A tin bath bottom cooling system with optimized air intake and airflow regulation

Abstract

This utility model relates to the field of industrial equipment cooling technology, and discloses a tin bath bottom cooling system with optimized air intake and airflow regulation, aiming to solve the problems of insufficient air intake, high energy consumption, unreasonable airflow distribution, and low control accuracy in existing tin bath bottom cooling systems. The system includes a tin bath bottom, a tin bath bottom cooling fan room, and wire mesh and a sunshade installed in the air intake section of the fan room. Multiple variable frequency fans with frequency threshold control are installed in the fan room. A first air valve and a second air valve are installed in the cooling air channels at the bottom of the tin bath. Infrared thermometers and temperature sensors are installed above the tin bath bottom and inside the bottom shell. An alarm is installed outside the fan room. A control module and a switch are also included. During operation, this system can achieve optimized air intake, on-demand fan start / stop, precise airflow distribution in each area, and automatic temperature regulation, reducing energy consumption, improving control accuracy and safety, and adapting to the needs of tin bath production.

Description

Technical Field

[0001] This utility model relates to the field of industrial equipment cooling technology, and in particular to a tin bath bottom cooling system with air intake optimization and air volume adjustment. Background Technology

[0002] The production of float glass requires melting the powdered raw materials in a furnace into molten glass, followed by shaping, annealing, and cutting to obtain qualified raw glass sheets. From high-temperature melting to gradual cooling to room temperature, numerous fans are needed for cooling. The molten glass, at approximately 1100℃, enters the float glass medium in a tin bath and is shaped using processes and equipment. It then cools to approximately 600℃ for annealing. During this cooling process, cooling is primarily achieved through bath fans, space cooling water tanks, and protective gas. To protect the bottom shell of the tin bath, multiple high-power bottom fans are used for continuous cooling, resulting in significant electricity consumption.

[0003] The existing technology has the following problems: First, the air intake area adopts a louver structure, which is prone to insufficient air intake due to the louvers blocking the air. In addition, due to the narrow air intake channel, a significant negative pressure is formed in the air intake area, resulting in increased power consumption of the bottom fan. Secondly, the existing bottom fans in the tank are all used in a two-in-one or three-in-one-backup configuration. The control method is to start another fan after one fan is at full load based on the temperature of the bottom of the tank. This control method of starting the backup machine after full load results in the single fan speed being too high and the energy consumption increasing. Third, the distribution of cooling air volume at the bottom of the tin bath is unreasonable. The cooling section temperature zone at the bottom of the tin bath requires less air volume than the heating section temperature zone and the insulation section temperature zone at the bottom of the tin bath due to the large distribution of cooling water tanks. Maintaining a high air volume in the cooling section temperature zone at the bottom of the tin bath will result in energy waste. Fourth, the existing control methods are outdated, using a manual adjustment of the frequency of the bottom fan, resulting in coarse control accuracy and delayed control time, leading to wasted electricity.

[0004] Existing patent CN222086412U discloses a cooling device for the bottom of a photovoltaic glass production tank. This device includes a cooling fan mechanism and a heat dissipation circulation mechanism. A heat sink is fixedly installed inside the heat dissipation circulation mechanism. The heat sink has a cavity inside, and a water-cooling pipe is fixedly installed at one end of the cavity. One end of the heat sink has an inlet valve and an outlet valve. By setting up the heat dissipation circulation mechanism, the high temperature at the bottom of the photovoltaic glass production tank can be circulated and cooled effectively. This can quickly and effectively cool the high temperature at the bottom of the tank, preventing hot air from being blown into the tank area from the indoor environment of the photovoltaic glass workshop, saving energy consumption and resources of the cooling fan mechanism, and effectively reducing the indoor temperature of the photovoltaic glass workshop. However, this device only achieves tank bottom cooling through the heat dissipation circulation mechanism, without optimizing the air intake. The fan control is singular and cannot accurately distribute airflow or automatically regulate temperature.

