Waste discharge port structure of vacuum induction melting furnace

Abstract

The utility model relates to the field of special metallurgy, and discloses a waste discharge port structure of a vacuum induction melting furnace, which is characterized in that a gas path gas inlet is connected with a waste gas exhaust port of the vacuum induction melting furnace, and a gas outlet is connected with a vacuum pump through a pipeline; the drawing and inserting type first-stage filter is a high-temperature-resistant filter and is inserted into the gas path on one side of the gas inlet of the gas path; the cooling assembly is arranged in an air path between the first filter and the second filter in the air flow direction. The drawing and inserting type secondary filter is inserted into the gas path on one side of the gas outlet of the gas path; and the turbulent flow piece is formed on the inner wall of the gas path and / or the outer wall of the cooling assembly and used for increasing the heat exchange area and prolonging the waste gas passing time of the vacuum induction melting furnace. The service life of the vacuum pump can be effectively prolonged, and the failure probability of the vacuum pump is reduced.

Description

Technical Field

[0001] This utility model relates to the field of special metallurgy, and in particular to a waste outlet structure for a vacuum induction melting furnace. Background Technology

[0002] A vacuum induction melting furnace (VIM) is a device that melts metals using electromagnetic induction heating under vacuum conditions. It is widely used in the production of high-quality alloys, especially in aerospace, medical, automotive, and nuclear industries. The VIM uses medium-frequency induction heating technology, generating heat in a conductive material through an alternating electromagnetic field, thereby melting the metal. An induction coil surrounds a crucible containing the metal to be melted. When an alternating current passes through the coil, induced eddy currents are generated in the metal, rapidly heating it and melting it.

[0003] The vacuum induction melting furnace mainly consists of the following components;

[0004] Furnace body: Provides a sealed vacuum environment and is typically made of materials that are resistant to high temperatures and maintain vacuum integrity.

[0005] Medium frequency power supply: Provides the power required for induction heating, including power supply, transformer and control circuit.

[0006] Vacuum system: Composed of vacuum pump, vacuum gauge and valves, responsible for creating and maintaining a vacuum environment.

[0007] Cooling system: Typically uses water cooling channels and fans to prevent overheating.

[0008] Electrical control system: monitors and controls temperature, vacuum level and input power.

[0009] Vacuum induction melting furnaces generate a large amount of waste gas during the metal melting and casting process. This waste gas may contain metal vapor, oxides, hydrocarbons, and other harmful particles. To ensure environmental safety and operator health, these waste gases require effective filtration and treatment. Since metal melting in a vacuum induction furnace takes place within a closed vacuum chamber, the temperature inside the chamber is very high, and consequently, the temperature of the waste gas generated is also very high. To maintain the required vacuum environment for melting, the waste gas generated within the vacuum chamber of the vacuum induction melting furnace must be extracted by a vacuum pump. The high-temperature waste gas extracted from the vacuum chamber of the vacuum induction melting furnace causes significant damage to the vacuum pump, increasing the frequency of malfunctions and greatly shortening its lifespan. Current technology commonly uses a method of directly pumping the waste gas generated within the vacuum chamber of a vacuum induction melting furnace into the vacuum pump, which affects the pump's lifespan and increases the probability of malfunctions.

[0010] Chinese patent CN202323149426.7 discloses a dust removal device for smelting waste gas, relating to the field of waste gas dust removal technology. It includes a base plate, an exhaust fan mounted on the upper left side of the base plate, a mixing pipe at the exhaust fan outlet, a mixing valve in the middle of the mixing pipe, and a smelting waste gas inlet pipe above the mixing pipe. The smelting waste gas inlet pipe and the mixing pipe are fixedly connected by welding. A temperature sensor is mounted on the smelting waste gas inlet pipe to the left of the mixing pipe. This solution guides high-temperature waste gas into the device through the smelting waste gas inlet pipe. The temperature sensor detects the temperature of the high-temperature waste gas. When the set temperature is reached, the mixing valve and exhaust fan are activated, allowing cold air from outside to enter the device, thereby cooling the high-temperature waste gas and preventing damage to subsequent equipment. However, this solution has limited cooling effect through cold air, and its filtration effect on metal vapors, oxides, hydrocarbons, and other harmful particles is very limited.

