A layer-wound gasket with an asymmetric hemmed metal strip

Abstract

The present invention relates to the technical field of opening seals for pressure-bearing equipment, and particularly relates to a wound gasket with an asymmetrically flanged metal strip, which includes a skeleton and a gasket body. The skeleton is disposed inside and / or outside the gasket body. The gasket body includes multiple wound layers formed by laminating and winding metal strips. The cross-section of each wound layer is bent, and the lengths of the adjacent stacked flanges of the wound layers are different, so that the interval between adjacent two turns of flanges is increased, providing a deformation space for the elastic compression of the flanges of the wound layers and making it more resilient and sealed. It also provides a groove-shaped space for the packing layer to squeeze into the gap between adjacent two turns of wound layers, and is suitable for special use with asymmetric structures on both sides of the sealing surface. The packing layer obtains more firm protection during the handling and installation of the gasket. For users of large-diameter wound gaskets, there is no need to carefully move the wound gasket, and it will not be damaged by collision, and can maintain a good sealing effect.

Description

Technical Field

[0001] The present invention relates to the technical field of opening seals for pressure-bearing equipment, and particularly to a wound gasket with an asymmetrically flanged metal strip. Background Art

[0002] Existing opening seal gaskets for pressure-bearing equipment include flat metal ring gaskets, metal ring gaskets, metal serrated gaskets, metal corrugated gaskets, metal wound gaskets, and composite material gaskets. As Figure 1 shown is a cross-sectional side of a traditional wound seal gasket installed on a sealing surface 3, including a skeleton 2 and a gasket body 1. The skeleton 2 can be arranged inside the gasket body 1, outside the gasket body 1, or both inside and outside the gasket body 1 simultaneously. The gasket body 1 includes a gasket matrix and a filler layer attached to the surface of the matrix.

[0003] The main body of the traditional wound seal gasket is formed by winding and laminating metal sheets, and is commonly used for sealing small-diameter opening nozzles. For large-diameter wound seal gaskets, due to the low overall structural rigidity, careful handling is required during transportation, otherwise it is easy to damage or detach the composite filler on the sealing side, and even the wound and laminated metal sheets are scattered. Moreover, when the fastening stud positions the gasket body, it is easy to crush, squeeze, and distort the metal wound gasket. The metal wound gasket is squeezed and distorted, displaced, and separated from the sealing surface.

[0004] The inventor analyzed and found that a large number of stud-forced-sealed flange pairs are applied in pressure-bearing equipment. Under the action of internal pressure, the flange ring deflects, with a general tendency of the inner side to open and the outer side to clamp. Correspondingly, a higher resilience is required for a section of width near the inner side of the gasket to compensate for the opening of the flange sealing surface, and a higher compressive strength is required for a section of width near the outer side of the gasket to prevent it from being crushed. However, the traditional wound steel strip is a complete steel strip as a single-head single-layer spiral winding, and the resulting gasket body is relatively uniform in width from the inside to the outside and cannot adapt to the general tendency of the flange pair deformation. In conventional understanding, although people understand the deflection and opening of the flange ring, they do not consider the improvement of the supplier itself to adapt to this precise demand of the demander.

[0005] The inventor also analyzed and found that the composite filler of the traditional wound seal gasket is only lightly pressed on the sealing side of the main body. During the transportation or installation of large-diameter gaskets onto the flange sealing surface, it is easy to cause the metal wound gasket to shake, twist, and make the composite filler loosen from the sealing side. In conventional understanding, although people are aware of this adverse phenomenon, the conventional practice is to select other gaskets such as corrugated gaskets, and do not consider the improvement of the supplier itself to adapt to this urgent demand of the demander.

[0006] In summary, the existing metal wound gaskets have problems of being damaged by internal pressure, extrusion, and loosening of the composite filler during use. Solving these two problems can make the structural function of the metal wound gasket more perfect. Summary of the Invention

[0007] In view of the above technical problems in the prior art, the present invention provides a wound gasket with an asymmetrically folded metal strip, which can avoid the problems of being damaged by internal pressure, extrusion, and loosening of the composite filler during use.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] Provide a wound gasket with an asymmetrically folded metal strip, including a skeleton and a gasket body. The skeleton is arranged inside and / or outside the gasket body. The gasket body includes multiple wound layers formed by laminating metal strips. The cross-section of each wound layer is bent. The feature is that the lengths of the adjacent laminated folded edges of some or all of the wound layers are different, so as to leave a deformation space on the side of different wound layers. A filler layer is provided in the deformation space and / or the folded edge gap between adjacent wound layers.

[0010] Optionally, the cross-section of each wound layer is in a V-shaped arch, and the bending points of each wound layer are arranged in alignment.

[0011] Optionally, the lengths of the two folded edges of the same wound layer are different, and the long and short sides of each adjacent two wound layers are arranged alternately.

[0012] Optionally, along the lamination direction, the folded edges with the same length of several wound layers are aligned and laminated, and then separated by the folded edges of the wound layers with different lengths.

[0013] Optionally, the wound layers of the gasket body are continuously helically wound.

