JP4985604B2 - Air conditioner for vehicles - Google Patents

Description

  The present invention relates to a vehicle air conditioner capable of suppressing the occurrence of a cool defroster state in a foot defroster mode and a hot defroster state in a foot mode.

  In an air conditioning unit of a vehicle air conditioner, an air conditioning unit that is arranged at a substantially central portion in the left-right direction of the vehicle out of the inner part of the instrument panel in front of the vehicle interior, Corresponding to the arrangement, there is a defroster opening near the cold air passage. For this reason, it is difficult to guide the warm air to the opening portion of the defroster, and there is a problem that it becomes a cool defroster in the foot defroster mode.

  As one of conventional techniques for solving this cool defroster, there is a technique disclosed in Patent Document 1 below. This is formed by forming a cold air bypass passage above the heating heat exchanger, a hot air passage below the cold air bypass passage, the defroster opening above the cold air bypass passage, and the foot opening at the defroster opening. Rather than the warm air passage. A tunnel-like frame is arranged in the cold-air bypass passage in the vertical direction, and a hot-air bypass passage is formed inside the tunnel-like frame to guide the warm air from the warm-air passage toward the defroster opening. is there.

Further, in Patent Document 2 below, in order to set an appropriate upper and lower blowing temperature difference in both the bi-level mode and the foot defroster mode, hot air and cold air in the air mixing unit are arranged on the rotation shaft of the blowing mode door. When the movable guide member that adjusts the mixing degree is integrally connected and the blowout mode door is operated to the bi-level mode position, the movable guide member moves to a rotational position that lowers the mixing degree of the hot air and the cold air. Widen the difference between the upper and lower blowout temperatures. On the other hand, when the blowing mode door is operated to the foot defroster mode position, the movable guide member is moved to the rotation position to increase the mixing degree of the hot air and the cold air, and the difference between the upper and lower blowing temperature is described. Yes.
JP 2004-338613 A JP 2004-345377 A

  However, in the former prior art described above, when the passage area of the tunnel frame (warm air bypass passage) is designed in the foot defroster mode where the cool defroster is most prominent, the foot mode has a defroster opening compared to the foot defroster mode. Since the opening of the portion is small, the pressure near the opening of the defroster is increased by the warm air guided by the tunnel-like frame body in the foot mode, and the ratio of the warm air increases because the cold air cannot flow. This creates a new problem of becoming a hot defroster in the foot mode.

  The present invention has been made paying attention to such problems existing in the prior art, and its purpose is to suppress the occurrence of both the cool defroster state in the foot defroster mode and the hot defroster state in the foot mode. An object of the present invention is to provide a vehicle air conditioner that can be used.

In order to achieve the above object, the present invention employs the following technical means. That is, in the first aspect of the present invention, the air conditioning case (11) that forms an air passage for the air toward the vehicle interior, and the heating heat exchanger (13) that is disposed in the air conditioning case (11) and heats the air. ), A cold air bypass passage (15) that is formed above the heating heat exchanger (13) in the air conditioning case (11), and bypasses the heating heat exchanger (13) and flows cool air, and an air conditioning case (11) formed in the lower side of the cold air bypass passage (15) and disposed in the air conditioning case (11) and the hot air passage (18) through which the hot air passing through the heating heat exchanger (13) flows. An air mix door (16) that adjusts the ratio of the amount of air that passes through the heat exchanger for heating (13) and becomes hot air and the amount of cold air that passes through the cold air bypass passage (15), and a cold air bypass passage (15 ) Located on the upper side of the Air mixed with hot air and cold air, provided at the downstream end of the air passage in the defroster opening (20) and the air conditioning case (11) for blowing air mixed with the cold air to the window glass side in the vehicle interior The face opening (22) that blows out the air to the passenger's upper body side in the passenger compartment and the warm air passage (18) closer to the warm air passage (18) than the defroster opening (20) A part of the warm air that passes through the foot opening (24) that blows out to the passenger's feet in the room and the cold air bypass passage (15) so as to be substantially orthogonal and flows out of the hot air passage (18) is opened in the defroster. A vehicle air conditioner comprising a tunnel-like frame (26) that forms a warm air bypass passage (27) leading to the section (20) side,
A protruding plate part (254) is provided in a part of the foot door means (25A to 25D) for opening and closing the foot opening part (24), and the foot door means (25A to 25D) is movable to the side of fully opening the foot opening part (24). Sometimes, the protruding plate portion (254) is inserted into the hot air bypass passage (27) to reduce the passage area of the hot air bypass passage (27).

  In the present invention, the hot air guided by the warm air bypass passage (27) formed by the tunnel-like frame (26) increases the pressure in the vicinity of the defroster opening (20) in the foot mode to become a hot defroster. It pays attention to the point. That is, when the foot door means (25A to 25D) is moved to the side that fully opens the foot opening (24) in the foot mode, the hot air bypass is performed using the protruding plate part (254) provided on the foot door means (25A to 25D). The passage area of the passage (27) is reduced.

  According to the first aspect of the present invention, in the foot mode, the passage area of the hot air bypass passage (27) is reduced, and the cold air flows by not increasing the pressure near the defroster opening (20). It can suppress becoming a hot defroster. Further, in the foot defroster mode, which is the idea for forming the warm air bypass passage (27) in the tunnel frame (26), the defroster opening (20) and the foot opening (24) are substantially half-opened. .

