JPH0240461A - Engine-driven type heat exchanger - Google Patents

Abstract

PURPOSE:To miniaturize a cooling fan and protect a silencer from being corroded by detecting cooling water temperature to control the exhaust gas flow of a bypass pipeline attached to an exhaust gas heat exchanger. CONSTITUTION:A variable valve 9 is provided in a bypass pipeline 15 to perform the opening control of the variable valve 9 on the basis of a detecting signal of a water temperature sensor 11. When the temperature of cooling water increases, the variable valve 9 is opened and an exhaust gas quantity which passes through the bypass pipeline 15 and is released in the outside through a silencer 3 increases. Therefore releasing heat quantity from a radiator 4 does not exceed the fixed quantity and exhaust heat alone from an engine 1 is released from the radiator 4. Further, since exhaust gas temperature of the silencer 3 is not equal to or lower than the fixed value and kept high, the production of drain is controlled not to corrode the silencer 3. Further, since the releasing heat quantity of the radiator 4 reduces, a cooling fan for the radiator 4 can be miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an engine-driven heat exchange device, and particularly to an engine-driven heat exchange device that efficiently utilizes heat recovered from engine exhaust gas.

<Prior Art> FIG. 4 is a block diagram showing the configuration of a conventional engine-driven heat exchanger, in which an MPFC gas pipe 13 is led out from the engine, and this exhaust gas pipe 13 is led to the exhaust gas heat exchanger 2. It's dark. In this exhaust gas heat exchanger 2, an exhaust gas pipe 13 is disposed facing a cooling water pipe 14, which will be described later, so as to be able to exchange heat, and is led out from the exhaust gas heat exchanger 2, and is discharged to the outside via a muffler 3. is installed.

The cooling water pipe 14 through which the cooling water of the engine 1 flows is connected to the radiator 4 and the exhaust gas heat exchanger 2 after leaving the engine 1.
A first flow path is formed that passes through the engine 1 (knee). In this first flow path, a stop valve 6 and a water A pump 8 is inserted into the cooling water pipe 14.The cooling water pipe 14 has a first flow path that branches off before the radiator 4 after leaving the engine, and after passing through the hot water heat exchanger 5, the first flow path branches again. flows into the engine 1, passes through the exhaust gas heat exchanger 2, and flows into the engine 1.
A second flow path is formed that returns to the . In this second flow path, a stop valve 7 is inserted between the outlet of the hot water heat exchanger 5 and the water pump 8.

In a conventional engine-driven heat exchanger with such a configuration, the stop valve 6 is closed and the stop valve 7 is opened (thereby, the cooling water containing the heat recovered from the exhaust gas in the exhaust gas heat exchanger 2 is The waste heat thus generated is guided to the hot water heat exchanger 5 as necessary, and when applied to the Kaikoba VI4 machine, is used for the purpose of preventing frost formation during heating operation at low temperatures.

<Problems to be Solved by the Invention> In the conventional engine-driven heat exchange device described above, when the exhaust heat including the heat recovered from the exhaust gas by the exhaust gas heat exchanger 2 is not used, the stop valve 7 is closed. By opening the stop valve 6, the heat of the high temperature cooling water is radiated by the radiator 4.

For this reason, the radiator 4 (this is required to have the capacity necessary to radiate the exhaust heat of the engine 1 itself and the exhaust gas),
The radiator 4 becomes larger. Furthermore, as the radiator 4 itself becomes larger, the capacity of the cooling fan attached to the radiator 4 also becomes larger, resulting in more noise.

Therefore, there are problems in that the overall size of the device increases, manufacturing cost increases, and noise also increases.

On the other hand, in the conventional engine-driven heat exchange device, the exhaust gas released from the exhaust gas pipe 13 is transferred to the exhaust gas heat exchanger 2.
The heat is exchanged at the temperature of 150° C., and the temperature is lowered to about 150° C. before being supplied to the muffler 3.

For this purpose, condensed water is removed from the exhaust gas in the muffler 3.
A so-called drain is generated and adheres to the inner wall of the muffler 3. Since this drain is acidic, there is also the problem that the muffler 3 will corrode due to adhesion of the drain.

The purpose of the present invention is to reduce the volume of the radiator, thereby making the cooling fan smaller and less noisy, suppressing the generation of drain, preventing muffler corrosion and environmental damage, and reducing the overall size and manufacturing costs. The objective is to provide an engine-driven heat exchanger for

Means for Solving the Problems> In the present invention, the cooling water temperature is detected and the exhaust gas flow rate in the bypass pipe line attached to the exhaust gas heat exchanger is controlled.

That is, a heat pump circuit including a compressor, a refrigerant flow switching valve, an indoor heat exchanger, a pressure reducing element, and an outdoor heat exchanger is formed, and the compressor is driven by an engine, and the exhaust gas from the engine is guided. An engine-driven heat exchange device provided with a gas heat exchanger and in which exhaust heat recovered by the exhaust gas heat exchanger is supplied to a radiator or a hot water heat exchanger,
a bypass pipe line connecting the upstream side and the downstream side of the exhaust gas heat exchanger, a flow rate adjustment means for adjusting the flow rate of the bypass line, and a water temperature sensor that detects the coolant temperature at the outlet of the coolant pipe from the engine; A control means for controlling the flow rate r141 means based on a detection signal from the water temperature sensor.

