JP2012183865A - Air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain air conditioned wind of a desired temperature by suitably mixing cold wind and warm wind in an air mix space.SOLUTION: An air mix damper 40 includes: a rotation shaft 40a supported by a casing 50 so as to be freely rotated; a cold air side blocking plate 40b which extends in a radial direction from the rotation shaft 40a to open and close a cold air passage 60; and a warm wind side blocking plate 40c which extends in a radial direction from the rotation shaft 40a to open and close a warm wind passage 61. A cold air guide part 40e to guide the cold air to the air mix space 62 is formed on an extending direction tip side of the cold air side blocking plate 40b. A step part 40f for separating the cold air guided by the cold air guide part 40e from the cold air side blocking plate 40b is formed on a base end side from the cold air guide part 40e of the cold air side blocking plate 40b. A facing plane part 69a facing the cold air guide part 40e of the air mix damper 40 is formed in a peripheral edge part of a downstream edge aperture of the cold air passage 60 in the casing 50.

Description

  The present invention relates to a vehicle air conditioner mounted on a vehicle such as an automobile.

  2. Description of the Related Art Conventionally, as a vehicle air conditioner, one configured to obtain air conditioned air having a desired temperature by separately generating and mixing cold air and hot air is known (see, for example, Patent Document 1). .

  In the casing of the vehicle air conditioner of Patent Document 1, a cold air passage in which a cooling heat exchanger is arranged, a hot air passage in which a heating heat exchanger is arranged, and a cold air passage and a downstream end of the hot air passage An air mix space to which the opening is connected is formed. An air mix damper that opens and closes the cold air passage and the downstream end opening of the hot air passage is disposed in the casing. Further, a bypass passage is formed in the casing for bypassing the air without passing through the heat exchanger for heating.

  The air mix damper is provided with a ventilation amount adjustment guide for adjusting the ventilation amount of the bypass passage. The air flow adjustment guide is moved according to the opening of the air mix damper to control the air flow in the bypass passage, thereby changing the amount of cold air and hot air flowing into the air mix space to change the air flow at the desired temperature. Like to get. And the obtained conditioned air blows off from a vent outlet, a defroster outlet, and a foot outlet to a vehicle compartment from a desired outlet.

JP 2006-168432 A

  The flow of air in the casing is greatly different between a small air volume and a large air volume. Moreover, in the vehicle air conditioner, the air-conditioning air can be switched to various blowing modes such as a mode in which the conditioned air is blown out only from the vent outlet or a mode in which only the defroster outlet is blown out. Is different.

  However, in Patent Document 1, the air mix damper is provided with a ventilation amount adjustment guide for adjusting the ventilation amount of the bypass passage, and the flow rate of the cold air that bypasses the heat exchanger for heating is changed according to the opening degree of the air mix damper. As a result, only a general temperature adjustment of changing the amount of cold air flowing into the air mix space and the amount of hot air is performed, and therefore the flow of air in the casing When air volume changes variously, the case where mixing of the cool air and warm air in an air mix space cannot be made favorable is considered.

  This invention is made | formed in view of this point, The place made into the objective is that mixing of the cool air and warm air in an air mix space is made favorable, and it can obtain the conditioned air of desired temperature. Is to make it.

  In order to achieve the above object, according to the present invention, the flow of the cold air is rectified, and the flow velocity of the cold air is increased to flow toward the air mix space. Was peeled off from the air mix damper to widen the contact area between the cold air and the hot air.

  A first invention is a casing in which a cooling heat exchanger and a heating heat exchanger, and the cooling and heating heat exchangers are accommodated, and an inlet for air conditioning air and an outlet for air conditioning air are formed. In the casing, the cooling heat exchanger is disposed to cool the air-conditioning air, and the heating air exchanger is disposed to heat the air-conditioning air. An air mix space connected to the downstream side of the cold air passage and the hot air passage and connected to the outlet is formed, and the amount of cold air and the amount of hot air flowing into the air mix space are adjusted. In the vehicle air conditioner provided with an air miss damper for the air mix damper, the air mix damper includes a rotation shaft that is rotatably supported by the casing, and a radial passage extending from the rotation shaft to the cold air passage. Cold air to open and close A closing plate and a hot air side closing plate that extends in a radial direction from the rotating shaft to open and close the hot air passage, and the cold air is supplied to the front end side in the extending direction of the cold air side closing plate. A cold air guide portion for guiding to the air mix space is formed, and the cold air guided by the cold air guide portion is separated from the cold air side obstruction plate at a base end side of the cold air guide portion of the cold air obstruction plate. A step portion for the cooling air passage is formed so as to be recessed toward the cold air passage side, and an opposing surface portion facing the cold air guide portion of the air mix damper is formed at the peripheral edge of the downstream end opening of the cold air passage in the casing. It is characterized by.

  According to this configuration, when the air mix damper is in a rotational position that opens both the cold air passage and the hot air passage, the cold air flows from the cold air passage into the air mix space, and the hot air passes from the hot air passage to the air mix space. The cool air and the warm air are mixed in the air mix space.

  At this time, the cool air passes between the cool air guide portion of the air mix damper and the facing surface portion of the casing, but the facing surface portion extends along the cool air guide portion, thereby increasing the flow rate of the cool air. At the same time, the cold air is rectified. This cold air is guided to the air mix space by the cold air guide. On the way, when the cold air flows through the portion corresponding to the step portion of the air mix damper, the flow of the cold air peels from the air mix damper. Since the cold air flowing through the portion corresponding to the step portion of the air mix damper is rectified as described above and is in a high flow rate state, even if the air flow in the casing varies, the air mix damper Peel surely.

  When the flow of the cold air is separated from the air mix damper, the hot air easily enters between the cold air and the air mix damper. Thereby, since the contact part of cold air and warm air becomes large, mixing of cold air and warm air in an air mix space can be performed satisfactorily.

  According to a second invention, in the first invention, the cold air guide portion of the air mix damper is formed in a flat plate shape, and the opposed surface portion of the casing has a hot air flow rate at which the rotational position of the air mix damper is adjusted to the degree of opening of the cold air passage. When the position is smaller than the opening of the passage, it is formed so as to have a space between the cold air guide portion and along the direction in which the cold air guide portion extends. Is.

  According to this configuration, when the cool air passes between the cool air guide portion of the air mix damper and the opposed surface portion of the casing, the effect of rectifying the cool air is enhanced.

  A third invention is characterized in that, in the first or second invention, the wall portion of the step portion of the air mix damper is substantially orthogonal to the direction of cold air guided by the cold air guide portion.

  According to this configuration, since the cold air guiding direction and the wall portion of the step portion are substantially orthogonal, the cold air guided by the cold air guiding portion is reliably separated from the air mix damper.

  According to a fourth invention, in any one of the first to third inventions, the air mix damper is provided with a hot air guide plate for guiding the hot air to the air mix space. It is.

  According to this configuration, it is possible to guide the warm air blown out from the warm air passage to any part of the air mix space by the warm air guide plate of the air mix damper.

  According to the first aspect of the invention, the cold air guide block and the step for separating the flow of the cold air from the cold air guide portion are formed on the cold air side blocking plate of the air mix damper, and the casing faces the cold air guide portion. Since the opposing surface portion is formed, the cool air is rectified to increase the flow velocity of the cool air and guided to the air mix space, and the flow of the cool air can be reliably separated from the air mix damper in the middle. Thereby, the contact part of cold air and warm air can be widened, the cold air and warm air can be mixed well in the air mix space, and conditioned air at a desired temperature can be obtained.

  According to the second invention, the cold air guide portion of the air mix damper is formed in a flat plate shape, and the opposing surface portion of the casing is formed so as to extend along the direction in which the cold air guide portion extends. Thereby, the cold wind which flows through the part corresponding to a step part can be reliably peeled from an air mix damper.

  According to the third invention, since the wall portion of the step portion of the air mix damper is substantially orthogonal to the direction of the cold air guided by the cold air guide portion, the cold air can be reliably peeled from the air mix damper, Mixing of cool air and warm air in the air mix space can be performed even better.

  According to the fourth aspect of the invention, since the warm air guide plate for guiding the warm air to the air mix space is provided in the air mix damper, the warm air can be guided to any part in the air mix space. . Thereby, for example, relatively high-temperature conditioned air can be sent to the defroster outlet, and it is possible to easily cope with the case where it is desired to provide a temperature difference of the conditioned air depending on the part of the passenger compartment.

It is a figure which shows the internal structure of the vehicle air conditioner concerning embodiment. It is the figure which looked at the extension board part vicinity from the lower side. It is a perspective view of the air mix damper which abbreviate | omitted the sealing material. It is a top view of the air mix damper which abbreviate | omitted the sealing material. It is a side view of the air mix damper which abbreviate | omitted the sealing material. It is the figure which looked at the air mix damper which abbreviate | omitted the sealing material from the warm air side. It is the VII-VII sectional view taken on the line in FIG. FIG. 2 is a view corresponding to FIG. 1 during maximum cooling. FIG. 2 is a view corresponding to FIG. 1 during maximum heating. It is an expanded sectional view of the air mix damper which opened the cold wind side small, and its neighborhood.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

  FIG. 1 is a diagram showing an internal structure of a vehicle air conditioner 1 according to an embodiment of the present invention. For example, the vehicle air conditioner 1 is housed in an instrument panel (not shown) in a passenger compartment of an automobile.

