JPH09112752A - Piping structure of fluid flowing-in/out container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of parts and cost of a pipe joint structure of a fluid flowing-in/out container for a gas-liquid separator, etc., and to improve generation of flux caused by brazing, and internal contamination. SOLUTION: This container comprises a container main body 1 from which fluid flows in and out, and fluid introducing-in/out pipes 2, 3 penetrating through a wall part 4 of the container main body and extending to the inside and outside. In this case, the fluid introducing-in/out pipes 2, 3 are formed from two pairs of copper container external pipes 22, 32 connected to each other and steel container internal pipes 21, 31, the connecting parts 21a, 31a of the container internal pipes 21, 31 with the container external pipes 22, 32 are flaredly processed into a sleeve state so as to engagingly connect one ends of the container external pipes 22, 32 thereto, and at the same time the flare processing parts 21a, 31a, are weldedly joined and fixed to the wall part 4 of the container main body 1.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a piping structure of a fluid inlet / outlet container such as a gas-liquid separator.

[0002]

2. Description of the Related Art For example, in a refrigerating device such as an air conditioner,
Various fluid inlet / outlet containers such as a gas-liquid separator, an oil separator, a receiver, and a modulator are used.

As an example of the fluid inlet / outlet container, for example, a piping structure in a conventional embodiment of a gas-liquid separator is shown in FIG.
6 to FIG.

First of all, in FIGS. 4 to 6, reference numeral 1 is a container body of a steel tube-shaped gas-liquid separator which is vertically elongated.
Reference numeral 41 is a gas-liquid mixed refrigerant introduction pipe, and 51 is a gas refrigerant discharge pipe.

The container body 1 of the gas-liquid separator is constructed by making the openings of the bowl-shaped container units 1A and 1B face each other and integrally fitting and joining them, and the upper ceiling wall thereof. Pipe fitting holes are formed in the parts 4,
A gas-liquid mixed refrigerant introduction pipe 41 and a gas refrigerant outlet pipe 51 are fixed in parallel with each other through the fitting hole from the inside to the outside as shown in FIG.
Flare processing parts 40 and 50 for connection with external piping are provided on the 1a side.
Are formed.

The gas-liquid mixed refrigerant introducing pipe 41 penetrates through the ceiling wall portion 4 of the container body 1 of the gas-liquid separator, and through the socket 45 in the upper space 10 in the container body 1 of the gas-liquid separator. It is inserted in a substantially straight manner, the end 41b is opened, and the socket 45 is fixed to the container body 1. The gas-liquid mixed refrigerant introducing pipe 41 is entirely made of copper, while the socket 45 is made of steel corresponding to the container body 1.

The fixing at the socket 45 portion is carried out by first connecting the gas-liquid mixed refrigerant introducing pipe 41 made of copper, which is made by brazing the steel socket 45 to brass (BCuZn), to the container body 1 of the steel gas-liquid separator. Is inserted into the fitting hole portion of the ceiling wall portion 4 from the lower side toward the upper side, and the socket 45 portion is fixed by carbon dioxide gas (CO ₂ ) welding as indicated by reference numeral 6.

Further, the gas refrigerant outlet pipe 51 penetrates the fitting hole of the ceiling wall portion 4 of the gas-liquid separator 1 and has a socket 55 brazed with brass as in the case of the gas-liquid mixed refrigerant inlet pipe 41. Through the bottom of the container main body 1 of the gas-liquid separator substantially straight, and then bent upward again in a U shape,
Further, it extends upward, and its tip portion 51b is opened at a position higher than the tip portion 41b of the gas-liquid mixed refrigerant introducing pipe 41. The gas refrigerant outlet pipe 51
Is entirely made of copper, while the socket 55 is made of the same steel as the container body 1.

Then, the socket 55 portion is carbon dioxide welded to the fitting hole portion of the ceiling wall portion 4 of the gas-liquid separator 1 as indicated by reference numeral 6 as in the case of the gas-liquid mixed refrigerant introducing pipe 41. It is fixed.

[0010]

As described above, the copper pipe is generally used as the fluid introduction / extraction pipe of the conventional fluid inlet / outlet container such as the gas-liquid separator from the viewpoint of easiness of processing. On the other hand, as for joining and fixing to the container body, as described above, it is welded and joined by carbon dioxide welding through the socket made of the same steel material as the container, or directly on the outside of the fitting hole on the container body side by burring. It is realized by attaching silver brazing.

However, when a separate steel socket is used as in the former configuration, there is a problem that the number of parts and the number of working steps increase correspondingly, resulting in an increase in cost.

On the other hand, in the latter case in which burring is performed and silver brazing is directly performed, first, in the case where the pipe ends are flared and bent as in the above pipes, the fitting on the container body side is performed. Due to the relationship with the diameter of the dowel hole, there is a problem that the hole diameter is too large to be joined as it is, and further forming processing after fitting and the like is required.

