Cast film electric heater with detachable core body

Abstract

The utility model discloses a cast film electric heater with a detachable core body, which comprises a shell, a heating core body is arranged in the shell, and the heating core body is movably connected with the shell in a detachable manner; the heating core body comprises a core body shell, a plurality of heating pipes which are transversely and / or longitudinally arranged are arranged in the core body shell, the heating pipes are U-shaped, and the two ends of each heating pipe are fixed to the core body shell; guide rails are symmetrically arranged at the bottom of the installation cavity, idler wheels matched with the guide rails are arranged at the bottom of the core shell, and when the heating core is movably connected with the shell, the idler wheels roll on the guide rails. According to the utility model, the heating core body is connected with the shell in a rolling manner, so that the heating core body can be quickly replaced, the maintenance time is saved, and the maintenance difficulty is also reduced. In addition, the guide rail is used for guiding when the heating core body is assembled and disassembled, and the heating core body is prevented from being clamped in the assembling and disassembling process. Therefore, the heating core moves more stably and smoothly, and the overall performance and stability of the device are improved.

Description

Technical Field

[0001] The utility model belongs to the field of electric heaters, and in particular relates to a cast film electric heater with a detachable core. Background Art

[0002] In film extrusion production, cast film technology is widely used due to its high processing precision and material performance advantages. However, existing cast film electric heater cores are typically fixed and non-removable inside the equipment, significantly limiting maintenance convenience. In the event of a malfunction or maintenance, operators often have difficulty directly accessing the core. This design requires maintenance personnel to spend a considerable amount of time and effort disassembling surrounding components, which not only increases maintenance costs but also easily damages other parts of the equipment during disassembly.

[0003] Prior art, such as patent publication CN221659881U, discloses a cast drying system for polyvinyl alcohol film. The system includes a hot air device comprising an air induction unit and a heating unit (equivalent to a heater). Air is heated by the heating unit to form a hot air flow. However, the heating unit is an integrated design, and the internal heating element (equivalent to the core) used for heating is not removable. When the heating element is damaged and needs to be replaced, it is difficult to disassemble, making maintenance inconvenient. Summary of the Invention

[0004] In response to the problems in the prior art, the utility model proposes a cast film electric heater with a detachable core. The heating core is connected to the shell by rolling, so that the heating core can be removed from the shell, and the heating core is guided by a guide rail, thereby improving the convenience of installing and disassembling the heating core.

[0005] The present utility model is implemented as follows: a cast film electric heater with a detachable core, comprising a shell, the interior of the shell being hollow to form an installation cavity, a heating core being provided in the installation cavity, one side of the installation cavity being open to form an entrance and exit adapted to the heating core, the heating core passing through the entrance and exit from the outside to the inside, and being movably connected to the shell in a detachable manner; when the heating core fails due to long-term use, there is no need to disassemble the entire heater shell, and the heating core can be simply taken out from the entrance and exit and replaced with a new one, which saves maintenance time and reduces the difficulty of maintenance. In addition, when the heating core needs to be updated, the detachable design allows users to easily replace it with a more advanced heating core without having to replace the entire heater, thereby enhancing the flexibility and adaptability of the equipment.

[0006] The heating core includes a core shell, within which are located a plurality of heating tubes arranged transversely and / or longitudinally. The heating tubes are U-shaped, with both ends of the heating tubes fixed to the core shell. The U-shaped heating tube design allows for more uniform heat distribution within the heating core. Compared to straight heating tubes, the U-shaped structure utilizes space more efficiently, ensuring even heat distribution throughout the heating core. Furthermore, the curved shape of the U-shaped heating tubes increases the contact area with the surrounding medium (such as air), thereby improving heat exchange efficiency.

[0007] The bottom of the mounting cavity is provided with symmetrically arranged guide rails, and the bottom of the core housing is provided with rollers adapted to the guide rails. When the heating core is movably connected to the housing, the rollers roll on the guide rails. The guide rails are used to guide the heating core during installation and removal, preventing it from getting stuck during installation and removal. Compared to traditional sliding contact, the rolling of the rollers on the guide rails significantly reduces frictional resistance. At the same time, the rolling contact between the rollers and the guide rails reduces bumps and vibrations during movement, making the core movement smoother and more stable, thereby improving the overall performance and stability of the device.

[0008] The guide rail is made of sheet metal and is in an inverted V shape. A V-shaped groove is provided on the circumference of the roller. The V-shaped groove is adapted to the guide rail, ensuring that the contact area is more concentrated and uniform when the roller moves on the guide rail. At the same time, the adaptation of the inverted V-shaped guide rail and the V-shaped groove not only provides a stable guiding effect, but also can automatically adjust the position of the roller during movement, so that it always remains on the optimal path, thereby improving the smoothness of the overall movement.

[0009] The port of the heating pipe is located on the side of the heating core corresponding to the inlet and outlet; the heating core is also provided with a protective cover that completely covers the port of the heating pipe. The port of the heating pipe is a high-temperature area, and direct exposure to the outside can easily pose a risk of burns to users or operators. By providing a protective cover on the heating core that completely covers the port of the heating pipe, the high-temperature area can be effectively isolated, preventing direct contact between users and operators, thereby significantly reducing the risk of burns and improving the safety of the heating core.

[0010] The protective cover is also provided with multiple conductive plates connected to the heating pipes, and each conductive plate is connected to the same end of a different heating pipe, thereby realizing centralized power supply management of the heating pipes, reducing the number and complexity of power supply lines, making the power supply line layout in the protective cover more concise and clear, and reducing the difficulty of installation and maintenance.

[0011] Preferably, the heating core further includes a heat preservation unit corresponding to the heating tube, the heat preservation unit being mounted at the port of the heating tube and fixedly connected to the core shell. When the heating tube is operating, the port of the heating tube also generates heat, but the heat therein cannot be effectively utilized, thereby increasing the heat loss of the heating tube. The heat preservation unit is used to reduce the rate of heat dissipation at the port of the heating tube, thereby reducing the amount of heat dissipated at the port of the heating tube and improving the heat utilization rate of the heating tube.

[0012] Preferably, the shell and core shell are open on the sides, forming a first air inlet and a second air inlet on either side of the shell, respectively, and a second air inlet and a second air outlet on either side of the core shell. When the cast film electric heater is in operation, a cold air flow flows sequentially through the first air inlet, the second air inlet, the heating tube, the second air outlet, and the first air outlet to form a hot air flow. The first air inlet, the first air outlet, the second air inlet, and the second air outlet create a hollow space between the shell and the core shell, thereby completely exposing the heating tube to the outside world. This increases the contact area between the airflow and the heating tube, thereby promoting heat transfer from the heating tube to the airflow and improving the heating speed and uniformity.

[0013] Specifically, the first air inlet and the first air outlet are provided with a plurality of reinforcing ribs, each of which connects adjacent edges of the first air inlet and the first air outlet to form a triangular structure. Triangles are known for their excellent stability in geometry, and the triangular structure formed by the reinforcing ribs can significantly enhance the structural strength of this area, effectively resisting external pressure, vibration, or impact, and improving the structural stability and durability of the entire heater.

[0014] Specifically, a triangular plate is provided at the junction of the second air inlet and the second air outlet. The triangular plate is an isosceles right triangle, with the right-angled sides of the triangular plate connected to the adjacent edges of the second air inlet and the second air outlet. The triangular plate forms a triangular reinforcement structure at the edges of the second air inlet and the second air outlet, thereby improving the structural stability and durability of the entire heating core.

[0015] Specifically, the bottom of the protective cover is provided with multiple cable holes, through which the cables supplying power to the heating pipes enter the protective cover and are electrically connected to the conductive plate. The sides, top, and front of the protective cover are provided with multiple heat dissipation holes, which connect the interior of the protective cover with the outside world. These cable holes allow the cables supplying power to the heating pipes to enter the protective cover in an orderly and neat manner, further simplifying the layout of the power supply lines within the protective cover and reducing the difficulty of cable installation and maintenance.

[0016] Preferably, the housing is also provided with a plurality of lifting rings welded to the top of the housing. These lifting rings allow the cast film electric heater to be transported using lifting equipment, significantly increasing handling speed. Furthermore, the lifting rings are welded to the top of the housing, providing a stable lifting point for hoisting, reducing shaking or tilting of the housing during handling and the risk of accidental dropping.

[0017] Preferably, the conductive plate is made of copper, which has an electrical conductivity of up to 5.85 million Siemens per meter, ensuring stable current transmission, reducing energy loss, and improving the operating efficiency of the heating pipe.

[0018] Preferably, the heating tube is connected to the core shell by bolts, making the assembly process between the two simple and clear. The operator only needs to tighten the bolts one by one according to the predetermined bolt hole positions to complete the assembly, without the need for complicated welding or other fixing processes, thereby greatly reducing the installation difficulty and time cost.

[0019] Beneficial effects of the utility model:

[0020] The utility model uses a rolling connection between the heating core and the housing. When the heating core needs to be maintained, it is simply removed from the access port and replaced with a new one. This saves maintenance time and reduces maintenance difficulty. In addition, the guide rail guides the heating core during installation and removal, preventing it from getting stuck during installation and removal. This makes the movement of the heating core smoother and more stable, improving the overall performance and stability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a side cross-sectional view of a hidden portion of the heating tube of the cast film electric heater of the present invention;

[0022] Figure 2 This is a top cross-sectional view of the cast film electric heater of the present invention;

[0023] Figure 3 This is a front view of the cast film electric heater with a hidden protective door according to the present invention;

[0024] Figure 4 for Figure 3 Enlarged schematic diagram of point a.

[0025] Reference numerals:

[0026] 1. Shell; 2. Heating core; 11. Guide rail; 12. Reinforcement rib; 13. Lifting ring; 21. Heating tube; 22. Insulation unit; 23. Roller; 24. Protective cover; 25. Wire hole; 26. Conductive plate; 27. Triangular plate. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] like Figure 1-Figure 4 As shown, a cast film electric heater with a detachable core includes a shell 1, the interior of the shell 1 is hollow to form an installation cavity, a heating core 2 is provided in the installation cavity, one side of the installation cavity is open to form an entrance and exit adapted to the heating core 2, the heating core 2 passes through the entrance and exit from the outside to the inside, and is movably connected to the shell 1 in a detachable manner; when the heating core 2 fails due to long-term use, there is no need to disassemble the entire heater shell 1, and the heating core 2 can be simply taken out from the entrance and exit and replaced with a new one, which saves maintenance time and reduces maintenance difficulty. In addition, when the heating core 2 needs to be upgraded, the detachable design allows users to easily replace it with a more advanced heating core 2 without replacing the entire heater, thereby enhancing the flexibility and adaptability of the equipment.

[0029] In this embodiment, the housing 1 is further provided with a plurality of lifting rings 13, which are welded to the top of the housing 1. These lifting rings 13 allow the cast film electric heater to be transported using lifting equipment, significantly increasing handling speed. Furthermore, the lifting rings 13 are welded to the top of the housing 1, providing a stable lifting point for hoisting, reducing shaking or tilting of the housing 1 during transportation and the risk of accidental dropping.

[0030] The heating core 2 includes a core shell, within which are disposed a plurality of heating tubes 21 arranged transversely and longitudinally. The heating tubes 21 are U-shaped, with both ends of the heating tubes 21 secured to the core shell. The U-shaped heating tubes 21 distribute heat more evenly within the heating core 2. Compared to linear heating tubes 21, the U-shaped structure utilizes space more efficiently, ensuring even heat distribution throughout the heating core 2. Furthermore, the curved shape of the U-shaped heating tubes 21 increases the contact area with the surrounding medium (e.g., air), thereby improving heat exchange efficiency.

[0031] In this embodiment, the port of the heating tube 21 is located on the side of the heating core 2 corresponding to the inlet and outlet. A protective cover 24 is also provided on the heating core 2, completely covering the port of the heating tube 21. The port of the heating tube 21 is a high-temperature area, and direct exposure to the outside can easily pose a risk of burns to users or operators. By providing the protective cover 24 on the heating core 2 and completely covering the port of the heating tube 21, the high-temperature area can be effectively isolated, preventing direct contact between users and operators, thereby significantly reducing the risk of burns and improving the safety of the heating core 2.

[0032] Specifically, a plurality of conductive plates 26 connected to the heating tubes 21 are further provided in the protective cover 24. Each conductive plate 26 is connected to the same end of a different heating tube 21, thereby realizing centralized power supply management of the heating tubes 21, reducing the number and complexity of power supply lines, making the power supply line layout in the protective cover 24 more concise and clear, and reducing the difficulty of installation and maintenance.

