JP2018103802A - Air conditioner structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem in that a structure in which a passage from an intake box to a fan bends at a right angle may cause drift of air flow and generate noise.SOLUTION: An air conditioner structure is such that an intermediate connection part is disposed between an intake box and a blower fan and a suction port of the intake box is disposed at a right angle with respect to a passage extending from the intake box to an entrance of the blower fan. The air conditioner structure has an inclined face at an upstream side of the blower fan in the passage, the inclined face projecting toward a center axis side of the blower fan. As viewed from an axial direction of the blower fan, the inclined face includes a nose-side end of an exhaust port of the blower fan. The air conditioner structure eliminates occurrence of noise by controlling air flow that may cause noise.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an air conditioner used in an automobile, and particularly to reduce abnormal noise generated by the air conditioner.

  Automobiles are often exposed to an environment where the outside air temperature changes drastically. Therefore, in order to improve the comfort in the vehicle, it is necessary to maintain the vehicle interior at a comfortable temperature. There is also a need to quickly bring the room temperature to the specified temperature. Therefore, an automotive air conditioner has a cooling source and a heat source, and mixes the cooled air and the heated air to quickly create air having a set temperature.

  An air conditioner for an automobile that realizes such a demand includes a heat exchanger for cooling, a heat exchanger for heating, an air mixing chamber that mixes cold air and hot air that can be obtained therefrom, and an air passage that sends air to various parts in the vehicle Are formed in a compact form. Therefore, there is a portion where the air passage is formed at a right angle or an acute angle.

  In such places, the air flow is disturbed and pressure loss occurs. There may also be abnormal noise. In Patent Document 1, there is provided a vehicle air conditioning unit that reduces the air resistance generated because the passage from the intake box of the air conditioner to the blower fan is bent at a right angle, thereby reducing the air resistance and increasing the noise. It is disclosed.

  Patent Document 1 discloses a configuration in which a bell mouth is disposed between an intake box that takes in outside air and inside air and a blower fan that sends the taken-in air to a heat exchanger.

JP 2014-240251 A

  If the ventilation path from the intake box to the fan is bent at a right angle, a drift occurs in the air flow, which causes an increase in noise. In addition, air flow resistance increases and power consumption also increases.

  In Patent Document 1, in order to reduce this air drift, a bell mouth is arranged between the intake box and the scroll portion where the blower fan is arranged. However, when the intermediate connecting portion is arranged between the intake box and the scroll portion and a certain distance is provided, the diameter of the intermediate connecting portion and the diameter of the scroll portion are the same. Can not.

  The present invention has been conceived in view of the above-described problems. The noise reduction of an air conditioner having an intermediate connecting portion having the same diameter as the inlet diameter of the scroll portion between the intake box and the scroll portion, and the power consumption of the blower fan. An air conditioner structure that realizes reduction is provided.

More specifically, the air conditioner structure according to the present invention is:
An intermediate connecting part is arranged between the intake box and the blower fan,
An air conditioner structure in which the intake port of the intake box is arranged at a right angle with respect to the passage from the intake box to the blower fan inlet,
On the upstream side of the blower fan in the passage, has an inclined surface protruding toward the blower fan central axis side,
The inclined surface includes a nose side end portion of an outlet of the blower fan when viewed from the axial direction of the blower fan.

  In the air conditioner structure according to the present invention, the inclined surface disposed in the passage from the intake box inlet to the blower fan eliminates the unevenness of the air on the outlet side, and can reduce noise caused by collision with the backflow air.

  Moreover, since the protrusion of the inclined surface is a part, the pressure loss due to the reduction of the cross-sectional area hardly affects the power consumption.

It is a figure which shows the air-conditioner structure which concerns on this invention. FIG. 2 is a partially enlarged view of FIG. 1. It is a figure which shows the flow of the air in the conventional air conditioner structure. It is a figure which shows the flow of the air in the air-conditioner structure of this invention.

  Hereinafter, an air conditioner structure according to the present invention will be described with reference to the drawings. The following description exemplifies an embodiment of the present invention, and the present invention is not limited to the following description. Accordingly, the following description can be modified without departing from the spirit of the present invention.

