JPH10100636A - Air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display internal air intake function to an internal air sensor always satisfactorily by an aspirator provided at a three-way branch duct even in a vehicular air conditioner that sets a blowoff mode of operating a side face door in a small opening state. SOLUTION: An inlet part 47 of a three-way branch duct 36 is provided with a side face door 52 for adjusting the opening of the inlet part 47. The three-way branch duct 36 is provided with an aspirator air passage 55 by-passing the inlet part 47 and directly opened to the cold-hot air mixing space 35 of a heater unit. Air-conditioning air after control of temperature in the heater unit is led into an aspirator 60 from this aspirator air passage 55. Regardless of the operating position of the door 52, air-conditioning air with specified air pressure thereby flows into the aspirator air passage 55 always stably from the space 35.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aspirator for introducing inside air (vehicle compartment air) around an inside air sensor in a vehicle air conditioner having an inside air sensor for automatically controlling the temperature of blown air.

[0002]

2. Description of the Related Art Conventionally, this type of aspirator in a vehicle air conditioner introduces conditioned air, which is pressure-fed by a blower, into a venturi section to reduce the pressure in the venturi section, thereby providing air inside the venturi section. It sucks inside air around the sensor (for example, see Japanese Utility Model Publication No. 57-14087).

Therefore, when determining the installation location of the aspirator, it is necessary to always select a location where the wind pressure required for the operation of the aspirator can be obtained regardless of the blowing mode. In addition, since wind blows out from the aspirator into the vehicle interior, it is desirable from the viewpoint of air conditioning that the air introduced into the aspirator is air whose temperature has been controlled by the heater unit.

[0004] In view of the above, the aspirator is generally installed at a portion of the heater unit downstream of the heating heat exchanger where the temperature-controlled air flows, and upstream of the blow mode door. Is often selected.

[0005]

However, in a portion of the heater unit downstream of the heating heat exchanger, a mode door operating link mechanism and a servo motor for driving the mode door operating mechanism, or a temperature control air mixing door are operated. In some cases, various devices such as a link mechanism and a servomotor for driving the link mechanism are installed, so that an installation space for the aspirator cannot be secured.

Therefore, the conditioned air from the heater unit is branched into three directions: a center face outlet at the center of the passenger compartment, a side face outlet at the right side of the passenger compartment, and a side face outlet at the left side of the passenger compartment. Attention has been paid to the three-way branch duct, and an installation of an aspirator in this three-way branch duct has also been proposed. .

[0007] That is, in the air conditioner, in the blowing mode other than the face mode (foot mode, defroster mode, etc.), the opening to the center face outlet is closed by the center face door, so that the center face opening is closed. This causes a problem that the amount of air blown out to the side face outlet is excessively increased. In order to solve this problem, a side face door is provided at the entrance of the three-way branch duct, and the opening of this side face door is reduced to a small opening in the blow mode other than the face mode. The device has been implemented.

In this air conditioner, in the blowing mode in which the side face door is operated in the small opening state, the wind pressure in the three-way branch duct is greatly reduced. Cannot be taken out of the device and the aspirator function cannot be exhibited. The present invention has been made in view of the above points, and also in an air conditioner for a vehicle that sets a blowing mode in which a side face door is operated in a small opening state, an inside air sensor is provided by an aspirator air passage provided in a three-way branch duct. It is an object of the present invention to be able to always exhibit the inside air suction function to the air well.

[0009]

In order to achieve the above object, according to the first to fourth aspects of the present invention, air-conditioning air fed by a blower (14) is introduced to the inside air sensor (63).
In an air conditioner for a vehicle having an aspirator (60) for sucking inside air around a vehicle, a center face air outlet (4) is provided.
4) A three-way branch duct (36) for branching conditioned air is provided at the right side face outlet (45) and the left side face outlet (46), and an inlet part (47) of the three-way branch duct (36). Side face door (52) for adjusting the opening of the three-way branch duct (3
6), an aspirator air passage (55) is provided in the outlet side space (35) of the heater unit (30), bypassing the inlet portion (47), and a heater is provided from the aspirator air passage (55). The air-conditioning air after temperature control in the unit (30) is introduced into the aspirator (60).

Thus, the side face door (52)
Regardless of the operation position of the air conditioner, air-conditioning air having a predetermined wind pressure can always flow stably from the outlet side space (35) of the heater unit (30) into the aspirator air passage (55). it can. As a result, in the aspirator (60), inside air suction from the inside air sensor (63) can always be performed stably.