  In the description of this embodiment, the front side of the vehicle is simply referred to as “front”, the rear side of the vehicle is simply referred to as “rear”, the left side of the vehicle is simply referred to as “left”, and the right side of the vehicle is simply referred to as “right”. To do.

  The vehicle air conditioner 1 includes an air conditioning unit 10 and a blower unit 20 (shown in phantom lines). Although not shown, the blower unit 20 includes a blower and an inside / outside air switching unit. The blower is provided with a fan and a motor for driving the fan, and the amount of blown air can be arbitrarily changed. The inside / outside air switching unit includes an inside air introduction port that introduces air inside the vehicle interior and an outside air introduction port that introduces air outside the vehicle interior, and by opening one of them and closing the other, It can be switched between outside air and introduced.

  The air conditioning unit 10 accommodates an evaporator (cooling heat exchanger) 30, a heater core (heating heat exchanger) 35, an air mix damper 40, a defroster damper 41, a vent damper 42, and a heat damper 43. A casing 50 is provided, and the temperature of the air blown from the blower unit 20 is adjusted to obtain conditioned air, which is then supplied to each part of the passenger compartment.

  In this embodiment, a case where the automobile is a right-hand drive car will be described. That is, the blower unit 20 is mounted on the left side in the instrument panel, and the air conditioning unit 10 is mounted on the right side of the blower unit 20 at the center in the vehicle width direction. The air conditioning unit 10 and the blower unit 20 are connected by an intermediate duct (not shown).

  The casing 50 is made of a resin material and is divided into two at a substantially central portion in the left-right direction. FIG. 1 is a view of the left side member of the casing 50 to which the evaporator 30 and the like are assembled as viewed from the right side.

  An inlet 51 for introducing air for air conditioning into the casing 50 is formed in the front portion of the left side wall portion of the casing 50. The introduction port 51 is connected to the downstream side of the intermediate duct.

  A defroster outlet 52 is formed at the center in the front-rear direction of the upper wall portion of the casing 50. The defroster outlet 52 is connected to a defroster port of the instrument panel via a defroster duct (not shown). The defroster port is for supplying conditioned air to the inner surface of the front window.

  A vent outlet 53 is formed in front of the defroster outlet 52 in the upper wall portion of the casing 50. The vent outlet 53 is connected to the vent opening of the instrument panel via a vent duct (not shown). The vent opening is mainly for supplying conditioned air to the upper body of the occupant.

  A front heat outlet 54 is formed near the lower portion of the casing 50. The front heat outlet 54 is for supplying conditioned air to the feet of the front seat occupant via a front heat duct (not shown).

  A rear heat outlet 55 is formed below the front heat outlet 54 of the casing 50. The rear heat outlet 55 is for supplying conditioned air to the feet of the rear seat occupant via a rear heat duct (not shown).

  In the casing 50, a cold air passage 60 that generates cold air, a hot air passage 61 that generates hot air, an air mix space 62 that mixes cold air and hot air, and a heat passage 63 are formed.

  The cold air passage 60 extends rearward from the front portion in the casing 50. The upstream end of the cold air passage 60 is connected to the introduction port 51. In the middle of the cold air passage 60, the evaporator 30 is arranged. The evaporator 30 constitutes an evaporator of a well-known refrigeration cycle, and is constituted by a tube and fin type heat exchanger. The evaporator 30 is placed vertically so that the tubes extend substantially vertically, and the tubes and fins are arranged in the left-right direction. Therefore, the evaporator 30 is positioned so as to cross the cold air passage 60. Air-conditioning air flowing through the cold air passage 60 is cooled by passing through the evaporator 30.

  The downstream end of the cold air passage 60 is branched into two vertically. The upper opening 60 a at the downstream end of the cold air passage 60 is connected to the air mix space 62, and the lower opening 60 b is connected to the upstream end of the hot air passage 61.

  The hot air passage 61 is formed on the rear side of the cold air passage 60. That is, a partition wall 66 for partitioning the inside of the casing 50 into a cold air passage 60 and a hot air passage 61 is formed in the casing 50. The partition wall 66 is connected to the bottom wall portion of the casing 50 and extends upward. The lower opening 60 b is formed so as to penetrate the upper half of the partition wall 66.

  The hot air passage 61 extends downward from the lower opening 60b of the cold air passage 60 and then extends in a substantially U shape so as to curve upward. The lower opening 60 b of the cold air passage 60 and the downstream end opening 61 a of the hot air passage 61 are close to each other. Further, the downstream end opening 61 a of the hot air passage 61 is located above the lower opening 60 b of the cold air passage 60.

