JP2003341343A - Vehicular air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To uniformize the front wind speed distribution of a heater core 13 even if a vehicular air conditioner has such a constitution that a seal wall face 18 which rises upward from the lower part of the heater core 13 is arranged on the upstream side of the air flow of the heater core 13. <P>SOLUTION: A cool air bypass channel 15 is provided on the upper side of the heater core 13, an air mix door 16 is made to be rotatable around a rotary shaft 16a near the heater core 13 upper part. At a maximum cooling time when an inlet air flow passage 17 is fully closed by the air mix door 16, the tip of the air mix door 16 is made to abut on the upper end of the seal wall face 18. Furthermore, an air guide plate 19 which guides air flowing through the inlet air flow passage 17 from the upper part of the heater core 13 to the lower side is disposed at the inlet air flow passage 17. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioner having a guide structure for equalizing the air flow in a heating heat exchanger that exchanges heat with the air blown into the vehicle interior.

[0002]

2. Description of the Related Art In recent years, with the miniaturization of an air conditioning unit of a vehicle air conditioner, the space of an air passage around a heat exchanger for heating has been narrowed, resulting in a forced air passage shape. There is.

FIG. 6 shows a typical example of a conventional air conditioning unit 10, in which a cooling heat exchanger 12 and a heating heat exchanger 13 are integrally built in an air conditioning case 11. Since the air conditioning unit 10 is installed in a narrow space inside the vehicle instrument panel, there is a strong demand for downsizing the physique in the vehicle front-rear direction (left-right direction in FIG. 6). As a result, the space in the vehicle front-rear direction between the cooling heat exchanger 12 and the heating heat exchanger 13 is narrowed, and the length L of the air mix door 16 is reduced.
Is restricted.

In order to reduce ventilation resistance in the face mode in which the face opening 27 is opened, the cold air bypass passage 1 is provided.
5 is arranged above the heat exchanger 13 for heating. Along with this, the rotary shaft 16a of the air mix door 16 is also arranged near the upper portion of the heating heat exchanger 13.

As a result, a seal wall surface 18 which rises upward from the lower portion of the heating heat exchanger 13 is arranged on the upstream side of the heating heat exchanger 13 in the air flow direction, and the air-mix door 16 of the air mix door 16 is provided at the time of maximum cooling. As shown by the chain double-dashed line in FIG. 6, the tip end portion is brought into contact with the upper end portion of the seal wall surface 18 to completely close the inlet ventilation passage 17 of the heating heat exchanger 13.

[0006]

The conventional air conditioning unit 1
According to 0, when the air mix door 16 is operated to the position shown by the solid line in FIG. 6 and the air passage of the heating heat exchanger 13 is fully opened, the seal wall surface 18 interferes with the air flow during the maximum heating. It becomes difficult for air to flow into the lower part of the core portion 13 a of the No. 13. As a result, a large deviation occurs in the front wind velocity distribution of the heating heat exchanger 13. That is, there is a relationship that the wind velocity distribution in the upper part of the heat exchanger 13 for heating> the wind velocity distribution in the lower part. This causes the heat exchanger 1 for heating.
Since the heat exchange efficiency of No. 3 and the maximum heating capacity are reduced, the required capacity may not be secured in some cases.

In view of the above points, the present invention has a structure in which a seal wall surface that rises upward from the lower portion of the heating heat exchanger is arranged upstream of the heating heat exchanger in the air flow. An object of the present invention is to provide an air conditioning system for a vehicle that can make the front wind velocity distribution of a heat exchanger uniform.

[0008]

In order to achieve the above-mentioned object, in the invention according to claim 1, the heating heat exchanger (1
3) Inlet ventilation passage (17) and cold air bypass passage (15)
In a vehicle air conditioner including an air mix door (16) for opening and closing, a heating heat exchanger (13) is provided substantially vertically in an air conditioning case (11), and a cold air bypass passage (15) is provided in the air conditioning case ( 11) is provided above the heat exchanger for heating (13), and the air mix door (1
6) is rotatable about a rotary shaft (16a) arranged near the upper part of the heating heat exchanger (13), and is located at an air flow upstream side portion of the heating heat exchanger (13). ,
A seal wall surface (18) that rises upward from near the lower part of the heating heat exchanger (13) is provided, and the inlet air passage (17) is fully closed by the air mix door (16) to form the cold air bypass passage (15). At the time of maximum cooling when fully opened, the tip of the air mix door (16) comes into contact with the upper end of the seal wall surface (18), and further, the air flow in the inlet ventilation passage (17) is changed to the heat exchanger for heating. An air guide plate (19) for guiding from the upper part to the lower part of (13) is arranged in the inlet ventilation passage (17).

