Dry gas seal with elastic compensation structure

Abstract

The utility model relates to the technical field of dry gas seals, and discloses a dry gas seal with an elastic compensation structure, which comprises an inner shaft, an outer shell I and an outer shell II, the outer shell I and the outer shell II are respectively and movably sleeved on the outer wall of the inner shaft, the outer shell I and the outer shell II are fixedly connected through a bolt, the inner side of the inner shaft is provided with a clamping groove, and the clamping groove is fixedly connected with the inner shaft. A first movable groove is formed in the left side of the first shell. The first static ring moves rightwards due to abrasion or displacement, the push ring moves along with the first static ring, the push ring moves to compress the first spring and drive the movable outer cylinder to slide in the fixed outer cylinder, the second spring is compressed in the process, the elastic force of the first spring and the second spring pushes the push ring and the movable outer cylinder to move reversely, and the movable outer cylinder is driven to slide in the fixed outer cylinder. And then the first static ring is pushed to return to a proper sealing position, so that the effects of realizing elastic compensation and maintaining good contact and sealing performance of a sealing surface are achieved.

Description

Technical Field

[0001] This utility model relates to the field of dry gas sealing technology, specifically a dry gas seal with an elastic compensation structure. Background Technology

[0002] In industrial production, dry gas seals are key components ensuring the safe and efficient operation of rotating equipment, and their performance directly affects the stability and continuity of production. However, traditional dry gas seals have revealed many problems in actual use.

[0003] With prolonged equipment operation, the sealing surface of the dry gas seal is prone to wear due to friction. Furthermore, the inner shaft inevitably undergoes slight displacement during operation. Under these circumstances, traditional dry gas seals, lacking an effective elastic compensation mechanism, cannot adjust the position of the sealing surface in a timely manner. This leads to a decrease in the fit between the dynamic and static rings, making it difficult to maintain a stable gas film thickness. Consequently, sealing performance is significantly reduced, and the risk of leakage increases substantially. This not only results in energy waste but may also cause safety accidents due to media leakage, seriously threatening normal production operations. Utility Model Content

[0004] The purpose of this invention is to provide a dry gas seal with an elastic compensation structure, which solves the technical problem that traditional dry gas seals cannot adjust the position of the sealing surface in a timely manner due to the lack of an effective elastic compensation mechanism, and achieves the purpose of maintaining good contact and sealing performance of the sealing surface through elastic compensation.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a dry gas seal with an elastic compensation structure, comprising an inner shaft, a first outer shell, and a second outer shell. The first and second outer shells are respectively movably fitted onto the outer wall of the inner shaft. The first and second outer shells are fixedly connected by bolts. A locking groove is provided on the inner side of the inner shaft. A movable groove is provided on the left side of the first outer shell, and an installation groove is provided inside the movable groove. A movable groove is provided on the left side of the second outer shell, and an installation groove is provided inside the movable groove. A second air inlet and a second air outlet are respectively circumferentially equidistantly provided on the outer wall of the first outer shell, with the second air outlet located to the right of the second air inlet. A first air inlet and a first air outlet are respectively circumferentially equidistantly provided on the outer wall of the second outer shell, with the first air inlet located to the right of the first air outlet. A sealing assembly is provided between the first and second outer shells and the inner shaft.

[0006] Preferably, the sealing assembly includes: a sealing component disposed on the outer wall of the inner shaft; and an elastic compensation component disposed between the sealing components.

[0007] Preferably, the sealing component includes: a first moving ring, fixedly installed inside the engagement groove of the inner shaft; a first stationary ring, movably sleeved on the outer wall of the inner shaft; a first limiting ring, fixedly installed on the inner wall of the first outer shell; a second moving ring, fixedly sleeved on the outer wall of the inner shaft; a second stationary ring, movably sleeved on the outer wall of the inner shaft; and a second limiting ring, fixedly sleeved on the inner wall of the second outer shell.

[0008] Preferably, the first moving ring has a first spiral groove on each side, the first stationary ring is movably disposed on the right side of the first spiral groove, the first stationary ring is movably connected to the outer shell, the first limiting ring is movably connected to the outer shell through a movable groove, the first limiting ring is disposed between the outer shell and the second moving ring, the second moving ring has a second spiral groove on each side, the second stationary ring is disposed on the right side of the second moving ring, the second limiting ring is disposed on the right side of the second stationary ring, and the outer circumference of the second limiting ring has three air inlets at equal intervals, the three air inlets being connected to the first air inlet.

[0009] The first spiral grooves on both sides of the first moving ring and the second spiral grooves on both sides of the second moving ring pump the introduced dry gas as the moving ring rotates with the inner shaft.

[0010] Preferably, the elastic compensation component includes: a fixed outer cylinder, which is circumferentially and equidistantly installed inside mounting groove one and mounting groove two.

[0011] Preferably, a movable outer cylinder is slidably connected inside the fixed outer cylinder, and a push ring is fixedly installed at the other end of the movable outer cylinder. The left side of the push ring is in contact with the right side of the first stationary ring. A spring is sleeved on the outer wall of the fixed outer cylinder and the movable outer cylinder. One end of the spring is fixedly connected to the push ring, and the other end of the spring is fixedly connected to the outer shell. A fixed inner cylinder is fixedly installed inside the fixed outer cylinder, and a limiting circular plate is slidably connected inside the fixed inner cylinder. A connecting rod is fixedly installed on the left side of the limiting circular plate.

[0012] A fixed inner cylinder is fixedly installed inside the fixed outer cylinder. The fixed inner cylinder and the movable outer cylinder cooperate with each other to form a multi-layer nested structure.

[0013] Preferably, the other end of the connecting rod movably penetrates one side of the inner wall of the fixed inner cylinder and extends to one side of the outer wall of the fixed inner cylinder, and contacts the inner wall of the movable outer cylinder. A second spring is sleeved on the outer wall of the fixed inner cylinder and the connecting rod. One end of the second spring is fixedly connected to the fixed outer cylinder, and the other end of the second spring is fixedly connected to the movable outer cylinder. The second spring is disposed inside the movable outer cylinder and the fixed outer cylinder. A sealing rubber ring is provided between the push ring and the first stationary ring.

[0014] The connecting rod moves through the fixed inner cylinder and contacts the inner wall of the movable outer cylinder, further guiding and limiting the sliding of the movable outer cylinder.

[0015] This invention provides a dry gas seal with an elastic compensation structure. It has the following beneficial effects:

[0016] (1) In this utility model, the first stationary ring moves to the right due to wear or displacement, and the push ring moves with the first stationary ring. The movement of the push ring will compress the first spring and drive the movable outer cylinder to slide inside the fixed outer cylinder. During this process, the second spring will also be compressed. The elastic force of the first spring and the second spring will push the push ring and the movable outer cylinder to move in opposite directions, thereby pushing the first stationary ring to return to the appropriate sealing position, so as to achieve elastic compensation and maintain good contact and sealing performance of the sealing surface.

[0017] (2) The present invention uses a sealing rubber ring between the push ring and the first stationary ring to play an auxiliary sealing role, preventing gas from leaking from the connection between the push ring and the first stationary ring, thereby further improving the sealing performance of the entire sealing structure. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a cross-sectional view of the overall structure of this utility model;

[0020] Figure 3 This is an exploded view of the internal structure of this utility model;

[0021] Figure 4 This utility model Figure 2 A magnified view of A in the middle.

[0022] In the diagram: 1 Inner shaft, 2 Outer shell one, 3 Outer shell two, 4 Sealing assembly, 5 First air inlet, 6 First air outlet, 7 Second air inlet, 8 Second air outlet;

[0023] 41 Sealing component, 411 First rotating ring, 412 First spiral groove, 413 First stationary ring, 414 First limiting ring, 415 Second rotating ring, 416 Second spiral groove, 417 Second stationary ring, 418 Second limiting ring;

[0024] 42 Elastic compensation component, 421 Fixed outer cylinder, 422 Movable outer cylinder, 423 Push ring, 424 Spring 1, 425 Fixed inner cylinder, 426 Limiting circular plate, 427 Connecting rod, 428 Spring 2, 429 Sealing rubber ring. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. Example

