JP2000225824A - Air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent back flow of outside air to the inside of a compartment due to influence of ram pressure at the time of a two-layer mode. SOLUTION: Ram pressure is increased according to an increase in speed and becomes larger than suction pressure of a second fan 7b and outside air is going to flow into a first air duct 3 via a gap of an air blower 7 and a blower case 5. Because a check valve 16 made of a material having flexibility is mounted on a second inside air introduction port 14 the check valve 16 is pressed on an inner wall surface of the blower case 5, the second inside air introduction port 14 becomes a closing state and back flow of outside air can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a first air passage and a second air passage which are divided into a first air passage and a second air passage. TECHNICAL FIELD The present invention relates to a vehicle air conditioner that can switch between two-layer modes in which low-humidity outside air is blown out to improve heating performance and ensure anti-fog properties.

[0002]

2. Description of the Related Art Conventionally, as a blower unit constituting the most upstream portion of the air conditioner for a vehicle, one having a structure as shown in FIG. 9 is known. The blower case 101 of the inside / outside air blower unit 100 is divided into a first air passage 102 and a second air passage 103, and the first and second air passages 102 and 103 are driven by a single motor 104. A fan 105 and a second fan 106 are provided.

A first inside air inlet 107 and an outside air inlet 108 are formed at one end of the blower case 101 in the rotation axis direction of the motor 104, and a second inside air inlet 109 is formed at the other end. I have. The outside air inlet 108 is connected to an outside air intake opening to the vehicle side by a duct (both not shown). The first inside air introduction port 107 and the outside air introduction port 108 are opened and closed by a first inside / outside air switching door 110. On the other hand, the second inside air inlet 109 is opened and closed by the second inside / outside air switching door 111. The blower case 101 includes a first fan 105 and a second fan 106.
A communication passage 112 is formed so as to communicate with each of the suction ports.
Is opened and closed by

In the air conditioner having such an inside / outside air blowing unit 100, when the above-described two-layer mode is set, the first inside / outside air inlet 10 is provided by the first inside / outside air switching door 110.
7, the outside air introduction port 108 is opened, and the communication path 112 is closed by the second inside / outside air switching door 111, and the second inside air introduction port 109 is opened. Each switching door 110, 1
By switching 11 in this manner, outside air is taken into the first air passage 102 from the outside air inlet 108, and inside air is taken into the second air passage 103 from the second inside air inlet 109.

[0005]

By the way, as the traveling speed of the vehicle (hereinafter abbreviated as vehicle speed) increases, the outside air inlet 1
The pressure (ram pressure) of the outside air introduced from 08 increases.
Therefore, when the inside / outside air introduction mode is the two-layer mode,
As shown in FIG. 5, when the ram pressure becomes higher than the suction pressure of the second fan 106 depending on the vehicle speed, as shown by the central arrow A in FIG. Through the gap, the first fan 10
There was a possibility that the gas leaked from the fifth side to the second fan 106 side and flowed backward from the opened second inside air inlet 109 into the vehicle interior.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide a vehicle air conditioner which prevents backflow of outside air into a vehicle cabin due to ram pressure in a two-layer mode.

[0007]

According to a first aspect of the present invention, a blower unit having a first fan and a second fan disposed in a first air passage and a second air passage, respectively, is formed on a second air passage side. A check valve is provided at the second inside air inlet to prevent air from flowing out of the blower case into the vehicle interior. An outside air inlet and a second inside air inlet are opened,
In the two-layer mode in which the outside air is introduced into the first air passage and the inside air is introduced into the second air passage, when the ram pressure becomes larger than the suction pressure of the second fan, the outside air introduced from the outside air introduction port becomes the second air. It flows into the passage.

Since the check valve is provided at the second inside air inlet, the outside air that has flowed into the second air passage due to the increase of the ram pressure flows backward from the inside of the blower case into the vehicle interior through the second inside air inlet. Can be prevented. Thereby, it is possible to prevent a problem that the low-temperature outside air flows into the vehicle interior and the heating efficiency is reduced.

When the second inside / outside air switching door closes the second inside / outside air introduction port, the second inside / outside air switching door sandwiches the check valve and presses against the inner wall surface of the blower case. Since the check valve has a small elasticity, noise may be generated due to wind leakage. Therefore, in the vehicle air conditioner having the structure of the first aspect, a felt material or the like having elasticity is attached to the inner wall surface of the blower case to increase the obstruction, thereby preventing generation of abnormal noise.

