Electric heater

Abstract

The invention relates to an electric heater which comprises a shell provided with an air inlet and a mist outlet, a heating body corresponding to the air inlet and arranged in the shell, and a heating element arranged in the shell, the humidifying mechanism is arranged in the shell corresponding to the mist outlet and comprises a humidifying assembly and a fan, the humidifying assembly is used for atomizing liquid to form mist, and the fan is arranged on the side, facing the heating body, of the humidifying assembly; the fan is used for driving external airflow to flow through the heating body from the air inlet to form hot air, and the fan is further used for driving the hot air to flow through the interior of the humidifying assembly and carry mist to flow out from the mist outlet. When the fan works, external airflow can be driven to flow to the heating body from the air inlet to form hot air, then the hot air is driven to flow to the interior of the humidifying mechanism, the hot air makes contact with mist formed in the humidifying assembly, the mist temperature is increased, and then the atomization effect is improved. Moreover, after the hot air enters the humidifying assembly, liquid in the humidifying assembly is also heated, the atomization efficiency and the atomization amount can be further improved, and therefore the atomization effect is improved.

Description

Technical Field

[0001] The present application relates to the technical field of household appliances, and in particular to electric heaters. Background Art

[0002] The skirting electric heater is a heating device that uses thermal superconductor materials as the basic heating unit and has a skirting appearance. This device organically combines the skirting and the electric heater, which not only does not take up space but also achieves the purpose of heating, overcomes the problem of high power consumption of electric heating, and creates a precedent for electric heating technology. Among them, the skirting electric heater uses the principle of heat circulation, heats and dissipates heat along the four sides of the room, has a uniform temperature, has a small temperature difference at each point in the room, and circulates hot air from bottom to top. It heats up immediately after turning on, has a low usage fee, is extremely simple to install, is basically maintenance-free, and can be easily disassembled and carried.

[0003] In the related art, in order to prevent the air from being too dry when the electric heater is working, the electric heater can generally be set to have a humidification function, but the humidification efficiency of traditional electric heaters is low and the humidification amount is insufficient. Summary of the invention

[0004] Based on this, it is necessary to provide an electric heater to address the problem of insufficient humidification of traditional electric heaters.

[0005] An electric heater, comprising:

[0006] The housing is provided with an air inlet and a mist outlet:

[0007] A heating element is disposed in the housing corresponding to the air inlet;

[0008] A humidifying mechanism is provided in the housing corresponding to the mist outlet and comprises a humidifying component and a fan, wherein the humidifying component is used to atomize liquid to form mist, and the fan is provided on a side of the humidifying component facing the heating element;

[0009] The fan is used to drive the external air flow from the air inlet to flow through the heating element to form hot air. The fan is also used to drive the hot air to flow through the inside of the humidification component and carry the mist to flow out from the mist outlet.

[0010] In the above electric heater, the fan is arranged on the side of the humidification component facing the heating element, so that the fan is close to the heating element. When the fan is working, it can drive the external airflow from the air inlet to the heating element to form hot air, and then drive the hot air to flow into the humidification mechanism. The hot air contacts the mist formed inside the humidification component, increasing the temperature of the mist and thus improving the atomization effect. Moreover, after the hot air enters the humidification component, the liquid inside the humidification component is also heated, which can further improve the atomization efficiency and atomization amount, thereby improving the atomization effect.

[0011] In some embodiments, the humidifying component and the heating element are arranged along a first direction, and in the first direction, the fan is located between the humidifying component and the heating element, and the air inlet side of the fan faces the heating element.

[0012] In some embodiments, the humidification component includes a shell, a water tank and an atomizer. The water tank is disposed in the shell, and a water tank is defined between the water tank and the shell. The atomizer is disposed on the shell and at least partially extends into the water tank. The fan is disposed on a side of the shell facing away from the water tank, and the air outlet side of the fan is connected to the water tank.

[0013] In some of the embodiments, an air duct adjacent to the water tank is formed on the shell, one end of the air duct is connected to the water tank, and the fan is installed at the other end of the air duct.

[0014] In some embodiments, the shell is sleeved in the outer shell, an air inlet gap is defined between the shell and the outer shell, and the air inlet gap is fluidically connected between the heating element and the fan.

[0015] In some embodiments, the shell has a first bottom wall opposite to the mist outlet, and a first water retaining rib is provided on the first bottom wall. The first water retaining rib is provided between the fan and the heating element, and the first water retaining rib is spaced apart from the air inlet side of the fan to form the air inlet gap.

[0016] In some embodiments, the shell includes a second bottom wall facing the first bottom wall, the second bottom wall is spaced apart from the first bottom wall, and the second bottom wall is provided with a second water retaining rib located between the first water retaining rib and the fan; the second water retaining rib blocks an end of the air inlet side of the fan close to the second bottom wall, and is spaced apart from the first water retaining rib.

[0017] In some embodiments, the first water retaining rib extends toward the second bottom wall and is spaced apart from the second bottom wall, and the second water retaining rib extends toward the first bottom wall and is spaced apart from the first bottom wall; along the first direction, the orthographic projection of the first water retaining rib toward the second water retaining rib covers at least a portion of the second water retaining rib.

[0018] In some embodiments, in a second direction from the first bottom wall to the second bottom wall and intersecting the first direction, a height of the first water retaining rib is greater than a height of the second water retaining rib.

[0019] In some embodiments, a drainage port is provided on the first bottom wall corresponding to the fan, and the drainage port is located on a side of the first water retaining rib facing away from the heating element.

[0020] In some embodiments, a third water retaining rib is further provided on the first bottom wall, and a fourth water retaining rib is further provided on the second bottom wall. The third water retaining rib and the fourth water retaining rib both surround the outer periphery of the fan and are provided on a side of the fan away from the heating element, and the third water retaining rib is sleeved on the outer side of the fourth water retaining rib facing away from the fan.

[0021] In some embodiments, the first water retaining rib blocks the first side of the fan facing the heating element, the fourth water retaining rib is arranged in a semi-circular shape around the remaining circumference of the fan except the first side, and the third water retaining rib is arranged around at least part of the circumference of the fourth water retaining rib. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of an electric heater in some embodiments of the present application;

[0023] Figure 2 This is a schematic diagram of a partial structure of an electric heater in some embodiments of the present application;

[0024] Figure 3 This is an exploded schematic diagram of an electric heater in some embodiments of the present application;

[0025] Figure 4 This is a schematic diagram of the structure of the humidification mechanism in some embodiments of the present application;

[0026] Figure 5 It is a partial schematic diagram of the shell in some embodiments of the present application.

[0027] Explanation of the reference numerals in the accompanying drawings: 100, electric heater; 10, outer shell; 11, air inlet; 13, mist outlet; 15, first bottom wall; 151, first water retaining rib; 153, third water retaining rib; 155, drain outlet; 30, heating element; 50, humidifying mechanism; 60, humidifying assembly; 62, shell; 621, air duct; 623, transition channel; 63, second bottom wall; 631, second water retaining rib; 633, fourth water retaining rib; 64, water tank; 66, atomizer; 67, water tank; 70, air inlet gap; 80, fan. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0029] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0034] See also Figure 1-Figure 3 According to some embodiments of the present application, the present application provides an electric heater, including a housing, a heating element and a humidifying mechanism 50. The housing 10 is provided with an air inlet 11 and a mist outlet 13. The heating element 30 is arranged in the housing 10 corresponding to the air inlet 11. The humidifying mechanism 50 is arranged in the housing 10 corresponding to the mist outlet 13. The humidifying mechanism 50 includes a humidifying component 60 and a fan 80. The humidifying component 60 is used to atomize liquid to form mist. The fan 80 is arranged on the side of the humidifying component 60 facing the heating element 30. The fan 80 is used to drive the external air flow from the air inlet 11 to flow through the heating element 30 to form hot air. The fan 80 is also used to drive the hot air to flow through the inside of the humidifying component 60 and carry the mist to flow out from the mist outlet 13.

[0035] That is to say, the fan 80 is arranged on the side of the humidifying component 60 facing the heating element 30, so that the fan 80 is close to the heating element 30. When the fan 80 is working, it can drive the external airflow from the air inlet 11 to the heating element 30 to form hot air, and then drive the hot air to flow into the humidifying mechanism 50. The hot air contacts the mist formed inside the humidifying component 60, increases the temperature of the mist, and then improves the atomization effect. In addition, after the hot air enters the humidifying component 60, the liquid inside the humidifying component 60 is also heated, which can further improve the atomization efficiency and atomization amount, thereby improving the atomization effect.

[0036] Furthermore, the humidifying component 60 and the heating element 30 are arranged along a first direction, and in the first direction, the fan 80 is located between the humidifying component 60 and the heating element 30, and the air inlet side of the fan 80 faces the heating element 30. In this way, when the fan 80 is working, it can drive the airflow from the air inlet 11 to flow through the heating element 30, and then flow to its own air inlet side to form hot air.

[0037] Optionally, the first direction is a direction in which the electric heater 100 extends longitudinally, and the humidifying mechanism 50 and the heating element 30 are arranged in the direction in which the electric heater 100 extends longitudinally.

[0038] According to some embodiments of the present application, the humidification assembly 60 includes a housing 62, a water tank 64, and an atomizer 66. The water tank 64 is sleeved in the housing 62, and a water tank 67 is defined between the water tank 64 and the housing 62. The atomizer 66 is disposed on the housing 62 and at least partially extends into the water tank 67. In this way, the water in the water tank 64 can flow to the water tank 67, and the atomizer 66 can atomize the water in the water tank 67 into mist.

[0039] Furthermore, the fan 80 is disposed on the side of the housing 62 facing away from the water tank 67, and the air outlet side of the fan 80 is connected to the water tank 67. When the fan 80 is working, it drives the airflow to flow through the heating element 30 to form hot air, and then drives the hot air to flow to the water tank 67. On the one hand, the hot air can carry the mist formed above the water tank 67 out, heat the mist temperature, and improve the atomization efficiency. On the other hand, the hot air can heat the temperature of the water in the water tank 67, which can further improve the atomization efficiency and the atomization amount, so that the electric heater 100 has a better humidification performance.

[0040] Furthermore, an air duct 621 adjacent to the water trough 67 is formed on the shell 62, one end of the air duct 621 is connected to the water trough 67, and the other end of the air duct 621 is installed with a fan 80, so that the fan 80 and the water trough 67 are connected through the air duct 621, and the hot air generated when the fan 80 is working flows to the water trough 67 through the air duct 621.

[0041] Optionally, a transition channel 623 adjacent to the air duct 621 is also formed on the shell 62, and the end of the air duct 621 away from the fan 80 is connected to the transition channel 623, and the end of the water tank 67 away from the fan 80 is also connected to the transition channel 623, so that the water tank 67 and the air duct 621 have an opening on the same side that is connected to the transition channel 623, so that the water tank 67 and the air duct 621 are connected through the transition channel 623.

[0042] Specifically in some embodiments, the air duct 621 and the transition channel 623 are both extended along a second direction intersecting with the first direction, for example, extended along the up-down direction of the electric heater 100 .

[0043] See also Figure 2-Figure 5 According to some embodiments of the present application, the housing 62 is sleeved in the housing 10, and an air inlet gap 70 is defined between the housing 62 and the housing 10, and the air inlet gap 70 is fluidically connected between the heating element 30 and the fan 80. In this way, after the fan 80 is installed on the outside of the housing 62 and the humidifying mechanism 50 is sleeved in the housing 10, the air inlet gap 70 is reserved between the housing 62 and the housing 10, and when the fan 80 is working, the hot air passing through the heating element 30 can flow to the air inlet side of the fan 80, ensuring the connectivity of the air flow channel.

[0044] According to some embodiments of the present application, the housing 10 has a first bottom wall 15 opposite to the mist outlet 13, and a first water retaining rib 151 is provided on the first bottom wall 15. The first water retaining rib 151 is provided between the fan 80 and the heating element 30, and the first water retaining rib 151 is spaced apart from the air inlet side of the fan 80 to form an air inlet gap 70. In this way, the first water retaining rib 151 is provided on the first bottom wall 15 of the housing 10, and the first water retaining rib 151 is located between the fan 80 and the heating element 30. When the water in the water tank 67 of the electric heater 100 is tilted to flow toward the fan 80 along the air duct 621, the first water retaining rib 151 can block the water flow, prevent the water flow from flowing toward the heating element 30, and prevent the heating element 30 from malfunctioning after water enters the heating element 30, thereby improving the safety performance of the user.

[0045] At the same time, an air inlet gap 70 is formed between the first water retaining rib 151 and the fan 80. The hot air passing through the heating element 30 can flow to the fan 80 from the air inlet gap 70 on one side of the first water retaining rib 151. The first water retaining rib 151 will not block the air inlet side of the fan 80, thereby ensuring smooth airflow.

[0046] Furthermore, the housing 62 includes a second bottom wall 63 facing the first bottom wall 15, the second bottom wall 63 is spaced apart from the first bottom wall 15, and a second water retaining rib 631 is disposed on the second bottom wall 63 and is located between the first water retaining rib 151 and the fan 80; the second water retaining rib 631 shields the end of the fan 80 near the second bottom wall 63 on the air inlet side, and is spaced apart from the first water retaining rib 151. In this way, the second water retaining rib 631 is disposed at the end of the fan 80 near the second bottom wall 63, so that the end of the fan 80 near the second bottom wall 63 is shielded by the second water retaining rib 631, so as to prevent the liquid in the air duct 621 from flowing out from the side of the fan 80 near the second bottom wall 63, further prevent the liquid from flowing to the heating element 30, and further improve the safety performance of the user.

[0047] At the same time, the first water retaining rib 151 and the second water retaining rib 631 are spaced apart from each other, allowing airflow to flow to the gap between the first water retaining rib 151 and the second water retaining rib 631 and then to the air inlet side of the fan 80 .

[0048] Specifically in some embodiments, the first water retaining rib 151 extends toward the second bottom wall 63 and is spaced from the second bottom wall 63, and the second water retaining rib 631 extends toward the first bottom wall 15 and is spaced from the first bottom wall 15. In this way, when the fan 80 is working, the hot air formed by the heating element 30 first flows through the gap between the first water retaining rib 151 and the second bottom wall 63 to the air inlet gap 70, and then flows through the gap between the second water retaining rib 631 and the first bottom wall 15 to the fan 80, thereby achieving fluid communication between the air inlet gap 70 and the heating element 30 and the fan 80.

[0049] Moreover, along the first direction, the orthographic projection of the first water retaining rib 151 toward the second water retaining rib 631 covers at least a portion of the second water retaining rib 631, that is, the free end of the first water retaining rib 151 is sleeved outside the free end of the second water retaining rib 631 at intervals, and the free end of the first water retaining rib 151 and the free end of the second water retaining rib 631 cooperate with each other to block, and effectively block in the entire height direction from the first bottom wall 15 to the second bottom wall 63.

[0050] Furthermore, in the second direction from the first bottom wall 15 to the second bottom wall 63 and intersecting with the first direction, the height of the first water retaining rib 151 is greater than the height of the second water retaining rib 631, that is, the first water retaining rib 151 is higher. In this way, when the electric heater 100 is tilted, the water in the water tank 67 flows from the air duct 621 to the fan 80 and the first bottom wall 15, and can be blocked by the higher first water retaining rib 151 to prevent the first water retaining rib from being too low and weakening the water retaining capacity. In this way, the higher first water retaining rib 151 can effectively block the water at the first bottom wall 15 from flowing toward the heating element 30.

[0051] According to some embodiments of the present application, a drain outlet 155 is provided on the first bottom wall 15 corresponding to the fan 80, and the drain outlet 155 is located on the side of the first water retaining rib 151 facing away from the heating element 30. In this way, the water flow blocked by the first water retaining rib 151 above the first bottom wall 15 can be discharged from the outer shell 10 through the drain outlet 155, thereby preventing the water flow from accumulating in the outer shell 10 and then entering the electrical components, thereby further improving the safety performance of the electric heater 100.

[0052] According to some embodiments of the present application, a third water retaining rib 153 is further provided on the first bottom wall 15, and a fourth water retaining rib 633 is further provided on the second bottom wall 63. The third water retaining rib 153 and the fourth water retaining rib 633 are both arranged around the periphery of the extension unit and arranged on the side of the fan 80 away from the heating element 30, and the third water retaining rib 153 is sleeved on the outer side of the fourth water retaining rib 633 facing away from the fan 80. In this way, the third water retaining rib 153 and the fourth water retaining rib 633 are arranged on the side of the fan 80 away from the heating element 30, and the peripheral side of the fan 80 facing away from the heating element 30 is also protected from water, so as to prevent water flowing out of the air duct 621 from flowing into other parts and components on the periphery of the fan 80, and further improve the safety performance of each electrical component in the electric heater 100.

[0053] Furthermore, the first water retaining rib 151 blocks the first side of the fan 80 facing the heating element 30, the fourth water retaining rib 633 is arranged in a semi-circular shape around the remaining periphery of the fan 80 except the first side, and the third water retaining rib 153 is arranged around at least part of the periphery of the fourth water retaining rib 633. In this way, by surrounding the fourth water retaining rib 633 at other peripheries outside the first side of the fan 80, the fourth water retaining rib 633 and the first water retaining rib 151 can block the entire periphery of the fan 80, preventing the water flow entering the air duct 621 from flowing toward the fan 80 and then flowing around the fan 80, so that the water flow enters the electrical components around the fan 80, further improving the waterproof performance of the electrical components.

[0054] At the same time, the third water retaining rib 153 is arranged around the fourth water retaining rib 633. On the one hand, the third water retaining rib 153 and the fourth water retaining rib 633 cooperate to guide the installation of the limiting shell 62 and the outer shell 10. On the other hand, through the cooperation of the third water retaining rib 153 and the fourth water retaining rib 633, the third water retaining rib 153 blocks the gap between the fourth water retaining rib 633 and the first bottom wall 15, thereby preventing the water flow inside the fourth water retaining rib 633 from flowing out of the gap between the fourth water retaining rib 633 and the first bottom wall 15, thereby further enhancing the water retaining performance.

[0055] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An electric heater, characterized in that: include: The housing is provided with an air inlet and a mist outlet: A heating element is disposed in the housing corresponding to the air inlet; A humidifying mechanism is provided in the housing corresponding to the mist outlet and comprises a humidifying component and a fan, wherein the humidifying component is used to atomize liquid to form mist, and the fan is provided on a side of the humidifying component facing the heating element; The fan is used to drive the external air flow from the air inlet to flow through the heating element to form hot air. The fan is also used to drive the hot air to flow through the inside of the humidification component and carry the mist to flow out from the mist outlet.

2. The electric heater according to claim 1, characterized in that: The humidifying component and the heating element are arranged along a first direction. In the first direction, the fan is located between the humidifying component and the heating element, and the air inlet side of the fan faces the heating element.

3. The electric heater according to claim 2, characterized in that: The humidifying component includes a shell, a water tank and an atomizer. The water tank is arranged in the shell, and a water tank is defined between the water tank and the shell. The atomizer is arranged on the shell and at least partially extends into the water tank. The fan is arranged on a side of the shell facing away from the water tank, and the air outlet side of the fan is connected to the water tank.

4. The electric heater according to claim 3, characterized in that: An air duct adjacent to the water tank is formed on the shell, one end of the air duct is communicated with the water tank, and the fan is installed at the other end of the air duct.

5. The electric heater according to claim 4, characterized in that: The shell is sleeved in the outer shell, and an air inlet gap is defined between the shell and the outer shell. The air inlet gap is fluidically connected between the heating element and the fan.

6. The electric heater according to claim 5, characterized in that: The housing has a first bottom wall opposite to the mist outlet, the first bottom wall is provided with a first water retaining rib, the first water retaining rib is arranged between the fan and the heating element, and the first water retaining rib is spaced apart from the air inlet side of the fan to form the air inlet gap.

7. The electric heater according to claim 6, characterized in that: The shell includes a second bottom wall facing the first bottom wall, the second bottom wall is spaced apart from the first bottom wall, and the second bottom wall is provided with a second water retaining rib located between the first water retaining rib and the fan; the second water retaining rib blocks an end of the wind inlet side of the fan close to the second bottom wall, and is spaced apart from the first water retaining rib.

8. The electric heater according to claim 7, characterized in that: The first water retaining rib extends toward the second bottom wall and is spaced apart from the second bottom wall, and the second water retaining rib extends toward the first bottom wall and is spaced apart from the first bottom wall; Along the first direction, the orthographic projection of the first water retaining rib toward the second water retaining rib covers at least a portion of the second water retaining rib.

9. The electric heater according to claim 8, characterized in that: In a second direction from the first bottom wall to the second bottom wall and intersecting the first direction, a height of the first water retaining rib is greater than a height of the second water retaining rib.

10. The electric heater according to any one of claims 6 to 9, characterized in that: A drainage port is provided on the first bottom wall corresponding to the fan, and the drainage port is located on a side of the first water retaining rib facing away from the heating element.

11. The electric heater according to any one of claims 6 to 9, characterized in that: A third water retaining rib is also provided on the first bottom wall, and a fourth water retaining rib is also provided on the second bottom wall. The third water retaining rib and the fourth water retaining rib both surround the outer periphery of the fan and are provided on a side of the fan away from the heating element, and the third water retaining rib is sleeved on the outer side of the fourth water retaining rib facing away from the fan.

12. The electric heater according to claim 11, characterized in that: The first water retaining rib blocks the first side of the fan facing the heating element, the fourth water retaining rib is arranged in a semi-circular shape around the remaining periphery of the fan except the first side, and the third water retaining rib is arranged around at least part of the periphery of the fourth water retaining rib.

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