  For this reason, the protruding plate part (254) provided in the foot door means (25A to 25D) does not reduce the passage area of the hot air bypass passage (27), and the defroster opening (20) in the hot air bypass passage (27). It can suppress becoming a cool defroster by the warm air led to near. That is, the cool defroster state in the foot defroster mode and the hot defroster state in the foot mode are configured by restricting the amount of hot air passing through the warm air bypass passage (27) in correspondence with the fully opening of the foot door means (25A to 25D). And the occurrence of both can be suppressed.

  According to a second aspect of the present invention, in the vehicle air conditioner according to the first aspect, the face opening (22) is fully closed, the foot opening (24) is fully open, and the defroster opening (20). In the foot mode in which the mixed air is blown out at a predetermined opening, the protruding plate portion (254) reduces the passage area of the hot air bypass passage (27), and in the other blowing modes, the protruding plate portion (254) is warm. The passage area of the wind bypass passage (27) is not reduced.

  The present invention focuses on the fact that the foot door means (25A to 25D) are in a position to fully open the foot opening (24) only in the foot mode. According to the second aspect of the present invention, the passage area of the hot air bypass passage (27) can be reduced only in the foot mode where the hot defroster is a problem in the configuration of the present invention, and the foot opening ( In the foot defroster mode and bilevel mode in which the opening degree is 24), and in the face mode and defroster mode in which the foot opening (24) is fully closed, the passage area of the hot air bypass passage (27) is not reduced. It does not affect other blowing modes other than the foot mode.

  Moreover, in invention of Claim 3, in the vehicle air conditioner of Claim 1 or 2, a protrusion board part (254) is integrally formed in the board | substrate part (252) of a foot door means (25A-25D). It is characterized by being. According to the third aspect of the present invention, when the base plate portion (252) of the foot door means (25A to 25D) is formed, the protruding plate portion (254) is integrally formed, thereby suppressing the cost. A configuration can be formed.

  According to a fourth aspect of the present invention, in the vehicle air conditioner according to any one of the first to third aspects, the pivot shaft (251) is disposed on one side surface of the substrate portion (252) as the foot door means. A cantilevered shaft rotation type door (25A) is used. According to the fourth aspect of the present invention, a cantilevered pivoting door (25A) can be used as the foot door means.

  According to a fifth aspect of the present invention, in the vehicle air conditioner according to any one of the first to third aspects, the pivot shaft (251) is arranged at a substantially central side of the substrate portion (252) as the foot door means. The butterfly type pivoting door (25B) is used. According to the fifth aspect of the present invention, a butterfly-type pivoting door (25B) can be used as the foot door means.

  According to a sixth aspect of the present invention, in the vehicle air conditioner according to any of the first to third aspects, the foot door means is slid in a substantially planar direction of the substrate portion (252) to open and close the opening. The surface slide type door (25C) to perform is used. According to the sixth aspect of the present invention, it is possible to use the surface sliding type door (25C) as the foot door means.

  According to a seventh aspect of the present invention, in the vehicle air conditioner according to any one of the first to third aspects, as the foot door means, the substrate portion (252) is arranged in one outer circumferential direction with respect to the rotating shaft (251). A shaft-sliding surface sliding door (25D) having a flat surface in the direction of the rotation axis is used. According to the seventh aspect of the invention, more specifically, it can be configured by using a pivoting surface sliding door (25D).

  Moreover, in invention of Claim 8, in the vehicle air conditioner in any one of Claim 4,5,7, a rotating shaft (251) is a vehicle back side wall surface of a tunnel-shaped frame (26). It is characterized by the fact that it is adjacent to the rear side. According to the eighth aspect of the present invention, when the foot door means (25A, 25B, 25D) is rotated to the side that fully opens the foot opening (24), the protruding plate portion (254) protruded in the rotating direction. ) Can be inserted into the hot air bypass passage (27), and the passage area of the hot air bypass passage (27) can be reduced.

  Further, in the invention according to claim 9, in the vehicle air conditioner according to any one of claims 4 to 6, the foot opening (24) is opened substantially downward. . According to the ninth aspect of the present invention, the cantilevered pivoting door (25A), the butterfly pivoting door (25B), or the surface sliding door (25C) is used as the foot door means. In this case, the structure of the present invention can be formed by opening the foot opening (24) substantially downward.

  Further, the invention according to claim 10 is characterized in that, in the vehicle air conditioner according to claim 7, the foot opening (24) is opened in the left-right direction of the vehicle. According to the tenth aspect of the present invention, when the pivoting surface sliding door (25D) is used as the foot door means, by opening the foot opening (24) in the left-right direction of the vehicle, The configuration of the present invention can be formed. In addition, the code | symbol in the parenthesis as described in a claim and said each means is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1 is a schematic longitudinal sectional view of an air conditioning unit 10 according to a first embodiment of the present invention, showing a foot mode state. The ventilation system of the vehicle air conditioner of the present embodiment is roughly divided into two parts, a blower unit (not shown) and an air conditioning unit 10 shown in FIG.

