Fan shroud assembly

Abstract

The present invention relates to a fan shroud provided in a cooling module, and an object of the present invention is to provide a fan shroud including a peripheral portion surrounding an outer periphery of a fan, and a planar portion coupled face-to-face with a heat exchanger, wherein a noise reduction hole formed by connecting a first hole extending in a circumferential direction of the peripheral portion and a second hole extending toward the planar portion and passing through the planar portion is formed at an appropriate location, so that BPF noise is effectively reduced while minimizing reduction in rigidity and durability of the fan shroud.

Description

TECHNICAL FIELD

[0001] The present application relates to a fan shroud assembly, and more particularly, to a fan shroud assembly of the type in which a fan forcibly blowing air is supported on and coupled to an air-cooled heat exchanger, and a structure capable of reducing noise during the process of blowing air is provided. BACKGROUND

[0002] Generally, various air conditioning systems, cooling systems, etc. are installed in vehicles. The air conditioning system generally includes cooling and heating modules for adjusting air temperature, air humidity, etc. in an interior space in which a vehicle occupant is seated. The cooling system includes modules for cooling an engine, a motor, etc. to prevent the engine, the motor, etc. from overheating. These different modules are configured to achieve desired cooling, heating, and refrigeration operations by transferring heat while circulating a heat exchange medium such as refrigerant and coolant.

[0003] The air conditioning system or the cooling system includes various heat exchangers. Among the heat exchangers, there is an air-cooled heat exchanger that cools a heat exchange medium therein by using outside air. It is well known that the heat exchange efficiency increases as the speed at which air flows to the core of the air-cooled heat exchanger. Therefore, generally, a fan shroud is coupled to the front surface of the air-cooled heat exchanger to forcibly blow air to the core of the heat exchanger, in the case where heat exchange is not allowed to be performed only by the vehicle guiding wind. The fan shroud refers to a device assembly part that stably supports a fan including a hub and a plurality of blades and a motor configured to rotate the fan, and enables the fan and the motor to be coupled to another device.

[0004] Figure 1 is a perspective view of a general fan shroud assembly. As shown, the fan shroud 100 includes a peripheral portion 110 configured to surround the outer periphery of a fan 200 and a planar portion 120 coupled to face the heat exchanger. A ventilation port 150 is formed in the central portion of the peripheral portion 110, and an empty space through which an air flow generated by the fan 200 passes to blow air is provided. A motor provided on the shaft of the fan 200 is accommodated and supported in a hub portion 151 provided at the center of the ventilation port 150. As shown, a plurality of fixing members 152 are radially arranged around the hub portion 151 to stably fix and support the position of the hub portion 151, and two opposite end portions of the fixing members 152 are connected to the inner peripheral edge of the peripheral portion 110 and the outer peripheral edge of the hub portion 151, respectively. In this case, the thickness of the peripheral portion 110 can be generally greater than that of the planar portion 120 to increase the width of the inner peripheral edge of the peripheral portion 110 connected to the fixing members 152, thereby ensuring proper rigidity by increasing the width of the fixing members 152. That is, as in the case of the conventional fan shroud assembly, the fixing members 152 are arranged to be spaced apart from each other by a predetermined distance, and the width of the fixing members 152 is increased to ensure the rigidity of the fan shroud 100. Figure 1clearly shown in the enlarged view shown at the lower side, the peripheral portion 110 protrudes when viewed from the surface of the planar portion 120, and the lateral surface of the peripheral portion 110 is visible. In Figure 1 the enlarged view in FIG. 1 1, the boundary between the peripheral portion 110 and the planar portion 120 is not clearly visible. Therefore, the peripheral portion is shown in a light color, while the planar portion 120 is shown in a dark color.

[0005] Meanwhile, significant noise inevitably occurs during the process in which the fan forcibly blows air. More specifically, generally, when fluid delivered by fluid delivery blades in a fluid machine passes through a cut-off portion of the fluid machine, noise having a pulsating waveform occurs, the pulsating waveform having a frequency that is a product of the number of blades and the rotational speed. This noise is called blade passage frequency (BPF) noise. The blades of the fan 200 correspond to the fluid delivery blades, while the ventilation port 150 corresponds to the cut-off portion. When the fan 200 operates, BPF noise significantly occurs even in the fan shroud assembly.

