CN113309682A - High-reliability miniature lightweight linear compressor - Google Patents

High-reliability miniature lightweight linear compressor Download PDF

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Publication number
CN113309682A
CN113309682A CN202110469758.XA CN202110469758A CN113309682A CN 113309682 A CN113309682 A CN 113309682A CN 202110469758 A CN202110469758 A CN 202110469758A CN 113309682 A CN113309682 A CN 113309682A
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China
Prior art keywords
piston
inner yoke
base
framework
rotor
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CN202110469758.XA
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Chinese (zh)
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CN113309682B (en
Inventor
黄立
曾勇
苏俊霏
王赟
潘奇
黄太和
王立保
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Wuhan Gaoxin Technology Co Ltd
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Wuhan Gaoxin Technology Co Ltd
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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
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
    • 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
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • 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
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/0005—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons
    • 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
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
    • 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
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
    • F04B39/122—Cylinder block
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
    • H02K41/02—Linear motors; Sectional motors
    • H02K41/03—Synchronous motors; Motors moving step by step; Reluctance motors
    • H02K41/031—Synchronous motors; Motors moving step by step; Reluctance motors of the permanent magnet type

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)

Abstract

The invention relates to a high-reliability miniature light linear compressor, which comprises a base, a stator component and a rotor component, wherein the base is provided with a compression cavity and a working medium flow passage, one end of the working medium flow passage is communicated with the compression cavity, the other end of the working medium flow passage penetrates through the base, an inner yoke is fixed on one side or the left side and the right side of the base, the inner yoke is provided with an axial through hole, the axial through hole of the inner yoke is communicated with the compression cavity, a piston is in sliding fit with the axial through hole of the inner yoke, the piston is in clearance seal fit with the axial through hole of the inner yoke, the piston is connected with the rotor component, and when the stator component is connected with a power supply, the rotor component drives the piston to move axially to compress a working medium in the compression cavity. The compressor can reduce the radial size of the compressor, reduce the weight of the compressor and realize the light weight design of the compressor; the compressor adjusts the pressure of the back pressure cavity and the compression cavity through gas circuit optimization, maintains the dynamic balance position and the initial balance position of the piston to be consistent, and enables the compressor to operate stably and reliably.

Description

High-reliability miniature lightweight linear compressor
Technical Field
The invention relates to a linear compressor, in particular to a high-reliability miniature light linear compressor.
Background
The linear Stirling refrigerator is widely applied to civil and military equipment such as thermal infrared imagers, infrared foresight and night vision, missile guidance, space application and the like, and the linear compressor is used as a core component of the Stirling refrigerator and is a power source for maintaining the normal flow of working media. At present, with the increasingly complex system and the more compact internal space, the requirements on the size and the weight of the refrigerator are increasingly strict, so that the miniature and light-weight design of the linear compressor becomes the key point and the difficulty of the technical development of the Stirling refrigerator.
After the linear compressor is assembled, the piston is in an initial balance position; when the linear motor is driven by sine AC voltage, the piston has a dynamic balance position because the pressure of the back pressure cavity and the average pressure of the compression cavity are changed. When the dynamic balance position of the compressor deviates from the initial balance position, the maximum stroke of the compressor is reduced, the refrigeration performance of the refrigerator is influenced, and in the process, the plate spring is always in a stretching state, so that the service life of the plate spring is shortened, and the reliability of the refrigerator is reduced.
And the piston of the compressor runs in the cylinder, the inner yoke is fixed outside the cylinder, the thickness of the cylinder between the piston and the inner yoke cannot be avoided, and the radial size of the compressor is indirectly increased.
At present, piston abrasion becomes one of the main reasons of compressor failure, and the phenomena of seizure, current fluctuation and the like caused by the piston abrasion limit the service life of the Stirling refrigerator.
