JP2000130681A - Connection structure of hose and pipe joint and connection method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To heat-fuse a hose and a pipe joint satisfactorily by providing the hose with a pipe wall part and a reinforcing wire material, reducing a thickness of an end part on connection side with the pipe joint in the reinforcing wire material so that the thickness becomes smaller than thickness of the other parts, and heat-fusing an end face on connection side with the pipe joint in the hose and a face corresponding to the pipe joint. SOLUTION: When this connection structure of a hose and a pipe joint is applied to a drain pipe for a room air conditioner, electricity is conducted into heating parts 18A, 19A to heat heating bodies 18, 19, and then a tip part of the heating body 18 is inserted into an outer cylindrical body 12 of a pipe joint 10 to heat and fuse a front end face 16A of a projecting part 16. Moreover, end faces on connection side 1A, 2A of a drain hose 1 and a thermal insulation material 2 are brought into contact with the heating body 19, and these end faces on connection side 1A, 2A are heated and fused. End parts on connection side of the drain hose 1 and the thermal insulation material 2 are inserted into the outer cylindrical body 12, the end faces on connection side 1A, 2A are brought into contact with the front end face 16A and are heat-fused, and the hose 1 and the thermal insulation material 2 are fixed on the pipe joint 10. Consequently, it is possible to prevent a deviation of the thermal insulation material 2 for the hose 1 in the direction of axial core.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure between a hose and a pipe joint and a connection method thereof.

[0002]

2. Description of the Related Art A drain pipe is connected to a room air conditioner (air conditioner), and a part of the pipe is generally formed of a flexible synthetic resin drain hose. The hose is connected to the other part of the piping via a pipe joint. The drain hose has a tube wall that mainly constitutes the hose, and a reinforcing wire rod spirally provided on the tube wall.

Conventionally, the drain hose and the pipe joint are made of vinyl chloride resin, and both are fixed with an adhesive. However, when incinerated, an organic chlorine compound represented by dioxin is generated. , There is a problem of environmental pollution. Therefore, recently, vinyl chloride resin has not been used as the material of the drain hose and the pipe joint. For example, the pipe wall of the drain hose is made of a soft synthetic resin such as EVA resin (ethylene-vinyl acetate copolymer). In addition to the resin, the reinforcing wire and the pipe joint of the drain hose are each made of a hard synthetic resin such as polypropylene (PP) or a soft or hard synthetic resin such as polyethylene (PE), which is an olefin resin. I have.

[0004]

However, if the reinforcing wire and the pipe joint of the drain hose are made of an olefin resin, the drain hose and the pipe joint are bonded with an adhesive unless special and costly special treatment is performed. It was difficult, and the problem was how to fix them. The present invention
An object of the present invention is to provide a connection structure between a hose and a pipe joint, which can solve the above problem, and a connection method thereof.

[0005]

