JP2000205701A - Silencer for air-conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a silencer for an air-conditioner with a cutting process being eliminated. SOLUTION: In a silencer 1, a cylinder body 3 with a bottom is molded by forging a matrix 2. The cylinder body 3 with a bottom has a recess 4a formed in a bottom 4 of a silencer 1 during forging. A small diameter hole 4b is formed in the central part of the bottom of the recess 4a through punching to form a pipe socket 4c. The cylinder body 3 with a bottom is then fixed by a fixing member 6, and a throttle part 7 is formed through necking processing applied on the opening 5 side. A recess 7c is formed by press processing applied on the inner peripheral part of the throttle part 7 to form a pipe socket 7a. This method brings a silencer 1 into a finished product without a cutting process and the pipe sockets 4c and 7a are joined with a pipe on the air-conditioner side at a subsequent process.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silencer for an air conditioner, which is provided, for example, in an air conditioner and whose basic appearance is formed by forging.

[0002]

2. Description of the Related Art A car air conditioner is provided as an air conditioner of an automobile, and a cooling refrigerant circulates in a refrigeration cycle. In a car air conditioner, during operation of the air conditioner, abnormal noise due to the flow of the refrigerant may be generated, which is specific or unique to the model. As a countermeasure, there are various methods, for example, the amount of the refrigerant is adjusted, and the abnormal pressure is prevented by changing the internal pressure of the refrigeration cycle and the flow rate of the refrigerant. In some cases, a method of attaching a silencer to a refrigeration cycle of an air conditioner may be adopted.

FIG. 6 shows a method of manufacturing a conventional silencer. As shown in the left part of FIG. 6, the silencer 21
A bottomed cylindrical body 22 is formed by forging an aluminum alloy material, and a thick portion 23 is provided at the bottom. Next, the bottomed cylinder 2
The upper part of 2 is necked to form the drawn part 24.
Thereafter, the inner periphery of the constricted portion 24 is cut with a drill or the like to form a pipe port 25, and the thick portion 23 is further cut to form a stepped pipe port 26.

[0004]

As described above, in the conventional silencer manufacturing process, after forging, the length and the total length from the pipe receiving port at the bottom of the silencer to the pipe receiving port at the drawing portion are determined by cutting. Since the forging process for forming the basic shape of the silencer and the cutting process for the pipe receiving port are completely separate processes, the process is time-consuming and requires much processing time and cost. Also, when the pipe opening of the silencer is cut, chips remain inside the silencer, and since the silencer is generally connected to hose fittings arranged before and after the compressor, chips enter the compressor and the liquid tank. Sometimes.

If chips enter the compressor, it causes a shortage of cooling power or damage to the compressor, and clogging of the liquid tank hinders the flow of the refrigerant downstream, causing a shortage of cooling power and completely removing the refrigerant. Must. Also, if there is a burr generated by the cutting, when the refrigerant passes, it may cause flow noise. Furthermore, since the cutting oil is used at the time of the cutting process, it is necessary to dispose of the cutting oil. The present invention has been made in view of the above problems, and has as its object to provide a silencer for an air conditioner that completely eliminates cutting processing, eliminates chips and burrs during cutting, and can be easily manufactured. .

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, a silencer for an air conditioner according to the present invention has a recess in which a pipe for introducing a refrigerant of an air conditioner is fitted and a bottom portion of the recess. A pipe receiving port provided with a small-diameter hole through which the refrigerant flows, and a pipe receiving port having a small-diameter hole provided at the bottom of the concave portion and the concave portion into which the pipe for discharging the refrigerant fits and through which the refrigerant flows. In a silencer for an air conditioner whose basic shape before processing is formed into a bottomed cylindrical shape by forging, a recess is formed in the bottom of the bottomed cylinder during the forging, and the bottom of the recess is formed. The small-diameter hole is pressed out to provide one of the pipe receiving ports, a small-diameter hole is formed by necking on the opening side of the bottomed cylindrical body, and a concave portion is formed by pressing the inner peripheral portion of the small-diameter hole. Other than the above pipe port A is provided.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an air conditioner silencer according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 and FIG. 2 show a silencer 1 for a car air conditioner according to the present invention, and show an appearance before being connected to hoses or pipes on the air conditioner side.
This silencer 1 is formed into a bottomed cylindrical body having a basic appearance by forging, and thereafter, processing of each part is performed.

FIG. 3 shows the manufacturing process. The starting material is a forgeable material, for example, columnar aluminum (A606)
3: JIS material) is used as the base material 2. The diameter D and the height H of the base material 2 are strictly determined. In the present embodiment, since the cutting process is omitted, the material input amount is accurately performed, the tolerance of the entire length is suppressed, and even if the tolerance occurs, the value does not become a problem.

As shown in the left part of FIG. 3, first, a base material 2 is formed into a bottomed cylindrical body 3 by forging. The bottomed cylinder 3 is
Except for the corners, the whole is formed so as to have a constant thickness as much as possible. At that time, a circular recess 4a is formed in the center of the bottom 4 by forging. The diameter of the recess 4a is made substantially equal to the outer diameter of the pipe to be joined in a later step. Next, a small-diameter hole 4b is formed in the center of the bottom of the recess 4a by press punching to form a pipe receiving port 4c having a step. The press punching operation is performed by using the metal plate (die) applied to the flat bottom 4 and the cylindrical body 3.
The cutting is performed by a cutting blade (punch) inserted in the.

Next, the bottomed cylindrical body 3 is fixed by a fixing member 6 and, for example, a drawing die 10 as shown in FIG.
A narrowed portion 7 is formed on the opening side by necking, and an inner peripheral portion of the narrowed portion 7 is formed by pressing with a punch 9 to form a pipe receiving port 7a having a step. That is, the constricted portion 7 is constricted until its inner diameter becomes slightly smaller than the outer diameter of the end of the pipe to be connected in a later step, and the constricted portion 7 is constricted.
b is formed, and then a recess 7c is formed by pressing with a punch 9. The recess 7c substantially matches the outer diameter of the pipe connected to the pipe receiving port 7a. As shown in the enlarged view of the arrow A in FIG. 2, the inner peripheral side of the narrowed portion 7 is provided with a tapered inclined surface 7d to facilitate processing. Thus, the silencer 1 becomes a finished product and is joined to the pipe in the next step.

As described above, the silencer 1 of the present embodiment forms the recess 4a in the bottom 4 when forming the basic shape during forging, and forms the pipe receiving port 4c by pressing in the next step. are doing. Also, the pipe receiving port 7a is formed by pressing after the drawing on the drawn portion 7 side of the silencer 1. In this way, the cutting process is omitted altogether, and the forging process and the pressing process enable the pipe receiving port 4c,
Since 7a can be formed, processing time and cost can be reduced.

An example of using the silencer 1 will be briefly described. As described above, the silencer 1 is used for an air conditioner of an automobile. FIG. 4 shows a part of components of an air conditioner in an engine room of an automobile.
2. It flows to the condenser 13 and the liquid tank 15, enters the cooling unit (not shown) on the indoor side, and flows again to the low-pressure hose 14 on the engine room side. In the present embodiment, the silencer 1 is provided on the low-pressure hose 14,
Prevents refrigerant pulsation noise from the compressor.

In this embodiment, since there is no cutting step, there is no danger that chips generated at the time of cutting the bottomed cylinder are circulated in the refrigeration cycle together with the refrigerant, so that clogging of the liquid tank 15 and the like can be prevented. Therefore, the work to remove chips is reduced and cutting oil is not used.
There is no need to remove it. In addition, since the burrs at the time of cutting are eliminated, it is possible to prevent the generation of the flow noise generated when the refrigerant passes through the burrs.

Although the embodiments of the present invention have been described above, the present invention is, of course, not limited to these, and the dimensions, materials, shapes, relative arrangements, and manufacturing steps of the components are based on the scope of the present invention. It is not intended to be limiting. Hereinafter, an example of a modified example will be described. Silencer 1 shown in FIGS.
Has a bottom pipe 4 provided with the other pipe receiving port 4c, but the silencer 1a shown in FIG.

