Tubular microporous filter for vanadium-nitrogen alloy production

Abstract

The invention belongs to the technical field of tubular microporous filtration, and discloses a tubular microporous filter for vanadium-nitrogen alloy production, which comprises a filter shell, a push rod motor is mounted in the filter shell, an electric push rod is mounted on the push rod motor, and a sliding piston disc is fixedly connected to the electric push rod. According to the invention, through the cooperation of structures such as a push rod motor and a circular ring scraper blade, the push rod motor drives an electric push rod and the sliding piston disc to slide up and down, so that the filter can be used for filtering the filter; and meanwhile, the annular scraping plate and the connecting sliding rod are driven to slide up and down, so that the annular scraping plate scrapes solid impurities attached to the inner wall of the filtering pipeline.

Description

Technical Field

[0001] The invention belongs to the technical field of tubular microporous filtration, in particular to a tubular microporous filter for producing vanadium-nitrogen alloy. Background Art

[0002] Vanadium-nitrogen alloy is an alloy material composed of vanadium and nitrogen, which is mainly used to improve the performance of steel and other metal materials. The production process of vanadium-nitrogen alloy is to place vanadium source and ammonia source in a high-temperature furnace, heat them to between 700℃ and 1300℃, and react them in a nitrogen atmosphere or an ammonia atmosphere. Vanadium reacts with nitrogen to form vanadium-nitrogen compounds and forms a solid solution with the base metal. After the reaction is completed, the alloy is quickly cooled and crushed to remove impurities. The alloy is heated to a molten state again and the solid impurities generated in the production process are removed through a tubular microporous filter.

[0003] The existing tubular microporous filter filters impurities through a microporous filter mesh. After long-term use, solid impurities will accumulate on the microporous filter mesh, reducing the filtration efficiency of the microporous filter mesh. At the same time, solid impurities will also adhere to the inner wall of the filter pipe, requiring the filter pipe to be removed for cleaning, delaying production. Summary of the invention

[0004] In order to solve the problems raised in the above background technology that impurities will adhere to the inner wall of the filter pipe of the existing tubular microporous filter, which needs to be disassembled for cleaning at certain times, delaying production, and impurities will also accumulate on the microporous filter screen, reducing the filtration efficiency, the present invention provides a tubular microporous filter for vanadium-nitrogen alloy production.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a tubular microporous filter for the production of vanadium-nitrogen alloy, comprising a filter housing, a push rod motor is installed in the filter housing, an electric push rod is installed on the push rod motor, a sliding piston disc is fixedly connected to the electric push rod, a circumferential array of connecting sliding rods is fixedly connected to the sliding piston disc, an upper isolation plate is fixedly connected in the filter housing, a circumferential array of filter pipes is fixedly connected in the upper isolation plate, an annular scraper is slidably connected in the filter pipe, a sliding microporous filter screen is fixedly connected in the annular scraper, and the lower end of the sliding microporous filter screen is fixedly connected to the connecting sliding rod.

[0006] Preferably, a lower isolation plate is fixedly connected inside the filter housing, the upper isolation plate and the lower isolation plate are in contact with the inner wall of the filter housing, the lower isolation plate is fixedly connected through the lower end of the filter pipe, a filter tube cover is fixedly connected inside the upper end of the filter pipe, and a movable limiting piston is slidably connected through the filter tube cover.

[0007] Preferably, the outer diameter of the annular scraper is the same as the inner diameter of the filter pipe, a fixed microporous filter is fixedly connected to the lower end of the filter pipe, the fixed microporous filter is slidably connected to the connecting sliding rod, and a limited extrusion block is fixedly connected to the sliding microporous filter.

[0008] Preferably, a connecting piston tube is fixedly connected in the filter housing, a piston cavity is fixedly connected in the connecting piston tube, a sliding extrusion piston is slidably connected through the piston cavity, and a sliding piston rod is slidably connected through the connecting piston tube.

[0009] Preferably, the sliding piston rod is fixedly connected to the sliding piston disc, the lower end of the sliding extrusion piston is fixedly connected with an extrusion connecting ring, and a limiting spring is arranged between the extrusion connecting ring and the movable limiting piston.

[0010] Preferably, when the sliding piston rod is connected to the lowermost end of the piston tube, the pressure exerted on the sliding extrusion piston by the air pressure in the connecting piston tube and the piston chamber is greater than the elastic force of the limit spring, and the thrust of the push rod motor is greater than the sum of the elastic force of the limit spring and the pressure exerted on the sliding extrusion piston by the maximum air pressure in the connecting piston tube.

