TWM626067U - Conductive crucible high-temperature evaporator heated by plasma transferred arc - Google Patents

Abstract

This creation discloses a conductive crucible high-temperature evaporator heated by a plasma transfer arc, which includes a casing, a conductive crucible, a transfer arc gun and a power source. The conductive crucible includes a crucible body and a crucible cover. The bottom wall of the crucible body is provided with an air inlet. one side of the air inlet cavity is communicated with the inner cavity of the crucible body through several carrier gas input preheating channels, and the ends of several air guide channels connected to the other side of the air inlet cavity all extend to the outside of the shell. A conductive rod is connected between the bottom of the main body and the bottom of the shell, and the transfer arc gun is installed above the shell and its lower end extends to the inside of the crucible cover. The invention has simple structure and high internal heating temperature, and is suitable for preparing powder from materials with high boiling point.

Description

Conductive Crucible High Temperature Evaporator Using Plasma Transfer Arc Heating

This creation relates to the field of high-temperature evaporators, in particular to a conductive crucible high-temperature evaporator heated by a plasma transfer arc.

When preparing various powders by the vapor-condensation gas-phase method, a high-temperature evaporator is required. The existing high-temperature evaporators mostly use electric heating, such as intermediate frequency heating, resistance heating and plasma arc heating, etc., or several heating methods are used in combination, and laser heating is also used in some special fields. Different heating methods have different requirements on the structure of the high temperature evaporator. For example, intermediate frequency heating requires the crucible or the heated body in the crucible to conduct electricity, and the heating structure is installed around the outside of the crucible. For another example, resistance heating requires good temperature resistance of its own structure. The heating structure can be installed at the bottom or the periphery of the crucible, or a heating structure inserted into the heated body can be installed at the top of the crucible to realize contact heating. For another example, in plasma arc heating, the plasma arc generated between the electrodes needs to be sprayed downward from above the high-temperature evaporator, and the object to be heated is arranged below the plasma arc. The structure of the plasma non-transferred arc high temperature evaporator is relatively simple, and the raw material can be directly sprayed into the middle of the arc without the need for a crucible. The raw material is heated when passing through the plasma non-transferred arc, but the input energy is relatively small. The plasma transfer arc requires two electrodes spaced apart, the plasma transfer arc gun is the cathode, and the heated body is the anode. The advantages of this heating structure are high heating energy and high temperature inside the high-temperature evaporator, especially suitable for boiling point. It is used when the high material is prepared into powder, but the structure is more complicated.

In view of the deficiencies in the background technology, the present invention provides a conductive crucible high-temperature evaporator with a simple structure and suitable for preparing powder from a material with a high boiling point, which is heated by a plasma transfer arc.

In order to achieve the above purpose, the technical solution of this creation is as follows:

A conductive crucible high-temperature evaporator heated by plasma transfer arc includes a shell, a conductive crucible, a transfer arc gun and a power source, the conductive crucible is arranged in the inner cavity of the shell, and the conductive crucible includes a crucible body and a The crucible cover above the crucible body is provided with an air inlet cavity in the bottom wall of the crucible body. Several air guide channels are connected, the ends of the several air guide channels all extend to the outside of the casing, a conductive rod is connected between the bottom of the crucible body and the bottom of the casing, and the transfer arc gun is installed above the casing And the lower end of the transfer arc gun extends to the inner side of the crucible cover, and the transfer arc gun and the conductive rod are respectively electrically connected with the power source.

Optionally, the casing includes a lower barrel disposed outside the crucible body and an upper cover disposed outside the crucible cover, the upper cover is mounted on the upper end of the lower barrel, between the lower barrel and the crucible body, and between the upper cover and the crucible cover. All rooms are provided with insulation layers. The thermal insulation layer can be made of high temperature resistant felt material or ceramic material.

Optionally, both the lower barrel body and the upper cover are provided with a jacket structure, and the jacket structure is connected to an extracorporeal circulation cooling liquid system arranged outside the casing.

Optionally, the material of the conductive crucible is a high temperature resistant conductive material such as metal or graphite.

Optionally, the inner cavity of the crucible body is a concave structure with a large upper and a small lower, and the inner cavity of the crucible cover is a dome-shaped or frustum-shaped structure with a large lower and a smaller upper.

Optionally, insulating ventilation gaps are provided between the transfer arc gun and the crucible cover and between the transfer arc gun and the housing, and the width of the insulating ventilation gap is 5-50 mm.

Optionally, the upper end of the casing is further provided with a feeding channel, a gas outlet and liquid return channel, and several observation ports for inspection and observation.

Optionally, the bottom end face of the nozzle of the transfer arc gun is located at a distance of -150mm to +150mm from the upper end face of the crucible body.

Optionally, the shape of the air inlet cavity is a circular ring or a fan ring, and the number of air guide channels is 1-18.

Optionally, a plurality of the carrier gas input preheating channels are distributed on the side wall of the crucible body in a fan ring shape, and the carrier gas input preheating channels are communicated with the carrier gas inlet at the connection point of the inner cavity of the crucible body, and the carrier gas inlet is connected. The height is 5-50mm.

