38results about How to "Prevent surge" patented technology

The invention provides a cloud computer integrated storage method and device, electronic equipment, a chip and a medium, and the method comprises the steps: determining the prediction time when the usage amount of a local storage space exceeds a preset threshold value based on local storage data, and enabling the prediction time to be obtained through the prediction of a trained target prediction model; according to the storage information configuration file, a target cloud storage space is determined from at least one cloud storage space contained in the storage information configuration file, and the cloud storage space is used for the cloud application to store data; before the prediction time, mounting the target cloud storage space to a local mounting point; and uploading the file written into the local mounting point to the target cloud storage space. According to the invention, the cloud storage space of other cloud applications can be integrated to the local cloud computer client, the integrated storage of the cloud computer client and the cloud storage space is realized, the utilization rate of the storage space is improved, elastic capacity expansion can be realized according to requirements through automatic mounting, the user experience is improved, and the capacity expansion efficiency is improved.

The invention discloses an operation training method and system for a cold compression unit, and is applied to the field of system simulation, and the method comprises the steps: building a simulation model of the cold compression unit, compiling the simulation model, and generating a deck platform; based on the deck platform, packaging the simulation model into a compilable C + + file; compiling the C + + file by using a C + + program to generate an executable file, running the simulation model to obtain a running result, and storing the running result in an SQL database; and acquiring operation data of the simulation model in the SQL database through a control system of the PLC, and performing data interaction with the simulation model.

The present invention discloses a magnetic levitation centrifugal compressor, which belongs to the field of compressor equipment, including a magnetic levitation motor assembly, wherein an interpolar cooling device is connected between a primary volute and a secondary volute at both ends of the magnetic levitation motor assembly through a first air pipe and a second air pipe; the air inlet diameter of the first air pipe is the same as the air outlet diameter of the second air pipe. The air inlet diameter of the first air pipe and the air outlet diameter of the second air pipe are the same or as close as possible to minimize noise reduction, and the interpolar cooling device of the first air pipe and the second air pipe can cool the air compressed for the first time, which can effectively reduce the temperature of the compressed air, thereby reducing the pressure of the gas flowing into the second air pipe, and can also effectively reduce the pressure difference between the intake air pressure and the exhaust air pressure, which is beneficial to noise reduction. In addition, the present invention has lower energy consumption, high air filtration accuracy, and a balanced structure of the internal rotating shaft of the compressor, which can reach a higher rotation speed, and better gas compression effect and product quality.

A robust control method for an aero-engine starting control plan comprises the steps that in the engine starting process of an aero-engine, according to a control program of a first redundancy fuel control plan, an acceleration fuel flow target # imgabs0 # is obtained at the current moment j, and an acceleration fuel flow fusion target # imgabs1 # at the previous moment j-1 is obtained; a fusion coefficient # imgabs2 # at the current moment is obtained through weighted calculation, and then a weight # imgabs5 # is obtained through calculation according to the fuel oil deviation # imgabs3 # of the fuel oil control plan and the acceleration deviation # imgabs4 # of the second conversion acceleration control plan; inputting # imgabs6 # into Proportional-integra control to output accelerated fuel flow at the current moment j, fusing the accelerated fuel flow with # imgabs7 #, obtaining a steady-state fuel flow target # imgabs8 # at the current moment j according to a control program of a third steady-state fuel control plan, and taking a minimum value of the accelerated fuel flow target # imgabs8 # and the steady-state fuel flow target # imgabs9 # to obtain a final fuel flow target # imgabs9 # of the starting control plan.

The invention belongs to the technical field of gas stoves, and provides a gas stove and a control method thereof.The gas stove comprises a control module, a gas flow collecting module and a connecting module, the gas flow collecting module is arranged on a gas inlet pipeline of the gas stove, the gas stove comprises a burner, and a K-type thermocouple is arranged on the burner; the control module dynamically controls the connecting module to send an adjusting instruction to adjust the smoke suction speed of the range hood; according to the gas stove, sufficient combustion can be guaranteed, exhaust gas can be reduced to take away heat, the linked gas can generate matched flames, the appropriate fuel-air ratio is generated, the heat efficiency of the stove is improved, waste of the gas of the gas stove is directly reduced, the gas is saved, surge of a range hood is avoided, and oil smoke gas pressure difference imbalance is reduced; the problem of lampblack backflow is avoided.

