KR100459461B1 - Two stage reciprocating compressor - Google Patents

Abstract

The present invention relates to a reciprocating compressor, and the present invention provides a reciprocating compressor by installing one reciprocating motor in a casing and coupling the pistons of the first compression unit and the second compression unit to the movers of the reciprocating motor, respectively. The same motor can drive two compressors at the same time, and by arranging the compression stroke and the suction stroke of the two compressors alternately, it is possible to operate the high compression ratio with one compressor, thereby reducing the number of parts or assembly of the compressor. In addition, when the refrigerator or the like is installed, the installation space of the compressor can be reduced, and thus the refrigerator itself can be miniaturized.

Description

Two Stage Reciprocating Compressor {TWO STAGE RECIPROCATING COMPRESSOR}

The present invention relates to a reciprocating compressor, and more particularly, to a two-stage reciprocating compressor capable of compressing a refrigerant in two stages by continuously connecting two compressor mechanisms to one power mechanism.

In general, a compressor converts mechanical energy into compressive energy of a compressive fluid, and is generally classified into reciprocating type, scroll type, centrifugal type, and vane type.

Of these, reciprocating compressors are known to compress refrigerants in multiple stages by connecting a plurality of compressors in series in the case of refrigerants requiring high compression ratio operation such as carbon dioxide in response to the recent increase in size of refrigerators. The increased and wider installation space is required, which leads to an increase in the size of the refrigerator. Therefore, it is necessary to provide a reciprocating compressor that is capable of operating a high compression ratio but is inexpensive and does not require a large installation space.

1 is a longitudinal sectional view showing an example of a conventional reciprocating compressor.

As shown in the drawing, the conventional reciprocating compressor includes a casing 10 for communicating the gas suction pipe SP and the gas discharge pipe DP, and a frame unit 20 elastically supported inside the casing 10. And a reciprocating motor 30 supported by the frame unit 20 and fixed to the inside of the casing 10, and a compression unit supported by the frame unit 20 by being mechanically connected to the reciprocating motor 30 ( 40 and a resonant spring unit 50 for elastically supporting the reciprocating motor 30 to induce resonance.

The frame unit 20 includes a front frame 21 supporting the cylinder 41 and the piston 42 of the compression unit 40 together, and an intermediate unit coupled to the front frame 21 to receive and protect the compression unit 40. It consists of a frame 22 and a rear frame 23 supporting the outer stator 31 and the inner stator 32 with the outer stator 31 of the reciprocating motor 30 interposed between the frame 22 and the intermediate frame 22. have.

The reciprocating motor 30 includes an outer stator 31 fixed between the intermediate frame 22 and the rear frame 23, and an inner stator 32 positioned inside the outer stator and inserted into and fixed to the rear frame 23. And a mover 33 interposed between the outer stator 31 and the inner stator 32 to reciprocate linearly in the direction of the flux.

The compression unit 40 is inserted into the front frame 21 and fixed to or integrally formed with the cylinder 41 (shown in the drawing to fix the insertion method) 41 and the mover 33 of the reciprocating motor 30. A piston 42 for sucking and compressing a fluid while linearly reciprocating in a compression space P of the cylinder 41 by coupling and a suction flow path F to be described later are mounted on the end surface of the piston 42. A suction valve 43 which opens and closes, and a discharge valve assembly 44 mounted on the discharge side of the cylinder 41 to limit discharge of the compressed gas.

The resonant spring unit 50 is coupled to both sides of the spring support 51 which is engaged with the mover 33 and the piston 42 of the reciprocating motor 30, respectively, and the mover 33 and the piston described above. Inducing resonant motion of (42) consists of a front coil spring (52) formed by a compression coil spring and arranged on the piston 42 side, and a rear resonance spring (53) disposed on the motor (30) side.

The conventional reciprocating compressor as described above operates as follows.

That is, when power is applied to the outer stator 31 of the reciprocating motor 30, a flux is formed between the outer stator 31 and the inner stator 32 to form the movable element 33 and the piston 42. ) Move together in the direction of the flux, and at the same time the pressure difference in the compression space P of the cylinder 41 while the piston 42 reciprocates linearly inside the cylinder 41 by the spring unit 50. It was to repeat the series of processes to inhale the refrigerant gas into the compression space (P) by the above to compress and discharge to a predetermined pressure.

