JPH0436882B2 - - Google Patents

Description

Detailed Description of the Invention "Industrial Application Field" The present invention has an air mix door that opens and closes a cold air flow path to control the amount of air flowing into the heater core.
The present invention relates to an air conditioner for an automobile that can be adjusted to a bilevel state in which cool air that has bypassed a heater core is blown toward the head and warm air that has passed through the heater core is blown toward the feet.

``Prior Art'' As a conventional air conditioner for automobiles, there is one disclosed in the Nitsusan Sunny Maintenance Manual (1981 edition) Air Conditioner Edition and is shown in FIG. 3, for example.

That is, the housing 20 of the air conditioner 10
The heater core 11 is disposed below the middle part of the flow path 21 inside, and the upper side of the flow path 21 forms a cold air flow path 22. An air mix door 12 for opening and closing the cold air flow path 22 is located at the rear end of the heater core 11. A vent outlet 23, a foot outlet 24, and other outlets not shown are provided at the rear of the flow path 21, and a vent door 13 and a floor door 14 are provided, respectively.

In FIG. 3, the air conditioner 10 is adjusted to a bilevel state, and the cold air that has passed through the cold air flow path 22 and bypassed the heater core 11 is blown out from the vent outlet 23 toward the driver's vehicle or the passenger's head. On the other hand, warm air is blown out from the foot outlet 24 toward the feet, creating a comfortable condition with a cold head and warm feet.

However, when using such a conventional air conditioner 10 in a bilevel state during cold seasons, the air mix door 12 must be operated to fully close the cold air passage 22, as shown by the imaginary line in FIG. As a result, there is no cold air passing through the cold air flow path 22, and warm air blows out from the vent outlet 23, making it impossible to create a cold head and feet condition, and the bilevel state may not be able to create the desired state. There was a problem with this.

``Object of the Invention'' The present invention has been made by focusing on the above-mentioned conventional problems, and when used in a bi-level state, the above-mentioned problems are solved by ensuring that cold air is always blown out from the vent outlet. The purpose is to provide an air conditioner for automobiles that solves the following problems.

"Structure of the Invention" In order to achieve the above object, the present invention has an air mix door that opens and closes an air flow path to control the amount of air flowing into the heater core, and has a vent state in which the air is blown out from the vent outlet. A car that can be adjusted to each state: a heat state where wind is blown out from the foot vents, a bi-level state where cold air that has bypassed the heater core is blown out from the vent vents toward the head, and warm air that has passed through the heater core is blown out from the foot vents toward the feet. A cold air bypass section provided near the air mix door, an opening/closing door for opening and closing the cold air bypass section, a level detection means for detecting whether or not the state of the air outlet is in a bilevel state, and a level detection means for detecting whether the state of the air outlet is in a bilevel state, and a cold air bypass section provided near the air mix door; fully closed detection means for detecting a fully closed state; and when the level detection means detects a bilevel state and the fully closed state detection means detects that the air mix door is fully closed to completely close the cold air flow path; The air conditioner for an automobile is characterized by being provided with a switching means for opening an opening/closing door and keeping the opening/closing door in a closed state at other times.

When the air conditioner is used in a bilevel state and the air mix door fully closes the cold air flow path, and the level detection means and the fully closed detection means detect this, the switching means opens the opening/closing door to the open state. The switching means maintains the opening/closing door in the closed state so that the cold air is blown out from the vent outlet through the cold air bypass section, and at other times, the switching means keeps the opening/closing door closed so that the cold air does not flow.

“Embodiment” An embodiment of the present invention will be described below based on the drawings. Note that the same parts as in the conventional example are given the same reference numerals and redundant explanations will be omitted.

FIG. 1 shows an embodiment of the present invention, in which an outside air intake port 25 and a cold air intake port 26 are opened at the front of a housing 20 of an air conditioner 10, and an evaporator 15 is installed in the cold air intake port 26. An outside air switching door 16 is connected to a built-in cooling unit 27 and switches intake air between an outside air intake port 25 and a cold air intake port 26.
is provided. A blower 17 is provided behind the outside air switching door 16.

A cold air bypass portion 30 is formed by widening the wall of the housing 20 that forms the cold air passage 22 near the air mix door 12. In the cold air bypass section 30, an opening 31 is open toward the cold air passage 22, and an air mix door 1 is located approximately in the center of the opening 31.
An abutment receiving part 32 at the tip of No. 2 is installed. The inlet 3 is located between the contact receiving portion 32 and the front end of the opening 31.
3, and an outlet 34 is formed between the abutment receiving portion 32 and the rear end of the opening 31.

An opening/closing door 35 is pivotally supported at the front end of the opening 31 of the cold air bypass section 30, and a driving rod 36a of a solenoid 36 is connected to the opening/closing door 35. A bilevel switch 37 and an adjustment state detection switch 38 are connected to the solenoid 36 in series with a power source 39.

FIG. 2 shows the operation panel 40 of the air conditioner 10, and the upper part of the operation panel 40 is provided with a mode knob 41 that can be operated by moving horizontally.
A temperature control knob 42 that is similarly operated by moving horizontally is provided at the bottom. The bi-level switch 37 is turned on when the mode knob 41 is at the bi-level position indicated by B/L, and when the temperature control knob 42 is at the HOT position at the right end in the figure, the tip of the air mix door 12 touches the abutting part 32. The adjustment state detection switch 38 is set to be turned on when the cold air passage 22 is fully closed by contact.

