JPH0125687Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a device for controlling the rotation of a blower used in an automobile air conditioner.

(Prior Art) A conventional blower control device, as shown in Utility Model Application Publication No. 54-156950, has heat dissipation plates attached to both ends of a resistor, and the resistor and heat dissipation plate are placed together in an air conditioning case. The heat generated from the register was dissipated into the blown air inside the air conditioning case through the heat sink.

(Problem to be solved by the invention) However, in conventional blower control devices, the resistor is installed in the air passage of the air conditioning case together with the heat sink, so if the resistor breaks down, it must be removed from the air conditioning case. In the worst case scenario, the air conditioning case itself would have to be removed, which was not only troublesome but also difficult to perform maintenance. Another drawback is that the lead wire of the resistor cannot be easily pulled out from inside the air conditioning case when the resistor is installed.

Therefore, in this invention, the purpose of this invention is to improve the mounting structure of the register and heat sink provided in the air conditioning case, and to provide a blower control device for an automobile air conditioner that can be easily maintained and the lead wire drawn out. There is.

(Means for solving the problem) However, the gist of the blower control device in this invention is to have a heat dissipation plate with fins standing upright in front of the mounting part, and a metal thin film resistor in front of the board. and a resistor with a resistor attached thereto, the mounting portion of the heat sink is attached to the air conditioning case so that the fin protrudes into the air passage in the air conditioning case from an insertion hole formed in the air conditioning case, and The resistor is attached to the mounting portion of the heat sink so that the back surface of the substrate of the register is in close contact with the back surface of the mounting portion.

(Function) Therefore, to install the blower control device, insert the fins formed on the front side of the mounting part of the heat sink into the insertion holes formed in the air conditioning case from the outside, and fix the mounting part to the air conditioning case. As a result, the blower control device can be easily installed and removed, and the lead wires connected to the register can be pulled out without going through the air conditioning case, thus achieving the above object.

(Embodiment) In FIG. 2, the automobile air conditioner is constructed by connecting a blower unit 1, an evaporator unit 2, and a heater unit 3. In the blower unit 1, a fan 5a of a blower 5 is housed in a first air conditioning case 4 made of resin. Blower 5
A motor 5b is connected to the fan 5a, and the fan 5a rotates in response to energization of the motor 5b.
An inside air inlet 6 and an outside air inlet 7 are formed in the first air conditioning case 4 on the inlet side of the blower 5, and an inside/outside air switching door 8 for selectively opening and closing the inside air inlet 6 and the outside air inlet 7 is provided. It is being The evaporator unit 2 includes an evaporator 10 housed in a second air conditioning case 9 also made of resin. The heater unit 3 also has a heater core 12 in a third air conditioning case 11 also made of resin.
An air mix door 13 is provided in front of the heater core 12, and an air outlet 14 is formed in the third air conditioning case 11. Thus, an air passage 15 is formed by the first to third air conditioning cases 4, 9, and 11, and air introduced into the air passage 15 from the inside air inlet 6 or the outside air inlet 7 by the rotation of the blower 5 is transferred to the evaporator. 12 and air mix door 13
The air is divided into those that pass through the heater core 12 and those that bypass the heater core 12 depending on the opening degree of the air, and are later mixed and blown into the vehicle interior through the air outlet 14.

The blower control device 16 is attached, for example, to the outlet portion of the first air conditioning case 4, and a specific example of the blower control device 16 is shown in FIG.

In FIG. 1, the blower control device 16 is composed of a heat sink 17, a register 18, and a cover 19. The entire heat dissipation plate 17 is made of, for example, an aluminum alloy, and as shown in FIG.
1 are installed in parallel in parallel. Screw insertion holes 22 are formed at both ends of the mounting portion 20, and the cover 19 is inserted through screws 23 inserted into the screw insertion holes 22.
It is also attached to the outer wall of the air conditioning case 4. The fins 21 protrude into the air passage 15 through insertion holes 24 formed in the air conditioning case 4.

As shown in FIG. 6, the resistor 18 includes, for example, two metal thin film resistors 26a and 26b deposited on the front surface of a ceramic substrate 25. In this resistor 18, the back surface of the substrate 25 is adhesively fixed to the back surface of the above-mentioned heat sink 17 via, for example, silicone rubber. The resistors 26a, 26b
is made of components such as nickel, chromium, and tantalum, as is known from, for example, Japanese Patent Application Laid-Open No. 60-27103. Further, first to third terminals 27a to 27c are similarly deposited near the end of the substrate 25. As shown in FIG. 7, one end of the one resistor 26a is connected to the first terminal 27a, the other end is connected to one end of the other resistor 26b and the second terminal 27b, and the other end is connected to the other resistor 26b. The other ends are connected to third terminals 27c via temperature fuses 28, respectively. Further, the first to third terminals 27a to 27c are connected to lead wires 29a to 29a, which are drawn out through grooves 30 formed in the cover 19.
29c is connected and inserted into the blower drive circuit.

