WO2021143526A1 - 微型泵 - Google Patents
微型泵 Download PDFInfo
- Publication number
- WO2021143526A1 WO2021143526A1 PCT/CN2020/141181 CN2020141181W WO2021143526A1 WO 2021143526 A1 WO2021143526 A1 WO 2021143526A1 CN 2020141181 W CN2020141181 W CN 2020141181W WO 2021143526 A1 WO2021143526 A1 WO 2021143526A1
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- WO
- WIPO (PCT)
- Prior art keywords
- bearing
- cavity
- groove
- rotor
- stator
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/0673—Units comprising pumps and their driving means the pump being electrically driven the motor being of the inside-out type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/046—Bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/046—Bearings
- F04D29/047—Bearings hydrostatic; hydrodynamic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/046—Bearings
- F04D29/047—Bearings hydrostatic; hydrodynamic
- F04D29/0473—Bearings hydrostatic; hydrodynamic for radial pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/046—Bearings
- F04D29/048—Bearings magnetic; electromagnetic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2205—Conventional flow pattern
- F04D29/2222—Construction and assembly
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps
Definitions
- This application relates to the technical field of micro pumps, and in particular to a micro pump.
- Micropumps are not only small in size, but also complex in structure and highly integrated, including electrical, fluid, and mechanical components. Because the structure of the micropump is very compact, its bearing system is connected with the liquid cavity, which causes the lubricating oil in the bearing system to be diluted by the working fluid, loss of lubrication ability, direct friction between the shaft and the bearing, and the pump life and noise are greatly deteriorated. Most of the current solutions adopt dynamic sealing, using packing or sealing ring to separate the bearing from the fluid, but this method has poor sealing ability, and the friction between the shaft and the seal will reduce the motor's drive to the impeller output. Force, greatly reduce the performance of the micro pump.
- the ball bearing used in the micro pump in the prior art a spherical alloy steel ball is installed between the inner steel ring and the outer steel ring, and the middle is filled with grease to reduce the friction in the power transmission process and improve the mechanism by rolling. Transmission efficiency of power.
- the ball bearing has the following disadvantages. First, the grease used in the ball bearing in the long-term operation of the micropump will be easily washed away in water and cause failure; second, due to wear, the life of the ball bearing will be lower; Third, due to wear, it will cause greater noise; fourth, the accuracy of traditional processing and assembly processes is low, which will reduce the overall characteristics of the micropump.
- the ceramic bearings used in the micro pumps in the prior art utilize the wear resistance of ceramics to improve the life and reliability of the bearing system.
- the ceramic bearing has the following shortcomings. First, the end face of the ceramic bearing and the lower wear-resistant plate are worn, which will cause greater noise; second, the accuracy of the traditional processing and assembly process is low, which will lead to the overall characteristics of the micropump reduce.
- the present application provides a micro pump to solve the technical problems of easy wear, short life, high noise, and low precision of bearing components in the micro pump in the prior art.
- the present application provides a miniature pump including a housing, a rotor system, and a stator system.
- the housing has a stator cavity and a rotor cavity that are not connected to each other.
- the stator system is disposed in the stator cavity, and the rotor system Is arranged in the rotor cavity, the rotor system rotates relative to the stator system;
- the rotor system has a rotor component and a bearing component, the bearing component is installed in the rotor cavity, and the rotor component is installed in the
- the bearing component is mounted on and rotates with the bearing component;
- the bearing component has a bearing and a shaft center, the shaft center is fixed at the bottom of the rotor cavity, the bearing is sleeved on the shaft center, and the There is a gap between the bearing and the shaft center;
- the bottom surface of the bearing faces the bottom of the rotor cavity, and the bottom surface is provided with a plurality of grooves extending from the outer circumference
- the multiple grooves on the bottom surface of the bearing and the gap between the bearing and the shaft center are utilized.
- the bearing component works, the working fluid in the rotor cavity flows into the gap and the groove, forming in the gap
- the stable liquid film creates a hydrodynamic pressure difference between the groove and the bottom of the groove, so that in the axial direction, the bearing can be suspended in the working fluid in the rotor cavity due to the buoyancy of the liquid film, and the rotor system can also be suspended in the working fluid.
- the bearing parts of the miniature pump are free of wear and noise during operation.
- the center line of the notch of the groove and the center line of the groove bottom of the groove both pass through the center of the shaft center and form an angle with each other.
- the grooves are arc-shaped, and the notch of each groove is curved in the same direction in the circumferential direction of the bottom surface of the bearing relative to the bottom of the groove. .
- the working fluid flows more smoothly in the grooves.
- the fluid dynamic pressure applied by the working fluid to the bottom of the groove points to the axis, so that the gap The liquid film is more stable, and the liquid film between the bearing and the shaft is also more stable.
- the inner diameter of the notch of the groove is larger than the inner diameter of the groove bottom of the groove.
- the inner diameter of the groove gradually decreases from the notch of the groove to the bottom of the groove.
- the shaft includes a rotating shaft and a gasket, the rotating shaft and the gasket are integrally formed, and the gasket is fixed to the bottom of the rotor cavity and is located at the bottom of the rotor cavity and the gasket.
- the gasket is fixed to the bottom of the rotor cavity and is located at the bottom of the rotor cavity and the gasket.
- a bearing hole is provided at the center of the bottom of the rotor cavity, and the rotating shaft is fixed in the bearing hole.
- the rotating shaft is reinforced in both the axial direction and the radial direction, and the vibration and displacement of the rotating shaft in both directions are restricted.
- the rotor component includes an impeller and a permanent magnet
- the impeller has a wheel face and a hub
- the wheel face is sleeved on the outer wall of the bearing
- the hub is located between the wheel face and the hub.
- the permanent magnet is installed on the inner ring of the hub close to the axis;
- the stator system includes a motor stator and a stator winding, the motor stator is fixed in the stator cavity, so The stator winding surrounds the motor stator and is arranged on the side wall of the stator cavity; the permanent magnet surrounds the periphery of the stator winding.
- the stator and stator windings of the motor generate an alternating magnetic field.
- the permanent magnet drives the impeller to rotate under the action of the alternating magnetic field.
- the rotation of the impeller does work on the working fluid and drives the working fluid to flow, so that the rotor system is in diameter. It can be suspended in the working fluid in the direction to achieve the technical effect of no wear and no noise.
- the axial position of the permanent magnet is different from the axial position of the stator system.
- the rotor system is subjected to a magnetic force directed to the stator system in the axial direction. In this way, the rotor system can be suspended in the rotor cavity in the axial direction to achieve the technical effect of no wear and noise.
- the inner ring of the hub is provided with an annular groove, and a motor shell is fixed in the annular groove, and the motor shell is located between the inner ring of the hub and the permanent magnet.
- the rigidity of the motor housing is used to increase the rigidity of the hub of the impeller.
- the impeller, the motor housing and the bearing are integrally formed.
- the housing includes a volute and a base, and the volute and the base are connected and fixed together by a fixing component; the volute has a volute cavity, and the base has a base cavity and the base.
- the surface of the volute facing the base is further provided with a sealing groove not communicating with the cavity of the volute, and a sealing element is provided in the sealing groove.
- the shaft center has a rotating shaft and a spacer, the rotating shaft and the spacer are integrally formed, and the rotating shaft, the spacer and the base are integrally formed.
- the groove can be The bottom of the groove generates a higher hydrodynamic pressure, which makes the liquid film formed between the bearing and the gasket in the axial direction more stable, and forms a more stable liquid film in the gap between the shaft and the shaft in the radial direction.
- the rotor system is suspended in the working fluid in both the axial and radial directions, without wear And noise;
- the assembly accuracy of the micro pump can be effectively improved to ensure the hydraulic performance of the micro pump and lower vibration and noise.
- FIG. 1 is an exploded view of a micro pump provided in Embodiment 1 of the application;
- FIG. 2 is a cross-sectional view of a micro pump provided in Embodiment 1 of the application;
- FIG. 3 is a perspective view of a rotor component in a miniature pump provided in Embodiment 1 of the application; FIG.
- FIG. 4 is a perspective view and a partially enlarged cross-sectional view of a bearing component in a miniature pump provided by Embodiment 1 of the application;
- FIG. 5 is a perspective view of a bearing in a miniature pump provided in Embodiment 1 of the application;
- FIG. 6 is a schematic diagram of the force of the rotor system in a micro pump provided in Embodiment 1 of the application.
- Figure 1 is an exploded view of a micro pump provided in Example 1 of this application
- Figure 2 is a cross-sectional view of a micro pump provided in Example 1 of this application
- Application Example 1 provides a three-dimensional view of the rotor component in a micro pump
- Figure 4 is a perspective view and a partial enlarged cross-sectional view of a bearing component in a micro pump provided in Example 1 of the application
- Figure 5 is an embodiment of the application 1 provides a perspective view of a bearing in a micro pump
- FIG. 6 is a schematic diagram of a force on a rotor system in a micro pump provided in Example 1 of the application.
- the embodiment of the present application provides a micro pump, which has magnetic and hydraulic support, so that it will not produce mechanical friction during work, and has a simple structure, which greatly improves performance, service life, and Vibration and noise generated during work.
- the micro pump of this embodiment includes a housing 1, a rotor system 2 and a stator system 3.
- the housing 1 has a stator cavity 122 and a rotor cavity that are not connected to each other.
- the stator system 3 is arranged in the stator cavity 122, the rotor system 2 is arranged in the rotor cavity, and the rotor system 2 rotates relative to the stator system 3, in the rotor cavity Filled with working fluid.
- the housing 1 is designed as two detachable parts, including a volute 11 and a base 12, and the volute 11 and the base 12 are connected and fixed together by a fixing assembly 5.
- the housing 1 is designed as two detachable parts, so that the user can maintain, clean, and assemble and disassemble the interior of the housing 1 easily.
- the volute 11 has a volute cavity 111
- the base 12 has a base cavity 121 and a stator cavity 122.
- the volute cavity 111 communicates with the base cavity 121 to form a rotor cavity, which provides space for the rotor system 2 and the working fluid.
- the base cavity 121 surrounds the stator
- the cavity 122, the stator cavity 122 is an annular structure located inside the base cavity 121 and separated from the base cavity 121.
- An inlet pipe 125 and an outlet pipe 126 are also provided on the base cavity 121, and the inlet pipe 125 and the outlet pipe 126 are used to provide passages for the working fluid to enter and exit the micro pump.
- the surface of the volute 11 facing the base 12 is further provided with a sealing groove 112 that is not connected to the volute cavity 111, and a sealing member 113 is provided in the sealing groove 112. Since the rotor system 2 rotates at a high speed in the rotor cavity formed by the volute cavity 111 and the base cavity 121, it will drive the working fluid to make centrifugal movement.
- the sealing groove 112 and the seal 113 can effectively prevent the working fluid from being thrown out of the rotor cavity due to centrifugal movement. And leaked.
- the rotor system 2 has a rotor component 21 and a bearing component 22.
- the bearing component 22 is installed in the rotor cavity and fixed to the bottom of the base cavity 121, and is located at the center of the inner side of the stator cavity 122.
- the component 21 is mounted on the bearing component 22 and rotates with the bearing component 22.
- the bearing component 22 has a bearing 221 and a shaft 222, the shaft 222 is fixed at the bottom of the rotor cavity, the bearing 221 is sleeved on the shaft 222, there is a gap between the bearing 221 and the shaft 222, the bearing 221 and the shaft
- the core 222 is made of ceramic material; the bottom surface of the bearing 221 faces the bottom of the rotor cavity, and the bottom surface is provided with a plurality of grooves 2211 extending from the outer circumference of the bottom surface to the inner circumference of the bottom surface, and the plurality of grooves 2211 are arranged around the shaft core 222
- the notch of the groove 2211 is connected to the outer circumference of the bottom surface and communicates with the rotor cavity, and there is an interval 2212 between the groove bottom of the groove 2211 and the inner circumference of the bottom surface.
- a plurality of grooves 2211 are provided on the bottom surface of the bearing 221.
- the plurality of grooves 2211 do not penetrate the inner circumference of the bottom surface and form a spiral shape.
- the plurality of spiral grooves 2211 are equally spaced along the circumferential direction of the bottom surface of the bearing 221.
- the arrangement is rotationally symmetrical about the axis 222.
- a higher hydrodynamic pressure is generated, thereby generating a low pressure area at the notch of the groove 2211, and a high pressure area at the bottom of the groove 2211, so that the working fluid has a hydraulic pressure outward from the shaft 222 to the bearing 221
- the thrust force is used to form a more stable liquid film at the gap between the bearing 221 and the shaft 222, so that the bearing 221 can be suspended in the working fluid in the radial direction, and there is no mechanical friction between the bearing 221 and the shaft 222.