The present invention provides a partition structure and an air conditioner indoor unit having the same. The partition structure is used to be arranged in the air duct of the air conditioner indoor unit, and the partition structure includes: a partition body, which is used to be connected to the shell of the air conditioner indoor unit; at least one air duct partition plate, which is arranged on the partition body; along the first extension direction of the air duct, at least one air duct partition plate divides the air duct into at least two air duct sections, so that the airflow entering the air duct flows out after passing through at least two air duct sections respectively. The partition structure of the present invention solves the problem of scattered wind direction of the air duct of the air conditioner indoor unit in the prior art.

The invention belongs to the technical field of cast-in-place pile hole collapse prevention, and particularly relates to a silt layer self-balancing hole collapse prevention cast-in-place pile structure which comprises a reinforcement cage and a pile casing, the pile casing is detachably installed at an opening of a cast-in-place pile hole, and the reinforcement cage penetrates through an inner cavity of the pile casing and makes contact with the bottom of the inner cavity of the cast-in-place pile hole. The fixing part is detachably mounted at the top of the reinforcement cage, and the top of the reinforcement cage mounted closest to an opening of a cast-in-place pile hole can be continuously pressed through the fixing part; the adjusting part is arranged outside the fixing part, and the position of the reinforcement cage can be adjusted in time through the adjusting part, so that the central axis of the reinforcement cage coincides with the central axis of the cast-in-place pile hole all the time. According to the concrete foundation pile, through mutual cooperation of the parts, stirrup deformation and main reinforcement bending of the reinforcement cage caused by collapse of a silt layer during concrete pouring can be avoided, the bearing capacity of the built concrete foundation pile is guaranteed, and meanwhile the influence on lifting of the guide pipe and normal construction of a cast-in-place pile hole is avoided.

The invention relates to a semiconductor device, an amplifier and a bias circuit. A semiconductor device includes a first transistor, a second transistor, and a third transistor. The first transistor is controlled by a first switching signal for turning on during a first enable period. The second transistor is controlled by a second switching signal for turning on at least during a second enable period. The first enabling time period comprises a first delay time period, a second enabling time period and a second delay time period which are arranged in sequence. The third transistor is controlled by a third switching signal for conducting at least during a third enable period. The second transistor is coupled between the first transistor and the third transistor. The second enabling time period comprises a third delay time period, a third enabling time period and a fourth delay time period which are arranged in sequence.

The present invention relates to the field of cold water system regulation, and provides a frequency converter controlled chiller energy-saving system and method, including: an air supply unit, a hydrogen compressor, a first cold water unit, a second cold water unit, a heat exchanger, a hydrogenator, a venting unit and a hydrogenation vehicle; the air supply unit is connected to the hydrogen compressor, the hydrogen compressor is connected to the first cold water unit, the hydrogen compressor is connected to the venting unit, the hydrogen compressor is connected to the heat exchanger, the heat exchanger is connected to the second cold water unit, the heat exchanger is connected to the hydrogenator, the hydrogenator is connected to the hydrogenation vehicle, and the hydrogenator is connected to the venting unit. The present invention adjusts the power of the chiller according to the water temperature difference between the water inlet and the water outlet of the chiller, and the load range of the guide vane, so that the start-up and operation of the chiller have obvious energy-saving effects; the frequency converter is used to drive the chiller, which improves the operating performance of the chiller, prevents surge, and enhances the flexibility of operation regulation.

The invention relates to the technical field of magnetic suspension phase change air conditioners, in particular to a load matching control method for an evaporative cooling magnetic suspension phase change air conditioner, which comprises the following steps: acquiring outdoor wet bulb temperature and system refrigeration load, and comparing with a preset threshold to start different working modes; whether refrigeration output is matched with the requirement or not is judged by comparing the actual temperature with a temperature threshold value in different working modes; if not, calculating the initial adjusting quantity of the key component according to the temperature difference; the current of the key component is sampled in real time, the mutation rate is calculated and compared with a threshold value, the initial adjusting quantity is corrected according to a comparison result, and therefore adjustment and control over all the components are completed. According to the method, multi-dimensional fusion and self-adaptive matching of the load demand, the environmental condition and the equipment state are realized, and the operation risk caused by too fast adjustment or equipment abnormity is effectively avoided while the energy efficiency of the system is improved.