According to this, the seal wall surface (18) rising from the lower portion of the heating heat exchanger (13) to the upper side is arranged on the upstream side of the heating heat exchanger (13) in the air flow. Also, the air guide plate (19) can guide the air flow in the inlet ventilation passage (17) from the upper part to the lower part of the heating heat exchanger (13). As a result, the front wind speed distribution of the heating heat exchanger (13) can be made uniform, and the maximum heating capacity of the heating heat exchanger (13) can be improved.

According to the invention described in claim 2, claim 1
In the above, if the air conditioning case (11) is made of resin and the air guide plate (19) is integrally formed with the air conditioning case (11), the air guide plate (19) can be easily formed at low cost.

According to a third aspect of the present invention, in the first or second aspect, the air guide plate (19) is provided from the left and right ends in the width direction of the heating heat exchanger (13) to the heating heat exchanger (13). ) Is arranged so as to project inward by a predetermined amount (W1) in the width direction, and a gap (19a) through which air passes is set between the tip ends of the air guide plates (19) on both the left and right sides. And

As a result, the air guide plates (1
Since air passes through the space (19a) set between the tip portions of 9), the increase in pressure loss due to the arrangement of the air guide plate (19) can be suppressed to a very small amount.

The invention according to claim 4 is characterized in that, in claim 3, the gap (19a) has a dimension (W2) larger than the protrusion amount (W1) of the air guide plate (19). To do.

As a result, the increase in pressure loss due to the arrangement of the air guide plate (19) can be suppressed to a much smaller amount. Moreover, the protrusion amount (W1) of the air guide plate (19) <
By setting the dimensional relationship of the size (W2) of the space (19a), it is possible to prevent the air guide plate (19) from collapsing at the time of molding, and to avoid problems caused by the collapse of the air guide plate (19).

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the air guide plate (19) is provided in the inlet ventilation passage (17) in an upper region of the heating heat exchanger (13). The air guide plate (19) is provided with a space (19b) between the upper end of the air guide plate (19) and the rotating shaft (16a) of the air mix door (16), and the lower end of the air guide plate (19) is set. It is characterized in that the part is arranged near the central part in the vertical direction of the heating heat exchanger (13).

As a result, the heating heat exchanger (1) is passed through the space (19b) located above the air guide plate (19).
An appropriate amount of air can be made to flow into both the left and right sides of the upper side region of 3), and the air guide plate (19) is provided.
By the guide action of, the air can be positively guided below the central portion of the heating heat exchanger (13).

The reference numerals in parentheses of the above-mentioned means indicate the correspondence with the concrete means described in the embodiments described later.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIG. The indoor unit portion of the vehicle air conditioner according to the present embodiment is roughly classified into the air conditioning unit 10 shown in FIG.
And a blower unit (not shown) for blowing air to the air conditioning unit 10.

The air conditioning unit 10 is arranged at a substantially central portion in the vehicle width (left and right) direction inside the instrument panel (not shown) in the front portion of the vehicle compartment. The air conditioning unit 10 part is arranged in the mounting direction indicated by the arrow in FIG. 1 with respect to the front-rear direction and the up-down direction of the vehicle at a substantially central portion inside the instrument panel in the vehicle compartment.

On the other hand, the blower unit (not shown) is arranged offset from the central portion to the passenger seat side inside the instrument panel in the front portion of the vehicle compartment. As is well known, the blower unit includes an inside / outside air switching box for selectively introducing outside air (air outside the vehicle compartment) and inside air (air inside the vehicle compartment), and a centrifugal blower for sucking and blowing air through the inside / outside air switching box.

