JPS591604B2 - Automotive air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioner for maintaining the temperature inside a vehicle at a comfortable environmental temperature, that is, an air conditioner for automobiles, and in particular, to a heat exchange unit of an air mix type air conditioner. The present invention relates to the configuration of the cold/hot air mixing passage.

In the general ventilation line configuration of this type of air conditioner, a "blower" that selectively sucks in outside air or indoor air → "evaporator" as a cooling heat exchanger → "heater" as a heating heat exchanger → ``Cold/hot air mixing passage'' that mixes hot air and cold air after heat exchange → ``Air conditioning opening passage'' that selectively guides the air coming out of the passage in the previous section to multiple openings → Connected to each frontage in the previous section ``Distribution duct'' → ``Distribution duct'' that communicates with the air outlet of each part of the passenger compartment.
Each duct is made up of a series of parts.

Therefore, in order to obtain a comfortable ω environment temperature, it is necessary to provide individual ventilation with temperature and air volume that are suitable for each air outlet installed in each part of the passenger compartment. In order to satisfy this requirement using an exchanger, it is essential to adjust the air volume of cold and hot air and to effectively mix the air.

By the way, according to the structure of the heater passage and the cold/hot air mixing passage in the conventional automobile air conditioner, (a) the heating capacity of the heater cannot be used effectively; Temperature ventilation may not be carried out, and (b) adjusting the air volume of cold and hot air and driving the damper for mixing operation imposes an unnecessarily large operating load and tends to complicate the damper operating mechanism. (c) In the adjustment mixing operation described in the previous section, it is difficult to finely distribute the air, and it is difficult to control the temperature during the mixing operation. There are problems such as difficulty in adapting to heat blowing, and in other words, the current state of the art is that conventional air conditioners cannot appropriately respond to various modes when driving a car.

The present invention has been made in view of the above-mentioned current situation. That is, an object of the present invention is to provide a simple structure of the cold/hot air adjustment mixing passage, and to provide a B-LEVEL mode, FOOT
An object of the present invention is to provide an air conditioner for an automobile that can effectively correspond to driving modes such as mode and DEF mode.

The present invention will be described below based on an illustrated embodiment.

In the air conditioner of the embodiment, as shown in FIGS. 1 to 4, the ventilation system path has the following structure: an outside air intake passage 1, or an indoor air intake 2 → a blower 3 → a cooling passage 5 in which an evaporator lake 4 is installed. →Heating passage 7 with a heater core 6 inside →Cold/hot air mixing passage 8 consisting of a mixing box with a damper and baffle plate inside, which will be described later →DEF opening 9, FAC
After passing through the air conditioning opening passage 12 in which the E opening 10 and the FOOT opening 11 are opened, each opening 9, 10. → Consists of left and right rear seat upper duct B1, front seat left and right side ducts and front duct C FOOT opening 1 opening distribution duct 15 → front seat left and right footwell ducts L-D, and rear seat left and right footwell ducts 1 has been done.

Next, a pair of baffle plates 16 are erected on both end surfaces of the heater core 6, extending completely through the height direction and extending toward the downstream side.
Bypasses 7a for cold air are formed on both sides of the core 6, and a horizontal partition plate 17 is provided on the entire surface of the middle height between the cold/hot air mixing passage 8 and the air conditioning opening passage 12. , the upper half and the lower half of the both reverse passages 8° 12 are formed into an upper passage 18 as a first passage and a lower passage 19 as a second passage, so that the upstream end edge of the partition plate 17 is baffle plate 1
It overlaps and is orthogonal to the downstream end of 6.

In addition, a baffle plate 20 is erected in the air adjustment opening passage 12 below the upstream side of the FACE opening 10 so as to extend through the entire length in the height direction.
On the upstream side of the passage 12 space inside each of the openings 11,
A baffle plate 20 is facing.

By the way, the upper layer passage 18 and the lower layer passage 19 in the cold/hot air mixing passage 8 are provided with a damper operation rotation shaft 21 and a damper operation rotation shaft 21, respectively.
2 are suspended horizontally, and between the baffle plates 16 of each axis 21° 22, there are first and third dampers for hot air guiding in an upper passage 18 serving as a first passage and a lower passage serving as a second passage. Damper 23
, 24 are pivotally attached to the bypass 73 portion of each shaft 21, 22, and a pair of cold air guide dampers 25, 26, which are second and fourth dampers, are each pivotably attached to the bypass 73 portion of each shaft 21, 22. Dampers 23, 24c! J'> The rotation angles of the Fugetsu dampers 25 and 26 are different from each other by approximately 90°.