- the shaft 222 has a shaft 2221 and a gasket 2222.
- the shaft 2221 and the gasket 2222 are integrally formed.
- the shaft 2221 and the gasket 2222 are integrally formed with the base 12 to ensure the assembly accuracy of the shaft 222 and the base 12.
- a plurality of spiral grooves 2211 are formed on the bottom surface of the bearing 221 and the gap between the bearing 221 and the shaft 222.
- the groove 2211 forms a stable liquid film in the gap, and a fluid dynamic pressure difference is formed between the notch and the bottom of the groove 2211, so that in the axial direction, the bearing 221 can be suspended in the rotor cavity due to the buoyancy of the liquid film.
- the rotor system 2 can also be suspended in the working liquid in the rotor cavity, so that the bearing component 22 of the micropump is free from wear and noise during operation.
- the center line of the notch of the groove 2211 and the center line of the groove bottom of the groove 2211 both pass through the center of the shaft 222 and are at an angle to each other.
- the bottom surface of the bearing 221 is in the shape of a ring with an inner periphery and an outer periphery, and a plurality of radial lines extend outward from the shaft center 222, and are arranged in a plurality of grooves 2211 on the bottom surface of the bearing 221, each The center line of the notch of the groove 2211 and the center line of the groove bottom of the groove 2211 are respectively on the same straight line with different radial lines, that is, they are at an angle to each other.
- the groove 2211 is arc-shaped, and the notch of each groove 2211 is curved in the same direction in the circumferential direction of the bottom surface of the bearing 221 relative to the groove bottom of the groove 2211.
- the bending direction of the groove 2211 is the same as the rotation direction of the rotor system 2
- the working fluid flows into the groove 2211, exerting dynamic pressure on the inner wall and the groove bottom of the groove 2211.
- the bending direction of the groove 2211 is opposite to the rotation direction of the rotor system 2
- the working fluid is sucked into the groove 2211, and dynamic pressure is also applied to the inner wall and the groove bottom of the groove 2211.
- the working fluid flows more smoothly in the groove 2211.
- the fluid dynamic pressure applied by the working fluid to the bottom of the groove 2211 is directed to the axis 222. , So that the liquid film at the gap is more stable, and the liquid film between the bearing 221 and the shaft 222 is also more stable.
- the inner diameter of the notch of the groove 2211 is greater than the inner diameter of the groove bottom of the groove 2211, that is, the radius of curvature of the inner arc surface of the groove 2211 is smaller than the radius of curvature of the outer arc surface.
- the working fluid is more likely to flow into the groove 2211 through the notch of the groove 2211, and the flow velocity of the working fluid at the bottom of the groove 2211 is faster than the flow velocity at the notch of the groove 2211. It is easier to form a higher hydrodynamic pressure difference between the notch of the groove 2211 and the bottom of the groove.
- the inner diameter of the groove 2211 gradually decreases from the notch of the groove 2211 to the bottom of the groove 2211. Specifically, along the radial direction passing through the center line of the shaft core 222, the closer to the inner circumference of the bottom surface of the bearing 221, the smaller the inner diameter of the groove 2211, so that the flow rate of the working fluid in the groove 2211 changes from the groove 2211. Gradually speed up from the mouth to the bottom of the groove, and the working fluid will uniformly increase the hydrodynamic pressure of the groove 2211, which is more conducive to the formation of a stable hydrodynamic pressure difference between the groove 2211 and the groove bottom, thereby forming a stable gap at the gap. ⁇ The liquid film.
- the shaft 222 includes a rotating shaft 2221 and a gasket 2222.
- the rotating shaft 2221 and the gasket 2222 are integrally formed.
- the gasket 2222 is fixed to the bottom of the rotor cavity and located between the bottom of the rotor cavity and the bottom surface of the bearing 221.
- the bottom surface of the bearing 221 There is a gap between the spacer 2222 and the inner wall of the bearing 221 and the outer wall of the shaft 222.
- the shaft 222 has two parts, one is a shaft 2221 that passes through the center of the bearing 221 and is fixed at the bottom of the rotor cavity, and the other is sleeved outside the shaft 2221 and integrated with it.
- the gasket 2222 formed between the bottom surface of the bearing 221 and the bottom of the rotor cavity forms a liquid film at the gap between the bearing 221 and the gasket 2222, the bearing 221 and the shaft 2221 when the rotor system 2 rotates, so that The bearing 221 can be completely suspended in the working fluid without mechanical friction and noise.
- the gasket 2222 can also reinforce the shaft 2221 in the radial direction, and limit the vibration of the shaft 2221 in the radial direction during the rotation.
- the gasket 2222 protects the bottom of the rotor cavity from the working fluid in the axial direction. The erosion and abrasion of the micro-pump can improve the service life of the micro-pump.
- a bearing hole 124 is provided in the center of the bottom of the rotor cavity, and the rotating shaft 2221 is fixed in the bearing hole 124.
- the bearing hole 124 is recessed in the center of the bottom of the rotor cavity, and the rotating shaft 2221 is embedded and fixed in the bearing hole 124.
- the bearing hole 124 strengthens the rotating shaft 2221 in both the axial direction and the radial direction, and restricts the rotating shaft 2221. Vibration and displacement in two directions.
- the rotor component 21 includes an impeller 211 and a permanent magnet 212.
- the impeller 211 has a wheel face 2111 and a hub 2112.
- the wheel face 2111 is sleeved on the outer wall of the bearing 221.
- the hub 2112 is located between the wheel face 2111 and the rotor cavity.
- the permanent magnet 212 is installed in the inner ring of the hub 2112 close to the axis 222;
- the stator system 3 includes a motor stator 31 and a stator winding 32.
- the motor stator 31 and the stator winding 32 are installed in a closed stator cavity 122.
- the motor stator 31 is fixed in the stator cavity 122, the stator winding 32 surrounds the motor stator 31 and is arranged on the side wall of the stator cavity 122, and the permanent magnet 212 surrounds the periphery of the stator winding 32.
- the base 12 is provided with a controller slot 123, and the controller 4 is set in the controller slot 123 of the base 12 and connected to the stator system 3.
- the controller 4 When the controller 4 is powered on, the stator winding 32 introduces current and connects with the motor stator 31 The alternating magnetic field is generated together, and the stator system 3 can effectively achieve electrical insulation because it does not contact the working fluid.