<Function> In the present invention, when the water temperature sensor detects the cooling water temperature at the engine outlet of the cooling water pipe, the control means that operates based on this detection signal controls the flow rate adjustment means and controls the cooling water temperature at the engine outlet of the cooling water pipe. The flow rate of the bypass line is controlled. The flow rate of the bypass pipe is controlled based on the detection signal of the water temperature sensor, and as the water temperature rises, the amount of cooling water flowing through the bypass pipe is increased.

Therefore, when the cooling water temperature reaches 80°C, the bypass pipe is fully opened, so the cooling water temperature does not rise abnormally, and the temperature of the exhaust gas inside the muffler 3 does not drop too much. Control is carried out in an unprecedented manner.

Embodiments Hereinafter, embodiments in which the present invention is applied to an air W4 aircraft will be described in detail using the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. In this embodiment, in contrast to the conventional device shown in FIG. Road 1
5 is attached, and this bypass conduit 15 is provided with a variable I valve 9.

Furthermore, at the outlet of the cooling water pipe 14 from the engine 1,
A water temperature sensor 11 that detects the temperature of the cooling water is provided, and the variable valve 9 is activated based on the detection signal of the second water temperature sensor 11 and the detection signal of the mode sensor 16 that detects the cooling/heating mode.
The actuator 10 is configured to control the opening degree of the actuator 10.

The opening/closing control of the variable valve 9 by the actuator 10 based on the detection signal of the water sensor 11 is performed according to the characteristic line of water temperature and opening degree shown in FIG.

The operation of the embodiment having a configuration like 2 will be explained according to the flowchart r-1- in FIG.

In step S-1 of flowchart 1 in FIG.
It is determined whether or not the cooling mode is set based on the detection signal of the mode sensor 16. If it is determined that the cooling mode is set, the process proceeds to step S-2, where the stop valve 6 is opened and the radiator 4
is turned ON, the stop valve 7 is opened, and the hot water heat exchanger 5 is turned ON.
It is considered FF.

Then, the process proceeds to step S-3, and based on the detection signal of the water temperature sensor 11, the opening degree of the variable valve 9 is controlled according to the characteristics shown in FIG.

In this control, when the water i1 of the cooling water rises, the variable valve 9 is opened, and the amount of exhaust gas that passes through the bypass passage 15 and is discharged to the outside via the muffler 3 increases.

Therefore, the amount of heat released from the radiator 4 does not exceed a predetermined amount (when the variable valve 9 is fully open, only the exhaust heat from the engine 1 is released from the radiator 4. Since the exhaust gas temperature inside the muffler 3 does not fall below a predetermined value and the exhaust gas temperature inside the muffler 3 is maintained at a high temperature, the generation of drain is suppressed and the muffler 3
No corrosion or environmental damage occurs.

In step S-1 of flowchart 1 in FIG.
If it is determined that the mode is heating mode, the process proceeds to step S-4, where the stop valve 6 is closed and the radiator 4 is turned off, and the radiator 7 is opened and the hot water heat exchanger 5 is turned on. The process then proceeds to step S-5, where the variable valve 9 is closed and the bypass passage 15 is turned off.

In this state, all the high-temperature cooling water from which heat has been recovered from the exhaust gas in the exhaust gas heat exchanger 2 is supplied to the hot water heat exchanger 5, and is used, for example, to prevent frost formation on the heat exchanger.

According to the embodiment, the amount of heat released by the radiator 4 can be reduced, so the radiator 4 is made small in capacity and the cooling fan for the radiator 4 is also made small.
It becomes possible to downsize the entire device. Further, if the cooling fan is made smaller, fan noise can be reduced, and the generation of drain can be suppressed, thereby preventing corrosion of the muffler 3 and environmental damage caused by the release of drain.

<Effects of the Invention> As explained in detail above, according to the present invention, the radiator and the cooling fan for the radiator are miniaturized, the entire device is miniaturized and the noise is reduced, the amount of drain discharged is reduced, and the muffler An engine-driven heat exchange device is provided that provides corrosion protection and environmental protection.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, and FIG.
The figure is a flowchart showing the operation of the embodiment of the present invention.
The figure is a characteristic diagram showing the relationship between the cooling water temperature and the flow rate of the bypass flow path in an embodiment of the present invention, and FIG. 4 is a block diagram showing the configuration of a conventional engine-driven heat exchange device.

Claims (1)

[Claims] A heat pump circuit including a compressor, a refrigerant flow switching valve, an indoor heat exchanger, a pressure reducing element, and an outdoor heat exchanger is formed, and the compressor is driven by an engine, and the exhaust gas of the engine is The engine-driven heat exchange device is provided with an exhaust gas heat exchanger to which exhaust gas is guided, and the exhaust heat recovered by the exhaust gas heat exchanger is supplied to a radiator or a hot water heat exchanger, the exhaust gas heat exchanger a bypass pipe connecting the upstream and downstream sides of the engine, a flow rate adjustment means for adjusting the flow rate of the bypass pipe, a water temperature sensor that detects the cooling water temperature at the outlet of the cooling water pipe from the engine, and a water temperature sensor based on the detection signal of the water temperature sensor. and control means for controlling the flow rate adjusting means.