However, in the conventional reciprocating compressor as described above, when the high compression ratio operation is required, as shown in FIG. 2, the electric mechanism unit and the compression mechanism unit are separately provided on the discharge side of the first compressor C1 including the electric mechanism unit and the compression mechanism unit. When the inlet side of the second compressor C2 is connected in series, the first compressor C1 compresses the refrigerant in one stage, and then discharges the refrigerant to the inlet side of the second compressor C2. One refrigerant was compressed again in two stages and completely discharged. However, as described above, the first compressor C1 is equipped with an electric mechanism part and a compression mechanism part in separate casings 10 and 10 for high compression ratio operation. Since the second compressor (C2) and the second compressor (C2) to increase the cost of itself as well as the pipe (60) connecting the two compressors (C1) (C2) is required to increase the cost of the parts and the assembly cost for assembling them there was. In addition, since a plurality of compressors (C1) and (C2) must be installed in a refrigerator or the like, the required space in the machine room for installing the compressor or the like in the refrigerator increases, so that the relatively high effective area is narrowed, which makes the refrigerator inefficient. There was a problem.

The present invention has been made in view of the problems of the conventional reciprocating compressor as described above, and can solve various problems such as cost and space compared to having a plurality of compressors by allowing a single compressor to operate a high compression ratio. It is an object of the present invention to provide a two-stage reciprocating compressor.

1 is a longitudinal sectional view showing an example of a conventional reciprocating compressor.

Figure 2 is a longitudinal sectional view showing a state in which a conventional reciprocating compressor is arranged in a two-stage compression type.

Figure 3 is a longitudinal sectional view showing an example of the present invention two-stage reciprocating compressor.

Figure 4 is a detailed view showing a coupling state of the magnet frame and the first cylinder in FIG.

5 and 6 are longitudinal cross-sectional view showing a compression process of the present invention a two-stage reciprocating compressor step by step.

** Description of symbols for the main parts of the drawing **

110: casing 120: frame unit

121a: cylinder hole 121b: gas outlet

130: reciprocating motor 131: stator

132: mover 132A: magnet frame

132a: locking projection 140: first compression unit

141: first cylinder 142: first piston

143: first intake valve 144: first discharge valve assembly

144A: first discharge valve 144B: first valve spring

150: second compression unit 151: second cylinder

152: second piston 153: second suction valve

154: second discharge valve assembly 154A: second discharge valve

154B: second valve spring 160: resonant spring unit

161A: front support protrusion 161B: rear support protrusion

162: front side resonance spring 163: rear side resonance spring

S1, S3: first and second compression spaces S2, S4: second and fourth compression spaces

SP: Gas suction pipe DP: Gasoline discharge pipe

In order to achieve the object of the present invention, a casing having a gas suction pipe and a gas discharge pipe; A frame unit fixed inside the casing; A reciprocating motor for reciprocating motion comprising a stator fixed to the frame unit and a mover inserted to reciprocate linearly inside the stator; The first gas passage is coupled to the mover of the reciprocating motor to reciprocate linearly together with the first cylinder and slides into the first compression space of the first cylinder to be fixed to the casing and communicate with the gas suction pipe. A first piston to be formed, a first suction valve mounted on the front end face of the first piston to open and close the first gas flow path, and a first discharge valve disposed on the front end face of the first cylinder to open and close the first compression space. A first compression unit comprising; A second cylinder integrally or post-assembled to the frame unit to communicate with the gas discharge pipe, a second piston mechanically coupled to the mover of the reciprocating motor to reciprocate linearly in the compression space of the second cylinder; A second intake valve mounted on the front end surface of the second piston to open and close the second gas flow path formed on the second piston, and a second discharge valve disposed on the front end surface of the second cylinder to open and close the second compression space. A second compression unit comprising; It provides a two-stage reciprocating compressor comprising: a resonant spring unit including a front resonant spring and a rear resonant spring to support the frame unit to induce the resonant motion of the mover, the first cylinder, and the second piston. .

Hereinafter, a two-stage reciprocating compressor according to the present invention will be described in detail with reference to one embodiment shown in the accompanying drawings.

Figure 3 is a longitudinal cross-sectional view showing an example of the two-stage reciprocating compressor of the present invention, Figure 4 is a detailed view showing a coupling state of the magnet frame and the first cylinder in Figure 3, Figure 5 and 6 is a two-stage reciprocating of the present invention Longitudinal cross-sectional view showing the compression process of a compressor.

As shown in the drawing, the reciprocating compressor of the present invention includes a casing 110 for communicating the gas suction pipe SP and the gas discharge pipe DP, a frame unit 120 fixedly installed in the casing 110, and a frame. A reciprocating motor 130 which is supported by the unit 120 and the movable element 133 reciprocates linearly, and connected to the movable element 132 of the reciprocating motor 130 to reciprocate linearly together A first compression unit 140 for compressing refrigerant gas in one stage, including a first cylinder 141 and a first piston 142 fixed to the casing 110 so as to slide into the cylinder 141, and a frame unit; Mechanically connected to the second cylinder 151 fixed to the 120 and the mover 132 of the reciprocating motor 130 to reciprocate in the second cylinder 151, the first stage compressed refrigerant gas is 2 However, the second compression unit 150 to compress and the reciprocating motor 130 is elastically supported to induce a resonant motion Constitute a resonance spring unit (160).

The frame unit 120 is fixed to the outlet side of the casing 110 so as to be connected to the gas discharge pipe DP of the casing 110 to support the second cylinder 151 and the front frame 121 and the front frame ( The intermediate frame 122 supporting one side of the stator 131 of the reciprocating motor 130 by being fixed to the casing 110 at a predetermined distance from the 121 and the intermediate frame 122 of the reciprocating motor 130 together with the intermediate frame 122. The stator 131 is formed of a rear frame 123 supporting the other side.

The front frame 121 forms a cylinder hole 121a for inserting the second cylinder 151 in the center thereof, and forms a gas outlet port 121b for continuously inserting the gas discharge pipe into the cylinder hole. A second discharge space S4 between the cylinder hole 121a and the gas discharge pipe DP, which accommodates the second discharge valve 154A and the second valve spring 154B, which will be described later, and opens and closes the second discharge valve 154A. ). The inner diameter of the gaseous outlet 121b is preferably smaller than the inner diameter of the second discharge space S4.

The intermediate frame 122 and the rear frame 123 are both formed in an annular shape to be press-fitted into the casing 110 by shrink fit or fixed by welding after insertion.

The reciprocating motor 130 has a stator 131 and a stator 131 for laminating a thin plate in a cylindrical shape and embedding a winding coil C on the inner circumferential surface thereof to shrink or weld the inner circumferential surface of the casing 110. It is composed of a movable member 132 to form a magnetic path with the stator 131 by placing a predetermined gap in the interior of the.

The mover 132 is formed in a cylindrical shape similar to the stator 131, and is coupled to the first cylinder 141 and the second piston 152 by a magnet frame 132A and a winding coil of the stator 131. The magnets 132B are attached to or fixedly fixed to the outer circumferential surface of the magnet frame 132A so as to face C). The length of the magnet 132B is preferably formed by adding the width of the winding coil C and the length of one pole portion of the stator 131.

On one inner circumferential surface of the magnet frame 132B, as illustrated in FIG. 4, it is preferable to form a locking protrusion 132a to hang the front end of the first cylinder 141.

Further, both ends of the magnet frame 132B form a part of the resonant spring unit 160, and the front support protrusions 161A and the rear side which support the front resonant spring 162 and the rear resonant spring 163 which will be described later. Coupling the support protrusion (161B).

The first compression unit 140 includes the first cylinder 141 which is press-fitted or inserted into the inner circumferential surface of the magnet frame 132a and the first compression unit 140 slides into the first compression space S1 of the first cylinder 141. The first piston 142 coupled to the gas suction pipe SP and fixed to the front end surface of the first piston 142 to open and close the first gas passage F1 of the first piston 142. Compression back of the suction valve 143, the first discharge valve 144A arranged to be detachably attached to the front end surface of the first cylinder 141 to open and close the first compression space F1, and the first discharge valve 144A. And a first valve spring 144B that elastically supports the first discharge valve 144A interposed between an inlet end surface of the second piston 152 corresponding thereto. A first discharge space S2 is formed between the front end of the first cylinder 144A and the rear end of the second piston 152 to accommodate the first discharge valve 144A and the first valve spring 144B. .

