TWM511607U - Thermoelectric burner - Google Patents

Description

Thermoelectric burner

This creation is related to thermoelectric conversion technology, which refers to a thermoelectric combustion furnace with a thermoelectric wafer protection mechanism.

Gasifiers (also known as furnaces) are combustion devices that use biomass materials (branches, leaves, paper, etc.) as fuel to provide users with thermal energy. Generally, the combustion furnace has a difference between a single-layer furnace and a double-layer furnace. The furnace body of the double-layer furnace includes an inner barrel and an outer barrel, and the inner barrel serves as a combustion chamber, and the outer barrel is generally used for heat insulation to prevent burns of the user. The high temperature during combustion causes the gasification effect of the biomass material. The gasified gas has flammable gas and non-flammable gas. The flammable gas mainly contains carbon monoxide, hydrogen and methane, and the non-flammable gas mainly contains carbon dioxide and nitrogen. Among them, carbon monoxide, hydrogen and methane are quite good fuels. Traditional farmhouses use furnaces to provide household heat or as a source of household gas fuel for cooking, power generation or heating. Because the gasifier uses the characteristics of raw materials, it is very suitable for outdoor activities such as mountaineering, camping and other fire heating, cooking and power generation. At present, the volume and weight are reduced to a smaller gasifier that can be carried by a single person ( The sales volume of the burners is also increasing year by year.

Generally, the gasifier uses the characteristics of raw materials, which is suitable for outdoor activities such as mountaineering, camping, etc., for heating, cooking, etc. After the ignition of the gasifier is started, it is necessary to continuously input the raw fuel to generate heat for heating and cooking. use. When modern people engage in outdoor activities such as hiking, hiking or camping for leisure and entertainment, in addition to carrying basic electrical appliances such as lighting flashlights or emergency communication radios, more and more popular portable 3C products such as tablet computers, smart phones, etc. Electronic devices use batteries as a source of energy, so the demand for charging for outdoor activities is gradually increasing. However, when the user operates in the field, the power is not easy to obtain, and it is necessary to carry components with power storage or power generation, such as mobile power, batteries and small generators, for lighting or 3C product charging needs. However, the location of hiking is often remote, the utility power or power generation equipment is not easy to reach, and users must carry a variety of equipment to increase personnel troubles and burdens. Therefore, there are many products for burning gasifiers with additional power generation devices on the market to meet the outdoor. The charging needs of field activities.

The most commonly used power generation device for a gasification burner is a thermoelectric wafer (or a cryogenic wafer), which generates a "Sbeck effect" output current by the temperature difference between the hot end (high temperature end) and the cold end (low temperature end) of the wafer. The burner with the thermoelectric wafer can be converted into electric energy by using the heat energy generated by the burning material while heating or cooking, and provides charging of electronic products such as USB, mobile phones, GPS positioning systems, or as lighting equipment such as halogen lamps and LED lamps. Power usage. At present, the electric furnace with thermal power generation function can output about 2W to 5W, and the electric energy output is limited by the conversion efficiency of the thermoelectric wafer itself, the heat conduction and heat dissipation design of the combustion furnace body, and most of them can only provide a small power output.

U.S. Patent No. 8,829,271 discloses a portable combustion apparatus using a TEG (thermoelectric wafer) having a heat conducting rod that conducts heat inside the furnace body to the hot end of the thermoelectric wafer to heat the hot end. The speed is faster, the cold end of the thermoelectric chip is connected to the heat sink, and the external cold air is blown to the heat sink by the fan to cool the cold end of the thermoelectric chip, and the temperature difference between the two ends of the thermoelectric wafer is maintained to improve the electric energy conversion efficiency, and the hot air is introduced into the burning furnace. Internal to increase combustion efficiency. The disadvantage of this patent is that the heat conducting rod directly transfers the high heat inside the furnace body to the thermoelectric chip. If the burning temperature is too high, exceeds the allowable working range of the thermoelectric chip, and even the pyroelectric chip burns out; the cold end and the hot end of the thermoelectric chip must be at both ends. Maintaining a certain temperature difference can optimize the working efficiency. The hot end temperature depends on the heat source and the cold end temperature depends on the heat dissipation efficiency of the heat sink. The heat dissipation efficiency of the heat sink depends on the heat sink material, air contact area, quantity and configuration. In theory, the more the number of heat sinks is, the larger the contact area with air is, the higher the heat dissipation efficiency is. However, the excessive number of sheets will increase the air intake resistance, but reduce the heat dissipation effect, and the heat sinks in different positions and directions. The amount of air that can be contacted is also different, resulting in uneven heat distribution affecting the heat dissipation effect and reducing the conversion efficiency of the thermoelectric wafer. If the number of heat sinks is increased, the volume, weight and cost will inevitably increase, and the processing difficulty will also increase, which is not conducive to manufacturing and sales.

A heat pipe, or heat pipe, is a special material with fast uniform temperature characteristics. The empty metal pipe body makes it light in weight, and its fast uniform temperature characteristics make it excellent. The thermal superconducting performance; the application of heat pipes is quite extensive, and it was first used in the aerospace field. It has been widely used in various heat exchangers, coolers, natural geothermal references, etc., and plays the role of rapid heat conduction. The most common and efficient thermal (non-heating) component in electronic product heat sinks. The heat pipe is a closed cavity containing an actuating fluid The body has a heat absorbing end and a heat releasing end, and the liquid-vapor two-phase change of the working fluid continuously circulating in the cavity, and the convection of the vapor-liquid fluid to the liquid return between the heat absorbing end and the heat releasing end, so that the surface of the cavity is presented Fast cooling characteristics for heat transfer purposes. The action mechanism of the heat pipe is: the liquid phase actuating fluid evaporates into a vapor phase at the endothermic end, and this moment generates a local high pressure in the cavity, drives the vapor phase actuating fluid to flow to the heat release end at a high speed, and the vapor phase actuating fluid condenses into a liquid phase at the heat releasing end. , by gravity / capillary force / centrifugal force ... back to the endothermic end, cycle action. The advantages of the heat pipe include high heat transfer efficiency; large heat transfer capacity, and can transfer more heat under a small temperature difference; small volume, light weight, compact structure; wide temperature range; adjustable heat flow density; unrestricted heat source; The quality cycle has no power consumption.

In view of the shortcomings of the conventional technology, the present invention provides a thermoelectric combustion furnace for converting thermal energy generated by burning fuel into electrical energy by a thermoelectric wafer. The thermoelectric combustion furnace of the present invention uses a heat pipe as a heat transfer medium and has a heat flux changeable. The heat conducting unit can keep the temperature difference between the two ends of the thermoelectric wafer in an optimal working temperature range, and protect the thermoelectric chip from burning failure due to overheating.

The present invention provides a thermoelectric combustion furnace comprising: a furnace body; one or more thermoelectric wafers disposed on one side of the furnace shell to convert thermal energy generated by the furnace body into electrical energy output; one or more heat pipes are disposed on On the side of the furnace casing, the heat pipe has a heat absorbing end and a heat releasing end, the heat absorbing end is connected to the thermoelectric chip; an air intake unit is a hollow casing, and is disposed in the furnace a body side and covering the heat release end of the heat pipe; and a fan, The fan sends outside air into the interior of the air intake unit to remove heat from the heat release end of the heat pipe.

The present invention provides a thermoelectric combustion furnace, wherein the furnace system can be a double-layer furnace, the double-layer furnace includes an inner layer furnace and an outer layer furnace, and the inner layer furnace and the outer layer furnace have a space for allowing air to flow. a space that communicates with an internal space of the air intake unit, the fan sends external air into the air intake unit to take away heat of the heat release end of the heat pipe, and then sends the heated hot air to the inner layer. a space between the furnace and the outer layer furnace; the inner layer of the inner wall of the furnace is provided with a plurality of openings, the side of the opening is outwardly provided with a baffle, and the air flowing in the space is blocked by the baffle to change the flow The direction enters the interior of the inner furnace through the opening to increase combustion efficiency.

The present invention provides a thermoelectric combustion furnace, further comprising: a heat conduction unit disposed between the furnace body and the thermoelectric wafer, wherein the temperature is changed from the furnace body to the thermoelectric wafer The heat flux of the thermoelectric chip prevents the pyroelectric wafer from burning out due to excessive temperature, and maintains the thermoelectric wafer in an operating temperature range in which the thermoelectric conversion efficiency is optimized; the heat conducting unit can be formed by combining two kinds of metals a thermocouple element, or other device that alters the heat flux; the thermally conductive unit can linearly vary the heat flux delivered to the thermoelectric wafer, or change the heat flux transmitted to the thermoelectric wafer in stages, or The temperature is directly broken and no longer transferred to the thermoelectric wafer to achieve the effect of protecting the thermoelectric wafer and maintaining optimum thermoelectric conversion efficiency.