The bi-level switch 37 is a level detection means for detecting whether or not the bi-level state is present.
The adjustment state detection switch 38 is the air misc door 1.
This is a fully closed detection means for detecting the fully closed state of No. 2. The solenoid 36 and the drive rod 36a are connected to the cold air bypass section when the level detection means detects a bi-level state and the fully closed detection means detects that the air mix door is fully closed to completely close the cold air passage. A switching means is configured to open the opening/closing door and to close the opening/closing door at other times.

In the air conditioner 10 having the above configuration, when the mode knob 41 is at the bi-level position and the temperature setting knob 42 is at the HOT position, the tip of the air mix door 12 is connected to the opening 31 as shown by the solid line in FIG. are in contact and completely close the cold air flow path 22,
Both the bilevel switch 37 and the adjustment state detection switch 38 are turned on.

Since the bilevel switch 37 and the adjustment state detection switch 38 are on, the solenoid 36
A current flows through the opening/closing door 35, and the opening/closing door 35 is held at the position shown in solid line in FIG. 1, where the inlet 33 is open.

In this state, most of the air flowing toward the cold air passage 22 passes through the heater core 11, but some air enters the cold air bypass section 30 from the inlet 33, flows out from the outlet 34, and continues to blow into the vent. It is blown out from the outlet 23.

Therefore, the warm air that has passed through the heater core 11 is blown out from the foot air outlet 24, and the cold air is blown out from the vent air outlet 23, so that the lower body of the driver or the passenger is warmed, and the head is cool and the feet are warm. Although the amount of cold air is small, since it is used in such conditions when it is quite cold, even a small amount can cool the head side.

When the mode knob 41 is not at the bi-level position, the bi-level switch 37 is off, so no current flows through the solenoid 36 and the opening/closing door 35 closes the inlet 33.

At this time, if the temperature control knob 42 is in the HOT position, no air will pass through the cold air bypass section 30, all the air will pass through the heater core 11, and warm air will flow from both the vent outlet 23 and the foot outlet 24. The air is blown out, providing maximum heating effect during the coldest months.

Furthermore, when the mode knob 41 is not in the bi-level position and the temperature control knob 42 is not in the HOT position, the cold air passage 22 opens according to the opening angle of the air mix door 12, so that cold air does not pass through the cold air passage 22. The heated air is mixed with the warm air that has passed through the heater core 11 and is blown out from the vent outlet 23 or the foot outlet 24.

Even if the mode knob 41 is at the bi-level position, if the temperature adjustment knob 42 is not at the HOT position, the adjustment state detection switch 38 is off and no current flows through the solenoid 36, so the opening/closing door 35 is closed. The entrance 33 is closed. The air mix door 12 does not completely close the cold air flow path 22, and the air is divided according to the position of the air mix door 12 into cold air that has passed through the cold air flow path 22 and warm air that has passed through the heater core 11. Cold air is blown out from the foot outlet 24.
Warm air is blown out.

Note that when the air mix door 12 does not completely close the cold air passage 22, cold air can pass through the cold air passage 22 regardless of whether the cold air bypass section 30 is opened or closed. Since it only affects the flow rate, the opening/closing door 35 should open the inlet 33 at least when the mode knob 41 is at the bi-level position.

Further, the cold air bypass section 30 is connected to the housing 20.
Although the example is shown in which the wall is widened, a completely different flow path may be provided.

"Effects of the Invention" According to the automotive air conditioner according to the present invention,
When in the bi-level state, even if the cold air flow path is completely closed by the air mix door, the cold air bypass section allows cold air to be blown out from the vent outlet, making it possible to create a comfortable condition with a cold head and warm feet under any circumstances. This allows the driver to drive calmly without feeling confused, and the passengers to keep their heads clear.

[Brief explanation of drawings]

1 and 2 show an embodiment of the present invention, in which FIG. 1 is a schematic vertical sectional view of an air conditioner, FIG. 2 is a partial front view of an operation panel, and FIG. 3 is a conventional FIG. 2 is a schematic vertical cross-sectional view of an air conditioner. 10...Air conditioner, 11...Heater core,
12... Air mix door, 20... Housing, 21... Channel, 22... Cold air channel, 23...
Vent outlet, 24... Foot outlet, 30... Cold air bypass section, 33... Inlet, 34... Outlet, 35... Opening/closing door, 36... Solenoid, 3
7... Bi-level switch, 38... Adjustment state detection switch.

Claims (1)

[Scope of Claims] 1. It has an air mix door that opens and closes the air flow path to control the amount of air flowing into the heater core, and has a vent state in which the air is blown out from the vent outlet, a heat state in which the outflow air is blown out from the foot outlet, and This is installed near the air mix door in an automotive air conditioner that can be adjusted to a bilevel state in which cool air that has bypassed the heater core is blown out from the vent outlet toward the head side, and warm air that has passed through the heater core is blown out from the foot outlet to the foot side. a cold air bypass section, an opening/closing door for opening and closing the cold air bypass section, a level detection means for detecting whether the state of the air outlet is in a bi-level state, and a fully closed detection means for detecting whether the air mix door is fully closed. , when the level detecting means detects a bi-level state and the fully closed detecting means detects that the air mix door is fully closed and the cold air flow path is completely closed, the opening/closing door is set to an open state, and the other 1. An air conditioner for an automobile, comprising a switching means for closing the opening/closing door.