JP3496231B2 - 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 having a function of mixing cold air and hot air.

[0002]

2. Description of the Related Art In some air conditioners of this type, the temperature of air blown from a vent outlet of a passenger compartment is lower than the temperature of air blown from a foot outlet of a passenger compartment during heating to cause a vertical temperature difference in the passenger compartment. . An example thereof is shown in FIG. The apparatus shown in the drawing is a vent flow path 3 that guides the air taken into the air conditioning duct 1A and adjusted in temperature to a desired temperature in the temperature control unit 2 to a vent outlet of a vehicle compartment,
A vent door 4 that rotates at the inlet position of the vent flow path 3 to open and close the vent flow path 3, and a foot door that opens and closes an opening FD for discharging the air that has passed through the temperature control unit 2 to the foot outlet of the vehicle compartment. 5, the fresh vent flow path 6 that bypasses the air taken in the air conditioning duct 1A from the temperature control section 2 and guides it to the downstream position of the vent door 4, and the fresh vent flow path 6 rotates at the inlet position of the fresh vent flow path 6 A fresh vent door 7 that opens and closes the flow path 6 is provided. When the vent door 4 and the foot door 5 are opened to introduce the air whose temperature is controlled by the temperature control unit 2 to the vent outlet and the foot outlet, the fresh vent door 6 is opened. A part of the air that is opened and taken into the air conditioning duct 1A is directly guided from the fresh vent flow channel 6 to the vent flow channel 3 and merged with the air from the temperature control unit 2, thereby venting. Lowering the outlet temperature of the mouth than the outlet temperature from the foot air outlet.

The temperature control section 2 is an air mix door 2
0 is rotated around the shaft 20a to adjust the opening amount of the front surface 21a of the heater core 21 so that the warm air passing through the heater core 21 and the cold air passing through the gap S on the side of the heater core 21 join together. It is a well-known device that obtains air having a temperature corresponding to the rotational position of the air mix door 20. The warm air from the opening FD may also be guided to the differential air outlet of the vehicle compartment. The fresh vent flow path 6 and the fresh vent door 7 are provided for discharging the cool air from the vent outlet regardless of the position of the vent door 4, and are disclosed in, for example, JP-A-63-31813 and JP-A-3-143718.
It is disclosed in Japanese Laid-Open Patent Publication No. 3-82609. Hereinafter, the function of discharging cold air from the vent outlet through the fresh vent channel will be referred to as the fresh vent function.

FIG. 6 shows another example of an air conditioner which realizes a vertical temperature difference. This device is provided with a differential temperature forming flow path 8 that bypasses the temperature adjusting section 2 of the air conditioning duct 1B separately from the fresh vent flow path 6, and opens and closes the differential temperature forming flow path 8 at the inlet of the differential temperature forming flow path 8. When the vent door 4 and the foot door 5 are opened to guide the air of the temperature control unit 2 to both the vent outlet and the foot outlet, the bilevel door 9 is provided as shown by a solid line in the figure. A part of the air that is opened to the air conditioning duct 1B and is introduced into the air-conditioning duct 1B is guided to the temperature difference forming flow path 8 so that the air from the temperature adjusting unit 2 and the air from the temperature difference forming flow path 8 are positioned upstream of the vent door 4. And the temperature of the air toward the vent channel 3 is lowered.

In the present specification, the air outlet at the occupant's chest position in the passenger compartment is called a vent air outlet, the air outlet at the occupant's foot position is called a foot air outlet, and a window side air outlet differential air outlet. Further, hereinafter, a mode in which the air that has passed through the temperature control section of the air conditioning duct is discharged from both the vent outlet and the foot outlet is referred to as a bi-level mode.

[0006]

The above-mentioned conventional devices have the following problems, respectively. First, since the device of FIG. 5 merges the air from the temperature control unit 2 and the air from the fresh vent flow passage 6 downstream of the vent door 4, the distance from the air merging position to the vent outlet is short. As a result, sufficient air mixing is not performed, and the temperature at the vent outlet is unstable. On the other hand, in the device of FIG. 6, the air from the temperature control unit 2 and the air from the temperature difference forming flow passage 8 are joined together upstream of the vent door 4, so that the air mixing performance is higher than that of the device of FIG. The temperature blown out from the vent outlet becomes stable. However, fresh bent door 7
Since two doors, a bi-level door 9 and a bi-level door 9, are separately driven by dedicated actuators (not shown), the number of parts increases, the cost rises, and the assembly work and maintenance of the device are complicated. Become.

An object of the present invention is to provide a vehicle air conditioner capable of realizing a fresh vent function and a stable vertical temperature difference in a bilevel mode and reducing the number of parts.

