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Exhaust heat recovery device

A technology of exhaust heat recovery and heat recovery device, which is applied in the direction of exhaust device, muffler device, heat exchanger, etc., can solve the problems of cooling water temperature rise, cooling water boiling, abnormal sound of heat recovery device, etc., and achieves boiling suppression. Effect

Active Publication Date: 2020-02-28
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the above-mentioned exhaust heat recovery device, since the first flow path is heated by the exhaust gas flowing through the first flow path, the heat of the first flow path is transferred to the second flow path and the cooling water in the heat recovery device The temperature rises
In particular, since the circulation of the cooling water in the heat recovery unit is stopped, for example, when the engine is stopped, the cooling water will remain in the heat recovery unit, and there is a possibility that the cooling water in the heat recovery unit will boil.
In this case, it may cause abnormal sound caused by cooling water boiling in the heat recovery unit

Method used

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no. 1 approach

[0035] Below, use figure 1 and figure 2 The exhaust heat recovery device 10 according to the first embodiment will be described, and next, the heat transfer suppression mechanism 50 applied to the exhaust heat recovery device 10 will be described. In addition, hereinafter, the upstream side and the downstream side of the flow direction of the exhaust gas may be simply referred to as "upstream side" and "downstream side", respectively.

[0036] About Exhaust Heat Recovery Unit 10

[0037] like figure 2 As shown, the exhaust heat recovery device 10 recovers the heat of the exhaust gas of the engine 12 of the automobile by exchanging heat with the cooling water in the heat recovery device 40 described later, and uses it to promote the warming up of the engine 12. -up) and other devices.

[0038] like figure 1 As shown, the exhaust heat recovery device 10 has a tubular first pipe 20 . In the present embodiment, the first pipe 20 is formed into a tubular shape by joining me...

no. 2 approach

[0061] Below, use Figure 4 The exhaust heat recovery device 60 of the second embodiment will be described. The exhaust heat recovery device 60 of the second embodiment has the same configuration as the exhaust heat recovery device 10 of the first embodiment except for the heat transfer suppression mechanism 50 . Hereinafter, the heat transfer suppressing mechanism 50 of the exhaust heat recovery device 60 will be described. In addition, in Figure 4 In , the same reference numerals are attached to components configured in the same manner as those of the exhaust heat recovery device 10 of the first embodiment.

[0062] In the heat transfer suppression mechanism 50 of the exhaust heat recovery device 60, the heat insulating material 56, the bolt 52, and the weld nut 54 are omitted, and the second piping flange 32 of the second piping 30 is directly joined to the first piping 20 by laser welding. . In addition, in Figure 4 In the figure, for convenience of description, the...

no. 3 approach

[0066] Below, use Figure 5 The exhaust heat recovery device 70 of the third embodiment will be described. The exhaust heat recovery device 70 of the third embodiment has the same configuration as the exhaust heat recovery device 10 of the first embodiment except for the heat transfer suppression mechanism 50 . Hereinafter, the heat transfer suppression mechanism 50 of the exhaust heat recovery device 70 will be described. In addition, in Figure 5 In , the same reference numerals are attached to components configured in the same manner as those of the exhaust heat recovery device 10 of the first embodiment.

[0067] The heat insulating material 56 is omitted in the heat transfer suppressing mechanism 50 of the exhaust heat recovery device 70 . Furthermore, the heat transfer suppressing mechanism 50 of the exhaust heat recovery device 70 has a first piping flange 28 as a "first flange" formed on the first piping 20, and the first piping flanges 28 are respectively formed on...

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Abstract

The present invention provides an exhaust heat recovery device comprising: a first pipe that circulates exhaust gas from an engine; a second pipe that communicates with the first pipe and connects to the first pipe. a detour; a heat recovery device disposed inside the second pipe, and performing heat exchange between the cooling water circulating inside and the exhaust gas, thereby recovering the heat of the exhaust gas; a heat transfer suppression mechanism , which is provided at a connection portion where the first pipe and the second pipe are connected, and suppresses transfer of heat from the first pipe to the second pipe.

Description

technical field [0001] The invention relates to an exhaust heat recovery device. Background technique [0002] The exhaust heat recovery device described in Japanese Patent Application Laid-Open No. 2012-247132 is configured to include: a first flow path (first piping) through which exhaust gas from the engine flows; a second flow path (second piping) through which the exhaust gas from the The first flow channel is branched; a heat recovery device is arranged in the second flow channel. In addition, the heat recovery unit has discharge holes for allowing more cooling water to flow through the upstream side of the heat recovery unit than through the downstream side of the heat recovery unit. Accordingly, it is configured such that the cooling water in the heat recovery unit can flow in accordance with the temperature gradient of the cooling water. [0003] However, in the above-mentioned exhaust heat recovery device, since the first flow path is heated by the exhaust gas fl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60H1/03F01N5/02F01P7/16
CPCB60H1/03F01N5/02F01P7/16Y02T10/12F02G5/02F28D21/0003
Inventor 村田登志朗中川正松浦一成
Owner TOYOTA JIDOSHA KK
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