Vacuum intermediate frequency furnace convenient to accurately detect and control

Abstract

The utility model discloses a vacuum intermediate frequency furnace convenient to accurately detect and control in the related technical field of vacuum intermediate frequency furnaces, which comprises a water jacket type furnace shell and a crucible, a circle of magnetic shielding plate is arranged in the water jacket type furnace shell close to the inner wall of the furnace shell, and the crucible is placed in the center of the lower part of the water jacket type furnace shell. A magnetic shielding plate is arranged on the crucible wall, an induction coil is arranged between the crucible wall and the magnetic shielding plate, refractory powder is filled between the crucible wall and the water jacket type furnace shell, a magnetic shielding type thermocouple is arranged above the induction coil, and the thermocouple is arranged in a porcelain sleeve. The magnetic shielding type thermocouple is arranged above the induction coil, the ceramic sleeve and a double-sealing structure are combined, the technical problem that the temperature of a traditional vacuum furnace cannot be accurately measured in real time is solved, temperature detection and vacuum degree monitoring are combined, double control over the metal melting and separating process is achieved, the combination of the water jacket type furnace shell, the magnetic shielding plate and fireproof powder filling is achieved, and the production efficiency is improved. The equipment strength is ensured, the magnetic field distribution and the thermal insulation performance are optimized, and the melt separation efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of vacuum intermediate frequency furnaces, specifically, it relates to a vacuum intermediate frequency furnace that is easy to detect and control accurately. Background Technology

[0002] A vacuum intermediate frequency furnace is a device used for high-temperature metal smelting. It utilizes electromagnetic induction heating to melt, refine, and separate metals in a vacuum or inert gas environment. Its core advantages lie in preventing metal oxidation, improving purity, and achieving precise temperature control. It can be widely used in mixed metal melting and precious metal purification, offering advantages such as high detection accuracy, safe operation, and energy efficiency. Currently, commonly used vacuum intermediate frequency furnaces, when melting and separating multiple mixed metals, fail to detect the furnace temperature, making it impossible to accurately determine whether the melting of the mixed metals is complete. This is often addressed by relying on experience, which can lead to either melting time exceeding the required time or the furnace cap being opened before melting is complete, resulting in unstable melting effects.

[0003] In view of this, this utility model is proposed. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a vacuum intermediate frequency furnace that is easy to detect and control accurately. The basic concept of the technical solution adopted by this utility model to solve the above technical problem is as follows:

[0005] A vacuum intermediate frequency furnace for easy and accurate detection and control includes a water-jacketed furnace shell and a crucible. A magnetic shielding plate is installed near the inner wall of the water-jacketed furnace shell. A crucible is placed at the center of the lower part of the water-jacketed furnace shell. An induction coil is installed between the crucible wall and the magnetic shielding plate. Refractory powder is filled between the crucible wall and the water-jacketed furnace shell. A magnetic shielding thermocouple is installed above the induction coil and is mounted inside a ceramic sleeve. A short section of steel pipe is welded tightly to the furnace shell at the point where the ceramic sleeve extends outside the furnace shell. A fixing plate is welded to the other end of the steel pipe. The fixing plate is a flange structure and connects to the flange of the thermocouple itself. A soft gasket is used for sealing between the two flanges. A heat insulation groove is provided on the water-jacketed furnace shell, and the ceramic sleeve is located within the heat insulation groove. The upper part of the water-jacketed furnace shell is a furnace cap formed by the outer shell of the water-jacketed furnace shell. The furnace cap and the furnace shell are two separate parts, allowing the furnace cap to be lifted open when the metal melting is complete.

[0006] As a further embodiment of this utility model: an air intake port and an emergency air intake port are provided on the upper edge of the side of the furnace cap. An air inlet valve is provided on the emergency air intake port pipe to draw air into the furnace when the furnace cap is opened, so that the furnace is in a non-vacuum state before the furnace cap can be opened and lifted.

[0007] As a further improvement of this utility model: an air intake valve is installed at the air intake port, and the gas discharged from the air intake port is connected to the vacuum pump system through a pipeline to make the furnace a vacuum state.

[0008] As a further improvement of this utility model: a vacuum gauge is installed on the pipe connected to the vacuum pump outside the air intake. By measuring the change in vacuum, it is possible to determine whether the volatile metal has completely volatilized. By detecting the temperature inside the furnace, it is possible to accurately know whether the metal inside the furnace has completely melted.

[0009] As a further embodiment of this utility model: a zinc collection trough is placed inside the furnace cap and above the crucible. The zinc collection trough is an annular groove. A furnace cover is placed above the zinc collection trough. The furnace cover has legs at the bottom and is placed on the zinc collection trough to prevent some dust from falling into the furnace.

[0010] As a further improvement of this utility model: the entire vacuum intermediate frequency furnace sits on a tilting frame, which is tilted by a hydraulic rod. After the crucible is completely melted by tilting, the high-boiling-point metal is poured out.

[0011] By adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art.

[0012] This invention features a shielded thermocouple above the induction coil, combined with a ceramic sleeve and a double-sealed structure. This solves the technical problem of traditional vacuum furnaces being unable to measure temperature accurately in real time. By combining temperature detection with vacuum monitoring, it achieves dual control over the metal melting process. The combination of a water-jacketed furnace shell, shielded magnetic plate, and refractory powder filling ensures equipment strength, optimizes magnetic field distribution and insulation performance, and improves melting efficiency.

[0013] This utility model features an emergency air intake port linked to a vacuum pump to prevent accidental opening of the furnace cap, thus solving the safety hazards associated with opening the lid of a traditional vacuum furnace.

[0014] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but do not constitute an undue limitation of the present invention. Obviously, the drawings described below are merely some embodiments; those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0016] Figure 1 This is a schematic diagram of the present invention;

[0017] Figure 2 This is a partial enlarged view of point A of this utility model.

[0018] In the diagram: 1. Water-jacketed furnace shell; 2. Magnetic shielding plate; 3. Induction coil; 4. Hydraulic rod; 5. Tilting frame; 6. Crucible; 7. Zinc collecting tank; 8. Annular groove; 9. Furnace cover; 10. Suction valve; 11. Suction port; 12. Thermocouple; 13. Fixing plate; 14. Insulation tank; 15. Furnace cap; 16. Emergency suction port; 17. Vacuum gauge.

[0019] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0021] like Figures 1 to 2 As shown, a vacuum intermediate frequency furnace for easy and accurate detection and control includes a water-jacketed furnace shell 1 and a crucible 6. A magnetic shielding plate 2 is installed inside the water-jacketed furnace shell 1 near the inner wall. The crucible 6 is placed at the center of the lower part of the water-jacketed furnace shell 1. An induction coil 3 is installed between the wall of the crucible 6 and the magnetic shielding plate 2. Refractory powder is filled between the wall of the crucible 6 and the water-jacketed furnace shell 1. A magnetic shielding thermocouple 12 is installed above the induction coil 3, and the thermocouple 12 is installed inside a ceramic sleeve. The furnace exits from the ceramic sleeve... Outside the shell, a small section of steel pipe is welded tightly to the furnace shell. The other end of the steel pipe is welded to a fixing plate 13, which is a flange structure and is connected to the flange of the thermocouple itself. A soft gasket is filled between the two flanges for sealing. A heat insulation groove 14 is provided on the water jacket furnace shell 1, and the ceramic sleeve is located in the heat insulation groove 14. The upper part of the water jacket furnace shell 1 is a furnace cap 15 formed by the water jacket shell. The furnace cap 15 and the furnace shell are two separate parts that can be lifted open when the metal melting is finished.

[0022] The furnace cap 15 has an air intake 11 and an emergency air intake 16 located on the upper side of its side. The emergency air intake 16 is equipped with an air intake valve to draw air into the furnace when the furnace cap 15 is opened, so that the furnace is in a non-vacuum state before the furnace cap 15 can be opened.

[0023] An air intake valve 10 is installed at the air intake 11. The gas discharged from the air intake 11 is connected to the vacuum pump system through a pipeline to make the furnace a vacuum state.

[0024] A vacuum gauge 17 is installed on the pipe connecting the air intake 11 to the vacuum pump. By measuring the change in vacuum, it can determine whether the volatile metal has completely volatilized. By detecting the temperature inside the furnace, it can accurately know whether the metal inside the furnace has completely melted.

[0025] A zinc collection trough 7 is placed inside the furnace cap 15 and above the crucible 6. The zinc collection trough 7 is an annular groove 8. A furnace cover 9 is placed above the zinc collection trough 7. The furnace cover 9 with legs is placed on the zinc collection trough 7 to prevent some dust from falling into the furnace.

[0026] The entire vacuum intermediate frequency furnace sits on the tilting frame 5, which is tilted by the hydraulic rod 4. After the crucible 6 is completely melted by tilting, the high boiling point metal is poured out.

[0027] The working principle of this utility model is as follows: a shielded thermocouple is installed above the induction coil 3 and installed inside a ceramic sleeve. A small section of steel pipe is welded tightly to the furnace shell at the point where the ceramic sleeve exits the furnace shell. A fixing plate 13 is welded to the other end of the steel pipe and connected to the flange of the thermocouple itself. Soft gaskets are filled between the connection points to ensure the stability of the thermocouple 12 installation. The built-in, sealed thermocouple 12 can measure the internal temperature in real time and accurately while ensuring the vacuum degree inside the vacuum furnace.

[0028] The vacuum intermediate frequency furnace has a magnetic shielding plate 2 near the inner wall of the furnace shell. A crucible 6 is placed at the center of the furnace shell. An induction coil 3 is set between the wall of the crucible 6 and the magnetic shielding plate 2. Refractory powder is filled between the wall of the crucible 6 and the furnace shell. The entire vacuum intermediate frequency furnace sits on a tilting frame 5. The tilting frame 5 is tilted by a hydraulic rod 4. After the melting in the crucible 6 is completed by tilting, the high boiling point metal is poured out. The tilting frame 5 is existing technology and will not be described in detail.

[0029] This utility model features a shielded thermocouple 12 above the induction coil 3, combined with a ceramic sleeve and a double-sealed structure, which solves the technical problem of traditional vacuum furnaces being unable to measure temperature accurately in real time. It combines temperature detection with vacuum monitoring to achieve dual control of the metal melting process. The combination of the water-jacketed furnace shell 1, the shielded magnetic plate 2, and the refractory powder filling ensures the strength of the equipment, optimizes the magnetic field distribution and heat preservation performance, and improves the melting efficiency. The emergency suction port 16 and the anti-accidental opening furnace cap 15 device linked to the vacuum pump solve the safety hazards when opening the lid of the traditional vacuum furnace.

[0030] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A vacuum intermediate frequency furnace for easy and accurate detection and control, comprising a water-jacketed furnace shell (1) and a crucible (6), characterized in that, A magnetic shielding plate (2) is provided inside the water-jacketed furnace shell (1) near the inner wall of the furnace shell. A crucible (6) is placed at the center of the lower part of the water-jacketed furnace shell (1). An induction coil (3) is set between the wall of the crucible (6) and the magnetic shielding plate (2). Refractory powder is filled between the wall of the crucible (6) and the water-jacketed furnace shell (1). A magnetic shielding thermocouple (12) is set above the induction coil (3). The thermocouple (12) is installed inside a porcelain sleeve, with the porcelain sleeve extending outside the furnace shell. At one end, a small section of steel pipe is welded tightly to the furnace shell, and a fixing plate (13) is welded to the other end of the steel pipe. The fixing plate (13) is a flange structure and is connected to the flange of the thermocouple itself. A soft gasket is filled between the two flange plates for sealing. A heat insulation groove (14) is provided on the water jacket furnace shell (1), and a ceramic sleeve is located in the heat insulation groove (14). The upper part of the water jacket furnace shell (1) is a furnace cap (15) formed by the water jacket shell. The furnace cap (15) and the furnace shell are two separate parts.

2. The vacuum intermediate frequency furnace according to claim 1, characterized in that, The furnace cap (15) has an air intake (11) and an emergency air intake (16) on its upper side. The emergency air intake (16) is equipped with an air inlet valve.

3. The vacuum intermediate frequency furnace according to claim 2, characterized in that, An air intake valve (10) is installed at the air intake (11).

4. A vacuum intermediate frequency furnace for easy and accurate detection and control according to claim 3, characterized in that, A vacuum gauge (17) is installed on the pipe connecting the air inlet (11) to the vacuum pump.

5. A vacuum intermediate frequency furnace for easy and accurate detection and control according to claim 4, characterized in that, A zinc collecting trough (7) is placed inside the furnace cap (15) and above the crucible (6). The zinc collecting trough (7) is an annular groove (8). A furnace cover (9) is placed above the zinc collecting trough (7). The furnace cover (9) has legs at the bottom.

6. A vacuum intermediate frequency furnace for easy and accurate detection and control according to claim 5, characterized in that, The vacuum intermediate frequency furnace is set on a tilting frame (5), which is tilted by a hydraulic rod (4).

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