CN213451033U - Preposition device for improving cavitation performance of water pump - Google Patents
Preposition device for improving cavitation performance of water pump Download PDFInfo
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- CN213451033U CN213451033U CN202022319590.8U CN202022319590U CN213451033U CN 213451033 U CN213451033 U CN 213451033U CN 202022319590 U CN202022319590 U CN 202022319590U CN 213451033 U CN213451033 U CN 213451033U
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Abstract
The utility model discloses a preposed device for improving cavitation performance of a water pump, which comprises a first connecting flange, wherein the right end of the first connecting flange is provided with a shell, the shell is sequentially provided with a first cylindrical section, a conical section and a second cylindrical section which are smoothly connected from left to right, and the diameter of the first cylindrical section is larger than that of the second cylindrical section; a concentric lining is arranged in the shell, the left end of the lining is connected with the left end of the shell in a seamless mode, the outer surface of the right end of the lining is a conical surface and extends into the conical section of the shell, and an annular cavity is formed between the outer surface of the lining and the inner surface of the shell; a drainage tube is arranged on the first cylindrical section of the shell, and the other end of the drainage tube is communicated with a water outlet of the water pump; and a second connecting flange is arranged at the right end of the second cylindrical section of the shell. The utility model adds a preposed device in front of the centrifugal wheel to improve the cavitation performance of the water pump; the length of the rotor can be effectively shortened, and the operation reliability of the water pump is improved.
Description
Technical Field
The utility model relates to a water pump technical field specifically is a leading device of improvement water pump cavitation erosion performance.
Background
At present, in the domestic single-unit or two-stage horizontal water pump, in order to improve the cavitation performance, the cavitation performance of the water pump is generally improved by increasing the diameter of an impeller inlet or increasing an inducer. However, the two methods also have the following disadvantages:
the diameter of the inlet of the impeller is increased, the peripheral speed of the intersection of the inlet edge of the blade and the front cover plate of the impeller is also increased greatly, so that the local kinetic energy is increased, the pressure energy is reduced, the cavitation performance of the water pump is not improved, the diameter of the inlet of the impeller is increased, the efficiency of the impeller is reduced by 5-8%, and the scheme is mainly used for the water pump with small flow.
The inducer is added and mainly used for the medium-sized water pump with the speed of 60-120m 3/h. Along with the increase of the design flow of the water pump, the passing capacity of the inducer is reduced because the installation angle of the inlet of the inducer is smaller, and the diameter of the inducer needs to be increased. On the one hand, the speed of the outer edge of the inducer is increased after the diameter of the inducer is increased, the cavitation allowance of the water pump is not favorably improved, on the other hand, along with the increase of the diameter of the inducer, the diameter of an inlet of a centrifugal wheel behind the inducer is also correspondingly increased, the efficiency of the impeller is greatly reduced, and the impeller is not favorably energy-saving.
When the design flow of the water pump is large, the problem of serious cavitation is still required to be solved, and the operation reliability of the water pump is required to be improved.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: in order to overcome the problems, the preposed device for improving the cavitation performance of the water pump is provided.
The utility model provides a technical scheme that its technical problem adopted is: a preposed device for improving the cavitation performance of a water pump comprises a first connecting flange, wherein a shell is arranged at the right end of the first connecting flange, the shell is sequentially provided with a first cylindrical section, a conical section and a second cylindrical section which are smoothly connected from left to right, and the diameter of the first cylindrical section is larger than that of the second cylindrical section; a concentric lining is arranged inside the first cylindrical section and the conical section of the shell, the left end of the lining is connected with the left end of the shell in a seamless mode, the outer surface of the right end of the lining is a conical surface and extends into the conical section of the shell, an annular cavity is formed between the outer surface of the lining and the inner surfaces of the first cylindrical section and the conical section of the shell, and the right end of the cavity is a conical nozzle; a drainage tube is arranged on the first cylindrical section of the shell, and the other end of the drainage tube is communicated with a water outlet of the water pump; and a second connecting flange used for being connected with a water inlet of the water pump is arranged at the right end of the second cylindrical section of the shell.
Preferably, the diameter of the inner bore of the bushing is equal to the inner diameter of the second cylindrical section of the housing.
Preferably, the water flow at the nozzle is 3-5% of the design flow of the water pump.
Preferably, the gap of the nozzle is adjustable according to a flow rate or a pressure.
Preferably, the other end of the draft tube is communicated with a water outlet at the first-stage impeller of the water pump or other high-pressure pipelines with similar medium properties.
The utility model has the advantages that:
1. the front device is additionally arranged in front of the centrifugal wheel, high-pressure water is sprayed to the inlet of the centrifugal wheel, so that the kinetic energy of the inlet of the centrifugal wheel is increased, the cavitation performance of the water pump is improved, the diameter of the inlet of the centrifugal wheel is not required to be increased, and the efficiency of the water pump is improved;
2. when the design flow of the water pump is larger, the length of the rotor can be effectively shortened because an inducer is not needed, and the operation reliability of the water pump is improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2, the utility model discloses the installation schematic diagram in the water pump.
1. The device comprises a first connecting flange, 2, a shell, 201, a first cylindrical section, 202, a conical section, 203, a second cylindrical section, 3, a lining, 4, a cavity, 5, a nozzle, 6, a drainage tube, 7, a water outlet, 8 and a second connecting flange.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic drawings and illustrate, by way of illustration only, the basic structure of the invention, and therefore only show the components relevant to the invention.
