JP2003314453A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor which reduces the temperature rise of a lubricating oil passage and a control valve by preventing the temperature rise of a shaft seal part. <P>SOLUTION: A front housing 2 comprises a first intake gas passage 25a for guiding intake gas from an intake port 21 as the inlet of the intake gas directly to the shaft seal part 23 and a second intake gas passage 25b communicating with the first intake gas passage 25a. The shaft seal part 23 is positioned midway in the intake gas passage formed of the first and second intake gas passages 25a and 25b. A main housing 25 comprises a third intake gas passage 35a allowed to communicate with the second intake gas passage 25b to guide the intake gas to a compressor body. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor that drives a compressor body with a drive shaft to obtain a compression action of intake gas.

[0002]

2. Description of the Related Art Conventionally, there is known a compressor having a compressor body inside a casing. As an example of the compressor, there is one in which the inside of the casing has the same pressure as the discharge pressure of the compressor during the compression operation.

FIG. 2 is a longitudinal sectional view showing a compressor according to the prior art. The illustrated compressor is generally called a high-pressure type scroll compressor and is suitable for use in an air conditioner for automobiles. Therefore, this case will be described here as an example.

This scroll type compressor includes a casing 1 whose one end in the axial direction is closed. The casing 1 is open at the other end in the axial direction. At the open end of the casing 1, a front housing 2 serving as a shaft support is provided. The front housing 2 is fixed to the casing 1 by a plurality of screw members (not shown). The front housing 2 has a through hole 2a formed in the center thereof. This through hole 2
The drive shaft 4 is arranged in a so as to penetrate therethrough. The drive shaft 4 is rotatably supported by the front housing 2 via a ball bearing 5.

A drive device 6 is attached to the projecting end of the drive shaft 4. The drive device 6 includes a pulley 7 rotatably supported by a protruding end portion of the front housing 2.
And an electromagnetic clutch 8 that transmits or interrupts the rotational force of the pulley 7 to the drive shaft 4. Although illustration is omitted, for example, the rotational force of an automobile engine is transmitted to the pulley 7 via a transmission device.

A compressor body composed of a fixed scroll member 9 and a movable scroll member 10 is arranged in a space where the casing 1 and the front housing 2 cooperate with each other to seal them. The fixed scroll member 9 is fitted inside the casing 1 and fixed to the casing 1 by a plurality of screws (not shown), and forms a discharge chamber 12 in cooperation with the closed end of the casing 1. Plate body 13 and a first spiral body 14 formed on one surface of the first plate body 13.
have. A discharge hole 15 is formed in the center of the first plate body 13.

The movable scroll member 10 is the second plate 1
6 and a second spiral body 17 that is formed on one surface of the second plate body 16 and that meshes with the first spiral body 14. First
The compression chamber 18 of the compressor body is formed by the plate body 13, the first spiral body 14, the second spiral body 16, and the second spiral body 17.
Is formed. The movable scroll member 10 is eccentrically connected to the drive shaft 4, and is disposed inside the casing 1 so as to be able to make a circular orbital motion without rotating by a known mechanism.

A suction port 21 for sucking the refrigerant gas in a gaseous state, that is, the refrigerant gas as the suction gas is formed in the upper portion of the front housing 2. The suction port 21 extends to the vicinity of the drive shaft 4 in the radial direction.

On the other hand, a discharge port 22 for discharging the refrigerant gas is formed on the upper wall of the casing 1. The discharge port 22 is formed in the vicinity of the open end of the casing 1 and has a large number of notches or recesses formed in the fixed scroll member 9 around the first plate body 13 and the remaining inner space of the casing 1. It is connected to the discharge chamber 12 via the.

Further, this scroll type compressor has a shaft seal portion 23 for sealing around the drive shaft 4 and a main scroll fixed to a fixed scroll member 9 arranged between the front housing 2 and the movable scroll member 10 by a bolt 24. And a housing 25. Shaft seal part 2
3 is positioned so as to face the suction port 21. A space (not shown) for communicating the discharge port 22 with the discharge chamber 12 is also formed between the main housing 25 and the casing 1.

The main housing 25 is provided with a suction gas passage 26 for guiding the suction gas to the compressor body. Further, in the front housing 2, a first communication hole 27 that allows the intake port 21 to communicate with the intake gas passage 26, and the intake port 2
A second communication hole 28 is provided as a bypass path that connects 1 to the shaft seal portion 23.

In this way, the suction port 21 substantially extends from the radial end surface of the front housing 2 toward the drive shaft 4, and the shaft seal portion 23 extending from this introduction portion.
It has a structure equivalent to that having an extension extending around.

