JPS6317109A - Air-conditioning device for automobile - Google Patents

Abstract

PURPOSE:To make it possible to regulate the temperature of upper blow-out air during bi-level mode, by adjusting the position of a damper means during bi-level mode to change the flow rate of cool air which is fed into an upper air take-out port through a bypass passage. CONSTITUTION:During bi-level mode, a damper 16 in an upper air take-out port 15 is located at the position N while a damper 18 in a defroster air blow- out port 17 is located at the position F, and a damper 20 in a lower blow-out port 19 is located at the position P. At this time, when a temperature regulating know is moved to a predetermined position, an air mix damper 13 is moved from the position V1 to the position 2 while an air mix subdamper 21 is moved from the position W3 to the position W4, and a damper 23 is moved from the position X1 to the position X2. Then, the ratio of the flow rate of cool air passing through a second bypass passage 22, to the flow rate of air from an air mix chamber 14 is gradually decreased. As a result, the temperature of air flowing into the upper air take-out port 15 is gradually raised.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to an air conditioner for an automobile that has an improved bilevel mode in which air is blown simultaneously from upper and lower air outlets.

(Prior art) Conventionally, automotive air conditioners have a configuration that allows a bilevel mode to be set in which air is blown simultaneously from upper and lower outlets during seasons when intermediate temperatures are required, such as in spring and autumn. It has been widely adopted recently. In the bilevel mode, in order to improve the feeling of air conditioning, the temperature of the air blown downward (at the feet) is made higher than that of the air blown upward, so that a temperature distribution of the blown air with cold head and warm feet is obtained.

As prior art related to the present invention, Utility Model Publication No. 53 = 2
No. 5329, Jikko No. 54-9708 and Jikko No. 54-
There is number 9713. Utility Model Publication No. 54-9708 discloses a technique for simultaneously blowing cold air upward in the direction C and hot air downward from the same outlet, and adjusting the blowout m of the cold air. Utility Model Publication No. 53-25329@ discloses an air conditioner for automobiles equipped with an air mixing chamber that mixes warm air that has passed through a heating heat exchanger and cold air that has bypassed the heating heat exchanger. . Also, Utsuko 54-9713
The issue is equipped with an air mix sub-damper in the bypass path that bypasses the heating heat exchanger and directs the cold air, and by adjusting the angle of the air mix sub-damper, the cold air is applied to the warm air. The present invention discloses an air conditioner for an automobile that is configured to ensure mixing of hot air and to fully open a bypass path when only cold air is ventilated to reduce ventilation resistance.

(Problems to be Solved by the Invention) However, requirements regarding the temperature difference between the air blown out from the upper and lower air outlets vary depending on individual differences among occupants or the driving environment of the automobile. In particular, occupants are sensitive to the air blown out from the upper outlet, and may feel uncomfortable if the temperature of the air from the upper outlet is too low or too high.

SUMMARY OF THE INVENTION In view of the above-mentioned points, an object of the present invention is to provide an air conditioner for an automobile that can adjust the temperature of the upwardly blown air during bilevel mode.

(Means for Solving the Problems) In order to achieve the above object, the present invention has the following features: (a) An air intake port is provided on one end side, and an upper air outlet communicating with an upper air outlet and an occupant footwell on the other end side. (b) an air blower provided within the air flow path; (c)
(c) a heating heat exchanger provided in the air flow path to heat the air blown by the blower; and (c) a heating heat exchanger provided in the air flow path to pass the heating heat exchanger as a bus pass. (e) an air mix that is provided in the air flow path and adjusts the ratio of air volume between warm air heated by the heating heat exchanger and cold air passing through the first bypass path; (f) an air mixing chamber provided in the air flow path and mixing the cold air sent through the first bypass path and the warm air that has passed through the heating heat exchanger; , (b) a second bypass path provided in the air flow path, which bypasses the heating heat exchanger and causes cold air to flow substantially directly into the upwardly blown air outlet; (c) the above. A technical feature of the invention is that the damper means is provided in the air flow path and controls the flow rate of the cold air passing through the second bypass path in the bilevel mode; and (i) the damper operation means operates the damper means. Adopt means.

