KR100780780B1 - Variable capacity rotary compressor - Google Patents

Abstract

Disclosed is a variable displacement rotary compressor capable of preventing abnormal wear on the outer surface of a roller. The variable displacement rotary compressor includes a housing having first and second compression chambers intersected with each other, first and second rollers respectively installed in the first and second compression chambers, and the first roller while advancing in the radial direction of the first roller. A first vane partitioning the compression chamber, a second vane and a third vane partitioned in the radial direction of the second roller while being slidably supported and mutually slidably supported, and a third vane for controlling the compression capacity. And a vane control device for restraining or restraining, and the second vane includes an extension extending to cover the tip of the third vane.

Description

VARIABLE CAPACITY ROTARY COMPRESSOR}

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

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

3 is a cross-sectional view taken along line III-III ′ of FIG. 1.

4 is a cross-sectional view showing the configuration of the capacity variable rotary compressor according to the first embodiment of the present invention, showing a state in which the idle rotation is performed in the second compression chamber.

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

6 is a cross-sectional view showing the configuration of a capacity variable rotary compressor according to a second embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10: airtight container, 20: electric mechanism part,

21: rotating shaft, 30: compressor section,

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

42: first roller, 43: first vane,

52: second roller, 53: second vane,

53a: extension, 54: third vane,

70: vane control, 71: cylinder,

72: piston, 76: flow path variable valve.

The present invention relates to a variable displacement rotary compressor, and more particularly to a variable displacement rotary compressor that can vary the compression capacity through the control of the vane forward and backward movement.

Korean Unexamined Patent Publication No. 10-2004-0021140 discloses a variable displacement rotary compressor capable of varying the compression capacity by controlling the vane movement. The rotary compressor has a housing in which a cylindrical compression chamber is formed, a roller which eccentrically rotates in the compression chamber of the housing, and vanes which retract in the radial direction of the roller. The vane is composed of a first vane of the upper and second vanes separated from each other, the first vane side is provided with a restraining means for restraining the first vane so as to space the first vane to the outer surface of the roller, if necessary It is. The rotary compressor performs idling when the first vane is restrained by the restraining means and performs a compression operation when the first vane is not restrained by the restraining means. Therefore, the compression capacity can be varied by restraining or releasing the first vane as necessary.

However, this rotary compressor has a structure in which the vanes in contact with the roller are separated into the first vane and the second vane. Therefore, abnormal wear may occur on the outer surface of the roller in contact with the boundary of the first vane and the second vane.

The present invention is to solve these problems, an object of the present invention is to provide a variable displacement rotary compressor to prevent abnormal wear of the outer surface of the roller.

The variable capacity rotary compressor according to the present invention for achieving this object comprises a housing having first and second compression chambers partitioned from each other, first and second rollers respectively installed in the first and second compression chambers, A first vane that partitions the first compression chamber while advancing in a radial direction of the first roller, a second vane that is slidably supported and partitions the second compression chamber while advancing in a radial direction of the second roller; And a vane control device for restraining or releasing the third vane for controlling the compression capacity, wherein the second vane includes an extension extending to cover the tip of the third vane. do.

The tip of the second vane is in contact with the outer surface of the second roller and has a width corresponding to the height of the second roller.

The front end of the third vane is in close contact with the rear end of the extension part and has a width corresponding to the rear end of the extension part.

The vane control device includes a cylinder installed in the housing on the third vane side, a piston installed in the cylinder so as to be retractable and connected to the third vane, a first flow path communicating with the inside of the cylinder, and A second passage connecting the discharge side and the first passage, a third passage connecting the suction side of the compressor and the first passage, and a passage provided at a point where the first, second, and third passages are interconnected. It characterized in that it comprises a variable valve.

The width of the third vane is smaller than the width of the second vane.

The variable displacement rotary compressor according to the present invention further comprises: a housing having a compression chamber, a roller installed in the compression chamber, first vanes and a first slide which partitions the compression chamber while radially advancing the roller and is slidably supported. And a vane control device for restraining or restraining the second vane for controlling the compression capacity, wherein the first vane includes an extension extending to cover the tip of the second vane. .

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

1 to 5 show a variable displacement rotary compressor according to a first embodiment of the present invention. As shown in FIG. 1, the variable displacement rotary compressor of the first embodiment is installed at an inner upper portion of the sealed container 10 and an inner lower portion of the sealed container 10, and It is provided with a compression mechanism (30) connected via a rotating shaft (21).

