JP2000329284A - Resin joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the cooling time and to increase work efficiency by burying heat pipes welding a body and resin pipe connected sections in the inner periphery of the joint body made of a thermoplastic resin to be inwardly coupled with thermoplastic resin pipes. SOLUTION: End sections of resin pipes 2 are inwardly coupled on both sides of a joint body 1, gas heaters 6 are brought into contact with the end sections of right and left heat pipes 5, and the inner periphery of the body 1 around the heat pipes 5 is heated and softened by the heat. The inner face of the body 1 is temporarily moved inward in the radial direction by the thermal expansion of the body 1, and the inner periphery of the body 1 is brought into contact with the surface section of the resin pipe 2 to transfer heat energy to the resin pipe 2. The surface portion of the resin pipe 2 is softened and thermally expanded in the direction to expand the outer diameter of the resin pipe 2, and the body 1 and the resin pipe 2 are welded together. Ice or Dry ice is brought into contact with the end sections 5a of the right and left heat pipes 5 to quickly cool them. The heat pipes 5 have good heat responsiveness, can transfer a large quantity of heat at a small temperature difference with any heat source, can shorten the cooling time, and can increase work efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a joint body made of a thermoplastic resin for fitting a tube made of a thermoplastic resin therein. The joint body and the resin pipe are provided on an inner peripheral portion of the joint body. The present invention relates to a resin joint in which a heating element that generates thermal energy for welding to a connected portion is embedded.

[0002]

2. Description of the Related Art Conventionally, this type of resin joint has been constructed by embedding a heating wire made of nichrome or an iron chrome alloy as a heating element in a coil shape on an inner peripheral portion of a joint body. Therefore, the heating wire is energized to generate Joule heat, and the generated heat causes the joint body and the connected portion of the resin tube to be melted and joined, and then naturally cooled and fixed.

[0003]

According to the above-described conventional resin joint, the heating wire is energized and heated to weld the joint body and the connected portion of the resin pipe. And it is easily affected by electric resistance and voltage, so that it is difficult to perform uniform heating over the entire connected part of the joint body and the resin pipe, and it is necessary to provide a controller that controls the voltage in order to adjust the temperature of the heating wire. Therefore, when an abnormality occurs in the controller, a disconnection or a power failure occurs, the welding operation cannot be performed. In addition, when the adjacent coils come into contact with each other when the resin of the joint body is melted by the electric heating, there is a concern that a short circuit occurs. Further, the cooling time for cooling and fixing the connected portion between the melted joint body and the resin pipe takes a long time due to natural cooling, and is poor in workability.

[0004] Accordingly, an object of the present invention is to solve the above-mentioned problems, to uniformly heat the entire joint of the joint body and the resin pipe, not to be affected by a power failure, and to melt the resin of the joint body to generate heat. An object of the present invention is to provide a resin joint having a high working efficiency by shortening a cooling time for cooling and fixing a connected portion between a melted joint main body and a resin pipe, while preventing short-circuiting even if the bodies contact each other.

According to a first aspect of the present invention, as shown in FIG. 1, a joint body 1 made of a thermoplastic resin for fitting a pipe 2 made of a thermoplastic resin therein is provided. A resin joint in which a heating element (4) for generating thermal energy for welding the joint body (1) and the connected part (3) of the resin pipe (2) is embedded in an inner peripheral portion of the joint body (1). Is formed by the heat pipe 5.

As shown in FIG. 2, the characteristic structure of the invention according to claim 2 is that the shape of the heat pipe 5 buried in the inner peripheral portion of the joint body 1 is formed in a net tube shape.

The heat pipe 5 is connected to the joint body 1 as shown in FIGS.
A first heat pipe portion 5c formed in a C-shape along an inner peripheral portion of the joint body, and a plurality of first heat pipe portions 5c arranged in parallel along the longitudinal direction of the joint body 1; And the second heat pipe portion 5b which connects them in a communicating state.

As shown in FIG. 6, the first heat pipe 5c connected to the second heat pipe 5b is connected to each of the first heat pipes 5c. The direction of the distal end of the pipe portion 5c is formed in such a manner that adjacent ones have different extending directions in the circumferential direction along the inner peripheral portion of the joint main body 1 and are juxtaposed in the longitudinal direction of the joint main body 1. There is a place.

[0008] As described above, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the accompanying drawings.

[Operation and Effect] According to the first aspect of the present invention,
A joint body made of thermoplastic resin for fitting a tube made of thermoplastic resin inside is provided, and heat energy for welding the joint body and a connected portion of the resin pipe is generated on an inner peripheral portion of the joint body. Since the heat generating element is buried in the heat pipe and the heat generating element is formed by a heat pipe, the workability of welding the joint body and the connected portion of the resin pipe can be improved. In other words, heat pipes have good thermal responsiveness, can transfer a large amount of heat with a small temperature difference regardless of the heat source, and can achieve isothermal temperature distribution throughout the heat pipe. It is possible to heat weld the joint body and the connected portion of the resin pipe only by contacting the heat source without performing the heat treatment. For example, when the heat source is a gas heater and the end of the heat pipe is heated by the gas heater, the connected portion between the joint body and the resin pipe can be heated and melted without using electricity. At this time, the heating temperature can be set according to the type of sealing liquid, the sealing pressure, and the like when the heat pipe is manufactured, so that the heat pipe is manufactured in advance so that the heating temperature is suitable for the use temperature. , And a stable use temperature can be exhibited.
Further, even when adjacent heat pipes come into contact with each other when the resin of the joint body is melted by heating, unlike the heating wire, a short circuit does not occur. Furthermore, when cooling the connected part of the fused joint body and the pipe, only by contacting the cold heat source with the end of the heat pipe, the connected part of the fused joint body and the pipe can be rapidly cooled and solidified. . As a result, the joint body and the entire connected portion of the pipe can be uniformly heated without being affected by a power failure,
Accurate and stable fusion work can be performed without short circuit. In addition, since the fused part can be forcibly cooled, the cooling time can be shortened and the working efficiency can be improved.

According to the second aspect of the present invention, in addition to the effects of the first aspect of the invention, the heat pipe buried in the inner peripheral portion of the joint body is formed in a net tube shape. Therefore, uniform heating can be further performed, the workability of welding the joint body and the connected portion of the resin pipe can be improved, and the strength of the joint body can be increased. In other words, since the heat pipe formed in a mesh shape is tubular and buried in the inner peripheral portion of the joint main body, compared to a coil wrapped and buried in a coil shape,
The strength of the joint body can be increased, and heat can be evenly transmitted vertically and horizontally by the heat pipes arranged in the mesh. As a result, the joint body can be prevented from being deformed, and the connected portion between the joint body and the pipe can be uniformly melted, so that the welding performance can be improved.

According to the third aspect of the present invention, in addition to the effect of the first aspect of the present invention, the heat pipe is formed in a C-shape along an inner peripheral portion of the joint main body. A plurality of first heat pipe portions arranged in parallel along a longitudinal direction of the joint body;
Since each of the heat pipe portions is formed by the second heat pipe portion that connects the heat pipe portions to each other, efficient and uniform heat conduction can be performed. That is, the distance from the heated end of the heat pipe to the end of each of the C-shaped first heat pipes is formed by sequentially extending the heat pipe and winding the heat pipe around the inner periphery of the joint body. Since it can be shorter than the one that
The flow of the sealed liquid sealed in the heat pipe becomes quick, and efficient heat transport can be performed. As a result, the welding performance for welding the joint body and the connected portion of the resin pipe can be improved, and the working efficiency can be improved.

According to the fourth aspect of the present invention, in addition to the effect of the third aspect, it is possible to achieve the same effects as those of the third heat pipe section connected to the second heat pipe section. The direction of the tip of each first heat pipe portion is formed by juxtaposing the joint body in the longitudinal direction of the joint body so that adjacent ones have different extending directions in the circumferential direction along the inner peripheral portion of the joint body. Therefore, uniform heating can be performed quickly. That is, since the heat transport direction in the circumferential direction along the inner peripheral portion of the joint main body in the longitudinal direction of the joint main body is alternated, the entire joint main body can be uniformly heated without uneven heating. As a result, the welding performance can be improved and the working efficiency can be improved.

Embodiments of the present invention will be described below with reference to the drawings. The resin joint T according to the present invention is used for connecting gas pipes such as city gas and propane gas. As shown in FIG. 1, a tubular joint body 1 is formed of a thermoplastic polyethylene resin which can be heat-welded to a resin pipe 2 made of a thermoplastic polyethylene resin (PE), and the joint body 1 is formed. A heating element 4 for generating thermal energy for welding the joint body 1 and the resin pipe 2 is embedded in an inner peripheral portion of the joint body 1.

[0013] The heating element 4 can be connected to the connecting portion 3 of the joint body 1 and the resin pipe 2 simply by bringing a heat source into contact with its end.
And a heat pipe 5 for generating thermal energy capable of thermally welding the tubular joint body 1.
Except for the center part and both ends of the joint main body 1, the left and right inner peripheral parts where the resin pipe 2 to be connected is internally fitted from both left and right sides are independently wound left and right separately in a spiral state. Embedded in state.

As shown in FIGS. 1 and 2, the heat pipe 5 is formed by enclosing a small amount of water in a helically wound ultrafine metal tube in a vacuum state. That is, since water evaporates immediately in a vacuum state, when the gas heater 6 (an example of a heat source) is brought into contact with the end portion 5a of the heat pipe 5 protruding outside the joint body 1, the water in the pipe absorbs heat energy. It evaporates and moves while emitting heat energy in the joint body 1. Since a vertical groove is carved on the inner surface of the metal pipe, liquefied water returns to the end portion 5a of the heat pipe 5 by capillary action after releasing thermal energy, and is evaporated by the gas heater 6. It moves and repeats the release of thermal energy in the joint body 1. In this manner, thermal energy is generated only by contacting the gas heater 6 without energization, and the joint body 1 and the connected portion 3 of the resin pipe 2 can be thermally welded. In addition, heat loss and melting can be prevented by inserting a heat insulating material in the middle of the heat pipe 5, for example, in a portion other than the inner peripheral portion of the joint body 1 where melting is difficult. Further, since the use temperature for heating and melting can be changed depending on the type of the filling liquid to be filled in the metal pipe of the heat pipe 5 or the filling pressure, the use temperature can be set when the heat pipe 5 is manufactured.

Next, a heating step of heat-welding the joint body 1 and the connected portion 3 of the resin pipe 2 by the heat pipe 5,
A cooling process of cooling and fixing the melted joint body 1 and the connected portion 3 of the resin pipe 2 will be described. Such a resin joint 1
The heating process of connecting the resin tube 2 by heat welding using
As shown in FIG. 1, a gas heater 6 as a heat source is brought into contact with each end of each of the left and right heat pipes 5 while maintaining a state in which the ends of the resin pipes 2 are fitted on both sides of the joint body 1. As a result, heat energy is generated, and the heat heats the resin around the heat pipe 5, that is, the inner peripheral portion of the joint body 1 to soften the portion. Then, due to the thermal expansion of the joint body 1, the inner surface of the joint body 1 once moves inward in the radial direction, and the inner peripheral portion of the joint body 1 and the surface portion of the resin pipe 2 come into contact with each other, thereby causing heat. Energy is transmitted to the resin tube 2. When the thermal energy is transmitted, the surface of the resin tube 2 is softened and the resin tube 2 is softened.
The joint body 1 and the resin pipe 2 are welded by thermal expansion in the direction of increasing the outer diameter of the joint. next,
The cooling process for cooling and fixing the welded joint body 1 and the connected portion 3 of the resin pipe 2 is performed by ice or dry ice or the like at the ends 5a of the left and right heat pipes 5 (an example of a cold heat source). , It is possible to cool rapidly, contrary to the heating step.

[Another Embodiment] Another embodiment will be described below. <1> The shape of the heat pipe 5 is not limited to the coil shape described in the above embodiment, and for example, as shown in FIG. Anything is fine. <2> The shape of the heat pipe 5 is not limited to the one formed in the above-mentioned mesh tubular shape, and heat energy is uniformly applied to the joint body and the connected portion of the resin pipe, such as a cross-girder tubular shape and a lattice tubular shape. If possible, its shape is arbitrary. <3> The shape of the heat pipe 5 is not limited to the above-described configuration. For example, a shape in which a heat radiating fin is provided on the outer periphery of the heat pipe may be embedded in the inner peripheral portion of the joint body. In this case, the heat energy is more easily transmitted through the radiation fins, so that the resin is easily melted,
The welding efficiency is improved. <4> The shape of the heat pipe 5 is not limited to the left and right independent shapes described in the above embodiment, and the left and right heat pipes may be integrally formed. With this, the left and right resin pipes can be connected at once. <5> The shape of the heat pipe 5 is not limited to the above-described configuration. For example, as shown in FIGS. 4A and 4B, the heat pipe 5 is formed in a C-shape along the inner peripheral portion of the joint body 1. The first
A plurality of heat pipes 5c are arranged in parallel along the longitudinal direction of the joint main body 1, and a substantially central portion of each of the C-shaped first heat pipes 5c is connected to a heating end 5a. The heat pipe 5 may be formed by being integrally connected in a communicating state by the heat pipe portion 5b. <6> The shape of the heat pipe 5 is not limited to the above-described configuration. For example, as shown in FIGS. 5A and 5B, the heat pipe 5 is formed in a C-shape along the inner peripheral portion of the joint body 1. The first
A plurality of heat pipes 5c are juxtaposed along the longitudinal direction, and one end of each of the C-shaped first heat pipes 5c is connected by a second heat pipe 5b connected to the heating end 5a. The heat pipe 5 may be integrally connected to the state to form the heat pipe 5. <7> The shape of the heat pipe 5 is not limited to the above configuration. For example, as shown in FIG. 6, a first heat pipe portion formed in a C-shape along the inner peripheral portion of the joint body 1 5c are arranged in parallel along the longitudinal direction, and the direction of the tip of each of the first heat pipe portions 5c of the C-shape is
Adjacent members have different extending directions in the circumferential direction along the inner peripheral portion of the joint main body 1, and the other end of each first heat pipe portion 5c is connected to the heating end portion 5a. The heat pipe 5 may be formed by being integrally connected in a communicating state by the second heat pipe portion 5b. <8> The heat source is not limited to the gas heater described in the above embodiment, but may be an electric heater or direct heating using heat from a burner. That is, any heat source that can supply heat energy is used. <9> The use of the heat pipe is not limited to the above configuration, but may be a configuration used only in the cooling step of cooling the heat pipe. Alternatively, it may be used in combination with a heating step by energizing the heat pipe to generate Joule heat by energizing the heat pipe itself. <10> The resin joint is not limited to the one used for the gas pipe described in the above embodiment, and may be, for example, a resin pipe joint for water supply, hot water supply, cooling / heating, and cold / hot water. That is, any fluid piping made of a thermoplastic resin is applicable.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a state in which a resin pipe and a resin joint according to an embodiment of the present invention are assembled and connected.

FIG. 2 is a perspective view of a heat pipe showing an embodiment of the present invention.

FIG. 3 is a perspective view of a heat pipe showing another embodiment.

FIG. 4 is an explanatory view of a heat pipe showing another embodiment.

FIG. 5 is an explanatory view of a heat pipe showing another embodiment.

FIG. 6 is a perspective view of a heat pipe showing another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Joint main body 2 Resin pipe 3 Connected part 4 Heating element 5 Heat pipe 5a Heating end 5b 2nd heat pipe 5c 1st heat pipe

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H019 FA14 GA03 4F211 AA04 AD05 AD12 AD29 AG08 AH11 AK01 TA01 TC11 TD07 TD11 TH06 TN24 TN25 TN28 TN31

Claims (4)

[Claims] 1. A joint body made of thermoplastic resin for fitting a tube made of thermoplastic resin therein, and the joint body and a connected portion of the resin pipe are welded to an inner peripheral portion of the joint body. A resin joint in which a heating element for generating heat energy to be generated is embedded, wherein the heating element is formed by a heat pipe. 2. The resin joint according to claim 1, wherein a shape of the heat pipe buried in an inner peripheral portion of the joint main body is formed in a net tube shape. 3. The heat pipe according to claim 1, wherein the heat pipe is formed in a C-shape along an inner peripheral portion of the joint main body, and a plurality of first heat pipes are arranged in parallel along a longitudinal direction of the joint main body. The resin joint according to claim 1, wherein the resin joint is formed of a first heat pipe portion having a mold shape and a second heat pipe portion connecting each of the first heat pipe portions in a communicating state. 4. The direction of the tip of each of the first heat pipe portions in the plurality of first heat pipe portions connected to the second heat pipe portion in communication with each other, the direction of the end of each of the first heat pipe portions being adjacent to each other. 4. The resin joint according to claim 3, wherein the resin joint is formed so as to extend in a circumferential direction along an inner peripheral portion and to be juxtaposed in a longitudinal direction of the joint main body. 5.