Automobile exhaust waste heat thermoelectric generator device adopting phase change materials

[0014] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples, and detailed descriptions are as follows with accompanying drawings:

[0015] See figure 1 , An automobile exhaust waste heat thermoelectric power generation device using phase change materials, comprising a heat conductor 4 fixed on the exhaust pipe 2 and a thermoelectric generator 6 fixed on the heat conductor 4, the thermoelectric generator 6 The hot end is attached to the outer surface of the thermal conductor 4, a radiator 7 is provided at the cold end of the thermoelectric generator 6, and a phase is provided on the side of the thermal conductor close to the thermoelectric generator 7 The material-changing accommodating cavity is filled with the phase-change material 8.

[0016] If the structure of the phase change material accommodating cavity is not appropriate, the temperature distribution of the hot end of the thermoelectric generator may be uneven; the temperature of the hot end of the thermoelectric generator will be limited by the thermal conductivity of the phase change material. The above two aspects will lead to low power generation efficiency. In view of this problem, optimization design can be carried out through simulation calculation under certain initial conditions and boundary conditions to find the optimal phase change material cavity structure. For example, the phase change material containing cavity in this embodiment can be changed from a rectangular parallelepiped structure to a triangular prism structure. Through simulation calculation, comprehensive consideration of temperature distribution and power generation efficiency, select the best phase change material containing cavity structure. In order to improve the thermal conductivity, the phase change material 8 is filled with foamed metal. In order to effectively reduce the heat loss, increase the temperature of the hot end of the generator, and thereby increase the power generation efficiency and power, a heat preservation and heat insulation board 5 connected to the thermoelectric generator 6 is attached to the outer surface of the heat conductor 4. In order to increase the temperature of the hot end of the generator, increase the power generation efficiency and power, and facilitate the installation of the thermoelectric generator 6, the heat conductor 4 is provided with an inner circular arc surface that is attached to the exhaust pipe 4 and heats the thermoelectric generator 6 The outer plane of the end fitting; the radiator is a fin radiator 7, the plane side of the fin radiator 7 is attached to the cold end of the thermoelectric generator 6, and the fin of the fin radiator 7 The fins are consistent with the length of the car, which helps the air flow to flow through the heat exchange surfaces of the fins when the car is running. More specifically, considering the limited installation space, the heat conductor 4 is provided with a semi-circular inner arc surface that is attached to the exhaust pipe 2, and the heat conductor 4 is arranged below the exhaust pipe 2. The top and bottom ends of the body 4 are both flat, the heat conductor 4 is fixed on the exhaust pipe 2 with a semicircular hoop 1, and the hot end of the thermoelectric generator 6 is attached to the bottom of the heat conductor 4. On the end plane, the thermal insulation board 5 is attached to the top plane and the surrounding surface of the thermal conductor 4, and the thermal conductor 4, the thermal insulation board 5 and the semicircular hoop 1 are fixed by screws 3 Together. In this embodiment, the thermal conductor 4 is made of a material with high thermal conductivity, such as copper or aluminum.

[0017] The working process of the present invention is as follows:

[0018] After the car is started, high-temperature car exhaust is generated, and the thermoelectric generator 6 enters the working state. The hot end of the thermoelectric generator 6 absorbs the heat transferred by the high thermal conductivity material 4, and the cold end undergoes forced convection heat exchange through the fin-type radiator 7 to discharge the heat into the air, thereby maintaining the temperature difference between the cold and hot ends. When the operating conditions of the engine change during the driving of the car, the temperature of the exhaust pipe will change with the operating conditions of the engine, so that the temperature of the high thermal conductivity material 4 will continue to change. When the temperature of the high thermal conductivity material 4 is higher than the upper limit of the safe working temperature range of the thermoelectric generator 6, the phase change material 8 will undergo a phase change, the phase change process absorbs heat, and the temperature remains basically constant, so that the hot end temperature of the thermoelectric generator 6 Maintain below the upper limit of the safe working temperature range.

[0019] Although the preferred embodiments of the present invention are described above with reference to the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are merely illustrative and not restrictive. Under the enlightenment of the present invention, persons can make many forms without departing from the purpose of the present invention and the protection scope of the claims, and these all fall within the protection scope of the present invention.