Large-shaft-diameter multi-layer structure coupled dry gas sealing device

Abstract

The invention belongs to the technical field of fluid mechanical shaft end sealing, and discloses a large-shaft-diameter multi-layer structure coupling dry gas sealing device which comprises a movable ring, a static ring, a rotating shaft and a front-end comb tooth seal. The movable ring seat is sleeved on the outer surface wall of the rotating shaft, the movable ring and the static ring are relatively matched and mounted on the movable ring seat, the static ring seat is mounted behind the static ring, the movable ring seat is arranged on the rotating shaft, the front-end comb tooth seal is arranged on the outer side of the movable ring seat in the radial direction, and the dry gas seal seat is arranged on the outer side of the front-end comb tooth seal in the radial direction; the static ring is provided with multiple stages of static ring sealing end faces, and a sealing gas film is formed between the sealing end faces of the moving ring and the static ring. The rotating shaft rotates to drive the moving ring to rotate, a sealing medium flowing out of the front-end comb tooth seal sequentially flows into the multi-stage dynamic pressure grooves of the moving ring, a multi-stage high-pressure area is formed to extrude the static ring to form a sealing gas film, the effect of sealing a medium side working medium is achieved, the deformation degree of the end face of the moving ring can be effectively reduced, and the rigidity of the sealing gas film is enhanced; when the shaft diameter is large, the size of the dry gas sealing device is reduced, quick starting and stopping of dry gas sealing are achieved, operation and maintenance cost is reduced, and operation stability is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of shaft end sealing of fluid machinery, and particularly relates to a large-diameter multi-layer structure coupled dry gas seal device. BACKGROUND

[0002] In the field of fluid machinery engineering, modern rotating machinery equipment continues to develop towards large-diameter, high-power and extreme operating parameters, which leads to unprecedented technical challenges for the shaft end sealing system. Traditional sealing forms, such as labyrinth seal, packing seal and other contact type mechanical seals, are limited by inherent defects, rely on solid friction contact, are sensitive to operating conditions, have excessive linear velocity of the outer diameter of the seal at high speed, and are difficult to meet the demand of high parameter working conditions. Especially in high temperature and high pressure and frequent start-stop scenes, traditional seals generally have the bottlenecks of uncontrolled leakage, intensified friction, serious thermal deformation and sharply increased maintenance cost, which seriously restricts the reliability, long-period operation ability and system stability of the equipment.

[0003] Dry gas seal, as a non-contact dynamic pressure lubrication seal, realizes zero friction operation through the micron-level sealing gas film formed by the sealing end face, and theoretically has the advantages of extremely low leakage, no friction loss, small system power consumption and long service life, and has become the mainstream solution for shaft end sealing of high-end rotating machinery. However, engineering practice shows that the conventional dry gas seal has significant limitations under start-stop transient conditions. The dynamic pressure effect is weakened at low speed, which delays the establishment of the gas film, and has the risk of causing instantaneous contact of the sealing end face. Secondly, the accumulation and heat dissipation lag of friction heat may induce local high temperature area, accelerate the thermal elastic deformation of the sealing ring and even cause thermal cracking failure. Thirdly, when the transient pressure fluctuates, the sealing gas film is insufficient in rigidity, which may cause the leakage to exceed the design value and affect the environment. The existing technology alleviates the above problems through groove optimization or material upgrading, but for large-diameter dry gas seals, a new type of dry gas seal device needs to be proposed to ensure the sealing strength under frequent start-stop conditions. SUMMARY

[0004] In view of the deficiency that the existing dry gas seal device cannot guarantee the sealing strength under frequent start-stop conditions, the purpose of the present application is to provide a large-diameter multi-layer structure coupled dry gas seal device, which can effectively reduce the deformation degree of the dynamic ring end face, enhance the rigidity of the sealing gas film, reduce the volume of the dry gas seal device when the large-diameter, realize rapid start-stop of the dry gas seal, ensure the sealing strength when the load frequently changes, reduce the operation and maintenance cost, and improve the operation stability.

[0005] In order to achieve the above purpose, the present application realizes the following technical scheme:

[0006] A large-diameter multi-layer structure coupled dry gas seal device, comprising a dynamic ring, a static ring, a dynamic ring seat, a static ring seat, a rotating shaft, a front end comb seal and a dry gas seal seat.

