A vacuum pump drainage device

Abstract

This application relates to the field of vacuum pumps, and more particularly to a vacuum pump drainage device, comprising a vacuum pump, a return water pump, and a return water well. The vacuum pump, the return water pump, and the return water well are sequentially connected via a return water pipe. Multiple vacuum pumps are provided, and at least one water collection tank is provided between each vacuum pump and the return water pump. The end of the water collection tank closest to the vacuum pump is open, and the height difference between the bottoms of two adjacent water collection tanks is 10-20 cm. This application has the effect of ensuring smooth water return from the vacuum pump and eliminating air trapped in the return water pipe.

Description

Technical Field

[0001] This application relates to the field of vacuum pumps, and more particularly to a vacuum pump drainage device. Background Technology

[0002] In the alumina production process, the power source of the seed filtration system relies on the negative pressure environment generated by the vacuum pump. The efficiency of the vacuum pump directly determines the production capacity of the vertical disc filter; actual production requires the vacuum level to be stably maintained within the range of -0.05 to -0.06 MPa. To ensure the efficient operation of the vacuum pump, increasing the inlet water flow rate is the most direct and effective measure. However, the circulating water system carries a large amount of sludge over a long period, leading to severe scaling and sludge accumulation on the inner wall of the vacuum pump return water pipe; at the same time, the high return water temperature easily generates water vapor, causing an imbalance in the gas-liquid two-phase flow within the pipe, which in turn leads to fluctuations in the water supply.

[0003] On the one hand, the pipe diameter continues to shrink due to scaling and sludge buildup, limiting the flow rate; on the other hand, steam accumulation creates air resistance, further disrupting the continuity and stability of the return water. These two factors combined obstruct the flow of the vacuum pump's return water system. This exacerbates water accumulation inside the vacuum pump, significantly reducing the effective vacuum level and ultimately affecting the overall operational stability and production efficiency of the seed filtration system.

[0004] To address the issue of poor return water flow, existing technologies primarily rely on periodic high-pressure cleaning of the return water pipes. This method requires a complete shutdown of the seed filtration system, frequently interrupting production and severely impacting the stability of continuous operation. More importantly, high-pressure cleaning can only temporarily remove physical blockages in the pipe walls and cannot resolve the "air trapping" phenomenon within the pipes caused by high-temperature steam. Therefore, it fails to fundamentally address the core issues of fluctuating return water flow and decreased vacuum. Utility Model Content

[0005] In order to ensure smooth water return from the vacuum pump and eliminate air blockage in the return pipe, this application provides a vacuum pump drainage device.

[0006] This application provides a vacuum pump drainage device, which adopts the following technical solution:

[0007] A vacuum pump drainage device includes a vacuum pump, a return water pump, and a return water well. The vacuum pump, the return water pump, and the return water well are connected in sequence through a return water pipe. Multiple vacuum pumps are provided, and at least one water collection tank is provided between each vacuum pump and the return water pump.

[0008] The end of the water collection tank closest to the vacuum pump is open, and the height difference between the bottoms of two adjacent water collection tanks is 10-20cm.

[0009] By adopting the above technical solution, the end of the water collection tank near the vacuum pump is set as an open structure, allowing the water vapor carried by the vacuum pump during the return water process to escape naturally through the opening. This prevents the vapor from accumulating in the return water pipe or water collection tank and forming air resistance, thereby reducing cavitation caused by the return water pump drawing in gas and extending the service life of the return water pump. At the same time, a height difference of 10-20cm is set between the bottoms of two adjacent water collection tanks. Gravity is used to allow the return water to flow naturally from the higher water collection tank to the lower water collection tank. Through the graded collection method, the silt carried in the return water is gradually settled and concentrated at the bottom of the lower water collection tank, which facilitates the periodic centralized sludge discharge through the drain valve and prevents silt from accumulating in the return water pipe or water collection tank and causing blockage. The structure of setting up at least one water collection tank for multiple vacuum pumps enables independent collection and treatment of return water from different vacuum pumps.

[0010] Preferably, the water collection tanks are arranged side by side along the extension direction of the return water pipe toward the return water pump, and adjacent water collection tanks are connected by a connecting pipe, the height of which is higher than the highest liquid level of the water collection tank.

[0011] By adopting the above technical solution, when the vacuum pump return water enters the primary collection tank, the turbulence generated by the water flow due to the impact is dispersed and buffered by multiple collection tanks arranged in parallel, reducing the scouring force of the water flow on the bottom of the tank and reducing the phenomenon of sediment being resuspended due to disturbance. As the return water volume increases, the water level in the primary collection tank gradually rises. When it reaches the height of the connecting pipe, the water flow naturally overflows to the next stage collection tank through the connecting pipe. At the same time, the design of the connecting pipe being higher than the highest liquid level ensures that each collection tank always maintains an independent space when it is not full, and sediment cannot be back-mixed between different collection tanks through the connecting pipe. In addition, the multiple collection tanks arranged in parallel form a redundant cavity, buffering the instantaneous fluctuation of the return water flow and avoiding pressure fluctuations in the return water pipe due to excessive water volume in a short period of time.

[0012] Preferably, each of the water collection tanks has a drain outlet at the bottom, and a drain valve for periodically removing sludge is fixedly connected to the drain outlet. The drain valve is a manual gate valve or an electric butterfly valve, and the handle or drive device of the drain valve is exposed on the outer wall of the water collection tank.

[0013] By adopting the above technical solution, the silt carried by the return water will gradually settle to the bottom of the collection tank under the action of gravity. The bottom drain outlet can be directly aimed at the silt accumulation area to avoid silt residue caused by the drain outlet being too high and to prevent excessive accumulation of silt at the bottom of the tank. The drain valve adopts a combination design of manual gate valve and electric butterfly valve to take into account the needs of different usage scenarios. The manual gate valve is suitable for scenarios that require precise control of sludge discharge or temporary emergency operation, while the electric butterfly valve realizes remote or timed automatic control.

[0014] Preferably, the water collection tank includes a first-stage water tank and a second-stage water tank, with the height of the second-stage water tank farther from the return water pump being higher than the height of the second-stage water tank closer to the return water pump, and the first-stage water tank being higher than the adjacent second-stage water tank.

[0015] By adopting the above technical solution, the water flows naturally downward from the highest second-level pool to the lowest second-level pool, and then upward into the first-level pool, which is higher than the lowest second-level pool. Large particles of silt settle quickly to the bottom of the pool due to gravity, reducing the silt load of subsequent pools. After each relatively low-level second-level pool receives relatively clear water from the second-level pool at the previous height, the flow velocity is further reduced. The upper layer of relatively clear water after sedimentation in the second-level pool enters the first-level pool. The water entering the first-level pool receives the supernatant from the second-level pool adjacent to the first-level pool due to its height.

[0016] Preferably, the side wall of the water collection tank is provided with a liquid level observation window, which is made of transparent tempered glass and has scale lines marked on it.

[0017] By adopting the above technical solution, the transparent tempered glass can directly and clearly observe the water level and sediment deposition status of the return water in the pool. The marked scale lines provide a clearer reference standard for liquid level monitoring, accurately determine the timing of sludge discharge operations, and avoid excessive sediment accumulation leading to a reduction in the effective volume of the collection pool or blockage of the return water pipe.

[0018] Preferably, the inside of the water collection tank is detachably connected to a filter screen, which is horizontally positioned above the sewage outlet.

[0019] By adopting the above technical solution, when the vacuum pump return water carries impurities into the water collection tank, the horizontally arranged filter screen will first form a uniform blockage of the water flow.

[0020] Preferably, an open chute is provided between the return water pump and the return water well, the inlet end of the open chute is connected to the outlet end of the return water pump, and the outlet end of the open chute is inclined downward and connected to the return water well.

