JP4655256B2 - Intake box for vehicle air conditioner - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention is a vehicle air conditioner having an air blower and temperature adjusting means in a case and having an action of blowing out temperature-adjusted air into a vehicle interior, and is provided on the upstream side of the air blower to select inside air or outside air It relates to the intake box to be introduced.
[0002]
[Prior art]
Conventionally, a vehicle air conditioner adjusts the temperature in the passenger compartment to a desired temperature, and cool air obtained from a blower, a cooling heat exchanger, a heating heat exchanger, and a cooling heat exchanger in a case, It has blown air temperature adjusting means such as an air mix door that changes the mixing ratio with the warm air obtained from the heat exchanger for heating. The upstream side of the air blower of the vehicle air conditioner is provided with an outside air introduction port for introducing air outside the vehicle and an inside air introduction port for introducing vehicle interior air, and selectively opens and closes both the introduction ports. An air introduction device having an inside / outside air switching door is provided.
[0003]
As this conventional example, for example, the specification and drawings of Japanese Utility Model Laid-Open No. 62-4410 can be shown. This conventional example aims to reduce the noise by securing the amount of inside air introduced, and copes with the expansion of the area of the inside air inlet. That is, the inside air inlets 26a, 26b, and 26c are formed in portions of the four side walls facing the engine room side, the side panel side, and the driver side. The outside air inlet 3 is at a position facing the upper surface, that is, the through hole 5 leading to the blower.
[0004]
The specification and drawings of Japanese Utility Model Laid-Open No. 62-144709 show that the flow of air flowing into the intake box becomes a spiral airflow along the rotation direction of the centrifugal fan, and the pressure loss and noise are reduced. The inside air inlet 25 is formed in the side wall 24 for the purpose of reducing the inside air inlet 25, and the longitudinal center axis of the inside air inlet 25 is eccentrically provided in the direction of rotation of the centrifugal fan from the longitudinal center axis of the side wall. . In addition, the external air introduction port 3 exists in the position facing the upper surface, ie, the through-hole 5 which leads to an air blower.
[0005]
[Problems to be solved by the invention]
In recent years, air conditioners (vehicle air conditioners) used mainly in light vehicles and small class vehicles have been installed vertically and integrated with a blower and a cooling / heating device in order to reduce size, weight, and number of parts. And a separate intake box. This intake box has a structure as in the above-described conventional example (that is, integral with the blower and vertically placed), and the intake box case has a cylindrical shape, and the outside air inlet and the inside air inlet are provided on the cylindrical wall surface. The rotary door is formed and accommodated in the case. Therefore, introduction of outside air or inside air is selectively performed at the rotational position of the rotary door. The intake box is attached to the main body portion so that the cylindrical direction of the cylindrical case is horizontal and is arranged laterally with respect to the vehicle.
[0006]
Even in such a new intake box, reduction of inflow resistance and noise during suction is an important issue. Especially when the inside air is introduced, not only cannot the noise be released to the outside as it is when the outside air is introduced, but also the air volume is increased in order to promote the reduction of the air volume. ) Increased).
[0007]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an intake box for a vehicle air conditioner that reduces not only the inflow resistance of the inflow air flow but also noise, in order to eliminate the above-mentioned disadvantages.
[0008]
[Means for Solving the Problems]
An intake box for a vehicle air conditioner according to the present invention has a blower and temperature adjusting means in an air conditioning case, and is disposed upstream of the blower of the vehicle air conditioner that blows out temperature-adjusted air into the vehicle interior. In an intake box for a vehicle air conditioner that selectively introduces air and inside air, the intake box includes a cylindrical case, a lid that closes one of the cylindrical case, and a rotary door that rotates in the cylindrical case. The cylindrical case is installed upstream of the air blower of the air conditioning case so that the cylindrical direction is horizontal and is directed to the lateral direction of the vehicle, and the rotary door has a rotating shaft and an arc-shaped control surface. And a boss supported by an arm stretched over the cylindrical case and the lid, which are rotatably supported by the rotating shaft, and also the cylindrical case. The internal air suction port and the external air suction port are formed on the wall, and the internal air suction port is close to the tongue portion at the beginning of scroll winding of the blower, whereas the external air suction port is It is formed at a position farther from the tongue than the inside air suction port, and the vehicle interior air flows along the cylindrical case from the opened inside air suction port, and is guided in the scroll winding angle direction through the blower through hole. as in that the (claim 1).