[0005] Existing patent CN214142084U discloses a novel energy-saving device for bottom fans in ultra-thin float glass tanks. This device includes a bottom fan chamber, one side of which is connected to a ventilation shaft. Multiple bottom cooling fans are connected to the bottom of the bottom fan chamber. An exhaust chamber is located within the bottom fan chamber, and the bottom cooling fans are housed within it. This device solves the problem of high temperatures inside the bottom fan chamber, which significantly reduces the cooling effect of the fans, further increasing the overall power consumption required for cooling and raising operating costs. It features a simple structure, convenient operation, and low cost, and can effectively introduce lower-temperature external air for internal circulation, thereby achieving energy savings for the fans. However, this device only relies on the exhaust chamber to introduce external air, without improving the air intake structure, lacking fan control and airflow distribution, and lacking a temperature control mechanism. Utility Model Content

[0006] The purpose of this invention is to overcome the problems of insufficient air intake in the air intake area, high energy consumption of the bottom fan, unreasonable distribution of bottom cooling air volume by area, and outdated control method of bottom fan in the existing technology, and to provide a tin bath bottom cooling system with air intake optimization and air volume adjustment.

[0007] This utility model provides a tin bath bottom cooling system with optimized airflow and air volume regulation. The system includes the tin bath bottom and a tin bath bottom cooling fan room, specifically comprising: The wire mesh is fixed within the wall mounting frame at the air inlet section of the cooling fan room at the bottom of the tin bath. A sunshade is fixed to the upper outer side of the wall mounting frame of the air inlet section of the cooling fan room at the bottom of the tin bath. Variable frequency fans, there are multiple variable frequency fans, all located inside the cooling fan room at the bottom of the tin bath; The first air valve, there are multiple first air valves, which are respectively located in the cooling air passage of the graphite baffle in the temperature zone of the tin bath bottom cooling section, the temperature zone of the tin bath bottom insulation section, and the temperature zone of the tin bath bottom heating section. The second air valve, there are multiple second air valves, which are located in the cooling air channels of the temperature zone of the bottom cooling section of the tin bath, except for the graphite baffle. Infrared thermometer, the aforementioned infrared thermometer is located on a fixed bracket above the bottom of the tin bath; Temperature sensor, wherein the temperature sensor portion is embedded and fixed within the bottom shell of the tin bath. The alarm device is located outside the cooling fan room at the bottom of the tin bath. The control module is communicatively connected to the variable frequency fan, infrared thermometer, temperature sensor and alarm. The operating frequency threshold of the variable frequency fan is preset by the control module.

[0008] Preferably, the system further includes a switch, which is communicatively connected to the control module.

[0009] Preferably, the dimensional deviations of the height and width of the wire mesh from the height and width of the wall mounting frame at the air inlet section of the tin bath bottom cooling fan room shall not exceed ±1%, based on the height and width of the wall mounting frame, and the absolute value of the deviation shall not be greater than 5mm.

[0010] Preferably, the first air valve and the second air valve are butterfly valves.

[0011] Preferably, the first air valve installed in the cooling air channel at the graphite baffle in the temperature zone of the cooling section at the bottom of the tin bath is provided with an air valve locking pin; the second air valve is provided with an air valve limiting block.

[0012] Preferably, there are at least three infrared thermometers, and the detection lenses of the infrared thermometers are respectively facing the inner surface of the molten tin carrying side of the tin bath bottom temperature zone, the tin bath bottom heat preservation zone temperature zone, and the tin bath bottom heating zone temperature zone.

[0013] Preferably, the temperature sensor is suitable for environments ranging from 50°C to 1200°C, and the temperature sensor is at least one of a thermocouple, a resistance temperature detector (RTD), or an integrated temperature sensor.

[0014] Preferably, there are at least three temperature sensors, which are respectively located in the temperature zone of the cooling section at the bottom of the tin bath, the temperature zone of the insulation section at the bottom of the tin bath, and the temperature zone of the heating section at the bottom of the tin bath.