- the motor stator 31 and the stator winding 32 generate an alternating magnetic field.
- the permanent magnet 212 drives the impeller 211 to rotate under the action of the alternating magnetic field, and the impeller 211 rotates to perform work on the working fluid.
- the working fluid is driven to flow, so that the rotor system 2 can be suspended in the working fluid in the radial direction, and the technical effect of no wear and no noise is achieved.
- the axial position of the permanent magnet 212 is different from the axial position of the stator system 3. Specifically, in the axial direction, the horizontal center plane of the permanent magnet 212 and the horizontal center plane of the stator system 3 are not the same plane, and relative to the bottom of the rotor cavity, the position of the permanent magnet 212 is slightly higher than that of the stator system 3. Position, so that the rotor system 2 receives a magnetic force directed to the stator system 3 in the axial direction, so that the rotor system 2 can be suspended in the rotor cavity in the axial direction to achieve the technical effect of no wear and noise.
- the inner ring of the hub 2112 is provided with an annular groove 2113, and a motor housing 213 is fixed in the annular groove 2113.
- the motor housing 213 is located between the inner ring of the hub 2112 and the permanent magnet 212.
- the rigid motor housing 213 is used to improve the impeller. 211 the hardness of the hub 2112.
- the impeller 211, the motor housing 213 and the bearing 221 are integrally formed to ensure the assembly accuracy of the rotor component 21 and the bearing 221.
- the micro pump of this embodiment When the micro pump of this embodiment is in use, after the controller 4 is powered on, current is introduced into the stator winding 32 to generate an alternating magnetic field.
- the permanent magnet 212 drives the impeller 211 to rotate under the action of the alternating magnetic field, and the working fluid is introduced from the inlet.
- the tube 125 flows into the rotor cavity formed by the base cavity 121 and the volute cavity 111.
- the rotating impeller 211 does work on the working fluid, which increases the total pressure of the working fluid and flows out from the outlet pipe 126, so that the micropump generates and drives the working fluid to flow.
- Ability When the micro pump of this embodiment is in use, after the controller 4 is powered on, current is introduced into the stator winding 32 to generate an alternating magnetic field.
- the permanent magnet 212 drives the impeller 211 to rotate under the action of the alternating magnetic field, and the working fluid is introduced from the inlet.
- the tube 125 flows into the rotor cavity formed by the base cavity 121 and
