阅读说明：本技术 一种设有提液器的离心泵系统及其工作方法 (Centrifugal pump system with liquid extractor and working method thereof ) 是由 高翔 张丽霞 于 2020-11-26 设计创作，主要内容包括：本发明为一种设有提液器的离心泵系统及其工作方法,离心泵系统包括离心泵、抽吸管道及与输出管道,其特征在于：所述离心泵系统设有提液器,所述的抽吸管道与设置于水池底部的提液器的出口连通,所述离心泵出口处还设有通过三通与输出管道连接的回流管道,所述的提液器从上至下顺序包括管径上大下小且与抽吸管道连通的扩大管、与扩大管的小端等径的喉管及与喉管连通的吸入室,所述的吸入室底部中心位置设有喷嘴。本发明利用液体出提液器的喷嘴时产生的高速度,在吸入室位于喷嘴周边处产生低压,回流液体与被抽吸液体一起混合后进入离心泵,形成正压进液,不再受泵吸系统吸上高度与液体中含有挥发物造成的泵吸条件限制。(The invention relates to a centrifugal pump system with a liquid extractor and a working method thereof, wherein the centrifugal pump system comprises a centrifugal pump, a suction pipeline and an output pipeline, and is characterized in that: the centrifugal pump system is equipped with the liquid extractor, the suction pipeline with set up in the export intercommunication of the liquid extractor of pond bottom, the centrifugal pump exit still is equipped with the backflow pipeline of being connected through tee bend and delivery line, the liquid extractor from last to down in order including the pipe diameter big-end-up and with the enlarged pipe of suction pipeline intercommunication, with the tip isodiametric choke of enlarged pipe and with the suction chamber of choke intercommunication, suction chamber bottom central point put and be equipped with the nozzle. The invention utilizes the high speed generated when the liquid is discharged from the nozzle of the liquid extractor to generate low pressure at the periphery of the nozzle in the suction chamber, and the backflow liquid and the pumped liquid are mixed together and then enter the centrifugal pump to form positive pressure liquid inlet, which is not limited by the suction height of a pumping system and pumping conditions caused by volatile matters contained in the liquid.)

1. The utility model provides a centrifugal pump system with liquid elevator, includes the centrifugal pump that is located the ground level, stretches into the liquid level down with the suction pipeline of centrifugal pump intercommunication and with the output pipeline of centrifugal pump export intercommunication, its characterized in that: the centrifugal pump system is provided with a liquid extractor, the suction pipeline is communicated with an outlet of the liquid extractor arranged at the bottom of the water pool, a return pipeline connected with an output pipeline through a tee joint is further arranged at the outlet of the centrifugal pump, a first stop valve is arranged between the output pipeline and the tee joint, a second stop valve is arranged between the return pipeline and the tee joint, the liquid extractor sequentially comprises an expansion pipe communicated with the suction pipeline and an inhalation chamber communicated with the expansion pipe from top to bottom, the throat pipe is equal in diameter to the small end of the expansion pipe, and a nozzle is arranged at the center of the bottom of the inhalation chamber.

2. The centrifugal pump system with an extractor as recited in claim 1, wherein: the suction pipeline and the outlet communicating pipeline of the liquid extractor arranged at the bottom of the water pool are provided with check valves, the outlet of the centrifugal pump and the tee joint are also provided with a water injection pipeline which is used for injecting water into the centrifugal pump during initial work and is provided with a third stop valve.

3. The centrifugal pump system with an extractor as recited in claim 1, wherein: the nozzle opening of the nozzle is positioned in the suction chamber, the caliber of the nozzle is smaller than the pipe diameter of the throat pipe, the outer wall of the nozzle is fixedly connected with the bottom of the suction chamber through a plurality of uniformly distributed support plates, a gap is reserved between every two adjacent support plates, and the three support plates are arranged in a Y shape.

4. The centrifugal pump system with an extractor as recited in claim 1, wherein: the liquid lifting device pass through the firm arrangement in the pond bottom of supporting leg, the supporting leg locate the suction chamber outer wall of liquid lifting device, adopt steel pipe or angle steel to make, be the setting of Y font equipartition, the suction chamber bottom of liquid lifting device is 100 +/-10 cm apart from the pond liquid level.

5. A method of operating a centrifugal pump system with an extractor according to any of claims 1 to 4, characterized in that: before the centrifugal pump is started for the first work, the third stop valve is opened, water is filled into the pump through the water injection pipeline, air in the pump is discharged, then the pump is started, at the moment, the first stop valve on the output pipeline is in an opening state, the second stop valve on the backflow pipeline is in a closing state, the suction pipeline is provided with a check valve, so that the water in the injection pump cannot flow back into the water pool, after the water injection work is finished, the third stop valve on the water injection pipeline is closed, the second stop valve 11 on the backflow pipeline is opened, the first stop valve on the output pipeline is closed at the same time, the centrifugal pump is started again, at the moment, the liquid at the outlet of the centrifugal pump is in a full backflow state, the pumped liquid continuously enters the suction chamber of the liquid lifter through the backflow pipeline and is mixed with the liquid directly pumped from the water pool through the centrifugal pump, when the suction pipeline makes an air hammer sound, the first stop valve on, the air in the suction pipeline is conveyed to the output pipeline to be discharged when the system starts, when the air in the suction pipeline is completely exhausted after working, the output pipeline starts to output liquid, the pumping system starts to enter a normal operation condition, and then only a small amount of backflow liquid is needed for the liquid extractor to work.

6. The method of operating a centrifugal pump system with an extractor as recited in claim 5, further comprising: under the condition that the centrifugal pump system is only stopped and is not disassembled, assembled and moved, water does not need to be injected into the centrifugal pump when the centrifugal pump system is used again.

7. The method of operating a centrifugal pump system with an extractor as recited in claim 5, further comprising: the centrifugal pump system correspondingly changes the flow ratio between the output pipeline and the return pipeline through the ratio change between the caliber of the nozzle and the pipe diameter of the throat pipe, ensures the return flow for the liquid extractor to work by adjusting the first stop valve and the second stop valve, and further improves the working efficiency of the pumping system by adjusting the relationship among the outlet pressure, the suction pressure and the nozzle working pressure of the centrifugal pump.

Technical Field

The invention relates to a pumping device, in particular to a centrifugal pump system with a liquid extractor and a working method thereof.

Background

The suction height of the pumping system is limited by the structure of the centrifugal pump, namely, the height H of the liquid level sucked from the center point of the pump body to the water pool in the attached figure 1 is limited, the maximum value is usually 5-6 meters, and meanwhile, the following conditions are combined:

1. the difference that the local atmospheric pressure is lower than the absolute pressure of 0.1MPa needs to be subtracted;

2. the difference between the saturated vapor pressure of the pumped liquid at the working temperature and the saturated vapor pressure of water at 20 ℃ needs to be deducted;

3. the effect of the volatile gas contained in the pumped liquid on the suction height.

The three conditions can greatly reduce the original suction height of the pump, and particularly when the pumped liquid contains volatile gas, once the negative pressure is formed at the pump inlet, the gas mixed in the original liquid can be greatly escaped in a short time, so that the negative pressure at the pump inlet is reduced, the suction height of the pump is reduced until the suction height is zero, and the centrifugal pump can not work effectively.

In conditions where a pumping system is used, the following situations are often encountered: the temperature of the pumped liquid is very close to the boiling point (namely the pumped liquid is very easy to vaporize); in the environmental water treatment, the liquid level of the industrial wastewater to be sucked is almost below the water level, and the industrial wastewater usually contains volatile gases (i.e., organic substances with low boiling point, gases with low solubility in water, such as ammonia, nitrogen, carbon dioxide, etc.); in the biochemical treatment work, a large amount of air is introduced into the sewage due to the culture of aerobic bacteria. The above situations will cause the performance of the centrifugal pump to be reduced until the centrifugal pump cannot work, and the pumping system is low in efficiency, even the pumping work cannot be completed.

Disclosure of Invention

The invention aims to solve the technical limitation of the prior pump and designs a centrifugal pump system with a liquid lifter and a working method thereof.

