A mechanically sealed, wear-resistant vertical multistage pump

Abstract

This application relates to the field of pump bodies, and more particularly to a vertical multistage pump with a wear-resistant mechanical seal, comprising a pump body, a main shaft, a mechanical seal, and a skeleton oil seal. A power chamber is formed on the surface of the pump body. The mechanical seal includes a rotating ring and a stationary ring. A fixed cavity is formed in the inner wall of the power chamber for the stationary ring to be embedded in. The rotating ring is coaxially sleeved on the outer circumferential surface of the main shaft. A lubrication cavity is formed in the inner wall of the power chamber, and the skeleton oil seal is embedded in the lubrication cavity. The lubrication cavity communicates with the fixed cavity. A lubrication gap is provided between the inner wall of the stationary ring and the outer circumferential surface of the main shaft for lubricating oil injection. The lubricating oil in the lubrication cavity enters the end faces where the stationary and rotating rings abut against each other through the lubrication gap. The skeleton oil seal and lubrication cavity in this application lubricate the end faces where the stationary and rotating rings abut against each other, preventing the mechanical seal of the vertical multistage pump from being in a dry-running state in the initial stage, reducing wear and tear on the mechanical seal, thereby reducing the replacement frequency of the mechanical seal and thus reducing the operating cost of the vertical multistage pump.

Description

Technical Field

[0001] This application relates to the field of pump bodies, and more particularly to a vertical multistage pump with a mechanical seal that is wear-resistant. Background Technology

[0002] Vertical multistage pumps generate centrifugal force through the high-speed rotation of the impeller, causing the liquid to flow along the inner wall of the pump casing and gain energy. The pressure of the liquid increases under the action of the blades, and it is lifted by passing through each stage of the impeller, ultimately achieving high-lift delivery.

[0003] Because vertical multistage pumps have a high number of impeller stages, the vertical distance between the bottom inlet and the mechanical seal is relatively large. When there is no inlet pressure or the inlet pressure is low in the pipeline, the water cannot submerge the mechanical seal, causing the mechanical seal of the vertical multistage pump to be in a dry running state in the early stage. This easily leads to wear and tear of the mechanical seal, requiring replacement, thereby increasing the operating cost of the vertical multistage pump. Utility Model Content

[0004] To address the issue of the mechanical seal of a vertical multistage pump initially being in a dry-running state, this application provides a vertical multistage pump with a wear-resistant mechanical seal.

[0005] This application provides a mechanically sealed, wear-resistant vertical multistage pump, which adopts the following technical solution:

[0006] A wear-resistant vertical multistage pump with a mechanical seal includes a pump body, a main shaft, a mechanical seal, and a skeleton oil seal. The pump body surface has a power chamber for rotating the main shaft. The mechanical seal includes a rotating ring and a stationary ring. The inner wall of the power chamber has a fixed cavity for the stationary ring to be embedded in. The end face of the stationary ring abuts against the inner wall of the fixed cavity to form a seal. The rotating ring is coaxially sleeved on the outer circumferential surface of the main shaft, and the end face of the stationary ring abuts against the end face of the rotating ring to form a seal. The inner wall of the power chamber has a lubrication cavity for injecting lubricating oil. The skeleton oil seal is embedded in the lubrication cavity, and the outer circumferential surface of the skeleton oil seal abuts against the inner wall of the lubrication cavity to form a seal. The sealing lip of the skeleton oil seal abuts against the outer circumferential surface of the main shaft to form a seal. The lubrication cavity communicates with the fixed cavity. A lubrication gap is provided between the inner wall of the stationary ring and the outer circumferential surface of the main shaft for lubrication oil injection. The lubricating oil in the lubrication cavity enters the end faces of the stationary ring and the rotating ring that abut against each other through the lubrication gap.