[0007] The dynamic ring seat is arranged on the outer wall of the rotating shaft, the dynamic ring and the static ring are oppositely arranged on the dynamic ring seat, the static ring seat is arranged behind the static ring, the dynamic ring seat is arranged on the rotating shaft, the front end comb seal is arranged on the outer side of the dynamic ring seat in the radial direction, the dry gas seal seat is arranged on the outer side of the front end comb seal in the radial direction, the dynamic ring, the static ring, the dynamic ring seat and the static ring seat are located on the same straight line with the center of the rotating shaft; a plurality of dynamic ring sealing end faces are arranged on the dynamic ring, a plurality of static ring sealing end faces are arranged on the static ring, and the sealing end faces of the dynamic ring and the static ring form a sealing gas film.

[0008] Further, the number n of the dynamic ring sealing end faces is 1-10, the dynamic ring sealing end face close to the rotating shaft is the first stage, and the number increases in turn with the increase of the radius in the radial direction.

[0009] Further, the static ring sealing end face and the dynamic ring sealing end face are matched with each other in the axial direction.

[0010] Further, it further comprises a static ring pushing ring, the static ring seat is arranged behind the static ring through the spring and the static ring pushing ring, and the static ring pushing ring is attached to the back of the static ring.

[0011] Further, it further comprises a shaft sleeve pressing member, and the shaft sleeve pressing member and the dynamic ring seat are oppositely arranged on the rotating shaft.

[0012] Further, the dynamic ring sealing end face has an included angle α q in the radial direction, and the maximum value of the included angle α q is 0°-45°, q=1, 2, 3..., n, and q represents the number of the sealing end faces.

[0013] Further, the dynamic ring sealing end face is provided with a dynamic pressure groove.

[0014] Further, the dynamic pressure grooves are uniformly arranged in the circumferential direction, there are a plurality of dynamic pressure grooves on each sealing end face, the dynamic pressure groove has a T-shaped groove, a spiral groove or a tree-shaped groove, the groove depth h gq of the dynamic pressure groove is 1-50 μm, q=1, 2, 3..., n, and q represents the number of the sealing end faces.

[0015] Further, the static ring sealing end face has an included angle β q in the radial direction, and the included angle β q of the static ring sealing end face is equal to the included angle α q of the dynamic ring sealing end face in the radial direction.

[0016] Further, the outer diameter r dmq of each sealing end face is calculated by the following formula:

[0017] r dmq =r ri +(r ro -rri ) / n*q

[0018] wherein, r ri is the inner diameter of the dynamic ring, r ro is the outer diameter of the dynamic ring, q = 1, 2, 3,..., n, q represents the number of sealing end faces, and the outer diameter of the last sealing end face r dmn is equal to the outer diameter of the dynamic ring r ro ;

[0019] The gas film thickness of the sealing gas film is h q , q = 1, 2, 3,..., n, q represents the number of sealing end faces, and h q is 1-100 microns.

[0020] Compared with the prior art, the present application has the beneficial effects of:

[0021] The large-diameter multi-layer structure coupled dry gas seal device of the present application can effectively suppress the concentration and deformation of the end face thermal load, and the pressure gradient distribution mechanism in the sealing end face is more reasonable compared with the traditional single-end-face dry gas seal, and the axial deformation of the end face is effectively reduced. The dynamic ring is provided with a plurality of sealing end faces, the static ring is provided with a sealing end face corresponding to the dynamic ring, the dynamic ring is rotated by the rotation of the shaft, the sealing medium flowing out of the front-end comb seal flows into the plurality of dynamic pressure grooves of the dynamic ring in turn, a plurality of high-pressure areas are formed to squeeze the static ring to form a sealing gas film, the sealing of the medium side working medium is realized, the deformation degree of the end face of the dynamic ring can be effectively reduced, the stiffness of the sealing gas film is enhanced, the volume of the dry gas seal device is reduced when the shaft diameter is large, the dry gas seal can be quickly started and stopped, the sealing strength is ensured when the load frequently changes, the operation and maintenance cost is reduced, and the operation stability is improved. The sealing device in the present application can quickly establish a high-stiffness gas film to eliminate the start-stop contact, significantly accelerate the establishment process of the high-stiffness sealing gas film, and generate a stable gas film with high bearing stiffness in a short time during the starting stage of the dry gas seal, completely eliminate the risk of contact of the sealing end face caused by insufficient dynamic pressure at low speed, and realize zero-wear start-stop.

[0022] Further, when the sealing medium flows through the dynamic pressure grooves with step-by-step pressure reduction, the kinetic energy is converted into controllable pressure energy instead of friction heat energy, and the flow of the sealing medium is guided by the geometric structure of the dynamic pressure grooves, and the temperature field distribution of the sealing end face is optimized.

