JPH0536722Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to an air conditioner for an automobile, particularly one equipped with a cool box.

Prior Art In an automobile, for example, as shown in FIG. 7, an evaporator 3 is installed downstream of a blower 2 housed in a duct 1, and a cool box (not shown) is installed downstream of the evaporator 3 in the duct 1. Alternatively, as shown in FIG. 8, a cool box 5 is placed adjacent to the downstream side of the evaporator 3.

There is also a cooling system in which the cool box part is partially bypassed and placed in the cooling passageway downstream of the evaporator (this similar structure was developed in September 1981, for example).
(as shown in Service Weekly Report No. 462, page 133, published by Nissan Motor Co., Ltd.).

Problems that the invention aims to solve Generally speaking, when it comes to air conditioners for automobiles,
A structure is adopted in which the rotation of the blower is controlled by various detection switches, but in the case of the type equipped with the above-mentioned cool box 5, the discharge air is controlled depending on the presence or absence of the object to be cooled 7 in the cool box 5. The temperature changes, and especially in cases where the cool box 5 is installed in multiple locations, the temperature of the discharge air tends to increase, resulting in insufficient cooling of the cooled items 7 in the cool box 5. The problem is that it invites

Therefore, this idea changes the rotation speed of the blower depending on the presence or absence of objects to be cooled in the cool box section.
An object of the present invention is to provide an air conditioner for an automobile that can maintain a cooled state of items in a cool box.

Means for Solving the Problem A cool box section is formed in the cooling passage downstream of the evaporator, and a detection switch for detecting the presence or absence of the cooled articles is provided in the cool box section. A control circuit is provided which reduces the rotational speed of the blower motor via a detection switch when an article is stored.

Function: When an article to be cooled is stored in the cool box section, the detection switch detects this and increases the cooling capacity by lowering the rotation speed of the blower motor via the control circuit.

Embodiment Hereinafter, an embodiment of this invention will be described in detail based on the drawings.

In FIGS. 1 to 4, 1 is a duct, 2 is a blower, and 3 is an evaporator provided in a cooling passage 4 downstream of the blower 2. A cool box portion 5 is formed downstream of the evaporator 3. There is.

Incidentally, the evaporator 3 constitutes a refrigeration cycle with a compressor, a condenser, an expansion valve, etc. (not shown).

The cool box section 5 has open front and rear side walls, and is formed on the cooling passage 4a side of the upper part of a partition plate 6 that divides the cooling passage 4 into upper and lower parts, and a cooling air passage 4b for the vehicle interior is secured at the lower part of the partition plate 6. has been done. A lid 8 is attached to the upper wall of the duct 1 facing the partition plate 6 for loading and unloading articles 7 to be cooled, such as jewelry.

A movable tray 10 is attached to the upper part of the partition plate 6 via a spring 9, and the movable tray 10 is attached to the lower surface of the movable tray 10 and the opposing upper surface of the partition plate 6 due to the weight of the cooling article 7. The contact 11a of the detection switch 11, which turns ON when the switch is lowered,
11b are arranged facing each other.

The detection switch 11 is connected to a control circuit 12 that reduces the rotational speed of the blower 2 when the detection switch 11 is turned on.

In the control circuit 12, when the article 7 to be cooled is not stored in the cool box section 5, the relay 13 is switched to the F side, and the blower motor 15 is driven by the operation of the fan switch 14. The blower 2 is rotated steadily, but when the object to be cooled 7 is stored in the cool box 5, the relay 13 is switched to the N side by the ON operation of the detection switch 11, and the voltage is reduced through the resistor 16 for reducing the voltage of the blower motor 15. The blower motor 15 is rotated.

According to the structure of the above embodiment, the cool box part 5
If the article 7 to be cooled is not stored in the
The cooling air that has passed through the evaporator 3 passes through the cooling passage 4 and enters the cooling passage 4a in the cool box section 5.
and the vehicle interior cooling passage 4b, and is discharged into the vehicle interior from various outlets (not shown).

On the other hand, in order to use the cool box section 5, when the lid 8 is opened and the article 7 to be cooled is placed on the movable tray 10, the movable tray 10 resists the spring.
is lowered, contacts 11a and 11b attached to the movable tray 10 and the partition plate 6 are connected, and the detection switch 11 is turned on. Then, relay 13 becomes N.
As a result, a resistor 16 is interposed between the blower motor 15 and the fan switch 14, and the rotational speed of the blower motor 15, which had been rotating steadily until then, decreases.

When the rotational speed of the blower motor 15 decreases in this way, the heat exchange rate in the evaporator 3 increases and cooling air at a lower temperature can be obtained, so that the objects to be cooled 7 are reliably cooled and the air blown into the vehicle is reduced. Temperature rise can be prevented.

Note that, as shown in FIG. 4, the air volume and the blowing temperature are in a relationship such that the blowing temperature increases as the air volume increases.

Of course, the above-mentioned cooling effect can be exerted whether the fan switch 14 is in the Lo position or the Hi position.

Then, when the article 7 to be cooled is taken out, the detection switch 11 is turned OFF, and the relay 13 is turned OFF.
As a result, the resistance 16 is removed, and the blower motor 15 returns to its normal rotational speed and rotates the blower 2, thereby providing normal air conditioning.

Next, in the embodiment shown in FIGS. 5 and 6, the resistor 16 in the above-described embodiment is configured as a variable resistor 16a, and is arranged as an adjustment dial 17 on the operation panel in the vehicle interior.

In this embodiment, the adjustment dial 17
That is, by changing the resistance value with the variable resistor 16A, the adjustment dial 17 is adjusted so that the resistance value of the variable resistor 16A increases when a large number of objects 7 to be cooled are stored. This has the advantage that the optimum cooling condition can be freely set.

Effects of the invention As explained above, according to this invention, the presence or absence of objects to be cooled in the cool box section is automatically detected, and the rotation speed of the blower is changed to maintain the cooling state of the objects to be cooled. This has a great practical effect.

[Brief explanation of the drawing]

Figures 1 to 6 show an embodiment of this invention, Figure 1 is a cross-sectional view taken along the - line in Figure 3, Figure 2 is a control circuit diagram, Figure 3 is an explanatory overall cross-sectional view, and Figure 4 is a cross-sectional view of the invention. 5 is a schematic diagram showing a variable resistor of another embodiment, FIG. 6 is a front view of the adjustment dial, and FIGS. 7 and 8 are perspective views of the prior art. 3... Evaporator, 4... Cooling passage, 5...
Cool box section, 7... Article to be cooled, 11...
Detection switch, 12... Control circuit, 15... Blower motor.

Claims (1)

[Scope of utility model registration request] A cool box portion is formed in the cooling passage downstream of the evaporator, and this cool box portion includes
A detection switch for detecting the presence or absence of an article to be cooled is provided, and a control circuit is provided to reduce the rotation speed of the blower motor via the detection switch when the article to be cooled is stored in the cool box section. Automotive air conditioner.