The air conditioning unit 10 is a resin air conditioning case 1
1, the inside of the air conditioning case 11 is formed with an air passage through which air flows toward the vehicle interior. The air-conditioning case 11 is specifically configured by integrally fastening a left-side split case and a right-side split case, which are split left and right at a split surface at the center in the vehicle width direction.

In the air conditioning case 11, an evaporator 12 which constitutes a heat exchanger for cooling and a heater core 13 which constitutes a heat exchanger for heating are provided.
Both are integrated in one. An air inlet space 14 is formed in a portion of the air conditioning case 11 that is closest to the front side of the vehicle. The blown air flows into the air inlet space 14 from the scroll casing outlet of the centrifugal blower of the blower unit.

Air inlet space 1 in air-conditioning case 11
The evaporator 12 is arranged in the vertical direction (substantially vertical) at a position immediately after 4. As is well known, the evaporator 12 absorbs latent heat of vaporization of the refrigerant of the refrigeration cycle from the conditioned air to cool the conditioned air. The heater core 13 is arranged at a predetermined interval on the air flow downstream side of the evaporator 12, that is, on the vehicle rear side. Therefore, the air that has flowed into the air inlet space 14 in the air conditioning case 11 is
2. It passes through the heater core 13 in this order and flows from the vehicle front side to the vehicle rear side.

The heater core 13 is arranged substantially vertically in the air conditioning case 11. Here, arranging the heater core 13 in a substantially vertical direction means that the heat exchange core portion 13a described below is provided.
Is to be arranged so that the surface of is extended substantially in the vertical direction. In the present embodiment, the heater core 13 is arranged in a substantially vertical direction with a small angle so that the upper end of the heater core 13 is located on the vehicle rear side of the lower end.

The heater core 13 reheats the cold air that has passed through the evaporator 12, and hot hot water (engine cooling water) flows from an unillustrated vehicle engine inside the heater core 13.
The hot water is used as a heat source to heat the air. The heater core 13 has a well-known configuration in which tank portions 13b and 13c are arranged on the upper and lower sides of a heat exchange core portion 13a composed of a flat tube and corrugated fins.

A cold air bypass passage 15 is formed in the upper portion of the heater core 13. The cold air bypass passage 15 forms a passage through which the cool air that has passed through the evaporator 12 bypasses the heater core 13. The cold air bypass passage 15 is provided between the evaporator 12 and the heater core 13.
An air mix door 16 formed of a flat plate door is rotatably arranged around a rotating shaft 16a at a lower portion of the.

Here, the rotary shaft 1 of the air mix door 16
6a is arranged near the upper part of the heater core 13. In the example of FIG. 1, the rotating shaft 16a is arranged in the vehicle front side portion of the upper tank 13c of the heater core 13 so as to extend in the vehicle width direction (the direction perpendicular to the plane of FIG. 1).

The rotary shaft 16a of the air mix door 16 is rotatably supported by bearing holes (not shown) on the left and right wall surfaces of the air conditioning case 11. Then, one end of the rotating shaft 16a projects to the outside of the air conditioning case 11 and is connected to a temperature adjusting operation mechanism via a link mechanism (not shown). The temperature adjusting operation mechanism rotates the air mix door 16. This temperature adjusting operation mechanism is composed of an electric drive mechanism using a servo motor, and rotates the air mix door 16 by the rotational power of the servo motor. However, as the temperature adjusting operation mechanism, a manual method in which the air mix door 16 is directly rotated by the occupant's manual operation force may be used.

The air mix door 16 adjusts the opening degree of the cold air bypass passage 15 and the inlet air passage 17 of the heater core 13 so that the heater core 1 passes through the inlet air passage 17.
Hot air (arrow a) heated by the core part 13a for heat exchange of No. 3
And the air flow rate of the cold air (arrow b) passing through the cold air bypass passage 15 are adjusted.