In order to achieve the above-mentioned object, the connecting structure of the hose and the pipe joint according to the present invention is characterized in that a flexible synthetic resin hose and a synthetic resin pipe joint are used. In the connection structure, the hose has a tube wall portion that mainly forms the hose, and a reinforcing wire rod spirally provided on the tube wall portion. The point is that the end face of the hose on the connection side with the pipe joint and the corresponding surface of the pipe joint are heat-sealed. In some cases, a heat insulating material is externally fitted to the hose, and the end surface of the heat insulating material on the connection side with the pipe joint and the corresponding surface of the pipe joint may be heat-sealed. In addition, the pipe joint has an inner cylinder body that opens in the front-rear direction and to which the hose is connected from the front, and an outer cylinder body that is fitted externally concentrically to the inner cylinder body and that opens forward, and The outer cylinder has a projecting portion projecting radially outward from the inner cylinder, and a cylindrical cover projecting forward from the outer periphery of the projecting portion. The end face on the connection side with the joint and the front end face of the protruding portion may be heat-sealed. Further, a heat insulating material may be externally fitted to the hose, and an end surface of the heat insulating material on the connection side with the pipe joint and a front end surface of the protruding portion may be heat-sealed. In addition, the thickness of the pipe wall at the end on the connection side with the pipe joint may be larger than the thickness of other portions. Further, a feature of the method for connecting a hose and a pipe joint according to the present invention is that the connection side end face of the hose with the pipe joint is brought into contact with a heating element, and the connection side end face is heated, thereby melting the hose. At the same time, a cylindrical heating element is inserted into the outer cylinder, the front end face of the heating element is brought into contact with the front end face of the protruding portion, and the front end face of the protruding portion is heated to be melted. , At the projecting part, at the molten front end face, and at the hose,
The point lies in that the fused connection-side end face is thermally fused. Incidentally, the heating element, together with the hose, in the heat insulating material externally fitted to the hose, the connection side end face of the pipe joint is abutted, and the connection side end face is heated, thereby being melted and melted.
In some cases, the fused connection-side end surface and the molten front end surface of the protruding portion are heat-fused.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention applied to a drain pipe of a room air conditioner will be described below with reference to FIGS. In the drawing, 1
Is a first drain (drainage) hose to which the heat insulating material 2 is fitted.
It has flexibility. The hose 1 includes a tube wall 3 having a circular cross section and a reinforcing wire 4 spirally contained in the tube wall 3 and having an elliptical or circular cross section. The tube wall 3
A soft synthetic resin such as EVA resin (ethylene-vinyl acetate copolymer) which is a copolymer of ethylene and vinyl acetate is used. The reinforcing wire 4 is made of a hard synthetic resin such as polypropylene (PP) which is an olefin-based synthetic resin. It is made of resin. In the portion excluding the end of the hose 1, the pipe wall 3 is made thin (thin wall), and the reinforcing wire 4 is made thicker. A ridge 5 projecting in a curved shape is formed in a spiral shape. However, at least at one end of the hose 1, the reinforcing wire 4 is made thinner than the other portions to form a thread-like thin wire portion 4 </ b> A, and the wall thickness of the tube wall portion 3 is thicker than the other portions. 3A
It has been. The inner surface of the hose 1 is a smooth surface, and the inner diameter is constant over the entire length in the axial direction.

[0007] In the case of manufacturing the above-mentioned hose 1, a strip of a fixed width made of a soft synthetic resin such as EVA resin in a semi-molten state is continuously extruded from a molding nozzle of a strip-shaped extruder. The tube wall 3 is formed by spirally winding the material on the forming rotary shaft, overlapping the corresponding ends in the width direction at adjacent winding portions, and welding them together. At the same time, at the same time, the reinforcing wire 4 made of a hard synthetic resin such as polypropylene in a semi-molten state is continuously extruded from the forming nozzle of the extruder for reinforcing wire, and the overlapping end of the adjacent wound portion is overlapped. The tube wall 3
The reinforcing wire 4 is included.

The heat insulating material 2 is made of a material such as sponge (or felt) having appropriate elasticity and flexibility, is made of polyethylene as an olefin resin, and is spirally wound. Although not shown, an intermediate wall made of EVA resin is externally fitted or spirally wound on the outer peripheral surface of the heat insulating material, and the outer peripheral surface of the intermediate wall is made of an olefin resin. An outer peripheral wall made of a nonwoven fabric made of polyethylene (PE) is spirally wound. In the following, when the heat insulating material 2 is referred to, the above-mentioned intermediate wall and outer peripheral wall are also included.

Reference numeral 10 denotes a pipe joint, which is made of a soft or hard synthetic resin such as an olefin resin such as polyethylene, and is opened in the front-rear direction and has a circular cross section. 1 and 2, the front side is defined as a front side.) The inner cylindrical body 11 is integrally fitted with an outer cylindrical body 12 which is fitted concentrically and opened forward. Inner cylinder 1
The front part of 1 is a connection part 13 to which the drain hose 1 is connected from the front. The outer cylindrical body 12 is provided with a protruding portion 16 protruding radially outward from a boundary between the two connecting portions of the inner cylindrical body 11.
And a cylindrical cover portion (hakama portion) 17 protruding forward from the outer periphery of the protruding portion 16.

According to the above configuration example, when the drain hose 1 and the heat insulating material 2 are connected to the pipe joint 10, the first heating element 18 made of a metal cylinder as shown in FIG. A plate-shaped second heating element 19 as shown in FIG. 5 is used. These heating elements 18 and 19 are composed of a heating section 18 made of a nichrome wire or the like.
A, 19A, and the heat generating portions 18A, 19A are connected to a power supply.

