JP3903786B2 - Air conditioner for vehicles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle air conditioner including a hot water heating heat exchanger for heating air.
[0002]
[Prior art]
Conventionally, in a vehicle air conditioner, a hot water circuit of a hot water heating heat exchanger is provided with a hot water valve, and at the time of maximum cooling, the hot water valve is fully closed to shut off the hot water flow to the heating heat exchanger, The temperature of the cold air is prevented from rising due to the radiant heat from the heat exchanger for heating.
[0003]
In recent years, however, a hot water valve which has been abolished for cost reduction has been put into practical use. If the hot water valve is abolished, hot water continues to flow through the heating heat exchanger even during maximum cooling, and measures to prevent an increase in cold air temperature due to radiant heat from the heating heat exchanger are required.
[0004]
One countermeasure is disclosed in Japanese Utility Model Publication No. 62-17290. As shown in FIG. 7, this prior art air mixes the air volume ratio between the hot air passing through the hot water heating heat exchanger 15 and the cold air passing through the cold air bypass passage 17 of the hot water heating heat exchanger 15. In a vehicle air conditioner that adjusts the temperature of the air blown into the passenger compartment by adjusting the opening of the door 18, an auxiliary door 18b is provided integrally with the air mix door 18, and the air mix door 18 and the auxiliary door 18b are connected to a rotating shaft. It is made to rotate integrally about 18a.
[0005]
When the air mix door 18 is at the maximum cooling position (two-dot chain line position) where the ventilation passage of the heating heat exchanger 15 is fully closed and the cold air bypass passage 17 is fully opened, the downstream side of the heating heat exchanger 15 is located. By fully closing the outlet of the hot air passage 20a by the auxiliary door 18b, hot air heated by the radiant heat of the heating heat exchanger 15 is prevented from being mixed into the cold air of the cold air bypass passage 17.
[0006]
[Problems to be solved by the invention]
However, in the above prior art, since the auxiliary door 18b is provided integrally with the air mix door 18, the passage area of the hot air passage 20a downstream of the heating heat exchanger 15 is interlocked with the opening change of the air mix door 18. Will change. For this reason, in the small opening range near the maximum cooling position where the opening degree of the air mix door 18 is 0%, the passage area of the hot air passage 20a is narrowed by the auxiliary door 18b, and the amount of hot air is reduced. The blown air temperature does not rise to a temperature commensurate with the increase in the opening of the door 18, and the control characteristic of the blown air temperature is deteriorated.
[0007]
That is, FIG. 8 shows the relationship between the change in the opening degree of the air mix door 18 and the temperature of the air blown into the passenger compartment. The control characteristic of the blown air temperature becomes convex downward, and in the small opening range near the maximum cooling position where the opening = 0%, the increase in the blown air temperature is small with respect to the increase in the opening of the air mix door 18 It becomes. On the other hand, in the large opening range near the maximum heating position where the opening degree = 100%, the blown air temperature suddenly changes with respect to the opening change of the air mix door 18.
[0008]
As described above, since the variation range of the blown air temperature with respect to the change in the opening varies greatly between the small opening range and the large opening range of the air mix door 18, the blowing air temperature cannot be stably controlled, and the control characteristics thereof are Getting worse.
[0009]
Further, in the above prior art, the air mix door 18 and the auxiliary door 18b rotate around the rotary shaft 18a located between the doors 1 and 18b, so that the doors 18 and 18b constitute a butterfly door. . For this reason, at the maximum cooling position and maximum heating position of the air mix door 18, the wind pressure applied to the auxiliary door 18b acts in a direction that weakens the pressure-bonded state between the air mix door 18 and the case-side seal surface. As a result, the hot air blocking action of the air mix door 18 at the maximum cooling position and the cold air blocking action of the air mix door 18 at the maximum heating position are likely to be incomplete, causing a deterioration in the maximum cooling capacity and the maximum heating capacity.
[0010]
In view of the above points, the present invention provides a vehicle air conditioner in which warm water continues to flow through the heating heat exchanger even during maximum cooling due to the elimination of the hot water valve. It aims at suppressing, without requiring the auxiliary door integral with a mix door.
[0011]
[Means for Solving the Problems]
  In order to achieve the above object, according to the first aspect of the present invention, a case (11) in which air flows toward the passenger compartment and a heating heat that is provided in the case (11) and heats the air using hot water as a heat source. A heat exchanger (15), warm air passing through the heating heat exchanger (15) provided in the case (11) upstream of the heating heat exchanger (15), and a heating heat exchanger ( 15) The air mix door (18) that adjusts the air volume ratio with the cold air that flows by bypassing to adjust the temperature of the air blown into the vehicle interior, and at least the air that has been temperature adjusted by the air mix door (18) A blow mode switching unit (22) for switching and distributing to a plurality of blow openings (24 to 26) including an opening (25) and a foot opening (24);
  When the air mix door (18) is operated to the maximum cooling position that fully closes the ventilation path of the heating heat exchanger (15), the hot water circulates in the heating heat exchanger (15). ,
  The blowing mode switching unit (22) is provided with a rotary door (27) that opens and closes a plurality of blowing openings (24 to 26) by rotational displacement of a circumferential wall surface (27a) that rotates about the rotation axis (28). ,
  The rotating shaft (28) is disposed at the outlet of the warm air passage (20a) formed on the downstream side of the heating heat exchanger (15),
  When the face mode in which the face opening (25) is opened by the rotary door (27) is selected and the air mix door (18) is operated to the maximum cooling position, the radiant heat of the heating heat exchanger (15) The rotary door (27) includes a guide member (29) that suppresses the hot air heated by the air from rising toward the cold air.In addition, the guide member (29) is arranged in the vicinity of the rotation shaft (28).It is characterized by that.
[0012]
Thus, in the vehicle air conditioner in which hot water circulates in the heating heat exchanger (15) even during maximum cooling, the guide member provided in the rotary door (27) with a decrease in the maximum cooling capacity due to the radiant heat of the heating heat exchanger. (29).
[0013]
As a result, the auxiliary door integrated with the air mix door in the prior art can be eliminated, and the opening of the air mix door (18) is changed in each blowing mode selected by the rotary door (27). Regardless, it is held at a certain position and the passage area of the warm air is kept constant. Therefore, as shown by the solid line in FIG. 8, the blown air temperature can be proportionally increased to a temperature commensurate with the increase in the opening of the air mix door 18, and good control characteristics of the blown air temperature can be secured.
[0014]
Further, since the auxiliary door integrated with the air mix door (18) can be eliminated, it is not necessary to configure the air mix door (18) as a butterfly door, and seal failure during maximum cooling and maximum heating can be avoided.
[0015]
In invention of Claim 2, when face mode is selected by rotary door (27) in Claim 1, the front-end | tip part of a guide member (29) is the upper end part vicinity of the heat exchanger for heating (15) It is characterized by suppressing an increase in hot air in the vicinity.
[0016]
Thereby, a raise of a hot air can be suppressed by the cooperative action with the upper end part vicinity part of a guide member (29) and the heat exchanger for heating (15).
[0017]
In invention of Claim 3, in Claim 2, it is inclined so that the front-end | tip part by the side of the heat exchanger for heating (15) among the guide members (29) may go diagonally upward from a horizontal surface, It is characterized by the above-mentioned. To do.
[0018]
Thereby, the hot air which rose to the lower surface part of the guide member (29) can be reliably retained between the front-end | tip part of a guide member (29) and the upper end part vicinity part of the heat exchanger for heating (15).
[0019]
As in the fourth aspect of the present invention, in any one of the first to third aspects, the rotary door (27) is specifically configured so that both ends in the axial direction of the circumferential wall surface (27a) are connected to the rotating shaft ( 28), and the guide member (29) is formed in a plate shape extending in the axial direction of the circumferential wall surface (27a) inside the two side plate portions (27b). You may do it.
[0021]
In addition, the code | symbol in the bracket | parenthesis of each said means shows the correspondence with the specific means as described in embodiment mentioned later.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
1 to 3 are schematic cross-sectional views of an air conditioning unit 10 in an indoor unit of the vehicle air conditioner according to the first embodiment. The air conditioning unit 10 is an instrument panel (not shown) in the front of the vehicle interior. On the inner side, it is arranged at a substantially central portion in the vehicle width (left and right) direction. At that time, the air conditioning unit 10 is mounted as shown by arrows in FIGS. 1 shows the face mode, FIG. 2 shows the foot mode, and FIG. 3 shows the defroster mode.
[0023]
Of the indoor unit units, a blower unit (not shown) that blows air to the air conditioning unit unit 10 is offset from the air conditioning unit unit 10 to the passenger seat side inside the instrument panel. This blower unit may have a well-known configuration, and an internal / external air switching unit that switches between internal air (vehicle interior air) and external air (vehicle outdoor air) and introduces air introduced from the internal / external air switching unit to the air conditioning unit unit 10. And a blower unit for blowing air. This blower unit is provided with a centrifugal blower fan.
[0024]
The air conditioning unit 10 has a resin case 11, which has a vertically long shape, and forms an air passage through which blown air flows from the lower side to the upper side. An air inlet space 12 into which the air blown from the blower unit flows is formed in the lowermost part inside the case 11.
[0025]
A heat exchanger section 13 is disposed above the air inlet space 12. The heat exchanger unit 13 includes an evaporator 14 that forms a cooling heat exchanger and a heater core 15 that forms a heating heat exchanger. The evaporator 14 is disposed immediately above the air inlet space 12. 15 is disposed further above the evaporator 14.
[0026]
As shown in FIGS. 1 to 3, the evaporator 14 is disposed substantially horizontally at a position above the bottom surface of the case 11 by a predetermined height. However, the evaporator 14 is not strictly horizontal, but is inclined obliquely downward from the horizontal plane toward the vehicle front side by a predetermined inclination angle (for example, about 20 °).
[0027]
Thus, by arranging the evaporator 14 in an inclined manner, the size of the case 11 in the vehicle front-rear direction can be reduced. Furthermore, the inclined arrangement of the evaporator 14 allows the condensed water generated in the evaporator 14 to be collected at the inclined lower end portion on the vehicle front side, and the condensed water can be smoothly discharged downward from the inclined lower end portion. In the case 11, a bottom surface portion located below the evaporator 14 constitutes a condensed water receiving portion, and a condensed water discharge port 16 is opened at the bottom of the vehicle front side.
[0028]
In addition, as is well known, the evaporator 14 is supplied with low-pressure refrigerant decompressed by a decompression means (not shown) of an air-conditioning refrigeration cycle, and the low-pressure refrigerant absorbs heat from the blown air and evaporates. Is supposed to cool.
[0029]
As is well known, the evaporator 14 has a configuration in which a heat exchange core portion 14c is disposed between the tank portions 14a and 14b. The heat exchange core portion 14c includes a plurality of flat tubes (not shown) and a plurality of flat tubes (not shown). This is a configuration in which corrugated heat transfer fins (not shown) are alternately stacked in parallel and joined. The air that has flowed into the air inlet space 12 passes through the heat exchange core portion 14c of the evaporator 14 from below to above as indicated by an arrow a.
[0030]
In the case 11, the heater core 15 is disposed on the downstream side of the air flow of the evaporator 14, that is, on the upper side of the evaporator 14 and at an intermediate portion in the vehicle longitudinal direction. More specifically, the heater core 15 is vertically arranged so that the surface of the heat exchange core portion 15c of the heater core 15 faces in a substantially vertical direction.
[0031]
The heater core 15 is a hot-water heating heat exchanger that heats air using hot water (cooling water) from a vehicle engine (not shown) as a heat source, and the heater core 15 is disposed on the lower side facing each other at a predetermined interval. The heat exchange core 15c is arranged between the hot water inlet tank 15a and the upper hot water outlet tank 15b. The heat exchange core 15c includes a plurality of flat tubes (not shown) and a plurality of flat tubes (not shown). This is a configuration in which corrugated heat transfer fins (not shown) are alternately stacked in parallel and joined.
[0032]
The heater core 15 is a so-called all-pass type (one-way flow type) heater core, and warm water is supplied from the hot water inlet tank portion 15a through all of the plurality of flat tubes toward the hot water outlet tank portion 15b. It is configured to flow in the direction.
[0033]
As described above, the heater core 15 is disposed above the evaporator 14 and at an intermediate portion in the vehicle front-rear direction, so that the heater core 15 is bypassed to a portion closer to the vehicle front side than the heater core 15 to cool air. Is formed as shown by the arrow b. In addition, a rotating shaft 18 a of the air mix door 18 is disposed at a vehicle front side portion of the upper end portion of the heater core 15.
[0034]
The rotating shaft 18a is arranged so as to extend in the direction perpendicular to the paper surface (vehicle width direction) in FIG. 1, and both ends of the rotating shaft 18a are rotatably held by bearing holes (not shown) on the wall surface of the case 11. The upper end of a plate-shaped air mix door 18 is integrally connected to the rotary shaft 18a, and the air mix door 18 can rotate between the solid line position and the two-dot chain line position in FIG. 1 about the rotary shaft 18a. ing.
[0035]
Here, the solid line position of the air mix door 18 is the maximum cooling position where the ventilation path of the heat exchange core portion 15 c of the heater core 15 is fully closed, and the two-dot chain line position is the maximum heating position where the cooling air bypass passage 17 is fully closed. is there. When the air mix door 18 opens the ventilation path of the heat exchange core portion 15 c of the heater core 15, the air after passing through the evaporator 14 passes through the heat exchange core portion 15 c and flows upward of the heater core 15 as indicated by an arrow c.
[0036]
The air mix door 18 adjusts the air volume ratio between the warm air (arrow c) passing through the heat exchange core portion 15c of the heater core 15 and the cold air (arrow b) bypassing the heater core 15 and passing through the cold air bypass passage 17 as is well known. Thus, the temperature adjusting means adjusts the temperature of the air blown into the passenger compartment.
[0037]
The hot water circulation circuit to the heater core 15 is provided with a hot water pump (not shown) that is rotationally driven by a vehicle engine that is a hot water supply source, and no hot water valve for controlling the hot water flow is provided. For this reason, hot water is constantly circulated to the heater core 15 by operation of the hot water pump during operation of the vehicle engine. That is, even when the air mix door 18 is operated to the maximum cooling position that fully closes the ventilation path of the heat exchange core portion 15 c of the heater core 15, the hot water circulates to the heater core 15.
[0038]
An air mixing portion 19 is formed above the heater core 15 in the case 11, and a hot air passage 20 a partitioned by a hot air guide wall 20 in the vehicle rear side portion of the heater core 15 in the case 11 is directed upward. It is formed to extend.
[0039]
The hot air guide wall 20 is disposed in the space in the case 11 so as to protrude in a curved shape from the lower end of the heater core 15 toward the upper side. The warm air guide wall 20 guides the warm air in the warm air passage 20a toward the air mixing section 19 as indicated by an arrow c.
[0040]
Further, in the case 11, a cold air guide wall 21 is formed on the upper portion of the cold air bypass passage 17 so as to protrude in a curved shape into the space in the case in a substantially horizontal direction. The cold air guide wall 21 guides the cold air toward the air mixing unit 19 as indicated by an arrow b. In the air mixing unit 19, the hot air and the cold air are mixed, and air having a desired temperature is obtained by mixing the cold air.
[0041]
The blowing mode switching unit 22 is arranged on the upper side (downstream side of the air flow) of the air mixing unit 19, that is, on the upper surface of the case 11. The blowing mode switching unit 22 has a semi-cylindrical opening seal surface 23 formed on the upper surface of the case 11 such that its circumferential surface extends in the vehicle front-rear direction. Of the opening seal surface 23, a foot opening 24 is opened at a site on the vehicle rear side, and a face opening 25 is arranged at a site on the vehicle front side relative to the opening position of the foot opening 24. Further, a defroster opening 26 is arranged at a position ahead of the vehicle 25.
[0042]
The foot opening 24 communicates with the foot outlet 24b via a foot outlet passage 24a formed on the surface of the case 11 on the vehicle rear side. The foot outlets 24b are opened on both the left and right sides of the case 11 in the vehicle width direction, and air is blown out from here toward the feet of the occupants. The face opening 25 blows out air toward the occupant's face through a face duct (not shown). The defroster opening 26 blows out air toward the inner surface of the vehicle front window glass through a defroster duct (not shown).
[0043]
A blowout mode switching rotary door 27 is disposed on the inner side of the semi-cylindrical opening seal surface 23 so as to be rotatable in the vehicle front-rear direction by a rotary shaft 28. The rotary door 27 is provided with a circumferential wall surface 27a having a predetermined radius of curvature with the rotary shaft 28 as the center. Thus, the rotation shaft 28 is connected.
[0044]
Here, the rotation shaft 28 is formed so as to protrude from the two side plate portions 27 b to the left and right outer sides in the vehicle width direction, and is rotatably supported by bearing holes (not shown) in the side wall portion of the case 11. And the guide member 29 is arrange | positioned in the rotation shaft 28 vicinity in the inner side area | region of the vehicle width direction of the two side-plate parts 27b.
[0045]
The guide member 29 is a guide member for preventing a rise in the cool air temperature during maximum cooling, and has a rectangular plate shape extending in the vehicle width direction (axial direction) between the left and right side plate portions 27b. The left and right end portions of the guide member 29 are integrally connected to the inner side surfaces of the left and right side plate portions 27b. The plate shape of the guide member 29 is not limited to the illustrated flat plate shape, and may be a shape having a bent portion.
[0046]
When the rotary door 27 is operated to the face mode position of FIG. 1, the guide member 29 is inclined at a minute angle so that the tip of the heater core 15 side (the vehicle front side) is obliquely upward with respect to the horizontal plane. The distal end portion of the guide member 29 is positioned in the vicinity of the upper end portion of the heater core 15. More specifically, the tip end portion of the guide member 29 comes into contact with or close to the support wall 30 of the case 11 to which the upper end portion of the heater core 15 is fitted.
[0047]
The surface of the guide member 29 in the vehicle front-rear direction is inclined so that the front end portion on the heater core 15 side (the vehicle front side) faces obliquely upward as described above, and is a surface that faces obliquely below the front end portion of the cold air guide wall 21. It is almost parallel to. A warm air gap 31 is formed in the vehicle rear side portion of the guide member 29 in which the warm air from the warm air passage 20a downstream of the heater core 15 flows in the face mode.
[0048]
The circumferential wall surface 27a, the side plate portion 27b, the rotating shaft 28, and the guide member 29 of the rotary door 27 are integrally formed of resin.
[0049]
The rotating shaft 28 is disposed in the vicinity of the outlet portion of the warm air passage 20a, and is adjacent to the vicinity of the upper end portion of the heater core 15, more specifically, the vehicle rear side portion of the upper end portion. Therefore, the rotating shaft 28 is disposed below the tip of the cold air guide wall 21. As a result, of the two side plate portions 27b, the portion 27c adjacent to the rotating shaft 28 is located between the tip portions of the guide walls 20 and 21.
[0050]
In order to avoid this portion 27c from interfering with the tip portions of the guide walls 20 and 21, the width of the portion 27c in the vehicle front-rear direction is narrowed to the same size as the outer diameter of the rotary shaft 28. And the part adjacent to the circumferential wall surface 27a among the side-plate parts 27b is substantially fan shape.
[0051]
A film member 27e made of a resin thin film material is mounted on the outer peripheral side of the circumferential wall surface 27a via an elastic material 27d, and this film member 27e rotates integrally with the circumferential wall surface 27a. . The film member 27e is applied with wind pressure inside the rotary door 27 through an opening (not shown) provided on the circumferential wall 27a and an opening (not shown) between the elastic members 27d. Therefore, the film member 27e is pressure-bonded to the inner peripheral surface of the opening seal surface 23 on the case 11 side by the wind pressure and the elastic pressing force of the elastic material 27d, thereby reliably closing the outlet openings 24, 25, and 26. ing.
[0052]
In addition, a communication hole 27f that penetrates these members 27a, 27d, and 27e is provided at a circumferential intermediate portion of the circumferential wall surface 27a, the elastic member 27d, and the film member 27e. The respective openings 24 to 26 are opened and closed.
[0053]
A semi-cylindrical door rotation space 32 that allows the rotary door 27 to rotate is formed inside the semi-cylindrical opening seal surface 23 on the upper surface of the case 11. The door rotation space 32 is formed from the vehicle rear side portion of the hot air guide wall 20 to the upper portion of the cold air guide wall 21.
[0054]
The rotary shaft 28 of the rotary door 27 protrudes outside the case 11 and is connected to a blow mode operation mechanism via a link mechanism (not shown), and the rotary door 27 is rotated by this blow mode operation mechanism. Similarly, the rotary shaft 18a of the air mix door 18 is also connected to the temperature adjustment operation mechanism via a link mechanism outside the case 11, and the air mix door 18 is rotated by this temperature adjustment operation mechanism.
[0055]
These blow-out mode operation mechanism and temperature adjustment operation mechanism are configured by an automatic operation mechanism using a servo motor, but may be a manual operation mechanism that is directly operated by a manual operation force of an occupant.
[0056]
Next, based on the said structure, the action | operation of this embodiment is demonstrated easily. When a blower of a blower unit (not shown) is operated, the inside air or the outside air is sucked from an inside / outside air switching unit (not shown), and this sucked air is blown by the blower to enter the lowermost air inlet space 12 in the case 11 of the air conditioning unit 10. Inflow.
[0057]
Then, it passes through the evaporator 14 from the lower side to the upper side as shown by the arrow a and is cooled to become cold air. The cold air is then divided into cold air b passing through the cold air bypass passage 17 and warm air c passing through the heater core 15 and flowing through the hot air passage 20a according to the opening of the air mix door 18, and the hot air c is warm. The air is guided by the wind guide wall 20 and guided from the warm air passage 20a to the air mixing unit 19. The cold air b is guided by the cold air guide wall 21 and guided to the air mixing unit 19.
[0058]
In the air mixing unit 19, the hot air c and the cold air b are mixed to become air of a predetermined temperature. Therefore, the temperature of the air mixed in the vicinity of the air mixing unit 19 can be adjusted to a desired temperature by adjusting the air volume ratio of the cool air b and the warm air c according to the opening of the air mix door 18.
[0059]
Then, by operating the blowing mode switching rotary door 27 and selecting the opening / closing of the foot opening 24, the face opening 25, and the defroster opening 26, the vehicle can be opened from a predetermined opening or a plurality of openings. Air can be blown into the room.
[0060]
That is, FIG. 1 shows a state of the face mode. The face opening 25 is opened by the communication hole 27f of the rotary door 27, and the foot opening 24 and the defroster opening are formed by the film member 27e on the circumferential wall surface 27a of the rotary door 27. 26 is closed.
[0061]
Since the face mode is a blowing mode mainly used during cooling in summer, the air mix door 18 is operated from the maximum cooling position where the opening degree = 0% to the small opening area, and cold air is blown from the face opening 25. Blow out. Here, since the warm water valve for controlling the warm water flow is not installed in the warm water circulation circuit to the heater core 15, the warm water circulates to the heater core 15 even when the air mix door 18 is operated to the maximum cooling position.
[0062]
Thus, when hot water circulates to the heater core 15 even during maximum cooling, the air around the heater core 15 rises in temperature due to the radiant heat of the heater core 15. As a result, the maximum cooling capacity decreases. However, according to the first embodiment, when the hot air whose temperature has risen due to the radiant heat of the heater core 15 rises by natural convection on the downstream side of the heater core 15, the upward flow of the hot air is blocked by the guide member 29 of the rotary door 27.