[0027] Based on the problem that traditional dry gas seals lack an effective elastic compensation mechanism and cannot adjust the position of the sealing surface in a timely manner, this utility model provides a preferred embodiment of a dry gas seal with an elastic compensation structure, for example... Figure 1-4As shown: A dry gas seal with an elastic compensation structure includes an inner shaft 1, a first outer shell 2, and a second outer shell 3. The first outer shell 2 and the second outer shell 3 are movably fitted onto the outer wall of the inner shaft 1, and are fixedly connected by bolts. An engagement groove is provided on the inner side of the inner shaft 1. A first movable groove is provided on the left side of the first outer shell 2, and an installation groove is provided inside the first movable groove. A second movable groove is provided on the left side of the second outer shell 3, and an installation groove is provided inside the second movable groove. Second grooves are provided equidistantly on the outer wall of the first outer shell 2. An air inlet 7 and a second air outlet 8 are provided, with the second air outlet 8 located to the right of the second air inlet 7. A first air inlet 5 and a first air outlet 6 are circumferentially equidistantly spaced on the outer wall of the second outer casing 3, with the first air inlet 5 located to the right of the first air outlet 6. A sealing assembly 4 is provided between the first outer casing 2, the second outer casing 3, and the inner shaft 1. The sealing assembly 4 includes: a sealing component 41, disposed on the outer wall of the inner shaft 1; and an elastic compensation component 42, disposed between the sealing components 41. The sealing component 41 includes: a first moving ring 411, which is fixedly installed... The first stationary ring 413 is movably fitted onto the outer wall of the inner shaft 1; the first limiting ring 414 is fixedly installed on the inner wall of the outer shell 2; the second moving ring 415 is fixedly fitted onto the outer wall of the inner shaft 1; the second stationary ring 417 is movably fitted onto the outer wall of the inner shaft 1; the second limiting ring 418 is fixedly fitted onto the inner wall of the outer shell 3; the first moving ring 411 has a first spiral groove 412 on each side, and the first stationary ring 413 is movably positioned on the right side of the first spiral groove 412. The stationary ring 413 is movably connected to the outer shell 2. The first limiting ring 414 is movably connected to the outer shell 2 through the movable groove 1. The first limiting ring 414 is located between the outer shell 2 and the second moving ring 415. The second moving ring 415 has a second spiral groove 416 on each side. The second stationary ring 417 is located on the right side of the second moving ring 415. The second limiting ring 418 is located on the right side of the second stationary ring 417. The outer circumference of the second limiting ring 418 has three air inlets at equal intervals. The three air inlets are connected to the first air inlet 5.

[0028] Furthermore, in this embodiment, by opening a first air inlet 5, external dry and clean gas first enters through the first air inlet 5. Since the outer wall of the second limiting ring 418 is provided with three air inlets at equal intervals, and the three air inlets are connected to the first air inlet 5, the gas will enter the sealing area between the second moving ring 415 and the second stationary ring 417 through the three air inlets. At the same time, another part of the gas enters through the second air inlet 7 and acts on the sealing area between the first moving ring 411 and the first stationary ring 413. When the inner shaft 1 rotates, it drives the first moving ring 411 and the second moving ring 415 to rotate synchronously. During the rotation, the first spiral groove 412 on both sides of the first moving ring 411 and the second spiral groove 416 on both sides of the second moving ring 415 will produce a pumping effect on the gas entering the sealing area. Under the action of the spiral grooves, the gas is gradually compressed and flows towards the outer diameter of the sealing surface, forming a gas film with a certain pressure between the first moving ring 411 and the first stationary ring 413, and between the second moving ring 415 and the second stationary ring 417. Example

[0029] Based on Embodiment 1, a preferred embodiment of the dry gas seal with an elastic compensation structure provided by this utility model is, for example... Figure 1-4 As shown: The elastic compensation component 42 includes: a fixed outer cylinder 421, circumferentially and equidistantly installed inside mounting groove one and mounting groove two; a movable outer cylinder 422 is slidably connected inside the fixed outer cylinder 421, and a push ring 423 is fixedly installed at the other end of the movable outer cylinder 422, with the left side of the push ring 423 contacting the right side of the first stationary ring 413; a spring 424 is sleeved on the outer wall of the fixed outer cylinder 421 and the movable outer cylinder 422, with one end of the spring 424 fixedly connected to the push ring 423 and the other end of the spring 424 fixedly connected to the outer shell 2; a fixed inner cylinder 425 is fixedly installed inside the fixed outer cylinder 421, and a sliding connection is made inside the fixed inner cylinder 425. A limiting circular plate 426 is provided, and a connecting rod 427 is fixedly installed on the left side of the limiting circular plate 426. The other end of the connecting rod 427 movably passes through one side of the inner wall of the fixed inner cylinder 425 and extends to one side of the outer wall of the fixed inner cylinder 425, and contacts the inner wall of the movable outer cylinder 422. A second spring 428 is sleeved on the outer wall of the fixed inner cylinder 425 and the connecting rod 427. One end of the second spring 428 is fixedly connected to the fixed outer cylinder 421, and the other end of the second spring 428 is fixedly connected to the movable outer cylinder 422. The second spring 428 is located inside the movable outer cylinder 422 and the fixed outer cylinder 421. A sealing rubber ring 429 is provided between the push ring 423 and the first stationary ring 413.

