A top cover assembly, an outdoor unit, and a control method.

Abstract

This invention provides a top cover assembly, an outdoor unit, and a control method. The top cover assembly includes a grille and a protective cover; the grille has multiple air guide strips spaced apart, forming air outlets between adjacent air guide strips; the protective cover includes a first cover and a second cover, the first cover having multiple circumferentially spaced ventilation holes, and the second cover being rotatably mounted relative to the first cover, used to connect the ventilation holes to the air outlets or to cover the air outlets. This invention's protective cover prevents snow from falling into the grille when the outdoor unit is in standby mode, avoiding safety and performance hazards. In addition to blocking snow and foreign objects from the grille, the protective cover can selectively open when the outdoor unit requires ventilation, connecting the ventilation holes to the air outlets to ensure normal operation of the outdoor unit, and can be flexibly adjusted according to the outdoor unit's operating status.

Description

Technical Field

[0001] This invention belongs to the field of outdoor unit technology, specifically relating to a top cover assembly, an outdoor unit, and a control method. Background Technology

[0002] Existing top-discharge outdoor units mostly use open-type air conditioning cover assemblies for exhaust ventilation. While this type of assemblies facilitates exhaust, they are not effective in preventing snow accumulation when the air conditioner is not used for extended periods during heavy snowfall, potentially posing safety and performance risks. Therefore, there is a need for a cover assembly that can prevent snow accumulation and automatically remove snow, while also opening when the outdoor unit is running and closing when it is not in use, based on the exhaust needs of the outdoor unit. Summary of the Invention

[0003] This invention provides a top cover assembly, an outdoor unit, and a control method, which can solve the technical problem that although existing open-type air conditioner top cover assemblies are beneficial for ventilation, they cannot effectively prevent snow accumulation when the air conditioner is not used for a long time in heavy snow.

[0004] This invention provides a top cover assembly, including a grille and a protective cover;

[0005] Multiple air guide strips are spaced apart on the grille, and air outlets are formed between adjacent air guide strips;

[0006] The protective cover includes a first cover and a second cover. The first cover has multiple ventilation holes spaced apart around its circumference. The second cover is rotatably arranged relative to the first cover and is used to connect the ventilation holes to the air outlet or to cover the air outlet.

[0007] In some embodiments, a plurality of first connecting ribs are spaced apart on the first cover, and ventilation holes are formed between adjacent first connecting ribs. A plurality of second connecting ribs are spaced apart on the second cover, and the second connecting ribs may overlap with the first connecting ribs or with the ventilation holes.

[0008] In some embodiments, a drive assembly is provided on the grille for driving the second cover to rotate relative to the first cover and the grille.

[0009] In some embodiments, the drive assembly includes a motor, a turntable, and a connecting rod disposed on the turntable. The motor is disposed on the grille, the output shaft of the motor is connected to the turntable, and both ends of the connecting rod are connected to a second cover.

[0010] In some embodiments, the second cover is disposed between the first cover and the grille, the first cover is provided with at least two clearance holes, the two ends of the connecting rod extend out of the clearance holes and connect to the second cover, and the two ends of the connecting rod can swing in the two clearance holes.

[0011] In some embodiments, a micro switch is provided on the grille, the protective cover can be moved away from the micro switch or pressed, and a heater is provided on the protective cover, the micro switch being used to turn the heater on or off.

[0012] The grid is equipped with an elastic element, one side of which is connected to the grid and the other side of which is connected to the protective cover.

[0013] In some embodiments, a controller is also included, which is electrically connected to the heater and the micro switch, and is used to start or stop the heater according to the trigger state of the micro switch.

[0014] An outdoor unit includes a top cover assembly, wherein the top cover assembly is as described above.

[0015] A method for controlling an outdoor unit, the method comprising:

[0016] The protective cover has two states depending on the operating status of the outdoor unit;

[0017] When the outdoor unit is in standby mode, the protective cover is in the first state, and the second cover covers the air outlet.

[0018] The outdoor unit is ready to start, the protective cover is in the second state, and the ventilation holes are connected to the air outlet.

[0019] In some embodiments, when an elastic element is provided on the grille and a heater is provided on the protective cover, the second state further includes:

[0020] When the total weight of the protective cover is less than the elastic force of the elastic element, the second cover rotates, and the ventilation holes connect with the air outlet.

[0021] When the total weight of the protective cover is greater than or equal to the elastic force of the elastic element, the heater first removes snow and ice. When the total weight of the protective cover is less than the elastic force of the elastic element, the heater stops working, the second cover rotates, and the ventilation hole connects with the air outlet.

[0022] The top cover assembly, outdoor unit, and control method provided by this invention have the following beneficial effects:

[0023] When the outdoor unit is in standby mode, no air flows from the air outlet, and the second cover does not need to rotate, as it blocks the air outlet. When the outdoor unit starts up, the grille needs to exhaust air, and the second cover rotates relative to the first cover, connecting the vent to the air outlet, allowing the outdoor unit to start normally. This invention's protective cover prevents snow from falling into the grille when the outdoor unit is in standby mode, avoiding safety and performance issues. Furthermore, besides blocking snow and foreign objects from entering the grille, the protective cover can selectively open when the outdoor unit needs ventilation, connecting the vent to the air outlet to ensure normal operation of the outdoor unit, allowing for flexible adjustment based on the outdoor unit's operating status. Attached Figure Description

[0024] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the top cover assembly according to an embodiment of the present invention;

[0026] Figure 2 This is a cross-sectional view of the top cover assembly according to an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the first cover body according to an embodiment of the present invention;

[0028] Figure 4 This is a top view of the first cover body according to an embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of the second cover body according to an embodiment of the present invention;

[0030] Figure 6 This is a top view of the second cover body according to an embodiment of the present invention;

[0031] Figure 7 for Figure 1 A magnified view of the details at point A in the middle.

[0032] Attached Figures: 1-Grate; 101-Air Guide Strip; 102-Third Sleeve; 2-Protective Cover; 21-First Cover Body; 211-Ventilation Hole; 212-First Connecting Rib; 213-Void Hole; 214-First Sleeve; 215-First Connecting Ring; 216-Bearing; 22-Second Cover Body; 221-Second Connecting Rib; 222-Second Sleeve; 223-Second Connecting Ring; 224-First Mounting Post; 225-Second Mounting Post; 3-Drive Assembly; 301-Motor; 302-Turntable; 303-Connecting Rod; 42-Elastic Component; 5-Fan Blade. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0035] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0036] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0037] See also Figure 1 and Figure 2As shown, according to an embodiment of the present invention, a top cover assembly is provided, the top cover assembly including a grille 1 and a protective cover 2; a plurality of air guide strips 101 are spaced apart on the grille 1, and an air outlet is formed between adjacent air guide strips 101; the protective cover 2 includes a first cover body 21 and a second cover body 22, the first cover body 21 is circumferentially spaced with a plurality of ventilation holes 211, the second cover body 22 is rotatably disposed relative to the first cover body 21, and the second cover body 22 is used to connect the ventilation holes 211 with the air outlet or cover the air outlet.

[0038] In this embodiment, when the outdoor unit is in standby mode, the air outlet does not emit air, and the second cover 22 does not need to rotate, as it blocks the air outlet. When the outdoor unit starts up, the grille 1 needs to exhaust air, and the second cover 22 rotates relative to the first cover 21, allowing the ventilation hole 211 to connect with the air outlet, enabling the outdoor unit to start normally. The protective cover 2 of this invention prevents snow from falling into the grille 1 when the outdoor unit is in standby mode, avoiding potential safety and performance issues. Furthermore, besides blocking snow and foreign objects from the grille 1, the protective cover 2 of this invention can selectively open when the outdoor unit needs to exhaust air, connecting the ventilation hole 211 with the air outlet to ensure the outdoor unit can operate normally, allowing for flexible adjustment based on the outdoor unit's operating status.

[0039] Combination Figures 3 to 6 As shown, a plurality of first connecting ribs 212 are spaced apart on the first cover 21, and ventilation holes 211 are formed between adjacent first connecting ribs 212. A plurality of second connecting ribs 221 are spaced apart on the second cover 22. The second connecting ribs 221 may overlap with the first connecting ribs 212 or with the ventilation holes 211. The width of the second connecting ribs 221 is the same as the width of the first connecting ribs 212 and the same as the width of the ventilation holes 211.

[0040] In this embodiment, when the outdoor unit is in standby mode, one second connecting rib 221 overlaps with one ventilation hole 211, meaning that multiple second connecting ribs 221 cover multiple ventilation holes 211. At this time, the first connecting ribs 212 and the second connecting ribs 221 are staggered, and the protective cover 2 is in a closed state. External snow and foreign objects are blocked outside the grille 1 and cannot enter the grille 1. When the outdoor unit is running, one second connecting rib 221 overlaps with one first connecting rib 212, and the second connecting ribs 221 are staggered with the ventilation holes 211. Since the second connecting ribs 221 no longer cover the ventilation holes 211, the ventilation holes 211 are connected to the air outlet, and the air blown out of the air outlet can be smoothly blown out of the ventilation holes 211. The first cover 21 and the second cover 22 of this invention both adopt the structure of connecting ribs. This structure can not only cover the ventilation holes 211, but also ensure that the air outlet can blow out normally after overlapping, and fits the structure of the grille 1 more closely.

[0041] In one specific implementation, the first cover 21 further includes a first sleeve 214 and a first connecting ring 215. The first connecting ring 215 is disposed on the outside of the first sleeve 214. One end of a plurality of first connecting ribs 212 is connected to the first sleeve 214, and the other end is connected to the first connecting ring 215. The second cover 22 further includes a second sleeve 222 and a second connecting ring 223. The second connecting ring 223 is disposed on the outside of the second sleeve 222. One end of a plurality of second connecting ribs 221 is connected to the second sleeve 222, and the other end is connected to the second connecting ring 223. The first connecting ribs 212 and the second connecting ribs 221 both extend towards the first connecting ring 215 at a certain angle, making the first cover 21 and the second cover 22 conical. Compared with a flat surface, the inclined surface formed by this structure will automatically slide under the influence of gravity when snow and foreign objects fall on the inclined surface, avoiding the accumulation of a large amount of snow and foreign objects on the first cover 21 and the second cover 22.

[0042] Specifically, the first sleeve 214 extends into the second sleeve 222 and connects to the grille 1, and the first sleeve 214 is fitted with a bearing 216 for the second sleeve 222 to rotate relative to the first sleeve 214. The bearing 216 between the first sleeve 214 and the second sleeve 222 allows the second cover 22 to rotate relative to the first cover 21 while the first cover 21 remains stationary, resulting in a more stable connection structure.

[0043] See also Figure 7 As shown, a drive assembly 3 is provided on the grille 1. The drive assembly 3 is used to drive the second cover 22 to rotate relative to the first cover 21 and the grille 1. The rotation of the second cover 22 can be done manually or by a drive. The drive method is more flexible and saves manpower.

[0044] The drive assembly 3 includes a motor 301, a turntable 302, and a connecting rod 303 mounted on the turntable 302. The motor 301 is mounted on the grille 1, and the output shaft of the motor 301 is connected to the turntable 302. The two ends of the connecting rod 303 are connected to the second cover 22.

[0045] In this embodiment, when the motor 301 is working, it drives the turntable 302 to rotate, and the connecting rod 303 swings back and forth within a certain angle, so that the second connecting rib 221 coincides with the first connecting rib 212 or the ventilation hole 211, thereby optimizing the rotation mode of the second cover 22.

[0046] In one specific implementation, the second cover 22 is disposed between the first cover 21 and the grille 1. The grille 1 also includes a third sleeve 102, which protrudes from the outer surface of the grille 1. A limiting ring is provided inside the third sleeve 102, and the motor 301 is embedded in the limiting ring. The first sleeve 214 extends sequentially into the second sleeve 222 and the third sleeve 102, and the first sleeve 214 is axially movable along the third sleeve 102. The turntable 302 is located inside the first sleeve 214, and both ends of the connecting rod 303 extend into and connect to the first sleeve 214. The motor 301 and the turntable 302 are both located in the first sleeve 214. This relatively sealed structure can prevent snow and foreign objects from entering the motor 301 and prevent the turntable 302 from failing to rotate normally.

[0047] In one specific implementation, the connecting rod 303 has first mounting holes at both ends, and the second sleeve 222 has a first mounting post 224 at its bottom. The first mounting post 224 is installed in the first mounting hole, so that the connecting rod 303 drives the second cover 22 to rotate during its swing. The connecting rod 303 has a second mounting hole in its middle, and the turntable 302 has a second mounting post 225 installed in the second mounting hole, so that the turntable 302 can drive the connecting rod 303 to swing during its rotation.

[0048] The first enclosure 21 is provided with at least two clearance holes 213. The two ends of the connecting rod 303 extend out of the clearance holes 213 and connect to the second enclosure 22. The two ends of the connecting rod 303 can swing within the two clearance holes 213. The width of the clearance hole 213 is A, and the swing angle of the connecting rod 303 is B, where 0° < B < 15°. The value of the width A determines the size of the swing angle B, which can be selected according to the size of the air outlet of the grille 1. It should not be too large to prevent the second connecting rib 221 from blocking too much wind and affecting the performance of the outdoor unit.

[0049] A micro switch is provided on the grille 1, and the protective cover 2 can be moved away from the micro switch or pressed. A heater is provided on the protective cover 2, and the micro switch is used to turn the heater on or off.

[0050] In this embodiment, when excessive snow falls on the protective cover 2, the total weight of the protective cover 2 increases. The first cover 21 moves axially towards the grille 1 and presses the micro switch, activating the heater to melt the snow on the protective cover 2, achieving the effect of snow removal and de-icing. As the snow gradually melts, the first cover 21 moves in the opposite direction, away from the micro switch, and the heater stops working. This invention uses a heater to remove snow. Combined with the structure of the first cover 21 and the second cover 22, the amount of snow can be determined by the change in the total weight of the protective cover 2, automatically performing snow removal to ensure that there is no snow or only a small amount of snow on the protective cover 2. This prevents snow from entering the grille 1 after the ventilation hole 211 connects with the air outlet, thus affecting the airflow.

[0051] As a specific implementation method, heaters are provided on both the first cover 21 and the second cover 22 to accelerate the melting speed of the snow and increase the heating area, ensuring that the snow on both the first cover 21 and the second cover 22 can be cleared.

[0052] An elastic element 42 is provided on the grille 1. One side of the elastic element 42 is connected to the grille 1, and the other side is connected to the protective cover 2. The elastic element 42 is a spring. When there is too much snow accumulation on the first cover 21 and the second cover 22, the first cover 21 moves axially, and the elastic element 42 is compressed. As the snow gradually melts, the total weight of the protective cover 2 decreases, and the elastic element 42 gradually stretches. The present invention provides an elastic element 42 that allows the first cover 21 to automatically return to its original position according to the degree of snow melting.

[0053] In one specific implementation, the elastic element 42 is disposed within the third sleeve 102, and the micro switch is also disposed within the third sleeve 102. The bottom of the first sleeve 214 is connected to the elastic element 42. During the axial movement of the first sleeve 214, when the elastic element 42 is compressed to a certain extent, the micro switch can be pressed. This invention addresses the issue of snow accumulation affecting the overall weight of the protective cover 2. By cooperating with the elastic element 42, the micro switch, and the heater, automatic snow removal can be achieved. This allows for flexible snow removal based on the degree of snow accumulation, resulting in more precise control over the snow removal process.

[0054] It also includes a controller, which is electrically connected to the heater and a microswitch. The controller is used to start or stop the heater based on the trigger state of the microswitch. Specifically, the controller is also electrically connected to the motor 301. After receiving a signal from the microswitch, the controller starts the heater, but the motor 301 will not start until the microswitch is turned off. Then, the controller turns off the heater, and the motor 301 starts again. This invention enables the controller to automatically determine if snow has not been cleared, and the second cover 22 will not rotate to prevent snow from falling into the grille 1.

[0055] An outdoor unit includes a top cover assembly, which is the top cover assembly described above, and also includes an exhaust motor 301 and a fan blade 5 sleeved on the output shaft of the exhaust motor.

[0056] A method for controlling an outdoor unit, the method comprising:

[0057] The protective cover 2 includes a first state and a second state depending on the operating status of the outdoor unit;

[0058] When the outdoor unit is in standby mode, the protective cover 2 is in the first state, the motor 301 is not started, the protective cover 2 is in a closed state, and the second cover 22 covers the air outlet.

[0059] The outdoor unit is ready to start, the protective cover 2 is in the second state, and the ventilation hole 211 is connected to the air outlet.

[0060] In this embodiment, the first state, i.e., the second cover 22, does not rotate, and the second state, i.e., the second cover 22 rotates. It is worth noting that the initial state of the protective cover 2 is that the second cover 22 covers the air outlet. When the protective cover 2 is in the first state, it always maintains this initial state, and even when the protective cover 2 is in the second state, it initially maintains the initial state as well. If the protective cover 2 does not maintain its initial state, the motor 301 starts, driving the second cover 22 to perform a reset action.

[0061] The second state also includes:

[0062] S21: When the total weight G of the protective cover 2 is less than the elastic force F of the elastic element 42, the second cover 22 rotates, and the ventilation hole 211 connects with the air outlet.

[0063] Specifically, when the total weight G of the protective cover 2 is less than the elastic force F of the elastic element 42, it means that there is no snow or only a small amount of snow on the protective cover 2, but it will not affect the normal opening of the air outlet. At this time, the micro switch is not triggered, the motor 301 works, the rotation direction of the motor 301 is opposite to the direction of the reset action, the second cover 22 also rotates in the opposite direction, the second connecting rib 221 coincides with the first connecting rib 212, and the ventilation hole 211 is connected to the air outlet.

[0064] S22: When the total weight G of the protective cover 2 is greater than or equal to the elastic force F of the elastic element 42, the heater first performs snow removal and ice melting. When the total weight G of the protective cover 2 is less than the elastic force F of the elastic element 42, the heater stops working, the second cover 22 rotates, and the ventilation hole 211 connects with the air outlet.

[0065] Specifically, when the total weight G of the protective cover 2 is greater than or equal to the elastic force F of the elastic element 42, it indicates that there is a large amount of snow on the protective cover 2. If the motor 301 drives the second cover 22 to rotate, the snow will enter the grid 1. Therefore, the snow needs to be removed first. At this time, the micro switch is triggered, and the heater works first until the total weight G of the protective cover 2 is less than the elastic force F of the elastic element 42, that is, the snow on the protective cover 2 is cleared or there is a small amount of snow. At this time, the heater stops working, and the motor 301 works again.

[0066] This control method, combined with the structure of the top cover assembly, allows for flexible snow removal based on the degree of snow accumulation, and avoids starting the motor 301 even when there is a large amount of snow, thus ensuring the normal operation of the outdoor unit.

[0067] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0068] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A top cover assembly, characterized in that, include: Grille (1) and protective cover (2); The grille (1) is provided with a plurality of air guide strips (101) spaced apart, and an air outlet is formed between adjacent air guide strips (101); The protective cover (2) includes a first cover (21) and a second cover (22). The first cover (21) is provided with a plurality of ventilation holes (211) spaced apart in the circumferential direction. The first cover (21) can be slidably arranged along the axial direction of the grille (1). The second cover (22) is arranged between the first cover (21) and the grille (1). The second cover (22) is rotatably arranged relative to the first cover (21). The second cover (22) is used to connect the ventilation holes (211) with the air outlet or cover the air outlet. A micro switch is provided on the grille (1), the protective cover (2) can be moved away from the micro switch or pressed, and a heater is provided on the protective cover (2), the micro switch is used to turn the heater on or off; an elastic element (42) is provided on the grille (1), one side of the elastic element (42) is connected to the grille (1), and the first sleeve (214) of the first cover (21) is connected to the other side of the elastic element (42).

2. The top cover assembly according to claim 1, characterized in that, The first cover (21) is provided with a plurality of first connecting ribs (212) spaced apart, and the ventilation holes (211) are formed between adjacent first connecting ribs (212). The second cover (22) is provided with a plurality of second connecting ribs (221) spaced apart, and the second connecting ribs (221) may overlap with the first connecting ribs (212) or overlap with the ventilation holes (211).

3. The top cover assembly according to claim 1, characterized in that, A drive assembly (3) is provided on the grille (1), and the drive assembly (3) is used to drive the second cover (22) to rotate relative to the first cover (21) and the grille (1).

4. The top cover assembly according to claim 3, characterized in that, The drive assembly (3) includes a motor (301), a turntable (302), and a connecting rod (303) disposed on the turntable (302). The motor (301) is disposed on the grille (1), the output shaft of the motor (301) is connected to the turntable (302), and the two ends of the connecting rod (303) are connected to the second cover (22).

5. The top cover assembly according to claim 4, characterized in that, The first cover (21) is provided with at least two clearance holes (213), and the two ends of the connecting rod (303) extend out of the clearance holes (213) and connect to the second cover (22), and the two ends of the connecting rod (303) can swing in the two clearance holes (213).

6. The top cover assembly according to claim 5, characterized in that, It also includes a controller, which is electrically connected to the heater and the micro switch, and is used to start or stop the heater according to the trigger state of the micro switch.

7. An outdoor unit, characterized in that, Includes a top cover assembly, wherein the top cover assembly is the top cover assembly according to any one of claims 1 to 6.

8. A control method for an outdoor unit, characterized in that, The control method for controlling the outdoor unit according to claim 7 includes: The protective cover (2) includes a first state and a second state depending on the operating status of the outdoor unit; When the outdoor unit is in standby mode, the protective cover (2) is in the first state, and the second cover (22) covers the air outlet. The outdoor unit is ready to start, the protective cover (2) is in the second state, and the ventilation hole (211) is connected to the air outlet.

9. The outdoor unit control method according to claim 8, characterized in that, When the grille (1) is provided with an elastic element (42) and the protective cover (2) is provided with a heater, the second state further includes: When the total weight of the protective cover (2) is less than the elastic force of the elastic element (42), the second cover (22) rotates, and the ventilation hole (211) connects with the air outlet; When the total weight of the protective cover (2) is greater than or equal to the elastic force of the elastic element (42), the heater first performs snow removal and de-icing. When the total weight of the protective cover (2) is less than the elastic force of the elastic element (42), the heater stops working, the second cover (22) rotates, and the ventilation hole (211) connects with the air outlet.

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