Disclosure of Invention
The invention aims to provide a high-reliability miniature light linear compressor, which can solve at least part of technical problems, such as the radial size reduction of the compressor, the weight reduction of the compressor and the realization of the light design of the compressor; meanwhile, the compressor adjusts the pressure of the back pressure cavity and the compression cavity through gas circuit optimization, and maintains the dynamic balance position and the initial balance position of the piston to be consistent, so that the compressor can operate stably and reliably.
The technical scheme of the invention is realized as follows: the invention discloses a high-reliability miniature light linear compressor, which comprises a base, a stator component and a rotor component, wherein the base is provided with a compression cavity and a first working medium flow channel, one end of the first working medium flow channel is communicated with the compression cavity, the other end of the first working medium flow channel penetrates through the base, and an inner yoke is fixed on one side or the left side and the right side of the base; the inner yoke is provided with an axial through hole which is used for being in sliding fit with the piston, the axial through hole of the inner yoke is communicated with the compression cavity of the base, the piston is in sliding fit in the axial through hole of the inner yoke, the piston is in clearance sealing fit with the axial through hole of the inner yoke, the piston is connected with the rotor assembly, and when the stator assembly is connected with a power supply, the rotor assembly drives the piston to move axially to compress working media in the compression cavity.
Further, the high-reliability miniature light-weight linear compressor also comprises a machine shell fixed on one side or the left side and the right side of the base, a back pressure cavity is formed between the machine shell and the inner yoke as well as between the machine shell and the base, the stator assembly is fixed in the machine shell, the rotor assembly is positioned in an inner cavity of the stator assembly, a gap is reserved between the outer wall of the rotor assembly and the inner wall of the stator assembly, a gap is arranged between the inner wall of the rotor assembly and the outer wall of the inner yoke, the tail end of the piston is positioned in the back pressure cavity, the head end of the piston extends into the inner yoke and is in sliding fit and gap seal with the inner wall of the inner yoke, a second working medium flow channel is arranged on the end face of the head end of the piston, one end of the second working medium flow channel is communicated with the compression cavity of the base, the other end of the second working medium flow channel is communicated with a radial through hole arranged on the inner yoke to form an air passage for communicating the compression cavity with the back pressure cavity, when the piston is in a balance position, a second working medium flow channel on the piston is communicated with the radial through hole on the inner yoke, and at the moment, the working mediums mutually circulate between the back pressure cavity and the compression cavity.
Further, the stator assembly comprises a stator framework, the stator framework is of a cylindrical structure, and a coil is wound on the outer wall of the stator framework; the coil is wrapped with external soft magnet; the end faces of one side or the left side and the right side of the base are provided with annular grooves, and a spigot at one end of the stator framework is positioned in the annular grooves of the base and is fixedly connected with the annular grooves; the other end of the stator framework is fixedly connected with an end cover of the shell, and the end cover, the stator framework, the inner yoke and the base form a back pressure cavity.
Further, the active cell subassembly includes active cell skeleton and permanent magnet, the permanent magnet is fixed on the active cell skeleton, the active cell subassembly is located stator module, the active cell skeleton is connected with the piston, the permanent magnet of active cell subassembly, active cell skeleton are located the backpressure intracavity, and the piston head end is located the axial through hole of interior yoke, and the tail end of piston is located the backpressure intracavity.
Furthermore, the rotor framework is of a cylindrical structure, the rotor framework is provided with a large-aperture section and a small-aperture section, the rotor framework is sleeved on the piston, the small-aperture section of the rotor framework is connected with the piston, the inner yoke is located in the large-aperture section of the rotor framework, and a gap is formed between the outer wall of the inner yoke and the inner wall of the large-aperture section of the rotor framework; the permanent magnet is fixed on the outer wall of the large-aperture section of the rotor framework, and a gap is formed between the outer wall of the permanent magnet and the inner wall of the stator framework of the stator assembly.
Further, the piston is connected with a stator framework of the stator assembly through a plate spring; the plate spring is sleeved on the piston and connected with the piston, a fixing hole is formed in the outer ring of the plate spring, and the outer ring of the plate spring is fixedly connected with the stator framework of the stator assembly.
