An external circulation cooling system for a twin-screw extruder

Abstract

The utility model provides a kind of outer circulation cooling system of double screw extruder, including the jacket being arranged on screw extruder;Cooling tower, its input port is connected with water source, output port is connected the input end of the jacket by pipeline;The output end of the jacket is connected to the input port of the cooling tower by pipeline;Filtering pipe and cooling pump are arranged between the jacket and the output port of cooling tower;Cation exchange column is equipped in the filtering pipe;The cooling tower includes tower body, the cavity is defined to the tower body, the cavity top is connected with vacuum pump, the vacuum pump is configured to reduce the air pressure in cavity to below air pressure, improve heat dissipation efficiency;Realize cooling efficiency optimization and production cost reduction.

Description

Technical Field

[0001] This invention relates to the field of twin-screw extruder accessories technology, specifically to an external circulation cooling system for a twin-screw extruder. Background Technology

[0002] In order to accurately control the temperature of the material inside the screw and barrel during the operation of a twin-screw extruder production line, twin-screw extruder manufacturers usually equip the equipment with an internal cooling circulation system, including a water tank and a jacket, which is connected to a heat exchanger to achieve temperature control of the screw extruder.

[0003] However, in actual production, the internal circulation cooling system provided by the manufacturer has the following technical problems. The water tank capacity set by the manufacturer is relatively small, making it difficult to meet the cooling requirements under continuous high load operation, which to some extent restricts the processing efficiency of the twin-screw extruder; at the same time, in order to keep the cooling pipeline unobstructed and reduce the deposition of compounds such as calcium and magnesium in the cooling pipeline, this type of internal circulation cooling system must use deionized water, which results in a cost burden. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide an external circulation cooling system for a twin-screw extruder.

[0005] To achieve the above objectives, the technical solution provided by the present invention is as follows: An external circulation cooling system for a twin-screw extruder includes a jacket mounted on the screw extruder. The input end of the jacket is connected to the output port of a cooling tower via a pipeline, and the output end of the jacket is connected to the input port of the cooling tower via a pipeline. The cooling tower is used to cool the flowing water in the jacket. A filter pipe and a cooling pump are arranged between the jacket and the output port of the cooling tower. A cation exchange column is arranged inside the filter pipe. The cooling tower includes a tower body configured as a cavity. The input port of the cooling tower is also connected to a water source. A vacuum pump is connected to the top of the cavity, and the vacuum pump makes the air pressure inside the cavity of the cooling tower lower than the air pressure.

[0006] As a preferred technical solution, the top of the cooling tower is connected to the vacuum pump through an exhaust port, and the exhaust port is equipped with a one-way valve, which directs the gas flow direction in the cavity from the cavity to the vacuum pump.

[0007] As a preferred technical solution, the end of the filter tube is connected to the pipeline via a flange.

[0008] As a preferred technical solution, the flange is fastened by a ring bolt, wherein the ring bolt has an annular part extending from the bolt head.

[0009] As a preferred technical solution, the inner sidewall of the filter tube is provided with a slider along the axial direction, the sidewall of the cation exchange column is provided with a through groove adapted to the slider, the length of the cation exchange column is less than that of the filter tube, and a limiting ring is provided at the end of the filter tube, the inner diameter of the limiting ring being less than the outer diameter of the cation exchange column.

[0010] As a preferred technical solution, the limiting ring is provided with a limiting block adapted to the slider, the limiting ring is provided with an outer edge, the outer edge extends to the end face of the filter tube, and when the pipeline is connected to the filter tube, the outer edge is clamped between the two flanges.

[0011] As a preferred technical solution, the limiting ring is also fitted with a sealing ring inside the filter tube.

[0012] As a preferred technical solution, the filter tube is also provided with a circulating filter branch pipe in parallel, and the output ends of the filter tube and the circulating filter branch pipe are connected to the pipeline through a proportional valve.