That is, as shown in FIG. 7, the blower driving device is composed of a power source 31 consisting of a battery, a blower switch 32, the register 18, and the motor 5b. The blower switch 32 includes a movable contact 33 whose one end is connected to the power source 30, and first to fourth fixed contacts 34a to 34d. The first fixed contact 34a is not connected to anything, and the second fixed contact 34b is connected to the first terminal 27a of the resistor 18 via the lead wire 29a.
The third fixed contact 34c is connected to the second terminal 27b via the lead wire 29b, and the fourth fixed contact 34c is connected to the second terminal 27b via the lead wire 29b.
4d bypasses the resistor 18 and is connected to the third terminal 27c via a lead wire 29c together with one end of the motor 5b.

Therefore, the blower is operated by the blower switch 3.
When the movable contact 33 of No. 4 is connected to the first fixed contact 34a, the power to the motor 5b is cut off and it does not drive, and when it is connected to the second fixed contact 34b, the two resistors 26a and 26b are via motor 5
b is energized, so it rotates at low speed, and when connected to the third fixed contact 34c, the other resistor 26
Since the motor 5b is energized through the terminal b, it rotates at a medium speed, and when connected to the fourth fixed contact 34d, the motor 5b is energized without going through the two resistors 26a and 26b, so it rotates at a high speed. do.

As described above, when the blower switch 32 is set to low or medium speed, the resistor 26a of the resistor 18,
26b generates heat due to dicol heat, and the heat is transferred from the substrate 25 of the resistor 18 to the heat sink 17, and from the fins 21 of the heat sink 17 to the air passage 15.
The heat is radiated to the air flowing through it.

6 and 7 show other embodiments in which the shape of the heat sink 17 is changed. This heat sink 22
The fins 21 erected in front of the mounting part 20 are arranged in a figure-eight shape so that the width between the fins is narrower on the leeward side than on the windward side, and is higher on the leeward side than on the windward side. It is formed into a trapezoid shape. In such a shape of the heat sink 17,
As the air sent from the blower moves toward the leeward side of the fins 21, the speed increases, and at the same time, the mounting portion 2 of the heat sink 17
Flow gradually away from 0 (in the direction of the arrow in the figure)
Therefore, the heat of the heat sink 17 can be efficiently dissipated, which has the advantage that the heat sink 17 can be made smaller.

Note that the blower control device 16 may be attached not only to the first air conditioning case 4 but also to the second air conditioning case 9 and the third air conditioning case 11.

(Effects of the invention) As described above, according to this invention, the mounting portion of the heat dissipation plate having the fins erected on the front is arranged such that the fins protrude into the air passage through the insertion holes formed in the air conditioning case. The resistor, which is attached to the air conditioning case and has a metal thin film resistor attached to the front of the board, is attached so that the back side of the resistor is in close contact with the back side of the mounting part of the heat sink, making it easy to attach and detach to the air conditioning case and to reduce maintenance. This makes it easier. Also,
Since the resistor is attached to the back side of the attachment part of the heat sink, it does not take much time to draw out the lead wires of the resistor, and work efficiency can be improved.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing an embodiment of this invention, Figure 2 is a sectional view showing an embodiment of this invention.
The figure is a perspective view showing an automobile air conditioner, FIG. 3 is a perspective view showing the register of the blower control device, and FIG. 4 is a circuit diagram showing the connection state of the register in the same as above.
FIG. 5 is a perspective view showing the heat sink of the blower control device;
FIG. 6 is a plan view showing another embodiment, and FIG. 7 is a side view of the same. 4, 9, 11... Air conditioning case, 15... Air passage, 16... Blower control device, 17... Heat sink,
18... Register, 20... Mounting part, 21... Fin, 24... Insertion hole, 25... Board, 26a,
26b...Metal thin film resistor.

Claims (1)

[Claims for Utility Model Registration] 1. A heat sink comprising a heat dissipation plate having fins erected in front of the mounting portion, and a resistor having a metal thin film resistor attached to the front surface of a substrate, the mounting portion of the heat dissipation plate comprising: is attached to the air conditioning case so that the fins protrude into the air passage in the air conditioning case from an insertion hole formed in the air conditioning case, and the resistor is attached to the mounting portion of the heat sink and the resistor is attached to the back surface of the mounting portion. A blower control device for an automobile air conditioner, characterized in that the register is mounted so that the back side of a circuit board is in close contact with it. 2. The air conditioner for an automobile according to claim 1 of the utility model registration claim, characterized in that there are a plurality of fins and the width between the fins is narrower on the leeward side than on the windward side. Blower control device. 3. Blower control for an air conditioner for an automobile according to claim 2, wherein the fins are formed in a trapezoidal shape so that the height of the fins is higher on the leeward side than on the windward side. Device.