Metal spiral wound gasket

Abstract

The invention relates to a metal spiral wound gasket which comprises an outer ring, an inner ring, a metal belt, a non-metal belt and a connecting strip. A space is formed between the outer ring and the inner ring; notches are respectively formed in the outer ring and the inner ring; wherein the outer ring and the inner ring are coaxially arranged; the metal belts and the non-metal belts are alternately stacked in the space; the metal belt and the non-metal belt are fixedly connected through the connecting strip; and the two ends of the metal belt are respectively embedded into the notch on the outer ring and the notch on the inner ring. The problem that the sealing effect of the metal spiral wound gasket is affected due to the fact that the metal spiral wound gasket is stressed after being installed and a gap is formed between a metal belt and a non-metal belt is loosened in winding in the prior art is solved.

Description

Technical Field

[0001] The invention relates to the field of gaskets, and in particular to a metal spiral wound gasket. Background Art

[0002] The metal spiral wound gasket is formed by winding metal and non-metal belts together to form an annular structure, and the outer ring and inner ring are installed on the outer ring and inner ring of the annular structure. In order to make the annular structure, the outer ring and the inner ring fit tightly, the annular structure needs to be pressed between the outer ring and the inner ring.

[0003] For large-sized metal spiral wound gaskets, the outer ring and inner ring are also large in size, which makes the structural strength of the outer ring and inner ring weak. There is an installation gap between the annular structure, the outer ring and the inner ring, which makes the metal spiral wound gasket stressed after installation, and the metal belt and non-metal belt are loosened to form a gap, thus affecting the sealing effect of the metal spiral wound gasket.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0005] In view of the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide a metal wound gasket to solve the problem in the prior art that the metal wound gasket is subjected to force after installation, and a gap is formed between the metal belt and the non-metallic belt winding, thereby affecting the sealing effect of the metal wound gasket.

[0006] To achieve the above object, the technical solution of the present invention is as follows:

[0007] A metal spiral wound gasket;

[0008] It comprises: an outer ring, an inner ring, a metal belt, a non-metal belt and a connecting strip; a space is formed between the outer ring and the inner ring; and gaps are formed on the outer ring and the inner ring respectively;

[0009] Wherein, the outer ring and the inner ring are coaxially arranged; the metal belt and the non-metal belt are alternately stacked and arranged in the space; the metal belt and the non-metal belt are fixedly connected by the connecting strip; the two ends of the metal belt are respectively embedded in the notch on the outer ring and the notch on the inner ring;

[0010] The metal belt includes a first contact segment and guide segments located on both sides of the first contact segment; the non-metal belt includes a second contact segment and expansion segments located on both sides of the second contact segment; the first contact segment and the second contact segment contact and squeeze each other, the expansion segment expands due to the squeezing force, and the guide segment limits the expansion range of the expansion segment.

[0011] A further technical solution is that ribs are formed along the first contact segment; when the first contact segment and the second contact segment contact each other, the ribs are pressed into the second contact segment; and the ribs near the guide segment squeeze the expansion segment outward.

[0012] A further technical solution is that the metal wound gasket also includes a covering layer; a cutout is formed on the guide section; the covering layer coats the metal strip and the non-metal strip respectively and fills the cutout; one group of the connecting strips is located between the metal strip and the non-metal strip, and another group of the connecting strips respectively connects the cutout and the expansion section.

[0013] A further technical solution is that the notch is set at an angle; after the metal strip is embedded in the notch, the notch narrows and clamps the metal strip; the metal strip and the non-metal strip are alternately stacked in the space, and the metal strip is bent near the notch; the inclination of the notch is related to the bending angle of the metal strip.

[0014] A further technical solution is that guide blocks are respectively arranged on the outer ring and the inner ring near the notch; the guide blocks extend along the bending position of the metal strip and fill the space.

[0015] A further technical solution is that a woven mesh belt is arranged along the non-metallic belt; mesh wires are formed on both sides of the mesh belt; the mesh wires extend along the expansion section and pull the expansion section.

[0016] Compared with the prior art, the beneficial technical effects of the present invention are as follows: (1) one group of connecting strips is located between the interlayers in which the metal strip and the non-metal strip are wound together, and the other group of connecting strips is located on the side of the metal strip and the side of the non-metal strip; the two groups of connecting strips are used to cover the non-metal strip at a certain density, connect the metal strip and the non-metal strip, and avoid displacement, cracks and transitional deformation of the non-metal strip; during the assembly process, the two ends of the metal strip are respectively embedded in the notch on the outer ring and the notch on the inner ring, and then the wound metal strip and the non-metal strip are pressed into the space; in order to allow the metal strip to be accurately inserted into the notch, the position where the metal strip is inserted into the notch needs to be bent at a certain angle, and the bending of the metal strip increases the diameter of the annular structure, so that after the annular structure is set in the space, the metal strip, the outer ring and the inner ring are interference fit, so that the wound metal strip and the non-metal strip can be securely installed in the space; at the same time, the pressure generated by the interference fit narrows the notch to firmly clamp the metal strip, avoiding the loosening of the metal strip.

[0017] (2) When the first contact segment and the second contact segment contact each other, the ribs are pressed into the second contact segment, and the non-metallic belt is limited to move in the left and right directions by the ribs; at the same time, during the process of the ribs being pressed in, a group of connecting strips are bent by force, and the position of a group of connecting strips is also limited by the ribs, so that a group of connecting strips can continuously pull the second contact segment, thereby preventing the non-metallic belt from moving, cracking, and transitional deformation.

[0018] (3) The structure of the rib near the guide section changes. Since the rib near the guide section needs to squeeze the expansion section outward, a slope is formed on the side of the rib near the expansion section, and the size of the rib is larger than other ribs. Since the rib near the guide section has a slope, a sharp corner will be formed on the rib. At the same time, in order to increase the deformation of the expansion section under compression, the size of the rib is increased accordingly. With these two factors combined, if the rib in the middle of the first contact section adopts this structure, it will cut the second contact section. Therefore, the rib in the middle of the first contact section is smaller in size, and the side that contacts the second contact section is an arc surface, which will not cut the second contact section. Since the extrusion force of the rib near the guide section acts on the expansion section, there is a certain deformation space for the expansion section, and it will not cut the expansion section.

[0019] (4) After the metal belt is embedded in the notch, the notch narrows and clamps the metal belt; the metal belt and the non-metal belt are alternately stacked in the space, and the metal belt is bent near the notch; the notch clamps the bend, which effectively enhances the fixation of the metal belt. The bending of the metal belt increases the diameter of the annular structure after the metal belt and the non-metal belt are alternately stacked, so that the metal belt is interference-fitted with the outer ring and the inner ring, so that the metal belt and the non-metal belt are firmly installed in the space; at the same time, the outward tension generated by the interference fit of the metal belt keeps the notch narrowed to prevent the metal belt from loosening.

[0020] (5) A woven mesh belt is arranged along the non-metallic belt, and mesh wires are formed on both sides of the mesh belt; the mesh belt has a sparse weaving density, and the mesh wires are formed in parallel on the left and right sides of the mesh belt; the upper and lower sides of the non-metallic belt are heated to soften, and then the mesh belt is pressed into the second contact section and the expansion section is hot-pressed to form, so that the mesh wires are distributed on the expansion section, and the mesh wires extend along the expansion section and pull the expansion section; the mesh belt and the mesh wires are used to pull the non-metallic belt, thereby limiting the deformation range of the non-metallic belt and avoiding displacement, cracks and excessive deformation of the non-metallic belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A partial cross-sectional view of a metal wound gasket according to an embodiment of the present invention is shown.

[0022] Figure 2 A partial cross-sectional view of a metal belt and a non-metal belt according to an embodiment of the present invention is shown.

[0023] Figure 3 Shows Figure 2 Enlarged structural diagram of point A in the middle.

[0024] Figure 4 Shows Figure 2 Enlarged structural diagram of point B in the middle.

[0025] Figure 5 A partial expanded view of a non-metallic belt according to an embodiment of the present invention is shown.

