A mist cooling device and a cooling method for improving the surface stress value of tempered glass

Abstract

The application discloses a kind of atomization cooling device and cooling method for improving the surface stress value of toughened glass, belonging to the technical field of glass deep processing.The core of the device is a 304 stainless steel double-ring water molecule atomization device and a linkage control device located 10-15 cm in front of the air inlet of a high-pressure fan, equipped with 12 brass ceramic core atomization nozzles, high-pressure air and pure water are independently pressurized, and the flow ratio adjustment precision is 0.1:1;The cooling method is to heat 3-10 mm glass to 600-650℃, trigger the atomization device to produce 5-10 μm pure water mist particles, mix with high-pressure air turbulence, and spray at a wind speed of 25-35 m / s.After the transition section, the glass is precisely quenched for 3-5 s according to the thickness.The application uses water vapor latent heat to strengthen heat exchange, which improves the surface stress value of traditional pure air-cooled glass by 32%-38%, the warpage is ≤0.2 mm / m, and there is no cracking, stress unevenness defect.Compared with the air grid atomization cooling technology, the air-water mixture is more uniform, and the device can be directly installed in the existing toughening furnace without the need for overall modification.

Description

[0001] Cooling device and cooling method Technical Field

[0002] This invention relates to the field of glass deep processing technology, specifically to an atomizing cooling device and cooling method for improving the surface stress value of tempered glass. Background Technology

[0003] The transition zone during physical tempering of glass is the core area that determines the surface stress value. Existing technologies mostly employ pure air cooling or direct spray cooling at the air grating. Pure air cooling relies solely on the sensible heat of the air, resulting in low efficiency and limited improvement in glass stress value. Direct spray cooling at the air grating suffers from uneven water mist mixing, glass warping and cracking during cooling, and requires modification of the entire air grating structure, leading to high modification costs. Furthermore, it lacks precise quenching designs for glass of different thicknesses, failing to meet the production needs of 3-10mm high-stress tempered glass. Summary of the Invention

[0004] Purpose of the invention

[0005] This invention aims to address the shortcomings of traditional air cooling and existing atomized cooling technologies, and provides an atomized cooling device and method that significantly improves stress, provides uniform cooling, and has low modification costs. It is adaptable to the modification of existing tempering furnaces and enables precise quenching of 3-10mm tempered glass.

[0006] Atomizing cooling device

[0007] The atomizing cooling device of the present invention includes a tempering furnace transition section body, a high-pressure blower (5), a high-pressure air distribution box (4), an upper air grid (1), a lower air grid (2), a water molecule atomizing device (7), and a linkage control device. The core is a front-mounted double-ring water molecule atomizing device and a precise linkage control device.

[0008] The water molecule atomizing device (7) is located 10-15cm in front of the air inlet (6) of the high-pressure blower. It adopts a double ring structure of 304 stainless steel, with independent air and water pressure supply. Twelve brass ceramic core atomizing nozzles are evenly distributed in a ring to ensure that the atomization range fully covers the air inlet. The threaded adjustment rod realizes the air-water ratio adjustment with a precision of 0.1:1. The stainless steel suspension bracket is an integrated welded structure, and the connection part is equipped with a sealing gasket to prevent air and water leakage under high temperature conditions.

[0009] The linkage control device consists of a furnace exit signal sensor and a time controller to achieve synchronous and precise linkage of the gate cylinder, pure water solenoid valve (9), and high-pressure air solenoid valve (8), ensuring that the atomization cooling and glass exit sequence are perfectly matched; the high-pressure air distribution box (4) is equipped with a flow equalization plate, and the high-pressure blower (5) is equipped with a 30° inclined impeller + arc-shaped guide ribs to achieve uniform distribution and turbulent mixing of atomized airflow.

[0010] Cooling methods

[0011] The cooling method of the present invention is based on the above-mentioned device. The core is the precise quenching process in the transition section. By quantitatively controlling parameters such as water mist particle size, air-water ratio, mixing time, jet wind speed, and quenching time, heat exchange is enhanced by utilizing the latent heat of water vaporization. Specific process parameters are matched according to different glass thicknesses of 3-10mm. Atomized cooling is performed only in the transition section, while the subsequent cooling section maintains conventional air cooling, taking into account both stress increase and cooling uniformity, and avoiding glass warping and cracking.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0013] 1) Significantly improved surface stress value: The surface stress value is increased by 32%-38% compared with traditional pure air-cooled glass, and the tempering degree is greatly improved, meeting the production requirements of high stress value tempered glass;

[0014] 2) Excellent cooling uniformity: Glass warpage ≤ 0.2mm / m, no cracks or uneven stress distribution defects, and a product qualification rate of 100%;

[0015] 3) Low modification cost and strong adaptability: The device only needs to be installed at the air inlet of the existing tempering furnace blower through the suspension bracket, without modifying the overall structure of the furnace body, and is suitable for various tempering furnace process upgrades;

[0016] 4) High adjustment accuracy and high degree of automation: The air-water ratio adjustment accuracy reaches 0.1:1, which can accurately adapt to glass of different thicknesses; the whole process is linked to automatic control, which does not require real-time manual operation and reduces labor costs;

[0017] 5) Uniform mixing and high heat exchange efficiency: The pre-atomization + turbulent mixing design achieves uniform mixing of air and water without local coalescence, making full use of the latent heat of water vaporization, and the heat exchange efficiency is much higher than that of traditional air cooling and air grid atomization cooling. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings:

[0019] Figure 1 Overall installation front view of the atomizing cooling device of the present invention (drawing scale 1:10).

