JP2009227026A - Air conditioning device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce ventilation resistance of cool air while retaining hot air quantity to be sent through a hot air guide passage. <P>SOLUTION: In an air guide 24 disposed at a confluence position of a hot air passage with a cool air bypass passage in a case, two first hot air guide members 24a are disposed at the predetermined spacing, and an outer frame member 24c that forms an outer frame of the air guide 24 is disposed with the predetermined space to both sides of the hot air guide members. The first hot air guide members 24a have a hot air guide passage 24d for guiding a part of the hot air from the hot air passage toward a defroster opening part to cross cool air flow. The entire range of the first hot air guide members 24a from a hot air inlet port 24e to a hot air outlet port 24f is formed in a tunnel shape. Cool air flowing in from the cool air bypass passage 17 in a direction to cross the hot air flow flowing in the first hot air guide members 24a is made to collide to the hot air flowing in from the hot air passage 19 to be mixed at the outside of the first hot air guide members 24a. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an air mix type vehicle air conditioner that adjusts the air volume ratio between cold air and hot air to adjust the temperature of air blown into the passenger compartment.

  Conventionally, in an air-mix type vehicle air conditioner, a part of the hot air from the hot air passage is applied to the confluence portion of the hot air passage and the cold air passage in the case so that the hot air crosses the cold air flow. Some have a hot air guide passage for guiding (see, for example, Patent Documents 1 and 2).

For example, as disclosed in Patent Documents 1 and 2, the hot air guide passage has a hook shape (a groove shape with a U-shaped cross section) in which the windward side portion in the cold air flow direction is closed and the leeward side portion is open. ), Or as disclosed in Patent Document 2, a part of the hot air guide passage in the hot air flow direction has a bowl shape, and the other part has a cylindrical shape (tunnel) Or a warm air guide member of a shape).
JP 2004-237940 A JP 2007-331416 A

  In the above-described prior art, a part or the whole region of the hot air guide passage is configured by the hot air guide member having a bowl shape (U-shaped groove shape) in which the leeward side portion in the cold air flow direction is opened. When the wind flows along the warm air guide path from the warm air inlet side end toward the warm air outlet side end, a part of the warm air flowing along the warm air guide path is the warm air outlet side end. Since it leaks on the way before it reaches, the transport efficiency of hot air is poor.

  Therefore, in the above-described prior art, in order to ensure a sufficient amount of hot air transported by the hot air guide passage, the hot air guide passage is widened in consideration of the amount of hot air leakage, It is necessary to increase the cross-sectional area of the guide passage.

  However, when the passage cross-sectional area of the hot air guide passage is increased, the flow resistance of the cold air flowing so as to intersect the hot air guide passage increases, causing problems such as a decrease in the amount of cold air and an increase in noise.

  In view of the above points, an object of the present invention is to reduce the draft resistance of cold air as compared with the above-described conventional technology while ensuring the amount of hot air transported by the hot air guide passage.

  In order to achieve the above object, according to the first aspect of the present invention, the hot air passage (19) is arranged at the junction (20) of the hot air passage (19) and the cold air bypass passage (17) in the case (11). 19) A hot air guide passage (24d) for guiding a part of the hot air from 19) to a predetermined blowout opening (25) is provided, and the hot air guide passage (24d) is a hot air of the hot air guide passage (24d). The entire region from the inlet (24e) to the hot air outlet (24f) is constituted by a tunnel-shaped hot air guide member (24a) and flows in the hot air guide passage outside the hot air guide passage (24d). The cold air from the cold air bypass passage (17) flowing in the direction intersecting the flow direction of the hot air and the hot air flowing from the hot air passage (19) are mixed. Yes.

  According to this, since the entire region from the hot air inlet to the hot air outlet forms the hot air guide passage by the tunnel-like hot air guide member, it passes through the hot air guide passage over the entire area of the hot air guide passage. Hot air leakage can be prevented. Therefore, according to the present invention, when the amount of hot air transported by the hot air guide passage is the same as that of the above-described conventional technology, the passage width of the hot air guide passage can be reduced as compared with the above-described conventional technology. . The passage width of the hot air guide passage means the passage width in a direction orthogonal to both the hot air flow direction and the cold air flow direction in the hot air guide passage.

  Here, the magnitude of the cold air ventilation resistance increases as the foreshadow projection area and the resistance coefficient increase. The foreshadow projection area is the area of the outer shape of the hot air guide member when the hot air guide member is projected in the cold air flow direction on the upstream side of the cold air flow of the hot air guide member, and is parallel to the cold air flow from the cold air bypass passage. It is the area of the outer shape of the hot air guide member when the hot air guide member is viewed in any direction. The resistance coefficient is a proportional constant determined by the shape of the hot air guide member facing (facing) the cold air flow.

  Therefore, in the first aspect of the present invention, when the length of the hot air guide passage in the hot air flow direction is the same as that of the conventional technology, the passage width of the hot air guide passage is larger than that of the conventional technology. Since the foreshadow projection area of the hot air guide member can be reduced, it is possible to reduce the draft resistance of the cold air flowing outside the hot air guide passage.