[0015] Preferably, the control module is at least one of a PLC controller, a microcontroller, or an industrial computer.

[0016] Preferably, the communication connection is made using a wire, and the wire is wrapped with an insulating sleeve.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model provides a tin bath bottom cooling system with air intake optimization and air volume adjustment. This system replaces the louvers in the prior art by installing wire mesh at the air intake section of the tin bath bottom cooling fan room, eliminating blade obstruction, increasing air intake, and installing a sunshade above the wire mesh to achieve sun and rain protection functions and extend equipment life. This system also communicates with multiple variable frequency fans through a control module. When the operating variable frequency fan reaches the preset frequency threshold, the control module activates the backup variable frequency fan, reducing the operating frequency of a single fan under the same cooling demand, thereby reducing energy consumption. Furthermore, by setting a PID control program in the control module, the operating frequency of the variable frequency fans is adjusted by comparing the temperature monitored by thermocouples with the preset temperature, so that the cooling air volume provided by the variable frequency fans can make the temperature at the bottom of the tank approach the preset temperature, thus stabilizing the temperature change at the bottom of the tank. This system also communicates with the infrared thermometer and temperature sensor through the control module. In the working state, one of the normal working temperatures of the bottom of the tin bath is selected as the working temperature threshold. The first air valve and the second air valve are fully opened. Then the second air valve is partially closed until the highest temperature monitored by the infrared thermometer and temperature sensor is less than the above working temperature threshold, so as to realize the air volume of each area of ​​the bottom of the tin bath is distributed as needed in the industrial production process. Finally, the system also communicates with temperature sensors, alarms, and switch via the control module, enabling the control module to trigger an alarm when the temperature sensor detects an abnormal temperature, thus achieving automatic monitoring and increasing the safety factor. When equipment malfunctions or requires maintenance, the switch allows for switching between automatic and manual modes, flexibly enabling manual control or automatic operation as needed, ensuring maintenance safety and meeting temporary operation requirements. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the air inlet section of the cooling fan room at the bottom of the tin bath in Example 1.

[0019] Figure 2 This is a schematic diagram of the bottom structure of the tin bath in Example 1.

[0020] Marked in the image: 1. Sunshade; 2. Wire mesh; 3. Temperature zone of heating section at the bottom of tin bath; 4. Temperature zone of insulation section at the bottom of tin bath; 5. Temperature zone of cooling section at the bottom of tin bath; 6. Graphite retaining wall at the temperature zone of cooling section at the bottom of tin bath; 7. Cooling air channel at the bottom of tin bath. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0022] Unless otherwise specified, the terms "upper," "lower," "left," "right," "center," "inner," and "outer" used in the description of specific embodiments of this utility model to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is usually placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, and for enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0023] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," "parallel," and "coaxial" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, parallel, or coaxial. Slight tilt or deviation is permissible, as long as it does not affect the normal function of the relevant component. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," not that the structure must be perfectly horizontal; a slight tilt is acceptable. "Coaxial" means that two components are arranged as coaxially as possible, allowing them to move coaxially or approximately coaxially when their relative positions change. Alternatively, it can be simplified to mean that the corresponding device / component / element, when arranged in "horizontal," "vertical," "suspended," "parallel," or "coaxial" directions, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. For example, the deviation in the "coaxial" direction is controlled within 0.2-1mm, preferably within 0.2-0.5mm. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0024] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0025] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0026] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0027] Example 1 The air inlet section of the cooling fan room at the bottom of the tin bath, such as Figure 1 As shown: Remove the original louvers in the air intake area of ​​the fan room at the bottom of the trough. Fix the wire mesh 2, with a grid size of 50×50mm and a height and width consistent with the air intake area, to the steel frame of the original louvers using expansion bolts. Then, weld the stainless steel sunshade 1 to the external wall of the fan room at the top of the wire mesh 2 using angle steel brackets to ensure that the sunshade 1 covers the top surface of the wire mesh 2 and can provide shade and rain protection.

