KR102494949B1 - Linear compressor - Google Patents

Abstract

A linear compressor according to the present invention includes a drive unit having a reciprocating mover, a stator for generating electromagnetic force for driving the mover, and a winding coil; and a compression unit including a cylinder and a piston reciprocating in the cylinder by the mover, wherein the stator is formed such that directions of easy magnetization are uniformly distributed on the path of magnetic flux formed by the winding coil. It has at least one directional core part disposed on. According to this, core loss can be reduced and motor efficiency can be improved.

Description

Linear compressor {LINEAR COMPRESSOR}

The present invention relates to a linear compressor configured to compress a fluid by linear reciprocating motion of a vibrating body.

In general, a compressor refers to a device configured to compress a working fluid such as air or refrigerant by receiving power from a power generating device such as a motor or a turbine. BACKGROUND ART Compressors are widely applied to industries in general or home appliances, in particular, to refrigerating cycles in vapor compression chambers (hereinafter referred to as 'refrigeration cycles').

Types of these compressors include a reciprocating compressor in which a compression chamber is formed between a piston and a cylinder and a piston linearly reciprocates to compress fluid, a rotary compressor to compress fluid by a roller rotating eccentrically inside a cylinder, and a spiral compressor. There is a scroll compressor in which a pair of scrolls are engaged and rotated to compress fluid.

Recently, among reciprocating compressors, a linear compressor employing a linear motor performing linear reciprocating motion without using a crankshaft has been developed. The linear compressor has the advantage of improving efficiency and having a simple structure because there is no mechanical loss associated with converting rotational motion into linear reciprocating motion.

In such a linear compressor, a cylinder is positioned inside a casing forming a sealed space to form a compression chamber, and a piston covering the compression chamber is configured to reciprocate inside the cylinder. That is, as the piston is moved to be located at the bottom dead center (BDC), the fluid in the closed space is sucked into the compression chamber, and as it is moved to be located at the top dead center (TDC), the fluid in the compression chamber is compressed and discharged. process is repeated.

On the other hand, a linear motor for driving the reciprocating motion of a piston is generally composed of a stator connected to a cylinder and wound with a coil, and a mover connected to the piston and reciprocated. The stator forms a magnetic flux path formed by the current flowing through the coil, and is generally made of a non-directional material, for example, a non-oriented silicon steel sheet.

Here, non-directional means that magnetic properties hardly change depending on the direction of the material. Since the direction of the magnetic flux flowing through the stator repeatedly changes according to the position of the reciprocating mover during operation of the linear compressor, the stator made of non-directional material can provide electromagnetic force without being greatly affected by the position of the mover.

On the other hand, the linear motor of the linear compressor repeatedly changes the magnetic field distribution according to the operating frequency. Energy loss occurs in the process of magnetizing the stator (iron core) by the magnetic field generated by the coil, which is also called core loss. Core loss is an unavoidable loss in order to obtain a predetermined magnetic flux density at a specific frequency, and reducing it can increase the efficiency of the linear motor.

In this situation, a method of forming the stator with a material that can reduce core loss than a conventional non-directional material can be considered. There is a need to design

One object of the present invention is to provide a linear compressor having a stator made of a material in which directions of easy magnetization of crystals are distributed in one direction so as to reduce core loss.

Another object of the present invention is to provide a linear compressor in which a portion of a stator placed in a magnetic flux path is made of a grain-oriented electrical steel sheet and core loss can be reduced.

In order to achieve one object of the present invention, a linear compressor according to the present invention includes a drive unit having a reciprocating mover, a stator and a winding coil that generate electromagnetic force for driving the mover; and a compression unit including a cylinder and a piston reciprocating in the cylinder by the mover, wherein the stator is formed such that an easy direction of magnetization is uniformly distributed by the winding coil. At least one directional core part is disposed on the path of the magnetic flux to be formed.

The oriented core part may be made of a grain oriented electrical steel sheet.

The stator may include an inner core fixed to an outer circumferential surface of the cylinder; and an outer core spaced apart from the inner core to form an air gap accommodating the mover and having the directional core part.

