CN115750269A - Linear compressor and refrigerator - Google Patents

Abstract

The present invention relates to a linear compressor and a refrigerator, including: a cylinder block; a compression piston disposed within the cylinder block; the permanent magnet is arranged in the compression piston, and the outer wall surface of the permanent magnet is attached to the inner wall surface of the compression piston; a stator coil provided outside the cylinder block; and the end cover is connected with the end face of the cylinder seat to form an internal closed cavity for filling refrigerant gas. According to the linear compressor, the permanent magnet and the internal soft magnet are both arranged in the compression piston, and the stator coil and the external soft magnet are arranged outside the cylinder block, so that the linear compressor is more compact in overall structure and lighter in weight.

Description

Linear compressor and refrigerator

Technical Field

The invention relates to the technical field of Stirling refrigerators, in particular to a linear compressor and a refrigerator.

Background

In the design of the existing Stirling refrigerator, a linear compressor is mostly used as a core component. Further, linear compressor's motor start structure includes stator structure and active cell structure, and outer soft magnetism and coil among the stator structure are fixed on stator frame, and stator frame rewelds on the cylinder block, and the permanent magnet among the active cell structure is fixed on the magnet steel frame, and the magnet steel frame is fixed with the compression piston again, and the drive power that the rethread permanent magnet produced on the axial direction drives the compression piston and is reciprocating motion.

However, the above structural design is complex, two parts of the stator framework and the magnetic steel framework need to be designed, so that the assembly steps are complex, the assembly precision is difficult to guarantee, and further, the existence of the stator framework and the magnetic steel framework enables the linear compressor not to reasonably utilize the radial space inside the compressor, so that the radial size cannot be further reduced, and the weight of the compressor cannot be reduced.

Disclosure of Invention

The invention aims to provide a linear compressor and a refrigerator, wherein a permanent magnet and an internal soft magnet are both arranged in a compression piston, and a stator coil and an external soft magnet are arranged outside a cylinder seat, so that the overall structure of the linear compressor is more compact and the linear compressor is lighter.

In order to achieve the purpose, the invention provides the following technical scheme:

there is provided a linear compressor, including:

a cylinder block;

a compression piston disposed within the cylinder block;

the permanent magnet is arranged in the compression piston, and the outer wall surface of the permanent magnet is attached to the inner wall surface of the compression piston;

and a stator coil provided outside the cylinder block.

Preferably, the linear compressor further comprises: and the internal soft magnet is arranged in the compression piston, and the outer wall surface of the internal soft magnet is attached to the inner wall surface of the permanent magnet.

Preferably, an accommodating cavity is formed in the inner soft magnet, and the permanent magnet is accommodated in the accommodating cavity.

Preferably, the linear compressor further comprises: the external soft magnet is fixed outside the cylinder block and wraps all/part of the stator coil;

and the fins are arranged on the outer wall surface of the cylinder block, and the outer soft magnet and/or the stator coil are fixed with the cylinder block through the fins.

Preferably, the linear compressor further comprises: and part/all of the axial limiting piece is positioned in the compression piston, one end of the permanent magnet is abutted against the inner wall of the compression piston, and the other end of the permanent magnet is abutted against the axial limiting piece.

Preferably, the linear compressor further comprises: and the radial support piece is respectively connected with the axial limiting piece and the cylinder block, so that the compression piston is in clearance fit with the cylinder block.

Preferably, the linear compressor further includes: and the end cover is connected with the end face of the cylinder seat to form an internal closed chamber for filling refrigerant gas.

Preferably, the cylinder block includes:

the compression piston is arranged in the cylinder;

a base body connected to one end of the cylinder;

and an extension section connected to the other end of the cylinder and having an inner installation space.

Preferably, the base main body, the extension section and the cylinder are integrally formed.

In another aspect, a refrigerator is also provided, which comprises the linear compressor.

A refrigerator is also provided, which comprises the linear compressor.

In conclusion, compared with the prior art, the invention has the following beneficial effects:

the permanent magnet and the internal soft magnet are both arranged in the compression piston, so that a stator framework for fixing the stator coil and a magnetic steel framework for fixing the rotor permanent magnet in the conventional linear compressor are omitted, and the stator coil and the external soft magnet are arranged outside the cylinder block, so that the volume of the cylinder block can be greatly reduced, the integral structure of the linear compressor is more compact, and the weight is lighter. Meanwhile, the magnetic field generated by the stator coil is closer to the permanent magnet, so that the working efficiency of the linear compressor can be improved.