[0028] Three variable frequency fans are fixedly installed in the fan room at the bottom of the trough. The motor wires of the three variable frequency fans are connected to the output interface of the control module. The control module can be a commonly used industrial PLC control system. A frequency transmitter can be connected between the PLC control system and the variable frequency fans to convert the frequency signal into an analog quantity for acquisition and judgment by the PLC control system.

[0029] According to the similarity law of fans: when fans have similar geometry and the same fluid medium, power consumption is directly proportional to the cube of the rotational speed. That is, doubling the fan speed increases power consumption to eight times the original amount. Therefore, combining bottom-channel fans is particularly important for energy saving, as shown in the following operation: The PLC control system is programmed to preset a "35Hz trigger threshold". When the operating frequency of the first variable frequency fan reaches 35Hz, the PLC control system controls the start of the second variable frequency fan. When the frequencies of both variable frequency fans exceed 35Hz, the third variable frequency fan is started.

[0030] The bottom structure of the tin bath is as follows Figure 2 As shown: Butterfly valves are installed in the cooling air ducts of the tin bath bottom cooling section temperature zone 5, the tin bath bottom insulation section temperature zone 4, and the tin bath bottom heating section temperature zone 3. The butterfly valve installed in the cooling air duct 7 of the tin bath bottom cooling section temperature zone 6, the tin bath bottom insulation section temperature zone 4, and the tin bath bottom heating section temperature zone 3 is the first type of valve; the butterfly valve installed in the cooling air duct 7 of the tin bath bottom cooling section temperature zone 5 (excluding the area with the graphite baffle) is the second type of valve.

[0031] Since the tin bath bottom cooling zone 5 typically contains a large number of tin bath space cooling water tanks, it does not need to maintain the same cooling airflow as the tin bath bottom insulation zone 4 and the tin bath bottom heating zone 3. Therefore, by partially closing the second air valve, the airflow in each area of ​​the tin bath bottom during industrial production can be distributed as needed. With the first and second air valves fully open, temperature is monitored using an infrared thermometer and a temperature sensor (a thermocouple can be selected as the temperature sensor). A working temperature threshold of 120°C is chosen. The second air valve is then partially closed to maintain the cooling airflow in its ventilation area at a level where the maximum temperature detected by the infrared thermometer and thermocouple is less than 120°C, and no bottom bubbles are generated at the bottom of the tank. Experiments show that at 120°C, the second air valve is preferably closed by 15%-20%.

[0032] When the second air valve is in a suitable partially closed state, an air valve limit block is installed on the valve stem of the second air valve to keep it in the current state; at the same time, a locking pin is installed on the first air valve in the cooling air channel 7 installed in the graphite baffle 6 of the temperature zone of the cooling section at the bottom of the tin bath to keep it in the fully open state.

[0033] The infrared thermometer is fixed 1 meter above the bottom of the tank using an adjustable bracket. The thermocouple on the bottom shell is embedded in the reserved hole of the bottom shell and fixed with bolts. The signal lines of both are connected to the input interface of the PLC controller.

[0034] The PLC controller also includes PID parameters and a feedback adjustment program. It compares the temperature monitored by the thermocouples with a preset temperature and adjusts the frequency of the variable frequency fan using a frequency transmitter to bring the temperature monitored by the thermocouples closer to the preset temperature. When there are multiple thermocouples, the average value of all thermocouple readings is taken as the temperature monitored by each thermocouple.

[0035] Preferably, the preset temperature can be the average of eight values, which are the four highest temperatures in the heating section 3 of the tin bath bottom temperature zone 3 measured by the infrared thermometer, the two highest temperatures in the insulation section 4 of the tin bath bottom temperature zone 4, and the two highest temperatures in the cooling section 5 of the tin bath bottom temperature zone 5.

[0036] The temperature of any thermocouple in the heating section at the bottom of the tin bath is used as the alarm temperature. The upper limit of the alarm temperature range is set to 150℃ and the lower limit is set to 100℃. The program in the PLC controller is set to trigger the alarm when the temperature exceeds the upper and lower limits.

