46results about How to "Overcome flow resistance" patented technology

The invention relates to a non-resistance pressure balance anti-resistance device of heat pump of ground water, and relative system, wherein the outer frame (1) of anti-resistance device has external water inlet (6) and external water outlet (7); the rotation filter cylinder (3) is inside the outer frame (1); the rotation filter cylinder (3) is divided into internal water inlet area (4-1) and internal water outlet area (4-2); the internal water inlet area (4-1) is connected to the internal water inlet area outlet (8) and the internal water outlet area (4-2) is connected to the internal water outlet area inlet (9). The invention has stable water pressure and stable flux, with small size and low cost.

The invention discloses an ice cold accumulation supplying cold equipment of city bus including accumulation ice trough, draining valve, circulating pump, scroll heat exchanger, condensate drainpipe, screw type ventilator, circulating pipe, expansion tank, triple valve and expansion pipe. The equipment is no compressor, using miniwatt circulating pump to conquer flow resistance of secondary refrigerant circulating pipe and scroll heat exchanger, secondary refrigerant circulating pipe is drove by circulating pump and transport the energy of accumulation ice trough to scroll heat exchanger, the heat air in the bus flows along scroll heat exchanger shell pass, then be cooled by scroll heat exchanger to deliver into bus, so bus indoor cooling realized. The ice is supplied by ice house utilizing low-cost night electric energy to release bus engine load, induce tail gas discharge and no condensation heat extraction. The equipment is character by simple structure, environmental protection, low cost, easy fixing and so on.

The invention belongs to the technical field of coal mine safety, and particularly relates to a coal seam air injection expansion secondary permeability improvement method adopted after liquid CO2 blasting and used for promoting gas extraction. According to the method, blastholes and gas extraction holes are formed in a work face at the same time and formed at equal intervals, and liquid CO2 blasters are mounted in the blastholes to conduct liquid CO2 blasting; then, gas extraction pipes are laid in the gas extraction holes, the gas extraction holes are sealed, air of a coal mine down-hole compressed air system serves as an air source of air injection, coal seam air injection expansion secondary permeability improvement is conducted, the air injection air source is connected into the blastholes, the blastholes are sealed, an air injection and gas extraction system is started, and gas extraction is conducted. By the adoption of the method, gas extraction scalar quantity is greatly increased, and huge economical and social benefits are achieved; meanwhile, the technical process is simple, and the method has very good application and popularization prospects.

The invention relates to an on-site comprehensive treatment method for wastewater, waste mud during drilling wells and the engine exhaust, which comprises the following methods: using waste to control waste by utilizing the residual heat of circulating cooling water to treat wastewater through the multi-effect evaporation, treating the waste mud by fluidization drying through the engine exhaust residual heat and high temperature thermal decomposition, and removing the exhaust gas and harmful substances and reducing the exhaust noise. Take a diesel engine with the power of 500 KW for example, the diesel engine is able to simultaneously treat the wastewater at the speed of 900 kg / h and recover 90-95 % of the wastewater in the form of condensed water, treat the water mud with a solid content rate of 10-40 % at a speed of 260kg / h and disperse the waste mud into fog drops, which are in counter current contact with the engine exhaust gas of 200-380 DEG C and conduct heat and mass transfer with exhaust gas, and finally are heated in a fluidized bed to be recovered in harmless solid phase particles or in superfine powder; meanwhile, the engine exhaust gas conducts momentum, heat and mass transfers with the particles in the fluidized bed as well as the fog drops above the fluidized bed, so as to cool and abate the noise, then the waste water is used to wash away the harmful substances; all the consumption of external power does not exceed 30 kW.

Disclosed is an electric car cooling waterway. The electric car cooling waterway comprises at least two unit waterways (5, 6). Each unit waterway respectively passes through different parts, to be cooled, of the electric car, and two ends of each unit waterway are respectively communicated with a water inlet chamber (2) and a water outlet chamber (3) of a radiator (1) to respectively form a circulating waterway. In addition, the invention further provides an electric car cooling system provided with the electric car cooling waterway and the electric car. According to the electric car cooling waterway and the electric car cooling system formed by the electric car cooling waterway, through the formation of more than two independent or shunt-wound cooling circulation waterways, the number of parts to be cooled on each unit waterway is enabled to be relatively reduced, and therefore arrangement of waterways is simplified, flow resistance of cooling water is notably reduced, the cooling water is enabled to circulate smoothly, and therefore each parts, to be cooled, of the electric car can be effectively cooled.

The invention provides an injection fragmentation device, which comprises a casing (5), a primary nozzle (6) and a secondary nozzle (3) are arranged on external circumferential wall of the casing, a primary converging-diverging duct (19) arranged between the primary nozzle (6) and the secondary nozzle (3) and on the internal wall of the casing; and a secondary converging-diverging duct (23) arranged at bottom of the casing. In addition, the invention also provides an injection fragmentation method by using the injection fragmentation device. The invention provides the injection fragmentation device and the injection fragmentation method, so that starchiness raw material undecanted wine with granularity greater than 3mm can be fully and effectively fragmented.

The invention relates to a double-layer current collector and a mixed flow fan provided with the double-layer current collector. The double-layer current collector comprises an outer layer current collector, an inner layer current collector and struts; and the inner layer current collector is coaxially arranged in the outer layer current collector, and the outer layer current collector and the inner layer current collector are connected through the multiple struts in the radial direction. The mixed flow fan based on the double-layer current collector comprises the double-layer current collector, an impeller, a wheel cover, guide vanes, a casing and a motor. The scheme is reasonable, the structure is simple, implementation is easy, and by means of the current collector, the advantages of the mixed flow fan can be sufficiently achieved.

A mixed flow fan comprises a motor, a casing, an impeller, guide vanes and a flow collector. The guide vanes are coaxially and fixedly arranged on the inner side of one end of the casing; the motor isarranged in the center of a hub of the guide vanes; an output shaft of the motor is fixedly connected with the center of the impeller; the flow collector is arranged on the inner side of the other end of the casing, and the flow collector and the impeller are on the same side; the hub of the guide vanes and the hub of the impeller have the same diameter. The variable concave-convex casing line provided by the invention is formed by tangency of a section of concave arc and a section of convex arc, so that the included angle between the inlet and the outlet and the rotating shaft is zero, meanwhile, a large diameter difference between the inlet and the outlet of the impeller can be ensured, and the airflow pressure is increased by fully utilizing centrifugal force. By the adoption of the design, the size of a non-acting area is reduced, airflow axially enters the non-acting area, energy is obtained in the impeller and converted into axial flow from inclined upward flow, then part of kinetic energy of the airflow is converted into pressure energy in the guide vanes, and airflow pressure is improved.

According to the fuel cell thermal management system and the control method thereof, the energy utilization rate and the comfort of a passenger compartment are both considered on the premise that the appropriate temperature of the fuel cell is maintained, meanwhile, the water heating system and the cooling system use independent pipelines, the water heating system can be freely arranged, cheaper fluid is selected as a working medium, and the energy consumption is reduced. The deionizer can work at any time according to needs, flow resistance caused when the deionizer does not need to work is avoided, on the basis that a cooling system and a water heating system are comprehensively considered, the working condition is divided into a plurality of sub-working conditions, the working condition in starting is open-loop control, rapid temperature rising is achieved, and the working condition in normal operation is closed-loop control. According to the method, in particular, feedforward and feedback combined control is adopted, an initial control parameter is not simply set as a fixed value any more, a variable feedforward value is determined according to working conditions, and therefore the overshoot is more accurately reduced.

The invention provides a flow-mixing fan with sine type meridional flow channels. The flow-mixing fan with the sine type meridional flow channels comprises a motor, a machine case, an impeller, guidevanes and a flow collector. The guide vanes are coaxially and fixedly arranged on the inner side of one end of the machine case. The motor is arranged in the center of wheel hubs of the guide vanes. The output shaft of the motor is fixedly connected with the center of the impeller. The flow collector is arranged on the inner side of the other end of the machine case. The flow collector and the impeller are on the same side. The wheel hubs of the guide vanes and wheel hub of the impeller share the same diameter. According to the flow-mixing fan with the sine type meridional flow channels, the scheme is reasonable, and the structure is simple and easy to achieve; full play can be given to advantages of the flow-mixing fan; and in addition, the fan structure is compact, the air volume is large, noise is little, and static pressure efficiency is high.

