Comprehensive degassing system of refined molten aluminum for casting

Abstract

The invention relates to a comprehensive degassing system of refined molten aluminum for casting in the technical field of molten aluminum refining degassing, which comprises a liquid containing tank body and a gas transmission shaft with a hollow cavity channel, the upper end of the gas transmission shaft is driven by a driving motor to rotate, and a bubble dispersing device is mounted at the lower end of the gas transmission shaft; the bubble dispersing device comprises a second shaft sleeve, a conical flow equalizing ring disc is fixed to the second shaft sleeve, a second breathable film covers an upper conical opening of the flow equalizing ring disc in a sealing mode to form a floating cavity, a plurality of flow equalizing holes communicated with a hollow cavity channel and the floating cavity are formed in a shaft body of the gas conveying shaft, and a plurality of stirring blades are arranged on the outer edge of the flow equalizing ring disc; the middle shaft body of the gas transmission shaft is sleeved with a flow gathering cylinder cover, the lower end of the flow gathering cylinder cover is fixed to the notch end of the liquid containing groove body, the upper end shaft body of the gas transmission shaft is fixedly sleeved with a first shaft sleeve, and a plurality of exhaust fan pieces are annularly arranged on the sleeve wall of the first shaft sleeve; according to the degassing system, the argon dispersion blowing effect is improved, meanwhile, the overall exhaust effect is improved through comprehensive cooperation of multiple means, and the cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum liquid refining and degassing, in particular to a comprehensive degassing system for refined aluminum liquid used in casting. Background Art

[0002] It is well known that during the refining process of molten aluminum, due to the high temperature, a large amount of hydrogen and a small amount of oxygen are generated and absorbed. These gases will form pores during the cooling of the aluminum alloy, affecting the quality and mechanical properties of the casting. Chinese utility model patent No. CN215103464U discloses a molten aluminum degassing machine. The motor controls the rotation of a graphite rotating rod, thereby driving the rotation of stirring blades installed at the lower end of the graphite rotating rod. At the same time, the hollow part of the graphite rotating rod can be used to introduce inert gas. After the inert gas is dispersed by the stirring blade, the inert gas bubbles can be used to drive other gases to float up and be discharged by taking advantage of the inert gas's property of not dissolving and reacting with the molten aluminum. However, this prior art has two drawbacks: first, the inert gas outlet is too close to the stirring blades, causing the inert gas to be quickly dispersed and rise, thus preventing it from fully diffusing and affecting the exhaust effect. Simply increasing the stirring structure will also affect the stirring performance and service life. Second, relying solely on inert gas blowing for exhaust consumes a lot of energy and is costly. If an additional exhaust device is added, it will not only make the system complicated and take up space, but also further increase the cost. Summary of the Invention

[0003] In order to overcome the deficiencies in the background technology and solve existing technical problems, the present invention discloses a comprehensive degassing system for refined aluminum liquid for casting, which improves the inert gas dispersion blowing effect while utilizing multiple means to comprehensively coordinate and improve the overall exhaust effect and reduce costs.

[0004] To achieve the above object, the present invention adopts the following technical solutions: A comprehensive degassing system for refined aluminum liquid for casting, comprising a liquid storage tank body and a gas transmission shaft vertically mounted in the center of the notch of the liquid storage tank body, the gas transmission shaft is provided with a hollow cavity, the upper end of the gas transmission shaft is driven to rotate by a driving motor, the lower end of the gas transmission shaft extends into the groove cavity of the liquid storage tank body and is installed with a bubble diffuser; the lower end of the gas transmission shaft is close to the inner groove bottom of the liquid storage tank body and is encapsulated with a first breathable membrane, the bubble diffuser comprises a second shaft sleeve fixed to the corresponding shaft body of the gas transmission shaft, the second shaft sleeve is coaxially fixed with a flow balancing ring disk, the flow balancing ring disk is set as a conical disk with the cone head downward, The upper conical sealing cover of the flow balancing ring disk is provided with a second breathable membrane to form a floating cavity inside the flow balancing ring disk. The corresponding shaft body of the gas transmission shaft is evenly ringed with a plurality of flow balancing holes connecting the hollow cavity and the floating cavity. The outer edge of the flow balancing ring disk is evenly ringed with a plurality of stirring blades. The outer gap of the middle shaft body of the gas transmission shaft is sleeved with a flow collecting tube cover whose upper port is smaller than the lower port. The lower end of the flow collecting tube cover is adapted to be fixed to the notch end of the liquid storage tank body. The shaft body outer shell of the gas transmission shaft corresponding to the upper port of the flow collecting tube cover is fixed with a first shaft sleeve, and the sleeve wall of the first shaft sleeve is evenly ringed with a plurality of exhaust fan blades.

[0005] Furthermore, the upper end of the gas transmission shaft is rotatably fitted with a support seat, and the outer edge of the lower end of the support seat is fixed to the upper port of the concentrator cover by a plurality of frame bars; the drive motor is fixed to the outer wall of the concentrator cover through a frame, and the output shaft of the drive motor is coaxially fixed with a driving wheel, and the corresponding shaft body of the gas transmission shaft is coaxially fixed with a driven wheel that is transmission-connected to the driving wheel.

[0006] Furthermore, the diameter of the flow balancing ring disk is 0.3 to 0.4 times the inner diameter of the liquid storage tank body, and the height of the flow balancing ring disk from the inner tank bottom of the liquid storage tank body is 0.8 to 1.2 times the diameter of the flow balancing ring disk.

[0007] Furthermore, the first breathable membrane and the second breathable membrane are both configured as high-temperature resistant ceramic permeable membranes or silicon carbide permeable membranes.

[0008] Furthermore, the air permeability of the first breathable membrane is greater than that of the second breathable membrane.

[0009] Furthermore, two stirring vertical plates are symmetrically fixed on the two ends of the upper disk surface of the flow balancing ring disk.

[0010] Furthermore, the lower end of the gas transmission shaft is connected to a flaring nozzle.

[0011] Furthermore, an intermediate support corresponding to the gas transmission shaft is installed on the inner wall of the converging tube cover close to the lower port.

[0012] Furthermore, a sealing ring is provided on the end surface of the notch of the liquid storage tank body, and the sealing ring is detachably connected to the lower end of the focusing tube cover and the upper end notch of the liquid storage tank body through fastening bolts.

[0013] Furthermore, the degassing system also includes a nitrogen cylinder, an argon cylinder, a proportioning box and a rotary joint. The wall of the proportioning box is installed with a pressure gauge, a main regulating valve and two branch regulating valves. The two branch regulating valves are respectively connected to the outlets of the nitrogen cylinder and the argon cylinder through hard pipes. The main regulating valve is connected to one end of the rotary joint through a hose, and the other end of the rotary joint is fixedly connected to the upper port of the gas transmission shaft.

[0014] Due to the adoption of the above-mentioned technical solution, the present invention has the following beneficial effects: The comprehensive degassing system for refined molten aluminum for casting disclosed by the present invention can deliver inert gas from the top of the gas delivery shaft and discharge it through the first and second gas permeable membranes to prevent the aluminum liquid from flowing back. The inert gas discharged from the bottom can first collide with the inner bottom of the liquid storage tank body to be dispersed once, and then disperse to the stirring blades under the obstruction of the flow-equalizing ring disk to be dispersed again, expanding outward in a fan shape. The inert gas discharged from the second gas permeable membrane directly merges and floats from the top of the stirrer, so that more inert gas bubbles can be evenly dispersed in the aluminum liquid and almost spread throughout the liquid storage tank body. The fusion drives more gas that needs to be removed to rise and be discharged, greatly improving the blowing and exhaust effect of the inert gas. The floating cavity formed by the flow-equalizing ring disk can also generate lift in the aluminum liquid for the stirring and bubble-dispersing mechanism, thereby improving the stirring performance and service life. The comprehensive degassing system for refined molten aluminum for casting disclosed by the present invention guides the gas to the exhaust fan blades through the focusing tube cover, so that the exhaust fan blades can produce the effect of outward suction when rotating with the gas transmission shaft, thereby accelerating the gas discharge. It can not only realize multiple uses of one shaft, simplify the design and realize synchronous control, but more importantly, it can reduce the use of inert gas according to actual conditions, and only rely on the stirring of the stirring blades and the suction negative pressure effect of the exhaust fan blades to carry out the degassing of the molten aluminum, thereby greatly reducing energy consumption, reducing costs, and increasing the application possibilities of various deployment uses, so that it can be more suitable for the needs of molten aluminum refining treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the implementation structure of the present invention; Figure 2 It is a three-dimensional schematic diagram of a connection structure between the gas transmission shaft and the bubble diffuser; Figure 3 1. It is a three-dimensional schematic diagram of the connection structure of the focusing tube cover; Figure 4 It is a schematic diagram of the connection structure of the nitrogen cylinder and the argon cylinder.

