JPH0813604B2 - Air conditioning system for vehicles - Google Patents

Description

TECHNICAL FIELD The present invention relates to a vehicle cooling and heating device.

[Prior Art] Japanese Unexamined Patent Publication No. 63-235116 discloses a heater unit in which a heater core whose supply and stop of supply of hot water are controlled by a water valve is provided downstream of an air mix damper. .

This heater unit has a suction port that sucks air inside,
It has an air outlet for blowing out an air flow toward the passenger compartment, and two warm air passages formed on both sides of the heater core.

Therefore, in this heater unit, the hot air heated by the heater core passes through the two hot air passages to sandwich the cold air, so that the hot air and the cold air are mixed well.

[Problems to be Solved by the Invention] However, in the above-mentioned heater unit, when the water valve is abolished, even if the upstream side of the heater core is blocked by the air mix damper during the maximum cooling operation, the two hot air passages are provided. Airflow is generated. For this reason, there is a possibility that part of the air sucked from the suction port may be heated by the heater core when passing through the warm air passage, so that there is a problem that the temperature of the cool air blown from the blowout port rises.

It is an object of the present invention to provide a vehicle cooling and heating device that can suppress the temperature rise of the air blown from the air outlet during the cooling operation even if the water valve is eliminated.

[Means for Solving the Problems] A vehicle air conditioner of the present invention includes a heating unit that heats passing air, a casing that houses the heating unit therein, and a suction port that sucks air into the casing. An air outlet that blows out an air flow from the inside of the casing toward the passenger compartment, and a temperature that is formed on both sides of the heating means inside the casing, is sucked from the suction opening, and passes through the heating means to heat the air. Two warm air passages for guiding the air to both sides of the heating means to the air outlet, and are arranged in the casing, and the upstream side of the heating means is closed during the cooling operation and sucked from the suction port. Closing means that diverts cool air from the two hot air passages toward the air outlet, and rotatably supported in the casing to cover the air outlet and the two hot air passages. The one-sided hot air passage is selectively opened and closed, and the air outlet is fully opened during the cooling operation, and one plate-shaped damper is provided to fully close the one-side hot air passage. .

[Operation] When the cooling operation is performed, the closing unit closes the upstream side of the heating unit and causes all the cool air sucked from the suction port to bypass the heating unit and be directed to the air outlet. At this time, the air outlet is fully opened by one plate-shaped damper and one of the two hot air passages is fully closed. When the one side warm air passage is fully closed, no air flow is generated in the one side warm air passage, so that the cool air sucked from the suction port does not flow into the one side warm air passage. Furthermore, since no air flow is generated in the hot air passage on the other side of the two hot air passages that are not closed by the plate-shaped damper, the cold air sucked from the suction port does not flow into the hot air passage on the other side.

Therefore, the cold air sucked into the casing through the suction port is blown out toward the vehicle interior from the air outlet without being heated by the heating means.

[Effects of the Invention] During the cooling operation, the cold air sucked into the casing through the suction port is not heated by the heating means and is blown toward the vehicle interior from the air outlet to blow out air from the air outlet. Since it is possible to suppress the temperature rise of
It is possible to prevent the cooling feeling from being deteriorated. Further, since the one side hot air passage can be opened and closed by one plate-shaped damper that opens and closes the air outlet, the structure is simplified.

[Embodiment] A vehicle air conditioner of the present invention will be described based on an embodiment shown in the drawings.

1 to 6 show a first embodiment adopted in the present invention. FIG. 1 shows a ventilation duct of a vehicle air conditioner.

Reference numeral 1 denotes an automobile air conditioner / heater adopting the vehicle air conditioner / heater of the present invention. This vehicle air conditioner 1 has a blower 2, a refrigeration cycle 3, a hot water circuit 4, and a ventilation duct 5.

The blower 2 has a fan 21 that generates an air flow toward the passenger compartment in the ventilation duct 5, and a motor 22 that rotationally drives the fan 21.

The refrigeration cycle 3 has a refrigerant evaporator 31, a decompression device (not shown), a receiver (not shown), a refrigerant condenser (not shown), and a refrigerant pipe 32 connecting these. The refrigerant evaporator 31 exchanges heat between the air passing through the ventilation duct 5 and the refrigerant, and cools the air into cold air.

The hot water circuit 4 has a heat exchanger (hereinafter referred to as a heater core) 41 as a heating means according to the present invention, an engine (not shown) mounted on an automobile, and a cooling water pipe 42 connecting these.

