JP3872164B2 - Air conditioner for automobile - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automotive air conditioner, and more particularly to an automotive air conditioner that includes an evaporator and a heater core in one unit case.
[0002]
[Prior art]
Various recent air conditioners for automobiles have been proposed as so-called integrated automobile air conditioners having a compact overall shape in order to secure a space in the passenger compartment. , 7 are shown. 6 is a longitudinal sectional view, and FIG. 7 is a schematic sectional view taken along the line 7-7 in FIG.
[0003]
This automobile air conditioner is of a type in which an evaporator 2 and a heater core 3 are arranged vertically in one unit case 1. Specifically, an evaporator 2 is arranged below the unit case 1 so that the air passage surface is substantially horizontal, and a heater core 3 is provided above the evaporator 2, that is, the air that has passed through the evaporator 2, that is, The cool air is configured to be diverted at a predetermined ratio by the mix door 4 to the heater core 3 side and the bypass passage 5 side that bypasses the heater core 3.
[0004]
Above the unit case 1, a vent outlet 6 for blowing cool air to the upper body of the occupant and a defrost outlet 7 for blowing air toward the windshield and removing fog are opened. The vent outlet 6 is a vent door. The defroster outlet 7 is opened and closed by 6d, and the defroster outlet 7d is opened and closed. A partition wall 8a having an opening 8 is provided between the vent outlet 6 and the defroster outlet 7.
[0005]
On the side of the unit case 1, a foot air outlet 9 that is opened and closed by a foot door 9 d is provided on the lower rear side of the defrost air outlet 7. As shown in FIG. A foot duct 10 is continuously provided along the side portion.
[0006]
And the cold wind which passed the evaporator 2 is guide | induced to the side in which the mix door 4 is provided by the lower partition wall 11, and is shunted to the heater core 3 side and the bypass channel | path 5 side, but the air heated by the heater core 3 is Then, it is guided along the upper partition wall 12 to the side where the vent door 6d is provided, mixed with the cold air that has passed through the bypass passage 5 slightly downward, and passes through the vent outlet 6 and the opening 8 for defrost blowing. It is led to the outlet 7 or the foot outlet 9.
[0007]
In the integrated automotive air conditioner configured as described above, the evaporator 2 and the heater core 3 are arranged vertically so that the height of the unit case 1 is kept within a predetermined range. Since the size in the direction or the front-rear direction is also small, the unit case 1 can be made extremely compact, the installation space in the vehicle interior can be reduced, and the desired space can be secured even in a narrow vehicle interior. There is.
[0008]
[Problems to be solved by the invention]
However, since this air conditioner places great importance on space, the air ventilation resistance increases as is apparent from the drawings. In particular, it may be difficult to ensure the air volume to the foot outlet 9 from which mainly warm air is blown.
[0009]
The present invention has been made in view of the problems of the prior art as described above, and it is possible to secure a sufficient air volume by reducing the airflow resistance while presuming that the unit case is compact, and has excellent temperature control characteristics. An object is to provide an air conditioner for an automobile.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is directed to a bypass passage side in which a cool air cooled by an evaporator disposed below a unit case is allowed to flow upward, and the heater core side and the heater core are bypassed by a mix door And a partition wall for guiding the air flowing upward from the heater core in the direction of the bypass passage is provided above the heater core, and warm air heated by the heater core is allowed to flow along the upper partition wall. In addition, it is mixed with the cold air that has passed through the bypass passage to form an air flow at a predetermined temperature, or without being mixed, from the vent outlet provided at the upper part of the partition wall or at the front end of the upper partition wall Air conditioning for automobiles that blows into the passenger compartment through the defroster outlet or foot outlet In the device, the partition openings are formed in the straight upper portion of the heater core of the wall, openably to the opening provided sub mix door, the vent port located downstream of the sub-mixing door, the defrost outlet A vent door, a defrost door, and a foot door are provided in the foot outlet so as to be freely opened and closed, and when the submix door is closed, the warm air from the heater core is guided to the bypass passage, and the vent door is opened to open the vent mode. Further, the foot mode in which the vent door is closed and the foot door is opened when the submix door is opened, and the defrost mode in which only the defrost door is opened when the submix door is opened are set .
[0011]
In this manner, the submix door that branches into the air that flows upward from the heater core to the vent outlet and the air that leads to the defrost outlet or the foot outlet is provided rotatably above the heater core. The air flowing to the defrost outlet or the foot outlet does not need to be largely diverted by the partition wall as in the prior art, the ventilation resistance can be reduced, and a sufficient amount of air can be supplied to these outlets.
[0012]
The invention according to claim 2 is characterized in that the submix door can gradually open and close the opening of the partition wall.
[0013]
In this way, when adjusting the ratio of the cool air and the hot air by adjusting the opening of the mix door and adjusting the angle of the sub mix door, the temperature and air volume of the air supplied to each outlet can be adjusted. Fine adjustment is possible, and the temperature control characteristics can be easily adjusted.
The invention according to claim 3 is characterized in that the bi-level mode is set by opening the submix door, the vent door, and the foot door.
In this way, when the opening / closing angle of the submix door 23 is adjusted, not only the temperature difference between the upper and lower sides can be finely controlled, but also the air volume can be finely adjusted.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing an automobile air conditioner according to an embodiment of the present invention, and members common to those shown in FIGS.
[0015]
In FIG. 1, an evaporator 2 is disposed substantially horizontally below the unit case 1 so that outside air or inside air taken from an intake unit (not shown) flows from below the evaporator 2 upward. Refrigerant from a cooling cycle (not shown) circulates in the evaporator 2, and the intake air is cooled by exchanging heat with the intake air. Reference numeral “20” denotes a drain pipe for discharging the condensed water of the evaporator 2.
[0016]
The heater core 3 is inclined and disposed above the evaporator 2. By switching the mix door 4, the air flowing upward from the evaporator 2 is bypassed and flows to the heater core 3. The cooling water of the engine circulates in the heater core 3 and heats the air by exchanging heat with the air passing through the heater core 3 to make the air warm.
[0017]
Thus, by arranging the evaporator 2 and the heater core 3 vertically while keeping the height dimension of the unit case 1 within a predetermined range, the dimensions of the unit case 1 in the vehicle left-right direction and the front-rear direction are reduced. ing.
[0018]
Since the lower partition wall 11 is formed between the evaporator 2 and the heater core 3, the cold air is guided along the lower partition wall 11 to the mix door 4 side.
[0019]
The opening degree of the mix door 4 is adjusted by a motor actuator or the like according to the temperature set by the occupant to fully close the heater core 3 side (position indicated by the phantom line in FIG. 1), and bypass. It is set at a predetermined position between a full hot position FH (a position indicated by a solid line in FIG. 1) for fully closing the passage 5 side. As a result, the cold air from the evaporator 2 is branched at a predetermined ratio to the heater core 3 side and the bypass passage 5 side that bypasses the heater core 3, and the cold air that has flowed through the bypass passage 5 as it is is heated by the heater core 3. Is mixed in the mixing region 21 above the mix door 4 and becomes air adjusted to a predetermined temperature.
[0020]
In general, in an air conditioner for an automobile, cold air is guided to the vent outlet 6 and warm air is guided to the defrost outlet 7 and the foot outlet 9, so that the hot air heated by the heater core 3 is It is preferable that the cool air flows through the opening 22 formed in the nearest upper partition wall 12 to the defrost outlet 7 and the foot outlet 9 and the portion where the cold air is not easily affected by the heater core 3.
[0021]
For this reason, in this embodiment, an opening 22 is provided in the upper partition wall 12 directly above the heater core 3, and a submix door 23 is provided rotatably in the opening 22. It is set as the structure which does not inhibit the compactization of the unit case 1 while utilizing a characteristic.
[0022]
That is, if the submix door 23 is rotated clockwise as shown in FIG. 1 and opened, the warm air heated by the heater core 3 is guided from the opening 22 to the defrost outlet 7 and the foot outlet 9. As in the case shown in FIG. 6, there is no need to make a large detour, the ventilation resistance to the defrost outlet 7 or the foot outlet 9 can be greatly reduced, and a sufficient amount of air is supplied to these outlets 7 and 9. Can supply.
[0023]
Further, if the submix door 23 is turned counterclockwise and closed, the warm air heated by the heater core 3 is guided to the mixing region 21 and mixed with the cool air guided to the bypass passage 5 to obtain a desired temperature. Adjusted to temperature.
[0024]
Moreover, in the present embodiment, fine control is performed corresponding to various air conditioning modes, and the temperature control characteristics are further improved.
[0025]
That is, a partition wall 8a having an opening 8 is provided above the unit case 1 in which the opening degree of the mix door 4 is adjusted to adjust the ratio of cold air and hot air, and the upper portion is opened and closed by the vent door 6d. The vent outlet 6 is opened and closed on the upper rear side of the vent outlet 6 by a differential door 7d. The defrost outlet 7 is opened and closed on the lower rear side of the defrost outlet 7 by a foot door 9d. Foot outlets 9 are opened, and these outlets are opened and closed by doors according to the air conditioning mode.
[0026]
When each door is controlled in accordance with the various air conditioning modes, the opening degree of the mix door 4 is also adjusted to adjust the ratio of cold air to hot air. Simultaneously with the adjustment of the mix door 4, the submix door 23 is adjusted. If the opening degree is adjusted, the temperature and air volume of the air (particularly hot air) supplied to the air outlets 7 and 9 can be finely adjusted, and the temperature control characteristics can be easily adjusted.
[0027]
Next, the operation for each air conditioning mode will be described.
《Bi-level mode》
FIG. 2 is a diagram illustrating the air flow in the bi-level mode. In the bi-level mode, the vent door 6d and the foot door 9d are opened, the cool air from the vent air outlet 6 is blown toward the upper body of the occupant, the warm air from the foot air outlet 9 is blown toward the occupant's feet, and the head is cold. is there.
[0028]
In this mode, the mix door 4 is mainly used in a half-open state, and cool air from the evaporator 2 is allowed to flow at a predetermined ratio to the heater core 3 side and the bypass passage 5 side that bypasses the heater core 3.
[0029]
On the other hand, when the submix door 23 is fully opened as shown in FIG. 2, a part of the cold air from the evaporator 2 rises straight and is blown out from the vent outlet 6, and the other part is heated by the heater core 3. Then, it becomes warm air and is guided to the foot outlet 9 by the submix door 23. Therefore, it is possible to create a bi-level mode in which the temperature difference between the top and bottom fever is large.
[0030]
In this case, by adjusting the opening / closing angle of the submix door 23, not only the temperature difference between the upper and lower sides can be finely controlled, but also the air volume can be finely adjusted. For example, when the submix door 23 is almost closed, the temperature difference between the top and bottom is minimized, and the temperature difference between the top and bottom increases as the degree of opening of the submix door 23 increases, such as when the submix door 23 is slightly opened or opened. It is said that the upper / lower temperature difference in the bi-level mode is normally preferably set to 10 to 20 ° C. However, since the temperature sensation of the occupant and the usage environment of the vehicle are different from each other, The unit according to the present embodiment, which can be set as desired from a wide range, can widely accept user requests.
[0031]
《Bent mode》
FIG. 3 is a diagram illustrating the air flow in the vent mode.
The vent mode is a cooling mode in which cool air from the vent outlet 6 is blown out toward the upper body of the occupant. Therefore, the vent outlet 6 is opened by closing the opening 8 with the vent door 6d, the submix door 23 is also fully closed, and the mix door 4 is rotated a predetermined angle from the full cool FC position (bypass passage 5 fully open). The moved position is selected.
[0032]
As a result, in the mixing region 21, the cool air and the warm air heated by the heater core 3 are mixed, adjusted to a desired temperature, and blown out from the vent outlet 6 into the vehicle compartment to perform cooling.
[0033]
《Foot mode》
FIG. 4 is a diagram illustrating the air flow in the foot mode. In the foot mode, the vent door 6d is closed and only the foot door 9d is opened, or the defrost door 7d is also slightly opened, and the defrost blowing is performed while blowing warm air from the foot outlet 9 toward the occupant's feet or blowing warm air from the feet. In this mode, warm air is blown out from the exit 7 and the interior of the vehicle is heated while clearing the cloudiness of the windows.
[0034]
In this mode, as shown in FIG. 4, the mix door 4 is appropriately selected from the full hot FH (bypass passage 5 fully opened) position to a position rotated by a predetermined angle, and the submix door 23 is in a half-open state. And
[0035]
Thereby, the warm air from the heater core 3 and the cold air from the bypass passage 5 are mixed in the vicinity of the submix door 23, reach a predetermined temperature, pass through the opening 8, and most of the air is distributed from the foot outlet 9 into the vehicle interior, A part is blown out from the defrost outlet 7 toward the window.
[0036]
《Defrost mode》
The defrost mode is a mode in which only the differential door 7d is opened, and hot air is blown mainly toward the inner surface of the windshield or side glass to remove the fogging of the glass. As shown in FIG. Also, the warm air from the heater core 3 is mainly blown to the defrost outlet 7.
