JP2000274385A - Gas compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas compressor capable of surely preventing pressure fluctuation caused by a reverse flow from a compression chamber from being propagated without enlarging the whole of the gas comprresor. SOLUTION: In this gas compressore provided with a gas compression part 10 compressing gas by means of a rotor 17 rotatably provided in a cylinder chamber 16 whose inner circumference is in an ellipse shape, a gas feeding part 60 sucking gas from the outside for feeding it to the gas compression part 10, and with a control plate 30 controlling the volume of gas to be sucked in to the gas compression part 10, the gas feeding part 60 is formed out of the casing 11 of the gas compressor, and of a partitioning plate 19 partitioning the casing 11 in the vertical direction with respect to a rotor shaft 17a, and is provided with a large sized chamber 62 including an inner diametral cross section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas compressor, and more particularly, to a gas compressor for preventing propagation of pressure fluctuation due to backflow from a compression chamber.

[0002]

2. Description of the Related Art FIG. 4 is a sectional view of a variable displacement gas compressor conventionally used in car air conditioners and the like. The gas compressor includes a gas compression unit 10, a gas transfer chamber 20, a control plate 30, a gas discharge unit 40
And

[0003] The gas compressor 10 includes a front head 14,
An inner periphery formed by the rear side block 15 and the cylinder block 13 is provided with a rotor 17 rotatably in a cylinder chamber 16 having an elliptical cylindrical shape, and a plurality of vanes (not shown) are mounted on the rotor 17 so as to be able to advance and retreat. Compression chamber 12
Is formed, and the refrigerant gas is compressed by a change in capacity due to the rotational movement of the rotor 17. The casing 11 has a rear side block 15 and a cylinder block 1
3 is mounted, and a front head 14 is mounted at an end of the casing 11.

The gas transfer chamber 20 is disposed on one side of the gas compression section 10 with a predetermined capacity, and exchanges refrigerant gas with the gas compression section 10.

[0005] The control plate 30 is disposed between the gas transfer chamber 20 and the gas compressing section 10 and has an opening (not shown) for communicating the gas compressing section 10 with the gas transfer chamber 20. The compression capacity of the gas compression unit 10 is controlled by adjusting the effective area of the unit. The adjustment of the effective area of the opening can be performed by rotating the control plate 30.

The gas discharge unit 40 is disposed on the other side of the gas compression unit 10 and discharges the solvent gas compressed by the gas compression unit 10 from the discharge chamber 42.

The gas supply section 50 has an intake port 51 for taking in gas, which is arranged on the other side of the gas compression section 10, and supplies gas to the gas compression section 10. As shown by the arrow (a), the solvent gas passes through the passages 52, 53 a, 53 b, 54, 55, and the gas transfer chamber 20, which constitute the gas supply unit 50, and passes through the opening of the control plate 30. It is supplied to the compression chamber 12 through the section.

The compressed refrigerant gas supplied to the compression chamber 12 is discharged from the compression chamber 12 to the outside through the gas discharge part 40 as shown by an arrow (b).

When the effective area of the opening of the control plate 30 is increased by rotating the control plate 30 in order to reduce the compression capacity, a part of the refrigerant gas once sucked into the compression chamber 12 is As shown by the arrow (c) with the rotational movement, the control plate 30
The gas flows back into the gas transfer chamber 20 through the opening. Then, compression starts when the vane 18 passes through the end of the opening of the control plate 30.

FIG. 5 is a cross-sectional view of the conventional variable displacement gas compressor shown in FIG. An intake port 51 is provided at an upper portion of the casing 11, and passages 53 a and 53 b are provided at a central portion of the casing 11.
The passage 53a communicates with the passage 53a, and the refrigerant gas is sucked through the intake port 51 and the passages 52, 53a, 53b. A discharge chamber 42 is provided outside the passages 53a and 53b, and an oil reservoir 43 for lubricating oil is provided below the discharge chamber 42.

[0011]

However, the conventional variable displacement gas compressor has the following problems.

As described above, in the conventional variable displacement gas compressor, the gas compression capacity of the gas compression section 10 is adjusted by rotating the control plate 30.

When the compression capacity is small, the control plate 3
In order to increase the effective area of the opening of the control plate 30 by the rotation of 0, the refrigerant gas in the compression chamber 12 flows back to the gas transfer chamber 20 again through the opening of the control plate 30,
Pressure fluctuation occurs in the gas transfer chamber 20. The pressure fluctuation due to the backflow may be transmitted to an external pipe or evaporator to generate noise.

