JPS59217496A - Heat exchanger - Google Patents

Abstract

PURPOSE:To reduce noise remarkably by a method wherein a space in a water jacket is divided by arranging partitioning plates in the axial direction of a heat transfer tube and the partitioning plate is provided with a plurality of through holes to supply waste gas into the space. CONSTITUTION:The space in the water jacket 4 provided with a plurality of heat transfer tubes 6 is divided by arranging the partitioning plates 7-10 in the axial direction of the heat transfer tube 6 and the partitioning plates 7, 10 are provided with small holes at randam while the spaces 21, 17 at both ends are provided with a waste gas introducing port 22 and a waste gas discharging port 23. According to this method, the waste gas, introduced from an engine into the waste gas introducing port 22, is expanded suddenly in the first space 21, further, is contracted suddenly by the small holes and is expanded suddenly in the next space, therefore, the sound attenuating effect of an expansion type may be developed and noise may be reduced remarkably.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a heat exchanger used in a device for recovering heat from exhaust gas from an engine or the like.

Conventional configuration and its problems With the recent trend towards energy conservation, a system as shown in Figure 1 has been devised and is in operation, which aims to improve the total energy efficiency by recovering heat from exhaust gas from heat sources such as engines. There are 17. This system extracts the shaft output from the dx engine as power, recovers waste heat in a heat exchanger 1, and discharges it through a muffler 2. Conventionally, in such a system, the heat exchanger 1 that recovers exhaust heat from the engine 3 and the muffler 2 are provided separately, which makes the system complicated and the sound transmitted from the muffler body is large. However, this method has drawbacks such as the need to increase the mass of the muffler.

Furthermore, conventional heat exchangers for waste heat recovery are often of the so-called fin type or plate type as shown in Figures 2 and 3, but the flow from the engine is a pulsating flow, and these The structure is not designed to take full advantage of this pulsating flow effect.

In addition, increasing the efficiency of heat recovery from exhaust gas condenses the exhaust gas and accelerates corrosion on the fin and plate surfaces. However, this method has disadvantages such as condensed water depositing in the plate space and promoting corrosion. In addition, in the plate type, the combustion exhaust gas flow rapidly contracts and expands in the plate space, and although a slight sound reduction effect is expected, the effect (scent) is small because the ratio of sudden contraction and expansion is small.

Purpose of the Invention In view of the above drawbacks, the present invention integrates a muffler and a heat exchanger to simplify the system configuration, improves replacement performance, has excellent sound reduction performance, and provides a heat exchanger, To provide a heat exchanger that is easy to scale up as a muffler.Structure of the InventionThe present invention surrounds a water jacket on the outside, arranges heat transfer tubes in the inner space, and fixes the space to the heat transfer tubes. It is divided into a plurality of spaces by a partition plate with small holes, and the combustion exhaust gas is configured to pass through the spaces. Hole 1o81□0. 0 Description of Embodiments Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 4 is a diagram showing a heat exchanger according to an embodiment of the present invention.

4 is a water jacket, and a plurality of heat exchanger tubes 6 and partition plates 7 to 10 are arranged in a space 5 of the water jacket 4.
is inserted firmly with the heat exchanger tube 6. A header 11 and a header 12 are provided at both ends of the heat exchanger tube 60,
The header 12 is provided with a water discharge pipe 13, and the header 11
is communicated with the water jacket by a water hole 14,
Further, the water jacket 4 is provided with a water introduction pipe 15. Small holes 16 are randomly drilled in the partition plates 7 and 1o, and spaces 17 to 21 are divided by each partition plate.
is provided. An exhaust gas inlet 22 and an exhaust gas outlet 23 are provided in spaces 21.17 at both ends.

The small holes provided in each partition plate and the space formed by the partition plate are determined taking into account the sound reduction characteristics of the expansion type, and as shown in the figure, for example, one stage of a resonance type muffler 19 is installed. It's okay.

Next, its operation will be explained. First, the fluid to be heated passes through the water jacket 4 from the water introduction pipe 15, enters the header ~ 11 from the water hole 4, branches into each heat transfer pipe 6, flows, enters the header 1'2, and is discharged from the water discharge pipe 13. be done.

