JPH07332578A - Vibration absorber - Google Patents

Abstract

(57) [Summary] [Object] The present invention has a shape of the sleeve 3 having a bottomed cylindrical body (however, a hole into which a bellows connecting portion is fitted is formed so that a release agent does not have to be applied at the time of pouring liquid rubber). By forming it into (having), the curing failure of the liquid rubber is eliminated and the adhesive strength with the inner surface of the sleeve 3 is not lowered. According to the vibration absorbing tube of the present invention, a thin metal is formed in a bellows shape to provide flexible portions 4 and connecting portions 5 are provided at both ends thereof.
Bellows 2 formed by forming A and 5B, and the flexible portion 4
Straight portion 7 formed with an inner diameter d1 larger than the outer diameter D1 of the bellows portion and the connecting portion 5A at one end of the straight portion 7.
Or between the sleeve 3 made of an elastic body having a holed bottom portion 9 formed with an inner diameter d2 smaller than the outer diameter of 5B,
It is characterized in that it is filled with a cushioning material 8 made of an elastic body having a lower elasticity than that of the sleeve 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration absorbing tube for suppressing the propagation of vibration generated from a compressor in a refrigerant circuit and a pneumatic circuit, a pump in a hydraulic circuit, and the like.

[0002]

2. Description of the Related Art FIG. 3 shows a Japanese Patent Application No. 5-330 filed by the present applicant.
FIG. 10 is a vertical cross-sectional view of a conventional vibration absorption tube filed in No. 024, which includes a bellows 2 having connecting portions 5A and 5B at both ends, a hollow cylindrical sleeve 3, and a space between the bellows and the sleeve. It is constituted by the cushioning material 8 filled in. The bellows 2 is made of a thin metal (for example, a wall thickness of 0.1).
Connection parts 5A and 5B (outer diameter dimension is D2) at both ends of the flexible portion 4 (outer diameter dimension is D1) formed in a bellows shape from 0 to 0.40 mm, austenitic stainless steel such as SUS304). It is integrally provided by gluing. The sleeve 3 is formed in a tubular shape by vulcanizing NBR, IIR, natural rubber or the like, for example, and the inner diameter d1 of the sleeve 3 is larger than the mountain outer diameter D1 of the flexible portion 4. . The cushioning material 8 is a liquid rubber having a lower elasticity than that of the sleeve 3 between the outer circumference of the bellows 2 and the inner circumference of the sleeve 3 (for example, a two-liquid mixed type, pressureless room temperature or pressureless heating). Liquid rubber such as urethane rubber which cures at () is injected and further cured. In the refrigerant circuit, it is common to join the vibration absorbing pipe to the connected pipe made of pure copper pipe by brazing, and in order to improve the jointability with the connected pipe, the connecting portions 5A and 5B are connected to the pure copper pipe. It is generally manufactured and is integrally joined to the flexible portion 4.

FIG. 4 is a drawing for explaining a step of injecting liquid rubber among the manufacturing steps of the vibration absorbing tube in the conventional method, and FIG. 5 is a vertical sectional view of an injection jig used in this step. . The injection jig 11 shown in FIG. 5 has a sleeve seat portion 12 formed to have a dimension d3 slightly smaller than the outer diameter of the sleeve 3 from above, a packing valve seat 13, and a hole 14 into which the bellows connecting portions 5A and 5B are fitted. The packing valve seat 13 is fitted with a ring-shaped rubber packing 15 having an inner diameter dimension d4 smaller than the dimension D2 of the bellows connecting portions 5A and 5B. When manufacturing the vibration absorbing tube, a mold release agent (for example, silicon grease) is applied in advance to the surface of the injection jig 11 that comes into contact with the liquid rubber, and then the connecting portion of the bellows 2 and the sleeve 3 are injected. After mounting on a jig and injecting liquid rubber into the filling space 10 formed between the bellows 2 and the sleeve 3 to cure at room temperature or heat to form the buffer material 8, the vibration absorbing tube 1 is injected and cured. It was supposed to be removed from the tool 11.

[0004]

As described above, in the conventional vibration absorbing tube, since the sleeve 3 has a hollow cylindrical shape, the mold release agent must be applied to the injection jig before the liquid rubber is injected. Therefore, the liquid rubber in the portion in contact with the mold release agent is likely to cause curing failure, and the mold release agent also penetrates into the inner surface of the sleeve so that the adhesive strength with the inner surface of the sleeve 3 is also reduced. In addition to this, there is a problem in that the work of applying the release agent thinly and uniformly is difficult to automate, and the increase of man-hours by manpower increases the cost.

[0005]

The present invention has been made in order to solve the above-mentioned problems, and the shape of the sleeve 3 is such that a mold release agent need not be applied when injecting liquid rubber. Is formed into a bottomed tubular body (provided that it has a hole into which the bellows connection portion fits), thereby eliminating the curing failure of the liquid rubber, reducing the adhesive strength with the inner surface of the sleeve 3, and preventing vibration. The present invention aims to provide a vibration absorption tube which does not deteriorate the releasability from the injection jig.