[0026] Figure 6 A right-side partial view showing the notch position of the metal wound gasket according to an embodiment of the present invention is shown.

[0027] Markings in the accompanying drawings: 1. outer ring; 2. inner ring; 3. metal belt; 31. first contact section; 32. guide section; 33. rib; 331. inclined surface; 34. incision; 4. non-metal belt; 41. second contact section; 42. expansion section; 5. connecting strip; 51. notch; 52. guide block; 6. space; 61. defective space; 7. covering layer; 8. mesh belt; 81. mesh wire. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the present invention clearer, the device proposed by the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the accompanying drawings adopt a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, please refer to the accompanying drawings. It should be noted that the structure, proportion, size, etc. illustrated by the accompanying drawings of this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effect that the present invention can produce and the purpose that can be achieved, should still fall within the scope of the technical content disclosed by the present invention.

[0029] First embodiment:

[0030] Figure 1 A partial cross-sectional view of a metal wound gasket according to an embodiment of the present invention is shown. Figure 2 A partial cross-sectional view of a metal belt and a non-metal belt according to an embodiment of the present invention is shown. Figure 3 Shows Figure 2 Enlarged structural diagram of point A in the middle. Figure 4 Shows Figure 2 Enlarged structural diagram of point B in the middle. Figure 5 A partial expanded view of a non-metallic belt according to an embodiment of the present invention is shown. Figure 6The right side partial view of the notch position of the metal spiral wound gasket according to the embodiment of the present invention is shown. Figure 1-Figure 6 As shown, the present invention discloses a metal spiral wound gasket.

[0031] The metal spiral wound gasket comprises: an outer ring 1, an inner ring 2, a metal belt 3, a non-metal belt 4 and a connecting strip 5. The outer ring 1 and the inner ring 2 are coaxially arranged, and a space 6 is formed between the outer ring 1 and the inner ring 2. Notches 51 are formed on the inner surface of the outer ring 1 and the outer surface of the inner ring 2, respectively.

[0032] The metal belt 3 and the non-metal belt 4 are fixedly connected by connecting strips 5, one group of connecting strips 5 is located between the interlayers of the metal belt 3 and the non-metal belt 4, and the other group of connecting strips 5 is located on the side of the metal belt 3 and the side of the non-metal belt 4. The two groups of connecting strips 5 are used to cover the non-metal belt 4 with a certain density, connect the metal belt 3 and the non-metal belt 4, and prevent the non-metal belt 4 from displacement, cracks and excessive deformation.

[0033] The metal belt 3 and the non-metal belt 4 are wound around each other to form an alternately stacked annular structure, and then the annular structure is arranged in the space 6 to complete the assembly of the metal spiral wound gasket. The inner and outer rings of the annular structure are both metal belts 3 to avoid exposure of the non-metal belt 4. Exemplarily, the non-metal belt 4 is made of rubber.

[0034] During the assembly process, the two ends of the metal belt 3 are respectively inserted into the notch 51 on the outer ring 1 and the notch 51 on the inner ring 2, and then the wound metal belt 3 and the non-metal belt 4 are pressed into the space 6. In order to allow the metal belt 3 to be accurately inserted into the notch 51, the position where the metal belt 3 is inserted into the notch 51 needs to be bent at a certain angle. After the metal belt 3 is bent, the diameter of the annular structure is increased, so that after the annular structure is set in the space 6, the metal belt 3, the outer ring 1 and the inner ring 2 are interference fit, so that the wound metal belt 3 and the non-metal belt 4 can be securely installed in the space 6. At the same time, the pressure generated by the interference fit narrows the notch 51 to securely clamp the metal belt 3 to prevent the metal belt 3 from loosening.

[0035] The metal belt 3 includes a first contact segment 31 and guide segments 32 located on both sides of the first contact segment 31. The upper and lower surfaces of the first contact segment 31 are parallel to each other, and the guide segment 32 gradually narrows from the inside to the outside. The non-metallic belt 4 includes a second contact segment 41 and expansion segments 42 located on both sides of the second contact segment 41. The upper and lower surfaces of the second contact segment 41 are parallel to each other, and the expansion segment 42 gradually expands from the inside to the outside.

