KR100802024B1 - Variable capacity rotary compressor - Google Patents

Abstract

A variable capacity hermetically sealed rotary compressor is provided to reduce noise caused by collision between a vane and a rotor. A variable capacity hermetically sealed rotary compressor includes a housing(10) having compression chambers(31), rollers(42) installed in the compression chamber to rotate eccentrically, vanes sliding in and out as rollers rotate, guide grooves(44) formed at the housing to guide sliding of each vane, and a control device for controlling movement of vanes with suction pressure and discharge pressure. Each vane is split into a first plate(43a) and a second plate(43b) along the direction of sliding. The first plate and the second plate are folded toward the rotation direction of a roller.

Description

VARIABLE CAPACITY ROTARY COMPRESSOR}

1 is a cross-sectional view showing a variable displacement rotary compressor according to the present invention, showing a state in which the compression operation is performed in the first compression chamber.

FIG. 2 is a cross-sectional view taken along line II-II 'of FIG. 1.

3 is a cross-sectional view showing a variable displacement rotary compressor according to the present invention, showing a state in which the idle rotation is made in the first compression chamber.

4 is a cross-sectional view taken along line IV-IV 'of FIG. 3.

5 is a perspective view showing the configuration of the first vane of the variable displacement rotary compressor according to the present invention.

FIG. 6 is a detailed view of part VI of FIG. 2.

Explanation of symbols on the main parts of the drawings

10: sealed container, 20: electric element,

21: axis of rotation, 30: compression element,

31: the first compression chamber, 32: the second compression chamber,

35: middle plate, 43: first vane,

43a: first plate, 43b: second plate,

44: first vane guide groove, 46: airtight chamber,

53: second vane, 54: second vane home,

56: second airtight chamber, 60: vane control device,

61: connector, 62: high pressure tube,

63: low pressure pipe, 64: on-off valve.

The present invention relates to a variable displacement rotary compressor, and more particularly to a variable displacement rotary compressor capable of varying the compression capacity through the restriction and release of the vane.

A variable displacement rotary compressor for varying the compression capacity by controlling the operation of vanes is disclosed in Korean Patent Publication No. 10-621026 (September 15, 2006).

The rotary compressor of the above publication has a first vane for partitioning the upper compression chamber and a second vane for partitioning the lower compression chamber, and the vane control for varying the compression capacity by selectively restraining or releasing the second vane. With a device. The vane control device is installed at the common side connector connected to the back pressure space of the second vane, the high pressure connector connected to the common side connector, the low pressure side connector connected to the common side connector, and the connection point of these connectors. It includes a three-way valve type back pressure switching valve. The vane control device applies a suction pressure to the back pressure space of the second vane by the switching operation of the back pressure switching valve so that the second vane is constrained or discharge pressure is applied to the back pressure space so that the second vane moves forward and backward.

However, such a rotary compressor maintains the state in which the second vane is retracted (stopped), and when the discharge pressure is applied to the back pressure space of the second vane, the second vane moves toward the compression chamber by the discharge pressure and collides with the roller. There was a problem of crash noise.

The present invention is to solve this problem, it is an object of the present invention to provide a variable displacement rotary compressor to reduce the noise caused by the impact of the vanes and rollers.

The variable displacement rotary compressor according to the present invention for achieving the above object comprises a housing having a compression chamber, a roller installed in the compression chamber so as to eccentrically rotate, a vane moving forward and backward according to the rotation of the roller, and a guide of the vane moving forward and backward. A vane guide groove formed in the housing and a vane control device controlling the operation of the vanes by using suction pressure and discharge pressure, wherein the vanes are divided into each other in the advancing direction and overlapped in the rotational direction of the roller. It characterized in that it comprises a plate.

In addition, the vane advancing direction is characterized in that shifted to the center of rotation of the roller.

In addition, the vane control device includes a connection pipe connected to the vane guide groove, a high pressure pipe connecting the connection pipe and the discharge side of the compressor, a low pressure pipe connecting the connection pipe and the suction side of the compressor, And an on / off valve for allowing the connection pipe to selectively communicate with the low pressure pipe and the high pressure pipe.

In addition, the capacity-variable rotary compressor according to the present invention includes a housing having first and second compression chambers partitioned with each other, first and second rollers installed to eccentrically rotate in the first and second compression chambers, and the first First and second vanes advancing and retreating according to the rotation of the second roller, first and second vane guide grooves formed in the housing for guiding the first and second vanes, and suction and discharge pressures. And a vane control device for controlling the restraint of the first vane by using the first vane, wherein the first vanes include a plurality of plates which are mutually divided in the advancing direction and overlapped in the rotational direction of the first roller. .

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

Capacity variable rotary compressor according to the present invention, as shown in Figure 1, the transmission element 20 installed on the inner upper portion of the sealed container 10, is installed on the inner lower portion of the sealed container 10 and the transmission element 20 and It has a compression element 30 connected via a rotating shaft 21.

The transmission element 20 includes a cylindrical stator 22 fixed to the inner surface of the sealed container 10 and a rotor 23 rotatably installed in the stator 22 and having a central portion coupled to the rotation shaft 21. Include. The transmission element 20 drives the compression element 30 connected by the rotation shaft 21 by rotating the rotor 23 when power is applied.

The compression element 30 is provided in the housing having the first compression chamber 31 and the second compression chamber 32 in the upper part partitioned apart from each other, and in the first and second compression chambers 31 and 32, respectively, And first and second compression units 40 and 50 operated by 21.

The housing of the compression element 30 has a first body 33 and a second compression chamber 32 formed thereon and a second body installed below the first body 33. 34) of the intermediate plate 35 and the first compression chamber 31 provided between the first and second bodies 33 and 34 for partitioning the first compression chamber 31 and the second compression chamber 32; The first and the second installed in the upper portion of the first body 33 and the lower portion of the second body 34 so as to close the upper opening and the lower opening of the second compression chamber 32 and support the rotating shaft 21. Flanges 36 and 37. The rotary shaft 21 penetrates the centers of the first and second compression chambers 31 and 32 and is connected to the compression units 40 and 50 inside the first and second compression chambers 31 and 32.

The first and second compression units 40 and 50 are provided with first and second eccentric parts 41 and 51, first and second, respectively provided on the rotation shafts 21 of the first and second compression chambers 31 and 32, respectively. And first and second rollers 42 and 52 rotatably coupled to the outer surfaces of the first and second eccentric portions 41 and 51 so as to rotate in contact with the inner surfaces of the two compression chambers 31 and 32. The first eccentric portion 41 and the second eccentric portion 51 are arranged opposite to each other so as to maintain a balance.

Each of the first and second compression units 40 and 50 moves forward and backward in the radial direction of each of the compression chambers 31 and 32 according to the rotation of the first and second rollers 42 and 52. It includes a first vane 43 and a second vane 53 for partitioning. As shown in FIGS. 1 and 2, the first and second vanes 43 and the second vanes 53 generally have first and second vane guide grooves 44 formed to be elongated in the radial direction of each compression chamber 31 and 32. 54) to guide the progression. The vane spring 55 presses the second vane 53 toward the second roller 52 so that the second vane 53 partitions the second compression chamber 32 in the second vane guide groove 54. This is installed.

In the rear of the first vane guide groove 44, a sealed chamber 46 is formed to accommodate the rear end of the first vane 43. The sealed chamber 46 is partitioned from the inner space of the sealed container 10 by the intermediate plate 35 and the first flange 36. In addition, the present invention restrains the first vane 43 from being retracted by applying the suction pressure to the sealed chamber 46 or applies the discharge pressure to the sealed chamber 46 so that the first vane 43 is moved forward and backward. The vane control device 60 is provided. The vane control device 60 allows the compression capacity to vary by compressing or idling the side of the first compression chamber 31 by restraining or releasing the first vane 43 in this manner. The detailed configuration and operation of the vane control device 60 will be described later.

Inlets connected to the suction pipes 71 and 72 to allow gas to flow into the first compression chamber 31 and the second compression chamber 32 in the first body 33 and the second body 34 ( 73, see FIG. 2, and discharge ports 75 and 76 are formed to discharge the gas compressed in each of the compression chambers 31 and 32 into the sealed container 10. Therefore, when the compressor is operated, the inside of the sealed container 10 is maintained at a high pressure by the compressed gas discharged through the discharge ports 75 and 76, and the compressed gas inside the sealed container 10 is placed on the top of the sealed container 10. It is discharged to the outside through the discharge pipe 77 provided. The suctioned gas passes through the accumulator 78 and is then guided through the suction pipes 71 and 72 to the suction ports of the respective compression chambers 31 and 32.

As shown in FIG. 1, the vane control device 60 includes a connecting pipe 61, a connecting pipe 61, and a discharge pipe connected directly to the sealed chamber 46 behind the first vane guide groove 44. High pressure pipe 62 for connecting 77, low pressure pipe 63 for connecting the connection pipe 61 and the suction pipe 70, the connection pipe 61 is optional for the high pressure pipe 62 and the low pressure pipe 63 It includes an on-off valve 64 to communicate with. Opening and closing valve 64 is composed of an electric three-way valve is installed at the connection point 61, high pressure pipe 62, low pressure pipe (63).

The operation of the vane control device 60 is performed as follows.

As shown in FIG. 1 and FIG. 2, when the on-off valve 64 operates so that the high pressure tube 61 communicates with the connecting tube 61, the discharge pressure is applied to the sealed chamber 46. Therefore, at this time, since the first vane 43 is pushed toward the first compression chamber 31 by the discharge pressure, the first vane 43 advances and exits according to the eccentric rotation of the first roller 42. On the other hand, as shown in Figures 3 and 4, when the on-off valve 64 is operated so that the low pressure tube 63 communicates with the connecting tube 61, the suction pressure is applied to the closed chamber 46. Therefore, in this case, since the first vane 43 is stopped in the retracted state, idling is performed in the first compression chamber 31.