  FIG. 1 shows a cross-sectional view (FIG. 1 (a)) and a side see-through view (FIG. 1 (b)) of an air conditioner structure 1 according to the present invention. The air conditioner structure 1 includes an air blowing unit 12 including an intake box 10 and a blower fan 20, a heat exchanging unit 13 that receives air from the air blowing unit 12, and an intermediate connection unit 14 that connects the intake box 10 and the air blowing unit 12. In addition, the motor which rotates the blower fan 20 is abbreviate | omitting description.

  The intake box 10 has an air inlet 10i opened on the upper surface side. A switching plate 9 is disposed on the upper side of the intake port 10i, and switches between taking in outside air and inside air. One side surface of the intake box 10 is open.

  An intermediate connecting portion 14 is connected to the side opening (exit 10 o) of the intake box 10. The intermediate connecting portion 14 is a cylindrical member having a cylindrical cross section. The end on the side where the intermediate connecting portion 14 is connected to the intake box 10 is referred to as one end 14 a of the intermediate connecting portion 14. The opposite end is called the other end 14b. The central axis of the intermediate connecting portion 14 is referred to as a central axis 14c.

  The intermediate connection part 14 is a cylindrical member whose inner wall is cylindrical. A part of the ventilation path from the outlet (10o) of the intake box 10 to the blower 12 (inlet 20i of the blower fan 20) is formed, and the air flow is rectified.

  The blower unit 12 is connected to the other end 14 b of the intermediate connection unit 14. The blower unit 12 includes a blower fan 20 and a motor (not shown) that rotates the blower fan 20. Therefore, the other end 14 b of the intermediate connecting portion 14 is connected to the inlet 20 i of the blower fan 20. The inlet 20i of the blower fan 20 may be said to be the inlet of the blower unit 12. The air outlet of the blower 12 is a discharge port 20o.

  The heat exchanging unit 13 is a device that generates hot air and cold air such as a cooling heat exchanger 22, a heating heat exchanger 24, an air mix door 26, and an air mixing chamber 28, and doors at various locations that control air passages. It is comprised (refer FIG.1 (b)).

  Referring to FIG. 1B, the blower fan 20 is provided with a discharge port 20 o that sends air to the heat exchange unit 13. The tip of the discharge port 20o is called a nose 20on.

  In the air conditioner structure having the above configuration, the intake port 10i of the intake box 10 is disposed at a right angle with respect to the ventilation path from the intake box 10 to the blower fan 20.

  In the air conditioner structure 1 according to the present invention, an inclined portion 16 is formed in the intermediate connecting portion 14. The inclined portion 16 is formed with an inclined surface 16 s that rises from the intake box 10 toward the blower portion 12. The height of the inclined surface 16s is 16L. The inclination angle θ of the inclined surface 16s is preferably 30 degrees or more and 60 degrees or less. This is because if the angle is shallow, there is little influence on the airflow, and if the angle is too large, the air resistance becomes too large.

  FIG. 2 shows a partially enlarged view of FIG. When the blower fan 20 and the motor that rotates the blower fan 20 are removed, the inclined portion 16 can be seen from the direction A in FIG. The inclined portion 16 has an outer arc 16dr and an inner arc 16ur centered on a central axis 14c of the intermediate connecting portion 14 (see FIG. 1A) along the cylindrical inner wall surface 14i of the intermediate connecting portion 14. It is formed in a fan shape. Here, the outer arc 16dr is connected to the inner wall surface 14i of the intermediate connecting portion 14. The fan-shaped diameter is a height 16L of the inclined portion 16.

  As will be described later, the inclined portion 16 according to the present invention is expected to have an effect of preventing the airflow from the intake box 10 from colliding with the airflow flowing backward at the outlet 20o of the blower fan 20. Therefore, it is necessary not to be formed at an arbitrary location on the inner wall surface 14i of the intermediate connecting portion 14, but to be provided at a location where the flow toward the outlet 20o of the blower fan 20 is changed.

