Dry gas sealing structure of vein-shaped bionic groove

Abstract

The dry gas sealing structure of the vein-shaped bionic groove comprises a movable ring and a static ring which are matched with each other, and a sealing end face is arranged on the movable ring; a plurality of dynamic pressure grooves are evenly engraved in the sealing end face of the movable ring in the circumferential direction, the inlet side of the end face of the movable ring is a high-pressure side, the other side of the end face of the movable ring is a low-pressure side, the opening position of each dynamic pressure groove is located on the high-pressure side of the end face of the movable ring, each dynamic pressure groove comprises a vein-shaped bionic groove distributed in the circumferential direction, and each vein-shaped bionic groove comprises a main vein and side veins divided into two sides from the main vein. In the operation process of the vein-shaped bionic groove, fluid flows into the dynamic pressure groove through an inlet of the dynamic pressure groove and is extruded by the dynamic pressure groove to form a high-pressure area at the main vein, so that the static ring is opened, the sealing effect is formed, the fluid is blocked at the main vein of the vein-shaped bionic groove, the dynamic pressure effect of the fluid is enhanced, and the sealing effect of the fluid is improved. Meanwhile, part of fluid flows into the low-pressure side pulse, the working medium leakage amount is reduced, the abrasion degree of a sealing piece is weakened, and the service life of the sealing device is prolonged.

Description

Technical Field

[0001] The invention relates to a shaft end sealing device in the fluid machinery industry, in particular to a dry gas sealing structure of a leaf vein-shaped bionic groove, and belongs to the technical field of shaft end dry gas sealing of rotating machinery. Background Art

[0002] Compressors and turbines are important components of supercritical carbon dioxide cycle power generation systems, and their operating performance directly affects the system cycle efficiency. As an important component of rotating machinery, seals are mainly used to control the leakage flow of high-pressure working fluids in the dynamic and static gaps. The leakage rate not only affects the system efficiency, but also may pose a threat to the stability and safety of the equipment. The sealing problem of rotating machinery in supercritical carbon dioxide cycle power generation systems has always been a complex and critical issue. Through material optimization, structural design optimization and other means, the sealing performance can be effectively improved to ensure the stable and efficient operation of the system. At the same time, the thermophysical properties of carbon dioxide near the critical point have nonlinear and drastic changes, which increases the difficulty of leakage rate prediction and structural design of supercritical carbon dioxide sealing systems. The leakage rate of labyrinth seals is large, which may reach several percent; the pressure resistance of mechanical seals is weak, and the pressure of supercritical carbon dioxide can reach 20MPa, so mechanical seals are no longer applicable. In view of the severe working conditions of rotating machinery in supercritical carbon dioxide cycle power generation systems, such as high temperature, high pressure and high speed, and considering the operating stability and working fluid leakage, dry gas seals have become the most suitable sealing devices for supercritical carbon dioxide rotating machinery due to their advantages such as small leakage and strong pressure resistance.

[0003] When the dry gas seal is in operation, a very thin air film will be formed between the dynamic ring and the static ring, making the two in a non-contact state. This non-contact design greatly reduces the wear of the sealing surface and prolongs the service life of the seal. Due to the existence of the air film, the dry gas seal can achieve extremely high sealing performance and effectively prevent medium leakage. At the same time, since the sealing surfaces are not in direct contact, the influence of heat and wear particles generated by friction on the sealing performance is also avoided. The dry gas seal has a strong adaptability to changes in parameters such as speed, temperature and medium pressure. In a wide range of speeds, the dry gas seal can maintain good sealing performance. Since there is no direct contact between the dynamic ring and the static ring, the energy loss caused by friction is reduced, thereby reducing power consumption. In the actual operation process, the dry gas seal ring is affected by the temperature and pressure of the fluid, which may cause thermal deformation, affecting the stable and safe operation of the dry gas seal. The temperature characteristics of the dry gas seal and the deformation degree of the dynamic and static rings have become the core of the dry gas seal technology. The shape and size of the dynamic pressure groove will directly affect the sealing effect.