Furthermore, the inner ring of the plate spring is connected and fixed with the piston on the rotor framework, and the outer ring of the plate spring is fixed on the stator framework through screws.
Furthermore, the outer wall of the inner yoke is provided with a plurality of axial grooves extending along the axial direction, one ends of the grooves penetrate through the end face of the inner yoke, the other ends of the grooves do not penetrate through the end face of the inner yoke, and the plurality of axial grooves are distributed at intervals around the inner yoke; the bottom of the groove is provided with a radial through hole which communicates the groove with the inner cavity of the inner yoke.
Furthermore, when a compression cavity of the base axially penetrates through the end faces of the left side and the right side of the base, the inner yoke, the stator assembly and the rotor assembly are fixed on the left side and the right side of the base, and openings on the left side and the right side of the compression cavity are respectively sealed through pistons matched in the inner yoke; the left side and the right side of the base are symmetrically arranged;
when a compression cavity of the base only penetrates through the end face of one side of the base along the axial direction, the inner yoke, the stator assembly and the rotor assembly are fixed on one side of the base, and an opening of the compression cavity is sealed through a piston matched with the inner yoke.
Further, the stator assembly is fixedly connected with the base or/and the machine shell; the casing comprises a cylindrical shell and an end cover, one end of the cylindrical shell is fixedly connected with one side end face of the base, and the other end of the cylindrical shell is fixedly connected with the end cover to seal the cylindrical shell.
Furthermore, the outer wall of the shaft section of the piston, which is used for being matched with the inner yoke, is arranged in a stepped shape, so that the outer wall of the large-diameter shaft section of the piston is in sliding fit with the inner yoke and is in clearance seal, the outer diameter of the small-diameter shaft section of the piston is smaller than that of the large-diameter shaft section of the piston, and the outer diameter of the small-diameter shaft section of the piston is smaller than that of the inner yoke; the small-diameter shaft section of the piston is positioned at the head end of the piston; or/and the axial through hole of the inner yoke is set to be a stepped hole, and the inner wall of the small-bore section of the inner yoke is in sliding fit with the outer wall of the piston and is in clearance seal.
The invention has at least the following beneficial effects:
the invention provides a miniature light linear inner yoke and a cylinder which are integrally designed, the space occupied by the wall thickness of the cylinder is fully utilized, the radial size of a compressor can be reduced, the weight of the compressor is reduced, and the light design of the compressor is realized; meanwhile, the compressor adjusts the pressure of the back pressure cavity and the compression cavity through gas circuit optimization, and maintains the dynamic balance position and the initial balance position of the piston to be consistent, so that the compressor can stably and reliably operate; in addition, the piston or the inner yoke is kept away from the key position, so that the abrasion of the piston is reduced, and the reliability and the service life of the refrigerator are improved.
The outer ring of the plate spring is fixed on the stator framework, and the inner ring of the plate spring is connected with the piston and the rotor framework, so that the radial support of the piston and the rotor assembly can be realized, the gap between the piston and the inner hole of the inner yoke is kept, and the abrasion risk of the piston is reduced.
The inner yoke and the outer yoke are both provided with axial grooves, so that the eddy current loss can be reduced when the compressor operates normally, and the efficiency of the linear motor is improved. In addition, the axial grooves are arranged, so that the weights of the inner yoke and the outer yoke can be reduced, and finally the lightweight design of the compressor is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a high-reliability miniature lightweight linear compressor according to an embodiment of the present invention;
FIG. 2 is a schematic view of an assembly of an inner yoke, a piston and a base of a linear compressor according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an embodiment of a piston of a linear compressor according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another embodiment of a piston of a linear compressor according to an embodiment of the present invention;
fig. 5 is a schematic structural view of an inner yoke of a linear compressor according to an embodiment of the present invention;
fig. 6 is a sectional view of an inner yoke of a linear compressor according to an embodiment of the present invention.
