JP2003097447A - Closed compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems such as seal leakage and pipe damage at the connection part of a refrigerant circuit and a compressing mechanism part for a closed compressor contained in a hermetically sealed container via an elastic support so that the compressing mechanism part and the hermetically sealed container are relatively movable to each other. SOLUTION: A connecting pipe 5 connected with the refrigerant circuit is made in concentric double tube structure, and an outer tube 5b is fixed to the hermetically sealed container 1 and an inner tube 5a is connected to the compressing mechanism part 3. Thus a pipe connection structure turns out to be a flexible structure and is capable of following the relative displacement between the hermetically sealed container 1 and the compressing mechanism part 3. Accordingly the seal leakage or pipe damage is prevented.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an air conditioner,
The present invention relates to a compressor such as a refrigerating device, and more specifically, to a hermetic compressor including a connection pipe that connects a refrigerant circuit of a refrigeration cycle and a compression mechanism portion of the hermetic compressor.

[0002]

2. Description of the Related Art A conventional hermetic compressor is constructed, for example, as shown in the scroll compressor of FIG. Figure 5
In the figure, 1 is a closed container, and the electric motor 2a
A drive mechanism section 2 having the above, and a compression mechanism section 3 having a compression chamber 3a for compressing the refrigerant are housed. The drive mechanism section 2 and the compressor rear section 3 are supported by an elastic support 4 provided in the closed container 1 so as to be movable relative to the closed container 1. With this structure, the transmission of mechanical noise generated inside the compressor to the outside of the compressor is reduced, and the vibration and noise of the compressor are reduced. Also,
Reference numeral 5 is a connection pipe that connects the refrigerant circuit of the refrigeration cycle and the compression mechanism portion 3, and 9 is a conduction hole provided in the compression mechanism portion, which communicates with the compression chamber 3a. The connection pipe 5 has one end connected to the refrigerant circuit and the other end connected to the conduction hole 9 of the compression mechanism section 3. This scroll compressor is an example of a hermetic compressor equipped with a liquid injection mechanism, and the connection pipe 5 and the conduction hole 9 are connected to the refrigerant circuit of the refrigeration cycle to form a part of the liquid injection pipe.

FIG. 6 is a partially enlarged view showing a connection state between the connection pipe 5 and the conduction hole 9 provided in the compression mechanism section 3.
5 and 6, the connection pipe 5 includes an internal connection portion 5d connected to the conduction hole 9 of the compression mechanism portion 3, a pipe body portion 5e, and an external connection portion 5c connected to the refrigerant circuit of the refrigeration cycle. A guide pipe 6 is provided in the closed container 1, the connection pipe 5 penetrates the guide pipe 6, and the pipe body 5e is fixed to the closed container 1 by the guide pipe 6 and copper brazing welding 12. Further, the guide tube 6 is fixed to the closed container 1 by the closed container 1.
Since it is generally a steel plate, a hole is made in the closed container 1, a guide tube 6 is put in this hole, and silver brazing welding 11 using flux is used.

Further, the connection pipe 5 and the conduction hole 9 provided in the compression mechanism portion 2 are connected by an internal connection portion 5d of the connection pipe 5 at the opening of the conduction hole 9 opposite to the compression chamber 3a. 7
It is performed by being inserted together with, supported and fixed. As a result, the refrigerant circuit (here, the liquid injection pipe) is partitioned from the inside 1a of the closed container. Then, the connecting pipe 5 is welded to the guide pipe 6 by copper brazing 1
It is fixed to the closed container 1 by 2, and the inside 1a of the closed container is closed, and the inside 1a of the closed container and the outside 1b of the closed container are partitioned. The pipe body 5e and the external connection portion 5
c, the connection between the pipe body 5e and the internal connection 5d is made by silver brazing welding 11 as shown in FIG. Also,
Before the above-mentioned copper brazing welding 12 work, the drive mechanism 2,
The compression mechanism 3, the elastic support 4, and the guide tube 6 are usually incorporated in the closed container 1.

