Electromagnetic heating jacketed dryer

Abstract

The utility model discloses electromagnetic heating jacket drying cylinder, including with paper surface contact's cylinder body and coaxially fixed installation in the inside of cylinder body's jacket, the inner wall of cylinder body and the outer wall of jacket form annular oil chamber for accommodating heat conducting oil, the inside installation of jacket is annularly arranged heating coil, heating coil is fixed in the inner wall of jacket through a plurality of groups fixed blocks, and the outer wall of heating coil is close to the inner wall of jacket, the inside wall of cylinder body is installed with helical baffle, helical baffle is used for promoting the heat conducting oil in annular oil chamber to form turbulent flow in the flowing process. Through built -in electromagnetic coil direct heating jacket, and through heat conducting oil, heat is high -efficient, evenly transmitted to cylinder, replaces traditional cumbersome external steam boiler system, not only simplifies equipment structure, reduces the floor area, more significantly improves heat conduction efficiency and temperature response speed, thereby effectively guarantees the stability of product quality.

Description

Technical Field

[0001] This utility model relates to the field of drying cylinder technology, specifically to an electromagnetically heated jacketed drying cylinder. Background Technology

[0002] The original paper drying cylinder was a sealed container made of cast iron or welded steel plates, filled with saturated steam to maintain a uniform temperature around the outer circumference of the cylinder. It was a pressure vessel used to dry the pulp on a blanket passing over the cylinder surface and to wind the paper. The saturated steam was generated by a steam boiler and introduced into the drying cylinder through pipes and connectors.

[0003] Traditional drying cylinders require an external steam boiler, which not only results in a complex system structure and large footprint, but also suffers from low thermal conductivity and slow temperature response due to the steam heating method, making it difficult to quickly and accurately adjust the surface temperature of the drying cylinder, thus affecting the stability of product quality. Therefore, an electromagnetically heated jacketed drying cylinder is needed. Utility Model Content

[0004] The purpose of this invention is to provide an electromagnetic heating jacket drying cylinder, which directly heats the jacket through an electromagnetic heating coil and uses a spiral guide plate to promote turbulence in the heat transfer oil to enhance heat exchange, thereby solving the technical problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] An electromagnetic heating jacketed drying cylinder includes a cylinder body that contacts the surface of paper, and a jacket that is coaxially fixed inside the cylinder body. An annular oil cavity for containing heat transfer oil is formed between the inner wall of the cylinder body and the outer wall of the jacket.

[0007] The jacket is equipped with a ring-shaped heating coil. The heating coil is fixed to the inner wall of the jacket by several sets of fixing blocks, and the outer wall of the heating coil is in close contact with the inner wall of the jacket.

[0008] The inner wall of the cylinder is equipped with a spiral guide plate, which is used to cause the heat transfer oil in the annular oil cavity to form turbulence during the flow process.

[0009] Preferably, cylinder heads are symmetrically installed on both sides of the cylinder body, and a spindle connected to an external drive device is installed on the outer side wall of the two sets of cylinder heads.

[0010] Preferably, a cavity is provided in the middle of the main shaft, and a connecting pipe for conveying heat transfer oil is installed in the middle of the cavity.

[0011] Preferably, the input end of the connecting pipe extends through to the outside of the main shaft, and the input end of the connecting pipe located outside the main shaft is connected to an external oil supply device through a rotary joint.

[0012] Preferably, the inner wall of the jacket is provided with several sets of oil delivery joints, and the output end of the connecting pipe is connected to the corresponding oil delivery joint through several sets of high-temperature resistant pipes.

[0013] Preferably, the surface of the spiral guide plate is coated with a high-temperature resistant anti-stick coating, which is used to prevent the adhesion of heat transfer oil oxide scale.

[0014] Preferably, the outer wall of the spiral guide plate is integrally formed with several sets of protrusions, and the several sets of protrusions are distributed equidistantly along the central axis of the spiral guide plate in a spiral pattern.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] By directly heating the jacket with a built-in electromagnetic coil and efficiently and evenly transferring heat to the cylinder through heat transfer oil, it replaces the traditional bulky external steam boiler system. This not only simplifies the equipment structure and reduces the floor space, but also significantly improves the heat transfer efficiency and temperature response speed. It can achieve rapid and precise control of the surface temperature of the drying cylinder, thereby effectively ensuring the stability of product quality. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the internal structure of the cylinder body of this utility model;

[0019] Figure 3 This is a schematic diagram of the internal structure of the jacket of this utility model;

[0020] Figure 4 This is a schematic diagram of the internal structure of the cavity in this utility model.

[0021] In the diagram: 1. Cylinder block; 2. Jacket; 3. Annular oil chamber; 4. Heating coil; 5. Spiral guide plate; 6. Cylinder head; 7. Main shaft; 8. Cavity; 9. Connecting pipe; 10. Rotary joint; 11. Oil delivery joint; 12. High-temperature resistant pipe; 13. Protrusion. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] This utility model provides: an electromagnetically heated jacketed drying cylinder, such as... Figures 1-4As shown, the device includes a cylinder 1 that contacts the paper surface, and a jacket 2 coaxially fixed inside the cylinder 1. An annular oil cavity 3 for accommodating heat-conducting oil is formed between the inner wall of the cylinder 1 and the outer wall of the jacket 2. The cylinder 1 is used for direct contact with the paper surface, undertaking the functions of heat transfer and paper drying. Its outer wall needs to maintain a uniform temperature to ensure drying quality. The jacket 2, coaxially fixed inside the cylinder 1, provides a stable mounting carrier for the heating coil 4 and, together with the inner wall of the cylinder 1, forms the annular oil cavity 3, providing space for the heat-conducting oil.

[0024] A ring-shaped heating coil 4 is installed inside the jacket 2. The heating coil 4 is fixed to the inner wall of the jacket 2 by several sets of fixing blocks, and the outer wall of the heating coil 4 is in close contact with the inner wall of the jacket 2. The ring-shaped heating coil 4 is fixed to the inner wall of the jacket 2 and the outer wall is in close contact. When energized, the jacket 2 can quickly generate heat, replacing the traditional steam heating heat source supply method. It can quickly transfer heat to the outer wall of the cylinder 1, ensuring the heating efficiency of the drying cylinder.

[0025] Heating coil 4 can be selected with a single-group power of 0-200kW, an operating frequency of 5-20kHz, and an outer diameter of ≥100mm. 2 Electromagnetic heating wire (high temperature resistance > 500℃, voltage resistance > 500V), a toroidal heating coil with 80-120 turns. Single-unit power of 0-200kW combined with a 5-20kHz intermediate frequency operating frequency enables rapid generation of an alternating magnetic field, resulting in efficient induction heating of the jacket 2; outer diameter ≥ 100mm. 2 The electromagnetic heating wire combines excellent conductivity and structural strength. The 80-120 turn annular design is adapted to the internal installation space of the jacket 2. It can be stably fixed by the fixing block and closely attached to the inner wall of the jacket 2 to ensure efficient heat transfer. The high temperature resistant material of ≥200℃ can withstand the high temperature of heat conduction by the heat-conducting oil in the annular oil cavity 3, avoiding insulation aging after long-term use.

[0026] A spiral guide plate 5 is installed on the inner wall of the cylinder 1. The spiral guide plate 5 is used to induce turbulence in the heat transfer oil within the annular oil cavity 3 during flow. The heating coil 4 generates heat and quickly transfers it to the jacket 2. The jacket 2 then conducts the heat to the heat transfer oil within the annular oil cavity 3. Guided by the spiral guide plate 5, the heat transfer oil no longer flows in a straight line but forms strong spiral turbulence, breaking the limitations of laminar heat transfer and allowing for more thorough contact between the heat transfer oil and the inner wall of the cylinder 1 and the outer wall of the jacket 2, significantly improving heat transfer efficiency. This combination not only eliminates the need for an external steam boiler, simplifying the equipment structure and reducing the footprint, but also enables rapid adjustment of the surface temperature of the cylinder 1 through the rapid response characteristics of electromagnetic heating, solving the problems of low heat transfer efficiency and slow temperature response in traditional drying cylinders, and ensuring product quality stability.

[0027] Preferably, cylinder covers 6 are symmetrically installed on both sides of the cylinder body 1, and main shafts 7 connected to external drive equipment are installed on the outer walls of the two sets of cylinder covers 6. The cylinder covers 6 seal both ends of the cylinder body 1 to prevent leakage of heat transfer oil in the annular oil chamber 3, and at the same time protect internal components such as heating coils 4 and spiral guide plates 5 from external contamination and damage. The main shafts 7 are coaxially arranged with the cylinder body 1 and are used to connect the external drive equipment to the cylinder body 1. During operation, the external drive equipment outputs rotational power, which is transmitted to the cylinder covers 6 through the main shafts 7, thereby driving the cylinder body 1 to rotate synchronously. This allows the paper to be evenly adhered to the outer wall of the cylinder body 1 for continuous drying, thus achieving stable rotation of the cylinder body 1 and ensuring that the paper can be dried continuously and evenly.

[0028] Furthermore, a cavity 8 is provided in the middle of the main shaft 7, and a connecting pipe 9 for conveying heat transfer oil is installed in the middle of the cavity 8. The cavity 8, located in the middle of the main shaft 7, provides installation space for the connecting pipe 9 and prevents interference between the connecting pipe 9 and the rotational movement of the main shaft 7. The connecting pipe 9 is the core conveying pipe for heat transfer oil entering and exiting the annular oil chamber 3, responsible for introducing heat transfer oil from external oil supply equipment into the oil chamber and simultaneously circulating the heat-exchanged heat transfer oil. The connecting pipe 9 is fixedly installed in the cavity 8 and does not rotate with the rotation of the main shaft 7. When the main shaft 7 rotates, the cavity 8 provides independent clearance space for the connecting pipe 9, preventing the connecting pipe 9 from being entangled or damaged due to the rotation of the main shaft. During operation, the heat transfer oil is stably delivered to the annular oil chamber 3 through the connecting pipe 9 without interrupting the oil supply due to the rotation of the main shaft, ensuring the continuity of the heating process and further improving the stability of temperature control.

[0029] Furthermore, the input end of the connecting pipe 9 extends through to the outside of the main shaft 7, and the input end of the connecting pipe 9 located outside the main shaft 7 is connected to an external oil supply device via a rotary joint 10. The rotation axis of the rotary joint 10 coincides with the axis of the main shaft 7, one end of which is connected to a fixed external oil supply device pipeline, and the other end is fixed to the input end of the connecting pipe 9, which rotates synchronously with the main shaft 7. During operation, when the main shaft 7 drives the input end of the connecting pipe 9 to rotate, the internal sealing structure of the rotary joint 10 can maintain a dynamic seal, allowing the rotational movement of the connecting pipe 9 while preventing leakage of heat transfer oil during transportation. This ensures the continuity and sealing of the heat transfer oil circulation, allowing for the replenishment or replacement of heat transfer oil without interrupting the drying operation, while avoiding energy waste and equipment contamination caused by heat transfer oil leakage, further improving the practicality and safety of the equipment.

[0030] It is worth noting that several sets of oil delivery joints 11 are installed through the inner wall of the jacket 2. The output end of the connecting pipe 9 is connected to the corresponding oil delivery joint 11 through several sets of high-temperature resistant pipes 12. The number of oil delivery joints 11 corresponds one-to-one with the number of high-temperature resistant pipes 12, ensuring that the heat transfer oil can be evenly distributed into the oil chamber. The high-temperature resistant pipes 12 are made of stainless steel and have good high-temperature resistance and corrosion resistance. They are connected between the output end of the connecting pipe 9 and the oil delivery joints 11, serving as the channel for the heat transfer oil to enter the annular oil chamber 3 from the connecting pipe 9. During operation, the high-temperature resistant pipes 12 can adapt to the high-temperature conditions of the heat transfer oil, avoiding leakage caused by high-temperature aging after long-term use. The through-flow design of the oil delivery joints 11 ensures that the heat transfer oil flows smoothly into the oil chamber without the risk of stagnation or blockage.

