35results about How to "Guaranteed air flow" patented technology

The invention discloses a flame spread simulation experiment system comprising an experiment table which is used for simulating combustion flame spreading of a solid combustible and a control terminalwhich is used for automatically recording and controlling working of the experiment table. The experiment table comprises an air humidifying chamber, a combustion chamber and a smoke collecting chamber which are connected in turn. The combustion chamber is internally provided with a rotating support and an electronic scale. The top part of the combustion chamber is provided with a radiation plate. The bottom part of the smoke collecting chamber is provided with a smoke particle collecting plate. The top part of the smoke collecting chamber is provided with an exhaust fan and a laser smoke analyzer. The air humidifying chamber is externally provided with a blower which blows the wet air generated by the atomizer to the solid combustible. The combustion chamber is externally provided with ahigh-definition camera. The control terminal comprises an industrial control computer and a touch screen. The output end of the industrial control computer is connected with a blower driving module which is used for adjusting the output volume of the blower. The structure of the material is not destroyed when the solid combustible is fixed so that the influence of the radiation intensity, the inclination angle, the wind velocity and the air humidity on flame spreading can be determined and the smoke component can be analyzed in real time.

The invention discloses a wind driven generator. A gear box lubricating and cooling system comprises a common radiator and an auxiliary radiator which are arranged on a fan gear box lubricating oil way. An axial flow fan is arranged on the outer wall of a tower and / or a wind driven generator room, and introduces low-temperature air outside into the tower and / or the wind driven generator room. According to the wind driven generator, because the auxiliary radiator is added into the gear box lubricating and cooling system, the heat exchange area of a radiator assembly is increased, and the heat exchange capability of the radiator assembly is improved; because the low-temperature high-flow air outside is introduced into the wind driven generator room in a forced mode through the axial flow fan, the environment temperature inside the wind driven generator room is controlled, the heat exchange capability of the air-cooling radiators of the lubricating and cooling system is improved, and it is guaranteed that the whole fan can generate power normally with full power.

The invention relates to the field of indoor air purification devices, in particular to a cleaning assembly for a ventilation pipeline of an indoor air purification device, which comprises a main body, an opening and closing mechanism, a filtering mechanism, a limiting mechanism, a cleaning mechanism and an auxiliary mechanism. By arranging the filtering mechanism, the quality of air entering a room can be guaranteed, filtering accessories such as a filter element are convenient to replace, the using effect of the device is improved, the filtering mechanism is convenient to open and close automatically by arranging the opening and closing mechanism, and the replacement efficiency of the filtering mechanism is improved in an assisted mode. By arranging the cleaning mechanism, the inner wallof the pipeline can be conveniently and automatically cleaned, manpower and time are saved, the cleaning efficiency is improved, by arranging the limiting mechanism, dust filtering components can beconveniently replaced, airflow circulation in the main body is guaranteed, dust is prevented from entering the device, and the cleanliness of the interior of the device are guaranteed; Through the arrangement of the auxiliary mechanism, the filtering part is conveniently limited and fixed in an auxiliary manner and is prevented from accidentally separating from a limiting position.

The invention discloses a fuel cell engine air supply system. The air supply system comprises a fuel cell stack, a gas supply main path, an exhaust main path, an air supply bypass branch and a drivingmotor; one end of the gas supply main path is connected with a cathode inlet of the fuel cell stack, the other end of the gas supply main path is communicated with the external environment, and a gascompressor is arranged on the gas supply main path; one end of the exhaust main path is connected with a cathode outlet of the fuel cell stack, the other end of the exhaust main path is communicatedwith the external environment, and a turbine is arranged on the exhaust main path; one end of the air supply bypass branch is connected with the air supply main path, the connecting point is located behind the air compressor, the other end of the air supply bypass branch is connected with the exhaust main path, the connecting point is located in front of the turbine, and a bypass valve is arrangedon the air supply bypass branch; and one end of an output shaft of the driving motor is connected with the air compressor, and the other end of the output shaft of the driving motor is connected withthe turbine. The air supply system can recover the exhaust energy of the fuel cell, and meanwhile surge of the air compressor is avoided.