[0004] At present, the most widely used dynamic pressure grooves for dry gas seals are logarithmic spiral grooves and T-shaped grooves. As the power of the circulating power generation system continues to expand, higher requirements are placed on the sealing performance of dry gas seals. In order to improve the economic benefits of the entire system and reduce the leakage of circulating working fluids, the existing dry gas seal structure cannot fully meet the requirements of large-scale circulating power generation systems, and a new sealing groove type is needed to further reduce the leakage rate. Summary of the invention

[0005] In view of the problems of insufficient pneumatic capacity and weak heat dissipation capacity of dry gas seals in the prior art, the purpose of the present invention is to propose a dry gas sealing structure with a leaf-vein-shaped bionic groove, which can ensure the stability of the dry gas seal during operation, while reducing leakage, reducing the degree of wear and extending the service life.

[0006] To achieve the above object, the present invention is implemented through the following technical solutions:

[0007] A dry gas sealing structure with a leaf vein-shaped bionic groove comprises a matching dynamic ring and a static ring. A plurality of dynamic pressure grooves are evenly arranged along the circumferential direction on the sealing end face of the dynamic ring. The inlet side of the sealing end face is the high-pressure side, and the other side is the low-pressure side. The opening position of the dynamic pressure groove is located on the high-pressure side of the sealing end face. The dynamic pressure groove comprises a leaf vein-shaped bionic groove evenly distributed along the circumferential direction. The leaf vein-shaped bionic groove comprises a main vein and a high-pressure side vein and a low-pressure side vein branched from the main vein.

[0008] A further improvement of the present invention is that the angle α between the high-pressure side vein and the low-pressure side vein and the main vein is between 45° and 90°.

[0009] A further improvement of the present invention is that the high-pressure side veins and the low-pressure side veins are alternately arranged on both sides of the main vein, and the total number of the high-pressure side veins and the low-pressure side veins is 20 to 100.

[0010] A further improvement of the present invention is that the ratio of the length of the high-pressure side vein to the length of the low-pressure side vein in the radial direction is in the range of 0.8≤(r o -r1) / (r2-r g )≤1.2, wherein the outer diameter of the moving ring is r o The outer diameter of the main pulse of the moving ring is r1, the inner diameter of the main pulse of the moving ring is r2, and the inner diameter of the low-pressure side pulse of the moving ring is r g The length ratio of the high-pressure side vein to the low-pressure side vein in the radial direction is (r o -r1) / (r2-r g ).

[0011] A further improvement of the present invention is that the depth of the leaf vein-shaped bionic groove is 1 to 50 μm.

[0012] A further improvement of the present invention is that, on the dynamic ring sealing end surface, a sealing dam is formed between the bottom of the low-pressure side pulse of the dynamic pressure groove and the inner diameter of the dynamic ring.

[0013] A further improvement of the present invention is that a pressure stabilizing groove is provided on the sealing dam.

[0014] A further improvement of the present invention is that the cross section of the voltage-stabilizing groove is sawtooth-shaped, the depth of the voltage-stabilizing groove is 0.5-50 μm, and is always no greater than the depth of the leaf-vein-shaped bionic groove.

[0015] A further improvement of the present invention is that the radial width of the voltage-stabilizing groove is 0.5 to 5 mm.

[0016] A further improvement of the present invention is that the number of teeth N of the voltage stabilizing groove is d The value range is: 2≤N d ≤10, sawtooth depth h d0 The value range is 0.2h d ≤h d0 ≤0.6h d ,h d is the depth of the voltage stabilizing tank.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] In the present invention, the dynamic ring moves with the rotating mechanical shaft during the startup process. Under the shearing action of the sealing end face and the fluid, the fluid flows through the high-pressure side pulse and enters the main pulse. The main pulse is squeezed by the root of the dynamic pressure groove to form a high-pressure area. When the pressure reaches a certain level, the fluid squeezes the static ring and forms a layer of continuous and stable flowing film between the dynamic ring and the static ring to support the dynamic ring and the static ring; at the same time, the dynamic ring and the static ring are kept non-contact, so that the sealing end face will not be worn. The fluid on the high-pressure side of the dynamic pressure groove flows into the dynamic pressure groove, which plays a role in sealing the fluid overflowing from the shaft. The leaf vein-shaped bionic groove adopted in the present invention has a smooth curve, avoids the sharp structure of the groove type such as the T-slot, and enhances the fluid flow characteristics. In the present invention, a unique leaf vein-shaped bionic groove structure is set on the sealing end face, and the high-pressure side vein is evenly opened to ensure that more fluid is sucked in, and the wear of the end face is reduced during operation. It is suitable for high-condition sealing, realizes non-contact and wear resistance of the sealing end face, prolongs the service life, and improves the reliability of the seal.

