Cylindrical film heating device

Abstract

The utility model discloses a cylinder film heating device, which is characterized in that an air outlet end of a hot air module blows hot air into one end of a cylinder film passing hole of a heat preservation cylinder, an air inlet end of the hot air module sucks the other end of the cylinder film passing hole of the heat preservation cylinder, hot air flow can be formed in the cylinder film passing hole, and the residual hot air passing through the cylinder film passing hole flows; the hot air flow can enter the air inlet end of the hot air module, then is heated and utilized again by the air heater, and is fed into the barrel film through hole again through the fan to form circulating hot air flow to circularly heat the barrel film through hole; compared with a mode of heating all cold air into hot air by an air heater, the scheme can recycle the residual hot air passing through the holes of the barrel film, so that the heat utilization rate is improved, and more energy is saved and the environment is protected; the radiant heater is arranged on the heat preservation barrel and located on the hole wall of the barrel film passing hole, the radiant heater is matched with the hot air module to control the temperature in the heat preservation barrel, the total heat utilization efficiency is higher, heating is relatively rapid, and energy saving and environment protection are achieved.

Description

Technical Field

[0001] This utility model relates to a blown film machine, and in particular to a cylindrical film heating device. Background Technology

[0002] After a blown film machine blows molten plastic into a tubular film using a blown film head, the film sometimes needs to be reheated by a film heating device for secondary processing. Some existing film heating devices include an insulation cylinder and a hot air module. The insulation cylinder has vertically extending film passage holes through which the film can move. The hot air module slowly blows hot air into the lower end of the film passage holes, where it then rises naturally and exits the heating device from the upper end of the holes. These film heating devices have relatively low heat utilization rates and are not energy-efficient or environmentally friendly. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a cylindrical membrane heating device that can improve heat utilization efficiency and is more energy-saving and environmentally friendly.

[0004] According to an embodiment of the present invention, a membrane heating device includes an insulation cylinder and a hot air module. The insulation cylinder has a membrane passage hole, the axis of which is vertically oriented. The hot air module is disposed in the insulation cylinder and includes an air duct structure, a fan, and an air heater. The air outlet of the air duct structure is connected to one end of the membrane passage hole, and the air inlet of the air duct structure is connected to the other end of the membrane passage hole. The air heater is disposed in the air duct structure, and the fan is disposed in the air duct structure and is used to generate airflow from the air inlet to the air outlet within the air duct structure.

[0005] The cylindrical membrane heating device according to the embodiment of this utility model has at least the following beneficial effects: the outlet end of the hot air module blows hot air into one end of the cylindrical membrane through hole of the insulation cylinder, and the inlet end of the hot air module draws in the other end of the cylindrical membrane through hole of the insulation cylinder. A hot air flow can be formed inside the cylindrical membrane through hole. The remaining hot air after flowing through the cylindrical membrane through hole can enter the inlet end of the hot air module, and then be reheated and reused by the air heater. It is then sent back into the cylindrical membrane through hole by the fan to form a circulating hot air flow to circulate and heat the cylindrical membrane through hole. Compared with the method of heating all cold air into hot air by the air heater, this solution can circulate and reuse the remaining hot air in the cylindrical membrane through hole, thereby improving the heat utilization rate and being more energy-saving and environmentally friendly.

[0006] According to some embodiments of the present invention, a radiant heater is also included, which is disposed in the heat-insulating cylinder and located on the wall of the through hole of the cylinder membrane, and the radiant heater can radiate heat toward the through hole of the cylinder membrane.

[0007] According to some embodiments of the present invention, the air duct structure includes an air inlet pipe, a connecting pipe, and an air outlet pipe. The air inlet of the fan is connected to the upper end of the membrane through-hole through the air inlet pipe. The air outlet of the fan is connected to the air inlet of the air heater through the connecting pipe. The air outlet of the air heater is connected to the lower end of the membrane through-hole through the air outlet pipe.

