Improved nuclear power emergency diesel engine smoke exhaust pipe sealing structure
By using a combination of graphite spiral wound gaskets and sealing grooves at the flange of the exhaust pipe of the diesel engine in the nuclear power plant, the problem of poor sealing was solved, the exhaust pipe was effectively sealed, and the risk of smoke leakage and maintenance workload were reduced.
Patent Information
- Application Number
- CN202520466492.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-17
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2035-03-17
AI Technical Summary
In existing technologies, the diesel engine exhaust pipes in nuclear power plants often have poor sealing at the flange connections, leading to smoke leakage, which affects plant safety and increases maintenance workload.
The system employs a combination structure of graphite spiral wound gasket and sealing groove, utilizing the non-planar layered structure and compressibility of the graphite and metal layers for sealing. It is then fixed with clamp components to achieve sealing performance. The clamp components are used to fix and connect the exhaust pipe flange and the bellows flange.
It effectively avoids smoke leakage from the exhaust pipe, improves sealing performance, reduces the risk of smoke leakage in the factory, and reduces maintenance workload.
Smart Images
Figure CN223707758U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to sealing technical field especially relates to an improved nuclear power emergency diesel engine exhaust pipe sealing structure. BACKGROUND
[0002] The diesel engine of nuclear power station may appear smoke leakage when cold starting because of insufficient combustion, and the sections of diesel engine exhaust pipe are connected through flanges, but the flange connection part of exhaust pipe may appear poor sealing and smoke leakage after long time use, so toothed corrugated metal gasket is added to seal the flange connection part, but the toothed corrugated metal gasket may be broken after long time friction, and then smoke leakage occurs, the smoke may leak to other places and cause fire alarm in the plant, and the work load of on-site maintenance is increased. SUMMARY
[0003] The utility model provides a nuclear power unit pressure regulator interval flaw shielding structure.
[0004] The utility model provides a improved nuclear power emergency diesel engine exhaust pipe sealing structure, including: with the diesel engine exhaust pipe connection's exhaust pipe flange, with the bellows pipe connection's bellows pipe flange, set up in the bellows pipe flange abutment's end face and / or set up in exhaust pipe flange abutment's end face on sealing recess, set up in the sealing recess's graphite winding gasket and with exhaust pipe flange Bellows pipe flange fixed connection's clamp assembly, wherein, the graphite winding gasket includes several layers of graphite layer and several layers of metal layer, several graphite layer and metal layer are sequentially spaced stack and press into the overall structure, the graphite layer and the metal layer are non-planar layered structure.
[0005] In some embodiments, the metal layer protrudes in the middle part towards the direction away from the center of the bellows flange, and the shape of the graphite layer matches the shape of the metal layer.
[0006] In some embodiments, the protrusion in the middle part of the metal layer is in the shape of an acute angle.
[0007] In some embodiments, the protrusion in the middle part of the metal layer is in the shape of an arc or a boss.
[0008] In some embodiments, the sealing groove is in the shape of a circular ring, and the shape of the graphite winding gasket matches the shape of the sealing groove.
[0009] In some embodiments, the thickness of the graphite winding gasket is greater than the depth of the sealing groove.
[0010] In some embodiments, the sealing groove is rectangular in size and cross-sectional shape.
[0011] In some embodiments, the graphite winding gasket is rectangular in cross-sectional shape near one end close to the center of the bellows flange, and is convex semicircular in shape away from the center of the bellows flange.
[0012] In some embodiments, the exhaust pipe flange is provided with an exhaust flange plate protruding from the exhaust pipe, the bellows flange is provided with a bellows flange plate protruding from the bellows, and the clamp assembly includes a fixing member clamped around the exhaust flange plate and the bellows flange plate, and connecting members arranged at both ends of the fixing member.
[0013] In some embodiments, the fixing member is provided with threaded holes at both ends, and the connecting member is a bolt passing through the threaded holes.
