Dry gas sealing structure with cobweb-like grooves

Abstract

The utility model discloses a dry gas seal structure with cobweb imitating grooves, which relates to the technical field of fluid dynamic seal, and comprises a moving ring and a static ring, the end face of the moving ring or the static ring is provided with a dynamic pressure groove, the dynamic pressure groove comprises a plurality of linear drainage grooves extending in the radial direction and a plurality of arc-shaped grooves connecting two adjacent linear drainage grooves, and the arc-shaped grooves are communicated with the moving ring or the static ring. The linear drainage groove is opened at the outer diameter end of the movable ring or the static ring, and the inner diameter end is closed; the problems that due to an existing dry gas sealing groove type structure, stress of a sealing working face is concentrated, and the dynamic pressure effect is poor are solved.

Description

Technical Field

[0001] This utility model relates to the field of fluid dynamic sealing technology, specifically to a dry gas sealing structure with a spider web-like groove. Background Technology

[0002] In the field of fluid sealing, as mechanical equipment is increasingly used in high-parameter operating conditions, more stringent requirements are being placed on the shaft end seals of rotating machinery. As a non-contact mechanical seal, dry gas seals exhibit significant advantages over traditional labyrinth seals and brush seals, featuring low leakage, low wear, and long service life. Therefore, they have become the best choice for shaft end seals in high-pressure, high-speed applications.

[0003] Dry gas seals are classified into two types: unidirectional rotary and bidirectional rotary. Unidirectional rotary dry gas seals typically have an asymmetrical groove design, exhibiting a significant dynamic pressure effect, but are only suitable for unidirectional rotary operation and have a relatively high leakage rate. To adapt to bidirectional rotary operation, bidirectional rotary dry gas seals are designed with a symmetrical groove structure, but the dynamic pressure effect is weaker; moreover, due to the uneven distribution of gas film pressure in existing dry gas seals, stress concentration occurs at the root of the seal groove, which is not conducive to long-term stable operation. Utility Model Content

[0004] This invention provides a dry gas sealing structure with a spider web-like groove to solve the problems of stress concentration on the sealing working surface and weak dynamic pressure effect caused by the existing dry gas sealing groove structure.

[0005] To achieve the above objectives, this utility model provides the following solution:

[0006] A dry gas sealing structure with a spider web-like groove includes a dynamic ring and a stationary ring. The dynamic pressure groove is provided on the end face of the dynamic ring or the stationary ring. The dynamic pressure groove includes a plurality of radially extending straight drainage grooves and a plurality of arc-shaped grooves connecting two adjacent straight drainage grooves. The straight drainage grooves are open at the outer diameter end and closed at the inner diameter end of the dynamic ring or the stationary ring.

[0007] This invention, by setting multiple straight drainage grooves and arc-shaped grooves on the end face of the rotating or stationary ring, guides and disperses the stress on the rotating or stationary ring, forming multiple high-pressure zones on the end face of the sealing structure. This significantly enhances the dynamic pressure effect of the dry gas sealing structure, improves the opening force, and facilitates sufficient cooling and lubrication of the end face. Compared with existing end face sealing structures, this dry gas sealing structure further divides the end face of the rotating or stationary ring into multiple sealing weirs through straight drainage grooves and arc-shaped grooves, providing a larger sealing area, effectively reducing leakage of the sealing medium, and improving shaft end sealing performance. The straight drainage grooves facilitate the smooth flow of air and can pump impurities in the sealing medium out of the sealing end face, making the seal more reliable.

[0008] Because of the large area of ​​the air film pressure, this invention can adjust the sealing gap by making a small axial displacement of the moving ring or stationary ring, thus achieving a better sealing effect. The effect is particularly significant in high-speed rotating machinery or low-speed reciprocating machinery.

[0009] Furthermore, the inner diameter end of the moving ring or the stationary ring is provided with a sealing dam, and the sealing dam is provided with several return grooves.

[0010] Furthermore, the reflux groove is an arc-shaped groove.

[0011] Furthermore, both ends of the reflux groove are connected to the shaft holes of the moving ring or the stationary ring.

[0012] Furthermore, the width of the middle part of the return channel is smaller than the width of the two ends.

[0013] To reduce leakage of the sealing medium, the reverse pumping action of the return channel draws the leaked medium back into the return channel, creating a local high-pressure zone in the narrow section of the return channel, which further improves the sealing effect.

[0014] Furthermore, the straight drainage channel and the arc-shaped channel have the same depth.

