CN212225603U - Flow guider for centrifugal pump - Google Patents
Flow guider for centrifugal pump Download PDFInfo
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- CN212225603U CN212225603U CN202020730025.8U CN202020730025U CN212225603U CN 212225603 U CN212225603 U CN 212225603U CN 202020730025 U CN202020730025 U CN 202020730025U CN 212225603 U CN212225603 U CN 212225603U
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- centrifugal pump
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Abstract
The utility model discloses a fluid director which can be used for a centrifugal pump, the fluid director is fixedly connected in the inner cavity of the centrifugal pump, and an upper water suction chamber and a pumping chamber of the centrifugal pump are separated by the fluid director; the flow guide device is characterized in that the flow guide device is provided with a plurality of flow passages, two ends of each flow passage are respectively communicated with the upper water suction chamber and the water pressing chamber, the cross sectional area of each flow passage from one side of the upper water suction chamber to one side of the water pressing chamber is gradually increased, and the flow passages are internally provided with guide vanes. A divertor that can be used to centrifugal pump, can reduce the velocity of flow of liquid, improve the pressure of liquid to reduce the impact to centrifugal pump impeller, improve the efficiency of centrifugal pump.
Description
Technical Field
The utility model relates to a divertor especially relates to a divertor that can be used to centrifugal pump.
Background
When the centrifugal pump runs, fluid at the inlet of the impeller has high speed and low pressure, and can be vaporized to generate bubbles. When the bubbles move to a high-pressure area along with the main flow, the bubbles collapse, and the shock waves generated when the bubbles collapse instantly form an impact action on the overflowing wall surface, so that the overflowing wall surface is damaged by repeated impact. When the quantity of bubbles is large, the flowing state of liquid in the centrifugal pump is influenced, the work-doing capability of the centrifugal pump is reduced, the operation is unstable, and even the whole centrifugal pump unit generates vibration. Therefore, it is very important to improve the cavitation resistance of the centrifugal pump.
At present, the means for improving the cavitation resistance of the centrifugal pump mainly comprise the following steps: (1) and optimizing geometric parameters of the impeller. For example, the diameter of the inlet of the impeller is increased, the width of the inlet edge of the blade is increased, the curvature radius of the inlet part of a front cover plate of the impeller is changed, the thickness of the inlet edge of the blade is reduced, and the like; (2) an inducer is additionally arranged on the upstream of the impeller. An inducer is arranged at the upstream of the impeller of the centrifugal pump, and can pressurize fluid flowing into the impeller, so that the cavitation resistance of the centrifugal pump is improved. The arrangement of the inducer increases the axial length of the pump, needs the input of shaft power, and can cause the pump efficiency to be obviously reduced when the pump operates under a partial working condition; (3) the impeller is made of anti-cavitation materials, such as hard tool steel, tungsten carbide and the like; or the surface of the flow-through part of the pump is treated, such as by spraying a cavitation-resistant metallic material or a non-metallic coating. These methods help protect the impeller, but increase the manufacturing cost of the impeller.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects existing in the prior art, the utility model provides a fluid director which can be used for a centrifugal pump so as to improve the anti-cavitation capacity of the centrifugal pump.
The technical scheme is as follows: in order to achieve the purpose, the fluid director for the centrifugal pump is fixedly connected in an inner cavity of the centrifugal pump, and an upper water suction chamber and a pumping chamber of the centrifugal pump are separated by the fluid director; the fluid director is provided with a plurality of flow passages, two ends of each flow passage are respectively communicated with the upper water suction chamber and the water pumping chamber, and the cross sectional area of each flow passage from one side of the upper water suction chamber to one side of the water pumping chamber is gradually increased.
Further, the fluid director comprises a central column and an outer cylinder, the outer cylinder is coaxially sleeved outside the central column, and a flow channel is formed between the outer wall of the central column and the inner wall of the outer cylinder.
Furthermore, a plurality of guide vanes are arranged in the flow channel at intervals along the circumferential direction, and two sides of each guide vane are respectively connected with the outer wall of the central column and the inner wall of the outer cylinder.
Further, the number of impeller blades of the centrifugal pump is N, the number of guide vanes is N +1, wherein N is any positive integer.
Further, the inclination angle of the guide vane is the same as the inlet liquid flow angle of the impeller blade of the centrifugal pump.
Further, the side wall of the flow channel is arc-shaped.
Furthermore, the included angle between the connecting line of the upper end point and the lower end point on the same bus of the side wall of the flow channel and the axis of the flow channel is 10-15 degrees.
Furthermore, the outer wall of the fluid director is provided with a circle of bulges for fixing with the centrifugal pump.
Has the advantages that: the utility model discloses a can be used to divertor of centrifugal pump: (1) when fluid passes through the flow channel of the fluid director, the sectional area of the flow channel is gradually increased, the speed of the fluid is gradually reduced, and the pressure is gradually increased, so that the cavitation resistance of the centrifugal pump is improved; (2) when the fluid passes through the fluid director, the guide vanes do work on the fluid to pre-rotate the fluid, so that the impact loss of the fluid is reduced; (3) the fluid director is fixed on the pump body, and the energy consumption is reduced without the driving of a shaft.
Drawings
FIG. 1 is a two-dimensional cross-sectional view of the present invention;
fig. 2 is a schematic structural diagram of the installation of the fluid director and the centrifugal pump of the present invention.
