Rotary equipment face seal system

Abstract

The present application relates to the field of machinery, in particular to sealing technology. A rotary device surface ring seal system comprises a partition plate separating two areas, the partition plate is provided with a shaft hole, a rotating shaft passes through the shaft hole to connect a rotating device, and the abutting surface is provided with at least three concentric rotary sealing rings; the partition plate is provided with at least three concentric static sealing rings; the rotating device and the partition plate are inserted and matched through the rotary sealing rings and the static sealing rings; one of the rotary sealing rings is clamped between two adjacent static sealing rings to form a nested relationship; further, the at least three rotary sealing rings and the at least three static sealing rings form a nested relationship; after the rotary sealing rings and the static sealing rings are nested, a gap is formed between the rotary sealing rings and the static sealing rings. The rotating device can be a fan impeller, an air compressor impeller, a compressor impeller or a stirring impeller.

Description

Technical Field

[0001] This invention relates to the field of machinery, and more specifically to sealing technology. Background Technology

[0002] Rotating equipment generally consists of a rotating shaft and rotating components (d). In many types of rotating equipment, the rotating components (d) require gas isolation or gas sealing from the external environment of the rotating shaft. Examples include high-speed fans, air compressors, and mixers.

[0003] For high-speed fans and air compressors, the quality of gas isolation or gas sealing directly determines the energy efficiency and performance of the equipment.

[0004] For industries such as precision chemicals, hazardous chemicals, pharmaceuticals, and food, the quality of gas isolation or gas sealing in equipment directly determines the quality of the products.

[0005] Existing gas isolation or gas sealing technologies mainly include packing seals, labyrinth shaft seals, and magnetic coupling seals.

[0006] Packing seals are not suitable for long-term use and require periodic replacement. They are also unsuitable for use on equipment that operates continuously for extended periods.

[0007] Magnetic couplings are sealed, but have a complex structure, large size, high cost, limited transmission force, and cannot withstand high temperatures.

[0008] Among these seals, the labyrinth seal is relatively common and has relatively ideal overall performance. However, labyrinth seals still have many problems, such as high price, limited lifespan, and serious leakage.

[0009] A sealing system with simple structure, low cost, long service life, and good sealing performance is needed. Summary of the Invention

[0010] The purpose of this invention is to provide a serial gas booster device with a centrifugal rotation mechanism and its accessories to solve at least one of the above-mentioned technical problems.

[0011] The technical problem solved by this invention can be achieved by the following technical solutions: A rotating equipment surface ring sealing system, characterized in that it includes a partition separating two regions, the partition having a shaft hole through which a rotating shaft passes and connects to a rotating device. Rotating components have a surface that is close to the partition plate for mounting; this surface is called the contact surface. With the direction of the rotating device as the front and the direction of the partition as the rear; Sealing rings are provided on both the bonding surface and the partition. A rearward protruding ring is provided behind the mating surface as a sealing ring, called a rotating sealing ring. The center of the rotating sealing ring (the center is a geometric position, not an actual structure) is located on the rotating shaft. A forward-protruding ring is provided in front of the partition as a sealing ring, called a static sealing ring. The center of the static sealing ring (the center is a geometric position, not an actual structure) is located on the rotating shaft. The mating surface is provided with at least three concentric rotating sealing rings; The partition is equipped with at least three concentric static sealing rings; The rotating components and the partition are connected by a rotating sealing ring and a static sealing ring. One of the rotating sealing rings is sandwiched between two adjacent stationary sealing rings, forming a nested relationship; This results in at least three layers of rotating sealing rings forming a nested relationship with at least three layers of stationary sealing rings; After the rotating sealing ring and the static sealing ring are nested, there is a gap between them.

[0012] Rotating components can be fan impellers, air compressor impellers, compressor impellers, or agitator impellers.

[0013] The partition can be a part of the structure in the fan casing, air compressor chamber, compressor chamber, or mixing tank.

[0014] By using nested rotating and stationary sealing rings, the airflow is made to meander and move forward in the gap, consuming kinetic energy as much as possible and reducing the flow velocity to achieve auxiliary sealing.