As a result, during operation, the intake gas is supplied with a large amount of intake gas to the compressor body through the first communication hole 27 and the intake gas passage 26, as shown by the arrow, and the second intake gas is supplied. It is also supplied to the shaft seal portion 23 through the communication hole 28, and cools the shaft seal portion 23.

As described above, this scroll type compressor uses the inner space of the casing 1 as a passage for the high pressure gas discharged from the compressor body. The inner space of the casing 1 is a high pressure chamber 3 that serves as a passage for high pressure gas discharged from the compressor body by the main housing 25.
1 and an intermediate pressure chamber 32, which has an intermediate pressure between the pressure of the high pressure chamber 31 and the pressure of the shaft seal portion 23 during operation. The intermediate pressure chamber 32 is adjacent to the shaft seal portion 23 via a wear resistant material 33 that receives the thrust force of the drive shaft 4.

Further, the main housing 25 includes a high pressure chamber 3
1 and the intermediate pressure chamber 32 are connected to each other, and a control valve 35 as a flow control means for controlling the flow of the lubricating oil in the lubricating oil passage 34 is provided. Thus, the high pressure chamber 31
During operation, the lubricating oil stored in the bearing section 4 passes through the intermediate pressure chamber 32 and the vicinity of the wear resistant material 33, if necessary.
It is designed to leak to 1, 42 with decompression.

When the movable scroll member 10 is orbitally moved by the rotational force of the drive shaft 4, the refrigerant gas is sucked through the suction port 21. This sucked refrigerant gas is the first
The compression chamber 1 between the fixed scroll member 9 and the movable scroll member 10 through the communication hole 27 and the intake gas passage 26 of
8 is entered and compressed here. The compressed refrigerant gas is discharged into the discharge chamber 12 through the discharge hole 15. Further, the high pressure gas in the discharge chamber 12 is the first gas of the fixed scroll member 9.
It is discharged from the discharge port 22 through the notch or recess provided in the plate body 13 and the high pressure space 31.

An oil sump chamber 36 is formed below the discharge chamber 12 so as to communicate with it. This oil sump chamber 36
Is for storing the lubricating oil. During operation, the suction gas is supplied to the compressor body through the first communication hole 27 and the suction gas passage 26, and is also supplied to the shaft seal portion 23 through the second communication hole 28 to cool the shaft seal portion 23. It will be.

[0018]

During operation of the compressor described above, a large amount of intake gas is supplied to the main body of the compressor through the first communication hole 27 and the intake gas passage 26. Although it is also supplied to the shaft seal portion 23 through the second communication hole 28 to cool the shaft seal portion 23, there is a problem that the sealing function is easily impaired when the temperature of the shaft seal portion 23 rises.

Further, the main housing 25 is provided in the high pressure chamber 3
1 is provided with a lubricating oil passage 34 that communicates with the intermediate pressure chamber 32, and a control valve 35 as a flow control unit that controls the circulation of the lubricating oil in the lubricating oil passage 34. While operating, if necessary, it leaks through the intermediate pressure chamber 32 through the vicinity of the wear resistant material 33 to the shaft seal portion 23 with decompression, but is located near the high pressure chamber 31. If the temperature of the lubricating oil passage 34, the lubricating oil, and the control valve 35, etc., rises, the valve function is likely to be impaired.

Therefore, an object of the present invention is to provide a compressor capable of preventing an increase in temperature of a shaft seal portion and reducing an increase in temperature of a lubricating oil passage, a lubricating oil, a control valve, etc. located in the vicinity. To provide.

[0021]

According to the present invention, a front housing, a drive shaft penetrating the front housing, a shaft seal portion for sealing around the drive shaft, and a drive shaft driven by the drive shaft are provided. In a compressor including a compressor main body that obtains a compression action of intake gas, and a main housing arranged between the front housing and the compressor main body,
The front housing communicates with an intake port that serves as an inlet for the intake gas, a first intake gas passage that guides the intake gas to the shaft seal portion directly from the intake port, and the first intake gas passage. A second suction gas passage, the shaft seal portion is located in the middle of a suction gas passage formed by the first and second suction gas passages, and the main housing is configured to store the suction gas. A compressor having a third suction gas passage communicating with the second suction gas passage so as to be guided to the compressor body is obtained.