A lithium bromide absorption refrigerator of hot water type between single effect and double-stage is prepared as arranging the first and the second high pressure generator as well as condenser unitedly in the same shell being set at top of machine set; arranging medium pressure generator and absorber unitedly in the same shell being set at second layer of machine set; arranging high temperature solution heat exchanger in three streams type at the third layer; arranging low pressure absorber and evaporator unitedly in the same shell being set at fourth layer of machine set and arranging low temperature solution heat exchanger, solution pump and refrigerant pump at bottom layer of machine set.

The invention provides an accurate control system for natural cooling and automatic cooling of a boiler and a method. The system comprises the boiler and a chimney; the bottom part of the chimney is provided with an ejector device; the ejector device is externally connected with compressed air through a compressed air pipeline; the compressed air pipeline is provided with a pipeline shut-off valveand a pipeline regulating valve; the boiler is equipped with a pressure transmitter; and the pressure transmitter is interlocked with the pipeline regulating valve, so that proportion integration differentiation (PID) regulating is performed on the opening of the pipeline regulating valve according to furnace negative pressure of the boiler. According to the system, the bottom part of the chimneyis provided with the ejector device, so that the system forms negative pressure at the position of the chimney under the condition of natural ventilation to overcome flow resistance of a flue duct; meanwhile, interlocking control is performed on the pipeline regulating valve and the furnace negative pressure, and closed-loop regulation can be performed on the negative pressure at the position ofthe chimney according to a cooling curve, and then, the temperature drop rate of the boiler is regulated, and thus, the problem that the cooling rate cannot be accurately controlled during rapid cooling of the boiler when the boiler is shut down, and during conventional natural ventilation cooling is effectively solved.

The invention discloses a solar water heater. The solar water heater is characterized by comprising a solar heat collector, a cold water tank, a hot water tank and a support; the solar heat collectorcomprises a frame and multiple parallel solar heat collection pipes arranged side by side in the frame, the frame comprises a top plate, a bottom plate and side plates on the two sides, the top plateand the bottom plate are provided with corresponding inserting holes used for penetrating the solar heat collection box, each inserting hole is internally provided with a sleeve gasket matched with the corresponding solar heat collection pipe, the frame of the solar heat collection device is arranged on the support, the cold water tank is arranged on the lower end of the support, and the hot watertank is arranged at the upper end of the support.

The invention discloses a flat plate type loop heat pipe suitable for two vertical heat sources. The flat plate type loop heat pipe comprises an evaporator, an injection pump, a jet flow heat exchangecavity and a cooler, the bottom surface of the evaporator is a horizontal heat exchange surface, the side surface of the jet flow heat exchange cavity is a vertical heat exchange surface, a liquid outlet of the evaporator is connected with the injection pump, a gas outlet of the evaporator is connected with the injection pump, the injection pump is connected with the jet flow heat exchange cavity, and the jet flow heat exchange cavity is connected with a liquid inlet of the evaporator through the cooler. According to the flat plate type loop heat pipe suitable for the two vertical heat sources, the jet flow impact enhanced heat exchange technology is coupled with the loop heat pipe, so that the effect that heat dissipation is carried out on the two vertical heat sources is realized, and the advantages of high reliability and high jet flow impact heat exchange coefficient of the loop heat pipe are retained.

The invention discloses a method and a device for preparing O-methyl thiophosphoryl dichloride from thiophosphoryl chloride. The method utilizes a three-stage reaction unit series mode, a first-stage reaction unit comprises a stirring reaction kettle and a cooling medium system, a raw material containing thiophosphoryl chloride and methyl alcohol is continuously added into through an inlet of a circulation pump, the raw material is cooled by a cooling medium system to be sent into the stirring reaction kettle, a part of material flow generated by reaction of the stirring reaction kettle can automatically flow into a second-stage reaction unit through liquid level difference, a part of material flow is conveyed to the cooling medium system by the circulation pump to be cooled and returned to the stirring reaction kettle, the second-stage reaction unit and a third-stage reaction unit are communicated through a horizontal pipeline to jointly form a U-shaped material flow channel, and self oscillation can be generated in a material flow flowing process. The preparation method disclosed by the invention has the advantages of high reaction speed, large production capacity, low energy consumption and good product quality.

The invention relates to a non-resistance pressure balance anti-resistance device of heat pump of ground water, and relative system, wherein the outer frame (1) of anti-resistance device has external water inlet (6) and external water outlet (7); the rotation filter cylinder (3) is inside the outer frame (1); the rotation filter cylinder (3) is divided into internal water inlet area (4-1) and internal water outlet area (4-2); the internal water inlet area (4-1) is connected to the internal water inlet area outlet (8) and the internal water outlet area (4-2) is connected to the internal water outlet area inlet (9). The invention has stable water pressure and stable flux, with small size and low cost.

