JP3447721B2 - 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, and is particularly referred to as an integrated air conditioner in which a cooling heat exchanger and a heating heat exchanger are vertically arranged in a unit case. Belongs to the technical field of things.

[0002]

2. Description of the Related Art Generally, an integrated air conditioner of this type is a unit installed in an instrument panel provided in a front portion of an interior of an automobile, as disclosed in, for example, Japanese Unexamined Patent Publication No. 10-244820. A case is provided, and an introduction port for introducing the air blown by the blower into the unit case is opened at the lower part of the unit case. In this unit case, an evaporator serving as a cooling heat exchanger located above the inlet and a heater core serving as a heating heat exchanger located above the evaporator are provided. Further, in the unit case, in the vehicle rear side of the heater core, there is provided a bypass passage through which the air passing through the evaporator is bypassed to bypass the heater core, and the air flowing to the bypass passage and the air flowing to the heater core are separated from each other. The flow rate is adjusted by the air mix damper.

When the blowing mode set by the occupant of the automobile is the vent mode, the air (cooling air) flowing through the bypass passage alone or the air (heated air) that has passed through the heater core to the cooling air. Are merged and led out to a ventilator from a vent outlet provided in the rear of the vehicle at the upper end of the unit case. On the other hand, when the blowout mode is the defroster mode (heat mode), the heating air alone or the heating air is combined with the cooling air, and the defroster (side) is provided from the defroster outlet provided on the vehicle front side of the vent outlet. Includes a demister to prevent fogging of door windshields). Therefore, the temperature of the air blown from the ventilator or the defroster is determined by adjusting the mixing ratio of the cooling air and the heating air, that is, the flow ratio of the air mix damper.

[0004]

However, in the above-mentioned conventional device, the temperature of the air blown from the ventilator or the defroster is adjusted because the air flow rate of the air flowing to the bypass passage and the air flowing to the heater core is adjusted by one air mix damper. There is a problem that it is difficult to finely adjust. That is, while the air flowing into the heater core is greatly affected by the ventilation resistance due to the heater core, the air flowing into the bypass passage is hardly affected by the ventilation resistance, so the air that has passed through the evaporator easily flows into the bypass passage, Therefore, it is difficult for an appropriate amount of air to flow to the heater core according to the operation of the air mix damper, and it is difficult to finely adjust the temperature.

The present invention has been made in view of the above circumstances, and an object thereof is to enable the temperature of air blown from a ventilator or a defroster to be finely adjusted in the above-described integrated air conditioner. Especially.

[0006]

In order to achieve the above-mentioned object, according to the present invention, a lower wall portion of a heating chamber for accommodating a heating heat exchanger is provided for flowing air into the heating chamber. In addition to the inlet whose opening is adjusted by the air mix damper, an auxiliary inlet whose opening is adjusted by an auxiliary inlet opening / closing damper is provided, and the cooling heat is cooled by this auxiliary inlet opening / closing damper and the air mix damper. Among the air that has passed through the exchanger, the flow rate ratio of the air that flows into the bypass passage and the air that flows into the heating chamber is adjusted.

Specifically, according to the first aspect of the invention, a unit case is provided in a central portion in the vehicle width direction inside an instrument panel provided in a vehicle compartment of the automobile, and an opening is formed in the unit case. In the case, an inlet for introducing air blown by a blower, and arranged in the unit case above the inlet,
A cooling heat exchanger that allows the air introduced from the inlet to pass therethrough and is cooled, and an air that is disposed above the cooling heat exchanger in the unit case and that has passed through the cooling heat exchanger. A heating heat exchanger for passing and heating, provided in the vehicle rear of the heating heat exchanger in the unit case, the air passing through the cooling heat exchanger,
A bypass passage for bypassing the heating heat exchanger and an inlet for accommodating the heating heat exchanger and for allowing the air passing through the cooling heat exchanger to flow into the lower wall were formed. By adjusting the opening of the heating chamber, the inlet opening of the bypass passage, and the inlet of the heating chamber lower wall portion, air that flows into the bypass passage out of the air that has passed through the cooling heat exchanger. And an air mix damper for adjusting the flow rate ratio of the air flowing into the heating chamber, and a wall portion provided in the bypass passage, passing through the heating heat exchanger and between the bypass passage and the heating chamber. The air flowing into the bypass passage through the opening provided in the unit is opened at the merging portion that joins the air flowing in the bypass passage and the upper end of the unit case, and the air in the merging portion of the bypass passage is guided to the ventilator. A vent outlet in order to, an opening in the upper end of the unit case, directed to a vehicle air-conditioning apparatus provided with a defroster outlet for leading out the air in the merging portion of the bypass passage to the defroster.

Then, it is formed on the lower wall of the heating chamber,
The auxiliary flow is provided with an auxiliary inflow port for allowing the air passing through the cooling heat exchanger to flow into the heating chamber together with the inflow port, and an auxiliary inflow opening / closing damper for adjusting the opening degree of the auxiliary inflow port. The inlet opening / closing damper, together with the air mix damper, is configured to adjust a flow rate ratio between the air that has passed through the cooling heat exchanger and the air that flows into the bypass passage and the air that flows into the heating chamber. It is assumed that

With the above-mentioned structure, the inflow area of the air passing through the cooling heat exchanger into the heating chamber is increased by the amount of the auxiliary inlet, so that even if the ventilation resistance of the heating heat exchanger is large, the inlet is large. Alternatively, an appropriate amount of air according to the opening degree of the auxiliary inlet can be surely flown into the heating chamber. As a result, the air mix damper and the auxiliary inlet opening / closing damper make it possible to finely adjust the flow rate ratio between the air flowing into the bypass passage and the air flowing into the heating chamber. Easy temperature adjustment.

