JP2006341727A - Air conditioner for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner for a vehicle capable of reducing wind noise in an air conditioning unit without causing the increase of cost. <P>SOLUTION: The air conditioner for the vehicle is equipped with a case 11 and a heat exchanger 13 for cooling. The heat exchanger for cooling has a heat exchanging part 13e composed of the laminated structure of a tube 13c and a heat transmission fin 13d. The blowing air a1 flowing in the case 11 is blown toward the inflow surface 13g of the heat exchanging part 13e at an acute angle, and a blowing air guide member 16 guiding the flow of the blowing air a1 is disposed on the inflow surface 13g. A main body 17 guiding the flow of the blowing air a1 and a column 18 projecting to the inflow surface 13g side are integrally formed to the blowing air guide member 16, and the column 18 is inserted and held in an air circulation space 13i formed by enclosing the tube 13c and the heat transmission fin 13d. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicle air conditioner that reduces wind noise generated in an air conditioning unit.

  Conventionally, from the viewpoint of reducing the size of a vehicle air-conditioning unit and improving mountability in a vehicle interior, in addition to a cooling heat exchanger and a heating heat exchanger, an air blower unit is also installed in a single case as an indoor unit unit. A blower-integrated air conditioning unit that is configured integrally with the above is known from Patent Document 1.

  In this prior art, a cooling heat exchanger composed of a laminated structure of tubes and heat transfer fins is arranged substantially vertically below the blower unit, and heating heat exchange is performed on the vehicle rear side of the cooling heat exchanger. The apparatus is arranged substantially vertically, and an air mix door is arranged above the heat exchanger for heating. Furthermore, a face passage that guides air to the face opening and the defroster opening and a foot passage that guides air to the foot opening are disposed on the vehicle rear side of the blower portion and above the air mix door. .

In addition, arrange | positioning the heat exchanger for air_conditioning | cooling substantially vertically means arrange | positioning the inflow surface which is a surface by which the air of an air blower is ventilated among heat exchangers for air_conditioning | cooling substantially vertically.
JP 2003-306026 A

  FIG. 11 is an enlarged cross-sectional view showing a main part of a known vehicle air-conditioning unit 51 in which a countermeasure against wind noise is applied to the vehicle air-conditioning unit of Patent Document 1 described above.

  The vehicle air-conditioning unit 51 is disposed at a substantially central portion in the vehicle width (left and right) direction inside an instrument panel (not shown) at the front of the vehicle interior. At that time, the vehicle air conditioning unit 51 is mounted as shown by the arrows in FIG. Therefore, the vehicle width direction is the direction perpendicular to the paper surface of FIG.

  According to this prior art, in the case 11 of the vehicle air conditioning unit 51, the evaporator 13 that forms a cooling heat exchanger is arranged substantially vertically on the vehicle lower side of the blower section.

  As is well known, the evaporator 13 has a heat exchange part 13e having a laminated structure of tubes 13c through which refrigerant fluid flows and corrugated heat transfer fins 13d between the upper and lower tank parts 13a and 13b. It is a configuration. Both ends of the tube 13c in the longitudinal direction (substantially vertical direction in FIG. 11) are connected to the upper and lower tank portions 13a and 13b. In this prior art, a flat tube that is flat in the stacking direction of the heat exchanging portion 13e (the direction perpendicular to the paper surface of FIG. 11) is used as the tube 13c.

  A side plate 13j is arranged in parallel with the tubes 13c on the outer side in the stacking direction of the tubes 13c and the heat transfer fins 13d of the heat exchanging portion 13e.

  In the heat exchanging portion 13e, a large number of air circulation spaces 13i formed by being surrounded by the tubes 13c and the heat transfer fins 13d are inflow surfaces on the side where air is blown from the blower (right side in FIG. 11). It penetrates from 13g to the outflow surface 13h on the other side (left side in FIG. 11).

  In such a configuration, the angle θ between the blown air a1 blown from the blower to the inflow surface 13g of the evaporator 13 and the inflow surface 13g is an acute angle. Then, as indicated by the arrow b, the blown air a1 changes in the flow direction substantially perpendicular to the inflow surface 13g and flows into the air circulation space 13i in the heat exchange part 13e.

  Thus, when the flow direction of the blast air a1 changes greatly, the turbulence of the flow increases, and wind noise is generated due to the turbulence of the flow. And this wind noise is transmitted to passengers in the passenger compartment as unpleasant noise.

  Therefore, in this prior art, the mesh member 52 is used to reduce wind noise. FIG. 12 is a view showing only the evaporator 13 in the direction of arrow K in FIG.

  As shown in FIGS. 11 and 12, the mesh member 52 is formed by the outer peripheral portion of the inflow surface 13g, that is, the upper and lower tank portions 13a and 13b and the side plates 13j so as to cover the entire inflow surface 13g of the heat exchange portion 13e. It is fixed with a double-sided tape 53. In this prior art, the mesh member 52 is formed of resin.

  As is well known, the mesh member 52 has a rectifying effect that arranges a turbulent flow into a uniform flow. Due to the rectifying effect of the mesh member 52, wind noise caused by the flow disturbance is reduced.

  By the way, when the mesh member 52 is in contact with the tube 13c, dust accumulates between the mesh member 52 and the tube 13c, and the tube 13c is corroded. Therefore, in this prior art, a spacer member 54 for securing a gap is attached between the mesh member 52 and the tube 13c to prevent the tube 13c from corroding.

  The spacer member 54 includes a main body portion 55 having a substantially rectangular flat plate shape with a predetermined thickness c2, and column portions 18 disposed at both ends in the longitudinal direction of the main body portion 55 and projecting toward the inflow surface 13g. It is integrally molded.

  The spacer member 54 is disposed substantially at the center in the longitudinal direction (vertical direction in FIG. 12) of the tube 13c of the evaporator 13, and the longitudinal direction of the main body 55 is parallel to the longitudinal direction of the tube 13c. Furthermore, two spacer members 54 are arranged in a line with a predetermined interval in the stacking direction of the tubes 13c and the heat transfer fins 13d (left and right direction in FIG. 12).

  At this time, the column portion 18 is inserted into the air circulation space 13 i at a predetermined position among the many air circulation spaces 13 i of the evaporator 13. FIG. 7 is an enlarged view of the column portion 18 and the heat transfer fin 13d in the DD cross section of FIG. 12, and the vertical direction of FIG. 7 is the longitudinal direction of the tube 13c.

  As shown in FIG. 7, the column portion 18 includes a root-side saw-tooth portion 18 a and a tip-side tip portion 18 b. The sawtooth portion 18a has a shape in which a sawtooth-shaped step is provided on the front and back surfaces of a rectangular flat plate having a thickness t. In other words, the side where the front and back surfaces of the sawtooth portion 18a are in contact with the heat transfer fins 13d, that is, a tube It is formed to be on the longitudinal direction side of 13c. The tip 18b is formed in a quadrangular pyramid shape.

  Since the thickness t of the sawtooth portion 18a of the column portion 18 is formed slightly larger than the interval h between the heat transfer fins 13d in the air circulation space 13i, the column portion 18 pushes the heat transfer fin 13d in the air circulation space 13i. Inserted while spreading.

  A part of the heat transfer fin 13d is cut and raised in the longitudinal direction of the tube 13c to form a cut and raised part 13m and a slit part 13n. The cut and raised portions 13m and the slit portions 13n are provided to increase the heat transfer properties of the heat transfer fins 13d, and are arranged in a large number at equal intervals in the air flow direction (arrow b).

  The spacer member 54 is held in the evaporator 13 by fitting the sawtooth portion 18a of the column portion 18 into the slit portion 13n of the heat transfer fin 13d.

  As described above, the two spacer members 54 are interposed between the mesh member 52 and the tube 13c, thereby forming a gap 56 (FIG. 11) between the mesh member 52 and the tube 13c. The gap 56 prevents dust from accumulating between the mesh member 52 and the tube 13c, thereby preventing corrosion of the tube 13c due to dust.

  However, in this prior art, the cost is increased due to parts formed separately from the mesh member 52 such as the double-sided tape 53 and the spacer member 54, and the assembly work is complicated by the separate parts, which further increases the cost. There is a problem of inviting.

  An object of this invention is to provide the vehicle air conditioner which can reduce the wind noise in an air conditioning unit, without causing the increase in cost in view of the said point.

In order to achieve the above object, in the first aspect of the present invention, a case (11) that forms an air passage through which air flows toward the vehicle interior;
A cooling heat exchanger (13) disposed in the case (11) for cooling the air,
The cooling heat exchanger (13) includes a heat exchanger (13e) having a laminated structure of a tube (13c) through which a refrigerant fluid flows and a heat transfer fin (13d) joined to the tube (13c). Have
The blown air (a1) flowing in the case (11) is blown at an acute angle toward the inflow surface (13g) of the heat exchange part (13e),
In the vehicle air conditioner in which a blowing guide member (16) for guiding the flow of the blown air (a1) is arranged on the inflow surface (13g),
A body part (17) for guiding the flow of the blown air (a1) and a column part (18) protruding toward the inflow surface (13g) are integrally formed on the air blowing guide member (16),
The column part (18) is inserted and held in an air circulation space (13i) formed by being surrounded by the tube (13c) and the heat transfer fin (13d).

  Here, the air blowing guide member (16) is provided to reduce wind noise, and the main body (17) of the air blowing guide member (16) has a net-like shape as in the prior art and will be described later. Including a plate-like material.

  According to this, the main body part (17) for guiding the flow of the blown air (a1) and the column part (18) protruding toward the inflow surface (13g) are integrally formed on the air blowing guide member (16). Since the column part (18) is inserted and held in the air circulation space (13i) surrounded by the tubes (13c) and the heat transfer fins (13d) of the cooling heat exchanger (13), A separate part for fixing the guide member (16) to the cooling heat exchanger (13) becomes unnecessary, and the assembling work becomes easy.

  As a result, wind noise in the air conditioning unit can be reduced without increasing the cost.

According to a second aspect of the present invention, in the vehicle air conditioner according to the first aspect, a seat surface portion (19) that contacts the inflow surface (13g) is integrally formed on the main body portion (17),
A gap (21) having a predetermined dimension is formed between the main body (17) and the inflow surface (13g) by the seat surface portion (19).

  This eliminates the need for a separate part for securing the gap (21) between the main body (17) and the inflow surface (13g) of the air blowing guide member (16) and facilitates the assembly work. Become.

  As a result, wind noise in the air conditioning unit can be reduced without increasing the cost.

  As in the invention according to claim 3, in the vehicle air conditioner according to claim 2, if the seat surface part (19) is arranged at the base part of the pillar part (18), the pillar part (18). The strength of the root part of can be increased.

  As a result, it is possible to prevent the column portion (18) from being broken at the base portion of the column portion (18).

In invention of Claim 4, in the vehicle air conditioner as described in any one of Claim 1 thru | or 3, the said tube (13c) and the said heat-transfer fin (13d) of the said heat exchange part (13e) A side plate (13j) is arranged on the outer side in the stacking direction of
The air blowing guide member (16) is disposed over the entire length in the stacking direction of the heat exchange part (13e),
A claw portion (20) that engages with the side plate (13j) is integrally formed at both ends in the stacking direction of the air blowing guide member (16).

  According to this, not only the column part (18) is inserted into the air circulation space (13i) of the cooling heat exchanger (13) but also the claw part (20 formed integrally with the air blowing guide member (16). ) Engages with the side plate (13j) of the cooling heat exchanger (13), so that the air blowing guide member (16) can be more securely held in the cooling heat exchanger (13) without causing an increase in cost. .

  As in the invention according to claim 5, in the vehicle air conditioner according to any one of claims 1 to 4, only one air blowing guide member (16) is arranged on the inflow surface (13g). In this case, the cost of the air blowing guide member (16) can be minimized.

  As a result, wind noise in the air conditioning unit can be reduced without increasing the cost.

  Next, claim 6 will be described. As shown in FIG. 11, the angle at which the blown air (a1) hits the edge (13f) of the heat transfer fin (13d) of the cooling heat exchanger (52), in other words, the edge of the heat transfer fin (13d). An angle formed by the extending direction (i) of the portion (13f) and the flow direction of the blown air (a1) is defined as an angle of attack (α).

  When this angle of attack (α) is large, the blown air (a1) hits the edge (13f) of the heat transfer fin (13d) and the flow is separated to generate a vortex (v).

  Through experiments and analysis, the inventor has found that wind noise can be reduced by suppressing flow separation at the edge portion (13f) of the heat transfer fin (13d) and suppressing generation of vortices (v). Obtained.

  In view of the above point, in the invention according to claim 6, in the vehicle air conditioner according to any one of claims 1 to 5, the main body (17) is configured to flow the blown air (a1). It is formed in a plate shape whose direction is changed from an acute angle to the inflow surface (13g) to a direction substantially perpendicular to the inflow surface (13g).

  According to this, a plate-shaped main-body part (17) changes the flow direction of blowing air (a1) from a direction with an acute angle with respect to an inflow surface (13g) to a direction substantially perpendicular | vertical with respect to an inflow surface (13g). Therefore, the angle of attack (α), that is, the angle at which the blown air (a1) hits the edge portion (13f) of the heat transfer fin (13d) can be reduced.

  As a result, the blown air (a1) flows smoothly along the edge portion (13f) of the heat transfer fin (13d), and the flow separation and the generation of the vortex (v) can be suppressed, so that wind noise can be reduced.

  Thereby, since the main-body part (17) of a ventilation guide member (16) can be made into a plate-shaped simple shape, a ventilation guide member (16) can be made cheap.

  As a result, wind noise in the air conditioning unit can be reduced without increasing the cost.

  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.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic cross-sectional view of the overall configuration of an indoor unit 10 of a vehicle air conditioner according to this embodiment. The indoor unit portion 10 is disposed at a substantially central portion in the vehicle width (left and right) direction inside an instrument panel (not shown) at the front of the vehicle interior. At that time, the indoor unit 10 is mounted as indicated by arrows in FIG. Therefore, the vehicle width direction is the direction perpendicular to the paper surface of FIG.

  The indoor unit section 10 according to the present embodiment has a case 11 that forms an air passage through which air flows toward the vehicle interior. In this single case 11, the blower unit 12, the evaporator 13 that forms a cooling heat exchanger, and the heater core 14 that forms a heating heat exchanger are integrally arranged.

  More specifically, the case 11 constitutes a vertically long case shape by integrally fastening left and right divided case bodies divided by a dividing surface located in the center of the indoor unit portion 10 in the vehicle width direction. . The left and right divided case bodies have a certain degree of elasticity, such as polypropylene, and are formed of a resin material having high mechanical strength.

  The blower unit 12 is disposed on the upper side of the vehicle front side region in the case 11, and the evaporator 13 is disposed on the lower side of the blower unit 12. The blower unit 12 houses a centrifugal blower fan 12a that is rotationally driven by an electric motor in a scroll casing 12b.

  Since the rotating shaft 12c of the blower unit 12 faces the vehicle width direction, the suction port (not shown) of the centrifugal blower fan 12a is located on the side surface portion of the indoor unit unit 10 on one side in the vehicle width direction. Then, an inside / outside air switching box (not shown) is connected to the suction port portion, and the inside air (vehicle interior air) or the outside air (vehicle exterior air) sucked through the inside / outside air switching box is blown by the blower fan 12a.

  And since the nose part 12d used as the spiral winding start part of the scroll casing 12b is located in the downward side, and the air outlet part 12e of the scroll casing 12b is directed downward, the blown air of the blower fan 12a is indicated by the arrow a. As described above, the air flows from the upper side to the lower side of the vehicle front side region and is blown to the front portion of the evaporator 13.

  The evaporator 13 has a substantially rectangular thin shape having substantially the same vehicle width direction dimensions as the case 11 and is disposed substantially vertically. Refrigerant fluid decompressed by decompression means of an air conditioning refrigeration cycle (not shown) is introduced into the evaporator 13, and the refrigerant fluid absorbs heat from the blown air and evaporates to cool the air.

  In the case 11, a bottom surface portion located below the evaporator 13 constitutes a condensed water receiving portion, and a condensed water discharge pipe 15 is formed at the bottom of the case 11.

  FIG. 2 is a view showing only the evaporator 13 as viewed in the direction of arrow A in FIG. 1, and FIG. 3 is a cross-sectional view taken along line BB in FIG. As shown in FIGS. 2 and 3, the evaporator 13 is, as is well known, a laminated structure of tubes 13 c and refrigerant corrugated heat transfer fins 13 d between the upper and lower tank portions 13 a and 13 b. It is the structure which has arrange | positioned the heat exchange part 13e which consists of.

  Both ends of the tube 13c in the longitudinal direction are connected to the upper and lower tank portions 13a and 13b. In this example, the tube 13c is a flat tube that is flat in the stacking direction of the heat exchanging portion 13e (the left-right direction in FIG. 2).

  In the heat exchanging part 13e, a large number of air circulation spaces 13i formed by being surrounded by the tubes 13c and the heat transfer fins 13d are on the side where the air is blown from the blower part 12 (the paper surface side in FIG. 2). It penetrates from the inflow surface 13g to the outflow surface 13h on the other side (the back surface side in FIG. 2).

  The blown air from the blower unit 12 flows into the large number of air circulation spaces 13i from the inflow surface 13g side as indicated by the arrow b, and passes through the large number of air circulation spaces 13i to the outflow surface 13h side as indicated by the arrow d. And leaked.

  FIG. 4 is an enlarged view of part C in FIG. 3, that is, one end side (the vehicle left side) of the heat exchange part 13e in the stacking direction. The other end side (right side of the vehicle) is symmetrical to FIG.