[0010] (Regarding claim 2) A packing having elasticity is provided on a surface of the second inside / outside air switching door facing the second inside air introduction port, and the packing is provided when the second inside / outside air switching door is closed. A rib is provided in the vicinity of the opening edge of the contacting second inside air inlet. When the second inside / outside air switching door closes the second inside air introduction port, a packing material (door edge) of the second inside / outside air switching door located outside the check valve is provided around the inner surface of the blower case. By pressing against the inner wall, the seal between the blower case and the second inside / outside air switching door can be surely sealed. Since the second inside air introduction port is closed at the tip of the rib, high obstruction can be obtained.

(Claim 3) A seal member for sealing the check valve and the inner wall surface of the blower case is provided around the opening edge of the second inside air inlet. Therefore, the seal between the blower case and the second inside / outside air switching door can be reliably performed.

According to the fourth aspect of the present invention, by using a flexible member as the check valve, the opening and closing of the second inside air inlet can be switched according to the direction of the air flow generated in the blower case with a simple structure. .

Since the check valve is attached to the pivot of the second inside / outside air switching door, it does not hinder the operation of the second inside / outside air switching door.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A vehicle air conditioner (corresponding to claims 1, 3 and 4) according to a first embodiment of the present invention will be described with reference to FIGS. The vehicle air conditioner of the present embodiment is applied to an air conditioner of a vehicle in which it is difficult to secure a sufficient heat source for heating, such as a vehicle equipped with a diesel engine, an electric vehicle, a hybrid vehicle, and the like. The air-conditioner ventilation system is roughly divided into a blower unit 1 and a temperature adjustment unit 2.

The blower unit 1 constitutes the most upstream portion of the air conditioner for a vehicle, and is disposed between a partition wall for dividing an engine room and a vehicle compartment and an instrument panel (neither is shown). Is done. Further, the blower unit 1 is arranged so as to be offset toward the passenger seat side from the center in the vehicle width direction. A temperature adjustment unit 2 for adjusting the temperature of the conditioned air is connected to the air downstream side of the blower unit 1. The temperature adjustment unit 2 is disposed between the partition wall and the instrument panel as in the case of the blower unit 1.

The blower unit 1 forms an air flow passage into the vehicle interior, and has a blower case 5 in which a first air passage 3 and a second air passage 4 are defined by a partition plate 6. Specifically, the blower case 5 has a scroll case portion 5a in which the flow path has a scroll shape, and the scroll case portion 5a is partitioned by a partition plate 6 in a vertical (up and down) direction. The first and second air passages 3,
4 are formed. Actually, the blower unit 1 is configured such that a plurality of case members are vertically stacked in FIGS.

The scroll case 5a is provided with a blower 7 for generating an airflow blown into the vehicle interior. The blower 7 includes first and second fans 7a and 7b and an electric motor 8 for driving them. The first fan 7a is disposed in the first air passage 3, and the second fan 7b is disposed in the second air passage 4. In the present embodiment, the first,
The second fans 7a and 7b are centrifugal multi-blade fans (sirocco fans), and are integrally formed of resin. As shown in FIGS. 1 and 2, the first and second fans 7a and 7b are arranged so that the direction of the rotation axis is directed up and down.
Is a double-suction type fan that sucks air from both sides in the rotation axis direction (vertical direction in FIGS. 1 and 2). First fan 7a
Sucks air downward from above and blows the air toward the temperature adjustment unit. On the other hand, the second fan 7b sucks air upward from below, and blows this air toward the temperature adjustment unit 2.

The first and second fans 7a and 7b are driven by a single electric motor 8, and the electric motor 8 is inserted upward from below from the suction port of the first fan 7a. Therefore, the suction resistance of the second fan 7b is larger than the suction resistance of the first fan 7a. For this reason, the conditioned air does not easily flow through the second air passage 4, and the amount of the conditioned air is difficult to flow. In the present embodiment, the fan diameter of the second fan 7b is changed to the first fan
The fan diameter is larger than the fan diameter of a. The electric motor 8 is mounted on the outer wall surface of the blower case 5 by a mounting stay 9. An outside air inlet 10 for introducing outside air into the first air passage 3 and a first inside air introduction port 11 for introducing inside air to the first air passage 3 are formed above the blower unit 1. I have. The outside air inlet 10 is
It communicates with the outside air intake opening to the vehicle side via a duct (both not shown), and the first inside air introduction port 11 opens to an upper part in the instrument panel.

The outside air inlet 10 and the first inside air inlet 11 are formed above the first fan 7a, and are selectively opened and closed by a first inside / outside air switching door 12. . The first inside / outside air switching door 12 is driven by a servomotor (not shown). A filter member 13 is provided between the first inside air inlet 11 and the first fan 7a in a detachable state for removing dust.

