CN108180602A - A kind of intelligent frequency-conversion switch board and its control method - Google Patents
A kind of intelligent frequency-conversion switch board and its control method Download PDFInfo
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- CN108180602A CN108180602A CN201711442162.0A CN201711442162A CN108180602A CN 108180602 A CN108180602 A CN 108180602A CN 201711442162 A CN201711442162 A CN 201711442162A CN 108180602 A CN108180602 A CN 108180602A
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Abstract
The invention discloses a kind of intelligent frequency-conversion switch boards, including controlling cabinet, and the DDC controllers in cabinet, frequency converter, soft strater, contactor, operation display panel, intelligent electric meter and radiating module, the operation display panel is equipped with manual start-stop button, frequency conversion/power frequency, local/remote selects knob, pass through these buttons, knob controls DDC controllers and then control contactor, frequency converter and soft strater, each sensor that the DDC controllers pass through sensor interface connection scene, DDC controllers are also connect by communication cable with network controller simultaneously, the operation data of intelligent frequency-conversion switch board is uploaded to long-range host computer, it can be in remotely easily supervisory control system running.The present invention also has the function of that Neng imitates Jian Ce ﹑ moving of Zi Kong ﹑ Energy Saving Controls and Tiao Jie ﹑ energy safety monitoring and alarm other than the basic performance with general control cabinet.
Description
Technical field
The present invention relates to the energy and energy-saving control technology field, and in particular to a kind of intelligent frequency-conversion switch board and its controlling party
Method；Belong to the water circulating pump and Fan Equipment in ventilation and air conditioning system, the water circulating pump of heating system, life and fire demand water
The equipment such as pump carry out the design of intellectually and automatically energy-saving and frequency-variable control.
Background technology
Chinese society rapid development of economy, China's electricity consumption and supply of electric power demand remain high.According to statistics,
For national maximum air conditioning load up to 2.3 hundred million kilowatts, summer air conditioning load accounts for the 30%-40% of peakload, Beijing, Shanghai, Guangzhou,
The key cities such as Nanjing are even up to 50%.Energy-saving, improving energy efficiency improves environment trend of the times.
Ventilation and air conditioning system relies primarily on manual operation and management at present.Water circulating pump in air conditioner control system and
The equipment such as wind turbine are mostly operated in power frequency state, and operating personnel are according to previous operating experience, supply and return water temperature and pressure and other parameters
To determine the operation number of units of the equipment such as host, water pump and blower fan of cooling tower, manually complete the start and stop of unit and add Control of decreasing load having
Even if wind turbine and water pump installed frequency converter additional and by manually setting fixed running frequency, can not real adaptive system
Running environment, it is difficult to which the thorough influence for considering many factors, the energy consumption of ventilation and air conditioning system inevitably bring many wastes.
Operations staff's muscle power and mental burden weight, administrative staff cannot pass through Computer display, record and storage device operating parameter, nothing
Method such as is counted, is analyzed at the management works.More importantly ventilation and air conditioning system is more complicated, and safety and reliability requirement is high,
People is depended alone to monitor and operate, easily causes safety accident due to maloperation.
Invention content
It is an object of the invention to overcome above-mentioned the deficiencies in the prior art, a kind of novel ventilation air-conditioning intelligent frequency-conversion control is provided
System and its control method.
To achieve the above object, one of technical solution of the invention taken is：
A kind of intelligent frequency-conversion switch board, including control cabinet and DDC controllers in switch board body, frequency converter, soft
Starter, contactor, operation display panel, intelligent electric meter and radiating module, the frequency converter, soft strater, contactor, operation
Display panel, intelligent electric meter are connect by communication cable with the DDC controllers respectively, and the intelligent electric meter, frequency converter are used for
Electricity Liu ﹑ electricity Ya ﹑ Pin Shuai ﹑ power factors, the energy consumption parameter in each circuit are sent to DDC controllers, on the operation display panel
Manual start-stop button equipped with every water pump, frequency conversion/power frequency, local/remote selection knob, is controlled by these buttons, knob
DDC controllers and then control contactor processed, frequency converter and soft strater, the DDC controllers are connected existing by sensor interface
Each sensor of field, while DDC controllers are also connect by communication cable with network controller, and will intelligence by Ethernet
The operation data of frequency-conversion control cabinet is uploaded to long-range host computer, can be in remotely easily supervisory control system running.
