CN215566918U - Cavitation-resistant device for large centrifugal water pump - Google Patents
Cavitation-resistant device for large centrifugal water pump Download PDFInfo
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- CN215566918U CN215566918U CN202121269458.9U CN202121269458U CN215566918U CN 215566918 U CN215566918 U CN 215566918U CN 202121269458 U CN202121269458 U CN 202121269458U CN 215566918 U CN215566918 U CN 215566918U
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Abstract
The utility model discloses an anti-cavitation device of a large centrifugal water pump, which comprises a centrifugal water pump, a water storage device, an ejector, an outlet branch pipe and an exhaust pipe, wherein the centrifugal water pump is connected with the water storage device; the centrifugal water pump comprises an inlet end and an outlet end, wherein the inlet end is provided with a pump inlet valve, and the outlet end is provided with an outlet flow regulating valve; the water storage device is connected with the centrifugal water pump through a pump inlet valve; the ejector is arranged above the centrifugal water pump in parallel, and the outlet of the ejector is connected with the water storage device; the outlet branch pipe is arranged above the outlet end of the centrifugal water pump, one end of the outlet branch pipe is connected with the outlet end of the centrifugal water pump, the other end of the outlet branch pipe is connected with the inlet of the ejector, and the outlet branch pipe is provided with a power valve; the blast pipe sets up at centrifugal water pump's top, and blast pipe one end is connected with centrifugal water pump's top, and the blast pipe other end is connected with the side of sprayer, sets up the air discharge valve on the blast pipe. The centrifugal water pump is simple in structure and convenient to use, the ejector is arranged, the exhaust effect of the centrifugal water pump is improved, non-condensable gas generated in the operation process of the centrifugal water pump is effectively removed, the phenomenon that cavitation erosion is generated due to accumulation of the non-condensable gas is prevented, the damage probability of the centrifugal water pump is reduced, and the service life of the centrifugal water pump is greatly prolonged.
Description
Technical Field
The utility model belongs to the field of process machinery, and particularly relates to an anti-cavitation device for a large centrifugal water pump.
Background
The petrochemical industry generally uses large-scale centrifugal water pump, especially in circulative cooling system, and the condition that large-scale centrifugal water pump generally has the cavitation erosion allowance not enough in the design and the installation's of process. In the using process, because the effective static pressure of the liquid level of the water tank and the pump top is small, air is not easy to exhaust, and the flow of the centrifugal water pump is large, a vortex is easily formed at a pump suction inlet, so that air enters the pump body. The pump body vibrates greatly and is easy to generate cavitation due to the existence of medium vaporization and non-condensable gas, the long-term existence of the condition can reduce the pumping quantity of the centrifugal water pump and damage the pump body and the impeller, thereby greatly reducing the service efficiency and the service life of the centrifugal water pump.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an anti-cavitation device for a large centrifugal water pump, which is simple in structure and convenient to use, is provided with an ejector, an exhaust pipe and an outlet branch pipe, and improves the exhaust effect of the centrifugal water pump by utilizing the negative pressure effect of the ejector.
In order to achieve the purpose, the technical scheme of the utility model is as follows: provided is a cavitation erosion prevention device for a large centrifugal water pump, including:
a centrifugal water pump; the centrifugal water pump comprises an inlet end and an outlet end, wherein the inlet end is provided with a pump inlet valve, and the outlet end is provided with an outlet flow regulating valve;
a water storage device; the water storage device is connected with the centrifugal water pump through the pump inlet valve;
an ejector; the ejector is arranged above the centrifugal water pump in parallel, so that the resistance of a rear pipe section of the ejector is reduced, the power water efficiency is improved, and an outlet of the ejector is connected with the water storage device;
an outlet branch pipe; the outlet branch pipe is arranged above the outlet end of the centrifugal water pump, one end of the outlet branch pipe is connected with the outlet end of the centrifugal water pump, the other end of the outlet branch pipe is connected with the inlet of the ejector, and the outlet branch pipe is provided with a power valve;
an exhaust pipe; the exhaust pipe is arranged at the top of the centrifugal water pump, one end of the exhaust pipe is connected with the top of the centrifugal water pump, the other end of the exhaust pipe is connected with the side face of the ejector, and an exhaust valve is arranged on the exhaust pipe.
