44results about How to "Meet heat dissipation" patented technology

The invention relates to the technical field of heat dissipating devices, in particular to an ultra-thin flat heat pipe and a manufacturing process thereof. A bottom plate and a cover plate which arebuckled and packaged are included, the bottom plate is provided with a cavity internally provided with a plurality of capillary structures arranged in parallel, gas flow channels for a heat pipe working medium to flow therein is formed between the adjacent capillary structures, and each capillary structure includes a plurality of liquid flow channels arranged in parallel. A gas working medium flows in the gas flow channels, and a liquid working medium flows in the capillary structures, so that gas-liquid separation of the working media is achieved, the flow resistance is reduced, and the heattransfer limit of the heat pipe is increased; and the ultra-thin flat heat pipe is simple in structure and easy to manufacture, can realize industrial production line production, has strong heat transfer capacity, is small in thickness of heat pipe, can meet the requirement for heat dissipation of electronic devices in a narrow space, meets the needs of integration and miniaturization of electronic components, and has good practicability and applicability .

The invention provides a preparation method of a liquid-state metal composite phase-change material and belongs to the field of shaped composite phase-change materials. The preparation method comprises the following steps: firstly, uniformly mixing water-soluble metal salt, carbon nanotubes and a polyvinylidene fluoride raw material which have different ratios; putting a mixture into a mold with aspecific shape and drying; finally, dissolving metal salt in the mold in hot water to obtain flexible carbon nanotube sponge with a specific shape; putting a prepared flexible carbon nanotube spongecarrier material and liquid-state metal into a vacuum environment by adopting a melting impregnation method; selecting proper temperature to melt a liquid-state metal core material; adsorbing and limiting the liquid-state metal core material into a pore channel by utilizing the pore channel of the flexible carbon nanotube sponge carrier material under a vacuum environment; then cooling to obtain the liquid-state metal composite phase-change material. According to the preparation method provided by the invention, CPU (Central Processing Unit) efficient heat dissipation in different temperatureranges can be realized; controllable equipment of a pore channel structure is realized through changing types and ratios of raw material; the packaged shaped composite phase-change material can solvethe short-circuit problem, caused by free flowing of liquid-state metal, of an electronic element circuit; meanwhile, dynamic heat dissipation of flexible electronic components also can be met.

The invention relates to the field of fan motor technology, and more particularly to a DC three-phase brushless motor for a household fan. The DC three-phase brushless motor includes a winding group, a magnetic frame, a bearing and a PCB, and also includes a magnet and a base. The magnetic frame is provided with a shaft core. The winding group is arranged on the shaft core. The magnetic frame is arranged on the outer surface of the winding group. The magnet is located between the magnetic frame and the winding group. The winding group is connected with the PCB. The base is arranged in the shaft core in a sleeving manner and in an inner hole of the winding group in a penetrating manner. One end of the base is in contact with the magnetic frame, and the other end of the base protrudes from the PCB. The bearing is arranged in the shaft core in a sleeving manner and mounted in the base. The invention is capable of converting an AC voltage of 220 V to a DC voltage of 5V, and ensures that the invention can be driven by the 5V voltage to achieve the running speed and air pressure and volume of an AC motor, thereby saving energy and also meeting the cooling effect.

Relating to the technical field of double-sided adhesive tapes, the invention specifically designs a heat dissipation double-sided adhesive tape. The heat dissipation double-sided adhesive tape comprises a thermal conductive PET substrate, a graphite layer, a silica gel layer, a ceramic layer, a first thermal conductive adhesive layer and a second thermal conductive adhesive layer. One surface ofthe thermal conductive PET substrate is compounded with the graphite layer, and the other surface is compounded with the silica gel layer, the silica gel layer is provided with the ceramic layer, thegraphite layer is provided with the first thermal conductive adhesive layer, and the ceramic layer is provided with the second thermal conductive adhesive layer. After adopting the technical scheme, the heat dissipation double-sided adhesive tape provided by the invention has a simple structure, through the graphite layer, the silica gel layer and the ceramic layer, the heat conduction and heat dissipation ability of double-sided adhesive tape can be effectively improved, and the thickness can meet the heat dissipation of highly integrated electronic products.

The invention provides a heat-conducting silica gel sheet for heat dissipation of a lithium battery of a new energy automobile and a preparation method thereof, belonging to the field of heat dissipation materials for lithium batteries. The heat-conducting silica gel sheet is prepared from the following raw materials in parts by weight: 30 to 40 parts of vinyl-terminated methyl silicone oil, 1 to3 parts of alpha,omega-hydroxyl-terminated polydimethylsiloxane, 2 to 5 parts of polymethylhydrosiloxane, 0.1 to 1 part of tetramethoxysilane, 20 to 30 parts of graphene doped boron nitride, 10 to 20parts of fumed silica, 1 to 5 parts of microcrystalline wax, 0.05 to 0.2 part of dibutyltin dilaurate, 5 to 10 parts of KH-570, 20 to 25 parts of methyl vinyl MQ silicon resin, 0.1 to 0.5 part of acetenyl cyclohexanol, 5 to 10 parts of allyl glycidyl ether, 1 to 2 parts of zinc dimethyldithiocarbamate, 0.01 to 0.02 part of a hydrosilylation catalyst and 100 to 200 parts of water. The heat-conducting silica gel sheet has good heat conduction performance, the heat conduction coefficient is larger than or equal to 7.21 W / (m.k), the insulation performance is excellent, the breakdown voltage is larger than or equal to 24.63 kV, and certain mechanical elasticity is achieved; and the heat conduction silica gel sheet is not prone to crushing and fracturing, and can meet the requirement for heat dissipation of the lithium battery of the new energy automobile.

The invention discloses an integrally formed radiator of a semiconductor light source lamp. The radiator comprises a substrate and a cup body, wherein the substrate and the cup body are integrally formed, a plurality of sheet strips are punched on the substrate, tail ends of the sheet strips are not disengaged from the substrate, strip-shaped holes are formed between the substrate and the sheet strips, and a light source is fixed to the substrate. The strip-shaped holes form circulation air holes or air discharge grooves of the radiator. A manufacturing method of the integrally formed radiator of the semiconductor light source lamp comprises the four steps of blanking, stretching, edge cutting and sheet strip punching. The radiator is simple in manufacturing process, easy to form and process at one time, little in amount of waste materials in the twisting process, high in material utilization rate and low in production cost; the radiator has a high heat conductivity coefficient and a good radiating effect and achieves radiating of the high-power LED lamp; the radiator is of a disc shape, the radiating sheet strips formed through punching and twisting are not disengaged from the substrate, and heat conduction is facilitated.

The invention discloses a boss-type metal-based sandwich rigid-flex plate and a production method thereof. The rigid-flex plate comprises rigid sub plates, flex sub plates, medium layers and a metal core layer. At least one metal boss and at least one cooling area are arranged on each of the front side and the reverse side of the metal core layer. The medium layers and the rigid / flex sub plates are stacked sequentially on the front side and the reverse side of the metal core layer respectively. First opening areas matched with the metal bosses and second opening areas corresponding to the cooling areas are arranged on each of the rigid sub plate, the flex sub plate and the medium layer. The boss-type metal-based sandwich rigid-flex plate produced by the production method is cooled by the metal core layer (provided with the metal bosses on the front and the reverse sides); through the cooling mode good in reliability, cooling requirements of both partially-heating electronic components (through the metal bosses) and high-density circuits during working (through the metal core layer and the cooling areas) can be met.

The present invention relates to a computer temp.-controlled equipment and its method. Said method includes the following steps: utilizing PU temp. fetch device to fetch CPU temp. at regular time, using control device to compare said temp. with temp. threshold value, according to the compared result outputting two temp. control voltage signals, the fan control device of CPU can utilize one voltage signal to regulate CPU fan rotating speed, at the same time utilizing a selector to selectively output temp. control voltage and higher voltage selected from voltages correspondent to power supply temp. measured by temp.-measuring device in the power supply interior, and utilizing power supply fan rotating speed control device and outputted higher voltage to control power supply fan rotating speed.

The invention relates to a novel high-power integrated LED bulb lamp. The novel high-power integrated LED bulb lamp consists of a lamp housing, an integrated LED chip set, a solder and a circuit board, a ceramic chip, a synthesized ejector and a ceramic radiating cover, wherein the ceramic chip and the ceramic radiating cover are used as a ceramic radiating part; and the synthesized ejector is mounted at the bottom of the ceramic radiating chip. The characteristics of ceramic radiating and synthesized ejector radiating are combined to act as high-power integrated LED radiating. Two radiating modes are synchronously adopted in one system, so that an integrated LED can be quickly and effectively radiated; the service life of an LED chip can be prolonged; the production is simple; the shell has excellent insulativity; and the practicability is strong.

