JPH0753486B2 - Air conditioner for vehicle - Google Patents

Description

TECHNICAL FIELD The present invention relates to a vehicle air conditioner.

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

[Problems to be Solved by the Invention] However, in this case, as shown in the graph of FIG. 7, even in the bi-level blowout mode in which a temperature difference between the upper and lower sides of the passenger compartment is required, the side outlets Blowing temperature a1
And the temperature difference Δt between the outlet temperature b1 blown out from the foot outlet is 10
℃ ~ 15 ℃. Therefore, there is a problem that the air conditioning feeling in the bi-level blowout mode deteriorates.

As a device for solving this problem, an air conditioner for automobiles (Japanese Utility Model Publication No. 1-115424) has been proposed. This air conditioner controls the vertical temperature in the vehicle compartment by providing a warm air guide passage with a switching door that connects the downstream region of the heater core and the upstream region of the window outlet. However,
This air conditioner has a problem in that the number of parts increases and the cost increases because a dedicated switching door is required to control the vertical temperature in the vehicle interior.

INDUSTRIAL APPLICABILITY The present invention has a small number of parts, is low in cost, and has a large temperature difference between the first outlet and the second outlet in the bi-level outlet mode, and the first outlet and the second outlet in the foot outlet mode. An object of the present invention is to provide a vehicle air conditioner that can reduce the temperature difference from the outlet.

[Means for Solving the Problem] The vehicle air conditioner of the present invention includes a heating means for heating passing air, a suction port for sucking cool air therein, and a foot blowing mode when the heating means is housed. In bi-level blowing mode,
A first outlet that blows out an airflow toward the window glass and the upper half of the vehicle occupant, and a second outlet that blows out an airflow toward the feet of the vehicle occupant during the foot blowing mode and the bilevel blowing mode
A casing having an air outlet and a ventilation passage that is disposed on the side of the heating means and that guides the air that has passed through the heating means or the air that bypasses the heating means to the first air outlet and the second air outlet. The cold air sucked from the suction port, which is disposed in the casing, bypasses the air flowing toward the first outlet and the second outlet through the heating means and the heating means, An air mix door that distributes air to the first air outlet and air to the second air outlet, and the casing directly conveys the air that has passed through the heating means in the foot blowing mode and the bi-level blowing mode. A hot air passage leading to two air outlets, and a damper for opening and closing the second air outlet and opening and closing the hot air passage, wherein the damper connects the warm air passage in the bilevel air outlet mode to the feet. Characterized in that the open larger than the output mode.

[Operation] The cold air sucked from the suction port bypasses the air that goes through the heating means toward the first outlet and the second outlet and the heating means by the air mix door to bypass the first outlet and the second outlet. It is distributed to the air going to the exit.

(In bi-level shaking mode) The cold air that has passed through the heating means is heated to become hot hot air. Since the warm air passage is opened by the damper to a larger extent than in the foot blowing mode, a large amount of this hot air flows into the warm air passage and is blown out from the second outlet toward the feet of the vehicle occupant.

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

Therefore, in the bilevel blowout mode, the temperature difference between the blowout temperature blown from the first blowout port and the blowout temperature blown from the second blowout port becomes large.

(In the foot blowing mode) The cold air that has passed through the heating unit is heated to become hot hot air. Since the hot air passage is opened by the damper so as to be smaller than that in the bilevel blowing mode, a large amount of this hot air flows into the ventilation passage. The high-temperature hot air that has flowed into this ventilation passage is mixed with the cold air that bypasses the heating means, and is introduced to the first outlet and the second outlet. Therefore, the hot hot air is blown from the first outlet toward the window glass and the upper half of the body of the vehicle occupant, and further from the second outlet toward the feet of the vehicle occupant.

Therefore, in the foot blow mode, the temperature difference between the blow temperature blown from the first blow outlet and the blow temperature blown from the second blow outlet becomes small.

Further, as described above, the damper has the function of controlling the opening and closing of the second outlet and the function of controlling the temperature of the air blown from the first outlet and the second outlet, so that the damper is compared with the conventional device. The number of parts is reduced.

