JP3799683B2 - Air conditioner for vehicles - Google Patents

Description

[0001]
BACKGROUND 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 a blown air temperature.
[0002]
[Prior art]
Conventionally, this type of aspirator in a vehicle air conditioner introduces conditioned air pumped by a blower into the venturi section and reduces the pressure of the venturi section, thereby allowing the inside air around the inside air sensor to flow into the venturi section. The suction is performed (see, for example, Japanese Utility Model Publication No. 57-14087).
[0003]
Therefore, when determining the installation location of the aspirator, it is necessary to always select a location where the wind pressure necessary for operating the aspirator can be obtained regardless of the blowing mode.
Moreover, since wind blows out from the aspirator into the vehicle interior, it is desirable for air conditioning feeling that the air introduced into the aspirator is the air after the temperature is controlled by the heater unit.
[0004]
From the above viewpoint, the location of the aspirator is generally a part of the heater unit downstream of the heating heat exchanger, where the air after temperature control flows, and upstream of the outlet mode door. Often selected.
[0005]
[Problems to be solved by the invention]
However, in the heater unit, on the downstream side of the heating heat exchanger, the mode door operation link mechanism and its drive servo motor, or the temperature control air mix door operation link mechanism and its drive servo motor, etc. In some cases, the installation space for the aspirator cannot be secured.
[0006]
Therefore, a three-way branch duct that divides the conditioned air from the heater unit into three parts: a center face outlet in the center of the passenger compartment, a side face outlet in the right part of the passenger compartment, and a side face outlet in the left part of the passenger compartment However, when an aspirator is installed in the three-way branch duct, an aspirator function may not be exhibited for the following reason.
[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. There arises a problem that the amount of air blown to the air outlet increases excessively. Therefore, in order to solve this problem, a side face door is provided at the entrance of the three-way branch duct, and the opening degree of the side face door is reduced to a small opening degree in the blowing mode other than the face mode. The device is implemented.
[0008]
In this air conditioner, the wind pressure in the three-way branch duct is greatly reduced in the blow-out mode in which the side face door is operated in a small opening state, so that the wind pressure necessary for the aspirator function is taken out from the three-way branch duct. The situation that the aspirator function cannot be performed occurs.
The present invention has been made in view of the above points, and even in a vehicle air conditioner that sets a blowing mode for operating a side face door to a small opening state, an inside air sensor is provided by an aspirator air passage provided in a three-way branch duct. The purpose is to ensure that the inside air inhalation function can be performed satisfactorily.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claims 1 to 4 has an aspirator (60) for introducing conditioned air pumped by the blower (14) and sucking the ambient air around the ambient air sensor (63). In vehicle air conditioners,
A three-way branch duct (36) for branching conditioned air is provided at the center face outlet (44), the right side face outlet (45), and the left side face outlet (46). A side face door (52) for adjusting the opening of the entrance (47);
An aspirator (60) is provided in the three-way branch duct (36), and the three-way branch duct (36) is directly opened to the outlet side space (35) of the heater unit (30), bypassing the inlet portion (47). An aspirator air passage (55) is provided;
The air-conditioning air after temperature control in the heater unit (30) is introduced into the aspirator (60) from the aspirator air passage (55).
[0010]
As a result, regardless of the operation position of the side face door (52), a predetermined wind pressure is always stably applied to the aspirator air passage (55) from the outlet side space (35) of the heater unit (30). The conditioned air you have can flow in. As a result, in the aspirator (60), the inside air suction from the inside air sensor (63) can always be stably performed.
[0011]
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) cannot be installed. Even in this case, the aspirator (60) can be installed using the three-way branch duct (36), and the practical advantage of increasing the degree of freedom in selecting the location of the aspirator (60) is great.
