JP3500231B2 - Vehicle air conditioner - Google Patents

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.
More specifically, the present invention relates to a vehicle air conditioner having a blower in which a peripheral air passage of a scroll casing is provided.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 12, a blower 100 used in an air conditioner for a vehicle has a scroll casing 101 provided with a fan 102 rotatably driven by a motor (not shown). Fan 10
The air sucked in by 2 is sent to the heat exchangers of the evaporator and the heater core, the warm air and the cold air that have passed through the heat exchanger are mixed, the temperature is adjusted to a desired temperature, and the air is distributed to each air outlet of the air conditioning duct. To be winded.

The air blown from the blower is subjected to respective ventilation resistances before passing through the heat exchanger and being distributed to the air outlets of the air conditioning duct. In order to obtain the desired amount of blown air, the ventilation resistance is reduced by improving the fin shape of the heat exchanger and increasing the passage area of each air blow passage, improving the efficiency of the fan, and increasing the size of the fan and scroll. The device is designed to increase the total pressure of the blower.

[0004]

At present, air conditioners for vehicles have a fine temperature / air volume distribution control, such as independent temperature and air volume control in the front, rear, left and right of the vehicle, and improvement of cooling / heating capacity. In addition, with the expansion of the foot space, it is a necessary achievement condition to reduce the size of the blower, heat exchanger, and unit for accommodating each outlet by reducing the size of the instrument panel.

In order to satisfy the above-mentioned conditions, it is inevitable that measures such as the addition of a guide for dividing the air in the ventilation passage and the reduction of the passage area are accompanied by an increase in ventilation resistance.
It is necessary to increase the total blower pressure to compensate for the increase in ventilation resistance. For that purpose, it is necessary to increase the shape of the scroll casing so that the logarithmic spiral shape of the scroll casing is enlarged, that is, to increase the size of the scroll casing. The shape of the scroll casing is determined by the following equation.

(Equation 1) R = (D / 2) eAθ

The above R is the distance from the rotating shaft of the fan to the inner wall of the scroll casing, D is the diameter of the fan, and A is t.
The coefficient represented by an α, θ is the winding angle of the scroll casing. However, it is impossible to effectively enlarge the scroll casing in a limited vehicle space, so the fan blade shape and the motor output were changed to increase the total pressure of the blower. However, the total pressure of the blower could not be improved sufficiently. In particular, with a sucrose casing shaped to increase the wrap angle to increase static pressure and dynamic pressure, the amount of air blown out during cooling (vent mode) is reduced, and the temperature / air flow distribution accompanying this is ideally performed. There was a problem that it did not exist.

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to sufficiently improve the total pressure of the blower without enlarging the scroll casing of the blower of the vehicle air conditioner. .

[0009]

In order to achieve the above object, according to the invention of claim 1, in a vehicle air conditioner equipped with a blower for blowing air sucked by a fan provided in a scroll casing, A sub air passage opening / closing damper is provided on the peripheral wall of the scroll casing and in the air blowing direction to make the scroll casing and the sub air passage communicate or not communicate with each other. It is characterized by being installed on the road.

The invention according to claim 2 is characterized in that the inside / outside air switching device for selectively picking up the inside air or the outside air and the auxiliary air duct opening / closing damper are linked.

The invention according to claim 3 is characterized in that the sub-blower passage opening / closing damper and the air mix damper for adjusting the amount of air passing through the heater core arranged leeward of the blower are interlocked with each other.

[0012] The invention according to claim 4 is characterized in that the sub-air passage opening / closing damper is linked with a mode damper for selecting a vent outlet, a defroster outlet, and a heat outlet.

According to a fifth aspect of the present invention, the end portion of the sub-air passage according to the second aspect is connected to a flow path of air passing through a heater core arranged on the lee side of the blower, and the sub-air passage opening / closing damper is connected. Is also used as an air mix damper for adjusting the amount of air passing through the heater core.

In the invention according to claim 6, the terminal end portion of the auxiliary air passage is connected to any one of a vent outlet, a defroster outlet, and a heat outlet, and the vent outlet, the defroster outlet, and the heat outlet are connected. It is characterized in that a mode damper for selecting an outlet is also used as the above-mentioned auxiliary air duct opening / closing damper.