On the other hand, exhaust gas from a heat source such as an engine, which is a heating fluid, enters the space 21 through the exhaust gas inlet 22 and enters the next space 20 through the small hole in the partition plate 10. In this embodiment, the next resonance type muffler 19 is It passes through, enters the next space 18, and then passes through the small hole in the partition plate and enters the next space 17, leading to the exhaust gas outlet 2.
3, and while the exhaust gas is flowing, heat is exchanged on the inner surface of the water jacket 4 and the surface of the heat exchanger tube 6.

According to this embodiment as shown in J above, the exhaust gas led from the engine to the exhaust gas inlet 22 rapidly expands in the first space 21, and then rapidly contracts in the small hole 16 before entering the next space 2o. , it also exhibits a so-called expansion type sound damping effect that rapidly expands in the next space, and also a resonance type muffler 1.
9, noise from the engine etc. is significantly reduced due to the resonance type silencing effect. Furthermore, since the exhaust gas space is surrounded by a large water jacket 4 on the outside, transmitted sound can be reduced.

Also, creating multiple spaces like this can be done by simply fixing partition plates to the heat exchanger tubes at appropriate distances.
The diameter of the small hole in the partition plate and the hole device may be simply made according to the sound reduction characteristics. In addition, when used in engines with different displacements and heat outputs, it is possible to easily scale up by changing the length or changing the space size without changing the diameter, and it is also possible to increase or decrease the heat transfer area. .

FIG. 6 shows a second embodiment of the present invention, in which the small holes 26 formed in the partition plate 24 are concentrated on about half of the surface as shown in FIGS. Roughly 1
Arrange the partition plates so that the direction can be changed by 80 degrees. That is, small holes are provided in the semicircles of the partition plates, and the semicircular parts with the small holes are arranged in opposite directions between adjacent partition plates. In this way, the combustion gas always crosses the heat exchanger tube 26, and the heat transfer surface of the heat exchanger tube can be used effectively, and the effect of the engine's pulsating flow is further increased, and the inner surface of the water jacket is The heat transfer rate due to collision increases. Furthermore, in the embodiments shown in FIGS. 1 and 6, the combustion gas and water are of a counter-flow type to improve temperature efficiency.

When heat is recovered from exhaust gas from an engine, etc., condensed water is generated, which can corrode the surface of the heat exchanger.In this example, by standing the heat exchanger vertically, the generated condensed water is released through the small holes. It is also possible to collect it by dropping it. As in the case shown in Figure 6, if the small holes are open only in a part of the partition plate, the heat exchanger should be stood vertically and the partition plate should be placed in the part where the small holes are open. If the heat exchanger is tilted so that
The heat exchanger can be made with a simple configuration, can be easily adapted to the noise characteristics of the sound source, and can also be easily adapted to scale up the heat source. In addition, heat transfer performance is improved by making full use of the pulsation of the engine, and corrosion can be suppressed by preventing condensed water from accumulating in the heat exchanger.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of an engine system equipped with an exhaust heat recovery heat exchanger, Figure 2 is a sectional view of a conventional fin type heat exchanger, and Figure 3 is a sectional view of a conventional plate type heat exchanger. , FIG. 4 is a sectional view of a heat exchanger according to an embodiment of the present invention, and FIG.
The figure is a sectional view taken along the line A-A' of FIG. 4, FIG. 6 is a sectional view of a different embodiment of the present invention, FIG. FIG. 2 is a sectional view taken along line CC' in FIG. 1; 4... Water jacket, 6... Heat exchanger tube, 8... Partition plate, 11, 12... Header, 17-21... Space, 16...・Small hole. Name of agent: Patent attorney Uneo Nakao and 1 other person No. 1
Figure 4 Figure-5

Claims (1)

[Claims] (1) The space of a water jacket provided with a plurality of heat transfer tubes through which the fluid to be heated passes is divided by placing a plurality of partition plates in the axial direction of the heat transfer tubes, and a plurality of through holes are provided in the partition plates. , A heat exchanger characterized in that exhaust gas is supplied to the space. )) The through hole of the partition plate is on the 1/2 side of the partition plate.