In FIG. 1, the air mix door 1
The lower two-dot chain line position of 6 is the maximum cooling position (door opening = 0%) in which the inlet air passage 17 is fully closed and the cold air bypass passage 15 is fully opened, and the upper solid line position is the inlet air passage. 1
7 is the maximum heating position (door opening = 100%) in which 7 is fully opened and the cold air bypass passage 15 is fully closed. And the lower 2
By rotating the air mix door 16 to an intermediate opening position (broken line position) between the position indicated by the dashed-dotted line and the position indicated by the upper solid line, hot air and cold air are mixed to adjust the temperature of the blown air to a desired intermediate temperature. can do.

A seal wall surface 18 which rises upward from the vicinity of the lower portion of the heater core 13 is provided at a portion of the heater core 13 upstream of the air flow (in front of the vehicle). The seal wall surface 18 defines the lower end portion of the opening range of the inlet air passage 17 of the heater core 13, and at the maximum cooling position, the tip of the air mix door 16 is the seal wall surface 1).
The inlet ventilation passage 17 is fully closed by abutting on the upper end of the.

The seal wall surface 18 is a resin air conditioning case 11
In the vehicle width direction (the direction perpendicular to the paper surface of FIG. 1), it is formed over the entire internal space of the air conditioning case 11.

In the inlet ventilation passage 17 of the heater core 13, an air guide plate 19 is arranged in an upper region of the heater core 13. The air guide plate 19 guides the air flow in the inlet ventilation passage 17 from the upper side to the lower side of the heater core 13, and is integrally formed with the air conditioning case 11 made of resin.

FIG. 2 is a view taken in the direction of arrow A in FIG. 1 and specifically illustrates the arrangement of the air guide plate 19, and the width of the heater core 13 in the upper region on the upstream side of the air flow of the heater core 13. Heater core 1 from both left and right
The air guide plate 19 is arranged so as to protrude by a predetermined amount W1 inward in the width direction of the sheet 3. This predetermined protrusion amount W1
Is sufficiently smaller than the widthwise dimension W0 of the heater core 13, so that the widthwise dimension W2 between the tip portions of the air guide plates (19) on both the left and right sides is sufficiently larger than the protrusion amount W1.
It is possible to set the void 19a having

Here, the protrusion amount W1 is, for example, 50 mm, and the widthwise dimension W0 of the heater core 13 is, for example, 24.
Since it is about 0 to 260 mm, the width dimension W of the void 19a
2 is, for example, about 190 to 210 mm, and the protrusion amount W
The size is sufficiently larger than 1.

Further, as shown in FIG. 1, a space 19b is formed between the upper end of the air guide plate 19 and the rotary shaft 16a of the air mix door 16 at a predetermined interval.
The air also passes through b. This void 19b
The interval H1 (see FIG. 5B described later) is, for example, 20 to 20.
It is about 30 mm. Height dimension H2 of air guide plate 19
Is about the same as the protrusion amount W1, for example, 50 mm. The air guide plate 19 shown in FIG. 2 has a square shape.

Also at the maximum cooling position of the air mix door 16 (the position indicated by the chain double-dashed line in FIG. 1), the air guide plate 1
The position of the upper end portion of the air guide plate 19 is set so that a minute gap is formed between the upper end portion of 9 and the air mix door 16.

The lower end of the air guide plate 19 is arranged near the center of the heater core 13 in the vertical direction. The distance H3 between the lower end position of the air guide plate 19 and the upper end portion of the heat exchange core portion 13a of the heater core 13 is 60 to 80.
It is about mm. The dimensions H2 and H3 are also shown in FIG. 5B described later.

On the other hand, a warm air passage 20 having a curved shape is formed from the vehicle rear side portion of the heater core 13 to the upper portion of the heater core 13. The hot air passage 20 is a passage through which the hot air that has passed through the heat exchanging core portion 13a of the heater core 13 flows, and its outlet portion is above the heater core 13 and the air mix door 16 and is downstream of the cool air bypass passage 15. And an air mixing portion 21 that mixes cold air and warm air.

Next, a defroster opening 22 into which conditioned air whose temperature has been adjusted is introduced from the air mixing portion 21 is opened at an intermediate portion in the vehicle front-rear direction on the upper surface of the air conditioning case 11. The defroster opening 22 is connected to a defroster outlet on the upper surface of the instrument panel through a defroster duct (not shown), and the conditioned air (mainly warm air) is blown from the defroster outlet toward the inner surface of the vehicle front window glass. .