The heater core 41 is supplied with engine cooling water warmed in a cooling water jacket of the engine through a cooling water pipe 42. The heater core 41 heats the air by exchanging heat between the passing air and the engine cooling water. Further, since the water valve is abolished in the hot water circuit 4, the engine cooling water is constantly supplied to the heater core 41 during the operation of the engine.

The ventilation duct 5 sends air toward the passenger compartment. The ventilation duct 5 has a blower unit case 50, a cooler unit case 51, and a heater unit case 52 as a casing according to the present invention.

The blower unit case 50 accommodates the fan 21 of the blower 2 and sucks the air outside the vehicle compartment or the air inside the vehicle compartment by the suction force of the fan 21. Cooler unit case 51
Accommodates the refrigerant evaporator 31 of the refrigeration cycle 3.

The heater unit case 52 is the heater core of the hot water circuit 4.
Holds 41. Further, in the heater unit case 52, the suction port 53, the upper body air outlet 54 as the air outlet according to the present invention, the window air outlet 55, the foot air outlet 56, and the warm air passage 57.
Are formed.

The suction port 53 is arranged near the upstream side of the heater core 41,
The air (cool air) cooled by the refrigerant evaporator 31 is sucked into the heater unit case 52, and the air is cooled by the heater core 41.
Send to The upper body outlet 54 is located above the heater unit case 52 in the figure, and moreover, the heater core 41 is centered around the suction port 53.
Is formed on the side opposite to the arrangement position of the vehicle, and blows an air flow toward the upper body of the vehicle occupant. The window outlet 55 is formed above the heater unit case 52 in the figure, and blows an air flow toward the front window glass. The foot outlet 56 is formed below the heater unit case 52 in the drawing, and blows an air flow toward the feet of the vehicle occupant.

Each of these outlets 54 to 56 is selectively opened and closed by an outlet mode switching lever (not shown) arranged on the front surface of the vehicle interior. The blowing mode switching lever switches the upper body blowing mode, the bi-level (BI-LEVEL) blowing mode, the foot blowing mode, the foot / window blowing mode, and the window blowing mode.

The warm air passages 57 are 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. In addition, the warm air passage 57 applies the warm air heated by the heater core 41 to the upper body outlet 54, the window outlet 55, or the foot outlet 56.
Lead to. The warm air passing through the warm air passage 57 is discharged from the upper body outlet 54.
Alternatively, it is mixed with the cool air that bypasses the heater core 41 on the upstream side of the window outlet 55.

The warm air passage 57 is formed on one side of the heater core 41 and the suction port 53 on one side, and on the other side of the heater core 41 and the suction port 53 on the other side. It has a wind passage 59. One side hot air passage 58
The hot air heated by the heater core 41
Upper body outlet 54 and window outlet through one side
Lead to 55. The other side hot air passage 59 guides the warm air heated by the heater core 41 to the upper body outlet 54, the window outlet 55, and the foot outlet 56 through the side of the heater core 41 on the other side.

The cross-sectional area ratio between the one-side warm air passage 58 and the other-side warm air passage 59 is preferably 1: 1 because air may flow through both the warm air passages 58 and 59.

In addition, the heater unit case 52 has an air mix door 6 as a closing means according to the present invention.

The air mix door 6 is a plate-like damper disposed downstream of the suction port 53 in the heater unit case 52 and upstream of the heater core 41. The air mix door 6 is in an open position (maximum heating operation) where all the cold air sucked through the suction port 53 passes through the heater core 41, and a closed position (maximum where the entire cool air is diverted from the heater core 41 by closing the upstream side of the heater core 41). (Cooling operation) or any intermediate position between them.

When the air mix door 6 is set to the intermediate position, the air passes through the heater core 41 and goes to the air outlets 54 to 56 and the air that bypasses the heater core 41 and goes directly to the air outlets 54 to 56. Cold wind is distributed. The cold air that bypasses the heater core 41 and heads directly to each of the air outlets 54 to 56 is heated by the heater core 41 on the upstream side of the upper body air outlet 54 or the window air outlet 55, and the one side hot air passage 58 or the other side. The hot air that has passed through the hot air passage 59 is mixed.

