JPH07450B2 - Automotive air conditioner - Google Patents

Description

TECHNICAL FIELD The present invention relates to improvement of temperature controllability of an air conditioner for a vehicle.

[Conventional technology]

Conventionally, in the air mix type air conditioner for automobiles,
A defroster outlet is provided at the top of the case, an upper outlet at the center is provided on the lower side of the case and on the front side of the case, and upper outlets at the sides are provided on both sides, and it communicates with the hot air passage above the heater core. There is known a structure in which a lower outlet is provided at a portion to be opened.

[Problems to be solved by the invention]

However, according to the present inventors' experimental research, it was found that the above-mentioned configuration causes the following problems in practical use. That is, in the above conventional configuration, since the defroster outlet and the upper outlets in the center and both sides are close to each other, the temperature difference between the outlets in the FULL OPEN mode in which all the outlets are open. As shown in FIG.
Since the temperature is almost the same, and the temperature difference between the lower outlet and the defroster outlet is large, a sufficient defroster effect and side demist effect cannot be obtained unless the air mix damper is operated near the maximum heating. The temperature control characteristics are difficult to use.

Therefore, in view of the above points, the present invention intends to improve the blown air temperature characteristics such that a comfortable temperature distribution of the head cold foot heat type is obtained and a sufficient defroster effect and side demist effect are exhibited.

[Means for solving problems]

Therefore, the present invention provides, in an automobile air conditioner, a heater core that heats blown air, an air mix damper that adjusts an air flow rate ratio between warm air that flows into the heater core and is heated and cold air that does not pass through the heater core, and A cold air passage through which cool air does not pass through the heater core, a warm air passage through which warm air heated by the heater core flows, and a mixture of cold air from the cold air passage and warm air from the warm air passage is introduced. The defroster outlet for blowing out the wind on the windshield of the car, the upper outlet in the center for blowing out the wind toward the upper body of the occupant, and the both sides of the car where the wind can be blown on the side glass. The upper air outlet and the lower air outlet for blowing the air to the feet of the occupant, and the air guide allows warm air to flow from the warm air passage. A pass passage is formed in the case, and a discharge port that guides warm air to the defstar blower outlet and a discharge port that guides warm air to the upper blower outlets on both sides at the outlet of the warm air bypass passage, The technical means of dividing these two discharge ports and providing a guide for guiding the discharge direction of the hot air is adopted.

[Work]

With the above configuration, some of the warm air from the warm air passage does not mix with the cold air and flows into the defroster outlet and the upper outlets on both sides as it is, so that the air mix damper is at the intermediate position. Also, the defroster blown air temperature and the upper blown air temperature on both sides can be increased.

〔The invention's effect〕

Therefore, according to the present invention, practically sufficient defroster effect and side demist effect can be obtained without operating the air mix damper to the maximum heating position.

In addition, since the amount of hot air introduced to the defroster outlet and the upper outlets on both sides can be set freely according to the guide shape of the air guide, the size of the outlet, etc., the temperature difference between the outlets can be set freely. . Therefore, the outlet air temperature can be set in the order of lower outlet> defroster outlet> upper outlets on both sides> upper outlet in the center, so that a comfortable outlet temperature distribution of head cold foot heat can be obtained. .

Moreover, according to the present invention, since the above-described effects can be achieved by installing a simple air guide in the case, there is a practical advantage that the air conditioner can be manufactured with a small and simple structure at low cost.