[0008]

1 to 4, which show an embodiment, the invention of claim 1 is such that the heating amount of the air A1 taken into the air conditioning duct 10 is adjusted. A temperature control unit 2 for controlling the temperature of A1 to a desired temperature, a vent flow channel 3 for guiding the air passing through the temperature control unit 2 to a vent outlet of a vehicle compartment, and a vent door 4 for opening and closing the vent flow channel 3. It is applied to a vehicle air conditioner including. And the temperature control unit 2
Is formed on the side of the air conditioning duct 10 and forms a differential temperature forming flow path 112 that bypasses the air A1 taken into the air conditioning duct 10 and linearly guides it to the upstream position of the vent door 4 and forms the differential temperature. A sub-duct 1 having a curved portion 11a of a constant length formed on the side wall surface along the flow direction of the flow path 112.
1 and a fresh vent opening 115 provided on the upper side surface of the sub-duct 11 so as to match the formation range of the curved portion 11a.
Through the temperature difference forming flow path 112 and introduces the air taken into the air conditioning duct 10 to the downstream position of the vent door 4 above the air conditioning duct, and the fresh vent flow path 6 in the sub duct 11. The branch position of the first position (the position of FIG. 3A) to the second position (the position of FIG. 3).
(Position (b)) to rotate along the curved portion 11a,
From the second position to the third position (Fig. 3 (c), Fig. 1 position)
It is provided so as to rotate beyond the curved portion 11a toward the upper end, closes both the fresh vent flow channel 6 and the differential temperature forming flow channel 112 at the first position, and changes the differential temperature from the first position to the second position. Only the fresh vent channel 6 is opened through the fresh vent opening 115 while the forming channel 112 is closed, and both the fresh vent channel 6 and the differential temperature forming channel 112 are opened from the second position to the third position. By providing a single detour opening / closing door 114, the above-mentioned object is achieved.

[0009]

When the bypass opening / closing door 114 is moved to the first position, the temperature difference forming flow passage 112 and the fresh vent flow passage 6 are moved.
Both of them are closed, and the air whose temperature is adjusted by the temperature adjustment unit 2 is guided as it is to the foot outlet of the vehicle compartment and discharged. When moved to the second position, the fresh vent channel 6 is opened and part of the cold air A1 taken into the air conditioning duct 10 is guided from the fresh vent channel 6 to the downstream of the vent door 4 and discharged from the vent outlet. To be done. When the air is moved to the third position, a part of the cold air A1 taken into the air conditioning duct 10 is guided to the upstream side of the vent door 4 through the temperature difference forming flow path 112, and the air whose temperature is adjusted by the temperature adjustment unit 2 is adjusted. Is cooled by the air A2 from the temperature difference forming flow channel 112 and then flows into the vent flow channel 3.

Incidentally, in the section of means and action for solving the above problems for explaining the constitution of the present invention, the drawings of the embodiments are used for the purpose of making the present invention easy to understand. It is not limited to.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The same parts as those of the conventional example shown in FIGS. 5 and 6 are designated by the same reference numerals, and the description thereof will be omitted.
In FIG. 1, reference numeral 10 denotes an air conditioning duct, and inside thereof, a temperature control unit 2, a vent flow passage 3, a vent door 4,
A foot door 5 and a fresh vent channel 6 are provided. The sub-duct 1 is provided on the side of the temperature control unit 2 of the air conditioning duct 10.
1 is provided. As shown in detail in FIG. 2, the sub-duct 11 has a rectangular inlet 110 for taking in a part of the air A1 sent to the temperature control unit 2 and a bi-level lined up with the inlet 110 at a constant distance. And an opening 111. Due to the internal flow path from the intake port 110 to the bi-level opening 111, a part of the air A1 taken into the air conditioning duct 10 is diverted from the temperature control unit 2 to the upstream position of the vent door 4 in the air conditioning duct 10. The temperature difference forming flow path 112 that leads to is formed linearly along the flow direction of the air A1.

Inside the sub-duct 11, there is provided a bypass door 114 which is rotationally driven by a not-shown actuator around a rotary shaft 113 along the lower end of the intake port 110 (lower side in FIG. 1). This bypass door 114
Has the same size as the intake port 110, and the intake port 110 is completely closed when the bypass door 114 is raised to the upright position as shown in FIG. Sub duct 1
On the upper wall connected to the intake port 110 of No. 1, the bypass door 11
Bending part 1 that bends a certain length along the movement trajectory of the upper end of 4
1a is formed. As shown in FIG. 3C, when the upper end of the bypass door 114 moves over the curved portion 11a toward the bilevel opening 111, the air A2 flows into the temperature difference forming flow passage 112.
Flows in.

