84results about How to "Improve heat production efficiency" patented technology

The invention provides a device and a method for repairing a friction stir welding weld defect of a storage tank for a carrier rocket. A repair welding pin tool comprises a tool pin clamping structure and a tool pin, the end face of a shaft shoulder portion of the tool pin clamping structure is a recessed slope provided with two concentric-circle annular grooves, the front of the tool pin is of a conical thread structure, and a conical thread is circumferentially provided with three spiral grooves at intervals. The method includes the steps: firstly, manually excavating the tool pin broke at a friction stir welding weld; secondly, performing solid filling for the weld; thirdly, utilizing the repair welding pin tool to start friction stir welding from a center of the broke position of the tool pin filled with welding wires or materials to a set welding end point; and finally, continuing utilizing the repair welding pin tool to perform friction stir welding for the weld again from a welding start point to the welding end point. The method and the device are capable of guaranteeing the quality of the storage tank for the carrier rocket and decreasing scrapping of the storage tank for the carrier rocket due to the key hole type defect.

The invention provides a method and a device for starting a fuel cell subzero starting, and belongs to the technical field of fuel cells. The method comprises the following steps: intermittently or continuously providing a hydrogen-containing atmosphere for the fuel cell when the fuel cell is started below zero, and then applying current or voltage control to the fuel cell to heat the cell so as to quickly increase the temperature of the cell. The device comprises a fuel cell, a hydrogen supply device and a current generating device, an air outlet of the hydrogen supply device is simultaneously communicated with a hydrogen electrode and an air electrode of the fuel cell, or the air outlet of the hydrogen supply device is communicated with any one of the hydrogen electrode and the air electrode of the fuel cell, and the hydrogen electrode and the air electrode of the fuel cell are communicated through a pipeline. The invention aims to solve the problems that the fuel cell is large in energy consumption for subzero starting, water icing is generated, the performance of the cell is reduced, and the service life of the cell is prolonged, and is particularly suitable for subzero starting of fuel cell commercial vehicles.

The invention provides a high-condensation heat accumulating type solar water heater which comprises a condenser, a heat collection component, a connecting line, a heat accumulator and a base; the base supports the condenser; the condenser comprises a reflective plate and two side plates; the reflective plate and the two side plate defines a condensation cavity provided with an opening; the condensation cavity faces the sun at a preset angle; the heat collection component is fixedly arranged in the condensation cavity, and comprises a plurality of transversely arranged heat collection pipes; a first reflective surface and a second reflective surface which can reflect sun rays are formed on the inner surface of the reflective plate; a curvature radius of the second reflective surface is greater than that of the first reflective surface; the sunny sides of the heat collection pipes receive direct light rays from the sun; the night sides of the heat collection pipes receive reflected light rays from the first reflective surface and the second reflective surface; the heat accumulator is arranged in the heat collection pipes or the heat accumulator and the heat collection pipes form a circulation loop; and heat energy generated by the heat collection pipes is stored in the heat accumulator.

The invention discloses a lithium ion secondary battery having a self-heating function. The lithium ion secondary battery comprises a battery cell, an outer package and electrolyte; the outer package is used for encapsulating the battery cell; the electrolyte is filled in the outer package; a cathode and an anode are leaded out on the battery cell; a metal foil positioned at one side of the battery cell is also arranged in the outer package; the metal foil is provided with a third pole; and the third pole and the anode can be connected or disconnected. After the above structure is adopted, short-circuiting between the cathode and the anode can be caused by connection between the third pole of the metal foil and the anode in a low-temperature condition; heating can be caused when relatively large current passes through the metal foil instantly, so that the internal temperature of the battery is improved better; relatively high capacity of the lithium ion battery in a low-temperature environment can be ensured; furthermore, due to the internally insulated metal foil, the heat production efficiency is far greater than that in an external heating manner; furthermore, the internal temperature rising uniformity of the battery is better; the cost of the battery is also reduced; the energy density of the battery is increased; and in addition, the lithium ion secondary battery also can be suitable for different environmental temperatures better.