〔Example〕

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

FIG. 1 shows a state in which the apparatus of the present invention is mounted on an automobile. 1 is a front glass of the automobile, 2 is a hood, 3 is an engine room, 4 is a vehicle compartment, 5 is a vehicle compartment 4 and an engine room 3. It is a cowl portion formed in a space surrounded by the bonnet 2. In this embodiment, a blower unit 6 of the air conditioner is installed in the cowl portion 5, and the unit 6 has a blower fan 7 driven by a motor (not shown). 7
An inside / outside air switching box (not shown) is provided on the suction side of. The air conditioning main unit 8 into which air is introduced from the blower unit 6 is installed in the vehicle compartment 4, and the cooler core 10 is installed at the most upstream side of the air passage formed in the case 9 of the unit 8. . This cooler core 10
It consists of a refrigerant evaporator of a refrigeration cycle that operates using an automobile engine as a drive source. Cooler core at the bottom of Case 9
An outlet 11 for drain water generated by 10 is formed. A heater core 12 that uses the cooling water (warm water) of the automobile engine as a heat source is installed in the approximate center of the case, and the air inlet side 12a of the heater core 12 is rotatable around a shaft 13. Air mix damper 14 for temperature control
Is provided. Also, the air inlet side of the heater core 12
A cold air passage 15 is formed between 12a and a case surface 9a opposed to the air passage 12a at a predetermined interval, and the amount of cold air passing through the cold air passage 15 and the air that flows into the heater core 12 and is heated (temperature The ratio of the amount of wind) is adjusted by the opening degree of the air mix damper 14. Further, a warm air passage 16 is formed between the air outlet surface 12b of the heater core 12 and the case surface 9b opposed to the air outlet surface 12b with a predetermined gap. A guide plate 28 formed integrally with the case 9 projects into the warm air passage 16, and this guide plate 28 directs a part of the warm air toward the cold air side to mix the hot air and the cold air. Is. An air guide 30 is fixed to the case surface 9b with screws 31 at a predetermined interval. This air guide
30 forms a warm air bypass passage 29 that guides a part of the warm air to the outlet side of the upper part of the case without mixing with the cool air. The shape of the air guide 30 is as shown in FIG. 2, and includes an opening 35 that opens to the air outlet side 12b of the heater core 12, an outlet 32 that guides warm air to the defroster outlet 19, and both sides. It has a guide 33 and a discharge port 34 for guiding warm air to the upper outlet 23. Further, by making the width of the air guide 30 slightly smaller than the size of the upper outlet 21 in the central portion, the air guide 30 can be easily assembled in the unit body 8 from the upper outlet 21. On the other hand, above the heater core 12, an auxiliary damper 17 is arranged in a portion extending from the cold air passage 15 to the warm air passage 16, and the auxiliary damper 17 is rotatable about a shaft 18. . This auxiliary damper 17 is formed in a V-shape so as to guide the cold air and improve the mixing property of the cold and hot air.

A defroster outlet 19 for blowing warm air onto the front glass 1 is provided at the top of the case 9, and the defroster outlet 19 is opened and closed by a damper 20 rotatable about a shaft 26. . At the bottom of the defroster outlet 19 and above the auxiliary damper 17,
An upper outlet 21 at the center is provided on the front side of the case 9. The upper outlet 21 blows wind toward the upper half of the occupant's body and is opened and closed by a damper 22. Damper 22
Is configured to be rotatable around a shaft 27.
Also, at the bottom of the defroster outlet 19 and at the auxiliary damper 17
The upper outlets 23 on both sides are provided on both the left and right sides of the case 9 so as to be located above. The upper outlets 23 on both sides communicate with the outlet grills provided on both left and right sides of an automobile instrument panel (not shown) through ducts not shown, and dampers provided at the outlet grilles (not shown). By manually opening and closing (1)), the ventilation to the upper outlets 23 on both sides is interrupted. The blowing grill can blow the blowing air to the side glass of the automobile by operating the wind direction plate.

Further, a lower outlet port 24 is provided in a portion of the left and right side surfaces of the case 9 which communicates with the warm air passage 16 above the heater core 12, and the lower outlet port 24 has a lower outlet duct (not shown). The lower outlet duct is formed so as to blow the wind toward the foot of the occupant. Also,
The lower outlet 24 is opened and closed by a damper 25.