[0009]
As a result, the flow of the inside air guided to the scroll winding angle direction of the blower through the through hole formed by the bell mouth is minimized, and the flow resistance is rectified along the cylindrical surface while reducing the inflow resistance. In combination with the reduction of the inflow resistance, noise is reduced. Further, the inside air suction port is closer to the tongue than the outside air suction port, so that the inflow resistance is reduced and the noise is reduced.
[0013]
A plurality of arms supporting the boss of the rotary shaft stretched to the case of the rotary door, it is preferred that the cross-sectional shape of the arm is a blade shape or bullet shape as a shape that does not interfere with the flow of air introduced from the intake box (Claim 2).
Thereby, the reduction | decrease of the suction resistance of the air introduce | transduced into a fan and suppression of the deterioration of a noise can be aimed at.
[0014]
There boss of the rotary shaft of the rotary door in a plurality of arms supporting and stretched on the case, it is preferable that the angle between the arms of adjacent to the resonance of the noise is avoided in which the arm is generated unevenly (Claim 3). Thereby, resonance of noise generated by each arm can be prevented.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1 thru | or FIG. 3, the vertical installation vehicle air conditioner 1 mounted in the center console part of a vehicle is shown. The air conditioning unit 1 is arranged on the vehicle interior side of the fire board 7 that partitions the engine room and the vehicle interior, and the air blower 3, the evaporator 4, and the hot water heater 5 are arranged in the vehicle width direction in the air conditioning case 2. It is accommodated in the same position, and inside air and outside air are introduced into the air conditioning case 2 via an intake box 8 described below on the upstream side of the blower 3.
[0016]
In this example, the evaporator 4 is disposed below the blower 3 and the hot water heater 5 is disposed further downstream of the evaporator 4. The evaporator 4 and the hot water heater 5 are disposed so as to be shifted in the front-rear direction of the air conditioning case 2 in a state where they are erected, and the hot water heater 5 is disposed closer to the passenger compartment side of the air conditioning case 2 than the evaporator 4. The hot water heater 5 is provided so as to face the lower half of the evaporator 4, and the ratio of the air passing through and the air bypassing is adjusted by an air mix door 6 provided above the hot water heater 5. It has come to be.
[0017]
Further, on the downstream side of the air mix door 6, a center vent outlet 10, a defrost outlet 11, a side vent outlet 12, a foot outlet 13, and a rear foot outlet 14 for taking out temperature-controlled air are provided. .
[0018]
Here, the center vent outlet 10 is formed on both upper sides of the side facing the vehicle compartment side of the air conditioning case 2 so as to face the air conditioning passage 15 formed above the air mix door 6, and the defrost outlet 11 The side vent outlet 12 is formed at the upper part of the air conditioning case 2 located at the most downstream end of the air conditioning passage 15. The rear foot outlet 14 is formed at the lower portion of the side surface of the air conditioning case 2 facing the passenger compartment side, and the rear outlet is formed from the middle to the lower portion of the air conditioning case 2 along the side surface of the passenger compartment side. It communicates with a downstream portion of the air mix door 6 via a passage 16. Further, the foot outlets (not shown) are formed on the left and right side surfaces of the air conditioning case 2 so as to face the middle of the air conditioning passage 15.
[0019]
The opening of the center vent outlet 10, the defrost outlet 11 and the side vent outlet 12 is adjusted by differential vent doors 18 and 19 constituted by plate doors arranged above the air mix door 6, and the foot The opening of the outlet 13 is adjusted by a foot door 20 formed in a drum shape.
