A quartz rod melting burner with uniform flame

Abstract

The utility model relates to a quartz rod melting combustor that sprays fire uniformly, which can realize the purpose that the flames sprayed by each flame spraying port are uniform and consistent. It comprises a shell, the shell is in the shape of a long strip, the shell has an inner cavity, the two ends of the length direction of the shell are provided with air inlets, one end of the air inlet is communicated with a fuel mixture supply pipeline, the other end is communicated with the inner cavity, the shell is provided with at least one row of multiple air flow channels for spraying fuel mixture along the length direction of the shell, the air flow channels are arranged at intervals, the air flow channel comprises an inner port communicated with the inner cavity and an outer port extending to the outside of the shell, the outer ports of the air flow channels are on the same straight line parallel to the outer surface of the shell, each air flow channel is divided into a middle section and edge sections symmetrically arranged on both sides of the middle section according to the actual pressure of the corresponding fuel mixture, the lengths of the air flow channels in the middle section are the same, the lengths of the air flow channels in the edge sections decrease from the center of the shell to both sides, so that the lengths of the flames sprayed by each outer port are consistent.

Description

Technical Field

[0001] This utility model relates to the technical field of quartz fiber drawing equipment, specifically to a quartz rod melting burner with uniform flame spray. Background Technology

[0002] In the rod drawing method for producing quartz glass fibers, quartz glass rods with a diameter of approximately 1.8 to 4 millimeters are heated and melted. To achieve high drawing efficiency, 50-100 quartz rods are drawn at a time. Each quartz rod simultaneously passes through the corresponding flame nozzle of a melting burner, where it is melted by the flame and then drawn into quartz fiber filaments. Because the temperature varies across different areas of the flame, if the flames emitted from each nozzle are different, it will directly affect the molten quartz rods, resulting in inconsistent melting effects and unstable subsequent drawing quality, thus impacting the quality of the finished filaments.

[0003] Existing melting burners typically have two rows of flame nozzles, with 50 nozzles in each row. Fuel is usually introduced from the middle or both sides. For burners with side-intake, the high-speed airflow during fuel intake causes inconsistent pressure throughout the burner, especially at the ends where the pressure is often lower than in the middle. This results in substandard flames from the nozzles near the sides, failing to guarantee the melting quality of the quartz rod. For burners with center-intake, the airflow is even more complex, exhibiting a pressure decrease-stabilize-decrease process from the middle to the ends. Furthermore, the high temperature of the flames from the nozzles heats the air in the flame area, creating high-speed air convection nearby, which also affects the flame size and thus the melting effect on the quartz rod. Summary of the Invention

[0004] The purpose of this invention is to provide a quartz rod melting burner with uniform flame spray. By testing the pressure changes at each flame nozzle of the burner, the length of the airflow channel corresponding to the flame nozzle is changed accordingly to achieve uniform flame spray from each flame nozzle.

[0005] The first technical solution of the uniformly flame-spraying quartz rod melting burner of this utility model is as follows: The uniformly flame-spraying quartz rod melting burner includes a shell, which is elongated and has an inner cavity. Air inlets are provided at both ends along the length of the shell. One end of the air inlet is connected to a fuel-gas supply pipe, and the other end is connected to the inner cavity. At least one row of multiple airflow channels for ejecting the fuel-gas mixture is provided along the length of the shell. Each airflow channel includes an inner opening connected to the inner cavity and an outer opening extending outside the shell. The outer openings of each airflow channel are on the same straight line parallel to the outer surface of the shell. Each airflow channel is divided into a middle section and symmetrically arranged edge sections on both sides of the middle section according to the actual pressure of the corresponding fuel-gas mixture. The lengths of the airflow channels in the middle section are the same, and the lengths of the airflow channels in the edge sections decrease from the center of the shell to both sides, so that the length of the flame ejected from each outer opening is consistent.

[0006] The beneficial effects of this technical solution are as follows: During use, since the casing has air intakes at both ends, and to achieve a "hard flame" of a certain length ejected from the airflow channel, the gas pressure of the fuel mixture must reach a certain value. Therefore, the fuel mixture flows very quickly under high pressure, especially when it enters the intake port. Because the intake port diameter is small, smaller than the cross-section of the casing, the flow velocity near the intake port is very high. Due to the Bernoulli effect, a negative pressure zone is generated in a certain area near the intake port. As the gas flows within the casing, because the casing volume is larger than the fuel mixture supply pipe, the gas flow velocity slows down and becomes stable in that area. Therefore, the gas pressure in the middle region of the casing is stable. This application, through studying the relationship between the above gas pressure and the flame in the airflow channel, improves the casing... The multiple airflow channels on the body are divided into a middle section and two symmetrical edge sections according to the air pressure at their corresponding locations. In the middle section, the air pressure is stable, so the length of each airflow channel is the same. In the edge sections, the gas flow rate is faster and the air pressure is lower as it gets closer to the air inlet. The flames ejected from the corresponding airflow channels are shorter, so the length of the corresponding airflow channels needs to be set shorter. The shorter the airflow channels, the less resistance to airflow. This results in a structure in which the length of each airflow channel in the edge section gradually decreases from near the middle section to far away from the middle section. This is to compensate for the impact of air pressure changes in the edge section on the flame. Through compensation, the flames ejected from the airflow channels in all parts of the shell can be made as consistent in length as possible, thereby ensuring the melting effect and quality stability of the corresponding quartz rod and ensuring the stability of wire drawing.