  A heater core 35 is disposed in the middle of the warm air passage 61. The heater core 35 circulates engine cooling water, and is composed of a tube-and-fin type heat exchanger. The heater core 35 is inclined so that its upper end is located on the rear side of the lower end, and is arranged so as to cross the warm air passage 61. The air-conditioning air flowing through the hot air passage 61 is heated by passing through the heater core 35.

  The air mix space 62 is formed in the upper part in the casing 50. In other words, a partition wall 67 that partitions the inside of the casing 50 is provided in the upper part of the casing 50. The partition wall 67 extends substantially in the front-rear direction and is inclined downward toward the rear side. The upper opening 60 a of the cold air passage 60 and the downstream end opening 61 a of the hot air passage 61 penetrate the partition wall 67.

  Cold air is blown out from the upper opening 60 a of the cold air passage 60 into the air mix space 62, and hot air is blown out from the downstream end opening 61 a of the hot air passage 61.

  A defroster air outlet 52 communicates with the upper front side of the air mix space 62, a vent air outlet 53 communicates with the upper rear side of the air mix space 62, and a lower rear side of the air mix space 62. The upstream end of the heat passage 63 communicates.

  The heat passage 63 is formed to extend in the vertical direction along the rear wall portion of the casing 50. A front heat outlet 54 and a rear heat outlet 55 communicate with the heat passage 63.

  The defroster damper 41 is a butterfly damper for opening and closing the defroster outlet 52, a rotation shaft 41 a that is rotatably supported by the casing 50, and closing plates 41 b and 41 b for closing the defroster outlet 52. And sealing materials 41c and 41c. The rotation shaft 41a extends in the left-right direction. The blocking plates 41b and 41b extend in the radial direction of the rotation shaft 41a. The sealing materials 41c and 41c are attached to the peripheral portions of the closing plates 41b and 41b, respectively. For example, urethane foam is preferable as the sealing materials 41c and 41c.

  The vent damper 42 is a butterfly damper for opening and closing the vent outlet 53 and, like the defroster damper 41, includes a rotating shaft 42a, blocking plates 42b and 42b, and sealing materials 42c and 42c.

  The heat damper 43 is a butterfly damper for opening and closing the heat passage 63 and, like the defroster damper 41, includes a rotating shaft 43a, blocking plates 43b and 43b, and sealing materials 43c and 43c.

  The defroster damper 41, the vent damper 42, and the heat damper 43 are driven by an actuator via a link mechanism (not shown). For example, the defroster mode in which the defroster damper 41 is open and the vent damper 42 and the heat damper 43 are closed, the vent mode and the heat damper 43 in which the vent damper 42 is open and the defroster damper 41 and the heat damper 43 are closed The defroster damper 41 is open, and the vent damper 42 is closed, and a plurality of blowing modes such as a heat mode can be switched.

  Note that the blowout mode is not limited to the above, and the differential / heat mode for blowing from the defroster blowout port 52, the front heat blowout port 54, and the rear heat blowout port 55, the vent blowout port 53, the front heat blowout port 54, and the rear heat blowout port. It can also be switched to the bi-level mode that blows out from the outlet 55.

  In addition to the actuator, the defroster damper 41, the vent damper 42, and the heat damper 43 may be directly operated by an occupant's operating force, for example, via an operation wire that extends to the air conditioning control panel of the passenger compartment.

  The upper opening 60a of the cold air passage 60 has a substantially rectangular shape that is long in the left-right direction. In the vicinity of the front edge of the upper opening 60a in the partition wall 67, a protrusion 67a that protrudes downward and extends in the left-right direction is formed. As will be described later, a sealing material 40d of the air mix damper 40 comes into contact with the protrusion 67a.

  As shown in FIG. 2, an extension plate portion 69 that extends rearward (inward of the upper opening 60 a) is formed at the front edge portion of the upper opening 60 a in the partition wall 67. The extension plate portion 69 is formed across the left and right ends of the upper opening 60a, and as shown in FIG. 1, is inclined downward toward the front end side (rear side) in the extension direction. As shown in FIG. 2, the left and right sides of the extension plate portion 69 extend greatly inward of the upper opening 60 a as compared with the other portions.

  As shown in FIG. 1, a curved plate portion 70 extending downward is connected to the front side of the protrusion 67 a of the partition wall 67. The curved plate portion 70 is located between the air mix damper 40 and the evaporator 30 and is curved so as to follow the rotation trajectory of the air mix damper 40.

