Backflow prevention device for outlet of water injection pump

Abstract

The utility model discloses a backflow prevention device for an outlet of a water injection pump. A valve seat; the valve cover, the valve cover and the valve seat are arranged in the shell, one end of the valve cover extends into the valve seat, an inclined ramp is arranged in the valve cover, and the inclined ramp is arranged on the bottom wall of the valve cover; the valve ball is arranged in the valve cover, and the valve ball abuts against the inclined ramp; and one end of the sealing plug extends into the shell and the valve cover. Through the application of the utility model, the anti-backflow device for the outlet of the water injection pump is provided, the structure is simple, the probability of occurrence of common faults such as spring breakage and deviation blocking can be reduced, and high-pressure water is ensured not to flow back when the pump is stopped, so that the stable operation of a water injection process is ensured; besides, when the device is cleaned or maintained, the whole device does not need to be cut off from the process for related operation, so that the labor intensity and the maintenance cost are reduced, and the water injection production and efficiency are improved.

Description

Technical Field

[0001] This utility model relates to the field of water injection pump technology, and in particular to a water injection pump outlet backflow prevention device. Background Technology

[0002] In traditional water injection processes, check valves, as safety accessories for water injection pumps, primarily prevent high-pressure water backflow when the pump stops, ensuring stable operation of the water injection system. However, many older check valves suffer from design flaws such as valve stem detachment, spring breakage, and non-sealing ball seats, leading to their inability to close properly and causing high-pressure water backflow. This backflow not only causes drastic pressure fluctuations in the water injection network but can also lead to formation fluctuations, sand production, and water injection string failure, severely impacting water injection efficiency and oilfield production. Furthermore, older check valves typically have complex designs, making disassembly and repair impossible. In case of failure, they must be removed from the entire process for replacement, increasing maintenance costs and labor intensity. Utility Model Content

[0003] In view of this, in order to solve the above problems, the purpose of this utility model is to provide a backflow prevention device for a water injection pump outlet, comprising:

[0004] case;

[0005] A valve seat, wherein the valve seat is disposed inside the housing;

[0006] A valve cover is disposed inside the housing and abuts against the housing. One end of the valve cover extends into the valve seat. The inner wall of the valve cover is provided with an inclined ramp, which is disposed on the bottom wall of the valve cover.

[0007] A valve ball, wherein the valve ball is disposed within the valve cover, and the valve ball abuts against the inclined ramp;

[0008] A sealing plug, one end of which extends into the housing and the valve cover.

[0009] In another preferred embodiment, the housing has a water inlet and an opening in the horizontal direction, the water inlet and the opening are respectively located at both ends of the housing, and the water inlet communicates with the opening.

[0010] In another preferred embodiment, both the inlet and the opening are cylindrical, and the diameter of the inlet is smaller than the diameter of the opening.

[0011] In another preferred embodiment, the valve seat includes a first threaded portion and a smooth portion, the first threaded portion being connected to the smooth portion, both the first threaded portion and the smooth portion being disposed within the opening, and both the first threaded portion and the smooth portion abutting against the housing.

[0012] In another preferred embodiment, a first through hole is provided through the first threaded portion, and an internal thread is provided on the inner wall of the first through hole. A second through hole is provided through the smooth portion. The first through hole and the second through hole are connected. The diameter of the second through hole is smaller than the diameter of the first through hole, and the diameter of the second through hole is equal to the diameter of the water inlet.

[0013] In another preferred embodiment, a first external thread is provided on the outer side wall of one end of the valve cover, and the first external thread is disposed in the first through hole.

[0014] In another preferred embodiment, the sealing plug includes a second threaded portion disposed within the opening, the second threaded portion engaging with an internal thread on the inner wall of the housing.

[0015] In another preferred embodiment, the sealing plug further includes an extension that is connected to the second threaded portion and extends into the valve cover.

[0016] In another preferred embodiment, the lower end of the housing is provided with a liquid outlet, which is cylindrical and has an outlet that extends through the housing along the axial direction, and the outlet communicates with the opening.

[0017] The present invention, by adopting the above-mentioned technical solution, has the following positive effects compared with the prior art: By applying the present invention, a backflow prevention device for the outlet of a water injection pump is proposed. Its structure is simple, reducing the probability of common faults such as spring breakage and misalignment jamming, ensuring that high-pressure water will not flow back when the pump is stopped, thereby guaranteeing the stable operation of the water injection process. Furthermore, by simply opening the sealing plug, operators can easily clean the dirt on the valve ball and valve seat, or replace damaged parts, without having to cut the entire device out of the process for cleaning or repair. This helps reduce labor intensity and maintenance costs, and improves the efficiency and effectiveness of water injection production. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a water injection pump outlet anti-backflow device according to the present invention;

[0019] Figure 2 This is an exploded schematic diagram of a water injection pump outlet anti-backflow device according to the present invention.

