JP3977686B2 - Air conditioning unit for vehicles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle air conditioning unit.
[0002]
[Prior art]
Conventionally, as a vehicle air-conditioning unit, for example, one having the following configuration is known.
[0003]
Japanese Utility Model Laid-Open No. 59-169214 discloses a vehicle air conditioning unit having a detachable shielding plate in which a rectangular hole is formed instead of an evaporator. Japanese Laid-Open Patent Publication No. 3-213417 discloses a vehicle air conditioning unit having an air volume adjusting plate in which a plurality of through holes are formed instead of an evaporator. And any structure can produce the airway pressure loss equivalent to an evaporator.
[0004]
Japanese Utility Model Laid-Open No. 60-6612 discloses an air conditioning unit for a vehicle that includes a plurality of bent plates for capturing condensed water scattered from an evaporator and rectifying an air flow.
[0005]
[Problems to be solved by the invention]
However, in the former two configurations, it is both a flat plate that causes pressure loss in the air flow. Therefore, from a blower fan in which the velocity distribution is non-uniform simply by making a rectangular hole or a plurality of through holes. It is difficult to properly convert the blown air into a uniform flow.
[0006]
In the latter configuration, the air flow can only be rectified, and it is impossible to obtain a uniform flow by pressure loss.
[0007]
Then, this invention makes it a subject to provide the vehicle air conditioning unit which can equalize an air flow appropriately according to the structure of an air conditioning unit, when an evaporator is not required.
[0008]
[Means for Solving the Problems]
As a means for solving the above problems, the present invention provides:
In a vehicle air conditioning unit including a blower unit in which a blower fan is disposed, a cooling unit in which an evaporator can be disposed, and a heater unit in which a heater core is disposed,
The blower unit includes an air flow path for flowing the air in a spiral shape along the rotational direction of the blower fan,
The cooling unit is provided with a resistance plate in place of the evaporator in a region where the evaporator is provided,
The resistance plate is formed with a plurality of openings having a smaller opening area at a position where the flow velocity is larger according to the flow velocity distribution of the air from the blower fan , and the high-speed air from the blower fan is first. It is formed in a staircase shape so as to collide .
[0009]
With this configuration, when air with an uneven wind speed distribution flows by the blower fan, the larger the flow velocity, the greater the pressure loss when passing through the opening, so it passes on the high speed side compared to the low speed side. The amount of air does not increase, and a uniform flow can be obtained on the downstream side of the resistance plate.
[0011]
Further, the present invention provides a means for solving the above-described problems,
In a vehicle air conditioning unit including a blower unit in which a blower fan is disposed, a cooling unit in which an evaporator can be disposed, and a heater unit in which a heater core is disposed,
Integrating the cooling unit and the heater unit;
Connected to the blower unit via a direction changing unit that changes the direction of air blown from the blower fan in a substantially right angle direction;
In the region where the evaporator is disposed, a resistance plate having an opening formed in place of the evaporator is disposed,
The resistance plate is large if the flow velocity is large according to the flow velocity distribution of the air from the blower fan in the region downstream of the air flow from the blower unit and in the region where the direction is changed by the direction changing portion. A plurality of openings having a smaller opening area as the position is formed, and are formed stepwise so that the high-speed air from the blower fan collides first .
[0012]
With this configuration, it is possible to increase the air resistance in the air flow downstream side of the direction changing portion, that is, in the region where the air from the blower fan easily flows, and to obtain a uniform flow downstream of the resistance plate. Become.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments according to the present invention will be described below with reference to the accompanying drawings.
[0015]
1 and 2 show a vehicle air conditioning unit according to this embodiment. This air conditioning unit is a unit in which a cooling unit and a heater unit are integrally provided. In the unit main body 1, a resistance plate 2, an air mix damper 3, and a heater core 4 are arranged in this order from the inlet 5 side. is there.
[0016]
The unit body 1 is formed by joining and integrating a pair of casings 1a and 1b. In the unit main body 1, a first holding portion 6 for holding the resistance plate 2 is formed in the vicinity of the inflow port 5 formed in the lower front portion. The 1st holding | maintenance part 6 is comprised by the guide recessed part 6a of cross-sectional substantially U shape formed in an opposing wall surface, respectively. A substantially V-shaped wall surface is formed on the downstream side of the first holding portion 6, and a first rectangular hole 7 and a second rectangular hole 8 that are opened and closed by the air mix damper 3 are formed. Downstream of the second rectangular hole 8 is a second holding portion 9 that holds the heater core 4. The second holding part 9 is also composed of an opposing guide concave part 9 a similar to the first holding part 6. On the downstream side of the second holding part 9, the air flow is converted into a substantially U shape by the arc-shaped wall surface, and the air distribution area M is mixed with the air after passing through the first rectangular hole 7 to the air distribution chamber 10. It is connected with. In the air distribution chamber 10, a differential damper 11, a vent damper 12, and a heat damper 13 are provided so as to be rotatable about the support shafts 11a, 12a and 13a, respectively. The differential damper 11 opens and closes a differential outlet 14 for supplying air to the windshield at the front of the vehicle. The vent damper 12 opens and closes a vent outlet 15 for supplying air to the front portion of the vehicle. The heat damper 13 opens and closes a front heat outlet 16 and a rear heat outlet 17 that communicate with the front and rear feet of the vehicle, respectively.
[0017]
As shown in FIG. 3, the resistance plate 2 has a configuration in which a plate member 20 having an opening 19 is provided in a frame 18 having substantially the same shape as the evaporator. The frame 18 is formed with guide portions 21 that are guided by the guide recesses 6 a of the first holding portion 6 at both ends. The guide portion 21 is formed hollow for weight reduction and is reinforced by a plurality of ribs 21a provided on the inner surface. Openings 19a and 19b partitioned by the partition wall 2a are formed in the plate member 20, respectively. The opening 19a has an opening area smaller than that of the opening 19b, and the airflow resistance when air passes through is large. For this reason, the difference in opening area plays a role of making the flow velocity uniform with respect to the air flow having a non-uniform flow velocity. That is, the air blown from the blower unit is performed by a sirocco fan, and a swirling flow is generated along the outer peripheral wall of the casing in which the sirocco fan is accommodated. The flow velocity of the swirling flow increases as it approaches the outer peripheral wall side, and the flow velocity on the casing 1b side increases in the region where the resistance plate 2 is disposed. In the resistance plate 2, the flowing air is decelerated when passing through the opening 19 a having a large ventilation resistance, whereas the ventilation resistance received when passing through the opening 19 b is small. Therefore, the mixed state of the cold air and the hot air in the air mixing region M becomes good, and a substantially uniform temperature distribution can be obtained. The closed part of the upper half is reinforced by ribs 20a formed in a lattice shape.
[0018]
The air mix damper 3 is provided so as to be rotatable about a support shaft 3a provided at the apex of a substantially V-shaped wall surface formed in the unit body 1, and the openings 19a and 19b of the resistance plate 2 are provided. The air that has passed is diverted, and one of them is directed to the heater core 4. The turning position of the air mix damper 3 is determined based on various conditions inside and outside the vehicle, such as the inside air temperature, the outside air temperature, and the amount of solar radiation.
[0019]
The heater core 4 is engaged with each holding recess 9a constituting the second holding portion 9 provided downstream of the first rectangular hole 7 in the unit body 1, and cooling water from an engine (not shown) flows inside. To heat the air passing outside.
[0020]
Next, the operation of the vehicle air conditioning unit having the above configuration will be described.
[0021]
When outside air or inside air flows into the unit main body 1 from the blower unit (not shown) through the inflow port 5, the air first passes through the openings 19 a and 19 b of the resistance plate 2. As described above, the opening area of the resistance plate 2 is different between the openings 19a and 19b, and the ventilation resistance is increased in a region where the flow velocity is high. Therefore, the air passing through the opening 19a of the resistance plate 2 is decelerated, while the air passing through the opening 19b passes through without being decelerated, and the flow velocity becomes substantially uniform. The air that has passed through the openings 19a and 19b of the resistance plate 2 and has a uniform flow velocity is divided by the air mix damper 3, and one of the air flows to the heater core 4 through the second rectangular hole 8. Then, the other reaches the air mixing region M directly through the first rectangular hole 7. For this reason, the air mixing state in the air mixing region M becomes favorable, and variations in temperature distribution are reduced. The air mixed in the air mixing region M is blown into the vehicle through the air outlets 14 to 16 that are opened and closed by the rotational positions of the dampers 11 to 13.
