Precise annealing furnace for glass

Abstract

The utility model discloses a precise annealing furnace for glass, comprising: a furnace body having a hearth; the heater is used for heating the atmosphere in the hearth; and the dehumidification assembly comprises a dehumidification device and air extraction equipment, the dehumidification device, the air extraction equipment and the hearth are communicated through pipelines to form a circulation loop, and the dehumidification assembly is used for extracting part of the atmosphere in the hearth and sending the atmosphere back into the hearth after dehumidification treatment. In the annealing process, under the action of the air extractor, part of the atmosphere in the hearth is extracted into the dehumidification device, and the part of the atmosphere is dehumidified and then returns into the hearth to be mixed with the atmosphere in the hearth, so that the atmosphere humidity in the hearth is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of glass production, and in particular to a precision annealing furnace for glass. Background Art

[0002] High-performance laser neodymium glass is a heat-sensitive material. Rapid temperature rise and fall will cause the material to burst, and the material has strong water absorption. Therefore, during the annealing process of high-performance laser neodymium glass, it is necessary to ensure that the atmosphere in the furnace is below a certain humidity to ensure the annealing quality of high-performance laser neodymium glass. Humidity and temperature are highly correlated, so it is particularly important to control humidity during the temperature rise and fall process.

[0003] The optical glass rotary annealing resistance furnace disclosed in the Chinese utility model patent document with announcement number CN201109751 Y has a load-bearing rotating device designed at the bottom of the furnace to solve the problem of uniform temperature control during heating and cooling. The load-bearing rotating device is composed of a rotating workbench and a shelf device and is used for rotating the optical glass.

[0004] The Chinese invention patent document with announcement number CN108129011 B discloses a precision annealing furnace for large-size optical glass, which mainly solves the problems of optical glass cracking and annealing non-uniformity caused by uneven temperature rise and fall when the existing annealing furnace is used for annealing large-size optical glass. However, it cannot ensure that the humidity of the atmosphere in the furnace is effectively controlled, so it cannot meet the annealing quality requirements of high-performance laser neodymium glass. Utility Model Content

[0005] The present application provides a precision annealing furnace for glass, which can effectively reduce the humidity in the furnace during the annealing process and meet the annealing quality requirements of high-performance laser neodymium glass.

[0006] Precision annealing furnace for glass, including:

[0007] A furnace body having a furnace chamber;

[0008] A heater, used to heat the atmosphere in the furnace;

[0009] The dehumidification component includes a dehumidification device and an exhaust device. The dehumidification device, the exhaust device and the furnace are connected through pipelines to form a circulation loop for extracting part of the atmosphere in the furnace and returning it to the furnace after dehumidification treatment.

[0010] During the annealing process, part of the atmosphere in the furnace is extracted into the dehumidification device by the exhaust equipment. After being dehumidified, this part of the atmosphere returns to the furnace and mixes with the atmosphere in the furnace to reduce the humidity of the atmosphere inside the furnace.

[0011] Several optional methods are also provided below, but they are not intended to be additional limitations on the above-mentioned overall solution, but are merely further supplements or preferences. Under the premise that there are no technical or logical contradictions, each optional method can be combined with the above-mentioned overall solution separately, and multiple optional methods can also be combined.

[0012] Optionally, the dehumidification device includes a preheater and a dryer; the preheater, dryer and exhaust device are arranged in any order in the gas flow direction. The extracted part of the gas is dehumidified, dried and preheated by the dehumidification device before being sent back to the furnace, so as to better reduce the humidity in the furnace.

[0013] Optionally, the exhaust equipment, dryer and preheater are arranged in sequence along the gas flow direction.

[0014] Optionally, the dehumidification component also includes a temperature and humidity transmitter for online detection of the gas extracted from the furnace.

[0015] Optionally, the temperature and humidity transmitter is connected to the pipeline connecting the exhaust device and the furnace through a branch pipe. The atmosphere extracted from the furnace is introduced into the temperature and humidity transmitter through the branch to test the temperature and humidity of the atmosphere, so as to better control the humidity of the atmosphere in the furnace.

[0016] Optionally, the dryer is selected from known dryers, such as a compression refrigeration dehumidifier unit, which uses a compressor refrigeration system to reduce the evaporator surface to below the dew point temperature of the air. At this time, when the humid air passes through the evaporator, the water in the air will condense and be collected along the hydrophilic platinum of the evaporator and then discharged. The dehumidified and dried cold air enters the subsequent pipeline.

[0017] Optionally, the preheater is selected from known preheaters, such as a pipeline heater, which preheats the dry cold air passing through the internal electric heating tube element, and then enters the furnace flow channel and mixes with the gas inside the furnace again after preheating, thereby reducing the humidity in the furnace and ensuring the normal operation of glass annealing. At the same time, the preheated dry gas enters the furnace flow channel for mixing, which can also reduce the thermal shock brought to the working area inside the furnace.

[0018] Optionally, the air extraction device is a fan.

[0019] On the basis of solving the problem of controlling the humidity of the atmosphere in the furnace, the present application further optimizes the temperature control of the atmosphere in the furnace. Optionally, the side wall of the furnace has a hollow interlayer and a vent connecting the interlayer and the furnace, and the heater is located in the interlayer; a power device for driving the atmosphere to circulate between the interlayer and the furnace is provided in the interlayer. Under the action of the power device, hot air circulates in the furnace, making the temperature in the entire furnace more uniform and easier to control.

[0020] Optionally, the vent includes a first vent as an interlayer air inlet and a second vent as an interlayer air outlet; the power device is arranged at the second vent to drive the atmosphere in the furnace into the interlayer from the first vent and then return to the furnace from the second vent to cycle.

[0021] Optionally, the furnace body has a furnace door, the first vent is distributed adjacent to the furnace door, and the second vent is arranged opposite to the furnace door.

[0022] Optionally, the power equipment is a circulation fan.

[0023] Optionally, the air inlet of the dehumidification component is connected to the furnace, and the air outlet is connected to the interlayer.

[0024] Optionally, the heater is a resistance wire heater.

[0025] Driven by the power equipment, the gas in the furnace enters the interlayer from the first vent, is heated by the heater in the interlayer, and then returns to the furnace from the second vent. The hot air in the furnace is always in a circulating state. At the same time, during the hot air circulation process in the furnace, the dehumidification component extracts part of the hot air in the furnace and sends it back to the interlayer after dehumidification and preheating to mix with the atmosphere in the furnace, thereby reducing the humidity of the atmosphere in the furnace.

[0026] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0027] (1) The entire furnace is heated by resistance heating, and the power and speed of the circulating fan are controlled to ensure that the temperature inside the furnace reaches the designed temperature absolute value and uniformity, and the temperature change process is controlled to conform to the designed annealing process curve, and finally an effective annealing process is achieved. The temperature uniformity between various high-performance laser neodymium glass materials is within ±3°C.

[0028] (2) By setting up a dehumidification and preheating air system, the return air is dehumidified and dried, and then preheated and introduced into the interlayer flow channel in the furnace to mix with the internal gas again, thereby reducing the humidity in the furnace and ensuring the normal operation of the neodymium glass annealing.

[0029] (3) Provide online humidity detection capability. The atmosphere in the furnace is introduced into the detection section through a branch pipeline. The humidity and temperature in the test end are measured by a high-quality temperature and humidity transmitter. The humidity of the atmosphere in the furnace is controlled to be less than 20%, which provides a strong guarantee for efficiently obtaining high-quality, high-performance laser neodymium glass materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the structure of the precision annealing furnace of this application.

[0031] The reference numerals shown in the figures are as follows:

[0032] 1. Furnace door; 2. Furnace body; 3. Heater; 4. Interlayer; 5. Furnace; 6. Power equipment; 7. Temperature and humidity transmitter; 8. Exhaust equipment; 9. Return air duct; 10. Dryer; 11. Preheater;

[0033] A. First vent; B. Second vent. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0036] like Figure 1 As shown, a precision annealing furnace for glass includes a furnace body 2, a heater 3 and a dehumidification component. The furnace body 2 has a furnace chamber 5. The annealing process is completed in the furnace chamber 5. During the annealing process, the atmosphere in the furnace chamber 5 is heated by the heater 3. The dehumidification component includes a dehumidification device and an exhaust device 8. The dehumidification device, the exhaust device 8 and the furnace chamber 5 are connected by pipelines to form a circulation loop. During the annealing process, under the action of the exhaust device 8, part of the atmosphere in the furnace chamber is extracted into the dehumidification device. After being dehumidified, the part of the atmosphere returns to the furnace chamber and mixes with the atmosphere in the furnace chamber to reduce the humidity of the atmosphere inside the furnace chamber.

[0037] As an embodiment of the dehumidification device, it includes a preheater 11 and a dryer 10. The preheater, dryer and exhaust device can be arranged in any order along the gas flow direction. In a preferred embodiment, the exhaust device 8, dryer 10 and preheater 11 are arranged in sequence along the gas flow direction. The exhaust device 8, dryer 10, preheater 11 and furnace 5 are connected to form a circulation loop by a return air duct 9. The air inlet of the exhaust device 8 is connected to the furnace 5 through the return air duct, and the air outlet of the preheater 11 is connected to the furnace 5 through the return air duct. Further optimization also includes a temperature and humidity transmitter 7 for online detection of the gas extracted from the furnace. The humidity transmitter 7 is connected to the return air duct connecting the exhaust device 8 and the furnace 5 through a branch pipe. The detected temperature and humidity can directly reflect the temperature and humidity of the atmosphere in the furnace. The exhaust device is selected from known exhaust equipment, for example, a fan can be used.

