KR100786994B1 - Rotary compressor - Google Patents

Abstract

A variable displacement rotary compressor is provided to extend service life of vanes in the compressor and to improve reliability in operating vanes by a constant supply of lubricant to a sealed compartment of the compressor. A variable displacement rotary compressor has a compression chamber, a cylinder(30) having vane guides(45,56) extended outward from the inner wall of the compressor chamber and vane slots(44,54) extended from vane guides to sealed space(46), rollers(42,52) rotating eccentrically to compress refrigerant, vanes(43,53) in vane slots partitioning compression chambers by making contacts with outer surface of the roller, a vane control unit(60) applying either suction pressure or discharge pressure to the sealed space, and a pipe(61) connecting the vane control unit and the sealed space as well as storing lubricant supplied to the sealed space.

Description

Rotary compressors {ROTARY COMPRESSOR}

1 is a vertical sectional view showing a first embodiment of a rotary compressor according to the present invention;

2 is a horizontal cross-sectional view taken along the line II-II of FIG.

3 is a vertical sectional view showing a second embodiment of a rotary compressor according to the present invention;

4 is a vertical sectional view showing a third embodiment of a rotary compressor according to the present invention.

Explanation of symbols on the main parts of the drawings

1: sealed container 10: electric element

12: stator 13: rotor

20: compression element 30: cylinder

31: first compression chamber 32: second compression chamber

35: intermediate plate 40: first compression unit

42: first roller 43: the first vane

44: first vane slot 45: first vane guide portion

46: sealed chamber 47: magnet

48: trim 50: second compression unit

52: second roller 53: second vane

54: second vane slot 56: second vane guide portion

60: first vane control unit 61: connection piping

62: high pressure piping 63: low pressure piping

64: valve 80: oil separator

The present invention relates to a rotary compressor, and more particularly to a variable displacement rotary compressor.

In general, a cooling device applied to an air conditioner or a refrigerator adopts a variable capacity rotary compressor that allows the cooling capacity to be varied so that the cooling capacity of the refrigerant is varied while the compression capacity of the refrigerant is changed for energy saving purposes. .

Such a variable displacement rotary compressor, as disclosed in Korean Patent Laid-Open Publication No. 2004-0021140, has a housing in which a compression chamber is formed, a rotating shaft having an eccentric portion which rotates in the compression chamber, and an eccentric portion having an outer surface in contact with an inner surface of the compression chamber. A roller rotatably installed on the outer surface, a vane provided in the housing so as to retreat in the radial direction of the compression chamber in a state in which the tip thereof is in contact with the outer surface of the roller when the roller rotates, and restraining means for restraining the vane.

The restraining means is provided with a cylinder coupled to the outside of the housing to restrain the vanes by the pressure of the suction side and the discharge side of the rotary compressor, and is installed in the cylinder so as to be able to move back and forth in the direction of operation of the vane. A piston configured to communicate with the inside of the cylinder, a first flow passage formed to communicate with the interior of the cylinder, a second flow passage provided to communicate the discharge side of the rotary compressor, and a first flow passage formed therein; And a flow path variable valve installed at a point where the third flow path and the first, second and third flow paths are connected to each other.

Here, the cylinder forms a sealed chamber in the rear region of the vane coupling groove in which the vanes are accommodated. The pressure applied to the sealed chamber is controlled by operating the flow path variable valve to control the operation of the vane. When high pressure is applied to the sealed chamber, the lubricating oil discharged to the discharge side of the compressor is supplied to the sealed chamber. When the low pressure is applied to the sealed chamber, the compressed medium and the lubricating oil remaining in the sealed chamber are discharged to the suction side of the compressor so that no lubricating oil remains.

However, if low pressure is applied to the sealed chamber of the conventional rotary compressor and then the high pressure is applied again, it takes a predetermined time until the lubricant is supplied to the sealed chamber again, which may cause wear of the vane.

Accordingly, an object of the present invention is to provide a rotary compressor that can prolong the life of the vanes by preventing the wear of the vanes by continuously supplying the lubricating oil to the sealed chamber.

According to the present invention, in the rotary compressor, a compression chamber is formed, and a vane slot comprising a vane guide portion recessed outward from an inner wall surface of the compression chamber and a sealed chamber extending from the vane guide portion. Having a cylinder; A roller which eccentrically rotates in the compression chamber to compress the compressed medium; A vane receivably received in the vane slot and contacting the outer surface of the roller to define the compression chamber; A vane control unit which applies either the suction pressure of the compressed medium flowing into the compression chamber and the discharge pressure of the compressed medium compressed in the compression chamber to the closed chamber; It is achieved by connecting the vane control unit and the hermetic chamber, and comprising a connection pipe in which the lubricating oil supplied to the hermetic chamber is stored.