[0015] Traditional labyrinth seal technology involves placing multiple "rings" axially, relying on the shaft to construct the sealing mechanism. To allow the shaft to be inserted into the seal's bore, multiple grooves are typically created within the bore, using a smooth cylindrical shaft. This necessitates a very small clearance between the bore and the shaft. This requires highly precise manufacturing processes, resulting in high costs, short lifespan, and susceptibility to vibration damage. Furthermore, air leakage at the shaft is relatively significant, leading to poor sealing performance.

[0016] This invention abandons the traditional technical solution of optical axis matching groove and creatively establishes a surface seal in the radial direction that does not depend on the axis.

[0017] The design employs a nested configuration of a rotating sealing ring and a stationary sealing ring, which offers the following advantages: First, there is no straight-face structure through which gas can pass (such as the traditional optical axis surface), which eliminates the air leakage problem of the optical axis surface and has better sealing performance.

[0018] Secondly, the assembly scheme adopts a plug-in connection, because the protrusion length of the rotating sealing ring and the stationary sealing ring can be much smaller than the length of the traditional labyrinth shaft seal, thus making the installation simpler.

[0019] Third, under the same vibration amplitude and clearance, and with the same tilt angle generated by the shaft, the relative collision between the rotating sealing ring and the stationary sealing ring is less likely and less prone to damage.

[0020] Fourth, because the rotating sealing ring and the static sealing ring are nested, the sealing performance can be achieved or even exceeded that of traditional labyrinth shaft seals with lower fitting precision, making manufacturing simpler and cheaper.

[0021] Therefore, the present invention has the advantages of good airtightness, convenient installation, not easy to be damaged, and low cost. Attached Figure Description

[0022] Figure 1 Overall structural diagram; Figure 2 , one Schematic diagram of the partition structure; Figure 3 , one Schematic diagram of a rotating device structure; Figure 4 , one A cross-sectional view of a rotating device structure with a single-sided flange. Figure 5 , one Cross-sectional view of a rotating device structure with double-sided flanges; Figure 6 A schematic diagram of the assembly using a single-sided flange structure; Figure 7 , one A schematic diagram of the cross-sectional structure of the overall structure; Figure 8 1. Simulation diagram of airflow pressure; Figure 9 Simulation diagram of airflow velocity.

[0023] Partition a, rotating device d, static sealing ring a1, rotating sealing ring d1, gap f, flange e, cavity k, bend v, depression n, grinding layer y, wear-resistant layer m. Detailed Implementation

[0024] To make the above-mentioned objects, features and advantages of the present invention more readily understood, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0025] Reference Figures 1-7 A rotating equipment surface-type ring sealing system, characterized in that it includes a partition plate a separating two regions, the partition plate a having a shaft hole, and a rotating shaft passing through the shaft hole to connect a rotating device d. The rotating device d has a surface that is close to the partition a for mounting, which is called the mating surface; With the direction of the rotating device d as the front and the direction of the partition a as the rear; Sealing rings are provided on both the mating surface and partition a; A rearward protruding ring is provided behind the mating surface as a sealing ring, called the rotating sealing ring d1. The center of the rotating sealing ring d1 (the center is a geometric position, not an actual structure) is located on the rotating shaft. A forward-protruding ring is provided in front of the partition a as a sealing ring, called the static sealing ring a1. The center of the static sealing ring a1 (the center is a geometric position, not an actual structure) is located on the rotating shaft. The mating surface is provided with at least three concentric rotating sealing rings d1; The partition a is provided with at least three concentric static sealing rings a1; The rotating component d and the partition a are connected by a rotating sealing ring d1 and a static sealing ring a1. One of the rotating sealing rings d1 is sandwiched between two adjacent static sealing rings a1, forming a nested relationship; This results in at least three layers of rotating sealing rings d1 forming a nested relationship with at least three layers of static sealing rings a1; After the rotating sealing ring d1 and the static sealing ring a1 are nested, there is a gap between them.

[0026] The rotating component d can be a fan impeller, an air compressor impeller, a compressor impeller, or an agitator impeller.

[0027] Partition a can be a part of the structure in the fan casing, air compressor chamber, compressor chamber, or mixing tank.

[0028] By using the nested rotating sealing ring d1 and the static sealing ring a1, the airflow is made to meander and move forward in the gap, so as to consume kinetic energy and reduce the flow velocity, thereby achieving auxiliary sealing.

[0029] Traditional labyrinth seal technology involves placing multiple "rings" axially, relying on the shaft to construct the sealing mechanism. To allow the shaft to be inserted into the seal's bore, multiple grooves are typically created within the bore, using a smooth cylindrical shaft. This necessitates a very small clearance between the bore and the shaft. This requires highly precise manufacturing processes, resulting in high costs, short lifespan, and susceptibility to vibration damage. Furthermore, air leakage at the shaft is relatively significant, leading to poor sealing performance.

[0030] This invention abandons the traditional technical solution of optical axis matching groove and creatively establishes a surface seal in the radial direction that does not depend on the axis.

[0031] The design employs a nested configuration of rotating sealing ring d1 and static sealing ring a1, which has the following advantages: First, there is no straight-face structure through which gas can pass (such as the traditional optical axis surface), which eliminates the air leakage problem of the optical axis surface and has better sealing performance.

[0032] Secondly, an assembly scheme using a plug-in connection is adopted, because the protrusion length of the rotating sealing ring d1 and the static sealing ring a1 can be much smaller than the length of the traditional labyrinth shaft seal, thus making installation simpler.

[0033] Third, under the same vibration amplitude and clearance, and with the same tilt angle generated by the shaft, the relative collision between the rotating sealing ring d1 and the static sealing ring a1 is less likely and less prone to damage.

[0034] Fourth, because the rotating sealing ring d1 and the static sealing ring a1 are nested, the sealing performance can reach or even exceed that of traditional labyrinth shaft seals with lower fitting precision, making manufacturing simpler and cheaper.

[0035] Therefore, the present invention has the advantages of good airtightness, convenient installation, not easy to be damaged, and low cost.

[0036] There are at least three annular cavities k arranged from the inside out (from the axis outward); At least three annular cavities with increasing radii (k) are arranged concentrically to form a nested structure. The annular cavity k is formed by the structure on the partition a and the structure on the rotating device d; The two adjacent cavities k are connected by a gap f between the structure on the partition a and the structure on the rotating device d; Furthermore, the volume of the annular cavity k increases from the inside out (from the axis outwards).

[0037] Preferably, the radius of the outermost annular cavity k is greater than three times the radius of the innermost annular cavity k.

[0038] This invention improves sealing performance by creating nested, progressively increasing cavities k. This design is completely different from the equal-volume groove design mechanism of labyrinth seals. The sealing performance of this mechanism is far superior to that of labyrinth seals.

[0039] For example, the pressure at the shaft hole of the rotating equipment surface ring sealing system is 10 atmospheres, and the diameter of the cavity k is 1cm; the diameter of the outermost annular cavity k is 50cm; assume that the cross-sectional area of ​​the several annular cavities k is the same.

[0040] Furthermore, because the amount of gas flowing out of the surface ring seal system of the rotating equipment is fixed and uniform both inside and outside, the pressure in the cavity k of the outermost ring is reduced to 2%, or 0.2 atmospheres. Under this low pressure, the gas becomes extremely easy to seal.

[0041] Although the above calculations simplify and ignore multi-layer relationships, gas accumulation, and flow, the logical relationship of improving reaction sealing performance can be relatively intuitively analyzed through simplified analysis.

[0042] Furthermore, at least eight layers of the aforementioned rotating sealing rings d1 are provided, forming a nested relationship with at least eight layers of static sealing rings a1.

[0043] This is beneficial for achieving sealing performance while reducing precision.

[0044] It should be noted that the present invention uses a radial arrangement of the sealing rings, rather than an axial arrangement. This allows for a much greater spatial length for the arrangement.

[0045] For example, without increasing the size of the equipment, a rotating surface ring sealing system with a diameter of 100cm or more can be installed on the back of a 120cm diameter impeller.

[0046] Traditional labyrinth shaft seals require a length of 100cm, which necessitates increasing the equipment length by at least 100cm, making it unacceptable in both mechanical design and practical use, and therefore impractical.

[0047] At least one of the rotating sealing ring d1 and the stationary sealing ring a1 has a flange e at its end; After the rotating sealing ring d1 and the static sealing ring a1 are inserted and fitted, the flange e and the surrounding structure form an annular cavity k.

[0048] This invention does not achieve sealing by simply increasing the length of the airflow path, but rather establishes a cavity k, through which the airflow is frequently depressurized and re-entered for pressurization, thereby achieving frequent depressurization and pressurization fluctuations as it moves forward, thus consuming airflow energy and slowing it down, and optimizing the sealing (including airtightness and isolation) effect.

[0049] The cavity k is not formed by the traditional groove method of the labyrinth shaft seal, but by inserting and then using the flange e to cooperate with the surrounding structure, which is easier to build, lower in cost, and easier to clean and maintain after disassembly.

[0050] In this invention, cavity k is used as a container for gaseous impurities.

[0051] It intercepts impurities and particles in the airflow, protecting equipment and reducing energy consumption.

[0052] After the rotating sealing ring d1 and the static sealing ring a1 are nested, the flange e forms a gap f on one side of the end face and a cavity k on the other side of the flange e. This leads to the formation of a gas expansion structure from the slit f to the cavity k, and a gas compression structure from the cavity k to the next slit f.

[0053] To achieve greater airflow energy loss and restrict airflow.

[0054] The gap f is the gap formed between the face of the flange e and the opposite mating surface or partition a.

[0055] For example, the flange e is set on the static sealing ring a1, and a gap is formed between the side of the flange e away from the partition a and the mating surface, which serves as a gap f for gas flow.

[0056] Furthermore, based on the fit between the gap f and the cavity k, the flange e can be used to achieve a meandering turbulent flow of air between the rotating sealing ring d1 and the stationary sealing ring a1, causing the high-speed airflow to impact the low-speed airflow in the opposite direction, reducing the airflow energy and greatly enhancing the sealing performance.

[0057] In addition, with the traditional labyrinth shaft seal, the inlet and outlet are in the same location, resulting in less airflow turbulence within the groove.

[0058] In this invention, the air inlet and outlet of the cavity k are two separate locations. The airflow passes through the cavity k and achieves a meandering turbulent flow of the airflow between the rotating sealing ring d1 and the stationary sealing ring a1 through the flange e. This causes the high-speed airflow to impact the low-speed airflow in the opposite direction, reducing the airflow energy. Compared with the groove of the traditional labyrinth shaft seal, this greatly enhances the sealing performance.

[0059] The flanged e-structure, combined with the multi-layered cavity k-structure with gradually increasing volume, enhances the sealing performance.

[0060] The cavity is nested in layers, with at least two cavities k whose volume increases from the inside out (from the axis outward). The increase in volume enhances the pressure difference between two adjacent cavities k, thereby increasing the airflow velocity between the two adjacent cavities k, which in turn enhances the turbulence caused by the flange e and improves the sealing effect.

[0061] The rotating sealing ring d1 and the stationary sealing ring a1 have an overlapping area in the convex direction; In the rotating sealing ring d1 and the static sealing ring a1, at least one of them is provided with a flange e at its end, and the end of the other extends beyond the flange e, so that the overlapping area crosses the side of the flange e near the root and forms a cavity k. The flange e is located on the side of the end near the higher pressure area.

[0062] For example, in a working condition where the pressure on the side of the shaft is higher than that on another side, the flange e is located on the side closer to the shaft.

[0063] The airflow flowing out in the direction of rotation passes through the gap j of the end face of the adjacent sealing ring, which is closer to the direction of rotation. It has strong pressure and impacts the support structure of the flange e (the sealing ring in which it is located) more. Then it rotates back and flows out again through the gap f of the end face of the flange e after turning.

[0064] This design is particularly advantageous for restricting airflow in the direction of rotation. This design allows the airflow flowing out in the direction of rotation to impact the root structure of the flange e more, and then, after turning, it turns again and flows out from the end (end face) gap f of the flange e.

[0065] This invention features a specially designed multi-stage forced airflow reversal mechanism, forming a larger number of turbulent structures and multiple airflow rotation and convection structures, which greatly improves the sealing performance.

[0066] Of the rotating sealing ring d1 and the stationary sealing ring a1, at least one of the sealing rings has a flange e at its end; The flange e has a bend v in the extension of the surface inside the cavity k, which is directed toward the root of the sealing ring.

