Adjustable wind direction double-layer rectification and water-cooled temperature control external cooling device

Abstract

The application belongs to the technical field of melt spinning cooling equipment, and discloses a double-layer rectification and water cooling temperature control external cooling device with adjustable air direction, which comprises a device shell installed at the air outlet of an external air blowing device, a rectification assembly comprising a first rectification member and a second rectification member, which are respectively installed on the two sides of the device shell, wherein the first rectification member is installed on the side of the device shell close to the air blowing device, and the first rectification member and the second rectification member form a double-layer rectification structure to rectify the air outlet of the air blowing device, a water cooling assembly comprising a water tank and a cooling member, the water tank stores a cooling medium and is communicated with the first rectification member to form a circulation path, which is used to cool the air passing through the first rectification member, and the cooling member is arranged on the water tank and used to cool the cooling medium in the water tank, and a control assembly installed on the device shell and used to control the air outlet temperature. The application has the advantages of good rectification effect, high cooling efficiency, adjustable temperature, stable structure, convenient disassembly and assembly, and strong adaptability.

Description

Technical Field

[0001] This invention belongs to the technical field of melt spinning cooling equipment, and in particular, an external cooling device with adjustable airflow direction, double-layer rectification, and water-cooled temperature control. Background Technology

[0002] Melt spinning is the most mainstream and efficient forming method for chemical fibers. The core principle is to heat thermoplastic polymers to a molten state, extrude them through a spinneret, and then cool and solidify them directly into fibers.

[0003] Since chemical spinning is obtained through melt extrusion, it requires cooling treatment of the yarn compared to conventional silk or silk thread spinning to achieve high-quality yarn. There are two main types of air cooling in chemical spinning: ring-blowing cooling and side-blowing cooling. Ring-blowing cooling involves arranging air outlets around the yarn, providing uniform airflow and good cooling effect, but it is not suitable for large-scale production and is generally used in laboratory settings. Side-blowing cooling, on the other hand, has air outlets installed on both sides of the yarn, providing a large air volume, fast cooling speed, and higher efficiency, making it suitable for large-scale production and the most common cooling method.

[0004] However, due to variations in melt spinning equipment, direct airflow from the blower outlet often results in turbulent airflow and uneven wind speed, leading to poor cooling and impacting product quality. Furthermore, existing cooling devices are mostly S-type heat exchange coils or atomized water vapor blowing cooling. The former may result in insufficient cooling, with noticeable localized strong and weak airflow after cooling, making subsequent airflow rectification difficult. The latter significantly increases ambient humidity and consumes more energy, making it suitable only for specific situations. In experiments, the blower on the spinning machine frequently fails to reach the cooling temperature of the spun material, causing the spun fibers to fall short of expected performance standards. In addition, some air-controlled cooling devices have unreasonable structural designs, with loosely installed components, difficult disassembly, and challenging maintenance, further affecting production continuity and ease of use.

[0005] Therefore, there is an urgent need for an external cooling device with adjustable airflow direction, dual-layer rectification, and water-cooled temperature control to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide an external cooling device with adjustable airflow direction, dual-layer rectification, and water-cooled temperature control, in order to solve the problems existing in the prior art.

[0007] To achieve the above objectives, the present invention provides the following solution: The present invention provides an external cooling device with adjustable airflow direction, dual-layer rectification, and water-cooled temperature control, comprising: The device housing is installed at the air outlet of the external blower; A rectifier assembly is installed inside the device housing. The rectifier assembly includes a first rectifier and a second rectifier, which are respectively installed on both sides of the device housing. The first rectifier is installed on the side of the device housing closer to the blower. The first rectifier and the second rectifier form a double-layer rectification structure to rectify the airflow from the blower. A water-cooled assembly includes a water tank and a cooling component. The water tank stores a cooling medium and is connected to a first rectifier to form a circulation path for cooling the air passing through the first rectifier. The cooling component is disposed on the water tank for cooling the cooling medium in the water tank. A control component, mounted on the housing of the device, is used to control the outlet air temperature.

[0008] Preferably, the device housing includes a device outer shell, a rectifier channel, and a device rear cover. The device outer shell and the device rear cover are spliced ​​together to form a housing structure. The rectifier channel is located inside the housing structure. The first rectifier and the second rectifier are respectively installed on the device rear cover and the device outer shell through the rectifier channel.

[0009] Preferably, the first rectifier includes a hollow rectifier plate, which has a plurality of frustum-shaped through holes and a first extended boss that is adapted to a first groove on the rectifier channel. The rear cover of the device has a first circular hole in the middle that is adapted to the hollow rectifier plate.

[0010] Preferably, the second rectifier includes a pinhole rectifier plate with a first rounded corner that matches a first circular groove on the rectifier channel. The outer casing of the device has a second circular groove that forms an arc groove with the first circular groove and the second circular groove. The first rounded corner slides in contact with the arc groove. The outer casing has a second circular hole in the middle that matches the pinhole rectifier plate.

[0011] Preferably, the cooling component includes a semiconductor cooling chip, which is fixedly connected to the outer wall of the water tank.

[0012] Preferably, one end of the delivery pipe and one end of the return pipe are fixedly connected to the hollow rectifier plate, the input end of the pump body is connected to the water tank through a pipe, the other end of the delivery pipe is connected to the output end of the pump body, and the other end of the return pipe is connected to the water tank.

[0013] Preferably, the control component includes a temperature and humidity sensor, a control module, and an OLED display screen. A square groove is provided on the side of the rectifier channel, the temperature and humidity sensor is installed in the square groove, the OLED display screen is installed on the top of the device housing, the temperature and humidity sensor is electrically connected to the OLED display screen, the control module is installed on the rectifier channel, and the temperature and humidity sensor and the semiconductor cooling chip are respectively electrically connected to the control module.

[0014] Preferably, threaded holes are provided at the four corners of the device housing and the device rear cover, and bolts are installed in the threaded holes.

[0015] Preferably, it also includes a hook connection structure disposed on the rear cover of the device. The hook connection structure includes a plurality of hook holes respectively opened on the rear cover of the device. The rear cover of the device is engaged with the air outlet of the blower through the hook holes.

[0016] Preferably, the device also includes a magnetic connection structure disposed on the rear cover of the device. The magnetic connection structure includes multiple permanent magnet boxes, which are fixedly connected to the rear cover of the device in the circumferential direction. Permanent magnets are fixedly connected inside the permanent magnet boxes, and the permanent magnets are magnetically connected to the outer shell of the device.

[0017] Compared with the prior art, the present invention has the following advantages and technical effects: This invention provides an external cooling device with adjustable airflow direction, dual-layer rectification, and water-cooled temperature control. The dual-layer rectification structure can perform secondary rectification of the air outlet of the blower, effectively streamlining turbulent airflow and ensuring uniform airflow distribution, avoiding problems of insufficient or excessive cooling in certain areas. Simultaneously, the blowing direction can be adjusted according to actual usage conditions, making it particularly suitable for scenarios with high requirements for cooling uniformity, such as melt spinning, significantly improving product processing quality. The addition of a water-cooling component allows for precise adjustment of the cooling medium temperature, thereby controlling the outlet air temperature and adapting to cooling needs in different scenarios. Compared to traditional air-cooling methods, it offers higher cooling efficiency, rapidly reducing outlet air temperature and improving production efficiency. The device has a simple overall structure design with few components, controllable cost, and is easy to mass-produce. It can be directly installed at the air outlet of various blowers without significant modifications to existing blowers, offering wide applicability and strong practicality. The scientific and reasonable connection method of each component results in a robust overall structure, enabling long-term stable operation, stable cooling efficiency, low energy consumption, and effective prevention of cooling medium leakage, further enhancing the device's service life and operational stability. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is an exploded view of the structure of the present invention; Figure 3 This is a schematic diagram of the water-cooling component structure of the present invention; Figure 4 This is a schematic diagram of the outer casing structure of the device of the present invention; Figure 5 This is a schematic diagram of the rectifier channel structure of the present invention; Figure 6 This is a schematic diagram of the rear cover structure of the device of the present invention; Figure 7 This is a schematic diagram of the assembly structure of the first rectifier plate of the device of the present invention; Figure 8 This is a schematic diagram of the assembly structure of the orifice rectifier plate of the present invention; The components include: 1. Device housing; 2. OLED display screen; 3. Small-hole rectifier plate; 4. Rectification channel; 5. Hollow rectifier plate; 6. Semiconductor cooling chip; 7. Pump body; 8. Delivery pipe; 9. Water tank; 10. Return pipe; 11. Permanent magnet; 12. Device rear cover; 13. Hook hole; 14. Permanent magnet box; 15. Control module; 16. Temperature and humidity sensor. Detailed Implementation

[0020] 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. 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.

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Reference Figures 1-8 This invention provides an external spinning cooling blower with adjustable airflow direction, double-layer rectification, and water-cooled temperature control, comprising: The device housing is installed at the air outlet of the external blower; A rectifier assembly is installed inside the device housing. The rectifier assembly includes a first rectifier and a second rectifier, which are respectively installed on both sides of the device housing. The first rectifier is installed on the side of the device housing closer to the blower. The first rectifier and the second rectifier form a double-layer rectification structure to rectify the air outlet of the blower. The water-cooled assembly includes a water tank 9 and a cooling component. The water tank 9 stores a cooling medium and is connected to a first rectifier to form a circulation path for cooling the air passing through the first rectifier. The cooling component is installed on the water tank 9 for cooling the cooling medium in the water tank 9. The control component, mounted on the device housing, is used to control the outlet air temperature.

[0023] In one embodiment of the present invention, the double-layer rectification structure can perform secondary rectification of the air outlet of the blower, effectively sorting out the turbulent airflow, making the air velocity distribution uniform, avoiding local insufficient or excessive cooling, and precisely adjusting the temperature of the cooling medium through the water-cooling component, thereby controlling the air outlet temperature. The number of parts is small and the cost is controllable. It can be directly installed at the air outlet of various blowers without major modification to the original equipment. The connection of each component is scientific and reasonable, and the structure is stable.

[0024] As an optional implementation, the device housing includes a device outer shell 1, a rectifier channel 4, and a device rear cover 12. The device outer shell 1 and the device rear cover 12 are spliced ​​together to form a housing structure. The rectifier channel 4 is located inside the housing structure. The first rectifier and the second rectifier are respectively installed on the device rear cover 12 and the device outer shell 1 through the rectifier channel 4.

[0025] In one embodiment of the present invention, the hollow rectifier plate 5 has an overall structure consisting of two protrusions, one high and one low, namely a 10mm high protrusion and a 2mm high extended protrusion. The 2mm high extended protrusion surrounds the 10mm high protrusion. The two protrusions are distributed with frustum holes with an upper bottom diameter of 6mm and a lower bottom diameter of 10mm. The frustum holes are distributed outward in a ring shape with the center of the protrusion as the center. The direct distance between the centers of the frustum holes in each layer is 30mm. The 2mm high extended protrusion is adapted to the groove at the rear of the rectifier channel 4 and can be stably placed in the groove at the rear of the rectifier channel 4. The square top of the device rear cover 12 is installed in conjunction with the rectifier channel 4, which not only ensures the fixed stability of the hollow rectifier plate 5, but also ensures that the airflow can flow in smoothly. The hollow rectifier plate integrates gas cooling and rectification. It is made of aluminum alloy and has strong heat exchange capacity. The truncated cone holes increase the contact area, making the cooling more thorough and less likely to occur. It is less likely to cause insufficient or uneven cooling, or obvious local wind strong and local wind weak after cooling. The subsequent airflow rectification is also less likely to cause local wind force differences, making it suitable for most situations.

[0026] As an optional implementation, the first rectifier includes a hollow rectifier plate 5, which has multiple frustum-shaped through holes and a first extended boss that is adapted to the first groove on the rectifier channel 4. The device rear cover 12 has a first circular hole in the middle that is adapted to the hollow rectifier plate 5.

[0027] As an optional implementation, the second rectifier includes a small-hole rectifier plate 3, which has a first rounded corner that is adapted to a first circular groove on the rectifier channel 4. The device housing 1 has a second circular groove, which forms an arc-shaped groove with the first circular groove. The first rounded corner slides in contact with the arc-shaped groove. The device housing 1 has a second circular hole in the middle, which is adapted to the small-hole rectifier plate 3.

[0028] In one embodiment of the present invention, a circular groove is formed in the middle of the outer shell 1 of the device. This circular groove cooperates with the first circular groove of the rectifier channel 4 to form a semi-circular track, fixing the small-hole rectifier plate 3 and allowing the small-hole rectifier plate 3 to rotate 1-20° within it through the first rounded corner, thereby controlling the blowing direction. A square groove is formed inside the outer shell 1. This square groove cooperates with the rectifier channel 4 to further improve the fixing effect of the small-hole rectifier plate 3 and ensure smooth airflow. The overall structure of the small-hole rectifier plate 3 is 2mm high, with a 1mm radius rounded corner extending outward. The small-hole rectifier plate 3 has holes with a diameter of 2mm distributed on it. The holes are distributed outward in a ring shape around the center of the small-hole rectifier plate 3, with a direct distance of 3mm between the centers of each layer of holes. The small-hole rectifier plate and the hollow rectifier plate are installed using a boss-groove snap-fit ​​installation, which is independent of bolts and threaded holes, making it less prone to damage, easy to install and disassemble, and preventing thread stripping and bolt loss, thus facilitating maintenance.

[0029] As an optional implementation, the cooling component includes a semiconductor cooling chip 6, which is fixedly connected to the outer wall of the water tank 9.

[0030] In one embodiment of the present invention, the semiconductor cooling chip 6 is used to cool the cooling medium in the water tank 9.

[0031] As an optional implementation, one end of the delivery pipe 8 and one end of the return pipe 10 are fixedly connected to the hollow rectifier plate 5. The delivery pipe extends to the bottom of the hollow rectifier plate. The input end of the pump body 7 is connected to the water tank 9 via a pipe. The other end of the delivery pipe 8 is connected to the output end of the pump body 7, and the other end of the return pipe 10 is connected to the water tank 9. The delivery pipe is fixedly connected to both ends of the side holes of the hollow rectifier plate through the side holes of the device housing, and the return pipe is fixedly connected to both ends of the top holes of the hollow rectifier plate through the middle hole of the device housing.

[0032] In one embodiment of the present invention, the pump body 7 transports the cooled medium in the water tank 9 to the interior of the hollow rectifier plate 5 through the conveying pipe 8. During the flow of the cooling medium in the hollow rectifier plate 5, it exchanges heat with the airflow passing through the hollow rectifier plate 5 to achieve airflow cooling. After the heat exchange is completed, the cooling medium flows back to the water tank 9 through the return pipe 10 and is cooled again by the semiconductor cooling chip 6. The cycle is repeated to continuously achieve the cooling function. The top of the hollow rectifier plate 5 has an 8mm hole that is connected to the water tank 9 through the return pipe 10, and the side has an 8mm hole that is connected to the conveying pipe 8.

[0033] As an optional implementation, the control components include a temperature and humidity sensor 16, a control module 15, and an OLED display 2. A square groove is provided on the side of the rectifier channel 4, and the temperature and humidity sensor 16 is installed in the square groove. The OLED display 2 is installed on the top of the device housing 1, and the temperature and humidity sensor 16 is electrically connected to the OLED display 2. The control module 15 is installed on the rectifier channel 4, and the temperature and humidity sensor 16 and the semiconductor cooling chip 6 are respectively electrically connected to the control module 15.

[0034] In one embodiment of the present invention, a square hole is opened in the middle of one side of the rectifier channel 4, and a temperature and humidity sensor 16 is installed inside the hole to detect the internal temperature of the rectifier channel 4. The temperature and humidity sensor 16 transmits the signal to the control module 15 by detecting the temperature of the cooling air flowing in the rectifier channel 4. The control module 15 then adjusts the temperature of the cooling medium by controlling the semiconductor cooling chip 6. An OLED display screen 2 is installed on the top of the device housing 1 to display the airflow temperature inside the rectifier channel 4, thereby realizing precise control of the outlet air temperature of the external spinning cooling blower with double-layer rectification and water-cooled temperature control.

[0035] As an optional implementation, threaded holes are provided on the four corners of the device housing 1 and the device rear cover 12, and bolts are installed in the threaded holes.

[0036] In one embodiment of the present invention, the outer shell 1 and the rear cover 12 of the device are connected by four threaded holes around their perimeter. The threaded connection method can not only achieve a firm fixation between the two and ensure the stability of the overall structure of the device, but also facilitate subsequent disassembly and maintenance and improve the ease of use.

[0037] As an optional implementation, a hook connection structure is also included, which is provided on the rear cover 12 of the device. The hook connection structure includes a plurality of hook holes 13, which are respectively opened on the rear cover 12 of the device. The rear cover 12 of the device is engaged with the air outlet of the blower through the hook holes 13.

[0038] In one embodiment of the present invention, the hook hole 13 is located on the upper side of the rear cover 12 of the device and is used to engage and hang with the air outlet of the blower.

[0039] As an optional implementation, a magnetic connection structure is also included, which is disposed on the rear cover 12 of the device. The magnetic connection structure includes a plurality of permanent magnet boxes 14, which are fixedly connected to the rear cover 12 of the device in the circumferential direction. A permanent magnet 11 is fixedly connected inside the permanent magnet box 14, and the permanent magnet 11 is magnetically connected to the outer shell 1 of the device.

[0040] In one embodiment of the present invention, the permanent magnet 11 is embedded in the permanent magnet box 14 on the outside of the rear cover 12 of the device, for magnetic fixation with the metal shell of the blower.

[0041] This invention offers superior airflow control and significantly improved cooling uniformity. The dual-layer rectification structure, consisting of a perforated rectifier plate and a hollow rectifier plate, provides secondary rectification of the airflow from the blower, effectively streamlining turbulent airflow and ensuring uniform airflow distribution. This prevents localized insufficient or excessive cooling. The adjustable airflow direction of the perforated rectifier plate allows for application in various flexible production scenarios, particularly suitable for melt-spun profiled fibers and other applications requiring high cooling uniformity, thus significantly improving product processing quality.

[0042] Adjustable cooling temperature and high cooling efficiency: The addition of a water-cooling mechanism allows for precise adjustment of the cooling medium temperature via a semiconductor refrigeration chip, thereby controlling the outlet air temperature and adapting to cooling needs in different scenarios; the direct heat exchange between the hollow rectifier plate and the cooling medium results in higher cooling efficiency compared to traditional air-cooling methods, enabling rapid reduction of outlet air temperature and improved production efficiency.

[0043] Simple structure and strong adaptability: The overall structure of the device is simple, with few parts and controllable cost, making it easy to mass-produce; it can be directly installed at the air outlet of various blowers without requiring major modifications to the original blowers, making it widely adaptable and highly practical.

[0044] High stability and long service life: The connection method of each component is scientific and reasonable, the overall structure is stable, and it can operate stably for a long time; the semiconductor cooling chip has stable cooling efficiency and low energy consumption, and the structural design of the water tank and hollow rectifier plate can effectively avoid the leakage of cooling medium, further improving the service life and operational stability of the device.

[0045] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to 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 of this invention.

[0046] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. An external cooling device with adjustable airflow direction, featuring dual-layer rectification and water-cooled temperature control, characterized in that... include: The device housing is installed at the air outlet of the external blower; A rectifier assembly is installed inside the device housing. The rectifier assembly includes a first rectifier and a second rectifier, which are respectively installed on both sides of the device housing. The first rectifier is installed on the side of the device housing closer to the blower. The first rectifier and the second rectifier form a double-layer rectification structure to rectify the airflow from the blower. The water-cooled assembly includes a water tank (9) and a cooling component. The water tank (9) stores a cooling medium and is connected to the first rectifier to form a circulation path for cooling the air passing through the first rectifier. The cooling component is disposed on the water tank (9) for cooling the cooling medium in the water tank (9). A control component, mounted on the housing of the device, is used to control the outlet air temperature.

2. The external cooling device with adjustable airflow direction, dual-layer rectification, and water-cooled temperature control according to claim 1, characterized in that: The device housing includes a device outer shell (1), a rectifier channel (4), and a device rear cover (12). The device outer shell (1) and the device rear cover (12) are spliced ​​together to form a housing structure. The rectifier channel (4) is located inside the housing structure. The first rectifier and the second rectifier are respectively installed on the device rear cover (12) and the device outer shell (1) through the rectifier channel (4).

3. The external cooling device with adjustable airflow direction, dual-layer rectification, and water-cooled temperature control according to claim 2, characterized in that: The first rectifier includes a hollow rectifier plate (5), which has multiple frustum-shaped through holes. The hollow rectifier plate (5) is provided with a first extended boss, which is adapted to the first groove on the rectifier channel (4). The device rear cover (12) has a first round hole in the middle, which is adapted to the hollow rectifier plate (5).

4. The external cooling device with adjustable airflow direction, dual-layer rectification, and water-cooled temperature control according to claim 2, characterized in that: The second rectifier includes a small-hole rectifier plate (3), which has a first rounded corner that is adapted to a first circular groove on the rectifier channel (4). The device housing (1) has a second circular groove that forms an arc groove with the first circular groove and the second circular groove. The first rounded corner slides in contact with the arc groove. The device housing (1) has a second circular hole in the middle that is adapted to the small-hole rectifier plate (3).

5. An external cooling device with adjustable airflow direction, dual-layer rectification, and water-cooled temperature control according to claim 2, characterized in that: The cooling component includes a semiconductor cooling chip (6), which is fixedly connected to the outer wall of the water tank (9).

6. An external cooling device with adjustable airflow direction, dual-layer rectification, and water-cooled temperature control according to claim 3, characterized in that: One end of the delivery pipe (8) and one end of the return pipe (10) are fixedly connected to the hollow rectifier plate (5). The input end of the pump body (7) is connected to the water tank (9) through a pipe. The other end of the delivery pipe (8) is connected to the output end of the pump body (7). The other end of the return pipe (10) is connected to the water tank (9).

7. An external cooling device with adjustable airflow direction, dual-layer rectification, and water-cooled temperature control according to claim 5, characterized in that: The control components include a temperature and humidity sensor (16), a control module (15), and an OLED display screen (2). A square groove is provided on the side of the rectifier channel (4). The temperature and humidity sensor (16) is installed in the square groove. The OLED display screen (2) is installed on the top of the device housing (1). The temperature and humidity sensor (16) is electrically connected to the OLED display screen (2). The control module (15) is installed on the rectifier channel (4). The temperature and humidity sensor (16) and the semiconductor cooling chip (6) are electrically connected to the control module (15) respectively.

8. An external cooling device with adjustable airflow direction, dual-layer rectification, and water-cooled temperature control according to claim 2, characterized in that: The outer casing (1) of the device and the rear cover (12) of the device are provided with threaded holes at the four corners, and bolts are provided in the threaded holes.

9. An external cooling device with adjustable airflow direction, dual-layer rectification, and water-cooled temperature control according to claim 2, characterized in that: It also includes a hook connection structure, which is set on the rear cover (12) of the device. The hook connection structure includes a plurality of hook holes (13), which are respectively opened on the rear cover (12) of the device. The rear cover (12) of the device is engaged with the air outlet of the blower through the hook holes (13).

10. An external cooling device with adjustable airflow direction, dual-layer rectification, and water-cooled temperature control according to claim 2, characterized in that: It also includes a magnetic connection structure, which is set on the rear cover (12) of the device. The magnetic connection structure includes multiple permanent magnet boxes (14), which are fixedly connected to the rear cover (12) of the device in the circumferential direction. A permanent magnet (11) is fixedly connected inside the permanent magnet box (14), and the permanent magnet (11) is magnetically connected to the outer shell (1) of the device.

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