The invention discloses a small-diameter shaft shoulder stirring head. The small-diameter shaft shoulder stirring head comprises a clamping part, a shaft shoulder part and a stirring needle which aresequentially connected, the diameter of the needle tip part of the stirring needle is defined as L1, the diameter of the needle root part of the stirring needle is defined as L2, the diameter of the shaft shoulder part is defined as L3, the ratio of L1 to L2 is equal to 1 to 1-1.7, the ratio of L2 to L3 is equal to 1 to 1.8-2.5, the end face of the shaft shoulder part comprises a stirring area close to the stirring needle in the radial direction and an envelope area away from the stirring needle, and the stirring area is provided with a non-concentric circle structure for improving the friction torque. The stirring head has the advantages that stirring and heat production effects can be increased, welding defects can be avoided, and the stirring head is suitable for producing narrow-edge welds.

The invention provides a graphene coating electrothermal needle for high-efficiency heat production. The graphene coating electrothermal needle comprises a tubular hollow needle body, a bevel connection needle tip integrated with the tubular hollow needle body, an insulated heat insulating coating and graphene coating of nano-silica gel which are attached to the outer surface of the hollow needlebody, an insulated conductor penetrating through the hollow needle body and the graphene coating to form a closed loop, a connection point between the insulated conductor and the graphene coating andan insulated needle handle used for pinch; the needle body is coated with the insulating coating and the graphene coating in sequence, and the heat production part is the graphene coating, the heat production efficiency is higher, and the graphene coating electrothermal needle is superior to existing most electrothermal materials; the positive and negative electrodes of a power supply are connected to the upper and lower ends of the graphene coating through the insulated conductor respectively, the current does not flow through the needle body, the heat production position is precise, and thetemperature is easy to control. The graphene coating electrothermal needle for the high-efficiency heat production has the advantages that the structure is simple, the use is convenient, the graphenecoating electrothermal needle is safe and reliable, the needle handle insulates heat, and the fine operation of a needle operator cannot be disturbed.

The invention discloses a pneumatic typethermal blockage dredging filter screen based on waste gas and dust purification, and belongs to the technical field of waste gas purification. According to thescheme, when a first filter screen is blocked, the air pressure on the left side of the first filter screen can be gradually increased, so that part of waste gas is promoted to fully react with reductive iron powder, and therefore, the temperature of a memory alloy spring increases, metal blockage dredging fiber ropes are pushed to move rightward to break granular materials accumulated on the left side of the first filter screen; when the waste gas enters an air impact balloon, a pneumatic rotating plate can be promoted to rotate, so that a built-in air bag ball is driven to rotate; along with the rotation of the built-in air bag ball, ferric ferrous oxide obtained after reacting reductive iron powder and oxygen is adsorbed, the reaction between oxygen in the waste gas and the reductive iron powder can be promoted by means of swing of thepneumatic rotating plate, so that the heat production efficiency is improved; and after the temperature is reduced, the memory alloy spring is promoted to recover to the low-temperature phase state thereof, so that the metal blockage dredging fiber ropes are dragged to reset.

The invention discloses a flame gun control type discarded radio frequency cable recovery apparatus comprises a rack. An unrolling wheel is mounted on the side wall of the rack; a rolling wheel is arranged on the rack; a driving motor is arranged on the rack; the front part of the driving motor is provided with a driving shaft; a driving wheel covers the periphery of the driving shaft; the driving wheel is engaged with the rolling wheel; a suspended ceiling rack is arranged in the internal top of the rack; a suspended ceiling is arranged on the suspended ceiling rack; a temperature controller is mounted on the rack; the lower part of the suspended ceiling rack is provided with electric heating pipes; electric heating wires are electrically connected with the temperature controller; an installation rack is arranged on the internal top of the rack; a fire injection shell is mounted on the installation rack; the lower part of the fire injection shell is provided with a plurality of fire spraying nozzles; a fire injector is arranged on the rack; the fire injector is connected with the fire injection shell via a fire injection pipeline; and a control switch is arranged on the fire injection pipeline. The radio frequency cable can be pre-heated; radio frequency cable cores can be rolled via the rolling wheel; and the radio frequency cable can be fused.

The invention discloses a concrete pre-embedded pile for soft foundation reinforcement, and belongs to the technical field of pre-embedded pile reinforcement. According to the concrete pre-embedded pile for soft foundation reinforcement, the scheme is that a pre-embedded pile is pre-embedded into soft soil, and concrete with a temperature is filled into a guide hole, so that concrete is in contactwith a cylindrical gasbag after entering an internal cavity, ammonium hydrogen carbonate in the cylindrical gasbag is heated to decompose and expand and gas pressure at the lower side of the cylindrical gasbag is increased, and therefore, a pre-sealed film is cracked; under return action of an elastic telescopic pole, a deformed rubber bag is extruded towards the outer side, and a contact circular plate is in continuous mutual friction with a spherical gasbag, so that calcium hydrogen carbonate in the spherical gasbag is heated to decompose, the spherical gasbag continuously expands through mutual friction between calcium hydrogen carbonate and quartz sand powder, and a contact area between turned-over deformed rubber bag and soil is increased, and therefore, sink of the pre-embedded pilecan be effectively relieved.

The invention relates to a composite material with heat accumulation function, which comprises (by weight ratio) tourmaline ultramicro powder 25-50%, caloric powder 40-65%, adhesive 2-5%, embedding agent 1-5%. The process for preparation comprises raw material preparation, mixing, and press forming, wherein the pressure for press forming is 12-30 MPa.

The invention discloses biological coal, and belongs to the technical field of biomass carbonization. Coal ash, domestic sludge and corncobs are used as raw materials; modification is performed through the operations of ventilation preheating, high-temperature pyrolysis, carbonate liquid soaking and the like; the volatile matters in sludge are reduced; the aromatization degree and the crystallization degree are enhanced; along with the temperature improvement, the activation energy is reduced; the pyrolysis is facilitated, so that the charcoal ingredients are fully burned; the heat generationenergy efficiency is greatly improved; then, starch and oxidized graphene are used as raw materials; starch molecular chains generate crosslinking, so that the surface of a starch wall material of a porous structure is compacter; the oxygen storage quantity of the biological coal system is increased; in the use process, the starch and the oxidized graphene are combustibles; the oxidized graphene is heated and can fast generate free radicals; the combustion promoting effect is achieved. The problems that the heat value of the existing biological coal is insufficient, and the stability is poor during the storage are solved.

The invention discloses a biomass fuel waste heat recycling cooking range which comprises a hearth defined by high temperature resistant materials and an air blower. A grate bridge is arranged at the bottom of the hearth, an opening for containing a heated body is formed in the top of the hearth, an ash accumulating cavity is formed below the grate bridge, a feeding opening is formed in the hearth and extends out of the wall of the hearth through a pipe or a hopper, and an air outlet of the air blower is communicated with the ash accumulating cavity through a pipe. The biomass fuel waste heat recycling cooking range further comprises a waste heat recycling cavity, hot air pipes and an induced draft fan. The heated body is connected with the top of the hearth in a sealed mode to form a heating area, the waste heat recycling cavity is arranged to surround the hearth and separated from the heating area at the top of the hearth, the hot air pipes are arranged in the waste heat recycling cavity, one ends of the hot air pipes extend out of the waste heat recycling cavity to be communicated with the heating area at the top of the hearth, and the other ends of the hot air pipes extend out of the waste heat recycling cavity to be communicated with the induced draft fan. The biomass fuel waste heat recycling cooking range is convenient to use, and heat generated by burning biomass particle fuel can be sufficiently used.