[0067] When a velocity-carrying airflow passes over the flange e, it is affected by the bending v and deflects in the direction of the bend, that is, in the direction away from the gap f below. This restricts its own flow velocity and the flow velocity of other surrounding airflows, thereby enhancing the sealing performance.

[0068] Of the rotating sealing ring d1 and the stationary sealing ring a1, at least one has a flange e at its end; the other has a recess n at its end.

[0069] Additional small gas expansion structures are formed by the indentation n.

[0070] It helps to enhance sealing performance.

[0071] Furthermore, at least one of the rotating sealing ring d1 and the static sealing ring a1 has two flanges e at its end.

[0072] It creates more meandering turbulence, more gas expansion structures and gas compression structures at once, causing high-speed airflow to impact low-speed airflow in the opposite direction, reducing airflow energy and greatly enhancing sealing performance.

[0073] The flange e is provided on the static sealing ring a1.

[0074] This eliminates the need for the flange e structure to rotate, thereby making the structure with flange e more stable and ensuring overall reliability.

[0075] The rotating sealing ring d1 and the stationary sealing ring a1 are in a non-contact relationship.

[0076] Avoid surface friction and reduce energy consumption.

[0077] After the rotating sealing ring d1 and the static sealing ring a1 are nested, the flange e forms a gap f on one side of the end face. The width of the gap f is less than 1.5 mm and greater than 0.1 mm.

[0078] Traditional labyrinth seals require a gap (f) of 0.01 mm, but their sealing performance remains limited. This patent achieves or even surpasses the sealing performance of traditional labyrinth seals by increasing the gap f by 10 times or even 100 times.

[0079] It has lower manufacturing precision requirements, lower manufacturing costs, higher reliability, lower operating costs, better performance, and longer lifespan.

[0080] The width of the flange e on one side is greater than 5 times the width of the gap f.

[0081] This allows the cavity k to have a larger relative expansion space.

[0082] From the perspective of the cross section, the overlapping length of the rotating sealing ring d1 and the static sealing ring a1 is greater than 3 times the width of the gap f.

[0083] This allows the cavity k to have a larger relative expansion space.

[0084] From a cross-sectional perspective, the overlapping length of the rotating sealing ring d1 and the static sealing ring a1 is less than 50 times the width of the gap f.

[0085] To avoid collisions caused by excessive length, reduce processing difficulty, and increase lifespan.

[0086] Reference Figure 8 , 9 With a gap size f of 0.5 mm and a pressure of 0.1 MPa, the airflow velocity at the edge is essentially zero. Overall, there is virtually no air leakage.

[0087] When the adjacent rotating sealing ring d1 and static sealing ring a1 are nested, the gap between adjacent edges (including the flange e) is 0.1~0.8mm.

[0088] It avoids shaking and collisions, and reduces processing difficulty and increases lifespan.

[0089] After the two types of sealing rings (static sealing ring a1 and rotating sealing ring d1) are inserted, they have relatively rotating annular surfaces at their respective ends. At least one of the sealing rings has an abrasive layer y that serves a grinding function and an easily worn layer m that is easy to wear on its end and corresponding annular surface, respectively. The protrusion length of the sealing ring is sufficient. After the partition a and the rotating device d are pressed together, the grinding layer y comes into contact with the wear-prone layer m.

[0090] Press the partition plate a and the rotating device d to bring the grinding layer y and the easy-to-grind layer m into contact, and make the two rotate relative to each other to perform grinding until the grinding is smooth.

[0091] In traditional labyrinth seal technology, the fit between the shaft and the labyrinth is achieved through precision manufacturing. Although this is costly and difficult to manufacture, achieving a precise fit remains challenging.

[0092] This invention creatively employs a grinding and mating technique for gap f. Grinding naturally stops after the grinding layer y and the easily worn layer m can no longer touch. Without undergoing precision manufacturing, the resulting gap f can be smaller than that of a traditional labyrinth shaft seal.

[0093] An elastic layer is also provided underneath the wear-prone layer m. The elastic layer gives the wear-prone layer m a certain degree of floating characteristics, so that the grinding layer y and the wear-prone layer m are in a floating contact state.