According to the above technical means, by moving the position of the damper means at the pie level, the flow rate of the cold air sent substantially directly to the upper air outlet through the second bypass path changes. In other words, in bi-level mode, the first
The cold air from the bypass path is mixed with the warm air that has passed through the heating heat exchanger in the air mixing chamber, and the temperature is raised somewhat.
The cool air, whose temperature has been moderated, passes through the upper air outlet and is blown out from the upper outlet, while the warm air that has passed through the heating heat exchanger is sent to the lower outlet at almost the same temperature. By creating a temperature difference between the upper and lower blown air, it is possible to obtain a blown-out temperature distribution with cold heads and hot feet. By adjusting the position of the damper means during this bi-level mode, the upper blowing air through the second bypass path is controlled to be different from the cold air flowing from the first bypass path through the air mixing chamber to the upper blowing air outlet. The proportion of cold air flowing almost directly into the outlet changes, thereby making it possible to adjust the temperature of the air blown out from the upper outlet. In this case, the temperature of the entire blown air can be arbitrarily set by the opening degree of the air mix damper.

(Example) The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 1 shows a first embodiment, in which reference numeral 1 denotes an inside/outside air switching box, which incorporates an inside/outside air switching damper 2. This damper 2 switches between an inside air intake port 3 and an outside air intake port 4. It is designed to open and close. 5 is a blower, inside/outside air switching box 1
It has a feeder casing 6 that is integrally assembled to the lower part of the fan, a motor 7a, and a sirocco fan 7b that is driven by the motor 7a. 8 is a case of a cooler unit, which has a built-in heat exchanger 9 for cooling. This heat exchanger 9 consists of a refrigerant evaporator of a refrigeration cycle with a compressor driven by an automobile engine. 10 is a case of a heater unit, which has a heating exchanger 11 built therein. This heat exchanger 11 consists of a heater core (hot water radiator) whose heat source is the cooling water of an automobile engine. A first bypass passage 12 is formed adjacent to this heating heat exchanger 11, and furthermore, a first bypass passage 12 is formed adjacent to this heating heat exchanger 11.
An air mix damper 13 is provided to adjust the proportion of cold air passing through the heat exchanger 2 and hot air passing through the heat exchanger 11. By adjusting the opening degree of this damper 13, the temperature of the air blown into the vehicle interior can be adjusted as desired. It can be adjusted to 1
4 is an air mixing chamber that mixes cold air and hot air. Reference numeral 15 designates an upper air outlet, which is connected to an upper air outlet (vent outlet) that blows air toward the upper body of the passenger H through a three-way branch duct (not shown). These upper air outlets are normally provided at three locations, one in the center of the upper part of the instrument panel of an automobile, and one on both left and right sides. 16 is a damper that opens and closes the upper air outlet 15. 17 is a defroster blowout air outlet, which is a defroster (not shown).

It is connected through a duct to a defroster outlet that blows air toward the front windshield of the car. Several defroster outlets are usually provided on the top surface of the instrument panel and adjacent to the window glass. A damper 18 opens and closes the defroster air outlet 17. 1
9 is a downward air outlet that blows air toward the feet of the occupants;
It is provided at the lower part of the heater unit case 10 so as to open toward the driver's seat side and the passenger seat side. This lower air outlet 19 is opened and closed by a damper 20.

Reference numeral 21 denotes an air mix sub-damper, which moves in conjunction with the air mix damper 13 to guide the flow direction of the cold air toward the air mixing chamber 14 through the first bypass path 12.

A second bypass passage 22 bypasses the heating heat exchanger 12, is located above the first bypass passage 12, and guides cold air substantially directly to the upper air outlet 15. .

A damper 23 adjusts the flow rate of the cold air passing through the second bypass path 22, and is interlocked with the air mix damper 13 and the air mix damper 21. Note that 100 has an internal and external air intake port 3.4 on one end side, and an air outlet section 15.17 on the other end side.
．． The entire air flow path with 19 is shown.