[0015]

According to the first aspect of the invention, the air sucked by the rotating fan is discharged along the scroll casing, and a part of the air flows into the sub air passage. Since the sub-air passage is provided in the scroll casing in the air blowing direction and extending in the tangential or substantially tangential direction of the scroll casing, substantially the same blower as the scroll casing is upsized. The relationship between pressure and air volume characteristics is obtained. That is, the wind characteristic becomes similar to that when the wrap angle of the scroll casing is reduced, and when compared at the same static pressure, the air volume increases during cooling. Further, since the scroll casing and the sub air passage can be changed to the communication state or the non-communication state by the sub air passage opening / closing damper, the amount of air flowing into the sub air passage can be adjusted. Therefore, the blower total pressure and the air volume characteristic can be appropriately selected and changed.

According to the second aspect of the present invention, when the inside / outside air switching device is switched to suck the inside air, the scroll casing and the auxiliary air passage are in communication with each other, and
In a state where the inside / outside air switching device is switched to suck the outside air, the sub air passage opening / closing damper is interlocked so that the scroll casing and the sub air passage do not communicate with each other.

According to the third aspect of the invention, when the air mix damper is adjusted so that the air does not flow into the heater core, the scroll casing and the auxiliary air passage are in communication with each other, and the air flows into the heater core. Then, the auxiliary air duct opening / closing damper is interlocked so that the scroll casing and the auxiliary air duct do not communicate with each other.

According to the fourth aspect of the present invention, when the mode damper is adjusted to blow air from the vent outlet, the scroll casing and the sub air passage are in communication with each other, and the defroster outlet and the heat blow outlet are provided. In a state where the air is blown out from the outlet, the sub air passage opening / closing damper works so that the scroll casing and the sub air passage do not communicate with each other.

According to the fifth aspect of the invention, the scroll casing and the sub air passage are in communication with each other when the damper is adjusted so that air is not allowed to flow into the heater core. Further, in a state where the auxiliary air duct opening / closing damper is adjusted to allow air to flow into the heater core, the scroll casing and the auxiliary air duct are not in communication with each other.

In the invention according to claim 6, when the damper is adjusted and the air is blown from the vent outlet, the scroll casing and the end portion of the auxiliary air passage are in communication with each other.
Further, in a state where the sub-blast passage opening / closing damper is adjusted and air is blown out from the defroster outlet and the heat outlet, the scroll casing and the end portion are not in communication.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a vehicle air conditioner 3 according to a first embodiment provided with a blower 1 in which a sub air passage, which is a characteristic part of the present invention, is provided. The vehicle air conditioner 3 is configured by disposing an evaporator 4 used for cooling and dehumidifying on the discharge side of the blower 1. The blower 1 is provided so as to suck the air in the inside / outside air switching box 6 and discharge the air to the evaporator. The air that has passed through the evaporator 4 is regulated by the air mix dampers 7 and 8 and sent to the flow path 9 or the heater core 10. The air mix dampers 7 and 8 are used.
Are designed to work together. The air heated by the heater core 10 is adjusted to a predetermined temperature in the air mix chamber 11, and is blown into the vehicle from the vent outlet 14, the defroster outlet 15, and the heat outlet 16 selected by the mode dampers 12 and 13. .

Now, the blower 1 will be described in detail. As shown in FIG. 2, the blower 1 has a centrifugal multi-blade fan 22 attached to a shaft 21 of a motor and rotatably provided inside a scroll casing 20 formed in a logarithmic spiral shape. It is configured. The scroll casing 20 is made of resin and can be divided with a dividing line provided on the peripheral wall portion as a boundary.

The auxiliary air passage 23 is formed of resin integrally with the scroll casing 20 on the outer peripheral wall of the scroll casing 20. More specifically, the auxiliary air passage 23 is a passage at the end position b, which is centered around the shaft 21 of the motor and starts at the nose portion a of the closest position between the scroll casing 20 and the fan 22 and is rotated 300 degrees in the air discharge direction. It is formed so as to extend in the air discharge direction 24 and in the tangential or substantially tangential direction of the scroll casing 20. The auxiliary air passage 23 may be formed at any position as long as it is a peripheral wall of the scroll casing 20, but as described above, it should be provided at a position that does not exceed 300 degrees from the nose portion a around the shaft 21 of the motor. Is preferred. The nose portion a is formed in an R shape to prevent generation of abnormal sound due to passage of wind.

Further, a division line connected to the above-mentioned division line is formed in the sub air passage 23, and the division line is used as a boundary. The cross section of the sub air passage 23 orthogonal to the air discharge direction has a substantially constant cross section from the connection portion 25 with the scroll casing 20 to the outlet portion, and the cross section orthogonal to the air discharge direction of the scroll casing 20. It is smaller than the above.
Further, the end portion 26 of the sub air passage 23 is connected to the end portion 27 of the scroll casing 20, and the air passing through the sub air passage 23 joins with the air discharged from the end portion 27 of the scroll casing 20. It is like this.

In the blower 1 having the above structure, the motor is driven and the centrifugal multi-blade fan 22 is rotated to suck air into the scroll casing 20, and the air is passed through the flow path 24.
When the air is blown along, a part of the blown air is sent to the sub air passage 23. The air that has passed through the auxiliary air passage 23 merges with the air discharged from the terminal end portion 27 of the scroll casing 20 and is sent to the evaporator 4 shown in FIG. 1.

Here, the blowing capacity of the blower 1 will be described. The blowing capacity can be evaluated by the total pressure of the blower. As shown in FIG. 3, the solid line α indicates the relationship between the blower total pressure and the air volume of the blower 1 provided with the auxiliary blower path 23, and the broken line β indicates the blower of the blower without the auxiliary blower path 23. The relationship between total pressure and air volume is shown. Further, FIG. 3 shows a resistance curve a showing the resistance of the air flowing through the vent outlet 14 through which air is blown out during cooling (vent mode),
Defroster outlet 15 or heat outlet 16 during heating
(Heat mode) resistance curve b indicating the resistance of air flowing through
Is drawn.

The air volume obtained from the vent outlet 14 by using the blower 1 in the vent mode and the total blower pressure at that time can be obtained from the intersection point g between the solid line α and the resistance curve a. Similarly, the air volume and the total blower pressure of the blower that does not have the auxiliary blow passage 23 in the vent mode can be obtained from the intersection point c between the broken line β and the resistance curve a. Comparing the air volumes at the intersections c and g and the blower total pressure, it can be seen that the air volume obtained from the intersection c is e with respect to the air volume j obtained from the intersection g, and the air volume at the intersection g is large by ΔQ1. In other words, with the same air volume, △
It can be said that the total blower pressure is improved by P1. As described above, in the blower 1, the blower total pressure can be improved in the vent mode without increasing the size of the scroll casing 20. That is, if the winding angle θ is large, the wind discharged from the fan 22 becomes higher in both static pressure and dynamic pressure in the scroll casing 20, but if the winding angle θ is smaller, the air immediately comes out of the scroll casing 20. This is based on the characteristic that the static pressure and dynamic pressure are low, but the air volume increases, and the same effect as that of reducing the winding angle θ by providing the auxiliary air passage 23 is obtained. It should be noted that the same result can be obtained when the air volume is changed by changing the rotation speed of the fan 22.

Further, the blower 2 can be used instead of the blower 1 in the vehicle air conditioner 3 (second embodiment). As shown in FIG. 4, the blower 2 has the configuration of the blower 1 with the addition of a sub-blower passage opening / closing damper 30. The auxiliary air duct opening / closing damper 30 is configured by attaching a support shaft 31 to one end of a plate material such as a resin plate or a metal plate, and the support shaft 31 is rotated by a hinge 32 attached to an inner wall of the scroll casing 20. It is attached freely. Further, a rotational force transmission member 34 is attached to an end portion of the lever 33 attached to the support shaft 31, and when the rotational force transmission member 34 is moved in the direction of the arrow, the auxiliary air duct is passed through the lever 33. The force is transmitted to the opening / closing damper 30, and the auxiliary air duct opening / closing damper 30 opens / closes the connecting portion 25 so that the scroll casing 20 and the auxiliary air duct 23 are in a communication state or a non-communication state. Regarding the blower 2, the same parts as those of the blower 1 are designated by the same reference numerals, and the description of the configuration will be omitted.

In the ventilator 2 having the above-described structure, in the vent mode, the auxiliary air duct opening / closing damper 30 is moved to open the connecting portion 25 so that the scroll casing 20 and the auxiliary air duct 23 communicate with each other. Thereby, as described above, in the vent mode, the blower total pressure can be improved. In the heat mode or the defroster mode, the auxiliary air passage opening / closing damper 30 is used to connect the connecting portion 25.
Is closed so that the scroll casing 20 and the sub air passage 23 are not in communication with each other, and the air discharged from the blower 2 is introduced into the heater core 10 by the air mix dampers 7 and 8 to heat the air.

