KR20070034229A - Capacity variable rotary compressor - Google Patents

Abstract

A variable displacement rotary compressor is disclosed in which a clutch pin can be firmly fixed to a rotary shaft. This variable displacement rotary compressor has a first and a second compression chamber having different contents, a first and second eccentric cams eccentrically installed on the rotary shaft, first and second eccentric bushes disposed on the outer circumferential surface of each eccentric cam, A slot is provided between the first and second eccentric bushes, a clutch pin coupled to a pinhole formed on a rotating shaft, and a shock absorbing member installed on the clutch pin. The shock absorbing member is first contacted before the clutch pin collides with both ends of the slot to absorb shock and noise.

Description

Capacity Variable Rotary Compressor

1 is a longitudinal sectional view showing an approximate internal structure of a variable displacement rotary compressor according to the present invention.

FIG. 2 is an exploded perspective view showing the rotating shaft and the eccentric device of FIG. 1 separately.

Figure 3 is a cross-sectional view showing that the eccentric device is assembled to the rotating shaft showing that the shock absorbing member coupled to the clutch pin is moving to one end of the slot in the slot of the eccentric device.

Figure 4 is a view corresponding to Figure 3 shows that the clutch pin is in contact with one end of the slot in a state in which the shock is relaxed by the shock absorbing member.

5 is a view showing that the rotation axis is rotated forward and the compression action is performed in the first compression chamber by the eccentric apparatus according to the present invention.

FIG. 6 is a view corresponding to FIG. 5, in which the rotating shaft rotates forward so that a compression action is not performed in the second compression chamber by the eccentric apparatus according to the present invention.

7 is a view showing that the rotating shaft is rotated in reverse to the compression operation in the second compression chamber by the eccentric apparatus according to the present invention.

FIG. 8 is a view corresponding to FIG. 7, in which the rotating shaft is reversely rotated so that the compression action is not performed in the first compression chamber by the eccentric apparatus according to the present invention.

9 and 10 are views corresponding to FIGS. 2 and 4, respectively, illustrating an impact absorbing member according to another embodiment of the present invention.

* Description of symbols on the main parts of the drawings *

10: axis of rotation 31: first compression chamber

32: second compression chamber 40: eccentric apparatus

41: 1st eccentric cam 42: 2nd eccentric cam

51: first eccentric bush 52: second eccentric bush

80: clutch pin 85: pinhole

90,90a: shock absorbing member

The present invention relates to a capacitively variable rotary compressor, and more particularly, to a variable-capacity rotation in which a clutch pin for transmitting the rotational force of the rotary shaft to the eccentric bushing can alleviate the impact caused by repeated collision with the eccentric bushing and reduce the noise. Relates to a compressor.

A cooling device that cools a specific space using a refrigeration cycle, such as an air conditioner and a refrigerator, includes a compressor to compress the refrigerant gas. The cooling capacity of such a cooling device is usually determined by the compression capacity of the compressor. When the compressor is configured to vary the compression capacity of the compressor, the cooling device can be controlled to operate in an optimal state according to the surrounding conditions, thereby saving energy. You can save.

The present applicant has filed a variable displacement rotary compressor disclosed in Korea Patent Publication No. 10-2005-0031797. The conventional variable displacement rotary compressor includes an eccentric device for varying the capacity by selectively compressing only one compression chamber among two compression chambers having different contents.

The eccentric device includes a rotating shaft passing through each compression chamber, two eccentric cams protruding from the outer surface of the rotating shaft, two eccentric bushes rotatably disposed on the outer surface of each eccentric cam, and rotating on the outer surface of each eccentric bush. Two rollers, which are arranged to compress the gas, and a clutch pin that allows one eccentric bushing to be shifted to an eccentric position with respect to the center line of the axis of rotation and another eccentric bushing to a concentric position depending on the direction of rotation of the rotary shaft. It is configured to include.

In the conventional capacity-variable rotary compressor configured as described above, when the rotating shaft rotates in the forward or reverse direction, the compression capacity is changed only in any one of two compression chambers having different contents by the eccentric device, thereby changing the compression capacity.

On the other hand, such a variable displacement rotary compressor has a clutch pin protruding from the rotary shaft to change the capacity in the slot formed between the two eccentric bushes in the forward or reverse direction to collide with both ends of the slot, During the compression operation by rotating in a certain direction, the eccentric bush rotates faster than the eccentric cam due to the pressure change inside the compression chamber. As a result, slip occurs between the eccentric cam and the eccentric bush. When the clutch pin is over again, the collision with the eccentric bush is repeated.

The clutch pin is damaged and the loud noise is generated by the impact caused by the repeated collision of the clutch pin. In the conventional variable displacement rotary compressor, the clutch pin is fixed at both ends of the slot to alleviate such repeated impact. A restraining member that restrains with elastic force is installed.

This restraint member reduces the shock between both ends of the clutch pin and the slot and at the same time, as the clutch pin is bound to the restraint member with a certain elastic force, slip motion of the eccentric bush is prevented, thereby preventing damage to the clutch pin and reducing noise. You can do it.

However, such a capacity-variable rotary compressor may reduce the elastic force of the restraint member as the clutch pin is repeatedly inserted into or restrained from the restraint member, thereby reducing the shock-absorbing effect of the restraint member.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a variable displacement rotary compressor that can effectively alleviate the impact caused when the clutch pin repeatedly hits both ends of the slot. .

Capacity variable rotary compressor according to the present invention for achieving this object,

First and second compression chambers having different contents, rotating shafts penetrating through the first and second compression chambers, and eccentrically installed in the rotating shafts, respectively, disposed in the first and second compression chambers, respectively. 2 eccentric cam, a first and second eccentric bush disposed on the outer circumferential surface of the first and second eccentric cam, respectively, a slot provided with a predetermined length between the first and second eccentric bush, coupled to the rotating shaft in the slot Clutch pin is disposed, characterized in that it is provided with a shock absorbing member which is directly coupled to the clutch pin to absorb the shock generated when the clutch pin is in contact with both ends of the slot.

The rotating shaft has a pin hole formed in a radial direction, the clutch pin is composed of a body portion fitted into the pin hole and a head portion protruding from the rotating shaft and disposed in the slot, the shock absorbing member is attached to the outer peripheral surface of the head portion do.

In one embodiment of the invention, the shock absorbing member is made of rubber.

Preferably the shock absorbing member is formed in an annular shape to be coupled to the clutch pin.

In another embodiment of the present invention, the shock absorbing member may be formed by winding the leaf spring in the form of a roll.

The size of the head of the clutch pin to which the shock absorbing member is coupled is smaller than the width of the slot to allow the clutch pin to move smoothly in the slot.

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

Figure 1 shows the approximate internal structure of the variable displacement rotary compressor according to the present invention. As shown in FIG. 1, the variable displacement rotary compressor according to the present invention is installed inside the sealed container 10 to generate a rotational force, and receives the rotational force of the driving unit 20 to compress the gas. The compression unit 30 is provided.

The drive unit 20 includes a cylindrical stator 22 installed inside the sealed container 10, a rotor 23 rotatably installed inside the stator 22, and a central portion of the rotor 23. It includes an axis of rotation 21 which extends and rotates forward (or counterclockwise) or counterclockwise (or clockwise) with the rotor 23.

The compression unit 30 is disposed on the upper and lower ends of the cylindrical housing 33, which is provided with a first compression chamber 31 and a second compression chamber 32 having different contents in the upper and lower portions, respectively. And a first flange 35 and a second flange 36 which rotatably support the rotating shaft 21, and are arranged between the first compression chamber 31 and the second compression chamber 32, so that the first and second Intermediate plates 34 to allow the compression chambers 31 and 32 to be partitioned from each other.

The height of the first compression chamber 31 is larger than the height of the second compression chamber 32 so that the first compression chamber 31 has a larger internal volume than the second compression chamber 32, so that the rotary compressor of the present invention It will have a variable capacity. Of course, the variable displacement rotary compressor of the present invention may have a structure in which the second compression chamber 32 is made larger than the first compression chamber 31.

The inside of the first and second compression chambers 31 and 32 may be selectively compressed only in any one of the first and second compression chambers 31 and 32 according to the rotational direction of the rotation shaft 21. An eccentric device 40 is disposed, and the structure and operation of the eccentric device 40 will be described later with reference to FIGS. 2 to 10.

The first and second compression chambers 31 and 32 are respectively provided with a first roller 37 and a second roller 38 rotatably disposed on the outer circumferential surface of the eccentric device 40, and in the housing 33. First and second suction ports 63 and 64 and first and second discharge ports 65 and 66 arranged to communicate with the first and second compression chambers 31 and 32, respectively (FIGS. 5 and 7). Is formed).

The first vane 61 is radially disposed between the first suction port 63 and the first discharge port 65 in a state of being in close contact with the first roller 37 by the support spring 61a (see FIG. 5). The second vane 62 is radially disposed between the second suction port 64 and the second discharge port 66 in a state of being in close contact with the second roller 38 by the support spring 62a (Fig. 7).

The outlet pipe 69a of the accumulator 69 which separates the liquid refrigerant and allows only the gas refrigerant to flow into the compressor, is provided only on the inlet side of the first and second inlet ports 63 and 64 formed in the housing 33 in which the compression operation is performed. A flow path switching device 70 for selectively opening and closing each suction flow path 67 and 68 so that a gas refrigerant is supplied is provided. Inside the flow path switching device 70, a valve device 71 operated by the pressure difference between the suction flow path 67 connected to the first suction port 63 and the suction flow path 68 connected to the second suction port 64 is left and right. It is arranged to be movable.

Next, the structure of the eccentric device 40 constituting the characteristic configuration of the present invention will be described with reference to FIGS. Figure 2 is an exploded perspective view showing the eccentric device and the rotating shaft of Figure 1 separated, Figure 3 and Figure 4 is a cross-sectional view showing that the eccentric device is assembled to the rotating shaft Figure 3 is a shock absorbing member coupled to the clutch pin of the eccentric device 4 shows that the clutch pin is in contact with one end of the slot while the shock is relaxed by the shock absorbing member.

As shown in FIG. 2, the eccentric device 40 includes a first eccentric cam 41 and a second eccentric provided at positions corresponding to the first and second compression chambers 31 and 32, respectively, on the rotation shaft 21. The first and second eccentric bushes 51 and 52, which are disposed on the outer circumferential surfaces of the cams 42 and the first and second eccentric cams 41 and 42, respectively. The clutch pin 80 is provided between the clutch pins 80 and the first and second eccentric bushes 51 and 52 at a predetermined length so that the rotating shaft 21 rotates in the forward or reverse direction. It is provided with a slot 53 which can be latched to enable a clutching operation (or a turning operation).

The first and second eccentric cams 41 and 42 are integrally formed to protrude transversely from the outer circumferential surface of the rotation shaft 21 and surround the outer surfaces of the first and second eccentric cams 41 and 42, respectively. The first and second eccentric bushes 51 and 52 are formed to be eccentric in directions facing each other.

The first and second eccentric bushes 51 and 52 are integrally formed by a connecting portion 54 connecting them, and the slot 53 to which the clutch pin 80 is inserted and rotated is connected to the connecting portion 54. In the circumferential direction. Accordingly, the first and second eccentric bushes 51 and 52 may be caught by the first end 53a or the second end 53b of the slot 53 while the clutch pin 80 rotates along the slot 53. When rotated together by the clutch pin 80 is switched to the concentric position or the maximum eccentric position with respect to the rotary shaft (21).

The clutch pin 80 is interposed between the first and second eccentric cams 41 and 42 so as to protrude from the rotation shaft 21 by being fitted in a pinhole 85 formed radially toward the center of the rotation shaft 21. . That is, the clutch pin 80 is inserted into the slot 53 to perform the clutching operation, and the body portion extending from the head 81 to be fitted into the pin hole 85 of the rotating shaft 21. Comprising (82), the threaded portion is formed in the body portion 82 and the pinhole 85 so that the clutch pin 80 is firmly screwed to the pinhole (85). Of course, the clutch pin 80 may be coupled to the pinhole 85 by another coupling method such as press-fitting or welding instead of screwing.

Meanwhile, as the clutch pin 80 performs the clutching operation in the slot 53, the head 81 of the clutch pin 80 is connected to the first end 53a and the second end 53b of the slot 53. Impact and noise is generated as the collision, for this purpose, the shock absorbing member 90 is installed on the clutch pin (80).

The shock absorbing member 90 is made of a material capable of absorbing shock and is firmly coupled to the head 81 of the clutch pin 80. In this embodiment, the shock absorbing member 90 is made of a rubber material having excellent shock absorption and durability. It was supposed to be coupled to the outer circumferential surface of the head 81 of the clutch pin 80.

That is, the shock absorbing member 90 of the present invention has a predetermined thickness and a rubber material in the annular shape of the inner diameter is the same as the diameter of the head 81 of the clutch pin 80, the head 81 of the clutch pin 80 ) Is fitted in the form of a cap to be bonded or firmly bonded using an adhesive or other bonding method.

As shown in FIG. 3, the size or diameter of the head 81 of the clutch pin 80 to which the shock absorbing member 90 is coupled is smaller than the width of the slot 53 so that the clutch pin 80 may be formed in the slot ( 53) It allows for smooth movement within.

Accordingly, as shown in FIG. 3, the first and second eccentric cams 41 and 42 are disposed in the first and second eccentric bushes 51 and 52, respectively, and the pin holes 85 of the rotation shaft 21 are slotted. When the clutch pin 80 is fastened to the pinhole 85 after being positioned at the 53, the head 81 of the clutch pin 80 to which the shock absorbing member 90 is coupled is stationary along the slot 53. It is positioned in the slot 53 to allow rotation.

In this state, when the rotating shaft 21 rotates in the forward direction (counterclockwise in FIG. 3), as shown in FIG. 4, the head portion 81 of the clutch pin 80 has the first end 53a of the slot 53. Shock and noise between the clutch pin 80 and the first end (53a) of the slot 53, while the shock absorbing member (90) first contacts the first end (53a) of the slot (53) before impacting Will absorb.

Similarly, although not shown, when the rotating shaft 21 rotates in the reverse direction, the shock absorbing member 90 comes into contact with the second end 53b of the slot 53 in advance of the head 81 of the clutch pin 80. Similarly, shock and noise between the clutch pin 80 and the first end 53b of the slot 53 are absorbed.

Next, an operation of selectively compressing refrigerant gas in the first and second compression chambers by the eccentric device configured as described above will be described with reference to FIGS. 5 to 8.

As shown in FIGS. 5 and 6, when the rotation shaft 21 rotates forward (counterclockwise in the drawing), the clutch pin 80 protruding from the rotation shaft 21 rotates along the slot 53 while being slotted. The first and second eccentric bushes 51 and 52 are rotated together with the rotation shaft 21 by being caught by the first end 53a of the 53.

When the clutch pin 80 is rotated in the state of being caught by the first end 53a of the slot 53 as shown in FIG. 5, the first eccentric bush 51 is about the center of the rotation shaft 21. The first roller 37 is rotated in contact with the inner circumferential surface of the housing 33 in the first compression chamber 31 so that the compression operation is performed in the first compression chamber 31. do.

On the other hand, as shown in FIG. 6, the second eccentric bush 52, which is eccentrically opposite to the first eccentric bush 51, is switched to a position which is concentric with respect to the center of the rotation shaft 21, so that the second roller 38 is spaced apart from the inner circumferential surface of the housing 33 by a predetermined interval in the second compression chamber 32 so that the compression operation is not made.

Therefore, when the rotating shaft 21 is rotated forward, the refrigerant gas introduced into the first suction port 63 by the first roller 37 is compressed in the first compression chamber 31 having a relatively high content, and thus the first discharge port 65. It is discharged through, and the compression operation is not performed in the second compression chamber 32 having a relatively small content so that the rotary compressor operates in a state where the compression capacity is large.

In contrast to the above, as shown in FIGS. 7 and 8, when the rotating shaft 21 is reversely rotated (clockwise in the drawing), the clutch pin 80 protruding from the rotating shaft 21 rotates along the slot 53. While being caught by the second end 53b of the slot 53, the first and second eccentric bushes 51 and 52 rotate together with the rotation shaft 21.

When the clutch pin 80 is rotated in the state caught by the second end 53b of the slot 53 as shown in FIG. 7, the second eccentric bush 52 is about the center of the rotation shaft 21. The second roller 38 is rotated in the state of being in the maximum eccentric position and the second roller 38 is in contact with the inner circumferential surface of the housing 33 in the second compression chamber 32, so that the compression operation is performed in the second compression chamber 32. You lose.

On the other hand, as shown in FIG. 8, the first eccentric bush 51, which is eccentrically opposite to the second eccentric bush 52, is switched to a position which is concentric with the center of the rotation shaft 21 and thus the first roller. 37 is spaced apart from the inner circumferential surface of the housing 33 by a predetermined interval in the first compression chamber 31 so that the compression operation is not made.

Therefore, when the rotating shaft 21 is reversely rotated, the refrigerant gas introduced into the second suction port 64 by the second roller 38 is compressed in the second compression chamber 32 having a relatively low internal content, thereby compressing the second discharge port 66. In the first compression chamber 31 having a relatively high content, the compression operation is not performed, and thus the rotary compressor operates in a state where the compression capacity is small.

As described above, the clutch pin coupled to the pinhole 85 by the rotation operation of the rotating shaft 21, the first and second eccentric bushes 51 and 52, and the first and second rollers 37 and 38 ( While the 80 repeatedly collides with the first and second stages 53a and 53b of the slot 53, the variable displacement rotary compressor of the present invention has a shock absorbing member 90 installed on the clutch pin 80 first. By contacting the first and second ends 53a and 53b of the slot 53 to absorb shock and noise, it is possible to prevent damage to the clutch pin 80 and to reduce collision noise.

Meanwhile, the first or second compression chamber 31 in which the compression process is performed while the rotating shaft 21 rotates in the forward or reverse direction to selectively perform the compression operation in the first or second compression chambers 31 and 32. The first or second eccentric bushes 51 and 52 rotate faster than the first or second eccentric cams 41 and 42 due to the pressure change inside the 32. A slip phenomenon occurs between the eccentric cams 41 and 42 and the first and second eccentric bushes 51 and 52, and when the slip is finished, the clutch pin 80 is again the first of the slots 53. Alternatively, the second stages 53a and 53b may collide with each other, but at this time, the shock absorbing member 90 may act to absorb shock and noise.

9 and 10 show a shock absorbing member 90a according to another embodiment of the present invention as a diagram corresponding to FIGS. 2 and 4, respectively.

As shown in Fig. 9, the shock absorbing member 90a according to the second embodiment is a clutch pin wound around the leaf spring in the form of a roll instead of the shock absorbing member 90 according to the first embodiment made of a rubber material. It has a structure that is firmly coupled to the outer circumferential surface of the head 81 of 80 by welding or other coupling method to have a certain elastic force and to form a shock absorbing space therein, the impact according to the first embodiment It acts the same as the absorbing member (90).

That is, as shown in Figure 10, when the shock absorbing member (90a) according to the second embodiment is in close contact with the first end (53a) of the slot 53, the shock absorbing member (90a) of the slot 53 As the part contacting the first end 53a is compressed, shock and noise are absorbed to prevent direct collision of the clutch pin 80, thereby preventing damage to the clutch pin 80.

As described in detail above, the capacity variable rotary compressor according to the present invention has a structure in which the shock absorbing member is first contacted before the clutch pin collides with both ends of the slot, thereby greatly reducing shock and noise. By preventing damages, the life of the clutch pin can be greatly extended, and at the same time, there is an effect of quiet operation.

Claims (6)

First and second compression chambers having different contents, rotating shafts penetrating through the first and second compression chambers, and eccentrically installed in the rotating shafts, respectively, disposed in the first and second compression chambers, respectively. 2 eccentric cam, a first and second eccentric bush disposed on the outer circumferential surface of the first and second eccentric cam, respectively, a slot provided with a predetermined length between the first and second eccentric bush, coupled to the rotating shaft in the slot And a shock absorbing member disposed directly on the clutch pin, the shock absorbing member absorbing the shock generated when the clutch pin contacts both ends of the slot. According to claim 1, The rotating shaft has a pin hole formed in the radial direction, The clutch pin is composed of a body portion that is fitted to the pin hole and the head portion protruding from the rotating shaft is disposed in the slot, The shock absorbing member is A capacity variable rotary compressor, characterized in that attached to the outer peripheral surface of the head. The variable displacement rotary compressor according to claim 1, wherein the shock absorbing member is made of rubber. 4. The variable displacement rotary compressor according to claim 3, wherein the shock absorbing member is formed in an annular shape and coupled to the clutch pin. 3. The variable displacement rotary compressor according to claim 2, wherein the shock absorbing member is formed by winding a leaf spring in a roll form. 3. The variable displacement rotary compressor according to claim 2, wherein the size of the head of the clutch pin to which the shock absorbing member is coupled is smaller than the width of the slot to allow the clutch pin to move smoothly in the slot.

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