59results about How to "Good ventilation and cooling effect" patented technology

The invention relates to a device and a method for intermittently ventilating and cooling a cable tunnel. The device comprises a temperature acquisition assembly, a fan controller and a fan which are sequentially connected with one another. The method includes that the temperature acquisition assembly measures the temperature of the inside of the cable tunnel and the temperature of an external atmospheric environment in real time and transmits the temperature of the inside of the cable tunnel and the temperature of the external atmospheric environment to the fan controller; and the fan controller intermittently starts or stops the fan according to current temperature conditions to cool the cable tunnel. Compared with the prior art, the device and the method have the advantages of good ventilating and cooling effects, capabilities of saving energy and advantageously prolonging the replacement cycle and the service life of the fan in the tunnel, and the like.

An outdoor laser lamp, includes a housing, a laser and a circuit board disposed inside the housing, and a lower mounting plate. A periphery of the lower mounting plate is in contact with an inner wall of the housing, a laser and a circuit board are located between the lower mounting plate and the top of the housing. Air vents are on the bottom of the housing; through holes are on the lower mounting plate, a raised ring wall surrounds each through hole and extends towards the bottom of the housing. The laser lamp realizes air circulation between outside air and the interior of the housing, realizes rapid heat dispersion of the laser lamp to ensure the functionality of the laser lamp. Additionally, it prevents water, entering the space where the circuit board is arranged, to avoid the influence on the internal circuits by water.

The invention discloses a ventilating slot structure of a generator rotor. The ventilating slot structure of the generator rotor comprises a slot bottom filler strip, a rotor winding, a filler strip under a wedge, a damping winding and a rotor slot wedge, wherein at least one channel forming radial ventilating with a vent hole is axially formed in the rotor winding, any two adjacent copper rows form the channel in the axial direction of the rotor winding, an air inlet in the lower part of the channel is slantly distributed in the direction of cooling air, a ventilating duct with an S-shaped cross section is at least arranged at the upper part of the channel, a plurality of copper wires in the axial direction of the copper rows at the upper part of the channel are distributed in a staggered manner, and any two adjacent copper rows form the S-shaped vent duct in the axial direction of the rotor winding. The air inlet in the lower part of the channel is slantly distributed in the direction of the cooling air, so that the air intake resistance of the air inlet of the channel is effectively reduced, the air intake flow rate of the cooling air entering the channel is increased, the cooling air entering through the air inlet in the lower part of the channel enters the S-shaped vent duct to form turbulent flow, so that the ventilating and cooling effects are greatly improved.

The invention provides a honeycomb-type closed ventilation cooling device for a motor. The scheme of the invention is that the back of a stator yoke of the motor is provided with axial vent holes in the peripheral direction; the axial vent holes are separated from a stator winding of the motor; stainless steel circular pipes are inserted into the axial vent holes; two ends of an axial ventilation pipe are fixedly connected with a round plate; a part, above the round plate, of a case is provided with a vent hole. The axial vent holes are uniformly arranged in the peripheral direction. The device provided by the invention is simple in structure, improves the ventilation cooling effect of the motor, and improves the capability of safety and stable operation of the motor. The device can cool a stator yoke back iron core and a linear winding, also can cool a stator terminal winding and a rotor core, can effectively improve the cooling effect of the stator yoke back iron core and the winding, also can enable the terminal winding to be isolated from the outside, and protects the terminal winding from being damaged by an environment.