As such, the present invention can control the restraint of the first vane 43 through the vane control device 60 so that the compression or idling can be performed on the first compression chamber 31 side, so that the compression capacity can be varied. When the first vane 43 is moved forward and backward by applying the discharge pressure behind the first vane guide groove 44, the compression operation is performed in both the first compression chamber 31 and the second compression chamber 32. Large compression is achieved. On the other hand, when the first vane 43 is restrained by applying the suction pressure to the first vane guide groove 44, the idling is performed in the first compression chamber 31, and the compression operation is performed only in the second compression chamber 32. Compression capacity is reduced.

Meanwhile, as illustrated in FIGS. 2 and 5, the first vanes 43 are divided in the advancing direction and overlapped with each other in the rotational direction of the first roller 42. ). The first plate 43a and the second plate 43b overlap each other in a slidable state. In addition, the advancing direction of the 1st vane 43 is arrange | positioned at offset from the rotation center C of the 1st roller 42 and the rotating shaft 21, as shown in FIG. To this end, the first vane guide groove 44 is provided at a position biased toward the suction port 73. And the front end of the 1st plate 43a and the 2nd plate 43b is a round curved surface as shown in FIG.

As shown in FIG. 4, the first vane 43 maintains its retracted state, and as shown in FIG. 2, the discharge pressure is applied to the sealed chamber 46 of the first vane guide groove 44. When the first vane 43 collides forwardly toward the first roller 42, as shown in FIG. 6, the collision force of the first vane 43 is weakened, and the first plate 43a and the second vane 43 are weakened. The plate 43b is to reduce the collision noise by sequentially hitting the outer surface of the first roller 42.

That is, according to the present invention, since the first vane 43 is divided into the first plate 43a and the second plate 43b, the weight of each plate is reduced to about half as compared to the conventional integrated vanes, thereby significantly reducing collision noise. It becomes possible. Even when a collision is made, as shown in FIG. 6, the first plate 43a first strikes the outer surface of the first roller 42, and then the second plate 43b is disposed on the outer surface of the first roller 42 with a slight parallax. Because they collide, the collision force is distributed and collision noise is reduced.

The sequential collision between the first plate 43a and the second plate 43b causes the first roller 42 to eccentrically rotate in the first compression chamber 31 and the first vane 43 to the first roller 42. It is possible by advancing in a direction that is displaced from the geometric center of the circle.

As described in detail above, the capacity-variable rotary compressor according to the present invention is made of a first plate and a second plate in which the first vanes are mutually superimposed, and thus the impact force of the vanes can be made smaller than before. The second flake may collide with parallax so that the collision force is dispersed. Therefore, there is an effect that can significantly reduce the noise due to the impact of the vane and the roller than the conventional.

Claims (6)

A housing equipped with a compression chamber, a roller installed in the compression chamber so as to be eccentrically rotated, a vane moving forward and backward as the roller rotates, a vane guide groove formed in the housing for guiding the vane forward, and a suction pressure and a discharge pressure In the variable displacement rotary compressor comprising a vane control device for controlling the operation of the vane by using, The vanes include a plurality of plates which are mutually divided in the advancing direction and superimposed in the rotational direction of the roller, The plurality of plates is a variable displacement rotary compressor, characterized in that the relative movement. The method of claim 1, And the vane advancing direction is shifted from the center of rotation of the roller. The method of claim 2, The vane control device includes a connection pipe connected to the vane guide groove, a high pressure pipe connecting the connection pipe and the discharge side of the compressor, a low pressure pipe connecting the connection pipe and the suction side of the compressor, A variable displacement rotary compressor, characterized in that it comprises an on-off valve for selectively connecting the connection pipe to the low pressure pipe and the high pressure pipe. A housing having first and second compression chambers separated from each other, first and second rollers installed in the first and second compression chambers so as to be eccentrically rotated, and the first and second rollers respectively move forward and backward according to rotation of the first and second rollers. Restraining the first vane using first and second vanes, first and second vane guide grooves formed in the housing for guiding the first and second vanes, and suction and discharge pressures. In the variable displacement rotary compressor comprising a vane control device for controlling, The first vane includes a plurality of plates divided into each other in the advancing direction and superimposed in the rotational direction of the first roller, The plurality of plates is a variable displacement rotary compressor, characterized in that the relative movement. The method of claim 4, wherein The variable displacement rotary compressor according to claim 1, wherein the retraction direction of the first vane is shifted from the rotation center of the first roller. The method of claim 5, The vane control device includes a connecting pipe connected to communicate with the first vane guide groove, a high pressure pipe connecting the connection pipe and the discharge side of the compressor, a low pressure pipe connecting the connection pipe and the suction side of the compressor; And an open / close valve for allowing the connection pipe to selectively communicate with the low pressure pipe and the high pressure pipe.

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