RU2757342C2 - Pressure retention unit - Google Patents

Abstract

FIELD: oil and gas industry.SUBSTANCE: unit is designed to dispense and retain compressed gas pressure at consumer in dispensed cavity. Unit contains valves with electromagnetic control of supply and drainage, as well as auxiliary elements: throttle, sensor or pressure relay. In the design of the first valve there is a draining after itself, the second one is made with a direct action valve and is installed opposite to the flow direction.EFFECT: technical result is higher efficiency of operation and simplified design.1 cl, 1 dwg

Description

The proposed invention relates to devices for issuing compressed gas to the consumer and keeping it in the dispensed cavity, and is primarily intended for controlling pneumatic valves, and can also be used to provide gases to various pneumatically controlled devices, including in leak test circuits for pressure drop.

Known devices for issuing compressed gases for pneumatic clamping with manual control (MM Agranovskiy, ME Vylyudnov and others. Power pneumatic automatic systems. Moscow, 1965, p. 6, Figure 1), containing shut-off elements, pressure regulator (RD) , safety valve (KP), pressure sensor with automatic control by means of electrovalves.

Also well-known is the method of gas delivery to the consumer's system and its drainage using sequentially installed electric-pneumatic supply and drainage valves with possible control of the pressure of the discharged gas using a converter or a pressure sensor.

The closest in technical essence to the proposed invention is a block from the composition of the gas distribution module (Patent RU No. 2593576 C1, F17D 3/00 (pos. 12, 14) - prototype), consisting of a main line with sequentially installed electropneumatic supply and drainage valves, a choke, pressure sensor and outlet fitting.

The disadvantages of the known devices are their limited operational capabilities, namely, due to the design features of the electric-pneumatic dispensing valve, it is impossible to maintain the output pressure in the consumer's system in the absence of gas pressure at the inlet to the device. To provide such a possibility, it is necessary to use a delivery solenoid valve of a more complex design. Also, when using these devices in the schemes for checking consumer systems for leaks by pressure drop, an error is likely due to the impossibility of taking into account the difference in gas flow rates through the discharge EPC and through the drainage EPC arising from leakage along the EPC seat.

The objective of the proposed technical solution is to expand the operational capabilities of the device and increase the efficiency with the same number of units in the circuit and without complicating the design of the units used.

The problem is solved by the fact that in a pressure holding unit containing a compressed gas supply pipeline with a valve with an electromagnetic control of the supply, a valve with an electromagnetic control of drainage, a throttle, a pressure sensor (relay) and an outlet fitting, a valve with an electromagnetic control of the supply of compressed gas has a drain, a solenoid drain valve is installed against the direction of flow. In this case, the solenoid-operated drain valve must be a direct-acting valve.

The author is not aware of technical solutions with essential features listed in the distinctive part of the formula.

The proposed technical solution is illustrated by a drawing, which shows a schematic pneumatic diagram of a pressure retention device.

The pressure holding unit contains the main pipeline for supplying 1 compressed gas with a series-installed valve with electromagnetic control (EK) of supply 2 and EK of drainage (also performing the functions of a check valve) 3, a throttle (if necessary) 4, a pressure sensor (or pressure switch) 5 and outlet fitting 6.

Work description.

Before the gas is discharged into the consumer's system, at the inlet to the device, in the pipeline 1 to the supply EC 2, compressed gas of the required pressure is supplied, while the supply EC 2 is closed, there is no excess pressure behind the supply EC 2.

If it is necessary to deliver gas to the consumer's system, drainage EC 3 and outlet EC 2 are sequentially opened, and compressed gas enters the consumer's system through throttle 4 (if any). The outlet gas pressure is monitored by pressure sensors (or pressure switches) 5.

If it is necessary to hold gas in the consumer's system, drainage EC 3 and outlet EC 2 are sequentially closed, as a result of which the gas is completely vented only between drain EC 3 and outlet EC 2, remaining in the consumer's system. The presence of excessive gas pressure in the pipeline 1 to the supply EK 2 does not affect the ability to retain gas in the consumer's system.

If it is necessary to bleed gas from the consumer's system, drainage EC 3 opens and gas is released through the drainage hole of outlet EC 2 into the drainage header or the environment.

When the device is operating in the circuits for checking the consumer's system for tightness by the pressure drop, the resulting error is determined only by the leakage along the seat of the drainage EC 3 and can be taken into account by installing a gas flow metering device on the drainage hole of the outlet EC 2.

The proposed technical solution allows, in comparison with the known device, to expand the operational capabilities, namely, to ensure the retention of gas of the required pressure in the consumer's system, including in the absence of overpressure gas at the inlet to the device, and to use the proposed device in leak testing schemes according to pressure drop.

Claims (1)

A pressure holding unit containing a compressed gas supply pipeline with a series-installed valve with electromagnetic control of the supply with drainage after itself, a valve with electromagnetic control of a direct drainage action, a throttle, a pressure sensor or a pressure switch and an outlet fitting, while the direct-acting valve is installed against the direction flow.

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