  The blower unit is disposed so as to be offset from the center portion to the passenger seat side in the inner part of the instrument panel in front of the vehicle interior. On the other hand, the air conditioning unit 10 is disposed at a substantially central portion in the left-right direction of the vehicle in the inner part of the instrument panel in front of the vehicle interior.

  As is well known, the blower unit is composed of an inside / outside air switching box for switching between the inside air (vehicle interior air) and the outside air (vehicle outside air) and a blower for sucking air through the inside / outside air switching box. Yes. This blower rotates a known centrifugal multiblade fan (sirocco fan) with an electric motor.

  The air conditioning unit 10 constitutes an air passage to the passenger compartment on the downstream side of the air from the blower unit. In this example, two air conditioning cases 11 are provided with evaporators (refrigerant evaporator, cooling heat exchanger) of the refrigeration cycle. ) 12 and the heater core (heating heat exchanger referred to in the present invention) 13 are both of a type that integrally accommodates.

  The two air conditioning cases 11 are made of a resin molded product having a certain degree of elasticity and excellent strength, such as polypropylene, and is composed of two vertically divided case members that are divided in the vehicle left-right direction. ing. That is, the two air conditioning cases 11 are composed of a right case located on the right side of the vehicle and a left case located on the left side of the vehicle.

  In addition, the cross section of the air-conditioning case 11 shown in FIG. 1 represents the cross section of the split surface vicinity of two cases. These two air-conditioning cases include the above-described heat exchangers 12 and 13 and devices such as doors 16, 21, 23, and 25 and a tunnel-like frame 26 described later, and then metal spring clips and screws (not shown). The air conditioning unit 10 is configured to be integrally coupled by the fastening means.

  The air conditioning unit 10 is arranged in the form shown in FIG. 1 with respect to the front and rear and up and down directions of the vehicle at the front part in the vehicle interior, and the air inlet 14 is formed at the most front part of the air conditioning case 11. Has been. This air inflow port 14 is open to the side surface of the air conditioning case 11 on the passenger seat side in order to connect to the air outlet portion of the above-described blower unit disposed in the front portion of the passenger seat.

  The present embodiment shows an example applied to a right-hand drive vehicle, and air-conditioning air blown from a blower unit disposed on the left side of the vehicle from the air-conditioning unit 10 flows into the air inlet 14. In the air conditioning case 11, the above-described evaporator 12 is disposed immediately after the air inlet 14.

  The evaporator 12 has a thin shape in the vehicle front-rear direction and is arranged in the vertical direction so as to cross the passage in the air conditioning case 11. Further, the evaporator 12 is disposed on the front side in the air conditioning case 11. Then, blown air from the air inlet 14 flows into the front surface of the evaporator 12 extending in the vehicle vertical direction.

  The evaporator 12 is, for example, a well-known laminated type, and is formed by laminating a large number of corrugated fins between flat tubes formed by laminating two metal thin plates such as aluminum and brazing them integrally. . As is well known, the evaporator 12 constitutes a cooling heat exchanger that absorbs the latent heat of vaporization of the refrigerant in the refrigeration cycle from the air-conditioning air and cools the air-conditioning air passing therethrough.

  And the heater core 13 is arrange | positioned at predetermined intervals on the air flow downstream side (vehicle rear side) of the evaporator 12. The heater core 13 reheats the cold air that has passed through the evaporator 12, and high-temperature hot water (engine cooling water) flows through the heater core 13. The heater core 13 constitutes a heating heat exchanger that heats air using the hot water as a heat source. Is.

  In the present embodiment, the heater core 13 is disposed to be inclined toward the vehicle rear side on the lower side of the substantially central portion in the air conditioning case 11. This heater core 13 is a well-known one. For example, a large number of laminated thin tubes with corrugated fins interposed between flat tubes formed by joining thin metal plates such as aluminum in a flat shape by welding or the like, and brazed integrally. It is.

  In the air passage in the air conditioning case 11, a bypass passage 15 that bypasses the heater core 13 and flows air (cold air) is formed above the heater core 13. A flat air-mix door that adjusts the air volume ratio between cold air reheated by the heater core 13 and cold air that bypasses the heater core 13 through the bypass passage 15 is provided between the evaporator 12 and the heater core 13. (Air volume ratio adjusting means) 16 is arranged.

  The air mix door 16 has a resin or metal door substrate, and has a structure in which an elastic seal material such as urethane foam is attached to the peripheral edge of the seal surfaces on both sides of the door substrate. The air mix door 16 is integrally coupled with a rotation shaft arranged in the horizontal direction, and can be rotated in the vehicle vertical direction together with the rotation shaft. The air mix door 16 serves as a temperature adjusting means for adjusting the temperature of air blown into the passenger compartment by adjusting the air volume ratio.

  The rotation shaft of the air mix door 16 is rotatably supported by the air conditioning case 11, and one end portion of the rotation shaft protrudes outside the air conditioning case 11, and a servo motor or the like is provided via a link mechanism (not shown). It is connected to an actuator mechanism using the above, or a manual operation mechanism, and the rotational position of the air mix door 16 is adjusted by this actuator mechanism or manual operation mechanism.

