JPH0220631Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Field of Application> This invention relates to an engine exhaust heat exchange device that uses engine exhaust as a heat source to heat a heat transfer fluid (mainly water) for use in various applications.

<Prior art> As shown in FIGS. 6 and 7, the above-mentioned exhaust heat exchange device has conventionally been constructed by stacking a large number of flat oblong core units each having a hollow interior at appropriate vertical intervals. At the same time, a heat dissipating core 26 configured by connecting each core unit to each other via communication parts 26a and 26b is connected to the casing 2 at both ends thereof.
5, one communication part 26 of the heat dissipation core 26
The heating medium fluid introduced from the heating medium fluid inlet 34 provided at one end of the casing 25 is configured to introduce the exhaust gas from the exhaust manifold 15 into the exhaust manifold 15 and lead out the exhaust gas from the other communicating portion 26b. Channel 24 formed around heat dissipation core 26
There is a configuration in which the heat medium fluid is taken out through the heat medium fluid outlet 31 provided at the other end of the casing.

<Problems to be solved by the invention> In the above conventional configuration, the heating medium fluid inlet 34
The heat transfer fluid flow A introduced into the casing 25 from
was designed to be supplied toward the end of the heat dissipation core 26 on the exhaust inlet side, so that the heat dissipation core 26
It was difficult for the heat transfer fluid to flow around the back of the communication section 26a on the exhaust inlet side, and the section C in FIG. 7 tended to be more overheated than other sections, resulting in a decrease in heat exchange efficiency.

In addition, on the other hand, by deviating the heating medium fluid inlet 28' as shown by the imaginary line in FIG. 7, overheating in the C section can be eliminated.
The flow of the heat transfer fluid in the outer portion of the tube 6a tends to be insufficient.

The present invention aims to suppress local overheating of the heat dissipation core and improve heat exchange efficiency by improving the means for inflowing heat medium fluid into the casing.

<Means for Solving the Problems> In order to achieve the above object, in the present invention, as shown in FIG. A heating medium fluid inlet 28 that supplies the heat medium fluid toward the end of the heat dissipation core 26 on the exhaust inlet 29 side, and a heating medium fluid flowing in approximately the same direction as the heat medium fluid flow introduced from the heat medium fluid inlet 28. Another heating medium fluid inlet 32 is provided to be introduced into the casing 25, and the heating medium fluid from this other heating medium fluid inlet 32 is transferred to the heat dissipating core 26.
The casing 25 is provided with a shroud 33 for guiding the exhaust gas to the back of the communication portion 26a on the side of the exhaust inlet 29.

<Function> According to the above configuration, one heat medium fluid inlet 28
The heating medium fluid flow A introduced from the heating medium fluid flows along the outer end side of the communication part 26a on the exhaust inlet side, and the heating medium fluid flow B introduced from the other heating medium fluid inlet 32 flows along the outer end side of the communication part 26a on the exhaust inlet side. The heat transfer fluid flows around the back of the communication portion 26a under the guidance of the shroud 33 while flowing approximately parallel to the flow of the flow A without interfering with the flow of the flow A, and the heat transfer fluid flows sufficiently around the entire circumference of the communication portion 26a on the exhaust inlet side. Thus, the exhaust heat is uniformly removed from the heat dissipation core 26.

<Example> FIG. 5 shows the overall circuit configuration of an engine-driven heat pump device to which the engine exhaust heat exchange device according to the present invention is applied.

In the figure, 1 is a heat pump main body, which is composed of a compressor 3 driven by an engine 2, a condenser 4, an expansion valve 5, and an evaporator 6. 7 is a hot water heating device that obtains hot water for drinking purposes and other purposes, in which high-temperature heat medium fluid (hot water) heated by the heat generated by the heat pump body 1 and engine exhaust heat is circulated. A supplied heating heat exchanger 8 is installed inside.

Reference numeral 9 denotes a first heat exchange device that heats the heat medium fluid using engine cooling water as a heat source, and the engine cooling water is forcibly circulated by a pump 10.

Reference numeral 11 denotes a second heat exchange device that heats the heat transfer fluid using the engine exhaust as a heat source;
An auxiliary heat exchanger 12 using a manifold part,
It consists of a heat exchanger 12 to which the exhaust gas that has passed through the exhaust manifold section is supplied, and the exhaust gas exiting the second heat exchange device 11 is discharged to the outside air via a muffler 14.

The heat medium fluid circulating in the heat exchanger 8 of the hot water heating device 7 is pumped by the circulation pump 15 and is transferred to the heat pump main body 1, the first heat exchange device 9, and the second heat exchange device 11 as follows. Supply is fluid.

That is, the heat medium fluid (low temperature water) that has become low temperature through heat exchange (heat radiation) in the hot water heating device 7 is suctioned and pressurized by the circulation pump 15, and is first supplied to the condenser 4 of the heat pump main body 1. It is heated by the heat of condensation of the refrigerant. The heat medium fluid from the heat pump body 1 is distributed and supplied to the first heat exchange device 9 and the second heat exchange device 11, and further distributed to the auxiliary heat exchanger 12 and the heat exchanger 13 in the second heat exchange device 11. At the same time, the heat medium fluid from the auxiliary heat exchanger 12 is further supplied to the heat exchanger 13, and the high temperature heat medium fluid (high temperature water ) are combined and guided to the hot water heating device 7.

