JPH0125689Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a structure for preventing overheating of a register device for controlling a blower in an air conditioner.

(Prior art and its problems) Conventionally, as a method for adjusting the capacity of an air conditioner, a resistor device (hereinafter simply referred to as "register device") for controlling a blower, which is composed of resistors with various resistance values, is used to control the motor that drives the blower. A method is known in which the number of rotations of the blower is changed by selecting the resistance value of the resistor using a "register device" (referred to as a "register device") to adjust the amount of air blown. A resistor device used for controlling a blower in such an air conditioner generally uses a coiled nichrome wire as a resistor. This resistor device is disposed in a duct of an air conditioner, and the nichrome wire serving as a resistor is air-cooled by the blower. For this reason, if an abnormality occurs in the motor that drives the blower and the blowing of air stops, or if an overcurrent flows through the nichrome wire as a resistor, the nichrome wire as a resistor becomes overheated. For this reason, the nichrome wire used as a resistor becomes hot, and there is a risk that it will ignite the resin-based materials often used in air conditioners, causing a fire. Therefore, in order to solve the above-mentioned problems, a technology was developed in which the nichrome wire as the resistor of the resistor device was fixed to the connecting terminal via a temperature fuse while having a repulsive force against the connecting terminal.
- Known by No. 37384. However, with this technology, the nichrome wire used as a resistor becomes extremely hot during the abnormality described above, and the nichrome wire is left exposed.
Furthermore, as time passes, the repulsive force of the nichrome wire may not be as expected, and the risk of causing a fire as described above still remains.

(Purpose of the invention) The present invention has been made in view of the above circumstances, and aims to provide a resistor device for controlling a blower that prevents the risk of fire caused by the high temperature of the resistor forming the resistor. purpose.

(Means for solving the problem) In order to solve the above problem, in this invention,
A register device for controlling a blower, in which a register for controlling the speed of the blower motor is connected to the blower motor, and the register is air-cooled by a blower driven by the blower motor,
The resistor is constructed by incorporating a resistor into a resistor holding member, and providing a heat dissipation member on the resistor holding member, and the terminal of the resistor extending from the resistor holding member is located close to the resistor holding member. Furthermore, the connecting terminal is fixed to the terminal of the resistor through a thermal fuse with a repulsive force.

(Function) According to the above configuration, the resistor that becomes the heat generating element is incorporated into the resistor holding member, and the heat dissipation member is provided on the resistor holding member, so that the heat generated by the resistor raises the resistor to the ignition temperature. It's hard to do. In addition, since the connecting terminal was fixed to the terminal of the resistor in close proximity to the resistor holding member through the temperature fuse with a repulsive force against the terminal of the resistor, the temperature fuse easily melts and the connecting terminal immediately The connection terminal separates from the resistor terminal due to the repulsive force.

(Example) Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.

FIG. 1 is a perspective view of a register device for controlling a blower according to an embodiment of the present invention, and FIG. 2 is a plan view of the ceramic register. In the drawings, reference numeral 1 denotes a resistor device (hereinafter simply referred to as "resistor device") for controlling a blower, and the resistor device 1 includes a resistor 2 mounted on a ceramic substrate (resistor holding member) 3 and formed by etching. A ceramic register 4 and a heat dissipating member with fins (heat dissipating member) disposed on both sides of the ceramic register 4.
5 and a heat dissipating member 6.
, a mounting board 9 to which the resistor 7 is attached via a spacer 8, and a connector housing 11 that is integrally formed with the mounting board 9 and accommodates a connecting terminal 10 connected to the terminal 2a of the resistor 2. It is composed of

The ceramic resistor 4 is formed by mounting a resistor having a predetermined thickness on a rectangular ceramic substrate 3, and etching the mounted resistor so as to obtain a predetermined resistance value to form the resistor 2.
Approximately L from the position of the resistor 2 having a predetermined resistance value
Three letter-shaped terminals 2a extend to one side of the ceramic substrate 3, respectively. Ceramic substrate 3
The entire surface of the resistor 2 is closely covered with an insulator 12 such as cement, and the terminals 2a of the resistor 2 are formed so as not to be short-circuited.

The finned heat sink 5 has a large number of fins 5b erected on a plate 5a having a predetermined thickness, which is formed to closely cover the top surface of the ceramic register 4 in FIG. It is constituted by setting. The heat dissipating member 6 is formed of a rectangular plate having approximately the same thickness as the plate 5a of the finned heat dissipating body 5 and having the same shape as the ceramic substrate 3, and covers the lower surface of the ceramic register 4 in a close state. It is configured like this.

The mounting board 9 is made of a material such as flame-retardant resin or ceramic and has a substantially oval shape.
In the figure, a connector housing 11 is integrally formed on the lower surface 9a. Bolt insertion holes 9b, 9b, 11a, and 11a are provided at both ends of the mounting board 9 and the connector housing 11 for mounting the register device 1 into a duct of an air conditioner (not shown).

The resistor 7 is made up of a finned heat dissipating member 5 and a heat dissipating member 6 disposed on both sides of the ceramic register 4.
3 and 13 are attached to the bolt insertion holes (not shown) provided in the mounting board 9 and the spacer 8 is provided in the register 7, respectively.
into the nut 1 through the cylindrical spacer 8.
It can be attached by screwing 4 and 14.

As shown in FIG. 3, the connection terminal 10 is made of a material with good elasticity and has a substantially Z shape, and its substantially central portion is fixed to the mounting board 9. One end 10a of the connecting terminal 10 is fixed to a position close to the ceramic substrate 3 of the terminal 2a of the resistor 2 via a temperature fuse 15 with a repulsive force against the terminal 2a. When the resistor 2 reaches a high temperature, the temperature fuse 5 melts, and the repulsive force of the connecting terminal 10 immediately disconnects one end 10a of the connecting terminal 10 from the terminal 2a of the resistor 2. The other terminal 10b of the connection terminal 10 is inserted into a terminal insertion hole (not shown) of the mounting board 9 and is inserted into the connector housing 1.
The end portion 10b, together with the connector housing 11, forms a connector insertion portion 16.

The effects of the embodiments of the present invention will be described below.

If an abnormality occurs in the blower drive motor and air cannot be blown, or if an overcurrent flows through the resistor 2, the temperature of the resistor 2 will rise, but this resistor 2 is connected to the ceramic substrate. 3 and an insulator 12 made of cement or the like. Moreover, the ceramic substrate 3 and the insulator 12 are sandwiched between the heat dissipating member 5 with fins and the heat dissipating member 6 in a sandwich-like configuration, and the heat dissipating area is large, so that air may not be blown or the resistor may be damaged due to overcurrent. Even when the temperature reaches high temperature, the resistor 2, the ceramic substrate 3 covering it, and the insulator 12
The rate of temperature rise is slow, and the temperature reached is kept relatively low. Further, when the resistor 2 becomes hot in this way, the connection terminal 10 is connected to the terminal 2a of the resistor 2.
Since the terminals 2a are fixed in close proximity to the ceramic substrate 3 through the temperature fuses 15 with a repulsive force against the terminals 2a, the temperature fuses easily melt, and the connecting terminals 10 immediately become resistant as shown in FIG. body 2
away from the terminal 2a, and turn off the power supply circuit (not shown) at an early stage.

(Effects of the invention) As detailed above, according to the blower control register device of the present invention, a register for controlling the speed of the blower motor is connected to the blower motor, and the register is driven by the blower motor. In a register device for controlling a blower that is air-cooled by a blower, the resistor is constructed by incorporating a resistor into a resistor holding member, providing a heat dissipation member on the resistor holding member, and extending from the resistor holding member. It is constructed by fixing a connecting terminal to a position close to the resistor holding member of the extended resistor terminal with a repulsive force against the resistor terminal via a temperature fuse. Therefore, since the resistor that becomes the heat generating element is incorporated into the resistor holding member, the resistor device for controlling the blower is difficult to rise to the ignition temperature due to the heat generated by the resistor. Since the resistor terminal is fixed to the resistor terminal through the temperature fuse at a position close to the member, the temperature fuse easily melts and the connecting terminal immediately separates from the resistor terminal due to the repulsive force and disconnects the power supply. Since the circuit is turned off, the resin materials of the air conditioner will not ignite and cause a fire. In addition, the structure is configured so that a repulsive force is applied to the connection terminal side, which has a high degree of freedom in material selection, and the connection terminal is fixed to the resistor terminal via a temperature fuse, so the connection terminal can be made of a material with good elasticity. This has the advantage that fires and other accidents do not occur due to delays in shutting off the power supply circuit due to deterioration of repulsive force over time.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a register device for controlling a blower according to an embodiment of the present invention, Fig. 2 is a plan view of the same ceramic register, Fig. 3 is a view taken in the direction of arrow A in Fig. 1, and Fig. 4 is a FIG. 4 is a working state diagram of the connection terminal in FIG. 3; 1... Resistor device for blower control, 2... Resistor, 2a... Terminal of resistor, 3... Ceramic substrate (resistance mounting member), 7... Resistor, 1
0... Connection terminal, 15... Temperature fuse.

Claims (1)

[Scope of utility model registration request] A register device for controlling a blower, in which a register for controlling the speed of the blower motor is connected to a blower motor, and the register is air-cooled by a blower driven by the blower motor, wherein the resistor is attached to a resistor holding member. A resistor is incorporated, and a heat dissipation member is provided on the resistor holding member, and a connection terminal is connected to a terminal of the resistor at a position close to the resistor holding member and a terminal of the resistor extending from the resistor holding member. A resistor device for controlling a blower, characterized in that it has a repulsive force against air and is fixed via a temperature fuse.