[0006] Various studies have been conducted to improve the shape or structure of the fan shroud to reduce BPF noise. As an example, Korean Patent Publication No. 2013-0111744 ("Fan shroud for reducing noise", October 11, 2013) discloses a fan shroud as shown in Figure 1 and having a plurality of long holes and a plurality of short holes arranged closer to the outer peripheral edge of the peripheral portion 110 and formed through the planar portion 120. As described above, various techniques have been implemented to reduce BPF noise by forming holes at appropriate locations on the fan shroud and controlling a portion of the airflow passing through the ventilation port 150.

[0007] In another example disclosed in "Reduction of BPF noise radiated from engine cooling fan" (Yoshida K. et al., SAE 2014 World Congress and Exhibition, April 1, 2014), an attempt has been made to reduce BPF noise by changing the shape of the fan shroud. Figure 2 is an embodiment of changing the shape of the fan shroud to reduce BPF noise according to the related art. As Figure 1 and Figure 2 shown in the upper view in FIG. 1, a general fan shroud is shaped such that the planar portion 120 is formed in an approximate rectangular shape corresponding to the shape of the core of the heat exchanger, and the peripheral portion 110 is formed on a central portion of the planar portion 120. It is known that a portion in which the gap between the blades of the fan 200 and the fan shroud is small, when referred to as a narrow portion, a significantly large amount of BPF noise occurs in the narrow portion. As shown in the lower view in Figure 2 , Figure 2The study shown in the middle forms an additional airflow space in the narrow portion in the direction in which the fan 200 rotates, and thus, provides a shape change for reducing BPF noise by expanding the narrow portion. However, it is worrisome that the shape change forms an asymmetric shape of the fan shroud and causes undesirable vibration, which deteriorates the rigidity and durability of the fan shroud and assembly of the fan shroud. In addition, it is also worrisome that the unnecessary vibration causes new vibration noise. Furthermore, since the additional airflow space protrudes from the shape of the existing fan shroud, the additional airflow space inevitably interferes with the surrounding components when the cooling module is assembled and applied to a vehicle package.

[0008] [Related Art Documents]

[0009] [Patent Documents]

[0010] 1. Korean Patent Publication No. 2013-0111744 ("Fan Shroud for Reducing Noise", October 11, 2013)

[0011] [Non-Patent Documents]

[0012] 1. "Reduction of the BPF Noise Radiated from an Engine Cooling Fan" (Yoshida K. et al., SAE 2014 World Congress & Exhibition, April 1, 2014) SUMMARY

[0013] TECHNICAL PROBLEM

[0014] Accordingly, the present application has been made to solve the above problems occurring in the related art, and an object of the present application is to provide a fan shroud assembly including a fan shroud having a peripheral portion configured to surround an outer periphery of a fan and a planar portion coupled to face a heat exchanger, in which a noise reduction hole is formed at an appropriate position and the noise reduction hole is defined by connecting a first hole extending in a circumferential direction of the peripheral portion and a second hole extending toward the planar portion and formed through the planar portion, thereby effectively reducing BPF noise while minimizing deterioration of the rigidity and durability of the fan shroud.

[0015] TECHNICAL SOLUTION

[0016] To achieve this object, the present application provides a fan shroud assembly including: a fan 200 including a hub coupled to a rotating shaft of a motor and a plurality of blades provided on an outer circumferential surface of the hub; and a fan shroud 100 including: a peripheral portion 110 configured to surround an outer periphery of the fan 200; a planar portion 120 coupled to face a heat exchanger; a ventilation port 150 provided in the form of an empty space formed in a central portion of the peripheral portion 110 and configured to allow airflow generated by the fan 200 to pass through the ventilation port 150 to blow air; a hub portion 151 formed at a center of the ventilation port 150 and configured to accommodate and support a motor provided on a shaft of the fan 200; and a plurality of fixing members 152 connected to an inner peripheral edge of the peripheral portion 110 and an outer peripheral edge of the hub portion 151 and provided radially around the hub portion 151, wherein a lateral surface is formed when the peripheral portion 110 protrudes from a surface of the planar portion 120, and wherein at least one noise reduction hole 10 is formed through the lateral surface of the peripheral portion 110 and communicates with the ventilation port 150 to control a portion of the airflow passing through the ventilation port 150.

