Protector structure for preventing capsule from being broken by suction

Abstract

The utility model relates to the technical field of capsule protection, and discloses a capsule anti-suction-breakage protector structure which comprises a sealing seat, a lower capsule seat arranged on the side wall of the sealing seat, a capsule protection shaft pipe arranged on the side wall of the lower capsule seat, a capsule body arranged on the side wall of the lower capsule seat, a protector shaft arranged on the side wall of the capsule protection shaft pipe, and an anti-suction-breakage device arranged on the side wall of the protector shaft. An upper capsule base is arranged on the side wall of the protector shaft, and a protection table is arranged on the side wall of the upper capsule base. The capsule cavity is defined by the upper capsule base, the capsule and the lower capsule base, the protector shaft is arranged in the capsule cavity and protected by the capsule shaft protection pipe, the sand prevention cap at the upper end of the shaft protection pipe blocks impurities, the upper capsule base is sequentially connected with the shaft protection pipe, the protector head and the one-way valve, and the capsule is driven through heat expansion and cold contraction of motor oil to achieve oil discharge and oil supplement. The protection table of the upper capsule seat separates the oil passing hole, so that the capsule is prevented from being broken by suction; the upper capsule seat is in threaded connection with the capsule shaft protection pipe, the problem of welding deformation is avoided, and the service life is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of capsule protection technology, and in particular to a capsule anti-burst protector structure. Background Technology

[0002] In the submersible electric pump (FET) industry, bladder-type protectors are widely used. Their core function is to balance the internal and external pressures of the FET unit through the expansion and contraction of the bladder, thereby ensuring stable motor operation. Under complex downhole conditions, the oil in the motor and protector will fluctuate in volume due to temperature changes. The bladder structure regulates the oil flow to maintain pressure stability, preventing damage to the equipment due to pressure imbalance. It is a key component for ensuring the reliable operation of the FET.

[0003] Existing capsule-type protectors typically consist of a capsule, a capsule shaft sleeve, an upper capsule seat, and a lower capsule seat. During operation, the motor oil expands due to heat, pushing the capsule and increasing the pressure inside the capsule cavity. When the pressure exceeds the set value of the one-way valve on the protector head, the excess oil is discharged through the one-way valve, thus releasing the pressure. When the motor cools down, the oil contracts, creating negative pressure. The oil inside the capsule flows back to the motor through the oil passage holes in the capsule shaft sleeve and the upper capsule seat, while external well fluid fills the area around the capsule, re-establishing pressure balance.

[0004] However, under special operating conditions such as frequent start-ups and shutdowns in high-temperature oil wells, a large amount of oil in the motor and protector is lost through the check valve and cannot be replenished. When the motor stops and the internal oil demand exceeds the remaining oil in the bladder, a strong negative pressure is formed inside the bladder, causing the bladder to be attracted to the bladder shaft tube and the upper bladder seat wall. As the negative pressure continues to increase, the bladder will come into direct contact with the oil passage and be sucked up and ruptured, leading to bladder failure and affecting the normal operation and service life of the submersible pump. Therefore, a bladder anti-rupture protector structure is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides a capsule anti-absorption and rupture protector structure, which aims to improve the problems in the prior art where capsules rupture and fail due to negative pressure adsorption on the oil passage and require straightening due to welding deformation.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A capsule anti-burst protector structure includes a sealing seat, a lower capsule seat is provided on the side wall of the sealing seat, a capsule shaft protector tube is provided on the side wall of the lower capsule seat, and a capsule body is provided on the side wall of the lower capsule seat.

[0008] As a further description of the above technical solution:

[0009] The capsule shaft is provided with a protector shaft on the side wall, and the protector shaft is provided with an upper capsule seat on the side wall.

[0010] As a further description of the above technical solution:

[0011] The upper capsule seat sidewall is provided with a protective platform, and the outer circle of the protective platform is set with smooth rounded corners.

[0012] As a further description of the above technical solution:

[0013] The upper capsule seat sidewall is provided with a straight hole, the upper end of the straight hole is provided with an annular cavity, and the protective platform sidewall is provided with an oil passage hole.

[0014] As a further description of the above technical solution:

[0015] The upper capsule seat and the capsule shaft protector tube are connected by matching internal and external threads, and the upper end of the capsule shaft protector tube is provided with a sand-proof cap.

[0016] As a further description of the above technical solution:

[0017] The upper end of the upper capsule seat is provided with a shaft guard tube body, the side wall of the shaft guard tube body is provided with a one-way valve, and the side wall of the one-way valve is provided with a protector head.

[0018] As a further description of the above technical solution:

[0019] The upper capsule seat, the capsule body, and the lower capsule seat form a capsule cavity, and the protector shaft is disposed inside the capsule cavity.

[0020] This utility model has the following beneficial effects:

[0021] In this invention, the capsule cavity of the protector is formed by an upper capsule seat, a capsule, and a lower capsule seat, with a protector shaft passing through it. The shaft is protected by a capsule shaft guard tube, and the upper end of the shaft guard tube is protected by a sand cap to prevent impurities. The upper capsule seat is connected in sequence to the shaft guard tube, the protector head, and a one-way valve. When the motor oil heats up, the capsule expands. When the oil pressure exceeds the threshold of the one-way valve, oil is discharged; otherwise, the valve closes. When the motor cools down, the capsule contracts, and oil is replenished through the oil passage hole of the shaft guard tube. When the negative pressure is high, the capsule is adsorbed onto the inner wall. The protective platform separates the oil passage hole to prevent it from being sucked up and breaking. This solves the problem of capsule rupture and failure due to negative pressure adsorption onto the oil passage hole and the need for straightening due to welding deformation. The above technical solution improves the service life and reliability of the capsule. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the internal structure of the capsule cavity of a capsule anti-absorption and rupture protector structure proposed in this utility model.