  In the invention described in claim 1, specifically, as shown in claim 2, the temperature in the hot air guide passage when the hot air guide member (24a) is viewed from the cold air bypass passage (17) side. The width (41) of the warm air guide member (24a) in the direction orthogonal to the wind flow direction can be set to 5 mm or more and 20 mm or less. As a result of investigation by the inventor of the present application, in the above-described conventional technology, the width of the hot air guide passage exceeds 20 mm. Therefore, according to the invention described in claim 2, compared with the above-described conventional technology, Ventilation resistance can be reduced.

  According to the second aspect of the present invention, when the total amount of hot air transported by the hot air guide passage is the same as that in the prior art, since the passage width of the hot air guide passage is small, the hot air guide passage Since the area of the cold air and the hot air flowing outside can be increased as compared with the conventional technique, the collision area of the cold and hot air can be increased, and the mixing of the cold and hot air can be promoted.

  In the invention described in claim 3, the outer shape of the hot air guide member (24a) in the cross section in the direction perpendicular to the flow direction of the hot air in the hot air guide passage is the cold air from the cold air bypass passage (17). The shape is long in the direction parallel to the flow direction, and has a streamline shape with respect to the cold air flow from the cold air bypass passage (17).

  According to this, compared with the case where the outer shape of the hot air guide member (24a) is not streamlined, the resistance coefficient contributing to the size of the airflow resistance can be reduced, so that the airflow resistance of the cold air can be reduced. it can. In addition, as a streamline shape, the elliptical shape shown in Claim 4 and the wing | blade shape shown in Claim 5 are employable, for example.

  As for the warm air guide member (24a), the end surface of the warm air guide member (24a) at the warm air outlet (24f) is inclined toward the cold air bypass passage (17), for example, as shown in claim 6. Or, as shown in claim 7, it is possible to incline to the opposite side to the cold air bypass passage (17) side.

  Further, as shown in claim 8, a rectifying plate (24i) may be provided at the end (24h) of the hot air guide member (24a) opposite to the cold air bypass passage (17) side.

  Further, as shown in claim 9, the hot air guide member (24a) extends in a direction orthogonal to both the flow direction of the hot air from the hot air passage (19) and the flow direction of the cold air from the cold air bypass passage (17). ) Are preferably arranged in parallel at predetermined intervals.

  In addition, as shown in claim 10, the tunnel-shaped hot air guide member is a first hot air guide member (24a), and the first hot air guide member is interposed between the adjacent first hot air guide members (24a). It is preferable to provide a second hot air guide member (24b) for guiding the hot air flowing outside (24a) in a predetermined direction.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

(First embodiment)
In FIG. 1, the vehicle air conditioner in 1st Embodiment of this invention is shown. FIG. 1 is a cross-sectional view of an air conditioning unit 10 of an indoor air conditioning unit in a vehicle air conditioner. Note that the up and down and front and rear arrows in FIG. 1 indicate directions in the vehicle-mounted state of the air conditioning unit 10.

  First, the overall configuration of the indoor air conditioning unit will be described. The indoor air conditioning unit is roughly classified into an air conditioning unit 10 shown in FIG. 1 and a blower unit (not shown) that blows air to the air conditioning unit 10. The air conditioning unit 10 is disposed at a substantially central portion in the vehicle width direction inside the instrument panel (instrument panel) at the foremost part of the vehicle interior. On the other hand, the blower unit is arranged offset from the center to the passenger seat side inside the instrument panel.

  As is well known, the blower unit has an internal / external air switching box that switches between outside air (vehicle exterior air) and internal air (vehicle interior air) and directs the air sucked through the internal / external air switching box toward the vehicle interior. It has a blower that blows air.

  The air conditioning unit 10 mainly includes a case 11, an evaporator 13 as a cooling heat exchanger, a heater core 15 as a heating heat exchanger, a cold air bypass passage 17, a hot air passage 19, a first and a first Two air mix doors 21 and 22, a defroster opening 25 as a plurality of blowing openings, face openings 27 a and 27 b, foot openings 29 a and 29 b, and a grid tunnel type air guide 24 are provided. The air guide 24 is a characteristic part of the present invention.

  The case 11 forms an outer shell of the air-conditioning unit 10 and forms an air passage through which indoor blown air flows toward the vehicle interior. The case 11 is formed of a resin (for example, polypropylene) having a certain degree of elasticity and excellent in strength.

  Furthermore, the case 11 has a dividing surface in the vehicle vertical direction at a substantially central portion in the vehicle width direction, and can be divided into two divided portions on the left and right by this dividing surface. Then, the left and right two divided portions contain the evaporator 13, the heater core 15, the first and second air mix doors 21 and 22, the air guide 24, and the like, and fastening means such as metal spring clips and screws. Are joined together.

  An air inlet space 12 indicated by a two-dot chain line in FIG. 1 is formed in the frontmost portion of the case 11 in the vehicle. The air inlet space 12 is an inflow space into which air blown from the blower of the blower unit described above flows into the air conditioning unit 10.

