CN202254856U

CN202254856U - Sintering furnace

Info

Publication number: CN202254856U
Application number: CN 201120265094
Authority: CN
Inventors: 叶雷; 周健
Original assignee: CHONGQING RUNZE MEDICAL INSTRUMENTS Ltd
Current assignee: CHONGQING RUNZE MEDICAL INSTRUMENTS Ltd
Priority date: 2011-07-26
Filing date: 2011-07-26
Publication date: 2012-05-30
Anticipated expiration: 2021-07-26

Abstract

The utility model discloses a sintering furnace, which comprises a furnace shell 1, a furnace internal bracket 3, a heat preservation layer 4, a cooling gas feeding device and a cooling system, wherein ventilating holes are formed in the furnace internal bracket 3 and the heat preservation layer 4; and the cooling system and a furnace cavity formed in the furnace shell 1 are communicated with each other to form a closed loop. The sintering furnace with the structure has an outstanding cooling effect in a sintering cooling stage; furthermore, the sintering cooling time and the whole sintering period are shortened greatly; the utilization rate and the production efficiency of the sintering furnace are improved; and therefore, the yield and the benefit of products are greatly increased.

Description

Sintering furnace

Technical field

The utility model relates to a kind of sintering furnace, relates in particular to a kind of sintering furnace that can realize quick cooling.

Background technology

The sintering process of sintering furnace is divided into preheating, burns till and cools off several stages usually.At present, sintering furnace is taked the mode with stove cooling usually at cooling stage, in stove, feeds cooling water and realizes slow cooling.

Chinese patent CN201289290Y has announced a kind of " fast cooling type Medium frequency induction sintering furnace "; The circulating cooling system that this sintering furnace has adopted a cover to be made up of radiator, circulating fan, pipeline and passage; When furnace temperature is reduced to below 800 ℃, can open this system, realize the quick cooling of low temperature temperature-fall period.This sintering furnace can shorten the cool time of low temperature temperature-fall period, has shortened the sintering period to a certain extent.But the high temperature temperature-fall period that is positioned at more than 800 ℃ in furnace temperature still need adopt the water-cooling pattern cooling, and whole cooling stage still needs the labor time, and the production cycle is still longer, and the performance of sintering furnace production capacity still receives severely restricts.For example in the superhigh temperature sintering process to tantalum class refractory metal, because holding temperature is high, the high temperature temperature-fall period is long, and this sintering furnace can not make fully shortened total cool time.

The utility model content

To the above-mentioned defective that prior art exists, the utility model aims to provide a kind of sintering furnace that is specially adapted to refractory metals such as tantalum class that can realize quick cooling.

To achieve these goals, the utility model adopts following technical scheme: sintering furnace comprises furnace shell, stove inner support, heat-insulation layer, refrigerating gas access equipment and cooling system, and said stove inner support and heat-insulation layer are provided with passage; Said cooling system can be communicated with the formation closed-loop path with the furnace chamber that said furnace shell forms.

As the improvement to the present technique scheme, said cooling system comprises the cooling circuit that is connected with cold-producing medium.

Compare with prior art; The utility model is owing to adopted technique scheme; Cooling effect to sintering furnace is outstanding, has shortened sintering cool time and whole sintering period greatly, has overcome the restriction of sintering period length to the production capacity performance; Improve the utilization rate and the production efficiency of sintering furnace, thereby increased the output and the benefit of product greatly.

Description of drawings

Fig. 1 is the structural representation of the utility model embodiment;

Fig. 2 is the floor map of the cooling system of the utility model embodiment employing;

Fig. 3 is the elevational schematic view of the cooling system of the utility model embodiment employing.

The specific embodiment

Through embodiment the utility model is carried out concrete description below; Be necessary to be pointed out that at this following examples only are used for the utility model is further explained; Can not be interpreted as the restriction to the utility model protection domain, those skilled in the art can make some nonessential improvement and adjustment to the utility model according to foregoing.

Embodiment: a kind of sintering furnace, as shown in Figure 1, this sintering furnace comprises furnace shell 1, stove support arm 2, stove inner support 3, heat-insulation layer 4, upper vent hole 5 and following passage 6.Furnace shell 1 is supported by stove support arm 2, and furnace shell 1 has constituted furnace chamber.Heat-insulation layer 4 is positioned on the supporting plate of stove inner support 3, and upper vent hole 5 is arranged on the heat-insulation layer 4, and following passage 6 is arranged on the supporting plate of stove inner support 3.

Furnace shell 1 outside is connected to furnace chamber escape pipe 7.Furnace shell 1 bottom is connected to furnace chamber air inlet pipe 9, and furnace chamber air inlet pipe 9 is passed furnace shell 1 bottom and linked to each other with following passage 6.

Furnace chamber links to each other with a cooling system.Cooling system air inlet pipe 10 is connected through control valve 11 with sintering furnace escape pipe 7.The escape pipe 12 of cooling system, the air inlet pipe 9 of furnace chamber are connected through triple valve 13 with the refrigerating gas access equipment.Have air bleeding valve 8 on the escape pipe 12.Refrigerating gas access equipment in the present embodiment is a hydrogen pump 14.

As shown in Figures 2 and 3, this cooling system is placed on the support 15, is made up of compressor 16, condenser 17, choke valve 19, evaporimeter 20, induced-draught fan 18, exhaust blower 21 and housing 22.The enclosure space that housing 22 constitutes is divided into the chamber 24 and chamber 25 that communicates with each other by dividing plate 23.Compressor 16 is arranged in chamber 24, and condenser 17 is positioned at housing 22 outsides, and remaining part all is arranged in chamber 25.Compressor 16, condenser 17, choke valve 19 and evaporimeter 20 link to each other through pipeline successively and constitute cooling circuit.Circulation has cold-producing medium in the cooling circuit.Induced-draught fan 18 and exhaust blower 21 lay respectively at the above and below in chamber 25, and be relative respectively with cooling system air inlet pipe 10 and cooling system escape pipe 12.Induced-draught fan 18, evaporimeter 20 and exhaust blower 21 constitute the refrigerating gas path in order, and refrigerating gas is got into by induced-draught fan 18, after evaporimeter 20 carries out heat exchange, are discharged by exhaust blower 21 again.Cooling system is circumscribed with independently power source.Power source in the present embodiment is a power supply 26.

In the sintering process, close triple valve 13, control valve 11 and air bleeding valve 8 in preheating and the stage of burning till, cooling system and furnace chamber are not in connected state.Can keep the seal of furnace chamber like this, keep enough vacuum.

After the stage of burning till finishes, get into cooling stage.At this moment, open triple valve 13, control valve 11 and air bleeding valve 8.Open hydrogen pump 14, feed hydrogen as cooling medium.The hydrogen passage is: hydrogen pump 14 → triple valve 13 → furnace chamber air inlet pipe 9 → following passage 6 → upper vent hole 5 → furnace chamber escape pipe 7 → control valve 11 → cooling system air inlet pipe 10 → cooling system → cooling system escape pipe 12 → air bleeding valve 8., air bleeding valve 8 opening parts close hydrogen pump 14 and air bleeding valve 8 after detecting density of hydrogen, be up to standard.This moment, furnace chamber was communicated with cooling system and closure, constituted the hydrogen closed circuit.

Opening power 26; Under the effect of power supply 26; Behind the cold-producing medium boil down to high steam of compressor 16 with the low pressure gaseous state it is entered condenser 17; Warm highly pressurised liquid gets into choke valve 19 under the cooling effect of condenser 17, becoming, and under the hypotensive effect of choke valve 19, becomes low-temp low-pressure liquid again and gets into evaporimeter 20.In evaporimeter 20, cold-producing medium absorb heat because of volume increases suddenly evaporation, be reduced to low-pressure gas, get into the cool cycles of compressor 16 beginning new rounds once more.Because its physical characteristic, cold-producing medium will absorb a large amount of heat energy in evaporation process, cause evaporimeter 20 and peripheral gas that the heat exchange of big degree takes place.When cold-producing medium carried out cool cycles, induced-draught fan 18 sucked from the evaporimeter 20 of flowing through of the high hot hydrogen in the furnace chamber.Through in the flow process with the heat exchange of evaporimeter 20, hydrogen is able to lower the temperature significantly, then discharges cooling systems through exhaust blower 21, and gets into furnace chamber once more through cooling system escape pipe 12 and furnace chamber air inlet pipe 9.Hydrogen after the cooling gets into the high temperature furnace chamber once more, because altitude temperature difference effect will carry out heat exchange with furnace chamber, has realized reducing the purpose of furnace temperature.Hydrogen through heating up after the sufficient heat exchange is discharged furnace chamber through furnace chamber escape pipe 7, gets into cooling system once more and cools off.Through so moving in circles, hydrogen serves as the heat energy that cooling medium carries in the stove incessantly and drains into outside the stove, has realized the effect of rapid reduction furnace temperature.

Choke valve in the preferred present embodiment of throttling arrangement in the cooling system under the substantially invariable operating mode of temperature range, also can adopt capillary.Refrigerating gas also can adopt gases such as air, nitrogen except that the strong hydrogen of preferred thermal conductivity; The refrigerating gas access equipment also can be other devices beyond the hydrogen pump.In addition, also can change and improve other associated components in the present embodiment according to concrete sintering process flow process and actual condition.

Claims

1. sintering furnace; Comprise furnace shell (1), stove inner support (3), heat-insulation layer (4), refrigerating gas access equipment and cooling system; Said stove inner support (3) and heat-insulation layer (4) are provided with passage, it is characterized in that: said cooling system can be communicated with the formation closed-loop path with the furnace chamber that said furnace shell (1) forms.

2. sintering furnace as claimed in claim 1 is characterized in that: said cooling system comprises the cooling circuit that is connected with cold-producing medium.

3. sintering furnace as claimed in claim 2 is characterized in that: said cooling circuit is connected and composed by compressor (16), condenser (17), throttling arrangement and evaporimeter (20) in order; Said cooling system comprises the refrigerating gas path, and said refrigerating gas path is made up of induced-draught fan (18), evaporimeter (20) and exhaust blower (21) in order.

4. sintering furnace as claimed in claim 3 is characterized in that: said throttling arrangement is choke valve (19).

5. sintering furnace as claimed in claim 1 is characterized in that: said cooling system and said furnace chamber all are circumscribed with air inlet pipe and escape pipe; The air inlet pipe of said cooling system (10) links to each other with air inlet pipe (9) with the escape pipe (7) of said furnace chamber respectively through valve with escape pipe (12).

6. sintering furnace as claimed in claim 5 is characterized in that: the air inlet pipe (9) of the escape pipe of said cooling system (12), said furnace chamber is connected through triple valve (13) with said refrigerating gas access equipment.

7. sintering furnace as claimed in claim 1 is characterized in that: said cooling system is circumscribed with independently power source.

8. sintering furnace as claimed in claim 7 is characterized in that: said power source is power supply (26).