52results about How to "Air volume adjustment" patented technology

Provided is a semiconductor refrigeration cooling dustproof type power distribution cabinet. The semiconductor refrigeration cooling dustproof type power distribution cabinet comprises a cabinet body in a cuboid shape, the cabinet body is formed by a left side plate, a right side plate, a top board, a base plate, a rear side plate, and a cabinet door, a separating plate is arranged between the left side plate and the right side plate in a horizontal manner, the left side plate and the right side plate are respectively provided with shutters, a left vertical plate and a right vertical plate are arranged between the top board and the base plate, the left vertical plate is parallel and adjacent to the left side plate, the right vertical plate is parallel and adjacent to the right side plate, the left vertical plate and the right vertical plate are uniformly provided with air vents, electrical elements are respectively arranged at the right side of the left vertical plate and the left side of the right vertical plate, an air quantity rotation adjusting mechanism is arranged between the center of the top board and the center of the base plate, and the upper surface of the top board is provided with a refrigeration air supply device communicated with the air quantity rotation adjusting mechanism. According to the semiconductor refrigeration cooling dustproof type power distribution cabinet, the structure is simple, the operation is easy, the heat radiation effect is good, the energy consumption is low, the reliability is high, the dustproof effect is good, the electrical elements in the cabinet body can maintain the temperature for good work state via a structure for adjusting the air supply amount in multiple ways, and the service lifetime of the electrical elements is extended.

The invention discloses an intelligent kitchen ventilator. The intelligent kitchen ventilator comprises a main control board and a smoke detector connected with the main control board; the main control board is used for switching electric signals generated by the smoke detector into digital values and using an average value of the multiple digital values obtained lately as a standard value; according to the standard value, the main control board obtains a variance of the multiple digital values and judges whether smoke exists or not based on a ratio of the variance to a smokeless reference value; the main control board is further used for determining the smoke concentration according to the latest digital value in the multiple digital values when existing smoke is judged and controlling the rotating speed of a kitchen ventilator fan according to the smoke concentration. By means of the intelligent kitchen ventilator, easy diffusion of the smoke in the air or effects of other interference elements of an outside environment and the like on smoke detection can be prevented, the anti-interference capability is high, the detection precision can be improved, the intelligent kitchen ventilator is beneficial for adjusting the kitchen ventilator fan blowing rate, and the intelligence degree is high.

Provided is a semiconductor refrigeration air supply heat radiation type high-voltage switch cabinet. The semiconductor refrigeration air supply heat radiation type high-voltage switch cabinet comprises a cabinet body in a cuboid shape, the cabinet body is formed by a left side plate, a right side plate, a top board, a base plate, a rear side plate, and a cabinet door, a separating plate is arranged between the left side plate and the right side plate in a horizontal manner, the left side plate and the right side plate are respectively provided with shutters, a left vertical plate and a right vertical plate are arranged between the top board and the base plate, the left vertical plate is parallel and adjacent to the left side plate, the right vertical plate is parallel and adjacent to the right side plate, the left vertical plate and the right vertical plate are uniformly provided with air vents, electrical elements are respectively arranged at the right side of the left vertical plate and the left side of the right vertical plate, an air quantity rotation adjusting mechanism is arranged between the center of the top board and the center of the base plate, and the upper surface of the top board is provided with a refrigeration air supply device communicated with the air quantity rotation adjusting mechanism. According to the semiconductor refrigeration air supply heat radiation type high-voltage switch cabinet, the structure is simple, the operation is easy, the heat radiation effect is good, the energy consumption is low, the reliability is high, the dustproof effect is good, the electrical elements in the cabinet body can maintain the temperature for good work state via a structure for adjusting the air supply amount in multiple ways, and the service lifetime of the electrical elements is extended.