[0014] The improved nuclear power emergency diesel exhaust pipe sealing structure has the following beneficial effects: a sealing groove is arranged at the abutting surface of the bellows flange, and a graphite winding gasket is embedded, and the compressibility of the graphite winding gasket is used for sealing, which can ensure the sealing performance of the exhaust pipe structure and avoid smoke leakage. BRIEF DESCRIPTION OF DRAWINGS
[0015] In order to more clearly illustrate the technical scheme of the present application, the following will further illustrate the present application in conjunction with the drawings and embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor. In the drawings:
[0016] Figure 1 is a full cross-sectional view of an improved nuclear power emergency diesel exhaust pipe sealing structure in an embodiment of the present application;
[0017] Figure 2 is a top view of a graphite winding gasket of an improved nuclear power emergency diesel exhaust pipe sealing structure in an embodiment of the present application;
[0018] Figure 3 is Figure 2 is a partial cross-sectional view of A-A in
[0019] Figure 4 is a clamp assembly structure diagram of an improved nuclear power emergency diesel exhaust pipe sealing structure in an embodiment of the present application;
[0020] Figure 5It is the sealing groove enlarged view of the improved nuclear power emergency diesel engine exhaust pipe sealing structure in an embodiment of the utility model.
[0021] Reference signs
[0022] 100, exhaust pipe flange;110, exhaust flange;200, corrugated pipe flange;210, corrugated flange;300, clamp assembly;301, fixing piece;302, connecting piece;400, graphite winding gasket;401, metal layer;402, graphite layer;410, sealing groove. DETAILED DESCRIPTION
[0023] In order to have a clearer understanding of the technical features, objects and effects of the utility model, the specific embodiments of the utility model will be described in detail with reference to the drawings. In the following description, it should be understood that the orientation or position relationship indicated by "upper", "inner", "outer", etc. is based on the orientation or position relationship shown in the drawings, and is constructed and operated in a particular orientation, and is only for the convenience of describing the technical scheme, and does not indicate that the device or element indicated must have a particular orientation, so it cannot be understood as a limitation on the utility model.
[0024] It should also be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "fixing", "setting", etc. should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated;It can be mechanically connected, or it can be electrically connected;It can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship of two elements. When an element is referred to as "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there can be one or more intermediate elements. The terms "first", "second", "third", etc. are only for the convenience of describing the technical scheme, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features, therefore, the features with "first", "second", "third", etc. can explicitly or implicitly include one or more of the features. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0025] Figures 1 to 5The improved nuclear power emergency diesel engine exhaust pipe sealing structure shown in an embodiment of the utility model can be used for diesel engine pipeline sealing, which can include an exhaust pipe flange 100 connected with a diesel engine exhaust pipe, a corrugated pipe flange 200 connected with a corrugated pipe, a sealing groove 410 arranged on the end face of the corrugated pipe flange 200 and / or the end face of the exhaust pipe flange 100, a graphite winding gasket 400 arranged in the sealing groove 410, and a clamp assembly 300 for fixedly connecting the exhaust pipe flange 100 and the corrugated pipe flange 200; wherein the graphite winding gasket 400 includes a plurality of graphite layers 402 and a plurality of metal layers 401, the plurality of graphite layers 402 and the plurality of metal layers 401 are sequentially and spaced stacked and pressed into an integral structure, and the graphite layers 402 and the metal layers 401 are non-planar layered structures. The sealing groove 410 is arranged at the abutting surface of the corrugated pipe flange 200, the graphite winding gasket 400 is embedded, and the compressibility of the graphite winding gasket 400 is used for sealing, so that the sealing performance of the exhaust pipe structure can be ensured, and smoke leakage can be avoided.
[0026] It can be understood that the non-planar layered structure of the metal layer 401 and the graphite layer 402 means that each layer is not composed of a plane, and the layered structure of each layer is an irregular shape or a regular shape with certain concave-convex deformation.
[0027] In a specific embodiment, the metal layer 401 is a stainless steel layer.
[0028] In a specific embodiment, the metal layer 401 is a 316 stainless steel layer.
[0029] In a specific embodiment, the sealing groove 410 can be arranged on the end face of the corrugated pipe flange 200, or on the exhaust pipe flange 100, or both the corrugated pipe flange 200 and the exhaust pipe flange 100 are provided with the sealing groove 410.
[0030] It can be understood that the corrugated pipe has scalability and can be elongated or shortened within a certain range to match the actual pipeline allowance.
[0031] In a specific embodiment, the corrugated pipe and the corrugated pipe flange 200 are connected by full welding, leaving no gap and reducing smoke leakage.
[0032] Figure 3The metal layer 401 in an embodiment can include a protrusion in the middle of the metal layer 401 away from the center of the corrugated flange 200, and the graphite layer 402 is shaped to match the metal layer 401. The metal layer 401 is convex in shape, when under pressure, the two ends are pressed and moved towards the middle, and the middle continues to extend away from the center of the flange, forming an elastic structure. The gasket is wrapped by multiple layers of 316L stainless steel graphite, which uses the flexibility of graphite to adhere to the metal flange sealing surface under a certain tightening pressure. The metal layer 401 rebounds to form a sealing layer.
[0033] Figure 3 The graphite layer 402 in an embodiment can include a protrusion in the middle of the metal layer 401 in the shape of an acute angle, forming a triangular shape. When the pressure directly on the two ends of the metal layer 401 becomes a vertical extrusion force, the two ends are extruded inward, and the triangular shape of the metal layer 401 forms a structure with the maximum resilience, so that the graphite winding gasket 400 can form a structure with high resilience to form a sealing layer.
[0034] It can be understood that the triangular protrusion is beneficial for molding and pressing processing, reducing costs.
[0035] Figure 1 And Figure 3 The graphite winding gasket 400 in an embodiment can include a protrusion in the middle of the metal layer in the shape of an arc or a convex platform. When the pressure directly on the two ends of the metal layer 401 becomes a vertical extrusion force, the two ends are extruded inward, and the arc structure or convex platform structure of the metal layer 401 forms a structure with the maximum resilience, so that the graphite winding gasket 400 can form a structure with high resilience to form a sealing layer.
[0036] Figure 1 And Figure 3 The sealing groove 410 in an embodiment can include a circular ring-shaped sealing groove 410, and the graphite winding gasket 400 is shaped to match the shape of the sealing groove 410. Because the corrugated flange 200 and the exhaust flange 100 are circular in shape, the circular ring-shaped sealing groove 410 can fit the shape of the corrugated flange 200 and the exhaust flange 100, forming a good sealing surface, and the circular force is uniform, when the corrugated flange 200 and the exhaust flange 100 are fitted, a uniform sealing surface can be formed.
[0037] Figure 1 And Figure 3It is shown that the graphite winding gasket 400 in an embodiment can include that the cross-sectional shape of the graphite winding gasket 400 is rectangular at one end close to the center of the corrugated pipe flange 200, and the other end away from the center of the corrugated pipe flange 200 is a convex semicircular shape. The rectangular end face can be fitted to the inner diameter shape of the sealing groove 410, and the semicircular end face can be deformed and extruded away when extruded, forming a more uniform sealing surface.
[0038] Figure 1 And Figure 3 It is shown that the graphite winding gasket 400 in an embodiment can include that the thickness of the graphite winding gasket 400 is greater than the depth of the sealing groove 410. The graphite winding gasket 400 will form a sealing surface after being deformed and compressed under extrusion.
[0039] Figure 1 And Figure 3 It is shown that the sealing groove 410 in an embodiment can include that the size of the sealing groove 410 matches the size of the corrugated pipe, and the cross-sectional shape of the sealing groove 410 is rectangular. The rectangular sealing groove 410 is convenient for processing qualified shape.
[0040] In this embodiment, the size of the sealing groove 410 is preferably 2.9-3.0mm in depth, φ222-φ222.5mm in outer diameter, and φ205.5-φ206mm in inner diameter.
[0041] In this embodiment, the outer diameter of the graphite winding gasket 400 is φ220.8-φ221.2mm, the inner diameter is φ208.8-φ209.2mm, and the thickness size is 3.3-3.7mm.
[0042] It can be understood that the outer diameter of the graphite winding gasket 400 is smaller than the outer diameter of the sealing groove 410, and the inner diameter of the graphite winding gasket 400 is larger than the inner diameter of the sealing groove 410, so that the graphite winding gasket 400 can be easily put into the sealing groove 410.
[0043] In a specific embodiment, the thickness of the graphite winding gasket 400 is greater than or equal to 0.6mm more than the thickness of the sealing groove 410.
[0044] Figure 1 And Figure 4The clamp assembly 300 can include the exhaust pipe flange 100 provided with an exhaust flange disc 110 protruding from the exhaust pipe, the corrugated pipe flange 200 provided with a corrugated flange disc 210 protruding from the corrugated pipe, the clamp assembly 300 including a fixing member 301 clamped around the exhaust flange disc 110 and the corrugated flange disc 210, and a connecting member 302 arranged at both ends of the fixing member 301, the corrugated flange disc 210 and the exhaust flange disc 110 being disc-shaped, the corrugated flange disc 210 and the exhaust flange disc 110 having the same outer diameter, and the clamp assembly 300 clamping and fixing the outer circles of the corrugated flange disc 210 and the exhaust flange disc 110.