[0021] By adopting the above technical solution, when the return water pump is running, the dissolved air in the water or the steam released due to temperature changes will gather at the top of the chute because the density is less than that of water, and escape directly into the atmosphere through the opening. The open chute provides a natural venting channel for the water discharged by the return water pump. The downward sloping structure of the chute uses gravity to drive the water flow, making the water flow speed uniform and stable, and avoiding secondary suspension of silt and sand due to excessive flow speed.

[0022] Preferably, the top of the open chute is an open structure, the inclination angle of the open chute is 10°-30°, and the inner wall of the open chute is fixedly connected with an anti-corrosion lining plate.

[0023] By adopting the above technical solution, the top opening of the open chute provides a natural venting channel for the water discharged by the return pump, and the tilt angle controls the water flow rate.

[0024] Preferably, the top of the return water well is provided with a vent, the vent is covered with a dustproof net, and the bottom of the return water well is configured as a funnel-shaped structure.

[0025] By adopting the above technical solution, when the return water pump pumps back water, the water level in the well drops, creating negative pressure. External air is replenished in time through the vent, preventing the return water pipeline from collapsing or the return water pump from cavitation due to negative pressure. When the return water temperature rises or dissolved gases in the water are released, the positive pressure generated by the expansion of gas in the well can be slowly released through the vent, preventing excessive pressure in the well from causing leakage risks. The dustproof net covering effectively blocks dust and debris in the air from entering the return water well, preventing impurities from clogging the vent or settling in the well and mixing into the return water system.

[0026] Preferably, the bottom of the water collection tank is fixedly connected to a support leg, the height of the support leg is adjustable, and the bottom of the support leg is fixedly connected to an anti-slip pad.

[0027] By adopting the above technical solution, the ground in the alumina production workshop or seed filtration area may be locally tilted or uneven due to equipment installation, material transportation, etc. By adjusting the height of the support legs, the water collection pool can be kept level. The anti-slip pads at the bottom of the support legs effectively suppress the sliding of the water collection pool caused by the vibration of the vacuum pump, the impact of the return water flow, or the wet ground through high friction contact with the ground.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] 1. The end of the water collection tank closest to the vacuum pump is designed as an open structure, allowing water vapor carried by the vacuum pump during the return water process to escape naturally through the opening. This prevents steam from accumulating in the return water pipe or water collection tank, thus reducing cavitation caused by the pump drawing in gas and extending its service life. Simultaneously, a 10-20cm height difference is set between the bottoms of adjacent water collection tanks. Gravity allows the return water to flow naturally from the higher tank to the lower tank. This staged collection method gradually settles the sediment carried in the return water to the bottom of the lower tank, facilitating regular sludge removal via a drain valve. This prevents sediment buildup in the return water pipe or water collection tank from causing blockages. Multiple vacuum pumps are equipped with at least one water collection tank, enabling independent collection and treatment of return water from different vacuum pumps.

[0030] 2. Water flows naturally downwards from the highest level of the second-stage pool to the lowest level of the second-stage pool, and then upwards into the first-stage pool, which is higher than the lowest level of the second-stage pool. Large particles of silt settle quickly to the bottom of the pool due to gravity, reducing the silt load on subsequent pools. Each relatively low-level second-stage pool receives relatively clear water from the second-stage pool at the previous level, and the flow velocity further decreases. The upper layer of relatively clear water after sedimentation in the second-stage pool enters the first-stage pool. The water entering the first-stage pool receives the supernatant from the adjacent second-stage pool due to its height. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the vacuum pump drainage device in an embodiment of this application.

[0032] Explanation of reference numerals in the attached diagram: 1. Vacuum pump; 2. Return water pump; 3. Return water well; 4. Return water pipe; 5. Collection tank; 51. Sewage outlet; 52. Sewage valve; 53. First-stage water tank; 54. Second-stage water tank; 55. Liquid level observation window; 6. Open chute. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1 This application will be described in further detail.

