RU227764U1 - 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 with a step-shaped passageway and a seat installed in a smaller step, and a shut-off element in the form of a ball in the next step. In the direction of movement of the working medium, a spacer sleeve is installed in the passageway with the possibility of fixing the position of the seat relative to the housing. The spacer sleeve is made of two parts and with a seal located between them. The first part is made in the form of a pressure ring with a cross-section of a rectangular trapezoid. The inclined side of the pressure ring is made concave with a curvature corresponding to the curvature of the ball surface. The second part of the spacer sleeve has longitudinal channels in the form of semi-cylinders on the side wall from the end side, open inside the spacer sleeve. The side walls of the said channels serve as guides for the ball. The spacer sleeve is connected to the body by means of a thread and supported by the sludge trap sleeve, connected to the body by means of a thread with the possibility of fixing it from turning out. The end of the spacer sleeve serves as a limiter of the movement of the mentioned ball. The technical result is achieved - increased reliability and energy efficiency of the valve. 3 s.p. fils, 2 figs.

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, sludge and other solid particles 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 a utility model is a check ball valve (patent RU 2653142, F16K 15/04, published 7.05.18), having a hollow cylindrical body with an internal annular projection, a valve pair installed in the body in the form of an annular seat and a ball shut-off element, a limiter of the shut-off element stroke in the form of a cage with through holes for the flow of liquid, an annular elastic element is installed between the seat and the cage, the internal diameter of which does not exceed the diameter of the ball shut-off element, while the seat is installed on one side of the annular projection at the valve inlet, and the elastic element and the cage are on the other side of the annular projection.

The disadvantage of the known valve is the insufficient reliability of the check valve as a whole and the sealing of the ball-seat system in particular - this is due to the possibility during operation (high vibration) of unscrewing the thread of the locking element pressing the seat to the annular protrusion of the body, which does not exclude the destruction of the valve pair due to increased dynamic loads and, as a consequence, a decrease in the sealing of the ball seating area.

The technical problem, which the proposed utility model is aimed at solving, is to increase the reliability and sealing of the shut-off element-seat pair and, as a consequence, the energy efficiency of the submersible pumping unit. 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 seat 3 installed in a smaller step, and in the next step - a shut-off element in the form of a ball 4, then along the direction of movement of the working medium in the through channel 2 a spacer sleeve 5 is installed with the possibility of fixing the position of the seat 3 relative to the housing 1, wherein the spacer sleeve 5 is made of two parts 6 and 7 with a seal 13 located between them, the first part 6 is made in the form of a pressure ring with a cross-section of a rectangular trapezoid, wherein the inclined side of the pressure ring is made concave with a curvature corresponding to the curvature of the surface of the ball, and the second part 7 of the spacer sleeve 5 has on the side wall from the end side longitudinal channels 8 in the form of semi-cylinders open inward into the sleeve 5, side walls 9 the said channels 8 serve as guides for the ball 4, while the spacer sleeve 5 is connected to the body 1 by means of a thread 10 and is supported by the sleeve 11 of the sludge trap, connected to the body 1 by means of a thread 12 with the possibility of fixing it from unscrewing, in addition, the end of the spacer sleeve 5 serves as a limiter for the movement of the ball 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 material in the form of a ring with an oval cross-section on the side of ball 4;

the surface of the ball 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 overlap of the passage channel 2;

spacer sleeve 5 would be heat treated to obtain a hardness of 30-56 Rockwell units.

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 - a ball serving as a locking element;

5 - spacer sleeve;

6 - the first part of the spacer sleeve;

7 - the second part of the spacer sleeve;

8 - longitudinal channels made in the spacer sleeve 5;

9 - side walls of longitudinal channels 8 of spacer sleeve 5;

10 - thread between spacer sleeve 5 and body 1;

11 - sludge trap bushing;

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

13 - seal;

14 - end face

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 (smaller) 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 ball 4, serving as a shut-off element.