[0015] Furthermore, the spacing between two radially adjacent arc-shaped grooves gradually increases from the direction closer to the center of the moving ring or stationary ring towards the direction farther away from the center of the moving ring or stationary ring.

[0016] Furthermore, the center of the arc-shaped groove is located in a direction away from the center of the moving ring or the stationary ring.

[0017] Furthermore, the included angle between two adjacent straight drainage channels is 2 to 5°, and the depth of the straight drainage channel and the arc-shaped channel is 5 to 20 μm.

[0018] Furthermore, the depth of the return channel is less than the depth of the straight channel and the arc-shaped channel.

[0019] The uniform distribution of dynamic pressure grooves on the end face effectively disperses the load and stress, making the load distribution more uniform. This helps to improve the stability and durability of the sealing structure and reduce the risk of fatigue and breakage. The mirror-symmetric structure of the dynamic pressure grooves does not require the direction of shaft rotation and can rotate in one or two directions, providing a flexible range of applications.

[0020] One or more technical solutions provided by this utility model have at least the following technical effects or advantages:

[0021] (1) By setting multiple straight drainage grooves and arc grooves on the end face of the moving ring or stationary ring, the stress on the moving ring or stationary ring is guided and dispersed by the straight drainage grooves and arc grooves, and multiple high pressure zones are formed on the end face of the sealing structure, which significantly enhances the dynamic pressure effect of the dry gas sealing structure, improves the opening force, and is beneficial to fully cool and lubricate the end face.

[0022] (2) By dividing the end face of the dynamic ring or stationary ring into multiple sealing weirs through straight drainage grooves and arc grooves, a larger sealing area can be provided, which can effectively reduce the leakage of sealing medium and improve the sealing performance of the shaft end; the straight drainage groove is conducive to guiding the smooth flow of air and can pump impurities in the sealing medium out of the sealing end face, making the seal more reliable.

[0023] (3) The sealing gap can be adjusted by a small axial displacement to achieve a better sealing effect, which is particularly effective in high-speed rotating machinery or low-speed reciprocating machinery.

[0024] (4) By using the reverse pumping action of the return channel, the medium leaked at the outlet is sucked back into the return channel, forming a local high-pressure zone in the narrow section of the return channel, which further improves the sealing effect.

[0025] (5) The uniform distribution of the dynamic pressure groove on the end face effectively disperses the load and stress, making the load distribution more uniform, which helps to improve the stability and durability of the sealing structure and reduce the risk of fatigue and breakage. The mirror symmetric structure of the dynamic pressure groove has no requirement for the rotation direction of the shaft, and can rotate in one direction or in two directions, which has a flexible range of applications. Attached Figure Description

[0026] The accompanying drawings, which are provided to further illustrate the embodiments of the present invention and constitute a part of the present invention, do not constitute a limitation thereof.

[0027] Figure 1 This is a schematic diagram of the dynamic ring structure of the dry gas sealing structure in this utility model;

[0028] Figure 2This is a cross-sectional view of the moving ring structure in this utility model;

[0029] Among them, 1-dynamic ring, 2-straight flow channel, 3-circular arc channel, 4-sealed dam, 5-return channel. Detailed Implementation

[0030] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, where there is no conflict, the embodiments of this utility model and the features within them can be combined with each other.

[0031] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0032] Example 1

[0033] This embodiment provides a dry gas sealing structure with a spiderweb-like groove, such as Figure 1 As shown, it includes a moving ring 1 and a stationary ring. The end face of the moving ring 1 or the stationary ring is provided with a dynamic pressure groove. The dynamic pressure groove includes a plurality of radially extending straight drainage grooves 2 and a plurality of arc-shaped grooves 3 connecting two adjacent straight drainage grooves 2. The straight drainage grooves 2 are open at the outer diameter end of the moving ring or the stationary ring and closed at the inner diameter end.

[0034] Among them, the straight drainage grooves 2 and the arc-shaped grooves 3 are distributed in a spider web pattern on the end face of the moving ring 1 or the stationary ring. The number of straight drainage grooves 2 is preferably greater than or equal to 6, and they are evenly distributed around the axis of the moving ring 1 or the stationary ring. During installation, the dynamic pressure groove is placed between the moving ring 1 and the stationary ring. The number of arc-shaped grooves 3 is set according to the distance between two adjacent arc-shaped grooves 3 and the radius of the moving ring 1 or the stationary ring. Preferably, there are more than or equal to 2 and less than or equal to 5 on the same radius line. The inner diameter ends of two adjacent straight drainage grooves 2 are preferably connected through an arc-shaped groove 3.