  The air mix damper 40 is for changing the amount of cold air flowing into the air mix space 62 and the amount of hot air, and opens and closes the upper opening 60 a of the cold air passage 60 and the downstream end opening 61 a of the hot air passage 61. This is a butterfly damper.

  That is, as shown in FIGS. 3 to 7, the air mix damper 40 includes a rotating shaft 40 a, a cold air side blocking plate 40 b for closing the upper opening 60 a of the cold air passage 60, and a downstream end of the hot air passage 61. A hot air side blocking plate 40c for closing the opening 61a, and seal members 40d and 40d that are attached only to the peripheral portions of the cold air side closing plate 40b and the warm air side closing plate 40c are provided.

  The rotation shaft 40a extends in the left-right direction and is supported by the left and right side walls of the casing 50 so as to be rotatable. The cold air side blocking plate 40b extends in the radial direction of the rotating shaft 40a. Further, the hot air side blocking plate 40c also extends in the radial direction of the rotating shaft 40a. As shown in FIG. 5, the hot air side closing plate 40c and the cold air side closing plate 40b have mutually extending lines. It is located so as to intersect with a predetermined angle.

  Further, as shown in FIG. 1, the rotation shaft 40 a of the air mix damper 40 is located immediately above the heater core 35. A gap S is formed between the air mix damper 40 and the upper portion of the heater core 35.

  The air mix damper 40 is driven by an actuator (not shown). As shown in FIG. 8, when the rotating position of the air mix damper 40 is at a position where the cold air side closing plate 40 b fully opens the upper opening 60 a of the cold air passage 60, the hot air side closing plate 40 c is moved to the hot air passage 61. The downstream end opening 61a is fully closed. The rotation position of the air mix damper 40 at this time is the maximum cooling position. When the air mix damper 40 is in the maximum cooling position, the cold air side blocking plate 40 b fully closes the lower opening 60 b of the cold air passage 60. Thereby, it is possible to prevent the hot air in the hot air passage 61 from being sucked into the cold air passage 60.

  As shown in FIG. 9, when the rotation position of the air mix damper 40 is at a position where the hot air side closing plate 40 c fully opens the downstream end opening 61 a of the hot air passage 61, the cold air side closing plate 40 b is The upper opening 60a of the cold air passage 60 is positioned to be fully closed. The rotation position of the air mix damper 40 at this time is the maximum heating position. When the air mix damper 40 is in the maximum heating position, the warm air side blocking plate 40c fully closes the gap S between the air mix damper 40 and the heater core 35.

  The rotation position of the air mix damper 40 is changed by a set temperature or the like by the occupant, and can be stopped at an arbitrary position between the maximum cooling position shown in FIG. 8 and the maximum heating position shown in FIG. ing.

  In addition to the actuator, the air mix damper 40 may be directly operated by an occupant's operating force via an operation wire extending to an air conditioning control panel of the passenger compartment, for example, although not shown.

  A plate-like cold air guide portion 40e for guiding the cold air to the air mix space 62 is formed on the front end side of the cold air side blocking plate 40b. The cold air guide portion 40e extends over both ends of the air mix damper 40 in the left-right direction. As shown in FIG. 8, the cold air guide 40e faces the lower surface (opposite surface) 69a of the extension plate 69 when the air mix damper 40 reaches the maximum cooling position, and the air as shown in FIG. Even when the mix damper 40 is in a position where the upper opening 60 a of the cold air passage 60 is opened slightly, the mix damper 40 faces the lower surface 69 a of the extension plate portion 69.

  Specifically, when the rotation position of the air mix damper 40 is at a position where the opening degree of the upper opening 60 a of the cold air passage 60 is made smaller than the opening degree of the downstream end opening 61 a of the hot air passage 61, the cold air guide is provided. The portion 40e faces the lower surface 69a of the extending plate portion 69, and at this time, a space is formed between the cold air guide portion 40e and the lower surface 69a of the extending plate portion 69.

  The air mix damper 40 is formed with a step portion 40f that is recessed downward from the cold air side closing plate 40b to the hot air side closing plate 40c. The gap S is formed between the upper portion of the heater core 35 and the step portion 40f so that the step portion 40f and the heater core 35 do not interfere with each other.

  As shown in FIG. 7, the cold air side wall portion (cold air side wall portion) 40g constituting the step portion 40f is connected to the rear edge portion of the cold air guide portion 40e, and in a direction substantially orthogonal to the cold air guide portion 40e. It extends. As described above, the cold air side wall portion 40g of the step portion 40f is substantially orthogonal to the cold air guide portion 40e and is connected to the edge of the cold air guide portion 40e, so that the air mix space 62 along the cold air guide portion 40e. The flow of the cold air that has flown so as to be guided to the air will peel off from the cold air side blocking plate 40b in the middle. That is, the stepped portion 40f is for peeling the cold air guided by the cold air guide portion 40e from the cold air side blocking plate 40b.

  The warm air side wall portion (warm air side wall portion) 40h constituting the step portion 40f is formed in an arc shape extending in the rotation direction of the rotation shaft 40a. Further, an intermediate wall 40i between the cold air side wall 40g and the hot air side wall 40h in the stepped portion 40f extends substantially flat so as to connect both wall portions 40g and 40h. The intermediate wall portion 40i is formed so that the stepped portion 40f becomes deeper as it approaches the warm air side wall portion 40h. Further, the intermediate wall portion 40i guides the warm air blown out from the warm air passage 61 to the cold air side wall portion 40g during air mixing described later.

  As shown in FIG. 3, the air mix damper 40 is provided with two hot air guide plates 76 and 76 for guiding the hot air to the air mix space 62. These two hot air guide plates 76 and 76 have the same shape as each other, and are arranged at intervals in the direction of the rotation shaft 40 a of the air mix damper 40. Moreover, the warm air guide plates 76 and 76 are also separated from the left and right inner surfaces of the step portion 40f.

  Each hot air guide plate 76 is integrally formed on the inner surface of the stepped portion 40f and protrudes outward (upward) from the stepped portion 40f as a whole. Each hot air guide plate 76 includes a pair of side plate portions 76a and 76a and a connecting plate portion 76b for connecting the side plate portions 76a and 76a. Both side plate portions 76a, 76a extend in a direction orthogonal to the rotation shaft 40a, and are substantially parallel to each other in the same shape. As shown also in FIG. 1, the warm air side of the upper edge part of the side plate part 76a is gently curved.

  The connecting plate portion 76b connects the edge portions on the cold air side wall portion 40g side of the side plate portions 76a and 76a. As shown in FIGS. 3 and 4, the connecting plate portion 76 b is formed such that the center portion in the width direction (the axial direction of the rotating shaft 40 a) protrudes most toward the cold air side.

  Next, the case where the vehicle air conditioner 1 configured as described above is in an operating state will be described.

<At maximum cooling>
As shown in FIG. 8, at the time of the maximum cooling, the blowing mode is basically the vent mode, the vent outlet 53 is opened, and the defroster outlet 52 and the heat passage 63 are closed.

  Moreover, the air mix damper 40 rotates until it reaches the maximum cooling position as shown in FIG. Thereby, the cold air side blocking plate 40 b of the air mix damper 40 fully opens the upper opening 60 a of the cold air passage 60 and fully closes the lower opening 60 b, and further, the hot air side closing plate 40 c is the downstream end of the hot air passage 61. The opening 61a is fully closed.

  Accordingly, the entire amount of the cold air generated in the cold air passage 60 flows into the air mix space 62 from the upper opening 60a, blows out from the vent outlet 53, and is supplied to the passenger compartment.

<Maximum heating>
During maximum heating, the blowout mode is basically one of a heat mode, a defroster mode, and a differential / heat mode. FIG. 9 shows the case of the defroster mode.

  Moreover, the air mix damper 40 rotates until it reaches the maximum heating position as shown in FIG. Thus, the cold air side blocking plate 40 b of the air mix damper 40 fully opens the lower opening 60 b of the cold air passage 60 and fully closes the upper opening 60 a, and further, the hot air side closing plate 40 c is the downstream end of the hot air passage 61. The opening 61a is fully opened.

  Accordingly, the entire amount of cold air generated in the cold air passage 60 flows into the hot air passage 61 from the lower opening 60b. And after it becomes warm air in the warm air passage 61, it flows into the air mix space 62, blows out from the defroster outlet 52, and is supplied to the passenger compartment.

<At air mix>
When it is not at the time of the maximum cooling or the maximum heating, cold air and warm air are mixed in the air mix space 62 to obtain conditioned air at a desired temperature.

  That is, as shown in FIG. 1, the air mix damper 40 rotates until it reaches an intermediate position between the maximum cooling position and the maximum heating position. As a result, a part of the cool air generated in the cool air passage 60 flows into the air mix space 62, and the rest flows into the hot air passage 61 to become hot air, and then flows into the air mix space 62. Cold air and hot air flowing into the air mix space 62 are mixed. Depending on the rotational position of the air mix damper 40, the opening degree of the upper opening 60a of the cool air passage 60 and the downstream end opening 61a of the hot air passage 61 are changed, and the amount of cool air and hot air flowing into the air mix space 62 are changed. . That is, by changing the rotation position of the air mix damper 40, conditioned air at a desired temperature can be obtained.

