JPH0125686Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a vehicle air conditioner that includes a resistor that is connected in series to a blower for introducing air and controls the current flowing through the blower.

[Conventional technology]

In general, a vehicle air conditioner has a blower 3 that introduces air outside the vehicle or air 1 inside the vehicle into a duct 2, as shown in FIGS. 5 and 6. The air is cooled by an evaporator (not shown), heated by a heater core, the mixture ratio of cold air and warm air is adjusted by an air mix door, and then blown into the vehicle interior through a mode switching door.

The blower 3 is connected to a first fuse F from a power source B.
1. It is controlled by the current passing through the power switch SW, the second fuse F2, and the variable resistance section 4. By adjusting the variable resistance section 4 and setting its resistance value in three steps, the rotation speed can be set in three steps. be done.

The variable resistance section 4 includes a series circuit S of resistors R1, R2, terminals 4c, 4d, 4e drawn out from both ends of each resistor R1, R2, and terminals 4c, 4d, 4e.
The terminal 4 of the movable contact 4a consists of a movable contact 4a that comes into contact with the ground, and a common contact 4b that is connected to ground.
The resistance value of the series circuit S changes by changing the abutting positions on the contacts c, 4d, and 4e. For example, when the movable contact 4a is brought into contact with the terminal 4c, the series circuit S
The resistance value becomes 0 and the blower 3 becomes high speed, and when it comes into contact with the terminal 4d, the resistance value becomes medium and the speed becomes medium speed, and when it comes into contact with the terminal 4e, the resistance value increases and the speed becomes slow. becomes.

Note that the fuse F1 blows out based on an overcurrent, and the fuse F2 blows out when the detected temperature becomes higher than a set value, and this fuse F2 is located near each of the resistors R1 and R2.

Conventionally, the above-mentioned resistors R1 and R2 are
As disclosed in Japanese Utility Model Publication No. 49-14378, the lead wires l, l, l are installed by being bridged between the lead wires l, l, l, which are implanted in the fixing plate 5 so as to protrude inwardly of the duct 2. There is. By doing this, each of the resistors R1 and R2 is cooled by the air 1, so that accidents such as a fire caused by the heat generation of the resistors R1 and R2 can be prevented.

[Problem that the invention attempts to solve]

However, according to such a configuration, the resistors R1,
The heat generated in R2 is only cooled by the air 1, and a sufficient cooling effect cannot be obtained, and this becomes an important problem when the blower operates at a low speed. Further, there was also a risk that the dust mixed in with the air 1 would ignite.

This invention aims to solve the above problems.

[Means to solve the problem]

In order to solve the above-mentioned problem, this invention has a configuration in which an insulating plate extending parallel to the inner surface of the duct is installed inside the duct housing the blower, and a resistor is attached to the surface of the insulating plate.

[Effect]

Since the vehicle air conditioner of this invention has the above-mentioned configuration, the resistor is cooled by the air and heat is radiated through the insulating plate.
sufficiently cooled. In addition, since the dust flowing in with the air is less likely to adhere to the flat resistor, there is no problem of igniting the dust.

〔Example〕

An embodiment of this invention will be described below in detail with reference to the drawings.

Figure 1 is a side sectional view of a duct according to an embodiment of this invention, Figure 2 is an enlarged cross-sectional view of Figure 1, and Figure 3 is an enlarged cross-sectional view of Figure 1.
The figure is an exploded perspective view of FIG. 2.

In these figures, 1 is the introduced air, 2 is the duct, 3 is the blower, and 5 is the hole 6 formed in the duct 2.
a fixing plate attached to the duct so as to block the
11 is an insulating plate made of ceramic that is provided in the duct and extends parallel to the duct inner surface 7; 11 is a lower heat sink fixed to the upper surface of the fixed plate 5 and on which the insulating plate 10 is attached; 11a is this lower heat sink; The fins 12 of the heat sink are an upper heat sink attached to the upper surface 10a of the insulating plate 10 via a thin insulating plate 13 made of mica or the like, and the fins 12a are the fins of the upper heat sink.

In this embodiment, the upper and lower heat sinks 11 and 12 are made of aluminum.

