Packing type graphite composite sealing gasket

Abstract

The invention relates to a packing type graphite composite sealing gasket, and relates to the technical field of graphite composite gaskets, the packing type graphite composite sealing gasket comprises an inner steel ring, a middle layer and an outer steel ring which are sequentially arranged from inside to outside, the middle layer comprises an annular laminated layer formed by stacking and pressing, the laminated layer comprises a fiber woven net, and a plurality of mounting grooves are formed in the fiber woven net; a soft graphite sheet is arranged in the mounting groove; a tensioning assembly is arranged on the outer steel ring and comprises a first spring arranged on the outer steel ring in a sleeving mode, and the first spring is made of memory alloy which can shrink after being heated. The soft graphite sheets are stacked in the fiber woven net, looseness between the soft graphite sheets can be effectively avoided, through cooperation of the tensioning assembly and the fiber woven net, the fiber woven net can effectively keep the shape stability of the soft graphite sheets, the springback capacity of the gasket in the high-temperature environment can be effectively guaranteed, and the service life of the gasket is prolonged. And meanwhile, the springback capability of the gasket can be further improved along with temperature increase.

Description

Technical Field

[0001] The present application relates to the technical field of graphite composite gaskets, and in particular to a filler-type graphite composite sealing gasket. Background Art

[0002] Sealing gaskets are generally used in machinery, equipment or pipelines. They are a kind of sealing spare parts that are used in places involving fluids. Sealing gaskets can be divided into metal sealing gaskets and non-metallic sealing gaskets according to their materials. The former include copper gaskets, stainless steel gaskets, iron gaskets and aluminum gaskets, etc., and the latter include asbestos gaskets, non-asbestos gaskets, paper gaskets and rubber gaskets, etc.

[0003] In the related art, when the sealing gasket is in a high temperature and high pressure environment for a long time, the graphite composite gasket may experience stress relaxation. As the use time increases, the gasket's rebound ability gradually decreases, and it is unable to effectively maintain the initial preload, resulting in a decrease in the sealing pressure ratio and leakage. Summary of the invention

[0004] In order to improve the resilience of the gasket, the present application provides a filler-type graphite composite sealing gasket.

[0005] The present application provides a filler-type graphite composite sealing gasket adopts the following technical solution: A filler-type graphite composite sealing gasket comprises an inner steel ring, an intermediate layer and an outer steel ring which are sequentially arranged from the inside to the outside, wherein the intermediate layer comprises an annular laminated layer formed by stacking and pressing, the laminated layer comprises a fiber mesh, a plurality of mounting grooves are arranged in the fiber mesh, and soft graphite sheets are arranged in the mounting grooves; a tensioning assembly is arranged on the outer steel ring, the tensioning assembly comprises a first spring which is sleeved on the outer steel ring, and the first spring is a memory alloy which shrinks when heated.

[0006] By adopting the above technical solution, the surface of the soft graphite sheet is wrapped by the fiber mesh, which can effectively avoid the stress relaxation of the soft graphite, and the soft graphite sheets are stacked in the installation groove and then pressed, so that the fiber mesh tightens the soft graphite sheet, thereby improving the resilience of the soft graphite sheet. At the same time, the first spring is sleeved on the outer steel ring, so that the outer steel ring can apply pressure to the middle layer. In addition, the first spring will shrink when working, which can further increase the pressure of the outer steel ring on the middle layer, thereby improving the resilience of the gasket.

[0007] Optionally, opposite sides of two adjacent soft graphite sheets in the fiber mesh are both arranged as ring-shaped wave surfaces, and the ring-shaped wave surfaces on the two adjacent soft graphite sheets are arranged in an interlaced manner and abut against each other.

[0008] By adopting the above technical solution, the interlaced arrangement of the ring wave surfaces on two adjacent soft graphite sheets can effectively increase the resilience of the soft graphite sheets. At the same time, the fiber mesh arranged on the surface of the soft graphite sheet can effectively avoid the deformation of the ring wave surfaces, so that the soft graphite sheet can maintain its resilience.

[0009] Optionally, the fiber mesh is embedded in the corresponding soft graphite sheet.

[0010] By adopting the above technical solution, the connection rigidity between two adjacent soft graphite sheets can be effectively improved, thereby avoiding looseness between the stacked soft graphite sheets.

[0011] Optionally, the fiber mesh is made of aramid fiber.

[0012] By adopting the above technical solution, the aramid fiber has high temperature resistance, high strength and high deformation resistance, and can effectively maintain the shape of the stacked soft graphite sheets.

[0013] Optionally, an outer steel belt cofferdam is provided on the outer ring surface of the overlapping layer, and the surface of the outer steel belt cofferdam away from the overlapping layer is in conflict with the outer steel ring. An annular groove is provided on the outer steel ring, and two sliding blocks are slidably connected in the annular groove. The opposite sides of the two sliding blocks are fixedly connected to the first spring.

[0014] By adopting the above technical solution, the first spring is installed in the annular groove, so as to achieve the resistance of the outer steel ring to the outer steel belt cofferdam, thereby increasing the rebound ability of the gasket.

[0015] Optionally, a second spring is arranged in the annular groove, and two ends of the second spring are respectively fixedly connected to opposite sides of the two sliding blocks, and the two sliding blocks slide along the annular groove toward or away from the second spring.

[0016] By adopting the above technical solution, the two sliding blocks can slide synchronously along the annular groove toward the second spring, so that the first spring is deformed evenly.

[0017] Optionally, the second spring is a memory alloy that contracts when heated, and the heat contraction range of the second spring is smaller than the heat contraction range of the first spring, and the rigidity of the second spring is greater than the rigidity of the first spring.

[0018] By adopting the above technical solution, when the gasket works at high temperature, the second spring gradually contracts as the temperature increases, thereby pulling the first spring to deform the first spring, thereby improving the rebound ability of the gasket; if the ambient temperature further increases, the first spring contracts to pull the second spring to deform, thereby further improving the rebound ability of the gasket, which can effectively improve the working temperature range of the gasket and increase the scope of use.

[0019] Optionally, sealing rings are slidably connected to the opposite sides of the outer steel ring, and a driving ring is rotatably connected inside the outer steel ring. The driving ring is connected to one of the sliding blocks, and after the driving ring rotates, the sealing ring is controlled to move toward extending or retracting the outer steel ring.

[0020] By adopting the above technical solution, the sliding block controls the driving ring to rotate after sliding, so as to push out the sealing ring, so that the sealing ring abuts against the surface of the external workpiece, thereby further increasing the sealing effect of the gasket and reducing the gasket leakage due to high temperature.

[0021] Optionally, a cover ring is provided on a side of the outer steel ring away from the outer steel belt cofferdam.

[0022] By adopting the above technical solution, the cover ring seals the side of the outer steel ring away from the outer steel belt cofferdam, thereby avoiding damage to the parts inside the outer steel ring.

[0023] In summary, the present application includes at least one of the following beneficial technical effects: 1. The present application can effectively avoid the looseness between the soft graphite sheets by stacking the soft graphite sheets in the fiber mesh, and at the same time effectively improve the resilience of the gasket; 2. The present application combines the tensioning assembly with the fiber mesh, and the fiber mesh can effectively maintain the shape stability of the soft graphite sheet, which can effectively ensure the resilience of the gasket in a high temperature environment, and at the same time can further increase the resilience of the gasket as the temperature rises. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of this application; Figure 2 yes Figure 1 A schematic diagram of the partial cross-sectional structure along the AA plane; Figure 3 yes Figure 1 A local enlarged schematic diagram of the middle A; Figure 4 It is a schematic diagram of the overall structure of the present application, mainly showing the tensioning assembly; Figure 5 yes Figure 4 A partial enlarged schematic diagram of point B in the middle; Figure 6 It is a structural diagram of the present application, which mainly embodies the sealing ring and the driving ring.