[0020] Figure 2 A top view of the water molecule atomizing device of the present invention (scale 1:8).

[0021] Explanation of reference numerals in the attached figures:

[0022] Figure 1 Overall installation front view of the atomizing cooling device of the present invention;

[0023] Figure 2 A top view schematic diagram of the water molecule atomizing device of the present invention;

[0024] Reference numerals: 1-Upper air grille, 2-Lower air grille, 3-Tempered glass, 4-High-pressure air distribution box, 5-High-pressure fan, 6-High-pressure fan inlet, 7-Water molecule atomizing device, 8-High-pressure air solenoid valve, 9-Pure water solenoid valve, 201-Outer annular metal pipe, 202-Inner annular metal pipe, 203-Atomizing nozzle, 204-Pure water inlet, 205-High-pressure air inlet. Detailed Implementation

[0025] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention; all technical solutions based on the present invention fall within the protection scope of the present invention.

[0026] Example 1: Device Assembly and Debugging

[0027] Select the main body of the transition section of the conventional tempering furnace. At 12cm in front of the air inlet (6) of the high-pressure blower (5), weld the water molecule atomizing device (7) with an integrated stainless steel hanging bracket. Add rubber sealing gaskets to the connection parts. The outer ring metal pipe (201) is connected to the pure water inlet (204), the 0.6MPa high-pressure water pump and the pure water solenoid valve (9) in sequence. The inner ring metal pipe (202) is connected to the high-pressure air inlet (205), the 0.7MPa high-pressure air source and the high-pressure air solenoid valve (8) in sequence. Install the furnace discharge signal sensor at the connection between the heating section and the transition section. The time controller is electrically connected to the furnace discharge signal sensor, the gate cylinder and the two solenoid valves respectively to complete the assembly.

[0028] Start the high-pressure air source and water pump, and adjust the air-water ratio through the threaded adjustment rod to make the water mist particle size reach 7μm; set the time controller parameters so that the opening delay difference of the two solenoid valves is 0.1s, and the linkage response time of the gate cylinder and the solenoid valve is ≤0.2s; start the high-pressure blower (5), adjust the atomized air jet speed to 30m / s, confirm that there are no air leaks, water leaks, or uneven atomization problems in the device, and complete the debugging.

[0029] Example 2: Cooling Process Verification

[0030] Float glass samples with diameters of 3mm, 5mm, 8mm, and 10mm and a size of 1000mm × 800mm were selected and cooled using the apparatus of Example 1.

[0031] S1: Place the glass sample into the tempering furnace, heat it to 620℃ and then remove it from the furnace. The furnace removal signal sensor triggers the gate cylinder to push open the air inlet gate.

[0032] S2: After the air inlet damper is fully opened, the time controller controls the two solenoid valves to open synchronously, and adjusts the air-water ratio according to the glass thickness: 3mm 4:1, 5mm 3:1, 8mm 2:1, 10mm 1.5:1, to produce 7μm pure water mist particles.

[0033] S3: The high-pressure blower (5) sucks in water mist particles, mixes them with the high-pressure air turbulence for 0.2s to form an atomized airflow, and then distributes them evenly to the upper and lower air grids after passing through the high-pressure air distribution box (4);

[0034] S4: The atomized airflow is sprayed onto the upper and lower surfaces of the glass at a wind speed of 30m / s, and the water mist particles instantly vaporize and absorb heat.

[0035] S5: Quenching is completed according to thickness: 3mm / 5mm quenching for 3s, 8mm for 4s, 10mm for 5s. Then the glass enters the cooling section for conventional air cooling, the solenoid valve is closed, and the atomizing device stops working.

[0036] Tests showed that the surface stress of the samples was 32%-38% higher than that of traditional pure air cooling, the warpage was ≤0.2mm / m, there were no cracks or uneven stress defects, and the product qualification rate was 100%.

[0037] Example 3 Performance Comparison Test

[0038] The tempered glass sample from Example 2 and the same sample treated with the traditional pure air-cooling process were tested using a glass surface stress meter (accuracy ±2MPa) and a glass flatness tester (accuracy ±0.1mm / m).

[0039] The results showed that the surface stress value of the samples treated by the process of the present invention was increased by 32%-38%, the warpage was ≤0.2mm / m, and the pass rate was 100%; the surface stress value of the traditional pure air-cooled samples was low, and some had warpage and uneven stress problems, with a pass rate of only 92%-95%.

