CN214577497U - Mixed-flow water turbine with good vibration reduction effect - Google Patents
Mixed-flow water turbine with good vibration reduction effect Download PDFInfo
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- CN214577497U CN214577497U CN202120385355.2U CN202120385355U CN214577497U CN 214577497 U CN214577497 U CN 214577497U CN 202120385355 U CN202120385355 U CN 202120385355U CN 214577497 U CN214577497 U CN 214577497U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The utility model discloses an effectual mixed flow hydraulic turbine of damping, including vertical pivot, the casing that is located the pivot lower part, set up the runner of being connected in the casing and with the pivot lower extreme, around the spiral case of casing, the runner includes middle runner tail water awl, the casing includes the top cap, connects the lateral wall at the top cap edge, and the spiral case inboard is equipped with the seat ring, and the seat ring is including the inhalant canal who link up lateral wall and spiral case, still including the high-pressure gas generating device who has the output, be used for detecting mixed flow hydraulic turbine output's power detection device, the controller of being connected with power detection device, high-pressure gas generating device electricity respectively, be equipped with the air intake on the casing, high-pressure gas generating device's output is linked together with the air intake through connecting tube. The utility model discloses can solve the unit effectively and produce resonant problem to enlarge the operable condition scope of unit, and then make the unit satisfy the operation needs of different operating modes.
Description
Technical Field
The utility model relates to a hydraulic generator technical field, concretely relates to effectual mixed flow turbine of damping.
Background
With the enhancement of energy conservation and environmental protection awareness of people, hydroelectric power generation as a green energy source is being vigorously developed. Hydroelectric power generation usually depends on water flow with fall to apply work to a water turbine, so that the water turbine rotates at a high speed, and then a rotor of a generator is driven to rotate to generate electric energy. The francis turbine is a common form of a water turbine, and generally includes a rotating shaft, a casing disposed at a lower end of the rotating shaft, a circular volute surrounding the casing, a rotating wheel disposed in the casing, a fixed guide vane and a movable guide vane disposed inside the volute, wherein a cross section of the volute is circular, and a radius of the volute gradually decreases from head to tail. When water flow enters the fixed guide vane and the gap between the movable guide vanes through the volute and impacts the blades of the rotating wheel, the rotating wheel can be pushed to rotate, and then the generator is driven to generate electricity. The water flow after acting is discharged outwards through the tail water pipe. The angle of the fixed guide vane on the inner side of the volute is fixed, the fixed guide vane has the function of guiding water in the volute to the center for impacting the rotating wheel, and the angle of the movable guide vane is adjustable for impacting the water flow on the rotating wheel, so that the power generation power of the generator is adjusted.
It is known that when the output power of the mixed-flow water turbine enters a certain working condition to operate, a vortex band of water flow is generated in a tail water pipe, so that the vibration of a unit and an internal water body is caused, and the mixed-flow water turbine enters a vibration area; when the output power of the mixed-flow water turbine is operated by avoiding the working conditions, the unit can be stably operated. In order to avoid the vibration when the unit enters the vibration zone, people usually make the unit avoid the above working condition operation as much as possible, and although the problem of vibration can be solved to a certain extent, the working condition interval in which the unit can operate can be severely limited, and the unit is difficult to meet the operation requirements of different working conditions.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the problem that the existing mixed flow water turbine has an operating condition that can produce strong resonance, and then reduces suitable operating condition scope, providing an effectual mixed flow water turbine of damping, can solve the unit effectively and produce resonant problem to but enlarge the operating condition scope of unit, and then make the unit satisfy the operation needs of different operating modes.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides an effectual mixed flow hydraulic turbine of damping, includes vertical pivot, the casing that is located the pivot lower part, sets up the runner that is connected in the casing and with the pivot lower extreme, around the spiral case of casing, the runner includes middle runner tail water awl, the casing includes the top cap, connects the lateral wall at the top cap edge, and the spiral case inboard is equipped with the seat ring, and the seat ring is including the inhalant canal who link up lateral wall and spiral case, still including the high-pressure gas generating device who has the output, be used for detecting mixed flow hydraulic turbine output's power detection device, the controller of being connected with power detection device, high-pressure gas generating device electricity respectively, be equipped with the air intake on the casing, high-pressure gas generating device's output is linked together with the air intake through connecting tube.
