JPS61235215A - Immediately effectual heating apparatus for vehicles - Google Patents

Abstract

PURPOSE:To secure a efficient immediately heating effect, by constituting a device in transmitting heat of exhaust gas to a heat insulating tank timely via a heat pipe, in case of the device which utilizes the heat of hot water inside the heat insulating tank storing a part of engine cooling water and performs immediately effectual heating at the time of engine cold. CONSTITUTION:At the time of engine starting, whether cooling water temperature inside a heat insulating tank 7 is more than the specified value (about 90 deg.C) or not is judged from output of a water temperature sensor 25 at a control circuit 16, and when YES is the case, a valve 10 is closed but valves 11-13 are closed, making a water pump 14 operate. In addition, a solenoid 23 installed in a heat supplying chamber 18 is energized with a continuous rating current, opening a shutter 21, and exhaust gas inside an exhaust pipe 15 is led into the heat supplying chamber 18, whereby heat of the exhaust gas is fed to the inside of a pretank 9 via a heat pipe 17, thus an immediate heating effect is yet more heightened. Afterward, with the progress of warming up, the valve 10 is opened and the valve 12 is closed instead, and when temperature inside the heat insulating tank 7 becomes more than the setting one (about 120 deg.C), the solenoid 23 is unenergized, having the shutter 21 closed.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention provides a heat source for emergency heating at the time of starting the engine of a vehicle interior heating system that uses engine cooling water as a heat source.
The present invention relates to an instant heating device that uses engine cooling water stored in a heat retention tank.

[Conventional technology]

In-vehicle heating for vehicles that use an internal combustion engine as a driving power source is generally done by heating the air using a patented tacoa that features engine cooling water, so it is natural that after the engine starts, engine cooling is performed. When the water temperature is low, it is not possible to warm up the inside of the car immediately, and you have to feel cold for a while. Therefore, as disclosed in Japanese Patent Publication No. 59-26482, a portion of the engine cooling water that has been sufficiently heated while the car is running is stored in a heat insulating tank.
A method has been devised to provide this hot water to the heater core during periods when the engine cooling water temperature is low. In response to this, the present inventors have already used a heat pipe with irreversible heat transfer properties in which a heat transfer medium such as methanol, benzene, water, etc. is sealed in the pipe material, and the exhaust heat is transferred from the engine exhaust pipe into a heat insulating tank. A patent application was filed in 1983 for a method to further raise the temperature of engine cooling water in the heat insulating tank and increase the immediate heating effect.
It is proposed in No. 8838.

[Problem that the invention seeks to solve]

However, in the above-mentioned instant heating system equipped with a heat pipe, if the evaporator side of the heat pipe is constantly exposed to engine exhaust gas, the engine cooling water temperature will rise abnormally, causing the inside of the heat insulating tank to become abnormally high temperature and high pressure. If you circulate the engine cooling water in the insulation tank to avoid this, the engine cooling water temperature will rise too much, which is not good for the engine, and the condensation part on the heat dissipation side of the heat pipe will If exhaust gas heat continues to be supplied even though the heat dissipation is insufficient, the pressure inside the heat pipe may become too high. Generally, the tensile stress f applied to the outer peripheral wall of a heat pipe made of a thin cylinder due to the internal pressure is calculated using the internal pressure P, the thickness t of the pipe wall, and the outside diameter D1 of the pipe, as shown in Fig. 4. D
/2t. Normally, the maximum allowable stress f□, (f, /4) is determined by considering the safety factor of about 4 for fu in the maximum tensile strength of the heat pipe container material, and the steam pressure or steam temperature as the limit value for use. has been decided.

In addition, Figure 5 shows the relationship between the steam temperature and steam pressure of various heat pipe working fluids.As can be seen from the figure, the steam pressure increases rapidly with respect to the steam temperature, so a safety factor is taken into account. However, it has been discovered that there is a new problem in that oversupplying heat to the heat pipe can lead to damage to the heat pipe.

[Means for solving problems]

Therefore, the means of the present invention for solving the above-mentioned problems is a means for blocking the flow of exhaust gas to the exhaust gas bypass path when the temperature of the engine cooling water in the heat insulation tank reaches a predetermined temperature or higher. It is intended to provide

[Effect]

According to the above means, the supply of exhaust gas to the exhaust gas bypass passage is cut off when the temperature of the engine cooling water in the heat insulating tank exceeds a predetermined temperature, so that more heat than necessary is supplied to the heat pipe and the engine cooling water. disappears.

〔Effect of the invention〕

Therefore, according to the present invention, it is possible to avoid overheating of the engine cooling water and breakage of the heat pipe due to excessive supply of heat by the heat pipe, and there is an excellent effect that an effective regenerative type instant heating device can be provided.

〔Example〕

Next, an instant heating device for a vehicle according to the present invention will be explained based on an embodiment shown in the drawings. FIG. 1 is a diagram illustrating the components of the heating device of the present invention and their operating system, and shows the engine l
cooling water jacket 2 and vehicle interior heating unit 3
An outgoing path 5 and a return path 6 of the engine cooling water circulation pipe are connected to the heater core 4 built in the engine cooling water, and the outgoing path 5 branches off and joins the return path 6 to a heat insulating tank 7 for storing engine cooling hot water. A hot water pipe 8 is provided with a hot water pipe 8 interposed therebetween. The heat-retaining tank 7 is composed of a heat-insulating container such as a vacuum glass container, and a thermistor-type water temperature sensor 25 for detecting the temperature of engine cooling water in the heat-retaining tank 7 is disposed. In addition, this hot water pipe 8 has a heat insulating tank 7 and a confluence point 6.
A pre-tank 9 consisting of a heat insulating container or a simple container is provided between the pre-tank 7 and the pre-tank 9, and the heat retaining tank 7 and the pre-tank 9 form a heat retaining tank for heat storage. Further, a valve AIO is provided between the engine cooling water jacket 2 and the branch point 5a in the middle of the engine cooling water circulation path 5. On the other hand, a valve Bll and a valve C12 are provided in the middle of the hot water pipe 8 between the heat retention tank 7 and the pre-tank 9 and between the pre-tank 9 and the branch point 6a. On the other hand, a valve D13 is disposed in the middle of the circulation path 5 between the branch point 5a and the heater core 4. Hot water pipe 8 between the heat retention tank 7 and the branch point 5a
A water pump 14 is installed in the middle of the tank so as to feed engine cooling water to the heat insulating tank 7 side. Further, a thermistor type water temperature sensor 15 is provided in a portion of the engine coolant circulation outward path 5 near the engine 1. When the temperature inside the heat retention tank is the minimum temperature for immediate heating, that is, 90°C or higher, the control circuit 16
Valve AIO is closed based on the signal of valve Bl
1, the pulp C12, the valve D13 are opened, and the water pump 14 is operated to perform immediate heating. Further, when the engine cooling water temperature becomes higher than the temperature in the heat retention tank, the valve AIO is opened, the valve C12 is closed, and the water pump 14 is stopped, so that heating is performed by normal engine cooling water circulation. has been done. Note that even when the water pump 14 is stopped, a small amount of engine cooling water can pass through it. In addition, in the middle of the engine exhaust pipe 15, there is shown in FIG.
A heat supply chamber 18 is provided which forms an exhaust gas bypass path, the detailed structure of which will be explained in b). In FIG. 2, reference numeral 18a denotes a metal container provided on the outer periphery of the exhaust pipe 15, which is airtightly connected to the outer periphery of the exhaust pipe 15 by welding, brazing, etc., and forms the heat supply chamber 18. . 19 is an inlet for introducing exhaust gas into the heat supply chamber 18, and 20 is an outlet for returning the introduced exhaust gas to the exhaust pipe 15. When both are open, the exhaust gas is bypassed as shown by the arrow in the figure. .

17 is a pre-tank 9 which forms a heat retention tank, and a condensing part 17a at one end thereof is housed inside the pre-tank 9, and an evaporating part 1 at the other end thereof.
7b is a heat pipe housed in the heat supply chamber 18;
Supplying the heat of the exhaust gas in the heat supply chamber 18 into the pre-tank 9,
This increases the temperature of engine cooling water for heat storage. Note that since the heat supply chamber 18 is attached to the exhaust pipe, engine vibrations are transmitted to it, and if the heat pipe 17 is directly connected to the heat insulation tank 7, there is a possibility that the heat insulation tank 7, which is an insulated container, will be damaged. . Therefore, the condensing part 17a of the heat pipe 17 is connected to the pre-tank 9, and the two water inlets 9a, 9b of the pre-tank 9 and the hot water pipe line 8 are connected with elastic rubber hoses 8a, 8b, so that vibrations can be absorbed. It is. Note that 24 is a water pump disposed at the inlet of the water jacket 2 and driven by the engine. Here, a desirable form of the heat pipe 17 having the above-mentioned irreversible heat transfer characteristics is one in which methanol, benzene, water, etc. is sealed as a heat transfer medium, and a screen-shaped, groove-shaped, or foam felt wick is incorporated. The recommended pipe material is stainless steel coated with copper.

When using a gravity type heat pipe, the difference in height between the installation positions at both ends of the heat pipe must be at least 6.3 cm when copper felt is used as the wick and water is used as the working fluid. Considering the inclination of the vehicle body, it is desirable that the pre-tank 9, which accommodates the condensing part 17a of the heat pipe 17, be installed at the upper part of the vehicle. In addition, the introduction port 19 of the heat supply chamber 18 has a
A shutter 21 made of a metal plate or the like and provided so as to be able to open and close is connected to an electromagnetic solenoid 23 via an operating rod 22. 24 is fixed between a collar portion 22a integrally formed on the actuating rod 22 and a case lower surface 23a of an electromagnetic solenoid 23 which is an actuating portion, and its spring force is biased in a direction to press the shutter 21 against the outlet 19. When the coil of the electromagnetic solenoid 23 is energized, the operating part 22 is pulled up, the shutter 21 is separated from the inlet 19, and the exhaust gas is introduced into the heat supply chamber 18.

Further, the signal from the water temperature sensor 25 provided in the heat retention tank 7 is input to the control circuit 16, and the water temperature is 120°C.
In this case, when the coil of the electromagnetic solenoid 23 is de-energized based on a signal from the control circuit 16, the shutter 21 closes the introduction port 19. FIG. 3 is a flowchart illustrating the operation of the control circuit 16 that automatically operates the instant heating device configured as described above. Next, the operation of the instant heating system of the present invention will be explained based on FIGS. 1 and 2. When the engine cooling water temperature in the heat insulation tank 7 detected by the water temperature sensor 25 at the time of engine startup is 90°C or higher, the valve AIO
Close, Valve Bll, No S>tz C12, Valve D
13 to operate the water pump 14. At this time, the water supplied by the water pump 24 is circulated via a bypass path of a radiator circuit (not shown). Also, the coil of the electromagnetic solenoid 23 provided in the heat supply chamber 18 is energized, the shutter 21 is moved away from the inlet 19, and a bypass path for the exhaust gas is formed. At this time, the heat insulating tank 7 was stored while the engine was running and remained at high temperature even after the engine stopped.
The engine cooling water inside the heater core 4 is circulated through the heater core 4 to provide immediate heating (solid line arrow in Figure 1), and at the same time, the exhaust heat from the engine 1 is supplied to the pre-tank 9 through the heat pipe 17, further improving the immediate heating capacity. Contribute to The engine cooling water temperature (detected by the water temperature sensor 15) is in the heat retention tank 7.
When the water temperature rises above the water temperature (detected by the water temperature sensor 15), the valve AIO is turned off based on the signal from the control circuit 16, and the water pump 14 is stopped to bring about the normal heating state. Since a portion of the engine cooling water is supplied into the heat retention tank 7, the water temperature in the heat retention tank 7 and the water tank 9 rises (as indicated by the broken line arrow in FIG. 1).

Then, the engine coolant temperature rose further to 90℃.
At this point, by closing the valve C12, recovery of exhaust heat into the heat-retaining tank 7 via the pre-tank 9 is started. If heat recovery by the heat pipe 17 continues as it is, the internal pressure of the heat insulating tank 7 and the steam pressure in the heat pipe 17 will abnormally increase and there is a risk of damage. When the water temperature sensor 25 detects that the temperature has exceeded ℃, the control circuit 16 turns off the power to the electromagnetic solenoid 23 and presses the shutter 21 against the inlet 19, thereby preventing the exhaust gas from bypassing the heat supply chamber 18. shut off, interrupting exhaust heat recovery. Furthermore, the amount of heat that cannot be sufficiently shut off by the shutter 21 is released into the engine cooling water by closing the valve Bll and opening the valve C12 at the same time as the shutter 21 operates, increasing the pressure inside the heat insulating tank 7 and the heat pipe 17. It may be operated to prevent steam pressure from running out of control. By operating as described above, the temperature of the warm water in the heat retaining tank 7 can be maintained without causing an abnormally high pressure in the heat retaining tank 7 and the Oyohi heat pipe 17 due to excessive supply of heat from the engine exhaust gas by the heat pipe 17. By increasing the temperature, an effective immediate heating effect can be achieved.

The present invention is not limited to the above embodiments, but can be modified as follows. In addition to the electromagnetic solenoid 23, the actuating section of the shutter 21 in the present invention may include a vacuum motor or the like that utilizes engine intake negative pressure. Further, in the above embodiment, the shutter 21 was provided at the inlet 19, but it may be provided at the outlet 20 side, or the shutter 21 may be provided at the inlet 19. It may be configured such that both of the outlet ports 20 can be opened and closed at the same time. Further, in the above embodiment, the heat supply chamber 18 includes the exhaust pipe 15
Although it was provided in the middle, it may also be provided in the engine exhaust section, which has a higher temperature. The exhaust pipe 15 is provided with an exhaust purification catalyst device, and although it can be installed on either the upstream or downstream side, it is better to install it on the downstream side because it does not lower the temperature of the exhaust gas flowing into the exhaust gas purification catalyst device. preferable. In the above embodiment, the condensing part 17a of the heat pipe 17 is housed inside the pre-tank 9, but it may be in contact with the side wall of the pre-tank by using a heat transfer plate or the like.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the components and their operating system of the instant heating device for a vehicle according to the present invention, and FIG. 2(a). (b) is a cross-sectional view of the heat supply chamber 18 housing the evaporation part of the heat pipe, which is an enlarged view of the main part of FIG. 1, and its A-A.
A cross-sectional view, FIG. 3 is a flowchart of the control circuit 16 for electrically controlling the functions of the heating system components shown in FIG. 1, and FIG. FIG. 5 is a cross-sectional view illustrating the balance between pressure and internal stress when the fluid is present, and FIG. 5 is a characteristic diagram illustrating the relationship between vapor pressure and temperature of various working fluids. 1...Engine. 7... Heat retention tank, 9... Buri tank, 15...
Exhaust pipe.

Claims (1)

[Claims] In a thermal storage type instant heating device for a vehicle that stores a portion of engine cooling water in a heat retention tank and uses the heat of the hot water in the heat retention tank to provide immediate heating when the engine cooling water temperature is low. , an exhaust gas bypass path provided in the exhaust part of the engine and through which the exhaust gas of the engine flows, a condensing side connected to the heat insulating tank, and an evaporating side connected to the bypass path,
a heat pipe that transfers exhaust gas heat from the exhaust gas bypass path to the heat insulation tank; a temperature sensor that detects the engine cooling water temperature in the heat insulation tank; and a control circuit that issues a signal based on the temperature detected by the temperature sensor. , which is provided in the bypass path and opens and closes the bypass path in response to a signal from a control circuit, and when the water temperature sensor detects that the temperature in the heat retention tank has exceeded a predetermined temperature, An instant heating device for a vehicle, comprising means for receiving a signal from a control circuit and cutting off the bypass path.