[0012]
In addition, the code | symbol in the bracket | parenthesis of each said means shows a corresponding relationship with the specific means of embodiment description later mentioned.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1-7 shows one Embodiment of this invention, FIG. 1 is a schematic diagram which shows the whole structure of the air conditioner ventilation system in this embodiment, and an air conditioner ventilation system is divided roughly and it is the air blower unit 10. FIG. The cooler unit 20 and the heater unit 30 are divided into three parts. As is well known, these three units 10, 20, 30 are arranged side by side in the vehicle left-right direction from the passenger seat side to the center portion of the lower part of the instrument panel in the passenger compartment. First, the blower unit 10 will be described. The blower unit 10 is provided with an inside air introduction port 11 for introducing inside air (vehicle compartment air) and an outside air introduction port 12 for introducing outside air (vehicle compartment outside air). Yes. These inlets 11 and 12 can be opened and closed by an inside / outside air switching door 13.
[0014]
And the air blower 14 which ventilates the introduction air from the said inlets 11 and 12 is provided, This air blower 14 becomes a structure which rotationally drives the well-known centrifugal multiblade fan (sirocco fan) 14a with the electric motor 14b. ing.
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 is built in the cooler case 21. As is well known, the evaporator 22 absorbs the latent heat of vaporization of the refrigerant in the refrigeration cycle from the conditioned air to cool the conditioned air.
[0015]
Next, the heater unit 30 will be described. The heater case 31 has a resin heater case 31 connected to the air outlet of the cooler case 21, and a heater core (heating heat exchanger) 32 is built in the heater case 31. ing. The heater core 32 reheats the cold air that has passed through the evaporator 22, and hot engine cooling water (hot water) flows through the heater core 32, and heats the air using the cooling water as a heat source.
[0016]
In the heater case 31, a cold air bypass passage 33 that bypasses the heater core 32 and flows air (cold air) is formed on the side of the heater core 32. A flat air that adjusts the air volume ratio between the hot air heated by the heater core 32 and the cold air that bypasses the heater core 32 (that is, the cold air that flows through the cold air bypass passage 33) is provided at the upstream side of the heater core 32. The mix door 34 is rotatably arranged.
[0017]
On the air downstream side of the heater core 32, a cold / hot air mixing space (exit side space) 35 for mixing the hot air that has passed through the heater core 32 and the cold air from the cold air bypass passage 33 is formed. Air-conditioned air whose temperature is controlled by the mix door 34 is obtained.
2 and 3 are cross-sectional views illustrating a specific configuration of the cool / warm air mixing space 35 in the heater unit 30, and FIGS. 4 and 5 are three-way branch ducts connected to the cool / warm air mixing space 35 of the heater case 31. 36 shows the structure of a single unit.
[0018]
The heater case 31 is made of a resin molded product having a certain degree of elasticity and excellent strength such as polypropylene, and as shown in FIGS. It is comprised from the lower case 31b. The heater case 31 has a configuration in which the upper and lower cases 31a and 31b are integrally coupled with fastening means such as a metal spring clip and a screw after housing the heater core 32 and doors and the like described later.
[0019]
A defroster opening 37 is opened on the upper surface of the heater case 31, and conditioned air whose temperature is controlled flows from the cold / hot air mixing space 35 into the defroster opening 37. Further, the opening 37 is connected to a defroster outlet 38 and blows wind 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 rotatably installed with respect to the heater case 31 by a rotating shaft 39a.
[0020]
In addition, a foot opening 40 is opened at the bottom of the heater case 31, and the temperature-controlled air from the cold / hot air mixing space 35 flows into the foot opening 40. Further, a foot duct 41 (see FIG. 2) is connected to the foot opening 40, and hot air is blown out from the foot outlet 42 provided at the tip of the foot duct 41 to the occupant's feet.
[0021]
In the foot opening 40, a foot door 43 is rotatably installed by a rotating shaft 43a, and the foot opening 40 is opened and closed by the door 43.
As shown in FIG. 2, a three-way branch duct 36 is arranged and connected to the wall of the heater case 31 on the vehicle rear side (occupant side). In the three-way branch duct 36, conditioned air whose temperature is controlled flows from the cold / hot air mixing space 35, and the conditioned air is distributed to the center face outlet 44, the right side face outlet 45, and the left side face outlet 46. To do.
[0022]
As is well known, the center face air outlet 44 is disposed at the center of the vehicle compartment in the instrument panel portion, the right side face air outlet 45 is disposed at the right side of the vehicle compartment in the instrument panel portion, and the left side face air outlet 46 is disposed in the instrument panel. It is arranged on the left side of the passenger compartment in the panel. The three-way branch duct 36 is integrally connected to the heater case 31 so that the inlet 47 of the three-way branch duct 36 communicates with the cold / hot air mixing space 35.
[0023]
A center face opening 48 connected to the center face air outlet 44 is provided above the front wall surface of the three-way branch duct 36 on the vehicle rear side (close to the occupant). In the center face opening 48, a center face door 49 is rotatably installed by a rotation shaft 49a, and the center face opening 48 is opened and closed by the door 49.
[0024]
A right side face opening 50 connected to the right side face outlet 45 is provided on the right side surface of the three-way branch duct 36, and a left side face outlet is provided on the left side surface of the three-way branch duct 36. A left side face opening 51 connected to the outlet 46 is provided.
In addition, a side face door 52 for adjusting the opening degree of the inlet portion 47 is installed at the inlet portion 47 of the three-way branch duct 36. The side face door 52 is rotated with respect to the heater case 31 by a rotating shaft 52a. It is installed movably. 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. Therefore, a notch 54 a (see FIGS. 2 and 3) is formed in the partition wall 54 integrally formed with the lower case 31 b of the heater case 31, and the notch 54 a passes through the notch 54 a even when the side face door 52 is closed. Air is easy to pass through.
[0025]
Also, the left and right side face openings 50 and 51 open into the internal space 53 of the three-way branch duct 36 shown in FIG. Communicating with
On the other hand, an aspirator air passage 55 is formed in the bottom surface inside the three-way branch duct 36 (in this example, as shown in FIG. 3, 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 partitioned from the internal space 53.
[0026]
One end of the aspirator air passage 55 bypasses the inlet 47 and opens directly into the cool / warm air mixing space 35 of the heater unit 30. Therefore, the 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 portion of the aspirator air passage 55 forms a cylindrical portion 58 having a communication hole 57 that penetrates the bottom surface of the three-way branch duct 36 at the rear side of the vehicle.
[0027]
The three-way branch duct 36 is made of resin, and the partition wall 56 and the cylindrical portion 58 are integrally formed with the duct 36.
An aspirator 60 is disposed below the bottom surface of the three-way branch duct 36. The aspirator 60 has a structure as shown in FIG. 6, and the conditioned air fed by the blower 14 of FIG. The inside air around the inside air sensor 63 is sucked by introducing the air into the venturi portion 61 through the air passage 55 and reducing the pressure of the venturi portion 61.
[0028]
The aspirator 60 has a resin-made main body housing 64, and a cylindrical portion 64a provided in the main body housing 64 is fitted to the outer peripheral side of the cylindrical portion 58, and the main body housing 64 is elastic claw pieces (not shown). Is attached and fixed to the bottom surface of the three-way branch duct 36 by hooking. The venturi portion 61 is also made of resin, and is similarly attached and fixed to the main body housing 64 by hooking an elastic claw piece (not shown).
[0029]
Furthermore, a nozzle 64b that opens at the center of the venturi 61 is integrally formed in the main body housing 64, and an inside air sensor 63 is connected to the nozzle 64b via a bellows-like connection hose 65. The inside air sensor 63 includes a temperature sensing element 63a such as a thermistor and a housing 63b accommodating the temperature sensing element 63a. The housing 63b is always open in the vehicle interior.
[0030]
In this example, as shown schematically in FIG. 2, the inside air sensor 63 is disposed at a position on the rear side of the vehicle from the three-way branch duct 36, specifically, on the back surface of the instrument panel, and is opened to the instrument panel. Inside air is introduced into the housing 63b from the hole.
Note that the defroster door 39, the foot door 43, the center face door 49, and the side face door 52 are door units for blowing mode switching, and are connected to a link mechanism (not shown) and are operated by an actuator such as a servo motor to provide an air conditioner. In response to the blowing mode control signal, the interlocking operation is performed. Here, as shown in FIG. 7, the side face door 52 adjusts the opening degree of the inlet portion 47 in conjunction with each blowing mode, and maintains the aforementioned small opening degree even in the closed position.
[0031]
Next, the operation in the above configuration will be described. As is well known, a vehicle air conditioner includes an electronic control device (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 the output signal of this control device.
[0032]
First, when the face blowing mode is selected, in FIG. 2, the two face doors 49 and 52 are each operated to the open position of the two-dot chain line, while the defroster door 39 and the foot door 43 are in the closed position indicated by the solid line. Operated. As a result, the conditioned air in the cool / warm air mixing space 35 controlled in temperature by the air mix door 34 is sent from the three openings 48, 50, 51 of the three-way branch duct 36 to the center and side face outlets 44, 45, 46. Blow out toward the passenger's head in the passenger compartment.
[0033]
Next, when the bi-level blowing mode is selected, the center face door 49 and the side face door 52 are operated to an intermediate opening position rotated by a predetermined amount in the closing direction from the two-dot chain line position in FIG. The face door 52 restricts 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.
[0034]
The cold air from the cold air bypass passage 33 flows into the upper side of the cold / hot air mixing space 35, and the hot air heated by the heater core 32 flows into the lower side of the cold / hot air mixing space 35. The air temperature flowing into the three-way branch duct 36 through 47 becomes lower than the air temperature flowing into the foot opening 40 side. Accordingly, air is blown out simultaneously from both the center and side face air outlets 44, 45 and 46 and the foot air outlet 42, and the air temperature blown out to the passenger's head is blown out to the passenger's feet. The temperature becomes lower than the temperature, and a comfortable temperature distribution of the head cold foot type is obtained.
[0035]
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. Focus on the state (see FIG. 7). 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 an open position.
[0036]
As a result, the amount of air blown to the defroster opening 37 is set to about 20%, the amount of air blown to the foot opening 40 is set to about 80%, and the window glass is prevented from being fogged, while the temperature to the passenger's feet is set. Heating action by wind blowing can be performed. Further, when the center face door 49 is in the small opening state, a small amount of wind can be blown out from the side face air outlets 45 and 46 to prevent fogging of the vehicle side glass.
[0037]
Next, when the foot defroster blowing mode is selected, the defroster door 39 is operated to an intermediate position where the opening degree of the defroster opening 37 is increased as compared with the case of the foot blowing mode, and the defroster opening 37 is opened. Both the blowing air volume and the blowing air volume to the foot opening 40 are set to about 50% to increase the anti-fogging action of the window glass.
[0038]
Next, when the defroster blowing mode is selected, the defroster door 39 is operated to the fully open state indicated by a two-dot chain line in FIG. 2 and the foot door 43 is operated to the closed position with respect to the foot defroster blowing mode.
Therefore, most of the conditioned air from the cold / hot air mixing space 35 is blown out from the defroster outlet 38 through the defroster opening 37 and the remaining air is blown out from the side face outlets 45 and 46 through the three-way branch duct 36. . This maximizes the anti-fogging action of the vehicle window glass.
[0039]
By the way, one end of the aspirator air passage 55 bypasses the inlet 47 and opens directly into the cold / hot air mixing space 35 of the heater unit 30. Accordingly, the aspirator air passage 55 is always connected to the cold / warm air mixing space 35 of the heater unit 30 regardless of the change of each blowing mode (in other words, regardless of the operation position of the side face door 52). Air-conditioned air having a predetermined wind pressure can be stably introduced. As a result, in the aspirator 60, the inside air suction from the inside air sensor 63 can always be stably performed.
[0040]
In the above-described embodiment, the case where each door 13, 34, 39, 43, 49, 52 is operated by an actuator such as a servo motor via a link mechanism has been described. Of course, the doors may be operated via an operation cable or the like by a manual operation force applied to a manual operation member such as an air switching lever, a temperature control lever, or a blow mode lever.
[0041]
In the above embodiment, the aspirator air passage 55 is formed inside the bottom surface of the three-way branch duct 36, but the aspirator air passage 55 is formed outside the bottom surface of the three-way branch duct 36 and the side surface of the three-way branch duct 36. It is also possible to form it.