According to a second aspect of the present invention, in the first aspect of the present invention, the auxiliary inlet opening / closing damper is such that when the opening degree of the inlet of the heating chamber lower wall portion by the air mix damper is less than a predetermined value. On the other hand, when the opening is larger than the predetermined value, the opening of the auxiliary inlet is made larger as the opening becomes larger.

That is, when the temperature set by the occupant is relatively low and the auxiliary inlet is open, a relatively large amount of air may flow into the heating chamber from the auxiliary inlet.
Delicate temperature control at low temperature setting becomes difficult. However, in the present invention, the auxiliary inlet is closed when the temperature set by the passenger is relatively low, such as when the opening of the inlet of the heating chamber lower wall portion by the air mix damper is less than or equal to a predetermined value, so that the low temperature Delicate temperature control becomes easy even at the time of setting. When the opening is larger than the predetermined value,
As the opening degree increases, the opening degree of the auxiliary inlet increases, so that the temperature of the actual air blown out from the ventilator or defroster should be changed linearly as the occupant changes the set temperature. You can

According to a third aspect of the invention, in the first or second aspect of the invention, the cooling heat exchanger is obliquely arranged so that the vehicle rear side of the cooling heat exchanger is located above the vehicle front side. It is assumed that

As a result, a space for disposing the auxiliary inlet opening / closing damper can be secured in the vehicle front portion between the cooling heat exchanger and the heating heat exchanger, and the opening area of the auxiliary inlet can be increased. Can be quite large.

According to a fourth aspect of the present invention, in any one of the first to third aspects of the invention, the bypass passage is provided in the air mix damper when the air mix damper closes the inlet of the lower wall of the heating chamber. It is assumed that an opening closing portion is provided to cover the opening of the wall portion between the heating chamber and the heating chamber.

That is, when the blowing mode is the vent mode and the temperature set by the occupant is the minimum value, all the air that has passed through the cooling heat exchanger flows through the bypass passage (the inlet and the auxiliary inlet). Is closed)
However, at this time, the air remaining above the heating heat exchanger in the heating chamber is being heated by the heating heat exchanger,
When the opening of the wall between the bypass passage and the heating chamber is in an open state, the heated air flows into the bypass passage through the opening and the temperature of the air blown out from the ventilator is minimized. Can't be maintained. However, according to the present invention, when the air mix damper closes the inlet of the lower wall of the heating chamber, the opening blocking portion covers the opening, so that the flow of the heated air into the bypass passage can be suppressed. it can.

According to a fifth aspect of the present invention, in any one of the first to third aspects of the present invention, the bypass passage is provided in a portion of the bypass passage facing the opening of the wall portion between the bypass passage and the heating chamber. It is assumed that a guide member for guiding a part of the air flowing inside to the opening is provided.

As a result, a part of the air flowing in the bypass passage is guided to the opening by the guide member, so that the dynamic pressure of the air guided to the opening is set when the temperature set by the occupant is at the minimum value. Accordingly, it is possible to prevent the air that remains and is heated above the heating heat exchanger in the heating chamber from flowing into the bypass passage through the opening. Therefore, the same effect as that of the fourth aspect of the invention can be obtained.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 show a vehicle air conditioner 1 (hereinafter, referred to as an air conditioner 1) according to an embodiment of the present invention. The air conditioner 1 is inside an instrument panel 2 provided in a front portion of a vehicle compartment of an automobile. It is installed in. This vehicle is a so-called right-hand drive vehicle in which a driver's seat and a passenger's seat are provided on the right side and the left side of the vehicle, respectively, and a dash panel P separates the engine room at the front of the vehicle from the front side of the vehicle compartment.

The air conditioner 1 has a blower unit 3 for blowing air, an air conditioner unit 4 for introducing air blown from the blower unit 3 to adjust the temperature, and a blower unit 3 for blowing air to the air conditioner unit 4. And an intermediate duct 5 for sending the compressed air.

The air conditioning unit 4 is arranged substantially in the center of the instrument panel 2 in the vehicle width direction, while the air blower unit 3 is separated from the air conditioning unit 4 toward the left side of the vehicle to the passenger seat. It is located in the front. Further, the lower end of the blower unit 3 is positioned above the lower end of the air conditioning unit 4 so as to secure a wide foot space for passengers in the passenger seat.

The blower unit 3 is provided with a casing 6 which is divided into two in the vehicle width direction at a substantially central portion in the vehicle width direction, which are integrated by using a fastener or the like. The upper half of the casing 6 serves as an air intake portion 7 for taking in air to the blower unit 3, while the remaining portion has a blower portion for blowing the taken-in air to the air conditioning unit 4. It is supposed to be 8.

At the upper part of the air intake part 7, an outside air intake 10 for taking in air outside the vehicle compartment and an inside air intake 11 for taking in air inside the vehicle interior are formed. Either one of 10, 11
The inside / outside air switching damper 12, which is operated by an actuator 15 provided on the right side wall of the casing 6, closes the other side while the other side opens. That is, when the outside air intake 10 is fully opened by the inside / outside air switching damper 12, the inside air intake 11 is fully closed, and the outside air intake mode for taking in only the air outside the vehicle compartment is set, while the outside air intake 10 is opened. Is fully closed, the inside air intake port 11 is fully opened, and the inside air circulation mode for taking in only the air in the vehicle compartment is set. A lattice-shaped grill 13 is attached to the inside air intake 11.

On the other hand, a filter arranging portion 21 in which a filter 20 for filtering the air taken in from the outside air inlet 10 or the inside air inlet 11 is arranged is provided below the air intake portion 7. An opening is formed on the vehicle rear side of the filter arrangement portion 21, and the filter 20 can be exchanged through this opening. The blower unit 8 is provided below the filter arrangement unit 21, and inside the blower unit 8, a centrifugal multi-blade fan 23 as a blower has its rotation axis directed vertically. A fan drive motor 24 for driving the fan 23 is provided below the fan 23.

The left end portion of the intermediate duct 5 is connected to the right side wall portion of the casing 6 in the blower section 8. The intermediate duct 5 is formed so as to extend obliquely downward from the left end portion thereof toward the lower end side of the air conditioning unit 4, and the right end portion thereof is opened at the lower end portion of the unit case 30 of the air conditioning unit 4 and The unit case 3
It is connected to an inlet port 25 for introducing air into 0. The intermediate duct 5 has a substantially rectangular cross section that is long in the vehicle front-rear direction, and a control circuit 26 for controlling the rotation speed of the fan drive motor 24 is arranged on the upper wall thereof. .

The air conditioning unit 4 has a unit case 30 which is long in the vertical direction as a whole and is formed in a rectangular box shape larger than the casing 6 of the blower unit 3. The unit case 30 is divided into a bottom wall portion 31 and a main body portion 32 above the bottom wall portion 31, and the main body portion 32 is similar to the blower unit 3 in the above.
It is divided into two parts in the vehicle width direction at a substantially central part in the vehicle width direction, and is composed of a driver seat side part 32a and a passenger seat side part 32b. These driver side 32a and passenger side 32b
Are fastened to each other by screws at a plurality of fastening portions 30a provided so as to project to the outside of the unit case 30. One of the plurality of fastening portions 30a (may be two or more) is provided with a center vent outlet 50 described later.
And the defroster outlet 52.

An evaporator 33 as a cooling heat exchanger for cooling the air introduced into the unit case 30 through the inlet 25 is provided at a position above the inlet 25 in the unit case 30. It is arranged. Further, above the evaporator 33 in the unit case 30, a heater core 34 as a heat exchanger for heating that allows the air passing through the evaporator 33 to pass therethrough is disposed. The air thus introduced into the unit case 30 through the introduction port 25 flows upward from the lower end in the unit case 30.

Although not shown in the drawings, the evaporator 33 is formed by stacking a large number of tubes made of thin metal plates such as aluminum so as to extend in the same direction, and also forming thin metal plates between adjacent tubes. The corrugated fins are interposed. This evaporator 3
A low-temperature refrigerant circulates in the tube of No. 3, and this refrigerant cools the air passing through the evaporator 33. Also, this evaporator 3
In Fig. 3, tanks communicating with the tubes are provided at both ends of the tube, and one of the tanks has an inflow tank portion and an outflow tank portion by a partition plate arranged at the central portion in the stacking direction of the tubes. It is divided into The refrigerant flowing into the inflow tank section flows to one side of the other tank via the upstream tube connected to the inflow tank section, and then the refrigerant flowing to the other side of the other tank is the downstream side. It flows through the tube to the outflow tank portion of the one tank. A cooler pipe is connected to each of the inflow tank portion and the outflow tank portion, and each of the cooler pipes extends from the left side wall portion of the unit case 30 to the outside of the unit case 30 and then extends to the front of the vehicle. Has been formed.

Further, the evaporator 33 is arranged obliquely so that the tube extending direction substantially coincides with the vehicle front-rear direction and the vehicle rear side of the evaporator 33 is located above the vehicle front side. This is an evaporator 33
In order to allow the condensed water generated in the vehicle to flow to a drain portion 35 (described later) in front of the vehicle, a space for installing an auxiliary inlet opening / closing damper 37 described below is provided in the vehicle front side portion between the evaporator 33 and the heater core 34. This is to ensure. All the air introduced into the unit case 30 passes through the evaporator 33.

When the evaporator 33 cools the air, the condensed water generated in the evaporator 33 is discharged to the outside of the vehicle through the drain portion 35 provided in the bottom wall portion 31 of the unit case 30. . The drain portion 35 is provided with a drain passage integrally formed with the bottom wall portion 31 at a vehicle left side portion of the unit case 30 bottom wall portion 31 on the vehicle front end side, and an upstream end of the drain passage is a unit. The opening faces the case 30 so as to project from the left side wall portion of the unit case 30 to the left side of the vehicle, and the downstream side portion of the drain passage extends to the front side of the vehicle.

Similar to the evaporator 33, the heater core 34 is composed of laminated tubes and fins, and engine cooling water is circulated in the tubes so that the air passing through the heater core 34 is heated. It has become. Similarly to the cooler pipes of the evaporator 33, the heater core 34 is also provided with heater pipes for inflowing and outflowing the engine cooling water. The heater pipes extend outward from the left side wall of the unit case 30. It is formed so as to extend to the front of the vehicle after extending to.

A bypass passage 38 is provided in the unit case 30 beside the heater core 34 on the vehicle rear side to allow the air passing through the evaporator 33 to bypass the heater core 34. The bypass passage 38 is provided so as to extend in a substantially vertical direction from an inlet opening 48 provided at substantially the same height as the heater core 34 to an upper wall portion (upper end portion) of the unit case 30.

