CN115788822A - Plate spring for Stirling refrigerator and linear compressor - Google Patents

Abstract

The application relates to the technical field of refrigeration equipment, and discloses a plate spring for a Stirling refrigerator, which comprises a fixed ring, a central ring and a cantilever group, wherein the outer wall of the fixed ring is used for being connected with a shell of a compressor; the central ring is positioned on the inner side of the fixing ring, and the inner side wall of the central ring is provided with a fixing screw hole which is used for being connected with an ejector; the cantilever group comprises a plurality of first cantilevers and a plurality of second cantilevers, the first cantilevers are connected with the fixing ring and the central ring, the second cantilevers are connected with the fixing ring, a gap is arranged between the second cantilevers and the central ring, and the second cantilevers are used for being connected with the compression piston; the first cantilever and the second cantilever are both elastic structures. The plate spring of the present disclosure can support the compression piston and the ejector of the linear compressor at the same time, and the forces applied to the plate spring by the two are not the same, and can offset each other to a certain extent, thereby reducing the vibration of the whole machine. The present disclosure may also reduce the production cost of the linear compressor. The present application further discloses a linear compressor for a stirling cooler.

Description

Plate spring for Stirling refrigerator and linear compressor

Technical Field

The application relates to the technical field of refrigeration equipment, for example, relates to a plate spring for a Stirling refrigerator and a linear compressor.

Background

With the development of military, medical and aerospace technologies, cryogenic cooling devices are being used effectively in more and more fields. Among them, the stirling cryocooler has been widely focused in the field of refrigeration and low temperature since its simple structure, reliable operation, long life, and no-fault operation time that may even be up to ten years, and is favored by researchers.

When the Stirling refrigerator working by adopting the linear compressor is used, the permanent magnet in the linear compressor drives the piston to reciprocate in an alternating magnetic field, and the moving part is fixed by the plate spring, so that the radial movement of the moving part is limited while the axial movement of the moving part is ensured, and the Stirling refrigerator working by adopting the linear compressor is one of key parts of the linear compressor.

In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

1. the plate spring, by bearing the moving parts, transmits unbalanced vibration to the linear compressor complete machine, thereby causing the complete machine to vibrate.

2. The material consumption of the conventional flat spring in the production process is large, and the production cost is obviously increased in the mass production.

It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present application and therefore may include information that does not constitute prior art known to a person of ordinary skill in the art.

Disclosure of Invention

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.

The embodiment of the disclosure provides a plate spring for a Stirling refrigerator and a linear compressor, so as to reduce the overall vibration of the linear compressor caused by the plate spring and reduce the production cost of the linear compressor.

In some embodiments, the plate spring for a stirling cooler includes a fixed ring, a center ring, and a cantilever set, the fixed ring outer wall for connecting with a housing of a compressor; the central ring is positioned on the inner side of the fixing ring, and the inner side wall of the central ring is provided with a fixing screw hole which is used for being connected with the discharger; the cantilever group comprises a plurality of first cantilevers and a plurality of second cantilevers, the first cantilevers are connected with the fixing ring and the central ring, the second cantilevers are connected with the fixing ring, a gap is arranged between the second cantilevers and the central ring, and the second cantilevers are used for being connected with the compression piston; the first cantilever and the second cantilever are both elastic structures.

Optionally, one end of the second suspension arm near the center ring is provided with a connection hole for connecting with the compression piston.

Optionally, the plurality of first cantilevers and the plurality of second cantilevers are arranged on the fixing ring in a staggered manner.

Optionally, the plurality of first cantilevers and the plurality of second cantilevers are respectively and uniformly arranged on the inner wall of the fixing ring.

Optionally, the cantilever sets are arranged in a central symmetry manner by taking the axis of the central ring as an axis.

Optionally, the first cantilever and the second cantilever are both arc-shaped cantilevers.

In some embodiments, the linear compressor includes a housing, a compression piston, an annular silicon steel sheet, an ejector, and a plate spring as above; the shell is connected with the outer wall of the fixing ring of the plate spring; the compression piston is connected with the second cantilever of the plate spring; a through groove is formed in the middle of the annular silicon steel sheet, the compression piston is installed in the through groove, and the annular silicon steel sheet generates an ampere force in a power-on state and is used for driving the compression piston to move in a reciprocating mode; the ejector includes a connecting rod connected to the center ring of the leaf spring through the compression piston.

Optionally, the linear compressor further comprises a first support member comprising a connecting structure, a first end of the connecting structure being connected to the compression piston and a second end being connected to the second cantilever.

Optionally, a first guide hole is formed in the annular silicon steel sheet, and the extending direction of the first guide hole is the same as the extending direction of the compression piston; the first supporting piece is provided with a guide arm, the guide arm is connected with the periphery of the connecting structure, and the guide arm can move in the first guide hole.

Optionally, the linear compressor further includes a second supporting member, the second supporting member is connected to the annular silicon steel sheet, the second supporting member is of an annular structure, a hollow center in the middle of the second supporting member is used for guiding the compression piston, a second guiding hole is formed in the second supporting member, the second guiding hole corresponds to the first guiding hole in position, and the second guiding hole is used for guiding the guiding arm of the first supporting member.

The plate spring and the linear compressor for the Stirling refrigerator provided by the embodiment of the disclosure can realize the following technical effects:

the plate spring of the present disclosure can simultaneously support the compression piston and the ejector of the linear compressor, wherein the fixing ring of the plate spring is located at the outermost side, fixed on the inner wall surface of the compressor housing, for providing support for the plate spring.

First cantilever and the second cantilever of cantilever group all are connected with solid fixed ring, and wherein, first cantilever still is connected with the centre ring, because be provided with on the centre ring and be used for the fixed screw hole of being connected with the ejector, first cantilever can support for the ejector provides, and the second cantilever is connected with compression piston, can be used for supporting compression piston.

In the linear compressor of the Stirling refrigerator, the compression piston and the discharger can do linear reciprocating motion, the compression piston, the discharger and the surrounding heat exchange structural shell jointly form a compression cavity, and the working medium does sinusoidal motion in the compression cavity, enters the cold end heat exchanger through the heat exchanger, the heat regenerator and other components on the outer side, and finally expands in the expansion cavity. The compression piston realizes active motion under the action of the electrified silicon steel sheet, and the ejector realizes passive motion under the combined action of the gas in the compression cavity and the gas in the expansion cavity.

The compression piston moves with the second cantilever, and the ejector is fixed to the center ring of the plate spring by a connecting rod and moves with the first cantilever.

Because the ejector and the compression piston have phase difference, the forces applied to the plate spring by the ejector and the compression piston are not the same, and can be mutually offset to a certain extent, so that the vibration of the whole machine is reduced.

In addition, this disclosure unites two into one compression piston and ejector's leaf spring, can effectively reduce the consumptive material in the production and processing process, reduces linear compressor's manufacturing cost.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:

FIG. 1 is a schematic diagram of a plate spring for a Stirling cooler according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram illustrating the operation of a leaf spring provided in an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of a linear compressor for a Stirling cooler according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a first support according to an embodiment of the disclosure.

Reference numerals are as follows:

10: a plate spring; 11: a fixing ring; 12: a center ring; 13: a first cantilever; 14: a second cantilever;

20: a compression piston;

30: an ejector; 31: a connecting rod;

40: a housing; 41: an expansion chamber; 42: a compression chamber;

50: an annular silicon steel sheet; 51: a first guide hole;

60: a first support member; 61: a connecting structure; 62: a guide arm;

70: a second support member; 71: a second guide hole.

Detailed Description

So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.

The terms "first," "second," and the like in the description and claims of the embodiments of the disclosure and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present disclosure described herein may be made. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

In the embodiments of the present disclosure, terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the disclosed embodiments and their examples and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation. Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the embodiments of the present disclosure may be understood as specific cases by those of ordinary skill in the art.

In addition, the terms "disposed," "connected," and "secured" are to be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. Specific meanings of the above terms in the disclosed embodiments can be understood by those of ordinary skill in the art according to specific situations.

The term "plurality" means two or more, unless otherwise specified.

In the embodiment of the present disclosure, the character "/" indicates that the preceding and following objects are in an or relationship. For example, A/B represents: a or B.

The term "and/or" is an associative relationship that describes objects, meaning that three relationships may exist. For example, a and/or B, represents: a or B, or A and B.

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

As shown in fig. 1 and 2, the present disclosure provides a plate spring 10 for a stirling cooler, including a fixed ring 11, a center ring 12, and a cantilever arm assembly.

The outer wall of the fixed ring 11 is used for connection with the casing 40 of the compressor.

The center ring 12 is located inside the fixing ring 11, and the inner sidewall of the center ring 12 is provided with fixing screw holes for connecting with the ejector 30.

The cantilever group comprises a plurality of first cantilevers 13 and a plurality of second cantilevers 14, the first cantilevers 13 are connected with the fixing ring 11 and the central ring 12, the second cantilevers 14 are connected with the fixing ring 11, a gap is arranged between the second cantilevers 14 and the central ring 12, and the second cantilevers 14 are used for being connected with the compression piston 20; the first suspension arm 13 and the second suspension arm 14 are both elastic structures.

It can be understood that, in the linear compressor of the stirling cryocooler, the compression piston 20 and the ejector 30 can both reciprocate linearly, the compression piston 20, the ejector 30 and the surrounding heat exchange structure housing 40 together form a compression chamber 42, and the working medium moves sinusoidally in the compression chamber 42, passes through the outer heat exchanger, the regenerator and other components, enters the cold-end heat exchanger, and finally expands in the expansion chamber 41. The compression piston 20 is actively moved by the permanent magnet under the action of the electrified silicon steel sheet, and the ejector 30 is passively moved by the combined action of the gas in the compression chamber 42 and the gas in the expansion chamber 41. Therefore, the ejector 30 and the compression piston 20 have phase difference in movement, and the gas working medium in the working space performs reverse Stirling cycle, and sequentially performs four processes similar to isothermal compression, constant volume heat release, isothermal expansion and constant volume heat absorption to form thermodynamic cycle.

With the plate spring 10 for a stirling cooler provided in the embodiment of the present disclosure, it is possible to support both the compression piston 20 and the ejector 30 of the linear compressor, wherein the fixing ring 11 of the plate spring 10 is located at the outermost side and fixed on the inner wall surface of the compressor housing for providing support for the plate spring 10. The first boom 13 and the second boom 14 of the boom set are both connected to the fixed ring 11.

Wherein, the first cantilever 13 is further connected to the center ring 12, since the center ring 12 is provided with a fixing screw hole for connecting to the ejector 30, the first cantilever 13 can provide a support for the ejector 30, the second cantilever 14 is connected to the compression piston 20 and can be used for supporting the compression piston 20, so that the compression piston 20 moves along with the second cantilever 14, and the ejector 30 is fixed to the center ring 12 of the plate spring 10 by the connecting rod 31 and moves along with the first cantilever 13.

As shown in processes a, B, C, and D of fig. 2, since the ejector 30 and the compression piston 20 have a phase difference, the forces applied to the plate spring 10 by the ejector and the compression piston are not the same, and they can be offset to some extent, thereby reducing the vibration of the entire machine. The present disclosure can effectively reduce the material consumption in the production process and reduce the production cost of the linear compressor due to the combination of the compression piston 20 and the plate spring 10 of the discharger 30.

Optionally, the end of the second suspension arm 14 near the center ring 12 is provided with a coupling hole for coupling with the compression piston 20.

It will be appreciated that the connection end of the second boom 14 to the compression piston 20 is located at the free end of the second boom 14 to facilitate movement of the second boom 14 with the compression piston 20.

Alternatively, the first cantilevers 13 and the second cantilevers 14 are staggered on the fixing ring 11. The first suspension arms 13 are spaced apart from each other and the second suspension arms 14 are spaced apart from each other, so that the leaf spring 10 is prevented from being locally and intensively loaded with the force of the compression spring or the ejector 30, and the loaded position of the leaf spring 10 is uniform.

Alternatively, the plurality of first cantilevers 13 and the plurality of second cantilevers 14 are respectively uniformly disposed on the inner wall of the fixing ring 11. Therefore, the force born by the plate spring 10 can be relatively dispersed, and the vibration of the whole linear compressor caused by the vibration generated by the local plate spring 10 is reduced.

Alternatively, the cantilever sets are arranged in a central symmetry with the axis of the central ring 12 as the axis.

It is understood that the plurality of first suspension arms 13 and the plurality of second suspension arms 14 are arranged in a central symmetry about the axis of the center ring 12.

As an example, the first suspension arm 13 and the second suspension arm 14 are provided in an even number, and a connection line of end portions of the first suspension arm 13 provided oppositely is located on a diameter of the fixing ring 11.

Optionally, the first suspension arm 13 and the second suspension arm 14 are both arc-shaped suspension arms. Therefore, the lengths of the first cantilever 13 and the second cantilever 14 can be prolonged, so that when the plate spring 10 is deformed, the first cantilever 13 and the second cantilever 14 are relieved, and the impact on the plate spring 10 is reduced.

A plate spring 10 for a stirling cooler according to an embodiment of the present disclosure will be described below with reference to fig. 1 and 2.

The plate spring 10 for a stirling cooler according to the embodiment of the present disclosure may support the compression piston 20 and the ejector 30 at the same time. The leaf spring 10 comprises a fixed ring 11, a centre ring 12 and a set of cantilever arms.

The outer wall of the fixing ring 11 is used for being connected with a shell 40 of the compressor, the center ring 12 is located on the inner side of the fixing ring 11, and the inner side wall of the center ring 12 is provided with fixing screw holes which are used for being connected with the discharger 30.

The cantilever group is provided with eight cantilevers, and four nonadjacent cantilevers form a group. One group is four first cantilevers 13, the head ends of the first cantilevers 13 are connected with the fixing ring 11, and the terminals are gathered on the center ring 12 to fix the discharger 30; the other group is four second cantilevers 14, the head ends of the second cantilevers 14 are connected with the fixing ring 11, a gap is arranged between the terminal and the center ring 12, and the terminals of the four second cantilevers 14 are respectively provided with a small hole for fixing the compression piston 20.

The cantilever sets are arranged in a central symmetry mode by taking the axis of the central ring 12 as an axis. The first cantilevers 13 and the second cantilevers 14 are alternately arranged on the fixing ring 11, that is, the first cantilevers 13 are arranged at intervals, and the second cantilevers 14 are arranged at the intervals, so that the plate spring 10 is prevented from locally and intensively bearing the force of the compression spring or the ejector 30, and the stress position of the plate spring 10 is relatively uniform.

The plurality of first cantilevers 13 and the plurality of second cantilevers 14 are respectively and uniformly disposed on the inner wall of the fixing ring 11. Therefore, the force born by the plate spring 10 can be relatively dispersed, and the vibration of the whole linear compressor caused by the vibration generated by the local plate spring 10 is reduced.

The first suspension arm 13 and the second suspension arm 14 are both arc-shaped suspension arms. Therefore, the lengths of the first cantilever 13 and the second cantilever 14 can be prolonged, so that when the plate spring 10 is deformed, the first cantilever 13 and the second cantilever 14 are relieved, and the impact on the plate spring 10 is reduced.

The first suspension arm 13 and the second suspension arm 14 are both elastic structures, and the ejector 30 is fixed on the central ring 12 of the plate spring 10 through a connecting rod 31 and moves together with the first suspension arm 13. The second suspension arm 14 may be used to support the compression piston 20 such that the compression piston 20 moves with the second suspension arm 14.

As shown in fig. 2, the ejector 30 and the compression piston 20 have a phase difference such that their forces applied to the plate spring 10 are not simultaneously offset to some extent, thereby reducing the vibration of the entire machine. This disclosure can effectively reduce the consumptive material in the production and processing process owing to unite two into one compression piston 20 and ejector 30's leaf spring 10, reduces linear compressor's manufacturing cost.

As shown in fig. 2 to 4, the disclosed embodiment provides a linear compressor for a stirling cooler, including a housing 40, a compression piston 20, an annular silicon steel sheet 50, an ejector 30, and a plate spring 10 as above.

The housing 40 is connected to the outer wall of the fixed ring 11 of the plate spring 10.

The compression piston 20 is connected with the second cantilever 14 of the plate spring 10; the middle part of the annular silicon steel sheet 50 is provided with a through groove, the compression piston 20 is installed in the through groove, and the annular silicon steel sheet 50 generates ampere force in a power-on state and is used for driving the compression piston 20 to move in a reciprocating manner.

The ejector 30 includes a connecting rod 31, and the connecting rod 31 is connected to the center ring 12 of the plate spring 10 through the compression piston 20.

It can be understood that the compression piston 20 and the ejector 30 can both reciprocate linearly, the compression piston 20, the ejector 30 and the surrounding heat exchange structure housing 40 together form a compression chamber 42, the working medium makes sinusoidal motion in the compression chamber 42, and enters the cold-end heat exchanger through the outer heat exchanger, the regenerator and the like, and finally expands in the expansion chamber 41. The compression piston 20 is actively moved by the permanent magnet under the action of the electrified silicon steel sheet, and the ejector 30 is passively moved by the combined action of the gas in the compression chamber 42 and the gas in the expansion chamber 41.

With the linear compressor for a stirling cooler provided in the embodiment of the present disclosure, the plate spring 10 may support the compression piston 20 and the ejector 30 of the linear compressor at the same time, and since the ejector 30 and the compression piston 20 have a phase difference, the forces applied to the plate spring 10 by the ejector 30 and the compression piston are not the same, and may cancel each other to some extent, thereby reducing the vibration of the entire machine. This disclosure can effectively reduce the consumptive material in the production and processing process owing to unite two into one compression piston 20 and ejector 30's leaf spring 10, reduces linear compressor's manufacturing cost.

Optionally, the linear compressor further comprises a first support 60, the first support 60 comprising a connecting structure 61, a first end of the connecting structure 61 being connected with the compression piston 20, and a second end being connected with the second cantilever 14.

It will be appreciated that the compression piston 20 is connected to the second cantilever 14 of the leaf spring 10 via the connecting structure 61 of the first support 60.

Optionally, a first guide hole 51 is formed in the annular silicon steel sheet 50, and an extending direction of the first guide hole 51 is the same as that of the compression piston 20; the first support 60 is provided with a guide arm 62, the guide arm 62 is connected to the outer periphery of the connecting structure 61, and the guide arm 62 is movable within the first guide hole 51.

It can be understood that a guide structure is provided in the ring-shaped silicon steel sheet 50 for guiding the movement of the first supporter 60 and the compression piston 20.

Optionally, the linear compressor further includes a second support 70, the second support 70 is connected to the annular silicon steel sheet 50, the second support 70 is of an annular structure, a hollow center of the second support 70 is used for guiding the compression piston 20, a second guide hole 71 is disposed in the second support 70, the second guide hole 71 corresponds to the first guide hole 51, and the second guide hole 71 is used for guiding the guide arm 62 of the first support 60.

It can be understood that the second supporter 70 serves to fix the silicon steel sheet 11 on one hand and to guide the compression piston 20 and the first supporter 60 on the other hand.

The linear compressor of the present disclosure will be described with reference to fig. 1 to 4.

The embodiment of the present disclosure provides a linear compressor for a stirling cooler, including a housing 40, a compression piston 20, an annular silicon steel sheet 50, an ejector 30, the plate spring 10 as above, a first support 60, and a second support 70.

The housing 40 is coupled to an outer wall of the fixed ring 11 of the plate spring 10, and the ejector 30 includes a connecting rod 31, the connecting rod 31 is coupled to the center ring 12 of the plate spring 10 through the compression piston 20, and the compression piston 20 is coupled to the second cantilever 14 of the plate spring 10. The middle part of the annular silicon steel sheet 50 is provided with a through groove, the compression piston 20 is arranged in the through groove, and the annular silicon steel sheet 50 generates ampere force in a power-on state and is used for driving the compression piston 20 to move back and forth.

The first supporter 60 includes a connection structure 61 and a guide arm 62, the connection structure 61 having a first end connected to the compression piston 20 and a second end connected to the second suspension arm 14, and the guide arm 62 connected to an outer circumference of the connection structure 61.

A first guide hole 51 is formed in the annular silicon steel sheet 50, and the extending direction of the first guide hole 51 is the same as the extending direction of the compression piston 20; the guide arm 62 of the first support 60 is movable within the first guide hole 51.

The second support member 70 has a ring-shaped structure, a hollow center is formed in a middle portion thereof for guiding the compression piston 20, a second guide hole 71 is formed in the second support member 70, the second guide hole 71 corresponds to the first guide hole 51, and the second guide hole 71 is formed for guiding the guide arm 62 of the first support member 60.

The expansion chamber 41 and the compression chamber 42 of the linear compression device are filled with gas working medium. While the ejector 30 and the compression piston 20 keep phase difference motion, the gas working medium in the working space performs reverse Stirling cycle, and four processes of isothermal compression, constant volume heat release, isothermal expansion and constant volume heat absorption are sequentially performed to form thermodynamic cycle. After the gas working medium is compressed and heat dissipation is completed, the gas working medium is expanded at a medium temperature in the expansion cavity 41 to absorb heat, and refrigeration is realized.

Since the ejector 30 and the compression piston 20 have a phase difference, the forces applied to the leaf spring 10 by the ejector and the compression piston are not the same, and they can be offset to some extent, thereby reducing the vibration of the entire machine.

In addition, the plate spring 10 of the compression piston 20 and the ejector 30 is combined into a whole, so that the material consumption and the compression production cost can be effectively reduced in the production and processing process.

The above description and the drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The embodiments of the present disclosure are not limited to the structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (10)

1. A plate spring for a stirling cooler, comprising:

a fixed ring (11), the outer wall of which is used for connecting with a shell (40) of the compressor;

the central ring (12) is positioned on the inner side of the fixing ring (11), and the inner side wall of the central ring (12) is provided with a fixing screw hole which is used for being connected with an ejector (30);

the cantilever group comprises a plurality of first cantilevers (13) and a plurality of second cantilevers (14), the first cantilevers (13) are connected with the fixing ring (11) and the central ring (12), the second cantilevers (14) are connected with the fixing ring (11), a gap is arranged between the second cantilevers (14) and the central ring (12), and the second cantilevers (14) are used for being connected with a compression piston (20); the first cantilever (13) and the second cantilever (14) are both elastic structures.

2. The leaf spring according to claim 1,

one end of the second cantilever (14) close to the central ring (12) is provided with a connecting hole which is used for being connected with the compression piston (20).

3. The leaf spring according to claim 1,

the first cantilevers (13) and the second cantilevers (14) are arranged on the fixing ring (11) in an alternating manner.

4. The leaf spring according to claim 3,

the first cantilevers (13) and the second cantilevers (14) are evenly arranged on the inner wall of the fixing ring (11) respectively.

5. The leaf spring according to any one of claims 1 to 4,

the cantilever sets are arranged in a centrosymmetric manner by taking the axis of the central ring (12) as an axis.

6. The leaf spring according to claim 5,

the first cantilever (13) and the second cantilever (14) are both arc-shaped cantilevers.

7. A linear compressor for a stirling cooler, comprising:

the leaf spring of any one of claims 1 to 6;

a housing (40) connected to an outer wall of the fixing ring (11) of the plate spring (10);

a compression piston (20) connected to the second cantilever arm (14) of the leaf spring (10);

the compression piston (20) is arranged in the through groove, and the annular silicon steel sheet (50) generates ampere force in a power-on state and is used for driving the compression piston (20) to move in a reciprocating manner;

-an ejector (30) comprising a connecting rod (31), said connecting rod (31) being connected with the central ring (12) of the leaf spring (10) through the compression piston (20).

8. The linear compressor of claim 7, further comprising:

a first support (60) comprising a connecting structure (61), the connecting structure (61) having a first end connected to the compression piston (20) and a second end connected to the second suspension arm (14).

9. Linear compressor according to claim 8,

a first guide hole (51) is formed in the annular silicon steel sheet (50), and the extending direction of the first guide hole (51) is the same as the extending direction of the compression piston (20);

the first support member (60) is provided with a guide arm (62), the guide arm (62) is connected with the periphery of the connecting structure (61), and the guide arm (62) can move in the first guide hole (51).

10. The linear compressor of claim 9, further comprising:

the second support piece (70) is connected with the annular silicon steel sheet (50), the second support piece (70) is of an annular structure, a hollow center in the middle of the second support piece (70) is used for guiding the compression piston (20), a second guide hole (71) is formed in the second support piece (70), the second guide hole (71) corresponds to the first guide hole (51), and the second guide hole (71) is used for guiding a guide arm (62) of the first support piece (60).

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