- the bearing 221 rotates with the rotor system 2, and the working fluid enters from the slot of the groove 2211, and enters the bottom of the groove 2211 along the inner wall of the groove 2211, and is blocked by the inner wall of the groove 2211, resulting in higher liquid Dynamic Pressure. Therefore, a low pressure area is generated at the notch of the groove 2211, and a high pressure area is generated at the bottom of the groove 2211, so the working fluid has an outward hydraulic thrust on the bearing 221; at the same time, because the permanent magnet 212 and the stator system 3 The center lines are not in the same position, so the stator system 3 has a magnetic attraction force to the rotor system 2 pointing towards the stator system 3.
- the magnetic force can be adjusted.
- the buoyancy, hydraulic pressure, and gravity of the rotor system 2 are analyzed, and a reasonable distance is designed so that the rotor system 2 can be suspended in the liquid under the support of magnetic force and hydraulic pressure, without mechanical friction and noise.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
一种微型泵,包括壳体(1)、转子***(2)和定子***(3),壳体(1)具有互不连通的定子腔(122)和转子腔,定子***(3)设置在定子腔(122)中,转子***(2)设置在转子腔中,转子***(2)相对于定子***(3)转动;转子***(2)具有转子部件(21)和轴承部件(22),轴承部件(22)安装于转子腔中,转子部件(21)安装在轴承部件(22)上并随着轴承部件(22)转动;轴承部件(22)具有轴承(221)和轴心(222),轴心(222)固定于转子腔的底部,轴承(221)套设在轴心(222)上,轴承(221)与轴心(222)之间具有间隙;轴承(221)的底面面朝转子腔的底部,底面上设置有自底面的外周向底面的内周延伸的多个凹槽(2211),多个凹槽(2211)环绕轴心(222)排布,凹槽(2211)的槽口与底面的外周连接并与转子腔连通,凹槽(2211)的槽底与底面的内周之间具有间隔(2212)。
Description
本申请要求于2020年1月13日提交中国专利局、申请号为CN202010032260.2、申请名称为“微型泵”的中国专利申请的优先权,其全部内容通过引用结合在本申请中。
本申请涉及微型泵技术领域,特别涉及一种微型泵。
随着各种器件向小型化、集成化的方向不断发展,作为驱动流体流动的核心功能器件,泵的微型化需求日益迫切。以电子器件散热***为例,诸如笔记本电脑、平板电脑等便携电子设备的性能不断增长,发热量越来越大,而产品厚度却越来越小,面临着严峻的散热问题。液冷散热***作为下一代散热技术,能够提供比传统风冷散热***更高的散热性能,而其核心驱动部件泵的厚度成为其应用于这些电子产品中的一大阻碍。
微型泵不仅尺寸小,而且结构复杂、集成度高,包括电气、流体、机械等部件。由于微型泵的结构十分紧凑,其轴承***与液体腔连通,导致轴承***中的润滑油被工作液体稀释,丧失润滑能力,轴心与轴承直接摩擦,泵的寿命和噪声大大恶化。目前的解决方案大多采用动密封的方式,使用填料或者密封圈将轴承与流体隔开,但是这种方式的密封能力较差,而且轴与密封件之间的摩擦会降低电机对叶轮输出的驱动力,使微型泵的性能大大降低。
现有技术中微型泵所使用的滚珠轴承,其将球形合金钢珠安装在内钢圈和外钢圈的中间,中间填充有润滑脂,以滚动方式来降低动力传递过程中的摩擦力和提高机械动力的传递效率。但该滚珠轴承具有以下缺点,第一,应用于微泵中长期运行时滚珠轴承的润滑脂浸泡在水中易被冲走,导致失效;第二,由于磨损,会导致滚珠轴承寿命较低;第三,由于磨损,会导致噪音较大;第四,传统的加工和装配工艺的精度较低,会导致微泵的整体特性降低。
现有技术中微型泵所使用的陶瓷轴承,其利用陶瓷的耐磨性,提高轴承***的寿命和可靠性。但是,该陶瓷轴承具有以下缺点,第一,陶瓷轴承端面与下方耐磨片存在磨损,会导致噪音较大;第二,传统的加工和装配工艺的精度较低,会导致微泵的整体特性降低。
发明内容
本申请提供了一种微型泵,以解决现有技术中微型泵中的轴承部件易磨损、寿命短、噪音大、精度低的技术问题。
本申请提供了一种微型泵,包括壳体、转子***和定子***,所述壳体具有互不连通的定子腔和转子腔,所述定子***设置在所述定子腔中,所述转子***设置在所述转子腔中,所述转子***相对于所述定子***转动;所述转子***具有转子部件和轴承部件,所述轴承部件安装于所述转子腔中,所述转子部件安装在所述轴承部件上并随着所述轴承部件转动;所述轴承部件具有轴承和轴心,所述轴心固定于所述转子腔的底部,所述轴承套设在所述轴心上,所述轴承与所述轴心之间具有间隙;所述轴承的底面面朝所述转子腔的底部,所述底面上设置有自所述底面的外周向所述底面的内周延伸的多个凹槽,多个所述凹槽环绕所述轴心排布,所述凹槽的槽口与所述底面的外周连接并与所述转子腔连通,所述凹槽的槽底与所述底面的内周之间具有间隔。通过本实施例提供的方案,利用轴承的底面上的多个凹槽以及轴承与轴心之间的间隙,当轴承部件工作时,转子腔中的工作液体流入间隙和凹槽,在间隙中形成稳定的液膜,在凹槽的槽口和槽底形成液体动压差,使得在轴向方向上,轴承因液膜的浮力能够悬浮于转子腔的工作液体中,进而转子***也能够悬浮于转子腔的工作液体中,使得微型泵的轴承部件在工作时无磨损、无噪音。
在一种可能的设计中,所述凹槽的槽口的中心线和所述凹槽的槽底的中心线均穿过所述轴心的中心且互成角度。通过本实施例提供的方案,当轴承在转动时,转子腔中的工作液体更容易、更流畅地流入凹槽中,在工作液体流动过程中减少了工作液体与凹槽内壁之间的碰撞造成的动能损耗。
在一种可能的设计中,所述凹槽为弧形,且每个所述凹槽的槽口相对于所述凹槽的槽底在所述轴承的底面的圆周方向上朝同一个方向弯曲。通过本实施例提供的方案,使得工作液体在凹槽中的流动更加流畅,在每个凹槽中工作液体对凹槽的槽底所施加的液体动压方向均指向轴心,使得间隙处的液膜更加稳定,轴承与轴心之间的液膜也更加稳定。
