JP2629675B2 - Heat storage heating system for vehicles - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a regenerative heating device for a vehicle using a heat storage medium, and particularly to auxiliary heating when the temperature of a vehicle engine cooling water is low.
It is effective for immediate heating.

[Conventional technology]

Conventionally, as this kind of heat storage type heating device for vehicles,
As disclosed in Japanese Patent Application Publication No. 52-27139, by performing heat exchange between an engine cooling water and a heat storage medium circulating between a water jacket and a radiator of an automobile engine, the engine is still sufficiently warmed immediately after the engine is started. It is known that the engine cooling water is heated when the engine is not in use to effect immediate heating.

[Problems to be solved by the invention]

However, in the above-mentioned conventional heat storage type heating device for a vehicle, since heat is supplied to the heat storage medium and heat radiation of the heat storage medium is performed through engine cooling water, the heat is released when the heat storage medium is released. Heat is temporarily given to the engine cooling water, and the air is warmed by the engine cooling water, so that a time delay occurs before ventilation is obtained, and part of the heat is lost in the engine cooling water piping. However, there is a problem that thermal efficiency is not good.

[Means for solving the problem]

Therefore, in the present invention, in order to solve the problems described above, a ventilation duct having an air inlet at one end and an air outlet at the other end for blowing air toward the passenger compartment, A heating heat exchanger arranged in the ventilation duct to heat the air flowing through the ventilation duct by radiating the exhaust heat of the engine, and having an air intake port on one end side and a recirculation air outlet port on the other end side; An air passage casing having a vehicle air outlet for leading air into the vehicle interior; and a shunt duct for communicating a downstream position of the heating heat exchanger of the air duct with an air inlet of the air passage casing. A reflux duct that connects the ventilation duct with the ventilation air outlet of the ventilation path casing, a heat storage medium disposed inside the ventilation path casing, and an air flowing through the ventilation path casing inside the heat storage medium. A regenerative heat exchanger integrally provided with an air passage formed so as to be exchangeable; and the recirculating air via the regenerative heat exchanger through air taken in from an air intake of the ventilation path casing. A regenerative heating system for a vehicle, comprising: a blower that blows air toward an air outlet or an air outlet for a vehicle compartment; and a damper that selectively opens and closes the air outlet for reflux of the ventilation passage casing and the air outlet for the vehicle interior. The device is adopted.

[Action]

According to the above means, since the heat storage medium of the heat storage type heat exchanger can be radiated to directly exchange heat with the ventilation air, there is no loss of generated heat and no time delay in heating the conditioned air.

〔The invention's effect〕

Therefore, according to the present invention, there is obtained a practical effect that a heat storage type heating device for a vehicle having higher thermal efficiency and excellent immediate effect can be provided.

〔Example〕

Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. FIG. 1 is a system diagram showing the configuration of a regenerative heating device for a vehicle according to the present invention, in which A is an air conditioner whose ventilation system is housed in an instrument panel section in front of a normal automobile driver's seat, and B is an air conditioner of the present invention It is a regenerative heating device for vehicles. As shown in FIG. 2, the regenerative heating device is mounted below the air conditioning control panel D at the lower center of the vehicle instrument panel C.

The air conditioner A is a blower fan driven by a drive motor 19a in a ventilation duct 4 having an inside / outside air switching box (not shown) at an inlet end and a heat outlet 1, a ventilation outlet 2, and a defrost outlet 3 at an outlet end. 19, a cooling evaporator 5, a heating heater core 6, an air mix damper 7, and an outlet switching damper group 8 are housed therein.
Engine cooling water is guided to the heater core 6 from a not-shown automobile engine water jacket by a metal pipe.

Next, the configuration of the regenerative heating device B of the present invention is shown in detail in the sectional views of FIGS. 3 (a) and 3 (b) and the side view thereof. Reference numeral 10 denotes a resin casing, which includes an air suction unit 10a, a heat exchange unit 10b, and an air blowing unit 10c. Air suction section
10a is provided with a fan 12 driven by a drive motor 12a fixed to the outside of the casing 10.On the casing 10 on the side opposite to the drive motor 12a, the center axis of the fan 12 is matched with the fan 12. A circular air inlet 10d is provided. The heat exchange section 10b includes a regenerative heat exchanger 13 of the present invention.
Are fixed to the casing 10 via the mounting bracket 14. The air outlet 10c is provided with a recirculation outlet 10e and a vehicle interior air outlet 10f, which are the air outlets of the present invention, and each of the outlets is provided with an opening / closing damper 15,16. And the vehicle interior air outlet 10f continues to the outlet chamber 10g, and from this outlet chamber 10g, an outlet 10h having a louver,
After 10i, warm air is blown toward the feet of the occupants in the passenger compartment. On the other hand, as shown in FIG. 1, a recirculation outlet 10e is a bellows-shaped flexible duct 17 made of resin and provided on a ventilation duct 4 provided on the upstream side of the heater core 6 of the vehicle air passage unit A. The air inlet 10d is connected to the air inlet 10d with a resin duct 18 similar to the air inlet 4d so as to be airtight with the air hole 4b provided on the airflow duct 4 downstream of the heater core 6. ing.

