KR100664522B1 - Variable capacity 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 rotation shaft penetrating the two compression chambers and having an oil hole therein, first and second eccentric bushes disposed on the outer circumferential surface of the rotation shaft, and two eccentric bushes. A capacity variable rotary compressor comprising a slot provided between the clutch pin and a clutch pin protruding from the rotary shaft so as to be caught by any one of both sides of the slot according to the forward / reverse rotational direction of the rotary shaft. It includes a flow passage provided to communicate the inside and the outside of the rotating shaft, preferably this flow passage is formed through the clutch pin can eliminate the unbalance between the pressure passing through the inner side of the rotating shaft and the pressure passing through the outer side of the rotating shaft. .

Description

VARIABLE CAPACITY ROTARY COMPRESSOR}

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

Figure 2 is an exploded perspective view showing that the eccentric device according to the present invention is separated from the rotating shaft.

3 is a partially enlarged perspective view of the clutch pin shown in the rotating shaft shown in FIG.

4 is a partially enlarged sectional view of FIG. 2 showing a structure in which a clutch pin is coupled to a rotating shaft.

5 is a view showing that the rotating shaft is rotated in the forward compression chamber in the upper 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 is rotated forward so that a compression action is not performed in the lower 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 lower 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 a compression action is not performed in the upper compression chamber by the eccentric apparatus according to 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: clutch hole

90: fixing pin 95: fixing hole

The present invention relates to a capacitively variable rotary compressor, and more particularly, to a capacitively variable rotary compressor that prevents the clutch pin from transmitting the rotational force of the rotary shaft to the eccentric bush from being separated from the rotary shaft.

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 according to 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.

For example, the present applicant has filed a variable displacement rotary compressor in Korean Laid-Open Patent Publication No. 10-2004-0086559. 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 refrigerant gas, and a clutch pin that allows one eccentric bushing to be switched to an eccentric position with respect to the center line of the rotating shaft and another eccentric bushing to a concentric position depending on the rotational direction of the rotating 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.

However, in the conventional variable displacement rotary compressor, since the clutch pin protruding from the rotary shaft changes direction in the forward or reverse direction in the slot formed between the two eccentric bushes in order to change the capacity, the operation that collides at both ends of the slot is repeated. The shock may cause noise to occur because the clutch pin is not fixed in position on the rotating shaft, or the clutch pin may be disengaged from the rotating shaft and become inoperative.

In addition, since the clutch pin receives the pressure of the oil supplied to the inside of the compressor through the rotating shaft from the inside and the pressure of the refrigerant gas supplied to the compression chamber from the outside, the clutch pin flows due to the unbalance of these two pressures. In severe cases, there was a possibility that the clutch pin would slip off the axis of rotation and become inoperative.

The present invention is to solve the above problems of the prior art, an object of the present invention is to provide a variable displacement rotary compressor that allows the clutch pin to be firmly fixed to the rotary shaft.

In addition, another object of the present invention is to provide a variable displacement rotary compressor to solve the pressure imbalance received from the oil and refrigerant gas clutch pin.

Capacity variable rotary compressor according to the present invention for achieving this object, the first and second compression chamber having a different content, the rotation shaft penetrates the two compression chamber and the oil hole is provided therein, the first disposed on the outer peripheral surface of the rotating shaft And a second pin eccentric bush, a slot provided between the two eccentric bushes, and a clutch pin protruding from the rotating shaft so as to be caught by any one of both sides of the slot according to the forward / reverse rotation direction of the rotary shaft. And a flow passage provided to communicate the inside and the outside of the rotation shaft between the first and second compression chambers, preferably, the flow passage is formed through the clutch pin.

In addition, the capacity-variable rotary compressor according to the present invention further comprises a fixing pin for firmly fixing the clutch pin, the rotating shaft is a clutch hole formed in the radial direction, the fixed hole formed in the circumferential direction to communicate with the clutch hole In addition, the clutch pin and the fixing pin is fitted into the clutch hole and the fixing hole, respectively, so that the fixing pin is coupled to the side of the clutch pin.

In addition, a groove having a predetermined width is formed at the rear end of the clutch pin so that the rear end of the fixing pin is fitted into the groove in the rotating shaft.

In addition, the clutch hole and the fixing hole are formed to meet at right angles to each other inside the rotating shaft so that the fixing pin can more firmly fix the clutch pin.

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 generate refrigerant gas. A compression unit 30 for compressing 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 the rotor 23. It includes a rotating shaft 21 extending from the center portion to be rotated forward (or counterclockwise) or counterclockwise (or clockwise) with the rotor (23). The rotary shaft 21 has an oil hole 22 for supplying the lubricating oil stored in the lower portion of the sealed container 10 to the drive unit 20 and the compression unit 30 in the longitudinal direction.

The compression section 30 has a cylindrical housing 33 having a first compression chamber 31 and a second compression chamber 32 having different contents in the upper and lower portions thereof, and the upper and lower ends of the housing 33. Disposed between the first flange 35 and the second flange 36 to rotatably support the rotating shaft 21, and between the first compression chamber 31 and the second compression chamber 32, and the first and the first It includes an intermediate plate 34 to allow the two compression chambers 31 and 32 to be partitioned from each other.

Eccentricity in which the compression operation can be selectively performed only in any one of the first and the second compression chamber (31, 32) in the first and second compression chamber (31, 32) in accordance with the rotation direction of the rotary shaft (21) The device 40 is disposed. The structure and operation of the eccentric device 40 will be described later with reference to FIGS. 2 to 8.

In addition, the first and second compression chambers 31 and 32 are provided with a first roller 37 and a second roller 38 rotatably disposed on the outer circumferential surface of the eccentric device 40, respectively, and in the housing 33 The first and second suction ports 63 and 64 and the first and second discharge ports 65 and 66 (see FIGS. 5 and 7) arranged to communicate with the first and second compression chambers 31 and 32, respectively, 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 refrigerant gas to flow into the compressor, is located only on the suction port side of the first and second suction ports 63 and 64 formed in the housing 33. A flow path switching device 70 for selectively opening and closing the respective suction flow paths 67 and 68 so as to supply the refrigerant gas is provided. Inside the flow path switching device 70, a valve device 71 for operating 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 by a pressure difference 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. 2 is an exploded perspective view showing that the eccentric device 40 according to the present invention is separated from the rotating shaft, Figures 3 and 4 is a partially enlarged perspective view and a cross-sectional view of the clutch pin is coupled to the rotating shaft.

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

The first and second eccentric cams 41 and 42 are integrally protruded in the transverse direction from the outer circumferential surface of the rotation shaft 21, and the first and second eccentric cams 41 and 42 respectively surround the outer surfaces of the first and second eccentric cams 41 and 42. And the 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. Is formed in the circumferential direction. Accordingly, the first and second eccentric bushes 51 and 52 may be caught by the first catching portion 53a or the second catching portion 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).

On the other hand, in a predetermined section of the rotation shaft 21 opposite to the connecting portion 54 formed between the first and second eccentric bushes 51 and 52, a flow path 81 for communicating the inside and the outside of the rotation shaft 21 is formed. The flow path 81 penetrates the rotation shaft 21 to solve the pressure unbalance of the oil passing through the oil hole 22 formed inside the rotation shaft 21 and the refrigerant gas passing through the outside of the rotation shaft 21. It is provided in a ball shape, preferably as shown in Figure 4 is provided on the clutch pin 80 to facilitate the assembly and processing of the eccentric device 40.

The clutch pin 80 is inserted into the clutch hole 85 formed between the first eccentric cam 41 and the second eccentric cam 42 on the rotation shaft 21 so as to protrude from the rotation shaft 21. That is, as shown in FIG. 3, the clutch pin 80 has a head portion 82 caught by the slot 53, and extends from the head portion 82 to be fitted into the clutch hole 85 of the rotation shaft 21. It is made of a body portion 83 to be pulled, a groove 84 having a predetermined width is formed on the rear end of the body portion 83.

The diameter of the head portion 82 has a smaller size than the body portion 83, the diameter of the body portion 83 has a size slightly larger than the diameter of the clutch hole 85 so that the body portion of the clutch pin (80) ( When the 83 is press-fitted into the clutch hole 85 in a clamping manner, the head 82 protrudes from the rotation shaft 21 to act as a clutch in the slot 53. Of course, if the diameter of the body portion 83 and the clutch hole 85 of the clutch pin 80 to the same size, and having a structure to form a thread in the body portion 83 and the clutch hole 85, the clutch pin 80 can be fastened to the clutch hole 85 in a screwing manner.

On the other hand, the clutch pin 80 of the variable displacement rotary compressor according to an embodiment of the present invention is fixed to the inside of the rotary shaft 21 to be firmly fixed so as not to fall by flowing to the rotary shaft 21 even after long-term operation ) Is combined.

That is, as shown in FIG. 3, the clutch pin 80 is inserted into the clutch hole 85 formed between the first eccentric cam 41 and the second eccentric cam 42 to protrude to the rotation shaft 21. Fixing hole 90 for firmly fixing so as not to be separated from the 85 is fitted in the fixing hole (95) formed spaced apart from the clutch hole (85) on the rotating shaft (21). Specifically, the clutch hole 85 is formed in the radial direction toward the center of the rotation shaft 21 on the outer surface of the rotary shaft 21, the fixing hole 95 is formed in the circumferential direction on the outer surface of the rotary shaft 21 21 is in communication with the clutch hole 85 inside. In addition, the fixing hole 95 is formed to intersect the clutch hole 85 at a right angle so that the fixing pin 90 is coupled to the side of the clutch pin 80 at a right angle so that the clutch pin 80 is slot 53. It is possible to effectively prevent the clutch pin 80 from being separated from the clutch hole 85 by the impact generated while repeatedly hitting the first and second locking portions (53a, 53b).

The fixing pin 90 has a wrench groove formed on the front surface of the head 91, a body portion 92 extending from the head portion 91 to be fitted into the fixing hole 95, and a body portion 92. It consists of a coupling portion 93 is extended to fit in the groove 84 of the clutch pin (80).

The diameter of the head 91 is formed larger than the diameter of the fixing hole 95, the diameter of the body portion 92 is the same size as the fixing hole 95, the diameter of the coupling portion 93 is the body It is smaller than the portion 92 and has the same size as the width of the groove 84 of the clutch pin 80. In addition, the body portion 92 and the fixing hole 95 is formed with a screw thread can be screwed together.

Therefore, the clutch pin 80 is pushed into the clutch hole 85 in a state where the first and second eccentric cams 41 and 42 are disposed in the first and second eccentric bushes 51 and 52, respectively. When the fixing pin 90 is fastened to the fixing hole 95 after the 80 is coupled to the rotary shaft 21, the body portion 92 of the fixing pin 90 is screwed to the fixing hole 95 to be fixed. At the same time, the coupling portion 93 of the fixing pin 90 is inserted into the groove 84 of the clutch pin 80 so that the clutch pin 80 is firmly fixed to the rotation shaft 21. In this case, the fixing pin 90 does not protrude from the rotation shaft 21.

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 engaging portion 53a of the 53 causes the first and second eccentric bushes 51 and 52 to rotate together with the rotation shaft 21.

When the clutch pin 80 is rotated in the state of being caught by the first catching portion 53a of the slot 53, as shown in FIG. 5, the first eccentric bush 51 is located at 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. You lose.

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. The first and second eccentric bushes 51 and 52 rotate together with the rotation shaft 21 by being caught by the second locking portion 53b of the slot 53.

When the clutch pin 80 is rotated while being caught by the second locking portion 53b of the slot 53, as shown in FIG. 7, the second eccentric bush 52 is positioned at the center of the rotation shaft 21. The second roller 38 is rotated 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 80 coupled to the clutch hole 85 by the rotation operation of the rotary shaft 21, the first and second eccentric bushes 51 and 52, and the first and second rollers 37 and 38. At the same time, the vibration is continuously transmitted to the clutch pin, and the clutch pin 80 repeatedly collides with the first and second catching portions 53a and 53b of the slot 53. Although 80 may be displaced or separated from the clutch hole 85, the variable displacement rotary compressor of the present invention has a structure in which the fixing pin 90 firmly fixes the side of the clutch pin 80. The clutch pin 80 is able to maintain the coupled state without departing from the clutch hole 85 in position. In addition, since the through-hole 81 is formed in the clutch pin 80 so that the oil and the refrigerant gas are mixed with each other to balance the pressure, the clutch pin 80 has a fine vibration and the vibration due to the vibration. The fixing pin 90 may be prevented from being damaged and the clutch pin 80 may be out of position.

As described in detail above, the capacity variable rotary compressor according to the present invention has a structure in which the clutch pin is firmly coupled to the rotating shaft by the fixing pin, so that the clutch pin is firmly connected to the rotating shaft even when vibration or shock is repeatedly transmitted to the clutch pin. It can maintain a fixed state so that the variable displacement rotary compressor can operate stably.

In addition, the variable displacement rotary compressor according to the present invention has a through hole is formed in the rotating shaft, in particular, the clutch pin to eliminate the unbalance between the oil passing through the inner side of the rotating shaft and the refrigerant passing through the outer side of the rotating shaft, the fine vibration phenomenon of the clutch pin There is an effect that can be prevented due to the fixing pin breakage or deviation of the position of the clutch pin.

Claims (5)

First and second compression chambers having different contents, rotating shafts penetrating the two compression chambers and having oil holes therein, first and second eccentric bushes disposed on the outer circumferential surface of the rotating shaft, and provided between the two eccentric bushes. In the capacity variable rotation compressor having a slot, a clutch pin protruding from the rotating shaft to be caught by any one of the two engaging portions of the slot according to the forward / reverse rotation direction of the rotary shaft, And a flow path provided to communicate the inside and the outside of the rotating shaft between the first and second compression chambers. The method of claim 1, The flow path is a variable displacement rotary compressor, characterized in that formed through the clutch pin. The method according to claim 1 or 2, Further provided with a fixing pin for firmly fixing the clutch pin, The rotating shaft includes a clutch hole formed in a radial direction and a fixing hole formed in a circumferential direction so as to communicate with the clutch hole, and the clutch pin and the fixing pin are fitted into the clutch hole and the fixing hole, respectively, and the fixing pin is connected to the clutch. Capacity variable rotary compressor characterized in that coupled to the side of the pin. The method of claim 3, wherein The rear end of the clutch pin is formed with a groove having a predetermined width so that the rear end of the fixed pin is coupled to the groove in the inside of the rotating shaft coupled capacity variable rotation compressor. The method of claim 4, wherein The clutch hole and the fixing hole is formed so as to meet at a right angle to each other in the interior of the rotating shaft, so that the fixed pin can be more firmly fixed to the clutch pin characterized in that the variable displacement rotary compressor.

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