JPH0728006Y2 - Blower control device for automobile air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to a blower control device that controls the amount of air blown by a blower by changing the voltage applied to a fan motor of an automobile air conditioner. , For improvement of so-called flat resistance.

(Prior Art) The air flow rate of a general automobile air conditioner is controlled by a blower control device, and various control devices have been developed in recent years. For example, in the air blow control device disclosed in Japanese Utility Model Publication No. 56-18,728, a coil-shaped resistance that has been conventionally used is arranged so as to surround a fuse. It is attached to the side wall.

In addition, in order to solve the problems of the ventilation resistance and the wind noise that the above-mentioned ventilation control device has, for example, in Japanese Utility Model Laid-Open No. 63-171,210
The blower control device disclosed in Japanese Patent Publication has been developed.

This air flow control device called flat resistance,
A plurality of unit resistances are printed on a flat electrically insulating substrate to form a circuit of a resistance unit that connects the unit resistances in series, and a terminal is connected to each unit resistance. The value of the current flowing through the resistance portion is controlled stepwise by appropriately selecting. Then, as shown in FIGS. 4 to 5, the insulating substrate is formed in a horizontally long shape (FIG. 4) or a vertically long shape (FIG. 5) and is attached in the air passage of the intake unit.

Furthermore, a blower control device using a so-called power transistor is also known.

(Problems to be solved by the invention) However, since the above-mentioned flat resistance has a vertically long shape or a horizontally long shape, there is a restriction on the installation position when arranging it in the intake unit, etc., and the degree of freedom in designing the intake unit is extremely high. It was also a factor that hindered the miniaturization of the unit by narrowing it.

Further, in the case where the above-mentioned coil resistance and the above-mentioned flat resistance are exposed to the fan scroll portion of the intake unit, for example, in any fan control device, the board holding member 3 as shown in FIG. The board 2 is inserted and fixed, and the board holding member 3 is attached by inserting the board holding member 3 into the opening 6 formed in the intake unit 5 as shown in FIG. It must be opened in intake unit 5. This not only hinders compatibility between the flat resistance and the coil resistance, but also makes it difficult to share the intake unit.

Furthermore, the air flow control device disclosed in Japanese Utility Model Laid-Open No. 61-193,806 is difficult to manufacture and is not satisfactory in safety due to heat generation.

The present invention has been made in view of such problems of the conventional art, and an object of the present invention is to provide a blower control device that has few restrictions on the arrangement position and is compatible.

[Means for Solving the Problem] (Means for Solving the Problems) The present invention for achieving the above object is to appropriately change the resistance value of a resistance section in which a plurality of unit resistances are electrically connected in series, and to use the air for automobiles. A blower control device for an air conditioner for a vehicle, in which a voltage applied to a blower fan rotation motor of the air conditioner is controlled to control the rotation speed of the motor in a stepwise manner. A plurality of unit resistances forming the resistance unit are printed on a substrate in a predetermined combination, the unit resistances printed on the respective substrates are connected in series, and terminals are provided on the respective unit resistances, Each board is attached to the board holding member so as to face each other, and the unit resistances printed on each board are electrically connected to the board holding member. It was a blowing control apparatus for an automobile air conditioning system, characterized in that the embedded conductive member constituting the resistance circuit.

(Operation) In the present invention thus configured, since the unit resistance constituting the resistance portion is divided on at least two substrates and the substrates are attached to the substrate holding member so as to face each other, The length of one side of the substrate can be shortened, and the degree of freedom in the arrangement position of the blower control device is increased. Further, by shortening the length of one side in this way, the shape of the substrate holding member can be shared with other air blowing control devices, and a highly compatible air blowing control device can be obtained.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is a circuit configuration diagram of the same embodiment.

First, as shown in FIG. 3, a fan motor M for driving a fan of a blower is connected to a base line L connected to one end of a battery B of a vehicle through a current fuse F ₁ of an automobile air conditioner. There is. Furthermore, the fan motor M has
A resistance unit ₁ made up of two flat resistances in which a resistance R (general term for unit resistances R _{1 to} R ₃ ) is formed.
The fan switch SW is connected to the drive circuit Mc of the fan motor M by this.

In the drive circuit Mc of the fan motor M, by sliding the mover K of the fan switch SW, the terminal T (general term for the unit terminals T _{1 to} T ₄ ) that determines the rotation speed of the fan motor M is appropriately selected. The number of rotations of the fan motor M is changed in multiple stages. In the case of the present embodiment, this terminal T is a unit terminal T ₁ for high speed (HI), a unit terminal T ₂ for medium and high speed (MH), a unit terminal T ₃ for medium and low speed (ML), a unit for low speed. It is composed of four terminals of the terminal T _4.

In the resistor portion 1 consisting of two flat resistance, flat electrically insulating substrate 2a, on a 2b, a plurality of unit resistance R ₁ to R ₃ is printed by a predetermined combination, the unit resistance R ₁ to R ₃ Is connected in series to form the circuit of the resistor portion 1, and the unit resistances R _{1 to} R ₃ are respectively connected to the unit terminals T _{1 to} T ₄ described above.
Are connected.

Here, the substrates 2a, 2b are constituted by so-called enamel plates in which heat-resistant insulating layers are electrically glazed on the upper and lower surfaces of a base iron plate, and the resistance R described above is printed on the substrates 2a, 2b. Further, the surface thereof is covered with a heat-resistant insulating layer such as glass for the purpose of preventing dust adhesion.

Further, the combination of the unit resistances R _{1 to} R ₃ in the present embodiment forms the unit resistance R ₁ on the substrate 2a,
Unit resistances R ₂ and R ₃ are formed on 2b. In forming the circuit of the resistance R on the substrates 2a, 2b, the resistance members constituting the unit resistances are arranged on the substrates 2a, 2b so that the resistance values of the respective unit resistances R _{1 to} R ₃ become predetermined values. This is achieved by printing on a predetermined pattern and then fixing by baking. The combination of the unit resistances R _{1 to} R ₃ is not limited to this embodiment, and can be variously modified.

Further, the two substrates 2a and 2b thus formed are
1 and 2, the unit resistances R _{1 to} R ₃ are inserted into the substrate holding member 3 in a state where they are juxtaposed so that the substrate surfaces printed with the unit resistances R _{1 to} R ₃ face each other. It is fixed by. A conductive member 4 for electrically connecting the unit resistance R ₁ and the unit resistance R ₂ shown in FIG. 3 in series is embedded in the substrate holding member 3. This is a member for connecting the resistance circuit in series when the substrate is divided into two, and can be easily embedded by insert molding when molding the substrate holding member 3. Therefore, at the contact portions of the unit resistances R _{1 to} R ₃ that come into contact with the conductive member 4, the heat resistant insulating layer such as glass is cut so that the surface thereof is exposed.

A flange portion 7 is formed on the substrate holding member 3, and a hole 8 is formed in the flange portion 7. Then, as shown in FIGS. 2 and 6, after the control device is inserted into the opening 6 formed in the intake unit case 5, the control device is fixed to the case 5 with the bolt 9.

Next, the operation will be described.

In the air blow control device of this embodiment configured as described above, the total resistance value is appropriately changed by sliding the mover K of the fan switch SW shown in FIG. 3, and the rotation of the motor is changed to Hi, MH, Switching to four stages of ML and LO will be described below in the case where the mover K selects the LO position of the alternate long and short dash line position.

When the mover of the fan switch SW is connected to the LO terminal T ₄ , the current from the battery B flows to the HI terminal T ₁ via the current fuse F ₁ and the motor M. Furthermore, this current is HI terminal T ₁ →
Unit resistance R ₁ → thermal fuse F ₂ → unit resistance R ₂ → conducting member 4 → unit resistance R ₃ → LO terminal T ₄ → mover K.

As described above, when the conventional substrate is divided and the unit resistances are connected in series, the unit resistances formed on the respective substrates cannot be electrically connected. However, in the present embodiment, the substrate holding member is used. The conductive member 4 is embedded in the conductive member 4 by insert molding, and the substrates 2a,
Since the unit resistances R ₁ and R ₂ formed in b are configured to be in contact with each other, the substrate can be easily divided, which makes it possible to shorten the length of one side of the blower control device. Therefore, by reducing the length of one side of a substrate that has conventionally been obliged to be formed horizontally or vertically, a coil-shaped control device that has been conventionally used or a control device that is configured by a power transistor The shape of the substrate holding member 3 can be shared, and the air blow control devices can be compatible with each other both when manufacturing an air conditioner for a vehicle and when repairing and replacing when the vehicle is used by a user. Yes, it will be extremely convenient.

On the other hand, when a current flows through each of the unit resistances R _{1 to} R ₃ , the resistance R circuit generates heat, but the length of one side of one substrate becomes shorter than the length of one side of a conventional substrate. Therefore, if the control device is arranged in the intake unit 5 so that the air flows in the direction of arrow A shown in FIG. 1, the heat dissipation effect is further improved. Moreover, in this case, in this embodiment, the above-mentioned thermal fuse is used.
Since F ₂ is provided on the board 2a side as shown in FIG. 2, even if the fan motor M is locked for some reason, the heat generated by the unit resistances R ₂ and R ₃ formed on the board 2b side can be detected. can do. Furthermore, in order to make it easier to drop due to gravity, this thermal fuse F ₂ is provided so as to be located on the lower surface of the substrate 2a arranged on the upper side, so that the responsiveness is improved.

In the present embodiment, the case where the blower control device is installed in the fan scroll of the intake unit 5 has been described, but the present invention is not limited to the intake unit and has good heat dissipation and a small size. As a result, it can be installed anywhere inside the air conditioner of an automobile air conditioner, and the degree of freedom of installation position is greatly improved.

[Advantage of the Invention] As described above, according to the present invention, the unit resistance forming the resistance part is divided into at least two substrates,
Since this board is configured to be attached to the board holding member so as to face each other, the degree of freedom in the arrangement position of the blower control device is increased, which is extremely advantageous in reducing the size of the vehicle air conditioner case. .

Further, the shape of the substrate holding member can be shared with other blower control devices, and it is highly compatible both at the time of manufacturing the automobile air conditioner and at the time of subsequent repair and replacement.

[Brief description of drawings]

1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, FIG. 3 is a circuit configuration diagram of the same embodiment, and FIGS. Is a perspective view showing a conventional air blow control device,
FIG. 6 is a partially cutaway perspective view showing an intake unit to which a blow control device is attached. 1 ... resistor, 2a, 2b ... substrate, 3 ... substrate holding member,
4 ... Conductive member, M ... Motor, R ... Resistance,
R ₁ , R ₂ , R ₃ ...... Unit resistance, T ...... Terminal.

Claims (1)

[Scope of utility model registration request] 1. A motor (M) for rotating a blower fan of an air conditioner for an automobile (M), wherein a resistance value of a resistance portion (1) in which a plurality of unit resistances (R _{1 to} R ₃ ) are electrically connected in series is appropriately changed. ), A blower control device for an automobile air conditioner in which the rotation speed of the motor (M) is controlled stepwise, at least two flat electrically insulating substrates (2a, 2b) a plurality of unit resistances (R _{1 to} R ₃ ) forming the resistance part (1) are printed in a predetermined combination, and the unit resistances (R ₁ ) are printed on the substrates (2a, 2b). ₁ ~ R
₃₎ as well as connected in series, each of the unit resistance (R ₁ to R _3), respectively terminals (T1-T4) to provided, each substrate (2a, 2b) and are opposed to each other the substrate holding member (3) Unit resistance (R _{1 to} R ₃ ) printed on each substrate (2a, 2b) on the substrate holding member ( ₃ )
A ventilation control device for an air conditioner for a vehicle, characterized in that a conduction member (4) for electrically connecting them to form a resistance circuit is embedded.