KR100667276B1 - Variable capacity rotary compressor - Google Patents

Abstract

Disclosed is a variable displacement rotary compressor that is easy to assemble while the clutch pin is firmly coupled to the rotary shaft. The variable displacement rotary compressor according to the present invention includes an upper and lower compression chamber divided into different contents, a rotation shaft penetrating the two compression chambers, and an upper and lower eccentric bushes installed eccentrically on the rotation shaft and accommodated in each compression chamber. And a slot provided between the upper and lower eccentric bushes, a pinhole provided on the rotating shaft at a position opposite to the slot, and coupled to the pinhole to protrude so as to be caught by either side engaging portions of the slot according to the forward and reverse rotational directions of the rotating shaft. In a variable displacement rotary compressor having a clutch pin, an elastic member is further provided inside the rotating shaft so that the clutch pin is elastically inserted into the slot, and the clutch pin is coupled to the pinhole so as to be retractable. Since it is formed to elastically bias toward the slot side, even if the clutch pin is repeatedly subjected to an impact due to the forward / reverse rotation of the rotating shaft, it is easy from the pinhole. It does not go away.

Description

Variable Capacity Rotary Compressor {VARIABLE CAPACITY ROTARY COMPRESSOR}

1 is a longitudinal cross-sectional view showing the configuration of a variable displacement rotary compressor according to the present invention.

Figure 2 is an exploded perspective view showing the configuration of the eccentric device of the variable displacement rotary compressor according to the present invention.

3 is an enlarged cross-sectional view illustrating a coupling relationship between the clutch pin and the pinhole illustrated in FIG. 2.

4 is a cross-sectional view showing that the compression operation is performed in the upper compression chamber when the rotating shaft of the variable displacement rotary compressor according to the present invention rotates in the forward direction.

5 is a cross-sectional view showing that the compression operation is not performed in the lower compression chamber when the rotating shaft of the variable displacement rotary compressor according to the present invention rotates in the forward direction.

6 is a cross-sectional view showing that the compression operation is not performed in the upper compression chamber when the rotating shaft of the variable displacement rotary compressor according to the present invention rotates in the reverse direction.

7 is a cross-sectional view showing that the compression operation is performed in the lower compression chamber when the rotating shaft of the variable displacement rotary compressor according to the present invention rotates in the reverse direction.

* Description of the symbols for the main functions of the drawings *

10. Airtight container 20. Driving part

21. Rotating shaft 22. Stator

23. Rotor 30. Compressor

31. Upper compression chamber 32. Lower compression chamber

37. Upper roller 38. Lower roller

40. Upper eccentric 50. Lower eccentric

81..Clutch pin 82..Elastic member

84.Slots

The present invention relates to a variable displacement rotary compressor, and more particularly, to a variable displacement rotary compressor capable of preventing the clutch pin for transmitting the power of the rotary shaft to the eccentric bush from being separated from the rotary shaft by repeated impact.

A compressor for compressing a refrigerant is installed in a cooling device that cools a specific space, such as an air conditioner or a refrigerator. The cooling capacity of the cooling device is usually determined according to the compression capacity of the compressor. When the compressor is configured to vary the compression capacity of the compressor, it is possible to save energy by operating the cooling device in an optimal state according to the surrounding conditions. Will be.

Compressors used in the cooling system include a rotary compressor and a reciprocating compressor. For example, Korean Patent Application No. 10-2002-0061462 discloses that a compression operation is selectively performed only in one of two compression chambers having different contents. A variable displacement rotary compressor is disclosed in which a displacement is varied by varying the capacity.

In other words, in each compression chamber of the variable displacement rotary compressor, an eccentric device is provided so that the compression operation is performed in only one compression chamber according to the rotation direction of the rotation shaft. For example, the eccentric device is provided on the outer surface of the rotation shaft passing through the compression chambers. Two eccentric cams, two eccentric bushes rotatably disposed on the outer surface of each eccentric cam, two rollers rotatably disposed on the outer surface of each eccentric bush, and compressing refrigerant gas, and a rotating shaft One eccentric bush according to the direction of rotation is configured to include a clutch pin provided to be switched to the eccentric position with respect to the center line of the rotation axis and the other to the concentric position.