  Further, in the air conditioning case 11, a wall portion 17 extending in a substantially vertical direction with a predetermined interval from the heater core 13 is integrally formed in the air conditioning case 11 at a portion on the air downstream side (vehicle rear side) of the heater core 13. Has been. In this embodiment, the bottom surface of the air conditioning case 11 and the wall surface 17 form a warm air passage 18 that extends upward immediately after the heater core 13. The downstream side (upper side) of the hot air passage 18 merges with the cold air bypass passage 15 in the upper portion of the heater core 13 to form a mixing space 19 that mixes the cold air and the hot air.

  On the downstream side of the mixing space 19 in the air conditioning case 11, a blowing mode switching unit is configured. First, a defroster opening 20 is opened on the upper surface of the air conditioning case 11. The defroster opening 20 is provided with warm air from the warm air passage 18 or air-conditioning air whose temperature is adjusted from the mixing space 19 and is connected to a defroster outlet in the vehicle compartment via a defroster duct (not shown). The conditioned air is blown out from the defroster outlet toward the inner surface of the vehicle front window glass.

  The defroster opening 20 is opened and closed by a flat defroster door 21. The defroster door 21 is rotated by a rotation shaft disposed in the horizontal direction in the vicinity of the upper surface portion of the air conditioning case 11. The defroster door 21 has a resin or metal door substrate, and has a structure in which an elastic seal material such as urethane foam is adhered to the seal side periphery of the door substrate. A rotation shaft is arranged at the upstream side portion of the cold air flow from the cold air bypass passage 15 toward the mixing space 19 in the peripheral portion of the defroster opening 20 so that the tip of the defroster door 21 faces the downstream side of the cold air flow. It is.

  A face opening 22 is opened at a position on the vehicle rear side of the defroster opening 20 on the substantially upper surface of the air conditioning case 11. This face opening 22 is where cold air from the bypass passage 15 or air-conditioning air whose temperature is adjusted from the mixing space 19 flows in, and is connected to a face outlet in the vehicle compartment via a face duct (not shown). Air conditioned air is blown out from the face outlet toward the head and chest of the passengers in the passenger compartment.

  The face opening 22 is opened and closed by a flat face door 23. The face door 23 is configured to rotate substantially up and down by a rotation shaft disposed in the horizontal direction in the vicinity of the rear end portion of the air conditioning case 11. The rotation shaft of the face door 23 and the door substrate are integrally formed of resin, and an elastic sealing material such as urethane foam is attached to the periphery of the seal side surface of the door substrate.

  In the air conditioning case 11, a foot opening 24 opens substantially downward at a portion below the face opening 22. The foot opening 24 is for receiving warm air from the warm air passage 18 or air-conditioning air whose temperature is adjusted from the mixing space 19. The foot opening 24 is divided in the vehicle left-right direction below the opening and is not shown. A duct is connected, and air-conditioned air is blown out from the outlet of the foot duct toward the feet of passengers in the vehicle interior.

  The foot opening 24 is opened and closed by a foot door (foot door means in the present invention) 25. Next, the tunnel frame 26 and the foot door 25 constituting the hot air bypass passage 27, which is a main part of the present embodiment, will be sequentially described. 2 is a cross-sectional view taken along the line II-II in FIG. 1, and FIG. 3 is a schematic perspective view showing the tunnel-like frame body 26 in FIG. FIG. 4 is a schematic perspective view showing the cantilevered shaft rotation type door 25A in FIG.

  The air conditioning unit 10 of the present embodiment includes a warm air bypass passage 27 that guides a part of the warm air flowing out from the warm air passage 18 to the defroster opening 20 side. It is formed by a tunnel-like frame body 26 that is incorporated in the case 11 and passes from the rear end of the hot air passage 18 to the vehicle rear side of the cold air bypass passage 15 so as to be substantially orthogonal. In addition, 11a in FIG. 2 is a cross section of the frame part which the air mix door 16 which is not shown in figure seals.

  As shown in the partial cross-sectional view of FIG. 2, the tunnel-like frame body 26 is incorporated in the central portion of the air-conditioning case 11 in the left-right direction of the vehicle, and cold air bypass passages 15 are provided on the left and right sides of the tunnel-like frame body 26. Passing through. In addition, although FIG. 2 shows only a cross-sectional portion, the hot air passage 18 passes through the left and right sides of the tunnel-like frame 26 on the lower side of the tunnel-like frame 26, similarly to the cold air bypass passage 15.

  As shown in FIG. 3, the tunnel frame 26 is formed in a rectangular shape in this embodiment, and has an inlet 26 a that takes in a part of the hot air flowing out from the rear end of the hot air passage 18, and the hot air that has been taken in An outlet 26b that flows out in the vicinity of the defroster opening 20 and an opening 26c for inserting a protruding plate 254 (see FIGS. 1 and 4) provided on a foot door 25 described later are formed in the wall on the rear side of the vehicle. ing. It should be noted that the outflow side of the tunnel-shaped frame body 26 has a cold air bypass so that the warm air flowing out from the tunnel-shaped frame body 26 and the cold air flowing out from the cold air bypass passage 15 are mixed when incorporated in the air conditioning case 11. It is set below the upper end of the passage 15 by a predetermined interval.