FIG. 3 shows the main part of the air conditioning control panel 40 installed near the driver's seat in the vehicle interior. 14a is the air mix damper 14
Use the operation dial of to set the damper 14 to the maximum heating position 1 in Fig. 1.
It is operated continuously within the range from 4'to the maximum cooling position 14 ". The auxiliary damper 17 is operated in conjunction with the air mix damper 14, and the air mix damper 14 is moved to the maximum cooling position 14". When operated, it moves from the 17 ′ position to the 17 ″ position. 20a is the operation lever of the damper 20, 25a is the operation lever of the damper 25. 41 is the refrigerant compressor of the refrigeration cycle , A compressor operation switch for controlling the on / off of the electromagnetic clutch, 42 a fan switch for switching the operation of the blower fan 7 on and off, and a speed switching, 42 an inside air switch forcibly setting the inside air intake mode, and 43 forcibly a defroster mode. The damper 22 can be manually operated by an operating lever (not shown) provided near the upper outlet 21.

Next, the operation of this embodiment with the above configuration will be described. The air selected and sucked by the occupant from the inside air and outside air inlets provided in the blower unit 6 is first sent to the cooler core 10 where it is dehumidified and cooled. Next, the cool air that has passed through the cooler core 10 and has been dehumidified and cooled is cooled by the air mix damper 14
Are distributed to the heater core 12 and the cold air passage 15 in accordance with the operating position of the. For example, if the air mix damper 14 is at the 14 ″ position, all cold air will be guided to the cold air passage 15 and each air outlet (1
Blow cold air from (9,21,23,24). Also, if the air mix damper 14 is at the position 14 ', all the cool air will flow to the heater core 12
It enters and becomes warm air D here, and each outlet (19,2
Blow hot air from 1,23,24). In addition, 14 'and 14 "above
When the air mix damper 14 is located at an arbitrary intermediate position between and, the warm air and the cold air are adjusted to predetermined distribution amounts according to the damper opening. Therefore, when the air mix damper 14 is located at any position between 14 ′ and 14 ″ and the auxiliary damper 17 is located at 17 ′, the cold air that has entered the heater core 12 is warmed by the heater core 12 and warm air. It becomes D and enters the hot air passage 16 which also serves as a mixing chamber, and the remaining cold air distributed by the air mix damper 14 passes through the cold air passage 15 and
It is guided by the auxiliary damper 17 to bypass the side surface of the heater core 12 as shown by the arrow A, enters the warm air passage 16, is mixed with the warm air D that has passed through the heater core 12, is adjusted to a predetermined temperature, and is blown to each blower. You will be led to the exit (19, 21, 23, 24). Here, the temperature of the blown air is adjusted by operating the air mix damper 14 with the operation dial 14a shown in FIG. 3 to change the damper opening.
By changing the mixing ratio of cold air and warm air, an arbitrary blown air temperature can be continuously obtained from low temperature to high temperature.