[0014] Optionally, the wound layers of the gasket body are in a concentric circle structure for each turn. The joints at both ends of each turn are spot-welded firmly, and the spot-welded joints of adjacent two turns are arranged staggeredly by 180° in the circumferential direction.

[0015] Optionally, several wound layers close to the pressure side and away from the pressure side are continuously wound, and the wound layers in between are in a concentric circle structure separated by each turn. The joints at both ends of each turn are spot-welded firmly, and the spot-welded joints of adjacent two turns are arranged staggeredly by 180° in the circumferential direction.

[0016] Optionally, the thicknesses of different wound layers are equal or unequal.

[0017] Optionally, the metal strips of different wound layers are of the same material or different materials.

[0018] Optionally, each winding layer arches inwards towards the pressure side or outwards away from the pressure side.

[0019] Advantages of the present invention:

[0020] The layer-wound gasket of the present invention with an asymmetrically hemmed metal strip, the winding layer formed by laminating and winding the metal strips, the unequal hem lengths result in an increased interval between adjacent turns of the hems, providing a deformation space for the elastic compression of the hems of the winding layer and thus having better resilience and sealing performance. It also provides a trough-shaped space for the packing layer to squeeze into the gap between adjacent turns of the winding layer, and is suitable for special use with asymmetric structures on both sides of the sealing surface. The packing layer is more firmly protected during gasket handling and installation. For users of large-diameter layer-wound gaskets, there is no need to handle the layer-wound gasket carefully, and it will not be damaged by collision, and can maintain good sealing performance. Description of the drawings

[0021] Figure 1 It is a schematic structural diagram of an existing sealing gasket.

[0022] Figure 2 It is a first schematic structural diagram of a layer-wound gasket with an asymmetrically hemmed metal strip.

[0023] Figure 3 It is a second schematic structural diagram of a layer-wound gasket with an asymmetrically hemmed metal strip.

[0024] Figure 4 It is a third schematic structural diagram of a layer-wound gasket with an asymmetrically hemmed metal strip.

[0025] Figure 5 It is a fourth schematic structural diagram of a layer-wound gasket with an asymmetrically hemmed metal strip.

[0026] Figure 6 It is a fifth schematic structural diagram of a layer-wound gasket with an asymmetrically hemmed metal strip.

[0027] Figure 7 It is a sixth schematic structural diagram of a layer-wound gasket with an asymmetrically hemmed metal strip.

[0028] Reference numerals:

[0029] Figure 1 : Gasket body 1, skeleton 2, sealing surface 3;

[0030] Figures 2 - 7 :

[0031] 1-1 Short hem, 1-2 Long hem, 1-3 Single-layer long hem, 1-4 Three-layer long hem, 1-5 Double-layer long hem, 1-6 Single-layer long hem, 1-7 Spirally wound steel strip, 1-8 Strip wrapped around each turn, 1-9 Packing layer. Detailed implementation mode

[0032] The present invention will be described in detail below in conjunction with specific embodiments and the accompanying drawings.

[0033] The wound gasket with an asymmetric hemmed metal strip in this embodiment, as Figure 2 shown, includes a skeleton and a gasket body. The skeleton is arranged on the inner side and / or the outer side of the gasket body. The gasket body includes multiple wound layers formed by laminating and winding metal strips. The cross-section of each wound layer is bent, and the cross-section of each wound layer is a V-shaped arch, and the bending parts of each wound layer are arranged in alignment. As an improvement, the lengths of the two hems of the same wound layer are different, including the short side 1-1 and the long side 1-2. The long and short sides of each adjacent two wound layers are arranged alternately. In this way, the two stacked hems of each adjacent layer are one long and one short, and a deformation space is formed at the shorter hem (between two adjacent longer hems).

[0034] The above is that the lengths of the adjacent stacked hems of all the wound layers are different. In another embodiment, it can be changed to that only the lengths of the adjacent stacked hems of some adjacent wound layers are different. As shown in FIG. 3, it includes a single-layer long hem 1-3 and a three-layer long hem 1-4. Along the stacking direction, the hems with the same length of several wound layers are stacked in alignment and then separated by the hems of the wound layers with different lengths. Specifically Figure 3 the upper half part: one layer of long side, three layers of short side, one layer of long side... arranged in this way; for the lower half part: three layers of long side, one layer of short side, three layers of long side... arranged in this way. Or as Figure 4 shown, it includes a double-layer long hem 1-5 and a single-layer long hem 1-6. Near the pressure side (the inner side of the sealed opening) is a single-piece long hem and the outer side is provided with a double-piece long hem.

[0035] As Figure 7 shown, a filler layer 1-9 is provided in the deformation space and the hem gap between adjacent wound layers. The filler layer in the deformation space and the filler layer in the hem gap have the same or different physical properties. Preferably, the filler layer in the deformation space is a high-density gasket material, and the filler layer in the hem gap is a low-density gasket material. The filler layer is omitted in other figures.