  Next, in this embodiment, as the foot door 25, as shown in FIG. 4, a cantilevered shaft rotation type door 25 </ b> A in which a rotation shaft 251 is arranged on one side surface of the substrate portion 252 is used. The foot door 25A has a structure in which a rotating shaft 251 and a substrate portion 252 are integrally formed of resin, and an elastic sealing material 253 such as urethane foam is attached to the peripheral edge of the sealing side surface of the substrate portion 252. Yes. As a feature of the present embodiment, a protruding plate portion 254 is formed integrally with the central portion of the substrate portion 252 on the anti-seal side on the rotation tip side so as to protrude in the anti-seal side rotation direction.

  The foot door 25 </ b> A is pivoted in a substantially vertical direction by a pivot shaft 251 disposed horizontally in the lower portion of the air-conditioning case 11 and adjacent to the vehicle rear side wall surface of the tunnel-like frame body 26. It is like that. Then, when the foot door 25A is moved to the side where the foot opening 24 is fully opened, the protruding plate portion 254 provided on the foot door 25A is inserted into the tunnel-shaped frame body 26 from the opening 26c and passes through the hot air bypass passage 27. The area is reduced.

  The defroster door 21, the face door 23, and the foot door 25A as the blowing mode door are connected to an actuator mechanism using a servo motor or a manual operation mechanism via a common link mechanism (not shown). The blowing mode is varied by changing the rotational position of the blowing mode door by a manual operation mechanism.

  Next, the state of each blowing mode in the air conditioning unit 10 having the above configuration will be specifically described with reference to FIGS. 1 and 5 to 8. First, FIG. 1 is a schematic longitudinal sectional view of an air conditioning unit 10 showing a foot mode state. In the foot mode, the opening degree of the foot door 25A is fully opened, the face door 23 is fully closed, and the defroster door 21 is about 20% opening degree. Moreover, the air mix door 16 is operated to the air | flow volume ratio position used as the set blowing air temperature.

  The blown air from the blower unit is heated by the heater core 13, passes through the mixing space 19 from the warm air passage 18, and flows out from the foot opening 24. The wind flowing out from the foot opening 24 is blown out from the outlet through the foot duct toward the occupant's feet, and mainly heats the passenger compartment.

  Further, the warm air flowing into the tunnel frame 26 from the warm air passage 18 flows out from the defroster opening 20, blows out from the defroster outlet to the front window glass through the defroster duct, and prevents the window glass from fogging. Is done. At this time, since the foot door 25A is fully open, the projecting plate portion 254 provided on the foot door 25A is inserted into the inside through the opening 26c of the tunnel frame 26 to reduce the passage area of the hot air bypass passage 27. . For this reason, by not increasing the pressure in the vicinity of the defroster opening 20, the cold air from the cold air bypass passage 15 also flows and the hot defroster is suppressed from being generated.

  FIG. 5 is a schematic longitudinal sectional view of the air conditioning unit 10 showing the state of the foot defroster mode. When the foot defroster mode is selected by manual operation, the face door 23 remains closed and the defroster door 21 and the foot door 25A are substantially half open. Further, the air mix door 16 is normally operated to fully close the bypass passage 15 as the maximum heating position.

  The blown air from the blower unit is heated by the heater core 13, passes through the mixing space 19 from the warm air passage 18, and flows out from the foot opening 24. The wind flowing out from the foot opening 24 is blown out from the outlet through the foot duct toward the occupant's feet, and mainly heats the passenger compartment.

  Further, the warm air flowing into the tunnel frame 26 from the warm air passage 18 flows out from the defroster opening, blows out from the defroster outlet to the front window glass through the defroster duct, and prevents the window glass from being fogged. Done. At this time, since the foot door 25A is half open, the protruding plate portion 254 provided on the foot door 25A is not inserted into the opening 26c of the tunnel-like frame body 26, and the passage area of the hot air bypass passage 27 is reduced. There is nothing. For this reason, sufficient warm air is blown out from the defroster outlet toward the front window glass to prevent the window glass from being fogged.

  FIG. 6 is a schematic longitudinal sectional view of the air conditioning unit 10 showing the state of the bi-level mode. In this bi-level mode, the face door 23 and the foot door 25A are substantially half open, and the defroster door 21 is fully closed. In this state, the air mix door 16 is operated to an intermediate position between the maximum cooling position and the maximum heating position.

  Although it is appropriately mixed in the mixing space 19, the temperature of the air toward the face opening 22 is appropriately lower than the temperature of the air toward the foot opening 24, and flows through the face opening 22 and the foot opening 24. As a result, the temperature of the air blown to the occupant's head and chest is appropriately lower than the temperature of the air blown to the occupant's feet, and a comfortable temperature distribution of the head-cold foot heat type is obtained as the bi-level mode.

  FIG. 7 is a schematic longitudinal sectional view of the air conditioning unit 10 showing the state of the face mode. In the face mode, the opening degree of the face door 23 is fully opened, and the other defroster door 21 and the foot door 25A are fully closed. The air mix door 16 is normally operated with the bypass passage 15 fully open at the maximum cooling position. Air blown from the blower unit is cooled by the evaporator 12, passes through the mixing space 19 from the bypass passage 15, and flows out from the face opening 22. The wind that flows out from the face opening 22 is blown out through the face duct from the face outlet to the occupant's head and chest, and mainly cools the passenger compartment.

  Further, when it is desired to quickly stop the fogging of the window glass, the defroster mode shown in FIG. 8 is selected by manual operation. In this defroster mode, the opening degree of the defroster door 21 is fully opened, and the other face door 23 and foot door 25A are fully closed. Thereby, the blowing air from the blower unit is blown out from the defroster outlet toward the front window glass, and the window glass is prevented from being fogged.

  In the foot defroster mode of FIG. 5 and the defroster mode of FIG. 8, the air mix door 16 is in the maximum heating position with the bypass passage 15 fully closed, and in the face mode of FIG. Although the maximum cooling position is fully open, this is for the sake of simplifying the air flow path and does not limit the position of the air mix door 16.

  Next, the features and effects of this embodiment will be described. First, a protruding plate portion 254 is provided in a part of the foot door 25A that opens and closes the foot opening 24, and the protruding plate portion 254 is inserted into the hot air bypass passage 27 when the foot door 25A is moved to the side that fully opens the foot opening 24. Thus, the passage area of the hot air bypass passage 27 is reduced.

  This is because the hot air guided by the hot air bypass passage 27 formed by the tunnel-like frame body 26 increases the pressure in the vicinity of the defroster opening 20 in the foot mode and becomes a hot defroster. . That is, when the foot door 25A is moved to the side that fully opens the foot opening 24 as the foot mode, the passage area of the hot air bypass passage 27 is reduced by using the protruding plate portion 254 provided in the foot door 25A. .

  According to this, in the foot mode, the passage area of the hot air bypass passage 27 is reduced, and by not increasing the pressure in the vicinity of the defroster opening 20, cold air can flow in and it can be suppressed from becoming a hot defroster. . Further, in the foot defroster mode, which is the idea for forming the warm air bypass passage 27 by the tunnel-like frame body 26, the defroster opening 20 and the foot opening 24 are substantially half open.

  For this reason, the protruding plate portion 254 provided on the foot door 25A does not reduce the passage area of the hot air bypass passage 27, and the cool air becomes a cool defroster by the hot air guided to the vicinity of the defroster opening 20 in the hot air bypass passage 27. Can be suppressed. That is, by restricting the amount of hot air passing through the hot air bypass passage 27 in correspondence with the fully open foot door 25A, the occurrence of both the cool defroster state in the foot defroster mode and the hot defroster state in the foot mode is suppressed. can do.

  Further, in the foot mode in which the face opening 22 is fully closed, the foot opening 24 is fully open, and the mixed air is blown out with the defroster opening 20 set to approximately 20% opening, the protruding plate 254 has the hot air bypass passage 27. In the other blowout mode, the protruding plate portion 254 prevents the passage area of the hot air bypass passage 27 from being reduced.

  This focuses on the fact that the foot door 25A is in a position where the foot opening 24 is fully opened only in the foot mode. Accordingly, in the configuration of the present embodiment, the passage area of the hot air bypass passage 27 can be reduced only in the foot mode where the hot defroster is a problem, and the foot defroster having the foot opening 24 as an intermediate opening degree. In the mode, the bi-level mode, the face mode in which the foot opening 24 is fully closed, and the defroster mode, the passage area of the hot air bypass passage 27 is not reduced, and the blowing modes other than the foot mode may be affected. Absent.

  Further, the protruding plate portion 254 is formed integrally with the substrate portion 252 of the foot door 25A. According to this, when the base plate portion 252 of the foot door 25A is formed, the projecting plate portion 254 is integrally formed, so that the configuration of the present invention can be formed at a reduced cost. Further, the foot door means can be configured by using a cantilevered shaft rotating door 25A in which the rotating shaft 251 is arranged on one side surface of the substrate portion 252.

  Further, the rotation shaft 251 is adjacent to the rear side of the vehicle rear side wall surface of the tunnel-like frame body 26. According to this, when the foot door 25A rotates to the side that fully opens the foot opening 24, the protruding plate portion 254 protruding in the rotating direction can be inserted into the hot air bypass passage 27, and the hot air bypass The passage area of the passage 27 can be reduced. Further, the foot opening 24 is opened substantially downward. According to this, when the cantilevered shaft rotation type door 25A is used as the foot door means, the configuration of the present invention can be formed by opening the foot opening 24 substantially downward.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. FIG. 9 is a schematic longitudinal sectional view of the air conditioning unit 10 according to the second embodiment of the present invention, and shows a state in the foot mode. FIG. 10 is a schematic perspective view showing the butterfly shaft rotating door 25B in FIG. In the following embodiments, the same components as those in the first embodiment described above are denoted by the same reference numerals, description thereof will be omitted, and different configurations and features will be described.

  In this embodiment, as the foot door 25, a butterfly-type shaft rotation type door (foot door means referred to in the present invention) 25B in which a rotation shaft 251 is arranged on the substantially central side of the substrate portion 252 is used. As a feature of the present embodiment, a projecting plate portion 254 is integrally formed at the center portion on the anti-seal side on the rotation tip side of the substrate portion 252 so as to protrude in the rotation direction on the anti-seal side. Thus, it can comprise using the butterfly-type axis | shaft rotation type door 25B as a foot door means.

(Third embodiment)
Next, a third embodiment of the present invention will be described. FIG. 11 is a schematic longitudinal sectional view of the air conditioning unit 10 according to the third embodiment of the present invention, and shows the state of the foot mode. FIG. 12 is a schematic perspective view showing the surface sliding door 25C in FIG. Features different from the above-described embodiment will be described.

