JP2000071743A - Air conditioning apparatus for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease the number of parts so as to miniaturize the air conditioning unit by abolishing a special backflow prevention door. SOLUTION: In this apparatus, a connection link 16 that movably connects a cold air bypass door 12 and a hot air shutoff door 13 is provided. A pin 16b provided in the connection link 16 moves inside a link groove 17 provided to the hot air shutoff door 13. This allows relative movement between the pin 16b and the link groove 17, the hot air shutoff door 13 can be moved within the range of the relative movement. The hot air shutoff door 13 opens by application of the wind pressure of ventilation air passing a hot air passage 15 toward the face blowout port. In this case, if the face blowout port is closed with the cold air bypass door 12 kept open, the hot air shutoff door 13 is applied with reverse wind pressure to close the hot air passage 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for a vehicle which can change a face blowing temperature from a set temperature to a maximum cooling temperature.

[0002]

2. Description of the Related Art As a prior art, there is an air conditioning unit shown in FIG. This air conditioning unit includes a cool air bypass door 100 and a hot air shut door 110 that can change the FACE blowout temperature from a set temperature to a maximum cooling temperature. The cool air bypass door 100 opens and closes a cool air passage that bypasses the heater core 120.
When 0 opens the cool air passage, a part of the cool air cooled by the refrigerant evaporator 130 can flow directly to the FACE outlet through the cool air passage without passing through the heater core 120.

[0003] The hot air shut door 110 is connected to the heater core 1.
The hot air heated at 20 opens and closes a hot air passage flowing to the FACE outlet, and is linked with the cold air bypass door 100. However, when the cold air bypass door 100 closes the cold air passage, the hot air shut door 110 opens the hot air passage, and when the cold air bypass door 100 opens the cold air passage, the hot air shut door 110 operates to close the hot air passage. The cold air bypass door 100 and the hot air shut door 110
As the degree to which the cool air bypass door 100 opens the cool air passage increases (therefore, the degree to which the warm air shut door 110 closes the warm air passage increases), the amount of cool air bypassing the heater core 120 increases and the FACE blow-out temperature decreases. be able to.

[0004]

However, in the above-described air conditioning unit, when both the cool air bypass door 100 and the hot air shut door 110 are open and the FACE outlet is closed by changing the outlet mode, for example, the refrigerant evaporates. A part of the cool air cooled by the air heater 130 flows backward from the cool air passage to the warm air passage, and is discharged to another outlet (for example, FOOT outlet, DE).
There is a problem that the outlet temperature of the (F outlet) decreases. In order to solve this problem, a backflow prevention door 140 for preventing the backflow of the cool air is conventionally provided. The backflow prevention door 140 is movable by wind pressure. When the FACE outlet is open, as shown in FIG. 4, the backflow prevention door 140 is opened by receiving the wind pressure of the blowing air flowing toward the FACE outlet. When the FACE air outlet is closed, as shown in FIG. 5, it is closed by receiving a reverse wind pressure, thereby preventing the backflow of the cool air.

As described above, in the conventional air-conditioning unit, the exclusive backflow prevention door 140 for preventing the backflow of the cool air is used, so that the number of parts increases and the space for installing the backflow prevention door 140 is increased. This necessitates an increase in the size of the air conditioning unit. The present invention
An object of the present invention is to provide an air conditioner for a vehicle which can reduce the number of parts and realize a downsized air conditioning unit by eliminating a dedicated backflow prevention door. is there.

[0006]

(Means for Solving the Problems) A connecting means for movably connecting the cold air bypass door and the hot air shut door is provided. When the cold air bypass door operates in the opening direction, the connecting means operates the hot air shut door in the closing direction, and when the cold air bypass door operates in the closing direction, the blowing air flowing toward the face air outlet through the hot air passage. The hot air shut door can be operated in the opening direction by the pressure of, and when the hot air shut door receives the reverse wind pressure, the hot air shut door can be closed regardless of the opening position of the cool air bypass door. I do.

With this connecting means, when the face outlet is open, the hot air shut door can be operated in conjunction with the cold air bypass door. That is, as the opening of the cold air bypass door is increased, the opening of the warm air shut door can be reduced. Thus, the outlet temperature of the face outlet can be changed from the set temperature to the maximum cooling temperature. Also, when you close the face outlet,
Reverse wind pressure (wind pressure acting in the direction to close the hot air shut door) is applied to the hot air shut door. At this time, irrespective of the opening position of the cool air bypass door, the warm air shut door closes, so that part of the cool air cooled by the refrigerant evaporator flows backward from the cool air passage through the warm air passage to another outlet. Flow can be prevented.