[0016] In the figure: 1. Liquid storage tank; 2. Gas transmission shaft; 3. Driving motor; 4. Converging tube cover; 5. Second shaft sleeve; 6. Flow balancing ring; 7. Stirring blade; 8. First breathable membrane; 9. First shaft sleeve; 10. Exhaust fan; 11. Support seat; 12. Frame; 13. Driving wheel; 14. Driven wheel; 15. Frame; 16. Fastening bolt; 17. Sealing ring; 18. Flow balancing hole; 19. Floating chamber; 20. Second breathable membrane; 21. Intermediate support; 22. Rotary joint; 23. Nitrogen cylinder; 24. Argon cylinder; 25. Proportioning box; 26. Main regulating valve; 27. Branch regulating valve; 28. Pressure gauge; 29. Hard pipe; 30. Hose; 31. Stirring vertical plate. DETAILED DESCRIPTION

[0017] The technical solution of the present invention will be described below in conjunction with the drawings in the embodiments of the present invention. In the description, it should be understood that if there are terms such as "upper", "lower", "front", "back", "left", and "right" indicating directions or positional relationships, they only correspond to the drawings of the present invention and are for the convenience of describing the present invention, and do not indicate or imply that the device or component referred to must have a specific direction. Example 1:

[0018] Combined with attachment Figure 1-3 The comprehensive degassing system for refined aluminum liquid for casting comprises a liquid storage tank body 1 and a gas transmission shaft 2 vertically mounted in the center of the notch of the liquid storage tank body 1. The gas transmission shaft 2 is provided with a hollow cavity so that the gas transmission shaft 2 can be used to introduce inert gas. The upper end of the gas transmission shaft 2 is driven to rotate by a drive motor 3. As needed, the upper end of the gas transmission shaft 2 is rotatably fitted with a support seat 11. The upper end of the gas transmission shaft 2 is generally provided with a shoulder. The support seat 11 is provided with a radial bearing and a thrust bearing to rotatably support the shoulder position of the gas transmission shaft 2. The specific support structure is prior art and will not be described in detail here. ; The outer edge of the lower end of the support seat 11 is fixed to the upper port of the focusing tube cover 4 through a plurality of frame bars 12. Generally, three or four frame bars 12 are evenly arranged around the ring to ensure a stable connection while preventing the upper port of the focusing tube cover 4 from being blocked, so that the gas can flow out from the upper port of the focusing tube cover 4; the drive motor 3 is fixed to the outer wall of the focusing tube cover 4 through the frame 15, and the output shaft of the drive motor 3 is coaxially fixed with a driving wheel 13, and the corresponding shaft body of the gas transmission shaft 2 is coaxially fixed with a driven wheel 14 corresponding to the driving wheel 13. When the drive motor 3 and the gas transmission shaft 2 are coaxially arranged, as shown in the attached Figure 1 As shown, the driving wheel 13 and the driven wheel 14 can be configured as a gear meshing transmission or a belt transmission. When the driving motor 3 is arranged perpendicular to the gas transmission shaft 2, a bevel gear transmission needs to be configured; The lower end of the gas transmission shaft 2 extends into the groove cavity of the liquid storage tank body 1 and is installed with a bubble disperser; the lower end of the gas transmission shaft 2 is close to the inner groove bottom of the liquid storage tank body 1 and is encapsulated with a first gas permeable membrane 8. The first gas permeable membrane 8 is generally set as a high-temperature resistant ceramic permeable membrane or a silicon carbide permeable membrane, which is used to block the liquid through the gas, and the inert gas ejected through the first gas permeable membrane 8 hits the inner groove bottom of the liquid storage tank body 1 and can be dispersed and rise; according to needs, the lower end of the gas transmission shaft 2 is connected with a flaring nozzle to increase the gas discharge volume and diffusion area; the bubble disperser includes a sleeve fixed to the corresponding gas transmission shaft 2. The second sleeve 5 of the shaft body is coaxially fixed with a flow-distributing ring disk 6. The flow-distributing ring disk 6 can change the rising path of the inert gas ejected from the lower port of the gas transmission shaft 2, so that the inert gas first diffuses radially and then rises, thereby increasing the dispersion effect in the aluminum liquid; therefore, it