Water-cooled sealed vacuum metal liquid refining system

Abstract

The application discloses a water-cooled sealing vacuum metal liquid refining system and relates to the technical field of metal refining. The system comprises a furnace body and a water-cooled sealing cover. An annular support flange is fixed to the outer wall of the furnace body. The water-cooled sealing cover comprises a shell and a water-cooled cavity formed in the shell. The axial section of the water-cooled cavity is in the shape of Chinese character 'ji' and covers the upper end opening of the furnace body and the outer circumferential wall of the upper part of the furnace body. The water-cooled sealing cover is provided with a water inlet and a water outlet which are connected with the water-cooled cavity. The bottom of the water-cooled sealing cover is placed on the support flange. The contact surface between the support flange and the water-cooled sealing cover is provided with a high-temperature-resistant sealing element. The water-cooled sealing cover is fastened by a quick connecting assembly. A water-cooled gas pipe is arranged in the water-cooled cavity and is immersed in cooling water. The outer end of the water-cooled gas pipe penetrates through the outer side wall of the water-cooled sealing cover and is connected with a vacuum-pumping assembly. The inner end of the water-cooled gas pipe is connected with the inner cavity of the furnace body. An inert gas supply assembly is connected with the inner cavity of the furnace body. The furnace body is used as a vacuum tank body. The water-cooled sealing cover is directly coupled with the furnace body. The target volume for vacuum pumping is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of metal refining technology, specifically to a water-cooled, sealed, vacuum refining system for liquid metal. Background Technology

[0002] In the metal smelting industry, especially in the refining of high-quality steel, special alloys, and non-ferrous metals, vacuum treatment is a key process for removing gases (such as hydrogen, oxygen, and nitrogen), reducing inclusions, and precisely controlling composition. It plays an irreplaceable role in improving the purity and performance of metallic materials. Ladle vacuum refining, a common ladle-out refining technique, operates on the principle of placing a ladle containing molten metal in a vacuum environment to achieve refining.

[0003] Currently, common vacuum refining equipment for ladles generally adopts a large vacuum chamber structure, with the VD refining furnace being a representative example. This type of equipment seals the ladle through an outer vacuum chamber, the lid of which typically uses a butterfly-shaped end cap structure. VD refining furnaces are mainly used in the production of metals with strict requirements on the gas content, inclusion quantity, and chemical composition of the molten metal, such as low-alloy steel, low-carbon steel, and bearing steel. During operation, the VD refining furnace effectively reduces the hydrogen and nitrogen content in the steel by combining vacuum degassing with bottom-blowing argon stirring, and removes oxygen from the steel through the carbon-oxygen reaction, thereby improving the purity and quality of the steel.

[0004] However, existing ladle vacuum refining equipment, represented by the VD refining furnace, has significant technical defects:

[0005] Firstly, the vacuum tank is bulky, which directly results in a large footprint for the equipment and also keeps the manufacturing cost high, increasing the fixed investment burden of enterprises.

[0006] Secondly, because vacuuming requires evacuating the redundant space between the ladle and the tank, it not only prolongs the time to reach the required vacuum level but also significantly increases energy consumption. More importantly, the rapid drop in molten metal temperature during evacuation can affect refining results and compromise the quality stability of the metal products.

[0007] Third, during the vacuuming process, the gas escaping from the surface of the high-temperature molten metal is extremely hot. These high-temperature gases are very likely to cause thermal damage to key components such as the vacuuming pipeline, valves, and vacuum pump, thereby shortening the service life of the equipment, increasing the maintenance cost and downtime risk, and adversely affecting the continuity and economy of production.

[0008] Fourth, due to the large size of the vacuum tank and the pipes and seals that pass through the tank, it is very inconvenient to use and operate the vacuum degassing of the ladle in conjunction with the bottom blowing argon stirring. Summary of the Invention

[0009] To address the problems existing in the prior art, the present invention provides a water-cooled sealed vacuum refining molten metal system. By directly covering the ladle opening, it forms a compact sealed chamber with the upper part of the ladle, replacing the traditional bulky vacuum tank. Furthermore, the water-cooling design solves the risk of thermal damage to the vacuum system caused by high-temperature gases.

