Positive and negative pressure double-acting liquid-phase metal melt bipolar filter for removing impurities

Abstract

The utility model discloses a positive pressure and negative pressure double -acting liquid phase metal melt bipolar filter impurity removal device, its characterized in that: including filter box, the wallboard of separating filter box into first filter box and second filter box, the metal melt import of setting first filter box and second filter box intercommunication in the bottom of wallboard and respectively independent with first filter box and second filter box intercommunication import flow groove and export flow groove, two ends of wallboard are respectively in the inner chamber bottommost and the topmost of first filter box, still install the vacuumizing device of second filter box and first filter box from its formation negative pressure on second filter box, install the coarse filter device of metal melt filtration in first filter box, install fine filter device in second filter box. The utility model discloses through import flow groove and export flow groove independent setting on first filter box and second filter box, avoid using integrated flow groove because of the seal not strict between gate and flow groove, cause metallurgical defect when casting product.

Description

Technical Field

[0001] This utility model relates to the field of impurity removal technology for molten metal, specifically to a device for removing impurities from a double-stage liquid-phase molten metal using a dual-action positive and negative pressure filtration system. Background Technology

[0002] For example, the invention patent authorized on May 15, 2020, with authorization announcement number CN107208179B, discloses an apparatus and method for removing unwanted inclusions from molten metal. The apparatus includes: a container having a metal shell and an internal structure made of a heat-resistant, insulating, and refractory material; a lid removably disposed on top of the container to keep the container sealed; the container having: an inlet chamber having an inlet opening to receive metal from a metal supply tank; and an outlet chamber having an outlet opening; an air evacuation device and a refractory filter are provided in the inlet chamber and / or the outlet chamber; the apparatus includes means for initiating the refractory filter by molten metal flowing in the opposite direction to the molten metal flow during filtration; the inlet chamber and the outlet chamber are arranged side by side and separated by a partition wall extending upward from the bottom of the container to a predetermined height; the container is connected parallel to the metal supply tank via transverse metal channel short posts, the channel short posts being disposed between the inlet opening and the outlet opening and the supply tank, respectively; the supply tank having a valve device near the outlet of the container and another valve device between the two channel short posts;

[0003] The above-mentioned technical solution using only a single negative pressure employs an integrated flow channel equipped with multiple gate devices. Because these gates operate within the molten metal, gaps inevitably arise between the gates and the flow channel due to incomplete sealing. These gaps are undetectable during actual molten metal production, causing the inlet molten metal to flow directly to the outlet without passing through a filtration device. This results in metallurgical defects in the casting products, causing fatal damage to high-precision and advanced casting products. Simultaneously, the incomplete sealing during casting process draws in a large amount of air, significantly weakening the vacuum suction function and affecting the vacuum level, thus severely interfering with the formation of negative vacuum pressure.

[0004] Moreover, the heating device is installed on the cover of the filter box at the top of the filter box. When the heating device heats the inside of the box, it is easy to cause uneven heating of the molten metal. As a result, the inside of the filter box is prone to blockage due to the solidification of the molten metal and reduced casting effect.

[0005] Meanwhile, the filter box design in the above scheme only has single-stage filtration, so the quality requirements of the molten metal in the preceding process are very high. If the quality of the molten metal in the preceding process is poor, it is very easy to cause clogging of the filter device. To address this, a device for removing impurities by bipolar filtration of liquid-phase molten metal under positive and negative pressure is proposed. Summary of the Invention

[0006] The purpose of this invention is to solve the above problems by proposing a device for removing impurities through a dual-acting positive and negative pressure liquid-phase metal melt bipolar filtration.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a device for bipolar filtration of liquid-phase molten metal under positive and negative pressure, characterized in that: it includes a filter box, a wall plate dividing the filter box into a first filter box and a second filter box, a molten metal channel connected to the first filter box and the second filter box at the bottom of the wall plate, an inlet channel independently connected to the first filter box, and an outlet channel independently connected to the second filter box; a vacuum suction device for creating negative pressure in the first filter box and the second filter box is connected to the first filter box and the second filter box via pipelines; a coarse filtration device for filtering the molten metal is installed in the first filter box, and a fine filtration device for filtering the molten metal is installed in the second filter box.

[0008] Preferably, the first filter box is provided with an inlet communicating with the inlet channel, and the second filter box is provided with an outlet communicating with the outlet channel; the inlet channel is also provided with a channel inlet corresponding to the inlet, and the outlet channel is provided with a channel outlet corresponding to the outlet.

[0009] Preferably, the system also includes a positive pressure device capable of injecting inert gas into the first filter box and / or the second filter box; the positive pressure device includes a positive pressure injection pipe that is connected to the first filter box and the second filter box respectively and injects inert gas into the first filter box and the second filter box, a control valve connected to the injection pipe, and a gas source pipe connected to the control valve.

[0010] Preferably, both the inlet and outlet flow channels are equipped with sealing devices and metal liquid level rangefinders for real-time monitoring of the molten metal level, and the first and / or second filter boxes are also equipped with metal liquid level rangefinders.

[0011] Preferably, the sealing device includes a connecting rod installed on the first filter box and the second filter box, a sealing block installed on one end of the connecting rod, a drive source connected to the other end of the connecting rod to drive the connecting rod to move, and a support rod supporting the connecting rod.

[0012] Preferably, the bottom of the second filter box is provided with a flow guide groove, which causes the molten metal flowing in from the molten metal channel to flow in the following directions in sequence: vertically upward, horizontally to the side, vertically downward, and horizontally to the side before flowing to the outlet.

[0013] Preferably, the first and second filter boxes are each equipped with a flip-up lid; the lid is equipped with a high-temperature resistant sealing ring and a high-temperature fireproof groove; the high-temperature fireproof groove is filled with rope-shaped high-temperature material.

[0014] Preferably, both the first and second filter boxes are equipped with a flip guide seat to facilitate the flipping of the box cover and a second drive source to drive the flipping of the box cover.

[0015] Preferably, the system also includes a movable preheating device disposed at the inlet and / or outlet of the flow channel for preheating the first filter box and / or the second filter box.

[0016] The beneficial effects of this utility model are as follows: by using a vacuum suction device to create a vacuum in the first and second filter boxes to form a negative pressure, the molten metal is guided by negative pressure. The molten metal is guided by negative pressure and passes through the coarse and fine filtration devices in the first and second filter boxes in sequence, thereby improving the quality and purification effect of the molten metal.

[0017] By repeatedly switching between the vacuum suction device and the positive pressure device, the flow rate of the molten metal through the filter device is accelerated, the flow rate of the molten metal is increased, so that the molten metal passing through the filter device can meet the flow rate required for casting, and the service life of the coarse filter and the fine filter is extended.

[0018] By independently setting the inlet and outlet flow channels on the first and second filter boxes respectively, the problem of unfiltered molten metal flowing directly to the outlet due to poor sealing between the gate and the flow channel, as is the case with integrated flow channels, is avoided. This prevents metallurgical defects in casting products and can cause fatal damage to high-precision and advanced casting products. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the present invention.

[0020] Figure 2 This is a cross-sectional view of the filter box of this utility model.

[0021] Figure 3 This is a cross-sectional view of the first filter box of this utility model.

[0022] Figure 4 This is a cross-sectional view of the second filter box of this utility model.

[0023] Figure 5 This is a structural schematic diagram of the box cover of this utility model.

[0024] Figure 6 This is a partial structural schematic diagram of the present invention.

[0025] Legend: 0. Filter box; 1. First filter box; 101. Inlet channel; 102. Coarse filter device; 103. Wall panel; 104. Liquid inlet; 105. Channel inlet; 2. Second filter box; 201. Outlet channel; 202. Fine filter device; 203. Guide channel; 204. Liquid outlet; 205. Channel outlet; 3. Box cover; 301. High-temperature resistant sealing ring; 302. High-temperature fireproof tank; 303. Tilting guide seat; 304. Drive source two; 4. Metal melt channel; 5. Vacuum suction device; 6. Positive pressure device; 601. Positive pressure charging pipe; 602. Control valve; 7. Sealing device; 701. Connecting rod; 702. Sealing block; 703. Drive source; 704. Support rod; 8. Metal liquid level measuring device. Detailed Implementation

[0026] The following description, in conjunction with the accompanying drawings, further illustrates the apparatus for removing impurities from a double-acting liquid-phase metal melt using positive and negative pressure dual-effect filtration.

[0027] It should be noted that all directional indicators such as up, down, left, right, front, back, etc. in the embodiments of this utility model are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indicator will also change accordingly.

[0028] See appendix Figure 1-6 As shown, this embodiment of the apparatus for bipolar filtration of liquid-phase molten metal under positive and negative pressure is characterized by: a filter box 0, a wall panel 103 dividing the filter box 0 into a first filter box 1 and a second filter box 2, a molten metal channel 4 disposed at the bottom of the wall panel 103 connecting the first filter box 1 and the second filter box 2, an inlet channel 101 independently connected to the first filter box 1, and an outlet channel 201 independently connected to the second filter box 2; a vacuum suction device 5 for creating negative pressure on the first filter box 1 and the second filter box 2 is connected to the first filter box 1 and the second filter box 2 by pipelines; a coarse filter device 102 for filtering the molten metal is installed in the first filter box 1, and a fine filter device 202 for filtering the molten metal is installed in the second filter box 2; the filter box 0 is a box with a heat-insulating structure; the fine filter device 202 and the coarse filter device 102 can be ceramic filters or other filters with filtering effects.

[0029] By using the vacuum suction device 5 to create a vacuum in the first filter box 1 and the second filter box 2 to draw negative pressure, the molten metal is guided by negative pressure. The molten metal is then guided by negative pressure to pass through the coarse filter device 102 and the fine filter device 202 in the first filter box 1 and the second filter box 2 in sequence, so as to perform coarse filtration and fine filtration on the molten metal, thereby improving the quality and purification effect of the molten metal.

[0030] By independently setting the inlet trough 101 and the outlet trough 201 on the first filter box 1 and the second filter box 2 respectively, the use of an integrated trough is avoided. This prevents the unfiltered molten metal from flowing directly to the outlet due to poor sealing between the gate and the trough, which could cause metallurgical defects in the casting process and cause fatal damage to high-precision and advanced casting products.

[0031] See appendix Figure 3-4 As shown, the first filter box 1 is provided with an inlet 104 communicating with the inlet channel 101, and the second filter box 2 is provided with an outlet 204 communicating with the outlet channel 201; the inlet channel 101 is also provided with a channel inlet 105 corresponding to the inlet 104, and the outlet channel 201 is provided with a channel outlet 205 corresponding to the outlet 204.

[0032] See appendix Figure 1 As shown, it also includes a positive pressure device 6 capable of injecting inert gas into the first filter box 1 and / or the second filter box 2; the positive pressure device 6 includes a positive pressure injection pipe 601 connected to the first filter box 1 and the second filter box 2 respectively and injecting inert gas into the first filter box 1 and the second filter box 2, a control valve 602 connected to the positive pressure injection pipe 601, and a gas source pipe connected to the control valve 602; by switching the control valve 602, the inert compressed gas in the gas source connected to the gas source pipe is transported through the positive pressure injection pipe 601 to the first filter box 1 and / or the second filter box 2, thereby improving the performance of the first filter box 1. The filter box 1 and / or the second filter box 2 are filled with positive pressure to reduce the height of the molten metal in the box. Then the positive pressure device 6 stops working and the vacuum suction device 5 is started to increase the height of the molten metal in the box. By repeatedly switching between the vacuum suction device 5 and the positive pressure device 6, the positive and negative pressure are repeatedly switched, thereby ensuring the smooth flow rate of the filter channels of the coarse filter device 102 and the fine filter device 101, accelerating the flow rate of the molten metal through the filter device, increasing the flow rate of the molten metal, and at the same time extending the service life of the coarse filter device 102 and the fine filter device 101.

[0033] See appendix Figure 3-4 As shown, both the inlet flow channel 101 and the outlet flow channel 201 are equipped with a sealing device 7 and a metal liquid level measuring device 8 for real-time monitoring of the molten metal level. The first filter box 1 and / or the second filter box 2 are also equipped with a metal liquid level measuring device 8. The metal liquid level measuring device 8 monitors the height of the molten metal level in the inlet flow channel 101 and the outlet flow channel 201 in real time, thereby facilitating real-time monitoring of the molten metal level in the inlet flow channel 101 and the outlet flow channel 201.

[0034] See appendix Figure 3-4As shown, the sealing device 7 includes a connecting rod 701 mounted on the first filter box 1 and the second filter box 2, a sealing block 702 mounted on one end of the connecting rod 701, a drive source 703 connected to the other end of the connecting rod 701 to drive the connecting rod 701 to move, and a support rod 704 supporting the connecting rod 701. The drive source 703 drives one end of the connecting rod 701 to move, and the connecting rod 701 drives the sealing block 702 to open or seal the inlet flow channel 101 and the outlet flow channel 201, thereby facilitating the opening or sealing of the inlet flow channel 101 and the outlet flow channel 201.

[0035] See appendix Figure 4 As shown, the bottom of the second filter box 2 is provided with a flow guide trough 203. The flow guide trough 203 causes the molten metal flowing in from the molten metal channel 4 to flow in the following directions: vertically upward, horizontally to the side, vertically downward, and horizontally to the side, before flowing to the outlet 204. By using the flow guide trough 203 to guide the molten metal entering the second filter box 2, the molten metal is filtered by the fine filter device 202 and then flows to the outlet flow channel 201.

[0036] See appendix Figure 5 As shown, the first filter box 1 and the second filter box 2 are respectively equipped with flip-up lids 3; the lids 3 are equipped with high-temperature resistant sealing rings 301 and high-temperature fireproof grooves 302; the high-temperature fireproof grooves 302 are filled with rope-like high-temperature material; by using the high-temperature resistant sealing rings 301 and the rope-like high-temperature material in the high-temperature fireproof grooves 302 to perform double sealing between the lids 3 and the first filter box 1 and the second filter box 2, the sealing strength between the first filter box 1 and the second filter box 2 and the lids 3 is improved.

[0037] See appendix Figure 6 As shown, both the first filter box 1 and the second filter box 2 are equipped with a flip guide seat 303 to facilitate the flipping of the box cover 3 and a second drive source 304 to drive the flipping of the box cover 3; a rotating pin is installed between the flip guide seat 303 and the box cover 3; the second drive source 304 drives the box cover 3 to flip along the flip guide seat 303, thereby facilitating the opening or closing of the box cover 3.

[0038] See appendix Figure 1 As shown, it also includes a movable preheating device for preheating the first filter box 1 and / or the second filter box 2 at the inlet 105 and / or outlet 205 of the flow channel; the heating device can be selected from one of an electric heating rod device or a natural gas nozzle heating device; by using the heating device to heat the first filter box 1 and the second filter box 2 at the inlet 104 of the inlet flow channel 101 and the outlet 204 of the outlet flow channel 201 respectively, the molten metal inside the first filter box 1 and the second filter box is better kept warm, thereby improving the process conditions for multiple castings.

[0039] In the working process of this utility model, firstly, the heating device heats the first filter box 1 and the second filter box 2 at the inlet 104 of the inlet channel 101 and the outlet 204 of the outlet channel 201, respectively. After heating, the drive source 304 drives the box cover 3 to flip and close the box cover 3 along the flip guide seat 303. Then, the drive source 703 in the sealing device 7 at the inlet channel 101, which is separately connected to the first filter box 1, drives one end of the connecting rod 701 to move. The connecting rod 701 drives the sealing block 702 to block the inlet channel 101. The outlet flow channel 202 of the second filter box 2 is kept blocked while the molten metal flows from the inlet flow channel 101 through the inlet 105 and the liquid inlet 104 into the first filter box 1. When the molten metal level measuring device 8 at the top of the inlet flow channel 101 detects that the height of the molten metal flowing naturally in the inlet flow channel 101 has reached the set height value, the vacuum suction device 5 is turned on to perform vacuum suction on the first filter box 1. The molten metal inside the first filter box 1 is then guided by negative pressure through vacuum suction.

[0040] The molten metal drawn in under negative pressure passes through the coarse filter 102 in the first filter box 1. The coarse filter 102 filters impurities in the molten metal, intercepting impurities larger than 20 micrometers. The filtered molten metal then flows through the molten metal channel 4 to the guide channel 203 in the second filter box 2. The liquid level of the molten metal in the guide channel 203 rises and undergoes secondary filtration through the fine filter 202, intercepting impurities smaller than 20 micrometers. When the molten metal level measuring device 8 in the second filter box 2 detects the molten metal... When the liquid level of the body reaches the set height, the vacuum suction device 5 performs vacuum suction on the second filter box 2, the sealing device 7 at the outlet flow channel 201 works, the drive source 703 drives one end of the connecting rod 701 to move, the connecting rod 701 drives the sealing block 702 to open the outlet flow channel 201, and the molten metal after coarse and fine filtration flows through the liquid outlet 204 and the flow channel outlet 205 into the outlet flow channel 201 and then enters the casting stage. At this time, the liquid level of the molten metal at the inlet flow channel 101 is the same as the liquid level of the molten metal at the outlet flow channel 201.

[0041] When the molten metal level at the outlet flow channel 201 is lower than the molten metal level at the inlet flow channel 101, the sealing device 7 controlling the inlet flow channel 101 controls the flow of the molten metal.

