JP2000094946A - Air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner unit capable of securing draining performance even while suppressing the short-circuiting of air discharged from a centrifugal blower. SOLUTION: A draining device of a blower unit 2 is provided with a draining pipe 7 integrally formed in the outer wall surface of the blower bottom surface cover 51 of the blower unit 2 and having a draining port 67 inside, a draining pipe 8 integrally formed in the outer wall surface of side wall portion 64 of a cooler case 61 and fitted to the outer periphery of the draining pipe 7, a draining pipe 9 integrally formed in the inner wall surface of the side wall portion 64 of the cooler case 61 and communicated with the draining pipe 8, and a rubber hose 10 fitted to the outer periphery of the draining pipe 9 and having a draining valve 71 provided in its tip part. Thus, during the rotation of a centrifugal blower, the draining valve 71 is closed, and the draining valve 71 is opened when the rotation of the centrifugal blower is stopped, and then water such as rain water or the like entering the blower unit 2 is introduced to a drain port 63 for discharging condensed water from a cooling heat exchanger 5. Thus, water is drained easily out of a car room.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioner capable of improving the drainage of water entering a blower unit having a blower.

[0002]

2. Description of the Related Art In recent years, the temperature of engine cooling water supplied to a heat exchanger for heating such as a heater core has not been sufficiently increased due to a decrease in the calorific value of an engine due to an improvement in fuel-saving performance of the vehicle. There is a problem that a sufficient heating feeling cannot be obtained due to insufficient indoor heating capacity. As a countermeasure, during the heating operation, the already warmed cabin air is guided into the inside air passage, heated by the heating heat exchanger, and then blown out from the foot outlet into the cabin, and the low-humidity air outside the cabin is removed from the outside air. 2. Description of the Related Art A vehicle air conditioner (a so-called car air conditioner) has been proposed which includes an inside / outside air two-layer unit that is guided into a passage and heated by a heating heat exchanger and then blown into a vehicle interior from a defroster outlet.

[0005] As shown in FIG. 5, the inside and outside air two-layer unit as described above includes a blower unit 101 for adjusting the amount of conditioned air blown into the vehicle interior, and a cooling unit such as an evaporator for cooling and dehumidifying the air. The heat exchanger 102 is divided into a cooler unit 103 having a built-in heat exchanger 102 and a heater unit (not shown) having a built-in heat exchanger such as a heater core. The blower unit 101 includes an upper case 111 that forms an inside / outside air switching box, a plurality of inside / outside air switching doors (not shown) for switching an inlet mode, and a centrifugal blower that generates an air flow. , A blower side cover 112 and a blower bottom cover 11 arranged to cover side and bottom portions of the centrifugal blower.
And 3. Note that the upper case 111 is formed with an inside air suction port 114 and an outside air suction port (not shown) communicating with the outside air passage.

[0004] The centrifugal blower includes a centrifugal fan 11.
5. Blower motor 116 and scroll case 117
And so on. The scroll case 117
Is partitioned into an inside air passage and an outside air passage by an intermediate partition plate (not shown). A suction port communicating with the inside air passage is formed on the lower end face of the scroll case 117 in the drawing, and a suction port communicating with the outside air passage is formed on the upper end face of the scroll case 117 in the drawing. On the other hand, the blower side cover 112 is formed with an inside air suction port communicating with the inside air passage.
Here, depending on the environment outside the vehicle compartment such as running on a waterway by an RV vehicle (leisure car) such as a four-wheel drive vehicle, car washing or rainy weather, etc.
Water may enter the blower unit 101 from the outside air inlet.

[0005] As described above, water such as rainwater is supplied to the blower unit 1.
01, and further into the blower motor 116, the rotating body (such as an armature) of the blower motor 116 freezes in a cold region, and rust is generated on metal parts inside the blower motor 116. Occurs, the blower motor 116 does not move, and the centrifugal fan 115
Can not be turned. As a countermeasure, the blower bottom cover 11 located at the most
3, a drain port 119 for draining water such as rainwater that has entered the blower unit 101 onto the bottom wall 104 of the cooler unit 103 is provided. The drain port 119 is connected to the drain port 105 of the cooler unit 103.
Through the bottom wall 104.

