A cold air exhaust valve with a safe exhaust function

Abstract

The present application relates to the technical field of blast furnace ironmaking, and particularly relates to a cold air release valve with a safe release function, comprising a butterfly valve shell and a valve plate; an outer cylinder and a release cylinder are connected to the top of the butterfly valve shell, a release port is arranged on the release cylinder, a piston is arranged in the release cylinder, the piston opens or closes the release port through up-and-down reciprocating movement; the piston is in a cylindrical structure and a support plate is fixed to the inner wall of the piston, the valve plate is connected to a connecting rod mechanism, the top of the connecting rod mechanism penetrates through the support plate and is fixed through a nut, and an elastic element is arranged between the support plate and the nut; a pressure relief groove is arranged on the inner wall of the release cylinder. When the pressure of the cold air main pipe fluctuates and exceeds the safe pressure, the piston can still move upwards by a certain distance and expose the pressure relief groove under the action of the cold air pressure, the cold air is discharged through the pressure relief groove and the release port, the pressure of the cold air main pipe is lower than the safe pressure, and the problem that the equipment and the pipeline are damaged due to overpressure of the cold air main pipe caused by fluctuation of the cold air pressure can be effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of blast furnace ironmaking technology, specifically to a cold air venting valve with a safe venting 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 do not have the function of automatically relieving pressure when the pressure is too high, and they cannot play the role of automatic overpressure protection. There is a risk that the cold air pressure fluctuations may cause the cold air main pipe to be overpressurized, damaging equipment and pipelines. Moreover, 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 effect on blast furnace output and energy saving and consumption reduction. At the same time, the venting channel is prone to blockage, which poses a risk that the air cannot be released and reduced in time in case of an accident. Summary of the Invention

[0004] The purpose of this invention is to provide a cold air vent valve with a safe venting 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 a safe venting 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 venting cylinder, and the venting cylinder is located inside the outer cylinder; a venting port is provided on the lower wall of the venting cylinder; a piston is disposed inside the venting cylinder; the piston opens or closes the venting port by reciprocating up and down movement; the piston has a cylindrical structure and a support plate is fixed on its inner wall; the valve plate is connected to the bottom of a linkage mechanism; the top of the linkage mechanism passes through the support plate and is fixed by a nut; an elastic element is disposed between the support plate and the nut; a pressure relief groove communicating with the venting port is provided on the inner wall of the venting cylinder below the venting port.

[0006] 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.

[0007] 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.

[0008] As one embodiment, a pressure plate is provided between the elastic element and the nut, and the nut is a double nut.

[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 the nut.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] As one embodiment, the top of the venting cylinder is open, while the top of the piston is closed.

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

[0015] (1) By setting up a pressure relief groove and an elastic element, when the pressure fluctuation of the cold air main pipe exceeds the safe pressure, the cold air pressure pushes up the piston to compress the elastic element. Although the valve plate is locked and the linkage mechanism does not move, the piston can still move up a certain distance. When the pressure relief groove is exposed (the lower end of the piston has not reached the vent), the cold air is discharged through the pressure relief groove and the vent, the pressure of the cold air main pipe is reduced until it is lower than the safe pressure, the piston moves down and covers the pressure relief groove again. This can effectively avoid the problem of equipment and pipeline damage caused by the overpressure of the cold air main pipe due to the fluctuation of the cold air pressure.

[0016] (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.

[0017] (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.

[0018] (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.

[0019] (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.

[0020] (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

[0021] 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.

[0022] Figure 1 A venting state view of a cold air vent valve with a safe venting function provided in an embodiment of the present invention;

[0023] Figure 2 A view of the air supply status of a cold air vent valve with a safety venting function provided in an embodiment of the present invention;

[0024] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0025] Figure 4 for Figure 2 Enlarged view at point B;

[0026] Figure 5 for Figure 2 A magnified view at point C;

[0027] Figure 6 for Figure 2 DD section view;

[0028] In the diagram: 1. Outer cylinder; 2. Venting cylinder; 3. Pressure relief groove; 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. Venting 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 and Figure 6 As shown, this embodiment provides a cold air vent valve with a safe venting 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 venting cylinder 2, and the venting cylinder 2 is located inside the outer cylinder 1. A venting port 16 is provided on the lower cylinder wall of the venting cylinder 2. A piston 4 is provided inside the venting cylinder 2. The piston 4 opens or closes the venting port 16 by reciprocating up and down; the piston 4 has a cylindrical structure and a support plate 5 is fixed on its inner wall. The valve plate 10 is connected to the bottom of the connecting rod 9 mechanism. The top of the connecting rod 9 mechanism passes through the support plate 5 and is fixed by a nut. An elastic element is provided between the support plate 5 and the nut; a pressure relief groove 3 communicating with the venting port 16 is provided on the inner wall of the venting cylinder 2 at a position below the venting port 16.

[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 move up and down reciprocally through the connecting rod 9 mechanism and the support plate 5, so that the valve is in the air supply state or the venting state. When the valve plate 10 is horizontal, the piston 4 moves down and the venting port 16 is closed (the bottom of the piston 4 covers the pressure relief groove 3), 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 up and the venting port 16 is opened, the valve is in the venting state. Because a pressure relief groove 3 is provided on the inner wall of the vent cylinder 2 below the vent port 16, when the pressure fluctuation of the cold air main pipe exceeds the safe pressure, the cold air pressure pushes the piston 4 to compress the elastic element. Although the valve plate 10 is locked by the drive device and the connecting rod 9 mechanism does not move, the piston 4 can still move up a certain distance. When the pressure relief groove 3 is exposed (the lower end of the piston 4 does not reach the vent port 16), the cold air is discharged through the pressure relief groove 3 and the vent port 16, and the pressure of the cold air main pipe decreases until it is lower than the safe pressure. The piston 4 moves down and covers the pressure relief groove 3 again, which can effectively avoid the problem of overpressure in the cold air main pipe caused by cold air pressure fluctuation and damage to equipment and pipelines.

[0034] Because the cold air has a large flow rate, high velocity, and high pressure, in order to reduce the force and erosion on the valve plate 10 during air supply and to reduce the cold air pressure loss at the valve plate 10, the valve plate 10 should be as horizontal as possible during normal air supply, so as to minimize the cross-sectional area of ​​the windward surface. By setting up elastic elements, the situation where the piston 4 stroke is too small due to the size and assembly errors of the connecting rod 9 and the tie rod 6, and the valve plate 10 cannot swing completely to the horizontal position can be effectively eliminated, so as to ensure that the force and erosion on the valve plate 10 are minimized and the pressure loss at the valve plate 10 is minimized.

[0035] In this embodiment, the elastic element can be a spring or a disc spring assembly 13. In a further optimized embodiment, the elastic element is a disc spring assembly 13, which is composed of several pairs of disc springs stacked together. The number of disc springs can be flexibly increased or decreased to adjust the safe pressure value of the cold air, depending on the different cold air pressures of different blast furnaces.

[0036] Optimize the above embodiments, 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 and the pressure relief groove 3. 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.

[0037] 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, and piston 4 completely covers the venting port 16 and pressure relief groove 3 on the wall of venting cylinder 2, completely closing the venting channel. All cold air is then sent to the blast furnace through 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 through 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.

[0038] Specifically, such as Figure 1 and Figure 2 As shown, the linkage 9 mechanism includes a connecting rod 9 and a pull rod 6. One end of the connecting rod 9 is hinged to the valve plate 10, and the other end of the connecting rod 9 is hinged to one end of the pull rod 6. The other end of the pull rod 6 passes through the support plate 5 and is fixed by a nut. The valve plate 10 drives the piston 4 to move up and down reciprocally through the connecting rod 9 and the pull rod 6. When the valve plate 10 gradually closes, the valve plate 10 drives the pull rod 6 through the connecting rod 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 connecting rod 9 to pull the piston 4 downward, and the vent 16 also gradually closes.

[0039] like Figures 1-4As 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.

[0040] Ideally, the limiting plate 7 is provided with a through hole and a limiting hole, with the upper part of the connecting rod 9 mechanism passing through the limiting hole. The through hole is used to connect the venting cylinder 2 and the butterfly valve housing 8, while the limiting hole is used to restrict the upper part (pull rod 6) of the connecting rod 9 mechanism, ensuring that it always moves along the axial direction of the piston 4. This can minimize the radial bias force on the piston 4 and prevent the piston 4 from getting stuck.

[0041] In this embodiment, the top of the venting cylinder 2 is open, and the top of the piston 4 is closed, such as... Figure 1 and Figure 2 As shown; alternatively, the top of the piston 4 can be opened and the top of the venting cylinder 2 can be closed.

[0042] 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 venting valve with a safety venting 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 venting cylinder, with the venting cylinder located inside the outer cylinder. A venting port is provided on the lower wall of the venting cylinder, and a piston is provided inside the venting cylinder. The piston opens or closes the venting port by reciprocating up and down. The piston has a cylindrical structure and a support plate is fixed on its inner wall. The valve plate is connected to the bottom of the linkage mechanism, and the top of the linkage mechanism passes through the support plate and is fixed by a nut. An elastic element is provided between the support plate and the nut. A pressure relief groove communicating with the venting port is provided on the inner wall of the venting cylinder below the venting port.

2. The cold air vent valve with safety venting 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.

3. The cold air vent valve with safety venting 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.

4. The cold air vent valve with safety venting function as described in claim 1, characterized in that: A pressure plate is provided between the elastic element and the nut, and the nut is a double nut.

5. The cold air vent valve with safety venting function as described in claim 1, characterized in that: 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 the nut.

6. The cold air vent valve with safety venting function as described in claim 1, characterized in that: 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.

7. The cold air vent valve with safety venting function as described in claim 6, characterized in that: 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.

8. The cold air vent valve with safety venting function as described in claim 7, 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.

9. The cold air vent valve with safety venting function as described in claim 1, characterized in that: The top of the venting cylinder is open, while the top of the piston is closed.

10. The cold air vent valve with safety venting function as described in claim 1, characterized in that: The valve plate is connected to the drive device.

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