An integrated heat dissipation and dust removing distribution box comprises a cuboid-shaped box body, wherein the box body comprises a left side plate, a right side plate, a top plate, a baseplate, a rear side plate and a box door, wherein shutters are arranged on the left side plate and the right side plate respectively; soot cleaning structures are arranged on the shutters on the inner walls of the left side plate and the right side plate; a left standing plate and a right standing plate are arranged between the top plate and the baseplate, and are parallel and adjacent to each other; the right standing plate and the right side plate are parallel and adjacent to each other; the air extracting holes are uniformly formed in the left standing plate and the right standing plate; electric elements are arranged on the right side of the left standing plate and the left side of the right standing plate; rotary dust blowing mechanisms are arranged at the tops of the electric elements; a wind volume rotational adjusting mechanism is arranged between the center of the top plate and that of the baseplate. The integrated heat dissipation and dust removing distribution box has the advantages that the structure is simple; the operation is easy; the radiating effect is high; the energy consumption is low; the reliability is high; the dust-proof effect is good; the temperature of the electric element in the box body can be adjusted to meet the requirement of a favorable operating state by adjusting the wind-drawing volume, so as to prolong the service lives of the electric elements.

The invention discloses a through-wall purification ventilation pipe with an induced draft fan. The through-wall purification ventilation pipe comprises a ventilation pipe, a filter device and a pipefan; the ventilation pipe comprises a first section of ventilation pipe and a second section of ventilation pipe; the pipe fan is arranged on the first section of ventilation pipe; the filter device comprises a filter screen and a filter screen mounting shell; the filter screen mounting shell comprises two half mounting shells with the same structures; the first section of ventilation pipe is provided with a first mounting cover; and the second section of ventilation pipe is provided with a second mounting cover. The through-wall purification ventilation pipe is provided with the induced draftfan for achieving a suction function; the novel filter screen is arranged in the ventilation pipe to achieve a filter function; through extension of a gas filter path, the designed filter screen achieves the purpose of prolonging the contacted time of gas with the filter screen, so that the purifying efficiency of the filter screen is high, and the filter screen can be singly used by deviating from a purifier when the air purifying effect is improved; and in addition, an air volume adjusting device is designed to achieve less mounting space, simple operation, reliable structure and high automation degree.

The invention discloses an air supply device and a machine room with the air supply device. The air supply device can realize the accurate air quantity control of each branch air channel and can effectively cool a machine in the machine room. The device comprises a main ventilating air channel and at least two groups of branch air channels which are arranged on the main ventilating air channel along the extending direction of the main ventilating air channel, a main air gap is arranged at one end of the main ventilating air channel, at least one branch air gap is arranged on each branch air channel, and a movable wind screen which is inserted into the main ventilating air channel, intercepts the air flow in the main ventilating air channel and guides the air flow to the corresponding branch air channel. When the machine room is arranged, a machine to be cooled is arranged between the two adjacent branch air channels arranged along the extending direction of the main ventilating channel. The machine room can effectively utilize the cooling air to cool the machine, so that the temperature of the machine is kept in a reasonable range stably for a long time, and thus the machine can run stably and normally for a long time.

The invention discloses an energy-saving running control system and a method for a tunnel construction ventilation system. The energy-saving running control system comprises a power source, a controller module, a parameter setting module and a frequency converter, wherein the parameter setting module and the frequency converter are connected with the controller module, a fan is connected with an output end of the frequency converter, a communication module is connected to an input end of the controller module, and a wind speed sensor is connected to an input end of the communication module. The method includes steps of firstly, setting a wind speed standard value; secondly, selecting the wind speed standard value; thirdly, detecting and transmitting wind speed signals in real time; fourthly, sampling and analyzing the signals; fifthly, carrying out variable-frequency speed regulation for the fan; and sixthly, selecting a wind speed standard value of another operation procedure via the parameter setting module when the other operation procedure of tunnel construction is carried out, and repeating the second step, the third step, the fourth step and the fifth step until all operation procedures of tunnel construction are completed. The energy-saving running control system and the method have the advantages that the design is novel and reasonable, service operation is convenient and speedy, control precision and work reliability are high, purposes of energy conservation and consumption reduction are achieved, practicality is high, and popularization and application are facilitated.