The invention belongs to the field of textile processing, and provides a carding machine cover plate. The carding machine cover plate comprises a gagger and a cover plate needle gear arranged on the gagger, multiple through holes are formed in a toe-end and heel-end of the gagger, one side, away from a cylinder, of the gagger is provided with an air suction device and a blowing device, the air suction device covers the through holes of the toe-end of the gagger, the blowing device covers the through holes of the heel end of the gagger, and the air suction device and the blowing device performairflow action on fibers on the cover plate needle gear through the through holes. The invention further provides a carding machine by using the carding machine cover plate and a method for flexible carding spinning by using the carding machine cover plate. The carding machine cover plate, the carding machine using the carding machine cover plate and the method for flexible carding spinning can effectively reserve the length of the fibers, improve the quality of the carding machine, promote the repeated transfer of the fibers among needle faces, improve free carding efficacy, improve the effect of fiber carding, strengthen carding, and reduce the fiber damage.

The invention relates to the technical field of communication equipment, and discloses a placement cabinet for communication equipment, which comprises a dust removal device. The bottom part of the dust removal device is fixedly connected with a cabinet body; the bottom part of the cabinet body is fixedly connected onto the top part of a body; the inner wall of the bottom part of the dust removaldevice is fixedly connected with a gathering body; one side of the gathering body is movably provided with a mounting sleeve; one side of the mounting sleeve is fixedly connected with a dust dischargepipe; one side of the dust discharge pipe is fixedly connected with a dust collection machine; the bottom part of the dust collection machine is fixedly connected onto the inner wall of the bottom part of the dust removal device; the input end of the dust collection machine is fixedly connected with a dust collection pipe; one end of the dust collection pipe sequentially passes through the dust removal device and the cabinet body and is communicated with dust collection heads. Through match between the dust collection machine and the gathering body, accumulation of dust inside the placement cabinet can be effectively reduced, influences of the dust on the communication equipment are effectively reduced, the use efficiency of the communication equipment is greatly enhanced, and the workingefficiency of personnel is effectively improved.

The invention discloses a sand filtering device for a building. The sand filtering device for the building comprises a machine body, a feeding hopper is rotationally connected to the top of the machine body, a conical screen is fixed to the bottom of the feeding hopper, an impurity storage cavity is fixed to the bottom of the conical screen, the surface of the impurity storage cavity is rotationally connected with the bottom of the machine body, a spiral blade is located in the conical screen and fixed to the bottom of the feeding hopper, a cleaning device is arranged on the surface of the conical screen, a pressing device is arranged on the inner wall of the machine body, a flow guide plate is fixed to the inner wall of the machine body and close to the bottom of the machine body, and a filter sieve is fixed to the bottom of the inner wall of the machine body. The invention relates to the technical field of building equipment. According to the sand filtering device for the building, the purpose of removing impurities in time is achieved, the impurities can be removed in time, impact generated after the impurities are thrown out is avoided, the service life of equipment is prolonged, meanwhile, wet sand balls are scattered in time, filtering is facilitated, and the working efficiency and the using performance are improved.

The invention discloses an intelligent household safe full-automatic fire extinguishing device. The device comprises an electrical appliance body, wherein a sealing baffle is laterally fixed at the lower end of the electrical appliance body; an electrical element is arranged in the electrical appliance body at the lower end of the sealing baffle; an air hole penetrates through the electrical appliance body at the lower end of the sealing baffle; a sealing cover plate is movably arranged on the inner wall of the electrical appliance body; the sealing cover plate movably covers on the air hole;a sealing strip is fixed at the inner end of the sealing cover plate. When electrical equipment is normally used, the fact that the temperature in a working area of the electrical element is not too high can be guaranteed through the air hole, and the equipment can be normally operated, when the electrically element is aged and causes a fire, the sealing cover plate can automatically seal the airhole, so as to ensure that the electrical appliance body at the lower end of the sealing baffle is positioned in sealed space, and flame produced by the electrically element can be automatically extinguished because oxygen is insufficient, so that the effect of automatic fire extinguishing is achieved.