Further, the spot sensor signal of detection is sent to DDC controllers, spot sensor letter by the sensor
Number include system water supply temperature signal, return water temperature signal, supply backwater temperature difference signal, pressure of supply water signal, pressure of return water signal,
For return water pressure difference signal, streamflow regime and electric butterfly valve quantity of state, wind pressure or wind speed etc..
Further, the intelligent frequency-conversion switch board can connect N platform water pumps according to actual conditions, wherein a frequency converter connects
Connect a pump variable frequency operation, remaining water pump connection soft strater power frequency operation；DDC controllers are adopted according to intelligent frequency-conversion switch board
After each item data of system of collection carries out comprehensive descision, analysis and calculating, the frequency conversion, power frequency start and stop and frequency conversion frequency modulation of water pump are controlled,
To realize system optimal energy-saving effect.
Since the water pump in ventilation and air conditioning system is typically all by maximum load and increases certain surplus design, and reality exists
At most only more than ten days or even more than ten a hours are run in 1 year, under full load, almost most time loads 70% with
Lower operation, causes the waste of mass energy.Increase frequency converter timing in the controls, pump rotary speed can be greatly improved
Control accuracy makes water pump be run under most energy-efficient rotating speed.According to fluid mechanics principle, the cube of shaft power and rotating speed is into just
Than, flow is directly proportional to rotating speed, when system load declines, required water flow is reduced, and pump rotary speed reduces
When, power presses the third-order drop of rotating speed.Therefore, the energy-saving effect of accurate speed governing is considerable.In actual operation, it is lightly loaded
The time proportion of operation is very high, using frequency converter timing, is greatly improved working efficiency during light running.
Further, intelligent frequency-conversion switch board controls the water pump of air-conditioning system by the way of constant difference variable-flow
System, the normal work temperature difference of as needed or practical experience setting water system, when air-conditioning actual load is reduced, water system confession,
Backwater temperature difference can become smaller, after DDC controllers detect the variation of the temperature difference, after PID arithmetic control frequency converter output frequency with
Reduction, reduce pump rotary speed, water supply flow is reduced, and makes to supply, backwater temperature difference increases and tends to setting value again；Conversely, work as
When air-conditioning actual load increases, water system supplies, backwater temperature difference can become larger, after DDC controllers detect the variation of the temperature difference, through PID
Increase frequency converter running frequency after operation, and then increase water flow, to meet the needs of load；Starting mode of pump sequence be：First become
Frequency starts a water pump, when frequency converter running frequency has exceeded the upper limiting frequency of setting, still cannot meet the flow need of system
It asks, then loads main frequency water pump all the way；The sequence of stopping is：When frequency converter running frequency fall below setting lower frequency limit operation,
Stop power frequency circuit all the way.
Further, the DDC controllers include first interface and second interface, and the first interface is standard
LonWorks interfaces, the second interface are analog interface, and the intelligent electric meter, frequency converter, network controller pass through standard
LonWorks interfaces connect DDC controllers；Spot sensor, soft strater, contactor connect DDC controls by analog interface
Device.
The technical solution that the present invention takes second is that：
A kind of control method of intelligent frequency-conversion switch board, the operation display panel in the frequency-conversion control cabinet are equipped with every water pump
Manual start-stop button and frequency conversion/power frequency, local/remote selection knob；
When local/remote selection knob is screwed into remote status, control loop is switched to remote auto working condition, intelligent frequency-conversion
Switch board can be automatically controlled by DDC controllers；After intelligent frequency-conversion switch board receives system enabled instruction：
（1）First start a frequency conversion pump operation, system detectio passes in and out the temperature difference on supply mains, compared with setting the temperature difference, by DDC
Control signal is exported to frequency converter after controller operation, adjusts the rotating speed of water pump so as to control water flow；When water needed for system
When flow is less than a discharge of pump, control system makes a pump variable frequency adjustment operation according to the variation of water requirement, when need
The temperature difference increase on supply mains is passed in and out during water increase, at this moment the signal detected is sent to DDC controllers by temperature sensor,
Judged by DDC operations, issue instructions to frequency converter, increase frequency converter running frequency control pump motor, make faster rotational speed with
The guarantee system temperature difference is constant, otherwise when water requirement is reduced, reducing frequency converter running frequency slows down pump rotary speed, to keep permanent
The temperature difference；
（2）When frequency converter running frequency has exceeded the upper limiting frequency of setting, First pump is switched to power frequency operation, and second pump becomes
Frequency, which starts, to be run and adjusts frequency, when second pump variable frequency frequency has exceeded the upper limiting frequency of setting, second pump switching
To power frequency operation, third platform pump frequency conversion, which starts, to be run and adjusts frequency, and so on；When frequency converter running frequency falls below setting
Lower frequency limit operation, stop a general pump, raise simultaneously converting operation frequency, stop the output after power frequency all the way to make up
It reduces, during whole service, remains that system constant difference is constant, water pump is made to always work in high efficient district；
When local/remote knob is screwed into local state, control loop is switched to local working condition, and intelligent frequency-conversion switch board can
It is run by operator in local manual control system, operation is as follows：
（1）One water pump is selected by manual knob in electric cabinet panel in advance and is used as frequency conversion pump operation, this water pump can pass through change
The button of frequency device control panel, manual start-up and shut-down control and frequency modulation control；
（2）Remaining water pump connects power frequency circuit, can pressing by intelligent frequency-conversion switch board operation display panel as power frequency pump operation
Button controls start and stop manually.