The vane control unit may include: a low pressure pipe branched from a suction pipe into which the compressed medium flows into the compression chamber; A high pressure pipe branched from a discharge pipe from which the compressed medium compressed in the compression chamber flows out of the compression chamber; Preferably, the low pressure pipe and the high pressure pipe may include a valve for selectively communicating with the connection pipe.

It is preferable that the valve is disposed above the closed chamber.

The apparatus may further include an oil separator provided in one region of the connection pipe to separate the compressed medium and the lubricating oil.

On the other hand, the above object is, according to the present invention, the first vane is formed to form a mutually partitioned first compression chamber and the second compression chamber, the first vane recessed toward the outside from the inner wall surface of the first compression chamber and the second compression chamber A rotary compressor having a cylinder having a slot and a second vane slot, wherein the first vane slot extends from a first vane guide portion recessed outwardly from an inner wall surface of the compression chamber and from the first vane guide portion. Consisting of closed rooms; First and second rollers eccentrically rotating in the first compression chamber and the second compression chamber to compress the compressed medium; A first vane and a second vane, which are accommodated in the first vane slot and the second vane slot, and which contact the outer surfaces of the first roller and the second roller to partition the first compression chamber and the second compression chamber; and; A vane control unit which applies either the suction pressure of the compressed medium flowing into the first compression chamber and the discharge pressure of the compressed medium compressed in the first compression chamber to the closed chamber; The vane control unit and the sealed chamber may be connected to each other, and may be achieved by including a connection pipe in which lubricant oil supplied to the sealed chamber is stored.

The vane control unit may include: a low pressure pipe branched from a suction pipe into which the compressed medium flows into the compression chamber; A high pressure pipe branched from a discharge pipe from which the compressed medium compressed in the compression chamber flows out of the compression chamber; Preferably, the low pressure pipe and the high pressure pipe may include a valve for selectively communicating with the connection pipe.

It is preferable that the valve is disposed above the closed chamber.

The apparatus may further include an oil separator provided in one region of the connection pipe and separating the compressed medium and the lubricating oil.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

As shown in FIG. 1, the rotary compressor according to the present invention is provided with an electric element 10 installed on the inner upper part of the hermetic container 1 and an inner lower part of the hermetic container 1, and the electric element 10 and the rotating shaft. It has a compression element 20 connected via 11.

The transmission element 10 includes a cylindrical stator 12 fixed to the inner surface of the sealed container 1 and a rotor 13 rotatably installed in the stator 12 and having a central portion coupled to the rotating shaft 11. Include. The transmission element 10 drives the compression element 20 connected by the rotation shaft 11 by rotating the rotor 13 when power is applied.

The compression element 20 is in the cylinder 30 having the first compression chamber 31 and the second compression chamber 32 in the upper section and the first and second compression chambers 31 and 32, respectively. It includes a first and second compression unit (40, 50) is provided and operated by the rotary shaft (11).

The cylinder 30 has a first body 33 on which the first compression chamber 31 is formed, and a second body 34 on which the second compression chamber 32 is formed and installed below the first body 33. And the intermediate plate 35 provided between the first and second bodies 33 and 34 for the division of the first compression chamber 31 and the second compression chamber 32, and the first compression chamber 31. The first and the second mounted on 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 11. Two flanges 36 and 37. The rotary shaft 11 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 include first and second eccentric parts 41 and 51 provided on the rotary shafts 11 of the first and second compression chambers 31 and 32, respectively. First and second rollers 42 and 52 rotatably coupled to the outer surfaces of the first and second eccentric portions 41 and 51 to rotate in contact with the inner wall surfaces of the second compression chambers 31 and 32, respectively. do. The first eccentric portion 41 and the second eccentric portion 51 are arranged opposite to each other so as to maintain a balance. Here, the first and second rollers 42 and 52 eccentrically rotate inside the first and second compression chambers 31 and 32 to compress the compressed medium.