The creation system provides a thermoelectric combustion furnace in which the inside of the furnace body The bottom part is provided with a heat collecting column, which can guide the heat of the furnace body to the center of the combustion zone inside the furnace body to improve the combustion effect.

The present invention provides a thermoelectric burner in which the electrical energy generated by the thermoelectric wafer can be used to drive the fan or be stored for other uses. The thermoelectric combustion furnace of the present invention may further include: an energy storage unit connected to the thermoelectric wafer for storing electrical energy generated by the thermoelectric wafer; and a power transmission unit connected to the energy storage unit, Outputting the electric energy in the energy storage unit or inputting external electric energy into the energy storage unit; the electric energy transmission unit may be a wireless charging device, a USB connector, a cigarette lighter connector for a vehicle, or other types of wired power transmission devices. It can be changed according to user needs to meet the charging and discharging requirements of different electronic products.

The above summary and the following detailed description and drawings are intended to further illustrate the manner, means and effects of the present invention in achieving its intended purpose. Other purposes and advantages of this creation will be set forth in the following description and illustration.

11‧‧‧ furnace body

12, 23‧‧‧ Thermoelectric wafer

13, 24‧‧‧ heat pipe

131, 241‧‧‧heat pipe end

132, 242‧‧‧heat pipe heat release end

14, 25‧‧‧Air intake unit

141, 251‧‧‧ fans

15, 26‧‧‧ Thermal Conductive Unit

16, 27‧‧ ‧ collector column

21‧‧‧Inner furnace

22‧‧‧outer furnace

28‧‧‧ Energy storage unit

29‧‧‧Power Transfer Unit

Fig. 1 is a structural view showing a first embodiment of the thermoelectric combustion furnace of the present invention.

Fig. 2 is a structural view showing a second embodiment of the thermoelectric combustion furnace of the present invention.

The embodiments of the present invention are described below by way of specific specific examples, and those skilled in the art can readily appreciate the other advantages and effects of the present invention from the disclosure herein.

1 is a structural view of a first embodiment of the thermoelectric combustion furnace of the present invention. As shown in the figure, the first embodiment includes: a furnace body 11; one or more thermoelectric wafers 12 are disposed on the outer casing of the furnace body 11. On the side, the heat energy generated by the furnace body 11 is converted into an electric energy output; one or more heat pipes 13 are disposed on one side of the furnace body casing, and the heat pipe system has a heat absorption end 131 and a heat releasing end 132, and the heat absorption end is connected. The thermoelectric wafer 12; an air intake unit 14 is a hollow housing disposed on one side of the furnace body and covering the heat releasing end 132 of the heat pipe 13; a fan 141, the fan 141 The external air is sent into the interior of the air intake unit 14 to take away the heat of the heat pipe end 131; a heat conducting unit 15 is disposed between the furnace body 11 and the thermoelectric chip 12, According to the temperature of the thermoelectric wafer 12, the heat flux transferred from the furnace body 11 to the thermoelectric wafer 12 is changed, the pyroelectric wafer 12 is prevented from being burnt due to excessive temperature, and the thermoelectric wafer 12 is maintained in thermoelectric conversion efficiency. Optimized operating temperature range; wherein the air intake unit 14 The air which is heated by absorbing the heat of the heat releasing end of the heat pipe 131 can be introduced into the furnace body 11 to increase the combustion efficiency; the bottom of the furnace body 11 can be provided with a heat collecting column 16 which can be used for the furnace body 11 The heat is directed to the center of the combustion zone within the furnace to increase the combustion effect; the electrical energy generated by the thermoelectric wafer 12 can be used to drive the fan 14, or stored for other uses.

