CN220849958U - Linear compressor and linear Stirling refrigerator - Google Patents

Abstract

The utility model relates to the technical field of linear compressors, and provides a linear compressor which comprises a cylinder seat and a cylindrical inner magnetic yoke, wherein the cylinder seat comprises a base and a cylinder body extending outwards from the end part of the base, the inner magnetic yoke is sleeved on the cylinder body, one end of the inner magnetic yoke is blocked on the cylinder seat, and the other end of the inner magnetic yoke is locked and fixed through an axial fastening structure. A linear Stirling refrigerator is also provided, comprising an expander and the linear compressor. The inner magnetic yoke is fixed on the cylinder seat in a locking way through the axial fastening structure, the inner magnetic yoke and the cylinder seat can be reliably fixed, the glue consumption of the compressor can be reduced by adopting the mechanical structure for fixing, so that the gas pollution in the refrigerator is reduced, and in addition, the structure fully utilizes the axial and radial space of the cylinder seat, thereby realizing the lightweight design of the compressor.

Description

Linear compressor and linear Stirling refrigerator

Technical Field

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

Background

The linear compressor is used as a core component of the Stirling refrigerator and is a power source for maintaining normal flow of working medium.

In the prior art, the inner magnetic yoke and the cylinder seat are usually fixed by adopting a laser welding or adhesive mode, but as the inner magnetic yoke is made of a magnetic conduction material and the cylinder seat is made of a non-magnetic conduction material, cracks can be generated when the inner magnetic yoke and the cylinder seat are welded by adopting laser, so that welding reliability is deteriorated; if glue is adopted for bonding, impurity gas can be gradually released and gradually gathered in a silk screen at the cold end of the expander in the long-term running process of the refrigerator, the silk screen is blocked, the performance of the refrigerator can be obviously attenuated, and even the situation that the temperature of the refrigerator is not reached and the detector cannot work normally is caused.

Disclosure of utility model

The utility model aims to provide a linear compressor and a linear Stirling refrigerator, which can at least solve part of defects in the prior art.

In order to achieve the above object, the embodiment of the present utility model provides the following technical solutions: the utility model provides a linear compressor, includes the cylinder block and is the interior yoke of tube-shape, the cylinder block include the base and from the outside cylinder body that extends of base tip, interior yoke cover is established on the cylinder body, the one end of interior yoke block in on the cylinder block, the other end passes through axial fastening structure locking and is fixed.

Further, a step is arranged at the joint of the base and the cylinder body, and one end of the inner magnetic yoke is blocked on the step.

Further, a backing ring is arranged between the inner magnetic yoke and the step.

Further, a clamping groove for embedding the backing ring is formed in the end face of the inner magnetic yoke and/or the step face of the step.

Further, one axial end face of the backing ring protrudes outwards to form a protruding part, and the protruding part is embedded into the clamping groove.

Further, the axial fastening structure includes a locking member for axially locking the inner yoke to the cylinder block.

Further, the locking piece comprises a locking nut which is in threaded connection with the cylinder seat, and the locking nut is abutted against the end face of the inner magnetic yoke.

Further, the lock nut comprises a threaded column with internal threads and a locking ring sleeved on the outer wall of the threaded column, the threaded column is in threaded connection with the cylinder seat, and the locking ring is abutted against the end face of the inner magnetic yoke.

Further, after the lock nut is in threaded connection with the cylinder seat, the outer surface of the lock nut is flush with part of the end face of the inner magnetic yoke.

The embodiment of the utility model provides another technical scheme that: a linear Stirling refrigerator comprises an expander and the linear compressor.

Compared with the prior art, the utility model has the beneficial effects that: one end of the inner magnetic yoke is blocked on the cylinder seat, the other end of the inner magnetic yoke is locked and fixed through the axial fastening structure, the inner magnetic yoke and the cylinder seat can be reliably fixed, the glue consumption of the compressor can be reduced by adopting the mechanical structure, so that the gas pollution in the refrigerator is reduced, and in addition, the structure fully utilizes the axial and radial space of the cylinder seat, and the lightweight design of the compressor is realized.

