JP2008087576A - Vehicular air-conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular air-conditioner capable of reducing the difference in supply air temperatures in the supply mode in which two opening parts are opened without increasing the manufacturing cost and the ventilation resistance. <P>SOLUTION: The vehicular air-conditioner comprises an air-conditioning case 11, a heater core 13, a hot air passage 19, a cold air bypass passage 15, an air-mix door 16, an air mixing unit 20 for mixing cold air with hot air, a defroster opening part 21 to be connected to a defroster outlet for supplying conditioned air to a front window glass of a vehicle, a face opening part 24 connected to a face outlet for supplying conditioned air toward an upper half body of an occupant in a cabin, and a foot opening part 27 connected to a foot outlet for supplying conditioned air toward feet of the occupant in the cabin. A recessed groove part 30 extending toward the defroster opening part 21 is formed in a side wall of the air-conditioning case 11 on the downstream side of the heater core 13, and the groove part 30 is covered by a foot door 28 sliding along the side wall of the air-conditioning case 11 to form a hot air passage. The difference of the supply air temperature can be reduced thereby. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle air conditioner, and in particular, aims to reduce a difference in blowing temperature in a foot blowing mode, a foot defroster blowing mode, and a bi-level blowing mode in which two openings are opened.

  Conventionally, as this type of air conditioner, for example, as shown in Patent Document 1, a cold air passage through which air that bypasses a heat exchanger for heating flows and a hot air passage through which air that passes through the heat exchanger flows flows. There is known an air conditioning case in which a baffle plate for flowing hot air from a hot air passage is arranged at a site.

  In this air conditioning case, a cooling heat exchanger and a heating heat exchanger are disposed, and a cold air passage through which air that bypasses the heating heat exchanger flows and a temperature through which the air that has passed through the heating heat exchanger flows. A wind passage is provided, and further, a face opening, a defroster blowout opening, and a foot blowout opening are provided on the downstream side of the merged portion of the cool air passage and the warm air passage.

  Then, a baffle plate having one end connected to the hot air passage and the other end opened upstream of the boundary portion between the face opening and the defroster outlet opening at the confluence portion of the cold air passage and the hot air passage. It is arranged. In addition, the baffle plate is formed in a shape having a substantially U-shaped cross section in order to suppress the draft resistance of the cold air from the cold air passage.

As a result, even if the distance between the end of the hot air passage, the face opening, and the defroster outlet opening is relatively large, the baffle plate causes the temperature to rise upstream of the boundary portion between the face opening and the defroster outlet opening. The wind can be supplied reliably and in an appropriate amount.
JP 2005-104250 A

  However, according to the above-mentioned Patent Document 1, the baffle plate is formed in a shape that suppresses the draft resistance. However, the baffle plate is substantially arranged by arranging the baffle plate at the junction of the cold air passage and the hot air passage. In this case, the resistance of the cold air from the cold air passage increases. In order to suppress this ventilation resistance, the space of the confluence | merging part of a cold air path and a warm air path must be enlarged as much as possible.

  Furthermore, since the other end of the baffle plate needs a space for providing an air mixing portion for mixing cold air and hot air, there is a problem that the volume of the air conditioning case increases. Furthermore, since this type of baffle plate is formed separately and assembled to the air conditioning case, there is a problem that manufacturing costs such as parts processing costs and assembly costs increase.

  In view of the above, an object of the present invention is to provide a vehicle air conditioner that can reduce the temperature difference in the blowing mode in which two openings are opened without increasing the manufacturing cost and ventilation resistance. To do.

In order to achieve the above object, the technical means described in claims 1 to 6 are employed. That is, in the first aspect of the present invention, the air conditioning case (11) that forms the air passage, the heating heat exchanger (13) that is installed in the air conditioning case (11) and heats the air, and the heating A hot air passage (19) through which the hot air passes through the heat exchanger (13), a cold air bypass passage (15) through which the cold air flows by bypassing the heating heat exchanger (13), and a hot air passage ( 19) an air mix door (16) for adjusting the air volume ratio between the warm air passing through the cool air and the cool air bypass passage (15), and the hot air and the cold air bypass passage (15 passing through the hot air passage (19)). ) And a defroster opening formed on the downstream side of the air mixing section (20) and connected to a defroster outlet for blowing conditioned air to the front window glass of the vehicle. Part (21) and air mixing part 20), a face opening (24) connected to a face outlet for blowing conditioned air toward the upper body of the passenger in the passenger compartment, and an air conditioning case (11) on the downstream side of the air mixing section (20) ), And a foot opening (27) connected to a foot outlet for blowing out conditioned air toward the feet of passengers in the passenger compartment,
A concave groove (30) extending toward each opening (21, 24, 27) is provided on the side wall of the air conditioning case (11) on the downstream side of the heating heat exchanger (13), and the air conditioning case (11) A hot air passage is formed by covering the groove (30) with a movable plate (28) that slides along the side wall.

  According to this invention, the warm air which passed the heat exchanger for heating (13) can be guide | induced to the upstream vicinity of each opening part (21, 24, 27). Thereby, in the blowing mode in which the two openings (21, 24, 27) are opened, the hot air that has passed through the heating heat exchanger (13) is guided to the opened openings (21, 24, 27). Can do. Therefore, the blowout temperature difference can be reduced.

  Moreover, it can form, without enlarging the space of the air mixing part (20) which cold air and warm air mix by forming a warm air path with a concave groove part (30). Therefore, the warm air passage can be formed without increasing the ventilation resistance.

  In the invention described in claim 2, the groove (30) is integrally formed so that at least the side wall of the air conditioning case (11) of the warm air passage (19) and the air mixing unit (20) bulges outward. It is characterized by being. According to the present invention, the hot air passage can be integrally formed when the air conditioning case (11) is molded. Thereby, the manufacturing cost is not increased.

  The invention according to claim 3 is characterized in that the movable plate (28) is a foot switching door (28) for opening and closing the foot opening (27). According to the present invention, since the movable plate (28) only needs to use the foot switching door (28), the warm air passage can be formed without adding a separate component. Thereby, the manufacturing cost is not increased.

  In the invention according to claim 4, the movable plate (28) has the warm air flowing through the groove (30) when in the bi-level blowing mode in which the face opening (24) and the foot opening (27) are opened. The groove (30) is opened so as to lead to the face opening (24) and the foot opening (27).

  According to this invention, the warm air which passed the heat exchanger for heating (13) can be supplied to the upstream of a face opening part (24) and a foot opening part (27). Thereby, reduction of the blowing temperature difference of a face opening part (24) and a foot opening part (27) can be aimed at.

  According to the fifth aspect of the present invention, the movable plate (28) is configured such that when the defroster opening (21) and the foot opening (27) are in the foot blowing mode, the warm air flowing through the groove (30) is defrosted. The groove (30) is opened so as to lead to the opening (21) and the foot opening (27).

  According to this invention, the warm air which passed the heat exchanger for heating (13) can be supplied to the upstream of the defroster opening (21) and the foot opening (27). Thereby, reduction of the blowing temperature difference of a defroster opening part (21) and a foot opening part (27) can be aimed at.

  In the invention of claim 6, the movable plate (28) has the warm air flowing through the groove (30) in the foot defroster blowing mode in which the defroster opening (21) and the foot opening (27) are opened. The groove (30) is opened so as to lead to the defroster opening (21) and the foot opening (27).

  According to this invention, the warm air which passed the heat exchanger for heating (13) can be supplied to the upstream of the defroster opening (21) and the foot opening (27). Thereby, reduction of the blowing temperature difference of a defroster opening part (21) and a foot opening part (27) can be aimed at.

  In addition, the code | symbol in the bracket | parenthesis of each said means shows a corresponding relationship with the specific means of embodiment mentioned later.

  Hereinafter, a vehicle air conditioner according to an embodiment of the present invention will be described with reference to FIGS. 1 to 6. FIG. 1 is a longitudinal sectional view showing an overall configuration of an air conditioning unit 10 of a vehicle air conditioner in the present embodiment. FIG. 2 is a cross-sectional view taken along line AA shown in FIG. FIG. 3 is a perspective view showing the external shape of the foot door 28 in the present embodiment.

  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 arranged offset from the center part to the passenger seat side in the lower part of the instrument panel in the passenger compartment. On the other hand, the air conditioning unit 10 is arranged in the vehicle left and right direction in the lower part of the instrument panel in the passenger compartment. It is arranged at a substantially central part.