Further, in that case, unlike the former case, in which a steel socket is brazed to a copper tube by brass brazing and the flux is removed by pickling, and then the socket is welded to the container body,
Since the silver brazed portion between the copper tube and the container body cannot be pickled and the flux cannot be removed, there is a problem of internal contamination due to the residual flux.

The present invention has been made in order to solve such a problem, and uses two sets of pipes, a copper outer pipe and a steel inner pipe, which are connected to each other by fluid inlet and outlet pipes. To form a sleeve, and to flare the joint between the inner pipe and the outer pipe into a sleeve to fit and connect with the outer pipe, and to fix the flared portion made of steel by welding and fixing to the container body. By doing so, it is an object of the present invention to provide a piping structure for a fluid inlet / outlet container that is low in cost and does not cause the problem of internal contamination due to residual flux during joining.

[0015]

Means for Solving the Problems In order to achieve the above object, the present invention is provided with the following means for solving the problems.

That is, the piping structure of the fluid inlet / outlet container of the present invention, as shown in, for example, FIGS. 1 to 3, penetrates a steel container main body 1 through which a fluid flows in and out, and a wall portion 4 of the container main body 1. In a fluid inlet / outlet container consisting of fluid introduction / extraction pipes 2 and 3 extending inward and outward, the fluid introduction / extraction pipes 2 and 3 are connected to each other by copper external pipes 22 and 32 and steel internal pipes 21. , 31 and the outside pipes 22, 3 of the inside pipes 21, 31 of the inside pipes 21, 31 are flared to form sleeves.
The one end of 2 is fitted and connected, and the flare processing portion 21
a and 31a are welded and fixed to the wall portion 4 of the container body 1.

Further, in this case, the connecting portions between the container outside pipes 22 and 32 and the container inside pipes 21 and 31 are connected by brass brazing.

Therefore, in this configuration, at least the in-container pipes 21 and 31 of the fluid introduction / exhaust pipes 2 and 3 which are conventionally made of copper are formed of steel, which is considerably lower in cost than copper. Therefore, the cost can be reduced accordingly. On the other hand, the outside-container pipes 22 and 32 that need to be connected to the outside pipe are made of copper, and the easiness of processing can be maintained as they are.

Moreover, the pipe 2 inside the container is nevertheless used.
The flux of the brazed portion between the pipes 1, 31 and the outside-container pipes 22, 32 can be reliably removed by pickling in the pipe alone state before welding to the container body, and the wall portion 4 of the container body 1 can be further removed. Since the fixed part to be joined to and can be made of steel as usual, and a normal welding structure that does not require flux can be adopted, contamination at any part due to internal flux as in the conventional case The problem of occurrence does not occur.

Moreover, even if there is a flare processing portion for connection with the external piping at the outer end of the fluid introduction / delivery piping, it can be fitted and fitted without any problem, and can be joined to the container body without forming processing or the like. You can

[0021]

As a result of the above, according to the piping structure of the fluid inlet / outlet container of the present invention, it is possible to replace a considerable amount of the fluid piping with a low-cost material from copper to steel, and the socket portion becomes unnecessary, and the number of parts is increased. Assembling man-hours are also reduced, and a considerable cost reduction is realized. In addition, separate collection becomes easy.

[0022]

1 to 3 show a piping structure of a fluid inlet / outlet container according to an embodiment of the present invention.

First, FIGS. 1 and 2 show the overall structure of a fluid inlet / outlet container such as a gas-liquid separator which is used, for example, provided between the evaporator outlet side and the compressor inlet side of a refrigeration circuit of an air conditioner. Reference numeral 1 denotes a tube-shaped container body of a gas-liquid separator which is elongated in the vertical direction, 2 denotes a gas-liquid mixed refrigerant introduction pipe, and 3 denotes a gas refrigerant discharge pipe.

The container body 1 of the gas-liquid separator is constructed by integrally fitting and joining the opening sides of the bowl-shaped steel container units 1A and 1B so as to face each other. As shown in the drawing, a gas-liquid mixed refrigerant introduction pipe 2 and a gas refrigerant discharge pipe 3 are inserted from the upper side so as to penetrate therethrough.

The gas-liquid mixed refrigerant introduction pipe 2 is slightly inserted after being inserted almost straight from the ceiling wall portion 4 of the container body 1 of the gas-liquid separator into the space above the container body 1 of the gas-liquid separator. A pipe 21 in a container whose end 21b is opened by bending sideways, and a large-diameter flare processing portion 21a of the pipe 21 in the container.
2 with the container outside piping 22 one end side of which is fitted and connected via
It is made up of book pipes. Unlike the conventional one, the in-container pipe 21 is made of steel, while the outside-container pipe 22 is made of copper, like the conventional one.

The flared portion 21a is fitted and fixed to the fitting hole portion of the ceiling wall portion 4 of the container body 1 of the gas-liquid separator by welding. Reference numeral 6a indicates the weld bead portion.

Further, the gas refrigerant outlet pipe 3 is once inserted from the ceiling wall portion 4 of the container body 1 of the gas-liquid separator into the inner bottom portion of the container body 1 of the gas-liquid separator substantially straight, and then bent into a U shape. And is extended upward again, and the tip 31b thereof is provided with the tip 21b of the in-container pipe 21 of the gas-liquid mixing introduction pipe 2.
It is composed of two pipes, an in-container pipe 31 opened to an upper space above and an outside-container pipe 32 fitted and connected at one end through a large-diameter flare processing part 31a of the in-container pipe 31. There is. The inner pipe 31 is made of steel, which is cheaper than the conventional one, while the outer pipe 32 is made of copper, which is the same as the conventional pipe.

Then, the large-diameter flared portion 31a is fitted and fixed to the fitting hole portion of the ceiling wall portion 4 of the container body 1 of the gas-liquid separator by welding. Reference numeral 6b indicates the weld bead portion.

Then, flare processing parts 21a and 31a of the above-mentioned container inner pipes 21 and 31 and container outer pipes 22 and 32, respectively.
The joining is performed by, for example, brass brazing.

Further, flare processing portions 22 for connecting external pipes, which are the same as conventional ones, are provided on the upper ends of the external pipes 22, 32.
a, 32a are formed.

Therefore, in the above structure, at least the in-container pipes 21 and 31 of the gas-liquid mixed refrigerant introduction pipe 2 and the gas refrigerant discharge pipe 3 which are conventionally made entirely of copper are
It can be formed of steel, which is considerably lower in cost than copper, and the cost can be reduced accordingly. In particular, in the case of the gas refrigerant outlet pipe 3, the effect is remarkable because the length of the pipe 31 inside the container is long.

Moreover, the container piping 2 is nevertheless used.
The flux of the brass brazed portions between the pipes 1, 31 and the pipes 22, 32 outside the container can be reliably removed by pickling in the pipe alone state before welding to the container body 1, and further, the wall of the container body 1 The flared parts 21a and 31a, which are the joining and fixing parts to the part 4, can be formed of steel as usual,
Since a normal welding structure that does not require flux can be adopted, the problem of contamination occurrence due to the residual internal flux does not occur in any portion, unlike in the case of conventional brazing.

Moreover, since the external pipes 22 and 32 are made of copper and can be brazed with copper without using flux with the external pipe made of copper, there is no problem of internal contamination due to the flux at the time of connection. Further, at the same time, the processing is easy, so there is no hindrance to the connection work with the external pipe.

As a result, according to the piping structure of the fluid inlet / outlet container according to the embodiment of the present invention, a considerable amount of the fluid piping can be replaced with low cost material from copper to steel, and the socket portion is unnecessary. Therefore, the number of parts and the number of assembling steps are reduced, and a considerable cost reduction is realized. Also,
The problem of internal contamination due to the inclusion of flux can be reliably solved.

[Brief description of the drawings]

FIG. 1 is a sectional view of an entire fluid inlet / outlet container portion showing a piping structure of a fluid inlet / outlet container according to a first embodiment of the present invention.

FIG. 2 is a plan view of the container section.

FIG. 3 is an enlarged cross-sectional view showing a structure of a joint portion with a pipe of the container.

FIG. 4 is a cross-sectional view of the entire fluid inlet / outlet container portion showing a piping structure of a fluid inlet / outlet container according to a conventional embodiment.

FIG. 5 is a plan view of the container section.

FIG. 6 is an enlarged cross-sectional view showing a structure of a joint portion with the pipe of the container.

[Explanation of symbols]

Reference numeral 1 is a container body of a gas-liquid separator, 2 is a gas-liquid mixed refrigerant introduction pipe, 3 is a gas refrigerant discharge pipe, 4 is a ceiling wall portion, 6 is a weld bead portion, 21 is a gas-liquid mixed refrigerant introduction pipe in the container pipe Two
Reference numeral 1a is a flare processing portion of the container inner pipe, 22 is an outer container piping, 31 is a container refrigerant piping of a gas refrigerant outlet pipe, 31a is a flare processing portion of the same container piping, and 32 is an outer container piping.

Claims (3)

[Claims] 1. A container body (1) made of steel into and out of which a fluid flows.
And a fluid inlet / outlet pipe (2), (3) penetrating the wall portion (4) of the container body (1) and extending inward and outward, in the fluid inlet / outlet pipe (2), (3). 3)
Are connected to each other by external copper pipes (22), (3
2) and the steel pipes (21) and (31) in the container.
1) The outside pipes (22) and (32) of the outside of the container pipes (22) and (32) are flared to form a sleeve.
One end of the flare is fitted and connected, and the flared portion (21
A piping structure for a fluid inlet / outlet container, wherein a) and (31a) are welded and fixed to a wall portion (4) of the container body (1). 2. The outside pipes (22) and (32) of the outside of the container have flare processing parts (22) for connecting external pipes, respectively.
The piping structure for a fluid inlet / outlet container according to claim 1, characterized in that it has a) and (32a). 3. The fluid according to claim 1 or 2, characterized in that brass brazing is applied to a connecting portion between the outer pipes (22), (32) of the container and the inner pipes (21), (31) of the container. Piping structure for access containers.