Moreover, according to the present invention, since the aspirator (60) is installed in the three-way branch duct (36), various devices are arranged on the case surface of the heater unit (30), and the aspirator (60) is provided. Even if it is not possible to install the aspirator (60), the aspirator (60) can be installed using the three-way branch duct (36).
The practical advantage that the degree of freedom in selecting the installation location increases is great.

The reference numerals in parentheses of the above means indicate the correspondence with specific means described in the embodiments described later.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. 1 to 7 show an embodiment of the present invention, and FIG. 1 is a schematic diagram showing an entire configuration of an air conditioner ventilation system in the present embodiment.
It is roughly divided into three parts: a blower unit 10, a cooler unit 20, and a heater unit 30. As is well known, these three units 10, 20, and 30 are arranged side by side in the left-right direction of the vehicle from the passenger seat side to the center of the lower part of the instrument panel in the vehicle interior. First, the blower unit 10 will be described. The blower unit 10 has an inside air inlet 11 for introducing inside air (vehicle air),
An outside air inlet 12 for introducing outside air (outside the vehicle compartment) is provided. These inlets 11 and 12 can be opened and closed by an inside / outside air switching door 13.

A blower 14 for blowing air introduced from the inlets 11 and 12 is provided. The blower 14 is a well-known centrifugal multi-blade fan (sirocco fan) 14.
a is rotatably driven by the electric motor 14b. Next, the cooler unit 20 has a resin cooler case 21 connected to the air outlet of the blower 14, and an evaporator (cooling heat exchanger) 22 in the cooler case 21.
Built-in. As is well known, the evaporator 22 cools the conditioned air by absorbing the latent heat of evaporation of the refrigerant in the refrigeration cycle from the conditioned air.

Next, the heater unit 30 will be described. A heater case 31 made of resin is connected to an air outlet of the cooler case 21. A heater core (heating heat exchanger) 32 is provided in the heater case 31. Built-in. The heater core 32 reheats the cold air that has passed through the evaporator 22, and has a high-temperature engine cooling water (hot water) flowing therein, and heats the air using the cooling water as a heat source.

In the heater case 31, a cool air bypass passage 33 is formed on the side of the heater core 32, through which the air (cool air) flows, bypassing the heater core 32. The hot air heated by the heater core 32 and the heater core 32
(By the cool air bypass passage 33)
A flat air mix door 34 that adjusts the ratio of the amount of air flow to the cool air that flows through the air mix door 34 is rotatably disposed.

A cool / hot air mixing space (outlet space) 35 for mixing the hot air passing through the heater core 32 with the cool air from the cool air bypass passage 33 is provided downstream of the heater core 32 in the air.
Is formed, and conditioned air whose temperature is controlled by the air mixing door 34 in the cold / hot air mixing space 35 is obtained. FIGS. 2 and 3 are cross-sectional views illustrating a specific configuration of the cold / hot air mixing space 35 in the heater unit 30. FIGS. 4 and 5 are three-way branch ducts connected to the cold / hot air mixing space 35 of the heater case 31. 36 shows the structure of a single unit.

The heater case 31 is made of a molded article of a resin such as polypropylene having a certain degree of elasticity and excellent strength, and as shown in FIGS.
It is composed of a divided upper case 31a and lower case 31b. The heater case 31 has a structure in which the heater core 32 and a device such as a door, which will be described later, are housed, and then the upper and lower cases 31a and 31b are integrally connected by fastening means such as metal spring clips and screws.

A defroster opening 37 is opened on the upper surface of the heater case 31, and temperature-controlled conditioned air flows into the defroster opening 37 from a cool / hot air mixing space 35. Further, the opening 37 is provided in the defroster outlet 3.
8, and blows air from the outlet 38 toward the inner surface of the vehicle window glass. The defroster opening 37 is opened and closed by a defroster door 39, and the door 39 is
It is installed so as to be rotatable with respect to the heater case 31 by a.

A foot opening 40 is formed in the bottom of the heater case 31, and the temperature-controlled conditioned air flows into the foot opening 40 from the cool / hot air mixing space 35. Further, a foot duct 41 (see FIG. 2) is connected to the foot opening 40, and warm air is blown out to the feet of the occupant from a foot outlet 42 provided at a tip of the foot duct 41.

A foot door 43 is installed in the foot opening 40 so as to be rotatable about a rotating shaft 43a, and the foot opening 40 is opened and closed by the door 43. As shown in FIG. 2, of the heater case 31, the rear side of the vehicle (closer to the occupant)
A three-way branch duct 36 is arranged on the wall surface of and connected. In the three-way branch duct 36, conditioned air whose temperature is controlled flows in from the cold / hot air mixing space 35.
The air is distributed to the center face outlet 44, the right side face outlet 45, and the left side face outlet 46.

As is well known, the center face outlet 44
Is located at the center of the cabin in the instrument panel, the right side face outlet 45 is located on the right side of the cabin in the instrument panel, and the left side face outlet 46 is located on the left side of the cabin in the instrument panel. You. The inlet 47 of the three-way branch duct 36 communicates with the cool / hot air mixing space 35,
The three-way branch duct 36 is integrally connected to the heater case 31.

A center face opening 48 connected to the center face outlet 44 is provided above the front wall surface of the three-way branch duct 36 on the rear side of the vehicle (close to the occupant). A center face door 49 is rotatably mounted on the center face opening 48 by a rotation shaft 49a, and the center face opening 48 is opened and closed by the door 49.

The right side face opening 50 connected to the right side face outlet 45 is provided on the right side face of the three-way branch duct 36, and the left side face of the three-way branch duct 36 is provided on the left side face. A left side face opening 51 connected to the side face outlet 46 is provided. A side face door 52 for adjusting the opening degree of the entrance 47 is provided at an entrance 47 of the three-way branch duct 36.
Is installed so as to be rotatable with respect to the heater case 31 by the rotating shaft 52a. Even when the side face door 52 is operated to the closed position, the internal space 53 of the three-way branch duct 36 is communicated with the cold / hot air mixing space 35 with a small opening degree. Therefore, the notch 54a (FIG. 2, FIG. 2) is formed in the partition wall 54 integrally formed with the lower case 31b of the heater case 31.
3) so that air can easily pass through the cutout portion 54a even at the closed position of the side face door 52.

The left and right side face openings 50,
51 is an internal space 53 of the three-way branch duct 36 shown in FIG.
The space 53 further opens from the entrance portion 47.
, And is always in communication with the cold / hot air mixing space 35. On the other hand, an aspirator air passage 55 is formed on the bottom surface inside the three-way branch duct 36 (in this example, as shown in FIG. 3, at the right corner of the bottom surface) so as to extend in the vehicle front-rear direction. The aspirator air passage 55 is partitioned by a partition wall 56 and is defined with respect to the internal space 53.

Then, one end of the aspirator air passage 55 bypasses the inlet 47 and the heater unit 30
Directly open in the cold / hot air mixing space 35. Therefore,
Air-conditioned air after temperature control in the heater unit 30 is directly introduced into the aspirator air passage 55 from one end thereof. The other end of the aspirator air passage 55 forms a cylindrical portion 58 having a communication hole 57 penetrating through the bottom surface of the three-way branch duct 36 at a position on the vehicle rear side.

The three-way branch duct 36 is made of resin, and the partition wall 56 and the cylindrical portion 58 are
6 are integrally formed. An aspirator 60 is provided below the bottom surface of the three-way branch duct 36. The aspirator 60 has a structure as shown in FIG. 6, and converts the conditioned air supplied by the blower 14 in FIG. The air is introduced into the venturi section 61 through the air passage 55 to reduce the pressure of the venturi section 61, thereby sucking the inside air around the inside air sensor 63.

The aspirator 60 has a main body housing 64 made of resin. A cylindrical portion 64a provided in the main body housing 64 is fitted on the outer peripheral side of the cylindrical portion 58, and
The main body housing 64 is attached and fixed to the bottom surface of the three-way branch duct 36 by hooking an elastic claw piece (not shown). The venturi portion 61 is also made of resin, and is similarly attached and fixed to the main body housing 64 by hooking elastic claw pieces (not shown).

Further, a nozzle 64b opening at the center of the venturi portion 61 is formed integrally with the main body housing 64, and an inside air sensor 63 is connected to the nozzle 64b via a bellows-like connection hose 65. ing. The inside air sensor 63 includes a temperature sensing element 63a such as a thermistor and a housing 63b housing the temperature sensing element 63a, and the housing 63b is always open in the vehicle interior.

In the present embodiment, the inside air sensor 63 is arranged at a position on the vehicle rear side of the three-way branch duct 36, specifically, on the back side of the instrument panel, as shown schematically in FIG. Inside air is introduced into the housing 63b from the provided air hole. The defroster door 39 and the foot door 4
3. The center face door 49 and the side face door 52 are door modes for blowing mode switching, are connected to a link mechanism (not shown), and are operated by an actuator such as a servomotor in response to a blowing mode control signal of the air conditioner. And are operated in conjunction with each other. Here, as shown in FIG. 7, the side face door 52 adjusts the opening of the entrance portion 47 in conjunction with each blowing mode, and maintains the above-mentioned small opening even in the closed position.

Next, the operation of the above configuration will be described.
As is well known, a vehicle air conditioner includes an electronic control unit (not shown) to which operation signals from various operation members provided on an air conditioning operation panel and sensor signals from various sensors for air conditioning control are input. The position of each door 13, 34, 39, 43, 49, 52 is controlled by an output signal of the control device.

First, when the face blowing mode is selected, in FIG. 2, the two face doors 49 and 52 are respectively operated to open positions indicated by the two-dot chain lines, while the defroster door 39 and the foot door 43 are indicated by solid lines. Operated to the closed position. As a result, the conditioned air in the cold / hot air mixing space 35 whose temperature is controlled by the air mixing door 34 is supplied from the three openings 48, 50, 51 of the three-way branch duct 36 to the center and side face outlets 44, 45, 46. Blows out more toward the occupant's head in the cabin.

Next, when the bi-level blowing mode is selected, the center face door 49 and the side face door 52
Is operated to an intermediate opening position rotated by a predetermined amount in the closing direction from the two-dot chain line position in FIG. 2, and the side face door 52 narrows the opening of the entrance 47 by a predetermined amount (see FIG. 7). The defroster door 39 is operated to the closed position, and the foot door 43 is operated to the open position.

The cool air from the cool air bypass passage 33 flows into the upper side of the cool / hot air mixing space 35, and the warm air heated by the heater core 32 flows into the lower side of the cool / hot air mixing space 35. The temperature of the air flowing into the three-way branch duct 36 through the inlet 47 becomes lower than the temperature of the air flowing into the foot opening 40. Therefore, the center and side face outlets 44, 45, 46 and the foot outlet 42
, And the temperature of the blown air blown to the occupant's head is lower than the temperature of the blown air blown to the occupant's feet, so that a comfortable head-foot-foot type temperature distribution is obtained.

Next, when the foot blowing mode is selected,
The center face door 49 is operated to the closed position, and the side face door 52 is operated to the closed position shown by the solid line in FIG. 2 to narrow the opening of the entrance 47 to a small opening state (see FIG. 7). Further, the defroster door 39 is operated to a position where the defroster opening 37 is opened by a small opening, and the foot door 43 is operated to the open position.

Thus, the amount of air blown to the defroster opening 37 is set to about 20%, and the amount of air blown to the foot opening 40 is set to about 80%. A heating action can be performed by blowing warm air to the air. When the center face door 49 is in the small opening state, the side face outlet 45,
A small amount of wind can also be blown out from 46 to prevent fogging of the vehicle side glass.

Next, when the foot defroster blowing mode is selected, the defroster door 39 is operated at an intermediate position where the degree of opening of the defroster opening 37 is increased as compared with the case of the foot blowing mode, and the defroster opening is operated. Both the amount of air blown to 37 and the amount of air blown to foot opening 40 are 50%
Setting to increase the anti-fog effect of the window glass.

Next, when the defroster blowing mode is selected, the defroster door 39 is operated to the fully opened state shown by the two-dot chain line in FIG. 2 with respect to the foot defroster blowing mode.
Further, the foot door 43 is operated to the closed position. Therefore,
Most of the conditioned air from the cool / hot air mixing space 35 blows out from the defroster outlet 38 through the defroster opening 37, and the remaining air blows out from the side face outlets 45 and 46 via the three-way branch duct 36. This maximizes the anti-fog effect of the vehicle window glass.

By the way, one end of the aspirator air passage 55 bypasses the inlet 47 and the heater unit 3
0 is directly opened in the cold / hot air mixing space 35. Therefore, irrespective of the change of each of the blowing modes (in other words, irrespective of the operation position of the side face door 52), the aspirator air passage 55 is always connected to the cold / hot air mixing space 35 of the heater unit 30. Air-conditioned air having a predetermined wind pressure can be stably flowed. As a result, in the aspirator 60, inside air suction from the inside air sensor 63 can always be performed stably.

In the above embodiment, each door 13, 3
The case where the operations of 4, 39, 43, 49 and 52 are performed by an actuator such as a servo motor via a link mechanism has been described. Needless to say, the respective doors may be operated via an operation cable or the like by a manual operation force applied to a manual operation member such as.

