JP2001304144A - Horizontal scroll compressor - Google Patents

Abstract

(57) [Problem] To provide a horizontal scroll compressor which can be changed to an internal high pressure type and an internal low pressure type, improves sealing performance of a back pressure chamber, prevents a decrease in volumetric efficiency, and improves performance. SOLUTION: An electric motor 6 and a compression unit 7 are arranged on the left and right in a closed container 1a, and the compression unit 7 is engaged with a fixed scroll 2 and an orbiting scroll 3 to form a compression chamber 7b. The orbiting scroll 3 is held between the fixed scroll 2 and the closed casing 1a is partitioned into a motor chamber 6a and a discharge chamber 8, and a discharge pipe 12 is provided in the discharge chamber 8, and a suction pipe is provided in the compression section 7. 11 as well as the motor room
The first inlet / outlet pipe and the second inlet / outlet pipe are respectively connected to 6a, and the pressure in the central back pressure chamber 18 provided between the annular small seal 16 and the large seal 17 that divides the back surface of the orbiting scroll 3 into three is set to an intermediate pressure. In the horizontal scroll compressor 1, the communication passage 19 for communicating the discharge chamber 8 and the central back pressure chamber 18 is formed by the compression section 7.
And a throttle device 20 is inserted into the communication passage 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal scroll compressor, and more particularly, to a seal for a back pressure chamber in which the type of a compressor can be changed to an internal high-pressure type or an internal low-pressure type in accordance with an operating condition. About sex.

[0002]

2. Description of the Related Art FIG. 4 is a cross-sectional view of a conventional horizontal scroll compressor, and FIG. 5 is a cross-sectional view of a main part of a conventional horizontal scroll compressor.

[0003] A conventional horizontal scroll compressor 1 comprises a stationary scroll 2 having a motor 6 and a compression section 7 arranged on the left and right sides in a closed container 1a, and the compression section 7 having a spiral wrap on a head plate (not shown). Compression chamber that meshes with orbiting scroll 3
7b, the main frame 4 and the fixed scroll 2
The airtight discharge chamber 8 which holds the orbiting scroll 3 and discharges the compressed refrigerant from the discharge port 7a provided in the fixed scroll 2, and the airtight motor chamber 6a which accommodates the motor 6
Are separated by the compression unit 7 and the motor room
On one side of 6a, a shaft 9 driven by the electric motor 6 is provided.
And a sub-motor chamber 6b defined by a sub-bearing 10 having a refrigerant flow hole 10a.

A discharge pipe 12 is connected to the discharge chamber 8, a suction pipe 11 is connected to the compression section 7, and a first access pipe 14 and a second access pipe 13 are connected to the motor chamber 6a. ing. During the cooling operation, the low-pressure refrigerant is sucked from the suction pipe 11, and the high-pressure refrigerant compressed by the compression unit 7 is sequentially discharged from the first inlet / outlet pipe 14 through the discharge chamber 8 and the discharge pipe 12 to the electric motor chamber. The horizontal scroll compressor 1 is circulated to 6a and discharged from the second inlet / outlet pipe 13 to the refrigerant circuit to make the horizontal scroll compressor 1 an internal high pressure type.

During a heating operation, low-pressure refrigerant from the refrigerant circuit is sucked into the motor room 6a through the second inlet / outlet pipe 13, and
The compression section 7 is sequentially passed through the first inlet / outlet pipe 14 and the suction pipe 11.
The high-pressure refrigerant compressed in the horizontal scroll compressor 1 is discharged through the discharge chamber 8 and the discharge pipe 12 to the refrigerant circuit.
Is an internal low pressure type.

On the other hand, the pressure of the central back pressure chamber 18 provided between the annular small seal 16 and the large seal 17 provided on the back surface of the orbiting scroll 3 of the compression section 7 and dividing the back surface into three parts by concentric circles is intermediate. Pressure.

Thus, in both the internal low-pressure operation and the internal high-pressure operation, the orbiting scroll 3 of the compression section 7 is pressed against the fixed scroll 2 to reduce the axial gap between the fixed scroll 2 and the orbiting scroll 3 and to reduce the intermediate pressure. As a result, the power loss is reduced, and the performance of the horizontal scroll compressor 1 is improved.

However, in order to set the pressure in the central back pressure chamber 18 to the intermediate pressure, it is necessary to release the high pressure after compression to a low pressure on the suction side. There is a problem that the performance of the horizontal scroll compressor 1 may be reduced.

[0009]

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a horizontal scroll compressor in which the type of a compressor can be changed between an internal high pressure type and an internal low pressure type.
It is an object of the present invention to provide a horizontal scroll compressor with improved performance by improving the sealing performance of a back pressure chamber and preventing a decrease in volumetric efficiency.

[0010]

Means for Solving the Problems The present invention has been made to solve the above-mentioned problems. An electric motor and a compression section are disposed on the left and right sides in a closed container, and the compression section is provided with a spiral wrap on a head plate. The fixed scroll having the fixed scroll and the orbiting scroll are engaged with each other to form a compression chamber, the orbiting scroll is held between the main frame and the fixed scroll, and the inside of the sealed container is partitioned into an airtight motor chamber and a discharge chamber. A discharge pipe is connected to the discharge chamber, a suction pipe is connected to the compression unit, and a first inlet / outlet pipe and a second inlet / outlet pipe are connected to the electric motor chamber, respectively. And the high-pressure refrigerant compressed in the compression section flows from the first inlet / outlet pipe to the electric motor chamber via the discharge chamber and the discharge pipe sequentially, and is discharged from the second inlet / outlet pipe to the refrigerant circuit and compressed. Heating machine with internal high pressure type At the time of rotation, the low-pressure refrigerant from the refrigerant circuit is sucked into the electric motor chamber from the second inlet / outlet pipe, and sequentially passes through the first inlet / outlet pipe and the suction pipe, and the high-pressure refrigerant compressed in the compression unit is discharged into the discharge chamber and discharged. An annular small seal and a large seal are provided on the back of the orbiting scroll of the compression section, and the back is divided into three parts by concentric circles, while circulating through a pipe and discharging the refrigerant into the refrigerant circuit to make the compressor an internal low pressure type. In a horizontal scroll compressor in which the pressure in the central back pressure chamber provided between them is an intermediate pressure, a communication path communicating the discharge chamber and the central back pressure chamber is connected to the fixed scroll and the main frame. And a throttle device is inserted into the communication passage.

[0011] The communication path is formed below the compression section.

Alternatively, a discharge chamber side entrance of the communication passage is formed below the fixed scroll, the communication passage extends from the entrance to the upper side of the fixed scroll, and the communication passage is formed above the compression section. It is formed continuously on the main frame.

Alternatively, the communication passage is formed above the compression portion, and has a communication opening communicating with the communication passage above, a communication hole penetrating therethrough, and a discharge chamber side inlet below. A member is provided, and the high-pressure introducing member is fixedly abutted on the discharge chamber side of the fixed scroll.

The outlet of the communication passage is opened above the small seal, and the communication passage communicates with the groove bottom of the large seal.

Further, a plurality of the aperture devices are provided.

Alternatively, the expansion device is provided integrally with the high-pressure introduction member.

On the other hand, a filter is provided at the entrance of the communication passage on the discharge chamber side.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail based on embodiments with reference to the accompanying drawings. FIG.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a main part of a first embodiment of a horizontal scroll compressor according to the present invention. Here, 1 is a horizontal scroll compressor, 1a is a closed vessel, 2 is a fixed scroll, 2a is a discharge chamber side entrance, 3 is a revolving scroll, 4 is a main frame, 6
Is a motor, 6a is a motor room, 7 is a compression section, 7a is a discharge port, 8
Is a discharge chamber, 11 is a suction pipe, 12 is a discharge pipe, 15 is oil, 16 is a small seal, 17 is a large seal, 18 is a central back pressure chamber, 19 is a communication passage, 20
Denotes an aperture device, and 22 denotes a filter. Note that the basic structure of the horizontal scroll compressor 1 is the same as that of the conventional example, and a description thereof will be partially omitted.

The horizontal scroll compressor 1 includes a motor 6 and a compression unit 7 arranged on the left and right sides in a closed container 1a. The compression unit 7 includes a fixed scroll 2 having a spiral wrap on a head plate (not shown), and an orbiting scroll. 3 to form a compression chamber 7b, hold the orbiting scroll 3 between the main frame 4 and the fixed scroll 2, and divide the inside of the sealed container 1a into an airtight motor chamber 6a and a discharge chamber 8. A discharge pipe 12 is connected to the discharge chamber 8, and a suction pipe 11 is connected to the compression section 7.

At the same time, the pressure in the central back pressure chamber 18 provided between the annular small seal 16 and the large seal 17 provided on the back surface of the orbiting scroll 3 of the compression section 7 and dividing the back surface into three parts by concentric circles. Medium pressure. Here, a communication passage 19 communicating the discharge chamber 8 and the central back pressure chamber 18 is formed below the compression section 7 continuously with the fixed scroll 2 and the main frame 4, and the communication passage 19 is formed. An aperture device 20 is inserted in the apparatus. On the other hand, a filter 22 is disposed at the discharge chamber side entrance 2a of the communication passage 19.