The invention provides an ecological live pig raising house with a microbial fermentation bed and a large pen. The ecological live pig raising house is characterized in that the area of a pig house ranges from 1000 square meters to 2000 square meters, a wall is arranged on the periphery of the pig house in a surrounding manner, and the height of the wall ranges from 0.8m to 1.2m; a steel framed green house of the pig house is erected above the ground surrounded by the wall, shutter fabrics are respectively arranged on two sides of the long edges of the steel framed greenhouse, a wet curtain and a negative-pressure fan are respectively arranged on two sides of the short edges of the steel framed greenhouse, and spraying cooling devices are mounted on the outside of a roof; a sidewalk is arranged in the pig house along the wall on the periphery of the pig house, and the pen is arranged on the inner side of the sidewalk in a surrounded manner; fermentation bed packing, feeding troughs and a water trough are arranged in the pen, axial-flow fans and miniature spraying cooling systems are arranged at certain positions below the roof, and the distances from the certain positions to the roof range from 1.2m to 1.5m; the temperature and the humidity of the inside of the pig house can be automatically regulated according to data information of the brightness, the temperature, the moisture, the humidity, the air quantity and the amount of rainfall of an environment outside the pig house. The ecological live pig raising house has the advantages that the ecological live pig raising house is low in construction cost and suitable for ventilation cooling in summer, has a large raising space and an activity range and can be conveniently mechanically operated, and heat stress of pigs and fighting of individual pigs can be reduced.

The invention discloses an environmental friendly energy-saving vehicle brake block and relative producing method, which is characterized in that: it is prepared by following components and weight percentages: iron: lead: graphite: silicon dioxide: phosphor: sulfur flour: zinc stearate: lubricant= 77-85:2-3:9-15:1-3í†0.7 -1í†0.3-0.8í†0.6-0.8í†0.01-0.03. The producing method comprises: breaking the casting slag into 60-100 deals into container to be fed into electric furnace to be heated, and reduced into 97-98.5% iron content; adding lead powder, graphite powder, phosphor powder, sulfur flour powder, zinc stearate and lubricant, to be uniformly mixed and fed into vehicle brake block mould to be compressed and molded in 4-5T / cm2; getting out and putting it into the container to be sintered in high-temperature electric furnace for 2 hours; cooling and drilling the screw hole. The invention can save material, reduce the cost, improve the abrasion resistance property and reduce the abrasion of couple element.

The invention discloses a megawatt-grade permanent magnet generator relating to the technical field of permanent magnet generators. The megawatt permanent magnet generator comprises a rotor magnet steel fixing structure, a rotor magnet steel mounting tool, a motor ventilation structure and the like, wherein the rotor magnet steel fixing structure comprises a plurality of rotor core plates which are fixed on a rotating shaft trough square keys, every two adjacent core plates are separated by a stainless steel ventilating duct plate to form a radial rotor ventilating duct, stainless steel rotorcore pressing plates are respectively arranged at both ends of a rotating shaft core, and a plurality of magnetic steel slots are arranged on a core punching sheet close to the excircle of either core plate, matched with magnetic steel to be assembled in shape, and uniformly distributed on the circumference. The rotor has very simple structure and can be easily and conveniently assembled, the magnetic steel can be rapidly mounted, additional magnetic steel fasteners or other complicated fixing modes are not needed, the magnetic steel can be prevented from loosening or falling off, and the long-term, normal, reliable and safe operation of the motor is ensured.

The invention discloses a ventilated cooling device of a digital generating set. The ventilated cooling device comprises an engine side cover, a silencer arranged at the outer side of the engine side cover, a crankshaft, and an impeller arranged on the crankshaft and positioned between the engine side cover and the silencer, wherein one end of the crankshaft extends out of the engine side cover. The ventilated cooling device is characterized in that: a volute air guide device is also arranged between the engine side cover and the silencer, the volute air guide device is provided with a main air inlet and a main air outlet along the axial direction of the crankshaft, meanwhile, a volute cavity is formed in the volute air guide device, and the impeller is positioned in the volute cavity. The volute air guide device is arranged between the engine side cover and the silencer, the volute air guide device is combined with the impeller therein to form a 'turbo charging cooling device' together, and the 'turbo charging cooling device' can eliminate hot air circulation in the digital generating set and enhance the cooling effect.

The invention provides a brake disk of a motor vehicle. The brake disk of the motor vehicle is applied to disk brake systems of motor vehicles of automobiles, motorcycles and the like and comprises a circular disk body, radiating holes penetrating through the disk body are evenly arranged on the disk body along the circumferential direction, and one rising body with the streamline surface is arranged on an annular zone formed by clustering of the radiating holes on one side of the disk body every other radiating hole. The brake disk of the motor vehicle has good ventilation radiating performance and is convenient to manufacture, low in cost and large in strength.

