JPH075016B2 - Quick heater - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a quick heater using engine exhaust heat, and more particularly to improvement of a quick heater using magnetic fluid.

[Prior Art] In winter or cold regions, there is a strong demand for a quick heater that warms immediately after riding. Many methods have been conventionally known for this quick heater. As a means for utilizing the engine exhaust heat after the engine is started, a heat pipe is used (for example, Japanese Utility Model Laid-Open No. 59-145410), a quick heater that uses circulating water or the like, and a heat storage tank are also used. There is a heat storage type (for example, JP-A-56-82619 and JP-A-59-146203).

However, the conventional quick heater has the following problems.

First, a heater using a heat pipe has problems such as high thermal resistance in the wick type, small maximum heat transfer amount, and high cost. In the thermosyphon type, the heat radiating part is located above the heat absorbing part. Therefore, there is a problem in that the degree of freedom in design is extremely reduced.

Further, a heater using circulating water requires a large amount of circulating water, so that the heat capacity of the circulating water becomes large, and rapid heating is difficult, so that it is not suitable as a quick heater.

Further, the heat storage type heater has a problem that if it is left for a long time after heat storage, it radiates heat and the amount of heat storage decreases.

Then, paying attention to the above-mentioned problems, the application has not been published yet, but the present applicant has previously proposed a quick heater using engine exhaust heat, which uses a magnetic fluid for heat transport. There is. By this proposal, a quick heater can be realized in which the temperature rises quickly, the amount of heat transport can be easily increased, and the degree of freedom in design is high.

[Problems to be Solved by the Invention] In order to further improve the performance of the above-proposed quick heater of the type using magnetic fluid for heat transport,
In particular, the purpose is to increase the efficiency on the heat absorption side, that is, on the side that transfers heat from the engine exhaust path to the magnetic fluid.

[Means for Solving Problems] A quick heater according to the present invention for this purpose includes a heat exchange means for absorbing heat provided in an exhaust gas passage from an engine and a heat dissipation means provided in an air passage leading to a vehicle compartment. A heat exchanger, a magnetic fluid circulation path that connects between the heat absorption heat exchange means and the heat dissipation heat exchanger and is formed substantially in a closed loop, a magnetic fluid that circulates in the magnetic fluid circulation path, and a magnetic fluid circulation path. A quick heater comprising: a magnetic field generation unit that is provided along a path and that generates a magnetic field that can drive a magnetic fluid in the path; and a control device that is connected to the magnetic field generation unit and controls the unit. The heat exchange means for absorbing heat comprises means for exchanging heat between the magnetic fluid and the engine cooling water flowing in the water cooling jacket of the exhaust manifold.

Here, the heat exchange means for heat absorption, while directly mixing the magnetic fluid and the engine cooling water in the water cooling jacket,
A means for separating the magnetic fluid from the engine cooling water after mixing or a heat exchanger for exchanging heat between the magnetic fluid circulation passage and the engine cooling water passage is a separate passage.

[Operation] In such a quick heater, the temperature of the magnetic fluid circulated in the magnetic fluid circulation path is increased by exchanging heat with the engine cooling water in the exhaust manifold on the side of the heat absorbing heat exchanging means. The heat is transported along with the circulation of the magnetic fluid, and the heat is exchanged with the air for air conditioning by the heat exchanger for heat radiation. The exhaust manifold part is the part that is warmed up most quickly after the engine is started, and since efficient heat exchange is performed between the engine cooling water and the magnetic fluid in that part, the circulating magnetic fluid is short. It can be heated effectively in time, enabling efficient rapid heating.

[Embodiment] A preferred embodiment of the present invention will be described below with reference to the drawings.

First Embodiment FIG. 1 shows the overall structure of a quick heater and its peripheral equipment according to a first embodiment of the present invention, and FIG. 2 shows the vicinity of an exhaust manifold portion in an enlarged manner. In the figure, 1 is an engine body, 2 is an exhaust manifold, and 3 is an engine including an exhaust manifold.
It shows the path of the exhaust gas emitted from the. Reference numeral 4 is an air-conditioning air path leading to the passenger compartment. The air in the air path 4 is warmed by a heat exchanger 5 using normal engine cooling water, and the warmed air is guided into the passenger compartment. Heating is done.

