JPH0544497Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention relates to a heat recovery device that uses engine exhaust as a heat source to heat a heat medium liquid (mainly water) and use it for various purposes. Used in co-generation equipment, etc.

《Prior Art》 Conventionally, as a heat recovery device for heating a heat medium liquid using the heat held in engine exhaust gas and using it for various purposes, for example, the There is No. 62-39169.

This consists of stacking a large number of flat cores with hollow interiors to form a heat dissipation core, and a heat exchanger containing these heat dissipation cores is arranged in an exhaust manifold, and one end of the heat dissipation core is communicates with the exhaust outlet pipe of the exhaust manifold, and the other side of the heat dissipation core communicates with the muffler, so that heat is transferred between the heat medium liquid flowing in the heat exchanger and the exhaust gas flowing in the heat dissipation core. The structure is such that the heating medium liquid can be heated by exchanging it.

<Problem to be solved> Generally, exhaust gas contains carbon and oil, but in conventional exhaust heat recovery devices, the heat dissipation core is connected to the exhaust outlet pipe of the exhaust manifold, so carbon and other substances mixed in the exhaust gas can adhere to the inner surface of the gas passage in the heat dissipation core. When carbon and other substances adhere to the inner surface of the gas passage, the cross-sectional area of the gas passage is narrowed, and since carbon has low thermal conductivity, the heat exchange performance is reduced. In addition, when the gas passage of the heat dissipation core becomes clogged, the heat dissipation core must be replaced, but since the heat dissipation core is expensive, the maintenance costs are high and it is not economical.

The present invention has been made with attention to such points, and an object of the present invention is to eliminate the adhesion of carbon and the like inside the heat dissipation core.

<Means for Solving the Problems> In order to achieve the above-mentioned object, the present invention connects a heat dissipation core to an exhaust outlet pipe communicating with the combustion chamber of the engine to form an exhaust outlet pipe. The engine exhaust heat recovery device is characterized in that a replaceable filter material is installed inside the exhaust gas inflow port from the exhaust outlet pipe to the heat dissipation core.

[Operation] In this invention, a replaceable filter material is installed inside the exhaust gas inlet from the exhaust outlet pipe to the heat dissipation core, so carbon and oil mixed in the exhaust gas are captured by the filter material. This prevents the heat from flowing into the heat dissipation core portion. This results in
The accumulation of carbon etc. on the heat dissipation core part is eliminated,
Heat exchange between the exhaust gas and the heat transfer liquid can be performed efficiently over a long period of time.

<<Example>> FIG. 1 is a central longitudinal cross-sectional view showing one embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line of FIG. 1.

In the figure, 1 is an exhaust heat recovery device, and this exhaust heat recovery device 1 is connected to an exhaust manifold block 2.
and a heat exchanger 3 disposed directly above the exhaust manifold block 2.

The exhaust manifold block 2 has an exhaust manifold 6 that communicates with each exhaust port 5 of the engine body, and a heat medium liquid passage 7 formed to surround the outer circumference of the exhaust manifold 6. It functions as an auxiliary heat exchanger that exchanges heat between the exhaust gas flowing in the manifold 6 and the heat medium liquid flowing in the heat medium liquid flow path 7.

The heat exchanger 3 includes a casing 9 forming a heat medium liquid passage 8 and a heat radiation core 11 having an exhaust gas passage 10 therein. This heat dissipation core 11
In this method, a large number of flat oblong core units each having a hollow interior are stacked vertically at appropriate intervals, and both ends of each core unit are connected to each other by a circular communication portion 12, and the communication portion 12a on one end side is connected to each other by a circular communication portion 12. It communicates with the exhaust outlet pipe 13 of the exhaust manifold block 2 to serve as an inflow pipe, and the communication part 12b on the other end side is connected to the muffler 14.
The exhaust outlet pipe 15 of the exhaust manifold block 2 communicates with the exhaust outlet pipe 15 of the exhaust manifold block 2, and is configured as an outflow pipe. Therefore, the exhaust gas discharged from the combustion chamber of the engine is transferred to the manifold 6 and the exhaust outlet pipe 1.
3. It flows into the muffler 14 through the heat dissipation core 11 and the exhaust gas take-off pipe 15, and these constitute the exhaust gas lead-out pipe 16.

Heat medium liquid flow path 7 in exhaust manifold block 2
and the heat medium liquid passage 8 in the heat exchanger 3 are communicated through a communication port 18 opened in the upper wall 17 of the exhaust manifold block 2, and this communication port 18 is located on the engine body side of the exhaust manifold block 2. , are formed near the exhaust outlet pipe 13 of the exhaust manifold 6. Also, the casing 9 of the heat exchanger 3
A heat transfer fluid outlet portion 19 is formed in the side wall portion on the side opposite to the engine body. This heat medium liquid outlet part 19
In addition to opening two outlet ports 20 and 21, a thermostat valve 22 is disposed, and the operation of the thermostat valve 22 selectively connects the outlet ports 20 and 21 to the heat medium liquid passage 8 in the casing 9. It is designed to communicate with the Further, a heating medium liquid inlet 2 is provided at one end of the upper wall 17 of the exhaust manifold block 2.
3 is provided. As a result, the heat medium liquid inlet 23
The heat medium liquid flowing into the heat medium liquid flow path 7 in the exhaust manifold block 2 exchanges heat with the exhaust gas flowing in the exhaust manifold 6, and then flows through the communication port 18.
Flows into the heat exchanger 3 from the heat exchanger 3, exchanges heat with the exhaust gas flowing in the heat radiation core 11 while flowing through the heat medium liquid passage 8 in the heat exchanger 3, and passes through either of the heat medium liquid outlet ports 20, 21. The heat medium liquid flow path 7 in the manifold block 2 and the heat medium liquid path 8 in the heat exchanger 3 constitute a heat medium liquid path 24. In the heat exchanger 3, the heat medium liquid flows in a state perpendicular to the flow direction of the exhaust gas.

A filter material 26 made of a porous material such as Celmet is placed at the connection between the exhaust outlet pipe 13 of the exhaust manifold 6 and the inlet 25 to the core portion of the heat dissipation core 11 to prevent it from getting mixed into the exhaust gas. Filter material 2 removes the carbon and oil that flow out.
6 to prevent these carbons and the like from flowing into the core portion of the heat dissipation core 11. The filter material 26 is configured to be replaceable from the upper wall 27 of the casing 3 of the heat exchanger 3.

Further, a detection end 30 of a pressure sensor 29 faces the collecting pipe 28 portion of the exhaust manifold 6, and when the filter material 26 becomes clogged, the pressure sensor 29 indicates an abnormality.

FIG. 3 is an exploded view of the main parts showing another embodiment of the present invention. In this embodiment, a filter material 26 is attached to the connection part between the exhaust outlet pipe 13 of the exhaust manifold 6 and the exhaust inflow pipe 12a of the heat dissipation core 11. The other configurations are the same as the previous example.

[Effects] In this invention, a replaceable filter material is installed inside the exhaust gas inlet from the exhaust outlet pipe to the heat dissipation core, so carbon and oil mixed in the exhaust gas are captured by the filter material. This prevents carbon from flowing into the heat dissipation core and prevents carbon etc. from accumulating inside the heat dissipation core.
Heat exchange between the exhaust gas and the heat medium liquid in the heat dissipation core portion can be performed efficiently over a long period of time.

In addition, even if the filter material becomes clogged and the heat exchange efficiency decreases, the heat exchanger will recover the specified heat exchange efficiency by simply replacing the filter material.
In addition to extending the durability of the heat exchanger, since the filter material must be replaced, maintenance costs are low and economical.

[Brief explanation of the drawing]

FIG. 1 is a central vertical cross-sectional view showing one embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line taken from FIG. 1, and FIG. 3 is an exploded view of main parts of another embodiment. 11... Heat dissipation core, 14... Muffler, 16...
Exhaust outlet pipe, 24... Heat medium liquid flow path, 25...
11 exhaust gas inlet, 26...filter material.

Claims (1)

[Claims for Utility Model Registration] A heat medium liquid flow path 24 is formed in the middle of an exhaust flow path that communicates the engine body of the engine with the muffler 14 in a state surrounding the exhaust gas flow path 16, and this heat medium liquid flow path 24 A part of the exhaust outlet pipe 16 located inside is constituted by the heat radiation core 11, and the heat medium liquid flow path 24
In an engine exhaust heat recovery device configured to recover the heat retained in the exhaust gas flowing inside the exhaust outlet pipe 16 using a heat medium liquid flowing therein, the exhaust gas inlet of the exhaust outlet pipe 16 to the heat radiation core 11 Filter material 2 is closer to the engine body than 25.
An engine exhaust heat recovery device characterized by having a replaceable interior.