  The evaporator 13 is arranged immediately after the air flow downstream side of the air inlet space 12. The evaporator 13 is one of the components constituting a well-known vapor compression refrigeration cycle (not shown), and evaporates the low-pressure refrigerant in the refrigeration cycle to exert an endothermic effect, thereby allowing indoor air to be blown. A cooling heat exchanger for cooling. In addition, the evaporator 13 is arrange | positioned so that the heat exchange surface (heat exchange core surface) may become a substantially up-down direction (substantially vertical direction).

  In the case 11, for the cool air such as the cooling cool air passage 16, the cool air bypass passage 17, and the auxiliary cool air passage 18, the cool air after passing through the evaporator 13 is flowed to the vehicle rear side (air flow downstream side) of the evaporator 13. The air passage is formed.

  The heating cold air passage 16 is an air passage that flows the cold air after passing through the evaporator 13 in the direction of arrow A and guides it to the heater core 15, and is formed on the vehicle rear side of the evaporator 13 and below the case 11. .

  The heater core 15 causes high-temperature engine cooling water circulating in an engine cooling water circuit (not shown) to flow into the interior, heat-exchanges the engine cooling water and the cold air that has passed through the evaporator 13, and reheats the cold air. . Further, the heater core 15 is disposed such that the upper side of the heat exchange surface is inclined to the vehicle front side (air flow upstream side) rather than the lower side.

  In the case 11, on the downstream side of the air flow of the heater core 15, there is a hot air passage 19 that causes the warm air that has passed through the heater core 15 to flow in the direction of arrow B and that leads to the air mix region 20 indicated by a two-dot chain line in FIG. Is formed. The warm air passage 19 is formed in a shape extending from the lower side toward the upper side.

  The air mix region 20 is a confluence portion of the hot air passage 19 and the cold air bypass passage 17 in the case 11, and a mixing space that mixes the hot air that has passed through the hot air passage 19 and the cold air that has passed through the cold air bypass passage 17. It is. The air mix region 20 is disposed above the heater core 15 and the warm air passage 19.

  The cold air bypass passage 17 is an air passage that causes the cold air after passing through the evaporator 13 to flow in the direction from the front to the rear of the vehicle, for example, in the direction of arrow C so as to bypass the heater core 15 and to flow into the air mix region 20. is there. In the case 11, the cold air bypass passage 17 is formed on the vehicle rear side of the evaporator 13, on the upper side of the heater core 15, and further on the vehicle front side of the air mix region 20. In FIG. 1, the flow direction of the cool air flowing into the air mix region 20 is schematically indicated by an arrow C. However, the flow direction of the cool air flowing into the air mix region 20 is indicated by the opening of the first air mix door 21. It changes with the degree.

  Moreover, the cold air passage 16 for heating and the cold air bypass passage 17 are partitioned by a first partition wall 11a formed so as to extend in the left-right direction (the vertical direction in FIG. 1) in the case. The first partition wall 11 a also functions as a support fixing member that supports and fixes the upper end side of the heater core 15.

  The auxiliary cold air passage 18 is an air passage provided to make the air blown into the vehicle interior at the maximum cooling time, and is formed on the vehicle rear side of the evaporator 13 and above the cold air bypass passage 17. Has been. The cold air bypass passage 17 and the auxiliary cold air passage 18 are partitioned by a second partition wall 11b formed in the case so as to extend in the left-right direction.

  The first and second air mix doors 21 and 22 are arranged in the case 11 and adjust 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 17. In the embodiment, a so-called butterfly door is used.

  The first air mix door 21 changes only the ventilation area of the cold air bypass passage 17 and is arranged in the cold air bypass passage 17. The 1st air mix door 21 is the structure by which the 1st rotating shaft 21b was provided in the center part side of the flat 1st door main-body part 21a. The second air mix door 22 changes only the ventilation area of the cooling cold air passage 16 and is disposed in the heating cold air passage 16. The second air mix door 22 includes a second door main body portion 22a and a second rotating shaft 22b similar to the first air mix door 21.

  In addition, an auxiliary cold air passage opening / closing door 23 that opens and closes the auxiliary cold air passage 18 is disposed in the auxiliary cold air passage 18. The auxiliary cold air passage opening / closing door 23 is also configured by a butterfly door similar to the first and second air mix doors 21 and 22.

  In the present embodiment, the first and second air mix doors 21 and 22 and the auxiliary cool air passage opening / closing door 23 are connected to a servo motor for driving the air mix door (not shown) via a link mechanism (not shown). It is rotated by interlocking with the servo motor. The operation of the servo motor for driving the air mix door is controlled by a control signal output from an air conditioning control device (not shown).

  Specifically, the opening degree of the first air mix door 21 is the opening degree that makes the cold air bypass passage 17 the maximum ventilation area from the opening degree of the cold air bypass passage 17 (the position of the broken line in FIG. 1) (solid line in FIG. 1). As the position of the second air mix door 22 is displaced in the direction of arrow D, the opening of the second air mix door 22 closes the heating cool air passage 16 from the maximum ventilation area (the position indicated by the broken line in FIG. 1). Displacement in the direction of arrow E to the degree of opening (degree of solid line position in FIG. 1).