The exhaust manifold 2 is of a water cooling type having a water cooling jacket 6, and engine cooling water is introduced into the water cooling jacket 6 through an introduction pipe 7 and discharged through a discharge pipe 8. The pipes 7 and 8 are provided with open / close valves 9 and 10, respectively. The exhaust manifold 2 is connected to a magnetic fluid inlet 11 that opens into the water cooling jacket 6 and a separator 12 that separates the engine cooling water that has passed through the water cooling jacket 6 from the magnetic fluid. A series of devices constitutes endothermic heat exchange means 13 for exchanging heat between the engine cooling water and the magnetic fluid. In the separation device 12, a coil 15 that generates a magnetic field that moves the magnetic fluid 14 to the bottom surface side of the separation device, and a coil 17 that generates a magnetic field that moves the magnetic fluid in the separation device into the magnetic fluid circulation path 16. Is provided. Air conditioning air path 4
Inside is provided a heat exchanger 18 for radiating heat that exchanges heat between the air in the path and the magnetic fluid. The heat exchanger 18 and the heat exchanging heat exchanging means 13 described above are connected by a magnetic fluid circulation passage 16 formed of a pipe, which is substantially configured in a closed loop, and the magnetic fluid 14 in the passage is connected to the passage. It is possible to circulate between the heat exchange means 13 and the heat exchanger 18 along. The magnetic fluid 14 is stored in a tank 19 which communicates with the pipe 16, and is circulated in a required amount as needed.

An appropriate number of coils 20 as magnetic field generating means for generating a magnetic field are disposed along the magnetic fluid circulation path 16 in the path. When an electric current flows through coil 20, magnetic fluid 14
Is attracted (adsorbed), and when a current then flows to the adjacent coil 20, the magnetic fluid 14 is attracted to the next position, and the magnetic fluid 14 can be driven by continuing this operation. Therefore, the coil 20 need only be provided at a position necessary for driving the magnetic fluid 14, and need not be provided at a position where the magnetic fluid 14 falls in the path due to gravity. A tank coil 21 is provided in the tank 19 portion, and the magnetic fluid 14 is taken in and out of the tank 19 by the coil 21.

Power supply to the coils 15, 17, 20, and 21 is controlled by a control computer 22 as a control device and a relay 23 that is an output control unit. Reference numeral 24 is a power supply device for the coil, which is connected to the relay 23. Reference numerals 25, 26, and 27 are sensors and the like that provide the computer 22 with information such as room temperature, exhaust manifold temperature, and outside temperature.

The magnetic fluid 14 used in the above device usually has a specific gravity of 1.1.
It is about 1.5 and heavier than water. Although there are many types of magnetic fluid 14, most of them are oil-based magnetic fluids (kerosene, silicone oil, synthetic oil, etc.) and are not in a pure mixed state with water. That is, it becomes suspended,
Separates from water if left unattended. By applying a magnetic field to this suspension, it is possible to instantly separate it into magnetic fluid and water.

The operation of the embodiment apparatus configured as described above will be described.

First, regarding the heat exchange means 13 for absorbing heat, the magnetic fluid is placed in the water cooling jacket 6 of the exhaust manifold 2.
14 is injected from the inlet 11. The magnetic fluid 14 mixed with the engine cooling water in the water cooling jacket 6 is conducted into the separating device 12 by the force of gravity or magnetic field. Magnetic fluid 14
Is sunk in the lower part of the separating device 12 by the coil 15, and then the coil 15 is cut and an electric current is passed through the coil 17 to move only the magnetic fluid 14 in the pipe 16 by the force of the magnetic field to separate it from the engine cooling water. To be done.

Immediately after the engine is started (when it is cold), the valves 9 and 10 are closed and the engine cooling water is not circulated. Therefore, the exhaust manifold 2 quickly becomes hot. Magnetic fluid tank
The magnetic fluid 14 discharged from 19 is coiled in the pipe 16.
Inlet at exhaust manifold moved by 20 11
It enters the water cooling jacket 6 more and heat-exchanges while suspending with water. The magnetic fluid 14 guided to the separation device 12 is separated from water by the coil 15, and the separated magnetic fluid 14 is sucked and moved into the pipe 16 by the coil 17 and passes through the indoor air conditioning heat exchanger 18 to generate heat from the indoor air and heat. Replace it to become a quick heater.

When the room temperature rises and the need for the quick heater is eliminated, the magnetic fluid 14 is returned to the tank 19, and the engine cooling water is circulated in the exhaust manifold 2 by opening the valves 9 and 10.

Second Embodiment Next, FIG. 3 shows a second embodiment of the present invention. In this embodiment, the heat exchanger 31 for heat absorption uses a heat exchanger 31 in which the circulation passage of the magnetic fluid and the water passage of the engine cooling water are completely separate passages and heat is exchanged between the passages.

If a quick heater is required after engine start, valve 32,
33 is switched, and the engine cooling water is circulated only in the exhaust manifold 35 by the pump 34. The heat exchanger 31 exchanges heat between the engine cooling water and the magnetic fluid 14 that have been efficiently heated. Valve 32 when quick heater is not needed,
Turn 33 toward the engine radiator to circulate engine cooling water for cooling. Further, when high temperature exhaust gas is required by the catalytic converter, the valve 33 is closed and the valve 32 is opened to remove the cooling water in the exhaust manifold 35 and to raise the temperature of the exhaust gas. Since other configurations and actions are similar to those of the first embodiment, the same parts as those in the first embodiment are designated by the same reference numerals as those in FIG.
The description is omitted.

[Effects of the Invention] As described above, according to the quick heater of the present invention, the heat quantity of the exhaust system can be transported to the air conditioning system by using the magnetic fluid, and the heat absorption to the magnetic fluid is absorbed by the exhaust manifold. Since it was made to perform efficiently by heat exchange with the engine cooling water, it is possible to realize highly efficient heat exchange between fluids, speed up the heating rate of the magnetic fluid, and improve the rapid heating performance during cold start. The effect that it can raise is acquired.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a quick heater and its peripheral equipment according to a first embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of the exhaust manifold peripheral portion of the apparatus of FIG. 1, and FIG. FIG. 6 is a schematic configuration diagram of a quick heater and its peripheral devices according to a second embodiment. 1 ...... Engine 2, 35 ...... Exhaust manifold 3 ...... Exhaust gas path 4 ...... Air path 6 ...... Water cooling jacket 7 ...... Introduction pipe 8 ...... Discharge pipe 9, 10, 32, 33 ...... Open / close valve 11 ... … Inlet 12 …… Separator 13,31 …… Heat absorption heat exchange means 14 …… Magnetic fluid 15,17 …… Coil 16 …… Magnetic fluid circulation path 18 …… Heat dissipation heat exchanger 19 …… Tank 20… … Coil as magnetic field generating means 21 …… Tank coil 22 …… Computer 23 …… Relay 34 …… Pump

Claims (3)

[Claims] 1. An endothermic heat exchange means provided in an exhaust gas path from an engine, a heat dissipation heat exchanger provided in an air path leading to a passenger compartment, the endothermic heat exchange means and the heat dissipation heat exchange. A magnetic fluid circulation path that connects devices and is formed in a substantially closed loop, a magnetic fluid that circulates in the magnetic fluid circulation path, and a magnetic fluid that is provided along the magnetic fluid circulation path and that drives the magnetic fluid in the path. A quick heater comprising: a magnetic field generating means for generating a possible magnetic field; and a control device connected to the magnetic field generating means for controlling the magnetic field generating means, wherein the endothermic heat exchange means is the magnetic fluid and the exhaust manifold. A quick heater comprising means for exchanging heat with the engine cooling water flowing in the water cooling jacket. 2. The heat exchanging heat exchange means comprises means for directly mixing the magnetic fluid with the engine cooling water in the water cooling jacket, and for separating the magnetic fluid from the engine cooling water after mixing. The quick heater according to item 1. 3. The heat absorbing heat exchange means comprises a heat exchanger for exchanging heat between the magnetic fluid circulation passage and the engine cooling water passage, which are separate passages. The quick heater according to item 1.