A heat recovery device for a synthetic fiber spinning cooling system

Abstract

This invention discloses a heat recovery device for a synthetic fiber spinning cooling system in the field of synthetic fiber manufacturing technology. The device includes a refrigeration unit and a cooling assembly. The output end of the refrigeration unit is connected to the cooling assembly, and the output end of the cooling assembly is equipped with a heat exchange unit. The heat exchange unit is connected to the refrigeration unit via a return pipe. This invention integrates a thermal energy circulation system of the refrigeration unit and a drying and setting oven. It absorbs the heat energy from the spinning cooling process through refrigerant circulation and directionally transports the converted high-temperature heat energy to the drying and setting oven, achieving energy complementarity between spinning cooling and drying / setting. This design eliminates waste heat emissions from traditional cooling systems and reduces external energy consumption in the drying process, achieving a comprehensive energy-saving efficiency of over 30% and significantly reducing carbon emissions. The device employs a gradient temperature control module to ensure uniform spinning cooling, prevent internal stress in the fiber due to sudden cooling, and improve fiber physical properties and post-processing quality.

Description

Technical Field

[0001] This invention relates to the field of synthetic fiber manufacturing technology, specifically to a heat recovery device for a synthetic fiber spinning cooling system. Background Technology

[0002] In the traditional synthetic fiber spinning process, the cold air cooling system removes heat from the melt stream through forced convection. However, the waste heat generated by the refrigeration unit is directly discharged into the environment, resulting in energy waste. At the same time, the drying and shaping oven requires additional steam or electricity for heating, leading to high production energy consumption. In existing technologies, some patents attempt to optimize cooling uniformity through air-cooling components, but the waste heat recovery problem remains unsolved. Furthermore, heat recovery devices are mostly independent of the spinning process and are difficult to coordinate with the cooling system. During the cooling process of the melt, the temperature inside the continuously heated cooling cylinder rises continuously, generating heat accumulation, which reduces the cooling effect of the cooling system on the melt and affects the fiber processing effect.

[0003] Based on this, the present invention designs a heat recovery device for a synthetic fiber spinning cooling system to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a heat recovery device for a synthetic fiber spinning cooling system to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a heat recovery device for a synthetic fiber spinning cooling system, comprising a refrigeration unit and a cooling component, wherein the output end of the refrigeration unit is connected to the cooling component, the output end of the cooling component is provided with a heat exchange unit, the heat exchange unit is connected to the refrigeration unit through a return pipe, the heat exchange unit is provided with a refrigerant, one end of the heat exchange unit is connected to the interior of a heat exchanger, and the output end of the heat exchanger is connected to a dryer; The cooling assembly includes a cooling cylinder with several nitrogen pipes evenly distributed inside. A cooling fan is provided on one side of the cooling cylinder, and the cooling fan is equipped with a swing cooling mechanism for driving the cooling cylinder to rotate relative to the nitrogen pipes.

[0006] As a further embodiment of the present invention, the swing cooling mechanism includes a base, which is disposed in front of the cooling cylinder. A rotating shaft is rotatably connected to the top of the base, and the top of the rotating shaft is fixedly connected to a cooling fan. Fixed rods are fixedly connected to both sides of the rotating shaft. A swing rod three is rotatably connected to the fixed rod. A fixed plate is fixedly connected to the bottom of the cooling cylinder. A slide rail for sliding connection with the swing rod three is fixedly connected to the fixed plate. A swing rod two is rotatably connected to the top of the rotating shaft. A turntable is disposed at the top of the base. A swing rod one is rotatably connected to the top of the turntable at a non-center position. One end of the swing rod one is rotatably connected to the swing rod two.

[0007] As a further embodiment of the present invention, a support cylinder is sleeved on the outside of the cooling cylinder, and a ball bearing for rolling contact with the cooling cylinder is rotatably connected inside the support cylinder, and a support rod is fixedly connected to the bottom of the support cylinder.

[0008] As a further embodiment of the present invention, a heat-resistant tube is fixedly connected to the output end of the heat exchanger, and one end of the heat-resistant tube is connected to the dryer.

