KR100615798B1 - Inner stator maounting for linear compressor - Google Patents

Abstract

The present invention relates to an inner stator fixing structure of a linear compressor installed on an outer circumferential surface of a cylinder such that a linear motor including an inner stator, an outer stator and a permanent magnet is connected to a piston inserted into the cylinder. Even if the shape of the fixing ring installed between one end surface of the inner stator and the outer peripheral surface of the cylinder is deformed, the assembly ring can be maintained and its width can be reduced, thereby preventing the fixing ring from interfering with the inner stator and the cylinder. In addition to improving the performance, the gap between the inner stator and the cylinder can be reduced, which reduces the overall size of the product.

Linear compressor, cylinder, linear motor, inner stator, retaining ring, hole

Description

Inner stator fixing structure of linear compressor {INNER STATOR MAOUNTING FOR LINEAR COMPRESSOR}             

1 is a side cross-sectional view showing a linear motor of a general linear compressor;

2 is a plan view showing a fixing ring used in the inner stator fixing structure according to the prior art,

3 is a plan view showing a fixing ring used in the inner stator fixing structure according to the present invention.

<Explanation of symbols on main parts of the drawings>

2: cylinder 2h: cylinder groove

12: inner stator 12h: inner stator home

50: retaining ring 52, 54: both ends

52h, 54h: Supporting holes

The present invention relates to an inner stator fixing structure of a linear compressor installed on an outer circumferential surface of a cylinder such that a linear motor including an inner stator, an outer stator and a permanent magnet is connected to a piston inserted into the cylinder, and in particular, to fix the inner stator to the cylinder. The present invention relates to an inner stator fixing structure of a linear compressor capable of maintaining assembly strength and reducing its width even when the shape of the fixing ring installed between one end surface of the inner stator and the cylinder outer circumferential surface is deformed.

In general, a compressor is a mechanical device that increases pressure by receiving power from a power generator such as an electric motor or a turbine to compress air, refrigerant, or various other working gases. It is widely used throughout.

These compressors are classified into a reciprocating compressor which compresses the refrigerant while linearly reciprocating the inside of the cylinder by forming a compression space in which the working gas is absorbed and discharged between the piston and the cylinder. And a rotary compressor for compressing the refrigerant while the roller is eccentrically rotated along the inner wall of the cylinder to form a compression space in which the working gas is sucked and discharged between the eccentrically rotating roller and the cylinder. As a scroll compressor that compresses the refrigerant while the rotating scroll rotates along the fixed scroll to form a compression space in which the working gas is absorbed and discharged between the orbiting scroll and the fixed scroll. Divided.

Recently, among the reciprocating compressors, in particular, a piston is directly connected to a reciprocating linear drive motor, so that there is no mechanical loss due to the motion conversion, thereby improving the compression efficiency, and many linear compressors having a simple structure have been developed.

Normally, a linear compressor is configured to suck and compress refrigerant and then discharge the refrigerant while the piston is moved reciprocally linearly in the cylinder by the linear motor inside the closed shell, the linear motor being permanent between the inner and outer stators. The magnets are positioned so that the permanent magnets are linearly reciprocated by mutual electromagnetic forces. As the permanent magnets are driven in connection with the pistons, the pistons reciprocate linearly inside the cylinders to inhale and compress the refrigerant, and then discharge them. To do that.

1 is a side sectional view showing a linear motor of a general linear compressor.

In general, as shown in FIG. 1, the linear compressor has a piston 4 installed inside the cylinder 2 to reciprocate linearly, and sucks the refrigerant into the compression space P therebetween to compress and then discharge the refrigerant. It is configured, the piston 4 is connected to the linear motor 10 installed inside the cylinder (2) is driven to reciprocate linear motion.

Of course, a suction hole 4h is formed at one end of the piston 4 to suck the refrigerant into the compression space P, and a thin suction valve 6 is installed to open and close at the suction hole 4h. The discharge valve 8a is installed to open and close at one end of the cylinder 2 so that the refrigerant compressed in the compression space P may be discharged, and the discharge cap 8b fixed to the end of the cylinder 2 is fixed. It is installed to be elastically supported by the spiral discharge valve spring 8c inside.