[0005]

In the conventional connection structure of the refrigerant circuit and the compression mechanism portion 3 in the closed container 1, the relative position between the compression mechanism portion 3 and the closed container 1 is the heating operation,
Changes in thermal expansion due to changes in the temperature distribution inside the compressor due to operation modes such as cooling operation, effects of copper brazing during compressor assembly, effects of thermal expansion due to hermetic welding after accommodating closed container parts, and It greatly changes due to the operation of the compressor by the elastic support body 4 which is a factor, the displacement of the compression mechanism portion 2 due to the stop and the like. Therefore, when the internal connecting portion 5d of the connecting pipe 5 is sealed and inserted into and connected to the through hole 9 of the compression mechanism portion 3 by the sealing material 7, the connecting pipe 5 is operated at the time of operation of the compressor due to a relative positional change. The seal material 7 is abraded, or excessive stress is generated when the compressor is operated or stopped, and the connecting pipe 5 is cracked, resulting in a compressor failure.

If the connecting pipe 5 is made long to have a flexible structure so as to absorb a positional change, the space becomes extremely bulky. In addition, since the seal material 7 and the copper brazing portion 12 are located close to each other due to the parts configuration of the compressor, the seal material 7 is temporarily in a high temperature state, so that the temperature resistance is high and the cost is high. There is no choice but to use a different sealing material 7.

Further, when the internal connecting portion 5d of the connecting pipe 5 is inserted into the through hole 9 of the compression mechanism portion 2 by press-fitting in order to save the trouble of using the seal material, it is the same for the above reason due to the change in the position. Performance and reliability will be reduced.

As described above, the problems such as the difficulty in assembling the pipe connection between the refrigerant circuit of the refrigeration cycle and the compression mechanism portion 3 in the closed container 1 and the insufficient reliability are as described above. Not only becomes a problem in the hermetic compressor in which the drive mechanism section 2 and the compressor mechanism section 3 shown in FIGS. 5 and 6 are supported by the elastic support body 4, but the drive mechanism section 2 and the compressor mechanism section 3 are hermetically sealed. Even with a hermetic compressor fixed at 1, there are some differences, but this is a problem as well.

Further, in this conventional example, a hermetic compressor equipped with a liquid injection mechanism is assumed, the refrigerant circuit is a liquid injection pipe, the connecting pipe 5 is a part of the liquid injection pipe, and a liquid reservoir is provided outside the compressor. Although the case where the sealed container is connected to form the refrigerant circuit is described, the closed container is the high-pressure shell, the connection pipe 5 is a part of the refrigerant suction pipe, and the evaporator is connected to the refrigerant circuit outside the compressor. When forming a refrigerant circuit, when the closed container is a low-pressure shell, the connection pipe 5 is a part of the refrigerant discharge pipe, and a condenser is connected to the refrigerant circuit outside the compressor to form the refrigerant circuit. Similarly, in the case of a compressor equipped with a capacity control mechanism, the connection pipe 5 is a part of a pressure control pipe for capacity control, and a discharge gas chamber is connected to a refrigerant circuit outside the compressor to form a refrigerant circuit. Case etc. A similar problem exists in the case of these two or more thereof.

The present invention solves the above-mentioned conventional problems relating to the pipe connection between the refrigerant circuit of the external refrigeration cycle and the compression mechanism section in the closed container, and the compressor mechanism section and the drive mechanism section are In a hermetic compressor fixed to a hermetic container and a hermetic compressor supported by an elastic support,
It is an object of the present invention to provide a compressor having good assembling property of a hermetic compressor, space saving, low cost, and high reliability in connection with an external refrigerant circuit and a compression mechanism section in a hermetic container.

[0011]

[Means for Solving the Problems] Claim 1 according to the present invention
The hermetic compressor is a hermetic compressor including a drive mechanism section having an electric motor and the like and a compression mechanism section having a compression chamber for compressing a refrigerant in a hermetic container, in which one end has an inner tube and an outer tube. The inner pipe is connected to the refrigerant circuit of the refrigeration cycle on the other end side, and the inner pipe is connected to the conduction part of the compression mechanism part on the other end side.
The outer tube is provided with a connection pipe fixed to the closed container.

The hermetic compressor according to a second aspect of the present invention is the hermetic compressor according to the first aspect, wherein the inner pipe of the connecting pipe and the conducting portion of the compression mechanism section are provided with a seal material. It is connected.

The hermetic compressor according to a third aspect of the present invention is the hermetic compressor according to the first aspect, wherein the inner pipe of the connecting pipe and the conducting portion of the compression mechanism part are the inner pipe of the compression mechanism part. It is connected by being press-fitted into the opening of the conducting portion.

