, etc. increase, the corresponding control increases the current in the solenoid coil 5, and conversely, when the external parameters such as pressure, rotation speed, flow rate, etc. decrease, the corresponding control decreases the current in the solenoid coil 5. Therefore, the size of the magnetic repulsion between the annular electromagnet 4 embedded in the swash plate 1 and the annular permanent magnet 3 embedded in the sliding shoe 2 is controlled, the current is increased/decreased, the magnetic repulsion is increased/decreased, and the thickness of an oil film between a high-pressure area of the swash plate 1 and the sliding shoe 2 is increased/decreased.
According to the invention, a plurality of annular deep grooves are processed on the surface of the swash plate 1, a small cylindrical electromagnet 6 wound with an electromagnetic coil 5 and an annular electromagnet 4 are embedded in the groove, an annular groove is also processed on the bottom surface of the slipper 2 and an annular permanent magnet 3 is embedded in the groove, the surface of the swash plate 1 and the bottom surface of the slipper 2 are same in magnetism, a repulsive force of interaction is generated, and the adjustment of the thickness of an oil film in a gap of a slipper friction pair is realized by changing the magnitude of current in an annular electromagnet 4 coil in the swash plate 1. The oil film at the sliding shoe friction pair of the high-pressure area of the swash plate 1 is small in thickness and easy to wear, the lubricating property of the oil film can be improved to a certain extent by increasing the magnetic repulsion force, the supporting force of the oil film on the surface of the sliding shoe friction pair is increased, the friction between the sliding shoe 2 and the swash plate 1 is reduced, and the dynamic stability of the swash plate-sliding shoe assembly is improved, so that the lubricating property of the sliding shoe friction pair is improved, and the service life of the plunger pump is prolonged.
The above description is only a preferred embodiment of the present invention, and therefore should not be taken as limiting the scope of the invention, which is defined by the appended claims.
Claims (10)
1. A controllable electromagnetic composite supporting axial plunger pump swash plate-piston shoe assembly is characterized in that: the surface of the swash plate is provided with an annular deep groove, an annular electromagnet is embedded in the annular deep groove, and a plurality of small cylindrical electromagnets are distributed below the annular electromagnet corresponding to a high-pressure oil action area of the swash plate; the surface of the small cylindrical electromagnet is wound with an electromagnetic coil; the bottom surface of the sliding shoe is provided with an annular groove, and an annular permanent magnet is embedded into the annular groove; the annular electromagnet and the annular permanent magnet have the same magnetism at the friction pair of the sliding shoe, and generate an electromagnetic repulsion force of interaction; after the electromagnetic coil is electrified, the annular electromagnet generates magnetism, and the magnetism of the annular electromagnet is controlled by changing the current in the electromagnetic coil.
2. A controllable electromagnetic compound supported swash plate-slipper assembly for axial piston pumps as described in claim 1, wherein: the surface of the swash plate is provided with at least two concentric annular deep grooves, and correspondingly, the number of the annular electromagnets is corresponding to that of the annular deep grooves.
3. A controllable electromagnetic compound supported swash plate-slipper assembly for axial piston pumps as described in claim 1, wherein: the position of the annular deep groove is intersected with the motion trail of the annular permanent magnet on the bottom surface of the sliding shoe.
4. A controllable electromagnetic compound supported swash plate-slipper assembly for axial piston pumps as described in claim 1, wherein: the upper end surface of the annular electromagnet is slightly lower than the surface of the swash plate, so that a certain gap is reserved in the annular deep groove.
5. A controllable electromagnetic compound supported swash plate-slipper assembly for axial piston pumps as described in claim 1, wherein: except the surfaces of the annular electromagnet and the small cylindrical electromagnet, which are opposite to the sliding shoe, the other surfaces are covered with magnetic isolation materials.
6. A controllable electromagnetic compound supported swash plate-slipper assembly for axial piston pumps as described in claim 1, wherein: the annular electromagnet and the small cylindrical electromagnet are integrally formed by the same material.
7. A controllable electromagnetic compound supported swash plate-slipper assembly for axial piston pumps as described in claim 1, wherein: and a magnetic isolation material is filled outside the electromagnetic coil of the small cylindrical electromagnet.
8. A controllable electromagnetic compound supported swash plate-slipper assembly for axial piston pumps as described in claim 1, wherein: the annular groove on the bottom surface of the sliding shoe is positioned at the outer side of the central oil chamber close to the edge.
9. A controllable electromagnetic compound supported swash plate-slipper assembly for axial piston pumps as described in claim 1, wherein: the depth of the annular groove on the bottom surface of the sliding shoe is slightly larger than the thickness of the annular permanent magnet.
10. A controllable electromagnetic compound supported swash plate-slipper assembly for axial piston pumps as described in claim 1, wherein: and the contact part of the annular permanent magnet on the bottom surface of the sliding shoe and the inside of the sliding shoe is covered by a magnetic isolation material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111024812.6A CN113738640B (en) | 2021-09-02 | 2021-09-02 | Controllable electromagnetic composite supporting axial plunger pump swash plate-piston shoe assembly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111024812.6A CN113738640B (en) | 2021-09-02 | 2021-09-02 | Controllable electromagnetic composite supporting axial plunger pump swash plate-piston shoe assembly |
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| Publication Number | Publication Date |
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| CN113738640A CN113738640A (en) | 2021-12-03 |
| CN113738640B true CN113738640B (en) | 2022-04-19 |
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| CN202111024812.6A Active CN113738640B (en) | 2021-09-02 | 2021-09-02 | Controllable electromagnetic composite supporting axial plunger pump swash plate-piston shoe assembly |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114165401B (en) * | 2021-12-10 | 2022-10-21 | 厦门大学 | Electromagnetic torque adjustable pose self-adaptive compensation axial plunger pump cylinder body assembly |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101949384A (en) * | 2010-09-16 | 2011-01-19 | 陶亚平 | Axial plunger body |
| DE102012222464A1 (en) * | 2012-12-06 | 2014-06-12 | Robert Bosch Gmbh | Axial bearing, particularly active magnet bearing for camshaft of high-pressure fuel pump, has two magnet rings and individual magnets inserted in bearing ring, where magnetic rings and individual magnets have same polarity |
| DE102013202618A1 (en) * | 2013-02-19 | 2014-08-21 | Robert Bosch Gmbh | Swash plate-type axial piston machine has pivot angle display device with indicator and actuator, where indicator-sided end of actuator is rotatably coupled with indicator through magnetic force transmission |
| JP6275502B2 (en) * | 2014-02-12 | 2018-02-07 | 川崎重工業株式会社 | Hydraulic rotating device shoe and hydraulic rotating device |
| CN207892783U (en) * | 2017-09-29 | 2018-09-21 | 四川省宜宾普什驱动有限责任公司 | The high rotating speed of high pressure, flow be controllable, electric proportional control hydraulic planger pump |
| CN107725301B (en) * | 2017-11-10 | 2023-07-25 | 安徽理工大学 | Axial plunger pump and magnetic sliding shoe pair for motor and control method |
| JP2020016150A (en) * | 2018-07-23 | 2020-01-30 | 株式会社小松製作所 | Swash plate type piston pump/motor |
| DE102019120526A1 (en) * | 2019-07-30 | 2021-02-04 | Linde Hydraulics Gmbh & Co. Kg | Hydrostatic axial piston machine and process for its manufacture |
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