The pressure fluctuation due to the backflow from the compression chamber 12 is as follows:
The gas supply unit 50 has a certain distance and is somewhat relaxed, and the gas supply unit 50 also functions as a muffler. Therefore, it is prevented to some extent that the pressure fluctuation due to the backflow is transmitted to the external piping and the evaporator to generate noise.

However, such noise prevention means alone may not provide a sufficient noise prevention effect depending on the shapes and mounting conditions of external piping and evaporators.

An effective method of reducing the propagation of pressure fluctuations is that the length of the gas supply section 50 as a propagation path is long,
Although a large change in the cross-sectional area is required, the change in the cross-sectional area of the gas supply unit 50 is not large. In order to increase the change in the cross-sectional area, it is conceivable to provide a room outside or inside the gas compressor and communicate with the gas supply unit 50. However, according to this, the size of the entire device increases. There is.

The present invention has been made in view of the above, and an object of the present invention is to provide a gas compressor which reliably prevents propagation of pressure fluctuation due to backflow from a compression chamber without increasing the overall size. Aim.

[0018]

Accordingly, a gas compressor according to the present invention comprises: a gas compressor for compressing gas by rotation of a rotor rotatably provided in a cylinder chamber having an inner circumference of an elliptical cylinder;
A variable-capacity gas compression system comprising: a gas supply unit that takes in gas from the outside and supplies gas to the gas compression unit; and a control plate that controls the volume of gas sucked into the gas compression unit from the gas supply unit. In the machine, the gas supply unit,
A large-sized chamber formed by a casing of the gas compressor and a partition plate for partitioning the casing in a direction perpendicular to the rotor shaft and having an inner diameter cross section of the casing is provided.

Further, the gas supply section includes the large chamber and a small chamber having a discharge chamber of the gas compressed by the gas compression section on an outer peripheral surface.

Further, the gas supply unit includes a communication pipe communicating the large chamber and the small chamber and having an opening for lubricating oil accumulated in the large chamber, and gas is sucked through the communication pipe. Lubricating oil that accumulates in the large chamber when flowing is sucked into the communication pipe.

Further, the gas supply section supplies the suction gas to the gas compression section via a gas transfer chamber having a predetermined capacity.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a gas compressor according to the present invention will be described below in detail with reference to FIGS.

In FIGS. 1 to 3, the same members as those of the conventional members shown in FIGS. 4 and 5 are denoted by the same reference numerals.

As shown in the sectional view of FIG. 1, the gas compressor has a gas compression unit 10, a gas supply unit 60, and a control plate 30. The gas compression unit 10 is provided with a rotor 17 rotatably provided in a cylinder chamber 16 having an elliptical cylindrical inner periphery formed by a front head 14, a rear side block 15, and a cylinder block 13. FIG. As shown in FIG. 1 (A-A cross-sectional view), vanes 18 are respectively mounted on a plurality of vane grooves 18a so as to be able to advance and retreat, and a cylinder chamber 16 is partitioned by the vanes 18 into a plurality of compression chambers 12, and these compression chambers 12 , Suction port 51
The refrigerant gas is further sucked in, and the magnitude of the capacity is repeatedly changed by the rotation of the rotor 17, and the low-pressure refrigerant gas is compressed by the change in the capacity. The compressed high-pressure refrigerant gas is discharged to the discharge chamber 72.

The control plate 30 includes the front head 14
The control plate 30 is provided rotatably between the compression block 12 and the cylinder block 13. As shown in FIG. have. When such a control plate is rotated, the position of the notch 30a changes, the compression start angle changes, and the compression capacity changes.

The gas supply section 60 is composed of passages 54 and 55, a small chamber 61, and a large chamber 62. A communication pipe 63 is inserted between the small chamber 61 and the large chamber 62. Cylinder block 1
A passage 55 is formed in the direction 3 in the direction of the rotor shaft 17 a, one end of the passage 55 is connected to the gas transfer chamber 20, and the other end of the passage 55 is connected to the passage 54. Further, the passage 54
Is connected in series via a communication pipe 63 to a small chamber 61 and a large chamber 62 that reduce the propagation of pressure fluctuations from the compression chamber 12, and passes through the small chamber 61, the communication pipe 63, and the large chamber 62. And is connected to the intake port 51. Therefore, the refrigerant gas sucked into the suction port 51 passes through the gas supply unit 60 and passes through the gas transfer chamber 20.
Is sucked into the compression chamber 12 through the notch of the control plate 30.