On one side wall 11b of the sub-duct 11,
A fan-shaped fresh vent opening 115 centering on the rotation shaft 113 of the bypass door 114 is provided. The fresh vent channel 6 of the air conditioning duct 10 is provided with a temperature difference forming channel 112 in the sub duct 11 through the fresh vent opening 115.
Communicate with. In other words, the differential temperature forming flow channel 112 and the fresh vent flow channel 6 are branched at the fresh vent opening 115. The range in which the fresh vent opening 115 is formed matches the range in which the curved portion 11a of the sub-duct 11 is formed. As a result, in the range in which the bypass door 114 separates from the intake port 110 and rotates on the curved portion 11a, only the fresh vent opening 115 is formed. The air A3 is discharged and guided to the fresh vent channel 6.

Next, the operation of the air conditioner of this embodiment will be described. First, when the vent door 4 is closed and the air that has passed through the temperature control unit 2 is discharged from the opening FD on the foot door 5 side, the bypass door 4 is made to stand upright as shown in FIG. Close. As a result, both the differential temperature forming flow passage 112 and the fresh vent flow passage 6 are closed, and the air heated to the desired temperature in the temperature adjusting unit 2 is discharged from the opening FD and guided to the foot blowout opening and the differential blowout opening. .

When it is desired to operate the fresh vent function while discharging warm air from the foot outlet and the differential outlet, the bypass door 114 is removed from the curved portion 11a with the vent door 4 closed as shown in FIG. 3 (b). The fresh vent opening 115 is opened by falling in a range that does not exist. As a result, a part of the cold air A1 taken into the air conditioning duct 10 is taken into the sub-duct 11 and flows into the fresh vent passage 6 from the fresh vent opening 115, and this air A3 passes through the vent passage 3 and the vent outlet. Be led to.

In the bi-level mode in which both the vent door 4 and the foot door 5 are opened, as shown in FIG. 3 (c), the bypass door 4 is pushed over the curved portion 11a toward the bi-level opening 111 side, and the temperature difference is raised. The formation channel 112 is opened. As a result, the air flowing from the temperature control unit 2 to the vent flow path 3 and the cool air A2 that has passed through the temperature difference forming flow path 112 merge together just before the vent door 4, and the temperature control unit 2 passes through the vent flow path 3. Air that is cooler than the air that flows in flows in. On the other hand, on the opening FD side of the air conditioning duct 10, the differential temperature forming flow path 112
Since it is sufficiently distant from the bi-level opening 111, the cooling effect by the air A2 from the temperature difference forming flow passage 112 is hardly received, and therefore the air having a temperature substantially equal to the temperature control temperature in the temperature control unit 2 is opened from the opening FD. _AF is discharged. Then, the air that has flowed into the vent channel 3 is further cooled by the air A3 from the fresh vent channel 6. As a result, the temperature of the air A _V discharged from the vent outlet changes to the opening FD.
The temperature is sufficiently lower than the temperature of the air A _F guided from the vehicle to the foot outlet, and a clear vertical temperature difference occurs in the vehicle interior.

In the above bi-level mode, the cold air A2 bypassing the temperature control unit 2 merges with the warm air from the temperature control unit 2 upstream of the vent door 4, so that it is compared with the conventional example shown in FIG. Then, the mixture of warm air and cold air toward the vent outlet is improved, and the temperature of air blown out from the vent outlet is stabilized. Moreover, since the fresh vent function and the formation of the temperature difference between the upper and lower sides in the bi-level mode are performed by the single bypass door 4, the number of parts is reduced as compared with the conventional example shown in FIG. 6, and the assembling work and maintenance work of the device are reduced. Is also reduced. In the bilevel mode, it is possible to adjust the flow rate of the air A2 by changing the opening position of the temperature difference forming flow passage 112 by changing the rotational position of the bypass door 114.

In the apparatus of this embodiment, when the air mix door 20 of the temperature control section 2 covers the front surface 21a of the heater core 21 in a full cool state, the bypass door 114 is tilted to a horizontal position as shown in FIG. The temperature forming flow path 112 is fully opened. As a result, the cold air A1 taken into the air conditioning duct 10 flows straight to the vent door 4 side through the gap S of the temperature control unit 2 and the temperature difference forming flow path 112, so that a large flow rate is secured without increasing ventilation resistance. can do. In this regard, in the conventional example shown in FIG. 5, the air A directed to the temperature control unit 2
Since the fresh vent flow path 6 is bent one step with respect to the flow direction of 1, the flow rate is lower and the ventilation resistance is higher than that of the present embodiment if the temperature adjusting section 2 is the same.

1 to 3, the air conditioning duct 1 is shown for convenience.
Since 0 is shown in a plan view, the bypass door 114, the vent door 4, and the foot door 5 are shown to be rotatable about the axis in the same direction. However, in reality, as shown in FIG. It is possible to dispose the vent door 4 rotatably at the bottom of the vent door 4 and attach the sub-duct 11 so that the fresh vent opening 115 thereof faces the vent door 4 side.

In the correspondence between the above embodiment and the claims,
The bypass door 114 constitutes a bypass opening / closing door, and FIG.
The upright position of the bypass door 114 shown in (a) is the first position, and the position where the bypass door 114 is tilted to the rear end of the bending portion 11a shown in FIG. 3 (b) is the second position.
The third position is a position (including both the position shown in FIG. 3C and the position shown in FIG. 1) in which the bypass door 114 is further tilted down than the position shown in FIG. 3B.

In this embodiment, the bypass door 114 is rotated around the lower end of the intake port 110 of the sub-duct 11, but various modifications such as rotation around the upper end of the intake port 110 are possible. Further, the detour opening / closing door is not limited to the rotary type, but the inlet of the fresh vent channel and the inlet of the temperature difference forming channel may be aligned, and a single door may be slid in the direction in which they are aligned. A door may be provided so that the fresh vent channel 6 is closed when the temperature difference forming channel 112 is opened. The configuration of the temperature control unit 2 is not limited to the one that depends on the opening of a single air mix door, and any details may be used as long as the temperature of the air taken into the air conditioning duct can be raised to a desired temperature.

[0022]

As described above, according to the present invention,
By changing the position of a single detour opening / closing door, the fresh vent function and vertical temperature difference in the bi-level mode can be realized. In the bi-level mode, the air heading from the temperature control section to the vent outlet and the temperature control section were bypassed. It is possible to combine air with the upstream of the vent door to stabilize the temperature of the air blown out from the vent outlet, further reduce the number of parts to reduce the cost, and reduce the man-hours for assembling the device and the maintenance labor.

[Brief description of drawings]

FIG. 1 is a diagram showing a structure inside an air conditioning duct according to an embodiment of the present invention.

FIG. 2 shows the structure around the bypass door in FIG.
The perspective view which shows the state seen from the II direction.

FIG. 3 is a view showing the operation of the bypass door in the apparatus of FIG. 1, in which (a) shows only the differential temperature forming flow path and the fresh vent flow path, and (b) shows only the fresh vent flow path. When opened, (c) shows the case of the bilevel mode.

FIG. 4 is a perspective view illustrating an example of arrangement of respective doors in the air conditioning duct of FIGS. 1 to 3.

FIG. 5 is a view showing a structure inside an air conditioning duct in a conventional device.

FIG. 6 is a diagram showing a structure inside an air conditioning duct in another conventional device.

[Explanation of symbols]

2 temperature control section 3 vent channels 4 vent door 6 Fresh vent channel 10 Air conditioning duct 11 sub duct 110 Sub-duct intake 111 Bi-level opening 112 Differential temperature forming channel 114 Bypass door (detour opening / closing door) 115 Fresh vent opening

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B60H 1/00-3/06

Claims (2)

(57) [Claims] 1. A temperature control unit for controlling a heating amount of air taken into an air conditioning duct to control the temperature of the air to a desired temperature, and air passing through the temperature control unit to a vent outlet of a vehicle compartment. In a vehicle air conditioner including a vent flow path for opening and a vent door that opens and closes the vent flow path, the air that is disposed on a side of the temperature control unit and that is taken into the air conditioning duct is discharged from the temperature control unit. By forming a differential temperature forming flow path that bypasses and linearly leads to the upstream position of the vent door
In addition, the side wall surface is formed along the flow direction of the temperature difference forming channel.
A sub-duct having a curved portion of a certain length formed on the upper wall surface of the sub-duct.
A fresh vent flow that branches from the differential temperature forming flow path and introduces the air taken in the air conditioning duct to a position downstream of the vent door above the air conditioning duct through a fresh vent opening provided for this purpose. And a branching position of the fresh vent channel in the sub-duct
The curved portion from the first position to the second position.
Rotate along and move from the second position to the third position
The first portion is provided so as to rotate beyond the curved portion.
At the position of the fresh vent channel and the differential temperature forming channel
Block both sides and move from the first position to the second position.
The fresh vent with the differential temperature forming channel closed
Open only the fresh vent channel through the opening,
The fresh from the second position to the third position
Single vent opening both vent and differential temperature forming channels
An air conditioner for a vehicle, comprising: a detour opening / closing door . 2. The air conditioner for a vehicle according to claim 1.
Te, air inlet upstream of the curved portion has an elongated rectangular shape in the vertical
An air conditioner for a vehicle, comprising: