JPS639086B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat exchanger for engine cooling water, and particularly to a heat exchanger suitable for cooling the cooling water of a marine diesel engine.

A schematic structure of a conventional marine diesel engine cooling water heat exchanger will be explained with reference to FIGS. 1 and 2. In the figure, a cylindrical heat exchange element 12 is disposed within a heat exchanger body 10, and a plurality of pipes 14 through which seawater, which is a secondary fluid, passes are disposed within this heat exchange element 12 in the axial direction of the element 12. ing. Further, within the heat exchanger main body 10, an exhaust pipe 16 is located below the element 12. The cooling water that cooled the engine (not shown) flows into the heat exchanger main body 10 from an inlet 20 provided in the air chamber 18 formed at the upper part of the heat exchanger main body 10. constitutes a reservoir. The cooling water in the heat exchanger body 10 enters the element 12 through a plurality of engine cooling water inlets 22 formed at the right end of the element 12 in the drawing. The cooling water that has entered the element 12 flows between the pipes 14 from right to left in the diagram, and flows from the plurality of engine cooling water outlets 24 formed at the left end of the element 12 to the heat exchanger body 10 in the diagram. It flows out into a small chamber 26 formed on the upper left side. Small room 26
The cooling water flowing into the chamber 26 is discharged through the outlet 2 which opens into the small chamber 26.
8 to the outside of the heat exchanger main body 10, and is sent to the engine again to function as engine cooling water. In the cooling water flow, the high temperature cooling water warmed by the engine is heat exchanged in a heat exchange element 12 equipped with a pipe 14 through which low temperature seawater flows, and after its temperature is lowered, it is sent to the outlet 28. become. Furthermore, the exhaust gas passing through the exhaust pipe 16 is also cooled by the cooling water stored in the heat exchanger body 10.

In the conventional engine cooling water heat exchanger configured as described above, the exhaust pipe 16 is located below the cooling water inlet 22 and outlet 28 of the heat exchanger main body 10. The cooling water was likely to stagnate, making it difficult to cool the exhaust pipe 16. Also,
Generally, when an engine is started, it is cold, and in such cases, it is preferable for the engine to warm up quickly in order to increase engine efficiency.
In the conventional heat exchanger, the engine cooling water is sent to the engine immediately after being cooled by the heat exchange element, so there is a problem in that the engine is difficult to warm up.

The present invention was made in view of the above-mentioned conventional engine heat exchanger situation, and the exhaust pipe is sufficiently cooled, and when the engine is started, warmed cooling water is supplied to the engine side, and the engine is heated. The purpose is to propose an engine heat exchanger that is easy to warm up. In order to achieve the above object, the present invention defines a first chamber and a remaining second chamber in a heat exchanger main body by a partition wall, and includes a plurality of pipes inside through which a low-temperature secondary fluid passes. A heat exchange element is arranged in the heat exchanger main body, one end of the heat exchange element penetrates the partition wall and is located in the first chamber, and the engine cooling water inlet of the heat exchange element opens to the first chamber, and the heat exchange element is arranged in the first chamber. Most of the element is located in the second chamber, and the engine cooling water outlet of the heat exchange element opens into the second chamber, and the exhaust pipe communicating with the engine combustion chamber is connected below the heat exchange element within the heat exchanger body. The engine cooling water heat exchanger is characterized in that the exhaust pipe is disposed in the second chamber, and the engine cooling water outlet communicating with the engine side is opened near the exhaust pipe of the heat exchanger body.

Preferred embodiments of the engine cooling water heat exchanger according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 3 shows a fishing boat equipped with a diesel engine 30 equipped with a heat exchanger 32 according to the present invention, and the heat exchanger 32 is attached to the upper part of the diesel engine 30. The exhaust gas discharged from the exhaust pipe in the heat exchanger 32 is transferred to the exhaust pipe 34,
It passes through the muffler 36 and is discharged to the outside.

FIG. 4 is a sectional view showing the structure of the heat exchanger according to the present invention, FIG. 5 is a sectional view taken along the upper line of FIG. 4, and FIG. 6 is an enlarged sectional view taken along the upper line of FIG. 4. , FIG. 7 is an enlarged cross-sectional view taken along the upper line in FIG. 4. The heat exchanger body 40 constitutes an engine cooling water reservoir, and the engine cooling water is supplied into the heat exchanger body 40 from a cooling water inlet 42 attached to the top surface of the heat exchanger body 40, as shown in FIG. is supplied to and stored. A heat exchange element 44 is disposed at an upper portion within the heat exchanger body 40 . A plurality of small diameter pipes 46 are arranged within the heat exchange element 44 along the axial direction of the heat exchange element 44 . Seawater as a low-temperature secondary fluid flows in this pipe 46 from right to left in the figure, and cools the engine cooling water in the heat exchange element 44. The right end of the heat exchange element 44 in FIG. Ru. Both ends of the heat exchange element 44 are connected to the pipe 4
It is closed except for the end face of 6. cap 48
A seawater inlet pipe 52 is formed in the cap 50, and a seawater outlet pipe 54 is formed in the cap 50. Therefore, seawater enters the chamber 56 in the cap 48 from the inlet pipe 52, then travels inside the pipe 46 of the element 44 from right to left in the drawing, exits to the chamber 58 in the cap 50, and then enters the seawater outlet pipe. 54.

As shown in FIGS. 4 and 5, the inside of the heat exchanger main body 40 is defined by a partition wall 60 into a relatively small first chamber 62 and a remaining large second chamber 63. Near the left end of the heat exchange element 44 is the partition wall 6
0 and is located in the first chamber 62. A plurality of engine coolant inlets 64 are formed near the left end of the heat exchange element 44 , and the engine coolant inlets 64 open into the first chamber 62 . Further, the first chamber 62 is provided with an engine cooling water inlet pipe 66, through which cooling water for cooling the engine is supplied. Most of the heat exchange element 44 is located in the second chamber 63, and a plurality of engine cooling water outlets 68 are formed near the right end of the heat exchange element.
It opens into chamber 63.

In the second chamber 63 within the heat exchanger main body 40 , an exhaust pipe 70 is located below the heat exchange element 44 and substantially parallel to the heat exchange element 44 .
The exhaust pipe 70 communicates with an engine combustion chamber 80 via a pipe 72 shown in FIGS. 6 and 7. 8
1 is an exhaust passage, and 82 is an exhaust valve. Exhaust gas from each engine combustion chamber 80 will therefore be collected into exhaust pipe 70 through pipe 72 . The exhaust pipe 70 is open at both ends, and can be used as an outlet on either the left or right side. That is, the exhaust pipe 70
When using the left side as the exhaust gas outlet, connect the exhaust pipe 34 to the left opening, and connect the right opening to the lid 7.
4 and vice versa. A hole designated by 75 connects the heat exchanger body 40 to the diesel engine 30.
A through bolt is inserted to attach it to the A cooling water outlet pipe 76 is provided within the heat exchanger body 40 below the exhaust pipe 70, that is, on the lower surface of the heat exchanger body 40. The cooling water outlet pipe 76 is connected to a pump 78 which sends the cooling water to a cooling water jacket (not shown) of the diesel engine 30 to cool the diesel engine 30, and then to the cooling water inlet pipe 66 to cool the diesel engine 30. It is designed to send water. Note that this pump 78 is linked with the engine rotation section, and the discharge amount increases as the engine rotation speed increases.

The operation of the embodiment according to the present invention constructed as described above is as follows. First, pump 7 for cooling water.
8 to the cooling water inlet pipe 66 , and from this inlet pipe 66 to the first chamber 62 , through the inlet 64 and into the heat exchange element 44 . The cooling water warmed by the engine 30 is heat exchanged and cooled within this heat exchange element 44, and after cooling, the cooling water enters the second chamber 63 from an outlet 68 opened near the right end of the heat exchange element 44. leaks to. Outlet 6
The cooling water flowing out from the exhaust pipe 70 flows downward as shown by the arrow in FIG.
The coolant is cooled and sent from the coolant outlet pipe 76 to the coolant jacket of the diesel engine 30 again to cool the engine and used for circulation.

According to the embodiment, the cooling water coming out of the outlet 68 of the heat exchange element 44 cools the exhaust pipe 70 and is discharged from the outlet pipe 76.
Cooling water does not stagnate around the exhaust pipe 7.
0, cooling is ensured.

Also, the cooling water that has passed near the exhaust pipe is sent to the engine's cooling water jacket, but since the exhaust pipe warms up relatively quickly after the engine starts, the engine's cooling water jacket is not warmed even at the time of starting. Cooling water will be sent. Therefore, even if the engine is cold when the engine is started, there is an advantage that the engine can be warmed up in a short time by the cooling water heated by the exhaust pipe. In this way, the engine is warmed by the cooling water only at the time of startup when the engine speed is low and the amount of pump 78 discharged is small, and the amount of cooling water per unit time is small. increases, the amount of cooling water per unit time increases, and even if the temperature of the exhaust pipe increases, the temperature of the cooling water does not rise much, making it possible to cool the engine.

As explained above, according to the engine cooling water heat exchanger according to the present invention, the cooling water is sequentially sent to the engine side through the vicinity of the exhaust pipe in the heat exchanger, so the cooling water accumulates around the exhaust pipe. To surely cool an exhaust pipe without flushing. Further, when starting a cold engine, there is an effect that the engine can be quickly warmed up by the cooling water heated by the exhaust pipe.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view showing the schematic structure of a conventional engine cooling water heat exchanger, Figure 2 is a cross-sectional view along the top line of Figure 1, and Figure 3 is a cross-sectional view showing the structure of a conventional engine cooling water heat exchanger. 4 is a sectional view showing an embodiment of the present invention; FIG. 4 is a sectional view of an embodiment of the present invention;
The figure is a sectional view taken along the upper line of Figure 4, Figure 6 is an enlarged sectional view taken along the upper line of Figure 4, and Figure 7 is an enlarged sectional view taken along the upper line of Figure 4.
It is an enlarged cross-sectional view along the top line in the figure. 40... Heat exchanger main body, 44... Heat exchange element, 46... Pipe through which seawater passes, 60...
Partition wall, 62...first chamber, 63...second chamber, 64...
...Engine coolant inlet, 68...Engine coolant outlet, 70...Exhaust pipe, 76...Cooling water outlet pipe.

Claims (1)

[Claims] 1 The heat exchanger main body is divided into a first chamber and the remaining second chamber by a partition wall, and a heat exchange element equipped with a plurality of pipes through which a low-temperature secondary fluid passes is provided inside the heat exchanger main body. one end of the heat exchange element penetrates the partition wall and is located in the first chamber, and the engine cooling water inlet of the heat exchange element is located in the first chamber.
Most of the heat exchange element is located in the second chamber, and the engine cooling water outlet of the heat exchange element opens into the second chamber, and the exhaust pipe communicating with the engine combustion chamber is connected to the heat exchanger body. In the engine cooling water heat exchanger installed below the heat exchange element, the exhaust pipe is arranged in the second chamber, and the engine cooling water outlet communicating with the engine side is opened near the exhaust pipe of the heat exchanger body. An engine cooling water heat exchanger characterized by: