534results about How to "Improve heat exchange efficiency" patented technology

The invention discloses a precession-type backfill grouting ground source thermal energy conversion precast pile device, which comprises a plurality of precession-type backfill grouting prefabricated screw piles respectively embedded into pile holes, wherein a vertical heat exchanger is embedded in each screw pile; the inlet end and the outlet end of each vertical heat exchanger respectively extend out of an opening at the upper end of the screw pile to be respectively connected with a horizontal liquid-feeding collecting pipe and a horizontal liquid outlet collecting pipe in a bearing platform or a cushion layer; centring brackets are arranged at an interval of 1-3 m along the length direction of each vertical heat exchanger; each precession-type backfill grouting prefabricated screw pile comprises a hollow pile core, wherein the bottom of the pile core is provided with a cone-shaped pile head; a screw blade is arranged on the position far away1-3m from the lower part of the outer wall of the pile core; and a post grouting reinforcing layer is poured between the middle upper part of the outer wall of the pile core and a pile hole wall. The precession-type backfill grouting ground source thermal energy conversion precast pile device comprises a plurality of precession-type backfill grouting prefabricated screw piles, and the vertical heat exchanger is embedded in each screw pile; the pile foundation construction and the ground source heat pump construction are integrated so as to avoid a drilling and pipe-laying program of a ground source heat pump system on the ground, greatly lower the front-end investment cost and save the land use area; and the post grouting reinforcing layer is poured between the middle upper part of the outer wall of the pile core and the pile hole wall so as to enlarge a heat conduction area, improve the heat conduction performance and simultaneously improve the pile body bearing capacity.

The invention discloses a clothes drying temperature detection control method and a clothes drier. In the process of drying, a control system is used for detecting a change delta T of temperature of outgoing air in front and in rear of a condenser after drying, and determines whether the change of temperature difference of outgoing air before or after passing the condenser reaches a corresponding set value delta Tt_g or not; g is the weight of clothes to be dried; if the delta T is larger than or equal to the delta Tt_g or lasts for a set time T within a certain set value range, the clothes are dried and a heating device stops operating; after the heating device stops operating, a drying program proceeds and does not ends until the detected temperature of incoming air is lower than the set temperature; and in the process of drying, heat of humid hot air after being subjected to heat exchange with clothes and before being subjected to cooling and dehumidification is subjected to heat exchange with air which is subjected to condensation and dehumidification, and the preheated air subjected to condensation and dehumidification is heated again and led into the clothes to dry the clothes. Using the waste heat saves electric energy and time, temperature detection and determination are accurate, and drying efficiency is improved.

The invention relates to a liquid nitrogen strong cooling transformer and a refrigerating method thereof. The transformer comprises a transformer oil tank and a liquid nitrogen tank; the liquid nitrogen tank is connected with a liquid nitrogen outlet pipe; the transformer oil tank is connected with a gas nitrogen outlet pipe; an evaporating pipe is coiled in the transformer oil tank; one end of the evaporating pipe is communicated with the liquid nitrogen outlet pipe and the other end of the evaporating pipe is communicated with the gas nitrogen outlet pipe; the gas nitrogen outlet pipe is sequentially provided with a liquid nitrogen compressor, a condenser and a throttling valve; the tail end of the gas nitrogen outlet pipe extends into the liquid nitrogen tank; a temperature sensor is arranged in the transformer oil tank; and the liquid nitrogen outlet pipe is provided with a heat preservation electromagnetic valve electrically connected with the temperature sensor. The liquid nitrogen strong cooling transformer and the refrigerating method thereof have the beneficial effects that 1, heat exchange is carried out between liquid nitrogen and transformer oil, heat exchange efficiency is high and gas nitrogen is retransformed into liquid nitrogen by the liquid nitrogen compressor and the condenser and is recycled; and 2, the transformer oil in upper and lower cavities of the transformer oil tank is repeatedly circulated by a transformer oil circulating pipe and a circulating oil pump so as to enable the oil temperature to be balanced.

The invention discloses a motor cooling and vibration reducing mechanism, and belongs to the technical field of motors. The motor cooling and vibration reducing mechanism comprises a motor main body,a heat dissipation shell and a base, wherein the motor main body is fixedly connected to the interior of the heat dissipation shell through a heat dissipation water jacket, a refrigerant sucking and discharging assembly is fixedly connected to the side wall of a supporting plate, one end, away from a second driving shaft, of a reciprocating mechanism is connected to the refrigerant sucking and discharging assembly, one end, away from the motor main body, of the second driving shaft is connected to a heat dissipation assembly, a push rod is movably connected to the side wall, close to the base,of the heat dissipation shell, and an air diffusion assembly is connected to one end, away from the push rod, of a sliding block. According to the invention, the cooling liquid in the heat dissipation water jacket is sucked out and then pressed back through the refrigerant sucking and discharging assembly to increase the liquid flowing speed so as to improve the heat dissipation efficiency; and under the actions of the buffer assembly and the second spring of the push rod, the motor can be subjected to vibration reducing while the hot gas in the heat dissipation shell can be discharged to dissipate the heat of the motor so as to improve the heat dissipation efficiency and the vibration reducing efficiency.

Provided are a cooling device coated with carbon nanotubes and method of manufacturing the same. Carbon nanotubes are dispersively coated on a surface of the cooling device that radiates generated by a predetermined apparatus or component through thermal exchange. Thus, a carbon nanotube structure is formed so that the cooling device can improve in a thermal radiation characteristic and become small-sized. As a result, electronic devices can be downscaled and heat generated by a highly integrated electronic circuit chip can be effectively radiated, thus increasing lifetime and performance of an operating circuit.

A heat exchanger assembled from multiple heat exchanging tubes. Each of the multiple heat exchanging tubes is formed as a flattened tube of 0.5 mm in thickness by press work or bending work of a stainless steel plate member having a thickness of 0.1 mm. Each of the multiple heat exchanging tubes is structured to have multiple lines of sequential wave crests and multiple lines of sequential wave troughs formed on each of flattened faces of the heat exchanging tube. The multiple lines of the sequential wave crests and the multiple lines of the sequential wave troughs are arranged to have a preset angle γ relative to a main stream of an air flow. The lines of the sequential wave crests and the lines of the sequential wave troughs are symmetrically folded back about folding lines arranged at a preset interval W along the main stream of the air flow.

The invention relates to an active magnetic refrigerator includes separated hot and cold heat exchange units wherein a heat transfer fluid that exchanges a heat with a magnetic heat exchange unit having the magnetocaloric material pieces arranged to have a gap therebetween separately circulates through a solenoid valve.

The invention relates to a processing method for coal flue gas. Smoke dust particles and sulfur are removed from the coal flue gas through dry filtration, and sulfur dioxide is removed through a wet process, wherein, the dry filtration process comprises the steps that the coal flue gas passes through ceramic filtering materials; the process for removing the sulfur dioxide with a wet method has the steps that the sulfur dioxide is removed through the reaction of the coal flue gas after being processed with a dry method and calcium carbonate serosity. The invention has evident desulfation effect, and a formed accessory substance has very high added value; the invention can rationally use the residual heat of the high temperature coal flue gas; the invention realizes the removing of an element S and the recovery of the high purity, simultaneously performs the decarbonization process, and avoids the environmental pollution; the equipment adopted by the invention is easy to be assembled and disassembled, cleaned, and maintained; the invention resolves the contradiction between the operating costs and the operating effects of the desulfation and the decarbonization, and has huge economic interest and huge application foreground.

To improve a heat exchange efficiency of a heat sink without enlarging the heat sink. The heat sink of the invention comprises a heat receiving base receiving heat from an exothermic element, a plurality of fins radiating heat arranged radially around the heat receiving base at predetermined intervals, and one or more heat pipe(s) comprising a curved portion. One of end portions of the curved portion is individually connected to a predetermined portion of the heat receiving base, and a predetermined region of the curved portion is contacted with the fins in a heat transferable manner.

The invention discloses an iron-based nanocrystalline composite coating for protecting a boiler tail heating surface and a laser-cladding forming process of the iron-based nanocrystalline composite coating. The iron-based nanocrystalline composite coating comprises the following components in percentage by weight: 49.9-62.8% of Fe, 14.2-20.4% of Cr, 9.0-16.3% of Mo, 2.9-4.1% of B, 0.6-1.3% of C, 1.0-2.4% of Mn, 3.4-8.0% of W, 1.0-1.9% of Si and 0-3.9% of RE, wherein RE is a rare earth element. The forming process comprises the following steps: preparing alloy powder of the iron-based nanocrystalline composite coating; treating the surface of the boiler tail heating surface; preparing the iron-based nanocrystalline composite coating through a simultaneous powder feeding method and a laser-cladding method, wherein the laser cladding is performed for multiple times. The formed iron-based nanocrystalline composite coating is 1 mm above in thickness. The iron-based nanocrystalline composite coating can obviously enhance the wear resistance and corrosion resistance of the boiler tail heating surface, and reduce maintenance costs of worn and corroded parts and consumption of raw materials of a power plant.

The present invention relates to a garment processing apparatus comprising: a hot-air supply unit having a circulation flow path for directing the air drawn out from the interior of a garment receiving unit into the interior of the garment receiving unit, a heat exchange unit provided to the circulation flow path, for condensing and heating the air introduced into the circulation flow path, and a blower for circulating the air in the interior of the garment receiving unit through the circulation flow path; and a dryness detection unit having a flow rate detection means for measuring the amount of condensate water formed in the heat exchange unit, and a control section for determining the amount of moisture contained in the laundry on the basis of the flow rate data provided by the flow rate detection means.

The invention relates to a household heating-type exchange water heater utilizing water heating or steam heating as a heat source, and discloses a turbulence self-cleaning reduced pressure pipeline exchange water heater which consists of a plurality of tap-water tensile heat tubes, a heat tube communicating part, heating tubes, an inner tube communicating part, a connecting part, a plurality of inner round arc end socket, a small round arc end socket and a relief valve, wherein the two ends of the plurality of tap-water tensile heat tubes, the heat tube communicating part, the inner tube communicating part and the connecting part are welded, serially connected and communicated into a rectangle, and a plurality of heating tubes placed in the middle are fixedly arranged in the tap-water tensile heat tubes and the plurality of heating tubes and the inner tube connecting part are welded, serially connected and communicated into a rectangle; the plurality of tap-water tensile heat tubes are formed by stretching from the external diameter to the inner diameter of the circumferences of tube bodies to form a plurality of elongated bosses and evenly distributing a plurality of sections on the inner-diameter circumferences of the tube bodies; and the plurality of the inner round arc end sockets and the two ends of each tap-water tensile heat tube are in close fit, are level with one another and are fixedly connected by virtue of welding or are fixedly connected by virtue of butt welding, thus the heat exchange effect of a heat exchange body is effectively increased.

The invention discloses a hydraulic retarder. The hydraulic retarder comprises a hydraulic retarder shell, an oil storage tank, a stator, a rotor and a heat exchanger, wherein the oil storage tank, the stator and the rotor are all arranged in the hydraulic retarder shell, and the heat exchanger is fixedly arranged outside the hydraulic retarder shell; oil inlet holes a and oil outlet holes are arranged on the stator and along the periphery of the stator; and a second oil inlet channel is internally provided with a check valve, the check valve comprises a piston, a spring, a piston guide hole and an oil discharge groove, one end of the piston is pressed at the end part of the heat exchanger shell to block an oil inlet, the other end of the piston extends into the piston guide hole to be matched with the piston guide hole in a sliding mode, the spring is sheathed on the piston, one end of the spring is pressed on the piston, the other end of the spring is pressed on the hydraulic retarder shell, and the piston guide hole is communicated with an oil outlet by the oil discharge groove. When oil in the piston guide hole is compressed by the piston, the oil is discharged by the oil discharge groove, so that the counter-acting force is not generated to the piston to block the movement of the piston, the oil feeding speed of the retarder is enhanced, and the response time of the retarder is improved.

The invention discloses a heat exchanger with a corrugated pipe coil structure provided with an internal duct and an external duct, which comprises an inlet, an outlet, a corrugated pipe, a dome, an internal ring bushing, an external ring bushing, a fan and a bracket. When fluid media to be in heat exchange flow in the corrugated pipe in the heat exchanger from the inlet, form a turbulent flow in a pipe wall with a corrugated structure and carry out heat exchange with air in the internal duct and the external duct outside the corrugated pipe via the wall of the corrugated pipe, the fan discharges air in the internal duct and the external duct, and the fluid media are discharged from the outlet after the heat exchange performed in the corrugated pipe in a spiral way. The heat exchanger has the advantages of high heat exchanger effectiveness, simple structural technology, light weight, integration, and the like, and the fluid media in the pipe coil after the heat exchange have even temperature, thereby the heat exchanger can be used for heat exchange of air, liquid and air-liquid mixing substances. When the corrugated pipe adopts resistant materials, the heat exchanger can be used for heat exchange for corrosive liquid media.

The invention relates to a liquid-state heat exchanger, and particularly relates to a household heat-exchange water heater which takes heat supply type water heat or gas heat as a heat source, and belongs to a water heating device. The heat-exchange water heater comprises a plurality of tap water heat conduction pipes 1 which are connected and communicated with one another in series, tap water heat conduction pipe communicating pieces 2, steam heating pipes 3, internal pipe communicating pieces 4, internal circular chamfering end covers 6, air-release valves 8, inner-screw steam inlet connectors 9 and inner-screw tap water inlet connectors 11. The heat-exchange water heater is characterized in that the two ends of the plurality of tap water heat conduction pipes 1 are serially connected and communicated with the tap water heat conduction pipe communicating pieces 2, the internal pipe communicating pieces 4 and connecting pieces 5 in a welding manner so as to form a rectangle; the plurality of internal circular chamfering end covers 6 are welded at the two ends of the tap water heat conduction pipes 1; each two adjacent steam heating pipes 3 are fixedly connected with the internal pipe communicating pieces 4 in a mode that the inner walls of the pipes are welded; before the steam heating pipes 3 are fixedly connected with the internal pipe communicating pieces 4 in a welding manner, round holes are punched firstly, and subsequently, turnup round-hole bosses 17 are stretched to be fixedly connected with the internal pipe communicating pieces 4 in a welding manner.

An ultrasonic automatic defrost equipment for refrigerator in the refrigeration technology field, including the ultrasonic producer, the ultrasonic energy transducer and the frost-layer inductor. The ultrasonic energy transducer sticks near one side of the cold-producing medium pipeline, the ultrasonic producer fixes beside the ultrasonic energy transducer and cannot touch with the evaporator, the frost-layer inductor sets near the evaporator in the freezing chamber of the refrigerator and consist of two probes, one is connected with the evaporator, there is a gap between the other probe and the evaporator. The invention is: at the condition of maintaining the temperature of the freezing chamber, removes the frost layer of the evaporator surface; it not only improves the heat exchange efficiency of the evaporator and ensures the refrigeration capacity at the higher level because it defrosts when the frost-layer is thin, but also ensures the freezing quality of the food by maintaining the temperature of the freezing chamber during the defrost process.

The invention relates to a method for forced uniform solidified continuous preparing metal slurry, comprising that (1) melting overheat metal with the temperature more than the liquidus temperature about 0-100deg.C is poured into upper guide flow pipe; (2) the liquid metal flows into the melting deconcentrator and the liquid metal is injected on the inner round wall of melting deconcentrator; the temperature control system out of pulping room make the wall temperature of pulping room be controlled lower than the liquidus temperature about 0-100deg.C; the liquid metal is collected at the cone bottom to obtain the metal slurry with solid fraction smaller than 30%; the metal slurry flows out through the lower guide flow pipe and the temperature is controlled in -10-10deg.C of liquidus temperature; (3) the metal slurry flows into the collector or is sent into the common equipment such as die-casting, rolling and forging so on directly to carry rheological forming out and or is cast into the mould continuously to produce semi-solid continuous casting slab. The merit of invention is that the preparation of metal slurry is uniform, mass and continuous, and it can satisfy the demand of huge industrial production easily.

The invention discloses a wavelike finned type cold accumulation heat exchanger, which is mainly used for a cold accumulation container. The heat exchanger comprises an outer tube, wherein a front seal sheet of the outer tube and a rear seal sheet of the outer tube which are arranged on the end surface of the outer tube; the rear seal sheet of the outer tube bulges outwards to form a fill orifice; the fill orifice is provided with a rear seal cap; two inner tubes communicated through an elbow bend pipe are fixed in the inner cavity of the outer tube; the end surface of the inner tube is provided with a front seal sheet of the inner tube and a rear seal sheet of the inner tube; the front seal sheet of the inner tube and the front seal sheet of the outer tube are fixed together by welding the joints; the tail end of the joint is provided with a front seal cap; the upper side and lower side of the outer tube body are formed by wavelike tube walls; the wavelike tube wall forms a bulgy inner fin and a bulgy outer fin on the inner surface and the outer surface respectively; the inner tube body forms a bulgy outer fin on the outer surface. The wavelike finned type cold accumulation heat exchanger has simple structure, low manufacturing cost and high efficient heat exchange, contributes to high efficient heat exchange between a cold accumulation material in the outer tube and the outside, can avoid damage on the heat exchanger caused by the effect of expansion on heating and contraction on cooling, has cold accumulation material and has double functions of, cold charge and discharge.

A heat exchanger has No.1 and No.2 manifolds with joint holes, many parallel flat tubes connecting inserting into joint holes of No.1 and No.2 manifolds, outer fins between adjacent flat tubes, with each flat tube unit composed of at least one flat through channels. There is a parallel section between the flat tubes through channels. The said flat tube channel is made of aluminum extrusion of thin wall section bars, with over one coolant and heating flow channels. It applies to horizontal flow cooler of vehicle transmission and horizontal flow water tank of automobile engine coolant, and horizontal warm air core for warm air for auto air conditioner.

The invention provides heat exchanger, method of manufacturing heat exchanger, liquid cooling system, light source device, projector, and electronic equipment.A method of manufacturing a heat exchanger having a plurality of fine flow channels includes forming a plurality of thin plate members into a predetermined shape, and laminating the plurality of thin plate members and bonding by diffusion bonding.

The invention discloses a heat exchanger which comprises a pipe shell. An outlet pipe is arranged on the upper side of the pipe shell. An inlet pipe is arranged on the lower side of the pipe shell. Both ends of the pipe shell are provided with pipe sheets. An end plate is arranged on one side of each pipe sheet. The pipe sheets are provided with clear openings corresponding to each other. Heat exchange tubes are arranged in the clear openings and communicated with the end plates. The heat exchange tubes are made of carborundum or silicon nitride. Glands are arranged inside the clear openings. The glands are connected with the outside diameter of one end of the heat exchange tubes; lug bosses are arranged on the inner side of the clear openings; multi-stage sealing devices are arranged between the glands and the lug bosses. The heat exchanger has the advantages that the heat diffusivity of the heat exchange tubes is very high, thus significantly improving the production efficiency; the dust does not deposit on the heat exchange tubes which are not blocked therefore; under the condition of the same production efficiency, the size of the heat exchanger is significantly reduced due to the improvement of the heat exchange efficiency, thus reducing the manufacturing cost and the running cost; the multi-stage sealing element is adopted, thus significantly improving the seal effect.