[0011] Preferably, a liquid inlet is fixedly connected to the upper end of the filter housing, a first liquid discharge port is fixedly connected to the outer contour of the filter housing, and a second liquid discharge port is fixedly connected to the outer contour of the filter housing at the lower side of the first liquid discharge port.

[0012] Preferably, through holes are respectively provided on the filter housing corresponding to the liquid inlet, the first liquid discharge port and the second liquid discharge port, and the lowest point of the through hole on the filter housing corresponding to the first liquid discharge port corresponds to the upper isolation plate.

[0013] Preferably, a first drainage baffle is fixedly connected to the through hole of the filter housing corresponding to the first drainage port, a first sliding piston column is slidably connected through the first drainage baffle, a first limiting tension spring is sleeved on the first sliding piston column, the first limiting tension spring is connected to the first drainage baffle, and a first extrusion wedge column is fixedly connected to the end of the first sliding piston column close to the filter housing, and the first extrusion wedge column is extrusion-matched with an extrusion connecting ring.

[0014] Preferably, a second drainage baffle is fixedly connected to the through hole corresponding to the second drainage port on the filter housing, a second sliding piston column is slidably connected through the second drainage baffle, a second limiting tension spring is wound around the second sliding piston column, the second limiting tension spring is connected to the second drainage baffle, a second extrusion wedge column is fixedly connected to the end of the second sliding piston column close to the filter housing, and the second extrusion wedge column is extruded and matched with the sliding piston disc.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention cooperates with structures such as a push rod motor and an annular scraper, and drives the electric push rod and the sliding piston disc to slide up and down through the push rod motor, and drives the annular scraper and the connecting sliding rod to slide up and down at the same time, so that the annular scraper scrapes off the solid impurities attached to the inner wall of the filter pipe, and at the same time, the solid impurities are pressed by the extrusion of the annular scraper and the fixed microporous filter screen, and the annular scraper is pressed by the extrusion of the filter pipe cover and the movable limiting piston, and at the same time, the amount of liquid entering the filter pipe is controlled by cooperating with the extrusion of the movable limiting piston, so as to filter the impurities while avoiding the impurities from adhering to the inner wall of the filter pipe;

[0017] The present invention cooperates with structures such as a sliding piston disc and an extrusion connecting ring, and the sliding piston disc slides up and down, thereby driving the sliding piston rod to slide synchronously, so that when the circular scraper moves up, the air pressure in the connecting piston tube and the piston cavity increases, so that the pressure of the extrusion connecting ring on the movable limit piston increases, ensuring that the solid impurities in the circular scraper are pressed tightly;

[0018] The present invention cooperates with structures such as an extrusion connecting ring and a first extrusion wedge column. When the impurities between the circular scraper, the filter tube cover and the movable limiting piston reach a certain amount, the circular scraper squeezes the movable limiting piston to slide upward through the compressed impurities, and then squeezes the extrusion connecting ring and the sliding extrusion piston to slide upward, so that the extrusion connecting ring and the first extrusion wedge column are squeezed, so that the liquid entering the liquid inlet is discharged from the first liquid discharge port, and at the same time, the gap between the filter tube cover and the movable limiting piston is blocked by solid impurities. Then, the operator only needs to remove the compacted impurities to continue filtering, avoiding cleaning of the filter pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention;

[0020] Figure 2 It is a half-section schematic diagram of the structure of the present invention;

[0021] Figure 3 A half-section schematic diagram of the filtration pipeline of the present invention;

[0022] Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle;

[0023] Figure 5 A half-section schematic diagram of a circular scraper of the present invention;

[0024] Figure 6 For the present invention Figure 3 Enlarged view of point B in the middle;

[0025] Figure 7This is a half-section schematic diagram of the first liquid discharge baffle of the present invention;

[0026] Figure 8 It is a half-section schematic diagram of the second liquid discharge baffle of the present invention.

