JP3658836B2 - Air conditioner for vehicles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air conditioner for a vehicle, and is effective when applied to a so-called (semi) center-placed type in which air conditioners are reduced in size by concentrating and arranging air conditioner equipment in a center console section. .
[0002]
[Prior art]
For example, as shown in FIG. 6, the center-placement type air conditioner has an evaporator 2 and a heater core 3 arranged in series in the vehicle front-rear direction, and the hot air flow direction after passing through the heater core 3 is directed upward of the vehicle. By bending approximately 90 °, the air conditioner is reduced in size in the longitudinal direction of the vehicle. For this reason, the main flow of cold air and the main flow of hot air that bypass the heater core 3 intersect and mix in the merge space 5 at a relatively large angle of approximately 90 ° above the heater core 3 in the vehicle.
[0003]
Further, a defroster flow path 8 extending from the merge space 5 to the defroster opening 7 and a face flow path 11 extending from the merge space 5 to the face opening 10 or the foot opening 9 are formed on the downstream side of the merge space 5. ing. Then, switching off both the openings of the face flow passage 11 and the converging space 5 and the face communicating opening 51, and the defroster channel 8 and converging space 5 defroster communicating opening 81 for communicating communicating by Defurosu data door 13 Thus, the mode for blowing into the passenger compartment is switched.
[0004]
By the way, in general, in order to prevent fogging of the window glass during the winter heating operation, it is necessary to blow air toward the window glass, so of course the foot differential mode which blows air toward the passenger's feet and the window glass is of course Even in the foot mode in which air is blown only to the occupant's feet, the defroster door 13 stops at a predetermined position in the merging space 5 and opens the defroster communication opening 81 as shown in FIG. Was introduced.
[0005]
However, if the mixed state of cold air and hot air is incomplete, more cold air flows into the defroster flow path 8 than the hot air, and the temperature of the air blown out from the defroster outlet during the winter heating operation is excessive. There has been a problem of a so-called cool-def (COOL-DEF) state that becomes low and gives passengers discomfort.
As one of the means for solving this cool differential state, for example, in Nippon Denso public technical report (September 15, 1990 issue reference number 74-009), a notch portion 13A is provided at a substantially central portion of the end portion of the defroster door 13. It has been proposed (see FIG. 7) to guide the warm air from the notch 13A into the defroster flow path 8.
[0006]
[Problems to be solved by the invention]
By the way, as described above, the defroster door 13 also serves as a switching opening / closing door between the face channel 11 and the defroster channel. Therefore, the face channel 11 is closed to the face channel 11 by the defroster door 13. At this time, a closed portion for closing the cutout portion 13A is required.
[0007]
For this reason, since the said obstruction | occlusion site | part becomes resistance of the air which flows through the face flow path 11, the new problem that sufficient air volume cannot be obtained especially at the time of blowing off cold air from a face blower outlet generate | occur | produced at the time of air_conditionaing | 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 hot air in the mixing space in detail.
[0008]
That is, the warm air passes through the heater core 3 and flows into the merge space 5, while the cool air passes through the evaporator 2 and then bypasses the heater core 3 and flows into the merge space 5. Compared to, the flow velocity will be smaller. Further, since the main flow of the hot air and the main flow of the cold air merge so as to intersect at a relatively large angle, the cold air having a large flow velocity becomes like an air curtain, and the hot air is difficult to flow into the defroster flow path 8. As a result, a cool differential state occurs.
[0009]
The present invention is based on the above inventor's consideration, and therefore, in a vehicle air conditioner where a main flow of cold air having a high flow velocity intersects with a main flow of hot air having a low flow velocity compared to the cold air, The purpose is to prevent the cool differential state in the mode and foot mode.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the present invention uses the following technical means. In the first and second aspects of the present invention, when the blowing mode setting means (44) is set to a mode in which a part of the air flowing in the air conditioning casing (1) is blown out from the defroster opening (7), the defroster is set. Stopping the door (13) between a position where the defroster communication opening (81) is closed and a position shifted from the position toward the defroster opening (7), and an outer edge of the defroster door (13) And a gap (132) through which air flows are formed between the inner wall (81) of the defroster flow path (8) and the outer edge of the defroster communication opening (81) . The gap (132) is a defroster door. (13) It is characterized by two being formed between the end of the direction perpendicular to the main flow direction of the cold air and the inner wall of the defroster flow path (8) .