The invention relates to an assembly for a hydraulic motor-vehicle brake system, comprising: a first connection (1) for connecting to a pressure chamber of a master brake cylinder; a second connection (2) for connecting to a pressure-medium reservoir, in particular a pressure-medium reservoir under atmospheric pressure; an output pressure connection (3), in particular for connecting to a pressure modulation device; a pump assembly (4, 14, 24), which has at least a first suction side (41, 241), which is connected (12b, 13) to the second connection (2); a hydraulic connection (11) between the first connection (1) and the output pressure connection (3), in which hydraulic connection a first valve (5) is arranged, which is open when current is not applied and which can be controlled in an analog manner; and a hydraulic connection (12) between the first connection (1) and the second connection (2), in which hydraulic connection a second valve (6) is arranged, which is closed when current is not applied; wherein the first pressure side (42, 242) of the pump assembly, which is associated with the first suction side, is connected to the first suction side (41, 241) by means of a third valve (8, 8'), which is open when current is not applied and which can be controlled in an analog manner. The invention further relates to a brake system having such an assembly.

The present invention relates to a subtype swine influenza detection chip apparatus with a strongly-hydrophobic PDMS substrate, and belongs to the field of analysis and testing. According to the present invention, the use of inexpensive and easily-processed polydimethylsiloxane (PDMS) to produce the substrate of a microfluidic chip for diagnosing subtype swine influenza has a plurality of barriers; and the subtype swine influenza detection chip apparatus is characterized in that the substrate selects the PDMS having an original ecological surface, a hinge type fixture provided with a miniatureultrasonic wave transducer is manually fastened and positioned at the position close to the sample liquid flow terminal of the microfluidic chip, ultrasonic waves induce the sample liquid flow to flow from the sample injection end of the chip to the terminal direction along the pipeline of the chip, the pipeline of the chip is filled with a micro-scale silica particle filler, and the micro-scalesilica particle filler is used for supporting the inner wall of the pipeline, compensating the original hydrophobic pipeline with the set of hydrophilic micro-flow channels, and extruding and coveringthe inner wall surface of the pipeline so as to reduce the opportunity of the contact between biological macromolecules and the inner wall surface.

The invention relates to a solenoid valve, in particular for controlling a brake pressure of a wheel brake of a motor vehicle, comprising an axially moveably mounted armature, wherein one end of the armature is associated with a pole core and a valve sealing element is arranged at another end of the armature, wherein the armature has an axial through-opening, wherein a closure element is force-lockingly and / or interlockingly retained in the axial through-opening in a selectable position, and a plunger is axially moveably mounted in the axial through-opening, which provides a connection to thepole core in an installation position, wherein a pressure spring is positioned in the axial through-opening, wherein the pressure spring is retained in a pretensioned manner between the plunger and the closure element, characterised in that the closure element is designed as a three-dimensionally convex element.

The invention discloses a stirring paddle. The stirring paddle comprises a rotating shaft, wherein a central hole is formed in the rotating shaft along the direction of a center shaft, material liquid conveying holes are formed in the surface of the rotating shaft, a U-shaped blade is fixedly arranged at the tail end of the rotating shaft, V-shaped blades are fixedly arranged between each of two sides of the U-shaped blade and the rotating shaft, a plurality of side blades are fixedly arranged on the V-shaped blades, a plurality of small holes are formed in the U-shaped blade and the V-shaped blades, and a transverse blade and a longitudinal blade which are vertical are fixedly arranged between the U-shaped blade and each of the V-shaped blade. Compared with the prior art, the stirring paddle has the beneficial effects that the plurality of small holes are formed in the blades, so that the high flow resistance of materials can be overcome, a large stirring area can be provided, and the materials are uniformly stirred; meanwhile, the stirring paddle is high in stability, long in service life, simple in structure and good in regulation performance.