Drawings

Fig. 1 is a schematic cross-sectional view of a linear compressor according to an embodiment of the present utility model;

fig. 2 is an assembly schematic diagram of an inner yoke and a cylinder block of a linear compressor according to an embodiment of the present utility model;

FIG. 3 is an exploded view of FIG. 2 (shown at different angles);

In the reference numerals:

1-a cylinder block; 10-thread grooves; 11-a cylinder; 12-a base;

2-an inner yoke;

30-a stator framework; 31-coil; 32-an outer yoke;

40-plate spring; 41-magnetic steel; 42-a piston; 43-magnetic steel skeleton;

50-backing rings;

60-locking nut.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1, 2 and 3, an embodiment of the present utility model provides a linear compressor, which includes a cylinder block 1 and a cylindrical inner yoke 2, wherein the cylinder block 1 includes a base 12 and a cylinder body 11 extending outwards from an end of the base 12, one end of the inner yoke 2 is blocked on the cylinder block 1, and the other end is locked and fixed by an axial fastening structure. As shown in fig. 3, there may be two cylinders 11, two cylinders 11 stretch out towards both ends about, and two inner yokes 2 can overlap respectively on two cylinders 11, and the one end of inner yokes 2 stops on cylinder block 1, can restrict the radial displacement of inner yokes 2, and rethread axial fastening structure locking is fixed, can restrict the displacement of inner yokes 2 in the axial, can ensure the stable position of inner yokes 2.

Specifically, referring to fig. 1, a step is provided at the connection between the base 12 and the cylinder 11, and one end of the inner yoke 2 is blocked on the step. A step is formed at the base 12 and the cylinder 11, and one end of the inner yoke 2 can be stopped on the step. When the cylinder 11 is a cylinder, the step is an annular step.

Referring to fig. 1, in order to enhance the axial limiting effect, a backing ring 50 may be disposed between the inner yoke 2 and the step. The backing ring 50 may be made of a rubber material having a friction force, and has an anti-slip effect when it is pressed between the step and the inner yoke 2, thereby being capable of restricting displacement of the inner yoke 2 in the axial direction. Of course, other shapes of slip-resistant sheets, or other shapes of snap-in forms are possible without the grommet 50 and without the annular slip-resistant member, as long as a certain blocking force is provided.

With reference to fig. 1, with the above backing ring 50 in detail, one axial end surface of the backing ring 50 protrudes outwards to form a protruding portion, and a clamping groove into which the backing ring 50 is embedded is formed on the end surface of the inner yoke 2 and/or the step surface of the step, and the protruding portion is embedded into the clamping groove. When the backing ring 50 is embedded into the clamping groove, a better anti-skid effect can be achieved. The shape of the cushion ring 50 after protruding can be conical, for example, a triangular prism is enclosed to form an annular structure, the section of a certain section can be triangular, and the cushion ring 50 in the form has a good limiting effect. Of course square or another shape is possible. .

Referring to fig. 1,2 and 3, there are two steps, two steps are arranged at intervals along the radial direction, and each step is provided with the backing ring 50. In the present embodiment, one backing ring 50 is designed for each step, while in other embodiments, more backing rings 50 are designed for each step, such as a greater number of backing rings 50 along the axial direction, to achieve a better stop effect.

With the above axial fastening structure being further refined, referring to fig. 1, 2 and 3, the inner yoke 2 may be axially locked on the cylinder seat 1 by using a locking member, where the locking direction is axial, so as to play a role in limiting the axial displacement of the inner yoke 2.

With further optimization of the above scheme, referring to fig. 1 and 2, the locking member includes a locking nut 60, the locking nut 60 is screwed on the cylinder seat 1, and the locking nut 60 abuts against the end face of the inner yoke 2. The locking member may be a locking nut 60 for locking the inner yoke 2 to the cylinder block 1 by means of a screw connection. Of course, the fastening may be performed by a snap-fit manner, in addition to the fastening manner by the lock nut 60.

Further optimizing the lock nut 60, referring to fig. 1 and 2, the lock nut 60 includes a threaded post with internal threads and a locking ring sleeved on the outer wall of the threaded post 61, the threaded post 61 is screwed on the cylinder seat, the locking ring abuts against the end face of the inner yoke, the cylinder seat 1 can be designed with a thread groove 10 into which the threaded post 61 is screwed, and then the locking ring can lock the inner yoke 2 on the cylinder seat 1.

Referring to fig. 1, after the lock nut is screwed on the cylinder seat, an outer surface of the lock nut is flush with a part of an end surface of the inner yoke. Specifically, the inner rings at the two ends of the inner yoke 2 are recessed to form recessed parts, the lock nut is embedded into the recessed parts at one end of the inner yoke to enable the outer surface of the lock nut to be flush with the end face of the outer ring of the inner yoke 2, and the recessed parts at the other end of the inner yoke 2 are matched with the steps, so that the lock nut at the two ends of the inner yoke 2 and the steps do not occupy additional space, and the volume of the compressor is reduced.

