Acid and alkali resistant stop valve for metallurgical system

Abstract

The invention relates to the technical field of stop valves, in particular to an acid and alkali resistant stop valve for a metallurgical system, which is characterized in that a liquid inlet positioned on the left side and a liquid outlet positioned on the right side are respectively formed in an internal channel of a valve body, are oppositely distributed at the left lower part and the right upper part, and are separated by a valve clack; a fluid cavity is formed in the position, below the valve clack, in a channel of the valve body, a sealing base communicated with the interior of the valve body is fixedly arranged at the bottom end of the valve body, a partition plate is arranged in the sealing base, a rotational flow piece is installed on the partition plate, and the rotational flow piece is rotated to enable fluid in the fluid cavity to form vortexes. The bottom end of the sealing base is fixedly provided with a sealing cover, the sealing cover is internally provided with a precipitation bin tightly attached to the inclined face of the bottom end of the partition plate, the vast majority of metal particles fall into the precipitation bin, the metal particles can be prevented from corroding the inner wall of the valve, and the acid and alkali resistance of the valve is guaranteed; and meanwhile, the leakage phenomenon of the valve is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of stop valves, in particular to an acid- and alkali-resistant stop valve for a metallurgical system. Background Art

[0002] A large amount of heavy metal wastewater generated in the metallurgical system needs to be centrally treated before it can be discharged. This type of wastewater is also corrosive to a certain extent. Therefore, the valves used in the wastewater pipelines of the metallurgical system need to have good acid and alkali corrosion resistance. The stop valve is a widely used valve that can be used for fluid cutoff and flow regulation.

[0003] In a patent application with publication number CN115076408A, a high-strength corrosion-resistant copper valve is proposed. The copper shell, ceramic lining and ceramic valve core are provided. The copper shell is used as the valve body, and the ceramic lining and ceramic valve core are used as valve working parts. The corrosion resistance of the valve is effectively improved. The two combined shell bodies and two lining bodies are convenient for the installation of the ceramic lining and the ceramic valve core, the processing and assembly of the valve are convenient, and the structural strength is improved. This patent application mainly considers improving the corrosion resistance and installation convenience of the valve, but does not take into account that when the valve is installed in a metallurgical wastewater pipeline, the metal particles present in the wastewater will scour, accumulate and wear the sealing surface and fluid channel of the valve, which will accelerate the corrosion of the valve body after long-term use, further reduce the acid and alkali resistance of the valve and even cause the valve to leak, affecting the service life and use effect of the valve. Summary of the invention

[0004] 1. Technical issues to be resolved In view of the deficiencies in the prior art, the present invention provides an acid- and alkali-resistant stop valve for a metallurgical system, which solves the problem that the stop valve in the prior art cannot be installed on a wastewater pipe for use, and the metal particles in the wastewater scour, accumulate and wear the inner wall of the valve, thereby accelerating the corrosion of the valve and further reducing the acid and alkali resistance of the valve.

[0005] (II) Technical solution To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an acid-alkali resistant stop valve for a metallurgical system, comprising a stop valve consisting of a valve body, a sealing top seat located at the top of the valve body, a valve stem vertically penetrating the sealing top seat and the valve body, and a valve disc fixedly connected to the bottom of the valve stem, wherein the internal channel of the valve body is respectively provided with a liquid inlet located on the left side and a liquid outlet located on the right side, the liquid inlet and the liquid outlet are relatively distributed in the lower left and upper right directions, the channels of the two are separated by the valve disc, and a fluid cavity is formed in the channel of the valve body at a position below the valve disc; A sealing base communicating with the interior of the valve body is fixedly disposed at the bottom end of the valve body, a partition is disposed inside the sealing base, a swirl component is mounted on the partition, and a plurality of swirl blades are movably disposed on the outer circumferential surface of the swirl component for changing the flow pattern of the fluid in the fluid cavity; A sealing cover is fixedly installed on the bottom end of the sealing base, and a sedimentation bin is provided inside the sealing cover, which is tightly attached to the inclined surface of the bottom end of the partition. The sedimentation bin consists of a funnel-shaped upper part and a square tube-shaped lower part. The bottom end of the sedimentation bin extends to the outer bottom end of the sealing cover. A block is horizontally penetrated inside the square tube part of the sedimentation bin to separate the fluid inside the sedimentation bin up and down.