在一种可能的设计中,所述凹槽的槽口的内径大于所述凹槽的槽底的内径。通过本实施例提供的方案,使得工作液体更容易通过凹槽的槽口流入凹槽,同时工作液体在凹槽的槽底处的流速比凹槽的槽口处的流速更快,更容易在凹槽的槽口和槽底之间形成较高的液体动压差。
在一种可能的设计中,所述凹槽的内径自所述凹槽的槽口至所述凹槽的槽底逐渐减小。通过本实施例提供的方案,使得工作液体在凹槽中的流速从槽口至槽底逐渐加快,工作液体对凹槽的液体动压均匀变大,更有利于在凹槽的槽口和槽底之间形成稳定的液体动压差,进而在间隙处形成稳定的液膜。
在一种可能的设计中,所述轴心包括转轴和垫片,所述转轴与所述垫片一体成型,所述垫片固定于所述转子腔的底部并位于所述转子腔的底部与所述轴承的底面之间,所述轴承的底面与所述垫片之间具有间隙,所述轴承的内壁和所述轴心的外壁之间具有间隙。通过本实施例提供的方案,利用垫片从径向方向上加固转轴,限制转轴在转动过程中在径向方向上产生的振动,同时垫片在轴向方向上保护转子腔的底部不受工作液体的侵蚀和磨损,提高微型泵的使用寿命。
在一种可能的设计中,所述转子腔的底部中心设有轴承孔,所述转轴固定于所述轴承孔中。通过本实施例提供的方案,在轴向方向上和径向方向上均对转轴进行加固, 限制转轴在两个方向上的振动和位移。
在一种可能的设计中,所述转子部件包括叶轮和永磁体,所述叶轮具有轮面和轮毂,所述轮面套设于所述轴承的外壁,所述轮毂位于所述轮面与所述转子腔的底部之间,所述永磁体安装于所述轮毂靠近所述轴心的内圈;所述定子***包括电机定子和定子绕组,所述电机定子固定在所述定子腔中,所述定子绕组环绕所述电机定子设置在所述定子腔的侧壁;所述永磁体环绕包围在所述定子绕组的***。通过本实施例提供的方案,通过电机定子和定子绕组在产生交变磁场,永磁体在交变磁场的作用下带动叶轮转动,叶轮旋转对工作液体做功,驱动工作液体流动,使得转子***在径向方向上能够悬浮在工作液体中,达到无磨损、无噪音的技术效果。
在一种可能的设计中,所述永磁体的轴向位置与所述定子***的轴向位置不同。通过本实施例提供的方案,使得转子***在轴向方向上受到一个指向定子***的磁力,这样,转子***在轴向方向上能够悬浮在转子腔中,达到无磨损、无噪音的技术效果。
在一种可能的设计中,所述轮毂的内圈设有环形槽,所述环形槽中固定有马达壳,所述马达壳位于所述轮毂的内圈与所述永磁体之间。通过本实施例提供的方案,利用具有硬度的马达壳来提高叶轮的轮毂的硬度。
在一种可能的设计中,所述叶轮、所述马达壳和所述轴承一体成型。通过本实施例提供的方案,保证转子部件和轴承的装配精度。
在一种可能的设计中,壳体包括蜗壳和底座,所述蜗壳和所述底座通过固定组件连接固定在一起;所述蜗壳具有蜗壳腔,所述底座具有底座腔和所述定子腔,所述蜗壳腔与所述底座腔连通形成所述转子腔,所述轴承部件固定于所述底座腔的底部,所述底座腔环绕包围所述定子腔。通过本实施例提供的方案,将壳体设计成可拆分的两个部件,便于用户对壳体内部进行维护、清洗和装卸。
在一种可能的设计中,所述蜗壳面朝所述底座的表面还设有与所述蜗壳腔不连通的密封槽,所述密封槽中设有密封件。通过本实施例提供的方案,可以有效防止工作液体泄露。
在一种可能的设计中,所述轴心具有转轴和垫片,所述转轴与所述垫片一体成型,所述转轴、所述垫片与所述底座一体成型。通过本实施例提供的方案,以保证轴心和底座的装配精度。
可见,在以上各个方面,通过在轴承上设置螺旋状排布的凹槽,并在轴承的底面与转子腔的底部之间的间隙处设置与轴承的底面平行的垫片,能够在凹槽的槽底产生较高的液体动压,使轴承在轴向方向上与垫片之间形成的液膜更加稳定,在径向方向上与轴心的转轴之间的间隙处形成更加稳定的液膜;通过将定子***的轴向位置和永磁体的轴向位置设计在不同位置,以及具有液压支承的轴承部件,使得转子***在轴向方向和径向方向上都悬浮在工作液体中,无磨损和噪音;通过采用叶轮与轴承一体成型、底座与轴心一体成型的结构和工艺,能够有效地提高微型泵的装配精度,以保证微型泵的水力性能和较低的振动和噪音。
图1为本申请实施例1提供的一种微型泵的***图;
图2为本申请实施例1提供的一种微型泵的截面图;
图3为本申请实施例1提供的一种微型泵中,转子部件的立体图;
图4为本申请实施例1提供的一种微型泵中,轴承部件的立体图及局部放大截面图;
图5为本申请实施例1提供的一种微型泵中,轴承的立体图;
图6为本申请实施例1提供的一种微型泵中,转子***的受力情况示意图。
附图标记:
1-壳体;
11-蜗壳;
111-蜗壳腔;
112-密封槽;
113-密封件;
12-底座;
121-底座腔;
122-定子腔;
123-控制器槽;
124-轴承孔;
125-进口管;
126-出口管;
2-转子***;
21-转子部件;
211-叶轮;
2111-轮面;
2112-轮毂;
2113-环形槽;
212-永磁体;
213-马达壳;
22-轴承部件;
221-轴承;
2211-凹槽;
2212-间隔;
222-轴心;
2221-转轴;
2222-垫片;
3-定子***;
31-电机定子;
32-定子绕组;
4-控制器;
5-固定组件。
为了更好的理解本申请的技术方案,下面结合附图对本申请实施例进行详细描述。
应当明确,所描述的实施例仅仅是本申请一部分实施例,而不是全部的实施例。基于本申请中的实施例,本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其它实施例,都属于本申请保护的范围。
本申请的实施方式部分使用的术语仅用于对本申请的具体实施例进行解释,而非旨在限定本申请。在本申请实施例和所附权利要求书中所使用的单数形式的“一种”、“所述”和“该”也旨在包括多数形式,除非上下文清楚地表示其他含义。
需要注意的是,本申请实施例所描述的“上”、“下”、“左”、“右”等方位词是以附图所示的角度来进行描述的,不应理解为对本申请实施例的限定。此外,在上下文中,还需要理解的是,当提到一个元件连接在另一个元件“上”或者“下”时,其不仅能够直接连接在另一个元件“上”或者“下”,也可以通过中间元件间接连接在另一个元件“上”或者“下”。
请参考附图1-6,其中,图1为本申请实施例1提供的一种微型泵的***图;图2为本申请实施例1提供的一种微型泵的截面图;图3为本申请实施例1提供的一种微型泵中,转子部件的立体图;图4为本申请实施例1提供的一种微型泵中,轴承部件的立体图及局部放大截面图;图5为本申请实施例1提供的一种微型泵中,轴承的立体图;图6为本申请实施例1提供的一种微型泵中,转子***的受力情况示意图。
如图1和图2所示,本申请实施例提供了一种微型泵,其具有磁力和液压支承,使其在工作时不会产生机械摩擦,且结构简单,大大改善了性能、使用寿命、工作时产生的振动及噪音。
本实施例的微型泵包括壳体1、转子***2和定子***3。
其中,壳体1具有互不连通的定子腔122和转子腔,定子***3设置在定子腔122中,转子***2设置在转子腔中,转子***2相对于定子***3转动,在该转子腔中填充有工作液体。