is not appropriate to design the flow-distributing ring disk 6 too large or too small, too high or too low. Specifically, the diameter of the flow-distributing ring disk 6 can be set to 0.3 to 0.4 times the inner diameter of the liquid storage tank body 1, and the height of the flow-distributing ring disk 6 from the inner tank bottom of the liquid storage tank body 1 is 0.8 to 1.2 times the diameter of the flow-distributing ring disk 6; Figure 1 As shown, the flow-balancing ring disk 6 is configured as a conical disk with a downward-pointing cone head. The conical disk can guide and diffuse bubbles upward, preventing bubbles from lingering on the lower disk surface of the flow-balancing ring disk 6. At the same time, the conical structure is also conducive to flow diversion and reduces rotational resistance. The upper cone-shaped sealing cover of the flow-balancing ring disk 6 is provided with a second air-permeable membrane 20, so that a float cavity 19 is formed in the flow-balancing ring disk 6. The float cavity 19 can reduce the sinking force of the entire bubble disperser in the aluminum liquid, thereby alleviating the axial burden of the gas transmission shaft 2, ensuring more flexible rotation, less loss, and longer service life. In addition, the air permeability of the first air permeable membrane is greater than that of the second air permeable membrane, ensuring a greater gas flow rate ejected from the lower end of the gas transmission shaft 2. The corresponding shaft body of the gas transmission shaft 2 is evenly ringed with multiple flow-equalizing holes 18 connecting the hollow cavity and the float chamber 19. The inert gas in the hollow cavity can enter the float chamber 19 through the flow-equalizing holes 18 and then be discharged through the second air permeable membrane 20, directly merging and floating above the agitator and bubble disperser. The outer edge of the flow-equalizing ring disk 6 is evenly ringed with multiple stirring blades 7, which can further disperse the rising inert gas during rotation. As attached Figure 2 As shown, as needed, two stirring vertical plates 31 are symmetrically fixed at the two ends of the upper surface of the flow-distributing ring plate 6. Since the bubble disperser is disposed as a whole near the lower part of the liquid tank 1, the stirring vertical plates 31 can increase the disturbance of the aluminum liquid in the middle and upper parts, thereby enhancing the effect of the inert gas fully contacting and fusing with other gases. The outer gap of the middle shaft of the gas transmission shaft 2 is covered with a flow collecting cover 4 whose upper port is smaller than the lower port. Figure 1As shown, the side wall of the converging tube cover 4 is inclined to transition, so that the upper port and the lower port maintain a straight pipe section, and the lower end of the converging tube cover 4 is adapted to be fixed to the notch end of the liquid storage tank body 1, so that the gas discharged from the liquid storage tank body 1 can be guided to the upper port through the converging tube cover 4 and converged and flowed out; according to needs, a sealing ring 17 is provided on the notch end face of the liquid storage tank body 1, and the sealing ring 17 is detachably connected to the lower end of the converging tube cover 4 and the upper end notch of the liquid storage tank body 1 through a fixing bolt 16, specifically, an outer flange is provided on the outer edge of the lower port of the converging tube cover 4, and corresponding perforations are provided on the outer flange and the sealing ring 17, so that the liquid storage tank body 1 can be discharged. The upper end surface of the trough body 1 is provided with corresponding through-holes for screwing the fastening bolts 16, so that the gas transmission shaft 2, the bubble diffuser and the driving motor 3 installed thereon, which are connected to the converging cylinder cover 4, can be detachably installed together; the shaft body outer shell of the gas transmission shaft 2 corresponding to the upper end of the converging cylinder cover 4 is fixed with a first shaft sleeve 9, and the sleeve wall of the first shaft sleeve 9 is evenly ringed with multiple exhaust fan blades 10. The outer end of the exhaust fan blade 10 is close to the inner edge of the upper end of the converging cylinder cover 4, so that when it can be driven to rotate by the gas transmission shaft 2, a structure similar to an exhaust fan is formed, which has the effect of exhausting air and can even form a certain negative pressure in the liquid tank body 1.

[0019] The comprehensive degassing system for refined aluminum liquid for casting of the present invention is implemented. The refined aluminum liquid is filled in the liquid holding tank body 1, and then the driving motor 3 is started. The stirring blade 7 and the exhaust fan blade 10 are driven to rotate through the gas delivery shaft 2. With the support of the conical flow-averaging ring disk 6 and the float chamber 19, the stirring is smoother and more flexible, so that the stirring and exhaust are first performed to discharge the gas that is easily discharged in the aluminum liquid. At the same time, the exhaust fan blade 10 rotates to exhaust. As the speed increases, it can even achieve the effect of pumping air to form a negative pressure, thereby accelerating the discharge of gas in the aluminum liquid. If the requirements for the use of the aluminum liquid are not high, a certain degassing requirement can be met at this time, and there is no need to subsequently introduce inert gas, thereby saving energy and reducing costs. If the requirements for the use of the aluminum liquid are high, it is necessary to simultaneously introduce inert gas, such as nitrogen or argon, from the upper end of the gas delivery shaft 2, so that after the inert gas is discharged from the first gas permeable membrane 8 and the second gas permeable membrane 20, after multiple sufficient dispersions, it can fuse more gas in the aluminum liquid and drive it to float and discharge, thereby achieving a better exhaust effect. Example 2:

[0020] Due to the high density of aluminum liquid and the long distance of the gas transmission shaft 2, the axial force, swing force and torque on the gas transmission shaft 2 will increase during the stirring process, resulting in a short service life of the entire rotating system and the need for frequent maintenance and replacement. Figure 1 As shown, the difference from Example 1 is that an intermediate support 21 corresponding to the gas transmission shaft 2 is installed on the inner wall of the converging tube cover 4 near the lower port. The intermediate support 21 includes a limit sleeve rotatably sleeved on the gas transmission shaft 2. The limit sleeve is fixed to the cover wall of the converging tube cover 4 through a cross bar. The limit sleeve can ensure the stable rotation of the gas transmission shaft 2 and prevent radial swing. Example 3:

[0021] The inert gases used for blowing and exhaust are generally nitrogen and argon. Nitrogen is low in cost and non-reactive, but its solubility in molten aluminum is slightly higher than that of argon, and bubble control is more difficult. Although argon is more stable and more suitable for high-precision casting, it is more difficult to obtain and has a higher cost. Therefore, it is often necessary to use it in combination according to the requirements of the molten aluminum; as shown in the attached Figure 4 As shown, on the basis of Example 1, the degassing system further includes a nitrogen cylinder 23, an argon cylinder 24, a proportioning box 25 and a rotary joint 22. The wall of the proportioning box 25 is equipped with a pressure gauge 28, a main regulating valve 26 and two branch regulating valves 27. The two branch regulating valves 27 are respectively connected to the outlets of the nitrogen cylinder 23 and the argon cylinder 24 through hard pipes 29. The main regulating valve 26 is connected to one end of the rotary joint 22 through a hose 30. The other end of the rotary joint 22 is fixedly connected to the upper port of the gas transmission shaft 2. The rotary joint 22 can Ensure that when the gas transmission shaft 2 rotates, the hose 30 will not rotate accordingly; when adjusting the gas ratio, it is necessary to first open and adjust the branch regulating valve 27 of the nitrogen bottle 23, and then open the main regulating valve 26 to a certain exhaust volume. At this time, the pressure gauge 28 will display a certain pressure index, and then open and adjust the branch regulating valve 27 of the argon bottle 24. According to the pressure change of the pressure gauge 28, the amount of argon added is judged to a certain ratio. The ratio is an approximate ratio and does not need to be too precise; of course, it is also possible to use only nitrogen or argon without ratioing.

