JPS62105402A - Resistor for speed control of automotive blower - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a speed control resistor for a blower, and particularly to a speed control resistor suitable for a blower used in an automobile air conditioning system.

[Technical Background of the Invention] As this type of speed control device, we have already filed a patent application in 1983.
No. 146172 discloses a resistor 2 made of a metal layer formed on an insulating substrate 1 as shown in FIGS. 9<a> and (b), and a terminal section for selecting the resistance value of the resistor 2. 2
proposed a resistor with a. This patent application 1986-14
In the resistor No. 6172, the resistor 2 itself is made of a low melting point alloy that melts due to overcurrent, or the resistor 2 is provided with a leaf spring 3 and a circuit-breaking temperature fuse 4 between the resistor 2 and the terminal portion 2a. This structure protects the circuit from Joule heat generated when excessive current flows through the resistor due to an abnormality such as motor lock or motor shimiting. 1, and even in normal operation, a current of several amperes flows through these resistors, and according to Jecole's law, these resistors have a current of a minimum of 10-odd watts to a maximum of 70 watts. Generates Joule heat. These heats increase the temperature of the insulating substrate and the ventilation duct 1.
It spreads to the terminal where it is attached to -, and the temperature at the end is also 1-
This may cause ignition of the main body of the air ventilator 1. For this reason, resistors must be equipped with heat dissipation means to dissipate this heat, but conventional resistors have no choice but to rely on the heat dissipation properties of the insulating base itself. Therefore, in order to improve heat dissipation, it is necessary to increase the size of the insulating substrate, but the size of the JIW resistor may be restricted due to the location of several combustible materials or the amount of air flow, and the resistor itself Increasing the resistance may reduce the reliability of the resistor by 1 in terms of vibration resistance.

[Object of the Invention] The present invention has been made in view of the problems of conventional resistors, and provides a resistor for controlling the speed of an automobile blower with improved heat dissipation characteristics. "1-1, and furthermore, the resistor for controlling the speed of a 7-degree automotive blower is provided with an IJl. 4. ``Structure of the Invention'' In order to achieve the following objects, 1.-2 A speed control resistor for an automobile blower according to the present invention. dry, with an insulated substrate.

C) A resistor made of a metal layer formed on an insulating board, a terminal portion for appropriately selecting the resistance value of the resistor, and a heat dissipation means for dissipating Joule heat generated by the resistor. Good 11. ＜ is on the surface resistor itself to prevent accidents caused by overcurrent between the resistor and the terminal.
- Protective means for the main unit: t. - The heat dissipation means is one or more heat sinks fixed to the insulating W plate, or is composed of a horizontal plate. The insulating V-plate itself has 4 or 'tM holes.

[Embodiments of the Invention] Next, a preferred embodiment of the present invention will be described with reference to the drawings.8 In Figs. The resistor 2 having a predetermined resistance value and the terminal portion 2a are formed on the surface of the plate by printing or the like. Resistor 2 and terminal part 2
A plate spring 3 is fixed at one end with a temperature fuse 4 as a protective means to prevent accidents caused by overcurrent. Furthermore, a peel sink 5 made of an aluminum plate serving as a heat dissipation means is fixedly held on the surface of the insulating substrate 1 opposite to the resistor surface by a fixing pin 7 via a thermally conductive insulator 6 such as silicone grease. In the resistor of the present invention configured as described above, Joule heat generated in the resistor 2 is conducted through the insulating substrate 1, transferred to the aluminum heat sink 5 via the silicone grease 6, and is radiated into the air. In addition, the thermal design of the sink 5 to the heater 1 is based on the Joule heat generated and the ventilation Doug 1-
It can be freely varied depending on the wind speed passing through it.

3 to 6 show other embodiments of the invention.

A plurality of heat sink plates 5 are attached. The resistor shown in FIGS. 3 and 4 is made by applying series 1 grease 6 to both sides of the resistor 4 of the insulating substrate 1. -2 The heat sink 5 is attached at 2 through a thin plate-shaped insulator 8, and silicon grease is applied to the back surface of the insulating substrate 1.
;The heat sink 5 is removed through the
Figure 5 shows an example in which both ends of the heat sinks 5 in Figure 4 are bent vertically to direct the space factor. During sexual contact, the n agent 9f1 is held fixed. Furthermore, Figure 6 shows a U-shaped formation Jl, taper 1, sink 5
Figure 7 is an example of 2 strings and 4 digits.
No. 82749/1; - This is an embodiment in which the resistor shown has several P1 to Sink 5 units. Jitsugan Sho 60-082749
No. J: The resistor shown in J is as shown in FIG. It is connected to 7.

FIG. 8 shows still another embodiment. In resistors 1 and 2, an enamel plate is used as the insulating substrate 1.
Several holes 1o are drilled near the terminals of the plate to prevent the heat from the resistor t from directly propagating, and the insulating base itself serves as a heat dissipation means.

[Effects of the Invention] As is clear from the following explanation, the speed control resistor for an automobile blower according to the present invention is provided with a means for quickly dissipating the Joule heat generated from the resistor, so that during normal operation. This suppresses the rise in temperature of the resistor at the terminal, prevents heat from propagating to the terminals, and improves safety. Furthermore, since the heat capacity can be increased even with a small insulating substrate, the space factor can be improved, and reliability can also be improved in terms of vibration resistance.

[Brief explanation of drawings]

1 and 2 are respectively a perspective view and a side view of an embodiment of a resistor for controlling the speed of an automobile blower according to the present invention, and FIGS. 3 and 4 are respectively a perspective view and a side view of an embodiment of a resistor for controlling the speed of an automobile blower according to the present invention. FIGS. 5 to 8 are a perspective view and a side view of another embodiment of the resistor for use in a motor vehicle, respectively, and FIG. a) and (b) are respectively plan views of embodiments of conventionally proposed speed control resistors, and FIG. 10 is a side view of another conventionally proposed speed control resistor. 1... Insulating board 2... Resistor 2a... Terminal section 3... Leaf spring 4... Temperature fuse 5... Heat sink 6...Thermally conductive insulator 7...Bin 8...Insulator 9...Heat-resistant adhesive 10...Hole agent Patent Attorney Moritani - Yuichi 〇 Figure 5 q Figure 7 Figure 8 Figure 9 (a) (b) 4 zpa2 Rino (\) End Figure 10 \ni a 5't

Claims (1)

[Scope of Claims] 1. An insulating substrate, a resistor made of a metal layer formed on the insulating substrate, a terminal portion for appropriately selecting a resistance value of the resistor, and radiating Joule heat generated by the resistor. A resistor for controlling the speed of an automobile blower, which has a heat dissipation means for controlling the speed of an automobile blower. 2. The automotive vehicle according to claim 1, characterized in that a protective means for preventing accidents caused by overcurrent is provided on the resistor itself or between the resistor and the terminal portion. Resistor for blower speed control. 3. The speed control resistor for an automobile blower according to claim 1 or 2, wherein the heat radiating means is one or more heat sinks fixed to the insulating substrate. 4. The speed control resistor for an automobile blower according to claim 1 or 2, wherein the heat dissipation means is the insulating substrate itself, which is made of a hollow plate and has one or more holes.