[0006]

However, in the conventional blower unit 101 of a two-layer inside / outside air unit, the upstream side of the drain port 119 has a low pressure centrifugal fan 11.
5 is connected to the air upstream side (suction port), and the downstream side is connected to the air downstream side (cooler unit 103) of the high-pressure centrifugal fan 115. For this reason, water such as rainwater flowing into the cooler unit 103 flows backward or foams. To prevent this, the drain port 119
When the port diameter of the drain port 119 is increased, the air discharged from the scroll case 117 into the cooler unit 103 when the centrifugal fan 115 rotates, as shown in FIG. As shown by the arrow in FIG. 5, the air flow returns to the centrifugal fan 115 through the drain port 105 → the drain port 119 (short circuit), thereby reducing the amount of air-conditioning air blown out from the outlet into the vehicle interior. There is a problem of insufficient capacity.

The present inventors have also proposed the following vehicle air-conditioning system (Japanese Patent Application No. 2002-214873) for the purpose of preventing backflow due to a pressure difference between a blower unit and a cooler unit and improving drainage. Hei 9-276070). In this vehicle air conditioner, as shown in FIGS. 6 and 7, a cooler case 121 of a cooler unit is provided.
The opening 12 for attaching the evaporator 122
The cover member 124 for closing the opening 123 is fitted to the cooler case 121. A rail-shaped two rows of ribs 126 are integrally formed inside the male fitting portion 125 of the lid member 124,
An insulator 127, which is a heat insulating member, is mounted between the evaporator 122 and the lid member 124. Then, water such as rainwater that has entered the blower unit is discharged from the drain port 119 → the drain port 105 → the space 128 between the lid member 124 and the insulator 127 → the drain port 129.
The outside of the passenger compartment is drained through a drain passage 130 constituted by:

In the middle of the drain passage 130, that is, in the space 128, a throttle portion 131 having a smaller passage area than the upstream and downstream sides is provided. Specifically, the squeezing portion 131 is constituted by a pair of inclined walls 132 and 133 integrally formed so as to approach each other from the respective rib portions 126 on the inner wall surface of the lid member 124. By providing such a throttle portion 131, the backflow of water in the drain passage 130 can be prevented, so that the accumulation of water in the blower unit can be prevented. However, it is necessary to form a space 128 between the rib portion 126 of the lid member 124 and the insulator 127 in order to provide the above-described throttle portion 131.
There arises a problem that the setting position of the drain ports 105 and 119 is restricted (specifically, it must be set on the side surface of the evaporator 122).

[0009] A method of draining water in the blower unit by attaching a rubber pipe or a joint separate from the blower case to the drain port is also conceivable. However, it is necessary to provide the rubber pipe and the joint, which increases the number of parts. ,
As the number of assembling steps increases, the problem that the product cost of the vehicle air conditioner increases.

[0010]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an air conditioner for a vehicle which can ensure drainage while suppressing a short circuit of air discharged from a blower. It is another object of the present invention to provide a vehicle air conditioner that can freely set a setting position of a drain port.

[0011]

According to the first aspect of the present invention, by adding a drain valve to the drain port provided in the first resin case, the pressure on the upstream side of the drain port becomes higher than that on the downstream side. When the height rises, the drain port is opened, and the water in the first resin case is drained to the drain means in the second resin case. Conversely, when the pressure on the upstream side of the drainage port becomes lower than that on the downstream side, the drainage port is closed, so that the drainage valve can be closed during operation of the blower. As a result, water such as rainwater flowing into the second resin case side of the drain port flows backward,
It does not foam and short circuit of the air discharged from the blower can be prevented. Further, the setting position of the drain port can be set freely.

According to the second aspect of the present invention, the first drain pipe is integrally formed on the outer wall surface of the first resin case so as to protrude from the outer wall surface of the first resin case toward the second resin case,
The second drain pipe is fitted around the outer periphery of the first drain pipe to form a second drain pipe.
The first and second drain pipes are formed separately from the first resin case or the second resin case by being integrally formed on the inner wall surface of the second resin case so as to protrude from the inner wall surface of the resin case toward the drain means side. Since the number of parts can be reduced as compared with the case of providing, the assembling workability can be improved, and the manufacturing cost of the vehicle air conditioner can be reduced.

