High-temperature filtering, ventilating and energy-saving device suitable for polyester film transverse drawing system
By introducing a high-temperature filtration, ventilation and energy-saving device on the polyester film production line, using fin roller heat exchange and electric heating pipes to assist heating, combined with a high-temperature filter and self-cleaning device, the problems of dust pollution and high energy consumption in the production of polyester films are solved, and efficient energy saving and clean production are achieved.
Patent Information
- Application Number
- CN202422618895.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2025-08-26
- Estimated Expiration
- 2034-10-29
AI Technical Summary
During the production process of existing polyester films, the degradation of the molecular chain of polyethylene terephthalate at high temperatures leads to evaporation of low-carbon polymers, resulting in dust pollution, and high energy consumption of heat exchange and filtration equipment, which is high in maintenance costs.
The high-temperature filtration ventilation and energy-saving device including ventilation, heat exchange, filtration, electric auxiliary heat and fin self-cleaning units is adopted. The fin roller heat exchange, electric heating pipe assisted heating and high-temperature filter filtration are used, and combined with the fin self-cleaning device, efficient heat exchange and cleaning filtration are achieved.
It reduces the energy consumption of the polyester film production line, reduces the frequency of high-temperature network replacement, provides a stable and clean air inlet, reduces film dust, and achieves energy saving and clean production.
Smart Images
Figure CN223266255U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of plastic film production, in particular to a high-temperature filtering, ventilation and energy-saving device suitable for a polyester film horizontal stretching system. Background Art
[0002] Biaxially oriented polyester film production lines are the industry's mainstream transverse stretching process. Chain clamps hold the film sheets at both ends and pass them through the equipment's high-temperature transverse stretching oven. The transverse stretching process consists of four main stages: preheating, stretching, shaping, and cooling. BOPET film sheets are primarily made of polyethylene terephthalate (PET). At elevated temperatures, the PET molecular chains degrade and volatilize into the air. Low-carbon polymers form in the oven's cooling zone, and the degraded gases condense into dust at lower temperatures. This dust accumulates on the bellows in the transverse stretching cooling zone, where it accumulates to a certain level and falls onto the BOPET film product, causing serious product contamination. To address this issue, the industry primarily uses ventilation and filtration heat exchange to reduce the concentration of volatilized low-carbon polymers within the transverse stretching process, thereby minimizing dust generation. However, heat exchange and ventilation lead to significant heat loss within the oven, significantly increasing energy consumption. Heat exchange equipment alone cannot meet filtration requirements, resulting in poor product cleanliness. At the same time, the faster the production speed, the greater the product extrusion volume and the thicker the thickness, the more serious the volatilization of low-carbon polymer, the frequency of replacement of high-temperature filters increases significantly, and the maintenance cost remains high.
[0003] To this end, we propose a high-temperature filtration, ventilation and energy-saving device suitable for polyester film horizontal stretching system to solve the above problems. Utility Model Content
[0004] The purpose of the utility model is to solve the shortcomings of the prior art and to propose a high-temperature filtering, ventilation and energy-saving device suitable for a polyester film horizontal stretching system.
[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:
[0006] A high-temperature filtration, ventilation and energy-saving device for a polyester film horizontal stretching system includes a device body, which is composed of five parts: a ventilation unit, a heat exchange unit, a filtration unit, an electric auxiliary heating unit, and a fin self-cleaning unit. The ventilation unit includes a first fresh air duct and a second fresh air duct connected to each other, as well as a first exhaust duct and a second exhaust duct connected to each other.
[0007] The heat exchange unit includes a first cavity and a second cavity that are integrally arranged, the first cavity is arranged between the first exhaust duct and the second exhaust duct, the second cavity is arranged between the first fresh air duct and the second fresh air duct, and fin rollers are installed inside the first cavity and the second cavity;
[0008] The filter unit includes a first filter bellows and a second filter bellows, and a high-temperature filter screen installed between the first filter bellows and the second filter bellows. The first filter bellows is connected to the first fresh air duct. The electric auxiliary heating unit includes an electric heating tube electrically installed on the second filter bellows. The fin self-cleaning unit includes a compressed air pipe and a water pipe arranged inside the first exhaust duct. The compressed air pipe and the water pipe are both fixedly provided with sliders. The two sliders are both threaded on a screw rod. The screw rod is driven to rotate by a cleaning motor. The cleaning motor is fixedly installed on the outside of the first exhaust duct.
[0009] Preferably, a post-heat exchange bellows air outlet is provided on the top of the second exhaust duct, and a pre-heat exchange bellows inlet is provided on the side of the second fresh air duct.
[0010] Preferably, the fin roller is matched with a transmission motor for driving the rotation thereof, and the fin roller comprises a roller and a plurality of hole-shaped fins uniformly arranged on the roller.
[0011] Preferably, the high-temperature filter is detachably arranged between the first filter bellows and the second filter bellows.
[0012] Preferably, the electric heating tube is matched with a controller, and the temperature of the electric heating tube can be set through the controller.
[0013] Preferably, a first limit sensor and a second limit sensor are installed inside the first exhaust duct, and the first limit sensor and the second limit sensor are respectively arranged at two ends of the screw rod.
[0014] Preferably, a sewage outlet is provided at the bottom of the second exhaust duct.
[0015] Compared with the prior art, the beneficial effects of the present invention are:
[0016] The utility model is capable of completing high-efficiency heat exchange and clean filtration processes by setting a ventilation unit, a heat exchange unit, a filtration unit, an electric auxiliary heating unit and a fin self-cleaning unit, greatly reducing the energy consumption of horizontal heat exchange of the polyester film production line, and effectively reducing the replacement frequency of the high-temperature network to achieve the purpose of energy saving, while stably providing the needs of horizontal high-temperature heat exchange, clean air intake, and reducing dust on the film surface. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, it is possible for a person skilled in the art to derive other drawings based on these drawings without inventive effort.
[0018] Figure 1 This is the first axonometric drawing of the present utility model;
[0019] Figure 2 This is the second axonometric drawing of the present utility model;
[0020] Figure 3 This is a schematic cross-sectional view of the fin roller and self-cleaning device of the present invention;
[0021] Figure 4 This is a schematic structural diagram of the fin roller transmission of the present utility model;
[0022] Figure 5 This is a schematic diagram of the top cross-sectional structure of the filter unit and electric auxiliary heating unit box of the present invention.
[0023] In the figure: 100, first exhaust duct; 101, second exhaust duct; 102, air box outlet after heat exchange; 200, first fresh air duct; 201, second fresh air duct; 202, air box inlet before heat exchange; 300, first cavity; 301, second cavity; 302, perforated fin; 303, transmission motor; 400, first filter bellows; 401, second filter bellows; 500, high-temperature filter; 600, controller; 601, electric heating tube; 700, cleaning motor; 800, sewage outlet; 900, compressed air pipe; 1000, screw rod; 1100, first limit sensor; 1101, second limit sensor; 1200, water pipe. DETAILED DESCRIPTION
[0024] The following will be combined with the accompanying 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.
[0025] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.
[0026] Reference Figure 1-5A high-temperature filtration, ventilation and energy-saving device for a polyester film horizontal stretching system includes a device body, which is composed of five parts: a ventilation unit, a heat exchange unit, a filtration unit, an electric auxiliary heating unit, and a fin self-cleaning unit. The ventilation unit includes a first fresh air duct 200 and a second fresh air duct 201 connected to each other, as well as a first exhaust duct 100 and a second exhaust duct 101 connected to each other.
[0027] The heat exchange unit includes an integrally arranged first cavity 300 and a second cavity 301. The first cavity 300 is arranged in communication between the first exhaust duct 100 and the second exhaust duct 101. The second cavity 301 is arranged between the first fresh air duct 200 and the second fresh air duct 201. Fin rollers are installed inside the first cavity 300 and the second cavity 301 to achieve the effect of intermediate heat exchange.
[0028] The filter unit includes a first filter bellows 400 and a second filter bellows 401, as well as a high-temperature filter screen 500 installed between the first filter bellows 400 and the second filter bellows 401. The first filter bellows 400 is connected to the first fresh air duct 200. The electric auxiliary heating unit includes an electric heating tube 601 electrically installed on the second filter bellows 401. The fin self-cleaning unit includes a compressed air pipe 900 and a water pipe 1200 arranged inside the first exhaust duct 100. The compressed air pipe 900 and the water pipe 1200 are both fixedly provided with sliders. Both sliders are threaded onto a screw 1000. The screw 1000 is driven to rotate by a cleaning motor 700. The cleaning motor 700 is fixedly installed outside the first exhaust duct 100. The compressed air pipe 900 and the water pipe 1200 are respectively connected to the corresponding high-pressure gas pipe and high-pressure water pipe, and are both equipped with corresponding solenoid valves.
[0029] As a technical optimization solution of the present invention, a post-heat exchange bellows tuyere 102 is provided at the top of the second exhaust duct 101, i.e., the first exhaust duct 100 corresponds to the pre-heat exchange duct for the exhaust gas, the first exhaust duct 100 is provided with an exhaust gas inlet, and the second exhaust duct 101 corresponds to the post-heat exchange duct for the exhaust gas, with the exhaust gas ultimately discharged from the post-heat exchange bellows tuyere 102. A pre-heat exchange bellows inlet 202 is provided on the side of the second fresh air duct 201, i.e., the second fresh air duct 201 corresponds to the pre-heat exchange duct for the fresh air, the first fresh air duct 200 corresponds to the post-heat exchange duct for the fresh air, and the pre-heat exchange bellows inlet 202 is the fresh air inlet. An existing blower can be provided on the top of the pre-heat exchange bellows inlet 202 to assist in the transportation of gas entering.
[0030] As a technical optimization solution of the present invention, the fin roller is equipped with a transmission motor 303 to drive its rotation. The fin roller comprises a roller and a plurality of perforated fins 302 evenly arranged on the roller. The perforated fins 302 are sheets with multiple through-holes. The fin roller absorbs and exchanges heat through the perforated fins 302. The fin roller is driven by the transmission motor 303 to achieve unidirectional uniform speed operation, achieving heat exchange between the first cavity 300 and the second cavity 301. The heat exchange function ceases when the transmission is stopped.
[0031] As a technical optimization solution of the present invention, the high-temperature filter 500 is detachably disposed between the first filter bellows 400 and the second filter bellows 401. Specifically, a housing is detachably disposed between the first filter bellows 400 and the second filter bellows 401, and the high-temperature filter 500 is mounted within the housing. The high-temperature filter 500 is not limited to a single unit; multiple units can be arranged in a matrix or multiple layers. Furthermore, the high-temperature filter 500 can be replaced with a standard filter depending on the heat exchange temperature requirements.
[0032] As a technical optimization solution of the present invention, the electric heating tube 601 is matched with a controller 600. The temperature of the electric heating tube 601 can be set through the controller 600. That is, the electric heating tube 601 of the electric auxiliary heating unit can detect the temperature and feedback the temperature, and control the power through the controller 600 to implement auxiliary heating. According to demand, the electric auxiliary heating unit can be deactivated when the heat exchange temperature meets the processing requirements.
[0033] As a technical optimization solution of the present invention, a first limit sensor 1100 and a second limit sensor 1101 are installed inside the first exhaust duct 100. The first limit sensor 1100 and the second limit sensor 1101 are respectively arranged at the two ends of the screw 1000. That is, the cleaning motor 700 drives the screw 1000 to rotate, and the rotation of the screw 1000 drives the compressed air pipe 900 and the water pipe 1200 to move. When the screw 1000 moves in a single direction and reaches the corresponding first limit sensor 1100 or second limit sensor 1101, it triggers the screw 1000 to rotate in the opposite direction.
[0034] As a technical optimization solution of the present invention, a sewage outlet 800 is provided at the bottom of the second exhaust duct 101. Sewage generated by cleaning can be discharged through the sewage outlet 800.
[0035] In the present invention, the working principle of the device is as follows:
[0036] During operation, heat exchange gas is drawn horizontally from the first exhaust duct 100 into the heat exchange unit, where it undergoes heat exchange through the fin rollers. Heat from the exhaust gas is absorbed by the fin rollers, and the drive motor 303 rotates at a uniform speed in one direction. The multiple perforated fins 302 of the fin rollers located in the first chamber 300 absorb heat evenly. The exhaust gas temperature after heat exchange is then reduced, and it is discharged into the second exhaust duct 101 and discharged from the post-heat exchange bellows vent 102. Depending on local emission requirements, the exhaust gas discharged from the post-heat exchange bellows vent 102 can be connected to an activated carbon purification device and then discharged to the outdoor environment. The heat exchange function ceases when the drive motor 303 stops. Clean fresh air enters the second fresh air duct 201 through the pre-heat exchange bellows inlet 202 and undergoes heat exchange through the fin rollers of the heat exchange unit. This means that the airflow passes through the multiple perforated fins 302 rotating in the second chamber 301, achieving a heating effect on the fresh air flow. The fresh air, heated by the fin rollers, then enters the first fresh air duct 200. The first fresh air duct 200 is connected to the first filter air box 400 of the filter unit, and is ultimately filtered through the high-temperature filter 500 into clean fresh air. The filtered clean fresh air is then further heated using the electric auxiliary heating unit, depending on production and processing needs. If the temperature of the fresh air after heat exchange is insufficient, active heating can be used to increase the temperature. This can be done by heating with the electric heating tube 601. The electric heating tube 601 of the electric auxiliary heating unit can detect and feedback the temperature, control the power level through the controller 600, implement auxiliary heating, and, as needed, deactivate the electric auxiliary heating unit when the heat exchange temperature meets processing requirements. Finally, clean, appropriately heated fresh air enters the production line, completing a highly energy-efficient heat exchange and clean filtration process.
[0037] During the use of the fin roller, several porous fins 302 will also absorb dust from the exhaust gas, and the self-cleaning device arranged in the first exhaust duct 100 can clean the fin roller. During cleaning, the cleaning motor 700 is started to drive the screw rod 1000 to rotate. The rotation of the screw rod 1000 drives the compressed air pipe 900 and the water pipe 1200 to move up and down. A first limit sensor 1100 and a second limit sensor 1101 are respectively provided at both ends of the screw rod 1000, that is, the cleaning motor 700 drives the screw rod 1000 to rotate, and the screw rod 1000 rotates to drive the compressed air pipe 900 and the water pipe 1200 to move. After running in a single direction to the corresponding first limit sensor 1100 or the second limit sensor 1101, the screw rod 1000 is triggered to rotate in the opposite direction. At the same time, the compressed air pipe 900 and the water pipe 1200 are opened to complete the cleaning, that is, the rotating fin roller is cleaned to achieve cleaning of the entire area of the fin roller. The fin self-cleaning unit can directly clean the multiple perforated fins 302 of the fin roller during production. The cleaning time can be set by the time relay. The wastewater generated by cleaning is discharged through the sewage outlet 800, and the exhaust gas is discharged through the exhaust duct after heat exchange and the bellows tuyere 102.
[0038] This device can significantly reduce the energy consumption of horizontal heat exchange in polyester film production lines, and effectively reduce the replacement frequency of high-temperature screens to achieve energy saving. At the same time, it can stably provide horizontal high-temperature heat exchange, clean air intake, and reduce dust on the film surface.
[0039] It should be noted that when the several porous fins 302 of the fin roller rotate evenly for heat exchange, some exhaust gas will enter the second cavity 301 below, that is, enter the first fresh air duct 200 and the second fresh air duct 201, and then carry a very small amount of dust with it, but this part of the dust will be filtered by the high-temperature filter 500, effectively avoiding the impact on production.
[0040] It should be noted that during the cleaning process of the fin self-cleaning unit, the compressed air pipe 900 and the water pipe 1200 respectively spray gas and water. The sprayed gas and water are pressurized, and the gas is in front and the water is behind. The gas can blow through the several porous fins 302, and then the water is cleaned. The water is sprayed into the second exhaust duct 101 and collected in the second exhaust duct 101, and finally discharged through the sewage outlet 800. Although there is a situation where a very small amount of water is brought into the second cavity 301 as the several porous fins 302 rotate, that is, brought into the first fresh air duct 200 and the second fresh air duct 201, the first fresh air duct 200 and the second fresh air duct 201 can be set at a certain inclination angle so that part of the inflowing water is discharged through the heat exchange front bellows inlet 202.
[0041] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A high-temperature filtration, ventilation and energy-saving device suitable for a polyester film horizontal stretching system, comprising a device body, characterized in that: The device body consists of five parts: a ventilation unit, a heat exchange unit, a filter unit, an electric auxiliary heating unit, and a fin self-cleaning unit. The ventilation unit includes a first fresh air duct (200) and a second fresh air duct (201) that are connected, and a first exhaust duct (100) and a second exhaust duct (101) that are connected. The heat exchange unit comprises a first cavity (300) and a second cavity (301) which are integrally arranged, the first cavity (300) being arranged in communication between the first exhaust duct (100) and the second exhaust duct (101), the second cavity (301) being arranged between the first fresh air duct (200) and the second fresh air duct (201), and fin rollers being installed inside the first cavity (300) and the second cavity (301); The filter unit comprises a first filter bellows (400) and a second filter bellows (401), and a high-temperature filter screen (500) installed between the first filter bellows (400) and the second filter bellows (401); the first filter bellows (400) is in communication with the first fresh air duct (200); the electric auxiliary heating unit comprises an electric heating tube (601) electrically installed on the second filter bellows (401); the fin self-cleaning unit comprises a compressed air pipe (900) and a water pipe (1200) arranged inside the first exhaust duct (100); the compressed air pipe (900) and the water pipe (1200) are both fixedly provided with sliders; the two sliders are both threadedly sleeved on a screw rod (1000); the screw rod (1000) is driven to rotate by a cleaning motor (700); and the cleaning motor (700) is fixedly installed outside the first exhaust duct (100).
2. The high-temperature filtration, ventilation and energy-saving device for polyester film horizontal stretching system according to claim 1 is characterized in that: A post-heat exchange bellows air outlet (102) is provided on the top of the second exhaust duct (101), and a pre-heat exchange bellows inlet (202) is provided on the side of the second fresh air duct (201).
3. The high-temperature filtration, ventilation and energy-saving device for polyester film horizontal stretching system according to claim 1 is characterized in that: The fin roller is matched with a transmission motor (303) for driving the fin roller to rotate. The fin roller comprises a roller and a plurality of hole-shaped fins (302) evenly arranged on the roller.
4. The high-temperature filtration, ventilation and energy-saving device for polyester film horizontal stretching system according to claim 1 is characterized in that: The high-temperature filter screen (500) is detachably arranged between the first filter bellows (400) and the second filter bellows (401).
5. The high-temperature filtration, ventilation and energy-saving device for polyester film horizontal stretching system according to claim 1 is characterized in that: The electric heating tube (601) is matched with a controller (600), and the temperature of the electric heating tube (601) can be set through the controller (600).
6. The high-temperature filtration, ventilation and energy-saving device for polyester film horizontal stretching system according to claim 1 is characterized in that: A first limit sensor (1100) and a second limit sensor (1101) are installed inside the first exhaust duct (100), and the first limit sensor (1100) and the second limit sensor (1101) are respectively arranged at two ends of the screw rod (1000).
7. The high-temperature filtration, ventilation and energy-saving device for polyester film horizontal stretching system according to claim 1 is characterized in that: A sewage outlet (800) is provided at the bottom of the second exhaust duct (101).