KR20140007579A - Intake system of air conditioner for a vehicle - Google Patents

Abstract

The present invention includes an air intake case having an inlet and outboard air conversion door for selectively opening and closing the inside and outside air inlets; A scroll case installed at a lower portion of the air intake case and having a blower chamber rotatably disposed therein; A circular bell mouse provided inside the air intake case to communicate the inflow chamber and the blower chamber; A guide part protruding horizontally inwardly of the bell mouse at an end of a circumferential surface of the bell mouse; And at least one rib formed at one end of the guide unit to be bent to reduce noise generated when the outside air flows into the bell mouse.
Therefore, a guide portion protruding horizontally inwardly of the bell mouse and a rib formed to be bent at one end of the guide part are formed at the end of the circumferential surface of the bell mouse so that the outside air is rapidly introduced into the bell mouse by the rib bent upwardly. The noise generated can be reduced. In addition, it is possible to reduce the noise generated when the outside air introduced into the bell mouse by the rib bent downward flows out of the reverse flow.

Description

Intake system for air conditioner of vehicle {Intake system of air conditioner for a vehicle}

The present invention relates to an intake system for an air conditioner of a vehicle, and more particularly, to an intake system for an air conditioner of a vehicle, which can prevent noise generated when external air flows into the vehicle air conditioner.

Referring to the prior art described in Korean Patent Laid-Open Publication No. 2006-0117012, generally, an air conditioner of a vehicle introduces indoor / outdoor air of a vehicle and cools or heats the air through heat exchange, and then supplies it to the interior of the vehicle. A device that cools or heats a vehicle interior. Such an air conditioner is essentially provided with a blower device for introducing air from inside or outside the vehicle.

The vehicle blower device according to the prior art, as shown in Figs. 1 and 2, the air having the inlet chamber 15 is formed having an internal and outdoor air conversion door 13 for selectively opening and closing the internal / outdoor air inlets (11, 12) An air take case 10; A scroll case (20) installed below the air intake case (10) and having a blower chamber (22) formed by rotatable blower fan (30) therein; An inlet ring 40 having a bell mouth 41 interposed between the air intake case 10 and the scroll case 20 to communicate the inflow chamber 15 and the blower chamber 22 with each other. It is made, including.

The internal and external air conversion doors 13 have a flat plate-like structure, and upper and lower ends of the inner and outer air conversion doors 13 are inserted into shaft holes respectively formed at both sides of the air intake case 10 to protrude outside the shaft holes. . The rotary shaft 14 is configured to rotate in conjunction with a blower 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 with the inside, and is provided to guide the smooth inflow of air from the inlet chamber 15 into the blower chamber 22, and the blower chamber It is formed so that the air introduced into the 22 does not flow back into the inflow chamber 15.

In addition, the blower fan 30 may include a hub plate 33 coupled to the motor shaft 32, 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 is disposed rotatably in the stroke case (20). The hub plate 33 is formed in a concave shape toward the upper portion of the space formed by the blades (34).

When the blower fan 30 is rotated by the driving of the motor 31 in such a structure, 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 flows into the blower chamber 22 of the scroll case 20 through the bell mouth 41 formed in the inlet ring 40. Thereafter, the air is blown into the air conditioner case (not shown) through the discharge port while the air pressure and the air flow are verified along the side wall of the scroll case 20 while radially flowing by the rotation of the blower fan 30.

However, in the blower device, when the air flowing from the upper side flows, the flow resistance is increased, so that a high static pressure is applied, thereby causing a backflow phenomenon near the cut off in the scroll case 20. Due to the mutual interference between the backflow air and the blowing air of the blower fan 30, there is a problem that whistle noise is generated at about 2000 Hz or more.

In addition, due to the unstable flow of air due to the discontinuous rotation of the specific system and the motor 21, a resonance sound is made to ring the inside of the blower device, and thus the frequency that reacts sensitively with the resonance sound is agglomerated in the ring of inlet ring 40. There was a problem that rises through the bell mouse (41).

The present invention has been made to solve the above problems, and provided with a guide portion protruding horizontally inwardly on the bell mouse, and formed by forming a rib to bend at one end of the guide portion occurs while the outside air flows into the air conditioning apparatus It is an object of the present invention to provide an intake system for an air conditioner of a vehicle that can effectively reduce noise.

According to the present invention for achieving the above object, an air intake casing (Intake Casing) having an inlet and outboard air conversion door for selectively opening and closing the inside and outside air inlet; A scroll case installed at a lower portion of the air intake case and having a blower chamber rotatably disposed therein; A circular bell mouse provided inside the air intake case to communicate the inflow chamber and the blower chamber; A guide part protruding horizontally inwardly of the bell mouse at an end of a circumferential surface of the bell mouse; And a rib bent at one end of the guide part to be configured to reduce noise generated when the outside air flows into the bell mouse.

In the intake system for an air conditioner of the vehicle, the protrusion length X of the guide part may satisfy Equation 1 below.

Equation 1

3a ≦ X ≦ 7a, where a denotes the separation distance between the inner surface of the bell mouse until the projection along the upper surface of the shroud.

In the intake system for an air conditioner of the vehicle, the rib may be bent up or down at one end of the guide part, and the rib may be bent up and down at one end of the guide part.

The bent length Y of the rib may satisfy Equation 2 below.

Equation 2

0.5X ≦ Y ≦ 2X, where X represents the protruding length of the guide portion protruding inward from the circumferential end of the bell mouse.

In the intake system for an air conditioner of the vehicle, an installation range of the guide unit may be installed within 280 ° from one end of the inlet of the blower chamber provided under the bell mouse to the other end of the inlet, and protrudes from the guide unit. The angle may be -40 ° to 40 ° based on the center of the bell mouse within the installation range of the guide portion.

According to the intake system for an air conditioner of a vehicle according to the present invention, a guide portion protruding horizontally inward of the bell mouse and a rib formed at one end of the guide portion are bent upwardly at the end of the peripheral surface of the bell mouse. It is possible to reduce the noise generated when the outside air is rapidly introduced into the bell mouse by the ribs, and to reduce the noise generated when the outside air introduced into the bell mouse by the ribs bent downward flows out of the back flow. .

1 is a schematic side cross-sectional view of a blower device for an air conditioner of a vehicle according to the prior art.
Figure 2 is a schematic side cross-sectional view showing an inlet ring structure according to an example of the prior art.
3 is a graph showing a generation area of noise in the bell mouse according to the prior art.
4 is a diagram schematically illustrating an intake system for an air conditioner of a vehicle according to an exemplary embodiment of the present disclosure.
FIG. 5 is a perspective view illustrating the scroll guide shown in FIG. 4.
6A to 6C are views illustrating ribs protruding or integrally protruding from the guide part of the bell mouse shown in FIG.
FIG. 7 is a view illustrating a state in which the ribs illustrated in FIGS. 6A to 6C prevent external air from flowing rapidly into or out of the bell mouse.
8 is a view illustrating a range in which the guide portion and the rib are installed in the bell mouse.
9 is a graph showing a state in which noise is reduced by installing a guide part and a rib in the bell mouse.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately The present invention should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention.

4 is a view schematically showing an intake system for an air conditioner of a vehicle according to an embodiment of the present invention, FIG. 5 is a perspective view showing a scroll guide shown in FIG. 4, and FIGS. 6A to 6C are shown in FIG. 4. Figure 7 is a view showing a state in which the ribs projecting or integrally protruding the upper and lower portions of the bell mouse, the ribs shown in Figure 6a to 6c is a rapid external air flow into the bell mouse or 8 is a view illustrating a state in which the flow is prevented from flowing backward, FIG. 8 is a view illustrating a range in which the guide part and the rib are installed in the bell mouse, and FIG. 9 is a view in which the noise is reduced due to the guide part and the rib installed in the bell mouse. The graph shown.

4 to 9, an intake system for an air conditioner of a vehicle according to an exemplary embodiment of the present invention includes an air intake case 100, a scroll case 200, and a bell mouse. (Ballmouth; 300), the guide portion 400, and the rib 500 is included.

The air intake case 100 includes an internal air inlet 110, an external air inlet 120, and internal and external air conversion doors 130, and an inlet chamber 140 is formed. The internal and external air conversion door 130 serves to selectively open and close the internal air inlet 110 and the external air inlet 120. Since the internal and external air conversion doors 130 are selectively opened and closed, external air introduced through the internal air inlet 110 and the external air inlet 120 is supplied to the inlet chamber 140.

The internal and external air conversion door 130 has a flat plate-like structure, and is inserted into shaft holes (not shown) formed at both sides of the air intake case 100 at upper ends of the internal and external air conversion doors 130, respectively. Not shown) is formed with a rotating shaft 150 protruding outward. The rotation shaft 150 rotates in association with a blower mode selection switch (not shown) of an air conditioning controller installed on a center fascia located in front of a vehicle interior.

A scroll case 200 is installed below the air intake case 100. The blower fan 210 is rotatably disposed in the scroll case 200 to form the blower chamber 220.

The blower fan 210 has a hub plate 216 coupled to the motor shaft 214 of the motor 212, and a plurality of blades 218 arranged along the top edge of the hub plate 216. ) Is rotatably installed in the scroll case 200.

A circular bell mouse 300 is provided inside the air intake case 100. The bell mouse 300 communicates the inflow chamber 140 of the air intake case 100 with the blower chamber 220 of the scroll case 200, and the bell mouse 300 has external air in the inflow chamber. It serves to guide the smooth flow into the blower chamber 220 in 140, the separation distance between the inner surface of the bell mouse 300 to the projection (600a) along the upper surface of the shroud (600) Prevent backflow through a).

A guide part 400 is provided at an end of a circumferential surface of the circular bell mouse 300. The guide part 400 is provided to protrude horizontally to the inside of the bell mouse 300 at the end of the bell mouse 300, the guide part 400 is the air introduced into the blower chamber 220 It serves to prevent backflow into the inlet chamber 140.

Referring to FIG. 7, the protrusion length X from which the guide part 400 protrudes from the bell mouse 300 preferably satisfies Equation 1 below.

[Equation 1]

3a ≤ X ≤ 7a

Here, a represents a separation distance between the inner surface of the bell mouse 300 and the projection 600a along the upper surface of the shroud 6000.

When the protruding length X of the guide part 400 is smaller than three times the separation distance a between the blower fan 210 and the bell mouse 300, the air introduced into the blower chamber 210 is reduced. It is impossible to prevent backflow into the inflow chamber 140.

In addition, when the protruding length (X) of the guide unit 400 is greater than 7 times the separation distance (a) of the blower fan 210 and the bell mouse 300, flows into the blower chamber 210 The effect of preventing air from flowing back into the inflow chamber 140 is good, but noise may be generated while the guide unit 400 vibrates due to backflowing air, or the guide unit 400 may be damaged. Because.

One end of the guide unit 400 is formed to be bent rib 500 to reduce the noise generated when the outside air flows into the bell mouse (300). 6A to 6C, the rib 500 may be formed to be bent upwards or downwards at one end of the guide part 400, and may be bent upwardly and downwardly at one end of the guide part 400. Can be formed.

The rib 500 is formed to be bent to the upper portion of the guide portion 400 serves to prevent the external air is rapidly introduced into the bell mouse 300, and to be bent to the lower portion of the guide portion 400 The rib 500 formed serves to prevent backflow of air introduced into the blower chamber 220 to the inflow chamber 140 in the same manner as the guide unit 400.

Referring to FIG. 7, the bent length Y of the rib 500 formed to be bent up and down at one end of the guide part 400 may satisfy Equation 2 below.

&Quot; (2) "

0.5X ≤ Y ≤ 2X

Herein, X represents the protruding length of the guide portion 400 protruding inwardly from the circumferential end of the bell mouse 300.

The bent length Y of the rib 500 bent upward and downward at one end of the guide part 400 protrudes inward from the circumferential end of the bell mouse 300 to the inside. When it is smaller than 1/2 of the length (X), it is possible to prevent the external air that is rapidly introduced into the bell mouse 300, the air introduced into the blower chamber 220 flows back to the inlet chamber 140 It cannot be prevented.

In addition, the bent length (Y) of the rib 500, which is bent up and down at one end of the guide part 400, the guide part 400 protruding inwardly from the end of the circumferential surface of the bell mouse 300 When greater than two times the protruding length (X) of the by the outside air that is rapidly introduced into the bell mouse 300 and the air flows into the blower chamber 220 and then back to the inlet chamber 140 by This is because noise is generated while the rib 500 vibrates, or the rib 500 is broken.

Referring to FIG. 8, an installation range of the guide part 400 formed to be bent at one end of the rib 500 is an inlet end (b) of the blower chamber 220 provided below the bell mouse 300. It is preferred to be installed within 280 ° starting from and to the other end of the inlet (c).

When the inlet end b of the blower chamber 220 is 0 °, the other end c of the inlet of the blower chamber 220 is 280 °, and the guide part is formed such that the rib 500 is bent at one end. The purpose of the 400 to be installed within 0 ° ~ 280 ° is the amount of air introduced into the bell mouse 300 within 0 ° ~ 280 ° and the air introduced into the blower chamber 220 is the inlet chamber 140 This is because the amount of backflow is large.

The protrusion angle of the guide part 400 formed to be bent at the rib 500 is -40 ° to 40 ° based on the center of the bell mouse 300 within the installation range of the guide part 400. The eggplant is preferably within 80 degrees. This is because when the protrusion angle of the guide part 400 formed to be bent at the rib 500 exceeds 80 °, the amount of air introduced into the bell mouse 300 is reduced.

The air flowing from the outside is blown into the air conditioner as follows. When the blower fan 210 is rotated by the driving of the motor 212, the inlet chamber 110 is opened through the internal air inlet 110 and the external air inlet 120 that are selectively opened by the rotation of the internal and external air conversion doors 130. 140 is introduced into the blower chamber 220 of the scroll case 200 through the bell mouse 300 having the guide portion 400 and the ribs 500 formed therein, and then the rotation of the blower fan 210. As a result of the flow in the radial direction along the side wall of the scroll case 200 is blown into the air conditioner (not shown) through the discharge port (not shown) while the air pressure and the air volume is increased.

Therefore, a guide portion 400 protruding horizontally inwardly of the bell mouse 300 and ribs 500 bent at one end of the guide portion 400 are formed at the end of the circumferential surface of the bell mouse 300. By the rib 500 is bent to the outside air is rapidly introduced into the bell mouse 300 can reduce the noise generated. In addition, the noise generated when the external air introduced into the bell mouse 300 by the rib 500 bent downward flows out by flowing back.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

100: air intake case 110: bet inlet
120: outside air inlet 130: internal and external air conversion door
140: inflow chamber 200: scroll case
210: blower fan 220: blower room
300: Bell mouse 400: guide
500: rib 600: shroud

Claims (7)

An air intake case having an inlet and outboard air conversion door for selectively opening and closing the inside and outside air inlets;
A scroll case installed at a lower portion of the air intake case and having a blower chamber rotatably disposed therein;
A circular bell mouse provided inside the air intake case to communicate the inflow chamber and the blower chamber;
A guide part protruding horizontally inwardly of the bell mouse at an end of a circumferential surface of the bell mouse; And
Intake system for a vehicle air conditioner including a rib bent to reduce the noise generated when the outside air flows into the bell mouse at one end of the guide portion.
The method according to claim 1,
Protruding length (X) of the guide unit is an intake system for an air conditioner of a vehicle satisfying Equation 1 below.
Equation 1
3a ≤ X ≤ 7a
Here, a denotes the separation distance between the inner surface of the bell mouse and the protrusion along the upper surface of the shroud.
The method according to claim 1,
The rib is intake system for an air conditioner of a vehicle, characterized in that bent upward or downward at one end of the guide portion.
The method according to claim 1,
The rib is intake system for an air conditioner of a vehicle, characterized in that bent from one end of the guide portion to the upper and lower.
The method according to any one of claims 1 to 4,
The bent length (Y) of the rib is an intake system for an air conditioner of a vehicle satisfying Equation 2 below.
Equation 2
0.5X ≤ Y ≤ 2X
Here, X represents the protruding length of the guide portion protruding inward from the circumferential end of the bell mouse.
The method according to any one of claims 1 to 4,
The installation range of the guide portion,
Intake system for an air conditioner of a vehicle, characterized in that installed in the 280 ° from one end of the inlet of the blower chamber provided in the lower portion of the bell mouse to the other end of the inlet.
The method of claim 6,
Protruding angle of the guide portion is intake system for a vehicle air conditioner, characterized in that -40 ° to 40 ° with respect to the center of the bell mouse within the installation range of the guide portion.

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