FIG. 2 shows an air conditioning control panel 30 installed in or around the instrument panel of an automobile, where 31 is an inside/outside air switching knob, and the inside/outside air switching damper 2 is located at the outside air intake position shown by the solid line in FIG. 1. (FRESH) and the internal air intake position (RECIRC) shown by the broken line in FIG. 3
Reference numeral 2 denotes a temperature adjustment knob, which allows the position of the air mix damper 13 to be adjusted between the maximum cooling position (GOOL) shown by the dashed line in FIG. 1 and the maximum heating position shown by the broken line J in FIG. It continuously adjusts between positions (WARM). Further, the temperature adjustment knob 32 is connected to the damper 23 via a hollow link groove (not shown) or the like, and controls the positions of the dampers 21 and 23. 3
3 is a blowout mode setting knob, which sets the following five blowout modes by controlling the opening and closing of the various dampers 16, 18, 20 shown in FIG. 1 via a link mechanism (not shown), etc. be. That is, by moving the knob 33 to any of mode switching positions ■, ■, ■, ■, and ■, (1) vent (VENT) mode, (a
) pie level (B/L) mode, (3) heat (HEA)
T) Mode, (4) Defroster Heat (DEF-HE
(AT) mode and (5) defroster (DEF) mode. Reference numeral 34 denotes a blower control knob, which controls the energizing circuit to the fan drive motor 7a to turn the blower off (OFF), low speed (LO), and medium speed (
Me) and 8th speed (Hi). 35
The compressor operation switch is generally referred to as an air conditioner switch, and is used to turn on and off the power supply to the electromagnetic clutch for the compressor of the refrigeration cycle, thereby turning on and off the operation of the compressor. Therefore,
When this switch 35 is turned on to operate the compressor, a cooling effect by the cooling heat exchanger 9 is obtained.

Next, the operation of this embodiment will be explained. First, the relationship between the blowout mode setting knob 33 and the dampers 16, 18, and 20 will be described. Regarding this, please refer to FIG. 3, which shows a relationship position setting table between the knob and the dampers.

When the knob 33 in FIG. 2 is operated to the position ■ in the vent (VENT) mode, the damper 16 is moved to the position C shown by the dashed dot line in FIG.
, the upper air outlet 15 is opened. In conjunction with this, dampers 18 and 20 are respectively set to F in Fig. 1.
, the defroster air outlet 17 is operated to the G position.
and close the lower air outlet 19. Therefore, the blown air from the air blower 115 flows into the cooler unit case 10,
Depending on the position of the air mix damper 13, a portion passes through the heating heat exchanger 11 and becomes warm air and is sent to the air mixing chamber 14, and the remainder passes through the first bypass path 12 and becomes cold air. The air is sent to the air mixing chamber 14. The hot air and cold air sent to the air mixing chamber 14 are mixed with each other to become air with an appropriate temperature determined by the opening degree of the air mix damper 13, and flow to the upper air outlet 15, and are discharged from the upper air outlet (not shown) into the vehicle interior. Air is blown toward the upper body of the passenger, providing cooling or ventilation.

Next, the heat (HFA) knob 33 was moved to the position ■.
In the T) mode, the damper 16 is operated to position D in FIG. 1 to close the upper air outlet 15, and the damper 18 is operated to position M in FIG. 1 to close the defroster air outlet 17. Leave a little space between. The damper 20 is then operated to the position H in FIG. 1 to open the lower air outlet 19. Therefore, the cold air that has passed through the first bypass path 12 and the warm air that has passed through the heating heat exchanger 11 are mixed in the air mixing chamber 14 to reach an appropriate temperature, and this air at the appropriate temperature is released from the lower air outlet 19. The air is blown out to the feet of passengers, providing a heating effect. Further, hot air is blown out from the defroster outlet via the defroster outlet 17.

Next, in the defroster heat (DEF-HFAT) mode in which the knob 33 is moved to the position ■, the damper 1
6 is operated to position D in FIG. 1 to close the upper air outlet 15. The damper 18 is operated to the position E in FIG. 1 to open the defroster air outlet 17, and the damper 20 is operated to the position H in FIG. 1 to open the lower outlet 19. Therefore, similarly to the heat mode, warm air at an appropriate temperature is blown out from the lower air outlet 19 to the feet of the occupant, and is also blown out from the defroster air outlet via the defroster air outlet 17.

Next, move the knob 33 to the position of the defroster (D
In the EF) mode, the damper 16 and the damper 20 are operated to the position G in FIG. 1, respectively, to close the upper air outlet 15 and the lower air outlet 19. Then, the damper 18 is operated to the position E in FIG. 1 to open the defroster air outlet 17, so that the air mixed in the air mixing chamber 14 and at an appropriate temperature is delivered to the window glass from the defroster outlet (not shown). It is blown towards the window and has the effect of defogging the window glass.

Next, move the knob 33 to the position ■ and move the pie level (8
7L) Describe the mode. In pie level (B/L) mode, the damper 16 is operated to the N position in FIG.
Further, since the damper 20 is operated to the position P and the damper 18 is operated to the position F in FIG. 1, both the upper air outlet 15 and the lower air outlet 19 are opened at the same time. Air flows through 19, and wind blows out from the upper and lower air outlets at the same time. That is, a part of the warm air that has passed through the heating heat exchanger 11 is transferred to the air mixing chamber 1 as shown by arrow R.
4, and most of the remaining warm air flows toward the lower outlet 19 as shown by the arrow S, and the remaining warm air flows toward the lower outlet 19.
9, it is blown out at the feet of the passengers. On the other hand, the cold air flowing into the air mixing chamber 14 as shown by the arrow T through the first bypass path 12 is mixed with a part of the warm air shown by the arrow R, and its temperature is increased to some extent. The cold air whose temperature has been increased flows toward the upper outlet 15 as shown by the arrow U, and is blown out from the upper outlet to the upper body of the occupant, thus providing a comfortable temperature distribution with a cold head and warm feet shape for use in spring and autumn, etc. . The upper air outlet 15 is provided at a position where it can easily take in the cold air that has passed through the first bypass path 12, and the lower air outlet 19 is located at a position where it can easily take in the Am that has passed through the heating heat exchanger 11. It is set in.

Next, when the temperature adjustment knob 32 is operated, the damper 13.2
The operations of Nos. 1 and 23 will be explained. Regarding this as well,
Please refer to the relationship position setting table between the knob and the damper shown in FIG.

Set the temperature adjustment knob 32 shown in FIG. 2 to the maximum cooling position <G.
OOL), the air mix damper 13 is operated to the position K shown by the dashed line in FIG.
1 and 23 are operated to the positions Wl and ×1 in FIG. 1, respectively, so that the cold air formed after passing through the cooling heat exchanger 9 bypasses the heating heat exchanger 11 and flows ,
That is, the cold air flows into the first bypass path 12, flows along the arrow T, and reaches the air mixing chamber 14. Further, a portion of the cold air from the cooling heat exchanger 9 flows into the second bypass path 22 as shown by arrow Y, and almost directly reaches the upward air outlet 15. Thus, the lowest outlet temperature is obtained when the knob 32 is in the maximum cooling position (COOL). The air mix sub-damper 21 operated to the Wl position does not substantially exert any resistance on the airflow flowing through the first bypass path 12.

When the knob 32 is moved from the maximum cooling position (COOL) to the position (■), the air mix damper 13 is operated to the position V1 shown by the two-dot chain line in FIG. Although the damper 23 is operated to the position IW3 indicated by the chain line, the damper 23 is hardly operated and remains at position x1.

Therefore, a part of the cold air from the cooling heat exchanger 9 passes through the heating heat exchanger 11, becomes warm air, and is mixed with air as shown by arrow R! 14. The remaining cold air passes through the first bypass path 12, flows as shown by arrow T, and reaches the air mixing chamber 14, and a portion flows into the second bypass path 23, as shown by arrow Y. The air flows almost directly to the upper air outlet 15. The cold air that reaches the air mixing chamber 14 along the arrow T is mixed with the warm air indicated by the arrow R in the air mixing chamber 14. The air mix sub-damper 21 operated in the W3 position guides the cold air flowing through the first bypass path 12 toward the air mixing chamber 14, thereby improving the mixing efficiency of hot air and cold air in the air mixing chamber 14. It acts to increase the

When the knob 32 is moved from the position ■ to the position ■ in Figure 2, the air mix damper 13 moves from Vl to ■2 in Figure 1, and the air mix sub-damper 21 moves from W3 to W4 with a very slight change. It just moves the angle. In contrast, the damper 23 moves from x1 to x2. Therefore, a portion of the cold air from the cooling heat exchanger 9 is transferred to the heating heat exchanger 11.
The hot air flows into the air mixing chamber 14 as shown by arrow R. The remaining cold air flows through the first bypass path 1.
2 and flows as shown by arrow T to the air mixing chamber 1.
4, where it is mixed with the warm air indicated by arrow R. The air mix sub-damper 21 operated in the W4 position guides the cold air flowing through the first bypass path 12 toward the air mixing chamber 14, and mixes hot air and cold air in the air mixing chamber 14. It acts to increase mixing efficiency. When the knob 32 is moved from the position ■ in FIG. 2 to the maximum heating position (WARM), the air mix damper 13 changes from V2 to J in FIG.
The air mix sub-damper 21 is operated from W4 to W2, but the damper 13 remains at approximately the x2 position.

