Sealing device and large valve

Abstract

The utility model discloses a sealing device and a large valve, and relates to the technical field of blast furnace valves, the sealing device is used for sealing the large valve with flange leakage, and the sealing device comprises a plurality of first sealing plates, a plurality of second sealing plates and a plurality of second sealing plates, one ends of the second sealing plates are connected with the two ends of the first sealing plate respectively, the other ends of the second sealing plates are welded to a valve, and the first sealing plate and the second sealing plates wrap a flange opening which cannot be subjected to gas stopping treatment to form a closed space; and the exhaust assembly is mounted on any one of the first sealing plates. The sealing space is formed by splicing the first sealing plate and the second sealing plate on the outer side of the flange opening which cannot be subjected to gas stopping treatment, the flange with leakage is sealed, the sealing gas tightness is detected through the exhaust assembly, and the flange can be isolated and sealed without shutdown; and energy and economic losses caused by equipment isolation or shutdown are reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of blast furnace valves, and specifically relates to a sealing device and a large valve. Background Art

[0002] The hot blast furnace can provide high-temperature hot blast for the blast furnace by burning blast furnace gas or enriched gas, which is beneficial to the blast furnace's enhanced smelting, reduced fuel consumption, and reduced production costs. The hot blast furnace system includes multiple pipelines such as hot blast, cold blast, gas, and air, and is equipped with various large valves (diameter 1200mm-2360mm) such as hot blast valves, air combustion valves, and gas combustion valves. Due to the influence of complex factors such as insufficient compression force of the sealing gasket, roughness of the flange joint surface that does not meet the requirements, gasket deformation and mechanical vibration, bolt deformation or elongation, and gasket aging, the valve flange will leak air. If it is not discovered and handled in time, it will affect the stability of the air supply system. In severe cases, hot air burning and gas leakage may occur, resulting in more serious consequences. During normal production, the valve flanges at some points in the air supply system are under pressure for a long time, and it is impossible to directly replace the sealing gasket after the leakage point occurs. Therefore, it is necessary to use an online treatment method for large valve flange leakage. Utility Model Content

[0003] The purpose of the present application is to provide a sealing device and a large valve, aiming to solve the technical problem that air leakage in a hot blast furnace is difficult to repair to at least a certain extent.

[0004] In order to solve the above technical problems, this application adopts the following technical solutions:

[0005] A first aspect of an embodiment of the present application provides a sealing device for sealing a large valve with flange leakage, the sealing device comprising: a plurality of first sealing plates, which are arranged in a ring around the arc surface of the flange; a plurality of second sealing plates, wherein one end of the plurality of second sealing plates are respectively connected to the two ends of the first sealing plates, and the other ends of the plurality of second sealing plates are welded to the valve, and the first sealing plates and the second sealing plates wrap the flange opening that cannot be shut down for gas treatment to form an enclosed space; and an exhaust assembly, which is installed on any one of the first sealing plates.

[0006] In some embodiments, the first sealing plate is an arc plate, and a plurality of the first sealing plates are spliced ​​on the outer ring of the flange to form a ring.

[0007] In some embodiments, the second sealing plate is a vertical plate, and a longitudinal cross-section of the second sealing plate is fan-shaped.

[0008] In some embodiments, the exhaust assembly includes: a welding wire head, a mounting hole is processed on any one of the first sealing plates, and the welding wire head is fixed to the mounting hole; and an exhaust valve is installed on the welding wire head.

[0009] In some embodiments, the exhaust valve is a DN15-DN50 ball valve.

[0010] In some embodiments, the first sealing plate is made of steel plate.

[0011] In some embodiments, the second sealing plate is made of steel plate.

[0012] In some embodiments, the thickness of the first sealing plate is 10 mm to 12 mm.

[0013] In some embodiments, the second sealing plate has a thickness of 10 mm to 12 mm.

[0014] A second aspect of an embodiment of the present application provides a large valve, wherein the sealing device is installed at the flange of the valve where gas cannot be shut down.

[0015] It can be seen from the above technical solution that the present application has at least the following advantages and positive effects:

[0016] The sealing device in the present application forms a sealed space by splicing a first sealing plate and a second sealing plate on the outer side of the flange opening where gas cannot be stopped, thereby sealing the leaking flange, and testing the air tightness of the seal through an exhaust assembly. The flange can be isolated and sealed without stopping work, thereby reducing energy and economic losses caused by equipment isolation or shutdown, and effectively eliminating the hidden dangers of equipment failure caused by leakage.

[0017] A large valve in the present application is provided with a sealing device, and a sealing space is formed by splicing a first sealing plate and a second sealing plate on the outside of a flange opening where gas cannot be stopped, so as to seal a leaking flange, and the air tightness of the seal is tested by an exhaust assembly, so that the flange can be isolated and sealed without stopping work; thus reducing energy and economic losses caused by equipment isolation or shutdown; and effectively eliminating the hidden dangers of equipment failure caused by leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 is a structural schematic diagram of a sealing device in an embodiment of the present application;

[0020] Figure 2 is a schematic diagram of a valve that needs to be repaired in an embodiment of the present application;

[0021] Figure 3 is a schematic structural diagram of the first sealing plate in an embodiment of the present application;

[0022] Figure 4 It is a schematic diagram of the structure of the second sealing plate in the embodiment of the present application.

[0023] The description of the accompanying drawings is as follows: 1. medium pipeline; 2. flange; 3. sealing gasket; 4. stud bolt; 5. first sealing plate; 6. second sealing plate; 7. welding wire head; 8. exhaust valve. DETAILED DESCRIPTION

[0024] In order to make the technical personnel in the technical field to which the present application belongs to understand the present application more clearly, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0025] See also Figure 1 and Figure 2 ;

[0026] Figure 1 is a structural schematic diagram of a sealing device in an embodiment of the present application, Figure 2 Schematic diagram of a valve that needs to be repaired in an embodiment of the present application; Figure 2 As shown, the air-leaking flange 2 is arranged on the medium pipeline 1 of the valve, and stud bolts 4 are arranged at the upper and lower ends of the flange 2, and a sealing gasket 3 is arranged in the middle. Figure 1 As shown, the device is used to seal a large valve with a flange 2 leaking. The sealing device includes: a plurality of first sealing plates 5, which are arranged in an annular manner around the arc surface of the flange 2; a plurality of second sealing plates 6, one end of each of the plurality of second sealing plates 6 is respectively connected to the two ends of the first sealing plate 5, and the other end of each of the plurality of second sealing plates 6 is welded to the valve. The first sealing plate 5 and the second sealing plate 6 wrap the flange 2 port that cannot be stopped for gas treatment to form a closed space; and an exhaust assembly is installed on any of the first sealing plates 5. The flange 2 with a leak is sealed by splicing the first sealing plate 5 and the second sealing plate 6 on the outside of the flange 2 port that cannot be stopped for gas treatment. After the air tightness of the seal is detected by the exhaust assembly, the flange 2 can be isolated and sealed without stopping the work; the energy and economic losses caused by equipment isolation or shutdown are reduced; and the hidden dangers of equipment failure caused by leakage are effectively eliminated.

[0027] See also Figure 1 and Figure 3 , Figure 3 It is a schematic structural diagram of the first sealing plate 5 in the embodiment of the present application.

[0028] In some embodiments, the first sealing plate 5 is an arc plate, and a plurality of the first sealing plates 5 are spliced ​​on the outer circle of the flange 2 to form a ring.

[0029] See also Figure 1 and Figure 4 , Figure 4 It is a schematic diagram of the structure of the second sealing plate 6 in the embodiment of the present application.

[0030] In some embodiments, the second sealing plate 6 is a vertical plate, and the longitudinal cross-section of the second sealing plate 6 is fan-shaped.

[0031] In some embodiments, the exhaust assembly includes: a welding wire head 7 , a mounting hole is processed on any one of the first sealing plates 5 , and the welding wire head 7 is fixed to the mounting hole; and an exhaust valve 8 , which is installed on the welding wire head 7 .

[0032] In some embodiments, the exhaust valve 8 is a DN15-DN50 ball valve.

[0033] In some embodiments, the first sealing plate 5 is made of steel plate.

[0034] In some embodiments, the second sealing plate 6 is made of steel plate.