  Thereby, the air volume ratio (mixing ratio) of the cool air (arrow C) and the warm air (arrow B) flowing into the air mix area 20 is adjusted, and the temperature of the conditioned air blown from the air mix area 20 into the vehicle interior is adjusted. Adjusted. The auxiliary cold air passage opening / closing door 23 opens the auxiliary cold air passage 18 only when the opening degree of the first air mix door 21 reaches an opening degree that makes the cold air bypass passage 17 the maximum ventilation area (the position of the solid line in FIG. 1). ), When the opening degree of the first air mix door 21 is other opening degree, it is displaced to a position (broken line position in FIG. 1) where the auxiliary cold air passage 18 is closed.

  In the present embodiment, the air guide 24 is disposed in a portion of the case 11 where the air mix region 20 is formed. The air guide 24 includes a tunnel-shaped first hot air guide member 24a and a second hot air guide member 24b. Details of the air guide 24 will be described later.

  A defroster opening 25 is provided on the upper surface portion of the air conditioning case 11 and substantially above the air mix region 20. The defroster opening 25 is connected to a defroster outlet disposed in the vehicle compartment via a defroster duct (not shown), and conditioned air is blown out from the defroster outlet toward the inner surface of the vehicle window glass.

  In the rearmost part of the air conditioning case 11, a face passage 26 extending from the upper side to the lower side is formed on the rear side of the defroster opening 25, and the face passage 26 has a rear side of the defroster opening 25. Is provided with a front-seat-side face opening 27 a, and a rear-seat-side face opening 27 b is provided at the most downstream part of the face passage 26.

  The front seat side and the rear seat side face openings 27a and 27b are connected to the front seat side and the rear seat side face outlets arranged in the vehicle interior via the front seat side and the rear seat side face duct (not shown), respectively. Air-conditioning air is blown out from these front seat and rear seat face outlets toward the upper body side of the front seat and rear seat passengers.

  A foot passage 28 is formed between the hot air passage 19 and the face passage 26 so as to extend from the upper side to the lower side. An opening 29 a is provided, and a rear seat side foot opening 29 b is provided in the most downstream part of the foot passage 28.

  The front seat side and the rear seat side foot openings 29a and 29b are respectively connected to the front seat side and the rear seat side foot outlets disposed in the passenger compartment via the front seat side and the rear seat side foot duct (not shown), Air-conditioned air is blown out from these front seat and rear seat foot outlets toward the front and rear passengers' feet.

  The air flow upstream of the defroster opening 25, front seat side, rear seat side face openings 27a, 27b and front seat side, rear seat side foot openings 29a, 29b, respectively, is sent through the defroster opening 25. Defroster door 31 for adjusting the air volume, face door 32 for adjusting the air flow passing through the front seat side and rear seat face opening portions 27a and 27b, and the feed through the front seat side and rear seat side foot openings 29a and 29b A foot door 33 for adjusting the air volume is arranged.

  Each of these doors 31 to 33 constitutes a blowout mode door for switching the blowout mode, and is linked to a servomotor for driving the blowout mode door via a link mechanism (not shown) and is operated to rotate. The The operation of the servo motor for driving the blowout mode door is also controlled by a control signal output from an air conditioning control device (not shown).

  Next, details of the air guide 24 will be described. FIG. 2 shows a perspective view of the air guide 24, FIG. 3A shows a front view of the air guide 24 viewed from the front side of the vehicle, and FIG. 3B shows the air guide 24 in FIG. A right side view is shown, and FIG. 3C shows a top view of the air guide 24 in FIG. 4 is a sectional view taken along line XX of the air guide 24 in FIG. 3A. FIG. 5 is a sectional view taken along line YY of the air guide 24 in FIG. FIG. 3 shows a cross-sectional view of the air guide 24 taken along the line ZZ in FIG. The cross section taken along the line XX is a cross section of the air guide 24 in a direction perpendicular to the hot air flow in the hot air guide passage.

  The air guide 24 of the present embodiment forms two first hot air guide members 24a and an outer frame 2 of the air guide 24 as shown in FIGS. 2, 3A, 3C, and 4. The two first warm air guide members 24a and the two outer frame members 24c are arranged in a grid shape, that is, in parallel at a predetermined interval. These arrangement directions are the left-right direction of the vehicle (the direction perpendicular to the paper surface in FIG. 1), in other words, the flow direction of warm air (direction of arrow B) from the warm air passage 19 immediately before flowing into the air guide 24 and the air. This is a direction orthogonal to both the flow direction of the cold air from the cold air bypass passage 17 immediately before flowing into the guide 24 (arrow C direction). Further, the predetermined interval, that is, the interval 42 between the two first hot air guide members 24a in FIG. 3A is the width of the case 11 in the vehicle left-right direction and the first hot air guide in FIG. It is determined according to the width 41 of the member 24a.

  Further, a plurality of second warm air guide members 24a and the first warm air guide members 24a and the outer frame member 24c are connected to the outside of the two first warm air guide members 24a. A wind guide member 24b is provided.