[0010] The technical solution adopted in this invention is as follows: a water-cooled sealed vacuum refining liquid metal system, including a furnace body and a water-cooled sealing cover provided at the upper opening of the furnace body, wherein an annular support flange is fixedly provided on the outer wall of the furnace body;

[0011] The water-cooled sealing cover includes a shell and a water-cooled cavity formed inside the shell. Its axial cross section is "U" shaped. The water-cooled sealing cover covers the upper opening of the furnace body and encloses the outer peripheral wall of the upper part of the furnace body. The water-cooled sealing cover is provided with at least one water inlet communicating with the water-cooled cavity and at least one water outlet communicating with the water-cooled cavity. The water inlet is connected to an external cooling water source through a pipe.

[0012] The bottom of the water-cooled sealing cover is placed on the support flange, and the contact surface between the water-cooled sealing cover and the support flange is provided with a high-temperature resistant sealing element. The water-cooled sealing cover and the support flange are fastened together by a quick-connect assembly.

[0013] A water-cooled air pipe is provided in the water-cooled cavity of the water-cooled sealing cover and is immersed in cooling water. The outer end of the water-cooled air pipe penetrates the outer wall of the water-cooled sealing cover and is connected to the vacuum assembly through a pipe. The inner end penetrates the inner wall of the water-cooled sealing cover and is connected to the internal cavity of the furnace body.

[0014] It also includes an inert gas supply assembly, which includes a gas supply pipeline. One end of the gas supply pipeline is connected to an inert gas source, and the other end is connected to the internal chamber of the furnace body.

[0015] Furthermore, the water-cooled cavity includes a lower annular swirl generation zone and an upper pipe cooling zone, the pipe cooling zone being connected to the annular swirl generation zone. The water inlet is located on the side wall of the annular swirl generation zone, and the axial direction of the water inlet is set at a non-orthogonal angle to the inner wall of the water-cooled cavity, so that the cooling water forms a swirl when entering the water-cooled cavity. The water outlet is located on the top plate of the water-cooled sealing cover, and the water-cooled air pipe is located in the pipe cooling zone.

[0016] Furthermore, the water-cooled gas pipe includes a first main pipe section that penetrates the inner wall of the water-cooled sealing cover and communicates with the internal cavity of the furnace body, a second main pipe section that penetrates the outer wall of the water-cooled sealing cover and communicates with the pipe connecting the vacuum assembly, and multiple airflow branch pipes that connect the first main pipe section and the second main pipe section.

[0017] Furthermore, the airflow branch pipe is arranged in multiple layers along the vertical direction, with each layer containing at least one airflow branch pipe. The first main pipe section and the second main pipe section are provided with radial baffles to separate the first main pipe section / second main pipe section into independent flow channels, so that the gas flows through each layer of airflow branch pipes in sequence according to a preset path.

[0018] Furthermore, an arc-shaped guide baffle is provided on the inner wall of the top plate of the water-cooling cavity below the water outlet. The curved extension direction of the arc-shaped guide baffle matches the swirling direction of the cooling water, and its longitudinal section cuts the swirling water.

[0019] Furthermore, multiple guide ribs are provided circumferentially on the outer wall of the furnace body above the supporting flange. Each guide rib extends along the furnace body axis and has a wedge-shaped guide surface that slopes outward from the furnace wall.

[0020] Furthermore, the inert gas supply assembly adopts any one or a combination of the following structural forms:

[0021] (a) Connect to the bottom blowing device located at the bottom of the furnace body;

[0022] (b) Connect to a tee fitting installed on the pipe connecting the vacuum assembly and the water-cooled gas pipe;

[0023] (c) An independent air supply pipe that runs through the water-cooled sealing cap;

[0024] The combination methods include combinations of (a) and (b) or combinations of (a) and (c).

[0025] Furthermore, the inlet and outlet of the water-cooled sealing cover are connected to a circulating water cooling device through pipes to form a closed cooling medium circulation loop.