[0036] During the winding process of the metal strip 3 and the non-metal strip 4 , the first contact section 31 and the second contact section 41 contact and squeeze each other, and the squeezing force extends to both sides, so that the expansion section 42 expands due to the squeezing force, and the guide section 32 limits the expansion range of the expansion section 42 .

[0037] The narrowing amplitude of the guide section 32 is negatively correlated with the expansion degree of the expansion section 42. The smaller the narrowing amplitude of the guide section 32, the greater the expansion degree of the expansion section 42. The narrowing amplitude of the guide section 32 is small, and the thickness of the guide section 32 changes more gently. The expansion section 42 mainly expands to the left and right sides after being squeezed, so that the expansion degree of the expansion section 42 is large, and the expansion section 42 forms a large deformation range, so that the metal wound gasket can adapt to the sealing installation in an uneven position. The narrowing amplitude of the guide section 32 is large, and the thickness of the guide section 32 changes more steeply. The expansion section 42 will also expand to the upper and lower sides after being squeezed, so that the expansion degree of the expansion section 42 is weakened, and the contact surface between the expansion section 42 and the installation position is increased, so that the metal wound gasket can adapt to the sealing installation in a flat position.

[0038] A rib 33 is formed along the first contact segment 31, and the rib 33 is arranged on the first contact segment 31 in the front-to-back direction. When the first contact segment 31 and the second contact segment 41 contact each other, the rib 33 is pressed into the second contact segment 41, and the non-metallic belt 4 is limited to move in the left-right direction by the rib 33. At the same time, during the pressing process of the rib 33, a group of connecting strips 5 are bent by force, and the position of a group of connecting strips 5 is also limited by the rib 33, so that a group of connecting strips 5 can continuously pull the second contact segment 41, thereby preventing the non-metallic belt 4 from moving, cracking, and transitional deformation.

[0039] The structure of the rib 33 near the guide section 32 is changed. Since the rib 33 near the guide section 32 needs to squeeze the expansion section 42 outward, a slope 331 is formed on the side of the rib 33 near the expansion section 42, and the size of the rib 33 is larger than that of other ribs 33. Since the rib 33 near the guide section 32 has the slope 331, a sharp corner is formed on the rib 33. At the same time, in order to increase the deformation amount of the expansion section 42 under compression, the size of the rib 33 is increased accordingly. With these two factors combined, if the rib 33 at the middle position of the first contact section 31 adopts this structure, the second contact section 41 will be cut. Therefore, the rib 33 at the middle position of the first contact section 31 is smaller in size, and the side contacting the second contact section 41 is an arc surface, and the second contact section 41 will not be cut. Since the extrusion force of the rib 33 near the guide section 32 acts on the expansion section 42, there is a certain deformation space for the expansion section 42, and the expansion section 42 will not be cut.

[0040] The inclination of the inclined surface 331 is related to the deformation of the expansion section 42. If the inclination of the inclined surface 331 is gentler, the deformation of the expansion section 42 is greater. If the inclination of the inclined surface 331 is steeper, the deformation of the expansion section 42 is smaller.

[0041] The metal spiral wound gasket further includes a covering layer 7. Exemplarily, the covering layer 7 is made of graphite. A cutout 34 is formed on the guide section 32. The covering layer 7 coats the metal strip 3 and the non-metal strip 4, respectively, and fills the cutout 34. A portion of the covering layer 7 is coated between the first contact section 31 and the second contact section 41, and another portion of the covering layer 7 is coated on the guide section 32 and the expansion section 42.

[0042] One group of connecting strips 5 is located between the metal strip 3 and the non-metal strip 4, and another group of connecting strips 5 connects the cutouts 34 and the expansion sections 42, respectively.