Further along the direction of movement of the working medium in the passage channel 2 of the body 1 there is a spacer sleeve 5, made of two parts 6 and 7 with a seal 13 located between them, made in an oval cross-section, in particular, in the form of a semi-ellipse made of fluorosilicone material, ensuring the sealing of the valve pair, as well as cleaning the surface of the ball 4 from sludge. The seal 13 is located in the diametrical plane of the ball 4 when it is positioned in the seat 3 in the "closed" valve mode.

The first part 6 of the spacer sleeve 5 is made in the form of a pressure ring with a cross-section of a rectangular trapezoid, wherein the inclined side of the pressure ring is made concave with a curvature corresponding to the curvature of the surface of the ball 4, and the second part 7 of the spacer sleeve 5 has longitudinal channels 8 on the side wall from the end side in the form of half-cylinders open inwardly of the spacer sleeve 5, wherein the side walls 7 of the said channels 6 serve as guides for the ball 4, and its end 14 serves as a limiter of the movement of the ball 4 in the “open” position of the valve.

A special feature of the design is the installation of the second part 7 of the spacer sleeve 5 in the housing 1 by means of a thread 12 with the possibility of subsequent fixation by the sleeve 11 of the position of the seat 3 relative to the housing 1, which serves as a “lock nut”.

Another feature of the solution is the arrangement between the first 6 and second 7 parts of the spacer sleeve 5 of the seal 13 with the possibility of contact with the surface of the ball 4, fixing it and cleaning it from sludge in order to increase the service life.

The utility model functions as follows.

After switching on the submersible pumping unit, increased pressure is created at the inlet to the valve in front of the shut-off element - ball 4 (Fig. 1), due to which ball 4 rises above seat 3, also overcoming the elastic forces of seal 13, its own weight and the weight of the liquid in the well, and moves upward along the open channels 8 until it stops at end 14 of spacer sleeve 5, thereby completely opening the passage for the pumped liquid. After the pumping unit stops operating and supplying liquid, ball 4 descends under its own weight and the pressure of the liquid column from the well, pushing through seal 13, simultaneously being cleaned of sludge, is fixed in seat 3 in a strictly defined position, caused by the presence of a spherical shape of the shut-off element, oriented in space by seal 13, which also serves as a means of removing sludge and other solid particles from the surface of ball 4. In this position, the ball 4 reliably closes the check valve passage. The seal 13, tightly pressing against the spherical surface of the shut-off element in the equator zone, i.e. in the zone of maximum pressure on the ball 4, provides additional retention of the shut-off element and pressing against the seat 3. Thus, the use in the design of the check valve of the submersible pump unit of a seal made of fluoropolymer material, a spherical shape of the shut-off element, self-aligning in space relative to the seat 3 and a composite design of the structural elements in space, eliminating spontaneous loosening of the threaded connection, increases the service life of the check valve, improves its reliability and energy efficiency during operation.

Claims (4)

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 seat (3) installed in a smaller stage, and in the next one - a shut-off element in the form of a ball (4), then along the direction of movement of the working medium in the through passage (2) a spacer sleeve (5) is installed with the possibility of fixing the position of the seat (3) relative to the housing (1), wherein the spacer sleeve (5) is made of two parts (6) and (7) with a seal (13) located between them (5), the first part (6) is made in the form of a pressure ring with a cross-section of a rectangular trapezoid, wherein the inclined side of the pressure ring is made concave with a curvature corresponding to the curvature of the surface of the ball (4), and the second part (7) of the spacer sleeve (5) has longitudinal channels (8) in the form of semi-cylinders on the side wall from the end side, open inside the spacer sleeve (5), the side walls (9) the said channels (8) serve as guides for the ball (4), wherein the spacer sleeve (5) is connected to the body (1) by means of a thread (10) and supported by the sleeve (11) of the sludge trap, connected to the body (1) by means of a thread (12) with the possibility of fixing it from turning out, and the end of the spacer sleeve (5) serves as a limiter of movement of the said ball (4). 2. The valve according to item 1, characterized in that the seal is made of fluorosilicone material. 3. The valve according to item 1, characterized in that the surface of the ball (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 closure of the passage channel (2). 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.

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