Submersible pump bearing sealing structure

Abstract

The utility model provides a bearing sealing structure of a submersible pump. The bearing sealing structure of the submersible pump comprises a bearing cover, a gland, a main shaft, a water-free mechanical seal and an outer cavity shell. According to the submersible pump bearing sealing structure, the bearing cover is arranged, and the mounting hole used for mounting the bearing is formed in the bearing cover. An outer ring of the bearing is fixedly installed on the bearing cover, and the main shaft is fixedly installed on an inner ring of the bearing. According to the application, the water-free mechanical seal is arranged between the main shaft and the gland, and the water-free mechanical seal is respectively connected with the main shaft and the gland in a sealing manner, so that a first seal is formed. An oil seal is installed between the main shaft and the gland, and a second seal is formed through the oil seal. The outer side of the water-free mechanical seal and the outer side of the gland are further covered with the outer cavity shell, through the two sealing structures of the oil seal and the water-free mechanical seal, the sealing effect on the bearing can be effectively improved, external water vapor or particles are prevented from entering the bearing to damage the bearing, and then the service life of the submersible pump is prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of submersible pump technology, specifically relating to a submersible pump bearing sealing structure. Background Technology

[0002] Submersible pumps are widely used underwater processing tools, primarily for transporting silt and sediment from inland river channels and port riverbeds, as well as for conveying mud and silt at bridge and road construction sites. Their working principle involves an electric motor or hydraulic motor driving an impeller at high speed via a pump shaft, converting mechanical energy into hydraulic energy to transport the liquid to its destination. Because submersible pumps operate underwater, the sealing structure of their bearings is particularly important. Currently, the conventional sealing methods for submersible pumps are oil seals or sealing rings; however, with prolonged use, both are prone to aging, leading to bearing seal failure and thus affecting the service life of the submersible pump. Utility Model Content

[0003] This utility model provides a submersible pump bearing sealing structure, which aims to solve the problem of poor bearing sealing effect on submersible pumps affecting their service life in the prior art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a submersible pump bearing sealing structure, comprising:

[0005] A bearing cover, wherein the bearing cover is provided with mounting holes for mounting bearings;

[0006] A pressure cap, which is sealed to the bearing cover, is used to confine the bearing inside the mounting hole;

[0007] The main shaft is connected to the inner ring of the bearing, and an oil seal is provided between the main shaft and the pressure cap;

[0008] An anhydrous mechanical seal is installed between the main shaft and the pressure cover, and is respectively sealed to the main shaft and the pressure cover;

[0009] The outer housing covers the outside of the waterless mechanical seal and the pressure cap, and is sealed to the bearing cover.

[0010] In one possible implementation, a bushing is also fitted on the outside of the spindle, and the bushing is respectively connected to the waterless mechanical seal and the spindle seal.

[0011] In one possible implementation, a retaining sleeve is sealed to one end of the bushing near the bearing, the retaining sleeve abutting against the bearing, and a pressure ring for pressing the bushing against the retaining sleeve is also installed on the spindle.

[0012] In one possible implementation, the oil seal is installed between the retaining sleeve and the gland.

[0013] In one possible implementation, the bushing includes a plurality of sleeves arranged sequentially adjacent to each other along the axis of the main shaft, with a first sealing ring disposed between two adjacent sleeves, and the first sealing ring being fitted onto the outside of the main shaft.

[0014] In one possible implementation, the gland is provided with a flange for fixing to the bearing cover, and a second sealing ring is also provided between the flange and the bearing cover.

[0015] In one possible implementation, the side of the gland is provided with a guide ring that slides in conjunction with the mounting hole.

[0016] In one possible implementation, a third sealing ring is installed at both ends of the bushing, and the third sealing ring is sealed to the main shaft.

[0017] In one possible implementation, the end of the waterless mechanical seal near the bearing is sealed to the bushing, and the outer housing is provided with at least one vent hole.