Further, on the upstream side of the upper body outlet 54 in the warm air passage 57, a first damper 7 as one plate-shaped damper (opening / closing means) according to the present invention is arranged. This first damper 7
Has an opening / closing function of the upper body outlet 54 and an opening / closing function of the warm air passage 58 on one side of the warm air passage 57.

That is, the first damper 7 is
The upper body air outlet 54 is opened most and the one side warm air passage 58 is closed. Further, the first damper 7 half-opens the upper body air outlet 54 and half-opens the one-side warm air passage 58 in the bi-level blowing mode. Further, the first damper 7 has an upper body outlet in the foot blowing mode, the foot / window blowing mode, and the window blowing mode.
54 is closed and one side warm air passage 58 is opened most.

The second damper 8 is disposed on the upstream side of the window outlet 55 in the ventilation passage 57. The second damper 8 has a window outlet 55.
Is a plate-shaped damper having an opening and closing function of the hot air passage 57 and an opening and closing function of the hot air passage 59 on the other side of the hot air passage 57.

That is, the second damper 8 closes the window outlet 55 and opens the other side warm air passage 59 most in the upper body blowing mode or the bilevel blowing mode. Further, in the foot blowing mode, the window outlet 55 is slightly opened and the other side warm air passage 59 is slightly opened. Further, the second damper 8 has the window outlet 55 in the window outlet mode.
Is most opened, and the warm air passage 59 on the other side is closed. And the second
In the foot / window blowing mode, the damper 8 half-opens the window outlet 55 and half-opens the other side warm air passage 59.

A third damper 9 is arranged on the upstream side of the foot outlet 56 in the warm air passage 57. The third damper 9 is a plate-shaped damper having an opening / closing function of the foot outlet 56.

That is, the third damper 9 is
Close the foot outlet 56. Further, the third damper 9 opens the foot outlet 56 halfway in the bi-level blowing mode. Further, the third damper 9 greatly opens the foot outlet 56 in the foot outlet mode or the foot / window outlet mode. Then, the third damper 9 opens or closes the foot outlet 56 most in the window blowing mode.

The operation of the vehicle air conditioner 1 according to this embodiment will be described with reference to FIGS. 1 to 6.

When the fan 21 rotates, an airflow toward the passenger compartment is generated in the ventilation duct 5. Therefore, the blower unit case 50
The air that has flowed into the vehicle (air outside the vehicle or air inside the vehicle)
It is cooled by the refrigerant evaporator 31 of the refrigeration cycle 3 to become cold air. This cold air is drawn into the heater unit case 52 through the suction port 53.
Sucked from. The cool air sucked from the suction port 53 is distributed to the air passing through the heater core 41 and the air flowing directly to the outlets 54 to 56 according to the set position of the air mix door 6.

I. Upper body blowing mode When the upper body blowing mode is selected by the blowing mode switching lever, the first to third dampers 7 to 9 are set to the positions shown in FIG. That is, the first damper 7 is set at a position where the upper body outlet 54 is most opened. For this reason,
The one side warm air passage 58 is closed. Also, the second damper 8
Is set to a position where the window outlet 55 is closed. For this reason,
The warm air passage 59 on the other side is most opened. Further, the third damper 9 is set at a position where the foot outlet 56 is closed.

Therefore, the hot air sucked from the suction port 53 and heated by the heater core 41 is heated by the first damper 7 in the one-side hot air passage.
The inflow to 58 is blocked, and the air flows into the warm air passage 59 on the other side. Then, the warm air that has flowed into the other-side warm air passage 59 passes through the suction port 53 and the other side of the heater core 41 toward the upper body outlet 54. The warm air reaching the upstream side of the upper body outlet 54 is mixed with the cool air distributed by the air mix door 6. The cold air that was mixed and reached an appropriate temperature,
It is blown out from the upper body outlet 54 toward the upper body of the vehicle occupant.

(During Maximum Cooling Operation) In the upper body blowing mode, as shown in FIG. 1, when the vehicle cooling / heating apparatus 1 is subjected to maximum cooling operation, the air mix door 6 is set to the closed position, so that the heater core
The upstream side of 41 is blocked, and the all-cooled air sucked from the suction port 53 directly goes to the blow-out ports 54 to 56.

At this time, the one side warm air passage 58 is closed by the first damper 7. When the one side warm air passage 58 is closed, the cold air sucked from the suction port 53 does not flow into the other side warm air passage 59 which is not closed yet. Therefore, the hot air passage 57
There is no air flow circulating inside. Therefore, the suction port
Since the cold air sucked from 53 is not heated by the heater core 41, the temperature of the cold air blown out from the upper body outlet 54 also rises in the hot water circuit 4 without a water valve (for example,
Almost no increase in temperature below 0.5 ° C). Therefore, it is possible to prevent the cooling feeling from being deteriorated due to the temperature rise of the cool air during the maximum cooling operation.

II. In bi-level mode When the bi-level blowing mode is selected by the blowing mode switching lever, the first to third dampers 7 to 9 are set to the third
It is set to the position shown in the figure. That is, the first damper 7
Is set to a position where the upper body outlet 54 is half opened. Therefore, the one-side warm air passage 58 is also slightly opened. Further, the second damper 8 is set at a position where the window outlet 55 is closed. Therefore, the other side hot air passage 59 is opened most. Furthermore, the third
The damper 9 is set at a position where the foot outlet 56 is half opened.

Therefore, a part of the warm air sucked through the suction port 53 and heated by the heater core 41 flows into the one-side warm air passage 58. Part of the warm air that has flowed into the warm air passage 58 on one side is the suction port.
53 and one side of the heater core 41 toward the upper body outlet 54. The warm air reaching the upstream side of the upper body outlet 54 is mixed with the cool air distributed by the air mix door 6. Part of the air, which has been mixed and has reached an appropriate temperature, is blown out from the upper body air outlet 54 toward the upper body of the vehicle occupant.

In addition, the air in the other part that was mixed and reached an appropriate temperature,
It flows into the warm air passage 59 on the other side. The other part of the air that has flowed into the other-side hot air passage 59 passes through the suction port 53 and the other side of the heater core 41 toward the foot outlet 56. Foot outlet 56
The other part of the air that has reached the upstream side of is heated by the heater core 41 and is mixed with the warm air flowing directly to the foot outlet 56. The warm air that has been mixed to have an appropriate temperature is blown from the foot outlet 56 toward the feet of the vehicle occupant.

III. In foot blowing mode or in foot / window blowing mode When the foot blowing mode or the foot / window blowing mode is selected by the blowing mode switching lever, the first to
The third dampers 7 to 9 are set at the positions shown in FIG. 4 or FIG. That is, the first damper 7 includes the upper body outlet 54.
Is set to the closed position. Therefore, the warm air passage on one side
58 is opened. Further, the second damper 8 is set to a position where the window outlet 55 is slightly opened or a position where it is half opened. Therefore, the other side warm air passage 59 is opened. Further, the third damper 9 is set to a position where the foot outlet 56 is wide open.

Therefore, a part of the warm air heated by the heater core 41 flows into the one-side warm air passage 58. A part of the warm air that has flowed into the one-side warm air passage 58 goes toward the window outlet 55 through the side of the suction port 53 and one side of the heater core 41. Window outlet 55
The warm air reaching the upstream side of is mixed with the cool air distributed by the air mix door 6. Part of the air that has been mixed and has reached an appropriate temperature is blown out from the window outlet 55 toward the front window glass, and removes the fogging of the front window glass.

In addition, the cold air of the other part that was mixed and reached an appropriate temperature,
It flows into the warm air passage 59 on the other side. The other part of the warm air that has flowed into the other side warm air passage 59 passes through the suction port 53 and the other side of the heater core 41 toward the foot outlet 56. Foot outlet 56
The other part of the air that has reached the upstream side of is heated by the heater core 41 and is mixed with the warm air flowing directly to the foot outlet 56. The warm air that has been mixed to have an appropriate temperature is blown from the foot outlet 56 toward the feet of the vehicle occupant.

IV. In window blowing mode When the window blowing mode is selected by the blowing mode switching lever, the first to third dampers 7 to 9 are set to the positions shown in FIG. That is, the first damper 7 is set at a position where the upper body outlet 54 is closed. Therefore, the one-side hot air passage 58 is opened. Further, the second damper 8 is set at a position where the window outlet 55 is most opened. Therefore, the other side warm air passage 59 is opened. Further, the third damper 9 opens the foot outlet 56 most.

Therefore, the warm air heated by the heater core 41 is
It is blocked by the damper 9 and does not flow into the other side warm air passage 59, but flows into the one side warm air passage 58. A part of the warm air that has flowed into the one-side warm air passage 58 goes toward the window outlet 55 through the side of the suction port 53 and one side of the heater core 41. The warm air reaching the upstream side of the window outlet 55 is mixed with the cool air distributed by the air mix door 6. The warm air that has been mixed to have an appropriate temperature is blown out from the window outlet 55 toward the front window glass, and removes fogging on the front window glass.

