Dry gas sealing device with scale-shaped bionic groove

Abstract

The embodiment of the invention provides a fish scale-shaped bionic groove dry gas sealing device. The fish scale-shaped bionic groove dry gas sealing device comprises a movable ring, a static ring, a shaft sleeve, a rotating shaft, a static ring O-shaped ring, an annular supporting base, a static ring base and a spring. The two sides of the rotating shaft are sleeved with the shaft sleeve, the movable ring and the static ring are oppositely installed on the shaft sleeve in a matched mode, the static ring base is installed behind the static ring through the spring and the annular supporting base, the annular supporting base is tightly attached to the back face of the static ring due to the action of the spring, and the static ring O-shaped ring is extruded by the annular supporting base and the static ring base. The centers of the moving ring, the shaft sleeve, the static ring, the annular supporting base, the static ring O-shaped ring and the static ring base are located on the same axis. A movable ring sealing end face is arranged on the movable ring, a plurality of movable pressure grooves are formed in the movable ring sealing end face in the circumferential direction, the movable pressure grooves are fish scale-shaped bionic grooves, sealing working media flow into the movable pressure grooves through flow channels between fish scale-shaped bosses, a movable pressure groove high-pressure area is formed due to the hindering effect of the roots of the movable pressure grooves, and therefore the static ring is squeezed open; a sealing film is formed, and the sealing effect is achieved.

Description

Technical Field

[0001] The embodiments of the present disclosure belong to the technical field of rotary machine sealing, and specifically relate to a dry gas sealing device with a fish-scale-shaped bionic groove. Background Art

[0002] As a non-contact shaft end sealing technology, dry gas seals have attracted more and more attention in the field of rotating machinery, especially for turbines and compressors. Under high temperature and high pressure conditions, dry gas seals are widely used in power generation systems at this stage due to their low leakage rate, the ability to use circulating working fluid as sealing gas, and simple structure.

[0003] After the initial ventilation of the dry gas seal, the sealing medium is pumped into the dynamic pressure groove through the entrance of the dynamic pressure groove. When the rotation starts, the sealing medium is compressed due to the extrusion of the dynamic pressure groove to form a high-pressure area, resulting in an increase in the thrust on the static ring. When the thrust on the static ring gradually increases to a level sufficient to counteract the spring force behind the static ring, when the pressure increases again, the static ring will be pushed away, thereby forming a dry gas sealing air film. The formation of the air film, on the one hand, prevents the dynamic and static rings from contacting each other, reducing the wear of the seals, and on the other hand, cools the dynamic and static rings to prevent the seals from being greatly deformed due to excessive temperature, thereby affecting the sealing performance. During actual operation, vibration may occur, which may affect the air film on the sealing end face, and in severe cases, the dynamic and static rings may contact each other. The unit rotates forward during normal operation, but may reverse in accident conditions. The use of a two-way dry gas sealing mechanism can effectively reduce the loss of seals in the reverse condition of accident conditions.

[0004] To this end, it is necessary to develop a non-contact sealing device with strong pneumatic capability and bidirectional rotation to avoid equipment wear caused by vibration during actual operation and ensure the sealing effect. It is necessary to design a dry gas sealing device with a fish-scale-shaped bionic groove. Summary of the invention

[0005] The embodiments of the present disclosure aim to solve at least one of the technical problems existing in the prior art and provide a dry gas sealing device with a fish-scale-shaped bionic groove.

[0006] One aspect of the embodiments of the present disclosure provides a dry gas sealing device with a fish scale-shaped bionic groove, comprising a dynamic ring, a static ring, a shaft sleeve, a rotating shaft, a static ring O-ring, an annular support seat, a static ring seat and a spring;

[0007] The shaft sleeve is sleeved on both sides of the rotating shaft, the dynamic ring and the static ring are installed on the shaft sleeve in a relatively matched manner, the static ring seat is installed behind the static ring through a spring and an annular support seat, and the annular support seat and the back of the static ring are tightly fitted due to the action of the spring, the static ring O-ring is squeezed by the annular support seat and the static ring seat, and the centers of the dynamic ring, shaft sleeve, static ring, annular support seat, static ring O-ring and static ring seat are located on the same axis.

[0008] Optionally, dynamic pressure grooves evenly distributed along the circumferential direction are provided on the end face of the dynamic ring opposite to the static ring, and the dynamic pressure grooves include multiple layers of fish-scale-shaped bionic grooves, the number of layers of fish-scale-shaped bionic grooves is 2 to 6, each layer of grooves includes fish-scale-shaped bosses and flow channels between the bosses, and the number of fish-scale-shaped bosses in each layer of grooves is 12 to 36.

[0009] Optionally, the fish-scale boss includes a frontal surface and a rear surface; wherein, the frontal surface is far from the axial side, and the rear surface is close to the axial side. The radial thickness of the fish-scale boss is (a+b), the radial thickness a of the frontal surface is 0.5 to 10 mm, the radial thickness b of the rear surface is 0.5 to 10 mm, and the radius R of the circle where the trajectory of the frontal surface is located is 2 to 20 mm.

[0010] Optionally, the first layer of fish-scale bosses is farthest from the axis side, and the number of fish-scale bosses approaching the axis gradually increases, and the a, b, and R values ​​of the fish-scale bosses gradually decrease as the number of layers increases; among them, the a, b, and R dimensions of the first layer of fish-scale bosses are the largest, and the a, b, and R dimensions of the last layer of fish-scale bosses are the smallest.

[0011] Optionally, the fish-scale-shaped boss height is 2 to 50 μm.

[0012] Optionally, the method further includes: a sealing dam is provided on the end surface of the moving ring close to the inner side, and the width r of the sealing dam is 2 to 20 mm.

[0013] Optionally, spring mounting holes are provided on the stationary ring seat, a spring is provided at the exact center of each spring mounting hole, and the total number of springs is 8 to 20.

[0014] The beneficial effects of the embodiments of the present disclosure include:

[0015] (1) The dry gas sealing device of the fish scale-shaped bionic groove of the present invention is different from the existing dry gas sealing end face. It adopts a fish scale-shaped bionic groove. When the dynamic ring rotates with the rotating shaft, the sealing medium enters the dynamic pressure groove through the pumping action of the dynamic pressure groove inlet, and is squeezed by the root of the dynamic pressure groove to form a high-pressure area, thereby forming a sealing air film. The existence of the fish scale-shaped boss, on the one hand, hinders the flow of the sealing medium, increases the pressure distribution in the local area, thereby enhancing the air film stiffness of the sealing end face, and on the other hand, increases the contact area between the sealing medium and the animation, thereby enhancing the flow and heat exchange capacity of the seal and the sealing medium, playing a dual role.

[0016] (2) The dry gas sealing device of the present invention has a fish-scale-shaped bionic groove, and the dynamic ring has the ability to rotate in both directions. During actual operation, it can effectively prevent damage to the equipment caused by dry gas seal reversal due to unexpected working conditions.

[0017] (3) The dry gas sealing device of the fish-scale bionic groove of the present invention has a simple structure, is easy to disassemble, has a long service life and is convenient for subsequent maintenance.

[0018] (4) In the dry gas sealing device with a fish-scale bionic groove of the present invention, as the operating conditions such as the rotation speed change, the sealing end face clearance can be adjusted by the spring behind the static ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural schematic diagram of a dry gas sealing device of a fish-scale bionic groove according to an embodiment of the present disclosure;

[0020] Figure 2 This is a structural cross-sectional view of a dry gas sealing device of a fish-scale-shaped bionic groove according to an embodiment of the present disclosure;

[0021] Figure 3 It is a structural schematic diagram of a dynamic ring according to an embodiment of the present disclosure;

[0022] Figure 4 It is a front view of a moving ring according to an embodiment of the present disclosure;

[0023] Figure 5 It is a schematic diagram of the partial structure of a dynamic ring according to an embodiment of the present disclosure;

[0024] Figure 6 It is a structural diagram of a fish scale boss according to an embodiment of the present disclosure, wherein the structural dimensions of the fish scale boss are schematically shown;

[0025] Figure 7 Schematic diagram of the structure of a moving ring according to another embodiment of the present disclosure;

[0026] Figure 8 It is a front view of a moving ring according to another embodiment of the present disclosure.

[0027] In the figure, 1. dynamic ring; 2. static ring; 3. shaft sleeve; 4. rotating shaft; 5. static ring O-ring; 6. annular support seat; 7. static ring seat; 8. spring; 9. dynamic pressure groove; 10. fish scale boss; 11. flow channel; 12. sealing dam. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, the present disclosure is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0029] The following is a further detailed description of the implementation methods of the present application in conjunction with the accompanying drawings and examples. The detailed descriptions and drawings of the following examples are used to illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments. In the description of the present application, it should be noted that, unless otherwise specified, the meaning of "multiple" is more than two; the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inside", "outside", etc. is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not vertical in the strict sense, but within the error tolerance range. "Parallel" is not parallel in the strict sense, but within the error tolerance range.

[0030] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0031] like Figure 1-8 As shown, a dry gas sealing device with a fish-scale-shaped bionic groove includes a dynamic ring 1, a static ring 2, a shaft sleeve 3, a rotating shaft 4, a static ring O-ring 5, an annular support seat 6, a static ring seat 7 and a spring 8.

[0032] The sleeve 3 is sleeved on both sides of the rotating shaft 4, the dynamic ring 1 and the static ring 2 are installed on the sleeve 3 in a relatively matched manner, the static ring seat 7 is installed behind the static ring 2 through the spring 8 and the annular support seat 6, and the annular support seat 6 and the back of the static ring 2 are tightly fitted due to the action of the spring 8, the static ring O-ring 5 is squeezed by the annular support seat 6 and the static ring seat 7, and the centers of the dynamic ring 1, sleeve 3, static ring 2, annular support seat 6, static ring O-ring 5 and static ring seat 7 are located on the same axis.

[0033] A dynamic ring sealing end face is provided on the dynamic ring, and a plurality of dynamic pressure grooves are uniformly engraved on the dynamic ring sealing end face along the circumferential direction. The dynamic pressure groove of the present invention adopts a fish scale-shaped bionic groove, and the sealing medium flows into the dynamic pressure groove through the flow channel between the fish scale-shaped bosses. Due to the obstruction of the root of the dynamic pressure groove, a high-pressure area of ​​the dynamic pressure groove is formed, thereby squeezing the static ring to form a sealing film to achieve the sealing effect. The sealing medium is obstructed by the fish scale-shaped bionic groove boss, so that the air film opening force of the present invention is increased to enhance the pneumatic capacity of the existing dry gas sealing equipment, and at the same time solve the problems of weak heat dissipation capacity in the prior art, reduce the leakage of the working medium, weaken the wear degree of the seal, and extend the service life of the sealing equipment.

[0034] In some embodiments, the end face of the dynamic ring 1 opposite to the static ring 2 is provided with dynamic pressure grooves 9 evenly distributed along the circumferential direction, and the dynamic pressure grooves 9 include multiple layers of fish scale-shaped bionic grooves, and the number of fish scale-shaped bionic grooves is 2 to 6 layers, and each layer of grooves includes fish scale-shaped bosses 10 and flow channels 11 between the bosses, and the number of fish scale-shaped bosses 10 in each layer of grooves is 12 to 36. When there are too few bosses, there are fewer dynamic pressure grooves on the end face of the dynamic ring, and the air film stiffness is not enough to support the opening of the static ring; when there are too many bosses, the structural strength of the end face of the dynamic ring is easily affected. The appropriate number of bosses helps to enhance the aerodynamic capacity without affecting the structural strength too much.

[0035] In some embodiments, the fish scale-shaped boss 10 includes a flow-up surface and a back-flow surface, wherein the flow-up surface is far from the axial side, and the back-flow surface is close to the axial side. The radial thickness of the fish scale-shaped boss 10 is (a+b), the radial thickness a of the flow-up surface is 0.5-10 mm, the radial thickness b of the back-flow surface is 0.5-10 mm, and the radius R of the circle where the flow-up surface trajectory is located is 2-20 mm. The boss plays a role in hindering the sealing medium, thereby increasing the pressure distribution of the medium at the boss, thereby achieving the effect of enhancing the stiffness of the air film, while increasing the contact area with the sealing medium, and enhancing the flow heat exchange capacity of the seal and the sealing medium.

[0036] In some embodiments, the first layer of fish-scale bosses 10 is farthest from the axis side, and the number of layers of fish-scale bosses 10 approaching the axis gradually increases, and the a, b, and R values ​​of the fish-scale bosses 10 gradually decrease as the number of layers increases, among which the a, b, and R dimensions of the first layer of fish-scale bosses 10 are the largest, and the a, b, and R dimensions of the last layer of fish-scale bosses 10 are the smallest.

[0037] In some embodiments, the fish-scale-shaped projection 10 has a height of 2 to 50 μm.

[0038] In some embodiments, the invention further comprises: a sealing dam 12 is provided on the end surface of the moving ring 1 close to the inner side, and the width r of the sealing dam is 2 to 20 mm.

[0039] In some embodiments, spring mounting holes are provided on the stationary ring seat, and a spring 8 is provided at the center of each spring mounting hole, and the total number of springs is 8 to 20.

[0040] The present invention aims at the technical problems that during the operation of dry gas seals under high temperature and high pressure conditions, the dry gas seals have insufficient air film stiffness, which causes the rotating shaft to vibrate, resulting in dynamic and static ring contact and wear, and the need to enhance the cooling efficiency of the seals under high temperature conditions, as well as further enhance the sealing performance of existing dry gas seals. The purpose of the present invention is to provide a dry gas sealing device with a fish scale-shaped bionic groove, which enhances the pneumatic capacity of the dry gas seal based on the fish scale-shaped groove, avoids damage to the equipment caused by vibration during operation, and at the same time, the fish scale-shaped groove increases the contact area between the fluid and the dynamic ring, enhances the heat exchange between the sealing medium and the seal, and further reduces the leakage rate while retaining the advantage of bidirectional rotation.

[0041] Specific examples provided by the present disclosure include:

[0042] Example 1

[0043] As attached Figure 1 to Figure 6 As shown, the dry gas sealing structure of a fish scale-shaped bionic groove provided in this embodiment comprises a dynamic ring 1, a static ring 2, a sleeve 3, a rotating shaft 4, a static ring O-ring 5, an annular support seat 6, a static ring seat 7 and a spring 8. The sleeve 3 is sleeved on both sides of the rotating shaft 4, the dynamic ring 1 and the static ring 2 are relatively matched and installed on the sleeve 3, the static ring seat 7 is installed behind the static ring 2 through the spring 8 and the annular support seat 6, and the annular support seat 6 and the back of the static ring 2 are tightly fitted due to the action of the spring 8, the static ring O-ring 5 is squeezed by the annular support seat 6 and the static ring seat 7, and the centers of the dynamic ring 1, the sleeve 3, the static ring 2, the annular support seat 6, the static ring O-ring 5 and the static ring seat 7 are on the same axis.

[0044] In this embodiment 1, dynamic pressure grooves 9 evenly distributed along the circumferential direction are arranged on the end face of the dynamic ring 1 opposite to the static ring 2, and the dynamic pressure grooves 9 include multiple layers of fish-scale bionic grooves. Preferably, the number of layers of fish-scale bionic grooves is 3, and each layer of grooves includes fish-scale bosses 10 and flow channels 11 between the bosses. Preferably, the number of fish-scale bosses 10 in each layer of grooves is 24.

[0045] In this embodiment 1, the fish scale boss 10 is divided into a flow-up surface and a back-flow surface, the flow-up surface is far from the axial side, and the back-flow surface is close to the axial side. The radial thickness of the fish scale boss 10 is (a+b), the radial thickness a of the flow-up surface is 0.5-10mm, the radial thickness b of the back-flow surface is 0.5-10mm, and the radius R of the circle where the flow-up surface track is located is 2-20mm. The first layer of fish scale bosses 10 is the farthest from the axial side, and the number of fish scale bosses 10 approaching the axis gradually increases. The a, b, and R values ​​of the fish scale bosses 10 gradually decrease as the number of layers increases. The a, b, and R dimensions of the first layer of fish scale bosses 10 are the largest, and the a, b, and R dimensions of the last layer of fish scale bosses 10 are the smallest.

[0046] In this embodiment 1, the height of the fish-scale boss 10 is 2 to 50 μm. Since the radial dimension is in the millimeter level, the groove depth dimension is too small in the micrometer level. For the convenience of observation, the axial dimension is magnified 1000 times in this embodiment 1. Figure 1 to Figure 6 The dimension shown in the figure is 10 mm boss height. And the height of each level of fish scale boss in this embodiment 1 is the same.

[0047] In the present embodiment 1, the end surface of the moving ring 1 close to the inner side is a sealing dam 12, and the width r of the sealing dam is 2-20 mm.

[0048] In the present embodiment 1, spring mounting holes are arranged on the stationary ring seat, a spring 8 is arranged at the center of each spring mounting hole, and the total number of springs is 8 to 20.

[0049] Example 2

[0050] As attached Figure 7-Figure 8 As shown, this embodiment provides a dry gas sealing device with a fish-scale shaped bionic groove. Compared with Embodiment 1, this embodiment 2 adopts 4 layers of fish-scale shaped bionic grooves, and the number of fish-scale shaped bosses in each layer is 16. The increase in the number of layers enhances the aerodynamic capacity of the air film end face, but at the same time increases the difficulty of processing the end face.

[0051] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A dry gas sealing device for a fish scale-shaped bionic groove, characterized in that: It includes a dynamic ring, a static ring, a sleeve, a rotating shaft, a static ring O-ring, an annular support seat, a static ring seat and a spring; The shaft sleeve is sleeved on both sides of the rotating shaft, the dynamic ring and the static ring are installed on the shaft sleeve in a relatively matched manner, the static ring seat is installed behind the static ring through a spring and an annular support seat, and the annular support seat and the back of the static ring are tightly fitted due to the action of the spring, the static ring O-ring is squeezed by the annular support seat and the static ring seat, and the centers of the dynamic ring, shaft sleeve, static ring, annular support seat, static ring O-ring and static ring seat are located on the same axis.

2. The dry gas sealing device of the fish scale bionic groove according to claim 1, characterized in that: Dynamic pressure grooves evenly distributed along the circumferential direction are arranged on the end face of the dynamic ring opposite to the static ring. The dynamic pressure grooves include multiple layers of fish-scale bionic grooves. The number of layers of fish-scale bionic grooves is 2 to 6. Each layer of grooves includes fish-scale bosses and flow channels between the bosses. The number of fish-scale bosses in each layer of grooves is 12 to 36.

3. The dry gas sealing device of the fish scale bionic groove according to claim 2, characterized in that: The fish-scale-shaped boss includes a frontal surface and a rear surface; the frontal surface is far from the axis side, and the rear surface is close to the axis side. The radial thickness of the fish-scale-shaped boss is (a+b), the radial thickness a of the frontal surface is 0.5 to 10 mm, the radial thickness b of the rear surface is 0.5 to 10 mm, and the radius R of the circle where the trajectory of the frontal surface is located is 2 to 20 mm.

4. The dry gas sealing device of the fish scale bionic groove according to claim 3, characterized in that: The first layer of fish-scale bosses is the farthest from the axis side, and the number of fish-scale bosses approaching the axis gradually increases. The a, b, and R values ​​of the fish-scale bosses gradually decrease as the number of layers increases; among them, the a, b, and R dimensions of the first layer of fish-scale bosses are the largest, and the a, b, and R dimensions of the last layer of fish-scale bosses are the smallest.

5. The dry gas sealing device of the fish scale bionic groove according to claim 2, characterized in that: The fish scale-shaped boss height is 2 to 50 μm.

6. The dry gas sealing device of the fish scale bionic groove according to claim 1, characterized in that: Also includes: A sealing dam is provided on the end surface of the moving ring near the inner side, and the width r of the sealing dam is 2 to 20 mm.

7. The dry gas sealing device of the fish scale bionic groove according to claim 1, characterized in that: Spring mounting holes are arranged on the stationary ring seat, a spring is arranged in the center of each spring mounting hole, and the total number of the springs is 8 to 20.

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