JP2000038017A - Air-conditioner for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air-conditioner for an automobile simplified to reduce cost and size, capable of improving performance at cooling time while ensuring an air mix property during temperature conditioning time. SOLUTION: The air-conditioner has a warm air passage H heating a flow of cold air in a case C to flow through a heater core 4, first cold air passage B1 allowing cold air to flow upward in the case C by bypassing the heater core 4, second cold air passage B 2 allowing cold air to flow downward in the case C by bypassing the heater core 4, first mix door 5 adjusting an opening of the warm air passage H, upstream inlet 8 of the second cold air passage B2, and the first cold air passage B1, and a second mix door 6 adjusting an opening of the second cold air passage B2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for an automobile, in which a three-layer flow is formed by arranging two cold airs above and below a warm air in a case to adjust the temperature.

[0002]

2. Description of the Related Art Generally, an air conditioner for a vehicle has an intake unit for introducing inside and outside air, a cooler unit for cooling the introduced air, and a heater unit for heating the introduced air. It is well known that they are united in series in the left-right direction of the vehicle and installed in a narrow space inside an instrument panel in a vehicle interior. However, this air conditioner for automobiles has 3
Since the two units are connected in series, the entire device becomes large, and if it is mounted on a small vehicle, it is not preferable because the narrow interior space of the vehicle becomes smaller. In particular, since the unit is placed even at the foot of the passenger seat, it becomes narrow.

On the other hand, as shown in FIGS. 16 and 17, an evaporator (not shown) and a heater core 4 are provided in a case so as to be arranged vertically in the longitudinal direction of the vehicle. There is something. In such a device, the cooler unit and the heater unit are integrated, and the evaporator and the heater core 4 are arranged close to each other to achieve compactness.

[0004] The air cooled by the evaporator is sent in from the left side in the figure, and is divided into an air flow that passes through the heater core 4 by the mix door 15 and an air flow that bypasses the heater core 4. . In the apparatus shown in FIG. 17, in order to shorten the distance between the evaporator and the heater core 4, the mix door 15 is a flat plate-like door, and the temperature is controlled by sliding the mix door 15 substantially up and down.

[0005] Here, as is well known, a low-temperature low-pressure refrigerant decompressed by an expansion valve or the like during a cooling cycle flows through the inside thereof, and the air introduced therein is cooled by heat exchange with the refrigerant. Is what you do. Further, the "heater core" is one in which high-temperature engine cooling water flows inside, and heats the air introduced therein by heat exchange with the high-temperature engine cooling water.

Then, the warm air heated by the heater core 4 and the cool air flowing bypassing the heater core 4 are mixed in a mix zone 7. The mixed air
At a predetermined temperature, air is distributed from the vent outlet Fv, the foot outlet Ff, or the like toward the vehicle interior according to various air distribution modes, or is blown as cold air or hot air without performing the mixing. Is done. Here, the temperature of the cool air or hot air blown out from each outlet is determined by the mix door 15.
Is controlled by the position.

The various air distribution modes include a vent mode (a mode in which cool air is blown to the upper body of an occupant),
Bi-level mode (a mode in which cold air is blown to the upper body of the occupant and warm air is blown to the lower body, a mode of so-called head-and-foot heat), defrost mode (a mode in which the front and side windows are cleared of fogging), and foot mode (a warm air is blown to the lower body of the occupant) Blowing mode) or a differential foot mode (a mode in which warm air is blown out to the lower body of the occupant while clearing the cloud of the window).

[0008] Of these modes, in the case of the vent mode, since the air is distributed to the upper part of the passenger compartment, the vent outlet Fv is preferably provided at the upper part of the case C to shorten the duct. In the case of the foot mode, since the air is distributed to the lower part in the vehicle compartment, the foot outlet Ff is preferably provided in the lower part of the case C.

Therefore, in a vertical type air conditioner for a vehicle which is installed in an instrument panel at a front part in a vehicle compartment, a vent outlet Fv is provided at an upper part of a case C and a foot outlet Ff is provided at a lower part. I have. In such a device, since the flow path through which the air passes can be shortened, it is possible to ensure a small size, low ventilation resistance, and a high air volume.