The present invention provides an exhaust heat exchange device, that is, the second
The heat exchange device has features, the details of which are shown in FIGS. 1 to 4.

In the figure, 16 is an exhaust manifold fixed to the side of the engine 2, and there are a plurality of exhaust ports 17 (three in the example) inside.
The auxiliary heat exchanger 12 is constructed by forming an exhaust flow path 18 that communicates with... and a heat medium fluid flow path 19 surrounding the outer periphery of the exhaust flow path 18 . A heat medium fluid inlet 20 is provided on the front surface of the exhaust manifold 16, and a heat medium fluid outlet 21 is provided on the left side of the top surface.
An outlet 22 of each exhaust flow path 18 is formed, and
An L-shaped exhaust communication passage 23 is formed extending from the upper surface of the manifold to the right end surface.

The above-mentioned main heat exchanger 13 is mounted and directly connected to the upper surface of the exhaust manifold 16.
The main heat exchanger 13 is composed of a casing 25 forming a heat medium fluid passage 24, a heat dissipation core 26 having an exhaust passage 41 therein, and a bottom plate 27. A heating medium fluid inlet 28 provided at the bottom of one end of the heating medium fluid passage 24 is connected to the exhaust manifold 1.
In addition, the inlet 29 of the exhaust passage 41 provided at the bottom of one end of the heat dissipation core 26 is connected to the outlet 22 of the exhaust flow path 18 of the manifold 16, and further to the bottom of the other end of the heat dissipation core 26. The outlet ports 30 of the provided exhaust passage 41 are communicated with the inlets 42 of the exhaust communication passage 23 on the upper surface of the manifold 16, and
It is fixed with each bolt and nut 43, 44, 45. The muffler 14 is connected to the other end of the exhaust manifold 16 so as to communicate with the outlet 46 of the exhaust communication passage 23. Further, a heat medium fluid outlet 31 is provided at the upper part of the other end of the casing 25 .

The heat dissipation core 26 is made by stacking a large number of flat oblong core units each having a hollow interior at appropriate intervals vertically, and at both ends thereof, each core unit is connected to a circular communicating portion 26a. ,26
b, and the exhaust inlet 29 is connected to the lower end of the communication portion 26a on one end side.
However, the exhaust outlet ports 30 are located at the lower end of the communication portion 26b on the other end side. The intermediate interior of each core unit is subdivided into a large number of parallel passages by inserted corrugated plates to increase the area of contact with the exhaust gas.

Furthermore, a heat medium fluid inlet 32 is provided at one end of the front portion of the casing 25 to directly supply heat medium fluid from the heat pump main body 1 . This inlet 32 is connected to the auxiliary heat exchanger 1 as shown in FIG.
2 through inlet 28.
is opened in a direction that does not prevent the fluid from flowing along the communication section 26a on the inlet side of the heat dissipation core 26, and the heat medium fluid flow B that directly flows in flows around the back of the communication section 26a on the inlet side. It is configured to be guided by a shroud 33 protruding from the front wall of the casing 25 so that it can flow sufficiently between the upper and lower core units.

<Effects of the invention> As explained above, according to the invention, the core unit communication section on the exhaust inlet side of the heat dissipation core containing the heat medium fluid through the two heat medium fluid inlets provided in the casing. It is possible to supply heat medium fluid uniformly over the entire circumference of the heat dissipating core, suppressing the occurrence of local overheating in the heat dissipating core, improving the durability of the core, and enabling highly efficient exhaust heat exchange. It can be carried out.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view of the engine exhaust heat exchange device according to the present invention, Fig. 2 is a sectional view taken along the line of Fig. 1, Fig. 3 is a partially cutaway side view, and Fig. 4 shows the overall appearance. 5 is a flowchart of an engine-driven heat pump device incorporating the device of the present invention, FIG. 6 is a partially vertical front view of a conventional example, and FIG. 7 is a sectional view taken along the line of FIG. 6. 15...Exhaust manifold, 24...
...Flow path, 25...Casing, 26...Radiation core, 26a, 26b...Communication section, 28, 32...
Heat medium fluid inlet, 33... Shroud, A... Heat medium fluid flow.

Claims (1)

[Scope of utility model registration request] A large number of flat core units each having a hollow interior are stacked at appropriate intervals, and each core unit is connected to a communicating portion 26 at both ends thereof.
A heat dissipation core 26 configured by being connected via a and 26b is installed inside the casing 25, and exhaust gas from the exhaust manifold 15 is introduced into one communication section 26a of the heat dissipation core 26, and the exhaust gas is introduced from the other communication section 26b. An engine exhaust heat exchanger configured to lead out exhaust gas, and configured to take out a heat medium fluid introduced from one end of the casing 25 from the other end of the casing 25 through a flow path 24 formed around a heat radiation core 26. In the apparatus, a heat medium fluid inlet 28 is provided at one end of the casing 25 to supply the introduced heat medium fluid toward the end of the heat dissipation core 26 on the exhaust inlet side; Another heating medium fluid inlet 32 is provided for introducing the heating medium fluid into the casing 25 in substantially the same direction as the heating medium fluid flow A, and this another heating medium fluid inlet 32 is provided.
A shroud 3 for guiding heat transfer fluid B from the heat dissipation core 26 to the back of the communication portion 26a on the exhaust inlet side.
3 is provided in a casing 25.