[0006] Preferably, the cross section of the sealing base is a cylindrical structure, the cross section of the partition is a truncated cone structure, a circular hole is provided at the center of the upper bottom surface of the partition, and a partial edge of the lower bottom surface is fixedly connected to the inner wall of the sealing base.

[0007] Preferably, an arc-shaped gap is provided between another edge of the lower bottom surface of the partition and the inner wall of the sealing base, and the funnel opening of the upper half of the sedimentation bin completely overlaps with the gap formed between the partition and the inner wall of the sealing base.

[0008] Preferably, a rotating shaft is arranged in the circular hole opened on the bottom surface of the partition, a rubber sealing gasket is arranged between the rotating shaft and the circular hole, the swirl component is fixedly connected to the rotating shaft through a shaft rod, and the swirl component is located in the fluid cavity.

[0009] Preferably, the other end of the rotating shaft extends to below the bottom of the partition, a protective shell is fixedly installed inside the sealing cover, a driving motor is arranged inside the protective shell, and the output shaft of the driving motor is connected to the bottom end of the rotating shaft by bolts.

[0010] Preferably, two back-to-back cylinders are installed inside the protective shell, and the output shafts of the two cylinders are movably extended to the outside of the protective shell and are fixedly connected to a push-pull rod, and the other ends of the two push-pull rods are respectively fixedly connected to blocks extending to the outside of the sedimentation bin.

[0011] Preferably, the two cylinders inside the protective shell are of the same size and the central axes of the output shafts are located on the same horizontal line, the left and right push-pull rods are both in the cavity of the sealing cover, the block is vertically arranged between the sedimentation bin, the outer surface of the block is wrapped with a sealing rubber layer and is sealed and movably connected to the side wall of the sedimentation bin.

[0012] Preferably, the two cylinders are connected in series via the same wire, and the drive motor is connected via another wire. The wires connecting the cylinders and the drive motor extend to the outside of the protective shell and the sealing cover and are connected to two external power supplies.

[0013] Preferably, the outer cylindrical surface of the swirl element is equidistantly provided with a plurality of mounting grooves having the same number as the swirl blades, and a mounting rod passes through the inside of one side edge of each swirl blade, with both ends of the mounting rod fixedly connected to the inner wall of the mounting groove, and the axial direction of the mounting rod is consistent with the axial direction of the swirl element.

[0014] Preferably, the thickness of the swirl blade is smaller than the thickness of the mounting groove, the other side edge of the swirl blade is close to the inner wall of the sealing base, and the maximum diameter of the circle formed by the plurality of swirl blades is smaller than the inner diameter of the sealing base.

[0015] (III) Beneficial effects Compared with the prior art, the present invention provides an acid- and alkali-resistant stop valve for a metallurgical system, which has the following beneficial effects: By arranging a swirl component in the sealing base at the bottom of the valve, when the drainage operation is performed, the swirl component is driven to rotate and several swirl blades on its outer cylindrical surface rotate simultaneously, so that the fluid in the fluid cavity forms a vortex, and the metal particles are continuously gathered to the center of the vortex, and most of the metal particles are further kept away from the inner wall of the valve, so as to avoid the metal particles adhering to the inner wall of the valve and accelerating corrosion, thereby ensuring the acid and alkali resistance of the valve itself; By setting a sedimentation bin in the sealing base at the bottom of the valve, when the drainage operation is not performed, most of the metal particles will sink to the bottom of the valve channel, and part of the metal in the fluid cavity will sink to the upper surface of the swirl component, and the other part will gradually fall along the inclined surface of the partition to the sedimentation bin below, so that most of the metal particles will not adhere to the inner wall of the valve, thereby preventing the metal particles from sticking to the inner wall of the valve and corroding the valve, preventing the valve from leaking, and extending the service life of the valve; By starting the cylinder to control the block to move back and forth rapidly in the horizontal direction, the movement of the block causes the sedimentation bin to open briefly. At this time, the metal particles accumulated above the block are quickly discharged downward, and then the sedimentation bin channel is immediately closed to reseal the valve, thereby achieving the effect of cleaning the metal particles accumulated inside the valve and preventing the inner wall of the valve from being corroded and affecting its acid and alkali resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings: Figure 1 This is an outline diagram of the stop valve body of the present invention; Figure 2 It is a front view of the stop valve of the present invention; Figure 3 This is a front view of the internal structure of the sealing base and sealing cover of the stop valve of the present invention; Figure 4 It is a cross-sectional view of the internal structure of the valve body of the present invention; Figure 5 It is a side view of the stop valve of the present invention; Figure 6 It is a schematic diagram of the structure inside the sealing base of the present invention; Figure 7 It is a sectional front view of the internal structure of the valve body of the stop valve of the present invention; Figure 8 This is a disassembled diagram of the swirl component structure located in the sealing base of the present invention; Fig. 9 A top view of a swirl element of the present invention; Fig.10 This is a disassembled view of the swirl component, the sealing base and the partition of the present invention.