[0094] The elasticity range of the elastic layer is sufficient to allow the clamping partition a and the rotating device d to be locked, and to press the grinding layer y and the wear-resistant layer m together.

[0095] This design allows the clamping partition a and the rotating device d to be locked first, then ground. Reassembly after grinding is unnecessary. This simplifies the structure, the manufacturing process, and, due to the absence of secondary disassembly, results in higher precision and better sealing performance.

[0096] The cavity k of the flange e is used as the cavity for receiving the fragments of the easily worn layer m.

[0097] With the cavity k of this invention, simply using grinding technology leaves no place for the easily ground material m to be disposed of, significantly reducing the effectiveness. This invention creatively sets up the cavity k as a receiving cavity for the material, making the equipment operate more smoothly.

[0098] The wear-resistant layer m can be made of materials that are easily worn, such as plastic, clay, adhesive structure, or aluminum.

[0099] The preferred wear layer m is a graphite layer.

[0100] It combines the characteristics of being easily worn, corrosion resistant, and having low resistance.

[0101] The elastic layer is preferably a Teflon layer.

[0102] It also possesses micro-elasticity and corrosion resistance, and its moderate hardness allows it to adequately resist airflow and pressure.

[0103] Alternatively, the wear layer m can be made of elastic wear layer m.

[0104] This technology achieves the effect of stacking an elastic layer and a wear-resistant layer through a single structure.

[0105] The elastic, wear-resistant layer m can be made of foamed plastics, such as foamed rubber or foamed resin.

[0106] Preferably, the wear-resistant layer m is disposed at the end of the sealing ring, as follows.

[0107] The partition a has an annular surface between two adjacent static sealing rings a1, which is called the annular surface of partition a; The two adjacent rotating sealing rings d1 of the mating surface have an annular surface, which is called the mating annular surface; At least one of the annular surface of the partition a and the annular surface of the mating has an abrasive layer y that serves to abrade; At least one of the static sealing ring a1 and the rotating sealing ring d1 has a wear-prone layer m at its end.

[0108] The grinding-type sealing mechanism is characterized by comprising a partition a separating two regions, the partition a having a shaft hole, and a rotating component d passing through the shaft hole. The rotating device d has a surface that is close to the partition a for mounting, which is called the mating surface; With the direction of the rotating device d as the front and the direction of the partition a as the rear; On the mating surface and the partition a, one of them is provided with a raised sealing ring, and the other is provided with an annular groove to accommodate the sealing ring; The centers of the sealing ring and the annular groove (the centers are geometric locations, not actual structures) are both located on the rotating shaft; The sealing ring and the annular groove are inserted into each other. In the sealing ring and the annular groove, one has an abrasive layer y that serves to grind, and the other has a wear-resistant layer m that is worn away. The protrusion length of the sealing ring is sufficient. After the partition a and the rotating device d are pressed together, the grinding layer y comes into contact with the wear-prone layer m.

[0109] One approach is to create two raised sealing rings, with the gap between the two raised sealing rings forming an annular groove.

[0110] For example, a raised sealing ring is constructed on the mating surface, and an annular groove is constructed on partition a. The annular groove of partition a is formed by the gap between two raised sealing rings constructed on partition a.

[0111] The wear-resistant layer m can be made of materials that are easily worn, such as plastic, clay, adhesive structure, or aluminum.

[0112] The preferred wear layer m is a graphite layer.

[0113] It combines the characteristics of being easily worn, corrosion resistant, and having low resistance.

[0114] The elastic layer is preferably a Teflon layer.

[0115] It also possesses micro-elasticity and corrosion resistance, and its moderate hardness allows it to adequately resist airflow and pressure.