[0008] According to some embodiments of the present invention, the air outlet pipe includes a main air outlet pipe section and at least two branch air outlet pipe sections. One end of each branch air outlet pipe section is connected to the lower end of the membrane through hole. All the branch air outlet pipe sections are evenly arranged around the axis of the membrane through hole at the end closest to the membrane through hole. The other end of each branch air outlet pipe section is connected to one end of the main air outlet pipe section. The other end of the main air outlet pipe section is connected to the air outlet of the air heater.

[0009] According to some embodiments of the present invention, the axis of the end of the air outlet branch pipe section near the membrane through hole is tangent to the circumferential direction of the membrane through hole.

[0010] According to some embodiments of the present invention, the air inlet pipe includes a main air inlet pipe section and at least two branch air inlet pipe sections. One end of each branch air inlet pipe section is connected to the upper end of the membrane through hole. All the branch air inlet pipe sections are evenly arranged around the axis of the membrane through hole at the end closest to the membrane through hole. The other end of each branch air inlet pipe section is connected to one end of the main air inlet pipe section. The other end of the main air inlet pipe section is connected to the air inlet of the fan.

[0011] According to some embodiments of the present invention, the axis of the end of the air inlet branch pipe section near the membrane through hole is tangent to the circumferential direction of the membrane through hole.

[0012] According to some embodiments of the present invention, the radiant heater is provided with at least two rows that are evenly arranged around the hole axis of the cylindrical membrane through hole, and each row of the radiant heater includes at least two radiant heaters that are evenly arranged along the hole axis of the cylindrical membrane through hole.

[0013] According to some embodiments of the present invention, two adjacent radiant heaters are spaced apart.

[0014] According to some embodiments of the present invention, the heat-insulating cylinder is cylindrical, and the membrane through hole is a circular through hole; the radiant heater is a radiant heating element, which is attached to the wall of the membrane through hole.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0017] Figure 1 This is a perspective view of the cylindrical membrane heating device according to an embodiment of the present utility model;

[0018] Figure 2 This is a top view schematic diagram of the cylindrical membrane heating device according to an embodiment of the present utility model;

[0019] Figure 3 This is an embodiment of the present utility model. Figure 2 A cross-sectional view of part of the structure along the AA direction.

[0020] Figure label:

[0021] Insulation cylinder 100, membrane through hole 110;

[0022] Hot air module 200, air duct structure 210, air inlet pipe 211, main air inlet pipe section 2111, air inlet branch pipe section 2112, connecting pipe 212, air outlet pipe 213, main air outlet pipe section 2131, air outlet branch pipe section 2132, fan 220, air heater 230.

[0023] Radiant heater 300. Detailed Implementation

[0024] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0025] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0027] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0028] Reference Figures 1 to 3 The membrane heating device according to an embodiment of the present invention includes an insulation cylinder 100 and a hot air module 200. The insulation cylinder 100 is provided with a membrane passage hole 110, the axis of which is arranged vertically. The hot air module 200 is disposed in the insulation cylinder 100 and includes an air duct structure 210, a fan 220, and an air heater 230. The air outlet end of the air duct structure 210 is connected to the lower end of the membrane passage hole 110, and the air inlet end of the air duct structure 210 is connected to the upper end of the membrane passage hole 110. The air heater 230 is disposed in the air duct structure 210, and the fan 220 is disposed in the air duct structure 210 and is used to form an airflow from the air inlet end to the air outlet end within the air duct structure 210.

[0029] The hot air module 200 blows hot air into one end of the membrane passage 110 of the insulation cylinder 100 from its outlet end, and the hot air module 200 draws in the other end of the membrane passage 110 from its inlet end. A hot airflow can be formed inside the membrane passage 110. The remaining hot air after flowing through the membrane passage 110 can enter the inlet end of the hot air module 200, and is then reheated and reused by the air heater 230. It is then sent back into the membrane passage 110 by the fan 220, forming a circulating hot airflow to circulate and heat the membrane passage 110. Compared with the method of the air heater 230 heating all the cold air into hot air, this solution can circulate and reuse the remaining hot air in the membrane passage 110, thereby improving the heat utilization rate and making it more energy-saving and environmentally friendly.

[0030] In this embodiment, a radiant heater 300 is also included. The radiant heater 300 is disposed in the insulation cylinder 100 and located on the wall of the membrane passage hole 110. The radiant heater 300 can radiate heat toward the membrane passage hole 110. By providing the radiant heater 300, when the temperature inside the membrane passage hole 110 needs to be increased, the radiant heater 300 can directly heat and raise the temperature inside the membrane passage hole 110, thereby increasing the heating rate of the membrane heating device. The radiant heater 300, in conjunction with the hot air module 200, controls the temperature inside the insulation cylinder 100, resulting in higher overall heat utilization efficiency, relatively faster heating, and energy saving and environmental protection.

[0031] In this embodiment, the air duct structure 210 includes an air inlet pipe 211, a connecting pipe 212, and an air outlet pipe 213. The air inlet of the fan 220 is connected to the upper end of the membrane passage hole 110 through the air inlet pipe 211, and the air outlet of the fan 220 is connected to the air inlet of the air heater 230 through the connecting pipe 212. The air outlet of the air heater 230 is connected to the lower end of the membrane passage hole 110 through the air outlet pipe 213. The air at the upper end of the insulation cylinder 100 first enters the fan 220 through the air inlet pipe 211, and then enters the air heater 230 through the connecting pipe 212. Subsequently, the hot air is blown into the insulation cylinder 100 through the air outlet pipe 213 to achieve circulating hot air heating. The air entering the air duct structure 210 from the insulation cylinder 100 first passes through the fan 220 and then through the air heater 230 for reheating, thereby reducing the risk of the fan 220 overheating. In this case, the hot air flows upward through the orifice 110 of the membrane, utilizing the lift of the hot air. Alternatively, the membrane can move upward, causing the hot air to flow in the same direction as the membrane; or it can move downward, causing the hot air to flow in opposite directions, resulting in higher heat exchange efficiency.

[0032] In other embodiments, the outlet end of the hot air module 200 may be connected to the upper end of the membrane through-hole 110, and the inlet end of the hot air module 200 may be connected to the lower end of the membrane through-hole 110, so that the hot air flow in the membrane through-hole 110 flows from top to bottom. In this case, the movement direction of the membrane can be moved from bottom to top, so that the hot air flow and the membrane flow in opposite directions, resulting in higher heat exchange efficiency; or the movement direction of the membrane can be moved from top to bottom, so that the hot air flow and the membrane flow in the same direction.

[0033] In this embodiment, the air outlet duct 213 includes a main air outlet section 2131 and three branch air outlet sections 2132. One end of each branch air outlet section 2132 is connected to the lower end of the membrane passage hole 110. All branch air outlet sections 2132 are evenly arranged around the axis of the membrane passage hole 110 near the end of the branch air outlet section 2132. The other end of each branch air outlet section 2132 is connected to one end of the main air outlet section 2131, and the other end of the main air outlet section 2131 is connected to the air outlet of the air heater 230. This allows air to enter the membrane passage hole 110 from multiple locations, which helps maintain a similar temperature around the circumference of the membrane passage hole 110. The hot air blown out by the air heater 230 passes through the main air outlet section 2131 and then the hot air from the three branch air outlet sections 2132 enters the insulation cylinder 100 respectively. The structure is relatively simple and does not require multiple air heaters 230, which helps to save manufacturing costs.

[0034] In this embodiment, the axis of the end of the air outlet branch pipe section 2132 near the membrane through hole 110 is tangent to the circumference of the membrane through hole 110. The airflow direction remains essentially tangent to the wall of the membrane through hole 110, which reduces the risk of hot air directly blowing onto the membrane and improves the quality of the film produced by the blown film machine.

[0035] It is conceivable that in other embodiments, the air outlet duct 213 may also be provided with two, four or more air outlet branch duct sections 2132, which can be specifically selected according to the specific needs of those skilled in the art.

[0036] In this embodiment, the air inlet duct 211 includes a main air inlet section 2111 and three branch air inlet sections 2112. One end of each branch air inlet section 2112 is connected to the upper end of the membrane through-hole 110. All branch air inlet sections 2112 are evenly arranged around the axis of the membrane through-hole 110 near one end. The other end of each branch air inlet section 2112 is connected to one end of the main air inlet section 2111, and the other end of the main air inlet section 2111 is connected to the air inlet of the fan 220. This design facilitates the duct structure 210 to draw air from all circumference of the membrane through-hole 110, resulting in a high rate of reuse of residual hot air. Air from the upper end of the diaphragm tube through the hole 110 enters three air inlet branch pipe sections 2112 respectively. Then, the air from the three air inlet branch pipe sections 2112 converges into the main air inlet pipe section 2111, and then enters the fan 220. One fan 220 can achieve air suction from all circumference of the diaphragm tube through the hole 110. The structure is simple and saves manufacturing costs.

[0037] In this embodiment, the axis of the end of the air inlet branch pipe section 2112 near the membrane through hole 110 is tangent to the circumferential direction of the membrane through hole 110, which helps to reduce the interference of airflow on the membrane and improve the quality of the film produced by the blown film machine.

[0038] It is conceivable that in other embodiments, the air inlet duct 211 may also be provided with two, four or more air inlet branch duct sections 2112, which can be selected by those skilled in the art according to actual needs.

[0039] In this embodiment, the radiant heaters 300 are arranged in at least two rows, uniformly arranged around the axis of the membrane passage 110. Each row of radiant heaters 300 includes at least two radiant heaters 300 uniformly arranged along the axis of the membrane passage 110. The radiant heaters 300 are arranged in a ring array, which is beneficial for all parts of the membrane passage 110 to be radiated and heated by the nearby radiant heaters 300, so that the temperature in the membrane passage 110 can be relatively uniform, thereby improving the heating stability of the membrane.

[0040] Specifically, the radiant heater 300 can be arranged in two, three, four or more rows, and those skilled in the art can choose according to actual needs; each row of radiant heater 300 can include two, three, four or more radiant heaters 300, and those skilled in the art can choose according to actual needs.

[0041] In this embodiment, two adjacent radiant heaters 300 are spaced apart to facilitate the installation layout between different radiant heaters 300 and to facilitate local temperature control of the membrane through the hole 110, thus avoiding the risk of local overheating.

[0042] Specifically, the spacing between two adjacent radiant heaters 300 can be selected by those skilled in the art according to actual needs.

[0043] In this embodiment, the heat-insulating cylinder 100 is cylindrical, and the membrane through hole 110 is a circular through hole, which can be adapted to the cylindrical membrane blown out by a conventional blown film machine die head, and the effect is better.

[0044] In this embodiment, the radiant heater 300 is a radiant heating element, which is attached to the wall of the membrane passage 110. By using a radiant heating element, it can be attached to the wall of the membrane passage 110, minimizing the impact on the diameter of the membrane passage 110. This allows larger membranes to pass through the membrane passage 110, improving the applicability of the membrane heating device.

[0045] Specifically, the radiant heating element is a sheet-shaped electric heater that heats the inside of the cylindrical membrane through the hole 110 by radiating infrared rays.

[0046] It is conceivable that in other embodiments, the radiant heater 300 may also be a heater of other shapes or types, which may be specifically selected by those skilled in the art according to actual needs.

[0047] Specifically, when the membrane heating device is working, the membrane passes vertically through the membrane passage 110. Air from the upper end of the membrane passage 110 enters three inlet branch pipe sections 2112, then converges into the main inlet pipe section 2111 and enters the inlet of the fan 220. The outlet of the fan 220 blows the airflow into the inlet of the air heater 230 through the connecting pipe 212. The air heater 230 heats the passing airflow, and then the hot air flows through the outlet of the air heater 230 to the main outlet pipe section 2131, then splits into three outlet branch pipe sections 2132, and then enters the lower end of the membrane passage 110. The hot air then rises along the membrane passage 110, forming a circulating air heating system. During this period, the radiant heater 300 can be activated to directly heat the area inside the membrane passage 110.