Moreover, although the said embodiment demonstrated what is called a front side air-conditioning unit installed in the instrument panel lower part of the vehicle interior front part, for example, a vehicle which has large vehicle interior space in the vehicle front-back direction like a wagon car The rear air conditioning unit is also installed at the rear of the passenger compartment. This rear-side air conditioning unit has a configuration as shown in FIG. 8 and includes an inside air introduction port 71, a blower 72, an evaporator 73, a heater core 74, an air mix door 75, a blow mode switching door 76, a foot duct 77, and a foot blow port 78. , A face ceiling duct 79 and a face outlet 80 are provided.
[0042]
According to the experimental study by the present inventors, for example, when the shape of the foot duct 77 is complicated and the pressure loss of the foot duct 77 increases, the flow of wind is disturbed on the downstream side of the blowing mode switching door 76, and the low frequency It was found that an abnormal noise occurred.
Therefore, a mesh filter 81 as shown in FIG. 9 is arranged at the downstream side portion of the blow mode switching door 76 so that the wind once passed through the mesh filter 81 does not flow again into the heater unit upstream of the door 76. It is. As a result, the flow of wind can be rectified to reduce low-frequency noise.
[0043]
In FIG. 9, a mesh filter 81 is formed by integrally molding a resin frame 81a and a resin film 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 81 is elastically bent while being engaged with the hook rib 84 provided on the case side of the heater unit. It is the structure which stops.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view of a vehicle air conditioner ventilation system according to an embodiment of the present invention.
2 is a cross-sectional view of a blowing mode door portion in the ventilation system of FIG.
3 is a cross-sectional view taken along the line AA in FIG.
4 is a front view of a single three-way branch duct shown in FIGS.
FIG. 5 is a right side view of the three-way branch duct shown in FIGS.
6 is a cross-sectional view taken along the line XX of FIG.
FIG. 7 is an operational characteristic diagram of a side face door.
FIG. 8 is a schematic cross-sectional view of the ventilation system of the air conditioning unit on the rear side.
9 is a perspective view of a mesh filter used in the air conditioning unit of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 14 ... Blower, 30 ... Heater unit, 35 ... Cold / warm air mixing space (exit side space), 36 ... Three-way branch duct, 44 ... Center face outlet
45 ... right side face outlet, 46 ... left side face outlet,
47 ... Entrance part, 49 ... Center face door, 52 ... Side face door,
55 ... Air passage for aspirator, 56 ... Partition wall, 57 ... Communication hole,
63: A shy sensor.

Claims (4)

In the vehicle air conditioner having the aspirator (60) for introducing the conditioned air fed by the blower (14) and sucking the ambient air around the interior air sensor (63),
Center face air outlet (44) disposed at the center of the passenger compartment, right side face air outlet (45) disposed at the right side of the passenger compartment, and left side face air outlet (46) disposed at the left side of the passenger compartment. When,
A heater unit (30) for controlling the temperature of the conditioned air;
A three-way branch duct (36) having an inlet portion (47) into which temperature-controlled conditioned air is introduced from the outlet side space (35) of the heater unit (30);
A center face opening (48) provided in the three-way branch duct (36) and connected to the center face outlet (44);
A right side face opening (50) provided in the three-way branch duct (36) and connected to the right side face face outlet (45) and a left side face opening connected to the left side face outlet (46) Part (51);
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 inlet (47) ,
The aspirator (60) is provided in the three-way branch duct (36),
The three-way branch duct (36), said inlet portion (47) bypassing, aspirator air passage which opens directly to the outlet side space (35) of the heater unit (30) (55) is provided,
A vehicle air conditioner for introducing conditioned air after temperature control in the heater unit (30) into the aspirator (60) from the aspirator air passage (55). The vehicle air conditioner according to claim 1, wherein the aspirator air passage (55) is partitioned and formed by a partition wall (56) inside the three-way branch duct (36). . The vehicle air conditioner according to claim 2, wherein the aspirator air passage (55) is formed on a bottom surface inside the three-way branch duct (36). The aspirator (60) is disposed below the bottom surface of the three-way branch duct (36),
The aspirator (60) and the aspirator air passage (55) communicate with each other through a communication hole (57) penetrating the bottom surface of the three-way branch duct (36). Vehicle air conditioner.

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