Here, the blowing capacity of the blower 2 will be described. As shown in FIG. 3, the broken line β indicates the auxiliary air duct 23.
Although the air volume and the total blower pressure of the blower without the fan are shown, in other words, it can be said that the connection portion 25 of the blower 2 is closed and the scroll casing 20 and the auxiliary blower path 23 are not in communication. Therefore, the scroll casing 2 in the heat mode or the defroster mode
The air volume and total blower pressure of the blower 2 in which 0 and the auxiliary blower path 23 are not in communication can be obtained from the intersection point d between the broken line β and the resistance curve b. Further, the air volume of the blower 1 and the blower total pressure in the heat mode or the defroster mode are indicated by the broken line β.
Can be obtained from the intersection h of the resistance curve b. As can be seen from the fact that the solid line α and the broken line β intersect at the point x, as compared with the air flow rate f obtained from the intersection point d in the blower 2 in which the scroll casing 20 and the auxiliary air passage 23 are not in communication with each other. It can be seen that the air volume k obtained from the intersection h in the blower 1 is small. That is, in the heat mode or the defroster mode, the blower 2 in which the scroll casing 20 and the sub air passage 23 are not in communication with each other
However, compared with the blower 1, the blower total pressure can be improved by ΔP2 at the same air flow rate.

As described above, the blower 2 opens and closes the sub air passage opening / closing damper 30 to open or close the scroll casing 20 and the sub air passage 23 so that the maximum blower total pressure can always be obtained. it can.

Next, the vehicle air conditioner 35 according to the third embodiment will be described. The vehicle air conditioner 35
Is a configuration in which the inside / outside air switching damper 37 provided in the inside / outside air switching box 6 of the vehicle air conditioner 3 using the blower 2 and the sub air passage opening / closing damper 30 of the blower 2 can be interlocked. Specifically, as shown in FIG. 5, the rotational force transmitting member 3 that opens and closes the auxiliary air duct opening / closing damper 30.
4 is connected to a lever 38 that opens and closes a damper 37 of the inside / outside air switching device 36.
6 is provided so that the scroll casing 20 and the sub air passage 23 communicate with each other when the vehicle interior air is sucked in, and the scroll casing 20 and the sub air passage 23 do not communicate with each other when the outside air is sucked in. There is.

In the vehicle air conditioner 35 having the above structure, the vehicle interior air is used for cooling. As is clear from the graph shown in FIG. 3, the scroll casing 20
In the state in which the blower 2 communicates with the sub blower path 23, the relationship between the blower total pressure and the air volume has a relationship suitable for cooling (vent mode), so that the blower total pressure of the blower 2 can be improved.
Similarly, in the heat mode, if the scroll casing 20 and the auxiliary air duct 23 are not in communication with each other, the relationship between the blower total pressure and the air volume is suitable for heating. Therefore, the total blower pressure of the blower 2 can be sufficiently improved. In this way, the vehicle air conditioner 35 can always obtain the maximum blower total pressure according to the selected state of the inside / outside air of the inside / outside air switching device 36.

Vehicle Air Conditioning System According to Fourth Embodiment
As shown in FIG. 6, reference numeral 5 denotes an upstream side unit 5a including an inside / outside air switching box 6 and an evaporator 4, a blower 2, an air mix damper 7, 8, a heater core 10, and a downstream side including mode dampers 12, 13. It is composed of a unit 5b. The blower 2 is, as described above,
The damper 30 is provided. Further, in the vehicle air conditioner 5, the same components as those of the vehicle air conditioner 3 are designated by the same reference numerals and the description thereof will be omitted.

In the above vehicle air conditioner 5, the auxiliary air duct opening / closing damper 30 of the air blower 2 is moved to open the connecting portion 25, the scroll casing 20 and the auxiliary air duct 23 are made to communicate with each other, the motor is driven, and the centrifugal type is used. When the multi-blade fan 22 is rotated and air is sucked into the scroll casing 20, this air is blown along the flow path 24, and a part of the air is sent to the auxiliary air blow path 23. The air that has passed through the sub air passage 23 merges with the air that has been discharged from the terminal end portion 27 of the scroll casing 20, is regulated by the air mix dampers 7 and 8, and does not pass through the heater core 10 and is blown into the vehicle from the vent discharge port 14. Is performed (vent mode).

