CN111075749A - Intelligent anti-surge device of ultrahigh-speed centrifugal fan - Google Patents
Intelligent anti-surge device of ultrahigh-speed centrifugal fan Download PDFInfo
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- CN111075749A CN111075749A CN201911372023.4A CN201911372023A CN111075749A CN 111075749 A CN111075749 A CN 111075749A CN 201911372023 A CN201911372023 A CN 201911372023A CN 111075749 A CN111075749 A CN 111075749A
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- 238000012544 monitoring process Methods 0.000 claims abstract description 18
- 230000001105 regulatory effect Effects 0.000 claims abstract description 12
- 230000001276 controlling effect Effects 0.000 claims abstract 3
- 238000005259 measurement Methods 0.000 claims description 26
- 230000008859 change Effects 0.000 claims description 9
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 230000029058 respiratory gaseous exchange Effects 0.000 claims 1
- 230000002265 prevention Effects 0.000 abstract description 2
- 239000002131 composite material Substances 0.000 description 9
- 230000009471 action Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000035484 reaction time Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/02—Surge control
- F04D27/0261—Surge control by varying driving speed
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- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The invention relates to an active intelligent anti-surge device of an ultra-high speed centrifugal fan, which comprises a fan running state monitoring system, a fan measuring and controlling system, a combined type vent valve and a frequency converter, wherein the fan running state monitoring system monitors parameters such as wind pressure, wind volume, bearing vibration, motor current and the like, the fan running state fed back by the fan monitoring system is discriminated in real time, if surge signs appear, a surge relieving measure is automatically adopted, the combined type vent valve is a multifunctional vent valve integrating a power regulating valve and a mechanical pressure relief valve, the frequency converter controls a motor to adjust the running rotating speed in real time, and the device can ensure that active prevention is carried out in the early stage of fan surge, the surge is relieved in time when the surge occurs, and the damage of the surge to the ultra-high speed centrifugal fan is avoided.
Description
Technical Field
The invention relates to the field of intelligent detection devices, in particular to an intelligent anti-surge device of an ultrahigh-speed centrifugal fan.
Background
The fan surge refers to a pulsation phenomenon of pressure and flow generated when a fan works in an unstable area. When the fan surging, the flow and pressure of the fan change repeatedly and periodically, sometimes the change is large, and zero value or even negative value appears. The violent impact of air flow can be caused by the violent fluctuation of the flow and the pressure of the fan, so that the fan can vibrate violently, and the working noise of the fan is increased. For a high-capacity and high-pressure head fan, if surge occurs, equipment and a bearing can be damaged, accidents are caused, and the safe operation of a boiler is directly influenced.
The following is generally adopted to prevent the surge of the fan: 1) keeping the fan working in a stable area; 2) recirculation is used. Part of the discharged gas is led back to the inlet of the fan, so that the fan cannot enter an unstable area to work due to too small flow; 3) and a deflation valve is additionally arranged. When the delivery flow is smaller than or close to the surge flow, opening the air release valve to release part of gas, reducing the pressure of the pipeline and avoiding surging; 4) and the flow of the fan is changed by adopting a proper adjusting mode.
At present, passive anti-surge measures such as a mechanical emptying valve and a pressure release valve are mainly adopted by a main flow fan, but the measures cannot meet the surge protection requirement of the ultra-high speed centrifugal fan. For some ultrahigh-speed centrifugal fans, an electric regulating valve is mainly adopted to replace a mechanical anti-surge valve, the mechanical anti-surge valve is connected with an electric control system, and the electric regulating valve is automatically regulated according to system detection data feedback to realize automatic surge relief.
Aiming at the ultrahigh-speed centrifugal fan, the rotating speed is very high, the linear speed at the maximum diameter position of a centrifugal impeller can reach or exceed the sound velocity, the requirement on surge protection is very strict, otherwise, the surge can cause direct damage of the ultrahigh-speed centrifugal fan, and more reliable anti-surge measures are needed, but the existing anti-surge measures mainly have the following problems:
1. the passive anti-surge measures mainly comprise an emptying valve, a pressure release valve and the like, and the main working principle is that when equipment surges, the anti-surge valve acts to release gas once the set protective pressure is reached due to large pressure fluctuation, so that the surge of the fan is relieved. The method has the main defects that the surge can not be actively prevented in the early stage of the surge, only after the surge occurs, the surge can be passively removed, and the equipment damage caused by the surge of the ultra-high speed centrifugal fan can not be avoided.