The invention relates to an alcohol group steam generator, in particular relates to a steam generation heating device for combusting alcohol group fuels, and discloses an alcohol group steam generator of which three layers of vertical combustion bins are fixed on a furnace head, and one sides of the vertical combustion bins are provided with pressure stabilizing chambers. Under the same alcohol group fuel materials and the same volume, the heat production efficiency can be improved; the production cost can be lowered; steam can be generated rapidly (for example, steam can be generated within 100 seconds at the volume of 50*40*80 ); heat start is rapid ( heat can start in 5 seconds); pressure in the combustion bins is stable, safe and reliable; discharged heat and waste gas are less; and water is added automatically, and the water level and liquid level of the vertical combustion bins are automatically controlled, and the dangerous phenomena of dryout and the like cannot happen.

The invention provides a magnetic energy-storage composite material, a preparation method and application thereof. The magnetic energy-storage composite material comprises the following components in percentage by weight: 40-88 percent of permanent magnet alloy powder, 5-40 percent of energy storage powder, 5-40 percent of six-ring rock powder and 1-5 percent of adhesive. By adopting the components and the proportion, the magnetic energy-storage composite material has magnetic therapy health effect and an energy-storage heating function at the same time, has high strength, enduring heat production efficiency, safety, reliability, no any toxic side effects and no pollution, can spontaneously generate heat and can be widely used for medical care or energy storage.

The invention provides an efficient anti-chassis icing fin heat exchanger and a working method thereof. The efficient anti-chassis icing fin heat exchanger comprises a fin, a variable resistance heating belt, an anti-freezing working medium pipe and a cold and hot transfer heat pipe, wherein the inner bottom of the fin traverses the anti-freezing working medium pipe, one side of the bottom of thefin is provided with the variable resistance heating belt, and the other side of the bottom of the fin is provided with the cold and hot transfer heat pipe. According to the efficient anti-chassis icing fin heat exchanger, icing and frosting phenomena of the bottom of the fin are completely eradicated, and furthermore, the heat generating performance and energy efficiency of a unit can be improved. By means of the linkage operation among the four-weight modes, the unit can stably and efficiently continuously produce heat, and the negative influence caused by frequent defrosting of the unit isavoided.

The invention discloses a method for screening and matching an insulating and heat-insulating material and a nano-crystalline metal material in a nano current channel layer. The method comprises the following steps: determining the insulating and heat-insulating material according to a material selection principle; establishing a crystal model according to the insulating material, heating the crystal model to melt the crystal model, cooling the crystal model to a preset first temperature, and operating the crystal model for a preset first time to obtain an amorphous model; calculating the formation energy, mean square displacement and radial distribution function of selected nano current channel material atoms in the model according to the amorphous model; and screening a material suitable for growing and gathering in the insulating and heat-insulating material according to the formation energy, the mean square displacement and the radial distribution function. The nano current channel layer prepared from the material screened by the method is an insulating layer containing metal nano crystal grains penetrating through the film thickness of the nano current channel layer, and the current only flows between the electrode layer and the phase change layer through a nano current channel formed by the metal nano crystal grains; and the power consumption of the phase-change memory can be obviously reduced.

The invention discloses a phase change memory based on a nano current channel. A used nano current channel layer structure is used for limiting the path of a current, so that the current enters a phase change layer from a high-conductivity nano crystal grain when flowing through the layer, and the current is limited in the nano current channel. According to the nanoscale conductive channel, the contact area between the phase change layer and the electrode layer is greatly reduced, the current density of a local contact part is greatly improved, and the heat production efficiency of current in the phase change layer is improved. And meanwhile, the insulating heat-insulating material with low conductivity and low heat conductivity prevents heat in the phase change layer from being dissipated to the electrode layer, so that the electric heat utilization efficiency of the phase change layer is improved. Compared with a phase change unit which is as small as possible and manufactured by adopting a more advanced manufacturing process, the phase change memory can break through the process limitation, further reduces the effective contact area of the electrode and the phase change material, and is simple in process, so the phase change memory easily realizes the reduction of operation power consumption.