The invention discloses a petroleum gas steel bottle control valve with quick gas filling and reliable sealing. The valve comprises a hollow valve body, a compression rod and a gas inlet; a first closing port is formed in the hollow valve body; a lifting sleeve with the resetting function is inserted into the hollow valve body; a gas filling passage for communicating the gas inlet with a petroleum gas steel bottle inner cavity is formed between the hollow valve body and the lifting sleeve; the outer wall of the lifting sleeve is provided with a first sealing ring in matched seal with the closing port; a second closing port and a lifting plunger piston which is matched with the compression rod and has the resetting function are arranged in the lifting sleeve; the lifting plunger piston is provided with a second sealing ring in matched seal with the second closing port; a gas outlet passage communicated with the petroleum gas steel bottle inner cavity is formed between the lifting sleeve and the lifting plunger piston; and the top of the lifting sleeve extends upwards to a gas outlet and the edge of the top is provided with a guide sliding chamfer angle.

The invention relates to a wind scooper and a vehicle with the same. The wind scooper comprises a wind guiding cavity body extending in the front-back direction. A front end inlet for being tightly attached to a separation face to enable airflow to enter the wind guiding cavity body and a rear end outlet for being tightly attached to the wind inlet face of a vehicle-mounted energy box are formed in the wind guiding cavity body. An installation structure for installing a vehicle frame is further arranged on the wind guiding cavity body. The wind guiding cavity body occupies the space between the vehicle-mounted energy system box and the separation face of a hyperbaric cabin. Cooling airflow enters the wind guiding cavity body from the separation face and then is led into the vehicle-mounted energy system box along a directional air flue formed by the wind guiding cavity body, the amount of airflow led into the vehicle-mounted energy system box is ensured, and the cooling effect of the vehicle-mounted energy system is improved, so that the problems that the cooling effect of the vehicle-mounted energy system is poor in effect due to the fact that the distance between the installation position of the vehicle-mounted energy system and the separation face of the hyperbaric cabin is small, a flexible soft catheter cannot be used, and cooling airflow cannot be led into the vehicle-mounted energy system box through the directional air flue which is hard to form are solved.

The invention, which belongs to the technical field of dust measurement, discloses a portable resistance-capacitance-method-based on-line measurement device and method for a dust moisture content. Oneend of a probe rod of the measurement device is connected to a housing; and a humidity sensor is disposed inside the probe rod. A first filter layer and a second filter layer are disposed at one end,away from the housing, of the probe rod; and a heating film is laid on the inner wall of the probe rod. The first filter layer uses an electrostatic filter net; and the second filter layer uses a Si02-PTFE membrane filter material. The heating film is adhered to the inner wall of the probe rod by an adhesive; and the substrate of the heating film is a high-temperature-resistant polyester film. The conductor in the heating film is made of grapheme; and the heating film is directly connected to a power source through a wire. A water-cooled assembly is arranged in the housing; water in a water tank and a water-cooled sleeve in the water-cooled assembly flows circularly, so that the temperature of the flue gas is reduced. On the basis of different dust characteristics, comprehensive development is preformed; and the moisture contents of thermal power plant dust and mine dust can be measured. The on-line measurement device and method have advantages of fast response speed, high measurementaccuracy and high versatility.

The invention discloses an engineering vehicle cooling system with an exhaust injection cooling device, comprising a main cooling system and an auxiliary cooling system, wherein the main cooling system comprises a fan driven by an engine or a hydraulic motor and at least one or a combination of several modules of a water radiator, a hydraulic oil radiator, a transmission oil radiator and an air-air intercooler which are high in heat dissipation power; and the auxiliary cooling system comprises an exhaust injection system, an electronic fan and at least one or a combination of several modules of an air conditioner condenser, a fuel oil cooler and the like which are small in heat dissipation power. Air drive force needed by heat dissipation of the auxiliary cooling system is mainly providedby the exhaust injection system, so that the electronic fan can operate only when the drive force is insufficient, the drive force is compensated, and drive force is guaranteed to be continuous and sufficient. The engineering vehicle cooling system can meet heat dissipation requirement of a cooling system, also can save power consumption of the fan, and reduces noises.

The invention discloses a safe and environment-friendly power electrical cabinet device, and belongs to the technical field of power equipment. The device comprises a box body, and is characterized inthat a plurality of clamping plates which are uniformly distributed are arranged on the outer side of the box body; an air inlet hole is formed in one side of the box body, a dust filtering plate isarranged on one side of the air inlet hole, a fan exhaust port is formed in one side of the box body, a fan is arranged in the fan exhaust port, a dustproof plate is arranged on one side of the box body, and a plurality of uniformly distributed handles and a solar panel are arranged at the top end of the box body. The safe and environment-friendly power electrical cabinet device can prevent external dust particles from entering a box body, can well dissipate heat and is convenient to disassemble.

The invention discloses an electronic stop board adopting graphene for heat dissipation. The stop board comprises a base, a stop board main body is fixedly connected to the top of the base, a displayscreen body is embedded in the front surface of the stop board main body, a loudspeaker is embedded in the top of the front surface of the stop board main body, a cavity is formed in the stop board main body, and four first mounting inner studs are fixedly connected to the front side of an inner cavity of the cavity. The electronic stop board solves the problem that a display on an electronic stop board is provided with a main board, a chip on the main board is used for main information processing, and during main board working, the chip can generate a large amount of heat, however, the purpose of heat dissipation of the chip on the main board is achieved in the mode that an aluminum sheet conducts heat, and the heat dissipation effect is poor, although a filter screen is arranged at theposition used for air inlet and air outlet, filter holes in the filter screen can be blocked due to too much external dust after long-time use, and heat dissipation of the chip on the main board is seriously affected.

The invention discloses a spreading clothes hanger, which comprises a clothes hanger body. A rotatable bracket is arranged under the body, and an interference fit is adopted at the connecting position; at least one cross strip is arranged in the rotatable bracket; and in order to improving the integral strength of the clothes hanger, the body and the bracket have an I beam structure respectively. After clothes are put into the clothes hanger, the bracket is poked to rotate 90 degrees from the horizontal position to a position parallel to the ground and vertical to the clothes hanger body, and the clothes to be aired are spread, so that the ventilated circulation is facilitated and the speed of airing the clothes is improved. When the clothes hanger is not used, the bracket is poked to rotate 90 degrees from the horizontal position to return to the position parallel to the clothe hanger body; and when the clothes hanger is used in a wardrobe, more than three pairs of trousers can be put on the three airing cross strips of the rotatable bracket in an opposite folding form, and the rotatable bracket is positioned at the position parallel to the clothes hanger; therefore, the trousers can keep good storage state and do not occupy an overlarge area in the wardrobe.

The invention discloses a compressed natural gas releasing device and a power generation method employing pressure potential. The compressed natural gas releasing device comprises a compressed natural gas heat exchange filtering device, wherein the back of the compressed natural gas heat exchange filtering device is connected with power generation device components, and the compressed natural gas heat exchange filtering device is arranged between two voltage regulators, and releases pressure in a pipeline through a releasing pipeline. The problem that compressed natural gas equipment completely depends on an electric network is solved, and the purpose that the compressed natural gas equipment can employ own compressed natural gas differential pressure for power generation is realized.

