Fan shroud assembly

Abstract

The present invention relates to a fan shroud provided in a cooling module, wherein an object of the present invention is to provide a fan shroud assembly that effectively reduces BPF noise by selectively forming a baffle in a portion of a section between a plurality of fixing members formed on a fan shroud vent hole, while preventing deterioration of rigidity and durability of the fan shroud.

Description

Technical Field

[0001] The present invention relates to a fan shroud assembly, and more specifically, to a fan shroud assembly in which a fan forcibly blows air is supported on and connected to an air-cooled heat exchanger, and provides a structure capable of reducing noise during the air blowing process. Background Technology

[0002] Typically, various air conditioning and cooling systems are installed in vehicles. Air conditioning systems generally include cooling and heating modules for regulating the air temperature and humidity in the vehicle's interior space where the occupants reside. Cooling systems include modules for cooling the engine, motor, and other components to prevent overheating. These different modules are configured to achieve the desired cooling, heating, and cooling operations by transferring heat while circulating a heat exchange medium (such as refrigerant and coolant).

[0003] Air conditioning or cooling systems include various heat exchangers. Among these heat exchangers, there are air-cooled heat exchangers that use external air to cool the heat exchange medium. It is well known that heat exchange efficiency increases with the velocity of airflow to the core of an air-cooled heat exchanger. Therefore, typically, where heat exchange via vehicle-guided airflow is not permitted, a fan shroud is attached to the front surface of the air-cooled heat exchanger to force airflow towards the core of the heat exchanger. A fan shroud is a component that stably supports a fan, including a hub and multiple blades, and a motor configured to rotate the fan, and allows the fan and motor to be connected to another device.

[0004] Figure 1 This is a perspective view of a typical fan shroud assembly. As shown, the fan shroud 100 includes a peripheral portion 110 and a planar portion 120. The peripheral portion 110 is configured to surround the outer periphery of the fan 200, and the planar portion 120 is configured to face the heat exchanger. An air vent 150 is formed in the central portion of the peripheral portion 110, providing an empty space through which the airflow generated by the fan 200 passes to blow air. A motor mounted on the shaft of the fan 200 is housed and supported in a hub portion 151 located at the center of the air vent 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 the two opposite ends of the fixing members 152 are respectively connected to the inner peripheral edge of the peripheral portion 110 and the outer peripheral edge of the hub portion 151. In this case, the thickness of the peripheral portion 110 can be substantially greater than the thickness of the planar portion 120 to increase the width of the inner peripheral edge of the peripheral portion 110 connected to the fixing member 152, thereby ensuring appropriate rigidity by increasing the width of the fixing member 152. That is, as in Figure 1As clearly shown in the enlarged view at the lower side, when viewed from the surface of the planar portion 120, the peripheral portion 110 protrudes, and the lateral surface of the peripheral portion 110 is visible. Figure 1 In the enlarged view, 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] Simultaneously, significant noise inevitably occurs during the forced airflow process of the fan. More specifically, generally, noise with a pulsating waveform occurs as fluid conveyed by the fluid transport blades in the fluid machine passes through the cut-off section of the fluid machine. This pulsating waveform has a frequency that is the product of the number of blades and the rotational speed. This noise is called blade passage frequency (BPF) noise. The blades of fan 200 correspond to the fluid transport blades, while the ventilation port 150 corresponds to the cut-off section. When fan 200 is operating, BPF noise is significant even within the fan shroud assembly.

[0006] Various studies have been conducted to improve the shape or structure of fan shrouds to reduce BPF noise. As an example, Korean Patent Publication No. 2013-0111744 (“Fan Shroud for Noise Reduction,” October 11, 2013) discloses a fan shroud that, as... Figure 1 The diagram shows a plurality of elongated holes and a plurality of short holes arranged closer to the outer peripheral edge of the peripheral portion 110 and forming 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 through the ventilation port 150. However, considering the structure, since the holes formed in the fan shroud correspond to a defect, there is a risk that the holes may degrade the rigidity and durability of the fan shroud.

