Electric submersible pump sealing structure with high stability

Abstract

The utility model discloses an electric submersible pump sealing structure with high stability, which comprises a sealing sleeve, an annular air bag is filled in the center of an inner cavity of the sealing sleeve, the inside of the air bag is hollow, an air injection pipe is fixedly welded on the outer wall of the sealing sleeve, the air injection pipe is communicated with the inner space of the air bag, and the air injection pipe is communicated with the inner space of the air bag. A pipe cap is installed on the air injection pipe in a threaded mode, a metal protection plate is horizontally placed on the top wall of the air bag, the inner side of the air bag is filled with an annular gasket in an annular design, and during actual installation, the annular gasket makes direct contact with the electric submersible pump, so that the air bag is prevented from being abraded by the electric submersible pump, and the service life of the electric submersible pump is prolonged. The two ends of the sealing casing pipe extend outwards to form protruding bases, and containing grooves are formed in the inner side space of the sealing casing pipe towards the interiors of the two protruding bases. According to the electric submersible pump sealing structure with high stability, the air bag can completely fill a gap between the electric submersible pump and the sealing sleeve, so that the sealing structure has good and stable sealing performance.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil extraction, and particularly relates to a submersible electric pump sealing structure with high stability. Background Art

[0002] A submersible electric pump is a multi-stage centrifugal pump working underground. It is lowered into the well together with the tubing. The ground power supply transmits electrical energy to the submersible downhole motor through a transformer, a control panel and a power cable, so that the submersible downhole motor drives the multi-stage centrifugal pump to rotate, converts electrical energy into mechanical energy, and lifts the well fluid in the oil well to the ground.

[0003] In the process of implementing the present utility model, the inventor found that at least the following problems exist in this technology: when installing a submersible electric pump, a corresponding sealing structure is required to fix and seal the end of the submersible electric pump. However, for the current sealing structure, it seals by filling objects such as rubber gaskets, but it cannot ensure that objects such as rubber gaskets are in close contact with the submersible electric pump, thus the sealing performance cannot be guaranteed.

[0004] Therefore, we propose a submersible electric pump sealing structure with high stability to solve the above problems. Content of the Utility Model

[0005] The main purpose of the present utility model is to provide a submersible electric pump sealing structure with high stability, so that the airbag can completely fill the gap between the submersible electric pump and the sealing sleeve, enabling the sealing structure to have good and stable sealing performance, and effectively solving the problems in the background art.

[0006] In order to achieve the above purpose, the present utility model adopts the following technical solutions:

[0007] A submersible electric pump sealing structure with high stability includes a sealing sleeve. An annular airbag is filled at the center of the inner cavity of the sealing sleeve, and the inside of the airbag is designed to be hollow;

[0008] An air injection pipe is fixedly welded to the outer wall of the sealing sleeve, and the air injection pipe is communicated with the internal space of the airbag. A pipe cap is threadedly installed on the air injection pipe, and a metal protection plate is horizontally placed on the top wall of the airbag.

[0009] As a preferred implementation scheme, an annular gasket is filled inside the airbag; during actual installation, the annular gasket is in direct contact with the submersible electric pump, thus avoiding the airbag from being worn by the submersible electric pump.

[0010] As a preferred implementation scheme, convex seats extend outward from both ends of the sealing sleeve, and storage grooves are opened in the inner space of the sealing sleeve and extend into the two convex seats; and the two storage grooves are symmetric on both sides of the sealing sleeve.

[0011] As a preferred embodiment, springs and fixed elastic pieces are provided in both of the two receiving grooves. The springs are horizontally designed, and two ends of each spring are fixedly connected to the protruding seat and the fixed elastic piece respectively, so that the fixed elastic piece has a certain elasticity under the action of the spring.

[0012] As a preferred embodiment, the fixed elastic piece is attached to the inner wall of the receiving groove, and the two fixed elastic pieces are both in contact with the metal protection plate, so that the two fixed elastic pieces can limit the position of the metal protection plate, thereby limiting the position of the airbag and ensuring the stability of the airbag during long-term use.

[0013] In summary, the technical effects and advantages of the present utility model are as follows:

[0014] For the submersible motor pump sealing structure with high stability, by injecting inert gas into the injection pipe through an external air pump, the airbag can be filled and extruded against the submersible motor pump inside the sealing sleeve through the annular gasket, so that the airbag can completely fill the gap between the submersible motor pump and the sealing sleeve, making the sealing structure have good and stable sealing performance.

[0015] For the submersible motor pump sealing structure with high stability, by moving the two fixed elastic pieces driven by the two springs to the top of the metal protection plate and making them in contact with the metal protection plate, the metal protection plate can be fixed, so that the airbag remains stable inside the filling groove, ensuring the stability of the airbag during long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural view of the present utility model from a top view perspective;

[0017] Figure 2 It is a schematic structural view of the present utility model from a bottom view perspective;

[0018] Figure 3 For the present utility model Figure 1 The cross-sectional view taken along line A-A in the present utility model.

[0019] In the figure: 1, sealing sleeve; 2, injection pipe; 3, pipe cap; 4, airbag; 5, annular gasket; 6, metal protection plate; 7, protruding seat; 8, receiving groove; 9, spring; 10, fixed elastic piece. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0021] Referring to Figures 1 - 3, A submersible electric pump sealing structure with high stability, including a sealing sleeve 1. An annular airbag 4 is filled at the center of the inner cavity of the sealing sleeve 1. The inside of the airbag 4 is hollow, so that the internal space of the airbag 4 can accommodate inert gas and remain stable. An air injection pipe 2 is fixedly welded to the outer wall of the sealing sleeve 1, and the air injection pipe 2 communicates with the internal space of the airbag 4. A pipe cap 3 is threadedly installed on the air injection pipe 2 to close the opening of the air injection pipe 2, so that the inert gas in the airbag 4 maintains a certain pressure. An annular gasket 5 is filled inside the airbag 4. During actual installation, the annular gasket 5 is in direct contact with the submersible electric pump, so as to prevent the airbag 4 from being worn by the submersible electric pump. A metal protection plate 6 is horizontally placed on the top wall of the airbag 4. The provided metal protection plate 6 is used to separate the airbag 4 from other structures above it, and can also prevent the liquid or other substances above the sealing sleeve 1 from contacting the airbag 4 to a certain extent. The airbag 4 and the annular gasket 5 form the sealing part of the submersible electric pump sealing structure with high stability;

[0022] Convex seats 7 extend to the outside at both ends of the sealing sleeve 1. Receiving grooves 8 are opened in the inner space of the sealing sleeve 1 and extend into the two convex seats 7. The two receiving grooves 8 are symmetric on both sides of the sealing sleeve 1. Springs 9 and fixed elastic pieces 10 are provided in the two receiving grooves 8. The springs 9 are horizontally designed, and the two ends of the springs 9 are respectively fixedly connected to the convex seats 7 and the fixed elastic pieces 10, so that the fixed elastic pieces 10 have a certain elasticity under the action of the springs 9. The fixed elastic pieces 10 are attached to the inner wall of the receiving grooves 8, and the two fixed elastic pieces 10 are both in contact with the metal protection plate 6, so that the two fixed elastic pieces 10 can limit the position of the metal protection plate 6, thereby limiting the position of the airbag 4 and ensuring the stability of the airbag 4 during long-term use.

[0023] Working principle: When in use, the submersible electric pump passes through the inside of the sealing sleeve 1 from above and exits from below the sealing sleeve 1. At this time, the outer wall of the submersible electric pump is in contact with the inner wall of the bottom of the inner space of the sealing sleeve 1. At the same time, an external air pump is used to supplement inert gas into the airbag 4 through the air injection pipe 2, so that the airbag 4 presents a state of expanding outwards. Then, the pipe cap 3 is installed on the air injection pipe 2 to ensure the expansion characteristics of the airbag 4. At this time, the airbag 4 will squeeze the annular gasket 5, so that the annular gasket 5 can closely fit on the outer wall of the submersible electric pump, thereby ensuring the sealing performance between the sealing sleeve 1 and the submersible electric pump; then, the two fixed elastic pieces 10 are squeezed so that they contract into the two receiving grooves 8, and the metal protection plate 6 is placed above the airbag 4. Then, the two fixed elastic pieces 10 are released. Under the action of the two springs 9, the two fixed elastic pieces 10 will exert a certain pressure on the metal protection plate 6, so that the metal protection plate 6 exerts a slight pressure on the airbag 4, thereby ensuring the stability of the airbag 4 under long-term use conditions.

[0024] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present utility model.

Claims

1. A sealing structure of a submersible electric pump with high stability, comprising a sealing sleeve (1), characterized in that: The center of the inner cavity of the sealing sleeve (1) is filled with a ring-shaped airbag (4), wherein the interior of the airbag (4) is hollow; An air injection pipe (2) is fixedly welded to the outer wall of the sealing sleeve (1), and the air injection pipe (2) is in communication with the internal space of the airbag (4). A pipe cap (3) is threadedly mounted on the air injection pipe (2), and a metal protective plate (6) is horizontally placed on the top wall of the airbag (4).

2. A sealing structure of a submersible electric pump with high stability according to claim 1, characterized in that: The inner side of the airbag (4) is filled with an annular gasket (5) of an annular design.

3. A sealing structure of a submersible electric pump with high stability according to claim 1, characterized in that: Both ends of the sealing sleeve (1) are provided with protruding seats (7) extending outward, and the inner space of the sealing sleeve (1) is provided with receiving grooves (8) in the two protruding seats (7).

4. A sealing structure of a submersible electric pump with high stability according to claim 3, characterized in that: A spring (9) and a fixing spring sheet (10) are provided in each of the two receiving grooves (8), wherein the spring (9) is designed to be horizontal, and two ends of the spring (9) are fixedly connected to the protruding seat (7) and the fixing spring sheet (10) respectively.

5. A sealing structure of a submersible electric pump with high stability according to claim 4, characterized in that: The fixing spring pieces (10) are fitted with the inner wall of the storage groove (8), and the two fixing spring pieces (10) are both in contact with the metal protection plate (6).

Images