CN110043443B - Moving-magnet linear compressor - Google Patents

Abstract

The invention provides a moving magnet linear compressor, comprising a compressor casing, a stator assembly and a mover assembly. The stator assembly includes an inner yoke located on the central axis of the compressor casing, and is arranged around the inner yoke. The outer yoke, the motor fixing frame that fixes the inner yoke and the outer yoke, the motor fixing frame is elastically supported on the inner wall of the compressor housing through a shock-absorbing support; the permanent magnet bracket A permanent magnet magnet block is embedded on it, and the permanent magnet magnet block can reciprocate through the gap between the inner yoke and the outer yoke, and the reciprocating motion of the permanent magnet magnet block drives the permanent magnet support It moves with the linear motor shaft, and then drives the piston of the cylinder to compress the gas to do work, compressing the low-temperature and low-pressure refrigerant gas into a high-temperature and high-pressure refrigerant gas. By optimizing the structure of a plurality of components, the invention realizes the functions of compact structure, stable connection, high operation efficiency, low noise and long service life of the compressor.

Description

A moving magnet linear compressor

technical field

The present invention relates to the technical field of linear compressors, in particular to a moving magnet linear compressor.

Background technique

The compressor is the heart of the refrigeration system. It is a driven fluid machine that lifts low-pressure gas into high-pressure gas. It inhales low-temperature and low-pressure refrigerant gas from the suction pipe, and drives the piston to compress it through the motor drive. The high-temperature and high-pressure refrigerant gas is discharged to the exhaust pipe to provide power for the refrigeration cycle. At present, most domestic refrigerators, air conditioners and other refrigeration equipment use rotary compressors. This kind of compressor uses a traditional rotary motor as a driving source, and uses a crank connecting rod mechanism to convert the rotary motion of the motor into the linear reciprocating motion of the piston. Although this type of compressor is economical, it has disadvantages such as large frictional resistance, low efficiency, and poor mechanical reliability, and it is difficult to improve its performance.

In contrast, the reciprocating linear compressor driven by a linear motor has received more and more attention. The reciprocating linear compressor can save the crank connecting rod mechanism, reduce friction loss, and improve system efficiency and reliability. According to the different types of linear motors used, there are mainly the following types of linear compressors: moving coil type, moving iron type, moving magnet type and moving magnet type. Compared with other types of compressors, the moving magnet linear compressor is more compact, smaller, more powerful and more efficient.

In order to further improve the performance and operating efficiency of the compressor and have a longer service life, it is necessary to carry out further structural optimization design on the basis of the existing compressor structure to make the structure more compact, reduce the air gap, and increase the specific thrust of the motor. .

SUMMARY OF THE INVENTION

In view of the above technical problems, the purpose of the present invention is to provide a moving magnet linear compressor with a novel structure, which adopts a permanent magnet bracket to support the permanent magnet magnet blocks, reduces the air gap, and greatly reduces the possibility of magnetic leakage It increases the specific thrust of the motor.

In order to achieve the above object, the present invention provides a moving magnet linear compressor, which includes a compressor casing, a stator assembly and a mover assembly located in the compressor casing, and the stator assembly includes a compressor casing located in the center of the compressor casing. The inner yoke on the axis, the outer yoke arranged around the inner yoke, the motor fixing frame that fixes the inner yoke and the outer yoke, the motor fixing frame is elastically supported on the on the inner wall of the compressor housing;

The mover assembly includes a linear motor shaft axially passing through the inner yoke, a permanent magnet bracket located between the inner yoke and the outer yoke and connected with the linear motor shaft, and a permanent magnet bracket located in the linear motor. The plate spring and the resonance cylindrical spring at the end of the shaft, the left end of the linear motor shaft is connected with the piston rod of the cylinder;

A permanent magnet magnet block is embedded on the permanent magnet bracket, and the permanent magnet magnet block can reciprocate through the gap between the inner yoke and the outer yoke, and the reciprocating motion of the permanent magnet magnet block drives the The permanent magnet support and the linear motor shaft move, thereby driving the piston of the cylinder to compress the gas to do work, compressing the low-temperature and low-pressure refrigerant gas into a high-temperature and high-pressure refrigerant gas.