2. For the ultra-high speed centrifugal fan, an electric regulating valve and the like are generally adopted and connected with an electric control system, and the electric regulating valve is automatically regulated according to the feedback of system detection data, so that automatic surge relief is realized. The method belongs to a semi-active anti-surge measure, and has a certain automation level, but the intelligent level is not high, the action time of an electric regulating valve depends on the acquisition and processing of real-time data and the feedback time of a system, and the overlong anti-surge reaction time is fatal to an ultrahigh-speed centrifugal fan, so that the direct damage of equipment can be caused.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an active intelligent anti-surge device for an ultra-high speed centrifugal fan, which realizes active prevention in the early stage of the surge of the fan and timely anti-surge when the surge occurs, and avoids the damage of the surge to the ultra-high speed centrifugal fan.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the active intelligent anti-surge device of the ultra-high-speed centrifugal fan comprises a fan running state monitoring system, a fan measurement and control system, a combined type blow-down valve and a frequency converter, wherein the frequency converter drives a motor of the fan to rotate, the fan running state monitoring system monitors outlet air pressure, outlet air quantity, bearing vibration level and motor current and feeds monitoring signals back to the fan measurement and control system, and the combined type blow-down valve or the frequency converter is controlled by the fan measurement and control system.
If the fan runs at the surge edge, the vibration data is increased, the fluctuation of the air quantity and the air pressure is small, and the current of the motor is small, the measurement and control system sends an instruction to the frequency converter at the moment, and the fan running parameters are adjusted through the frequency converter to actively relieve the surge.
If the fan monitoring system feeds back data to display that the fan is in a severe surge state, the fan measurement and control system sends an instruction to the frequency converter to reduce the running rotating speed of the fan, and meanwhile, the fan measurement and control system gives an instruction to the combined type emptying valve to open the combined type emptying valve, so that high-speed airflow at the air outlet of the air blower is emptied, and the problem that the equipment is damaged due to backflow of the high-speed airflow is avoided.
Preferably, the fan measurement and control system adopts a multi-state parameter coupling identification mode to comprehensively judge the running state of the fan. And according to the fluctuation of the outlet pressure and the flow, the change rate of the outlet pressure and the flow is used as a surge identification index, the bearing vibration level of the fan and the change rate of the motor current are coupled at the same time, if the parameters reach set values, the condition that the fan surging occurs is judged, and the operation parameters of the fan need to be adjusted and the surging is relieved.
Preferably, the combined type emptying valve is a multifunctional emptying valve integrating an electric regulating valve and a mechanical pressure relief valve. When the fan surges, the measurement and control system sends out an instruction to open the composite emptying valve, and if the surge capacity is very high and the outlet pressure fluctuates violently, the composite emptying valve can be automatically opened when the pressure reaches the set pressure, so that the active surge relief is realized.
Preferably, the combined type blow-down valve has the functions of automation of electric regulation and automatic overpressure protection of the mechanical pressure relief valve, so that the intelligent level of the anti-surge device is improved on one hand, and the active surge-relieving protection function during the failure of an electrical element is also avoided on the other hand.
The ultra-high speed centrifugal blower adopts a frequency converter to drive a motor to operate, and meanwhile, the motor can be controlled by the frequency converter in real time to adjust the operating rotating speed. When the measurement and control system identifies that the fan is in a surge state, the frequency converter is controlled to adjust the rotating speed of the motor, so that the outlet air quantity and the air pressure parameter of the fan are changed, the surge is relieved in advance, and equipment damage caused after surge expansion is avoided.
The invention has the beneficial effects that:
1. the intelligent level is high.
The intelligent anti-surge device of the ultrahigh-speed centrifugal fan is high in intelligent level, the running parameters of the fan can be monitored in real time, the running state of the fan can be automatically identified, the fan can be actively stopped in the initial surge stage, and equipment damage caused after surge expansion is avoided.
2. The protection function is more complete.
The intelligent anti-surge device for the ultra-high-speed centrifugal fan adopts the combined type emptying valve, combines the advantages of high automation level of the electric regulating valve and high reliability of the mechanical pressure relief valve, can effectively realize surge relief when a surge phenomenon occurs, has a dual protection function, and avoids the damage of key parts of the ultra-high-speed centrifugal fan caused by untimely surge relief.
Meanwhile, in the surge relieving process of the composite emptying valve, the frequency converter can also act, so that the energy input of equipment is reduced, the surge energy is reduced, and the effect of protecting the safe operation of the equipment is also achieved.
3. The reaction time is short.
The intelligent anti-surge device for the ultra-high-speed centrifugal fan adopts a mode of combining a fan state monitoring system, a fan measurement and control system and the like, monitors the operation parameters of the fan in real time, judges the operation parameters in real time, issues instructions through the fan measurement and control system once surge signs exist, adjusts the operation parameters of the fan in real time and actively relieves surge, the whole identification and action process can be controlled within about 0.1s, the reaction time is extremely short, and the surge protection effect on the ultra-high-speed centrifugal fan is obvious.
Drawings
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
Fig. 1 is a control schematic diagram of an active intelligent anti-surge device.
FIG. 2 is a schematic diagram of the operation of the compound blow-down valve.
1-an electromagnetic valve; 2-a membrane; 3-pressure equalizing holes; 4-an air inlet; and 5, air outlet.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it is also to be noted that the terms "disposed," "mounted," "connected," and the like are to be construed broadly unless otherwise specifically stated or limited. For example, the connection can be fixed, detachable or integrated; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, the active intelligent anti-surge device of the ultra-high speed centrifugal fan comprises a fan operation state monitoring system, a fan measurement and control system, a combined type blow-down valve and a frequency converter, wherein the frequency converter drives a motor of the fan to rotate, the fan operation state monitoring system monitors the outlet air pressure, the outlet air volume, the bearing vibration level and the motor current and feeds monitoring signals back to the fan measurement and control system, and the fan measurement and control system controls the combined type blow-down valve or the frequency converter. The intelligent recognition of the fan surge state is realized, the combined type emptying valve and the frequency converter are controlled through the fan measurement and control system, and the functions of real-time adjustment of the fan operation parameters, timely surge relief and the like in the surge state are realized.
The destructiveness of surging on the ultra-high speed centrifugal fan is extremely high, the surging phenomenon of the ultra-high speed centrifugal fan cannot be completely avoided due to the fluctuation of parameters of an air supply system, and once surging occurs, the outlet air pressure, the outlet air volume, bearing vibration, motor current and the like of the fan all change suddenly. Because the equipment is very sensitive to surge, the invention applies the fan running state monitoring system to monitor parameters such as wind pressure, wind volume, bearing vibration, motor current and the like, and once the surge sign appears, the parameters can be fed back to the fan measurement and control system to identify the running state of the fan.
For the fan measurement and control system, the running state of the fan fed back by the monitoring system is received and discriminated in real time, and if surge signs appear, the measure of relieving surge is automatically taken. If the fan runs at the surge edge, the vibration data is increased, the fluctuation of the air quantity and the air pressure is small, and the current of the motor is small, the measurement and control system sends an instruction to the frequency converter at the moment, and the fan running parameters are adjusted through the frequency converter to actively relieve the surge. If the fan monitoring system feeds back data to display that the fan is in a severe surge state, the fan measurement and control system sends an instruction to the frequency converter to reduce the running rotating speed of the fan, and meanwhile, the fan measurement and control system gives an instruction to the combined type emptying valve to open the combined type emptying valve, so that high-speed airflow at the air outlet of the air blower is emptied, and the problem that the equipment is damaged due to backflow of the high-speed airflow is avoided.
In order to prevent the false recognition of the surge state, the invention adopts a multi-state parameter coupling recognition mode to comprehensively judge the running state of the fan. And (3) the fluctuation of the outlet pressure and the flow is used as an identification index of surge through the change rate of the outlet pressure and the flow, the bearing vibration level of the fan and the change rate of the motor current are coupled at the same time, if the parameters reach set values, the condition that the fan surging occurs is judged, and the operation parameters of the fan need to be adjusted and the surging is relieved.
For the composite emptying valve, the action speed and the action time of the composite emptying valve are directly related to the protection function of the anti-surge device. The combined type emptying valve is a multifunctional emptying valve integrating an electric regulating valve and a mechanical pressure relief valve. When the fan surges, the measurement and control system sends out an instruction to open the composite emptying valve, and if the surge capacity is very high and the outlet pressure fluctuates violently, the composite emptying valve can be automatically opened when the pressure reaches the set pressure, so that the active surge relief is realized. The combined type emptying valve combines the functions of automation of electric regulation and automatic overpressure protection of the mechanical pressure release valve, so that the intelligent level of the anti-surge device is improved on one hand, and the active surge-relieving protection function during the failure of an electrical element is also avoided on the other hand.
The working principle of the composite emptying valve is mainly to utilize the pressure difference between two sides of the diaphragm 2, and the emptying valve can be opened under the condition that the pressure difference between the two sides is enough to overcome the elastic force of the spring, and the specific structural form is shown in figure 2. The diaphragm 2 is provided with a pressure equalizing hole 3, the pressure difference between two sides of the pressure equalizing hole is controlled by an electromagnetic valve, the electromagnetic valve is opened, one end of the pressure equalizing hole is atmospheric pressure P0, the other end of the pressure equalizing hole is fan outlet pressure, if the driving force generated by the pressure difference between two sides can overcome the spring force, the emptying valve is opened, and the gas flows from the gas inlet 4 to the gas outlet 5, wherein the direction is L2. If the electromagnetic valve is closed, high-pressure air flow enters the left cavity under the action of the pressure equalizing hole 3, after a period of time, the air pressures on the two sides are consistent, the emptying valve is closed under the action of the spring force, and the initial flowing direction of the air is shown as L1.