具体地,本实施例的微型泵中,壳体1被设计成可拆分的两个部件,包括蜗壳11和底座12,蜗壳11和底座12通过固定组件5连接固定在一起。将壳体1设计成可拆分的两个部件,以便于用户对壳体1内部进行维护、清洗和装卸。该蜗壳11具有蜗壳腔111,底座12具有底座腔121和定子腔122,蜗壳腔111与底座腔121连通形成转子腔,为转子***2和工作液体提供空间,底座腔121环绕包围定子腔122,定子腔122是位于底座腔121的内侧且与底座腔121隔开的环形结构。在底座腔121上还设置有进口管125和出口管126,该进口管125和出口管126用于为工作液体进出微型泵提供通道。蜗壳11面朝底座12的表面还设有与蜗壳腔111不连通的密封槽112,密封槽112中设有密封件113。由于转子***2在蜗壳腔111和底座腔121共同形成的转子腔中高速转动,会带动工作液体作离心运动,设置密封槽112和密封件113可以有效防止工作液体因离心运动甩出转子腔而泄露。
如图3-图6所示,转子***2具有转子部件21和轴承部件22,轴承部件22安装于转子腔中并固定于底座腔121的底部,且位于定子腔122的内侧的圆心位置,转子 部件21安装在轴承部件22上并随着轴承部件22转动。具体地,轴承部件22具有轴承221和轴心222,轴心222固定于转子腔的底部,轴承221套设在轴心222上,轴承221与轴心222之间具有间隙,该轴承221和轴心222均采用陶瓷材质;轴承221的底面面朝转子腔的底部,底面上设置有自底面的外周向底面的内周延伸的多个凹槽2211,多个凹槽2211环绕轴心222排布,凹槽2211的槽口与底面的外周连接并与转子腔连通,凹槽2211的槽底与底面的内周之间具有间隔2212。在轴承221的底面设置多个凹槽2211,该多个凹槽2211不贯穿底面的内周且形成螺旋状,该多个形成螺旋转的凹槽2211沿轴承221的底面的周向方向等间距排布,关于轴心222呈旋转对称。当微型泵工作时,轴承221跟随转子***2一同转动,工作液体从凹槽2211的槽口进入,沿凹槽2211的延伸方向进入凹槽2211的槽底,受凹槽2211的内壁阻挡滞止而产生较高的液体动压,从而在凹槽2211的槽口处产生低压区,在凹槽2211的槽底处产生高压区,使得工作液体对轴承221有一个自轴心222向外的液压推力,以在轴承221和轴心222之间的间隙处形成更加稳定的液膜,从而使得轴承221在径向方向上可以悬浮于工作液体中,轴承221和轴心222之间无机械摩擦。该轴心222具有转轴2221和垫片2222,转轴2221与垫片2222一体成型,转轴2221、垫片2222与底座12一体成型,以保证轴心222和底座12的装配精度。
本实施例的微型泵,利用轴承221的底面上形成螺旋状的多个凹槽2211以及轴承221与轴心222之间的间隙,当轴承部件22工作时,转子腔中的工作液体流入间隙和凹槽2211,在间隙中形成稳定的液膜,在凹槽2211的槽口和槽底形成液体动压差,使得在轴向方向上,轴承221因液膜的浮力能够悬浮于转子腔的工作液体中,进而转子***2也能够悬浮于转子腔的工作液体中,使得微型泵的轴承部件22在工作时无磨损、无噪音。
在本实施例的微型泵中,凹槽2211的槽口的中心线和凹槽2211的槽底的中心线均穿过轴心222的中心且互成角度。具体来说,轴承221的底面是一个具有内周和外周的圆环形状,自轴心222向外延伸出多个径向线,布置在轴承221的底面的多个凹槽2211中,每个凹槽2211的槽口的中心线与凹槽2211的槽底的中心线分别与不同的径向线位于同一直线上,即互成角度。当轴承221在转动时,转子腔中的工作液体更容易、更流畅地流入凹槽2211中,在工作液体流动过程中减少了工作液体与凹槽2211内壁之间的碰撞造成的动能损耗。
进一步地,凹槽2211为弧形,且每个凹槽2211的槽口相对于凹槽2211的槽底在轴承221的底面的圆周方向上朝同一个方向弯曲。凹槽2211的弯曲方向与转子***2的转动方向相同时,当转子***2转动时,工作液体涌入凹槽2211,对凹槽2211的内壁和槽底施加动压。凹槽2211的弯曲方向与转子***2的转动方向相反时,当转子***2转动时,工作液体被吸入凹槽2211,同样对凹槽2211的内壁和槽底施加动压。由于凹槽2211的弧形形状,使得工作液体在凹槽2211中的流动更加流畅,在每个凹槽2211中工作液体对凹槽2211的槽底所施加的液体动压方向均指向轴心222,使得间隙处的液膜更加稳定,轴承221与轴心222之间的液膜也更加稳定。
进一步地,凹槽2211的槽口的内径大于凹槽2211的槽底的内径,也就是说,凹槽2211的内弧面的曲率半径小于外弧面的曲率半径。在转子***2转动过程中,工作 液体更容易通过凹槽2211的槽口流入凹槽2211,同时工作液体在凹槽2211的槽底处的流速比凹槽2211的槽口处的流速更快,更容易在凹槽2211的槽口和槽底之间形成较高的液体动压差。
进一步地,凹槽2211的内径自凹槽2211的槽口至凹槽2211的槽底逐渐减小。具体来说,沿着穿过轴心222的中心线的径向方向,越靠近轴承221的底面的内周,凹槽2211的内径就越小,使得工作液体在凹槽2211中的流速从槽口至槽底逐渐加快,工作液体对凹槽2211的液体动压均匀变大,更有利于在凹槽2211的槽口和槽底之间形成稳定的液体动压差,进而在间隙处形成稳定的液膜。
进一步地,轴心222包括转轴2221和垫片2222,转轴2221与垫片2222一体成型,垫片2222固定于转子腔的底部并位于转子腔的底部与轴承221的底面之间,轴承221的底面与垫片2222之间具有间隙,轴承221的内壁和轴心222的外壁之间具有间隙。具体来说,本实施例的微型泵中,轴心222具有两个部件,一个是穿过轴承221的中心固定在转子腔的底部的转轴2221,另一个是套设在转轴2221外与之一体成型且位于轴承221的底面和转子腔的底部之间的垫片2222,在转子***2转动时,在轴承221和垫片2222、轴承221和转轴2221之间的间隙处分别形成液膜,使得轴承221能够完全悬浮于工作液体中,无机械摩擦、无噪音。同时,垫片2222还能从径向方向上加固转轴2221,限制转轴2221在转动过程中在径向方向上产生的振动,同时垫片2222在轴向方向上保护转子腔的底部不受工作液体的侵蚀和磨损,提高微型泵的使用寿命。
进一步地,转子腔的底部中心设有轴承孔124,转轴2221固定于轴承孔124中。具体来说,轴承孔124凹设在转子腔的底部的中心,转轴2221嵌入固定在轴承孔124中,轴承孔124在轴向方向上和径向方向上均对转轴2221进行加固,限制转轴2221在两个方向上的振动和位移。
如图3至图6所示,转子部件21包括叶轮211和永磁体212,叶轮211具有轮面2111和轮毂2112,轮面2111套设于轴承221的外壁,轮毂2112位于轮面2111与转子腔的底部之间,永磁体212安装于轮毂2112靠近轴心222的内圈;定子***3包括电机定子31和定子绕组32,电机定子31和定子绕组32安装在密闭的定子腔122中,电机定子31固定在定子腔122中,定子绕组32环绕电机定子31设置在定子腔122的侧壁,永磁体212环绕包围在定子绕组32的***。底座12上设有控制器槽123,控制器4设置在底座12的控制器槽123内并与定子***3连接,当控制器4接通电源后,定子绕组32中导入电流并与电机定子31共同差生交变磁场,同时定子***3因不接触工作液体能够有效地实现电气绝缘。