Further, the compressor housing is also provided with a suction and exhaust assembly for reducing the working noise of the compressor;

The suction and exhaust assembly includes a suction valve sheet, an exhaust valve sheet, a cylinder intake plug, and an exhaust muffler, and the suction valve sheet and the exhaust valve sheet are fixed on the end face of the piston by a locking screw superior;

The cylinder intake plug is inserted into the cylinder from the bottom of the cylinder.

Further, the exhaust muffler is divided into two parts, one part is a hemispherical cavity, the other part is a stepped cylindrical cavity with an exhaust pipe, wherein the bottom of the hemispherical cavity is connected to the cylinder. The bottom of the stepped cylindrical cavity is fitted with the outer surface of the hemispherical cavity, and the lower end of the pressing cover is fitted with the upper surface of the cylinder, and the pressing cover is A locking cap is threadedly connected to press the exhaust pipe between the locking cap and the protruding tube of the stepped cylindrical cavity.

Preferably, an inner coil and an outer coil are respectively wound around the cavity on the inner yoke and the outer yoke;

The outer yoke is formed by stacking a plurality of E-shaped silicon steel sheets. Both ends of the outer yoke of the E-shaped structure are provided with arc-shaped flanges, and the wound outer coil can be directly drawn from the outer yoke;

A lead slot is provided at the boss of the inner yoke, and the wound inner coil is drawn out through the lead slot.

Preferably, the right end of the permanent magnet support is attached to the shoulder of the linear motor shaft, the left end of the permanent magnet support is fixedly connected with a permanent magnet support plug, and the center of the permanent magnet support plug is fixedly connected with the linear motor shaft;

A stepped shaft sleeve is sleeved on the outer diameter of the piston rod, and the right end face of the stepped shaft sleeve is fitted with the end face of the linear motor shaft;

The leaf spring includes a left leaf spring and a right leaf spring respectively located at the left end and the right end of the linear motor shaft, and the outer ring of the left leaf spring is fixedly connected with the right end cover and the right motor fixing frame; the left leaf spring The outer ring of the motor is fixedly connected with the left motor fixing frame, the left end cover and the transition support frame.

Further, the central portion of the left leaf spring is fitted with the stepped bushing and the end of the left cylindrical spring seat, and the central portion of the right leaf spring is fitted with the shoulder of the linear motor shaft and the right cylindrical spring seat. the end fit;

The resonant cylindrical spring includes a left resonant cylindrical spring and a right resonant cylindrical spring, two ends of the right resonant cylindrical spring are respectively in fixed contact with the right cylindrical spring seat and the groove in the middle of the right end cover; The ends are respectively in fixed contact with the left cylindrical spring seat and the groove in the middle part of the left end cover;

The right cylindrical spring seat is locked on the linear motor shaft by a nut.

Preferably, the upper end and the lower end of the motor fixing frame are respectively provided with two cylindrical flanges for connecting with the shock absorbing support, and four groups of bosses are arranged on the side ends, and each set of two bosses is parallel to each other. The distance between the two bosses in each group is equal to the cross-sectional width of the outer yoke. After the outer yoke is installed in the groove of the motor fixing frame, the boss is used to fix and clamp its position.

Optionally, the permanent magnet support is in the shape of a cylindrical fence, and has a mounting slot in the middle position for installing the permanent magnet magnet block; the permanent magnet magnet block is in an arc shape and is hinged to the Mounting slot on the permanent magnet bracket.

Further, involute grooves are processed on the surface of the leaf spring, and are evenly distributed on the leaf spring in a circular array. Radial forces cancel each other out.