The invention provides a honeycomb-type flow channel double-sided huffing PVT assembly which is composed of an aluminum huffing heat exchange plate, an EVA adhesive film, a black photovoltaic back plate, an EVA adhesive film, a photovoltaic cell assembly, an EVA adhesive film and a tempered glass plate from bottom to top, and the aluminum huffing heat exchange plate, the black photovoltaic back plate, the photovoltaic cell assembly and the tempered glass plate are laminated and bonded at high temperature through the EVA adhesive films. And an aluminum alloy frame is used for packaging and forming. The module can generate heat while generating electricity, and the temperature of the photovoltaic cell is reduced in the heat generation process, so that the electric efficiency of the photovoltaic cell is improved. The honeycomb-type flow channel double-sided heat exchange plate increases the turbulence level of an internal circulating working medium, improves the heat absorption capability of the aluminum double-sided blowing-up heat exchange plate, greatly reduces the temperature of the photovoltaic cell, and further improves the electrical efficiency of the photovoltaic cell. According to the assembly, solar energy is deeply developed and utilized, and the thermoelectric efficiency of solar energy utilization is improved.

The invention discloses a composition for preventing and controlling cold damage, food containing the composition and an application of the composition or the food, and belongs to the technical fieldof food production. The composition is prepared from [6]-gingerol, piperine and cinnamaldehyde; and the food containing the composition is used to prepare a beverage preparation, and the beverage preparation includes the following components: 2 parts by mass of the [6]-gingerol, 1.6 parts by mass of the piperine, 1.0 part by mass of the cinnamaldehyde, 0.4 part by mass of pectin, 0.3 part by massof sodium carboxymethyl cellulose, 0.05 parts by mass of citric acid, 0.04 part by mass of aspartame and 1000 parts by mass of purified water. The composition provided by the invention does not contain toxic ingredients, can better increase the body heat-generating effect, and can be used to prevent and treat the cold damage; and the components have a synergistic effect, so that the use amount ofa drug is reduced, and the problems that a current drug for preventing and treating cold damage contains multiple medicine flavors, a large dosage and toxic ingredients are solved.

The embodiment of the invention relates to a bone cement with a high heat generating efficiency. The bone cement is prepared from, by mass, 0.2-1.0% of magnetic nano-partilces MxFe3-xO4, wherein in the magnetic nano-partilces MxFe3-xO4, M is one or a mixture of several of cobalt, manganese and zinc, and the value range of X is 0.1-1. In the bone cement, the magnetic nano-partilces with the high heat generating efficiency are added, high heating efficiency can be achieved with a small adding amount when the product of the frequency (f) and the strength (H) of a magnetic field is smaller than 5*10<9> Am-1s-1, the effect of killing tumor cells can be achieved, and the heating efficiency is within the safe range capable of being borne by the human body.

The invention discloses an anti-condensation structure for the inner wall of a lampshade of a street lamp, belonging to the field of street lamps. The anti-condensation structure comprises a lampshade body, wherein a mounting seat is arranged in the lampshade body, an illuminating lamp is arranged on the mounting seat, a first rotating shaft is rotatably connected in the lampshade body, a wind pendulum is arranged on the first rotating shaft, a gas pumping and exhausting mechanism is arranged in the lampshade body, the first rotating shaft is provided with a first driving mechanism used for driving the gas pumping and exhausting mechanism, the lampshade body is internally provided with a gas bin, a heating mechanism is arranged in the gas bin, the gas bin is internally and rotatably connected with a second rotating shaft, and the second rotating shaft is provided with a second driving mechanism used for driving the heating mechanism. According to the invention, the arrangement of the wind pendulum, the first rotating shaft, the first driving mechanism, the gas pumping and exhausting mechanism and the gas bin facilitates gas collection, the arrangement of the second driving mechanism and the heating mechanism facilitates the heating of the gas collected in the gas bin, and the arrangement of a gas ejector pipe facilitates the exhausting of hot gas into the lampshade body, and water in the lampshade body is heated, gasified and discharged.