通过电机定子31和定子绕组32在产生交变磁场,利用永磁体212和定子***3之间的磁力,永磁体212在交变磁场的作用下带动叶轮211转动,叶轮211旋转对工作液体做功,驱动工作液体流动,使得转子***2在径向方向上能够悬浮在工作液体中,达到无磨损、无噪音的技术效果。
进一步地,永磁体212的轴向位置与定子***3的轴向位置不同。具体来说,在轴向方向上,永磁体212的水平中心面与定子***3的水平中心面不是同一个平面,且相对于转子腔的底部,永磁体212的位置略高于定子***3的位置,从而使得转子 ***2在轴向方向上受到一个指向定子***3的磁力,这样,转子***2在轴向方向上能够悬浮在转子腔中,达到无磨损、无噪音的技术效果。
进一步地,轮毂2112的内圈设有环形槽2113,环形槽2113中固定有马达壳213,马达壳213位于轮毂2112的内圈与永磁体212之间,利用具有硬度的马达壳213来提高叶轮211的轮毂2112的硬度。叶轮211、马达壳213和轴承221一体成型,以保证转子部件21和轴承221的装配精度。
本实施例的微型泵在使用时,控制器4接通电源后,定子绕组32中导入电流,进而产生交变磁场,永磁体212在交变磁场的作用下带动叶轮211转动,工作液体从进口管125流入底座腔121和蜗壳腔111共同形成的转子腔中,旋转的叶轮211对工作液体做功,使工作液体的总压升高并从出口管126流出,使得微型泵产生驱动工作液体流动的能力。轴承221跟随转子***2一同旋转,工作液体从凹槽2211的槽口进入,沿凹槽2211的内壁方向进入凹槽2211的槽底,受凹槽2211的内壁阻挡滞止,产生较高的液体动压。因而在凹槽2211的槽口处产生低压区,在凹槽2211的槽底处产生高压区,因而工作液体对轴承221有一个向外的液压推力;同时,由于永磁体212与定子***3的中心线不在同一位置,因而定子***3对转子***2有一个指向定子***3的磁性吸引力,通过调整两者中心线的轴向距离,就可以调整磁力大小。如图6所示,对转子***2所受浮力、液压、重力进行分析,设计合理的距离,就能使转子***2在磁力和液压的支承下悬浮于液体中,无机械摩擦、无噪音。
可见,在以上各个方面,通过在轴承221上设置螺旋状排布的凹槽2211,并在轴承221的底面与转子腔的底部之间的间隙处设置与轴承221的底面平行的垫片2222,能够在凹槽2211的槽底产生较高的液体动压,使轴承221在轴向方向上与垫片2222之间形成的液膜更加稳定,在径向方向上与轴心222的转轴2221之间的间隙处形成更加稳定的液膜;通过将定子***3的轴向位置和永磁体212的轴向位置设计在不同位置,以及具有液压支承的轴承部件22,使得转子***2在轴向方向和径向方向上都悬浮在工作液体中,无磨损和噪音;通过采用叶轮211与轴承221一体成型、底座12与轴心222一体成型的结构和工艺,能够有效地提高微型泵的装配精度,以保证微型泵的水力性能和较低的振动和噪音。
以上所述,仅为本发明的具体实施方式,但本发明的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本发明揭露的技术范围内,可轻易想到变化或替换,都应涵盖在本发明的保护范围之内。因此,本发明的保护范围应以所述权利要求的保护范围为准。
Claims (14)
- 一种微型泵,包括壳体、转子***和定子***,其特征在于,所述壳体具有互不连通的定子腔和转子腔,所述定子***设置在所述定子腔中,所述转子***设置在所述转子腔中,所述转子***相对于所述定子***转动;所述转子***具有转子部件和轴承部件,所述轴承部件安装于所述转子腔中,所述转子部件安装在所述轴承部件上并随着所述轴承部件转动;所述轴承部件具有轴承和轴心,所述轴心固定于所述转子腔的底部,所述轴承套设在所述轴心上,所述轴承与所述轴心之间具有间隙;所述轴承的底面面朝所述转子腔的底部,所述底面上设置有自所述底面的外周向所述底面的内周延伸的多个凹槽,多个所述凹槽环绕所述轴心排布,所述凹槽的槽口与所述底面的外周连接并与所述转子腔连通,所述凹槽的槽底与所述底面的内周之间具有间隔。
- 如权利要求1所述的微型泵,其特征在于,所述凹槽的槽口的中心线和所述凹槽的槽底的中心线均穿过所述轴心的中心且互成角度。
- 如权利要求2所述的微型泵,其特征在于,所述凹槽为弧形,且每个所述凹槽的槽口相对于所述凹槽的槽底在所述轴承的底面的圆周方向上朝同一个方向弯曲。
- 如权利要求1-3任一项所述的微型泵,其特征在于,所述凹槽的槽口的内径大于所述凹槽的槽底的内径。
- 如权利要求4所述的微型泵,其特征在于,所述凹槽的内径自所述凹槽的槽口至所述凹槽的槽底逐渐减小。
- 如权利要求1所述的微型泵,其特征在于,所述轴心具有转轴和垫片,所述转轴与所述垫片一体成型,所述垫片固定于所述转子腔的底部并位于所述转子腔的底部与所述轴承的底面之间,所述轴承的底面与所述垫片之间具有间隙,所述轴承的内壁和所述轴心的外壁之间具有间隙。
- 如权利要求6所述的微型泵,其特征在于,所述转子腔的底部中心设有轴承孔,所述转轴固定于所述轴承孔中。
- 如权利要求1所述的微型泵,其特征在于,所述转子部件包括叶轮和永磁体,所述叶轮具有轮面和轮毂,所述轮面套设于所述轴承的外壁,所述轮毂位于所述轮面与所述转子腔的底部之间,所述永磁体安装于所述轮毂靠近所述轴心的内圈;所述定子***包括电机定子和定子绕组,所述电机定子固定在所述定子腔中,所述定子绕组环绕所述电机定子设置在所述定子腔的侧壁;所述永磁体环绕包围在所述定子绕组的***。
- 如权利要求8所述的微型泵,其特征在于,所述永磁体的轴向位置与所述定子***的轴向位置不同。
- 如权利要求8所述的微型泵,其特征在于,所述轮毂的内圈设有环形槽,所述环形槽中固定有马达壳,所述马达壳位于所述轮毂的内圈与所述永磁体之间。
- 如权利要求8所述的微型泵,其特征在于,所述叶轮、所述马达壳和所述轴承一体成型。
- 如权利要求1所述的微型泵,其特征在于,壳体包括蜗壳和底座,所述蜗壳和所述底座通过固定组件连接固定在一起;所述蜗壳具有蜗壳腔,所述底座具有底座腔和所述定子腔,所述蜗壳腔与所述底座腔连通形成所述转子腔,所述轴承部件固定于所述底座腔的底部,所述底座腔环绕包围所述定子腔。
- 如权利要求12所述的微型泵,其特征在于,所述蜗壳面朝所述底座的表面还设有与所述蜗壳腔不连通的密封槽,所述密封槽中设有密封件。
- 如权利要求12所述的微型泵,其特征在于,所述轴心具有转轴和垫片,所述转轴与所述垫片一体成型,所述转轴、所述垫片与所述底座一体成型。
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