RU2819385C1 - Hydro-pneumatic accumulator for increased pressure - Google Patents

Abstract

FIELD: oil, gas and coke-chemical industry.

SUBSTANCE: invention relates to oil and gas industry, in particular to devices maintaining pressure of working medium in devices during works on arrangement and operation of oil and gas well. Hydro-pneumatic accumulator for increased pressure, consisting of a housing closed on both sides with covers, inside of which there is a piston not connected to other elements of the device, dividing the inner cavity of the hydro-pneumatic accumulator into gas and hydraulic cavities, covers are made with flanges that can be pressed to the end of the housing; the piston has sealing circuits in the form of a ring and seals both on the side of the gas cavity and on the side of the hydraulic cavity; the check valve is closed with a cap.

EFFECT: design of a hydraulic-pneumatic accumulator suitable for operation at increased pressure level of the internal medium.

1 cl, 3 dwg

Description

Field of technology

The present invention relates to the oil and gas industry, in particular, to devices that maintain the pressure of the working medium in devices during construction and operation of an oil and gas well.

Prior Art

A hydro-pneumatic accumulator is known from the prior art (patent US 20180010618, publ. 01/11/2018), containing a housing closed on both sides with lids, a piston located in the housing, a gas valve communicating with the gas chamber through a gas channel in the lid, a check valve, located in the gas channel, wherein the check valve is mechanically actuated by the gas valve in an open position in communication with the gas channel.

The disadvantage of this technical solution is that hydraulic-pneumatic accumulators of this design are designed for low pressure and with increased internal pressure there is a high probability of malfunctions in the operation of the device.

The essence of the invention

The technical result achieved by the invention is the creation of a hydraulic-pneumatic accumulator design suitable for operation at an increased level of pressure in the internal environment.

The technical result is achieved due to the fact that in the design of the hydraulic-pneumatic accumulator of the claimed design, the covers have an additional seal along the flat surface of the flanges, the piston has two sealing contours - a seal and a ring on the side of the gas cavity, as well as a seal and a ring on the side of the hydraulic cavity, reverse the valve installed on the gas channel of the lid has a protective cap.

Brief description of drawings

The following description provides a possible, but not the only, embodiment of the device.

The essence of the invention is illustrated by drawings.

In fig. Figure 1 shows a hydro-pneumatic accumulator of the proposed design.

In fig. Figure 2 shows a check valve used in a hydraulic-pneumatic accumulator of the proposed design.

In fig. Figure 3 shows a hydro-pneumatic accumulator according to US patent 20180010618 (publ. 01/11/2018), the closest analogue.

Detailed Description of the Invention

The device is designed to maintain the pressure of the test medium when testing the underwater control module.

The device consists of:

1, 10 - cover;

2 - check valve;

3 - gas channel;

4, 11 - cover flange;

5, 8 - cover seal;

6, 7 - piston seals;

9 - body;

12, 14 - ring;

15 - cap;

16 - ball;

17 - spring;

18 - check valve body.

The operation of the device is illustrated using the example of a version of a hydraulic-pneumatic accumulator for high pressure.

The following is one, but only, version of a hydraulic-pneumatic accumulator for high pressure.

In fig. Figure 1 shows a hydro-pneumatic accumulator of the proposed design.

The housing 9 of the hydro-pneumatic accumulator is closed on both sides by covers 1 and 10, having flanges 4 and 11. A piston 13 moves inside the housing 9, dividing the internal cavity of the hydro-pneumatic accumulator into gas and hydraulic cavities, while the piston 13 has a kinematic connection with the inner surface of the housing 9 and is not connected to other elements of the hydraulic-pneumatic accumulator, moving due to changes in pressure in the gas and hydraulic cavities.

With increased pressure in the internal cavity of the device, the seal occurs due to pressing the seal of the covers 5 and 8 to the mating surface of the housing 9, as well as the plane of the flanges 4 and 11 to the mating plane of the end of the housing 9, the seal of the piston 13 from the side of the gas cavity occurs due to the seal 6 and ring 14, on the side of the hydraulic cavity - seal 7 and ring 12, in this case, seal 7 can be a combined seal based on sealing rings made of wear-resistant composite polymer material with high anti-friction properties, for example coke-filled fluoroplastic, and clamping rings made of elastically deformable oil-resistant material, for example, rubber produced by the domestic company "AGA-ELKONT", another design of the combined seal 7 is possible, which does not affect the achievement of the claimed technical result.

In fig. Figure 2 shows a check valve used in a hydraulic-pneumatic accumulator of the proposed design.

The check valve 2 is made in the form of a nipple pressure gauge of a known design, but can have any other design, for example, in the form of a membrane attached to one side, which does not affect the achievement of the claimed technical result. The check valve body 18 has threads on both sides and a central hole in which a ball 16 is installed, supported by a spring 17. To prevent leakage of the working medium through channel 3, the check valve body 18 is closed with a cap 15. It should be noted that the cap 15 can be attached to the check valve body both using threads and any other method, for example, using a cotter pin, which does not affect the achievement of the claimed technical result.

In fig. Figure 3 shows a hydro-pneumatic accumulator according to patent US20180010618 (published on January 11, 2018), the closest analogue.

The closest analogue according to patent US 20180010618 (publ. 01/11/2018) consists of:

19, 28 - cover;

20 - gas valve;

21 - check valve;

22 - gas channel;

23, 26 - cover seal;

24 - piston seal;

25 - ring;

27 - body;

29 - piston.

The housing 27 of the hydro-pneumatic accumulator is closed on both sides by covers 19 and 28. Inside the housing 27, a piston 29 moves, dividing the internal cavity of the hydro-pneumatic accumulator into gas and hydraulic cavities. When the pressure in the internal cavity of the device increases, the seal occurs by pressing the seal of the covers 23 and 26 to the mating surface of the housing 27, the piston 29 is sealed by the seal 24 and the ring 25. On the gas channel 22, first a check valve 21 is installed, then a gas valve 22, moreover, the check valve 21 opens mechanically due to the operation of the gas valve 22. Obviously, this design of a hydro-pneumatic accumulator is not intended to operate at elevated pressures.

Unlike the closest analogue in the claimed technical solution, covers 1 and 10 are made with flanges 4 and 11, respectively, which makes it possible to prevent the flow of the working medium of the hydraulic-pneumatic accumulator both through the use of seals 5 and 8, and through seals along the flange 4 and 11 (with If necessary, an additional gasket can also be installed between the flange 4 and 11 and the end of the housing 9), the piston 13 is made with two sealing circuits - both on the side of the gas cavity of the hydraulic-pneumatic accumulator (ring 14, seal 6) and on the side of the hydraulic cavity (ring 12, seal 7), check valve 2 is closed with cap 15.

The claimed technical device works like this:

The hydraulic-pneumatic accumulator on the side of the hydraulic cavity is connected through a hole in the cover 10 to the hydraulic system of the main device, which is under a certain pressure; working gas is pumped into the gas cavity through the check valve 2 under a certain pressure so as to balance the piston 13 in a certain position relative to the covers 1 and 10 , check valve 2 is closed by cap 15. When the pressure in the hydraulic system of the main device changes, the piston 13 moves, due to which the change in pressure in the hydraulic system of the main device is damped to eliminate water hammer in the hydraulic system of the main device.

The use of a number of measures in the proposed design, such as making covers 1, 10 with flanges 4, 11, making a piston 13 with two sealing circuits both on the side of the gas cavity of the hydraulic-pneumatic accumulator (ring 14, seal 6) and on the side of the hydraulic cavity ( ring 12, seal 7), the design of a check valve 2 with a cap 15, all this reduces the likelihood of deviations in the operation of the hydraulic-pneumatic accumulator at elevated pressure and makes it possible to achieve the claimed technical result, which consists in creating a design of a hydraulic-pneumatic accumulator suitable for operation at an increased level of pressure internal environment.

Claims (1)

A hydraulic-pneumatic accumulator for high pressure, consisting of a tubular body, closed on both sides with lids, inside which a piston moves, not connected to other elements of the device, dividing the internal cavity of the hydro-pneumatic accumulator into gas and hydraulic cavities and having the ability to move when the pressure in the gas and hydraulic cavities, characterized in that the covers are made with flanges capable of being pressed against the end of the housing, a ring and seal are installed on the piston both from the side of the gas cavity and from the side of the hydraulic cavity, the check valve is closed with a cap.