A brush holder structure used for an AC generator comprises a brush holder body and a carbon brush protection cover, the upper end of the brush holder body is provided with a concave cavity, the upper end and the front end of the concave cavity are open, the carbon brush protection cover covers the upper end of the brush holder body, and the front end of the carbon brush protection cover is provided with a cylinder corresponding to the opening in the front end of the concave cavity. The cylinder is used for allowing a collecting ring of the alternating current generator to be inserted, the left side and the right side of the carbon brush protection cover extend downwards respectively, openings are reserved between the carbon brush protection cover and the left side and the right side of the brush holder body respectively, an exhaust channel is formed between the carbon brush protection cover and the brush holder body, and two guide grooves vertically extending upwards are formed in the brush holder body. Each guide groove is respectively communicated with the concave cavity, a compression spring is respectively matched in each guide groove in a sliding manner, the upper end of each compression spring is respectively provided with a carbon brush, the two carbon brushes respectively extend into the concave cavity to correspond to the collector ring, and the carbon brushes are respectively provided with a brush braid.

The invention provides a computer heat dissipation base based on a crosswind vertical blowing technology, and is particularly applied to the technical field of computer heat dissipation. The device comprises a base, a storage cavity is formed in the top end of the base, a plurality of blowing holes are evenly connected to the bottom ends of the left side end and the right side end of the storage cavity in a penetrating mode, an air driving mechanism is arranged in an inner cavity of each blowing hole, and a filter cylinder is inserted into the end, away from the storage cavity, of each blowinghole. The wind driving mechanism comprises an outer frame and an air suction fan, the outer frame is of a circular ring structure, and the air suction fan is fixedly connected to the inner cavity wall of the outer frame through a connecting rod; External air is dragged by the air suction fan to enter the air blowing hole through the filter cylinder. The air flow directly blows the bottom end of the notebook computer upwards under the action of the baffle table to dissipate heat of the notebook computer, and due to the fact that the air suction fan is arranged in the horizontal direction, compared with a fan and an air suction fan arranged in the vertical direction, the air suction fan is not affected by shielding of a table top, the air dispelling effect is guaranteed, and air flow is guaranteed.

The invention discloses a portable resistance-capacitance method on-line measuring device and method for dust moisture content, belonging to the technical field of dust measurement. One end of the probe rod of the measuring device is connected with the casing, and the humidity sensor is arranged inside the probe rod; the first filter layer and the second filter layer are arranged on the end of the probe rod away from the casing, and the heating film is laid on the inner wall of the probe rod; the The first filter layer adopts electrostatic filter screen, and the second filter layer adopts SiO 2 ‑PTFE film-coated filter material, the heating film is bonded to the inner wall of the probe rod through an adhesive; the base material of the heating film is a high temperature resistant polyester film, the conductor in the heating film is graphene, and the heating film is directly connected to the power supply through a wire . There is also a water-cooling component in the shell. The water in the water-cooling component and the water in the water-cooling jacket circulates, which can effectively reduce the temperature of the flue gas. The measuring device is comprehensively developed for different dust characteristics. It can measure the moisture content of thermal power plant dust and mine dust. It has the advantages of fast response speed, high measurement accuracy and high versatility.

The invention relates to the technical field of communication equipment, and discloses a placement cabinet for communication equipment, which comprises a dust removal device. The bottom part of the dust removal device is fixedly connected with a cabinet body; the bottom part of the cabinet body is fixedly connected onto the top part of a body; the inner wall of the bottom part of the dust removaldevice is fixedly connected with a gathering body; one side of the gathering body is movably provided with a mounting sleeve; one side of the mounting sleeve is fixedly connected with a dust dischargepipe; one side of the dust discharge pipe is fixedly connected with a dust collection machine; the bottom part of the dust collection machine is fixedly connected onto the inner wall of the bottom part of the dust removal device; the input end of the dust collection machine is fixedly connected with a dust collection pipe; one end of the dust collection pipe sequentially passes through the dust removal device and the cabinet body and is communicated with dust collection heads. Through match between the dust collection machine and the gathering body, accumulation of dust inside the placement cabinet can be effectively reduced, influences of the dust on the communication equipment are effectively reduced, the use efficiency of the communication equipment is greatly enhanced, and the workingefficiency of personnel is effectively improved.