[0011]
Due to the former feature, the main flow of cold air is less likely to be mixed into the defroster flow path (8), so that excessive cold air is prevented from blowing out from the defroster opening (7).
Moreover, the warm air deflected by the cold air having a high flow velocity flows along the inner wall of the defroster channel (8). According to the latter feature, the present invention has a gap (132) formed between the inner wall of the defroster flow path (8) and the defroster door (13), so that the hot air passes through the gap (132). It can flow into the defroster opening (7), and it becomes easy to introduce warm air into the defroster flow path (8).
[0012]
Accordingly, mixing of cold air into the defroster flow path (8) is suppressed, and warm air can be easily introduced into the defroster flow path (8), so that part of the air flowing in the air conditioning casing (1) is opened in the defroster opening. It is possible to prevent the cool differential state when the mode is set to blow out from the part (7).
In the second aspect of the invention, the defroster door (13) rotates around the branch portion of the defroster flow path (8) and the face flow path (11) as a fulcrum, so that the defroster opening (7) and the face communication are provided. It is characterized in that both openings of the opening (51) are switched open and closed.
[0014]
Contact name code in parentheses above means show the correspondence with specific means described embodiments to be described later.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention shown in the drawings will be described.
(First embodiment)
FIG. 1 is a schematic diagram showing a ventilation system of a vehicle air conditioner according to the present embodiment. Reference numeral 1 denotes an air conditioning casing made of resin such as polypropylene, and the air conditioning casing 1 is an air blower from a blower not shown. A flow path is formed. Hereinafter, the air conditioner of this vehicle air conditioner will be described in order from the upstream side of the air flow.
[0016]
An evaporator 2 cools the air flowing in the air conditioning casing 1 and cools the air by evaporating the refrigerant flowing in the evaporator 2 as is well known, and the evaporator 2 has all the air blown from the blower. It arrange | positions in the air-conditioning casing 1 so that the evaporator 2 may be passed. In the air conditioning casing 1 on the air downstream side of the evaporator 2, a heater core 3 serving as air heating means is disposed, and the heater core 3 uses engine cooling water (not shown) as a heat source.
[0017]
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. Further, the bypass flow path 4 is formed so that the main flow direction of the cold air flowing through the bypass flow path 4 is directed to the rear side above the vehicle, and the ventilation surface 31 on the downstream side of the heater core 3 is directed to the lower rear side of the vehicle.
[0018]
As a result, the main flow of the warm air that has passed through the heater core 3 toward the rear lower side of the vehicle is deflected toward the upper rear of the vehicle, and then flows through the warm air flow path 32 that is deflected toward the upper front of the vehicle. It intersects with the main stream of the cold wind from the path 4 at an angle of about 90 ° and merges in the merge space 5.
Further, an air mix door 6 for adjusting the temperature of the air blown into the passenger compartment is disposed on the upstream side of the heater core 3, and the air mix door 6 bypasses the heater core 3 and flows into the bypass flow path 4. The air volume ratio with the air passing through the heater core 3 is adjusted, and the temperature of the air is adjusted by mixing the hot air and the cold air in the merge space 5.
[0019]
Further, on the downstream side of the air in the merging space 5, a defroster flow path 8 leading to a defroster opening 7 communicating with a defroster outlet (not shown) that blows air toward the vehicle window glass, and air toward the feet of the occupant And a face channel 11 leading to a face opening 10 communicating with a face outlet (not shown) that blows air toward the upper body of the occupant. Is formed.