The conventional variable displacement rotary compressor having the above structure has a structure in which the eccentric bush is rotated forward and backward with the rotary shaft by selectively engaging the clutch pin formed on the rotary shaft with each eccentric bush disposed on the outer circumferential surface of the eccentric cam. The clutch pin repeatedly hits the eccentric bushing every time the direction of rotation is switched.

Therefore, the conventional clutch pins that are screwed to the rotating shaft are subjected to repeated shocks so that the screwed indenting portion is deformed and pulled out of the rotating shaft, or, in the event of a collision, the screwed indenting portion is reversely rotated and released from the rotating shaft. It was.

The present invention is to solve the above problems, an object of the present invention is to provide a variable displacement rotary compressor that is easy to assemble the clutch pin is firmly coupled to the rotary shaft.

Capacity variable rotation compressor according to the present invention for achieving the above object is the upper and lower compression chamber partitioned into different contents, the rotary shaft penetrating the two compression chamber, and the eccentricity is installed in the rotary shaft accommodated in each compression chamber Between the upper and lower eccentric bushes, the slots provided between the upper and lower eccentric bushes, the pinholes provided on the rotary shaft at positions opposite to the slots, and the pinholes coupled to the pinholes, In the variable displacement rotary compressor having a clutch pin protruding to be caught in any one, the elastic member is further provided inside the rotating shaft so that the clutch pin is elastically fitted into the slot, the clutch pin is coupled to the pinhole to move back and forth , The elastic member is characterized by elastically biasing the clutch pin to the slot side.

In addition, the clutch pin has a body portion having a diameter larger than the width of the slot, a head portion having a diameter smaller than the width of the slot and protruding from the tip of the body portion, and a diameter smaller than the width of the body portion It is provided with a guide portion extending from the guide shaft that is provided with a guide groove that can be retracted the end of the guide portion in the interior of the rotating shaft facing the pinhole so that the head portion can be drawn into the interior of the rotating shaft, the elastic member It is characterized by being fitted.

In addition, a support groove for supporting one end of the elastic member is formed inside the rotation shaft, the support groove is characterized in that the step formed with the guide groove.

Hereinafter, a preferred embodiment of the variable displacement rotary compressor according to the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the variable displacement rotary compressor according to the present invention is installed in the sealed container 10 and has an upper drive unit 20 for generating a rotational force, the drive unit 20 and the rotating shaft 21. It is provided with a compression unit 30 of the lower side connected through.

The driving unit 20 is a cylindrical stator 22 fixed to the inner surface of the sealed container 10 and a rotor 23 rotatably installed inside the stator 22, the center of which is coupled to the rotating shaft 21. It consists of, and rotates the rotating shaft 21 forward or reverse. An oil hole 22 is formed in the rotational shaft 21 in the longitudinal direction to supply oil stored in the lower portion of the sealed container 10 to the driving unit 20 and the compression unit 30.

The compression unit 30 includes an upper housing 33a and a lower housing 33b each having cylindrical upper compression chambers 31 and lower compression chambers 32 each having different contents defined therein. In addition, the compression unit 30 closes the upper and lower sides of the upper compression chamber 31 and the lower compression chamber 32, and at the same time, the flanges 35 and 36 provided to rotatably support the rotating shaft 21, and the upper and The intermediate plate 34 is interposed between the lower housings 33a and 33b to partition the upper compression chamber 31 and the lower compression chamber 32.

