CN212469084U

CN212469084U - VAD blowtorch cleaning device

Info

Publication number: CN212469084U
Application number: CN202020416412.4U
Authority: CN
Inventors: 沈小平; 王兵钦; 何炳; 范忠阔; 胡君豪; 谢晓寒; 卢鑫欣; 田佳
Original assignee: Tongding Interconnection Information Co Ltd
Current assignee: Tongding Interconnection Information Co Ltd
Priority date: 2020-03-27
Filing date: 2020-03-27
Publication date: 2021-02-05
Anticipated expiration: 2030-03-27

Abstract

The utility model discloses a VAD blowtorch cleaning device, the device is including cleaning the gas supply cabinet, cleaning the gas supply cabinet and being responsible for and branch pipe, control computer, PLC controller, soft exhaust pipe, automatic valve, float flowmeter, blowtorch intake pipe of leading, through realizing the inside each layer space of VAD blowtorch in time high-efficiently clearance operation with the help of auxiliary assembly such as PLC controller control automatic valve clearance switching and lead the blast pipe, through the inside each layer space of flow control accurately ground cleaning blowtorch. In the blowtorch clearance process, sweep the inside and outside great pressure difference of combination deposit cavity exhaust column formation blowtorch with the outside powder impurity synchronous suction blowtorch with the help of high-pressure gas, get into waste gas recovery portion, the utility model discloses the device greatly slows down quartz blowtorch inlayer scale deposit speed, reduces the risk that bubble, optical parameter worsen appear in the prefabricated stick plug of optic fibre, prolongs blowtorch life, has improved production efficiency greatly.

Description

VAD blowtorch cleaning device

Technical Field

The invention belongs to the field of manufacturing of optical fiber preforms, and particularly relates to a VAD blowtorch cleaning device and a VAD blowtorch cleaning method.

Background

In the existing optical fiber preform preparation process, a core rod is mostly produced by adopting an axial vapor deposition method (VAD), and an outer cladding layer is produced by adopting an outer vapor deposition method (OVD) to produce the optical fiber preform by a two-step method. The equipment for producing the core rod by the VAD method mainly comprises a reaction cavity, a spray lamp group, a raw material gas supply part, a loose body (SOOT body) lifting rotating part, an operation computer and a waste gas recovery part. Of which a burner group is one of the most critical, which usually consists of a core lamp and one or more envelope lamps, the function of which is to eject the Sicl₄、Gecl₄、H₂、O₂The mixed gas is subjected to high-temperature combustion in the burner region of the blast lamp to generate hydrolysis reaction to generate SiO₂、GeO₂And the like of the powders (1) and (2). SiO 2₂、GeO₂The powder is deposited and attached to the surface of a rotating quartz target rod under the action of the thermophoresis principle to manufacture a loose body (VAD SOOT) manufactured by an axial vapor deposition method.

Sicl₄+O₂+2H₂→SiO₂+4HCl (1)

GeCl₄+O₂+2H₂→GeO₂+4HCl (2)

And vitrifying the loose body (VAD SOOT) manufactured by the axial vapor deposition method at the high temperature of 1500 ℃ to finally manufacture the transparent optical fiber preform core rod. Compared with metal blowlamps, quartz blowlamps have been used in axial vapor deposition (VAD) processes because of their good temperature resistance and no metallic impurities.

The blowtorch is used as the place for mixing and reacting the raw material gas, the change of the internal structure directly affects the production cost and the quality of the prefabricated rod, and part of SiO which is not recovered by the waste gas recovery part in the production process₂、GeO₂Powder (powder impurity) adsorbs easily and falls inside the blowtorch after blowtorch internal surface or loose body (SOOT body) fracture, and on the one hand, the powder impurity of gathering can lead to the blowtorch aperture to diminish, causes the gas pocket to block up when serious. The reduction of the burner aperture can directly affect the flow velocity distribution of the raw material gas, which leads to the change of the optical refractive index profile of the prefabricated rod and the deterioration of the quality of the prefabricated rod. On the other hand, in the production process, the accumulated powder impurities can swim to the surface of a loose body (SOOT body), after the powder impurities with different densities are agglomerated, bubbles are easy to appear in the preform after high-temperature sintering, the bubbles are drawn into an optical fiber, the phenomenon of gas lines can occur, and the quality of the preform can be reduced. Therefore, aiming at the blowtorch, the cleaning operation with high efficiency and regularity needs to be matched, but in the actual production process, the traditional blowtorch cleaning mode has the following problems:

1. the traditional torch cleaning method lacks high efficiency: the blowtorch is clean to go on when equipment standby usually, when the inside more powder impurity that gathers of blowtorch, at first need dismantle the raw materials gas pipeline of connecting the blowtorch surface, then with the help of high-pressure gas nitrogen gas (N2) or compressed air (CDA) aim at each layer mouth of pipe of blowtorch and sweep one by one, treat inside powder impurity of blowtorch and blow off outside the lamp, after the work of sweeping, on-the-spot again passes through the plastics adapter with the raw materials gas pipeline one by one and fixes each layer mouth of pipe surface of blowtorch. Whole process is manual operation basically all, and the blast lamp of complex structure is clean to the site personnel operation requirement than higher, especially the fixed connection operation of plastic adapter and quartz blast lamp, and when the plastics adapter internal thread was twisted round in the manual work, must keep moderate hard, hard too big lead to the fact the blast lamp interface position damaged easily, hard too little lead to the fact raw materials trachea and blast lamp connection position gas tightness bad easily, the gaseous raw materials that appears in the production process reveals. Generally, as shown in fig. 5 and 6, the VAD blowtorch is composed of 4-10 layers of concentric cylinders, and appropriate gas purging flow needs to be matched for lamp walls with different apertures in each layer inside the blowtorch, and in a traditional blowtorch cleaning mode, purging flow needs to be manually adjusted multiple times one by one, so that the overall workload is relatively large.

2. The traditional torch cleaning method lacks timeliness: if the blowtorch can not be timely cleaned in earlier stage, after the long-time high-temperature production, the powder impurity that the blowtorch is inside to gather can firmly adhere lamp wall internal surface, and at this moment, it is relatively poor to borrow high-pressure gas to sweep powder impurity effect again, can only dismantle behind the blowtorch with the help of chemical reagent like hydrofluoric acid and wash, and the whole dismantlement of blowtorch, wash, install technology debugging process work load also great, production efficiency greatly reduced.

In view of the foregoing, there is a need for an efficient automatic cleaning device and method for cleaning VAD torches.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: the VAD blowtorch cleaning device and the cleaning method thereof are provided for solving the defects that the blowtorch interface part is easy to damage and the blowtorch is not easy to be cleaned in time due to the low automation degree of the blowtorch cleaning mode and multiple manual disassembly links in the prior art.

The utility model provides a technical scheme that its technical problem adopted is:

a VAD torch cleaning device comprising:

a purge gas supply device for generating and discharging a gas for torch cleaning;

the air inlet pipeline switching mechanism is provided with two air inlet ends and an air outlet end and is used for selectively switching on one pipeline of the two air inlet ends and switching off the other pipeline; one of the gas inlet ends of the gas inlet pipeline switching mechanism is used for connecting a production raw material gas inlet pipe;

one end of the air inlet pipe of the blast lamp set is connected with the air outlet end of the air inlet pipeline switching mechanism, and the other end of the air inlet pipe of the blast lamp set is connected with the air inlet end of the blast lamp set;

one end of the scavenging gas branch pipe is connected with the scavenging gas supply device through a scavenging gas supply cabinet main pipe, and the other end of the scavenging gas branch pipe is connected with the other gas inlet end of the gas inlet pipeline switching mechanism;

and the deposition cavity exhaust pipe is arranged at the exhaust end of the blast burner set and used for sucking powder impurities out of the blast burner set.

Preferably, the VAD torch cleaning device of the present invention, the air inlet pipe switching mechanism includes:

a tee having two inlet ends, one outlet end;

and the automatic valve is arranged at the raw material gas inlet pipe and the cleaning gas branch pipe and can control the opening and closing of the pipeline.

Preferably, the utility model discloses a VAD blowtorch cleaning device, deposit cavity exhaust column welds in deposit cavity side, just right the exhaust end of blowtorch group, deposit cavity exhaust column leads exhaust pipe sealing connection through soft the exhaust end of blowtorch group, soft leading exhaust pipe can be dismantled.

Preferably, in the VAD blowlamp cleaning device of the present invention, the blowlamp set is composed of a single lamp and a core lamp, the bag lamp and the core lamp are both of a multilayer structure, and each layer has an independent air inlet end; the air inlet pipeline switching mechanism, the blowtorch group air inlet pipe and the cleaning gas branch pipe are arranged corresponding to each layer of the bag lamp and the core lamp.

Preferably, the VAD blowlamp cleaning device of the present invention, the sweeping gas supply device is provided with a pressure regulating valve, a flow meter, an automatic valve and a pressure gauge respectively; each scavenging gas branch pipe is provided with an independent flow meter and an automatic valve.

Preferably, the VAD blowlamp cleaning device of the present invention further comprises a programmable logic controller, the purge gas supply device is connected to the programmable logic controller, and the programmable logic controller is used for controlling the opening and closing of all automatic valves.

Preferably, the utility model discloses a VAD blowtorch cleaning device, soft air guide and exhaust pipe sets up trompil one, trompil two, trompil three, and trompil one, trompil two, trompil three all possess elasticity, and respectively with package lamp socket, core lamp socket, the seamless parcel of deposit cavity exhaust column mouth of pipe.

Preferably, the utility model discloses a VAD blowtorch cleaning device, clean the gas supply cabinet be responsible for with clean the gas branch pipe material and choose for use the 316 stainless steel, the blowtorch group intake pipe with the Teflon material is chooseed for use to the gaseous intake pipe of raw materials for production.

Preferably, the VAD torch cleaning device of the present invention, the purge gas supply cabinet main pipe aperture is 1/2 inches, the purge gas branch pipe aperture is 1/4 inches, and the torch set intake pipe aperture is 3/8 inches.

Preferably, the utility model discloses a VAD blowtorch cleaning device, the soft type air guide and exhaust pipe material is PVC steel wire flexible hose.

A method of cleaning a VAD torch cleaning device, comprising the steps of:

s1, controlling the production raw material gas supply cabinet to stop working;

s2, installing a soft guide exhaust pipe, connecting one end of the soft guide exhaust pipe to the exhaust end of the spray lamp group, and connecting the other end of the soft guide exhaust pipe to the deposition cavity exhaust pipe;

and S3, controlling an automatic valve on a raw material gas inlet pipe of the raw material gas supply cabinet to be closed, controlling an automatic valve on the cleaning gas supply device to be opened, starting the cleaning gas supply device to introduce cleaning gas into the blast lamp set, and simultaneously controlling one end of a deposition cavity exhaust pipe to start exhausting, so that powder impurities in the blast lamp set are sucked out of the blast lamp and enter a waste gas recovery part.

Preferably, the cleaning method of the VAD torch cleaning device of the present invention is characterized in that: in step S3, the opening and closing of all the automatic valves are controlled by a programmable logic controller.

Preferably, the cleaning method of the VAD torch cleaning device of the present invention is characterized in that: in step S3, the automatic valves are controlled by the plc to open sequentially for a set period of time and then close.

Preferably, the cleaning method of the VAD torch cleaning device of the present invention is characterized in that: before step S3, the purge flow rate of each layer space inside the torch is set to be proportional to the volume of each layer space inside the torch, and the actual flow rate of each layer inside the torch is adjusted by adjusting the flow meter in step S3.

The utility model has the advantages that: raw material gas or cleaning gas is directly switched at the gas inlet end of the blowtorch, the blowtorch cleaning is carried out without disassembling a raw material gas pipeline, the pipeline disassembly and assembly times of the gas inlet pipe orifice of the blowtorch are reduced, and the possibility of damaging the gas inlet pipe orifice is reduced; the automatic degree is high, has saved the manual work and has torn open, has adorned the step of gas pipeline into, and the cleanness can in time go on, greatly slows down quartz blowtorch inlayer scale deposit speed, reduces the risk that bubble, optical parameter worsen appear in the prefabricated stick plug of optic fibre, extension blowtorch life has improved production efficiency greatly.

Through controlling auxiliary equipment such as automatic valve opening and closing and leading blast pipe with the help of the PLC controller realize inside each layer space of VAD blowtorch in time clear up the operation high-efficiently, through the inside each layer space of clean blowtorch of flow control accuracy.

Drawings

The technical solution of the present application is further explained below with reference to the drawings and the embodiments.

FIG. 1 is a schematic view of a VAD torch cleaning apparatus;

FIG. 2 is a schematic diagram of a VAD torch production plant;

FIG. 3 is a schematic view of the VAD torch production and cleaning apparatus assembly;

FIG. 4 is a schematic view of a purge gas flow control apparatus of the apparatus of FIG. 1;

FIG. 5 is a schematic diagram of a conventional VAD five-layer packet lamp;

FIG. 6 is a schematic diagram of a conventional VAD five-layer core lamp;

FIG. 7 is a cross-sectional view of a conventional VAD penta-layered lamp;

FIG. 8 is a cross-sectional view of a conventional VAD five-layer core lamp;

FIG. 9 illustrates a flexible exhaust duct;

FIG. 10 is a cross-sectional view of refractive index of a core rod for an optical fiber preform manufactured by a VAD torch cleaned by a conventional cleaning method.

Description of the symbols of the drawings:

a deposition chamber 1, a VAD package lamp 2, a VAD core lamp 3, a deposition chamber exhaust tube 4, a monitoring computer 15, a PLC controller 16, a first automatic valve 25, a second automatic valve 26, a third automatic valve 28, a fourth automatic valve 33, a fifth automatic valve 38, a sixth automatic valve 43, a seventh automatic valve 48, an eighth automatic valve 53, a ninth automatic valve 58, a tenth automatic valve 63, an eleventh automatic valve 68, a twelfth automatic valve 73, a thirteenth automatic valve 17, a fourteenth automatic valve 18, a first production raw material gas supply tank 19, a second production raw material gas supply tank 20, a sweep gas supply tank 21, a sweep gas supply tank main tube 22, a sweep gas supply tank main tube pressure regulating valve 23, a pressure gauge 81, a first float flow meter 24, a second float flow meter 29, a third float flow meter 34, a fourth float flow meter 39, a fifth float flow meter 44, a sixth float flow meter 49, a third float flow meter 34, a third float flow meter 39, A seventh float flow meter 54, an eighth float flow meter 59, a ninth float flow meter 64, a tenth float flow meter 69, an eleventh float flow meter 74, a purge gas first branch pipe 37, a purge gas second branch pipe 42, a purge gas third branch pipe 32, a purge gas fourth branch pipe 47, a purge gas fifth branch pipe 27, a purge gas sixth branch pipe 62, a purge gas seventh branch pipe 67, a purge gas eighth branch pipe 57, a purge gas ninth branch pipe 72, a purge gas tenth branch pipe 52, a production raw material gas first inlet pipe 41, a production raw material gas second inlet pipe 46, a production raw material gas third inlet pipe 36, a production raw material gas fourth inlet pipe 51, a production raw material gas fifth inlet pipe 31, a production raw material gas sixth inlet pipe 66, a production raw material gas seventh inlet pipe 71, a production raw material gas eighth inlet pipe 61, a production raw material gas ninth inlet pipe 76, a purge gas outlet pipe 31, a purge, A decimal gas pipe 56 for production raw material gas, a first layer gas inlet pipe orifice 5 for a package lamp, a second layer gas inlet pipe orifice 6 for a package lamp, a third layer gas inlet pipe orifice 7 for a package lamp, a fourth layer gas inlet pipe orifice 8 for a package lamp, a fifth layer gas inlet pipe orifice 9 for a package lamp, a first layer gas inlet pipe orifice 10 for a core lamp, a second layer gas inlet pipe orifice 11 for a core lamp, a third layer gas inlet pipe orifice 12 for a core lamp, a fourth layer gas inlet pipe orifice 13 for a core lamp, a fifth layer gas inlet pipe orifice 14 for a core lamp, a first layer gas inlet pipe 40 for a package lamp, a second layer gas inlet pipe 45 for a package lamp, a third layer gas inlet pipe 35 for a package lamp, a fourth layer gas inlet pipe 50 for a package lamp, a fifth layer gas inlet pipe 30 for a package lamp, a first layer gas inlet pipe 65 for a core lamp, a second layer gas inlet pipe 70 for a core lamp, a third layer gas inlet pipe 60 for a core lamp, a fourth layer gas inlet pipe 75 for a core lamp, a fifth layer gas inlet pipe, Package lamp first layer pipe diameter internal diameter D1, package lamp second layer pipe diameter internal diameter D2, package lamp third layer pipe diameter internal diameter D3, package lamp fourth layer pipe diameter internal diameter D4, package lamp fifth layer pipe diameter internal diameter D5, core lamp first layer pipe diameter internal diameter D6, core lamp second layer pipe diameter internal diameter D7, core lamp third layer pipe diameter internal diameter D8, core lamp fourth layer pipe diameter internal diameter D9, core lamp fifth layer pipe diameter D10, package lamp first layer connecting pipe bottom distance L1, package lamp second layer connecting pipe bottom distance L2, package lamp third layer connecting pipe bottom distance L3, package lamp fourth layer connecting pipe bottom distance L4, package lamp fifth layer connecting pipe bottom distance L5, core lamp first layer connecting pipe bottom distance L6, core lamp second layer connecting pipe bottom distance L7, core lamp third layer connecting pipe bottom distance L8, core lamp fourth layer connecting pipe bottom distance L9, core lamp first layer connecting pipe bottom distance L10.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention is further described below with reference to the following embodiments.

The present embodiment provides a VAD torch cleaning device, including:

and the deposition cavity exhaust pipe 4 is arranged at the exhaust end of the blast burner set and is used for sucking powder impurities out of the blast burner set.

Preferably, in the VAD torch cleaning device of the present embodiment, the intake pipe switching mechanism includes:

a tee having two inlet ends, one outlet end;

Preferably, in the VAD torch cleaning device of this embodiment, the deposition cavity exhaust pipe is welded to the side surface of the deposition cavity and faces the exhaust end of the torch set, the deposition cavity exhaust pipe is hermetically connected to the exhaust end of the torch set through a soft exhaust guide pipe, and the soft exhaust guide pipe is detachable.

Preferably, in the VAD torch cleaning device of the present embodiment, the torch set is composed of a single lamp and a core lamp, the envelope lamp and the core lamp are both in a multilayer structure, and each layer has an independent air inlet end; the air inlet pipeline switching mechanism, the blowtorch group air inlet pipe and the cleaning gas branch pipe are arranged corresponding to each layer of the bag lamp and the core lamp.

Preferably, the VAD blowlamp cleaning device of the embodiment, the purge gas supply device is provided with a pressure regulating valve, a flow meter, an automatic valve and a pressure gauge respectively; each scavenging gas branch pipe is provided with an independent flow meter and an automatic valve.

Preferably, the VAD torch cleaning device of the present embodiment further includes a programmable logic controller, and the purge gas supply device is connected to the programmable logic controller, and the programmable logic controller is configured to control opening and closing of all automatic valves.

The embodiment provides a cleaning method of a VAD torch cleaning device, which adopts the VAD torch cleaning device, and comprises the following steps:

s1, controlling the production raw material gas supply cabinet to stop working;

Preferably, the cleaning method of the VAD torch cleaning device of the present embodiment is characterized in that: in step S3, the opening and closing of all the automatic valves are controlled by a programmable logic controller.

Preferably, the cleaning method of the VAD torch cleaning device of the present embodiment is characterized in that: in step S3, the automatic valves are controlled by the plc to open sequentially for a set period of time and then close.

Preferably, the cleaning method of the VAD torch cleaning device of the present embodiment is characterized in that: before step S3, the purge flow rate of each layer space inside the torch is set to be proportional to the volume of each layer space inside the torch, and the actual flow rate of each layer inside the torch is adjusted by adjusting the flow meter in step S3.

As shown in FIG. 1, a VAD blowtorch cleaning device comprises a cleaning gas supply cabinet 21, a cleaning gas supply cabinet main pipe 22, a monitoring computer 15, a package lamp 2, a core lamp 3, a package lamp first layer gas inlet pipe 40, a package lamp second layer gas inlet pipe 45, a package lamp third layer gas inlet pipe 35, a package lamp fourth layer gas inlet pipe 50, a package lamp fifth layer gas inlet pipe 30, a core lamp first layer gas inlet pipe 65, a core lamp second layer gas inlet pipe 70, a core lamp third layer gas inlet pipe 60, a core lamp fourth layer gas inlet pipe 75, a core lamp fifth layer gas inlet pipe 55, a deposition cavity 1, a deposition cavity exhaust pipe 4, a soft type exhaust guide pipe 77, a first branch pipe 37, a second branch pipe 42, a third branch pipe 32, a fourth branch pipe 47, a fifth branch pipe 27 for introducing cleaning gas supply cabinet main pipe 22 into the package lamp 2, a sixth branch pipe 62, a seventh branch pipe 67, a fifth branch pipe 27 for introducing cleaning gas supply cabinet main pipe 22 into the, Eighth branch 57, ninth branch 72, tenth branch 52.

As shown in fig. 3, the purge gas supply tank main pipe 22 is provided with a pressure regulating valve 23, a first float flowmeter 24, a first automatic valve 25, a second automatic valve 26, and a pressure gauge 81, respectively. A fifth automatic valve 38 and a fourth float flowmeter 39 are respectively arranged on a first branch pipe 37 of the cleaning gas supply tank main pipe 22, a sixth automatic valve 43 and a fifth float flowmeter 44 are respectively arranged on a second branch pipe 42, a fourth automatic valve 33 and a third float flowmeter 34 are respectively arranged on a third branch pipe 32, a seventh automatic valve 48 and a sixth float flowmeter 49 are respectively arranged on a fourth branch pipe 47, a third automatic valve 28 and a second float flowmeter 29 are respectively arranged on a fifth branch pipe 27, the sixth branch pipe 62 is provided with a tenth automatic valve 63 and a ninth float flowmeter 64, respectively, the seventh branch pipe 67 is provided with an eleventh automatic valve 68 and a tenth float flowmeter 69, respectively, the eighth branch pipe 57 is provided with a ninth automatic valve 58 and an eighth float flowmeter 59, respectively, the ninth branch pipe 72 is provided with a twelfth automatic valve 73 and an eleventh float flowmeter 74, respectively, and the tenth branch pipe 52 is provided with an eighth automatic valve 53 and a seventh float flowmeter 54, respectively.

In one embodiment, the VAD torch is composed of a lamp 2 and a core lamp 3, as shown in fig. 5 and 7, the lamp 2 has a 5-layer structure, which is marked as a first layer, a second layer, a third layer, a fourth layer and a fifth layer from inside to outside, as shown in fig. 6 and 8, and the core lamp 3 has a 5-layer structure, which is marked as a first layer, a second layer, a third layer, a fourth layer and a fifth layer from inside to outside. As shown in FIG. 3, two ends of the first layer of inlet tube 40 of the package lamp are respectively communicated with the first branch tube 37 of the scavenging gas and the first layer of inlet tube 5 of the package lamp, two ends of the second layer of inlet tube 45 of the package lamp are respectively communicated with the second branch tube 42 of the scavenging gas and the second layer of inlet tube 6 of the package lamp, two ends of the third layer of inlet tube 35 of the package lamp are respectively communicated with the third branch tube 32 of the scavenging gas and the third layer of inlet tube 7 of the package lamp, two ends of the fourth layer of inlet tube 50 of the package lamp are respectively communicated with the fourth branch tube 47 of the scavenging gas and the fourth layer of inlet tube 8 of the package lamp, two ends of the fifth layer of inlet tube 30 of the package lamp are respectively communicated with the fifth branch tube 27 of the scavenging gas and the fifth layer of inlet tube 9 of the package lamp, two ends of the first layer of inlet tube 65 of the core lamp are respectively communicated with the sixth branch tube 62 of, Two ends of the core lamp third layer air inlet pipe 60 are respectively communicated with the cleaning gas eighth branch pipe 57 and the core lamp third layer air inlet pipe opening 12, two ends of the core lamp fourth layer air inlet pipe 75 are respectively communicated with the cleaning gas ninth branch pipe 72 and the core lamp fourth layer air inlet pipe opening 13, and two ends of the core lamp fifth layer air inlet pipe 55 are respectively communicated with the cleaning gas tenth branch pipe 52 and the core lamp fifth layer air inlet pipe opening 14.

In one embodiment, the system further comprises a PLC controller 16, wherein the first production raw gas supply cabinet 19, the second production raw gas supply cabinet 20 and the sweep gas supply cabinet 21 are connected with the PLC controller 16, and the PLC controller 16 is used for controlling the opening and closing of all automatic valves.

As shown in fig. 9, before the blowtorch is cleaned, the soft exhaust guide pipe 77 is installed manually, and the soft exhaust guide pipe is provided with a first opening 78, a second opening 79 and a third opening 89, and is respectively wrapped with the lamp socket of the package lamp 2, the lamp socket of the core lamp 3 and the nozzle of the deposition cavity exhaust pipe 4 in a seamless manner, so that the air tightness is better. In the process of cleaning the blowtorch, powder impurities are sucked out of the blowtorch and enter a waste gas recovery part by the aid of a large pressure difference formed inside and outside the blowtorch by means of the suction force of the high-pressure gas blowing and combining deposition cavity exhaust pipe 4. Then, the PLC controller 16 is triggered through the monitoring computer 15, the cleaning gas supply cabinet 21 starts to work, all automatic valves are controlled to be opened and closed through adjusting the flow of the float flowmeter and the PLC controller 16, and the function that cleaning gas with different flow rates cleans all layers of spaces inside the bag lamps and the core lamps one by one is achieved.

In one embodiment, the deposition chamber exhaust tube 4 is welded to the side of the deposition chamber 1 opposite to the envelope lamp 2 and the core lamp 3. When the equipment is standby and is in production, the air draft in the air draft pipe 4 of the deposition cavity is kept normally open.

In one embodiment, the system further comprises a first production raw gas supply cabinet 19 and a second production raw gas supply cabinet 20, wherein the first production raw gas supply cabinet 19 and the second production raw gas supply cabinet 20 work normally in the torch production process, and the torch enters a cleaning process after the production work is finished. A first production raw material gas inlet pipe 41, a second gas inlet pipe 46, a third gas inlet pipe 36, a fourth gas inlet pipe 51 and a fifth gas inlet pipe 31 are arranged on a first production raw material gas supply cabinet 20, the first production raw material gas inlet pipe 41, the second gas inlet pipe 46, the third gas inlet pipe 51, the fourth gas inlet pipe 46 and the fifth gas inlet pipe 31 are respectively communicated with a first lamp-wrapped layer gas inlet pipe 40, a second layer gas inlet pipe 45, a third layer gas inlet pipe 35, a fourth layer gas inlet pipe 50 and a fifth layer gas inlet pipe 30, a second production raw material gas supply cabinet 20 is provided with a sixth production raw material gas inlet pipe 66, a seventh gas inlet pipe 71, an eighth gas inlet pipe 61, a ninth gas inlet pipe 76 and a tenth gas pipe 56, and a sixth production raw material gas inlet pipe 66, a seventh gas inlet pipe 71, an eighth gas inlet pipe 61, a ninth gas inlet pipe 76 and a tenth gas inlet pipe 56 are respectively communicated with a first core lamp layer, A third layer air inlet pipe 60, a fourth layer air inlet pipe 75 and a fifth layer air inlet pipe 55.

In one embodiment, the material of the VAD package lamp and the VAD core lamp is GE-214 quartz.

In one embodiment, the flexible air guiding and exhausting pipe 77 is made of a PVC steel wire flexible hose, and has good elastic performance, light installation and detachability.

In one embodiment, the main purge gas supply cabinet 22 and all purge gas manifolds are made of 316 stainless steel, and all torch inlet tubes and all process gas inlet tubes are made of Teflon. Purge gas supply cabinet main 22 aperture 1/2 inches, all purge gas manifold apertures 1/4 inches, and all torch inlet tube apertures 3/8 inches.

The utility model discloses still disclose a VAD blowtorch cleaning device's cleaning method, this method contains following step:

torch cleaning preparation 1: after VAD deposition is finished, the thirteenth automatic valve 17 and the fourteenth automatic valve 20 are automatically closed, an operator takes the loose body (SOOT body) out of the deposition cavity 1, then a soft type air guide and exhaust pipe 77 is installed, and the elastic opening I78, the opening II 79 and the opening III 89 are respectively and seamlessly wrapped with the lamp socket of the package lamp 2, the lamp socket of the core lamp 3 and the pipe orifice of the deposition cavity exhaust pipe 4;

torch cleaning preparation 2: opening a main pipe pressure regulating valve 23 of an N2 supply cabinet, regulating the pressure regulating valve, regulating the pressure of the N2 supply cabinet to 0.3Mpa, regulating a first float flowmeter 24, controlling the main pipe flow F1 of the N2 supply cabinet to be 100-150 SLM, and triggering a PLC (programmable logic controller) 16 through a monitoring computer 15 to sequentially and synchronously open a first automatic valve 25 and a second automatic valve 26;

n2 flow regulation: as shown in fig. 7, fig. 8 and table 1, the volumes of the spaces in the respective layers inside the burner are different, and theoretically, different numbers of layers are required to match different purge flows.

As shown in table 2, the purge flow set value of each layer of space inside the torch is proportional to the volume of each layer of space inside the torch;

the PLC controller 16 operates: triggering the PLC controller 16 through the monitoring computer 15, as shown in Table 3, after the PLC controller 16 responds, synchronously opening and closing the automatic valve after the time T1: 1-5 s, T2: 10-15 s, T3: 15-25 s, T4: 20-35 s, T5: 25-45 s, T6: 30-55 s, T7: 35-65 s, T8: 40-75 s, T9: 45-85 s, T10: 60-100 s and T11: 100-120 s respectively, as shown in FIG 4, the flow direction of N2 entering a blast lamp air receiving pipe from a supply cabinet, and the cleaning process of each layer in the blast lamp is performed according to the steps of-

Sequentially carrying out the steps;

note: in the table, the automatic valve number 0 indicates open, and the automatic valve number 1 indicates closed.

The first automatic valve 25 and the second automatic valve 26 are closed in sequence and synchronously, the soft type gas guide and exhaust pipe 77 is disassembled, the mouth of the blowtorch is sealed by a plastic lampshade, the powder impurities are prevented from falling into the blowtorch for the second time, and the cleaning work of the whole blowtorch is finished;

normally using a blast burner for depositing a loose body (SOOT body) to prepare an optical fiber preform core rod;

in the later production process, when the space of each layer in the VAD blowtorch reaches the cleaning standard, the flow of the float flowmeter on the cleaning gas main pipe and the branch pipe is kept unchanged.

The utility model discloses still provide a plurality of concrete implementation sight.

Implementation scenario 1:

after VAD deposition is finished, the thirteenth automatic valve and the fourteenth automatic valve are automatically closed, an operator takes the loose body (SOOT body) away from the deposition cavity, then a soft type air guide and exhaust pipe is installed, and the elastic opening I, the elastic opening II and the elastic opening III are respectively and seamlessly wrapped with the lamp socket of the package lamp, the lamp socket of the core lamp and the mouth of the air exhaust pipe of the deposition cavity;

opening a main pipe pressure regulating valve of the N2 supply cabinet, manually regulating a first float flowmeter, controlling the main pipe flow F1:120SLM of the N2 supply cabinet, and triggering a PLC controller to sequentially and synchronously open a first automatic valve and a second automatic valve through a monitoring computer;

as shown in tables 4 and 5, the purge flow, purge time, and number of burner layers cleaning sequence for each layer of N2 inside the burner;

closing the first automatic valve and the second automatic valve in sequence and synchronously, disassembling the soft type gas guide and exhaust pipe, sealing the mouth of the blowtorch by using a plastic lamp cover, and finishing the cleaning work of the whole blowtorch;

the torch is normally used for deposition of a loose body (SOOT body) to prepare an optical fiber preform core rod.

Compared with the traditional cleaning method, the core lamp begins to generate a slight scaling phenomenon after being used for 2 months, the scaling phenomenon is serious after being used for 3-4 months, and the scaling part needs to be pickled by hydrofluoric acid when being used for 5 months. VAD blowtorch process the utility model discloses device and clean method are clean after, the speed of package lamp and core lamp inlayer scale deposit slows down greatly, and slight structure phenomenon appears after the core lamp uses 6 months, and it is more serious to use 10 ~ 11 months scale deposits, needs hydrofluoric acid pickling scale deposit position when using 12 months.

Implementation scenario 2:

opening a main pipe pressure regulating valve of the N2 supply cabinet, manually regulating a first float flowmeter, controlling the main pipe flow F1:100SLM of the N2 supply cabinet, and triggering a PLC controller to sequentially and synchronously open a first automatic valve and a second automatic valve through a monitoring computer;

as shown in tables 6 and 7, the purge flow, purge time, and number of burner layers cleaning sequence for each layer of N2 inside the burner;

The VAD blowtorch is prepared by a traditional cleaning method, the cladding of the optical fiber preform core rod begins to generate more bubbles within 2-3 months, the number of the bubbles is 2-5, the cladding of the core layer begins to generate more bubbles within 3-4 months, and the number of the bubbles is 3-5. Contrast traditional clean method, VAD blast burner process the utility model discloses the optical fiber perform plug of device and clean back preparation appears more bubble phenomenon and obtains effectively suppressing, and more bubble begins to appear about 8 ~ 10 months of plug cladding, and bubble number 2 ~ 4, more bubble begin to appear about 10 ~ 12 months of sandwich layer, bubble number 1 ~ 4.

Implementation scenario 3:

opening a main pipe pressure regulating valve of the N2 supply cabinet, manually regulating a first float flowmeter, controlling the main pipe flow F1:150SLM of the N2 supply cabinet, and triggering a PLC controller to sequentially and synchronously open a first automatic valve and a second automatic valve through a monitoring computer;

as shown in tables 8 and 9, the purge flow rate, purge time, and number of burner layers cleaning sequence for each layer N2 inside the burner;

As shown in fig. 10, the embodiment of the present invention is shown in the comparison graph of refractive index profile of the core rod of the optical fiber preform prepared by the cleaning blowtorch of the conventional cleaning method, and the embodiment of the present invention is more ideal for the optical parameters of the core rod after 4 months and 8 months of VAD continuous production, and meets the design requirements of single mode fiber. For example, the refractive index profile is significantly better than the refractive index profile of a core rod after 4 months of continuous VAD production with conventional cleaning.

It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A VAD torch cleaning device, comprising:

2. The VAD torch cleaning device defined in claim 1 wherein the intake line switching mechanism comprises:

a tee having two inlet ends, one outlet end;

3. The VAD torch cleaning device of claim 2, wherein the deposition chamber exhaust tube is welded to the side of the deposition chamber and faces the exhaust end of the torch set, and is hermetically connected to the exhaust end of the torch set through a flexible exhaust tube, and the flexible exhaust tube is detachable.

4. The VAD torch cleaning device according to any of the claims 1-3, wherein the torch group consists of one lamp only and one core lamp, the envelope lamp and the core lamp are both of a multilayer structure, and each layer has a separate air inlet end; the air inlet pipeline switching mechanism, the blowtorch group air inlet pipe and the cleaning gas branch pipe are arranged corresponding to each layer of the bag lamp and the core lamp.

5. The VAD torch cleaning device according to claim 4, wherein the purge gas supply device is provided with a pressure regulating valve, a flow meter, an automatic valve and a pressure gauge, respectively; each scavenging gas branch pipe is provided with an independent flow meter and an automatic valve.

6. The VAD torch cleaning device of claim 5 further comprising a programmable logic controller, the purge gas supply being connected to the programmable logic controller, the programmable logic controller being configured to control the opening and closing of all automatic valves.

7. The VAD blowtorch cleaning device as claimed in claim 3, wherein the flexible exhaust guide tube is provided with a first opening, a second opening and a third opening, and the first opening, the second opening and the third opening are all elastic and are respectively and seamlessly wrapped with the lamp holder, the lamp holder of the core lamp and the nozzle of the exhaust tube of the deposition cavity.

8. The VAD torch cleaning device according to any one of claims 1-3, wherein the purge gas supply cabinet main pipe and the purge gas branch pipe are made of 316 stainless steel, and the torch group intake pipe and the raw material gas intake pipe are made of Teflon.

9. The VAD torch cleaning apparatus of any one of claims 1-3 wherein the purge gas supply cabinet main tube aperture is 1/2 inches, the purge gas manifold aperture is 1/4 inches, and the torch block inlet tube aperture is 3/8 inches.

10. The VAD blowtorch cleaning device of claim 3 or 7, wherein the flexible air guiding and exhausting pipe is made of PVC steel wire flexible hose.