Sealing structure of submersible motor for well

Abstract

The invention belongs to the technical field of water pumps, and particularly relates to a sealing structure of a submersible motor for a well, which comprises a motor shaft, an outer sealing device, an inner sealing device, an oil chamber cover and an oil chamber are sleeved on the motor shaft, the outer sealing device is positioned on the outer side of the oil chamber cover, and a mounting plate is arranged between the oil chamber cover and the oil chamber. The middle of the mounting plate protrudes towards the side away from the oil chamber cover, a second cavity is formed between the middle of the mounting plate and the oil chamber cover, the inner sealing device is located on the side, away from the second cavity, of the mounting plate, the second cavity is filled with lubricating grease, and the density of the lubricating grease is larger than that of water. The first annular partition plate sleeves the motor shaft and is driven by the motor shaft to rotate, the second annular partition plate is mounted on the mounting plate and located on the side, away from the oil chamber cover, of the first annular partition plate, a first annular baffle protrudes from the first annular partition plate to one side of the second annular partition plate, and a second annular baffle protrudes from the second annular partition plate to one side of the first annular partition plate. The inner sealing device is effectively protected, so that the service life of a product is prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of water pumps, and particularly refers to a sealing structure for a submersible motor for wells. Background Art

[0002] The existing sealing of submersible motors for wells mainly adopts the combination of an outer sealing device 1 and an inner sealing device 2. As Figure 1 shown, the outer sealing device 1 is sleeved on the motor shaft 3 and is located outside the oil chamber cover 4. The outer sealing device 1 is used to seal the gap between the motor shaft 3 and the oil chamber cover 4. The inner sealing device 2 is sleeved on the motor shaft 3 and is located in the cavity formed by the oil chamber cover 4 and the oil chamber 5. The inner sealing device 2 is used to seal the gap between the motor shaft 3 and the oil chamber cover 4. The outer sealing device 1 is mainly used for sand resistance while basically achieving water sealing, and generally uses a hard material. The inner sealing device 2 is mainly used for water sealing and generally uses a soft material, with poor sand resistance. Due to the harsh use conditions and large sediment content in some areas, when the outer sealing device 1 fails, the sediment entering the inner sealing device 2 through the outer sealing device 1 will damage the inner sealing device 2, thereby resulting in a short service life of the product. Summary of the Invention

[0003] The purpose of the present invention is to provide a sealing structure for a submersible motor for wells, which effectively protects the inner sealing device, thereby extending the service life of the product.

[0004] The present invention is implemented as follows: A sealing structure for a submersible motor for wells, including a motor shaft. An outer sealing device, an inner sealing device, an oil chamber cover and an oil chamber are sleeved on the motor shaft. The outer sealing device is located outside the oil chamber cover, and the outer sealing device seals the gap between the motor shaft and the oil chamber cover. The inner sealing device is located in a cavity one formed by the oil chamber cover and the oil chamber. An installation plate sleeved on the motor shaft is provided between the oil chamber cover and the oil chamber. The middle part of the installation plate protrudes towards the side away from the oil chamber cover and forms a cavity two with the oil chamber cover. The inner sealing device is located on the side of the installation plate away from the cavity two, and the inner sealing device seals the gap between the installation plate and the motor shaft. The cavity two is filled with grease, and the density of the grease is greater than the density of water. An annular partition one and an annular partition two are provided in the cavity two. The annular partition one is sleeved on the motor shaft and is driven to rotate by the motor shaft. The annular partition two is installed on the installation plate and is located on the side of the annular partition one away from the oil chamber cover. The annular partition one protrudes towards the annular partition two with an annular baffle one, and the annular partition two protrudes towards the annular partition one with an annular baffle two.

[0005] In the above-mentioned sealing structure for a submersible motor for wells, the sum of the heights of the annular baffle one and the annular baffle two is greater than the distance between the annular partition one and the annular partition two.

