JPH03118208A - Air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To prevent deterioration of feeling in air conditioning especially at the time of bi-level blow-put mode by providing a hot air passage leading the air passed through a heating means to a foot side blow-out port directly, and enabling a damper to open and close the blow-out port and the passage. CONSTITUTION:A heater unit case 52 internally having a hot water circuit 4 is provided at the downstream side of a duct 5 having a coolant vaporizer 31 on the way thereof. At this case 52 a suction port 53, central blow-out port 54, side blow-out port 55, window side blow out port 56 and foot side blow out port 57 are formed, and therein an air mix door 6 is provided at the upstream side of a heater core 41. A first damper 7 is arranged at the upstream side of the port 54 while a second damper 8 is arranged at the upstream side of the port 56, and also a third damper at the downstream side of the port 57. This third damper serves to opens the port and a hot air passage 59 in a half manner at the time of bi-level blow-out mode to largely open the port 57 at the time of foot side blow-out mode thereby to slightly open the passage.

Description

[Detailed description of the invention] [Industrial application field 1 The present invention relates to a vehicle air conditioner.

[Prior Art] Conventionally, for example, in an automobile air conditioner, in order to improve the defrosting ability, warm air is directed toward the side window glass even in the mode of blowing from the side outlet. There is a heater unit that blows out the air and keeps the side windows from fogging up. In order to further improve defroster performance in such a heater unit,
It is desirable that the temperature of the hot water blown out from the side outlet and the temperature of the hot water blown out from the foot outlet are approximately the same.

[Problems to be Solved by the Invention] However, in this case, as shown in the graph of FIG. Blowout temperature a
Temperature difference Δt between 1 and the outlet temperature b1 blown out from the foot outlet
becomes 10°C to 15°C.

For this reason, there is a problem in that the air conditioning feeling in the bilevel blowing mode deteriorates.

As a device for solving this problem, an air conditioner for automobiles (Japanese Utility Model Publication No. 1-11524) has been proposed.

This air conditioner controls the upper and lower temperatures in the vehicle interior by providing a hot air guide path with a switching door that communicates the downstream area of the heater core with the upstream area of the window outlet. However, this air conditioner requires a dedicated switching door in order to control the upper and lower temperatures in the vehicle interior, which has the problem of increasing the number of parts and increasing costs.

The present invention has a small number of parts, is low cost, increases the temperature difference between the first outlet and the second outlet in the bilevel outlet mode, and increases the temperature difference between the first outlet and the second outlet in the foot outlet mode. The purpose of the present invention is to provide an air conditioner for a vehicle that can reduce the temperature difference between the air conditioner and the outlet.

[Means for Solving the Problems] The vehicle air conditioner of the present invention includes a heating means for heating passing air, a suction port that houses the heating means and sucks cold air into the inside, and a foot blowing mode. When in bi-level blowout mode,
A first outlet that blows out airflow toward the window glass and the upper body of the vehicle occupant, and a second outlet that blows out airflow toward the feet of the vehicle occupant when in footwell blowout mode and bilevel blowout mode.
A casing having an air outlet, and a ventilation path that is disposed on a side of the heating means and that guides air that has passed through the heating means or air that has bypassed the heating means to the first air outlet and the second air outlet. and, disposed in the casing, the cold air sucked from the suction port passes through the heating means and heads toward the first and second blow-off ports, and the air bypasses the heating means and flows into the air. an air mix door that distributes air toward the first outlet and the second outlet, and the casing directs the air that has passed through the heating means to the first outlet in the foot outlet mode and the bi-level outlet mode. a hot air passage leading to the second air outlet, and a damper that opens and closes the second air outlet and the hot air passage; It is characterized by opening wider than when in blowout mode.

[Function] The air mix door allows the cold air sucked in from the suction port to pass through the heating means and head toward the first and second blow-off ports, and the air to bypass the heating means and flow to the first and second blow-off ports. The air is divided into the air heading towards the exit.

(When in bi-level blowout mode) The cold air that has passed through the heating means is heated and becomes high-temperature warm air. Since the hot air passage is opened more widely by the damper than in the footwell blowing mode, a large amount of this hot air flows into the hot air passage and is blown out from the second air outlet toward the feet of the vehicle occupant.

On the other hand, the cold air that has bypassed the heating means is guided to the first outlet and the second outlet. Therefore, most of the cold air is blown out from the first air outlet toward the window glass and the upper body of the vehicle occupant.

Therefore, in the bi-level blowout mode, the temperature difference between the blowout temperature from the first blowout port and the blowout temperature from the second blowout port becomes large.

(During the foot blow mode) The cold air that has passed through the heating means is heated and becomes hot air at a high temperature. Since the hot air passage is opened smaller by the damper than in the bilevel blowout mode, a large amount of this high temperature hot air flows into the ventilation passage. The high-temperature warm air that has flowed into the ventilation path is mixed with the cold air that has bypassed the heating means, and is guided to the first outlet and the second outlet. For this reason, high-temperature warm air
Air is blown from the first air outlet toward the window glass and the upper body of the vehicle occupant, and further from the second air outlet toward the feet of the vehicle occupant.

Therefore, in the foot-blowing mode, the temperature difference between the temperature of the air blown out from the first air outlet and the temperature of air blown out from the second air outlet becomes small.

In addition, as mentioned above, the damper has a function of controlling the opening and closing of the second outlet and a device 1m that controls the temperature of the air blown out from the first outlet and the second outlet, so compared to the conventional device. This reduces the number of parts.

[Effects of the Invention] Since the temperature difference between the temperature of the air blown out from the first air outlet and the air temperature blown out from the second air outlet in the bi-level air outlet mode can be increased, optimal air conditioning for cold head and cold feet can be achieved. It can be carried out. In addition, since the temperature difference between the temperature of the air blown out from the first air outlet and the air temperature blown out from the second air outlet in the foot air outlet mode can be reduced,
The ability to remove frost from side window glass can be improved.

Furthermore, the number of parts can be reduced compared to conventional devices, resulting in lower costs.

[Example] A vehicle air conditioner according to the present invention will be described based on an example shown in FIGS. 1 to 11.

1 to 9 show a first embodiment adopted in the present invention. FIG. 1 shows a ventilation duct for an automobile air conditioning system.

1 shows a heating and cooling system for an automobile that employs the air conditioner for a vehicle according to the present invention. This automotive air conditioning system 1 includes a blower 2, a refrigeration cycle 3, a hot water circuit 4, and a ventilation duct 5.

The blower 2 includes a fan 21 that generates an air flow toward the vehicle interior within the ventilation duct 5, and a motor 22 that rotationally drives the fan 21.

The refrigeration cycle 3 includes a refrigerant evaporator 31, a pressure reducing device (not shown), a receiver (not shown), and a refrigerant condenser (not shown).
, and a refrigerant pipe 32 connecting these. The refrigerant evaporator 31 cools the air passing through the ventilation duct 5 by exchanging heat with the refrigerant.

The hot water circuit 4 includes a heat exchanger (heater core) 41 as a heating means, an engine (not shown) mounted on an automobile, and a cooling water pipe 42 connecting these.

This heater core 41 is connected to a cooling water pipe 4 where the engine cooling water warmed in the engine cooling jacket is supplied to the cooling water pipe 4.
It is supplied through 2. The heater core 41 heats the passing air by exchanging heat with engine cooling water.

The ventilation duct 5 has a ventilation unit case 50, a cooler unit case 51, and a heater unit case 52 as a casing.

The blower unit case 50 houses the fan 21 of the blower 2. The cooler unit case 51 houses the refrigerant evaporator 31 of the refrigeration cycle 3.

The heater unit case 52 houses the heater core 41 of the hot water circuit 4. In addition, the heater unit case 52
A suction port 53, a central air outlet 54, a side air outlet 55 as a first air outlet, a window air outlet 5G, and a foot air outlet 57 as a second air outlet are formed in the.

