JPH094578A - Fluid compressor - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a fluid compressor capable of reducing residual strain and the like generated in a case and effectively preventing cracks from occurring in the case when brazing a guide pipe. [Structure] Case 1 and 2 provided inside the case 1
A compression mechanism 3 having two compression cylinders 2, a through hole 16 provided in the case 1, and a guide pipe 15 provided through the through hole 16 and fixed to the case.
And a suction pipe 7 fixed to the guide pipe 15 while being inserted into the case 1 through the guide pipe 15 and connected to the cylinder 2 of the compression mechanism 3. The pipe 15 has two pipe portions 17 that respectively hold the two suction pipes 7.
a, 17b and a connecting portion 18 for connecting the two pipe portions 17a, 17b, and the through hole 16 has a shape for passing the pipe portions 17a, 17b of the guide pipe 15 and the connecting portion 18. is there.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a rotary type fluid compressor provided with a compression mechanism having two compression cylinders in a closed case.

[0002]

2. Description of the Related Art A two-cylinder type rotary fluid compressor used in an air conditioner is, for example, as shown in FIG. 4, and includes two compression cylinders 2 in a sealed case (pressure case) 1. The compression mechanism 3 and the electric motor 4 that drives the compression mechanism 3. In this fluid compressor, by operating the electric motor 4, the roller type piston 6 held at the lower end portion of the drive shaft 5 of the electric motor 4 is eccentrically rotated in each compression cylinder 2, and the compression is sequentially performed. The refrigerant sucked into the cylinder 2 is compressed.

The refrigerant to be compressed is shown in FIG.
It is adapted to be supplied into each compression cylinder 2 through two suction pipes indicated by. The suction pipe 7 is held by two guide pipes 8 projecting from the outer surface of the case 1.

The guide pipe 8 is previously fixed to the case 1, and the suction pipe 7 is attached to the case 1.
It has a function of guiding and supporting the suction pipe 7 when it is inserted therein. The guide pipe 8 and the suction pipe 7 are brazed to fix the suction pipe 7 and seal the case 1.

The guide pipe 8 is used to support the suction pipe 7 because the suction pipe 7 and the case 1 are directly brazed to each other when the guide pipe 8 is not provided. This is because the case 1 is heated to a high temperature during the brazing, and the heat may damage the compression mechanism 3 and the like housed in the case 1.

On the other hand, as described above, before housing the compression mechanism 3 in the case 1, the guide pipe 8 is fixed (brazed) to the case 1 in advance,
If only the guide pipe 8 and the connecting pipe 7 are brazed at the time of assembly, the case 1 is not heated to a high temperature, and the above-mentioned problems do not occur.

The fixing method of the guide pipe 8 is shown in FIG.
As shown in (a), first, two through holes 10 are formed in the side surface of the case 1 by punching (punching), and the guide pipe 8 is inserted into each through hole 10, and then the same figure (b).
As shown in FIG.
It is done by brazing and fixing.

[0008]

By the way, the conventional configuration has the following problems to be solved. That is, since the two through-holes 10 provided in the case 1 need to be provided in close proximity to each other, when punching out the through-holes, a narrow portion between the two through-holes 10 (see the drawing) The punching strain is likely to remain in the area (A). For this reason, when the guide pipe 8 is fixed by brazing, cracks (indicated by 11 in the figure) may occur particularly in the portion between the two through holes 10 due to the influence of thermal stress or the like.

Further, since the two guide pipes 8 are close to each other, there is a problem that it is very difficult to braze the portion located between the two guide pipes 8. If brazing is not performed properly, there is a possibility that refrigerant may leak from that portion or the case may crack.

The present invention has been made in view of such circumstances, and an object thereof is to reduce residual strain and the like generated in the case, and to crack the case when brazing the guide pipe. It is to provide a fluid compressor that can effectively prevent this.

[0011]

A first means of the present invention is to provide a closed case, a compression mechanism provided in the closed case and having two compression parts, and a through hole provided in the closed case. A guide pipe provided through the through hole and fixed to the case; and a suction pipe inserted into the case through the guide pipe to be connected to a compression portion of the compression mechanism and fixed to the guide pipe. In the fluid compressor having:
It is composed of two pipe portions that respectively hold the two suction pipes and a connecting portion that connects the two pipe portions, and the through hole has a shape that allows the pipe portion and the connecting portion of the guide pipe to pass therethrough. It is a feature.