[0037]
As described above, in the present embodiment, by switching the submix door 23, the air flowing upward from the heater core 3 can immediately flow to the defrost outlet 7 or the foot outlet 9, and the ventilation resistance is reduced. It is possible to prevent a decrease in the air volume, improve the heating performance and the window clearing performance, and the submix door 23 also functions as an air distribution guide when fully closed, thereby changing the compact structure of the conventional unit. There is nothing.
[0038]
Further, by adjusting the opening / closing angle of the submix door 23 together with the mix door 4, the temperature and the air volume of the supply air (particularly hot air) can be finely adjusted.
[0039]
Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention. In the embodiment described above, the butterfly valve type submix door is used. However, the present invention is not necessarily limited to this and may be a normal cantilever type door.
[0040]
【The invention's effect】
As described above, the invention according to claim 1, provided openably to the opening of the partition wall provided with sub-mixing door above the heater core, closing the vent door sub mix door, the Defurosutodoa and foot doors since you so that to set the various modes by selecting the opening and closing properly, while maintaining a compact structure of the unit, can be reduced airflow resistance, it can supply a sufficient volume of air in these air outlet.
[0041]
According to the second aspect of the present invention, the temperature of the air supplied to each outlet is adjusted by adjusting the angle of the submix door when adjusting the ratio of the cold air and the hot air by adjusting the opening of the mix door. The air flow can be finely adjusted and the temperature control characteristics can be easily adjusted.
In the invention of claim 3, when the submix door, the vent door and the foot door are opened and the bi-level mode is set, adjusting the opening / closing angle of the submix door can not only finely control the temperature difference between the upper and lower sides but also the air volume thereof. It can be finely adjusted.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of the present invention.
FIG. 2 is a diagram showing an air flow in a bi-level mode.
FIG. 3 is a diagram showing an air flow in a vent mode.
FIG. 4 is a diagram showing an air flow in a foot mode.
FIG. 5 is a diagram showing an air flow in a defrost mode.
FIG. 6 is a sectional view showing a unit of a conventional automobile air conditioner.
7 is a schematic cross-sectional view taken along line 7-7 in FIG.
[Explanation of symbols]
1 ... Unit case,
2 ... Evaporator,
3. Heater core,
4 ... Mixed door,
6 ... vent vent,
6d ... vent door ,
7 ... defrost outlet,
7d ... defrost door ,
9 ... Foot outlet,
9d ... Foot door ,
12 ... Upper partition wall,
22 ... opening,
23 ... Submix door.

Claims (3)

A bypass passage (5) that causes the cool air cooled by the evaporator (2) disposed below the unit case (1) to flow upward and bypasses the heater core (3) side and the heater core (3) by the mix door (4). ) Side and a partition wall (12) for guiding the air flowing upward from the heater core (3) in the direction of the bypass passage (5) is provided above the heater core (3). The hot air heated by 3) flows along the upper partition wall (12) and mixes with the cold air that has passed through the bypass passage (5) to form an air flow at a predetermined temperature, or without mixing, the partition wall From the vent outlet (6) provided at the top of (12) or through the defrost outlet (7) or foot outlet (9) from the opening (8) opened at the tip of the upper partition wall (12) For automotive air conditioner that blows into the passenger compartment Leave
An opening (22) is formed immediately above the heater core (3) of the partition wall (12), a submix door (23) is provided in the opening (22) so as to be opened and closed, and the submix door (23 said vent port located downstream of) (6), said defrost outlet (7) and said vent door (6 d to the foot outlet (9)), Defurosutodoa (7 d) and the foot door (9 d), respectively openably provided, also the vent mode, by opening the vent door to (6 d) guides the warm air in the bypass passage (5) from the heater core (3) at the time of closing of the sub-mixing door (23) the vent door upon opening of the sub-mixing door (23) (6 d) closed, said foot mode which opens the foot door (9 d), when further opening of the sub-mixing door (23) Defurosutodoa (7 d) the defrost mode which is open only, especially that you set Automotive air conditioning system to be.   The automobile air conditioner according to claim 1, wherein the submix door (23) can gradually open and close the opening (22) of the partition wall (12). Submix door (twenty three) The vent door (6 d ) And the foot door (9 d ) The vehicle air conditioner according to claim 2, wherein the bi-level mode is set by opening the valve.

Images