[0007] By adopting the above technical solution, when using the vertical multistage pump, the user injects lubricating oil into the lubrication chamber. The lubricating oil in the lubrication chamber enters the end face where the stationary ring and the rotating ring abut against each other through the lubrication gap, lubricating the end face where the stationary ring and the rotating ring abut against each other. This avoids the mechanical seal of the vertical multistage pump being in a dry running state in the initial stage, reduces the wear and loss of the mechanical seal, thereby reducing the replacement frequency of the mechanical seal and thus reducing the operating cost of the vertical multistage pump. At the same time, the skeleton oil seal is embedded in the lubrication chamber, and the outer peripheral surface of the skeleton oil seal abuts against the inner wall of the lubrication chamber to form a seal. The sealing lip of the skeleton oil seal abuts against the outer peripheral surface of the main shaft to form a seal, making it difficult for the lubricating oil in the lubrication chamber to overflow, thereby ensuring the stability of the lubricating oil stored in the lubrication chamber.

[0008] Optionally, the outer circumferential surface of the stationary ring is connected with multiple sealing rings at intervals. The arrangement direction of the sealing rings is parallel to the axis of the main shaft, and the outer circumferential surface of the sealing rings abuts against the inner wall of the fixed cavity to form a seal.

[0009] By adopting the above technical solution, multiple sealing rings are connected at intervals on the outer circumferential surface of the stationary ring, and the outer circumferential surface of the sealing ring abuts against the inner wall of the fixed cavity to form a seal. This makes it difficult for the lubricating oil in the lubrication gap to overflow from the abutting point between the outer circumferential surface of the stationary ring and the inner wall of the fixed cavity, ensuring that the lubricating oil in the lubrication gap can stably enter the abutting end face of the stationary ring and the rotating ring, thereby improving the stability of lubrication of the abutting end face of the stationary ring and the rotating ring.

[0010] Optionally, the moving ring has a heat dissipation cavity coaxially formed on the inner wall of the stationary ring for injecting lubricating oil.

[0011] By adopting the above technical solution, the heat dissipation cavity is located in the layer facing the stationary ring from the moving ring. The lubricating oil in the lubrication gap is injected into the heat dissipation cavity, and the inner wall of the heat dissipation cavity is in full contact with the lubricating oil and heat exchange occurs, increasing the contact area between the lubricating oil and the moving ring, thereby improving the cooling efficiency of the moving ring and making it less likely for the moving ring to operate at a high temperature for a long time and wear out, thereby further extending the service life of the mechanical seal.

[0012] Optionally, the mechanical seal further includes an elastic element and a fixed ring. The fixed ring is coaxially connected to the outer circumferential surface of the main shaft. One end of the elastic element in the direction of elastic force is connected to the end face of the fixed ring, and the other end of the elastic element in the direction of elastic force is connected to the end face of the rotating ring. The elastic element has the tendency to drive the rotating ring closer to the stationary ring with its elastic force, and the end face of the rotating ring abuts against the end face of the stationary ring.

[0013] By adopting the above technical solution, one end of the elastic element in the direction of elastic force is connected to the end face of the fixed ring, and the other end of the elastic element in the direction of elastic force is connected to the end face of the rotating ring. The elastic force of the elastic element drives the rotating ring to approach the stationary ring, and the end face of the rotating ring presses against the end face of the stationary ring, ensuring the stability of the seal formed by the mutual pressing of the end faces of the stationary ring and the rotating ring.

[0014] Optionally, the outer circumferential surface of the moving ring is provided with a positioning cavity for the end of the elastic element to be sleeved, and the bottom wall of the positioning cavity abuts against the end of the elastic element to form a positioning.

[0015] By adopting the above technical solution, one end of the elastic element in the direction of elastic force is sleeved in the positioning cavity, and the bottom wall of the positioning cavity abuts against the end of the elastic element to form a positioning, making it difficult for the elastic element to detach from the moving ring, thereby improving the stability of the elastic element applying pressure to the moving ring.

