A special ball valve for pulverized coal injection

Abstract

The present invention discloses a ball valve for coal powder injection, which belongs to the technical field of pipeline shut-off ball valves, and includes a ball valve body, the ball valve body consisting of a valve seat and a ball valve core, a through valve port provided in the ball valve core, an air blowing anti-wear component provided in the ball valve core, a control seat provided outside the valve seat, a swivel control end connected to the ball valve core provided at one end of the control seat, a pneumatic control component provided at the other end of the control seat, a spherical groove provided at the bottom of the butt joint, and an air induction member provided in the butt joint located at the spherical groove. The present invention provides a spherical groove for accumulating coal powder in the air inlet pipe of the ball valve, and provides an air induction plate above the spherical groove. During the closing process, the coal powder concentrated at the air inlet of the ball valve core is accumulated in the spherical groove. During the opening process, the air induction plate is used to change the wind direction so that the coal powder concentrated in the spherical groove is transported, thereby achieving the effect of increasing the amount of coal powder when the air pressure increases and achieving the effect of uniformly transporting the coal powder.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline shutoff ball valves, in particular to a special ball valve for coal powder injection. Background Art

[0002] The blast furnace pulverized coal injection technology uses low-cost non-coking coal to partially replace expensive metallurgical coke, which is beneficial to the intensified smelting and smooth furnace condition of the blast furnace. It can greatly improve the technical and economic indicators of the blast furnace, has significant economic benefits, and can also ease the demand for coke, reduce coke consumption, and reduce the pollution caused by coking production to the environment.

[0003] The pulverizing, feeding and injection systems for blast furnace pulverized coal injection are filled with various pipes and many valves. The reliability of the valves plays an important role in the blast furnace injection process. Therefore, it is very important to improve the sealing performance and extend the service life of the valves. Although the current ball valves can improve the wear resistance through material innovation, they cannot effectively solve the problem of wear caused by coal powder entering between the valve body and the valve core. In addition, the existing valve body is unstable in the process of closing and opening. During the closing process, the coal powder transported by the airflow is suddenly blocked, forming a vortex and accumulating at the valve core. When opening, the coal powder accumulated at the valve core cannot be supplied in time, so that the coal powder cannot be effectively supplied at the beginning of opening, and all the coal powder is supplied in a concentrated manner after opening. This has a serious impact on the uniformity of coal powder transportation in the conveying pipeline. For this reason, a special ball valve for coal powder injection is proposed. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems existing in the prior art ball valves in the coal powder injection pipeline, and to propose a special ball valve for coal powder injection.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A ball valve for pulverized coal injection, comprising a ball valve body, the ball valve body consisting of a valve seat and a ball valve inner core, a through valve port being provided in the ball valve inner core, an air blowing anti-wear component being provided in the ball valve inner core, a control seat being provided on the outside of the valve seat, a swivel control end being provided at one end of the control seat connected to the ball valve inner core, a pneumatic control component being provided at the other end of the control seat, butt joints being connected at both ends of the valve seat, pipe flanges being provided at the ends of the butt joints being connected to the pulverized coal conveying pipe, a spherical groove being provided at the bottom of the butt joint on one side, and an air inducing member being provided in the butt joint at the spherical groove;

[0007] The rotary shaft control end includes a manual control shaft provided on the control seat, and both ends of the ball valve inner core are provided with a rotary shaft connecting piece, and the manual control shaft is fixedly connected to the rotary shaft connecting piece on one side. The control seat is provided with an opening and closing motor, and the output end of the opening and closing motor is connected to the manual control shaft through a first gear transmission member;

[0008] The pneumatic control component includes a mounting port opened on the control seat, two pneumatic disks are arranged in the mounting port, a central connecting disk is arranged in the pneumatic disk, the central connecting disks are connected by a rotating shaft, the rotating shaft is connected to the output end of the opening and closing motor through a second gear transmission member, an extrusion piston member is provided on the outer wall of the central connecting disk, an air collecting ring is provided on the outer wall of the pneumatic disk, and the air collecting ring is connected to the blowing anti-wear component through an air supply pipe.