  In particular, as shown in FIG. 10, when the rotation position of the air mix damper 40 is at a position where the opening degree of the cold air passage 60 is made smaller than the opening degree of the hot air passage 61, specifically, the air mix damper 40. Is turned less than 20 ° in the direction of opening the upper opening 60a of the cold air passage 60 from the maximum heating position, the lower surface of the cold air guide portion 40e of the air mix damper 40 and the extending plate portion 69 of the casing 50. 69a, the lower surface 69a extends along the direction in which the cold air guide portion 40e extends, and the space between the cold air guide portion 40e and the lower surface 69a of the extension plate portion 69 is significantly larger than the air mix space 62. Narrow.

  The cold air in the cold air passage 60 passes between the curved plate portion 70 and the front end portion of the cold air side blocking plate 40b of the air mix damper 40 and air mixes the space between the cold air guide portion 40e and the lower surface 69a of the extension plate portion 69. It flows toward the space 62. At this time, the cool air is guided toward the air mix space 62 by the cool air guide 40e. And since the space of the cold wind guide part 40e and the lower surface 69a of the extension board part 69 is narrower than the air mix space 62, the flow velocity of cold wind increases until it reaches the air mix space 62. Furthermore, since the lower surface 69a of the extended plate portion 69 is along the direction in which the cold air guide portion 40e extends, the cold air is rectified by the lower surface 69a of the extended plate portion 69 and the cold air guide portion 40e. The cold air that has been rectified in this manner and has increased the flow velocity flows toward the air mix space 62.

  In the middle of the cold air flowing toward the air mix space 62, there is a step 40 f of the air mix damper 40. When the cold air flows through the portion corresponding to the stepped portion 40f, the flow of the cold air is separated from the air mix damper 40. Thereby, the cold air flows above the stepped portion 40f. Since the cold air side wall portion 40g of the step portion 40f is substantially orthogonal to the cold air guide portion 40e, the separation of the flow of the cold air surely occurs.

  As the cool air flows above the stepped portion 40f, the dynamic pressure of the cool air hardly acts in the vicinity of the downstream end opening 61a of the warm air passage 61, and the amount of warm air flowing into the air mix space 62 from the downstream end opening 61a is reduced. It is suppressed.

  The warm air in the warm air passage 61 flows from the warm air side of the step portion 40f into the step portion 40f, and flows along the warm air side wall portion 40h and the intermediate wall portion 40i of the step portion 40f. Since there is a flow of cold air separated from the air mix damper 40 above the hot air flowing in the stepped portion 40f, a wide contact portion between the cold air and the hot air is ensured. Thereby, mixing with cold air and warm air is accelerated | stimulated, and it mixes favorably.

  Further, a part of the hot air in the hot air passage 61 collides with the cold air side wall 40g of the step portion 40f, makes a U-turn, flows upward, and mixes with the cold air. This also promotes mixing of cold air and hot air.

  Further, a part of the warm air in the warm air passage 61 enters between the side plate portions 76a and 76a of the warm air guide plate 76 of the air mix damper 40 and is guided upward by the connecting plate portion 76b. Thereby, the temperature of the conditioned air in the upper part of the air mix space 62 becomes higher than that on the lower side. Since the defroster air outlet 52 communicates with the upper portion of the air mix space 62, when the air outlet mode is the heat mode and the differential / heat mode, relatively high-temperature conditioned air is supplied to the defroster air outlet 52, and the vent air outlet 53 can be supplied with conditioned air at a desired temperature. Thereby, it is possible to quickly remove fog by supplying a relatively high-temperature conditioned air to the inner surface of the front window without substantially impeding passenger comfort.

  At the time of air mixing, the distal end portion of the cold air side blocking plate 40b of the air mix damper 40 is covered by the curved plate portion 70, so that the cold air is prevented from flowing into the air mix space 62 vigorously. The curved plate portion 70 may be omitted.

  As described above, according to the vehicle air conditioner 1 according to this embodiment, the cold air guide part 40e and the flow of the cold air are separated from the cold air guide part 40e on the cold air side blocking plate 40b of the air mix damper 40. A stepped portion 40f is formed, and an extending plate portion 69 is formed in the casing 50 so as to face the cold air guide portion 40e. Therefore, it is possible to rectify the cold air to increase the flow velocity and guide it to the air mix space 62, and to remove the flow of the cold air from the air mix damper 40 on the way. As a result, the contact portion between the cold air and the hot air can be widened to improve the mixing of the cold air and the hot air in the air mix space 62, and the conditioned air having a desired temperature can be obtained.