2 is a structural view of a second embodiment of the thermoelectric combustion furnace of the present invention. As shown in the figure, the second embodiment includes: a furnace body having an inner layer furnace 21 and an outer layer furnace 22, Inner layer furnace 21 and outer layer furnace 22 The interlayer has a space for allowing air to flow, and the side wall of the inner layer furnace 21 is provided with a plurality of openings 211; one or more thermoelectric chips 23 are disposed on one side of the furnace body to convert the heat energy generated by the furnace body into An electric energy output; one or more heat pipes 24 are disposed on one side of the furnace body, the heat pipe 24 has a heat absorbing end 241 and a heat releasing end 242, the heat absorbing end 241 is connected to the thermoelectric chip 23; an air intake unit 25, The air intake unit 25 is a hollow housing disposed on one side of the furnace body. The heat pipe heat release end 242 is disposed through the air intake unit 25; a fan 251 that sends outside air into the air intake unit The heat receiving unit 26 is disposed inside the air inlet unit 25 to remove the heat of the heat pipe end 242; the heat conducting unit 26 is disposed between the furnace body and the thermoelectric chip 23, and the temperature of the thermoelectric chip 23 is High and low, changing the heat flux transferred from the furnace body to the thermoelectric chip 23, preventing the pyroelectric wafer 23 from burning out due to excessive temperature, and maintaining the thermoelectric wafer 23 in an operating temperature range in which the thermoelectric conversion efficiency is optimized; The inner bottom of the inner layer furnace 21 is A heat collecting column 27 is provided, which can guide the heat of the inner layer furnace 21 to the center of the inner combustion zone of the inner layer furnace to improve the combustion effect; the energy storage unit 28 is used for the energy storage unit 28 The power generated by the thermoelectric chip 23 is stored; the power transfer unit 29 is connected to the energy storage unit 28, the electrical energy in the energy storage unit 28 is output, or external power is input to the energy storage unit 28; The power transmission unit 29 can be a wireless charging device, a USB connector, a cigarette lighter connector for a vehicle, or other types of wired power transmission devices, which can be changed according to user requirements to meet the charging and discharging requirements of different electronic products.

In the second embodiment of the present invention, the space between the inner layer furnace and the outer layer furnace and the inner space of the air intake unit 25 are mutually circulated, and the fan 251 sends outside air into the air intake unit 25 to take away the The heat of the heat pipe releasing end 242 is sent to the space between the inner layer furnace and the outer layer furnace to increase the combustion efficiency.

In the second embodiment of the present invention, the side wall opening 211 of the inner layer furnace 21 is provided with a baffle outwardly, and the air flowing in the space between the inner layer furnace and the outer layer furnace is subjected to the block. The sheet is blocked, and the flow direction is changed to enter the inside of the inner layer furnace 21 through the opening 211, thereby increasing the combustion efficiency.

Generally, the hot end and the cold end of the thermoelectric chip have a limitation of the operating temperature range, and a certain temperature difference between the hot end and the cold end is required, and the thermoelectric wafer can have the best thermoelectric conversion efficiency, so the heat dissipation mechanism of the thermoelectric wafer is extremely important. The author uses the heat pipe as the heat transfer medium of the cold end of the thermoelectric wafer, and utilizes the heat transfer efficiency of the heat pipe to quickly transfer the excess heat of the cold end of the thermoelectric chip, so that the temperature difference between the hot end and the cold end of the thermoelectric chip is maintained on the wafer. Improve and maintain the thermoelectric conversion efficiency of thermoelectric wafers within the optimal operating temperature range. The heat pipe is a closed cavity containing an actuating fluid, which has a heat absorbing end and a heat releasing end, and the liquid and vapor two-phase change of the circulating fluid in the cavity is continued, and the steam & liquid fluid flows between the heat absorbing end and the heat releasing end. The convection of the liquid return causes the surface of the cavity to exhibit a rapid average temperature characteristic and achieve the purpose of heat transfer. Compared with the traditional single-material heat sink, the heat pipe used in this creation has a fast heat transfer, and it is not necessary to design a multi-chip heat dissipation unit with complicated configuration and bulk, and there is no heat distribution in different parts of the heat sink. The situation is different, resulting in uneven heat dissipation. The heat pipe of the heat pipe disposed in the air intake unit takes up a small space, and does not cause excessive resistance to the air flowing into the air intake unit to affect the air intake efficiency. As long as the number of heat pipes is increased or decreased, or other heat dissipating devices such as heat sinks, cooling fans, liquid-cooled radiators, etc., can be adapted to the needs of different sizes of burners, with low production difficulty and high flexibility.