(Means of Claim 2) The connecting means is provided on a pin which moves following the movement of one of the cold-air bypass door and the hot-air shut door, and is provided on the other door, and is connected to the pin. When the cold air bypass door is fully open, the relative movement between the pin and the link groove is disabled, the hot air shut door is restricted to the fully closed position, and the cold air bypass door operates in the direction to close from the fully open position Then, the relative movement between the pin and the link groove becomes possible, and the hot air shut door moves within the movable range. According to this connecting means, the hot air shut door moves within the movable range of the pin and the link groove, regardless of the opening position of the cold air bypass door. A shut door can close the hot air passage.

[0009]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a unit sectional view showing a cold air bypass door and a hot air shut door. As shown in FIG. 3, the vehicle air conditioner of this embodiment includes an air conditioner unit 2 in which a blower 1 is integrated. The air conditioning unit 2 has a blower case 3 that supplies blown air into the vehicle interior. The blower case 3 includes blowers (DEF blower 4, FACE blower 5, rear FACE blower 6, FOOT blower 7, rear FOOT) for supplying the air sent from the blower 1 into the vehicle interior.
An outlet 8) and an outlet door for opening and closing the outlet (only the FACE door 9 is shown in FIG. 3) are provided.

[0010] Inside the blower case 3, a refrigerant evaporator 1 is provided.
0, a heater core 11, a cold air bypass door 12, a warm air shut door 13, and the like. Refrigerant evaporator 10
Cools blast air (air passing through the refrigerant evaporator 10) by heat exchange with a low-temperature refrigerant flowing inside. The heater core 11 is disposed downstream (downwind) of the refrigerant evaporator 10 in the blower case 3 and heats blown air (air passing through the heater core 11) by heat exchange with hot water (engine cooling water) flowing inside. A hot water pipe (not shown) for supplying hot water to the heater core 11 is provided with a flow control valve (not shown) for adjusting the amount of hot water, and the flow control valve controls the temperature of the blown air.

As shown in FIG. 1, the cool air bypass door 12 opens and closes a cool air passage 14 that bypasses the heater core 11, and is provided so as to be rotatable within a predetermined range around a rotary shaft 12A. When the cool air bypass door 12 opens the cool air passage 14, part of the air cooled by the refrigerant evaporator 10 can flow by bypassing the heater core 11 without being heated by the heater core 11. Therefore, by increasing the opening degree of the cool air bypass door 12, F
The outlet temperature of the ACE outlet 5 can be reduced. The cold air bypass door 12 can be manually opened and closed by an occupant. The warm air shut door 13
As shown in FIG. 1, it opens and closes a hot air passage 15 leading to the FACE outlet 5 downstream of the heater core 11, and is provided so as to be rotatable within a predetermined range around a rotation shaft 13A. The hot air shut door 13 is movably connected to the cool air bypass door 12 by a connection link 16.

The connecting link 16 has pins 16a, 1
6b, and one of the pins 16a is
And the other pin 16b is engaged with an arc-shaped link groove 17 provided in the hot air shut door 13. Below is the link 1
Function 6 will be described. a) When the cold air bypass door 12 operates in the opening direction (the direction of the arrow a in FIG. 1). When the other pin 16b contacts one end of the link groove 17 and presses the link groove 17, the warm air shut door 13 having the link groove 17 is pressed.
In the closing direction (the direction of the arrow d in FIG. 1).

B) When the cold air bypass door 12 operates in the closing direction (the direction of the arrow b in FIG. 1). The other pin 16b
Moves in the link groove 17 toward the other end, so that the other pin 16b and the link groove 17 can move relative to each other, and the hot-air shut door 13 moves within the movable range. At this time, the hot air shut door 13 is
5 can be opened in the direction of arrow c in FIG. 1 by receiving the wind pressure of the blowing air flowing toward the FACE outlet 5. However, if the FACE outlet 5 is closed by changing the outlet mode or the like while the cool air bypass door 12 is open, the cold air bypassing the heater core 11 tends to flow back through the hot air passage 15, so the hot air shut door 13, a reverse wind pressure is applied. Thus, the hot air shut door 13 receives the reverse wind pressure and closes the hot air passage 15 irrespective of the opening position of the cool air bypass door 12.

Next, the operation of this embodiment will be described.
When the FACE mode (the FACE door 9 opens the FACE outlet 5) is selected, the conditioned air whose temperature has been adjusted according to the set temperature is blown out from the FACE outlet 5 into the vehicle interior. At this time, if the temperature is set with the cool air bypass door 12 closed, the FACE blowing temperature can be changed according to the opening of the cool air bypass door 12. That is, when the cool air bypass door 12 is opened, part of the cool air cooled by the refrigerant evaporator 10 bypasses the heater core 11 and flows to the FACE outlet 5, and the opening degree of the hot air shut door 13 decreases, and the temperature decreases. Since the air volume is reduced, the FACE blowing temperature can be reduced accordingly. Further, when the cold air bypass door 12 is fully opened, the hot air shut door 13 is fully closed, so that the FACE blowing temperature is reduced to the maximum cooling temperature (MAXCOO).
L).

Thereafter, when the FACE door 9 closes the FACE outlet 5 by changing the outlet mode while the cool air bypass door 12 is open, the air upstream side pressure of the FACE door 9 increases, and the heater core 11 is closed. The bypassed cold air tries to flow back through the hot air passage 15. As a result, as shown in FIG. 2, a reverse wind pressure is applied to the warm air shut door 13, and the warm air shut door 13 closes the warm air passage 15 by receiving the reverse wind pressure. The hot air shut door 13 is connected to the cold air bypass door 12 by the function of the connecting link 16 described above.
Irrespective of the opening position of the hot air passage 1
5 can be closed.

(Effects of the present embodiment) In the air conditioning unit 2 of the present embodiment, when the hot air shut door 13 receives the reverse wind pressure, the cool air bypass door 1
The hot air passage 15 can be closed irrespective of the position of the second opening. Accordingly, it is possible to prevent the cool air that has bypassed the heater core 11 from flowing backward through the hot air passage 15 to another outlet, and to prevent the outlet temperature of the other outlet from changing. Further, since the hot air shut door 13 can be used as a backflow prevention door for cold air, it is not necessary to provide a dedicated backflow prevention door in addition to the cold air bypass door 12 and the hot air shut door 13 as in the related art. Accordingly, the number of components can be reduced to reduce costs, and the space for installing a dedicated backflow prevention door is not required, so that the air conditioning unit 2 can be downsized.

In the embodiment described above, the warm air shut door 13 is closed by the reverse wind pressure generated when the FACE door 9 closes the FACE outlet 5.
Even when the ACE door 9 opens the FACE outlet 5 (the outlet mode is not changed), the FACE outlet 5
Even when the movable grill provided in the above is closed, the backflow of the cool air can be prevented by closing the warm air shut door 13 as in the case of the above embodiment.

[Brief description of the drawings]

FIG. 1 is a unit sectional view showing a cold air bypass door and a hot air shut door.

FIG. 2 is a unit sectional view showing a hot air shut door when receiving a reverse wind pressure.

FIG. 3 is an overall view of an air conditioning unit.

FIG. 4 is a drawing of an air conditioning unit showing a state in which a backflow prevention door is open.

FIG. 5 is a drawing of an air conditioning unit showing a state in which a backflow prevention door is closed.

[Explanation of symbols]

 Reference Signs List 5 FACE outlet 10 Refrigerant evaporator 11 Heater core 12 Cold air bypass door 13 Hot air shut door 14 Cold air passage 15 Hot air passage 16 Connection link (connection means) 16b Other pin (pin) 17 Link groove

Claims (2)

[Claims] A face outlet for blowing air toward an upper body of an occupant; a refrigerant evaporator for cooling the blown air; a heater core for heating the air cooled by the refrigerant evaporator; A cold air passage that bypasses a heater core and communicates with the face air outlet; a hot air passage that communicates from the heater core to the face air outlet; a cold air bypass door that can open and close the cold air passage; and a hot air shut that can open and close the hot air passage. Door, the cold air bypass door and the hot air shut door are movably connected, and when the cold air bypass door is operated in the opening direction, the hot air shut door is operated in the closing direction, and the cold air bypass door is When operating in the closing direction, the pressure of the blast air flowing toward the face outlet through the warm air passage causes the warm air to flow. Connecting means that can be operated in the opening direction of the shut-off door, and allow the hot-air shut door to close when the hot-air shut door receives a reverse wind pressure, regardless of the opening position of the cold-air bypass door. A vehicle air conditioner comprising: 2. The connecting means is provided on a pin that moves following the movement of one of the cold air bypass door and the hot air shut door, and is provided on the other door, and is engaged with the pin. When the cold air bypass door is fully opened, the relative movement between the pin and the link groove becomes impossible, restricting the hot air shut door to the fully closed position, and the cold air bypass door is moved from the fully open position. 2. The vehicle air conditioner according to claim 1, wherein, when operated in the closing direction, the pin and the link groove can move relative to each other, and the hot-air shut door can move within the movable range.