[0007] Based on the above solution, further improvements are made as follows: the airflow channel is formed by the inner hole of the airflow pipe installed on the shell, and the length of each airflow pipe is not less than the wall thickness of the shell. This solution facilitates the disassembly and replacement of the airflow channel, such as replacement and repair when damaged by long-term high-temperature ablation, or adjustment of the length of the airflow channel according to changes in air pressure. This solution is quite convenient.

[0008] Based on the above solution, a further improvement is made as follows: the airflow channel is formed by drilling holes in the side wall of the shell, and the thickness of the side wall is consistent with the length of the corresponding airflow channel. This solution can improve the processing efficiency of the molten burner, as it only requires drilling holes in the side wall with the adjusted thickness.

[0009] Based on the above scheme, a further improvement is made as follows: the airflow channels are symmetrically arranged on two opposite surfaces of the shell. This arrangement allows for the melting of two rows of quartz rods at once, and more importantly, it utilizes the symmetry of the airflow channels to balance the pressure of the fuel mixture within the shell as much as possible, thereby ensuring the consistency of the jet flow from each airflow channel.

[0010] Based on the above scheme, the following improvements are made: the number of airflow channels corresponding to the edge segment accounts for 20%-40% of the total number of airflow channels.

[0011] Based on the above scheme, further improvements are made as follows: the airflow channels are set at equal intervals. This not only accommodates equally spaced quartz rods but also helps to balance the airflow pressure inside the shell.

[0012] Based on the above scheme, the following improvements are made: the diameter of each airflow channel is the same. Attached Figure Description

[0013] Figure 1 This is a top sectional view of Embodiment 1 of the present invention, which is a uniformly flamed quartz rod melting burner. Figure 2 for Figure 1 A magnified view of a section at point A in the middle; Figure 3 This is a top sectional view of Embodiment 2 of the present invention, which is a uniformly flamed quartz rod melting burner. Figure 4 for Figure 3 A magnified view of a section at point B in the middle; In the diagram: 1-shell, 11-inner cavity, 12-side wall, 2-supply pipe for fuel mixture, 3-airflow channel, 31-inner port, 32-outer port, 4-edge section, 5-middle section, 6-airflow pipe. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0015] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0016] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0017] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0018] Example 1 of a uniformly flame-spraying quartz rod melting burner of this utility model: Figure 1-2 As shown, the melting burner is used as a melting burner for quartz rods in the production of quartz fibers by rod drawing. Each airflow channel 3 corresponds to one quartz rod to be melted. It mainly includes a shell 1, a fuel mixture supply pipe 2, and an airflow channel 3.

[0019] The shell 1 is elongated, such as a rectangular hollow structure with a large length-to-width ratio. Air inlets are located at both ends along its length, connected to a fuel-mixture supply pipe 2. The fuel-mixture can be a mixture of hydrogen and oxygen. The shell 1 has two rows of 50 airflow channels 3 spaced apart along its length. The shell 1 includes an inner cavity 11 and side walls 12. The airflow channels 3 are located on the side walls 12 and include an inner opening 31 communicating with the inner cavity 11 and an outer opening 32 extending outside the shell 1. The outer openings 32 of each airflow channel 3 are on the same straight line parallel to the outer surface of the shell 1. Each row of airflow channels 3 is divided into a middle section 55 and symmetrically arranged edge sections 4 on both sides of the middle section 55 according to the actual pressure of the corresponding fuel-mixture. The lengths of the airflow channels 3 in the middle section 5 are the same, while the lengths of the airflow channels 3 in the edge sections 4 decrease from the center of the shell 1 towards both sides, so that the length of the flame ejected from each outer opening 32 is consistent. Figure 1-2 As shown, the airflow channel 3 is formed by the inner hole of the airflow pipe 6 installed on the housing 1, and the length of each airflow pipe 6 is not less than the wall thickness of the housing 1. This design facilitates the disassembly and replacement of the airflow channel 3, such as replacement and repair when it is damaged by long-term high-temperature ablation, or adjustment of the length of the airflow channel 3 according to changes in air pressure. This design is quite convenient.

[0020] In other embodiments, such as Figure 3-4 As shown, the airflow channel 3 is formed by drilling holes in the side wall 12 of the housing 1, and the thickness of the side wall 12 is consistent with the length of the corresponding airflow channel 3. This design can improve the processing efficiency of the molten burner, as it only requires drilling holes in the side wall 12 with the adjusted thickness.

[0021] The airflow channels 3 are symmetrically arranged on two opposite surfaces of the shell 1. This arrangement allows for the melting of two rows of quartz rods at once, and more importantly, utilizes the symmetry of the airflow channels 3 to balance the pressure of the fuel mixture within the shell 1, thereby ensuring the consistency of the airflow from each airflow channel 3. The number of airflow channels 3 corresponding to the edge segment 4 accounts for 20%-40% of the total number of airflow channels 3. The airflow channels 3 are evenly spaced. This arrangement accommodates the evenly spaced quartz rods and also helps to balance the airflow pressure within the shell 1. All airflow channels 3 have the same diameter.

[0022] In use, since the casing 1 has air intakes at both ends, and in order to achieve a "hard flame" with a certain length ejected from the airflow channel 3, the gas pressure of the fuel mixture must reach a certain value. Therefore, the fuel mixture flows very fast under high pressure, especially when it enters the air intake. Because the diameter of the air intake is small, smaller than the cross-section of the casing 1, the flow velocity near the air intake is very fast. Due to the Bernoulli effect, a negative pressure zone will be generated in a certain area near the air intake. As the gas flows inside the casing 1, because the volume of the casing 1 is larger than the fuel mixture supply pipe 2, the gas flow velocity slows down and becomes stable in a certain area. Therefore, the gas pressure in the middle area of ​​the casing 1 is stable. This application studies the relationship between the above gas pressure and the flame of the airflow channel 3, and designs multiple airflow channels on the casing 1. 3. Based on the corresponding air pressure, the section is divided into a middle section 5 and two symmetrical edge sections 4. In the middle section 5, the air pressure is stable, so the length of each airflow channel 3 is the same. In the edge section 4, the gas flow rate is faster and the air pressure is lower as it gets closer to the air inlet. Therefore, the flames ejected from the corresponding airflow channels 3 are shorter, and the length of the corresponding airflow channels 3 needs to be set shorter. The shorter the airflow channels 3, the less resistance to the airflow. This results in a structure in which the length of each airflow channel 3 in the edge section 4 gradually decreases from the middle section 5 to the distance from the middle section 5. This is to compensate for the influence of the air pressure change in the edge section 4 on the flame. Through compensation, the flames ejected from each airflow channel 3 in the shell 1 can be made as consistent in length as possible, thereby ensuring the melting effect and quality stability of the corresponding quartz rod and ensuring the stability of the wire drawing.

[0023] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. A uniformly flame-spraying quartz rod melting burner, comprising a shell, the shell being elongated and having an inner cavity, with air inlets at both ends along its length, one end of the air inlet communicating with a fuel-gas mixture supply pipe and the other end communicating with the inner cavity, the shell having at least one row of multiple airflow channels spaced apart from each other along its length for ejecting the fuel-gas mixture, each airflow channel including an inner opening communicating with the inner cavity and an outer opening extending outside the shell, the outer openings of each airflow channel being on the same straight line parallel to the outer surface of the shell, characterized in that, Each airflow channel is divided into a middle section and an edge section symmetrically located on both sides of the middle section according to the actual pressure of the corresponding fuel mixture. The length of each airflow channel in the middle section is the same, and the length of each airflow channel in the edge section decreases from the center of the shell to both sides, so that the length of the flames ejected from each external opening is consistent.

2. The uniformly flamed quartz rod melting burner according to claim 1, characterized in that, The airflow channel is formed by the inner hole of the airflow pipe installed on the shell, and the length of each airflow pipe is not less than the wall thickness of the shell.

3. The uniformly flamed quartz rod melting burner according to claim 1, characterized in that, The airflow channel is formed by drilled holes in the side wall of the shell, and the thickness of the side wall is consistent with the length of the corresponding airflow channel.

4. The uniformly flamed quartz rod melting burner according to claim 1, characterized in that, The airflow channels are symmetrically arranged on two opposite surfaces of the casing.

5. The uniformly flamed quartz rod melting burner according to claim 1, characterized in that, The number of airflow channels corresponding to the edge segment accounts for 20%-40% of the total number of airflow channels.

6. The uniformly flamed quartz rod melting burner according to claim 1, characterized in that, Each airflow channel is set at equal intervals.

7. The uniformly flamed quartz rod melting burner according to claim 1, characterized in that, All airflow channels have the same diameter.

Images