A second inside air inlet 14 is formed below the blower unit 1 and below the second fan 7b. The second inside air introduction port 14 communicates with the space at the foot of the passenger seat, and serves as an introduction port for introducing inside air into the second air passage 4. The second inside air inlet 14 is
It is opened and closed by the inside / outside air switching door 15. The second inside / outside air switching door 15 is connected to the first inside / outside air switching door 12 by a link mechanism (not shown), and is driven by the above-described servomotor.

The second installed in the blower unit 1
As shown in FIGS. 6A and 6B, the inside / outside air switching door 15 includes a door plate 151 and a packing material 152 attached to a door plate surface facing the second inside air inlet 14. The rotating shaft 153 is mounted on the opening edge of the second inside air introduction port 14. The second inside / outside air switching door 15 is connected to the first inside / outside air switching door 12 by a link mechanism (not shown), and is driven by the above-described servomotor. Note that the packing material 152 of the second inside / outside air switching door 15 is used.
The pressing surface 154 is formed larger than the opening surface of the second inside air inlet 14.

The check valve 16 is provided between the second inside air inlet 14 and the second inside / outside air switching door 15 from a flexible material (for example, tetron fiber coated with silicon rubber). A sheet-shaped flexible member is provided. In the present embodiment, the size of the end face 161 of the check valve 16 is set to the same size as the pressing face 154 of the packing material 152. The check valve 16 is connected to the second inside air introduction port 14 on which the rotation shaft 153 of the second inside / outside air switching door 15 is mounted.
Is fixed at one side to the opening edge portion.

When airflow from the vehicle interior into the blower case 5 is generated, the check valve 1
6 is pressed, and the second inside air inlet 14 is closed. When the second inside / outside air switching door 15 sandwiches the check valve 16 and presses the check valve 16 against the inner wall surface of the blower case 5, the check valve 16 has a small elasticity, so that an abnormal noise may be generated due to a wind leak. Therefore, in this embodiment, the second inside air inlet 1
A stretchable felt material 51 (seal member) is attached to the inner wall surface of the blower case 5 near the opening edge of the opening 4 (except for the rotating shaft 153 side) to increase the obstruction, and to generate abnormal noise due to wind leakage. The occurrence is prevented.

In the blower unit 1, the outside air inlet 10 extends vertically from the outside air inlet 10.
A communication passage 17 is formed to allow the communication with the suction port.
One end of the communication passage 17 communicates with the outside air inlet 10, and the other end communicates with the second air passage 4, and is opened and closed by the second inside / outside air switching door 15. That is, the second inside / outside air switching door 15 selectively opens and closes the second inside air introduction port 14 and the communication passage 17.

In this embodiment, the intake mode is switched by opening and closing the first and second inside / outside air switching doors 12 and 15.

In the whole outside air mode in which outside air is introduced into both the first and second air passages 3 and 4, the outside air introduction port 10 is opened by the first inside / outside air switching door 12, and the first inside air introduction port 11 is closed. At the same time, the second inside air introduction port 14 is closed by the second inside / outside air switching door 15, and the communication passage 17 is opened. Thus, outside air is introduced into the first air passage 3 from the outside air introduction port 10, and outside air is introduced into the second air passage 4 from the outside air introduction port 10 through the communication passage 17.

On the other hand, in the whole inside air mode in which the inside air is introduced into both the first and second air passages 3 and 4, the first inside air introduction port 11 is opened by the first inside / outside air switching door 12, and the outside air introduction port 10 is closed. At the same time, the second inside air introduction port 14 is opened by the second inside / outside air switching door 15, and the communication path 17 is closed. As a result, inside air is introduced into the first air passage 3 from the first inside air inlet 11, and inside air is introduced into the second air passage 4 from the second inside air inlet 14.

In the two-layer mode, the outside air inlet 10 is opened by the first inside / outside air switching door 12, the first inside air introduction port 11 is closed, and the second inside / outside air switching door 1 is closed.
5, the second inside air inlet 14 is opened, and the communication passage 17 is opened.
Is closed. Thereby, the first air passage 3
, Outside air is introduced from an outside air inlet 10, and inside air is introduced into a second air passage 4 from a second inside air inlet 14.

The temperature adjustment unit 2 has an air conditioning case 18 made of a molded article of a resin such as polypropylene. Inside the air conditioning case 18, a blower unit 1 is provided.
An evaporator 19 that cools the air blown from the air, a heater core 20 that is arranged downstream of the evaporator 19, and heats the passing air are stored.

An air passage extending from the downstream end of the scroll case portion 5a, ie, the most upstream end of the air-conditioning case 18 to the evaporator 19 is partitioned by the partition plate 6 into a first air passage 3 and a second air passage 4. First and second flat air mixing doors 21 and 22 are provided between the evaporator 19 and the heater core 20, and the amount of hot air heated by the heater core 20 and the amount of cold air bypassing the heater core 20 are provided. The mixing ratio with the amount is adjusted. In addition, at the time of the maximum heating, the first and second air mix doors 21 and 22 are not shown in FIG.
It is rotated to the position shown by the solid line. At this time, the tip of the second air mix door 22 is located immediately after the evaporator 19,
In addition, the air passage between the evaporator 19 and the heater core 20 is located near the extension of the partition plate 6.
It is a movable partitioning member that is divided into a first air passage 3 and a second air passage 4.

At the downstream end of the air-conditioning case 18, air outlets 23 to 27 (FACE air outlet 23, side F
ACE outlet 24, DEF outlet 25, front FOO
A T outlet 26 and a rear FOOT outlet 27) are formed, and each of the outlets 23 to 27 has an outlet switching door F
An ACE door 28, a DEF door 29, a front FOOT door 30, and a rear FOOT door 31 are provided, and the opening and closing of each of the outlets 23 to 27 is switched according to the blowing mode. Hereinafter, the operation of the present embodiment will be described.

In the vehicle air conditioner having the above configuration, the voltage applied to the electric motor 8 and the doors 12 and 12 are controlled based on signals from various operation means such as temperature setting switches and various sensors (not shown) for controlling air conditioning. 15, 21, 22, 28
Are controlled. That is, according to the set temperature and the air conditioning environment, the blowing mode, the inside / outside air introduction mode,
In addition, the blowing amount of the blower 7 is controlled.

For example, when the heating capacity and the anti-fog property are required to be ensured, that is, when the maximum heating state is set in the foot blowing mode or the foot differential blowing mode, the two-layer mode is adopted as the inside / outside air introduction mode in the blower unit 1. Is selected, and the first and second inside / outside air switching doors 12 and 15 open the outside air inlet 10 and the second inside air inlet 14.

Since the outside air inlet 10 communicates with the outside air intake formed on the vehicle side, the ram pressure increases as the vehicle speed increases. In the state where the two-layer mode is selected as the inside / outside air introduction mode, as shown in FIG.
When the vehicle speed becomes such that the ram pressure becomes larger than the suction pressure of the fan 7b, the outside air flows into the first air passage 3 through the gap between the blower 7 and the blower case 5. At this time, the above-described check valve 16 is pressed against the second inside air introduction port 14 by the outside air flowing into the first air passage 3, and the second inside air introduction port 14 is closed. As a result, the second inside air inlet 14
, It is possible to prevent external air from flowing back into the vehicle interior. As a result, it is possible to prevent the low-temperature outside air from flowing into the vehicle interior, and to prevent a decrease in the heating efficiency.

When the suction pressure of the second fan 7b is sufficiently higher than the ram pressure or when the inside / outside air introduction mode is selected as the inside / outside air introduction mode, the check valve 16 moves to the first air passage 3 side. The second air inlet 14 is opened. Therefore, the inside air is introduced into the blower case 5 without being shut off by the check valve 16.

The check valve 16 is connected to the second inside air inlet 14.
Of the opening edge of the second inside / outside air switching door 15, it is bent so as to turn in the same direction as the turning direction of the second inside / outside air switching door 15. . Therefore, there is no hindrance to the operation of the second inside / outside air switching door 15.

Further, since the check valve 16 is made of a flexible material, no driving means is required for opening and closing the second inside air inlet. Therefore, the check valve 16
Can be simplified.

Next, a vehicle air conditioner (corresponding to claims 2, 3 and 4) according to a second embodiment of the present invention will be described with reference to FIGS.
It will be described based on. The description of the same configuration as in the first embodiment is omitted.

In this embodiment, as shown in FIG. 7, the size of the end face 161 of the check valve 16 is set larger than the opening face of the second inside air inlet 14 and smaller than the pressing face 154 of the packing material 152. ing. Then, as shown in FIG. 8, a rib 52 having a mountain-shaped cross section is provided on the inner wall surface 50 of the blower case 5 at a position where the door edge 150 faces when the second inside / outside air switching door 15 is closed (rotating shaft 153). Except the side).

When the second inside / outside air switching door 15 closes the second inside / outside air introduction port 14, the second inside / outside air switching door 15 is moved to the check valve 16.
And press it against the inner wall surface of the blower case 5 (see FIG. 8A). The second, located outside the check valve 16,
The packing material 152 (door edge 15) of the inside / outside air switching door 15
0) is pressed against the ribs 52 provided on the inner wall surface of the blower case 5 and dented, and the second inside air introduction port 14 is closed {see FIG. 8B}.