Power mechanism 20 is a cylindrical stator 22 is fixed to the inner surface of the sealed container 10, the inside of the stator 22 is rotatably installed, the center of the rotor 23 coupled to the rotary shaft 21 Include. The rotor 23 rotates according to the power supply, and the rotor 23 rotates the rotary shaft 21 to drive the compression mechanism unit 30.

As shown in FIGS. 1 to 3, the compression mechanism unit 30 includes a housing having a first compression chamber 31 and a second compression chamber 32 partitioned with each other, and a first and a second to compress gas. First and second compression devices 40 and 50 are provided in the two compression chambers 31 and 32, respectively.

The housing has a first body 33 formed with a cylindrical first compression chamber 31, a second compression chamber 32 formed with a cylindrical shape, and a second body 34 installed below the first body 33. , An intermediate plate 35 interposed between the first and second bodies 33 and 34 to partition the first compression chamber 31 and the second compression chamber 32, and an upper side of the first compression chamber 31. First and second mounting on the upper part of the first body 33 and the lower part of the second body 34 so as to close the 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 center of the first and second compression chambers 31 and 32 to operate the compression devices 40 and 50 in the first and second compression chambers 31 and 32.

The first and second compression apparatuses 40 and 50 include first and second eccentric parts 41 and 51 provided on the outer surfaces of the rotary shafts 21 of the respective compression chambers 31 and 32, and the respective compression chambers 31 and 32. 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 surface. The first eccentric portion 41 and the second eccentric portion 51 provided on the outer surface of the rotating shaft 21 are eccentric in opposite directions. This is to minimize the change of the rotational torque and reduce the occurrence of vibration when the rotating shaft 21 rotates by maintaining the balance on both sides.

In addition, the first compression device 40 includes a first vane 43 which partitions the first compression chamber 31 while advancing in the radial direction of the first compression chamber 31 as the first roller 42 rotates, It includes a first vane spring 44 for pressing the first vane 43 toward the first roller 42.

In addition, the second compression device 50 partitions the second compression chamber 32 while advancing in the radial direction of the second compression chamber 32 in accordance with the rotation of the second roller 52, and the surfaces in contact with each other are slidably supported. And a second vane 53 and a third vane 54, and a second vane spring 55 for pressing the second vane 53 toward the second roller 52. Therefore, the second compression chamber 32 is partitioned by the second vane 53 having a relatively large width and the third vane 54 having a relatively small width. The third vane 54 is controlled to move forward and backward by the vane control device 70 that varies the compression capacity by restraining or restraining the third vane 54. The detailed structure of the vane control apparatus 70 is mentioned later.

In addition, as shown in FIGS. 1 and 5, the second vane 53 has a third vane from the top of the tip so that the tip of the third vane 54 does not come into contact with the outer surface of the second roller 52. An extension part 53a extended to cover the tip of 54 is provided. Therefore, since the tip of the second vane 53 has a vertical width corresponding to the height of the second roller 52, only the tip of the second vane 53 comes into contact with the outer surface of the second roller 52. The front end of the third vane 54 has an upper and lower width corresponding to the rear end of the extension part 53a so as to be in close contact with the rear end of the extension part 53a of the second vane 53 so that airtightness can be maintained. This prevents abnormal wear on the outer surface of the second roller 52 by making the outer surface of the second roller 52 uniformly contact the front end of the second vane 53 having the extension 53a during the compression operation. It is to be done.

In addition, it is possible to prevent collision noise by preventing the tip of the third vane 54 from coming into contact with the second roller 52 in the process of restraining or restraining the third vane 54 for changing the capacity. .

As shown in FIGS. 2 and 3, the first and second bodies 33 and 34 respectively include first and second suction holes 61 through which gas is introduced into the first and second compression chambers 31 and 32. 62 are formed, respectively, and the first and second suction pipes 15 and 16 are connected to the suction ports 61 and 62, respectively. The first and second suction pipes 15 and 16 branch off from the refrigerant suction pipe 14 extending from the accumulator 13, as shown in FIG. In addition, a first discharge port 63 and a second discharge port 64 are provided in the first flange 36 and the second flange 37 at the upper side to discharge the pressurized gas from the compression chambers 31 and 32, respectively. Is formed. 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 first and second discharge ports 63 and 64, and the compressed gas inside the sealed container 10 is sealed container ( 10) is guided to the outside through the discharge pipe 12 provided in the upper portion.