[0020] In the attached image:

[0021] 1. Shell; 2. Valve seat; 3. Valve cover; 4. Valve ball; 5. Sealing plug; 11. Inlet; 12. Outlet; 121. Outlet; 21. First threaded part; 22. Smooth part; 31. Inclined ramp; 51. Second threaded part; 52. Extension. Detailed Implementation

[0022] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "front", "back", "horizontal", and "vertical" are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0024] It should be noted that the terms "horizontal" and "vertical" in this utility model are used to describe approximate positional relationships, and not strictly "horizontal plane" or "vertical plane".

[0025] like Figure 1-2 As shown, a preferred embodiment of a water injection pump outlet backflow prevention device is illustrated, comprising:

[0026] Casing 1;

[0027] Valve seat 2 is located inside the housing 1;

[0028] A valve cover 3 is disposed inside the housing 1 and abuts against the housing 1. One end of the valve cover 3 extends into the valve seat 2. An inclined ramp 31 is provided on the inner wall of the valve cover 3. The inclined ramp 31 is provided on the bottom wall of the valve cover 3.

[0029] A valve ball 4 is installed inside a valve cover 3, and the valve ball 4 abuts against the inclined ramp 31;

[0030] The sealing plug 5 has one end extending into the housing 1 and the valve cover 3.

[0031] Furthermore, as a preferred embodiment, the housing 1 has a water inlet 11 and an opening in the horizontal direction. The water inlet 11 and the opening are respectively located at both ends of the housing 1, and the water inlet 11 is connected to the opening.

[0032] Furthermore, in a preferred embodiment, both the inlet 11 and the opening are cylindrical, with the diameter of the inlet 11 being smaller than the diameter of the opening.

[0033] Furthermore, as a preferred embodiment, the inclination angle of the inclined ramp 31 is preferably set to 4.5°. The height of the end of the inclined ramp 31 near the inlet 11 is less than the height of the end of the inclined ramp 31 away from the inlet 11, so that the valve ball 4 can roll along the inclined ramp 31. When water enters, the water flow will impact the valve ball 4, causing the valve ball 4 to move towards the height of the inclined ramp 31. After moving a certain distance, the valve ball 4 will be clamped by the inner wall of the valve cover 3. At this time, the valve ball 4 will no longer move, and the water flow can be discharged from the outlet 121. After the water flow stops, the valve ball 4 will roll towards the lower part of the inclined ramp 31 under its own gravity, thereby blocking the inlet 11.

[0034] Furthermore, as a preferred embodiment, the valve seat 2 includes: a first threaded portion 21 and a smooth portion 22, the first threaded portion 21 and the smooth portion 22 are connected, the first threaded portion 21 and the smooth portion 22 are both disposed in the opening, and the first threaded portion 21 and the smooth portion 22 abut against the housing 1.

[0035] Furthermore, in a preferred embodiment, the outer walls of the first threaded portion 21 and the smooth portion 22 abut against the inner wall of the housing 1. The outer wall of the smooth portion 22 is provided with a plurality of annular mounting grooves, and a sealing ring is provided in the mounting grooves, so that a sealing effect is achieved between the smooth portion 22 and the inner wall of the housing 1.

[0036] Furthermore, as a preferred embodiment, a first through hole is provided through the first threaded portion 21, and an internal thread is provided on the inner wall of the first through hole. A second through hole is provided through the smooth portion 22, and the first through hole and the second through hole are connected. The diameter of the second through hole is smaller than the diameter of the first through hole, and the diameter of the second through hole is equal to the diameter of the water inlet 11.

[0037] Furthermore, as a preferred embodiment, a first external thread is provided on the outer wall of one end of the valve cover 3. The first external thread is disposed in the first through hole and engages with the internal thread on the inner wall of the first through hole. When one end of the valve cover 3 enters the first through hole, the end face of one end of the valve cover 3 can abut against the inner wall of the first through hole near the second through hole.

[0038] Furthermore, as a preferred embodiment, the sealing plug 5 includes: a second threaded portion 51, which is disposed in the opening and engages with the internal thread on the inner wall of the housing 1; the outer wall of the second threaded portion 51 has an external thread that engages with the internal thread on the inner wall of the housing 1.