  As shown in FIG. 4, on the outer side in the stacking direction of the heat exchanging portion 13e (right side in FIG. 4), a side plate 13j forming a reinforcing member of the heat exchanging portion 13e is arranged in parallel with the tube 13c.

  The side plate 13j is formed of a metal such as aluminum, and is joined to the upper and lower tank portions 13a and 13b and the heat transfer fins 13d by means such as brazing. A bent portion 13k for ensuring the rigidity of the side plate 13j is formed at the end portions of the side plate 13j on the inflow surface 13g side and the outflow surface 13h side.

  On the inflow surface 13g of the evaporator 13, a blow guide member 16 for guiding the flow of blown air is disposed over the entire length in the stacking direction of the heat exchanging portion 13e at a substantially longitudinal center of the tube 13c. The air guide member 16 includes a main body portion 17, a column portion 18, a seat surface portion 19 and a claw portion 20 described below, and is integrally formed of a resin material.

  5 (a) is an enlarged view of the air blowing guide member 16 in FIG. 2, FIG. 5 (b) is an E arrow view in FIG. 5 (a), and FIG. 5 (c) is an F arrow in FIG. 5 (b). FIG.

  As shown in FIGS. 5A to 5C, the air guide member 16 is formed with a main body portion 17 that changes the flow direction of the blown air in a substantially rectangular flat plate shape. The flat plate surface of the main body portion 17 is arranged perpendicular to the inflow surface 13g of the heat exchange portion 13e. In other words, the front and back surfaces of the main body portion 17 are arranged facing the longitudinal direction of the tube 13c.

  In the vicinity of both ends of the main body portion 17 of the air guide member 16, column portions 18 are formed so as to protrude toward the inflow surface 13g side of the heat exchange portion 13e.

  6A is an enlarged view of a G portion in FIG. 5B, and FIG. 6B is a view taken in the direction of arrow H in FIG. 6A.

  As shown in FIGS. 6A and 6B, the column portion 18 includes a root-side sawtooth portion 18a and a tip-side tip portion 18b. The sawtooth portion 18 a has a shape in which a sawtooth-shaped step is provided on the front and back surfaces of a rectangular flat plate having a thickness t, and is formed so that the front and back surfaces of the sawtooth portion 18 a are parallel to the front and back surfaces of the main body portion 17. The The tip 18b is formed in a quadrangular pyramid shape.

  This column part 18 is inserted into the air circulation space 13i at a predetermined position among the many air circulation spaces 13i formed in the heat exchange part 13e.

  7 is an enlarged view of the column portion 18 and the heat transfer fin 13d in the DD cross section of FIG. 4, and the vertical direction of FIG. 7 is the longitudinal direction of the tube 13c.

  As shown in FIG. 7, the thickness t of the sawtooth portion 18a of the column portion 18 is formed to be slightly larger than the interval h between the heat transfer fins 13d of the air circulation space 13i. The heat transfer fin 13d is inserted while being spread.

  Since the tip end portion 18b of the column portion 18 has a quadrangular pyramid shape, the heat transfer fins 13d in the air circulation space 13i can be smoothly spread.

  A part of the heat transfer fin 13d is cut and raised in the longitudinal direction of the tube 13c to form a cut and raised part 13m and a slit part 13n. The cut and raised portions 13m and the slit portions 13n are provided to increase the heat transfer performance of the heat transfer fins 13d, and are arranged in a large number at equal intervals in the air flow direction (arrow b).

  The blower guide member 16 is held in the evaporator 13 by fitting the sawtooth portion 18a of the column portion 18 into the slit portion 13n of the heat transfer fin 13d.

  In addition, a seat surface portion 19 is formed at the base portion of the column portion 18 to secure a gap between the main body portion 17 and the tube 13c. The seat surface portion 19 protrudes in a stepped manner from the base portion of the column portion 18. In this example, the width of the step surface 19a parallel to the longitudinal direction of the column portion 18 is formed as c1, and the width of the contact surface 19b parallel to the longitudinal direction of the main body portion 17 is formed as W.

  When the column portion 18 of the air blowing guide member 16 is inserted into the air circulation space 13i at a predetermined position of the evaporator 13, the contact surface 19b of the seat surface portion 19 comes into contact with the tube 13c of the inflow surface 13g as shown in FIG. A gap 21 having a predetermined dimension c1 is formed between the main body portion 17 of the guide member 16 and the tube 13c.

  The gap 21 having the predetermined dimension c1 can prevent dust from accumulating between the main body portion 17 of the air guide member 16 and the tube 13c, and can prevent corrosion of the tube 13c due to dust.

  Furthermore, since the strength of the base portion of the column portion 18 can be increased by the seat surface portion 19, it is possible to prevent the column portion 18 from being broken at the base portion of the column portion 18.

  The air guide member 16 is formed with a plate-like claw portion 20 that protrudes from both end portions of the main body portion 17 to the side plate 13j of the heat exchanging portion 13e. The plate-shaped claw portion 20 is disposed in parallel with the side plate 13j of the heat exchanging portion 13e, and has a refracting portion 20a that is refracted in a “U” shape toward the center side of the main body portion 17.

  When the column portion 18 of the air guide member 16 is inserted into the air circulation space 13i at a predetermined position, the refracting portion 20a of the claw portion 20 engages with the bent portion 13k of the side plate 13j of the heat exchange portion 13e.

  As a result, the air blowing guide member 16 is not only held by the evaporator 18 by the column portion 18 but also held by the evaporator 13 by the claw portion 20, so that the air blowing guide member 16 is more securely attached to the evaporator 13. Can hold.

  By configuring the air guide member 16 in this way, the air guide member 16 can be held in the evaporator 13 without using separate parts, and corrosion of the tube 13c can be prevented. As a result, the assembling work of the air guide member 16 is facilitated, and the cost of the air guide member 16 can be reduced.

