JP2002107009A - Filter-holding structure of receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve operability of fitting and the stability of brazing of a filter holding member to a receiver. SOLUTION: A condensed refrigerant flowing from a condenser through refrigerant inlet piping 29 is stored temporarily in a receiver 27, so that it can be supplied to an evaporator, in conformity with a refrigeration load. A vapor-liquid separating chamber 41 is formed inside the receiver 27 and a collar 39 retaining a filter 37 is pressed in and fixed to the lower part of the vapor- liquid separating chamber 41. The collar 39 has a press-in part 67 formed on the rear end side in the direction of pressing in and a tapering part 69 formed in the upper end of the press-in part 67. The outside diameter of an upper end part 73 on the fore end side in the direction of pressing in of the collar 39 is so set that this part is not pressed in the receiver 27 and forms a minute space, and this minute space makes a puddle for brazing, while a space between the tapering part 69 and the inner peripheral surface of the receiver 27 is forms also the puddle and brazing is carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter for a liquid receiver, in which a filter for passing the refrigerant and flowing out of the liquid receiver is provided below a liquid receiver for storing the refrigerant flowing out of the condenser. Regarding the holding structure.

[0002]

2. Description of the Related Art FIG. 4 shows a condenser 1 in a vehicle air conditioner.
FIG. 3 is a perspective view of a liquid receiver 3. In the condenser 1,
A high-temperature and high-pressure gas refrigerant compressed by a compressor (not shown)
The refrigerant flows into the condenser 7 from the refrigerant inlet 5 and exchanges heat with the outdoor air to condense and liquefy, and the refrigerant flowing from the receiver 3 to the supercooling unit 9 exchanges heat with the outdoor air and is subcooled. Thereafter, the refrigerant flows out from the refrigerant outlet 11 toward an expansion valve and an evaporator (not shown). The gas refrigerant evaporated by the evaporator returns to the compressor and is compressed to form a refrigeration cycle.

The liquid receiver 3 temporarily stores condensed refrigerant flowing from the condensing section 7 of the condenser 1 through the refrigerant inlet pipe 13 so that the condensed refrigerant can be supplied to the evaporator in response to a refrigeration load. Then, the inflow gas-liquid two-phase refrigerant is gas-liquid separated into a gas refrigerant and a liquid refrigerant, and only the liquid refrigerant is supplied to the supercooling unit 9 via the refrigerant outlet pipe 15.

FIG. 5 is a sectional view of the liquid receiver 3 in the vicinity where the refrigerant inlet pipe 13 and the refrigerant outlet pipe 15 are connected.
A filter 17 for removing foreign matters such as dust and metal powder generated in the refrigeration cycle is accommodated in a lower end portion of the liquid receiver 3. That is, the refrigerant flowing from the condensing section 7 into the gas-liquid separation chamber 19 in the receiver 3 through the refrigerant inlet pipe 13 is filtered through the lower filter 17 and then passed through the refrigerant outlet pipe 15. It flows out to the supercooling section 9.

The filter 17 is held in a filter holding member 21, and the filter holding member 21 is press-fitted and fixed from a lower end opening of the cylindrical liquid receiver 3. The filter holding member 21 is provided on the outer periphery of the flanges 23 and 25 formed at the front end and the rear end in the press-fitting direction, respectively.
a, 25a are formed, and are press-fitted and fixed at these two locations. In addition, a brazing material is applied to the press-fitting portions 23a and 25a and the periphery thereof before the press-fitting operation, and is put into a heating furnace after the press-fitting, and the periphery of the press-fitting portions is brazed to prevent leakage of the refrigerant.

