JPH0452459Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to an engine silencer.

[Conventional technology]

Traditionally, water supply has been heated using the following three methods:

(a) Heat the feed water with engine cooling water (80° to 90°C) using a heat exchanger, (b) Warm the feed water with an engine exhaust gas boiler, and (c) connect (a) and (b) in series. use something
A silencer is also provided separately.

[Problem that the invention attempts to solve]

(b) If engine cooling water is used as the only heat source, the temperature of the engine cooling water may drop due to changes in engine load, and the water supply may not be heated sufficiently.

(b) When the feed water is heated by an engine exhaust gas boiler, the feed water cannot be heated when the engine is under light load, and the feed water temperature rises when the engine is under high load, making it difficult to adjust to obtain appropriately hot water. .

(c) When the amount of water used fluctuates, the temperature of the water is likely to change.

(d) There is a lot of waste when using an exhaust gas boiler and a silencer together.

[Means for solving problems]

The purpose of the present invention is to provide a muffler that eliminates the above-mentioned drawbacks.The feature is that engine cooling water from the engine flows through the muffler through which exhaust gas flows. A first heat exchanger is configured to conduct heat exchange between the exhaust gas and engine cooling water by conducting a feed water heating pipe, and a water feed pipe through which feed water flows is connected to the inside of the feed water heating pipe to cool the engine. A second heat exchanger for exchanging heat with water is provided, and a thermostat is provided for controlling the water temperature at the outlet of the water supply heating pipe.

[Effect]

In this case, (1) the temperature of the engine cooling water is approximately 80°C during normal operation, but during light loads, the capacity provided to the heat exchanger may be insufficient and the temperature may drop. To compensate for this, the feed water is further heated in the feed water heating pipe using the engine exhaust gas inside the muffler.

(2) When the engine is under high load, in order to suppress the rise of engine cooling water, the thermostat installed at the outlet of the feed water heating pipe opens at approximately 98°C, and the cooling water pressurized by the engine pump begins to flow, causing the water temperature to rise. prevent.

(3) In addition to being a unit that uses waste heat, the engine also has the necessary muffler function, so the overall shape is an expansion type muffler, which has two functions.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory diagram showing one embodiment of a silencer according to the present invention.

In the figure, a water supply heating pipe 1 is provided within a silencer 4, and a thermostat 2 that opens at approximately 98° C. is provided at the outlet. Furthermore, a water supply pipe 3 is provided within the water supply heating pipe 1.

Thus, the first heat exchanger exchanges heat between the exhaust gas and the engine cooling water through the wall of the water supply heating pipe 1, and the heat exchange between the engine cooling water and the water supply through the wall of the water supply pipe 3. A second heat exchanger is configured to perform the following.

Figure 2 shows the connections between the engine, muffler exhaust, and cooling water. Cooling water pressurized by the engine pump 5 is partially branched from a pipe connected to the main heat exchanger 7 at the engine outlet and connected to a feed water heating pipe of the muffler 4. The engine cooling water flowing out from the feed water heating pipe 1 passes through the thermostat 2, joins the pipe connected to the main heat exchanger 7 at the engine pump inlet, and enters the engine pump 5.

The engine exhaust gas is connected to the muffler 4 from the engine 6 outlet, and is discharged from the outlet to the outside via an exhaust pipe.

When the temperature of the engine cooling water pressurized by the engine pump 5 is low in the feed water heating pipe 1, such as when the engine is under light load, the thermostat 2 is closed and the water remains stationary, and the feed water is heated by the exhaust gas. .

In addition, when the temperature inside the feed water heating pipe 1 rises and reaches approximately 98°C when the engine 6 is under high load, the thermostat 2 opens and engine cooling water flows, keeping the temperature inside the feed water heating pipe 1 below approximately 98°C. be able to.

Since the feed water is always heated by engine cooling water close to 98°C in the feed water heating pipe 1, stable hot water can be obtained without being greatly affected by engine load or water supply amount.

The overall shape of the muffler is the same as that of a general expandable muffler, and it also serves as a sound muffling function.

[Effect of idea]

The above case has the following effects.

(1) When using exhaust heat from the engine, hot water within a certain range can be obtained without imposing conditions on the engine load condition or the frequency of water supply.

(2) One unit has the functions of a heat exchanger, exhaust gas boiler, and silencer, which simplifies the on-site construction compared to installing each device separately, and greatly reduces the overall cost.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing one embodiment of a muffler according to the present invention, and FIG. 2 is an explanatory diagram showing connections between the engine, the exhaust gas of the muffler, and cooling water. 1... Water supply heating pipe, 2... Thermostat, 3
...Water pipe, 4...Silencer.

Claims (1)

[Scope of utility model registration request] A first heat exchanger that exchanges heat between the exhaust gas and the engine cooling water by connecting a feed water heating pipe through which the engine cooling water from the engine flows through the muffler through which the exhaust gas flows. A second heat exchanger is configured to conduct heat exchange between the engine cooling water and the feed water by connecting a water supply pipe through which the feed water flows through the feed water heating pipe, and the water temperature at the outlet of the feed water heating pipe is adjusted. An engine silencer characterized by being equipped with a thermostat that controls.