JPH0546484Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention is an air blowing control device that controls the amount of air being blown by changing the voltage applied to the fan motor of an automotive air conditioner, particularly the air blowing control device. This article relates to improvements in the mounting structure of temperature fuses attached to control devices.

(Prior Art) In general, a blower control device that controls the rotation of a blower in an automobile air conditioner sets the number of rotations of a fan motor to, for example, high speed rotation (hereinafter referred to as Hi), medium speed rotation (hereinafter referred to as M), and low speed rotation (hereinafter referred to as Hi). The control circuit connects a plurality of resistors having _a predetermined resistance value in series, and changes the total resistance value of the resistors as appropriate to control the voltage applied to the fan motor. I'm trying to change the voltage.

More specifically, this air blowing control device has a fifth
As shown in the figure, the current fuse of the automobile air conditioner is connected to the base line L to which one end of the battery B is connected.
A fan motor M is connected via F ₁ , and a resistance R (general term for R ₁ to _{R 3} ) is connected to this fan motor M.
It is connected to the fan switch SW through a temperature fuse F ₂ and a plurality of resistors R having a predetermined resistance value, or not through the temperature fuse F ₂ and the resistor R.

In this circuit, close the power switch SW, slide the mover K of the fan switch SW, and select the terminal T that determines the fan speed, such as high speed (Hi), medium high speed (MH), medium low speed (ML), low speed ( By appropriately selecting each terminal T ₁ to T ₄ for L _p ), it is possible to switch the fan speed to multiple _levels .
When set to MH, current flows through resistance R,
Each resistance R generates heat, and when an abnormality occurs such as when the motor locks, this resistance R
generates abnormal heat, and this heat causes the temperature fuse to
_F2 is fused to cut off the motor circuit.

The heat generated by the resistance R is cooled by the air flowing through the air passage D of the automobile air conditioner.Recently, for example, as shown in FIG. It is installed within the fan scroll Fs, and the heat of the resistor R is removed by the air blown by the fan f within the fan scroll Fs. In this case, in order to improve the heat dissipation of the resistance R of the actual ventilation control device, a pair of spring materials made of phosphor bronze protruding from the top of the base 1 is installed, as shown in FIG. 7A, B, and C. A temperature fuse F ₂ is attached to the tips of the support plates S ₁ and S ₂ to resist the elastic force of the support plates S ₁ and S ₂ , and the temperature fuse F ₂ is connected to three sides by each resistance R formed in a coil shape. Furthermore, the length l of the leg portion Ra of each coiled resistor R is lengthened to project from the base 1 into the air path D.
By doing this, the resistance R is brought into sufficient contact with the air, and the heat of the resistance R is quickly dissipated.
(See Publication No. 18728).

(Problem to be solved by the invention) However, if the blower control device configured in this way is installed in a place where wind flows, the fan will create resistance to the air flow, reducing the amount of air flowing through the air path D and causing wind noise. There is a possibility that this may occur. If the air conditioner is installed in a corner of an automobile air conditioner where there is little air circulation in order to reduce this resistance, it will be difficult to remove heat and the heat dissipation will be reduced.

In addition, in the above-mentioned resistance R, the legs Ra of each resistance R or the support plates S ₁ and S ₂ of the temperature fuse F ₂ are long, so they occupy a large space and are easily deformed by external forces. There are also drawbacks.

When installing this temperature fuse _F2 ,
Since the support plates S ₁ and S ₂ have to be mounted against their elasticity, the mounting work becomes extremely troublesome.

Furthermore, there is also a device in which the resistance R is installed inside a cage-shaped fuse box (Jitsukai Sho.
(Refer to Japanese Patent No. 59-186110), in this case, in addition to the drawbacks of the aforementioned reduction in heat dissipation and the generation of wind noise, there is also the problem that the assembly work when assembling the whole thing becomes troublesome.

The present invention was developed by focusing on the above-mentioned problems, and has low air flow resistance, extremely high heat dissipation of the resistance, and has good assembly workability of the temperature fuse and the entire device, and is advantageous in terms of cost. The object of the present invention is to provide a ventilation control device for an air conditioner for an automobile.

[Structure of the invention] (Means for solving the problem) In order to achieve the above object, the present invention achieves this by appropriately changing the total resistance value of a resistance section in which a plurality of resistors are electrically connected in series. , the resistor is configured to control the voltage applied to the motor for rotating the blower fan of the automobile air conditioner, and to control the rotational speed of the motor, and is fused due to abnormal heat generation of the resistor to electrically interrupt the motor circuit. In a blower control device for an automobile air conditioner equipped with a temperature fuse, a resistance circuit is formed by printing a resistance member constituting the resistance in a predetermined pattern on a rigid flat electrically insulating substrate, The temperature fuse is formed by forming a through hole so as to electrically interrupt the resistor circuit, and filling the through hole with solder so as to bridge the resistor circuit and electrically conduct the resistor circuit. shall be.

(Function) If such a means is adopted, the contact area between the resistance and the air will increase, resulting in an air blow control device with extremely high heat dissipation.Moreover, since it does not take up much space, it can be installed anywhere, and can be installed in a flat structure. As a result, the air blowing control device does not create any air resistance, and the ease of assembly of the temperature fuse and the entire device is greatly improved.

(Example) An embodiment of the present invention will be described below.

FIG. 1 is a schematic explanatory diagram showing an embodiment of the present invention;
FIG. 2 is a perspective view showing the main parts of the same embodiment, FIG. 3 is a sectional explanatory view of the main parts of FIG. 2, FIG. 4 is a perspective view showing the mounting state of the same embodiment, and The same members as those shown in the figures are given the same reference numerals, and their explanations will be omitted.

This air blowing control device 10 forms a circuit of the resistance R by printing a resistance member constituting the resistance R in a predetermined pattern in the form of a thin film on a rigid flat electrically insulating substrate 11. This is used as a resistor section 12, and this resistor section 12 is a fan scroll Fs shown in FIG.
It is attached to the ceiling board Ft inside the fan motor and controls the rotation speed of the fan motor M.

To explain this resistor part 12 in detail, as shown in FIGS. 2 and 3, the substrate 11 is a so-called enamel plate in which a heat-resistant layer 16 of glass or the like is electrically glazed on a steel plate 15 serving as a base material. be. This board 11
The resistor R is provided above, and the surface is covered with a heat-resistant layer 17 made of glass or the like to prevent dust from adhering from the outside.
This resistance R (general term for R ₁ to ₃ ) consists of a first resistance R ₁ , a second resistance R ₂ , and a third resistance R ₃ , and in forming the circuit of this resistance R on the substrate 11, After printing a thick film paste on the substrate 11 so that the resistance value of each resistor R becomes a predetermined value, it is fired. And each of these resistances R ₁ to ₃
By connecting each of the terminals T (generic name of T ₁ to ₄ ) described above to the end of the board, placing each terminal T and the resistor R on the substrate 11, and covering with the heat-resistant material 17, The resistor section 12 is used as the resistor section 12 .

In particular, in this embodiment, when installing the temperature fuse _F2 , the through hole 13 is opened so as to interrupt the circuit of the resistor R formed on the substrate 11,
This through hole 13 is bridged and solder 14 is welded to electrically connect the circuit of the resistor R to form a temperature fuse _F2 . In order to bridge this solder 14 to the through hole 13, as shown in FIG. Solder 14 may be applied so as to connect the resistors R at both ends of 13.

In addition, in order to attach this resistor part 12, the board 1
A screw (not shown) is inserted into a screw insertion hole 19 formed in a protruding piece 12a protruding from the periphery of the fan scroll Fs, and with each terminal T protruding outside from the fan scroll Fs, As shown, the ceiling plate Ft of the fan scroll Fs and the bell mouth 20 of the fan scroll Fs are inserted and tightened and fixed.

Next, the action will be explained.

The resistance R of the blower control device 10 configured as described above is determined by the fan switch SW shown in FIG.
By sliding the movable element K, the total resistance value is changed appropriately, and the rotation of the motor is set to Hi,
Switching is performed in four stages: MH, ML, and L _p . For example,
A case will be described in which the mover K selects the L _p position indicated by the dashed line.

When the mover K of the fan switch SW is connected to the L _p terminal T ₄ , the current from the battery B enters the Hi terminal T ₁ in FIG. 1 via the current fuse F ₁ and the motor M.

This current further flows as Hi terminal T ₁ → first resistance R ₁ → second resistance R ₂ → third resistance R ₃ → _Lp terminal T ₄ → mover K.

In this case, the first, second, and third resistances
When current passes through R ₁ to R ₃ , this resistance section 12 generates heat, and this heat is transmitted to the substrate 11 .

However, the resistance R is widely arranged over the entire substrate 11, and since the substrate 11 is flat and has a large area, and the contact area with the air is large, the transmitted heat is transferred to the fan scroll Fs. Heat is quickly radiated by the air passing through the air path D.

In addition, the resistance R has a flat structure and its surface area is extremely large compared to conventional coil type resistors, so the resistance R itself has a high heat dissipation property, and the heat dissipation property of the resistance part 12 is also high. will improve significantly.

Next, when the movable element K selects the Hi position, the current entering the Hi terminal _T1 in Fig. 1 does not flow to the resistance R side, but flows through the movable element K of the fan switch SW. If child K selects M _H position, the current is Hi terminal T ₁ → 1st
The current will flow from resistance R ₁ → M _H terminal T ₃ , and when mover K selects M _L position, the current will flow from Hi terminal T ₁ → first resistance R ₁
→ second resistance R ₂ → M _L terminal T ₃ , and the fan speed matches each current.

In this case, since the resistance part 12 is extremely flat and is attached closely to the ceiling plate Ft of the fan scroll Fs, it does not act as a resistance to the airflow flowing in this air path D, reducing the amount of circulating air. I won't let you. Also, there is no wind noise.

Further, in the air blow control device 10, if the fan motor M is locked for some reason, the temperature of the resistance R of the air blow control device 10 becomes abnormally high, but even though the cooling capacity is high, , this high temperature is directly connected to the temperature fuse _F2
As a result, the resistance circuit is cut off by the through hole 13. Therefore, even if the abnormal situation occurs, various inconvenient situations associated with it can be immediately avoided.

Furthermore, when assembling this blower control device 10, it is sufficient to fix the flat resistance part 12 to the ceiling plate Ft of the fan scroll Fs with screws, eliminating the need for conventional brazing, cages, etc., and simplifying the assembly work. This makes it possible to obtain something that is extremely simple, has a small number of parts, and is advantageous in terms of cost.

Although the resistance section 12 was installed inside the fan scroll Fs, the present invention can be installed not only in such a place but also anywhere inside the air path of an automobile air conditioner because of its good heat dissipation properties. This also greatly improves the freedom of installation location.

[Effects of the invention] As is clear from the above explanation, according to the invention, the resistance part is constructed by printing the resistance members constituting the resistance in a predetermined pattern on a rigid flat electrically insulating substrate. This results in a flat resistance part, which increases the contact area between the resistance and the air, greatly improving heat dissipation, and does not cause air flow resistance.Furthermore, it does not take up much space, so it can be installed anywhere. Since it does not create any resistance, the amount of air flowing through the air does not decrease. In addition, a through hole was made in the board to cut off the resistor circuit, this through hole was bridged, and a temperature fuse was formed by filling with solder to electrically conduct the resistor circuit, so it was difficult to install the temperature fuse. It has excellent properties and is advantageous in terms of cost.

[Brief explanation of the drawing]

Fig. 1 is a schematic explanatory diagram showing one embodiment of the present invention, Fig. 2 is a perspective view showing the main part of the same embodiment, Fig. 3 is a cross-sectional explanatory diagram of the main part of Fig. 2, and Fig. 4 5 is a perspective view showing the installation state of the same embodiment, and FIG. 5 is a circuit diagram of a blower control device for a general automobile air conditioner.
FIG. 6 is a perspective view showing the installed state of the air blow control device, and FIGS. 7A, B, and C are a plan view, a side view, and a sectional view of a main part showing the actual structure of a conventional resistor. 10... Air blow control device, 11... Board, 12...
...Resistance part, 13...Through hole, 14...Solder, M...
Motor, R...Resistance, _F2 ...Temperature fuse.

Claims (1)

[Scope of utility model claims] By appropriately changing the total resistance value of the resistance section in which a plurality of resistances R are electrically connected in series, the voltage applied to the motor M for rotating the blower fan of the automobile air conditioner is controlled, and the rotation of the motor M is controlled. In an air blowing control device for an air conditioner for an automobile, the temperature fuse _F2 is configured to control the number of heat generated by the resistor R and is blown by abnormal heat generation of the resistor R to electrically interrupt the motor circuit.
A resistance circuit is formed by printing the resistance members constituting the resistance R in a predetermined pattern on a rigid flat electrically insulating substrate 11, and a through hole is formed to electrically interrupt the resistance circuit. 13, and solder 14 is applied so as to bridge this through hole 13 and make the resistor circuit electrically conductive _.
An air blow control device for an air conditioner for an automobile, characterized in that the air blow control device comprises: