A high-precision corrugated composite gasket with good temperature and pressure resistance

Abstract

This invention belongs to the field of sealing gasket technology and discloses a high-precision corrugated composite gasket with good temperature and pressure resistance. It includes an expanded graphite coating layer, with an upper support frame and a lower support frame fixedly installed in the middle of the expanded graphite coating layer. A central sealing frame is fixedly installed in the middle of both the upper and lower support frames. Elastic strip one and elastic strip two are fixedly installed between the bottom surface of the upper support frame and the top surface of the lower support frame. When elastic strip one and elastic strip two deform to their maximum extent, they reach their bending limit. At this point, a clicking sound occurs at the bend of elastic strip one and elastic strip two. Simultaneously, the two magnetic strips contacting each other also produce a collision sound, thus providing an early warning to the operator to reach the maximum load state. This eliminates the need for precise torque control during operation, reducing the operator's workload.

Description

Technical Field

[0001] This invention belongs to the field of sealing gasket technology, specifically a high-precision corrugated composite gasket with good temperature and pressure resistance. Background Technology

[0002] Corrugated composite gaskets are made of a specially constructed metal frame and expanded graphite material. The upper and lower surfaces of the metal frame have concentric grooves of a special shape that are staggered, thus forming a metal frame with good elasticity. The expanded graphite material composited on the metal frame has a labyrinth seal effect because the contact with other sealing surfaces is a line contact of multiple concentric circles. It utilizes the sealing properties of the soft expanded graphite coating layer and the advantages of the metal's strength and elasticity to achieve a better sealing effect. At the same time, it has good high temperature resistance and pressure resistance, and is widely used in flange connections in chemical plants and oil refineries.

[0003] Most existing corrugated composite gaskets consist directly of a metal skeleton and an expanded graphite coating layer laminated to the metal skeleton. In use, the device is placed between two flanges to achieve a forced seal. However, when tightening the two flanges, to ensure the stability of the flange connection, a relatively large clamping force is usually applied between the two flanges using bolts. But when the clamping force applied to the two flanges exceeds the maximum load that the corrugated composite gasket can withstand, the gasket may break, causing the device to lose its original sealing effect. To avoid damage to the corrugated composite gasket, precise control of the bolt torque is usually required when tightening the two flanges, making the operation complex and increasing the workload for operators.

[0004] The existing corrugated composite gaskets have a limited service life. After reaching the end of their service life, the corrugated composite gasket between the two flanges usually needs to be replaced. When removing the corrugated composite gasket between the two flanges, the two flanges need to be disassembled to expose the corrugated composite gasket on one of the flanges. However, due to the complex operating environment of the flanges, the corrugated composite gasket may adhere to the flange surface after long-term use. When removing the corrugated composite gasket, operators need to use tools such as scrapers to remove it, which is inconvenient for removing the device and reduces the labor efficiency of the operators.

[0005] Although existing corrugated composite gaskets are reusable, the high temperature and high pressure working environment inside pipelines inevitably causes aging and failure of the expanded graphite coating layer of the corrugated composite gasket. The labyrinth-type sealing structure causes the expanded graphite coating layer on the surface of the corrugated composite gasket to gradually diffuse from the inside out. When reused, the aged expanded graphite coating layer may cause the sealing effect of the device to deteriorate, reducing the original sealing effect. Summary of the Invention

[0006] The purpose of this invention is to provide a high-precision corrugated composite gasket with good temperature and pressure resistance to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a high-precision corrugated composite gasket with good temperature and pressure resistance, comprising an expanded graphite coating layer, wherein an upper support frame and a lower support frame are fixedly installed in the middle of the expanded graphite coating layer, and a middle sealing frame is fixedly installed in the middle of both the upper and lower support frames. Increasing the distance between the upper and lower support frames allows for contraction at the deformed middle sealing frame, causing the middle sealing frame to contract laterally, thereby enabling the expanded graphite coating layer adhered to the two flanges to produce… The expansion graphite coating layer is horizontally slidable, and after movement, it separates from the surface of the flange. Elastic strip one and elastic strip two are fixedly installed between the bottom surface of the upper support frame and the top surface of the lower support frame. An ejector spring is fixedly installed between the bottom surface of the upper support frame and the top surface of the lower support frame. Magnetic strips are fixedly installed at the top and bottom ends of elastic strip one and elastic strip two. As elastic strip one and elastic strip two deform, the magnetic strips at the top and bottom ends of elastic strip one and elastic strip two gradually approach each other. When elastic strip one and elastic strip two make a clicking sound, the two magnetic strips also make a collision sound when they come into contact with each other. A replacement graphite layer is movably connected to the inner cavity of the expansion graphite coating layer.

[0008] Preferably, the inner wall of the expanded graphite coating layer has a positioning groove, the right end of the positioning groove has an installation hole, the front end of the replacement graphite layer has an installation groove, the left side of the installation groove has an insertion hole, the right side of the installation groove has an insertion block fixedly installed, and the outer wall of the installation groove has a positioning strip fixedly installed. The positioning strip is movably connected in the inner cavity of the positioning groove. The replacement graphite layer is rotated to align the installation groove with the installation hole, and then the replacement graphite layer is squeezed to reduce its length. At this time, the positioning strip connected to one end of the replacement graphite layer is pulled out from the installation hole.

[0009] Preferably, the replacement graphite layer is tightly fitted to the inner wall of the expanded graphite covering layer. The positioning strip is inserted into the positioning groove, and then the replacement graphite layer is gradually moved in the insertion direction until the positioning strip is completely located in the inner cavity of the positioning groove, which can realize the installation of the replacement graphite layer.

[0010] Preferably, the length of the replacement graphite layer is one millimeter greater than the circumference of the inner wall of the expanded graphite cover layer, and the height of the replacement graphite layer is equal to the height of the expanded graphite cover layer. This ensures that the replacement graphite layer can fit tightly against the parts located on both sides of the mounting groove without external pulling force, thus ensuring the sealing of the device.

[0011] Preferably, the upper support frame is located above the lower support frame. The top surface of the upper support frame and the bottom surface of the lower support frame are respectively attached to the top and bottom ends of the expanded graphite covering layer. The expanded graphite covering layer is subjected to the pressure of the flange, which gradually brings the upper and lower support frames closer to each other. When they are close, the upper and lower support frames apply pressure to the elastic strip one and elastic strip two, so that the shapes of the upper and lower ends of the middle sealing frame come into contact with the flange, thereby achieving a seal on the flange.

[0012] Preferably, the first elastic strip is located inside the second elastic strip. The cross-sectional shape of both the first and second elastic strips is arc-shaped. The first and second elastic strips undergo elastic deformation. When the applied pressure reaches the maximum deformation of the first and second elastic strips, the first and second elastic strips are at their bending limit. At this time, the first and second elastic strips make a clicking sound.

[0013] Preferably, the ejector spring is located in the middle of elastic strip one and elastic strip two. The top and bottom ends of the ejector spring are respectively fixedly installed on the bottom surface of the upper support frame and the top surface of the lower support frame. When it is necessary to remove the device from the flange, the two flanges are disassembled. When the pressure applied by the two flanges to the expanded graphite coating layer decreases, the elasticity of the ejector spring in the compressed state and the elastic force of elastic strip one and elastic strip two in the bent state will push the upper support frame and the lower support frame relative to each other.

[0014] Preferably, there are two insertion holes and two insertion blocks. The two insertion holes and two insertion blocks are located on the upper and lower sides of the replacement graphite layer, respectively. The two insertion blocks are inserted into the two insertion holes to stretch the parts of the replacement graphite layer at both ends of the mounting groove, expand the width of the mounting groove, and then insert the insertion blocks into the insertion holes to position and lock the two ends of the replacement graphite layer.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. This invention provides elastic strips one and two between the upper and lower support frames. When tightened, the upper and lower support frames apply pressure to elastic strips one and two. When the applied pressure causes elastic strips one and two to deform to their maximum extent, they reach their bending limit. At this point, a clicking sound is produced at the bending point of elastic strips one and two. Simultaneously, the two magnetic strips come into contact with each other, also producing a collision sound. This serves as a warning to the operator that the maximum load has been reached, eliminating the need for precise torque control during operation and reducing the operator's workload.

[0017] 2. This invention installs an ejector spring between the upper and lower support frames. When the pressure applied to the expanded graphite coating by the two flanges decreases, the elasticity of the ejector spring in its compressed state and the elastic force of the first and second elastic strips in their bent state will push the upper and lower support frames relative to each other. This increases the distance between the upper and lower support frames and causes lateral contraction at the deformed central sealing frame. This allows the expanded graphite coating adhered to the two flanges to slide horizontally, thus automatically separating the device from the flanges, facilitating device removal, and improving the operator's work efficiency.

[0018] 3. This invention stretches the replacement graphite layer at the mounting groove to separate the plug block from the inner cavity of the plug hole, then compresses the replacement graphite layer to reduce its length, and then removes the positioning strip connected to one end of the replacement graphite layer from the mounting hole. The replacement graphite layer can then be pulled out of the inner wall of the expanded graphite cover layer, and the replacement graphite layer can be separated from the expanded graphite cover layer. This allows the replacement graphite layer, which is in direct contact with the working environment, to be removed and replaced individually, thereby restoring the sealing performance of the device. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention;

[0020] Figure 2 This is a cross-sectional schematic diagram of the expanded graphite coating layer of the present invention;

[0021] Figure 3 This is a schematic diagram of the exploded connection of the graphite layer replacement structure in this invention;

[0022] Figure 4 This is a schematic diagram of the exploded connection of the magnetic strips in the structure of the present invention;

[0023] Figure 5 The structure of this invention Figure 3 Enlarged view of point A in the middle;

[0024] Figure 6 The structure of this invention Figure 3 Enlarged view of point B in the middle;

[0025] Figure 7 The structure of this invention Figure 4 Enlarged diagram of point C in the middle.

[0026] In the diagram: 1. Expanded graphite cover layer; 2. Upper support frame; 3. Lower support frame; 4. Middle sealing frame; 5. Elastic strip one; 6. Elastic strip two; 7. Ejection spring; 8. Magnetic strip; 9. Replacement graphite layer; 10. Positioning groove; 11. Mounting hole; 12. Mounting groove; 13. Insertion hole; 14. Insertion block; 15. Positioning strip. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] like Figures 1 to 7 As shown in the embodiment of the present invention, a high-precision corrugated composite gasket with good temperature and pressure resistance includes an expanded graphite cover layer 1. An upper support frame 2 and a lower support frame 3 are fixedly installed in the middle of the expanded graphite cover layer 1. A middle sealing frame 4 is fixedly installed in the middle of both the upper support frame 2 and the lower support frame 3. When the distance between the upper support frame 2 and the lower support frame 3 increases, the deformed middle sealing frame 4 can be contracted. When the middle sealing frame 4 contracts, it drives the expanded graphite cover layer 1 to contract laterally, thereby enabling the expanded graphite cover layer 1, which is adhered to the two flanges, to slide horizontally. After movement, the expanded graphite covering layer 1 is separated from the surface of the flange. Elastic strip 1 5 and elastic strip 2 6 are fixedly installed between the bottom surface of the upper support frame 2 and the top surface of the lower support frame 3. An ejector spring 7 is fixedly installed between the bottom surface of the upper support frame 2 and the top surface of the lower support frame 3. Magnetic strips 8 are fixedly installed at the top and bottom of elastic strip 1 5 and elastic strip 2 6. As elastic strip 1 5 and elastic strip 2 6 deform, the magnetic strips 8 at the top and bottom ends of elastic strip 1 5 and elastic strip 2 6 gradually approach each other. When elastic strip 1 5 and elastic strip 2 6 make a clicking sound, the two magnetic strips 8 will also make a collision sound when they come into contact with each other. A replacement graphite layer 9 is movably connected to the inner cavity of the expanded graphite covering layer 1.

[0029] The inner wall of the expanded graphite coating layer 1 has a positioning groove 10, the right end of the positioning groove 10 has a mounting hole 11, the front end of the replacement graphite layer 9 has a mounting groove 12, the left side of the mounting groove 12 has a plug-in hole 13, the right side of the mounting groove 12 has a plug-in block 14 fixedly installed, and the outer wall of the mounting groove 12 has a positioning strip 15 fixedly installed. The positioning strip 15 is movably connected in the inner cavity of the positioning groove 10. The replacement graphite layer 9 is rotated so that the mounting groove 12 is aligned with the mounting hole 11. Then the replacement graphite layer 9 is squeezed to reduce its length. At this time, the positioning strip 15 connected to one end of the replacement graphite layer 9 is pulled out from the mounting hole 11.

[0030] The replacement graphite layer 9 is tightly fitted to the inner wall of the expanded graphite covering layer 1. The positioning strip 15 is inserted into the positioning groove 10, and then the replacement graphite layer 9 is gradually moved in the insertion direction until the positioning strip 15 is completely located in the inner cavity of the positioning groove 10, so that the replacement graphite layer 9 can be installed.