The invention discloses a ventilation method for a high-temperature mine mining area. The working surface of the mining area uses the manner of single-wing production layout; a wind inlet manner of track going uphill or going downhill and wind inlet through a gate way is used, and fresh wind flows enter the working surface through a wind inlet gate way; a wind returning manner of a belt transporting gate way and a transporting machine going uphill or going downhill for return wind is used, and coal mine methane passing through the working surface enters the transporting machine going uphill or going downhill in the mining area for return wind through the belt transporting gate way; a coal mining working surface uses the manner of downward ventilation, and the direction of wind flows is consistent with the direction of coal flows. The ventilation method is suitable for the ventilation of high-temperature heat-damage mine mining areas, and through the application of the method, favorable ventilation and cooling effects of the high-temperature mine mining areas are achieved.

A ventilative dustproof damp-proof outdoor power equipment installation room comprises an outer chamber and an inner chamber. The lateral portion of the outer chamber is provided with outer window shades, the lateral portion of the inner chamber is provided with inner window shades, and the inner wall of the inner chamber is provided with air dryers at the inner window shades. A storage battery, a voltage stabilizer, a solar photovoltaic panel, a first draught fan, a second draught fan and a third draught fan are arranged at the top of the outer chamber. The first draught fan, the second draught fan and the third draught fan are connected with a first draught pipe, a second draught pipe and a third draught pipe respectively, and the first draught pipe, the second draught pipe and the third draught pipe extend into the inner chamber. An electric supporting adjustment device is arranged between the lower surface of the solar photovoltaic panel and the outer chamber. The ventilative dustproof damp-proof outdoor power equipment installation room has advantages that an inclination angle of the solar photovoltaic panel can be automatically adjusted according to a sunlight irradiation angle to completely increase photoelectric conversion rate, electric energy generated by the solar photovoltaic panel is adopted for cooling and dehumidifying the interior of the installation room and can be supplied to the state grid through an inverter while self sufficiency is guaranteed, and accordingly energy sources are completely saved and utilized.

The invention belongs to the technical field of heat dissipation of electric tools, and relates to a lithium battery pack heat dissipation device. The device comprises a battery pack lower cover, which is provided with an air outlet on one side and an air inlet on the other side in the length direction; a fan and a filter screen are arranged on the side corresponding to the air outlet of the battery pack lower cover; a battery pack is installed in the battery pack lower cover, and is limited and fixed by a protrusion of a bottom plate of the battery pack lower cover; a battery pack upper cover is buckled and connected to the battery pack lower cover, and a battery pack button is arranged at a connecting slot of the battery pack upper cover in a matching mode. The heat dissipation device can effectively fulfill the purpose of active heat dissipation and ensure safe and continuous operation of tools.

A low-temperature, green grain-preserving storage apparatus applied in the field of grain storage comprises a draught fan, circular vertical cages, semicircular ground cages, circular baffles and semicircular baffles, the left ends of the semicircular ground cages are connected with the draught fan, the upper parts of the semicircular ground cages are connected with the circular vertical cages, the right ends of the semicircular ground cages are provided with the semicircular baffles, the upper ends of the circular vertical cages are provided with the circular baffles, the circular vertical cages and the semicircular ground cages are provided with a plurality of elliptic holes, and the low-temperature, green grain-preserving storage apparatus is mounted in a large house type granary. In the working principle, the draught fan sends cold wind into the semicircular ground cages, the cold wind then enters the circular vertical cages, and enters each corner in the large house type granary via the elliptic holes on the circular vertical cages and the semicircular ground cages, and thereby the grain in the granary can be stored under uniform low temperature. The ventilating and cooling effect of the apparatus in the large house type granary is good, the grain is stored under low temperature, the temperature is uniform, the preservation time is long, safety is stable, the cost is saved, the weight loss of the grain is reduced, and the deterioration of grain quality is delayed.