[0007] In another example presented in “Reducing BPF Noise Radiation from Engine Cooling Fan” (Yoshida K. et al., SAE World Congress and Exhibition 2014, April 1, 2014), an attempt has been made to reduce BPF noise by changing the shape of the fan shroud. Figure 2 This is an implementation method that modifies the shape of the fan shroud to reduce BPF noise based on research into related technologies. For example... Figure 1 and Figure 2 As shown in the upper figure, a typical fan shroud is shaped such that the planar portion 120 is formed into an approximately rectangular shape corresponding to the shape of the heat exchanger core, and a peripheral portion 110 is formed on the central portion of the planar portion 120. It is known that when the portion with a small gap between the fan blades and the fan shroud of the fan 200 is referred to as the narrow portion, a significant amount of BPF noise occurs in this narrow portion. For example... Figure 2 As shown in the following figure, Figure 2 The study shown creates an additional airflow space in the narrow section along the direction of fan 200 rotation, thus providing a shape change for reducing BPF noise by widening the narrow section. However, concerningly, this shape change results in an asymmetrical shape for the fan shroud, leading to undesirable vibrations that degrade the rigidity and durability of the fan shroud and its assembly. Furthermore, the unwanted vibrations cause new vibration noise. Additionally, because the additional airflow space protrudes from the existing fan shroud shape, it inevitably interferes with surrounding components during the assembly of the cooling module and application of the vehicle package.

[0008] [Related Technical Documents]

[0009] [Patent Literature]

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

[0011] [Non-patent literature]

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

[0013] Technical issues

[0014] Therefore, the present invention has been dedicated to solving the above-mentioned problems in the related art, and the object of the present invention is to provide a fan shroud assembly in which baffles are selectively disposed in some sections between a plurality of fixed members disposed in the ventilation ports of the fan shroud, thereby reducing the degradation of the rigidity and durability of the fan shroud and effectively reducing BPF noise.

[0015] Technical solution

[0016] To achieve the above objectives, the present invention provides a fan shroud assembly comprising: a fan 200 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; and a fan shroud including: a peripheral portion 110 configured to surround the outer periphery of the fan 200; a planar portion 120 configured to face a heat exchanger; and a ventilation port 150 formed in the central portion of the peripheral portion 110 and configured to allow airflow generated by the fan 200 to pass through the ventilation port to blow air. A hub portion 151 is formed at the center of the ventilation port 150 and configured to house and support a motor mounted on the shaft of the fan 200; and a plurality of 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 and are arranged radially around the hub portion 151. When the space between the plurality of fixing members 152 is referred to as a unit ventilation space 155, a noise reduction device is provided in at least one of the plurality of unit ventilation spaces 155 to control a portion of the airflow passing through the ventilation port. In this case, the noise reduction device may be a baffle 10 that blocks a portion of the outer peripheral edge side of the unit ventilation space 155.

[0017] Furthermore, the baffle 10 can be formed such that one end is disposed in the unit ventilation space 155 and connected to the inner peripheral edge of the peripheral portion 110, and its two opposite ends are connected to a pair of fixing members 152 defining two opposite boundaries of the unit ventilation space 155. In addition, the other end of the baffle 10 can be formed in a straight line shape parallel to the normal direction at the outermost point of one end.

[0018] In addition, baffles 10 can be installed in a pair of unit ventilation spaces 155 arranged to face each other.

[0019] In this case, the fan shroud 100 can be configured such that the extension line defined by a pair of unit ventilation spaces 155 is inclined relative to the vertical and horizontal directions, the pair of unit ventilation spaces 155 being arranged to face each other and having baffles 10 respectively disposed therein.

[0020] Furthermore, the fan shroud 100 can be configured such that the angle of the extension line relative to the vertical direction is smaller than the angle of the extension line relative to the horizontal direction.

[0021] Furthermore, the fan shroud 100 can be configured such that the baffle 10 is arranged in a unit ventilation space 155 adjacent to the upper narrow portion and the lower narrow portion, which are arranged to overlap with the circular shape of the peripheral portion 110 and the rectangular shape of the planar portion 120.

[0022] Furthermore, the fan shroud 100 can be configured such that the extension lines are inclined in a direction opposite to the rotation direction of the fan 200.

[0023] Furthermore, when the maximum distance between two opposite ends is called the baffle length l and the maximum distance between one end and the other end is called the baffle width w, the baffle 10 can be formed such that the ratio of the baffle width w to the baffle length l is in the range of 10% to 20%.

[0024] More specifically, the baffle 10 can be configured such that the ratio of the baffle width w to the baffle length l can be in the range of 10.9% to 16.4%.

[0025] Furthermore, baffles 10 can be disposed in a pair of unit ventilation spaces 155 arranged to face each other, and the baffle width w of the baffle 10 disposed on the upper side is larger than the baffle width w of the baffle 10 disposed on the lower side.

[0026] More specifically, baffles 10 can be disposed in a pair of unit ventilation spaces 155 arranged to face each other. The baffle width w of the baffle 10 disposed on the upper side can be set to the maximum value within the range of the ratio of baffle width w to baffle length l, and the baffle width w of the baffle 10 disposed on the lower side can be set to the minimum value within the range of the ratio of baffle width w to baffle length l.

[0027] Beneficial effects

[0028] According to the present invention, baffles are selectively disposed in certain sections between a plurality of fixed members arranged in the ventilation port of the fan shroud, thereby effectively reducing BPF noise. More specifically, in the present invention, baffles serving as a barrier to block a portion of the airflow blown to the outer peripheral edge side of the ventilation port are disposed in certain sections selected from the sections between the plurality of fixed members arranged in the ventilation port of the fan shroud, in order to properly control the airflow, thereby effectively reducing BPF noise by reducing interference between the air and the periphery of the peripheral structure serving as the ventilation port.

[0029] In related technologies, the configuration of forming holes in the fan shroud for additional air discharge to control airflow is widely used to reduce BPF noise. However, considering the structure, the holes formed in the fan shroud act as a defect, thus degrading the rigidity and durability of the fan shroud. However, according to the present invention, components such as holes that act as defects are not provided, and baffles are further provided between the fixing members, thereby improving structural rigidity. That is, in general, the present invention can reduce noise and completely eliminate the risk of degradation of the rigidity and durability of the fan shroud.

[0030] Furthermore, in related technologies, additional airflow space is formed in narrow sections to reduce BPF noise, but this 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

[0031] Figure 1 This is a 3D view of a fan shroud assembly in related technologies.

[0032] Figure 2 This is a diagram illustrating an implementation of changing the shape of the fan shroud to reduce BPF noise in related technologies.

[0033] Figure 3 This is a perspective view of the fan guard assembly of the present invention.

[0034] Figure 4 This is a front view of the fan guard assembly of the present invention.

[0035] Figure 5 This is an enlarged view of the lower baffle.

[0036] Figure 6 This is an enlarged view of the upper baffle.

[0037] Figure 7 This is a graph showing a comparison between the noise reduction effects obtained by the baffle of the present invention.

[0038] Figure 8 This is a graph showing the results of experiments used to obtain the optimal shape of the baffle of the present invention.

[0039] Description of reference numerals in the attached figures

[0040] 100: Fan shield

[0041] 110: Peripheral part, 120: Planar part

[0042] 150: Ventilation port

[0043] 151: Hub section; 152: Fixing component

[0044] 155: Unit ventilation space

[0045] 10: Baffle Detailed Implementation

[0046] 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.