  In the present embodiment, as the foot door 25, a surface slide type door 25C that slides in a substantially planar direction of the substrate portion 252 to open and close the opening is used. As a feature of the present embodiment, a projecting plate portion 254 is integrally formed by protruding in the sliding direction on the anti-seal side at the center portion on the anti-seal side of the substrate portion 252 on the tunnel frame 26 side. Thus, it can comprise using the surface slide type door 25C as a foot door means.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described. FIG. 13 is a schematic longitudinal sectional view of the air conditioning unit 10 according to the fourth embodiment of the present invention, and shows the state of the foot mode. FIG. 14 is a schematic perspective view showing the pivoting surface sliding door 25D in FIG. Features different from the above-described embodiment will be described. In the present embodiment, the foot opening 24 is opened and closed by a foot door 25D using a pivoting surface sliding door (see FIG. 13).

  The foot door 25D is pivoted in a substantially vertical direction by a pivot shaft 251 disposed in the horizontal direction adjacent to the vehicle rear side of the vehicle rear side wall surface of the tunnel-shaped frame 26 at the lower portion of the air conditioning case 11. It is like that. The shaft-rotating surface sliding door of this embodiment has the characteristics of the shaft-rotating door and the surface-sliding door, and rotates the substrate portion 252 as shown in FIG. The rotary shaft 251 includes a substrate portion 252 provided so as to protrude from the rotary shaft 251 in the outer peripheral direction and having a flat surface in the axial direction.

  In the present embodiment, the substrate portion 252 has a fan shape in accordance with the foot opening 24. A pivot shaft 251 of the pivoting surface slide type door is disposed beside the foot opening 24. Then, by rotating the rotation shaft 251, the substrate portion 252 slides in a direction orthogonal to the ventilation direction of the foot opening 24 and closes the foot opening 24 by overlapping the foot opening 24, The degree of opening is increased as the position deviates from the foot opening 24, and the position is fully opened by being completely displaced from the foot opening 24.

  In the present embodiment, the openings are applied to the foot openings 24 on the left and right sides of the air conditioning case 11, and the left and right substrate portions 252 are connected by the rotation shaft 251 and used in conjunction with each other. Further, as a feature of the present embodiment, a belt-like plate portion 255 is integrally provided on the rotation tip side of both the substrate portions 252 and is connected to project from the center portion of the belt-like plate portion 255 in the turning direction. Is forming.

  The pivot shaft 251, the two substrate portions 252, the belt-like plate portion 255 and the projecting plate portion 254 of the foot door 25 </ b> D are integrally formed of resin, and an elastic seal lip (not shown) is formed on the outer periphery of the substrate portions 252 with an elastomer resin or the like. It has a formed structure. This pivoting surface slide type door has the same effect even if it is arranged on the case outer surface side of the foot opening 24, but in this embodiment, a foot duct is connected to the outer surface side of the foot opening 24. Therefore, it is arranged on the case inner surface side of the foot opening 24.

  As described above, the pivotable surface-sliding door 25 </ b> D is used as the foot door 25, in which the substrate portion 252 protrudes in the outer peripheral direction with respect to the rotational shaft 251 and has a plane in the rotational shaft direction. As described above, the foot door means can be configured using the pivoting surface slide type door 25D. Further, in the case of using a pivoting surface sliding door 25D as the foot door 25, the structure of the present invention can be formed by opening the foot opening 24 in the left-right direction of the vehicle.

(Other embodiments)
The present invention is not limited to the above-described embodiments, and can be modified or expanded as follows. For example, in the above-described embodiment, the tunnel-like frame body 26 is disposed at the vehicle lateral direction center portion of the air conditioning case 11, but may be disposed at both ends of the air conditioning case 11 in the vehicle lateral direction. You may arrange | position at both ends.

  In the above-described embodiment, the tunnel frame 26 is configured separately from the air conditioning case 11. However, if possible, the tunnel frame 26 may be integrated with the air conditioning case 11, or an air conditioning unit with independent left and right controls. If it exists, you may comprise integrally with the partition member of right-and-left space. In the above-described embodiment, the present invention is applied to a so-called center placing unit that is arranged at the center of the left and right sides of the vehicle. However, the so-called lateral placing unit that arranges the idea of the present invention by the air flow in the left and right direction of the vehicle. You may apply to.

It is a schematic longitudinal cross-sectional view of the air conditioning unit 10 by 1st Embodiment of this invention, and shows the state of foot mode. It is II-II sectional drawing in FIG. It is a schematic perspective view which shows the tunnel-shaped frame 26 in FIG. FIG. 2 is a schematic perspective view showing a cantilevered shaft rotation type door 25 </ b> A in FIG. 1. It is a schematic longitudinal cross-sectional view of the air conditioning unit 10 which shows the state of foot defroster mode. It is a schematic longitudinal cross-sectional view of the air conditioning unit 10 which shows the state of bilevel mode. It is a schematic longitudinal cross-sectional view of the air conditioning unit 10 which shows the state of faceta mode. It is a schematic longitudinal cross-sectional view of the air conditioning unit 10 which shows the state of a defroster mode. It is a schematic longitudinal cross-sectional view of the air conditioning unit 10 by 2nd Embodiment of this invention, and shows the state of foot mode. FIG. 10 is a schematic perspective view showing a butterfly-type shaft turning door 25 </ b> B in FIG. 9. It is a schematic longitudinal cross-sectional view of the air conditioning unit 10 by 3rd Embodiment of this invention, and shows the state of foot mode. It is a schematic perspective view which shows the surface slide type door 25C in FIG. It is a schematic longitudinal cross-sectional view of the air conditioning unit 10 by 4th Embodiment of this invention, and shows the state of foot mode. It is a schematic perspective view which shows the axis | shaft rotation type surface slide type door 25D in FIG.