  As is well known, the blower unit is composed of an inside / outside air switching box for switching and introducing inside air (vehicle interior air) and outside air (vehicle outside air), and a blower for sucking and blowing air through the inside / outside air switching box. The air conditioning unit 10 is of a type in which both an evaporator 12 that is a cooling heat exchanger and a heater core 13 that is a heating heat exchanger are integrally incorporated in a common air conditioning case 11.

  The air conditioning case 11 is made of a resin molded product having a certain degree of elasticity and excellent strength, such as polypropylene. The air-conditioning case 11 is specifically composed of a plurality of divided cases. The plurality of divided cases accommodate the devices such as the heat exchangers 12 and 13 and a door described later, and then a fastening means such as a metal spring clip or a screw. Thus, the air conditioning unit 10 is configured as a single unit.

  The air conditioning unit 10 is arranged in the form shown in FIG. 1 with respect to the front / rear, left / right and up / down directions of the vehicle at a substantially central portion of the lower part of the instrument panel in the passenger compartment. The air inlet 14 is formed in the part. Air-conditioned air blown from the blower unit described above flows into the air inlet 14.

  In the air conditioning case 11, an evaporator 12 is disposed at a site on the vehicle front side immediately after the air inlet 14. The evaporator 12 is arranged in the vertical direction so as to cross the passage in the air conditioning case 11 in a thin shape in the vehicle front-rear direction. Therefore, the blown air from the air inlet 14 flows into the front surface of the evaporator 12 extending in the vehicle vertical direction. As is well known, the evaporator 12 absorbs the latent heat of evaporation of the refrigerant in the refrigeration cycle from the conditioned air to cool the conditioned air.

  And the heater core 13 is arrange | positioned at predetermined intervals in the air flow downstream (vehicle rear side) of the evaporator 12. The heater core 13 is disposed on the lower side in the air conditioning case 11 so as to be inclined toward the front side of the vehicle. The heater core 13 reheats the cold air that has passed through the evaporator 12, and hot water (engine cooling water) flows through the heater core 13 and heats the air using the hot water as a heat source.

  In the air passage in the air conditioning case 11, a cold air bypass passage 15 that bypasses the heater core 13 and flows cold air is formed above the heater core 13. A flat air mix door 16 that adjusts the mixing ratio of hot air heated by the heater core 13 and cold air that bypasses the heater core 13 through the cold air bypass passage 15 is disposed above the heater core 13. Yes.

  Here, the air mix door 16 is integrally coupled to a rotary shaft 17 disposed in the horizontal direction, and can be rotated together with the rotary shaft 17 in the vehicle vertical direction. 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 mixing ratio.

  The rotating shaft 17 is rotatably supported by the air conditioning case 11, and one end portion of the rotating shaft 17 protrudes to the outside of the air conditioning case 11 and is coupled to a link mechanism (not shown), so that a temperature control mechanism (servo) of the air conditioner is provided. The actuator is rotated by an actuator such as a motor. The air mix door 16 has a resin or metal door substrate integrally coupled to the rotary shaft 17, and has a structure in which an elastic seal material such as urethane foam is attached to both front and back surfaces of the substrate.

  In the air conditioning case 11, a wall surface 18 is provided on the air downstream side of the heater core 13 (on the vehicle rear side) with a predetermined interval between the heater core 13 and a face opening 24, which will be described later, from below. 11 is integrally formed.

  A warm air passage 19 is formed by the wall surface 18 from immediately after the heater core 13 toward the upper side or the vehicle rear side. Hot air flows through the heater core 13 in the hot air passage 19. In the air conditioning case 11, an air mixing unit that mixes the cold air and the hot air at a portion indicated by a two-dot chain line in the drawing is provided on the air downstream side (upper side) of the cold air bypass passage 15 and the hot air passage 19. 20 is formed.

  And in the upper part of the air-conditioning case 11 of the downstream end of the air mixing part 20, the defroster opening part 21 is formed in the site | part of the vehicle front side so that it may open in the vehicle front direction upper side. The defroster opening 21 is supplied with temperature-controlled conditioned air from the air mixing unit 20 and is connected to a defroster outlet through a defroster duct (not shown). Air conditioned air is blown toward the inner surface.

  The upstream side of the defroster opening 21 is opened and closed by a defroster door 22 which is a rotary door type defroster switching door means. The defroster door 22 has an outer peripheral portion 22a formed in a curved shape, end plate portions 22b provided at both ends of the outer peripheral portion 22a, and a rotation shaft 28 formed on each of the end plate portions 22b. And a drum-shaped rotary door whose section is formed in a substantially fan shape. It is rotatably supported on the side wall of the air conditioning case 11 by the rotation shafts 28 of the end plate portions 22b at both ends.

  The rotation shaft 28 is disposed near the upper end of the air mixing unit 20, and the defroster door 22 rotates the rotation shaft 28 toward the defroster opening 21, so that the defroster opening 21 is fully opened from fully closed. It is arrange | positioned so that it may open to. Further, the end plate portion 22 b slides along the side wall surface of the air conditioning case 11 to switch the open / close state of the defroster opening 21.

  Next, a face opening 24 that protrudes slightly toward the vehicle rear side is formed at a position on the vehicle rear side (occupant side) with respect to the defroster opening 21, and the temperature-controlled conditioned air is formed in the face opening 24. Is introduced through the air mixing section 20. In addition, the face opening 24 is connected to a face air outlet disposed on the upper side of the central portion of the instrument panel through a face duct (not shown). And blow out conditioned air.

  The face opening 24 is opened and closed by a flat butterfly type face door 25. The face door 25 is installed on the upstream side of the face opening 24 and is rotatably supported by a rotation shaft 26 arranged in the horizontal direction.

  Foot openings 27 are formed at both ends of the side wall of the air conditioning case 11 on the front side of the vehicle with respect to the face opening 24. Air-conditioned air whose temperature is controlled from the air mixing unit 20 flows into the foot opening 27.

  A foot passage is provided on each of the left and right sides (not shown) on the air downstream side of the foot opening 27, and a front seat foot passage is opened in the middle of the foot passage. The conditioned air from the front seat foot passage is blown out to the left and right passenger feet of the front seat through a front seat foot duct (not shown) and a front seat foot outlet.

  Further, a rear seat foot duct (not shown) and a rear seat foot outlet are connected to the end of the foot passage, and air-conditioned air is blown out to the left and right occupant feet of the rear seat through the rear seat foot outlet. . The foot opening 27 is opened and closed by a foot door 28 that is a rotary foot switching door.

  As shown in FIGS. 1 and 3, the foot door 28 is integrally coupled to the left and right door substrate portions 28 a formed in a substantially fan shape and a rotating shaft 29, and can be rotated in the vehicle front-rear direction together with the rotating shaft 29. It is a movable plate. The foot door 28 is rotatably supported by a rotating shaft 29 that is disposed in the horizontal direction on the vehicle rear side of the cold air bypass passage 15.

  By the way, the foot door 28, the above-described defroster door 22, and the face door 25 are control door means for blowing mode switching, and one end portions of the rotary shafts 23, 26, and 29 are protruded outside the air conditioning case 11. It is connected to a link mechanism (not shown) and is operated in conjunction by a blow mode switching mechanism (an actuator such as a servo motor).

  Here, the door substrate portion 28 a of the foot door 28 slides along the side wall surface of the air conditioning case 11 by the rotation of the rotating shaft 29 to switch the open / closed state of the foot opening 27. By the way, the foot door 28 of this embodiment is controlling the flow of the warm air which passed the heater core 13 collectively, when switching the opening-and-closing state of the foot opening part 27. FIG.

  In other words, in the blowing mode in which the two openings 21, 24, 27 are opened among the openings 21, 24, 27 described above, a part of the warm air that has passed through the heater core 13 is opened to the two openings. The parts 21, 24, 27 are configured to be supplied to the vicinity in the upstream.

  In the present embodiment, a concave groove 30 is provided on the side wall of the air conditioning case 11 between the hot air passage 19 and the air mixing unit 20, and the temperature that has passed through the heater core 13 in the vicinity of the upstream side of each opening 21, 24, 27. A part of the wind is supplied.

  Specifically, as shown in FIGS. 1 and 2, a concave groove 30 extending toward the upstream side of the defroster opening 21 is integrally formed on the side wall of the air conditioning case 11 on the downstream side of the heater core 13. A concave groove 30 is formed by integral molding so that the side wall of the air conditioning case 11 swells outward (in the vehicle width direction).

  More specifically, the groove portion 30 is formed so as to be wound from the lower portion of the heater core 13 to the upper portion of the heater core 13 toward the upstream side of the defroster opening 21 as shown by the filled portion shown in the drawing. That is, the upstream side is formed on the side wall of the air conditioning case 11 of the hot air passage 19, the downstream side is formed on the side wall of the air conditioning case 11 of the air mixing unit 20, and the hot air from the upstream side is further passed along the way It is connected in a curved shape so that it flows smoothly toward the downstream side. Further, the passage area of the groove is formed with an appropriate area.

  And the base of this groove part 30 is covered with the door board | substrate part 28a of the foot door 28. FIG. That is, by forming the concave groove 30 and the foot opening 27 on the same surface of the air conditioning case 11, the foot opening 27 can be caused by sliding the side wall of the air conditioning case 11 by the door substrate portion 28 a of the foot door 28. It is possible to cover a part of the groove part 30 while switching the open / close state of.

  In other words, by covering the groove portion 30 with the door substrate portion 28a, a hot air passage is formed inside the covered groove portion 30. Therefore, the outer shape of the door substrate portion 28a of the foot door 28 may be formed larger than the opening hole of the foot opening portion 27, and in particular, the downstream side of the groove portion 30 may be covered with the door substrate portion 28a.

  The warm air that has passed through the heater core 13 passes through the groove portion 30 covered by the door substrate portion 28a. That is, a hot air passage is formed in the groove portion 30 covered with the door substrate portion 28a, and further, the warm air that has passed through the heater core 13 from a portion where the groove portion 30 on the outer edge of the door substrate portion 28a is opened opens the opening portions 21 and 24. , 27 is blown out toward the upstream vicinity.

  Therefore, in the present embodiment, the outer shape of the door substrate portion 28a of the foot door 28 is set in the face blowing mode in which the foot opening 27 is fully closed and the face opening 24 is opened. More specifically, as shown in FIG. 1, the door substrate portion 28a is formed in a substantially fan shape, and the door substrate portion 28a is formed so as to cover the middle of the groove 30 and the entire foot opening 27. .

  In the bi-level blowing mode in which the face opening 24 and the foot opening 27 are opened, the foot door 28 is rotated so that the foot opening 27 is half open as shown in FIG. As a result, in the groove portion 30, the space between the vicinity of the lower side of the air mixing portion 20 and the vicinity of the upper side of the heater core 13 is covered with the door substrate portion 28 a.

  Therefore, the hot air that has passed through the heater core 13 can be supplied from the groove 30 near the lower side of the air mixing unit 20 toward the face opening 24, and the hot air that has passed through the heater core 13 can be supplied toward the foot opening 27. .

  In the foot blowing mode in which the defroster opening 21 and the foot opening 27 are opened, the foot door 28 is rotated so that the foot opening 27 is fully opened as shown in FIG. Thereby, the space between the vicinity of the upstream end of the groove portion 30 and the vicinity of the upper side of the heater core 13 is covered with the door substrate portion 28a. That is, a warm air passage is formed on the side wall side of the air mixing unit 20.

  Accordingly, hot air that has passed through the heater core 13 can be supplied from the vicinity of the upstream end of the groove portion 30 toward the defroster opening 21, and hot air that has passed through the heater core 13 can be supplied toward the foot opening 27.

  In the foot defroster blowing mode in which the defroster opening 21 and the foot opening 27 are opened, the foot door 28 is rotated so that the foot opening 27 is half open as shown in FIG. Thus, in the groove portion 30, the space between the vicinity of the lower side of the cold air bypass passage 15 and the vicinity of the upper side of the heater core 13 is covered with the door substrate portion 28 a.

  Accordingly, the hot air that has passed through the heater core 13 can be supplied from the groove 30 near the lower side of the air mixing unit 20 toward the defroster opening 21, and the hot air that has passed through the heater core 13 can be supplied toward the foot opening 27. .

  Next, the operation of the present embodiment having the above configuration will be described. As is well known, a vehicle air conditioner includes an electronic control device (not shown) to which operation signals from various operation members provided on an air conditioning operation panel and sensor signals from various sensors for air conditioning control are input. The rotation position of each control door 16, 22, 25, 28 is controlled by the output signal of this control device.