[0031] The length of the replacement graphite layer 9 is one millimeter greater than the circumference of the inner wall of the expanded graphite covering layer 1, and the height of the replacement graphite layer 9 is equal to the height of the expanded graphite covering layer 1. This ensures that the replacement graphite layer 9 can fit tightly against the parts located on both sides of the mounting groove 12 without external pulling force, thus ensuring the sealing of the device.

[0032] The upper support frame 2 is located above the lower support frame 3. The top surface of the upper support frame 2 and the bottom surface of the lower support frame 3 are respectively attached to the top and bottom of the expanded graphite covering layer 1. The expanded graphite covering layer 1 is subjected to the pressure of the flange, which gradually brings the upper support frame 2 and the lower support frame 3 closer to each other. When they are close, the upper support frame 2 and the lower support frame 3 apply pressure to the elastic strip 5 and the elastic strip 6, so that the upper and lower ends of the middle sealing frame 4 come into contact with the flange, thereby achieving a seal on the flange.

[0033] Among them, elastic strip 1 5 is located inside elastic strip 2 6. The cross-sectional shape of elastic strip 1 5 and elastic strip 2 6 is arc-shaped. Elastic strip 1 5 and elastic strip 2 6 undergo elastic deformation. When the applied pressure reaches the maximum deformation of elastic strip 1 5 and elastic strip 2 6, elastic strip 1 5 and elastic strip 2 6 are at the bending limit. At this time, elastic strip 1 5 and elastic strip 2 6 make a popping sound.

[0034] The ejector spring 7 is located in the middle of elastic strip 5 and elastic strip 6. The top and bottom ends of the ejector spring 7 are fixedly installed on the bottom surface of the upper support frame 2 and the top surface of the lower support frame 3, respectively. When the device needs to be removed from the flange, the two flanges are disassembled. When the pressure applied by the two flanges to the expanded graphite coating layer 1 decreases, the elasticity of the ejector spring 7 in the compressed state and the elastic force of elastic strip 5 and elastic strip 6 in the bent state will push the upper support frame 2 and the lower support frame 3 relative to each other.

[0035] There are two insertion holes 13 and two insertion blocks 14. The two insertion holes 13 and the two insertion blocks 14 are located on the upper and lower sides of the replacement graphite layer 9, respectively. The two insertion blocks 14 are inserted into the two insertion holes 13, stretching the parts of the replacement graphite layer 9 at both ends of the mounting groove 12, expanding the width of the mounting groove 12, and then inserting the insertion blocks 14 into the insertion holes 13, thereby positioning and locking the two ends of the replacement graphite layer 9.

[0036] Working principle and usage process of this invention:

[0037] During installation, place the device in the middle of the two flanges, and then tighten the bolts between the two flanges so that the two flanges gradually press the device together.

[0038] During compression, the expanded graphite coating 1 is gradually brought closer to the upper support frame 2 and the lower support frame 3 by the pressure of the flange. As they approach each other, the upper support frame 2 and the lower support frame 3 apply pressure to the elastic strip 5 and the elastic strip 6, causing them to deform elastically. When the applied pressure reaches the maximum deformation of the elastic strip 5 and the elastic strip 6, they are at their bending limit. At this point, the elastic strip 5 and the elastic strip 6 make a clicking sound. At the same time, as the elastic strip 5 and the elastic strip 6 deform, the magnetic strips 8 at the upper and lower ends of the elastic strip 5 and the elastic strip 2 gradually approach each other. When the elastic strip 5 and the elastic strip 2 make a clicking sound, the two magnetic strips 8 also make a collision sound when they come into contact with each other.

[0039] When it is necessary to remove the device from the flange, the two flanges are disassembled. When the pressure applied by the two flanges to the expanded graphite cover 1 decreases, the elasticity of the ejector spring 7 in the compressed state and the elastic force of the elastic strip 5 and the elastic strip 6 in the bent state will push the upper support frame 2 and the lower support frame 3 relative to each other, thereby increasing the distance between the upper support frame 2 and the lower support frame 3. When the distance between the upper support frame 2 and the lower support frame 3 increases, the deformed middle sealing frame 4 can be contracted, so that the middle sealing frame 4 drives the expanded graphite cover 1 to contract laterally when it contracts, thereby enabling the expanded graphite cover 1 that is stuck to the two flanges to slide horizontally. After the movement, the expanded graphite cover 1 is separated from the surface of the flange.

[0040] After removing the device, rotate the replacement graphite layer 9 to align the mounting groove 12 with the mounting hole 11. At this time, the replacement graphite layer 9 can be stretched from the mounting groove 12 to make the plug block 14 leave the inner cavity of the plug hole 13. Then, squeeze the replacement graphite layer 9 to reduce its length. At this time, pull out the positioning strip 15 connected to one end of the replacement graphite layer 9 from the mounting hole 11. Then, pull the replacement graphite layer 9 directly to remove it from the inner wall of the expanded graphite cover layer 1.

[0041] When installing a new replacement graphite layer 9, place the positioning strip 15 at one end of the replacement graphite layer 9 into the mounting hole 11 and align the mounting hole 11 with the positioning groove 10. Move the replacement graphite layer 9 to insert the positioning strip 15 into the positioning groove 10, and then gradually move the replacement graphite layer 9 in the insertion direction until the positioning strip 15 is completely located in the inner cavity of the positioning groove 10. Then stretch the parts of the replacement graphite layer 9 located at both ends of the mounting groove 12 to expand the width of the mounting groove 12. Then insert the plug block 14 into the plug hole 13 to position both ends of the replacement graphite layer 9, thus realizing the installation of the replacement graphite layer 9.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-precision corrugated composite gasket with good temperature and pressure resistance, comprising an expanded graphite coating layer (1), characterized in that: An upper support frame (2) and a lower support frame (3) are fixedly installed in the middle of the expanded graphite covering layer (1). A middle sealing frame (4) is fixedly installed in the middle of both the upper support frame (2) and the lower support frame (3). An elastic strip one (5) and an elastic strip two (6) are fixedly installed between the bottom surface of the upper support frame (2) and the top surface of the lower support frame (3). An ejection spring (7) is fixedly installed between the bottom surface of the upper support frame (2) and the top surface of the lower support frame (3). Magnetic strips (8) are fixedly installed at the top and bottom ends of the elastic strip one (5) and the elastic strip two (6). A replacement graphite layer (9) is movably connected to the inner cavity of the expanded graphite covering layer (1). The ejection spring (7) is located in the middle of the elastic strip one (5) and the elastic strip two (6). The top and bottom ends of the ejection spring (7) are fixedly installed on the bottom surface of the upper support frame (2) and the top surface of the lower support frame (3), respectively.

2. The high-precision corrugated composite gasket with good temperature and pressure resistance according to claim 1, characterized in that: The inner wall of the expanded graphite coating layer (1) is provided with a positioning groove (10), the right end of the positioning groove (10) is provided with an installation hole (11), the front end of the replacement graphite layer (9) is provided with an installation groove (12), the left side of the installation groove (12) is provided with an insertion hole (13), the right side of the installation groove (12) is fixedly installed with an insertion block (14), the outer wall of the installation groove (12) is fixedly installed with a positioning strip (15), and the positioning strip (15) is movably connected in the inner cavity of the positioning groove (10).

3. The high-precision corrugated composite gasket with good temperature and pressure resistance according to claim 1, characterized in that: The replacement graphite layer (9) is tightly bonded to the inner wall of the expanded graphite covering layer (1).

4. The high-precision corrugated composite gasket with good temperature and pressure resistance according to claim 1, characterized in that: The length of the replacement graphite layer (9) is one millimeter greater than the perimeter of the inner wall of the expanded graphite covering layer (1), and the height of the replacement graphite layer (9) is equal to the height of the expanded graphite covering layer (1).

5. The high-precision corrugated composite gasket with good temperature and pressure resistance according to claim 1, characterized in that: The upper support frame (2) is located above the lower support frame (3), and the top surface of the upper support frame (2) and the bottom surface of the lower support frame (3) are respectively attached to the top and bottom of the expanded graphite covering layer (1).

6. The high-precision corrugated composite gasket with good temperature and pressure resistance according to claim 1, characterized in that: The first elastic strip (5) is located inside the second elastic strip (6), and the cross-sectional shape of both the first elastic strip (5) and the second elastic strip (6) is arc-shaped.

7. The high-precision corrugated composite gasket with good temperature and pressure resistance according to claim 2, characterized in that: There are two insertion holes (13) and two insertion blocks (14). The two insertion holes (13) and two insertion blocks (14) are located on the upper and lower sides of the replacement graphite layer (9), respectively. The two insertion blocks (14) are inserted into the two insertion holes (13).

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