JPH09226349A - Air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a cool differential state at the time of a foot differential mode and a foot mode. SOLUTION: A defroster door 13 is stopped between a position to close a defroster communicating opening part 81 and a position slipped to the side of a defroster opening part 7 from the former position at the time of a foot differential mode and a foot mode. Thereafter, a clearance through which air flows is formed among an outer edge part of the defroster door 13, an inwall 81 of a defroster passage 8 and an outer edge part of the defroster communicating opening part 81. Consequently, as mixture of cool air in the defroster passage 8 is restrained and it becomes easy to introduce hot air in the defroster passage 8, it is possible to prevent a cool differential state at the time of the foot mode and the foot differential mode.

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 a vehicle, in which air conditioner devices are centrally arranged in a center console to reduce the size of the air conditioner.
It is effective when applied to a so-called (semi) center placement type.

[0002]

2. Description of the Related Art A center-mounted air conditioner is shown in FIG.
As shown in FIG. 3, the evaporator 2 and the heater core 3 are arranged in series in the vehicle front-rear direction, and the flow direction of the warm air after passing through the heater core 3 is bent approximately 90 ° toward the upper side of the vehicle, so that It is intended to be downsized in the front-rear direction. Therefore, the mainstream of the cool air and the mainstream of the hot air that bypass the heater core 3 are substantially above the heater core 3 in the vehicle.
At a relatively large angle of 0 °, they intersect and merge in the merge space 5.

On the downstream side of the merge space 5, there is a defroster flow path 8 extending from the merge space 5 to the defroster opening 7.
A face flow path 11 is formed from the confluence space 5 to the face opening 10 or the foot opening 9. The defrosted door 13 is used to switch and open both the face communication opening 51 that connects the face flow path 11 and the confluence space 5, and the defroster communication opening 81 that connects the defroster flow path 8 and the confluence space 5. The blowing mode to the passenger compartment is switched.

By the way, generally, in order to prevent the window glass from being fogged during the heating operation in winter, it is necessary to blow air toward the window glass. Therefore, a foot diff that blows air toward the feet of the occupant and the window glass. In the foot mode in which the air is blown only to the feet of the occupant as well as the mode, as shown in FIG. 6, the defroster door 13 stops at a predetermined position in the confluence space 5 and opens the defroster communication opening 81 to open the defroster flow path. Air was being introduced into 8.

However, if the mixed state of the cold air and the warm air is incomplete, more cold air will flow into the defroster flow path 8 than the warm air, and the temperature of the air blown out from the defroster air outlet during the heating operation in winter. Is so low that it makes passengers feel uncomfortable.
There has been a problem that the state becomes −DEF). As one of means for solving this cool diff condition, for example, in the Japanese Denso Public Technical Report (issued September 15, 1990, reference number 74-009), a notch 13A is provided at the substantially central portion of the end of the defroster door 13. It is proposed to provide (see FIG. 7) and guide the warm air into the defroster channel 8 from the cutout 13A.

[0006]

As described above, the defroster door 13 also serves as a door for switching between the face flow passage 11 and the defroster flow passage, so that the face flow passage 11 has a defroster door. A closed portion for closing the cutout 13A when the face flow channel 11 is closed by 13 is required.

Therefore, the closed portion is the face flow path 1
Since it becomes the resistance of the air flowing through 1, there is a new problem that a sufficient air volume cannot be obtained especially when the cool air is blown from the face outlet during the cooling operation. Therefore, the inventor tried the following consideration in order to suppress the occurrence of the cool differential state by investigating the mixed state of the cold air and the warm air in the mixing space in detail.

That is, since the warm air flows through the heater core 3 into the confluence space 5, the cold air flows through the evaporator 2 and bypasses the heater core 3 into the confluence space 5, so that the main flow of the warm air is The flow velocity becomes smaller than that of the mainstream of cold air. Furthermore, since the main stream of the warm air and the main stream of the cold air merge so as to intersect each other at a relatively large angle, the cold air having a high flow velocity becomes like an air curtain, and the hot air does not easily flow into the defroster flow path 8. As a result, a cool diff condition occurs.

The present invention has been made on the basis of the above-mentioned consideration of the inventor. Therefore, in a vehicle air conditioner in which a main stream of cold air having a high flow velocity and a main stream of warm air having a slower flow velocity than the cool air flow intersect with each other. The purpose is to prevent cool diff condition in foot diff mode and foot mode.