Detailed Description
The present invention will be further described with reference to fig. 1 to 2.
The fluid director can be used for a centrifugal pump, the fluid director 1 is fixedly connected in an inner cavity of the centrifugal pump 2, specifically, a circle of bulges 9 are arranged on the outer side of the fluid director 1, and the fluid director 1 is fixedly clamped with the centrifugal pump 2 through the bulges 9. The centrifugal pump 2 is generally internally provided with a plurality of cavities, which are an upper water suction chamber 3 and a pressure chamber from top to bottom in sequenceA water chamber 4 and a lower water absorption chamber 10. The fluid director 1 is arranged between the upper water suction chamber 3 and the water pumping chamber 4, a plurality of flow passages 5 are arranged on the fluid director 1, two ends of each flow passage 5 are respectively communicated with the upper water suction chamber 3 and the water pumping chamber 4, and the cross-sectional area of each flow passage 5 from one side of the upper water suction chamber 3 to one side of the water pumping chamber 4 is gradually increased. According to the continuity equation of the one-dimensional incompressible fluid: v1A1＝V2A2When fluid passes through the fluid director, the sectional area of the flow channel is increased, the average flow velocity of the section of the flow channel is reduced, and the reduced fluid kinetic energy is converted into the pressure energy of the fluid, so that the pressure of the fluid is increased, and the cavitation resistance of the pump is improved.
Specifically, the deflector 1 is composed of a center post 6 and an outer cylinder 7. The outer cylinder 7 is coaxially sleeved outside the central column 6, and a flow channel 5 is formed between the outer wall of the central column 6 and the inner wall of the outer cylinder 7. A plurality of guide vanes 8 are arranged in the flow channel 5, the guide vanes 8 are arranged at intervals along the circumferential direction, and two sides of each guide vane 8 are respectively connected with the outer wall of the central column 6 and the inner wall of the outer cylinder 7. The guide vanes are arranged in the fluid director, so that the impact loss of fluid entering the impeller can be reduced. The outer wall of the central column 6 and the inner wall of the outer cylinder 7 are both arc-shaped, and an included angle A between a connecting line of an upper end point and a lower end point on the same bus on the side wall of the runner 5 and the axis of the runner 5 is 10-15 degrees. At the same time, the number of guide vanes 8 should be one more than the number of impeller vanes of the centrifugal pump 2 in order to prevent static interference. The guide vane is in a near spiral shape, the inclination angle of the guide vane 8 is the same as the inlet liquid flow angle of the impeller blade of the centrifugal pump 2, so that the fluid can be pre-rotated, and the impact loss is reduced.
The above description is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.
Claims (8)
1. A kind of deflector that can be used for centrifugal pump, characterized by: the fluid director (1) is fixedly connected in the inner cavity of the centrifugal pump (2), and an upper water suction chamber (3) and a water pumping chamber (4) of the centrifugal pump (2) are separated by the fluid director (1); the flow guider (1) is provided with a plurality of flow channels (5), two ends of each flow channel (5) are respectively communicated with the upper water suction chamber (3) and the water pumping chamber (4), and the cross sectional area of each flow channel (5) is gradually increased from one side of the upper water suction chamber (3) to one side of the water pumping chamber (4).
2. A flow inducer usable with a centrifugal pump according to claim 1, characterized in that: the flow guider (1) comprises a central column (6) and an outer cylinder (7), the outer cylinder (7) is coaxially sleeved outside the central column (6), and a flow channel (5) is formed between the outer wall of the central column (6) and the inner wall of the outer cylinder (7).
3. A flow inducer usable in a centrifugal pump according to claim 2, characterized in that: a plurality of guide vanes (8) are arranged in the flow channel (5), the guide vanes (8) are arranged at intervals along the circumferential direction, and two sides of each guide vane (8) are respectively connected with the outer wall of the central column (6) and the inner wall of the outer cylinder (7).
4. A flow inducer usable with a centrifugal pump according to claim 3, characterized in that: the number of impeller blades of the centrifugal pump (2) is N, the number of guide vanes (8) is N +1, and N is any positive integer.
5. A flow inducer usable with a centrifugal pump according to claim 3, characterized in that: the inclination angle of the guide vane (8) is the same as the inlet liquid flow angle of the impeller vane of the centrifugal pump (2).
6. A flow inducer usable with a centrifugal pump according to claim 1, characterized in that: the side wall of the flow channel (5) is arc-shaped.
7. A flow inducer usable with a centrifugal pump according to claim 6, characterized in that: and the included angle between the connecting line of the upper end point and the lower end point on the same bus on the side wall of the flow channel (5) and the axis of the flow channel (5) is 10-15 degrees.
8. A flow inducer usable with a centrifugal pump according to claim 1, characterized in that: the outer wall of the fluid director (1) is provided with a circle of bulges (9) which are used for fixing with the centrifugal pump (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020730025.8U CN212225603U (en) | 2020-05-07 | 2020-05-07 | Flow guider for centrifugal pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020730025.8U CN212225603U (en) | 2020-05-07 | 2020-05-07 | Flow guider for centrifugal pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212225603U true CN212225603U (en) | 2020-12-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020730025.8U Active CN212225603U (en) | 2020-05-07 | 2020-05-07 | Flow guider for centrifugal pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212225603U (en) |
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2020
- 2020-05-07 CN CN202020730025.8U patent/CN212225603U/en active Active
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