Drying fan

Abstract

The utility model discloses a drying fan. The drying fan comprises a fan body, a control box and a positioning sealing piece. The control box comprises a box body, a control panel and a signal wire, a wire passing hole is formed in the box body, the control panel is arranged in the box body, one end of the signal wire is electrically connected with the control panel, and the other end of the signal wire penetrates out of the box body from the wire passing hole; and the positioning sealing element is arranged at the wire passing hole so as to seal and fix the signal wire. The problems that due to the fact that an existing drying fan is lack of a positioning sealing piece, signal lines are disordered and are prone to being cut, and impurities are prone to entering a control box are at least solved.

Description

Technical Field

[0001] The utility model relates to the technical field of fans, and in particular to a drying fan. Background Art

[0002] The drying principle of the drying fan is mainly that the drying heating tube generates heat by heating. The drying fan blows the heat generated by the drying heating tube into the inner drum through the drying air duct. The heat evaporates the water inside the clothes, medicinal materials, food materials, etc. and turns them into steam, thereby drying the items. The wiring harness of the drying fan in the drying air duct needs to be routed, sealed and fixed. In the prior art, only a single wiring harness is sealed, and the wiring harness is exposed. No protective measures are taken for the wiring harness, and the wiring harness is prone to aging.

[0003] The existing drying fan lacks a harness sealing and positioning structure, so the control harness will get tangled inside the control box when it is led out, and the harness is easily cut. Due to the lack of a positioning structure, the wiring inside the control box is messy, and the position of the harness tie is not properly positioned and controlled, making the harness easy to bend and fold. As the installation process continues, the harness needs to be combed multiple times, which greatly reduces production efficiency. Utility Model Content

[0004] The main purpose of the utility model is to provide a drying fan, which at least solves the problem that the signal lines of the existing drying fans are messy and easy to be cut due to the lack of positioning seals, and impurities are easy to enter the control box.

[0005] According to one aspect of the utility model, a drying fan is provided, comprising:

[0006] Fan body;

[0007] A control box, the control box comprising a box body, a control board and a signal line, the box body is provided with a wire-through hole, the control board is arranged in the box body, one end of the signal line is electrically connected to the control board, and the other end passes through the box body from the wire-through hole;

[0008] A positioning seal is arranged at the wire hole to seal and fix the signal wire.

[0009] Furthermore, the positioning seal includes a sealing portion and a supporting portion, the sealing portion is embedded in the wire hole and sleeved on the outer circumference of the signal line, the supporting portion is connected to the sealing portion and extends toward the outside of the control box, and the signal line is at least partially placed on the supporting portion.

[0010] Furthermore, the sealing portion comprises an annular spring buckle, and a notch portion is formed on the annular spring buckle.

[0011] Furthermore, the support portion includes a support block, and a reinforcing rib is connected between the support block and the control box.

[0012] Furthermore, the support portion is provided with a through hole, and the signal line is fixedly connected to the support portion by a cable tie passing through the through hole.

[0013] Furthermore, the reinforcing ribs include at least two, and the at least two reinforcing ribs are respectively arranged on two opposite sides of the through hole, and an avoidance portion is arranged on at least the reinforcing rib located on one side of the through hole.

[0014] Furthermore, the positioning seal comprises an elastic member, and the elastic member is integrally or separately arranged with the box body.

[0015] Furthermore, the fan body includes a casing, an impeller and a drive motor, the casing is surrounded to form a cavity, the impeller is rotatably installed in the cavity, the drive motor is installed on the casing and is drivingly connected to the impeller, and the drive motor is electrically connected to the control board.

[0016] Furthermore, the housing includes a first shell and a second shell, and the first shell is fixedly connected to the second shell and surrounds the cavity and an air outlet communicating with the cavity.

