JPH0354017A - Hot water type heating device for vehicle - Google Patents

Abstract

PURPOSE:To improve the rise performance of heating by flowing out engine cooling water reserved in an insulated tank to a hot water pipe for heating at the time of engine starting, and making the cooling water directly pass the hot water pipe and not through the insulated tank when the cooling water reaches a given temperature. CONSTITUTION:An insulated tank 60 having a cooling water reserving part 61 in its inside in connected to the halfway part of a hot water pipe 34 leading engine cooling water from an engine 10 to a heater core 50. That is, a hot water pipe 34a is connected to the lower part of the reserving part 61 via a first inflow pipe 70, and a constant flow valve 71, which is opened when the pressure of the cooling water reaches a given pressure, is interposed in the course of the pipe 70. Moreover a second inflow pipe 72 bypassing the constant flow valve 71 branches to the first inflow pipe 70, and the downstream end of the second inflow pipe 72 is connected to the first inflow piping 70 via a valve port opened/closed with a valve body 77 in which a thermo wax 75 opened to a runoff piping 73 is a driving source. The runoff piping 73 is connected to a hot water piping 34b, and an opening/closing valve 78 opened at a given temperature or higher is interposed between the hot water pipes 34a and 34b.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a hot water heating system for a vehicle that can heat the interior of a vehicle when the temperature of the engine cooling water is low, such as immediately after starting the engine.

[Conventional technique]

BACKGROUND ART Conventionally, hot water type heating devices using engine cooling water as a heat source have generally been used as vehicle heating devices. When the temperature of the engine cooling water is low immediately after starting the engine, such as early in the morning in winter, high-temperature engine cooling water is kept warm in an insulated tank in order to immediately heat the engine, and this engine cooling water is used to start the engine. A system has been proposed in which the water immediately flows out to the heater core side.

The hot water type heating device will be explained below.

As shown in FIG. 4, a heat-insulating tank 1 for storing high-temperature engine cooling water is formed by an outer wall 1a and an inner wall 1b, and has a structure that is insulated from the outside. And an inlet pipe 2 that allows engine cooling water to flow into the insulated tank 1.
And an outlet pipe 3 is provided for causing engine cooling water to flow out from inside the heat insulating tank l. The inlet pipe 2 is provided with a constant flow valve 4 that opens according to pressure in order to allow engine cooling water to flow into the heat insulating tank 1 at a constant flow rate.

In addition, the inlet pipe 2 is connected to a hot water pipe 5a through which engine cooling water flows from the engine (not shown) side, and the outlet pipe 3 is connected to a hot water pipe 5b through which engine cooling water flows toward the heater core (not shown) side. ing. An on-off valve 6 is provided in a connecting pipe 5C that connects the hot water pipe 5a and the hot water pipe 5b. With the above configuration, the engine cooling water that becomes hot when the vehicle is running is stored in the heat insulating tank 1. As a result, when the temperature of the engine cooling water is low immediately after starting the engine, such as early in the morning in winter, the on-off valve 6 is closed and the engine cooling water, which remains relatively high temperature in the insulation tank 1, is diverted to the constant flow valve. 4, it flows out to the heater core side at a constant rate. Therefore, the vehicle interior can be heated immediately after starting the engine.

[Problem to be solved by the invention]

Here, in order to immediately heat the passenger compartment immediately after starting the engine using a certain amount of engine cooling water stored in the heat insulating tank 1, the engine cooling water should be supplied to the heater core at a large flow rate immediately after starting the engine. It is desirable to have the engine cooling water flow into the heater core at a minute flow rate.

Therefore, in the conventional system, a constant flow rate of engine cooling water is allowed to flow into the heat insulating tank 1 little by little using the constant flow valve 4, so it is difficult to heat the engine immediately after starting the engine, resulting in a slight delay. There was a problem that

Furthermore, when the amount of engine cooling water flowing through the constant flow valve 4 is increased, the high temperature engine cooling water in the heat insulating tank 1 runs out relatively quickly. Therefore, there is a problem that engine cooling water, which is still relatively cold, may flow into the heater core, making it temporarily impossible to heat the vehicle interior.

It is also possible to electrically control the constant flow valve 4 to regulate the amount of engine cooling water flowing into the heat insulating tank 1, but this would complicate the structure and increase costs. There's a problem.

An object of the present invention is to efficiently heat the interior of a vehicle immediately after starting the engine by using a simple and inexpensive method.

[Means for solving the problem] A vehicle that heats the interior of a vehicle by using engine cooling water that is heated by cooling the vehicle engine and causing the engine cooling water to flow into a heat exchanger through hot water piping. The hot water type heating system includes: an insulated tank that is insulated from the outside and has a storage section for storing engine cooling water; and an insulating tank that is insulated from the outside and has a storage section for storing engine cooling water; a first inflow pipe branched from the hot water pipe to allow cooling water to flow in; a first inflow pipe arranged in parallel with the first inflow pipe to divert engine cooling water flowing in the hot water pipe from the engine side;
a second inflow pipe branched from the hot water pipe to allow engine cooling water to flow into the reservoir; one side opens to the reservoir, the other side includes the first inflow pipe, the second inflow pipe, and the hot water pipe; It joins the hot water pipe at a position downstream of the branch point with the hot water pipe and opens into the hot water pipe, and causes the engine cooling water to flow out from the storage part and join the engine cooling water flowing in the hot water pipe. and an outflow pipe for causing engine cooling water to flow out to the heat exchanger; and an outflow pipe for causing engine cooling water to flow out from the storage part through the outflow pipe, and storing the engine cooling water in the storage part before starting the engine according to the temperature of the engine cooling water flowing out from the storage part through the inside of the outflow pipe. a displacement member that is displaced with a reaction delay of a predetermined time that is more frequent than the time it takes for all engine cooling water to flow out; and an opening/closing member that moves due to the displacement of the displacement member and connects and disconnects the second inflow pipe. is provided in the first inflow pipe, and the engine cooling water from the engine side is transferred to the storage part by the pressure of the engine cooling water at a rate less than the amount of engine cooling water flowing through the second inflow pipe and a predetermined amount. communication between a constant flow valve for inflow and a hot water pipe located downstream of a branch point of the first and second inflow pipes and upstream of a junction of the outflow pipe and the hot water pipe; Adopt technical means to provide an opening/closing means for shutting off and

Then, after starting the engine, the second
Engine cooling water is caused to flow into the reservoir through the inflow pipe, and the displacement member is displaced by the temperature of the engine cooling water that flows out from the reservoir through the outflow pipe due to the inflow, thereby opening and closing the opening/closing member. Move the second
The communication of the outflow pipe is cut off, and the amount of engine cooling water that flows from the engine side through the first inflow pipe and into the storage portion by the constant flow valve is smaller than the amount of engine cooling water flowing through the second inflow pipe and at a predetermined rate. After the engine cooling water is introduced, when the temperature of the engine cooling water reaches a predetermined temperature,
The hot water piping is communicated with the opening/closing means.

[Operation] When the engine is started, engine cooling water flows from the hot water piping.
It passes through the second inflow pipe and flows into the reservoir. Accordingly, the engine cooling water in the reservoir flows out from the outflow pipe into the hot water pipe. When the displacement member is displaced after a predetermined time delay due to the temperature of the engine cooling water flowing in the outflow pipe from the reservoir, the opening/closing member moves and blocks communication with the second inflow pipe. Therefore, the pressure of the engine cooling water increases, and this pressure opens the constant flow valve, and the engine cooling water flows into the first inlet at a rate smaller than the amount of engine cooling water flowing in the second inflow pipe and at a predetermined rate. It passes through the pipe and flows into the reservoir. After this, the engine coolant is heated by the engine, and when the engine coolant temperature reaches a predetermined temperature,
The opening/closing means opens, and engine cooling water flows into the heat exchanger side through the hot water piping section.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the vehicle hot water heating system of the present invention will be described based on the drawings.