If the air outlet pipeline is suddenly blocked or the valve is suddenly closed due to system reasons, the air pressure at the outlet is instantaneously increased, the pressure equalizing holes cannot equalize the pressures at the left side and the right side, and under the condition that the electromagnetic valve is closed, if the instantaneous pressure difference exceeds the set value of the spring, the emptying valve can be opened, effective anti-surge is realized, and the reliability of the anti-surge device of the ultra-high speed centrifugal fan is ensured.
The diameter of the pressure equalizing hole 3 is D, the aperture of the pressure equalizing hole is 1-1.5% D, and the aperture of the pressure equalizing hole 3 can control the opening and closing time of the composite emptying valve.
The ultra-high speed centrifugal blower adopts a frequency converter to drive a motor to operate, and meanwhile, the motor can be controlled by the frequency converter in real time to adjust the operating rotating speed. When the measurement and control system identifies that the fan is in a surge state, the frequency converter is controlled to adjust the rotating speed of the motor, so that the outlet air quantity and the air pressure parameter of the fan are changed, the surge is relieved in advance, and equipment damage caused after surge expansion is avoided.
Claims (6)
1. The utility model provides a device is prevented breathing heavily by hypervelocity centrifugal fan intelligence, includes fan running state monitoring system, fan system of observing and controling, combined type atmospheric valve and converter, its characterized in that: the motor of converter drive fan rotates, fan running state monitoring system monitor export wind pressure size, export amount of wind size, bearing vibration level and motor current size and feed back monitoring signal to fan observing and controlling system, again by fan observing and controlling system right combined type atmospheric valve or the converter control.
2. The surge-preventing apparatus as defined in claim 1, wherein: the fan measurement and control system adopts a multi-state parameter coupling identification mode.
3. The surge-preventing apparatus as defined in claim 2, wherein: the multi-state parameter coupling identification mode is that according to fluctuation of outlet pressure and flow, change rates of the outlet pressure and the flow are used as identification indexes of surge, simultaneously, the vibration level of a bearing of the fan and the change rate of motor current are coupled, if the parameters reach set values, the condition that the fan surging occurs is judged, and adjustment and surge relief of fan operation parameters are needed.
4. The surge-preventing apparatus as defined in claim 1, wherein: if the fan monitoring system feeds back data to display that the fan is in a severe surge state, the fan measurement and control system sends an instruction to the frequency converter to reduce the running rotating speed of the fan, and meanwhile, the fan measurement and control system gives an instruction to the combined type emptying valve to open the combined type emptying valve, so that the high-speed airflow at the air outlet of the fan is emptied.
5. The surge-preventing apparatus as defined in claim 1, wherein: the combined type emptying valve is a multifunctional emptying valve integrating an electric regulating valve and a mechanical pressure relief valve.
6. The surge-preventing apparatus as defined in claim 4, wherein: when the fan surging, the measurement and control system can send out the instruction, makes the combined type atmospheric valve open, if the surge ability is very big, and the export pressure fluctuation is violent, then the combined type atmospheric valve can be opened automatically when pressure reaches the settlement pressure, realizes initiatively moving back the surge.
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| CN201911372023.4A CN111075749B (en) | 2019-12-27 | 2019-12-27 | Intelligent anti-surge device of ultrahigh-speed centrifugal fan |
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| CN201911372023.4A CN111075749B (en) | 2019-12-27 | 2019-12-27 | Intelligent anti-surge device of ultrahigh-speed centrifugal fan |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114876851A (en) * | 2022-05-18 | 2022-08-09 | 山东硕源动力科技有限公司 | Air suspension fan control system |
| CN115467851A (en) * | 2022-09-21 | 2022-12-13 | 烟台东德实业有限公司 | Method for monitoring and preventing surge of air compressor |
| CN117108540A (en) * | 2023-10-12 | 2023-11-24 | 山东天瑞重工有限公司 | Anti-surge and pressure maintaining control method and system for magnetic levitation blower |
| WO2024183185A1 (en) * | 2023-03-09 | 2024-09-12 | 明程电机技术（深圳）有限公司 | Aquaculture water oxygenation system and oxygenation control method |
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| WO2024183185A1 (en) * | 2023-03-09 | 2024-09-12 | 明程电机技术（深圳）有限公司 | Aquaculture water oxygenation system and oxygenation control method |
| CN117108540A (en) * | 2023-10-12 | 2023-11-24 | 山东天瑞重工有限公司 | Anti-surge and pressure maintaining control method and system for magnetic levitation blower |
| CN117108540B (en) * | 2023-10-12 | 2023-12-19 | 山东天瑞重工有限公司 | Anti-surge pressure-maintaining control method and system for magnetic suspension blower |
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| CN111075749B (en) | 2022-03-29 |
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