KR20070030540A - Variable capacity rotary compressor - Google Patents

Abstract

Disclosed is a variable displacement rotary compressor which can expand the variable range of the compression capacity than the conventional one and can exhibit the optimum efficiency in both the low capacity compression operation and the high capacity compression operation. The variable displacement rotary compressor is provided with a housing having a first compression chamber and a second compression chamber having different mutual volumes, first and second rollers respectively installed in the first and second compression chambers, and rotating the first and second rollers. The first and second vanes are slidably supported, and the first and second vanes are slidably supported, and the second compression chamber is partitioned while the second and second rollers are radially retracted. A third vane and a fourth vane slidably supported to each other, a first vane control device for restraining or restraining the second vane, a second vane control device for restraining or restraining the fourth vane, and a rotating shaft in a forward direction It rotates in the reverse direction and the bidirectional output includes the other drive motor.

Description

VARIABLE CAPACITY ROTARY COMPRESSOR}

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

FIG. 5 is a cross-sectional view taken along the line VV ′ of FIG. 4.

6 is a cross-sectional view taken along line VI-VI 'of FIG. 4.

Explanation of symbols on the main parts of the drawings

10: sealed container, 20: drive motor,

21: rotating shaft, 30: compression mechanism,

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

42: first roller, 43: first vane,

44: second vane, 45: first vanes spring,

52: second roller, 53: third vane,

54: fourth vane, 55: second vanes spring,

70: first vane control device, 80: second vane control device.

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 for 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 only one compression chamber, and has a limitation in varying the compression capacity in a wider range because the compression capacity is varied by adjusting the compression operation or the idle operation under the control of the restraining means.

The present invention has been made to solve these problems, and an object of the present invention is to provide a variable displacement rotary compressor that can expand the variable range of the compression capacity than conventional and to vary the compression capacity.

Another object of the present invention is to provide a variable displacement rotary compressor capable of exhibiting optimum efficiency in both low and high capacity compression operations.

The variable capacity rotary compressor according to the present invention for achieving the above object comprises a housing having a first compression chamber and a second compression chamber having different mutual volumes, first and second rollers respectively installed in the first and second compression chambers; A first shaft and a second vane, the first and second vanes being slidably supported and partitioning the first compression chamber while advancing in the radial direction of the first roller; A third vane and a fourth vane partitioning the second compression chamber while sliding in a radial direction of the roller and slidably supported therebetween, a first vane control device for restraining or releasing the second vane, and the fourth vane; And a second vane control device for restraining or releasing the vanes and a driving motor for rotating the rotating shaft in a forward direction and a reverse direction.

In addition, the drive motor includes a stator with a coil wound and a rotor rotating in the stator. The coil of the stator has a number of turns of the main coil and the subcoil so that the output varies according to a change in the rotational direction of the rotor. It is characterized by being different.

According to the present invention, the first vane control device and the second vane control device are operated in opposition so as to selectively compress one of the first compression chamber and the second compression chamber according to the change in the rotational direction of the rotary shaft. Characterized in that.

The present invention also provides that the second vane control device restrains the fourth vane when compression is performed in the first compression chamber, and the first vane control device is configured to compress the second vane when compression is performed in the second compression chamber. It characterized in that the restraint.

The first vane control device may include a first cylinder installed on the second vane side, a first piston connected to the second vane and installed in the first cylinder, the first vane connected to the inside of the first cylinder; A flow path, a second flow path connecting the discharge side of the compressor and the first flow path, a third flow path connecting the suction side of the compressor and the first flow path, and the first, second, and third flow paths mutually It characterized in that it comprises a first flow path variable valve installed at the connection point.

In addition, the second vane control device may include a second cylinder installed on the fourth vane side, a second piston installed in the second cylinder and connected to the fourth vane, and a fourth communicating with the inside of the second cylinder. A flow path, a fifth flow path connecting the discharge side of the compressor and the fourth flow path, a sixth flow path connecting the suction side of the compressor and the fourth flow path, and the fourth, fifth, and sixth flow paths to each other; It characterized in that it comprises a second flow path variable valve installed at the connection point.

In addition, the present invention is characterized in that the width of the second and fourth vanes is smaller than the width of the first and third vanes.

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

The variable displacement rotary compressor according to the present invention, as shown in Figure 1, the drive motor 20 installed on the inner upper portion of the sealed container 10, the lower side of the inner container of the sealed container 10 and the drive motor 20 and It is provided with a compression mechanism (30) connected through the rotary shaft (21).

The drive motor 20 drives the compression mechanism 30 by rotating the rotary shaft 21. The drive motor 20 is a cylindrical stator 22 fixed to the inner surface of the hermetic container 10 and a rotor 23 rotatably installed in the stator 22 and having a central portion coupled to the rotating shaft 21. It includes. The drive motor 20 may be made of a BLDC motor capable of varying the rotational speed through electrical control and the forward and reverse rotation.

In addition, the stator 22 of the driving motor 20 includes an iron core 22a and a coil 22b wound around the iron core 22a, and the coil 22b is not specifically illustrated in the drawings, but the main coil and the subcoil are not shown. It includes. In addition, the drive motor 20 is made of a different number of windings of the main coil and the sub coil so that the output is changed according to the change in the rotation direction of the rotor (23). That is, the drive motor 20 is configured to have a larger number of turns of the main coil than the number of turns of the subcoil so as to exert a greater output when rotating in the reverse direction than when rotating in the forward direction. This is related to the operation of the compression mechanism 30, which will be described later, so that the drive motor 20 can exert a larger output when performing a high capacity compression while rotating in the reverse direction.

As shown in FIGS. 1 to 3, the compression mechanism 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 provided in the two compression chambers 31 and 32, respectively.

The housing has a first body 33 formed with the first compression chamber 31 formed therein, a second compression chamber 32 having a larger content than the first compression chamber formed therein, and a second installed under the first body 33. Intermediate plate 35 and first compression chamber interposed between the first and second bodies 33 and 34 to partition the body 34, the first compression chamber 31 and the second compression chamber 32. 31, which is mounted on the upper part of the first body 33 and the lower part of the second body 34 so as to close the upper opening of the 31 and the lower opening of the second compression chamber 32 and support the rotating shaft 21. And first and second 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 compression device 40 and the second compression device 50 may include first and second eccentric parts 41 and 51 provided on the outer surfaces of the rotary shafts 21 of the compression chambers 31 and 32, and each compression chamber ( 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 31 and 32. 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 partitions the first compression chamber 31 while advancing in the radial direction of the first compression chamber 31 in accordance with the rotation of the first roller 42, and supports the mutually slidable surfaces. The first vane 43 and the second vane 44, and the first vane spring 45 for pressing the first vane 43 toward the first roller 42. That is, the first compression chamber 31 is divided by the first vane 43 having a relatively large width and the second vane 44 having a relatively small width.

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 according to the rotation of the second roller 52 so that the surfaces in contact with each other are slidable. The third vane 53 and the fourth vane 54 are supported, and the second vane spring 55 presses the third vane 53 toward the second roller 52. That is, the second compression chamber 32 is partitioned by the third vane 53 of the relatively wide lower portion and the fourth vane 54 of the upper portion relatively small in width.

The present invention also includes a first vane control device 70 for restraining or releasing the second vane 44 and a second vane control device 80 for restraining or releasing the fourth vane 54. When the second vane 44 is constrained by the first vane control device 70, the first compression chamber 31 is idling and the second vane control device 80 causes the fourth vane 54 to idle. When restrained is to allow the second compression chamber 32 side to idle. The specific configurations of the first and second vane control devices 70 and 80 will be described later.

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.

2 and 3, the first suction port 61 and the first discharge port 63 position of the first compression chamber 31 side and the second compression chamber 32 side of the present invention are shown in FIG. The positions of the suction port 62 and the second discharge port 64 are arranged to be opposite to each other. The compression operation is performed only on the first compression chamber 31 side when the drive motor 20 rotates in the forward direction, and the compression operation is performed only on the second compression chamber 32 side when the drive motor 20 rotates in the reverse direction. It was made possible.

As shown in FIGS. 1 and 2, the first vane control device 70 moves forward and backward in the advancing direction of the first cylinder 71 and the second vane 44 provided at the rear end of the second vane 44. It is provided in the first cylinder 71 and has a first piston 72 connected to the rear end of the second vane 44. In addition, the first vane control device 70 includes a first pressure control pipe 73a connected to the rear end of the first cylinder 71 so as to form a first flow path 73 in communication with the inside of the second cylinder 71; 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 discharge side of the compressor with the first flow path 73; The third pressure control pipe branched from the refrigerant suction pipe 14 and connected to the first pressure control pipe 73a to form a third flow path 75 for communicating the suction side of the compressor with the first flow path 73 ( 75a) and a first flow path variable valve 76 provided at a point where the first, second, and third pressure regulating pipes 73a, 74a, 75a are connected to each other. The first flow path variable valve 76 is composed of a conventional three-way valve operated by an electric control signal.

