Protective device for a heat sink and cooling module

Abstract

The utility model relates to vehicle technical field, specifically disclose a heat radiator is with protection device and cooling module. The heat radiator includes the heat dissipation fin, the heat radiator is with protection device including sand prevention spare and a plurality of connecting components, sand prevention spare installs on the heat radiator, sand prevention spare includes sand prevention part and frame, the frame is surrounded in the outer periphery of sand prevention part, and the frame is equipped with a plurality of through -holes in the circumference, a plurality of connecting components with through -hole one -to -one setting, every connecting component includes fastener and locking piece, the head portion of fastener abuts at the frame, and the stem portion passes through through -hole and the back of adjacent two heat dissipation fins after with locking piece links to each other in proper order, and locking piece can abut at the back of adjacent two heat dissipation fins. The scheme of fixing sand prevention spare directly on the heat radiator can effectively protect the heat radiator, improve the reliability of cooling module heat dissipation and operation, and need not change the original structure of heat radiator, reduce the manufacturing and development cost, in addition, simple structure, lighter weight, convenient to assemble.

Description

Technical Field

[0001] This utility model relates to the field of vehicle technology, and in particular to a protective device and cooling module for radiators. Background Technology

[0002] The cooling module is a core component of a vehicle's cooling system, with the high-temperature radiator playing a crucial role in heat dissipation. Fans are typically installed on the front or back of the radiator—the side facing the external environment and the back facing the interior of the system—to draw in air and blow it across the radiator, accelerating heat dissipation. When vehicles travel in extreme environments such as deserts, the cooling module's fans can draw in sand and gravel from the surrounding environment. Driven by the high-speed airflow, this sand and gravel are drawn into the cooling module, directly impacting the radiator's fins and tubes, easily causing fin wear and even coolant leakage, severely affecting the cooling module's heat dissipation performance and operational stability.

[0003] To protect the radiator, a sand screen is usually added to the front of the radiator to block sand and prevent it from impacting the radiator. Since the sand screen is added during desert road tests in the later stages of the vehicle verification of the cooling module, for high-temperature radiators with wider cores, the sand screen can only be fixed to the fixing points of the cooling module fan. Based on the structure of the cooling module frame, the sand screen is usually fixed to a rectangular metal frame and then connected to the cooling module frame through the metal frame. This structure will increase the overall weight of the cooling module by more than 5kg, putting a significant load on the cooling module. In addition, the cooling module frame needs to be additionally processed to fit the metal frame, increasing manufacturing costs and assembly complexity.

[0004] Therefore, there is an urgent need to propose a protective device and cooling module for radiators to solve the above-mentioned technical problems. Utility Model Content

[0005] According to one aspect of the present invention, a protective device for a radiator is provided, which can resist sand and gravel, effectively protect the radiator, improve the heat dissipation and operational reliability of the cooling module, has a simple and compact structure, is lightweight, is easy to assemble, and does not require modification of the original structure of the radiator, thus reducing manufacturing and R&D costs.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A protective device for a radiator, the radiator including heat dissipation fins, the protective device for the radiator comprising:

[0008] A sandproof component is installed on the radiator. The sandproof component includes a sandproof part and a frame. The frame surrounds the outer periphery of the sandproof part and has multiple through holes in the circumferential direction.

[0009] Multiple connecting components are provided in a one-to-one correspondence with the through holes. Each connecting component includes a fastener and a locking member. The fastener includes a head and a rod connected to the head. The head abuts against the frame. The rod passes through the through hole and between two adjacent heat dissipation fins in sequence and is connected to the locking member. The locking member can abut against the back of two adjacent heat dissipation fins.

[0010] Optionally, the sand-proof part includes a sand-proof net, the sand-proof net is made of metal, the frame is made of plastic material, and the frame and the sand-proof net are processed by insert injection molding.

[0011] Optionally, a limiting rib is provided between two opposite sides of the frame, and the limiting rib is connected to the sand-proof net.

[0012] Optionally, the end of the rod away from the head is provided with a snap-fit ​​part, and the locking member is provided with a snap-fit ​​hole, which snaps into the snap-fit ​​part.

[0013] Optionally, the latching portion includes an umbrella-shaped spring arm disposed at one end of the rod portion away from the head. The umbrella-shaped spring arm can elastically retract under the compression of the latching hole to pass through the latching hole, and after passing through the latching hole, it elastically expands to abut against the outer edge of the latching hole.

[0014] Optionally, the rod has a retaining portion on its peripheral wall, which elastically presses against two adjacent heat dissipation fins to prevent the rod from disengaging from the locking member.

[0015] Optionally, the anti-reverse portion has an umbrella-shaped structure, with the open end of the umbrella-shaped structure facing the head;

[0016] And / or, the anti-reverse portion is provided in multiple ways, and the multiple anti-reverse portions are spaced apart along the axial direction of the rod portion.

[0017] Optionally, the fastener is made of a plastic material; and / or, the locking element is made of a plastic material.

[0018] According to another aspect of the present invention, a cooling module is also provided, including a radiator and a radiator protection device as described in any of the above technical solutions, wherein the radiator protection device is fixedly installed on the heat dissipation fins of the radiator.

[0019] Optionally, a fan is provided on the front and / or back of the heat sink;

[0020] The protective device for the radiator is installed on the heat dissipation fins on the front of the radiator. The sand-proof part has a ring or quarter-ring structure and is arranged corresponding to the fan blades.

[0021] The beneficial effects of this utility model are as follows:

[0022] This utility model provides a protective device for radiators, including a sand-proof component and multiple connecting assemblies. The sand-proof component includes a sand-proof section and a frame, and each connecting assembly includes a fastener and a locking component. The connecting assemblies install the sand-proof component on the radiator, protecting the radiator through the sand-proof function of the sand-proof section. This reduces the risk of wear on the radiator fins and flat tubes due to sand and gravel impact, and even coolant leakage, thus improving the radiator's heat dissipation performance and operational stability.

[0023] Furthermore, the fastener's shank passes sequentially through the through-holes on the frame and between two adjacent heat dissipation fins before connecting to the locking mechanism, allowing the fastener head and locking mechanism to secure the sand-proof component to the radiator. This installation method utilizes the gaps between the heat dissipation fins. On one hand, compared to the installation method where the metal frame is connected to the side frame of the radiator, the structure is simpler and more compact, significantly reducing the overall weight of the device. On the other hand, it does not require modification of the original radiator structure, reducing manufacturing and R&D costs. Moreover, it is easy to assemble and can be installed in any position on the radiator as needed, offering high flexibility in use.

[0024] This utility model also provides a cooling module, including a radiator and the aforementioned radiator protection device. Due to the use of the aforementioned radiator protection device, the cooling module exhibits significantly reduced load-bearing capacity and higher heat dissipation performance and operational stability. Attached Figure Description

[0025] Figure 1 An assembly diagram of a radiator protective device and a radiator from one perspective, provided for an embodiment of this utility model;

[0026] Figure 2 An exploded view of the radiator protection device and radiator from another perspective provided for an embodiment of this utility model;

[0027] Figure 3 A cross-sectional view of the assembly drawing of the radiator protective device and the radiator provided in the embodiment of this utility model;

[0028] Figure 4 for Figure 3 A magnified view of a portion at point A.

[0029] In the picture:

[0030] 10. Radiator; 11. Heat dissipation fins;

[0031] 100. Sandproof component; 110. Sandproof section; 120. Frame; 121. Through hole; 130. Limiting rib;

[0032] 200. Connecting component; 210. Fastener; 211. Head; 212. Rod; 2121. Anti-reverse part; 213. Snap-fit ​​part; 2131. Umbrella-shaped spring arm; 220. Locking element; 221. Snap-fit ​​hole. Detailed Implementation

[0033] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0034] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Moreover, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] In this invention, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this invention, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0037] In this utility model, "multiple" refers to two or more (including two).

[0038] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0039] This embodiment provides a protective device for a radiator that can resist sand and gravel, effectively protecting the radiator, improving the heat dissipation and operational reliability of the cooling module, and without requiring changes to the original structure of the radiator, thus reducing manufacturing and R&D costs; in addition, it has a simple structure, is lightweight, and is easy to assemble.

[0040] like Figures 1-3 As shown, the protective device for the radiator is used for a finned radiator, that is, the radiator 10 includes a plurality of heat dissipation fins 11. Since the structure of the finned radiator is existing technology, its specific structure will not be described in detail.

[0041] Specifically, see [link to relevant documentation] Figures 1-3 The protective device for the radiator includes a sandproof component 100 and multiple connecting components 200.

[0042] The sandproof component 100 is installed on the radiator 10. The sandproof component 100 includes a sandproof part 110 and a frame 120. The frame 120 surrounds the outer periphery of the sandproof part 110 and has multiple through holes 121 circumferentially. Multiple connecting components 200 are correspondingly arranged with the through holes 121. Each connecting component 200 includes a fastener 210 and a locking member 220. The fastener 210 includes a head 211 and a rod 212 connected to the head 211. The head 211 abuts against the outer surface of the frame 120 for limiting position and bearing pressure. After the rod 212 passes through the through hole 121 and between two adjacent heat dissipation fins 11 in sequence, it finally extends out of the heat dissipation fin 11 and connects with the locking member 220. The locking member 220 can abut against the back of the heat dissipation fin 11. That is, the locking member 220 and the head 211 can clamp the frame 120 and the heat dissipation fin 11 to reliably fix the sandproof member 100 on the radiator 10.

[0043] Understandably, the sand-proof section 110 has a sand-proof function. When the vehicle is driving in environments such as deserts, most of the sand and gravel will be blocked outside the radiator 10 by the sand-proof section 110, preventing the sand and gravel from contacting the radiator 10. A small portion of the sand and gravel that passes through the sand-proof section 110 will have its speed greatly reduced due to the blocking effect of the sand-proof section 110, and the impact force on the radiator 10 will be greatly reduced. This will reduce the risk of sand and gravel wear on the heat dissipation fins 11 and the radiator flat tubes, and improve the heat dissipation performance and operational stability of the radiator 10.

[0044] The connecting assembly 200 utilizes the gaps between the heat dissipation fins 11 and uses a clamping method to fix the sandproof component 100 to the radiator 10. On the one hand, it does not require changes to the original structure of the radiator 10, reducing manufacturing and R&D costs. On the other hand, compared with the installation method of connecting the metal frame to the frame on the side of the radiator 10, the structure is simple and compact, significantly reducing the overall weight of the device and the load on the radiator 10. Furthermore, it is easy to assemble and can be installed at any position on the radiator 10 as needed, providing high flexibility in use.

[0045] Optionally, in one possible embodiment, the sand-proof part 110 can be a sand-proof net, whose mesh structure can effectively block sand and gravel, while maintaining low airflow resistance and pressure drop, ensuring good heat dissipation effect of the radiator 10.

[0046] Alternatively, in another possible embodiment, the sand-proof section 110 may also be a honeycomb structure.

[0047] Optionally, since most of the impact force of sand and gravel is blocked by the sand-proof part 110, the material of the sand-proof part 110 should have high wear resistance to extend its service life.

[0048] Furthermore, in one possible embodiment, the sand-proof part 110 can be made of a metallic material, such as stainless steel wire or galvanized iron wire. In other embodiments, the sand-proof part 110 can also be made of a non-metallic fiber material, such as glass fiber, to balance wear resistance and lightweight. In other embodiments, the sand-proof part 110 can also be made of other materials with wear-resistant properties, depending on actual needs, and this application does not impose specific limitations.

[0049] Optionally, to further reduce the overall weight of the sandproof component 100, the frame 120 can be made of a high-temperature resistant plastic material, such as nylon, epoxy resin, or polypropylene glass fiber reinforced plastic. The heat distortion temperature of the aforementioned plastic material is not lower than 100°C, thereby ensuring the reliability and service life of the sandproof component 100. The hardness of the frame 120 is less than that of the heat dissipation fins 11, thus preventing the frame 120 from wearing down the heat dissipation fins 11.

[0050] Optionally, in one possible embodiment, the sand-proof net is made of metal, and the frame 120 is made of plastic material. The frame 120 and the sand-proof part 110 are manufactured by insert injection molding. See also Figure 1 With this configuration, the edge of the sandproof part 110 is completely wrapped inside the frame 120, forming an inseparable connection between the two. This enhances the overall protection and structural strength, and the structure is compact and easy to assemble.

[0051] Optionally, see [link to relevant documentation] Figure 1 A limiting rib 130 can be provided between the two opposite sides of the frame 120, and the limiting rib 130 is connected to the sand-proof net. Since the overall structure of the sand-proof net is relatively soft and prone to warping, the limiting rib 130 provided between the two opposite sides of the frame 120 can stop the sand-proof net and reduce the risk of warping. In addition, the setting of the limiting rib 130 can also enhance the overall structural strength of the sand-proof component 100, which is conducive to extending the service life of the sand-proof component 100.

[0052] Furthermore, one or more limiting ribs 130 can be provided, depending on actual needs. See also... Figure 1 In this embodiment, a limiting rib 130 is provided, and the limiting rib 130 is located in the middle of the frame 120. In another possible embodiment, multiple intersecting limiting ribs 130 can also be provided around the circumference of the frame 120, such as the limiting ribs 130 intersecting along the diagonal direction of the frame 120, or the limiting ribs 130 are arranged in both longitudinal and transverse directions to form a "grid" or "well-shaped" support structure. By adjusting the number and distribution of the limiting ribs 130, the support of the sand-proof part 110 can be effectively improved, preventing the sand-proof part 110 from bulging or deforming under the impact of strong airflow. In other possible embodiments, the number and arrangement of the limiting ribs 130 can also be other, depending on actual needs, and this application does not impose specific limitations.

[0053] Alternatively, multiple sandproof components 100 can be provided, and multiple sandproof components 100 can be arranged in a splicing manner at the location of the radiator 10 that needs protection, so as to take into account both lightweight and targeted protection.

[0054] Optionally, the protection levels of multiple sand-proof components 100 can be the same or different, depending on actual needs. Taking the above-mentioned sand-proof part 110 as a sand-proof net as an example, the mesh size of the sand-proof net of multiple sand-proof components 100 can be the same or different.

[0055] Alternatively, in one possible embodiment, the sandproof component 100 is fixed to the radiator 10 by four connecting components 200 to ensure basic fixation.

[0056] Alternatively, in another possible embodiment, six fasteners 210 may be used, evenly spaced along the circumferential intervals of the frame 120, so that the sandproof part 100 is subjected to more balanced force on the front of the radiator 10.

[0057] Alternatively, in other possible embodiments, eight or more fasteners 210 may be used, symmetrically arranged along the four sides of the frame 120, or evenly arranged at the four corner points and the midpoint of the side, to meet the protection requirements of large-size heat sinks and improve the overall fixing reliability between the sandproof part 100 and the heat sink 10.

[0058] Further, see Figure 3 and Figure 4 The rod 212 has a snap-fit ​​part 213 at the end away from the head 211, and the locking member 220 has a snap-fit ​​hole 221. The snap-fit ​​hole 221 snaps into the snap-fit ​​part 213, and the rod 212 and the locking member 220 are connected by snap-fit. The structure is simple and easy to install and disassemble.

[0059] Alternatively, in one possible embodiment, see [link to previous document]. Figure 3 and Figure 4 The locking part 213 includes an umbrella-shaped spring arm 2131 disposed at one end of the rod part 212 away from the head 211. When inserted into the locking hole 221, the umbrella-shaped spring arm 2131 can elastically close under the compression of the locking hole 221 to pass through the locking hole 221, and after passing through the locking hole 221, it elastically expands and abuts against the outer edge of the locking hole 221, thereby realizing the one-way locking of the fastener 210.

[0060] Alternatively, in another possible embodiment, the snap-fit ​​portion 213 may also be a claw-shaped structure or a barbed structure to adapt to different assembly requirements.

[0061] Further, see also Figure 3 and Figure 4 An anti-retraction part 2121 can also be provided on the peripheral wall of the rod 212. The anti-retraction part 2121 can elastically press against the space between two adjacent heat dissipation fins 11, thereby restricting the rod 212 from retracting.

[0062] Alternatively, in one possible embodiment, the stop portion 2121 may be an umbrella-shaped structure with its open end facing the head 211.

[0063] Alternatively, in another possible embodiment, the anti-retraction portion 2121 may also be a wedge-shaped protrusion or an annular flange.

[0064] Optionally, in one possible embodiment, the number of anti-reverse portions 2121 can be one, two, or more. When multiple anti-reverse portions 2121 are provided, they can be distributed at intervals along the axial direction of the rod portion 212 to further improve the anti-reverse effect.

[0065] Optionally, in one possible embodiment, the locking element 220 can be a plastic material, such as rubber, polyurethane, or nylon, to provide elastic cushioning and stable locking force during assembly and use. The heat distortion temperature of the plastic material used is not lower than 100°C to ensure lightweight and high-temperature resistance. The fastener 210 can also be made of the same material.

[0066] This embodiment also provides a cooling module, which includes a radiator 10 and the aforementioned radiator protection device. The radiator protection device is fixedly installed on the heat dissipation fins 11 of the radiator 10. Because this cooling module uses the aforementioned radiator protection device, it can effectively block the impact of sand and gravel on the heat dissipation fins 11, resulting in high heat dissipation performance and operational stability. Furthermore, it is easy to assemble and highly flexible in use.

[0067] Optionally, the cooling module also includes a fan disposed on the front and / or back of the radiator 10 for drawing air into the radiator 10.

[0068] It is understandable that the front of the radiator 10 is its windward side. When the fan is turned on, air will pass through the windward side of the radiator 10, be drawn into the radiator 10, and then exit from the back (leeward side) of the radiator 10. Therefore, in order to ensure the protection of the radiator 10, a protective device needs to be installed on the heat dissipation fins on the front of the radiator 10, so that the air first passes through the sandproof part 110 before entering the radiator 10.

[0069] Therefore, in one possible embodiment, a fan is provided on the front of the radiator 10, and a radiator protection device is located between the fan and the radiator 10. In another possible embodiment, a radiator protection device is provided on the front of the radiator 10, and a fan is provided on the back of the radiator 10. In other possible embodiments, fans are provided on both the front and back of the radiator 10, and the radiator protection device is located between the front of the radiator 10 and the fan located on the front.

[0070] Alternatively, for a scheme where the fan is mounted on the front of the radiator 10, a certain gap can be provided between the fan and the radiator protection device to avoid interference and wear between the fan and the radiator protection device during operation, which is beneficial to improving the stable operation and heat dissipation performance of the cooling module.

[0071] Optionally, in one possible embodiment, the sand-proof part 110 may be annular, and the annular sand-proof part 110 is positioned corresponding to the fan blades, which can comprehensively resist the sand and gravel sucked in when the fan is running, thereby achieving comprehensive protection for the radiator 10.

[0072] Alternatively, in another possible embodiment, the sand-proof section 110 may also be a quarter-circular annular structure, covering only a local area of ​​the radiator 10, for example... Figure 1 The lower right area shown is designed to specifically protect the most severely worn parts while also prioritizing weight reduction. In this embodiment, the sandproof section 110 weighs approximately 0.1 kg, significantly reducing the load on the radiator 10. Various partial coverage methods, such as lower left coverage or upper coverage, can also be configured as needed.

[0073] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A protective device for a radiator, said radiator (10) comprising heat dissipation fins (11), characterized in that, The protective device for the radiator includes: A sandproof component (100) is installed on the radiator (10). The sandproof component (100) includes a sandproof part (110) and a frame (120). The frame (120) surrounds the outer periphery of the sandproof part (110). The frame (120) has a plurality of through holes (121) in the circumferential direction. Multiple connecting components (200) are provided one-to-one with the through holes (121). Each connecting component (200) includes a fastener (210) and a locking member (220). The fastener (210) includes a head (211) and a rod (212) connected to the head (211). The head (211) abuts against the frame (120). The rod (212) passes through the through hole (121) and between two adjacent heat dissipation fins (11) in sequence and is connected to the locking member (220). The locking member (220) can abut against the back of two adjacent heat dissipation fins (11).

2. The protective device for a radiator according to claim 1, characterized in that, The sand-proof part (110) includes a sand-proof net, the sand-proof net is made of metal, the frame (120) is made of plastic material, and the frame (120) and the sand-proof net are processed by insert injection molding.

3. The protective device for a radiator according to claim 2, characterized in that, The frame (120) is provided with limiting ribs (130) between the two opposite sides, and the limiting ribs (130) are connected to the sand-proof net.

4. The protective device for a radiator according to any one of claims 1-3, characterized in that, The rod (212) has a snap-fit ​​part (213) at one end away from the head (211), and the locking member (220) has a snap-fit ​​hole (221) that snaps into the snap-fit ​​part (213).

5. The protective device for a radiator according to claim 4, characterized in that, The latching part (213) includes an umbrella-shaped spring arm (2131) disposed at one end of the rod part (212) away from the head (211). The umbrella-shaped spring arm (2131) can elastically close under the compression of the latching hole (221) to pass through the latching hole (221), and elastically open to abut against the outer edge of the latching hole (221) after passing through the latching hole (221).

6. The protective device for a radiator according to any one of claims 1-3, characterized in that, The rod (212) has a stop portion (2121) on its peripheral wall. The stop portion (2121) elastically presses against two adjacent heat dissipation fins (11) to prevent the rod (212) from disengaging from the locking member (220).

7. The protective device for a radiator according to claim 6, characterized in that, The anti-reverse part (2121) has an umbrella-shaped structure, and the open end of the umbrella-shaped structure faces the head (211); And / or, the anti-reverse portion (2121) is provided in multiples, and the multiple anti-reverse portions (2121) are spaced apart along the axial direction of the rod portion (212).

8. The protective device for a radiator according to any one of claims 1-3, characterized in that, The fastener (210) is made of plastic material; and / or the locking member (220) is made of plastic material.

9. A cooling module, characterized in that, It includes a radiator (10) and a radiator protection device according to any one of claims 1-8, wherein the radiator protection device is fixedly installed on the heat dissipation fins (11) of the radiator (10).

10. The cooling module according to claim 9, characterized in that, A fan is provided on the front and / or back of the radiator; The protective device for the radiator is installed on the heat dissipation fins on the front side of the radiator (10). The sand-proof part (110) has an annular or quarter-annular structure and is arranged corresponding to the fan blades.

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