In the above embodiment, the aspirator air passage 55 is formed inside the bottom surface of the three-way branch duct 36. However, the aspirator air passage 55 is formed outside the bottom surface of the three-way branch duct 36 and the three-way branch duct. It is also possible to form it on the side surface of 36. In the above-described embodiment, the so-called front-side air-conditioning unit installed below the instrument panel in the front of the vehicle compartment has been described. For example, a vehicle having a large vehicle space in the vehicle front-rear direction such as a wagon vehicle In, a rear-side air conditioning unit is also installed at the rear of the passenger compartment. The rear side air-conditioning unit has a configuration as shown in FIG. , A face ceiling duct 79 and a face outlet 80.

According to experiments conducted by the present inventors, for example,
The shape of the foot duct 77 becomes complicated, and the foot duct 7
It has been found that when the pressure loss of 7 increases, the flow of the wind is disturbed on the downstream side of the outlet mode switching door 76, and low-frequency noise is generated. Therefore, a mesh filter 81 as shown in FIG. 9 is disposed downstream of the blow mode switching door 76 so that the wind once passing through the mesh filter 81 does not flow into the heater unit upstream of the door 76 again. It is. This makes it possible to rectify the flow of the wind and reduce low frequency abnormal noise.

In FIG. 9, a mesh filter 81 is formed by integrally molding a resin frame 81a and a resin net 81b. Then, the mesh filter 81 is inserted into the guide rib 83 provided on the case side of the heater unit, and the mesh filter 8 is inserted.
1 is elastically bent and locked to a hook rib 84 provided on the case side of the heater unit.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a ventilation system of a vehicle air conditioner showing one embodiment of the present invention.

FIG. 2 is a cross-sectional view of a blow-out mode door in the ventilation system of FIG.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a front view of the three-way branch duct shown in FIGS.

FIG. 5 is a right side view of the three-way branch duct shown in FIGS.

FIG. 6 is a sectional view taken along line XX of FIG. 2;

FIG. 7 is an operation characteristic diagram of the side face door.

FIG. 8 is a schematic sectional view of a ventilation system of a rear-side air conditioning unit.

FIG. 9 is a perspective view of a mesh filter used in the air conditioning unit of FIG.

[Explanation of symbols]

14 blower, 30 heater unit, 35 cold / hot air mixing space (outlet space), 36 three-way branch duct, 44
Center face outlet, 45 ... Right side face outlet, 46 ... Left side face outlet, 47 ... Inlet,
49: center face door, 52: side face door, 55: air passage for aspirator, 56: partition wall,
57: communication hole, 63: inside air sensor.

Claims (4)

[Claims] 1. An air conditioner for a vehicle having an aspirator (60) for introducing conditioned air fed by a blower (14) and sucking inside air around an inside air sensor (63), which is disposed in a center portion of a vehicle compartment. Center face outlet (4
4) a right side face outlet (45) disposed on the right side of the passenger compartment, and a left side face outlet (46) disposed on the left side of the passenger compartment; and a heater unit (30) for controlling the temperature of the conditioned air. ), A three-way branch duct (36) having an inlet (47) through which temperature-controlled conditioned air is introduced from an outlet side space (35) of the heater unit (30), and a three-way branch duct (36). A center face opening (48) provided and connected to the center face outlet (44); a right side provided to the three-way branch duct (36) and connected to the right side face outlet (45). The left side face opening (5) connected to the face opening (50) and the left side face outlet (46).
1), a center face door (49) for opening and closing the center face opening (48), a side face door (52) for adjusting the opening of the entrance (47), and the three-way branch duct (36). And the heater unit (30) bypassing the inlet part (47).
And an aspirator air passage (55) that opens directly into the outlet side space (35) of the heater unit (30). ). 2. The aspirator air passage (55).
2. The vehicle air conditioner according to claim 1, wherein the inside of the three-way branch duct (36) is partitioned by a partition wall (56). 3. 3. The aspirator air passage (55).
The air conditioner for a vehicle according to claim 2, wherein the air conditioner is formed on a bottom surface inside the three-way branch duct (36). 4. The aspirator (60) is disposed below the bottom surface of the three-way branch duct (36), and communicates through a communication hole (57) penetrating the bottom surface of the three-way branch duct (36). The air conditioner according to claim 3, wherein the aspirator (60) communicates with the aspirator air passage (55).