  Incidentally, in the case 11 shown in FIG. 1, the heater core 14 is arranged on the downstream side of the air flow of the evaporator 13, that is, on the outflow surface 13 h side of the evaporator 13. The heater core 14 heats air using hot water (cooling water) from a vehicle engine (not shown) as a heat source. The heater core 14 has a heat exchange portion having a laminated structure of a tube and a corrugated heat transfer fin between a lower hot water inlet tank portion 14a and an upper hot water outlet tank portion 14b arranged to face each other at a predetermined interval. 14c is arranged.

  The heater core 14 is disposed such that the hot water outlet tank portion 14b above the lower hot water inlet tank portion 14a is inclined toward the vehicle rear side. The plate-shaped air mix door 22 is disposed above the heater core 14, and the rotary shaft 22 a of the air mix door 22 is disposed near the upper end of the heater core 14.

  The rotary shaft 22a of the air mix door 22 is arranged so as to extend in the direction perpendicular to the plane of the drawing (vehicle width direction) in FIG. 1, and both ends of the rotary shaft 22a are rotated by bearing holes (not shown) in the side wall portion of the case 11. Held possible.

  In the case 11, a cold air bypass passage 23 is formed on the upper side of the heater core 14 (the vehicle rear side of the evaporator 13) to bypass the heater core 14 and to flow the cold air as indicated by an arrow e. On the other hand, in the case 11, a hot air passage 24 through which the hot air heated by the heater core 14 flows as indicated by an arrow f is formed in a portion from the rear side of the heater core 14 to the upper side of the heater core 14.

  A hot air guide wall 25 is formed in the case 11 so as to protrude from the rear surface 11 a of the case 11 to the upper side of the heater core 14. The hot air guide wall 25 defines the upper side of the hot air passage 24 and guides the hot air flow in the hot air passage 24 toward the cold air bypass passage 23 as indicated by an arrow f.

  Further, in the case 11, a cold air guide wall 26 is formed on the case wall surface adjacent to the cold air bypass passage 23 so as to face the tip of the hot air guide wall 25. The cold air guide wall 26 guides the cold air from the cold air bypass passage 23 toward the hot air side of the hot air passage 24. As a result, an air mixing portion 27 that can mix hot air and cold air well is formed on the upper side of the heater core 14 and around the tip portions of the guide walls 25 and 26.

  In FIG. 1, the solid line position of the air mix door 22 is an intermediate opening position, and the two-dot chain line position a is the maximum cooling position where the air passage of the heater core 14 is fully closed and the cold air bypass passage 23 is fully opened. . The two-dot chain line position a is a maximum heating position where the cold air bypass passage 23 is fully closed and the ventilation path of the heater core 14 is fully opened.

  As is well known, the air mix door 22 adjusts the air volume ratio between the warm air (arrow f) passing through the heat exchanging portion 14c of the heater core 14 and the cold air (arrow e) bypassing the heater core 14 and passing through the cold air bypass passage 23. Temperature adjusting means for adjusting the temperature of air blown into the passenger compartment. In the air mixing unit 27, the hot air (arrow f) and the cold air (arrow e) are mixed to obtain air having a desired temperature.

  On the other hand, a face opening 28 is opened on the vehicle rear side in the upper part of the case 11, and a defroster opening 29 is opened on the vehicle front side of the face opening 28. In the case 11, a face passage 30 extending in the upward direction from the air mixing portion 27 toward the face opening portion 28 is formed.

  A face door 31 that switches between the face opening 28 and the defroster opening 29 is disposed above the case 11. The face door 31 is composed of a plate door that is rotatably held on the case 11 by a rotating shaft 31a. The face opening 28 blows out air toward the occupant's face through a face duct (not shown). A defroster duct 32 is connected to the defroster opening 29, and air is blown out from the defroster outlet 32 a at the tip of the defroster duct 32 toward the inner surface of the vehicle front window glass.

  On the other hand, a foot passage 33 is formed above the warm air guide wall 25 in the case 11. The foot passage 33 is formed by a space surrounded by the case rear side surface 11a, the hot air guide wall 25, and a foot door 34 described later, and from the case rear side surface 11a to the face passage 30 side (vehicle). It is formed so as to protrude to the front side.

  Of the foot passage 33, the portion on the face passage 30 side opens entirely to the face passage 30 to form a foot opening 33 a. The foot opening 33 a is opened and closed by the foot door 34.

  The foot passage 33 is formed in the case so as to extend over the entire length in the case vehicle width direction, and side opening portions 33b are opened at both left and right end portions of the foot passage 33 in the vehicle width direction, that is, both left and right side portions of the case 11. ing. A foot duct (not shown) that hangs downward is connected to each of the side openings 33b on both the left and right sides, and air is blown out from the foot outlet at the lower end of the foot duct to the feet of the occupant. Yes.

  The rotating shaft 34a of the foot door 34 is disposed on the upper side of the foot passage 33 so as to extend in the direction perpendicular to the plane of FIG. 1 (vehicle width direction), and both ends of the rotating shaft 34a are bearing holes (on the side wall portion of the case 11). (Not shown) is held rotatably.

  The foot door 34 switches and opens and closes the foot opening 33a of the foot passage 33 and the face passage 30. The solid line position of the foot door 34 is a bi-directional opening that simultaneously opens both the foot opening 33a of the foot passage 33 and the face passage 30 to the same extent. Indicates the position in level mode or foot defroster mode.

  On the other hand, a two-dot chain line position c of the foot door 34 indicates a position in the face mode or the defroster mode in which the foot opening 33a of the foot passage 33 is fully closed and the face passage 30 is fully opened. A two-dot chain line position d of the foot door 34 indicates a foot mode position where the face passage 30 is fully closed and the foot opening 33a of the foot passage 33 is fully opened.

  The face door 31 and the foot door 34 constitute a blow mode switching door, and the rotary shafts 31a and 34a of the doors 31 and 34 are blown out via a link mechanism (not shown) outside the case 11. Connected to the operation mechanism, both the doors 31 and 34 are interlocked and rotated to a predetermined position by the blowing mode operation mechanism.

