JPH08493B2 - Automotive air conditioners - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention includes a forced ventilation device for suppressing an increase in vehicle interior temperature when a vehicle is parked in a place exposed to direct sunlight during fine weather in summer, for example. The present invention relates to an air conditioner for an automobile.

(Prior Art) While parking a vehicle, the temperature inside the vehicle becomes high due to strong solar radiation, and even if the air conditioner starts cooling when the vehicle is re-ridden, the temperature inside the vehicle does not easily drop to a comfortable temperature. In order to solve the problem, it has been conventionally known that the ventilation fan is driven by the solar cell even during parking. This ventilation device according to the prior art is designed to exhaust the air in the vehicle interior to the outside by a ventilation fan in an exhaust passage that communicates between the vehicle interior and the vehicle exterior when parking. Is carried out by means of a special temperature sensor and a control circuit.

(Problems to be Solved by the Invention) In the prior art, a complicated control circuit is used for controlling a ventilation fan by a solar cell, and a switching operation of a damper for an exhaust passage communicating between the inside and outside of a vehicle compartment is performed. It may be possible to use an electric motor or a negative pressure motor, but in that case, the structure becomes complicated. Therefore, in the conventional technology, the production cost has to be extremely high.

(Means for Solving the Problem) The present invention is directed to an inside air intake port and an outside air intake port, and an inside air / outside air switching damper that is selectively switchable to open one of the inside air intake port and the outside air intake port and close the other. A blower arranged downstream of the inside / outside air switching damper, a heater unit arranged downstream of the blower, an air passage communicating between the blower and the heater unit and the outside of the vehicle compartment. A damper device capable of selectively switching the passage, the ventilation fan disposed in the discharge passage, and the air passage so that one of the discharge passage and the heater unit is in communication with the other and the other is closed. When the vehicle interior temperature rises above a predetermined value and is connected to the damper device, the damper device is operated to communicate the exhaust passage with the air passage and close the heater unit. An operating member made of a shape memory alloy, a first switch closed when the inside / outside air switching damper closes the outside air inlet, and the damper device so that the discharge passage communicates with the air passage. And a solar cell, and an electric circuit in which the solar cell, the first and second switches, and the motor for the ventilation fan are connected in series. Is characterized by.

(Operation) If the vehicle is parked with the outside air suction port closed and the first switch closed, the operating member operates the damper device to open the exhaust passage when the vehicle interior temperature rises above a predetermined value. Since the second switch is closed at the same time when it is communicated with the air passage, the ventilation fan operates to suck the air in the vehicle compartment from the inside air inlet and discharge it from the discharge passage to release hot air to the outside of the vehicle.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view showing an outline of an automobile air conditioner which is an embodiment of the present invention, FIG. 2 is an explanatory view showing details of a damper device, and FIG. 3 is a coil made of a damper device and a shape memory alloy. Fig. 4 is a perspective view showing the connection between the air conditioner and the outside air switching damper, Fig. 5 is an electric circuit diagram showing the connection between the ventilation fan motor and the solar cell, and Fig. 6 is a shape memory. It is a figure which shows two states of the coil which consists of alloys.

First, referring to FIG. 1, an air conditioner 40 for an automobile.
Includes an inside air intake port 5 that communicates with the vehicle interior and an outside air intake port 6 that communicates with the outside of the vehicle interior. An inside / outside air switching damper 13 that is selectively operable in the direction of arrow M13 to open one of the inside air intake port 5 and the outside air intake port 6 and close the other is provided. Air conditioner
When the normal operation of 40 is heating and cooling the passenger compartment, the outside air intake port 6 is generally closed. A fan of the blower 1 is disposed downstream of the inside / outside air switching damper 13, and a cooler unit 10 and a heater unit 11 are sequentially disposed downstream thereof. The cooler unit 10 has the refrigerant evaporator 2, and the heater unit 11 desires the heater core 3 through which the engine cooling water circulates, the amount of air passing through the heater core 3 and the amount of air passing through the cool air bypass 11a on the heater core 3 side. And a pair of air mix dampers 14 and 14a for controlling the ratio. The air dampers 14a and 14a are indicated by arrows M, respectively.
It can be operated in the direction of 14, M14a. The chamber downstream of the heater unit 11 is provided with a defroster outlet 7, a vent outlet 8 and a heater outlet 9, and these outlets 7, 8 and 9 have a defroster damper 15, a vent damper 16 and a heat damper 17, respectively. These dampers are indicated by arrows M15, M16,
It can be opened and closed in the direction of M17.
Air having a desired temperature is blown out from a desired outlet. Air passage between evaporator 2 and heater core 3
A discharge passage 4 is provided which connects 32 with the outside air suction port 6,
A ventilation fan 12 is arranged in the discharge passage 4. A damper device including a bypass damper 18 and a sub-damper 19 that opens and closes so as to selectively allow air to pass through only one of the discharge passage 4 and the heater unit 11 is provided, as indicated by arrows M18 and M19. Can be operated in any direction.