[0010]

The present invention uses the following technical means in order to achieve the above object. Claim 1
In the invention described in 3, the blowing mode setting means (44)
Thus, the defroster door (13) is positioned so as to close the defroster communication opening (81) when a mode in which a part of the air flowing in the air conditioning casing (1) is blown out from the defroster opening (7). , Stopping between the position and the position deviated to the defroster opening (7) side, the outer edge of the defroster door (13), the inner wall (81) of the defroster channel (8) and the defroster communication opening. A gap (13) through which air flows between the outer edge of (81)
2) is formed.

Due to the former feature, the main flow of cool air is less likely to enter the defroster flow path (8), and therefore excessive cool air is prevented from blowing out from the defroster opening (7). Further, the warm air deflected by the cold air having a high flow velocity flows along the inner wall of the defroster channel (8).
And according to the latter feature, in the present invention, since the gap (132) is formed between the inner wall of the defroster flow path (8) and the defroster door (13), the warm air has a gap (13).
It can flow to the defroster opening (7) via 2), and it becomes easy to introduce warm air into the defroster flow path (8).

Therefore, the cold air defroster channel (8)
Since it is easy to introduce hot air into the defroster flow channel (8) while suppressing the mixture into the defroster flow path (8), a mode is set in which a part of the air flowing in the air conditioning casing (1) is blown out from the defroster opening (7). It is possible to prevent the cool diff condition in the case of In the invention according to claim 2, the defroster door (13) is rotated about a branch point between the defroster flow channel (8) and the face flow channel (11) as a fulcrum to thereby connect the defroster opening (7) and the face communication. Both opening portions of the opening portion (51) are switched and opened and closed.

According to the third aspect of the invention, the gap (13
2) blows out a part of the air between the end of the defroster door (13) in the direction perpendicular to the mainstream direction of the cold air and the inner wall of the defroster flow path (8) from the defroster opening (7). It is possible to prevent the cool differential state when the mode is set. In the invention according to claim 2, the defroster door (13) is rotated about a branch point between the defroster flow channel (8) and the face flow channel (11) as a fulcrum to thereby connect the defroster opening (7) and the face communication. Both opening portions of the opening portion (51) are switched and opened and closed.

In the invention described in claim 3, the gap (13
2) is characterized in that it is formed between an end of the defroster door (13) in a direction perpendicular to the mainstream direction of the cool air and the inner wall of the defroster flow path (8). In addition, the code | symbol in the parenthesis of each said means shows the correspondence with the concrete means of embodiment mentioned later.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; (First Embodiment) FIG. 1 is a schematic view showing a ventilation system of a vehicle air conditioner according to the present embodiment. Reference numeral 1 is an air conditioning casing made of resin such as polypropylene. The air conditioning casing 1 is a blower not shown. It forms a flow path for air blown from. Hereinafter, the air conditioners of this vehicle air conditioner will be described in order from the air flow upstream side.

Reference numeral 2 denotes an evaporator for cooling the air flowing in the air-conditioning casing 1, which cools the air by evaporating the refrigerant flowing in the evaporator 2 as is well known. The evaporator 2 is an air blown by a blower. However, all of them are arranged in the air conditioning casing 1 so as to pass through the evaporator 2. Inside the air conditioning casing 1 on the air downstream side of the evaporator 2, a heater core 3 serving as a heating means for air is arranged, and this heater core 3 uses engine cooling water (not shown) as a heat source.

A bypass flow path 4 that bypasses the heater core 3 is formed in the air conditioning casing 1, and the bypass flow path 4 is formed in the air conditioning casing 1 on the vehicle upper side of the heater core 3. There is. Further, the bypass flow path 4 is formed so that the main flow direction of the cool air flowing through the bypass flow path 4 is directed to the upper rear side of the vehicle, and the ventilation surface 31 on the air downstream side of the heater core 3 is directed to the lower rear side of the vehicle.

As a result, the mainstream of the warm air that has passed through the heater core 3 toward the lower rear of the vehicle is deflected toward the upper rear of the vehicle, and then is deflected toward the upper front of the vehicle 32.
90 ° with the main flow of cold air from the bypass flow path 4
They intersect at an angle of and join at the merge space 5. Also,
On the upstream side of the heater core 3, an air mix door 6 that adjusts the temperature of the air blown into the vehicle compartment is arranged. The air mix door 6 bypasses the heater core 3 and cool air that flows into the bypass flow path 4, The air volume ratio with the air passing through the heater core 3 is adjusted, and the hot air and the cold air are mixed in the merging space 5 to adjust the temperature of the air.

On the downstream side of the confluence space 5, a defroster channel 8 reaching a defroster opening 7 communicating with a defroster outlet (not shown) for blowing air toward the vehicle window glass, and at the foot of the occupant. Foot opening 9 communicating with a foot outlet (not shown) that blows air toward
1, 92 and a face flow path 11 reaching a face opening 10 communicating with a face outlet (not shown) that blows air toward the upper half of the occupant.

Of these openings, the defroster opening 7
Is formed on a substantially extended line of the main flow direction of the warm air flowing from the warm air flow path 32 to the merging space 5 (upward direction toward the front of the vehicle), and the face opening portion 10 forms the cool air flowing from the bypass flow path to the merging space 5. It is formed on a substantially extended line in the mainstream direction (upward and rearward of the vehicle). Further, the foot openings 91 and 92 are formed on the foot channel 12 that branches from the face channel 11 toward the lower side of the vehicle. The foot opening 91 is a front seat opening, and the foot opening 92 is a rear seat opening.

Reference numeral 13 is a defroster door that opens and closes the defroster opening 7, and the face communication opening 51 that connects the merging space 5 and the face flow path 11. The defroster door 13 is a defroster flow path 8 and the face flow path. Road 1
The rectangular door body portion 131 of the defroster door 13 is rotated about the branch point with the defroster door 1 as a fulcrum to open the defroster opening 7
And the communication opening 51 are switched to open and close.

Air is provided between the outer edge portion of the defroster door 13, the outer edge portion of the defroster communication opening 81 for communicating the defroster channel 8 with the merging space 5, and the inner wall 81 of the defroster channel 8. A gap 132 that can flow is formed. As shown in FIG. 2, this gap 132 is an end of the defroster door 13 on the side perpendicular to the mainstream direction of the cool air blown into the mixing space 5 from the bypass passage 8. It is formed in the portion 13a. In the foot diff mode and the foot mode, as will be described later, air is blown out from the defroster opening 7 toward the window glass through the gap 132.

Reference numeral 14 is a face flow path 11 and a foot flow path 12
A foot communication opening 15 for communicating with the face opening 10 and a face door for opening and closing the face opening 10. The face door 14 allows the foot communication opening 15 and the face opening 1 to be communicated.
It switches between 0 and opens and closes. And each door 5, 1
3, 14 are driving means 40, 41, 4 such as a servomotor.
It is driven by 2 and each drive means 40, 41, 4
2 is controlled by a control unit (ECU) 43, as shown in FIG.

Further, a signal from a setting means 44 for setting the blowing mode is inputted to the control device 43, and the control device 43, based on the signal from the setting means 44, each drive means 40, 41, 42. Drive each door 5, 13, 1
4 is performed. Note that the balloon mode setting 44
Is a control device 43 based on a manual type manually set by an occupant, or a temperature setting means 45 for setting an indoor temperature desired by the occupant, and an air conditioning sensor group 46 such as an indoor temperature sensor, an outdoor temperature sensor, and a solar radiation sensor. Any of the auto type automatically set by.

Next, the operation in the foot mode and the foot differential mode will be described. 1. Foot Mode (See FIG. 4) When the foot mode is set by the blowing mode setting 44, the face opening 14 is closed by driving the face door 14 to rotate and the foot communication opening 1
Open 5. Then, the defroster door 13 stops at a position displaced from the position where the defroster communication opening 81 is closed to the defroster opening 7 side by a predetermined amount, that is, a position where the main flow of cold air is not introduced into the defroster flow path 8.

As a result, the main stream of the cool air and the main stream of the warm air are merged and mixed in the merge space 5, and most of the mixed air flows toward the main stream of the cool air, that is, toward the foot communication opening 15. Others flow through the gap 132 between the defroster door 13 and the inner wall of the defroster channel 8 and blow out from the defroster opening 7 toward the window glass. 2. Foot diff mode (see FIG. 5) When the foot mode is set by the blowing mode setting 44, the face opening 14 is closed by driving the face door 14 to rotate and the foot communication opening 1
Open 5. Then, the defroster door 13 stops at a position where the defroster communication opening 81 is closed (the position where the main flow of cold air and the defroster door 13 are substantially parallel to each other). At this time, the distance L (see FIG. 2) between the defroster door 13 and the defroster opening 7 is larger than that in the foot mode.

As a result, the main stream of the cool air and the main stream of the warm air are merged and mixed in the merge space 5, and most of the mixed air (less than in the foot mode) is in the direction of the main stream of the cool air having a high flow velocity, that is, the communication opening portion 15. Flow toward. Others (more than the foot mode) flow through the gap 132 between the defroster door 13 and the inner wall of the defroster channel 8 and blow out toward the window glass from the defroster opening 7.

