CN218324819U

CN218324819U - Check valve with baffle

Info

Publication number: CN218324819U
Application number: CN202222362125.1U
Authority: CN
Inventors: 胡定清
Original assignee: Weiqixin Petroleum Machinery Tianjin Co ltd
Current assignee: Weiqixin Petroleum Machinery Tianjin Co ltd
Priority date: 2022-09-06
Filing date: 2022-09-06
Publication date: 2023-01-17
Anticipated expiration: 2032-09-06

Abstract

The utility model relates to a baffle single current valve, mainly used oily charge pump tubular column well completion etc. of diving. The baffle check valve of the utility model is characterized in that a connecting sleeve, a double male joint and a spring sleeve are sequentially connected between an upper joint and a lower joint, a baffle central tube is sleeved in an inner hole of the double male joint, an outer conical surface step of the baffle central tube is matched with an inner conical surface of the double male joint to form a conical sealing surface, and a liquid outlet is arranged on the side wall of the baffle central tube below the conical sealing surface; the inner hole of the double male connector is provided with a limiting step; the periphery of the baffle central tube is provided with a snap ring, a spring is arranged in an annular space between the baffle central tube and the spring sleeve, the lower end of the baffle central tube is provided with a stop cap, the spring pushes up the double male connector, and the stop cap is pushed down. The utility model discloses a baffle single current valve simple structure, throttle pressure differential is little, long service life.

Description

Check valve with baffle

Technical Field

The utility model belongs to the technical field of the single current valve instrument in the oil field development is in the pit, especially relate to a baffle single current valve, mainly used submersible pump tubular column well completion etc..

Background

In offshore oilfield development, after a self-blowing oil well stops blowing, an electric submersible pump pipe column is generally arranged for well completion production. When power is cut off due to faults or a well is planned to be shut down, the electric submersible pump stops producing, oil and water in an oil pipe can flow back to enter the electric submersible pump, and the electric pump can be possibly broken down. To solve this problem, a check valve is usually installed at the fluid port of the electric pump. Because the electric pump displacement is large, the check valve ball is heavy, and its sealing surface is narrow, the check valve seal tends to fail prematurely. In addition, the difference between the diameter of the check valve ball and the diameter of the overflowing hole is large, so that the throttling pressure difference of the conventional check valve is large, and the service life of the conventional check valve is further shortened.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems, the invention provides the baffle check valve which is reliable in performance, small in throttling pressure difference and long in service life.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a baffle check valve comprises an upper connector and a lower connector, wherein a connecting sleeve, a double male connector and a spring sleeve are sequentially connected between the upper connector and the lower connector in a threaded manner, a baffle central tube is coaxially sleeved in an inner hole of the double male connector, an outer conical surface step is arranged on the upper part of the periphery of the baffle central tube, an inner conical surface is arranged at the upper end of the inner hole of the double male connector, the outer conical surface step and the inner conical surface are mutually matched to form a conical sealing surface, and a liquid outlet hole is formed in the side wall of the baffle central tube below the conical sealing surface; the inner hole of the double male connector is a step hole with a small upper part and a big lower part, and a limit step is formed at the connection part of the step holes; a clamping ring groove is arranged at the part of the periphery of the baffle central tube below the liquid outlet hole, a clamping ring is arranged in the clamping ring groove, and the outer diameter of the clamping ring is between the large diameter and the small diameter of the limiting step; a spring is arranged in an annular space between the baffle central tube and the spring sleeve, and the lower end of the baffle central tube is in threaded connection with a baffle cap; the upper end of the spring is contacted with the lower end face of the double male connector, and the lower end of the spring is contacted with the stop cap.