The defroster opening 22 is opened and closed by a flat defroster door 23. This defroster door 23
Is rotatable about a rotary shaft 23a, and switches the defroster opening 22 and the communication port 24 to open and close. The communication port 24 serves as a passage for flowing the conditioned air from the air mixing unit 21 toward the face opening 25 and the foot opening 26.

The face opening 25 is provided on the upper surface of the air conditioning case 11 at a position rearward of the vehicle (closer to the occupant) than the defroster opening 22. The face opening 25 is connected to a face outlet (not shown) arranged on the upper side of the instrument panel through a face duct (not shown). From the face outlet toward the upper body side of the passenger in the passenger compartment (Mainly cold air) is blown out.

The face opening 25 and the foot opening 26 are switched and opened by a foot face switching door 27. The door 27 is composed of a flat plate-shaped door rotatable about a rotation shaft 27a.

Next, the foot opening 26 is provided in the air conditioning case 11
In, at the lower side of the face opening 25. The foot openings 26 communicate with foot outlet passages 28 opening on the left and right wall surfaces of the air conditioning case 11, and foot outlet ducts (not shown) formed downward in the left and right foot outlet passages 28. ) Is connected, and air conditioning air (mainly warm air) is blown to the foot of the occupant from a foot outlet (not shown) that opens at the lower end of the foot outlet duct.

The defroster door 23 and the foot face switching door 27 constitute a blowout mode door for switching the blowout mode, and are interlocked by a blowout mode operating mechanism (not shown).

Next, the operation of this embodiment having the above-mentioned structure will be described. When the blower of the blower unit (not shown) is operated, the blown air from the blower unit is transferred to the case 11
After flowing into the air inlet space 14 at the front of the
Pass through. Here, if an air conditioning refrigeration cycle (not shown) is operating, the blown air is cooled and dehumidified by the evaporator 12 to become cold air.

When the air mix door 16 is operated to the intermediate opening position shown by the broken line in FIG. 1, the evaporator 1
2 Part of the cool air after passing through the inlet ventilation passage 17 as indicated by arrow a.
Into which the cold air passes through the heat exchanging core portion 13a of the heater core 13 and is heated to become warm air. The warm air passes through the curved warm air passage 20 and reaches the air mixing unit 21. At the same time, the remainder of the cool air after passing through the evaporator 12 passes through the cool air bypass passage 15 as shown by the arrow b and reaches the air mixing section 21 as the cool air.

In the air mixing section 21, hot air and cold air are mixed to become air having a desired temperature, and the air having the desired temperature is selected by the defroster door 23 and the foot face switching door 27 to have a predetermined blowout opening 22. , 25, and 26 and blows out to a predetermined portion in the vehicle compartment.

By the way, a seal wall surface 18 defining the lower end portion of the opening range of the inlet ventilation passage 17 of the heater core 13 is provided at the upstream side of the heater core 13 in the air flow, that is, at the intermediate position between the evaporator 12 and the heater core 13. There is. The seal wall surface 18 has a shape that rises upward from the vicinity of the lower portion of the heater core 13.

Therefore, at the time of maximum heating, that is, when the air mix door 16 is operated to the position shown by the solid line in FIG. 1 and the inlet ventilation passage 17 is fully opened, the presence of the seal wall surface 18 causes the core portion for heat exchange of the heater core 13. Since the air flow to the lower region of 13a is obstructed, the relationship of wind velocity distribution above the heater core 13> wind velocity distribution below the heater core 13 occurs. Due to this, the heat exchange efficiency of the heater core 13 is reduced, and thus the maximum heating capacity is reduced.

Therefore, in the present embodiment, the air guide plate 19 is arranged in the inlet ventilation passage 17 of the heater core 13 so that the air flow in the inlet ventilation passage 18 is guided from the upper portion of the heater core 13 to the lower portion thereof. .

FIG. 3 (a) shows the air flow during maximum heating in this embodiment, and the main flow of air B after passing through the evaporator is the heat exchange core portion 13a of the heater core 13 due to the presence of the seal wall surface 18. However, the air near the left and right ends of the upper area is forcibly guided to the lower side of the heater core 13 by the air guide plates 19 on both the left and right sides in the upper area.

Here, the air above the air guide plates 19 on both the left and right sides passes through the space 19b as shown by the arrow B1 and flows to the upper side of the heat exchanging core portion 13a of the heater core 13, and the air on both the left and right sides. Air between the tip portions of the guide plate 19 passes through the gap 19a and flows to the upper side of the heat exchange core portion 13a of the heater core 13.

Due to the air guiding action to the lower side by the air guide plate 19 described above, the front wind velocity distribution of the heater core 13 can be made uniform even if the seal wall surface 18 exists. As a result, the heat exchange efficiency of the lower region of the heat exchange core portion 13a of the heater core 13 can be improved to the same level as that of the upper region, so that the maximum heating capacity of the heater core 13 can be improved.

FIG. 3 (b) shows the air flow during maximum heating of the conventional device. Due to the presence of the seal wall surface 18, the air flow B2 to the lower region of the heat exchange core portion 13a of the heater core 13 is restricted. Indicates that it has been done.

FIG. 4 shows the results of an experiment conducted by the present inventor, showing the ratio of the heater core 13 to the heating capacity of a single unit. That is, without incorporating the heater core 13 into the air conditioning case 11 of the air conditioning unit 10, the heater core 1
The heating capacity when air is blown to the heater core 13 in the state of 3 units is set to 100%, and the conventional device (air guide plate 19
And the present embodiment (having the air guide plate 19) respectively measure the heating capacity in a state where the heater core 13 is incorporated in the air conditioning unit 10, and the heating capacity of each heater core 13 is measured. It is expressed as a ratio to.

In the conventional apparatus which does not have the air guide plate 19, the heating capacity is reduced to around 90.3% of the unit performance due to the non-uniform wind speed on the front surface of the heater core. However, according to the present embodiment, the air guide plate 19 is used. Due to the uniform effect of the front wind speed distribution, the heating capacity can be increased to around 92.5% of the unit performance, and the heating capacity is 2% higher than that of conventional equipment.
% Can be improved.

The air guide plate 1 used in the experiment of FIG.
The protrusion amount W1 of No. 9 is 50 mm, and the other dimensions H1, H2, and H3 are NO. The numerical value of 4 is used. FIG. 5B shows each dimension H1, H2, H.
The part of 3 is illustrated.

It should be noted that in FIG. 1-3 and N
O. Also in the examined product of No. 5, the protrusion amount W1 of the air guide plate 19 is NO. As with No. 4, it is 50 mm. NO. Of FIG. 1-3 and NO. Even in the case of item 5 examined, the heating capacity can be improved by 1% to 2% over the conventional device.

By the way, the protrusion amount W1 of the air guide plate 19
Is set to be sufficiently smaller than the overall width W0 of the heater core 13 for the purpose of suppressing an increase in pressure loss and at the same time avoiding a problem due to the air guide plate 19 falling down during molding.

That is, the air guide plate 19 is formed integrally with the left and right resin split cases of the air conditioning case 11. However, if the air guide plate 19 is formed over the entire width W0 of the heater core 13, the air guide plate 19 is formed. 19 is the height H
With a comparatively small size of about 2 = 50 mm, the protrusion is elongated over a range of 1/2 of the full width W0.

As a result, since the left and right air guide plates 19 have a shape with low rigidity, the air guide plates 19 are likely to collapse due to molding distortion during molding of the left and right resin split cases. When this collapse occurs, when the left and right resin split cases are fastened, the left and right air guide plates 19 are displaced from each other, which makes it difficult to assemble the front ends together.

On the other hand, in this embodiment, the protrusion amount W1 of the air guide plate 19 is made smaller than the width dimension W2 of the gap 19a, and the protrusion amount W1 is made sufficiently smaller than the overall width dimension W of the heater core 13. Problems due to the air guide plate 19 falling down during molding can be avoided. Moreover, since the air flows into the space 19a between the tip portions of the left and right air guide plates 19, the increase in pressure loss due to the addition of the air guide plates 19 can be suppressed to a very small amount.

(Other Embodiments) In the above embodiment, the air conditioning unit 10 on the front seat side, which is arranged inside the vehicle instrument panel in the front part of the vehicle compartment, has been described. The present invention can be similarly implemented in the rear air conditioning unit arranged.

Although only one air guide plate 19 is arranged in the inlet air passage 17 of the heater core 13 in the above embodiment, a plurality of air guide plates 19 are arranged in the inlet air passage 17 of the heater core 13. You may.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an air conditioning unit portion of a vehicle air conditioner according to an embodiment of the present invention.

FIG. 2 is a view on arrow A in FIG.

FIG. 3A is a sectional view of a main part showing a heater core air flow during maximum heating according to an embodiment of the present invention, and FIG. 3B is a sectional view of a main part showing a heater core air flow during maximum heating according to a conventional technique. It is a figure.

FIG. 4 is a graph showing a heating capacity ratio of a heater core.

FIG. 5A is a table showing specific examples of various dimensions of the air guide plate according to the present invention, and FIG. 5B is a cross-sectional view of essential parts showing various-dimension portions of the air guide plate.

FIG. 6 is a cross-sectional view of an air conditioning unit portion of a vehicle air conditioner according to a conventional technique.

[Explanation of symbols]

11 ... Air conditioning case, 12 ... Evaporator (cooling heat exchanger),
13 ... Heater core (heating heat exchanger), 15 ... Cold air bypass passage, 16 ... Air mix door, 17 ... Heater core inlet ventilation passage, 18 ... Seal wall surface, 19 ... Air guide plate.

Claims (5)

[Claims] 1. An air conditioning case (11) forming a passage for air flowing toward a vehicle interior, and a heating heat exchanger (13) provided in the air conditioning case (11) for heating the air. A cold air bypass passage (15) provided in the air conditioning case (11) for bypassing the heating heat exchanger (13) and allowing cool air to flow; and provided in the air conditioning case (11) for the heating heat An air conditioner for a vehicle, comprising: an inlet air passage (17) of an exchanger (13); and an air mix door (16) for opening and closing the cold air bypass passage (15), wherein the heating heat exchanger (13) is the air conditioner. Case (11)
Inside the air conditioning case (1), the cold air bypass passage (15) is provided substantially vertically.
1) Inside the heat exchanger for heating (13), the air mix door (16) is provided near the upper part of the heat exchanger for heating (13) The rotating shaft (16a) Is rotatable around the air-flow upstream side of the heating heat exchanger (13),
A seal wall surface (18) that rises upward from near the lower portion of the heating heat exchanger (13) is provided, and the inlet air passage (17) is fully closed by the air mix door (16) to provide the cold air bypass passage. At the time of maximum cooling to fully open (15), the air mix door (16)
Of the air flow in the inlet air passage (17) from the upper part to the lower part of the heating heat exchanger (13). An air conditioner for a vehicle, wherein an air guide plate (19) for guiding is arranged in the inlet ventilation passage (17). 2. The air conditioning case (11) is made of resin, and the air guide plate (19) is the air conditioning case (1).
The vehicle air conditioner according to claim 1, wherein the vehicle air conditioner is integrally molded with (1). 3. The air guide plate (19) extends from the left and right ends of the heating heat exchanger (13) in the width direction to a predetermined amount inward in the width direction of the heating heat exchanger (13). W
1) It is arrange | positioned so that it may protrude, and the space | gap (19a) through which air passes is set between the front-end | tip parts of the air guide plate (19) of the said both right and left sides, The Claim 1 or 2 characterized by the above-mentioned. Air conditioning system for vehicles. 4. The vehicle air conditioner according to claim 3, wherein the gap (19a) has a size (W2) larger than a protrusion amount (W1) of the air guide plate (19). apparatus. 5. The air guide plate (19) is disposed in an upper side region of the heating heat exchanger (13) in the inlet ventilation passage (17), and the upper end portion of the air guide plate (19) and the air guide plate (19) are provided. A gap (19b) through which air passes is set between the air mix door (16) and the rotating shaft (16a), and the air guide plate (1
The vehicle air conditioner according to any one of claims 1 to 4, wherein the lower end of (9) is arranged near the center of the heating heat exchanger (13) in the vertical direction.