[0016] Optionally, the pump body has an inlet and an outlet, the power chamber connects the inlet and the outlet, and the height of the outlet orifice is higher than the height of the fixed chamber orifice. Multiple impellers are coaxially connected at intervals on the surface of the main shaft. The main shaft drives the impellers to rotate, driving water through the inlet and the power chamber and out of the outlet.

[0017] By adopting the above technical solution, the main shaft drives the impeller to rotate, driving water through the inlet and power chamber and out of the outlet, achieving high-lift water delivery. The outlet is higher than the fixed chamber opening, allowing the residual liquid in the power chamber to flow back and impact the stationary and rotating rings under gravity, providing a good lubrication environment for the stationary and rotating rings, reducing wear on the sealing end faces of the stationary and rotating rings, and thus extending the service life of the mechanical seal.

[0018] Optionally, the pump body is connected to a power motor, the main shaft axis coincides with the power motor axis, and a coupling connects the main shaft and the power motor axis.

[0019] By adopting the above technical solution, the coupling is connected between the main shaft and the motor shaft of the power motor, realizing the separate connection between the main shaft and the power motor, thereby facilitating the maintenance and cleaning of the pump body.

[0020] Optionally, the pump body has a relief cavity for accommodating the coupling on the surface facing the power motor. The relief cavity is connected to the lubrication cavity. The outer peripheral surface of the pump body has multiple heat dissipation grooves spaced apart, and all of the heat dissipation grooves are connected to the relief cavity.

[0021] By adopting the above technical solution, the coupling rotates within the clearance cavity, reducing the probability of wear caused by contact between the coupling and the pump body. At the same time, the clearance cavity connects the heat dissipation groove and the lubrication cavity, allowing users to inject lubricating oil into the lubrication cavity through the heat dissipation groove and the clearance cavity, thereby improving the ease of use of multi-stage pumps.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] 1. The inclusion of a skeleton oil seal and a lubrication chamber lubricates the end faces where the stationary and rotating rings abut against each other, preventing the mechanical seal of the vertical multistage pump from being in a dry-running state in the initial stage, reducing wear and tear on the mechanical seal, thereby reducing the frequency of mechanical seal replacement and thus lowering the operating cost of the vertical multistage pump.

[0024] 2. The sealing ring ensures that the lubricating oil in the lubrication gap can stably enter the end faces of the stationary ring and the rotating ring that are pressed together, thereby improving the stability of lubrication of the end faces of the stationary ring and the rotating ring that are pressed together.

[0025] 3. The heat dissipation cavity is designed to improve the cooling efficiency of the rotating ring, making it less likely for the rotating ring to operate at high temperatures for extended periods and thus wear out, thereby further extending the service life of the mechanical seal. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure in an embodiment of this application.

[0027] Figure 2 This is a cross-sectional view of an embodiment of this application, mainly showing the impeller.

[0028] Figure 3 yes Figure 2 The enlarged view at point A in the middle mainly shows the mechanical seal.

[0029] Explanation of reference numerals in the attached drawings: 1. Pump body; 11. Power chamber; 12. Fixed chamber; 13. Lubrication chamber; 14. Clearance chamber; 15. Heat dissipation groove; 16. Inlet; 17. Outlet; 2. Main shaft; 3. Mechanical seal; 31. Dynamic ring; 311. Positioning chamber; 312. Heat dissipation chamber; 32. Stationary ring; 321. Lubrication gap; 33. Elastic element; 34. Fixed ring; 4. Skeleton oil seal; 5. Sealing ring; 6. Power motor; 7. Coupling; 8. Impeller. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0031] This application discloses a mechanically sealed, wear-resistant vertical multistage pump. (Refer to...) Figure 1 and Figure 2 A wear-resistant vertical multistage pump with a mechanical seal includes a pump body 1, a main shaft 2, a mechanical seal 3 and a skeleton oil seal 4. The surface of the pump body 1 is provided with a power chamber 11 for the main shaft 2 to rotate.

[0032] Reference Figure 2 and Figure 3The mechanical seal 3 includes a dynamic ring 31, a stationary ring 32, an elastic element 33, and a fixed ring 34. The inner wall of the dynamic chamber 11 has a fixed cavity 12 for the stationary ring 32 to be embedded. The end face of the stationary ring 32 abuts against the bottom wall of the fixed cavity 12 to form a seal. The axis of the stationary ring 32 coincides with the axis of the main shaft 2. Multiple sealing rings 5 ​​are connected at intervals on the outer circumferential surface of the stationary ring 32. The arrangement direction of the sealing rings 5 ​​is parallel to the axis of the stationary ring 32. The outer circumferential surface of the sealing rings 5 ​​abuts against the inner wall of the fixed cavity 12 to form a seal.

[0033] Reference Figure 2 and Figure 3 The rotating ring 31 is coaxially sleeved on the outer circumferential surface of the main shaft 2. The end face of the rotating ring 31 and the bottom wall of the fixed cavity 12 clamp the two sides of the stationary ring 32 in the axial direction to form a seal. The inner ring wall of the fixed ring 34 is coaxially connected to the outer circumferential surface of the main shaft 2. The fixed ring 34 is located on the side of the rotating ring 31 away from the stationary ring 32. The elastic element 33 can be a compression spring or a tension spring. In this embodiment, the elastic element 33 is a compression spring with a certain deformation capability. One end of the elastic element 33 in the elastic force direction abuts against the end face of the fixed ring 34, and the other end of the elastic element 33 in the elastic force direction abuts against the end face of the rotating ring 31 away from the stationary ring 32 in the axial direction. The elastic element 33 has the tendency to drive the rotating ring 31 closer to the stationary ring 32 with its elastic force, and the end face of the rotating ring 31 abuts against the end face of the stationary ring 32 to form a seal.

[0034] Reference Figure 2 and Figure 3 The moving ring 31 has a positioning cavity 311 coaxially opened on the outer peripheral surface of the fixed ring 34 for the end of the elastic member 33 to be sleeved. The bottom wall of the positioning cavity 311 abuts against the end of the elastic member 33 to form a positioning, so that the elastic member 33 is not easy to detach from the moving ring 31, thereby ensuring the stability of the pressure applied by the elastic member 33 to the moving ring 31.

[0035] Reference Figure 2 and Figure 3 The inner wall of the power chamber 11 is provided with a lubrication chamber 13 for injecting lubricating oil. The axis of the lubrication chamber 13 coincides with the axis of the main shaft 2. The lubricating oil in the lubrication chamber 13 can fully contact the main shaft 2 and exchange heat to achieve cooling of the main shaft 2, thereby ensuring the stability of the main shaft 2 operation. The skeleton oil seal 4 is coaxially embedded in the opening of the lubrication chamber 13 away from the stationary ring 32. The outer peripheral surface of the skeleton oil seal 4 abuts against the inner wall of the lubrication chamber 13 to form a seal, and the sealing lip of the skeleton oil seal 4 abuts against the outer peripheral surface of the main shaft 2 to form a seal, thereby achieving sealed storage of lubricating oil in the lubrication chamber 13.

[0036] Reference Figure 2 and Figure 3The lubrication chamber 13 is connected to the fixed chamber 12. A lubrication gap 321 for lubricating oil injection is left between the inner wall of the stationary ring 32 and the outer circumferential surface of the main shaft 2. The rotating ring 31 has a heat dissipation chamber 312 for lubricating oil injection on the inner wall facing the lubrication gap 321. The lubricating oil in the lubrication chamber 13 is injected into the heat dissipation chamber 312 and the end faces of the stationary ring 32 and the rotating ring 31 that are pressed together through the lubrication gap 321. This lubricates the end faces of the stationary ring 32 and the rotating ring 31 that are pressed together, avoiding the situation where the mechanical seal 3 of the vertical multistage pump is in a dry running state in the early stage, reducing the wear and loss of the mechanical seal 3, thereby reducing the replacement frequency of the mechanical seal 3 and thus reducing the operating cost of the vertical multistage pump. At the same time, the inner wall of the heat dissipation chamber 312 is in full contact with the lubricating oil and exchanges heat, thereby improving the cooling efficiency of the rotating ring 31, making the rotating ring 31 less likely to operate at high temperature and wear out, thereby extending the service life of the mechanical seal 3.

