CN1670371A - Linear compressor - Google Patents

Abstract

A linear compressor having a stator including: a coil body for generating a magnetic field when a current is supplied to the stator; and an outer core disposed on the coil body while surrounding the coil body so that a magnetic flux passes therethrough. The coil body is formed in a hollow cylindrical shape. The coil body is made of wound wire. The coil body is provided with a shape maintaining member for maintaining the shape of the coil body, and the outer core is supported by the coil body. An impregnating agent such as varnish is used as the shape retaining member. The impregnating agent penetrates into the gaps between the wires, and then is cured so that the shape of the coil body is firmly maintained.

Description

linear compressor

technical field

The present invention relates to linear compressors, and more particularly to a linear compressor having a stator for reciprocating a moving part connected to a piston.

Background technique

In general, a compressor is used to compress and discharge refrigerant to the outside in a cooling cycle in which refrigerant used as a medium sequentially performs compression, condensation, expansion, and evaporation processes. The linear compressor is used to compress refrigerant by a linear motor capable of linear motion through which a piston reciprocates.

A conventional linear motor suitable for performing the above functions includes: a compression unit for compressing refrigerant in a sealed container; and a driving unit for transferring power to the compression unit.

The compression unit includes: a cylinder block in which a compression chamber is defined; and a piston disposed in the compression chamber of the cylinder block so that the piston reciprocates to compress refrigerant. A cylinder head having an inlet chamber and an outlet chamber therein is mounted to one side of the cylinder block.

The driving unit includes: a stator generating a magnetic field when a current is supplied to the stator; an inner core disposed at a predetermined distance from the stator for generating magnetic flux together with the stator; and a moving part disposed between the stator and the inner core Between, used to drive the piston.

The stator of a conventional compressor will be described in more detail below. The stator includes: a cylindrical bobbin; and coils wound around the outer periphery of the bobbin. The outer core is installed on the bobbin along the circumferential direction of the bobbin.

The top and bottom of the bobbin are provided with core installation grooves, and the outer core is engaged into the core installation grooves so that the outer core is fixedly mounted on the bobbin.

In the conventional linear compressor of the above structure, when an alternating current is supplied to the coil, a magnetic field is generated on the outer core. The moving part moves linearly under the magnetic field and the magnetic interaction between the moving part. At the same time, a piston connected to the moving part reciprocates in the compression chamber to compress the refrigerant.

In the stator of a conventional compressor, however, the outer core is mounted to the bobbin. As a result, when the bobbin is deformed by heat generated during operation of the compressor, the outer core may deviate from its original installation position.

Therefore, the gap between the moving part and the outer core cannot be kept constant, thereby reducing the overall efficiency of the linear motor.

Also, when the moving part directly hits the outer core, it can damage the compressor.

Contents of the invention

Accordingly, an aspect of the present invention is to provide a linear compressor capable of preventing deformation of a stator due to heat generated while the compressor is operating.

According to an aspect of the present invention, there is provided a linear compressor including: a piston reciprocating in a cylinder for compressing refrigerant; a moving part reciprocating together with the piston; and a stator, It electromagnetically interacts with a moving part for driving the moving part, wherein the stator includes: a coil body formed of a wound electric wire; a core provided on the coil body; and a shape retaining part for holding the coil body shape so that the core is supported by the coil body.

Preferably, the shape maintaining member is an impregnating agent permeated between electric wires forming the coil body.

Preferably, the coil body and the core are fixedly connected to each other by an injection molded part which is filled between the coil body and the core by injection molding.

Preferably, the coil body is formed in a hollow cylindrical shape, and the core includes: a plurality of cores spaced apart from each other along an outer circumference of the coil body; and an injection molded part filled between the cores.

Preferably, each core is provided with a pair of teeth on a side opposite to the moving part, and the injection-molded part is filled in an interval space formed between the teeth.

Preferably, the injection molded part is formed of a resin material.

Preferably, the compressor further includes a protection member disposed between the core and the coil body for protecting the coil body.

Preferably, the protective member is made of paper.

Brief description of the drawings

The above aspects and other features of the present invention will be appreciated by reading the following detailed description with reference to the accompanying drawings.

and the advantages will become clearer where:

1 is a sectional view of a linear compressor according to the present invention;

Fig. 2 shows a perspective view of a coil body of a linear compressor according to the present invention;

Fig. 3 shows a cross-sectional view of a coil body of a linear compressor according to the present invention;

Fig. 4 shows an exploded perspective view of how to combine the core and the coil body of the linear compressor according to the present invention;

5 shows a perspective view of combining the core and the coil body of the linear compressor according to the present invention through injection molded parts; and

FIG. 6 shows a cross-sectional view of a protective member disposed between each core and a coil body of the linear compressor according to the present invention.

Detailed ways

Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 is a sectional view of a linear compressor according to the present invention.

As shown in FIG. 1 , the linear compressor according to the present invention includes: a compression unit 20 for compressing refrigerant in a sealed container 10 ; and a driving unit 30 for driving the compression unit 20 .

The compression unit 20 includes: a cylinder block 21 having a compression chamber 21a; and a piston 22 disposed in the compression chamber 21a of the cylinder block 21 so that the piston 22 reciprocates. A cylinder head 23 having an inlet chamber (not shown) and an outlet chamber (not shown) therein is mounted to the bottom of the cylinder block 21 .

The drive unit 30 includes: an inner core 31 disposed outside the cylinder block 21; a stator 40 surrounding the inner core 31 and spaced a predetermined distance from the outer periphery of the inner core 31 for generating a magnetic field; and a moving part 50 which There are magnets 51 arranged so that the moving part vertically reciprocates under the action of the magnetic flux between the inner core 31 and the stator 40 . Preferably, the driving unit 30 is a linear motor.

The stator 40 according to the present invention includes: a coil body 41 for generating a magnetic field when current is supplied to the stator 40; and an outer core 42 disposed on the coil body while surrounding the coil body 41 so that magnetic flux passes therethrough.

Referring to FIG. 2 , the coil body 41 is formed in a hollow cylindrical shape. The coil body 41 is made of a wound electric wire 41a. The coil body 41 is provided with a shape maintaining member 41 b for maintaining the shape of the coil body 41 , and the outer core 42 is supported by the coil body 41 as shown in FIG. 3 .

An impregnating agent such as varnish may be used for the shape maintaining member 41b. The impregnating agent penetrates into the gaps between the electric wires 41a, and then solidifies, so that the shape of the coil body 41 is firmly maintained. A varnish is a paint that can be made from natural or synthetic resins dissolved in a solvent. Varnish forms a transparent glossy film.

A plurality of outer cores 42 spaced apart from each other as shown in FIG. 4 are provided along the outer circumference of the impregnated coil body 41 . Each outer core 42 includes an upper outer core 42a and a lower outer core 42b. The outer core portions 42a and 42b are mounted on the coil body in correspondence with each other. The sides of the outer core portions 42a and 42b opposite to the moving part 50 are respectively provided with teeth 42c and 42d, and the area of the outer core 42 electromagnetically interacting with the moving part 50 is increased by the teeth 42c and 42d, thereby effectively increasing the The stroke of the piston 22.

As shown in FIG. 5 , the coil body 41 and the outer core 42 are fixedly connected to each other with an injection molded part 43 filled between the coil body 41 and the outer core 42 by injection molding. The injection molded part 43 is made of a resin material. The injection molded part 43 is filled in the interval space defined between the outer cores 42 and between the tooth portions 42 c and 42 d of the outer core 42 so that the outer cores are fixedly connected to the coil body 41 .

Referring to FIG. 6 , the stator 40 according to the present invention further includes a protection member 44 disposed between the coil body 41 and each outer core 42 for surrounding the coil body 41 so as to prevent damage to the coil body. Preferably, the protective component 44 can be thin paper, and the magnetic flux can flow smoothly between the coil body 41 and the outer core 42 through the protective component 44 .

Now, the operation and effect of the linear compressor having the above structure according to the present invention will be described.

When a current is supplied to the coil body made of the wound electric wire 41a, a magnetic field is generated. The magnetic field interacts with the magnetic field generated by the magnet 51 mounted on the moving part 50 so that the piston 22 reciprocates vertically. As the piston 22 reciprocates, refrigerant is introduced, compressed and discharged.

At this time, the coil body 41 and the outer core 42 are firmly connected to each other with an injection molded part 43 made of a resin material and formed by injection molding. As a result, vibration of the outer core 42 or separation from the coil body 41 due to vibration generated during operation of the compressor is prevented.

In the stator 40 according to the present invention, the outer core 42 is directly connected to the coil body without requiring an additional bobbin. Accordingly, deformation of the stator 40 due to heat generated during operation of the compressor is prevented.

As apparent from the above description, the present invention provides a linear compressor in which the outer core 40 is directly connected to the coil body without requiring an additional bobbin, and the outer core is formed by injection molding. The components are securely fastened to the coil body.

Accordingly, deformation of the stator due to heat generated during operation of the compressor is prevented, so that a gap between the moving part and the outer core is kept constant. As a result, the initial gap between the moving part and the outer core is set to be minimum, thereby increasing the efficiency of the linear motor.

Also, the linear compressor according to the present invention does not require a bobbin, thereby increasing the number of wound electric wires forming the coil body. Therefore, the output of the linear motor is increased, the manufacturing process is simplified, and the manufacturing cost is reduced.

Although some preferred embodiments of the present invention have been disclosed for the purpose of illustration, however, those skilled in the art will appreciate that various other embodiments may be employed without departing from the scope and spirit of the present invention as disclosed in the appended claims. changes, additions and substitutions.

Claims (8)

1. A linear compressor comprising: a piston reciprocating in a cylinder for compressing refrigerant; a moving part reciprocating together with the piston; and a stator electromagnetically interacting with the moving part for driving Moving parts, where the stator consists of: a coil body formed from wound wire; a core disposed on the coil body; and A shape maintaining member for maintaining the shape of the coil body so as to support the core by the coil body. 2. The compressor according to claim 1, wherein the shape maintaining member is an impregnating agent permeated between electric wires forming the coil body. 3. The compressor according to claim 1, wherein the coil body and the core are fixedly connected to each other by an injection molded part that is filled between the coil body and the core by injection molding . 4. The compressor according to claim 3, wherein the coil body is formed in a hollow cylindrical shape, and the core includes: a plurality of cores spaced apart from each other along the outer circumference of the coil body; Injection molded parts. 5. The compressor according to claim 4, wherein a side portion of each core portion opposite to the moving part is provided with a pair of teeth, and the injection molded part is filled in an interval space formed between the teeth. 6. The compressor of claim 3, wherein the injection molded part is formed of a resin material. 7. The compressor of claim 1, further comprising a protection member disposed between the core and the coil body to protect the coil body. 8. The compressor according to claim 7, wherein the protective member is made of paper.

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