CN110788090A

CN110788090A - Improved generation MCVD system tail gas draws grey pole

Info

Publication number: CN110788090A
Application number: CN201911129080.XA
Authority: CN
Inventors: 韩志辉; 庞璐; 张勇; 王东波; 王树宇; 刘笑东
Original assignee: CETC 46 Research Institute
Current assignee: CETC 46 Research Institute
Priority date: 2019-11-18
Filing date: 2019-11-18
Publication date: 2020-02-14

Abstract

The invention discloses an improved MCVD system tail gas ash removing rod, which comprises a rod head and a rod body connected with the rod head, wherein one end of the rod head is provided with four concave air guide grooves around a central shaft, and the other end of the rod head is provided with internal threads; the both ends of every section pole body all are equipped with external screw thread and internal thread, and the whole pole body is crossed external screw thread and internal thread connection to the pole body of multistage pole, and the external screw thread of whole pole body one end is drawn grey pole for tail gas with the internal thread connection of pole head. In the design, in order to avoid the tail pipe from being blocked by residual powder, the phenomena of unsmooth circulation and blockage of the tail pipe are effectively reduced through the improved tail gas ash-removing rod, and the capability of removing the residual powder attached to the interior of the tail pipe is improved; the adoption of the Hastelloy and the polytetrafluoroethylene for the material of the ash digging rod greatly enhances the flexibility and the corrosion resistance of the rod body, and the design of four concave air guide grooves of the rod head maintains smooth airflow of a tail pipe and ensures constant tail pressure, so that the deposition of the reaction pipe is uniform, and the consistency of the product quality is ensured.

Description

Improved generation MCVD system tail gas draws grey pole

Technical Field

The invention relates to the technical field of special optical fiber manufacturing, in particular to an improved MCVD (chemical deposition process) system tail gas ash drawing rod.

Background

The special optical fiber is a novel material for a plurality of weapon devices, and is mainly applied to high-power optical fiber lasers, optical fiber gyro rings, external waveguides and SLD module tail fibers. Various special optical fibers are drawn from special optical fiber preforms. During the preparation of the prefabricated rod, the tail pipe is blocked by the residual materials and powder generated by the reaction, and the tail pipe is blocked and blocked due to the accumulation of the reaction tail gas and the thermophoresis effect, so that the pressure and flow fluctuation in the reaction process is caused, the deformation of the reaction pipe is serious, and the quality of the product is reduced. The traditional ash drawing rod has high rigidity, is not easy to thoroughly sweep residual powder of a tail pipe, and is very easy to cause the problems of unsmooth tail pipe, blockage and the like in the MCVD process, so that the diameter fluctuation of a reaction pipe is huge during deposition, the product consistency is greatly reduced, and a practical and feasible improvement scheme needs to be provided for the ash drawing rod so as to improve the flexibility and the usability of the ash drawing rod. The present invention is directed to solving this problem.

Disclosure of Invention

In view of the technical problems and the defects in the prior art, the invention aims to provide an improved MCVD system tail gas ash drawing rod. By adopting the design, the longitudinal uniformity and batch consistency of the preform can be effectively improved, and the special optical fiber quality improvement effect is obvious.

The technical scheme adopted by the invention is as follows: the utility model provides an ash pole is drawn to improved generation MCVD system tail gas which characterized in that: the tail pipe comprises a rod head in contact with the inner wall of the tail pipe and a rod body connected with the rod head, wherein four concave air guide grooves are arranged at one end of the rod head in contact with the inner wall of the tail pipe around a central shaft so as to improve the scraping and sweeping capacity when the inner wall of the tail pipe rotates; the other end of pole head is equipped with the internal thread, the pole body is established to the multistage, and the both ends of every section pole body all are equipped with external screw thread and internal thread, and the whole pole body of multistage pole body is through external screw thread and internal thread connection, and the external screw thread of whole pole body one end and the internal thread connection that the other end of pole head was equipped with do tail gas draw grey pole.

The diameter of one end of the rod head contacted with the inner wall of the tail pipe has the following relation with the diameter of the inner wall of the tail pipe: 2.5D = D, where D is the diameter of one end of the club head, D is the diameter of the inner wall of the tail pipe, unit: mm.

The depth of the concave air guide groove at one end of the club head, which is contacted with the inner wall of the tail pipe, and the diameter of one end of the club head have the following relational expression: 3c = d, wherein d is the diameter of one end of the club head, and c is the depth of the concave air guide groove, unit: mm.

The material of the rod head is Hastelloy alloy, and the material of the rod body is polytetrafluoroethylene, so that the service life of the ash removing rod in a strong corrosion environment is ensured.

The beneficial effects produced by the invention are as follows:

1. the length and the diameter of the tail pipe are adjusted when the MCVD is used for preparing the prefabricated rod, the length of the rod body and the diameter of the head part of the front end rod are increased or reduced, the rotating area can be increased after the improvement, and the capability of removing residual powder attached to the interior of the tail pipe is effectively improved.

2. The length of the variable-length shaft can be customized according to the requirement; the sizes of the rod head and the rod body are determined according to requirements, so that the purpose of changing the total length of the dust removing rod is achieved, the requirements of different lengths of tail pipes used in the MCVD process can be met, and the required length of the rod body and the threaded connection capacity of the rod head can be met.

3. The Hastelloy and the polytetrafluoroethylene (Teflon) are made of the ash digging rod, so that the flexibility and the corrosion resistance of the rod body are greatly enhanced, and the flexibility of the rod body is effectively utilized to thoroughly sweep the residual dust of the tail pipe. The application of this material has guaranteed promptly that pole body intensity satisfies its length and has supported, and the flexibility that its material possessed passes through the gravity contact pipe wall of pole head, can sweep the pipe diameter inner wall more easily, has strengthened greatly and has drawn the ash rod to the ability of sweeping of tail pipe inner wall, provides very big convenience for the clean pole body of handicraft personnel again in the later stage.

4. The four concave air guide grooves of the rod head are designed on the premise of ensuring thorough scraping and sweeping, so that the internal gas pressure and the balanced gas flow in the reaction process are effectively maintained, and the consistency of the product quality is ensured. When effectively cleaing away tail pipe inner wall and remaining the dust, guarantee that tail pipe tail gas air current is unobstructed, maintain the tail pressure invariable, reduce because of drawing the jam that the ash process produced and cause the reaction air current undulant, and then can make the reaction tube deposit even, reduce inside pressure fluctuation, pipe diameter stable.

Drawings

FIG. 1 is a schematic view of a club head structure according to the present invention;

FIG. 2 is a schematic view of a shaft structure of the present invention;

FIG. 3 is an assembly view of the shaft and the head of the present invention.

Detailed Description

The invention is further illustrated by the following figures and examples.

As shown in fig. 1, 2 and 3, the improved MCVD system tail gas ash removing rod comprises a rod head 1 contacting the inner wall of the tail pipe and a rod body 2 connected with the rod head 1, wherein four concave air guide grooves 1-1 are arranged around the central shaft at one end of the rod head 1 contacting the inner wall of the tail pipe to improve the scraping and sweeping ability when the inner wall of the tail pipe rotates; the other end of the club head 1 is provided with an internal thread 1-2 (female head); the rod body 2 is designed into multiple sections, the two ends of each section of rod body 2 are respectively provided with an external thread 2-1 (male head) and an internal thread 2-2 (female head), the multiple sections of rod bodies 2 are connected into a whole rod body through the external thread 2-1 and the internal thread 2-2 in a threaded manner, and the external thread 2-1 (male head) at one end of the whole rod body is connected with the internal thread 1-2 (female head) arranged at the other end of the rod head 1 to form a tail gas ash removing rod.

The diameter of one end of the rod head 1 which is contacted with the inner wall of the tail pipe has the following relation with the diameter of the inner wall of the tail pipe: 2.5D = D, where D is the diameter of one end of the club head 1, and D is the diameter of the inner wall of the tail pipe, unit: mm.

The depth of the concave air guide groove 1-1 at one end of the club head 1 which is contacted with the inner wall of the tail pipe and the diameter of one end of the club head 1 have the following relational expression: 3c = d, wherein d is the diameter of one end of the club head 1, and c is the depth of the concave air guide groove 1-1, unit: mm.

The material of this design club head 1 is the hastelloy alloy, and the material of pole body 2 is polytetrafluoroethylene to guarantee to draw out the life of grey pole in strong corrosive environment.

Example (b):

taking a tail pipe with a target inner diameter of 30mm and a length of 800mm as an example, the dust removing rod matched with the tail pipe is assembled for explanation. The specific operation method and steps are as follows:

(1) measuring the inner diameter of the tail pipe by using a vernier caliper, and selecting a 12 mm-diameter rod head 1; the relation between the diameter of one end of the rod head 1 contacting with the inner wall of the tail pipe and the diameter of the inner wall of the tail pipe is satisfied: 2.5D = D. The material is Hastelloy.

(2) Measuring the front and back positions of the MCVD system expansion piece and combining the length of the tail pipe to determine the length of the ash drawing rod to be 1250mm, and determining the length of the needed rod body according to the installation positions of the rod head 1 and the ash drawing rod. The material of the shaft body 2 is polytetrafluoroethylene.

(3) Machining an air guide groove 1-1 of the club head 1 by adopting a machining process, and machining four air guide grooves with the width of 2mm and the depth of 4mm according to the diameter of the club head 1 and by taking the axial direction of the club head as a center; the relation between the depth of the concave air guide groove 1-1 and the diameter of one end of the club head 1 is satisfied: 3c = d.

(4) And combining and assembling the processed club head 1 and the assembled club body into an ash removing club which is arranged in the tail pipe.

Claims

1. The utility model provides an ash pole is drawn to improved generation MCVD system tail gas which characterized in that: the tail pipe cleaning device comprises a rod head (1) contacted with the inner wall of a tail pipe and a rod body (2) connected with the rod head (1), wherein one end of the rod head (1) contacted with the inner wall of the tail pipe is provided with four concave air guide grooves (1-1) around a central shaft so as to improve the scraping and sweeping capacity when the inner wall of the tail pipe rotates; the other end of the club head (1) is provided with an internal thread (1-2); the tail gas dust removing rod is characterized in that the rod body (2) is designed into multiple sections, external threads (2-1) and internal threads (2-2) are arranged at two ends of each section of the rod body (2), the multiple sections of the rod body (2) are connected into a whole rod body through the external threads (2-1) and the internal threads (2-2), the external threads (2-1) at one end of the whole rod body are connected with the internal threads (1-2) arranged at the other end of the rod head (1) to form the tail gas dust removing rod.

2. The improved MCVD system tail gas ash drawing rod as claimed in claim 1, wherein: the diameter of one end of the rod head (1) contacting the inner wall of the tail pipe and the diameter of the inner wall of the tail pipe have the following relation: 2.5D = D, wherein D is the diameter of one end of the club head (1), and D is the diameter of the inner wall of the tail pipe, and the unit is as follows: mm.

3. The improved MCVD system tail gas ash drawing rod as claimed in claim 1, wherein: the above-mentioned

The depth of a concave air guide groove (1-1) at one end of the club head (1) contacted with the inner wall of the tail pipe and the diameter of one end of the club head (1) have the following relational expression: 3c = d, wherein d is the diameter of one end of the club head (1), and c is the depth of the concave air guide groove (1-1), and the unit is as follows: mm.

4. The improved MCVD system tail gas ash drawing rod as claimed in claim 1, wherein: the material of the rod head (1) is Hastelloy, and the material of the rod body (2) is polytetrafluoroethylene, so that the service life of the ash drawing rod in a strong corrosion environment is ensured.