[0035] In a more preferred embodiment, the straight drainage groove 2 and the arc-shaped groove 3 have equal depths. The groove depth is preferably 5–20 μm, and the surfaces of the straight drainage groove 2 and the arc-shaped groove 3 are smooth, which facilitates the smooth flow of airflow and makes it less likely for impurities in the sealing working fluid to accumulate, reducing the risk of damage to the sealing end face and promoting the safe and reliable operation of the sealing system.

[0036] In a more preferred embodiment, the spacing between two radially adjacent arcuate grooves 3 gradually increases from the direction closer to the center of the moving ring 1 or the stationary ring towards the direction farther from the center of the moving ring 1 or the stationary ring. Preferably, it is configured as a progressively increasing structure, with an increment range of 0.5–1 mm.

[0037] In a more preferred embodiment, the center of the arc-shaped groove 3 is located away from the center of the moving ring 1 or the stationary ring.

[0038] In a more preferred embodiment, the included angle between two adjacent straight drainage channels 2 is 2 to 5°, and the depth of the straight drainage channel 2 and the arc-shaped channel 3 is 5 to 20 μm.

[0039] In a more preferred embodiment, the depth of the return channel 5 is less than the depth of the straight channel 2 and the arc-shaped channel 3.

[0040] Among them, the straight drainage channels 12 are distributed radially outward from the center of the moving ring 1 or the stationary ring.

[0041] Example 2

[0042] Based on Example 1, such as Figure 1 As shown, a sealing dam 4 is provided on the inner side of either the moving ring 1 or the stationary ring, and a plurality of return grooves 5 are formed on the sealing dam 4. The number of return grooves 5 is preferably 3-6.

[0043] In a more preferred embodiment, the reflux groove 5 is an arc-shaped groove.

[0044] In a more preferred embodiment, both ends of the reflux groove 5 are connected to the shaft hole of the moving ring 1 or the stationary ring.

[0045] In a more preferred embodiment, the width of the middle part of the return channel 5 is smaller than the width of both ends.

[0046] The two side walls of the reflux trough 5 are composed of two arc surfaces, and the radius of the outer arc surface is greater than the radius of the inner arc surface. The depth of the reflux trough 31 is less than the depth of the dynamic pressure trough, preferably 3 to 5 μm.

[0047] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0048] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A dry gas seal structure having a mimic spider-web type groove, comprising a dynamic ring (1) and a static ring, characterized in that, The end face of the movable ring (1) or the stationary ring is provided with a dynamic pressure groove, which comprises a plurality of radially extending linear flow grooves (2) and a plurality of circular arc grooves (3) connecting adjacent two linear flow grooves (2), and the linear flow grooves (2) are open at the outer diameter end of the movable ring or the stationary ring and closed at the inner diameter end.

2. A dry gas seal structure having a spider-web type groove according to claim 1, wherein The inner diameter end of the movable ring (1) or the stationary ring is provided with a sealing dam (4), and a plurality of backflow grooves (5) are formed in the sealing dam (4).

3. A dry gas seal structure having a spider-web type groove according to claim 2, wherein The backflow groove (5) is an arc-shaped groove.

4. A dry gas seal structure having a spider-web type groove according to claim 2, wherein Both ends of the backflow groove (5) are in communication with the shaft hole of the movable ring (1) or the stationary ring.

5. A dry gas seal structure having a spider-web type groove according to claim 2, wherein The width of the middle part of the backflow groove (5) is smaller than that of the two ends.

6. A dry gas seal structure having a spider-web type slot as set forth in claim 1, wherein, The groove depth of the linear flow groove (2) and the circular arc groove (3) is equal.

7. The dry gas seal structure having a spider-web type slot of claim 1, wherein, The spacing between two radially adjacent circular arc grooves (3) gradually increases from the direction close to the center of the movable ring (1) or the stationary ring to the direction away from the center of the movable ring (1) or the stationary ring.

8. A dry gas seal structure having a spider-web type slot as set forth in claim 1, wherein, The center of the circular arc groove (3) is located away from the center of the movable ring (1) or the stationary ring.

9. The dry gas seal structure having a spider-web type slot of claim 1, wherein, The included angle between two adjacent linear flow grooves (2) is 2-5°, and the groove depth of the linear flow groove (2) and the circular arc groove (3) is 5-20 μm.

10. A dry gas seal structure having a spider-web type slot as set forth in claim 2, wherein, The groove depth of the backflow groove (5) is smaller than that of the linear flow groove (2) and the circular arc groove (3).

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