CN104197695A

CN104197695A - Vacuum furnace

Info

Publication number: CN104197695A
Application number: CN201410372411.3A
Authority: CN
Inventors: 廖红平; 廖秋平
Original assignee: HONGAN ANDA NEW MATERIALS Co Ltd
Current assignee: HONGAN ANDA NEW MATERIALS Co Ltd
Priority date: 2014-07-31
Filing date: 2014-07-31
Publication date: 2014-12-10

Abstract

The invention belongs to the field of process equipment for artificial diamonds and particularly relates to a vacuum furnace used for purifying raw materials. The vacuum furnace comprises a vacuum unit and a furnace body, wherein the vacuum unit is connected with the furnace body through a vacuum pipe. The furnace body comprises an inner container and an outer wall. A heat preservation cavity is arranged between the inner container and the outer wall. The heat preservation cavity is provided with an air inlet and an air outlet, wherein the air inlet and the air outlet are respectively provided with a valve. An air blower is arranged at the position of the air inlet. A heat insulation material is arranged on the inner side of the outer wall. A plurality of heating assemblies are evenly distributed on the outer side of the inner container. Each heating assembly is connected with a temperature control meter used for displaying temperature. A plurality of trays are arranged in the inner container. A plurality of through holes are evenly formed in each tray. A cover plate provided with a seal ring is arranged at the position of the opening of the inner container. The vacuum unit is communicated with the inner container through the vacuum pipe. According to the vacuum furnace, the purifying effect is good, rapid cooling can be conducted after purification is completed, the operation period is short, secondary pollution is avoided, the structure is simple, and the service life is long.

Description

A kind of vacuum drying oven

Technical field

The invention belongs to diamond process equipment field, be specially a kind of for by the vacuum drying oven of feedstock purification.

Background technology

Diamond not only can be processed into priceless jewelry, in industry, is also well worth doing.Its hardness is high, wearability good, can be widely used in cutting, grinding, probing; Because thermal conductivity is high, electrical insulating property is good, can be used as the heat sink of semiconductor device; It has good light transmission and corrosion resistance, in electronics industry, is also used widely.

Mainly that graphite is prepared diamond at present, before preparation, generally need to such as, improve the conversion ratio of graphite to the certain catalyst (Fe, Ni etc.) of graphite powder the inside interpolation, but catalyst under conventional environment often easily by environmental oxidation, cause the purity of catalyst to reduce, affect the preparation of diamond.

Summary of the invention

The object of the invention is to overcome above-mentioned deficiency, a kind of vacuum drying oven is provided, can realize the feedstock purification before diamond preparation, ensure efficiently normally carrying out of production.

For realizing above-mentioned technical purpose, scheme provided by the invention is: a kind of vacuum drying oven, comprise the vacuum unit and the body of heater that are connected by vacuum tube, described body of heater comprises inner bag and outer wall, it between inner bag and outer wall, is heat insulation cavity, this heat insulation cavity arranges the valvular air inlet of tool and exhaust outlet, air inlet place is provided with air blast, outer wall inner side arranges insulation material, inner bag outside is uniformly distributed some heating components, each heating component connects the temp controlled meter for displays temperature, inner bag inside arranges some pallets, each pallet is uniformly distributed some through holes, the opening part setting of inner bag has the cover plate of sealing ring, vacuum unit is by vacuum tube and inner bag internal communication.

And described heating component comprises the resistance wire coiling in the shape of a spiral in inner bag outside, and inner bag arranged outside is held this resistance wire groove.

And described resistance wire is containing molybdenum resistance wire.

And the sealing ring place on described cover plate arranges water-cooling circular tube.

Refining effect of the present invention is good, can fast cooling after having purified, and duty cycle is short, and secondary pollution can not occur, simple in structure, long service life.

Brief description of the drawings

Fig. 1 is structural representation of the present invention.

Fig. 2 is inner bag outboard structure schematic diagram.

Fig. 3 is the A-A face structural representation of Fig. 1.

Wherein, 1, body of heater, 2, inner bag, 3, outer wall, 4, vacuum unit, 5, vacuum tube, 6, heat insulation cavity, 7, air inlet, 8, exhaust outlet, 9, air blast, 10, insulation material, 11, temp controlled meter, 12, pallet, 13, through hole, 14, cover plate, 15, sealing ring, 16, water-cooling circular tube, 17, resistance wire.

Detailed description of the invention

Below in conjunction with drawings and Examples, the invention will be further described.

The present embodiment provides a kind of vacuum drying oven, as shown in Fig. 1 ~ Fig. 3, comprise the vacuum unit 4 and the body of heater 1 that are connected by vacuum tube 5, described body of heater 1 comprises inner bag 2 and outer wall 3, between inner bag 2 and outer wall 3, it is heat insulation cavity 6, this heat insulation cavity 6 arranges the valvular air inlet 7 of tool and exhaust outlet 8, air inlet 7 places are provided with air blast 9, outer wall 3 inner sides arrange insulation material 10, inner bag 2 outsides are uniformly distributed some heating components, each heating component connects the temp controlled meter 11 for displays temperature, inner bag 2 inside arrange some pallets 12, each pallet 12 is uniformly distributed some through holes 13, can ensure the heat exchange effect of inner bag 2 inside.The opening part setting of inner bag 2 has the cover plate 14 of sealing ring 15, and vacuum unit 4 is by vacuum tube 5 and inner bag 2 internal communication.

Further, described heating component comprises the resistance wire 17 coiling in the shape of a spiral in inner bag 2 outsides, and inner bag 2 arranged outside are held this resistance wire 17 grooves.Can provide support power for resistance wire 17, abandon the design that resistance wire 17 drops naturally in the past, can effectively avoid the resistance wire 17 pendants phenomenon of disconnection for a long time, greatly extend the service life of resistance wire 17.

Further, described resistance wire 17 is containing molybdenum resistance wire, can reach higher heating-up temperature, and longer service life.

Further, sealing ring 15 places on described cover plate 14 arrange water-cooling circular tube 16, can slow down the aging of sealing ring 15, extend its service life.

When the present invention uses, the mixture of graphite and catalyst is inserted on some pallets 12 of inner bag 2, cover cover plate 14 inner bag 2 is sealed, start vacuum unit 4 inner bag 2 is reduced pressure, until expection pressure keep this pressure.The valve of closing heat insulation cavity 6 two ends air inlets 7 and exhaust outlet 8, heating component heats inner bag 2, until desired temperature, can be by temp controlled meter 11 readings.Oxidized catalyst is in the environment of such high temperature, low pressure, more easily be reduced agent---graphite reduction, and reduce more fully, and after completing, operation can obtain the mixture of highly purified catalyst and graphite, for changing into diamond, next step carries out adequate preparation.After operation, for accelerating the cooling of body of heater 1, can open the valve of heat insulation cavity 6 two ends air inlets 7 and exhaust outlet 8, form cross-ventilation cooling, and accelerate air-cooled speed by air blast 9.This air blast 9 can be arranged at air inlet 7 places, also can be arranged at exhaust outlet 8 places, or air inlet 7 and exhaust outlet 8 respectively arrange one.

The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvement or distortion, these improvement or distortion also should be considered as protection scope of the present invention.

Claims

1. a vacuum drying oven, comprise the vacuum unit and the body of heater that are connected by vacuum tube, it is characterized in that: described body of heater comprises inner bag and outer wall, it between inner bag and outer wall, is heat insulation cavity, this heat insulation cavity arranges the valvular air inlet of tool and exhaust outlet, air inlet place is provided with air blast, outer wall inner side arranges insulation material, inner bag outside is uniformly distributed some heating components, each heating component connects the temp controlled meter for displays temperature, inner bag inside arranges some pallets, each pallet is uniformly distributed some through holes, the opening part setting of inner bag has the cover plate of sealing ring, vacuum unit is by vacuum tube and inner bag internal communication.

2. a kind of vacuum drying oven according to claim 1, is characterized in that: described heating component comprises the resistance wire coiling in the shape of a spiral in inner bag outside, and inner bag arranged outside is held this resistance wire groove.

3. a kind of vacuum drying oven according to claim 2, is characterized in that: described resistance wire is containing molybdenum resistance wire.

4. a kind of vacuum drying oven according to claim 1, is characterized in that: the sealing ring place on described cover plate arranges water-cooling circular tube.