JPH0718235U - Instrument for leak measurement of piping - Google Patents

Abstract

(57) [Summary] [Purpose] To enable inspection by holding the probe tip at a fixed angle and position with respect to the welding line of the pipe. [Structure] The two boxes 3 and 4 are configured so that their opening surfaces face each other and can be joined with a hinge 7 and a joining metal fitting 8 with the pipe 1 sandwiched therebetween. 1 is provided with a probe insertion opening 9 that is supported at a predetermined position, and the other box 4 is provided with a communication pipe 10 that communicates with the outside air.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a leak measuring instrument for a pipe, which supports a probe of a helium leak detecting device for detecting a leak in a welded portion of the pipe.

[0002]

[Prior art]

 As a method of inspecting for leakage from the welding line of the pipe, fill the inside of the pipe with helium gas, bring the probe tip of the helium leak detector close to the outer surface of the welding line, and inspect for leakage from the welding line depending on the presence or absence of leakage of helium gas. Method is used. In this case, as shown in FIG. 4, an enclosure 16 made of vinyl or the like is attached to the tip of the probe 12, the probe 12 is held by hand along the welding line, and the leak position is detected by making one turn around the tip. Was there.

[0003]

[Problems to be solved by the device]

 In this way, when the tip of the probe 12 is brought close to the welding line of the pipe 1 by hand, the angle between the probe 12 and the pipe 1 and the distance between the tip of the probe 12 and the welding line are constant over the entire circumference of the welding line. It is difficult to keep the temperature at a certain level, and it often varies depending on the inspector, which has been a cause of leakage measurement error.

The present invention has been made in view of the above problems, and provides a leakage measuring instrument for a pipe, which surrounds the welding line of the pipe and holds the tip of the probe at a fixed position with respect to the welding line. The purpose is to

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, it is composed of two frames that form an enclosure surrounding the pipe by being joined to each other with the pipes sandwiched so that the opening faces face each other, and a probe of the helium detection device is provided in one of the frames. A supporting portion for supporting the tip at a predetermined position with respect to the pipe is provided, and further, a communication pipe communicating with the outside air is provided at a position apart from the pipe at one of the frames.

[0006]

[Action]

 The opening faces of the two frames are opposed to each other, and the pipes are sandwiched and connected to each other, thereby forming an enclosure wall through which the pipes penetrate. Since one end of the frame is equipped with a support that supports the tip of the probe at a predetermined position with respect to the pipe that penetrates it, by attaching a probe to this support, the probe tip is connected to the pipe. It has a constant angle and distance. In addition, since the outside air communicates with the inside of the frame by the communication pipe, the inside of the frame is almost atmospheric pressure even if it is sucked from the probe. By sandwiching the pipe with a frame so that the welding line of the pipe is located at the tip of the probe and rotating the frame around the pipe, the tip of the probe makes one revolution with the position kept constant with respect to the welding line. To do. As a result, the inspection can always be performed under the same conditions. In addition, the welding line to be inspected is surrounded by a wall composed of a frame, and the outside air intake position of the communication pipe is a predetermined distance from the pipe, so helium gas does not leak from other welding lines. It is possible not to be affected by such as.

[0007]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a perspective view of a leak measuring instrument for piping of the present embodiment, and FIG. 2 shows a cross-sectional view. The leak measuring instrument 20 is constituted by connecting two sides of the opening surfaces of two boxes 3 and 4 having the same opening surface size with a hinge 7. When the opening surfaces are joined together in the boxes 3 and 4, a cut 5 is provided so that the opening surfaces are integrally joined by sandwiching the pipe 1, and the cut 5 is a half of the pipe 1, that is, 180 °. The dimensions are set so that the pipe 1 in the range can be accommodated. An elastic body such as a rubber sheet 6 is attached to the sides of the opening surface that are in contact with each other and the surface where the opening surface and the piping 1 are in contact with each other so as to enhance the airtightness of the space formed by the two boxes 3 and 4 and the piping 1. I am doing it. A joint fitting 8 is provided on the side opposite to the hinge 7 so that the two boxes 3 and 4 can be joined together with the hinge 7.

One box 3 is provided with a probe insertion opening 9 for attaching the tip of the probe 12 to the sandwiched pipe 1 at a predetermined angle and a predetermined distance. If the probe 12 is provided with a collar 13 and is inserted from the probe insertion opening 9 to the collar 13, the tip of the probe 12 forms a predetermined angle and a predetermined distance with respect to the pipe 1.

A communication pipe 10 is provided at the top of the other box 4. The outside air intake port of the communication pipe 10 is separated from the sandwiched pipe, and is located so as not to suck air near the pipe surface.

FIG. 3 is a diagram showing an apparatus for inspecting a weld line for leaks in a pipe by using a helium leak detection apparatus. The pipe 1 is sandwiched between the two boxes 3 and 4 so that the welding line 2 of the pipe 1 is located at the tip position of the probe 12 shown in FIG. The pipe 1 is filled with helium gas from a cylinder 16 while substituting it with air so as to have a predetermined pressure. A hose 14 connects the helium leak detector 11 and the probe 12. Leak inspection is started in this state. The helium leak detection device 11 sucks the gas around the welding line 2 from the probe 12, and displays the amount of leakage from the helium gas contained therein on the display unit 15. Even if the inside of the leak measuring instrument 20 is sucked from the probe 12, the leak measuring instrument 20 communicates with the outside air through the communication pipe 10, so that the pressure is almost the same as the outside air. By rotating the leak measuring instrument 20 around the pipe 1, the leak position can be confirmed. When a leak has occurred in the welding line 2, the leak measuring instrument 20 is rotated once and the welding point located at the tip of the probe 12 where the helium concentration is maximum is detected as the leak position. . If no leak is detected even after one rotation, the soundness of the welding of the weld line 2 is confirmed.

[0011]

[Effect of device]

 As is apparent from the above description, the present invention is designed to join two frames by sandwiching a pipe having a welding line and enclose the welding line portion with an enclosing wall, and the probe tip with respect to the pipe has a constant angle and a constant distance. Since it is supported by, the occurrence of measurement error can be prevented. Also, since the welding line to be inspected is surrounded, the influence of leakage from other welding lines can be eliminated.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of an example.

FIG. 3 is a diagram showing a welding line leakage inspection device for piping by a helium leakage inspection device.

FIG. 4 is a diagram showing a state of a conventional helium leak inspection for a welding line of piping.

[Explanation of Codes] 1 Piping 2 Welding line 3, 4 Box (frame) 5 Notch 6 Rubber sheet 7 Hinge 8 Joining metal 9 Probe insertion opening (Support) 10 Communication pipe 11 Helium leak detector 12 Probe 13 Collar 14 Rubber hose 15 Display 16 Cylinder 20 Leak measuring instrument

Claims (1)

[Scope of utility model registration request] 1. A frame comprising two frames constituting an enclosure wall surrounding the pipe by being joined to each other with the pipes sandwiched so that the opening faces face each other, and the probe tip of the helium detection device is attached to one of the frames. A pipe is provided with a supporting portion for supporting the pipe at a predetermined position, and a communication pipe communicating with the outside air is provided at a position apart from the pipe on one of the frame bodies. Leak measuring instrument.