A second means is the fluid compressor according to the first means, wherein the pipe portion of the guide pipe has a tubular shape, and the connecting portion is a flat plate type connecting the tubular pipe portions. It is characterized by having.

A third means is the fluid compressor according to the second means, wherein the through hole connects the circular hole portion through which the tubular pipe portion of the guide pipe is inserted and the circular hole portions, and It is characterized by comprising a connecting hole portion through which a flat plate-like connecting portion of the guide pipe is inserted.

A fourth means is the fluid compressor of the second means, characterized in that the guide pipe is integrally formed by forging or extrusion molding.

A fifth means is a hermetic case, a compression mechanism provided in the hermetic case and having two compression parts,
A through hole provided at a position facing the compression mechanism of the closed case, a closing plate fixed to the case in a state of closing the through hole, and two through holes provided in the closing plate, Two guide pipes provided through the two through holes and fixed to the closing plate, and inserted into the case through the guide pipes and connected to the compression parts of the compression mechanism, and the guide pipes. And a suction pipe fixed to the fluid compressor.

A sixth means is the fluid compressor of the fifth means, characterized in that the guide pipe is fixed to the closing plate through an auxiliary member provided in a through hole. is there.

[0017]

According to the first means, in the two-cylinder type fluid compressor, only one through hole for holding the guide pipe supporting the two suction pipes is required. Therefore, unlike the case where two through holes are provided close to each other, residual strain at the time of punching does not occur between the through holes. That is, since the circular holes are connected to each other as in the case of the third means, residual strain during punching is less likely to occur between the circular holes.

Further, according to the second means, in addition to the function of the first means, the connecting portion for connecting the two pipe portions is formed into a flat plate shape, so that the connecting portion with the through hole has a linear shape. Since parts can be provided, brazing and the like can be easily performed.

Further, according to the fourth means, the guide pipe can be formed by integral molding, so that the formation can be performed very easily. According to the fifth means, in the two-cylinder type fluid compressor, only one through hole can be provided in the case, unlike the conventional case where two through holes are provided close to the case. It is possible to eliminate the residual strain at the time of punching that has occurred in the above. Also, since it is not necessary to braze the guide pipe to the case,
The case will not crack due to heating during brazing. Further, as in the sixth means, the guide pipe is fixed to the closing plate via the auxiliary member, so that the heat generated during brazing is applied between the two through holes provided in the closing plate. No cracks will occur.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. First, a first embodiment will be described. FIG.
Is an overall configuration diagram showing a fluid compressor of the present invention,
Since the basic structure is the same as that of the fluid compressor shown in the conventional example, the same reference numerals are given and the description thereof will be omitted, and only the holding structure (shown by A in the figure) of the suction pipe 7 which is a main part will be omitted. Will be explained.

That is, the holding structure A of the suction pipe 7 of this embodiment is the guide pipe 1 for holding the above-mentioned two suction pipes 7.
5 and a through hole 16 provided in the case 1 and through which the guide pipe 15 is inserted and fixed.

Unlike the conventional example, the guide pipe 15 holds the two suction pipes 7 with one component, and as shown in FIG. 1, holds the two suction pipes 2 respectively. Two pipe parts 17a and 17b and two pipe parts 17
and a connecting portion 18 that connects a and 17b. That is, as shown in FIG. 2A, the two pipe parts 17a,
17b each have a cylindrical shape, and the connecting portion 18 has the above-mentioned 2
It is formed in a flat plate shape that connects the two tube portions 17a and 17b. The guide pipe 15 is integrally formed by forging or extrusion molding.

On the other hand, the through-hole 16 has two compression cylinders 2 (compression parts) of the compression mechanism 3 as shown in FIG.
2 (a), the tubular pipe portions 17a, 17 of the guide pipe 15 are provided at positions opposite to each other.
It is composed of two circular hole portions 19a and 19b through which b is passed, and a connecting hole portion 20 which connects the two circular hole portions 19a and 19b and through which the flat plate-like connecting portion 18 is passed. The through hole 16 is integrally formed by punching, for example.

The guide pipe 15 is fixed before the compression mechanism 3 and the electric motor 4 are assembled in the case 1.
First, the guide pipe 15 is passed through the through hole 16, and as shown in FIG. 1, most of the guide pipe 15 is held in a state of being extended to the outside of the case 1.

Next, the guide pipe 15 and the case 1
A brazing material is supplied to the joint portion between and, and both are fixed by brazing as shown in FIG. If the guide pipe 15 is fixed to the case 1, the electric motor 2 is inserted in the case 1.
Then, the compression mechanism 3 is assembled, and finally the suction pipe 7 is inserted into the case 1 through the guide pipe 15. When the tip end of the suction pipe 7 is connected to the compression mechanism 3, the guide pipe 15 and the suction pipe 7 are fixed by brazing. This completes the fluid compressor.
The guide pipe 15 and the suction pipe 7 are brazed as follows.
This is done at the tip of the guide pipe 15.

With such a configuration, the effects described below can be obtained. First, the through hole 16 for holding the guide pipe 15 is formed into two circular through hole portions 19
Since the holes a and 19b are connected by the connecting hole 20, they are left in the case 1 as compared with the case where the two through holes 10 are punched in close proximity as in the conventional example shown in FIG. Less distortion and deformation. Therefore, the case 1 is less likely to be cracked due to thermal stress when the guide pipe 15 is brazed.

Secondly, since the case 1 is not cracked, the space between the two suction pipes 7 can be made smaller (narrower), and the compression mechanism 3 and the case 1 can be made compact. You can Therefore, the degree of freedom in designing the fluid compressor is improved.

Thirdly, since the guide pipe 15 is a single component, there is an effect that the guide pipe can be attached reliably and easily as compared with the conventional example. That is, 2
The gap between the two through holes was narrow, and it was difficult to braze the portion located in this gap. For this reason, brazing cannot be performed completely, and there is a risk that refrigerant may leak or crack from this portion.

However, in this embodiment, since such a portion does not exist, brazing can be reliably performed.
Also, since the connecting portion 18 is flat, brazing is very easy.

Further, since the guide pipe 15 is integrally formed unlike the conventional example, there is an effect that positioning and holding during brazing are very easy. Fourth,
The guide pipe 15 can be formed by welding the pipe portions 17a and 17b and the connecting portion 18, but if formed as an integrally formed product by extrusion molding, it is more inexpensive to produce. .

Next, a second embodiment of the present invention will be described with reference to FIG. Since the basic structure of the fluid compressor is the same as that of the first embodiment, its illustration and description are omitted.

In the first embodiment, the through hole 16 for holding the guide pipe 15 was provided in the case 1, but in this embodiment, as shown in FIG.
Holding plate 22 provided separately from (a closing plate of the present invention)
It is designed to be installed in.

The holding plate 22 is, for example, a steel plate member having an oval shape, and the holding plate 22 has two through holes 2.
3 are provided in parallel. An auxiliary member 24 is inserted into each through hole 23. The auxiliary member 24 is, for example, a short pipe-shaped member made of steel, and a portion projecting inside the case is folded outward and is crimped to the holding plate 22. The auxiliary member 24 and the holding plate 22 are fixed by, for example, electric welding.

When each auxiliary member 24 is fixed to the holding plate 22, two guide pipes shown by 25 in the figure are fixed to the holding plate 22. This guide pipe 25
Unlike the above-mentioned one embodiment, they are independent and are inserted into the auxiliary member 24 and fixed by brazing.

After the guide pipe 25 is fixed to the holding plate 22, the holding plate 22 is attached to the case 1. On the case side, a through hole 26 having a size slightly smaller than the outer shape of the holding plate 22 is provided at a position facing the compression mechanism 3 (shown by a chain line in the drawing). The holding plate 22 is attached so as to close the through hole 26. The holding plate 22 and the case 1 are fixed to each other by electric welding because they are made of steel.

In this way, the holding plate 22 is attached to the case 1.
Once fixed, the compression mechanism 3 and the electric motor 4 are provided in the case 1. Finally, the suction pipe 7 is inserted into the case 1 through the guide pipe 25 and connected to each compression cylinder 2 of the compression mechanism 3 to complete the fluid compressor.

According to this structure, the conventional case has two
Since the through holes 10 for the guide pipes, which are provided close to each other, can be integrated into one, it is possible to eliminate the problem that has occurred in the conventional example as in the first embodiment. Further, when fixing the guide pipe 25 to the holding plate 22, instead of directly joining the two, the auxiliary member 2
It was done through 4. Therefore, the brazing of the guide pipe 25 is less likely to damage the holding plate 22. Furthermore, since the holding plate 22 is provided separately from the case 1, there is an effect that the auxiliary member 24 can be fixed very easily.

The present invention is not limited to the above-mentioned embodiment, but can be variously modified without departing from the spirit of the invention. For example, in the first embodiment, the guide pipe 15 is a substantially gourd obtained by connecting the tubular pipe portions 17a and 17b with the connecting portion 18 having a width smaller than the outer shape of the pipe portions 17a and 17b. Although it has a shape, it is not limited to this. For example, the width of the connecting portion 18 is formed to be substantially equal to the outer shape of the pipe portion 17a,
The outer shape of the guide pipe 15 may be formed into a substantially oval shape.

[0039]

According to such a structure, since the two through holes for the guide pipe, which have been provided in close proximity to the case of the related art, can be unified, the residual strain occurring in the case can be reduced. Therefore, it is possible to effectively prevent the case from cracking when the guide pipe is brazed. Further, since the guide pipe is configured such that the two pipe portions are connected by the flat plate-shaped connecting portion, there is an effect that the case can be easily brazed to the case.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a perspective view showing a process of assembling the guide pipe.

FIG. 3 is likewise a longitudinal sectional view showing the assembly of the second embodiment.

FIG. 4 is a schematic configuration diagram showing a conventional example.

FIG. 5 is a perspective view showing a process of assembling the guide pipe.

[Explanation of symbols]

1 ... Case, 2 ... Compression cylinder (compression part), 3 ... Compression mechanism, 7 ... Suction pipe, 15 ... Guide pipe, 16 ... Through hole, 17a ... Pipe part, 17b ... Pipe part, 18 ... Connection part.

Claims (6)

[Claims] 1. A closed case, a compression mechanism provided in the closed case and having two compression parts, a through hole provided in the closed case, a through hole provided through the through hole, and fixed to the case. A guide pipe, and a suction pipe fixed to the guide pipe, which is inserted into the case through the guide pipe and connected to the compression portion of the compression mechanism. It is composed of two pipe portions respectively holding two suction pipes and a connecting portion connecting the two pipe portions, and the through hole has a shape through which the pipe portion and the connecting portion of the guide pipe pass. And a fluid compressor. 2. The fluid compressor according to claim 1, wherein the pipe portion of the guide pipe has a tubular shape, and the connecting portion has a flat plate shape for connecting the tubular pipe portions. Characteristic fluid compressor. 3. The fluid compressor according to claim 2, wherein the through hole connects the circular hole portion through which the tubular pipe portion of the guide pipe is inserted and the circular hole portions, and the flat plate of the guide pipe. A fluid compressor, comprising: a connection hole portion through which a connection portion having a rectangular shape is inserted. 4. The fluid compressor according to claim 2, wherein the guide pipe is integrally formed by forging or extrusion molding. 5. A closed case, a compression mechanism provided in the closed case and having two compression parts, a through hole provided at a position of the closed case facing the compression mechanism, and a through hole formed in the closed case. A closing plate fixed to the case in a closed state, two through holes provided in the closing plate, and two guide pipes provided through the two through holes and fixed to the closing plate, A fluid compressor comprising: a suction pipe fixed to the guide pipe while being inserted into the case through the guide pipes and connected to the compression units of the compression mechanism. 6. The fluid compressor according to claim 5, wherein the guide pipe is fixed to the closing plate via an auxiliary member provided in a through hole.