Device for improving plasma jet carrier gas vorticity, ionization system and flame moment generation method

Abstract

The invention discloses a device for improving plasma jet carrier gas vorticity, an ionization system and a flame moment generation method. The device comprises a rotational flow box body, a rotational flow structure and a gas inlet structure, a containing cavity with an opening is formed in the rotational flow box body, and the top opening of the rotational flow box body is used for arranging a discharge tube; the air inlet structure comprises an air inlet assembly which is arranged at the bottom of the rotational flow box body and is communicated with the accommodating cavity of the rotational flow box body, and a long air pipe which extends to the top opening of the rotational flow box body from the bottom of the rotational flow box body along the central axis of the rotational flow box body; the rotational flow structure is arranged in the containing cavity and arranged on the circumferential side of the pipe wall of the long air pipe, and the rotational flow structure is used for enabling air in the containing cavity to generate air rotational flow. Therefore, the unfavorable phenomena that the plasma torch is unstable, the combustion efficiency is low, and chemical substances are formed at a pipe orifice and the like due to the fact that the gas is in a steady state when the gas required by the plasma torch is ignited are solved.

Description

Technical Field

[0001] The invention relates to the field of optical fiber and optoelectronic technology, and in particular to a device for improving the vorticity of plasma jet carrier gas, an ionization system and a flame moment generation method. Background Art

[0002] In the process of preparing F-SiO2 optical fiber preform, electromagnetic waves need to ionize with the required gas to generate a plasma torch, and then the plasma torch is sprayed onto the preform cladding to deposit F-SiO2. In the process of generating a plasma torch, since most of the current reaction gases and carrier gases form vortices through oblique air intake, the vortex intensity formed in this way is low. After a certain distance, the gas forms a steady state, and the gas flow rate and vorticity are reduced. At the same time, the vortex formed cannot mix the gas evenly, which will prevent the plasma torch from forming a steady state, resulting in incomplete combustion and low combustion efficiency. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned background technology and to provide a device for improving the vorticity of plasma jet carrier gas, an ionization system and a flame torque generation method, which solves the problem that when the gas required by the plasma torch is ignited, the gas has already formed a steady state, causing the plasma torch to be unstable and the combustion efficiency to be low, and at the same time, chemical substances are formed at the nozzle.

[0004] In a first aspect, a device for improving the vorticity of a plasma jet carrier gas is provided, comprising:

[0005] A cyclone box body, wherein an open accommodating cavity is formed in the cyclone box body, and a discharge tube is arranged at the open top of the cyclone box body;

[0006] An air intake structure, comprising an air intake assembly disposed at the bottom of the cyclone box and communicating with the containing cavity of the cyclone box, and a long air pipe extending from the bottom of the cyclone box along the central axis of the cyclone box to the top opening of the cyclone box; and,

[0007] The swirl structure is arranged inside the accommodating cavity and on the peripheral side of the tube wall of the long gas tube. The swirl structure is used to generate a gas swirl in the gas in the accommodating cavity.

[0008] In some embodiments, the swirl structure includes a plurality of spiral blades protruding from the circumference of the tube wall of the long air tube and arranged at equal intervals.

[0009] In some embodiments, the tips of the plurality of spiral blades are pressed against the inner wall of the swirl box.

[0010] In some embodiments, the inner diameter of the box at the top of the cyclone box gradually decreases from bottom to top.

[0011] In some embodiments, the air intake assembly includes a plurality of short air pipes disposed at the bottom of the cyclone box and distributed in a ring shape with the long air pipe as the center, and the plurality of short air pipes are connected to the accommodating cavity of the cyclone box.

[0012] In some embodiments, the cyclone box, the long air pipe and the short air pipe are all configured as cylindrical structures.

[0013] In some embodiments, the calculation formula of the diameter D of the spiral blade is as follows:

[0014] D = [(Q / πv)*m]^0.5;

[0015] The calculation formula of the helical angle tanβ of the spiral blade is as follows:

[0016] tanβ=[(π*D) / p]*[1 / 2(1+m^2)]^0.5;

[0017] The calculation formula for the pitch p between two adjacent spiral blades is as follows:

[0018] p = π*Dtanβ;

[0019] Where Q is the design flow rate of the spiral blade; v is the gas velocity transported by the spiral blade; and m is the correction coefficient.