The invention provides a microbial fermentation bed sow large-column breeding pigsty structure which comprises a pigsty body, pigsty internal configurations and a control cabinet. The pigsty body comprises a rectangular land parcel with the area of 2000-3000 square meters, an enclosure with the height of 0.8-1.2 mm and a steel frame greenhouse, and the height from the highest point on the inner side of a roof of the steel frame greenhouse to the rectangular land parcel is larger than or equal to 7.8 m; the pigsty internal configurations are arranged in the pigsty body and comprise a sidewalk arranged along the long edge side of a pigsty with a gate and an animal yard arranged on the inner periphery of the sidewalk; a fermentation bed padding pit with the depth of 60-80 cm is arranged in the animal yard, and a fermentation bed in the fermentation bed padding pit is divided into five columns; the control cabinet is controlled, so that the temperature in the pigsty body ranges from 29 DEG C to 31 DEG C, and the humidity in the pigsty body ranges from 60% to 80%. The microbial fermentation bed sow large-column breeding pigsty structure is low in construction cost, suitable for mechanical operation, good in ventilation and cooling effects in summer, capable of avoiding heat stress and beneficial to sow farrowing.

The invention discloses an emergency rescue tent used for a high-temperature windy desert area. The emergency rescue tent comprises a tent frame and tent cloth. The tent cloth is divided into an outer tent cloth body, an inner ceiling and a ground cloth body. The tent cloth covers the tent frame and is fixed to the tent frame through columns binding belts; the inner ceiling penetrates through a tent top transverse rod for forming a heat insulating ceiling with an outer tent top. The ground cloth is connected with the outer tent cloth body through nylon fasteners. The emergency rescue tent has the advantages of being novel in structure, high in operability, easy to install, detach, pack and maintain, high in firmness, resistant to wind and sand, resistant to high temperature and ventilated and is applicable to wild medical aid, battlefield medical care and disaster rescue.

The invention relates to an axial magnetic flux hub motor, which comprises a hub, a rotor, a stator and a central shaft. The central shaft penetrates through the hub, the rotor and the stator, the stator is fixedly connected with the central shaft, the rotor and the hub can rotate around the central shaft, the rotor comprises a plurality of pieces of magnetic steel, the stator comprises a positioning plate and a plurality of stator iron cores, the stator iron cores are located on the positioning plate, and windings are wound on the stator iron cores. The positioning plate is provided with an installation opening, and one end of the stator iron core is located in the installation opening. Compared with the prior art, a plurality of stator iron cores are arranged, so that the magnetic conductivity is better, and a good ventilation cooling effect is achieved; and the stator iron cores are independently arranged on the positioning plate, so that the disassembly and the maintenance are convenient, and the maintenance cost is reduced.

The invention relates to a generator, in particular to a water-wave-proof open-type self-ventilation main generator installed under a vehicle and used for an internal combustion motor car. The problemthat water waves easily enter a motor through an air inlet and an air outlet of an open type self-ventilation main generator on a power dispersion type internal combustion motor car is solved. An airduct is fixed to the outer end face of a non-transmission end cover of the main generator, the bottom of the air duct is sealed, an opening in the top of the air duct is upward, and an air inlet window right opposite to a first air inlet in the non-transmission end cover is formed in the side face, opposite to the outer end face of the non-transmission end cover, of the air duct. A second air inlet is formed in the end, close to the non-transmission end cover, of the top of the machine base and covered with a machine base air inlet cylinder. A water baffle is fixed to the lower portion of theair outlet in the machine base so that water waves can be prevented from splashing into the stator through the air outlet. According to the invention, the main generator with the open type self-ventilation structure meets the requirement of water wave prevention under the vehicle, so that the main generator can be pushed to move on the power dispersion type internal combustion motor car.