A hermetic compressor according to a fourth aspect of the present invention is the hermetic compressor according to any one of the first to third aspects, wherein the compression mechanism portion and the drive mechanism portion are hermetically sealed. It is supported by an elastic support provided on the container.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. However, in each embodiment,
The same or corresponding portions as those of the conventional technique are designated by the same reference numerals, and the description thereof will be omitted.

Embodiment 1. FIG. 1 is a vertical cross-sectional view of the hermetic compressor according to the first embodiment, and FIG. 2 is an enlarged cross-sectional view of the main part of the same. In the figure, a connection pipe 5 is connected to an internal connection portion 5d inserted into and connected to an opening of a conduction hole 9 which is a conduction portion to the compression chamber 3a formed in the compression mechanism portion 3 and a refrigerant circuit outside the closed container 1. It is composed of an external connection part 5c to be connected and an inner pipe 5a and an outer pipe 5b having a concentric double pipe structure. The inner pipe 5a and the outer pipe 5b having the double pipe structure are joined together by silver-rolling welding with the external connection portion 5c at one end side, and only the inner pipe 5a communicates with the external connection portion 5c (hence, the external connection portion 5c). 5c is the inner tube 5
can be regarded as part of a). Inner tube 5a and outer tube 5 having a double tube structure
The other end side of b is separated, and the inner pipe 5a is silver-rolled and welded so as to communicate with the inner connecting pipe 5d (hence, the inner connecting pipe 5d can be regarded as a part of the inner pipe 5a), and the outer pipe 5b. Is fixed to the guide tube 6 provided in the closed container 1 by silver brazing welding. In the connection pipe 5, the inner pipe 5a, the outer pipe 5b, the external connection portion 5c, and the internal connection portion 5d are each silver-rolled as described above.
After being joined by attachment welding and the tip of the internal connecting portion 5d is inserted and connected to the opening of the through hole 9 via the seal material 7, the outer pipe 5b is connected to the guide pipe 6 provided in the closed container 1. It is fixed by copper brazing welding.

The inner pipe 5a of the double pipe structure of the connection pipe 5 communicates with the refrigerant circuit on one end side and communicates with the conduction hole 9 of the compression mechanism section 2 on the other end side to form a liquid injection pipe of the refrigerant circuit. Then, the refrigerant circuit is partitioned from the inside 1a of the closed container, and the outer pipe 5b having the double pipe structure of the connection pipe 5 is fixed to the closed container 1 to partition the inside 1a of the closed container from the outside 1b of the closed container. In addition, the inner pipe 5 forming the liquid injection pipe
A supplies the liquid refrigerant from the liquid reservoir of the refrigerant circuit to the compression chamber 3a to which it is conducted to cool the inside of the compression chamber 3a. The compression mechanism section 3
In the case where the hermetic compressor is a scroll compressor as shown in FIGS. 1 and 2, there are a fixed scroll, an oscillating scroll, a compression chamber 3a formed by these, and a drive mechanism section. Two
Is an electric motor 2a or the like.

Next, the principle of operation will be described. When the compression mechanism portion 3 supported by the elastic support 4 provided in the closed container 1 is displaced with respect to the closed container 1, the path through which the displacement is transmitted is the compression mechanism portion, the internal connection portion 5d of the connection pipe 5. , The inner pipe 5a of the connecting pipe 5, the outer connecting portion 5c of the connecting pipe 5, the outer pipe 5b of the connecting pipe 5, the guide pipe 6, and the hermetically sealed container 1. When this path is approximated to a simple beam, the length of the beam is Therefore, the flexible structure is long and therefore the allowable fluctuation range of the internal connecting portion 5d of the connecting pipe 5 with respect to the closed container 1 is large. That is, the flexible structure enables displacement follow-up. Therefore, it is possible to cope with the relative displacement between the closed container 1 and the compression mechanism portion 2 via the elastic support 4.

