CN212389579U - High-speed centrifugal pump reverse-rotation hydraulic turbine device - Google Patents
High-speed centrifugal pump reverse-rotation hydraulic turbine device Download PDFInfo
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- CN212389579U CN212389579U CN202021244592.9U CN202021244592U CN212389579U CN 212389579 U CN212389579 U CN 212389579U CN 202021244592 U CN202021244592 U CN 202021244592U CN 212389579 U CN212389579 U CN 212389579U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The utility model belongs to fluid machinery and energy recuperation field. The technical scheme is as follows: a high-speed centrifugal pump reverse rotation hydraulic turbine device is characterized in that: the device comprises a volute, a turbine shaft, a guide shell fixed in an inner cavity of the volute, an impeller rotatably positioned in the guide shell and connected with the left end of the turbine shaft, and an inducer fixed at the left end of the impeller; the working medium flows along the volute inlet section, the volute inner cavity and the impeller and inducer of the guide shell inner cavity and the volute outlet section in sequence; the wall of the diversion shell is provided with a plurality of spray holes which are distributed in a circumferential manner, the spray holes are communicated with the inner cavity of the volute and the inner cavity of the diversion shell, the left end face of the diversion shell is provided with an extension section which extends into the outlet section of the volute, and the inducer is arranged in the extension section; the central axis of the volute, the central axis of the guide shell, the rotating axis of the impeller, the rotating axis of the inducer and the rotating axis of the turbine shaft are coaxially arranged. The device can be suitable for the operating mode of low flow high abundant energy, and energy recuperation is efficient, the operation is reliable.
Description
Technical Field
The utility model belongs to fluid machinery and energy recuperation field specifically are a hydraulic turbine device is done in high-speed centrifugal pump reversal.
Background
The hydraulic turbine is used as an energy recovery device, is applied to the flow industry fields of petrochemical industry and the like, and effectively saves energy. However, under the working conditions that the flow rate is relatively small but the surplus energy is relatively high, the recoverable energy is generally considered to be low, meanwhile, the design and development difficulty of the matched hydraulic turbine is relatively high, the conventional method is to consume the surplus energy through the modes of backflow of the working medium or emptying of a pressure release valve and the like, and the great waste is caused.
In the field of petrochemical industry, the hydraulic turbine devices commonly used at home and abroad are mainly characterized by reverse rotation of a pump as a hydraulic turbine, and the hydraulic turbine is generally used for the flow rate of more than 30m3The problem that the high-efficiency area is relatively narrow, the adaptability of the flow working condition is poor and the like generally exists under the working condition of/h. CN201020135834.0 discloses an impeller inlet design when a pump reversely rotates to make hydraulic turbine, which improves the efficiency of the pump reversely rotating to make hydraulic turbine by changing the sharp corner of the impeller inlet, and reduces the impact loss of the impeller inlet, but this structure does not specifically consider the operation condition of low flow, high and abundant energy. CN201710398967.3 discloses a hydraulic turbine in which the direction of the casing outlet is perpendicular to the direction of the impeller, which solves the problem of serious hydraulic efficiency loss existing in the part between the impeller outlet and the casing outlet through which the fluid flows, but the hydraulic loss of the water inlet section of the hydraulic turbine is not considered in this structure.
There is therefore a need for a new type of pump reverse-acting hydraulic turbine device for smaller flows(flow rate less than 20m3H) but the surplus energy is higher (the lift is more than 100 m).
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming not enough among the above-mentioned background art, providing a hydraulic turbine device is done in high-speed centrifugal pump reversal, the device should be able to be applicable to the operating mode of the abundant energy of low discharge, has energy recuperation efficiency height, the reliable characteristics of operation.