The second compression unit 150 includes a second cylinder 151 which is press-fitted or inserted into the cylinder hole 121a of the front frame 121 and a second compression space S3 of the second cylinder 151. ) To open and close the second piston 152 and the first gas flow path F1 of the first piston 142 to be slidably inserted into the mover 132 of the reciprocating motor 130. The second suction valve 153 mounted on the front end surface of the second piston 152 and the second discharge valve opening and closing the second compression space S1 are arranged to be detachably attached to the front end surface of the second cylinder 151 ( A second valve spring for elastically supporting the second discharge valve 154A interposed between 154A and the compression rear surface of the second discharge valve 154A and the corresponding inlet end surface of the second piston 152 corresponding thereto. 154B.

The resonant spring unit 160 is formed of a compression coil spring, and includes a plurality of front side resonance springs 162 and rear support protrusions interposed between the front support protrusion 161A and the corresponding front frame 121. 161B and a plurality of rear resonant springs 163 interposed between the corresponding inner wall surfaces of the casing 110.

On the other hand, the magnet frame 132a, the first cylinder 141, the first piston 143, the second cylinder 151 and the second piston 152 of the mover 132 is the gas suction pipe (SP) and It is preferable to form so that it may be arranged concentrically with the gas discharge pipe DP.

In the drawings, the same reference numerals are given to the same parts as in the prior art.

The reciprocating compressor of the present invention as described above operates as follows.

That is, when power is applied to the stator (exactly, the winding coil) 131 of the reciprocating motor 130, a flux is formed between the stator 131 and the magnet 132b of the mover 132 to move the actuator. 132 and the first cylinder 141 and the first piston 142 reciprocates in the flux direction by the resonant spring unit 160, during which the refrigerant gas is sucked into the first compression space (S1) After the compression is discharged and the suction is again sucked into the second compression space (S3) and a series of processes to be discharged through the gas discharge pipe (DP) is repeated.

Looking at this in more detail as follows.

First, as shown in FIG. 5, when the mover 132 moves to the left side of the drawing, the first piston 142 moves away from the first discharge valve 141, and the pressure in the first compression space S1 is increased. Relatively lower than the pressure of the flow path (F1), the first intake valve 143 is opened due to the refrigerant gas through the gas suction pipe (SP) and the first gas passage (F1) to the first compression space (S1). Is inhaled. At the same time, the second piston 152 is also moved to the left side of the drawing while the second piston 152 is closer to the second discharge valve 154A, whereby the pressure in the second compression space S3 causes the second discharge space ( Relatively higher than the pressure of S4 and the two-stage compressed refrigerant gas in the second compression space (S3) is discharged to the second discharge space (S4) over the second discharge valve 154A, the discharge gas is the front frame It discharges to the refrigeration cycle apparatus through the gaseous outlet 121b of 121 and the gaseous discharge pipe DP.

At this time, the second discharge valve 154A is supported by the second valve spring 154B. After the refrigerant gas in the second compression space S4 is discharged, the second discharge valve 154A returns immediately to seal the second compression space S3. In addition, as the movable member 132 moves to the left side, the front resonance spring 162 is compressed and the rear resonance spring 163 is extended.

Next, as shown in FIG. 6, when the mover 132 moves to the right side of the drawing, the first piston 142 approaches the first discharge valve 144A and the pressure in the first compression space S1 discharges. Compared to the pressure of the space S2, the first suction valve 143 is closed while the first discharge valve 144A is opened, and the refrigerant gas in the first compression space S1 is discharged from the first discharge valve (S2). The liquid is discharged through the 144A to the first discharge space S2. At the same time, the second piston 152 is also moved to the right side of the drawing while the second piston 152 moves away from the second discharge valve 154A, so that the pressure in the second compression space S3 and the first discharge space S2 It is relatively lower than the pressure of the second gas flow path (F2), and thus the first stage compressed refrigerant gas is sucked into the second compression space (S3) while overcoming the second intake valve 153, as described above As soon as the mover 132 moves to the left side of the drawing, a series of processes are repeated in which the second stage is compressed in the second compression space S3 and then discharged into the second discharge space S4.