In the drawing, 1 is an end cover, 2 is a stator frame, 3 is a rotor frame, 4 is an inner yoke, 41 is an axial through hole, 42 is a radial through hole, 43 is an axial groove, 5 is magnetic steel, 6 is a coil, 7 is an outer yoke, 8 is a base, 81 is a compression cavity, 82 is a first working medium flow passage, 83 is an annular groove, 84 is a wire passing hole, 9 is a shell, 10 is a piston, 101 is a second working medium flow passage, 11 is a first plate spring, 12 is a second plate spring, 13 is a spacer ring, and 14 is a back pressure cavity.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, the meaning of "plurality" or "a number" is two or more unless otherwise specified.
Referring to fig. 1 to 6, the embodiment of the invention discloses a high-reliability miniature lightweight linear compressor, which comprises a base 8, a stator assembly and a rotor assembly, wherein the base 8 is provided with a compression cavity 81 and a first working medium flow channel 82, one end of the first working medium flow channel 82 is communicated with the compression cavity 81, the other end of the first working medium flow channel 82 penetrates through the base 8, an inner yoke 4 is fixed on one side or the left side and the right side of the base 8, the inner yoke 4 is provided with an axial through hole 41 used for being in sliding fit with a piston 10, the axial through hole 41 of the inner yoke 4 is communicated with the compression cavity 81 of the base 8, the piston 10 is in sliding fit with the axial through hole 41 of the inner yoke 4, the piston is in clearance sealing fit with the axial through hole of the inner yoke, the piston 10 is connected with the rotor assembly, when the stator assembly is connected with a power supply, the rotor assembly drives, compressing the working medium in the compression chamber 81.
Further, the high-reliability miniature light-weight linear compressor further comprises a casing fixed on one side or the left side and the right side of the base 8, a back pressure cavity 14 is formed between the casing and the inner yoke 4 and the base 8, the stator assembly is fixed in the casing, the rotor assembly is located in an inner cavity of the stator assembly, a gap is reserved between the outer wall of the rotor assembly and the inner wall of the stator assembly, a gap is arranged between the inner wall of the rotor assembly and the outer wall of the inner yoke 4, the tail end of the piston 10 is located in the back pressure cavity 14, the head end of the piston 10 extends into the inner yoke 4 and is in sliding fit and gap seal with the inner wall of the inner yoke 4, a second working medium flow channel 101 is arranged on the end face of the head end of the piston 10, one end of the second working medium flow channel 101 is communicated with a compression cavity 81 of the base 8, and the other end of the second working medium flow channel 101 is used for being communicated with a radial through hole 42 arranged on the inner yoke 4, and an air passage for communicating the compression cavity 81 and the back pressure cavity 14 is formed, when the piston 10 is at the balance position, the second working medium flow passage 101 on the piston 10 is communicated with the radial through hole 42 on the inner yoke 4, and at the moment, the working mediums mutually circulate between the back pressure cavity 14 and the compression cavity 81.
Preferably, second working fluid channel 101 is multi-channel.
Further, the stator assembly comprises a stator framework 2, the stator framework 2 is of a cylindrical structure, and a coil 6 is wound on the outer wall of the stator framework 2; the coil 6 is wrapped with external soft magnet; an annular groove 83 is formed in one side or the left and right side end faces of the base 8, and a spigot at one end of the stator framework 2 is positioned in the annular groove 83 of the base 8 and is fixedly connected with the same; the other end of the stator framework 2 is fixedly connected with the end cover 1. The end cover, the stator framework, the inner yoke and the base form a back pressure cavity.
The stator frame 2 of the stator assembly of the present embodiment is welded to the base 8. And a stator framework 2 of the stator assembly is welded with the end cover 1. The stator framework 2 is of a stepped cylindrical structure. The inner cavity of the stator framework 2 is also stepped, the stator framework 2 is provided with a large aperture section, a middle aperture section and a small aperture section, and the coil 6 is arranged on the outer wall of the small aperture section of the stator framework 2.
Further, the rotor assembly comprises a rotor framework 3 and a permanent magnet (magnetic steel), the permanent magnet (magnetic steel) is fixed on the rotor framework 3, the rotor assembly is located in the stator assembly, and the rotor framework 3 is connected with the piston 10. The permanent magnet (magnetic steel) and the rotor framework of the rotor assembly are positioned in the backpressure cavity, the head end of the piston is positioned in the axial through hole of the inner yoke, and the tail end of the piston is positioned in the backpressure cavity.
Further, the rotor framework 3 is of a cylindrical structure, the rotor framework 3 is provided with a large-aperture section and a small-aperture section, the rotor framework 3 is sleeved on the piston 10, the small-aperture section of the rotor framework 3 is connected with the piston 10, the inner yoke 4 is located in the large-aperture section of the rotor framework 3, and a gap is formed between the outer wall of the inner yoke 4 and the inner wall of the large-aperture section of the rotor framework 3; the permanent magnet is fixed on the outer wall of the large-aperture section of the rotor framework 3, and a gap is formed between the outer wall of the permanent magnet and the inner wall of the stator framework 2 of the stator assembly.
The mover framework 3 and the piston 10 are axially positioned.
Further, the piston 10 is connected with the stator framework 2 of the stator assembly through a plate spring; the plate spring is sleeved on the piston 10 and connected with the piston 10, a fixing hole is formed in the outer ring of the plate spring, and the outer ring of the plate spring is fixedly connected with the stator framework 2 of the stator assembly.
The outer ring of the plate spring is fixed on the stator framework through the screw, and the inner ring of the plate spring is connected with the piston and the rotor framework, so that the radial support of the piston and the rotor assembly can be realized, the gap between the piston and the inner hole of the inner yoke is kept, and the abrasion risk of the piston is reduced.
Two plate springs are sleeved on the piston 10, and the first plate spring 11 and the second plate spring 12 are separated by a space ring 13. Axially between the leaf spring and the piston 10. The leaf springs are all provided with air flow through holes or slots. The invention adopts a group of plate springs to support the rotor assembly, and reduces the risk of piston abrasion through the clearance of the end part of the piston while not increasing the axial size of the compressor.
Furthermore, the outer wall of the inner yoke 4 is provided with a plurality of axial grooves 43 extending along the axial direction, one end of each groove penetrates through the end face of the inner yoke 4, the other end of each groove does not penetrate through the end face of the inner yoke 4, and the plurality of axial grooves 43 are distributed at intervals around the inner yoke 4; the bottom of the groove is provided with a radial through hole 42 which communicates the groove with the inner cavity of the inner yoke 4. The inner yoke and the outer yoke are both provided with axial grooves, so that the eddy current loss can be reduced when the compressor operates normally, and the efficiency of the linear motor is improved. In addition, the axial grooves are arranged, so that the weights of the inner yoke and the outer yoke can be reduced, and finally the lightweight design of the compressor is realized.
The inner yoke 4 is welded and fixed on the end surface of the base 8.
Further, when the compression cavity 81 of the base 8 axially penetrates through the end surfaces of the left side and the right side of the base 8, the inner yoke 4, the stator assembly and the rotor assembly are fixed on the left side and the right side of the base 8, and openings on the left side and the right side of the compression cavity 81 are respectively sealed by the piston 10 matched in the inner yoke 4; the left side and the right side of the base 8 are symmetrically arranged;
when the compression chamber 81 of the base 8 axially penetrates only the end surface of one side of the base 8, the inner yoke 4, the stator assembly and the mover assembly are fixed on one side of the base 8, and the opening of the compression chamber 81 is sealed by the piston 10 fitted in the inner yoke 4.
The base 8 is plate-shaped, the compression cavity 81 of the base 8 in this embodiment axially penetrates through the end faces of the left and right sides of the base 8, a through hole is formed in the center of the base 8 to form the compression cavity 81, the first working medium flow channel 82 is radially arranged along the base 8, and the first working medium flow channel 82 penetrates through the side wall of the plate-shaped base 8 and is used for allowing a working medium to enter and exit the compression cavity.