Here, the linear motor 10 is positioned at a predetermined interval on the outer peripheral surface of the cylindrical inner stator 12 and the outer circumferential surface of the inner stator 12 in which a plurality of laminations are laminated in the circumferential direction so as to be fixed to the outer peripheral surface of the cylinder 2. A gap between the outer stator 14 and the outer stator 14 and the outer stator 14 provided with a pair of core blocks 14b and 14b 'disposed at a predetermined interval in the circumferential direction such that the coil winding 14a is disposed. It is installed in the axial direction in the axial direction is composed of a permanent magnet 16 reciprocating linear movement by mutual electromagnetic force between the inner stator 12 and the outer stator 14, the outer stator 14 is the coil winding In the state in which the core blocks 14b and 14b 'are assembled on the outer circumferential surface of the hull 14a, the injection molding 24 is injection molded along the outer circumferential surface to be fixed to each other.

At this time, one end of the cylinder (2) is fitted and fixed to the body frame (3) while one end of the piston (4) is fitted inside the cylinder (2), and one end of the inner stator (12) is also the main body. A fixing ring R is interposed between the other end surface of the inner stator 12 and the outer circumferential surface of the cylinder 2 while being supported by the frame 3 to fix the inner stator 12 to the cylinder 2. However, a ring-shaped cylinder groove 2h is formed on the outer circumferential surface of the cylinder 2, and a stepped ring-shaped inner stator groove 12h is formed on the other end surface of the inner stator 12, and the cylinder groove (2h) and the inner stator groove (12h) is fitted so that the fixing ring (R) is over.

In addition, the permanent magnet 16 is connected to the other end of the piston (4) by the stepped connecting member 22 is installed with a predetermined gap on the outer circumferential surface of the inner stator 12, then the outer stator 14 of The motor cover is supported by the main body frame 3 in a state where both ends thereof are supported between the main body frame 3 on which one end of the cylinder 2 is fixed and a motor cover (not shown) located on the other end side of the cylinder 2. It is fixed to be screwed on.

In the linear compressor configured as described above, when a current flows along the coil winding 14a, the permanent magnet 16 moves reciprocally linearly by the electromagnetic force with the inner stator 12 and the outer stator 14. Accordingly, the piston 4 also reciprocates linearly, while the suction valve 6 and the discharge valve 8a are opened and closed according to the pressure of the compression space P, thereby sucking and compressing the refrigerant, and then discharging the refrigerant.

2 is a plan view showing a fixing ring used in the inner stator fixing structure according to the prior art.

Looking at the fixing ring used in the conventional inner stator fixing structure in more detail with reference to Figure 2 in the linear compressor configured as described above, the fixing ring 30 is formed as a kind of 'C' ring to act the elastic force in the center direction At the same time, both ends 32 and 34 are formed to be separated from each other, and circular supporting holes 32h and 34h are formed in the center thereof, and tools are inserted into the supporting holes 32h and 34h to oppose each other. Let force be applied in the circumferential direction of.

In this case, the supporting holes 32h and 34h are manufactured by punching the central portions of the both ends 32 and 34 in a circular shape, and the supporting holes 32h and 34h are formed in a circular shape. In order to maintain the strength for drilling the support holes 32h and 34h, the widths of both ends 32 and 34 should be at least three times greater than the diameter 2t of the support holes 32h and 34h, respectively. To be located at a predetermined interval in the circumferential direction from both ends (32, 34).

Of course, the inner diameter of the fixing ring 30 is formed smaller than the diameter of the cylinder groove (2h) as well as the outer diameter of the fixing ring 30 is formed smaller than the diameter of the inner stator groove (12h) The fixing ring 30 is sandwiched between the cylinder groove (2h) and the inner stator groove (12h) to secure the inner stator (12) to the cylinder (2) while acting elastic force in the center direction .