1 and 3, the vane control device 70 includes a cylinder 71 provided at the rear end side of the third vane 54 and a cylinder 71 to retreat in the advancing direction of the third vane 54. A piston 72 is installed in the chamber and connected to the rear end of the third vane 54. In addition, the vane control device 70 includes a first pressure control tube 73a connected to the rear end of the cylinder 71 so as to form a first flow path 73 communicating with the inside of the cylinder 71, the discharge side of the compressor and the first A second pressure control pipe 74a branched from the discharge pipe 12 and connected to the first pressure control pipe 73a to form a second flow path 74 for communicating the flow path 73, and a suction side of the compressor; A third pressure regulating tube 75a separated from the refrigerant suction pipe 14 and connected to the first pressure regulating tube 73a to form a third passage 75 communicating with the first passage 73; And a flow path variable valve 76 installed at a point where the second and third pressure control pipes 73a, 74a, and 75a are connected. The flow path variable valve 76 may be formed of a conventional three-way valve operated by an electric control signal.

The following describes the operation of such a variable displacement rotary compressor.

As shown in FIG. 1, when the operation of the compressor is performed while the second flow path 74 is in communication with the first flow path 73 by the operation of the flow path variable valve 76, the vane control device 70 may operate. Since the pressure on the discharge side acts in the cylinder 71, the piston 72 presses the third vane 54. Therefore, the tip of the third vane 54 is in close contact with the rear end of the extension portion 53a of the second vane 53.

In addition, since the first vane 43 is pressurized by the first vane spring 44, the first vane 43 partitions the first compression chamber 31 while advancing with the rotation of the first roller 42. Since the second vane spring 55 is pressed, the second compression chamber 32 is partitioned while advancing with the third vane 54. Therefore, at this time, since the compression operation is performed in both the first compression chamber 31 and the second compression chamber 32, the compression capacity is maximized.

As shown in FIG. 4, when the operation of the compressor is performed while the third flow path 75 communicates with the first flow path 73 by the operation of the flow path variable valve 76, the vane control device 70 Since the pressure on the suction side acts in the cylinder 71, the piston 72 retreats, and the tip of the third vane 54 is the rear end of the extension 53a of the second vane 53 by the retraction of the piston 72. Spaced apart from. That is, at this time, only the second vane 53 is advanced and the third vane 54 is restrained by the vane control device 70 to maintain the stopped state at the rear. Therefore, a space is spaced between the extension part 53a of the second vane 53 and the tip of the third vane 54 so that the second compression chamber 32 is idle and the compression capacity is reduced. When the volume of the first compression chamber 31 and the volume of the second compression chamber 32 are the same, since the compression is not performed in the second compression chamber 32, the compression capacity is 50% of the maximum compression capacity.

In the present invention, when the volume of the first compression chamber 31 and the volume of the second compression chamber 32 are different, the variable range of the compression capacity can be varied. That is, when the ratio of the volume of the first compression chamber 31 to the volume of the second compression chamber 32 is 40:60 and the idling of the second compression chamber 32 is performed, the compression capacity is 40% of the maximum compression capacity. do. When the volume ratio of the first compression chamber 31 and the second compression chamber 32 is 30:70 and the idling of the second compression chamber 32 is performed, the compression capacity is 30% of the maximum compression capacity.

In addition, the present invention can further vary the compression capacity variable range from the minimum to the maximum by controlling the operation cycle of the vane control device 70. In other words, by repeating the restraining and restraining of the third vane 54 to repeat the compression operation and the idle operation on the second compression chamber 32 side, it is possible to further diversify the variable range of the compression capacity.

For example, when the volume ratio of the first compression chamber 31 and the second compression chamber 32 is 50:50, when the restraint of the third vane 54 is set to 50%, the compression capacity is compared to the maximum compression capacity. 75%, and in the same case, when the restraint of the third vane 54 is set to 80%, the compression capacity becomes 60% of the maximum compression capacity.

When the volume ratio of the first compression chamber 31 and the second compression chamber 32 is 30:70, if the restraint of the third vane 54 is set to 50%, the compression capacity becomes 65% of the maximum compression capacity. In the same case, when the restraint of the third vane 54 is set to 80%, the compression capacity becomes 44% of the maximum compression capacity.

Figure 6 shows a variable displacement rotary compressor according to a second embodiment of the present invention. The second embodiment is a vane-controlled capacity variable rotary compressor having one compression chamber. In the second embodiment, the compression mechanism 100 includes a housing 103 having one compression chamber 101, a roller 103 and an roller eccentrically rotating in the compression chamber 101 by the rotation of the rotating shaft 102. The first vane 110 and the second vane 120 which partitions the compression chamber 101 while advancing in the radial direction thereof and are slidably supported. In addition, the vane control device 130 for restraining or restraining the second vane 120 for controlling the compression capacity.

The first vane 110 of the second embodiment extends from the top of the tip to cover the tip of the second vane 120 to prevent the second vane 120 from contacting the outer surface of the roller 103. An extension 111 is provided. Therefore, since the tip of the first vane 110 has a vertical width corresponding to the height of the roller 103, only the tip of the first vane 110 contacts the outer surface of the roller 103. The tip of the second vane 120 has an upper and lower width corresponding to the rear end of the extension 111 so that the tip of the second vane 120 may be in close contact with the rear end of the extension 111 of the first vane 110. These vanes 110 and 120 have the same structure as that of the second vane 53 and the third vane 54 in the above-described first embodiment. Therefore, the abrasion and collision noise of the roller 103 can be prevented through the configuration of the vanes 110 and 120.

The vane control device 130 includes a cylinder 131 installed in the housing on the side of the second vane 120, and a piston 132 installed in the cylinder 131 so as to be retractable and connected to the second vane 120. In addition, the first passage 133 communicating with the inside of the cylinder 131, the second passage 134 connecting the discharge side of the compressor and the first passage 133, and the suction side of the compressor and the first passage 133. And a flow path variable valve 136 installed at a point where the third flow path 135, the first, the second flow path, and the third flow paths 133, 134, and 135 are connected to each other. The vane control device 130 is substantially the same as the vane control device 70 of the first embodiment. Therefore, more detailed description thereof will be omitted.

In the variable capacitance operation of the second embodiment, the compression and idle operation are repeated by restraining or restraining the second vane 120 through the control of the vane control device 130. That is, if the restraint of the second vane 120 is set to 50%, the compression capacity is 50% of the maximum compression capacity, and if the restraint of the second vane 120 is set to 70%, the compression capacity is 30% of the maximum compression capacity. It becomes%

As described in detail above, the capacity-variable rotary compressor according to the present invention includes an extension portion extending to cover the tip of the third vane, so that the tip of the third vane can be prevented from contacting the roller. There is an effect that can prevent abnormal wear of the outer surface of the roller.

Claims (9)

A housing having first and second compression chambers separated from each other, first and second rollers respectively provided in the first and second compression chambers, and the first compression chamber being moved forward and backward in the radial direction of the first roller. A first vane for partitioning, a second vane and a third vane partitioned in the radial direction of the second roller while being slidably supported and mutually slidably supported, and the third vane for compression capacity control; And a vane control device for restraining or restraining, wherein the second vane includes an extension extending to cover the tip of the third vane. The method of claim 1, And the tip of the second vane is in contact with the outer surface of the second roller and has a width corresponding to the height of the second roller. The method of claim 2, The front end of the third vane is in close contact with the rear end of the extension portion having a width corresponding to the rear end of the extension variable displacement compressor. The method of claim 1, The vane control device includes a cylinder installed in the housing on the third vane side, a piston installed in the cylinder so as to be retractable and connected to the third vane, a first flow path communicating with the inside of the cylinder, and A second passage connecting the discharge side and the first passage, a third passage connecting the suction side of the compressor and the first passage, and a passage provided at a point where the first, second, and third passages are interconnected. A variable displacement rotary compressor comprising a variable valve. The method of claim 1, A variable displacement rotary compressor, characterized in that the width of the third vane is smaller than the width of the second vane. A housing having a compression chamber, a roller installed in the compression chamber, first vanes and second vanes which are slidably supported while partitioning the compression chamber while advancing in the radial direction of the roller, and for controlling the compression capacity; And a vane control device for restraining or releasing the second vane, wherein the first vane includes an extension extending to cover the tip of the second vane. The method of claim 1, The first vane is in contact with the outer surface of the roller and the variable displacement rotary compressor characterized in that it has a width corresponding to the height of the roller. The method of claim 7, wherein The front end of the second vane is in close contact with the rear end of the extension portion having a width corresponding to the rear end of the extension variable displacement compressor. The method of claim 6, The vane control device includes a cylinder installed in the housing on the second vane side, a piston installed in the cylinder to be retractable and connected to the second vane, a first flow passage communicating with the inside of the cylinder, and a discharge side of the compressor. A second flow path connected to the first flow path, a third flow path connecting the suction side of the compressor and the first flow path, and a flow path provided at a point where the first, second, and third flow paths are connected to each other; A variable displacement rotary compressor comprising a valve.

Images