The heater core 34 is provided in the unit case 3
It is housed in a heating chamber 42 that is partitioned and formed in 0,
The lower wall portion of the heating chamber 42 is located between the evaporator 33 and the heater core 34. And this heating chamber 42
In the rear part of the vehicle in the lower wall part, an inlet port 4 for allowing the air passing through the evaporator 33 to flow into the heating chamber 42.
3 is formed so as to face the inlet opening 48 of the bypass passage 38. Further, an auxiliary inlet 44 for allowing the air passing through the evaporator 33 to flow into the heating chamber 42 together with the inlet 43 is formed in the vehicle front portion of the lower wall portion of the heating chamber 42.

Between the inlet opening 48 of the bypass passage 38 and the inlet 43 of the lower wall portion of the heating chamber 42, the inlet opening 4 is provided.
8 is provided with an air mix damper 36 for adjusting the opening between the inlet 8 and the inlet 43. This air mix damper 36
Is a position (flow direction) in which the inlet opening 48 is fully closed about an axis extending in the vehicle width direction by an actuator 45 arranged on the left side wall of the unit case 30 and an operating mechanism 46 operated by the actuator 45. The inlet 43 is in a fully opened state) and the inlet opening 48 is in a fully opened state (the inlet 43 is in a fully closed state).

An auxiliary inlet opening / closing damper 37 for adjusting the opening of the auxiliary inlet 44 is provided in the lower wall of the heating chamber 42 near the lower side of the auxiliary inlet 44. The auxiliary inlet opening / closing damper 37 is interlocked with the rotation of the air mix damper 36 by the operating mechanism 46, and the auxiliary inlet 44 is fully opened and closed around an axis extending in the vehicle width direction. And the position where the air mix damper 36 is provided.
3 is less than or equal to a predetermined value, the auxiliary inlet 44
On the other hand, when the opening degree of the inflow port 43 is larger than the predetermined value, the opening degree of the auxiliary inflow port 44 is increased as the opening degree is increased.

The operating mechanism 46 is specifically shown in FIG. 7 (note that in FIG. 7, the air mix damper 36 is at a position where the inlet 43 is fully closed and the auxiliary inlet opening / closing damper is shown. 37 is at a position where the auxiliary inlet 44 is fully closed), and the axis X1 is concentric with the air mix damper 36.
A first lever 101 rotatable around the air mix damper 36 and having a long hole 101a formed at its tip.
And a pin 102 that is rotatable about an axis X2 extending in the vehicle width direction and that is fitted into the elongated hole 101a of the first lever 101.
a second lever 102 provided with a and the first lever 1
The third lever 103 rotatable about the same axis X1 as 01 and rotating in the same direction by the rotation of the first lever 101, and the auxiliary inlet opening / closing around the axis X4 concentric with the auxiliary inlet opening / closing damper 37. A fourth lever 104 that is rotatable with the damper 37 and has a long hole 104a formed at its tip, and a long hole 104a of the fourth lever 104 that is rotatable around an axis X5 extending in the vehicle width direction and has its tip. Pins 105 that fit into
a fifth lever 105 provided with a and the third lever 1
Connecting rod 106 for connecting the tip portion of 03 and the intermediate portion between the shaft X5 and the pin 105a of the fifth lever 105.
And have.

The second lever 102 is the actuator 4
When it rotates clockwise about axis X2 in FIG. 7 by 5, the first lever 101 rotates counterclockwise around axis X1. As a result, the air mix damper 36 rotates counterclockwise and the opening degree of the inflow port 43 increases.
Further, the rotation of the first lever 101 causes the third lever 103 to rotate in the counterclockwise direction around the axis X1. The rotation of the third lever 103 causes the fifth lever 105 to rotate in the counterclockwise direction around the axis X5 via the connecting rod 106. At this time, the lever tip end side portion of the elongated hole 104a of the fourth lever 104 has substantially the same shape as the rotation locus of the pin 105a at the tip end of the fifth lever 105, and the fourth lever 104 is Even if the lever 105 rotates, it does not rotate immediately. Then, when the fifth lever 105 rotates by a predetermined amount (the amount corresponding to the predetermined value of the opening degree of the inflow port 43),
The pin 105a comes into contact with the lever base end side portion of the elongated hole 104a, which causes the fourth lever 104 to move to the fifth lever 105
It rotates in the clockwise direction around the axis X4 in conjunction with the rotation of. As a result, the auxiliary inlet opening / closing damper 37 rotates clockwise and the opening degree of the auxiliary inlet 44 increases.

On the other hand, when the air mix damper 36 is in the position to fully close the inlet opening 48 of the bypass passage 38 and the auxiliary inlet opening / closing damper 37 is in the position to fully open the auxiliary inlet 44, When the second lever 102 is rotated clockwise about the axis X2 by the actuator 45, the first lever 101 and the third to fifth levers 103 to 1
05 rotates in the opposite direction to the above. And
First, the auxiliary inlet opening / closing damper 37 completely closes the auxiliary inlet 44, and then the air mix damper 36 is closed.
3 is fully closed.

By rotating the air mix damper 36 and the auxiliary inlet opening / closing damper 37 as described above, the opening degree of the inlet opening 48, the inlet 43, and the auxiliary inlet 44 is adjusted, whereby the evaporator 33 is adjusted. The flow rate ratio of the air that flows into the bypass passage 38 to the air that flows into the heating chamber 42 of the air that has passed through is adjusted. Here, an example of the relationship between the temperature set by the occupant and the operating angles of the air mix damper 36 and the auxiliary inlet opening / closing damper 37 is shown in FIG. 8 (the damper operating angle in FIG. 8 is the bypass for the air mix damper 36). (0 is set when the inlet opening 48 of the passage 38 is in the fully closed position, and 0 is set when the auxiliary inlet opening / closing damper 37 is in the fully opened position).