In this embodiment, the inner pipe 5a and the outer pipe 5b having a double pipe structure are combined on one end side, the inner pipe is connected to the refrigerant circuit outside the hermetic compressor, and the other end side is separated. The flexible structure including the inner pipe 5a connected to the compression mechanism portion 3 and the outer pipe 5b fixed to the closed container 1 has the compression mechanism portion 3 and the drive mechanism portion 2 fixed to the closed container 1. It is also effective when applied to a hermetic compressor. That is, in the hermetic compressor in which the compression mechanism unit 3 and the drive mechanism unit 2 are fixed to the hermetic container 1, when connecting the refrigerant circuit outside the compressor to the compressor, the connection pipe 5
Is fixed to the closed container 1 and is connected to the opening of the through hole 9 provided in a portion of the compression mechanism 3 which is not directly fixed to the closed container 1 in the closed container 1. 5 and the fixed part of the closed container 1 and the connecting part of the connecting pipe 5 and the opening of the through hole 9 are relatively displaced due to a change in thermal expansion due to the operation mode of the compressor, the operation of the compressor, Relative displacement or the like occurs due to the stop, and the compression mechanism unit 3 and the drive mechanism unit 2
However, there is a similar problem with the hermetic compressor supported by the elastic support 4 in the hermetic container 1, and there is the same kind of problem. Applying the technique of the present embodiment, the connection pipe 5 and the through hole 9 are Preventing the leakage of the refrigerant or the like at the connecting portion of the openings is particularly effective from the viewpoint of reliability.

Embodiment 2. FIG. 3 is an enlarged sectional view of essential parts showing a hermetic compressor according to a second embodiment. In the figure, an O-ring 7 a is inserted as a seal material 7 between the internal connection portion 5 d of the connection pipe 5 (considered as a part of the inner pipe 5 a) and the conduction hole 9. That is, the inner pipe 5a and the compression mechanism portion 3 are connected via the O-ring 7a which is the seal material 7. Others are the same as those in the first embodiment.

Next, the principle of operation will be described. Connection pipe 5
The internal connection portion 5d is connected to the opening of the conduction hole 9 through an O-ring 7a which is the seal material 7. A large amount of heat energy generated by the copper brazing welding 12 work at the time of assembling the compressor reaches the O-ring 7a. The heat flux is as follows: guide pipe 6 → outer pipe 5b of connection pipe 5 → external connection portion 5c of connection pipe 5 → connection The inner pipe 5a of the pipe 5 → the inner connecting portion 5d of the connecting pipe 5 → the O-ring 7a is transmitted, and the heat transfer passage is long, and the inner pipe 5a of the connecting pipe 5 has a small cross-sectional shape. Is small and is very effective in suppressing the temperature rise of the O-ring 7a due to heating for a short time. Therefore, an inexpensive O-ring 7a that does not require high heat resistance can be used. As in the first embodiment, it is possible to deal with relative displacement between the closed container 1 and the compression mechanism portion 2 via the elastic support 4.

Embodiment 3. FIG. 4 is an enlarged sectional view of essential parts showing a hermetic compressor according to the third embodiment. In the figure, the internal connection portion 5d of the connection pipe 5 (considered as a part of the inner pipe 5a)
Are connected to the opening of the through hole 9 by press fitting. That is, the inner pipe 5a and the compression mechanism portion 3 are connected by press-fitting the inner pipe 5a into the opening of the compression mechanism portion 3. Others are the same as those in the first embodiment.

Next, the principle of operation will be described. Connection pipe 5
The internal connection portion 5d is connected to the opening of the conduction hole 9 by press fitting. Since the connection pipe 5 is fixed to the closed container 1 and connected to the compression mechanism part 3 by using the flexible structure as described in the first embodiment, the compression mechanism part 3 is not attached to the closed container 1. It is possible to follow even if it is displaced, O-ring 7a
Even if there is no such sealing material 7, problems such as refrigerant leakage do not occur. The seal material 7 is not necessary, the work steps can be reduced, and the workability is good.

The connection pipe 5 of the present invention has been described in the above embodiment with an example of a part of the injection pipe of the scroll compressor equipped with the liquid injection mechanism. However, the connection pipe 5 is not limited to this, and is hermetically sealed. It can also be used as a refrigerant suction pipe whose container is a high-pressure shell, a refrigerant discharge pipe whose closed container is a low-pressure shell, and a pressure-introducing pipe for capacity control of a compressor equipped with a capacity control mechanism. Further, the hermetic compressor can also be used as a rotary compressor, a reciprocating compressor, etc. in addition to the scroll compressor. In a scroll compressor, it is used as an injection pipe of a liquid injection mechanism, a pressure introduction pipe for capacity control of a capacity control mechanism, a suction pipe of a refrigerant whose closed container is a high pressure shell, and a discharge pipe of a refrigerant whose closed container is a low pressure shell. In the rotary compressor and the reciprocating compressor, the hermetically sealed container can be used as a refrigerant suction pipe and the hermetically sealed container is a low pressure shell as a refrigerant discharge pipe.