[0023] Legend:

[0024] 1. Sealing seat; 2. Lower capsule seat; 3. Capsule shaft protector tube; 4. Capsule body; 5. Protector shaft; 6. Upper capsule seat; 7. Sand cap; 8. Shaft protector tube body; 9. One-way valve; 10. Protector head; A. Oil passage hole; D. Straight hole; C. Protective platform; E. Annular cavity. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Reference Figure 1 This utility model provides an embodiment of a capsule anti-burst protector structure, including a sealing seat 1, a lower capsule seat 2 disposed on the side wall of the sealing seat 1, a capsule shaft protector tube 3 disposed on the side wall of the lower capsule seat 2, a capsule body 4 disposed on the side wall of the lower capsule seat 2, and a protector shaft 5 disposed on the side wall of the capsule shaft protector tube 3. The capsule shaft protector tube 3 is used to prevent the capsule body 4 from contacting the protector shaft 5 when it contracts. An upper capsule seat 6 is disposed on the side wall of the protector shaft 5, and a protective platform C is disposed on the side wall of the upper capsule seat 6. The outer circle of the protective platform C is set with smooth rounded corners. The protective platform C is used to separate the inner wall of the capsule from the oil passage A, which can prevent the capsule from being sucked up and bursting. The upper capsule seat 6 has a straight hole D on its side wall, and an annular cavity E is provided at the upper end of the straight hole D. The protective platform C has an oil passage hole A on its side wall. The upper capsule seat 6 and the capsule shaft protector tube 3 are connected by matching internal and external threads. The upper end of the capsule shaft protector tube 3 is provided with a sandproof cap 7, which prevents external impurities from entering the gap between the protector shaft 5 and the capsule shaft protector tube 3. The upper end of the upper capsule seat 6 is provided with a shaft protector tube body 8, and a one-way valve 9 is provided on the side wall of the shaft protector tube body 8. The side wall of the one-way valve 9 is provided with a protector head 10. The upper capsule seat 6, the capsule body 4 and the lower capsule seat 2 form a capsule cavity, and the protector shaft 5 is located inside the capsule cavity.

[0027] Working principle: The protector bladder cavity is formed by the upper bladder seat 6, the bladder 4, and the lower bladder seat 2. A protector shaft 5 passes through the cavity, and the protector shaft 5 is protected by a bladder shaft guard tube 3 to prevent the bladder 4 from contacting the protector shaft 5 during contraction. A sand-proof cap 7 at the upper end of the bladder shaft guard tube 3 prevents impurities from entering the gap between the protector shaft 5 and the bladder shaft guard tube 3. The upper end of the upper bladder seat 6 has a shaft guard tube 8, a protector head 10, and a one-way valve 9 arranged sequentially. During normal operation, the motor oil on the motor side expands due to heat and enters the bladder cavity, causing the bladder to... When the oil pressure exceeds the sum of the opening pressure of the one-way valve 9 and the ambient pressure, the one-way valve 9 opens, and excess oil is discharged to the outer cavity of the capsule. When the oil pressure is less than this pressure, the one-way valve 9 closes. When the motor temperature drops and oil needs to be replenished, the capsule contracts, and the oil in the capsule cavity flows to the next stage cavity through the oil passage A at the top of the capsule shaft protector tube 3 to replenish oil. When the negative pressure inside the capsule is high, the inner wall of the capsule adheres to the capsule shaft protector tube 3 and the upper capsule seat 6. The protective platform C of the upper capsule seat 6 separates the inner wall of the capsule from the oil passage A to prevent the capsule from being sucked up and ruptured.

[0028] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A capsule anti-absorption and rupture protector structure, comprising a sealing seat (1), characterized in that: The sealing seat (1) is provided with a lower capsule seat (2) on its side wall, the lower capsule seat (2) is provided with a capsule shaft protector tube (3) on its side wall, and the lower capsule seat (2) is provided with a capsule body (4) on its side wall; the capsule shaft protector tube (3) is provided with a protector shaft (5) on its side wall, and the protector shaft (5) is provided with an upper capsule seat (6) on its side wall; the upper capsule seat (6) is provided with a protective platform (C) on its side wall, and the outer circle of the protective platform (C) is provided with a smooth rounded corner; the upper capsule seat (6) is provided with a straight hole (D) on its side wall, and the upper end of the straight hole (D) is provided with an annular cavity (E); the protective platform (C) is provided with an oil passage hole (A) on its side wall.

2. The capsule anti-burst protector structure according to claim 1, characterized in that: The upper capsule seat (6) and the capsule shaft protector tube (3) are connected by matching internal and external threads, and the upper end of the capsule shaft protector tube (3) is provided with a sandproof cap (7).

3. The capsule anti-burst protector structure according to claim 2, characterized in that: The upper capsule seat (6) is provided with a shaft guard tube body (8), the side wall of the shaft guard tube body (8) is provided with a one-way valve (9), and the side wall of the one-way valve (9) is provided with a protector head (10).

4. The capsule anti-burst protector structure according to claim 1, characterized in that: The upper capsule seat (6), the capsule body (4), and the lower capsule seat (2) form a capsule cavity, and the protector shaft (5) is disposed inside the capsule cavity.

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