Next, the features of the present invention will be described. According to the present embodiment, when the foot mode or the foot differential mode is set by the blowing mode setting 44, the position where the defroster door 13 closes the defroster communication opening 81 and the defroster opening 7 side from that position. By stopping between the displaced position, the door body 131 and the mainstream of the cool air do not directly intersect with each other. As a result, the main flow of cool air is less likely to enter the defroster flow path 8, and excessive cool air is prevented from blowing out from the defroster opening 7.

Further, as shown in FIG. 2, the warm air deflected by the cool air having a high flow velocity in the direction perpendicular to the main flow direction of the cool air flows along the inner wall of the defroster channel 8. Further, since the gap 132 is formed between the inner wall of the defroster flow path 8 and the defroster door 13, the warm air flows in the gap 13.
2 can flow to the defroster opening 7, and the hot air can be easily introduced into the defroster flow path 8.

Therefore, since the cold air is prevented from mixing into the defroster channel 8 and the hot air is easily introduced into the defroster channel 8, it is possible to prevent the cool differential state in the foot mode and the foot differential mode. . Further, according to the present embodiment, as described in the section of the related art, the blockage for closing the cutout portion in the face flow channel 11 as in the case where the cutout portion is provided in the door body portion of the defroster door. Since it is not necessary to provide a site, it is possible to prevent an increase in ventilation resistance of the face flow channel 11. Therefore,
It is possible to prevent the cool differential state while preventing a decrease in the amount of blown air when the cool air is blown from the face opening 10 during the cooling operation.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an air conditioner according to the present invention.

FIG. 2 is a view taken in the direction of arrow A in FIG. 1;

FIG. 3 is a schematic diagram of a control system of the present invention.

FIG. 4 is an explanatory diagram showing a position of a defroster door in a foot mode.

FIG. 5 is an explanatory diagram showing the position of the defroster door in the foot differential mode.

FIG. 6 is a schematic diagram of an air conditioner according to a conventional technique.

FIG. 7 is a perspective view of a conventional defroster door.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Air-conditioning casing, 2 ... Evaporator, 3 ... Heater core, 4 ... Bypass channel, 5 ... Mixing space, 6 ... Air mix door, 7 ... Defroster opening, 8 ... Defroster channel,
10 ... Face opening part, 11 ... Face flow path, 12 ... Foot flow path, 13 ... Defroster door, 14 ... Face door.

Claims (3)

[Claims] 1. An air conditioning casing (1) forming an air flow path, and heating means (3) arranged in the air conditioning casing (1) for heating air flowing in the air conditioning casing (1).
A bypass flow path (4) formed in the air conditioning casing (1) and bypassing the heating means (3); a main flow of warm air heated by the heating means (3); and a bypass flow. A converging space (5) where the mainstream of the cool air that has passed through the passage (4) intersects at a predetermined angle and merges, and a converging space (5) is formed on the downstream side in the mainstream direction of the warm air, and is formed on a vehicle window glass. A defroster opening (7) communicating with a defroster outlet that blows air toward the defroster opening (7), a defroster flow path (8) from the merge space (5) to the defroster opening (7), and the defroster opening (7) A defroster door (13) having a rectangular shape for opening and closing, a defroster communication opening (81) for communicating the defroster flow path (8) with the confluence space (5), and an air blowing mode into the vehicle interior are provided. Callout mode to set When the mode setting means (44) and the blowing mode setting means (44) set a mode in which a part of the air flowing in the air conditioning casing (1) is blown out from the defroster opening (7), Control means (40, 43) for stopping the defroster door (13) between a position where the defroster communication opening (81) is closed and a position displaced from the position to the defroster opening (7) side. And a gap (132) through which air flows between the outer edge of the defroster door (13) and the inner wall (81) of the defroster channel (8) and the outer edge of the defroster communication opening (81). ) Is formed. 2. A face opening (1) which is formed on the downstream side of the confluence space (5) in the mainstream direction of the cold air and communicates with a face outlet for blowing air toward the upper half of the occupant.
0), a face flow channel (11) branched from the defroster flow channel (8) to reach the face opening (10) from the merge space (5), the merge space (5) and the face flow channel. A face communication opening (51) communicating with (11) is provided, and the defroster door (13) rotates about a branch portion between the defroster flow channel (8) and the face flow channel (11) as a fulcrum. The vehicle air conditioner according to claim 1, wherein the defroster opening (7) and the face communication opening (51) are opened and closed by switching. 3. The gap (132) is formed between an end of the defroster door (13) in a direction perpendicular to the mainstream flow direction of the cold air and an inner wall of the defroster channel (8). The vehicle air conditioner according to claim 1 or 2, characterized in that: