Capsule protector structure capable of being filled with oil conveniently and rapidly

Abstract

The utility model relates to a capsule protector structure capable of being filled with oil conveniently and quickly, which comprises an upper joint, a shell and a lower joint which are fixedly connected in sequence from top to bottom, an upper seat body, an elastic capsule tube and a lower seat body are arranged in the shell from top to bottom in sequence, and two ends of the elastic capsule tube are respectively connected with the peripheral walls of the upper seat body and the lower seat body in a sealing manner. An inner hole of the upper seat body and an inner hole of the lower seat body are fixedly connected with the two ends of the capsule connecting pipe, the capsule connecting pipe is located in the elastic capsule, the main shaft sequentially penetrates through the upper connector, the upper seat body, the capsule connecting pipe, the lower seat body and the lower connector from top to bottom, an oil inlet gap is formed between the main shaft and the capsule connecting pipe, and capsule exhaust holes are formed in the pipe wall of the upper end of the capsule connecting pipe. A capsule oil inlet hole is formed in the pipe wall of the lower end of the capsule connecting pipe and is a long hole extending in the axial direction of the capsule connecting pipe. The utility model has the advantages that the capsule oil inlet and the capsule exhaust end are respectively arranged at the two ends of the capsule connecting pipe and are long holes, the structure is simply changed, the problem that the capsule cannot be fully filled is effectively solved, and the device is suitable for popularization and use.

Description

Technical Field

[0001] The utility model belongs to the field of submersible motor protectors and relates to a capsule protector structure which can be filled with oil conveniently and quickly. Background Art

[0002] Submersible motors achieve deep diving by filling the motor oil to ensure the balance of internal and external pressures, and rely on the flowing well fluid to cool down. When working underground, the motor oil will expand due to heat. After the motor is turned off, the motor oil will cool down and shrink rapidly, causing water to enter the motor and damage the insulation. In order to protect the insulation of the motor, a capsule protector is usually used. It has a capsule made of flexible material. Through its contraction and expansion, it ensures that the internal and external pressure differences of the motor are equal under sealed conditions, ensuring the stable operation of the motor.

[0003] However, the capsule of the traditional capsule protector cannot be filled with motor oil, which causes the capsule protector to fail soon after it is lowered into the well, and then causes damage to the motor. In the design of the traditional capsule, the oil inlet and exhaust holes of the capsule are round holes, and are located at the same end of the capsule. During the surface oil injection process, the internal and external pressure difference is difficult to control when the liquid level reaches the oil inlet hole. Since the external oil injection speed is greater than the oil injection speed of the capsule oil inlet hole, the liquid level can easily cover the capsule oil injection hole and cover the exhaust hole. The gas inside the capsule is difficult to be discharged in time as required, resulting in the capsule breathing volume cannot reach the safe value. This also causes the submersible motor to start and stop frequently when working underground, and frequent starting and stopping can easily cause motor damage. Utility Model Content

[0004] The utility model provides a capsule protector structure which can be filled with oil conveniently and quickly, aiming to overcome the disadvantage of the current traditional capsule protector that the capsule cannot be filled with motor oil, resulting in the capsule protector becoming ineffective soon after being lowered into the well.

[0005] The utility model solves the above-mentioned technical problems with a technical solution as follows: a capsule protector structure that is convenient and quick to fill with oil, comprising an upper joint, a shell and a lower joint that are fixedly connected in sequence from top to bottom, an upper seat body, an elastic capsule tube and a lower seat body are arranged in sequence from top to bottom in the shell, the two ends of the elastic capsule tube are respectively sealed and connected to the outer peripheral walls of the upper seat body and the lower seat body, the inner holes of the upper seat body and the lower seat body are fixedly connected to the two ends of a capsule connecting tube, the capsule connecting tube is located in the elastic capsule, the main shaft passes through the upper joint, the upper seat body, the capsule connecting tube, the lower seat body and the lower joint in sequence from top to bottom, there is an oil inlet gap between the main shaft and the capsule connecting tube, a capsule exhaust hole is arranged on the upper end tube wall of the capsule connecting tube, and a capsule oil inlet hole is arranged on the lower end tube wall, the capsule oil inlet hole is a long hole extending along the axial direction of the capsule connecting tube.

[0006] On the basis of the above technical solution, the present invention can also be improved as follows.

[0007] Furthermore, the capsule exhaust hole is also a long hole extending along the axial direction of the capsule connecting tube.

[0008] Furthermore, the lower edge of the capsule oil inlet hole is close to the upper port of the lower seat body, and the upper edge of the capsule exhaust hole is close to the lower port of the upper seat body.

[0009] Furthermore, the capsule oil inlet hole and the capsule exhaust hole are both waist-shaped holes, and the long axis of the waist-shaped hole is parallel to the axial direction of the capsule connecting tube.

[0010] Furthermore, the capsule oil inlet holes are provided with two and are radially symmetrically arranged on the lower end tube wall of the capsule connecting tube, and the capsule exhaust holes are provided with two and are radially symmetrically arranged on the upper end tube wall of the capsule connecting tube.

[0011] Furthermore, the width of the long hole is 1 / 6 to 1 / 5 of the outer diameter of the capsule connecting tube, and the length of the long hole is 0.8 to 1.5 times the outer diameter of the capsule connecting tube.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The capsule oil inlet hole arranged on the tube wall at the lower end of the capsule connecting tube is a long hole extending along the axial direction. Therefore, when injecting oil into the well, the oil inlet speed of the elastic capsule tube can reach a balance with the external oil injection speed. The liquid level between the main shaft and the capsule connecting tube is basically the same as the liquid level in the elastic capsule tube and increases synchronously. When the liquid level covers the capsule exhaust hole at the upper end of the capsule connecting tube, the elastic capsule tube is also filled with motor oil at the same time, ensuring that the elastic capsule tube can be filled with motor oil, thereby greatly improving the reliability of the protector and ensuring that the motor does not get water for a long time underground. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A cross-sectional view along the axial direction of a capsule protector structure that is conveniently and quickly filled with oil provided by the utility model;

[0015] Figure 2 for Figure 1 A cross-sectional view of the capsule protector structure shown, which is convenient for quick filling of oil, when it is not installed in the main shaft;

[0016] Figure 3 For the picture Figure 1 The schematic diagram of a capsule protector structure that is conveniently and quickly filled with oil shows that the oil gradually flows upward and the air is gradually discharged upward during oil filling (the arrows indicate both the flow direction of the oil and the flow direction of the air being gradually discharged upward).

[0017] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0018] 1. Upper joint; 2. Shell; 3. Lower joint; 4. Upper seat; 5. Elastic capsule tube; 6. Lower seat; 7. Capsule connecting tube; 8. Main shaft; 9. Capsule exhaust hole; 10. Capsule oil inlet hole. DETAILED DESCRIPTION

[0019] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0020] In the description of the present invention, if terms indicating orientation such as "up", "down", "left", "right", "top", "bottom", "inside" and "outside" are used, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0021] like Figures 1 to 3 As shown, the utility model provides a capsule protector structure that is convenient and quick to fill with oil, comprising an upper joint 1, a shell 2 and a lower joint 3 that are fixedly connected in sequence from top to bottom, an upper seat body 4, an elastic capsule tube 5 and a lower seat body 6 are arranged in sequence from top to bottom in the shell 2, the two ends of the elastic capsule tube 5 are respectively sealed and connected to the outer peripheral walls of the upper seat body 4 and the lower seat body 6, the inner holes of the upper seat body 4 and the lower seat body 6 are fixedly connected to the two ends of a capsule connecting tube 7, the capsule connecting tube 7 is located in the elastic capsule, and a main shaft 8 passes through the upper joint 1, the upper seat body 4, the capsule connecting tube 7, the lower seat body 6 and the lower joint 3 in sequence from top to bottom, an oil inlet gap is provided between the main shaft 8 and the capsule connecting tube 7, a capsule exhaust hole is provided on the upper end tube wall of the capsule connecting tube 7, and a capsule oil inlet hole 10 is provided on the lower end tube wall, and the capsule oil inlet hole 10 is a long hole extending along the axial direction of the capsule connecting tube 7.

[0022] It should be noted that the existing capsule protector is usually provided with an oil inlet and an exhaust hole (generally the upper end) at the same end of the capsule connecting tube. When the external oil injection speed fluctuates in actual use, this structural design causes the oil injection speed of the capsule oil inlet hole to be less than the external oil injection speed, resulting in the liquid level between the spindle and the capsule connecting tube being higher than the liquid level in the capsule, thereby quickly blocking the capsule exhaust hole. The capsule oil inlet and the capsule exhaust hole should be as far away as possible to effectively prevent similar situations, resulting in the problem that the capsule cannot be filled (this defect will also occur when the oil inlet and the exhaust hole are set at both ends and the oil inlet adopts a round hole structure), thereby further ensuring that the inside of the capsule is filled with motor oil, greatly improving the reliability of the protector and the service life of the motor. When the oil inlet hole adopts a round hole instead of a long hole, since the diameter of the capsule connecting tube is limited and it needs to play a connecting and fixing role (a certain strength needs to be ensured), the round hole cannot be opened larger, which results in the oil injection speed into the elastic capsule tube being limited, the oil injection inside the capsule is slow, and the oil injection in the gap between the capsule and the spindle is fast, resulting in a significant height difference between the inner and outer liquid levels, which in turn leads to the technical problem that the capsule cannot be filled. The utility model sets the capsule oil inlet hole as a long hole extending along the axial direction, so that the size of the oil inlet hole is basically not limited by the diameter of the capsule connecting pipe, and has a larger oil inlet diameter, thereby ensuring a better balance of the liquid levels inside and outside the oil inlet.

[0023] In one embodiment of the present invention, Figure 2 As shown, the capsule exhaust hole is also a long hole extending along the axial direction of the capsule connecting tube 7.

[0024] As mentioned above, the capsule exhaust holes are long holes instead of round holes, which can also ensure a larger exhaust diameter, not be limited by the diameter of the capsule connecting pipe, and ensure that the increase in the exhaust diameter will not excessively reduce the strength of the capsule connection.

[0025] In one embodiment of the present invention, the lower edge of the capsule oil inlet hole 10 is close to the upper port of the lower seat body 6 , and the upper edge of the capsule exhaust hole is close to the lower port of the upper seat body 4 .

[0026] It is understandable that the above structural restrictions can ensure that the elastic capsule tube can be better filled with oil, ensuring that the protector has better performance.

[0027] In one embodiment of the present invention, the capsule oil inlet hole 10 and the capsule exhaust hole are both waist-shaped holes, and the long axis of the waist-shaped hole is parallel to the axial direction of the capsule connecting tube 7 .

[0028] It should be noted that the long hole is a waist-shaped hole with the long axis along the axial direction of the capsule connecting tube, which has the advantage of convenient processing. It is understandable that when necessary, the long hole can also be set as a rectangular long hole or a long hole of other shapes, or even a long hole in a curved shape as a whole, which may increase the processing cost but does not affect the solution of the corresponding technical problem.

[0029] In one embodiment of the utility model, the capsule oil inlet holes 10 are provided with two and are radially symmetrically arranged on the lower end tube wall of the capsule connecting tube 7, and the capsule exhaust holes are provided with two and are radially symmetrically arranged on the upper end tube wall of the capsule connecting tube 7.

[0030] It can be understood that when the number of capsule oil inlets is two or more, the width of each capsule oil inlet hole can be narrower and oil inlet from multiple directions can ensure smoother and more uniform oil inlet.

[0031] In one embodiment of the present invention, the width of the long hole is 1 / 6 to 1 / 5 of the outer diameter of the capsule connecting tube 7 , and the length of the long hole is 0.8-1.5 times the outer diameter of the capsule connecting tube 7 .

[0032] It should be noted that the above-mentioned size limitation can better balance the contradiction between the oil inlet diameter or the exhaust diameter and the strength requirement of the capsule connecting pipe.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A capsule protector structure for convenient and quick filling of oil, comprising an upper joint (1), a shell (2) and a lower joint (3) which are fixedly connected in sequence from top to bottom, wherein an upper seat body (4), an elastic capsule tube (5) and a lower seat body (6) are arranged in sequence from top to bottom in the shell (2), the two ends of the elastic capsule tube (5) are respectively sealedly connected to the outer peripheral walls of the upper seat body (4) and the lower seat body (6), the inner holes of the upper seat body (4) and the lower seat body (6) are fixedly connected to the two ends of a capsule connecting tube (7), the capsule connecting tube (7) is located in the elastic capsule, the main shaft (8) passes through the upper joint (1), the upper seat body (4), the capsule connecting tube (7), the lower seat body (6) and the lower joint (3) in sequence from top to bottom, and there is an oil inlet gap between the main shaft (8) and the capsule connecting tube (7), characterized in that: The upper end tube wall of the capsule connecting tube (7) is provided with a capsule exhaust hole, and the lower end tube wall is provided with a capsule oil inlet hole (10), and the capsule oil inlet hole (10) is a long hole extending along the axial direction of the capsule connecting tube (7).

2. A capsule protector structure for convenient and quick filling of oil according to claim 1, characterized in that: The capsule exhaust hole is also a long hole extending along the axial direction of the capsule connecting tube (7).

3. A capsule protector structure for convenient and quick filling of oil according to claim 2, characterized in that: The lower edge of the capsule oil inlet hole (10) is close to the upper port of the lower seat body (6), and the upper edge of the capsule exhaust hole is close to the lower port of the upper seat body (4).

4. A capsule protector structure for convenient and quick filling of oil according to claim 2, characterized in that: The capsule oil inlet hole (10) and the capsule exhaust hole are both waist-shaped holes, and the long axis of the waist-shaped hole is parallel to the axial direction of the capsule connecting tube (7).

5. The capsule protector structure for convenient and quick filling of oil according to claim 2, characterized in that: The capsule oil inlet holes (10) are provided with two and are radially symmetrically arranged on the lower end tube wall of the capsule connecting tube (7), and the capsule exhaust holes are provided with two and are radially symmetrically arranged on the upper end tube wall of the capsule connecting tube (7).

6. A capsule protector structure for convenient and quick filling of oil according to any one of claims 2 to 5, characterized in that: The width of the long hole is 1 / 6 to 1 / 5 of the outer diameter of the capsule connecting tube (7), and the length of the long hole is 0.8 to 1.5 times the outer diameter of the capsule connecting tube (7).

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