FIG. 3 is a sectional view taken along line BB of FIG. The large chamber 62 is formed by the casing 11 and the partition plate 19, and has a large section 6 whose outer periphery is the inner diameter of the casing 11.
2a, the communication tube 63 has a small cross section 63a, the small chamber 61 has a middle cross section 61a, and the passage 54 has a small cross section 54a. Therefore, the pressure fluctuation from the compression chamber 12 is changed from the passage 54 having the small cross section 54 a to the middle cross section 6.
The light is transmitted to a large chamber 62 having a large section 62a through a small chamber 61 having a section 1a and a communication pipe 63 having a small section 63a.

A discharge chamber 7 is provided around the small chamber 61.
2 (see FIG. 1), and a lubricating oil reservoir 73 is provided below the discharge chamber 72. The lubricating oil in the oil sump 73 circulates through various parts of the gas compressor by the discharge pressure of the refrigerant gas discharged into the discharge chamber 72.

The communication pipe 63 has a vertically cylindrical suction pipe section 64 having an opening 64a at the lower end, and when the refrigerant gas is sucked and flows through the suction pipe section 64, the large chamber 6 is formed.
2 is sucked into the small chamber 61 through the suction pipe section 64, and is sucked into the oil pool 7 through the compression section 10.
Returned to 3.

Next, the operation of the gas compressor configured as described above will be described with reference to FIGS.

When the compression capacity of the refrigerant gas in the compression chamber 12 is maximum, the control plate 30 is at the position shown in FIG. When the compression capacity is the maximum, the refrigerant gas is moved from the intake port 51 to the large chamber 62, the communication pipe 63, the small chamber 61, and the passage as shown by an arrow (a) in FIG. 54,
The gas passes through 55 and is sucked into the compression chamber 12 through the gas transfer chamber 20 and the notch 30 a which is the opening of the control plate 30. The sucked refrigerant gas is compressed by the movement of the vane 18 without flowing back to the gas transfer chamber 20. This compressed refrigerant gas is, as shown by the arrow (b) in FIG.
The liquid is discharged to the discharge chamber 72.

When the compression capacity is minimum, the control plate 30 is at the position shown in FIG. 2A, and the opening area of the suction side of the compression chamber 12 becomes maximum. Therefore, the refrigerant gas sucked into the compression chamber 12 by the movement of the vane 18 is the vane 1
Until the compression by 8 starts, as shown by the arrow (c) in FIG. 1, a large amount of backflow flows through the notch 30a, and then the compression is performed.

For this reason, the gas exchange chamber 20
The pressure fluctuation inside becomes large, and this pressure fluctuation tends to be transmitted to the outside. The gas transfer chamber 20 communicates with the intake port 51 and has a considerable distance to the outside.
From the passage 54 having the small cross section 54a to the middle cross section 61a
Through a small chamber 61 having a small cross section and a communication pipe 63 having a small cross section 63a, and further through a large chamber 62 having a large cross section 62a to the intake port 51, so that pressure fluctuation from the compression chamber 12 is reduced. The effect is high, and propagation to the outside can be reliably prevented. Therefore, it is possible to effectively prevent the pressure fluctuation from the compression chamber 12 from being transmitted to the external piping and the evaporator and generating noise.

In order to increase the change in the cross-sectional area of the gas supply unit 60, it is conceivable to further narrow the partial cross-sectional area of the narrow gas supply unit 60. In this case, when the maximum cooling capacity is required, , The pressure loss of the gas supply unit 60 increases,
It is not desirable because the refrigerant gas becomes difficult to flow and cooling cannot be sufficiently performed.

As described above, in the above embodiment, the body diameter of the gas compressor is limited by the space in which the gas compressor is installed. Even if the gas compressor is constrained in space, it can make full use of the constrained gas compressor body diameter and sufficiently reduce the pressure fluctuation transmitted to the outside without increasing the size of the gas compressor. Also, it is possible to prevent noise from being transmitted to the external piping and the evaporator even in various shapes and mounting conditions of the external piping and the evaporator.

A part of the lubricating oil used for lubrication of the compression chamber 12 circulates in the gas compressor together with the refrigerant gas.
Lubricating oil tends to accumulate in places where the flow of refrigerant gas stagnates, and may accumulate in the large chamber 62. A communication pipe 6 for communicating the large chamber 62 and the small chamber 61
The hole 3 is opened at the center of the compression chamber 12, but even if the lubricating oil accumulates in the lower part of the large chamber 62 lower than the hole position, the communication pipe 63 is still in the vertical cylindrical intake pipe section 6.
4, when the refrigerant gas is sucked and flows through the suction pipe portion 64, the lubricating oil accumulated in the lower portion of the large chamber 62 is sucked into the small chamber 61 through the suction pipe portion 64 and compressed from the small chamber 61. It can be returned to the oil sump 73 via the part 10.