The utility model relates to the technical field of signal terminal assemblies, specifically provides a signal terminal assembly, a connector, an electronic component and a vehicle, and aims to solve the problem of short circuit to ground caused by breakdown of a TVS (Transient Voltage Suppressor) by partial higher-voltage surges in the prior art. In order to achieve the purpose, the signal terminal assembly comprises a signal terminal, a plurality of contact pieces and a buffer resistor, and the plurality of contact pieces are sequentially arranged on the outer side of the signal terminal and electrically connected with the signal terminal; at least one buffer resistor is arranged between the contact piece and the signal terminal; the larger the distance between the contact piece and the signal terminal is, the larger the resistance between the contact piece and the signal terminal is. When a butt joint connector is in hot plug connection with the signal terminal assembly, due to the fact that the butt joint connector is firstly in contact with high resistance impedance, electric potential difference cannot be instantly conducted to form surge, surge is avoided, components connected with the butt joint connector and the connector respectively are protected, and a chip can be protected.

The invention provides a hybrid vehicle and a control method of the hybrid vehicle. The hybrid vehicle and the control method of the hybrid vehicle can suppress increase of calculation amount, prevent surge and maintain operation performance. This hybrid vehicle is provided with: a first determination unit that determines the surge state of a turbocharger on the basis of the state of an engine; a second determination unit that determines the surge state of the turbocharger on the basis of the state of the turbocharger; and a control unit that controls the engine and the assist of the electric drive motor to the engine on the basis of the determination results of the first determination unit and the second determination unit.

The invention belongs to the technical field of electric power metallurgy automatic control, and provides an annealing furnace combustion-supporting air supply system automatic control method which comprises the steps that a temperature detection element is arranged on an outlet pipeline of a combustion-supporting fan, the temperature of combustion-supporting air is detected in real time, and the optimal rotation speed of the combustion-supporting fan is automatically matched through piecewise linear control according to different combustion-supporting air temperatures on site. On the basis of the optimal rotating speed of the combustion-supporting fan, feedforward control is matched with a PID feedback control algorithm to control the opening degree of an outlet blow-off valve of the combustion-supporting fan so as to adjust the actual combustion-supporting air pressure value; according to the method, a combustion-supporting air temperature detection loop and a piecewise linear control module are added, and automatic matching and giving of the optimal fan rotating speed are achieved. The opening control mode of the blow-off valve is optimized, feed-forward control and PID control are combined, and the pressure stability is improved.

The application discloses a kind of power grid phase different no impact intelligent switching method and device, device includes H bridge circuit, and the midpoint of left, right half bridge is connected corresponding phase line and neutral line by LC filter circuit, and left, right half bridge both ends are connected load after supporting capacitor in parallel, method includes: calculating three-phase voltage unbalance degree;Unbalance degree exceeds the moment of threshold value is decision moment, according to load current, voltage time series data calculation load equivalent impedance, according to load equivalent impedance and decision moment phase voltage and load voltage calculation each phase impact cost, with impact cost minimum phase as target phase;Double-loop control is carried out to target phase H bridge circuit, so that its output voltage tracks decision moment load voltage, if the difference of both is less than the time that safety threshold value meets requirement, after closing the static switch of target phase, control target phase H bridge circuit output voltage transition to target phase real voltage, and shut off the static switch of original phase.The application realizes the truly no impact switching of sensitive load.

This invention relates to the field of centrifugal fan technology, and particularly to a high-pressure centrifugal fan with backward-curved blades. The fan includes a volute, an impeller, and a collector. Both the impeller and the collector are housed within the volute, and the collector is fixedly connected to the volute. The impeller includes a front plate and a rear plate. Multiple blades are arranged in an array around the rear plate. An air intake is located in the center of the front plate. The blades are of a single-plate straight structure, each blade including a leading edge, a trailing edge, a first side connecting the first end of the leading edge and the first end of the trailing edge, and a second side connecting the second end of the leading edge and the second end of the trailing edge. The first side is the side closest to the air intake, and the second side is the side furthest from the air intake. The leading edge includes an arc segment near the air intake and a straight segment away from the air intake. The trailing edge is a straight segment. Both the straight leading edge and the trailing edge are parallel to the impeller hub, and the second side is perpendicular to the impeller hub. This high-pressure centrifugal fan has a larger flow rate and higher pressure.

The invention relates to an intelligent control gas engine pressurization system which comprises a cylinder cover, an engine gas inlet pipe, an exhaust manifold, a pressurization module, an intercooler, an intelligent control module and a pipeline. An engine air inlet pipe is installed on one side of the cylinder cover, and an exhaust manifold is installed on the other side of the cylinder cover. The pressurization module is arranged on the installation side of the exhaust manifold and communicates with the exhaust manifold through a pipeline. The air inlet side of the pressurization module communicates with the intercooler through a pipeline. The intercooler is communicated with an engine air inlet pipe through a pipeline; the intelligent control module is in electric signal coupling with an intelligent control assembly arranged on the pipeline through a signal line. The invention further relates to an intelligent control gas engine pressurization method using the intelligent control gas engine pressurization system. The air inlet efficiency is improved, the engine power is improved, and the gas consumption of the engine is reduced; surging of the supercharger is prevented; the control precision and the system response efficiency are improved, and the customer satisfaction is improved.

The invention relates to the technical field of air conditioners, in particular to a fresh air module and an air conditioner, and the fresh air module comprises a fan assembly and a shell. An air inlet cavity is formed in the shell, and a first air inlet communicating with the air inlet cavity is formed in the shell; the fan assembly is connected with the shell, a second air inlet and an air outlet are formed in the fan assembly, and the second air inlet communicates with the air inlet cavity; a bypass cavity is defined by the shell and the fan assembly, and a first backflow inlet and a first backflow outlet are formed in the bypass cavity; the first backflow inlet communicates with the air outlet, and the first backflow outlet communicates with the air inlet cavity. The fan assembly generates suction force to suck the fresh air flow into the air inlet cavity through the first air inlet and then exhaust the fresh air flow through the air outlet, and part of the fresh air flow exhausted from the air outlet can flow back into the air inlet cavity again through the bypass cavity, so that the total air inlet amount entering the fan assembly is increased, surge of the wind wheel is avoided, and user experience is optimized.

The utility model relates to vehicle engineering technical field provides a kind of anti-surge valve, drive assembly and vehicle.The first air inlet of shell is used to connect with the downstream pipeline of throttle valve, the second air inlet is used to connect with the upstream pipeline of throttle valve;First regulating assembly is used to adjust the communication and block of first air inlet and first air chamber, if the pressure value of first fluid from first air inlet to first air chamber is greater than first preset pressure value, first air inlet and first air chamber are communicated;Second regulating assembly is used to adjust the communication and block of first air inlet and exhaust port, if the pressure value of first fluid is greater than the sum of the pressure value of second fluid entering first air chamber from second air inlet and second preset pressure value, first air inlet and exhaust port are communicated.Such, by judging the load state of engine first and then judging whether it needs to be relieved, can avoid surge, and keep the stability of engine performance under small load.

The present invention belongs to the technical field of refrigeration equipment, and specifically provides a control method for preventing surge of a cold storage host of a cold storage air-conditioning system, including obtaining historical operation data of the cold storage system, the historical operation data including time points when surge occurred in several cold storage systems, extracting time points when surge occurred in several cold storage systems for preprocessing, and inputting them into a trained model, integrating the time points into surge occurrence time periods through the trained model, and marking them as key time periods; obtaining real-time operation parameters of the cold storage system, and sending an adjustment signal to an adjustment module when the real-time time for obtaining the real-time operation parameters is within the marked key time period, sending the adjustment signal to the adjustment module, the adjustment module receiving the adjustment signal and sending a control signal to the cold storage host, and the adjustment module controlling the cold storage host in operation to transfer load to the cold storage host in non-operation, so as to avoid surge caused by unstable operation of the compressor.

The invention discloses a method for removing H-shaped steel in a range of a rectangular jacking pipe starting portal, which comprises the following steps of: 1) increasing the diameter and the depth of a cement-soil mixing pile during construction of a starting well enclosure structure; (2) before the pipe jacking is started, tunnel portal water exploration is conducted; (3) the distance between the pipe jacking machine and the starting tunnel portal is adjusted, and a working face and a leaking stoppage working space are formed in the tunnel portal; (4) preparing double-liquid slurry and grouting equipment and grouting pipes thereof; 5) pulling out the H-shaped steel; (6) fixing; and (7) the pipe jacking machine starts to enter the hole. The H-shaped steel is removed through a pulling-out method, time can be saved, efficiency can be improved, and it is guaranteed that the pipe jacking machine can be started rapidly. And meanwhile, the whole section steel can be completely recycled without leaving, so that materials can be saved. In addition, the stability of soil on the tunnel face of the tunnel portal is not damaged when the profile steel is pulled out, and construction safety can be guaranteed. In addition, double-liquid slurry is injected into the gap after the profile steel is pulled out, underground water can be rapidly sealed, sudden gushing of the foundation pit is prevented, and construction safety is guaranteed.