Referring to FIG. 2, details of this damper device are shown. The bypass damper 18 is fixed to the shaft 33 fixed to one end of the first arm 27, and accordingly, the bypass damper 18 is
The 18, the first arm 27, and the shaft 33 are integrally rotatable around the axis of the shaft 33. The sub damper 19 is fixed to the shaft 31 fixed to one end of the second arm 29, and accordingly, the sub damper
The 19, the second arm 29, and the shaft 31 are integrally rotatable 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 pin 26 provided near one end of the third arm 23 is movably inserted into the long hole 25. There is. A portion of the third arm 23 near the other end (the end opposite to the end where the pin 26 is attached) is rotatably attached to the heater unit 11 by a shaft 24. Third
The arm 23 has a finger portion 23a protruding from the vicinity of the shaft 24, and the tip of this finger portion and the other end of the second arm 29 are pivotally attached to one end 34 and the other end 30 of the connecting rod 28, respectively. There is. 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 Cu-Zn-Al ternary shape memory alloy. One end of the coil-shaped operating member 20 is connected. The other end 22 of this actuating member 20 is fixed in place on the heat unit 11. As shown in FIG. 6, the coil-shaped actuating member 20 made of a shape memory alloy expands to a state (a) when the temperature exceeds a predetermined temperature (for example, 50 ° C.), and contracts to a state (b) at a temperature lower than that. It has the property of Therefore, when the actuating member 20 is extended in FIG.
The third arm 23 pivots clockwise about the shaft 24, which causes the first arm 27 to pivot counterclockwise about the axis of the shaft 33 by the pin 26, thereby bypassing the bypass damper.
The 18 is rotated counterclockwise from the position shown by the solid line in FIG. 2 to the position shown by the alternate long and short dash 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 alternate long and short dash line. To move.

A switch (second switch) 36 that closes when the bypass damper 18 is rotated to the position shown by the chain line in FIG.
A switch (first switch) that closes when the inside / outside air switching damper 13 in the figure is rotated to the position shown by the solid line in FIG.
35 and are equipped. A solar cell 37 (Fig. 5) is provided at a suitable position outside the vehicle. This solar cell
37, the first and second switches 35 and 36, and the ventilation fan motor 12 are connected in series through a main switch 38, which is a third switch, as shown in the electric circuit of FIG. If the main switch 38 is closed, the motor 12a of the ventilation fan 12 is automatically driven when the first and second switches 35 and 36 are closed by the dampers 13 and 18, respectively. I'm running.

The vehicle air conditioner 40 of the present invention operates as follows. First, when the air conditioner 40 is normally operated, the inside / outside air switching damper 13 is positioned at the position shown by the solid line or the chain line in FIGS. 1 and 4, and the outside air suction port 6 or the inside air suction port 5 is used. It is sent into the device by the blower 1. In the normal state, the temperature inside the vehicle compartment is lower than a predetermined temperature (for example, 50 ° C.), so the coil-shaped actuating member 20 made of a shape memory alloy is contracted to the state shown in FIG. 6 (b). Therefore, the bypass damper 18 and the sub damper 19 are in the positions shown by the solid lines in FIG. 2, and the discharge passage 4 is closed to the air passage 32. In this state, the cooler unit 10
When the heater unit 11 is operated, air having a desired temperature determined by the opening degree of the air mix dampers 14 and 14a is blown from the defroster outlet 7, the vent outlet 8 or the heater outlet 9 which is opened as desired. It The temperature of the blown air is controlled by adjusting the openings of the air mix dampers 14 and 14a.

The above is the normal operation of the vehicle air conditioner 40, and is the same as that in the prior art.