The invention discloses a petroleum gas steel bottle control valve with quick gas filling and reliable sealing. The valve comprises a hollow valve body, a compression rod and a gas inlet; a first closing port is formed in the hollow valve body; a lifting sleeve with the resetting function is inserted into the hollow valve body; a gas filling passage for communicating the gas inlet with a petroleum gas steel bottle inner cavity is formed between the hollow valve body and the lifting sleeve; the outer wall of the lifting sleeve is provided with a first sealing ring in matched seal with the closing port; a second closing port and a lifting plunger piston which is matched with the compression rod and has the resetting function are arranged in the lifting sleeve; the lifting plunger piston is provided with a second sealing ring in matched seal with the second closing port; a gas outlet passage communicated with the petroleum gas steel bottle inner cavity is formed between the lifting sleeve and the lifting plunger piston; and the top of the lifting sleeve extends upwards to a gas outlet and the edge of the top is provided with a guide sliding chamfer angle.

The invention discloses an efficient salt mist testing machine for parts of fitness equipment. The efficient salt mist testing machine comprises a base plate, a testing machine box and a control machine box, the testing machine box is fixedly arranged on the left side of the upper part of the base plate, a testing box cover is arranged at the upper end of the testing machine box and is connected to the testing machine box through a hinge shaft in a hinged mode, protrusions are arranged at the left end and the right end of the testing box cover separately, lifting air cylinders which are fixedly connected to the protrusions are arranged at the left end and the right end of the testing machine box separately, a dry-bulb temperature thermometer and a wet-bulb temperature thermometer are arranged on the left side and the right side of the middle of the front surface of the testing machine box separately, a loading plate is arranged at the upper part of the interior of the testing machine box, collecting hoppers are arranged on the left side and the right side of the upper part of the loading plate, a spraying tower is arranged in the middle of the upper part of the loading plate, the bottom end of the spraying tower penetrates through the loading plate to be connected to a water pump, and the lower end of the water pump is connected to a brine tank. The efficient salt mist testingmachine has the advantages of being simple in structure, high in practicability, high in safety, good in testing effect, high in accuracy and beneficial to popularization.

The invention discloses a ventilation system capable of achieving a constant air outlet state and a ventilation unit, and belongs to the technical field of ventilation systems. The ventilation system comprises a ventilation host, a fresh air inlet channel and a dirty air outlet channel are arranged on the two sides in the ventilation host respectively, draught fans are fixedly installed on the rear side in the fresh air inlet channel and the front side in the dirty air outlet channel respectively, a current detection unit which is used for detecting the current values of the draught fans and a control unit which is used for judging and adjusting the current values of the draught fans are further fixedly installed on one side of the ventilation host, and a plurality of filter screens are installed on the front side in the fresh air inlet channel at equal intervals through a lower filter screen installation frame and an upper filter screen installation frame and used for carrying out multiple filtering on impurities in fresh air. According to the ventilation system, the ventilation quantity of fresh air entering the plurality of filter screens in the channel is maintained through washing, the current values of the draught fans are detected and judged, then the power of the draught fans is adjusted to be constant, and finally the fresh air outlet quantity of the ventilation system is constant.

A biomass fuel furnace relates to combustion equipment and comprises a furnace body, a furnace pipe and a furnace table, wherein the side wall of the furnace pipe comprises an inner layer and an outer layer, plural air exhaust holes are disposed in the outer layer, plural air ducts extended and disposed from bottom to top are disposed between the inner layer and the outer layer, and the air exhaust holes are upper ports of the air ducts; and the outer surface of the outer layer is winded by a heating pipe. The biomass fuel furnace provided by the invention has the beneficial effect that when wind enters the furnace body, one part of the wind directly enters the furnace pipe to realize sustained combustion of fuels; and the other part of wind enters the air ducts and then flees from the air exhaust holes into the middle upper part of the furnace pipe. When the wind in the air ducts flees into the furnace pipe, flame gets close to the center shaft of the furnace pipe and is avoided from running around. After multiple air flows gather inside the furnace pipe, wind speed above the furnace pipe increases, air mobility in the fuel furnace is ensured, and the fuels can be completely burnt; and heat of the side wall of the furnace pipe is used to heat a water flow in the heating pipe so as to add functions of the fuel furnace and increase utilization rate of the heat.

The invention relates to a wind scooper and a vehicle with the same. The wind scooper comprises a wind guiding cavity body extending in the front-back direction. A front end inlet for being tightly attached to a separation face to enable airflow to enter the wind guiding cavity body and a rear end outlet for being tightly attached to the wind inlet face of a vehicle-mounted energy box are formed in the wind guiding cavity body. An installation structure for installing a vehicle frame is further arranged on the wind guiding cavity body. The wind guiding cavity body occupies the space between the vehicle-mounted energy system box and the separation face of a hyperbaric cabin. Cooling airflow enters the wind guiding cavity body from the separation face and then is led into the vehicle-mounted energy system box along a directional air flue formed by the wind guiding cavity body, the amount of airflow led into the vehicle-mounted energy system box is ensured, and the cooling effect of the vehicle-mounted energy system is improved, so that the problems that the cooling effect of the vehicle-mounted energy system is poor in effect due to the fact that the distance between the installation position of the vehicle-mounted energy system and the separation face of the hyperbaric cabin is small, a flexible soft catheter cannot be used, and cooling airflow cannot be led into the vehicle-mounted energy system box through the directional air flue which is hard to form are solved.

The invention discloses a gas film damping fan blade with a vibration absorption sheet covered by throttling orifices. The gas film damping fan blade comprises a blade body, the vibration absorption sheet, a blade front edge and a blade disk; the blade body is of a large-size wide-chord raised-shoulder-free fan blade structure, which is connected with into a whole by conducting diffusion welding on a blade back and a blade basin; the lower end of the blade body is fixed to the blade disk; an open cavity is formed by extending from the front edge to the rear edge of the blade body at the middlepart of the blade back; the vibration absorption sheet is arranged on the open cavity; the blade front edge is arranged at the front edge of the blade body; and the lower end of the blade front edgeis fixed to the blade disk. The fan blade exists various vibration reduction energy dissipation mechanisms, the vibration reduction frequency domain range is wide, the application scope is wide, a gasfilm damping structure is easy to realize, and the vibration level of the fan blade can be inhibited effectively.

The invention discloses a four-piston air pump which has four suctions and four exhausts by rotating a motor for one cycle. The air pump comprises four cover plates, four air guide plates, a power assembly, a pump body, and a plurality of diaphragms for suction and exhaust. The power assembly is mounted in a motor mounting hole in the pump body, the four air guide plates are respectively attachedand assembled on four mounting surfaces of the pump body, and the four cover plates are respectively attached and assembled to the four air guide plates. During the process that the motor shaft rotates for one cycle, two transverse pump films perform one suction and one exhaust respectively, and two longitudinal pump films perform one suction and one exhaust respectively, Therefore, the pump has four suctions and four exhausts when the motor shaft rotates for one cycle. The common pump has only one suction and one exhaust when the motor shaft rotates for one cycle. The invention has the characteristics of high efficiency, larger exhaust flow amount, and the like.

The invention provides a multifunctional mosquito repelling bracelet which comprises a box body, a first ring belt and a second ring belt. The first ring belt is adhered to one side of the box body; the second ring belt is adhered to the other side of the box body; a buckle is formed in the first ring belt; a buckle is adhered to the bottom of the second ring belt; a box cover is mounted on the box body; a timer I is arranged on one side of the box cover; a timer II is arranged on the other side of the box cover; catches are mounted on the two sides of the box body; ring grooves are formed inthe first ring belt and the second ring belt; a capsule is clamped on the inner side of each ring groove; air guide openings are formed in the two sides of the box body. A switch I and a switch II aremounted on one side of the box body; the switch I is arranged on one side of the switch II, a charging port is formed in the bottom of the switch I, and air pipes are arranged at the bottoms of the box body, the first ring belt and the second ring belt. The multifunctional mosquito repelling bracelet is reasonable in design, convenient to use and suitable for being worn on the wrist for repellingmosquitoes during outdoor activities.