According to the third and fourth aspects of the present invention, the outlet of the tubular rubber hose fitted to the outer periphery of the second drain pipe is closed, and a slit is provided in the closed portion to thereby provide a drain valve. Is composed. Alternatively, the drain valve is constituted by a rubber valve attached so as to close the outlet of the second drain pipe from the outside. As a result, the number of parts can be reduced as compared with the case where an electromagnetic valve composed of an electromagnetic coil, a spring and a valve element, and a check valve composed of a spring and a valve element are provided. And the manufacturing cost of the vehicle air conditioner can be reduced.

[0014]

1 to 4 show an embodiment of the present invention. FIG. 1 shows an air conditioning unit of a vehicle air conditioner, and FIG. 2 shows an air conditioner. FIG. 3 is a diagram showing a main part of the unit.

The vehicle air conditioner according to the present embodiment includes an air conditioning unit 1 disposed on the front side in the passenger compartment. The air conditioning unit 1 includes a blower unit 2 that adjusts an air volume,
It comprises a cooler unit 3 for cooling and dehumidifying air, a heater unit 4 for heating air, and the like.

First, the structure of the heater unit 4 will be briefly described with reference to FIG. Here, FIG. 3 is a diagram showing a cooler unit and a heater unit.

The heater unit 4 has a heater case 11 connected to the air downstream of the cooler unit 3 having a cooling heat exchanger 5 such as an evaporator. The heater case 11 includes a heating heat exchanger 6 such as a heater core, two air mix (A / M) doors 12 and 13, and four air outlet switching doors 14 to 17.

A defroster (DEF) outlet 20 and a face (FA)
CE) outlet 21, front foot (FrFOOT) outlet 22 and rear foot (RrFOOT) outlet 23
Are opened, and the first and second air passages 25, 2 partitioned by an intermediate partition plate 24 provided in the air conditioning unit 1.
6, two communication passages 27 and 28 are formed.

Here, the outlet mode of this embodiment is F
A face (FACE) mode in which only the ACE outlet 21 is opened, a bilevel (B / L) mode in which the FACE outlet 21 and the Fr and RrFOOT outlets 22 and 23 are opened, and at least only the Fr and RrFOOT outlets 22 and 23 are opened. (DEF) mode in which the DEF outlet 20 and Fr and RrFOOT outlets 22 and 23 are opened, and a defroster (DEF) mode in which only the DEF outlet 20 is opened. .
In the FOOT mode, the DEF outlet 20 may be opened so as to have a smaller opening than in the F / D mode.

The heating heat exchanger 6 passes through the intermediate partition plate 24 and is
Are arranged so as to partially cover the width direction or the height direction of the. The heating heat exchanger 6 is connected to the first air passage 2.
5 includes a first heating unit that heats the air flowing through the inside and a second heating unit that heats the air flowing through the second air passage 26.

The first air passage 25 is used to transfer the inside air mainly drawn from the inside air suction port 31, which will be described later, to Fr, RrF.
This is an inner air layer (inner air passage) that blows out from the OOT outlets 22 and 23 into the vehicle interior (particularly the feet of the vehicle occupant). The second air passage 26 receives outside air mainly drawn from the outside air suction port 34 to be described later, and supplies the air to the DEF outlet 20 or the FACE outlet 2.
1 is an outside air layer (outside air passage) that blows out into the vehicle interior (in particular, the inner surface of the windshield or the head and chest of the vehicle occupant).

Next, the structure of the blower unit 2 will be briefly described with reference to FIGS. 1, 2 and 4. Here, FIG.
FIG. 3 is a view showing a blower unit.

The blower unit 2 is constructed by connecting the inside / outside air switching means and a centrifugal blower. The inside / outside air switching means is for taking at least one or both of the vehicle interior air (hereinafter referred to as inside air) and the vehicle outside air (hereinafter referred to as outside air) into the inside / outside air switching box (upper case) 30. The inside / outside air switching box 30 is integrally formed of a resin material such as polypropylene.

On the most upstream side of the blower unit 2, two inside air suction ports 31 and 32 for sucking inside air and an outside air suction port 34 for sucking outside air are formed. In the blower unit 2, two inside / outside air switching doors 35, 36 and the like are provided by an actuator such as a servomotor and a link mechanism.

Here, the suction port mode of the present embodiment includes an inside / outside air two-layer mode in which the inside air suction port 31 and the outside air suction port 34 are opened and the inside air suction port 32 is closed (see FIG. 4), and the outside air suction port 34. Outside air introduction mode in which only the inside air suction ports 31 and 32 are closed, and the inside air suction ports 31 and 32 are closed.
Are all opened, and only the outside air suction port 34 is closed. An air filter 37 is provided between the inside / outside air switching means and the centrifugal blower for purifying air by capturing foreign substances such as dust and dirt in the air.

The centrifugal blower is disposed substantially at the center in the blower side cover 50 connected to the lower side of the inside / outside air switching box 30 in the drawing. The blower side cover 50 is integrally formed of a resin material such as polypropylene. Then, the centrifugal blower generates first and second centrifugal fans 41 and 42 for generating an airflow toward the vehicle interior,
It comprises a blower motor 43 for rotatingly driving the second centrifugal fans 41 and 42, a spiral blower case 44 for accommodating the first and second centrifugal fans 41 and 42, and the like.

The blower case 44 is integrally formed of a resin material such as polypropylene. Blower case 44
First and second suction ports 45 and 46 are formed on the air suction side at both ends of the first and second swirl-shaped first ports, the insides of which are communicated with the first and second air passages 25 and 26 by an intermediate partition plate 47, respectively. , And second ventilation passages 48 and 49.
The blower bottom cover 51 connected below the blower side cover 50 in the drawing corresponds to the first resin case of the present invention, and is integrally formed of a resin material such as polypropylene.

Also, the bottom wall 53 of the blower bottom cover 51
Are inclined toward the cooler unit 3 side, that is, gradually lower from the left end in the drawing to the right end in the drawing.
The inclination angle of the bottom wall 53 is, for example, 3 ° to 10 ° with respect to the horizontal direction. A circular drain pipe 7 is integrally formed on the outer wall surface of the side wall portion 54 near the bottom wall portion 53 of the blower bottom cover 51 so as to protrude toward the cooler unit 3. This drain pipe 7 corresponds to the first drain pipe of the present invention, and has a drain port 6 for draining water such as rainwater in the blower bottom cover 51 to the cooler unit 3 side.
7 are formed.

Next, the structure of the cooler unit 3 will be briefly described with reference to FIGS. Cooler unit 3
Is a cooler case 6 constituting the second resin case of the present invention.
1, a cooling heat exchanger 5 such as an evaporator, which is a component of a refrigeration cycle mounted on a vehicle, is provided. The refrigeration cycle consists of a compressor, a condenser,
It is composed of a receiver, an expansion valve, the above-described cooling heat exchanger 5, and the like.

The cooling heat exchanger 5 is disposed so as to penetrate the intermediate partition plate 24 and completely cover the ventilation path formed in the cooler case 61, and an insulator (insulation) is provided between the heat exchanger 5 and the cooler case 61. Material) 60 is mounted. The cooling heat exchanger 5 performs an air cooling function of cooling air passing therethrough and an air dehumidifying action of dehumidifying air passing therethrough.

The cooling heat exchanger 5 cools and dehumidifies the air flowing in the first air passage 25 partitioned by the intermediate partition plate 24, and cools the air flowing in the second air passage 26. And a second cooling unit for dehumidifying.

The cooler case 61 is integrally formed of a resin material such as polypropylene. The cooler case 61 has a gutter-shaped bottom wall portion 62 that is inclined substantially V-shaped so as to gradually decrease toward the center below the cooling heat exchanger 5 in the drawing. A drain port 63 communicating with a drain hose (not shown) for discharging condensed water generated in the cooling heat exchanger 5 to the outside of the vehicle is integrally formed at a lowermost portion of the bottom wall portion 62. ing. The drain wall of the present invention is constituted by the bottom wall 62 of the cooler case 61, the drain port 63, and the drain hose.