[0009] Preferably, the air inducing member includes a central shaft rotatably arranged on the inner side wall of the butt joint tube, and an air inducing plate is sleeved on the central shaft. The air inducing plate is circular and has an uneven wave shape as a whole.

[0010] Preferably, a spherical opening for installing the ball valve inner core is provided in the valve seat, the ball valve inner core is located in the spherical opening, and a sealing ring layer is provided on the side wall thereof.

[0011] Preferably, the air blowing anti-wear component includes an annular air channel opened in the inner core of the ball valve, and the inner wall of the through valve port is densely covered with air holes, and the air holes are connected to the annular air channel.

[0012] Preferably, adjacent gas collecting rings are connected through connecting pipes, one end of the gas supply pipe is connected to the gas collecting ring, and the other end is connected to the rotating shaft connector, and a through air channel connected to the annular air channel is opened in the rotating shaft connector located on one side of the gas supply pipe.

[0013] Preferably, the first gear transmission member and the second gear transmission member are both composed of a driving gear and a transmission gear, the driving gear is fixedly connected to the output shaft of the opening and closing motor, and the two transmission gears are distributed on the manual control shaft and the rotating shaft.

[0014] Preferably, an arc-shaped air pressure port is opened in the pneumatic disk, and the extrusion piston member includes a pneumatic piston arranged in the arc-shaped air pressure port, and the pneumatic piston is fixedly connected to the outer side wall of the central connecting disk through an L-shaped extrusion rod.

[0015] Preferably, a connecting pipe connected to the gas collecting ring is provided on the side wall of the arc-shaped air pressure port, and a one-way air valve pipe is provided on the inner wall of the arc-shaped air pressure port.

[0016] Preferably, the blowing holes are arranged obliquely on the inner wall of the valve port, and the blowing holes are divided into two groups and are relatively staggered.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. This solution is designed between the ball valve core and the valve seat, and utilizes the conversion of the transmission force of the opening and closing motor during the opening process, so that when the ball valve core is opened and closed, the extruded gas is delivered into the ball valve core, and the coal powder dust at the spherical mouth is blown in advance through the blowing holes set on the ball valve core, and the coal powder is blown away in advance, which effectively reduces the friction generated during the rotation process and improves the life of the ball valve.

[0019] 2. The present invention provides a spherical groove for accumulating coal powder in the air inlet duct of the ball valve, and provides an air induction plate above the spherical groove. During the closing process, the coal powder concentrated at the air inlet of the inner core of the ball valve is accumulated in the spherical groove. During the opening process, the air induction plate is used to change the wind direction so that the coal powder concentrated in the spherical groove is transported, thereby achieving the effect of increasing the amount of coal powder when the air pressure increases, and achieving the effect of uniform transportation of coal powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the three-dimensional structure of a ball valve for pulverized coal injection proposed by the present invention;

[0021] Figure 2 This is a schematic side cross-sectional view of a ball valve for pulverized coal injection proposed by the present invention;

[0022] Figure 3 This is a schematic diagram of the top view of a special ball valve for pulverized coal injection proposed by the present invention;

[0023] Figure 4 This is a horizontal cross-sectional view of a ball valve for pulverized coal injection proposed by the present invention;

[0024] Figure 5 This is a schematic diagram of the end face structure of a control seat in a ball valve dedicated to pulverized coal injection proposed by the present invention;

[0025] Figure 6 This is a schematic diagram showing the comparative structure of two pneumatic discs in a ball valve for pulverized coal injection proposed by the present invention;

[0026] Figure 7 This is a structural schematic diagram of an air induction plate in a special ball valve for coal powder injection proposed by the present invention.

