Pressure self-tightening middle flange high-temperature leakproof sealing structure

Abstract

The utility model relates to the technical field of flange sealing structures, in particular to a pressure self-tightening type middle flange high-temperature leakproof sealing structure which comprises a lower flange and an upper flange, the lower flange and the upper flange are connected through a fixing assembly, and a sealing assembly is arranged between the lower flange and the upper flange. The lower flange comprises an arc-shaped first bearing face facing the upper flange, a sealing piece is arranged in the middle of the lower flange and comprises a first pressure-bearing face facing the first bearing face and a second pressure-bearing face facing the upper flange, a first sealing groove is formed in the middle of the first pressure-bearing face, and a second sealing groove is formed in the middle of the second pressure-bearing face. An auxiliary sealing ring is connected to the middle of the first sealing groove in a clamped mode, a main sealing ring is connected to the middle of the second sealing groove in a clamped mode, through the arrangement of the sealing pieces and the sealing assemblies, during use, the sealing pieces achieve self-tightening sealing through pressure, sealing treatment is conducted on the flange connecting position through mutual cooperation of the sealing assemblies, and therefore the sealing reliability and stability are greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of flange sealing structure technology, specifically to a pressure self-tightening type high-temperature leak-proof sealing structure for middle flanges. Background Technology

[0002] A flange, also called a flange plate or flange, is a part used to connect shafts to each other, and is used for connecting pipe ends; flanges are also used on equipment inlets and outlets for connecting two pieces of equipment, such as speed reducer flanges. A flange connection or flange joint refers to a detachable connection consisting of a flange, gasket, and bolts connected together as a combined sealing structure.

[0003] In industries such as petrochemicals and power, flange connections are widely used in pipelines and equipment. Under high temperature and high pressure, traditional flange sealing structures rely mainly on bolt preload to achieve sealing. However, as equipment operating time increases, high temperatures cause creep and aging of the sealing material, and bolts also experience a decrease in preload due to thermal expansion and contraction and loosening. This leads to reduced sealing performance and leakage problems. Once a leak occurs, it can not only cause loss of media but also potentially trigger safety accidents such as fires, explosions, and leaks of toxic and harmful media, posing a serious threat to production safety and the environment.

[0004] Currently available improved sealing structures are either complex in structure, have high manufacturing costs, and are inconvenient to install and maintain; or they offer only limited improvement in sealing performance and cannot meet the requirements for long-term stable operation. Utility Model Content

[0005] To address the aforementioned shortcomings of existing technologies, this invention provides a pressure-self-tightening high-temperature leak-proof sealing structure for a middle flange, which effectively solves the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] This utility model provides a pressure self-tightening type high-temperature leak-proof sealing structure for a middle flange, including: a lower flange and an upper flange, which are connected by a fixing component. A sealing component is provided between the lower flange and the upper flange. The lower flange includes an arc-shaped first receiving surface facing the upper flange. A sealing element is provided in the middle of the lower flange. The sealing element includes a first pressure-bearing surface facing the first receiving surface and a second pressure-bearing surface facing the upper flange. A first sealing groove is formed in the middle of the first pressure-bearing surface, and a second sealing groove is formed in the middle of the second pressure-bearing surface. A secondary sealing ring is engaged in the middle of the first sealing groove, and a main sealing ring is engaged in the middle of the second sealing groove.

[0008] Furthermore, the first receiving surface and the first pressure bearing surface abut against each other, the cross-section of the first sealing groove is "C" shaped, the cross-section of the second sealing groove is trapezoidal, and the shape of the secondary sealing ring matches the first sealing groove.

[0009] Furthermore, the upper flange includes a second bearing surface facing the lower flange, the second bearing surface and the second pressure bearing surface abut against each other, and a third sealing groove is provided in the middle of the second bearing surface. The shape of the third sealing groove is the same as that of the second sealing groove, and the shape of the main sealing ring matches the second sealing groove and the third sealing groove.

[0010] Furthermore, a water outlet pipe is fixedly connected to the bottom of the lower flange, and a water inlet pipe is fixedly connected to the top of the upper flange. The diameter of the water inlet pipe is slightly smaller than that of the water outlet pipe.

[0011] Furthermore, the sealing assembly includes a first sealing half-ring and a second sealing half-ring, and a connection area is provided at the connection between the first sealing half-ring and the second sealing half-ring, and the connection area adopts a labyrinth splicing.