That is, the vibration absorbing tube of the present invention comprises a bellows 2 formed by forming a thin metal into a bellows shape and providing flexible portions 4 and connecting portions 5A, 5B integrally at both ends thereof, and the flexible portion. A straight portion 7 formed with an inner diameter d1 larger than the bellows portion outer diameter D1 of the portion 4, and a holed bottom portion 9 formed at one end of the straight portion with an inner diameter d2 smaller than the outer diameter of the connecting portion 5A or 5B; It is characterized in that a cushioning material 8 made of an elastic body having a lower elasticity than that of the sleeve 3 is filled between the elastic sleeve 3 and the elastic sleeve 3. Further, the sleeve 3 is a vibration absorbing tube made of vulcanized rubber, and the cushioning material 8 is a vibration absorbing tube made of cured rubber or foam rubber.

[0007]

The vibration absorbing pipe of the present invention is connected in the liquid rubber injection step by forming the bottom 9 with the hole formed at one end of the sleeve 3 with the inner diameter d2 smaller than the outer diameter of the connecting portion 5A or 5B. Since the sealing property is ensured between the portion and the bottom portion 9 with holes, the liquid rubber does not come into direct contact with the injection jig, and it becomes unnecessary to apply the release agent.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIG. The vibration absorbing pipe of the present invention has the connecting portions 5A, 5
The bellows 2 including B, the cylindrical sleeve 3 having a bottom, and the cushioning material 8 filled between the bellows and the sleeve are the same as the conventional product. Since it is good, detailed description thereof will be omitted. The sleeve 3 made of vulcanized rubber has a bellows mountain outer diameter D1.
It has a straight portion 7 formed with a larger inner diameter d1 and a holed bottom portion 9 formed at one end with an inner diameter d2 smaller than the outer diameter D2 of the bellows connecting portions 5A, 5B. The material of the vulcanized rubber and the material of the liquid rubber may be the same as those of the conventional product.

FIG. 2 is a process sectional view of injecting liquid rubber into the vibration absorbing tube of the present invention. In this figure, 11 is an injection jig, and the injection jig 11 has a sleeve seat 1 on its upper surface.
2 and has a connecting portion 5A of the bellows 2 at the center thereof
Alternatively, a hole 14 for inserting 5B is provided. In the present invention, first, the bottom portion 9 with holes of the sleeve 3 is
Insert one connection part 5A or 5B of the bellows 2 into
Next, the bottom portion 9 of the sleeve 3 is placed on the sleeve seat 12 of the injection jig 11. Then, similarly to the conventional product, a liquid rubber having a lower elasticity than that of the sleeve 3 is injected into the filling space 10 formed between the bellows 2 and the sleeve 3, and the buffer material 8 is cured by room temperature or heat curing. After being formed, the vibration absorbing tube 1 is removed from the injection jig 11.

Therefore, in the present invention, the filling space 10 for injecting the liquid rubber ensures the sealing property between the connecting portion and the bottom portion with the hole, so that the liquid rubber does not come into direct contact with the injecting jig 11. Since the step of applying the release agent can be eliminated without deteriorating the mold release property from the injection jig of the vibration absorbing tube, the curing failure of the liquid rubber in the liquid rubber injection step can be eliminated and the inner surface of the sleeve 3 can be eliminated. It is possible to prevent a decrease in adhesive strength.

[0011]

EFFECTS OF THE INVENTION The vibration absorbing tube of the present invention does not use a release agent which has been conventionally required by forming a bottom portion with a hole at one end of a vulcanized rubber sleeve, and is therefore caused by the release agent. It is an industrially extremely effective one that can eliminate the curing failure of the cushioning material (liquid rubber) and the reduction of the adhesive strength, greatly improve the quality, and significantly reduce the cost by eliminating the mold release agent coating process.

[0012]

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a vibration absorbing tube according to an embodiment of the present invention.

FIG. 2 is a process sectional view of injecting liquid rubber into the vibration absorbing pipe according to the embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view of a conventional vibration absorption tube.

FIG. 4 is a process sectional view of injecting liquid rubber into a conventional vibration absorbing tube.

FIG. 5 is a vertical sectional view of an injection jig according to a conventional technique.

[Explanation of symbols]

1 vibration absorption pipe, 2 bellows, 3 sleeve, 4 flexible part, 5 connection part, 7 straight part, 8 cushioning material, 9 bottom part with a hole, 10 filling space, 11 injection jig.

Claims (3)

[Claims] 1. A flexible portion 4 formed by forming a thin metal into a bellows shape.
And a straight portion 7 formed with an inner diameter d1 larger than the bellows portion outer diameter D1 of the flexible portion 4, and a bellows 2 formed by connecting portions 5A and 5B at both ends thereof, and at one end of the straight portion. Between the sleeve 3 made of an elastic body having a bottom 9 with a hole formed with an inner diameter d2 smaller than the outer diameter of the connecting portion 5A or 5B, an elastic body having a lower elasticity than that of the sleeve 3 is used. A vibration absorbing tube characterized by being filled with a cushioning material 8. 2. The vibration absorbing tube according to claim 1, wherein the sleeve 3 is made of vulcanized rubber, and the cushioning material 8 is made by hardening liquid rubber. 3. The vibration absorbing tube according to claim 1, wherein the sleeve 3 is made of vulcanized rubber and the cushioning material 8 is made of foamed rubber.