Optionally, the intake valve plate and the exhaust valve plate are of four-pillar type structure, and the middle position is provided with a mounting hole, and the structure of the contact position with the intake hole of the piston is circular, which is used to optimize the intake valve plate. and the opening pressure of the exhaust valve plate;

The suction valve sheet and the exhaust valve sheet are pressed against the front end of the piston through a set screw, and the front end of the cylinder is provided with an exhaust hole for discharging high-pressure gas; the exhaust valve sheet is closely attached to the front end of the piston. On the upper side of the cylinder, when the gas pressure reaches the opening pressure of the exhaust valve plate, the exhaust valve plate is opened, and exhaust is performed through the gap of the exhaust valve plate.

From the above, the moving magnet compressor with the new structure of the present invention supports the permanent magnet magnet block by using the permanent magnet bracket, thereby reducing the air gap, greatly reducing the possibility of magnetic leakage, and increasing the specific thrust of the motor. In addition, the new structure of the moving magnet compressor adopts a resonant spring system composed of flexible leaf springs and resonant cylindrical springs, so that the entire compressor system has good axial support and radial support, and is composed of flexible leaf springs and cylindrical springs. The resonant spring system will give the mover a certain restoring force during the working process of the compressor and play the role of preventing the compressor from hitting the cylinder. By using the resonant spring system, the entire compressor system can achieve a more ideal resonant working state. The round hole on the outside of the plate spring and the threaded hole on the motor fixing frame are connected by screws, so that the plate spring and the surface of the motor fixing frame are closely attached together, and the force of the plate spring is uniform. The linear motor shaft plays a certain radial support role, and the resonant cylindrical spring is installed between the spring seat and the groove of the end cover, which has a large rigidity and plays a strong axial support role. Through the structural optimization design of each part in the suction and exhaust assembly, the entire suction and exhaust part has a good noise reduction effect, and the setting of the suction and exhaust assembly enables the noise to be controlled.

Description of drawings

1 is a schematic cross-sectional view of the overall structure of the moving magnet linear compressor of the present invention;

2 is a perspective view of the internal overall structure of the moving magnet linear compressor of the present invention;

3 is a left side view of the internal overall structure of the moving magnet linear compressor of the present invention;

4 is a right side view of the internal overall structure of the moving magnet linear compressor of the present invention;

5 is a sectional view of a middle position of the internal overall structure of the moving magnet linear compressor of the present invention;

6 is a cross-sectional view of another intermediate position of the internal overall structure of the moving magnet linear compressor of the present invention.

In the figure, 1. Compressor housing; 2. Exhaust pipe; 3. Locking cap; 4. Clamping cover; 5. 6. Exhaust muffler; 7. Exhaust valve plate; 8. Cylinder; 9. Suction valve plate; 10. Piston rod of cylinder; 11. Cylinder intake plug; 12. Damping support; 13. Leaf spring; 14. Right cylindrical spring seat; 15. Right end cover; 16. Resonant cylindrical spring; 17 , linear motor shaft; 18, permanent magnet bracket; 19, right motor fixing frame; 20, inner yoke; 21, permanent magnet magnet block; 22, outer yoke; 23, inner coil; 24, outer coil; 25, left Motor fixing frame; 26, transition support frame; 27, permanent magnet support plug; 28, stepped shaft sleeve; 29, left cylindrical spring seat; 30, left end cover; 31, suction pipe.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work, any modifications, equivalent replacements, improvements, etc., should be included in the protection scope of the present invention. Inside.

It should be noted that all directional indications (such as outside, inside, left, right...) in the embodiments of the present invention are only used to explain the relative positional relationship between the various components under a certain posture (as shown in the accompanying drawings), Movement conditions, etc., if the specific posture changes, the directional indication also changes accordingly. Wherein, “left” corresponds to the left side in FIG. 1 , and “right” corresponds to the right side in FIG. 1 .

Referring to FIGS. 1 to 6 , the moving magnet linear compressor of the present invention will be described in detail. The moving magnet linear compressor of the present invention is often used in refrigeration equipment such as refrigerators and air conditioners.

The moving magnet linear compressor of the present invention includes a compressor casing 1, a damping support 12, a mover assembly, a suction and exhaust assembly, a stator assembly, and end covers 15 and 30. The stator assembly includes an inner yoke 20, The inner coil 23 , the outer coil 24 , the outer yoke 22 , the motor fixing frames 19 , 25 , and the motor fixing frames 19 , 25 are fixedly connected to the compressor casing 1 through the shock absorbing support 12 , and the compressor casing 1 is inside The upper side and the lower side each have two elastic support installation grooves for fixing the shock absorbing support 12 , and the shock absorbing support 12 may be a rubber-type elastic support. The inner coil 23 and the outer coil 24 are respectively wound around the cavity where the inner yoke 20 and the outer yoke 22 are respectively located. The outer yoke 22 and the inner yoke 20 are both fixed on the motor fixing frames 19 and 25 .

The upper and lower ends of the motor fixing frames 19 and 25 of the present invention are respectively provided with two cylindrical flanges, which are used to connect with the shock-absorbing support 12, and four sets of bosses are arranged on the side ends, and each set of two bosses is parallel to each other. The distance between the bosses is equal to the cross-sectional width of the outer yoke 22 . The outer and inner rings of the motor fixing frames 19 and 25 are provided with grooves for fixing and supporting the outer yoke 22 and the inner yoke 20. The outer yoke 22 is installed in the grooves of the motor fixing frames 19 and 25. After it is in the groove, its position is fixed and clamped with a boss. The outer yoke 22 is formed by stacking a plurality of E-shaped silicon steel sheets. Both ends of the outer yoke 22 of the E-shaped structure have arc-shaped flanges. extracted above. The inner coil 23 and the outer coil 24 are divided into an inner yoke coil and an outer yoke coil. The outer yoke coil is wound in the cavity of the outer yoke 22, and the inner yoke coil is wound around the inner yoke 20. In the cavity, the boss of the inner yoke 20 is provided with a lead slot, and the coil of the inner yoke after winding is drawn out through the lead slot of the inner yoke 20 .

The mover assembly of the present invention includes a piston arranged in the cylinder 8 , a linear motor shaft 17 , a permanent magnet magnet block 21 , a permanent magnet support 18 , a permanent magnet support plug 27 , a leaf spring 13 , a resonant cylindrical spring 16 , and a stepped bushing 28 , wherein the linear motor shaft 17 is located on the central axis of the inner yoke 20, and the permanent magnet magnet block 21 is embedded in the side wall of the permanent magnet bracket 18 and can pass through the inner yoke 20 and all The space between the outer yokes 22 is reciprocated, the right end of the permanent magnet support 18 is fitted with the shoulder of the linear motor shaft 17, and the left end is fixedly connected with the permanent magnet support plug 27. The outer ring of the permanent magnet support plug 27 is connected with the permanent magnet support 18 , and the inner hole of the permanent magnet support plug 27 is fixedly connected with the linear motor shaft 17 , which respectively serve to support the permanent magnet support 18 and the linear motor shaft 17 . The role of fixed support. The piston rod 10 of the cylinder 8 is connected with the left end of the linear motor shaft 17 by means of screw connection, the stepped shaft sleeve 28 is sleeved on the outer diameter of the piston rod 10, and the right end face of the stepped shaft sleeve 28 Fitted with the end face of the linear motor shaft 17 .

The outer ring of the leaf spring 13 is fixedly connected with the end covers 15, 30, the motor fixing frames 19, 25 and the transition support frame 26 (there is no transition support frame on the right side). There are circular hole-shaped connecting parts on the outside of both ends, which are used for fixing with the motor fixing frame 25 and for fixing the leaf spring 13 (left side) and the left end cover 30 . The ends of the motor fixing frames 19, 25, the transition support frame 26, and the end covers 15, 30 are respectively provided with threaded connection holes, and the outer periphery of the leaf spring 13 is provided with circular holes, which are connected together by screws. The central portion of the leaf spring 13 (left side) is in contact with the end portion of the stepped bushing 28 and the left cylindrical spring seat 29, and the central portion of the leaf spring 13 (right side) is fitted with the linear motor shaft 17 The shaft shoulder and the end of the right cylindrical spring seat 14 fit together, and the two ends of the resonant cylindrical spring 16 are in fixed contact with the cylindrical spring seats 14, 29 and the grooves in the middle of the end covers 15, 30 respectively, so The type of the resonant cylindrical spring 16 is a cylindrical spring with horizontal ends, and its function is to make the cylindrical spring fully contact the cylindrical spring seats 14 and 29 . The right cylindrical spring seat 14 is locked on the linear motor shaft 17 by a nut. The bottom end of the left cylindrical spring seat 29 is provided with a protrusion, and the bottom end of the right cylindrical spring seat 14 is horizontal.

The suction and exhaust assembly of the present invention includes a suction valve plate 9, an exhaust valve plate 7, a cylinder intake plug 11, exhaust mufflers 5, 6, a locking cap 3, and a pressing cap 4. Inside the compressor housing 1 The cylinder 8 is fixed in the center hole of the left end cover 30, the intake valve plate 9 and the exhaust valve plate 7 are fixed on the upper end surface of the piston of the cylinder 8 by locking screws, and the intake plug 11 of the cylinder is from The bottom of the cylinder is inserted into the cylinder 8, the cylinder intake plug 11 is evenly distributed with four intake holes in the circumferential direction, the front end of the piston has intake and exhaust holes arranged in the circumferential direction, and its center position has the same diameter as the piston. The rod 10 is fastened to the inner thread of the connection, and its maximum stroke is 9.5mm. The exhaust mufflers 5 and 6 are divided into two parts, one of which is a hemispherical cavity, and the other is a stepped cylindrical cavity with an exhaust pipe 2 , wherein the bottom of the hemispherical cavity is connected to the cylinder 8 . The bottom of the stepped cylindrical cavity is in contact with the outer surface of the hemispherical cavity. By pressing the lower end of the cover 4 and the upper surface of the cylinder 8, the locking cap 3 It is screwed with the pressing cap 4, and the exhaust pipe 2 is pressed between the locking cap 3 and the protruding tube of the stepped cylindrical cavity. Therefore, the structure of the exhaust mufflers 5 and 6 is composed of two parts: inner concave and outer convex. The structure of the muffler is optimized through the analysis of the gas circuit and the flow field, so as to minimize the noise.

In addition, the permanent magnet bracket 18 of the present invention is in the shape of a cylindrical fence, and has a mounting slot in the middle position thereof for installing and fixing the permanent magnet magnet block 21 , the permanent magnet magnet block 21 and the mounting slot on the permanent magnet bracket 18 The connection relationship is hinged, and the permanent magnet magnet block 21 is in the shape of an arc.

Among them, the linear motor shaft 17 is a stepped shaft (variable diameter shaft), its right end is an external thread, which is used to fix the plate spring 13 and the right spring seat 14, and its left end is a countersunk hole inner thread, which is used for connecting with the piston rod 10. The external thread is used for connection, and the intermediate part transitions to the shoulder for fixing the permanent magnet bracket 18 . The stepped shaft sleeve 28 belongs to a transition piece, and its structure is stepped, and its function is embodied as a transition function and a supporting function for the leaf spring 13 .

The surface of the plate spring 13 is machined with involute grooves, and the involute grooves are evenly distributed on the plate spring 13 in a circular array. The uniform distribution of the involute grooves makes the compressor work. The radial forces cancel each other out.

The intake valve plate 9 and the exhaust valve plate 7 of the present invention are of four-pillar type structure, there are installation holes in the middle, and the structure of the contact position with the intake hole of the piston is circular, and its structure is in order to optimize the intake valve plate 9 , the opening pressure of the exhaust valve plate 7. The suction valve plate 9 and the exhaust valve plate 7 are pressed against the front end of the piston through set screws, and the front end of the cylinder 8 has an exhaust hole for discharging high-pressure gas; the exhaust valve plate 7 Close to the upper side of the cylinder 8, when the gas pressure reaches the opening pressure of the exhaust valve plate 7, the exhaust valve plate 7 is opened, and the exhaust valve is exhausted through the notch of the exhaust valve plate 7.

The whole working process of the moving magnet linear compressor of the present invention is as follows: when alternating current is supplied to the inner coil 23 and the outer coil 24 of the compressor, the inner coil 23 and the outer coil 24 will generate an alternating magnetic field. In this case, the direction of the magnetic field force on the permanent magnet block 21 on the permanent magnet support 18 is also constantly changing. Under the driving of the magnetic field force with the changing direction, the permanent magnet block 21 drives the permanent magnet support 18, thereby driving the permanent magnet support 18. The linear motor shaft 17 starts to perform a reciprocating linear motion, thereby driving the piston to compress the gas to do work, and the piston motion compresses the low-temperature and low-pressure refrigerant gas into a high-temperature and high-pressure refrigerant gas.

In the present invention, the permanent magnet magnet block 21 is embedded in the permanent magnet bracket 18 to reduce the air gap and increase the specific thrust of the motor. The setting keeps noise under control. By optimizing the structure of a plurality of components, the invention realizes the functions of compact structure, stable connection, high operation efficiency, low noise and long service life of the compressor.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (8)

1. A moving magnet linear compressor, comprising a compressor casing (1), a stator assembly and a mover assembly located in the compressor casing (1), characterized in that: The stator assembly includes an inner yoke (20) located on the central axis of the compressor housing (1), an outer yoke (22) arranged around the inner yoke (20), and the inner yoke ( 20) Motor fixing brackets (19, 25) fixed with the outer yoke (22), the motor fixing brackets (19, 25) are elastically supported on the compressor housing (1) through the shock-absorbing support (12) ) on the inner wall; The mover assembly includes a linear motor shaft (17) axially passing through the inner yoke (20), located between the inner yoke (20) and the outer yoke (22) and connected to the linear motor A permanent magnet support (18) connected to a shaft (17), a leaf spring (13) and a resonant cylindrical spring (16) located at the end of the linear motor shaft (17), the left end of the linear motor shaft (17) is connected to the cylinder The piston rod (10) of (8) is connected; A permanent magnet magnet block (21) is embedded on the permanent magnet support (18), and the permanent magnet magnet block (21) can pass through the space between the inner yoke (20) and the outer yoke (22). The gap performs reciprocating motion, and the reciprocating motion of the permanent magnet block (21) drives the permanent magnet support (18) and the linear motor shaft (17) to move, and then drives the piston of the cylinder (8) to compress the gas to do work to convert the low temperature and low pressure. The refrigerant gas is compressed into high temperature and high pressure refrigerant gas; The compressor housing (1) is also provided with a suction and exhaust assembly for reducing the working noise of the compressor; the suction and exhaust assembly includes a suction valve plate (9), an exhaust valve plate (7), a cylinder inlet and outlet. an air plug (11), and an exhaust muffler (5, 6), the suction valve plate (9) and the exhaust valve plate (7) are fixed on the end surface of the piston by locking screws; the cylinder The intake plug (11) is inserted into the cylinder (8) from the bottom of the cylinder (8); The exhaust muffler (5, 6) is divided into two parts, one of which is a hemispherical cavity, and the other is a stepped cylindrical cavity with an exhaust pipe (2), wherein the hemispherical cavity is The bottom is attached to the upper surface of the cylinder (8), the bottom of the stepped cylindrical cavity is attached to the outer surface of the hemispherical cavity, and the lower end of the cover (4) is pressed against the cylinder ( 8), the upper surface of the pressing cover (4) is threadedly connected with a locking cap (3), and the exhaust pipe (2) is pressed against the locking cap (3) and the stepped cylinder between the protruding tubes of the shaped cavity. 