Now, the operation of the vehicle air conditioner 40 of the present invention will be described when the vehicle is parked under the scorching sun such as in the summer and the driver is away from the vehicle. At this time, the driver closes the main switch 38, which is the third switch, and sets the inside / outside air switching damper 13 in FIGS.
The inside air suction port 5 is opened and the outside air suction port 6 is closed with respect to the blower 1 by rotating to the position indicated by the solid line in the figure. At this time, the first switch 35 is operated and closed by the inside / outside air switching damper 13 as shown in FIG.
In this state, if the temperature inside the vehicle exceeds a predetermined temperature (for example, 50 ° C.), the coil-shaped actuating member 20 made of a shape memory alloy expands to the state of FIG. 6 (a), As described above, the bypass damper 18 and the sub damper
The reference numeral 19 and the reference numeral 19 respectively rotate to positions indicated by alternate long and short dash lines in FIG. 2 to close the cold air bypass 11a on the heater core 3 side and allow the discharge passage 4 to communicate with the air passage 32. At this time, the second switch 36 is actuated by the bypass damper 18 to be closed, and thus a current flows from the solar cell 37 to the motor 12a of the ventilation fan and the ventilation fan 12a.
Is driven. Due to the ventilation fan 12, the high temperature air in the vehicle compartment is transferred to the inside air intake port 5 as shown by the arrow (F) in FIG.
Through the air passage 32 and then through the discharge passage 4 to be discharged from the outside air inlet 6 to the outside of the vehicle. If the temperature inside the vehicle is below a predetermined value, the coil-shaped operating member 20 made of a shape memory alloy is
Since the damper device including the bypass damper 18 and the sub-damper 19 is rotated to the chain line position as shown in FIG. 6B, the exhaust passage 4 is closed and the air passage 32 and the inlet of the cold air bypass 11a are opened. At the same time, the second switch 36 is also opened and the motor 12a of the ventilation fan is stopped.

In the embodiment described above, the blower 1 and the heater unit 11
Although the cooler unit 10 is disposed between the cooler unit 10 and the cooler unit 10, the present invention can be applied to an air conditioner that does not include the cooler unit 10. Further, although the example in which the outer end of the discharge passage 4 is connected to the outside air suction port 6 has been shown, the effect is not changed even if it is opened at another location. Further, the coil-shaped actuating member 20 is illustrated, but a member having a shape other than the coil can be used.

(Effects of the Invention) According to the present invention, since the damper device is operated based on the temperature inside the vehicle compartment by using the actuating member made of a shape memory alloy, it is necessary to provide the temperature sensor and the temperature sensor accordingly. A complicated control circuit is not required, and a means for eliminating an increase in vehicle interior temperature during parking can be easily configured at low cost.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an outline of an automobile air conditioner according to an embodiment of the present invention, FIG. 2 is an explanatory view showing details of a damper device, and FIG. 3 is an operation composed of a damper device and a shape memory alloy. 4 is a partial perspective view showing the connection with the members, FIG. 4 is a view showing the switching operation of the inside / outside air switching damper, and FIG. 5 is a view showing the connection between the fan motor for ventilation, the solar cell, and the first to third switches. The electric circuit diagram shown in FIGS. 6A and 6B is, respectively,
It is a figure which shows the extended state and the contracted state of the operating member which consists of shape memory alloys. 1 ... Blower, 2 ... Evaporator, 3 ... Heater core, 4 ...
… Exhaust passage, 5 …… Inside air inlet, 6 …… Outside air inlet, 7
...... Defroster outlet, 8 ...... Vent outlet, 9 ...... Heater outlet, 10 ...... Cooler unit, 11 ...... Heater unit, 12 ...... Ventilation fan, 12a ...... Same motor, 13 ......
Inside / outside air switching damper, 14 …… Air mix damper, 15 ……
Defroster damper, 16 …… Vent damper, 17 …… Heat damper, 18 …… Bypass damper, 19 …… Sub damper,
20 …… Actuating member made of alloy for shape memory, 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), 40 ...
Automotive air conditioner.

Claims (1)

[Claims] Claim: What is claimed is: 1. An inside air intake port and an outside air intake port; A blower arranged downstream, a heater unit arranged downstream of the blower, an exhaust passage communicating the air passage between the blower and the heater unit and the outside of the vehicle interior, and an exhaust passage in the exhaust passage. A ventilating fan that is arranged, a damper device that is selectively switchable to communicate one of the exhaust passage and the heater unit with the air passage and close the other, and is connected to the damper device. When the vehicle interior temperature rises above a predetermined value, the damper device is operated to connect the exhaust passage to the air passage and close the heater unit. A member, a first switch that is closed when the inside / outside air switching damper closes the outside air inlet, and a closing when the damper device is operated so that the discharge passage communicates with the air passage. An air conditioner for an automobile comprising: a second switch, a solar cell, and an electric circuit in which the solar cell, the first and second switches, and the motor for the ventilation fan are connected in series.