[0018] The solution shown in this application, compared with the prior art, features a bearing cover with mounting holes for installing the bearing. The outer ring of the bearing is fixed to the bearing cover, and the main shaft is fixed to the inner ring of the bearing. A pressure cap is installed below the bearing cover, forming a sealed connection with it, and the pressure cap is used to confine the bearing within the mounting holes. This application also includes a waterless mechanical seal installed between the main shaft and the pressure cap, forming a first seal. An oil seal is installed between the main shaft and the pressure cap, forming a second seal. An outer housing is also provided outside the waterless mechanical seal and the pressure cap. This dual-seal structure of the oil seal and the waterless mechanical seal effectively improves the sealing effect on the bearing, preventing external moisture or particles from entering and damaging the bearing. This, in turn, extends the service life of the submersible pump. Attached Figure Description

[0019] Figure 1 A schematic diagram of the submersible pump bearing sealing structure provided in this embodiment of the utility model;

[0020] Figure 2 for Figure 1 A magnified view of part A in the middle.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Bearing cover; 2. Gland; 21. Flange; 22. Second sealing ring; 23. Guide ring; 3. Main shaft; 4. Anhydrous mechanical seal; 5. Outer cavity housing; 6. Bushing; 61. Retaining sleeve; 62. First sealing ring; 621. Third sealing ring; 7. Oil seal. Detailed Implementation

[0023] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0024] Please refer to the following: Figure 1 and Figure 2 The submersible pump bearing sealing structure provided by this utility model will now be described. The submersible pump bearing sealing structure includes a bearing cover 1, a pressure cap 2, a main shaft 3, a waterless mechanical seal 4, and an outer housing 5. The bearing cover 1 has a mounting hole for installing the bearing; the pressure cap 2 is sealed to the bearing cover 1 to confine the bearing inside the mounting hole; the main shaft 3 is connected to the inner ring of the bearing, and an oil seal 7 is provided between the main shaft 3 and the pressure cap 2; the waterless mechanical seal 4 is installed between the main shaft 3 and the pressure cap 2, and is sealed to both the main shaft 3 and the pressure cap 2; the outer housing 5 covers the outside of the waterless mechanical seal 4 and the pressure cap 2.

[0025] The submersible pump bearing sealing structure provided in this embodiment, compared with the prior art, includes a bearing cover 1 with mounting holes for installing the bearing. The outer ring of the bearing is fixed to the bearing cover 1, and the main shaft 3 is fixed to the inner ring of the bearing. A pressure cap 2 is installed below the bearing cover 1, forming a sealing connection between the pressure cap 2 and the bearing cover 1, and the pressure cap 2 is used to limit the bearing inside the mounting holes. In this application, a waterless mechanical seal 4 is installed between the main shaft 3 and the pressure cap 2, forming a first seal by sealing the main shaft 3 and the pressure cap 2. An oil seal 7 is installed between the main shaft 3 and the pressure cap 2, forming a second seal. An outer cavity shell 5 is also provided outside the waterless mechanical seal 4 and the pressure cap 2. Through the two sealing structures of the oil seal 7 and the waterless mechanical seal, the sealing effect on the bearing can be effectively improved, preventing external moisture or particles from entering the bearing and damaging it. This, in turn, improves the service life of the submersible pump.

[0026] In some embodiments, the spindle 3 described above can be as follows: Figure 2 The structure shown. See also Figure 2A bushing 6 is fitted onto the outer side of the main shaft 3, and the bushing 6 is sealed to both the waterless mechanical seal 4 and the main shaft 3. The bushing 6 is fixedly installed on the outer side of the main shaft 3 and rotates with the main shaft 3. This provides some protection for the main shaft 3. The bushing 6 is sealed to both the main shaft 3 and the waterless mechanical seal 4. Thus, a sealed connection between the main shaft 3 and the waterless mechanical seal 4 is achieved through the bushing 6.

