JP2019107997A - Drainage structure for vehicular air conditioning apparatus - Google Patents

Abstract

To provide a drainage structure for a vehicular air conditioning apparatus capable of surely preventing an occurrence of abnormal sound due to blowout of air bubbles.SOLUTION: A drainage structure for a vehicular air conditioning apparatus includes: a casing 3 provided with air inlet passage 2 and a drain part 26 that has a drain hole 25 opened in the air inlet passage; a cooling heat exchanger 4 disposed in the air inlet passage; a drain hose 32 which is connected to the drain part and which discharges condensed water produced at the cooling heat exchanger to the exterior of the casing; and a drain passage (27) which is formed in an internal surface of an inner wall of the casing and which guides the condensed water to the drain hole. The drain passage is formed as a first drain passage 27a in communication with the drain hole 25 through a single water passage. Moreover, a second drain passage 27b that guides water different from the condensed water to the drain hole is provided. A first rib 29 and a second rib 30 are provided which merge the flowing direction of the water in the first drain passage 27a with the flowing direction of the water in the second drain passage 27b at the upstream side of the drain hole.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a drainage structure of a vehicle air conditioner for mainly discharging condensed water generated in a cooling heat exchanger.

  A vehicle air conditioner provided for air conditioning of a vehicle compartment accommodates a cooling heat exchanger (evaporator) and a heating heat exchanger (heater core) in a case for introducing outside air outside the vehicle compartment and inside air of the vehicle interior, It has a function of supplying air (cold air or warm air) whose temperature has been adjusted by the cooling heat exchanger and the heating heat exchanger to each part of the vehicle compartment.

  By the way, in such a vehicle air conditioner, when air is cooled to a predetermined temperature (dew point temperature of steam) or less by the cooling heat exchanger, particularly during cooling, the steam contained in the air condenses and the cooling heat exchanger Condensation occurs on the surface of the water, which condenses in the bottom of the case. For this reason, a drainage structure for discharging condensed water generated in the cooling heat exchanger to the outside of the case is provided at the bottom of the case. As this drainage structure, for example, a drain drainage portion having a drainage passage communicating the internal passage inside the case and the outside of the case is cylindrically protruded downward from the bottom wall of the case, and this drainage drainage portion A structure is employed in which condensed water is discharged out of the case through a connected drain hose. In addition, in practice, since rain water, snow and the like with the outside air are taken into the case, it is necessary to discharge water other than the condensed water to the outside of the case with the condensed water. And there is a need to improve the drainage capacity outside the case.

  However, according to the above drainage structure, when there is a large amount of condensed water discharged to the outside of the case, air outside the vehicle (outside air) flows backward from the drainage path of the drain drainage portion toward the inside of the case, and the drain drainage portion The problem is that the amount of drainage per unit time (drainage capacity) of the condensed water in this case is reduced, and the condensed water flowing in the drainage channel of the drain drainage part becomes air bubbles by backflowing external air, generating abnormal noise and the like.

  Then, what is shown in FIG. 8 is proposed by patent document 1 as a drainage structure for solving the said problem.

  That is, FIG. 8 is a longitudinal sectional view of a case bottom showing a drainage structure of a vehicle air conditioner proposed in Patent Document 1, and as shown in the figure, a case for accommodating a cooling heat exchanger (evaporator) 104. A drain drainage portion 126 is provided vertically downward at the bottom of the portion 103. And this drain drainage part 126 penetrates the penetration hole P1 of the vehicle body panel P, and protrudes below the vehicle body panel P, and the spiral part 126a is integrally formed by the rib in the inner peripheral surface. There is.

  The condensed water generated in the cooling heat exchanger 104 drips down along the cooling heat exchanger 104 and accumulates at the bottom in the case 103, and flows into the drain drainage portion 126 from the bottom. Here, as described above, since the spiral portion 126a is formed on the inner peripheral surface of the drain drainage portion 126, the condensed water flowing into the drain drainage portion 126 has a spiral shape along the spiral portion 126a. It flows while turning, and is discharged to the outside of the vehicle through a drain hose (not shown) connected to the drain drainage portion 126. For this reason, even if a large amount of condensed water is accumulated and a large amount of condensed water is accumulated at the bottom of the case 103, the condensed water flows in a spiral while swirling in the drain drainage portion 126, so that the flow velocity is Be enhanced. As a result, a sufficient amount of drainage is secured, and backflow of the outside air from the drain drainage portion 126 is prevented, and the generation of abnormal noise is also suppressed.

JP, 2015-182575, A

  By the way, although it is described in patent document 1 that the said effect is acquired by the drainage structure shown in FIG. 8, according to a research of this inventor, the flow of the water discharged | ejects spiral shape (swirl flow). It was confirmed that when the water flows through the drain hose, air bubbles are generated, and when the air bubbles rupture, abnormal noise is generated. Here, the mechanism by which abnormal noise is generated in the drain hose will be described based on FIG.

  That is, FIG. 9 is a longitudinal cross-sectional view of the case bottom portion of a vehicle air conditioner for explaining the mechanism of generation of abnormal noise in the drainage structure proposed in Patent Document 1, and as shown in FIG. A flexible drain hose 132 is connected to the drain drainage portion 126 provided at the bottom to project, but the drain hose 132 is formed in a straight line in order to be wired in a complex and narrow vehicle space It is rare to do so, and in general, a bend is formed in part.

  Thus, in the drainage structure proposed in Patent Document 1, when the condensed water flows into the drain hose 132 while swirling in the drain drainage portion 126, the condensed water is subjected to an inner circumferential surface of the drain hose 132 by centrifugal force. However, part of the condensed water flowing in the upper part of the drain hose 132 falls by gravity and forms a water film in the internal space of the drain hose 132 as shown in FIG. Here, when the air flows through the inner space of the drain hose 132 at a flow velocity or direction different from the flow of the condensed water, the water film is broken, and a bubble burst sound is generated.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a drainage structure of a vehicle air conditioner capable of reliably preventing the generation of abnormal noise due to the burst of air bubbles.

  In order to achieve the above object, a drainage structure of a vehicle air conditioner according to the present invention includes a case in which an air flow path and a drain drainage portion having a drainage hole opened to the air flow path are formed; Formed on the inner surface of the inner wall of the case, a cooling heat exchanger disposed in the housing, a drain hose connected to the drain drainage portion for discharging condensed water generated in the cooling heat exchanger to the outside of the case, A drainage path for guiding the condensed water to the drainage hole, the drainage path having a first drainage path (27a) communicated with the drainage hole by one water channel.

  A drainage structure of a vehicle air conditioner according to the present invention is a second water formed on the inner surface of the bottom wall of the case, and not composed of condensed water and / or water other than the condensed water which does not flow through the first drainage channel. A second drainage passage different from the first drainage passage leading to the drainage hole, and a second rib projecting from the inner surface of the inner wall of the case to change the flow direction of the second water flowing through the second drainage passage It is preferable that the second water whose flow direction is changed by the second rib merge with the first drainage channel upstream of the drainage hole. Even if it is necessary to drain the second water composed of the condensed water that does not flow through the first drainage channel and water other than the condensed water (for example, rainwater and snow), the second water is upstream of the drainage hole. Since the water reaches the drainage hole after joining the first drainage channel, the condensed water flowing in the first drainage channel and the second water are prevented from swirling around the drainage hole and flow into the inside of the drain hose. .

  A drainage structure of a vehicle air conditioner according to the present invention comprises: a first rib projecting on an inner surface of a bottom wall of the case to change a flow direction of the condensed water flowing through the first drainage passage; It is preferable that the condensed water whose flow direction is changed by the rib and the second water whose flow direction is changed by the second rib merge upstream of the drainage hole. Even if it is necessary to drain the second water, the condensed water flowing through the first drainage channel and the second water respectively join upstream on the upstream side of the drainage hole and then reach the drainage hole. It is reliably prevented that the condensed water and the second water flowing in the water swirl around the exhaust hole, and flow into the inside of the drain hose.

  Further, in order to achieve the above object, a drainage structure of a vehicle air conditioner according to the present invention comprises a case in which an air flow path and a drain drainage portion having a drainage hole opened in the air flow path are formed; A cooling heat exchanger disposed in the flow path, a drain hose connected to the drain drainage portion for discharging condensed water generated in the cooling heat exchanger to the outside of the case, and an inner surface of an inner wall of the case And a drainage path for guiding the condensed water to the drainage hole, wherein the drainage path is a third drainage path formed by a slope falling toward the drainage hole. A plurality of third ribs are radially provided on an inner surface of a bottom wall of the case so as to center on the drainage hole.

