JP4436020B2 - Air conditioner for vehicles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle air conditioner, and more particularly, to a vehicle air conditioner that performs air conditioning by using an evaporator and a heater core.
[0002]
[Prior art]
In recent years, an evaporator, which is a heat exchanger for cooling, and a heater core, which is a heat exchanger for heating, are integrated into an integrated unit, thereby expanding the foot space in the passenger compartment and reducing the cost ( Car air conditioner unit) has been developed.
Conventional examples of such a vehicle air conditioner are disclosed in Japanese Patent Laid-Open Nos. 10-250344 and 10-250345.
[0003]
As an example, a conventional example disclosed in Japanese Patent Laid-Open No. 10-250345 will be described with reference to FIG. As shown in FIG. 3, the conventional vehicle air conditioner 50 has a casing 52, and an air inlet 54 for introducing air sent from a blower (not shown) into the evaporator 56 and the introduction of the air into the casing 52. An evaporator 56 that cools the cooled air and a heater core 58 that heats the cooled air from the evaporator 56 that is disposed in the lower rear half of the evaporator 56 are disposed. A partition plate 60 is disposed behind the heater core 58 in the casing 52, and the partition plate 60 mixes the air heated by the heater core 58 with the cooling air from the evaporator 56. 62 is led.
[0004]
Behind the evaporator 56 are provided a cooling air damper 63 for adjusting the amount of air that bypasses the heater core 58 and a heating air damper 64 for adjusting the amount of air flowing into the heater core 58. The amount of air and the amount of heated air can be adjusted. A foot passage 66 is formed between the partition plate 60 and the rear portion 52a of the casing 52, and a foot outlet 72 is provided at the lower end.
Further, in the upper part of the casing 52, a vent outlet 68 is provided in the vicinity of the mix region 62, and a defrost outlet 70 is provided in front of the vent outlet 68. A vent damper 74, a defrost damper 76, and a foot damper 78 are provided at these air outlets 68, 70, 72, respectively.
[0005]
In such a conventional vehicle air conditioner, various modes (for example, a vent mode, a vent and foot mode, a foot mode, a foot mode, and the like are controlled by operating the five dampers 63, 64, 74, 76, and 78). The air at a desired temperature is blown out from the vent outlet 68, the defrost outlet 70 and / or the foot outlet 72 in the foot & defrost mode or the defrost mode.
[0006]
[Problems to be solved by the invention]
Now, a plan sectional view of the vicinity of the evaporator 56 of the conventional vehicle air conditioner is shown in FIG. As shown in the drawing, the air introduced from the air inlet 54 is introduced into the evaporator 56 through a space 54 ′ having a uniform flow path cross-sectional area. For this reason, the air flow is biased toward the downstream side of the space 54 ′, and is introduced to the evaporator 56 while being biased toward the downstream side as indicated by the symbol A. For this reason, the cooling capacity of the evaporator 56 cannot be fully exhibited, and there are problems such as dew escaping due to the deviation of the wind speed and the difference between the left and right air volumes.
[0007]
This invention is made | formed in view of the said situation, and it aims at providing the air conditioning apparatus which can equalize the air which flows in into an evaporator, and can obtain high cooling capacity.
[0008]
[Means for Solving the Problems]
The invention according to claim 1 includes a casing, an evaporator disposed at a front portion in the casing, and a blower diffuser portion that guides air sent from the blower to the evaporator, and the blower diffuser portion includes A vehicle air conditioner configured to guide air from a lateral direction with respect to one side surface of an evaporator, the flow path cross-sectional area of which is configured to be smaller toward the downstream side. The defrost passage and the blower diffuser portion are located close to each other, and the front wall portion of the defrost passage is substantially parallel to the evaporator. It is formed along the shape which is smaller configuration toward the downstream side flow path cross-sectional area of the wall portion wherein the blower diffuser And wherein the door.
[0009]
In this vehicle air conditioner, since the flow path width on the downstream side of the blower diffuser portion is small, air is not biased to the downstream end, and air uniformly flows into the evaporator. The blower diffuser section may be guided from either the vertical or horizontal direction with respect to one side surface of the evaporator. Moreover, the space which reduced the downstream flow path width of the blower diffuser part can be used for a defrost channel | path. For this reason, the position of a defrost channel | path can be made to approach the casing center side more.
[0010]
According to a second aspect of the invention, in the vehicle air conditioning apparatus according to claim 1, a heater core disposed in substantially upright behind the evaporator, are formed on and above the heater core behind the evaporator, a heater core It is formed by a mix region that mixes the bypassed air and the air that has passed through the heater core, a partition plate that is arranged to guide the air that has passed through the heater core to the mix region, a rear portion of the casing, and the partition plate. A foot passage, a defrost passage that communicates with the lower end of the foot passage and opens upward from the lower part of the casing, and a vent through which conditioned air guided from the vicinity of the mixing region of the casing is blown into the vehicle interior An air outlet, a foot air outlet formed at the lower end of the foot passage of the casing, and the differential A defrost outlet formed at the upper end of the strike passage, the amount of air that bypasses the heater core among the air that has passed through the evaporator, a temperature adjustment damper that adjusts the amount of air that passes through the heater core, and the vent blower A vent damper that opens and closes the outlet, a foot damper that opens and closes the foot outlet, and a defrost damper that opens and closes the defrost outlet.