Therefore, the entire amount of cold air that has passed through the cooling heat exchanger 9 passes through the heating heat exchanger 11 and becomes 1 ffl. Then, this fu Jet almost directly reaches the lower air outlet 19 as shown by the arrow S. Thus, when the knob 32 occupies the maximum heating position (WARM), the highest temperature blown air is obtained.

As the air mix damper 13 is moved from V2 to J, the flow rate of cold air flowing into the first bypass path 12 gradually decreases, but the air mix damper 21
is operated from W4 to W2 to gradually narrow down the flow area of the first bypass passage 12 to ensure the flow velocity of the cold air flowing through the first bypass passage 12, so that the cold air flows along the arrow R. This increases the efficiency of mixing with the warm air flowing in the mixing chamber 14.

Next, temperature control of the air blown from the upper air outlet in the bilevel mode, which is a feature of the present invention, will be explained with reference to FIGS. 1 to 5. As mentioned above, in the bilevel mode, the damper 16 of the upper air outlet 15 is in the N position, and the damper 1 of the defroster air outlet 17 is in the N position.
8 is in the F position, and the damper 20 of the lower air outlet 19 is in the P position.
occupies the position of When the temperature adjustment knob 32 shown in FIG. 2 is moved to the position ■ in this bi-level mode,
The air mix damper 13 occupies the position indicated by V1 in FIG. 1, the air mix sub-damper 21 is operated to W3, and the damper 23 is operated to x1 (see FIG. 4).

At this time, part of the cold air that has passed through the cooling heat exchanger 9 is warmed up.
The warm air passes through the heat exchanger 11 and becomes warm air, and a portion of the warm air flows directly into the lower air outlet 19 as shown by arrow S and is blown out to the feet of the occupant. The remainder of the hot air flows into the air mixing chamber 14 as indicated by arrow R. On the other hand, the cold air from the cooling heat exchanger 9 flows through the first and second bypass paths 12 and 2.
The cold air flowing into the first bypass passage 12 is guided by the air mix sub-damper 21, flows as shown by arrow T, and flows into the air mixing chamber 14, where it flows as shown by arrow R. The heated air is mixed with the heated air to increase the temperature to some extent, and flows toward the upward air outlet 15 as shown by arrow U. As shown by arrow Y, the second bypass path 22
The cold air flowing into the upper air outlet 1
5, the air flows into the upper air outlet 15 together with the cold air whose temperature has been increased somewhat as indicated by the arrow U, and is blown out from the upper air outlet toward the upper body of the occupant. At this time, the temperature difference between the warm air blown from the lower air outlet 19 and the cold air blown from the upper air outlet is maximum.

When the temperature adjustment knob 32 in FIG. 2 is moved from ■ to the position ■, the air mix damper 13 moves from Vl to V2, the air mix sub-damper 21 moves from W3 to W4, The damper 23 moves from x1 to x2.

As the damper 23 moves from x1 to x2, the number of cold air outlets flowing into the second bypass path 22 gradually decreases. In other words, the ratio of the flow rate of the cold air passing through the second bypass path 22 indicated by the arrow Y to the flow rate of the air flow indicated by the arrow U from the air mixing chamber 14 gradually decreases, and therefore the upward blowing air intake The temperature of the air flowing into the outlet 15 gradually decreases. Then, when the knob 32 moves to the position ■, the damper 23 occupies the ×2 position and the flow flows through the second bypass path 22 (see FIG. 5), thus bypassing the heating heat exchanger 11. The entire amount of cold air flows into the air mixing chamber 14 through the first bypass passage 12 and mixes with the warm air indicated by arrow R, and the temperature is increased to some extent. The air flows as shown by arrow U and flows into the upper air outlet 15, thus minimizing the temperature difference between the cold air blown out from the upper air outlet and the warm air blown out from the lower air outlet 19.

As described above, by moving the damper 23 in the bilevel mode and controlling the flow rate of cold air flowing almost directly into the upper air outlet 15 through the second bypass path 22, The temperature of the air blown toward the occupant's upper body can be changed according to the occupant's preference.

Even in the above bilevel mode, by moving the air mix damper 15 between Vl and K and between v2 and J, the temperature of the entire blown air can of course be set arbitrarily. be.