A fuel cell module which provides a structure of not causing gas leakage on an oxygen-containing gas flow path including a heat exchanger, and is reduced in costs. The fuel cell module comprises a power generating chamber housing a fuel cell, and an almost rectangular parallelepiped casing enclosing the power generating chamber, wherein the left and right walls and the top wall of the casing are hollow walls each forming a reaction gas flowing space by an outer shell member and an inner shell member provided in parallel with a specified gap between them, the outer shell member and the inner shell member are respectively formed in a U-shape in section, and a reaction gas introducing member is provided that suspends into the power generating chamber from the inner shell member of the top wall, communicates with the reaction gas flowing space, and introduces a reaction gas into the power generating chamber.

A dryer with a heat pump that includes a cabinet , a drum installed within the cabinet, and an exhaust duct configured to exhaust air from the drum to outside of the cabinet . The dryer also includes a fan configured to inhale air from the drum and pump the air to the exhaust duct, an evaporator configured to exchange heat with air being exhausted through the exhaust duct, and a condenser disposed at a rear side of the drum. The dryer further includes an intake passage member configured to guide air that has passed through the condenser into the drum and a compressor and an expansion apparatus configured to define a heat pump along the evaporator and condenser.

In a primary heat exchanger, a heat conduction pipe is arranged as one connected pipe in a lower stage and an upper stage in a manner extending back and forth through a plurality of fins. The heat conduction pipe is arranged such that a pitch between the heat conduction pipes in the upper stage is shorter than a pitch between the heat conduction pipes in the lower stage. In addition, the heat conduction pipe is arranged such that a position in a center of each heat conduction pipe in the upper stage in a second direction orthogonal to a first direction in which the heat conduction pipe extends and a position in a center of each heat conduction pipe in the lower stage in the second direction are displaced from each other.

The invention provides a desktop air conditioner. The desktop air conditioner comprises a first centrifugal fan, a second centrifugal fan, a refrigerating and heating device and a shell. The refrigerating and heating device is provided with a semiconductor chilling plate, is fixedly arranged above the first centrifugal fan and the second centrifugal fan and is configured to allow heat exchange to be carried out between first airflow and a first varying temperature surface of the semiconductor chilling plate and between second airflow and a second first varying temperature surface of the semiconductor chilling plate, and therefore the temperature is changed. The first centrifugal fan, the second centrifugal fan and the refrigerating and heating device are surrounded by a cavity in the shell; a first air inlet communicated with a first air inlet area is formed in the lower portion of the front side face of the shell; a first air outlet from where the first airflow is blown out is formed in the upper portion of the front side face of the shell; a second air inlet communicated with a second air input area is formed in the lower portion of the rear side face of the shell; a second air outlet from where the second airflow is blown out is formed in the upper portion of the rear side face of the shell. According to the desktop air conditioner, due to the adoption of the two centrifugal fans and the refrigerating and heating device, cold air or hot air can be blown out; in addition, the desktop air conditioner is large in air output, small in size and low in noise.

In an outdoor unit of an air conditioner, the inner part of machine casing is divided into a heat exchange chamber and a machine chamber by a partition plate. The heat exchange chamber accommodates a heat exchanger and an air blower. The machine chamber accommodates a compressor, an electrical installation box and a liquid accumulator. A reinforcing plate is adhibited on the partition plate. The liquid accumulator is installed on the partition plate through the reinforcing plate. The back surface of partition plate and reinforcing plate are fixed on the tube plate of heat exchanger together. The electrical installation box is provided with a first supporting plate which extends on the partition plate with a width approximately same to that of partition plate and supports the substrate of heat exchanger at the side of machine chamber. The back surface of the first supporting place can be temporarily fixed on the rib of tube place of heat exchanger at a state that the upper surface of partition plate loads the first supporting plate. Furthermore, the heat exchanger which is formed by curving a plurality of laminated finned tube type heat exchange parts and is formed with a step part at one end is provided in the machine casing. A guiding plate which guides the external air into the step part is also provided in the machine casing. The fixing part of guiding plate is installed on the heat exchange part configured at the inner side, and furthermore the side surface of guiding plate is installed on the baseboard of machine casing. A clearance for the outer gas flowing is provided between the side surface and the end of heat exchange parts which are configured at the outside.

The invention relates to a vehicle-mounted refrigeration equipment driven by engine waste heat. The vehicle-mounted refrigeration equipment comprises a generator, a condenser, an evaporator, an absorber, a generator heating circulation loop arranged between the generator and the engine, a solution loop and a refrigerant water loop, wherein the solution loop comprises a concentrated solution channel and a dilute solution channel which are respectively provided with a pump and an electromagnetic valve. Since the concentrated solution channel and the dilute solution channel are directly arranged between the generator and the absorber in the solution loop and the pump and the electromagnetic valve are respectively arranged on the concentrated solution channel and the dilute solution channel, linked control between a high-pressure region and a low-pressure region can be realized by the electromagnetic valve and the pump, thus control based on difference of liquid level of a U-shaped tube in the prior art can be avoided; relative to the control mode of the U-shaped tube, the vehicle-mounted refrigeration equipment has the advantage of smaller size, therefore the equipment is more suitable for being installed on the bodies of large and medium-sized vehicles.

The invention discloses an indirect hot-air furnace using alcohol base liquid fuels, which comprises a furnace body, wherein a combustion chamber and a heat exchange chamber are arranged in the furnace body, an air inlet, an air outlet and a smoke outlet are formed in the furnace body, and a distributed alcohol base liquid fuel burner and a fuel supply device for providing alcohol base liquid fuels and combustion-supporting gas for the distributed alcohol base liquid fuel burner are arranged in the combustion chamber; and at least two groups of heat exchangers are arranged in the heat exchange chamber in parallel in the conduction direction of hot air generated by the combustion chamber, wherein a hot air inlet and a hot air outlet are formed in each group of heat exchanger, a hot air diversion channel for allowing the heat-exchange air to circulate is arranged between the hot air outlets and the hot air inlets of each two adjacent groups of heat exchangers, the air inlet is communicated with the hot air inlet of the group of heat exchanger which is farthest from the combustion chamber, a blowing unit is arranged at the air inlet, and the air outlet is communicated with the hot air outlet of the group of heat exchanger which is closest to the combustion chamber.

The invention discloses a forced air cooling engine. The forced air cooling engine comprises a crankshaft box body and an engine box body which is integrally shaped with a reciprocating piston cylinder body, wherein a plurality of cooling air ducts passing through the cylinder body entity part are formed on the cylinder body; three upper cooling air ducts are formed on the upper half entity of the cylinder body; a main air duct passes through the upper side of a combustion chamber; left and right air ducts respectively pass through an air intake and an air vent of the cylinder body; the inlets of the three air ducts are positioned on the cylinder body wall provided with a wind scooper; the outlets of the three air ducts are positioned on other side walls of the cylinder body; at least onelower cooling air duct is formed on the lower part of the cylinder body; and the lower cooling air duct passes through an entity between a cylinder and a tappet chamber from the left and right sides of the cylinder body and forms an annular air duct surrounding the cylinder together with the space between radiating fins. Cooled air can flow through a high-heat area to carry heat away by arrangingthe cooling air ducts in the high-heat gathering area of an engine body, so that the combustion chamber and the cylinder are effectively cooled, the radiation of the engine body can be quickened and the performance of the engine can be improved.

An inductive heating element includes a substrate and an insulating layer covering the substrate. The substrate contains a carbonaceous material such as glassy carbon. The inductive heating element effectively exchanges heat with a flowing gas to be heated and thereby efficiently heat the gas.