The base 8 is provided with a wire passing hole 84 penetrating through end faces of left and right ends of the base 8, and the wire passing hole 84 is located outside the annular groove 83.
Further, the stator assembly is fixedly connected with the base 8 or/and the machine shell; the machine shell comprises a cylindrical shell 9 and an end cover 1, one end of the cylindrical shell 9 is fixedly connected with one side end face of the base 8, and the other end of the cylindrical shell 9 is fixedly connected with the end cover 1 to seal the cylindrical shell 9. The cylindrical housing 9 and the end cap 1 may be separate components, or the cylindrical housing 9 and the end cap 1 may be integrally formed as a single housing.
The cylindrical shell 9 is fixedly connected with the spigot of the base 8 after being positioned. The cylindrical housing 9 of the present embodiment is welded to the base 8.
Further, the outer wall of the shaft section of the piston 10, which is used for being matched with the inner yoke 4, is arranged in a stepped shape, so that the outer wall of the large-diameter shaft section of the piston 10 is in sliding fit with the inner yoke 4 and is in clearance seal, the outer diameter of the small-diameter shaft section of the piston 10 is smaller than that of the large-diameter shaft section of the piston 10, and the outer diameter of the small-diameter shaft section of the piston 10 is smaller than that of the inner yoke 4; the small-diameter shaft section of the piston 10 is positioned at the head end of the piston 10; or/and the axial through hole 41 of the inner yoke 4 is set to be a stepped hole, and the inner wall of the small-bore section of the inner yoke 4 is in sliding fit with the outer wall of the piston 10 and is in clearance seal.
The inner yoke 4 of the present embodiment is fixed to the base 8 by means of laser welding. The rotor assembly is fixed on the stator framework 2 through outer ring screws of the plate springs, the stator assembly is fixed on the base 8 after the processes are completed, the shell 9 is installed, welding of the end cover 1 is completed through laser welding, and then the compressor can be assembled.
The end cover, the stator framework, the inner yoke and the base form a back pressure cavity, and parts such as the magnetic steel, the rotor framework and the plate spring are located in the back pressure cavity. The rotor assembly is connected with the stator framework through a plate spring to realize radial support. A gap is arranged between the magnetic steel of the rotor assembly and the inner wall of the stator framework, and a gap is arranged between the rotor framework of the rotor assembly and the outer wall of the inner yoke. The piston is fixed on the magnetic steel framework through the inner ring of the plate spring and extends into the inner bore of the inner magnet yoke, and the piston reciprocates in the inner bore of the inner magnet yoke and can realize clearance sealing.
During the operation of the compressor, the working medium is compressed and expanded in the compression chamber 81. When the piston 10 reaches the equilibrium position, the working medium can flow between the back pressure chamber 14 and the compression chamber 81 through the piston 10 and the wide grooves of the inner yoke 4, so that the balance of the average pressures of the back pressure chamber 14 and the compression chamber 81 is maintained, and the dynamic equilibrium position of the piston 10 is ensured not to be deviated.
By reducing the diameter of the tail end of the piston 10 or properly increasing the diameter of the inner hole of the inner yoke 4, the abrasion of the piston 10 can be reduced on the premise of realizing the clearance sealing, and the service life of the compressor is prolonged.
The high-reliability miniature lightweight linear compressor reduces the axial size of the compressor by subtracting the cylinder between the inner yoke 4 and the piston 10, thereby realizing the lightweight of the compressor; through gas circuit optimization, the pressure of the back pressure cavity 14 and the pressure of the compression cavity 81 are adjusted to maintain the balance position of the piston 10 unchanged, so that the reliability of the compressor is improved; the abrasion of the piston 10 is reduced through the structure clearance, and the service life of the compressor is prolonged.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. The utility model provides a miniature lightweight linear compressor of high reliability which characterized in that: the magnetic coupling comprises a base, a stator assembly and a rotor assembly, wherein the base is provided with a compression cavity and a first working medium flow channel, one end of the first working medium flow channel is communicated with the compression cavity, the other end of the first working medium flow channel penetrates through the base, and an inner yoke is fixed on one side or the left side and the right side of the base; the inner yoke is provided with an axial through hole which is used for being in sliding fit with the piston, the axial through hole of the inner yoke is communicated with the compression cavity of the base, the piston is in sliding fit in the axial through hole of the inner yoke, the piston is in clearance sealing fit with the axial through hole of the inner yoke, the piston is connected with the rotor assembly, and when the stator assembly is connected with a power supply, the rotor assembly drives the piston to move axially to compress working media in the compression cavity.