Further, based on the requirements of pumping and steam removal, the diameter of the outlet branch pipe is greater than or equal to 12.5mm and less than or equal to 25 mm.
Further, the power valve is a ball valve.
Furthermore, the exhaust pipe is connected with the connection part of the ejector in an included angle mode.
Furthermore, the connection included angle between the exhaust pipe and the ejector is larger than 30 degrees and smaller than 60 degrees, so that the resistance of the pumped medium is favorably reduced.
Further, as the pump gas and steam are accumulated at the top of the centrifugal water pump, the diameter of the exhaust pipe is 1/2 of the diameter of the outlet pipeline of the centrifugal water pump, and the pump gas and steam are favorably discharged.
Further, the exhaust valve is a ball valve.
Furthermore, the exhaust pipe section between the exhaust valve and the ejector is made of carbon steel, and stainless steel is not suitable for being used due to the fact that the pumped medium contains chlorine ions.
Furthermore, the outlet branch pipe section between the power valve and the ejector is made of carbon steel, and stainless steel is not suitable for being used due to the fact that the pumped medium contains chloride ions.
Furthermore, the vertical height of the ejector from the centrifugal water pump is not more than two meters, so that the air in the pump body can be pumped out quickly.
Furthermore, the vacuum formed by the nozzle in the ejector is less than or equal to 0.073MPa, and the air extraction amount is required to meet the requirement of 18m3/h。
Compared with the prior art, the cavitation erosion prevention device for the large centrifugal water pump has the beneficial effects that:
(1) the centrifugal water pump is simple in structure and convenient to use, the ejector is arranged, the exhaust effect of the centrifugal water pump is improved, non-condensable gas generated in the operation process of the centrifugal water pump is effectively removed, the phenomenon that cavitation erosion is generated due to accumulation of the non-condensable gas is prevented, the damage probability of the centrifugal water pump is reduced, and the service life of the centrifugal water pump is greatly prolonged.
(2) The utility model has convenient operation and low requirement on the operating skill of operators; can fundamentally solve the cavitation problem of the centrifugal pump.
(3) The centrifugal water pump can be transformed by utilizing the original exhaust pipeline without transforming the centrifugal water pump, can be widely applied to various centrifugal water pumps, and has wider application range.
Drawings
FIG. 1 is a schematic structural diagram of an anti-cavitation device of a large centrifugal water pump according to the present invention;
in the figure: 1. a pump inlet valve; 2. a centrifugal water pump; 3. an outlet flow regulating valve; 4. a power valve; 5. an exhaust valve; 6. a flange; 7. an ejector; 8. a water storage device; 9. an outlet branch pipe; 10. an exhaust pipe; 11. an outlet line.
Detailed Description
The following is a detailed description of the embodiments of the present invention, which is implemented on the premise of the technical solution of the present invention, and the detailed implementation and specific operation procedures are given, but the protection scope of the present invention is not limited to the following embodiments.
As shown in figure 1, the anti-cavitation device for the large centrifugal water pump comprises a pump inlet valve 1, a centrifugal water pump 2, an outlet flow regulating valve 3, a power valve 4, an exhaust valve 5, a flange 6, an ejector 7, a water storage device 8, an outlet branch pipe 9, an exhaust pipe 10 and an outlet pipeline 11.
The water storage device 8 is connected with the pump inlet valve 1 through an inlet pipeline, and the pump inlet valve 1 is connected with the centrifugal water pump 2 through a pipeline. An outlet branch pipe 4 is arranged on a pipeline between the centrifugal water pump 2 and the outlet flow regulating valve 3, and the outlet branch pipe 4 is connected with the inlet end of an ejector 7 through a flange 6 by a power valve 4. The side surface of the ejector 7 is connected with the exhaust pipe 10 and the exhaust valve 5 through the flange 6 and the centrifugal water pump 2. The ejector 7 is connected via a flange 6 to an outlet line 11, which outlet line 11 leads into a water storage device 8.
The jet flow speed of the ejector 7 is about 15 m/s.
The working principle of the anti-cavitation device of the large centrifugal water pump is as follows:
water in a water storage device 8 enters a centrifugal water pump 2 through an inlet pipeline and a pump inlet valve 1, the water enters a user through an outlet flow regulating valve 3 after being pressurized by the centrifugal water pump 2, an outlet branch pipe 9 is installed at the top of the outlet pipeline of the centrifugal water pump 2, partial water enters a small-sized ejector 7 through the outlet branch pipe 9 and a power valve 4 by utilizing power water generated by the centrifugal water pump, the water enters the ejector 7 and is ejected through a nozzle, pressure energy is converted into velocity energy due to extremely high flow velocity of ejected water, the pressure in an air suction area is reduced to generate vacuum, and non-condensable gas in the centrifugal water pump 2 is pumped away through an exhaust pipe 10 and an exhaust valve 5 and is discharged into the water storage device 8 along with the water.
In the process of putting the device into use, the power valve 4 is firstly opened, and the exhaust valve 5 is opened after the power valve 4 is opened to a certain opening degree, so that the operation effect of the device can be ensured.
During the use of the device, the exhaust valve 5 is in a full-open position at any time, and the power valve 4 adjusts the flow of power water according to the use effect.
The installation positions of the power valve 4 and the exhaust valve 5 are not too high and are not more than two meters, so that the operation of personnel is convenient.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.
Claims (10)
1. The utility model provides a large-scale centrifugal water pump anti-cavitation device which characterized in that includes:
a centrifugal water pump; the centrifugal water pump comprises an inlet end and an outlet end, wherein the inlet end is provided with a pump inlet valve, and the outlet end is provided with an outlet flow regulating valve;
a water storage device; the water storage device is connected with the centrifugal water pump through the pump inlet valve;
an ejector; the ejector is arranged above the centrifugal water pump in parallel, and an outlet of the ejector is connected with the water storage device;
an outlet branch pipe; the outlet branch pipe is arranged above the outlet end of the centrifugal water pump, one end of the outlet branch pipe is connected with the outlet end of the centrifugal water pump, the other end of the outlet branch pipe is connected with the inlet of the ejector, and the outlet branch pipe is provided with a power valve;
an exhaust pipe; the exhaust pipe is arranged at the top of the centrifugal water pump, one end of the exhaust pipe is connected with the top of the centrifugal water pump, the other end of the exhaust pipe is connected with the side face of the ejector, and an exhaust valve is arranged on the exhaust pipe.
2. The large centrifugal water pump cavitation erosion prevention device according to claim 1, characterized in that: the diameter of the outlet branch pipe is more than or equal to 12.5mm and less than or equal to 25 mm.
3. The large centrifugal water pump cavitation erosion prevention device according to claim 1, characterized in that: the power valve is a ball valve.
4. The large centrifugal water pump cavitation erosion prevention device according to claim 1, characterized in that: the exhaust pipe is connected with the joint of the ejector in an included angle mode.
5. The large centrifugal water pump cavitation erosion prevention device according to claim 4, characterized in that: the exhaust pipe and the ejector are connected at an included angle larger than 30 degrees and smaller than 60 degrees.
6. The large centrifugal water pump cavitation erosion prevention device according to claim 1, characterized in that: the diameter of the exhaust pipe is 1/2 of the diameter of the outlet pipeline of the centrifugal water pump.
7. The large centrifugal water pump cavitation erosion prevention device according to claim 1, characterized in that: the exhaust valve is a ball valve.
8. The large centrifugal water pump cavitation erosion prevention device according to claim 1, characterized in that: and an exhaust pipe section between the exhaust valve and the ejector is made of carbon steel.
9. The large centrifugal water pump cavitation erosion prevention device according to claim 1, characterized in that: and an outlet branch pipe section between the power valve and the ejector is made of carbon steel.
10. The large centrifugal water pump cavitation erosion prevention device according to any one of claims 1 to 9, characterized in that: the vertical height of the ejector from the centrifugal water pump is not more than two meters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121269458.9U CN215566918U (en) | 2021-06-08 | 2021-06-08 | Cavitation-resistant device for large centrifugal water pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121269458.9U CN215566918U (en) | 2021-06-08 | 2021-06-08 | Cavitation-resistant device for large centrifugal water pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215566918U true CN215566918U (en) | 2022-01-18 |
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ID=79866792
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121269458.9U Active CN215566918U (en) | 2021-06-08 | 2021-06-08 | Cavitation-resistant device for large centrifugal water pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215566918U (en) |
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2021
- 2021-06-08 CN CN202121269458.9U patent/CN215566918U/en active Active
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