Compared with the prior art, the beneficial effects of this creation are as follows:

The invention is simple in structure and reasonable in design; and has a high internal heating temperature, which is suitable for preparing powders from materials with high boiling points, and has broad market prospects.

The technical solutions in the creative embodiment will be clearly and completely described below with reference to the accompanying drawings in the creative embodiment. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments.

In the description of this creation, it is to be understood that the terms "middle", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", " The orientation or positional relationship indicated by top, bottom, inside, and outside is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the creation and simplifying the description, rather than indicating or implying that The device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention.

In this creation, unless otherwise expressly specified and limited, terms such as "setting", "installation", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or It is a detachable connection; it can be a mechanical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present creation can be understood according to specific situations.

As shown in FIG. 1 , a conductive crucible high-temperature evaporator heated by a plasma transfer arc includes a casing, a conductive crucible, a transfer arc gun 5 and a power source 6 . The conductive crucible is arranged in the inner cavity of the housing. The material of the conductive crucible is a high-temperature conductive material such as metal or graphite, which does not have a physical or chemical reaction with the heated object at high temperature. The casing is composed of a lower barrel 1 arranged outside the crucible body 3 and an upper cover 2 arranged outside the crucible cover 4 . The upper cover 2 is installed on the upper end of the lower barrel 1, and a thermal insulation layer 12 is provided between the lower barrel 1 and the crucible body 3, and between the upper cover 2 and the crucible cover 4, and the thermal insulation layer 12 is made of high-temperature resistant felt materials or ceramic materials. . Both the lower barrel 1 and the upper cover 2 are provided with a jacket structure 16, which is connected to an extracorporeal circulating cooling liquid system 7 arranged outside the casing, and is cooled by circulating cooling liquid to protect the equipment. The conductive crucible is composed of a crucible body 3 and a crucible cover 4 installed above the crucible body 3 . The inner cavity of the crucible body 3 is a concave structure with a large upper and a small lower, and the inner cavity of the crucible cover 4 is a dome-shaped or frustum-shaped structure with a large lower and a small upper. The bottom wall of the crucible body 3 is provided with an air inlet cavity 8 , and one side of the air inlet cavity 8 is communicated with the inner cavity of the crucible body 3 through a plurality of carrier gas input preheating channels 9 . A plurality of carrier gas input preheating channels 9 are distributed on the side wall of the crucible body 3 in a fan ring shape, and the carrier gas input preheating channels 9 are communicated with the carrier gas inlet 20 at the connection point of the inner cavity of the crucible body 3, and the carrier gas inlet 20 The height is 5-50mm. The other side of the air inlet cavity 8 is connected with several air guide passages 10 , and the ends of the several air guide passages 10 all extend to the outside of the casing. The shape of the air inlet cavity 8 is annular or fan-shaped, and the number of the air guide passages 10 communicating with the air inlet cavity 8 is 1-18. A conductive rod 11 is connected between the bottom of the crucible body 3 and the bottom of the casing. The transfer arc gun 5 is installed above the casing, and the lower end of the transfer arc gun 5 extends to the inner side of the crucible cover 4 . The bottom end face of the nozzle of the transfer arc gun 5 is located at a distance of -150mm to +150mm from the upper end face of the crucible body 3 . The transfer arc gun 5 and the conductive rod 11 are respectively electrically connected to the power source 6 .

Between the transfer arc gun 5 and the crucible cover 4, and between the transfer arc gun 5 and the casing, an insulating ventilation gap 13 is provided, and the width of the insulating ventilation gap 13 is 5-50 mm. The upper cover 2 of the casing is also provided with a feeding channel 14 , a gas outlet and liquid return channel 15 and several observation ports (not shown in the figure) for inspection and observation. The feeding channel 14 , the gas outlet and liquid return channel 15 and the observation port extend to the inner side of the crucible cover 4 . The feeding channel 14 is connected to an extracorporeal feeding system 17 for feeding. The viewing port can be used to install sight glasses or to install inspection probes.

In this invention, a transfer arc gun 5 is used, which extends downward from the top of the high-temperature evaporator into the crucible cover 4 inside the high-temperature evaporator, and is placed above the heated body in the crucible body 3 . The transferred arc gun 5 is the cathode, the heated body 19 is the anode, and the plasma gas arc 18 conducts between the cathode and the anode to continuously heat the heated body 19 as the anode with high power. The heated body 19 is placed in a high-temperature-resistant conductive crucible, and the conductive rod 11 provided at the bottom of the crucible body 3 communicates with the power source 6 outside the high-temperature evaporator and forms a conductive loop with the cathode. The upper cover 2 and the lower barrel 1 are in a sealed connection, and the connections between the upper cover 2 or the lower barrel 1 and other structures are all sealed connections to ensure the air gap between the high temperature evaporator and the outside of the high temperature evaporator. The plasma gas used in the carrier gas transfer arc gun, the gas circulating in the insulating ventilation gap 13 between the transfer arc gun 5 and the upper cover 2 and other gases entering the high temperature evaporator are all inert and do not chemically react with the heated body 19 gas, or the main gas source is an inert gas with a small amount of reactive components added.

The above shows and describes the basic principles and main features of the present creation and the advantages of the present creation. For those skilled in the art, it is obvious that the present creation is not limited to the details of the above-mentioned exemplary embodiments, and does not deviate from the spirit or basic of the present creation. In the case of the feature, the present invention can be realized in other specific forms. Therefore, the embodiments are to be regarded in all respects as exemplary and not restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and is therefore intended to fall within the scope of the claims. All changes within the meaning and scope of the equivalents of , are included in this creation.

1: Lower barrel 2: upper cover 3: Crucible body 4: Crucible cover 5: Transfer arc gun 6: Power 7: Extracorporeal circulation coolant system 8: Intake chamber 9: Carrier gas input preheating channel 10: Air guide channel 11: Conductive rod 12: Insulation layer 13: Insulation ventilation gap 14: Feeding channel 15: Air outlet and liquid return channel 16: Jacket structure 17: In vitro feeding system 18: Transfer Plasma Arc 19: heated body 20: Carrier gas inlet

Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of the non-limiting embodiments with reference to the following drawings.

FIG. 1 is a schematic cross-sectional structure diagram of an embodiment of the invention.

1: Lower barrel

2: upper cover

3: Crucible body

4: Crucible cover

5: Transfer arc gun

6: Power

7: Extracorporeal circulation coolant system

8: Intake chamber

9: Carrier gas input preheating channel

10: Air guide channel

11: Conductive rod

12: Insulation layer

13: Insulation ventilation gap

14: Feeding channel

15: Air outlet and liquid return channel

16: Jacket structure

17: In vitro feeding system

18: Transfer Plasma Arc

19: heated body

20: Carrier gas inlet

Claims (10)

A conductive crucible high-temperature evaporator heated by plasma transfer arc includes a shell, a conductive crucible, a transfer arc gun and a power source; the conductive crucible is arranged in the inner cavity of the shell, and the conductive crucible includes A crucible body and a crucible cover installed above the crucible body; an air inlet cavity is set in the bottom wall of the crucible body, and one side of the air inlet cavity is fed into the preheating channel through a plurality of carrier gases and is connected with the inner part of the crucible body The other side of the air inlet cavity is connected with a plurality of air guide channels, and the ends of the plurality of air guide channels all extend to the outside of the shell; between the bottom of the crucible body and the bottom of the shell A conductive rod is connected; the transfer arc gun is installed above the shell and the lower end of the transfer arc gun extends to the inner side of the crucible cover; the transfer arc gun and the conductive rod are respectively electrically connected with the power supply. The conductive crucible high-temperature evaporator using plasma transfer arc heating according to claim 1, wherein the casing comprises a lower barrel disposed outside the crucible body and an upper cover disposed outside the crucible cover; the upper cover is installed on the The upper end of the lower barrel, between the lower barrel and the crucible body, and between the upper cover and the crucible cover are provided with a thermal insulation layer. The conductive crucible high-temperature evaporator using plasma transfer arc heating as claimed in claim 2, wherein the lower barrel body and the upper cover are both provided with a jacket structure, and the jacket structure is provided with an external circuit outside the shell. Coolant system connection. The conductive crucible high-temperature evaporator using plasma transfer arc heating according to claim 1, wherein the conductive crucible is made of metal or graphite high-temperature-resistant conductive material. The conductive crucible high-temperature evaporator using plasma transfer arc heating according to claim 1, wherein the inner cavity of the crucible body is a concave structure with a large upper and a small lower, and the inner cavity of the crucible cover is large at the bottom and small at the top dome-shaped or frustum-shaped structure. The conductive crucible high-temperature evaporator using plasma transfer arc heating according to claim 1, wherein an insulating ventilation gap is provided between the transfer arc gun and the crucible cover, and between the transfer arc gun and the shell, The width of the insulating ventilation gap is 5-50mm. The conductive crucible high-temperature evaporator using plasma transfer arc heating as described in claim 1, wherein the upper end of the casing is further provided with a feeding channel, a gas outlet and liquid return channel and a plurality of observation ports for detection and observation. The channel, the gas outlet and liquid return channel and the observation port extend to the inner side of the crucible cover. The conductive crucible high-temperature evaporator using plasma transfer arc heating according to claim 1, wherein the bottom end face of the nozzle of the transfer arc gun is located at a distance of -150mm to +150mm from the upper end face of the crucible body. The conductive crucible high temperature evaporator using plasma transfer arc heating according to claim 1, wherein the shape of the air inlet cavity is a circular ring or a fan ring, and the number of the plurality of air guide channels is 1-18. The conductive crucible high-temperature evaporator using plasma transfer arc heating as described in claim 1, wherein the plurality of carrier gas input preheating channels are distributed on the side wall of the crucible body in a fan ring shape, and the plurality of carrier gas input preheating channels It is communicated with one of the carrier gas inlets in the communication part of the inner cavity of the crucible body, and the height of the carrier gas inlet is 5-50mm.

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