The invention discloses a rat-proof device for unequal-height gaps of furniture or equipment. The rat-proof device comprises a rat-proof plate group consisting of a plurality of upper rat-proof platesand a plurality of lower rat-proof plates, a gap full-supporting mechanism is further arranged, the gap full-supporting mechanism comprises at least one bottom plate assembly, a plurality of height-adjustable top plates independent of one another and spring assemblies arranged between the bottom plate assembly and the height-adjustable top plates, gaps are formed between the ends of the height-adjustable top plates, and any one height-adjustable top plate is connected to the bottom plate assembly through two sets of the spring assemblies; and the upper parts of the upper rat-proof plates arehinged to the corresponding height-adjustable top plates, and the lower parts of the lower rat-proof plates are separately hinged to the end of the bottom plate assembly. According to the scheme, springs are used for supporting the height-adjustable top plate assemblies and the bottom plate assembly, the deformation adjustable function of the bottom plate assembly is used, and the device adapts torat prevention at the bottom of furniture or equipment with equal-height or unequal-height gaps through the separation degree of the upper rat-proof plates and the lower rat-proof plates.

The invention discloses a semi-coke gas container generator set with a ventilation system, and particularly relates to the technical field of containers. The semi-coke gas container generator set comprises a container, the inner part of the container is divided into a control chamber and an engine chamber, an air inlet device is arranged above the control chamber, an air exhaust device is arrangedon one side of the inner part of the engine chamber; and the air inlet device comprises an air inlet silencing box, an air inlet fan, an air guide louver and an air inlet ventilation box, the air inlet ventilation box is fixedly arranged at the top of a rear end door of the container, the air inlet fan is installed in the inner part of the engine chamber, and the air guide louver is fixedly arranged at the air outlet end of the air inlet fan. According to the gas container generator set with the ventilation system, the air inlet device is arranged at the horizontal high position, the air guide louver is arranged, the air exhaust device is arranged at the vertical low position, the air flow angle is accurately controlled, heat dissipation of the generator set is achieved, meanwhile, toxicand harmful gas is prevented from being accumulated at the low position, the density of the toxic and harmful gas such as semi-coke gas is large, the gas can be smoothly exhausted, and the risk is effectively controlled.

The invention discloses a pest damage prevention device for equipment or furniture gaps. The pest damage prevention device comprises a stainless steel wire net and is further provided with a gap full-supporting mechanism; the stainless steel wire net is bent and wraps the gap full-supporting mechanism to form the pest damage prevention device for the gaps; the gap full-supporting mechanism comprises at least one bottom plate assembly, a plurality of mutually independent height-adjustable top plates and spring assemblies arranged between the bottom plate assemblies and the multiple height-adjustable top plates; the gaps are formed between the end parts of the height-adjustable top plates; and any height-adjustable top plate is connected with the corresponding bottom plate assembly through the two groups of spring assemblies. According to the scheme, the stainless steel wire net is bent and wraps the gap full-supporting mechanism to form the pest damage prevention device; the bottom plate assemblies and the height-adjustable top plates wrapped with the stainless steel wire net are jacked open through springs; and by utilizing the deformation adjustable function of the bottom plate assemblies, the pest and mouse prevention requirements of various arc gaps or bent gaps can be met.

The invention relates to the technical field of a computer and discloses a notebook computer radiator. The notebook computer radiator comprises a bracket, a bottom plate, fans, a refrigerating system, sound equipment and a wire collection device; the fans which are provided with upward openings and are communicated with the outside are arranged inside the bottom plate; the fans are controlled by a fan switch arranged on the wire collection device; refrigerating pipelines which are communicated with each other and are provided with exhaust outlets are laid inside the bottom plate; the wire collection device and a refrigerator are arranged on the lower end face of the bottom plate; the refrigerator is controlled by a refrigerator switch arranged on the wire collection device; the refrigerating system consists of the refrigerator, the refrigerator switch and the refrigerating pipelines; the sound equipment is arranged right ahead the bottom plate; and a wire and a power line are collected in the wire collection device. According to the invention, the fan and the refrigerating system are adopted to carry out heat dissipation refrigeration at different outside environment temperatures; the diversification of the refrigerating mode is implemented; the heat dissipating efficiency is improved; the service life of the computer is prolonged and the functions of the computer are increased; and by the common design of the radiator and the sound, the function diversification is implemented.

The invention provides a vapor chamber and terminal equipment. The vapor chamber comprises a first cover plate and a second cover plate; a recessed part is arranged on the first cover plate, and the recessed part is recessed towards the interior of the vapor chamber; and the second cover plate is connected with the first cover plate in a sealed manner so as to form a sealed containing cavity, and the recessed part is connected to the second cover plate in an abutting manner. The vapor chamber has the beneficial effects that the first cover plate is provided with the recessed part, so that when the vapor chamber is bent, the top end of the recessed part can be connected to the second cover plate in the abutting manner, and the circulation efficiency of the sealed containing cavity is improved. According to the terminal equipment, heat dissipation of a telescopic screen of the terminal equipment can be met, and bending of the vapor chamber is more convenient.

The invention relates to an LED lamp and a manufacturing method of the LED lamp. According to the LED lamp, the outer surface of a radiator is connected with a light source module, the light source module is connected to a lamp pole fixing assembly on the inner surface of the radiator through a connecting assembly, and the light source module, the radiator and a power source assembly are packaged through a sealing material. The manufacturing method comprises the steps that an aluminum substrate is processed through cutting and punching to form a U-shaped frame with a plurality of parallel L-shaped cooling fins, the cooling fins are stretched, and then a plurality of cooling grooves which are communicated with the outside world are formed in the U-shaped frame; LED light sources and back sealing supports are connected to the corresponding portions of the inner plane and the corresponding portions of the outer plane of the U-shaped frame of the radiator respectively; the positive electrodes and the negative electrodes of the LED light sources are connected with PCBs in a welding mode through connecting contact pins, so that the LED light sources are connected in series and in parallel; sealing spaces of the back sealing supports located among the light source module, the PCBs and the radiator are filled with sealants; the light source module and the radiator are connected to the lamp pole fixing assembly through the connecting assembly.

The invention provides an axial-flow fan. The axial-flow fan comprises a motor and an impeller part, wherein the impeller part comprises an outer impeller and an inner impeller; both the outer impeller and the inner impeller are arranged on the output shaft of the motor; the motor drives the outer impeller to rotate, so that the axial-flow fan performs heat dissipation on an outer part; the motordrives the inner impeller to rotate, so that internal heat dissipation for the axial-flow fan is realized; one end, with the inner impeller, of the motor is equipped with a gas-flow inlet; one end, away from the inner impeller, of the motor is equipped with a gas-flow outlet; and gas flow generated when the inner impeller rotates for dissipating heat of the inner part of the motor enters the motorthrough the gas-flow inlet, and is discharged through the gas-flow outlet. With the adoption of the technical scheme adopted by the invention, the axial-flow fan has the effects that: the axial-flowfan is simple and compact in structure, and is high in practicability while coping with a rigorous mounting environment; and the axial-flow fan adopts the inner impeller to do work for dissipating heat for the inner motor, so that the heat dissipation effect of the axial-flow fan is superior to that of a conventional motor heat dissipation way.

The invention relates to the technical field of power distribution cabinets. The invention relates to a power distribution cabinet with a noise reduction structure, which comprises an inner frame. Theouter side of the inner frame is sleeved with an outer frame. Sound absorption plates are arranged on the inner wall of the outer frame and the outer wall of the inner frame; a sealing plate is arranged at an opening between the inner frame and the outer frame; a vacuum cavity is formed among the inner frame, the outer frame and the sealing plate; a leather plug is inserted into the surface of the outer frame; a sleeve is arranged on the surface of the outer frame; the outer side of the sleeve is sleeved with a protection head; and a finger clamping plate is arranged on the surface of the protection head. The power distribution cabinet with the noise reduction structure has the beneficial effects that the power distribution cabinet with the noise reduction structure adopts a double-layerframe structure, the two layers of sound absorption plates are additionally arranged in the cavity between the two frames, the sound absorption plates are prevented from being exposed to the outer side and damaged, the space between the two frames is vacuumized, the sound insulation effect of the frames is improved, and noise generated by working of electric devices in the power distribution cabinet is reduced.

