KR20060117012A - Blower unit for air conditioning system of a car - Google Patents

Abstract

A blowing apparatus for an air conditioner of a vehicle is provided to disperse noise concentrated at a predetermined frequency by generating irregular vortex by an inlet protrusion when air is introduced from the upper side. A blowing apparatus for an air conditioner of a vehicle includes an air intake case, a scroll case, and an inlet ring(40). The inlet ring is interposed between the air intake case and the scroll case. A bell mouth is formed in the inlet ring so as to communicate an introduction chamber and a blower chamber. An inlet protrusion(43) is formed at a predetermined position on the inner side of the inlet ring so as to disperse noise concentrated at a predetermined frequency when air is introduced from the upper side.

Description

Blower Unit for Air Conditioning System of a Car}

1 is a schematic side cross-sectional view of a blower for a vehicle air conditioner according to the prior art.

Figure 2 is a schematic side cross-sectional view showing the structure of an inlet ring according to an example of the prior art.

Figure 3 is a graph showing the noise of the blower stage and the frequency band according to the prior art.

Figure 4 is a schematic partial cross-sectional view showing a state in which the inlet protrusion of the inlet ring according to the present invention is arranged in various embodiments.

5 is a graph showing the number of blowers and frequency band according to the present invention.

*** Explanation of symbols for main parts of drawing ***

10: Air Intake Case,

15: inlet chamber,

20: scroll case,

22: blower room,

30: blower fan,

40: inlet ring,

41: Bell Mouth,

43: inlet protrusion.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blower for an automotive air conditioner, and more particularly, by forming an inlet protrusion at a predetermined position inside the inlet ring, to generate an irregular vortex when air is introduced from the upper part to a specific frequency (Hz) band. The present invention relates to a blower for an automotive air conditioner that can disperse concentrated noise and improve whistle efficiency by reducing whistle noise.

In general, a vehicle air conditioner is a device that cools or heats the air through a heat exchanger by introducing indoor and outdoor air of a vehicle, and then cools or heats the interior of the vehicle by blowing it to the interior of the vehicle. An air blower is essentially provided to blow air into the vehicle interior by introducing air from indoors or outdoors.

A blower for a vehicle air conditioner according to the prior art, as shown in Figures 1 and 2, having an internal and external air conversion door 13 for selectively opening and closing the internal and external air inlet (11, 12) inlet chamber 15 Air intake case (10) is formed; A scroll case (20) installed at a lower portion of the air intake case (10) and having a blowing chamber (22) formed therein so as to be rotatably disposed therein; An inlet ring (40) formed with a bell mouth (41) interposed between the air intake case (10) and the scroll case (20) to communicate the inflow chamber (15) with the blower chamber (22). And the like.

The internal and external air conversion door 13 has a flat plate-like structure, and at both ends thereof, rotary shafts 14 are inserted into shaft holes respectively formed at both sides of the air intake case 10 and protrude out of the shaft holes. have. The rotary shaft 14 is configured to rotate in association with an operation of a blowing mode selection switch (not shown) of an air conditioning controller installed on a center fascia located in front of a vehicle interior.

Among the components, the inlet ring 40 is formed in an annular shape having a bell mouse 41 in communication therewith, and is provided to guide the smooth inflow of air from the inlet chamber 15 into the blower chamber 22, and the blower It is formed so that air introduced into the chamber 22 does not flow back into the inlet chamber 15.

In addition, the blower fan 30 may include a hub plate 33 coupled to the motor shaft 32, and a plurality of blades 34 arranged along an upper edge of the hub plate 33. And it consists of a support ring 35 for supporting the free ends of the blades 34 and the like is rotatably disposed in the scroll case (20). The hub plate 33 is formed in a concave shape toward the upper portion of the space formed by the blades (34).

In such a structure, when the blower fan 30 is rotated by the driving of the motor 31, the air inlet 11 and the outside air inlet 12 are selectively opened by the rotation of the internal and external air switching doors 13. Air introduced into the inlet chamber 15 through the bell mouth 41 formed in the inlet ring 40 flows into the blowing chamber 22 of the scroll case 20, and then rotates the blowing fan 30. The air flows in the air conditioner case (not shown) through the discharge port while increasing the air pressure and the air volume along the side wall of the scroll case 20 while radially flowing by.

However, in the blower, when the air flowing from the upper side flows, the flow resistance is increased and a high static pressure is applied, thereby causing a backflow phenomenon in the vicinity of cut-off in the scroll case 20. Due to mutual interference with the blowing air of the blower fan 30, low-frequency rumble noise and whistle noise of 1000 Hz or more are generated between about 25 Hz and 400 Hz.

In addition, due to the unstable flow of air due to the discontinuous rotation of the specific system and the motor 31, a resonance sound is made to ring the inside of the blower, and thus a frequency that reacts resonantly with the resonance sound is agglomerated in the ring of the inlet ring 40. It will rise through the bell mouse 41.

As shown in Fig. 3, when the frequency of the blower is expressed as an ellipse at approximately 1500 Hz, when the line drawn parallel to the X axis from the Y axis is C, the blower stage that meets C is It can be seen that the noise of the peak value (Peak) is about 40 dB, and the blower shear number peak value of the same frequency band rises rapidly.

That is, when air flows through the inlet ring 40 in the blower chamber 22, a high level of whistle noise is continuously generated in the blower shear water at a specific frequency, thereby degrading sound quality and lowering the blowing efficiency. there was.

The present invention has been made to solve the above problems, by forming an inlet protrusion at a predetermined position inside the inlet ring, to generate an irregular vortex when the air flows from the top to reduce the noise concentrated in a specific frequency (Hz) The purpose is to improve the blowing efficiency by dispersing and reducing whistle noise.

According to the blower for the vehicle air conditioner of the present invention devised to achieve the object as described above, an air intake case having an inlet and outboard air conversion door for selectively opening and closing the internal and external air inlet Wow; A scroll case installed at a lower portion of the air intake case and having a blowing chamber rotatably disposed therein; A blower for an automotive air conditioner including an inlet ring interposed between the air intake case and the scroll case, the bell mouth being formed so as to communicate the inflow chamber and the blowing chamber, wherein the inside of the inlet ring Inlet protrusions are formed to disperse the noise concentrated at a specific frequency when air is introduced from the upper portion at a predetermined position.

In addition, the inlet protrusion is characterized in that the cross section is formed in a polygonal shape of at least a triangle or more.

In addition, the inlet protrusion, characterized in that the inlet ring is formed in a range that does not fall at least 5mm or more from the horizontally extending portion to the rear when the upper portion of the inlet (inlet) to form a curved surface extending upward.

In addition, the inlet protrusion, characterized in that the height of the surface hitting the air flowing from the top is formed 0.5mm or more.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 is a schematic partial cross-sectional view showing a state where the inlet protrusion of the inlet ring according to the present invention is arranged in various embodiments, and FIG. 5 is a graph of the number of blower stages showing the noise with respect to the frequency band according to the present invention.

In the blower for the vehicle air conditioner according to the present invention, the air intake case 10 and the air intake case 10 is formed having an internal and external air conversion door 13 for selectively opening and closing the internal and external air inlet (11, 12) and ; A scroll case 20 installed below the air intake case 10 and having a blowing fan 22 rotatably disposed therein and having a blowing chamber 22 formed therein; Since the inlet ring 40 interposed between the air intake case 10 and the scroll case 20 and the bell mouth 41 is formed to communicate the inflow chamber 15 and the blower chamber 22 is the same as the prior art. In the following description, the same components as in the prior art will be denoted by the same reference numerals, and redundant description thereof will be omitted.

As shown in FIG. 4, an inlet protrusion 43 is formed at an inner predetermined position of the inlet ring 40.

It is preferable that the inlet protrusion 43 is formed in a polygonal shape having a cross section of at least a triangle or more and 0.5 mm or more on a surface which collides with the air flowing from the top.

In addition, the inlet protrusion 43 extends horizontally to the rear when the shape of the inlet ring 40 extends upward from the end of the inlet, as shown in FIGS. 4A to 4D. It is preferable that it is formed in the range which does not fall at least 5 mm or more from the part S to become. That is, by forming an inlet protrusion 43 having an irregular cross section as close as possible from the inlet inside the inlet ring 40, the inlet protrusion 43 on the flow path is brought into contact with each other to generate an irregular vortex and flow. Disturbances occur, and noise concentrating at specific frequencies is dispersed to reduce whistle noise.

As shown in Fig. 5, when the frequency of the blower is expressed as an ellipse at approximately 1500 Hz, when the line drawn parallel to the X axis from the Y axis is C, the number of blowers that meet C is It can be seen that the peak noise of the peak frequency (Peak) of about 35dB is about 35dB, so that the number of blower shears in the same frequency band is reduced as compared with the related art.

Accordingly, when air is introduced into the blower chamber 22 through the inlet ring 40, a high level of whistle noise can be prevented from continuously occurring in the blower shear water at a specific frequency.

Although the preferred embodiments of the present invention have been described above, the scope of the present invention is not limited to such specific embodiments, and those skilled in the art may appropriately change within the scope described in the claims of the present invention. This will be possible.

As described above, according to the blower for an automotive air conditioner according to the present invention, by forming an inlet protrusion at a predetermined position inside the inlet ring, an irregular vortex is generated when air is introduced from the upper part to a specific frequency (Hz) band. Disperses the concentrated noise and reduces the whistle noise, thereby improving the blowing efficiency.

Claims (4)

An air intake case 10 having internal and external air conversion doors 13 for selectively opening and closing the internal and external air inlets 11 and 12 and having an inlet chamber 15 therein; A scroll case (20) installed below the air intake case (10) and having an air blowing chamber (22) rotatably disposed therein to form a blowing chamber (22); An inlet ring (40) formed with a bell mouth (41) interposed between the air intake case (10) and the scroll case (20) to communicate the inflow chamber (15) with the blower chamber (22). In the air blower for a vehicle air conditioner comprising: Blower device for an automotive air conditioner, characterized in that the inlet protrusions (43) is formed so that the noise concentrated at a specific frequency when air is introduced from the upper portion in the predetermined position of the inlet ring (40). The method of claim 1, The inlet protrusion 43 is a blower for an automotive air conditioner, characterized in that the cross section is formed in a polygonal shape of at least a triangle or more. The method according to claim 1 or 2, The inlet protrusion 43 is formed in a range that does not fall at least 5 mm from the horizontally extending portion rearward when the shape of the inlet ring 40 extends to form a curved surface at the end of the inlet (Inlet) Blower device for an automotive air conditioning apparatus. The method of claim 3, wherein The inlet protrusion 43 is a blower for an automotive air conditioner, characterized in that the height of the surface hitting the air flowing from the top is formed 0.5mm or more.

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