[0012] Furthermore, the fixing component includes a fixing bolt, a disc spring is sleeved on the surface of the fixing bolt, and a fixing nut is threaded onto the top of the fixing bolt.

[0013] Furthermore, the surface of the lower flange is evenly provided with several first through holes, the surface of the upper flange is evenly provided with several second through holes, and the surfaces of the first sealing half ring and the second sealing half ring are evenly provided with several third through holes. The fixing bolts pass through the first through holes, the third through holes and the second through holes in sequence.

[0014] The technical solution provided by this utility model has the following advantages compared with the known prior art:

[0015] 1. Through the setting of sealing elements and sealing components, the sealing elements achieve self-tightening sealing through pressure during use. Compared with the traditional sealing method that relies on bolt preload, even if the fixing bolts loosen to a certain extent under high temperature conditions, they can still maintain a good sealing effect by relying on internal pressure. The sealing components work together to seal the flange connection, thereby greatly improving the reliability and stability of the seal.

[0016] 2. With the setting of main sealing ring and secondary sealing ring, both the main sealing ring and secondary sealing ring are made of flexible graphite material, which has good high temperature resistance, corrosion resistance and flexibility, and can adapt to the sealing requirements in high temperature environment. The sealing ring and sealing groove achieve self-tightening sealing through pressure, which not only enhances the sealing effect, but also protects and limits the sealing ring, and extends the service life of the sealing structure.

[0017] 3. By using disc springs, when the medium pressure increases, the upper and lower flanges are subjected to outward thrust, which causes the fixing bolts to be subjected to tensile force. When the disc springs are compressed, they will generate a reaction force. This reaction force increases with the increase of the tensile force of the fixing bolts, thereby increasing the clamping force on the sealing ring and realizing the pressure self-tightening function, thus improving the sealing stability. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the overall cross-sectional structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the lower flange structure of this utility model;

[0022] Figure 4 This is a schematic diagram of the sealing component structure of this utility model;

[0023] Figure 5 This is a schematic diagram of the upper flange structure of this utility model;

[0024] Figure 6 This is a schematic diagram of the sealing component structure of this utility model;

[0025] Figure 7 This is a schematic diagram of the fixing component structure of this utility model.

[0026] The labels in the diagram represent:

[0027] 1. Lower flange; 101. Outlet pipe; 102. First bearing surface; 103. First through hole; 2. Sealing element; 201. First pressure bearing surface; 202. Second pressure bearing surface; 203. First sealing groove; 204. Second sealing groove; 205. Secondary sealing ring; 206. Main sealing ring; 3. Upper flange; 301. Second bearing surface; 302. Third sealing groove; 303. Second through hole; 304. Inlet pipe; 4. Sealing assembly; 401. First sealing half ring; 402. Second sealing half ring; 403. Connection area; 404. Third through hole; 5. Fixing assembly; 501. Fixing bolt; 502. Disc spring; 503. Fixing nut. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0029] The present invention will be further described below with reference to the embodiments.

[0030] Example 1:

[0031] Reference Figure 1-7 This first embodiment of the present invention discloses a pressure self-tightening type high-temperature leak-proof sealing structure for a middle flange, comprising: a lower flange 1 and an upper flange 3, which are connected by a fixing component 5. A sealing component 4 is provided between the lower flange 1 and the upper flange 3. The lower flange 1 includes an arc-shaped first receiving surface 102 facing the upper flange 3. A sealing element 2 is provided in the middle of the lower flange 1. The sealing element 2 includes a first pressure-bearing surface 201 facing the first receiving surface 102 and a second pressure-bearing surface 202 facing the upper flange 3. A first sealing groove 203 is provided in the middle of the first pressure-bearing surface 201, and a second sealing groove 204 is provided in the middle of the second pressure-bearing surface 202. A secondary sealing ring 205 is engaged in the middle of the first sealing groove 203, and a main sealing ring 206 is engaged in the middle of the second sealing groove 204.

[0032] With the setting of seal 2 and sealing assembly 4, seal 2 achieves self-tightening sealing through pressure during use. Compared with the traditional sealing method that relies on bolt preload, even if the fixing bolt 501 loosens to a certain extent under high temperature conditions, it can still maintain a good sealing effect by relying on internal pressure. The sealing assembly 4 works together to seal the flange connection, thereby greatly improving the reliability and stability of the seal.

[0033] Example 2:

[0034] Reference Figure 1-7 This is the second embodiment of the present invention, which differs from the first embodiment in that:

[0035] The first bearing surface 102 and the first pressure bearing surface 201 abut against each other. The cross-section of the first sealing groove 203 is "C" shaped, and the cross-section of the second sealing groove 204 is trapezoidal. The shape of the secondary sealing ring 205 matches the shape of the first sealing groove 203. The upper flange 3 includes a second bearing surface 301 facing the lower flange 1. The second bearing surface 301 and the second pressure bearing surface 202 abut against each other. A third sealing groove 302 is provided in the middle of the second bearing surface 301. The shape of the third sealing groove 302 is the same as the shape of the second sealing groove 204. The shape of the main sealing ring 206 matches the shape of the second sealing groove 204 and the third sealing groove 302. The bottom end of the lower flange 1 is fixedly connected to the water outlet pipe 101, and the top end of the upper flange 3 is fixedly connected to the water inlet pipe 304. The diameter of the water inlet pipe 304 is slightly smaller than the diameter of the water outlet pipe 101.

[0036] With the main sealing ring 206 and the secondary sealing ring 205, both the main sealing ring 206 and the secondary sealing ring 205 are made of flexible graphite material, which has good high temperature resistance, corrosion resistance and flexibility, and can adapt to the sealing requirements in high temperature environments. The sealing ring and the sealing groove achieve self-tightening sealing through pressure, which not only enhances the sealing effect, but also protects and limits the sealing ring, and extends the service life of the sealing structure.

[0037] The sealing assembly 4 includes a first sealing half-ring 401 and a second sealing half-ring 402. A connection area 403 is provided at the connection between the first sealing half-ring 401 and the second sealing half-ring 402. The connection area 403 adopts a labyrinth splicing. The fixing assembly 5 includes a fixing bolt 501. A disc spring 502 is sleeved on the surface of the fixing bolt 501. A fixing nut 503 is threaded to the top of the fixing bolt 501. A number of first through holes 103 are evenly opened on the surface of the lower flange 1. A number of second through holes 303 are evenly opened on the surface of the upper flange 3. A number of third through holes 404 are evenly opened on the surfaces of the first sealing half-ring 401 and the second sealing half-ring 402. The fixing bolt 501 passes through the first through hole 103, the third through hole 404 and the second through hole 303 in sequence.

[0038] With the disc spring 502, when the medium pressure increases, the upper flange 3 and the lower flange 1 are subjected to an outward thrust, which causes the fixing bolt 501 to be subjected to a tensile force. When the disc spring 502 is compressed, it will generate a reaction force. This reaction force can increase with the increase of the tensile force of the fixing bolt 501, thereby increasing the clamping force on the sealing ring, realizing the pressure self-tightening function, and thus improving the sealing stability.

[0039] The remaining structure is the same as that in Example 1.

[0040] The workflow of this utility model is as follows:

[0041] First, the secondary sealing ring 205 and the main sealing ring 206 are sequentially snapped into the interiors of the first sealing groove 203 and the second sealing groove 204. Then, the sealing element 2 is snapped into the middle of the lower flange 1. Next, the first sealing half-ring 401 and the second sealing half-ring 402 are spliced ​​together and placed on the top of the lower flange 1, ensuring that the third through hole 404 is aligned with the first through hole 103. The first sealing half-ring 401 and the second sealing half-ring 402 are spliced ​​in a labyrinth pattern. Under high-temperature conditions, the first sealing half-ring 401 and the second sealing half-ring 402 are prone to thermal deformation. The gap of the labyrinth design can accommodate... The difference in thermal expansion avoids sealing failure, and the labyrinth splicing method increases the contact area of ​​the connection area 403, preventing leakage. With the setting of sealing element 2 and sealing assembly 4, sealing element 2 achieves self-tightening sealing through pressure during use. Compared with the traditional sealing method that relies on bolt pre-tightening force, even if the fixing bolt 501 loosens to a certain extent under high temperature conditions, it can still maintain a good sealing effect by relying on internal pressure. The sealing assembly 4 works together to seal the flange connection, thereby greatly improving the reliability and stability of the seal.