[Advantages of the Invention] Since the temperature difference between the blowout temperature blown out from the first blowout port and the blowout temperature blown out from the second blowout port in the bilevel blowoff mode can be increased, optimum air conditioning for head cold foot heat can be achieved. It can be carried out. Further, since the temperature difference between the blowout temperature blown out from the first blowout port and the blowout temperature blown out from the second blowout port in the foot blowout mode can be reduced,
The ability to remove frost on the side window glass can be improved.
Further, the number of parts can be reduced as compared with the conventional device, resulting in low cost.

[Embodiment] A vehicle air conditioner of the present invention will be described based on an embodiment shown in Figs. 1 to 11.

1 to 9 show a first embodiment adopted in the present invention. FIG. 1 shows a ventilation duct of a vehicle air conditioner.

Reference numeral 1 denotes a vehicle air conditioner that uses the vehicle air conditioner 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 cools the air passing through the ventilation duct 5 by exchanging heat with the refrigerant.

The hot water circuit 4 has 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.

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 passing air by exchanging heat with the engine cooling water.

The ventilation duct 5 has a blower 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 is the heater core 41 of the hot water circuit 4.
Is stored. In addition, the heater unit case 52,
An inlet 53, a central outlet 54, a side outlet 55 as a first outlet, a window outlet 56, and a foot outlet 57 as a second outlet are formed.

The suction port 53 is arranged in the vicinity of the upstream side of the heater core 41, sucks the air (cool air) cooled by the refrigerant evaporator 31 into the heater unit case 52, and sends the air to the heater core 41. The central outlet 54 is disposed above the heater unit case 52 and blows out an air flow toward the upper body of the vehicle occupant. The side air outlet 55 is arranged above the heater unit case 52 and constantly blows out an air flow toward the side window glass and the upper half of the body of the vehicle occupant. The window outlet 56 is disposed above the heater unit case 52 and blows an air flow toward the front window glass. The foot outlet 57 is arranged below the heater unit case 52 and blows an air flow toward the feet of the vehicle occupant.

Each of these outlets 54, 56, 57 is selectively opened and closed by an outlet mode switching lever (not shown) arranged on the front surface of the vehicle compartment. The blowing mode switching lever switches the central blowing mode, the bi-level (BI-LEVEL) blowing mode, the foot blowing mode, the foot / window blowing mode, and the window blowing mode.

Further, the heater unit case 52 has an air passage 58 and a warm air passage 59.

The ventilation passages 58 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. Further, the ventilation passage 58 guides the warm air heated by the heater core 41 to the central air outlet 54, the window air outlet 56 or the foot air outlet 57. The warm air that passes through the air passage 58 is mixed with the cool air that bypasses the heater core 41 on the upstream side of the central outlet 54. further,
The air passage 58 includes a first air passage 61 formed on one side of the heater core 41 and the suction port 53 and a second air passage 62 formed on the other side of the heater core 41 and the suction port 53. Have. The cross-sectional area ratio between the first ventilation passage 61 and the second ventilation passage 62 is
1: 1 is desirable because it may flow through both ventilation channels 61, 62.

The hot air passage 59 guides the air heated by the heater core 41 directly to the foot outlet 57 in the bi-level air blowing mode, the foot air blowing mode, and the foot / window air blowing mode.

An air mix door 6 according to the present invention is arranged upstream of the heater core 41 in the heater unit case 52. The air mix door 6 is set to a fully open position, a fully closed position, and an intermediate position between them.
When the air mix door 6 is set to the fully open position, it sends all the cool air sucked from the suction port 53 to the heater core 41.
When the air mix door 6 is set to the fully closed position, all the cool air sucked from the suction port 53 bypasses the heater core 41 and is directly directed to each of the air outlets 54 to 57. When the air mix door 6 is set to the intermediate position, it distributes the cool air sucked from the suction port 53 to the air directed to the heater core 41 and the air bypassing the heater core 41 and directly directed to the air outlets 54 to 57.

The first damper 7 is arranged on the upstream side of the central outlet 54. The first damper 7 opens and closes the central outlet 54 according to each outlet mode.

That is, the first damper 7 fully opens the central outlet 54 in the central outlet mode. Further, the first damper 7 opens the central outlet 54 halfway in the bi-level outlet mode. Further, the first damper 7 fully closes the central outlet 54 in the foot blowing mode, the foot / window blowing mode, or the window blowing mode.

The second damper 8 is arranged on the upstream side of the window outlet 56. The second damper 8 opens and closes the window outlet 56 according to each blowout mode.

That is, the second damper 8 fully closes the window outlet 56 in the center blowout mode or the bilevel blowout mode. Further, the second damper 8 slightly opens the central outlet 54 in the foot blowing mode. Further, the second damper 8 half-opens the window outlet 56 in the foot / window blowing mode. Then, the second damper 8
In the window blowing mode, the window outlet 56 is fully opened.

A third damper 9 as a damper according to the present invention is arranged on the upstream side of the foot outlet 57. This third damper 9
Opens and closes the foot outlet 57 and the hot air passage 59 according to each of the blowing modes.

That is, the third damper 9 fully closes the foot outlet 57 in the center outlet mode. Further, the third damper 9 opens the foot outlet 57 and the warm air passage 59 halfway in the bi-level blowing mode. Further, the third damper 9 widens the foot outlet 57 and slightly opens the warm air passage 59 in the foot blowing mode or the foot / window blowing mode. Then, the third damper 9 fully closes the foot outlet 57 in the window blowing mode.

Note that the opening θ of the warm air passage 59 in the bilevel blowout mode
Is set to be larger than the opening θ of the warm air passage 59 in the foot blowing mode and the foot / window blowing mode. For example, when fully open is θ = 32 °, the warm air passage 59 is opened by θ = 16 ° in the bilevel blowing mode, and the warm air passage 59 is θ = 5 in the foot blowing mode and the foot / window blowing mode.
Open.

The operation of the vehicle air conditioner 1 according to this embodiment will be described with reference to FIGS. 1 to 9.

When the fan 21 rotates, an airflow toward the passenger compartment is generated in the ventilation duct 5. Therefore, the air (the air outside the vehicle compartment or the air inside the vehicle compartment) that has flowed into the blower unit case 50 is cooled by the refrigerant evaporator 31 of the refrigeration cycle 3 to become cold air.
This cold air is sucked into the heater unit case 52 through the suction port 53. 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 air outlets 54 to 57 according to the set position of the air mix door 6.

(In Central Blowout Mode) When the central 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. That is, the first damper 7 fully opens the central outlet 54. Further, the second damper 8 has a window outlet 56.
Fully close. Further, the third damper 9 fully closes the foot outlet 57.

Therefore, the high-temperature hot air sucked from the suction port 53 and heated by the heater core 41 is heated by the first ventilation passage 61 and the second ventilation passage.
Inflow to 62 respectively. First ventilation passage 61 and second ventilation passage
The hot hot air that has flowed into the inside 62 is mixed with the cool cold air distributed by the air mix door 6 on the upstream side of the central outlet 54 and the side outlets 56. The cold air that has been mixed and has reached an appropriate temperature is blown from the central outlet 54 and the side outlets 55 toward the upper body of the vehicle occupant.

(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 positions shown in FIG. That is, the first damper 7
Open the central outlet 54 halfway. Further, the second damper 8 fully closes the window outlet 56. Further, the third damper 9 opens the foot outlet 57 slightly, and opens the warm air passage 59 larger than in the foot blowing mode and the foot / window blowing mode. For example, the third damper 9 opens the warm air passage 59 by θ = 16 °.

Therefore, a large amount of high-temperature hot air sucked from the suction port 53 and heated by the heater core 41 flows into the warm air passage 59 and a small amount 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 hot air that has flowed into the first air passage 61 of the air passage 58 to become a slightly high-temperature cold air. The cold air having a slightly high temperature passes through the first ventilation passage 61 of the ventilation passage 58 and the central outlet.
54, the side air outlet 55 and the foot air outlet 57. Therefore, the slightly high-temperature cold air is blown from the central air outlet 54 and the side air outlet 55 toward the side window glass and the upper body of the vehicle occupant. The high-temperature hot air that has flowed into the hot-air passage 59 in large quantities is mixed with the small amount of slightly-hot cold air that has flowed into the second ventilation passage 62 of the ventilation passage 58 to become a slightly high-temperature warm air. The slightly hot air is blown from the foot outlet 57 toward the feet of the vehicle occupant.

That is, as shown in the graph of FIG. 7, in the bi-level blowing mode (opening θ of the hot air passage 59 = 16 °, indicated by a broken line)
Temperature A1 of the central outlet 54 and side outlets 55
And the temperature difference ΔT1 between the outlet temperature B1 of the foot outlet 57 and the outlet temperature B1 increase (for example, 30 ° C to 40 ° C). Therefore, the temperature difference between the upper and lower sides of the passenger compartment becomes large, and optimal air conditioning for head cold foot heat can be performed.

(In the foot blowing mode or in the 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 third dampers 7 to 9 are shown in FIG. It is set at the position shown in FIG. That is, the first damper 7 fully closes the central outlet 54. Further, the second damper 8 opens the air outlet 56 a little or opens it halfway. Further, the third damper 9 opens the foot outlet 57 wide, and opens the warm air passage 59 smaller than in the bilevel blowout mode. For example, the warm air passage 59 is opened by θ = 5 ° by the third damper 9.

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

Therefore, a large amount of high-temperature hot air that has flowed into the first air passage 61 of the air passage 58 mixes with the cool air that bypasses the heater core 41 and is directed toward the side air outlet 55, the window air outlet 56, and the foot air outlet 57. It becomes hot air with high temperature. This hot air, which is a little hot,
After being guided to the side air outlet 55 and the window air outlet 56 through the first air passage 61 of 58, the air flows into the second air passage 62 of the air passage 58. The slightly high temperature warm air that has flowed into the second ventilation passage 62 becomes high temperature warm air that is mixed with the small amount of high temperature warm air that has flowed into the warm air passage 59. The hot hot air is blown from the foot outlet 57 toward the feet of the vehicle occupant.

On the other hand, the slightly high-temperature hot air guided to the side air outlet 55 and the window air outlet 56 blows out from the window air outlet 56 and the side air outlet 55 toward the front window glass, the side window glass, and the upper body of the vehicle occupant. To be done.

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

FIG. 9 is a graph showing changes in the blowing temperature when the opening degree of the warm air passage 59 in the foot blowing mode is changed. As can be seen from this graph, the opening degree of the warm air passage 59 in the foot blowing mode is the opening degree in the bilevel blowing mode (θ =
It can be said that the temperature difference is smaller when the opening is smaller than the opening in the bi-level blowout mode (θ = 4 °, shown by the solid line) than when it is the same as 16 °, shown by the broken line). In addition, A shows the blowing temperature blown from the side outlet 55, and B shows the blowing temperature blown from the foot outlet 57.

(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 fully closes the central outlet 54. Further, the second damper 8 fully opens the air outlet 56. Further, the third damper 9 fully closes the foot outlet 57.

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

As described above, the third damper 9 of the present embodiment is the foot outlet.
57 air outlet control function, central air outlet 54, side air outlet
It has a function of controlling the temperature of the air blown from 55, the window outlet 56 and the foot outlet 57. Therefore, as compared with the conventional device provided with the hot air guide passage with the switching door that connects the downstream area of the heater core and the upstream area of the window outlet, a dedicated switching door is not required, and the number of parts is reduced. be able to. In addition, since the drive mechanism for the exclusive switching door is not required, the structure is simplified and the cost of the automobile air conditioner 1 is very low.
Becomes

FIG. 10 shows a second embodiment of the vehicle air conditioner of the present invention.
An example is shown.