FIG. 6 shows the air conditioning control panel 130 in the second embodiment. Although it has been explained that the damper 23 that moves is linked to the temperature adjustment knob 32, in this second embodiment, the damper 3 moves with the mode switching knob 33, and the knob moves between the ■ position and the ■ position. When the damper 23 moves between x1 and x in FIG.
It is designed to be operated between 2 and 2. This second embodiment also provides substantially the same effects as the first embodiment.

FIG. 7 shows a third embodiment, in which the pivot shaft 201 of the damper 23 and the pivot shaft 202 of the air mix sub-damper 21 are separate and separated from each other by a small distance. This embodiment differs from the first embodiment described above and is identical in other respects. This third embodiment also provides substantially the same effects as the first embodiment.

FIG. 8 shows a fourth embodiment, in which the air mix sub-damper 2 used in the first embodiment is
1 is replaced by a fixed guide wall 301. This fourth
Although this embodiment is inferior to the first embodiment in that the fixed guide wall 301 exerts some resistance to the airflow flowing through the air mix damper 13, the airflow from the upper outlet in the bilevel mode is They have the same effect of being able to change the air temperature.

In each of the above embodiments, the case where the cooler unit case 8 containing the cooling heat exchangers 9 is provided upstream of the heater unit case 10 has been described. It goes without saying that the present invention can also be implemented in an automobile air conditioner that is provided with a simple connecting duct instead.

Furthermore, in each of the above-described embodiments, the flow of warm air from the heating heat exchanger 11 is divided into two flows R and S, so-called two flows.
Although the illustration has been described assuming that a stratified air mix method is adopted, the same effect can be obtained by adding a damper on the downstream side of the heating heat exchanger 11 to create a three-layer air flow.

In each of the above embodiments, the damper 23 is the blowout mode setting knob 33.
Although described as being operated in conjunction with or in conjunction with the temperature adjustment knob 32, the damper 23 may be operated independently of the knobs 33, 32. Further, the shape of the damper 23 is not limited to the one shown in the drawings, and may have any shape as long as it can adjust the amount of air flowing into the second bypass path.

(Effects of the Invention) As detailed above, according to the present invention, in the bilevel mode in which a temperature difference is given to the upper and lower blown air to obtain a temperature distribution of cold head and feet, the temperature of the upper blown air can be set to an arbitrary temperature. This allows the occupants to choose from a wider range of air-conditioning sensations depending on their preferences, making it possible to achieve even more comfortable air-conditioning performance.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an air flow path showing a first embodiment of the present invention;
FIG. 2 is a front view of the air conditioning control panel in the first embodiment shown in FIG. 1, and FIG. 3 is the relative position between the knob and damper in the first embodiment shown in FIG. An explanatory diagram showing a setting table, and FIG. 4 is an air flow path cross section for explaining the air flow when the second bypass path is fully opened by the damper in the first embodiment shown in FIG. Figure 5 is a diagram similar to Figure 4, but Figure 6 shows a state in which the second bypass path is fully closed.
The front view of the air conditioning control panel in this embodiment, and FIGS. 7 and 8 are cross-sectional views of air flow paths showing the third and fourth embodiments of the present invention, respectively. 2.3...Air suction path, 5...Blower, 11...Heating heat exchanger, 12...
1st bypass path, 13... air mix damper, 14... air mixing chamber, 15... upward blowing air outlet, 19... downward blowing exit, 22
...Second bypass path, 2a...Damper means, 30...Air conditioning control panel, 32...
...Temperature adjustment knob, 33...Blowout mode setting knob, 100...Air flow path.

Claims (1)

[Scope of Claims] (a) An air flow path having an air inlet at one end and at least an upper air outlet communicating with the upper air outlet and a lower air outlet opening at the feet of the occupant at the other end; , (b) a blower provided within the air flow path; and (c)
(d) a heating heat exchanger provided in the air flow path to heat the air blown by the blower; (d) a heating heat exchanger provided in the air flow path to bypass the heating heat exchanger and pass cold air; a first bypass path; (e) an air mitt provided in the air flow path to adjust the air volume ratio between warm air heated by the heating heat exchanger and cold air passing through the first bypass path; (f) an air mixing chamber that is provided in the air flow path and mixes the cold air sent through the first bypass path and the warm air that has passed through the heating heat exchanger; (g) a second bypass path provided in the air flow path, which bypasses the heating heat exchanger and allows cold air to flow substantially directly into the upper air outlet; (h) A damper means provided in the air flow path that controls the flow rate of cold air passing through the second bypass path during bilevel mode; and (i) a damper operating means that operates the damper means. Air conditioner.