Further, in remote status, for more pumping systems, DDC controllers can calculate every pump operation time,
Preferential Load and execution time short water pump during loading, off-load preferentially subtract the water pump of long operational time, realize time in turn control.
Further, when system breaks down, failure can be recorded by system and be shown in operation display panel and
On host computer, trouble point and fault type is accurately positioned；When certain water pump breaks down, failure pump is can skip, operation is next
The normal water pump of platform；When frequency converter breaks down, it can switch to power frequency and continue normal operation；When DDC controllers or communication line
During failure, local manual work state is can switch to, continues normal operation.
Beneficial effects of the present invention are as follows：
（1）It can realize and intelligent frequency-conversion Energy Saving Control is carried out to circulating pump, wind turbine, heating cycle water pump.Intelligence becomes
Frequency switch board uses tandem variable-flow fuzzy control strategy, considers system（Including refrigeration machine, cooling water pump, cooling tower etc.）
Energy consumption realizes system optimal Energy Saving Control.
（2）It can realize and carry out that automatic switching plus-minus carries and time in turn is controlled to water circulating pump, without frequent starting water pump,
System control is stablized.
（3）It can realize to System Fault Tolerance function.Intelligent frequency-conversion switch board manual/auto can switch, power frequency/frequency conversion switching,
Even if certain water pump breaks down, frequency converter breaks down or DDC controllers break down, the normal work of whole system also can guarantee
Make, it is ensured that safe operation.
（4）It can realize complete and comprehensive electric prospection：The protections such as input phase failure, overcurrent, overload, overheat.Have emergency stop by
Key can cope with emergency.
（5）There are two types of interfaces：Standard LonWorks communication interfaces and analog interface can realize host computer remote control and more
Platform intelligent frequency-conversion switch board is run simultaneously.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description
It obtains significantly or is recognized by the practice of the present invention.
Description of the drawings
Fig. 1 is the frame diagram of patent of the present invention.
Fig. 2 is the control flow chart of the present invention.
Specific embodiment
Goal of the invention, technical solution and advantage to make patent of the present invention is clearer, below in conjunction with attached drawing to this hair
The embodiment of bright patent is described in further detail.
As shown in Figure 1, a kind of intelligent frequency-conversion switch board, including control cabinet and the DDC controllers being installed in switch board,
Frequency converter, soft strater, contactor, operation display panel（Including intelligent electric meter）And radiating module.DDC controller collection sites
Sensor information（System water supply temperature, return water temperature, supply backwater temperature difference, pressure of supply water, pressure of return water, for return water pressure difference, water
Stream mode and electric butterfly valve quantity of state etc.）, after then these data Jin row Fen Xi ﹑ are judged and calculated, to frequency converter, soft start
The intelligence component such as device, contactor sends out corresponding control instruction, to realize the intelligent control to each component.It and can be according to visitor
Family needs some states and data to be shown and analyzed on operation display panel and host computer.