As described above, in the vertical type air conditioner for a vehicle, the vent outlet Fv is opened near the side where the cool air flows, and the foot outlet Ff is
Since it is opened near the side where the hot air heated by the heater core 4 flows, in the case of the combined mode in which the cool air and the hot air are respectively blown from the upper and lower outlets such as the bi-level mode, Generally, the temperature difference between the upper and lower parts tends to increase. Moreover, the more the case is made compact by reducing the front and rear dimensions, the more difficult it is to secure a sufficient space for mixing the cool air and the warm air in the case, and the temperature difference between the upper and lower parts is more likely to occur.

Therefore, as shown in FIGS. 16 and 17, the mixing door 15 is composed of two first and second mixing doors 15a and 15b, and the upper cold air passage B
u, a hot air passage 6 and a lower cold air passage Bl,
These opening / closing controls are performed by two mix doors 15a and 15b.
There has been known a configuration employing a configuration performed by the method described in Japanese Patent Application Laid-Open No. HEI 9-175147. In such an apparatus, a three-layer flow can be formed by arranging two cold airs above and below the warm air in the case C to improve the air mixability. That is, it is possible to increase the amount of cool air flowing below the case via the lower cool air passage Bl, and to obtain a desired temperature characteristic by reducing the temperature difference between the upper and lower parts while reducing the size.

[0012]

In an air conditioner for an automobile in which the above three-layer flow is formed, the air cooled by the evaporator at the time of full cooling and in the vent mode is used. Flows through the upper cool air passage Bu and the lower cool air passage Bl in the direction of the arrow in the figure, bypassing the entire heater core 4, and flows toward the vent outlet Fv.

However, the lower cold air passage B
1 is guided upward so as to lick the surface of the heater core 4 and blows out from the vent outlet Fv into the vehicle interior through a vent duct (not shown). There was a problem that would rise.

In order to prevent such heat from being received from the surface of the heater core 4, it is conceivable to close the second mix door 15b for adjusting the degree of opening of the lower cold air passage B1 during full cooling. However, assuming that the mix doors 15a, 15b are gradually moved from the full hot side to the full cool side, first, at the time of full hot, the mix doors 15a, 15b are initially connected to the upper cool air passage Bu and the lower cool air passage B.
1 and these are gradually opened, and after the temperature control, the full cool side, that is, the mix door 15a, 1
5b is fully opened and the second mixed door 15b
A problem arises in that a complicated door operation of switching only the door from fully open to fully closed must be performed.

The present invention has been made to solve the above-mentioned problems of the prior art, and is simple, low-cost, and capable of improving the performance during cooling while ensuring the air mix property during temperature adjustment. It is an object of the present invention to provide a small vehicle air conditioner.

[0016]

According to a first aspect of the present invention, there is provided a hot air passage for flowing cold air flowing through a heater core through a heater core, wherein the hot air bypasses the heater core. A first cool air passage flowing upward in the case; a second cool air passage for flowing the cool air downward in the case bypassing the heater core; an upstream inlet of the hot air passage and the second cool air passage; An air conditioner for an automobile, comprising: a first mix door that adjusts an opening of a cool air passage; and a second mix door that adjusts an opening of the second cool air passage.

According to a second aspect of the present invention, in the air conditioner for a vehicle according to the first aspect, the first mix door is arranged with respect to a center shaft arranged on a downstream side above a front surface of the heater core. Is provided rotatably, and the second
The cool air passage is formed by a cool air duct extending downward in the case along the downstream surface of the heater core from between the center axis and the heater core, and the second mix door is attached to the center axis and By being rotated in the cool air duct, the opening degree of the second cool air passage is adjusted,
The first mix door may adjust an opening of an inlet of the cool air duct.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a sectional view of an air conditioner for a vehicle according to Embodiment 1 of the present invention. In addition,
Components common to those shown in FIGS. 16 and 17 are denoted by the same reference numerals.

The vertical type air conditioner for a vehicle according to the first embodiment shown in FIG. 1 has a case C in which a cooler unit 1 and a heater unit 2 are integrated and the size of the vehicle in the front-rear direction is shortened. An evaporator 3 is provided in an upstream air passage of the case C, and a heater core 4 is provided in a downstream air passage.
Is provided.

