A cold air release valve with anti-blocking function

Abstract

The present application relates to the technical fields of blast furnace iron-making, in particular to a cold air blast valve with anti-blocking function, comprising a butterfly valve shell and a valve plate arranged in the butterfly valve shell; the top of the butterfly valve shell is connected with an outer cylinder and a diffusion cylinder, and the diffusion cylinder is arranged in the outer cylinder; a diffusion port is arranged on the lower cylinder wall of the diffusion cylinder; a piston is arranged in the diffusion cylinder; the piston opens or closes the diffusion port through up-down reciprocating movement; the piston is a cylinder structure with up-down through holes, and a support plate is fixed on the inner wall of the piston; the support plate is connected with the valve plate through a connecting rod mechanism, and a through hole is arranged on the support plate; the top of the diffusion cylinder is closed through a blind flange; in the present application, the up-down pressure of the piston is approximately the same when the piston moves up and down, and only the friction force with the inner wall of the diffusion cylinder is borne, without the action of the positive pressure of the gas, so that the force borne by the piston is smaller; on the one hand, the piston is less likely to be blocked; on the other hand, the power of the driving device of the cold air blast valve can be smaller.

Description

Technical Field

[0001] This invention relates to the field of blast furnace ironmaking technology, specifically to a cold air release valve with anti-blocking function. Background Technology

[0002] Blast furnace ironmaking requires a large amount of high-pressure cold air to be heated by a hot blast stove before being blown into the blast furnace. The volume and pressure of the cold air directly affect the blast furnace output and also have a significant impact on the safe operation of the blast furnace. Generally, a cold air venting valve is installed on the main cold air pipeline. During normal production, the cold air valve is in the air supply state, and the venting function is closed. When an emergency occurs in the blast furnace and the air supply channel needs to be reduced, the venting function of the cold air venting valve is opened in time, and the air supply channel is closed to release the cold air, thereby reducing the amount of air entering the blast furnace and reducing the pressure inside the furnace.

[0003] Currently used cold air venting valves have the problem of easy blockage in the venting channel, which poses a hidden danger of not being able to vent and reduce air in time during an accident; in addition, most cold air venting valves have the problem of leakage in the venting channel when supplying air, resulting in loss of air volume and air pressure, which has an adverse impact on blast furnace output and energy saving and consumption reduction. Summary of the Invention

[0004] The purpose of this invention is to provide a cold air vent valve with anti-blocking function, which can at least solve some of the defects in the prior art.

[0005] To achieve the above objectives, the technical solution of the present invention is a cold air vent valve with anti-jamming function, comprising a butterfly valve housing and a valve plate disposed within the butterfly valve housing; the top of the butterfly valve housing is connected to an outer cylinder and a vent cylinder, and the vent cylinder is located inside the outer cylinder; a vent port is provided on the lower cylinder wall of the vent cylinder; a piston is disposed inside the vent cylinder; the piston opens or closes the vent port by reciprocating up and down movement; the piston is a cylindrical structure that runs vertically through the cylinder and a support plate is fixed on its inner wall; the support plate is connected to the valve plate through a linkage mechanism, and a through hole is provided on the support plate; the top of the vent cylinder is sealed by a blind flange.

[0006] As one embodiment, a limiting protrusion is provided on the outer wall of the piston top, and a limiting step is provided on the inner wall of the venting cylinder. The step surface of the limiting step is located above the venting port. The limiting protrusion and the limiting step cooperate to limit the downward movement of the piston in the venting cylinder.

[0007] As one embodiment, a limiting plate is provided inside the butterfly valve housing. When the piston moves downward until the limiting protrusion ring contacts the limiting step, the bottom of the piston contacts the limiting plate. Rubber sealing gaskets are provided on the limiting plate at the position corresponding to the piston and on the step surface of the limiting step.

[0008] As one embodiment, the limiting plate is provided with a through hole and a limiting hole, and the upper part of the linkage mechanism passes through the limiting hole.

[0009] As one embodiment, the linkage mechanism includes a connecting rod and a pull rod. One end of the connecting rod is hinged to the valve plate, and the other end of the connecting rod is hinged to one end of the pull rod. The other end of the pull rod passes through the support plate and is fixed by a nut.

[0010] As one embodiment, an elastic element is provided between the support plate and the nut.

[0011] As one embodiment, the elastic element is a spring or a disc spring assembly, wherein the disc spring assembly is composed of several pairs of disc springs stacked together.

[0012] As one embodiment, a ball joint is provided between the elastic element and the support plate, and the bottom of the ball joint is fixed to the support plate.

[0013] As one embodiment, a pressure plate is provided between the elastic element and the nut, and the nut is a double nut.

[0014] As one embodiment, the valve plate is connected to the drive device.

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

[0016] (1) In this invention, the piston is a cylindrical structure that runs through the top and bottom, and the support plate inside the piston is provided with through holes. The top of the venting cylinder is sealed by a blind flange. Therefore, when the piston moves up and down, its pressure is approximately the same. It is only subject to friction with the inner wall of the venting cylinder and is not subject to the positive pressure of the gas. The force is smaller. On the one hand, the piston is less likely to get stuck. On the other hand, the power of the driving device of the cold air venting valve can be reduced.

[0017] (2) In this invention, when the valve is in the air supply state, the limiting protrusion ring at the top of the piston and the rubber sealing gasket on the limiting step are pressed together, and the bottom of the piston and the rubber sealing gasket on the limiting plate are pressed together, so that the piston and the vent are all in a soft seal. Compared with the gap seal generally used, the sealing effect is greatly improved and leakage can be effectively avoided.

[0018] (3) In this invention, the valve plate and the piston share a set of driving devices. On the one hand, it reduces the number of driving devices and makes valve control simpler. On the other hand, when one channel (air supply channel or venting channel) is gradually closed, the other channel is gradually enlarged, so that the pressure fluctuation of the cold air main pipe is not too large, avoiding pressure buildup and making it safer.

[0019] (4) In this invention, the limiting plate can limit the pull rod so that it can only move along the piston axis, which can minimize the radial force on the piston and avoid piston jamming.

[0020] (5) By setting elastic elements, the present invention can effectively eliminate the situation where the piston stroke is too small and the valve plate cannot swing completely to the horizontal due to the size and assembly errors of the connecting rod and the tie rod, thus ensuring that the valve plate is subjected to the least force and scouring, and the pressure loss at the valve plate is minimized.

[0021] (6) By setting a ball joint, the present invention can effectively absorb the sway during the movement of the tie rod, ensuring that the disc spring is always compressed along the axial direction, and there will be no relative displacement between the disc springs, resulting in better force distribution. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A venting state view of a cold air vent valve with anti-blocking function provided in an embodiment of the present invention;

[0024] Figure 2 An air supply status view of a cold air vent valve with anti-blocking function provided in an embodiment of the present invention;

[0025] Figure 3 for Figure 2 Enlarged view at point A in the middle;

[0026] Figure 4 for Figure 2 Enlarged view at point B;

[0027] Figure 5 for Figure 2 A magnified view at point C;

[0028] In the diagram: 1. Outer cylinder; 2. Vent cylinder; 3. Blind flange; 4. Piston; 5. Support plate; 6. Tie rod; 7. Limiting plate; 8. Butterfly valve body; 9. Connecting rod; 10. Valve plate; 11. Double nut; 12. Pressure plate; 13. Disc spring assembly; 14. Ball joint pair; 15. Rubber sealing gasket; 16. Vent port. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0031] like Figures 1-2 As shown, this embodiment provides a cold air vent valve with anti-jamming function, including a butterfly valve housing 8 and a valve plate 10 disposed inside the butterfly valve housing 8; the top of the butterfly valve housing 8 is connected to an outer cylinder 1 and a vent cylinder 2, and the vent cylinder 2 is located inside the outer cylinder 1. A vent port 16 is provided on the lower cylinder wall of the vent cylinder 2. A piston 4 is provided inside the vent cylinder 2. The piston 4 opens or closes the vent port 16 by reciprocating up and down; the piston 4 is a cylindrical structure that runs through the top and bottom and a support plate 5 is fixed on the inner wall. The support plate 5 is connected to the valve plate 10 through a connecting rod 9 mechanism, and a through hole is provided on the support plate 5. The top of the vent cylinder 2 is closed by a blind flange 3.

[0032] The outer cylinder 1 is used to connect to an external silencer or venting pipe. The outer cylinder 1 is fitted outside the venting cylinder 2 and is not connected to the butterfly valve housing 8. The bottom of the venting cylinder 2 is connected to the top of the butterfly valve housing 8. Several venting ports 16 are provided circumferentially at intervals on the lower cylinder wall of the venting cylinder 2. The venting cylinder 2 is connected to the outer cylinder 1 through the venting ports 16. The support plate 5 can be welded to the inner wall of the piston 4.