Further, according to the present invention, a high-pressure gas discharged from the compressor main body is included, which includes a casing that cooperates with the front housing to enclose the compressor main body and the main housing. And the inner space of the casing has a high pressure chamber that serves as a passage for the high pressure gas discharged from the compressor body by the main housing, a pressure of the high pressure chamber and a pressure of the shaft seal portion during operation. Is divided into an intermediate pressure chamber having an intermediate pressure between the high pressure chamber and the intermediate pressure chamber, and a lubricating oil passage in the lubricating oil passage for communicating the high pressure chamber with the intermediate pressure chamber. There is provided a control valve for controlling, and the compressor book is characterized in that the third suction gas passage is provided in the vicinity of the lubricating oil passage and the control valve.

Further, in the above-mentioned compressor, the second suction gas passage has one or more, and the second suction gas passage extends in the radial direction and communicates with the third suction gas passage. It may have been done.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a vertical sectional view showing a compressor according to an embodiment of the present invention. The compressor shown in FIG. 1 will be described by taking a compressor similar to the compressor suitable for use in the air conditioner for automobiles described in the related art as an example. Note that the same parts as those of the compressor shown in FIG.

Referring to FIG. 1, a suction port 21 for sucking a refrigerant in a gaseous state, that is, a refrigerant gas as an intake gas is formed in an upper portion of the front housing 2. The suction port 21 extends to the vicinity of the drive shaft 4 in the radial direction.

On the other hand, a discharge port 22 for discharging the suction gas is formed on the upper wall of the casing 1. The discharge port 22 is formed in the vicinity of the open end of the casing 1, and has a large number of notches or recesses formed in the periphery of the first plate 13 of the fixed scroll member 9 and the remaining inner space of the casing 1. It is connected to the discharge chamber 12 via the.

Further, this scroll type compressor is fixed to the shaft seal portion 23 for sealing around the drive shaft 4 and the fixed scroll member 9 arranged between the front housing 2 and the movable scroll member 10 with bolts 24. The main housing 25 is included. Shaft seal part 2
3 is positioned so as to face the suction port 21. A space (not shown) for communicating the discharge port 22 with the discharge chamber 12 is also formed between the main housing 25 and the casing 1.

In the front housing 2, as a suction gas passage, the first suction gas passage 2 for guiding the suction gas indicated by the arrow directly from the suction port 21 to the shaft seal portion 23.
5a and a second suction gas passage 25b that guides the suction gas to the compressor body following the first suction gas passage 25a. In other words, the shaft seal portion 23 is located in the middle of the suction gas path formed by the first and suction gas passages 25a and 25b, and is provided at the portion where the suction gas is directly introduced.

The main housing 25 is provided with a third suction gas passage 25c communicating with the second suction gas passage 25b. In this way, the intake port 21 substantially extends from the radial end surface of the front housing 2 toward the drive shaft 4, and an introduction portion extending from the introduction portion to the shaft seal portion 23.
It has a structure equivalent to that having an extension extending around.

As a result, the intake gas during operation passes through the shaft seal portion 23 while passing through the first and second intake gas passages 25a and 25b, and then the second intake gas passage 25b.
Is supplied to the compressor body through the third suction gas passage 25c.

Therefore, the suction gas introduced from the suction port 21 directly enters the shaft seal portion 23.
Since 3 is cooled, the temperature rise of the shaft seal portion 23 can be prevented.

Further, as described above, this scroll type compressor uses the inner space of the casing 1 as a passage for the high pressure gas discharged from the compressor body.
The inner space of the casing 1 has a high pressure chamber 31 that serves as a passage for the high pressure gas discharged from the compressor body by the main housing 25, the pressure of the high pressure chamber 31 during operation, and the shaft seal portion 2.
It is divided into an intermediate pressure chamber 32 having a pressure intermediate to the pressure of 3.

Further, the main housing 25 has a lubricating oil passage 34 which connects the high pressure chamber 31 and the intermediate pressure chamber 32,
A control valve 35 is provided as a flow control means for controlling the flow of the lubricating oil in the lubricating oil passage 34. Thus, the high pressure chamber 3
In operation, the lubricating oil stored in No. 1 passes through the intermediate pressure chamber 32 and the vicinity of the wear-resistant material 33, and if necessary, the bearing unit 4
It is designed to leak to 1, 42 with decompression.

When the movable scroll member 10 is orbitally moved by the rotational force of the drive shaft 4, the suction gas is sucked through the suction port 21. The sucked-in suctioned gas enters the compression chamber 18 between the fixed scroll member 9 and the movable scroll member 10 through the first, second and third suction gas passages 25a, 25b, 25c, and is compressed therein. The compressed suction gas is discharged into the discharge chamber 12 through the discharge hole 15. Further, the high pressure gas in the discharge chamber 12 is discharged from the discharge port 22 through the notch or the recess provided in the first plate body 13 of the fixed scroll member 9 and the high pressure space 31.

