Excess temperature detection method and fluid control equipment in tubing soldering

Abstract

The present invention relates to an excess temperature detection method and a set of fluid control equipment in tubing soldering. When soldering is performed for a joint (2) and tubing (10) of an electric valve (100), whether the heat in soldering affects the components in a body part (1) can be easily determined through a simple structure. An indicator (3) is provided at a root part at a body part (1) side of the joint (2) through a mode of covering the full periphery of the joint (2). The indicator (3) is formed by the synthetic resin as thermoplastic component. While the body part (1) and the indicator (3) are cooled, soldering is performed for the joint (2) and the tubing (10). After soldering, deformation, metamorphosis, etc. of the indicator (3) are confirmed through vision. The indicator (3) can be a cylindrical component, a component which is provided with a plurality of cross grooves on the cylindrical shape, a component which is provided with a plurality of longitudinal grooves on the cylindrical shape, or an annular component. Furthermore the excess indicator can be a clamp-shaped or grid-shaped component. The excessive temperature detection method and the fluid control equipment in tubing soldering can be used for four-way switch valve and electromagnetic valve.

Description

technical field [0001] The present invention relates to a method for detecting excess temperature during brazing of pipes and a fluid control device for detecting excess temperature when brazing is used to detect excess temperature in a fluid control device installed in a circuit of a fluid circulation system such as a valve device and a pipe of the system . Background technique [0002] Conventionally, as a method of joining fluid control equipment such as a valve device to piping in a fluid circulation system, there are many methods of brazing joints of equipment and piping. The brazing work is performed by applying heat over 3000°C to the front end of the joint tens of mm away from the main body of the fluid control equipment when acetylene gas welding is performed, but at this time there is a possibility that the function of the fluid control equipment will be significantly damaged. . For example, thermal deformation of components inside the main body of the fluid cont...

AI Technical Summary

Problems solved by technology

In this brazing operation, the main body of the valve unit is usually cooled, however, there may be cases where heat is transferred to the inside of the main body through the joint due to some malfunction.

[0009] However, in the case where heat transfer occurs in a part of the joint, as far as the method of using the temperature-indicating member or the temperature-indicating paint of the above-mentioned Patent Documents 1 to 3 is concerned, if there is a temperature-indicating member or the like in a part of the joint where heat transfer does not occur, it cannot be detected. its heat transfer

Furthermore, in the temperature-indicating members and temperature-indicating paints of Patent Documents 1 to 3, although the temperature itself can be judged, there is a problem that labor and time are required to set the detected temperature and the like.

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