Connecting device for electric submersible pump shaft

Abstract

The utility model relates to the technical field of electric submersible pumps, and discloses a connecting device for an electric submersible pump shaft, which comprises a coupler, a first shaft hole and a second shaft hole are arranged on two side surfaces of the coupler, the first shaft hole and the second shaft hole are concentrically arranged, and the first shaft hole and the second shaft hole are not communicated with each other. A rotating shaft of the electric submersible pump is connected with the coupler through keys arranged in the first shaft hole and the second shaft hole, the outer diameter of the second shaft hole is larger than that of the first shaft hole, bosses on the two sides of the coupler are provided with a main sealing groove and an auxiliary sealing groove, and the bosses on the two sides of the coupler are provided with four flange holes which are evenly distributed. The utility model provides reliable sealing performance and structural stability, and is suitable for the connection requirement of the shaft of the electric submersible pump, so as to prevent external infiltration and improve the performance and reliability of the whole equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of submersible electric pumps, in particular to a connecting device for a shaft of a submersible electric pump. Background Art

[0002] In the oil industry, submersible pumps are widely used in the production process of underground oil fields. Submersible pumps are driven by electric motors to lift oil from oil wells to the surface, achieving efficient oil field exploitation. However, in the design of submersible pumps, the design and performance of the shaft connection device directly affect the reliability and operating efficiency of the entire equipment. Traditional submersible pump shaft connection devices have some problems, such as unstable sealing performance, complex structure, and easy damage.

[0003] The application number is CN201620218913.5, which discloses an improved submersible electric pump connection device, including a coupling body. By arranging a first axial hole and a second axial hole on the coupling body, the first axial hole and the second axial hole are respectively connected to the rotating shaft, thereby increasing the bearing torque of the submersible pump variable diameter coupling, eliminating the internal coupling structure after riveting, and solving the problem of reduced aperture.

[0004] However, there are some shortcomings: the connection device lacks a clear sealing mechanism, and the oil or lubricant may leak during operation, reducing the efficiency of the equipment, causing additional friction or loss, thereby affecting the life and performance of the equipment. Utility Model Content

[0005] In order to solve the above technical problems, the utility model is realized by the following technical solutions:

[0006] The utility model is a connecting device for a submersible electric pump shaft, comprising a coupling, wherein a first shaft hole and a second shaft hole are provided on both side surfaces of the coupling, the first shaft hole and the second shaft hole are concentrically arranged, and the first shaft hole and the second shaft hole are not connected, the rotating shaft of the submersible electric pump is connected to the coupling through keys arranged in the first shaft hole and the second shaft hole, the outer diameter of the second shaft hole is larger than the outer diameter of the first shaft hole, main sealing grooves and auxiliary sealing grooves are provided on bosses on both sides of the coupling, and 4 flange holes are evenly distributed on the bosses on both sides of the coupling.

[0007] Furthermore, the first axial hole and the second axial hole are circular in cross-section and have four groups of arc-shaped outwardly extending ribs on their edges.

[0008] Furthermore, the cross-section of the main sealing groove is semicircular, and a sealing rubber ring is provided in the semicircular notch of the main sealing groove.

[0009] Furthermore, the cross-section of the secondary sealing groove is a triangle, and a sealing rubber pad is provided inside the triangle.

[0010] Furthermore, the inner diameter of the secondary sealing groove is greater than the outer diameter of the primary sealing groove.

[0011] Furthermore, the outer diameters of the bosses on both sides of the coupling are provided with four groups of reinforcing ribs.

[0012] Furthermore, the reinforcing ribs are strip-shaped.

[0013] The utility model has the following beneficial effects:

[0014] The double sealing structure of the utility model: The main sealing groove and the auxiliary sealing groove on the bosses on both sides of the coupling provide effective sealing, which helps to prevent the leakage of lubricating oil or other liquids and ensure the normal operation of the equipment.

[0015] Reinforcement rib design of the utility model: Reinforcement ribs are provided on the outer diameters of the bosses on both sides of the coupling. This structure helps to enhance the overall strength and rigidity of the coupling and improve its ability to resist torsion and bending.

[0016] The utility model is connected by a key: the rotating shaft is connected to the coupling by a key. This connection method can provide reliable rotation transmission and can withstand certain axial and radial loads.

[0017] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a schematic diagram of the external three-dimensional structure of the utility model;

[0020] Figure 2 This is a side view of the structure of the utility model;

[0021] Figure 3 This is a schematic diagram of the central cross-sectional structure of the utility model;

[0022] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0023] In the figure: 1. Coupling; 2. First shaft hole; 3. Second shaft hole; 4. Main sealing groove; 5. Secondary sealing groove; 6. Flange hole; 7. Reinforcing rib. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1-Figure 3 As shown, the utility model is a submersible electric pump shaft connection device, including a coupling 1, wherein the surfaces of both sides of the coupling 1 are provided with a first shaft hole 2 and a second shaft hole 3, wherein the first shaft hole 2 and the second shaft hole 3 are concentrically arranged, and the first shaft hole 2 and the second shaft hole 3 are not connected, and the rotating shaft of the submersible electric pump is connected to the coupling 1 through keys arranged in the first shaft hole 2 and the second shaft hole 3, wherein the outer diameter of the second shaft hole 3 is larger than the outer diameter of the first shaft hole 2, and main sealing grooves 4 and auxiliary sealing grooves 5 are arranged on the bosses on both sides of the coupling 1, and 4 flange holes 6 are evenly distributed on the bosses on both sides of the coupling 1.

[0026] The first axial hole 2 and the second axial hole 3 are circular in cross section and have four groups of arc-shaped outwardly stretched ribs at their edges, making the connection more reliable and able to withstand greater torsional force, thereby improving the stability of the connection.

[0027] The cross section of the main sealing groove 4 is semicircular, and a sealing rubber ring is arranged in the semicircular notch of the sealing groove. A larger contact area can be provided, which is conducive to creating a stronger seal. This design can effectively reduce the possibility of liquid or lubricating oil leakage in the coupling 1, ensuring the normal operation of the hydraulic system or lubrication system.

[0028] The cross section of the secondary sealing groove 5 is triangular, and a sealing rubber pad is arranged in the triangle. The triangular cross section shape can provide a sharper edge, which helps to better seal the connection part. A tighter seal can be formed in the sealing groove, effectively preventing the leakage of liquid or lubricating oil.

[0029] The inner diameter of the secondary sealing groove 5 is greater than the outer diameter of the primary sealing groove 4. Double sealing is formed to provide higher sealing performance, and the two sealing grooves form an additional barrier to prevent liquid or lubricating oil from leaking in the connection part.

[0030] The outer diameter of the bosses on both sides of the coupling 1 is provided with four groups of reinforcing ribs 7. The overall structural strength of the coupling 1 can be increased, making it more able to withstand torsional forces and other external loads, and reducing the risk of deformation and damage.

[0031] The reinforcing ribs 7 are strip-shaped, which can help disperse the concentration of external stress and avoid excessive stress in specific areas, thereby reducing the risk of structural damage.

[0032] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A submersible electric pump shaft connection device, comprising a coupling (1), characterized in that: The coupling (1) has a first shaft hole (2) and a second shaft hole (3) formed on both side surfaces. The first shaft hole (2) and the second shaft hole (3) are concentrically arranged and are not connected to each other. The rotating shaft of the submersible electric pump is connected to the coupling (1) via keys provided in the first shaft hole (2) and the second shaft hole (3). The outer diameter of the second shaft hole (3) is larger than the outer diameter of the first shaft hole (2). The coupling (1) has a main sealing groove (4) and a secondary sealing groove (5) formed on both side bosses. The coupling (1) has four flange holes (6) evenly distributed on both side bosses.

2. A submersible electric pump shaft connection device according to claim 1, characterized in that: The first axial hole (2) and the second axial hole (3) have circular cross-sections and their edges have four groups of arc-shaped outwardly extending ribs.

3. A submersible electric pump shaft connection device according to claim 1, characterized in that: The cross section of the main sealing groove (4) is semicircular, and a sealing rubber ring is provided in the semicircular notch of the main sealing groove (4).

4. A submersible electric pump shaft connection device according to claim 1, characterized in that: The cross section of the secondary sealing groove (5) is a triangle, and a sealing rubber pad is provided inside the triangle.

5. A submersible electric pump shaft connection device according to claim 1, characterized in that: The inner diameter of the secondary sealing groove (5) is greater than the outer diameter of the primary sealing groove (4).

6. A submersible electric pump shaft connection device according to claim 1, characterized in that: Four groups of reinforcing ribs (7) are provided on the outer diameters of the bosses on both sides of the coupling (1).

7. A submersible electric pump shaft connection device according to claim 6, characterized in that: The reinforcing rib (7) is in the shape of a strip.

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