The invention discloses a mining anti-explosion coal bunker gas automatic emission control device and belongs to the technical field of coal bunker gas emission. A bunker gas automatic emission control system with high safety, good energy-saving effect and capability of real-timely adjusting fan ventilation quantity according to gas concentration in a coal bunker is provided. According to the technical scheme, the mining anti-explosion coal bunker gas automatic emission control device comprises a processor unit, a gas concentration collecting unit, a power supply unit, a fan operation state control unit, a fan operation state monitoring unit, a fan control device, a non-intrinsic electric device control unit and a non-intrinsic electric switch unit, signal output ends of the gas concentration collecting unit and the fan operation state monitoring unit are electrically connected with a signal input end of the processor unit, and a signal output end of the processor unit is electrically connected with signal input ends of the fan operation state control unit and the non-intrinsic electric device control unit. The mining anti-explosion coal bunker gas automatic emission control device is applied to the field of coal mines.

The invention discloses a test tube rack capable of dynamically controlling evaporation capacity. The test tube rack comprises an inverted-T-shaped test tube rack supporting body, an air chamber and awater collecting chamber are arranged on a supporting frame, a plurality of air outlets are formed in the air chamber, a supporting pipe is arranged on the supporting frame, one end of the supportingpipe is connected with the air outlets, and a control plug is arranged at the other end of the supporting pipe and can adjust the air volume flowing out of the control plug according to the weight ofa test tube. The invention provides the test tube rack capable of dynamically controlling evaporation capacity, which can dynamically adjust dry air of the test tube rack. Air in the air chamber is blown into the supporting pipe through the air outlets and blown out of the control plug, the control plug can adjust the air outlet amount according to the weight of the test tube, the effect that a small test tube blows a small amount of air and a large test tube blows a large amount of air is achieved, and therefore the air outlet amount can be adjusted according to the test tube size.

The invention aims to provide a vehicle air-conditioning device which has an air quantity switching device with a compact structure, wherein the air quantity switching device (13) adopts the following structure that: the hollow physical form of the device consists of a first truncated cone part, a second truncated cone part and a third truncated cone part (50, 40, 30) which are truncated cone-shaped and are overlapped; the upper surfaces and the lower surfaces of the truncated cone parts (50, 40, 30) are provided with upper opening parts (54, 44, 34) and lower opening parts (59, 49, 39), while the inclined planes (55, 45, 35) are provided with inclined opening parts (56, 46, 36); two arm parts (21, 21) are erected at the lower part of the first truncated cone part (50) and are provided with an air quantity adjusting disc (22); moreover, a steering unit (15) is embedded in the upper part of the air quantity adjusting disc (22).

The invention discloses an adjustable air passage for locomotives, comprising a main air passage and branched air passages communicated with the main air passage, wherein the main air passage is communicated with a draught fan, and the branched air passages are communicated with equipment needing ventilation. The adjustable air passage for the locomotives is characterized in that each branched air passage is provided with an air flow adjusting device. According to the scheme provided by the invention, for the air flow adjusting device of each branched air passage, the stroke of a translation rod is adjusted by adjusting a nut, a rotating rod drives an adjusting plate to change a vertical inclined angle between the adjusting plate and the branched air passage, thereby adjusting the air flow matching among all branched air passages.

The invention discloses a ventilation device applicable to SPF-grade experimental animal raising equipment. The ventilation device comprises a ventilation panel, a plurality of ventilation ports and an air volume adjusting plate, wherein the ventilation ports are formed in the ventilation panel; the air volume adjusting plate is rotatably arranged on the ventilation panel through a rotating shaftand provided with openings corresponding to the ventilation ports one by one, and ventilation passages for passing of air flow are formed when the openings and the ventilation ports are partially overlapped with each other. The micro-barrier-environment experimental animal raising equipment comprises the ventilation device. According to the ventilation device applicable to the SPF-grade experimental animal raising equipment, by rotating the air volume adjusting plate to make the openings and the ventilation ports partially overlapped with each other, the ventilation passages for passing of airflow are formed, the size of the ventilation passages can be adjusted by rotating the air volume adjusting plate in order to adjust the air flow passing through different sectional areas and furthercontrol the air volume, and the air volume can be conveniently controlled.