The invention discloses a ventilating slot structure of a generator rotor. The ventilating slot structure of the generator rotor comprises a slot bottom filler strip, a rotor winding, a filler strip under a wedge, a damping winding and a rotor slot wedge, wherein at least one channel forming radial ventilating with a vent hole is axially formed in the rotor winding, any two adjacent copper rows form the channel in the axial direction of the rotor winding, an air inlet in the lower part of the channel is slantly distributed in the direction of cooling air, a ventilating duct with an S-shaped cross section is at least arranged at the upper part of the channel, a plurality of copper wires in the axial direction of the copper rows at the upper part of the channel are distributed in a staggered manner, and any two adjacent copper rows form the S-shaped vent duct in the axial direction of the rotor winding. The air inlet in the lower part of the channel is slantly distributed in the direction of the cooling air, so that the air intake resistance of the air inlet of the channel is effectively reduced, the air intake flow rate of the cooling air entering the channel is increased, the cooling air entering through the air inlet in the lower part of the channel enters the S-shaped vent duct to form turbulent flow, so that the ventilating and cooling effects are greatly improved.

An outdoor laser lamp includes a housing, a laser and a circuit board disposed inside the housing, and a lower mounting plate. A periphery of the lower mounting plate is in contact with an inner wall of the housing, a laser and a circuit board are located between the lower mounting plate and the top of the housing. Air vents are on the bottom of the housing; through holes are on the lower mounting plate, a raised ring wall surrounds each through hole and extends towards the bottom of the housing. The laser lamp realizes air circulation between outside air and the interior of the housing, realizes rapid heat dispersion of the laser lamp to ensure the functionality of the laser lamp. Additionally, it prevents water entering the space where the circuit board is arranged, to avoid the influence on the internal circuits by water.

The present invention provides a motor with good ventilation properties. The motor comprises a motor winding. Each two adjacent teeth of the motor winding are provided with a ventilation channel. The technical points of the ventilation channel are that: a near shaft of the ventilation channel is arranged between two adjacent teeth of the motor winding, the remote shaft is extended to the outside of the motor winding, and deflected to one side to form a ''>'' type with the near shaft, and a prism are arranged between two adjacent shafts of the ventilation channel. According to the motor with good ventilation properties disclosed by the present invention, the ''>'' type formed by reverse deflection of the remote shaft and the near shaft of the ventilation channel is used to change a flow direction of the gas inside the motor, so that ventilation of the gas inside the motor is improved, convection is enhanced, and an effective cooling purpose is reached; and the prism is further added between the remote shaft of the ventilation channel to change flow condition of the fluid, thereby reducing eddy current losses, and enabling a flow form of the fluid to be better.

The invention discloses an integrated process method of a host heel block and a ventilating box. According to electric generator structure features of a large air cooling steamer and ventilating cooling performance requirements of a type experiment, an integrated structure design is performed on the host heel block used by the type experiment and the ventilating box, a steamer electric generator,a cooler, the host heel block, a wind shield, a wallboard and a supporting beam are utilized to construct a fully enclosed self-circulation ventilating system of the electric generator of the coolingsteamer, the supporting stability requirements of a stator are met, the problem that the requirements to the ventilating cooling performance of the electric generator of the cooling steamer are high is solved, and it is finally ensured that the type experiment data of the electric generator of the steamer is accurate and reliable.

The invention discloses a variable frequency motor used for a pump. The variable frequency motor is mainly composed of a rotating shaft, a machine seat, a stator iron core, a rotor, a stator winding, a flexible coupling, an encoder and an axial-flow fan. The axial-flow fan is installed in a fan housing. The fan housing is fixed on a rear end cover through screws. The rear end cover is further provided with the flexible coupling and a support. The support is provided with the encoder. The encoder feeds running information collected by the flexible coupling back to an external controller through a data and instruction transmission line, then the controller calculates corresponding running data and sends out an instruction to a frequency converter, and the frequency converter controls the rotor to rotate. The variable frequency motor used for the pump has the advantages that the driving performance is highly efficient, the control characteristic is good, the encoder is arranged to realize frequency-conversion speed-regulation controlling over a feedback vector closed loop, the axial-flow fan is independently arranged to improve the ventilation and cooling effect during low-speed running, the noise is low, the vibration is slight, and the variable frequency motor has a good development prospect in application to a pump system controlled in a frequency-conversion speed-regulation manner.

