JPS6325204Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECTIVES OF THE INVENTION (INDUSTRIAL APPLICATION FIELD) The present invention relates to an automotive air conditioner, and more particularly to a resistor used to control the speed of a fan motor thereof.

(Prior Art) A circuit for controlling the speed of a fan motor in a conventional air conditioner for an automobile is shown in FIG. That is, battery 10, fuse F
1. DC motor 20, temperature fuse F2, resistor 3
1, 32, and 33 are connected in series, and these connection points and each terminal of the fan switch 40 are connected as shown. And fan switch 40
By switching, the value of the series resistance between the DC motor 20 and the ground changes, so the rotation speed of the DC motor 20 is adjusted according to the value of the series resistance at that time. There is. In addition, 2 in the figure
1 indicates fan, H, MH, ML,
L indicates high speed, medium high speed, and medium low speed of the motor 20, respectively. These are low speed terminals.

FIG. 7 shows resistors 31 and 3 of the above conventional example.
2, 33 and a terminal plate 50 for fixing them.
FIG. FIG. 8 is a right side view of FIG. 7. These resistors 31, 32, 33 are provided at a position receiving the wind from the fan 21 in the air conditioner, for example, at a fan scroll part, in order to dissipate the heat generated therein.
As shown in the figure, the resistors 31, 32, and 33 are formed in a spiral shape.

(Problem that the invention aims to solve) However, such conventional resistors are installed in places where the air from the fan flows, and have a spiral shape as described above, so they are difficult to deal with the air blown by the fan. There was a problem in that the ventilation resistance became large, which reduced the efficiency of the DC motor that drove the fan. Another problem was that when the air from the fan collided with this resistance, wind noise was generated.

The present invention was devised in view of the problems of the prior art described above, and it improves the efficiency of the fan drive motor of an automotive air conditioner without impairing the heat dissipation effect generated in the resistor, and also reduces noise. The purpose is to provide a resistance that reduces the

[Structure of the idea]

(Means for Solving the Problems) The present invention provides an air conditioner for an automobile having an air passage for blowing conditioned air into a vehicle interior by a fan, which is connected in series with a DC motor that drives the fan, and which is connected in series with a DC motor that drives the fan. A resistance disposed in the air passage whose value is adjusted to control the rotational speed of the DC motor is flattened so that its cross-sectional area in the air flow direction is small. The above object is achieved by a speed control resistor for a fan motor for an automobile air conditioner, which is characterized in that it has a shape.

(Function) In the present invention configured as described above, since the ventilation resistance to the air blowing from the fan is reduced, the resistance can be installed in a place where the air flow is large.
The efficiency of the fan motor can be improved while maintaining the dissipation of heat generated in the resistor. Furthermore, as the ventilation resistance is reduced, wind noise generated when the wind from the fan collides with the resistance can be reduced.

(Example) Hereinafter, a description will be given based on the illustrated example of the present invention.

Fig. 1 is a front view showing a resistor according to one embodiment of the present invention, and Fig. 2 is a right side view of Fig. 1. In this embodiment, resistor 60 is formed in a spiral shape, but as is clear from Fig. 2, it is in a flat shape. When this resistor 60 is actually attached to terminal board 50, it is rotated in the direction shown by the arrow in Fig. 2 (left and right direction).
In FIG. 1, this means that the air flows in a direction perpendicular to the plane of the drawing.

Although only one resistor is shown in Figure 1,
There are three similar resistors, and the circuit diagram thereof can be considered to be similar to that in FIG. That is, in FIG. 6, it can be considered that three resistors 60, 60, and 60 are provided instead of resistors 31, 32, and 33.

By doing so, the ventilation resistance to air blowing from the fan is reduced, and the efficiency of the DC motor is improved compared to the conventional resistance.

For example, when using an automobile air conditioner installed in a small car with an engine displacement of 2000 cc or less, the ventilation resistance between the resistance of this embodiment and the conventional resistance, as well as the reduction in fan air flow due to the ventilation resistance. To explain this based on the experimental results of measuring the values, when the air flow rate at the vent outlet of the automobile air conditioner is 7 m ³ /min, when the conventional resistors 31, 32, and 33 are installed in the fan scroll part, the ventilation resistance is 6 mmAq, and the air volume reduction value at the vent outlet was 0.3 m ³ /min.

On the other hand, when the resistors 60, 60, and 60 of this embodiment are installed in the same fan scroll part as the conventional resistor using a similar device, the ventilation resistance is 2 mmAq, and the vent outlet The air volume reduction value was 0.1 m ³ /min. According to the experimental results, the resistance of this example reduces the air volume at the vent outlet in the vehicle compared to the conventional resistance.
0.2m ³ /min improvement, for example, approximately 100kcal when cooling
This means that the cooling capacity will be improved by 0.3 to 0.5 degrees Celsius (converted to vehicle interior temperature).

As is clear from the above experimental results, with the resistance of this example, the ventilation resistance to air blowing from the fan is reduced and the efficiency of the DC motor is improved. The sound also becomes smaller.

In the above embodiment, when the resistor 60 is fixed to the terminal board 50, it may be installed so that air flows in the left and right directions in FIG.
(In the figure, the air flows in a direction perpendicular to the drawing.) In this case as well, the efficiency of the DC motor 20 is improved and the wind noise is reduced.

FIG. 3 is a front view showing another embodiment of the present invention, FIG. 4 is a right side view of FIG. 3, and FIG.
FIG. In this embodiment, the resistor 70 is formed flat in a zigzag shape, and is similar to the conventional resistors 31, 32, 3
3, the ventilation resistance to air blowing from the fan is reduced, and the wind noise caused by this resistance 70 is also reduced.

[Effect of idea]

As described above, according to the present invention, the resistor connected in series with the DC motor and for controlling the rotational speed of the DC motor by adjusting its value has a flat shape. , the ventilation resistance to the air blowing from the fan is reduced, which can improve the efficiency of the fan motor without impairing the heat dissipation effect generated by the resistance, and also reduce the wind noise caused by this resistance. be able to.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention;
The figure is a right side view of Fig. 1, Fig. 3 is a front view showing another embodiment of the present invention, Fig. 4 is a right side view of Fig. 3,
FIG. 5 is a plan view of FIG. 3, FIG. 6 is a circuit diagram of a conventional automobile air conditioner, FIG. 7 is a front view showing a conventional fan speed control resistor and terminal board, and FIG.
The figure is a right side view of FIG. 7. 20... DC motor, 40... Fan switch, 31, 32, 33, 60, 70... Resistor for motor speed control, 50... Terminal board.

Claims (1)

[Claims for Utility Model Registration] (1) An air conditioner for an automobile having an air passage for blowing conditioned air into a vehicle interior by a fan, which is connected in series with a DC motor that drives the fan, and which is connected in series with a DC motor that drives the fan, A resistor disposed in the resistor whose value is adjusted to control the rotational speed of the DC motor has a flat shape so that its cross-sectional area with respect to the air flow direction is small. A speed control resistor for a fan motor for an automotive air conditioner, characterized by: (2) The resistor for controlling the speed of a fan motor for an automotive air conditioner according to claim (1) of the utility model registration claim, wherein the resistor has a flat spiral shape. (3) The resistor for speed control of a fan motor for an automotive air conditioner according to claim (1) of the utility model registration, wherein the resistor has a zigzag shape.