[0023] Further, in the present application, the plurality of dynamic pressure grooves arranged in the plurality of sealing end faces can maintain precise control of leakage under variable load conditions, and when the system encounters pressure fluctuation or sudden change of rotating speed, the adaptive pressure feedback generated by the plurality of dynamic pressure grooves can better balance the disturbance and control the leakage within a certain range. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of a dry gas sealing device with a large shaft diameter and multi-layer structure coupling according to Embodiment 1 of the present invention;

[0026] Figure 2 This is a cross-sectional view of a dry gas sealing device with a large shaft diameter and multi-layer structure coupling according to Embodiment 1 of the present invention;

[0027] Figure 3 This is a schematic diagram of the dynamic and static ring structures of Embodiment 1 of the present invention;

[0028] Figure 4 This is a schematic diagram of the dynamic ring sealing end face of Embodiment 1 of the present invention;

[0029] Figure 5 This is a schematic diagram of the dynamic ring sealing end face of Embodiment 2 of the present invention;

[0030] Figure 6 The dynamic and static ring edges of Embodiment 2 of the present invention Figure 5 Cross-sectional view of line AA.

[0031] In the diagram, 1. Moving ring; 2. Stationary ring; 3. Moving ring seat; 4. Stationary ring push ring; 5. Stationary ring seat; 6. Rotating shaft; 7. Shaft sleeve clamping part; 8. Spring; 9. Front comb tooth seal; 10. Dry gas seal seat; 11. Dynamic pressure groove. Detailed Implementation

[0032] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0033] In the description of the application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0034] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0035] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection, or communication; it can be directly connected, or indirectly connected through intermediate medium, or the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] In the present application, unless otherwise specifically defined and limited, the first feature "above" or "below" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "above", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0037] It should be understood that when used in the present specification and the appended claims, the terms "include" and "contain" indicate the presence of the described features, whole, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, whole, steps, operations, elements, components and / or sets thereof.

[0038] It should also be understood that the terms used in the specification of the present application are for the purpose of describing particular embodiments only and do not intend to limit the present application. As used in the specification and the appended claims of the present application, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0039] It should be further understood that the term "and / or" used in the specification and the appended claims of the present application means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0040] Various structural diagrams according to the disclosed embodiments of the present application are shown in the accompanying drawings. These drawings are not drawn to scale, in which certain details are exaggerated for the purpose of clarity and certain details can be omitted. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are only exemplary, and in actuality can be deviated due to manufacturing tolerances or technical limitations, and regions / layers with different shapes, sizes and relative positions can be additionally designed by those skilled in the art according to actual needs.

[0041] The embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0042] The large shaft diameter of the present application refers to a dry gas seal with an inner diameter of 400 mm or more.

[0043] Referring to Figure 1 , the large shaft diameter multi-layer structure coupling dry gas seal device of the present application comprises a dynamic ring 1, a static ring 2, a dynamic ring seat 3, a static ring push ring 4, a static ring seat 5, a rotating shaft 6, a shaft sleeve compression member 7, a spring 8, a front end comb seal 9 and a dry gas seal seat 10.

[0044] Among them, the dynamic ring seat 3 is sleeved on the outer wall of the rotating shaft 6, the dynamic ring 1 and the static ring 2 are oppositely installed on the dynamic ring seat 3, the static ring seat 5 is installed behind the static ring 2 through the spring 8 and the static ring push ring 4, and the static ring push ring 4 is tightly attached to the back of the static ring 2 due to the action of the spring 8, the shaft sleeve compression member 7 is oppositely arranged with the dynamic ring seat 3 on the rotating shaft, the front end comb seal 9 is arranged on the outside of the dynamic ring seat 3 in the radial direction, the dry gas seal seat 10 is arranged on the outside of the front end comb seal 9 in the radial direction, and the dynamic ring 1, the static ring 2, the dynamic ring seat 3, the static ring push ring 4, the static ring seat 5 and the rotating shaft 6 are located on the same straight line.

[0045] A plurality of dynamic ring sealing end faces are arranged on the dynamic ring 1, the number n of the dynamic ring sealing end faces is 1-10, the first stage is close to the rotating shaft 6, and the number increases in turn with the increase of the radius in the radial direction.

[0046] Similarly, the stationary ring 2 is provided with multiple stationary ring sealing end faces. The stationary ring sealing end faces and the dynamic ring sealing end faces cooperate with each other in the axial direction, and a sealing gas film is formed between the dynamic and stationary ring sealing end faces.

[0047] See Figure 6 The sealing end face of the dynamic ring has an included angle α in the radial direction. q Angles α at all levels q The maximum value is α, where α ranges from 0° to 45°, and q = 1, 2, 3, ..., n, where q represents the number of sealing end face levels.

[0048] The dynamic ring sealing end face is provided with dynamic pressure grooves 11, which are evenly arranged in the circumferential direction, and the number of dynamic pressure grooves 11 on each sealing end face is n. g The dynamic pressure groove 11 has a groove shape such as a T-shaped groove, a spiral groove, or a tree-shaped groove, and a groove depth h. gq The range is 1 to 50 μm, and q = 1, 2, 3..., n, where q represents the sealing end face level.

[0049] The static ring sealing end face has an included angle β in the radial direction. q The included angle β of the sealing end faces of each level of stationary ring q Angle α with the sealing end face of the rotating ring q equal.

[0050] See Figure 4 and Figure 5 The inner diameter of the moving ring is r ri The outer diameter of the moving ring is r ro The inner diameter of the stationary ring is r si The outer diameter of the stationary ring is r so The outer diameter of each sealing end face is r dmq q = 1, 2, 3..., n, where q represents the sealing end face level, calculated as r dmq =r ri +(r ro -r ri ) / n*q, the root radius of each level of dynamic pressure groove 11 is r gq q = 1, 2, 3, ..., n, where q represents the number of sealing end face stages, and the outer diameter r of the last stage sealing end face is... dmn The outer diameter is equal to the outer diameter r of the moving ring. ro .

[0051] A sealing gas film exists between the rotating ring 1 and the stationary ring 12, and the thickness of each gas film is h. q q = 1, 2, 3..., n, where q represents the number of sealing end face stages, h q The range is 1–100 μm.

[0052] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0053] Example 1

[0054] As Figures 1 to 4 shown, the large shaft diameter multi-layer structure coupled dry gas seal device provided by the embodiment comprises a dynamic ring 1, a static ring 2, a dynamic ring seat 3, a static ring push ring 4, a static ring seat 5, a rotating shaft 6, a shaft sleeve compression member 7, a spring 8, a front end comb seal 9 and a dry gas seal seat 10.

[0055] The dynamic ring seat 3 is sleeved on the outer wall of the rotating shaft 6, the dynamic ring 1 and the static ring 2 are oppositely and cooperatively installed on the dynamic ring seat 3, the static ring seat 5 is installed behind the static ring 2 through the spring 8 and the static ring push ring 4, the static ring push ring 4 is tightly attached to the back of the static ring 2 due to the action of the spring 8, the shaft sleeve compression member 7 is oppositely arranged with the dynamic ring seat 3 on the rotating shaft, the front end comb seal 9 is arranged on the outside of the dynamic ring seat 3 in the radial direction, the dry gas seal seat 10 is arranged on the outside of the front end comb seal in the radial direction, and the dynamic ring 1, the static ring 2, the dynamic ring seat 3, the static ring push ring 4, the static ring seat 5 and the rotating shaft 6 are located on the same central axis.

[0056] In the embodiment 1, a single-stage dynamic ring sealing end face is arranged on the dynamic ring 1, the number of the sealing end face is 1, and a single-stage static ring sealing end face is also arranged on the static ring, the static ring sealing end face and the dynamic ring sealing end face are cooperatively arranged in the axial direction, and a sealing gas film is formed between the dynamic ring sealing end face and the static ring sealing end face.

[0057] In the embodiment 1, the dynamic ring sealing end face has an included angle a1 in the radial direction, a1 = 15°, and the static ring sealing end face also has an included angle b1 in the radial direction, b1 = 15°, which is equal to a1.

[0058] In the embodiment 1, the dynamic ring sealing end face is provided with dynamic pressure grooves, the dynamic pressure grooves are uniformly arranged in the circumferential direction, the number of the dynamic pressure grooves on each sealing end face is n g = 6, the dynamic pressure groove is a T-shaped groove, the groove depth h g1 = 20 μm, and the axial direction is enlarged by 1000 times for observation.

[0059] In the embodiment 1, the inner diameter of the dynamic ring is r ri = 100 mm, the outer diameter is r ro = 120 mm, the inner diameter of the static ring is r si = 100 mm, and the outer diameter is r so = 120 mm, since the embodiment is a single-stage sealing end face, the root radius of the first-stage dynamic pressure groove is 106.6 mm.

[0060] In the embodiment 1, a sealing gas film exists between the dynamic ring 1 and the static ring 2, the thickness of the first-stage gas film is h1 = 50 μm, and the axial direction is enlarged by 1000 times for observation, as Figure 3 shown.

[0061] Example 2

[0062] like Figures 5 to 6 As shown in the figure, this embodiment provides a dry gas sealing device with a large shaft diameter and multi-layer structure coupling. Compared with embodiment 1, in this embodiment 2, the moving ring 1 is provided with 3 levels of moving ring sealing end faces. The first level is near the rotating shaft. In the radial direction, the number of levels increases with the increase of the radius. Similarly, 3 levels of stationary ring sealing end faces are provided on the stationary ring. The stationary ring sealing end faces and the moving ring sealing end faces cooperate with each other in the axial direction, and a sealing gas film is formed between the sealing end faces of the moving ring 1 and the stationary ring 12.

[0063] In this embodiment 2, the sealing end face of the dynamic ring has included angles α1 = 5°, α2 = 10°, and α3 = 15° in the radial direction, and similarly, the sealing end face of the stationary ring has included angle β in the radial direction. q , β1, β2, β3 are equal to α1, α2, α3 respectively, q=1, 2, 3..., n.

[0064] In this embodiment 2, dynamic pressure grooves are provided on the sealing end face of the dynamic ring. The dynamic pressure grooves are evenly arranged in the circumferential direction, and the number of dynamic pressure grooves on each sealing end face is n. g =12, the dynamic pressure groove is a T-shaped groove, and the depth of the dynamic pressure groove is h. g1 =15μm, h g2 =15μm, h g3 =15μm. To facilitate observation, the diameter is enlarged by 1000 times in the axial direction when drawing.

[0065] In this embodiment 2, the inner diameter of the moving ring is r. ri =180mm, outer diameter is r ro =360mm, inner diameter of stationary ring is r si =180mm, outer diameter is r so =360mm, the outer diameter of each sealing end face is r dm1 =240mm, r dm2 =300mm, the root radius r of each level of dynamic pressure groove g1 =210mm, r g2 =270mm, r g3 =330mm. A sealing gas film exists between the dynamic and static rings, with thicknesses of h1 = 50μm, h2 = 50μm, and h3 = 50μm at each stage. For ease of observation, the thickness is magnified 1000 times in the axial direction when drawing. Figure 6 As shown.

[0066] The working process of the large-diameter multilayer structure coupled dry gas seal device is as follows: the dynamic pressure groove 11 is arranged on the dynamic ring 1, when the dry gas seal starts to operate, the sealing medium is mixed with the high-temperature medium flowing through the front-end comb seal 9 to be preliminarily cooled, and then flows into the dynamic ring 1 and the static ring 2, when the dynamic ring 1 and the static ring 2 are filled with the sealing medium, the sealing medium fills the dynamic pressure groove 11 first, and then fills the dynamic pressure grooves of the low-level sealing end surfaces in sequence, when the pressure is sufficient, the static ring 2 is opened to form a stable sealing gas film, and the stable operation of the dry gas seal is ensured. When the rotating speed and other working conditions need to be changed, the multistage sealing end surface structure can effectively ensure the constant stiffness of the dry gas seal in the variable load process. At the same time, by arranging the multistage sealing end surface structure, the degree of thermal elastic deformation of the conventional dry gas seal sealing end surface can be weakened, the end surface thermal load concentration and deformation can be effectively inhibited, and the risk of instability and reliability reduction of the sealing equipment is reduced.

[0067] The multistage sealing end surface is arranged on the dynamic ring, the dynamic ring sealing end surface is engraved with a plurality of dynamic pressure grooves in the circumferential direction, the static ring is provided with a sealing end surface corresponding to the dynamic ring, the dynamic ring is rotated by the rotating shaft, the sealing medium flowing out of the front-end comb seal flows into the multistage dynamic pressure grooves of the dynamic ring in sequence, a plurality of high-pressure areas are formed to push away the static ring to form a sealing gas film, the sealing of the medium side working medium is realized, the deformation degree of the dynamic ring end surface can be effectively reduced, the sealing gas film stiffness can be enhanced, the volume of the dry gas seal device can be reduced when the large-diameter shaft is used, the dry gas seal can be quickly started and stopped, the sealing strength can be ensured when the load frequently changes, the operation and maintenance cost is reduced, and the operation stability is improved.