When the auxiliary air duct opening / closing damper 30 is moved to close the connecting portion 25 so that the scroll casing 20 and the auxiliary air duct 23 are not in communication with each other, all the air blown along the flow passage 24 is completely scrolled. It is discharged from the terminal end 27 of 20. The discharged air is regulated by the air mix dampers 7 and 8, passes through the heater core 10 and is heated, and is blown into the vehicle from the heat outlet 15 or the defroster outlet 16 (heat mode).

As described above, in the vehicle air conditioner 5, the scroll casing 20 and the sub air passage 23 can be made to communicate or not to communicate by opening and closing the sub air passage opening / closing damper 30 of the blower 2. In addition, the air is passed through or bypassed through the heater core 10, and the selected outlet 1
Air can be blown into the vehicle from 4, 15, and 16. Further, also in the vehicle air conditioner 5, similar to the vehicle air conditioner 2, the maximum blower total pressure can always be obtained.

Further, in the vehicle air conditioner 5, the air mix dampers 7 and 8 may be configured to be interlockable with the auxiliary air duct opening / closing damper 30. Specifically, as shown in FIG. 7, the downstream unit 40 is replaced with the downstream unit 40.
b. The downstream unit 40b includes a lever 42 attached to a support shaft 41 of the air mix damper 7.
And the rotational force transmission member 34 connected to the lever 33 of the auxiliary air duct opening / closing damper 30 are connected to each other, and when air is introduced into the heater core 10 by the air mix dampers 7 and 8, the scroll casing 20 and the auxiliary casing The scroll casing 20 and the auxiliary air passage 23 are not communicated with each other so that the air passage 23 is communicated with each other, and when the heater core 10 is closed by the air mix dampers 7 and 8 to prevent air from entering the heater core 10. It is provided in.

In the vehicle air conditioner 5 having the above-described structure, the scroll casing 20 and the sub air passage 23 are not in communication with each other during heating in which the heater core 10 heats the air. As described above, in the heat mode, the relationship between the blower total pressure of the blower 2 and the air volume is suitable for heating, so that the blower total pressure of the blower 2 can be improved. Similarly, in the cooling mode (vent mode) in which the air mix dampers 7 and 8 are moved to allow the air to pass through the bypass passage 43 without entering the heater core 10,
Since the scroll casing 20 and the auxiliary air passage 23 communicate with each other, the total pressure of the blower of the blower 2 can be improved.
Thus, in the vehicle air conditioner 40, the blower total pressure of the blower 2 can be constantly improved in accordance with the operation of the air mix dampers 7 and 8.

Vehicle Air Conditioner According to Fifth Embodiment
Reference numeral 50 denotes the vehicle air conditioner 5 shown in FIG. 6 in which the auxiliary air duct opening / closing damper 30 and the mode damper 12 are provided so as to be interlocked with each other. More specifically, as shown in FIG. 8, the downstream unit 5b is replaced by a downstream unit 50b. The downstream unit 50b includes the lever 33 of the auxiliary air duct opening / closing damper 30 and the support shaft 5 of the mode damper 12.
1 and the lever 52 attached to the rotational force transmission member 34
It is connected with. As a result, the mode damper 12 closes the defroster outlet 15 and opens the vent outlet 14,
In addition, when the mode damper 13 blocks the heat outlet 16, the scroll casing 20 and the auxiliary air passage 23 communicate with each other, and the mode damper 12 causes the vent outlet 1 to communicate.
4 is closed, the defroster outlet 15 is opened, and the mode damper 13 opens the heat outlet 16, the scroll casing 20 and the auxiliary air passage 23 are not in communication.

According to the above-mentioned structure, since the scroll casing 20 and the sub air passage 23 are communicated with each other during cooling in which the air is discharged from the vent outlet 14, as described above, the total blower pressure of the blower 2 is reduced. Can be improved. In addition, the defroster outlet 15 and the heat outlet 16
During heating for discharging the air from the scroll casing 20, the scroll casing 20 and the sub air passage 23 are not in communication with each other, so that the total pressure of the blower of the blower 2 can be improved. Thus, in the vehicle air conditioner 50, the blower total pressure of the blower 2 can be constantly improved according to the selected outlets 14, 15, 16.

Vehicle Air Conditioning System According to Sixth Embodiment
Reference numeral 60 denotes the auxiliary air blow passage 23 of the blower 2 of the vehicle air conditioner 5 shown in FIG. 6 connected to the flow passage 61 on the downstream side of the heater core 10. More specifically, as shown in FIG. In place of the downstream unit 60b. The downstream unit 60b connects the terminal end portion 26 of the auxiliary air passage 23 to the flow passage 61, and uses the auxiliary air passage opening / closing damper 30 also as the air mix damper 8 provided on the outlet side of the heater core 10. is there.

A vehicle air conditioner 60 having the above structure
When the air mix damper 7 provided on the upstream side of the heater core 10 is moved to inject air into the heater core 10, the air mix damper 8 provided on the downstream side interlocks with the air mix damper 7 and To a position away from the heater core 10 so that air can pass through. Accordingly, as described above, the air mix damper 8 closes the terminal end portion 26 of the sub air passage 23 and brings the terminal end portion 26 and the flow passage 61 into a non-communication state, so that the heater core 10 heats the air. Blower 2 during heating
The total pressure of the blower can be improved. Similarly, at the time of cooling in which the air mix dampers 7 and 8 are moved to allow the air to pass through the bypass passage 43 without entering the heater core 10, the end portion 26 of the auxiliary air passage 23 and the flow passage 61 are separated from each other. Since they are communicated with each other, the blower total pressure of the blower 2 can be improved.

Thus, in the vehicle air conditioner 60,
The blower 2 is always operated according to the operation of the air mix dampers 7 and 8.
The total pressure of the blower can be improved. Further, since the air mix damper 8 is also used as the auxiliary air duct opening / closing damper 30 which makes the auxiliary air duct 23 and the scroll casing 20 communicate or not communicate with each other, the constituent members are shown in FIG.
This can be reduced compared to the vehicle air conditioner 40 shown in FIG.

Vehicle Air Conditioning System According to Seventh Embodiment
Reference numeral 70 denotes the ventilating outlet 14 connected to the auxiliary air blow passage 23 of the blower 2 of the vehicle air conditioner 5 shown in FIG. 6, and more specifically, as shown in FIG. It is composed of the side unit 70b. The downstream unit 5b connects the terminal end portion 26 of the auxiliary air passage 23 to the vent outlet 14 and connects the auxiliary air passage opening / closing damper 30.
Is also used as the mode damper 12.

A vehicle air conditioner 70 having the above structure
When the mode damper 12 is moved to close the vent outlet 14, the terminal end portion 26 of the auxiliary air passage 23 and the vent outlet 14 are not in communication with each other, and the air is blown by the heater core 10 during heating. The total pressure of the blower 2 can be improved. Similarly, when the mode damper 12 is moved to open the vent outlet 14, the end portion 26 and the vent outlet 14 communicate with each other, so that the air mix dampers 7 and 8 are moved to prevent air from entering the heater core 10. During cooling in which the bypass passage 43 is passed through, the total blower pressure of the blower 2 can be improved. Further, since the mode damper 12 is configured to serve also as the auxiliary air duct opening / closing damper 30 which makes the auxiliary air duct 23 and the scroll casing 20 communicate or not communicate with each other, the number of constituent members can be reduced.

Further, in the above vehicle air conditioner 70, the air discharged from the terminal end portion 26 is mixed with the air blown out from the vent outlet 14 in the state where the vent outlet 14 is opened. 2 represented by mode
It is effective for modes that require a temperature difference to be blown out from more than one outlet.

In the vehicle air conditioner 70, the terminal end portion 26 of the auxiliary air passage 23 is connected to the vent outlet 14, but it may be connected to the defroster outlet 15 or the heat outlet 16. Good. For example, when the terminal portion 26 is connected to the defroster outlet 15, the vent outlet 14 and the heat outlet 16 are provided so as to be opened and closed by the mode damper 13. During heating in which air mix dampers 7 and 8 are moved to flow air into heater core 10 and air is blown out from heat outlet 16, mode dampers 12 and 13 are moved to close defroster outlet 15 and vent outlet 14. Then, the terminal portion 26 and the defroster outlet 15 are brought into a non-communication state. Thereby, the blower total pressure of the blower 2 can be improved.

The end portion 26 is connected to the heat outlet 16
When the air is blown out from the defroster blowout port 15, the mode dampers 12 and 13 are connected.
Is moved to close the heat outlet 16 and the vent outlet 14 to bring the end portion 26 and the heat outlet 16 into a non-communication state. Thereby, the blower total pressure of the blower 2 can be improved.