At the same time, the creation has a protection mechanism for avoiding overheating of the temperature of the thermoelectric wafer. The existing combustion furnace products with thermal power generation function have the thermoelectric wafer directly locked on the furnace body, or the furnace is fixed by a fixed heat conduction rod, a heat conducting sheet and the like. The body heat is continuously transferred to the thermoelectric chip. Although this configuration has the advantage of rapid heat transfer, the thermoelectric wafer has its maximum operating temperature limit, usually not exceeding 200~300 °C, even if the thermoelectric wafer is continuously heated to exceed the wafer. The preset operating temperature range not only fails to improve the thermoelectric conversion efficiency, but even burns or fails the thermoelectric chip. In order to solve the prior art problem, the present invention has a heat conducting unit, which can change the heat flux transmitted from the furnace body to the thermoelectric chip according to the temperature of the thermoelectric chip, and prevent the thermoelectric wafer from being overheated. High and burn-out failure, and maintain the thermoelectric wafer in an operating temperature range where thermoelectric conversion efficiency is optimized. The heat conducting unit can be a thermocouple element formed by combining two kinds of metals, or other device capable of changing heat flux; the heat conducting unit can linearly change the heat flux transmitted to the thermoelectric chip, or the phase change transmission The heat flux to the thermoelectric wafer, or directly at a particular temperature, is no longer transferred to the thermoelectric wafer to achieve the effect of protecting the thermoelectric wafer and maintaining optimum thermoelectric conversion efficiency.

The above-described embodiments are merely illustrative of the features and functions of the present invention, and are not intended to limit the scope of the technical content of the present invention. Any person skilled in the art can modify and change the above embodiments without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this creation should be as listed in the scope of the patent application described later.

11‧‧‧ furnace body

12‧‧‧ Thermoelectric Wafer

13‧‧‧heat pipe

131‧‧‧heat pipe end

132‧‧‧heat pipe heat release end

14‧‧‧Air intake unit

141‧‧‧Fan

15‧‧‧thermal unit

16‧‧‧Heather column

Claims (13)

A thermoelectric combustion furnace comprising: a furnace body; one or more thermoelectric wafers disposed on one side of the furnace shell to convert thermal energy generated by the furnace body into electrical energy output; one or more heat pipes are disposed in the furnace body casing On one side, the heat pipe has a heat absorbing end and a heat releasing end, the heat absorbing end is connected to the thermoelectric chip; an air intake unit is a hollow shell, which is disposed on one side of the furnace body and Covering the heat release end of the heat pipe; and a fan that sends outside air into the interior of the air intake unit to remove heat from the heat release end of the heat pipe. The thermoelectric combustion furnace according to claim 1, wherein the furnace system is a double-layer furnace, the double-layer furnace comprises an inner layer furnace and an outer layer furnace, and the inner layer furnace and the outer layer furnace system have A space that allows air to flow, and the space is in communication with the internal space of the air intake unit. The thermoelectric combustion furnace according to claim 2, wherein the inner layer furnace side ring is provided with a plurality of openings. The pyroelectric combustion furnace of claim 3, wherein the opening side is provided with a baffle outward. The pyroelectric combustion furnace of claim 1, further comprising: a heat conducting unit disposed between the furnace body and the thermoelectric wafer, depending on the temperature of the thermoelectric wafer, being changed by the furnace Pass to the body The heat flux of a thermoelectric wafer. The pyroelectric combustion furnace according to claim 5, wherein the heat conducting unit is a thermocouple element in which two metals are combined. The thermoelectric combustion furnace according to claim 1, wherein a heat collecting column is arranged on the inner bottom of the furnace body. The pyroelectric combustion furnace of claim 1, wherein the electric energy generated by the thermoelectric wafer is used to drive the fan. The pyroelectric combustion furnace of claim 1, further comprising: an energy storage unit connected to the thermoelectric wafer for storing electrical energy generated by the thermoelectric wafer. The pyroelectric combustion furnace according to claim 9, wherein the energy storage unit is a battery, a capacitor or a device capable of storing electrical energy. The thermoelectric combustion furnace of claim 9, further comprising: a power transmission unit connected to the energy storage unit to output the electric energy in the energy storage unit or input external electric energy into the electric energy storage unit Energy storage unit. The thermoelectric burner according to claim 11, wherein the power transmission unit is a wireless charging device. The thermoelectric burner according to claim 11, wherein the power transmission unit is a USB connector, a cigarette lighter connector for a vehicle, or a wired power transmission device.