[0035] In some embodiments, the thickness of the first sealing plate 5 is 10 mm to 12 mm.

[0036] In some embodiments, the thickness of the second sealing plate 6 is 10 mm to 12 mm.

[0037] In some embodiments, when the flange 2 leaks, several first sealing plates 5 and second sealing plates 6 are prefabricated according to the specific conditions of the leakage part of the flange 2. The first sealing plates 5 and the first sealing plates 5 and the connection parts of the first sealing plates 5 and the second sealing plates 6 are welded by electric welding, so that the first sealing plates 5 and the second sealing plates 6 can surround the leakage part of the flange 2 in a whole circle after being spliced. A circular hole is cut on one of the first sealing plates 5, and the unthreaded end of the welding wire head 7 is welded to the circular hole. At the same time, an exhaust valve 8 is installed on the threaded end of the wire head. During the welding operation, the exhaust ball valve is opened to discharge the gas at the leakage part of the flange 2 through the exhaust valve. When all welding operations are completed, the exhaust ball valve is closed, and all weld parts are checked for leaks with soapy water. If there is still leakage, the exhaust valve is opened, and the pressure is relieved and then the welding is repaired. This is repeated until there is no gas leakage.

[0038] A second aspect of this embodiment provides a large valve, wherein the sealing device is installed at the flange 2 of the valve where the gas cannot be stopped.

[0039] It can be seen from the above technical solution that the present application has at least the following advantages and positive effects:

[0040] The sealing device in the present application forms a sealed space by splicing a first sealing plate and a second sealing plate on the outer side of the flange opening where gas cannot be stopped, thereby sealing the leaking flange, and testing the air tightness of the seal through an exhaust assembly. The flange can be isolated and sealed without stopping work, thereby reducing energy and economic losses caused by equipment isolation or shutdown, and effectively eliminating the hidden dangers of equipment failure caused by leakage.

[0041] A large valve in the present application is provided with a sealing device, and a sealing space is formed by splicing a first sealing plate and a second sealing plate on the outside of a flange opening where gas cannot be stopped, so as to seal a leaking flange, and the air tightness of the seal is tested by an exhaust assembly, so that the flange can be isolated and sealed without stopping work; thus reducing energy and economic losses caused by equipment isolation or shutdown; and effectively eliminating the hidden dangers of equipment failure caused by leakage.

[0042] Unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0043] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0044] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0046] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A sealing device for sealing a large valve with flange leakage, characterized in that: The sealing device comprises: A plurality of first sealing plates are arranged in an annular manner around the arc surface of the flange; A plurality of second sealing plates, one end of each of the plurality of second sealing plates is connected to both ends of the first sealing plate respectively, the other end of each of the plurality of second sealing plates is welded to the valve, and the first sealing plate and the second sealing plate wrap the flange opening that cannot be stopped for gas treatment to form a closed space; The exhaust assembly is installed on any one of the first sealing plates.

2. The sealing device according to claim 1, characterized in that: The first sealing plate is an arc plate, and a plurality of the first sealing plates are spliced ​​on the outer ring of the flange to form a ring.

3. The sealing device according to claim 1, characterized in that: The second sealing plate is a vertical plate, and a longitudinal section of the second sealing plate is fan-shaped.

4. The sealing device according to claim 1, characterized in that: The exhaust assembly comprises: A welding wire head is formed by processing a mounting hole on any one of the first sealing plates, and the welding wire head is fixed to the mounting hole; An exhaust valve is installed on the welding wire head.

5. The sealing device according to claim 4, characterized in that: The exhaust valve is a DN15-DN50 ball valve.

6. The sealing device according to claim 2, characterized in that: The first sealing plate is made of steel plate.

7. The sealing device according to claim 3, characterized in that: The second sealing plate is made of steel plate.

8. The sealing device according to claim 2, characterized in that: The thickness of the first sealing plate is 10 mm to 12 mm.

9. The sealing device according to claim 3, characterized in that: The thickness of the second sealing plate is 10 mm to 12 mm.

10. A large valve, characterized in that: A sealing device as claimed in any one of claims 1 to 9 is installed at the flange of the valve where gas cannot be stopped.

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