RU2731778C1 - Device for conducting pneumo-vacuum tests of sealed structures - Google Patents

Abstract

FIELD: test technology.

SUBSTANCE: invention relates to the field of pneumatic vacuum tests, namely to systems of pneumo-vacuum tests of sealed structures of space equipment items outside of the pressure gauges. Technical result is achieved by the fact that the device comprises a computer, a matching device and a unit of electropneumatic valves controlled by a computer. Positive effect of device for conducting pneumatic vacuum tests of tight structures consists in possibility of drainage of gases from tested sealed structures; possibility of evacuation of cavities of tight structures by means of external vacuum facilities; possibility of performing operations for dispensing, draining and vacuumizing gases in automatic mode; leakproofness of tested sealed structures.

EFFECT: technical result is possibility to remove gas medium from sealed structure and to vacuumize cavity of sealed structure by means of external vacuum means, to assess tightness of sealed structure by pressure drop, according to algorithm established by program of pneumatic vacuum tests with minimum intervention in testing of maintenance personnel.

1 cl, 3 dwg

Description

The proposal relates to the field of pneumatic vacuum testing, namely to systems for pneumatic vacuum testing of sealed structures of space technology products outside pressure chambers.

Background of the invention:

Currently, there is a need to conduct a full range of tests of sealed structures (for example, tanks for launch vehicles and upper stages), including:

- overpressure check;

- exposure to pressure drop;

- carrying out evacuation;

- gas drainage from sealed structures, etc.

A device for delivering gas at a given pressure is known (patent RU 2322638), which relates to gas technology and is intended for automatic delivery of gas to a consumer at predetermined pressure values.

The reason that prevents the known device from obtaining the technical result, which is provided by the proposed device, is that there is no possibility of draining the gas of a sealed structure and carrying out its evacuation.

The technical objective of the invention is to develop a device for pneumatic vacuum testing of sealed structures, which allows filling the sealed structures with gases, removing the gaseous medium, evacuating, assessing the tightness by the pressure drop, according to the algorithm established by the pneumatic vacuum testing program with minimal intervention in the testing process of the service personnel.

The claimed device for carrying out pneumatic vacuum testing of sealed structures, which is shown in Fig. 1 and FIG. 2, consisting of gas lines (20), a connection to a sealed structure (3), designed to connect a sealed structure, a gas inlet (1), designed to connect cylinders with a working gas, drainage and evacuation fittings (2, 19), intended for connecting external vacuum means and drainage mains, electro-pneumatic valves (4, 9, 10, 12, 14, 17, 18), intended for supplying working gas, supplying gas to the reducer, drainage of gas at the outlet of the reducer, delivery of reduced gas to the manifold , gas delivery for evacuation, gas pressurization and drainage from the product, gas drainage from the delivery manifold, filters (5, 15) for gas purification from mechanical impurities, reducer (7) with a throttle washer (6) designed to improve the characteristics of the reducer, safety valve (8), which provides automatic discharge of gas from the lines in case of excess of the permissible pressure (the valve is set manually and is oak control element of the electro-pneumatic valve (9)), pressure sensors (11, 13, 16) designed to adjust the reducer (7) to a given pressure, control the gas pressure in the delivery manifold and in the cavity of the sealed structure. The electro-pneumatic valves (4, 9, 10, 12, 14, 17, 18) are combined into a block of electro-pneumatic valves (21). The computer (22), through the matching device (23), according to information from the pressure sensors (11, 13, 16), controls the block of electro-pneumatic valves (21).

The device is controlled by a computer according to test programs. The device control algorithm is shown in the block diagram of FIG. 3. Working gas is supplied to the device through the union (1). By opening the electro-pneumatic valves (4, 10), gas is supplied to the inlet of the reducer (7). The reducer (7) is manually loaded to the required pressure, the pressure is controlled by the pressure sensor (11). By opening the electro-pneumatic valve (12), the working gas is supplied to the discharge manifold, the pressure is controlled by the pressure sensor (13). By opening the electro-pneumatic valve (17), through the filter (15), the working gas is supplied to the sealed structure, the pressure is controlled by the pressure sensor (16). If the pressure set in the test program is exceeded, the electro-pneumatic valve (4) closes at the command of the computer, the working gas is drained: when the pressure is exceeded according to the pressure sensor (11), downstream of the reducer through the electro-pneumatic valve (9), in the case of excess pressure according to the pressure sensor (13) in the discharge manifold through the electro-pneumatic valve (18). Drainage of gas from the product is carried out by opening the electro-pneumatic valves (17, 18), the pressure is controlled by the pressure sensor (16). The product is evacuated through a common delivery manifold by an external vacuum device connected to the fitting (2). In this case, the electro-pneumatic valve (14, 17) opens, the electro-pneumatic valve (12) closes, the pressure in the product cavity is monitored by pressure sensors (13, 16).

The technical result of the invention is the ability to remove the gas medium from the sealed structure and to evacuate the cavity of the sealed structure using external vacuum means, to assess the tightness of the sealed structure by the pressure drop, according to the algorithm established by the program for pneumatic vacuum tests with minimal interference in the testing process of the service personnel.

The required technical result is achieved by the fact that the device contains a computer, a matching device, a computer-controlled electro-pneumatic valve block, designed to remove (drain) gas from a sealed structure, as well as to conduct evacuation.

Thus, the positive effect of the device for conducting pneumatic vacuum testing of sealed structures is:

- the possibility of drainage of gases from the tested hermetic structures;

- the possibility of evacuating the cavities of sealed structures using external vacuum means;

- the possibility of carrying out operations of delivery, drainage and evacuation of gases in automatic mode;

- the possibility of checking the tightness of the tested hermetic structures.

1. Shevchuk K.M., Shashlov A.A., Mezentsev D.V., Panarin V.I., Tugolukov V.V. Patent No. 2322638 "Device for dispensing gas at a given pressure".

Claims (1)

A device for pneumatic vacuum testing of sealed structures consists of gas lines, a connection to a sealed structure, a gas inlet, drain and evacuation fittings, electro-pneumatic valves, filters for gas purification from mechanical impurities, a reducer with a throttle washer, a safety valve, pressure sensors and differs from other devices in that it contains a computer, a matching device, a block of electro-pneumatic valves under the control of a computer.

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