DDC controllers include first interface and second interface.First interface is standard LonWorks interfaces：1st, intelligence is connected
Can ammeter, it is monitoring three-phase voltage, electric current, active power, reactive power, requirement, power factor, frequency, humorous for measuring electric energy
The parameters such as wave.2nd, connect frequency converter, monitor the voltage of frequency converter, electric current, active power, reactive power, power factor, frequency,
The parameters such as harmonic wave.3rd, network controller is connected, some states and data are exchanged with host computer by network controller, in realization
The monitoring and alarm of position machine.Second interface is analog interface：1st, connect spot sensor, receive the temperature of fielded system, the temperature difference,
The information such as pressure, pressure difference.2nd, frequency converter is connected, controls start and stop and the speed of frequency converter, the status information of feedback inverter.3rd, even
Connect contactor, the state of contactor is fed back in the action of control contactor.
Radiating module prevents in cabinet electric elements due to the excessively high generation of temperature for radiating in the cabinet of intelligent frequency-conversion switch board
Failure.
As shown in Fig. 2, intelligent frequency-conversion switch board has local/remote function.When local/remote knob is screwed into remote status,
Control loop is switched to remote auto working condition, and intelligent frequency-conversion switch board can be automatically controlled by DDC controllers.When intelligent change
After frequency switch board receives system enabled instruction：
1st, first start a frequency conversion pump operation, system detectio passes in and out the temperature difference on supply mains, compared with setting the temperature difference, by DDC
Control signal is exported to frequency converter after controller operation, adjusts the rotating speed of water pump so as to control water flow.When water needed for system
When flow is less than a discharge of pump, control system makes a pump variable frequency adjustment operation according to the variation of water requirement, when need
The temperature difference increase on supply mains is passed in and out during water increase, at this moment the signal detected is sent to DDC controllers by temperature sensor,
Judged by DDC operations, issue instructions to frequency converter, increase frequency converter running frequency control pump motor, make faster rotational speed with
The guarantee system temperature difference is constant, otherwise when water requirement is reduced, reducing frequency converter running frequency slows down pump rotary speed, to keep permanent
The temperature difference.
2nd, when frequency converter running frequency has exceeded the upper limiting frequency of setting, First, which pumps, is switched to power frequency operation, second
Pump frequency conversion, which starts, to be run and adjusts frequency, when second pump variable frequency frequency has exceeded the upper limiting frequency of setting, second pump
Power frequency operation is switched to, third platform pump frequency conversion, which starts, to be run and adjusts frequency, and so on.When frequency converter running frequency is fallen below
The lower frequency limit operation of setting, stops a general pump, raises simultaneously converting operation frequency, is stopped all the way after power frequency with making up
Output is reduced, and during whole service, remains that system constant difference is constant, water pump is made to always work in high efficient district, was both protected
The card system temperature difference is constant, and saves electric energy.
3rd, for more pumping systems, DDC controllers can calculate every pump operation time, during loading during preferential load operating
Between short water pump, off-load preferentially subtracts the water pump of long operational time, realizes time in turn control, eliminate water pump and do not have to corrosion for a long time
Or situation severe using abrasion for a long time.
When local/remote knob is screwed into local state, control loop is switched to local working condition, intelligent frequency-conversion switch board
It can be run by operator in local manual control system.1st, one water pump is selected by manual knob in electric cabinet panel in advance
（1# is pumped or N# pumps）As frequency conversion pump operation, this pump can pass through the button of Frequency Converter Control panel, manual start-up and shut-down control and tune
Frequency controls.2nd, remaining water pump connects power frequency circuit, as power frequency pump operation, can pass through intelligent frequency-conversion switch board operation display panel
Button controls start and stop manually.
Intelligent frequency-conversion switch board has stronger fault tolerance, can be long-range（Automatically）Control, can be local（Manually）It controls, is variable
Frequency operation, can power frequency operation.When certain water pump breaks down, failure pump is can skip, runs next normal water pump；Work as frequency conversion
When device breaks down, it can switch to power frequency and continue normal operation；When DDC controllers or communication line break down, can be switched
To local manual work state, continue normal operation.It can ensure that water system is continuously run for a long time.
The major loop of intelligent frequency-conversion switch board is by breaker, frequency converter, soft strater, A.C. contactor and electrothermal relay group
Into can have overcurrent, overload and overheating protection to electric appliance in cabinet.There is scram button on cabinet operation panel, once urgent shape occurs
Condition presses scram button, can cut off control loop power supply, it is ensured that system safety.
The basic principles, main features and advantages of the invention have been shown and described above.Those of ordinary skill in the art
It should be appreciated that above-described embodiment protection domain that the invention is not limited in any way, all to be obtained using modes such as equivalent replacements
The technical solution obtained, falls in protection scope of the present invention.