In addition, as shown in FIGS. 1 and 2, the upper eccentric device 40 and the lower eccentric device 50 are provided in the rotary shaft 21 inside the upper compression chamber 31 and the lower compression chamber 32, respectively. Upper rollers 37 and lower rollers 38 are rotatably coupled to the outer surfaces of these eccentric devices 40 and 50, respectively. In addition, between the inlet (63, 64) and the discharge port (65, 66) of each compression chamber (31, 32) in contact with the outer surface of the rollers (37, 38) in a radial direction to make a compression operation The first vane 61 and the second vane 62 are installed, and the vanes 61 and 62 are elastically supported through the first and second vane springs 61a and 62a, respectively. The suction ports 63 and 64 and the discharge ports 65 and 66 of the two compression chambers 31 and 32 are arranged in opposite directions with respect to the vanes 61 and 62, which change when the rotational direction of the rotary shaft 21 changes. The compression operation is performed only on one of the compression chambers 31 and 32 by the eccentric devices 40 and 50 inside the two compression chambers 31 and 32 so that the capacity variable operation can be performed. The configuration of the eccentric apparatuses 40 and 50 that enable such an operation will be described later.

As shown in FIG. 1, the variable displacement rotary compressor according to the present invention compresses the refrigerant in the suction pipe 69 from the suction port 63 of the upper compression chamber 31 and the suction port 64 of the lower compression chamber 32. It is provided with a flow path variable device 70 for varying the suction flow path so that the suction of the refrigerant can be selectively made only toward the suction port in which the operation.

The flow path variable device 70 includes a cylindrical body portion 71 and a valve device installed in the body portion 71. A suction pipe 69 is connected to the inlet 72 at the center of the body part 71, and the suction port 63 of the upper compression chamber 31 is connected to the first outlet 73 and the second outlet 74 at both sides of the body part. And pipes 67 and 68 connected to suction ports 64 of lower compression chamber 32, respectively. The valve device inside the body portion 71 includes a cylindrical valve seat 75 installed at the center and a first removably installed in both sides of the body portion 71 for opening and closing the ends of the valve seat 75. The opening and closing member 76 and the second opening and closing member 77, and the connecting member 78 for connecting the opening and closing members 76 and 77 so that the opening and closing members 76 and 77 move together. The flow path variable device 70 is inside the body 71 by a pressure difference acting on the two outlets 73 and 74 when a compression operation is made in either one of the upper compression chamber 31 and the lower compression chamber 32. The first opening and closing member 76 and the second opening and closing member 77 is to be able to automatically switch the suction flow while moving to a lower pressure.

Meanwhile, the upper and lower eccentric apparatuses 40 and 50 installed in the upper compression chamber 31 and the lower compression chamber 32, respectively, are shown in FIGS. 2 to 7, respectively. The upper eccentric cam 41 and the lower eccentric cam 51 formed so as to be eccentric to the outer surface of the rotary shaft 21 of the upper eccentric bush 42 rotatably coupled to the outer surfaces of the two eccentric cams 41 and 51. ) And the lower eccentric bush 52.

The upper and lower eccentric bushes 42 and lower eccentric bushes 52 are integrally connected to each other through a cylindrical connecting portion 43, and the eccentric directions thereof are opposite to each other, and the upper and lower rollers 37 and 38 described above are respectively disposed on the outer surfaces thereof. Rotatably coupled.

On the outer surface of the rotary shaft 21 between the upper eccentric cam 41 and the lower eccentric cam 51, an eccentric portion 44, which is eccentric in the same form as the eccentric cams 41 and 51, is provided. In addition, the eccentric portion 44 has a clutch member which allows the two eccentric bushes 42 and 52 to rotate in an eccentric state with the rotation shaft 21 or in an eccentric state in accordance with a change in the rotational direction of the rotation shaft 21. Is installed.

As shown in FIGS. 2 and 3, the clutch member includes a clutch pin 81 coupled to a pin hole 45 formed at one outer surface of the eccentric portion 44, and an upper eccentric bush at a position opposite to the pin hole 45. A connecting portion 43 connecting the 42 and the lower eccentric bush 52 is provided with a slot 84 formed in the circumferential direction. Slots 84 formed in the connecting portion 43 is formed to be able to switch the rotational direction of the upper eccentric bush 42 and the lower eccentric bush 52 which are eccentric in opposite directions to each other 180 degrees.

The clutch pin 81 has a body portion 81b having a diameter larger than the width of the slot 84, and a head portion 81a having a diameter smaller than the width of the slot 84 and protruding from the tip of the body portion 81b. ) And a guide portion 81c having a diameter smaller than the width of the body portion 81b and extending from the rear end thereof. According to the present invention, since the clutch pin 81 is coupled to the pinhole 45 so as to be retractable, the diameter of the pinhole 45 is slightly larger than the diameter of the body portion 81b of the clutch pin 81.

In addition, the clutch pin 81 having the above structure selectively rotates the eccentric bushes 42 and 52 by inserting the head portion 81a into the slot 84 elastically. The member 82 is provided.

The elastic member 82 is a coil spring elastically deformed in the longitudinal direction, and both ends are elastically supported on the inner wall of the oil hole 22 of the rotary shaft 21 and the step surface of the body portion 81b of the clutch pin 81. Preferably, the elastic member 82 is provided inside the pinhole 45 so that the clutch pin 81 is elastically biased toward the slot 84, wherein the elastic member made of a coil spring is a guide portion 81c of the clutch pin 81. ) To prevent buckling during compression of the coil spring.

In addition, a guide groove 46 in which the end of the guide portion 81c is accommodated is provided in the rotation shaft 21 opposite to the pinhole 45. For example, in order to fit the clutch pin 81 protruding elastically from the rotating shaft 21 into the slot 84, the head portion 81a is drawn into the rotating shaft 21 while the elastic member 82 is compressed. Should be. However, since the clutch pin 81 of the present invention is provided with a guide portion 81c at the rear end of the body portion 81b, the rear end portion of the guide portion 81c may be pushed backward by the length of the head 81a. Guide groove 46 is required. Of course, when the clutch pin 81 consists only of the head portion 81a and the body portion 81b, the guide groove 46 is unnecessary when the pinhole 45 is advanced and retracted by the elastic member 82.

In addition, the end of the oil hole 22 side of the guide groove 46 is extended in diameter to form an elastic member support groove 47 with a step formed with the guide groove 46. One side of the elastic member 82 is inserted into and fixed to the support groove 47 so that the position of the elastic member 82 is maintained firmly, thereby preventing buckling that may occur during elastic deformation.

In summary, the configuration of the clutch member made as described above is a state in which the rotary shaft 21 is engaged with the clutch pin 81 coupled to the eccentric portion 44 of the rotary shaft 21 inserted into the slot 84 of the connecting portion 43. When rotating, the clutch pin 81 rotates a predetermined section and is caught by either one of the two engaging portions 84a and 84b of the slot 84, so that the upper and lower eccentric bushes 42 and 52 are rotated with the rotary shaft 21. It can be rotated together. In this configuration, one of the upper and lower eccentric bushes 42 and 52 is eccentric when the clutch pin 81 is caught by either one of the two engaging portions 84a and 84b of the slot 84, and the other By making the eccentric release state, the compression operation is made in either one of the two compression chambers (31, 32) and the idling on the other side can be made. On the other hand, when the rotation direction of the rotating shaft 21 changes, the eccentric state of the upper and lower eccentric bushes 42 and 52 is reversed from the case described above.

Hereinafter, the operation of the variable displacement rotary compressor will be described.

When the rotating shaft 21 rotates in one direction (forward direction), as shown in FIG. 4, the clutch pin (with the outer surface of the upper eccentric bush 42 of the upper compression chamber 31 eccentric with the rotating shaft 21). 81 is in a state of being caught by one side locking portion 84a of the slot 84, the upper roller 37 is in contact with the inner surface of the upper compression chamber 31 to rotate while the compression operation of the upper compression chamber 31 is made. At this time, in the case of the lower compression chamber 32, as shown in Figure 5, the outer surface of the lower eccentric bush 52 eccentric in the opposite direction to the upper eccentric bush 42 is in a state concentric with the rotating shaft 21 Since the lower roller 38 is spaced apart from the inner surface of the lower compression chamber 32, idling is performed. In addition, when the compression operation is performed in the upper compression chamber 31, the suction of the refrigerant is made toward the suction port 63 of the upper compression chamber 31, so that the refrigerant is directed only to the upper compression chamber 31 by the operation of the flow channel variable device 70. A suction passage is formed so that the suction can be carried out.

This operation is possible because the upper eccentric cam 41 and the lower eccentric cam 51 are eccentric in the same direction, and the upper eccentric bush 42 and the lower eccentric bush 52 are eccentrically opposite to each other. That is, when the directions of the maximum eccentric portion of the upper eccentric cam 41 and the maximum eccentric portion of the upper eccentric bush 42 coincide, the directions of the maximum eccentric portion of the lower eccentric cam 51 and the maximum eccentric portion of the lower eccentric bush 52 are This is because they are reversed. When such a compression operation is made, the clutch pin 81 protruding in the outward direction of the rotation shaft 21 is caught by the locking portion 84a of the slot 84.

On the other hand, when the rotating shaft 21 is rotated in the reverse (reverse direction) as described above, the clutch pin 81 is moved along the slot 84 to the opposite side. While the position of the clutch pin 81 is changed, the eccentric bushes 42 and 52 do not rotate, and only the predetermined section rotation shaft 21 rotates.

When the rotating shaft 21 performs the compression operation while rotating in the opposite manner as described above, as shown in FIG. 6, the outer surface of the upper eccentric bush 42 of the upper compression chamber 31 is eccentric with the rotating shaft 21. In the state that the clutch pin 81 is caught in the other engaging portion 84b of the slot 84, the upper roller 37 is rotated in a state spaced apart from the inner surface of the upper compression chamber 31, the upper compression chamber 31 ) Idling is achieved. At this time, the lower compression chamber 32, as shown in Figure 7, the outer surface of the lower eccentric bush 52 is eccentric with the rotating shaft 21, the lower roller 38 is the inner surface of the lower compression chamber 32 The lower compression chamber 32 is compressed because it comes in contact with the rotating state.

In addition, when the compression operation is performed in the lower compression chamber 32, the suction of the refrigerant is made toward the suction port 64 of the lower compression chamber 32, and the refrigerant is directed toward the lower compression chamber 32 only by the operation of the flow channel variable device 70. A suction passage is formed so that the suction can be carried out.

As described in detail above, the variable displacement rotary compressor according to the present invention has a structure in which the clutch pin is firmly coupled to the pinhole of the rotary shaft, that is, the clutch pin is elastically biased outward by an elastic member provided inside the rotary shaft to the slot. Since it is fitted, the clutch pin is stable even if the clutch pin is repeatedly subjected to an impact due to the forward and reverse rotation of the rotating shaft. Furthermore, the assembly is easy because the clutch pin needs only to be positioned in the slot position while the elastic member is compressed.

Claims (5)

Upper and lower compression chambers divided into different contents, a rotary shaft penetrating the two compression chambers, upper and lower eccentric bushes eccentrically provided in the rotary shafts and accommodated in the respective compression chambers, and the upper and lower eccentrics. A clutch provided between the slot, a pinhole formed on the rotating shaft at a position opposite to the slot, and a clutch coupled to the pinhole and protruding so as to be caught by either side engaging portions of the slot according to the forward and reverse rotational directions of the rotating shaft. In a variable displacement rotary compressor having a pin, It is further provided with an elastic member provided inside the rotating shaft so that the clutch pin is elastically fitted to the slot, The clutch pin is coupled to the pin hole so as to be retractable, the elastic member is a variable displacement rotary compressor, characterized in that for biasing the clutch pin to the slot side. delete The method of claim 1, The clutch pin has a body portion having a diameter larger than the width of the slot, a head portion having a diameter smaller than the width of the slot and protruding from the tip of the body portion, and a diameter smaller than the width of the body portion and from the rear end thereof. It has an extended guide portion, The elastic member is a variable displacement rotary compressor characterized in that it is fitted to the guide portion. The method of claim 3, wherein And a guide groove capable of retracting the end of the guide portion in the rotation shaft opposite to the pinhole so that the head portion can be drawn into the rotation shaft. The method of claim 4, wherein A support groove for supporting one end of the elastic member is formed in the rotary shaft, the support groove is a variable displacement rotary compressor, characterized in that the step formed with the guide groove.

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