JPH11210935A - Piping fitting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clamp to reduce a product cost of the whole of an air-conditioning device for a vehicle and ensure a heat insulation effect of an insulator. SOLUTION: A heat insulation material holding part 31 to hold an insulator 24 at the outer periphery of a caulking metal fitting 19 is formed integrally with a clamp 1 to fix a rubber hose 14, protected from high temperature atmosphere by the insulator 24, on the car body side. Three protrusion parts 33 protruding to the inside are formed on the heat insulation material holding part 31 of the clamp 1, and the insulator 24 is strongly fixed at the outer periphery of the caulking metal fitting 19. Further, between the adjoining protrusion parts 33, an air layer is formed between the outer periphery of the insulator 24 and the inner periphery of the heat insulation material holding part 31 of the clamp 1, thickness sufficient to the insulator 24 is held, and the heat insulation effect of the insulator 24 is ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe fitting, and more particularly, to an outer periphery of a refrigeration cycle pipe for holding a heat insulating material for protecting the refrigeration cycle pipe from a high-temperature atmosphere. The present invention relates to a pipe fitting such as a clamp for attaching a pipe to a base such as a vehicle body.

[0002]

2. Description of the Related Art Conventionally, for example, in a vehicle air conditioner, as shown in FIG. 4, a metal pipe 101 serving as a refrigeration cycle pipe is connected to a rubber hose 102 having an outer diameter larger than the metal pipe 101. (Refer to Japanese Utility Model Registration No. 2515893, etc.). Here, a crimping fitting 103 for fixing the end of the metal pipe 101 by caulking is attached to the tip of the rubber hose 102. In addition, the refrigeration cycle pipe is generally mounted on a vehicle,
It is necessary to connect the compressor and refrigeration equipment in the vehicle cabin through the vicinity of the engine that drives the compressor.

[0003]

However, when the refrigeration cycle piping is exposed to a high-temperature atmosphere around the engine, the rubber hose 102 is deteriorated, and the crimping fitting 10 is deteriorated.
In the case of No. 3, the strength of the swaged portion is reduced, so that there is a problem that the internal fluid (refrigerant) leaks from between the outer circumference of the metal pipe 101 and the inner circumference of the rubber hose 102. Therefore, when laying out refrigeration cycle piping in a high-temperature atmosphere around the engine, generally, an insulator 104 as a heat insulating material is wound around the outer periphery of the crimping fitting 103 and the rubber hose 102.

[0004] Specifically, the outer periphery of a rubber hose 102 and a crimping fitting 103 are formed around a cylindrical insulator 104.
The insulator 104 is covered with the rubber hose 10
2 was lightly stopped by the iron band 105 so as not to move around the outer periphery of the iron band. The reason for this is that if the insulator 104 is firmly fastened to the outer periphery of the rubber hose 102 with the iron band 105, the thickness of the insulator 104 becomes thin, and the heat insulating effect may be reduced. When the above-described refrigeration cycle piping is fixed to a base such as a vehicle body, a clamp 106 is fitted to the outer periphery of the metal pipe 101 and the clamp 106 is attached to the base by a mounting bolt 107.
To fix the refrigeration cycle piping firmly.

However, the provision of the iron band 105 for fixing the insulator 104 and the clamp 106 for fixing the piping for the refrigeration cycle causes a problem that the product cost of the entire refrigeration cycle is increased. When it is necessary to provide a clamp 106 near the crimping fitting 103 of the refrigeration cycle pipe due to restrictions on the vehicle side, the position of the crimping fitting 103, that is, the metal pipe 1
01 and the rubber hose 102 must be moved, which causes a problem that the flexibility of the vehicle layout of the refrigeration cycle piping is poor.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a pipe fitting which can reduce the product cost of the entire apparatus by integrating the heat insulating material holding means and the pipe fixing means. Another object of the present invention is to provide a pipe fitting which can improve the flexibility of piping layout and does not reduce the heat insulating effect of the heat insulating material.

[0007]

Means for Solving the Problems Claims 1 and 2
According to the invention described in the above, by integrating the heat insulating material holding means for holding the heat insulating material on the outer circumference of the pipe and the pipe fixing means for attaching the pipe to the base, the heat insulating material is provided on the outer circumference of the pipe. Since the holding operation for holding and the attaching operation for attaching the pipe to the base can be performed at the same time, the product cost of the pipe fitting can be reduced. Thereby, the product cost of the entire apparatus can be reduced. In addition, since the protrusion is partially provided on the heat insulating material holding means, a partial pressing force acts on the pipe, so that the protrusion can be fixed in terms of strength and a heat insulating effect can be provided in a place other than the protrusion. .