[0025]

As described above, the hermetic compressor according to claim 1 of the present invention comprises a drive mechanism portion having an electric motor and the like, and a compression mechanism portion having a compression chamber and the like for compressing a refrigerant in a hermetic container. In the hermetic compressor provided with, one end side has a double pipe structure in which the inner pipe and the outer pipe are united and the other end side is separated, and the one end side is connected to the refrigerant circuit of the refrigeration cycle with the inner pipe and On the end side, the inner pipe is connected to the conduction part of the compression mechanism part, and the outer pipe is provided with the connection pipe fixed to the closed container, so that the assembling property is good, the space is saved, the reliability is high, and the external device is external. A hermetic compressor in which the refrigerant circuit and the hermetic compressor are connected by piping is obtained.

The hermetic compressor according to a second aspect of the present invention is the hermetic compressor according to the first aspect, wherein the inner pipe of the connecting pipe and the conducting portion of the compression mechanism portion are provided with a seal material. Since they are connected, the inner pipe of the connection pipe and the conducting portion of the compression mechanism portion can be connected with space saving, low cost, and high reliability.

Further, a hermetic compressor according to a third aspect of the present invention is the hermetic compressor according to the first aspect, wherein the inner pipe of the connecting pipe and the conducting part of the compression mechanism part are the inner pipe of the compression mechanism part. Since the connection is made by press-fitting into the opening of the conducting part, the assembling property is good, the space is saved, the cost is low, and the connection is highly reliable.

A hermetic compressor according to a fourth aspect of the present invention is the hermetic compressor according to any one of the first to third aspects, wherein the compression mechanism portion and the drive mechanism portion are hermetically sealed. Since it is supported by the elastic support provided in the container,
It is possible to prevent a mechanical noise generated inside the hermetic compressor from being transmitted to the outside of the compressor, and to obtain a hermetic compressor with a highly reliable pipe connection between the external refrigerant circuit and the hermetic compressor.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a hermetic compressor according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of the hermetic compressor according to the first embodiment of the present invention.

FIG. 3 is an enlarged sectional view of a main part of a hermetic compressor according to a second embodiment of the present invention.

FIG. 4 is an enlarged sectional view of a main part of a hermetic compressor according to a third embodiment of the present invention.

FIG. 5 is a vertical sectional view of a conventional hermetic compressor.

FIG. 6 is an enlarged sectional view of a main part of a conventional hermetic compressor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 closed container, 2 drive mechanism part, 2a electric motor, 3 compression mechanism part, 3a compression chamber, 4 elastic support body, 5 connection piping, 5a inner tube, 5b outer tube.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Katsuhiko Wakayama             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. F term (reference) 3H003 AA05 AB03 AC03 BB07 BC00                       CD07                 3H029 AA01 AA02 AA11 AA12 AA14                       AB03 BB01 BB16 BB32 BB42                       BB44 CC09 CC22 CC23 CC25

Claims (4)

[Claims] 1. A hermetic compressor provided with a drive mechanism section having an electric motor and the like and a compression mechanism section having a compression chamber for compressing a refrigerant in a hermetic container, wherein an inner pipe and an outer pipe are combined on one end side. , The other end has a double pipe structure in which these are separated, and the inner pipe is connected to the refrigerant circuit of the refrigeration cycle on the one end side, and the inner pipe is electrically connected to the compression mechanism portion on the other end side. A hermetic compressor, characterized in that the outer pipe is provided with a connection pipe that is fixed to the hermetic container. 2. The hermetic compressor according to claim 1, wherein the inner pipe of the connection pipe and the conducting portion of the compression mechanism portion are connected via a seal material. 3. The inner pipe of the connection pipe and the conducting portion of the compression mechanism portion are connected by press-fitting the inner pipe into an opening of the conducting portion of the compression mechanism portion. The hermetic compressor according to Item 1. 4. The compression mechanism section and the drive mechanism section,
The hermetic compressor according to any one of claims 1 to 3, which is supported by an elastic support provided in the hermetic container.