The directional core part may include a pair of radial core parts spaced apart from each other with the winding coil interposed therebetween, extending in the radial direction of the cylinder, and having a direction of easy magnetization parallel to the radial direction of the cylinder.

The directional core part may further include a reciprocating direction core part extending to connect the pair of radial core parts to each other in the reciprocating direction of the piston and having a direction of easy magnetization parallel to the reciprocating direction of the piston.

The pair of radial core parts has a pair of inclined surfaces inclined in opposite directions so as to face each other at the outer circumferential end, and the reciprocating core part has both surfaces contacted and coupled to the pair of inclined surfaces. It may be provided with an inclined coupling surface formed at the end.

The directional core part may include a pair of connection core parts coupled to outer circumferential ends of the pair of radial core parts and having an easy magnetization direction inclined with respect to the easy magnetization direction of the pair of radial core parts; and a reciprocating direction core part extending to connect the pair of connecting core parts to each other in the reciprocating direction of the piston and having an easy magnetization direction parallel to the reciprocating direction of the piston.

In order to achieve another object of the present invention, a linear compressor according to the present invention includes a drive unit having a reciprocating mover, a stator and a winding coil that generate electromagnetic force for driving the mover; And a compression unit including a cylinder and a piston reciprocating in the cylinder by the mover, wherein the stator is spaced apart from each other in a radial direction of the cylinder to form an air gap accommodating the mover, and the non-directional a non-oriented core made of electrical steel; and a grain-oriented core portion formed of a grain-oriented electrical steel sheet and connected to the non-oriented electrical steel sheet to form a coil accommodating portion accommodating the winding coil.

The directional core part may include a pair of radial core parts spaced apart from each other with the winding coil therebetween, extending in a radial direction of the cylinder from the non-directional core part, and having a rolling direction parallel to the radial direction; and a reciprocating direction core part extending to connect the pair of radial core parts to each other in the reciprocating direction of the piston and having a rolling direction parallel to the reciprocating direction of the piston.

According to the present invention constituted by the solution described above, the following effects are obtained.

In the linear compressor according to the present invention, since the stator is provided with a directional core, core loss can be reduced during repetitive magnetization according to the operation of the driving unit. Accordingly, motor efficiency of the linear compressor may be improved.

In the linear compressor according to the present invention, since the stator is formed by a combination of the non-oriented electrical steel sheet and the grain-oriented electrical steel sheet, core loss can be reduced in each of the fixed and non-uniform portions of the stator, and as a result, the present invention The drive and compression units can operate more efficiently.

1 is a longitudinal sectional view showing a linear compressor according to an embodiment of the present invention;
2 is a cross-sectional view of the stator shown in FIG. 1;
Figures 3a and 3b are diagrams showing the path of magnetic flux formed in the stator shown in Figure 2 according to the position of the mover.
4 is a cross-sectional view of a stator according to another embodiment of the present invention;

Hereinafter, a linear compressor related to the present invention will be described in more detail with reference to the drawings.

In describing the embodiments disclosed in this specification, if it is determined that a detailed description of a related known technology may obscure the gist of the embodiment disclosed in this specification, the detailed description thereof will be omitted.

The accompanying drawings are only for easy understanding of the embodiments disclosed in this specification, and the technical idea disclosed in this specification is not limited by the accompanying drawings, and all changes and equivalents included in the spirit and technical scope of the present invention It should be understood to include water or substitutes.

Singular expressions include plural expressions unless the context clearly dictates otherwise.

The linear compressor according to the present invention performs an operation of sucking in fluid, compressing it, and discharging the compressed fluid. The linear compressor according to the present invention may be a component of a vapor compression type refrigeration cycle, and the fluid will be described below as an example of a refrigerant circulating in the refrigeration cycle.

1 is a longitudinal cross-sectional view showing a linear compressor according to an embodiment of the present invention. Referring to FIG. 1 , the linear compressor 100 of the present invention includes a casing 110, a driving unit 130 and a compression unit 140.

The casing 110 may form an enclosed space. The closed space may be a suction space 101 in which the refrigerant to be compressed is sucked and filled. In order for the refrigerant to be sucked into the suction space 101, a suction port 114 may be formed in the casing 110 and a suction pipe SP may be mounted. In addition, a discharge port through which the refrigerant is discharged to the outside from a discharge space 102 described later may be formed in the casing 110 and connected to a discharge pipe DP.

In addition, a frame for supporting the drive unit 130 and the compression unit 140 may be formed inside the casing 110 . The frame may include a front frame 121 and a rear frame 122 respectively coupled to both ends of the stator 131 to be described later. In addition, a cylinder 141 to be described below may be connected to the center of the front frame 121 .

The driving unit 130 may serve to generate reciprocating motion of the linear compressor 100 according to the present invention. To this end, the drive unit 130 may include a stator 131 and a mover 132. The stator 131 may be coupled to the front and rear frames 121 and 122 . The stator 131 may include an outer core 131a disposed to surround a compression unit 140 to be described later, and an inner core 131b spaced apart from the inner side of the outer core 131a and surrounding the compression unit 140. can A mover 132 may be positioned between the outer core 131a and the inner core 131b.

Meanwhile, a winding coil 133 may be mounted on the outer core 131a, and the mover 132 may include a permanent magnet. Accordingly, when a current is applied to the driving unit 130 , magnetic flux may be formed in the stator 131 by the winding coil 133 . Electromagnetic force capable of moving the mover 132 may be generated by the interaction of the magnetic flux formed by the application of current and the magnetic flux formed by the permanent magnet.

The compression unit 140 sucks in, compresses, and discharges the refrigerant in the suction space 101 . The compression unit 140 may be located in the center of the casing 110 to the inside of the inner core 131b, and includes a cylinder 141 and a piston 142. Cylinder 141 is supported by the front frame 121 may form a compression chamber (P) therein. The cylinder 141 may have a cylindrical shape with both ends open. One end of the cylinder 141 may be closed by the discharge valve 143 and the discharge cover 144, and the other end may accommodate the piston 142.

A discharge space 102 may be formed between the discharge valve 143 and the discharge cover 144 . As shown, the compression chamber P and the discharge cover 144 may form a space separated from each other by the discharge valve 143. The discharge valve 143 is supported by an elastic member (not shown) on the discharge cover 144 and can be moved to open and close one open end of the cylinder 141 . Meanwhile, inside the casing 110, a discharge tube 111 extending to communicate the discharge port, the discharge pipe DP, and the discharge space 102 may be installed.

The piston 142 may be inserted into the other open end of the cylinder 141 to seal the compression chamber P. The piston 142 is made to be connected to the mover 132 described above, and can be reciprocated together with the mover 132. An inner core 131b and a cylinder 141 may be positioned between the mover 132 and the piston 142 . Accordingly, the mover 132 and the piston 142 may be coupled to each other by a separate moving frame 145 formed to bypass the cylinder 141 and the inner core 131b.

In the piston 142, a suction port 142a is formed to pass through one end of the compression chamber P for sealing. In this embodiment, the piston 142 is sucked into the compression chamber P between the piston 142 and the cylinder 141 by flowing the refrigerant of the suction space 101 through its internal space and passing through the suction port 142a. It can be. In addition, a suction valve 142b for opening and closing the suction port 142a may be mounted on one end surface of the piston 142 adjacent to the compression chamber P. The suction valve 142b may be operated by elastic deformation. That is, the suction valve 142b may be elastically deformed to open the suction port 142a by the pressure of the refrigerant flowing toward the compression chamber P through the suction port 142a.

Meanwhile, the driving unit 130 and the compression unit 140 described above may be supported by the support spring 150 and the resonance spring 160 . The support spring 150 serves to elastically support the driving and compression units 130 and 140 to the casing 110 . The support spring 150 may support the drive and compression units 130 and 140 at both ends in the reciprocating direction of the piston 142, and may be formed of a plate spring.

To support one end, a connection member 146 may be coupled to protrude from one end of the discharge cover 144 forming the discharge space 102 . The connection member 146 may be fixed to the central portion of the support spring 150, which is a leaf spring, and the outer circumferential portion of the support spring 150 may be fixed to the inner wall of the casing 110.

