JP2004332719A - Linear compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a linear compressor capable of firmly fixing a core to a bobbin by improving a fixing structure between the bobbin and the core. <P>SOLUTION: An outer core 43 is fitted to a core fitting groove 41a formed in upper and lower sides of a bobbin 41, and the bobbin 41 and the outer core 43 are firmly fixed to each other by moldings 44 filled between the bobbin 41 and the outer core 43 through injection molding. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a linear compressor, and more particularly, to a linear compressor including a mover and a stator for moving a piston forward and backward.

  2. Description of the Related Art Generally, a compressor compresses and discharges refrigerant to the outside in a refrigeration cycle in which compression, condensation, expansion, and evaporation processes are continuously performed using refrigerant as a medium. Among them, in the linear compressor, a linear motor that outputs a linear motion force linearly reciprocates a piston to compress the refrigerant.

  A conventional linear compressor having such a function includes a compression unit for compressing a refrigerant and a drive unit for supplying power to the compression unit in a closed container.

  The compression section includes a cylinder block in which a compression chamber is formed, and a piston that moves in and out of the compression chamber to compress the refrigerant, and a cylinder head in which a suction chamber and a discharge chamber are formed on one side of the cylinder block. Be combined.

  The driving unit is provided with a stator that forms a magnetic field by applying power, an inner core that forms a magnetic flux together with the stator at a predetermined distance from the stator, and is provided between the stator and the inner core to drive the piston. Mover.

  The stator of the conventional compressor will be described in more detail. The stator includes a cylindrical bobbin and a coil wound on the outer peripheral surface of the bobbin, and the bobbin is provided with an outer core in a circumferential direction.

  At this time, a core mounting groove is formed on the upper and lower surfaces of the bobbin, and an outer core is mounted on the core mounting groove.

  In the conventional linear compressor configured as described above, when power is applied to the coil, a magnetic field is formed in the outer core, and the mover performs linear motion due to a magnetic interaction between the magnetic field and the mover. At the same time, the piston connected to the mover reciprocates in the compression chamber to compress the refrigerant.

  However, since the conventional compressor has a structure in which the outer core is simply coupled to the bobbin, if the bobbin is deformed by the heat generated during driving, or if the vibration generated during driving is continuously applied to the bobbin, The outer core attached to the first detaches from the attachment position.

  As a result, the gap between the mover and the outer core cannot be kept constant, and the overall efficiency of the linear motor decreases.

  In addition, when the mover and the outer core directly collide with each other, a fatal problem that the compressor is damaged occurs.

  Therefore, the present invention has been made to solve such a conventional problem, and an object of the present invention is to improve a fixing structure between a bobbin and a core to provide a linear compressor that can fix a core to a bobbin firmly. To provide.

  In order to achieve the above object, the present invention provides a piston that moves in and out of a cylinder to compress a refrigerant, a mover that moves together with the piston, and drives the mover by interacting with the mover. A linear compressor comprising: a stator that includes a bobbin around which a coil is wound, and a core that surrounds the bobbin, wherein the core and the bobbin are formed between the core and the bobbin by injection molding. Provided is a linear compressor configured to be fixed by a molded product filled in a linear compressor.

  The core is composed of a number of cores, and the molding is filled between the cores. The core has a pair of teeth on the side facing the mover, and the molded product is filled in a space between the pair of teeth. The molded product is made of a resin material.

  According to the present invention as described above, the outer core is firmly fixed to the bobbin by the injection molded product. Therefore, when the compressor is driven, the gap between the mover and the outer core is kept constant, and the gap between the mover and the outer core can be initially set to a minimum, thereby improving the efficiency of the linear motor. Can be.

  Hereinafter, preferred embodiments of the present invention will 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 a refrigerant and a driving unit 30 for driving the compression unit 20 in a closed container 10.

  The compression section 20 includes a cylinder block 21 that forms a compression chamber 21a, and a piston 22 that is provided in the compression chamber 21a so as to be able to reciprocate. A suction chamber (not shown) is provided below the cylinder block 21. ) And a cylinder head 23 in which a discharge chamber (not shown) is formed.