[0006]

However, in the above-mentioned conventional structure, the press-fitting portions 23a and 25a are provided at two positions on the front end side and the rear end side in the press-fitting direction. The moving distance by press-fitting from the lower end opening is long, which causes the liquid receiver 3 to be deformed and deteriorates the quality. When the press-fitting portion 25a on the rear end side is press-fitted, the press-fitting portion 23a on the front end side is used. The press-fitting is performed after the press-fitting, so that reliable press-fitting cannot be performed, and there is a possibility that a liquid leak may occur. In addition, the parts to be brazed are each flange 23,
The corners A and B at the upper end of 25 are formed, but since the corners A and B are simply brazed by spotting, the brazing stability is insufficient.

It is an object of the present invention to improve the workability of assembling a filter holding member to a receiver and the stability of brazing.

[0008]

In order to achieve the above object, the invention according to claim 1 is directed to a receiver for storing the refrigerant flowing out of the condenser and passing the refrigerant to a lower part of the receiver. In a filter holding structure of a liquid receiver provided with a filter that flows out to the outside, a cylindrical filter holding member that is press-fitted into a lower end opening of the liquid receiver and holds the filter inside is provided. Is provided with a press-fitting portion for the inner surface of the liquid receiver at the rear end side in the press-fitting direction.

According to the filter holding structure having such a configuration, the filter holding member is inserted from the lower end opening of the receiver, and the press-fitting portion provided on the rear end side in the insertion direction is press-fitted into the inner surface of the receiver. Is done.

According to a second aspect of the present invention, in the configuration of the first aspect, the filter holding member has at least a front end side in the press-fitting direction having a minute gap in which a brazing material by brazing is interposed with respect to the inner surface of the receiver. The outer diameter dimension on the tip side in the press-fitting direction is set so as to form.

According to the above configuration, at the time of press-fitting operation, the filter holding member moves with the front end side in the press-fitting direction being in contact with the inner surface of the receiver or holding a small gap,
When the rear end reaches the receiver, press-fitting into the inner surface of the receiver is performed, and after press-fitting, the front end side in the press-fitting direction forms a minute gap with the inner surface of the receiver, and the brazing material fills the minute gap. And the brazing stability of this portion is improved.

According to a third aspect of the present invention, in the configuration of the second aspect, a space formed between the inner surface of the liquid receiver and the filter holding member is provided on the front end side of the press-fitting portion in the press-fitting direction. Brazing material is provided in the space by brazing.

According to the above construction, the space in which the brazing material is provided becomes a brazing pool, and the brazing stability at this portion is improved.

According to a fourth aspect of the present invention, in the configuration of the third aspect, the space is formed between the tapered portion formed at the end of the press-fitting portion and the inner surface of the liquid receiver.

[0015] According to the above configuration, a wax pool is formed between the tapered portion and the inner surface of the liquid receiver.

[0016]

According to the first aspect of the present invention, since the filter holding member is provided with the press-fitting portion with respect to the inner surface of the receiver at the rear end side in the press-fitting direction, the press-fitting range is narrowed and the deformation of the receiver is reduced. Can be suppressed, and assembling workability is improved.

According to the second aspect of the present invention, the filter holding member is press-fitted so that at least the tip end side in the press-fitting direction forms a minute gap through which the brazing material is interposed with the inner surface of the receiver. The outer diameter dimension at the leading end in the direction is set, so the brazing stability between the leading end in the press-fitting direction of the filter holding member and the inner surface of the receiver can be improved, and leakage of the refrigerant is reliably prevented. can do.

According to the third aspect of the present invention, a space formed between the inner surface of the liquid receiver and the filter holding member is provided on the front end side of the press-fitting portion in the press-fitting direction, and the brazing material is brazed to this space. Is provided, the brazing stability of this portion can be improved, and leakage of the refrigerant can be reliably prevented.

According to the fourth aspect of the present invention, the space between the tapered portion formed at the end of the press-fitting portion and the inner surface of the receiver becomes a pool, so that the brazing stability at this portion is improved. Thus, leakage of the refrigerant can be reliably prevented.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a liquid receiver 27 applied to a vehicle air conditioner. In the liquid receiver 27, a refrigerant inlet pipe 29 and a refrigerant outlet pipe 31 connected to a lower end are illustrated in the same manner as a conventional one. Not connected to the condenser.

In the liquid receiver 27, the upper end opening of a cylindrical liquid receiver main body 33 is closed by a lid 35, and a filter 37 for removing dust and metal powder in the refrigeration cycle is held in the lower end opening. Collar 39 as a filter holding member
Is press-fitted by a method described later.

The inside of the liquid receiver 27 above the collar 39 is a gas-liquid separation chamber 41 for separating the condensed refrigerant sent from the condenser into gas and liquid. In the gas-liquid separation chamber 41, the refrigerant inlet pipe 29 is provided. Communicating. The gas-liquid separation chamber 41 has a dryer 4 made of a desiccant for removing moisture contained in the refrigerant.
3 are accommodated. A communication hole 45 is formed at one side of the periphery of the collar 39, and the communication hole 45 and the refrigerant outlet pipe 31 are formed.
And are in communication. That is, the refrigerant that has flowed into the gas-liquid separation chamber 41 through the refrigerant inlet pipe 29 from the condensation section of the condenser (not shown) is separated into gas and liquid, and then the liquid refrigerant is filtered through the filter 37 to be filtered. Refrigerant outlet pipe 31
Through the supercooling section of the condenser.

The collar 39 has an upper portion opened at an opening 47 and a lower portion also opened at an opening 49. A cap 51 is fitted into the lower opening 49. The cap 51 has a flange 51 a formed at the lower end, and the flange 51 a
C-ring 55 is in contact with opening 49 from below.
And is held by the collar 39. An O-ring 57 is fitted as a sealing material in the groove 51b on the outer periphery of the cap 51.

In the filter 37, a projection 59 projecting outward at the upper peripheral edge is formed on the inner step 6 of the opening 47 of the collar 39.
1 and a positioning projection 63 for determining the center position with the cap 51 is formed at the lower end. That is, when the cap 51 is inserted into the collar 39, the positioning protrusion 63 of the filter 37 is inserted into the positioning recess 51c provided in the cap 51.

The collar 39 has an outer step 65 formed on the outer periphery of the lower end, and the outer step 65 is fixed to the receiver main body 33 in a state where the outer step 65 is in contact with the lower end of the receiver main body 33 from below. . In the collar 39, a press-fit portion 67 for the liquid receiver main body 33 is formed over the entire outer periphery of the outer step portion 65. That is, the press-fitting portion 67 is located on the rear end side in the press-fitting direction of the collar 39 into the receiver main body 33. At the front end in the press-fitting direction of the press-fitting portion 67, a tapered portion 69 is formed over the entire circumference as shown in an enlarged view of a main part in FIG. By providing the tapered portion 69, the collar 3
A space 71 serving as a pool is formed between the inner surface of the receiver 9 and the inner surface of the receiver main body 33, while the upper end 73 of the collar 39 on the front end side in the direction of press-fitting the receiver main body 33 into the receiver 39 is formed. The outer diameter is set so as to form a minute gap that becomes a pool for the inner peripheral surface of the liquid container main body 33. Specifically, assuming that the outer diameter of the upper end portion 73 is C and the inner diameter of the liquid receiver main body 33 is D, the relationship is 0 <(D−C) <0.3 mm.

The press-fit portion 67 and the upper end 7 of the collar 39
A gap 75 is formed between the liquid receiving device 3 and the receiver main body 33 as a concave portion.

When the collar 39 is press-fitted from the lower opening 49 of the receiver main body 33, the filter 37 is not held, and in this state, the periphery of the press-fitting portion 67 and the corresponding receiver main body 33 At least one of the inner periphery and the periphery of the upper end portion 73 and the corresponding liquid receiver main body 33
A brazing material for brazing is provided on at least one of the inner periphery and the periphery.

In this state, when the collar 39 is inserted from the opening 49 of the receiver main body 33 with the upper end 73 as the front end side in the press-fitting direction, the upper end 73 slides while being guided by the inner peripheral surface of the receiver main body 33. It moves into the receiver main body 33. In this insertion process, the press-fitting portion 67 starts to enter the liquid receiver main body 33 to perform press-fitting, and the collar 39 is attached to the liquid receiver main body 3.
3 will be fixed. At this time, the color 39 is
Since the outer peripheral surface of the upper end 73 is almost in contact with the inner peripheral surface of the liquid receiver main body 33, the state becomes stable with respect to the liquid receiver main body 33. When press-fitting the press-fitting portion 67, the press-fitting start operation is facilitated by the tapered portion 69 serving as a guide.

In the above press-fitting operation, the press-fitting portion 67 is formed only on the rear end side of the collar 39 in the press-fitting direction, and the press-fitting portion is not provided on the front end side. The press-fitting range becomes narrower, the deformation of the liquid receiver main body 33 can be suppressed, the quality can be improved, and the press-fitting operation becomes extremely easy.

After completion of the press-fitting operation, the liquid receiver main body 33 into which the collar 39 is press-fitted is put into a heating furnace (not shown) so that the brazing material provided is melted. After the melting, the receiver main body 33 into which the collar 39 was press-fitted was taken out of the furnace, and solidified in a minute gap between the upper end portion 73 and the inner peripheral surface of the receiver main body 33 as shown in FIG. A brazing material 77 exists, and as shown in FIG. 2, a solidified brazing material 79 exists in a space 71 above the press-fitting portion 69, and these portions are brazed. As a result, compared to the conventional brazing by spotting, the brazing stability of each part is improved, and the refrigerant in the gas-liquid separation chamber 41 reliably passes through the opening 47 from the filter 37 to the refrigerant outlet pipe. It will flow to 31.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a liquid receiver applied to a vehicle air conditioner according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view around a press-fit portion of a collar holding a filter in the liquid receiver of FIG.

FIG. 3 is a cross-sectional view of the vicinity of an upper end of a collar holding a filter in the receiver of FIG. 1;

FIG. 4 is a perspective view of a condenser and a liquid receiver in the vehicle air conditioner.

FIG. 5 is a sectional view showing a filter holding structure of a liquid receiver according to a conventional example.

[Explanation of symbols]

 27 Liquid receiver 37 Filter 39 Collar (filter holding member) 67 Press-fit portion 69 Taper portion 71 Space 73 Upper end (front end side in press-fit direction) 77, 79 brazing material

Claims (4)

[Claims] 1. A filter holding structure for a liquid receiver, wherein a filter 37 for passing the refrigerant and flowing out of the liquid receiver 27 is provided below the liquid receiver 27 for storing the refrigerant flowing out of the condenser. , A cylindrical filter holding member 39 which is press-fitted into the lower end opening of the liquid receiver 27 and holds the filter 37 therein is provided.
Is provided with a press-fit portion 67 for the inner surface of the liquid receiver 27 on the rear end side in the press-fit direction, wherein the filter holding structure of the liquid receiver is characterized in that: 2. The filter holding member 39 has a front end 73 in the press-fitting direction such that at least a front end 73 in the press-fitting direction forms a minute gap with an inner surface of the receiver 27 through which a brazing filler metal is interposed. The filter holding structure for a liquid receiver according to claim 1, wherein an outer diameter dimension of 73 is set. 3. A space 71 formed between the inner surface of the liquid receiver 27 and the filter holding member 39 is provided on the front end side of the press-fitting portion 67 in the press-fitting direction, and a brazing material 79 by brazing is provided in the space 71. The filter holding structure for a liquid receiver according to claim 2, wherein the filter holding structure is provided. 4. The liquid receiving device according to claim 3, wherein the space is formed between a tapered portion formed at an end of the press-fitting portion and an inner surface of the liquid receiving device. Filter holding structure.