The technical scheme of the utility model is that:
a high-speed centrifugal pump reverse rotation hydraulic turbine device is characterized in that: the device comprises a volute, a turbine shaft, a guide shell fixed in an inner cavity of the volute, an impeller rotatably positioned in the guide shell and connected with the left end of the turbine shaft, and an inducer fixed at the left end of the impeller; the working medium flows along the volute inlet section, the volute inner cavity, the impeller and inducer of the guide shell inner cavity and the volute outlet section in sequence; the wall of the diversion shell is provided with a plurality of spray holes which are distributed in a circumferential manner, the spray holes are communicated with the inner cavity of the volute and the inner cavity of the diversion shell, the left end face of the diversion shell is provided with an extension section which extends into the outlet section of the volute, and the inducer is arranged in the extension section; the central axis of the volute, the central axis of the guide shell, the rotating axis of the impeller, the rotating axis of the inducer and the rotating axis of the turbine shaft are coaxially arranged.
The cross section of the inlet section of the volute can also be of equal area and does not necessarily gradually reduce. As long as the diameter of the nozzle is ensured, the performance of the hydraulic turbine can be ensured, and the structural parameters of the volute are not particularly obviously influenced.
The guide shell is provided with a nozzle, the nozzle is installed in each spray hole through a thread structure, and the axis of the nozzle and the rotation axis of the impeller keep a certain included angle.
The inducer is a reverse-conical inducer, the diameter of the top of the inducer blade is gradually increased along the flowing direction of the working medium, and the inlet angle of the inducer blade is equal to the outlet angle of the impeller blade.
A sealing structure is arranged between the outer circumferential surface of the extension section and the inner wall of the volute; the inner diameter of the extension section is gradually increased along the flowing direction of the working medium.
And a flow guide pipe is arranged in the volute outlet section.
The utility model has the advantages that:
1. the utility model can satisfy the working condition of low flow and high and abundant energy, improve the efficiency of the hydraulic turbine and the economical efficiency of the whole machine, and lead the hydraulic turbine to be capable of efficiently and economically recovering abundant energy;
2. the utility model adopts the modularized design, can reduce the energy loss during recovery, and simultaneously realizes the replacement of the structural parameters of rotor components such as the matching impeller and the inducer without changing the overall structure of the volute, thereby enlarging the application range of a single hydraulic turbine device;
3. the nozzle of the utility model is a replaceable structure, and can select a proper nozzle according to the flow working condition range, thereby improving the energy conversion efficiency at the impeller and improving the energy recovery efficiency of the working medium;
4. the utility model discloses an inducer adopts the design of anti-cone type, and the blower inlet casing extension section is crescent expansion shape, and overall structure is simple, inducer processing and simple to operate, and inducer and impeller constant speed are rotatory to make the flow of working medium more steady simultaneously, have reduced the energy loss in the impeller exit, have promoted the energy recuperation efficiency of device as far as possible.
Drawings
Fig. 1 is a schematic view of the structure of the present invention.
Fig. 2 is a schematic sectional structure diagram of the volute of the present invention.
Fig. 3 is a left side view structure diagram of the middle diversion shell and the inducer of the present invention.
Fig. 4 is a schematic view of the structure of the middle diversion shell of the present invention.
Fig. 5 is a front view of the impeller and the inducer of the present invention.
Detailed Description
The traditional centrifugal pump is reversely rotated to be a hydraulic turbine and comprises a turbine shaft, a volute and an impeller, wherein the impeller is arranged in an inner cavity of the volute, the turbine shaft and the impeller are fixed and can integrally rotate along with the impeller, and the turbine shaft passes through a main shaft 10 of a gear box and then is connected with a generator set or a load through a coupler. The traditional hydraulic turbine principle is as follows: the high-pressure flowing working medium flows into the volute from the inlet section, the pressure energy of the high-pressure flowing working medium is converted into kinetic energy to drive the impeller and the turbine shaft to rotate, and finally the high-pressure flowing working medium flows out of the outlet section, and the turbine shaft drives the generator set or the load to do work outwards, so that the energy recycling of the high-pressure flowing working medium is completed.
The present invention will be further described with reference to the drawings attached to the specification, but the present invention is not limited to the following embodiments.
As shown in fig. 1, a high-speed centrifugal pump reverse-rotation hydraulic turbine device comprises a volute 1, a turbine shaft 2, a guide shell 3, an impeller 4 and an inducer 5. The working medium flows along the volute inlet section, the volute inner cavity, the impeller and the inducer of the guide shell inner cavity and the volute outlet section in sequence.
The inlet section 1.1 of the volute is connected with the outer circumferential surface of the volute, the outlet section 1.2 of the volute is connected with the left side end face of the volute, the cross section of the inlet section is circular, and the outlet section is also provided with a flow guide pipe 7. The volute is calculated by adopting the following formula:
D1＝(1.5～2.0)D2
wherein D is1Is the diameter of the base circle of the volute, D2The diameter of the outlet section.
The inlet section of the volute is connected with the outer circumferential surface of the volute by a certain spiral angle, so that the working medium can better enter the volute and is transited from the inlet section to the inner cavity of the volute, the spiral angle is an included angle between a tangent line of a central axis (the central axis is a spiral line) of the inlet section and a tangent line of a base circle of the volute, and in order to enable the working medium to enter the volute without impact, a liquid flow angle of an absolute speed at an impeller outlet is generally used as the spiral angle, and the following formula is adopted for:
wherein alpha is0Is the helix angle, vm1For inducing the speed v of the shaft surface at the outlet of the wheelu2The speed is divided into the peripheral speed of the inducer outlet.
The guide shell is fixed in the inner cavity of the volute, a plurality of spray holes 3.1 are formed in the shell wall of the guide shell, two ends of each spray hole are respectively located on the outer circumferential surface of the guide shell and the inner wall of the guide shell, the spray holes are distributed circumferentially and are communicated with the inner cavity of the volute and the inner cavity of the guide shell, and a spray nozzle 6 is further installed in each spray hole through a thread structure. The left end face of the diversion shell is provided with an extension section 3.2 protruding towards the left side, the extension section extends into the outlet section of the volute, a sealing structure is arranged between the outer circumferential face of the extension section and the inner wall of the volute, and the inner diameter of the extension section is gradually increased along the flowing direction of the working medium. The sealing arrangement comprises a groove 3.3 arranged on the outer circumferential surface of the extension and a sealing ring (not shown) arranged in the groove.
The nozzle is connected with the spray holes by adopting a threaded structure, so that the nozzles with different throat areas can be conveniently replaced under different working conditions, and the adaptability and the operating range of the hydraulic turbine device are improved. The axis of the nozzle and the rotation axis of the impeller keep a certain included angle, so that the working medium is introduced into the impeller at a certain angle, the energy loss caused by sputtering of the working medium on the impeller is reduced, the tail end of the nozzle extends into the inner cavity of the guide shell and keeps a certain gap with the impeller, and the nozzle and the impeller can be prevented from being collided and abraded. The parameters of the nozzle are calculated by adopting the following formula:
wherein D isCIs the nozzle diameter, Q is the inlet section flow, μ is the flow coefficient, and H is the nozzle operating pressure.
The impeller is rotatably positioned in the guide shell, the left end of the turbine shaft extends into the inner cavity of the volute and is fixed with the impeller, and the inducer is arranged in the extension section and is coaxially fixed with the impeller. The inducer is a reverse-conical inducer, the inlet angle of the inducer blade is equal to the outlet angle of the impeller blade (so as to reduce flow loss), and the diameter of the blade top of the inducer blade (the outer edge of the blade) is gradually increased along the flow direction of the working medium.
The central axis of the volute, the central axis of the guide shell, the rotating axis of the impeller, the rotating axis of the inducer and the rotating axis of the turbine shaft are coaxially arranged.
