CS201742B1 - Testing chamber of the high-pressure electric bushings - Google Patents

Description

The invention relates to a test chamber of high-pressure electrical bushings.

The passages of the electrical signals from the sensors used to check the state and effects of the highly pressurized gaseous and liquid environments need to be subjected to a number of tests prior to incorporation into the control bodies in order to reduce their potential failure in operational condition to an acceptable level. At the same time, the resistance criteria are very strict, especially for the application of grommets in aggressive, toxic, explosive, radioactive and otherwise threatening work safety. The pressure tests of these grommets are usually carried out by temporarily joining the metal bracket of each grommet with a welded or heavily brazed joint with a threaded extension, by means of which it is tightly attached to the head of a test autoclave, often adapted to test multiple grommets. This process has a number of disadvantages. Welding or soldering the grommet holder to the threaded insert is quite lengthy and its result is not always perfect. The resulting heating can damage the bushing itself and in case of leakage of the joint or bushing, the running test must be interrupted, which has an adverse effect on the test process of the other bushings being tested. For testing in an autoclave, a relatively large amount of pressurized medium is required and, after completion of the tests, it is necessary to remove the grommets of the threaded inserts, which may also cause mechanical damage to the grommet itself. The production of bushings directly with threaded inserts is inefficient due to the uncertainty of the bushings' resistance.

203. 742

201 742

Si

The above mentioned drawbacks are eliminated by the test chamber of the high-pressure electrical bushings according to the invention, which consists of a hollow body of the pressure chamber, which is terminated on one side by a connecting throat and on the opposite side by a thread for the union nut. a sliding ring and a bevelled inner edge which is in contact with the sealing O-ring abutting the face of the hollow body and the pressure chamber and threaded onto the holder of the test bushing housed in the pressure chamber cavity. The grommet to be tested is provided with a seal on the side facing the cap methane, which has a coaxial orifice in its body, opening into the connected inspection sleeve and a radial lateral orifice. A slide washer is provided between the slide ring and the bottom of the roll recess in the union nut.

The advantage of the test chamber according to the invention is that the test process is significantly accelerated and the test area is reduced. There is no need to manufacture and attach the test threaded attachments to the grommets, nor the need for an expensive autoclave. The quantity of the test pressure environment is reduced so that the tests are safer. In addition, testing individual bushings will simplify its course and result is more definite. Prior to the test or foam, the bushings are not stressed by the technological process of connecting and removing threaded inserts, nor by the leakage of this connection.

The accompanying drawing shows, in sectional view, an exemplary embodiment of a test chamber of the high-pressure electrical bushings according to the invention.

The stainless steel cylindrical body of the pressure chamber 1 is terminated on one side by a connecting socket 10. on the other side by a thread for a brass union nut 2. On the upper face of the hollow body and the pressure chamber 1 there is a sliding ring 3 made of stainless steel. with an apex angle of 00 [deg.], it touches the rubber O-ring 4, which is threaded onto the cylindrical holder of the test bushing 8. It is advantageous to base the more massive test bushing 8 on the spring 7 located in the cavity of the pressure chamber body 1. During the test, the controlled bushing 8 is supported by teflon seals β in the inner recess of the union nut 2, which bears on the slide pad β ,. The union nut 2 is provided on the one hand with a coaxial borehole passing into the external inspection sleeve 5, where it is possible to identify, for example, not through its own grommets 8 by means of a foaming solution. The O-ring 4, when the grommet 8 is accommodated in the bottom body of the pressure camera, is provided by the muzzle-shaped holes 12 in the side of the union nut 2 to tighten and release it.

The test chamber of the high-pressure electrical bushings according to the invention can be used in the inspection of manufactured bushings and similar components of cylindrical high-pressure teohaics as well as in the functional checks and inspections of the safe operation of these high-pressure elements. Practical experience with its use has confirmed its advantages and advantages described above.

Claims (2)

Test chamber of high-pressure electrical bushings, characterized in that it is formed by a hollow body of a pressure chamber (1), which is terminated on one side by a connecting throat (10) and on the opposite side by a thread for a nut (2) between a sliding ring (3) with a bevelled inner gate which engages the O-ring (4) abutting and facing the hollow body and the pressure chamber (1) and slid onto the test bushing holder (8), in the cavity of the pressure chamber (1) and provided with a seal (8) on the side facing the union nut (2), which has a coaxial opening in its body, opening into the connected inspection sleeve (5) and radial side opening (11); the sliding ring (3) and the bottom of the cylindrical recess in the union nut (2) being able to receive the sliding washer (9). 2. The test chamber of the high-pressure electrical bushings according to claim 1, characterized in that the test bushing (8) is housed in the cavity of the pressure chamber (1) by means of a resilient element (7).