JP2005238274A - Welding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a maintenance-free apparatus for detecting suspension of water supply, which can be applied even to contaminated cooling water and which can be easily operated because of its simple structure and handling, and also to provide its method. <P>SOLUTION: The welding machine is equipped with a piping water pressure detector in which piping is branched in a piping system, the branched piping is extended upward, and a pressure detector is installed in a manner blocking the terminating end of the piping. Through the flowing of cooling water, the pressure of an air layer formed in the upper part of the branched piping is made equivalent to the pressure of the cooling water at the junction point of the piping. Consequently, by detecting the pressure of the air layer, the pressure of the cooling water can be detected indirectly without touching the cooling water, so that the detection of the suspension of water supply is made possible. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to detection of water pressure in piping in cooling water piping for cooling a welder torch.

  In water-cooled devices, water breakage can cause serious damage to the device due to thermal damage. For this reason, it is considered to detect water breakage by a detection method based on various principles to protect the device, but usually the detection unit or the mechanism for detection is in contact with the cooling water to be detected. As a result, when the cooling water is contaminated water, the water outage detection function is hindered.

  The form which implements the conventional water break detection will be described with reference to FIG. When the contaminated cooling water 3 whose water quality is not controlled flows from the upstream pipe 1 to the downstream pipe 2, the pressure sensing unit 7 of the pressure detector 6 that detects the water pressure causes the contaminated cooling water 3 to pass through. The contact portion of the pressure-sensitive portion 7 is contaminated, and as a result, pressure is not transmitted to the pressure-sensitive portion 7 and detection may not be possible.

  In order to avoid such a detection malfunction, the filter 4 is provided on the upstream side of the pressure detector 6. However, the filter 4 is clogged, and periodic maintenance of the filter 4 is necessary. That work is very difficult.

  Even if the filter 4 is installed and the filter 4 is maintained, contamination of the pressure-sensitive portion 7 proceeds and eventually cannot be detected, and the pressure detector 6 is replaced.

  In addition, the quality and degree of contamination of the cooling water vary from user to destination, it is difficult to quantitatively grasp the water quality and degree of pollution, and it is difficult to specify an appropriate filter 4 according to the degree of contamination. Therefore, it is difficult to install an appropriate filter 4 at the manufacturing stage of the welding machine, and it is often used without the filter 4, and the pressure detector 6 becomes contaminated and cannot be detected. Alternatively, the pressure detector 6 is periodically replaced.

  If it is a non-contact detection method for cooling water, it is possible to detect water breakage stably regardless of the quality of the cooling water. There are detection methods based on various principles as a non-contact water break detection method. There are electrical, temperature-sensitive, microwave, and pressure medium transmission systems, but all of these systems have complicated detection configurations and are difficult to implement.

  For example, in the electric system, there is a method in which an electric circuit is constructed using water as a conductor in the drainage part, the current flowing through the electric circuit is measured, and the water breakage is detected by the change in current due to the water breakage. A controller that discriminates the detected current is required.

Although the pressure detection of the liquid by the pressure medium transmission type shown in FIG. 4 is carried out, it is necessary to manufacture the pressure transmission container 16 in which a diaphragm made of a flexible film is stretched, and it cannot be easily performed. . In actual assembly and operation, the other chamber 22 partitioned first is filled with the pressure transmission medium 15, the pressure gauge main body 14 is attached, and then the pressure transmission container 16 is fixed to the fluid transport pipe 10. Such an accurate procedure is required.
Japanese Utility Model Publication No. 57-177148 Name of invention: Pressure gauge

  As a water failure detection device, a maintenance-free water failure detection method that does not require contact with water and can be used regardless of water quality and pollution level and does not require a filter shall be constructed. In addition, the problem is that its configuration, handling in operation and maintenance are simple and can be easily implemented.

  In order to solve the above problems, an air layer was formed in the pipe along which a pressure equivalent to the water pressure was applied. By detecting the air pressure, it was possible to detect water breakage without contact with water.

  According to the present invention, since the water break detector does not come into contact with the cooling water, the water break detecting function is stably maintained for a long time without being affected by the quality of the cooling water used. If water quality is not a problem in other elements, it is not necessary to provide a filter, and the water pressure detection method of the present invention is maintenance-free.

  Also, the method of implementation is very easy compared to other methods. Compared with the example of the pressure medium transmission system already implemented as shown in FIG. 4, it is not necessary to newly manufacture a special mechanism in the present invention, and a pipe that always uses the material necessary for the production of the branch pipe. Can be used and its construction and implementation are very simple and easy.