[0020]
Among these openings, the defroster opening 7 is formed on a substantially extended line in the main flow direction (upward direction in front of the vehicle) of hot air from the hot air flow path 32 toward the merge space 5, and the face opening 10 is bypassed. It is formed on a substantially extended line in the main flow direction (upward direction in the rear of the vehicle) of the cold air from the flow path toward the merge space 5. Further, the foot openings 91 and 92 are formed on the foot channel 12 branched from the face channel 11 toward the vehicle lower side. The foot opening 91 is a front seat opening, and the foot opening 92 is a rear seat opening.
[0021]
Reference numeral 13 denotes a defroster door that opens and closes the defroster opening 7 and the face communication opening 51 that connects the merge space 5 and the face channel 11. The defroster door 13 includes the defroster channel 8 and the face channel 11. The rectangular door main body 131 of the defroster door 13 is rotated with the branch portion as a fulcrum to switch between the defroster opening 7 and the communication opening 51 to open and close.
[0022]
Air can flow between the outer edge portion of the defroster door 13, the outer edge portion of the defroster communication opening 81 that connects the defroster flow path 8 and the merge space 5, and the inner wall 81 of the defroster flow path 8. A gap 132 is formed. As shown in FIG. 2, the gap 132 is formed in the end portion 13 a of the defroster door 13 on the side perpendicular to the main flow direction of the cold air blown from the bypass flow path 4 to the mixing space 5. Has been. In the foot differential mode and the foot mode, air is blown out from the defroster opening 7 toward the window glass through the gap 132 as will be described later.
[0023]
Reference numeral 14 denotes a foot communication opening 15 that allows the face channel 11 and the foot channel 12 to communicate with each other, and a face door that opens and closes the face opening 10. The face door 14 connects the foot communication opening 15 and the face opening 10. Switching open and close. The doors 5, 13, and 14 are driven by driving means 40, 41, and 42 such as servo motors. The driving means 40, 41, and 42 are controlled by a control unit (ECU) as shown in FIG. 43.
[0024]
Further, the control device 43 receives a signal from the setting means 44 for setting the blowing mode, and the control device 43 drives each driving means 40, 41, 42 based on the signal from the setting means 44. The doors 5, 13, and 14 are controlled to open and close. The blowing mode setting 44 is a manual type manually set by the occupant, or temperature setting means 45 for setting the indoor temperature desired by the occupant, and an air conditioning sensor group such as an indoor temperature sensor, an outdoor temperature sensor, and a solar radiation sensor. 46, any of the automatic types automatically set by the control device 43 may be used.
[0025]
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 door 14 is rotated to close the face opening 10 and open the foot communication opening 15. The defroster door 13 stops at a position shifted from the position at which the defroster communication opening 81 is closed to the defroster opening 7 side by a predetermined amount, that is, at a position where the main flow of cold air is not introduced into the defroster flow path 8.
[0026]
As a result, the main flow of the cold air and the main flow of the hot air are merged and mixed in the merge space 5, and most of the mixed air flows toward the main flow direction of the cold 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 flow path 8 and blow out from the defroster opening 7 toward the window glass.
2. Foot differential mode (see Fig. 5)
When the foot mode is set by the blowing mode setting 44, the face door 14 is rotated to close the face opening 10 and open the foot communication opening 15. The defroster door 13 stops at a position where the defroster communication opening 81 is closed (a position where the main flow of cold air and the defroster door 13 are in a substantially parallel state). 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.
[0027]
Thereby, the main flow of the cold air and the main flow of the hot air are merged and mixed in the merge space 5, and most of the mixed air (less than the foot mode) is directed toward the main flow direction of the cold air having a high flow velocity, that is, toward the communication opening 15. It flows. Others (more than the foot mode) flow through the gap 132 between the defroster door 13 and the inner wall of the defroster flow path 8 and blow out from the defroster opening 7 toward the window glass.