[0017] In this case, the noise reduction hole 10 can be formed of a first hole 11 formed in the lateral surface of the peripheral portion 110 and extending in a circumferential direction of the peripheral portion.

[0018] Further, the noise reduction hole 10 can be formed by connecting a second hole 12 formed in the lateral surface of the peripheral portion 110, extending toward the planar portion 120 to be inclined with respect to the first hole 11, and formed to pass through the planar portion 120.

[0019] Further, the first hole 11 and the second hole 12 can be connected perpendicularly in the noise reduction hole 10.

[0020] When a circular shape defined by the peripheral portion 110 and a rectangular shape defined by the planar portion 120 overlap each other or portions disposed adjacent to each other are referred to as narrow portions, the fan shroud 100 can have upper and lower narrow portions at which the circular shape of the peripheral portion 110 and the rectangular shape of the planar portion 120 overlap each other, and first and second intermediate narrow portions which are positions at which the peripheral portion 110 has the greatest horizontal length (i.e., vertical center line positions of the peripheral portion 110), and the noise reduction hole 10 can be formed at at least one position selected from the upper and lower narrow portions and the first and second intermediate narrow portions.

[0021] Further, the noise reduction hole 10 can be formed only in either one selected from the first and second intermediate narrow portions.

[0022] When the widths of the first intermediate narrow portion and the second intermediate narrow portion are between the circular shape of the peripheral portion 110 and the rectangular shape of the planar portion 120 at the positions of the first intermediate narrow portion and the second intermediate narrow portion, the noise reduction hole 10 can be formed only on the side with the smaller width when the widths of the first intermediate narrow portion and the second intermediate narrow portion are different from each other.

[0023] Furthermore, the noise reduction hole 10 can be formed such that the length of the first hole 11 is longer than the length of the second hole 12 and shorter than 5% of the perimeter of the peripheral portion 110.

[0024] More specifically, the noise reduction aperture 10 can be configured such that the length of the first aperture 11 is in the range of 30mm to 50mm.

[0025] Furthermore, the noise reduction aperture 10 can be configured such that at least one second aperture 12 is configured for a single first aperture 11.

[0026] Furthermore, the noise reduction aperture 10 can be configured such that a single second aperture 12 is formed for a single first aperture 11, and the second aperture 12 is formed at a central position based on the extending direction of the first aperture 11.

[0027] Furthermore, the noise reduction aperture 10 can be formed such that the width of the first aperture 11 and the second aperture 12 is in the range of 10mm to 30mm.

[0028] In addition, the peripheral portion 110 may include an anti-vortex sawtooth portion 115, which is formed in a sawtooth shape and arranged along a predetermined area of ​​the outer peripheral surface of the peripheral portion 110, and the noise reduction hole 10 may be formed in an area other than the area where the anti-vortex sawtooth portion 115 is formed.

[0029] Beneficial effects

[0030] According to the present invention, holes with optimized shapes are formed at appropriate locations on the fan shroud, thereby achieving a significant effect in effectively reducing BPF noise. More specifically, in the present invention, the noise-reducing holes are formed by connecting a first hole and a second hole, the first hole extending in the circumferential direction of the periphery of the fan configured to surround the fan shroud, the second hole being formed through a planar portion and extending toward the planar portion facing the heat exchanger, and the noise-reducing holes being formed at the centerline location of the fan shroud where airflow is collected, thereby effectively reducing BPF noise by reducing interference between the periphery and the air.

[0031] Furthermore, according to the present invention, it is unnecessary to form a large number of noise-reducing holes. Typically, when holes are formed in any structure, rigidity and durability inevitably deteriorate. Therefore, the deterioration of rigidity and durability can be minimized by minimizing the number of holes.

[0032] Furthermore, in related technologies, when additional airflow space is formed in narrow sections to reduce BPF noise, the asymmetrical shape of the fan shroud leads to the following problems: additional vibration; degradation of rigidity and durability caused by vibration; and the emergence of new vibrations and noise. In contrast, the fan shroud according to the present invention does not have an asymmetrical shape, thereby essentially eliminating the aforementioned problems. Moreover, in related technologies, the additional airflow space protrudes, causing unnecessary interference with surrounding objects when encapsulating the cooling module. In contrast, the present invention does not cause this problem. Attached Figure Description

[0033] Figure 1 This is a 3D view of a fan shroud assembly in related technologies.

[0034] Figure 2 This is a diagram illustrating an implementation of reducing BPF noise by changing the shape of the fan shroud in related technologies.

[0035] Figure 3 This is a perspective view of the fan guard assembly of the present invention.

[0036] Figure 4 This is a side view of the fan shield assembly of the present invention.

[0037] Figure 5 This is a front view of the fan guard assembly of the present invention.

[0038] Figure 6 This is a diagram illustrating an experimental embodiment for obtaining the optimal position of the noise reduction aperture of the present invention.

[0039] Figure 7 This is a diagram illustrating an experimental embodiment for obtaining the basic shape of the noise reduction aperture of the present invention.

[0040] Figure 8 This is a diagram illustrating an experimental embodiment for obtaining the optimal shape of the noise-reducing aperture of the present invention.

[0041] Figure 9 This is a diagram illustrating various embodiments of the shape of the noise reduction aperture of the present invention.

[0042] Description of reference numerals in the attached figures

[0043] 100: Fan shield

[0044] 110: Peripheral part, 120: Planar part

[0045] 150: Ventilation port

[0046] 151: Hub section; 152: Fixing component

[0047] 10: Noise Reduction Hole

[0048] 11: First hole, 12: Second hole Detailed Implementation

[0049] In the following, the fan shroud assembly according to the invention configured as described above will be described in detail with reference to the accompanying drawings.

[0050] [1] The overall configuration of the fan shroud with noise reduction holes according to the present invention

[0051] Figure 3 This is a perspective view of the fan guard assembly of the present invention. Figure 4 This is a side view of the fan shroud assembly of the present invention, and Figure 5 This is a front view of the fan shroud assembly of the present invention. Figures 3 to 5 As shown, similar to a conventional fan shroud, the basic shape of the fan shroud 100 of the present invention includes a peripheral portion 110 and a planar portion 120, the peripheral portion being configured to surround the outer periphery of the fan 200, and the planar portion being connected to face the heat exchanger. Naturally, an air vent 150 for blowing air is formed in the central portion of the peripheral portion 110. A hub portion 151 configured to house and support the motor is disposed in the air vent 150, and a fixing member 152 configured to fix and support the hub portion 151 is disposed in the air vent 150. Furthermore, similar to a conventional fan shroud, the peripheral portion 110 has a transverse surface protruding from the surface of the planar portion 120. The peripheral portion 110 may include an anti-vortex serrated portion 115, which is formed in a serrated shape and arranged along a predetermined area of ​​the outer peripheral surface of the peripheral portion 110. Figure 1 As shown in the enlarged image, Figures 3 to 5 As shown in the enlarged view, the boundary between the peripheral portion 110 and the planar portion 120 is not clearly visible. Therefore, the peripheral portion 110 is shown in a light color, while the planar portion 120 is shown in a dark color.

[0052] In this configuration, at least one noise-reducing hole 10 is formed through the lateral surface of the peripheral portion 110 of the fan shroud 100 of the present invention and communicates with the ventilation port 150, thereby controlling a portion of the airflow passing through the ventilation port 150 and reducing BPF noise caused by the airflow. In this configuration, with the anti-vortex serrated portion 115 provided on the peripheral portion 110, the noise-reducing hole 10 can be formed in an area other than the area where the anti-vortex serrated portion 115 is formed. When the airflow is intentionally and additionally formed by the noise-reducing hole 10, the shape of the flow causing BPF noise can be altered from the original airflow, which allows for the reduction of BPF noise.

[0053] The noise reduction aperture 10 of the present invention can be substantially formed as a first aperture 11, which is formed in the transverse surface of the peripheral portion 110 and extends in the circumferential direction of the peripheral portion 110. Furthermore, as... Figure 3 As shown in the enlarged view, the noise reduction aperture 10 of the present invention can be formed in a shape connected to a second aperture 12, which is formed in the transverse surface of the peripheral portion 110, extends toward the planar portion 120 at an incline relative to the first aperture 11, and is formed through the planar portion 120. In this case, in particular, the first aperture 11 and the second aperture 12 can be connected vertically. Figure 4 This is a side view of the fan shroud 100. (As shown) Figure 4 As shown in the enlarged view, a portion of the first hole 11 and a portion of the second hole 12 formed in the transverse surface of the peripheral portion 110 are clearly shown. Figure 5 This is a front view of the fan shroud 100. As shown on the front surface, the lateral surfaces of the peripheral portion 110 are not visible, and... Figure 5 The enlarged view in the image only shows a portion of the end of the second hole 12.

[0054] As described above, the noise reduction hole 10 with a special shape of the present invention can be formed at an appropriate position on the fan shroud 100, thereby more effectively reducing BPF noise. In the following, various embodiments for obtaining the optimal position, basic shape, and optimal shape of the noise reduction hole 10 will be described in more detail.

[0055] [2] Embodiment for obtaining the optimal position of the noise reduction hole in the fan shroud of the present invention

[0056] Figure 6 An experimental embodiment for obtaining the optimal position of the noise reduction aperture of the present invention is shown. As described above, in the fan shroud 100, the peripheral portion 110 has an approximately circular shape, while the planar portion 120 has an approximately rectangular shape. That is, the fan shroud 100 has a shape formed by a combination of the circular shape defined by the peripheral portion 110 and the rectangular shape defined by the planar portion 120.

[0057] Ventilation port 150 is formed in the central portion of peripheral portion 110, and planar portion 120 is connected to face the heat exchanger. A relatively large amount of air is accumulated and collected on portions where the circular shape defined by peripheral portion 110 and the rectangular shape defined by planar portion 120 overlap or are adjacent to each other, causing a large amount of air to flow in a relatively narrow area, which causes BPF noise. Figure 6In the fan shroud 100 of the illustrated embodiment, there are upper and lower narrow portions where the circular shape of the peripheral portion 110 and the rectangular shape of the planar portion 120 overlap. The first and second intermediate narrow portions are the locations where the peripheral portion 110 has the maximum horizontal length, i.e., the locations of the vertical center lines of the peripheral portion 110. As described above, since the noise reduction aperture 10 is used to reduce BPF noise, the noise reduction aperture 10 can be formed at at least one location selected from the narrow portions (upper narrow portion, lower narrow portion, and first and second intermediate narrow portions).

[0058] Meanwhile, considering the structural rigidity of the structure, the noise reduction hole 10 can be considered a defect formed in the structure. Therefore, considering the rigidity and durability of the fan shroud 100, the noise reduction hole 10 can be formed to a minimum. The problems caused by the narrow portion or the relative advantages and disadvantages will be described below.

[0059] The upper narrow part is composed of Figure 6 The sample _A2 in the text represents the part. When the noise reduction hole 10 is formed in the upper narrow section, surrounding objects are often placed during the assembly of various vehicle components. Furthermore, foreign objects falling from above may fall towards the fan 200 as they pass through the noise reduction hole 10, posing a risk of undesirable impacts on the fan 200.

[0060] The lower narrow part is composed of Figure 6 The sample _A3 in the text represents the portion. However, in most cases, the drain port for discharging excess moisture (such as condensate generated in the heat exchanger) is formed at the location of the lower narrow section. Therefore, forming an additional hole is not feasible.

