A cylindrical automobile exhaust thermoelectric conversion device and installation method

Abstract

The invention discloses a cylindrical automobile exhaust thermoelectric conversion device and an installation method. The device comprises a thermoelectric conversion unit and a voltage inspection unit. The thermoelectric conversion unit comprises a heat exchanger. The heat exchanger comprises hot faces numbered from one to eight, a cylindrical cavity with the two ends open is defined by the hot faces numbered from one to eight, a plurality of fins are evenly arranged on the inner side of the cylindrical cavity, the hot ends of all thermoelectric modules in thermoelectric module sets numbered from one to eight are correspondingly connected to the positions, on the outer side of the cylindrical cavity, of the surfaces of the hot faces numbered from one to eight respectively, water tanks numbered from one to eight are correspondingly connected to the cold ends of all the thermoelectric modules in the thermoelectric module sets numbered from one to eight respectively, and fastening rings numbered from one to five are arranged on the outer sides of the water tanks numbered from one to eight. According to the designed regular-octagon cylindrical heat exchanger, the thermal conversion efficiency of exhaust afterheat is improved on the basis of guaranteeing that the exhaust flow backpressure in an engine is not increased.

Description

technical field [0001] The invention relates to the field of automobile exhaust temperature difference power generation devices and methods, in particular to a cylindrical automobile exhaust thermoelectric conversion device and an installation method. Background technique [0002] About 30% of the fuel energy of a traditional fuel engine is discharged as exhaust heat, resulting in a huge waste of energy. Using thermoelectric conversion technology to recover exhaust waste heat for power generation and supply to the vehicle system is an important way to improve its fuel economy. At present, most of the existing automobile exhaust power generation devices adopt a flat plate structure, that is, the heat exchanger is a flat plate, and the thermoelectric module is laid on the surface of the plate heat exchanger. However, this method has a great impact on the exhaust back pressure of the engine. It will cause the exhaust gas flow to be unsmooth, resulting in uneven heating of the h...

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Problems solved by technology

[0002] About 30% of the fuel energy of traditional fuel engines is discharged in the form of exhaust waste heat, resulting in a huge waste of energy. Using thermoelectric conversion technology to recover exhaust waste heat for power generation and supply to the vehicle system is an important way to improve its fuel economy

At present, most of the existing automobile exhaust power generation devices adopt a flat plate structure, that is, the heat exchanger is a flat plate, and the thermoelectric module is laid on the surface of the plate heat exchanger. However, this method has a great impact on the exhaust back pressure of the engine. It will cause the exhaust gas flow to be unsmooth, resulting in uneven heating of the heat exchanger, and finally the heat will affect the electrical conversion efficiency. Although a certain amount of electricity is emitted, it may also reduce the power and fuel economy of the engine. The gain outweighs the gain

[0003] In addition, the heat exchanger of cylindrical structure has also been reported, such as the Chinese utility model patent (publication number: 2031198709U, publication date: 2013-08-07) has reported the patent document titled automobile exhaust waste heat power generation device, disclosed in the document An automobile exhaust waste heat power generation device is proposed, which includes a thermoelectric generator, a heat sink and a connecting sleeve, and the inner diameter of the connecting sleeve is cylindrical, which matches the outer circle of the exhaust pipe of the automobile, and the outside of the connecting sleeve presents a hexagonal cylinder. The connecting sleeve with a hexagonal cylindrical structure is divided into two parts, the upper sleeve and the lower sleeve; Chinese utility model patent (publication number: 204652267U, publication date: 2015-09-16) has reported a kind of exhaust air temperature difference power generation The patent literature of the device discloses a thermoelectric power generation device including a double-layer semi-octagonal exhaust pipe. Both designs adopt a cylindrical double-layer structure design mode, which improves the heat exchange efficiency of exhaust gas waste heat , but the structural design is not compact enough, and it is not conducive to stabilizing the exhaust flow back pressure in the engine

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