JPS63284016A - Airconditioner for automobile - Google Patents

Abstract

PURPOSE:To prevent abnormal rise of the temperature inside a cabin during parking by actuating a damper device with an actuating member consisting of shape memory alloy, when the temperature in the cabin has exceeded a certain level, so as to put an air passage in communication with an exhaust passage, and by putting a ventilator fan in operation. CONSTITUTION:This airconditioner includes a damper device which is equipped with dampers 18, 19 to open and close so that air is passed selectively to either an exhaust passage 4 or a heater unit 11. Here one end of an arm 23 to couple arms 27, 29 fixed to these dampers 18, 19 is coupled with one end of an actuat ing member 20 consisting of shape memory alloy, and the other end coupled with the heater unit 11. When the atmospheric temperature has exceeded a certain level, the actuating member 20 is elongated, and the dampers 18, 19 are rotated to respective positions indicated by assumed lines. This allows air to be passed to the exhaust passage 4 and a switch interlocked with the damper 18 to be turned on to cause driving of a ventilator fan 12 with a solar cell.

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention provides a forced ventilation system for suppressing the upper limit of the temperature inside the vehicle when the vehicle is parked in a place exposed to direct sunlight during sunny weather in summer, for example. Related to air conditioners for automobiles.

(Prior art) To solve the problem that when a vehicle is parked, the temperature inside the vehicle becomes high due to strong sunlight, and when the vehicle is re-boarded, the temperature inside the vehicle does not easily drop to a comfortable temperature even when the air conditioner starts cooling the vehicle. For this reason, it has been known for a long time to use solar cells to drive ventilation fans even when the vehicle is parked. In this conventional ventilation system, when the vehicle is parked, air inside the vehicle is exhausted to the outside by a ventilation fan in an exhaust passage that communicates the interior of the vehicle with the outside of the vehicle.This ventilation fan is specially controlled. This is done using a temperature sensor and a control circuit.

(Problem to be solved by the invention) ゛In the conventional technology, thick g! A complex control circuit is used for the i and IJ 10 battery-powered ventilation fans, and it is also conceivable that an electric motor or negative pressure motor may be used to switch the damper for the exhaust passage that communicates the inside and outside of the passenger compartment. However, in that case, the structure becomes complicated. Therefore, in the conventional technology, the production cost must be extremely high.

(Means for Solving the Problem) The present invention provides an inside air inlet, an outside air inlet, and an inside/outside air switching damper that can be selectively operated to open one of the inside air inlet and the outside air inlet and close the other. , a blower disposed downstream of the internal/external air switching damper, a heater unit disposed downstream of the blower, an air passage between the blower 8i1 unit and the heater unit, and the outside of the vehicle compartment. selectively switching to communicate one of the exhaust passage and the heater unit with the air passage and open the other; an actuable damper device, and a damper device connected to the damper device when the vehicle interior temperature rises above a predetermined value, the damper device is actuated to communicate the discharge passage with the air passage, and the heater unit is activated. an actuating member made of a shape memory alloy, a first switch that is closed when the outside air switching damper closes the outside air intake port, and the exhaust passage communicating with the air passage. a second switch that is closed when the damper device is activated; a solar cell; an electric circuit in which the solar cell, the first and second switches described in iyJ, and the motor of the ventilation fan are connected in series; It is characterized by having the following.

(Function) If the vehicle is parked with the outside air intake port closed and the first switch closed, when the temperature inside the vehicle rises above a predetermined value, the operating member will operate the damper device to open the exhaust passage. Since the second switch is closed at the same time as the communication with the air passage, the ventilation fan is operated to suck in air from the interior of the vehicle through the inside air suction port, discharge it from the exhaust passage, and release hot air to the outside of the vehicle.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

Fig. 1 is an explanatory diagram showing an overview of an automotive air conditioner that is an embodiment of the present invention, Fig. 2 is an explanatory diagram showing details of a damper device, and Fig. 3 is an explanatory diagram showing the damper device and a coil made of a shape memory alloy. Figure 4 is a diagram explaining the operation B of the internal/external air switching damper, Figure 5 is an electric circuit diagram showing the connection between the ventilation fan motor and the solar cell, and Figure 6 is the shape. FIG. 3 is a diagram showing two states of a coil made of a memory alloy.

First, with reference to FIG. 1, the automotive air conditioner 40 includes:
It has an inside air suction port 5 that communicates with the interior of the vehicle, and an outside air suction port 6 that communicates with the exterior of the vehicle. Inside air intake port 5 and outside air intake port 6
An internal/external air switching damper 13 is provided which can be selectively operated in the direction of arrow M13 to open one side and close the other side, and this internal/external air switching damper 13 is used when the automobile air conditioner 40 is in normal operation. When the vehicle interior is heated and cooled, the outside air intake port 6 is generally closed.

A fan 11 is disposed downstream of the internal/external air switching damper 13, and a cooler unit 1o and a heater unit 11 are sequentially disposed downstream thereof. The cooler unit 10 has a refrigerant evaporator 2, and the heater unit 11 has a heater core 3 through which engine cooling water circulates, an amount of air passing through the heater core 3, and a desired amount M of air passing through a cold air bypass 11a on the side of the heater core 3. A pair of air mix dampers 14.14a are provided to achieve a ratio of . The air mix dampers 14 and 14a are respectively indicated by the arrow M14. It is operable in the direction of M14a. The downstream chamber of the heater unit 11 is equipped with a defroster outlet lower, a vent outlet 8, and a heater outlet 9, and these outlet lowers 8.9 each have a defroster damper 15, a vent damper 16, and a heat damper 17. The dampers are respectively indicated by arrow M15.
It can be opened and closed in the directions M16 and M17, so that air at a desired temperature can be blown out from a desired outlet. A discharge passage 4 that communicates the air passage 32 between the evaporator 2 and the heater core 3 with the outside air suction port 6.
A ventilation fan 12 is disposed within the exhaust passage 4. A damper device consisting of a bypass damper 18 and a sub-damper 19 that opens and closes so as to selectively allow air to pass only to either one of the discharge passage 4 and the heater unit 11 is provided, as indicated by the arrow M18. It can operate in the direction indicated by M19.

Referring to FIG. 2, details of this damper device are shown. The bypass damper 18 is fixed to a shaft 33 fixed to one end of the first arm 27, and therefore the bypass damper 18, the first arm 27, and the shaft 33 rotate integrally around the axis of the shaft 33. It is possible. The sub-damper 19 is fixed to a shaft 31 fixed to one end of the second arm 29,
Therefore, the sub-damper 19, the second arm 29, and the shaft 31 can rotate integrally around the axis of the shaft 31.

A long hole 25 is formed in a portion near the other end of the first arm 27, and a bottle 26 provided near one end of the third arm 23 is freely inserted into this long hole 25. There is. A portion of the third arm 23 near the other end (the end opposite to the end to which the bin 26 is attached) is rotatably attached to the heater unit 11 by a shaft 24 . The third arm 23 has a finger portion 23a protruding from near the shaft 24, and the tip of this finger portion and the other end of the second arm 29 are pivotally connected to one end 34 and the other end 30 of the connecting rod 28, respectively. has been done. As shown in FIG. 3, a locking pin 21 is implanted at the other end of the third arm 23, and the locking pin 21 is made of, for example, a three-component shape memory alloy of Cu-zn-AI. One end of the coil-shaped actuating member 20 is connected. The other end 22 of this actuating member 20 is fixed at a proper position of the heater outlets 1 to 11. Coiled actuating member 2 made of shape memory alloy
As shown in FIG. 6, 0 has the characteristic that it expands to state (2) when the hot water temperature reaches a predetermined temperature (for example, 50° C.) or higher, and contracts to state (c) at a temperature lower than that. Accordingly, when the actuating member 20 is extended in FIG. Bypass damper 1 is rotated counterclockwise as
8 in a counterclockwise direction from the position shown by the solid line in FIG. 2 to the position shown by the dashed line. At the same time, the connecting rod 28 rotates the second arm 29 clockwise about the axis of the shaft 31, and rotates the sub-damper 19 clockwise from the position shown by the solid line in FIG. 2 to the position shown by the dashed line. make it move.

The switch (second switch) 36 that closes when the bypass damper 18 is rotated to the chain line position in FIG. 2, and the inside/outside air switching damper 13 in FIG. 1 are in the position shown by the solid line in FIG. 4. A switch (first switch) 35 that closes when the switch is rotated is provided. A solar cell 37 (FIG. 5) is placed at a suitable location on the outside of the vehicle. This thick 1i1ffl pond 37 and the first and second switches 35
．． 36 and the ventilation fan motor 12 are connected in series through a third switch, the main switch 38, as shown in the electrical circuit of FIG.
is closed, the first and second switches 35, 36
When both are closed by the dampers 13 and 18, the motor 12a of the ventilation fan 12 is automatically activated.

The automotive air conditioner 40 of the present invention operates as follows. First, when normally operating the air conditioner fi'ff 40, the inside/outside air switching damper 13 is positioned at the position shown by the solid line or line II in FIGS. It is sent into the device through the port 5 by the blower 1. Under normal conditions, the temperature inside the vehicle is below a predetermined temperature limit (for example, 50°C), so the coiled actuating member 20 made of a shape memory alloy is contracted to the state shown in (c) in Figure 6. . Therefore, the bypass damper 18 and the sub-damper 19 are at the positions shown by solid lines in FIG. 2, and the discharge passage 4 is closed to the air passage 32.

If the cooler unit 1o and the heater unit 11 are operated in this state, the desired temperature determined by the opening degree of the air mix dampers 14, 14a can be achieved from the defroster blowout lower, vent blowout port 8, or heater blowout port 9, which are opened as desired. Air is blown out. The temperature of the blown air is controlled by adjusting the opening degree of the air mix damper 14.14a.

The above is the normal operation of the automobile air conditioner 40, and is no different from that in the prior art.

- Next, we will explain the operation of the automotive air conditioner 40 of the present invention when the vehicle is left parked under the hot sun such as in summer and the driver is away from the vehicle. At this time, the driver closes the main switch 38 which is the third switch, rotates the inside/outside air switching damper 13 to the position shown by the solid line in FIGS. 1 and 4, opens the inside air intake port 5, and The outside air suction port 6 is kept closed to the blower 1. At this time, the first switch 35 is operated by the inside/outside air switching damper 13 and closed, as shown in FIG. In this state, if the temperature inside the vehicle reaches a predetermined temperature (for example, 50 degrees Celsius) or higher,
A coiled actuating member 20 made of a shape memory alloy is shown in FIG.
2), and as described above, the bypass damper 18 and the sub-damper 19 are rotated to the positions shown by the dashed lines in FIG. The discharge passage 4 is brought into communication with the passage 32. At this time, the second switch 36 is actuated and closed by the bypass damper 18, and thus the solar cell 37 is connected to the ventilation fan motor 12.
The ventilation fan 12 is driven by the current flowing to a. The ventilation fan 12 moves the high-temperature air inside the vehicle from the inside air intake port 5 to the air passage 32, as shown by the arrow (F) in FIG.
The air then passes through the exhaust passage 4 and is discharged from the outside air intake port 6 to the outside of the vehicle. When the temperature in the vehicle compartment falls below a predetermined value, the coiled actuating member 2o made of a shape memory alloy contracts to the state shown in FIG. Therefore, the exhaust passage 4 is closed and the air passage 32 and the cold air bypass 11 are closed.
At the same time, the second switch 36 is also turned on and the ventilation fan motor 12a is stopped.

In the embodiment described above, the blower 1 and the heater unit 11
Although the cooler unit 1o is disposed between the cooler unit 10, the present invention can also be implemented in an air conditioner that does not include the cooler unit 10. In addition, the outer end of the discharge passage 4 is connected to the outside air suction port 6.
Although an example is shown in which the opening is connected to the opening, the effect remains the same even if the opening is opened at a different location. Furthermore, although the coil-shaped actuating member 20 is illustrated, it is also possible to use a shape other than a coil.

(Effects of the Invention) According to the present invention, since the damper device is operated based on the temperature in the vehicle interior using the actuating part made of a shape memory alloy, it is not necessary to install the Katamaro senna or the like. To easily configure a means for eliminating a rise in temperature inside a vehicle during parking at low cost without requiring a complicated control circuit.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing an overview of an automotive air conditioner that is an embodiment of the present invention, Fig. 2 is an explanatory diagram showing details of a damper device, and Fig. 3 is an operation diagram showing a damper device and a shape memory alloy. Figure 4 is a diagram showing the switching operation of the internal/external air switching damper, and Figure 5 is a partial perspective view showing the connections between the components, and Figure 5 shows the connections between the ventilation fan motor, solar cells, and the first to third switches. The electric circuit diagram shown in FIG. 6 (■) and (C) are diagrams respectively showing an extended state and a contracted state of the actuating member made of a shape memory alloy. DESCRIPTION OF SYMBOLS 1... Blower, 2... Evaporator, 3... Heater core, 4... Discharge passage, 5... Inside air suction port, 6... Outside air suction port, 7... Defroster outlet, 8... Vent outlet, 9... Heater outlet, 10... Cooler unit, 11... Heater unit, 12... Ventilation fan, 12a... Same motor, 13... Inside and outside air switching damper, 14... air mix damper, 15... defroster damper, 16... vent damper, 17... heat damper, 18... bypass damper, 19...
Sub-damper, 2o... Operating member made of shape memory alloy, 21... Locking pin, 23... Third arm, 27
... first arm, 28 ... connecting rod, 29 ... second arm, 32 ... air passage, 35 ... first switch, 36 ... second switch, 37 ...Solar cell, 38...Main switch (third switch), 4
0...Automotive air conditioner.

Claims (1)

[Claims] an inside air suction port, an outside air suction port, an inside/outside air switching damper that can be selectively operated to open one of the inside air suction port and the outside air suction port and close the other; and an outside air switching damper disposed downstream of the inside/outside air switching damper. A blower, a heater unit disposed downstream of the blower, a discharge passage communicating an air passage between the blower and the heater unit with the outside of the vehicle compartment, and a ventilation passage disposed within the discharge passage. a fan, a damper device that is selectively operable to communicate one of the exhaust passage and the heater unit with the air passage and close the other; an actuating member made of a shape memory alloy that operates the damper device to communicate the exhaust passage with the air passage and close the heater unit when the temperature rises to a predetermined value or more; a first switch that is closed when the suction port is closed; a second switch that is closed when the damper device is operated so that the exhaust passage communicates with the air passage; and a solar cell. , an electric circuit in which the solar cell, the first and second switches, and the motor of the ventilation fan are connected in series.