(Functions having the same functions as those in the first embodiment are designated by the same reference numerals.) In this embodiment, the foot outlet 57 is connected to the first ventilation passage 61 of the communication passage 58.
Formed below. In this case as well, the opening and closing of the foot outlet 57 and the opening and closing of the warm air passage 59 can be performed by the third damper 91, so that the same effect as the first embodiment can be obtained.

FIG. 11 shows a third embodiment of the vehicle air conditioner of the present invention.
An example is shown.

(Functions having the same functions as in the first embodiment are given the same numbers) In this embodiment, the third damper 92 is a butterfly damper. Even in this case, the opening and closing of the foot outlet 57 and the opening and closing of the warm air passage 59 can be performed by the third damper 92, so that the same effect as the first embodiment can be obtained.

(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.

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

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

In this embodiment, the side outlets are used as the first outlets, but the central outlet and the window outlets may be used as the first outlets. In this case, the first damper and the second damper are unnecessary.

In this embodiment, the present invention is used for the air conditioning system for automobiles, but the present invention may be used for a heating system for vehicles that does not have a refrigeration cycle.

[Brief description 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 automobiles,
FIG. 3 is a schematic view showing the setting positions of the dampers in the central blowout mode of the heater unit, FIG. 3 is a schematic view showing the setting positions of the dampers in the bilevel blowout mode of the heater unit, and FIG. 4 is a foot blowout of the heater unit. FIG. 5 is a schematic diagram showing the setting positions of the dampers in the mode, FIG. 5 is a schematic diagram showing the setting positions of the dampers in the footer / window blowing mode of the heater unit, and FIG. 6 is a setting of the dampers in the window blowing mode of the heater unit. It is the schematic which shows a position.
FIG. 7 is a graph showing the relationship between the opening degree of the air mix door and the outlet temperature from each outlet in the bi-level outlet mode, and FIG. 8 is the opening degree of the air mix door and each outlet in the foot outlet mode. It is a graph which shows the relationship with the blowing temperature from. FIG. 9 is a graph showing changes in the blowing temperature when the opening degree of the warm air passage in the foot blowing mode is changed. FIG. 10 shows a second embodiment adopted in the present invention. FIG. 10 is a schematic diagram showing the setting positions of the dampers in the bilevel blowing mode of the heater unit. FIG. 11 shows a third embodiment adopted in the present invention. FIG. 11 is a schematic diagram showing the setting positions of the dampers in the bilevel blowing mode of the heater unit. In the figure, 1 ... Automotive air conditioner, 6 ... Air mix door,
9, 91, 92 ... Third damper (damper), 41 ... Heater core (heating means), 52 ... Heater unit case (casing), 53 ... Suction port, 55 ... Side outlet (first blow) Outlet), 57 ... Foot outlet (second outlet)

Claims (1)

[Claims] 1. A heating means for heating passing air, a suction opening for accommodating the heating means and sucking cool air therein, a window glass and an upper body of a vehicle occupant in a foot blowing mode and a bi-level blowing mode. The first to blow the air flow toward
Air outlet, a second air outlet that blows out an air flow toward the feet of the vehicle occupant in the foot blowing mode and the bi-level blowing mode, and air that has been arranged beside the heating means and has passed through the heating means. Alternatively, the casing having an air passage for guiding the air bypassing the heating means to the first outlet and the second outlet, and the cool air sucked from the inlet disposed in the casing are heated by the heating means. An air mix door which passes through a means and is directed to the first blowout port and the second blowout port and the air which bypasses the heating means and is directed to the first blowout port and the air toward the second blowout port. The casing includes a warm air passage that directly guides the air that has passed through the heating means to the second outlet in the foot blow mode and the bi-level blow mode, and the opening and closing of the second blow outlet and the warm air. Has a damper to perform the opening and closing of the road, the damper, the bi-level air outlet mode of the hot air passage air conditioning apparatus for a vehicle, characterized in that the opening larger than said foot outlet mode.