[0025] Description of the drawings: 1. Inner steel ring; 2. Intermediate layer; 201. Inner steel belt cofferdam; 202. Outer steel belt cofferdam; 203. Overlay layer; 2031. Fiber mesh; 2032. Spacer; 2033. First soft graphite sheet; 2034. Second soft graphite sheet; 3. Outer steel ring; 4. First mounting groove; 5. Second mounting groove; 6. First ring wave surface; 7. Second ring wave surface; 8. Third ring wave surface; 9. Annular groove; 10. Sliding groove; 11. Tensioning assembly; 1101. Sliding block; 1102. First spring; 1103. Second spring; 12. Sealing groove; 13. Sealing ring; 14. First protrusion; 15. Drive groove; 16. Drive ring; 17. Second protrusion; 18. Drive hole; 19. Connecting block; 20. Cover ring. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1 -Attached Figure 6 , further details of this application are given.

[0027] A packing type graphite composite sealing gasket, referring to Figure 1 , Figure 2 , including an inner steel ring 1, an intermediate layer 2 and an outer steel ring 3 which are axially sleeved in sequence from the inside to the outside, and a tensioning component 11 for increasing the gasket's resilience is arranged inside the outer steel ring 3.

[0028] Reference Figure 2 The middle layer 2 includes an inner steel belt cofferdam 201, a laminated layer 203 and an outer steel belt cofferdam 202 which are axially sleeved in sequence, wherein the thickness of the inner steel belt cofferdam 201 is greater than that of the outer steel belt cofferdam 202, the cross sections of the inner steel belt cofferdam 201 and the outer steel belt cofferdam 202 are both "W" shaped, and the cross sections of the inner steel belt cofferdam 201 and the outer steel belt cofferdam 202 are in the same direction and opening. The inner steel belt cofferdam 201 is axially sleeved on the outer ring of the inner steel ring 1, and the outer ring surface of the inner steel ring 1 abuts against the surface of the inner steel belt cofferdam 201.

[0029] The laminated layer 203 includes a hollow-surfaced annular fiber mesh 2031, and the fiber mesh 2031 is an aramid fiber with high temperature resistance, high strength and high deformation resistance. In addition, three hollow-surfaced partitions 2032 arranged in sequence in the fiber mesh 2031 are integrally connected to the fiber mesh 2031. The partitions 2032 and the inner wall of the fiber mesh 2031 in the arrangement direction of the partitions 2032 and the two annular side walls of the fiber mesh 2031 enclose two first installation grooves 4. In addition, two adjacent partitions 2032 and the two annular inner walls of the fiber mesh 2031 enclose two second installation grooves 5.

[0030] A first soft graphite sheet 2033 is installed in the first installation groove 4. One of the two side surfaces arranged along the axial direction on the first soft graphite sheet 2033 is arranged as a smooth surface, and the surface of the flat surface abuts against the fiber mesh 2031. In addition, the other side surface of the first soft graphite sheet 2033 opposite to the flat surface is arranged as a first annular wave surface 6, and the surface of the first annular wave surface 6 abuts against the partition mesh 2032.

[0031] A second soft graphite sheet 2034 is installed in the second installation groove 5. One side of the second soft graphite sheet 2034 close to the corresponding first soft graphite sheet 2033 is set as a second ring wave surface 7 that fits the first ring wave surface 6, and the first ring wave surface 6 and the second ring wave surface 7 are staggered and abutted against each other. In addition, the two sides of the second soft graphite sheets close to each other are both set as third ring wave surfaces 8 that stagger and abut against each other.

[0032] After the first soft graphite sheet 2033 and the second soft graphite sheet 2034 are installed and stacked, the fiber mesh 2031 and the spacer mesh 2032 are pressed into the soft graphite sheet by a pressing machine, and the fiber mesh 2031 and the spacer mesh 2032 are embedded in the surface of the soft graphite sheet, wherein the spacer mesh 2032 is respectively embedded in two adjacent soft graphite sheets close to itself.

[0033] Reference Figure 3 , Figure 4 , Figure 5 The surface of the outer steel belt cofferdam 202 away from the middle layer 2 is in conflict with the outer steel ring 3, and the outer steel ring 3 is provided with an annular groove 9 on the side away from the outer steel belt cofferdam 202. Two arc-shaped sliding grooves 10 are provided in the annular groove 9, and the arc length of the sliding groove 10 is less than or equal to one quarter of the arc length of the annular groove 9. The tensioning assembly 11 provided on the outer steel ring 3 includes two sliding blocks 1101 slidably connected to the annular groove 9, and the sliding blocks 1101 are fixedly connected to two blocks extending into the corresponding sliding grooves 10, so that the sliding blocks 1101 slide along the sliding grooves 10.

[0034] Reference Figure 4 , Figure 5 A first spring 1102 and a second spring 1103 are arranged in the annular groove 9, wherein the two ends of the first spring 1102 are respectively fixedly connected to the sides of the two sliding blocks 1101 facing away from the sliding groove 10, and the two ends of the second spring 1103 are respectively fixedly connected to the sides opposite to the two sliding blocks 1101, and the second spring 1103 is arranged between the two sliding grooves 10.

[0035] Reference Figure 3 , Figure 5 , Figure 6Annular sealing grooves 12 are provided on two opposite surfaces of the outer steel ring 3, and a graphite sealing ring 13 is slidably connected in the sealing groove 12 to abut against an external workpiece. The sealing ring 13 is fixedly connected to the inner part of the outer steel ring 3 with three first protrusions 14, and the three first protrusions 14 are arranged equidistantly in a ring shape along the surface of the sealing ring 13.

[0036] Reference Figure 3 , Figure 6 , an annular driving groove 15 connected to the two sealing grooves 12 is provided in the outer steel ring 3, a driving ring 16 is rotatably connected in the driving groove 15, and second protrusions 17 extending into the corresponding sealing grooves 12 are fixedly connected on two opposite outer walls of the driving ring 16. In addition, the side of the first protrusion 14 close to the second protrusion 17 is set as an inclined pushing surface, and the side of the second protrusion 17 close to the first protrusion 14 is set as an inclined driving surface, and the pushing surface is in contact with the driving surface.

[0037] Reference Figure 5 , Figure 6 A driving hole 18 connected to the driving groove 15 is opened in the annular groove 9, and one end of a connecting block 19 is fixedly connected to the side of the driving ring 16 away from the outer steel belt cofferdam 202, and the other end of the connecting block 19 is fixedly connected to one of the sliding blocks 1101.

[0038] Reference Figure 3 , Figure 5 , a cover ring 20 is axially sleeved on the side of the outer steel ring 3 away from the outer steel belt cofferdam 202, and two fixing rings are fixedly connected to the cover ring 20, and the two fixing rings are inserted into the outer steel ring 3. In addition, an annular cover groove is provided on the side of the cover ring 20 close to the outer steel ring 3, and the annular cover groove cooperates with the annular groove 9 to form an annular sealing area, and the first spring 1102, the second spring 1103 and the two sliding blocks 1101 are arranged in the annular sealing area.

[0039] The implementation principle of the embodiment of the present application is as follows: the fiber mesh 2031 and the spacer mesh 2032 are embedded in the surface of the corresponding soft graphite sheet, and the surface shape of the soft graphite sheet can be maintained under a long-term high-temperature working environment. In addition, the soft graphite sheets are stacked in the fiber mesh 2031, so that the fiber mesh 2031 wraps the stacked soft graphite sheets, thereby avoiding stress relaxation between the stacked soft graphite sheets. At the same time, the spacer mesh 2032 respectively embedded in two adjacent soft graphite sheets can serve as a supporting skeleton between the two adjacent soft graphite sheets to improve the rigidity between the two adjacent soft graphite sheets.

[0040] In addition, the material of the first spring 1102 is nickel-titanium-hafnium shape memory alloy, and its temperature of thermal contraction is between 400° and 600°; the material of the second spring 1103 is copper-based high-temperature shape memory alloy, and its temperature of thermal contraction is between 200° and 400°, and the rigidity of the first spring 1102 is less than that of the second spring 1103.

[0041] When the gasket works in a high temperature environment, when the temperature reaches 200°, the second spring 1103 begins to shrink due to the heat, and gradually shrinks as the ambient temperature increases, thereby pulling the sliding blocks 1101 at both ends to deform the first spring 1102, so that the outer steel ring 3 applies pressure to the laminated layer 203, and at the same time pushes the drive ring 16 to rotate so that the sealing ring 13 contacts the external workpiece; when the temperature reaches 400°, the first spring 1102 begins to shrink due to the heat, and since the rigidity of the second spring 1103 is less than that of the first spring 1102, the second spring 1103 remains fixed when the first spring 1102 shrinks; after the working temperature gradually decreases, the first spring 1102, the second spring 1103 and the sealing ring 13 are restored in turn.

[0042] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A packing-type graphite composite sealing gasket, comprising an inner steel ring (1), an intermediate layer (2) and an outer steel ring (3) arranged in sequence from the inside to the outside, characterized in that: The intermediate layer (2) comprises an annular laminated layer (203) formed by stacking and pressing, the laminated layer (203) comprises a fiber mesh (2031), a plurality of installation grooves are arranged in the fiber mesh (2031), and soft graphite sheets are arranged in the installation grooves; The outer steel ring (3) is provided with a tensioning assembly (11), and the tensioning assembly (11) comprises a first spring (1102) sleeved on the outer steel ring (3), and the first spring (1102) is a memory alloy that shrinks when heated.

2. The filler-type graphite composite sealing gasket according to claim 1, characterized in that: The opposite sides of two adjacent soft graphite sheets in the fiber mesh (2031) are both arranged as ring wave surfaces, and the ring wave surfaces on the two adjacent soft graphite sheets are arranged in an interlaced manner and abut against each other.

3. The filler-type graphite composite sealing gasket according to claim 2, characterized in that: The fiber mesh (2031) is embedded in the corresponding soft graphite sheet.

4. The filler-type graphite composite sealing gasket according to claim 3, characterized in that: The fiber mesh (2031) is made of aramid fiber.

5. The filler-type graphite composite sealing gasket according to claim 1, characterized in that: The laminated layer (203) is provided with an outer steel belt cofferdam (202) on the outer ring surface, and the outer steel belt cofferdam (202) is in contact with the outer steel ring (3) away from the surface of the laminated layer (203). The outer steel ring (3) is provided with an annular groove (9), and two sliding blocks (1101) are slidably connected in the annular groove (9), and the opposite sides of the two sliding blocks (1101) are fixedly connected to the first spring (1102).

6. The filler-type graphite composite sealing gasket according to claim 5, characterized in that: A second spring (1103) is arranged in the annular groove (9), and two ends of the second spring (1103) are respectively fixedly connected to opposite sides of two sliding blocks (1101), and the two sliding blocks (1101) slide along the annular groove (9) toward or away from the second spring (1103).

7. The filler-type graphite composite sealing gasket according to claim 6, characterized in that: The second spring (1103) is a memory alloy that contracts when heated, and the heat contraction range of the second spring (1103) is smaller than the heat contraction range of the first spring (1102), and the rigidity of the second spring (1103) is greater than the rigidity of the first spring (1102).

8. The filler-type graphite composite sealing gasket according to claim 5, characterized in that: The outer steel ring (3) is slidably connected to sealing rings (13) on opposite sides, and the outer steel ring (3) is rotatably connected to a driving ring (16). The driving ring (16) is connected to one of the sliding blocks (1101). After the driving ring (16) rotates, it controls the sealing ring (13) to move toward extending or retracting the outer steel ring (3).

9. The filler-type graphite composite sealing gasket according to claim 5, characterized in that: A cover ring (20) is provided on the side of the outer steel ring (3) away from the outer steel belt cofferdam (202).

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