As shown in fig. 1, a front device for improving cavitation performance of a water pump includes a first connecting flange 1, a housing 2 is disposed at a right end of the first connecting flange 1, the housing 2 is sequentially provided with a first cylindrical section 201, a conical section 202 and a second cylindrical section 203 which are connected smoothly from left to right, and a diameter of the first cylindrical section 201 is larger than a diameter of the second cylindrical section 203; a concentric bushing 3 is arranged inside the first cylindrical section 201 and the conical section 202 of the shell 2, the left end of the bushing 3 is connected with the left end of the shell 2 in a seamless manner, the outer surface of the right end of the bushing 3 is a conical surface and extends into the conical section 202 of the shell 2, an annular cavity 4 is formed between the outer surface of the bushing 3 and the inner surfaces of the first cylindrical section 201 and the conical section 202 of the shell 2, and the right end of the cavity 4 is a conical nozzle 5; a drainage tube 6 is arranged on the first cylindrical section 201 of the shell 2, and the other end of the drainage tube 6 is communicated with a water outlet 7 of the water pump; and a second connecting flange 8 used for being connected with a water inlet of a water pump is arranged at the right end of the second cylindrical section 203 of the shell 2.
Further, the diameter of the inner bore of the bushing 3 is equal to the inner diameter of the second cylindrical section 203 of the housing 2. The water flow at the nozzle 5 is 3-5% of the designed water pump flow. The energy consumption of the power fluid is reduced by this measure.
Further, the gap of the nozzle 5 can be adjusted according to the flow rate and the pressure. The outlet flow velocity of the nozzle 5 is too high, so that the loss of high-speed water and low-speed water is great when the high-speed water and the low-speed water are mixed, the power liquid is increased, the flow loss of the water pump is caused, and the efficiency of the water pump is not improved favorably.
Further, the other end of the draft tube 6 is communicated with a water outlet 7 at the first-stage impeller of the water pump or other high-pressure pipelines with similar medium properties.
The utility model discloses a theory of operation:
a preposed device is additionally arranged in front of an inlet of a water pump and is connected to an outlet of a first-stage impeller of the water pump or other high-pressure pipelines with similar medium properties, and when the device is operated, part of high-pressure water is led to the preposed device to form power liquid, enters an inlet of a centrifugal wheel through a nozzle in the device and is mixed with condensed water sucked by the water pump, so that the kinetic energy of the inlet of the centrifugal wheel of the water pump is increased, and the cavitation performance of the water pump is improved.
The utility model adds a preposed device in front of the centrifugal wheel, and sprays high-pressure water to the inlet of the centrifugal wheel, thereby increasing the kinetic energy of the inlet of the centrifugal wheel, improving the cavitation performance of the water pump, and improving the efficiency of the water pump without increasing the diameter of the inlet of the centrifugal wheel; when the design flow of the water pump is larger, the length of the rotor can be effectively shortened because an inducer is not needed, and the operation reliability of the water pump is improved.
In light of the foregoing description of the preferred embodiments of the present invention, it is to be understood that various changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention.
Claims (5)
1. The utility model provides an improve leading device of water pump cavitation performance which characterized in that: the connecting structure comprises a first connecting flange, wherein a shell is arranged at the right end of the first connecting flange, the shell is sequentially provided with a first cylindrical section, a conical section and a second cylindrical section which are connected smoothly from left to right, and the diameter of the first cylindrical section is larger than that of the second cylindrical section; a concentric lining is arranged inside the first cylindrical section and the conical section of the shell, the left end of the lining is connected with the left end of the shell in a seamless mode, the outer surface of the right end of the lining is a conical surface and extends into the conical section of the shell, an annular cavity is formed between the outer surface of the lining and the inner surfaces of the first cylindrical section and the conical section of the shell, and the right end of the cavity is a conical nozzle; a drainage tube is arranged on the first cylindrical section of the shell, and the other end of the drainage tube is communicated with a water outlet of the water pump; and a second connecting flange used for being connected with a water inlet of the water pump is arranged at the right end of the second cylindrical section of the shell.
2. The front-end device for improving the cavitation performance of the water pump as claimed in claim 1, wherein: the diameter of the inner bore of the bushing is equal to the inner diameter of the second cylindrical section of the housing.
3. The front-end device for improving the cavitation performance of the water pump as claimed in claim 1, wherein: the water flow at the nozzle is 3-5% of the designed water pump flow.
4. The front-end device for improving the cavitation performance of the water pump as claimed in claim 1, wherein: the gap of the nozzle can be adjusted according to the flow and the pressure.
5. The front-end device for improving the cavitation performance of the water pump as claimed in claim 1, wherein: the other end of the drainage tube is communicated with a high-pressure pipeline of a water outlet at the primary impeller of the water pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022319590.8U CN213451033U (en) | 2020-10-19 | 2020-10-19 | Preposition device for improving cavitation performance of water pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022319590.8U CN213451033U (en) | 2020-10-19 | 2020-10-19 | Preposition device for improving cavitation performance of water pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213451033U true CN213451033U (en) | 2021-06-15 |
Family
ID=76292216
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022319590.8U Active CN213451033U (en) | 2020-10-19 | 2020-10-19 | Preposition device for improving cavitation performance of water pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213451033U (en) |
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2020
- 2020-10-19 CN CN202022319590.8U patent/CN213451033U/en active Active
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