[0009] As a further embodiment of the present invention, the input ends of the nitrogen pipes are fixedly connected to a first connecting pipe, the input end of the first connecting pipe is connected to a refrigeration unit, and the output ends of the nitrogen pipes are fixedly connected to a second connecting pipe, the output end of the second connecting pipe is connected to a heat exchange unit.

[0010] As a further embodiment of the present invention, a drive motor is fixedly connected to the top of the base, and one output end of the swing arm is fixedly connected to the turntable.

[0011] As a further aspect of the present invention, the heat exchange unit is provided with an intelligent control system, which includes a temperature sensor, a proportional valve and a control unit, for adjusting the refrigerant flow and heat output of the heat exchange unit.

[0012] As a further embodiment of the present invention, the refrigeration unit adopts a compression refrigeration cycle, and the outlet temperature of the evaporator inside the refrigeration unit is controlled at 10-20℃.

[0013] Compared with the prior art, the beneficial effects of the present invention are: This invention integrates a refrigeration unit and a drying and setting oven into a thermal energy circulation system. It absorbs heat energy from the spinning cooling process through refrigerant circulation and directionally delivers the converted high-temperature heat energy to the drying and setting oven, achieving energy complementarity between spinning cooling and drying / setting. This design eliminates waste heat emissions from traditional cooling systems and reduces external energy consumption in the drying process, achieving a comprehensive energy-saving efficiency of over 30% and significantly reducing carbon emissions. The device employs a gradient temperature control module to ensure uniform spinning cooling, preventing internal stress in the fibers due to rapid cooling, improving fiber physical properties and post-processing quality. The system has a compact structure, is compatible with existing melt spinning equipment, and combines process stability with economic efficiency.

[0014] This invention utilizes a swinging heat dissipation mechanism to allow the cooling cylinder, which cools the spinning process, to reciprocate and switch positions to contact the surface of the nitrogen pipe used for cooling. This enables the cooling cylinder, which was originally far from the nitrogen pipe and in areas with severe heat accumulation, to come into contact with the nitrogen pipe, thereby cooling the accumulated heat through the nitrogen pipe, reducing the surface temperature of the cooling cylinder, and improving the cooling effect on the spinning process. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the cooling component structure; Figure 2 This is a schematic diagram of the system equipment of the present invention; Figure 3 for Figure 2 Enlarged structural diagram at point A in the middle; Figure 4 This is a schematic diagram of the front structure of the cooling component; Figure 5 This is a schematic diagram of the swing-type heat dissipation mechanism. Figure 6 This is a schematic diagram of the rotating state of the swing-type heat dissipation mechanism.

[0016] The attached diagram lists the components represented by each number as follows: 1. Refrigeration unit; 2. Connecting pipe one; 3. Cooling assembly; 4. Connecting pipe two; 5. Heat exchange unit; 6. Return pipe; 7. Connecting pipe three; 8. Heat-resistant pipe; 9. Heat exchanger; 10. Dryer; 11. Cooling cylinder; 12. Support cylinder; 13. Nitrogen pipe; 14. Radiator fan; 15. Turntable; 16. Swing arm one; 17. Drive motor; 18. Swing arm two; 19. Base; 20. Fixing rod; 21. Rotating shaft; 22. Swing arm three; 23. Fixing plate; 24. Slide rail; 25. Support rod; 26. Ball bearing. Detailed Implementation