The suction port 53 is disposed near the upstream side of the heater core 41 , sucks air (cold air) cooled by the refrigerant evaporator 31 into the heater unit case 52 , and sends the air to the heater core 41 . The central air outlet 54 is disposed above the heater unit case 52 and blows out air toward the upper body of the vehicle occupant. The side air outlet 55 is disposed above the heater unit case 52 and constantly blows out air toward the side window glass and the upper body of the vehicle occupant. The window outlet 56 is arranged above the heater unit case 52,
0 foot air outlet 5 that blows air toward the front window glass
7 is disposed above the heater unit case 52 and blows air toward the feet of the vehicle occupant.

Each of these air outlets 54, 56, and 51 is selectively opened and closed by an air outlet mode switching lever (not shown) provided at the front of the vehicle interior. The blowout mode switching lever switches between center blowout mode F, high Ly health (Bl-LEVEL) blowout mode, foot blowout mode, footwell/window blowout mode, and window blowout mode.

Furthermore, the heater unit case 52 has a ventilation passage 58 and a hot air ventilation FI@59.

The ventilation passage 58 is formed on both sides of the heater core 41 and the suction port 53 so as to surround the heater core 41 and the suction port 53. Further, the ventilation passage 58 guides the warm air heated by the heater core 41 to the central outlet 54, the window outlet 56, or the foot outlet 57. The hot air passing through the ventilation path 58 is mixed with the cold air that has bypassed the heater core 41 on the upstream side of the central outlet 54 . Furthermore, the ventilation passage 58 is connected to the heater core 41
A first ventilation path 61 is formed on one side of the suction port 53, and a second ventilation path 62 is formed on the other side of the heater core 41 and the suction port 53. The cross-sectional area ratio of the first ventilation passage 61 and the second ventilation passage 62 is
1:1 is desirable because the ratio may flow at a ratio of 1:62.

The hot air passage 59 is connected to the heater core 41 during the bilevel blowout mode, the footwell blowout mode, and the footwell/window blowout mode.
The heated air is guided directly to the foot outlet 51.

Further, an air mix door 6 according to the present invention is disposed upstream of the heater core 41 in the heater unit case 52. The air mix door 6 is set at a fully open position, a fully closed position, and any intermediate position between these positions. When the air mix door 6 is set to the fully open position,
All the cold air sucked from the suction port 53 is transferred to the heater core 41.
send to When the air mix door 6 is set to the fully closed position, all the cold air sucked in from the suction port 53 bypasses the heater core 41 and directs it directly to each of the air outlets 54 to 57.

When the air mix door 6 is set at the intermediate position, the air mix door 6 directs the cold air sucked in from the suction port 53 to the air headed for the heater core 41 and directly to each of the air outlets 54 to 5 by bypassing the heater core 41.
It is divided into air heading towards 7.

A first damper 7 is disposed upstream of the central outlet 54. This first damper 7 opens and closes the central air outlet 54 according to each air blowing mode.

That is, the first damper 7 fully opens the central air outlet 54 in the central air blowing mode. Further, the first damper 7 half-opens the central air outlet 54 during the bilevel air blowing mode. Furthermore, the first damper 7 fully closes the central air outlet 54 during the footwell mode, the footwell/window mode, or the window mode.

A second damper 8 is disposed upstream of the window outlet 56. This second damper 8 opens and closes the window air outlet 56 according to each air blowing mode.

In other words, the second damper 8 fully opens the window outlet 56 during the central blowout mode or the bilevel blowout mode. Also,
The second damper 8 opens the central air outlet 54 slightly during the foot air blowing mode. Furthermore, the second damper 8 half-opens the window outlet 56 during the footwell/window outlet mode. And the second damper 8
fully opens the window outlet 56 in the window outlet mode.

A third damper 9 as a damper according to the present invention is disposed upstream of the foot outlet 57. This third damper 9 opens and closes the foot air outlet 57 and the hot air passage 59 according to each air blowing mode.

That is, the third damper 9 fully closes the foot air outlet 57 during the central air blowing mode. Further, the third damper 9 half-opens the foot outlet 57 and the hot air passage 59 during the bilevel blow mode. Further, the third damper 9 largely opens the foot outlet 57 in the foot outlet mode or the foot/window outlet mode, and slightly opens the hot air passage 59; 57 is fully closed.

In addition, the opening degree θ of the hot air passage 59 in the bilevel blowing mode
is set to open more than the opening degree θ of the hot air passage 59 in the footwell blowing mode and the footwell/window blowing mode. 59 is opened by θ16°, and the hot air passage 59 is opened by θ=5° in the footwell blowing mode and the footwell/window blowing mode.

The operation of the automotive air conditioning system 1 of this embodiment will be explained based on FIGS. 1 to 9.

When the fan 21 rotates, an air flow toward the vehicle interior is generated within the ventilation duct 5. For this reason, the ventilation unit case 5
The air (air outside the vehicle or air inside the vehicle) that has flowed into the vehicle is cooled by the refrigerant evaporator 31 of the refrigeration cycle 3 and becomes cold air. This cold air is sucked into the heater unit case 52 from the suction port 53.

The cold air sucked in from the suction port 53 is passed through the air mix door 6
Depending on the setting position, the air is divided into air passing through the heater core 41 and air directly heading to each of the air outlets 54 to 57.

(In center blowout mode) When the center blowout mode is selected by the blowout mode switching lever, the first to third dampers 7 to 9 are set to the positions shown in FIG. 2. That is, the first damper 7 fully opens the central air outlet 54. Further, the second damper 8 fully opens the window outlet 56. Further, the third damper 9 completely closes the foot air outlet 57.

Therefore, the heater core 41 is sucked in from the suction port 53.
The high-temperature warm air heated by the first ventilation passage 61 and the second
The air flows into the ventilation passages 62, respectively. The high-temperature warm air that has flowed into the first ventilation passage 61 and the second ventilation passage 62 is mixed with low-temperature cold air distributed by the air mix door 6 on the upstream side of the central air outlet 54 and the side air outlet 56. Ru. The cool air that has been mixed and has an appropriate temperature is blown out from the center outlet 54 and the side outlet 55 toward the upper body of the vehicle occupant.

(At the time of bilevel mode) When the bilevel blowout mode is selected by the blowout mode switching lever, the first to third dampers 7 to 9 are set to the positions shown in FIG. 3. That is, the first damper 7 is
The central air outlet 54 is half-opened.

Further, the second damper 8 makes the window air outlet 56 all 1].

Furthermore, the third damper 9 slightly opens the foot outlet 51,
For example, the third damper 9 opens the hot air passage 59 by θ=16 degrees.

Therefore, the heater core 41 is sucked in from the suction port 53.
A large amount of the heated hot air flows into the hot air passage 59, and only a small amount flows into the first ventilation passage 61 of the ventilation passage 58.

On the other hand, the low-temperature cold air distributed by the air mix door 6 is mixed with a small amount of high-temperature warm air that has flowed into the first ventilation path 61 of the ventilation path 58, and becomes slightly high-temperature cold air. This slightly high-temperature cold air passes through the first ventilation path 61 of the ventilation path 58 to the central air outlet 54, the side air outlet 55, and the foot air outlet 57.
guided by. Therefore, the slightly high temperature cold air is blown out from the center outlet 54 and the side outlet 55 toward the side window glass and the upper body of the vehicle occupant. Further, a large amount of high-temperature hot air that has flowed into the hot-air passage 59 is mixed with a small amount of slightly high-temperature cold air that has flowed into the second ventilation passage 62 of the ventilation passage 58 to become slightly high-temperature warm air. This slightly high-temperature warm air is blown out from the footwell outlet 57 toward the feet of the vehicle occupant.

That is, as shown in the graph of FIG. 7, the air outlet temperature A1 of the central air outlet 54 and the side air outlet 55 in the bilevel air outlet mode (the opening degree θ of the hot air passage 59 is 16°, shown by the broken line) and the foot Temperature difference Δ from the outlet temperature B1 of the outlet 57
T1 becomes large (for example, 30° C. to 40° C.), so the difference in temperature between the upper and lower sides of the vehicle interior becomes larger, and optimal air conditioning for cold head and warm feet can be performed.