[0034] This application discloses a vacuum pump drainage device. (Refer to...) Figure 1 The vacuum pump drainage device includes a vacuum pump 1, a return water pump 2, and a return water well 3. The vacuum pump 1, return water pump 2, and return water well 3 are connected sequentially via a return water pipe 4. Multiple vacuum pumps 1 are provided, and at least one water collection tank 5 is provided between each vacuum pump 1 and the return water pump 2. The end of the water collection tank 5 closest to the vacuum pump 1 is designed as an open structure, allowing water vapor carried by the vacuum pump 1 during the return water process to escape naturally through the open structure. This prevents steam from accumulating in the return water pipe 4 or the water collection tank 5 and forming air resistance, thereby reducing cavitation caused by the return water pump 2 drawing in gas and extending the service life of the return water pump 2.

[0035] In an optional embodiment, the end of the water collection tank 5 closest to the vacuum pump 1 is open, and the height difference between the bottoms of two adjacent water collection tanks 5 is 10-20 cm. This 10-20 cm height difference allows the return water to flow naturally from the higher water collection tank 5 to the lower water collection tank 5 using gravity. Through a graded collection method, the silt carried in the return water is gradually settled and concentrated at the bottom of the lower water collection tank 5, facilitating periodic sludge removal via the drain valve 52. This prevents silt from accumulating in the return water pipe 4 or the water collection tank 5, thus avoiding blockages. The structure of having at least one water collection tank 5 corresponding to multiple vacuum pumps 1 enables independent collection and treatment of return water from different vacuum pumps 1. In a preferred embodiment, the height difference between the bottoms of two adjacent water collection tanks 5 is 10 cm.

[0036] In an optional embodiment, the water collection tanks 5 are arranged side by side along the extension direction of the return water pipe 4 toward the return water pump 2, and adjacent water collection tanks 5 are connected by a connecting pipe, the height of which is higher than the highest liquid level of the water collection tank 5. When the return water from the vacuum pump 1 enters the first-stage water collection tank 5, the turbulence generated by the water flow due to the impact is dispersed and buffered by the multiple water collection tanks 5 arranged side by side, reducing the scouring force of the water flow on the bottom of the tank and reducing the phenomenon of silt being resuspended due to disturbance. As the return water volume increases, the water level in the first-stage water collection tank 5 gradually rises. When it reaches the height of the connecting pipe, the water flow naturally overflows to the next-stage water collection tank 5 through the connecting pipe. At the same time, the design of the connecting pipe being higher than the highest liquid level ensures that each water collection tank 5 always maintains an independent space when it is not full, and silt cannot be back-mixed between different water collection tanks 5 through the connecting pipe. In addition, the multiple water collection tanks 5 arranged side by side form a redundant cavity, buffering the instantaneous fluctuation of the return water flow and avoiding pressure fluctuations in the return water pipe 4 due to excessive water volume in a short period of time.

[0037] Each collection tank 5 has a drain outlet 51 at its bottom, and a drain valve 52 for periodic sludge removal is fixedly connected to the drain outlet 51. The drain valve 52 is either a manual gate valve or an electric butterfly valve, and the handle or drive device of the drain valve 52 is exposed on the outer wall of the collection tank 5. The sludge carried by the return water will gradually settle to the bottom of the collection tank 5 under the action of gravity. The drain outlet 51 at the bottom can be directly aimed at the area where the sludge accumulates, avoiding sludge residue caused by the drain outlet 51 being too high, and preventing excessive accumulation of sludge at the bottom of the tank. The drain valve 52 adopts a combination design of manual gate valve and electric butterfly valve to meet the needs of different usage scenarios. The manual gate valve is suitable for scenarios that require precise control of the amount of sludge discharged or temporary emergency operation, while the electric butterfly valve enables remote or timed automatic control.