[0031] Specifically, the surface of the spiral guide plate 5 is coated with a high-temperature resistant anti-stick coating to prevent the adhesion of scale from the heat transfer oil. The anti-stick coating is uniformly applied to the surface of the spiral guide plate 5, and its core function is to prevent scale formed by the oxidation of the heat transfer oil under high-temperature conditions from adhering to the surface of the guide plate. During operation, the heat transfer oil flows at high speed and forms turbulence on the surface of the spiral guide plate 5. At high temperatures, it is prone to oxidation and scale formation. However, the anti-stick coating has extremely low surface tension, making it difficult for scale to adhere. Even if a small amount remains, it can be washed away by the oil flow, ensuring the long-term stability of the heat transfer oil's flow state. This also reduces the frequency and difficulty of equipment cleaning and maintenance, lowering maintenance costs.

[0032] More specifically, the outer wall of the spiral guide plate 5 is integrally formed with several sets of protrusions 13, which are equidistantly distributed along the central axis of the spiral guide plate 5 in a spiral pattern. The protrusions 13 are integrally formed on the outer wall of the spiral guide plate 5 and are auxiliary structures that enhance the turbulence effect of the heat transfer oil. During operation, the spiral guide plate 5 drives the heat transfer oil to flow along the spiral trajectory, forming basic turbulence. The protrusions 13 tear the boundary layer of the heat transfer oil, breaking up any possible laminar flow zones and promoting the generation of finer vortices in the oil flow. This makes the heat mixing inside the heat transfer oil more uniform, further improving the heat exchange efficiency of the heat transfer oil and reducing the temperature difference of the heat transfer oil in different areas of the annular oil cavity 3, thereby ensuring the temperature uniformity of the cylinder block 1 surface.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art 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 appended claims and their equivalents.

Claims

1. An electromagnetically heated jacketed drying cylinder, characterized in that: It includes a cylinder (1) that contacts the paper surface, and a jacket (2) that is coaxially fixed inside the cylinder (1). An annular oil cavity (3) for containing heat transfer oil is formed between the inner wall of the cylinder (1) and the outer wall of the jacket (2). The jacket (2) is equipped with a ring-shaped heating coil (4). The heating coil (4) is fixed to the inner wall of the jacket (2) by several sets of fixing blocks, and the outer wall of the heating coil (4) is in close contact with the inner wall of the jacket (2). The inner wall of the cylinder (1) is equipped with a spiral guide plate (5), which is used to cause the heat transfer oil in the annular oil cavity (3) to form turbulence during the flow process.

2. The electromagnetic heating jacketed drying cylinder according to claim 1, characterized in that: Cylinder heads (6) are symmetrically installed on both sides of the cylinder body (1), and a main shaft (7) connected to an external drive device is installed on the outer side wall of the two sets of cylinder heads (6).

3. The electromagnetic heating jacketed drying cylinder according to claim 2, characterized in that: A cavity (8) is provided in the middle of the main shaft (7), and a connecting pipe (9) for conveying heat transfer oil is installed in the middle of the cavity (8).

4. The electromagnetic heating jacketed drying cylinder according to claim 3, characterized in that: The input end of the connecting pipe (9) extends through to the outside of the main shaft (7), and the input end of the connecting pipe (9) located outside the main shaft (7) is connected to the external oil supply equipment through a rotary joint (10).

5. The electromagnetic heating jacketed drying cylinder according to claim 1, characterized in that: The inner wall of the jacket (2) is equipped with several sets of oil delivery joints (11), and the output end of the connecting pipe (9) is connected to the corresponding oil delivery joint (11) through several sets of high temperature resistant pipes (12).

6. The electromagnetic heating jacketed drying cylinder according to claim 1, characterized in that: The surface of the spiral guide plate (5) is coated with a high-temperature resistant anti-stick coating, which is used to prevent the adhesion of heat transfer oil oxide scale.

7. The electromagnetic heating jacketed drying cylinder according to claim 6, characterized in that: The outer wall of the spiral guide plate (5) is integrally formed with several sets of protrusions (13), and the several sets of protrusions (13) are distributed at equal intervals along the central axis of the spiral guide plate (5).

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