[0037] Reference Figure 1 and Figure 2 The pump body 1 is fixed with a power motor 6 by bolts. The power motor 6 is located on the side of the fixed cavity 12 away from the power cavity 11. The motor axis of the power motor 6 coincides with the axis of the main shaft 2. A coupling 7 is connected between the main shaft 2 and the motor axis of the power motor 6 to realize the separate installation of the main shaft 2 and the power motor 6, so as to facilitate the user to replace and maintain the main shaft 2 and the power motor 6.

[0038] Reference Figure 1 and Figure 2 The pump body 1 has a relief cavity 14 on the surface facing the power motor 6 for the coupling 7 to rotate. The relief cavity 14 is connected to the lubrication cavity 13. The outer circumferential surface of the pump body 1 is provided with multiple heat dissipation grooves 15, which are all connected to the relief cavity 14. This allows the user to inject lubricating oil into the lubrication cavity 13 through the heat dissipation grooves 15 and the relief cavity 14, thereby improving the ease of use of the multi-stage pump.

[0039] Reference Figure 2 and Figure 3 The pump body 1 has an inlet 16 and an outlet 17. The power chamber 11 connects the inlet 16 and the outlet 17, and the height of the outlet 17 is higher than the height of the fixed chamber 12. Multiple impellers 8 are coaxially connected at intervals on the surface of the main shaft 2. The power motor 6 drives the main shaft 2 to rotate in the power chamber 11 through the coupling 7. The main shaft 2 drives the multiple impellers 8 to rotate, driving water to pass through the inlet 16 and the power chamber 11 in sequence and be discharged from the outlet 17, realizing high-lift water delivery. The outlet 17 is higher than the height of the fixed chamber 12, which allows the liquid remaining in the power chamber 11 to flow back and impact the stationary ring 32 and the rotating ring 31 under the action of gravity, providing a good lubrication environment for the stationary ring 32 and the rotating ring 31, reducing the wear of the sealing end faces of the stationary ring 32 and the rotating ring 31, thereby extending the service life of the mechanical seal 3.

[0040] The implementation principle of a wear-resistant vertical multistage pump with a mechanical seal in this application embodiment is as follows: Before using the vertical multistage pump, lubricating oil is injected into the lubrication chamber 13. The lubricating oil in the lubrication chamber 13 is injected into the heat dissipation chamber 312 and the end faces of the stationary ring 32 and the rotating ring 31 that are pressed together through the lubrication gap 321, so as to lubricate the end faces of the stationary ring 32 and the rotating ring 31 that are pressed together, thereby avoiding the situation where the mechanical seal 3 of the vertical multistage pump is in a dry running state in the early stage, reducing the wear and loss of the mechanical seal 3, thereby reducing the replacement frequency of the mechanical seal 3, and thus reducing the operating cost of the vertical multistage pump.