In the vehicle air conditioner of this embodiment, the outside air flowing into the second air passage 4 due to the increase of the ram pressure is prevented from flowing backward from the inside of the blower case 5 into the vehicle interior through the second inside air inlet 14. In addition to the effect that the heating efficiency can be prevented from lowering, the following effects can be obtained. When the second inside / outside air switching door 15 closes the second inside air introduction port 14, the packing material 152 of the second inside / outside air switching door 15 is recessed by the rib 52 to close the second inside air introduction port 14. There is no need to attach the felt material 51 to the inner wall surface 50 of the case 5. Further, since the second inside air introduction port 14 is closed at the tip of the rib 52, a high closing property is obtained.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a vehicle air conditioner according to a first embodiment of the present invention.

FIG. 2 is a view showing a structure of a blower unit provided in the vehicle air conditioner according to the first embodiment of the present invention.

FIG. 3 is a perspective view showing a state in which a check valve included in the vehicle air conditioner according to the first embodiment of the present invention is mounted.

FIG. 4 is an explanatory diagram showing a state of a check valve provided in the vehicle air conditioner according to the first embodiment of the present invention, wherein (a) shows a state from inside the blower case to the vehicle interior through a second inside air inlet; FIG. 9B is an explanatory diagram showing a state of the check valve when an airflow heading toward the inside of the blower case is generated. It is explanatory drawing which shows the state of a stop valve.

FIG. 5 is a diagram showing a range of a traveling speed of a vehicle and a range of a voltage applied to a blower, in which a backflow of outside air from a second inside air inlet to a vehicle interior occurs.

FIG. 6 (a) shows a second inside / outside air switching door and a check valve provided in the vehicle air conditioner according to the first embodiment of the present invention, which are attached to a second inside air introduction port around which a felt material is provided. FIG. 7B is a perspective view showing the state, and FIG. 7B is a cross-sectional view when the second inside / outside air switching door closes the second inside air introduction port.

FIG. 7 shows a state in which a second inside / outside air switching door and a check valve provided in a vehicle air conditioner according to a second embodiment of the present invention are attached to an opening edge of a second inside air introduction port provided with ribs. FIG.

FIG. 8A is a side view when a second inside / outside air switching door provided in a vehicle air conditioner according to a second embodiment of the present invention closes a second inside air inlet, and FIG. It is sectional drawing.

FIG. 9 is a view showing a structure of a blower unit in the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Blower unit 3 1st air passage 4 2nd air passage 5 Blower case 7a 1st fan 7b 2nd fan 10 Outside air introduction port 11 1st inside air introduction port 12 1st inside and outside air switching door 14 2nd inside air introduction port 15 2nd Inside / outside air switching door 16 Check valve 52 Rib 150 Door edge 152 Packing material

Claims (5)

[Claims] 1. A blower case in which a first air passage and a second air passage are defined, a first fan disposed in the first air passage, and a second fan disposed in the second air passage. And an outside air introduction port formed on the first air passage side of the blower case to introduce outside air into the blower case; formed on the first air passage side of the blower case;
A first inside air introduction port for introducing inside air into the blower case, a first inside / outside air switching door for switching between opening and closing of the first inside air introduction port and the outside air introduction port, and a second air passage side of the blower case. A second inside air introduction port formed to introduce inside air into the blower case; a second inside / outside air switching door for switching the opening and closing of the second inside air introduction port; and a second inside air introduction port provided at the second inside air introduction port, A vehicle air conditioner, comprising: a blower unit having a check valve for preventing air from flowing out of the blower case into the vehicle interior through an inside air inlet. 2. A packing having elasticity is provided on a surface of the second inside / outside air switching door facing the second inside air introduction port, and when the second inside / outside air switching door is closed, the packing is provided. 2. The air conditioner for a vehicle according to claim 1, wherein a rib is provided in the vicinity of an opening edge of the second inside air inlet to be in contact with the rib. 3. A vehicle according to claim 1, wherein a seal member for sealing the check valve and the inner wall surface of the blower case is provided in the vicinity of an opening edge of the second inside air inlet. Air conditioner. 4. The air conditioner for a vehicle according to claim 1, wherein the check valve is a flexible member, and is attached to an inner wall surface of the blower case. 5. The non-return valve according to claim 1, wherein the check valve is attached to an opening edge of the second inside air introduction port, which is on a rotation axis side of the second inside and outside air switching door. Vehicle air conditioners.