[0026] Furthermore, the bottom of the furnace body is provided with a molten metal pouring port; a switch valve and a quick connector are provided on the external pipeline connected to the water-cooled sealing cover. When pouring is performed, the switch valve is closed and the quick connector is disconnected, so that the water-cooled sealing cover remains in a sealed connection with the furnace body and moves and tilts with the furnace body.

[0027] Furthermore, the water-cooled sealing cover is provided with a feeding and temperature measuring tube that penetrates the water-cooled sealing cover, and a sealing valve is provided at the upper end of the feeding and temperature measuring tube.

[0028] The beneficial effects of this invention are as follows:

[0029] (1) By directly coupling the water-cooled sealing cover with the opening at the top of the furnace body, the vacuum action area is compressed from the large space of the "ladle + tank" of the traditional VD furnace to only the gas phase zone above the molten metal. This structure greatly reduces the target volume of vacuuming, significantly shortens the vacuuming time, improves production efficiency, greatly reduces the load and running time of the vacuum pump group, significantly reduces energy consumption and operating costs, and greatly reduces the overall size and floor area of ​​the equipment, thus reducing equipment investment costs and workshop space requirements.

[0030] (2) A water-cooled chamber is set inside the sealed cover so that the water-cooled gas pipe is fully immersed in the cooling water. When the high-temperature gas is drawn out and flows through the water-cooled gas pipe, its heat is quickly absorbed by the surrounding cooling medium, ensuring that the high-temperature gas is fully cooled before entering the external pipeline system and vacuum pump group. This effectively avoids the thermal shock and thermal damage of the high-temperature gas to key components such as the gas extraction pipeline, valves, and vacuum pump, significantly extends the service life of the vacuum system, reduces the maintenance frequency and cost, and improves the reliability and safety of equipment operation.

[0031] (3) The use of a Z-shaped water-cooled sealing cover makes the sealing element located at the lower end of the Z-shaped structure, away from the high-temperature radiation zone of the furnace mouth. The cooling water in the swirling generation zone continuously removes the heat from the sealing interface, causing the temperature of the sealing interface to drop sharply, which is beneficial to the long-term sealing of the furnace cover sealing element. The design of the narrow and long annular swirling generation zone reduces the radial diffusion of the water flow, making the kinetic energy of the water flow more concentrated in the circumferential direction. The rotational motion is not disturbed, making it easier to form a spiral flow state of rotation and rise, accelerating the flow of cooling water, removing the heat from the water-cooled cavity, and causing the hot air flow drawn into the water-cooled gas pipe to cool down rapidly.

[0032] (4) The water-cooled gas pipe adopts a gas dispersion structure with a main pipe connecting several small gas flow branches, which induces the hot gas flow that is drawn into the vacuum inside the pipe to disperse and turbulent, destroying the steady state of the gas flow thermal boundary layer. The gas flow branch group is three-dimensionally wrapped by swirling cooling water, forming a triple heat exchange enhancement mechanism of "dispersed gas flow - turbulent disturbance - water-cooled wrapping", thereby improving the heat exchange efficiency of the hot gas flow and accelerating the temperature drop of the hot gas flow.

[0033] (5) The external pipeline of the water-cooled sealing cover is equipped with quick connectors and switching valves. After the vacuum refining of the molten metal is completed, the vacuum pipeline is closed and the inert gas pipeline is switched to fill the furnace with inert gases such as argon. The switching valve is closed and the quick connector is pulled out to maintain the water-cooled cover in a sealed state. Under the "argon vacuum" protective atmosphere of the molten metal, the bottom molten metal pouring port is poured, so that the molten metal is isolated from the atmosphere from the end of refining to the pouring operation, which is more conducive to cleaning the molten metal. Therefore, the refining effect is better than that of the traditional VD refining furnace when the ladle opening is open and subject to air recontamination during pouring.

[0034] (6) The present invention uses the furnace body as a vacuum tank, which makes it more convenient and easier to operate the furnace body vacuuming and furnace bottom argon blowing for refining. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the overall structure of the vacuum refining metal water-cooled sealing mechanism of the present invention.

[0036] Figure 2 This is a cross-sectional structural diagram of the water-cooled sealing cap of the present invention.

[0037] Figure 3 This is a top view structural diagram of the water-cooled sealing cap of the present invention.

[0038] Figure 4 This is a schematic diagram of one possible arrangement of the water-cooled air pipe of the present invention.

[0039] Figure 5 This is a side view of the furnace body and the water-cooled sealing cover in the engagement state of the present invention.

[0040] Figure 6 This is a schematic diagram of the working state of the present invention, in which molten metal is discharged from the upper ladle.

[0041] In the diagram: Furnace body 1, guide rib 101, bottom blowing device 102, molten metal pouring port 103, upper ladle port 104, support flange 2, water-cooled sealing cover 3, shell 301, water-cooled cavity 302, annular swirl generation zone 302a, pipe cooling zone 302b, water inlet 303, water outlet 304, arc-shaped guide baffle 305, high-temperature resistant sealing component 306, refractory insulation material layer 307, feeding temperature measuring pipe 308, water-cooled gas pipe 4, first main pipe section 401, second main pipe section 402, airflow branch pipe 403, circulating water cooling device 5, vacuum assembly 6, inert gas supply assembly 7, switch valve 8, quick connector 9. Detailed Implementation

[0042] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0043] like Figures 1-4 As shown, this embodiment provides a water-cooled sealed vacuum refining liquid metal system, including a furnace body 1, an annular support flange 2, a water-cooled sealing cover 3, a water-cooled gas pipe 4, a circulating water cooling device 5, a vacuum assembly 6, and an inert gas supply assembly 7.

[0044] The furnace body 1 is the main structure carrying the molten metal and also serves as a vacuum tank for vacuum refining. It is lined with an insulation lining and a refractory working lining to ensure erosion resistance, leak prevention, and molten metal insulation. The furnace wall has no vent holes, which facilitates vacuum sealing. The annular support flange 2 is an annular flange welded or fixed to the outer wall of the furnace body, serving as the load-bearing, sealing, and positioning reference for the water-cooled sealing cover 3. In this embodiment, to achieve rapid and accurate centering of the water-cooled sealing cover 3, multiple guide ribs 101 are provided circumferentially on the outer wall of the furnace body 1 above the support flange 2. Each guide rib 101 extends axially along the furnace body 1 and has a wedge-shaped guide surface that slopes outward from the furnace wall. To accommodate the installation of the water-cooled sealing cover 3 and the annular support flange 2, the rotating shaft connected to the furnace body 1 is lengthened, and the hanger is widened.

[0045] like Figure 1 , Figure 5 As shown, in this embodiment, the bottom of the furnace body 1 is provided with a bottom blowing device 102 and a molten metal pouring port 103, while retaining an upper pouring ladle port 104. During pouring, the molten metal can be poured out from either the bottom molten metal pouring port 103 or the upper pouring ladle port 104. To accommodate the upper pouring ladle port 104, the supporting flange 2 adopts an eccentric structure protruding to the side of the upper pouring ladle port. Furthermore, to prevent molten metal from dripping onto the supporting flange 2 when pouring from the upper pouring ladle port, a clear space is reserved between the molten metal surface and the upper edge inside the furnace body 1 (see [reference]). Figure 6 ).

[0046] The water-cooled sealing cover 3 includes a shell 301 and a water-cooled cavity 302 formed inside the shell 301. Its axial cross-section is U-shaped, covering the upper opening of the furnace body 1 and enclosing the outer peripheral wall of the upper part of the furnace body 1. The water-cooled cavity 302 includes a lower annular swirl generation zone 302a and an upper pipe cooling zone 302b. The pipe cooling zone 302b is connected to the annular swirl generation zone 302a, and a conical transition zone can be provided between the pipe cooling zone 302b and the annular swirl generation zone 302a to achieve a smooth flow field transition. The upper shape of the water-cooled sealing cover 3 is not limited and can be planar, arc-shaped, or conical. To facilitate feeding, temperature measurement, and other operations, in this embodiment, a feeding and temperature measuring pipe 308 penetrating the water-cooled sealing cover 3 is also provided on the water-cooled sealing cover 3, and a sealing valve is provided at the upper end of the feeding and temperature measuring pipe 308.

[0047] The bottom of the water-cooled sealing cover 3 is placed on the supporting flange 2. A high-temperature resistant sealing element 306 is provided at the contact surface between the water-cooled sealing cover 3 and the supporting flange 2. The water-cooled sealing cover 3 and the supporting flange 2 are fastened together by a quick-connect assembly. The high-temperature resistant sealing element 306 is located away from the high-temperature radiation zone along the upper edge of the furnace opening and continuously carries away heat from the sealing interface through the cooling water in the swirl generation zone, significantly improving its service life. The inner wall of the water-cooled sealing cover 3 above the furnace opening of the furnace body 1 is covered with a refractory insulation material layer 307 to reduce the impact of high temperatures on the shell 301 and effectively reduce heat transfer to the water-cooled cavity, thus lowering the cooling load.

[0048] At least one water inlet 303 is provided on the side wall of the annular swirl generation area 302a of the water-cooled sealing cover 3 (in specific implementation, multiple water inlets 303 can be arranged in layers and circumferentially according to actual conditions; the present invention does not limit the number of water inlets 303). The water inlet 303 is connected to an external cooling water source through a pipe. The axial direction of the water inlet 303 is set at a non-orthogonal angle (preferably tangential) with the inner wall of the water-cooled cavity 302, so that the cooling water enters the water-cooled cavity 302 at a tangential velocity to form a swirl.

[0049] At least one water outlet 304 is provided on the top plate of the water-cooled sealing cover 3. Figure 3 The number of water outlets 304 shown is two (the specific number can be reasonably set according to the actual situation). In order to guide the swirling flow to converge and discharge, in this embodiment, an arc-shaped guide baffle 305 is provided on the inner wall of the top plate of the water-cooling cavity 302 below the water outlet 304. The curved extension direction of the arc-shaped guide baffle 305 matches the direction of the cooling water swirling flow, and its longitudinal section has an acute angle configuration that cuts the water swirling flow at an angle, thereby guiding the swirling flow to rise, reducing turbulent dissipation when the water is discharged, and maintaining the stability of the swirling flow.

[0050] In this embodiment, the inlet 303 and outlet 304 of the water-cooled sealing cover 3 are connected to the circulating water cooling device 5 through pipes to form a closed cooling medium circulation loop.

[0051] A water-cooled gas pipe 4, submerged in cooling water, is provided in the pipe cooling zone 302b of the water-cooled sealing cover 3. The outer end of the water-cooled gas pipe 4 penetrates the outer wall of the water-cooled sealing cover 3 and is connected to the vacuum assembly 6 through a pipe. The inner end penetrates the inner wall of the water-cooled sealing cover 3 and is connected to the internal cavity of the furnace body 1. The water-cooled gas pipe 4 can be arranged in a spiral or irregular shape in the pipe cooling zone 302b to extend the cooling path.

[0052] To enhance heat exchange efficiency, in this embodiment, the water-cooled gas pipe 4 includes a first main pipe section 401 that penetrates the inner wall of the water-cooled sealing cover 3 and communicates with the internal cavity of the furnace body 1; a second main pipe section 402 that penetrates the outer wall of the water-cooled sealing cover 3 and communicates with the pipe connecting the vacuum assembly 6; and multiple airflow branch pipes 403 that connect the first main pipe section 401 and the second main pipe section 402. The airflow branch pipes 403 are arranged in multiple layers along the vertical direction, with each layer containing at least one airflow branch pipe 403. Radial baffles are provided inside the first main pipe section 401 and the second main pipe section 402, separating the first main pipe section 401 / second main pipe section 402 into independent flow channels, allowing gas to flow sequentially through each layer of airflow branch pipes 403 along a preset path. The diameter and number of the first main pipe section 401, the second main pipe section 402, and the airflow branch pipe 403, as well as the height, length, and straightness of the airflow branch pipe 403, are not limited. The purpose is to connect a large number of small branch pipes through the main pipe to induce the dispersion and turbulence of the hot airflow that is being drawn into the vacuum inside the pipe, thereby improving the heat exchange efficiency of the hot airflow and accelerating the temperature drop of the hot airflow.

[0053] The water-cooled sealed vacuum refining molten metal system of the present invention also includes an inert gas supply component 7. The inert gas supply component 7 includes a gas supply pipeline. One end of the gas supply pipeline is connected to an inert gas source, and the other end is connected to the internal chamber of the furnace body 1. By supplying inert gas (such as Ar or N2) into the furnace, a non-oxidizing atmosphere inside the furnace is maintained to prevent the molten metal from oxidizing.

[0054] In this embodiment, the inert gas supply assembly 7 is connected to the bottom blowing device 102 at the bottom of the furnace body 1 via a gas supply pipeline. At the same time, it is connected to the pipeline of the vacuum assembly 6 and the water-cooled gas pipe 4 via a three-way connector. The gas supply pipeline is directly connected to the bottom blowing device 102, which, compared with the traditional outer vacuum tank body with pipe fittings and seals, more conveniently realizes bottom blowing (argon, etc.) refining. After vacuum refining of the molten metal is completed, inert gases such as argon can be introduced into the furnace through the water-cooled gas pipe 4. On the one hand, this can quickly and safely restore the furnace pressure to balance with the external atmospheric pressure, avoiding the safety hazards caused by difficulty in opening the lid or sudden pressure release due to internal negative pressure. On the other hand, after refining is completed, the vacuum pipe can be closed and inert gases such as argon can be introduced into the furnace to maintain a certain positive pressure inside the furnace. The switch valve 8 can be closed and the quick connector 9 can be pulled out to maintain the water-cooled sealing cover 3 in a sealed state. Under the "argon vacuum" protective atmosphere of the molten metal, the bottom molten metal pouring port 103 can be used for pouring. This isolates the molten metal from the atmosphere from the end of refining to the pouring operation, which is more conducive to cleaning the molten metal. Therefore, the refining effect is better than that of traditional VD refining furnaces where the ladle opening is open and subject to recontamination by air.

[0055] The gas supply pipeline of the inert gas supply assembly 7 can also be set as an independent gas supply pipeline that runs through the water-cooled sealing cover 3. When using the upper ladle port to dispense molten metal, the water-cooled sealing cover 3 can be opened and the metal transferred, and the molten metal can be poured out from the upper ladle port by tilting the furnace body 1 to complete the pouring.

[0056] Furthermore, it should be noted that the water-cooled sealed vacuum refining liquid metal system provided by the present invention is not limited to ladle refining, but can also be used for refining in heated smelting furnaces.

[0057] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the present invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A water-cooled sealing vacuum refining liquid metal system, comprising a furnace body (1) and a water-cooled sealing cover (3) arranged at the opening of the upper end of the furnace body (1), characterized in that: an annular support flange (2) is fixedly arranged on the outer wall of the furnace body (1); the water-cooled sealing cover (3) comprises a shell (301) and a water-cooled cavity (302) formed in the shell (301), the axial section of the water-cooled cavity (302) is in the shape of "J", the water-cooled sealing cover (3) covers the opening of the upper end of the furnace body (1) and covers the outer circumferential wall of the upper part of the furnace body (1); at least one water inlet (303) and at least one water outlet (304) are arranged on the water-cooled sealing cover (3) and are connected with the water-cooled cavity (302), the water inlet (303) is connected with an external cooling water source through a pipeline; the bottom of the water-cooled sealing cover (3) is arranged on the support flange (2), a high-temperature-resistant sealing element (306) is arranged on the contact surface between the water-cooled sealing cover (3) and the support flange (2), and the water-cooled sealing cover (3) and the support flange (2) are fastened and connected through a quick connection assembly; a water-cooled gas pipe (4) is arranged in the water-cooled cavity (302) of the water-cooled sealing cover (3) and is immersed in the cooling water, the outer end of the water-cooled gas pipe (4) penetrates the outer side wall of the water-cooled sealing cover (3) and is connected with a vacuum pumping assembly (6) through a pipeline, and the inner end of the water-cooled gas pipe (4) penetrates the inner side wall of the water-cooled sealing cover (3) and is connected with the internal cavity of the furnace body (1); the system further comprises an inert gas supply assembly (7), the inert gas supply assembly (7) comprises a gas supply pipeline, one end of the gas supply pipeline is connected with an inert gas source, and the other end of the gas supply pipeline is connected with the internal cavity of the furnace body (1); the water-cooled cavity (302) comprises an annular rotational flow generating area (302a) at the lower part and a pipeline cooling area (302b) at the upper part, the pipeline cooling area (302b) is connected with the annular rotational flow generating area (302a), the water inlet (303) is arranged on the side wall of the annular rotational flow generating area (302a), the axis direction of the water inlet (303) is arranged at a non-orthogonal angle with the inner wall of the water-cooled cavity (302), so that rotational flow is formed when the cooling water enters the water-cooled cavity (302), the water outlet (304) is arranged on the top plate of the water-cooled sealing cover (3), and the water-cooled gas pipe (4) is arranged in the pipeline cooling area (302b); the water-cooled gas pipe (4) comprises a first main pipe section (401) penetrating the inner side wall of the water-cooled sealing cover (3) and connected with the internal cavity of the furnace body (1), a second main pipe section (402) penetrating the outer side wall of the water-cooled sealing cover (3) and connected with the pipeline of the vacuum pumping assembly (6), and a plurality of gas flow branch pipes (403) connected with the first main pipe section (401) and the second main pipe section (402); the gas flow branch pipes (403) are arranged in multiple layers in the vertical direction, each layer comprises at least one gas flow branch pipe (403), and radial partitions are arranged in the first main pipe section (401) and the second main pipe section (402), so that the first main pipe section (401) and the second main pipe section (402) are divided into independent flow channels, and the gas flows through each layer of the gas flow branch pipes (403) in a preset path. ​ ​ ​ ​ ​ ​ ​ A plurality of guiding and positioning ribs (101) are circumferentially arranged on the outer wall of the furnace body (1) above the supporting flange (2), each guiding and positioning rib (101) extends along the axial direction of the furnace body (1) and has a wedge-shaped guiding surface which is inclined outward from the furnace wall.

2. A water cooled sealed vacuum metal refining system as claimed in claim 1 wherein: An arc-shaped guiding baffle (305) is arranged on the inner wall of the top plate of the water cooling cavity (302) below the water outlet (304), the curved surface of the arc-shaped guiding baffle (305) extends in the matching direction of the cooling water rotation, and the longitudinal section of the arc-shaped guiding baffle (305) cuts the water rotation.

3. A water cooled sealed vacuum metal refining system as claimed in claim 1 wherein: The inert gas supply assembly (7) adopts any one of the following structural forms or a combination thereof: (a) a bottom blowing device (102) arranged at the bottom of the furnace body (1); (b) a three-way joint connected with a pipeline arranged on the water-cooled gas pipe (4) connected with the vacuum pumping assembly (6); (c) a gas supply pipe independently penetrating the water-cooled sealing cover (3); The combination mode is a combination of (a) and (b) or a combination of (a) and (c).

4. A water cooled sealed vacuum metal refining system as claimed in claim 1 wherein: The water inlet (303) and the water outlet (304) of the water-cooled sealing cover (3) are connected with the circulating water cooling device (5) through a pipeline to form a closed cooling medium circulation loop.

5. A water cooled sealed vacuum metal refining system as claimed in claim 1, wherein: The bottom of the furnace body (1) is provided with a molten metal pouring opening (103); a switch valve (8) and a quick connector (9) are arranged on the outer connecting pipeline connected with the water-cooled sealing cover (3), when pouring is performed, the switch valve (8) is closed and the quick connector (9) is disconnected, so that the water-cooled sealing cover (3) remains in a sealed connection state with the furnace body (1) and moves and tilts with the furnace body (1).

6. A water cooled sealed vacuum system for refining metal liquid as claimed in claim 1 wherein: A feeding and temperature measuring pipe (308) penetrating the water-cooled sealing cover (3) is arranged on the water-cooled sealing cover (3), and a closing valve is arranged at the upper end of the feeding and temperature measuring pipe (308).

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