CN213627896U - Linear compressor and linear Stirling refrigerator - Google Patents

Abstract

The utility model relates to a linear compressor and a linear Stirling refrigerator adopting the linear compressor; in the linear compressor, a piston of a cylinder assembly is provided with a piston main body arranged in a cylinder body in a sliding mode and a driving arm which is positioned outside the cylinder body and is fixedly provided with a permanent magnet, the linear motor comprises an outer stator yoke iron fixed in a shell of the compressor and an inner rotor yoke iron accommodated in an annular space between the driving arm and the cylinder body, and a cutting groove used for cutting off a yoke iron eddy current path is formed in the surface of the outer stator yoke iron and/or the surface of the inner rotor yoke iron. The utility model discloses an outer stator and interior active cell set up the disconnect-type yoke structure of yoke respectively to the surface of outer stator yoke and/or the surface of interior active cell yoke are equipped with the cut groove in order to cut yoke vortex route, are guaranteeing the motor performance while showing the eddy current loss that has reduced the motor, thereby can promote the work efficiency of compressor, can realize the refrigeration performance of linear stirling refrigerator high COP, low energy consumption.

Description

Linear compressor and linear Stirling refrigerator

Technical Field

The utility model belongs to the technical field of the compressor, concretely relates to linear compressor and adopt this linear compressor's linear stirling refrigerator.

Background

The linear Stirling refrigerator is widely applied to civil and military equipment such as thermal infrared imagers, infrared foresight and night vision, missile guidance, space application and the like, and the linear compressor is used as a core component of the linear Stirling refrigerator, so that the linear Stirling refrigerator has a large influence on the reliable operation of the linear Stirling refrigerator.

In the existing linear Stirling refrigerator, a linear motor of a linear compressor generally adopts an integral magnetic yoke structure, so that eddy current is increased rapidly, iron loss is increased, and the working efficiency of the compressor is reduced. In addition, in the linear compressor, the permanent magnet is generally fixed on the external magnetic steel of the piston, the currently common fixing mode is glue bonding, the fixing mode is easy to produce and operate, but gas working medium pollution in the compressor can be caused, and the working stability and reliability of the compressor are influenced.

SUMMERY OF THE UTILITY MODEL

The utility model relates to a linear compressor and adopt this linear compressor's linear stirling refrigerator can solve prior art's partial defect at least.

The utility model relates to a linear compressor, including compressor housing, cylinder assembly and linear electric motor, the cylinder assembly includes cylinder body, piston and permanent magnet, the cylinder body is fixed in the compressor housing, the piston have the piston main part of locating in the cylinder body and connect in on the piston main part and lie in the actuating arm outside the cylinder body, the permanent magnet is fixed in on the actuating arm, linear electric motor includes outer stator yoke and interior active cell yoke, outer stator yoke is fixed in the compressor housing, interior active cell yoke accept by the actuating arm with the cylinder body encloses the annular space that establishes and form in; and the surface of the outer stator yoke and/or the surface of the inner rotor yoke are/is provided with a cutting groove for cutting off a yoke eddy current path.

In one embodiment, the cutting grooves are axial cutting grooves with the length direction parallel to the axial direction of the corresponding yoke.

As an embodiment, the permanent magnet is mounted on the driving arm by a mechanical fixing structure.

As one embodiment, the mechanical fixing structure includes a first engaging groove and a second engaging groove, the first engaging groove and the second engaging groove are both formed on the driving arm and have opposite notches, and two ends of the permanent magnet are respectively engaged with the first engaging groove and the second engaging groove.

In one embodiment, the driving arm is a magnetic steel arm body.

In one embodiment, one end of the piston body extends out of the cylinder and is sleeved with a plate spring, and the plate spring is fixed in the compressor shell.

As one embodiment, the two pistons are provided, and the sliding directions of the two piston bodies in the cylinder are opposite, and the linear motors are correspondingly arranged in two groups.

The utility model discloses still relate to a linear stirling refrigerator, including linear compressor, linear compressor adopts as above linear compressor.

The utility model discloses following beneficial effect has at least:

the utility model discloses an outer stator and interior active cell set up the disconnect-type yoke structure of yoke respectively to the surface of outer stator yoke and/or the surface of interior active cell yoke are equipped with the cut groove in order to cut yoke vortex route, are guaranteeing the motor performance while showing the eddy current loss that has reduced the motor, thereby can promote the work efficiency of compressor, can realize the refrigeration performance of linear stirling refrigerator high COP, low energy consumption.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a linear compressor according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of an outer stator yoke provided with a cut groove according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of an inner rotor yoke provided with a cutting groove according to an embodiment of the present invention;

fig. 4 is a schematic view of an installation structure of a permanent magnet on a driving arm according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention are described below clearly and completely, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Example one

As shown in fig. 1-3, an embodiment of the present invention provides a linear compressor, including a compressor housing 1, a cylinder assembly and a linear motor, where the cylinder assembly includes a cylinder 31, a piston and a permanent magnet 33, the cylinder 31 is fixed in the compressor housing 1, the piston has a piston main body 321 slidably disposed in the cylinder 31 and a driving arm 322 connected to the piston main body 321 and located outside the cylinder 31, the permanent magnet 33 is fixed on the driving arm 322, the linear motor includes an outer stator yoke 21 and an inner rotor yoke 23, the outer stator yoke 21 is fixed in the compressor housing 1, and the inner rotor yoke 23 is accommodated in an annular space defined by the driving arm 322 and the cylinder 31; the surface of the outer stator yoke 21 and/or the surface of the inner rotor yoke 23 are provided with cut grooves 24 for cutting off the yoke eddy current path.

As shown in fig. 1, the compressor casing 1 may have a structure in which one end is opened and a gland 11 is provided at the opened end.

The outer stator yoke 21 may be fixedly mounted on the inner wall of the compressor housing 1 or the cylinder 31 by a stator frame. The inner rotor yoke 23 may be fixed to the cylinder 31.

Similarly, the cylinder 31 is also preferably fixedly connected to the inner wall of the compressor housing 1. In the present embodiment, the compressor housing 1, the outer stator yoke 21, the cylinder 31, and the inner rotor yoke 23 are all of a gyroid structure and are coaxially arranged. Obviously, the piston main body 321 is arranged coaxially with the cylinder 31, the driving arm 322 is a generally annular arm and is coaxial with the piston main body 321, and the driving arm 322 is connected to one end of the piston main body 321 extending out of the cylinder 31; an annular space is defined between the annular driving arm 322 and the outer wall of the cylinder 31 for accommodating the inner rotor yoke 23, and in one embodiment, the inner rotor yoke 23 is fixed on the outer wall of the cylinder 31 in a sleeving manner.

The permanent magnet 33 can be driven to do linear motion (the linear motion direction is parallel to the axial direction of the piston main body 321) through the action of the outer stator, the current-carrying coil 22 accommodated in the outer stator and the inner rotor, so that the driving arm 322 and the piston main body 321 are driven to do linear motion, and the working conditions such as gas compression and the like are realized; this principle is common knowledge in the art and will not be described in detail here.

Alternatively, the driving arm 322 is a magnetic steel arm body. Unlike the conventional method of adhering and fixing the permanent magnet 33 to the magnetic steel, in the embodiment, as shown in fig. 4, the permanent magnet 33 is mounted on the driving arm 322 through a mechanical fixing structure. The permanent magnet 33 is fixedly installed in a mechanical fixing mode, so that the pollution of gas working media in the compressor caused by glue and the like can be avoided, and the purity of the gas working media is ensured, so that the working stability and the reliability of the compressor can be effectively improved. In one embodiment, as shown in fig. 4, the mechanical fixing structure includes a first locking groove and a second locking groove, the first locking groove and the second locking groove are both formed on the driving arm 322 and have opposite notches, and two ends of the permanent magnet 33 are respectively locked and embedded in the first locking groove and the second locking groove. The permanent magnet 33 is generally a ring magnet, and the first and second slots are preferably ring slots; of course, a plurality of card slot groups may be sequentially arranged along the circumferential direction of the driving arm 322, and each card slot group includes a first card slot and a second card slot which are oppositely arranged, so that the permanent magnet 33 can be reliably fixed.

As shown in fig. 4, one of the first and second slots may have a relatively shallow slot depth to facilitate the mounting and dismounting of the permanent magnet 33.

In the structure in which the driving arm 322 is a magnetic steel arm, the first engaging groove and the second engaging groove are also preferably magnetic steel engaging grooves. The first and second engaging grooves are preferably integrally formed on the driving arm 322, so that the structure is stable and reliable.

Of course, other mechanical fixing means are also applicable to the present embodiment, such as a snap-lock fixing means, a bolt fixing the pressing plate on the driving arm 322 and a pressing of the permanent magnet 33 by the pressing plate, etc., which are not exemplified here.

The linear compressor provided by the embodiment adopts the separated magnetic yoke structure that the outer stator and the inner rotor are respectively provided with the magnetic yokes, and the surface of the outer stator yoke 21 and/or the surface of the inner rotor yoke 23 are/is provided with the cutting grooves 24 to cut off the yoke eddy current path, so that the eddy current loss of the motor is remarkably reduced while the performance of the motor is ensured, the working efficiency of the compressor can be improved, and the refrigeration performance of the linear stirling refrigerator with high COP and low energy consumption can be realized.

Preferably, as shown in fig. 2 and 3, the surface of the outer stator yoke 21 and the surface of the inner rotor yoke 23 are both provided with cut grooves 24, so that the above-mentioned eddy current loss reduction effect is more significant; in particular, as shown in fig. 2 and 3, the axial slots 24 with the length direction parallel to the axial direction of the corresponding yoke are used for better application effect. The cut groove 24 may be provided only on the outer ring surface of the yoke, or both the outer ring surface and the inner ring surface of the yoke may be provided with the cut groove 24.

Further optimizing the linear compressor, as shown in fig. 1, one end of the piston main body 321 extends out of the cylinder 31 and is sleeved with a plate spring 4, and the plate spring 4 is fixed in the compressor housing 1. The support and position limitation of the piston body 321 by the plate spring 4 is a conventional structure in the art and will not be described in detail.

Further optimizing the linear compressor, as shown in fig. 1, the pistons are two and the sliding directions of the two piston bodies 321 in the cylinder 31 are opposite, and the linear motors are correspondingly configured into two groups; by adopting the structure that two groups of compression mechanisms are arranged oppositely, the two piston main bodies 321 can respectively do linear reciprocating motion to apply work to gas and generate pressure waves for compressing gas working media, and the forces generated by the reciprocating motion of the two piston main bodies 321 are always equal in magnitude and opposite in direction and can be mutually counteracted, thereby achieving the purpose of reducing or eliminating the vibration of the compressor.

Example two

The embodiment of the utility model provides a linear stirling refrigerator, including linear compressor, this linear compressor is preferred to adopt the linear compressor that above-mentioned embodiment one provided, and its concrete structure here is not repeated.

The structure of the refrigerator can adopt the structure of a conventional refrigerator, such as a dewar, an expander and the like, and the connection structure and the matching relationship among the dewar, the expander and the linear compressor are conventional technologies in the field, and are not described herein again.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. A linear compressor, comprising a compressor housing, a cylinder assembly and a linear motor, wherein the cylinder assembly comprises a cylinder body, a piston and a permanent magnet, the cylinder body is fixed in the compressor housing, the piston has a piston main body slidably disposed in the cylinder body and a driving arm connected to the piston main body and located outside the cylinder body, the permanent magnet is fixed on the driving arm, and the linear compressor is characterized in that: the linear motor comprises an outer stator yoke and an inner rotor yoke, the outer stator yoke is fixed in the shell of the compressor, and the inner rotor yoke is accommodated in an annular space formed by the driving arm and the cylinder body; and the surface of the outer stator yoke and/or the surface of the inner rotor yoke are/is provided with a cutting groove for cutting off a yoke eddy current path.

2. The linear compressor as set forth in claim 1, wherein: the cutting groove is an axial cutting groove with the length direction parallel to the axial direction of the corresponding yoke iron.

3. The linear compressor as set forth in claim 1, wherein: the permanent magnet is mounted on the driving arm through a mechanical fixing structure.

4. A linear compressor as claimed in claim 3, wherein: the mechanical fixing structure comprises a first clamping groove and a second clamping groove, the first clamping groove and the second clamping groove are formed in the driving arm, notches of the first clamping groove and the second clamping groove are arranged oppositely, and two ends of the permanent magnet are respectively clamped and embedded in the first clamping groove and the second clamping groove.

5. The linear compressor as set forth in claim 1, wherein: the driving arm is a magnetic steel arm body.

6. The linear compressor as set forth in claim 1, wherein: one end of the piston main body extends out of the cylinder body and is sleeved with a plate spring, and the plate spring is fixed in the compressor shell.

7. The linear compressor of any one of claims 1 to 6, wherein: the pistons are two, the sliding directions of the two piston bodies in the cylinder body are opposite, and the linear motors are correspondingly configured into two groups.

8. A linear stirling cooler comprising a linear compressor, characterized in that: the linear compressor adopts the linear compressor as claimed in any one of claims 1 to 7.

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