Each of the dampers 23 to 26 is formed of a butterfly blade with a balanced wing surface, and an operating lever 21a is provided at the externally projecting end of each shaft 21.22.

22a is pivoted.

In addition, in the closed position where each of the dampers 23 to 26 rotates in the vertical direction, the tips of the blades touch the partition plate 17 and the partition plate 11
No airflow leakage occurs between the

Next, damper operating rotational shafts 27, 28.29 are horizontally suspended along the downstream inner wall inside each opening 9, 10.11, and each rotational shaft 27.28.29 has a cantilever. Opening/closing dampers 30, 3L32 of the type are mounted on the shafts, and each shaft 27, 2
The operating levers 27a and 28 are provided at the externally protruding ends of 8.29.
a, 29a is pivoted.

Thus, each of these operating levers 21a, 22a.

27a to 29a are driven manually or automatically or semi-automatically using a temperature sensing member through a suitable conventional mechanism such as a wire transmission mechanism, a power transmission mechanism using a negative pressure actuator, or a power transmission mechanism using an electric servo. For example, in the operation panel shown in Figure 5, there are three
Each knob 36 of the stage operation stroke 33, 34, 35,
37 and 38, the damper is set, and specifically, the opening 9 is set in response to the movement of the upper knob 36.
．． 10.11 opening/closing operation levers 27a, 28a.

29a is driven, and corresponding to the movement of the middle knob 37 and the lower knob 38, the operating lever 21a of the upper passage 18 wind guide damper and the operating lever 22a of the lower passage 19 wind guide damper are driven by 1, respectively. .

Next, the operation of the air conditioner of the embodiment configured as described above will be explained.

The air selectively sucked in by the blower 3 from the outside air suction passage 1 or the indoor air suction port 2 and discharged from the blower 3 is
If necessary, the air is once cooled by the evaporative lake 4 and then sent to the heating passage 7.

The air passing through the heating passage 7 is divided into warm air passing through the heater core 6 and cold air passing through the bypass 7a. 25 and 26, the air is then divided into two directions, the upper passage 18 and the lower passage 19, and is mixed while passing through the passages 18 and 19, thereby adjusting the temperature to a medium temperature corresponding to the air volume. After being aerated and sent to the upper and lower halves of the open passage 12, it is selectively discharged into the duct through the openings 9, 10, 11.

During the mixing operation, the baffle plate 20 prevents cold air that has not been sufficiently mixed from directly entering the passage 12 in the FOOT opening 11.

Next, FACE mode, FOOT mode, BI-LEV
The air conditioning operation when set to the four modes of EL mode and DEF mode will be explained with reference to Fig. 6. Among the symbols, arrows on a white background indicate cold air, and arrows on a mottled black background and arrows on knitted fabrics indicate cold air. indicate warm air and moderate temperature air, respectively.

Note that the mode (FACE, B1-FOOT) may change in steps by operating the operation knob 36.
This device continuously changes modes (airflow distribution) in conjunction with changes in the position of the knob 36.

(a) FACE mode...Figure a damper 2
3 and 24 are fully closed and the dampers 25 and 26 are fully open, only cold air flows. However, since the damper 32 is fully closed, the lower passage 19 has internal pressure, and therefore the entire amount of cold air flows. is discharged from the FACE opening 10 and blown into the upper part of the vehicle compartment.

(b) FOOT mode... By operating in the opposite manner to the previous section shown in the figure, the entire amount of hot air is transferred to the FOOT opening 1.
1 and blows out onto the floor of the passenger compartment.

(c) B I-LEVEL mode...
・Figure 0 mode is mainly used in the middle season.

The upper passageway 18 blows a gentle cool breeze, and the lower passageway 19
At the same time, warm air is blown into the interior of the car, achieving comfortable temperature control that keeps your head cool and your feet warm.

That is, damper 31 (for upper air volume) and damper 32
(for lower layer air volume), and the upper layer blowing temperature can be adjusted by operating the knob 37 of the operating stroke 34 for the dampers 23 and 2.
5, and the lower layer blowing temperature is the operating stroke 35.
By operating the knob 38, the dampers 24 and 26 can be operated to obtain the desired temperature.

(d) DEF mode: Only warm air flows as in section d(b) of the figure, but since the damper 32 is half open, most of the warm air is discharged from the DEF opening 9. At the same time, the remaining part of the warm air is discharged from the FOOT opening 11,
This effectively prevents fogging while maintaining footwell heating.

In the air conditioner of the example, such an operation is performed, but
In conventional air conditioners, the air mix damper was placed upstream of the heater core, so a horizontal partition plate was installed all over the inside of the heater case, and the heater capacity was therefore divided into the upper and lower layers. Therefore, depending on the mode, half of the capacity is not used, and in order to use the full capacity, it is necessary to install a bypass damper in the middle of the partition plate, which avoids complicating the structure and reducing heating performance. I couldn't.

Furthermore, in conventional air conditioners, each damper for wind guidance was attached to its own operating rotation shaft, which made the operating drive mechanism extremely complicated. Since it was a type damper, the load on its drive was large,
This has made it difficult to miniaturize the device.

By the way, in the configuration of the embodiment described above, the dampers 23 and 25 in the upper passage 18 and the dampers 24 and 26 in the lower passage 19
Preferably, as shown in FIGS. 7 and 8, the shapes and dimensions of the dampers 24 and 26 of the lower passage 40 (FIG. 8) are the same as in the structure of the above-described embodiment. In the same manner as in the case, and for the damper of the upper passage 41 (FIG. 7), by narrowing the width between the baffle plates 42 projecting to the downstream side of the heater core 6, the cold air relative to the passage area of the hot air guide damper 43 is reduced. The area ratio of the passage area of the wind guide damper 44 is set larger than the area ratio of the damper 24°26 of the lower passage 40, thereby making the amount of cold air in the upper passage 41 linear, thereby further ensuring the effect of cooling the head and heating the feet. I can do it.

Furthermore, in such an embodiment, the control characteristic of the upper layer blowing air temperature (the characteristic line in FIG. 9) and the control characteristic of the lower layer blowing air temperature (the characteristic line in FIG. 10) exhibit mutually complementary curvature. Therefore, if the operation stroke knobs 37 and 38 (Fig. 5) of both layers are combined into one, there is an advantage that the temperature of the blown air can be finely adjusted by flattening while maintaining a cold head and feet warm condition.

As described above, according to the automotive air conditioner according to the present invention, the hot air and cold air guide dampers are arranged on the outlet side of the heater core, and the dampers are formed with butterfly blades, and the dampers are arranged on a common axis. the upper and lower 2
In addition to separating the layers, it also prevents air leakage between the partition plate and the damper.Furthermore, the area of the cold air passage introduced into the upper passage is larger than that of the lower passage, so that cold and hot air can be separated. In addition to simplifying the structure of the regulating/mixing passage, the heating capacity of the heater can be used effectively, and furthermore, effective and smooth air conditioning operation is possible in accordance with each mode of operation. This has the effect of improving the operability of the device and making it possible to downsize the device.

[Brief explanation of drawings]

FIG. 1 is a perspective view of essential parts of an automobile air conditioner showing an embodiment of the present invention, and FIG. 2 is a front view of the same as seen from the lower left of FIG. 1, showing the front outer panel of the device. FIG. 3 is a plan view of the right half of FIG. 2, showing the inside with the top outer panel of the device removed. FIG. 4 is a plan view of the right half of FIG. and a perspective view of the downstream area of the heater core in Figure 3, and Figure 5.
FIG. 6 is a front view of the operation panel in the embodiment device, and is a cross-sectional operation view of the right half of FIG.
7 is a plan view of the upper layer passage showing another embodiment, and corresponds to FIG. 3. FIG. 8 is a plan view of the lower layer passage, and FIG. 9 and 10 are graphs of the operating characteristics of the passage of FIG. 7 and the passage of FIG. 8, respectively. 6...Heat core, 7a...Bypass, 8...Cold/hot air mixing passage, 17...Partition plate, 18.41...Upper layer Passage, 19.40・
...lower passage, 21゜22 ...operation rotation axis, 23,24.43 ... hot air guide damper,
25, 26. 44...Cold air guide damper.

Claims (1)

[Claims] 1. Hot air passing through a heater core serving as a ventilation air heating exchanger and cold air passing through a bypass passage of the heater core are mixed with each other in a mixing box downstream of the heater core to obtain the required blowout air temperature. In the automotive air conditioner, first and second passages are partitioned by a partition plate in the mixing box to communicate with the heater core and the bypass passage, respectively, and communication between the first passage and the heater core. a first damper that controls communication between the first passage and the bypass passage; a second damper that controls communication between the first passage and the bypass passage;
a third damper that controls communication between the passage and the heater core;
and a fourth damper that controls communication between the second passage and the bypass passage, the portion of the first passage between the first damper and the heater core and the second
An air conditioner for an automobile, wherein a portion of the passageway between the third damper and the heater core communicates with each other.