[0063]
That is, when the rotary door 27 is in the face mode, the leading end portion of the guide member 29 on the heater core 15 side (vehicle front side) is located near the upper end portion of the heater core 15 and can block the upward flow of hot air. In addition, since the guide member 29 is inclined at a very small angle so that the tip of the heater core 15 (vehicle front side) is inclined upward with respect to the horizontal plane, the effect of preventing hot air from being mixed into the cold air is high. .
[0064]
That is, contrary to the first embodiment, the guide member 29 is provided, and the lower surface of the guide member 29 is arranged so that the tip of the side opposite to the heater core 15 (the vehicle rear side) is inclined obliquely upward with respect to the horizontal plane. The hot air that has risen up to the portion easily passes through the warm air gap 31 side along the inclination of the guide member 29 and is easily mixed into the cold air. However, in the first embodiment, the hot air that has risen up to the lower surface portion of the guide member 29 Moves to the upper end of the heater core 15 along the inclination of the guide member 29 and is held near the upper end of the heater core 15. Therefore, the effect of preventing hot air from mixing into the cold air can be enhanced.
[0065]
Further, when the guide member 29 is tilted and arranged so that the front end portion on the heater core 15 side (vehicle front side) is obliquely upward as described above, the vehicle front-rear direction surface of the guide member 29 is the front end portion of the cold air guide wall 21 Since it is substantially parallel to the surface directed obliquely downward, the main flow of the cold air from the cold air bypass passage 17 can flow smoothly along the cold air guide wall 21 and the guide member 29 during the maximum cooling. Therefore, the maximum air volume at the maximum cooling can be ensured satisfactorily.
[0066]
As described above, even in a low-cost air conditioner in which no hot water valve is installed in the hot water circuit of the heater core 15, the maximum cooling capacity can be ensured satisfactorily.
[0067]
On the other hand, when the air mix door 18 is operated from the maximum cooling position where the opening degree is 0% to the small opening area in the face mode, the warm air heated through the heater core 15 passes through the hot air gap 31. By passing and mixing with cold air, the temperature of the air blown into the passenger compartment in the face mode can be adjusted.
[0068]
Next, FIG. 2 shows a state in the foot mode. The foot opening 24 is opened by the communication hole 27f, and the face opening 25 and the defroster opening 26 are formed by the film member 27e on the circumferential wall surface 27a of the rotary door 27. Blocked.
[0069]
In this foot mode, the distal end portion of the guide member 29 is separated from the position near the upper end portion of the heater core 15 with the rotational displacement of the rotary door 27, and therefore between the distal end portion of the guide member 29 and the upper end portion of the heater core 15. A hot air gap 31a is formed. Accordingly, the foot mode is adjusted by adjusting the air volume ratio between the hot air passing through the both hot air gaps 31 and 31 a before and after the guide member 29 and the cold air in the cold air bypass passage 17 by the opening degree of the air mix door 18. The temperature of the air blown into the passenger compartment can be adjusted.
[0070]
Next, FIG. 3 shows a state in the defroster mode, in which the rotary door 27 is rotated counterclockwise to the maximum. In this case, the circumferential wall surface 27 a of the rotary door 27 rotates to a position that does not face the defroster opening 26, so that the defroster opening 26 is in an open state, and the foot opening 24 and the face opening 25 are formed on the rotary door 27. It is closed by a film member 27e on the circumferential wall surface 27a.
[0071]
Even in the defroster mode, by adjusting the air volume ratio between the warm air passing through the both hot air gaps 31 and 31a before and after the guide member 29 and the cold air in the cold air bypass passage 17 as in the foot mode, The temperature of the air blown into the passenger compartment can be adjusted.
[0072]
By the way, since the guide member 29 is installed in the blowout mode switching rotary door 27, the hot air gap 31 in the face mode, the hot air gaps 31, 31a in the foot mode and the defroster mode. The passage area is always kept constant regardless of the opening change of the air mix door 18. In other words, the guide member 29 does not change the passage area of the hot air passage in accordance with the opening change of the air mix door 18 unlike the auxiliary door 18b of the prior art.
[0073]
From this, according to this embodiment, as shown to the continuous line of FIG. 8, the blowing air temperature can be proportionally raised to the temperature corresponding to the opening increase of the air mix door 18, and the control characteristic of the blowing air temperature Can be improved over the prior art.
[0074]
Further, since the air mix door 18 is a normal cantilever type door in which a rotating shaft 18a is disposed at one end of the plate door, the air pressure on the upstream side of the air mix door 18 at both the maximum cooling position and the maximum heating position. Acts in the direction of pressing the air mix door 18 against the sealing surface on the case side. Therefore, the deterioration of the sealing performance as in the case of the conventional butterfly door type air mix door 18 does not occur.
[0075]
In addition, although the case where the three blowing modes of the face mode, the foot mode, and the defroster mode are switched has been described with reference to FIGS. 1, 2, and 3, the bi-level that opens the foot opening 24 and the face opening 25 simultaneously The foot defroster mode that simultaneously opens the mode, the foot opening 24 and the defroster opening 26 at substantially the same opening ratio (substantially the same air volume ratio) is added as the blowing mode, and a total of five blowing modes are provided as one rotary door. 27 may be switched.
[0076]
In the foot mode of FIG. 2, the defroster opening 26 is fully closed. However, the foot opening 24 may be opened at the same time as the foot opening 24 is opened in a small amount. According to this, a small amount of conditioned air (warm air) is blown out from the defroster opening 26 during winter heating in the foot mode, and the anti-fogging performance of the vehicle window glass can be enhanced.
[0077]
(Second Embodiment)
In the first embodiment, the foot opening 24, the face opening 25, and the defroster opening 26 are all opened and closed by the rotational displacement of the circumferential wall surface 27a of the rotary door 27, but the second embodiment is shown in FIGS. As shown in FIG. 6, first and second plate door portions 27g and 27h that rotate integrally with the circumferential wall surface 27a are provided, and a foot opening is formed by combining the circumferential wall surface 27a and both the plate door portions 27g and 27h. 24, the face opening 25 and the defroster opening 26 are opened and closed.
[0078]
In the case 11, a partition wall 33 is connected to the upper end portion of the hot air guide wall 20, and a foot outlet passage 24 a is defined at a site on the vehicle rear side of the hot air guide wall 20. The partition wall 33 has a shape protruding upward in a mountain shape, and this mountain-shaped protruding shape forms the door rotation operating space 32 up to the vehicle rear side portion of the partition wall 33. Accordingly, the foot outlet passage 24 a is disposed in the inner region of the door rotation operation space 32.
[0079]
A foot opening 24 is opened near the upper portion of the partition wall 33, and a first plate door portion 27 g is disposed on the lower surface side of the foot opening 24. The first plate door portion 27g is molded integrally with the rotary door 27 with resin together with the connecting arm portion 27i. The first plate door portion 27 g extends in the axial direction of the rotary shaft 28 of the rotary door 27 and has a plate shape larger than the opening area of the foot opening 24. Two connecting arm portions 27i are integrally formed at positions near both ends of the first plate door portion 27g in the door axial direction. The two connecting arm portions 27 i extend upward in an arc shape through the foot opening 24.
[0080]
On the other hand, the second plate door portion 27h is integrally formed between the left and right side plate portions 27b located at both axial end portions of the rotary door 27. The second plate door portion 27h has the same plate shape as the first plate door portion 27g, and both the plate door portions 27g and 27h are the same from the rotary shaft 28 in the radially inner region of the circumferential wall surface 27a. It is arranged at the radial position.
[0081]
The first plate door portion 27g and the connecting arm portion 27i are molded separately from the rotary door 27 with resin or the like, and the tip ends of the two connecting arm portions 27i are fitted into the second plate door portion 27h, and screwed. You may make it fix by means, such as a stop.
[0082]
Elastic sealing materials (packing materials) 27j and 27k are provided on the upper surface side of the first plate door portion 27g and the lower surface side of the second plate door portion 27h, respectively. The elastic sealing materials 27j and 27k are fixed to the first and second plate door portions 27g by adhesion. The elastic seal members 27j and 27k may be formed of a rubber-based elastic body such as an elastomer rubber and integrally formed with the first and second plate door portions 27g and 27h.
[0083]
In the second embodiment, the circumferential length of the circumferential wall surface 27a of the rotary door 27 is made shorter than that in the first embodiment, and the communication hole 27f that penetrates the circumferential wall surface 27a in the radial direction is eliminated. .
[0084]
FIG. 4 shows the face mode according to the second embodiment. The defroster opening 26 is closed by the film member 27e of the circumferential wall surface 27a, and the foot opening 24 is closed by the elastic seal material 27j of the first plate door portion 27g. Blocked. Then, when the circumferential wall surface 27a of the rotary door 27 rotates to a position where it does not face the face opening 25, the face opening 25 is in an open state.
[0085]
FIG. 5 shows the foot mode according to the second embodiment, and the rotary door 27 is rotated counterclockwise by a predetermined angle from the state of FIG. Thereby, both the face opening 25 and the defroster opening 26 are closed by the film member 27e of the circumferential wall surface 27a. Moreover, since the 1st board door part 27g moves to the downward position separated from the foot opening part 24, the foot opening part 24 will be in an open state.
[0086]
FIG. 6 shows the defroster mode according to the third embodiment, and the rotary door 27 is further rotated counterclockwise by a predetermined angle from the state of FIG. That is, FIG. 6 shows a state in which the rotary door 27 is rotated counterclockwise to the maximum. In this case, when the circumferential wall surface 27a of the rotary door 27 rotates to a position that does not face the defroster opening 26, the defroster opening 26 is in an open state. The face opening 25 is closed by the film member 27e on the circumferential wall surface 27a. And the foot opening part 24 is obstruct | occluded with the elastic sealing material 27k of the 2nd board door part 27h.
[0087]
Also in the second embodiment, a guide member 29 is provided near the rotary shaft 28 in the inner region of the rotary door 27 as in the first embodiment, and the maximum cooling capacity and good temperature control characteristics as in the first embodiment. Can be secured.
[0088]
In addition, according to the second embodiment, the circumferential wall surface 27a of the rotary door 27 shares only the opening / closing function of the face opening 25 and the defroster opening 26, so the circumferential length of the circumferential wall surface 27a of the rotary door 27 is The height can be reduced as compared with the first and second embodiments.
[0089]
Moreover, since the plate door portions 27g and 27h for opening and closing the foot opening 24 are disposed in the radially inner region of the circumferential wall surface 27a, the foot opening 24 can be disposed in the inner region of the rotation working space 32. Accordingly, the foot outlet passage 24 a can also be arranged in the inner region of the rotation working space 32.
[0090]
As a result, the size of the air conditioning unit 10 in the vehicle front-rear direction can be reduced as compared with the case where the foot outlet passage 24a is formed to protrude outside the rotation working space 32 as in the first embodiment. The vehicle mountability can be further improved.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view of an air conditioning unit of a vehicle air conditioner according to a first embodiment of the present invention, showing a face mode.
FIG. 2 is a schematic sectional view of an air conditioning unit according to the first embodiment, showing a foot mode.
FIG. 3 is a schematic cross-sectional view of an air conditioning unit according to the first embodiment, showing a defroster mode.
FIG. 4 is a schematic cross-sectional view of an air conditioning unit according to a second embodiment, showing a face mode.
FIG. 5 is a schematic cross-sectional view of an air conditioning unit according to a second embodiment, showing a foot mode.
FIG. 6 is a schematic sectional view of an air conditioning unit according to a second embodiment, showing a defroster mode.
FIG. 7 is a schematic cross-sectional view of a conventional air conditioning unit.
FIG. 8 is a temperature control characteristic diagram of air blown into the passenger compartment according to the prior art and the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... Case, 13 ... Heat exchanger part, 14 ... Evaporator (heat exchanger for cooling),
15 ... Heater core (heating heat exchanger), 17 ... Cold air bypass passage,
18 ... Air mix door, 20a ... Warm air passage, 22 ... Blowout mode switching part,
24 to 26: blowout opening, 27 ... rotary door, 27a ... circumferential wall surface, 27b ... side plate, 28 ... rotating shaft, 29 ... guide member, 32 ... door rotation space.

Claims (4)

A case (11) in which air flows into the passenger compartment;
A heating heat exchanger (15) provided in the case (11) for heating the air using hot water as a heat source;
Hot air passing through the heating heat exchanger (15) provided upstream of the heating heat exchanger (15) in the case (11), and the heating heat exchanger (15) An air mix door (18) that adjusts the air volume ratio with the cold air flowing by bypass to adjust the temperature of the air blown into the passenger compartment;
Blowing mode switching unit for switching and distributing the air whose temperature is adjusted by the air mix door (18) to a plurality of blowing openings (24 to 26) including at least a face opening (25) and a foot opening (24). 22)
The hot water circulates in the heating heat exchanger (15) even when the air mix door (18) is operated to the maximum cooling position that fully closes the ventilation path of the heating heat exchanger (15). And
The blowing mode switching unit (22) includes a rotary door (27) that opens and closes the plurality of blowing openings (24 to 26) by rotational displacement of a circumferential wall surface (27a) that rotates about the rotation axis (28). Provided,
The rotating shaft (28) is disposed at the outlet of the warm air passage (20a) formed on the downstream side of the heating heat exchanger (15),
When the face mode for opening the face opening (25) is selected by the rotary door (27) and the air mix door (18) is operated to the maximum cooling position, the heating heat exchanger The rotary door (27) is provided with a guide member (29) for suppressing the hot air heated by the radiant heat of (15) from rising toward the cold air, and the guide member (29) is attached to the rotary shaft (28). ) An air conditioner for a vehicle characterized by being arranged in the vicinity .   When the face mode is selected by the rotary door (27), the tip of the guide member (29) is close to the vicinity of the upper end of the heating heat exchanger (15), and the hot air rises. The vehicle air conditioner according to claim 1, wherein the vehicle air conditioner is suppressed.   The vehicle air conditioner according to claim 2, wherein a tip of the guide member (29) on the heating heat exchanger (15) side is inclined so as to be obliquely upward from a horizontal plane. The rotary door (27) has two side plate portions (27b) that connect both ends in the axial direction of the circumferential wall surface (27a) to the rotating shaft (28),
The vehicle according to any one of claims 1 to 3, wherein the guide member (29) is formed in a plate shape extending in the axial direction inside the two side plate portions (27b). Air conditioner.

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