Explanation of symbols

11 ... Air conditioning case 13 ... Heater core (heat exchanger for heating)
DESCRIPTION OF SYMBOLS 15 ... Cold-air bypass passage 16 ... Air mix door 18 ... Warm air passage 20 ... Defroster opening part 22 ... Face opening part 24 ... Foot opening part 25A ... Foot door (cantilevered axis rotation type door, foot door means)
25B ... Foot door (butterfly type pivoting door, foot door means)
25C ... Foot door (plane sliding door, foot door means)
25D ... Foot door (shaft rotation type surface slide type door, foot door means)
26 ... Tunnel-shaped frame 27 ... Warm air bypass passage 251 ... Rotating shaft 252 ... Substrate part 254 ... Projecting plate part

Claims (10)

An air conditioning case (11) that forms an air passage for air to the passenger compartment;
A heating heat exchanger (13) disposed in the air conditioning case (11) for heating the air;
A cold air bypass passage (15) formed above the heating heat exchanger (13) in the air conditioning case (11), and bypassing the heating heat exchanger (13) and through which cold air flows;
A hot air passage (18) formed on the lower side of the cold air bypass passage (15) in the air conditioning case (11) and through which the hot air that has passed through the heat exchanger for heating (13) flows;
Air that is arranged in the air conditioning case (11) and adjusts the ratio between the amount of air that passes through the heat exchanger for heating (13) and becomes warm air and the amount of cold air that passes through the cold air bypass passage (15). Mix door (16),
A defroster opening (20) that is disposed above the cold air bypass passage (15) and blows out the air mixed with the warm air and the cold air toward the window glass in the vehicle interior;
A face opening (22) provided at the downstream end of the air passage in the air conditioning case (11), and for blowing out the air, which is a mixture of the warm air and the cold air, toward the occupant upper body side in the vehicle interior;
A foot opening (24) that is disposed closer to the hot air passage (18) than the defroster opening (20) and blows out the air that is a mixture of the hot air and the cold air toward the passenger's feet in the vehicle compartment. When,
A hot air bypass passage (passing through the cold air bypass passage (15) substantially orthogonally and guiding a part of the hot air flowing out from the hot air passage (18) to the defroster opening (20) side ( 27) In a vehicle air conditioner comprising a tunnel frame (26) forming
While providing a protruding plate part (254) in a part of the foot door means (25A-25D) for opening and closing the foot opening (24),
When the foot door means (25A to 25D) is moved to the side that fully opens the foot opening (24), the protruding plate portion (254) is inserted into the hot air bypass passage (27) and the hot air bypass passage is inserted. (27) The air conditioning apparatus for vehicles characterized by reducing the passage area.   In the foot mode in which the face opening (22) is fully closed, the foot opening (24) is fully open, and the defroster opening (20) is at a predetermined opening to blow out the mixed air, the protruding plate portion (254) reduces the passage area of the hot air bypass passage (27), and the protruding plate portion (254) does not reduce the passage area of the hot air bypass passage (27) when in another blowing mode. The vehicle air conditioner according to claim 1.   The vehicular air conditioner according to claim 1 or 2, wherein the protruding plate portion (254) is formed integrally with a base plate portion (252) of the foot door means (25A to 25D).   A cantilevered shaft rotation type door (25A) in which a rotation shaft (251) is arranged on one side surface of the substrate portion (252) is used as the foot door means. The vehicle air conditioner according to any one of the above.   The butterfly-type shaft rotation type door (25B) in which a rotation axis (251) is arranged at a substantially central side of the substrate portion (252) is used as the foot door means. The vehicle air conditioner according to any one of the above.   The surface sliding door (25C) which slides in the substantially plane direction of the said board | substrate part (252) and opens and closes an opening part as said foot door means is used in any one of Claim 1 thru | or 3 characterized by the above-mentioned. The vehicle air conditioner described.   As the foot door means, a pivotable surface sliding door (25D) in which the substrate portion (252) protrudes in one outer peripheral direction with respect to the rotational shaft (251) and has a flat surface in the rotational shaft direction is used. The vehicle air conditioner according to any one of claims 1 to 3, wherein the vehicle air conditioner is provided.   8. The vehicle according to claim 4, wherein the rotation shaft (251) is adjacent to a rear side of a vehicle rear side wall surface of the tunnel-shaped frame (26). Air conditioner.   The vehicle air conditioner according to any one of claims 4 to 6, wherein the foot opening (24) is opened substantially downward.   The vehicle air conditioner according to claim 7, wherein the foot opening (24) is opened in a lateral direction of the vehicle.

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