The invention is realized by the following steps: a centrifugal pump system with a liquid lifter and a working method thereof, the centrifugal pump system with the liquid lifter comprises a centrifugal pump positioned on the ground level, a suction pipeline extending into the liquid level and communicated with the centrifugal pump, and an output pipeline communicated with an outlet of the centrifugal pump, and is characterized in that: the centrifugal pump system is provided with a liquid extractor, the suction pipeline is communicated with an outlet of the liquid extractor arranged at the bottom of the water pool, a return pipeline connected with an output pipeline through a tee joint is further arranged at the outlet of the centrifugal pump, a first stop valve is arranged between the output pipeline and the tee joint, a second stop valve is arranged between the return pipeline and the tee joint, the liquid extractor sequentially comprises an expansion pipe communicated with the suction pipeline and an inhalation chamber communicated with the expansion pipe from top to bottom, the throat pipe is equal in diameter to the small end of the expansion pipe, and a nozzle is arranged at the center of the bottom of the inhalation chamber. The suction pipeline and the outlet communicating pipeline of the liquid extractor arranged at the bottom of the water pool are provided with check valves, the outlet of the centrifugal pump and the tee joint are also provided with a water injection pipeline which is used for injecting water into the centrifugal pump during initial work and is provided with a third stop valve. The nozzle opening of the nozzle is positioned in the suction chamber, the caliber of the nozzle is smaller than the pipe diameter of the throat pipe, the outer wall of the nozzle is fixedly connected with the bottom of the suction chamber through a plurality of uniformly distributed support plates, a gap is reserved between every two adjacent support plates, and the three support plates are arranged in a Y shape. The liquid lifting device pass through the firm arrangement in the pond bottom of supporting leg, the supporting leg locate the suction chamber outer wall of liquid lifting device, adopt steel pipe or angle steel to make, be the setting of Y font equipartition, the suction chamber bottom of liquid lifting device is 100 +/-10 cm apart from the pond liquid level.

The working method of the centrifugal pump system with the liquid extractor is as follows:

before the centrifugal pump is started for the first work, the third stop valve is opened, full water is filled into the pump through the water injection pipeline, air in the pump is discharged, then the pump is started again, at the moment, the first stop valve on the output pipeline is in an open state, the second stop valve on the backflow pipeline is in a closed state, the suction pipeline is provided with a check valve, so that water in the injection pump cannot flow back into the water pool, after the water injection work is finished, the third stop valve on the water injection pipeline is closed, the second stop valve 11 on the backflow pipeline is opened, the first stop valve on the output pipeline is closed at the same time, the centrifugal pump is started again, at the moment, liquid at the outlet of the centrifugal pump is in a full backflow state, the pumped liquid continuously enters the suction chamber of the liquid lifter through the backflow pipeline and is mixed with the liquid directly pumped by the centrifugal pump in the water pool, and when the suction pipeline makes an air hammer sound, the first stop valve on, the air in the suction pipeline is conveyed to the output pipeline to be discharged when the system starts, when the air in the suction pipeline is completely exhausted after working, the output pipeline starts to output liquid, the pumping system starts to enter a normal operation condition, and then only a small amount of backflow liquid is needed for the liquid extractor to work.

Under the condition that the centrifugal pump system is only stopped and is not disassembled, assembled and moved, water does not need to be injected into the centrifugal pump when the centrifugal pump system is used again.

The centrifugal pump system can correspondingly change the flow ratio between the output pipeline and the return pipeline through the ratio change between the caliber of the nozzle and the pipe diameter of the throat pipe, ensure the return flow for the liquid extractor to work by adjusting the first stop valve and the second stop valve, and further improve the working efficiency of the pumping system by adjusting the relationship among the outlet pressure, the suction pressure and the nozzle working pressure of the centrifugal pump.

The invention has the beneficial effects that: the invention conveys part of liquid in the pumped liquid at the outlet of the centrifugal pump to the inlet of the liquid extractor arranged below the liquid level, and utilizes the high speed generated when the liquid is discharged from the nozzle of the liquid extractor to generate low pressure at the periphery of the nozzle in the suction chamber, and the low pressure and the pumped liquid pumped from a water pool in the suction chamber are mixed and then enter the inlet of the centrifugal pump. Positive pressure liquid inlet is formed at the inlet of the centrifugal pump instead of negative pressure liquid inlet formed by directly pumping from a water pool in the prior art. Therefore, pumping limitations caused by the vacuum level of the pumping system in the prior art do not exist, and the product of the invention is not limited by the pumping conditions caused by the suction level of the pumping system and the volatile matters contained in the liquid.

Drawings

FIG. 1 is a diagrammatic illustration of the operation of a prior art pumping system.

Figure 2 is a diagrammatic illustration of the operation of the pumping system of the present invention.

Figure 3 is a schematic illustration of the configuration of an extractor in a pumping system according to the present invention.

In the figure: 1. a centrifugal pump; 2. A ground plane; 3. A liquid level; 4. A liquid extractor; 5. A suction duct; 6. A check valve; 7. An output pipe; 8. A return line; 9. A water injection pipeline; 10. A first shut-off valve; 11. A second stop valve; 12. A third stop valve; 13. Supporting legs; 41. Enlarging the tube; 42. A throat; 43. A suction chamber; 44. A nozzle; 45. And a support plate.

Detailed Description

The invention is further described with reference to the following figures and specific examples.

According to the attached figure 2, the invention relates to a centrifugal pump system with a liquid lifter and a working method thereof, the centrifugal pump system with the liquid lifter comprises a centrifugal pump 1 positioned on a ground level 2, a suction pipeline 5 extending into the position below a liquid level 3 and communicated with the centrifugal pump 1, and an output pipeline 7 communicated with an outlet of the centrifugal pump 1, wherein the suction pipeline 5 is communicated with an outlet of the liquid lifter 4 arranged at the bottom of a water pool, a check valve 6 is arranged on the centrifugal pump, a return pipeline 8 connected with an output pipeline 7 through a tee joint is also arranged at the outlet of the centrifugal pump 1, a first stop valve 10 is arranged between the output pipeline 7 and the tee joint, a second stop valve 11 is arranged between the return pipeline 8 and the tee joint, a water injection pipeline 9 with a third stop valve 12 is also arranged between the outlet of the centrifugal pump 1 and the tee joint and is used for injecting water when the centrifugal pump 1 works initially. The liquid lifter 4 is stably arranged at the bottom of the water pool through the supporting legs 13.

According to the attached figure 3, the liquid lifter 4 comprises an expansion pipe 41 with a large pipe diameter and a small pipe diameter from top to bottom and communicated with the suction pipeline 5, a throat pipe 42 with a diameter equal to that of the small end of the expansion pipe 41 and a suction chamber 43 communicated with the throat pipe 42, a nozzle 44 is arranged at the center of the bottom of the suction chamber 43, the outer wall of the nozzle 44 is fixedly connected with the bottom of the suction chamber 43 through a plurality of uniformly distributed support plates 45, and a gap is reserved between every two adjacent support plates. In order to maintain the stability of the operation state of the pumping system, the supporting plate 45 is preferably provided in three pieces in a Y-shaped arrangement. The nozzle opening of the nozzle 44 is located in the suction chamber, and the caliber of the nozzle 44 is smaller than the pipe diameter of the throat 42, so that the flow ratio between the output pipeline 7 and the return pipeline 8 can be changed correspondingly through the change of the ratio between the caliber of the nozzle 44 and the pipe diameter of the throat 42. The supporting legs 13 are arranged on the outer wall of the suction chamber of the liquid lifter 4, and in order to keep the working state stability of the pumping system, 3 supporting legs 13 are preferably arranged and uniformly distributed in a Y shape, and the distance from the bottom of the suction chamber 43 of the liquid lifter 4 to the liquid level of the water pool is 100 +/-10 cm. The supporting legs 13 can be made of steel pipes or angle steels and the like.

The working method of the invention is as follows:

in order to discharge the air in the suction pipeline 5, before the centrifugal pump 1 works and starts for the first time, the third stop valve 12 is opened, water is filled into the pump through the water injection pipeline 9, so that the pump is filled with working liquid instead of air, and then the pump is started. At this time, the first stop valve 10 of the output pipe 7 is opened, the second stop valve 11 of the return pipe 8 is closed, and the check valve 6 is provided in the suction pipe 5, so that the water injected into the pump does not flow back into the water reservoir.

After the water injection work is finished, closing a third stop valve 12 on a water injection pipeline 9, opening a second stop valve 11 on a return pipeline 8, closing a first stop valve 10 on an output pipeline 7 at the same time, starting the centrifugal pump 1, wherein the liquid at the outlet of the centrifugal pump 1 is in a full return state, the pumped liquid continuously enters a suction chamber of the liquid lifter 4 through the return pipeline 8 and is mixed with the liquid directly pumped by the centrifugal pump 1 in the water pool, when the suction pipeline 5 makes an air hammer sound, the first stop valve 10 on the output pipeline 7 is opened slowly, the pump starts to send the liquid mixed with air in the suction pipeline 5 to the output pipeline 7 for discharging, meanwhile, part of the liquid output by the pump returns to the liquid lifter 4 through the pipeline until the air in the suction pipeline 5 is completely discharged, the output pipeline 7 starts to output the liquid, and the pumping system starts to enter a normal operation condition, the adjustment of the first stop valve 10 and the second stop valve 11 ensures that the return flow is supplied to the operation of the liquid elevator 4, and so on. After the pumping system stops working, if the pumping system is not detached and moved, water does not need to be injected into the centrifugal pump when the pumping system is used again.

Since the liquid output by the centrifugal pump is partially recycled by the system, the flow demand of the centrifugal pump is larger than that of the centrifugal pump without using a liquid extractor in the prior art, and the flow demand depends on the distance between the liquid level and the center of the pump shaft, namely the height H between the center of the pump shaft and the liquid level on the attached drawing.