CN100517911C - Linear motor and linear compressor having the same - Google Patents

Abstract

The invention relates to a linear compressor. The stator of the linear compressor comprises: an iron core with an opening on the outside, two protruding parts extending inward from both ends of the opening of the iron core to cover the opening and spaced apart from each other, and a winding Coils in the space inside the two projections and in the space between the two projections. That is, since the coil is wound in the space formed between the two protruding parts, the magnetic flux generated around the coil is increased, thereby increasing the driving force of the moving part. The overall performance of the compressor is thus improved.

Description

Linear motor and linear compressor having such a linear motor

This application claims priority from Korean Patent Application No. 2003-83190 filed with the Korean Intellectual Property Office on Nov. 21, 2003, the disclosure of which is incorporated herein by reference.

technical field

The present invention generally relates to a linear compressor, and more particularly, to a linear compressor including a linear motor mounted with a power source and operating a piston.

Background technique

Generally, a linear compressor is used for compressing refrigerant of a refrigeration device such as a refrigerator and an air conditioner, and refers to a compressor that uses a linear reciprocating motor as a driving device to drive a piston to reciprocate.

The existing linear compressor includes a cylinder body, a piston and a cylinder head. A compression chamber is formed in the cylinder body. The piston is arranged to reciprocate in the compression chamber. A suction chamber and a suction chamber for sucking refrigerant are formed in the cylinder head. Discharge chamber for discharging refrigerant.

In addition, as a drive device for driving the reciprocating motion of the piston, the existing linear compressor includes a linear motor. The linear motor includes a moving part, a first iron core and a stator respectively fixed on the inside and outside of the moving part, and the moving part is connected with the piston. And it is connected as a whole with the cylindrical magnet that surrounds the cylinder body.

The stator includes a second core made of conductive steel plates and coils that generate magnetic lines of force. In the second core, the side of the second core facing the magnet is open, and two protruding parts extend inwardly a predetermined distance from both ends of the opening of the second core to cover the opening part. These two protruding parts can increase the area of the second iron core facing the magnet, thereby increasing the stroke of the magnet.

The coil is located in the inner space of the two protruding parts, so the second core can generate magnetic flux, and the magnetic flux flows from the second core through the magnet into the first core.

However, in the existing linear compressor, the installation position of the coil is limited to the space inside the two protruding portions of the second core.

Therefore, if the diameter of the coil is to be increased to increase the driving force of the moving parts, the volume of the stator has to be increased.

Contents of the invention

Therefore, one aspect of the present invention is to provide a linear motor and a linear compressor with the linear motor, which can effectively increase the driving force of the moving parts by improving the coil structure wound around the stator.

Other features and/or advantages of the present invention will be described in part in the following description, and in part will be obvious from the description or can be obtained by practice of the present invention.

The above and/or other aspects of the present invention are achieved by providing a linear compressor comprising a moving part capable of reciprocating with a piston to compress refrigerant and a stator capable of generating a magnetic field interacting with the moving part, The stator includes: an iron core with an opening on the outside; two protruding portions extending inward from both ends of the opening of the iron core to cover the opening portion, and spaced apart from each other; A space inside the extensions and a coil located in the space between the two extensions.

In the linear compressor, the coil is wound in a shape matching the shape of the two protrusions.

In the linear compressor, the two protruding portions have opposite ends inclined and approaching each other at outer edges.

In the linear compressor, the two protrusions have opposite ends each having a semicircular shape.

The above and/or other aspects of the present invention are achieved by providing a linear motor comprising a stator, a first iron core, and a magnet reciprocating between the stator and the first iron core. The stator includes: a second iron core having an opening on the outside; two protruding portions extending inwardly from both ends of the opening of the second iron core to cover the opening portion, which are spaced apart from each other; The space inside the two protruding parts and the coil located in the space between the two protruding parts.

In a linear motor, the coil is wound in a shape that matches the shape of the two protrusions.

In the linear motor, the two protrusions have opposite ends that are inclined and approach each other at outer edges.

In the linear motor, the two projecting portions have opposite ends each having a semicircular shape.

Description of drawings

These and other features and advantages of the present invention can be clearly and easily obtained from the following description of preferred embodiments of the present invention in conjunction with the accompanying drawings, wherein:

Fig. 1 is a side sectional view showing the overall structure of a linear compressor of the present invention;

Fig. 2 is a perspective view of a stator and moving parts in the linear compressor shown in Fig. 1;

Fig. 3 is the sectional view of the stator of another embodiment of the present invention;

Fig. 4 is a sectional view showing a stator of still another embodiment of the present invention.

Detailed ways

The preferred embodiments of the present invention shown in the accompanying drawings will be described in detail below, wherein like reference numerals refer to like parts.

As shown in Figure 1, the linear compressor of the present invention comprises a closed casing 10, a compression device 20 and a drive device 30, the casing 10 is formed by an upper casing 11 and a lower casing 12 to form a closed structure, and the compression device 20 It is used to extract, compress and discharge refrigerant, and the drive device 30 is used to drive the compression device 20 .

The compression device 20 includes a cylinder body 21, a piston 22 and a cylinder head 23. The cylinder body 21 forms a compression chamber 21a, the piston 22 is arranged to reciprocate in the compression chamber 21a, and the cylinder head 23 is used for extracting and discharging refrigerant. In addition, a support member 25 protrudes outward from the lower outer surface of the cylinder 21 for supporting a stator 32 of the driving device 30, which will be described later. A suction chamber 23a and a discharge chamber 23b working together with the compression chamber 21a are formed in the cylinder head 23, and when the piston 22 reciprocates, refrigerant can be sucked in and discharged, respectively. In addition, a valve plate 24 is provided between the cylinder head 23 and the cylinder body 21, and a suction valve 24a and a discharge valve 24b are mounted on the valve plate 24 for opening and closing the suction chamber 23a and the discharge chamber 23b respectively.

The driving device 30 includes a linear motor, which includes a first iron core 31, a stator 32 and a moving part 35, the first iron core 31 is connected to the outside of the cylinder body 21, the stator 32 is spaced from the first iron core 31 by a certain distance, The moving part 35 is disposed between the first iron core 31 and the stator 32 , and can interact with the electric field generated by the stator 32 .

The moving part 35 includes a cylindrical magnet 35a disposed around the cylinder 21 and a supporting part 35b for fixing and supporting the magnet 35a. The supporting part 35b of the moving part 35 is arranged coaxially with the connecting shaft 22a provided on the upper part of the piston 22 so that the supporting part 35b of the moving part 35 can reciprocate together with the piston 22 in the vertical direction.

The first iron core 31 and the stator 32 are disposed inside and outside of the magnet 35a, respectively. In this case, the first iron core 31 is provided outside the cylinder 21 and formed into a cylindrical shape, so that the first iron core 31 simultaneously guides the reciprocating motion of the moving part 35 and smoothly flows the magnetic flux from the stator 32 through the moving part 35. Magnet 35a.

The stator 32 includes a second core 33 made of a conductive steel plate and a coil 34 that generates lines of magnetic force. The lower end of the stator 32 is supported by the supporting member 25 , and the upper end of the stator 32 is supported by the fixing bracket 40 .

The structure of the stator 32 of the linear compressor of the present invention will be described in detail below with reference to FIG. 2 .

As shown in FIG. 2, the second iron core 33 of the stator 32 is made of conductive steel plates stacked in the radial direction. In this case, the side of the second core 33 facing the magnet 35a is open, and the first and second protruding portions 33b and 33c extend inwardly from the upper and lower ends of the opening 33a of the second core 33, thereby covering the The upper and lower parts of the opening 33a.

Therefore, the first and second protruding portions 33b and 33c increase the area of the second core 33 facing the magnet 35a, thereby increasing the stroke of the magnet 35a. The first and second projecting portions 33b and 33c are spaced apart from each other so that the lines of magnetic force generated by the coil 34 flow smoothly from the second core 33 to the first core 31 via the magnet 35a.

The coil 34 is wound through a first accommodating portion 33d formed inside the first and second protruding portions 33b and 33c and a second accommodating portion 33e formed in a space between the first and second protruding portions 33b and 33c . In this case, the coil 34 is wound into a shape matching the first and second accommodating portions 33d and 33e so as to be wound in the first and second accommodating portions 33d and 33e to a maximum extent.

As shown in FIG. 3, in the second core 33, the ends of the first and second protruding portions 33b and 33c may be inclined so as to approach each other at their outer edges so as to avoid leakage of the magnetic flux and to prevent the magnetic flux from flowing. The lines of magnetic force flow toward the magnet 35a while passing through the space between the first and second projecting portions 33b and 33c.

In this case, the coil 34 is wound in a shape matching the shape of the first and second protruding portions 33b and 33c, so that the coil 34 is wound between the first and second protruding portions 33b and 33c. in space.

As shown in FIG. 4, each end portion of the first and second protruding portions 33b and 33c may be semicircular in order to avoid leakage of magnetic force lines. In this case, the coil 34 is wound in a shape matching the shape of the ends of the first and second protruding portions 33b and 33c.

The entire working process and effect of the linear compressor of the present invention will be described below.

When an alternating current (AC) is supplied to the coil 34 of the stator 32 , a magnetic field is generated between the stator 32 and the first core 31 . Therefore, due to the alternating current, the polarity of the magnetic field changes periodically, so that the moving part 35 together with the magnet 35a connected thereto reciprocates in the vertical direction. In addition, when the moving part 35 reciprocates, the piston 22 connected with the moving part 35 reciprocates in the compression chamber 21a while compressing the refrigerant.

In this case, in the stator 32 of the linear compressor of the present invention, the coil 34 is wound not only in the first accommodating portion 33d formed inside the first and second protruding portions 33b and 33c, but also in the In the second accommodation portion 33e in the space between the first and second projecting portions 33b and 33c. Therefore, when the coil 34 is wound with the same number of turns as in the existing compressor, the diameter of the coil 34 may be increased.

Therefore, since the resistance of the coil 34 is reduced, the current value passing through the coil 34 and the magnetic flux generated around the coil 34 are increased, thereby increasing the driving force of the moving part 35 .

As described above, the stator of the linear compressor of the present invention has an opening at one side thereof, and includes an iron core with two protrusions at the opening, and wound in the inner space of the two protrusions and two protrusions. The coils in the space formed between the parts.

That is, the coil is also wound in the space formed between the two protruding parts, thus increasing the magnetic flux generated around the coil, thereby increasing the driving force of the moving part. The overall performance of the compressor is thus improved.

Although several preferred embodiments of the present invention have been shown and described above, those skilled in the art will readily understand that changes can be made to these embodiments without departing from the basic principles and essential spirit of the present invention. Changes are included within the scope of protection required by the claims and their equivalents.

Claims (2)

1. A linear compressor comprising: A moving part that reciprocates with the piston to compress the refrigerant; and a stator for generating a magnetic field interacting with the moving part, the stator comprising: an iron core having an opening on the outside; two protruding portions extending inward from both ends of the opening of the iron core to cover the opening portion, they are spaced apart from each other; and a coil wound in a space inside the two protruding parts and in a space between the two protruding parts; The two protruding portions have opposite ends each having a semicircular shape. 2. A linear motor, comprising: A stator comprising: a second iron core having an opening on the outside; two protruding portions extending inwardly from both ends of the opening of the second iron core to cover the opening portion, which are spaced apart from each other; a space inside the two protruding parts and a coil located in the space between the two protruding parts; first core; and a magnet reciprocating between the stator and the first core; The two protruding portions have opposite ends each having a semicircular shape.

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