The manufacturing process of the silencer 1a is basically the same as the manufacturing process of the silencer 1 shown in FIG.
Only the stage of press release differs. That is, after the forging step, the peripheral portion 8 of the silencer 1a is pressed to form a small-diameter hole 8b. At this time, the backing of the cutting tool before drawing can be inserted into the cylinder without any trouble. After the press punching, the periphery of the small-diameter hole 8b is pressed to form a recess 8c to form a pipe port 8a having a step. Thereafter, drawing is performed to form a drawn portion 7, and pressing is performed to form a pipe receiving port 7a. Even with such a molding method, the same effects as those of the above embodiment can be obtained. In the manufacturing process, after the recess 8c is formed, the small-diameter hole 8b may be pressed.

[0016]

The silencer for an air conditioner of the present invention requires no work from the forging to the finished silencer, from the cylinder with the bottom to the finished silencer. The time can be shortened, and the production cost can be reduced. Since there is no cutting, there is no need to remove chips and burrs generated during cutting.

[Brief description of the drawings]

FIG. 1 is a perspective view of a completed product of an air conditioner silencer according to an embodiment of the present invention.

FIG. 2 is a sectional view of a completed product of the air conditioner silencer.

FIG. 3 is a view showing a flow of a manufacturing process of the silencer for an air conditioner from a base material to a finished product.

FIG. 4 is a perspective view showing a usage form of the air conditioner silencer in an automobile.

FIG. 5 is a diagram showing a flow of a manufacturing process of a silencer for an air conditioner according to a modification.

FIG. 6 is a view showing a flow of a manufacturing process of a conventional silencer for an air conditioner from a forged product to a finished product.

[Explanation of symbols]

 1, 1a Silencer 2 Base material 3 Cylindrical body with bottom 4 Bottom 4a, 7c, 8c Recess 4b, 7b, 8b Small diameter hole 4c, 7a, 8a Pipe socket 5 Opening 7 Restrictor 8 Peripheral part

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[Procedure amendment]

[Submission date] February 14, 2000 (2000.2.1
4)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

In order to achieve the above object, a silencer for an air conditioner according to the present invention is provided with a recess in which a pipe for introducing a refrigerant of the air conditioner is fitted, and a coolant is provided at the bottom of the recess and through which the coolant flows. comprising a pipe socket having a small diameter hole, and a pipe socket having a small diameter hole pipe for discharging the refrigerant is refrigerant provided in the bottom of the recess and the recess flows to fit, these pipes socket In a silencer for an air conditioner in which the basic shape before processing is formed into a bottomed cylindrical body shape by forging, a recess substantially equal to the outer diameter of the pipe is formed at the bottom of the bottomed cylindrical body during the forging, A small- diameter hole smaller than the outer diameter of the recess is punched out at the bottom of the recess to provide one of the pipe sockets having a step, and necking is performed on the opening side of the bottomed cylindrical body.
Squeezing to form a small- diameter hole smaller than the outer diameter of the pipe, pressing the inner peripheral portion of the small- diameter hole to form a recess approximately equal to the outer diameter of the pipe by pressing , and The other side of the mouth is provided.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction contents]

Although the embodiments of the present invention have been described above, the present invention is, of course, not limited to these, and the dimensions, materials, shapes, relative arrangements, and manufacturing steps of the components are based on the scope of the present invention. It is not intended to be limiting. Hereinafter, an example of a modified example will be described. Silencer 1 shown in FIGS.
Has one pipe receiving port 4c in the bottom part 4, but differs from the silencer 1a shown in FIG.

Claims (2)

[Claims] An air conditioner has a recess into which a pipe for introducing a refrigerant is fitted, a pipe receiving hole provided at the bottom of the recess and having a small hole through which the refrigerant flows, and a pipe for discharging the refrigerant. A silencer for an air conditioner, comprising: a recess formed in the bottom of the recess; and a pipe port having a small-diameter hole through which the refrigerant flows. The basic shape before processing is formed into a bottomed cylindrical shape by forging. In the forging, a recess is formed at the bottom of the bottomed cylindrical body, and the small-diameter hole is pressed at the bottom of the recess to provide one of the pipe receiving ports, and the bottomed cylindrical body is provided. A silencer for an air conditioner, characterized in that a small-diameter hole is formed by necking on the opening side of the above, and a concave portion is formed in the inner peripheral portion of the small-diameter hole by pressing to provide the other of the pipe ports. 2. The air conditioner according to claim 1, wherein said recess is provided in a peripheral portion of said bottomed cylindrical body by a press, and a small-diameter hole formed by press punching is provided in a bottom portion of said recess. For silencer.