Next, the operation and effect of this embodiment will be described. The communication path 19 is connected to the fixed scroll 2
And the main frame 4 is formed below the compression section 7 and a throttle device 20 is inserted into the communication passage 19, so that the pressure of the central back pressure chamber 18 is reduced by the throttle device 20. It is possible to reduce the minimum high-pressure introduction amount necessary to maintain the intermediate pressure.

Further, since the oil 15 is introduced into the central back pressure chamber 18, the sealing performance of the small seal 16 and the large seal 17 can be improved. Further, the filter 22 can prevent clogging of the expansion device 20 due to entry of foreign matter.

FIG. 2 is a sectional view showing a main part of a second embodiment of the horizontal scroll compressor according to the present invention. According to this embodiment, the discharge chamber side entrance 2a of the communication passage 19 is formed below the fixed scroll 2, and extends from the entrance 2a toward the upper side of the fixed scroll 2 to extend the communication passage 19. 19 and the main frame 4 above the compression section 7.
Formed continuously.

The outlet of the communication passage 19 is opened above the small seal 16, and the communication passage 19 communicates with the groove bottom 17 a of the large seal 17. Further, a plurality of the aperture devices 20 are provided. On the other hand, the communication passage 19
A filter 22 is disposed at the discharge chamber side entrance 2a of the filter.

Next, the operation and effect of this embodiment will be described. The communication passage 19 is formed continuously with the main frame 4 above the compression section 7, and an outlet of the communication passage 19 is opened above the small seal 16, and the communication passage 19 is If the squeezing device 20 is immersed in the oil 15 when the main body is stopped, the foreign matters floating in the oil settle and accumulate around the squeezing device 20 when the main body is stopped, and start operation. Sometimes, it is possible to prevent the block from clogging the expansion device 20.

Further, the oil from the outlet from the communication passage 19
15 reliably adheres to the small seal 16 and the large seal 17, and the sealing performance can be improved. By providing a plurality of the throttle devices 20, the diameter of each of the throttle holes can be increased, so that clogging due to foreign matter can be reduced. Further, the filter 22 can prevent clogging of the expansion device 20 due to entry of foreign matter.

FIG. 3 is a sectional view showing a main part of a third embodiment of the horizontal scroll compressor according to the present invention. According to this embodiment, the communication path 19 is formed above the compression section 7 and the communication port 21 communicating with the communication path 19 above.
c, a communication hole 21b penetrating therethrough, and a high pressure introduction member 21 having a discharge chamber side entrance 21a below.
21 is fixed to the fixed scroll 2 in contact with the discharge chamber 8 side.

Further, the expansion device 20 is provided integrally with the high-pressure introduction member 21. The high-pressure introducing member 21 is manufactured using a metal that can be easily processed, such as brass. On the other hand, a filter 22 is disposed at the discharge chamber side entrance 21a of the communication passage 19.

Next, the operation and effect of this embodiment will be described. First, since the oil 15 is introduced into the central back pressure chamber 18 by the high pressure introducing member 21, the sealing performance of the small seal 16 and the large seal 17 can be improved.

Since the high pressure introducing member 21 is made of a metal such as brass, which can be easily processed, the cost can be reduced as compared with the case where the communication passage 19 is formed in the fixed scroll 2 and the expansion device 20 is inserted. Can be achieved. The filter 22
Accordingly, it is possible to prevent the restriction device 20 from being clogged due to the entry of foreign matter.

[0031]

As described above, according to the present invention, an electric motor and a compression unit are disposed on the left and right sides in a closed container, and the compression unit is composed of a fixed scroll having a spiral wrap on a head plate and a revolving scroll. An interlocking compression chamber is formed, the orbiting scroll is held between the main frame and the fixed scroll, and the inside of the closed container is partitioned into an airtight motor chamber and a discharge chamber, and a discharge pipe is provided in the discharge chamber. A suction pipe is connected to the compression section, and a first access pipe and a second access pipe are connected to the motor chamber, respectively, and a low-pressure refrigerant is sucked from the suction pipe during a cooling operation. The compressed high-pressure refrigerant flows through the discharge chamber and the discharge pipe sequentially from the first inlet / outlet pipe to the electric motor chamber, and is discharged from the second inlet / outlet pipe to the refrigerant circuit to make the compressor an internal high-pressure type. During operation, low-pressure refrigerant from the refrigerant circuit The high-pressure refrigerant sucked into the electric motor chamber from the second inlet / outlet pipe and sequentially passed through the first inlet / outlet pipe and the suction pipe is discharged to the refrigerant circuit through the discharge chamber and the discharge pipe through the discharge chamber and the discharge pipe. And a central back pressure chamber provided between an annular small seal and a large seal, which is provided on the back surface of the orbiting scroll of the compression unit, and which divides the back surface into three parts by concentric circles. In a horizontal scroll compressor having an intermediate pressure, a communication passage communicating the discharge chamber and the central back pressure chamber is formed continuously with the fixed scroll and the main frame, and a throttling device is formed in the communication passage. Was inserted. For this reason,
It is possible to provide a horizontal scroll compressor in which the sealing performance of the back pressure chamber is improved, the volume efficiency is prevented from lowering, and the performance is improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing a first embodiment of a horizontal scroll compressor according to the present invention.

FIG. 2 is a sectional view showing a main part of a second embodiment of the horizontal scroll compressor according to the present invention.

FIG. 3 is a sectional view showing a main part of a third embodiment of the horizontal scroll compressor according to the present invention.

FIG. 4 is a sectional view of a conventional horizontal scroll compressor.

FIG. 5 is a sectional view of a main part of a conventional horizontal scroll compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Horizontal scroll compressor 1a Closed vessel 2 Fixed scroll 2a Discharge chamber side entrance 3 Orbiting scroll 4 Main frame 6 Electric motor 6a Electric motor room 6b Sub motor room 7 Compressor 7a Discharge port 7b Compression chamber 8 Discharge chamber 9 Shaft 11 Suction pipe 12 Discharge Pipe 15 Oil 16 Small seal 17 Large seal 17a Groove bottom 18 Central back pressure chamber 19 Communication passage 20 Throttle device 21 High pressure introduction member 21a Discharge chamber side inlet 21b Communication hole 21c Communication opening 22 Filter

Claims (8)

[Claims] An electric motor and a compression section are disposed on the left and right sides in a closed container, and the compression section is formed by engaging a fixed scroll having a spiral wrap on a head plate with an orbiting scroll to form a compression chamber. Holding the orbiting scroll between the fixed scroll and the inside of the sealed container is divided into an airtight motor room and a discharge chamber, and a discharge pipe is connected to the discharge chamber, and a suction pipe is connected to the compression unit. Connecting a first inlet / outlet pipe and a second inlet / outlet pipe to the electric motor chamber, sucking low-pressure refrigerant from the suction pipe during cooling operation, and discharging the high-pressure refrigerant compressed by the compression section into the discharge chamber and the discharge pipe. The refrigerant flows from the first inlet / outlet pipe to the electric motor room via the second inlet / outlet pipe, and is discharged to the refrigerant circuit from the second inlet / outlet pipe to form a high pressure internal compressor. The motor room from the second access pipe Inhalation, first through the inlet / outlet pipe, the suction pipe, the high-pressure refrigerant compressed in the compression section, discharged through the discharge chamber, the discharge pipe and discharged to the refrigerant circuit, the compressor is an internal low pressure type And a horizontal scroll compression provided at the back of the orbiting scroll of the compression section, wherein the pressure of a central back pressure chamber provided between an annular small seal and a large seal dividing the back by a concentric circle is set to an intermediate pressure. In the machine, a communication path communicating the discharge chamber and the central back pressure chamber is formed continuously with the fixed scroll and the main frame, and a throttle device is inserted into the communication path. Horizontal scroll compressor. 2. The horizontal scroll compressor according to claim 1, wherein the communication path is formed below the compression section. 3. The discharge chamber side entrance of the communication passage is formed below the fixed scroll, the communication passage extends from the entrance to the upper side of the fixed scroll, and the communication passage is formed above the compression portion. The horizontal scroll compressor according to claim 1, wherein the horizontal scroll compressor is formed continuously with the main frame. 4. A communication port formed above the compression section and communicating with the communication path above, and
2. A high pressure introducing member having a communication hole penetrating therethrough and a discharge chamber side inlet below, and the high pressure introducing member is fixedly abutted on the discharge chamber side of the fixed scroll. Horizontal scroll compressor. 5. An outlet of the communication passage is opened above the small seal, and the communication passage communicates with a groove bottom of the large seal. The horizontal scroll compressor as described. 6. The horizontal scroll compressor according to claim 1, wherein a plurality of said throttle devices are provided. 7. The horizontal scroll compressor according to claim 4, wherein said expansion device is provided integrally with said high-pressure introducing member. 8. The filter according to claim 1, wherein a filter is provided at an inlet of the communication passage on the discharge chamber side.
The horizontal scroll compressor as described.