[0011]
In this invention, the vent outlet is formed in the vicinity of the mixing region, the foot outlet is formed at the lower end of the foot passage, and the defrost passage is communicated with the lower end of the foot outlet and is formed along the outside of the casing. Since the defrost outlet is formed at the upper end of the defrost passage, the desired relationship is “air temperature at the defrost outlet”> “air temperature at the foot outlet”> “air at the vent outlet” The relationship “temperature” can be obtained naturally.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, the code | symbol 1 has shown the air conditioning apparatus for vehicles concerning this embodiment. The vehicle air conditioner 1 includes a casing 2, and an evaporator (evaporator) 4 that is a heat exchanger for cooling is disposed substantially upright on the vehicle front side in the casing 2. Air that is guided by the blower diffuser section 3 is introduced into the evaporator 4. A heater core 6 which is a heat exchanger for heating is disposed behind the evaporator 4 (behind the vehicle). Downstream of the evaporator 4 is branched into a bypass passage 10 extending in a substantially horizontal direction from the evaporator 4 to bypass the heater core 6, and a passage 10 ′ descending from the evaporator 4 and passing through the heater core 6. Further, a heater passage 12 is formed downstream of the heater core 6, and the heater passage 12 joins the bypass passage 10 with the downstream side facing upward.
A wall portion on the vehicle rear side of the heater passage 12 is a partition plate 8, and a foot passage 14 is formed between the partition plate 8 and the rear wall 2 a of the casing 2. The heater passage 12 joins the bypass passage 10, is connected to the foot passage 14, goes around the partition plate 8, and descends. The upper end portion 8a of the partition plate 8 is formed so as to be bent substantially forward and is formed in a streamline shape.
Further, a defrost passage 16 is formed which communicates with the lower end side of the foot passage 14 and opens upward from below the casing 2 through the front. The defrost passage 16 is located close to the blower diffuser section 3. Reference numeral 17 denotes an instrument panel (instrument panel).
[0013]
FIG. 2 shows a cross-sectional view taken along line II in the vicinity of the defrost passage 16 and the blower diffuser portion 3.
The blower diffuser portion 3 forms a flow channel that flows in from the lateral direction with respect to the front surface (one side surface) of the evaporator 4, and the flow channel cross-sectional area becomes smaller toward the downstream side. In the defrost passage 16, the wall portion 16 a at the front side of the vehicle is substantially parallel to the evaporator 4, but the wall portion 16 b at the rear side of the vehicle has a shape that follows the shape of the blower diffuser portion 3. For this reason, the defrost passage 16 has a configuration in which the cross-sectional area on one side in the width direction is large and the cross-sectional area on the other side is small.
[0014]
As shown in FIG. 1, at the junction of the downstream side of the bypass passage 10 and the upper side of the heater passage 12, the air cooled by the evaporator 4 and passing through the bypass passage 10 and the heater passage 12 heated by the heater core 6 are heated. The mixing area | region 18 with which the air which passes through is mixed is formed.
Further, a temperature adjusting damper 20 is provided in the bypass passage 10 on the downstream side of the evaporator 4. The temperature adjusting damper 20 is for adjusting the amount of air that has not passed through the heater core 6 and the amount of air that has passed through the heater core 6 out of the air that has passed through the evaporator 4. The temperature adjusting damper 20 can set the opening degree from fully closed (0%) to fully open (100%). In FIG. 1, the position indicated by the solid line is the 0% opening state, and the position indicated by the chain line is the 100% opening state. The opening degree of the temperature adjusting damper 20 is adjusted by a damper driving motor (not shown).
[0015]
Further, a vent passage 21 is provided in the upper rear part of the casing 2 in the vicinity of the mix region 18, and an outlet 22 is provided at the downstream end. Further, a foot blower outlet 24 is provided at the rear lower end portion of the casing 2, that is, a lower end portion of the foot passage 14, and a defrost blowout port 26 is provided at the upper front portion of the defrost passage 16.
A vent damper 28 is provided at a branch portion between the vent passage 21 and the foot passage 14, and a foot defrosting damper 30 is provided at the foot outlet 24. Here, the foot defrost combined damper 30 is provided at a branch portion between the foot passage 14 and the defrost passage 16 and also has a damper function of both the foot damper and the defrost damper. Therefore, a defrost damper is separately provided. There is no need.
In the present embodiment, the foot damper and the defrost damper may be provided independently. In this case, the defrost damper is provided at the defrost outlet.
[0016]
By being configured in this way, the air conditioner in the present embodiment can obtain the following effects.
Since the flow passage cross-sectional area on the downstream side of the blower diffuser portion 3 is small, the air is not biased to the downstream end, and the air uniformly flows into the evaporator 4. For this reason, it is possible to improve the cooling capacity, prevent dew jumping, and make the right and left air volumes appropriate.
A space obtained by reducing the downstream flow path width of the blower diffuser section 3 can be used for the defrost passage 16. For this reason, space can be used effectively and space saving of the whole air conditioning apparatus can be realized.
In the conventional air conditioner, the defrost outlet 70 is provided directly above the casing 52. However, when the instrument panel 17 is obstructed and the defrost outlet cannot be provided directly above, as in the present embodiment. In addition, the defrost passage 16 can be installed by avoiding the instrument panel 17 by turning the defrost passage 16 below the casing 2 and guiding it upward.
[0017]
Moreover, each blower outlet is provided in order of the vent blower outlet 22, the foot blower outlet 24, and the defrost blower outlet 26 from the side close | similar to the evaporator 4 along the casing 2. As shown in FIG. As a result, according to the present embodiment, in the vehicle air conditioner, the relationship of the temperature of the air blown out from each outlet, which is originally required, is naturally “air temperature at the defrost outlet”> “ It satisfies the relationship of “air temperature of foot outlet”> “air temperature of vent outlet”.
Further, since the foot defrost damper 30 is provided at the communication portion between the foot passage 14 and the defrost passage 16, there is no need to separately provide a defrost damper. As a result, the damper which is a movable member can be reduced to one, and the reliability can be improved accordingly.
Furthermore, since the upper end portion 8a of the partition plate 8 is bent so as to face substantially forward, the air heated by the heater core 6 can be supplied to the upstream side of the mix region 18, and the evaporator. Mixing with the cooling air from 4 is promoted, and the mix area 18 can be made small.
[0018]
In the above embodiment, the air conditioner having a configuration in which the defrost passage 16 is opened upward from the lower part of the casing through the front is shown. However, in the conventional air conditioner shown in FIG. The blow diffuser unit 3 may be applied.
[0019]
【The invention's effect】
As described above, the following effects can be obtained in the present invention.
According to the first aspect of the present invention, since the flow path width on the downstream side of the blower diffuser portion is small, air is not biased to the downstream end, and air uniformly flows into the evaporator. Therefore, sufficient cooling capacity can be obtained. In addition, it is possible to prevent the exposure due to the deviation of the air volume and to make the right and left air volumes appropriate. Furthermore, the space which reduced the downstream flow path width | variety of a blower diffuser part can be used for a defrost channel | path. For this reason, the position of a defrost channel | path can be made to approach the casing center side more, and size reduction of an apparatus can be implement | achieved.
According to the second aspect of the present invention, the relationship “air temperature at the defrost outlet”> “air temperature at the foot outlet”> “air temperature at the vent outlet” can be naturally obtained.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a vehicle air conditioner shown as an embodiment of the present invention.
FIG. 2 is a plan sectional view showing the vicinity of an evaporator of the vehicle air conditioner.
FIG. 3 is a side sectional view of a conventional vehicle air conditioner.
FIG. 4 is a plan sectional view showing the vicinity of an evaporator of the vehicle air conditioner.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Vehicle air conditioner 2 Casing 3 Blower diffuser part 4 Evaporator 6 Heater core 8 Partition plate 10 Bypass passage 12 Heater passage 14 Foot passage 16 Defrost passage 18 Mix area 20 Temperature adjustment damper 22 Vent outlet 24 Foot outlet 26 Defrost blow Outlet 28 Vent damper 30 Foot defrost damper

Claims (2)

A casing, and an evaporator disposed in a front portion of the casing;
A blower diffuser section for guiding the air sent from the blower to the evaporator;
The blower diffuser portion is configured to guide air from a lateral direction with respect to one side surface of the evaporator, and the flow passage cross-sectional area is a vehicle air conditioner configured to be smaller toward the downstream side ,
A defrost passage that opens upward from the lower side of the casing through the front is provided, and the defrost passage and the blower diffuser portion are close to each other,
The defrost passage is formed along a shape in which a front wall portion thereof is substantially parallel to the evaporator, and a wall portion on the casing side is configured such that a flow passage cross-sectional area of the blower diffuser portion is smaller toward the downstream side. air conditioning apparatus for a vehicle, characterized in that there. The vehicle air conditioner according to claim 1 ,
A heater core disposed substantially upright behind the evaporator;
A mix region formed behind the evaporator and above the heater core, for mixing the air bypassing the heater core and the air passing through the heater core;
A partition plate arranged to guide the air that has passed through the heater core to the mix region;
A foot passage formed by a rear portion of the casing and the partition plate;
A defrost passage that communicates with the lower end of the foot passage and opens upward from below the casing through the front;
A vent outlet from which the conditioned air guided from the vicinity of the mixing area of the casing is blown into the vehicle interior;
A foot outlet formed at the lower end of the foot passage of the casing;
A defrost outlet formed at the upper end of the defrost passage;
Of the air that has passed through the evaporator, the amount of air that bypasses the heater core, and the temperature adjustment damper that adjusts the amount of air that passes through the heater core,
A vent damper for opening and closing the vent outlet;
A foot damper that opens and closes the foot outlet;
A defrost damper for opening and closing the defrost outlet,
A vehicle air conditioner characterized by comprising:

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