[0017] Please see Figure 1-6 This invention provides a technical solution: a heat recovery device for a synthetic fiber spinning cooling system, comprising a refrigeration unit 1 and a cooling component 3. The refrigeration unit 1 transports cold air to the cooling component 3 via a connecting pipe 2. After absorbing heat inside the cooling component 3, the cold air is transported to a heat exchange unit 5 via a connecting pipe 4. The heat exchange unit 5 returns the cold air to the refrigeration unit 1 for circulation via a return pipe 6. The heat exchange unit 5 contains a refrigerant, which enters a heat exchanger 9 via a connecting pipe 7. The output end of the heat exchanger 9 is connected to a dryer 10 via a heat-resistant pipe 8. The heat exchange unit 5 is equipped with an intelligent control system, which includes a temperature sensor, a proportional valve, and a control unit, for adjusting the refrigerant flow rate and heat output of the heat exchange unit 5. See Figure 2 This invention constructs an integrated refrigeration-heat recovery system, comprising the following modules: Refrigeration unit 1: The refrigeration unit 1 adopts a compression refrigeration cycle, and the outlet temperature of the evaporator inside the refrigeration unit 1 is controlled at 10-20℃ to avoid fiber oxidation; Heat conversion device: The refrigerant releases heat in the condenser, and the heat energy is raised to the process temperature of 120-180℃ through the heat exchange unit 5, and then transported to the dryer 10 through the heat-resistant pipe 8; Intelligent control system: Integrates a temperature sensor and a proportional valve to adjust the refrigerant flow and heat energy output in real time to adapt to different spinning speeds and drying requirements; Example 1: Polyester chips are melted in a screw extruder at a temperature controlled at 280-300℃, and the melt is extruded through a spinneret. Low-temperature nitrogen gas at 10-15℃ is output from the refrigeration unit 1 and distributed in a ring along the cooling cylinder 11. After absorbing heat from the melt, the nitrogen gas rises to 50℃. The heated nitrogen gas enters the heat exchange unit 5 and exchanges heat with the refrigerant R134a in a countercurrent manner. The refrigerant condenses and releases heat, and the nitrogen gas cools down to 20℃ and is recycled. The heat energy is raised to 150℃ by the heat exchanger 9 and then introduced into the dryer 10. The heat energy is evenly heated to the fibers through the internal distributor of the drying oven, and the temperature fluctuation is controlled within ±2℃ to ensure fiber dimensional stability. Example 2: The output temperature of the refrigeration unit 1 was adjusted to 5-8℃ to match the high melt viscosity of polyamide; the outlet temperature of the heat exchange unit 5 was set to 180℃ to meet the drying and shaping requirements of polyamide fibers.

[0018] The cooling assembly 3 includes a cooling cylinder 11, and a plurality of nitrogen pipes 13 are equidistantly distributed inside the cooling cylinder 11. A cooling fan 14 is provided on one side of the cooling cylinder 11, and a swing cooling mechanism is provided on the cooling fan 14 for driving the cooling cylinder 11 to rotate relative to the nitrogen pipes 13. See Figure 1 The spinning process passes through the cooling cylinder 11 and is cooled by the nitrogen pipe 13, which carries away the heat from its surface. However, since the nitrogen pipe 13 cannot fully contact the surface of the cooling cylinder 11, some of the heat from the spinning process is conducted to the surface of the cooling cylinder 11 and continues to accumulate, affecting the heat dissipation effect of the nitrogen pipe 13. By using a swinging heat dissipation mechanism to drive the cooling cylinder 11 to rotate relative to the nitrogen pipe 13, the nitrogen pipe 13 switches its contact position with the cooling cylinder 11, cooling the areas where heat accumulates on the cooling cylinder 11, reducing the surface temperature of the cooling cylinder 11, and improving the heat dissipation effect on the spinning process.

[0019] As a further embodiment of the present invention, the swing cooling mechanism includes a base 19, which is disposed on the front side of the cooling cylinder 11. A rotating shaft 21 is rotatably connected to the top of the base 19. The top of the rotating shaft 21 is fixedly connected to the cooling fan 14. Fixed rods 20 are fixedly connected to both sides of the rotating shaft 21. A swing rod 3 22 is rotatably connected to the fixed rod 20. A fixed plate 23 is fixedly connected to the bottom of the cooling cylinder 11. A slide rail 24 for sliding connection with the swing rod 3 22 is fixedly connected to the fixed plate 23. A swing rod 28 is rotatably connected to the top of the rotating shaft 21. A turntable 15 is disposed at the top of the base 19. A swing rod 16 is rotatably connected to the non-center part of the top of the turntable 15. One end of the swing rod 16 is rotatably connected to the swing rod 2 18. See Figure 3 , Figures 5-6When the surface of the cooling cylinder 11 is subjected to heat treatment, the rotating turntable 15 drives the first swing arm 16 to move, the first swing arm 16 drives the second swing arm 18 to rotate by an angle θ, the second swing arm 18 drives the rotating shaft 21 to rotate synchronously, the rotating shaft 21 drives the cooling fan 14 to rotate, and adjusts the blowing angle of the cooling fan 14, thereby expanding the blowing space of the cooling fan 14 and improving the convection effect of the hot air inside the cooling cylinder 11; at the same time, the rotating shaft 21 drives the fixed rod 20 to rotate, the fixed rod 20 drives the third swing arm 22 to rotate. Since the other end of the third swing arm 22 is slidably connected to the slide rail 24, the displacement of the third swing arm 22 drives the slide rail 24 to generate a displacement of L1 synchronously. The slide rail 24 drives the cooling cylinder 11 to swing through the fixed plate 23, and with the rotation of the turntable 15, the fixed plate 23 swings back and forth, thereby driving the cooling cylinder 11 to rotate back and forth, switching the contact position between the nitrogen pipe 13 and the cooling cylinder 11, so that the nitrogen pipe 13 can fully conduct heat to the cooling cylinder 11.

[0020] As a further embodiment of the present invention, a support cylinder 12 is sleeved on the outside of the cooling cylinder 11, and a ball bearing 26 for rolling contact with the cooling cylinder 11 is rotatably connected inside the support cylinder 12. A support rod 25 is fixedly connected to the bottom of the support cylinder 12. The rolling contact between the ball bearing 26 and the cooling cylinder 11 reduces the resistance when the cooling cylinder 11 rotates, thereby facilitating the rotation of the cooling cylinder 11 by the rotating shaft 21.

[0021] As a further embodiment of the present invention, a drive motor 17 is fixedly connected to the top of the base 19, and the output end of the swing arm 16 is fixedly connected to the turntable 15. The turntable 15 is driven to reciprocate by the drive motor 17 to achieve automation. The drive motor 17 is a low-speed motor, that is, the rotation speed of the turntable 15 is relatively slow. This allows the nitrogen pipe 13 to have sufficient time to cool the heat accumulated on the cooling cylinder 11 when the cooling cylinder 11 rotates relative to the nitrogen pipe 13.

[0022] Working principle: Polyester chips are melted by a screw extruder at a temperature controlled at 280-300℃, and the melt is extruded through a spinneret; low-temperature nitrogen gas at 10-15℃ is output from the refrigeration unit 1 and distributed in a ring along the cooling cylinder 11. After absorbing heat from the melt, the temperature of the nitrogen gas rises to 50℃; the heated nitrogen gas enters the heat exchange unit 5 and exchanges heat with the refrigerant R134a in a countercurrent manner. The refrigerant condenses and releases heat, and the nitrogen gas is cooled to 20℃ and recycled; the heat energy is raised to 150℃ by the heat exchanger 9 and then fed into the dryer 10; During the surface heat treatment of the cooling cylinder 11, the rotating turntable 15 drives the first swing arm 16 to move, the first swing arm 16 drives the second swing arm 18 to rotate by an angle θ, the second swing arm 18 drives the rotating shaft 21 to rotate synchronously, the rotating shaft 21 drives the cooling fan 14 to rotate, and adjusts the blowing angle of the cooling fan 14, thereby expanding the blowing space of the cooling fan 14 and improving the convection effect on the hot air inside the cooling cylinder 11; at the same time, the rotating shaft 21 drives the fixed rod 20 to rotate, the fixed rod 20 drives the third swing arm 22 to rotate. Since the other end of the third swing arm 22 is slidably connected to the slide rail 24, the displacement of the third swing arm 22 drives the slide rail 24 to generate a displacement of L1 synchronously. The slide rail 24 drives the cooling cylinder 11 to swing through the fixed plate 23, and with the rotation of the turntable 15, the fixed plate 23 swings back and forth, thereby driving the cooling cylinder 11 to rotate back and forth, switching the contact position between the nitrogen pipe 13 and the cooling cylinder 11, so that the nitrogen pipe 13 can fully conduct heat to the cooling cylinder 11.