[0043] A portion of the covering layer 7 improves the corrosion resistance and high temperature resistance between the first contact section 31 and the second contact section 41, avoiding corrosion of a group of connecting strips 5, so that a group of connecting strips 5 can continuously pull the non-metallic belt 4. Another portion of the covering layer 7 improves the corrosion resistance and high temperature resistance of the outer side of the guide section 32 and the expansion section 42, avoiding corrosion of another group of connecting strips 5, so that another group of connecting strips 5 can continuously pull the non-metallic belt 4. At the same time, the covering layer 7 fills the cutout 34 to prevent another group of connecting strips 5 from detaching from the cutout 34, and can fix another group of connecting strips 5 on the guide section 32, ensuring that another group of connecting strips 5 can continuously pull the non-metallic belt 4. The covering layer 7 improves the corrosion resistance and high temperature resistance of the metal spiral wound gasket, while preventing the connecting strips 5 from being damaged.

[0044] Exemplarily, the notch 51 is set at an angle. After the metal belt 3 is inserted into the notch 51, the notch 51 narrows and clamps the metal belt 3. The metal belt 3 and the non-metal belt 4 are alternately stacked in the space 6, and the metal belt 3 is bent near the notch 51. The clamping of the notch 51 at the bend effectively enhances the fixity of the metal belt 3. The bending of the metal belt 3 increases the diameter of the annular structure after the metal belt 3 and the non-metal belt 4 are alternately stacked, so that the metal belt 3 is interference-fitted with the outer ring 1 and the inner ring 2, so that the metal belt 3 and the non-metal belt 4 are firmly installed in the space 6. At the same time, the outward tension generated by the interference fit of the metal belt 3 keeps the notch 51 narrowed to prevent the metal belt 3 from loosening.

[0045] The inclination of the notch 51 is related to the bending angle of the metal strip 3. The gentler the inclination of the notch 51, the larger the bending angle of the metal strip 3. The steeper the inclination of the notch 51, the smaller the bending angle of the metal strip 3. The small bending angle of the metal strip 3 forms an acute angle, the bending positions of the metal strip 3 overlap, the diameter of the annular structure is large, the metal strip 3 is interference-fitted with the outer ring 1 and the inner ring 2, and the outer ring 1 and the inner ring 2 exert a large extrusion pressure on the metal strip 3.

[0046] The inclination of the notch 51 depends on the size of the metal wound gasket. The larger the size of the metal wound gasket, the steeper the inclination of the notch 51. The smaller the size of the metal wound gasket, the gentler the inclination of the notch 51. The larger the size of the metal wound gasket, the weaker the structural strength of the outer ring 1 and the inner ring 2. By increasing the diameter of the annular structure, the space 6 can be tightly filled to ensure the structural strength of the metal wound gasket.

[0047] Guide blocks 52 are respectively arranged on the outer ring 1 and the inner ring 2 near the notch 51. The metal belt 3 and the non-metal belt 4 are wound around each other to form an alternately stacked annular structure. At the end of the winding of the metal belt 3, annular openings are respectively formed on the inner and outer rings of the annular structure. After the annular structure is arranged in the space 6, the annular opening and the edge of the space 6 form a defect space 61.

[0048] The guide block 52 is arranged on the outer ring 1 and the inner ring 2 and is placed in the defect space 61. The guide block 52 extends along the bending position of the metal strip 3, and the space 6 can be filled by the annular structure and the guide block 52. By fully covering the space 6, the sealing performance of the metal spiral wound gasket is guaranteed.

[0049] Due to the difference in the bending angle of the metal strip 3, the shape of the guide block 52 is different. The guide block 52 supports and limits the bending position of the metal strip 3, thereby preventing the bending position of the metal strip 3 from changing. The metal strip 3 is prevented from loosening, so that the metal strip 3 and the non-metal strip 4 form an alternately stacked annular structure with a compact structure, thereby ensuring the sealing performance of the metal spiral wound gasket.

[0050] A woven mesh belt 8 is arranged along the non-metallic belt 4, and mesh wires 81 are formed on both sides of the mesh belt 8. The mesh belt 8 has a sparse weaving density, and the mesh wires 81 are formed in parallel on the left and right sides of the mesh belt 8. The upper and lower sides of the non-metallic belt 4 are heated to soften, and then the mesh belt 8 is pressed into the second contact section 41 and the expansion section 42 is hot-pressed to form, so that the mesh wires 81 are distributed on the expansion section 42, and the mesh wires 81 extend along the expansion section 42 and pull the expansion section 42.

[0051] The mesh belt 8 forms a pull on the second contact segment 41 along the winding direction of the non-metallic belt 4 and the left and right direction of the second contact segment 41. When the metal belt 3 and the non-metallic belt 4 are wound around each other, the metal belt 3 and the non-metallic belt 4 are squeezed against each other, and the non-metallic belt 4 is squeezed from the metal belt 3 in the upper and lower directions. The mesh belt 8 is distributed along the second contact segment 41, and when the second contact segment 41 is squeezed, the mesh belt 8 forms a pull on the second contact segment 41.

[0052] The mesh wire 81 pulls the expansion section 42 along the left and right directions of the expansion section 42. When the metal belt 3 and the non-metal belt 4 are wound around each other, the metal belt 3 and the non-metal belt 4 are squeezed against each other, and the expansion section 42 is squeezed by the upward and downward direction guide section 32. The mesh wire 81 is distributed along the expansion section 42, and when the expansion section 42 is squeezed, the mesh wire 81 pulls the expansion section 42.

[0053] The non-metallic belt 4 is pulled by the mesh belt 8 and the mesh wire 81, thereby limiting the deformation range of the non-metallic belt 4 and preventing the non-metallic belt 4 from displacement, cracks and excessive deformation.

[0054] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A metal spiral wound gasket, characterized in that: include: An outer ring (1), an inner ring (2), a metal belt (3), a non-metal belt (4) and a connecting strip (5); a space (6) is formed between the outer ring (1) and the inner ring (2); and notches (51) are formed on the outer ring (1) and the inner ring (2). The outer ring (1) and the inner ring (2) are coaxially arranged; the metal belt (3) and the non-metal belt (4) are alternately stacked and arranged in the space (6); the metal belt (3) and the non-metal belt (4) are fixedly connected by the connecting strip (5); the two ends of the metal belt (3) are respectively embedded in the notch (51) on the outer ring (1) and the notch (51) on the inner ring (2); The metal strip (3) comprises a first contact section (31) and guide sections (32) located on both sides of the first contact section (31); the non-metal strip (4) comprises a second contact section (41) and expansion sections (42) located on both sides of the second contact section (41); the first contact section (31) and the second contact section (41) contact and squeeze each other, the expansion section (42) expands due to the squeezing force, and the guide section (32) limits the expansion range of the expansion section (42).

2. The metal spiral wound gasket according to claim 1, characterized in that: A rib (33) is formed along the first contact section (31); when the first contact section (31) and the second contact section (41) contact each other, the rib (33) is pressed into the second contact section (41); and the rib (33) near the guide section (32) presses the expansion section (42) outwards.

3. The metal spiral wound gasket according to claim 2, characterized in that: The metal wound gasket also includes a covering layer (7); a cutout (34) is formed on the guide section (32); the covering layer (7) coats the metal strip (3) and the non-metal strip (4) respectively and fills the cutout (34); one group of the connecting strips (5) is located between the metal strip (3) and the non-metal strip (4), and another group of the connecting strips (5) respectively connects the cutout (34) and the expansion section (42).

4. The metal spiral wound gasket according to claim 2, characterized in that: The notch (51) is arranged obliquely; after the metal strip (3) is inserted into the notch (51), the notch (51) is narrowed to clamp the metal strip (3); the metal strip (3) and the non-metal strip (4) are alternately stacked in the space (6), and the metal strip (3) is bent near the notch (51); the degree of inclination of the notch (51) is related to the bending angle of the metal strip (3).

5. The metal spiral wound gasket according to claim 4, characterized in that: Guide blocks (52) are respectively arranged on the outer ring (1) and the inner ring (2) near the notch (51); the guide blocks (52) extend along the bending position of the metal belt (3) and fill the space (6).

6. The metal spiral wound gasket according to claim 2, characterized in that: A woven mesh belt (8) is arranged along the non-metallic belt (4); mesh wires (81) are formed on both sides of the mesh belt (8); the mesh wires (81) extend along the expansion section (42) and pull the expansion section (42).

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