[0011] First, electricity is supplied to the heat-generating portions 18A and 19A to heat the heat-generating members 18 and 19, and as shown in FIG. It is inserted into the outer cylinder 12 and is brought into contact with the front end face 16A of the protruding portion 16, so that the front end face 16A is heated and melted.
Further, the plate-shaped second heating element 19 is heated, and as shown in FIG. 5, the connection side end faces 1A and 2A of the drain hose 1 and the heat insulating material 2 with the pipe joint 10 are brought into contact with the heating element 19. Then, these connection side end faces 1A and 2A are heated and melted.

Then, the connection side ends of the drain hose 1 and the heat insulating material 2 are inserted into the outer cylinder 12 of the pipe joint 10,
Connection side end surfaces 1A, 2A of drain hose 1 and heat insulating material 2
Is brought into contact with the front end face 16 </ b> A of the projecting portion 16 of the outer cylindrical body 12, and heat-fused to fix the drain hose 1 and the heat insulating material 2 to the pipe joint 10. Thus, if the heat insulating material 2 is also fixed to the pipe joint 10, there is no fear that the heat insulating material 2 and the drain hose 1 are displaced in the axial direction.

In the above case, the connection 13 between the inner peripheral surface of the drain hose 1 and the inner cylinder 11 of the pipe joint 10 is formed.
It is also conceivable to melt the outer peripheral surface and heat-seal it.
However, in this case, the drain hose 1 is connected to the connection 1
3, the melted inner peripheral surface of the drain hose 1 and the melted outer peripheral surface of the connection portion 13 of the inner cylinder body 11 of the pipe joint 10 are heat-fused to connect the drain hose 1 to the connection portion 13. There is a fear that it cannot be fitted to the predetermined position. On the other hand, in the present invention, as described above, the connection side end surfaces 1A and 2A of the drain hose 1 and the heat insulating material 2 and the front end surface 16A of the protruding portion 16 of the outer cylinder 12 are melted to form the connection side end surface. 1A, 2A and front end face 1
Since 6A was heat-sealed, there is no fear of the above.

FIGS. 10 and 11 show a comparative example with the present invention. The same reference numerals as those in FIGS. 1 and 2 denote the same members and the same parts. In this comparative example, the thickness of the reinforcing wire 4 of the drain hose 1 and the thickness of the pipe wall 3 are made constant in the axial direction, so that the drain hose 1 is also reinforced at the end on the connection side with the pipe joint 10. The thickness of the wire 4 is increased, and the thickness of the tube wall 3 is reduced.

In the above comparative example, in the drain hose 1, the reinforcing wire 4 is made of polypropylene, which is a hard material, and has a high melting point, but the tube wall 3 is made of EVA resin, which is a soft material. , Its melting point is low. In this case, when the end of the drain hose 1 on the connection side with the pipe joint 10 is heated and melted, the thickness of the reinforcing wire 4 is also large at the connection end, so It takes a long time for the drain hose 1 to melt.
Needs to be heated at a high temperature, whereby the tube wall 3 having a low melting point and a small thickness is excessively melted and becomes a mushy state, so that the drain hose 1 and the pipe joint 10 cannot be thermally fused well. There is fear.

On the other hand, according to the first example of the above-described embodiment, at the end of the drain hose 1 on the connection side with the pipe joint 10, the reinforcing wire 4 having a high melting point is reduced in thickness to form a thin wire portion. 4
By forming A, the time for melting to the core of the reinforcing wire 4 is shortened, and the wall thickness of the tube wall 3 having a low melting point is increased to form the thick wall portion 3A. So that the drain hose 1 and the pipe joint 10
Can be thermally fused.

FIGS. 6 and 7 show a second embodiment of the present invention.
8 and 9 show a third example of the embodiment of the present invention.
Each is shown. In the second example, only the differences from the first example will be described. In the drain hose 1, no heat insulating material is fitted. In the third example, the first
If only the differences from the example are explained, the drain hose 1 has
The heat insulating material is not fitted outside, and the wall thickness of the tube wall 3 is increased over the entire length in the axial center direction.

In the above-described embodiment, the present invention is applied to a drain pipe of a room air conditioner.
The present invention can be applied to, for example, a pipe for drain in a kitchen.

[0019]

As described in detail above, according to the present invention,
A hose and a pipe joint can be connected and fixed without using an adhesive. Also, at the end of the connection side of the hose with the pipe joint, the thickness of the reinforcing wire having a high melting point was reduced, and the time required for melting to the core of the reinforcing wire was shortened so that the pipe wall was not excessively melted. Therefore, the hose and the pipe joint can be satisfactorily heat-sealed.

According to the second and fourth aspects, the heat insulating material externally fitted to the hose can also be heat-fused to the pipe joint and connected and fixed, so that the heat insulating material can be prevented from being displaced in the axial direction with respect to the hose. For example, when the inner peripheral surface of the hose and the outer peripheral surface of the inner cylindrical body of the pipe joint are heat-sealed, the melted inner peripheral surface of the hose and the inner cylindrical body are in the middle of fitting the hose to the inner cylindrical body. There is a possibility that the outer peripheral surface of the melted resin may be thermally fused and the hose cannot be fitted to a predetermined position of the inner cylinder. On the other hand, according to claims 3 and 4,
Since the connection end face of the hose and the front end face of the protruding portion of the outer cylinder were melted and the connection end face and the front end face were heat-sealed, there is no fear. According to the sixth and seventh aspects, the hose and the pipe joint, or the hose and the heat insulating material can be thermally fused to the pipe joint by a simple operation, and can be connected and fixed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first example of an embodiment of the present invention.

FIG. 2 is an exploded view of FIG.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a cross-sectional view for explaining the connection method of FIG.

FIG. 5 is a sectional view for explaining the connection method of FIG. 1;

FIG. 6 is a sectional view showing a second example of the embodiment of the present invention.

FIG. 7 is an exploded view of FIG.

FIG. 8 is a sectional view showing a third example of the embodiment of the present invention.

FIG. 9 is an exploded view of FIG.

FIG. 10 is a sectional view showing a comparative example of the present invention.

FIG. 11 is an exploded view of FIG. 11;

[Sign]

 DESCRIPTION OF SYMBOLS 1 Drain hose 1A Connection end face 2 Heat insulation material 2A Connection end face 3 Pipe wall 4 Reinforcement wire 10 Pipe joint 11 Inner cylinder 12 Outer cylinder 16 Protrusion 16A Front end 17 Cover 18, 19 First and second Heating element

Claims (7)

[Claims] 1. A connection structure of a flexible synthetic resin hose and a synthetic resin pipe joint, wherein the hose is a tube wall portion mainly constituting the hose, and a reinforcing wire rod spirally provided on the tube wall portion. In the reinforcing wire, the thickness of the connection side end with the pipe joint is made thinner than other parts, and the end face of the hose on the connection side with the pipe joint and the corresponding surface of the pipe joint are heat-sealed. A connection structure between a hose and a pipe joint, wherein 2. A connection between a hose and a pipe joint according to claim 1, wherein a heat insulating material is externally fitted to the hose, and an end face of the heat insulating material on the connection side with the pipe joint and a corresponding surface of the pipe joint are heat-sealed. Construction. 3. An inner cylinder body in which a pipe joint is opened in the front-rear direction and a hose is connected from the front, and an outer cylinder body coaxially fitted to the inner cylinder body and opened forward is integrally formed. An outer cylinder having a projecting portion projecting radially outward from the inner cylinder, and a tubular cover projecting forward from an outer periphery of the projecting portion; 2. The connection structure of a hose and a pipe joint according to claim 1, wherein an end face on a connection side with the pipe joint and a front end face of the protruding portion are heat-sealed. 4. A connection between a hose and a pipe joint according to claim 3, wherein a heat insulating material is fitted over the hose, and a connecting end face of the heat insulating material to the pipe joint and a front end face of the projecting portion are heat-sealed. Construction. 5. The wall thickness of an end of the pipe wall at the connection side with the pipe joint is larger than the thickness of the other part.
4. The connection structure between the hose and the pipe joint according to any one of 4. 6. A method for connecting a hose and a pipe joint in the connection structure of a hose and a pipe joint according to claim 3, wherein an end surface of the hose on the connection side with the pipe joint is brought into contact with a heating element. The connection-side end face is heated and melted, and at the same time, a cylindrical heating element is inserted into the outer cylinder, and the front end face of the heating element contacts the front end face of the protruding section, and A connection between a hose and a pipe joint, wherein the front end face is melted by being heated, and the molten front end face at the projecting portion and the melted connection side end face of the hose are heat-sealed. Method. 7. The heat-generating element is brought into contact with the hose together with the hose and the heat-insulating material externally fitted to the hose at the connection-side end face of the pipe joint, and the connection-side end face is heated to be melted and heat-insulated. 7. The method for connecting a hose and a pipe joint according to claim 6, wherein the melted connection-side end face of the material and the melted front end face of the projecting portion are heat-fused.