  The first hot air guide member 24a is a tunnel-shaped member having a passage hole 24d through which hot air is passed, that is, a tubular member. The first hot air guide member 24a has a temperature from the hot air passage 19 so as to cross the cold air flow. The warm air guide passage 24d is configured to guide a part of the wind toward the vicinity of the defroster opening 25. As shown in FIG. 2, the first hot air guide member 24a has a tunnel shape in the entire region from the hot air inlet 24e to the hot air outlet 24f.

  The passage hole 24d, that is, the cross-sectional shape of the hot air guide passage 24d and the outer cross-sectional shape of the first hot air guide member 24a are arranged from the cold air bypass passage 17 to the air mix region as shown in FIGS. 20 is a flat shape that is elongated in a direction parallel to the flow direction of the cold air flowing into the direction 20 (arrow C direction), and has a streamlined shape with respect to the flow of the cold air. The streamline shape means that when the cool air flows toward the first warm air guide member 24a, the separation of the cool air flow from the first warm air guide member 24a does not occur, and before and after the first warm air guide member 24a. A shape that does not generate vortices or stagnation. Here, FIG. 7 shows an enlarged view of the first hot air guide member 24a in FIG. Specifically, as shown in FIG. 7, the cross-sectional shape of the outer shape of the first hot air guide member 24a is such that the upstream and downstream ends 24g and 24h of the cold air flow (in the direction of arrow C) are arc-shaped ( It has a rounded shape).

  Further, as shown in FIG. 7, the width dimension 41 of the outer shape of the first hot air guide member 24a in the direction perpendicular to the flow direction of the cold air (direction of arrow C) in the cross section of the first hot air guide member 24a is 5 mm. It is 20 mm or less. That is, as shown in FIG. 3A, the direction (the vehicle left-right direction) perpendicular to the hot air flow in the first hot air guide member 24a when the first hot air guide member 24a is viewed from the cold air bypass passage 17 side. ), The width 41 of the first warm air guide member 24a is 5 mm or more and 20 mm or less.

  Further, as shown in FIG. 5, the first hot air guide member 24 a (hot air guide passage 24 d) is formed in a shape that extends while curving in an arc shape, and the air guide 24 is disposed in the case 11. In this case, as shown in FIG. 1, it extends while curving in a substantially vertical direction, and the most downstream side of the warm air passage 19 and the region near the defroster opening 25 are communicated.

  Moreover, the end surface of the warm air outlet 24f of the first warm air guide member 24a (the warm air guide passage 24d) is a flat surface facing the upper side of the vehicle as shown in FIGS. It is inclined to the opposite side. The inclination means that the end face of the hot air outlet 24f is not parallel to the direction of the cold air flowing from the cold air bypass passage 17 (the direction of arrow C in the figure).

  Of the warm air that has passed through the heater core 15, the warm air that has flowed into the first warm air guide member 24 a is directly mixed with the cool air that has flowed into the air mix region 20 by the first warm air guide member 24 a. It is possible to flow out to a region near the defroster opening 25. When the defroster opening 25 is open, the first warm air guide member 24a guides the warm air flowing into the first warm air guide member 24a to the defroster opening 25, the defroster opening 25 is closed, and the face When the openings 27a and 27b are opened, the first warm air guide member 24a guides the warm air flowing into the first warm air guide member 24a to the face openings 27a and 27b.

  On the other hand, outside the first hot air guide member 24a, the cold air from the cold air bypass passage 17 that flows in the direction intersecting the hot air flow flowing in the first hot air guide member 24a, and the hot air passage 19 It collides with the inflowing hot air and mixes. This mixed air flows into any one of the defroster opening 25, the face openings 27a and 27b, and the foot openings 29a and 29b that are open.

  The second warm air guide member 24b is configured so that the warm air flowing in from the warm air inlet 20a side of the air mix basin 20 on the outside of the first warm air guide member 24a, as indicated by an arrow F in FIG. 20 is guided toward the cold air inlet 20b side.

  As shown in FIG. 6, the second hot air guide member 24b is formed in a substantially arc shape in cross section, and when the air guide 24 is disposed in the case 11, as shown in FIG. It arrange | positions so that the front-end | tip part of the flow downstream may extend toward the cold wind inlet 20b side.

  Thereby, the direction (arrow F) of the warm air that flows into the air mix region 20 without flowing into the first warm air guide member 24a out of the warm air that has passed through the heater core 15 is specifically directed to the cold air inlet 20b side. Guides the air mix area 20 toward the front side of the vehicle.

  Moreover, as shown in FIG. 2, FIG. 3 (b), (c), and FIGS. 4-7, the downstream side of the mixed air flow that flows outside the first hot air guide member 24a, that is, the cold air bypass passage 17 side. A rectifying plate 24i is formed at the end 24h (see FIG. 7). The rectifying plate 24i is a portion that is continuous with the first hot air guide member 24a and is a flat plate-like portion that is located on the downstream side of the mixed air flow with respect to the hot air guide passage 24d, and the first hot air guide member 24a. The flow of the mixed air mixed outside is rectified.

  The two first hot air guide members 24a and the outer frame member 24c are also connected by the connecting member 24j. The first hot air guide member 24a, the second hot air guide member 24b, and the outer frame The member 24c, the current plate 24i, and the connecting member 24j are integrally formed of the same material resin as the case 11.

  Further, in the present embodiment, two air guides 24 having the above-described configuration are used, and one air guide 24 is arranged for each of the left and right divided portions of the case 11, A pin provided in the case 11 is inserted into a hole 24k provided in the frame member 24c and is fixed to the case 11, and is supported by the left and right side surfaces of the case 11 while being positioned by a pin or the like provided in the case 11. Has been. Therefore, if the case 11 is divided, the air guide 24 can be removed. It should be noted that insertion holes for inserting the air guide 24 are provided on both the left and right side surfaces of the case 11, and after the air guide 24 is inserted into the case 11 from the insertion hole, it can be removably fixed with a metal spring clip or a screw. Good.

  As described above, in the air guide 24 of the present embodiment, the entire region from the hot air inlet 24e to the hot air outlet 24f forms the hot air guide passage 24d by the tunnel-like first hot air guide member 24a. Leakage of warm air from the middle of the warm air guide passage 24d can be prevented, and the transport efficiency of warm air through the warm air guide passage can be improved. Therefore, the width 41 of the first hot air guide member 24a can be set to 5 mm or more and 20 mm or less, and a part or all of the hot air guide passage has a shape in which the leeward side portion in the cold air flow direction is open. When the length of the hot air guide passage in the hot air flow direction is the same as that of the prior art constituted by the guide member, it is shown in FIG. The area of the first hot air guide member 24a, that is, the foreshadow projection area can be reduced.

  Furthermore, since the outer shape of the first hot air guide member 24a of the air guide 24 in the cross section is an elliptical streamline shape, it is possible to reduce the resistance coefficient of the cold air flow that contributes to the air flow resistance of the cold air.

  Therefore, according to the air guide 24 of the present embodiment, when the above-described conventional technology and the amount of warm air transported by the warm air guide passage are made equal, the foreshadow projection area and the resistance coefficient are larger than those of the above-described conventional technology. Since it can be made smaller, the ventilation resistance of the cold air flowing outside the hot air guide passage can be reduced as compared with the above-described prior art, and the noise caused by the cold air flow can be reduced.

  In addition, according to the present embodiment, when the total amount of hot air transported by the hot air guide passage 24d of the air guide 24 is the same as that of the conventional technology, the passage width of the hot air guide passage 24d is smaller than that of the conventional technology. Therefore, the mixing area of the cold air and the hot air flowing outside the hot air guide passage 24d can be increased as compared with the conventional technology, so that the collision area of the cold and hot air can be increased and the mixing of the cold and hot air is promoted. Can be made.

  Further, according to the present embodiment, of the warm air that has passed through the heater core 15 by the first warm air guide member 24a, the warm air that has flowed into the first warm air guide member 24a is cooled into the air mix region 20. Since it is possible to flow directly to the area near the defroster opening 25 without mixing with the defroster opening 25, a sufficient amount of hot air can be guided to the defroster opening 25 or the face openings 27a, 27b. For example, as described below, it is possible to reduce the upper and lower temperature difference in the bi-level mode.

  FIG. 8 shows the air temperature from the face air outlet and the air temperature from the foot air outlet during the bi-level mode of the vehicle air conditioner of this embodiment, and FIG. 9 shows the vehicle of this embodiment as a comparative example. The blowout air temperature from the face blower outlet and the blowout air temperature from the foot blower outlet at the time of the bi-level mode when the air guide 24 is omitted with respect to the air conditioner for air are shown. In the bi-level mode, air conditioning air is blown from the front and rear face outlets toward the occupant's upper body, and at the same time, air conditioning is performed from the front and rear foot outlets toward the passenger's feet. FIG. 8 and FIG. 9 show the average temperature of the front seat side and the rear seat side face outlet and the average temperature of the front seat side and the rear seat side foot outlet.

  As can be seen by comparing FIG. 8 and FIG. 9, according to the present embodiment, the difference between the air temperature from the face air outlet and the air temperature from the foot air outlet in the bi-level mode, A temperature difference can be reduced. Specifically, when the vertical temperature difference in the comparative example is 25 to 31.5 ° C., the vertical temperature difference can be set to 13 to 16 ° C. according to the present embodiment.

  In the present embodiment, the air guide 24 has a configuration in which two first hot air guide members 24a and two outer frame members 24c are arranged in parallel at a predetermined interval, and cool air is placed outside the first hot air guide member 24a. Therefore, the first hot air guide member 24a itself has a rectifying action of the hot air and the cold air flowing outside the first hot air guide member 24a. Further, since the rectifying plate 24i is provided at the end 24h of the first hot air guide member 24a on the cold air bypass passage 17 side, the air guide 24 of the present embodiment has a high rectifying action.

  Here, unlike the present embodiment, when the air guide 24 is not used in the air conditioning unit 10 described above, in the air mix region 20, the hot air is pushed by the cold air and is biased toward the case side in the vehicle left-right direction. Insufficient wind mixing. On the other hand, in this embodiment, since the straightness of the wind flowing through the plurality of passages cut by the first hot air guide member 24a and the rectifying plate 24i is ensured, the cold air guided into the passages And the warm air must collide stably in the subdivided mixing zone, and this effect promotes the mixing of the cold and warm air.