Claims

1. A misting cooling device for improving the surface stress value of tempered glass, comprising a tempering furnace transition section body, a high-pressure blower (5), a high-pressure air distribution box (4), and relatively parallel upper air grille (1) and lower air grille (2), wherein the upper air grille (1) and lower air grille (2) form a glass conveying channel and are densely covered with air jet holes facing the glass side, the outlet of the high-pressure blower (5) is connected to the high-pressure air distribution box (4), and the high-pressure air distribution box (4) is connected to the air inlets of the upper air grille (1) and the lower air grille (2), characterized in that, It also includes a water molecule atomizing device (7) and a linkage control device; The water molecule atomizing device (7) is fixed 10-15cm from the front end of the air inlet (6) of the high-pressure blower (5) by a stainless steel hanging bracket. The mist outlet faces the center of the air inlet (6). The device consists of a 304 stainless steel closed inner ring metal tube (202), an outer ring metal tube (201) and 12 evenly distributed ring atomizing nozzles (203). The outer ring metal tube (201) is connected to the pure water inlet, and the inner ring metal tube (202) is connected to the high-pressure air inlet. The atomizing nozzles (203) are made of brass and have a built-in ceramic atomizing core. Each nozzle is equipped with a high-pressure air and pure water flow ratio adjustment rod. The pure water inlet is connected to a pure water source, a 0.5-0.7MPa high-pressure water pump and a pure water solenoid valve (9), and the high-pressure air inlet is connected to a 0.6-0.8MPa high-pressure air source and a high-pressure air solenoid valve (8). The linkage control device includes a furnace discharge signal sensor and a time controller. The furnace discharge signal sensor is electrically connected to the time controller. The time controller is electrically connected to the high-pressure blower (5) air inlet gate cylinder opening signal, the pure water solenoid valve (9), and the high-pressure air solenoid valve (8), and controls the gate cylinder action and the opening and closing time and working duration of the solenoid valve according to the furnace discharge signal.

2. The atomizing cooling device according to claim 1, characterized in that, The stainless steel suspension bracket is an integral welded structure, and a sealing gasket is provided at the connection with the water molecule atomizing device (7); the adjusting rod is a threaded structure, and the flow ratio adjustment accuracy of high pressure air and pure water reaches 0.1:

1.

3. The atomizing cooling device according to claim 1, characterized in that, The gate cylinder is a pneumatic actuator, and its working pressure is matched with the high-pressure air source at 0.6-0.8MPa; the output pressure of the high-pressure water pump is preferably 0.6MPa, and the pressure of the high-pressure air source is preferably 0.7MPa.

4. The atomizing cooling device according to claim 1, characterized in that, The high-pressure air distribution box (4) is equipped with a flow equalization plate and densely packed with flow guide holes; the high-pressure blower (5) is equipped with an impeller flow guide structure, with blades distributed at a 30° angle and built-in arc-shaped flow guide ribs, so that the high-pressure air and 5-10μm pure water mist particles are turbulently mixed and evenly dispersed without local aggregation.

5. A cooling method for increasing the surface stress value of tempered glass using the apparatus described in any one of claims 1-4, characterized in that, Includes the following steps: S1: The tempering furnace heating section heats 3-10mm tempered glass to 600-650℃. After the furnace exit signal sensor detects that the glass has exited the furnace, it triggers the gate cylinder to push open the air inlet gate of the high-pressure blower (5). S2: After the air inlet gate is opened to the position, the position sensor starts the time controller, controls the high-pressure air solenoid valve (8) and the pure water solenoid valve (9) to open with a 0-0.2s delay difference, and the water molecule atomizing device (7) generates 5-10μm pure water mist particles. The air-water flow ratio is adjusted to 1.5:1-4:1 to match the glass thickness by adjusting the regulating rod. S3: The high-pressure blower (5) sucks in water mist particles, mixes them with the high-pressure air turbulence for 0.1-0.3s to form an atomized airflow, and then distributes them evenly to the upper and lower air grids after passing through the high-pressure air distribution box (4); S4: The atomized airflow is sprayed onto the upper and lower surfaces of the high-temperature glass at a wind speed of 25-35m / s. The water mist particles instantly vaporize and absorb heat, forming compressive stress on the glass surface. S5: After quenching the glass in the transition section for 3-5 seconds according to the glass thickness, the glass enters the cooling section for conventional air cooling. The time controller controls the solenoid valve to close, and the water molecule atomization device (7) stops working.

6. The cooling method according to claim 5, characterized in that, In step S2, the air-to-water ratio of 3mm glass is 4:1, 5mm glass is 3:1, 8mm glass is 2:1, and 10mm glass is 1.5:1, with a preferred water mist particle size of 7μm; in step S3, the mixing time is preferably 0.2s; in step S4, the jet wind speed is preferably 30m / s; and in step S1, the glass heating temperature is preferably 620℃.

7. The cooling method according to claim 5, characterized in that, In step S5, 3-5mm glass is quenched for 3s, 6-8mm for 4s, and 9-10mm for 5s.

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