[0027] In the figure: 100, filter housing; 101, liquid inlet; 102, first liquid outlet; 103, second liquid outlet; 200, push rod motor; 201, electric push rod; 202, sliding piston disc; 300, upper isolation plate; 301, lower isolation plate; 302, filter pipe; 303, filter pipe cover; 304, movable limit piston; 305, limit spring; 306, circular scraper; 307, connecting sliding rod; 308, sliding microporous filter; 309 , a limiting extrusion block; 310, a fixed microporous filter; 400, a connecting piston tube; 401, a piston chamber; 402, a sliding extrusion piston; 403, an extrusion connecting ring; 404, a sliding piston rod; 500, a first liquid discharge baffle; 501, a first sliding piston column; 502, a first extrusion wedge column; 503, a first limiting tension spring; 504, a second liquid discharge baffle; 505, a second sliding piston column; 506, a second limiting tension spring; 507, a second extrusion wedge column. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] like Figures 1 to 8 As shown, the present invention provides a tubular microporous filter for the production of vanadium-nitrogen alloy, comprising a filter housing 100, a push rod motor 200 is installed in the filter housing 100, an electric push rod 201 is installed on the push rod motor 200, a sliding piston disc 202 is fixedly connected to the electric push rod 201, a circumferential array of connecting sliding rods 307 are fixedly connected to the sliding piston disc 202, an upper isolation plate 300 is fixedly connected to the filter housing 100, a circumferential array of filter pipes 302 are fixedly connected to the upper isolation plate 300, a circular scraper 306 is slidably connected to the filter pipe 302, a sliding microporous filter screen 308 is fixedly connected to the circular scraper 306, and the lower end of the sliding microporous filter screen 308 is fixedly connected to the connecting sliding rod 307.

[0030] A lower isolation plate 301 is fixedly connected inside the filter housing 100, the upper isolation plate 300 and the lower isolation plate 301 are in contact with the inner wall of the filter housing 100, the lower isolation plate 301 is fixedly connected to the lower end of the filter pipe 302, a filter pipe cover 303 is fixedly connected to the upper end of the filter pipe 302, and a movable limiting piston 304 is slidably connected to the filter pipe cover 303.

[0031] The outer diameter of the annular scraper 306 is the same as the inner diameter of the filter pipe 302. A fixed microporous filter 310 is fixedly connected to the lower end of the filter pipe 302. The fixed microporous filter 310 is slidably connected to the connecting sliding rod 307. A limited extrusion block 309 is fixedly connected to the sliding microporous filter 308.

[0032] The above scheme is adopted: the push rod motor 200 drives the electric push rod 201 and the sliding piston disc 202 to slide upward, thereby driving the circular scraper 306, the connecting sliding rod 307 and the sliding microporous filter 308 to slide upward synchronously until the circular scraper 306 contacts the filter tube cover 303, and then the limit extrusion block 309 squeezes the movable limit piston 304 to slide upward, so that the piston state of the movable limit piston 304 and the filter tube cover 303 is unlocked, so that the liquid containing impurities in the vanadium nitrogen alloy production process passes through the movable limit piston 304 and The liquid flows through the gap of the filter tube cover 303 into the filter pipe 302, and then the impurities in the liquid are filtered for the first time through the sliding microporous filter mesh 308. At the same time, as the push rod motor 200 drives the annular scraper 306 to slide up and down, the solid impurities attached to the inner wall of the filter pipe 302 are scraped off. At the same time, the scraped solid impurities are compressed by the squeezing of the annular scraper 306, the filter tube cover 303 and the movable limit piston 304. Similarly, during the sliding process of the annular scraper 306, the impurities are compressed against the fixed microporous filter mesh 310.

[0033] When there are many solid impurities being compressed, the solid impurities are compressed away from the axis of the movable limiting piston 304 and the limiting squeezing block 309 through the limiting squeezing block 309 in cooperation with the annular scraper 306 and the movable limiting piston 304, so as to avoid the impurities accumulating on the lower side of the movable limiting piston 304 after being compressed, thereby increasing the amount of liquid entering the filter pipe 302.

[0034] like Figure 3 , Figure 4 and Figure 6 As shown, a connecting piston tube 400 is fixedly connected in the filter housing 100, a piston chamber 401 is fixedly connected in the connecting piston tube 400, a sliding extrusion piston 402 is slidably connected through the piston chamber 401, and a sliding piston rod 404 is slidably connected through the connecting piston tube 400.

[0035] The sliding piston rod 404 is fixedly connected to the sliding piston disc 202 . The lower end of the sliding extrusion piston 402 is fixedly connected with an extrusion connection ring 403 . A limit spring 305 is arranged between the extrusion connection ring 403 and the movable limit piston 304 .

[0036] When the sliding piston rod 404 is connected to the lower end of the piston tube 400, the pressure exerted on the sliding extrusion piston 402 by the air pressure connecting the piston tube 400 and the piston chamber 401 is greater than the elastic force of the limit spring 305, and the thrust of the push rod motor 200 is greater than the sum of the elastic force of the limit spring 305 and the pressure exerted on the sliding extrusion piston 402 by the maximum air pressure in the connecting piston tube 400.

[0037] The above scheme is adopted: by sliding the sliding piston disc 202 up and down, the sliding piston rod 404 is driven to slide up and down, thereby squeezing the gas in the connecting piston tube 400 and the piston chamber 401, so that the annular scraper 306 slides up to the filter tube cover 303 and the movable limiting piston 304 to squeeze the solid impurities, and cooperates with the air pressure in the connecting piston tube 400 and the piston chamber 401 to squeeze the sliding squeezing piston 402 and the squeezing connecting ring 403, and then squeezes the movable limiting piston 304 through the limiting spring 305, further compacting the solid impurities, and at the same time, squeezes the movable limiting piston 304 through the limiting squeezing block 309, so that the liquid containing impurities enters the filter pipe 302 again.

[0038] At the same time, when the solid impurities increase, the movable limiting piston 304 and the limiting spring 305 cooperate with the sliding extrusion piston 402 and the extrusion connecting ring 403 to increase the compaction degree of the solid impurities.

[0039] like Figures 1 to 3 and Figures 7 and 8 As shown, a liquid inlet 101 is fixedly connected to the upper end of the filter housing 100 , a first liquid discharge port 102 is fixedly connected to the outer contour of the filter housing 100 , and a second liquid discharge port 103 is fixedly connected to the outer contour of the filter housing 100 at the lower side of the first liquid discharge port 102 .

[0040] Through holes are respectively formed on the filter housing 100 corresponding to the liquid inlet 101 , the first liquid discharge port 102 and the second liquid discharge port 103 . The lowest point of the through hole on the filter housing 100 corresponding to the first liquid discharge port 102 corresponds to the upper isolation plate 300 .

[0041] A first drainage baffle 500 is fixedly connected in the through hole of the filter housing 100 corresponding to the first drainage port 102, and a first sliding piston column 501 is slidably connected through the first drainage baffle 500. A first limiting tension spring 503 is sleeved on the first sliding piston column 501, and the first limiting tension spring 503 is connected to the first drainage baffle 500. A first extrusion wedge column 502 is fixedly connected to one end of the first sliding piston column 501 close to the filter housing 100, and the first extrusion wedge column 502 is extruded and matched with the extrusion connecting ring 403.

[0042] A second drainage baffle 504 is fixedly connected to the through hole corresponding to the second drainage port 103 on the filter housing 100, and a second sliding piston column 505 is slidably connected to the second drainage baffle 504. A second limiting tension spring 506 is wound around the second sliding piston column 505, and the second limiting tension spring 506 is connected to the second drainage baffle 504. A second extrusion wedge column 507 is fixedly connected to the end of the second sliding piston column 505 close to the filter housing 100, and the second extrusion wedge column 507 is extruded and matched with the sliding piston disc 202.

[0043] The above scheme is adopted: the liquid containing solid impurities in the vanadium nitrogen alloy production process enters the filter housing 100 through the liquid inlet 101 for filtration. After the liquid is filtered, the push rod motor 200 drives the sliding piston disc 202 to slide downward, and then the sliding piston disc 202 squeezes the second squeezing wedge column 507, thereby unlocking the sealing state of the second sliding piston column 505 and the second liquid discharge baffle 504, so that the filtered liquid is discharged through the second liquid discharge port 103. When the solid impurities between the annular scraper 306, the filter tube cover 303 and the movable limit piston 304 are pressed tightly, the solid impurities between the annular scraper 306, the filter tube cover 303 and the movable limit piston 304 are pressed tightly. When it reaches a certain extent, the gap between the filter tube cover 303 and the movable limiting piston 304 is blocked by solid impurities, and at the same time, the movable limiting piston 304 squeezes the extrusion connecting ring 403 and the sliding extrusion piston 402 through the limiting spring 305, which causes the extrusion connecting ring 403 to squeeze the first extrusion wedge column 502, so that the sealing state of the first liquid discharge baffle 500 and the first limiting tension spring 503 is unlocked, so that the liquid containing impurities entering the filter housing 100 from the liquid inlet 101 is discharged from the first liquid discharge port 102, avoiding blockage of the filter pipe 302.

[0044] The working principle and use process of the present invention:

[0045] First, the operator injects a certain amount of liquid containing solid impurities in the production process of vanadium-nitrogen alloy into the filter housing 100 through the liquid inlet 101, and then starts the push rod motor 200 to drive the electric push rod 201 and the sliding piston disc 202 to slide upward. When the circular scraper 306 is squeezed by the filter tube cover 303 and the movable limit piston 304, the sliding is stopped, and the movable limit piston 304 is squeezed by the limit squeeze block 309 and the movable limit piston 304 to slide upward. The liquid containing impurities flows into the filter pipe 302 through the gap between the filter tube cover 303 and the movable limit piston 304, and first passes through the sliding microporous filter 308 to filter the liquid for the first time. Then, the liquid after the first filtration flows to the fixed microporous filter 310, and is filtered for the second time by the fixed microporous filter 310. When it enters the filter housing 1 00 is completely filtered, the push rod motor 200 drives the annular scraper 306 and the sliding microporous filter 308 to slide downward until the annular scraper 306 and the fixed microporous filter 310 are squeezed together, and at the same time, the sliding piston disc 202 is squeezed together with the second squeezing wedge column 507, so that the second squeezing wedge column 507 and the second sliding piston column 505 slide toward the second liquid discharge port 103, so that the sealing state between the second sliding piston column 505 and the second liquid discharge baffle 504 is unlocked, and the filtered liquid flows into the second liquid discharge port 103 through the gap between the second liquid discharge baffle 504 and the second sliding piston column 505, and then the push rod motor 200 drives the electric push rod 201 and the sliding piston disc 202 to slide upward, and the second limit tension spring 506 drives the second sliding piston column 505 and the second squeezing wedge column 507 to reset.

[0046] When the push rod motor 200 drives the annular scraper 306 to slide upward again, the annular scraper 306 scrapes the solid impurities attached to the inner wall of the filter pipe 302 into between the annular scraper 306 and the sliding microporous filter 308 until the annular scraper 306 is squeezed again with the filter tube cover 303 and the movable limit piston 304, and while opening the gap between the filter tube cover 303 and the movable limit piston 304, the solid impurities between the annular scraper 306 and the sliding microporous filter 308 are compressed. Similarly, when the annular scraper 306 slides downward, the impurities attached to the inner wall of the filter pipe 302 are scraped off until they fit the fixed microporous filter 310, thereby compressing the impurities.

[0047] At the same time, as the sliding piston disc 202 slides up and down, the sliding piston rod 404 is driven to slide synchronously, and then the sliding piston rod 404 squeezes the gas in the piston chamber 401 and the connecting piston tube 400, thereby increasing the air pressure on the sliding squeezing piston 402, so that when the circular scraper 306 slides up and the movable limit piston 304 presses the impurities, the sliding distance of the movable limit piston 304 is limited. When the solid impurities in the circular scraper 306 are pressurized to a certain amount, the circular scraper 306 slides up to press the impurities, squeezing the movable limit piston 304 to slide upward. Then, the extrusion connecting ring 403 and the sliding extrusion piston 402 slide upward, so that the extrusion connecting ring 403 and the sliding extrusion piston 402 are squeezed together, so that the sealing state between the first sliding piston column 501 and the first liquid drainage baffle 500 is released, so that the liquid containing impurities on the upper isolation plate 300 is discharged through the first liquid drainage port 102, and at the same time, the solid impurities compressed between the annular scraper 306 and the filter tube cover 303 and the movable limiting piston 304 are blocked in the gap between the filter tube cover 303 and the movable limiting piston 304, preventing the liquid from flowing into the filter pipe 302.

[0048] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A tubular microporous filter for vanadium nitrogen alloy production, comprising a filter housing (100), characterized in that: A push rod motor (200) is installed in the filter housing (100), an electric push rod (201) is installed on the push rod motor (200), a sliding piston disc (202) is fixedly connected to the electric push rod (201), a circumferential array of connecting sliding rods (307) are fixedly connected to the sliding piston disc (202), an upper isolation plate (300) is fixedly connected to the filter housing (100), a circumferential array of filter pipes (302) are fixedly connected to the upper isolation plate (300), a circular scraper (306) is slidably connected to the filter pipe (302), a sliding microporous filter screen (308) is fixedly connected to the circular scraper (306), and the lower end of the sliding microporous filter screen (308) is fixedly connected to the connecting sliding rod (307).

2. The tubular microporous filter for vanadium nitrogen alloy production according to claim 1, characterized in that: A lower isolation plate (301) is fixedly connected inside the filter housing (100); the upper isolation plate (300) and the lower isolation plate (301) are in contact with the inner wall of the filter housing (100); the lower isolation plate (301) is fixedly connected to the lower end of the filter pipe (302); a filter pipe cover (303) is fixedly connected inside the upper end of the filter pipe (302); and a movable limit piston (304) is slidably connected to the filter pipe cover (303).

3. The tubular microporous filter for vanadium nitrogen alloy production according to claim 1, characterized in that: The outer diameter of the annular scraper (306) is the same as the inner diameter of the filter pipe (302); a fixed microporous filter (310) is fixedly connected to the lower end of the filter pipe (302); the fixed microporous filter (310) is slidably connected to the connecting sliding rod (307); and a limited extrusion block (309) is fixedly connected to the sliding microporous filter (308).

4. The tubular microporous filter for vanadium nitrogen alloy production according to claim 1, characterized in that: A connecting piston tube (400) is fixedly connected inside the filter housing (100), a piston chamber (401) is fixedly connected to the connecting piston tube (400), a sliding extrusion piston (402) is slidably connected through the piston chamber (401), and a sliding piston rod (404) is slidably connected through the connecting piston tube (400).

5. The tubular microporous filter for producing vanadium-nitrogen alloy according to claim 4, characterized in that: The sliding piston rod (404) is fixedly connected to the sliding piston disc (202), the lower end of the sliding extrusion piston (402) is fixedly connected to an extrusion connection ring (403), and a limit spring (305) is provided between the extrusion connection ring (403) and the movable limit piston (304).

6. The tubular microporous filter for producing vanadium-nitrogen alloy according to claim 5, characterized in that: When the sliding piston rod (404) is connected to the lower end of the piston tube (400), the pressure exerted on the sliding extrusion piston (402) by the air pressure in the connecting piston tube (400) and the piston chamber (401) is greater than the elastic force of the limit spring (305), and the thrust of the push rod motor (200) is greater than the sum of the elastic force of the limit spring (305) and the pressure exerted on the sliding extrusion piston (402) by the maximum air pressure in the connecting piston tube (400).

7. The tubular microporous filter for producing vanadium-nitrogen alloy according to claim 1, characterized in that: The upper end of the filter housing (100) is fixedly connected to a liquid inlet (101), the outer contour of the filter housing (100) is fixedly connected to a first liquid discharge port (102), and the outer contour of the filter housing (100) is fixedly connected to a second liquid discharge port (103) at the lower side of the first liquid discharge port (102).

8. The tubular microporous filter for producing vanadium-nitrogen alloy according to claim 7, characterized in that: The filter housing (100) is provided with through holes corresponding to the liquid inlet (101), the first liquid discharge port (102) and the second liquid discharge port (103), respectively, and the lowest point of the through hole corresponding to the first liquid discharge port (102) on the filter housing (100) corresponds to the upper isolation plate (300).

9. The tubular microporous filter for producing vanadium-nitrogen alloy according to claim 8, characterized in that: A first liquid discharge baffle (500) is fixedly connected in the through hole of the filter housing (100) corresponding to the first liquid discharge port (102); a first sliding piston column (501) is slidably connected through the first liquid discharge baffle (500); a first limit tension spring (503) is sleeved on the first sliding piston column (501); the first limit tension spring (503) is connected to the first liquid discharge baffle (500); a first extrusion wedge column (502) is fixedly connected to one end of the first sliding piston column (501) close to the filter housing (100); the first extrusion wedge column (502) is extruded and matched with the extrusion connection ring (403).

10. The tubular microporous filter for producing vanadium-nitrogen alloy according to claim 9, characterized in that: A second liquid discharge baffle (504) is fixedly connected in the through hole corresponding to the second liquid discharge port (103) on the filter housing (100); a second sliding piston column (505) is slidably connected through the second liquid discharge baffle (504); a second limit tension spring (506) is wound around the second sliding piston column (505); the second limit tension spring (506) is connected to the second liquid discharge baffle (504); a second extrusion wedge column (507) is fixedly connected to one end of the second sliding piston column (505) close to the filter housing (100); the second extrusion wedge column (507) is extruded and matched with the sliding piston disc (202).

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