Sand prevention structure of submersible pump for well

Abstract

The utility model relates to a sand prevention structure of a submersible pump for a well. The sand prevention structure is characterized by comprising a sand throwing ring, a sealing rubber ring, a sponge mat, an upper guide, a rotating shaft and an oil seal, the structure is provided with three layers of protection, the first layer is a sand throwing ring, the second layer is a sealing washer, and the third layer is a sponge cushion. The sand-proof oil seal has a good sand-proof function, sand grains in water can be effectively prevented from invading the oil seal, and long-term reliable operation of a submersible pump product for a well is guaranteed. When the service life of the water pump reaches the maintenance period, only the sand throwing ring, the sealing gasket and the sponge mat need to be replaced, the cost is low, replacement is easy, the service life of the submersible pump for the well can be greatly prolonged through the sand prevention structure, the submersible pump for the well can operate for a longer time in a water area with the large sand content, and the use efficiency and economic benefits of equipment are improved.

Description

Technical Field

[0001] This technical solution mainly relates to the "technical field of well equipment", "technical field of submersible pump equipment" and "technical field of motor equipment", and particularly to a sand prevention structure for a submersible pump used in a well. Background Art

[0002] Well submersible pump is a kind of equipment widely used in the fields of domestic water, animal husbandry and farmland irrigation. Its main function is to pump groundwater to the surface. In some water quality environments with high sand content, the sealing structure of the water pump motor is easily worn by sand particles, which damages the motor bearings, causing the water pump to shut down or shorten its service life. Therefore, how to make the water pump run stably under conditions with high sand content and improve its service life is an urgent problem to be solved in the current field of well submersible pump equipment technology.

[0003] Existing well submersible motors mostly use a sealing mechanism consisting of a sand-slinging ring and an oil seal to prevent sand from entering the motor. The sand-slinging ring is set at the output end of the motor to prevent impurities in the water from invading the oil seal. This design can prevent sand from entering the motor to a certain extent and ensure the normal operation of the motor.

[0004] However, there are some problems with the existing sand-proof structure. First, ordinary sand-flinging rings can only filter out large sand particles by rotating, but are powerless against fine sand particles. These fine sand particles will constantly impact and invade the oil seal, causing the oil seal to fail quickly. Secondly, even if the sand particles are blocked outside by the sand-flinging ring, due to the gap between the sealing rubber ring and the rotating shaft, the sand particles may still pass through the gap to enter the motor, thereby damaging the motor. In addition, the existing sand-proof structure is troublesome to replace when the water pump reaches the maintenance period, and the cost is also high. Utility Model Content

[0005] The purpose of the utility model is to overcome the above-mentioned defects and to provide a sand prevention structure for a submersible well pump in order to improve the stable operation of the motor of a submersible well pump under working conditions with a large sand content.

[0006] The utility model discloses a sand prevention structure for a submersible pump used in a well, which is characterized by being composed of a sand throwing ring, a sealing rubber ring and a sponge pad.

[0007] This structure is equipped with three layers of protection. The first layer is a sand throwing ring. The sand throwing ring rotates to throw out large sand particles. There is a ring in the inner hole of the sand throwing ring that fits with the upper guide structure, which can effectively prevent sand particles from entering. The upper inner hole of the sand throwing ring is sleeved on the outside of the rotating shaft. The two are matched through a flat key. When the rotating shaft is working, the sand throwing ring is driven to rotate; the lower inner hole of the sand throwing ring is sleeved on the outside of the upper guide structure. The overlap length of the two is 6~10mm, the axial clearance is 1~3mm, and the radial clearance is 0.5~1mm; the inner hole boss of the sand throwing ring fits with the upper guide structure 4, and rubs against each other when rotating.

[0008] The second layer is a sealing gasket made of wear-resistant rubber. The outer ring has an interference fit with the upper guide structure, and the inner ring has a clearance of 0.5 mm with the rotating shaft. After the sand grains enter the second layer, they will be driven by the sand throwing ring and rotate around the outer ring of the sealing gasket, making it difficult to pass through the sealing gasket and reach the gap between the rotating shaft and the inner ring of the sealing gasket.

[0009] The third layer is a sponge pad, which has filtering properties itself. The sand grains entering this layer will be filtered and are not likely to pass through this layer of protection and enter the motor sealing layer, damaging the mechanical seal or oil seal and other sealing structures of the motor.

[0010] When the water pump reaches the maintenance period, only the sand throwing ring, sealing gasket and sponge pad need to be replaced. They are inexpensive, easy to replace, and the anti-sand function can be continued after replacement. The anti-sand structure of a submersible well pump of the present utility model has a good anti-sand function, can effectively prevent sand grains in the water from damaging the mechanical seal or oil seal, ensure the long-term reliable operation of the submersible well pump product, and can greatly improve the service life of the submersible well pump product.

[0011] Compared with the existing technology, the beneficial effects of the present technical solution are as follows:

[0012] 1. The anti-sand structure of the present utility model is composed of a sand throwing ring, a sealing rubber ring and a sponge pad, forming a three-layer protection, which can more effectively prevent sand grains from entering the motor and protect the mechanical seal or oil seal and other sealing structures of the motor, thereby increasing the service life of the motor. Compared with the existing technology, the anti-sand effect of the present utility model is better, and it can better cope with the water quality environment with a large amount of sand.

[0013] 2. The sand throwing ring of the present utility model can filter out sand grains with large mass by rotation, while the sealing rubber ring and the sponge pad can block fine sand grains, forming a comprehensive anti-sand protection. Compared with the existing technology, the anti-sand structure of the present utility model is more rigorous and can more effectively prevent the damage of sand grains to the motor.

[0014] 3. When the water pump reaches the maintenance period, the anti-sand structure of the present utility model is relatively easy to replace, inexpensive and simple to replace. Compared with the existing technology, the maintenance cost and workload are greatly reduced.

[0015] 4. The anti-sand structure of the present utility model can greatly improve the service life of the submersible well pump product, enable it to operate longer in waters with a large amount of sand, and improve the use efficiency and economic benefits of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the present utility model;

[0017] Figure 2 is a schematic diagram of the cooperation between the sand throwing ring and the upper guide structure;

[0018] In the figure: 1. Sand-throwing ring; 2. Sealing rubber ring; 3. Sponge pad; 4. Upper guide structure; 5. Rotating shaft; 6. Oil seal; 11. Inner hole boss of the sand-throwing ring. Specific implementation manner

[0019] The following combines the attached Figure 1 、attached Figure 2 to further explain the present utility model. Embodiment

[0020] A sand prevention structure for a submersible pump for wells, characterized in that it is composed of a sand-throwing ring 1, a sealing rubber ring 2, a sponge pad 3, an upper guide structure 4, a rotating shaft 5 and an oil seal 6.

[0021] Furthermore, the inner hole of the upper part of the sand-throwing ring 1 is sleeved on the outside of the rotating shaft 5, and the two are matched by a flat key. When the rotating shaft 5 works, it drives the sand-throwing ring 1 to rotate; the inner hole of the lower part of the sand-throwing ring 1 is sleeved on the outside of the upper guide structure 4, and the overlapping length of the two is 6 - 10 mm, the axial clearance is 1 - 3 mm, and the radial clearance is 0.5 - 1 mm; the inner hole boss 11 of the sand-throwing ring fits with the upper guide structure 4 and rubs against each other during rotation.

[0022] Furthermore, the clearance between the inner circle of the sealing rubber ring 2 and the rotating shaft 5 is 0.5 - 1 mm, and it does not rotate with the rotating shaft 5. The outer circle of the sealing rubber ring 2 is in interference fit with the mounting hole of the upper guide structure 4, and the sealing rubber ring 2 is axially attached to the oil seal 6.

[0023] Furthermore, the sponge pad 3 is compressed between the sealing rubber ring 2 and the oil seal 6. Thus, a sand prevention structure is formed.

[0024] When the submersible pump for wells operates, the sand-throwing ring 1 rotates with the rotating shaft 5, and the centrifugal force generated takes the sand grains with large mass away from the sand-throwing ring 1. Part of the fine sand grains enter the sand-throwing ring and are isolated from the motor cavity by the inner hole boss of the sand-throwing ring 1. A small part of the fine sand grains are squeezed into the inner cavity formed by the sand-throwing ring 1 and the sealing rubber ring 2, are driven by the rotation of the sand-throwing ring 1, and are thrown to the outer ring by the centrifugal force. An extremely small part of the sand grains enter the gap between the sealing rubber ring 2 and the rotating shaft 5 and are filtered by the sponge pad 3.

Claims

1. A sand prevention structure for a submersible pump used in a well, characterized in that: It is composed of a sand throwing ring (1), a sealing rubber ring (2), a sponge pad (3), an upper guide structure (4), a rotating shaft (5) and an oil seal (6). The inner hole at the upper part of the sand throwing ring (1) is sleeved on the outer side of the rotating shaft (5), and the two are in keyway fit. When the rotating shaft (5) works, it drives the sand throwing ring (1) to rotate. The inner hole at the lower part of the sand throwing ring (1) is sleeved on the outer side of the upper guide structure (4), and the upper guide structure (4) is inserted into the inner hole of the sand throwing ring (1). The inner hole boss (11) of the sand throwing ring fits with the upper guide structure (4). There is a gap between the sealing rubber ring (2) and the rotating shaft (5), and the outer circle of the sealing rubber ring (2) is in interference fit with the mounting hole of the upper guide structure (4). The sponge pad (3) is compressed between the sealing rubber ring (2) and the oil seal (6).

2. The anti-sand structure of a submersible pump for wells according to claim 1, wherein: The axial clearance between the sand throwing ring (1) and the upper guide structure (4) is 1 - 3 mm, the radial clearance is 0.5 - 1 mm, the insertion length of the inner hole of the sand throwing ring (1) and the upper guide structure (4) is 6 - 10 mm, and the clearance between the inner circle of the sealing rubber ring (2) and the rotating shaft (5) is 0.5 - 1 mm.

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