In the vicinity of the upper wall portion of the unit case 30 in the bypass passage 38, there is provided a first wall portion passing through the heater core 34 and provided between the bypass passage 38 and the heating chamber 42.
A merging portion 38 a is provided in which the air flowing in through the opening 39 merges with the air flowing in the bypass passage 38. In the upper wall portion of the unit case 30 just above the merging portion 38a of the bypass passage 38, the air in the merging portion 38a communicating with the merging portion 38a is supplied to the instrument panel 2.
A center vent outlet port 50 and a side vent outlet port 51 for leading out to a center ventilator 81 and a side ventilator 82, which are respectively provided at substantially the center portion and the left and right end portions in the vehicle width direction, are opened. That is, the center vent outlet 50 is formed in the substantially central portion of the portion of the vehicle rear portion of the upper wall portion of the unit case 30 which is inclined downward toward the vehicle rear side, and the two side vent outlets 51 are formed on both left and right sides thereof. Has been done. In addition, at a substantially central portion in the vehicle width direction of the center vent outlet 50, a joint portion of the driver seat side portion 32a and the passenger seat side portion 32b in the main body portion 32 of the unit case 30 is located.

The center vent outlet 50 is connected to the center ventilator 81 by a center vent duct (not shown) provided in the instrument panel 2.
The side vent outlets 51 are connected to the side ventilators 51 by side vent ducts (not shown) also provided in the instrument panel 2, respectively.
The air in the merging portion 38a of the bypass passage 38 is blown out toward the upper body of the occupant.

A defroster outlet chamber 88 is provided above the heating chamber 42 in the unit case 30, and the bypass passage 38 joins the wall portion between the defroster outlet chamber 88 and the bypass passage 38. A second opening 40 is provided for introducing the air in the portion 38a into the defroster outlet chamber 88. The air that has flowed into the defroster outlet chamber 88 (that is, the air in the merging portion 38a of the bypass passage 38) is placed on the upper wall portion of the unit case 30 at a position near the vehicle front side above the defroster outlet chamber 88 (the instrument panel 2 Defroster lead-out ports 52 are formed for leading out to the demisters 85a provided at both left and right ends of the upper surface. That is, in the upper wall portion of the unit case 30, the center vent outlet 5
The defroster outlet 52 is formed over the entire vehicle width direction in a state in which the defroster outlet 52 is away from the front side of the vehicle and the side vent outlet 51. In addition, at a substantially central portion in the vehicle width direction of the defroster outlet 52, a joint portion of the driver seat side portion 32a and the passenger seat side portion 32b in the main body portion 32 of the unit case 30 is located.

The defroster outlet 52 is connected to the defroster 85 (demister 85a) by a defroster duct (not shown) provided in the instrument panel 2, and the defroster 85 (demister 85a) is led out to the defroster outlet. The air in the chamber 88 is blown toward the inner surface of the windshield of the front window and side doors.

A foot lead-out chamber 91 is provided on the vehicle front side of the defroster lead-out chamber 88 in the unit case 30.
A third opening 92 for allowing the air in the defroster outlet chamber 88 to flow into the foot outlet chamber 91 is formed in the wall portion between the foot outlet chamber 91 and the defroster outlet chamber 88. Further, left and right foot outlets for leading the air in the foot outlet chamber 91 to the feet of the occupants in the driver's seat and the passenger seat are provided at the vehicle front end portions of the upper portions of the left and right side wall portions of the unit case 30. 53 are formed respectively. That is, the left and right foot outlets 53 have left and right foot ducts 56, 56 extending downward along the left side wall portion and the right side wall portion of the unit case 30, respectively.
57 is connected, and both of these foot ducts 56 and 57 are
There are openings at the feet of the occupants in the driver's seat and the passenger's seat, respectively.
The air in the foot lead-out chamber 91 is configured to blow out toward the feet of each occupant through the one opening 55).

Further, the right side (driver's seat side) foot duct 57 communicates with two connecting portions 58 connected to a duct (not shown) extending to the rear seat, and the air in the foot outlet chamber 91 is in the rear seat. It also blows off to the feet of the occupants.

In the vicinity of the center vent outlet 50 and the side vent outlet 51 in the unit case 30, the center vent outlet 50 and the side vent outlet 5 depending on the blowing mode set by the occupant of the vehicle.
One first outlet direction switching damper 60 that simultaneously opens and closes one
Is provided. This first blowing direction switching damper 60
Is the center vent outlet 5 around the axis extending in the vehicle width direction.
0 and the side vent outlet 51 are mutually rotated between a position in which they are fully closed and a position in which they are fully open. The first outlet direction switching damper 60 is located at a position where the center vent outlet 50 and the side vent outlet 51 are fully opened, and the second outlet of the wall portion between the bypass passage 38 and the defroster outlet chamber 88. The part 40 is adapted to be fully closed.

In the vicinity of the defroster outlet 52 in the unit case 30, there is provided a second outlet direction switching damper 61 for opening and closing the defroster outlet 52 according to the outlet mode. The second blowing direction switching damper 61 is configured to rotate about a shaft extending in the vehicle width direction between a position in which the defroster outlet 52 is in a fully closed state and a position in which the defroster outlet 52 is in a fully open state. . The second blowing direction switching damper 61 is located at a position where the defroster outlet 52 is fully opened and the defroster outlet chamber 88 is located in the defroster outlet chamber 88.
The third opening 92 in the wall between the foot outlet chamber 91 and the foot lead-out chamber 91 is fully closed.

The first and second blowing direction switching dampers 6
0 and 61 are rotated by an actuator 63 arranged on the left side wall portion of the unit case 30 and an operation mechanism 62 operated by the actuator 63, and blowout in vent mode, defroster mode, foot mode, etc. The open / closed states of the center vent outlet 50, the side vent outlet 51, the defroster outlet 52, and the third opening 92 are switched according to the mode.

The air mix damper 36 has a wall portion between the bypass passage 38 and the heating chamber 42 when the air mix damper 36 fully closes the inlet 43 of the lower wall portion of the heating chamber 42. Opening block 3 that covers the first opening 39
6a is provided. The opening blocking portion 36a is provided in the heating chamber 42 when the blowing mode is the vent mode and the temperature set by the occupant is the minimum value.
The air that remains on the upper side of the No. 4 and is heated by the heater core 34 is prevented from flowing into the bypass passage 38 from the first opening 39.

A pair of case-integrated bracket portions 68 are provided on the left and right sides of the blower unit 8 of the blower unit 3 as mounting portions for a vehicle, and on the right side of the filter arrangement portion 21, the vehicle right side is provided. A case-integrated bracket portion 69 is provided so as to project obliquely upward toward.
On the other hand, the mounting portion of the air conditioning unit 4 includes a flange 70 integrally formed with the drain portion 35 and a pair of flanges 71 provided on both the left and right sides of the upper portion of the unit case 30.
Consists of.

While the through holes are formed in the flanges 68 to 71 of the blower unit 3 and the air conditioning unit 4, the stud bolts are formed in the dash panel P so as to correspond to the positions of the through holes. Is attached. Further, the dash panel P is formed with through holes corresponding to the positions of the cooler pipe and the heater pipe of the evaporator 33 and the heater core 34, and the drain passage of the drain portion 35. Then, when the blower unit 3 and the air conditioning unit 4 are positioned on the dash panel P by inserting stud bolts into the through holes in the respective flanges 68 to 71, the cooler pipe and the heater pipe are inserted from the through holes of the dash panel P to the engine room. Come to face. In this state, the blast bolt 3 and the air conditioning unit 4 are fixed to the dash panel P by screwing the nuts onto the stud bolts, and the pipes in the engine room are connected to the respective pipes to form a drain. A drain pipe is connected to the drain passage of the portion 35.

Next, the flow of air in the air conditioning unit 4 will be described. First, the fan 23 of the blower unit 3 will be described.
The air blown by the air passes through the intermediate duct 5 and the inlet 2
5 is introduced into the unit case 30.

Subsequently, the air introduced into the unit case 30 flows upward immediately after being introduced and passes through the evaporator 33, and is cooled by the evaporator 33 at this time. If the inlet 43 and the auxiliary inlet 44 of the lower wall portion of the heating chamber 42 and the inlet opening 48 of the bypass passage 38 are all in the open state, a part of the air (cooling air) that has passed through the evaporator 33 is the inlet. 43 and auxiliary inlet 4
4 flows into the heating chamber 42, while the remaining air flows from the inlet opening 48 of the bypass passage 38 to the bypass passage 38.
It flows in and rises. The flow rate ratio between the air flowing into the bypass passage 38 and the air flowing into the heating chamber 42 is determined by the air mix damper 36.
Of the inlet opening 48 and the inlet 43 of the lower wall of the heating chamber 42 and the opening of the auxiliary inlet 44 by the auxiliary inlet opening / closing damper 37.

The air flowing into the heating chamber 42 rises and passes through the heater core 34, and is heated by the heater core 34 at this time, and the heated air (heating air) flows between the bypass passage 38 and the heating chamber 42. First provided on the wall between
The cooling air flowing in the bypass passage 38 flows into the merging portion 38 a of the bypass passage 38 through the opening 39 and merges with the cooling air. The center vent outlet 50 and the side vent outlet 51 have the first outlet direction switching damper 60 as in the case where the outlet mode is the defroster mode or the foot mode.
When it is in a fully closed state due to
The heated air flowing into the a merges with the cooling air flowing in the bypass passage 38, and the heating air and the cooling air are mixed at the merging portion 38a to form a wall between the bypass passage 38 and the defroster outlet chamber 88. Second opening 40 provided in the section
And is introduced into the defroster outlet chamber 88. The air introduced into the defroster lead-out chamber 88 is led out to the defroster 85 (demister 85a) from the defroster lead-out port 52 or flows into the foot lead-out chamber 91 from the third opening 92 depending on the blowing mode. After that, it is led out from the foot outlet 53 through the left and right foot ducts 56 and 57 to the feet of the occupants in the driver's seat, the passenger's seat and the rear seat.

On the other hand, when the center vent outlet 50 and the side vent outlet 51 are open as in the case where the blowout mode is the vent mode, the heated air flowing into the merging portion 38a of the bypass passage 38 is cooled. It joins with air and is led out to the center ventilator 81 and the side ventilator 82 from the center vent outlet 50 and the side vent outlet 51, respectively.

When the blowing mode is the vent mode and the temperature set by the occupant is the minimum value, the inlet 43 and the auxiliary inlet 44 of the lower wall of the heating chamber 42 are fully closed and pass through the evaporator 33. All of the generated air flows through the bypass passage 38, but at this time, the opening closing portion 36 a provided in the air mix damper 36 causes the first opening portion 39 of the wall portion between the bypass passage 38 and the heating chamber 42 to be closed. Since the air is covered, the air remaining on the upper side of the heater core 34 in the heating chamber 42 and heated by the heater core 34 is less likely to flow into the bypass passage 38 from the first opening 39. On the other hand, the opening closing portion 36a is provided with the air mix damper 36.
Moves to the side of the heating chamber 42 as it rotates in the direction to open the inflow port 43, which makes it easier for the air in the heating chamber 42 to flow into the bypass passage 38 from the first opening 39.

Therefore, in the above embodiment, the heating chamber 4
In addition to the inflow port 43, which is provided in the lower wall portion of 2 for flowing air into the heating chamber 42 and whose opening is adjusted by the air mix damper 36, the opening is adjusted by the auxiliary inlet opening / closing damper 37. An auxiliary inflow port 44 is provided, and the auxiliary inflow opening / closing damper 37 and the air mix damper 36 allow the air that has passed through the evaporator 33 to flow into the bypass passage 38 and the air that flows into the heating chamber 42. Is configured to adjust the flow rate of the air, the inflow area of the air that has passed through the evaporator 33 into the heating chamber 42 is increased by the amount of the auxiliary inlet 44, which increases the ventilation resistance of the heater core 34. Also, an appropriate amount of air according to the opening degree of the inflow port 43 or the auxiliary inflow port 44 can surely flow into the heating chamber 42. As a result, the air mix damper 36 and the auxiliary inlet opening / closing damper 37 can finely adjust the flow rate ratio between the air flowing into the bypass passage 38 and the air flowing into the heating chamber 42. It becomes easy to finely adjust the temperature of the air blown from the side ventilator 82, the defroster 85, and the like.

Further, the auxiliary inlet opening / closing damper 37 is provided with the inlet 4 of the lower wall portion of the heating chamber 42 by the air mix damper 36.
3 is less than or equal to a predetermined value, the auxiliary inlet 44
On the other hand, when the opening is larger than the predetermined value, the opening of the auxiliary inlet 44 is increased as the opening becomes larger. Since it is configured as described above, delicate temperature control becomes easy especially at low temperature setting, and the temperature of the actual air blown from the center ventilator 81, the side ventilator 82, the defroster 85, etc. can be changed by the occupant. It can be changed linearly.

Here, the results of an actual experiment are shown in FIGS. 9 and 10 (FIG. 9 shows when the blowout mode is the defroster mode, and FIG. 10 shows when it is the vent mode). That is, as described above, the air mix damper 36
The auxiliary inlet 44 is closed when the opening of the inlet 43 of the lower wall of the heating chamber 42 is less than a predetermined value (Example 1), and the opening of the inlet 43 becomes zero. What is prepared so that the opening degree of the auxiliary inflow port 44 is just 0 (Example 2) is prepared, and what is the actual temperature blown out from the center ventilator 81 due to the change in the set temperature by the occupant? I checked. As a result, it can be seen that the linearity of Example 1 is better at the low temperature setting. This is because if the auxiliary inlet 44 is open when the temperature set by the occupant is relatively low, a relatively large amount of air flows from the auxiliary inlet 44 into the heating chamber 42 and the temperature tends to rise. Is. However, even in the second embodiment, the auxiliary flow inlet 44 is not provided and one air mix damper 36 is used to adjust the flow rate ratio between the air flowing into the bypass passage 38 and the air flowing into the heating chamber 42. Compared to the one, the linearity is quite good.

Further, in the above embodiment, the air mix damper 36 is provided with the heating chamber 42.
Since the opening closing portion 36a that covers the first opening portion 39 of the wall portion between the bypass passage 38 and the heating chamber 42 is provided when the inflow port 43 of the lower wall portion is closed, the blowing mode is vented. When the mode is set and the temperature set by the occupant is the minimum value, the air that remains above the heater core 34 in the heating chamber 42 and is heated by the heater core 34 is less likely to flow into the bypass passage 38 from the first opening 39. Therefore, the temperature of the air blown out from the center ventilator 81 and the side ventilator 82 can be maintained as low as possible.

In the above embodiment, the bypass passage 38 is provided to the air mix damper 36 when the air mix damper 36 closes the inlet 43 of the lower wall portion of the heating chamber 42.
Although the opening closing portion 36a that covers the first opening 39 of the wall portion between the heating chamber 42 and the heating chamber 42 is provided, instead of providing such opening closing portion 36a in the air mix damper 36, for example, as shown in FIG. The guide member 11 that guides a part of the air flowing in the bypass passage 38 to the first opening 39 in a portion of the bypass passage 38 facing the first opening 39.
You may make it arrange | position 0. With this configuration, when the temperature set by the occupant is at the minimum value, the heated air flows into the bypass passage 38 from the first opening 39 due to the dynamic pressure of the air guided to the first opening 39. Can be suppressed, and the same operational effect as in the case of providing the opening blocking portion 36a as described above can be obtained.

In the above embodiment, the air conditioner 1 is mounted on the right-hand drive vehicle, but it may be installed on the left-hand drive vehicle. In this case, the air conditioner 1 may be configured so that the left and right are in a relationship that is substantially opposite to that of the above embodiment.

[0062]

As described above, according to the vehicle air conditioner of the present invention, the lower wall portion of the heating chamber is provided for flowing air into the heating chamber and the opening degree is adjusted by the air mix damper. In addition to the air inlet, an auxiliary inlet whose opening is adjusted by an auxiliary inlet opening / closing damper is provided, and this auxiliary inlet opening / closing damper, together with the air mix damper, flows into the bypass passage and the heating chamber. Since it is configured to adjust the flow rate ratio with the air to be generated, the flow rate ratio can be finely adjusted, and the delicate temperature adjustment of the air blown from the ventilator or the defroster can be easily performed.