Furthermore, the side wall of the inner hole of the double male connector is provided with an auxiliary sealing ring, and the auxiliary sealing ring is positioned between the conical sealing surface and the liquid outlet hole. The side wall of the lower part of the baffle central pipe is provided with a sand discharge hole, and the sand discharge hole is positioned above the retaining cap. The middle part of an inner hole of the connecting sleeve is an expanding hole, the transition part at the upper end of the expanding hole is a second conical hole, and the transition part at the lower end of the expanding hole is a third conical hole; the lower part of the upper joint is provided with a first conical hole. Furthermore, the generatrix of the first conical hole is positioned on the extension line of the generatrix of the second conical hole; and the generatrix of the third conical hole is positioned on the extension line of the generatrix of the conical sealing surface.

Compared with the prior art, the utility model has the advantages of:

1. the service life is long. When the oil well is produced, the liquid flow at the lower part pushes the baffle central pipe upwards, the liquid outlet hole is far away from the conical sealing surface, the erosion of the well liquid to the sealing surface can be reduced to the maximum extent, and the service life of the baffle central pipe can be prolonged. An auxiliary sealing ring is arranged below the conical sealing surface, and the auxiliary sealing ring cannot be eroded by well fluid, so that the service life of the tool can be further prolonged.

2. The throttle pressure difference is small. Owing to solved the erosion problem, the utility model discloses the circular cone sealing surface internal and external diameter difference of instrument is little, compares with ordinary steel ball type single current valve, and its overcurrent passageway sectional area that leaves is bigger, therefore throttle pressure differential is littleer, and well liquid is lower to the inside erosion intensity of instrument, has further improved its life.

The technical solution of the present invention is further described with reference to the accompanying drawings and specific embodiments.

Drawings

The present invention will be understood more fully and many of the attendant advantages thereof will be readily appreciated as the same becomes better understood by reference to the following detailed description, when considered in connection with the accompanying drawings, wherein the same reference numerals, when considered in connection with the accompanying drawings, serve to provide a further understanding of the invention and constitute a part of this specification, and wherein the same reference numerals, drawings and similar reference numerals designate corresponding parts in the same or similar parts throughout the several views.

Fig. 1 is a schematic structural diagram of the flapper check valve of the present invention.

In the figure: 1-an upper joint, 2-a connecting sleeve, 3-a baffle central pipe, 4-a liquid outlet hole, 5-a double male joint, 6-a limiting step, 7-a snap ring, 8-a spring, 9-a sand discharge hole, 10-a retaining cap, 11-a spring sleeve, 12-a lower joint, 21-a first conical hole, 22-a second conical hole, 23-a third conical hole, 31-a conical sealing surface and 51-an auxiliary sealing ring.

Detailed Description

In the present specification and claims, the terms "upper" and "lower" refer to the position of the flapper check valve in the use state, with the female thread on the upper side and the male thread on the lower side. When the inside and outside or inside and outside of the pipe are described, the small radius in the radial direction is used as the inside or inside, and the large radius is used as the outside. Sealing rings are arranged in the tool structure where sealing is needed, and are not described one by one below, see the figures.

Referring to fig. 1, the utility model discloses a baffle single current valve, threaded connection adapter sleeve 2, two male joint 5 and spring housing 11 in proper order between top connection 1 and lower clutch 12, the coaxial suit of 3 coaxial suits of baffle center tube are in two male joint 5's hole.

The upper part of the periphery of the baffle central tube 3 is provided with an outer conical surface step, the upper end of the inner hole of the double male connector 5 is provided with an inner conical surface, and the outer conical surface step and the inner conical surface are mutually matched to form a conical sealing surface 31.

Liquid outlet holes 4 are arranged on the side wall of the baffle central tube 3 below the conical sealing surface 31. In order to increase the area of the liquid outlet hole, as shown in the figure, a plurality of strip-shaped loading holes are preferably uniformly distributed along the circumference.

The inner hole of the double male connector 5 is a step hole with a small upper part and a big lower part, and a limit step 6 is formed at the connecting part of the step hole. The major diameter of the limiting step 6 is the diameter of the large hole at the lower part of the inner hole of the double male joint 5, and the minor diameter of the limiting step 6 is the diameter of the small hole at the upper part of the inner hole of the double male joint 5.

The periphery of the baffle central tube 3 is provided with a clamping ring groove below the liquid outlet hole 4, the clamping ring groove is internally provided with a clamping ring 7, and the outer diameter of the clamping ring 7 is between the large diameter and the small diameter of the limiting step. The snap ring 7 goes upward to be clamped at the position of the limiting step 6, so that the upward height of the baffle central tube is limited.

Set up spring 8 in the annular space between baffle center tube 3 and spring housing 11, at baffle center tube lower extreme threaded connection fender cap 10, spring upper end and 5 lower terminal surfaces of two pin joint contact, the spring lower extreme contacts with keeping off the cap.

Further, in order to prolong the service life of the baffle check valve, an auxiliary sealing ring 51 is arranged on the side wall of the inner hole of the double male connector 5, and the auxiliary sealing ring is positioned between the conical sealing surface and the liquid outlet hole.

Furthermore, sand may be produced in the oil well production, sand carried by well fluid may fall into the spring, and in order to remove settled sand, the side wall of the lower part of the baffle central tube 3 is provided with a sand discharge hole 9 which is positioned above the baffle cap.

Furthermore, in order to reduce the erosion of the well fluid to the inside of the tool, the middle part of the inner hole of the connecting sleeve 2 is an expanding hole, the transition part at the upper end of the expanding hole is a second conical hole 22, and the transition part at the lower end of the expanding hole is a third conical hole 23; the lower part of the upper joint 1 is provided with a first conical hole 21.

Furthermore, in order to further reduce the erosion of the inner wall of the tool caused by the flowing of the well fluid through the variable diameter part, the generatrix of the first conical hole is positioned on the extension line of the generatrix of the second conical hole; the generatrix of the third conical hole is located on the extension of the generatrix of the conical sealing surface 31.

Obviously, many modifications and variations of the present invention based on the gist of the present invention will be apparent to those skilled in the art.

Claims

1. A baffle check valve comprises an upper joint and a lower joint, and is characterized in that a connecting sleeve (2), a double male joint (5) and a spring sleeve (11) are sequentially connected between the upper joint and the lower joint in a threaded manner, a baffle central tube (3) is coaxially sleeved in an inner hole of the double male joint, an outer conical surface step is arranged at the upper part of the periphery of the baffle central tube, an inner conical surface is arranged at the upper end of the inner hole of the double male joint, the outer conical surface step and the inner conical surface are mutually matched to form a conical sealing surface (31), and a liquid outlet (4) is formed in the part below the conical sealing surface (31) and positioned on the side wall of the baffle central tube; the inner hole of the double male connector is a step hole with a small upper part and a big lower part, and a limit step (6) is formed at the connecting part of the step holes; a clamping ring groove is arranged at the part of the periphery of the baffle central tube below the liquid outlet hole, a clamping ring (7) is arranged in the clamping ring groove, and the outer diameter of the clamping ring is between the large diameter and the small diameter of the limiting step; a spring (8) is arranged in an annular space between the baffle central tube and the spring sleeve (11), and the lower end of the baffle central tube is in threaded connection with a baffle cap (10); the upper end of the spring is contacted with the lower end face of the double male connector, and the lower end of the spring is contacted with the stop cap.

2. A flapper valve as claimed in claim 1 wherein a secondary seal (51) is provided on the side wall of the internal bore of the dual male connector between the conical sealing surface and the outlet port.

3. A flapper check valve as claimed in claim 1 wherein the lower side wall of the flapper center tube (3) is provided with a sand discharge hole (9) located above the flapper.

4. The flapper check valve as recited in claim 1, characterized in that the middle of the inner hole of the connecting sleeve (2) is a diameter-expanding hole, the transition part of the upper end of the diameter-expanding hole is a second conical hole (22), and the transition part of the lower end of the diameter-expanding hole is a third conical hole (23); the lower part of the upper joint (1) is provided with a first conical hole (21).

5. The flapper check valve as claimed in claim 4, wherein the generatrix of the first conical bore is located on the extension of the generatrix of the second conical bore; and the generatrix of the third conical hole is positioned on the extension line of the generatrix of the conical sealing surface (31).