[0033] In this embodiment, the valve plate 10 drives the piston 4 to reciprocate up and down through the connecting rod 9 and the support plate 5, so that the valve is in either the air supply state or the venting state. When the valve plate 10 is horizontal, the piston 4 moves downward and the venting port 16 is closed, the valve is in the air supply state. When the edge of the valve plate 10 is in contact with the inner wall of the butterfly valve housing 8, the piston 4 moves upward and the venting port 16 is open, the valve is in the venting state. Since the piston 4 is a cylindrical structure that runs vertically through the valve, and the support plate 5 on the inner wall of the piston 4 has a through hole, and the top of the venting cylinder 2 is closed by the blind flange 3, it can be approximated that when the piston 4 moves up and down, its pressure is the same, and it is only subjected to friction with the inner wall of the venting cylinder 2, and is not subjected to the positive pressure of the gas. Therefore, the piston 4 is less likely to get stuck, and the power of the driving device of the cold air venting valve can be reduced.

[0034] In the optimized embodiment, the valve plate 10 and the piston 4 share a set of driving devices, and the valve plate 10 is connected to the driving device (not shown in the figure). The driving device drives the valve plate 10 to swing inside the butterfly valve housing 8, and the valve plate 10 drives the piston 4 to move up and down in the venting cylinder 2 through the connecting rod 9 mechanism. When valve plate 10 moves in the opening direction, it pulls piston 4 down via connecting rod 9, gradually opening the air supply channel and gradually closing the venting channel. When valve plate 10 is horizontal, the air supply channel is fully open, piston 4 completely covers the venting port 16 on the wall of venting cylinder 2, and the venting channel is completely closed, allowing all cold air to be sent to the blast furnace via the air supply channel. When valve plate 10 moves in the closing direction, it pushes piston 4 upward via connecting rod 9, gradually closing the air supply channel and gradually opening the venting channel. When the edge of valve plate 10 is completely in contact with the inner wall of butterfly valve housing 8, the air supply channel is completely closed, piston 4 completely leaves the venting port 16, and the venting channel is fully open, allowing all cold air to be released via the venting channel. This design reduces the number of drive units and simplifies valve control. Furthermore, as one channel (air supply channel or venting channel) gradually closes, the other channel gradually increases, preventing excessive pressure fluctuations in the main cold air pipe, avoiding pressure buildup, and ensuring greater safety.

[0035] like Figures 1-4 As shown, a limiting ring is provided on the outer wall of the piston 4, and a limiting step is provided on the inner wall of the venting cylinder 2. The step surface of the limiting step is located above the venting port 16. The limiting ring and the limiting step cooperate to limit the downward movement of the piston 4 within the venting cylinder 2. Furthermore, a limiting plate 7 is provided inside the butterfly valve housing 8. When the piston 4 moves downward until the limiting ring contacts the limiting step, the bottom of the piston 4 contacts the limiting plate 7. Rubber sealing gaskets 15 are provided on the limiting plate 7 at the position corresponding to the piston 4 and on the step surface of the limiting step. When the valve is in the air supply state, the limiting ring on the top of the piston 4 and the rubber sealing gasket 15 on the limiting step are pressed together, and the bottom of the piston 4 and the rubber sealing gasket 15 on the limiting plate 7 are pressed together, so that the piston 4 and the venting port 16 are all surrounded by a soft seal. Compared with the generally used gap seal, the sealing effect is greatly improved, and leakage can be effectively avoided. Furthermore, in this embodiment, the gap between the outer wall of the piston 4 and the inner wall of the venting cylinder 2 can be set to be larger than that of the gap sealing method, which can effectively prevent the piston 4 from getting stuck.

[0036] Ideally, the limiting plate 7 is provided with a through hole and a limiting hole, and the upper part of the connecting rod 9 mechanism passes through the limiting hole. The through hole is used to connect the venting cylinder 2 and the butterfly valve housing 8, and the limiting hole is used to restrict the upper part (pull rod 6) of the connecting rod 9 mechanism so that it always moves along the axial direction of the piston 4.

[0037] Specifically, such as Figure 1 and Figure 2As shown, the linkage 9 mechanism includes a linkage 9 and a pull rod 6. One end of the linkage 9 is hinged to the valve plate 10, and the other end of the linkage 9 is hinged to one end of the pull rod 6. The other end of the pull rod 6 passes through the limiting plate 7 and the support plate 5 in sequence and is fixed to the support plate 5 with a nut. The valve plate 10 drives the piston 4 to move up and down reciprocally through the linkage 9 and the pull rod 6. When the valve plate 10 gradually closes, the valve plate 10 drives the pull rod 6 through the linkage 9 to push the piston 4 upward, and the vent 16 also gradually opens. When the valve plate 10 gradually opens, the valve plate 10 drives the pull rod 6 through the linkage 9 to pull the piston 4 downward, and the vent 16 also gradually closes. During this process, the limiting plate 7 can limit the pull rod 6, so that it can only move along the axial direction of the piston 4, which can minimize the radial bias force on the piston 4 and avoid the piston 4 getting stuck.

[0038] As a preferred embodiment, such as Figure 5 As shown, an elastic element is provided between the support plate 5 and the nut. This elastic element can be a spring or a disc spring assembly 13. Due to the large flow rate, high velocity, and high pressure of the cold air, to reduce the force and erosion on the valve plate 10 during air supply, and to minimize the cold air pressure loss at the valve plate 10, the valve plate 10 should be as horizontal as possible during normal air supply, thus minimizing the cross-sectional area of ​​the windward side. By setting the elastic element, the situation where the piston 4 stroke is too small due to dimensional and assembly errors of the connecting rod 9 and the tie rod 6, and the valve plate 10 cannot swing completely to a horizontal position, can be effectively eliminated, ensuring that the force and erosion on the valve plate 10 are minimized, and the pressure loss at the valve plate 10 is minimized. Further optimized, the elastic element is a disc spring assembly 13, composed of several pairs of stacked disc springs. The number of disc springs can be flexibly increased or decreased to adjust the safe cold air pressure value, depending on the different cold air pressures of different blast furnaces.

[0039] As a further preferred implementation, such as Figure 5 As shown, a ball joint 14 is provided between the elastic element and the support plate 5, and the bottom of the ball joint 14 is fixed to the support plate 5. By providing a pair of ball joints 14, the sway during the movement of the pull rod 6 can be effectively absorbed, ensuring that the disc spring is always compressed axially, and there is no relative displacement between the disc springs, resulting in better force distribution. Furthermore, a pressure plate 12 is provided between the elastic element and the nut. When the valve plate 10 gradually opens, the valve plate 10 drives the pull rod 6 to move downward through the connecting rod 9. The pressure plate 12 compresses the elastic element, thereby driving the piston 4 to move downward until the piston 4 completely covers the vent 16. Further optimized, the bottom surface of the pressure plate 12 and the top surface of the ball joint 14 are provided with limit grooves to limit the horizontal movement of the disc spring; the nut is a double nut 11, which can prevent loosening and facilitate disassembly.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cold air vent valve with anti-jamming function, comprising a butterfly valve housing and a valve plate disposed within the butterfly valve housing; characterized in that: The top of the butterfly valve housing is connected to an outer cylinder and a vent cylinder, with the vent cylinder located inside the outer cylinder. A vent port is provided on the lower wall of the vent cylinder, and a piston is provided inside the vent cylinder. The piston opens or closes the vent port by reciprocating up and down. The piston is a cylindrical structure that runs vertically through the valve, and a support plate is fixed on its inner wall. The support plate is connected to the valve plate through a linkage mechanism, and a through hole is provided on the support plate. The top of the vent cylinder is sealed by a blind flange. A limiting ring is provided on the outer wall of the piston top, and a limiting step is provided on the inner wall of the venting cylinder. The step surface of the limiting step is located above the vent. The limiting ring and the limiting step cooperate to limit the downward movement of the piston in the venting cylinder. A limiting plate is provided inside the butterfly valve housing. When the piston moves downward to the point where the limiting ring contacts the limiting step, the bottom of the piston contacts the limiting plate. Rubber sealing gaskets are provided on the limiting plate at the position corresponding to the piston and on the step surface of the limiting step. The linkage mechanism includes a connecting rod and a pull rod. One end of the connecting rod is hinged to the valve plate, and the other end of the connecting rod is hinged to one end of the pull rod. The other end of the pull rod passes through the limiting plate and the support plate in sequence and is fixed by a nut. An elastic element is provided between the support plate and the nut.

2. The cold air vent valve with anti-jamming function as described in claim 1, characterized in that: The limiting plate is provided with a through hole and a limiting hole, and the upper part of the linkage mechanism passes through the limiting hole.

3. The cold air vent valve with anti-jamming function as described in claim 1, characterized in that: The elastic element is a spring or a disc spring assembly, wherein the disc spring assembly is composed of several pairs of disc springs stacked together.

4. The cold air vent valve with anti-jamming function as described in claim 1, characterized in that: A ball joint is provided between the elastic element and the support plate, and the bottom of the ball joint is fixed to the support plate.

5. The cold air vent valve with anti-jamming function as described in claim 4, characterized in that: A pressure plate is provided between the elastic element and the nut, and the nut is a double nut.

6. The cold air vent valve with anti-jamming function as described in claim 1, characterized in that: The valve plate is connected to the drive device.

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