The invention relates to a process for treating oily wastewater in a metallurgical industry and a device thereof. The process is that: a first-level filter lattice and a second-level filter lattice are arranged in a relatively-closed tank body in parallel, and a filter material is a porous filter material; the filter material is prepared by combining and sintering the following components by weight percentage: 30-50 percent of metallurgical comprehensive sludge, 18-30 percent of coal gangue, 8-20 percent of metallurgical plant fly ash and 10-40 percent of pulverized coal. Oily wastewater is conveyed to the first-level filter lattice, and the oily wastewater passes through the first-level filter lattice to obtain first-level filtered water; the first-level filtered water is conveyed to the second-level filter lattice, and the first-level filtered water passes through the second-level filter lattice to obtain second-level filtered water; and after filtering is finished, the first-level filter lattice and the second-level filter lattice are subjected to back wash. The device comprises the tank body, wherein a filtering mechanism and a segregation board are arranged in the tank body. The filtering mechanism is segregated into the first-level filter lattice and the second-level filter lattice which are arranged in parallel along a vertical direction through the segregation board, and the bottom of the first-level filter lattice is communicated with the top of the second-level filter lattice through a connecting pipe.

The invention relates to a multi-channel microfluidic chip device for AIDS diagnosis comprising a hydrophobic substrate, which belongs to the field of analysis and testing. There are technical obstacles in making the substrate of the microfluidic chip for AIDS diagnosis with cheap and easy-to-process polydimethylsiloxane (PDMS). The gist of this case is that the substrate is selected from PDMS with an original ecological surface, and the hinged fixture with a micro-ultrasonic transducer is manually fastened and positioned at the position adjacent to the sample liquid flow terminal of the microfluidic chip, so as to The ultrasonic wave induces the sample liquid flow to flow from the sample injection end of the chip along the pipe of the chip to the terminal. The pipe of the chip is filled with micron-sized silicon dioxide particle fillers. The function of the filler includes supporting the inner wall of the pipe, And, a collection of hydrophilic micro-channels is used to compensate the originally hydrophobic channels, and the inner wall of the channel is squeezed and covered to reduce the chance of biomacromolecules in contact with the inner wall.

The invention discloses a preparation method of a stable-state chlorine dioxide solution of a food additive. The method comprises the following steps of: (1) preparing a sodium chlorate aqueous solution, extracting the sodium chlorate aqueous solution into a reaction kettle which is provided with an opening tube by using a water jet vacuum system, and heating to 50 to 60 DEG C; (2) diluting a concentrated sulphuric acid, mixing the concentrated sulphuric acid and methanol into a sulphuric acid methanol solution, and adding the sulphuric acid methanol solution into the reaction kettle in the step (1) for reaction; (3) supplying power by using the water jet vacuum system, cooling chlorine dioxide gas which is generated by the reaction in the step (2) by using a water cooler, and then carrying out further separation and purification in a gas liquid separator; and (4) preparing an absorption solution by adding water into the sodium carbonate of the food additive, sodium hydroxide and hydrogen peroxide, and absorbing the chlorine dioxide gas which is obtained in the step (3) by the absorption solution by using a two-stage absorption tower. The method has the advantages that: the process is feasible, short in flow, simple in operation, low in energy consumption and applicable to preparation of the stable-state chlorine dioxide solution of the food additive which meets an international standard under the conditions of all scales.

The invention relates to a supersonic flow mixing device based on partition plate rear edge jet flow disturbance. The device comprises a rigid partition plate arranged between two supersonic flows; and jet flow holes are formed in the rear edge of the partition plate and are used for injecting jet flow. According to the supersonic flow mixing device based on the partition plate rear edge jet flow disturbance, an independent channel is provided for the two supersonic air flows based on the partition plate, and the jet flow is injected through the jet flow holes formed in the rear edge of the partition plate. Under the disturbance of the jet flow of the partition plate, the flow of a mixing layer is unstable in advance, a large-scale vortex structure of the mixing layer is broken into a large number of small-scale vortex structures, and the contact area of upper and lower air flows can be effectively increased in the downstream evolution process so as to realize efficient mixing. The provided supersonic flow mixing device does not need additional excitation energy, is high in working condition adaptability and simple in structure, overcomes the defects of large flow resistance and total pressure loss, realizes efficient mixing through interaction of a jet vortex and a mixing layer vortex structure, and has relatively high engineering applicability.