[0011] Chinese patent CN202311452802.1 discloses a special alloy smelting waste gas emission device, belonging to the field of waste gas treatment equipment manufacturing. It includes: a shell, a drum, and a vibrating plate; the shell is a tubular structure with an air inlet at the bottom and an outlet at the top; the drum is rotatably and horizontally positioned in the middle of the shell, and is filled with iron particles and graphite particles; the outer wall of the drum is a mesh structure, and both sides and ends of the drum are in contact with the inner wall of the shell; a feed pipe is also provided on one side of the shell; one end of the feed pipe is equipped with a switching valve, and the other end is connected to one end of the drum through the shell; the mesh structure has multiple sieve holes, and the air inlet is connected to the outlet through these sieve holes; the vibrating plate is fixed below the drum and installed inside the shell; a vibration component is provided inside the vibrating plate. While this solution can filter particulate impurities, its filtration effect on metal vapors, oxides, hydrocarbons, and other harmful particles is very limited, and the lack of cooling measures fails to protect the vacuum pump. Utility Model Content

[0012] The utility model description section introduces a series of simplified concepts, all of which are simplifications of existing technologies in the field, and will be further explained in detail in the detailed description section. This utility model description section is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0013] The technical problem to be solved by this utility model is to provide a waste outlet structure for a vacuum induction melting furnace that can filter metal vapor, oxides, hydrocarbons and other harmful particles, and avoid reducing the service life of the vacuum pump due to high temperature.

[0014] To solve the above-mentioned technical problems, the present invention provides a waste outlet structure for a vacuum induction melting furnace, comprising:

[0015] The gas path has an inlet connected to the exhaust port of the vacuum induction melting furnace and an outlet connected to the vacuum pump via a pipeline. The shape of the gas path is not limited, and the choice should be based on ease of on-site installation. Typically, the cross-section of the gas path is circular or near-circular to avoid obstructing airflow.

[0016] A pull-out primary filter, which is formed as a high-temperature resistant filter, is inserted into the air passage on one side of the air inlet.

[0017] The cooling assembly is arranged along the airflow direction in the air passage between the removable primary filter and the removable secondary filter;

[0018] A pull-out type secondary filter, which is inserted into the air passage on the side of the air outlet;

[0019] A vacuum pump with a sealed connection to the gas outlet.

[0020] Baffles, formed on the inner wall of the gas passage and / or the outer wall of the cooling assembly, are used to increase the heat exchange area and extend the passage time of exhaust gas in the vacuum induction melting furnace.

[0021] Preferably, the waste outlet structure of the vacuum induction melting furnace is further improved because the pull-out primary filter is relatively close to one side of the vacuum induction melting furnace and needs to withstand high temperatures. Therefore, the pull-out primary filter of this invention is selected from one of the following: a ceramic filter, a high-temperature filter screen, a high-temperature bag filter, or a metal fiber filter.

[0022] Preferably, the exhaust port structure of the vacuum induction melting furnace is further improved. Because the pull-out secondary filter is relatively far from the side of the vacuum induction melting furnace, the high-temperature exhaust gas only reaches the pull-out secondary filter after being cooled by the cooling components. Therefore, the pull-out secondary filter does not need to withstand high temperatures, thus reducing costs. Correspondingly, because of the presence of the pull-out primary filter, larger particles in the high-temperature exhaust gas are filtered out by the pull-out primary filter, and the pull-out secondary filter is used for supplementary filtration to filter out smaller particles. Therefore, the pull-out secondary filter of this invention can be an electrostatic precipitator, an activated carbon filter, or a fiber filter.

[0023] Preferably, the waste outlet structure of the vacuum induction melting furnace is further improved, and the cooling assembly includes:

[0024] Multiple liquid cooling pipes are arranged parallel to each other along the airflow direction and are interconnected.

[0025] The coolant filling port is formed on the top wall of the air passage near the air inlet;

[0026] The coolant outlet is formed on the lower wall of the air passage near the air outlet.

[0027] This design allows the relatively low-temperature cooling water to preferentially exchange heat with the exhaust gas from the vacuum induction melting furnace, thus cooling down as quickly as possible.

[0028] Preferably, the structure of the waste outlet of the vacuum induction melting furnace is further improved, with the arrangement density of the liquid cooling pipes in the upper half of the gas path being greater than that in the lower half. Because high-temperature hot gas flows upwards, increasing the arrangement density of the upper half of the liquid cooling pipes significantly improves heat exchange efficiency.

[0029] Preferably, the waste outlet structure of the vacuum induction melting furnace is further improved by including:

[0030] A circulating pump is installed on the pipeline between the coolant filler port and the coolant drain port.

[0031] Preferably, the waste outlet structure of the vacuum induction melting furnace is further improved, and the turbulence-disrupting element is a plurality of non-parallel arranged fins or finned tubes.

[0032] Preferably, the waste outlet structure of the vacuum induction melting furnace is further improved, and the baffle is a hydrodynamic baffle.

[0033] Preferably, the waste outlet structure of the vacuum induction melting furnace is further improved, and the turbulence member is a spiral tube extending on the side wall of the cooling component, the spiral tube is connected to the cooling component, and coolant flows inside the spiral tube.

[0034] The working principle and technical effects of this utility model are as follows;

[0035] During the casting process of smelting metal in a vacuum induction melting furnace, a large amount of high-temperature waste gas is generated. This invention connects the gas inlet to the exhaust port of the vacuum induction melting furnace. Larger particles among the metal vapor, oxides, hydrocarbons, and other harmful particles are filtered out by a single-stage filter. After being cooled by a cooling assembly, the gas then passes through a second-stage filter, which removes smaller particles from the remaining metal vapor, oxides, hydrocarbons, and other harmful particles. At this point, due to the heat exchange between the flowing coolant in the cooling assembly and the high-temperature waste gas, the temperature of the waste gas is significantly reduced, and metal vapor, oxides, hydrocarbons, and other harmful particles are also filtered out. Therefore, the vacuum pump, which is sealed and connected to the gas outlet, can avoid damage from the high temperature and particulate matter of the waste gas, effectively extending the service life of the vacuum pump and reducing the probability of vacuum pump failure. Attached Figure Description

[0036] The accompanying drawings are intended to illustrate the general characteristics of the methods, structures, and / or materials used in specific exemplary embodiments of the present invention, supplementing the description in the specification. However, the accompanying drawings are schematic diagrams not drawn to scale and may not accurately reflect the precise structural or performance characteristics of any of the given embodiments. The accompanying drawings should not be construed as limiting or restricting the range of numerical values ​​or properties covered by the exemplary embodiments of the present invention. The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0037] Figure 1 This is a schematic diagram of the structure of the first embodiment of this utility model.

[0038] Figure 2 This is a schematic diagram of the structure of the second embodiment of this utility model.

[0039] Explanation of reference numerals in the attached figures:

[0040] Airway 1;

[0041] Air intake 1.1;

[0042] Air outlet 1.2;

[0043] 2. Removable primary filter;

[0044] Cooling component 3;

[0045] 3.1 Multiple liquid cooling pipes;

[0046] Coolant filler port 3.2;

[0047] Coolant drain outlet 3.3;

[0048] 4. Insertable secondary filter. Detailed Implementation

[0049] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can fully understand other advantages and technical effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through different specific embodiments, and various details in this specification can also be applied based on different viewpoints, with various modifications or changes made without departing from the overall design concept of the utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. The following exemplary embodiments of this utility model can be implemented in many different forms and should not be construed as limited to the specific embodiments set forth herein. It should be understood that these embodiments are provided to make the disclosure of this utility model thorough and complete, and to fully convey the technical solutions of these exemplary embodiments to those skilled in the art. It should be understood that when an element is referred to as "connected" or "combined" to another element, the element can be directly connected or combined to the other element, or there may be intermediate elements. The difference is that when an element is referred to as "directly connected" or "directly combined" to another element, there are no intermediate elements. Throughout the drawings, the same reference numerals always denote the same elements.

[0050] First embodiment, reference Figure 1 As shown, this utility model provides a waste outlet structure for a vacuum induction melting furnace, comprising:

[0051] Gas passage 1, its inlet 1.1 is connected to the exhaust port of the vacuum induction melting furnace, and its outlet 1.2 is connected to the vacuum pump through a pipeline;

[0052] The pull-out primary filter 2 is formed as a high-temperature resistant filter and is inserted into the air passage 1 on the side of the air inlet 1.1 of the air passage 1.

[0053] Cooling component 3 is arranged along the airflow direction in the air passage 1 between the removable primary filter 2 and the removable secondary filter 4;

[0054] A pull-out secondary filter 4 is inserted into the air passage 1 on the side of the air outlet 1.2;

[0055] A flow-deflecting element, formed on the inner wall of the gas passage 1 and / or the outer wall of the cooling assembly 3, is used to increase the heat exchange area and extend the passage time of exhaust gas in the vacuum induction melting furnace.

[0056] Optionally, the pull-out primary filter 2 is a ceramic filter, a high-temperature filter, a high-temperature bag filter, or a metal fiber filter, and the pull-out secondary filter 4 is an electrostatic precipitator, an activated carbon filter, or a fiber filter.