[0036] As can be seen from the above, the gasket body is a wound layer formed by laminating and winding metal strips. The unequal lengths of its hems increase the interval between adjacent two turns of hems, providing a deformation space for the elastic compression of the hems of the wound layer and making it more resilient and sealed. It also provides a groove-shaped space for the filler layer to squeeze into the gap between adjacent two turns of wound layers, and is suitable for the special asymmetric structure on both sides of the sealing surface. The filler layer is more firmly protected during the handling and installation of the gasket. For the user of the large-diameter wound gasket, there is no need to handle the wound gasket carefully, and it will not be damaged by collision, and can maintain a good sealing effect.

[0037] Traditional layer-wound gaskets are designed based on a symmetric structure on both sides of the sealing surface. In fact, in addition to the sealing between flanges, there are also seals with asymmetric structures on both sides such as the seal between a flange and a blind flange, the seal between the flange on the tube side and the flange on the shell side, and the seal between a flange and a tube sheet. In this embodiment, for the asymmetric layer-wound gasket, the unequal hemming lengths result in differences in the structural strength and rigidity on both sides of the sealing surface. The unequal hemming lengths also cause differences in the structural strength and rigidity on the inner and outer sides of the gasket.

[0038] In this embodiment, the winding layer of the gasket body is continuously helically wound, as Figure 5 shown, it is the helically wound steel strip 1-7. Or, as Figure 6 shown, the winding layer of the gasket body is a concentric circle structure for each turn. Each turn is spot-welded firmly at the joints at both ends of the turn, and the spot-welded joints of adjacent turns are arranged with a 180° stagger in the circumferential direction, which is the steel strip 1-8 wrapped around each turn. Or in practice, it can be changed to that several winding layers near the pressure side and away from the pressure side are continuously wound, and the winding layers in between are concentric circle structures separated by each turn. Each turn is spot-welded firmly at the joints at both ends of the turn, and the spot-welded joints of adjacent turns are arranged with a 180° stagger in the circumferential direction to more precisely meet special sealing requirements.

[0039] In actual production, the thicknesses of different winding layers are equal or unequal. This causes differences in the structural strength and rigidity on the inner and outer sides of the gasket, or makes the structural strength and rigidity in the middle of the gasket width particularly high.

[0040] In actual production, the different winding layers are made of metal strips with the same material or different materials. The purpose is also based on mechanical analysis to design and manufacture special gaskets with uneven strength to adapt to the sealing surface with uneven deformation displacement.

[0041] During actual processing, each winding layer arches inward towards the pressure side or arches outward away from the pressure side.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A wound gasket with an asymmetrically hemmed metal strip, comprising a skeleton and a gasket body, wherein the skeleton is disposed inside and / or outside the gasket body, and the gasket body includes multiple wound layers formed by laminating and winding a metal strip in the inner and outer directions, and the cross-section of each wound layer is bent. Characterized in that: The cross-section of each wound layer is in a V-shaped arch, and the lengths of the adjacent laminated hems of some or all of the wound layers are different, so as to leave a deformation space at the side of different wound layers, and a filler layer is provided in the deformation space and the hem gap between adjacent wound layers; The deformation space provides a groove-shaped space for the filler layer to squeeze into the hem gap between adjacent wound layers.

2. The wound gasket with an asymmetrically hemmed metal strip according to claim 1, Characterized in that: The cross-section of each wound layer is in a V-shaped arch, and the bent parts of each wound layer are arranged in alignment.

3. The wound gasket with an asymmetrically hemmed metal strip according to claim 2, Characterized in that: The lengths of the two hems of the same wound layer are different, and the long and short sides of each adjacent two wound layers are arranged alternately.

4. The wound gasket with an asymmetrically hemmed metal strip according to claim 1, Characterized in that: Along the lamination direction, the hems with the same length of several wound layers are aligned and laminated and then separated by the hems of the wound layers with different lengths.

5. The wound gasket with an asymmetrically hemmed metal strip according to claim 1, Characterized in that: The wound layers of the gasket body are continuously spirally wound.

6. The wound gasket with an asymmetrically hemmed metal strip according to claim 1, Characterized in that: The wound layers of the gasket body are in a concentric circle structure for each turn, and the joints at both ends of each turn are firmly spot-welded, and the spot-welded joints of adjacent two turns are arranged staggeredly by 180° in the circumferential direction.

7. The wound gasket with an asymmetrically hemmed metal strip according to claim 1, Characterized in that: Several wound layers close to the pressure side and away from the pressure side are continuously wound, and the wound layers therebetween are in a concentric circle structure separated for each turn, and the joints at both ends of each turn are firmly spot-welded, and the spot-welded joints of adjacent two turns are arranged staggeredly by 180° in the circumferential direction.

8. The wound gasket with an asymmetrically hemmed metal strip according to claim 1, Characterized in that: The thicknesses of different wound layers are equal or unequal.

9. The wound gasket with an asymmetrically hemmed metal strip according to claim 1, Characterized in that: The metal strips of different wound layers are metal strips of the same material or metal strips of different materials.

10. The wound gasket with an asymmetrically hemmed metal strip according to claim 1, Characterized in that: Each wound layer arches inwards towards the pressure side or outwards away from the pressure side.

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