[0038] On the basis of solving the problem of humidity in the furnace atmosphere, in order to better control the temperature of the atmosphere in the furnace, in a preferred embodiment, the side wall of the furnace has a hollow interlayer 4 and a vent connecting the interlayer 4 and the furnace 5, the heater 3 is located in the interlayer 4, and the heater can be a resistance wire heater; the interlayer 4 is also provided with a power device 6 for driving hot air to circulate between the interlayer 4 and the furnace 5. Driven by the power device 6, hot air circulates in the furnace, making the temperature in the entire furnace more uniform and easier to control.

[0039] There are multiple vents on the side wall, including a first vent A as an air inlet for the interlayer and a second vent B as an air outlet for the interlayer, and the power device 6 as mentioned above is located at the second vent B. As a setting mode of the relative positions of the first vent and the second vent, the first vent is arranged adjacent to the furnace door 1, and the second vent is arranged opposite to the furnace door 1 and located at the center of the corresponding side wall.

[0040] As a specific choice of the power device 6, a circulating fan can be used, and the circulating fan is arranged at the second vent. When the circulating fan is started, negative pressure is formed in the interlayer 4, and hot air enters the interlayer 4 from the first vent, is heated by the heater 3, and then is drawn into the furnace 5 through the second vent by the power device 6, thereby performing hot air circulation.

[0041] In the embodiment where the interlayer is provided on the inner wall of the furnace, the air inlet of the dehumidification assembly is connected to the furnace 5, and the air outlet of the dehumidification assembly is connected to the interlayer 4. More specifically, the air inlet of the exhaust device 8 is connected to the furnace 5 through the return air duct, and the air outlet of the preheater 11 is connected to the interlayer 4 through the return air duct.

[0042] Taking laser neodymium glass annealing as an example, one working mode of the utility model is as follows:

[0043] The laser neodymium glass to be annealed is placed in the furnace, the furnace door is closed, and a closed environment is formed in the furnace. The entire furnace is heated by resistance heating. Under the joint action of the heater and the circulating fan, the hot air circulates between the furnace and the interlayer. The power and speed of the circulating fan can be controlled to ensure that the temperature at various locations inside the furnace reaches the designed temperature absolute value and uniformity, and the temperature change process is controlled to comply with the designed annealing process curve, ultimately achieving an effective annealing process. The temperature uniformity between various high-performance laser neodymium glass materials is within ±3°C.

[0044] While the annealing process is in progress, part of the atmosphere in the furnace is extracted through the exhaust equipment, and the return air is dehumidified, dried and preheated before being introduced into the interlayer flow channel in the furnace to be mixed with the internal atmosphere again, thereby reducing the humidity in the furnace and ensuring the normal operation of the neodymium glass annealing. During the annealing process, the atmosphere extracted from the furnace is introduced into the detection section through a branch pipeline, and the humidity and temperature in the test end are measured by a high-quality temperature and humidity transmitter, and the atmosphere humidity in the furnace is controlled to be less than 20%, which provides a strong guarantee for the efficient acquisition of high-quality, high-performance laser neodymium glass materials.

[0045] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A precision annealing furnace for glass, characterized in that: include: A furnace body having a furnace chamber; A heater, used to heat the atmosphere in the furnace; The dehumidification component includes a dehumidification device and an exhaust device. The dehumidification device, the exhaust device and the furnace are connected through pipelines to form a circulation loop for extracting part of the atmosphere in the furnace and returning it to the furnace after dehumidification treatment.

2. The precision annealing furnace according to claim 1, characterized in that: The dehumidification device comprises a preheater and a dryer; the preheater, the dryer and the exhaust equipment are arranged in any order in the flow direction of the gas.

3. The precision annealing furnace according to claim 2, characterized in that: The exhaust equipment, the dryer and the preheater are arranged in sequence along the gas flow direction.

4. The precision annealing furnace according to claim 3, characterized in that: The dehumidification component also includes a temperature and humidity transmitter for online detection of the gas extracted from the furnace.

5. The precision annealing furnace according to claim 4, characterized in that: The temperature and humidity transmitter is connected to the pipeline connecting the exhaust equipment and the furnace through a branch pipe.

6. The precision annealing furnace according to claim 1, characterized in that: The side wall of the furnace has a hollow interlayer and a vent connecting the interlayer and the furnace, and the heater is located in the interlayer; a power device for driving the atmosphere to circulate between the interlayer and the furnace is arranged in the interlayer.

7. The precision annealing furnace according to claim 6, characterized in that: The vents include a first vent as an interlayer air inlet and a second vent as an interlayer air outlet; the power device is arranged at the second vent to drive the atmosphere in the furnace to enter the interlayer from the first vent and then return to the furnace from the second vent to circulate.

8. The precision annealing furnace according to claim 7, characterized in that: The furnace body has a furnace door, the first vent is distributed adjacent to the furnace door, and the second vent is arranged opposite to the furnace door.

9. The precision annealing furnace according to claim 6, characterized in that: The power equipment is a circulating fan.

10. The precision annealing furnace according to claim 6, characterized in that: The air inlet of the dehumidification component is connected to the furnace, and the air outlet is connected to the interlayer.

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