JPH0247492Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a gas inspection hood used as a windshield when testing a gas leak detector with an inspection support rod of an inspection gas generator.

The gas generated by the inspection gas generator is continuously sent to the inspection port of the gas leak detector through a support rod for inspection at a gas concentration 1/4 of the lower explosive limit to check whether it is working reliably. Used to confirm.

An example of such an inspection gas generator is shown in FIG.

In FIG. 1, 10 is a main body of the inspection gas generator, which has a gas inlet 11 and a gas outlet 12.
Furthermore, it is provided with a gas concentration indicator 13, a flow control valve 14, a zero regulator 15, a range switch 16, and the like.
Reference numeral 17 denotes a gas source, which has a container containing gas therein, from which gas is supplied to the gas inlet 11 of the inspection gas generator main body 10 through a rubber tube 18. 1
9 is a rubber tube attached to the gas outlet 12; 2;
0 is a support rod for inspection, which has a gas outlet 21 at its tip, and is connected to the inspection gas generator main body 1 through a rubber tube 19.
0 gas outlet 12, and sends out gas diluted to a specified concentration from the gas outlet 21 to the inspection port B of the gas leak detector A, which is the test object.

Figure 2 is an enlarged view of the gas outlet 21 in Figure 1, with 22 being a support pipe, 23
24 is a rubber pipe serving as a gas passage, and 24 is the pipe 2.
A mounting plate 25 formed opposite to each other on both sides of the gas outlet 21 is the gas outlet body of the gas outlet 21, and an annular body 25a (not shown) made of sponge is attached to the tip of the attachment plate 25 for detecting gas leakage. After making contact with inspection port B of device A, press it tightly. A support plate 26 supports the gas outlet main body 25, and is rotatably locked to the mounting plate 24 by a pin 27.

When in use, the support plate 26 of the gas outlet 21 is rotated and the gas outlet body 25 is brought into contact with the inspection port B of the gas leak detector A for inspection. There are also openings for ventilation.

Therefore, when testing when the wind is strong, the concentration of gas inside the gas leak detector A changes depending on the wind blowing on the gas leak detector A, and the gas leak detector A operates at the specified gas concentration. There was a drawback that it was not possible to check whether the

This idea was made in order to eliminate the above-mentioned drawbacks.A hood made of a soft transparent sheet that can be expanded, contracted, and bent is attached to the tip of the gas outlet body to cover the entire gas leak detector. This prevents the flow of air from ventilation openings other than the inspection opening, thereby preventing the inspection gas that has entered the inspection opening of the gas leak detector from being scattered by the wind and becoming diluted. It is. This idea will be explained below.

Figure 3 shows an example of this invention.
0 is a hood for gas inspection, 31 is the hood 30
32 is a ring provided at one end of the sheet 31 to form the hood 30; 33 is a spiral ring stretched over the inner surface of the sheet 31 to make the hood 30 stretchable and bendable; For the spring, an elastic wire such as piano wire with a diameter of 0.5 mm to 1 mm is used. Reference numeral 34 denotes an end plate provided on the other end side of the hood 30, and is made of a transparent and hard material. 35 is the end plate 34
The gas ejection port main body 25 is fitted at a position corresponding to the inspection port B, and the annular body 25a is a gas introduction port into which the annular body 25a is fitted. Note that the other side of the hood 30 is an opening 36.

In use, when testing the gas leak detector A as shown in FIG. 4, grip the pipe 22,
The gas outlet main body 25 of the gas outlet 21 is connected to the hood 3.
The annular body 25a at the tip of the gas outlet main body 25 is brought into contact with the gas leak detector A, and the gas outlet main body 25 and the inspection port B are brought into close contact. The support plate 26 is rotated, the hood 30 is expanded, contracted, and bent to cover the entire gas leak detector A over the opening 36 and come into close contact with the wall surface, and then the inspection gas is ejected. The ejected inspection gas is sent to the gas ejection port body 25.
The gas leak detector A is inspected by directly entering the inspection port B.

Note that the gas outlet main body 25 and the gas inlet 35 can be fixed together by fitting or by using a fastening fitting or the like.

As explained above, this invention forms a hood that can expand, contract, and bend freely using a spiral spring stretched on the inner surface of a transparent sheet, and the gas outlet body of the inspection gas generator is fitted into the end plate of the hood. Since the hood can be placed over the entire gas leak detector after the gas outlet body and gas inlet are brought into close contact with each other, the inspection gas will not scatter and become diluted even if there is a wind blowing outside the hood. The air pressure inside the gas leak detector A is always maintained at a constant inspection gas concentration. Therefore, the gas leak detector can be accurately inspected. Additionally, since the hood is made of a transparent sheet, the condition inside the hood can be clearly seen even when the hood is placed over the gas leak detector. Furthermore, the spiral spring tensioned inside the hood allows the hood to be expanded, contracted, and bent, so there are no restrictions on the position or angle at which you can perform inspection operations by holding the support rod for inspection. It has the following advantages.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the external appearance of the inspection gas generator, Fig. 2 is an enlarged perspective view of the gas outlet in Fig. 1, and Fig. 3 is an illustration showing an embodiment of the invention. FIG. 4 is a partially cutaway side view and a perspective view showing the state in which the gas inspection hood of this invention is used. In the figure, 20 is a support rod, 21 is a gas outlet, 22
is a pipe, 23 is a rubber tube, 24 is a mounting plate, 25 is a gas outlet body, 26 is a support plate, 27 is a pin, 3
0 is the hood, 31 is the seat, 32 is the ring, 33
34 is a spring, 34 is an end plate, 35 is a gas inlet, 36 is an opening, A is a gas leak detector, and B is an inspection port.

Claims (1)

[Scope of utility model registration request] A cylindrical hood that covers the entire gas leak detector is formed using a soft and transparent sheet, one end of this hood is closed with an end plate, and a test gas generator that comes into contact with the inspection port of the gas leak detector is attached to this end plate. A hood for gas inspection, characterized in that a gas inlet is provided to bring the gas outlet body into close contact with the hood, and a spiral spring is attached to the inner peripheral surface of the hood to stretch the hood so that the hood can be expanded, contracted, and bent.