CN2429528Y

CN2429528Y - Preheating furnace for producing preformed products for optical fibers

Info

Publication number: CN2429528Y
Application number: CN 00230169
Authority: CN
Inventors: 王淑斌; 戚卫; 伍叔坚; 雷道玉; 汪松
Original assignee: Fiberhome Telecommunication Technologies Co Ltd
Current assignee: Fiberhome Telecommunication Technologies Co Ltd
Priority date: 2000-06-16
Filing date: 2000-06-16
Publication date: 2001-05-09
Anticipated expiration: 2010-06-16

Abstract

The utility model relates to a preheating furnace matched with a microwave device for producing preformed products for optical fibers in a PCVD method, which comprises a furnace body which is transversely arranged and can be divided into two halves. An electric heating element is arranged in a furnace hearth of the furnace body along the circumferential direction. The middle parts of both ends of the furnace body are provided with coaxial through holes. A longitudinal through groove is arranged below the furnace body, and the upper side of the furnace body is connected with a switching hinge. The utility model has good high temperature and heat-insulating properties, and can guarantee the efficient implementation of the PCVD method. The utility model has the advantages of simple and reasonable structure arrangement, reliable operating properties, long service life, convenient operation and low cost.

Description

Be used to make the preheating oven device of fibre-optical preform

The utility model relates to a kind ofly makes the preheating oven device of fibre-optical preform and microwave device phase configuration with the PCVD legal system, belongs to the optical fiber fabrication equipment technical field.

The optical fiber of conduction of being used to communicate by letter be glass lined bottom tube by the band glass coating through the molten rod that shortens into of high temperature, make through wire drawing again.The glass lined bottom tube that has glass coating is fibre-optical preform, is an important step in the optical fiber production.Had the processing method of several production fibre-optical preforms in the prior art, as the MCVD method, the VAD method, PCVD method etc., the PCVD method is a microwave activate plasma chemical Vapor deposition process, process characteristic with flexible precision, and microwave device is the core in the PCVD method making equipment, excite the mixed gas in the glass lined bottom tube to make it to become the plasma generation chemical reaction by the microwave energy that microwave device produced, in the glass lined bottom tube, generate one deck densification, the glass coating of close attachment, a fibre-optical preform must be coated several thousand layers of coating in the glass lined bottom tube, temperature coupling in this process between glass lined bottom tube and the plasma body is the precondition that guarantees that deposition reaction is effectively carried out, the preheating oven device is for realizing that the said temperature coupling is the supporting setting of microwave device, its effect will guarantee that exactly microwave device carries out above-mentioned work under the hot conditions of degree more than 1,000, be convenient to the glass lined bottom tube simultaneously and lay and process.The concrete structure of at present relevant preheating oven device is not seen in the report of open source literature as yet.

The purpose of this utility model is to design a kind of and the preheating oven device that is used to the make fibre-optical preform microwave device phase configuration, and it can guarantee the enforcement of PCVD method effectively easily.

The utility model is realized by following technical scheme: include the body of heater 5 that arranged transversely can half-and-half separate, the edge circumferentially is equipped with an electric heating element in the burner hearth of body of heater, the middle part, two ends of body of heater offers co-axial through hole 11, the below of body of heater offers vertical groove 12, and the top of body of heater links to each other with the folding hinge means.

Press such scheme, the upper end of folding hinge means can link with lifting hanger, so that body of heater can move up and down after opening.

Working process of the present utility model is: earlier body of heater is opened rising, the resonator cavity 7 of microwave device in the burner hearth is spun off, then work piece glass lined bottom tube 1 is passed resonator cavity and seal by two supports, fill mixed gas in the glass lined bottom tube, by the folding hinge means it is closed up after again body of heater decline being put in place, resonator cavity and glass lined bottom tube are all put in the burner hearth pass, the through hole that body of heater two ends middle parts is exposed at the two ends of glass lined bottom tube slightly, so that supporting, thereafter open an electric heating element, temperature in the furnace chamber is risen to more than 1000 ℃ equably, at this moment, the traversing carriage 6 of microwave device is under the driving of reciprocator, vertical straight trough along the body of heater below moves at the uniform velocity back and forth, can realize the chemical vapour deposition of microwave activate plasma, in the glass lined bottom tube, generate the glass coating of layer upon layer, produce fibre-optical preform.After the completion of processing, make body of heater open rising, can take off work piece, thereby finish the whole course of processing by the folding hinge means.

Positively effect of the present utility model is: 1, possess good high-temperature and heat-insulating property, for microwave device provides reliable Working environment, guaranteed effective enforcement of PCVD method; 2, structural device advantages of simple, reliable working performance, long service life, fire box temperature is evenly distributed; 3, the folding lifting device is set, uses easy to operate; 4, be easy to produce and make, cost of manufacture is low.

Fig. 1 is the structural diagrams of facing of an embodiment of the utility model.

Fig. 2 is the side-looking structural diagrams of an embodiment of the utility model.

Fig. 3 is the side direction view of the utility model when open mode.

Fig. 4 is the endocentric construction view of half of body of heater among embodiment of the utility model.

Fig. 5 is the A-A sectional view among Fig. 4.

Fig. 6 is the structural diagrams of lifting hanger among embodiment of the utility model.

Further specify embodiment of the present utility model below in conjunction with accompanying drawing, has the body of heater 5 that an arranged transversely can half-and-half separate, body of heater is long casing shape, the cross section is a rectangle, body of heater is made of the refractory materials encased steel plate, be laid with 4 an electric heating element 10 around in burner hearth, it is more even for fire box temperature is distributed, install auxiliary electrical heating unit 9 at two of burner hearth, can make like this fire box temperature reach 1000-1500 ℃ adjustable, burner hearth everywhere the temperature difference reach ± 3 ℃, for keeping lower stove table temperature, can in the furnace wall, lay cooling water channel 14, during use cooling water channel and cooling water source are connected, also can lay cooling air channel 13 at sidewall of the furnace body, co-axial through hole 11 is offered at middle part, two ends at body of heater, vertical groove 12 that the traversing carriage that can make microwave device moves is back and forth offered in the below of body of heater, the two ends of the top of body of heater and folding hinge means are hinged, the folding hinge means is by the long connecting rod 3 that is connected between body of heater and the suspension bracket, the pneumatic cylinder 2 that is connected in the short connecting rod 4 between expansion link and the body of heater and links to each other with the expansion link the other end constitutes, pneumatic cylinder is fixed on the suspension bracket, by moving down of pneumatic cylinder piston, short connecting rod is moved down, because long connecting rod is motionless, force length, short connecting rod opens to both sides, driving body of heater thus opens, otherwise, then body of heater closes up, the top and the lifting hanger of folding hinge means link, lifting hanger is made of suspension bracket 8 and lifting device, lifting device includes chain 16, fixed pulley 15, drive sprocket 18, one end and the suspension bracket of chain link, another termination counterweight 17 behind fixed pulley and drive sprocket, drive sprocket links with the drive unit 19 that has self-locking mechanism, can drive the suspension bracket oscilaltion by chain, thereby drive the lifting of whole body of heater, body of heater can be because of the deadweight landing, with the safety of guaranteeing that equipment uses when the effect of self-locking mechanism was to have a power failure.

Claims

1, a kind of preheating oven device that is used to make fibre-optical preform, it is characterized in that including the body of heater (5) that arranged transversely can half-and-half separate, the edge circumferentially is equipped with an electric heating element in the burner hearth of body of heater, the middle part, two ends of body of heater offers co-axial through hole (11), the below of body of heater offers vertical groove (12), and the top of body of heater links to each other with the folding hinge means.

2, by the described preheating oven device that is used to make fibre-optical preform of claim 1, it is characterized in that the upper end of folding hinge means can link with lifting hanger.

3, by claim 1 or the 2 described preheating oven devices that are used to make fibre-optical preform, it is characterized in that body of heater is long casing shape, the cross section is a rectangle, body of heater is made of the refractory materials encased steel plate, be laid with 4 an electric heating element (10) around in burner hearth, install auxiliary electrical heating unit (9) at two of burner hearth.

4, by the described preheating oven device that is used to make fibre-optical preform of claim 3, it is characterized in that fire box temperature reach 1000-1500 ℃ adjustable.

5, by claim 1 or the 2 described preheating oven devices that are used to make fibre-optical preform, it is characterized in that in the furnace wall, laying cooling water channel (14), lay cooling air channel (13) at sidewall of the furnace body.

6, by claim 1 or the 2 described preheating oven devices that are used to make fibre-optical preform, it is characterized in that the folding hinge means is by the long connecting rod (3) that is connected between body of heater and the suspension bracket, the pneumatic cylinder (2) that is connected in the short connecting rod (4) between expansion link and the body of heater and links to each other with the expansion link the other end constitutes, and pneumatic cylinder is fixed on the suspension bracket (8).

7, by claim 1 or the 2 described preheating oven devices that are used to make fibre-optical preform, it is characterized in that lifting hanger is made of suspension bracket (8) and lifting device, lifting device includes chain (16), fixed pulley (15), drive sprocket (18), one end and the suspension bracket of chain link, another termination counterweight (17) behind fixed pulley and drive sprocket, drive sprocket links with the drive unit (19) that has self-locking mechanism.