The invention relates to a protective board for a rear engine of a passenger car. The protective board comprises a protective board body arranged at the bottom of the engine and a connecting piece used for fixing the protective board body to a longitudinal beam of a car frame. A through hole matched with an oil discharge outlet of the engine in position is formed in the protective board body. The protective board body is obliquely arranged on the whole. The included angle between the protective board body and the horizontal plane is larger than the departure angle of the passenger car. By the adoption of the technical scheme, the protective board body is ingeniously mounted at the bottom of the engine according to the installation structure of the rear engine, and thus certain hidden dangers from the road surface can be avoided under the protection of the protective board body; meanwhile, the inclination angle of the protective board body is larger than the departure angle of the whole passenger car, in this way, the whole protective board body can retract into a car body, and the requirement for heat dissipation of the engine is met.

The invention discloses an 8-12GHz high-power solid-state power amplifier assembly. The top of an assembly cabinet body is provided with six paths of power divider assemblies. Six water cooling cabinsare fixed in the assembly cabinet body at intervals. One side of each water cooling cabin is provided with a water inlet joint and a water outlet joint, and one side of each water cooling cabin is provided with a solid-state power amplifier assembly. The 8-12GHz high-power solid-state power amplifier assembly provided by the invention has the advantages of independent assembly, disassembly and maintenance, weight reduction, strong backup capability, high reliability and the like while heat dissipation is satisfied.

The invention discloses a power battery assembly of a pure electric vehicle integrated with an air cooling apparatus. The power battery assembly comprises a battery pack body, a battery pack and an air outlet conversion apparatus; an upper shell is arranged on the upper part of the battery pack body; an upper shell convex cover is arranged on one side of the upper shell; a lower shell is arrangedat the lower ends of the upper shell and the upper shell convex cover; waist-shaped connecting pieces are arranged on the two sides of the lower shell; a waist-shaped hole B and a concave pit B are formed in each waist-shaped connecting piece; a circular hole connecting piece is arranged at one end of the lower shell; a circular hole and a concave pit C are formed in the circular hole connecting piece; lengthened waist-shaped connecting pieces are fixed on the two sides of the upper shell convex cover; a waist-shaped hole A and a concave pit A are formed in each lengthened waist-shaped connecting piece; and a battery base is arranged in the lower shell. The power battery disclosed in the invention is reasonable in layout, simple in structure, convenient to operate, and capable of satisfying effective battery heat dissipation by adopting the integrated air cooling apparatus; and meanwhile, by virtue of the structure matched with a floor, the space can be utilized fully in a condition ofa relatively small size, and convenience in mounting and detaching can be achieved.

The invention discloses a military heat dissipation device with an auxiliary heat dissipation function. The heat dissipation device includes a mounting seat used for mounting a fan, a main heat guiding pipe, a heat dissipation fin group, a first heat absorption piece and a second heat absorption piece. The heat dissipation fin group is disposed on one side surface of the mounting seat. The secondheat absorption piece is located on a side of the first heat absorption piece opposite the mounting seat. The heat dissipation fin group is formed by sequentially fastening a plurality of fins arranged in parallel. A side which is of the mounting seat and is connected with the main heat guiding pipe is opened with a groove. A heat dissipation end of the main heat guiding pipe is embedded in the groove, and is in welded connection with the mounting seat. The mounting seat is opened with a plurality of lock holes. Another end of an auxiliary heat guiding pipe is equipped with a heat absorption piece. The heat absorption piece is opened with a plurality of lock connection holes. According to the heat dissipation device, deviation and crushing of heat guiding pipe positions are prevented, stability of an entire heat dissipation structure can be improved, thus all components in the heat dissipation system are enabled to be mutually complemented, and heat dissipation performance and heat dissipation stability of the heat dissipation device are improved.

A rat-proof device for furniture or equipment with unequal height gaps, comprising a rat-proof board group composed of a plurality of upper rat-proof boards and a plurality of lower rat-proof boards, and a gap full support mechanism, the gap is fully supported The mechanism includes at least one bottom plate assembly, a plurality of mutually independent adjustable height top plates, and a spring assembly arranged between the bottom plate assembly and the plurality of adjustable height top plates, and there is a gap between the ends of the plurality of adjustable height top plates, and Any one adjustable height top plate is respectively connected with the bottom plate assembly through two sets of spring assemblies; the upper part of the upper rat-proof plate is hingedly connected with its corresponding adjustable height top plate, and the lower part of the lower rat-proof plate is hingedly connected with the end of the bottom plate assembly, respectively. This scheme uses springs to support the height-adjustable top plate and bottom plate assembly, utilizes the deformation adjustable function of the bottom plate assembly, and adapts to the bottom of furniture or equipment with equal or unequal height gaps through the separation of the upper and lower anti-rat plates. Rodent proof.

The present invention relates to the technical field of heat dissipation devices, and more specifically relates to an ultra-thin flat heat pipe and its manufacturing process, including a bottom plate and a cover plate snap-fitted and packaged, and the bottom plate is provided with concave holes with several capillary structures arranged in parallel. In the cavity, a gas flow channel for the flow of the working fluid of the heat pipe is formed between adjacent capillary structures, and the capillary structure includes several liquid flow channels arranged in parallel. The gas working medium flows in the gas flow channel, and the liquid working medium flows in the capillary structure, so as to realize the gas-liquid separation of the working medium, reduce the flow resistance, and improve the heat transfer limit of the heat pipe; and the invention has simple structure and simple manufacture, and can It realizes industrial assembly line production, and has strong heat transfer capacity. The thickness of the heat pipe is small, which can meet the heat dissipation of electronic devices in narrow spaces, and meet the needs of integration and miniaturization of electronic components. It has good practicability and applicability. .

A heat exchange structure, a heat exchange integrated device and an engine oil heat exchange system relate to the technical field of heat exchange. The heat exchange structure includes a heat exchange base and a heat exchanger; a closed heat exchange cavity is formed between the heat exchange base and the connecting shell; the heat exchanger is arranged in the heat exchange cavity, and the heat exchanger and the heat exchange base The heat exchanger is provided with a heat exchange inner flow channel and a raw liquid flow channel that are not connected to each other; the heat exchange base is provided with a raw liquid inlet and a raw liquid outlet that communicate with the raw liquid flow channel, and is also provided with a heat exchange inner flow channel. The heat exchange outlet is communicated; the heat exchange cavity outside the heat exchanger is the heat exchange outer flow channel; the heat exchange inner flow channel is communicated with the heat exchange outer flow channel. Both the heat exchange integrated device and the engine oil heat exchange system include a heat exchange structure. The purpose of the present invention is to provide a heat exchange structure, a heat exchange integrated device and an engine oil heat exchange system, so as to solve the problem in the prior art that the heat exchange performance in a small heat exchange space is difficult to satisfy the heat dissipation to a certain extent. requested technical issues.

The invention is applicable for the field of a speed-regulating resistor, and provides a chip module portion of the speed-regulating resistor of an automobile air conditioner and the speed-regulating resistor. The chip module portion comprises a bracket, two resistor chips and a radiating block; the section of the bracket along the direction which is parallel with the front and back sides is inversely U-shaped; the two resistor chips are located at the interior of the bracket and are parallel with the left and right sides of the bracket; the upper ends of the two resistor chips are connected transversely; and the radiating block is located between the two resistor chips and is in contact with the inner side faces of the two resistor chips. The resistor chips adopts a siamesed design mod, and matches with the U-shaped bracket and the radiating device to divide heat of a product into two portions; the windward side of each resistor chip comprises a front side, a backside and two contact surfaces in contact with the radiating device, so that the heat radiation efficiency of the product is extremely high; and the chip module portion satisfies the characteristics of small volume, high heat radiation efficiency and the like, can satisfy installation of different customers and heat radiation of products with different powers, and realizes modular design.

The invention discloses a method for tapping on an independent research board card block sheet for satisfying heat dissipation, and belongs to the computer communication field. An independent research board card block sheet comprises a block sheet body and a block sheet hook, wherein the block sheet body is provided with alveolate heat dissipation holes; the edge of the block sheet body is provided with a heat dissipation groove; the side length of each alveolate heat dissipation hole is 0.2-0.5cm; the cover area of the alveolate heat dissipation holes does not exceed 4 / 5 of the area of the block sheet body; and the area of a vertical split cross section of the heat dissipation groove is trapezoidal. The method for the independent research board card block sheet comprises the following specific steps: 1) according to the specification of a board card, selecting the specification of the independent research board card block sheet; 2) installing the independent research board card block sheet onto a corresponding hook hole of the board card; and 3) stretching the independent research board card block sheet, and confirming that the independent research board card block sheet is firmly installed. The invention has the benefits that heat dissipation effect is enhanced, and damages caused by refitting the board cards are avoided.

The invention discloses a portable heat dissipation device for mechanical automatic machining. The device comprises a fixed box, a fixed screw and a spray head. A fixed rope is fixed to the right sideof the fixed box, the bottom of the fixed box is provided with an opening plate, a plug pin is installed above the opening plate, a fixed block is fixed above the opening plate, a telescopic frame isarranged inside the fixed block, a motor is installed above the fixed block, a rotating shaft is fixed to the left side of the motor, a thread sleeve is connected to the left side of the rotating shaft, fan blades are arranged on the outer side of the thread sleeve, a filter plate is fixed to the left side of the fan blades, an observation window is connected to the left side of the fixed box, and rotary blades are arranged inside the observation window. The portable heat dissipation device for mechanical automatic machining is provided with the fixed rope and the observation window, workerscan hold the heat dissipation device with hand or carry the heat dissipation device on the back conveniently through the fixed rope, the observation window can be detached from the fixed box, and therefore carrying of the whole heat dissipation device is convenient.

The invention provides a fan speed regulating method and a fan speed regulating device for a rack-mounted server system. The method comprises the following steps: detecting a system temperature of therack-mounted server system, and simultaneously, detecting practical temperatures of various non-temperature sensitive components in the rack-mounted server system; according to the system temperature, determining a first duty ratio of a fan; according to the practical temperatures of the various non-temperature sensitive components, respectively determining the fan duty ratios corresponding to the various non-temperature sensitive components, and taking the maximum value of all fan duty ratios as a second duty ratio of the fan; and when the first duty ratio is greater than the second duty ratio, regulating the duty ratio fan of the fan according to the system temperature, and otherwise, regulating the duty ratio of the fan according to the practical temperatures of the non-temperature sensitive components corresponding to the second duty ratio. According to the fan speed regulating method and the fan speed regulating device for the rack-mounted server system, the control precision offan speed regulating can be improved, so that the fan speed regulating is more smooth and accurate.

The invention relates to the technical field of power distribution cabinets. The invention relates to a power distribution cabinet with a noise reduction structure, which comprises an inner frame. Theouter side of the inner frame is sleeved with an outer frame. Sound absorption plates are arranged on the inner wall of the outer frame and the outer wall of the inner frame; a sealing plate is arranged at an opening between the inner frame and the outer frame; a vacuum cavity is formed among the inner frame, the outer frame and the sealing plate; a leather plug is inserted into the surface of the outer frame; a sleeve is arranged on the surface of the outer frame; the outer side of the sleeve is sleeved with a protection head; and a finger clamping plate is arranged on the surface of the protection head. The power distribution cabinet with the noise reduction structure has the beneficial effects that the power distribution cabinet with the noise reduction structure adopts a double-layerframe structure, the two layers of sound absorption plates are additionally arranged in the cavity between the two frames, the sound absorption plates are prevented from being exposed to the outer side and damaged, the space between the two frames is vacuumized, the sound insulation effect of the frames is improved, and noise generated by working of electric devices in the power distribution cabinet is reduced.

The invention relates to a mute diesel engine generator, in particular to a high power density mute diesel engine generator. The high power density mute diesel engine generator can be applied to the narrow space and high-temperature and low-temperature severe environments. The high power density mute diesel engine generator comprises a mute box body and a power generator assembly, wherein the power generator assembly can be held in the mute box body. The high power density mute diesel engine generator further comprises a heat dissipation air channel. Due to a noise reduction structure with a muffler and the mute box body, the mute effect is further enhanced. Due to the fact that the independent heat dissipation air channel is designed under the condition that the size of the diesel engine generator is unchanged, the requirement for heat dissipation of the diesel engine generator is met, and the size and the weight of the diesel engine generator are not increased.