[0030] Furthermore, in this embodiment, as the first stationary ring 413 moves to the right due to wear or displacement, the push ring 423 moves along with the first stationary ring 413. The movement of the push ring 423 compresses the first spring 424, and at the same time drives the movable outer cylinder 422 to slide within the fixed outer cylinder 421. During this process, the second spring 428 is also compressed. The elastic force of the first spring 424 and the second spring 428 will push the push ring 423 and the movable outer cylinder 422 to move in opposite directions, thereby pushing the first stationary ring 413 back to the appropriate sealing position, realizing elastic compensation, maintaining good contact and sealing performance of the sealing surface. The setting of the limiting circular plate 426 and the connecting rod 427 plays the role of limiting the movement range of the movable outer cylinder 422, ensuring the stability and accuracy of the elastic compensation process.

[0031] In use, dry and clean external gas first enters through the first air inlet 5. Since the outer wall of the second limiting ring 418 has three equidistant air inlets, and these three inlets are connected to the first air inlet 5, the gas enters the sealing area between the second moving ring 415 and the second stationary ring 417 through the air inlets. Simultaneously, another portion of the gas enters through the second air inlet 7 and acts on the sealing area between the first moving ring 411 and the first stationary ring 413. When the inner shaft 1 rotates, it drives the first moving ring 411 and the second moving ring 415 to rotate synchronously. The first spiral grooves 4 on both sides of the first moving ring 411... During rotation, the second spiral grooves 416 on both sides of the second rotating ring 415 and the second rotating ring 415 will pump the gas entering the sealing area. Under the action of the spiral grooves, the gas is gradually compressed and flows towards the outer diameter of the sealing surface, forming a gas film with a certain pressure between the first rotating ring 411 and the first stationary ring 413, and between the second rotating ring 415 and the second stationary ring 417. This gas film separates the rotating ring and the stationary ring, achieving non-contact sealing, greatly reducing friction and wear, and preventing leakage of the sealed medium. When the sealing surface wears or the inner shaft 1 has a slight displacement, the elastic compensation component 42 starts to activate. When the first stationary ring 413 moves to the right due to wear or displacement, the push ring 423 moves with it. This movement compresses the first spring 424 and simultaneously causes the movable outer cylinder 422 to slide within the fixed outer cylinder 421. During this process, the second spring 428 is also compressed. The elastic forces of the first spring 424 and the second spring 428 push the push ring 423 and the movable outer cylinder 422 in the opposite direction, thereby pushing the first stationary ring 413 back to the appropriate sealing position. This achieves elastic compensation, maintains good contact and sealing performance of the sealing surface, and the design of the limiting circular plate 426 and the connecting rod 427... The outer cylinder 422 is positioned to limit its range of movement, ensuring the stability and accuracy of the elastic compensation process. After passing through the sealing area, the gas is discharged from the first outlet 6 and the second outlet 8. During the sealing process, the first outlet 6 and the second outlet 8 remain unobstructed, ensuring normal gas circulation within the sealing cavity, maintaining stable gas film pressure and good sealing effect. The sealing rubber ring 429 between the push ring 423 and the first stationary ring 413 plays an auxiliary sealing role, preventing gas leakage from the connection between the push ring 423 and the first stationary ring 413, further improving the sealing performance of the entire sealing structure.

[0032] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A dry gas seal with an elastic compensation structure, comprising an inner shaft (1), a first outer shell (2), and a second outer shell (3), characterized in that: The outer shell 1 (2) and the outer shell 2 (3) are respectively movably sleeved on the outer wall of the inner shaft (1). The outer shell 1 (2) and the outer shell 2 (3) are fixedly connected by bolts. The inner side of the inner shaft (1) is provided with a locking groove. The left side of the outer shell 1 (2) is provided with a movable groove 1. The inside of the movable groove 1 is provided with an installation groove 1. The left side of the outer shell 2 (3) is provided with a movable groove 2. The inside of the movable groove 2 is provided with an installation groove 2. The outer wall of the outer shell 1 (2) is provided with a second air inlet (7) and a second air outlet (8) at equal intervals around the circumference. The second air outlet (8) is located to the right of the second air inlet (7). The outer wall of the outer shell 2 (3) is provided with a first air inlet (5) and a first air outlet (6) at equal intervals around the circumference. The first air inlet (5) is located to the right of the first air outlet (6). A sealing assembly (4) is provided between the outer shell 1 (2), the outer shell 2 (3) and the inner shaft (1).

2. A dry gas seal with an elastic compensation structure according to claim 1, characterized in that: The sealing assembly (4) includes: A sealing component (41) is disposed on the outer wall of the inner shaft (1); An elastic compensation component (42) is disposed between the sealing components (41).

3. A dry gas seal with an elastic compensation structure according to claim 2, characterized in that: The sealing component (41) includes: The first moving ring (411) is fixedly installed inside the engagement groove opened in the inner shaft (1); The first stationary ring (413) is movably sleeved on the outer wall of the inner shaft (1); The first limiting ring (414) is fixedly installed on the inner wall of the outer shell (2); The second moving ring (415) is fixedly sleeved on the outer wall of the inner shaft (1); The second stationary ring (417) is movably sleeved on the outer wall of the inner shaft (1); The second limiting ring (418) is fixedly sleeved on the inner wall of the outer shell (3).

4. A dry gas seal with an elastic compensation structure according to claim 3, characterized in that: The first moving ring (411) has a first spiral groove (412) on each side. The first stationary ring (413) is movably disposed on the right side of the first spiral groove (412). The first stationary ring (413) is movably connected to the outer shell (2). The first limiting ring (414) is movably connected to the outer shell (2) through the first movable groove. The first limiting ring (414) is disposed between the outer shell (2) and the second moving ring (415). The second moving ring (415) has a second spiral groove (416) on each side. The second stationary ring (417) is disposed on the right side of the second moving ring (415). The second limiting ring (418) is disposed on the right side of the second stationary ring (417). The outer wall of the second limiting ring (418) has three air inlets equidistantly distributed around its circumference. The three air inlets are connected to the first air inlet (5).

5. A dry gas seal with an elastic compensation structure according to claim 2, characterized in that: The elastic compensation component (42) includes: The outer cylinder (421) is fixed and installed circumferentially at equal intervals inside the mounting slot one and mounting slot two.

6. A dry gas seal with an elastic compensation structure according to claim 5, characterized in that: The fixed outer cylinder (421) is slidably connected to the inside of the movable outer cylinder (422). The other end of the movable outer cylinder (422) is fixedly installed with a push ring (423). The left side of the push ring (423) is in contact with the right side of the first stationary ring (413). The outer walls of the fixed outer cylinder (421) and the movable outer cylinder (422) are fitted with a spring (424). One end of the spring (424) is fixedly connected to the push ring (423), and the other end of the spring (424) is fixedly connected to the outer shell (2). The fixed outer cylinder (421) is fixedly installed with a fixed inner cylinder (425). The fixed inner cylinder (425) is slidably connected with a limiting circular plate (426). The left side of the limiting circular plate (426) is fixedly installed with a connecting rod (427).

7. A dry gas seal with an elastic compensation structure according to claim 6, characterized in that: The other end of the connecting rod (427) movably passes through one side of the inner wall of the fixed inner cylinder (425) and extends to one side of the outer wall of the fixed inner cylinder (425), and contacts the inner wall of the movable outer cylinder (422). The outer wall of the fixed inner cylinder (425) and the connecting rod (427) is fitted with a second spring (428). One end of the second spring (428) is fixedly connected to the fixed outer cylinder (421), and the other end of the second spring (428) is fixedly connected to the movable outer cylinder (422). The second spring (428) is located inside the movable outer cylinder (422) and the fixed outer cylinder (421). A sealing rubber ring (429) is provided between the push ring (423) and the first stationary ring (413).

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