[0057] It should be noted that the cooling component in the first embodiment can be an air-cooled form, such as multiple parallel heat dissipation fins, but the technical effect is not optimal.

[0058] Second embodiment, reference Figure 2 As shown, this utility model provides a preferred embodiment of a cooling assembly that can be used in the first embodiment described above. The cooling assembly 3 includes:

[0059] Multiple liquid cooling pipes 3.1 are arranged parallel to each other along the airflow direction and are interconnected;

[0060] Coolant filler port 3.2 is formed on the top wall of air passage 1 near the air inlet 1.1;

[0061] Coolant outlet 3.3 is formed on the lower wall of air passage 1 near air outlet 1.2.

[0062] Preferably, the second embodiment described above is further improved by having a higher arrangement density of the liquid cooling pipeline in the upper half of the gas path 1 than that in the lower half of the gas path 1.

[0063] Preferably, a further improvement to the second embodiment described above includes: a circulation pump arranged on the pipeline between the coolant inlet and the coolant outlet.

[0064] Alternatively, the agitator in the first or second embodiment described above is a plurality of non-parallel arranged fins or finned tubes.

[0065] Alternatively, the aerodynamic component is a hydrodynamic aerodynamic device;

[0066] Alternatively, the turbulence element is a spiral tube extending from the side wall of the cooling assembly 3, the spiral tube being connected to the cooling assembly 3, and coolant flowing inside the spiral tube.

[0067] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It will also be understood that, unless explicitly defined herein, terms such as those defined in a general dictionary shall be interpreted as having the meaning consistent with their meaning in the relevant field context, and not as having an idealized or overly formal meaning.

[0068] The present invention has been described in detail above through specific embodiments and examples, but these are not intended to limit the present invention. Many modifications and improvements can be made by those skilled in the art without departing from the principles of the present invention, and these should also be considered within the scope of protection of the present invention.

Claims

1. A waste outlet structure for a vacuum induction melting furnace, characterized in that, include: Gas path (1), its inlet (1.1) is connected to the exhaust port of the vacuum induction melting furnace, and its outlet (1.2) is connected to the vacuum pump through a pipeline; A pull-out primary filter (2) is formed as a high-temperature resistant filter and is inserted into the air passage (1) on the side of the air inlet (1.1) of the air passage (1); Cooling assembly (3) is arranged in the air passage (1) between the removable primary filter (2) and the removable secondary filter (4) along the airflow direction; A pull-out secondary filter (4) is inserted into the air passage (1) on one side of the air outlet (1.2); A turbulence element is formed on the inner wall of the gas passage (1) and / or the outer wall of the cooling assembly (3) to increase the heat exchange area and extend the passage time of exhaust gas in the vacuum induction melting furnace.

2. The waste outlet structure of the vacuum induction melting furnace as described in claim 1, characterized in that: The pull-out primary filter (2) is a ceramic filter, a high-temperature filter, a high-temperature bag filter, or a metal fiber filter.

3. The waste outlet structure of the vacuum induction melting furnace as described in claim 1, characterized in that: The insert-type secondary filter (4) is an electrostatic precipitator, activated carbon filter or fiber filter.

4. The waste outlet structure of the vacuum induction melting furnace as described in claim 1 or 2, characterized in that, Cooling component (3) includes: Multiple liquid cooling pipes are arranged parallel to each other along the airflow direction and are interconnected. The coolant filling port is formed on the top wall of the air passage (1) near the air inlet (1.1); The coolant outlet is formed on the lower wall of the air passage (1) near the air outlet (1.2).

5. The waste outlet structure of the vacuum induction melting furnace as described in claim 4, characterized in that: The arrangement density of the liquid cooling pipeline in the upper half of the gas path (1) is greater than that of the liquid cooling pipeline in the lower half of the gas path (1).

6. The waste outlet structure of the vacuum induction melting furnace as described in claim 1 or 2, characterized in that, Also includes: A circulating pump is installed on the pipeline between the coolant filler port and the coolant drain port.

7. The waste outlet structure of the vacuum induction melting furnace as described in claim 1 or 2, characterized in that... : The spoiler is a combination of multiple non-parallel fins or finned tubes.

8. The waste outlet structure of the vacuum induction melting furnace as described in claim 1 or 2, characterized in that... : The flow-disrupting element is a hydrodynamic flow-disrupting device.

9. The waste outlet structure of the vacuum induction melting furnace as described in claim 1 or 2, characterized in that... : The turbulence-disrupting element is a spiral tube extending from the side wall of the cooling assembly (3), which is connected to the cooling assembly (3) and contains coolant.

Images