[0061] The first narrow section is composed of Figure 6 The portion represented by sample _A1 in the text, and the second intermediate narrow portion is composed of Figure 6 The sample A4 represents the portion. Both the first and second intermediate narrow portions are positioned at the vertical centerline of the fan shroud 100, and a relatively large amount of air is collected in both the first and second intermediate narrow portions compared to the surrounding portions. Therefore, the first and second intermediate narrow portions are suitable for forming the noise reduction hole 10. In this case, as described above, considering the rigidity and durability of the fan shroud, the noise reduction hole 10 can be formed in either the first or second intermediate narrow portion, rather than in both. Figure 6In the fan shroud 100 exemplarily shown, the widths of the first and second intermediate narrow portions (i.e., the width between the circular shape of the peripheral portion 110 and the rectangular shape of the planar portion 120) are equal to each other. Therefore, either the first or the second intermediate narrow portion can be selected. Meanwhile, as... Figure 6 As shown, the fan shroud 100 may not be formed solely in a vertically symmetrical manner. The ventilation port 150 may sometimes be offset towards either the left or right side. In this case, the widths of the first and second intermediate narrow portions may, of course, be different from each other. In this case, the portion that accumulates a large amount of air can naturally be the portion with the smaller width.

[0062] Taking these various factors into account, the noise reduction aperture 10 can essentially be formed only at either the location selected from the first intermediate narrow portion and the second intermediate narrow portion. Furthermore, assuming the widths of the first and second intermediate narrow portions are between the circular shape of the peripheral portion 110 and the rectangular shape of the planar portion 120 at the locations of the first and second intermediate narrow portions, then if the widths of the first and second intermediate narrow portions are different from each other, the noise reduction aperture 10 can be formed only on the side with the smaller width.

[0063] [3] Embodiment for obtaining the basic shape of the noise reduction hole in the fan shroud of the present invention

[0064] Figure 7 An experimental method for obtaining the basic shape of the noise-reducing aperture of the present invention is shown. In other words, Figure 7 The experiment is related to the process of obtaining the noise reduction hole 10 in the shape of the first hole 11 and the second hole 12 combined, that is, the process of obtaining the basic shape of the noise reduction hole 10 of the present invention.

[0065] exist Figure 7 In the experiment shown in the figure above (i.e., represented by sample_B1), the noise reduction aperture 10 was not formed; that is, this experiment corresponds to... Figure 1 The fan shroud shown is part of the related technology. Figure 7 In the experiment shown in the intermediate diagram (i.e., represented by sample_B2), the noise reduction aperture 10 is formed only by the first aperture 11. Finally, in Figure 7 In the experiment shown in the figure below (i.e., represented by sample_B3), the noise reduction hole 10 is formed by the first hole 11 and the second hole 12, which allows the air to be discharged more smoothly.

[0066] [Table 1]

[0067]

[0068] As clearly shown in Table 1, it can be determined that, compared to sample B1, which corresponds to a fan shroud without noise reduction holes 10 in the related art, the BPF noise is reduced by approximately 2.5 dB in sample B2, which has noise reduction holes 10 formed only by the first hole 11. Furthermore, it can be determined that, compared to sample B2, the BPF noise is reduced by approximately 3 dB in sample B3, which has noise reduction holes 10 formed by a combination of the first hole 11 and the second hole 12, demonstrating superior performance. In other words, it has been experimentally demonstrated that when a second hole 12 is additionally formed, the effect of reducing BPF noise is improved as the accumulated air is discharged more smoothly.

[0069] The configuration of the noise reduction hole 10 formed by the combination of the first hole 11 and the second hole 12 in this invention was made by applying the above-mentioned experimental results.

[0070] [4] An embodiment for obtaining the optimal shape of the noise reduction hole in the fan shroud of the present invention.

[0071] Figure 8 An experimental embodiment for obtaining the optimal shape of the noise-reducing aperture of the present invention is shown. More specifically, Figure 8 The experiment conducted by varying the length of the first hole 11 is shown. Tests were performed by sequentially changing the length of the first hole 11 to 45 mm, 35 mm, and 25 mm. Figure 8 The samples C1 to C3 are shown in the upper and lower figures below. The specific test conditions are shown in Table 2 below.

[0072] [Table 2]

[0073]

[0074] As clearly shown in the results in Table 2, the effect of reducing BPF noise increases with the increase of the length of the first aperture 11. Specifically, it can be determined that in sample C1 with a first aperture 11 length of 45 mm, the BPF noise is reduced by approximately 3 dB; in sample C2 with a first aperture 11 length of 35 mm, the BPF noise is reduced by approximately 2.5 dB; and in sample C3 with a first aperture 11 length of 25 mm, the BPF noise is reduced by approximately 2 dB.

[0075] Therefore, based solely on the fact that the effect of reducing BPF noise increases with the increase of the length of the first hole 11, it can be considered that a longer length of the first hole 11 is effective. However, as mentioned above, since the noise reduction hole 10 itself can act as a structural damage component in the fan shroud 100, an excessively large noise reduction hole 10 can lead to undesirable degradation of rigidity and durability.

[0076] Taking these various factors into account, the noise reduction hole 10 can be formed such that the length of the first hole 11 is longer than the length of the second hole 12 and shorter than 5% of the circumference of the peripheral portion 110. When the size of the general fan shroud 100 is expressed in a specific value, the noise reduction hole 10 can be formed such that the length of the first hole 11 is in the range of 30mm to 50mm.

[0077] Figure 9 Various embodiments of the shape of the noise-reducing aperture of the present invention are shown. Similar to previous experiments, Figure 9 The sample _D1 is a case in which a single second hole 12 is formed for a single first hole 11, and the second hole 12 is formed at the center position based on the extension direction of the first hole 11. Figure 9 Samples D2 to D4 represent cases where multiple second holes 12 are formed for a single first hole 11. Sample D2 represents a case where the second holes 12 are formed at two opposite ends of the first hole 11. Sample D3 represents a case where multiple second holes 12 are formed offset at the center position of the first hole 11. Sample D4 represents a case where the second holes 12 are formed at all two opposite ends and the center position of the first hole 11.

[0078] It can be expected that the air emission effect will improve as the number of second holes 12 increases. However, in practice, the air emission effect is excellent when the second hole 12 is formed at the center of the first hole 11, and the effect tends to deteriorate significantly as the second hole is positioned closer to the two opposite ends. Furthermore, from a manufacturability perspective, the more complex the shape of the noise reduction hole 10, the more difficult it is to manufacture. Considering these factors, such as... Figure 9 As in sample _D1, the noise reduction aperture 10 can be formed such that a single second aperture 12 is formed for a single first aperture 11, and the second aperture 12 is formed at the center position based on the extension direction of the first aperture 11.

[0079] Meanwhile, the widths of the first hole 11 and the second hole 12 can be considered. For ease of design, it is easiest to form the first hole 11 and the second hole 12 with the same width. However, considering the effect of air exhaust, the width of the second hole 12 can be greater than the width of the first hole 11. However, considering the general size of the fan shroud 100, the widths of the first hole 11 and the second hole 12 can be in the range of 10mm to 30mm, so that, as mentioned above, the rigidity and durability of the fan shroud are not unnecessarily excessively reduced due to the presence of the noise reduction hole 10.

[0080] This invention is not limited to the embodiments described above, and its application scope is diverse. Of course, any person skilled in the art can make various modifications and implementations without departing from the subject matter claimed in the claims.

[0081] Industrial applicability

[0082] According to the present invention, holes with optimized shapes are formed at appropriate locations on the fan shroud, thereby achieving a significant effect in effectively reducing BPF noise. The holes are highly compatible because, in related technologies, they are applied without altering the overall structure of the fan shroud, which is advantageous in the manufacture and production of fan shrouds.

Claims

1. A fan shroud assembly, the fan shroud assembly comprising: A fan, the fan including a hub connected to a rotating shaft of a motor and a plurality of blades disposed on the outer peripheral surface of the hub; as well as A fan shroud includes: a peripheral portion configured to surround an outer periphery of a fan; a planar portion connected to face a heat exchanger; a ventilation port provided in the form of an empty space formed in the central portion of the peripheral portion and configured to allow airflow generated by the fan to pass through the ventilation port to blow air; a hub portion formed at the center of the ventilation port and configured to house and support the motor mounted on the shaft of the fan; and a plurality of fixing members connected to the inner peripheral edge of the peripheral portion and the outer peripheral edge of the hub portion, and arranged radially around the hub portion. The lateral surface of the peripheral portion is formed by protruding from the surface of the planar portion. At least one noise-reducing hole is formed through the lateral surface of the peripheral portion and communicates with the ventilation port to control a portion of the airflow passing through the ventilation port. Wherein, when the portion defined by the peripheral portion and the portion defined by the planar portion overlap or are arranged to be adjacent to each other is called the narrow portion, the noise reduction hole is formed in the narrow portion.

2. The fan shroud assembly according to claim 1, wherein, The noise reduction hole is formed by a first hole, which is formed in the transverse surface of the peripheral portion and extends along the circumferential direction of the peripheral portion.

3. The fan shroud assembly according to claim 2, wherein, The noise reduction hole is formed by connecting a second hole, which is formed in the lateral surface of the peripheral portion, extends toward the planar portion at an inclination relative to the first hole, and is formed to pass through the planar portion.

4. The fan shroud assembly according to claim 3, wherein, The first hole and the second hole are vertically connected in the noise reduction hole.

5. The fan shroud assembly according to claim 1, wherein, The fan shroud has an upper narrow portion, a lower narrow portion, a first middle narrow portion, and a second middle narrow portion. At the upper and lower narrow portions, the circular shape of the peripheral portion and the rectangular shape of the planar portion overlap each other. The first and second middle narrow portions are located where the peripheral portion has its maximum horizontal length, i.e., at the vertical centerline position of the peripheral portion. The noise reduction hole is formed at at least one location selected from the upper narrow portion, the lower narrow portion, the first intermediate narrow portion, and the second intermediate narrow portion.

6. The fan shroud assembly according to claim 5, wherein, The noise reduction aperture is formed only in either the first intermediate narrow portion or the second intermediate narrow portion.

7. The fan shroud assembly according to claim 6, wherein, When the widths of the first intermediate narrow portion and the second intermediate narrow portion are between the circular shape of the peripheral portion and the rectangular shape of the planar portion at the positions of the first intermediate narrow portion and the second intermediate narrow portion, the noise reduction hole is formed only on the side with the smaller width when the widths of the first intermediate narrow portion and the second intermediate narrow portion are different from each other.

8. The fan shroud assembly according to claim 3, wherein, The noise reduction hole is formed such that the length of the first hole is longer than the length of the second hole and shorter than 5% of the perimeter of the peripheral portion.

9. The fan shroud assembly according to claim 8, wherein, The noise reduction hole is formed such that the length of the first hole is in the range of 30mm to 50mm.

10. The fan shroud assembly according to claim 3, wherein, The noise reduction aperture is formed such that at least one second aperture is formed for a single first aperture.

11. The fan shroud assembly according to claim 3, wherein, The noise reduction aperture is formed such that a single second aperture is formed for a single first aperture, and the second aperture is formed at a central position based on the extension direction of the first aperture.

12. The fan shroud assembly according to claim 3, wherein, The noise reduction holes are formed such that the widths of the first hole and the second hole are in the range of 10mm to 30mm.

13. The fan shroud assembly according to claim 1, wherein, The peripheral portion includes an anti-vortex sawtooth portion, which is formed in a sawtooth shape and arranged along a predetermined area of ​​the outer peripheral surface of the peripheral portion. The noise reduction hole is formed in a region other than the region forming the anti-eddy current sawtooth portion.

Images