[0042] Secondly, with the setting of the main sealing ring 206 and the secondary sealing ring 205, both the main sealing ring 206 and the secondary sealing ring 205 are made of flexible graphite material, which has good high temperature resistance, corrosion resistance and flexibility, and can adapt to the sealing requirements in high temperature environment. The sealing ring and the sealing groove achieve self-tightening sealing through pressure, which not only enhances the sealing effect, but also protects and limits the sealing ring, and extends the service life of the sealing structure.

[0043] Finally, place the upper flange 3 on top of the lower flange 1, ensuring that the third sealing groove 302 is aligned with the main sealing ring 206 and the second through hole 303 is aligned with the third through hole 404. Then, pass the fixing bolt 501 through the through hole, and then fit the disc spring 502 onto the surface of the fixing bolt 501. Finally, tighten the fixing nut 503 onto the fixing bolt 501. With the setting of the disc spring 502, when the medium pressure increases, the upper flange 3 and the lower flange 1 are subjected to an outward thrust, causing the fixing bolt 501 to be subjected to a tensile force. When the disc spring 502 is compressed, it will generate a reaction force. This reaction force can increase with the increase of the tensile force of the fixing bolt 501, thereby increasing the clamping force on the sealing ring and realizing the pressure self-tightening function, thereby improving the sealing stability.

[0044] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this utility model.

Claims

1. A pressure-self-tightening high-temperature leak-proof sealing structure for a middle flange, characterized in that, include: A lower flange (1) and an upper flange (3) are connected by a fixing component (5). A sealing component (4) is provided between the lower flange (1) and the upper flange (3). The lower flange (1) includes an arc-shaped first receiving surface (102) facing the upper flange (3). A sealing element (2) is provided in the middle of the lower flange (1). The sealing element (2) includes a first pressure-bearing surface (201) facing the first receiving surface (102) and a second pressure-bearing surface (202) facing the upper flange (3). A first sealing groove (203) is provided in the middle of the first pressure-bearing surface (201), and a second sealing groove (204) is provided in the middle of the second pressure-bearing surface (202). A secondary sealing ring (205) is engaged in the middle of the first sealing groove (203), and a main sealing ring (206) is engaged in the middle of the second sealing groove (204).

2. The pressure self-tightening type high-temperature leak-proof sealing structure for a flange according to claim 1, characterized in that, The first receiving surface (102) and the first pressure bearing surface (201) abut against each other. The cross-section of the first sealing groove (203) is "C" shaped, the cross-section of the second sealing groove (204) is trapezoidal, and the shape of the secondary sealing ring (205) matches the first sealing groove (203).

3. The pressure self-tightening type high-temperature leak-proof sealing structure for a flange according to claim 2, characterized in that, The upper flange (3) includes a second receiving surface (301) facing the lower flange (1), the second receiving surface (301) and the second pressure bearing surface (202) abut against each other, and a third sealing groove (302) is provided in the middle of the second receiving surface (301). The shape of the third sealing groove (302) is the same as the shape of the second sealing groove (204), and the shape of the main sealing ring (206) matches the second sealing groove (204) and the third sealing groove (302).

4. The pressure self-tightening type high-temperature leak-proof sealing structure for a flange according to claim 1, characterized in that, The bottom end of the lower flange (1) is fixedly connected to a water outlet pipe (101), and the top end of the upper flange (3) is fixedly connected to a water inlet pipe (304). The diameter of the water inlet pipe (304) is slightly smaller than that of the water outlet pipe (101).

5. The pressure self-tightening type high-temperature leak-proof sealing structure for a flange according to claim 1, characterized in that, The sealing assembly (4) includes a first sealing half ring (401) and a second sealing half ring (402). A connection area (403) is provided at the connection between the first sealing half ring (401) and the second sealing half ring (402). The connection area (403) is constructed using a maze splicing method.

6. The pressure self-tightening type high-temperature leak-proof sealing structure for a flange according to claim 1, characterized in that, The fixing component (5) includes a fixing bolt (501), a disc spring (502) is sleeved on the surface of the fixing bolt (501), and a fixing nut (503) is threaded to the top of the fixing bolt (501).

7. The pressure self-tightening type high-temperature leak-proof sealing structure for a middle flange according to claim 6, characterized in that, The surface of the lower flange (1) is provided with a plurality of first through holes (103), the surface of the upper flange (3) is provided with a plurality of second through holes (303), the surface of the first sealing half ring (401) and the second sealing half ring (402) is provided with a plurality of third through holes (404), and the fixing bolt (501) passes through the first through hole (103), the third through hole (404) and the second through hole (303) in sequence.

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