As shown in FIGS. 1 and 2, the second vane control device 80 moves forward and backward in the advancing direction of the second cylinder 81 and the fourth vane 54 provided at the rear end of the fourth vane 54. A second piston 82 is installed in the second cylinder 81 and connected to the rear end of the fourth vane 54. In addition, the second vane control device 80 includes a fourth pressure regulating pipe (83a) connected to the rear end of the second cylinder (81) so as to form a fourth flow path (83) communicating with the inside of the second cylinder (81), A fifth pressure control pipe 84a branched from the discharge pipe 12 and connected to the fourth pressure control pipe 83a to form a fifth flow path 84 for communicating the discharge side of the compressor with the fourth flow path 83; The sixth pressure control pipe branched from the refrigerant suction pipe 14 and connected to the fourth pressure control pipe 83a to form a sixth flow path 85 for communicating the suction side of the compressor with the fourth flow path 83 ( 85a) and a second flow path variable valve 86 provided at a point where the fourth, fifth, and sixth pressure regulating pipes 83a, 84a, 85a are connected. The second flow path variable valve 86 is also made 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 FIGS. 1 to 3, when the rotating shaft 21 rotates in the direction of arrow A (forward direction) by the operation of the drive motor 20, a compression operation is performed on the first compression chamber 31 side, and the second operation is performed. The compression chamber 32 side is idle. In this case, the first vane control device 70 operates the first flow path variable valve 76 so that the second flow path 74 communicates with the first flow path 73, and the second vane control device 80 operates the sixth flow path. The second flow path variable valve 86 is operated so that the 85 communicates with the fourth flow path 83.

Therefore, at this time, since the pressure on the discharge side acts in the first cylinder 71 of the first vane control device 70, the first piston 72 presses the second vane 44, so that the second vane 44 With the rotation of the one roller 42, it advances and retreats in the state which contacted the outer surface of the 1st roller 42. FIG. In addition, since the first vane 43 is pressurized by the first vane spring 45, the first vane 43 advances and retreats together with the second vane 44. That is, since the first compression chamber 31 is partitioned by the first and second vanes 43 and 44 moving forward and backward together, a compression operation is performed.

On the other hand, since the second vane control device 80 has a pressure on the suction side in the second cylinder 81, the second piston 82 retreats, and thus the fourth vane 54 is moved from the outer surface of the second roller 52. Spaced apart. That is, the fourth vane 54 is restrained from being spaced apart from the second roller 52. Therefore, as shown in FIG. 3, only the third vane 53 pressed by the second vane spring 55 retracts from the second compression chamber 32, so that idling is performed.

As described above, when the compression operation is performed in the first compression chamber 31 and idling in the second compression chamber 32, the content of the first compression chamber 31 is smaller than that of the second compression chamber 32. Compression capacity is reduced. In addition, the compression operation and idling of the first compression chamber 31 are controlled by controlling the advancing and retraction of the second vane 44 through the first vane control device 70 while the compression operation is performed only in the first compression chamber 31. Repeated compression and idling) can further reduce the compression capacity. That is, the compression capacity of the low capacity band can be adjusted in various ways.

As shown in FIGS. 4 to 6, when the rotating shaft 21 rotates in the arrow B direction (reverse direction) by the operation of the drive motor 20, a compression operation is performed on the second compression chamber 32 side, and the first operation is performed. The compression chamber 31 side is idle. In this case, the first vane control device 70 operates the first flow path variable valve 76 so that the third flow path 75 communicates with the first flow path 73, and the second vane control device 80 operates the fifth flow path. The second flow path variable valve 86 is operated so that the 84 communicates with the fourth flow path 83.

Therefore, at this time, since the pressure of the suction side acts on the first cylinder 71 of the first vane control device 70 and the first piston 72 retreats, the second vane 44 is moved from the outer surface of the first roller 42. Spaced apart. That is, the second vane 44 is restrained from being spaced apart from the first roller 42. Therefore, since only the first vane 43 pressed by the first vane spring 45 is retracted from the first compression chamber 31, idling is performed.

On the other hand, in the second vane control device 80, the pressure on the discharge side acts in the second cylinder 81 so that the second piston 82 presses the fourth vane 54, so that the fourth vane 54 As the second roller 52 rotates, the roller is advanced in contact with the outer surface of the second roller 52. In addition, since the third vane 53 is pressed by the second vane spring 55, the third vane 53 advances and retreats together with the fourth vane 54. That is, since the second compression chamber 32 is partitioned by the third and fourth vanes 53 and 54 advancing together, the compression operation is performed.

As described above, when the idling is performed in the first compression chamber 31 and the compression operation is performed in the second compression chamber 32, the content of the second compression chamber 32 is larger than that of the first compression chamber 31. Compression capacity is large. In addition, the compression operation and idling of the second compression chamber 32 are controlled by controlling the advance and retreat of the fourth vane 54 through the second vane control device 80 while the compression operation is performed only in the second compression chamber 32. In case of repeated compression and idling, the compression capacity can be reduced. Therefore, the compression capacity of the high capacity band can also be variously adjusted.

In addition, the driving motor 20 of the compressor according to the present invention has a small output when the compression operation is performed in the first compression chamber 31 by rotating in the forward direction, and the compression operation is performed in the second compression chamber 32 by rotating in the reverse direction. The high output power ensures optimum efficiency in both low and high capacity compression operations. That is, the drive motor 20 rotates in the forward direction to reduce the output to be suitable for low capacity compression when performing the compression of the first compression chamber 31 (low capacity), and rotates in the reverse direction to the second compression chamber 32, high. Since the output is enlarged to be suitable for high capacity compression, the unnecessary energy consumption can be minimized and the optimum efficiency is always displayed in all compression areas.

As described in detail above, the variable displacement rotary compressor according to the present invention can not only vary the compression capacity by selectively performing the compression operation in any one of the first compression chamber and the second compression chamber having different mutual contents, Since the variable range of the compression capacity can be finely controlled through the control of the vane control device on which the operation is performed, the compression capacity can be adjusted in a wide band.

The present invention also provides a small output suitable for low capacity compression when the drive motor rotates in the forward direction to perform compression of the first compression chamber (low capacity), and rotates in the reverse direction so that the second motor (high capacity) When performing compression, high output is produced to be suitable for high-capacity compression. Therefore, there is an effect of achieving optimum efficiency in both low-capacity compression operation and high-capacity compression operation.

Claims (7)

A housing having a first compression chamber and a second compression chamber having different mutual volumes, first and second rollers respectively provided in the first and second compression chambers, a rotating shaft for rotating the first and second rollers, and Partitioning the first compression chamber while advancing in the radial direction of the first roller, and first and second vanes slidably supported therebetween, and partitioning the second compression chamber while advancing in the radial direction of the second roller; A third vane and a fourth vane slidably supported to each other, a first vane control device for restraining or restraining the second vane, a second vane control device for restraining or restraining the fourth vane, and A variable displacement rotary compressor comprising a drive motor for rotating the rotary shaft in the forward and reverse directions. The method of claim 1, The drive motor includes a stator with a coil wound and a rotor that rotates in the stator, and the coil of the stator has a different number of windings of the main coil and the subcoil so that an output varies according to a change in the rotational direction of the rotor. Capacity variable rotary compressor characterized in that. The method of claim 1, The first vane control device and the second vane control device operate in opposition so as to selectively compress one of the first compression chamber and the second compression chamber according to a change in the rotational direction of the rotary shaft. Capacity variable rotary compressors. The method of claim 3, The second vane control device restrains the fourth vane when compression is performed in the first compression chamber, and the first vane control device restrains the second vane when compression is performed in the second compression chamber. A capacity variable rotary compressor. The method of claim 1, The first vane control device includes a first cylinder installed on the second vane side, a first piston connected to the second vane and connected to the second vane, and a first flow path communicating with the inside of the first cylinder. And a second passage connecting the discharge side of the compressor and the first passage, a third passage connecting the suction side of the compressor and the first passage, and the first, second and third passages are interconnected. A variable displacement rotary compressor comprising a first flow path variable valve installed at a point. The method of claim 1, The second vane control device includes a second cylinder installed on the fourth vane side, a second piston installed in the second cylinder to be retractable and connected to the fourth vane, and a fourth flow path communicating with the inside of the second cylinder. And a fifth flow passage connecting the discharge side of the compressor and the fourth flow passage, a sixth flow passage connecting the suction side of the compressor and the fourth flow passage, and the fourth, fifth and sixth flow passages to each other. A variable displacement rotary compressor comprising a second flow path variable valve installed at the connection point. The method of claim 1, A variable displacement rotary compressor characterized in that the width of the second and fourth vanes is smaller than the width of the first and third vanes.

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