At this time, the first discharge valve 144A is supported by the first valve spring 144B and immediately after the refrigerant gas in the first compression space S1 is discharged, the first discharge valve 144A is closed to seal the first compression space S1. In addition, as the mover 132 moves to the right, the front resonance spring 162 is extended and the rear resonance spring 163 is compressed.

In this way, the refrigerant gas can be compressed into two stages in one casing, so the high compression ratio operation can be performed with one compressor, thereby reducing the number of parts and the assembly labor compared to having a plurality of compressors for the high compression ratio operation. The cost can be reduced and the installation space of the compressor can be reduced when the refrigerator is installed in the refrigerator, thereby increasing the effective area in the refrigerator or miniaturizing the refrigerator itself.

In the two-stage reciprocating compressor according to the present invention, by installing one reciprocating motor in the casing and combining the first compression unit and the second compression unit to each of the reciprocating motors, the two compressors are operated by one reciprocating motor. It can be driven at the same time, and the compression stroke and suction stroke of the two compressors are alternately arranged so that the high compression ratio operation can be performed with one compressor, thereby reducing the number of parts or assembly of the compressor for this purpose.

In addition, it is not necessary to provide a plurality of compressors for the high compression ratio operation, so that the space occupied by the entire compressor can be reduced when the refrigerator or the like is installed, thereby increasing the effective area of the refrigerator or miniaturizing the refrigerator itself.

Claims (8)

A casing having a gas suction pipe and a gas discharge pipe; A frame unit fixed inside the casing; A reciprocating motor for reciprocating motion comprising a stator fixed to the frame unit and a mover inserted to reciprocate linearly inside the stator; The first gas passage is coupled to the mover of the reciprocating motor to reciprocate linearly together with the first cylinder and slides into the first compression space of the first cylinder to be fixed to the casing and communicate with the gas suction pipe. A first piston to be formed, a first suction valve mounted on the front end face of the first piston to open and close the first gas flow path, and a first discharge valve disposed on the front end face of the first cylinder to open and close the first compression space. A first compression unit comprising; A second cylinder integrally or post-assembled to the frame unit to communicate with the gas discharge pipe, a second piston mechanically coupled to the mover of the reciprocating motor to reciprocate linearly in the compression space of the second cylinder; A second intake valve mounted on the front end surface of the second piston to open and close the second gas flow path formed on the second piston, and a second discharge valve disposed on the front end surface of the second cylinder to open and close the second compression space. A second compression unit comprising; And a resonant spring unit including a front resonant spring and a rear resonant spring so as to support the frame unit to induce resonant motion of the mover, the first cylinder, and the second piston. The method of claim 1, The frame unit is a two-stage reciprocating compressor characterized in that the outer surface is fixed to the inner surface of the casing. The method of claim 1, The reciprocating motor includes a stator for forming a plurality of stator cores in a thin plate, stacked in a cylindrical shape, embedding a winding coil on the inner circumferential surface thereof, and pressing-fixing the inner circumferential surface of the casing; A two-stage reciprocating compressor comprising a magnet frame arranged with a predetermined gap on an inner circumferential surface of a stator and a plurality of magnets fixed to the magnet frame to form a magnetic path together with the stator. The method of claim 3, A two-stage reciprocating compressor comprising a first cylinder inserted into an inner circumferential surface of a magnet frame to fix the first piston, and mechanically connecting a second piston from one end of the magnet frame to the outside. The method of claim 4, wherein The first discharge valve is detachably arranged in the first cylinder, the two-stage reciprocating compressor characterized in that the first discharge valve is supported by a first valve spring fixed to the second piston. The method of claim 1, Two-stage reciprocating compressor characterized in that the first piston is fixed to the gas suction pipe. The method of claim 1, A front-side resonant spring and a rear-side resonant spring are two-stage reciprocating compressors, each of which is coupled to both ends of the mover with the stator of the reciprocating motor therebetween. The method according to any one of claims 1 to 7, Stator and mover of the reciprocating motor and each center of the first cylinder and the first piston of the first compression unit and the second cylinder and the second piston of the second compression unit are in line with the center of the gas suction pipe and the gas discharge pipe of the casing. Two-stage reciprocating compressor, characterized in that located on the.