[0048] Specifically, the air inlet at the lower end of the insulation cylinder 100 is set upwards to facilitate the rise of hot air entering the membrane through the hole 110; the air outlet at the upper end of the insulation cylinder 100 is tangent to the inner wall of the membrane through the hole 110, which facilitates the relatively uniform extraction of air near the hole wall and improves the utilization of residual hot air.

[0049] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0050] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A cylindrical membrane heating device, characterized in that, include: The heat-insulating cylinder (100) is provided with a membrane passage hole (110), and the axis of the membrane passage hole (110) is arranged vertically; A hot air module (200) is disposed in the insulation cylinder (100). The hot air module (200) includes a duct structure (210), a fan (220), and an air heater (230). The air outlet of the duct structure (210) is connected to one end of the membrane through hole (110), and the air inlet of the duct structure (210) is connected to the other end of the membrane through hole (110). The air heater (230) is disposed in the duct structure (210), and the fan (220) is disposed in the duct structure (210) and is used to form an airflow from the air inlet to the air outlet within the duct structure (210).

2. The cylindrical membrane heating device according to claim 1, characterized in that: It also includes a radiant heater (300), which is disposed in the heat-insulating cylinder (100) and located on the wall of the cylinder membrane through hole (110), and the radiant heater (300) can radiate heat toward the cylinder membrane through hole (110).

3. The cylindrical membrane heating device according to claim 1, characterized in that: The air duct structure (210) includes an air inlet pipe (211), a connecting pipe (212), and an air outlet pipe (213). The air inlet of the fan (220) is connected to the upper end of the membrane through hole (110) through the air inlet pipe (211). The air outlet of the fan (220) is connected to the air inlet of the air heater (230) through the connecting pipe (212). The air outlet of the air heater (230) is connected to the lower end of the membrane through hole (110) through the air outlet pipe (213).

4. The cylindrical membrane heating device according to claim 3, characterized in that: The air outlet pipe (213) includes a main air outlet pipe section (2131) and at least two branch air outlet pipe sections (2132). One end of each branch air outlet pipe section (2132) is connected to the lower end of the membrane passage hole (110). All the branch air outlet pipe sections (2132) are evenly arranged around the axis of the membrane passage hole (110) near the end of the branch air outlet pipe section (2132). The other end of each branch air outlet pipe section (2132) is connected to one end of the main air outlet pipe section (2131). The other end of the main air outlet pipe section (2131) is connected to the air outlet of the air heater (230).

5. The cylindrical membrane heating device according to claim 4, characterized in that: The axis of the end of the air outlet branch pipe section (2132) near the membrane passage hole (110) is tangent to the circumferential direction of the membrane passage hole (110).

6. The cylindrical membrane heating device according to claim 3, characterized in that: The air inlet pipe (211) includes an air inlet main pipe section (2111) and at least two air inlet branch pipe sections (2112). One end of the air inlet branch pipe section (2112) is connected to the upper end of the membrane passage hole (110). All the air inlet branch pipe sections (2112) are evenly arranged around the hole axis of the membrane passage hole (110) near the end of the membrane passage hole (110). The other end of all the air inlet branch pipe sections (2112) is connected to one end of the air inlet main pipe section (2111). The other end of the air inlet main pipe section (2111) is connected to the air inlet of the fan (220).

7. The cylindrical membrane heating device according to claim 6, characterized in that: The axis of the end of the air inlet branch pipe section (2112) near the membrane passage hole (110) is tangent to the circumferential direction of the membrane passage hole (110).

8. The cylindrical membrane heating device according to claim 2, characterized in that: The radiation heater (300) is provided with at least two rows of holes evenly arranged around the hole axis of the membrane through hole (110), and each row of radiation heaters (300) includes at least two radiation heaters (300) evenly arranged along the hole axis of the membrane through hole (110).

9. The cylindrical membrane heating device according to claim 8, characterized in that: The two adjacent radiant heaters (300) are spaced apart.

10. The cylindrical membrane heating device according to claim 2, characterized in that: The heat-insulating cylinder (100) is cylindrical, and the membrane through hole (110) is a circular through hole; the radiant heater (300) is a radiant heating element, which is attached to the wall of the membrane through hole (110).

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