The invention discloses a Bluetooth headset mainboard with a noise reduction structure and capable of shielding noise, and relates to the field of Bluetooth headset mainboards, the Bluetooth headset mainboard comprises a mainboard body and a low-noise heat dissipation mechanism, a heat dissipation roller is transversely arranged on the front surface of the mainboard body in a penetrating manner, and the low-noise heat dissipation mechanism is mounted in the middle of the front surface of the heat dissipation roller. The technical problems that when an existing Bluetooth headset main board works, due to interference of various kinds of noise in the external environment, sound needing to be received can be interfered, the noise reduction effect cannot meet the requirement, and meanwhile the defect that the operation efficiency of the main board is affected due to the poor heat dissipation effect exists are solved. According to the Bluetooth headset mainboard with the noise reduction structure and capable of shielding noise, the sound receiving device is independently arranged on the right side of the mainboard, the partition plate made of the copper-nickel-copper material is attached to the left side of the shell, mutual interference between the sound receiving device and other signal sources is effectively shielded, and the problems that an existing Bluetooth headset mainboard has call noise, is poor in GPS antenna signal and the like are solved.

The invention discloses a processing technology of soft anti-fading jean. The technology includes the steps of preparation of warp, preparation of weft and preparation of the jean. The technology hasthe advantages that the jean processed through the technology has an excellent anti-fading effect, and is good in air permeability and cooling performance, soft in hand feeling and comfortable to wear; the preparation process is simple, the cost is low, the automation degree is high, and the prepared jean is attractive in appearance and stable in quality; fiber resources are fully utilized in theprocess, and the requirements for environmental protection is met; active polypeptide added in the preparation process of mica modified fiber has a synergistic effect with mica, the content of amorphous regions of the fiber is increased, the orderliness of arrangement of fiber molecules is reduced, the porosity of the fiber is increased, entering of dyeing molecules is facilitated, and the color fastness is improved.

The invention discloses a ventilation cooling device for a transformer substation. The device comprises a transformer substation body. A cooling fan is mounted in the transformer substation main body.Ventilation openings are formed in the upper end of the substation body. One end of the ventilation opening is connected with the cover plate through a hinge. A first air blowing pump is mounted on one side of the transformer substation main body. One end of the first blast pump is communicated with the substation main body through a first pipeline. A second air blowing pump is installed on the other side of the transformer substation body, one end of the second air blowing pump is communicated with the interior of the transformer substation body through a second pipeline, the first pipelineis communicated with the second pipeline through a circulating pipeline, an adjusting valve is arranged on the circulating pipeline, and one end of the circulating pipeline is connected with the transformer substation body through an air blowing branch pipe. According to the invention, multi-pipeline control ventilation is carried out inside the transformer substation, so that air circulation among pipelines can be adjusted, and the advantages of energy conservation and convenient control are achieved.

The problems of an existing high-power LED illumination lamp and chip heat radiation are the technical key point, if the heat radiation is poor, the LED service life is directly influenced, the light failure is accelerated, and the LED lamp service life is shortened, so that the upper portion of an LED lamp is provided with a large aluminum alloy die-casting heat radiation sheet. A high-power LED illumination lamp mainly consists of a heat-conducting piece (10) and an LED lamp (11). A conventional heat radiation technology is overturned, and the super-high temperature difference of a tornado in the meteorology is utilized to produce the rotating and rotating-superimposing effects in the tornado by adopting a man-made method, so that the air flowing speed is greatly accelerated only by giving slight initiative convection flows, good heat radiation effect is achieved, the high-power LED illumination lamp is good in quality and competitive in price, a built-in drive enables replacement of indoor and outdoor illumination lamps to be very simple, easy and convenient like common lamp replacement, the built-in drive and the lamp are alternatively combined through intelligent control, energy is saved, the structure and the LED service life are prolonged, and a method is ingenious, simple and scientific.