[0116] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A rotating equipment surface ring sealing system, characterized in that, Includes a partition a that separates two areas, partition a having a shaft hole, through which a rotating shaft passes and connects to a rotating device d; The rotating device d has a surface that is close to the partition a for mounting, which is called the mating surface; With the direction of the rotating device d as the front and the direction of the partition a as the rear; Sealing rings are provided on both the mating surface and partition a; A rearward protruding ring is provided behind the mating surface as a sealing ring, called the rotating sealing ring d1, and the center of the rotating sealing ring d1 is located on the rotating shaft. A forward-protruding ring is provided in front of the partition a as a sealing ring, called the static sealing ring a1, and the center of the static sealing ring a1 is located on the rotating shaft; The mating surface is provided with at least three concentric rotating sealing rings d1; The partition a is provided with at least three concentric static sealing rings a1; The rotating component d and the partition a are connected by a rotating sealing ring d1 and a static sealing ring a1. One of the rotating sealing rings d1 is sandwiched between two adjacent static sealing rings a1, forming a nested relationship; This results in at least three layers of rotating sealing rings d1 forming a nested relationship with at least three layers of static sealing rings a1; After the rotating sealing ring d1 and the static sealing ring a1 are nested, there is a gap between them.

2. The rotating equipment surface ring sealing system according to claim 1, characterized in that, It has at least three annular cavities k arranged from the inside out; At least three annular cavities with increasing radii (k) are arranged concentrically to form a nested structure. The annular cavity k is formed by the structure on the partition a and the structure on the rotating device d; The two adjacent cavities k are connected by a gap f between the structure on the partition a and the structure on the rotating device d; Furthermore, the volume of the annular cavity k increases from the inside out.

3. The rotating equipment surface ring sealing system according to claim 2, characterized in that, The radius of the outermost annular cavity k is more than three times the radius of the innermost annular cavity k.

4. The rotating equipment surface ring sealing system according to claim 1, characterized in that, At least eight layers of the rotating sealing ring d1 are provided, forming a nested relationship with at least eight layers of static sealing ring a1.

5. The rotating equipment surface ring sealing system according to claim 1, characterized in that, At least one of the rotating sealing ring d1 and the stationary sealing ring a1 has a flange e at its end; After the rotating sealing ring d1 and the static sealing ring a1 are inserted and fitted, the flange e and the surrounding structure form an annular cavity k.

6. The rotating equipment surface ring sealing system according to claim 5, characterized in that, After the rotating sealing ring d1 and the static sealing ring a1 are nested, the flange e forms a gap f on one side of the end face and a cavity k on the other side of the flange e. This leads to the formation of a gas expansion structure from the slit f to the cavity k, and a gas compression structure from the cavity k to the next slit f.

7. The rotating equipment surface ring sealing system according to claim 1, characterized in that, Based on the fit between the gap f and the cavity k, the airflow between the rotating sealing ring d1 and the stationary sealing ring a1 is made to meander and turbulent by the flange e, so that the high-speed airflow impacts the low-speed airflow in the opposite direction, reducing the airflow energy and greatly enhancing the sealing performance.

8. The rotating equipment surface ring sealing system according to claim 1, characterized in that, The air inlet and outlet of cavity k are two separate locations. The airflow passes through cavity k and achieves a meandering turbulent flow between the rotating sealing ring d1 and the stationary sealing ring a1 through the flange e. This causes the high-speed airflow to impact the low-speed airflow in the opposite direction, reducing the airflow energy.

9. The rotating equipment surface ring sealing system according to claim 1, characterized in that, The cavity is nested in layers, with at least two cavities k whose volume increases from the inside to the outside. The increased volume enhances the pressure difference between the two adjacent cavities k, thereby increasing the airflow velocity between the two adjacent cavities k, which in turn enhances the turbulence caused by the flange e and improves the sealing effect.

10. A grinding-type sealing mechanism, characterized in that, This includes a partition a that separates two areas, partition a having a shaft hole through which a rotating shaft passes and connects to a rotating device d. The rotating device d has a surface that is close to the partition a for mounting, which is called the mating surface; With the direction of the rotating device d as the front and the direction of the partition a as the rear; On the mating surface and the partition a, one of them is provided with a raised sealing ring, and the other is provided with an annular groove to accommodate the sealing ring; The centers of the sealing ring and the annular groove are both located on the rotating shaft; The sealing ring and the annular groove are inserted into each other. In the sealing ring and the annular groove, one has an abrasive layer y that serves to grind, and the other has a wear-resistant layer m that is worn away. The protrusion length of the sealing ring is sufficient. After the partition a and the rotating device d are pressed together, the grinding layer y comes into contact with the wear-prone layer m.

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