(Second Embodiment)
In FIG. 10, the cross section of the 1st warm air guide member 24a in 2nd Embodiment is shown. 10 corresponds to FIG. 7, and the same reference numerals are given to the same components as those in FIG.

  In the first embodiment, as shown in FIG. 7, the outer shape of the first hot air guide member 24a in the cross section is elliptical, so that the outer shape of the first hot air guide member 24a is streamlined with respect to the cold air flow. However, in this embodiment, as shown in FIG. 10, the upstream portion 24g of the cold air flow (in the direction of arrow C) has an arc shape, and the downstream portion 24h of the cold air flow has a throttle shape (tapered shape). By adopting the blade shape, the outer shape of the first hot air guide member 24a is a streamline shape with respect to the cold air flow.

  As long as the outer shape of the first hot air guide member 24a is a streamline shape with respect to the cold air flow, the outer shape of the first hot air guide member 24a may be different from those of the first and second embodiments. However, the streamline shape referred to in this specification includes, for example, making the portion 24g upstream of the cold air flow into an acute shape (tapered shape), and converting the portion 24g upstream of the cold air flow into the cold air flow. It does not include a shape having a plane portion orthogonal to the shape or a simple circular shape of the outer shape of the first hot air guide member 24a in the cross section.

(Third embodiment)
In FIG. 11, the longitudinal cross-sectional view of the 1st warm air guide member 24a in 3rd Embodiment is shown. FIG. 11 corresponds to FIG. 5 which is a cross-sectional view taken along the line YY in FIG. 3A, and the same reference numerals as those in FIG. In addition, in the 1st warm air guide member 24a of FIG. 11, the baffle plate 24i is abbreviate | omitted.

  In the present embodiment, as shown in FIG. 11, the first hot air guide member 24a (the hot air guide passage 24d) has a shape extending linearly, and the end surface of the hot air outlet 24f is a flat surface facing the upper side of the vehicle. However, the surface is parallel to the cold air flow. As described above, the orientation of the end face of the hot air outlet 24f of the first hot air guide member 24a may be changed.

(Fourth embodiment)
In FIG. 12, the longitudinal cross-sectional view of the 1st warm air guide member 24a in 4th Embodiment is shown. 12 corresponds to FIG. 5 which is a cross-sectional view taken along the line YY in FIG. 3A, and the same reference numerals as those in FIG. In addition, in the 1st warm air guide member 24a of FIG. 12, the baffle plate 24i is abbreviate | omitted.

  In the present embodiment, as shown in FIG. 12, the first warm air guide member 24a (the warm air guide passage 24d) has a shape extending linearly, and the end surface of the warm air outlet 24f is a flat surface facing the upper side of the vehicle. And, it inclines toward the cold wind pie bus passage 17 side. As described above, the orientation of the end face of the hot air outlet 24f of the first hot air guide member 24a may be changed.

  According to this embodiment, the position of the hot air outlet 24f of the hot air guide member 24a is shifted to the vehicle lower side by shortening the first hot air guide member 24a with respect to the air guide 24 in FIG. By allowing the cool air to pass above the warm air outlet 24f, the amount of warm air flowing through the first warm air guide member 24a (the warm air guide passage 24d) can be adjusted.

(Fifth embodiment)
In FIG. 13, the longitudinal cross-sectional view of the 1st warm air guide member 24a in 5th Embodiment is shown. FIG. 15 corresponds to FIG. 6 which is a cross-sectional view taken along the line ZZ in FIG. 3A, and the same reference numerals as those in FIG.

In the first embodiment, the second hot air guide member 24b has a substantially arc-shaped cross section, but in this embodiment,
As shown in FIG. 13, the second hot air guide member 24 b has a flat plate shape.

  As described above, the shape of the second warm air guide member 24b can be arbitrarily changed so that the flow direction of the warm air flowing outside the first warm air guide member 24a becomes a desired direction.

(Other embodiments)
In the above-described embodiment, one air guide 24 is arranged for each of the left and right divided portions of the case 11, but one air guide having a length equivalent to the length of the case 11 in the left-right direction. May be arranged. That is, the number of the first hot air guide members 24a provided in the air guide 24 may be one, or may be three or more.

  Then, with respect to the state in which the plurality of first hot air guide members 24a are arranged in parallel at predetermined intervals, some of the plurality of first hot air guide members 24a are replaced with partition members having the same shape as the outer frame member 24c. May be. At this time, for example, when the first warm air guide member 24a and the partition member are arranged between the two outer frame members 24c, the first warm air guide member 24a is disposed at the end, and the partition member is disposed at the center. May be. In this way, the hot air may be guided only to a portion of the air flow downstream side of the air mix region 20 where the temperature is particularly low.

  In the above-described embodiment, the first and second air mix doors 21 and 22 are configured as so-called butterfly doors, but a so-called single piece in which a rotation shaft is provided on one end side of the plate-like door main body. You may comprise with a holding door. In the above-described embodiment, two air mix doors are used. However, the number of air mix doors may be changed to one.