The passages 54 and 55 are provided on the opposite side of the rotor shaft 17a as shown by the dotted line in FIG. 1 so as to communicate with the lower cutout 30a shown in FIG. 2A. . The lubricating oil accumulated in the lower part of the small chamber 61 is
From these passages 54 and 55, the oil sump 7
3 can be returned.

The gas compressor of the above embodiment has been described with respect to an example in which a refrigerant gas is used. However, the present invention is not limited to this. it can.

[0039]

According to the present invention, there is provided a gas compressor which compresses gas by rotation of a rotor rotatably provided in a cylinder chamber having an inner periphery in an elliptical cylindrical shape, and a gas compressor which inhales gas from the outside and compresses the gas. In a variable capacity gas compressor including a gas supply unit that supplies gas to a compression unit, and a control plate that controls the volume of gas sucked into the gas compression unit from the gas supply unit, the gas supply unit Is formed by a casing of a gas compressor and a partition plate that partitions the casing in a direction perpendicular to a rotor shaft, and has a large chamber having an inner diameter cross section of the casing, thereby increasing the size of the gas compressor. The pressure fluctuation transmitted to the outside can be reduced sufficiently, and noise is generated by transmitting to the external piping and the evaporator even for various shapes and mounting conditions of the external piping and evaporator. It can be a Rukoto of prevention.

The gas supply unit includes the large chamber and a small chamber having a discharge chamber for the gas compressed by the gas compression unit on the outer peripheral surface.
Pressure fluctuations transmitted to the outside can be reduced more effectively.

Further, the gas supply unit includes a communication pipe which communicates the large chamber with the small chamber and has an opening for lubricating oil accumulated in the large chamber, and gas is sucked through the communication pipe. Since the lubricating oil that accumulates in the large chamber when flowing is sucked into the communication pipe, the gas supply unit can be circulated without stopping the lubricating oil, and pressure fluctuation can be sufficiently reduced.

Further, since the gas supply section supplies the suction gas to the gas compression section through the gas transfer chamber having a predetermined capacity, the effect of reducing pressure fluctuation can be added.

[Brief description of the drawings]

FIG. 1 is a sectional view of a gas compression section according to the present invention.

FIG. 2 is a sectional view of the gas compressor according to the present invention shown in FIG.
Sectional view.

FIG. 3 is a BB diagram of the gas compression section according to the present invention shown in FIG. 1;
Sectional view.

FIG. 4 is a cross-sectional view of a variable displacement gas compressor conventionally used in car air conditioners and the like.

FIG. 5 is a diagram showing a conventional variable displacement gas compressor shown in FIG.
-C sectional drawing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Gas compression part 11 Casing 12 Compression chamber 13 Cylinder block 14 Front head 15 Rear side block 16 Cylinder chamber 17 Rotor 18 Vane 20 Gas transfer chamber 30 Control plate 30a Notch part 40 Gas discharge part 42, 72 Discharge chamber 43, 73 Oil reservoir Reference Signs List 50 gas supply section 51 intake port 52, 53a, 53b, 54, 55 passage 60 gas supply section 61 small chamber 62 large chamber 63 communication pipe 64 intake pipe section 64a opening section

Claims (4)

[Claims] 1. A gas compressor for compressing a gas by rotation of a rotor rotatably provided in a cylinder chamber having an inner periphery of an elliptical cylinder, and a gas for sucking gas from the outside and supplying the gas to the gas compressor. In a variable capacity gas compressor including a supply unit and a control plate that controls a volume of gas sucked into the gas compression unit from the gas supply unit, the gas supply unit includes a casing of the gas compressor and the gas compressor. A gas compressor comprising a large chamber formed by a partition plate for partitioning a casing in a direction perpendicular to a rotor shaft and having an inner diameter cross section of the casing. 2. The gas compressor according to claim 1, wherein the gas supply unit includes the large chamber and a small chamber having a discharge chamber of a gas compressed by the gas compression unit on an outer peripheral surface. . 3. The gas supply section includes a communication pipe communicating the large chamber and the small chamber and having an opening for lubricating oil accumulated in the large chamber, wherein gas is sucked through the communication pipe. The gas compressor according to claim 2, wherein the lubricating oil that accumulates in the large chamber when flowing is sucked into the communication pipe. 4. The gas according to claim 1, wherein the gas supply unit supplies the suction gas to the gas compression unit via a gas transfer chamber having a predetermined capacity. Compressor.