[0033] In this embodiment, the conductive plate 26 is made of copper. Copper has an electrical conductivity of approximately 5.85 million Siemens / meter, which can ensure stable current transmission, reduce energy loss, and improve the operating efficiency of the heating tube 21.

[0034] Specifically, the bottom of the protective cover 24 is provided with a plurality of cable holes 25. The cables that power the heating tubes 21 enter the protective cover 24 through these cable holes 25 and are electrically connected to the conductive plate 26. The sides, top, and front surfaces of the protective cover 24 are provided with a plurality of heat dissipation holes that connect the interior of the protective cover 24 with the outside world. These cable holes 25 allow the cables that power the heating tubes 21 to enter the protective cover 24 in an orderly and neat manner, further simplifying the layout of the power supply lines within the protective cover 24 and reducing the difficulty of cable installation and maintenance.

[0035] In this embodiment, the protective cover 24 includes a detachable protective door, which is located on the side of the protective cover 24 opposite the end of the heating pipe 21. The detachable protective door allows maintenance personnel to quickly perform maintenance without disassembling the entire protective cover 24, greatly reducing maintenance time and improving work efficiency.

[0036] Specifically, the heating tube 21 is connected to the core shell by bolts, making the assembly process between the two simple and clear. The operator only needs to tighten the bolts one by one according to the predetermined bolt hole positions to complete the assembly, without the need for complicated welding or other fixing processes, thereby greatly reducing the installation difficulty and time cost.

[0037] In this embodiment, the heating core 2 also includes a heat preservation unit 22 corresponding to the heating tube 21. The heat preservation unit 22 is installed at the end of the heating tube 21 and is fixed to the core shell. When the heating tube 21 is in operation, the end of the heating tube 21 is also in a heating state, but the heat there cannot be effectively utilized, increasing the heat loss of the heating tube 21. The heat preservation unit 22 is used to reduce the rate of heat dissipation at the end of the heating tube 21, thereby reducing the heat dissipated at the end of the heating tube 21 and improving the heat utilization rate of the heating tube 21.

[0038] In this embodiment, the heat preservation unit 22 is a heat preservation board.

[0039] In this embodiment, the shell 1 and the core shell are open on the sides, forming a first air inlet and a second air inlet on each side of the shell 1, and a second air inlet and a second air outlet on each side of the core shell. When the cast film electric heater is in operation, the cold air flows through the first air inlet, the second air inlet, the heating tube 21, the second air outlet, and the first air outlet in sequence, forming a hot air flow. The first air inlet, the first air outlet, the second air inlet, and the second air outlet hollow out the shell 1 and the core shell, thereby completely exposing the heating tube 21 to the outside world, increasing the contact area between the airflow and the heating tube 21, thereby promoting the transfer of heat from the heating tube 21 to the airflow, and improving the heating speed and uniformity.

[0040] Specifically, a plurality of reinforcing ribs 12 are provided at the first air inlet and the first air outlet. Each of the reinforcing ribs 12 simultaneously connects adjacent edges of the first air inlet and the first air outlet to form a triangular structure. Triangles are known for their excellent stability in geometry. The triangular structure of the reinforcing ribs 12 can significantly enhance the structural strength of this area, effectively resisting external pressure, vibration, or impact, and improving the structural stability and durability of the entire heater.

[0041] Specifically, a triangular plate 27 is provided at the junction of the second air inlet and the second air outlet. The triangular plate 27 is an isosceles right triangle, with the right-angled sides of the triangular plate 27 connected to the adjacent edges of the second air inlet and the second air outlet. The triangular plate 27 forms a triangular reinforcement structure at the edges of the second air inlet and the second air outlet, thereby improving the structural stability and durability of the entire heating core 2.

[0042] A symmetrically arranged guide rail 11 is provided at the bottom of the installation cavity, and a roller 23 adapted to the guide rail 11 is provided at the bottom of the core housing. When the heating core 2 is movably connected to the housing 1, the roller 23 rolls on the guide rail 11. The guide rail 11 is used to guide the heating core 2 during installation and removal, preventing the heating core 2 from getting stuck during installation and removal. The rolling of the roller 23 on the guide rail 11 significantly reduces frictional resistance compared to traditional sliding contact. At the same time, the rolling contact between the roller 23 and the guide rail 11 reduces bumps and vibrations during movement, making the movement of the heating core 2 more stable and smooth, thereby improving the overall performance and stability of the device.

[0043] In this embodiment, the guide rail 11 is made of sheet metal and is in an inverted V shape. A V-shaped groove is provided on the circumference of the roller 23. The V-shaped groove is adapted to the guide rail 11, ensuring that when the roller 23 moves on the guide rail 11, the contact area is more concentrated and uniform; at the same time, the adaptation of the inverted V-shaped guide rail 11 and the V-shaped groove not only provides a stable guiding effect, but also can automatically adjust the position of the roller 23 during the movement so that it always remains on the optimal path, thereby improving the smoothness of the overall movement.

[0044] Based on the disclosure and teachings of the above description, those skilled in the art may also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and modifications and variations of the present invention should also fall within the scope of protection of the claims of the present invention. In addition, although certain specific terms are used in this description, these terms are for convenience only and do not constitute any limitation to the present invention.

Claims

1. A cast film electric heater with a detachable core, comprising a housing, wherein the interior of the housing is hollow to form an installation cavity, wherein a heating core is provided in the installation cavity, characterized in that: One side of the installation cavity is open to form an entrance and exit adapted to the heating core, the heating core passes through the entrance and exit from the outside to the inside, and is movably connected to the shell in a detachable manner; The heating core comprises a core shell, wherein a plurality of heating tubes arranged transversely and / or longitudinally are provided in the core shell, wherein the heating tubes are U-shaped, and both ends of the heating tubes are fixed to the core shell; The port of the heating pipe is provided on a side of the heating core corresponding to the inlet and outlet; a protective cover is provided on the heating core, and the protective cover completely covers the port of the heating pipe; a plurality of conductive plates connected to the heating pipes are provided inside the protective cover, and each conductive plate is connected to the same end of a different heating pipe; A symmetrically arranged guide rail is provided at the bottom of the installation cavity, and a roller adapted to the guide rail is provided at the bottom of the core shell. When the heating core is movably connected to the shell, the roller rolls on the guide rail; the guide rail is made of sheet metal and is in an inverted V shape. A V-shaped groove is provided on the circumference of the roller, and the V-shaped groove is adapted to the guide rail.

2. A cast film electric heater with a detachable core according to claim 1, characterized in that: The heating core further comprises a heat preservation unit corresponding to the heating pipe. The heat preservation unit is installed at the port of the heating pipe and is fixedly connected to the core shell.

3. The cast film electric heater with a detachable core according to claim 1, characterized in that: The shell and the core shell are open on the sides, so that a first air inlet and a second air inlet are formed on both sides of the shell, and a second air inlet and a second air outlet are formed on both sides of the core shell. When the cast film electric heater is working, the cold air flow flows through the first air inlet, the second air inlet, the heating tube, the second air outlet and the first air outlet in sequence to form a hot air flow.

4. The cast film electric heater with a detachable core according to claim 3, characterized in that: A plurality of reinforcing ribs are provided at the first air inlet and the first air outlet, and each of the reinforcing ribs simultaneously connects adjacent edges of the first air inlet and the first air outlet to form a triangular structure.

5. The cast film electric heater with a detachable core according to claim 3, characterized in that: A triangular plate is provided at the edge connection of the second air inlet and the second air outlet. The triangular plate is an isosceles right triangle, and the right-angled sides of the triangular plate are connected to the adjacent edges of the second air inlet and the second air outlet.

6. The cast film electric heater with a detachable core according to claim 1, characterized in that: The bottom of the protective cover is also provided with a plurality of wire holes, and the cables for supplying power to the heating tube enter the interior of the protective cover through the wire holes and are electrically connected to the conductive plate; the side, top and front of the protective cover are provided with a plurality of heat dissipation holes, and the heat dissipation holes connect the interior of the protective cover with the outside world.

7. The cast film electric heater with a detachable core according to claim 1, characterized in that: The protective cover includes a detachably connected protective door, and the protective door is arranged on a side of the protective cover opposite to the heating pipe port.

8. The cast film electric heater with a detachable core according to claim 1, characterized in that: The shell is also provided with a plurality of hanging rings, which are welded to the top of the shell.

9. The cast film electric heater with a detachable core according to claim 1, characterized in that: The conductive plate is made of copper.

10. The cast film electric heater with a detachable core according to claim 1, characterized in that: The heating pipe is connected to the core shell by bolts.

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