[0020]
Therefore, the air sent from the blower 3 is cooled when passing through the evaporator 4, and the ratio of the air flowing through the hot water heater 5 and the air flowing by bypass is determined according to the opening degree of the air mix door 6. After being adjusted and appropriately mixed on the downstream side of the air mix door 6, the air is blown out from the outlet that is opened in accordance with the blowing mode.
[0021]
The air conditioning case 2 has a lower case member 2a provided so as to place the evaporator 4, and an upper case 2b having a left and right vertically divided structure that is detachably attached to the upper portion of the lower case member 2a. The clip is attached to the fitting portion and coupled. In addition, 22 is piping connected to the entrance / exit part 5a of the warm water heater 5, and it is hold | maintained at the piping holding bracket 23 attached to the side surface which faces the engine room side of the air-conditioning case 2. FIG.
[0022]
The intake box 8 is shown in FIGS. 1, 4 to 4, and is a separate body independent of the air-conditioning case 2, and communicates with a through hole 25 that also has a bell mouth of the upper case 2 b, that is, the upper case 2 b. It is attached to the upper case 2b with screws or the like. Before describing the intake box 8, the related blower and the upper case 2b of the air conditioning case 2 in which the blower 3 is housed will be described.
[0023]
As described above, the blower 3 is intended to introduce inside air or outside air into the air conditioning case 2, and is arranged in the blower housing space 26 formed in the upper case 2 b of the air conditioning case 2. The blower employs a sirocco fan, which is a so-called centrifugal blower, and applies pressure to the air by the action of centrifugal force generated by the rotation of the blower. The blower storage space 26 is scrolled as shown in FIG. The tongue 28, which is shaped and starts to wind, is at the lowest position, and in the vicinity of the tongue 28, the distance from the blower (sirocco fan) is the shortest, and then the distance gradually increases. When the blower 3 rotates, the outside air or the inside air selected by the intake box 8 is sucked through the through hole 25 formed by the bell mouth.
[0024]
Returning to the description of the intake box 8, the intake box 8 includes a cylindrical case 30, a lid 31 that closes one of the cylindrical case 30, and a rotary door 32 that rotates inside the case 30. Reference numeral 32 denotes a rotating shaft 35 and an arc-shaped control surface 36. The rotating shaft 35 is supported by the boss 34 supported by the arm 33 stretched over the case 30 and the lid 31, and the rotation is performed. It is freely rotatable via a shaft 35.
[0025]
The cylindrical case 30 is formed with an outside air inlet 37 and an inside air inlet 38, the outside air inlet 37 extends so that outside air can be easily introduced, and the inside air inlet 38 is a tongue that is the start of scroll winding described above. In the vicinity of the portion 28. Therefore, the outside air suction port 37 is located farther from the tongue portion 28 than the inside air suction port 38. Although the above-described lid 31 is not shown, a rib mechanism and a thickness are appropriately formed to provide a damper mechanism and absorb noise.
[0026]
In such a configuration of the intake box 8, as shown in FIG. 4, when in the current position, the inside air suction port 38 is fully closed and the outside air suction port 37 is fully opened on the arc-shaped control surface 36, so that the outside air is opened. Sucked. When the rotary door 32 rotates clockwise, the inside air inlet 38 gradually opens and the outside air inlet 37 gradually closes. When the rotary door 32 rotates most clockwise, the outside air inlet 37 is fully closed. The inside air suction port 38 is fully opened.
[0027]
Then, the air in the passenger compartment flows as shown by the arrow (shown in FIG. 4) from the opened inside air suction port 38 and is sucked into the blower 3. That is, the flow of the inside air is guided in the scroll wrap angle direction and flows along the cylindrical surface of the case 30 of the blower, and is rectified, and the flow of the inside air can be minimized.
[0028]
5 to 7, four arms 33 are employed as creations related to the arms 33 that support the bosses 34. The angles θ ₁ , θ ₂ , and θ ₃ formed with the adjacent arms 33 are not uniform. It has become. As a result, resonance of noise generated by the arm 33 can be avoided.
[0029]
In addition, as shown in FIG. 6, the arm 33 is inclined (up to about 45 degrees) at an angle that follows the air flow direction (shown as an arrow) and has a guide function to reduce the airflow resistance. It is something to be made. In addition, the arm 33 is not only inclined (α degree), but the ventilation resistance can be further reduced by making the cross-sectional shape into a wing shape or a bullet shape as shown in FIG. Thus, it can contribute also to noise reduction from the reduction of ventilation resistance.
[0030]
【The invention's effect】
As described above, according to the present invention, a flow is generated in which the inside air sucked from the inside air suction port follows the case and is guided from the through hole formed in the bell mouth to the scroll winding angle direction of the blower. , and the the commutation at the cylindrical case, it is possible to reduce the Minara not a noise reduction of inflow resistance (claim 1).
[0031]
Since the inside air suction port is close to the tongue at the beginning of scrolling, the distance to the blower can be shortened, contributing to a reduction in inflow resistance and a reduction in noise ( claim 1 ).
[0032]
Then, the shape of the plurality of arms supporting the boss of the rotary shaft of the rotary door stretched to the case as a shape that does not interfere with the flow of intake air, blade shape, and bullet-shaped, the suction resistance of air drawn into the blower And the deterioration of noise can be suppressed ( claim 2 ).
[0033]
Further, in the above plurality of arms supporting the boss of the rotary door rotational axis stretched to the case, the angle between adjacent arms since it has unevenly, it is possible to prevent the resonance of the generated noise (claim 3 ).
[Brief description of the drawings]
FIG. 1 is a side view showing an intake box of a vehicle air conditioner according to the present invention mounted on an air conditioning case.
FIG. 2 is a longitudinal sectional view of the same as above.
FIG. 3 is a side view of the air-conditioning case when the intake box is removed from the air-conditioning case.
FIG. 4 is a longitudinal sectional view of an intake box.
FIG. 5 is a side view of the intake box.
FIG. 6 is a cross-sectional view of the intake box.
FIG. 7 is an explanatory diagram showing a cross-sectional shape of a rib.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Vehicle air conditioner 2 Air conditioning case 3 Blower 4 Evaporator 5 Hot water heater 6 Air mix door 7 Fire board 8 Intake box 10 Center vent outlet 11 Defrost outlet 12 Side vent outlet 13 Foot outlet 14 Rear foot outlet 26 Through hole Storage space 28 Tongue 30 Case 31 Lid 32 Rotary door 33 Arm 34 Boss 35 Rotating shaft 36 Arc control surface 37 Outside air inlet 38 Inside air inlet

Claims (3)

A vehicle air conditioner that has a blower and temperature adjusting means in an air conditioning case and is arranged upstream of the blower of a vehicle air conditioner that blows out temperature-controlled air into the vehicle interior, and selectively introduces outside air and inside air as appropriate. In the intake box of the device,
The intake box includes a cylindrical case, a lid that closes one of the cylindrical case, and a rotary door that rotates in the cylindrical case.
The cylindrical case is installed upstream of the air-conditioning case blower so that the cylindrical direction is horizontal and the vehicle is directed laterally,
The rotary door is composed of a rotating shaft and an arc-shaped control surface, and is supported rotatably by the rotating shaft by a boss supported by an arm stretched over the cylindrical case and the lid,
The cylindrical case is formed with an inside air inlet and an outside air inlet on the wall surface,
The inside air suction port is at a position near the tongue that is the start of scroll winding of the blower, whereas the outside air suction port is formed at a position farther from the tongue than the inside air suction port,
Intake of a vehicle air conditioner characterized in that vehicle interior air flows along a cylindrical case from an open inside air inlet and is guided in a scroll winding angle direction through a vent hole of a blower box. The plurality of arms that support the boss of the rotary shaft of the rotary door by stretching it over the case do not disturb the flow of air introduced from the intake box , and the cross-sectional shape of the arm is a wing shape or a bullet shape The intake box for a vehicle air conditioner according to claim 1, characterized in that: In the plurality of arms that support the boss of the rotary shaft of the rotary door across the case, angles between adjacent arms are made uneven so that resonance of noise generated by the arms is avoided. The intake box of the vehicle air conditioner according to claim 1 or 2 .

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