  The drive unit 30 includes an inner core 31 provided outside the cylinder block 21, a stator 40 that surrounds the inner core 31 at a predetermined interval from the outer peripheral surface of the inner core 31, and forms a magnetic field, and is fixed to the inner core 31. A linear motor includes a movable element 50 provided with a magnet 51 so as to reciprocate up and down by magnetic flux between the elements 40.

  The stator 40 includes a bobbin 41 around which a coil 42 is wound, and an outer core 43 surrounding the bobbin. Hereinafter, the connection between the bobbin 41 and the outer core 43 will be described in detail with reference to FIGS.

  As shown in FIG. 2, the bobbin 41 is formed in a cylindrical shape, and a plurality of core mounting grooves 41a are formed on upper and lower surfaces of the bobbin 41 so as to be circumferentially separated. First, a coil 42 is wound around the outer peripheral surface of such a bobbin 41.

  The outer core 43 as shown in FIG. 3 is mounted in the core mounting groove 41a of the bobbin 41. At this time, the outer core 43 has a pair of teeth 43a and 43b on the side facing the mover 50, respectively. Due to the teeth 43a and 43b, the area of the outer core 43 facing the mover 50 electromagnetically increases, so that the stroke of the piston 22 can be effectively increased.

  Subsequently, as shown in FIG. 4, the bobbin 41 and the outer core 43 are fixed by a molding 44 filled between the bobbin 41 and the outer core 43 by injection molding.

  The molded product 44 is mainly made of a resin material, and is filled in the space between the outer cores 43 and in the space between the teeth 43a and 43b of the outer core 43, so that the outer core 43 is firmly attached to the bobbin 41. Fix it.

  Next, the operation of the linear compressor according to the present invention and its effects will be described. First, when power is applied to the coil 42 wound around the outer peripheral surface of the bobbin 41, the magnetic field generated from the coil interacts with the magnetic field of the magnet 51 provided on the mover 50 to reciprocate the piston 22 in the vertical direction. Then, the refrigerant is sucked and compressed by the reciprocating motion of the piston 22 and then discharged.

  At this time, since the bobbin 41 and the outer core 43 are firmly fixed by the injection-molded resin molded product 44, the outer core 43 may move or separate from the bobbin 41 due to vibration generated when the compressor is driven. Can be prevented.

  Furthermore, since the molding 44 surrounds the bobbin 41, it is possible to prevent the bobbin 41 from being thermally deformed by the heat generated when the compressor is driven.

1 is a sectional view of a linear compressor according to the present invention. FIG. 3 is a perspective view showing a connection between a bobbin and a coil provided in the linear compressor according to the present invention. 1 is a perspective view illustrating an outer core of a linear compressor according to the present invention. FIG. 3 is a perspective view showing a connection between a bobbin and an outer core provided in the linear compressor according to the present invention.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 10 Closed container 20 Compression part 21 Cylinder block 21a Compression chamber 22 Piston 23 Cylinder head 30 Drive part 31 Inner core 40 Stator 41 Bobbin 41a Core mounting groove 42 Coil 43 Outer cores 43a, 43b Teeth 44 Molding member 50 Mover 51 magnet

Claims (4)

In a linear compressor including a piston that moves forward and backward inside the cylinder to compress the refrigerant, a mover that moves forward and backward with the piston, and a stator that interacts with the mover to drive the mover,
The stator includes a bobbin around which a coil is wound, and a core surrounding the bobbin, wherein the core and the bobbin are fixed by a molding filled between the core and the bobbin by injection molding. And a linear compressor.   2. The linear compressor according to claim 1, wherein the core includes a plurality of cores, and the molded product is filled between the cores. 3.   The linear compression according to claim 2, wherein the core has a pair of teeth on a side facing the mover, and the molded product is filled in a space between the pair of teeth. Machine.   The linear compressor according to claim 1, wherein the molded product is made of a resin material.

Images