[0027] In some embodiments, the bushing 6 may be adopted as follows: Figure 2 The structure shown. See also Figure 2 The bushing 6 has a retainer 61 sealed to one end near the bearing. The retainer 61 abuts against the bearing. A pressure ring (not shown in the figure) is also installed on the main shaft 3 to press the bushing 6 against the retainer 61. The bushing 6 is located in the middle of the main shaft 3, and the retainer 61 is installed at the top of the bushing 6. The retainer 61 is located between the bushing 6 and the inner ring of the bearing. A pressure ring is also provided on the main shaft 3. The bushing 6 and the retainer 61 are pressed between the pressure ring and the inner ring of the bearing, and the pressure ring can fix the bushing 6 and the retainer 61 to the main shaft 3.

[0028] Specifically, in this embodiment, the bushing 6 is clearance-fitted with the main shaft 3, and the pressure ring is threaded onto the main shaft 3, so that the bushing 6 and the retaining sleeve 61 can be pressed against the inner ring of the bearing, thereby achieving the fixation between the main shaft 3 and the bushing 6 and the retaining sleeve 61.

[0029] Optionally, in this embodiment, the pressure ring can be a retaining ring. An annular groove for accommodating the retaining ring is provided on the main shaft 3. The retaining ring can limit the bushing 6 and the retaining sleeve 61 to the inner ring of the bearing.

[0030] In some embodiments, the bushing 6 may be adopted as follows: Figure 2 The structure shown. See also Figure 2 The bushing 6 includes multiple sleeves arranged adjacent to each other along the axis of the main shaft 3. A first sealing ring 62 is provided between two adjacent sleeves, and the first sealing ring 62 is fitted onto the outside of the main shaft 3. The bushing 6 includes multiple sleeves arranged adjacent to each other along the axis of the main shaft 3. A first sealing ring 62 is provided between each two adjacent sleeves to seal the gap between the two adjacent sleeves, thereby ensuring the sealing effect between the two sleeves.

[0031] Specifically, in this embodiment, an installation groove for installing the first sealing ring 62 is provided at one end of the sleeve, which can be combined with the adjacent sleeve to form a sealing structure.

[0032] Preferably, in this embodiment, by using multiple sleeves, the sleeve located in the middle cooperates with the waterless mechanical seal 4, and the outer diameter of the sleeve at this location can be processed separately, thereby facilitating the processing of the sleeve and making it easy to ensure the outer diameter of the sleeve.

[0033] In some embodiments, the aforementioned gland 2 may be adopted as follows: Figure 2 The structure shown. See also Figure 2 The gland 2 is provided with a flange 21 for fixing to the bearing cover 1, and a second sealing ring 22 is also provided between the flange 21 and the bearing cover 1. The flange 21 is provided on one side of the gland 2 for fixing to the bearing cover 1. The flange 21 is fixed to the bearing cover 1 with bolts, and a second sealing ring 22 is provided between the flange 21 and the bearing cover 1. The flange 21 facilitates the fixing of the gland 2 to the bearing cover 1 and provides a seal through the second sealing ring 22. The structure is simple and facilitates the overall assembly of the submersible pump.

[0034] In some embodiments, the aforementioned gland 2 may be adopted as follows: Figure 2 The structure shown. See also Figure 2 The side of the pressure cap 2 has a protruding guide ring 23 that slides into the mounting hole. The guide ring 23 is coaxially aligned with the mounting hole of the oil seal 7 on the pressure cap 2, and slides into the bearing, ensuring that the oil seal 7 and the bearing are coaxially aligned later. Simultaneously, the guide ring 23 presses against the outer ring of the bearing, thus securing the bearing to the bearing cover 1.

[0035] In some embodiments, the bushing 6 may be adopted as follows: Figure 2 The structure shown. See also Figure 2 Both ends of the bushing 6 are equipped with a third sealing ring 621, which is sealed to the main shaft 3. An annular groove for installing the third sealing ring 621 is provided at both ends of the bushing 6. The annular groove is located on the inner wall of the bushing 6, so that when the third sealing ring 621 is installed inside the annular groove, it can abut against the outer wall of the main shaft 3 and be squeezed by the retaining sleeve 61 and the pressure ring, thus achieving a seal between the main shaft 3 and the bushing 6.

[0036] In some embodiments, the aforementioned waterless mechanical seal 4 can be adopted as follows: Figure 2 The structure shown. See also Figure 2 The anhydrous mechanical seal 4 is sealed to the bushing 6 at one end near the bearing, and at least one vent hole is provided on the outer housing 5. The top end of the anhydrous mechanical seal 4 is sealed to the bushing 6, providing a single-layer seal. Simultaneously, the bottom end of the anhydrous mechanical seal 4 rotatably engages with the bushing 6, and a vent hole is provided on the side wall of the outer housing 5. The vent hole allows air to be expelled from inside the outer housing 5, allowing liquid to flow into the outer housing 5, facilitating drainage and venting. It also helps to remove heat generated by the friction pair, preventing burn-out and thus extending the service life of the anhydrous mechanical seal 4.

[0037] Specifically, in this embodiment, the waterless mechanical seal 4 is mounted on the gland 2 via a flange, and the end face of the waterless mechanical seal 4 protrudes from the flange and is provided with a guide portion. A guide hole for installing the guide portion is provided on the gland 2. A fourth sealing ring is installed on the guide portion, and the sealing connection between the waterless mechanical seal 4 and the bushing 6 is achieved through the fourth sealing ring. Simultaneously, the gland 2 guides and cooperates with both the waterless mechanical seal 4 and the bearing cover 1, thereby ensuring the coaxiality between the waterless mechanical seal 4, the oil seal 7, and the bearing.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements 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 submersible pump bearing seal structure, characterized by, The utility model provides a bearing cover (1) is provided with the installation hole for installing bearing on the bearing cover (1), gland (2) is sealedly connected with bearing cover (1), is used for limiting bearing in the installation hole inside, the main shaft (3) is connected with the inner ring of bearing, and the oil seal (7) is arranged between the main shaft (3) and the gland (2), the waterless machine seal (4) is installed between the main shaft (3) and the gland (2), and is sealedly connected with the main shaft (3) and the gland (2) respectively, the outer cavity shell (5) is covered in the outer side of waterless machine seal (4) and the gland (2). The outer side of the main shaft (3) is also sleeved with a shaft sleeve (6) that is sealedly connected with the waterless machine seal (4) and the main shaft (3) respectively. The shaft sleeve (6) is sealedly connected with a baffle sleeve (61) at one end close to the bearing, the baffle sleeve (61) abuts against the bearing, and the main shaft (3) is also provided with a pressing ring for tightly pressing the shaft sleeve (6) against the baffle sleeve (61). The oil seal (7) is installed between the baffle sleeve (61) and the gland (2). The shaft sleeve (6) includes a plurality of sleeve pipes that are sequentially and adjacently arranged along the axis direction of the main shaft (3), a first sealing ring (62) is arranged between two adjacent sleeve pipes, and the first sealing ring (62) is sleeved outside the main shaft (3). The gland (2) is provided with a flange plate (21) for being fixed to the bearing cover (1), and a second sealing ring (22) is further arranged between the flange plate (21) and the bearing cover (1).

2. The submersible pump bearing seal structure of claim 1, wherein, The side surface of the gland (2) is protrudingly provided with a guide ring (23) that is slidingly matched with the installation hole.

3. The submersible pump bearing seal structure of claim 2, wherein, Both ends of the shaft sleeve (6) are provided with a third sealing ring (621) that is sealedly connected with the main shaft (3).

4. The submersible pump bearing seal structure of claim 3, wherein, The waterless machine seal (4) is sealedly connected with the shaft sleeve (6) at one end close to the bearing, and the outer cavity shell (5) is provided with at least one exhaust hole.

5. The submersible pump bearing seal structure of claim 2, wherein, ​ 6. The submersible pump bearing seal structure of claim 1, wherein, ​ 7. The submersible pump bearing seal structure of claim 1 or 6, wherein, ​ 8. The submersible pump bearing seal structure of claim 2, wherein, ​ 9. The submersible pump bearing seal structure of claim 2, wherein, ​

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