The center of the support spring 150 for supporting the other end may be fixed to the suction guide 112 formed to protrude from the suction port 114 into the casing 110, and the outer circumferential portion of the rear frame 122 It can be fixed to the cover member 123 coupled with.

The resonance spring 160 may be positioned between the rear frame 122 and the cover member 123 . As shown, the resonance spring 160 may be made of a coil spring. Both ends of the resonance spring 160 may be connected to the stationary body and the vibrating body, respectively. For example, one end of the resonance spring 160 may be connected to the moving frame 145 and the other end may be connected to the cover member 123 . Accordingly, it can be elastically deformed between the vibrating body vibrating at one end and the stationary body fixed at the other end. The natural frequency of the resonance spring 160 is designed to match the resonance frequency of the mover and the piston 142 during compressor operation, so that the reciprocating motion of the piston 142 can be amplified. However, since the stationary body is elastically supported by the casing 110 and the support spring 150, it may not be strictly fixed during operation of the compressor.

The linear compressor 100 described above operates as follows.

First, when a current is applied to the drive unit 130 , magnetic flux may be formed in the stator 131 by the current flowing through the winding coil 133 . By the electromagnetic force generated by the magnetic flux formed in the stator 131, the mover 132 having a permanent magnet can be linearly reciprocated. This electromagnetic force is generated in the direction of the piston 142 toward the top dead center (TDC) during the compression stroke, and in the direction of the piston 142 toward the bottom dead center (BDC) during the intake stroke. can occur alternately. That is, the driving unit 130 may generate thrust, which is a force pushing the mover 132 and the piston 142 in the moving direction.

The piston 142 reciprocating inside the cylinder 141 repeats the movement of increasing and decreasing the volume of the compression chamber P. When the piston 142 moves while increasing the volume of the compression chamber P, the pressure inside the compression chamber P decreases. Accordingly, the suction valve 142b mounted on the piston 142 is opened, and the refrigerant staying in the suction space 101 may be sucked into the compression chamber P. This intake stroke proceeds until the piston 142 increases the volume of the compression chamber P to the maximum and is positioned at the bottom dead center.

The movement direction of the piston 142 reaching the bottom dead center is changed to perform a compression stroke while reducing the volume of the compression chamber P. The compression stroke is performed while the piston 142 is moved to top dead center where the volume of the compression chamber P is reduced to a minimum. During the compression stroke, the pressure inside the compression chamber P increases so that the sucked refrigerant can be compressed. When the pressure in the compression chamber P reaches the preset pressure, the pressure in the compression chamber P pushes the discharge valve 143 away from the cylinder 141 to open it so that the refrigerant is discharged into the discharge space 102. .

As the suction and compression strokes of the piston 142 are repeated, the refrigerant in the suction space 101 introduced into the suction port 114 is sucked into the compression chamber P and compressed, and the discharge space 102 and the discharge tube 111 And a refrigerant flow discharged to the outside of the compressor through the discharge port may be formed.

At this time, the refrigerant passing through the suction port 114 and the suction guide 112 may flow into the compression chamber P via the muffler 170 . The muffler 170 may be configured to reduce vibration and noise caused by the reciprocating motion of the piston 142 while guiding the refrigerant into the compression chamber P. The muffler 170 includes an outer body 171 and an inner body 172 that are disposed parallel to the suction guide 112 and coupled to each other to be fixed to the end of the piston 142, and extends to be inserted into the piston. A pipe part 173 may be provided.

In the above, the schematic structure and operation process of the linear compressor 100 according to the present invention has been described. Hereinafter, the stator 131 of the linear compressor 100 according to the present invention made to reduce core loss will be described.

FIG. 2 is a cross-sectional view of the stator 131 shown in FIG. 1 . Referring to FIG. 2, in one embodiment of the present invention, the stator 131 is disposed on the path of magnetic flux formed by the winding coil 133, and in particular, the easy direction of magnetization is uniformly distributed. At least one directional core part 131c formed to be formed is provided.

The direction of easy magnetization means a direction in which a material is particularly easily magnetized when it is magnetized in a magnetic field. When the same power is input, when the direction of the magnetic flux formed in the stator 131 and the direction of easy magnetization coincide, a greater electromagnetic force can be generated than otherwise. Therefore, when the direction of easy magnetization and the direction of magnetic flux coincide with each other, core loss, which is energy loss in the process of magnetizing the stator 131 by the magnetic field, can be further reduced.

The oriented core portion 131c may be formed of grain-oriented electrical steel when the stator 131 is manufactured. Non-oriented electrical steel, which is the material of the iron core of the conventional stator 131, has uniform magnetic properties regardless of the rolling direction or other directions. Unlike this, the grain-oriented electrical steel sheet is characterized in that the direction of easy magnetization of the crystal is formed parallel to the direction in which the steel sheet is rolled, and has an advantage of having a small core loss when magnetized in the rolling direction.

In this way, when core loss is reduced as a part of the stator 131 is formed of the directional core portion 131c, the efficiency of the drive unit 130 that converts electrical energy into rotational force can be improved. By improving the efficiency of the drive unit 130, the overall efficiency of the linear compressor 100 according to the present invention can be improved.

Hereinafter, with reference to FIG. 2 , the specific shape and arrangement of the directional core part 131c will be described.

As described above, the stator 131 of the linear compressor 100 according to the present invention may include an inner core 131b and an outer core 131a, and between the inner core 131b and the outer core 131a A void (G) is formed. Here, the directional core part 131c of this embodiment may form the outer core 131a.

Specifically, the directional core portion 131c may include a pair of radial core portions 131c1 and a reciprocating core portion 131c2. The pair of radial core portions 131c1 are spaced apart from each other with the winding coil 133 interposed therebetween, and are formed to extend in the radial direction of the cylinder 141 . Further, the direction of easy magnetization of the radial core portion 131c1 may be formed parallel to the radial direction of the cylinder 141 (a vertical direction in FIG. 2 ). At this time, the space between the pair of radial core portions 131c1 spaced apart from each other may be a coil accommodating portion 131e in which the winding coil 133 is mounted.

In addition, the reciprocating core portion 131c2 may connect the pair of radial core portions 131c1 to each other in the reciprocating direction of the piston 142. That is, both ends of the reciprocating core portion 131c2 may be respectively connected to outer circumferential ends of the pair of radial core portions 131c1. In particular, the direction of easy magnetization of the reciprocating direction core part 131c2 may be formed parallel to the reciprocating direction of the piston 142 (left-right direction in FIG. 2). Here, the reciprocating core portion 131c2 may be formed to surround the outer circumferential side of the winding coil 133 .

As a result, in the outer core 131a forming the coil accommodating portion 131e, the direction of easy magnetization may be distributed so as to extend along the outer circumferential side adjacent to the winding coil 133 and both ends in the reciprocating direction of the piston 142. .

3A and 3B are diagrams showing the path of magnetic flux formed in the stator 131 shown in FIG. 2 according to the position of the mover 132. Referring to FIGS. 3A and 3B , it can be confirmed that the magnetic flux path formed in the outer core 131a changes according to the moving direction of the mover 132 . However, in the radial core portion 131c1 and the reciprocating core portion 131c2 of the outer core 131a, a distribution in which magnetic flux directions alternately change only in opposite directions is shown.

That is, unlike the magnetic flux distribution of the part spaced apart from the inner core 131b and forming the air gap G, which changes at various angles depending on the position of the mover 132, the radial and reciprocating core parts 131c1 and 131c2 In the winding coil 133, the direction of the magnetic flux may be changed alternately in a clockwise direction and a counterclockwise direction, opposite to each other.

Here, the air gap forming part 131a1 spaced parallel to the inner core 131b is a part where the direction of magnetic flux changes at various angles, and is parallel to the reciprocating direction core part 131c2 with the winding coil 133 interposed therebetween. can be spaced apart. The gap forming portion 131a1 may be formed of a non-oriented electrical steel sheet, which is a conventional material. That is, the void forming portion 131a1 may be made of a material in which the crystals have irregular directions of easy magnetization.

As shown in FIGS. 2, 3A and 3B, by applying the directional core part 131c to a part of the outer core 131a, core loss generated in the process of repeatedly magnetizing the stator 131 can be effectively reduced. . In particular, as a regular direction of easy magnetization is given by avoiding the air gap forming part 131a1 among the outer core 131a, the core loss reduction effect according to the application of the directional core part 131c can be maximized.

Meanwhile, hereinafter, a structure of a portion where the radial core portion 131c1 and the reciprocating core portion 131c2 are coupled to each other will be described.

In the present embodiment, the pair of radial core portions 131c1 may have a pair of inclined surfaces 131c1' inclined in opposite directions so as to face each other at their outer peripheral end (upper end in FIG. 2). can That is, the pair of inclined surfaces 131c1' may be formed to be inclined with the easy magnetization direction of the radial core portion 131c1.

Correspondingly, the reciprocating direction core part 131c2 may have an inclined coupling surface 131c2'. The inclined coupling surface 131c2' may be inclined at both ends of the reciprocating core part 131c2 so as to come into surface contact with the pair of inclined surfaces 131c1' of the radial core part 131c1.

The pair of inclined surfaces 131c1' and the inclined coupling surface 131c2' coupled thereto are formed, so that the reciprocating direction core part 131c2 and the pair of radial core parts 131c1 are connected to each other in the direction of easy magnetization. This abrupt change can be suppressed, and core loss can be reduced. Furthermore, in the coupling between the radial and reciprocating core portions 131c1 and 131c2, a wide cross-sectional area of the coupling surface can be secured, so that durability of the coupling can be further guaranteed.

On the other hand, FIG. 4 is a cross-sectional view of a stator 231 according to another embodiment of the present invention. 4 shows an embodiment in which the directional core portion 231c is further subdivided.

Referring to FIG. 4 , in this embodiment, outer circumferential ends of the pair of radial core portions 231c1 may be formed as faces facing the radial direction of the cylinder 141 in parallel with each other. However, the directional core part 231c may further include a pair of connection core parts 231c3. The pair of connection core parts 231c3 may be coupled to the outer peripheral side ends of the pair of radial core parts 231c1, respectively, and may be formed with an inclined direction of easy magnetization. Specifically, the easy magnetization direction of the pair of connection core parts 231c3 may be inclined in opposite directions to the easy magnetization direction of the pair of radial core parts 231c1.

In addition, a reciprocating direction core part 231c2 may be connected between the pair of connection core parts 231c3 of this embodiment. That is, the connection core part 231c3 may be coupled to both ends of the reciprocating direction core part 231c2.

According to another embodiment of FIG. 4 , the easy magnetization direction may be more consistent with the magnetic flux distribution at the corner portion surrounding the winding coil 133 in the outer core 231a. Accordingly, there is room for the core loss to be further reduced than in the previous embodiment. In one embodiment and other embodiments of the present invention, when a bonding structure is added to the outer core 231a, the effect on strength and the level of core loss reduction can be compared with each other and used in design.

Meanwhile, when the stator 131 of the linear compressor 100 according to the present invention is formed by laminating electrical steel sheets, the stator 131 includes a non-oriented core portion 131d made of non-oriented electrical steel sheets and a grain-oriented electrical steel sheet. It may be made of a directional core portion (131c) made.

The non-directional core part 131d may form the above-described void forming part 131a1 of the outer core 131a and the inner core 131b. The gap forming part 131a1 and the inner core 131b may be spaced parallel to each other to form a gap G. The non-directional core part 131d corresponds to an area where the distribution of magnetic flux can be variously changed according to the position of the mover 132 and the direction of thrust.

As described above, the directional core portion 131c may form radial and reciprocating core portions 131c1 and 131c2 of the outer core 131a. The directional core part 131c may form a coil accommodating part 131e accommodating the winding coil 133 so as to surround it, and may correspond to a region in which magnetic flux directions are alternately changed in opposite directions.

In other words, the pair of radial core portions 131c1 may be spaced apart from each other with the winding coil 133 interposed therebetween and may extend in the radial direction of the cylinder 141 from the non-directional core portion 131d. The radial core portion 131c1 may be formed by stacking grain-oriented electrical steel sheets so that the rolling direction is parallel to the radial direction of the cylinder 141 .

In addition, the reciprocating core portion 131c2 extends to connect the pair of radial core portions 131c1 to each other in the reciprocating direction of the piston 142, and the rolling direction is formed parallel to the reciprocating direction of the piston 142. Grain-oriented electrical steel sheets to be manufactured may be formed by being laminated.

What has been described above is only the embodiments for implementing the linear compressor according to the present invention, and the present invention is not limited to the above embodiments, and does not depart from the gist of the present invention as claimed in the following claims. Anyone with ordinary knowledge in the field to which the invention pertains within the technical spirit of the present invention to the extent that various changes can be made.

100: linear compressor 101: suction space
102: discharge space 110: casing
111: discharge tube 112: suction guide
114: inlet 121: front frame
122: rear frame 123: cover member
130: drive unit 131: stator
131a: outer core 131a1: gap forming part
131b: inner core 131c: directional core part
131c1: radial core portion 131c2: reciprocating core portion
131d: non-directional core part 131e: coil accommodating part
132: mover 133: winding coil
140: compression unit 141: cylinder
142: piston 142a: suction port
142b: intake valve 143: discharge valve
144: discharge cover 145: moving frame
146: connecting member 150: support spring
160: resonance spring 170: muffler
171: outer body 172: inner body
173: pipe part

Claims (9)

casing;
a drive unit having a mover reciprocating within the casing, a stator generating electromagnetic force in the reciprocating direction to drive the mover, and a winding coil; and
A compression unit including a cylinder accommodated inside the casing and a piston reciprocating in the cylinder by the mover to compress the fluid in the cylinder,
The stator is
non-directional cores spaced apart from each other in the radial direction of the cylinder to form an air gap accommodating the mover and made of a non-directional material;
A linear compressor comprising: a directional core portion connected to the non-directional core portion to form a coil accommodating portion accommodating the winding coil and made of a directional material. According to claim 1,
The directional core part is disposed on a path of magnetic flux formed by the winding coil so that an easy direction of magnetization is uniformly distributed. According to claim 1,
The stator is
an inner core fixed to an outer circumferential surface of the cylinder; and
A linear compressor comprising an outer core spaced apart from the inner core in a radial direction of the cylinder to form an air gap accommodating the mover, and having the directional core portion. According to claim 3,
The directional core part includes a pair of radial core parts spaced apart from each other with the winding coil therebetween, extending in the radial direction of the cylinder, and having a direction of easy magnetization parallel to the radial direction of the cylinder. Linear compressor. According to claim 4,
The directional core part further includes a reciprocating direction core part extending to connect the pair of radial core parts to each other in the reciprocating direction of the piston and having a direction of easy magnetization parallel to the reciprocating direction of the piston. Linear compressor. According to claim 5,
The pair of radial core portions have a pair of inclined surfaces inclined in opposite directions to face each other at the outer circumferential end,
The reciprocating direction core part has inclined coupling surfaces formed at both ends so as to be coupled to the pair of inclined surfaces in surface contact with the linear compressor. According to claim 4,
The directional core part,
a pair of connecting core parts coupled to outer circumferential ends of the pair of radial core parts and inclined in directions opposite to each other with respect to the easy magnetization direction of the pair of radial core parts; and
The linear compressor further comprises a reciprocating direction core portion extending to connect the pair of connecting core portions to each other in a reciprocating direction of the piston and having an easy magnetization direction parallel to the reciprocating direction of the piston. According to claim 1,
The oriented core part is made of a grain oriented electrical steel sheet,
The non-oriented core part is a linear compressor, characterized in that made of a non-oriented electrical steel sheet. According to claim 8,
The directional core part,
a pair of radial core portions spaced apart from each other with the winding coil interposed therebetween, extending in a radial direction of the cylinder from the non-directional core portion, and having a rolling direction parallel to the radial direction; and
A linear compressor having a reciprocating direction core portion extending to connect the pair of radial core portions to each other in a reciprocating direction of the piston and having a rolling direction parallel to the reciprocating direction of the piston.

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