[0039] Furthermore, as a preferred embodiment, the sealing plug 5 also includes an extension 52, which is connected to the second threaded portion 51 and extends into the valve cover 3.

[0040] Furthermore, as a preferred embodiment, the inner wall of the valve cover 3 is provided with a limiting surface, and the end face of the extension 52 abuts against the limiting surface, making the valve cover 3 more stable after installation and preventing the valve cover 3 from becoming loose or shaking.

[0041] Furthermore, as a preferred embodiment, the lower end of the housing 1 is provided with a liquid outlet 12, which is cylindrical in shape. The liquid outlet 12 is provided with a liquid outlet 121 through the axial direction. The liquid outlet 121 is connected to the opening and is connected to the water inlet 11 through the opening.

[0042] Furthermore, as a preferred embodiment, the sealing plug 5 is disposed at one end of the opening. The sealing plug 5 provides a one-way seal to the opening, so that after the high-pressure water flows into the opening from the inlet 11, it can only flow out along the outlet 121, and cannot flow out from one end of the opening along the extension direction of the opening.

[0043] The working principle of this utility model is as follows: When the water injection well stops injecting water for any reason, the valve ball 4 will move along the inclined ramp 31 towards the inlet 11 under its own weight and the back pressure of the water injection pipeline until the valve ball 4 partially extends out of the valve cover 3 and enters the second through hole. The outer surface of the valve ball 4 abuts against the inner wall of the second through hole. At this time, under the action of the valve ball 4, the opening and the liquid outlet 121 are not connected to the inlet 11, and the high-pressure water located in the opening, the liquid outlet 121 and the valve cover 3 cannot flow back to the inlet 11. When the water injection well is working normally, under the action of the water flow in the inlet 11, the valve ball 4 will move along the inclined ramp 31 towards the sealing plug 5 until the valve ball 4 abuts against the sealing plug 5. The high-pressure water can enter the opening from the inlet 11 and then flow out through the liquid outlet 121.

[0044] The above description is only a preferred embodiment of the present utility model and does not limit the implementation method and protection scope of the present utility model. Those skilled in the art should realize that all solutions obtained by equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A backflow prevention device for the outlet of a water injection pump, characterized in that, include: case; A valve seat, wherein the valve seat is disposed inside the housing; A valve cover is disposed inside the housing and abuts against the housing. One end of the valve cover extends into the valve seat. The inner wall of the valve cover is provided with an inclined ramp, which is disposed on the bottom wall of the valve cover. A valve ball, wherein the valve ball is disposed within the valve cover, and the valve ball abuts against the inclined ramp; A sealing plug, one end of which extends into the housing and the valve cover.

2. The backflow prevention device at the outlet of the water injection pump according to claim 1, characterized in that, The shell has a water inlet and an opening in the horizontal direction. The water inlet and the opening are respectively located at both ends of the shell, and the water inlet and the opening are connected.

3. The backflow prevention device at the outlet of the water injection pump according to claim 2, characterized in that, Both the inlet and the opening are cylindrical, with the diameter of the inlet being smaller than the diameter of the opening.

4. The backflow prevention device at the outlet of the water injection pump according to claim 2, characterized in that, The valve seat includes a first threaded portion and a smooth portion, the first threaded portion being connected to the smooth portion, both the first threaded portion and the smooth portion being disposed within the opening, and both the first threaded portion and the smooth portion abutting against the housing.

5. The backflow prevention device at the outlet of the water injection pump according to claim 4, characterized in that, A first through hole is provided through the first threaded part, and an internal thread is provided on the inner wall of the first through hole. A second through hole is provided through the smooth part. The first through hole and the second through hole are connected. The diameter of the second through hole is smaller than the diameter of the first through hole. The diameter of the second through hole is equal to the diameter of the water inlet.

6. The backflow prevention device at the outlet of the water injection pump according to claim 5, characterized in that, The outer side wall of one end of the valve cover is provided with a first external thread, which is located inside the first through hole.

7. The backflow prevention device at the outlet of the water injection pump according to claim 2, characterized in that, The sealing plug includes a second threaded portion, which is disposed within the opening and engages with an internal thread on the inner wall of the housing.

8. The backflow prevention device at the outlet of the water injection pump according to claim 7, characterized in that, The sealing plug further includes an extension portion connected to the second threaded portion, the extension portion extending into the valve cover.

9. The backflow prevention device at the outlet of the water injection pump according to claim 2, characterized in that, The lower end of the shell is provided with a liquid outlet, which is cylindrical in shape and has an outlet that extends through the axial direction. The outlet is connected to the opening.

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