A drain pipe 8 is integrally formed on the outer wall surface of the side wall portion 64 of the cooler case 61 near the blower unit 2 so as to protrude toward the blower unit 2. The drain pipe 9 is formed integrally with the inner wall surface of the side wall portion 64 so as to protrude above the bottom wall portion 62. These drain pipes 8 and 9 correspond to a second drain pipe of the present invention, and have a drain port 68 for dropping water such as rainwater that has entered the blower unit 2 onto the bottom wall portion 62. , 69 are formed. The inlet end of the drain pipe 8 is fitted to the outer periphery of the drain pipe 7 formed integrally with the blower bottom cover 51 of the blower unit 2.

On the outer periphery of the outlet end of the drain pipe 9, a circular rubber hose (a drain hose with a slit at the end, a drain hose of a tip valve type) having an outlet end located on the bottom wall 62 is provided. 10) are fitted at the inlet end. A drain valve 71 is provided at the outlet end of the rubber hose 10. The drain valve 71 is configured by closing the outlet end of the rubber hose 10 and providing a slit 72 in the closed portion. When the pressure on the drain upstream of the drain ports 67 to 69 becomes higher than the downstream of the drain, drain is performed. Port 67
When the pressure at the drain upstream of the drain ports 67 to 69 is lower than that at the downstream of the drain, the drain ports 67 to 69 are opened.
Close.

[Operation of Embodiment] Next, the operation of the vehicle air conditioner of this embodiment will be briefly described with reference to FIGS.

When an operating voltage is applied to the blower motor 43, the two first and second centrifugal fans 41 and 42 provided integrally rotate to generate conditioned air in the air conditioning unit 1. . In such a case, if the FOOT mode or the F / D mode is selected as the outlet mode, the inlet mode introduces the inside air into the first air passage 25 and the second mode.
The inside / outside air two-layer mode in which outside air is introduced into the air passage 26 is set.

In such a two-layer inside / outside air mode, the already heated high-temperature inside air is reheated by the heating heat exchanger 6 and directed from the Fr and RrFOOT outlets 22 and 23 toward the feet of the vehicle occupant. By blowing out, the heating performance of the vehicle interior can be improved. Furthermore, the anti-fog performance of the windshield can be improved by blowing low-humidity outside air from the DEF outlet 20 toward the inner surface of the windshield.

Here, when the outside air intake port 34 is open during rainy weather or car washing, as in the case of the inside / outside air two-layer mode or the outside air mode, the outside air is sucked into the blower unit 2 from outside the vehicle compartment. , Water such as rainwater infiltrates.
Specifically, a part of the water that has entered the inside / outside air switching box 30 from the outside air suction port 34 reaches the inside of the blower case 44 from the second suction port 46. The water that has penetrated into the blower case 44 and has reached the intermediate partition plate 47 is supplied to the second centrifugal fan 42.
The second centrifugal fan 42 in the second ventilation path 49 of the blower case 44 so as to follow the flow of the conditioned air accompanying the rotation of
Flows in a spiral around the axis of.

The water flowing in a spiral in the second ventilation passage 49 enters the second air passage 26 of the cooler case 61 from the discharge port of the blower case 44, reaches the cooling heat exchanger 5, and cools. Drops along the surface of the heat exchanger 5 for cooling, is collected on the bottom wall surface (surface) of the bottom wall portion 62 of the cooler case 61, passes through the drain hose from the drain port 63, and passes through the drain hose. The condensed water (drain water) of the exchanger 5 is drained out of the passenger compartment.

On the other hand, the inside / outside air switching box 3
The remaining water that has penetrated into the inner wall of the blower drops downward in the drawing through the space between the outer wall surface of the blower case 44 and the blower side cover 50, and the bottom wall surface of the bottom wall portion 53 of the blower bottom cover 51 (inside surface). Reach the top). The water that has reached the bottom wall surface of the bottom wall portion 53 is inclined along the bottom wall surface of the bottom wall portion 53 because the bottom wall portion 53 is inclined so as to gradually decrease toward the cooler unit 3 side. And flows into a drainage port 67 provided on the bottom wall 53 side of the side wall 54.

The water that has flowed into the drain port 67 flows into the rubber hose 10 through the drain ports 68 and 69. Here, when the first and second centrifugal fans 41 and 42 rotate, the drainage upstream side of the drainage ports 67 to 69 (first
The pressure on the upstream side of the suction port 45 (in the vicinity of the air upstream side) is lower than the pressure on the downstream side of the drainage (in the cooler case 61).

As a result, the slit 72 at the closed end of the drain valve 71 provided at the end of the rubber hose 10, that is, at the outlet end, remains closed.
Water accumulates in the drain pipes 7 to 9 and the inside of the rubber hose 10 on the bottom wall surface of the bottom wall portion 53.

When the supply of the operating voltage to the blower motor 43 is stopped and the rotations of the first and second centrifugal fans 41 and 42 are stopped, the drainage ports 67 to 69 are disposed on the upstream side of the drainage port (the first suction port 45). The pressure on the upstream side (in the vicinity of the air) becomes higher than the pressure on the downstream side of the drainage (in the cooler case 61).

As a result, the slit 72 in the closed part of the drain valve 71 is opened by water pressure or the like, and the blower bottom cover 51 is opened.
The water collected inside the drain pipes 7 to 9 and the rubber hose 10 on the bottom wall of the bottom wall 53 drops or falls on the bottom wall of the bottom wall 62 of the cooler case 61. The water dropped or dropped on the bottom wall portion 62 is drained to the drain port 63.
Through the drain hose, and is discharged to the outside of the passenger compartment together with the condensed water in the cooling heat exchanger 5.

[Effects of the Embodiment] As described above, the air conditioning unit 1 of the present embodiment is provided at the closed portion of the drain valve 71 by adding the rubber hose 10 with the drain valve 71 to the drain pipes 7 to 9. When the slit 72 is opened, the water in the blower unit 2 drops or falls on the bottom wall 62 of the cooler case 61, so that the water in the blower unit 2 can be easily drained. Thereby, the outside air inlet 34
Water that has entered the blower unit 2 from the blower motor 4
3 can be prevented from infiltrating into the inside of the blower motor 43, and problems such as the rotator of the rotating body of the blower motor 43 being frozen in a cold region and the occurrence of rust on metal parts inside the blower motor 43 can be avoided.

The first and second centrifugal fans 41, 42
Is rotated, while the pressure on the upstream side of the drainage pipes 7 to 9 is lower than that on the downstream side, the slit 72 of the drainage valve 71 is closed and the communication state between the drainage ports 67 to 69 and the inside of the cooler case 61 is established. Is shut off. As a result, the first and second
With the conditioned air blown out from the centrifugal blower into the cooler case 61 with the rotation of the centrifugal fans 41 and 42,
The water in the drain ports 67 to 69 does not flow backward or foam. Further, air discharged from the centrifugal blower passes through drain ports 67 to 69 and blower unit 2.
Because it can prevent a short circuit that returns inside,
The amount of air-conditioning air blown out from the air outlet into the vehicle compartment does not decrease, and the air-conditioning capacity of the air-conditioning unit 1 does not run short.

By providing a drain valve 71 at the distal end of the rubber hose 10, the cooling heat exchanger 5 and the cooler case 61 are provided in a drain passage until water in the blower unit 2 is guided to the bottom wall 62. It is not necessary to provide a fixed throttle between them. Therefore, since the set positions of the drain ports 67 to 69 can be removed from the side and bottom surfaces of the cooling heat exchanger 5, the set positions of the drain pipes 7 to 9 can be set freely.

The drain valve 71 is integrally provided at the outlet end of the rubber hose 10 fitted on the outer periphery of the drain pipe 9, so that the electromagnetic valve constituted by an electromagnetic coil, a spring, a valve body, etc. The number of parts can be reduced as compared with the case where a check valve including a spring and a valve body is provided. When the drain pipes 7 to 9 are integrally formed with the blower bottom cover 51 and the cooler case 61 made of a resin member, a drain pipe such as a rubber hose or a joint is provided separately from the blower bottom cover 51 and the cooler case 61. The number of parts can be reduced as compared with. Therefore, the workability of assembling the entire air conditioning unit 1 can be improved, so that the manufacturing cost of the air conditioning unit 1 can be reduced.

[Other Embodiments] In the present embodiment, the outlet side end of a circular rubber hose 10 fitted on the outer periphery of the drain pipe 9 is closed, and a slit 72 is provided in the closed portion to provide a rubber hose 10. The drain valve 71 is provided at the tip of the drain pipe 9. The outlet of the drain port 69 can be opened and closed by a rubber valve attached so as to close the outlet end of the drain pipe 9 from the outside. A drain valve may be provided at the outlet end.

In the present embodiment, the drain pipe 8 is fitted around the drain pipe 7 so that the blower unit 2 and the cooler unit 3
The drainage passage extending between the blower unit 2 and the cooler unit 3 is formed by eliminating the drainage pipe 8 and directly fitting the drainage pipe 9 to the outer periphery of the drainage pipe 7. The passages may be connected.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view illustrating an air conditioning unit of a vehicle air conditioner (embodiment).

FIG. 2 is a sectional view taken along line AA of FIG. 1 (embodiment).

FIG. 3 is a sectional view showing a cooler unit and a heater unit (Embodiment).

FIG. 4 is a sectional view showing a blower unit (Embodiment).

FIG. 5 is a partial sectional view showing an air conditioning unit of a vehicle air conditioner (prior art).

FIG. 6 is a sectional view showing a cooler case (prior art).

FIG. 7 is a side view showing a cooler case (prior art).

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 air conditioning unit 2 blower unit 3 cooler unit 4 heater unit 5 cooling heat exchanger 6 heating heat exchanger 7 drain pipe (first drain pipe) 8 drain pipe (second drain pipe) 9 drain pipe (second drain pipe) ) 10 rubber hose 34 outside air suction port 41 first centrifugal fan (blower) 42 second centrifugal fan (blower) 43 blower motor (blower) 50 blower side cover 51 blower bottom cover (first resin case) 61 cooler case (second) (Resin case) 62 bottom wall (drainage means) 63 drain port (drainage means) 67 drainage port 68 drainage port 69 drainage port 71 drainage valve 72 slit

Claims (4)

[Claims] (A) a blower for generating an air flow toward a vehicle interior; (b) a cooling heat exchanger for cooling and dehumidifying the passing air; and (c) a built-in air blower and an exterior of the vehicle. A first resin case having an outside air suction port for sucking air; and (d) connected to the air downstream side of the first resin case and incorporating the cooling heat exchanger, A second resin case having a drain means for draining condensed water; and (e) integrally formed with the first resin case, for draining water in the first resin case into the second resin case. A drain port, and (f) a drain valve that opens the drain port when the pressure on the upstream side of the drain port becomes higher than the downstream side, and closes the drain port when the pressure on the upstream side of the drain port becomes lower than the downstream side. For vehicles with and Adjusting unit. 2. The vehicle air conditioner according to claim 1, wherein the drain port is formed inside a drain pipe, and the drain pipe is formed from an outer wall surface of the first resin case to the second resin. A first drain pipe integrally formed on an outer wall surface of the first resin case so as to protrude toward the case, and fitted to an outer periphery of the first drain pipe; A second drain pipe integrally formed on the inner wall surface of the second resin case so as to protrude to the side, and the drain port is formed inside the first drain pipe. Air conditioner. 3. The air conditioner for a vehicle according to claim 2, wherein the drain valve closes an outlet of a tubular rubber hose fitted on an outer periphery of the second drain pipe, and a slit is provided in the closed portion. An air conditioner for a vehicle characterized by comprising: 4. An air conditioner for a vehicle according to claim 2, wherein said drain valve comprises a rubber valve attached so as to close an outlet of said second drain pipe from outside. apparatus.