[0017] Description of reference numerals: 1. Valve body; 11. Sealing top seat; 111. Valve stem; 112. Valve disc; 12. Liquid inlet; 13. Liquid outlet; 14. Fluid chamber; 2. Sealing base; 21. Partition; 22. Swirl element; 221. Swirl blade; 222. Mounting groove; 223. Mounting rod; 23. Protective shell; 3. Sealing cover; 31. Sedimentation bin; 32. Stopper; 33. Push-pull rod. DETAILED DESCRIPTION

[0018] The following will describe the implementation methods of the present application in detail with the help of accompanying drawings and examples, so that the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0019] Embodiment 1, as Figure 1-10 As shown, the present invention provides the following technical solutions: an acid-alkali resistant stop valve for a metallurgical system, comprising a stop valve consisting of a valve body 1, a sealing top seat 11 located at the top of the valve body 1, a valve stem 111 vertically penetrating the sealing top seat 11 and the valve body 1, and a valve disc 112 fixedly connected to the bottom end of the valve stem 111, wherein the internal channel of the valve body 1 is respectively provided with a liquid inlet 12 located on the left and a liquid outlet 13 located on the right, as shown in FIG. Figure 7 As shown, the liquid inlet 12 and the liquid outlet 13 are relatively distributed at the lower left and upper right, so that the incoming fluid flows in a low-in and high-out trajectory, and the two channels are separated by the valve disc 112. A fluid cavity 14 is formed in the channel of the valve body 1 below the valve disc 112. When the stop valve is installed in the wastewater pipeline of the metallurgical system, the left side of the valve body 1 is set as the fluid inlet, and the right side is set as the fluid outlet, that is, the fluid flows into the fluid cavity 14 along the liquid inlet 12 and then flows out from the liquid outlet 13. A rotating handle is provided at the top of the valve stem 111. By adjusting the rotating handle, the valve disc 112 can be lifted and pressed down to achieve the effect of connecting and closing the channel between the liquid inlet 12 and the liquid outlet 13; Furthermore, a sealing base 2 communicating with the interior of the valve body 1 is fixedly provided at the bottom end thereof, a partition 21 is provided inside the sealing base 2, a swirl member 22 is mounted on the partition 21, and a plurality of swirl blades 221 are movably provided on the outer circumferential surface of the swirl member 22 for changing the flow pattern of the fluid in the fluid chamber 14, such as Figure 8 and Fig. 9 As shown, the outer circumferential surface of the swirl member 22 is equidistantly provided with a plurality of mounting grooves 222 having the same number as the swirl blades 221. A mounting rod 223 is passed through the inner side edge of each swirl blade 221. Both ends of the mounting rod 223 are fixedly connected to the inner wall of the mounting groove 222. The axial direction of the mounting rod 223 is consistent with the axial direction of the swirl member 22. When the swirl member 22 and the plurality of swirl blades 221 on its outer circumferential surface rotate simultaneously, the fluid in the fluid cavity 14 forms a vortex, which continuously gathers the metal particles toward the vortex center, further keeping most of the metal particles away from the inner wall of the valve, avoiding the metal particles from adhering to the inner wall of the valve and accelerating corrosion, thereby ensuring the acid and alkali resistance of the valve itself. Among them, the thickness of the swirl blade 221 is smaller than the thickness of the mounting groove 222, and the edge of the other side of the swirl blade 221 is close to the inner wall of the sealing base 2. Therefore, during the rotation of the plurality of swirl blades 221, the fluid located at the inner wall of the sealing base 2 can be quickly driven to flow, thereby preventing a large number of metal particles from adhering to the inner wall of the sealing base 2. The maximum diameter of the circle formed by the plurality of swirl blades 221 is smaller than the inner diameter of the sealing base 2. When the swirl element 22 rotates, the plurality of swirl blades 221 arranged at its edge position rotate accordingly. When the rotation speed of the swirl element 22 is the maximum, the maximum diameter of the circle formed by the edges of the plurality of swirl blades 221 is still smaller than the inner diameter of the sealing base 2, which can avoid friction with the inner wall of the sealing base 2 and wear of the valve. Since the thickness of the swirl blade 221 is smaller than the thickness of the mounting groove 222, when the rotation speed is not used, such as the rotation speed at the moment after the rotation starts and before the rotation stops is different from the rotation speed in the middle of the rotation, the angle of the swirl blade 221 inside the mounting groove 222 is inconsistent, which can prevent the metal particles in the wastewater from adhering to 211 and the mounting groove 222 for a long time. Furthermore, a rotating shaft is arranged in the circular hole opened on the bottom surface of the partition 21, and a rubber sealing gasket is arranged between the rotating shaft and the circular hole. The swirl member 22 is fixedly connected to the rotating shaft through an axle rod, and the swirl member 22 is located in the fluid chamber 14. The other end of the rotating shaft extends to the bottom of the partition 21. A protective shell 23 is fixedly installed inside the sealing cover 3. A driving motor is arranged inside the protective shell 23. The output shaft of the driving motor is connected to the bottom end of the rotating shaft through bolts. The rotation of the swirl member 22 is driven by the driving motor. The lower part of the partition 21 is completely separated from the upper part thereof. Therefore, the waste water inside the fluid chamber 14 will not flow to the protective shell 23, thereby ensuring the airtightness of the valve.

[0020] Embodiment 2, as Figure 3-10As shown, a sealing cover 3 is fixedly installed at the bottom end of the sealing base 2, and a sedimentation bin 31 is arranged inside the sealing cover 3, which is close to the inclined surface of the bottom end of the partition 21. The sedimentation bin 31 consists of a funnel-shaped upper part and a square tube-shaped lower part. The bottom end of the sedimentation bin 31 extends to the outer bottom end of the sealing cover 3. A stopper 32 is horizontally penetrated inside the square tube part of the sedimentation bin 31, which is used to separate the fluid inside the sedimentation bin 31 from top to bottom. The cross section of the sealing base 2 is a cylindrical structure, and the cross section of the partition 21 is a truncated cone structure. A circular hole is opened at the center of the upper bottom surface of the partition 21, and a part of the edge of the lower bottom surface is fixedly connected to the inner wall of the sealing base 2. An arc-shaped gap is arranged between the edge of the other part of the lower bottom surface of the partition 21 and the inner wall of the sealing base 2. The funnel opening of the upper part of the sedimentation bin 31 completely overlaps with the gap formed between the partition 21 and the inner wall of the sealing base 2. The gap between the partition 21 and the sealing base 2 is much larger than the connecting part, which helps most of the metal particles sink into the sedimentation bin 31. When the fluid in the fluid chamber 14 is stationary, since the density of most metals in the wastewater is greater than the density of water, most of the metal particles will sink to the bottom of the valve channel. Figure 3 and Figure 7 It can be seen that part of the metal in the fluid cavity 14 sinks to the upper surface of the swirl member 22, and the other part sinks to the inclined surface of the partition 21 along the gap between the swirl member 22 and the sealing base 2. The metal particles gradually fall along the inclined surface of the partition 21 to the top funnel of the sedimentation bin 31 below, and the metal particles are finally accumulated above the stopper 32, so that most of the metal particles will not adhere to the inner wall of the valve, thereby preventing the metal particles from adhering to the inner wall of the valve and corroding the valve, preventing the valve from leaking, and extending the service life of the valve. Furthermore, two back-to-back cylinders are installed inside the protective shell 23. The output shafts of the two cylinders are movable through the outside of the protective shell 23 and are fixedly connected to a push-pull rod 33. The other ends of the two push-pull rods 33 are respectively fixedly connected to the block 32 extending to the outside of the sedimentation bin 31. The two cylinders inside the protective shell 23 are of the same size and the central axes of the output shafts are located on the same horizontal line. The left and right push-pull rods 33 are both in the cavity of the sealing cover 3. The block 32 is vertically arranged between the sedimentation bin 31. The outer surface of the block 32 is wrapped with a sealing rubber layer and is sealingly and movably connected to the side wall of the sedimentation bin 31. After the valve is closed for a certain period of time, the cylinder is started to control the block 32 to move back and forth in the horizontal direction. The block 32 moves back and forth quickly to open the sedimentation bin 31 for a short time, and the opening time is limited to 1 second. At this time, the metal particles accumulated on the top of the block 32 are quickly discharged downward, and then the channel of the sedimentation bin 31 is immediately closed to reseal the valve, thereby achieving the effect of cleaning the metal particles accumulated inside the valve, preventing the inner wall of the valve from being corroded and affecting its acid and alkali resistance. The metal particles discharged from the bottom of the sedimentation bin 31 and a part of the wastewater are collected through pipes or containers for subsequent treatment. Among them, the two cylinders are connected in series through the same wire, and the drive motor is connected through another wire. The wires connected to the cylinders and the drive motor are extended to the outside of the protective shell 23 and the sealing cover 3 and are externally connected to two power supplies. The opening and closing of the drive motor and the two cylinders can be controlled by opening and closing the two power supplies respectively, or timers can be installed on the two power supplies for automatic opening and closing, so that the control of the valve is more automated.

[0021] When the above embodiment is working, when wastewater is discharged, the valve flap 112 can be lifted by rotating the rotating handle arranged at the top of the valve flap 112. At this time, the channel between the liquid inlet 12 and the liquid outlet 13 is connected, and the wastewater can be discharged outward. At the same time, the driving motor located in the protective shell 23 is started. When the driving motor drives the swirl member 22 and the plurality of swirl blades 221 on the outer cylindrical surface to rotate simultaneously, the fluid in the fluid cavity 14 forms a vortex, and the metal particles are continuously gathered to the center of the vortex, and most of the metal particles are further kept away from the inner wall of the valve, so as to avoid the metal particles adhering to the inner wall of the valve and accelerating corrosion, thereby ensuring the acid and alkali resistance of the valve itself; When wastewater is not discharged, the fluid in the fluid chamber 14 is static. Since the density of most metals in the wastewater is greater than that of water, most of the metal particles will sink to the bottom of the valve channel. Part of the metal in the fluid chamber 14 sinks to the upper surface of the swirl member 22, and the other part sinks along the gap between the swirl member 22 and the sealing base 2 to the inclined surface of the partition 21. The metal particles gradually fall along the inclined surface of the partition 21 to the top funnel of the sedimentation bin 31 below, and the metal particles are finally accumulated above the stopper 32, so that most of the metal particles are trapped in the fluid chamber 14. Some metal particles will not adhere to the inner wall of the valve, thereby preventing the metal particles from sticking to and corroding the inner wall of the valve, and preventing the valve from leaking. By starting the cylinder to control the block 32 to move back and forth in the horizontal direction, the block 32 moves back and forth quickly to open the sedimentation bin 31 for a short time. At this time, the metal particles accumulated above the block 32 are quickly discharged downward, and then the channel of the sedimentation bin 31 is immediately closed to reseal the valve, thereby achieving the effect of cleaning the metal particles accumulated inside the valve and preventing the inner wall of the valve from being corroded and affecting its acid and alkali resistance.

[0022] 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. An acid- and alkali-resistant stop valve for a metallurgical system, comprising a valve body (1), a sealing top seat (11) located at the top of the valve body (1), a valve stem (111) vertically penetrating the sealing top seat (11) and the valve body (1), and a valve disc (112) fixedly connected to the bottom end of the valve stem (111), characterized in that: The internal channel of the valve body (1) is provided with a liquid inlet (12) located on the left side and a liquid outlet (13) located on the right side, respectively. The liquid inlet (12) and the liquid outlet (13) are relatively distributed at the lower left and the upper right, and the channels of the two are separated by a valve flap (112). A fluid cavity (14) is formed in the channel of the valve body (1) below the valve flap (112); A sealing base (2) communicating with the interior of the valve body (1) is fixedly disposed at the bottom end thereof, a partition (21) is disposed inside the sealing base (2), a swirl member (22) is mounted on the partition (21), and a plurality of swirl blades (221) are movably disposed on the outer circumferential surface of the swirl member (22) for changing the flow pattern of the fluid in the fluid chamber (14); A sealing cover (3) is fixedly mounted on the bottom end of the sealing base (2). A sedimentation bin (31) is provided inside the sealing cover (3) and is closely attached to the inclined surface of the bottom end of the partition (21). The sedimentation bin (31) consists of a funnel-shaped upper part and a square tube-shaped lower part. The bottom end of the sedimentation bin (31) extends to the bottom end of the outside of the sealing cover (3). A stopper (32) is horizontally penetrated inside the square tube part of the sedimentation bin (31) for separating the fluid inside the sedimentation bin (31) from top to bottom.

2. The acid- and alkali-resistant stop valve for a metallurgical system according to claim 1, characterized in that: The cross section of the sealing base (2) is a cylindrical structure, the cross section of the partition (21) is a truncated cone structure, a circular hole is provided at the center of the upper bottom surface of the partition (21), and a portion of the edge of the lower bottom surface is fixedly connected to the inner wall of the sealing base (2).

3. The acid- and alkali-resistant stop valve for a metallurgical system according to claim 1, characterized in that: An arc-shaped gap is provided between the edge of another portion of the lower bottom surface of the partition (21) and the inner wall of the sealing base (2), and the funnel opening of the upper half of the sedimentation bin (31) completely overlaps with the gap formed between the partition (21) and the inner wall of the sealing base (2).

4. The acid- and alkali-resistant stop valve for a metallurgical system according to claim 3, characterized in that: A rotating shaft is arranged in the circular hole opened in the bottom surface of the partition plate (21), a rubber sealing gasket is arranged between the rotating shaft and the circular hole, the swirl element (22) is fixedly connected to the rotating shaft via a shaft, and the swirl element (22) is located in the fluid chamber (14).

5. The acid- and alkali-resistant stop valve for a metallurgical system according to claim 4, characterized in that: The other end of the rotating shaft extends to below the bottom of the partition (21), and a protective shell (23) is fixedly installed inside the sealing cover (3). A driving motor is arranged inside the protective shell (23), and the output shaft of the driving motor is connected to the bottom end of the rotating shaft by bolts.

6. The acid- and alkali-resistant stop valve for a metallurgical system according to claim 5, characterized in that: Two cylinders arranged in back-to-back orientation are also installed inside the protective shell (23). The output shafts of the two cylinders are movably extended to the outside of the protective shell (23) and are fixedly connected to a push-pull rod (33). The other ends of the two push-pull rods (33) are respectively fixedly connected to a stopper (32) extending to the outside of the sedimentation bin (31).

7. The acid- and alkali-resistant stop valve for a metallurgical system according to claim 6, characterized in that: The two cylinders inside the protective shell (23) are of the same size and the central axes of the output shafts are located on the same horizontal line. The left and right push-pull rods (33) are both located in the cavity of the sealing cover (3). The stopper (32) is vertically arranged between the sedimentation bin (31). The outer surface of the stopper (32) is wrapped with a sealing rubber layer and is sealed and movably connected to the side wall of the sedimentation bin (31).

8. The acid- and alkali-resistant stop valve for a metallurgical system according to claim 6, characterized in that: The two cylinders are connected in series via the same wire, and the drive motor is connected via another wire. The wires connecting the cylinders and the drive motor extend to the outside of the protective shell (23) and the sealing cover (3) and are externally connected to two power supplies.

9. The acid- and alkali-resistant stop valve for a metallurgical system according to claim 1, characterized in that: The outer cylindrical surface of the swirl member (22) is provided with a plurality of mounting grooves (222) at equal intervals, the same number as the number of the swirl blades (221); a mounting rod (223) penetrates the interior of one side edge of each swirl blade (221); both ends of the mounting rod (223) are fixedly connected to the inner wall of the mounting groove (222); the axial direction of the mounting rod (223) is consistent with the axial direction of the swirl member (22).

10. The acid- and alkali-resistant stop valve for a metallurgical system according to claim 9, characterized in that: The thickness of the swirl blade (221) is smaller than the thickness of the mounting groove (222); the other side edge of the swirl blade (221) is close to the inner wall of the sealing base (2); and the maximum diameter of the circle formed by the plurality of swirl blades (221) is smaller than the inner diameter of the sealing base (2).

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