JPH073156U - Exhaust heat power generator - Google Patents

Abstract

(57) [Abstract] [Purpose] An exhaust heat power generator using heat of exhaust gas of an engine has an object to provide a space-saving exhaust heat power generator having good power generation performance. A catalyst 21 provided in an exhaust pipe line 11 of an engine 10, a thermoelectric generator 23 attached to an outer wall 22 of the catalyst 21 so that one surface side is in contact, and a thermoelectric generator 23.
It is configured by a cooling chamber 26 that is in contact with the other surface side of the engine 10 and through which cooling water of the engine 10 flows.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an exhaust heat power generator that utilizes the heat of exhaust gas from an engine.

[0002]

[Prior art]

 Next, a conventional exhaust gas thermoelectric generator will be described with reference to FIG. In the figure, 1 is an exhaust pipe. A three-way catalyst 2 that simultaneously processes CO, HC, and N0x is installed in the exhaust pipe 1. An exhaust gas thermoelectric generator 3 using thermoelectric generators is provided in front of or behind the three-way catalyst 2.

Next, the operation of the above configuration will be described. The exhaust pipe 1 is heated by the exhaust gas discharged from the combustion chamber of the engine and is in a high temperature state (for example, 700 ° C.). Then, one surface of the thermoelectric generator element of the exhaust thermoelectric generator 3 is heated, and the thermoelectric generator element generates a thermoelectromotive force according to the temperature difference from the other surface.

[0004]

[Problems to be solved by the device]

 In the exhaust gas thermoelectric generator having the above structure, the power generation performance (thermoelectromotive force) is better as the temperature difference (temperature gradient) between one surface and the other surface of the thermoelectric power generation element is larger. However, it cannot be said that the exhaust heat power generation device configured as described above fully utilizes the energy of the exhaust gas in the exhaust pipe.

The present invention has been made in view of the above embodiments, and an object thereof is to provide a space-saving exhaust heat power generation device having good power generation performance.

[0006]

[Means for Solving the Problems]

 The present invention which solves the above-mentioned problems is directed to a catalyst provided in an exhaust pipe of an engine, a thermoelectric generator attached to the outer wall of the catalyst so that one surface thereof is in contact, and the other surface of the thermoelectric generator. It is composed of a cooling chamber that is in contact with the inside of which the cooling water of the engine flows.

[0007]

[Action]

 In the exhaust gas thermoelectric generator of the present invention, one surface of the thermoelectric generator that is in contact with the outer wall surface of the catalyst is heated, and the other surface of the thermoelectric generator that is in contact with the cooling chamber is cooled, and the two surfaces of the thermoelectric generator are Thermoelectromotive force is generated by the temperature gradient generated between the surfaces.

[0008]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional configuration diagram for explaining an embodiment of the exhaust gas thermoelectric generator of the present invention, and FIG. 2 is a diagram for explaining mounting of the exhaust gas thermoelectric generator shown in FIG.

First, in FIG. 2, 10 is an engine, 11 is an exhaust pipe that guides the exhaust gas discharged from the combustion chamber of the engine 10 to the outside, and 12 cools the engine, and cools high-temperature cooling water. It is a radiator. An exhaust heat power generation device 13 is provided in the pipeline of the exhaust pipe 11. A first radiator hose 14 that sends the cooling water to the exhaust heat power generation device 13 is attached to the outlet side of the radiator 12 (the port through which the cooled cooling water exits). Further, 15 is a second radiator hose that sends the cooling water discharged from the exhaust heat power generator 13 to the water jacket of the engine 10, and 16 is a third radiator hose that returns the cooling water that has cooled the engine 10 to the radiator 12. Is. The cooling water is circulated by a water pump provided in the engine 10.

Next, referring to FIG. 1, the exhaust thermoelectric generator 13 of this embodiment will be described. A catalyst 20 is provided in the conduit of the exhaust pipe 1 and purifies the exhaust gas. A plurality of thermoelectric generators 23 are provided on the surface of the outer wall 22 of the catalyst 21. A first electrode 24 that contacts the outer wall 27 of the catalyst 21 is formed on one surface side of the thermoelectric generator 23. A second electrode 25 is formed on the other surface side of the thermoelectric generator 23. The plurality of thermoelectric generators 23 are connected in series or in parallel.

Reference numeral 26 is a hollow cylindrical cooling chamber to which the first radiator hose 14 and the second radiator hose 15 are connected and in which cooling water flows. The second electrode 25 of the thermoelectric generator 23 abuts on the inner wall 27 of the cooling chamber 26.

Next, the operation of the above configuration will be described. The catalyst 21 is heated to a high temperature by the exhaust gas. Then, one surface of the thermoelectric generator 23, which is in contact with the outer wall 22 of the catalyst 21 via the first electrode 24, is also heated.

On the other hand, since the cooling water constantly flows in the cooling chamber 26, it is kept at about 80 ° C. Then, the other surface of the thermoelectric generator 23, which is in contact with the inner wall 27 of the cooling chamber 26 via the second electrode 25, is cooled, and a temperature gradient is generated between the two surfaces of the thermoelectric generator 23. Electricity is generated.

According to the above-mentioned configuration, in the catalyst 21, the fluid resistance of the exhaust gas becomes large, heat is accumulated in the catalyst 21, and the reaction heat at the time of purification is also added, so that the catalyst 21 has higher heat than that of the exhaust pipe 11 only. Has become.

On the other hand, the cooling chamber 26 is kept at about 80 ° C. because the cooling water is constantly supplied from the radiator 12. Therefore, the temperature difference between the two surfaces of the heat-generating element 23 is much larger than that of the conventional configuration, and high power generation performance can be obtained.

Further, the exhaust gas temperature largely varies depending on the running state, but by incorporating the catalyst 21 inside, the temperature change is alleviated, and more stable power generation can be obtained, and further space saving is achieved. Can be achieved.

[0017]

[Effect of device]

 As described above, according to the present invention, it is possible to realize a space-saving exhaust heat power generation device having good power generation performance.

[Brief description of drawings]

FIG. 1 is a cross-sectional structure illustrating an embodiment of an exhaust heat power generation device of the present invention.

FIG. 2 is a view for explaining how to mount the exhaust heat power generation device shown in FIG.

FIG. 3 is a diagram illustrating a conventional exhaust gas thermoelectric generator.

[Explanation of symbols]

 10 Engine 11 Exhaust Pipe 21 Catalyst 22 Outer Wall 23 Thermoelectric Generator 26 Cooling Chamber

Claims (1)

[Scope of utility model registration request] 1. A catalyst (21) provided in an exhaust pipe line (11) of an engine (10) and a thermoelectric generator attached to an outer wall (22) of the catalyst (21) so that one surface side is in contact with the catalyst (21). An exhaust gas comprising an element (23) and a cooling chamber (26) which is in contact with the other surface side of the thermoelectric generation element (23) and through which cooling water of the engine (10) flows. Thermoelectric generator.