  According to the first present disclosure, the condensed water generated in the cooling heat exchanger passes through one drainage channel formed as a single water channel on the inner surface of the bottom wall of the case to the drainage hole of the bottom wall of the case. Since it is guided from one direction, it flows into the drain hose without turning. For this reason, the condensed water flows without swirling on the inner surface of the bottom wall of the case, flows into the drain hose, does not form a water film even at the bent portion, and the noise is caused by the rupture of the water film. The occurrence of is surely prevented.

  According to the second present disclosure, since the drainage path formed on the inner surface of the bottom wall of the case is a slope toward the drainage hole, and a plurality of ribs are radially projected centering on the drainage hole, to the drainage hole The ribs prevent swirling around the drain holes of the inflowing condensate. For this reason, the condensed water flows without swirling on the inner surface of the bottom wall of the case, flows into the drain hose, does not form a water film even at the bent portion, and the noise is caused by the rupture of the water film. The occurrence of is surely prevented.

It is a longitudinal cross-sectional view which shows typically the basic composition of the vehicle air conditioner provided with the drainage structure which concerns on this invention. It is a front view of the case which comprises the drainage structure of the vehicle air conditioner which concerns on Embodiment 1 of this invention. It is a figure of the arrow A direction of FIG. It is a top view of the case which constitutes the drainage structure of the air-conditioner for vehicles concerning Embodiment 1 of the present invention. FIG. 5 is an enlarged detail view of a portion B of FIG. 4; FIG. 5 is an enlarged perspective view of a portion B of FIG. 4; It is a longitudinal cross-sectional view of the case bottom which shows the drainage structure of the vehicle air conditioner which concerns on Embodiment 2 of this invention. It is a longitudinal cross-sectional view of the case bottom part which shows the drainage structure of the vehicle air conditioner proposed in patent document 1. FIG. It is a longitudinal cross-sectional view of the case bottom part for demonstrating the generation | occurrence | production mechanism of the noise in the drainage structure of the vehicle air conditioner proposed in patent document 1. FIG.

  Embodiments of the present invention will be described below based on the attached drawings.

[Air conditioning system for vehicles]
First, a basic configuration of a vehicle air conditioner provided with a drainage structure according to the present invention will be described below based on FIG.

  That is, FIG. 1 is a longitudinal sectional view schematically showing a basic configuration of a vehicle air conditioner, and the vehicle air conditioner 1 shown is housed in a console box (not shown) disposed in front of the driver's seat of the vehicle. In the case 3 in which the air flow path 2 is formed, an evaporator 4 as a heat exchanger for cooling, a heater core 5 as a heat exchanger for heating, and an air mix door It is configured to accommodate 6th grade. In FIG. 1, the left is the front of the vehicle and the right is the rear of the vehicle.

  The evaporator 4 is for cooling the air sent from a blower unit (not shown), and is erected so that all the air flowing through the air flow path 2 in the case 3 passes through. . Although details of the configuration of the evaporator 4 are not illustrated, for example, the evaporator 4 is configured by alternately laminating corrugated fins and tubes in a plurality of stages, and is provided in the refrigerant circuit 7 forming a closed loop. A refrigeration cycle is configured together with the machine 8, the condenser (condenser) 9 and the expansion valve 10.

  The heater core 5 is a hot water type that heats the air cooled by the evaporator 4 with the heat of the engine cooling water, and the air flow direction in the air flow path 2 in the case 3 (right side of FIG. 1) In the lower part of the evaporator 4 (right side in FIG. 1). The details of the configuration of the heater core 5 are not illustrated, but for example, corrugated fins and tubes are alternately stacked in a plurality of stages, and are connected to other devices (not shown) via piping or the like. It constitutes a heat release cycle. The heat core 5 of the present embodiment may be replaced by a refrigerant heating type or an electric heat generation type other than the hot water type.

  The air mix door 6 is vertically slidably disposed between the evaporator 4 and the heater core 5 in the longitudinal direction of the vehicle (left and right direction in FIG. 1), and the air passing through the evaporator 4 is directed to the heater core 5 It functions to adjust the ratio of air to air bypassing the heater core 5. In the present embodiment, a slide door type in which the plate member 6a moves up and down along the guide rails 6c by the rotation of the gear 6b is used as the air mix door 6. The air mix door 6 according to the present embodiment may be replaced by a known door such as a cantilever door, a butterfly door, or a rotary door (not shown).

  On the downstream side of the heater core 5 in the case 3 is formed a warm air flow passage 11 through which the air (warm air) heated by the heater core 5 passes, and on the downstream side of the evaporator 4 A cold air flow passage 12 through which the cold air passes is formed. Then, on the downstream side of the hot air flow passage 11 and the cold air flow passage 12 in the case 3, an air mix chamber 13 in which the hot air and the cold air join is formed.

  In the present embodiment, an air guide 17 is provided in the case 3 from the center in the height direction of the air mix door 6 to the upper portion of the heater core 5, and the hot air flow path 11 and the cold air flow Partitioning the passage 12 prevents unintended mixing of the hot air and the cold air on the upstream side of the air mix chamber 13.

  The case 3 is formed with a defrost outlet 14, a vent outlet 15, and a foot outlet 16 both communicating with the air mix chamber 13 as outlets from which temperature-controlled (temperature-controlled) air is blown.

  The degree of opening of the defroster vent 14 is adjusted by a defrost door 18 disposed in the vicinity thereof, and the air blown out from the defroster vent 14 is blown toward a windshield (not shown) of the vehicle. To perform the anti-fog function of the windshield.

  The degree of opening of the vent blowout opening 15 is adjusted by a vent door 19 disposed in the vicinity thereof, and the air blown out from the vent blowout opening 15 blows out toward the upper body of the occupant through a vent duct (not shown) Be done.

  The degree of opening of the foot outlet 16 is adjusted by a foot door 20 disposed in the vicinity thereof, and the air blown out from the foot outlet 16 directly or through a foot duct (not shown) allows the foot and lower body of the occupant It is blown out toward the In the present embodiment, the foot outlet 16 is open at the lower end of the foot channel 21 communicating with the air mix chamber 13. Here, the foot flow passage 21 is formed by the air guide 22 so as to be located downstream of the hot air flow passage 11.

  Thus, in the vehicle air conditioner 1 configured as described above, the air supplied from the blower unit (not shown) into the case 3 reaches the upstream side of the evaporator 4 and passes through the evaporator 4 The ratio between the air passing through the heater core 5 and the bypassing air is adjusted according to the degree of opening of the air mix door 6, and the air mix chamber 13 formed on the downstream side of the air mix door 6 mixes appropriately. Then, the air is blown into the vehicle compartment from any of the defrost outlet 14, the vent outlet 15, and the foot outlet 16 which are opened in accordance with the outlet mode.

  Here, the operation of the vehicle air conditioner 1 when the full cool mode is selected under the condition that the outside air is hot and humid (for example, summer) will be described.

  In the full cool mode, the air mix door 6 is at the lowermost position shown in FIG. 1, and all the cold air cooled in the evaporator 4 bypasses the heater core 5 and flows from the cold air flow path 12 to the air mix chamber 13 It flows with. At this time, when, for example, the vent mode is selected as the blowout mode, as shown in FIG. 1, the defrost door 18 is closed, the vent door 19 is opened, and the foot door 20 is closed. Here, the operation of the refrigeration cycle including the evaporator 4 will be described.

  That is, a refrigerant such as fluorocarbon circulates while changing the state of the refrigerant circuit 7. First, the high temperature / high pressure gas phase refrigerant compressed by the compressor 8 passes between the condenser 9 and the outside air. Heat exchange, cooled and condensed to become a liquid phase refrigerant. The liquid-phase refrigerant having flowed out of the condenser 9 is adiabatically expanded (iso-enthalpy expansion) by the expansion valve 10 to be reduced in pressure, made into a gas-liquid mixed phase refrigerant, and then led to the evaporator 4. The refrigerant introduced to the evaporator 4 exchanges heat with the air introduced into the case by a blower unit (not shown), absorbs heat from the air flowing through the evaporator 4, and becomes a refrigerant of a gas phase. (To vaporize). That is, the air flowing through the evaporator 4 is cooled.

  As described above, the gas phase refrigerant vaporized by evaporation in the evaporator 4 is led to the compressor 8 and compressed again by the compressor 8 to become a high temperature / high pressure gas phase refrigerant, and thereafter, the same action is performed. Is repeated to cool the air flowing in the case 3 by the evaporator 4.

  Thus, the air (cold air) cooled by the evaporator 4 passes through the cold air flow passage 12 and the mix chamber 13 through the vent outlet 15 through the duct (not shown) as shown by the arrows in FIG. It is blown out toward the upper body and provided for cooling of the passenger compartment.

  By the way, when the air is cooled to a predetermined temperature (dew point temperature of water vapor) or less by the evaporator 4 in the case 3, the water vapor contained in the air is condensed to cause condensation on the surface of the evaporator 4 to become condensed water. Flow down toward the bottom of Case 3. In addition, since rain water, snow, etc. may be taken into the case 3 together with the outside air, water other than condensed water such as rain water or snow melt water also reaches the bottom of the case 3. Furthermore, if the vehicle accelerates or decelerates rapidly with condensed water remaining in the fins of the evaporator 4 or if the vehicle travels on a steep slope, the condensed water only flows down the evaporator 4 There is also a possibility that the condensed water may splash around the evaporator 4. For this reason, it is necessary to provide a drainage structure for discharging the water that reaches the inside of the case 3 through the other route or the condensed water that flows down to the bottom in the case 3 to the outside of the case 3.

[Drainage structure]
Next, an embodiment of the drainage structure provided in the vehicle air conditioner 1 described above will be described.

Embodiment 1
2 is a front view of the case constituting the drainage structure of the vehicle air conditioner according to Embodiment 1 of the present invention, FIG. 3 is a view in the direction of arrow A in FIG. 2, and FIG. 4 is a plan view of the case 5 is an enlarged detail view of a portion B of FIG. 4, and FIG. 6 is an enlarged perspective view of a portion B of FIG.

  The illustrated case (in fact, it is a divided block body which forms a part of the case 2 shown in FIG. 1, but is referred to as a "case" for convenience here) 3 is a rectangular box shape opened at the upper side The resin molded article is disposed such that the longitudinal direction thereof is the vehicle width direction. The interior of the case 3 has an upstream space S1 by a partition wall 3A long in the vehicle width direction (left and right direction in FIG. 4) vertically erected at the vehicle longitudinal direction center (bottom in FIG. 4) of the bottom wall inner surface. And the downstream space S2. Here, "upstream" and "downstream" mean upstream and downstream with respect to the air flow direction.

  The lower part of the evaporator 4 is accommodated in the downstream side space S2 formed in the case 3 as shown in FIG. 3, but one end of the downstream side space S2 in the vehicle width direction (lower end in FIG. 5) The drainage hole 25 having a circular cross-sectional shape is opened toward the upstream side (leftward in FIGS. 3 and 5 and downward in FIG. 4) at the lowest position of. And as shown in FIG. 3, this drainage hole 25 penetrates the inside of the outer peripheral cylindrical drain drainage part 26 which protrudes and extends diagonally downward from the outer surface of case 3 toward the upstream side (left side of FIG. 3). It is formed as. The drain drainage portion 26 penetrates a through hole of a not-shown vehicle body panel (a partition that divides the inside and the outside of the vehicle) and protrudes outward of the vehicle body panel. The flexible hollow drain hose 32 is connected to the case 3 by extrapolating one end to the drain drainage portion 26. Also, the other end (free end) of the drain hose 32 is open to the outside of the vehicle.

  Thus, the downstream space S2 of the case 3 is a space for receiving the condensed water falling from the evaporator 4 and drains the condensed water falling to the base end portion of the downstream side wall surface 3a of the inner surface of the bottom wall thereof. A drainage path 27 (a single linear first drainage path 27a is formed (see FIGS. 3 to 6)) for flowing toward the hole 25. The first drainage path 27a is formed in the drainage hole 25. Slopes 3b and 3c are formed on the inner surface of the bottom wall of the case 3 in the downstream space S2 and are inclined obliquely downward toward the drain side 27 (FIG. 4). ~ 6)).