2. The highly reliable, miniature, lightweight linear compressor according to claim 1, wherein: the back pressure piston comprises a stator assembly, an inner yoke and a base, and is characterized by further comprising a machine shell fixed on one side or the left and right sides of the base, a back pressure cavity is formed between the machine shell and the inner yoke as well as between the machine shell and the base, the stator assembly is fixed in the machine shell, the rotor assembly is located in an inner cavity of the stator assembly, a gap is reserved between the outer wall of the rotor assembly and the inner wall of the stator assembly, a gap is arranged between the inner wall of the rotor assembly and the outer wall of the inner yoke, the tail end of the piston is located in the back pressure cavity, the head end of the piston extends into the inner yoke and is in sliding fit and gap seal with the inner wall of the inner yoke, a second working medium flow channel is arranged on the end face of the piston, one end of the second working medium flow channel is communicated with a compression cavity of the base, the other end of the second working medium flow channel is communicated with a radial through hole arranged on the inner yoke to form a gas path for communicating the compression cavity with the back pressure cavity, and when the piston is in a balance position, the second working medium flow channel on the piston is communicated with the radial through hole on the inner yoke, at the moment, the working media flow between the back pressure cavity and the compression cavity.
3. The highly reliable, miniature, lightweight linear compressor according to claim 1 or 2, wherein: the stator assembly comprises a stator framework, the stator framework is of a cylindrical structure, and a coil is wound on the outer wall of the stator framework; the coil is wrapped with external soft magnet; the end faces of one side or the left side and the right side of the base are provided with annular grooves, and a spigot at one end of the stator framework is positioned in the annular grooves of the base and is fixedly connected with the annular grooves; the other end of the stator framework is fixedly connected with an end cover of the shell, and the end cover, the stator framework, the inner yoke and the base form a back pressure cavity.
4. The highly reliable, miniature, lightweight linear compressor according to claim 1 or 2, wherein: the rotor component comprises a rotor framework and a permanent magnet, the permanent magnet is fixed on the rotor framework, the rotor component is located in the stator component, the rotor framework is connected with a piston, the permanent magnet and the rotor framework of the rotor component are located in a back pressure cavity, the head end of the piston is located in an axial through hole of the inner yoke, and the tail end of the piston is located in the back pressure cavity.
5. The highly reliable, miniature, lightweight linear compressor according to claim 4, wherein: the rotor framework is of a cylindrical structure and is provided with a large-aperture section and a small-aperture section, the rotor framework is sleeved on the piston, the small-aperture section of the rotor framework is connected with the piston, the inner yoke is located in the large-aperture section of the rotor framework, and a gap is formed between the outer wall of the inner yoke and the inner wall of the large-aperture section of the rotor framework; the permanent magnet is fixed on the outer wall of the large-aperture section of the rotor framework, and a gap is formed between the outer wall of the permanent magnet and the inner wall of the stator framework of the stator assembly.
6. The highly reliable, miniature, lightweight linear compressor according to claim 1, wherein: the piston is connected with a stator framework of the stator assembly through a plate spring; the plate spring is sleeved on the piston and connected with the piston, a fixing hole is formed in the outer ring of the plate spring, and the outer ring of the plate spring is fixedly connected with the stator framework of the stator assembly.