According to the fault-tolerant control method for the acceleration control plan of the aero-engine, in the engine acceleration process of the aero-engine, an acceleration fuel flow target obtained at the current moment j and an acceleration fuel flow at the previous moment j-1 are fused and output according to a control program of the ith acceleration control plan, the total variance of the current moment is obtained through weighted calculation, and then the total variance of each acceleration control plan is used for calculation to obtain a weight; calculating the statistical variance of various planned fuels at the current moment; calculating a new weighted average relative fuel quantity in combination with the posterior probability and the semi-variance until the relative error of the weighted average relative fuel quantities before and after iteration is smaller than a set maximum error; and finally, taking the product of the terminated weighted average relative fuel quantity and the accelerated fuel flow fusion output as the accelerated fuel flow fusion output at the current moment.

The present application relates to coal seam permeability enhancement technical field, and disclose a kind of hydraulic mechanical cavitation device for coal seam permeability enhancement and use method, comprising: rack, the rack is slidably installed with step module, hydraulic machine is slidably installed on the step module;The output end of the hydraulic machine is threadedly connected with first drill rod, the first drill rod is threadedly connected with second drill rod at one end away from the hydraulic machine, and drill-in assembly is connected at the end of the second drill rod away from the first drill rod;Expanding hole assembly is arranged in the second drill rod.By the cooperation of drill-in assembly and driving mechanism, drill bit can be drilled by mechanical impact, and the technical effect of permeability enhancement and cavitation is achieved.Compared with high-pressure water driving technology, the use of mechanical impact has the advantages of accurate control and stable operation, and also avoids the gas gushing, hole plugging and equipment hazards existing in hydraulic permeability enhancement.

The invention relates to a semiconductor device, an amplifier and a bias circuit. A semiconductor device includes a first transistor and a second transistor. The first transistor is used for conducting in a first enabling period. The second transistor is used for being turned on in a second enabling period. The first transistor is coupled in series with the second transistor. The first enabling time period comprises a first delay time period, a second enabling time period and a second delay time period which are arranged in sequence.

The application discloses a magnetic suspension micro gas turbine power station and a control method thereof, and belongs to the technical field of micro gas turbine power generation. The magnetic suspension micro gas turbine power station comprises a micro gas turbine, a magnetic suspension motor and an electronic control system. The micro gas turbine is one of a type without a regenerator, a type with a built-in regenerator or a type with an external regenerator. The air inlet of the centrifugal compressor of the micro gas turbine is arranged in the magnetic suspension motor, and the motor stator is fixed in the air inlet. The centrifugal compressor and the radial turbine are back-to-back arranged on the rotating shaft, the radial turbine is fixed on the cantilever end of the rotating shaft and located outside the two radial magnetic bearings to form cantilever support, and the centrifugal compressor, the radial turbine, the motor rotor and the magnetic bearing rotor adopt a coaxial mounting structure. The application also adopts a double cooling gas path and a three-ring nested control strategy, and realizes high integration, oil-free, efficient cooling and precise dynamic control of the power station.

The present application relates to the technical field of electronic timer, especially to a low-power electronic timer wake-up system and method based on ambient light sensing, which comprises an ambient light sensing unit, a signal processing unit, a wake-up control unit, an electronic timer main control module and a power management module. The sensing unit works in an intermittent sampling mode with duty cycle dynamic configuration to output original photoelectric signals. The signal processing unit tracks the dynamic reference value of ambient light in real time based on a sliding time window difference algorithm, and decouples the light intensity change gradient and the reference deviation. The wake-up control unit builds a two-stage asymmetric verification architecture through a nano-level coarse sieve comparator and a fine verification state mechanism, and outputs the final wake-up enable signal combined with an adaptive weighted matching model. The present application solves the problems of high standby power consumption, susceptibility to ambient light interference and rough energy efficiency management of traditional wake-up circuits, and realizes nano-level ultra-low standby, high confidence wake-up and full-cycle energy efficiency optimization.

