RU227765U1 - Submersible pump unit check valve - Google Patents

Abstract

The utility model relates to petroleum engineering, in particular to the design of a check valve. A check valve of a submersible pumping unit comprises a housing (1) with a through passage (2) of a stepped shape and with a valve pair installed in a larger stage in the form of a seat (3) and a shut-off element (4). In the direction of movement of the working medium in the through passage (2), a spacer sleeve (5) is installed along the thread in the housing (1) with the possibility of fixing the position of the seat (3) relative to the housing (1). The shut-off element (4) is made in the form of a body of revolution, the generatrix of which consists of a large rectilinear (12), conical (13) and small rectilinear (14) sections conjugated with each other, one end (15) of which is made flat, the other - rounded. In the side wall of the spacer sleeve (5) on the end side, longitudinal channels (6) are made in the form of semi-cylinders open inside the sleeve (5). The walls (7) of the said channels serve as guides for the shut-off element (4). Between the seat (3) and the spacer sleeve (5) there is a seal (8) with the possibility of contacting the side surface of the shut-off element (4) at the junction of the large rectilinear (12) and conical (13) sections. The said spacer sleeve (5) is supported by the sleeve (9) of the sludge trap connected to the body (1) by means of a thread (10) with the possibility of fixing it from unscrewing. The end of the spacer sleeve (5) serves as a limiter of the movement of the shut-off element (4). The technical result is achieved - increased reliability and energy efficiency of the valve. 4 sec. fil., 2 fig.

Description

The utility model relates to oil engineering, in particular to the design of a check valve that can be used with rod deep-well or electric centrifugal pumps, designed primarily for pumping liquids with a high content of mechanical impurities.

There are various known solutions for check valves used in the oil producing industry (patents RU 55018, E21B 34/06; RU 56940, E21B 34/06; RU 70544, E21B 34/06; RU 76380, E21B 34/06; RU 83799, E21B 34/06; RU 100579, F16K 15/00.

The disadvantage of known solutions is that when the valve closes, mechanical impurities contained in the pumped liquid worsen the sealing of the shut-off element, preventing it from fitting tightly to the seat. The closest in its technical essence to the utility model is a check valve (patent RU 92086, E21B 34/00, published 10.03.10), having a hollow body with a through channel and a seat installed in it for interaction with a shut-off element, further along the direction of movement of the working medium in the through channel a spacer sleeve is installed with the possibility of fixing the position of the seat by means of a pressure sleeve connected to the body by a thread and having through holes in the end wall, the shut-off element is made in a teardrop shape in the form of a body of revolution with a flat end, the generatrix of the body of revolution consists of a convex, concave, rectilinear and small convex section conjugated with each other, wherein the radii of the convex and concave sections exceed the radius of the small convex section, on the flat end, conjugated along an arc with a spherical surface of a larger radius, a protrusion is made for interaction with the end wall of the pressure sleeve.

The disadvantage of the known valve is the insufficiently high reliability and sealing of the shut-off element seat on the seat, this is due to the possibility of sludge deposition on the surface of the shut-off element and on its path of movement, and, as a consequence, poor quality of its pressing to the seat and low energy efficiency of the submersible pump.

The technical problem, which the proposed utility model is aimed at solving, is to increase the reliability and sealing of the shut-off element and seat pair. When using the utility model, a technical result is achieved concerning an increase in the resource of valve parts and an increase in the energy efficiency of the device as a whole, including the motor resource.

The technical problem is solved and the technical result is achieved due to the fact that the check valve of the submersible pumping unit contains a housing 1 with a through-channel 2 of a stepped shape and with a valve pair installed in a larger stage in the form of a seat 3 and a shut-off element 4, then along the direction of movement of the working medium in the through-channel 2 along the thread in the housing 1 a spacer sleeve 5 is installed with the possibility of fixing the position of the seat 3, while the shut-off element 4 is made in the form of a body of revolution, the generatrix of which consists of a large rectilinear, conical and small rectilinear sections conjugated with each other, wherein one end is made flat, the other is rounded, and in the side wall of the spacer sleeve 5 on the end side longitudinal channels 6 are made in the form of semi-cylinders open inwardly into the sleeve 5, the walls 7 of the said channels 6 serve as guides for the shut-off element 4, a seal is located between the seat 3 and the spacer sleeve 5 8 with the possibility of contact with the side surface of the shut-off element 5 at the junction of the large rectilinear and conical sections, the said spacer sleeve 5 is supported by the sleeve 9 of the sludge trap, connected to the body 1 by means of a thread 10 with the possibility of fixing it from unscrewing, wherein the end of the spacer sleeve 5 serves as a limiter for the movement of the shut-off element 4.

There are also other possible variants of the implementation of the utility model, according to which it is necessary that:

- the seal would be made of fluorosilicone in the form of a ring with an oval cross-section on the side of the shut-off element.

- the mating surface of the large rectilinear and conical sections of the shut-off element 4 would be made with a high degree of purity of its processing for interaction with the surface of the seat 3 to ensure the sealing of the passage channel closure.

- the spacer sleeve 5 would be subjected to heat treatment with the possibility of obtaining a hardness of 30-35 units according to Rockwell to increase wear resistance.

- a damping protrusion 11 in the form of a flattened cylinder would be made on the end of the shut-off element 5.

The essence of the utility model is explained by drawings, where Fig. 1 shows a diagram of a check valve;

Fig. 2 shows a cross-section according to Fig. 1, wherein the structural elements of the patented utility model have the following designations:

1 - body;

2 - passage channel;

3 - saddle;

4 - locking element;

5 - spacer sleeve;

6 - longitudinal channels;

7 - side walls of longitudinal channels 6 of spacer sleeve 5;

8 - seal;

9 - sludge trap bushing;

10 - thread between sleeve 9 of the sludge trap and body 1;

11 - thread between the spacer sleeve and the body;

12 - large straight section of the shut-off element 4;

13 - conical section of shut-off element 4;

14 - small straight section of shut-off element 4;

15 - end face of spacer sleeve 5.

According to the utility model, the check valve of the submersible pumping unit comprises a housing 1 (Fig. 1 and 2) with a through-channel 2 of a stepped shape. In the first stage of the through-channel 2 of the housing 1, a valve pair is installed, made in the form of a seat 3 and a shut-off element 4.

Further along the flow of the working medium in the passage channel 2 along the thread 11 in the body 1, a spacer sleeve 5 is installed with the possibility of fixing the position of the seat 3 relative to the body 1. The shut-off element 4 is made of a complex shape in the form of a body of revolution, the generatrix of which consists of a large rectilinear 12, conical 13 and small rectilinear 14 sections conjugated with each other, wherein one end is made flat, the other is rounded. The conical section, in addition to simplifying the shape, helps to stabilize the axial movement of the shut-off element at the stage of opening the valve.

In the side wall of the spacer sleeve 5, on the side of the flat end, longitudinal channels 6 are made in the form of semi-cylinders, open into the inside of the spacer sleeve 5, wherein the walls 7 of the said channels 6 serve as guides for the shut-off element 4, and between the seat 3 and the spacer sleeve 5, a seal 8 is located with the possibility of contacting with the side surface of the shut-off element 5 at the junction of the large rectilinear 12 and conical 13 sections.

The said spacer sleeve 5 is supported by the sleeve 9 of the sludge trap, connected to the body 1 by means of a thread 10 with the possibility of fixing it from turning out, while the end 15 of the spacer sleeve 5 serves as a limiter for the movement of the shut-off element 4.

The utility model functions as follows. After the submersible pumping unit is switched on, pressure is created at the inlet to the valve in front of the shut-off element 4 (Fig. 1), and it rises above the seat 3, overcoming the elastic forces of the seal 8, its own weight and the weight of the liquid in the well, and moves upward along the open channels until it stops at the end of the spacer sleeve 5, thereby opening a passage for the pumped liquid, including sludge and other solid particles. After the liquid supply is stopped, the shut-off element 4 is lowered, pushed by the pressure of the liquid column through the seal 8 and is fixed in the seat in a strictly defined position, due to the presence of conical and cylindrical side surfaces of the shut-off element 4, oriented relative to the seal 8, which also serves as a means for removing sludge and hard particles from the surface of the shut-off element 4. In this position, the shut-off element 4 reliably closes the passage channel of the valve. The seal 8, tightly pressing against the surface of the shut-off element 4, provides additional retention of the shut-off element and pressing it against the seat. Thus, the use in the design of the check valve of the submersible pumping unit of the seal 8 made of fluoropolymer material, this form of the shut-off element 4, self-adjusting in space relative to the seat 3 and the composite design of the structural elements in space, eliminating the self-unscrewing of the spacer sleeve, increased tightness, increased the service life of the check valve, increased its reliability and energy efficiency during operation.

Claims (5)

1. A check valve for a submersible pumping unit comprising a housing (1) with a through passage (2) of a stepped shape and with a valve pair installed in a larger stage in the form of a seat (3) and a shut-off element (4), further along the direction of movement of the working medium in the through passage (2) along a thread in the housing (1) a spacer sleeve (5) is installed with the possibility of fixing the position of the seat (3) relative to the housing (1), wherein the shut-off element (4) is made in the form of a body of revolution, the generatrix of which consists of a large rectilinear, conical and small rectilinear sections conjugated with each other, wherein one end face is made flat, the other is rounded, in the side wall of the spacer sleeve (5) on the end side longitudinal channels (6) are made in the form of semi-cylinders open inside the sleeve (5), the walls (7) of the said channels (6) serve as guides for the shut-off element (4), between the seat (3) and the spacer sleeve (5) a seal (8) is arranged with the possibility of contacting the side surface of the shut-off element (5) at the junction of the large rectilinear and conical sections, wherein said spacer sleeve (5) is supported by the sleeve (9) of the sludge trap, connected to the body (1) by means of a thread (10) with the possibility of fixing it from unscrewing, and the end of the spacer sleeve (5) serves as a limiter for the movement of the shut-off element (4). 2. The valve according to item 1, characterized in that the seal is made of fluorosilicone in the form of a ring with an oval cross-section on the side of the shut-off element. 3. The valve according to item 1, characterized in that the mating surface of the large rectilinear and conical sections of the shut-off element (4) is made with a high degree of purity of its processing for interaction with the surface of the seat (3) to ensure the sealing of the blocking of the flow channel. 4. The valve according to item 1, characterized in that the spacer sleeve (5) is subjected to heat treatment with the possibility of obtaining a hardness of 30-56 units according to Rockwell. 5. The valve according to item 1, characterized in that a projection in the form of a flattened cylinder is made on the end of the shut-off element (4).

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