As shown in FIG. 2, the engine cooling water heated by cooling the vehicle drive engine 10 passes through the pipe 30 by the operation of the water pump 20, and is transferred to the radiator 4.
Sent to 0. Then, the heated engine cooling water is cooled by the radiator 4o, passes through the hot water pipe 31, and is sent to the engine 10. Note that a bypass pipe 32 is connected to the hot water pipe 30 and the hot water pipe 31 in parallel with the radiator 40, so that the engine cooling water flowing to the radiator 40 is bypassed. Further, a thermoswitch 33 is provided at the connection between the hot water pipe 3l and the bypass pipe 32, and allows the engine cooling water to flow into the radiator 40 or into the bypass pipe 32.

In addition, the engine cooling water heated by cooling the engine IO passes through the hot water piping 34 and passes through the heater core (
heat exchanger) 50. The interior of the vehicle is heated by heating the air passing through the heater core 50 with engine cooling water.

The engine cooling water that has passed through the heater core 50 passes through the hot water pipe 35 and is sent to the engine 10.

In addition, a water valve 36 is provided in the hot water pipe 34,
The flow of engine cooling water into the heater core 50 is controlled.

Further, the hot water pipe 34 is provided with a heat insulating tank 6o.

As shown in FIG. 1, the heat insulating tank 60 is made of stainless steel and has a reservoir 6l for storing engine cooling water therein. One end 70a of the first inflow pipe 7o is open at the lower part of the reservoir 6l. First inflow pipe 7
The other end 70b of 0 is connected to a hot water pipe 34a through which engine cooling water from the engine 10 side flows. Also, the lth
The inflow pipe 70 is provided with a constant flow valve 71 that opens when the pressure of the engine cooling water flowing into the first inflow pipe MAO reaches a predetermined pressure. Also, one end 72a of the second inflow pipe 72 is connected to the pipe portion 70c of the first inflow pipe 70 located upstream of the constant flow valve 71.
are connected. A valve seat 72b is provided near the opening of one end 72a to the first inflow pipe 70. The other end 72C of the second inflow pipe 72 is connected to the first inflow pipe 70 located upstream of the constant flow valve 71. In the present invention, the inflow pipe located upstream from the connection between the first inflow pipe 70 and the second inflow pipe 72 is considered to be part of the hot water pipe. Also, the other end? 2c may be connected to the hot water pipe 34a.

Also, one end 73a of the outflow pipe 73 is provided at the upper part of the reservoir 6l.
is open, and the other end 73b is connected to a hot water pipe 34b that flows engine cooling water to the heater core 50 side. Further, one end 74a of a connecting pipe 74 is connected to the outflow pipe 73. The other end 74b of the connection pipe 74 is connected to the pipe section 70c.

Inside the connecting pipe 74 is a thermowax 75 which is a displacement member.
is provided. A connecting rod 76 is attached to the thermowax 75.
One end is connected, and the other end is connected to a dish-shaped valve body 77. The valve body 77 abuts against the valve seat 72b and blocks communication between the first inflow pipe 70 and the second inflow pipe 72. still,
Communication between the connection pipe 74 and the first inflow pipe 70 is cut off.

In addition, a connecting piping section (a part of the hot water piping) 34C that connects the hot water piping 34a and the hot water piping 34b is equipped with an on-off valve (opening/closing means) that opens when a predetermined temperature (approximately 40 to 45 degrees Celsius) is reached. ) 78 are provided. By using thermowax or the like for this on-off valve 78, it can be constructed at low cost and simple. Further, the on-off valve 78 may be electrically controlled by providing a temperature sensor or the like.

Next, the operation of one embodiment of the above structure will be explained.

The water bomb 20 is driven by starting the engine 10. When the heating device is in operation with the water valve 35 open, engine cooling water flows from the engine 10 side not only to the hot water piping 30 side but also to the hot water piping 34 side. At this time, since the temperature of the engine coolant is relatively low (approximately 0° C. in winter), the on-off valve 78 is closed and the connecting pipe portion 4C is closed. Therefore, the engine cooling water flows from the hot water pipe 34a to the pipe section 70d of the first inflow pipe 70.
and flows into the second inflow pipe 72. Then, the engine cooling water passes through the piping section 70c of the first inflow piping 70 from the second inflow piping 72, and flows into the storage section 6l (approximately 6 1
7min).

Approximately 41 relatively high temperature (approximately 80°C) engine cooling water is stored in the reservoir 61 in advance, so when new engine cooling water flows in, the high temperature engine cooling water flows to one end of the outflow pipe 73. From 73a, outflow pipe 7
It flows into 3.

Here, since the engine cooling water that has flowed into the outflow pipe 73 has a high temperature, the thermowax 75 expands to the left in the figure due to the temperature of this engine cooling water. Therefore, by moving the connecting rod 76 to the left in the figure, the valve body 7
7 is in contact with the valve seat 72b, and one end 72 of the first inflow pipe 70
The a side is occluded. Therefore, engine cooling water no longer flows through the second inflow pipe 72. After this, when the pressure of the engine cooling water flowing into the piping section 70d increases, the constant flow valve 7
1 opens, and the engine cooling water flows at a predetermined flow rate (approximately 1.5
1 7 min), it flows only in the first inflow pipe 70 and flows into the storage section 61. Note that the heater core 5 is
Considering the water capacity of the flow path up to 0, the valve body 77 is
This causes a delay in the response time until contact occurs. For example, if the water capacity of the channel is set to 0. 6 1 /min, the response time until the valve body 77 comes into contact with the valve seat 72b is about 10 seconds.

Then, the engine cooling water that has flowed into the inflow pipe 73 passes through the hot water pipe 34b and flows into the heater core 50. Therefore, even when the temperature of the engine cooling water is low, immediately after starting the engine, the engine cooling water is supplied to the heater core 5 at a large flow rate.
By setting the temperature to 0, the interior of the vehicle can be heated immediately.

Thereafter, the engine cooling water is heated by the engine 10, and when the engine cooling water reaches a predetermined temperature, the on-off valve 78
opens, the heated engine cooling water flows into the insulated tank 6.
0 and flows into the heater core 50 through the hot water pipe 34b. Therefore, the interior of the vehicle can be heated continuously from immediately after the engine 10 is started.

Next, other embodiments will be described.

In one embodiment, thermowax 75 is used as the elastic member, but as shown in FIG. 3, a diaphragm 80 filled with gas may also be used.

By expanding and contracting the diaphragm 80, the valve body 77 can be moved and the second inflow pipe 72 can be opened and closed. Other configurations and operations are the same as in the first embodiment.

As described above, the same effects as in the first embodiment can be obtained.

In the present invention, one end 70a of the first inflow pipe 70 is opened to the reservoir 61, and the other end 70b is connected to the hot water pipe 34a, but one end 72a of the second inflow pipe 72 is opened to the reservoir 61, The other end 72b may be connected to the hot water pipe 34a.

Alternatively, one end 70a, 72a of each of the first inflow pipe 70 and second inflow pipe 72 may be opened to the reservoir 61, and the other ends 70b, 72b may be connected to the hot water pipe 34a.

Further, the displacement member may be a member that contracts depending on the temperature of the engine cooling water, and the communication with the second inflow pipe may be cut off by the displacement member contracting.

(Effects of the Invention) As described above, the present invention allows engine cooling water to flow into the reservoir from the second inflow pipe immediately after starting the engine,
Thereafter, the amount of engine cooling water flowing through the second inflow pipe is smaller than that flowing through the first inflow pipe, and the engine cooling water can be allowed to flow into the reservoir at a predetermined rate. The engine cooling water can be flowed into the reservoir at a small flow rate and then at a predetermined rate. Therefore, the heating of the vehicle interior can be quickly started immediately after the engine is started, and the interior of the vehicle can be properly heated.

In addition, the opening/closing member is moved by the displacement of the displacement member due to the temperature of the engine cooling water flowing in the outflow pipe, and the opening/closing member is moved to the second position. Since the communication between the fL and the human piping can be cut off, the structure can be made inexpensive and extremely simple.

[Brief explanation of drawings]

Figure 1 and Figure 2 are diagrams showing one embodiment of the present invention.
2 is a schematic sectional view, FIG. 2 is a schematic sectional view of a hot water circuit, FIG. 3 is a schematic sectional view showing another embodiment of the present invention, and FIG. 4 is a schematic sectional view of a conventional embodiment. 10...Engine, 34...Hot water piping, 50...
Heater core (heat exchanger), 60...insulation tank, 61
. . . Storage portion, 70 . . . First inflow pipe, 71 . . . Constant flow valve. 72...Second inflow pipe. 73...Outflow pipe, 74...Thermowax (displaceable member). 77...
Valve body (opening/closing member). 7th...Opening/closing valve (opening/closing means).

Claims (1)

[Claims] (1) In a vehicle hot water heating system that uses engine cooling water heated by cooling the vehicle running engine and flows the engine cooling water into a heat exchanger through hot water piping to heat the interior of the vehicle. , an insulated tank that is insulated from the outside and has a storage section for storing engine cooling water; and the engine cooling water flowing in the hot water pipe from the engine side is diverted, and the engine cooling water is caused to flow into the storage section. a first inflow pipe branched from the hot water pipe; and a first inflow pipe arranged in parallel with the first inflow pipe to divert engine cooling water flowing in the hot water pipe from the engine side;
a second inflow pipe branched from the hot water pipe to allow engine cooling water to flow into the reservoir; one side opens to the reservoir, the other side includes the first inflow pipe, the second inflow pipe, and the hot water pipe; It joins the hot water pipe at a position downstream of the branch point with the hot water pipe and opens into the hot water pipe, and causes the engine cooling water to flow out from the storage part and join the engine cooling water flowing in the hot water pipe. an outflow pipe for causing the engine cooling water to flow out to the heat exchanger; and an outflow pipe for causing the engine cooling water to flow out from the storage part through the outflow pipe, the engine cooling water being stored in the storage part before starting the engine, depending on the temperature of the engine cooling water flowing out from the storage part through the outflow pipe. a displacement member that is displaced with a reaction delay of a predetermined time shorter than the time it takes for all of the engine cooling water that has been in the engine to flow out; an opening/closing member that moves due to the displacement of the displacement member and connects and disconnects the second inflow pipe; Provided in the first inflow pipe, the engine cooling water from the engine side is caused to flow into the reservoir at a predetermined rate, which is less than the amount of engine cooling water flowing through the second inflow pipe, by the pressure of the engine cooling water. A constant flow valve and a hot water pipe located downstream of a branch point of the first and second inflow pipes and upstream of a junction of the outflow pipe and the hot water pipe are connected or cut off. and opening/closing means for causing engine cooling water to flow into the reservoir from the engine side through the second inflow pipe after the engine is started, and to cause engine cooling water to flow from the reservoir through the outflow pipe with this inflow. The displacement member is displaced depending on the temperature of the engine cooling water flowing out, thereby moving the opening/closing member to cut off communication with the second outflow pipe, and the constant flow valve allows cooling water to flow from the engine side through the first inflow pipe. , the second
Engine cooling water is allowed to flow in at a predetermined rate that is less than the amount of engine cooling water flowing through the inflow pipe, and then, when the temperature of the engine cooling water reaches a predetermined temperature, the opening/closing means connects the hot water pipe. A vehicle hot water heating system characterized by: