CN211777872U - Linear compressor - Google Patents

Abstract

The utility model relates to the technical field of compressors, and discloses a linear compressor, which comprises a stator, a mover, a piston and a cylinder arranged in the same axial direction, and also comprises a leaf spring arranged at one or both ends of the stator. The leaf spring comprises a plurality of Free end; the first end of the piston is connected to the mover, and the second end is inserted into the cylinder; the middle part of the leaf spring is connected to the piston, each free end of the leaf spring is connected to the corresponding end of the stator, or at least one free end of the leaf spring is connected The other free ends of the piston and the leaf spring are connected to the corresponding ends of the stator; the utility model has a simple structure, and the piston is radially positioned and installed through the low-cost leaf spring, which effectively avoids the radial displacement of the piston, and realizes the free movement of the piston in the cylinder. The contact reciprocating motion can realize the oil-free or oil-lubricated linear compressor, reduce the working noise of the linear compressor, and greatly reduce its axial size.

Description

a linear compressor

technical field

The utility model relates to the technical field of compressors, in particular to a linear compressor.

Background technique

Linear compressor is a kind of piston compressor using linear motor. It has the advantages of compact structure, light weight, no oil or less lubricating oil, and excellent variable capacity characteristics. As a result, it has been widely used and has become a small A major development direction of high-efficiency compressors for refrigeration units.

The linear motor includes a stator and a mover, and the mover performs linear reciprocating motion along the axial direction. The moving magnet linear oscillating motor is one of the typical linear motors. Its structure is to install a magnetic conductive material on the circumference of the excitation coil to form a magnetic circuit structure with a cylindrical air gap concentric with the excitation coil. The inner and outer stators form an air gap, and the radially magnetized cylindrical permanent magnets reciprocate in the air gap. This linear motor is widely used as the driver of linear compressors due to its optimized magnetic circuit structure and the advantages of small magnetic circuit loss. A resonant coil spring is set between the cylinder and the piston of the linear compressor. The reciprocating motion of the piston inside the cylinder.

However, since the resonant coil spring has a larger axial installation size, this greatly increases the axial size of the linear compressor; at the same time, since the resonant coil spring is axially arranged between the cylinder and the piston, this makes the piston in the axial direction. While reciprocating in the axial direction, there will also be a large radial offset during the reciprocating movement due to vibration, and then a large contact sliding friction will be generated between the piston and the cylinder. Lubricating oil is injected for oil lubrication, and the use of lubricating oil will deteriorate the heat exchange efficiency of the refrigeration system. After the compressor is scrapped, the post-processing of the lubricating oil will also bring serious environmental problems.

Utility model content

The embodiment of the present utility model provides a linear compressor, which is used to solve the problem that the existing linear compressor has a large axial dimension and a large contact sliding friction between the piston and the cylinder, which must be oil lubricated. question.

In order to solve the above technical problems, an embodiment of the present invention provides a linear compressor, which includes a stator, a mover, a piston and a cylinder arranged in the same axial direction, the piston is inserted into the cylinder, and the mover is inserted into the cylinder. It reciprocates in the axial direction under the driving of the stator, and also includes a leaf spring arranged at one or both ends of the stator; the leaf spring includes a plurality of free ends; the first end of the piston is connected to the mover, and the second end is connected to the mover. The end is inserted into the cylinder; the middle part of the leaf spring is connected to the piston, each free end of the leaf spring is connected to the corresponding end of the stator, or at least one free end of the leaf spring is connected to the The other free ends of the leaf springs are connected to the corresponding ends of the stator.

Wherein, there are a plurality of leaf springs located at the corresponding ends of the stator, and the plurality of leaf springs are stacked in sequence along the axial direction to form a leaf spring group; and/or, the leaf springs are distributed in the same plane Or an elastic member near the same plane, and also includes an elastic transition portion for connecting each free end, the elastic transition portion is a first combined shape formed by connecting a plurality of straight line segments or curved segments end to end in sequence, and the first combined shape The two ends are respectively provided with the free ends; or, the elastic transition portion is a second combined shape formed by connecting one end of a plurality of straight line segments or curved segments as a whole, and the corresponding straight line segments in the second combined shape or The other ends of the curved segments are respectively provided with the free ends.

Wherein, the stator includes an inner stator and an outer stator arranged coaxially, and a cylindrical air gap is formed between the inner stator and the outer stator; the mover is embedded in the cylindrical air gap, It comprises a coaxial connection between the mover frame and the annular permanent magnet; the piston is coaxially located on the inner side of the mover, and the first end of the piston is connected to the end of the mover frame away from the annular permanent magnet; and/ Or, it also includes a first fixing seat and a second fixing seat coaxially mounted on both ends of the stator, and the cylinder is mounted on the first fixing seat or the second fixing seat.