Here, a modified example of the sub air passage opening / closing damper 30 provided in the blower 2 will be described. As shown in FIG. 11, the auxiliary air duct opening / closing damper 30a is made of a resin plate or a metal plate having substantially the same size as the opening 25b provided in the outer wall 20a of the scroll casing 20. The auxiliary air duct opening / closing damper 30a is provided with a protrusion 30b and a connecting portion 30c. A groove 25c is formed in one or both of the outer walls 20a of the scroll casing 20 which are divided, and the protrusion 30 is formed in the groove 25c.
b is inset. The wire 3 is connected to the connecting portion 30c.
4a is connected, and the protrusion 34 is
0b slides in the direction of the arrow so that the sub air passage opening / closing damper 30a opens and closes the opening 25b.

Further, it is preferable that the damper 37, the air mix dampers 7, 8 and the mode dampers 12, 13 of the inside / outside air switching device 36 are constructed so as to be operated by a wire or an actuator motor.

The air conditioner 3 for a vehicle shown in FIG. 1 is provided with the blower 2, and the damper 30 of the blower 2 is provided with the third to third.
As shown in the seventh embodiment, the air mix dampers 7 and 8 may be interlocked. In that case, it is preferable that the terminal end portion 26 of the auxiliary air passage 23 bypasses the evaporator 4 and is connected to the downstream side of the heater core 10, the vent outlet 14, and the like.

[0053]

As is apparent from the above description, in the invention according to claim 1, a sub air passage extending in the air blowing direction and in the tangential or substantially tangential direction of the scroll casing is provided on the peripheral wall of the scroll casing. Since it is provided, the ventilation area of the discharge portion can be increased, and the total pressure of the blower required during cooling can be sufficiently improved without substantially increasing the size of the scroll casing.
Further, since the scroll casing and the sub air passage can be changed to the communication state or the non-communication state by the sub air passage opening / closing damper, it is possible to appropriately select the optimum blower total pressure and air flow rate characteristics during both cooling and heating.

According to the second aspect of the present invention, the auxiliary air duct opening / closing damper is interlocked so that the scroll casing and the auxiliary air duct are in communication with each other when the internal air / external air switching device is switched to suck the internal air. In the communicating state, the relationship between the blower total pressure and the air volume is suitable for cooling, so that the total pressure of the blower required when cooling by using the inside air can be sufficiently improved. Similarly, in the state in which the inside / outside air switching device is switched to suck the outside air, the damper is interlocked so that the scroll casing and the sub air passage are not in communication with each other. In the non-communicating state, the relationship between the blower total pressure and the air volume is suitable for heating, so that the total pressure of the blower required when heating using outside air can be sufficiently improved.

According to the third aspect of the invention, the auxiliary air duct opening / closing damper is so arranged that the scroll casing and the auxiliary air duct are in communication with each other when the air mix damper is adjusted so that air does not flow into the heater core (cooling state). Since they are linked, the total pressure of the blower required during cooling can be sufficiently improved. Further, in the state where the air flows into the heater core (heating state), since the damper is interlocked so that the scroll casing and the sub air passage do not communicate with each other, the total pressure of the blower required during heating is sufficiently improved. be able to.

In the invention according to claim 4, in the state where the mode damper is adjusted to blow air from the vent outlet (cooling state), the scroll casing and the auxiliary air passage are in communication with each other, and the defroster blow is performed. In a state where the air is blown out from the outlet and the heat outlet (heating state), the auxiliary air duct opening / closing damper works together so that the scroll casing and the auxiliary air duct do not communicate with each other, so that both cooling and heating are required. The total pressure of the blower can be sufficiently improved.

In the invention according to claim 5, the auxiliary air duct opening / closing damper for making the scroll casing and the auxiliary air duct communicate or not communicate with each other is also used as an air mix damper for adjusting the amount of air passing through the heater core. Therefore, in the state where the damper is adjusted and air is not allowed to flow into the heater core (cooling state), the scroll casing and the auxiliary air passage are in communication with each other. Further, in a state where the damper is adjusted to allow air to flow into the heater core (heating state), the scroll casing and the sub air passage are in a non-communication state. Therefore, the total pressure of the blower required for both cooling and heating can be sufficiently improved. Further, since the damper also serves as the air mix damper, the number of parts is reduced.

Further, in the above invention, since the end portion of the auxiliary air passage is connected to the air passage passing through the heater core arranged on the lee side of the blower, the air passing through the auxiliary air passage and the heater core are passed. Efficiently mixed with air.

According to the sixth aspect of the present invention, the auxiliary air duct opening / closing damper for connecting or disconnecting the scroll casing and the auxiliary air duct is a mode damper for selecting a vent outlet, a defroster outlet, and a heat outlet. Since it is also used as a dual function, when the damper is adjusted and air is blown from the vent outlet (cooling state), the scroll casing and the auxiliary air duct are in communication, and the damper is adjusted to adjust the defroster outlet and heat outlet. In the state where the air is blown out from (the heating state), the scroll casing and the auxiliary air passage are in a non-communication state. Therefore, the total pressure of the blower required for both cooling and heating can be sufficiently improved. Further, since the damper also serves as the mode damper, the number of parts can be reduced.

Further, since the end portion of the sub air passage is connected to any one of the vent air outlet, the defroster air outlet, and the heat air outlet, the air passing through the sub air passage and the end portion. Is efficiently mixed with the air blown out from the air outlet connected to. In addition, since the air blown from the air outlets has a temperature difference compared to the air blown from the other air outlets, the temperature of the air blown from two or more air outlets represented by the bi-level mode is high. Suitable when you need a difference.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a vehicle air conditioner according to a first embodiment.

FIG. 2 is a vertical cross-sectional view of a blower in which a sub air passage is formed.

FIG. 3 is a graph showing the relationship between the blower total pressure and the air volume in a blower with and without a sub-air passage.

FIG. 4 is a vertical cross-sectional view of a blower in which a sub air passage is formed and a sub air passage opening / closing damper is provided.

FIG. 5 is a perspective view of a vehicle air conditioner according to a third embodiment.

FIG. 6 is a cross-sectional view of a vehicle air conditioner according to a fourth embodiment.

FIG. 7 is a partial vertical cross-sectional view of a vehicle air conditioner according to a fourth embodiment.

FIG. 8 is a partial vertical cross-sectional view of a vehicle air conditioner according to a fifth embodiment.

FIG. 9 is a partial vertical cross-sectional view of a vehicle air conditioner according to a sixth embodiment.

FIG. 10 is a vehicle air conditioner according to a seventh embodiment.
FIG.

FIG. 11 is a perspective view showing a modified example of the damper.

FIG. 12 is a vertical cross-sectional view showing a blower of a conventional vehicle air conditioner.

[Explanation of symbols]

1, 2 ... Blower, 3, 5, 35, 50, 60, 70 ... Air conditioner for vehicle 5a ... Upstream unit, 5b ... Downstream unit, 7, 8 ... Air mix damper, 12, 13 ...
Mode damper, 20 ... Scroll casing, 22 ... Fan, 23 ... Sub air passage, 30 ... Sub air passage opening / closing damper.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-80010 (JP, A) JP-A 61-263822 (JP, A) JP-A 61-115709 (JP, A) JP-A 62- 29411 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B60H 1/00-3/06

Claims (6)

(57) [Claims] 1. A vehicle air conditioner comprising a blower for blowing air sucked in by a fan provided in a scroll casing, wherein a sub air passage is provided in the peripheral wall of the scroll casing and in the air blowing direction. An air conditioner for a vehicle, characterized in that a sub air passage opening / closing damper for making the scroll casing and the sub air passage communicate or not communicate with each other is provided in the scroll casing or the sub air passage. 2. The air conditioner for a vehicle according to claim 1, wherein the auxiliary air duct opening / closing damper and an inside / outside air switching device for selectively taking in the inside air or the outside air are interlocked with each other. 3. The vehicle according to claim 1, wherein the sub air passage opening / closing damper and an air mix damper for adjusting an amount of air passing through a heater core arranged on the lee side of the blower are interlocked with each other. Air conditioner. 4. The air conditioner for a vehicle according to claim 1, wherein the sub air passage opening / closing damper and a mode damper for selecting a vent outlet, a defroster outlet, and a heat outlet are interlocked with each other. 5. The end portion of the sub air passage is connected to a flow passage of air passing through a heater core arranged on the lee side of the blower,
The vehicle air conditioner according to claim 1, wherein the sub air passage opening / closing damper is also used as an air mix damper for adjusting the amount of air passing through the heater core. 6. A mode damper for selecting a vent outlet, a defroster outlet, a defroster outlet, and a heat outlet at the end portion of the sub-air passage is also used as the sub-air passage opening / closing damper. The vehicle air conditioner according to Item 1.