  The temperature of the air blown into the passenger compartment is adjusted by adjusting the air volume ratio between the cool air cooled by the evaporator 12 and flowing directly to the cool air bypass passage 15 side and the warm air heated by the heater core 13 at the air mix door 16. It is done with adjustment. The cold air and the warm air are mixed by the air mixing unit 20 and then blown out to a predetermined part in the vehicle interior according to the blowout mode.

  FIG. 4 shows a state of the bi-level blowing mode, where the defroster opening 21 is closed by the defroster door 22 and the face door 25 and the foot door 28 are at the positions shown in FIG. The parts 24 and 27 are set so as to be blown out at an air volume ratio of 50% from the face blowout port and 50% from the foot blowout port, for example.

  In the temperature adjustment region, the air mix door 16 opens the cold air bypass passage 15 and the hot air passage 19 by appropriate amounts, and cool air (arrow X shown in the figure) flowing from the evaporator 12 to the cold air bypass passage 15 side and the heater core 13. The warm air (arrow Y shown in the figure) passing through the air is mixed in the air mixing unit 20.

  The conditioned air adjusted to a desired temperature in this manner (arrow Z shown in the figure) is blown out toward the upper body side of the occupant through the face opening 24 and is blown out to the feet of the occupant through the foot opening 27. . Here, since the defroster opening 21 is in a closed state, the air mixing unit 20 in which cold air and hot air are mixed is formed in a space from the groove 30 to the face opening 24 and the foot opening 27.

  However, in the present embodiment, the door substrate portion 28 a of the foot door 28 half-opens the foot opening 27 and covers the middle of the groove 30. That is, it covers with the door board | substrate part 28a so that the groove part 30 may open in the downstream of the air mixing part 20. FIG.

  Thereby, a part of the warm air that has passed through the warm air passage 19 passes through the groove portion 30 covered with the door substrate portion 28a and is guided to the face opening 24, thereby blowing out the air toward the upper body side of the occupant. The temperature can be increased. Therefore, it is possible to avoid the phenomenon that the face blowing air temperature becomes extremely lower than the foot blowing air temperature.

  Further, in the foot blowing mode in which the air volume on the foot side is larger than the above-described bi-level blowing mode, the face opening 24 is closed by the face door 25 and the foot door 28 and the defroster door 22 are closed as shown in FIG. In the position shown in FIG. 5, the respective openings 21 and 27 are set so as to be blown out at an air volume ratio of, for example, 20% from the defroster outlet and 80% from the foot outlet.

  In the temperature adjustment region, the air mix door 16 opens the cold air bypass passage 15 and the hot air passage 19 by appropriate amounts, and cool air (arrow X shown in the figure) flowing from the evaporator 12 to the cold air bypass passage 15 side and the heater core 13. The warm air (arrow Y shown in the figure) passing through the air is mixed in the air mixing unit 20.

  The conditioned air adjusted to a desired temperature (arrow Z shown in the figure) is blown out toward the front window glass through the defroster opening 21 and is blown out to the feet of the occupant through the foot opening 27. Here, since the face opening 24 is in a closed state, the air mixing unit 20 in which cold air and warm air are mixed is formed in a space from the groove 30 to the defroster opening 21 and the foot opening 27.

  However, in this embodiment, the door substrate portion 28 a of the foot door 28 fully opens the foot opening 27 and covers the downstream side from the middle of the groove 30. That is, it covers with the door board | substrate part 28a so that the terminal of the downstream of the groove part 30 may open.

  Thereby, a part of the warm air that has passed through the warm air passage 19 passes through the groove portion 30 covered with the door substrate portion 28a and is guided to the defroster opening portion 21, whereby the blown air temperature that blows out toward the front window glass. Can be enhanced. Therefore, it is possible to avoid the phenomenon that the defroster blown air temperature becomes extremely lower than the foot blown air temperature, thereby improving the heating feeling.

  Furthermore, in the foot defroster blowing mode in which the air volume on the defroster side is larger than the above-described foot blowing mode, as shown in FIG. 6, here, for example, the air volume ratio is 50% from the defroster outlet and 50% from the foot outlet. The defroster door 22 and the foot door 28 are set to the positions shown in the drawing.

  That is, the defroster door 22 is opened more than in the foot blowing mode, and the foot door 28 is rotated so as to close the opening of the foot opening 27 to about half open compared to the foot blowing mode.

  The temperature adjustment region at this time is the same as described above, in which the air mixing door 16 mixes cold air (arrow X shown in the figure) and hot air (arrow Y shown in the figure) in the air mixing unit 20, and the desired temperature adjustment region. The conditioned air adjusted to the temperature (arrow Z shown in the figure) is blown out toward the front window glass through the defroster opening 21 and blown out to the feet of the occupant through the foot opening 27.

  Here, since the face opening 24 is in a closed state, the air mixing unit 20 in which cold air and warm air are mixed is formed in a space from the groove 30 to the defroster opening 21 and the foot opening 27.

  However, in this embodiment, the door substrate portion 28 a of the foot door 28 fully opens the foot opening 27 and covers the downstream side from the middle of the groove 30. That is, it covers with the door board | substrate part 28a so that the terminal of the downstream of the groove part 30 may open.

  Thereby, a part of the warm air that has passed through the warm air passage 19 passes through the groove portion 30 covered with the door substrate portion 28a and is guided to the defroster opening portion 21, whereby the blown air temperature that blows out toward the front window glass. Can be enhanced. Therefore, it is possible to avoid the phenomenon that the defroster blown air temperature becomes extremely lower than the foot blown air temperature, and to improve the defroster capacity and the heating feeling.

  In the face blowing mode in which the defroster opening 21 and the foot opening 27 are closed and the face opening 24 is opened, as shown in FIG. 1, the middle part of the groove 30 is covered with the door substrate 28a. There is no fear that the air is mixed in the air mixing unit 20 and mixed with the cold air from the face opening 24 to the face air outlet to impair the comfort.

  According to the vehicle air conditioner according to the above-described embodiment, the concave groove portions 30 extending toward the openings 21, 24, 27 are provided on the side wall of the air conditioning case 11 on the downstream side of the heater core 13. By forming the warm air passage by covering the groove portion 30 with the foot door 28 sliding along the side wall, the warm air that has passed through the heater core 13 can be guided to the vicinity of the upstream of each of the openings 21, 24, 27.

  Thereby, in the blowing mode in which the two openings 21, 24, 27 are opened, the warm air that has passed through the heater core 13 can be guided to the opened openings 21, 24, 27. Therefore, the blowout temperature difference can be reduced. Further, by forming the warm air passage with the concave groove portion 30, it can be formed without enlarging the space of the air mixing portion 20 where the cool air and the warm air are mixed. Therefore, the warm air passage can be formed without increasing the ventilation resistance.

  Further, the groove 30 is integrally formed so that at least the side walls of the air conditioning case 11 of the hot air passage 19 and the air mixing unit 20 bulge outward, so that the hot air passage is integrated when the air conditioning case 11 is molded. Can be formed. Thereby, the manufacturing cost is not increased.

  Further, by using the foot door 28 to cover the groove portion 30 in accordance with the blowing mode, it is possible to form the warm air passage without adding a separate component. Thereby, the manufacturing cost is not increased.

  Further, when the foot door 28 is in the bi-level blowing mode in which the face opening 24 and the foot opening 27 are opened, the groove 30 is configured so that the warm air flowing through the groove 30 is guided to the face opening 24 and the foot opening 27. The hot air that has passed through the heater core 13 can be supplied to the upstream side of the face opening 24 and the foot opening 27. Thereby, reduction of the blowing temperature difference of the face opening part 24 and the foot opening part 27 can be aimed at.

  Further, the foot door 28 is configured so that the warm air flowing through the groove 30 is guided to the defroster opening 21 and the foot opening 27 in the foot blowing mode in which the defroster opening 21 and the foot opening 27 are opened. By making it open, the warm air which passed the heater core 13 can be supplied to the upstream of the defroster opening part 21 and the foot opening part 27. FIG. Thereby, the blowing temperature difference between the defroster opening 21 and the foot opening 27 can be reduced.

  Further, the foot door 28 has a groove portion 30 so that hot air flowing through the groove portion 30 is guided to the defroster opening portion 21 and the foot opening portion 27 in the foot defroster blowing mode in which the defroster opening portion 21 and the foot opening portion 27 are opened. The hot air that has passed through the heater core 13 can be supplied to the upstream side of the defroster opening 21 and the foot opening 27. Thereby, the blowing temperature difference between the defroster opening 21 and the foot opening 27 can be reduced.

(Other embodiments)
In the above embodiment, the foot door 28 is formed as a rotary door type. However, the present invention is not limited to this, and the foot door 28 may be formed as a sliding door that slides on the root side of the groove portion 30.

  In the above embodiment, the operation of each control door has been described as being driven by an actuator such as a servo motor via a link mechanism. However, manual operation such as a temperature control lever and a blow mode switching lever provided on the air conditioning operation panel has been described. You may make it operate each said control door via an operation cable etc. with the manual operation force added to an operation member.

  Further, although the user manually operates the blow mode switching lever by using the control lever to drive the blow mode switching means, it can also be applied to an air conditioner equipped with an auto air conditioner that automatically controls the blow mode switching means. Is.

  Of course, the present invention can be similarly applied to an air conditioner of a type in which the evaporator (cooling heat exchanger) 12 is not provided in the air conditioning unit 10 and a reheat type vehicle air conditioner.

It is a longitudinal section showing the whole air conditioning unit 10 composition of a vehicle air conditioner in one embodiment of the present invention. It is AA sectional drawing shown in FIG. It is a perspective view which shows the external appearance shape of the foot door 28 in one Embodiment of this invention. It is a longitudinal cross-sectional view which shows the operation form (bilevel blowing mode) in the other blowing mode of FIG. It is a longitudinal cross-sectional view which shows the action | operation form (foot blowing mode) in the other blowing mode of FIG. It is a longitudinal cross-sectional view which shows the operation | movement form (foot defroster blowing mode) in the other blowing mode of 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 19 ... Warm air passage 20 ... Air mixing part 21 ... Defroster opening part, opening part 24 ... Face opening part, opening part 27 ... Foot opening part, opening part 28 ... Foot door, control door (Foot switching door)
30 ... Groove

Claims (6)

An air conditioning case (11) forming an air passage;
A heating heat exchanger (13) installed in the air conditioning case (11) for heating air;
A hot air passage (19) through which the hot air passes through the heating heat exchanger (13);
A cold air bypass passage (15) through which the cold air flows, bypassing the heating heat exchanger (13),
An air mix door (16) for adjusting the air volume ratio between the hot air passing through the hot air passage (19) and the cold air passing through the cold air bypass passage (15);
An air mixing section (20) for mixing hot air passing through the hot air passage (19) and cold air passing through the cold air bypass passage (15);
A defroster opening (21) formed on the downstream side of the air mixing section (20) and connected to a defroster outlet for blowing conditioned air to the front window glass of the vehicle;
A face opening (24) formed on the downstream side of the air mixing part (20) and connected to a face outlet for blowing out conditioned air toward the upper body of the passenger in the passenger compartment;
A foot opening (27) formed on a side wall of the air conditioning case (11) on the downstream side of the air mixing unit (20) and connected to a foot outlet that blows air conditioned air toward the feet of the passengers in the passenger compartment. Prepared,
On the side wall of the air conditioning case (11) on the downstream side of the heat exchanger for heating (13), a concave groove (30) extending toward each opening (21, 24, 27) is provided, and the air conditioning A vehicle air conditioner characterized in that a hot air passage is formed by covering the groove (30) with a movable plate (28) sliding along a side wall of the case (11).   The groove (30) is integrally formed so that at least the side walls of the air conditioning case (11) of the warm air passage (19) and the air mixing unit (20) bulge outward. The vehicle air conditioner according to claim 1.   The vehicle air conditioner according to claim 1 or 2, wherein the movable plate (28) is a foot switching door (28) for opening and closing the foot opening (27).   When the movable plate (28) is in a bi-level blowing mode in which the face opening (24) and the foot opening (27) open, the warm air flowing through the groove (30) 24. The vehicle air conditioner according to claim 3, wherein the groove (30) is opened so as to be led to 24 and the foot opening (27).   When the movable plate (28) is in the foot blowing mode in which the defroster opening (21) and the foot opening (27) are open, the warm air flowing through the groove (30) is the defroster opening (21). And the groove opening (30) so as to be led to the foot opening (27).   When the movable plate (28) is in a foot defroster blowing mode in which the defroster opening (21) and the foot opening (27) are open, the warm air flowing through the groove (30) is The vehicle air conditioner according to claim 3, wherein the groove (30) is opened so as to be led to the foot opening (27) and the foot opening (27).

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