Wherein, the iron cores of the inner stator and the outer stator are both in the shape of hollow cylinders, and the outer sidewall of the iron core of the inner stator or the inner sidewall of the iron core of the outer stator is provided with excitation coils arranged in the circumferential direction; The mover includes a group of annular permanent magnets, and the magnetic poles of the annular permanent magnets are arranged in a radial direction.

Wherein, the inner stator is a hollow cylindrical iron core; the iron core of the outer stator is a hollow cylindrical shape, and a plurality of protrusions arranged along the circumference are also arranged on the inner side of the iron core. An excitation coil is wound around the protrusion; the mover includes two sets of coaxially connected annular permanent magnets, and the magnetic poles of the two sets of annular permanent magnets are radially arranged and arranged in opposite directions.

Wherein, the piston is provided with a suction passage running through its axial direction; a suction muffler is installed in the suction passage, and the outlet of the suction passage is located at the second end of the piston, and the outlet A suction control valve is installed at the place; an exhaust device is installed at the end of the cylinder away from the mover.

Wherein, a gas bearing sleeve is also installed on the first fixed seat or the second fixed seat or the cylinder, and the gas bearing sleeve is sleeved on the outer side of the piston; the gas bearing sleeve is the same as the cylinder. The shaft is connected and located at the end of the cylinder close to the mover or embedded on the inner side wall of the cylinder, and the side wall of the cylinder is provided with a connection for connecting the gas bearing sleeve and the exhaust device. Air supply channel, the gas bearing sleeve is made of porous material, the pore size of the porous material is 0.1 micron to 1000 microns, which is iron, aluminum, copper and other metal powder or iron, aluminum, copper and other metal wire mesh or carbon powder, Breathable porous breathable metal foam, porous breathable ceramic or porous breathable plastic processed from non-metallic powders such as graphite powder, silicon dioxide powder, engineering plastic powder, etc.

Wherein, it also includes an oil pump and an oil injection channel; the oil pump and the cylinder are jointly installed on the first fixed seat or the second fixed seat, one end of the oil injection channel is connected to the oil pump, and the other end passes through the corresponding oil pump in turn. The first fixed seat or the second fixed seat is communicated with the side wall of the cylinder and with the inner cavity of the cylinder.

Wherein, a vibration damping structure arranged along the axial direction is further provided between the piston and the first fixing seat or the second fixing seat.

Wherein, the surface of the piston is coated with a layer of wear-resistant self-lubricating coating, and the wear-resistant self-lubricating coating includes graphite-like coating, polyether ether copper coating, polyimide resin coating, diamond-like coating layer, Teflon coating, molybdenum disulfide coating, tungsten disulfide coating, graphite coating, chromium nitride coating, titanium aluminum silicon nitride coating, titanium aluminum nitride coating, titanium nitride coating , any one or a combination of at least two of alumina ceramic coating and phosphating coating.

In the linear compressor provided by the embodiment of the present invention, a leaf spring is arranged at one or both ends of the stator to connect the corresponding end of the stator with the piston, so that under the action of the alternating electromagnetic field generated by the excitation coil, the piston follows the When the mover connected to it reciprocates, the leaf spring acts as an energy storage element and can play a better resonance effect. Compared with the resonant spring built into the existing linear compressor, the leaf spring has a smaller axial dimension, so that the axial dimension of the linear compressor can be greatly reduced; It has a large radial and axial stiffness ratio. The radial positioning and installation of the piston through the leaf spring can effectively avoid the radial displacement of the piston during the reciprocating motion in the axial direction, and effectively reduce the relationship between the piston and the cylinder. The contact sliding friction between the two parts even realizes the non-contact reciprocating motion of the piston in the cylinder, which further ensures the stability and reliability of the linear compressor operation, and enables the linear compressor to operate without Oil lubrication can also be carried out with oil lubrication, realizing a variety of working modes; in addition, it can effectively avoid the interference between adjacent spring wires when the existing resonant spring works, effectively reducing the working time of the linear compressor. noise.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description The drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative work.

1 is a schematic cross-sectional structure diagram of a linear compressor shown in Embodiment 1 of the present utility model along its axial direction;

Fig. 2 is the side view structure schematic diagram of the linear compressor shown in Embodiment 1 of the present utility model;

3 is a schematic cross-sectional structure diagram of the linear compressor shown in Embodiment 2 of the present utility model along its axial direction;

4 is a schematic cross-sectional structure diagram of the linear compressor shown in Embodiment 3 of the present utility model along its axial direction;

5 is a schematic cross-sectional structure diagram of the linear compressor shown in Embodiment 4 of the present utility model along its axial direction;

6 is a schematic cross-sectional structure diagram of the linear compressor shown in Embodiment 4 of the present utility model along its radial direction;

7 is a schematic cross-sectional structural diagram of the linear compressor shown in Embodiment 5 of the present utility model along its axial direction;

8 is a schematic cross-sectional structure diagram of the linear compressor shown in Embodiment 6 of the present utility model along its axial direction;

9 is a schematic structural diagram of the first form of the leaf spring shown in the embodiment of the present utility model;

10 is a schematic structural diagram of the second form of the leaf spring shown in the embodiment of the present utility model;

11 is a schematic structural diagram of the third form of the leaf spring shown in the embodiment of the present utility model;

12 is a schematic structural diagram of the fourth form of the leaf spring shown in the embodiment of the present utility model;

FIG. 13 is a schematic structural diagram of the fifth form of the leaf spring shown in the embodiment of the present invention.

Description of reference numerals: 1. stator; 101, inner stator; 102, outer stator; 1021, iron core; 1022, excitation coil; 2, mover; 3, first fixed seat; 4, second fixed seat; 5, Piston; 6. Cylinder; 7. Gasket; 8. Leaf spring group; 9. First fastening seat; 10. Suction passage; 11. Suction muffler; 12. Exhaust chamber; 13. Exhaust valve; 14. Exhaust spring; 15. Exhaust muffler; 16. Gas bearing sleeve; 17. Oil pump; 18. Oil filling passage; 19. Housing cover; 20. Damping spring; 21. Damping block; 22. Second tightening Fixed seat.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. The embodiments described above are 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 fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a connectable connection. Removal connection, or integral connection; it can be a mechanical connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal communication of the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

The embodiment of the present utility model provides a linear compressor, which includes a stator, a mover, a piston and a cylinder arranged in the same axial direction. The piston is inserted into the cylinder and reciprocates in the axial direction under the driving of the mover, and further comprises: A leaf spring arranged at one or both ends of the stator, the leaf spring includes a plurality of free ends; the first end of the piston is connected to the mover, and the second end is inserted into the cylinder; the middle of the leaf spring is connected to the piston, and each free end of the leaf spring The corresponding end of the stator is connected, or at least one free end of the leaf spring is connected to the piston, and the other free end of the leaf spring is connected to the corresponding end of the stator.

Specifically, in the linear compressor shown in this embodiment, a leaf spring is arranged at one or both ends of the stator to connect the corresponding end of the stator with the piston, so that under the action of the alternating electromagnetic field generated by the excitation coil, the When the piston moves back and forth with the mover connected to it, the leaf spring acts as an energy storage element and can play a better resonance effect. Compared with the built-in resonance spring of the existing linear compressor, the leaf spring has a smaller axial dimension, so that the axial dimension of the linear compressor can be greatly reduced. At the same time, the leaf spring has a low production cost and has a large radial to axial stiffness ratio. The radial positioning and installation of the piston through the leaf spring can effectively avoid the radial direction of the piston in the process of reciprocating along the axial direction. The displacement effectively reduces the contact sliding friction between the piston and the cylinder, and even realizes the non-contact reciprocating motion of the piston in the cylinder, which further ensures the stability and reliability of the linear compressor operation, and makes the linear compression When the machine is working, it can be lubricated without oil or lubricated with oil, realizing a variety of working modes. In addition, the interference between adjacent spring wires during the operation of the existing resonant spring can also be effectively avoided, and the noise during the operation of the linear compressor can be effectively reduced.

It should be pointed out here that the provision of a leaf spring at one or both ends of the stator can be understood as the provision of a leaf spring at one end of the stator, so that the corresponding end of the stator can be connected with one end of the piston through the leaf spring, and the piston The other end of the stator is inserted into the cylinder at the other end of the stator. This installation structure can effectively reduce the contact sliding friction between the piston and the cylinder when reciprocating; The leaf springs are provided, so that at both ends of the stator, the corresponding ends of the stator can be connected to the piston correspondingly through the corresponding leaf springs, so that the piston can perform contactless reciprocating motion in the cylinder.

At the same time, in order to improve the working performance of the piston, a wear-resistant self-lubricating coating can be applied on the surface of the piston. The wear-resistant self-lubricating coating includes graphite-like coating (GLC), polyether ether copper coating (PEEK) ), polyimide resin coating (PI), diamond-like carbon coating (DLC), Teflon coating (Teflon), molybdenum disulfide coating (MoS ₂ ), tungsten disulfide coating (WS ₂ ), Graphite coating (C), chromium nitride coating (CRN), titanium aluminum silicon nitride coating (TiAlSiN), titanium aluminum nitride coating (AlTiN), titanium nitride coating (TiN), alumina ceramic coating Either one or a combination of at least two of the layer (Al ₂ O ₃ ) and the phosphating coating (P).

In addition, there are a plurality of leaf springs located at the corresponding ends of the stator, and the plurality of leaf springs are stacked in sequence along the axial direction to form a leaf spring group, wherein the plurality of leaf springs can pass through the first fastening seat 9 shown in the following embodiment. To realize the stacking in sequence, correspondingly, the corresponding ends of the stator are provided with second fastening seats 22 for securing the corresponding free ends of the leaf springs. As shown in FIG. , on the first fastening seat 9 and the second fastening seat 22 are correspondingly provided with multi-layer corresponding installation positions, each layer of installation position corresponds to a leaf spring, and the space between adjacent two leaf springs is also It is beneficial to prevent the interference of two adjacent leaf springs in the process of resonance, and thus lead to the generation of noise. Therefore, the leaf spring group formed by combining a plurality of leaf springs will have better rigidity, can better store energy, and provide radial support for the reciprocating motion of the piston.

Further, the leaf spring is an elastic member distributed in the same plane or near the same plane, and it also includes an elastic transition portion for connecting each free end, thus, whether the leaf spring is distributed in the same plane to its corresponding elastic transition portion There is no strict limit. The elastic transition portion is formed by connecting a plurality of straight line segments or curved segments end to end to form a first combined shape, and both ends of the first combined shape are respectively provided with the free ends.

It should also be pointed out here that the first combined shape can be formed by bending the spring wire for multiple times in the same plane. Obviously, the shape of each bending segment of the first combined shape includes a straight line segment, a curved In combination, the cross-section of the spring wire can be circular, oval, square or triangular, which is not specifically limited herein. Therefore, the combined shape obtained by bending can be "S" type, "C" type, "Z" type, "L" type, "ㄥ" type, "V" type, "U" type, "□" type , "┓" type, "く" type, "へ" type, "J" type, etc.

As shown in Figure 9, the leaf spring is made of a spring wire with a circular cross-section and is processed by at least 6 times of bending; The arc-shaped free ends at the head and tail ends are used for positioning and installation; thus, the corresponding free ends of the head and tail ends of the leaf spring can be connected to the end of one side of the stator, and the central position of the leaf spring can be connected to the stator The piston on the corresponding side is connected with the piston through the first fastening seat shown in the following embodiment, so as to support the piston to realize the reciprocating motion in the cylinder.

As shown in Figure 10, the leaf spring is made of a spring wire with a circular cross-section through at least 4 times of bending; its shape includes 3 straight lines (straight line), 2 connecting transition arcs (curve) Arc-shaped free ends for positioning and installation at both ends of the head and tail.

As shown in Figure 11, the leaf spring is made of a spring wire with a circular cross-section and is bent at least 22 times; Arc-shaped free ends for positioning and installation at both ends of the head and tail.

As shown in Figure 12, the leaf spring is made of a spring wire with a circular cross-section and is bent at least 12 times; its shape includes 10 arc segments (curve segments), 1 central connecting segment (straight line Arc-shaped free ends for positioning installation at both ends of the head and tail.

Of course, the leaf spring also includes other structural forms, which are not listed here.

At the same time, the elastic transition portion can also be a second combined shape formed by connecting one end of a plurality of straight or curved segments into one, and the other ends of the corresponding straight or curved segments in the second combined shape are respectively provided with free ends .

Thus, leaf springs of this form are arranged radially, apparently containing a plurality of free ends. As shown in FIG. 13 , a centrally symmetric arrangement of three curved segments in the leaf spring is disclosed, wherein the cross-section of each curved segment is rectangular, and one end of the three curved segments is connected by a ring structure , and the other ends of the three curved segments are set as corresponding free ends, the free ends are fan ring structures, and a plurality of fixing holes are opened on the fan ring structures. In this way, the annular structure at the central position of the leaf spring can be connected with the piston, and the fan annular structure corresponding to each radial end of the leaf spring can be connected with the end of the corresponding side of the stator, so as to support the piston in the cylinder. Reciprocating motion.

Based on the solutions shown in the above embodiments, the specific structural form of the linear compressor is introduced as follows.

Example 1,

As shown in FIG. 1 and FIG. 2 , in this embodiment, the stator 1 includes an inner stator 101 and an outer stator 102 arranged coaxially, and a cylindrical air gap is formed between the inner stator 101 and the outer stator 102 ; the mover 2 is embedded in the In the cylindrical air gap, there are coaxially connected mover skeletons and annular permanent magnets, wherein the mover skeletons have a cup-shaped structure; the piston 5 is coaxially located inside the mover 2, and the first end of the piston 5 passes through the pad The plate 7 is connected to one end of the mover frame away from the annular permanent magnet, whereby the piston 5 and the mover 2 form an integral moving part.

Specifically, the two ends of the stator 1 are provided with a first fixed seat 3 and a second fixed seat 4 that are coaxially arranged. Therefore, the inner stator 101 , the mover 2 and the outer stator 102 are arranged in turn in the radial direction, and the inner stator Both ends of the stator 101 and the outer stator 102 are correspondingly installed with the first fixing base 3 and the second fixing base 4 . At the same time, for the integral moving part formed by the piston 5 and the mover 2, a first fastening seat 9 is also installed in the center of the corresponding gasket 7 at the end of the piston 5, wherein the gasket 7 can be opened A plurality of ventilation holes, the first fastening seat 9 is connected to the middle of the leaf spring group 8 shown in the above embodiment, and the two free ends of the leaf spring group 8 are correspondingly connected to the first fixing seat through the corresponding second fastening seat 22 3. Thereby, the support piston 5 realizes reciprocating motion in the cylinder 6, wherein the cylinder 6 is coaxially installed in the second fixed seat 4.