The invention provides a multi-layer impact non-ferrous metal fine grinding machine, and relates to the field of non-ferrous metal grinding machinery, in particular to a multi-layer impact non-ferrousmetal fine grinding machine. The invention provides a multi-layer impact non-ferrous metal fine grinding machine with simple structure, high efficiency and energy saving, and good grinding effect. The machine comprises a cylindrical grinding machine body. The top of the grinding machine body is provided with an upper bearing seat cover, and the bottom part is provided with a lower bearing seat. The upper bearing seat cover is provided with a feeding port, and the lower bearing seat is provided with a discharging port. The center of the grinding machine body is provided with a rotating shaft which rotates and moves. The rotating shaft is provided with a plurality of hammer seats. The hammer seats are connected with a plurality of hammers. The inner wall of the grinding machine body is provided with wear-resistant lining plates. The rotating shaft is provided with a spreading disc, and the spreading disc is located above the uppermost hammer seat on the rotating shaft. The spreading disc is uniformly provided with a plurality of grinding bodies on the circumference of the top surface. The fine grinding machine is convenient to process and operation is reliable.

The invention discloses a ventilation and cooling device for a cattle farm. The device relates to the technical field of equipment for animal husbandry and culture, and comprises a farm house, whereina partition board is fixedly mounted in the farm house; round holes are formed in the bottom of the partition board; a house cover is fixedly mounted at the top of the farm house; a baffle plate withone end extending to be fixedly connected with the top of the partition board is fixedly mounted on the top wall of the inner cavity of the house cover; a first mounting seat is fixedly mounted on the left side of the house cover; a first fan is fixedly mounted at the top of the first mounting seat; a first air suction pipe with one end extending to the inside of the house cover is communicated to the right side of the first fan; and a first air outlet pipe is communicated to the left side of the first fan. The ventilation and cooling device for the cattle farm solves the problem that due tothe poor effect of most ventilation and cooling devices and the number of cattle is large in the cattle farm, so as to enable the inner temperature to be relatively high, so that the traditional cattle farm has certain influence on the health of cattle.

The invention discloses a minitype wireless repeater with a good radiating effect. The minitype wireless repeater comprises a repeater box body, a regulation and control mounting plate is fixedly arranged at one end of the repeater box body, and the other end of the repeater box body is connected with a fixed plate; a mounting notch is formed in the middle of the fixed plate, and a radiating fan is fixedly connected in the mounting notch; a protective cover plate is placed just above the repeater box body, and radiating vent holes are annularly arranged at the periphery of the side of the protective cover plate, a groove is symmetrically formed at the inner side of the protective cover plate, and a first magnet block is clamped into the groove. Through the minitype wireless repeater with good radiating effect disclosed by the invention, the internal heat is dissipated in an acceleration manner from the cooling fins; the radiating vent holes communicating with the internal of the repeater box body are uniformly distributed at the periphery of the side of the protective cover plate, the radiating is uniform and comprehensive; and the heating problem in the box body is further balanced under the effect of the radiating fan in the middle of the fixed plate, and the use effect is good.

The invention relates to an ignition device of a small gasoline engine generator. The ignition device comprises a rotor and a gasoline engine box body. The rotor is mounted in the gasoline engine box body. The ignition device is characterized in that small magnetic steel is embedded in the outer side of the circumference of the rotor; a Hall element inductor is mounted at the position, corresponding to the small magnetic steel, of the inner side of the gasoline engine box body; and the small magnetic steel and the Hall element inductor cooperate to generate induction signals used for controlling an ignition system of a gasoline engine to carry out ignition. According to the ignition device, the small magnetic steel is embedded in a rotor shell body; the Hall element inductor is mounted at the corresponding position of the gasoline engine box body, when the rotor operates till the small magnetic steel coincides with the Hall element inductor, the Hall element inductor can generate an ignition signal, and therefore the aim of controlling ignition is achieved; and due to the fact that the size of the small magnetic steel and the size of the Hall element inductor are small and the small magnetic steel is embedded in a rotor shell, no size is occupied, no wind is blocked, and the ventilating and cooling effects are good.