On the upper surface 10a of the insulating plate are a fixed terminal 14 of the lead wire l1 connected to the motor 3, a fuse F2 including a conductive wire 13a, and a fixed terminal 1 of the lead wire l2 connected to the contact 4c of the variable resistance section 4.
4c, first resistor R1, fixed terminal 14d of lead wire l3 connected to contact 4d, second resistor R2,
A fixed terminal 14e is provided for a lead wire l4 connected to the contact 4e.

In this embodiment, the fuse F2 is provided in a groove 15 provided in the insulating plate 10, as shown in FIG.
One end of the conductive wire 13a is fixed to an insulating plate via a first terminal 13b made of solder, rivets, etc. that does not easily melt at high temperatures, and the other end is fixed to the insulating plate via a second terminal 13c that easily melts at high temperatures. fixed and second
The conductive wire 13a is configured to have elasticity so that it separates from the second terminal 13c when the terminal 13c melts at a predetermined temperature. Also, the first and second resistors R1, R2
was formed by depositing an alloy of chromium and nickel, iron, or copper by vapor deposition or sputtering.

Said terminals 14, 14c, 14d, 14
The resistor e was deposited and formed at the same time as the resistors R1 and R2. and first and second resistors R1, R2, conductive wire 1
3a are connected in series, the lead wire l1 is connected to the wiring from the motor 3, the lead wire l2 is connected to the contact 4c of the variable resistance section 4, and the lead wire l3 is connected to the contact 4d.
Then, the lead wire l4 was connected to the contact point 4e. Therefore, by bringing the movable contact 4a into contact with each terminal 4c, 4d, 4e, multi-step resistance values can be obtained, and when the temperature of the resistors R1 and R2 rises for some reason, the second terminal 13c melts and the conductive wire is removed, cutting off the current path and ensuring safety.

[Effect of idea]

According to this invention, an insulating plate extending parallel to the inner surface of the duct is installed in the duct housing the blower, and the above-mentioned resistor is attached to the surface of the insulating plate, so that the resistor is cooled by air. At the same time, heat can be radiated through the insulating plate, improving the cooling effect. Furthermore, since the resistor is coated and formed flat, the dust that flows in with the introduced air will not stick to it, which, together with the above-mentioned improved cooling effect, will cause problems such as ignition of dust, etc. Never.

When heat dissipation plates are provided on both the front and back surfaces of the insulating plate as in the embodiment, the cooling effect is further improved and there is no possibility that dust or the like will adhere to the resistor.

[Brief explanation of the drawing]

Figure 1 is a side sectional view of a duct according to an embodiment of this invention, Figure 2 is an enlarged cross-sectional view of Figure 1, and Figure 3 is an enlarged cross-sectional view of Figure 1.
The figure is an exploded perspective view of figure 2, figure 4 is fuse F2
FIG. 5 is an illustration of a rotation speed control circuit of a blower, and FIG. 6 is a side cross-sectional view of a conventional duct. 1...Introduced air, 2...Duct, 3...Blower, 5...Fixing plate, 7...Inner surface of duct, 10...
Insulating plate, 11, 12... Heat sink, 11a, 12a
...fin, 13a...conductive wire, 13b...first
Terminal, 13c...Second terminal, R1, R2...Resistor.

Claims (1)

[Claims for Utility Model Registration] (1) In a vehicle air conditioner equipped with a resistor that is connected in series to a blower for introducing air and controls the current flowing through the blower by short-circuiting or opening both ends thereof. An air conditioner for a vehicle, characterized in that an insulating plate extending parallel to the inner surface of the duct is installed in a duct housing a blower, and the above-mentioned resistor is coated on the surface of the insulating plate. (2) The air conditioner for a vehicle according to claim 1, wherein the insulating plate is attached to the inner surface of the duct via fins. (3) The air conditioner for a vehicle according to claim 1, wherein the insulating plate is sandwiched between heat sinks having fins. (4) The air conditioner for a vehicle according to claim 1, wherein the insulating plate is made of ceramic. (5) The vehicle air conditioner according to claim 1, wherein the resistor is formed by depositing an alloy of chromium and nickel, iron, or copper by vapor deposition or sputtering. (6) One end of the conductive wire is fixed to the insulating plate through a first terminal such as solder or rivet that does not easily melt at high temperatures, and the other end is fixed to the insulating board through a second terminal that easily melts at high temperatures. and the conductive wire is given elasticity in a direction away from the second terminal, and the conductive wire is connected in series to the resistor via the first and second terminals. The vehicle air conditioner described.