According to the third aspect of the present invention, the heat insulating material holding means is formed by winding a metal plate around the outer periphery of the heat insulating material, and the pipe fixing means is bonded by bonding both longitudinal ends of the metal plate. Is formed. By fastening the pipe fixing means on the base, the heat insulating material can be firmly fixed to the outer periphery of the pipe, and the pipe can be firmly fixed on the base.

According to the invention described in claim 4, the heat insulating material holding means is provided with a plurality of convex portions extending in a direction substantially orthogonal to the winding direction of the heat insulating material holding means. In addition, these convex portions do not become resistance portions against winding, and the heat insulating material holding means can be easily wound around the outer periphery of the heat insulating material.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [Structure of Embodiment] FIGS. 1 to 3 show an embodiment of the present invention.
FIG. 3 is a diagram illustrating a clamp for attaching a refrigeration cycle pipe of a vehicle air conditioner to a vehicle body, and FIG. 3 is a diagram illustrating a refrigeration cycle of the vehicle air conditioner.

The vehicle air conditioner of the present embodiment includes a clamp 1 for attaching a refrigeration cycle pipe 11 to a vehicle body. Here, as shown in FIG. 3, the refrigeration cycle is a compressor (refrigerant compressor) 3 that compresses and discharges the refrigerant when the driving force of the engine (internal combustion engine) 2 is transmitted.
And a condenser (refrigerant condenser) 4 for condensing and liquefying the refrigerant discharged from the discharge port of the compressor 3, and a receiver (gas-liquid separator) 5 for separating the refrigerant flowing out of the condenser 4 into gas and liquid. ing.

An expansion valve (decompression means) 6 for reducing and expanding the liquid refrigerant flowing out of the receiver 5 is provided.
It is composed of an evaporator (refrigerant evaporator) 7 for evaporating and evaporating the refrigerant that has flowed in, and the refrigeration cycle piping 11 for connecting these in a ring shape. The compressor 3 is provided with an electromagnetic clutch 8 for interrupting the driving force of the engine 2. The condenser 4 and the evaporator 7 are provided with a cooling fan 9 and a blower 10 for sending air to the condenser 4 and the evaporator 7, respectively.

The refrigeration cycle pipe 11 includes a high-pressure pipe connecting the discharge port of the compressor 3 and the inlet of the expansion valve 6,
There is a low-pressure pipe connecting the outlet of the expansion valve 6 and the suction port of the compressor 3. A metal pipe 12 having a small outer diameter and a rubber hose 13 having an outer diameter larger than the metal pipe 12 are provided between the discharge port of the compressor 3 and the inlet side of the condenser 4 in the high-pressure pipe. . Also, the outlet side of the evaporator 7 and the compressor 3 in the low pressure pipe
A rubber hose (corresponding to a rubber fluid pipe of the present invention) 14 having a large outer diameter and a metal pipe having an outer diameter smaller than the rubber hose 14 (a metal fluid pipe of the present invention) 15) are provided.

Here, a rubber hose 14 and a metal pipe 15
1 and 2 (a),
This will be described in detail based on (b). First, metal pipe 1
A coolant passage 17 is formed in 5. In the rubber hose 14, a refrigerant passage (corresponding to a fluid passage of the present invention) 18 for sending the refrigerant into the refrigerant passage 17 is formed. One end of a metal pipe 15 is inserted into the distal end of the rubber hose 14, and a metal caulking fitting 19 for caulking and fixing the metal pipe 15 to the rubber hose 14 is attached to the outer periphery of the distal end. Have been.

The crimping fitting 19 is formed by press-forming an aluminum plate, for example, and has an annular portion 20 fitted to the outer periphery of the metal pipe 15 and extends from the outer periphery of the annular portion 20 in the longitudinal direction of the rubber hose 14. And a cylindrical portion 21. In addition, the inner periphery of the annular portion 20 is configured to be fitted into a circumferential groove (not shown) formed on the outer periphery of the metal pipe 15.
5 is retained. A plurality of (two in this example) ridges 22 are formed in the cylindrical portion 21 in the circumferential direction so as to bite into the outer periphery of the tip of the rubber hose 14. A circumferential groove 23 is formed on the outer peripheral surface of these ridges 22.

The compressor 3 side of the low-pressure pipe (or the high-pressure pipe) is exposed to a high-temperature atmosphere around the engine 2 because the compressor 3 is driven by the belt of the engine 2. For this reason, in the present embodiment, the rubber hose 1
4 and the caulking fitting 19 around the engine 2
Insulator 2 for protection from surrounding high temperature atmosphere
4 is coated.

The insulator 24 corresponds to the heat insulating material of the present invention, and is formed by molding a material such as glass wool into a cylindrical shape, and insulates the inner peripheral side and the outer peripheral side. The insulator 24 includes a metal fitting protection portion 25 that covers the outer circumference of the caulking metal 19 and a hose protection portion 26 that covers the outer circumference of the rubber hose 14 exposed from the metal caulking 19.
It is composed of

Next, a clamp 1 for attaching the compressor 3 side of the low-pressure pipe (or high-pressure pipe) of the refrigeration cycle pipe 11 to a base provided in the engine room of the vehicle.
Will be described in detail with reference to FIGS. 1 and 2A and 2B.

The clamp 1 corresponds to the pipe fitting of the present invention, and is formed by, for example, pressing an iron plate. Then, the clamp 1 attaches the insulator 24 to the caulking fitting 1.
The heat insulating material holding portion 31 for holding the heat insulating material 9 on the outer periphery of the rubber hose 14 and a pipe fixing portion 32 provided integrally with the heat insulating material holding portion 31 are provided.

The heat insulating material holding portion 31 corresponds to the heat insulating material holding means of the present invention, and is wound around the outer periphery of the metal fitting protecting portion 25 of the insulator 24 in a substantially cylindrical shape.
A direction substantially perpendicular to this winding direction (rubber hose 1
4 (longitudinal direction 4) in the plural (three in this example) convex portions 33
Has been extended. These convex portions 33 correspond to the projecting portions of the present invention, and a concave portion 34 in the same direction as the convex portion 33 is formed on the outer peripheral surface.

The pipe fixing part 32 corresponds to the pipe fixing means of the present invention, and is constituted by bonding the inner surface of one end of the clamp (iron plate) 1 in the longitudinal direction to the inner surface of the other end. It is fastened and fixed on a base (for example, a bracket or a vehicle body-side structure) provided in an engine room of the vehicle using a fastener 35 such as a mounting bolt.

[Fixing Method of the Embodiment] Next, the joint portion 1 of the rubber hose 14 and the metal pipe 15 of the present embodiment will be described.
The fixing method of No. 6 will be briefly described with reference to FIGS.

First, a caulking fitting 19 is attached to the outer periphery of the distal end side of the rubber hose 14, and the outer periphery of the caulking fitting 19 and the outer periphery of the rubber hose 14 are covered with an insulator 24. Then, the rubber hose 14 and the metal pipe 15 are assembled by inserting one end of the metal pipe 15 into the distal end side of the refrigerant passage 18 of the rubber hose 14 to which the caulking metal 19 is fixed, and caulking the caulking metal 19.

Next, after the heat insulating material holding portion 31 of the clamp 1 is wound around the outer periphery of the metal fitting protection portion 25 of the insulator 24 previously fitted to the outer periphery of the rubber hose 14,
1 and 2 (a) by attaching a two-part pipe fixing part 32 extending from both ends of the heat insulating material holding part 31.
As shown in (2), it is fastened and fixed on the base provided in the engine room using the fastener 35. This allows
With one clamp 1, the joint portion 16 between the rubber hose 14 and the metal pipe 15 can be firmly fixed to the vehicle body side.

At this time, as shown in FIGS. 1 and 2 (a), the plurality of convex portions 33 provided on the heat insulating material holding portion 31 of the clamp 1 form a part of the insulator 24 in the circumferential direction. To the axis side. Thus, the insulator 24 can be firmly held on the outer periphery of the joint 16 by the clamp 1 for fixing the joint 16 without lowering the heat insulating effect of the insulator 24.

[Operation of Embodiment] Next, the operation of the clamp 1 of this embodiment will be briefly described with reference to FIGS.

When the electromagnetic clutch 8 is turned on, the engine 2
Is transmitted, the compressor 3 starts, and the compressor 3 compresses and discharges the refrigerant. At this time, the refrigerant evaporated and vaporized by the evaporator 7 is sucked into the suction port of the compressor 3 through the rubber hose 14 and the metal pipe 15.

Here, the tip end of the rubber hose 14 and the swaging metal fittings 19 fixed to the tip end of the rubber hose 14.
Is exposed to a high-temperature atmosphere around the engine 2 because the compressor 3 is fixed to the vehicle body by the clamp 1 on the compressor 3 side. However, in the present embodiment, the rubber hose 14
Since the front end side of the rim and the outer periphery of the crimping fitting 19 are covered with the cylindrical insulator 24, the rubber hose 14 does not deteriorate, and the crimping fitting 19 does not cause a reduction in strength of the crimping portion. Thereby, the metal pipe 1
The problem that the refrigerant leaks out from between the outer periphery of the rubber hose 5 and the inner periphery of the rubber hose 14 is eliminated.

[Effects of the Embodiment] As described above, in this embodiment, the heat insulating material holding portion 31 for holding the insulator 24 on the outer periphery of the caulking fitting 19 and the pipe for fixing the refrigeration cycle pipe 11 to the vehicle body side. By integrally providing the fixing portion 32 with one clamp 1, the holding operation for holding the insulator 24 and the attaching operation for attaching the refrigeration cycle pipe 11 to the vehicle body side can be performed at the same time. The product cost of the entire refrigeration cycle of the air conditioner can be reduced.

Even when it is necessary to provide the clamp 1 near the crimping fitting 19 of the refrigeration cycle pipe 11 due to restrictions on the vehicle side, since the heat insulating material holding portion 31 and the pipe fixing portion 32 are integrated, the crimping is performed. It is not necessary to move the position of the metal fitting 19, that is, the joint portion 16 between the metal pipe 15 and the rubber hose 14, and the freedom of the vehicle layout of the refrigeration cycle piping 11 can be improved.

The heat insulating material holding portion 3 of the clamp 1 according to the present embodiment.
1 is provided with a plurality of convex portions 33 (recess portions 34) in order to strongly fix to the cylindrical portion 21 of the caulking fitting 19 in terms of strength. For this reason, the clamp 1 is connected to the insulator 24.
When the outer periphery of the metal fitting protection part 25 is wound, the plurality of convex parts 33 strongly press the cylindrical part 21, so that the insulator 24 can be strongly fixed to the caulking metal fitting 19 by the clamp 1.

In the heat insulating material holding portion 31 between the adjacent convex portions 33, the insulator 24 is not strongly pressed, so that the insulator 24 has a sufficient thickness, and the inner circumferential surface of the heat insulating material holding portion 31 of the clamp 1 is maintained. An air layer is formed between the outer periphery of the metal fitting protection portion 25 of the insulator 24. This allows
Since the entire circumference of the metal fitting protection portion 25 of the insulator 24 is firmly fixed to prevent the thickness from becoming thin, the heat insulating effect of the insulator 24 can be ensured.

[Other Embodiments] In this embodiment, an example is shown in which the present invention is applied to a clamp 1 for fixing a low-pressure pipe of a refrigeration cycle to a vehicle body side. You may apply to the clamp fixed to a vehicle body side. Further, the present invention is applied not only to a pipe fitting for fixing a refrigeration cycle pipe of a vehicle air conditioner, but also to a pipe fitting for fixing a refrigeration cycle pipe of a building, air conditioner for a building structure such as a factory, a house or a building. May be used. Further, as the fluid flowing through the piping, not only a refrigerant, but also a liquid such as water,
Alternatively, a gas such as steam may be used.

In the present embodiment, a plurality of convex portions (projections) 33 are provided extending in the longitudinal direction of the rubber hose 14, but two or three projections are provided in the longitudinal direction of the rubber hose 14.
It may be provided divided into more than one. Further, the protrusion may be provided by forming a metal plate such as an iron plate in a corrugated shape in a circumferential direction or a cylindrical direction.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a clamp for attaching a refrigeration cycle pipe to a vehicle body (embodiment).

FIG. 2A is a front view showing a clamp for attaching a refrigeration cycle pipe to a vehicle body, and FIG. 2B is a cross-sectional view showing a clamp for attaching a refrigeration cycle pipe to the vehicle body (embodiment) Form).

FIG. 3 is a configuration diagram illustrating a refrigeration cycle of the vehicle air conditioner (embodiment).

FIG. 4 is a perspective view showing a clamp (prior art).

[Explanation of symbols]

 1 Clamp (Piping Fixture) 2 Engine 3 Compressor 14 Rubber Hose (Rubber Fluid Pipe) 15 Metal Pipe (Metal Fluid Pipe) 18 Refrigerant Passage (Fluid Passage) 19 Caulking Fitting 24 Insulator (Heat Insulation Material) 31 Insulation Material Holding Part (insulation material holding means) 32 Pipe fixing part (piping fixing means) 33 Convex part (projection part) 34 Depressed part 35 Fastener

Claims (4)

[Claims] 1. A pipe fitting which integrates a heat insulating material holding means for holding a heat insulating material for protecting a pipe from a high-temperature atmosphere on an outer periphery of the pipe, and a pipe fixing means for mounting the pipe on a base. A pipe fitting, wherein the heat insulating material holding means is provided partially with a projection for applying a pressing force to the pipe. 2. The pipe fitting according to claim 1, wherein the pipe is a rubber fluid pipe to which a caulking fitting for connecting a metal fluid pipe is attached, and a fluid in which a fluid flows. A pipe fitting characterized by forming a passage. 3. The pipe fitting according to claim 1, wherein said heat insulating material holding means is formed by winding a metal plate around an outer periphery of said heat insulating material, and said pipe fixing means is formed of said metal fixing means. A pipe fitting characterized by being formed by bonding both ends in the longitudinal direction of a plate and being fastened and fixed on the base. 4. The pipe fitting according to claim 1, wherein the protrusion is extended in a direction substantially perpendicular to a direction in which the heat insulating material holding means is wound, and an outer surface of the pipe fitting. A pipe fitting characterized by being a plurality of convex portions forming a concave portion in the pipe fitting.