[0045] Figure 1 and Figure 4 The clamp assembly 300 can include threaded holes arranged at both ends of the fixing member 301, and the connecting member 302 being a bolt, the bolt being arranged through the threaded holes, and the bolt fixing both ends of the clamp assembly 300, so that the exhaust flange disc 110 and the corrugated flange disc 210 are locked.
[0046] In a specific embodiment, the locking force of the bolt is at least 35 N*m (Newton-meter).
[0047] It can be understood that the above embodiments only express the preferred embodiments of the present application, the description is more specific and detailed, but it cannot be understood as the limitation of the patent scope of the present application; it should be pointed out that for ordinary skilled in the art, the above technical features can be freely combined without departing from the concept of the present application, and some deformations and improvements can be made, which belong to the protection scope of the present application; therefore, any equivalent transformation and modification within the scope of the claims of the present application should belong to the scope of the claims of the present application.
Claims
1. An improved sealing structure for the exhaust pipe of a nuclear power emergency diesel engine, characterized in that, include: The exhaust pipe flange (100) connected to the diesel engine exhaust pipe, the bellows flange (200) connected to the bellows, the sealing groove (410) provided on the end face of the bellows flange (200) and / or provided on the end face of the exhaust pipe flange (100) abutting, the graphite spiral wound gasket (400) provided in the sealing groove (410), and the clamp assembly (300) that fixes the exhaust pipe flange (100) and the bellows flange (200) together; The graphite wound gasket (400) includes several graphite layers (402) and several metal layers (401). The graphite layers (402) and the metal layers (401) are stacked and pressed in sequence at intervals to form an integral structure. The graphite layers (402) and the metal layers (401) are non-planar layered structures.
2. The improved sealing structure for the exhaust pipe of a nuclear power emergency diesel engine according to claim 1, characterized in that, The metal layer (401) protrudes in the middle in a direction away from the center of the bellows flange (200), and the graphite layer (402) has a shape that matches the metal layer (401).
3. The improved sealing structure for the exhaust pipe of a nuclear power emergency diesel engine according to claim 2, characterized in that, The metal layer (401) has an acute-angled protrusion in the middle.
4. The improved sealing structure for the exhaust pipe of a nuclear power emergency diesel engine according to claim 2, characterized in that, The central protrusion of the metal layer (401) is arc-shaped or boss-shaped.
5. The improved sealing structure for the exhaust pipe of a nuclear power emergency diesel engine according to claim 1, characterized in that, The sealing groove (410) is annular in shape, and the graphite wound gasket (400) is shaped to match the sealing groove (410).
6. The improved sealing structure for the exhaust pipe of a nuclear power emergency diesel engine according to claim 1, characterized in that, The thickness of the graphite wound gasket (400) is greater than the depth of the sealing groove (410).
7. The improved sealing structure for the exhaust pipe of a nuclear power emergency diesel engine according to claim 1, characterized in that, The dimensions of the sealing groove (410) are matched with the dimensions of the bellows, and the cross-sectional shape of the sealing groove (410) is rectangular.
8. The improved sealing structure for the exhaust pipe of a nuclear power emergency diesel engine according to claim 1, characterized in that, The graphite spiral wound gasket (400) has a rectangular shape at one end near the center of the bellows flange (200), and a raised semi-circular shape at the other end away from the center of the bellows flange (200).
9. The improved sealing structure for the exhaust pipe of a nuclear power emergency diesel engine according to claim 1, characterized in that, The exhaust pipe flange (100) is provided with an exhaust flange plate (110) protruding from the exhaust pipe, the bellows flange (200) is provided with a bellows flange plate (210) protruding from the bellows, and the clamp assembly (300) includes a fastener (301) that is fastened around the exhaust flange plate (110) and the bellows flange plate (210), and a connector (302) provided at both ends of the fastener (301).
10. An improved sealing structure for the exhaust pipe of a nuclear power emergency diesel engine according to claim 9, characterized in that, The fastener (301) has threaded holes at both ends, and the connector (302) is a bolt, which will be inserted through the threaded holes.