[0020] In a second aspect, an ionization system is provided, comprising:

[0021] The device for improving the vorticity of a plasma jet carrier gas as described above; and a discharge tube, which is arranged at the top opening of a mixing flow box in the device for improving the vorticity of a plasma jet carrier gas.

[0022] In a third aspect, a flame moment generation method is provided, which specifically comprises the following steps:

[0023] A quartz tube is placed at the top opening of the device for improving the vorticity of the plasma jet carrier gas as described above, and the quartz tube is arranged in the resonance cavity;

[0024] Introducing reaction gas into the air inlet structure of the device for increasing the vorticity of plasma jet carrier gas;

[0025] The magnetron device is started to ionize the reaction gas reaching the quartz tube to generate plasma, and the ignition device is started to ignite the plasma to generate a plasma flame.

[0026] Compared with the prior art, the present invention is provided with a swirl structure. When auxiliary gases such as argon and nitrogen and other mixed raw materials are introduced into the air intake component, a swirl is generated due to the gas's own pressure passing through the swirl structure. At the same time, silicon tetrachloride SiCl4 is introduced into the long gas pipe, so that the gas entering the containing cavity of the swirl box through the air intake component can be evenly mixed and forms a vortex to flow into the top opening of the swirl box, thereby ensuring that the gas required for generating a plasma torch has a relatively high speed, and then the discharge tube reacts with the airflow at the top opening of the swirl box to generate a plasma torch. Therefore, the present invention can improve the vortex, mixing degree and speed of the gas reacting with the discharge tube, thereby improving the stability and combustion degree of the plasma torch and reducing the accumulation of chemical substances at the tube mouth. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of a device for improving the vorticity of a plasma jet carrier gas according to the present invention;

[0028] Figure 2 It is a schematic cross-sectional structure diagram of a device for improving the vorticity of a plasma jet carrier gas according to the present invention from one viewing angle;

[0029] Figure 3 It is a schematic cross-sectional structure diagram of another viewing angle of the device for improving the vorticity of the plasma jet carrier gas of the present invention;

[0030] Figure 4 is a gas flow diagram of the present invention;

[0031] Figure 5 It is a gas vortex size diagram of the present invention;

[0032] Figure 6 It is the gas velocity magnitude diagram of the present invention;

[0033] Figure 7 It is a flow chart of the flame moment generating method of the present invention.

[0034] 10. Cyclone box; 20. Long air pipe; 30. Spiral blade; 40. Short air pipe. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] See also Figure 1 , 2As shown in Figure 3, an embodiment of the present invention provides a device for improving the vorticity of a plasma jet carrier gas, comprising a swirl box 10, a swirl structure and an air intake structure; an open containing cavity is formed in the swirl box 10, and the top open part of the swirl box 10 is used to set a discharge tube; the air intake structure comprises an air intake assembly arranged at the bottom of the swirl box 10 and connected to the containing cavity of the swirl box 10, and a long air pipe 20 extending from the bottom of the swirl box 10 and along the central axis of the swirl box 10 to the top open part of the swirl box 10; the swirl structure is arranged inside the containing cavity and on the peripheral side of the tube wall of the long air pipe 20, and the swirl structure is used to make the gas in the containing cavity generate a gas swirl.

[0037] Specifically, in this embodiment, in the existing field of preparing F-SiO2 optical fiber preform rods, a vortex is generally formed by oblique air intake, but the vortex intensity formed by this method is low. After passing a certain distance, the gas forms a steady state, and the gas flow rate and vorticity are reduced. At the same time, the vortex formed cannot mix the gas evenly, which will make the plasma torch unable to form a steady state, resulting in incomplete combustion and low combustion efficiency. Therefore, in view of this situation, the present invention sets a swirl structure. When auxiliary gases such as argon and nitrogen and other mixed raw materials are introduced into the air intake component, a swirl is generated due to the gas's own pressure passing through the swirl structure. At the same time, silicon tetrachloride SiCl4 is introduced into the long gas pipe, so that the gas entering the containing cavity of the swirl box 10 through the air intake component can be evenly mixed, and forms a vortex to flow into the top opening of the swirl box 10, thereby ensuring that the gas required to generate the plasma torch has a higher speed, and then reacts with the gas flow at the top opening of the swirl box 10 through the discharge tube to generate the plasma torch. Therefore, the present invention can improve the vortex, mixing degree and speed of the gas reacting with the discharge tube, thereby improving the stability and combustion degree of the plasma torch and reducing the accumulation of chemical substances at the tube mouth.

[0038] Optionally, the swirl structure includes a plurality of spiral blades 30 protruding from the circumferential side of the tube wall of the long air tube 20 and arranged at equal intervals.

[0039] Optionally, the ends of the plurality of spiral blades 20 are all pressed against the inner wall of the swirl box 10. It can be understood that the spiral blades 20 and the inner wall of the swirl box 10 are fixed by welding.

[0040] Specifically, in this embodiment, since the gas pressure itself passes through multiple spiral blades 30 to generate a swirl, the gas entering the containing cavity can be mixed evenly, which can ensure that the gas required to generate the plasma torch has a higher speed, thereby improving the stability and combustion degree of the plasma torch and reducing the accumulation of chemical substances at the pipe mouth.

[0041] Optionally, the calculation formula of the diameter D of the spiral blade 30 is as follows:

[0042] D = [(Q / πv)*m]^0.5;

[0043] The calculation formula of the helical angle tanβ of the helical blade 30 is as follows:

[0044] tanβ=[(π*D) / p]*[1 / 2(1+m^2)]^0.5;

[0045] The calculation formula of the pitch p between two adjacent spiral blades 30 is as follows:

[0046] p = π*Dtanβ;

[0047] In the formula, Q is the design flow rate of the spiral blade 30; v is the gas velocity transported by the spiral blade 30; and m is the correction coefficient.

[0048] Specifically, in this embodiment, the blade diameter refers to the length of the blade measured in a straight line; the helix angle refers to the inclination angle of the blade on the dividing cylinder; and the pitch is the distance around the axis between two adjacent blades.

[0049] Generally, the larger the helix angle of the blade, the higher its efficiency, because the increase in the helix angle can make the blade better use of fluid kinetic energy and increase flow and pressure. However, too large a helix angle will also increase the resistance of the blade and affect the performance of the blade. Generally speaking, the helix angle of the blade is set between 20 degrees and 45 degrees to increase the vortex and mixing degree of the reaction gas and carrier gas.

[0050] Optionally, the inner diameter of the box at the top of the cyclone box 10 gradually decreases from bottom to top.

[0051] Specifically, in this embodiment, since the top of the swirl box 10 adopts a constriction structure, according to the Bernoulli principle, the sum of the kinetic energy, potential energy and pressure potential energy of a unit volume of fluid is a constant, so when the gas pressure decreases, the gas flow rate will increase, and the gas at the constriction structure is released due to the gas pressure at the constriction, and the pressure is reduced, so that the gas flow rate is accelerated, and the vorticity, mixing degree and speed of the gas output to the open top of the swirl box 10 are improved. Therefore, due to the constriction at the top of the current limiting box, the gas flow rate is further accelerated, which can ensure that the gas has a relatively high speed when it reaches the plasma torch.

[0052] Optionally, the air intake assembly includes a plurality of short air pipes 40 disposed at the bottom of the cyclone box 10 and distributed in a ring shape with the long air pipe 20 as the center, and the plurality of short air pipes 40 are connected to the receiving cavity of the cyclone box 10. The short air pipes 40 and the cyclone box 10 are connected by high frequency welding.

[0053] Optionally, the swirl box 10, the long air pipe 20 and the short air pipe 40 are all configured as cylindrical structures.

[0054] An embodiment of the present invention further provides an ionization system, comprising: the device for improving the vorticity of a plasma jet carrier gas and a discharge tube as described above; the discharge tube is arranged at the top opening of a mixing flow box in the device for improving the vorticity of a plasma jet carrier gas.

[0055] See also Figure 4 , 5 As shown in Figure 6, when the gas is introduced into the containing cavity of the swirl box and gathered, it passes through multiple spiral blades to make the gas evenly mixed and form a vortex to flow into the top of the swirl box. Due to the shrinkage at the top of the swirl box, the flow rate of the gas is further accelerated, thereby ensuring that the gas still has a relatively high speed when it reaches the plasma torch.

[0056] See also Figure 7 As shown, the embodiment of the present invention also provides a flame moment generation method, which specifically includes the following steps:

[0057] A quartz tube is placed at the top opening of the device for improving the vorticity of the plasma jet carrier gas as described above, and the quartz tube is arranged in the resonance cavity;

[0058] Introducing reaction gas into the air inlet structure of the device for increasing the vorticity of plasma jet carrier gas;

[0059] The magnetron device is started to ionize the reaction gas reaching the quartz tube to generate plasma, and the ignition device is started to ignite the plasma to generate a plasma flame.

[0060] Specifically, in this embodiment, the device is first connected to other structures related to generating flame moment. First, the bottom of the device is connected to each raw gas and auxiliary gas gas pipe respectively, and a quartz discharge tube of suitable size is inserted into the top opening. At the same time, the quartz discharge tube passes through the resonant cavity, and the three are fixed. First, the required gas and raw material valves are opened, and they are allowed to pass through the device for increasing the vorticity of the plasma jet carrier gas to increase the gas mixing degree, vorticity and flow rate, and then the magnetron and power supply are turned on to generate electromagnetic waves to ionize the gas passing through the discharge tube into plasma, and manually ignite to generate a plasma flame moment.

[0061] In the description of the present invention, it should be noted that the terms "upper", "lower", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0062] It should be noted that, in the present invention, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0063] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features invented herein.

Claims

1. A device for increasing the vorticity of a plasma jet carrier gas, characterized in that: include: A cyclone box body, wherein an open accommodating cavity is formed in the cyclone box body, and a discharge tube is arranged at the open top of the cyclone box body; An air intake structure, comprising an air intake assembly disposed at the bottom of the cyclone box and connected to the containing cavity of the cyclone box, and a long air pipe extending from the bottom of the cyclone box along the central axis of the cyclone box to the top opening of the cyclone box; as well as, The swirl structure is arranged inside the accommodating cavity and on the peripheral side of the tube wall of the long gas tube. The swirl structure is used to generate a gas swirl in the gas in the accommodating cavity.

2. The device for increasing the vorticity of a plasma jet carrier gas according to claim 1, characterized in that: The swirl structure includes a plurality of spiral blades protruding from the peripheral side of the tube wall of the long air tube and arranged at equal intervals.

3. The device for increasing the vorticity of a plasma jet carrier gas according to claim 2, characterized in that: The ends of the plurality of spiral blades are tightly pressed against the inner wall of the swirl box.

4. The device for increasing the vorticity of a plasma jet carrier gas according to claim 1, characterized in that: The inner diameter of the box located at the top of the cyclone box gradually decreases from bottom to top.

5. The device for increasing the vorticity of a plasma jet carrier gas according to claim 2, characterized in that: The air intake assembly includes a plurality of short air pipes which are arranged at the bottom of the cyclone box and are distributed in a ring shape with the long air pipe as the center. The plurality of short air pipes are connected to the accommodating cavity of the cyclone box.

6. The device for increasing the vorticity of a plasma jet carrier gas according to claim 5, characterized in that: The swirl box, the long air pipe and the short air pipe are all configured as cylindrical structures.

7. The device for increasing the vorticity of a plasma jet carrier gas according to claim 2, characterized in that: The calculation formula of the diameter D of the spiral blade is as follows: D = [(Q / πv)*m]^0.5; The calculation formula of the helical angle tanβ of the spiral blade is as follows: tanβ=[(π*D) / p]*[1 / 2(1+m^2)]^0.5; The calculation formula for the pitch p between two adjacent spiral blades is as follows: p = π*Dtanβ; Where Q is the design flow rate of the spiral blade; v is the gas velocity transported by the spiral blade; and m is the correction coefficient.

8. An ionization system, characterized in that: include: A device for increasing the vorticity of a plasma jet carrier gas as claimed in any one of claims 1 to 7; as well as, The discharge tube is arranged at the top opening of the mixed flow box in the device for improving the vorticity of the plasma jet carrier gas.

9. A flame moment generation method, characterized in that: The specific steps include: A quartz tube is placed at the top opening of the device for improving the vorticity of the plasma jet carrier gas as claimed in any one of claims 1 to 7, and the quartz tube is arranged in the resonant cavity; Introducing reaction gas into the air inlet structure of the device for increasing the vorticity of plasma jet carrier gas; The magnetron device is started to ionize the reaction gas reaching the quartz tube to generate plasma, and the ignition device is started to ignite the plasma to generate a plasma flame.

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