As an optimization scheme of the embodiment of the present utility model, referring to fig. 1, 2 and 3, the linear compressor further has a stator assembly and a rotor assembly, wherein the stator assembly includes a stator frame 30, a coil 31 and an outer yoke 32, one end of the stator frame 30 is fixed on the cylinder block 1, the other end is fixed with an end cover of the compressor, and the coil 31 and the outer yoke 32 are fixed on the stator frame 30. The rotor component comprises a plate spring 40, magnetic steel 41, a piston 42 and a magnetic steel framework 43, wherein the rotor component is fixed on the stator framework 30 by an outer ring screw of the plate spring 40, and the stator component is fixed on the cylinder seat 1 after the process is finished, so that the assembly of the compressor can be finished. The stator component and the rotor component are provided with two sets of inner yokes 2 respectively.

The embodiment of the utility model provides a linear Stirling refrigerator, which comprises an expander and the linear compressor, wherein pressure waves generated by the linear compressor are sent to the expander. In the embodiment, the linear compressor is used in a linear Stirling refrigerator, one end of the inner magnetic yoke is blocked on the cylinder seat, the other end of the inner magnetic yoke is locked and fixed through the axial fastening structure, the inner magnetic yoke and the cylinder seat can be reliably fixed, the mode of adopting this mechanical structure fixes, can reduce the glue quantity of compressor to alleviate the gas pollution in the refrigerator, this structure has also fully utilized the axial and radial space of cylinder block in addition, has realized the lightweight design of compressor.

The working principle of the linear compressor and the expander is as follows: the outer yoke 32, the coil 31, the magnetic steel 41 and the inner yoke 2 form a linear motor part which is a power source of a linear compressor, the magnetic steel framework 43, the leaf spring 40 and the piston 42 are driven by a sinusoidal alternating current power supply to perform reciprocating displacement motion together, a pressure wave is generated for working gas to compress a gas working medium, and finally the working gas is conveyed to an expander through an air outlet nozzle to generate a refrigerating effect.

As an optimization scheme of the embodiment of the utility model, the compressor completely adopts an axisymmetric opposite structure, so that forces generated by the reciprocating motion of the two sets of piston 42 assemblies are always equal in magnitude and opposite in direction, and thus the forces are mutually offset, and vibration and noise during the operation of the compressor can be reduced.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. The utility model provides a linear compressor, includes cylinder block and is the interior yoke of tube-shape, the cylinder block includes the base and from the cylinder body of base tip outwards extension, its characterized in that: the inner magnetic yoke is sleeved on the cylinder body, one end of the inner magnetic yoke is blocked on the cylinder seat, and the other end of the inner magnetic yoke is locked and fixed through the axial fastening structure.

2. The linear compressor of claim 1, wherein: the junction of base and cylinder body is equipped with the step, the one end of inner yoke keeps off in on the step.

3. The linear compressor of claim 2, wherein: and a backing ring is arranged between the inner magnetic yoke and the step.

4. A linear compressor as claimed in claim 3, wherein: the end face of the inner magnetic yoke and/or the step face of the step are provided with clamping grooves for embedding the backing ring.

5. The linear compressor of claim 4, wherein: one axial end surface of the backing ring protrudes outwards to form a protruding part, and the protruding part is embedded into the clamping groove.

6. The linear compressor of any one of claims 1-5, wherein: the axial securing structure includes a locking member for axially locking the inner yoke to the cylinder block.

7. The linear compressor of claim 6, wherein: the locking piece comprises a locking nut which is in threaded connection with the cylinder seat, and the locking nut is abutted against the end face of the inner magnetic yoke.

8. The linear compressor of claim 7, wherein: the locking nut comprises a threaded column with internal threads and a locking ring sleeved on the outer wall of the threaded column, the threaded column is in threaded connection with the cylinder seat, and the locking ring is abutted against the end face of the inner magnetic yoke.

9. The linear compressor of claim 7, wherein: after the lock nut is in threaded connection with the cylinder seat, the outer surface of the lock nut is flush with part of the end surface of the inner magnetic yoke.

10. A linear stirling cooler comprising an expander, characterized in that: further comprising a linear compressor as claimed in any one of claims 1 to 9.