  Therefore, it is preferable to form such a positional relationship that the outer arc 16dr includes at least the nose 20on side end of the outlet 20o of the blower fan 20. This is because a reverse flow is generated at the nose 20 on, so that the portion is avoided by the inclined portion 16. In addition, if the inclined portion 16 is too large, only the air resistance of the airflow flowing through the blower portion 12 becomes air resistance, so the size needs to be limited.

  As a result of investigation by the inventors of the present invention, the central angle φ of the fan shape is 60 degrees or more and 90 degrees or less, and the fan-shaped diameter (height of the inclined portion 16) 16L is relative to the radius of the inner diameter of the intermediate connecting portion 14. The range of 50% or more and 70% or less was suitable.

  The operation of the air conditioner structure having the above configuration will be described. FIG. 3 shows the structure of the air conditioner when there is no inclined portion 16. The air sent from the intake box 10 bends the air path 90 degrees toward the blower fan 20. Accordingly, a large amount of airflow flows under the intake box 10 and the intermediate connecting portion 14, and the pressure in this portion increases.

  On the other hand, the blower fan 20 changes the flow of the air sent from the outlet 20o to the heat exchanger 13 below, so that the pressure increases near the outlet 20o of the blower fan 20 and can enter the heat exchanger 13. In addition, a flow fv that flows backward from the nose 20on to the intermediate connecting portion 14 is also generated.

  The reverse flow fv and the flow f1 from the intake box 10 collide with each other in the region B, whereby abnormal noise is generated from the air conditioner.

  FIG. 4 shows the air flow when the intermediate connecting portion 14 according to the present invention is provided. The airflow from the intake box 10 passes under the intake box 10 and the intermediate connecting portion 14 in the same manner as in FIG. 3, but in FIG. 4, the inclined portion 16 is disposed in the intermediate connecting portion 14. Therefore, the flow f1 of the lower airflow in the passage is lifted by the inclined portion 16 and directed toward the rotation axis of the blower fan 20.

  Then, the airflow flow f1 from the intake box 10 does not directly collide with the airflow flow fv flowing backward from the outlet 20o of the blower fan 20. Thereby, it is possible to suppress the generation of abnormal noise.

  The inclined portion 16 has an air resistance against the airflow from the intake box 10 and turbulence is generated on the blower fan 20 side of the inclined portion 16. However, by setting the shape of the inclined portion 16 in the above range, it is possible to prevent a pressure loss that has a great influence on the flow of air sucked by the air conditioner.

  As described above, the air conditioner structure 1 according to the present invention is provided with the inclined surface 16 s in the intermediate connecting portion 14 between the intake box 10 and the air blowing portion 12, and therefore, from the nose 20 on portion of the outlet 20 o of the blower fan 20. Since it is possible to prevent the air flowing from the intake box 10 from colliding with the air that flows backward, the generation of abnormal noise is suppressed, and the power consumption of the motor that drives the blower fan 20 can also be reduced.

  The present invention can be suitably used for an air conditioner of an automobile.

DESCRIPTION OF SYMBOLS 1 Air-conditioner structure 9 Switching board 10 Intake box 10i Inlet 10o Outlet 12 Blower 13 Heat exchange part 14 Intermediate connection part 14a One end 14b Other end 14c Center axis 14i Inner wall surface 16 Inclined part 16s Inclined surface 16L Height θ Inclined angle 16c Center 16dr Outer arc 16ur Inner arc 20 Blower fan 20i (Blower fan) Inlet 20o Outlet 20on Nose 22 Cooling heat exchanger 24 Heating heat exchanger 26 Air mix door 28 Air mixing chamber φ Center angle f1 Flow fv Flow B region

Claims (1)

An intermediate connecting part is arranged between the intake box and the blower fan,
An air conditioner structure in which the intake port of the intake box is arranged at a right angle with respect to the passage from the intake box to the blower fan inlet,
On the upstream side of the blower fan in the passage, has an inclined surface protruding toward the blower fan central axis side,
The air conditioner structure according to claim 1, wherein the inclined surface includes a nose side end portion of a discharge port of the blower fan when viewed from an axial direction of the blower fan.