[0019] Furthermore, since the high-pressure side pulses and the low-pressure side pulses are distributed on both sides of the main pulse and are evenly arranged circumferentially on the sealing end face, the flow field formed is more stable. When the static ring is deflected during operation, the deflection angle of the static ring is controlled by the action force of the film itself and the supporting force behind the static ring, thereby maintaining a stable operating state.

[0020] Furthermore, after the fluid is squeezed by the main pulse geometric structure in the dynamic pressure groove, the pressure increases, thereby squeezing the static ring to form a fluid film. After the fluid flows out from the low-pressure side pulse, it will generate force in the axial direction. A pressure stabilizing groove is set at the sealing dam so that part of the outflowing fluid flows into the pressure stabilizing groove, which is convenient for the flow field to stabilize. At the same time, the hot fluid will cause thermal deformation to the dynamic ring and the static ring, affecting the sealing performance. The pressure stabilizing groove is set on the sealing end face to help enhance the heat dissipation of the sealing end face, thereby reducing the thermal wear of the sealing end face. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments. The following drawings are used to provide a further understanding of the present invention, constitute a part of this application, and do not constitute a limitation of the present invention. In the drawings:

[0022] Figure 1 It is a perspective view of the dynamic and static rings of Example 1 of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of the dynamic ring in Example 1 of the present invention;

[0024] Figure 3 Schematic diagram of the cross-sectional structure of the moving ring MM in Example 1 of the present invention;

[0025] Figure 4 It is a perspective view of the dynamic and static rings of Example 2 of the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of the dynamic ring in Example 2 of the present invention;

[0027] Description of reference numerals:

[0028] 1—dynamic ring; 2—static ring; 3—main vein; 4—high-pressure side vein; 5—low-pressure side vein; 6—sealing dam; 7—pressure stabilizing groove. DETAILED DESCRIPTION

[0029] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0030] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0035] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0036] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0037] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0038] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0039] In order to solve the problems of insufficient pneumatic capacity and weak heat dissipation capacity of dry gas seals in the prior art, the present invention proposes a dry gas sealing structure with a leaf-vein-shaped bionic groove, which can ensure the stability of the dry gas seal during operation, while reducing leakage, lowering the degree of wear and extending the service life.

[0040] Example 1

[0041] like Figure 1 and Figure 2 As shown, the present embodiment provides a dry gas sealing structure of a leaf vein-shaped bionic groove, the sealing structure comprising a matching dynamic ring 1 and a static ring 2, the dynamic ring 1 being provided with a sealing end face; a plurality of dynamic pressure grooves are uniformly engraved on the sealing end face of the dynamic ring 1 along the circumferential direction, the inlet side of the dynamic ring end face is the high-pressure side, and the other side is the low-pressure side, the opening position of the dynamic pressure groove is located on the high-pressure side of the dynamic ring end face, the dynamic pressure groove comprises a circumferentially distributed leaf vein-shaped bionic groove, the leaf vein-shaped bionic groove comprises a main vein 3 and side veins on both sides branching out from the main vein.

[0042] The high-pressure lateral vein 4 is located on the high-pressure side of the dynamic ring, and the low-pressure lateral vein 5 is located on the other side of the main vein. The groove depth of the lateral veins on both sides is consistent with the groove depth of the main vein; the angle α between the high-pressure lateral vein 4 and the low-pressure lateral vein 5 and the main vein is between 45° and 90°.

[0043] The high-pressure side veins 4 and the low-pressure side veins 5 of the leaf vein-shaped bionic groove are arranged alternately on both sides of the main vein. The total number of high-pressure side veins and low-pressure side veins N g The depth of the leaf vein-shaped bionic groove is h g 1~50μm.

[0044] See also Figure 2 The outer diameter of the leaf vein bionic groove dynamic ring is r o , inner diameter r i , the outer diameter of the main vein is r1, the inner diameter of the main vein is r2, and the inner diameter of the low-pressure side vein is r g The length ratio of the high-pressure side vein 4 to the low-pressure side vein 5 in the radial direction is (r o -r1) / (r2-r g ), whose value range is 0.8≤(r o -r1) / (r2-r g )≤1.2.

[0045] A sealing dam 6 is provided between the bottom of the low-pressure side pulse 5 of the dynamic pressure groove and the inner diameter of the dynamic ring. A pressure stabilizing groove 7 is provided on the sealing dam 6. The cross section of the pressure stabilizing groove is a sawtooth shape. The depth h of the pressure stabilizing groove 7 is d 0.5~50μm, and never greater than the depth h of the leaf vein-shaped bionic groove g .

[0046] As a preferred embodiment, see Figure 3 When the number of teeth of the leaf vein-shaped bionic groove pressure stabilizing groove 7 is 4, that is, there are 4 teeth in the groove of the pressure stabilizing groove 7. The radial width (r d1 -r d2 ) is 0.5~5mm. After the fluid is squeezed by the geometric structure of the main pulse 3 in the dynamic pressure groove, the pressure increases, thereby squeezing the static ring 2 to form a fluid film. After the fluid flows out from the low-pressure side pulse 5, it will generate force in the axial direction. A pressure stabilizing groove 7 is set at the sealing dam 6, so that part of the outflowing fluid flows into the pressure stabilizing groove 7, which is convenient for the flow field to stabilize. At the same time, the hot fluid will cause thermal deformation to the dynamic ring 1 and the static ring 2, affecting the sealing performance. The pressure stabilizing groove 7 is set on the sealing end face, which helps to enhance the heat dissipation of the sealing end face, thereby reducing the thermal wear of the sealing end face.

[0047] The number of teeth N of the voltage stabilizing groove of the leaf vein-shaped bionic groove d The value range is: 2≤N d ≤10, sawtooth depth h d0 The value range is 0.2h d ≤h d0 ≤0.6h d .

[0048] Example 2

[0049] Reference Figure 4 and Figure 5 As shown, the difference between this embodiment and embodiment 1 is that: the number of high-pressure side veins 4 and low-pressure side veins 5 is reduced, and the angle α between the side veins and the main vein 3 is increased; the number of serrations of the pressure-stabilizing groove 7 is reduced, and the number of serrations in this embodiment is 3, and the remaining structure and implementation method are the same as those in embodiment 1.

[0050] Example 3

[0051] The difference between this embodiment and embodiment 1 is that: the number of high-pressure side veins 4 and low-pressure side veins 5 increases, and the angle α between the side veins and the main vein 3 decreases; the number of serrations of the pressure-stabilizing groove 7 increases, and the number of serrations in this embodiment is 5, and the rest of the structure and implementation method are the same as those in embodiment 1.

[0052] Example 4

[0053] The difference between this embodiment and embodiment 1 is that: the number of high-pressure side veins 4 and low-pressure side veins 5 is reduced, and the angle α between the side veins and the main vein 3 is reduced; the number of serrations of the pressure-stabilizing groove 7 is increased, and the number of serrations in this embodiment is 6, and the rest of the structure and implementation method are the same as those in embodiment 1.

[0054] Example 5

[0055] The difference between this embodiment and embodiment 1 is that: the number of high-pressure side veins 4 and low-pressure side veins 5 increases, and the angle α between the side veins and the main vein 3 decreases; the number of serrations of the pressure-stabilizing groove 7 increases, and the number of serrations in this embodiment is 6, and the rest of the structure and implementation method are the same as those in embodiment 1.

[0056] Preferably, in the present invention, the number of high-pressure side veins 4 and low-pressure side veins 5 can be determined according to actual needs, and the angle α between the side veins and the main vein 3 can be increased or decreased according to actual needs.

[0057] In the present invention, during the startup process, the dynamic ring moves with the rotating mechanical shaft, and the fluid flows through the high-pressure side pulse and enters the main pulse. The main pulse is squeezed by the root of the dynamic pressure groove to form a high-pressure area. When the pressure reaches a certain level, the fluid squeezes the static ring and forms a continuous and stable flowing film between the dynamic ring and the static ring to support the dynamic ring and the static ring; at the same time, the dynamic ring and the static ring are kept non-contact, so that the sealing end surface will not be worn. The fluid on the high-pressure side of the dynamic pressure groove flows into the dynamic pressure groove, which plays a role in sealing the fluid overflowing from the shaft.

[0058] The leaf vein-shaped bionic groove used in the present invention has a smooth curve, avoids the sharp structure of the T-shaped groove and other groove types, and enhances the fluid flow characteristics. In the present invention, a unique leaf vein-shaped bionic groove structure is arranged on the sealing end face, and the high-pressure side veins are evenly opened to ensure that more fluid is sucked in, and the wear of the end face is reduced during operation. It is suitable for high-operating condition sealing, realizes non-contact and wear resistance of the sealing end face, prolongs the service life, and improves the reliability of the seal.

[0059] The high-pressure side pulses and low-pressure side pulses are distributed on both sides of the main pulse and evenly arranged on the sealing end face along the circumferential direction. The flow field formed is more stable. When the static ring is deflected during operation, the deflection angle of the static ring is controlled by the action force of the film itself and the supporting force behind the static ring, thereby maintaining a stable operating state.

[0060] The leaf vein-shaped bionic groove adopted in the present invention allows the fluid to flow into the dynamic pressure groove through the inlet during operation, and is squeezed by the dynamic pressure groove to form a high-pressure area at the main vein, thereby expanding the static ring and playing a sealing role. The fluid is obstructed at the main vein of the leaf vein bionic groove, thereby enhancing the dynamic pressure effect of the fluid. At the same time, part of the fluid flows into the low-pressure side vein to solve the problems of insufficient pneumatic capacity and weak heat dissipation capacity of dry gas seals in the prior art, while reducing the leakage of working fluid, reducing the wear of the seal, and extending the service life of the sealing device.

[0061] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and disclosure of the invention. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0062] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0063] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A dry gas sealing structure of a leaf vein-shaped bionic groove, characterized in that: The invention comprises a matching dynamic ring (1) and a static ring (2), wherein a plurality of dynamic pressure grooves are evenly arranged along the circumferential direction on the sealing end surface of the dynamic ring (1), the inlet side of the sealing end surface is the high-pressure side, and the other side is the low-pressure side, the opening position of the dynamic pressure groove is located on the high-pressure side of the sealing end surface, the dynamic pressure groove comprises a leaf vein-shaped bionic groove evenly distributed along the circumferential direction, and the leaf vein-shaped bionic groove comprises a main vein (3) and a high-pressure side vein (4) and a low-pressure side vein (5) branching from the main vein.

2. The dry gas sealing structure of the leaf vein-shaped bionic groove according to claim 1 is characterized in that: The angle α between the high-pressure side vein (4) and the low-pressure side vein (5) and the main vein (3) is between 45° and 90°.

3. The dry gas sealing structure of the leaf vein-shaped bionic groove according to claim 1 or 2, characterized in that: The high-pressure side veins (4) and the low-pressure side veins (5) are arranged alternately on both sides of the main vein (3), and the total number of the high-pressure side veins (4) and the low-pressure side veins (5) on one side of the main vein (3) is 20 to 100.

4. The dry gas sealing structure of the leaf vein-shaped bionic groove according to claim 1, characterized in that: The length ratio of the high-pressure side vein to the low-pressure side vein in the radial direction is in the range of 0.8≤(r o -r1) / (r2-r g )≤1.2, wherein the outer diameter of the moving ring is r o The outer diameter of the main pulse of the moving ring is r1, the inner diameter of the main pulse of the moving ring is r2, and the inner diameter of the low-pressure side pulse of the moving ring is r g The length ratio of the high-pressure side vein to the low-pressure side vein in the radial direction is (r o -r1) / (r2-r g ).

5. The dry gas sealing structure of the leaf vein-shaped bionic groove according to claim 1, characterized in that: The depth of the leaf vein-shaped bionic groove is 1 to 50 μm.

6. The dry gas sealing structure of the leaf vein-shaped bionic groove according to claim 1, characterized in that: On the sealing end surface of the dynamic ring, a sealing dam (6) is formed between the bottom of the low-pressure side pulse of the dynamic pressure groove and the inner diameter of the dynamic ring.

7. The dry gas sealing structure of the leaf vein-shaped bionic groove according to claim 6 is characterized in that: A pressure stabilizing groove (7) is arranged on the sealing dam.

8. The dry gas sealing structure of the leaf vein-shaped bionic groove according to claim 7, characterized in that: The cross section of the voltage stabilizing groove (7) is sawtooth-shaped, and the depth of the voltage stabilizing groove (7) is 0.5 to 50 μm, and is always no greater than the depth of the leaf vein-shaped bionic groove.

9. The dry gas sealing structure of the leaf vein-shaped bionic groove according to claim 7, characterized in that: The radial width of the voltage-stabilizing groove (7) is 0.5 to 5 mm.

10. The dry gas sealing structure of the leaf vein-shaped bionic groove according to claim 7, characterized in that: The number of teeth of the voltage stabilizing groove (7) is N d The value range is: 2≤N d ≤10, sawtooth depth h d0 The value range is 0.2h d ≤h d0 ≤0.6h d ,h d is the depth of the voltage stabilizing tank.

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