[0006] In the above-mentioned sealing structure of a submersible motor for well use, one annular baffle plate one and one annular baffle plate two are provided, and the annular baffle plate one is located outside the annular baffle plate two.

[0007] In the above-mentioned sealing structure of a submersible motor for well use, more than two annular baffle plate ones and more than two annular baffle plate twos are respectively provided, and the annular baffle plate one and the annular baffle plate two are arranged alternately, and the outermost annular baffle plate one is located outside the outermost annular baffle plate two.

[0008] In the above-mentioned sealing structure of a submersible motor for well use, the annular partition plate one protrudes with an annular fitting plate one towards the side of the annular partition plate two, and the annular fitting plate one is installed on the motor shaft. The annular partition plate two protrudes with an annular fitting plate two towards the side of the annular partition plate one. The annular fitting plate two is installed on the mounting plate. The outermost annular baffle plate one is inserted between the annular fitting plate two and the adjacent annular baffle plate two, and the remaining annular baffle plate ones are respectively inserted between two adjacent annular baffle plate twos. The innermost annular baffle plate two is inserted between the annular fitting plate one and the adjacent annular baffle plate one, and the remaining annular baffle plate twos are respectively inserted between two adjacent annular baffle plate ones.

[0009] In the above-mentioned sealing structure of a submersible motor for well use, a rubber sleeve tightly fitted with the motor shaft is fixed inside the inner circle of the annular fitting plate one; an O-ring for sealing the gap between the annular fitting plate two and the mounting plate is sleeved outside the annular fitting plate two.

[0010] In the above-mentioned sealing structure of a submersible motor for well use, the rubber sleeve is integrally formed by vulcanization inside the inner circle of the annular fitting plate one; an annular groove for installing the O-ring is recessed on the outer side wall of the annular fitting plate two.

[0011] In the above-mentioned sealing structure of a submersible motor for well use, the outermost annular baffle plate one is arranged on the outer circle of the annular partition plate one, and the innermost annular baffle plate two is arranged on the inner circle of the annular partition plate two.

[0012] In the above-mentioned sealing structure of a submersible motor for well use, the mounting plate protrudes with an annular mounting seat towards the side away from the oil chamber cover, and an installation groove for installing the inner sealing device is formed inside the annular mounting seat.

[0013] In the above-mentioned sealing structure of a submersible motor for well use, the outer sealing device and the inner sealing device are mechanical seals.

[0014] The prominent advantages of the present invention compared with the prior art are: The present invention provides a mounting plate between the oil chamber cover and the oil chamber. The middle part of the mounting plate protrudes away from the oil chamber cover, forming a second cavity between the mounting plate and the oil chamber cover. Grease is filled in the second cavity. The inner sealing device is located on the side of the mounting plate away from the second cavity. When the outer sealing device fails and sediment-laden water enters the second cavity, since the density of water is less than that of the grease, the water will not further enter the second cavity. The density of sediment is greater than that of the grease, but it is ground into powder by the outer sealing device. At the same time, the grease has a high viscosity, so the sediment will not directly flow downward. Since the grease has a high viscosity and will not flow freely without external force, the time for sediment to further enter is significantly delayed. At the same time, the present invention provides a first annular partition and a second annular partition in the second cavity. The first annular partition protrudes a first annular baffle towards the second annular partition, and the second annular partition protrudes a second annular baffle towards the first annular partition, forming a labyrinth structure to further prevent sediment from entering the inner sealing device, effectively protecting the inner sealing device and thus extending the service life of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a cross-sectional view of the prior art; Figure 2 is a cross-sectional view of the present invention without grease; Figure 3 is a cross-sectional view of the present invention.

[0016] REFERENCE NUMERALS: Figure 1 In the figure: 1, outer sealing device; 2, inner sealing device; 3, motor shaft; 4, oil chamber cover; 5, oil chamber.

[0017] Figure 2 、 3 In the figure: 11, motor shaft; 12, outer sealing device; 13, inner sealing device; 14, oil chamber cover; 15, oil chamber; 16, first cavity; 17, mounting plate; 18, second cavity; 19, grease; 20, first annular partition; 21, second annular partition; 22, first annular baffle; 23, second annular baffle; 24, first annular assembly plate; 25, second annular assembly plate; 26, rubber sleeve; 27, O-ring seal; 28, annular groove; 29, annular mounting seat. DETAILED DESCRIPTION OF THE INVENTION

[0018] The following further describes the present invention with specific embodiments, referring to Figure 2 、 3 : Embodiment 1: Referring to Figure 2 、 3 : A sealing structure for a submersible motor for wells, comprising a motor shaft 11, an outer sealing device 12, an inner sealing device 13, an oil chamber cover 14 and an oil chamber 15 are sleeved on the motor shaft 11. The outer sealing device 12 is located outside the oil chamber cover 14, and the outer sealing device 12 seals the gap between the motor shaft 11 and the oil chamber cover 14. The inner sealing device 13 is located in a cavity 16 formed between the oil chamber cover 14 and the oil chamber 15. An installation plate 17 sleeved on the motor shaft 11 is provided between the oil chamber cover 14 and the oil chamber 15. The middle part of the installation plate 17 protrudes towards the side away from the oil chamber cover 14 and forms a cavity 18 with the oil chamber cover 14. The inner sealing device 13 is located on the side of the installation plate 17 away from the cavity 18, and the inner sealing device 13 seals the gap between the installation plate 17 and the motor shaft 11. The cavity 18 is filled with a grease 19, and the density of the grease 19 is greater than the density of water. An annular partition 20 and an annular partition 21 are provided in the cavity 18. The annular partition 20 is sleeved on the motor shaft 11 and is driven to rotate by the motor shaft 11. The annular partition 21 is installed on the installation plate 17, and the annular partition 21 is located on the side of the annular partition 20 away from the oil chamber cover 14. An annular baffle 22 protrudes from the annular partition 20 towards the annular partition 21, and an annular baffle 23 protrudes from the annular partition 21 towards the annular partition 20.

[0019] As Figure 2 , 3 shown, in the present invention, an installation plate 17 is provided between the oil chamber cover 14 and the oil chamber 15. The middle part of the installation plate 17 protrudes towards the side away from the oil chamber cover 14 and forms a cavity 18 with the oil chamber cover 14, and the cavity 18 is filled with a grease 19. The inner sealing device 13 is located on the side of the installation plate 17 away from the cavity 18. When the outer sealing device 12 fails and sediment-laden water enters the cavity 18, since the density of water is less than the density of the grease 19, the water will not further enter the cavity 18. The density of sediment is greater than the density of the grease 19, but it is ground into powder by the outer sealing device 12. At the same time, the grease 19 has a large viscosity, and the sediment will not flow directly downward. Since the grease 19 has a large viscosity, it will not flow freely without external force, thus greatly delaying the time for sediment to further enter. At the same time, in the present invention, an annular partition 20 and an annular partition 21 are provided in the cavity 18. An annular baffle 22 protrudes from the annular partition 20 towards the annular partition 21, and an annular baffle 23 protrudes from the annular partition 21 towards the annular partition 20, forming a labyrinth structure to further prevent sediment from entering the inner sealing device 13, effectively protecting the inner sealing device, and thus extending the service life of the product.

[0020] In order to better block sediment from entering the inner sealing device 13, the sum of the heights of the annular baffle 22 and the annular baffle 23 is greater than the distance between the annular partition 20 and the annular partition 21.

[0021] To further prevent sediment from entering the inner sealing device 13, two or more of the first annular baffles 22 and the second annular baffles 23 are respectively provided, and the first annular baffles 22 and the second annular baffles 23 are alternately arranged, and the outermost first annular baffle 22 is located outside the outermost second annular baffle 23.

[0022] The specific structures and installation structures of the first annular partition 20 and the second annular partition 21 are as follows: Figure 2 、 3 As shown, the first annular partition 20 protrudes towards the second annular partition 21 to form a first annular fitting plate 24, and the first annular fitting plate 24 is installed on the motor shaft 11. The second annular partition 21 protrudes towards the first annular partition 20 to form a second annular fitting plate 25, and the second annular fitting plate 25 is installed on the mounting plate 17. The outermost first annular baffle 22 is inserted between the second annular fitting plate 25 and the adjacent second annular baffle 23, and the remaining first annular baffles 22 are respectively inserted between two adjacent second annular baffles 23. The innermost second annular baffle 23 is inserted between the first annular fitting plate 24 and the adjacent first annular baffle 22, and the remaining second annular baffles 23 are respectively inserted between two adjacent first annular baffles 22. The first annular baffles 22 and the second annular baffles 23 cross to form a multi-stage tortuous channel, further preventing sediment from entering the inner sealing device 13.

[0023] To prevent sediment from directly flowing towards the inner sealing device 13 through the gap between the first annular fitting plate 24 and the motor shaft 11, a rubber sleeve 26 tightly fitted with the motor shaft 11 is fixed to the inner circle of the first annular fitting plate 24.

[0024] To prevent sediment from entering below the second annular fitting plate 25 through the gap between the second annular fitting plate 25 and the mounting plate 17 and to fix the second annular fitting plate 25 in the mounting plate 17, an O-ring 27 for sealing the gap between the second annular fitting plate 25 and the mounting plate 17 is sleeved outside the second annular fitting plate 25.

[0025] For firm and reliable connection and convenient processing, the rubber sleeve 26 is integrally formed by vulcanization on the inner circle of the first annular fitting plate 24.

[0026] The installation structure of the O-ring 27: An annular groove 28 for installing the O-ring 27 is recessed in the outer side wall of the second annular fitting plate 25.

[0027] Furthermore, the outermost first annular baffle 22 is arranged on the outer circle of the first annular partition 20, and the innermost second annular baffle 23 is arranged on the inner circle of the second annular partition 21.

[0028] The installation structure of the inner sealing device 13: The mounting plate 17 protrudes towards the side away from the oil chamber cover 14 to form an annular mounting seat 29, and an installation groove for installing the inner sealing device 13 is formed in the annular mounting seat 29.

[0029] Further, the outer sealing device 12 and the inner sealing device 13 are mechanical seals.

[0030] The present invention can greatly improve the sand resistance of the product, extend the service life of the submersible motor by more than 10 times, and is inexpensive, with the cost increasing by 10 yuan - 15 yuan. At the same time, the materials are easy to purchase, the process is easy to implement, and no special process or highly skilled employees are required during the installation process. Embodiment 2:

[0031] The structure of this embodiment is basically the same as that of the above Embodiment 1, and the main difference lies in that: there is one annular baffle 1 22 and one annular baffle 2 23, and the annular baffle 1 22 is located outside the annular baffle 2 23.

[0032] The above embodiments are only one of the preferred embodiments of the present invention, and do not limit the scope of implementation of the present invention. Therefore, all equivalent changes made according to the shape, structure, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A sealing structure for a submersible motor for a well, comprising a motor shaft (11), wherein the motor shaft (11) is provided with an external sealing device (12), an internal sealing device (13), an oil chamber cover (14) and an oil chamber (15), wherein the external sealing device (12) is located outside the oil chamber cover (14), and the external sealing device (12) seals a gap between the motor shaft (11) and the oil chamber cover (14), and the internal sealing device (13) is located in a cavity (16) formed by the oil chamber cover (14) and the oil chamber (15), characterized in that: A mounting plate (17) sleeved on the motor shaft (11) is provided between the oil chamber cover (14) and the oil chamber (15); a middle portion of the mounting plate (17) protrudes toward a side away from the oil chamber cover (14) and forms a second cavity (18) with the oil chamber cover (14); the inner sealing device (13) is located on a side of the mounting plate (17) away from the second cavity (18), and the inner sealing device (13) seals a gap between the mounting plate (17) and the motor shaft (11); the second cavity (18) is filled with lubricating grease (19), and the density of the lubricating grease (19) is greater than the density of water. An annular partition plate 1 (20) and an annular partition plate 2 (21) are provided in the cavity 2 (18). The annular partition plate 1 (20) is sleeved on the motor shaft (11) and driven to rotate by the motor shaft (11). The annular partition plate 2 (21) is mounted on the mounting plate (17), and the annular partition plate 2 (21) is located on a side of the annular partition plate 1 (20) away from the oil chamber cover (14). The annular partition plate 1 (20) has an annular baffle plate 1 (22) protruding toward one side of the annular partition plate 2 (21), and the annular baffle plate 2 (23) protruding toward one side of the annular partition plate 1 (20).

2. The sealing structure of a submersible motor for a well according to claim 1, characterized in that: The sum of the heights of the annular baffle plate 1 (22) and the annular baffle plate 2 (23) is greater than the distance between the annular partition plate 1 (20) and the annular partition plate 2 (21).

3. The sealing structure of a submersible motor for a well according to claim 1, characterized in that: The annular baffle plate 1 (22) and the annular baffle plate 2 (23) are each provided with one, and the annular baffle plate 1 (22) is located outside the annular baffle plate 2 (23).

4. The sealing structure of a submersible motor for a well according to claim 1, characterized in that: There are more than two annular baffle plates 1 (22) and 2 (23) respectively, and the annular baffle plates 1 (22) and 2 (23) are arranged alternately, and the outermost annular baffle plate 1 (22) is located outside the outermost annular baffle plate 2 (23).

5. The sealing structure of a submersible motor for a well according to claim 4, characterized in that: The annular baffle plate 1 (20) is provided with an annular assembly plate 1 (24) protruding toward one side of the annular baffle plate 2 (21), and the annular assembly plate 1 (24) is mounted on the motor shaft (11); the annular baffle plate 2 (21) is provided with an annular assembly plate 2 (25) protruding toward one side of the annular baffle plate 1 (20); the annular assembly plate 2 (25) is mounted on the mounting plate (17); the outermost annular baffle plate 1 (22) is inserted between the annular assembly plate 2 (25) and an adjacent annular baffle plate 2 (23); the remaining annular baffle plates 1 (22) are respectively inserted between two adjacent annular baffle plates 2 (23); the innermost annular baffle plate 2 (23) is inserted between the annular assembly plate 1 (24) and an adjacent annular baffle plate 1 (22); the remaining annular baffle plates 2 (23) are respectively inserted between two adjacent annular baffle plates 1 (22).

6. The sealing structure of a submersible motor for a well according to claim 5, characterized in that: The inner ring of the annular assembly plate 1 (24) is fixed with a rubber sleeve (26) that is tightly matched with the motor shaft (11); the outer ring of the annular assembly plate 2 (25) is provided with an O-ring (27) that seals the gap between the annular assembly plate 2 (25) and the mounting plate (17).

7. The sealing structure of a submersible motor for a well according to claim 6, characterized in that: The rubber sleeve (26) is integrally formed on the inner ring of the first annular assembly plate (24) by vulcanization; the outer side wall of the second annular assembly plate (25) is concave to form an annular groove (28) for mounting an O-ring (27).

8. The sealing structure of a submersible motor for a well according to claim 4, characterized in that: The outermost annular baffle plate 1 (22) is arranged on the outer ring of the annular partition plate 1 (20), and the innermost annular baffle plate 2 (23) is arranged on the inner ring of the annular partition plate 2 (21).

9. The sealing structure of a submersible motor for a well according to claim 1, characterized in that: An annular mounting seat (29) protrudes from the mounting plate (17) on a side away from the oil chamber cover (14), and a mounting groove for mounting the inner sealing device (13) is formed in the annular mounting seat (29).

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