[Brief description of drawings]

FIG. 1 is a perspective view showing a vehicle air conditioner according to an embodiment of the present invention.

FIG. 2 is a perspective view of the vehicle air conditioner seen from a direction different from that in FIG.

FIG. 3 is a view of the vehicle air conditioner viewed from the vehicle rear side.

FIG. 4 is a perspective view showing an instrument panel.

FIG. 5 is a view corresponding to FIG. 3 showing an outline of a vehicle air conditioner.

FIG. 6 is a vertical cross-sectional view of an air conditioning unit of the vehicle air conditioner.

FIG. 7 is a view showing an operating mechanism of an air mix damper and an auxiliary inlet opening / closing damper.

FIG. 8 is a graph showing the relationship between the temperature set by the occupant and the operating angles of the air mix damper and the auxiliary inlet opening / closing damper.

FIG. 9 is a graph showing the relationship between the temperature set by the occupant and the actual temperature blown out from the center ventilator in the defroster mode.

FIG. 10 is a graph showing the relationship between the temperature set by the occupant and the actual temperature blown out from the center ventilator in the vent mode.

FIG. 11 is a view corresponding to FIG. 6 showing a modified example in which a guide member is provided in the bypass passage.

[Explanation of symbols]

1 Vehicle air conditioner 2 Instrument panel 23 Centrifugal multi-blade fan (blower) 25 entrance 30 unit case 33 Evaporator (cooling heat exchanger) 34 Heater core (heat exchanger for heating) 36 Air Mix Damper 36a Opening closing part 37 Auxiliary inlet opening / closing damper 38 Bypass passage 38a Confluence part 39 First opening 42 heating chamber 43 Inlet 44 Auxiliary inlet 48 entrance opening 50 Center vent outlet 51 Side vent outlet 52 Defroster outlet 81 Center ventilator 82 Side ventilator 85 Defroster 110 Guide member

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-10-244820 (JP, A) JP-A-10-250345 (JP, A) JP-A-62-71717 (JP, A) Actual development Sho-57- 37605 (JP, U) Actually developed 60-49008 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B60H 1/00-3/06

Claims (5)

(57) [Claims] 1. A unit case disposed in a central portion in a vehicle width direction inside an instrument panel provided in a vehicle compartment of an automobile, and air blown by a blower into the unit case, the unit case being opened. An inlet for introducing air, a cooling heat exchanger that is disposed above the inlet in the unit case and cools the air introduced from the inlet by passing it, and the inside of the unit case And a heating heat exchanger which is disposed above the cooling heat exchanger and heats by passing the air passing through the cooling heat exchanger, and a vehicle of the heating heat exchanger in the unit case. A bypass passage that is provided in the rear and that allows the air that has passed through the cooling heat exchanger to flow by bypassing the heating heat exchanger; By adjusting the opening of the heating chamber in which the inflow port for inflowing the air that has passed through the heat rejection heat exchanger is formed, the opening of the inlet opening of the bypass passage and the inflow port of the heating chamber lower wall portion, An air mix damper that adjusts a flow rate ratio of the air that flows into the bypass passage and the air that flows into the heating chamber among the air that has passed through the cooling heat exchanger; and A confluent portion where the air that has passed through the heat exchanger for use and has flowed into the bypass passage from the opening provided in the wall portion between the bypass passage and the heating chamber merges with the air flowing through the bypass passage, and the unit case A vent outlet opening at the upper end of the bypass passage for leading the air in the confluence portion of the bypass passage to the ventilator, and a confluence portion of the bypass passage at the upper end portion of the unit case. A vehicle air conditioner having a defroster outlet for letting air out to a defroster, the air being formed on the lower wall of the heating chamber and passing through the cooling heat exchanger together with the inlet. An auxiliary inlet for flowing into the heating chamber and an auxiliary inlet opening / closing damper for adjusting the opening degree of the auxiliary inlet are provided, and the auxiliary inlet opening / closing damper, together with the air mix damper, perform the cooling heat exchange. An air conditioner for a vehicle, which is configured to adjust a flow rate ratio of air that flows into the bypass passage and air that flows into the heating chamber among the air that has passed through the air conditioner. 2. The vehicle air conditioner according to claim 1, wherein the auxiliary inlet opening / closing damper operates the auxiliary inlet when the opening degree of the inlet of the heating chamber lower wall portion by the air mix damper is equal to or less than a predetermined value. On the other hand, when the opening degree is larger than the predetermined value, the vehicle air conditioner is configured to increase the opening degree of the auxiliary inlet as the opening degree increases. 3. The vehicle air conditioner according to claim 1, wherein the cooling heat exchanger is arranged obliquely so that the vehicle rear side of the cooling heat exchanger is located above the vehicle front side. A vehicle air conditioner characterized by being 4. The vehicle air conditioner according to claim 1, wherein the air mix damper has a bypass when the air mix damper closes an inlet of a heating chamber lower wall portion. An air conditioner for a vehicle, characterized in that an opening closing portion is provided to cover an opening portion of a wall portion between the passage and the heating chamber. 5. The vehicle air conditioner according to claim 1, wherein the bypass is provided in a portion of the bypass passage facing the opening of the wall portion between the bypass passage and the heating chamber. A vehicle air conditioner comprising a guide member for guiding a part of the air flowing in the passage to the opening.