(During the footwell mode or the footwell/window blowout mode) When the footwell blowout mode or the footwell/window blowout mode is selected by the blowout mode switching lever, the first to third dampers 7 to 9 are set to the position shown in FIG. It is set at the position shown in FIG. That is, the first damper 7 completely closes the central air outlet 54. Further, the second damper 8 opens the window outlet 56 slightly or half-opens it. Furthermore, the third damper 9 opens the foot outlet 57 to a larger extent, and opens the hot air passage 59 to a smaller extent than in the bilevel blowing mode. For example, the third damper 9 opens the hot air passage 59 by θ-5°.

Therefore, a large amount of high-temperature hot air heated by the heater core 41 flows into the first ventilation path 61 of the ventilation path 58, and only a small amount flows into the hot air path 59.

Therefore, a large amount of high-temperature warm air that flows into the first ventilation path 61 of the ventilation path 58 bypasses the heater core 41 and mixes with the cold air that flows toward the side air outlet 55, the window air outlet 56, and the foot air outlet 57. or high-temperature warm air. This slightly high-temperature warm air passes through the first ventilation passage 61 of the ventilation passage 58 and is guided to the side outlet 55 and the window outlet 56, and then flows through the ventilation passage 58.
The air flows into the second ventilation passage 62 . The slightly high-temperature warm air that has flowed into the second ventilation passage 62 is mixed with a small amount of high-temperature warm air that has flowed into the hot-air passage 59 to become high-temperature warm air. This high-temperature warm air is blown out from the footwell outlet 57 toward the feet of the vehicle occupant.

On the other hand, the slightly high temperature warm air guided to the side air outlet 55 and the window air outlet 56 is
It is blown out towards the front window glass, side window glass, and the upper bodies of vehicle occupants.

That is, as shown in the graph of FIG. 8, in the foot-blowing mode (opening degree θ-5° of the hot air passage 59, shown by the solid line), the air blowing out from the window air outlet 56 and the side air outlet 55 The temperature difference ΔT2 between the temperature A2 and the hot water temperature B2 blown out from the foot outlet 57 becomes smaller (for example, 10° C.
15°C), therefore, the defroster performance of the front window glass and side window glass is dramatically improved.

FIG. 9 is a graph showing changes in the blowout temperature when the opening degree of the hot air passage 59 is changed in the footwell blowout mode. As can be seen from this graph, the opening degrees of the five hot air passages in the foot-blowing mode are compared to the opening degrees (
The opening is smaller than the opening in bi-level blowout mode (θ=4°,
It can be said that the temperature difference will be smaller if the temperature difference is as shown by the solid line. Note that A is the temperature of the air blown out from the side air outlet 55, and B
indicates the temperature of the air blown out from the foot air outlet 57.

(During window blowout mode) When the window blowout mode is selected by the blowout mode switching lever, the first to third dampers 1 to 9 are set to the positions shown in FIG. 6. That is, the first damper 7 completely closes the central air outlet 54. Further, the second damper 8 is connected to the window air outlet 5.
Fully open 6. Furthermore, the third damper 9
7 fully closed.

Therefore, the high temperature hot air heated by the heater core 41 passes through the first ventilation passage 61 and the second ventilation passage 62 of the ventilation passage 58 and is mixed with low temperature cold air on the upstream side of the side outlet 55. The warm air that has been mixed and has an appropriate temperature is blown out from the side blow-off ports 55 and the window blow-off ports 56 toward the front window glass and the side window glass.

As mentioned above, the third damper 9 of this embodiment has the function of controlling the opening degree of the foot outlet 57 and the function of controlling the opening degree of the foot outlet 57 and the function of controlling the opening degree of the foot outlet 57 and the function of controlling the opening degree of the foot outlet 57 and the function of controlling the opening degree of the foot outlet 57 and the function of controlling the opening degree of the foot outlet 57 and the function of controlling the opening degree of the foot outlet 57 and the function of controlling the opening degree of the foot outlet 57 and controlling the air outlet from the central outlet 54, the side outlet 55, the window outlet 56, and the foot outlet 57. It has a function to control the blowing temperature. This eliminates the need for a dedicated switching door, reducing the number of parts compared to conventional equipment that has a hot air duct with a switching door that communicates the downstream area of the heater core with the upstream area of the window outlet. be able to. Further, since a dedicated switching door drive mechanism is not required, the structure is simplified, resulting in an extremely low-cost automotive air conditioning system 1.

FIG. 10 shows a second embodiment adopted in the vehicle air conditioner of the present invention.

(The same functional objects as in the first embodiment are given the same numbers.) In this embodiment, the foot outlet 51 is formed below the first ventilation passage 61 of the ventilation passage 58. Even in this case, since the third damper 91 can open and close the foot outlet 51 and the hot air passage 59, the same effects as in the first embodiment can be obtained.

FIG. 11 shows a third embodiment adopted in the vehicle air conditioner of the present invention.

(The same functions as those in the first embodiment are given the same numbers.) In this embodiment, the third damper 92 is a butterfly damper. Even in this case, since the third damper 92 can open and close the foot outlet 57 and the hot air passage 59, the same effects as in the first embodiment can be obtained.

<Modifications> In this embodiment, the heater core of the hot water circuit is used as the heating means, but an electric heater or a fuel-burning stove may be used as the heating means.

The first damper or the second damper may be used to open and close the first ventilation passage or the second ventilation passage.

In this embodiment, a heater unit in which the side outlet is always open is used, and the heater unit can also be used in which the side outlet is opened and closed by the first damper.

In this embodiment, a side outlet is used as the first outlet, but a central outlet or a window outlet may be used as the first outlet. In this case, the first damper and the second damper are No longer needed.

In this embodiment, the present invention was used in a heating and cooling system for a vehicle, but the present invention may also be used in a heating system for a vehicle that does not have a refrigeration cycle.

[Brief explanation of drawings]

1 to 9 show a first embodiment adopted in the present invention, FIG. 1 is a schematic diagram showing an air conditioning system for an automobile, and FIG.
The figure is a schematic diagram showing the set positions of each damper in the central blowout mode of the heater unit, Figure 3 is a schematic diagram showing the set positions of each damper in the bilevel blowout mode of the heater unit, and Figure 4 is a schematic diagram showing the set positions of each damper in the heater unit's base blowout mode. Figure 5 is a schematic diagram showing the setting positions of each damper in the heater unit's foot/window mode, Figure 6 is the setting of each damper in the heater unit's window mode. It is a schematic diagram showing a position. Figure 7 is a graph showing the relationship between the opening degree of the air mix door and the temperature of the air from each outlet in the bi-level outlet mode, and Figure 8 is the graph showing the relationship between the opening degree of the air mix door and the outlet temperature in the foot outlet mode. It is a graph which shows the relationship with the blowing temperature from. FIG. 9 is a graph showing the change in the blowout temperature when the opening degree of the hot air passage in the footwell blowout mode is changed. FIG. 10 shows the second embodiment adopted in the present invention.
FIG. 0 is a schematic diagram showing the setting positions of each damper in the bilevel blowing mode of the heater unit. FIG. 11 shows the third embodiment adopted in the present invention.
FIG. 1 is a schematic diagram showing the set positions of each damper in the bilevel blowing mode of the heater unit. In the diagram

Claims (1)

[Claims] 1) A heating means for heating passing air, an inlet that houses the heating means and sucks cold air into the interior, and a heating means for heating the passing air, an inlet for sucking cold air into the interior, and a heating means for heating the air passing through the air. The first part blows out airflow towards the upper body of the person.
an air outlet, a second air outlet that blows out air toward the feet of the vehicle occupant during the footwell blowout mode and the bilevel blowout mode, and a second blowout outlet that is disposed on the side of the heating means and that blows air that has passed through the heating means. or a casing having a ventilation passage that guides air that has bypassed the heating means to the first blowout port and the second blowout port; an air mix door that distributes air passing through the means toward the first outlet and the second outlet, and air bypassing the heating means and heading toward the first outlet and the second outlet; The casing includes a hot air passage that directly guides the air that has passed through the heating means to the second air outlet during the foot blowing mode and the bilevel blowing mode, and opening and closing of the second blowing outlet and the hot air passage. An air conditioner for a vehicle, further comprising a damper that opens and closes the hot air passage in the bilevel blowing mode, the damper opening the hot air passageway in the bilevel blowing mode to a larger extent than in the foot blowing mode.