Negative pressure pressure-regulating discharge system

Abstract

The utility model discloses a kind of negative pressure pressure regulating furnace discharge systems, belong to infrared optical glass melting forming's furnace discharge system technical field.The system includes: high temperature furnace, it includes closed furnace shell, heat-insulating refractory structure and heating unit;Negative pressure pressure regulating unit is set on high temperature furnace, and with high temperature furnace inside intercommunication, for making high temperature furnace inside form negative pressure area, and adjust and maintain negative pressure state;Glass melting effluent unit is set in high temperature furnace, including crucible and the discharge pipe of setting in the bottom of crucible, the crucible is used to hold infrared glass liquid.The utility model the furnace discharge system is accurately controlled by high temperature furnace internal pressure, effectively controls the flow rate of glass liquid, ensure its flow steady and uniform, to avoid the violent impact and suction to lower glass liquid due to flow rate too fast, to prevent the generation of linear stripe, crystallization and other defects, significantly improve the optical transmittance of infrared glass, uniformity and mechanical strength.

Description

Technical Field

[0001] This utility model relates to the technical field of furnace tapping systems for infrared optical glass melting and molding, and in particular to a negative pressure regulating furnace tapping system. Background Technology

[0002] Infrared optical glass (hereinafter referred to as infrared glass) is a key material for manufacturing high-end optical devices such as thermal imaging systems, infrared detectors, and lasers. Unlike traditional glasses with SiO2, P2O5, B2O3, and Ge2O3 as network forgings, infrared glass typically uses Ga2O3, Y2O3, Al2O3, and La2O3 as its main components. This compositional variation leads to significantly different physical properties in the molten state, one of the most notable problems being the reduced viscosity of the molten glass. In actual melting production, due to these viscosity characteristics, the flow rate of infrared glass molten glass is extremely high when it exits the furnace, resulting in enormous fluid kinetic energy. This high-speed flowing molten glass, upon entering the forming equipment, violently impacts and entrains the relatively stationary or slow-flowing molten glass below. This results in defects such as linear streaks and crystallization, which severely degrade the optical transmittance, uniformity, and mechanical strength of the infrared glass, causing substandard product performance and ultimately scrapping the entire batch, resulting in significant economic losses for the company.

[0003] Therefore, existing technologies still need to be improved and developed. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a negative pressure regulating furnace discharge system, which aims to solve the problem that the existing infrared glass melt flows at an extremely fast rate when it exits the furnace. When this high-speed flowing glass melt enters the forming equipment, it will cause a violent impact and entrainment on the relatively stationary or low-speed flowing glass melt below, resulting in defects such as linear streaks and crystallization. These defects will seriously degrade the optical transmittance, uniformity and mechanical strength of infrared glass.

[0005] The technical solution of this utility model is as follows: A negative pressure regulating furnace discharge system, comprising: A high-temperature furnace, comprising a sealed furnace shell, a heat-insulating and refractory structure, and a heating unit; A negative pressure regulating unit is installed on the high-temperature furnace and connected to the interior of the high-temperature furnace. It is used to create a negative pressure zone inside the high-temperature furnace and to regulate and maintain the negative pressure state inside the high-temperature furnace. A glass melting and outflow unit is disposed inside the high-temperature furnace. The glass melting and outflow unit includes a crucible and a discharge pipe disposed at the bottom of the crucible. The crucible is used to hold infrared glass melt. The enclosed furnace shell, heat-insulating and refractory structure, heating unit and crucible are arranged coaxially from the outside to the inside.

[0006] Optionally, the heat-insulating refractory structure is heat-insulating refractory bricks, which are closely arranged inside the closed furnace shell.

[0007] Optionally, the heating unit is a heating rod, which is evenly distributed inside the high-temperature furnace.

[0008] Optionally, the crucible is a platinum crucible, and the discharge pipe is a platinum discharge pipe.

[0009] Optionally, the discharge pipe is vertically connected to the center of the bottom of the crucible.