[0017] Furthermore, the box body includes a bottom shell and a cover body, the bottom shell and the cover body are arranged to form a receiving cavity, the side wall of the receiving cavity is provided with the wire hole, the control board is arranged in the receiving cavity, and the cover body is covered on the bottom shell.

[0018] Compared with the prior art, the utility model has at least the following effects: the drying fan mainly includes a cover body, a bottom shell, a control panel, a shell, a driving motor and a positioning seal. The cover body and the bottom shell are arranged to form a box body, wherein the positioning seal is located at the wire hole on the side wall of the box body. The positioning seal includes an annular snap, a notch, a support block, a reinforcing rib, an avoidance portion and a through hole. After the signal line is combed and fixed inside the box body, it passes through the positioning seal located at the wire hole to the external space of the box body, and the signal line is tied and fixed on the positioning seal with a cable tie, so that the signal line can be better fixed at the wire hole. In addition, the positioning seal can also better seal the wire hole to prevent impurities and insects from entering the box body through the wire hole, thereby damaging the drying fan. Since the positioning seal is arranged on the drying fan, the signal line only needs to be combed and tied with a cable tie once to complete the installation, which reduces the number of times the signal line is arranged.

[0019] That is to say, compared with the drying fan in the prior art, the present application can fix the signal line and seal the box body by setting a positioning seal on the drying fan, and can also prevent the signal line from being damaged. Because the number of times the signal line is combed is reduced during the installation process, the production efficiency is greatly improved. In addition, the positioning seal can ensure that the signal line is uniformly fixed at the wire hole. At the same time, due to the compact structural design of the positioning seal, it occupies less space and is easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0021] Figure 1 This is a schematic diagram of the overall structure of the drying fan disclosed in the embodiment of the utility model;

[0022] Figure 2 A schematic diagram of a housing of a drying fan disclosed in an embodiment of the utility model;

[0023] Figure 3 This is an exploded view of the drying fan disclosed in the embodiment of the utility model;

[0024] Figure 4 for Figure 3 Magnified view of part A in FIG.

[0025] The above drawings include the following reference numerals:

[0026] 10. Fan body; 11. Casing; 111. First shell; 112. Second shell; 113. Cavity; 114. Air outlet; 12. Impeller; 13. Drive motor; 20. Control box; 21. Box body; 211. Bottom shell; 2111. Accommodating cavity; 2112. Wire hole; 212. Cover; 22. Control board; 23. Signal line; 30. Positioning seal; 31. Sealing part; 311. Annular snap buckle; 3111. Notch; 32. Support part; 321. Support block; 322. Reinforcement rib; 3221. Avoidance part; 323. Through hole; 33. Elastic part; 40. Sealing strip; 50. Sealing ring; 60. Fixing part. DETAILED DESCRIPTION

[0027] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0029] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0030] See also Figures 1 to 4 As shown, according to an embodiment of the utility model, a drying fan is provided. The drying fan comprises a fan body 10 , a control box 20 and a positioning seal 30 .

[0031] Among them, the control box 20 includes a box body 21, a control board 22 and a signal line 23. The box body 21 is provided with a wire hole 2112, the control board 22 is arranged in the box body 21, one end of the signal line 23 is electrically connected to the control board 22, and the other end passes through the box body 21 from the wire hole 2112; the positioning seal 30 is arranged at the wire hole 2112 to seal and fix the signal line 23.

[0032] In the utility model, a mounting position (not shown in the figure) is reserved on the fan body 10 for the control box 20 to be installed, and the drive motor 13 is connected to the control board 22 in the box body 21 of the control box 20. The control board 22 is electrically connected with a signal line 23, and the signal line 23 passes through the positioning seal 30 set at the wire hole 2112 and then extends out of the external space of the box body 21. The embarrassing situation that the signal line 23 is messy inside the box body and tangled and inconvenient to install is avoided, and the installation efficiency is improved. In addition, since the previous drying fan does not have a positioning seal 30 at the wire hole 2112, but directly passes the signal line 23 that has not been combed and fixed directly through the wire hole 2112 of the box body 21 and then extends to the outside of the box body 21, such a design will inevitably cause the signal line 23 to be cut by the sharp part of the wire hole 2112 (not shown in the figure), reducing the service life of the signal line 23 and even the service life of the entire drying fan, causing unnecessary economic losses.

[0033] That is to say, compared with the existing drying fan, the drying fan in this embodiment is provided with a positioning seal 30 to position and seal the signal line 23 at the wire hole 2112, which can effectively protect the signal line 23 from being cut, thereby preventing the conductive part of the signal line 23 (not shown in the figure) from being exposed to the air, thereby improving the service life of the signal line 23 and also improving the safety.

[0034] Further, see Figure 1 , Figure 3 as well as Figure 4 As shown, the positioning seal 30 includes a sealing portion 31 and a supporting portion 32. The sealing portion 31 is embedded in the wire hole 2112 and is sleeved on the outer periphery of the signal line 23. The supporting portion 32 is connected to the sealing portion 31 and extends toward the outside of the control box 20. The signal line 23 is at least partially placed on the supporting portion 32.

[0035] Specifically, the positioning seal 30 can be made of an elastic colloid material such as resin glue, rubber and silicone, and the sealing portion 31 and the supporting portion 32 can be an integrally formed design or a split-formed design and then bonded together. When the sealing portion 31 and the supporting portion 32 are integrally formed, they can be processed by injection molding, compression molding, and calendering molding. When the sealing portion 31 and the supporting portion 32 are split-formed, the sealing portion 31 and the supporting portion 32 can be respectively processed by injection molding, compression molding, and calendering molding, and then bonded together by glue. The sealing portion 31 is provided on the positioning seal 30 so that after the signal line 23 passes through the wire hole 2112, the signal line 23 can be wrapped by the sealing portion 31 to prevent the outer skin of the signal line 23 from being cut by the hole wall (not shown in the figure) of the wire hole 2112 and the sharp parts around the wire hole 2112. In addition, the sealing portion 31 can also effectively seal the wire hole 2112, preventing impurities such as dust and insects from entering the interior of the box body 21 through the wire hole 2112, thereby damaging the drying fan. The support portion 32 is provided on the positioning seal 30 to support the sealing portion 31 and the signal line 23 at the wire hole 2112, and because the positioning seal 30 is made of an elastic colloid material, it can effectively prevent the signal line 23 from being excessively bent at the wire hole 2112, thereby slowing down the breaking of the signal line 23. Compared with the prior art, the present application can effectively improve the service life of the drying fan.

[0036] Further, see Figure 1 , Figure 3 and Figure 4 As shown, the sealing part 31 includes an annular spring buckle 311, and a notch 3111 is provided on the annular spring buckle 311. The sealing part 31 wraps the signal line 23 at the wire hole 2112 through the annular spring buckle 311. Because the notch 3111 is provided on the annular spring buckle 311, and because the positioning seal 30 is made of an elastic colloid material, when the signal line 23 is led out from the wire hole 2112, the annular spring buckle 311 can be stretched from the notch along the tangent direction of the annular spring buckle 311 to both sides away from the notch 3111, and then the signal line 23 is inserted into the annular spring buckle 311 from the notch 3111, and then the annular spring buckle 311 is released, and the annular spring buckle 311 shrinks toward the notch 3111 under the action of elastic force until the signal line 23 is stuck.

[0037] Further, see Figure 1 , Figure 3 and Figure 4As shown, the support portion 32 includes a support block 321, and a reinforcing rib 322 is connected between the support block 321 and the control box 20. The function of the support block 321 is mainly to support and fix the signal line 23 after the signal line 23 passes through the annular spring buckle 311. The support block 321 can be a regular or irregular shape such as a cube, a rectangular parallelepiped, and a pancake. This embodiment shows the case when the support block 321 is a rectangular parallelepiped. For the remaining structures of the support block 321, as long as they are for supporting and fixing the signal line 23, they are all within the scope of protection claimed in this application. The reinforcing rib 322 is arranged between the support block 321 and the control box 20, and is located on the back side opposite to the annular spring buckle 311. The reinforcing rib 322 is arranged at the connection between the support block 321 and the control box 20. It has two main functions: one is to increase the connection reliability between the support block 321 and the control box 20, and the other is to strengthen the structural stability between the support block 321 and the control box 20, support the support block 321, the sealing part 31 and the signal line 23, thereby preventing the signal line 23 from bending arbitrarily and excessively at the wire hole 2112, and effectively protecting the signal line.

[0038] Further, see Figure 1 , Figure 3 and Figure 4 As shown, a through hole 323 is provided on the support portion 32 , and the signal line 23 is fixedly connected to the support portion 32 via a cable tie (not shown in the figure) passing through the through hole 323 .

[0039] Specifically, the through hole 323 is provided on the support block 321 of the support portion 32 and penetrates two surfaces respectively provided with the annular snap buckle 311 and the reinforcing rib 322. After the signal line 23 is laid on the support block 321, a cable tie is passed through the through hole 323 and the signal line 23 is tied and fixed on the support block 321. This is to prevent the signal line 23 from moving relative to the positioning seal 30, causing one end of the signal line 23 connected to the control board 22 to loosen or even fall off, thereby causing a safety hazard. The provision of the cable tie in this embodiment can effectively avoid the occurrence of such problems.

[0040] Further, see Figure 1 , Figure 3 and Figure 4 As shown, the reinforcing ribs 322 include at least two, and the at least two reinforcing ribs 322 are respectively arranged on two opposite sides of the through hole 323, and the avoiding portion 3221 is arranged on at least the reinforcing rib 322 located on one side of the through hole 323.

[0041] Specifically, the number of the reinforcing ribs 322 may be two, three, four or even more, and the reinforcing ribs may be regular or irregular shapes such as long strips, circles and sectors. The present application shows the case where two reinforcing ribs 322 are provided, and the other designs that change the number and shape of the reinforcing ribs 322 are all within the scope of the present application and are also within the scope of protection claimed in the present application. The reason why the reinforcing ribs 322 are provided on the opposite sides of the through hole 323 is mainly to make the gravity of the signal line 23, the sealing part 31 and the cable tie supported by the reinforcing ribs 322 act evenly on the box body 21 of the control box 20. The avoidance portion 3221 is mainly obtained by shortening the length of the reinforcing ribs 322, and the avoidance portion 3221 is obtained by at least shortening the length of one of the reinforcing ribs 322. The present application shows the case where the avoidance portion 3221 is formed by shortening one reinforcing rib 322. The avoidance portion 3221 is provided mainly to prevent at least a portion of the through hole from being blocked from the side by the reinforcing rib 322 , thereby providing a binding position for binding and fixing the signal line 23 to the support block 321 with a cable tie, and also facilitating the installer to bind and fix the signal line 23 with a cable tie.

[0042] Further, see Figure 1 , Figure 3 and Figure 4 As shown, the positioning seal 30 includes an elastic member 33, and the elastic member 33 is integrally arranged with the box body 21 or separately arranged. The elastic member 33 can be arranged on the bottom shell 211 of the box body 21, or on the cover body 212 of the box body 21. This embodiment shows the case where the elastic member 33 is arranged on the bottom shell 211 of the box body 21. When the elastic member 33 is integrally arranged with the bottom shell 211, the elastic member 33 and the bottom shell 211 can be processed by injection molding, compression molding, calendering molding, etc. When the elastic member 33 and the bottom shell 211 are separately arranged, the elastic member 33 and the bottom shell 211 can be processed by injection molding, compression molding, calendering molding, etc., respectively, and then the elastic member 33 is installed on the bottom shell 211 by bonding or clamping to install and fix the signal line 23 and seal the control box 20.

[0043] Further, see Figure 1 , Figure 2 as well as Figure 3 As shown, the fan body 10 includes a casing 11, an impeller 12 and a drive motor 13. The casing 11 is surrounded by a cavity 113, and the impeller 12 is rotatably installed in the cavity 113. The drive motor 13 is installed on the casing 11 and is drivingly connected to the impeller 12. The drive motor 13 is electrically connected to the control board 22.

[0044] Specifically, the impeller 12 is first mounted on the rotating shaft of the driving motor 13, and then the driving motor 13 is mounted on the housing 11 and placed in the cavity 113 formed by the housing 11. Finally, the driving motor 13 is electrically connected to the control board 22, and when the driving motor 13 is provided with electric energy, the driving motor 13 can rotate, thereby driving the impeller 12 to rotate.

[0045] Further, see Figure 1 , Figure 2 as well as Figure 3 As shown, the housing 11 includes a first shell 111 and a second shell 112, and the first shell 111 and the second shell 112 are fixedly connected and enclose a cavity 113 and an air outlet 114 connected to the cavity 113. The first shell 111 and the second shell 112 can be connected by screw connection, snap connection, welding and the like. This embodiment shows that the first shell 111 and the second shell 112 can be connected by a fixing member 60. A sealing strip 40 is also provided between the first shell 111 and the second shell 112 to increase the sealing of the connection between the first shell 111 and the second shell 112. When the driving motor 13 is driven to drive the impeller 12 to rotate, a continuous flow of wind energy can be generated from the air outlet 114 connected to the cavity 113 to the outside of the cavity 113 of the drying fan for use. Moreover, in order to further increase the sealing performance of the cavity formed by the connection of the first shell 111 and the second shell 112 and the reliability of the connection between the first shell 111 and the second shell 112 at the air outlet 114, a sealing ring 50 is provided around the air outlet 114 to surround the air outlet 114, thereby ensuring that wind energy will not be lost through other gaps.

[0046] Further, see Figure 1 and Figure 3 As shown, the box body 21 includes a bottom shell 211 and a cover body 212, the bottom shell 211 and the cover body 212 are arranged to form a receiving cavity 2111, a wire hole 2112 is arranged on the side wall of the receiving cavity 2111, the control board 22 is arranged in the receiving cavity 2111, and the cover body 212 is arranged on the bottom shell 211. The control board 22 can be arranged on the cover body 212 or on the bottom shell 211, and the control board 22 and the box body 21 can be connected by screw connection, snap connection, bonding, etc. This embodiment shows that the control board 22 is arranged on the bottom shell 211 and the control board 22 and the bottom shell 211 are connected by snap connection. The bottom shell 211 and the cover body 212 may also be connected by means of screw connection, snap connection, bonding, etc. This embodiment shows the situation where the bottom shell 211 and the cover body 212 are fixed together by snap connection and screw connection. The other connection methods between the bottom shell 211 and the cover body 212 are all within the scope of protection required by this application.

[0047] From the above statements, it can be known that the present application shows a drying fan, which mainly includes a cover body 212, a bottom shell 211, a control board 22, a shell 11, a drive motor 13 and a positioning seal 30. The cover body 212 and the bottom shell 211 are covered to form a box body 21, wherein the positioning seal 30 is located at the wire hole 2112 on the side wall of the box body 21. The positioning seal 30 includes an annular snap 311, a notch 3111, a support block 321, a reinforcing rib 322, an avoidance portion 3221 and a through hole 323. After the signal line 23 is combed and fixed inside the box body 21, it passes through the positioning seal 30 located at the wire hole 2112 to the external space of the box body 21, and the signal line is tied and fixed to the positioning seal 30 with a cable tie, so that the signal line 23 can be better fixed at the wire hole 2112. Furthermore, the positioning seal 30 can also better seal the wire hole 2112 to prevent impurities and insects from entering the box body 21 through the wire hole 2112, thereby damaging the drying fan. Since the positioning seal 30 is provided on the drying fan, the signal line 23 only needs to be combed and tied with a tie once to complete the installation, which reduces the number of times the signal line 23 needs to be combed.

[0048] It can be seen that the present application can fix the signal line 23 and seal the box body 21 by setting a positioning seal 30 on the drying fan, and can also prevent the signal line 23 from being damaged. Because the number of combing the signal line 23 is reduced during the installation process, the production efficiency is greatly improved. In addition, the positioning seal 30 can ensure that the signal line 23 is uniformly fixed at the wire hole 2112. At the same time, due to the compact structural design of the positioning seal 30, it occupies less space and is easy to install.

[0049] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0050] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only to facilitate the distinction between corresponding components. If not otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0051] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A drying fan, characterized in that: include: Fan body (10); A control box (20), the control box (20) comprising a box body (21), a control board (22) and a signal line (23), the box body (21) being provided with a line hole (2112), the control board (22) being arranged in the box body (21), one end of the signal line (23) being electrically connected to the control board (22), and the other end passing through the box body (21) from the line hole (2112); A positioning seal (30), wherein the positioning seal (30) is arranged at the wire hole (2112) to seal and fix the signal wire (23).

2. The drying fan according to claim 1, characterized in that: The positioning seal (30) comprises a sealing portion (31) and a supporting portion (32); the sealing portion (31) is embedded in the wire hole (2112) and sleeved on the outer circumference of the signal line (23); the supporting portion (32) is connected to the sealing portion (31) and extends toward the outside of the control box (20); and the signal line (23) is at least partially mounted on the supporting portion (32).

3. The drying fan according to claim 2, characterized in that: The sealing portion (31) comprises an annular spring buckle (311), and a notch portion (3111) is formed on the annular spring buckle (311).

4. The drying fan according to claim 2, characterized in that: The support portion (32) comprises a support block (321), and a reinforcing rib (322) is connected between the support block (321) and the control box (20).

5. The drying fan according to claim 4, characterized in that: The support portion (32) is provided with a through hole (323), and the signal line (23) is fixedly connected to the support portion (32) via a tie penetrating through the through hole (323).

6. The drying fan according to claim 5, characterized in that: The reinforcing ribs (322) include at least two, and the at least two reinforcing ribs (322) are respectively arranged on two opposite sides of the through hole (323), and an avoidance portion (3221) is arranged on at least one of the reinforcing ribs (322) located on one side of the through hole (323).

7. The drying fan according to any one of claims 1 to 6, characterized in that: The positioning seal (30) comprises an elastic member (33), and the elastic member (33) is integrally arranged with the box body (21) or separately arranged.

8. The drying fan according to any one of claims 1 to 6, characterized in that: The fan body (10) comprises a casing (11), an impeller (12) and a drive motor (13); the casing (11) is surrounded by a cavity (113); the impeller (12) is rotatably mounted in the cavity (113); the drive motor (13) is mounted on the casing (11) and is drive-connected to the impeller (12); and the drive motor (13) is electrically connected to the control panel (22).

9. The drying fan according to claim 8, characterized in that: The housing (11) comprises a first shell (111) and a second shell (112); the first shell (111) and the second shell (112) are fixedly connected and enclose the cavity (113) and an air outlet (114) communicating with the cavity (113).

10. The drying fan according to any one of claims 1 to 6, characterized in that: The box body (21) comprises a bottom shell (211) and a cover body (212); the bottom shell (211) and the cover body (212) are arranged to form a receiving cavity (2111); the side wall of the receiving cavity (2111) is provided with the wire hole (2112); the control board (22) is arranged in the receiving cavity (2111); and the cover body (212) is covered on the bottom shell (211).

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