[0038] The collection tank 5 includes a first-stage tank 53 and a second-stage tank 54. The height of the second-stage tank 54, which is farther from the return pump 2, is higher than that of the second-stage tank 54, which is closer to the return pump 2. The first-stage tank 53 is higher than the adjacent second-stage tank 54. Water flows naturally downward from the highest second-stage tank 54 to the lowest second-stage tank 54, and then upward into the first-stage tank 53, which is higher than the lowest second-stage tank 54. Large particles of silt settle quickly to the bottom of the tank due to gravity, reducing the silt load on subsequent tanks. Each relatively low-lying second-stage tank 54 receives relatively clear water from the second-stage tank 54 at the previous height, and the flow velocity further decreases. The upper layer of relatively clear water after sedimentation in the second-stage tank 54 enters the first-stage tank 53. The water entering the first-stage tank 53 receives the supernatant from the second-stage tank 54 adjacent to the first-stage tank 53 due to its height.

[0039] The side wall of the water collection tank 5 is equipped with a liquid level observation window 55, which is made of transparent tempered glass and marked with scale lines. The transparent tempered glass allows direct and clear observation of the water level and sediment deposition status of the return water in the tank. The marked scale lines provide a clearer reference standard for liquid level monitoring, accurately determining the timing of sludge discharge operations and preventing excessive sediment accumulation that could reduce the effective volume of the water collection tank 5 or clog the return water pipe 4. In an optional embodiment, a filter screen is detachably connected inside the water collection tank 5, and the filter screen is horizontally positioned above the drain outlet 51. When the return water from the vacuum pump 1 carries impurities into the water collection tank 5, the horizontally arranged filter screen will first uniformly block the water flow.

[0040] An open sluice 6 is provided between the return water pump 2 and the return water well 3. The inlet end of the open sluice 6 is connected to the outlet end of the return water pump 2, and the outlet end of the open sluice 6 slopes downwards and connects to the return water well 3. When the return water pump 2 is running, dissolved air in the water or vapor released due to temperature changes will accumulate at the top of the sluice due to its lower density than water, and escape directly into the atmosphere through the opening. The opening of the open sluice 6 provides a natural venting channel for the water discharged from the return water pump 2. The downward-sloping structure of the sluice uses gravity to drive the water flow, making the water flow velocity uniform and stable, and avoiding secondary suspension of sediment due to excessive flow velocity. In an optional embodiment, the top of the open sluice 6 is an open structure, the inclination angle of the open sluice 6 is 10°-30°, and the inner wall of the open sluice 6 is fixedly connected with an anti-corrosion lining plate. The top opening of the open sluice 6 provides a natural venting channel for the water discharged from the return water pump 2, and the inclination angle controls the water flow velocity.

[0041] In an optional embodiment, the top of the return water well 3 is provided with a vent, which is covered with a dustproof net. The bottom of the return water well 3 is designed with a funnel-shaped structure. When the return water pump 2 pumps return water, the water level in the well drops, creating a negative pressure. External air is replenished in time through the vent, preventing the return water pipe 4 from collapsing or the return water pump 2 from cavitation due to negative pressure. When the return water temperature rises or dissolved gases in the water are released, the positive pressure generated by the expansion of gas in the well can be slowly released through the vent, preventing excessive pressure in the well from causing leakage risks. The dustproof net effectively blocks dust and debris in the air from entering the return water well 3, preventing impurities from clogging the vent or settling in the well and mixing into the return water system. The bottom of the water collection tank 5 is fixedly connected to a support leg, the height of which is adjustable, and the bottom of the support leg is fixedly connected to an anti-slip pad. The floor of the alumina production workshop or seed filtration area may be locally tilted or uneven due to equipment installation, material transportation, etc. By adjusting the height of the support legs, the water collection tank 5 can be kept level. The anti-slip pads at the bottom of the support legs effectively suppress the sliding of the water collection tank 5 caused by the vibration of the vacuum pump 1, the impact of the return water flow, or the wet ground through high friction contact with the ground.

[0042] The implementation principle of this application embodiment is as follows: the end of the water collection tank 5 near the vacuum pump 1 is set as an open structure, so that the water vapor carried by the vacuum pump 1 during the return water process can naturally escape through the open structure, avoiding the accumulation of steam in the return water pipe 4 or the water collection tank 5 to form air resistance, thereby reducing the cavitation phenomenon caused by the return water pump 2 due to the intake of gas and extending the service life of the return water pump 2; at the same time, a height difference of 10-20cm is set between the bottoms of two adjacent water collection tanks 5, and the return water is naturally converged from the higher water collection tank 5 to the lower water collection tank 5 by gravity. Through the graded collection method, the silt carried in the return water is gradually settled and concentrated at the bottom of the lower water collection tank 5, which is convenient for the sludge to be discharged in a concentrated manner through the drain valve 52 at regular intervals, preventing the silt from accumulating in the return water pipe 4 or the water collection tank 5 and causing blockage. The structure of setting at least one water collection tank 5 for multiple vacuum pumps 1 realizes the independent collection and treatment of the return water of different vacuum pumps 1.

[0043] 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 vacuum pump drainage device, characterized in that, It includes a vacuum pump (1), a return water pump (2), and a return water well (3). The vacuum pump (1), the return water pump (2), and the return water well (3) are connected in sequence through a return water pipe (4). Multiple vacuum pumps (1) are provided, and at least one water collection tank (5) is provided between each vacuum pump (1) and the return water pump (2). Among them, the end of the water collection tank (5) near the vacuum pump (1) is open, and the height difference between the bottoms of two adjacent water collection tanks (5) is 10-20cm.

2. The vacuum pump drainage device according to claim 1, characterized in that: The water collection tanks (5) are arranged side by side along the extension direction of the return water pipe (4) toward the return water pump (2), and two adjacent water collection tanks (5) are connected by a connecting pipe, the height of which is higher than the highest liquid level of the water collection tank (5).

3. The vacuum pump drainage device according to claim 2, characterized in that: Each of the water collection tanks (5) has a drain outlet (51) at its bottom. A drain valve (52) for periodically removing sludge is fixedly connected to the drain outlet (51). The drain valve (52) is a manual gate valve or an electric butterfly valve. The handle or drive device of the drain valve (52) is exposed on the outer wall of the water collection tank (5).

4. The vacuum pump drainage device according to claim 2, characterized in that: The water collection tank (5) includes a first-stage water tank (53) and a second-stage water tank (54). The height of the second-stage water tank (54) farther away from the return water pump (2) is higher than the height of the second-stage water tank (54) closer to the return water pump (2). The first-stage water tank (53) is higher than the adjacent second-stage water tank (54).

5. The vacuum pump drainage device according to claim 2, characterized in that: The side wall of the water collection tank (5) is provided with a liquid level observation window (55), which is made of transparent tempered glass and has scale lines marked on it.

6. The vacuum pump drainage device according to claim 3, characterized in that: The water collection tank (5) is detachably connected to a filter screen, which is horizontally positioned above the drain outlet (51).

7. The vacuum pump drainage device according to claim 2, characterized in that: An open chute (6) is also provided between the return water pump (2) and the return water well (3). The inlet end of the open chute (6) is connected to the outlet end of the return water pump (2), and the outlet end of the open chute (6) is inclined downward to connect to the return water well (3).

8. The vacuum pump drainage device according to claim 7, characterized in that: The top of the open chute (6) is an open structure, the inclination angle of the open chute (6) is 10°-30°, and the inner wall of the open chute (6) is fixedly connected with an anti-corrosion liner.

9. The vacuum pump drainage device according to claim 1, characterized in that: The top of the return water well (3) is provided with a vent, and the vent is covered with a dustproof net. The bottom of the return water well (3) is set as a funnel-shaped structure.

10. The vacuum pump drainage device according to claim 1, characterized in that: The bottom of the water collection tank (5) is fixedly connected to a support leg, the height of which is adjustable, and the bottom of which is fixedly connected to an anti-slip pad.

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