JPH0141884Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a structure in which a heat exchanger is supported by an exhaust manifold in a device for recovering engine exhaust heat using a heat exchanger.

<Prior Art> The exhaust heat recovery device described above is often incorporated into an engine-driven heat pump device, and a conventional example is shown in FIG. 7.

That is, the exhaust connected to engine 2
Inside the manifold 16, there is an exhaust flow path 18 that collects and flows the exhaust gas from the exhaust port 17 group, and a heat medium fluid flow that causes the heat medium fluid supplied from the heat medium fluid inlet 20 to flow around the exhaust flow path 18. An auxiliary heat exchanger 12 forming a passage 19 and using engine exhaust as a heat source.
This exhaust manifold 16
The heat transfer fluid and exhaust gas derived from
Heat exchanger 13 placed on the side of manifold 16
The heat medium fluid is supplied to the heat medium fluid inlet 28 and exhaust gas inlet 29 of the heat exchanger 13 through connection pipes 34 and 35, respectively, for further heat exchange. At the same time, the exhaust gas after heat exchange is guided to a muffler 14 connected to the lower part of the heat exchanger 13.

The heat exchanger 13 is disposed laterally with respect to the exhaust manifold 16 and is supported by a heat medium fluid supply connection pipe 36, an exhaust gas supply connection pipe 37, and a connecting member 38. Muffler 14 was fixed to the bottom of 13.

<Problem that the idea aims to solve> The above conventional example has the following problems.

B. Since the heat exchanger 13 is far away from the center of vibration of the engine 2, it vibrates greatly and generates a large vibration force. This large vibration force tends to cause fatigue damage to the connecting pipes 36, 37 and the connecting member 38.

(b) In order to sufficiently withstand the large vibration force of the heat exchanger 13, the support structure of the heat exchanger 13 is complicated, and
Becomes large.

C. Since the heat exchanger 13 protrudes widely outward from the side of the exhaust manifold 16, the external size of the engine becomes large.

D. When the muffler 14 is fixed to the lower part of the heat exchanger 13, the vibration force of the muffler 14 is added to the vibration force of the heat exchanger 13, making the connecting pipes 36, 37 and the connecting member 38 more likely to be damaged.

The present invention enables the heat exchanger to be firmly supported in the exhaust manifold with a simple structure, reduces the external size of the engine, and makes it possible to easily drain the condensed water generated inside the heat exchanger. purpose.

<Means for Solving the Problems> In order to achieve the above object, the present invention provides an exhaust communication passage 23 in the exhaust manifold 16, as shown in FIGS. The outlet 22 of the exhaust passage 18 and the inlet 42 of the exhaust communication passage 23 are opened far apart from each other on the upper surface, the heat exchanger 13 is mounted on the exhaust manifold 16, and the exhaust flow passage 18 in the exhaust manifold 16 is opened. exit 2
2, the inlet 29 of the exhaust passage 41 of the heat exchanger 13
The outlet 30 of the exhaust passage 41 of the heat exchanger 13 is connected to the inlet 42 of the exhaust communication passage 23 and fixed with fixtures 44 and 45, and the muffler 14 is connected to the outlet 46 of the exhaust communication passage 23. It is characterized by:

<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.

A first heat exchange device 9 uses engine cooling water as a heat source to heat the heat medium fluid, 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,
The heat exchanger 12 is supplied with exhaust gas that has passed through the exhaust manifold section, and the exhaust gas that exits the second heat exchanger 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 connects to the exhaust manifold 16.
The inlet 29 of the exhaust passage 41 provided at the lower part of one end of the heat dissipation core 26 is provided at the outlet 22 of the exhaust passage 18 of the manifold 16, and further provided at the lower part of the other end of the heat dissipation core 26. The outlet ports 30 of the exhaust passages 41 communicate with the inlets 42 of the exhaust communication passages 23 on the upper surface of the manifold 16, and are fixed with bolts and nuts 43, 44, and 45, respectively.
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.

<Another embodiment> (1) As shown in FIG. A bypass channel 35 with an adjustable valve 34 can also be implemented.

In this case, a device may be further provided to control the opening and closing of the valve 34 based on the temperature of the exhaust gas on the secondary side of the heat exchanger 13 or the pressure drop of the exhaust gas passing through the heat exchanger 13. Conceivable.

According to this configuration, the amount of exhaust gas used for heat exchange can be adjusted by adjusting the opening degree of the valve 34, and the generation of condensed water in each heat exchange section can be adjusted. Even when the heat dissipation core 26 is clogged with carbon in the exhaust gas and the exhaust gas flow resistance becomes extremely large, the exhaust gas flow is enabled by opening the valve 34, and engine operation can be continued.

(2) The muffler 4 does not necessarily need to be directly connected to the exhaust manifold 16; in some cases, the muffler 1 may be installed at the exit of the passage 23 and at a suitable location.
4 may be connected by piping.

<Effects of the invention> Since the invention is configured as described above, the invention has the following effects.

B. Since the heat exchanger is mounted on the exhaust manifold and directly fixed with fixings and strongly supported, this fixed support structure sufficiently suppresses the large vibration force of the heat exchanger and prevents fatigue damage. It can be firmly fixed and supported without raising it.

(b) Moreover, since the intermediate support is omitted from between the exhaust manifold and the heat exchanger, the support structure thereof is simplified.

C. Since the heat exchanger no longer protrudes outward from the side of the exhaust manifold, the external size of the engine becomes smaller.

Since the muffler is connected to the exhaust manifold, the vibrating force of the muffler is not applied to the heat exchanger.

(e) When strong acidic condensed water is generated in the exhaust passage of the heat exchanger, the condensed water flows smoothly into the exhaust communication passage from the outlet that opens downward at the bottom of the heat exchanger. This will prevent the heat exchanger from corroding.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view showing an engine exhaust heat exchange device according to the present invention, and Fig. 2 is a -
3 is a partially cutaway side view, FIG. 4 is a front view showing the overall appearance, FIG. 5 is a flowchart of an engine-driven heat pump device incorporating the device of the present invention, and FIG. FIG. 7 is a partially cutaway front view of another embodiment, and FIG. 7 is a partially cutaway side view of the conventional example. 2...Engine, 13...Heat exchanger, 16...
Exhaust manifold, 18...exhaust passage, 22...outlet, 23...exhaust communication passage, 29...
...Inlet, 30...Outlet, 41...Exhaust passage,
42... Entrance, 44/45... Fixture, 46...
Exit.

Claims (1)

[Scope of utility model registration request] Engine 2 exhaust manifold 16
The exhaust passage 41 of the heat exchanger 13 is connected to the exhaust passage 18 inside.
In this device, the exhaust manifold 16 is connected to the muffler 14 through the exhaust manifold 16, and the exhaust manifold 16 has an exhaust communication path 23.
The outlet 22 of the exhaust passage 18 and the inlet 42 of the exhaust communication passage 23 are opened far away from each other on the upper surface of the exhaust manifold 16, and the heat exchanger 13 is placed on the exhaust manifold 16. The exhaust passage 4 of the heat exchanger 13 is connected to the outlet 22 of the exhaust passage 18 in the manifold 16.
The inlet 29 of the heat exchanger 13 is connected to the inlet 42 of the exhaust communication passage 23 and the outlet 30 of the exhaust passage 41 of the heat exchanger 13 is fixed with fixtures 44 and 45, and the outlet 46 of the exhaust communication passage 23 is connected to the muffler An engine exhaust heat recovery device characterized by having 14 in communication with each other.