The invention relates to a solar house system, in particular to a solar house system suitable for the severe cold area. The solar house system aims at solving the problems that as for an existing town solar house in the severe cold area, the heating temperature of an indoor heated brick bed is low in winter, fresh air does not exist indoors, the air quality is poor, and due to solar radiation, the solar house is overheated in summer, and the indoor heat comfort is influenced. The solar house system comprises a passive solar house, a hung brick bed, a fresh air fan, a smoke discharging channel, a buried pipe, stop valves, refrigerant circulating pipes and a heat preservation water tank. Three direct benefiting windows are installed in the passive solar house, two first solar heat collecting walls and two second solar heat collecting walls are arranged on the passive solar house, the hung brick bed is installed in the passive solar house, one end of the buried pipe extends out of the ground, the other end of the buried pipe is inserted into the smoke discharging channel and extends into the solar house, the fresh air fan is installed at the position, located at the ground, of the buried pipe, the refrigerant circulating pipes are arranged in an air heat channel and the heat preservation water tank, and the stop valves are installed on the refrigerant circulating pipes. The solar house system is used for the town solar house in the severe cold area.

The invention discloses a biomass heating furnace with automatic feeding, which includes a furnace body, a storage bin, etc. A baffle plate with a spring is arranged between the combustion chamber and the ash chamber, and a sensor is installed on the baffle plate. The storage bin is located directly above the axis of the furnace body, and is connected to the combustion chamber through the feeding mechanism located below the storage bin, and the combustion chamber communicates with the oxygen supply mechanism and the flue. The water jacket is located outside the combustion chamber. The combustion chamber is provided with a metal mesh. The metal mesh is in the shape of a cone as a whole, with the middle protruding upwards. One end of the metal mesh extends out of the furnace body, and the other end is provided with a spring. The beneficial effects of the invention are: the storage bin and the feeding mechanism are installed on the axis of the furnace body, and with the conical metal mesh, the biomass fuel can be more evenly distributed in the combustion chamber, and the metal mesh makes the biomass fuel layered Combustion, the combustion of biomass fuel is more complete, which improves the heat production efficiency of biomass fuel.

The invention discloses an alcohol-based fuel automatic proportioning combustion system comprising a combustion device and an oil supply device; the combustion device is used for combusting alcohol-based fuel and providing heat; the oil supply device is used for providing the alcohol-based fuel for the combustion device, wherein the oil supply device comprises an oil supply pipe and a fuel conveying device; an outlet of the oil supply pipe is connected with the combustion device; the fuel conveying device comprises at least two storage tanks, at least two oil supply pumps and at least two first valves; one of the two storage tanks is used for storing methanol, and the other storage tanks are used for storing additives; the oil supply pumps are arranged in one-to-one correspondence with thestorage tanks, and an inlet of each oil supply pump communicates with the corresponding storage tank; and the first valves are arranged in one-to-one correspondence with the oil supply pumps, an inlet of each first valve is connected with an outlet of the corresponding oil supply pump, and an outlet of each first valve is connected with an inlet of the oil supply pipe. The alcohol-based fuel adopting the combustion system disclosed by the invention can be used immediately after being prepared, so that the phenomena of layering, non-uniform mixing and the like are avoided, and the alcohol-based fuel can be normally and sufficiently combusted.

The invention discloses a warm air furnace having an automatic residue discharge function. The warm air furnace comprises a furnace body, a storage bin, a feeding mechanism, a heat exchange chamber, a water jacket, a water pipe, an air pipe, a flue, an oxygen supply mechanism and a controller; a combustion chamber and an ash chamber are formed in the furnace body; the ash chamber is located below the combustion chamber; a baffle with a spring is arranged between the combustion chamber and the ash chamber; metal meshes are arranged in the combustion chamber; one end of each metal mesh stretches out of the furnace body; springs are arranged at the other ends of the metal meshes; and the controller is located on the furnace body and is connected with a sensor and a control motor of the feeding mechanism. The warm air furnace has the beneficial effects that the metal meshes are arranged in the combustion chamber, and biomass fuel undergoes stratified combustion due to the metal meshes and is combusted more fully, so that the heat production efficiency of the biomass fuel is improved; and the spring and the sensor are arranged on the baffle between the combustion chamber and the ash chamber, and when a certain amount of residues is accumulated on the baffle, the baffle is opened automatically, so that the baffle is more convenient than a grate.

The invention discloses a rapid degradation method for corrodible organic solid wastes. According to the invention, organic solid wastes are divided into different batches according to the different time of entering a biochemical bin; and the organic solid wastes in a next batch tightly contact with the edges of the organic solid wastes in a previous batch after entering the biochemical bin. By utilization of the method provided by the invention, the degradation time of the organic solid wastes can be significantly shortened; rapid treatment of the organic solid wastes is realized; and the harm to the environment is reduced.

The invention discloses a high-temperature heater which comprises the components of a first heating tube, a second heating tube and a third heating tube. The first heating tube, the second heating tube and the third heating tube are vertically and parallelly arranged. The first heating tube, the second heating tube and the third heating tube are connected for forming a W-shaped member. The lengths of the first heating tube, the second heating tube and the third heating tube are respectively 10-15cm. A first heating wire winds on the outer surface of the first heating tube. A second heating wire winds on the outer surface of the second heating tube. A third heating wire winds on the outer surface of the third heating tube. The high-temperature heater has advantages of simple structure, convenient use, high heat generating speed and high heating effect.

The invention discloses a vertical solar water heater, comprising a water storage tank and a glass tube unit composed of a plurality of communicated glass tube units, each glass tube unit is coated with a heat transfer coating; each glass tube unit comprises an incoming water pipe and an incoming water pipe and an outgoing water pipe; the water storage tank is provided with a cold water pipe and ahot water pipe; the glass tubes are mounted in a square frame in parallel manner; both the top and bottom of the square frame are of open structure; the square frame is obliquely mounted on a support; the water storage tank is mounted below the square frame; a reflecting plate is arranged at each end of the top of the water storage tank; the reflecting face of each reflecting plate faces the glass tube units; the height of the reflecting plates is not less than 1 / 2 of the height of the top end of the glass tube units. The vertical solar water heater has the advantages that it can be ensured that all sides of the glass tubes can receive sunlight, heat production efficiency is high, and effectively utilization rate of solar energy can be increased.

The invention discloses a stirring head with depth variation for a stirring area of friction stir welding. The stirring head comprises a clamping part, a shaft shoulder part and a stirring pin in sequential connection, wherein the end face of the shaft shoulder part comprises an enveloping area far away from the stirring pin in the radial direction and further comprises the stirring area; and thestirring area is used for enlarging the friction moment, has depth variation at least in the circumferential direction and is close to the stirring pin in the radial direction. The stirring head has the advantages of improving the stirring and heat generating effect, avoiding a welding defect and enlarging the stirring force.

The invention discloses a dielectric medium for a wave energy molecular oscillation heat collector. The dielectric medium comprises a dielectric medium shell; a powder dielectric medium which is filled in the dielectric medium shell and wraps a fin type metal tube, wherein the powder dielectric medium comprises a first material and a second material, the first material is powder silicon powder, the second material is powder carbon powder, and the mass ratio of the first material to the second material is (1-4): 1.