The invention relates to a cheap microfluidic device for AIDS diagnosis with a specific fluid channel, and belongs to the field of analysis and testing. It is a technical objective that cheap and easy-to-process polydimethylsiloxane, i.e. PDMS, is used for preparing a substrate of a microfluidic chip for AIDS diagnosis. The PDMS has a spontaneous slow deformation property, and the spontaneous slow deformation property can cause a pipeline of the chip to gradually narrow; and the PDMS surface is strongly hydrophobic, the chemical modification effect of the surface is difficult to last for long, and the surface can further adsorb and engulf biological macromolecules. The key points of the invention are as follows: the substrate is prepared from the PDMS with an original form surface; the pipeline of the chip is filled with micron-sized silicon dioxide particles; and the micron-sized silicon dioxide particle fillers have the functions of supporting the inner wall of the pipeline, compensating for the original hydrophobic pipeline by using a collection of hydrophilic microfluidic channels, and reducing the opportunity of the contact of the biological macromolecules and the inner wall surface of the pipeline by performing hard extrusion and covering the inner wall surface.

A lithium bromide absorption refrigerator of hot water type between single effect and double-stage is prepared as arranging the first and the second high pressure generator as well as condenser unitedly in the same shell being set at top of machine set; arranging medium pressure generator and absorber unitedly in the same shell being set at second layer of machine set; arranging high temperature solution heat exchanger in three streams type at the third layer; arranging low pressure absorber and evaporator unitedly in the same shell being set at fourth layer of machine set and arranging low temperature solution heat exchanger, solution pump and refrigerant pump at bottom layer of machine set.

The invention relates to a multi-stage corona wind heat dissipation device, which comprises a heat sink, a pin electrode group, pore plate electrodes and a high-voltage power supply, wherein the heatsink includes a rib base and ribs expanding the heat dissipation area, and the rib base is contacted with a heat source and fixed on the heat source; the pin electrode group serves as an emitting electrode, is located in rib gaps of the heat sink and has no physical contact with the heat sink; the pore plate electrodes serve as collecting electrodes, are installed on the heat sink in an insulatedmanner, form electrode pairs with the pin electrode group together and has no physical contact with the pin electrode group; and the high-voltage power supply continuously output high voltage, the high voltage end is connected with the pin electrodes to as to provide high voltage for the pin electrodes, and the grounding end is connected with the pore plate electrodes. The multi-stage corona windheat dissipation device provided by the invention can greatly improve the convective heat transfer coefficient of air, thus improves the heat transfer capacity of the heat sink and enables the required area, volume and weight of the heat sink to be reduced; the number of stages of corona discharge can be adjusted according to the length of the heat sink, thereby being applicable to a wider heat power range; and the device has no moving components, is compact in structure and convenient to install, has high reliability and facilitates batch production.

The invention discloses an air conditioner indoor unit and an air conditioner, and relates to the technical field of air conditioners. The air conditioner indoor unit aims to solve the problem that use comfort is not high because of small air quantity, great noises, low efficiency, a small air feeding range and the like of the air conditioner indoor unit in the prior art. The air conditioner indoor unit comprises a machine enclosure, wherein an air inlet and air outlet are formed in the machine enclosure; at least one group of fan assemblies is arranged in the machine enclosure; each fan assembly comprises a motor and a diagonal-flow fan connected to a motor output shaft, wherein the air inlet side of the diagonal-flow fan is opposite to the air inlet, the air outlet side of the diagonal-flow fan is opposite to the air outlet, and a heat exchanger is arranged between the air inlet side of the diagonal-flow fan and the air inlet. The air conditioner indoor unit and the air conditioner are used for refrigerating, heating as well as fresh filtering of indoor air.

The invention relates to a wet acetylene automatic unloading calcium carbide crushing explosion-proof dehumidification ash-free dust removal system. The system comprises a rolling door and an exhaustfan arranged in an unloading area. A rolling door controlling device used for controlling the rolling door to roll and unroll is arranged on the upper part of the rolling door. The rolling rood controlling device, a power source, a motor driving the exhaust fan, and a speed regulating switch of the motor form an electric circuit. When the rotating speed of the motor increases, the rolling door controlling device is suitable for increasing opening of the rolling door. When the rotating speed of the motor decreases, the rolling door controlling device is suitable for decreasing the opening of the rolling door. The lifting height of the rolling door is controlled by the rolling door controlling device, and therefore the lifting height is in direct proportion to the rotating speed of the motor, and the rotating speed of the exhaust fan is in direct proportion to the lifting height of the rolling door.