  By the way, the external air sucked into the case 3 may include rainwater, snow, etc. In such a case, rainwater or snow may adhere to the front surface (the upstream surface) of the evaporator 4, or evaporation may occur. It may reach just before the vessel 4 (near the upstream side of the evaporator 4). In addition, if the vehicle accelerates / decelerates rapidly in a state where condensed water is stagnant between the fins of the evaporator 4 in addition to rain water and snow, or if the vehicle travels on a steep slope, condensed water Not only flows through the evaporator 4, but also the condensed water may splash around the evaporator 4. A space for receiving such rainwater, snowmelt, water scattered from the evaporator 4 and the like (second water) is the upstream space S1 of the case 3. At the base end of the partition wall 3A on the inner surface of the bottom wall of the upstream space S1, one linear drainage passage (second drainage passage) 27b for flowing the second water toward the drainage hole 25 is provided. It is formed. Incidentally, the second drainage channel 27b is inclined obliquely downward toward the drainage hole 25, and the falling rain water or the like is directed to the second drainage channel 27b on the inner surface of the bottom wall of the case 3 in the upstream space S1. A slope 3d for flowing is formed (see FIGS. 4 to 6).

  Thus, in the present embodiment, as shown in FIGS. 4 to 6, the first drainage passage is provided at the end of the first drainage passage 27a (portion near the drainage hole 25) on the inner surface of the bottom wall of the case 3. A first rib 29 projects from the inner surface of the bottom wall of the case 3 so as to change the flow direction of the condensed water at 27a. In the present embodiment, the first rib 29 is shown as a single linear rib.

  Also, as shown in FIG. 4 to FIG. 6, the second water flow in the second drainage passage 27 b at the end of the second drainage passage 27 b (portion near the drainage hole 25) on the bottom wall inner surface of the case 3 A second rib 30 projects from the inner surface of the bottom wall of the case 3 so as to change the direction. In the present embodiment, the second rib 30 is shown as a single rib that bends in a plan view.

  In the drainage structure configured as described above, the condensed water (first water) generated in the evaporator 4 and falling into the downstream space S2 of the case 3 is a slope formed on the inner surface of the bottom wall of the case 3 3b and 3c are collected to the first drainage channel 27a, and the collected condensed water flows along the first drainage channel 27a toward the drainage hole 25.

  Rainwater, snow and the like sucked into the case 3 with the outside air are collected along the slope 3d formed on the inner surface of the bottom wall of the case 3 to the second drainage path 27b. Further, among the water splashed around the evaporator 4, the water splashed upstream of the evaporator 4 is also collected in the second drainage channel 27 b. The collected water (second water) flows toward the drain hole 25 along the second drain 27b.

  The first water flowing through the first drainage channel 27a and the second water flowing through the second drainage channel 27b are also drained toward the drainage hole 25 from different directions as shown by arrows in FIG. Pivoting around the hole 25 is prevented. That is, the direction of the flow of the first water flowing through the first drainage channel 27 a is changed by the first rib 29 provided upstream of the drainage hole 25. Further, the flow direction of the second water flowing through the second drainage passage 27 b is changed by the second rib 30 provided upstream of the drainage hole 25. Then, it flows into the drainage hole 25 from one direction upstream of the drainage hole 25 and is drained to the outside of the case 3 through the drain hose 32. Therefore, the joined first water and second water flow without swirling on the inner surface of the bottom wall of the case 3 and flow into the drain hose 32 without forming a water film even at the bent portion, The generation of abnormal noise due to the rupture of the water film is reliably prevented.

Second Embodiment
Next, a second embodiment of the drainage structure according to the present invention will be described below based on FIG. Here, differences from Embodiment 1 will be mainly described.

  FIG. 7 is a longitudinal sectional view of a case bottom showing a drainage structure of a vehicle air conditioner according to Embodiment 2 of the present invention, and as shown in the figure, the bottom wall of case 3 accommodating evaporator 4 is shown. A drainage hole 25 having a circular cross section is formed. The bottom wall of the case 3 is tapered downward, and the drainage channel 27 (third drainage channel 27 c) guides condensed water to the drainage hole 25 on the inner surface of the narrowed bottom wall. Is formed in the direction perpendicular to the sheet of FIG. 7 (in the vehicle width direction). A plurality of (two in the present embodiment) ribs (third ribs 31) are formed on the inner surface of the bottom surface of the case 3 forming the third drainage channel 27 c on the sloped surface, and around the drainage hole 25. , 31) are projected radially. In addition, in FIG. 7, although the form of linear form is shown, the 3rd rib 31 may be not only this but a curved form.

  At the bottom of the case 3, a drain drainage portion 26 connected to the drainage hole 25 is integrally protruded downward in the vertical direction. The drain drainage portion 26 is formed in the shape of a tapered nozzle whose diameter decreases downward, and penetrates the through hole P1 of the vehicle body panel P and protrudes downward of the vehicle body panel P. The flexible hollow drain hose 32 is connected to the case 3 by extrapolating one end to the drain drainage portion 26. Also, the other end (free end) of the drain hose 32 is open to the outside of the vehicle.

  The condensed water generated in the evaporator 4 drips along the evaporator 4 and flows toward the drainage hole 25 through the drainage passage 27 (third drainage passage 27 c) formed at the bottom in the case 3. However, in the present embodiment, since a plurality of ribs (third ribs 31 and 31) are radially projected around the drainage hole 25 on the sloped inner surface of the bottom wall of the case 3, the water flows into the drainage hole 25. The third rib 31 prevents the swirling around the drainage hole 25 of the condensed water. Then, the condensed water whose turning is prevented by the third rib 31 flows into the drain hose 32 and does not form a water film even at the bent portion, and abnormal noise due to rupture of the water film The occurrence is surely prevented.

1 Vehicle air conditioner 2 Air flow path 3 Case 3A Case partition wall 3a Case downstream wall surface 3b to 3d Case slope 4 Evaporator (heat exchanger for cooling)
5 Heater core (heat exchanger for heating)
6 air mix door 7 refrigerant circuit 8 compressor 9 condenser 10 expansion valve 11 hot air flow path 12 cold air flow path 13 air mix chamber 14 defrost outlet 15 vent outlet 16 foot outlet 17 air guide 18 defrost door 19 vent door 20 foot door 21 foot channel 22 air guide 25 drainage hole 26 drain drainage part 27 drainage channel 27a 1st drainage channel 27b 2nd drainage channel 27c 3rd drainage channel 29 1st rib 30 2nd rib 31 3rd rib 32 drain hose P vehicle body Panel P1 Through-hole S1 in the body panel Upstream space S2 Downstream space

Claims (4)

A case (3) in which an air flow path (2) and a drain drainage portion (26) having a drainage hole (25) opened to the air flow path are formed;
A cooling heat exchanger (4) disposed in the air flow path;
A drain hose (32) connected to the drain drainage portion for discharging condensed water generated in the cooling heat exchanger to the outside of the case;
A drainage passage (27) formed on the inner surface of the inner wall of the case and guiding the condensed water to the drainage hole;
In the drainage structure of a vehicle air conditioner provided with
The drainage structure of a vehicle air conditioner according to claim 1, wherein the drainage passage has a first drainage passage (27a) communicated with the drainage hole (25) by one water passage. The first drainage channel which guides the second water, which is formed on the inner surface of the bottom wall of the case and does not flow through the first drainage channel, and / or water other than the condensed water, to the drainage hole A different second drainage channel (27b),
And a second rib (30) protruding on the inner surface of the inner wall of the case to change the flow direction of the second water flowing through the second drainage path;
The second water according to claim 1, wherein the second water whose flow direction is changed by the second rib joins the first drainage channel (27a) upstream of the drainage hole (25). Drainage structure of vehicle air conditioner. And a first rib (29) protruding from the inner surface of the bottom wall of the case to change the flow direction of the condensed water flowing through the first drainage path;
The condensed water whose flow direction has been changed by the first rib and the second water whose flow direction has been changed by the second rib meet upstream of the drainage hole (25). The drainage structure of the vehicle air conditioner according to claim 2. A case (3) in which an air flow path (2) and a drain drainage portion (26) having a drainage hole (25) opened to the air flow path are formed;
A cooling heat exchanger (4) disposed in the air flow path;
A drain hose (32) connected to the drain drainage portion for discharging condensed water generated in the cooling heat exchanger to the outside of the case;
A drainage passage (27) formed on the inner surface of the inner wall of the case and guiding the condensed water to the drainage hole;
In the drainage structure of a vehicle air conditioner provided with
The drainage channel is a third drainage channel (27c) formed by slopes (3b to 3d) which go down to the drainage hole,
A drainage structure for a vehicle air conditioner, wherein a plurality of third ribs (31, 31) are radially provided on an inner surface of a bottom wall of the case with the drainage hole at the center.

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