2. The moving magnet linear compressor according to claim 1, characterized in that, the inner coil (23) and the outer coil (23) and the outer coil(24); The outer yoke (22) is formed by superimposing a plurality of E-shaped silicon steel sheets. The outer yoke (22) of the E-shaped structure has arc-shaped flanges at both ends, and the wound outer coil (24) can be wound. Directly lead out from the outer yoke (22); A lead slot is provided at the boss of the inner yoke (20), and the wound inner coil (23) is drawn out through the lead slot. 3 . The moving magnet linear compressor according to claim 1 , wherein the right end of the permanent magnet bracket ( 18 ) is fitted with the shoulder of the linear motor shaft ( 17 ), and the left end of the permanent magnet bracket ( 18 ) is fitted with the permanent magnet The support plug (27) is fixedly connected, and the center of the permanent magnet support plug (27) is fixedly connected with the linear motor shaft (17); A stepped shaft sleeve (28) is sleeved on the outer diameter of the piston rod (10), and the right end face of the stepped shaft sleeve (28) is fitted with the end face of the linear motor shaft (17); The leaf spring (13) includes a left leaf spring and a right leaf spring respectively located at the left end and the right end of the linear motor shaft (17). 19) Fixedly connected together; the outer ring of the left leaf spring is fixedly connected with the left motor fixing frame (25), the left end cover (30) and the transition support frame (26). 4 . The moving magnet linear compressor according to claim 3 , wherein the central part of the left leaf spring is fitted with the end parts of the stepped shaft sleeve ( 28 ) and the left cylindrical spring seat ( 29 ). 5 . , the central part of the right leaf spring is fitted with the shoulder of the linear motor shaft (17) and the end of the right cylindrical spring seat (14); The resonant cylindrical spring (16) includes a left resonant cylindrical spring and a right resonant cylindrical spring, and two ends of the right resonant cylindrical spring are respectively in fixed contact with the grooves in the middle of the right cylindrical spring seat (14) and the right end cover (15). ; The two ends of the left resonant cylindrical spring are respectively in fixed contact with the grooves in the middle of the left cylindrical spring seat (29) and the left end cover (30); The right cylindrical spring seat (14) is locked on the linear motor shaft (17) by a nut. 5. The moving magnet linear compressor according to claim 1, characterized in that, the upper end and the lower end of the motor fixing frame (19, 25) each have two cylindrical flanges, which are used for connecting with the shock absorbing The support members (12) are connected, and four sets of bosses are arranged at the side ends of the support members, two bosses in each set are parallel to each other, and the distance between the two bosses in each set is equal to the cross-sectional width of the outer yoke (22). After the outer yoke (22) is installed in the groove of the motor fixing frame (19, 25), the position of the outer yoke (22) is fixed and clamped by means of a boss. 6 . The moving magnet linear compressor according to claim 1 , wherein the permanent magnet support ( 18 ) is in the shape of a cylindrical fence, and has a magnet block ( 21); the permanent magnet block (21) is arc-shaped, and is hinged to the mounting slot on the permanent magnet bracket (18). 7 . The moving magnet linear compressor according to claim 1 , wherein the surface of the leaf spring ( 13 ) is machined with involute grooves, which are evenly distributed on the leaf spring ( 13 ) in a circular array. 8 . On the upper side, the evenly distributed involute grooves make the radial force of the gas on the leaf spring (13) cancel each other out during the working process of the compressor. 8 . The moving magnet linear compressor according to claim 1 , wherein the suction valve piece ( 9 ) and the exhaust valve piece ( 7 ) are of a four-pillar type structure, and a mounting hole is provided in the middle position, The structure of its contact position with the intake hole of the piston is circular, which is used to optimize the opening pressure of the intake valve plate (9) and the exhaust valve plate (7); The suction valve sheet (9) and the exhaust valve sheet (7) are pressed against the front end of the piston through a set screw, and an exhaust pipe (2) is provided at the front end of the cylinder (8) for discharging High pressure gas; the exhaust valve sheet (7) is closely attached to the upper side of the cylinder (8), when the gas pressure reaches the opening pressure of the exhaust valve sheet (7), the exhaust valve sheet (7) opens, Exhaust through the notch of the exhaust valve plate (7).

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