[0010] Optionally, the negative pressure regulating unit consists of a pressure sensor, a flow rate sensor, a control valve, a vacuum pump, and a PLC controller. The PLC controller calculates and controls the pumping speed of the vacuum pump and the opening degree of the control valve based on the data from the pressure sensor and the flow rate sensor, thereby adjusting the pressure inside the high-temperature furnace in real time.

[0011] Beneficial effects: This utility model provides a negative pressure regulating furnace discharge system. By precisely controlling the internal pressure of the high-temperature furnace, the system effectively regulates the flow rate of the molten glass, ensuring that its flow is stable and uniform. This avoids the violent impact and entrainment of the molten glass below caused by excessive flow rate, thereby preventing the generation of defects such as linear streaks and crystallization, and significantly improving the optical transmittance, uniformity and mechanical strength of infrared glass. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a negative pressure regulating furnace discharge system provided by this utility model. Detailed Implementation

[0013] This utility model provides a negative pressure regulating furnace discharge system. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following provides a more detailed description of this utility model. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit this utility model.

[0014] like Figure 1 As shown, the present invention provides a negative pressure regulating furnace discharge system, which includes: A high-temperature furnace, comprising a sealed furnace shell 1, a heat-insulating and refractory structure 2, and a heating unit 3; Negative pressure regulating unit 4 is installed on the high-temperature furnace and connected to the interior of the high-temperature furnace. It is used to create a negative pressure zone inside the high-temperature furnace and to regulate and maintain the negative pressure state inside the high-temperature furnace. A glass melting and outflow unit is provided inside the high-temperature furnace. The glass melting and outflow unit includes a crucible 5 and a discharge pipe 7 provided at the bottom of the crucible 5. The crucible 5 is used to hold infrared glass melt 6. The enclosed furnace shell 1, the heat-insulating and refractory structure 2, the heating unit 3, and the crucible 5 are arranged coaxially from the outside to the inside.

[0015] The negative pressure regulating furnace discharge system provided by this invention can adjust the negative pressure to control the flow rate of infrared molten glass during discharge. By adjusting the negative pressure inside the high-temperature furnace, the infrared molten glass can be kept stable and uniform during discharge, thus avoiding severe impact and entrainment of the infrared molten glass below due to excessive flow rate. This prevents defects such as linear streaks and crystallization, significantly improving the optical transmittance, uniformity, and mechanical strength of the infrared glass. This discharge system is easy to operate, and the introduction of a negative pressure regulation mechanism effectively controls the flow rate of the infrared molten glass, improving the final product performance and yield.

[0016] Specifically, the key improvement of the negative pressure regulating furnace system lies in the inclusion of a negative pressure regulating unit. This unit creates a negative pressure zone inside the high-temperature furnace and regulates and maintains the internal gas pressure. By actively controlling the furnace pressure to a negative state lower than the external atmospheric pressure, the negative pressure environment generates an upward "suction" or "resistance" force on the infrared molten glass flowing out of the discharge pipe. This force balances and cancels out the downward force caused by the molten infrared glass's own gravity. By precisely adjusting the magnitude of the negative pressure, the outflow velocity of the infrared molten glass can be precisely controlled, transforming it from a high-speed, turbulent flow to a low-speed, stable, and uniform flow.

[0017] The negative pressure regulating furnace discharge system provided by this utility model mainly consists of three parts: a high-temperature furnace, a negative pressure regulating unit 4, and a glass melting and discharging unit. These three parts will be described in detail below.

[0018] The high-temperature furnace is the basic structure of the negative pressure regulating furnace discharge system, providing a sealed and well-insulated high-temperature space. The high-temperature furnace is mainly composed of an outer closed furnace shell 1, a heat-insulating and refractory structure 2 tightly installed inside the closed furnace shell 1, and a heating unit 3, with a temperature adjustment range of 0~1500℃.

[0019] In one embodiment, the heat-insulating refractory structure 2 is a heat-insulating refractory brick, which is closely arranged inside the closed furnace shell 1 to form a highly efficient heat insulation barrier, effectively reducing heat loss from the high-temperature furnace and improving energy utilization efficiency. Simultaneously, the heat-insulating refractory brick also possesses excellent high-temperature resistance, capable of withstanding long-term use in high-temperature environments without damage or deformation.

[0020] In one embodiment, the heating unit 3 is a heating rod, which is evenly distributed inside the high-temperature furnace, enabling it to quickly and stably raise the furnace temperature to the required range. Made of high-quality heating materials, it features rapid heating and high thermal efficiency, ensuring that the high-temperature furnace can accurately reach the set temperature under different process requirements and maintain temperature stability during long-term operation, providing a reliable high-temperature environment for processes such as glass melting.

[0021] The glass melting and outflow unit is located inside the high-temperature furnace. The glass melting and outflow unit includes a crucible 5, which is used to hold molten infrared glass liquid 6, and also includes a discharge pipe 7 located at the bottom of the crucible 5.

[0022] In one embodiment, the crucible 5 is a platinum crucible (i.e., the crucible is made of platinum), and the discharge pipe 7 is a platinum discharge pipe (i.e., the discharge pipe is made of platinum). The platinum material ensures that the infrared glass melt is not contaminated during the outflow process. Platinum also has excellent high-temperature resistance; even after prolonged use in high-temperature environments, it maintains stable physical and chemical properties and will not react with the infrared glass melt, thus guaranteeing the quality and purity of the infrared glass melt.

[0023] In one embodiment, the discharge pipe 7 is vertically connected to the center of the bottom of the crucible 5. That is, a discharge pipe is vertically connected to the center of the bottom of the crucible. This design of the discharge pipe allows for better control of the outflow speed and flow rate of the infrared molten glass.

[0024] The negative pressure regulating unit 4 is the key innovation of this invention. Its function is to actively extract gas from inside the high-temperature furnace, making the internal gas pressure lower than the external atmospheric pressure, forming a stable negative pressure zone, and continuously and precisely adjusting the magnitude of the negative pressure according to process requirements. The negative pressure regulating unit 4 can also monitor changes in gas pressure inside the high-temperature furnace in real time and respond quickly to ensure the stability of the negative pressure state. Its adjustment range is wide, which can meet the diverse negative pressure requirements of different process stages.

[0025] In one embodiment, the negative pressure regulating unit 4 is a system component for regulating and maintaining the negative pressure state inside a high-temperature furnace, consisting of a pressure sensor, a flow rate sensor, a control valve, a vacuum pump, and a PLC controller. Its working principle is as follows: the PLC controller receives data from the pressure sensor (detecting the negative pressure value inside the furnace) and the flow rate sensor (monitoring the flow rate of the molten glass), calculates and controls the pumping speed of the vacuum pump and the opening degree of the control valve through a preset program, and adjusts the furnace pressure in real time to solve the problems of impact and entrainment defects caused by excessively high flow rates when the infrared molten glass exits the furnace.

[0026] In summary, the working principle of the negative pressure regulating unit includes the following points: Negative pressure formation: By actively extracting the gas inside the high-temperature furnace, the gas pressure inside the furnace is lower than the external atmospheric pressure, thus forming a stable negative pressure zone.

[0027] Flow rate control: The negative pressure environment generates an upward resistance force on the infrared glass liquid flowing out of the discharge pipe, which balances with the gravity of the infrared glass liquid itself, thereby controlling its outflow rate.

[0028] Precise adjustment: The negative pressure is precisely controlled by the adjustment unit, enabling continuous and precise regulation of the infrared glass melt flow rate.

[0029] Stable maintenance: By monitoring changes in gas pressure inside the furnace in real time and responding quickly, the negative pressure state is kept stable, ensuring smooth and uniform flow of infrared molten glass.

[0030] By combining air pressure difference with mechanical balance, the problem of excessively fast flow rate caused by low viscosity of infrared glass melt is solved, thus avoiding molding defects.

[0031] In one specific embodiment, the negative pressure regulating furnace system includes a high-temperature furnace. The high-temperature furnace comprises a sealed furnace shell, heat-insulating refractory bricks tightly arranged inside the sealed furnace shell, and heating rods evenly distributed inside the furnace, providing a sealed and controllable high-temperature environment. Inside the high-temperature furnace is a glass melting and outflow unit, including a platinum crucible for holding molten infrared glass, and a platinum outlet pipe vertically connected to the center of the bottom of the platinum crucible. The infrared glass flows out through this outlet pipe for forming. The core improvement lies in the inclusion of a negative pressure regulating unit on the high-temperature furnace, connected to the interior of the furnace, used to create a negative pressure zone inside the furnace and to regulate and maintain the negative pressure state inside the furnace.

[0032] This system effectively regulates the flow rate of molten glass by precisely controlling the internal pressure of the high-temperature furnace, ensuring its smooth and uniform flow. This avoids the violent impact and entrainment of the molten glass below caused by excessive flow rate, thereby preventing defects such as linear streaks and crystallization, and significantly improving the optical transmittance, uniformity and mechanical strength of infrared glass.

[0033] In summary, this utility model provides a negative pressure regulating furnace discharge system. The system includes: a high-temperature furnace comprising a sealed furnace shell, a heat-insulating refractory structure, and a heating unit; a negative pressure regulating unit, installed on the high-temperature furnace and connected to its interior, used to create a negative pressure zone inside the furnace and to regulate and maintain the negative pressure state; and a glass melting discharge unit, installed inside the high-temperature furnace, including a crucible and a discharge pipe located at the bottom of the crucible, the crucible being used to hold infrared glass melt. This discharge system, by precisely controlling the internal pressure of the high-temperature furnace, effectively regulates the flow rate of the glass melt, ensuring its smooth and uniform flow. This avoids severe impact and entrainment of the glass melt below due to excessive flow rate, thereby preventing defects such as linear streaks and crystallization, and significantly improving the optical transmittance, uniformity, and mechanical strength of the infrared glass.

[0034] It should be understood that the application of this utility model is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A negative pressure regulating furnace discharge system, characterized in that, include: A high-temperature furnace, comprising a sealed furnace shell, a heat-insulating and refractory structure, and a heating unit; A negative pressure regulating unit is installed on the high-temperature furnace and connected to the interior of the high-temperature furnace. It is used to create a negative pressure zone inside the high-temperature furnace and to regulate and maintain the negative pressure state inside the high-temperature furnace. A glass melting and outflow unit is disposed inside the high-temperature furnace. The glass melting and outflow unit includes a crucible and a discharge pipe disposed at the bottom of the crucible. The crucible is used to hold infrared glass melt. The enclosed furnace shell, heat-insulating and refractory structure, heating unit and crucible are arranged coaxially from the outside to the inside.

2. The negative pressure regulating furnace discharge system according to claim 1, characterized in that, The heat-insulating and refractory structure is heat-insulating refractory bricks, which are closely arranged inside the closed furnace shell.

3. The negative pressure regulating furnace discharge system according to claim 1, characterized in that, The heating unit is a heating rod, which is evenly distributed inside the high-temperature furnace.

4. The negative pressure regulating furnace discharge system according to claim 1, characterized in that, The crucible is a platinum crucible, and the discharge pipe is a platinum discharge pipe.

5. The negative pressure regulating furnace discharge system according to claim 1, characterized in that, The discharge pipe is vertically connected to the center of the bottom of the crucible.

6. The negative pressure regulating furnace discharge system according to claim 1, characterized in that, The negative pressure regulating unit consists of a pressure sensor, a flow rate sensor, a control valve, a vacuum pump, and a PLC controller. The PLC controller calculates and controls the pumping speed of the vacuum pump and the opening degree of the control valve based on the data from the pressure sensor and the flow rate sensor, thereby adjusting the pressure inside the high-temperature furnace in real time.

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