When the hot air flows from both the one-side hot air passage 58 and the other-side hot air passage 59, the hot air flows together at the upstream side of the window outlet 55 to cause turbulence in the flow. Therefore, the air volume decreases in the warm air passage 57. Therefore, in the present embodiment, the second damper 8
By closing the other side warm air passage 59, the reduction of the air volume in the warm air passage 57 is suppressed.

In addition, since the first to third dampers 7 to 9 of this embodiment can be arranged in the warm air passage 57 as described above, the conventional device (special feature) in which the warm air passage and the damper are separately provided. Kaisho 63-23
The size of the heater unit case 52 is much more compact than that of Japanese Patent No. 5116).

7 and 8 show a second embodiment adopted in the present invention. FIG. 7 shows the setting position of each damper in the upper body blowing mode inside the heater unit casing, and FIG. 8 shows the setting position of each damper in the window blowing mode inside the heater unit casing.

(Functions having the same functions as in the first embodiment are given the same numbers) In this embodiment, not only the foot outlet 56 is opened and closed in the third damper 90, but also the one side hot air passage 58 of the warm air passage 57 is opened and closed. It was done like this.

When using the third damper 90 as in this embodiment,
It is also possible to use the first damper 7 that does not open and close the one-side warm air passage 58.

(Modification) In this embodiment, the heater core of the hot water circuit is used as the heating means, but an electric heater or a stove that burns with fuel may be used as the heating means.

In the present embodiment, the air mix door is used as the closing means, but an opening / closing type covering member such as a shutter or a cover, or a bypass passage with a damper for bypassing cold air from the heating means may be used as the closing means.

In this embodiment, the upper body outlet is used as the outlet, but any outlet may be used as long as it blows out the airflow toward the vehicle interior. For example, it may be a window outlet or a foot outlet, or a plurality of outlets may be combined.

[Brief description of drawings]

1 to 6 show a first embodiment adopted in the present invention. FIG. 1 is a schematic diagram showing an air conditioning system for automobiles,
FIG. 4 is a schematic diagram showing the setting positions of the dampers in the upper body blowing mode in the heater unit casing, FIG. 3 is a schematic diagram showing the setting positions of the dampers in the bilevel blowing mode in the heater unit casing, and FIG. 4 is a heater. FIG. 5 is a schematic diagram showing the setting positions of the dampers in the foot blowing mode in the unit casing, FIG. 5 is a schematic diagram showing the setting positions of the dampers in the foot / window blowing mode in the heater unit casing, and FIG. 6 is a heater unit casing. It is a schematic diagram showing a setting position of each damper in a window blowing mode inside. 7 and 8 show a second embodiment adopted in the present invention. FIG. 7 is a schematic view showing the setting positions of the dampers in the upper body blowing mode in the heater unit casing, and FIG. 8 is a schematic view showing the setting positions of the dampers in the window blowing mode in the heater unit casing. In the figure, 1 ... Automotive air conditioner, 6 ... Air mix door (closing means), 7 ... First damper (opening / closing means), 41 ...
Heater core (heating means), 52 ... Heater unit case (casing), 53 ... Suction opening, 54 ... Upper body air outlet (air outlet), 57 ... Warm air passage, 58 ... One side warm air passage,
59 ...... other side hot air passage

Claims (1)

[Claims] 1. (a) heating means for heating passing air; (b) a casing that houses the heating means therein; (c) a suction port for sucking air into the casing; (d) the above. An outlet for blowing out an air flow from the inside of the casing toward the passenger compartment, and (e) is formed on both sides of the heating means in the casing, is sucked from the inlet and is heated by passing through the heating means. Two hot air passages that guide the hot air to the air outlet through both sides of the heating means, and (f) are arranged in the casing and close the upstream side of the heating means during the cooling operation to suck the suction air. Closing means for diverting the cool air sucked from the mouth from the two hot air passages and directing it toward the air outlet; (g) rotatably supported in the casing,
One plate that selectively opens and closes the hot air passage on one side of the air outlet and the two hot air passages, fully opens the air outlet during cooling operation, and completely closes the hot air passage on the one side. Air-conditioning system for vehicles equipped with a flat damper.