The present invention discloses a vehicle generator control method and related equipment, which relates to the field of vehicle generator control, and is mainly used to solve the problem that the vehicle energy is difficult to recharge through the battery under low temperature conditions, so there is a lack of a better method for controlling the energy consumption of the generator. The method includes: obtaining the battery temperature; when the battery temperature is lower than the preset temperature, obtaining the target power to be consumed sent by the power master controller to the generator, the target power to be consumed is determined based on the power required to consume the engine pressure to be released; based on the target power to be consumed, the vehicle generator is controlled to work to consume at least part of the target power to be consumed. The present invention is used for the vehicle generator control process.

The utility model belongs to the technical field of building and municipal construction, and particularly discloses a foundation pit corner enclosure and underground water control structure which comprises an underground diaphragm wall, a high-pressure jet grouting pile, an inclined strut and a dewatering well. The underground diaphragm wall is a surrounding wall body arranged on the periphery in the foundation pit, a wall bottom grouting pipe is arranged in the underground diaphragm wall, and a reserved grouting pipe is arranged at the position, located at the joint, outside the wall. The high-pressure jet grouting piles comprise corner inner high-pressure jet grouting piles and corner outer high-pressure jet grouting piles; the inclined strut comprises a triangular plate brace and an angle brace which are both mounted at the corner of the enclosing purlin, and the enclosing purlin is mounted on the inner circumference of the underground diaphragm wall; the multiple dewatering wells are arranged on the inner side of the corner inner high-pressure jet grouting pile and the outer side of the corner outer high-pressure jet grouting pile respectively. The problems of foundation pit corner deformation and underground water leakage are solved through a combined structure of triangular plate supports, angle supports, corner inner and outer high-pressure jet grouting pile reinforcement, dewatering, underground diaphragm wall seam reinforcement and wall bottom grouting.

The invention discloses a high-performance multi-stage axial-flow type air compression system and a using method, and the system comprises a compressor body, one end of which is connected with a motor through a gear box, and which comprises a compressor inlet and a compressor outlet; the single-row inlet adjustable guide vane is arranged in the compressor body; the air inlet pipeline is connected to an air inlet chamber of the compressor body; the interstage deflation pipeline is connected to the interstage deflation chamber of the compressor body and is provided with an interstage deflation valve; the exhaust emptying pipeline is connected to an outlet of the compressor body and is provided with an exhaust emptying valve; the exhaust air supply pipeline is connected to an outlet of the compressor body and is provided with an exhaust air supply valve; the efficiency and the pressure ratio of the air compression system can be improved.

The invention relates to the field of water resource purification, in particular to self-cleaning low-emission water purification equipment. The invention provides a self-cleaning low-emission water purification device. The self-cleaning low-emission water purification equipment comprises a water purification frame, a ceramic membrane water purification assembly, a water outlet pipe, a backwashing assembly, a water inlet, a self-cleaning mechanism, a silt removal mechanism and the like. Power is provided by the driving motor, so that the mounting frame can automatically move, and in the automatic movement process of the mounting frame, the cleaning roller can automatically rotate by virtue of the matching effect of the gear and the rack frame, so that the soft cleaning convex block is used for scraping and cleaning a filtering element of the ceramic membrane water purification assembly; the filter element of the ceramic membrane water purification assembly is prevented from being attached with impurities and affecting the water purification effect, the automatic cleaning effect is achieved, and the soft cleaning protruding blocks can also prevent the filter element of the ceramic membrane water purification assembly from being damaged in the cleaning process.

The invention relates to a structure and method for preventing surge of a magnetic suspension centrifugal blower, and relates to the technical field of centrifugal blowers, the structure comprises a fan installed in a cabinet, a diffuser pipe is arranged at the output end of the fan, and a pressure sensor is used for detecting the pressure at the outlet of the diffuser pipe; the side face of the diffuser pipe is communicated with an emptying branch, and an emptying valve is arranged on the emptying branch. A PLC control panel is installed on the side face of the machine cabinet, an anti-surge calculation module is arranged in the PLC control panel, the anti-surge calculation module judges whether the draught fan reaches the surge critical or not, part of allowance is reserved for a surge value, a program acts on the critical state, damage caused by surge to the draught fan is avoided to the maximum extent, two sets of draught fan surge preventing schemes are arranged, and the draught fan is prevented from being damaged by surge. And according to the pressure allowance reserved in the corresponding program of the anti-surge calculation module, the motor is controlled to increase the rotating speed or the air release valve is controlled to act, and the use requirement for preventing fan surge is met.