[0022]
In addition, although the said embodiment demonstrated the integrated air conditioning unit, as shown in FIG. 5, it is good also as a structure which connects the blower unit 22, the cooling unit 23, and the heater unit 24 in series. In any case, it is preferable to preferentially decelerate the high-speed air flow blown from the blower unit by partially bending the resistance plate 2. In addition, as shown in FIG. 6, the air conditioning unit may be configured such that the cooling unit and the heater unit are integrated, and the direction of the air from the blower unit is changed in a substantially perpendicular direction by the direction changing unit 25. . In this case, the speed is high in the downstream region of the air flow from the blower unit 22, but the resistance plate 2 in that portion is approaching, so that the ventilation resistance is increased and the speed can be reduced.
[0023]
Further, as shown in FIG. 4, the resistance plate 2 may be configured by a plurality of openings 19 formed according to the difference in air velocity distribution. The opening 19 can take various shapes such as an ellipse and a rectangle. Moreover, it is good also as providing the unevenness | corrugation in the surface of the resistance board 2, and adjusting the flow direction of air.
[0024]
【The invention's effect】
As is clear from the above description, according to the present invention, the air after passing according to the flow velocity distribution of the air from the blower fan, according to the flow velocity distribution of the air from the blower fan, in the region where the evaporator is disposed. Since the resistance plate provided with the opening is provided so that the speed and the air flow are uniform, it is possible to obtain a uniform air flow over the entire downstream region of the resistance plate.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a vehicle air conditioning unit according to an embodiment.
FIG. 2 is a cross-sectional view of the vehicle air conditioning unit according to the present embodiment.
3 is a plan view showing an example of a resistance plate shown in FIGS. 1 and 2. FIG.
4 is a plan view showing another example of the resistor plate shown in FIGS. 1 and 2. FIG.
FIG. 5 is a cross-sectional view showing another example of a vehicle air conditioning unit.
FIG. 6 is a cross-sectional view showing another example of a vehicle air conditioning unit.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Unit main body 2 ... Resistance board 3 ... Air mix damper 4 ... Heater core 5 ... Inlet 6 ... 1st holding part 7 ... 1st rectangular hole 8 ... 2nd rectangular hole 9 ... 2nd holding part 10 ... Air distribution chamber 11 ... Differential damper 12 ... Vent damper 13 ... Heat damper 14 ... Differential outlet 15 ... Vent outlet 16 ... Front side heat outlet 17 ... Rear side heat outlet 18 ... Frame 19 ... Opening part 20 ... Plate material 21 ... Guide part

Claims (2)

In a vehicle air conditioning unit including a blower unit in which a blower fan is disposed, a cooling unit in which an evaporator can be disposed, and a heater unit in which a heater core is disposed,
The blower unit includes an air flow path for flowing the air in a spiral shape along the rotational direction of the blower fan,
The cooling unit is provided with a resistance plate in place of the evaporator in a region where the evaporator is provided,
The resistance plate is formed with a plurality of openings having a smaller opening area at a position where the flow velocity is larger according to the flow velocity distribution of the air from the blower fan , and the high-speed air from the blower fan is first. An air conditioning unit for a vehicle characterized by being formed in a staircase shape so as to collide . In a vehicle air conditioning unit including a blower unit in which a blower fan is disposed, a cooling unit in which an evaporator can be disposed, and a heater unit in which a heater core is disposed,
Integrating the cooling unit and the heater unit;
Connected to the blower unit via a direction changing unit that changes the direction of air blown from the blower fan in a substantially right angle direction;
In the region where the evaporator is disposed, a resistance plate having an opening formed in place of the evaporator is disposed,
The resistance plate is large if the flow velocity is large according to the flow velocity distribution of the air from the blower fan in the region downstream of the air flow from the blower unit and in the direction changed by the direction changing portion. A vehicular air conditioning unit characterized in that a plurality of openings having a smaller opening area as the position is formed and stepwise so that the high-speed air from the blower fan collides first .

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