[0022] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the above-mentioned embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the appended claims rather than the above description. Therefore, it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure marks in the claims should not be regarded as limiting the content of the claims involved.

Claims

1. A comprehensive degassing system for refined aluminum liquid for casting, comprising a liquid storage tank and a gas delivery shaft vertically mounted in the center of a slot opening of the liquid storage tank. The gas delivery shaft has a hollow cavity. The upper end of the gas delivery shaft is driven to rotate by a drive motor. The lower end of the gas delivery shaft extends into the slot cavity of the liquid storage tank and is equipped with a bubble diffuser. The system is characterized by: The cam is secured to the bottom of the airtight container and is adapted to connect the air duct to the outer cover of the container, wherein the cam is secured to the bottom of the containers and is adapted to connect the air duct to the outer cover of the container.

2. The comprehensive degassing system for refined aluminum liquid for casting according to claim 1, characterized in that: The upper end of the gas transmission shaft is rotatably fitted with a support seat, and the outer edge of the lower end of the support seat is fixed to the upper port of the concentrator cover by a plurality of frame bars; the driving motor is fixed to the outer wall of the concentrator cover through a frame, and the output shaft of the driving motor is coaxially fixed with a driving wheel, and the corresponding shaft body of the gas transmission shaft is coaxially fixed with a driven wheel that is transmission-connected to the driving wheel.

3. The comprehensive degassing system for refined aluminum liquid for casting according to claim 1, characterized in that: The diameter of the flow-distributing ring disk is 0.3 to 0.4 times the inner diameter of the liquid storage tank body, and the height of the flow-distributing ring disk from the inner tank bottom of the liquid storage tank body is 0.8 to 1.2 times the diameter of the flow-distributing ring disk.

4. The comprehensive degassing system for refined aluminum liquid for casting according to claim 1, characterized in that: The first breathable membrane and the second breathable membrane are both configured as high-temperature resistant ceramic permeable membranes or silicon carbide permeable membranes.

5. The comprehensive degassing system for refined aluminum liquid for casting according to claim 1, characterized in that: The air permeability of the first breathable membrane is greater than that of the second breathable membrane.

6. The comprehensive degassing system for refined aluminum liquid for casting according to claim 1, characterized in that: Two stirring vertical plates are symmetrically fixed on the two ends of the upper disk surface of the flow-evening ring disk.

7. The comprehensive degassing system for refined aluminum liquid for casting according to claim 1, characterized in that: The lower end of the gas transmission shaft is connected with a flaring nozzle.

8. The comprehensive degassing system for refined aluminum liquid for casting according to claim 1, characterized in that: An intermediate support corresponding to the gas transmission shaft is installed on the inner wall of the converging tube cover close to the lower port.

9. The comprehensive degassing system for refined aluminum liquid for casting according to claim 1, characterized in that: The notch end surface of the liquid storage tank body is provided with a sealing ring, and the sealing ring is detachably connected to the lower end of the concentrating tube cover and the upper end notch of the liquid storage tank body through fastening bolts.

10. The comprehensive degassing system for refined aluminum liquid for casting according to claim 1, characterized in that: The degassing system also includes a nitrogen cylinder, an argon cylinder, a proportioning box and a rotary joint. The wall of the proportioning box is installed with a pressure gauge, a main regulating valve and two branch regulating valves. The two branch regulating valves are respectively connected to the outlets of the nitrogen cylinder and the argon cylinder through hard pipes. The main regulating valve is connected to one end of the rotary joint through a hose, and the other end of the rotary joint is fixedly connected to the upper port of the gas transmission shaft.

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