By the way, if the temperature of the lubricating oil passage 34 and the lubricating oil located near the high pressure chamber 31, and the temperature of the control valve 35, etc. rises, the valve function is likely to be impaired. However, since the third intake gas passage 25c passes through the main housing 25 in the vicinity of the lubricating oil passage 34 and the control valve 35, after the shaft seal portion 23 is cooled and the shaft seal portion 23 is cooled, The intake gas can be effectively used to reduce the temperature rise of the lubricating oil passage 34, the lubricating oil, and the control valve 35.

Furthermore, in the front housing 2, one or more second intake gas passages 25b are provided.
Specifically, three lines are provided at equal angular intervals. Each of these second suction gas passages 25b extends in the radial direction and is connected to the third suction gas passage 25c.

In the above description, use in an air conditioner for automobiles has been described as an example, but it goes without saying that use in various fields is not hindered.

[0038]

As described above, according to the present invention,
During operation, the intake gas passes through the shaft seal portion while passing through the first and second intake gas passages, and is supplied to the compressor body from the second intake gas passage through the third intake gas passage. Since the suction gas introduced from directly cools the shaft seal portion, the temperature rise of the shaft seal portion can be prevented.

Further, since the third intake gas passage is provided in the main housing in the vicinity of the lubricating oil passage and the control valve, after passing through the shaft seal portion and cooling the shaft seal portion,
The intake gas can be effectively used to reduce the temperature rise in the lubricating oil passage, the lubricating oil, and the control valve.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a compressor according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a conventional compressor.

[Explanation of symbols]

1 casing 2 Front housing 4 drive shaft 6 drive 9 Fixed scroll member 10 Movable scroll member 12 Discharge chamber 15 discharge holes 18 compression chamber 21 Inhalation port 22 Discharge port 23 Shaft seal part 25 Main housing 25a First intake gas passage 25c Third intake gas passage 25b Second intake gas passage 26 Intake gas passage 27 First communication hole 28 Second communication hole 31 High pressure chamber 32 Intermediate pressure chamber 34 Lubricating oil passage 35 control valve 41,42 Bearing part

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[Procedure amendment]

[Submission date] June 13, 2002 (2002.6.1)
3)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

A compressor body composed of a fixed scroll member 9 and a movable scroll member 10 is arranged in a space where the casing 1 and the front housing 2 cooperate with each other to seal them. The fixed scroll member 9 is fitted inside the casing 1 and is fixed by bolts 24 to the main housing 2
A first plate body 13 fixed to No. 5 and forming a discharge chamber 12 in cooperation with the closed end portion of the casing 1, and the first plate body 13.
The first spiral member 14 is formed on one surface of the plate member 13. The discharge hole 1 is formed in the central portion of the first plate body 13.
5 is formed.

Claims (3)

[Claims] 1. A front housing, a drive shaft that penetrates the front housing, a shaft seal portion that seals around the drive shaft, and a compressor body that is driven by the drive shaft to obtain a compression action of intake gas. And a main housing arranged between the front housing and the compressor main body, wherein the front housing directly receives the suction gas from the suction port serving as an inlet of the suction gas. It has a first suction gas passage leading to the shaft seal portion and a second suction gas passage that continues to communicate with the first suction gas passage, and the shaft seal portion has the first and second suction gas passages. The main housing is located in the middle of an intake gas passage formed of a gas passage, and the main housing communicates with the second intake gas passage to guide the intake gas to the compressor body. Compressor, characterized in that it has a suction gas passage. 2. The compressor according to claim 1, further comprising a casing that cooperates with the front housing to enclose the compressor main body and the main housing, and discharge an inner space of the casing from the compressor main body. A high pressure gas passage, and the inner space of the casing is a high pressure chamber that serves as a passage for the high pressure gas discharged from the compressor body by the main housing, and the pressure of the high pressure chamber and the shaft seal during operation. Is divided into an intermediate pressure chamber having a pressure intermediate to the pressure of the section, and the main housing has a lubricating oil passage communicating the high pressure chamber with the intermediate pressure chamber, and a lubricating oil in the lubricating oil passage. A control valve for controlling the flow of the compressor, and the third suction gas passage is provided in the vicinity of the lubricating oil passage and the control valve. 3. The compressor according to claim 1, wherein the second intake gas passage has one or more, and the second intake gas passage extends in a radial direction to the first intake gas passage. A compressor characterized by being communicated with the suction gas passage 3.