JPS647887B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an air conditioner for a vehicle that prevents water droplets adhering to an evaporator from scattering when the vehicle makes a sudden turn.

Conventional technology As a conventional vehicle air conditioner, the one shown in Figs.
No. 157710). That is, the vehicle air conditioner is composed of a blower unit 1, a cooling unit 2, and a heater unit 3. The blower unit 1 is provided with a blower 4 and a motor 5 for rotationally driving the blower 4, and the cooling unit 2 is provided with an evaporator 6 and a splash prevention net 7 located downstream of the evaporator 6. ing. The heater unit 3 is also provided with a heater core 8, an air mix door 9, and further has a defroster outlet 10, a ventilator outlet 11, a foot outlet 12, and the like. In such a structure, water droplets that adhere to the surface of the evaporator 6 due to dew condensation occur when the vehicle makes a sudden turn or starts,
Due to the synergistic effect of the centrifugal force and the wind force generated by the blower during a sudden stop, etc., the air is blown away and is sent to the heater unit 3 along with the air supplied from the blower unit 1.
or enter the room by scattering from the ventilator outlet 11 or the like. At this time, since the water droplet prevention net 7 is stretched on the downstream side of the evaporator 6, the water droplets are absorbed by the water splash prevention net 7.
Water droplets are prevented from entering the heater unit 3 by the water droplets, and water droplets leak from the joint between the cooling unit 2 and the heater unit 3, or from each outlet 0,
This can prevent the inconvenience of air being blown into the vehicle interior from the air vents 11 and 12.

Problems to be Solved by the Invention However, in the conventional device, since the water splash prevention net 7 is stretched on the downstream side of the evaporator 6, the water splash prevention net 7 has constant ventilation resistance. At the same time, as the air is fed, the dust mixed in the air gradually clogs the water splash prevention net 7, and the ventilation resistance gradually increases. For this reason, even if the blower 4 is rotated at high speed, sufficient air volume cannot be obtained, resulting in disadvantages such as a decrease in rapid cooling characteristics due to the reduction in air volume.

The present invention has been made in view of the above-mentioned conventional circumstances, and provides a vehicle air system that prevents water droplets adhering to the evaporator from scattering when turning, etc., without using a water-splash prevention net that has the disadvantages described above. It provides a harmonization device.

Means for Solving the Problems In order to solve the above problems, the present invention includes a motor-driven blower that supplies air to the evaporator, and a setting operation performed by a passenger to control the rotation speed of the blower. In the air conditioner, the motor control circuit is provided with a sensitive control means that senses acceleration of the vehicle and controls the applied voltage to be reduced in accordance with the acceleration. be.

Operation In the above configuration, the motor control circuit applies a voltage to the motor based on a setting operation by the occupant, and the motor rotates the blower at a speed corresponding to the applied voltage. When acceleration occurs in the vehicle due to a sharp turn or the like, the sensitive control means senses the acceleration and controls the motor applied voltage to be reduced in accordance with the acceleration. Therefore, the voltage applied to the motor temporarily decreases in accordance with the acceleration, the rotational speed of the blower decreases, and the amount and speed of air supplied to the evaporator decrease. Therefore, due to the synergistic effect of the centrifugal force caused by sharp turns, water droplets that had been blown away from the evaporator fall near the evaporator without being transferred with the supplied air, causing water droplets to enter the passenger compartment, etc. is prevented.

Embodiment An embodiment of the present invention will be explained below with reference to the drawings. That is, as shown in FIG. 1, the vehicle air conditioner includes a blower unit 1, a cooling unit 2, and a heater unit 3, and the evaporator downstream passage 13 of the cooling unit 2 faces in the vehicle width direction. The blower unit 1 includes a blower 4 and a motor 5 for rotationally driving the blower 4.
The cooling unit 2 is provided with
An evaporator 6 is provided that adiabatically expands the refrigerant to cool the flowing air. The heater unit 3 is provided with a heater core 8 and an air mix door 9, and is further provided with a defroster outlet 10, a ventilator outlet 11, a foot outlet 12, and the like. A motor control circuit 14 that controls the voltage applied to the motor 5 includes a movable contact 15, a fixed contact L,
It has a fan switch 16 equipped with M and H, and fixed resistors R ₁ and R ₂ connected in series, and the fixed resistor R ₂
An acceleration sensor 17 serving as a sensitive control means is provided between the motor and the motor. The acceleration sensor 17 is
A curved resistor 18 and a slider 2 that rotates around a pivot point 19 while its tip portion slides into contact with the resistor 18.
This is a variable resistor consisting of 0. The resistor 18
is formed in the vehicle width W direction along the arrangement direction of the evaporator downstream passage 13 of the cooling unit 2, and the slider 20 is formed in the vehicle width direction to sense the centrifugal force when the vehicle makes a sharp turn. It is pivotably supported in the width W direction.