  Similarly, the rotating shaft 22a of the air mix door 22 is also connected to the temperature adjustment operation mechanism outside the case 11 via a link mechanism, and the rotation position (opening) of the air mix door 22 is adjusted by this temperature adjustment operation mechanism. Adjusted. These blowing mode operation mechanism and temperature adjustment operation mechanism may be configured by either an automatic operation mechanism using a servomotor or a manual operation mechanism using a manual operation force of an occupant.

  Next, the operation of this embodiment will be described based on the above configuration. In FIG. 1, when the electric motor of the blower unit 12 is energized and the centrifugal blower fan 12a is rotationally driven in the direction of the arrow g, the inside air or the outside air is sucked from an inside / outside air switching box (not shown). As a result, the air flows through the scroll casing 12b, flows in the vehicle front side region in the case 11 from the upper side to the lower side as indicated by the arrow a, and is supplied to the inflow surface 13g of the evaporator 13.

  FIG. 8 is an essential part enlarged cross-sectional view schematically showing the flow of wind on the inflow surface 13 g and the outflow surface 13 h of the evaporator 13. As shown in FIG. 8, the angle θ formed by the blown air a1 on the inflow surface 13g of the evaporator 13 and the inflow surface 13g is an acute angle.

  Since the main body portion 17 of the air blowing guide member 16 is disposed perpendicularly to the inflow surface 13g on the inflow surface 13g of the evaporator 13, the blown air a2 flowing in the vicinity of the inflow surface 13g of the blown air a1 is the air flow guide. When hitting the main body portion 17 of the member 16, the flow direction changes substantially perpendicular to the inflow surface 13g as shown by an arrow b1.

  The flow b1 substantially perpendicular to the inflow surface 13g flows into the heat exchanging portion 13e from the inflow surface 13g and is cooled in the process of passing through the air circulation space 13i, and then becomes cold air d1 flowing out to the outflow surface 13h side.

  The blown air a3 that flows away from the inflow surface 13g in the blown air a1 is pushed out in the direction further away from the inflow surface 13g (front of the vehicle) by the main body portion 17 of the blower guide member 16, and as shown by the arrow a4, It flows to the downstream side (vehicle lower side) substantially in parallel.

  As a result, the area 35 in the vicinity of the inflow surface 13g and on the downstream side (the vehicle lower side) from the blowing guide member 16 is an area where the flow velocity is very slow because the blowing air is not directly blown, in other words, the flow is slow. It becomes an area.

  Incidentally, in the region 36 on the outflow surface 13h side (vehicle rear side) of the evaporator 13 and through which the cool air d1 flows, the static pressure in the region 36 is lowered by the flow rate of the cool air d1. In other words, the region 36 has a negative pressure with respect to the region 35.

  Accordingly, the air in the region 35 is sucked toward the region 36 due to the pressure difference with the region 36, and flows into the heat exchanging portion 13e substantially perpendicular to the inflow surface 13g as indicated by the arrow b2. Then, after cooling in the process of passing through the air circulation space 13i, the cooling air d2 flows out to the outflow surface 13h side.

  As described above, the air blowing guide member 16 can make the direction of the air flow flowing into the heat exchanging portion 13e substantially perpendicular to the inflow surface 13g as indicated by arrows b1 and b2, so that the angle of attack α, that is, heat exchange can be achieved. The angle α formed between the direction b1 and b2 of the air flow flowing into the portion 13e and the extending direction (two-dot chain line i) of the edge portion 13f of the heat transfer fin 13d can be reduced.

  As a result, the blown air smoothly flows along the edge portion 13f of the heat transfer fin 13d, and the flow separation and the generation of the vortex v can be suppressed, so that wind noise can be reduced.

  As described above, the air blowing guide member 16 can be easily assembled and reduced in cost by integral molding. Therefore, it is possible to reduce wind noise in the air conditioning unit without increasing the cost.

  By the way, as shown in FIG. 1, the cool air d1 and d2 that pass through the heat exchanging portion 13e of the evaporator 13 to the rear side of the vehicle and are cooled and flow to the rear side of the vehicle are cooled by the opening of the air mix door 22, as shown in FIG. The cold air e passing through the bypass passage 23 and the hot air f passing through the heater core 14 are distributed, and the cold air e and the hot air f are mixed in the vicinity of the air mixing unit 27. Therefore, by adjusting the air volume ratio of the cold air e and the hot air f by the air mix door 22, air having a desired temperature is obtained in the air mixing unit 27.

  The air at the desired temperature is blown into a vehicle compartment from a predetermined outlet through an opening mode switching mechanism (not shown) that opens and closes the outlet mode switching door according to the set outlet mode.

  When the face mode is set, the face door 31 is operated to a solid line position where the face opening portion 28 is fully opened and the defroster opening portion 29 is fully closed by the blowing mode operation mechanism. At the same time, the foot door 34 is operated to the two-dot chain line position c by the blowing mode operation mechanism, and the foot opening 33 a of the foot passage 33 is fully closed and the face passage 30 is fully opened.

  Accordingly, the conditioned air adjusted to a desired temperature by the air mix door 22 (face mode is mainly cold air) passes through the face passage 30 from the air mixing unit 27 and flows into the face opening 28, and this face opening 28 To the passenger's face side to cool the passenger compartment.

  Next, when the bi-level mode is set, the face door 31 and the foot door 34 are moved to the solid line positions in FIG. 1 by the blowing mode operation mechanism (not shown), and the foot door 34 is operated to the intermediate opening position. Both the foot opening 33a of the passage 33 and the face passage 30 are simultaneously opened to the same extent.

  Accordingly, a part of the conditioned air whose temperature is adjusted by the air mix door 22 passes through the face passage 30 from the air mixing unit 27 and blows out from the face opening 28 to the occupant's face side, and at the same time, the remaining conditioned air is air. The mixing portion 27 flows into the foot opening 33a and the foot passage 33, and further flows from the foot passage 33 to the side opening 33b located on both the left and right side portions of the case 11, and the conditioned air flows from the side opening 33b to the passenger. Blow out to the feet.

  Next, when the foot mode is set, the foot door 34 becomes the position indicated by the two-dot chain line in FIG. 1, the foot door 34 fully opens the foot opening 33 a of the foot passage 33, and fully closes the face passage 30. For this reason, the air whose temperature is adjusted by the air mixing unit 27 is blown out only to the feet of the occupant through the foot opening 33a, the foot passage 33, and the side surface opening 33b.

  Next, when the foot defroster mode is set, the face door 31 is in the position indicated by the two-dot chain line in FIG. 1, the face opening 28 is fully closed, and the defroster opening 29 is fully opened. Further, the foot door 34 is in the position indicated by the solid line in FIG. 1, and both the foot opening 33 a of the foot passage 33 and the face passage 30 are simultaneously opened to the same extent. As a result, the air whose temperature is adjusted by the air mixing unit 27 is blown out to the vehicle window glass side through the face passage 30 and the defroster opening 29 to prevent the vehicle window glass from being fogged. At the same time, the air whose temperature is adjusted by the air mixing unit 27 is blown out to the feet of the occupant through the foot opening 33a, the foot passage 33, and the side surface opening 33b, thereby heating the occupant's feet.

  Next, when the defroster mode is set, the face door 31 is in the position indicated by the two-dot chain line in FIG. 1, the face opening 28 is fully closed, and the defroster opening 29 is fully opened. Further, the foot door 34 becomes the two-dot chain line position c in FIG. 1, the foot opening 33 a of the foot passage 33 is fully closed, and the face passage 30 is fully opened. As a result, the entire amount of air whose temperature has been adjusted by the air mixing unit 27 is blown out to the vehicle window glass side through the face passage 30 and the defroster opening 29 to prevent the vehicle window glass from being fogged.

(Second Embodiment)
In the said 1st Embodiment, although the main-body part 17 of the ventilation guide member 16 is formed in the substantially rectangular flat plate shape, as shown to Fig.9 (a) thru | or (c), the ventilation guide member 16 is shown in this embodiment. The main body portion 17 is formed in a plate shape having a substantially “cross-shaped” cross section having a refracting portion 17 a in its cross section.

  FIG. 9A is a front view of the air blowing guide member 16 in the present embodiment, FIG. 9B is a view taken along the arrow I in FIG. 9A, and FIG. 9C is J in FIG. 9B. It is an arrow view.

  Of the substantially “U” shape of the main body portion 17, a vertical surface 17 b perpendicular to the inflow surface 13 g of the evaporator 13 is provided on the root side of the refraction portion 17 a, in other words, on the inflow surface 13 g side of the heat exchange portion 13 e. Is formed. An inclined surface 17c that is inclined with respect to the vertical surface 17b is formed on the distal end side of the refracting portion 17a in the substantially "<" shape of the main body portion 17.

  In the present embodiment, as in the first embodiment, the air guide member 16 including the main body portion 17, the column portion 18, the seat surface portion 19, and the claw portion 20 can be integrally formed of a resin material. Assembling work is facilitated, and the cost of the air guide member 16 can be reduced.

  FIG. 10 is an essential part enlarged cross-sectional view schematically showing the flow of wind on the inflow surface 13g and the outflow surface 13h of the evaporator 13 in the present embodiment. As shown in FIG. 10, the vertical surface 17b of the main body portion 17 of the air blowing guide member 16 is disposed perpendicular to the inflow surface 13g of the heat exchanging portion 13e, and the inclined surface 17c is below the vertical surface 17b, in other words. If it is, it arrange | positions in the downstream of blowing air a1.

  In the present embodiment, by disposing the inclined surface 17c on the downstream side of the vertical surface 17b, the action of pushing the blown air a3 that flows away from the inflow surface 13g in a direction further away from the inflow surface 13g (front of the vehicle) is the first. It becomes stronger than one embodiment. In view of this point, the air guide member 16 is disposed at an appropriate position in the vertical direction of the evaporator 13 (longitudinal direction of the tube 13c).

  Next, the operation of this embodiment will be described based on the above configuration. Of the blown air a1 on the inflow surface 13g of the evaporator 13, the blown air a2 flowing in the vicinity of the inflow surface 13g hits the vertical surface 17b of the main body portion 17 of the blower guide member 16, and is substantially the same as the inflow surface 13g as shown by the arrow b1. It flows vertically into the heat exchange part 13e. Then, after cooling in the process of passing through the air circulation space 13i, the cooling air d1 flows out to the outflow surface 13h side.

  The blown air a3 that flows away from the inflow surface 13g in the blown air a1 is pushed further in the direction further away from the inflow surface 13g (front of the vehicle) by the inclined surface 17c of the main body portion 17 of the blower guide member 16, as indicated by an arrow a4. , Flows substantially parallel to the inflow surface 13g. Here, as described above, the action of pushing the blown air a3 in a direction further away from the inflow surface 13g (front of the vehicle) is stronger than that in the first embodiment.

  Thereby, in the area | region 35 of the inflow surface 13g vicinity and the downstream (vehicle lower side) rather than the ventilation guide member 16, since blowing air is not directly blown, it becomes a so-called area where the flow velocity is very slow.

  The air in the region 35 is sucked toward the region 36 by the negative pressure in the region 36, and flows into the heat exchanging portion 13e perpendicularly to the inflow surface 13g and passes through the air circulation space 13i as indicated by the arrow b2. After being cooled, the cold air d2 flows out to the outflow surface 13h side.

  Thus, also in the present embodiment, as in the first embodiment, the air flow direction flowing into the heat exchanging portion 13e is substantially perpendicular to the inflow surface 13g by the air blowing guide member 16 as indicated by arrows b1 and b2. Since the direction can be made, the angle of attack α can be reduced. As a result, the blown air smoothly flows along the edge portion 13f of the heat transfer fin 13d, and the flow separation and the generation of the vortex v can be suppressed, so that wind noise can be reduced.

  As described above, as with the first embodiment, the air blowing guide member 16 in the present embodiment facilitates assembling work and reduces costs by integral molding. Therefore, it is possible to reduce wind noise in the air conditioning unit without increasing the cost.

(Other embodiments)
In addition, the shape of the main-body part 17 of the ventilation guide member 16 is not limited to the shape of the said embodiment. For example, the direction of the blowing guide member 16 of the second embodiment is turned upside down so that the inclined surface 17c of the main body 17 is disposed above the vertical surface 17b, in other words, upstream of the blowing air a1. Good.

  In this embodiment, by disposing the inclined surface 17c on the upstream side of the vertical surface 17b, the flow direction of the blown air a2 flowing in the vicinity of the inflow surface 13g is changed substantially perpendicular to the inflow surface 13g. It becomes stronger than the first embodiment. In view of this point, the air guide member 16 is disposed at an appropriate position in the vertical direction of the evaporator 13 (longitudinal direction of the tube 13c).

  Moreover, the shape of the main-body part 17 of the ventilation guide member 16 may be, for example, a plate shape having a plurality of refracting portions 17a or a curved plate shape.

  Moreover, the shape of the main body portion 17 of the air blowing guide member 16 is not limited to a plate shape, and may be a net shape covering the entire or part of the inflow surface 13g of the heat exchanging portion 13e.

  Moreover, in the said embodiment, although the one ventilation guide member 16 is arrange | positioned, you may arrange several ventilation guide members 16. FIG.

  Moreover, in the said embodiment, although the ventilation guide member 16 is hold | maintained at the evaporator 13 by the column part 18 and the nail | claw part 20, the nail | claw part 20 is abolished and the ventilation guide member 16 is only evaporator by the column part 18. 13 may be held.

  Moreover, in the said embodiment, although the seat surface part 19 of the ventilation guide member 16 is made to protrude in the step shape from the root part of the pillar part 18, arrangement | positioning and shape of the seat surface part 19 are limited to arrangement | positioning and shape of the said embodiment. It is not something. For example, the seat surface portion 19 may be protruded from the portion other than the root portion of the column portion 18 to the inflow surface 13 g side of the evaporator 13.

  The cooling heat exchanger according to the present invention is not limited to the evaporator 13 of the above embodiment, and the present invention is widely applied to a known cooling heat exchanger having a laminated structure of tubes and heat transfer fins. Applicable.

It is a longitudinal cross-sectional view which shows the vehicle air conditioning unit in 1st Embodiment of this invention. It is the figure which showed only the evaporator part by A arrow view in FIG. It is BB sectional drawing in FIG. It is the C section enlarged view in FIG. (A) is an enlarged view of the ventilation guide member in FIG. 2, (b) is an E arrow view in (a), (c) is an F arrow view in (b). (A) is the G section enlarged view in FIG.5 (b), (b) is the H arrow directional view in (a). It is an enlarged view of the column part and heat-transfer fin in the DD cross section of FIG. 4 and FIG. It is a principal part expanded sectional view which shows typically the flow of the wind in 1st Embodiment of this invention. (A) is a front view of the ventilation guide member in 2nd Embodiment of this invention, (b) is an I arrow directional view in (a), (c) is a J arrow directional view in (b). . It is a principal part expanded sectional view which shows typically the flow of the wind in 2nd Embodiment of this invention. It is a principal part expanded sectional view which shows the vehicle air conditioning unit of a prior art. FIG. 12 is a diagram showing only the evaporator section as viewed in the direction of arrow K in FIG. 11.

Explanation of symbols

13 ... Evaporator (cooling heat exchanger), 13c ... Tube, 13d ... Heat transfer fin,
13e ... heat exchange part, 13g ... inflow surface, 13i ... air circulation space, 13j ... side plate,
16 ... Air blow guide member, 17 ... Main body part, 18 ... Column part, 19 ... Seat surface part, 20 ... Claw part,
21 ... Gap.

Claims (6)

A case (11) that forms an air passage through which air flows toward the passenger compartment;
A cooling heat exchanger (13) disposed in the case (11) for cooling the air,
The cooling heat exchanger (13) includes a heat exchanger (13e) having a laminated structure of a tube (13c) through which a refrigerant fluid flows and a heat transfer fin (13d) joined to the tube (13c). Have
The blown air (a1) flowing in the case (11) is blown at an acute angle toward the inflow surface (13g) of the heat exchange part (13e),
In the vehicle air conditioner in which a blowing guide member (16) for guiding the flow of the blown air (a1) is arranged on the inflow surface (13g),
A body part (17) for guiding the flow of the blown air (a1) and a column part (18) protruding toward the inflow surface (13g) are integrally formed on the air blowing guide member (16),
The vehicle air conditioner, wherein the column portion (18) is inserted and held in an air circulation space (13i) formed by being surrounded by the tube (13c) and the heat transfer fin (13d). The body portion (17) is integrally formed with a seat surface portion (19) in contact with the inflow surface (13g),
The vehicle air conditioner according to claim 1, wherein a gap (21) having a predetermined size is formed between the main body portion (17) and the inflow surface (13g) by the seat surface portion (19). apparatus. The vehicle air conditioner according to claim 2, wherein the seat surface portion (19) is disposed at a base portion of the column portion (18). A side plate (13j) is arranged on the outer side in the stacking direction of the tube (13c) and the heat transfer fin (13d) of the heat exchange part (13e),
The air blowing guide member (16) is disposed over the entire length in the stacking direction of the heat exchange part (13e),
The claw portion (20) that engages with the side plate (13j) is integrally formed at both ends in the stacking direction of the air blowing guide member (16). The vehicle air conditioner described in 1. The vehicle air conditioner according to any one of claims 1 to 4, wherein only one air blowing guide member (16) is disposed on the inflow surface (13g). The main body (17) has a plate shape that changes the flow direction of the blown air (a1) from an acute angle to the inflow surface (13g) to a direction substantially perpendicular to the inflow surface (13g). The vehicle air conditioner according to any one of claims 1 to 5, wherein the vehicle air conditioner is formed.

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