[0037] The aforementioned alarm and switch are connected to the PLC controller via wires, and the switch is located in the area where staff are active.

[0038] All of the above-mentioned conductors are wrapped with high-temperature resistant insulating sleeves to adapt to high-temperature working conditions and improve production safety.

Claims

1. A tin bath bottom cooling system with optimized air intake and air volume adjustment, characterized in that, The system includes the bottom of the tin bath and a cooling fan room at the bottom of the tin bath, specifically including: The wire mesh is fixed within the wall mounting frame at the air inlet section of the cooling fan room at the bottom of the tin bath; A sunshade is fixed to the upper outer side of the wall mounting frame of the air inlet section of the tin bath bottom cooling fan room; Variable frequency fans, there are multiple variable frequency fans, all located inside the cooling fan room at the bottom of the tin bath; The first air valve, there are multiple first air valves, which are respectively located in the cooling air channel of the graphite baffle in the temperature zone of the tin bath bottom cooling section, the temperature zone of the tin bath bottom insulation section, and the temperature zone of the tin bath bottom heating section. The second air valve, there are multiple second air valves, which are respectively located in the cooling air channel of the temperature zone of the bottom cooling section of the tin bath, except for the graphite baffle. An infrared thermometer, which is located on a fixed bracket above the bottom of the tin bath; A temperature sensor, wherein the temperature sensor portion is embedded in the bottom shell fixed to the bottom of the tin bath; An alarm device is located outside the cooling fan room at the bottom of the tin bath; The control module is communicatively connected to the variable frequency fan, infrared thermometer, temperature sensor and alarm. The operating frequency threshold of the variable frequency fan is preset by the control module.

2. The tin bath bottom cooling system with air intake optimization and airflow regulation according to claim 1, characterized in that, The system also includes a switch, which is communicatively connected to the control module.

3. A tin bath bottom cooling system with optimized airflow and air volume regulation according to claim 1, characterized in that, The dimensional deviations of the height and width of the wire mesh from the height and width of the wall mounting frame at the air inlet section of the tin bath cooling fan room, based on the height and width of the wall mounting frame, shall not exceed ±1%, and the absolute value of the deviation shall not be greater than 5mm.

4. A tin bath bottom cooling system with air intake optimization and airflow regulation according to claim 1, characterized in that, The first and second air valves are butterfly valves.

5. A tin bath bottom cooling system with air intake optimization and airflow regulation according to claim 1, characterized in that, The first air valve in the cooling air channel at the graphite baffle in the temperature zone of the tin bath bottom cooling section has an air valve locking pin; the second air valve has an air valve limiting block.

6. A tin bath bottom cooling system with optimized airflow and air volume regulation according to claim 1, characterized in that, There are at least three infrared thermometers, and the detection lenses of the infrared thermometers are respectively facing the inner surface of the molten tin carrying side of the tin bath bottom temperature zone, the tin bath bottom heat preservation zone temperature zone, and the tin bath bottom heating zone temperature zone.

7. A tin bath bottom cooling system with optimized airflow and air volume regulation according to claim 1, characterized in that, The temperature sensor is suitable for environments ranging from 50°C to 1200°C, and the temperature sensor is at least one of a thermocouple, a resistance temperature detector (RTD), or an integrated temperature sensor.

8. A tin bath bottom cooling system with optimized airflow and air volume regulation according to claim 1, characterized in that, There are at least three temperature sensors, which are respectively located in the temperature zone of the cooling section at the bottom of the tin bath, the temperature zone of the insulation section at the bottom of the tin bath, and the temperature zone of the heating section at the bottom of the tin bath.

9. A tin bath bottom cooling system with air intake optimization and airflow regulation according to claim 1, characterized in that, The control module is at least one of a PLC controller, a microcontroller, or an industrial computer.

10. A tin bath bottom cooling system with air intake optimization and airflow regulation according to claim 1, characterized in that, The communication connection is made using a wire, which is wrapped with an insulating sleeve.

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