In this embodiment with the above configuration, when the fan switch 16 is operated together with the refrigeration cycle operation switch (not shown), the voltage applied to the motor 5 is determined according to the contact position of the movable contact 15 with the fixed contacts L, M, and H. The blower 4 rotates at an appropriate speed and blows air. Then, dew condensation occurs on the surface of the evaporator 6 as a result of heat exchange with the supplied air. If the vehicle makes a sharp turn in this state, the vehicle width W
A centrifugal force is generated in the evaporator 6 in the cooling unit 2 which is disposed in the direction, and water droplets adhering to the fin surface of the evaporator 6 are shaken off and dripped by the centrifugal force and the force of the wind from the blower. However, at the same time, the slider 20 of the acceleration sensor 17
rotates around pivot point 19 due to centrifugal force, displacing its tip contact portion (arrow A). As a result, the resistance value of the acceleration sensor 17 increases instantaneously, the voltage applied to the motor 5 decreases, and the rotational speed of the blower 4 suddenly decreases. Therefore, the speed of the air being fed temporarily decreases, and the water droplets blown away from the evaporator 6 enter the cooling unit 2 without being given a force that can resist gravity from the air flow. Free fall. The water droplets that have fallen into the cooling unit 2 are drained out of the vehicle through the drain opening 21, without using a splash prevention net.
This eliminates problems such as water droplets entering the heater unit 3, scattering from the ventilator outlet 11, etc., and entering the room, or leaking from the joint between the cooling unit 2 and the heater unit 3, etc. be.

In this embodiment, since the evaporator downstream passage 13 of the cooling unit 2 is formed in the vehicle width W direction, water droplets are blown away by the centrifugal force during sharp turns. The acceleration sensor 17 was configured to operate by sensing centrifugal force. However, the evaporator downstream passage 13
However, if the evaporator is facing the front of the vehicle, an acceleration sensor is used to detect positive acceleration when the vehicle starts suddenly, and if the downstream passage of the evaporator is facing toward the rear of the vehicle, an acceleration sensor is used to detect the negative acceleration that occurs during sudden deceleration. By using an acceleration sensor that detects the acceleration of
Of course, a reliable water splash prevention effect can be obtained.

FIG. 2 shows another embodiment of the present invention, in which an acceleration sensor 17 is provided in a circuit between the motor 5 and a fixed contact H that applies the highest applied voltage to the motor 5. In FIG. According to this embodiment, when there is no water droplet scattering toward the heater unit 3 side (when fixed contacts L and M are selected), air flow control is not performed according to the acceleration, and water droplets are scattered only when the airflow is large. In order to prevent this, the air volume is controlled by the acceleration sensor 17. Therefore, unnecessary air volume control is avoided, and more stable air conditioning can be achieved. In addition, as shown by the broken line in the figure, if an acceleration sensor 17 is provided that also controls the resistance on the fixed contacts L and M side, it is possible to perform control according to acceleration even when the air volume is small, and the third Of course, the present invention can also be put to practical use even in the case of a motor control circuit 14 having stepless control characteristics using the power transistor 22 as in the embodiment shown in the figure. Further, in each of the embodiments, the acceleration sensor 17 consisting of the resistor 18 and the slider 20 is used as the sensitive control means, but the sensor is not limited to this and may have a sensor section and a control section separately. Based on the output signal from the
It is also possible to have a configuration in which the applied voltage is controlled.

Effects of the Invention As explained above, the present invention detects the acceleration of the vehicle in the control circuit of the motor that rotates the blower.
Since a sensitive control means was provided to reduce the applied voltage according to the acceleration, water droplets adhering to the evaporator were blown away by the synergistic effect of the acceleration generated in the vehicle and the wind force generated by the blower. By controlling the wind speed by slowing down the blower as the applied voltage decreases, the synergistic effect described above can be eliminated, and water droplets can be prevented from scattering. Therefore, without using a water splash prevention net that permanently increases ventilation resistance, water droplets may enter the heater unit, scatter from the ventilator outlet, etc., and enter the room, or the cooling unit and heater unit may It is possible to reliably prevent leakage from the joints between the parts and intrusion into the vehicle interior.

[Brief explanation of drawings]

Fig. 1 is a conceptual diagram showing one embodiment of the present invention, Figs. 2 and 3 are circuit explanatory diagrams showing other embodiments of the present invention, and Fig. 4 shows a conventional air conditioner for a vehicle. The conceptual diagram, FIG. 5, is a perspective view showing the cooling unit of the air conditioner. 4... Blower, 5... Motor, 6... Evaporator, 14... Motor control circuit, 17... Acceleration sensor (sensitive control means), 18... Resistor, 20
...Suriko, 21...Drain.

Claims (1)

[Claims] 1. An air conditioner comprising a blower that is driven by a motor and supplies air to an evaporator, and a motor control circuit that applies a voltage to the motor based on a setting operation to control the rotation speed of the blower, wherein the motor control circuit An air conditioner for a vehicle, further comprising a sensitive control means that detects the acceleration of the vehicle and controls the applied voltage to be reduced in response to the acceleration.