JPS59225294A - Heat exchanger - Google Patents

Abstract

PURPOSE:To obtain a heat exchanger which is surpassing in heat exchanging performance and muffling performance and is easy to be scaled up, as well as to simplify the system constitution of a muffler and a heat exchanger, by surrounding the outside of a heat exchanger with a water jacket, by protruding part of partition plate, which partitions the inside space of a heat exchanger into a plural number, to the flowing direction of fluid which flows through the inside space of a heat exchanger, and by providing a plurality of pores to the protruded part. CONSTITUTION:A plurality of heat transfer tubes 6 and partition plates 7, 8 and 9 are provided in the space 5 inside a water jacket 4, and a water outlet port 11 is provided to a header 10. A header 12 is communicated with the jacket 4 by a water hole 13, and a water conduit 14 is provided to the jacket 4. A protruded part 15 is provided to one of parts of partition plates 7, 8 and 9, at least, in the same direction as of an exhaust gas flow as shown by dashed lines, and a plurality of small holes 16 are punched on the protruded part 15. The small holes 16 are punched on the circumference of a protruded part 15, which is constituted so that the exhaust gas flow 17 being injected from small holes 16 collides against the inner surface of a water jacket. By such an arrangement, heat is exchanged on the inner surface of a jacket and the surface of heat transfer tubes while the exhaust gas is flowing through the space 5.

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 configurations and their problems With the recent trend toward energy conservation, a system like the one shown in Figure 1 has been considered, which attempts to improve total energy efficiency by recovering heat from exhaust gas from heat sources such as engines. It is in operation. This system extracts the shaft output from the engine as power, recovers exhaust heat with a heat exchanger 1, and discharges it through a muffler 2. Conventionally, in such a system, the heat exchanger 1 and the muffler 2, which recover exhaust heat from the engine 3, are provided separately, which makes the system complicated and also causes noise transmission from the muffler body. It is large, and therefore has the disadvantage that the mass of the muffler must be increased.

In addition, conventional heat exchangers 2 for exhaust 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. , these types do not have a structure that can fully utilize the effect of this pulsating flow. 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, it rapidly decreases.

The effect is small because the rate of rapid expansion is small.

Purpose of the Invention In view of the above-mentioned drawbacks, the present invention integrates a silencer and a heat exchanger to simplify the system configuration, improves heat exchange performance, and provides a heat exchanger and a silencer that have excellent silencing performance. This provides a heat exchanger that is easy to scale up.

Structure of the Invention The present invention surrounds the outside with a water jack containing a fluid to be heated, and is provided with a partition plate that divides the internal space into a plurality of parts, and the partition plate divides at least a portion of it in the flow direction of the fluid flowing through the internal space. A plurality of small holes are provided in the projecting portion, and a heat transfer tube through which the fluid to be heated passes is provided in the internal space.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 4 is a diagram showing a heat exchanger according to an embodiment of the present invention. 24 is a water jacket, and the inner space 6 of the water jacket 4 has a plurality of heat transfer tubes 6 and a partition plate 7.
. It is being At least a part of the partition plates 7, 8.9 is provided with a protrusion 16 that protrudes in the same direction as the exhaust gas flow indicated by the broken line in the figure, and the protrusion 16 is provided with a plurality of small holes 16. It's dripping. In this embodiment, this small hole 16 is bored on the circumference of the protrusion 15, and spaces 18 and 19 at both ends are configured so that the exhaust gas flow 17 ejected from the small hole 16 collides with the inner surface of the water jacket. Exhaust gas inlet 20 and exhaust gas outlet 2
1 is provided.

Next, its operation will be explained. First, the fluid to be cal-heated is 14
Pass the water jacket 4 through the water inlet pipe, and the water hole 1.
The water enters the header 12 from 3, branches into each heat transfer tube 6, flows, enters the header 10, and is discharged from the water discharge pipe 11. On the other hand, exhaust gas from a heat source such as an engine, which is a heating fluid, enters the space 18 through the exhaust gas inlet 2o, is ejected in the circumferential direction from the small hole 16 of the protrusion 16 provided in the partition plate 7, and is further ejected from the next partition plate. The small hole 23 enters the protrusion 22 provided in the
During the flow of the exhaust gas, heat is exchanged on the inner surface of the water jacket and on the surface of the heat exchanger tube.

As described above, according to this embodiment, the exhaust gas led from the engine to the exhaust gas inlet 2o rapidly expands in the first space 18, rapidly contracts when entering the protrusion 16 of the partition plate 7, and further By repeatedly expanding in multiple spaces when ejected from 16 small holes 16 in the circumferential direction, it exhibits a so-called expansion-type noise reduction effect, and noise from engines etc. is greatly reduced. be done. Also, the outside of the exhaust gas space is covered with a water jacket 4 with a large mass.
Since it is surrounded by , it is possible to reduce transmitted sound. In addition, creating multiple spaces like this can be done simply by fixing partition plates to the heat exchanger tubes or the inner wall of the water jacket at an appropriate distance, or the size of the spaces can be adjusted arbitrarily depending on the noise characteristics of the heat source. It can be changed.

In this embodiment, the small hole provided in the protruding part is arranged to emit gas in the circumferential direction, but by doing so, the exhaust gas ejected from the small hole collides with the heat transfer tube or the inner wall of the water jacket, resulting in improved heat transfer performance. increases dramatically. In addition, when used in engines with different displacements and heat outputs, it is possible to scale up easily by leaving the overall diameter unchanged and changing the length and space size, and it is also possible to increase or decrease the heat transfer area. It is.

In this example, the protrusion provided on the partition plate is located at the center of the e-mail, and the tip of the protrusion is closed, but the protrusion is shifted from the center and alternated between adjacent partition plates. The heat transfer performance is also increased by providing a small hole at the tip of the protrusion so that the exhaust gas jet collides with the partition plate. Also, when heat is recovered from exhaust gas from an engine, etc., condensed water is generated and can corrode the surface of the heat exchanger, but by standing the heat exchanger vertically, the condensed water can be quickly dripped from small holes and recovered. It is possible to suppress corrosion.

Effects of the Invention In the heat exchanger of the present invention, since the heat exchanger with an integrated muffler is manufactured with a simple structure, it can be easily adapted to the noise characteristics of the sound source, increasing the sound reduction effect. Furthermore, it is easy to scale up the heat source. Furthermore, the heat transfer performance is improved by fully utilizing the pulsating effect of exhaust gas from the engine, etc.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of an engine system equipped with a conventional 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. 6 is a sectional view taken along line A-A' in FIG. 4...Water jacket, 6...
Inner space, 6... Heat exchanger tube, 7, 8.9...
...Partition plate, 10.12...Header, 11.
...Water discharge pipe, 15...Protrusion, 17.
...Exhaust gas flow, 21...Exhaust gas outlet. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 4 Figure 5

Claims (2)

[Claims] (1) A plurality of heat transfer tubes through which the fluid to be heated passes is provided in an internal space surrounded by a water jacket on the outside and through which the fluid to be heated passes, and at least a portion of the tubes is provided in an internal space through which the fluid to be heated passes. The interior space is divided into a plurality of parts by a partition plate having a protruding part and a plurality of small holes through which the heating fluid is ejected so as to collide with the heat transfer tube in the protruding part. Features of heat exchanger. (2) The heat exchanger according to claim 1, wherein the protruding portion is provided eccentrically from the center of the partition plate, and the positions of the protruding portion are different between adjacent partition plates.