CN105803382A - Carburizing furnace for preventing thermocouple from being carburized and application - Google Patents
Carburizing furnace for preventing thermocouple from being carburized and application Download PDFInfo
- Publication number
- CN105803382A CN105803382A CN201610323871.6A CN201610323871A CN105803382A CN 105803382 A CN105803382 A CN 105803382A CN 201610323871 A CN201610323871 A CN 201610323871A CN 105803382 A CN105803382 A CN 105803382A
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- CN
- China
- Prior art keywords
- thermocouple
- carburizing
- pillar
- carburizer
- preventing
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/20—Carburising
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D11/00—Arrangement of elements for electric heating in or on furnaces
- F27D11/02—Ohmic resistance heating
Abstract
The invention relates to a carburizing furnace for preventing a thermocouple from being carburized and an application, and belongs to the field of deposition of carbon-carbon composite materials. The carburizing furnace comprises an outer furnace shell and a carburizing chamber located in the outer furnace shell; and a thermocouple mounting hole is formed in the outer furnace shell, the carburizing chamber is provided with a carburizing chamber hole, the thermocouple penetrates the thermocouple mounting hole and the carburizing chamber hole to be arranged, a protection tube is arranged on the carburizing chamber hole, and the protection tube is a hollow body with an opening in one end. Through the protection tube, contact between the thermocouple and gas in the carburizing chamber is isolated, the problems that in the production process, due to carburizing cracks of the thermocouple, inlet gas and graphite pieces in the furnace are oxidized, after nickel chrome wires are carburized, the specific resistance is affected, and temperature measuring and gas leakage risks are caused are solved, and the service life of the furnace is several tens of times of the service life of an original furnace.
Description
Technical field
The present invention relates to a kind of carburizer preventing thermocouple carburizing and application, belong to carbon carbon composite deposition field.
Background technology
The thermocouple that the vacuum cementation furnace of current domestic carbon carbon composite 850 DEG C to 1100 DEG C uses is nichrome thermocouple; stainless steel tube is had outward to completely cut off the protection set of vacuum and carbon atmosphere as thermocouple; in carburizing process easily because of stainless steel tube in reaction chamber and hydrocarbon atmosphere the phenomenons such as carburizing be full of cracks occur between rustless steel crystal; behind so-called intercrystalline corrosion crack; the rustless steel of intercrystalline corrosion; when being stressed effect; namely intercrystalline fracture, intensity being almost wholly absent, this is stainless the most dangerous a kind of failure mode.Intercrystalline corrosion can produce respectively in the heat affected area of welding point, weld seam or melt run, the intercrystalline corrosion produced in melt run, also known as knife-line attack, occurs in production process that in stove, air inlet causes graphite piece to aoxidize or affect resistivity after nickel filament carburizing causing that thermometric ten to tens spends deviation.There is very big gas leakage or overtemperature risk in production process, uses time advance replacing thermocouple to avoid risk by summing up at present.
Chinese patent document (notification number CN202485822U) discloses a kind of thermocouple for carburization process, including thermocouple body and be enclosed within the heat resisting steel pillar outside thermocouple body, inside and outside layer corundum ceramic pillar it is additionally provided with between heat resisting steel pillar and thermocouple body, to stoping carbon atom to penetrate into thermocouple, reduce the probability of thermocouple initial failure.But the technical scheme of this document is only the structure to thermocouple to be improved; thermocouple installs aluminium oxide two-layer and one layer of heat resisting steel additional; cost is of a relatively high; thermocouple is as integrated marketing; it is unfavorable for changing and using, also has because of the problems such as the thermometric that causes is slow that use multilamellar protection material thermal conductivity rate to decline, the operating accuracy of thermocouple is also had impact; the material heat resisting steel itself used does not possess anti-carburizing energy, the problem that yet there will be carburizing fracture on certain time；Corundum pillar has certain advantage in heatproof, but corundum equally also carburizing crack can occur after heat-resisting firm pipe damages, and when heat resisting steel reaches more than 1100 DEG C, under the environment of hydrocarbon gas, carburizing is violent in process of production.
Do not occur preventing the secondary protection tube of carburizing in current industry, the material that thermocouple employs up to is aluminium oxide, rustless steel, heat resisting steel 310S thermocouple, thermocouple directly contacts with hydrocarbon gas at reative cell, all can not effectively avoid the tube wall of thermocouple and weld carburizing crack performance occur at present.In process of production, still occur the problem that because of carburizing, thermocouple material occurs that outside air is directly sucked in stove and causes that graphite piece aoxidizes by crack vacuum；Affect resistivity after thermocouple pipe wall crack after hydrocarbon gas infiltration nickel filament carburizing and cause that thermocouple temperature measurement has ten to tens degree deviations, affect explained hereafter；Service life is short, within every 300 hours in high-temperature carburizing, occurs as soon as thermocouple carburizing crack and the phenomenon such as snaps, causes and scrap, cost up.
Summary of the invention
For the deficiencies in the prior art, the present invention provides a kind of carburizer preventing thermocouple carburizing, solves thermocouple carburizing problem structure.
The present invention also provides for a kind of application process applying above-mentioned carburizer.
Technical scheme is as follows:
A kind of carburizer preventing thermocouple carburizing, including outer furnace shell and the carburizing room being positioned at outer furnace shell, outer furnace shell is provided with thermocouple mounting hole, carburizing room is provided with carburizing room hole, thermocouple runs through thermocouple mounting hole and carburizing room hole is arranged, hole place, carburizing room is provided with pillar, and pillar is the hollow body of one end open.By pillar, completely cut off contacting of thermocouple and carburizing indoor gas.
According to currently preferred, described carburizing room hole is located at carburizing ceiling portion.Corresponding pillar is also located at carburizing ceiling portion, to facilitate installation and to change.
According to currently preferred, described pillar is the pillar that graphite is made.
According to currently preferred, described pillar one end open place is provided with boss.Conveniently pillar is installed on the locular wall of carburizing room, simultaneously facilitates installation and change.
According to currently preferred, described pillar is the hollow cylinder of one end open.
It is further preferred that pillar external diameter is 50mm, internal diameter is 40mm, deeply for 300mm.
According to currently preferred, between described thermocouple mounting hole and thermocouple, it is provided with sealing shroud.
It is further preferred that sealing shroud includes sleeve pipe, sleeve pipe is fixing with outer furnace shell to be connected, and thermocouple is provided with ring flange, is provided with sealing ring between ring flange and sleeve pipe, and ring flange is connected with sleeve bolt.Ring flange is made to be anchored on sleeve pipe by bolt and nut.
According to currently preferred, it is connected for interference between pillar with carburizing room hole.Pillar is that nested type is sealedly connected on the locular wall of carburizing room to prevent from running carbon.
A kind of method applying the above-mentioned carburizer preventing thermocouple carburizing, as follows including step, whether the thermocouple mounting hole first checking for outer furnace shell is concentric with the pillar at hole place, carburizing room, if not concentric, then it is adjusted to one heart, if with one heart, plumb thermocouples in pillar, then the ring flange on thermocouple is compressed sealing ring, by ring flange with telescopic joint, to carburizer evacuation pressurize after fastening.
According to currently preferred, plumb thermocouples in pillar until thermocouple contacts bottom pillar.
The present invention utilizes TRIZ inventive principle Su-field models method, increase another Su-field models and solve secondary protection tube and thermocouple carburizing problem, according to one semi-enclosed graphite oversheath of stove design in stove, the space that a thermocouple is flexible is isolated, by completely separated to thermocouple and reaction chamber atmosphere at hydrocarbon gas reative cell and carburizing room.
The technical program may utilize the various stoves of composite carburizer isolation thermocouple and the carburizing room isolation using nickel chromium triangle thermocouple less than 1150 DEG C.
The beneficial effects of the present invention is:
Technical scheme avoids thermocouple to use the impact of environment carburizing by high temperature increasing this frame mode of thermocouple well, because thoroughly thermocouple and reaction chamber being separated, solve in production process because thermocouple carburizing is chapped, air inlet in the stove caused, graphite piece oxidation, affect after nickel filament carburizing resistivity cause thermometric, risk of leaking gas, be tens times of former mode service life.
A kind of version (carburizing time 300 hour/time) that the thermocouple mounting structure of the present invention uses suitable in composite production equipment, it is characterized as being at carburizing room furnace chamber graphite-pipe completely isolated, thermocouple need not be changed and cost is low, make the thermocouple in this programme and in pillar local environment without carbon-source gas.
Accompanying drawing explanation
Fig. 1 is the schematic top plan view of carburizer of the present invention；
Fig. 2 be in Fig. 1 AA to sectional view；
Wherein, 1, thermocouple, 2, sealing shroud, 3, outer furnace shell, 4, pillar, 5, carburizing room.
Detailed description of the invention
The present invention will be further described by the examples below and in conjunction with accompanying drawing, but is not limited to this.
As shown in Fig. 12.
Embodiment 1:
A kind of carburizer preventing thermocouple carburizing, including outer furnace shell and the carburizing room being positioned at outer furnace shell, outer furnace shell is provided with thermocouple mounting hole, carburizing ceiling portion is provided with carburizing room hole, thermocouple runs through thermocouple mounting hole and carburizing room hole is arranged, hole place, carburizing room is provided with pillar, pillar is the pillar that graphite is made, pass through pillar, completely cut off contacting of thermocouple and carburizing indoor gas, pillar is the hollow cylinder of one end open, for semi-enclosed pillar, one is closed other end is uncovered, pillar one end open place is provided with boss, pillar is by the hollow cylinder emptied inside good 6650 graphite materials of heat conductivity to the external diameter 50mm deep 300mm of internal diameter 40mm.
Being connected for interference between pillar with carburizing room hole, pillar nested type is sealedly connected on the locular wall of carburizing room to prevent from running carbon.
Pillar blind end embeds carburizing room, pillar opening end stays carburizing outdoor, such hollow thermocouple part and carburizing room are isolated entirely from, due to graphite material excellent properties at high temperature, effectively prevent the impact of the key factors such as its material at high temperature heat-shock, the coefficient of expansion, heat conduction, carburizing.
Embodiment 2:
A kind of carburizer preventing thermocouple carburizing, its structure is as described in Example 1, it is distinctive in that, sealing shroud it is provided with between thermocouple mounting hole and thermocouple, sealing shroud includes sleeve pipe, and sleeve pipe is fixing with outer furnace shell to be connected, and thermocouple is provided with ring flange, being provided with sealing ring between ring flange and sleeve pipe, ring flange is connected with sleeve bolt.Ring flange is made to be anchored on sleeve pipe by bolt and nut.
Embodiment 3:
A kind of method of the carburizer preventing thermocouple carburizing described in Application Example 2, comprise the following steps that whether the thermocouple mounting hole first checking for outer furnace shell is concentric with the pillar at hole place, carburizing room, if it is not concentric, then it is adjusted to one heart, if with one heart, plumb thermocouples in pillar until bottom thermocouple contact pillar, then the ring flange on thermocouple being compressed sealing ring, by ring flange with telescopic joint, to carburizer evacuation pressurize after fastening.
Claims (10)
1. the carburizer preventing thermocouple carburizing, including outer furnace shell and the carburizing room being positioned at outer furnace shell, it is characterized in that, outer furnace shell is provided with thermocouple mounting hole, carburizing room is provided with carburizing room hole, thermocouple runs through thermocouple mounting hole and carburizing room hole is arranged, and hole place, carburizing room is provided with pillar, and pillar is the hollow body of one end open.
2. the carburizer preventing thermocouple carburizing according to claim 1, it is characterised in that described carburizing room hole is located at carburizing ceiling portion.
3. the carburizer preventing thermocouple carburizing according to claim 1, it is characterised in that described pillar is the pillar that graphite is made.
4. the carburizer preventing thermocouple carburizing according to claim 1, it is characterised in that described pillar one end open place is provided with boss.
5. the carburizer preventing thermocouple carburizing according to claim 1, it is characterised in that described pillar is the hollow cylinder of one end open；Preferably, pillar external diameter is 50mm, internal diameter is 40mm, deeply for 300mm.
6. the carburizer preventing thermocouple carburizing according to claim 1, it is characterised in that be provided with sealing shroud between described thermocouple mounting hole and thermocouple.
7. the carburizer preventing thermocouple carburizing according to claim 6, it is characterised in that sealing shroud includes sleeve pipe, sleeve pipe is fixing with outer furnace shell to be connected, and thermocouple is provided with ring flange, is provided with sealing ring between ring flange and sleeve pipe, and ring flange is connected with sleeve bolt.
8. the carburizer preventing thermocouple carburizing according to claim 1, it is characterised in that be connected for interference between pillar with carburizing room hole.
9. the application process of the carburizer preventing thermocouple carburizing applied described in claim 7, as follows including step, whether the thermocouple mounting hole first checking for outer furnace shell is concentric with the pillar at hole place, carburizing room, if not concentric, then it is adjusted to one heart, if with one heart, plumb thermocouples in pillar, then the ring flange on thermocouple is compressed sealing ring, by ring flange with telescopic joint, evacuation pressurize after fastening.
10. application process according to claim 10, it is characterised in that plumb thermocouples in pillar until thermocouple contacts bottom pillar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610323871.6A CN105803382A (en) | 2016-05-17 | 2016-05-17 | Carburizing furnace for preventing thermocouple from being carburized and application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610323871.6A CN105803382A (en) | 2016-05-17 | 2016-05-17 | Carburizing furnace for preventing thermocouple from being carburized and application |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105803382A true CN105803382A (en) | 2016-07-27 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610323871.6A Pending CN105803382A (en) | 2016-05-17 | 2016-05-17 | Carburizing furnace for preventing thermocouple from being carburized and application |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105803382A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110218966A (en) * | 2019-06-21 | 2019-09-10 | 南京高速齿轮制造有限公司 | Carburizer exhaust gas transmission pipe and its mounting structure |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2104997U (en) * | 1990-09-21 | 1992-05-20 | 盐城市锅炉厂 | Reciprocating fire grate sheets |
| CN202133483U (en) * | 2011-07-11 | 2012-02-01 | 金川集团有限公司 | Temperature measuring device used in reduction-distillation furnace reactor |
| CN203657433U (en) * | 2013-11-01 | 2014-06-18 | 湖南顶立科技有限公司 | Vacuum sintering furnace |
| CN203772042U (en) * | 2013-11-01 | 2014-08-13 | 湖南顶立科技有限公司 | Pluggable temperature measurement device arranged on high-temperature vacuum furnace |
| CN204574775U (en) * | 2015-04-29 | 2015-08-19 | 宁夏昇力恒真空设备有限公司 | There is the high-temperature vacuum sintering furnace of thermocouple automatic plugging device |
-
2016
- 2016-05-17 CN CN201610323871.6A patent/CN105803382A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2104997U (en) * | 1990-09-21 | 1992-05-20 | 盐城市锅炉厂 | Reciprocating fire grate sheets |
| CN202133483U (en) * | 2011-07-11 | 2012-02-01 | 金川集团有限公司 | Temperature measuring device used in reduction-distillation furnace reactor |
| CN203657433U (en) * | 2013-11-01 | 2014-06-18 | 湖南顶立科技有限公司 | Vacuum sintering furnace |
| CN203772042U (en) * | 2013-11-01 | 2014-08-13 | 湖南顶立科技有限公司 | Pluggable temperature measurement device arranged on high-temperature vacuum furnace |
| CN204574775U (en) * | 2015-04-29 | 2015-08-19 | 宁夏昇力恒真空设备有限公司 | There is the high-temperature vacuum sintering furnace of thermocouple automatic plugging device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110218966A (en) * | 2019-06-21 | 2019-09-10 | 南京高速齿轮制造有限公司 | Carburizer exhaust gas transmission pipe and its mounting structure |
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Application publication date: 20160727 |
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| RJ01 | Rejection of invention patent application after publication |