The utility model discloses improve spiral case structure: in order to ensure that the working medium has a better flowing state before entering the impeller, an inlet section with a certain length is arranged before entering the inner cavity of the volute, so that the disorder degree of the working medium is reduced, meanwhile, a separation tongue is also eliminated in the volute, and the working medium directly enters the inner cavity of the volute after passing through the inlet section; the replaceable nozzle is arranged on the guide shell, and the working medium is concentrated and directly introduced into the impeller through the nozzle, so that the energy loss caused by dispersion of the working medium in the volute is reduced, and the utilization efficiency of energy is improved; the exit of impeller is equipped with the extension section of blower inlet housing, is equipped with the inducer of anti-toper in the extension section, and the working medium gets into the inducer after the impeller flows out, through the cooperation of extension section and inducer, can make the working medium still can maintain similar flow state and can not become disorderly after flowing out the impeller, carries out the pressure boost to the working medium in exit when improving the cavitation phenomenon in impeller exit when the device does hydraulic turbine to promote energy recuperation and utilize efficiency.
The above embodiments are only examples of the present invention, and obviously, the present invention is not limited to the above embodiments, and many similar variations or modifications can be made, and those skilled in the art can easily imagine the similar variations or modifications directly or indirectly from the disclosure of the present invention, so that these variations or modifications are still the protection scope of the present invention.
Claims (5)
1. A high-speed centrifugal pump reverse rotation hydraulic turbine device is characterized in that: the device comprises a volute (1), a turbine shaft (2), a guide shell (3) fixed in an inner cavity of the volute, an impeller (4) which is rotatably positioned in the guide shell and connected with the left end of the turbine shaft, and an inducer (5) fixed at the left end of the impeller; the working medium flows along the volute inlet section, the volute inner cavity, the impeller and inducer of the guide shell inner cavity and the volute outlet section in sequence; the wall of the diversion shell is provided with a plurality of spray holes (3.1) distributed in the circumferential direction, the spray holes are communicated with the inner cavity of the volute and the inner cavity of the diversion shell, the left end face of the diversion shell is provided with an extension section (3.2) extending into the outlet section of the volute, and the inducer is arranged in the extension section; the central axis of the volute, the central axis of the guide shell, the rotating axis of the impeller, the rotating axis of the inducer and the rotating axis of the turbine shaft are coaxially arranged.
2. The high-speed centrifugal pump reverse-rotation hydraulic turbine device as claimed in claim 1, wherein: and the guide shell is provided with a nozzle (6), the nozzle is arranged in each spray hole through a thread structure, and the axis of the nozzle and the rotation axis of the impeller keep a certain included angle.
3. The high-speed centrifugal pump reverse-rotation hydraulic turbine device as claimed in claim 2, wherein: the inducer is a reverse-conical inducer, the diameter of the top of the inducer blade is gradually increased along the flowing direction of the working medium, and the inlet angle of the inducer blade is equal to the outlet angle of the impeller blade.
4. A high-speed centrifugal pump reverse-rotation hydraulic turbine device as defined in claim 3, wherein: a sealing structure is arranged between the outer circumferential surface of the extension section and the inner wall of the volute; the inner diameter of the extension section is gradually increased along the flowing direction of the working medium.
5. The high-speed centrifugal pump reverse-rotation hydraulic turbine device as claimed in claim 4, wherein: a guide pipe (7) is arranged in the volute outlet section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202021244592.9U CN212389579U (en) | 2020-06-30 | 2020-06-30 | High-speed centrifugal pump reverse-rotation hydraulic turbine device |
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| CN202021244592.9U CN212389579U (en) | 2020-06-30 | 2020-06-30 | High-speed centrifugal pump reverse-rotation hydraulic turbine device |
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| CN212389579U true CN212389579U (en) | 2021-01-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111649004A (en) * | 2020-06-30 | 2020-09-11 | 浙江理工大学 | High-speed centrifugal pump reverse-rotation hydraulic turbine device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111649004A (en) * | 2020-06-30 | 2020-09-11 | 浙江理工大学 | High-speed centrifugal pump reverse-rotation hydraulic turbine device |
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