[0041] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A mechanically sealed, wear-resistant vertical multistage pump, characterized in that: The system includes a pump body (1), a main shaft (2), a mechanical seal (3), and a skeleton oil seal (4). The pump body (1) has a power chamber (11) on its surface for the main shaft (2) to rotate. The mechanical seal (3) includes a rotating ring (31) and a stationary ring (32). The inner wall of the power chamber (11) has a fixed cavity (12) for the stationary ring (32) to be embedded in. The end face of the stationary ring (32) abuts against the inner wall of the fixed cavity (12) to form a seal. The rotating ring (31) is coaxially sleeved on the outer circumference of the main shaft (2), and the end face of the stationary ring (32) abuts against the end face of the rotating ring (31) to form a seal. The inner wall of the power chamber (11) A lubrication cavity (13) for injecting lubricating oil is provided. The skeleton oil seal (4) is embedded in the lubrication cavity (13). The outer peripheral surface of the skeleton oil seal (4) abuts against the inner wall of the lubrication cavity (13) to form a seal. The sealing lip of the skeleton oil seal (4) abuts against the outer peripheral surface of the main shaft (2) to form a seal. The lubrication cavity (13) is connected to the fixed cavity (12). A lubrication gap (321) for injecting lubricating oil is left between the inner wall of the stationary ring (32) and the outer peripheral surface of the main shaft (2). The lubricating oil in the lubrication cavity (13) enters the end face of the stationary ring (32) and the moving ring (31) abutting against each other through the lubrication gap (321).

2. The mechanically sealed, wear-resistant vertical multistage pump according to claim 1, characterized in that: The outer circumferential surface of the stationary ring (32) is connected with multiple sealing rings (5) at intervals. The arrangement direction of the sealing rings (5) is parallel to the axis of the main shaft (2), and the outer circumferential surface of the sealing rings (5) abuts against the inner wall of the fixed cavity (12) to form a seal.

3. The mechanically sealed, wear-resistant vertical multistage pump according to claim 1, characterized in that: The moving ring (31) has a heat dissipation cavity (312) coaxially opened on the inner ring wall facing the stationary ring (32) for injecting lubricating oil.

4. The mechanically sealed, wear-resistant vertical multistage pump according to claim 1, characterized in that: The mechanical seal (3) further includes an elastic element (33) and a fixed ring (34). The fixed ring (34) is coaxially connected to the outer circumferential surface of the main shaft (2). One end of the elastic element (33) in the elastic direction is connected to the end face of the fixed ring (34), and the other end of the elastic element (33) in the elastic direction is connected to the end face of the moving ring (31). The elastic element (33) has the tendency to drive the moving ring (31) closer to the stationary ring (32) with elastic force, and the end face of the moving ring (31) abuts against the end face of the stationary ring (32).

5. A mechanically sealed, wear-resistant vertical multistage pump according to claim 4, characterized in that: The outer circumferential surface of the moving ring (31) is provided with a positioning cavity (311) for the end of the elastic element (33) to be fitted. The bottom wall of the positioning cavity (311) abuts against the end of the elastic element (33) to form a positioning.

6. A mechanically sealed, wear-resistant vertical multistage pump according to claim 1, characterized in that: The pump body (1) has an inlet (16) and an outlet (17). The power chamber (11) is connected to the inlet (16) and the outlet (17). The height of the outlet (17) is higher than the height of the fixed chamber (12). Multiple impellers (8) are coaxially connected at intervals on the surface of the main shaft (2). The main shaft (2) drives the impellers (8) to rotate, driving water through the inlet (16) and the power chamber (11) and out of the outlet (17).

7. A mechanically sealed, wear-resistant vertical multistage pump according to claim 1, characterized in that: The pump body (1) is connected to a power motor (6), the axis of the main shaft (2) coincides with the axis of the power motor (6), and a coupling (7) is connected between the main shaft (2) and the motor shaft of the power motor (6).

8. A mechanically sealed, wear-resistant vertical multistage pump according to claim 7, characterized in that: The pump body (1) has a relief cavity (14) for accommodating the coupling (7) on the surface facing the power motor (6). The relief cavity (14) is connected to the lubrication cavity (13). The outer circumferential surface of the pump body (1) is provided with a plurality of heat dissipation grooves (15) at intervals, and the plurality of heat dissipation grooves (15) are all connected to the relief cavity (14).

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