Blast furnace top charging bucket gas pressure release valve

Abstract

The utility model discloses a blast furnace top charging bucket gas pressure release valve which comprises a valve shell, a valve seat and a valve plate, and the caliber of a lower end port of the valve seat is gradually increased from top to bottom to form a horn mouth; a crank and a swing arm are installed on a rotating shaft, the crank is hinged to an oil cylinder, the valve plate is installed at the tail end of the swing arm, the valve plate is in a circular truncated cone shape, the outer wall of the valve plate and the inner wall of the horn mouth are both covered with abrasion-resistant alloy layers, a valve plate sealing ring is further coaxially installed on the outer wall of the valve plate, and the valve plate sealing ring is connected with the valve plate. The valve plate extends into the horn mouth of the pipe hole to be matched with the horn mouth of the pipe hole. According to the blast furnace top charging bucket gas pressure release valve, when the valve plate is matched with the valve seat, lateral extrusion force is formed between the valve plate and the valve seat, the lateral extrusion force can enable the valve plate to be extruded towards the valve seat all the time, and better sealing performance can be achieved between the valve plate and the valve seat; and friction force can be formed, so that the valve plate and the valve seat are not easy to fall off and separate.

Description

Technical Field

[0001] The utility model relates to the technical field of iron-making blast furnaces, in particular to a gas pressure relief valve for a top charging hopper of a blast furnace. Background Art

[0002] The gas pressure relief valve for a top charging hopper of an iron-making blast furnace generally includes a valve seat and a valve plate. Among them, the valve seat is fixedly installed inside the valve housing, and the valve plate is installed on the swing arm of the rotating shaft. The rotating shaft is driven by an oil cylinder to drive the crank to rotate, and the rotating shaft drives the swing of the swing arm and the valve plate thereon, thereby realizing the sealing and opening of the valve plate and the valve seat. The existing gas pressure relief valves for top charging hoppers of iron-making blast furnaces have the following disadvantages:

[0003] 1. The valve seat and the valve plate are in plane contact for sealing. A certain pressure needs to be applied between the valve seat and the valve plate to achieve good sealing, which is difficult and the sealing performance of the pressure relief valve is poor.

[0004] 2. Due to the installation accuracy, it is difficult for the valve seat and the valve plate to be in ideal plane contact. The movement trend of the valve plate is often inconsistent with the direction of the reaction force of the valve seat, resulting in easy wear of the sealing ring, easy leakage of the pressure relief valve, and the contact surface is not wear-resistant due to gas flow erosion when leaking, and the service life of the pressure relief valve is short.

[0005] 3. The valve seat is fixed inside the valve housing. When the pressure relief valve is damaged and needs to be replaced, it is difficult to disassemble the valve seat and it cannot be replaced online, which is time-consuming and laborious.

[0006] 4. The packing seal is used between the rotating shaft and the valve housing, with insufficient reliability, poor sealing performance, and easy gas leakage.

[0007] 5. The bearings for installing the rotating shaft are inlaid on both side walls inside the valve housing, which is not convenient for disassembly and replacement.

[0008] 6. Dust and materials are likely to accumulate at the lower part of the valve housing, blocking the movement of the valve body of the pressure relief valve.

[0009] 7. The manhole on the valve housing is not set on the swing path of the valve plate. The valve plate cannot swing to the manhole. Workers can only enter the valve housing to repair and replace the valve plate outside the manhole. There is gas in the valve housing and it is a confined space, making it very difficult to repair and replace the valve plate. Content of the Utility Model

[0010] The purpose of the utility model is to provide a gas pressure relief valve for a top charging hopper of a blast furnace.

[0011] The technical solution for achieving the purpose of the utility model is: a blast furnace top tank gas pressure relief valve, comprising a valve shell, a valve seat and a valve plate, the valve seat being a tubular structure, the valve seat having a pipe hole, the valve seat being vertically mounted on the valve shell, the lower end port of the pipe hole extending into the valve shell, the diameter of the lower end port of the pipe hole gradually increasing from top to bottom to form a bell mouth; a rotating shaft is rotatably mounted through a bearing, the rotating shaft is horizontally arranged and passes through the valve shell, a crank and a swing arm are mounted on the rotating shaft, the crank The handle is located outside the valve housing, the crank is hinged to an oil cylinder and is driven to swing by the oil cylinder, the swing arm and the valve plate are located inside the valve housing, the valve plate is installed on the tail end of the swing arm, the valve plate is horizontal, and the valve plate is frustum-shaped. The outer wall of the valve plate and the inner wall of the bell mouth are covered with a wear-resistant alloy layer, and a valve plate sealing ring is coaxially installed on the outer wall of the valve plate. The valve plate extends into the bell mouth of the pipe hole, and the outer wall of the valve plate and the inner wall of the bell mouth are adapted to each other.

[0012] Furthermore, the valve plate and the tail end of the swing arm are detachably mounted via bolts, and a gasket is stacked between the valve plate and the tail end of the swing arm. After the valve plate and the swing arm are mounted via the bolts, they are not only convenient for disassembly, assembly, and replacement, but more importantly, after the gasket is stacked between the valve plate and the tail end of the swing arm, gaskets of different thicknesses can be easily replaced, so that the installation of the valve plate can be adjusted. The valve plate and the swing arm can ultimately be leveled, so that after the valve plate and the valve seat are matched, the movement trend of the valve plate and the direction of the reaction force of the valve seat can approach the same straight line direction. The valve plate sealing ring is less likely to wear and leak due to the inconsistency between the movement trend of the valve plate and the direction of the reaction force of the valve seat, thereby improving the service life of the pressure relief valve.

[0013] Furthermore, the valve seat is embedded in the valve housing, and a short pipe is coaxially mounted on the upper end of the valve seat. The short pipe, the valve seat, and the valve housing are sequentially connected via a flange assembly. When the valve seat needs to be replaced, the embedded valve seat can be directly removed and assembled from outside the valve housing via the flange assembly without entering the valve housing. This makes disassembly and assembly of the valve seat more convenient, saving time and effort.

[0014] Furthermore, the valve plate sealing ring is a high-temperature and corrosion-resistant fluororubber sealing ring. Blast furnace top gas is hot and corrosive, so the high-temperature and corrosion-resistant fluororubber sealing ring has a longer service life.

[0015] Further, a valve housing sealing ring is coaxially installed between the rotating shaft and the valve housing it passes through. The cross-section of the valve housing sealing ring is V-shaped, and the V-shaped opening of the valve housing sealing ring faces the inner side of the valve housing. After the valve housing sealing ring with a V-shaped cross-section is installed between the rotating shaft and the valve housing it passes through, a relatively large pre-tightening force can be formed inside and outside the rotating shaft and the valve housing it passes through. Under the action of this relatively large pre-tightening force, the valve housing sealing ring fits more closely with the rotating shaft and the valve housing, and the sealing performance is also better. Moreover, with high pressure inside the valve housing and the V-shaped opening of the valve housing sealing ring facing the inner side of the valve housing, the high-pressure action can expand the V-shaped opening of the valve housing sealing ring, making it fit more closely with the rotating shaft and the valve housing, improving the sealing performance of the valve housing sealing ring, effectively preventing gas leakage between the rotating shaft and the valve housing it passes through, and at the same time greatly ensuring the stability and safety of the valve housing sealing ring.

[0016] Further, the bearing is installed in a bearing seat, and the bearing seat is located outside the valve housing. The external bearing seat can facilitate the installation, replacement, and maintenance of the bearing more conveniently.

[0017] Further, the bearing seat is an upper and lower split-type bearing seat. The upper and lower split-type bearing seat can greatly improve the convenience of overhaul and maintenance.

[0018] Further, a manhole is provided on the side wall of the valve housing. The manhole is located on the side of the swing path of the valve plate and close to the swing path of the valve plate. With this setting, when inspecting and maintaining the valve plate, the valve plate can be swung to the manhole, and an operator can operate on the valve plate at the manhole, thus greatly facilitating the overhaul and replacement of the valve plate.

[0019] Further, the lower part of the valve housing is a conical opening. The setting of the conical opening can prevent material and ash accumulation in the valve housing and avoid the movement space of the valve plate being blocked by the accumulated material at the lower part of the valve housing.

[0020] Further, the oil cylinder is hinged and installed on the valve housing.

[0021] The gas pressure relief valve of the blast furnace top charging hopper of the present utility model has the lower end port of the pipe hole set as a flared opening. At the same time, the valve plate is set as a frustum of a cone. When the pressure relief valve is closed, the valve plate can extend into the flared opening of the pipe hole, and the outer wall of the valve plate is adapted to the inner wall of the flared opening. Under this closed structure, when the frustum-shaped valve plate is forced to extend into the flared opening and cooperate with the valve seat, a lateral extrusion force is formed between the valve plate and the valve seat. This lateral extrusion force can not only make the valve plate always extrude towards the valve seat, so that a better sealing performance can be achieved between the valve plate and the valve seat, greatly improving the sealing effect of the pressure relief valve and preventing gas leakage; but also a frictional force can be formed, making it difficult for the valve plate and the valve seat to fall off and separate. After the pressure relief valve is closed, there is no need to continuously apply force subsequently, and the operation is more energy-saving.

[0022] For the gas pressure relief valve of the blast furnace top charging hopper of the present utility model, the outer walls of the valve plate and the inner wall of the flared opening are both covered with the wear-resistant alloy layer. The setting of the wear-resistant alloy layer can greatly improve the hardness, wear resistance and high-temperature resistance of the outer wall of the valve plate and the inner wall of the flared opening, making it not easy for the valve plate and the valve seat to be worn during long-term use, reducing the equipment failure rate. While being able to withstand high-speed and high-load environments, a stable and reliable hard seal can also be formed between the valve plate and the valve seat. Combined with the soft seal of the valve plate sealing ring, the soft-hard combined sealing structure is more reliable and the sealing effect is better.

[0023] In addition, for the gas pressure relief valve of the blast furnace top charging hopper of the present utility model, during sealing, both the swing arm and the valve plate are in a horizontal state. In the horizontal state, the movement trend of the valve plate and the reaction force direction of the valve seat can approach the same straight line direction. The valve plate sealing ring is not easy to be worn and leaked due to the inconsistency between the movement trend of the valve plate and the reaction force direction of the valve seat. The sealing performance and stability of the pressure relief valve are higher, and the service life is longer. Description of the Drawings

[0024] Figure 1 is the front view structural schematic diagram of the gas pressure relief valve of the blast furnace top charging hopper of the present utility model;

[0025] Figure 2 is the side view partial sectional structural schematic diagram of the gas pressure relief valve of the blast furnace top charging hopper of the present utility model;

[0026] Figure 3 is Figure 2 the sectional structural schematic diagram along line A-A;

[0027] Figure 4 is Figure 3 the structural schematic diagram of the valve seat and the valve plate in

[0028] Figure 5 is Figure 2Schematic enlarged structure diagram of local B. Detailed implementation manners

[0029] The following will make a detailed description of the preferred implementation manners of the gas pressure relief valve for the blast furnace top charging hopper of the present utility model with reference to the accompanying drawings:

[0030] As Figures 1 to 5 shown, a gas pressure relief valve for a blast furnace top charging hopper includes a valve housing 1, a valve seat 2 and a valve plate 3. The valve seat 2 is a pipe body structure and has a pipe hole 21. The valve seat 2 is vertically installed on the valve housing 1, and the lower end port of the pipe hole 21 extends into the valve housing 1. The caliber of the lower end port of the pipe hole 21 gradually becomes larger from top to bottom to form a flared opening 211. A rotating shaft 4 is rotatably installed through a bearing 40. The rotating shaft 4 is horizontally arranged and passes through the valve housing 1. A crank 41 and a swing arm 42 are installed on the rotating shaft 4. The crank 41 is located outside the valve housing 1 and is hinged to an oil cylinder 5 and is driven by the oil cylinder 5 to swing. The swing arm 42 and the valve plate 3 are located inside the valve housing 1. The valve plate 3 is installed on the tail end 421 of the swing arm 42. The valve plate 3 is horizontal and is in a frustum shape. Wear-resistant alloy layers 10 are covered on the outer wall of the valve plate 3 and the inner wall of the flared opening 211. A valve plate sealing ring 31 is coaxially installed on the outer wall of the valve plate 3. The valve plate 3 extends into the flared opening 211 of the pipe hole 21, and the outer wall of the valve plate 3 is adapted to the inner wall of the flared opening 211.

[0031] For the gas pressure relief valve of the blast furnace top charging hopper of the present utility model, the valve housing 1 serves as the housing of the pressure relief valve and is used for installation with the blast furnace top charging hopper. The valve seat 2 and the valve plate 3 cooperate to serve as the valve core of the pressure relief valve. Among them, the valve seat 2 has the pipe hole 21 as the passage for opening and closing. The valve plate 3 is driven by the oil cylinder 5 and can swing. The swinging valve plate 3 can block the pipe hole 21 to close the pressure relief valve, or can not block the pipe hole 21 to open the pressure relief valve.

[0032] The gas pressure relief valve of the blast furnace top charging hopper of the present utility model is installed on the blast furnace top charging hopper and is used for gas pressure relief. When the blast furnace is operating normally and there is no need for pressure relief, the oil cylinder 5 drives to drive the crank 41 to swing, and then the rotating shaft 4 rotates. The rotating rotating shaft 4 drives the swing arm 42, so that the valve plate 3 at the tail end of the swing arm swings towards the side close to the valve seat 2, causing the valve plate 3 to extend into the flared opening 211 of the pipe hole 21. The swing arm 42 and the valve plate 3 thereon are horizontal. The outer wall of the valve plate 3 is adapted to the inner wall of the flared opening 211. The valve plate 3 blocks the pipe hole 21 of the valve seat 2, seals and closes, and the pressure relief valve is closed. When the top pressure of the blast furnace is too high and pressure relief is required, the oil cylinder 5 drives to drive the crank 41 to swing, and then the rotating shaft 4 rotates. The rotating rotating shaft 4 drives the swing arm 42, so that the valve plate 3 at the tail end of the swing arm swings away from the valve seat 2, causing the valve plate 3 to withdraw from the pipe hole 21, and the valve plate 3 is completely separated from the valve seat 2, and the pressure relief valve is opened.

[0033] The gas pressure relief valve of the blast furnace top charging hopper of the present utility model sets the lower end port of the pipe hole 21 as a flared opening 211. At the same time, the valve plate 3 is set in a frustum shape. When the pressure relief valve is closed, the valve plate 3 can extend into the flared opening 211 of the pipe hole 21, and the outer wall of the valve plate 3 is adapted to the inner wall of the flared opening 211. Under this closed structure, when the frustum-shaped valve plate 3 is forced to extend into the flared opening 211 and cooperate with the valve seat 2, a lateral extrusion force is formed between the valve plate 3 and the valve seat 2. This lateral extrusion force can not only make the valve plate 3 always extrude towards the valve seat 2, and there can be better sealing performance between the valve plate 3 and the valve seat 2, greatly improving the sealing effect of the pressure relief valve and preventing gas leakage; but also a frictional force can be formed, making it difficult for the valve plate 3 and the valve seat 2 to fall off and separate. After the pressure relief valve is closed, there is no need to continuously apply force in the subsequent process, and the operation is more energy-saving.

[0034] For the gas pressure relief valve of the blast furnace top charging hopper of the present utility model, the outer wall of the valve plate 3 and the inner wall of the flared opening 211 are both covered with the wear-resistant alloy layer 10. The setting of the wear-resistant alloy layer 10 can greatly improve the hardness, wear resistance and high-temperature resistance of the outer wall of the valve plate 3 and the inner wall of the flared opening 211, making it not easy for the valve plate 3 and the valve seat 2 to be worn during long-term use, reducing the equipment failure rate. While being able to withstand high-speed and high-load environments, a stable and reliable hard seal can also be formed between the valve plate 3 and the valve seat 2. Combined with the soft seal of the valve plate sealing ring 31, the soft-hard combined sealing structure is more reliable and the sealing effect is better.

[0035] In addition, when the utility model is sealed, the gas pressure relief valve of the blast furnace top material tank is in a horizontal state. In the horizontal state, the movement trend of the valve plate 3 and the direction of the reaction force of the valve seat 2 can approach the same straight line direction. The valve plate sealing ring 31 is not easy to wear and leak due to the inconsistency between the movement trend of the valve plate 3 and the direction of the reaction force of the valve seat 2. The pressure relief valve has higher sealing and stability and longer service life.

[0036] In the utility model, the gas pressure relief valve for the blast furnace top tank is preferably detachably mounted between the valve plate 3 and the tail end 421 of the swing arm 42 via bolts 6, and a gasket 61 is stacked between the valve plate 3 and the tail end 421 of the swing arm 42. After the valve plate 3 and the swing arm 42 are mounted via the bolts 6, they are not only convenient for disassembly, assembly, and replacement, but more importantly, after the gasket 61 is stacked between the valve plate 3 and the tail end 421 of the swing arm 42, the gasket 61 of different thicknesses can be conveniently replaced, so that the installation of the valve plate 3 can be adjusted. The valve plate 3 and the swing arm 42 can ultimately be level, so that after the valve plate 3 is matched with the valve seat 2, the movement trend of the valve plate 3 and the direction of the reaction force of the valve seat 2 can approach the same straight line direction, and the valve plate sealing ring 31 is not easily worn and leaked due to the inconsistency between the movement trend of the valve plate 3 and the direction of the reaction force of the valve seat 2, thereby improving the service life of the pressure relief valve.

[0037] In the utility model, the gas pressure relief valve for the blast furnace top tank is preferably configured such that the valve seat 2 is embedded in the valve housing 1, a short pipe 7 is coaxially mounted on the upper end of the valve seat 2, and the short pipe 7, the valve seat 2, and the valve housing 1 are sequentially connected via a flange assembly 8. When the valve seat 2 needs to be replaced, manual labor can be performed outside the valve housing 1 without entering the valve housing 1, and the embedded valve seat 2 can be directly removed and assembled via the flange assembly 8, making the disassembly and assembly of the valve seat 2 more convenient and time-saving.

[0038] In the utility model of the blast furnace top tank gas pressure relief valve, the valve plate sealing ring 31 is preferably a high-temperature and corrosion-resistant fluororubber sealing ring. The blast furnace top gas is hot and corrosive, and the high-temperature and corrosion-resistant fluororubber sealing ring has a longer service life.

[0039] The gas pressure relief valve of the charging hopper at the top of the blast furnace of the present utility model. Preferably, a valve housing sealing ring 43 is coaxially installed between the rotating shaft 4 and the valve housing 1 it passes through. The cross-section of the valve housing sealing ring 43 is V-shaped, and the V-shaped opening of the valve housing sealing ring 43 faces the inner side of the valve housing 1. After the valve housing sealing ring 43 with a V-shaped cross-section is installed between the rotating shaft 4 and the valve housing 1 it passes through, a relatively large pre-tightening force can be formed between the inside and outside of the rotating shaft 4 and the valve housing 1 it passes through. Under the action of this relatively large pre-tightening force, the valve housing sealing ring 43 fits more closely with the rotating shaft 4 and the valve housing 1, and the sealing performance is also better. Moreover, with high pressure inside the valve housing 1, under the setting structure where the V-shaped opening of the valve housing sealing ring 43 faces the inner side of the valve housing 1, the high-pressure action can expand the V-shaped opening of the valve housing sealing ring 43, making it fit more closely with the rotating shaft 4 and the valve housing 1, improving the sealing performance of the valve housing sealing ring 43. While effectively preventing gas leakage between the rotating shaft 4 and the valve housing 1 it passes through, it can also greatly ensure the stability and safety of the valve housing sealing ring 43.

[0040] The gas pressure relief valve of the charging hopper at the top of the blast furnace of the present utility model. Preferably, the bearing 40 is installed in the bearing seat 401, and the bearing seat 401 is located outside the valve housing 1. The external bearing seat 401 can facilitate the installation, replacement, and maintenance of the bearing 40 more conveniently.

[0041] The gas pressure relief valve of the charging hopper at the top of the blast furnace of the present utility model. Preferably, the bearing seat 401 is an upper and lower split bearing seat. The upper and lower split bearing seat can greatly improve the convenience of overhaul and maintenance.

[0042] The gas pressure relief valve of the charging hopper at the top of the blast furnace of the present utility model. Preferably, a manhole 11 is provided on the side wall of the valve housing 1. The manhole 11 is located on the side of the swinging path of the valve plate 3 and close to the swinging path of the valve plate 3. With this setting, when detecting and maintaining the valve plate 3, the valve plate 3 can be swung to the position of the manhole 11, and an operator can operate on the valve plate 3 at the manhole 11. In this way, the overhaul and replacement of the valve plate 3 are greatly facilitated.

[0043] The gas pressure relief valve of the charging hopper at the top of the blast furnace of the present utility model. Preferably, the lower part of the valve housing 1 is a conical opening 12. The setting of the conical opening 12 can prevent material and ash accumulation in the valve housing 1 and avoid blocking the movement space of the valve plate 3 due to material accumulation at the lower part of the valve housing 1.

[0044] For the gas pressure relief valve of the charging hopper at the top of the blast furnace of the present utility model, the oil cylinder 5 is hingedly installed on the valve housing 1.

[0045] For those of ordinary skill in the art to which the present utility model pertains, without departing from the concept of the present utility model, several simple deductions or substitutions can still be made, and all should be regarded as falling within the protection scope of the present utility model.

Claims

1. A blast furnace top bunker gas pressure relief valve, comprising a valve housing, a valve seat and a valve plate, characterized in that: The valve seat is a tubular structure with a tube hole. The valve seat is vertically installed on the valve housing, and the lower end port of the tube hole extends into the valve housing. The caliber of the lower end port of the tube hole gradually increases from top to bottom to form a flared opening. A rotating shaft is rotatably installed through a bearing. The rotating shaft is horizontally arranged and passes through the valve housing. A crank and a swing arm are installed on the rotating shaft. The crank is located outside the valve housing and is hinged to an oil cylinder and driven to swing by the oil cylinder. The swing arm and the valve plate are located inside the valve housing. The valve plate is installed at the tail end of the swing arm. The valve plate is horizontal and in the shape of a frustum of a cone. Wear-resistant alloy layers are covered on the outer wall of the valve plate and the inner wall of the flared opening. A valve plate sealing ring is coaxially installed on the outer wall of the valve plate. The valve plate extends into the flared opening of the tube hole, and the outer wall of the valve plate is adapted to the inner wall of the flared opening.

2. The blast furnace top bunker gas pressure relief valve according to claim 1, wherein: The valve plate and the tail end of the swing arm are detachably installed through bolts, and a gasket is stacked between the valve plate and the tail end of the swing arm.

3. The blast furnace top bunker gas pressure relief valve according to claim 1, characterized in that: The valve seat is embedded in the valve housing, and a short connecting pipe is coaxially installed at the upper end of the valve seat. The short connecting pipe, the valve seat and the valve housing are sequentially connected through a flange assembly.

4. The gas pressure relief valve for the top bunker of the blast furnace according to claim 1, characterized in that: The valve plate sealing ring is a high-temperature and corrosion-resistant fluororubber sealing ring.

5. The gas pressure relief valve for the top bunker of the blast furnace according to claim 1, wherein: A valve housing sealing ring is coaxially installed between the rotating shaft and the valve housing it passes through. The cross-section of the valve housing sealing ring is V-shaped, and the V-shaped opening of the valve housing sealing ring faces the inside of the valve housing.

6. The blast furnace top bunker gas pressure relief valve according to claim 1, characterized in that: The bearing is installed in a bearing seat, and the bearing seat is located outside the valve housing.

7. The blast furnace top bunker gas pressure relief valve according to claim 6, characterized in that: The bearing seat is an upper and lower split bearing seat.

8. The blast furnace top bunker gas pressure relief valve according to claim 1, characterized in that: A manhole is provided on the side wall of the valve housing. The manhole is located on the side of the swinging path of the valve plate and close to the swinging path of the valve plate.

9. The blast furnace top bunker gas pressure relief valve according to claim 1, characterized in that: The lower part of the valve housing is a conical opening.

10. The blast furnace top bunker gas pressure relief valve according to claim 1, characterized in that: The oil cylinder is hinged and installed on the valve housing.

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