[0068] The above only describes the best embodiments of the present application, but cannot be understood as a limitation on the claims. The present application is not limited to the above embodiments, and the specific structure allows changes. Any changes made within the protection scope of the independent claims of the present application are within the protection scope of the present application.

[0069] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

Claims

1. A large shaft diameter multilayer structure coupled dry gas seal device, characterized by, The device comprises a dynamic ring (1), a static ring (2), a dynamic ring seat (3), a static ring seat (5), a rotating shaft (6), a front-end comb seal (9) and a dry gas seal seat (10). The dynamic ring seat (3) is sleeved on the outer wall of the rotating shaft (6), the dynamic ring (1) and the static ring (2) are oppositely and cooperatively installed on the dynamic ring seat (3), the static ring seat (5) is installed behind the static ring (2), the dynamic ring seat (3) is arranged on the rotating shaft (6), the front-end comb seal (9) is arranged on the outer side of the dynamic ring seat (3) in the radial direction, the dry gas seal seat (10) is arranged on the outer side of the front-end comb seal (9) in the radial direction, the dynamic ring (1), the static ring (2), the dynamic ring seat (3), the static ring seat (5) and the rotating shaft (6) are located on the same straight line, the dynamic ring (1) is provided with a plurality of dynamic ring sealing end faces, the static ring (2) is provided with a plurality of static ring sealing end faces, and the sealing end faces of the dynamic ring (1) and the static ring (2) form a sealing gas film.

2. The large shaft diameter multilayer structure coupled dry gas seal as recited in claim 1, wherein, The number n of the dynamic ring sealing end faces is 1-10, the dynamic ring sealing end face close to the rotating shaft (6) is the first stage, and the number of stages increases in the radial direction with the increase of the radius.

3. The large shaft diameter multilayer structure coupled dry gas seal of claim 1, wherein, The static ring sealing end face and the dynamic ring sealing end face are cooperatively arranged in the axial direction.

4. The large shaft diameter multilayer structure coupled dry gas seal of claim 1, wherein, The device further comprises a static ring push ring (4), the static ring seat (5) is installed behind the static ring (2) through the spring (8) and the static ring push ring (4), and the static ring push ring (4) is attached to the back of the static ring (2).

5. The large shaft diameter multilayer structure coupled dry gas seal of claim 1, wherein, The device further comprises a shaft sleeve pressing member (7), and the shaft sleeve pressing member (7) and the dynamic ring seat (3) are oppositely arranged on the rotating shaft (6).

6. The large shaft diameter multilayer structure coupled dry gas seal of claim 1, wherein, The sealing end face of the moving ring exists an angle a in the radial direction q The angle a q The maximum is 0°-45°, q=1, 2, 3..., n, q represents the number of sealing end faces.

7. The large shaft diameter multilayer structure coupled dry gas seal of claim 1, wherein, The dynamic ring sealing end face is provided with a dynamic pressure groove (11).

8. The large shaft diameter multilayer structure coupled dry gas seal of claim 7, wherein, The dynamic pressure grooves (11) are arranged uniformly in the circumferential direction, and there are several dynamic pressure grooves (11) on the sealing end face of each stage. The dynamic pressure grooves (11) are T-shaped grooves, spiral grooves or tree-shaped grooves, and the groove depth h of the dynamic pressure grooves (11) is 1-50 μm gq q=1, 2, 3..., n, q represents the number of stages of the sealing end face.

9. The large shaft diameter multilayer structure coupled dry gas seal of claim 7, wherein, The static ring sealing end face exists an included angle β in the radial direction q The static ring sealing end face exists an included angle β in the radial direction q The static ring sealing end face exists an included angle β in the radial direction q The static ring sealing end face exists an included angle β in the radial direction 10. The large shaft diameter multilayer structure coupled dry gas seal of claim 7, wherein, Sealing end face outer diameter r dmq Calculated by the formula: r dmq = r ri + (r ro - r ri ) / n * q wherein r ri is the inner diameter of the dynamic ring, r ro is the outer diameter of the dynamic ring, q = 1, 2, 3..., n, q represents the number of sealing end faces, and the outer diameter of the last sealing end face r dmn is equal to the outer diameter of the dynamic ring r ro ; The thickness of the sealing gas film is h q , q = 1, 2, 3..., n, q represents the number of sealing end faces, h q is 1-100 μm.

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