  FIG. 2 shows a state before constituting the embodiment of the present invention and flowing the cooling water 3. The branch pipe 8 branched by the pipe joint 5 is extended upward, and the pressure detector 6 is attached so as to close the end. At this time, all the piping is occupied with air.

  In this state, a state in which the cooling water 3 flows from the upstream pipe 1 to the downstream pipe 2 will be described with reference to FIG. Although a part of the cooling water 3 enters the branch pipe 8 due to the water pressure, the intrusion of the cooling water stops at a position where the water pressure and the air pressure are balanced, and the air layer 9 remains above the branch pipe 8. That is, the air pressure in the air layer 9 in this case has the same pressure value as the water pressure that is the object of detection. Therefore, the water breakage can be detected by the method of detecting the air pressure shown in FIG. 1 instead of the conventional water pressure detecting method shown in FIG.

  In the present invention, the method of detecting the air pressure by installing the pressure detector 6 so as to block the end of the branch pipe 8 has been described. However, the end of the branch pipe 8 is closed with a cap or a plug, and the pressure detector 6 is branched. A method of detecting the air pressure by attaching to the range of the air layer 9 other than the end of the pipe 8 may be used.

  Although the present invention has been described for water for the purpose of cooling, the purpose of using water may be for purposes other than cooling, and the fluid may be a liquid other than water.

  In the present invention, the non-contact detection method using the pressure detector has been described for the purpose of detecting water breakage, but it can also be applied to the case of detecting the pressure of liquid fluid for the purpose of monitoring or control other than water breakage detection.

The figure which shows the water flow state of the water break detection mechanism by this invention. The figure which shows the state before water flow of the water break detection mechanism by this invention. The figure which shows the conventional water break detection mechanism. The figure which shows the pressure medium transmission type pressure gauge currently disclosed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upstream piping 2 Downstream piping 3 Cooling water 4 Filter 5 Fitting 6 Pressure detector 7 Pressure sensing part 8 Branch piping 9 Air layer 10 Fluid transport pipe 11 Pressure gauge 12 Fluid to be measured 13 Mounting part 14 Pressure gauge main body 15 Pressure Transmission medium 16 Pressure transmission container 17 Engagement portion 18 Equipment attachment portion 19 Diaphragm 20 Fluid inlet 21 Partitioned one chamber 22 Partitioned other chamber 23 Attachment port 24 Fluid inlet

Claims (6)

In the cooling water piping system for torch cooling, a branch pipe that branches upward in the middle of the pipe and closes its end, an air layer formed above the branch pipe, and the pressure equivalent to the cooling water pressure are equivalent. A welding machine comprising a pipe water pressure detection device that is not in contact with cooling water and is configured by a pressure detector that detects an air layer pressure formed on the upper part of the branch pipe as a pressure.
In the cooling water piping system for torch cooling, the branch pipe branched upward in the middle of the pipe, the air layer formed above the branch pipe, and the pressure equivalent to the pressure of the cooling water, A pipe water pressure detection device that is configured to detect an air layer pressure formed in an upper portion of the pipe and is attached to a pressure detector that is attached so as to close the end of the branch pipe; Features welding machine.
In the cooling water piping system for cooling the torch of the welder, a branch pipe that branches upward in the middle of the pipe and closes the end thereof, an air layer formed above the branch pipe, and the pressure of the cooling water A pipe water pressure detection device that is not in contact with cooling water, and comprises a pressure detector that detects an air layer pressure formed at the upper part of the branch pipe as an equivalent pressure.
In the cooling water piping system for cooling the torch of the welding machine, the piping branched upward in the middle of the piping, the air layer formed above the branch piping, and the pressure equivalent to the cooling water pressure are A pipe water pressure detection device that is not in contact with cooling water, comprising a pressure detector that detects an air layer pressure formed on an upper part of the branch pipe and is attached so as to close the end of the branch pipe. .
In the cooling water piping system for cooling the torch of the welder, the air formed above the branch piping as a pressure equivalent to the pressure of the cooling water and the process of branching upward in the middle of the piping and closing the end thereof A pipe water pressure detection method that is not in contact with the cooling water, comprising a method of detecting a layer pressure with a pressure detector.
In the cooling water piping system for welding machine torch cooling, the process of branching upward in the middle of the piping and the air layer pressure formed above the branch piping as pressure equivalent to the pressure of the cooling water are detected. A pipe water pressure detection method that is non-contact with the cooling water, comprising: a method of detecting with a vessel; and a step of attaching the pressure detector so as to block the end of the branch pipe.

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