7. The highly reliable, miniature, lightweight linear compressor according to claim 1, wherein: the outer wall of the inner yoke is provided with a plurality of axial grooves extending along the axial direction, one ends of the grooves penetrate through the end face of the inner yoke, the other ends of the grooves do not penetrate through the end face of the inner yoke, and the plurality of axial grooves are distributed at intervals around the magnetic yoke; the bottom of the groove is provided with a radial through hole which communicates the groove with the inner cavity of the inner yoke.
8. The highly reliable, miniature, lightweight linear compressor according to claim 1, wherein: when a compression cavity of the base axially penetrates through the end faces of the left side and the right side of the base, an inner yoke, a stator assembly and a rotor assembly are fixed on the left side and the right side of the base, and openings on the left side and the right side of the compression cavity are respectively sealed through pistons matched in the inner yoke; the left side and the right side of the base are symmetrically arranged;
when a compression cavity of the base only penetrates through the end face of one side of the base along the axial direction, the inner yoke, the stator assembly and the rotor assembly are fixed on one side of the base, and an opening of the compression cavity is sealed through a piston matched with the inner yoke.
9. The highly reliable, miniature, lightweight linear compressor according to claim 1, wherein: the stator assembly is fixedly connected with the base or/and the machine shell; the casing comprises a cylindrical shell and an end cover, one end of the cylindrical shell is fixedly connected with one side end face of the base, and the other end of the cylindrical shell is fixedly connected with the end cover to seal the cylindrical shell.
10. The highly reliable, miniature, lightweight linear compressor according to claim 1, wherein: the outer wall of the shaft section of the piston, which is used for being matched with the inner yoke, is arranged into a step shape, so that the outer wall of the large-diameter shaft section of the piston is in sliding fit with the inner yoke and is in clearance seal; the small-diameter shaft section of the piston is positioned at the head end of the piston; or/and the axial through hole of the inner yoke is set to be a stepped hole, and the inner wall of the small-bore section of the inner yoke is in sliding fit with the outer wall of the piston and is in clearance seal.
CN202110469758.XA 2021-04-28 2021-04-28 High-reliability miniature lightweight linear compressor Active CN113309682B (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2448647A1 (en) * 1979-02-08 1980-09-05 Man Design Co ELECTROMAGNETIC FLUID PUMP
CN1240883A (en) * 1998-07-03 2000-01-12 三星电子株式会社 Inner core/cylinder block assembly for linear compressor and method for assembling the same
CN103117633A (en) * 2013-03-22 2013-05-22 湖南大学 High-speed permanent magnet synchronous motor and assembly method thereof
CN108612638A (en) * 2018-03-28 2018-10-02 青岛海尔股份有限公司 Linear compressor and refrigeration equipment
CN108757381A (en) * 2018-05-31 2018-11-06 上海朗旦制冷技术有限公司 A kind of double cylinder opposed type oil-free linear compressor
CN208581151U (en) * 2018-08-20 2019-03-05 青岛万宝压缩机有限公司 Linear compressor mover
CN112555123A (en) * 2020-12-10 2021-03-26 武汉高芯科技有限公司 Linear compressor capable of maintaining balance position of piston unchanged

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2448647A1 (en) * 1979-02-08 1980-09-05 Man Design Co ELECTROMAGNETIC FLUID PUMP
CN1240883A (en) * 1998-07-03 2000-01-12 三星电子株式会社 Inner core/cylinder block assembly for linear compressor and method for assembling the same
CN103117633A (en) * 2013-03-22 2013-05-22 湖南大学 High-speed permanent magnet synchronous motor and assembly method thereof
CN108612638A (en) * 2018-03-28 2018-10-02 青岛海尔股份有限公司 Linear compressor and refrigeration equipment
CN108757381A (en) * 2018-05-31 2018-11-06 上海朗旦制冷技术有限公司 A kind of double cylinder opposed type oil-free linear compressor
CN208581151U (en) * 2018-08-20 2019-03-05 青岛万宝压缩机有限公司 Linear compressor mover
CN112555123A (en) * 2020-12-10 2021-03-26 武汉高芯科技有限公司 Linear compressor capable of maintaining balance position of piston unchanged

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