The air introduced through the inlet O from the vehicle width direction (perpendicular to the plane of FIG. 1) is bent in the case C in the front-rear direction of the vehicle and cooled through the evaporator 3. It has become. The intake unit for taking in air is disposed on the side surface of the case C, and the length of the device in the vehicle front-rear direction is shortened.

In the case C, the evaporator 3
A hot air passage H through which the cool air cooled through the heater core 4 is heated and flowed, a first cool air passage B1 through which the cool air bypasses the heater core 4 and flows upward in the case C, and the cool air is bypassed through the heater core 4 Thus, a second cold air passage B2 flowing downward in the case C is formed.

In the present embodiment, a foldable first mix door 5 for adjusting the opening of the upstream inlet 8 of the hot air passage H and the second cool air passage B2 and the first cold air passage B1 is provided. In addition, the second cooling air passage B2 has a second opening that adjusts the opening degree.
A mix door 6 is provided rotatably.

The air flowing down from the upstream air passage is selectively supplied to the first cold air passage B1 and the upstream inlet 8 by operating the mixing door 5 provided between the evaporator 3 and the heater core 4. It is flowed or flowed at a predetermined ratio. In addition, by arranging the second mix door 6 downstream of the upstream inlet 8, the air flowing through the upstream inlet 8 to the second cool air passage B <b> 2 can be shut off.

As shown in FIG. 2, the first mixed door 5
The first door 11 is provided rotatably with respect to the central axis 10, and the hinge 13 is provided on the opposite side of the first door 11 from the central axis 10 with respect to the first door 11. A second door portion 12 movably provided. Thereby, the first mix door 5 can be bent or extended at the hinge portion 13. Also, the second
On both sides of the door portion 12, an engagement pin 14 that moves along a guide groove 15 provided in the case C is provided. Therefore, when the first door portion 11 is rotated by rotating the center shaft 10 by an actuator (not shown), the second door portion 12 moves accordingly. Since the dowel pin 14 is moved along the guide groove 15, the mix door 5 can be maintained in a desired bent form and the track as a whole as a whole.

The pin 14 is desirably provided on the tip side of the second door portion 12 from the viewpoint of smoothing the movement of the door, but is not limited to this. In addition, it is good also as a guide rail instead of the said guide groove 15, for example.
In this case, an engaging groove may be formed instead of the engaging pin 14. Further, the hinge portion 13 is, for example, a first door portion 11.
And an engaging shaft portion connected to the end of the second door portion 12 (both not shown). It may be formed of resin.

As shown in FIG. 1, the first mixed door 5
Is arranged on the downstream side above the front surface of the heater core 4, and the second door portion 12 is configured to open and close the front surface of the heater core 4. Thus, the evaporator 3 and the heater core 4 can be provided closer to each other on the upstream side and the downstream side of the first mix door 5, so that the unit can be made more compact.

The second door portion 1 of the first mixed door 5
2 is not limited to a flat plate as shown in the figure, and may be formed to have an arc shape that swells downstream with a predetermined radius of curvature. In this way, the air cooled by passing through the evaporator 3 is caused to flow in the direction of the first cold air passage B1 or the upstream inlet 8 smoothly along the arc-shaped surface of the second door portion. Can be changed.

A vent outlet Fv and a differential outlet Fd are opened at the upper part of the case C, and a foot outlet F is provided at the lower part.
f is opened, and each mode door D (vent door Dv, differential door Dd, foot door Df) that opens and closes each outlet F (vent vent Fv, differential outlet Fd, foot outlet Ff). ) Is provided so as to be rotatable in the direction of the arrow shown in the figure. Further, a mix zone 7 for mixing the warm air heated by the heater core 4 and the cool air flowing bypassing the heater core 4 is formed, and the mixed air is supplied to various outlets according to various air distribution modes. F
The air is blown into the passenger compartment from outside, or is blown out as cold air or hot air without being mixed.

Next, the operation of the first embodiment will be described. FIG. 3 is a cross-sectional view for explaining the position of the mix door and the flow of air during full cooling.

