CN218238366U - Pre-sintering normal-pressure sintering furnace - Google Patents
Pre-sintering normal-pressure sintering furnace Download PDFInfo
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- CN218238366U CN218238366U CN202222546198.6U CN202222546198U CN218238366U CN 218238366 U CN218238366 U CN 218238366U CN 202222546198 U CN202222546198 U CN 202222546198U CN 218238366 U CN218238366 U CN 218238366U
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Abstract
The utility model discloses a pre-burning normal pressure sintering furnace, which comprises a furnace liner, a furnace shell, a heating pipe, a vacuum pump, a pressure gauge, a graphite dewaxing pipe, an exhaust fan and a nitrogen tank; the furnace liner is positioned in the furnace shell, and a cavity is arranged between the furnace liner and the furnace shell; the heating pipes are uniformly arranged in the furnace pipe, the vacuum pump is communicated with a cavity between the furnace pipe and the furnace shell through a pipeline, and the pressure gauge is arranged on the furnace shell; one end of the graphite dewaxing pipe is communicated with the cavity in the furnace pipe, and the other end of the graphite dewaxing pipe extends out of the furnace shell; the exhaust fan is communicated with the furnace pipe through a pipeline and is used for discharging foreign matters in the furnace pipe; the nitrogen tank is communicated with the cavity between the furnace liner and the furnace shell through a pipeline and is used for introducing nitrogen into the cavity. The utility model has the advantages that: the furnace courage oxidation that leads to because of the carbon felt jam in the furnace courage that many times sintering leads to has been solved to the ordinary pressure fritting furnace of presintering, the vacuum pump blocks up the scheduling problem, has prolonged the life of furnace courage.
Description
Technical Field
The utility model belongs to the technical field of the fritting furnace sintering, concretely relates to ordinary pressure fritting furnace of presintering.
Background
The existing presintering sintering is sintering in a vacuum state, and a large amount of foreign matters discharged by presintering sintering at each time are partially adhered to a furnace pipe, so that an insulating layer is oxidized, the insulating effect of the furnace pipe is greatly reduced, and the product is very easy to oxidize. If the foreign matters are adhered to the heating pipe, the heating is not uniform, and the rejection rate of the product is improved. And the heating pipe is easy to damage, the heat preservation effect is poor, and the power consumption is high. The furnace pipe and the heating pipe are very complicated to replace, time-consuming and labor-consuming, and the damage is very easy to cause, so that the production cost is too high.
When presintering sintering, need open the vacuum pump, there will be a large amount of foreign matters this moment and can lead to the jam of vacuum pump along with drawing the vacuum pipe to lead to unable continuation sintering, whole stove product all can possibly scrap, in case the vacuum pump damages and blocks up under the high temperature condition, can produce the explosion so to have serious influence to production safety when serious.
SUMMERY OF THE UTILITY MODEL
The main aim at of this application provides one kind and changes vacuum sintering into the sintering of aerifing, and can solve because of the carbon felt blocks up and leads to the stove courage oxidation in the sintering stove courage many times, the vacuum pump blocks up, the easy damage problem's of heating pipe normal pressure sintering stove of presintering.
In order to achieve the above object, the present invention provides the following technical solutions:
a pre-sintering normal pressure sintering furnace comprises a furnace liner, a furnace shell, a heating pipe, a vacuum pump, a pressure gauge, a graphite dewaxing pipe, an exhaust fan and a nitrogen tank;
the furnace liner is positioned in the furnace shell, and a cavity is arranged between the furnace liner and the furnace shell; the heating pipes are uniformly arranged in the furnace pipe, the vacuum pump is communicated with a cavity between the furnace pipe and the furnace shell through a pipeline, and the pressure gauge is arranged on the furnace shell; one end of the graphite dewaxing pipe is communicated with the cavity in the furnace liner, and the other end of the graphite dewaxing pipe extends out of the furnace shell;
the exhaust fan is communicated with the furnace pipe through a pipeline and is used for discharging foreign matters in the furnace pipe;
and the nitrogen tank is communicated with the cavity between the furnace liner and the furnace shell through a pipeline and is used for introducing nitrogen into the cavity.
When the pre-burning normal-pressure sintering furnace is used, a vacuum pump is started during sintering of the pre-burning furnace, a vacuum valve is started again to pull vacuum to-0.1 MPa, and then the vacuum pump and the vacuum valve are closed. Starting heating, starting a nitrogen tank valve and a switch valve (filling nitrogen) to quickly fill to-0.02 MPa, then regulating to micro-filling, starting an exhaust fan and the switch valve (exhaust valve) to exhaust, closing the air filling when the sintering temperature reaches 800 ℃, closing the exhaust fan and the switch valve, starting a vacuum pump, starting a vacuum valve to pull vacuum to-0.1 MPa, and stopping heating and closing the vacuum pump and the vacuum valve.
Because nitrogen is flushed in the sintering process, the furnace pipe is protected by adding the nitrogen, the oxidation of the furnace pipe can be prevented, and the flushing of the nitrogen is beneficial to uniform heating and product oxidation prevention. Because of the carbon felt that the product sintering came out can be discharged together when exhausting air in the exhaust process, carbon felt and nitrogen gas are discharged through the fan together (nitrogen gas accessible furnace courage shell infiltrates in the furnace courage), cooperate double-barrelled dewaxing device again, can play fine guard action to furnace courage and vacuum pump, prevent that the vacuum pump from blockking up.
In the pre-burning normal pressure sintering furnace, as a preferred embodiment, a sealing ring is arranged at the contact position of the pipeline and the furnace shell.
The sealing ring can be fixed (bonded) on the furnace shell to prevent the air leakage at the joint of the pipeline and the furnace shell.
In the pre-sintering normal-pressure sintering furnace, as a preferred embodiment, the pipeline which is positioned inside the furnace shell and is communicated with the exhaust fan and the furnace liner is a graphite pipeline.
As a preferred embodiment, the first switch valve is arranged on a pipeline communicating the exhaust fan and the furnace pipe.
As a preferred embodiment, the pipeline for communicating the nitrogen tank and the furnace shell is provided with a second switch valve.
As a preferred embodiment, the internal diameter of the pipeline for communicating the exhaust fan and the furnace pipe is 8-10cm.
In the pre-sintering atmospheric pressure sintering furnace, as a preferred embodiment, the inner diameter of the pipeline communicating the nitrogen tank and the furnace shell is 2-3cm.
The beneficial effects of the utility model are that: the intercommunication has exhaust fan and nitrogen gas jar on the ordinary pressure fritting furnace of presintering, changes traditional vacuum sintering into and aerifys the sintering, can make the nitrogen gas atmosphere prevent that stove courage and product from by the oxidation during the sintering, and the carbon felt that produces when nitrogen gas and sintering passes through the exhaust fan and discharges, prevents to block up the vacuum pump. The problems of oxidation of the furnace, blockage of a vacuum pump and the like caused by blockage of the carbon felt in the furnace due to multiple sintering are solved, and the service life of the furnace is prolonged.
The 70 furnaces of presintering normal pressure sintering furnace are changed once in the use, and the 20 furnaces of current sintering furnace just need to be changed once, have prolonged the life of stove courage greatly.
Drawings
Fig. 1 is a schematic structural diagram of the pre-sintering normal pressure sintering furnace of the present invention;
in the figure: 1. a furnace pipe; 2. a furnace shell; 3. heating a tube; 4. a vacuum pump; 5. a pressure gauge; 6. a graphite dewaxing pipe; 7. an exhaust fan; 8. a nitrogen tank; 9. a first on-off valve; 10. and a second switch valve.
Detailed Description
In order to make the technical solutions in the embodiments of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to examples, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.
A pre-sintering normal-pressure sintering furnace comprises a furnace pipe 1, a furnace shell 2, a heating pipe 3, a vacuum pump 4, a pressure gauge 5, a graphite dewaxing pipe 6, an exhaust fan 7 and a nitrogen tank 8; the furnace container 1 is positioned in the furnace shell 2, and a cavity is arranged between the furnace container 1 and the furnace shell 2; the heating pipes 3 are uniformly arranged in the furnace pipe 1, the vacuum pump 4 is communicated with a cavity between the furnace pipe 1 and the furnace shell 2 through a pipeline, and the pressure gauge 5 is arranged on the furnace shell 2; one end of the graphite dewaxing pipe 6 is communicated with the cavity in the furnace pipe 1, and the other end of the graphite dewaxing pipe 6 extends out of the furnace shell 2; the exhaust fan 7 is communicated with the furnace pipe 1 through a pipeline and is used for exhausting foreign matters in the furnace pipe 1; the nitrogen tank 8 is communicated with a cavity between the furnace pipe 1 and the furnace shell 2 through a pipeline and is used for introducing nitrogen into the cavity.
When the pre-sintering normal-pressure sintering furnace is used, the vacuum pump 4 is started during sintering of the pre-sintering furnace, the vacuum valve is started again to pull vacuum until the pressure reaches-0.1 MPa, in order to prevent carbon felts generated in the sintering process from blocking the vacuum pump 4, the vacuum pump 4 and the vacuum valve are closed, then a heating and opening nitrogen tank 8 valve and a second switch valve 10 on a pipeline communicating the nitrogen tank 8 with the furnace shell 2 are started, a sealing ring is arranged on the pipeline in order to prevent air leakage, and the diameter of the pipeline can be 2cm, 2.5cm or 3cm.
The pressure in the furnace shell 2 is quickly flushed to-0.02 MPa, then the pressure is adjusted to be slightly charged, the exhaust fan 7 and a first valve communicated with a pipeline between the exhaust fan 7 and the furnace container 1 are opened to exhaust (discharge nitrogen and carbon felt generated in the sintering process), the pipeline positioned in the furnace shell 2 and communicated with the exhaust fan 7 and the furnace container 1 is a graphite pipeline, and the inner diameter of the pipeline can be 8cm, 9cm or 10cm.
And (3) closing the second switch valve 10 to stop charging when the temperature in the furnace pipe 1 is sintered to 800 ℃, opening the vacuum pump 4 and the vacuum valve, pulling the vacuum until the pressure is minus 0.1MPa until the heating is finished, and closing the vacuum pump 4 and the vacuum valve, wherein the exhaust fan 7 and the first switch valve 9 are arranged on the pipe wall.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and additions can be made without departing from the method of the present invention, and these improvements and additions should also be regarded as the protection scope of the present invention.
Claims (7)
1. The pre-sintering normal-pressure sintering furnace is characterized by comprising a furnace container, a furnace shell, a heating pipe, a vacuum pump, a pressure gauge, a graphite dewaxing pipe, an exhaust fan and a nitrogen tank;
the furnace liner is positioned in the furnace shell, and a cavity is arranged between the furnace liner and the furnace shell; the heating pipes are uniformly arranged in the furnace pipe, the vacuum pump is communicated with a cavity between the furnace pipe and the furnace shell through a pipeline, and the pressure gauge is arranged on the furnace shell; one end of the graphite dewaxing pipe is communicated with the cavity in the furnace liner, and the other end of the graphite dewaxing pipe extends out of the furnace shell;
the exhaust fan is communicated with the furnace pipe through a pipeline and is used for discharging foreign matters in the furnace pipe;
and the nitrogen tank is communicated with the cavity between the furnace liner and the furnace shell through a pipeline and is used for introducing nitrogen into the cavity.
2. The pre-sintering atmospheric pressure sintering furnace of claim 1, wherein a sealing ring is arranged at the contact part of the pipeline and the furnace shell.
3. The pre-sintering atmospheric pressure sintering furnace according to claim 1, wherein the duct inside the furnace shell and communicating the exhaust fan and the furnace bladder is a graphite duct.
4. The pre-sintering atmospheric pressure sintering furnace of claim 1, wherein a first switch valve is disposed on a pipe connecting the exhaust fan and the furnace.
5. The pre-sintering atmospheric pressure sintering furnace according to claim 1, wherein a second switch valve is provided on a pipe communicating the nitrogen tank and the furnace shell.
6. The prefiring atmospheric sintering furnace of claim 1, wherein the internal diameter of the duct connecting the exhaust fan and the furnace is 8-10cm.
7. The pre-sintering atmospheric pressure sintering furnace according to claim 1, wherein an inner diameter of a pipe communicating the nitrogen tank and the furnace shell is 2 to 3cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222546198.6U CN218238366U (en) | 2022-09-26 | 2022-09-26 | Pre-sintering normal-pressure sintering furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222546198.6U CN218238366U (en) | 2022-09-26 | 2022-09-26 | Pre-sintering normal-pressure sintering furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218238366U true CN218238366U (en) | 2023-01-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222546198.6U Active CN218238366U (en) | 2022-09-26 | 2022-09-26 | Pre-sintering normal-pressure sintering furnace |
Country Status (1)
| Country | Link |
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| CN (1) | CN218238366U (en) |
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- 2022-09-26 CN CN202222546198.6U patent/CN218238366U/en active Active
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