[0047] Figure 3 This is a perspective view of the fan guard assembly of the present invention. Figure 4 This is a front view of the fan shroud assembly of the present invention. Figure 3 and Figure 4 As shown, the fan shroud assembly of the present invention essentially includes a fan 200 and a fan shroud 100. The basic shapes of the fan and the fan shroud will be briefly described. The fan 200 includes a hub coupled to a rotating shaft of a motor and a plurality of blades disposed on the outer peripheral surface of the hub. Furthermore, the fan shroud 100 includes: a peripheral portion 110 configured to surround the outer periphery of the fan 200; a planar portion 120 configured to face a heat exchanger; a ventilation port 150 provided in the form of an empty space formed in the 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 the center of the ventilation port 150 and configured to receive and support a motor disposed on the shaft of the fan 200; and a plurality of fixing members 152 connected to the inner peripheral edge of the peripheral portion 110 and the outer peripheral edge of the hub portion 151 and disposed radially around the hub portion 151.

[0048] In this case, when the space between the plurality of fixed members 152 is referred to as the unit ventilation space 155, the fan shroud 100 of the present invention has a noise reduction device disposed in at least one of the plurality of unit ventilation spaces. More specifically, in the present invention, the noise reduction device is a baffle 10 that blocks a portion of the outer peripheral edge side of the unit ventilation space 155. The baffle 10 controls a portion of the airflow passing through the ventilation port 150, thereby reducing BPF noise caused by the airflow. That is, when a portion of the airflow is deformed by the baffle 10 as described above, the shape of the airflow that causes BPF noise can be changed from the original airflow, which makes it possible to reduce BPF noise.

[0049] In related technologies, the configuration of forming holes in the fan shroud for additional air discharge to control airflow is widely used to reduce BPF noise. However, considering the structure, the holes formed in the fan shroud act as a defect, thus degrading the rigidity and durability of the fan shroud. Conversely, in this invention, a configuration is provided in which noise reduction devices are further disposed in the unit ventilation space 155, allowing for the substantial exclusion of components corresponding to this defect and improving structural rigidity. Furthermore, in Figure 2 In the related technologies shown, the additional airflow space results in an overall asymmetrical shape, which leads to interference with surrounding components. In contrast, in this invention, noise reduction devices are additionally provided between the originally existing structures, eliminating the need for protruding structures and substantially eliminating the aforementioned problems. In other words, overall, this invention can reduce noise and completely eliminate the risk of deterioration in the rigidity and durability of the fan shroud.

[0050] In this invention, as described above, the noise reduction device can be provided in the form of a baffle 10 on a portion of the outer peripheral edge of the ventilation space 155 of the blocking unit. That is, more specifically, the baffle 10 is provided in the form of a plate disposed between the fixing members 152.

[0051] The specific shape of the baffle 10 will be described in more detail below.

[0052] As described above, the baffle 10 is disposed in the selected unit ventilation space 155 to block a portion of the unit ventilation space 155. More specifically, as Figure 4 As clearly shown, the baffle 10 is formed such that one end of it is disposed in the unit ventilation space 155 and connected to the inner peripheral edge of the peripheral portion 110, and its two opposite ends are connected to a pair of fixing members 152 that define two opposite boundaries of the unit ventilation space 155.

[0053] One end of the baffle 10 is formed as a curve corresponding to the inner peripheral edge of the peripheral portion 110, i.e., it is formed as part of the periphery. As described above, the baffle 10 is formed as part of the outer peripheral edge side of the blocking unit ventilation space 155. All unit ventilation spaces 155 are collected and define the ventilation port 150. The outer peripheral edge of the ventilation port 150 substantially coincides with the inner peripheral edge of the peripheral portion 110. In this case, the ventilation port 150 is a portion provided in the form of an empty space, and the peripheral portion 110 is the actual component. Therefore, considering the above configuration, one end of the baffle 10 is described as being connected to the "inner peripheral edge of the peripheral portion 110".

[0054] The other end of the baffle 10 can be formed as part of the periphery to correspond to one end of the baffle 10. However, in order to improve manufacturability and maximize the area of ​​airflow obstruction, the baffle can be formed in a straight line shape parallel to the normal direction at the outermost point of one end.

[0055] At the same time, Figure 4 In the embodiment described above, the fixing member 152 of the fan shroud 100 has a curved shape, such that when viewed from the front, the two opposite ends of the baffle 10 are partially covered by the curved shape. This configuration will be described in more detail below with reference to enlarged views.

[0056] The optimal arrangement of baffle 10 will be described in more detail below.

[0057] Because the baffle 10 is formed in the shape described above, it can control airflow by blocking a portion of the outer peripheral edge of the unit ventilation space 155. In this case, the BPF noise reduction effect naturally varies depending on the location of the baffle 10. Therefore, it is necessary to correctly position the baffle 10 in the appropriate location.

[0058] from Figure 4 As can be seen from the front view, the peripheral portion 110 of the fan shroud 100 defines an approximately circular shape, and the planar portion 120 defines 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. An air vent 150 is formed in the central portion of the peripheral portion 110, and the planar portion 120 faces the heat exchanger. A relatively large amount of air is accumulated and collected on the portions where the circular shape defined by the peripheral portion 110 and the rectangular shape defined by the planar portion 120 overlap or are arranged adjacent to each other, causing a large amount of air to flow in a relatively narrow area, which results in BPF noise.

[0059] As described above, the baffle 10 reduces BPF noise by altering a portion of the airflow through a portion of the unit ventilation space 155. Therefore, the baffle 10 can be positioned at this location. Furthermore, when the baffle 10 is positioned where BPF noise reduction is not significant, only an unnecessarily reduced airflow toward the ventilation port 150 occurs. Therefore, it is unnecessary to install an excessive number of baffles 10.

[0060] Taking these factors into consideration, such as Figure 4 As shown, a pair of baffles 10 can be disposed in a pair of unit ventilation spaces 155 arranged facing each other. In this case, as Figure 4 As clearly shown, the extension line defined by a pair of unit ventilation spaces 155 arranged facing each other and having baffles 10 respectively disposed therein can be inclined relative to both the vertical and horizontal directions. More specifically, the angle of the extension line relative to the vertical direction can be smaller than the angle of the extension line relative to the horizontal direction.

[0061] The optimal arrangement of the baffle 10 will now be described visually. As described above, the fan shroud 100 is generally formed by combining the circular shape of the peripheral portion 110 and the rectangular shape of the planar portion 120. The maximum amount of air is collected in the upper and lower narrow portions where the circular shape of the peripheral portion 110 and the rectangular shape of the planar portion 120 overlap. It is known that the maximum amount of BPF noise occurs in these portions. Therefore, in this invention, the fan shroud 100 can be most preferably configured such that the baffle 10 is disposed in the unit ventilation space 155 arranged adjacent to the upper and lower narrow portions.

[0062] However, in this case, to properly achieve the BPF noise reduction effect, the airflow needs to be altered before the air passes through the upper and lower narrow sections. Therefore, the fan shroud 100 can be configured such that the extension line is inclined in the opposite direction to the rotation direction of the fan 200.

[0063] The optimal shape of the baffle 10 will be described in more detail below.

[0064] According to the description of the shape of the baffle 10, one end and the two opposite ends, i.e., the three ends, of the baffle 10 are respectively connected to the inner peripheral edge of the peripheral portion 110 and a pair of fixing members 152. In this case, the peripheral portion 110 is also formed in a circularly curved shape, the fixing members 152 are also formed in a curved shape, and the plurality of fixing members 152 are arranged radially. Therefore, the distance between the two opposite ends of the baffle 10 and the distance between one end and the other end of the baffle 10 are not determined as a single value. In order to determine the reference shape while taking these factors into account, the maximum distance between the two opposite ends of the baffle 10 is called the baffle length l, and the maximum distance between one end and the other end of the baffle 10 is called the baffle width w. Figure 5 and Figure 6 These are enlarged views of the lower baffle and the upper baffle, respectively. The portion of the baffle 10 covered by the fixed member 152 with a curved shape is indicated by dashed lines, and the baffle width w and baffle length l are clearly shown in the figures.

[0065] Figure 7 This is a graph comparing the noise reduction effects obtained through the baffle of the present invention. Figure 7 The upper graph shows the results of measuring the noise level L (dB) relative to the frequency f (Hz) in a fan shroud without a baffle in the related art, and the lower graph shows the results of measuring the noise level L (dB) relative to the frequency f (Hz) in the fan shroud of the present invention with a baffle, and illustrates an experimental result for finding the optimal implementation. In the related art, the first peak value is 68.9 dB. Conversely, in the present invention, the first peak value is 64.7 dB, and therefore, from Figure 7 It can be confirmed that there is an effect of reducing BPF noise by 4.2 dB. Meanwhile, O / A noise in noise analysis refers to the noise obtained by summing the peak values, such as those in the curves above. From... Figure 7 The graphs clearly show that, as is well known, the first peak significantly affects O / A noise. Based on the analysis of the results shown in the upper and lower graphs, it can be determined that, compared to related technologies, this invention provides a 0.4 dB reduction in total noise (i.e., O / A noise) by effectively reducing BPF noise (i.e., the first peak).

[0066] Figure 8 This is a graph showing the results of experiments used to obtain the optimal shape of the baffle of the present invention. For example... Figure 4 As shown, Figure 8The experiment was conducted by measuring the reduction in BPF noise while changing the baffle width w and baffle length l with the baffle 10 in its optimal arrangement. In this case, since the baffle length l is a fixed value (the spacing between the fixing members 152 is fixed), the experiment can be considered as being conducted by substantially changing the baffle width w. That is, Figure 7 The experimental results shown in the lower curve in the figure were obtained by changing the width w of the baffle, and Figure 8 The graph in the figure shows the first peak of the experimental results.

[0067] like Figure 8 As clearly shown in the graph, it can be determined that the noise reduction effect gradually increases as the ratio of the baffle width w to the baffle length l increases, remaining constant within any given segment. Then, the noise reduction effect decreases after that segment. In other words, physically, this can be determined as follows: As the baffle width w increases, the effect of reducing BPF noise gradually increases by altering the airflow. When any given segment is reached, the noise reduction effect remains stable without significant fluctuations. When the baffle width w increases further in that segment, the noise reduction effect decreases considerably due to the adverse effects of excessive airflow obstruction.

[0068] Reference Figure 8 The graph shows that when the overall BPF noise reduction effect fluctuates within 100%, a noise reduction effect of approximately 90% occurs when the ratio of baffle width w to baffle length l is between 10% and 20%. Therefore, within this range, the ratio of baffle width w to baffle length l is appropriate. Meanwhile, as... Figure 8 As clearly shown, the present invention provides a distinct critical section. Specifically, the critical section is in the range of 10.9% to 16.4%. That is, the BPF noise reduction effect can be maximized when the ratio of the baffle width w to the baffle length l is set in the range of 10.9% to 16.4%.

[0069] At the same time, from Figure 8As can be seen, when the ratio of the baffle width w to the baffle length l is within the critical range, the effect of reducing BPF noise remains almost the same even if the baffle width w changes. In this case, the noise reduction effect can certainly increase with the increase of the baffle width w. However, the problem is that the amount of air blown through the ventilation port 150 is slightly reduced. Taking these factors into account, the baffle width w can be minimized to prevent loss of airflow velocity. Meanwhile, the fixing members 152 connected to the two opposite ends of the baffle 10 are basically used to fix the hub portion 151. Therefore, it is obvious that the fixing members 152 arranged above the hub portion 151 receive the force used to pull the fixing members 152 by the weight of the hub portion 151. This effect can concentrate stress on the connection between the fixing members 152 and the peripheral portion 110. In this case, when the baffle 10 arranged on the upper side is placed between the fixing members 152, the stress concentration can be reduced to a certain extent, which helps to improve the overall rigidity of the fan shroud 100. In other words, taking these factors into account, when the baffle 10 is positioned on the upper side, the width w of the baffle can be maximized to improve rigidity.

[0070] As in Figure 4 In the optimal arrangement, when baffles 10 are positioned in a pair of unit ventilation spaces 155 arranged facing each other, considering the two factors mentioned above (i.e., preventing airflow loss and improving rigidity), the baffle width w of the upper baffle 10 can be larger than the baffle width w of the lower baffle 10. More specifically, the baffle width w of the upper baffle 10 can be set to the maximum value within the range of the ratio of baffle width w to baffle length l to maximize the effect of improving rigidity. The baffle width w of the lower baffle 10 can be set to the minimum value within the range of the ratio of baffle width w to baffle length l to maximize the effect of preventing airflow loss.

[0071] 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.

[0072] Industrial applicability

[0073] 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 configured to face a heat exchanger; a ventilation port formed in a central portion of the peripheral portion and configured to allow airflow generated by the fan to pass through the ventilation port for blowing air; a hub portion disposed at the center of the ventilation port and configured to house and support a motor mounted on a 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. Wherein, when the space between the plurality of fixed components is referred to as a unit ventilation space, a noise reduction device is installed in at least one unit ventilation space selected from the plurality of unit ventilation spaces to control a portion of the airflow passing through the ventilation port. The noise reduction device is a baffle that blocks a portion of the outer peripheral edge of the unit's ventilation space. The baffle is configured such that one end of the baffle is disposed in the unit ventilation space and connected to the inner peripheral edge of the periphery, and the two opposite ends of the baffle are connected to a pair of fixing members that define two opposite boundaries of the unit ventilation space.

2. The fan shroud assembly according to claim 1, wherein, The other end of the baffle is formed in the shape of a straight line parallel to the normal direction at the outermost point of one end.

3. The fan shroud assembly according to claim 1, wherein, The baffles are arranged in a pair of unit ventilation spaces that are positioned to face each other.

4. The fan shroud assembly according to claim 3, wherein, The fan shroud is formed such that the extension line defined by the pair of unit ventilation spaces is inclined relative to the vertical and horizontal directions, the pair of unit ventilation spaces being arranged to face each other and having baffles respectively disposed in the pair of unit ventilation spaces.

5. The fan shroud assembly according to claim 4, wherein, The fan shroud is formed such that the angle of the extension line relative to the vertical direction is smaller than the angle of the extension line relative to the horizontal direction.

6. The fan shroud assembly according to claim 4, wherein, The fan shroud is formed such that the baffle is arranged in the unit ventilation space adjacent to the upper narrow portion and the lower narrow portion, which are configured to overlap with the circular shape of the peripheral portion and the rectangular shape of the planar portion.

7. The fan shroud assembly according to claim 4, wherein, The fan shroud is formed such that the extension line is inclined in a direction opposite to the rotation direction of the fan.

8. The fan shroud assembly according to claim 1, wherein, When the maximum distance between the two opposite ends is called the baffle length and the maximum distance between one end and the other end is called the baffle width, the baffle is formed such that the ratio of the baffle width to the baffle length is in the range of 10% to 20%.

9. The fan shroud assembly according to claim 8, wherein, The baffle is formed such that the ratio of the baffle width to the baffle length is in the range of 10.9% to 16.4%.

10. The fan shroud assembly according to claim 8 or 9, wherein, The baffles are arranged in a pair of unit ventilation spaces facing each other, and the baffle width of the baffle located on the upper side is greater than the baffle width of the baffle located on the lower side.

11. The fan shroud assembly according to claim 8 or 9, wherein, The baffles are arranged in a pair of unit ventilation spaces facing each other. The width of the baffle located on the upper side is set to the maximum value within the range of the ratio of the baffle width to the baffle length, and the width of the baffle located on the lower side is set to the minimum value within the range of the ratio of the baffle width to the baffle length.

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