In the present invention, the regenerative heating device B is provided separately from the automotive air conditioner A, and is connected by a duct having the above-mentioned flexibility, and a metal engine cooling water flow pipe is provided. Since there is no connection, there is an advantage that the degree of freedom in the mounting position is increased and the number of mounting steps is significantly reduced.

Next, the structure of the regenerative heat exchanger 13 will be described with reference to FIGS. FIG. 4 is a perspective view showing the entire configuration of the regenerative heat exchanger 13, and a partition wall is provided except for the surface 13a and the opposite surface which does not appear in the drawing so that the wind passes in the direction of the double arrow (a). It is covered with. The internal structure has a size substantially equal to the 13b surface filled with sodium acetate hydrate (CH ₃ COONa · nH ₂ O; n = 2.5 to 4.0), which is the heat storage medium of the present invention, as shown in the partially enlarged view of FIG. Aluminum flat tubes 21 are laminated at regular intervals, and are formed in a meandering shape so as to promote the thermal sensation of the heat storage medium 20 and the passing air in the space 22 which becomes the ventilation path formed by this. The finished aluminum fins 23 are interposed on the entire surface and brazed to the flat tube 21. Next, the heat storage principle of sodium acetate hydrate, which is the heat storage medium of the present invention, will be described. Sodium acetate hydrate (CH ₃ COONa · nH ₂ O; n = 2.5 to 4.0) absorbs heat and reaches 58 ° C. It becomes gel-like, and the completely gel-like one does not crystallize (transition to a less hydrated phase) even if the temperature is lowered (below 58 ° C), ) (Supercooled state). When the heat is to be released, the supercooled state collapses at once by applying a mechanical stimulus or the like, and the state changes from the gel state to the crystalline state. At this time, the calorie of 40 to 60 cau / g is released.

Numeral 24 denotes a heat radiation starting device for applying a mechanical stimulus to the heat storage medium 20, and details thereof are shown in FIG. Here, each flat tube
The connecting pipes 21 are all connected as shown in FIG. 6 by connecting pipes 25 provided at one end of the heat exchanger 13, and a heat radiation starting device 24 is provided at the center of the connecting pipe 25.

On the wall surface of the connection pipe 25, a space 26 is provided via a partition wall 25b having small holes 25a of such an extent that the liquid surface is retained by the surface force even when the sodium acetate hydrate is in a gel state,
In this space, a permanent magnet 27 is pressed by a spring 28 toward a wall surface 26b of a space 26 opposite to the partition wall 25. The permanent magnet 27 is provided with a needle 29 having a sharp tip toward the small hole 25a.

An exciting coil 30 is provided outside the space 26 facing the wall surface 26b, and when the exciting coil 30 is energized, the permanent magnet 27 is moved to the left in FIG. 6 against the urging force of the spring 28. It is configured to generate a moving magnetism. When the permanent magnet 27 moves to the left, the tip of the needle 29 is
It can be inserted into and contact the thermal storage medium to provide mechanical stimulation to the sodium acetate hydrate in the gel state.

Next, the control circuit of the regenerative heating device of the present invention
Description will be made based on the drawings. A thermistor 40 for detecting the temperature of the air downstream of the heater core 6 is provided downstream of the heater core 6 of the air conditioner A, and a thermistor 41 for detecting the temperature downstream of the heat exchanger is provided downstream of the heat storage exchanger 13. The signal is input to the microcomputer 42. The microcomputer 42 is connected to a battery 44 via a blower switch 43 provided on a control panel C of the vehicle air conditioner. Then, under the control of the microcomputer 42, the heat radiation starting device 24 of the regenerative heat exchanger 13
Excitation coil 30, servo motor 4 for opening and closing dampers 15, 16
The power supply to the drive motors 12a and 19a of the fans 5 and 46 and the fans 12 and 19 is controlled.

Next, the operation of the regenerative heating device of the present invention having the above configuration will be described. When the engine cooling water temperature is low immediately after starting the engine, the blower switch 43
(When the air volume switching mode is used, the air flow is switched to the ON position at any air volume position). When the temperature downstream of the heater core 6 detected by the thermistor 40 is 10 ° C. or less, the blower fan With the 19 stopped, the excitation coil 30 of the heat radiation starting device 24 is energized for a few seconds by a timed circuit, etc., and the permanent magnet 27 moves, and the tip of the needle 29 is inserted into the small hole 25a and the supercooled gel state is reached. The heat storage medium 20 storing the latent heat is stimulated to crystallize at once, thereby releasing the latent heat accompanying the crystallization. At the same time as the blower switch 43 is turned on, the drive motor 12a of the fan 12 is energized, and the open / close servomotor 46 of the damper 16 is energized to open the damper 16 (the position in FIG. 1B). At this time, when the dam 15 is closed (the position of FIG. 1A), the wind flows as shown by the solid arrow in FIG. 1 and the latent heat is received by the heat exchanger 13, and the outlets 10h and 10i at the feet of the occupant are provided. It is blown out as warm air.

Next, about 5 to 10 minutes after the engine is started, the engine cooling water is warmed, and when the temperature downstream of the heater core 6 detected by the thermistor 40 becomes higher than the temperature downstream of the regenerative heat exchanger 13 detected by the thermistor 41, Microcomputer 42
Drive the servo motors 45 and 46 to open the damper 15, close the damper 16, and drive the blower fan 19.
Then, the interior of the vehicle is heated by the air conditioner A using the normal engine cooling water as a heat source, and at the same time, the warm air heated by the heater core 6 flows through the regenerative heating device as shown by a broken line arrow in FIG. Heat is supplied to the heat storage medium 20 at the time of passing through the heat storage type heat exchanger 13, and sodium acetate hydrate as the heat storage medium
When the temperature exceeds ℃, it melts and becomes gel-like. After a lapse of sufficient time (about 20 minutes) to completely melt the entire sodium acetate hydrate, the power to the drive motor 12a of the fan 12 is turned off by a signal from the microcomputer 42.
In this way, the engine is stopped when the sodium acetate hydrate is completely melted, and the sodium acetate hydrate does not crystallize even when the temperature of the regenerative heat exchanger 13 becomes 58 ° C or less, and is maintained in a supercooled gel state. Then, heat is stored. FIG. 7 shows the relationship between the temperature of the heat storage medium and the operation progress.

Next, another embodiment of the present invention will be described. In the above embodiment, the operation of the regenerative heating device B of the present invention is configured to be started by the blower switch 43 of the air conditioner. However, the present invention is not limited to this. The regenerative heating device may be configured to operate in the heat mode and the defrost mode.

Further, in the above-described embodiment, the heat radiation starting device 24 uses a method of contacting a sharp metal piece, but in addition, mechanical vibration using a piezoelectric element or microcrystals of sodium acetate are held at the tip. The crystallization may be induced by moving the working rod and bringing the microcrystals into contact with sodium acetate in a gel state.

Further, the heat storage medium 20 of the present invention is limited to sodium acetate hydrate, and a substance that undergoes a phase transition between the gel phase and the crystal phase with the absorption and release of water of crystallization with the absorption and release of water of crystallization is used. And hydrates of inorganic salts such as sodium thiosulfate and calcium chloride.

Further, the heat storage medium of the regenerative heating device of the present invention may be high-temperature engine cooling water itself, which is stored in a separately provided insulated container. You may comprise so that it may circulate in a type heat exchanger.

As shown in FIG. 8, in the regenerative heating device of the present invention, the recirculation air outlet 10e and the vehicle interior air outlet 10f are connected by one.
It may be configured so that it can be opened and closed with a single damper 50, and this will result in a simpler structure.

Further, as shown in the figure, an air outlet of the vehicle interior and a ventilation hole 4c provided on the downstream side of the heater core 6 of the air conditioner A are connected to each other by one.
The air conditioner may be configured such that the air outlets (heat air outlet 1, ventilation air outlet 2, defrost air outlet 3) of a normal air conditioner are connected by connecting them through the same duct 51 as in the cases 7 and 18.

The regenerative heating device B of the present invention can be attached to various places in the passenger compartment such as below the instrument panel C on the passenger seat side of the vehicle.

Further, in the above embodiment, heat is supplied to the heat storage medium 20, and when the heat is regenerated, the duct 17
To return to the upstream of the heater core 6, but it is not always necessary to recirculate the air,
You may make it blow out from 10f. This eliminates the need for the damper 15, the duct 17, and the servo motor 45 for opening and closing the damper 15.

The heat storage type heat exchanger in the present invention may have a structure in which a number of ventilation pipes are passed through a container storing the heat storage medium, in addition to the structure in which the flat tubes filled with the heat storage medium are stacked as in the above embodiment. Alternatively, on the other hand, the heat storage medium may be filled in a container serving as an air passage, and a pipe bent in a meandering shape may be provided.

FIG. 9 shows still another embodiment in which the embodiment shown in FIG. 8 is modified. The outlet side end of the duct 51 in FIG. 8 is connected to the ventilation hole 3a provided in the ventilation passage of the defrost outlet 3. And
The vent hole 3a and the ventilation path inlet 3b of the defrost outlet 3 are selectively opened and closed by a damper 52.

This embodiment has a feature that ice attached to a vehicle windshield can be immediately melted in cold weather.
When defrosting the vehicle windshield during cold weather,
While operating the dampers 50 and 52 respectively at the solid line position,
When the dampers 7 and 8 are operated to the dashed line positions and the fans 12 and 19 are operated, air is blown in a path of arrows a → b → c → d → e → f → g, and heat is stored in the heat storage type heat exchanger 13. The air is heated by the latent heat release of the medium 20 to become hot air, and all the hot air is blown out from the defrost outlet 3 toward the vehicle windshield (not shown) to quickly defrost the windshield. be able to. If the temperature of the engine coolant rises and the temperature of the heater core 6 rises, all the heat released here can also be given to the air blown out from the defrost blow-out port 3. In the above operation mode, since the air blown by the fan 19 does not blow out from the ventilation outlet 2 or the heater outlet 1, the fan 12 may be stopped and only the fan 19 may be operated.

On the other hand, when heat is stored in the heat storage medium 20 (during regeneration),
By operating the damper 50 to the broken line position and operating the fan 12, air is blown along the path of arrows a → b → c → h → i, and the hot air after passing through the heater core 6 is circulated to the regenerative heat exchanger 13. .

[Brief description of the drawings]

The drawings are all for explaining the embodiments of the present invention,
FIG. 1 is a ventilation system diagram of an air conditioner A for a vehicle including a regenerative heating device B of the present invention. FIG. 2 is a front view of an automobile instrument panel panel showing a state where the regenerative heating device B is mounted. 3 (a) and 3 (b) are a cross-sectional view and a side view for explaining the structure of the apparatus B, FIG. 4 is a perspective view showing the shape of the regenerative heat exchanger 13, and FIG. FIG. 6 is an enlarged sectional view showing the structure of the heat radiation starting device 24,
FIG. 7 is a characteristic diagram for explaining the operation of the heat storage medium 20, and FIGS. 8 and 9 are ventilation system diagrams showing another embodiment of the present invention. 10 …… Casing, 10d …… Air intake, 10e …… Reflux air outlet, 10f …… Car interior air outlet, 12 …… Fan, 13…
… Regenerative heat exchangers, 15, 16 …… Dampers.

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Kenzo Kaneda 1-1, Showa-cho, Kariya-shi Nippon Denso Co., Ltd. (56) References 170308 (JP, U)

Claims (1)

(57) [Claims] 1. A ventilation duct having an air inlet at one end and an air outlet at the other end for blowing air toward the interior of the vehicle, and disposed in the ventilation duct to reduce exhaust heat of the engine. A heat exchanger for heating that radiates heat to warm the air flowing through the ventilation duct; a car that has an air intake port on one end side, and a recirculation air blowout port on the other end side and air for drawing air toward the passenger compartment A casing having an air passage having a room air outlet, a branch duct for communicating a downstream position of the heat exchanger for heating the air duct with an air inlet of the casing, and a recirculating air outlet of the air passage casing. And a reflux duct that communicates the ventilation duct; and a heat storage medium disposed inside the ventilation path casing and inside,
A heat storage type exchanger integrally provided with an air passage formed so that air flowing through the ventilation path casing can exchange heat with the heat storage medium; and A blower that blows air toward the return air outlet or the passenger compartment air outlet via a heat exchanger, and selectively returns the return air outlet and the passenger compartment air outlet of the ventilation path casing. A regenerative heating device for a vehicle including a damper that opens and closes.