[0042] Then, the vacuum suction device 5 stops working, and the positive pressure device 6 is activated. By opening the control valve 602, inert gas enters the positive pressure filling pipe 601, filling the first filter box 1 and / or the second filter box 2 with inert gas. This increases the pressure in the first filter box 1 and the second filter box 2, squeezing the molten metal downwards. The molten metal in the second filter box 2 flows into the first filter box 1, and the molten metal in the first filter box 1 flows to the inlet channel 101, lowering the height of the molten metal in the box. As the pressure compresses the molten metal, it passes through the coarse filter device 102 and the fine filter device 101, and then rises. The filtration channel's flow rate is improved. Then, the positive pressure device 6 stops working, and the vacuum suction device 5 is activated to increase the height of the molten metal in the tank. Through the repeated switching between the vacuum suction device 5 and the positive pressure device 6, the positive and negative pressures are repeatedly switched, thereby ensuring the filtration channel's flow rate of the coarse filter 102 and the fine filter 101, accelerating the flow rate of the molten metal through the filter, and increasing the flow rate of the molten metal, so that the molten metal passing through the filter can meet the flow rate required for the casting stage; at the same time, it extends the service life of the coarse filter 102 and the fine filter 101.

[0043] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the protection scope of the present invention.

Claims

1. A device for filtering and removing impurities from a liquid metal melt by means of positive and negative pressure double action bipolar filtration, characterized in that: The filter includes a filter housing (0), a wall panel (103) that divides the filter housing (0) into a first filter housing (1) and a second filter housing (2), a molten metal channel (4) located at the bottom of the wall panel (103) that connects the first filter housing (1) and the second filter housing (2), an inlet channel (101) that is independently connected to the first filter housing (1), and an outlet channel (201) that is independently connected to the second filter housing (2); a vacuum suction device (5) that creates a negative pressure on the first filter housing (1) and the second filter housing (2) is connected to the first filter housing (1) and the second filter housing (2) by a pipeline; a coarse filter device (102) for filtering molten metal is installed in the first filter housing (1), and a fine filter device (202) for filtering molten metal is installed in the second filter housing (2).

2. The device for filtering impurities from a liquid metal melt according to claim 1, characterized in that: The first filter box (1) is provided with an inlet (104) communicating with the inlet channel (101), and the second filter box (2) is provided with an outlet (204) communicating with the outlet channel (201); the inlet channel (101) is also provided with a channel inlet (105) corresponding to the inlet (104), and the outlet channel (201) is provided with a channel outlet (205) corresponding to the outlet (204).

3. The device for filtering impurities from liquid metal melt by double pressure and double action according to claim 1, characterized in that: It also includes a positive pressure device (6) capable of injecting inert gas into the first filter box (1) and / or the second filter box (2); the positive pressure device (6) includes a positive pressure injection pipe (601) that is connected to the first filter box (1) and the second filter box (2) respectively and injects inert gas into the first filter box (1) and the second filter box (2), a control valve (602) connected to the positive pressure injection pipe (601), and a gas source pipe connected to the control valve (602).

4. The device for filtering impurities from liquid metal melt by double pressure and double action according to claim 1, characterized in that: Both the inlet flow channel (101) and the outlet flow channel (201) are equipped with a sealing device (7) and a metal liquid level measuring device (8) for real-time monitoring of the molten metal level. The first filter box (1) and / or the second filter box (2) are also equipped with a metal liquid level measuring device (8).

5. The positive and negative pressure double-acting liquid metal melt bipolar filter impurity removal device according to claim 4, characterized in that: The sealing device (7) includes a connecting rod (701) installed on the first filter box (1) and the second filter box (2), a sealing block (702) installed on one end of the connecting rod (701), a drive source (703) connected to the other end of the connecting rod (701) to drive the connecting rod (701) to move, and a support rod (704) supporting the connecting rod (701).

6. The device for filtering impurities from a liquid metal melt according to claim 2, characterized in that: The bottom of the second filter box (2) is provided with a flow guide (203). The flow guide (203) causes the molten metal flowing in from the molten metal channel (4) to flow in the direction of vertical upward, horizontal side, vertical downward and horizontal side in sequence before flowing to the outlet (204).

7. The device for filtering impurities from a liquid metal melt according to claim 1, characterized in that: The first filter box (1) and the second filter box (2) are respectively equipped with flip-top lids (3); the lids (3) are equipped with high-temperature resistant sealing rings (301) and high-temperature fireproof grooves (302); the high-temperature fireproof grooves (302) are filled with rope-shaped high-temperature materials.

8. The positive and negative pressure double-acting liquid metal melt bipolar filter impurity removal device according to claim 7, characterized in that: The first filter box (1) and the second filter box (2) are each equipped with a flip guide seat (303) to facilitate the flipping of the box cover (3) and a second drive source (304) to drive the flipping of the box cover (3).

9. The device for filtering impurities from a liquid metal melt according to claim 2, characterized in that: It also includes a movable preheating device provided at the inlet (105) and / or outlet (205) of the flow channel for preheating the first filter box (1) and / or the second filter box (2).

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