JPS60158331A - Leakage testing method of tightly sealed tank for accommodating electric equipment - Google Patents

Abstract

PURPOSE:To make the testing work efficient, by using a core, making the filling space of a medium to be checked small, testing the leakage, thereby shortening the time for the evacuation work and the filling and extracting work of a medium to be checked. CONSTITUTION:A core 9 having a cover plate 8 is inserted into a main body 1 of a tightly sealed tank A. The cover plate 8 is tightened and fixed to a flange 1a of the main body 1 through a packing 3 as a role of a lid by using clamps. Thus sealing is performed. After the core 9 is tightly sealed in the main body 1, evacuation and the filling and compression of a medium to be checked 7 are performed, and the leakage test is conducted. The most part of the inner volume of the main body 1 of the tightly sealed tank A is occupied by the core 9. The medium to be checked 7 is filled in the space formed by the inner surface of the main body 1 and the outer surface to the core 9. Therefore, the required amount of the medium 7 is very small, the time for the evacuation work and the filling and extracting work of the medium 7 can be shortened and the efficiency of the test work can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to improving the efficiency of leak testing of sealed tanks for storing electrical equipment and downsizing test equipment.

[Prior art]

Sealed tanks for storing electrical equipment that contain cooling and insulating fluid are generally manufactured by welding steel plates and have welded connections to radiators and other accessory equipment, so before storing electrical equipment, A leakage test is performed using a verification medium to check for fluid leakage due to defects in these welded parts.

This conventional leakage test will be explained with reference to FIG. In the figure, 1 is the main body of a sealed tank A, and 2 is a lid of the sealed tank.The main body 1 and the lid 2 are tightened with a C clamp 4 via a gasket 3 to seal them. 5 is a valve installed in the main body 1, and 6 is a radiator. In the leak test, after evacuating the inside of the sealed tank A, the verification medium 7 is inserted into the sealed tank A through the valve 5.
Fill it inside and pressurize it.

For this reason, when the volume of the sealed tank A increases, the amount of verification medium 7 used becomes large, and after the test is finished, this verification medium 7 is extracted from the sealed tank A and collected in the recovery tank. In addition to the time required for filling and pressurizing and unloading, sealing the sealed tank A using the product lid 2 prevents leakage if the finishing processes of the main body 1 and the lid 2 do not match, until the two are aligned. There were problems in that the process and work efficiency was poor, such as delays in testing, and the equipment for collecting the verification medium 7 was also large.

[Summary of the invention]

The present invention was made in view of the problems of the conventional test method described above, and uses a core with a top plate, and during testing, the top plate is used as a temporary lid for the sealed tank, and the core is enclosed in the sealed tank. By using a configuration in which the space created by both is filled with verification media and pressurized, it is possible to significantly reduce the amount of verification media used and shorten the test work time compared to conventional methods. This paper proposes a leakage testing method for sealed tanks for storing electrical equipment, which can smooth the process and improve efficiency, and can also reduce the size of the testing equipment.

[Embodiments of the invention]

FIG. 2 shows an intermediate process of an embodiment of the present invention, in which a core 9 having a top plate and a main body cover 8 is used.

That is, the core 9 is inserted into the main body 1 of the sealed tank A, and the top plate 8 is used in place of the lid 2, which is the product, and the gasket 3 is used.
The C-clamp 4 (not shown) tightens and secures the body 1 to the flange 1a of the body 1 through the C-clamp 4. Core 9 inside main body 1
After sealing the container tightly, the container is evacuated and the verification medium 7 is filled and pressurized to perform a leakage test as in the conventional method. In addition, 10 is the part of the hanging odor rack.

The core 9 of this embodiment is a sealed empty tank having an external volume smaller than the internal volume of the main body 1 of the sealed tank A, which is almost similar to the sealed tank A, and can sufficiently withstand the vacuum and pressurization during the test. Has negative pressure resistance and pressure strength. The top plate 8, which serves as the main body cover during the test, is a plate with a larger diameter than the core 9, and may also serve as a cover for the core 9, or may be formed separately and firmly attached to the core 9. It may be something.

In this embodiment, the core 9 occupies most of the internal volume of the main body 1 of the sealed tank A, and the verification medium 7 is filled in the space formed by the inner surface of the main body 1 and the outer surface of the core 9. If the size of the core 9 is determined so that both are close to each other, the verification medium 7
The amount required is significantly smaller.

In this example, although the lid 2 which is a product is not tested, fluid leakage tends to occur on the main body l side, especially at the connection between the radiator 6 made of thin steel plate and the main body 1, and fluid leakage tends to occur on the lid 2 side. Since the probability of leakage occurring is small, this is practically sufficient.

Therefore, in this embodiment, if the main body 1 of the sealed tank under test has been manufactured, it is possible to proceed with the leakage test of the main body 1 even if the lid 2 and the lid 2 are not compatible with each other.

Further, since the core 9 of this embodiment is a hollow tank, it is lightweight and easy to transport and to insert and remove from the main body 1 of the sealed tank A.

In the above embodiment, one core 7 is used, but if the shape of the sealed tank is complicated, it is possible to use one with multiple cores provided on the - top plate. good.

〔Effect of the invention〕

As explained above, the present invention has a configuration in which a leak test is performed by using a core and reducing the space in which the verification medium is filled, thereby making it easier to perform vacuuming work and filling/unloading the verification medium compared to conventional methods. In addition to being able to perform the test in a short time, the amount of verification media used can be significantly reduced, increasing the efficiency of testing work, and the equipment used to collect the verification media can also be made smaller and cheaper. can do.

Furthermore, since the core is equipped with a top plate that serves as a temporary lid for the sealed tank during leakage tests, there is the advantage that testing can be focused on the main body, which is prone to leakage due to the manufacturing process, as it is connected to a radiator, etc. Problems in the process between the product and the lid can also be resolved and efficiency in the testing process can be increased.

[Brief explanation of the drawing]

FIG. 1 is a side view for explaining a conventional leakage test, and FIG. 2 is a side view showing an intermediate process in an embodiment of the present invention. It smells like a picture, I-! Main body of sealed tank, 3--packet, 4-C clamp, 5--valve, 6-radiator, 8
- Top plate, 9 - Core. Agent Masuo Oiwa Figure 2

Claims (1)

[Claims] (]) When performing a leakage test on a sealed tank filled with cooling/insulating fluid, etc. for storing electrical equipment by replacing it with a verification medium, the external volume is smaller than the internal volume of the sealed tank. A core with a top plate that forms a space between it and the inner surface of the tank is enclosed in the sealed tank, and the top plate is enclosed as a temporary lid for the sealed tank, and then the inside of the space is replaced with the verification medium, and after the test is completed. A leakage test method for a sealed tank for housing electrical equipment, which comprises removing the core from the sealed tank.