However, the inner stator fixing structure of the linear compressor according to the prior art inserts the fixing ring to span the cylinder groove (2h) formed on the outer peripheral surface of the cylinder (2) and the inner stator groove (12h) formed on one end surface of the inner stator (12). The widths of both ends 32 and 34 of the support holes 32h and 34h are formed to form circular support holes 32h and 34h into which the tool is inserted into both ends 32 and 34 of the fixing ring. It should be maintained at least three times larger than the diameter of the, so that the entire fixing ring 30 is inserted into the cylinder groove (2h) and the inner stator groove (12h) both ends (32, 34) of the fixing ring The cylinder grooves 2h and the inner stator grooves 12h interfere with each other and are difficult to assemble.

Of course, in order to solve the above problems, the cylinder groove 2h and the inner stator groove 12h may be made larger in consideration of the widths of both ends 32 and 34 of the fixing ring. As the cylinder grooves 2h and the inner stator grooves 12h increase in size depending on the size of both ends 32 and 34 of the ring, the thickness of the cylinder 2 increases as well as the inner stator 12 becomes larger. There is a problem that not only increases the material cost to increase but also the size of the product.

The present invention has been made to solve the above problems of the prior art, even if the support holes are formed at both ends of the fixing ring to reduce the width while maintaining the strength of the fixing ring between the cylinder and the inner stator It is an object of the present invention to provide an inner stator fixing structure of a linear compressor that can be easily assembled.

The present invention for solving the above problems is fixed to the outer circumferential surface of the cylinder and a plurality of laminations are laminated in the circumferential direction, and the coil is wound in the circumferential direction is located at a predetermined interval outside the inner stator Core blocks, in which a plurality of laminations are stacked in the circumferential direction, are installed between the outer stator installed at regular intervals in the circumferential direction and the inner stator and the outer stator so as to connect to the piston located inside the cylinder, so that current is applied to the coil. In the linear motor of the linear compressor comprising a permanent magnet reciprocating linearly in the axial direction by mutual electromagnetic force with the outer stator and the inner stator in accordance with the flow, the first surface of the inner stator is stepped ring shape Fixing groove and abutting cylinder The inner diameter of the inner stator is smaller than the outer diameter of the cylinder so as to be installed between the second fixing groove formed in a ring shape on the outer circumferential surface and the first and second fixing grooves to fix the inner stator to the cylinder. A larger outer diameter is formed so that a part of the fixed ring is cut in the circumferential direction, and formed to open in opposite directions to the cut ends of the fixed ring so that a tool is inserted to apply a force in the circumferential direction to both ends of the fixed ring. Provided is an inner stator fixing structure of a linear compressor including a pair of supporting holes that can open a stage in a circumferential direction.

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

3 is a plan view showing a fixing ring used in the inner stator fixing structure according to the present invention.

Looking at the fixing ring used in the inner stator fixing structure of the linear compressor according to the present invention with reference to Figure 3, the fixing ring 50 is also the elastic force toward the center by the 'C' ring with both ends 52, 54 open In this case, support holes 52h and 54h are formed to be opened in opposite directions so that a tool is inserted into both ends 52 and 54 so that a force can be applied in opposite circumferential directions.

Here, both ends 52 and 54 are formed to be thicker than other portions of the fixing ring 50 so as to maintain strength even when the supporting holes 52h and 54h are formed. 52h and 54h are manufactured by punching the center portions of both ends 52 and 54 to open in a semicircular shape, and may be manufactured in various shapes so that the tool is inserted and supported in the circumferential direction.

In this case, the support holes 52h and 54h are formed to be open at both ends 52 and 54, so that the support holes 52h and 54h are formed inside the both ends 52 and 54. Since the strength required in the fabrication process is small, the widths of the both ends 52 and 54 can be formed relatively small. Usually, the widths of the both ends 52 and 54 are formed in the support holes 52h and 54h. Even if only two times larger than the diameter (2t) can maintain the strength required in the manufacturing process.

Of course, the inner diameter of the fixing ring 50 is formed smaller than the diameter of the cylinder groove (2h) as well as the outer diameter of the fixing ring 50 is formed smaller than the diameter of the inner stator groove (12h) The fixing ring 50 is sandwiched between the cylinder groove (2h) and the inner stator groove (12h) while the elastic force acts in the center direction to fix the inner stator (12h) to the cylinder (2). .