As mentioned above, in the prior art, people usually adopt the passive "evading" mode to avoid the francis turbine to enter the vibration region, and the utility model discloses then creatively add a high-pressure gas generating device on current francis turbine. Like this, when power detection device detects mixed flow turbine work and when the output power who corresponds with the vibration district, the controller makes high-pressure gas generating device start and export high-pressure gas, and high-pressure gas can enter into in the casing through the air intake on the casing to form turbulent water body mixing together in the casing, then change the quality of water, and then change the vibration frequency isoparametric of water, avoid unit parts such as water and casing to produce resonance effectively.
That is to say, the utility model discloses a resonance phenomenon appears through the vibration frequency elimination resonance of initiative change water. When the unit changes the output power according to the power supply requirement, namely when the mixed-flow water turbine avoids the vibration area, the power detection device detects that the mixed-flow water turbine works to avoid the output power corresponding to the vibration area, and the controller stops the high-pressure gas generating device, so that the unit can be prevented from entering the vibration area to generate strong resonance all the time.
It is understood that the output power corresponding to the vibration region may include a middle control section, an early warning section before the control section, and an exit section after the control section. Therefore, when the power detection device detects the output power of the mixed-flow water turbine working in the early warning section, the controller can enable the high-pressure gas generation device to be started at low power and start to output part of high-pressure gas; when the power detection device detects the output power of the mixed-flow water turbine working at the control section, the controller enables the high-pressure gas generation device to run at full load to output high-pressure gas; when the power detection device detects the output power of the mixed-flow water turbine working at the exit section, the controller enables the high-pressure gas generation device to operate again at low power to output partial high-pressure gas until the mixed-flow water turbine completely crosses the output power corresponding to the vibration area.
Preferably, the high-pressure gas generator is a multi-stage high-pressure blower.
On one hand, the multistage high-pressure blower can form high-pressure airflow, and meanwhile, the multistage high-pressure blower has the advantages of small overall dimension and low cost and is suitable for long-time operation. In particular, the high-pressure air flow can be quickly started and formed, and the power of the high-pressure air flow can be conveniently controlled.
Preferably, the power detection device is a flow sensor for detecting the flow of water at the tail water cone of the runner.
It can be understood that the generator driven by the water turbine needs to adjust the output power timely according to the power supply requirement, and correspondingly, the mixed-flow water turbine also needs to adjust the output power timely. When the power of the mixed-flow water turbine is adjusted, the water flow at the tail water cone of the runner is correspondingly changed. The utility model discloses creatively detects runner tail water awl department rivers flow through flow sensor, detects the output of mixed-flow turbine indirectly to can greatly simplify power detection device's structure, and be favorable to promoting it and detect the precision.
Preferably, the connecting pipeline is provided with a bypass air supplementing pipeline, and the air supplementing pipeline is provided with a one-way valve which is in one-way conduction from the opening end of the air supplementing pipeline to the connecting pipeline.
When the high-pressure gas generating device operates, the generated high-pressure gas can enter the shell through the connecting pipeline, and the check valve arranged on the gas supplementing pipeline can prevent the high-pressure gas from leaking out through the gas supplementing pipeline.
When the power detection device detects that the mixed-flow water turbine works in the output power corresponding to the non-vibration area and close to the exit section, the controller stops the high-pressure gas generation device to save electric energy, at the moment, the water flow in the shell flows downwards to cause a certain degree of negative pressure, so that the check valve can be opened to suck partial external air, and resonance with the unit can be completely avoided by the water body in the shell. That is to say, set up the check valve and can realize the natural tonifying qi, both be favorable to reduce cost, be favorable to avoiding the vibration again.
Preferably, the air inlet is formed in the top cover, a flange connected with the rotating wheel is arranged at the lower end of the rotating shaft, and a plurality of communicated air holes are uniformly distributed in the circumferential direction on the flange.
When high-pressure gas enters the shell from the air inlet of the top cover, the high-pressure gas can enter the lower part of the rotating wheel through the communicating air hole arranged on the rotating shaft flange so as to be fully mixed with the water body in the shell, and then the density of the water body and other parameters related to the vibration frequency are changed.
As mentioned above, when the water flow in the shell flows downwards from the tail water cone of the rotating wheel, a certain degree of negative pressure is generated, so that the high-pressure air flow above the rotating wheel can be sucked below the rotating wheel through the communicating air holes, and the flow rate of the air is accelerated.
Therefore, the utility model discloses following beneficial effect has: the problem that the unit generates resonance can be effectively solved, so that the range of the operable working conditions of the unit is expanded, and the unit can meet the operation requirements of different working conditions.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the figure: 1. the device comprises a rotating shaft 11, a flange 12, a communicating air hole 2, a shell 21, a top cover 23, a water inlet channel 24, an air inlet 3, a rotating wheel 31, a rotating wheel tail water cone 4, a volute 5, a high-pressure gas generating device 6, a connecting pipeline 61, an air supplementing pipeline 7 and a one-way valve.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description.
As shown in fig. 1, a effectual francis turbine of damping, including vertical pivot 1, the casing 2 that is located the pivot lower part, set up in the casing and with the runner 3 that the pivot lower extreme is connected, around the spiral case 4 of casing, the runner includes middle runner tail water cone 31, around runner tail water cone and a plurality of blades of evenly distributed in circumference, the casing includes top cap 21, connects the lateral wall at the top cap edge, and the cross section of spiral case is personally submitted circularly, and the spiral case inboard is equipped with the seat ring, and the seat ring is including a plurality of inlet channel 23 that link up lateral wall and spiral case, and inlet channel interval distribution in circumference.
When water flow with a fall enters the shell through the volute and the water inlet channel and impacts the blades of the rotating wheel, the rotating wheel can be driven to rotate, then the rotating shaft is driven to rotate at a high speed, and further the generator rotor connected with the rotating shaft is driven to rotate and generate electricity. The water flow after doing work flows out downwards from a water flow outlet between the tail water cone of the rotating wheel and the shell.
It will be appreciated that in the case of francis turbines, as the runner rotates, the flow of water within the housing, particularly in the portion below the runner, becomes turbulent and produces some degree of vibration. When the rotating wheel reaches a certain rotating speed (namely the mixed-flow water turbine reaches a certain output power), the vibration frequency of the rotating wheel is close to the vibration frequency of a unit (comprising a shell, a rotating shaft and the like), so that resonance can be generated, the mixed-flow water turbine works in a vibration area, and the output power corresponding to the mixed-flow water turbine when the mixed-flow water turbine works in the vibration area is called as vibration power.
In order to avoid the phenomenon of strong resonance, the utility model discloses still including the high-pressure gas generating device 5 that has the output, be used for detecting mixed flow turbine output's power detection device, the controller of being connected with power detection device, high-pressure gas generating device electricity respectively to set up air intake 24 on the casing, high-pressure gas generating device's output is linked together through connecting tube 6 and air intake.
When the rotating speed of the rotating wheel is gradually accelerated and the power detection device detects that the output power of the mixed-flow water turbine reaches the vibration power, the controller enables the high-pressure gas generation device to be started to output high-pressure gas, the high-pressure gas can enter the shell through the air inlet in the shell and is mixed with the water body which forms turbulent flow in the shell, the quality of the water body is changed, the vibration frequency and other parameters of the water body are changed, and the resonance of the water body and the shell and other unit components is effectively avoided.
When the rotating speed of the rotating wheel continues to be increased and the power detection device detects that the output power of the mixed-flow water turbine is greater than the power corresponding to the vibration area, namely the working state of the mixed-flow water turbine crosses the vibration area, the controller can stop the high-pressure gas generating device, and at the moment, the mixed-flow water turbine can naturally avoid the vibration area and enter the normal working state.
That is to say, the utility model discloses a resonance phenomenon appears through the vibration frequency elimination resonance of initiative change water. When the unit enters the vibration area according to the power supply requirement, high-pressure gas is forcibly input into the shell through the high-pressure gas generating device, and then the unit is enabled to actively avoid the vibration area. And when the power detection device detects that the mixed-flow water turbine works to avoid the output power corresponding to the vibration area, the controller stops the high-pressure gas generating device, so that the unit can be prevented from entering the vibration area all the time to generate strong resonance, and the long-time continuous work of the high-pressure gas generating device is avoided.
In order to avoid the vibration region more effectively, the vibration power of the mixed-flow water turbine corresponding to the vibration region comprises a middle control section, an early warning section in front of the control section and an exit section behind the control section. Therefore, when the power detection device detects the output power of the mixed-flow water turbine working in the early warning section, the controller can enable the high-pressure gas generation device to be started at low power and start to output part of high-pressure gas; when the power detection device detects the output power of the mixed-flow water turbine working at the control section, the controller enables the high-pressure gas generation device to run at full load to output high-pressure gas; when the power detection device detects the output power of the mixed-flow water turbine working at the exit section, the controller enables the high-pressure gas generation device to operate again at low power to output partial high-pressure gas until the mixed-flow water turbine completely crosses the output power corresponding to the vibration area.
It should be noted that, when we divide the vibration power into a control section, an early warning section and an exit section, the range of the vibration power can be properly enlarged to really realize the effects of early warning and smooth exit, and ensure that the flow turbine completely avoids the resonance phenomenon.
Preferably, the high-pressure gas generating device is a multi-stage high-pressure blower, on one hand, the high-pressure gas generating device can be quickly started and generate a large amount of high-pressure gas flow, and meanwhile, the high-pressure gas generating device has the advantages of small overall dimension and low cost and is suitable for long-time operation.
Furthermore, the power detection device is a flow sensor for detecting the water flow at the tail water cone of the rotating wheel. It can be understood that the output power of the mixed-flow water turbine is related to the flow of the downward discharged water flow at the tail water cone of the rotating wheel, and the flow sensor can conveniently detect the water flow at the tail water cone of the rotating wheel, so as to indirectly detect and judge the output power of the mixed-flow water turbine, so that the structure of the power detection device is simplified, and the detection precision of the power detection device is improved.
Of course, the helical blades can also be arranged in the tail water cone of the rotating wheel. Like this, when the runner rotates at a high speed, the helical blade can drive air and discharge from the tail water cone export of runner tail water cone lower extreme to promote the negative pressure in the casing, be favorable to the air current to get into the runner below.
As a preferable scheme, a bypass air supply pipeline 61 can be arranged on the connecting pipeline, a one-way valve 7 is arranged on the air supply pipeline, and the one-way valve is in one-way conduction from the opening end of the air supply pipeline to the connecting pipeline. When the high-pressure gas generating device operates, the generated high-pressure gas can enter the shell through the connecting pipeline, and the check valve arranged on the gas supplementing pipeline can prevent the high-pressure gas from leaking out through the gas supplementing pipeline. When the power detection device detects the output power of the exit section of the mixed-flow water turbine working close to the vibration power, the controller can stop the high-pressure gas generating device to save the electric energy. At the moment, because the water flow in the shell flows downwards to cause a certain degree of negative pressure in the shell, the check valve can be opened to suck partial outside air so as to realize natural air supplement, and the water in the shell is favorably prevented from generating resonance with the unit completely.
In addition, the air inlet can be arranged on the top cover, the lower end of the rotating shaft is provided with a flange 11 connected with the rotating wheel, and the flange is provided with a plurality of communicating air holes 12 which are uniformly distributed in the circumferential direction.
When high-pressure gas enters the shell from the air inlet of the top cover, the high-pressure gas can enter the lower part of the rotating wheel through the communicating air hole arranged on the rotating shaft flange so as to be fully mixed with the water body in the shell, and then the density of the water body and other parameters related to the vibration frequency are changed.
Claims (5)
1. The utility model provides an effectual mixed flow hydraulic turbine of damping, includes vertical pivot, the casing that is located the pivot lower part, sets up the runner that is connected in the casing and with the pivot lower extreme, around the spiral case of casing, the runner includes middle runner tail water awl, the casing includes the top cap, connects the lateral wall at the top cap edge, and the spiral case inboard is equipped with the seat ring, and the seat ring is including the inhalant canal who link up lateral wall and spiral case, and characterized by still includes the high-pressure gas generating device who has the output, is used for detecting mixed flow hydraulic turbine output's power detection device, the controller of being connected with power detection device, high-pressure gas generating device electricity respectively, be equipped with the air intake on the casing, high-pressure gas generating device's output is linked together through connecting tube and air intake.
2. The francis turbine of claim 1, wherein the high pressure gas generator is a multi-stage high pressure blower.
3. The francis turbine of claim 1, wherein the power detector is a flow sensor for detecting the flow rate of water at the tail cone of the runner.
4. A francis turbine with good damping effect according to claim 1, wherein the connecting pipeline is provided with a bypass air supply pipeline, and the air supply pipeline is provided with a one-way valve which is communicated in one way from the opening end of the air supply pipeline to the connecting pipeline.
5. The francis turbine of claim 1, wherein the inlet is formed in the top cover, the lower end of the shaft is provided with a flange connected to the runner, and the flange is provided with a plurality of communicating air holes uniformly distributed in the circumferential direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120385355.2U CN214577497U (en) | 2021-02-20 | 2021-02-20 | Mixed-flow water turbine with good vibration reduction effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120385355.2U CN214577497U (en) | 2021-02-20 | 2021-02-20 | Mixed-flow water turbine with good vibration reduction effect |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214577497U true CN214577497U (en) | 2021-11-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120385355.2U Active CN214577497U (en) | 2021-02-20 | 2021-02-20 | Mixed-flow water turbine with good vibration reduction effect |
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|---|---|
| CN (1) | CN214577497U (en) |
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2021
- 2021-02-20 CN CN202120385355.2U patent/CN214577497U/en active Active
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