[0027] In the figure: 1. Valve seat; 2. Ball valve inner core; 3. Through valve port; 4. Control seat; 5. Butt joint; 6. Pipe flange; 7. Spherical groove; 8. Manual control shaft; 9. Rotating shaft connector; 10. Opening and closing motor; 11. Pneumatic disk; 12. Center connecting disk; 13. Rotating shaft; 14. Gas collecting ring; 15. Gas pipe; 16. Center shaft; 17. Air induced draft plate; 18. Sealing ring layer; 19. Annular air duct; 20. Blowing hole; 21. Driving gear; 22. Transmission gear; 23. Pneumatic piston; 24. L-shaped extrusion rod; 25. Connecting pipe; 26. One-way air valve pipe. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] Example 1

[0030] Reference Figure 1-7 A ball valve specially used for pulverized coal injection includes a ball valve body, which is composed of a valve seat 1 and a ball valve core 2. Furthermore, a spherical opening for installing the ball valve core 2 is opened in the valve seat 1. The ball valve core 2 is located in the spherical opening, and a sealing ring layer 18 is provided on its side wall. The setting of the sealing ring layer 18 can improve the sealing performance after the ball valve core 2 is closed.

[0031] A through-valve port 3 is provided in the ball valve inner core 2, and an air blowing anti-wear component is provided in the ball valve inner core 2. Furthermore, the air blowing anti-wear component includes an annular air channel 19 opened in the ball valve inner core 2, and the inner wall of the through-valve port 3 is densely covered with air holes 20. The air holes 20 are connected to the annular air channel 19. The air holes 20 are obliquely arranged on the inner wall of the through-valve port 3. The air holes 20 are divided into two groups and are relatively staggered.

[0032] A further benefit of adopting the above method is that each time the ball valve inner core 2 is rotated, the coal powder dust at the spherical mouth can be blown away in advance, and the coal powder can be blown away in advance, effectively avoiding dust from entering the gap between the spherical mouth and the ball valve inner core 2, effectively reducing the friction generated during the rotation process, and improving the life of the ball valve.

[0033] A control seat 4 is provided on the outside of the valve seat 1. A swivel control end connected to the ball valve inner core 2 is provided at one end of the control seat 4. A pneumatic control component is provided at the other end of the control seat 4. Both ends of the valve seat 1 are connected to a butt joint 5. The ends of the butt joint 5 are provided with a pipe flange 6 connected to the coal powder conveying pipeline.

[0034] A spherical groove 7 is provided at the bottom of the butt joint tube 5 on one side. An air induction member is provided in the butt joint tube 5 at the spherical groove 7. Further, the air induction member includes a central shaft 16 rotatably provided on the inner side wall of the butt joint tube 5. An air induction plate 17 is sleeved on the central shaft 16. The air induction plate 17 is circular and has an uneven wave-like shape as a whole.

[0035] It should be noted that the spherical groove 7 is arranged at the butt joint pipe 5 on the air inlet side, and can only play a role at the butt joint pipe 5 on the air inlet side. The spherical groove 7 is arranged to collect the coal powder accumulated at the end of the butt joint pipe 5 when the ball valve is closed in the spherical groove 7. When the ball valve is opened, the air induced plate 17 can be used in time to replenish the coal powder into the ball valve for transportation, so as to achieve the effect of uniform transportation.

[0036] It is worth noting that the material of the air induced plate 17 in this solution is a lightweight plastic material. After the ball valve is opened, it is in a horizontal state under the action of wind, which reduces wind resistance and does not affect normal material transportation. When the valve is just opened, the wind force will be guided by the inclined air induced plate 17. The guided wind will be transported obliquely into the spherical groove 7, thereby achieving rapid transportation of the coal powder therein and supplementing the shortage of coal powder when the valve is just opened.

[0037] The rotary shaft control end includes a manual control shaft 8 provided on the control seat 4, and a rotary shaft connector 9 is provided at both ends of the ball valve inner core 2. The manual control shaft 8 is fixedly connected to the rotary shaft connector 9 on one side. A start-and-stop motor 10 is provided on the control seat 4, and the output end of the start-and-stop motor 10 is connected to the manual control shaft 8 through a first gear transmission member.

[0038] A further benefit of adopting the above method is that, by providing the manual control shaft 8 , the ball valve can be opened and closed by rotating the manual control shaft 8 in case of emergency use.

[0039] The pneumatic control assembly includes a mounting port on the control seat 4, in which two pneumatic discs 11 are provided. A central connecting disc 12 is provided inside the pneumatic disc 11. The central connecting discs 12 are connected by a rotating shaft 13. The rotating shaft 13 is connected to the output end of the opening and closing motor 10 through a second gear transmission member. An extrusion piston member is provided on the outer wall of the central connecting disc 12.

[0040] It should be noted that there are two pneumatic discs 11, and the structures inside the pneumatic discs 11 are arranged in opposite directions, so that when opening and closing the valve, two different pneumatic discs 11 can supply air, and the piston is used to compress the gas and transport it, which mostly clears the coal powder on the contact surface.

[0041] Furthermore, an arc-shaped air pressure port is opened in the pneumatic disc 11, and the extrusion piston member includes a pneumatic piston 23 arranged in the arc-shaped air pressure port. The pneumatic piston 23 is fixedly connected to the outer wall of the central connecting disc 12 through an L-shaped extrusion rod 24. A connecting pipe 25 connected to the air collecting ring 14 is provided on the side wall of the arc-shaped air pressure port, and a one-way air valve pipe 26 is provided on the inner wall of the arc-shaped air pressure port.

[0042] The extrusion piston is located in the arc-shaped air pressure port to achieve the effect of squeezing air and realize pressurized gas transmission.

[0043] The one-way valve pipe 26 can only achieve the effect of one-way air intake, and a one-way valve is also provided in the air supply pipe 15, which can only achieve the effect of one-way air supply;

[0044] An air collecting ring 14 is provided on the outer wall of the pneumatic disc 11, and the air collecting ring 14 is connected to the air blowing anti-wear component through an air pipe 15. The setting of the air collecting ring 14 can realize the collection of gas in multiple arc-shaped air pressure ports before delivery.

[0045] Furthermore, adjacent gas collecting rings 14 are connected through connecting pipes 25. One end of the gas delivery pipe 15 is connected to the gas collecting ring 14, and the other end is connected to the shaft connector 9. A through air channel connected to the annular air channel 19 is opened in the shaft connector 9 on one side of the gas delivery pipe 15.

[0046] Furthermore, the first gear transmission member and the second gear transmission member are both composed of a driving gear 21 and a transmission gear 22. The driving gear 21 is fixedly connected to the output shaft of the opening and closing motor 10, and the two transmission gears 22 are distributed on the manual control shaft 8 and the rotating shaft 13.

[0047] When the present invention is in use, when the ball valve inner core 2 is closed by the opening and closing motor 10, the output end of the opening and closing motor 10 rotates, which will drive the driving gear 21 connected thereto, and the transmission gear 22 meshing with the driving gear 21 will drive the manual control shaft 8 to rotate. The rotated manual control shaft 8 will drive the ball valve inner core 2 connected thereto via the rotating shaft connector 9 to rotate, thereby closing the ball valve. In this process, the center connecting plate 12 connected thereto via the rotating shaft 13 will rotate, and during the rotation process, the pneumatic piston 23 connected thereto via the L-shaped extrusion rod 24 will squeeze the air, thereby mostly compressing the gas and delivering it to the blowing hole 20 provided on the ball valve inner core 2. During the delivery, the coal powder between the valve seat 1 and the ball valve inner core 2 during the closing process will be effectively blown away, thereby avoiding dust from entering the gap between the spherical port and the ball valve inner core 2, effectively reducing the friction generated during the rotation process, and improving the service life of the ball valve.

[0048] When the ball valve is opened, the ball valve core 2 is rotated by controlling the opening and closing motor 10. During the rotation, the through valve port 3 that first contacts the ball valve core 2 will open from the spherical groove 7. At this time, the coal powder conveying pipe is connected, and the gas therein is conveyed. However, due to the presence of the air induced plate 17, the gas will be transported through the spherical groove 7 after the action of the air induced plate 17. This can increase the gas pressure passing through the not fully opened through valve port 3 during the opening process of the ball valve core 2. While the gas pressure increases, the accumulated coal powder stored in the spherical groove 7 will be used to supplement the coal powder amount of the high-pressure gas, thereby ensuring the uniform delivery of coal powder during the opening process.

[0049] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A ball valve for pulverized coal injection, comprising a ball valve body, characterized in that: The ball valve body is composed of a valve seat (1) and a ball valve inner core (2), a through valve port (3) is provided in the ball valve inner core (2), an air blowing anti-wear component is provided in the ball valve inner core (2), a control seat (4) is provided outside the valve seat (1), one end of the control seat (4) is provided with a rotary shaft control end connected to the ball valve inner core (2), and the other end of the control seat (4) is provided with a pneumatic control component, both ends of the valve seat (1) are connected to a butt joint pipe (5), and both ends of the butt joint pipe (5) are provided with a pipe flange (6) connected to a coal powder conveying pipe, a spherical groove (7) is provided at the bottom of the butt joint pipe (5) on one side, and an air induction member is provided in the butt joint pipe (5) located at the spherical groove (7); The rotary shaft control end includes a manual control shaft (8) provided on the control seat (4), and both ends of the ball valve inner core (2) are provided with a rotary shaft connecting member (9), and the manual control shaft (8) is fixedly connected to the rotary shaft connecting member (9) on one side. The control seat (4) is provided with an opening and closing motor (10), and the output end of the opening and closing motor (10) is connected to the manual control shaft (8) through a first gear transmission member; The pneumatic control assembly includes a mounting port opened on the control seat (4), two pneumatic discs (11) are arranged in the mounting port, a central connecting disc (12) is arranged in the pneumatic disc (11), the central connecting discs (12) are connected to each other through a rotating shaft (13), the rotating shaft (13) is connected to the output end of the opening and closing motor (10) through a second gear transmission member, an extrusion piston member is arranged on the outer wall of the central connecting disc (12), an air collecting ring (14) is arranged on the outer wall of the pneumatic disc (11), and the air collecting ring (14) is connected to the air blowing anti-wear assembly through an air supply pipe (15); The air induction member comprises a central shaft (16) rotatably arranged on the inner side wall of the butt joint tube (5); an air induction plate (17) is sleeved on the central shaft (16); the air induction plate (17) is circular and has an uneven wave shape as a whole; The air blowing anti-wear component comprises an annular air channel (19) provided in the inner core (2) of the ball valve, and the inner wall of the through valve port (3) is densely covered with air blowing holes (20), and the air blowing holes (20) are connected to the annular air channel (19).

2. A ball valve for pulverized coal injection according to claim 1, characterized in that: A spherical opening for installing the ball valve inner core (2) is provided in the valve seat (1). The ball valve inner core (2) is located in the spherical opening, and a sealing ring layer (18) is provided on the side wall thereof.

3. A ball valve for pulverized coal injection according to claim 1, characterized in that: Adjacent gas collecting rings (14) are connected via connecting pipes (25). One end of the gas delivery pipe (15) is connected to the gas collecting ring (14), and the other end is connected to the rotating shaft connector (9). A through air channel connected to the annular air channel (19) is provided in the rotating shaft connector (9) located on one side of the gas delivery pipe (15).

4. A ball valve for pulverized coal injection according to claim 1, characterized in that: The first gear transmission member and the second gear transmission member are both composed of a driving gear (21) and a transmission gear (22), wherein the driving gear (21) is fixedly connected to the output shaft of the opening and closing motor (10), and the two transmission gears (22) are distributed on the manual control shaft (8) and the rotating shaft (13).

5. A ball valve for pulverized coal injection according to claim 1, characterized in that: An arc-shaped air pressure port is provided in the pneumatic disk (11), and the extrusion piston member includes a pneumatic piston (23) arranged in the arc-shaped air pressure port. The pneumatic piston (23) is fixedly connected to the outer side wall of the central connecting disk (12) via an L-shaped extrusion rod (24).

6. A ball valve for pulverized coal injection according to claim 5, characterized in that: The side wall of the arc-shaped air pressure port is provided with a connecting pipe (25) connected to the air collecting ring (14), and the inner wall of the arc-shaped air pressure port is provided with a one-way air valve pipe (26).

7. A ball valve for pulverized coal injection according to claim 1, characterized in that: The blowing holes (20) are arranged obliquely on the inner wall of the through valve port (3), and the blowing holes (20) are divided into two groups and are arranged relatively staggered.

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