Part that the present invention does not relate to is same as the prior art or the prior art can be used is realized.
Claims (8)
1. a kind of intelligent frequency-conversion switch board, including controlling cabinet, it is characterised in that further include the DDC controls in switch board body
Device processed, frequency converter, soft strater, contactor, operation display panel, intelligent electric meter and radiating module, the frequency converter, soft start
Device, contactor, operation display panel, intelligent electric meter are connect by communication cable with the DDC controllers respectively, the intelligence electricity
Table, frequency converter are used to send electricity Liu ﹑ electricity Ya ﹑ Pin Shuai ﹑ power factors, the energy consumption parameter in each circuit to DDC controllers, the behaviour
Make manual start-stop button of the display panel equipped with every water pump, frequency conversion/power frequency, local/remote selection knob are pressed by these
Button, knob control DDC controllers and then control contactor, frequency converter and soft strater, and the DDC controllers pass through sensor
Each sensor at interface connection scene, while DDC controllers are also connect by communication cable with network controller, and by with
Too the operation data of intelligent frequency-conversion switch board is uploaded to long-range host computer by net, can be in remotely easily supervisory control system running.
2. a kind of intelligent frequency-conversion switch board according to claim 1, it is characterised in that the sensor is by the scene of detection
Sensor signal is sent to DDC controllers, and spot sensor signal includes system water supply temperature signal, return water temperature signal, supplies
Backwater temperature difference signal, pressure of supply water signal, pressure of return water signal, for return water pressure difference signal, streamflow regime and electric butterfly valve state
Amount, wind pressure or wind speed.
3. a kind of intelligent frequency-conversion switch board according to claim 1, it is characterised in that the intelligent frequency-conversion switch board according to
Actual conditions can connect N platform water pumps, wherein a frequency converter connects a pump variable frequency operation, remaining water pump connection soft strater
Power frequency operation；DDC controllers carry out comprehensive descision, analysis and calculating according to each item data of system that intelligent frequency-conversion switch board acquires
Afterwards, the frequency conversion, power frequency start and stop and frequency conversion frequency modulation of water pump are controlled, to realize system optimal energy-saving effect.
4. a kind of intelligent frequency-conversion switch board according to claim 1, it is characterised in that intelligent frequency-conversion switch board uses constant temperature
The mode of poor variable-flow controls the water pump of air-conditioning system, the normal work of as needed or practical experience setting water system
The temperature difference, when air-conditioning actual load is reduced, water system supplies, backwater temperature difference can become smaller, and DDC controllers detect the variation of the temperature difference
Afterwards, the output frequency of frequency converter being controlled to decrease after PID arithmetic, reduces pump rotary speed, water supply flow is reduced, make to supply,
Backwater temperature difference increases and tends to setting value again；Conversely, when air-conditioning actual load increases, water system supplies, backwater temperature difference can become
Greatly, after DDC controllers detect the variation of the temperature difference, increase frequency converter running frequency after PID arithmetic, and then increase water flow,
To meet the needs of load；Starting mode of pump sequence be：First one water pump of variable frequency starting, when frequency converter running frequency has exceeded setting
Upper limiting frequency, still cannot meet the flow demand of system, then load main frequency water pump all the way；The sequence of stopping is：Work as frequency conversion
Device running frequency falls below the lower frequency limit operation of setting, stops power frequency circuit all the way.
5. a kind of intelligent frequency-conversion switch board according to claim 1, it is characterised in that the DDC controllers include first
Interface and second interface, the first interface be standard LonWorks interfaces, the second interface be analog interface, the intelligence
Ammeter, frequency converter, network controller connect DDC controllers by standard LonWorks interfaces；Spot sensor, soft strater,
Contactor connects DDC controllers by analog interface.