Further, the iron cores of the inner stator 101 and the outer stator 102 are both hollow cylindrical, and the iron cores of the inner stator 101 and the outer stator 102 are formed by stacking a plurality of silicon steel sheets of corresponding shapes. As shown in FIG. 1 , which is specifically illustrated in FIG. 1 , the excitation coils 1022 arranged in the circumferential direction are arranged on the inner sidewall of the iron core 1021 of the outer stator 102 , and the inner stator 101 is configured as a pure iron core structure. Of course, excitation coils arranged in the circumferential direction may also be provided on the outer sidewall of the iron core of the inner stator 101 , and the outer stator 102 may be a pure iron core structure, which is not specifically limited here.

Correspondingly, the mover 2 includes a group of annular permanent magnets, and the magnetic poles of the annular permanent magnets are arranged in the radial direction, that is, the magnetic poles inside the annular permanent magnets are N poles, the outer magnetic poles are S poles, or the magnetic poles inside the annular permanent magnets are N poles. The pole is S pole, and the magnetic pole on the outside is N pole, which is not specifically limited. The annular permanent magnet can be an integral structure, or can be a plurality of tile-shaped magnets arranged in the circumferential direction. to make.

At the same time, in this embodiment, the piston 5 is provided with a suction passage 10 which penetrates along its axial direction; , and a suction control valve is installed at the corresponding outlet. The suction control valve is a one-way valve, specifically a reed valve. The suction control valve is not shown in FIG. 1; One end is equipped with an exhaust device.

Specifically, the suction channel 10 includes a central channel section and an inclined channel section, one end of the central channel section extends to the first end of the piston 5, the other end of the central channel section is connected to one end of the inclined channel section, and the inclined channel section includes a plurality of, The other end of each inclined channel section extends to the second end of the piston 5, wherein a suction muffler 11 arranged coaxially with the central channel section is installed, and a suction control valve is installed at the other end of the inclined channel section. The gas control valve is a reed valve.

It should be pointed out here that the suction muffler 11 can be made of foamed metal. The suction muffler 11 is a cylindrical body with a central shaft hole, and its outer sidewall is formed by staggered arrangement of convex parts and concave parts. The side wall of the suction muffler 11 is also provided with a plurality of groups of ventilation holes arranged at intervals along the axial direction, and each ventilation hole in each group is arranged in a circumferential direction, so that the linear compression can be effectively eliminated by the suction muffler 11 The noise produced by the machine during the suction process.

In addition, the exhaust device includes an exhaust chamber 12 , an exhaust muffler 15 , an exhaust spring 14 and an exhaust valve 13 located in the exhaust chamber 12 , wherein the exhaust chamber 12 is covered and installed in the cylinder 6 away from the mover 2 . One end; the exhaust valve 13 is a mushroom valve or a butterfly valve with a flat end, and is installed at the port of the end of the cylinder 6 away from the mover 2; the exhaust spring 14 is axially arranged between the exhaust valve 13 and the exhaust valve 13. Between the air mufflers 15; the exhaust muffler 15 has a horn-like structure, and the end of the exhaust muffler 15 away from the exhaust spring 14 is its bell mouth end, and the bell mouth end abuts on the side wall of the exhaust cavity 12, And the exhaust muffler 15 can also be made of foamed metal.

For the linear compressor shown in this embodiment, when the piston 5 moves to the left with the mover 2 relative to the cylinder 6 during the suction process, the suction control valve is opened and the exhaust valve 13 is closed. During the compression process, when the piston 5 moves to the right with the mover 2 relative to the cylinder 6, the suction control valve is closed at this time. When the pressure in the compression chamber formed by the piston 5 and the cylinder 6 is higher than the exhaust pressure, the exhaust pressure The air valve 13 is opened. At the same time, since most of the compression components such as the piston 5 and the suction muffler 11 are arranged inside the linear motor composed of the stator 1 and the mover 2, the linear compressor can make full use of the internal space of the linear motor, and greatly The space occupied by the linear compressor is reduced, and the overall size of the linear compressor is reduced.

Further, in this embodiment, a gas bearing sleeve 16 is also installed on the second fixed seat 4, and the gas bearing sleeve 16 is sleeved on the outer side of the piston 5; the gas bearing sleeve 16 is coaxially connected with the cylinder 6, and is located close to the cylinder 6. One end of the mover 2 and the side wall of the cylinder 6 are provided with an air supply channel for connecting the gas bearing sleeve 16 with the exhaust device. The air supply channel is not shown in FIG. 1 . It should be noted here that the gas The bearing sleeve 16 and the cylinder 6 can also be coaxially installed on the first fixed seat 3, or an annular groove is provided on the inner side wall of the cylinder 6, and the gas bearing sleeve 16 is embedded in the annular groove, and also ensures the gas bearing. The sleeve 16 is sleeved on the outer side of the piston 5 .

Therefore, the high-pressure gas in the exhaust chamber 12 can directly lead to the gas bearing sleeve 16 through the air supply channel. Since the gas bearing sleeve 16 is a hollow cylinder of porous material, the gas bearing sleeve 16 can be uniform for the outer side wall of the piston 5 It provides pneumatic floating support along the radial direction, and cooperates with the radial support provided by the leaf spring to the piston 5, which can greatly reduce the contact sliding friction between the piston 5 and the cylinder 6, and even realize the piston 5 in the cylinder 6. Reciprocates without contact for oil-free lubrication of linear compressors.

It should also be pointed out here that the pore size of the porous material shown in this embodiment is 0.1 micrometers to 1000 micrometers, which are metal powders such as iron, aluminum, and copper, or metal meshes such as iron, aluminum, copper, etc., or carbon powder, graphite, etc. It is a breathable porous breathable metal foam, porous breathable ceramic or porous breathable plastic processed from non-metallic powder such as powder, silicon dioxide powder, engineering plastic powder, etc.

Example 2,

As shown in FIG. 3 , this embodiment is based on a further improvement of Embodiment 1. The difference lies in that this embodiment is provided with leaf spring groups 8 on both sides of the stator 1 , that is, the leaf spring group 8 on the left side of the stator 1 . The middle part of the stator 1 is connected to the piston 5 on the corresponding side, the free end of the leaf spring group 8 is connected to the first fixed seat 3, and the middle part of the leaf spring group 8 on the right side of the stator 1 is connected to the end of the corresponding side piston 5, the leaf spring group 8 The free end of the cylinder 6 is connected to the second fixed base 4, wherein the cylinder 6 and its corresponding exhaust device can be arranged on the first fixed base 3 or on the second fixed base 4, which is not specifically limited.

Therefore, the two sets of leaf spring groups 8 jointly provide sufficient radial support for the piston 5 from both sides of the piston 5, which effectively avoids the "vertical head" phenomenon at the end of the piston 5 of the linear compressor. The gas bearing sleeve 16 shown in Embodiment 1 can no longer be installed in the machine, so that the non-contact reciprocating motion and oil-free lubrication of the piston 5 and the cylinder 6 can be realized.

Example 3,

As shown in FIG. 4 , this embodiment is based on a further improvement of Embodiment 1, and the difference lies in that the linear compressor shown in this embodiment does not need to provide the gas bearing sleeve 16 shown in Embodiment 1. In the first embodiment, a leaf spring group 8 is provided on one side of the stator 1 to provide better radial support for the piston 5 during the reciprocating motion in the cylinder 6, thereby greatly reducing the size of the piston 5 and the cylinder. In this embodiment, oil lubrication can be used to further reduce the contact friction between the piston 5 and the cylinder 6 and ensure a long service life of the linear compressor.

Therefore, in terms of the specific design, the oil pump 17 and the oil injection channel 18 can be provided, the oil pump 17 and the cylinder 6 can be installed on the second fixed seat 4 together, one end of the oil injection channel 18 is connected to the oil delivery end of the oil pump 17, and the oil injection channel 18 The other end of the cylinder penetrates through the corresponding second fixed seat 4 and the side wall of the cylinder 6 in turn, and communicates with the inner cavity of the cylinder 6 . Thus, lubricating oil can be injected into the cylinder 6 through the oil pump 17 and the corresponding oil injection channel 18 for lubrication and sealing of the matching clearance between the piston 5 and the cylinder 6 .

It should be pointed out here that in the actual design, the oil pump 17 and the cylinder 6 can also be installed on the first fixed seat 3. Correspondingly, the leaf spring group 8 is used to connect the second fixed seat 4 and the piston 5. Here, one end of the oil injection passage 18 is connected to the oil pump 17 , and the other end penetrates the corresponding first fixing seat 3 and the side wall of the cylinder 6 in sequence, and communicates with the inner cavity of the cylinder 6 .

Example 4,

As shown in FIG. 5 and FIG. 6 , this embodiment is based on a further improvement of Embodiment 1. The difference is that in this embodiment, the inner stator 101 is a hollow cylindrical iron core, and no excitation coil is provided on the inner stator 101 . ; The iron core 1021 of the outer stator 102 is in the shape of a hollow cylinder, and on the inside of its iron core 1021 is also provided with a plurality of protrusions arranged along the circumference, and an excitation coil 1022 is wound around each protrusion, wherein, Specifically, eight protrusions can be provided. Accordingly, eight excitation coils arranged in the circumferential direction are wound around the outer stator 102, and the iron cores of the inner stator 101 and the outer stator 102 are made of a plurality of silicon steel sheets of corresponding shapes. The mover 2 includes two sets of annular permanent magnets that are coaxially connected, and the magnetic poles of the two sets of annular permanent magnets are radially arranged and arranged in opposite directions, so that the inner side of one of the sets of annular permanent magnets can be arranged The magnetic pole is N pole, and the outer magnetic pole is S pole. Correspondingly, another group of annular permanent magnets is arranged with the inner magnetic pole of the S pole and the outer magnetic pole of the N pole. It can also be formed by connecting a plurality of tile-shaped magnets arranged in the circumferential direction through a shaping material, which is not specifically limited here.

Example 5,

As shown in FIG. 7 , this embodiment is based on a further improvement of Embodiment 4. The difference lies in that, the linear compressor shown in Embodiment 4 is provided with a leaf spring group 8 on one side of the stator to prevent the piston 5 in the On the basis that the reciprocating motion in the cylinder 6 provides better radial support, the gas bearing sleeve 16 is provided to provide even radial pneumatic floating support to the outer side wall of the piston 5, while the linear compressor shown in this embodiment The gas bearing sleeve 16 shown in Embodiment 4 is not required, but oil lubrication is used to further reduce the contact friction between the piston 5 and the cylinder 6 and ensure a long service life of the linear compressor.

Therefore, the oil pump 17 and the oil injection channel 18 can be provided in the specific scheme design, and the oil pump 17 and the cylinder 6 can be installed on the second fixed seat 4 together. One end of the oil injection channel 18 is connected to the oil delivery end of the oil pump 17. The other end passes through the corresponding second fixing seat 4 and the side wall of the cylinder 6 in sequence, and communicates with the inner cavity of the cylinder 6 . Thus, lubricating oil can be injected into the cylinder 6 through the oil pump 17 and the corresponding oil injection channel 18 for lubrication and sealing of the matching clearance between the piston 5 and the cylinder 6 .

It should be pointed out here that in the actual design, the oil pump 17 and the cylinder 6 can also be installed on the first fixed seat 3. Correspondingly, the leaf spring group 8 is used to connect the second fixed seat 4 and the piston 5. Here, one end of the oil injection passage 18 is connected to the oil pump 17 , and the other end penetrates the corresponding first fixing seat 3 and the side wall of the cylinder 6 in sequence, and communicates with the inner cavity of the cylinder 6 .

Example 6,

This embodiment is based on a further improvement of Embodiment 1, and the difference lies in that in the linear compressor shown in this embodiment, there is also an axial arrangement between the piston 5 and the first fixed seat 3 or the second fixed seat 4 damping structure.

Specifically, as shown in FIG. 8 , a set of leaf spring groups 8 is provided on the left side of the stator 1 , the middle of the leaf spring set 8 is connected to the end of the piston 5 on the corresponding side of the stator 1 , and the two free ends of the leaf spring set 8 The first fixed seat 3 is connected, and the cylinder 6 and its corresponding exhaust device are arranged on the second fixed seat 4 .

It should be pointed out here that a casing 19 is further provided on the side of the first fixing base 3 away from the second fixing base 4 . The damping structure shown in this embodiment may specifically include a damping spring 20 and a damping block 21 , the damping block 21 is installed in the middle of the damping spring 20 , the damping spring 20 is arranged in the axial direction, and one end of the damping spring 20 The end of the piston 5 is connected, and the other end is connected to the inner side wall of the housing 19 . Since the mover 2 of the linear compressor is connected to the first fixed seat 3 through the leaf spring group 8, when the mover 2 cooperates with the piston 5 to reciprocate, it will be caused by the resonance of the leaf spring group 8 and the vibration during the movement. The friction causes the body of the linear compressor (other parts except the mover 2) to generate a tiny vibration. At this time, by setting the damping block 21 and the damping spring 20, the vibration of the damping block 21 can be used to generate a small vibration. The force opposite to the body of the linear compressor can offset the vibration on the body of the linear compressor, thereby achieving the effect of reducing the vibration of the body of the linear compressor.

To sum up, the leaf springs shown in the above embodiments can be made by bending low-cost spring wires or processing high-elasticity strips or strips, so that a single-resonant leaf spring can be manufactured at low cost and at the same time has a larger size. Therefore, the linear compressor assembled based on the structure shown in the above embodiment can effectively reduce the axial dimension of the linear compressor required for installing the resonance spring in the prior art, and effectively The radial displacement of the piston 5 is avoided, the support bearing corresponding to the piston 5 in the existing linear compressor is omitted, and the contactless reciprocating motion of the piston 5 in the cylinder 6 is realized; at the same time, the linear compressor can also be realized. Without oil lubrication or with oil lubrication, the interference problem between adjacent spring wires of the existing resonance spring can be avoided, and the noise problem of the linear compressor caused by the resonance spring can be effectively solved.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the within the scope of protection of the present invention.

Claims (10)

1. A linear compressor comprises a stator, a rotor, a piston and a cylinder which are coaxially arranged, wherein the piston is inserted into the cylinder and reciprocates along the axial direction under the driving of the rotor;

the first end of the piston is connected with the rotor, and the second end of the piston is inserted into the cylinder;

the middle part of the leaf spring is connected with the piston, and each free end of the leaf spring is connected with the corresponding end of the stator, or at least one free end of the leaf spring is connected with the piston, and other free ends of the leaf spring are connected with the corresponding ends of the stator.

2. Linear compressor according to claim 1,

a plurality of leaf springs are arranged at the corresponding ends of the stator, and are sequentially stacked at intervals along the axial direction to form a leaf spring group;

and/or the leaf springs are elastic members distributed in the same plane or nearby the same plane, and the leaf springs further comprise elastic transition parts used for connecting the free ends;

the elastic transition part is a first combined shape formed by sequentially connecting a plurality of straight line sections or curve sections end to end, and the two ends of the first combined shape are respectively provided with the free ends; or the elastic transition part is in a second combined shape formed by integrally connecting one ends of a plurality of straight line sections or curved line sections, and the other ends of the corresponding straight line sections or curved line sections in the second combined shape are respectively provided with the free ends.

3. Linear compressor according to claim 1 or 2,

the stator comprises an inner stator and an outer stator which are coaxially arranged, and a cylindrical air gap is formed between the inner stator and the outer stator;

the rotor is embedded in the cylindrical air gap and comprises a rotor framework and an annular permanent magnet which are coaxially connected;

the piston is coaxially positioned on the inner side of the rotor, and the first end of the piston is connected with one end, far away from the annular permanent magnet, of the rotor framework;

and/or the stator further comprises a first fixing seat and a second fixing seat which are coaxially arranged at two ends of the stator, and the cylinder is arranged on the first fixing seat or the second fixing seat.

4. Linear compressor according to claim 3,

the iron cores of the inner stator and the outer stator are both in a hollow cylinder shape, and the outer side wall of the iron core of the inner stator or the inner side wall of the iron core of the outer stator is provided with excitation coils arranged along the circumferential direction; the rotor comprises a group of annular permanent magnets, and magnetic poles of the annular permanent magnets are arranged along the radial direction.

5. Linear compressor according to claim 3,

the inner stator is a hollow cylindrical iron core;

the iron core of the outer stator is in a hollow cylindrical shape, a plurality of protrusions which are arranged along the circumference are further arranged on the inner side of the iron core, and each protrusion is wound with an excitation coil;

the rotor comprises two groups of coaxially connected annular permanent magnets, and the magnetic poles of the two groups of annular permanent magnets are arranged along the radial direction and are arranged in opposite directions.

6. Linear compressor according to claim 3,

an air suction channel which penetrates through the piston along the axial direction of the piston is arranged in the piston;

a suction muffler is arranged in the suction channel, an outlet of the suction channel is positioned at the second end of the piston, and a suction control valve is arranged at the outlet;

and an exhaust device is arranged at one end of the cylinder, which is far away from the rotor.

7. Linear compressor according to claim 6,

the first fixed seat or the second fixed seat or the cylinder is also provided with a gas bearing sleeve, and the gas bearing sleeve is sleeved outside the piston;

the gas bearing sleeve is coaxially connected with the cylinder and is positioned at one end, close to the rotor, of the cylinder or embedded on the inner side wall of the cylinder, and a gas supply channel used for communicating the gas bearing sleeve with the exhaust device is arranged in the side wall of the cylinder.

8. Linear compressor according to claim 3,

the oil injection device also comprises an oil pump and an oil injection channel;

the oil pump and the cylinder are jointly installed on the first fixing seat or the second fixing seat, one end of the oil injection channel is communicated with the oil pump, and the other end of the oil injection channel sequentially penetrates through the corresponding first fixing seat or the corresponding second fixing seat and the side wall of the cylinder and is communicated with the inner cavity of the cylinder.

9. Linear compressor according to claim 3,

and a vibration damping structure arranged along the axial direction is further arranged between the piston and the first fixed seat or the second fixed seat.

10. Linear compressor according to claim 1,

the surface of the piston is coated with a wear-resistant self-lubricating coating, and the wear-resistant self-lubricating coating comprises any one or a combination of at least two of a graphite-like coating, a polyether ether copper coating, a polyimide resin coating, a diamond-like carbon coating, a Teflon coating, a molybdenum disulfide coating, a tungsten disulfide coating, a graphite coating, a chromium nitride coating, a titanium aluminum silicon nitride coating, a titanium aluminum nitride coating, a titanium nitride coating, an aluminum oxide ceramic coating and a phosphating coating.

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