The invention relates to the technical field of safety equipment facilities of power equipment, in particular to a cross-flow type cooling fan with a damping function for a dry-type transformer, and solves the technical problem that an existing cooling fan cannot be independently disposed when a high-voltage coil and a low-voltage coil of a unit transformer have cooling priority in the prior art. The fan specifically comprises a body, wherein an air volume adjusting assembly can periodically move to a first air outlet of the body, so that the air volume of the first air outlet can obtain a first limit state and a second limit state; the second air outlet communicates with the first air outlet; an air volume adjusting movement mechanism is used for driving the air volume adjusting assembly to periodically move in the cross section direction of the first air outlet; and the air volume adjusting assembly comprises an air channel shielding structure. The technical scheme can provide larger air volume, is variable in air volume, is lower in noise, and is suitable for power consumers such as transformer substations, residential quarters, commercial mansions, industrial enterprises and the like and some areas with severe environments.

The invention discloses a through-wall purifying ventilating pipe with a ventilating flow adjusting structure. The through-wall purifying ventilating pipe comprises a ventilating pipe and an air volume adjusting device comprising a valve and a transmission unit. The transmission unit comprises a screw rod, a nut and a driving motor. A circle of retaining flanges is arranged on the inner side of the ventilating pipe. Four limiting sensors, a PLC, a PM2.5 sensor and a CO2 sensor are further arranged. The through-wall purifying ventilating pipe with the ventilating flow adjusting structure is small in mounting space, easy to operate and reliable in structure; and a filter net of a novel structure is arranged in the ventilation pipe, the purpose of prolonging the contact time of gas and the filter net is achieved by prolonging the filter path of the gas, and the purifying efficiency of the filter net is high.

The invention discloses a device and a method for continuously preparing charcoal, which relate to the field of comprehensive utilization of forestry and agricultural residue resources. The device comprises a hollow annular furnace body, wherein a material feeding and discharging chamber is communicated to the outer side of the annular furnace body; a material transferring track is commonly arranged in the annular furnace body and the material feeding and discharging chamber; a feeding and discharging end of the material transferring track parallelly penetrates through the material feeding and discharging chamber to the outside; a material tank automatically enters the material feeding and discharging chamber through the material transferring track, and is preheated in the material feeding and discharging chamber; the preheated material tank enters the annular furnace body so as to be carbonized; the carbonized material tank automatically enters the material feeding and discharging chamber through the material transferring track; at the moment, the carbonized material tank preheats forestry and agricultural residues in a non-carbonized material tank, the carbonized material tank is conveyed outside the material feeding and discharging chamber through the material transferring track, and finally, the charcoal in the material tank is taken out. The device provided by the invention can be used for continuously producing without the need for flameout, the production efficiency is high, and the carbonization energy consumption is reduced.

The invention discloses a positive pressure ventilation system of a power chamber of a diesel locomotive. The positive pressure ventilation system comprises a sealed clean air chamber and a power chamber, wherein the clean air chamber is internally provided with a ventilation fan; the power chamber is internally provided with a main generator, a diesel engine and original equipment; the outlet end of an air filter is connected with the ventilation fan; the ventilation fan is respectively connected with the main generator, the diesel engine and the original equipment by virtue of a main air duct; the main air duct is externally connected with an air duct which is connected and communicated with an air outlet pipe of the power chamber. The positive pressure ventilation system has the advantages that air is clean; the air entering into the power chamber is filtrated by the air filter, so that the dust removal rate is up to 90%, and the power chamber is prevented from being polluted by outside dust and sand; positive pressure ventilation is adopted, so that the positive pressure station in the power chamber is ensured, and dust, sand and the like outside a vehicle are prevented from being sucked into the power chamber; district cooling is adopted, and cooling air is guided to different regions of the power chamber by virtue of air distribution ducts, so that the cooling target is explicit; the outlets of the air distribution ducts are provided with throttling plates, so that the air outlet quantity can be regulated.