6. a kind of control method of intelligent frequency-conversion switch board, it is characterised in that set on the operation display panel in the frequency-conversion control cabinet
There are the manual start-stop button and frequency conversion/power frequency, local/remote selection knob of every water pump；
When local/remote selection knob is screwed into remote status, control loop is switched to remote auto working condition, intelligent frequency-conversion
Switch board can be automatically controlled by DDC controllers；After intelligent frequency-conversion switch board receives system enabled instruction：
（1）First start a frequency conversion pump operation, system detectio passes in and out the temperature difference on supply mains, compared with setting the temperature difference, by DDC
Control signal is exported to frequency converter after controller operation, adjusts the rotating speed of water pump so as to control water flow；When water needed for system
When flow is less than a discharge of pump, control system makes a pump variable frequency adjustment operation according to the variation of water requirement, when need
The temperature difference increase on supply mains is passed in and out during water increase, at this moment the signal detected is sent to DDC controllers by temperature sensor,
Judged by DDC operations, issue instructions to frequency converter, increase frequency converter running frequency control pump motor, make faster rotational speed with
The guarantee system temperature difference is constant, otherwise when water requirement is reduced, reducing frequency converter running frequency slows down pump rotary speed, to keep permanent
The temperature difference；
（2）When frequency converter running frequency has exceeded the upper limiting frequency of setting, First pump is switched to power frequency operation, and second pump becomes
Frequency, which starts, to be run and adjusts frequency, when second pump variable frequency frequency has exceeded the upper limiting frequency of setting, second pump switching
To power frequency operation, third platform pump frequency conversion, which starts, to be run and adjusts frequency, and so on；When frequency converter running frequency falls below setting
Lower frequency limit operation, stop a general pump, raise simultaneously converting operation frequency, stop the output after power frequency all the way to make up
It reduces, during whole service, remains that system constant difference is constant, water pump is made to always work in high efficient district；
When local/remote knob is screwed into local state, control loop is switched to local working condition, and intelligent frequency-conversion switch board can
It is run by operator in local manual control system, operation is as follows：
（1）One water pump is selected by manual knob in electric cabinet panel in advance and is used as frequency conversion pump operation, this water pump can pass through change
The button of frequency device control panel, manual start-up and shut-down control and frequency modulation control；
（2）Remaining water pump connects power frequency circuit, can pressing by intelligent frequency-conversion switch board operation display panel as power frequency pump operation
Button controls start and stop manually.
7. a kind of control method of intelligent frequency-conversion switch board according to claim 6, it is characterised in that in remote status,
For more pumping systems, DDC controllers can calculate every pump operation time, preferential Load and execution time short water during loading
Pump, off-load preferentially subtract the water pump of long operational time, realize time in turn control.
8. the control method of a kind of intelligent frequency-conversion switch board according to claim 6, it is characterised in that when event occurs in system
During barrier, failure can be recorded by system and is shown on operation display panel and host computer, and trouble point and failure is accurately positioned
Type；When certain water pump breaks down, failure pump is can skip, runs next normal water pump；When frequency converter breaks down,
It can switch to power frequency and continue normal operation；When DDC controllers or communication line break down, local manual work can switch to
State continues normal operation.
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Cited By (6)
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| CN110044035A (en) * | 2019-05-16 | 2019-07-23 | 珠海格力电器股份有限公司 | Variable frequency air-conditioner controller fault tolerable circuit and control method |
| CN111256202A (en) * | 2020-01-19 | 2020-06-09 | 深圳市奥宇节能技术股份有限公司 | Group control method for heat source hot side variable frequency circulating pump of central heating system |
| CN111338279A (en) * | 2020-03-05 | 2020-06-26 | 浙江倚天智能科技有限公司 | Intelligent variable frequency control cabinet |
| CN113323887A (en) * | 2021-06-01 | 2021-08-31 | 广州大学城投资经营管理有限公司 | Energy-saving device for water pump system of central air conditioner |
| CN113448295A (en) * | 2021-05-14 | 2021-09-28 | 郑州旭飞光电科技有限公司 | Method for switching induced draft fan, processor and storage medium |
| CN113669257A (en) * | 2021-09-22 | 2021-11-19 | 上海斯可络压缩机有限公司 | Vortex machine increases worker frequency conversion integral type control system |
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| CN111338279A (en) * | 2020-03-05 | 2020-06-26 | 浙江倚天智能科技有限公司 | Intelligent variable frequency control cabinet |
| CN113448295A (en) * | 2021-05-14 | 2021-09-28 | 郑州旭飞光电科技有限公司 | Method for switching induced draft fan, processor and storage medium |
| CN113323887A (en) * | 2021-06-01 | 2021-08-31 | 广州大学城投资经营管理有限公司 | Energy-saving device for water pump system of central air conditioner |
| CN113669257A (en) * | 2021-09-22 | 2021-11-19 | 上海斯可络压缩机有限公司 | Vortex machine increases worker frequency conversion integral type control system |
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Application publication date: 20180619 |