Therefore, even if the widths of both ends 52 and 54 of the fixing ring are larger than other portions, the supporting holes 52h and 54h are formed to be open to both ends 52 and 54 of the fixing ring. Therefore, the width required at the time of design can be reduced, so that the width of both ends of the fixing ring 52 and 54 of the present invention can be kept smaller than the width of both ends of the conventional fixing ring, and the cylinder groove into which the fixing ring 50 is inserted ( 2h) and the inner stator groove 12h can also be reduced in size.

In this case, reference numerals not shown refer to FIG. 1.

Looking at the process of fixing the inner stator 12 using the fixing ring 50 configured as described above, one end of the inner stator 12 by inserting the inner stator 12 into the outer peripheral surface of the cylinder (2) It is installed to be supported by the main body frame 3, the inner stator groove 12h formed at the other end of the inner stator 12 and the cylinder groove 2h formed at the outer peripheral surface of the cylinder 2 are in the same phase in the axial direction. Is located.

Next, the tool is inserted into the supporting holes 52h and 54h of the fixing ring so that the fixing ring 50 can be inserted between the cylinder groove 2h and the inner stator groove 12h. The two ends 52 and 54 are applied to the opposite circumferential direction so that the two ends 52 and 54 are open to each other, and the fixing ring 50 having the increased inner diameter is the outer peripheral surface of the cylinder 2. It is fitted in the cylinder groove (2h) formed in the groove and the inner stator groove (12h) formed on the other end surface of the inner stator (12).

Next, when the tool is removed from the supporting holes 52h and 54h of the fixing ring so that the fixing ring 50 acts as an elastic force in the center direction, the inner circumferential end of the fixing ring 50 is formed in the cylinder groove ( 2h) and the outer circumferential end of the fixing ring 50 is engaged with the inner stator groove 12h so that the inner stator 12 is fixed to the outer circumferential surface of the cylinder 2.

In the above, the present invention has been described in detail by way of examples based on the embodiments of the present invention and the accompanying drawings. However, the scope of the present invention is not limited by the above embodiments and drawings, and the scope of the present invention will be limited only by the contents described in the claims below.

The inner stator fixing structure of the linear compressor according to the present invention configured as described above is formed so that the support holes are opened at opposite ends of the fixing ring in directions opposite to each other, so that the width thereof can be reduced while maintaining the strength thereof. The grooves formed in the cylinder and the inner stator to be easily installed as the fixing ring is installed between the inner stator and the width of both ends are reduced, and furthermore, as the width of both ends of the fixing ring is reduced. In addition, the size can be reduced, thereby reducing the size of each component to reduce the production cost, as well as the overall size of the product has the advantage.

Claims (3)

A ring-shaped inner stator fixed to the outer circumferential surface of the cylinder and having a plurality of laminations stacked in the circumferential direction; An outer stator positioned at a predetermined interval outside the inner stator and having core blocks stacked in a circumferential direction with a plurality of laminations circumferentially wound around the coil wound in the circumferential direction; The permanent magnet is installed between the inner and outer stator so as to connect with the piston located inside the cylinder, and the permanent magnet reciprocates linearly in the axial direction by mutual electromagnetic force with the outer stator and the inner stator as current flows in the coil. In the linear motor of the linear compressor including, A first fixing groove having one end surface of the inner stator formed in a ring shape and a second fixing groove formed in a ring shape on an outer circumferential surface of the cylinder in contact with the inner stator; It is installed between the first and second fixing grooves so that the inner diameter is smaller than the outer diameter of the cylinder so that the inner stator can be fixed to the cylinder, and the outer diameter is larger than the inner diameter of the inner stator, so that some sections are cut in the circumferential direction. Fixed ring, It is formed of a pair of supporting holes that are formed to open in the direction opposite to each other on the cut ends of the fixing ring is inserted into the tool to apply a force in the circumferential direction to open both ends of the fixing ring in the circumferential direction Inner stator fixing structure of a linear compressor. The method of claim 1, The supporting holes are fixed to the inner stator of the linear compressor, characterized in that formed in the center of both ends of the fixing ring. The method according to claim 1 or 2, The support holes are fixed in the inner stator structure of the linear compressor, characterized in that formed in a semicircular shape.

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