[0013] The advantages and beneficial effects of this invention are as follows: the combination of an external cooling tower and a vacuum pump solves the bottleneck of cooling efficiency caused by insufficient water tank capacity in the internal circulation system, and utilizes the vacuum low-pressure environment to lower the boiling point of water, promote water evaporation in the cooling tower, and improve the heat exchange efficiency of the cooling tower; through the filter tube structure of the integrated cation exchange column, the water quality is directly softened in the circulating water treatment process, eliminating the mandatory use of deionized water and significantly reducing long-term operating costs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a partial disassembly diagram of the filter tube of this utility model; Figure label: 1-Jacket, 2-Cooling tower, 3-Filter pipe, 4-Cooling pump, 5-Cation exchange column, 6-Vacuum pump, 7-One-way valve, 8-Flange, 9-Ring bolt, 10-Slider, 11-Through groove, 12-Limiting ring, 13-Limiting block, 14-Outer edge, 15-Sealing ring, 16-Circulating filter branch pipe, 17-Proportional valve. Detailed Implementation

[0015] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0016] The terms “comprising” and “having”, and any variations thereof, used in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0017] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly or implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0018] Please see Figures 1-2 This embodiment provides an external circulation cooling system for a twin-screw extruder, including a jacket 1 mounted on the screw extruder; a cooling tower 2, whose inlet is connected to a water source and whose outlet is connected to the inlet of the jacket 1 via a pipeline; the outlet of the jacket 1 is connected to the inlet of the cooling tower 2 via a pipeline; a filter pipe 3 and a cooling pump 4 are disposed between the outlet of the jacket 1 and the cooling tower 2; a cation exchange column 5 is provided inside the filter pipe 3; the cooling tower 2 includes a tower body defining a cavity, the top of which is connected to a vacuum pump 6, which is configured to reduce the air pressure inside the cavity to below air pressure. Cooling water is output from the cooling tower 2, propelled by the cooling pump 4 through the filter pipe 3 into the jacket 1 to cool the screw, and the returned water returns to the cooling tower 2 for further cooling; the vacuum pump 6 reduces the air pressure inside the tower, causing the water to evaporate at low temperatures, enhancing heat dissipation; the cation exchange column 5 adsorbs calcium and magnesium ions in the water, preventing scaling, significantly improving cooling efficiency and reducing water quality requirements.

[0019] To ensure unidirectional air extraction by the vacuum pump and prevent gas backflow, the technical solution provided in this embodiment is as follows: the top of the cooling tower 2 is connected to the vacuum pump 6 through an exhaust port. The exhaust port is equipped with a one-way valve 7, which is configured to allow gas to flow only from the cavity to the vacuum pump 6. When the vacuum pump 6 is working, the one-way valve 7 opens to discharge air; when it stops, it closes to prevent outside air from entering, maintain a low-pressure state inside the tower, and ensure stable cooling efficiency.

[0020] To facilitate the installation and disassembly of the filter tube, the technical solution provided in this embodiment is as follows: the end of the filter tube 3 is connected to the pipeline via a flange 8. The flange 8 is tightened with bolts to achieve a sealed connection between the pipeline and the filter tube 3, which facilitates the later replacement or cleaning of the cation exchange column 5 and improves the maintainability of the system.

[0021] To enhance the tightness and anti-loosening performance of the flange connection, the technical solution provided in this embodiment is as follows: the flange 8 is fastened by a ring bolt 9, and the bolt head of the ring bolt 9 extends to form an annular part. The annular part of the ring bolt 9 provides a larger contact area, enhances the preload, and allows for quick manual removal when replacement is needed. In particular, a screwdriver can be inserted into the annular part to increase the torque for rapid disassembly and installation.

[0022] To facilitate the installation and positioning of the cation exchange column, the technical solution provided in this embodiment is as follows: a slider 10 is provided axially on the inner sidewall of the filter tube 3; a through groove 11 is provided on the sidewall of the cation exchange column 5, the through groove 11 being adapted to the slider 10; the length of the cation exchange column 5 is less than that of the filter tube 3; a limiting ring 12 is provided at the end of the filter tube 3, the inner diameter of the limiting ring 12 being less than the outer diameter of the cation exchange column 5. During installation, the cation exchange column 5 is pushed into the filter tube 3 along the slider 10, the through groove 11 and the slider 10 cooperate to prevent rotation; the limiting ring 12 prevents it from falling out, achieving rapid positioning and fixation.

[0023] To ensure proper fit and sealing between the limiting ring and the filter tube, this embodiment provides the following technical solution: the limiting ring 12 is equipped with a limiting block 13, which is adapted to the slider 10; the limiting ring 12 has an outer edge 14 extending to the end face of the filter tube 3; when the pipeline is connected to the filter tube 3, the outer edge 14 is clamped between the two flanges 8. The limiting ring 12 is aligned with the slider 10 via the limiting block 13, and the outer edge 14 is pressed by the flanges 8 to achieve a seal, preventing water leakage and improving the system's sealing performance.

[0024] To further enhance the sealing performance at the limiting ring, the technical solution provided in this embodiment is as follows: a sealing ring 15 is fitted inside the limiting ring 12. The sealing ring 15 fills the gap between the limiting ring 12 and the cation exchange column 5, preventing short circuits or leaks in the water flow, ensuring that all water flows through the exchange column for treatment, and improving the water softening effect.

[0025] To achieve dual-path filtration and flow control, this embodiment provides the following technical solution: It also includes a circulating filtration branch pipe 16, which is connected in parallel with the filter pipe 3; the output ends of the filter pipe 3 and the circulating filtration branch pipe 16 are connected to the pipeline via a proportional valve 17. The proportional valve 17 can adjust the ratio of the two water flows according to the water quality, with one flow as the main filter and the other as a bypass or backup, extending the service life of the cation exchange column 5 and improving the system's operational flexibility.

[0026] The working principle of this utility model is as follows: cooling water is pushed from the cooling tower 2 by the cooling pump 4, flows through the cation exchange column 5 in the filter tube 3 for softening treatment, and enters the jacket 1 to cool the twin-screw extruder; the return water returns to the cooling tower 2, and efficiently evaporates and dissipates heat in the low-pressure environment maintained by the vacuum pump 6 to achieve circulating cooling; the filter tube 3 can be connected in parallel branches and the flow rate can be adjusted by the proportional valve 17, and the cation exchange column 5 can be replaced periodically. The whole system significantly reduces the requirements for water quality and operating costs while ensuring cooling efficiency.

[0027] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. An external circulation cooling system for a twin-screw extruder, characterized in that, The system includes a jacket (1) mounted on a screw extruder; a cooling tower (2) with its inlet connected to a water source and its outlet connected to the inlet of the jacket (1) via a pipeline; the outlet of the jacket (1) connected to the inlet of the cooling tower (2) via a pipeline; a filter pipe (3) and a cooling pump (4) disposed between the jacket (1) and the outlet of the cooling tower (2); a cation exchange column (5) disposed inside the filter pipe (3); the cooling tower (2) includes a tower body defining a cavity, the top of which is connected to a vacuum pump (6), the vacuum pump (6) being configured to reduce the air pressure inside the cavity to below air pressure.

2. The system according to claim 1, characterized in that: The top of the cooling tower (2) is connected to the vacuum pump (6) through an exhaust port, which is equipped with a one-way valve (7) configured to allow gas to flow from the cavity to the vacuum pump (6) only.

3. The system according to claim 1, characterized in that: The end of the filter tube (3) is connected to the pipeline via a flange (8).

4. The system according to claim 3, characterized in that: The flange (8) is fastened by a ring bolt (9), the bolt head of which extends to form an annular part.

5. The system according to claim 1, characterized in that: The inner wall of the filter tube (3) is provided with a slider (10) along the axial direction; the side wall of the cation exchange column (5) is provided with a through groove (11), which is adapted to the slider (10); the length of the cation exchange column (5) is less than that of the filter tube (3); the end of the filter tube (3) is provided with a limiting ring (12), the inner diameter of which is less than that of the outer diameter of the cation exchange column (5).

6. The system according to claim 5, characterized in that: The limiting ring (12) is provided with a limiting block (13), which is adapted to the slider (10); the limiting ring (12) is provided with an outer edge (14), which extends to the end face of the filter tube (3); when the pipeline is connected to the filter tube (3), the outer edge (14) is clamped between the two flanges (8).

7. The system according to claim 5, characterized in that: A sealing ring (15) is fitted inside the limiting ring (12).

8. The system according to claim 1, characterized in that: It also includes a circulating filter branch pipe (16), which is connected in parallel with the filter pipe (3); the output ends of the filter pipe (3) and the circulating filter branch pipe (16) are connected to the pipeline through a proportional valve (17).

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