In the vent mode, when the cool air is blown into the passenger compartment without heating the entire amount of the cool air, the first mixed door 5 has the most bent degree of the first door portion 11 and the second door portion 12 as shown in FIG. The state is reduced, and the second door portion 12 is set at the lower end position. The vent mode is a mode for cooling the vehicle interior, in which the vent door Dv is set to "open", the foot door Df is set to "closed", and the differential door Dd is set to "closed".

As described above, at the time of full cooling, the upstream inlets 8 of the hot air passage H and the second cold air passage B 2
The second door portion 12 of the mix door 5 closes and the first cool air passage B1 opens.

Accordingly, the air flow cooled by the evaporator 3 flows through the first cold air passage B1 in the direction of the arrow in the drawing while keeping the cool air, and then passes through the vent duct (not shown) from the vent outlet Fv. It is distributed to the passenger compartment. Further, the flow path through which air passes from the first cold air passage B1 toward the vent outlet Fv is short, and the airflow resistance is reduced. Thereby, a high air volume can be secured, and a large amount of cold air is guided into the vehicle interior.

Here, the upstream side inlet 8 of the second cold air passage B2
Is closed, no cold air flows through the second cool air passage B2 regardless of the opening degree of the second mix door 6. Therefore, it is possible to prevent a rise in temperature due to the cool air passing from the second cool air passage B2 near the surface of the heater core and being sent to the vent outlet Fv, thereby improving cooling performance.

Further, since the upstream inlet 8 of the second cold air passage B2 is opened and closed by the first mix door 5, the second mix door 6 is used when the temperature adjustment is changed from the full hot side to the full cool side. Can be simply changed from “closed” to “open”, and a small and simple configuration can be achieved without complicating the control and the mechanical configuration, resulting in low cost.

Further, since it is possible to easily form the vertical wall 9 having a predetermined height from the lower surface of the evaporator 3, it is possible to prevent the condensed water from flowing from the evaporator 3.

FIG. 4 is a cross-sectional view for explaining the position of the mix door and the flow of air during temperature control.

At the time of temperature control, the first mixed door 5
As shown in FIG. 4, the first door portion 11 and the second door portion 12 are in a state where the degree of bending is intermediate, and the second door portion 12 is set at an intermediate position in the vertical direction. Also, the second
The mix door 6 also has an intermediate opening.

Therefore, a part of the air flow cooled by the evaporator 3 flows in the arrow direction in the figure from the upstream inlet 8 through the lower part of the first mix door 5, passes through the hot air passage H, and flows through the heater core 4. As a result, the hot air is heated to reach the mix zone 7 and passes through the second cold air passage B2 to reach the mix zone 7 while keeping the cool air. In addition, the remaining airflow flows through the upper part of the first mix door 5 in the direction of the arrow in the drawing, with the cool air remaining, and reaches the mix zone 7 from the first cool air passage B1.

The hot air passing through the hot air passage H, the cold air passing through the first cold air passage B1, and the cold air passing through the second cold air passage B2 collide in the mix zone 7 and are mixed.
It is adjusted to a predetermined temperature. Thus, by mixing the three layers of air flow in the mix zone 7, the cool air and the warm air are sufficiently mixed, and the air mix property of both is improved. Therefore, the temperature difference between the upper and lower portions in the case C is reduced to have a desired temperature characteristic, and a comfortable temperature control state without a sense of incongruity is achieved.

FIG. 5 is a cross-sectional view for explaining the position of the mix door and the flow of air at the time of full hot.

In the foot mode, when the hot air from the evaporator 3 is fully heated by the heater core 4 and blown out into the vehicle interior, the first mix door 5 is in the state shown in FIG.
As shown in FIG. 5, the first door portion 11 and the second door portion 12 are in a state of being bent most, and the second door portion 12
Is set to the upper end position. The foot mode is a mode for heating the vehicle interior. At this time, the vent door Dv is set to "closed", the foot door Df is set to "open", and the differential door Dd is set to "closed".

Thus, at the time of full hot, the first
The cold air passage B1 is connected to the first door portion 11 of the first mixed door 5.
, The second cool air passage B2 is closed by the second mix door 6, and the warm air passage H is opened.

Therefore, the air flow cooled by the evaporator 3 is entirely heated by the heater core 4 through the hot air passage H in the direction of the arrow in the drawing to become hot air, and this hot air flows into the foot outlet Ff. The air is distributed from the foot duct (not shown) toward the feet of the occupant. Further, the flow path through which the air passes toward the foot outlet Ff is short, and a high air volume can be secured.

As described above, the first door 11 and the second door 12 can be bent or extended in a desired form to operate the first mixing door 5, and therefore the first mixing door 5 can be operated. Operating space can be reduced. As a result, the unit can be made more compact.

(Embodiment 2) FIG. 6 is a sectional view of an automotive air conditioner according to Embodiment 2 of the present invention. This embodiment is different from the first embodiment in that the first mix door 5 is constituted by a single plate-shaped door rotatably provided on a center shaft 10. However, the other points are the same as those of the first embodiment. Members common to those shown in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted. According to this embodiment, the cool air is also supplied to the second cool air passage B2.
From near the surface of the heater core and vent outlet Fv
, It is possible to prevent the temperature from rising due to the air being sent to the air conditioner, and to improve the cooling performance.

(Embodiment 3) FIG. 7 is a sectional view of an air conditioner for a vehicle according to Embodiment 3 of the present invention. This embodiment is different from the first embodiment in that the first mix door 5 is configured by a plate-shaped door that slides and controls the airflow of hot air and cold air. However, the other points are the same as in the first embodiment, and FIG.
The same reference numerals are given to members common to the members shown in FIG.

The first mix door 5 of this embodiment is extended between the evaporator 3 and the heater core 4 in the direction of blocking the airflow from the upstream air passage and swells downstream with a predetermined radius of curvature. It has an arc shape. As shown in the drawing, the first mix door 5 has a vertical direction that is approximately half the opening of the upstream air passage and the downstream air passage, and a width direction extending from one side of the case C to the other side. It is a thing. The slide drive mechanism for operating the first mix door 5 is configured to drive a pair of gears G meshing with teeth formed near both side ends of the first mix door 5 by a motor or the like. The slide drive mechanism is not limited to this, and may be a manual operation mechanism connected to the controller via a wire cable in some cases.

According to this embodiment, the evaporator 3 and the heater core 4 are brought closer to each other to reduce the size, and at the same time, the cool air is passed from the second cool air passage B2 near the surface of the heater core to the vent outlet Fv. It is possible to prevent a rise in temperature due to this.

(Embodiment 4) FIG. 8 is a sectional view of an essential part of a vehicle air conditioner according to Embodiment 4 of the present invention, and FIG.
FIG. 10 is a perspective view of a mix door, and FIG. 10 is a perspective view of a cool air duct. As in the first embodiment, the first mixed door 5
Is a first door unit 1 that is provided rotatably with respect to a center shaft 10 that is disposed downstream and above the front surface of the heater core 4.
1 and a second door portion 12 which is provided rotatably with respect to the first door portion 11 and adjusts the opening of the front surface of the heater core 4. In addition, the cross section shown by the black spot around the mix door in the figure represents the seal member.

In this embodiment, the second cold air passage B2
Is located between the center axis 10 and the heater core 4.
Is formed by a cold air duct 16 extending downward in the case C along the downstream surface of the case C. In FIG. 10, the rear surface (the right front side in the figure) is illustrated with an opening.
Will be located. An expanded portion 16a is formed in a lower portion of the cool air duct 16, so that the cool air can be guided widely downward in the case C. FIG.
As shown in FIG. 1, the vertical wall 16b on the side of the heater core 4 may be formed into a mountain shape or an arc surface so that the heater core 4 is more convex. In this way, the warm air that has passed through the heater core 4 can be flowed smoothly into the right and left parts.

The second mix door 6 has a central shaft 10.
And rotated in the cold air duct 16 so that the second
The opening degree of the cold air passage B2 is adjusted. That is, both the first mix door 5 and the second mix door 6 are integrally attached to the center shaft 10 to form a butterfly structure mix door Dm.

The opening of the inlet 8a of the cool air duct 16 is adjusted by the first door portion 11 of the first mix door 5. Further, an inlet 8b is formed on the front surface of the heater core 4, and these inlets 8a and 8b form the upstream inlet 8 of the hot air passage H and the second cold air passage B2. The other points are the same as those of the first embodiment. Members common to those shown in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.

Next, the operation of the fourth embodiment will be described. FIG. 12 is a cross-sectional view for explaining the position of the mix door and the flow of air during full cooling.

In the vent mode, when the cool air is blown into the vehicle compartment without heating the entire amount, the mixed door 5
As shown in FIG. 12, the first door portion 11 and the second door portion 12 are in a state in which the degree of bending is the least, and the second door portion 12 is set at the lower end position. That is, at the time of full cooling, the entrance 8b of the hot air passage H is closed by the second door portion 12 of the first mix door 5, and at the same time, the entrance 8a of the second cool air passage B2 is closed by the first mix door 5. Is closed by the first door portion 11, while the first cold air passage B1 is opened. Accordingly, the air flow cooled by the evaporator 3 passes through the first cold air passage B1 in the direction of the arrow in the drawing and the vent
v.

Also in this embodiment, at the time of full cooling, the entrance 8a of the second cool air passage B2 is closed, so that the second mix door 6 is opened but the cool air flows through the second cool air passage B2.
The air does not pass from the cold air passage B2 near the surface of the heater core to the vent outlet Fv.

FIG. 13 is a cross-sectional view for explaining the position of the mix door and the flow of air during temperature control.

At the time of temperature control, the first mixed door 5
As shown in FIG. 13, the first door portion 11 and the second door portion 12 are in an intermediate bending degree, and the second door portion 12 is set to an intermediate position in the vertical direction,
The second mix door 6 also has an intermediate opening with respect to the second cold air passage B2.

Therefore, a part of the air flow cooled by the evaporator 3 flows in the arrow direction in the drawing from the inlet 8 b through the lower part of the first mix door 5, passes through the hot air passage H, and is heated by the heater core 4. As a result, the hot air reaches the mix zone 7 and flows in from the inlet 8a through a lateral gap between the first door portion 11 and the second door portion 12 of the first mix door 5, and the second cool air It passes through the passage B2 to reach the mix zone 7 with the cool air. In addition, the remaining airflow flows through the upper part of the first mix door 5 in the direction of the arrow in the drawing, with the cool air remaining, and reaches the mix zone 7 from the first cool air passage B1.

The hot air passing through the hot air passage H, the cold air passing through the first cold air passage B1, and the cold air passing through the second cold air passage B2 form an air flow as indicated by a dashed line arrow in FIG. And collides and mixes in mix zone 7,
It is adjusted to a predetermined temperature. Therefore, also in this embodiment, by mixing the three layers of the air flow of the warm air and the cool air in the mix zone 7, the cool air and the warm air are sufficiently mixed, and the air mix property of both is improved.

FIG. 15 is a cross-sectional view for explaining the position of the mix door and the flow of air during full hot.

In the foot mode, when the hot air from the evaporator 3 is fully heated by the heater core 4 and blown into the vehicle interior, the first mix door 5 is in the position shown in FIG.
As shown in FIG. 5, the first door portion 11 and the second door portion 12
Of the second door portion 1
2 is set at the upper end position. That is, at the time of full hot, the first cold air passage B1 is
At the same time as being closed by the door section 11, the second cool air passage B2 is closed by the second mix door 6, while the hot air passage H is opened.

Accordingly, the air flow cooled by the evaporator 3 is entirely heated by the heater core 4 through the hot air passage H in the direction of the arrow in the figure to become hot air, and this hot air flows into the foot outlet Ff. .

As described above, according to the present embodiment, the same effects as those of the first embodiment can be obtained, and the first mix door 5 and the second mix door 6 are integrally formed in a butterfly structure. Therefore, parts such as links and levers for linking the two are not required, and the number of parts can be reduced.
Further cost reduction is achieved. Further, since there is no need to provide a cool air passage below the heater core 4, further downsizing can be realized. Further, the assembling work is also facilitated, and the number of working steps can be reduced.

The embodiments described above are not described to limit the present invention, and various modifications can be made by those skilled in the art within the technical concept of the present invention.

For example, in the above-described fourth embodiment, the first mix door 5 is provided with a first door portion 11 which is provided rotatably with respect to the center axis 10, and which is rotatable with respect to the first door portion 11. Although the present invention is not limited to this, the present invention is not limited to this, and is constituted by a single plate-like door rotatably provided on the central shaft 10. It is also possible.

[0067]

As described above, according to the first aspect of the present invention, the cool air passes from the second cool air passage near the surface of the heater core at the time of full cooling while ensuring the air mixing property at the time of temperature adjustment. Thus, it is possible to prevent the temperature from rising due to the above-mentioned operation, and to improve the performance during cooling. Further, since the upstream side entrance of the second cold air passage is opened and closed by the first mix door, a small and simple configuration can be achieved, and the cost is reduced. Furthermore, since a vertical wall having a predetermined height can be easily formed above the lower surface of the evaporator, it is possible to prevent the condensed water from flying.

According to the second aspect of the invention, in addition to the effects of the first aspect of the invention, both the first mix door and the second mix door are mounted on the central shaft, so that both are mixed. A mechanism for interlocking is not required, so that the number of components can be reduced and cost can be further reduced. Also,
Since there is no need to provide a passage below the heater core, further downsizing can be realized. Further, the assembling work is also facilitated, and the number of working steps can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an automotive air conditioner according to Embodiment 1 of the present invention.

FIG. 2 is a perspective view of a first mix door of the apparatus.

FIG. 3 is a cross-sectional view for explaining the position of a mix door and the flow of air during full cooling.

FIG. 4 is a cross-sectional view for explaining the position of a mix door and the flow of air during temperature control.

FIG. 5 is a cross-sectional view for explaining the position of a mix door and the flow of air during full hot.

FIG. 6 is a cross-sectional view of an automotive air conditioner according to Embodiment 2 of the present invention.

FIG. 7 is a cross-sectional view of an automotive air conditioner according to Embodiment 3 of the present invention.

FIG. 8 is a cross-sectional view of a main part of an automotive air conditioner according to Embodiment 4 of the present invention.

FIG. 9 is a perspective view of a mix door of the apparatus.

FIG. 10 is a perspective view of a cool air duct of the apparatus.

FIG. 11 is a perspective view showing a modification of the cool air duct.

FIG. 12 is a cross-sectional view for explaining the position of a mix door and the flow of air during full cooling.

FIG. 13 is a cross-sectional view for explaining the position of a mix door and the flow of air during temperature control.

FIG. 14 is a perspective view schematically showing the flow of air during temperature control.

FIG. 15 is a cross-sectional view for explaining the position of the mix door and the flow of air during full hot.

FIG. 16 is a schematic sectional view showing a conventional automobile air conditioner.

FIG. 17 is a schematic sectional view showing a conventional air conditioner for a vehicle.

[Explanation of symbols]

 3 evaporator, 4 heater core, 5 first mix door, 6 second mix door, 7 mix zone, 8 upstream inlet 8a, 8b inlet (upstream inlet), 10 central axis, 16 ... Cold air duct, B1: first cold air passage, B2: second cold air passage, H: hot air passage, C: case.

Claims (2)

[Claims] The cooling air flowing through the case (C) is heated by a heater core.
A hot air passage (H) for heating and flowing through the (4); and a case (C) for bypassing the cold air through the heater core (4).
A first cool air passage (B1) flowing inward and upward, and a case (C) which bypasses the cool air by the heater core (4).
Opening adjustment of the second cold air passage (B2) flowing inward and downward, the upstream inlet (8) of the hot air passage (H) and the second cold air passage (B2), and the first cold air passage (B1) First
A mixing door (5), and a second mixing door for adjusting an opening of the second cold air passage (B2).
(6) An air conditioner for a vehicle, comprising: 2. A central shaft disposed on the downstream side of the front surface of the heater core (4) with respect to the first mix door (5).
The second cold air passage (B2) is provided rotatably with respect to (10), and extends along a downstream surface of the heater core (4) from between the center axis (10) and the heater core (4). The second mix door (6) is attached to the center shaft (10) and is rotated in the cool air duct (16) by a cold air duct (16) extending downward inside the case (C). Thereby, the opening degree of the second cool air passage (B2) is adjusted, and the first mix door (5) adjusts the opening degree of the inlet (8a) of the cool air duct (16). Item 4. An automotive air conditioner according to Item 1.