KR20100050091A - Rear air conditioner for vehicles - Google Patents

Abstract

PURPOSE: A rear air conditioning system for a vehicle is provided to prevent air blown to a cut-off region from flowing inside a centrifugal fan. CONSTITUTION: A rear air conditioning system for a vehicle comprises a case for an air conditioner, a centrifugal fan, and a noise reduction unit(100a). A noise reduction unit comprises and a shielding plate(100). The shielding board is formed on the inner circumference of the air injection hole and shields the partial domain of the air injection hole. Multiple straight lines(101) are formed in the inner circumference of the shielding board. The initial point(S) and endpoint(E) of the straight line is located on the upper side of a center horizontal line(L1) of the air injection hole.

Description

Rear air conditioner for vehicles

The present invention relates to a rear air conditioner for a vehicle, and more particularly, a shielding plate is formed to shield a portion of an air inlet port of a scroll case, but the inner circumferential surface of the shielding plate is formed of a plurality of straight portions, so that the air blown into the cut-off area. The present invention relates to a rear air conditioner for a vehicle capable of blocking a phenomenon in which the back flow of the centrifugal fan is prevented to reduce RUMBLE noise, thereby improving passenger's emotional quality.

Charging air conditioner is a vehicle interior that is installed for the purpose of securing the driver's front and rear view by removing the frost that is caught in the windshield during the rainy season or winter, or cooling the car's interior in the summer or winter. Such an air conditioning apparatus is usually equipped with a heating system and a cooling system at the same time, and then selectively introduces air or bet, and then heats or cools the air and blows it into the interior of the vehicle to cool, heat, or ventilate the interior of the vehicle.

However, a general vehicle air conditioner is a front air conditioner, so that air for cooling or heating is discharged from a discharge port formed in an instrument panel in front of a vehicle interior, and thus a vehicle having a large indoor space, for example, a luxury car or an SUV vehicle. In the case of a vehicle with a large indoor space, the cooling or heating effect is insufficient to the rear seat.

Therefore, in the case of a vehicle having a large indoor space as described above, in order to assist the cooling and heating performance for the rear seat, as shown in FIGS. 1 and 3, a separate rear air conditioner 1 is provided on the upper side of the rear wheel cover 5. Is installing.

1 to 3, the rear air conditioner 1 has a circular air inlet 12 formed at one side of the scroll case 11 provided at the inlet side, and a plurality of air outlets 13 are provided at the outlet side. The blower unit 20 and the blower unit 20 are installed in the scroll case 11 and suck air from the air inlet 12 and blow air into the air conditioning case 10. 10, the evaporator 14 and the heater core 15 to cool or heat the air blown from the blower unit 20 are sequentially installed at regular intervals, the evaporator 14 and the heater core 15 It is installed between the temperature control door 16 for controlling the temperature by adjusting the amount of mixing of cold and warm air, and the mode door for opening and closing the air outlet 13 in accordance with the air-conditioning mode is installed on the air outlet (13) ( 17).

The air outlet 13 is a vent outlet 13a for blowing air heat exchanged in the air conditioning case 10 to the roof side of the vehicle, and for blowing to the floor side of the vehicle. It branches to the floor outlet 13b.

In addition, the blower unit 20 is installed on the opposite side of the air inlet 12 of the centrifugal fan 22 and the scroll case 11 rotatably installed in the scroll case 11 to the centrifugal fan. It consists of a motor 21 for driving 22.

Therefore, when the centrifugal fan 22 is rotated, the low pressure is formed inside the centrifugal fan 22 by the rotation of the centrifugal fan 22, so that the centrifugal fan 22 is opened through the air inlet 12. Air is sucked in the axial direction and blown in the radial direction of the centrifugal fan 22, and the blower air flows along the inner wall surface of the scroll case 11 through the outlet 11b of the scroll case 11. Is discharged to the inside of the

That is, when the centrifugal fan 22 rotates, the air blown in the radial direction of the centrifugal fan 22 flows from the beginning of the scroll case 11 along the inner wall of the scroll case 11 to the centrifugal fan ( While rotating in the rotational direction of 22, it will flow toward the exit of the scroll case (11).

The rear air conditioner 1 is installed on the upper side of the rear wheel cover 5 as shown in FIG. 3, but a narrow space between the outer panel 6 and the inner panel 7 of the vehicle, that is, an area into which air is introduced. It is usually installed in this narrow section and has a problem that is vulnerable to noise.

That is, when the flow resistance increases when the air blown from the centrifugal fan 22 flows inside the air conditioning case 10, the air volume decreases, and at this time, the scroll start portion and the outlet 11b of the scroll case 11 are reduced. In the area where the side meets, that is, the cut-off (11a) area, a high exit static pressure is generated and resistance in the scroll case 11 increases, causing the centrifugal fan 22 to fail. .

As a result, in the vicinity of the cut-off 11a, a backflow phenomenon of the blowing air is generated, and low frequency noise, RUMBLE noise, is generated, which causes a discomfort and fatigue to passengers.

On the other hand, Japanese Patent Application Laid-open No. Hei 10-252682 is disclosed as another conventional technique, which covers the air inlet at the outer edge of the opening of the air inlet and simultaneously forms a guide wall inclined in the axial direction of the centrifugal fan. By doing so, the low frequency noise is reduced while suppressing the decrease in the airflow amount.

However, the above technique is a technique related to a blower of a front air conditioning apparatus having a sufficient air suction space, and it is difficult to apply when the air suction space is narrow, such as a rear air conditioning apparatus.

An object of the present invention for solving the above problems is to form a shielding plate to shield a portion of the air inlet port of the scroll case, but the inner circumferential surface of the shielding plate is formed of a plurality of straight portions, the air blown to the cut-off area is centrifugal It is to provide a rear air conditioner for a vehicle that can block the phenomenon of the back flow to the inside of the fan to reduce the rumble noise, thereby improving the emotional quality of the passengers.

The present invention for achieving the above object is an air inlet is formed on one side of the scroll case provided on the inlet side and the air-conditioning case formed with a plurality of air outlets on the outlet side, rotatably installed inside the scroll case and the A centrifugal fan that sucks air from an air inlet and blows it into an air conditioning case, and a noise reduction means formed on an inner circumferential surface of the air inlet to reduce noise during air intake by a centrifugal fan. The noise reduction means is formed by forming a shielding plate to shield a partial region of the air inlet on the inner circumferential surface of the air inlet, and the inner circumferential surface of the shielding plate is formed of a plurality of straight portions, and the start point and the end point of the straight portion are the air. It is formed so as to be located above the center horizontal line of the inlet, At least one corner portion meet is characterized in that it is formed so as to be positioned on the lower side with respect to the central horizontal line.

According to the present invention, a shielding plate is formed so as to shield a portion of the air inlet port of the scroll case, and the shielding plate is formed adjacent to the cut-off area, and the inner circumferential surface of the shielding plate is formed of a plurality of straight portions so that the air blown to the cut-off area is a centrifugal fan. The phenomenon of backflow back to the inside of the is blocked to reduce the rumble noise, thereby improving the passenger's emotional quality.

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

Incidentally, the same parts as in the prior art will be described with the same reference numerals.

Figure 4 is a cross-sectional view showing a state in which a shield plate is formed in the air inlet in the vehicle air conditioner according to the present invention, Figure 5 is a view showing a scroll case seen in the direction B of Figure 4, Figure 6 is a shield plate in Figure 5 Figure 7 is an enlarged view, Figure 7 is a graph comparing the noise according to the present invention and the presence of a conventional shield plate.

First, the vehicle rear air conditioner according to the present invention will be briefly described with reference to the conventional drawings. The rear air conditioner is located in the space between the outer panel 6 and the inner panel 7 of the vehicle at the upper side of the rear wheel cover 5. By being installed, the air conditioner includes a large air conditioner case 10, a blower unit 20, and noise reduction means 100a.

The air conditioning case 10 is provided with an air passage so that air can flow therein, a scroll case 11 is provided at the inlet side, and a plurality of air outlets 13 are formed at the outlet side. At this time, the air inlet 12 is formed on one side of the scroll case (11).

Here, the air conditioner case 10 is installed on the rear wheel cover 5 upper side of the vehicle such that the air inlet 12 is in a vertical state.

In addition, the evaporator 14 and the heater core 15 are sequentially installed at regular intervals to cool or heat the air blown from the blower unit 20 in the air conditioning case 10.

In addition, between the evaporator 14 and the heater core 15, the temperature control door 16 for controlling the temperature by adjusting the mixing amount of the cold bypassing the heater core 15 and the warmth passing through the heater core 15 ) Is installed, the mode door 17 for opening and closing the air discharge port 13 in accordance with the air conditioning mode is installed on the air discharge port (13) side.

In addition, the blower unit 20 is rotatably installed in the scroll case 11 so as to suck air through the air inlet 12 and blow the air into the air conditioning case 10. And a motor 21 installed at an opposite side of the air inlet 12 of the scroll case 11 to drive the centrifugal fan 22.

Accordingly, when the air is sucked by the rotation of the centrifugal fan 22, the air inlet 12 guides the air to the inside of the centrifugal fan 22, and the air sucked into the centrifugal fan 22 is then centrifuged. While blowing in the radial direction of the fan 22 flows along the inner wall surface of the scroll case 11 is blown into the air conditioning case (10).

On the other hand, the air discharge port 13 is a vent outlet (13a) for blowing air heat exchanged inside the air conditioning case 10 to the roof side of the vehicle, and to the floor (floor) side of the vehicle It branches to the floor outlet 13b for blowing air.

In addition, a cut-off 11a is formed at a boundary portion where the scroll start portion of the scroll case 11 and the exit 11b side of the scroll case 11 meet.

In addition, the noise reduction means 100a is a shielding plate 100 for shielding a partial region of the air inlet 12 on the inner circumferential surface of the air inlet 12 so as to reduce the noise during the air intake by the centrifugal fan 22. ) Is formed integrally.

The shielding plate 100 is integrally formed on the inner circumferential surface of the air inlet 12, but is formed to extend in a flat shape toward the center of the air inlet 12.

At this time, the inner circumferential surface of the shielding plate 100 extending toward the center of the air inlet 12 is formed of a plurality of straight portions 101, the start point (S) and the end point (E) of the straight portion 101 Is formed so as to be located on the upper side relative to the center horizontal line (L1) of the air inlet 12, at least one of the vertices that each of the straight portion 101 meets so as to be located below the central horizontal line (L1). Is formed.

In more detail, the upper limit line L2 is drawn in parallel at a position spaced at a predetermined distance upwardly based on the center horizontal line L1 of the air inlet 12, and the lower limit is spaced at the same interval as the upper limit line L2. When the lower limit line L3 is drawn in parallel at a predetermined position, the start point S and the end point E of the straight line portion 101 are located on the upper limit line L2, and at least among vertices at which the respective straight line portions 101 meet. One is located on the lower limit line L3.

Here, the start point S and the end point E of the straight portion 101 are located on the same line (upper limit line L2).

In the drawing, a total of four straight portions 101 are formed on the inner circumferential surface of the shielding plate 100, and at this time, the straight portions 101 and the straight lines positioned at the end point E of the straight portion 101 are formed. The portion 101 is formed to span the central horizontal line L1 of the air inlet 12, respectively, and the two straight portions 101 disposed therebetween are the central horizontal line L1 and the lower limit line (the air inlet 12). It was formed between L3).

In addition, it is preferable to form a round portion 102 between the straight portions 101.

The shielding plate 100 as described above is formed adjacent to the cutoff 11a region. That is, when the centrifugal fan 22 is rotated, the air blown in the radial direction of the centrifugal fan 22 starts at the scroll start of the scroll case 11 and follows the inner wall surface of the scroll case 11. While rotating in the direction of rotation of 22, it flows toward the outlet 11b and is blown to the air conditioning case 10. In this process, if the flow resistance increases, the air volume decreases, and at this time, a high outlet in the cut-off 11a region. Positive pressure is generated. As a result, in the vicinity of the cutoff 11a, a backflow phenomenon of the blowing air occurs, and when the air sucked through the air inlet 12 and the backflowing air collide with each other, rumble noise may occur.

Accordingly, by forming the shielding plate 100 adjacent to the cutoff 11a area to surround the cutoff 11a area, air sucked through the air inlet 12 is discharged from the centrifugal fan 22. When the air is blown in the radial direction, the amount of air blown toward the cut-off 11a area is reduced to prevent the backflow of the wind, thereby reducing the rumble noise and improving the passenger's emotional quality.

FIG. 7 is a graph comparing noise according to the present invention and the presence or absence of a conventional shielding plate 100. Rumble noise is measured while driving the centrifugal fan 22 by applying the same voltage to each motor 21. As shown in FIG. It is.

As can be seen, it can be seen that the noise is significantly improved at the portion indicated by the dotted lines in the present invention and the conventional noise comparison graph.

Hereinafter, the operation of the vehicle rear air conditioner according to the present invention will be described.

First, when the centrifugal fan 22 is rotated, as the low pressure is formed inside the centrifugal fan 22 by the rotation of the centrifugal fan 22, the air flows through the air inlet 12. Is blown in the axial direction of the centrifugal fan (22), and the blown air flows along the inner wall surface of the scroll case (11) and blows into the air conditioning case (10) through the outlet (11b) side. do.

That is, when the centrifugal fan 22 is rotated, the air blown in the radial direction of the centrifugal fan 22 starts at the scroll start of the scroll case 11 and follows the inner wall surface of the scroll case 11. While flowing toward the outlet 11b while rotating in the rotational direction of 22, it is blown to the air conditioning case 10. In this process, when the flow resistance increases, a high outlet static pressure is generated in the cutoff 11a region. As a result, backflow of the blower air may occur near the cutoff 11a.

In the present invention, the shielding plate 100 is formed on the inner circumferential surface of the air inlet 12 so as to be adjacent to the cutoff 11a area, and the inner circumferential surface of the shielding plate 100 is formed of a plurality of straight portions 101. As a result, when the air sucked through the air inlet 12 is blown in the radial direction of the centrifugal fan 22, the amount of air blown toward the cut-off 11a area is reduced, so that the wind flows back to the inside of the centrifugal fan 22 again. By blocking the phenomenon, the air sucked into the air inlet 12 and the countercurrent air do not collide with each other, thereby reducing the rumble noise.

1 is a perspective view showing a state in which a conventional rear air conditioner is installed;

2 is a cross-sectional view showing a conventional rear air conditioner;

3 is a cross-sectional view taken along the line A-A of FIG.

4 is a cross-sectional view showing a state in which a shield plate is formed in the air inlet in the vehicle air conditioner according to the present invention;

FIG. 5 is a view illustrating a scroll case viewed from the direction B of FIG. 4;

6 is an enlarged view of the shielding plate in FIG. 5;

Figure 7 is a graph comparing the noise according to the present invention and the presence or absence of a conventional shield plate.

<Description of Signs of Major Parts of Drawings>

11: scroll case 12: air inlet

100: shielding plate 100a: noise reduction means

101: straight portion 102: round portion

Claims (5)

An air inlet 12 is formed at one side of the scroll case 11 provided at the inlet side, and an air-conditioning case 10 having a plurality of air outlets 13 formed at the outlet side, and rotatable inside the scroll case 11. And a centrifugal fan 22 that sucks air from the air inlet 12 and blows the air into the air conditioning case 10, and is formed on an inner circumferential surface of the air inlet 12 so that the centrifugal fan 22 is formed. In the vehicle rear air conditioner comprising a noise reduction means (100a) for reducing the noise during the air intake, The noise reduction means 100a is formed by forming a shielding plate 100 on the inner circumferential surface of the air inlet 12 to shield a portion of the air inlet 12. The inner circumferential surface of the shielding plate 100 is formed of a plurality of straight portions 101, the starting point (S) and the end point (E) of the straight portion 101 is the central horizontal line (L1) of the air inlet 12 It is formed so as to be located on the upper side as a reference, at least one of the vertices of each of the straight line portion 101 is formed to be positioned to the lower side relative to the center horizontal line (L1). The method of claim 1, The upper limit line L2 is drawn at a position spaced apart at a predetermined interval upwards based on the center horizontal line L1 of the air inlet 12, and the lower limit line L3 at a position spaced at the same interval as the upper limit line L2 at a lower side thereof. In the drawing, the starting point S and the end point E of the straight line portion 101 are located on the upper limit line L2, and at least one of the vertices of each of the straight lines 101 meets the lower limit line L3. Vehicle rear air conditioner, characterized in that located. The method of claim 1, The shielding plate (100) is a vehicle rear air conditioning apparatus, characterized in that formed adjacent to the cut-off (Cut-Off) (11a) region formed inside the scroll case (11). The method of claim 1, The vehicle rear air conditioner, characterized in that the round portion 102 is formed between each of the straight portion (101). The method of claim 1, The air conditioning case (10) is installed on the rear side of the rear cover (5) of the vehicle, the air inlet 12, characterized in that the air inlet 12 is installed so that the vertical state.

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