  Further, since the cold air guide portion 40e of the air mix damper 40 is formed into a flat plate shape and the extending plate portion 69 of the casing 50 is formed along the direction in which the cold air guide portion 40e extends, it is possible to enhance the rectifying effect of the cold air. . Thereby, the cold wind which flows through the part corresponding to the step part 40f can be reliably peeled from the air mix damper 40.

  Moreover, since the cold wind side wall part 40g of the step part 40f of the air mix damper 40 is extended in the direction substantially orthogonal to the guide direction of the cold wind by the cold wind guide part 40e, it is made to peel cold air from the air mix damper 40 reliably. Thus, the mixing of the cold air and the hot air in the air mix space 62 can be further improved.

  The air mix damper 40 is provided with hot air guide plates 76 and 76 for guiding the hot air to the upper portion of the air mix space 62. Thereby, for example, when the blowing mode is the heat mode and the differential / heat mode, the front window can be quickly fogged with almost no impediment to passenger comfort.

  In the above embodiment, the cold air side wall portion 40g and the cold air guide portion 40e of the step portion 40f of the air mix damper 40 are substantially orthogonal to each other. However, the present invention is not limited to this, and the cold air side wall portion 40g and the cold air guide portion 40e The angle formed may be not less than 80 ° and not more than 100 °.

  Moreover, in the said embodiment, although the warm air guide plates 76 and 76 are provided in the air mix damper 40, not only this but the warm air guide plates 76 and 76 may be abbreviate | omitted.

  Moreover, in the said embodiment, although the case of what is called a semi center type air conditioner with which the air conditioning unit 10 and the ventilation unit 20 were comprised separately was demonstrated, it is not restricted to this, For example, a fan, the evaporator 30, heater core It is also possible to apply the present invention to a so-called full-center type air conditioner configured to arrange 35 at the center in the vehicle width direction.

  As described above, the vehicle air conditioner according to the present invention can be mounted, for example, in a passenger compartment of a passenger car.

DESCRIPTION OF SYMBOLS 1 Vehicle air conditioner 10 Air conditioning unit 20 Blower unit 30 Evaporator (cooling heat exchanger)
35 Heater core (heat exchanger for heating)
40 Air Mix Damper 40a Rotating Shaft 40b Cold Air Side Blocking Plate 40c Hot Air Side Blocking Plate 40e Cold Air Guide 40f Step 40g Cold Air Side Wall 51 Inlet 52 Defroster Outlet 53 Vent Outlet 54 Front Heat Outlet 55 Rear Heat Outlet 62 Air mix space 69 Extension board part 69a Lower surface (opposite surface part)

Claims (4)

A heat exchanger for cooling and a heat exchanger for heating;
While containing the cooling and heating heat exchangers, and including a casing formed with an air conditioning air inlet and air conditioned air outlet,
Inside the casing, the cooling heat exchanger is arranged to cool the air conditioning air, the cooling air passage to cool the air conditioning air, the heating heat exchanger is arranged to heat the air conditioning air, and the cold air passage And an air mix damper connected to the downstream side of the hot air passage and connected to the air outlet, and an air miss damper for adjusting the amount of cold air flowing into the air mix space and the amount of hot air In the arranged vehicle air conditioner,
The air mix damper includes a rotation shaft that is rotatably supported by the casing, a cold air side blocking plate that extends radially from the rotation shaft to open and close the cold air passage, and the rotation shaft. A hot air side blocking plate for extending from the radial direction to open and close the hot air passage,
On the front end side in the extending direction of the cold air side blocking plate, a cold air guide part for guiding the cold air to the air mix space is formed,
On the base end side of the cold air guide portion of the cold air side blocking plate, a step portion for separating the cold air guided by the cold air guide portion from the cold air side blocking plate is formed so as to be recessed toward the cold air passage side,
A vehicular air conditioner characterized in that an opposing surface portion facing the cold air guide portion of the air mix damper is formed in a peripheral edge portion of the downstream end opening of the cold air passage in the casing. In the vehicle air conditioner according to claim 1,
The cold air guide part of the air mix damper is formed in a flat plate shape,
The facing surface portion of the casing has a space between it and the cold air guide portion when the rotation position of the air mix damper is at a position where the opening degree of the cold air passage is smaller than the opening degree of the hot air passage. And the air conditioner for vehicles formed along the direction where this cold wind guide part is extended. The vehicle air conditioner according to claim 1 or 2,
The vehicle air conditioner characterized in that the wall portion of the step portion of the air mix damper is substantially orthogonal to the direction of cold air guided by the cold air guide. In the vehicle air conditioner according to any one of claims 1 to 3,
A vehicle air conditioner, wherein the air mix damper is provided with a hot air guide plate for guiding the hot air to the air mix space.

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