The invention discloses an adjustable combined air valve for tunnel ventilation in the technical field of air valves for tunnels. The adjustable combined air valve comprises an air valve actuating mechanism, a rocker, a movement rod assembly and the like. The movement range of an air valve body is adjusted through the movement rod assembly so that the opening degree of the combined air valve can be steplessly adjusted and controlled, and the output air amount of an axial flow fan is changed, so that the switching adjustment of the ventilation amount of a short-term working condition and a long-term working condition is achieved; an external PLC controller can collect a 4-20 milliampere valve position feedback signal output by the air valve actuating mechanism to judge the opening degree ofthe air valve and the output air amount of the fan; only a soft starter needs to be adopted to control starting and stopping of the axial flow fan, and the opening degree of the combined air valve iscombined so that it can be ensured that the axial flow fan stably operates within the air amount range needed by the short-term working condition and the long-term working condition; and through themode, the air amount of the axial flow fan can be adjusted without a frequency converter, so that the frequency converter with a high working failure rate is replaced with the soft starter with a stable working state and the adjustable combined air valve.

The invention discloses vehicle-mounted driving recording equipment facilitating heat dissipation. The vehicle-mounted driving recording equipment comprises an event data recorder, a first fixing plate, a second fixing plate, a conical gas collecting hood and a wind guide pipe, wherein two ends of the first fixing plate and two ends of the second fixing plate are connected with a casing of the event data recorder through spring pillars respectively; a metal heat conducting plate is attached to the back of the event data recorder; the conical gas collecting hood is fixed at the top of a vehicle body and is provided with a gas inlet and a gas outlet; one end of the wind guide pipe is connected with the gas outlet, and the other end of the wind guide pipe penetrates through a vehicle body sunroof and extends to the surface of the metal heat conducting plate; an aluminum foil membrane layer is arranged on the surface of the event data recorder; a magnetic ring is arranged on a power line of the event data recorder. The equipment has the technical effects as follows: the design is reasonable, the use is convenient, the fixation is firm, use of other vehicle-mounted equipment cannot be disturbed easily, and heat dissipation is facilitated.

The knitting machine ( 1 ) according to the invention is provided with an air-conducting device ( 21 ) for conducting air into an air guidance space ( 18 ) that is embodied between the cam assembly ( 12 ) and the knitting cylinder ( 3 ). As a result of this air guidance space, cleaning air is supplied directly to the knitting tools ( 5 ), without requiring an outer casing around the cam assembly. In the same way, the air can also be guided between a dial and its associated cam assembly to corresponding dial needles or sinkers.

The invention belongs to the technical field of intelligent control, and discloses an intelligent control system and method for energy efficiency of an indirect evaporative cooling unit. The intelligent control system for the energy efficiency of the indirect evaporative cooling unit comprises an air inlet module, an air filter module, a pre-cooling module, a central control module, a heat recycling module, a temperature detecting module, a humidity detecting module, a cooling analyzing module, an evaporative cooling module, an air exhaust system, an air quantity detecting module and an air quantity regulating module. Air is filtered to remove impurities such as dust therein, so that damages on the evaporative cooling unit are avoided, the service life is prolonged, and cooled air is morepure and can be directly discharged; pre-cooling, heat recycling and cooling analysis can be performed before evaporative cooling, so that sufficient cooling of air can be realized, and cooling effectis better; and cooling analysis can realize accurate control on air temperature and humidity, so that cooling accuracy is better, and thus, energy-saving effect is realized.

The invention discloses an air volume adjusting device, and relates to the technical field of ventilation. The purpose of efficiently and conveniently adjusting the air volume of a fan is achieved. The main technical solution of the air volume adjusting device is characterized in comprising a frame, a plurality of blades and an adjusting mechanism, wherein the frame comprises opening ends which are oppositely arranged, the blades surround to form a wind shielding surface matching with the open end, a rotating shaft is arranged in the middle of each blade, the first end of each rotating shaft is rotationally connected with the frame, and the adjusting mechanism is connected with the second ends of the rotating shafts and used for adjusting the included angle between each blade and the planewhere the open end is located.

The invention discloses an air flow regulation structure, a fresh air machine and an air-conditioning method. The air flow regulation structure comprises a face cover, a driving mechanism, an air quality sensor and a controller, wherein the face cover is used for covering the air outlet end of a fresh air machine shell; the power output end of the driving mechanism is connected with the face cover, and the driving mechanism is used for driving the face cover to move in the direction far away from or close to the air outlet end of the fresh air machine shell; the air quality sensor is used fordetecting the quality grade of indoor air; the controller is in communication connection with the driving mechanism and the air quality sensor. The air flow regulation structure can continuously detect the quality grade of the indoor air, drive the air outlet end of the fresh air machine shell opposite to the face cover to move according to the quality grade of the indoor air and regulate the airflow of the fresh air machine to enable the quality of the indoor air to be within the preset grade all the time, and usage experience is good.

The invention discloses a drying oven capable of discharging air uniformly. The drying oven comprises an oven body, first air inlet cavities, second air inlet cavities, air blowing nozzles and air outlet cavities, wherein the first air inlet cavities, the second air inlet cavities, the air blowing nozzles and the air outlet cavities are all arranged in the oven body, the first air inlet cavities, the second air inlet cavities and the air blowing nozzles communicate in sequence, the plurality of sets of second air inlet cavities are arranged in parallel, the first air inlet cavities and the air blowing nozzles are arranged on the two opposite sides of the second air inlet cavities correspondingly, included angles between the side walls, away from the second air inlet cavities, of the first air inlet cavities and the second air inlet cavities are acute angles, included angles between the side walls, away from the air blowing nozzles, of the second air inlet cavities and the air blowing nozzles are acute angles, and flow guide valve plates are arranged at the joints where the first air inlet cavities are connected with the second air inlet cavities correspondingly. According to the drying oven, by improving structures of an air inlet channel and the air blowing nozzles, air blown out of the air blowing nozzles is more uniform, and therefore a drying effect of products such as pole pieces is optimized.

The invention provides a multifunctional pillowcase which comprises a pillowcase body, a nylon loop strip and a nylon hook strip. The pillowcase body is divided into a left short pillowcase and a right short pillowcase which are separate from each other in the middle of the pillowcase body, the nylon loop strip is arranged at the left edge of the back surface of the left short pillowcase, the nylon hook strip is arranged at the right edge of the back surface of the right short pillowcase, three left pillowcase bags are further arranged on the back surface of the left short pillowcase, the length directions of the three left pillowcase bags are identical to the length direction of the pillowcase body, three right pillowcase bags are further arranged on the back surface of the right short pillowcase, the length directions of the right pillowcase bags are identical to the length direction of the pillowcase body, left air bags and right air bags are respectively arranged in the left pillowcase bags and the right pillowcase bags, a left pillow inner loading opening and a right pillow inner loading opening are respectively formed in the left side and the right side of the front surface of the pillowcase body, a left zipper is arranged on the left pillow inner loading opening, and a right zipper is arranged on the right pillow inner loading opening. The multifunctional pillowcase has the advantages that the multifunctional pillowcase can be changed into a single-person pillowcase or a double-person pillowcase according to actual requirements, and the sleep quality of users can be improved.

The invention discloses a device and a method for continuously preparing charcoal, which relate to the field of comprehensive utilization of forestry and agricultural residue resources. The device comprises a hollow annular furnace body, wherein a material feeding and discharging chamber is communicated to the outer side of the annular furnace body; a material transferring track is commonly arranged in the annular furnace body and the material feeding and discharging chamber; a feeding and discharging end of the material transferring track parallelly penetrates through the material feeding and discharging chamber to the outside; a material tank automatically enters the material feeding and discharging chamber through the material transferring track, and is preheated in the material feeding and discharging chamber; the preheated material tank enters the annular furnace body so as to be carbonized; the carbonized material tank automatically enters the material feeding and discharging chamber through the material transferring track; at the moment, the carbonized material tank preheats forestry and agricultural residues in a non-carbonized material tank, the carbonized material tank is conveyed outside the material feeding and discharging chamber through the material transferring track, and finally, the charcoal in the material tank is taken out. The device provided by the invention can be used for continuously producing without the need for flameout, the production efficiency is high, and the carbonization energy consumption is reduced.

The invention discloses an air supply device and a machine room with the air supply device. The air supply device can realize the accurate air quantity control of each branch air channel and can effectively cool a machine in the machine room. The device comprises a main ventilating air channel and at least two groups of branch air channels which are arranged on the main ventilating air channel along the extending direction of the main ventilating air channel, a main air gap is arranged at one end of the main ventilating air channel, at least one branch air gap is arranged on each branch air channel, and a movable wind screen which is inserted into the main ventilating air channel, intercepts the air flow in the main ventilating air channel and guides the air flow to the corresponding branch air channel. When the machine room is arranged, a machine to be cooled is arranged between the two adjacent branch air channels arranged along the extending direction of the main ventilating channel. The machine room can effectively utilize the cooling air to cool the machine, so that the temperature of the machine is kept in a reasonable range stably for a long time, and thus the machine can run stably and normally for a long time.

The invention discloses a high flexible air valve device. The air valve device can adjust air quantity under a gale situation. The air valve device which is used for adjusting the air quantity entered from an air inlet of the front end of a ventilating pipeline is arranged at the position of the ventilating pipeline, and therefore the air quantity sent by an air outlet of a rear end of the ventilating pipeline is constant. The air valve device is characterized by comprising an air-stopping portion, at least one air receiving portion, a positioning portion, a ventilation quantity setting portion and an air bag sensitivity maintaining portion. The air-stopping portion is used for stopping air. The air-stopping portion comprises an air-stopping plate and an elastic connecting structure; the at least one air-receiving is used for sensing size of air quantity, one end of the air-receiving portion is located on one side adjacent to an air outlet of the inner portion of the ventilating pipeline, and the other end is located at the outer portion of the ventilating pipeline, the at least one air-receiving portion comprises an air inlet nozzle, an air bag, an air bag supporting seat and a tube; the positioning portion comprises an air-stopping plate positioning portion and a positioning box; the ventilation quantity setting portion is used for adjusting the size of allowable ventilation quantity, and the ventilation quantity setting portion comprises an adjusting screw and an identification construction member.

A technique for supplying electric energy to the exhaust fan of electromagnetic stove is based on the mutual current inductor principle. The primary winding of mutual current inductor is serially connected to the inductive heating coil of electromagnetic oven. The output of its secondary winding is rectified and filtered to obtain a working current of fan, which is proportional with the working current of said heating coil. As a result, the fan can provide cooling wind according to the working state of heating coil.

The invention discloses a positive pressure ventilation system of a power chamber of a diesel locomotive. The positive pressure ventilation system comprises a sealed clean air chamber and a power chamber, wherein the clean air chamber is internally provided with a ventilation fan; the power chamber is internally provided with a main generator, a diesel engine and original equipment; the outlet end of an air filter is connected with the ventilation fan; the ventilation fan is respectively connected with the main generator, the diesel engine and the original equipment by virtue of a main air duct; the main air duct is externally connected with an air duct which is connected and communicated with an air outlet pipe of the power chamber. The positive pressure ventilation system has the advantages that air is clean; the air entering into the power chamber is filtrated by the air filter, so that the dust removal rate is up to 90%, and the power chamber is prevented from being polluted by outside dust and sand; positive pressure ventilation is adopted, so that the positive pressure station in the power chamber is ensured, and dust, sand and the like outside a vehicle are prevented from being sucked into the power chamber; district cooling is adopted, and cooling air is guided to different regions of the power chamber by virtue of air distribution ducts, so that the cooling target is explicit; the outlets of the air distribution ducts are provided with throttling plates, so that the air outlet quantity can be regulated.