[0028]
Next, 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 blow mode setting 44, the defroster door 13 closes to the defroster communication opening 81, and from that position to the defroster opening 7 side. By stopping between the shifted positions, the door main body 131 and the main flow of the cold air do not directly intersect. Thereby, the main flow of the cold air is less likely to be mixed into the defroster flow path 8, so that excessive cold air is prevented from blowing out from the defroster opening 7.
[0029]
In addition, as shown in FIG. 2, the warm air deflected in the direction perpendicular to the main flow direction of the cool air by the cool air having a high flow velocity flows along the inner wall of the defroster flow path 8. Since the gap 132 is formed between the inner wall of the defroster flow path 8 and the defroster door 13, the hot air can flow to the defroster opening 7 through the gap 132, and the hot air can flow into the defroster flow path 8. It becomes easy to introduce.
[0030]
Therefore, mixing of cool air into the defroster flow path 8 is suppressed, and warm air can be easily introduced into the defroster flow path 8, so that a cool differential state in the foot mode and the foot differential mode can be prevented. Further, according to this embodiment, as described in the section of the prior art, as in the case of providing the cutout portion in the door main body portion of the defroster door, closed for closing the notch in the face flow passage 11 Since it is not necessary to provide a site, an increase in ventilation resistance of the face channel 11 can be prevented. 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 out from the face opening 10 during the cooling operation.
[Brief description of the 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.
FIG. 3 is a schematic diagram of a control system of the present invention.
FIG. 4 is an explanatory diagram showing the position of the defroster door in the 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]
1 ... Air conditioning casing, 2 ... Evaporator, 3 ... Heater core,
4 ... Bypass channel, 5 ... Mixing space, 6 ... Air mix door,
7: Defroster opening, 8 ... Defroster flow path, 10 ... Face opening,
11 ... Face channel, 12 ... Foot channel, 13 ... Defroster door,
14 ... Face door.

Claims (2)

An air conditioning casing (1) forming an air flow path;
Heating means (3) disposed in the air conditioning casing (1) and heating air flowing in the air conditioning casing (1);
A bypass channel (4) formed in the air conditioning casing (1) and bypassing the heating means (3);
A confluence space (5) in which the main flow of hot air heated by the heating means (3) and the main flow of cold air that has passed through the bypass flow path (4) intersect at a predetermined angle;
A defroster opening (7) that is formed downstream of the merging space (5) in the mainstream direction of the warm air and communicates with a defroster outlet that blows air toward the vehicle window glass;
A defroster flow path (8) from the merge space (5) to the defroster opening (7);
A rectangular defroster door (13) for opening and closing the defroster opening (7);
A defroster communication opening (81) for communicating the defroster flow path (8) and the merge space (5);
A blowing mode setting means (44) for setting a blowing mode of air into the passenger compartment;
When the blowing mode setting means (44) is set to a mode in which a part of the air flowing through the air conditioning casing (1) is blown out from the defroster opening (7), the defroster door (13) is connected to the defroster. Control means (40, 43) for stopping between a position for closing the opening (81) and a position shifted from the position to the defroster opening (7) side;
A gap (132) through which air flows is formed between the outer edge of the defroster door (13) and the inner wall (81) of the defroster flow path (8) and the outer edge of the defroster communication opening (81). The gap (132) is formed between the end of the defroster door (13) in a direction perpendicular to the main flow direction of the cold air and the inner wall of the defroster flow path (8) . A vehicle air conditioner characterized by the above. A face opening (10) that is formed on the downstream side in the main flow direction of the cold air from the merging space (5) and communicates with a face outlet that blows out air toward the upper body of the occupant;
A face channel (11) that branches off from the defroster channel (8) and extends from the merge space (5) to the face opening (10);
A face communication opening (51) for communicating the merge space (5) and the face channel (11);
The defroster door (13) rotates about a branch portion of the defroster flow path (8) and the face flow path (11) as a fulcrum, so that the defroster opening (7) and the face communication opening (51) The vehicle air conditioner according to claim 1, wherein the two openings are switched to open and close.

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