Further, the first and second compression units 40 and 50 move forward and backward in the radial direction of the respective compression chambers 31 and 32 according to the rotation of the first and second rollers 42 and 52, respectively. And a first vane 43 and a second vane 53 which define 32. As shown in FIGS. 1 and 2, the first and second vanes 43 and the second vanes 53 have first and second vane slots 44 and 54 formed to be elongated in the radial direction of each of the compression chambers 31 and 32. ) Is guided to advance and retreat. The first vane 43 and the second vane 53 are in contact with the outer surfaces of the first roller 42 and the second roller 52, respectively, to open the first compression chamber 31 and the second compression chamber 32. Compartment.

The first and second vanes 33 and 34 accommodate the first and second vanes 43 and 53, and the first and second vanes guide the first and second vanes 43 and 53 to be accessible. Slots 44 and 54 are formed.

The first vane slot 44 includes a first vane guide portion 45 for guiding the first vanes 43 on an inner wall surface of the first compression chamber 31 and an outer end region of the first vane guide portion 45. In the closed chamber 46 having a larger thickness than the thickness of the first vane guide portion 45.

The first vane guide portion 45 has a thickness similar to that of the first vane 43 on the inner wall surface of the first compression chamber 31 and is recessed toward the outside. The first vane guide part 45 accommodates the first vane 43 and serves to guide the first vane 43 to be accessible.

The sealed chamber 46 has a thickness larger than the thickness of the first vane guide portion 45 by a predetermined expansion thickness in the outer end region of the first vane guide portion 45. Here, the trim part 48 which has been chamfered is formed in the boundary area between the sealed chamber 46 and the 1st vane guide part 45. As shown in FIG. By forming the trim 48, it is possible to give reliability to the operation of the first vane 43. The sealed chamber 46 is formed in the process of processing the trim 48 of the first vane slot 44.

The sealed chamber 46 is partitioned by the intermediate plate 35 and the first flange 36. Here, the rear end of the first vane 43 may be formed of a curved surface corresponding to the inner surface shape of the sealed chamber 46. In addition, when the first vane 43 is fully retracted, the first vane 43 is attached and fixed to the rear of the sealed chamber 46 which is in contact with the rear end of the first vane 43 to prevent the shaking of the first vane 43. A magnet 47 for preventing can be installed. The rear end of the first vane 43 is curved to allow the rear end of the first vane 43 to be in close contact with the magnet 47 when the first vane 43 retreats.

In addition, the present invention restrains the first vane 43 in a retracted state by applying a suction pressure of the compressed medium flowing into the first compression chamber 31 into the sealed chamber 46 or in the sealed chamber 46. A first vane control unit 60 is provided to advance and retreat the first vane 43 by applying the discharge pressure of the compressed medium compressed in the first compression chamber 31. The first vane control unit 60 is configured to constrain or release the first vane 43 in this manner so that compression or idling is performed on the first compression chamber 31 side to vary the compression capacity of the compressor. The detailed configuration and operation of the first vane control unit 60 will be described later.

The second vane slot 54 is recessed from the inner wall surface of the second compression chamber 32 toward the outside to guide the second vane 53 and the second vane 53. It consists of the vane spring accommodating part 57 provided with the vane spring 55 which presses the 2nd vane 53 toward the 2nd roller 52 so that the 2nd compression chamber 32 may be partitioned.

On the other hand, the lower region of the airtight container (1) is formed with an oil storage unit (3) for storing the lubricating oil, the second flange 37, the oil supply hole (37a) for supplying lubricating oil to the second vane (53) Formed. The oil supply hole 37a penetrates one region of the second flange 37 to communicate the oil reservoir 3 and the second vane slot 54. The oil supply hole 37a is preferably formed in the vane spring receiving portion 57 so that the second vane 53 can be opened and closed while reciprocating. Lubricant is supplied to the second vane slot 54 when the oil supply hole 37a is opened by the reciprocating movement of the second vane 53. Thus, by preventing the wear of the second vane 53, it is possible to prevent the wear of the second vane 53 to extend the life, it is possible to improve the reliability in operation.

Inlets connected to the suction pipes 71 and 72 to allow the compressed medium 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 and discharge ports 75 and 76 are formed so that the compressed medium compressed in each of the compression chambers 31 and 32 is discharged into the sealed container 1. Therefore, when the rotary compressor is operated, the inside of the sealed container 1 is maintained at a high pressure by the pressure of the compressed medium discharged through the discharge ports 75 and 76, and the compressed medium in the sealed container 1 is sealed. (1) It is guided to the outside through the discharge pipe 77 provided in the upper portion. Meanwhile, the compressed medium to be sucked passes through the accumulator 78 and is guided to the suction ports of the respective compression chambers 31 and 32 through the suction pipes 71 and 72.

As shown in FIG. 1, the first vane control unit 60 includes a low pressure pipe 63 branched from a suction pipe 70 into which the compressed medium flows into the first compression chamber 31, and a first compression chamber. The compressed medium compressed in (31) selectively branches the high pressure pipe (62), the low pressure pipe (63), and the high pressure pipe (62) branched from the discharge pipe (77) flowing out of the first compression chamber (31). And a valve 64 communicating with a connecting pipe 61 to be described later. The valve 64 is composed of an electric three-way valve that is installed at the point where the connection pipe 61, high pressure pipe 62, low pressure pipe 63 is connected. An outlet of the connection pipe 61 is connected to the first flange 36, and a communication passage 36a is formed in the first flange 36 to directly connect the connection pipe 61 and the sealed chamber 46. That is, the sealed chamber 46 is provided in the rear region of the first vane slot 44, the connecting pipe 61 is connected to the first flange 36 side to be in direct communication with the sealed chamber 46. Here, the valve 64 is preferably disposed above the sealed chamber 46.

The rotary compressor according to the present invention includes a connecting pipe 61 for communicating the valve 64 and the hermetic chamber 46. The connection pipe 61 may be provided with an upward inclination toward the valve 64 from the sealed chamber 46 as shown in FIG. 1. However, as shown in FIG. 3, the connecting pipe 61a may be provided upwardly bent from the closed chamber 46 toward the valve 64. In addition, the lubricating oil is stored in the connection pipe 61. When the high pressure pipe 62 is opened by the valve 64, the lubricating oil stored in the connection pipe 61 flows into the sealed chamber 46 and is supplied to the first vane 43. In addition, some of the lubricating oil introduced into the sealed chamber 46 is connected to the pipe through the high pressure pipe 62 in the process of being discharged through the discharge pipe 77 together with the compressed medium compressed in the first compression chamber 31 ( 61) to flow back. On the other hand, when the low pressure pipe 63 is opened by the valve 64, the compressed medium remaining in the connection pipe 61 moves to the low pressure pipe 63. Here, since the valve 64 is disposed above the sealed chamber 46, the lubricating oil remaining in the connecting pipe 61 does not move to the low pressure pipe 63. When the high pressure pipe 62 is opened again from the valve 64, the lubricating oil remaining in the connection pipe 61 may immediately flow into the sealed chamber 46 and may be supplied to the first vane 43.

In addition, the rotary compressor according to the present invention may further include an oil separator 80 provided in one region of the connection pipe 61b to separate the compressed medium and the lubricating oil in layers. . The oil separator 80 moves the compressed medium remaining in the sealed chamber 46 and the connecting pipe 61b when the valve 64 is switched from the high pressure pipe 62 to the low pressure pipe 63 to the low pressure pipe 63. And the lubricating oil is separated and prevented from moving to the low pressure pipe (63). When the valve 64 is switched from the low pressure pipe 63 to the high pressure pipe 62 again, the lubricant remaining in the oil separator 80 and the connection pipe 61b is immediately supplied to the sealed chamber 46.

Hereinafter, the operation of the rotary compressor according to the present invention will be described with reference to FIGS. 1 and 2.

First, when the valve 64 is operated so that the high pressure pipe 62 communicates with the connecting pipe 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 retreats according to the eccentric rotation of the first roller 42. Here, the lubricating oil stored in the connection pipe 61 flows into the sealed chamber 46 and is supplied to the first vane 43. Thus, by continuously supplying lubricating oil to the sealed chamber to prevent the wear of the vanes to extend the life of the vanes, it is possible to improve the operational reliability of the vanes.

Then, when the valve 64 is operated so that the low pressure pipe 63 communicates with the connecting pipe 61, the suction pressure is applied to the sealed 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. When the first vane 43 is retracted and stopped (restrained), since the rear end of the first vane 43 is attached to the magnet 47, the shaking of the first vane 43 is prevented. Here, since the valve 64 is disposed above the sealed chamber 46, the lubricating oil remaining in the connecting pipe 61 does not move to the low pressure pipe 63. When the high pressure pipe 62 is opened again from the valve 64, the lubricating oil remaining in the connection pipe 61 may immediately flow into the sealed chamber 46 and may be supplied to the first vane 43.

As described above, the present invention can control the restraint of the first vane 43 through the first vane control unit 60 so that compression or idling can be performed on the first compression chamber 31 side, thereby changing the compression capacity. have. That is, when the discharge pressure is applied to the sealed chamber 46 to advance and retreat the first vane 43, the compression operation is performed in both the first compression chamber 31 and the second compression chamber 32, so that Compression is done. On the other hand, when the first vane 43 is restrained by applying the suction pressure to the sealed chamber 46, the idling is performed in the first compression chamber 31, and the compression operation is performed only in the second compression chamber 32. The dose will be reduced.

In the present embodiment, the rotary compressor including only the first vane control unit 60 is illustrated and described. However, the second vane is provided after the volumes of the first compression chamber 31 and the second compression chamber 32 are differently provided. A second vane control unit (not shown) for controlling the restraint of 53 may be further provided. Here, the operation principle of the second vane control unit is the same as the first vane control unit 60. Therefore, in a state where the volumes of the first compression chamber 31 and the second compression chamber 32 are different from each other, the first vane 43 or the second vane control unit 60 is controlled by the first vane control unit 60 and the second vane control unit. By selectively restraining the vane 53, it is possible to vary the variation of the compression capacity. That is, when the first compression chamber 31 is idling and the second compression chamber 32 is compression-rotated, when the first compression chamber 31 is compression-rotated and the second compression chamber 32 is idling, Both the first compression chamber 31 and the second compression chamber 32 can implement a case in which the compression rotation is made, it is possible to vary the variable of the compression capacity. In addition, by varying the rotational speed of the transmission element 10 together with the mechanical compression capacity variable it is possible to further diversify the variable range of the compression capacity.

As described above, by connecting the vane control unit and the sealed chamber, and including a connection pipe for storing the lubricating oil supplied to the sealed chamber, the lubricant is continuously supplied to the sealed chamber to prevent the wear of the vane to extend the life of the vane It is possible to improve the operational reliability of the vane.

As described above, according to the present invention, it is possible to provide a rotary compressor that can extend the life of the vanes by preventing the wear of the vanes by continuously supplying the lubricating oil to the sealed chamber. have.

Claims (8)

In a rotary compressor, A cylinder having a vane slot formed in the compression chamber and having a vane guide portion recessed outward from an inner wall surface of the compression chamber and a sealed chamber extending from the vane guide portion; A roller which eccentrically rotates in the compression chamber to compress the compressed medium; A vane receivably received in the vane slot and contacting the outer surface of the roller to define the compression chamber; A vane control unit which applies either the suction pressure of the compressed medium flowing into the compression chamber and the discharge pressure of the compressed medium compressed in the compression chamber to the closed chamber; A connection pipe connecting the vane control unit and the sealed room and storing lubricating oil supplied to the closed room; And an oil separator provided in one region of the connection pipe to separate the compressed medium and the lubricating oil. The method of claim 1, The vane control unit, A low pressure pipe branched from the suction pipe into which the compressed medium flows into the compression chamber; A high pressure pipe branched from a discharge pipe from which the compressed medium compressed in the compression chamber flows out of the compression chamber; And a valve for selectively communicating the low pressure pipe and the high pressure pipe with the connection pipe. The method of claim 2, And the valve is disposed above the sealed chamber. delete A cylinder having a first vane slot and a second vane slot recessed outward from an inner wall surface of the first compression chamber and the second compression chamber to form a first compression chamber and a second compression chamber that are mutually divided; In a rotary compressor, The first vane slot includes a first vane guide part recessed outward from an inner wall surface of the compression chamber and a sealed chamber extending from the first vane guide part; First and second rollers eccentrically rotating in the first and second compression chambers to compress the compressed medium; A first vane and a second vane, which are accommodated in the first vane slot and the second vane slot, and which contact the outer surfaces of the first roller and the second roller to partition the first compression chamber and the second compression chamber; and; A vane control unit which applies either the suction pressure of the compressed medium flowing into the first compression chamber and the discharge pressure of the compressed medium compressed in the first compression chamber to the closed chamber; A connection pipe connecting the vane control unit and the sealed room and storing lubricating oil supplied to the closed room; And an oil separator provided in one region of the connection pipe to separate the compressed medium and the lubricating oil. The method of claim 5, The vane control unit, A low pressure pipe branched from the suction pipe into which the compressed medium flows into the first compression chamber; A high pressure pipe branched from a discharge pipe from which the compressed medium compressed in the first compression chamber flows out of the first compression chamber; And a valve for selectively communicating the low pressure pipe and the high pressure pipe with the connection pipe. The method of claim 6, And the valve is disposed above the sealed chamber. delete

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