Claims

1. A heat recovery device of a synthetic fiber spinning cooling system, comprising a refrigeration unit (1) and a cooling assembly (3), the output end of the refrigeration unit (1) being connected with the cooling assembly (3), characterized in that: The output end of the cooling component (3) is provided with a heat exchange unit (5), which is connected to the refrigeration unit (1) through a return pipe (6). The heat exchange unit (5) is provided with a refrigerant. One end of the heat exchange unit (5) is connected to the interior of a heat exchanger (9), and the output end of the heat exchanger (9) is connected to a dryer (10). The cooling assembly (3) includes a cooling cylinder (11), and a number of nitrogen pipes (13) are evenly distributed inside the cooling cylinder (11). A cooling fan (14) is provided on one side of the cooling cylinder (11), and a swing cooling mechanism is provided on the cooling fan (14) for driving the cooling cylinder (11) to rotate relative to the nitrogen pipes (13).

2. A heat recovery device for a synthetic fiber spinning cooling system according to claim 1, characterized in that: The swing cooling mechanism includes a base (19), which is located on the front side of the cooling cylinder (11). A rotating shaft (21) is rotatably connected to the top of the base (19). The top of the rotating shaft (21) is fixedly connected to the cooling fan (14). Fixed rods (20) are fixedly connected to both sides of the rotating shaft (21). A swing rod three (22) is rotatably connected to the fixed rod (20). A fixed plate (23) is fixedly connected to the bottom of the cooling cylinder (11). A slide rail (24) for sliding connection with the swing rod three (22) is fixedly connected to the fixed plate (23). A swing rod two (18) is rotatably connected to the top of the rotating shaft (21). A turntable (15) is provided at the top of the base (19). A swing rod one (16) is rotatably connected to the top of the turntable (15) at a non-center position. One end of the swing rod one (16) is rotatably connected to the swing rod two (18).

3. A heat recovery device for a synthetic fiber spinning cooling system according to claim 1, characterized in that: The cooling cylinder (11) is fitted with a support cylinder (12) on the outside. The support cylinder (12) is rotatably connected with a ball bearing (26) for rolling contact with the cooling cylinder (11). The bottom of the support cylinder (12) is fixedly connected with a support rod (25).

4. A heat recovery device for a synthetic fiber spinning cooling system according to claim 1, characterized in that: The output end of the heat exchanger (9) is fixedly connected to a heat-resistant tube (8), and one end of the heat-resistant tube (8) is connected to the dryer (10).

5. A heat recovery device for a synthetic fiber spinning cooling system according to claim 2, characterized in that: The input end of the nitrogen pipe (13) is fixedly connected to a connecting pipe one (2), the input end of the connecting pipe one (2) is connected to the refrigeration unit (1), and the output end of the nitrogen pipe (13) is fixedly connected to a connecting pipe two (4), the output end of the connecting pipe two (4) is connected to the heat exchange unit (5).

6. A heat recovery device for a synthetic fiber spinning cooling system according to claim 2, characterized in that: The top of the base (19) is fixedly connected to a drive motor (17), and the output end of the swing arm (16) is fixedly connected to the turntable (15).

7. A heat recovery device for a synthetic fiber spinning cooling system according to claim 1, wherein: The heat exchange unit (5) is equipped with an intelligent control system, which includes a temperature sensor, a proportional valve and a control unit, for adjusting the refrigerant flow and heat output of the heat exchange unit (5).

8. A heat recovery device for a synthetic fiber spinning cooling system according to claim 1, characterized in that: The refrigeration unit (1) adopts a compression refrigeration cycle, and the outlet temperature of the evaporator inside the refrigeration unit (1) is controlled at 10-20℃.

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