By the way, when the occupant requests only cool air as in the case of maximum cooling, the air mix damper is operated to the position of 14 ″ and the auxiliary damper 17 is operated to the position of 17 ″, so that the cool air is indicated by arrows B and C. As above, the upper outlet for cold air blowout 2
Although it has the advantage that it can reach 1,23 in the shortest distance and reduce ventilation resistance, the auxiliary damper 17 is in the 17 'position and the mix of cold air and warm air depends on the opening of the air mix damper 14. When controlling the temperature by adjusting the ratio, if you set the full open mode with all the outlets (19,21,23,24) open, the defroster outlet 19 and the upper outlet (21,23) will Since they are close to each other, the temperature of the air outlet becomes almost the same as shown in FIG. 4 with the conventional configuration. Therefore, in the present invention, the air guide 30 is additionally installed. Next, the operation of the air guide 30 will be described. The warm air D passing through the heater core 12 is mixed with the cold air A passing through the cold air passage 15. Mix in the hot air passage 16 that doubles as a chamber. However, a part of the warm air D passes through the warm air passage 29 from the opening 35 of the air guide 30 along the inner wall 9b of the case 9 without mixing with the cool air, and is discharged from the air guide 30. From the outlets 32 and 34, the air is blown toward the defroster outlet 19 and the upper outlets 23 on both sides as indicated by arrow F. The warm air F and the cold air E mixed with the warm air partially in the warm air passage 16 are further mixed and blown out from the outlets (19, 23). In this way, since the warm air is guided to the defroster outlet 19 and the upper outlets 23, 23 on both sides by the air guide 30, as shown in FIG. 5, in the device of the present invention, as shown in FIG. The blowing temperature rises, and the operation position of the operation dial 14a is wide,
In addition to providing temperature control characteristics that provide a sufficient defroster effect and side demist effect, it is also possible to control head cold foot heat. The upper and lower temperature differences can be freely changed by changing the size of the opening 35 of the air guide 30 and the size of the discharge ports (32, 34). Further, in the present embodiment, the full open mode has been described, but by operating each of the dampers 20, 22, 25 independently, the occupant can freely select the air outlet that suits his or her preference. Moreover, by combining the air mix damper 14 and the auxiliary damper 17, the outlet air temperature can be satisfactorily adjusted and a comfortable temperature distribution of head cold foot heat can be easily achieved.

Further, although the auxiliary damper 17 is movable in this embodiment, the present invention can be similarly implemented in a state in which the auxiliary damper 17 is fixed at the position 17 ', that is, in the layout in which the damper structure is eliminated and the case 9 is integrally molded. Further, even in an air conditioner that does not have the cooler core 10, the air guide 30 according to the present invention can exhibit the same effect.

Further, the air guide 30 can be modified in various ways, as shown in FIG. 6, for example, the mounting stay portion 36 tightened by the screw 31 can be made into a small rectangular shape. Further, although the air guide 30 according to the present invention is fixed by the screw 31, it can be fixed similarly by other fixing means such as a rivet.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the device of the present invention, FIG.
The figure is a perspective view of the main part of FIG. 1, and FIG. 3 is the air conditioning control panel 40.
FIG. 4 is a graph showing the temperature control performance of the conventional apparatus, and FIG. 5 is a graph showing the temperature control performance of the apparatus of the present invention.
The figure is a perspective view showing another example of the air guide according to the present invention. 12 …… Heater core, 14 …… Air mix damper, 15 ……
Cold air passage, 16 …… warm air passage, 19 …… defroster outlet,
21 …… Upper outlet in the center, 23 …… Upper outlet on both sides, 24 …… Lower outlet, 29 …… Hot air bypass, 30 ……
Air guide, 35 ... Opening.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masahiro Yonezawa, 1-1, Showa-cho, Kariya city, Aichi Nihon Denso Co., Ltd. (56) References: 58-99114 (JP, U)

Claims (1)

[Claims] 1. A heater core for heating blast air; (b) An air mix damper for adjusting the air flow rate ratio between warm air that flows into the heater core and is heated and cold air that does not pass through the heater core; A cold air passage through which cool air does not pass through the heater core; (d) a hot air passage through which warm air heated by the heater core flows; and (e) cold air through the cold air passage and warm air through the hot air passage. A defroster outlet for blowing out air to the windshield of the vehicle, provided so that the mixed air flows in.
An upper air outlet in the center for blowing air toward the upper body of the occupant, upper air outlets on both sides that can blow air on the side glass of the automobile, and a lower air outlet for blowing air to the feet of the occupant. (F) an air guide provided inside the case containing the heater core at a position where hot air flows from the hot air passage, and (g) the hot air passage is provided by the air guide. A hot air bypass passage through which warm air from the inside of the case is formed, and (h) an outlet for introducing warm air to the defroster outlet at the outlet of the hot air bypass passage, and above both sides. An air conditioner for an automobile, comprising: a discharge port that guides warm air to a blowout port; both discharge ports; and a guide that divides these discharge ports and guides a discharge direction of the warm air.