It is a figure showing the section composition of the air-conditioner in a 1st embodiment of the present invention. It is a perspective view of the air guide 24 in FIG. (A) is a front view of the air guide 24, (b) is a right side view of the air guide 24, and (c) is a top view of the air guide 24. It is XX sectional drawing of the air guide 24 in Fig.3 (a). It is the YY sectional view taken on the line of the air guide 24 in Fig.3 (a). It is a ZZ line sectional view of air guide 24 in Drawing 3 (a). It is an enlarged view of the 1st warm air guide member 24a in FIG. It is a figure which shows the vehicle interior blowing temperature change with respect to the opening change of the air mix door at the time of the bilevel mode of 1st Embodiment. It is a figure which shows the vehicle interior blowing temperature change with respect to the opening change of the air mix door at the time of the bi-level mode of a comparative example. It is a cross-sectional view of the 1st hot air guide member 24a in 2nd Embodiment of this invention. It is a longitudinal cross-sectional view of the 1st warm air guide member 24a in 3rd Embodiment of this invention. It is a longitudinal cross-sectional view of the 1st warm air guide member 24a in 4th Embodiment of this invention. It is a longitudinal cross-sectional view of the 1st warm air guide member 24a in 5th Embodiment of this invention.

Explanation of symbols

17 Cold air bypass passage 19 Hot air passage 20 Air mix area 24 Air guide 24a First hot air guide member 24b Second hot air guide member 24c Outer frame member 24d Hot air guide passage 24e Hot air inlet 24f of hot air guide passage 24f Hot air outlet of the guide passage

Claims (10)

A case (11) that forms an air passage through which air flows toward the passenger compartment;
A heating heat exchanger (15) disposed in the case (11) for heating air;
A hot air passage (19) formed in the case (11) and through which the hot air having passed through the heating heat exchanger (15) flows;
A cold air bypass passage (17) formed in the case (11) and through which the cold air flows by bypassing the heating heat exchanger (15);
An air mix door (21, 22) that is arranged in the case (11) and adjusts 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 (17); ,
A plurality of outlet openings (25, 27a, 27b, 29a, provided in the case (11) and for blowing out the conditioned air temperature-adjusted by the air mix doors (21, 22) to a plurality of parts in the passenger compartment. 29b) with a vehicle air conditioner,
The hot air passage (19) and the cold air bypass passage (17) in the case (11) are arranged at a junction (20) between the hot air passage (19) and a part of the hot air from the hot air passage (19) is predetermined. A hot air guide passage (24d) for guiding the blowout opening (25);
The entire area from the hot air inlet (24e) to the hot air outlet (24f) of the hot air guide passage (24d) is constituted by a tunnel-like hot air guide member (24a). And
Cold air from the cold air bypass passage (17) that has flowed outside the hot air guide passage (24d) in a direction intersecting the flow direction of the hot air flowing through the hot air guide passage, and the hot air A vehicle air conditioner characterized in that it mixes with warm air flowing in from the passage (19).   The width of the hot air guide member (24a) in a direction orthogonal to the flow direction of the hot air in the hot air guide passage when the hot air guide member (24a) is viewed from the cold air bypass passage (17) side. (41) is 5 mm or more and 20 mm or less, The vehicle air conditioner of Claim 1 characterized by the above-mentioned.   The outer shape of the hot air guide member (24a) in a cross section in a direction orthogonal to the flow direction of the hot air in the hot air guide passage is a direction parallel to the flow direction of the cold air from the cold air bypass passage (17). The vehicle air conditioner according to claim 1 or 2, wherein the vehicle air conditioner has a long shape and a streamline shape with respect to a flow of the cold air from the cold air bypass passage (17).   The vehicle air conditioner according to claim 3, wherein an outer shape of the hot air guide member (24a) in the cross section is an elliptical shape.   The outer shape of the hot air guide member (24a) in the cross section is a blade shape in which the upstream portion (24g) of the cold air flow has an arc shape and the downstream portion (24h) of the cold air flow has a throttle shape. The vehicle air conditioner according to claim 3, wherein   The end face of the hot air outlet (24f) of the hot air guide member (24a) is inclined toward the cold air bypass passage (17), according to any one of claims 1 to 5. Vehicle air conditioner.   The end face of the hot air outlet (24f) of the hot air guide member (24a) is inclined to the side opposite to the cold air bypass passage (17) side. The vehicle air conditioner as described in one.   The rectifying plate (24i) is provided at an end (24h) opposite to the cold air bypass passage (17) side of the hot air guide member (24a). The vehicle air conditioner according to claim 1.   A plurality of the hot air guide members (24a) are provided at predetermined intervals in a direction orthogonal to both the flow direction of the hot air from the hot air passage (19) and the flow direction of the cold air from the cold air bypass passage (17). The vehicle air conditioner according to any one of claims 1 to 8, wherein the vehicle air conditioner is arranged in parallel. The tunnel-shaped hot air guide member is a first hot air guide member (24a),
Between the adjacent first hot air guide members (24a), a second hot air guide member (24b) for guiding the hot air flowing outside the first hot air guide member (24a) in a predetermined direction is provided. The vehicle air conditioner according to claim 9, wherein the vehicle air conditioner is provided.

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