Drawings

Fig. 1 is an overall longitudinal sectional view of a linear compressor in embodiment 1 of the present invention.

Fig. 2 is a partial longitudinal sectional view of a linear compressor in embodiment 3 of the present invention.

Fig. 3 is a longitudinal sectional view of a cylinder block in embodiment 5 of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.

Example 1:

as shown in fig. 1, the present embodiment discloses a linear compressor suitable for a linear stirling cooler, and the linear compressor includes, but is not limited to, an opposed compressor, and specifically, the linear compressor includes:

a cylinder block 5 having a hollow interior;

a compression piston 6 which is provided in the cylinder block 5 and has a hollow interior; in this embodiment, the compression piston 6 and the cylinder block 5 are coaxially arranged, and a gap smaller than or equal to 10 μm is formed between the compression piston 6 and the inner wall surface of the cylinder block 5, so that the compression piston 6 can linearly reciprocate in the cylinder block 5 along the axial direction Y;

a permanent magnet 7 which is disposed inside the compression piston 6 and has an outer wall surface attached to an inner wall surface of the compression piston 6; for example, in the present embodiment, the permanent magnet 7 may be attached to the inner wall surface of the compression piston 6 by an adhesive or the like;

the internal soft magnet 8 is arranged in the compression piston 6, and the outer wall surface of the internal soft magnet is attached to the inner wall surface of the permanent magnet 7;

a stator coil 9 provided outside the cylinder block 5;

an external soft magnet 10 provided outside the cylinder block 5;

and the end cover 3 is fixedly connected with the end face of the cylinder block 5 in a welding mode and the like so as to form an internal closed chamber 100 for filling refrigerant gas.

In this embodiment, the inner soft magnet 8 and/or the outer soft magnet 10 may be made of a low magnetic resistance material, such as a silicon steel sheet, pure iron, or the like, so that an excitation magnetic field generated after the coil is energized can be effectively collected, and the motor efficiency is improved.

When the linear refrigerating machine works, the permanent magnet 7 generates periodic electromagnetic force under the alternating excitation magnetic steel of the stator coil 9 to drive the compression piston 6 to do periodic reciprocating motion in the cylinder seat 5 along the axial direction Y and compress working medium gas to form periodic pressure waves, and the periodic pressure waves are further transmitted to an expander of the linear refrigerating machine to form a refrigerating effect.

Therefore, in the embodiment, the permanent magnet 7 and the internal soft magnet 8 are both arranged in the compression piston 6, so that a stator framework for fixing the stator coil and a magnetic steel framework for fixing the rotor permanent magnet in the existing linear compressor are omitted, the number of parts of the linear compressor is reduced, the structure of the linear compressor is more compact, the weight is lighter, meanwhile, the arrangement of the stator framework and the magnetic steel framework is reduced in the radial direction, the magnetic field generated by the stator coil 9 is closer to the permanent magnet 7, and the working efficiency of the linear compressor is further improved.

Example 2:

the present embodiment is different from embodiment 1 only in that, in the present embodiment, the linear compressor further includes: the fin 11 is an independent part and is connected with the outer wall surface of the cylinder seat 5, or the fin 11 and the cylinder seat 5 are of an integral structure and are formed by extending the outer wall surface of the cylinder seat 5 outwards; further, the stator coil 9 and the external soft magnet 10 are both connected with the fins 11, and the external soft magnet 10 wraps all/part of the stator coil 9 to collect magnetic flux.

Therefore, the stator coil 9 and the external soft magnet 10 in the embodiment are both connected with the fin 11 positioned outside the cylinder block 5, and the two are not required to be fixed on the stator framework, so that the volume of the cylinder block 5 can be further reduced, and the whole structure of the linear compressor is more compact.

Example 3:

the difference between this embodiment and embodiment 1 or 2 is only that, as shown in fig. 2, an accommodating cavity is opened on the inner soft magnet 8, and the permanent magnet 7 is completely accommodated in the accommodating cavity, so that the inner soft magnet 8 completely wraps the permanent magnet 7 from the periphery, and the magnetic flux gathering effect is better.

Example 4:

the present embodiment is different from any one of embodiments 1 to 3 only in that the linear compressor further includes:

the axial limiting piece 1 is partially/completely positioned inside the compression piston 6, and is abutted against the end part of the permanent magnet 7 and/or the inner soft magnet 8 in the axial direction, so as to prevent the permanent magnet 7 and the inner soft magnet 8 from moving in the axial direction Y, so that the structure is stable, and the normal operation of the motor is guaranteed;

the radial support part 2 is respectively connected with the axial limiting part 1 and the cylinder block 5, so that the compression piston 6 is in clearance fit with the cylinder block 5 to prevent friction;

during operation, the axial extensible member 2 can generate axial telescopic motion, and the permanent magnet 7 drives the axial limiting member 1 and the compression piston 6 to move in the axial direction Y.

Preferably, the axial expansion member 2 comprises a plate spring, and the radially outer edge of the plate spring is connected to the cylinder block 5 by a fastening member 4 (e.g., a screw/bolt), etc., and the radially outer edge can still generate an axial expansion movement even though the radially outer edge is fixed according to the structural characteristics of the plate spring.

Example 5:

this embodiment differs from embodiment 4 only in that, as shown in fig. 3, the cylinder block 5 includes:

a cylinder 51, and the compression piston 6 is disposed inside the cylinder 51;

a base body 52 connected to one end of the cylinder 51;

and an extension 53 connected to the other end of the cylinder 51 and having an inner installation space 531;

the end cover 3 is fixedly connected with the end face of the extending section 53 by welding or the like, the radial support 2 is located in the inner mounting space 531, and part/all of the cylinder 51 and part/all of the axial limiting member 1 are located in the inner mounting space 531;

preferably, the base body 52, the extension 53 and the cylinder 51 are integrally formed.

Therefore, in the embodiment, the extending section 53 can provide an installation space for the end cover 3 and the radial support member 2 to replace a partial structure of the stator framework in the prior art, so that the whole structure is more compact and reasonable.

Example 6:

this embodiment provides a refrigerator comprising the linear compressor of any one of embodiments 1 to 5, in particular a linear refrigerator, in particular a linear stirling refrigerator.

In conclusion, the linear compressor is simple in structure and assembly, the permanent magnets and the internal soft magnets are both arranged inside the compression piston, so that a stator framework for fixing the stator coils and a magnetic steel framework for fixing the rotor permanent magnets in the conventional linear compressor are omitted, and the stator coils and the external soft magnets are arranged outside the cylinder block, so that the volume of the cylinder block can be greatly reduced, and the linear compressor is more compact in overall structure and lighter in weight.

Furthermore, the structural design of the invention can enable the magnetic field generated by the stator coil to be closer to the permanent magnet, thereby further improving the working efficiency of the linear compressor.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.

Claims (10)

1. A linear compressor, comprising:

a cylinder block;

a compression piston disposed within the cylinder block;

the permanent magnet is arranged in the compression piston, and the outer wall surface of the permanent magnet is attached to the inner wall surface of the compression piston;

and a stator coil provided outside the cylinder block.

2. The linear compressor as set forth in claim 1, further comprising: and the internal soft magnet is arranged in the compression piston, and the outer wall surface of the internal soft magnet is attached to the inner wall surface of the permanent magnet.

3. The linear compressor as claimed in claim 2, wherein the inner soft magnet is provided with a receiving cavity, and the permanent magnet is received in the receiving cavity.

4. The linear compressor as set forth in claim 1, further comprising: the external soft magnet is fixed outside the cylinder block and wraps all/part of the stator coil;

and the fins are arranged on the outer wall surface of the cylinder block, and the outer soft magnet and/or the stator coil are fixed with the cylinder block through the fins.

5. The linear compressor of claim 1, further comprising: and part/all of the axial limiting piece is positioned in the compression piston, one end of the permanent magnet is abutted against the inner wall of the compression piston, and the other end of the permanent magnet is abutted against the axial limiting piece.

6. The linear compressor as set forth in claim 5, further comprising: and the radial support piece is respectively connected with the axial limiting piece and the cylinder block, so that the compression piston is in clearance fit with the cylinder block.

7. The linear compressor as set forth in claim 1, further comprising: and the end cover is connected with the end face of the cylinder seat to form an internal closed chamber for filling refrigerant gas.

8. The linear compressor of claim 1, wherein the cylinder block comprises:

the compression piston is arranged in the cylinder;

a base body connected to one end of the cylinder;

and an extension section connected to the other end of the cylinder and having an inner installation space.

9. The linear compressor of claim 8, wherein the base body, the extension section, and the cylinder are integrally formed.

10. A refrigerator comprising a linear compressor according to any one of claims 1 to 9.

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