CN212273039U - Mechanical seal end face structure capable of rotating in two directions - Google Patents
Mechanical seal end face structure capable of rotating in two directions Download PDFInfo
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- CN212273039U CN212273039U CN202020364189.3U CN202020364189U CN212273039U CN 212273039 U CN212273039 U CN 212273039U CN 202020364189 U CN202020364189 U CN 202020364189U CN 212273039 U CN212273039 U CN 212273039U
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Abstract
The utility model provides a but two-way rotatory mechanical seal's end face structure, include: sealing the end face and the end face groove; the end surface groove has a first dynamic pressure groove communicating with the outside of the seal end surface, a second dynamic pressure groove communicating with the inner end of the first dynamic pressure groove, the width of the inner end of the first dynamic pressure groove is smaller than the width of the outer end of the second dynamic pressure groove, and the second dynamic pressure groove has a third side and a fourth side which are close to each other in the inward direction along the outer end of the second dynamic pressure groove; the sealing end face can continuously compress gas in the end face groove when rotating in the forward direction or the reverse direction to form a stable gas film with certain pressure, so that the sealing performance is improved, and the abrasion and even damage to the sealing end face are avoided; and set up the structure of end face groove for all can produce effective dynamic pressure effect when positive reverse rotation and guarantee that the sealed end face is opened, guarantee the rigidity of air film, improve sealed comprehensive properties, result of use and life-span.
Description
Technical Field
The utility model belongs to the technical field of mechanical end face seal, concretely relates to but two-way rotatory mechanical seal's end face structure.
Background
Mechanical seals have been widely used in various fluid machines and devices as a kind of shaft end seal device. Although it does not belong to the technical field of decisive significance, the quality of the sealing performance may determine whether the device can be operated. In order to meet the sealing requirement of a high-parameter working condition and prolong the service life of mechanical seal, one effective method is to arrange a groove with a certain structural shape on the end face of a seal ring, improve the lubrication of the seal end face by the hydrodynamic effect between the end faces of the seal ring, and convert the solid friction between the seal rings into the fluid friction of the end face, namely non-contact mechanical seal.
Dry gas seal is a shaft seal device of rotating machinery, and is widely applied to the fields of petrochemical industry, aerospace, nuclear power ships and the like because of the advantages of non-contact, no leakage, low energy consumption, long service life, good stability and the like. At present, dry gas seals mostly rotate in one direction, and when the rotating machine rotates in the opposite direction, the stable operation of the rotating machine cannot be met. Although the dry gas seal capable of rotating in two directions has been reported, when the equipment runs at high speed, the existing dry gas seal capable of rotating in two directions still has the problems of insufficient opening force of the seal end face, low rigidity of the gas film, poor anti-interference performance and the like.
Disclosure of Invention
The utility model discloses to the above-mentioned problem that exists among the prior art, provide a but two-way rotation's mechanical seal's end face structure, have bigger opening power and fluid film rigidity, be applicable to the rotating machinery axle head seal of high-speed operation.
In order to achieve the technical purpose, the utility model adopts the following technical scheme:
a face structure of a bi-directionally rotatable mechanical seal, comprising:
the sealing end face is used for realizing sealing, and a plurality of end face grooves symmetrically arranged along the radial direction are arranged in the circumferential direction of the sealing end face;
and an end surface groove having a first dynamic pressure groove communicating with an outer side of the seal end surface, a second dynamic pressure groove communicating with an inner end of the first dynamic pressure groove, a width of the inner end of the first dynamic pressure groove being smaller than a width of an outer end of the second dynamic pressure groove, the second dynamic pressure groove having a third side and a fourth side which are close to each other in an inward direction along an outer end of the second dynamic pressure groove.
Further, the first dynamic pressure groove has a first side and a second side which are close to each other in an outward direction along an inner end of the first dynamic pressure groove.
Further, the width of the outer end of the first dynamic pressure groove is equal to the width of the inner end of the second dynamic pressure groove.
Further, the first side and the second side are straight lines and are symmetrical along the symmetry axis of the end surface groove.
Further, the included angle between the first side edge and the symmetry axis is 45 degrees.
Further, the third side and the fourth side are straight lines and symmetrical along the symmetry axis of the end surface groove.
Further, the included angle between the third side edge and the symmetry axis is 45 degrees.
Further, the second dynamic pressure groove is an isosceles trapezoid groove.
Further, the dimension of the second dynamic pressure groove in the radial direction is 1.5 to 3 larger than the dimension of the first dynamic pressure groove in the radial direction.
Furthermore, the ratio of the outer diameter to the inner diameter of the sealing end face is 1.25-1.41.
Further, the ratio of the radius of the outer end point of the third side edge to the inner diameter of the sealing end face is 1.19-1.35.
Further, the ratio of the radius of the inner endpoint of the first side edge to the inner diameter of the sealing end face is 1.18-1.34.
Further, the inner end of the first dynamic pressure groove corresponds to a central angle of 10 to 14 degrees on the circumference of the seal end face.
Further, the outer end of the second dynamic pressure groove corresponds to a central angle of 17 to 21 degrees on the circumference of the sealing end face.
Further, an included angle between symmetrical axes of two adjacent end surface grooves on the sealing end surface is 20-36 degrees.
Further, the groove depth of the end surface groove is 2 μm to 10 μm.
The utility model provides a but two-way rotatory mechanical seal's terminal surface structure, through set up a plurality of radial symmetry terminal surface grooves that set up at the seal end face, make the seal end face can let gas carry on the continuous compression in the terminal surface groove when forward rotation or reverse rotation, form the stable gas film that has certain pressure, help to increase sealing performance, and avoid to the wearing and tearing of seal end face, even destroy; and set up the structure of end face groove for all can produce effective dynamic pressure effect when positive reverse rotation and guarantee that the sealed end face is opened, guarantee the rigidity of air film, improve sealed comprehensive properties, result of use and life-span.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when read in conjunction with the accompanying drawings.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of an end face structure of a bidirectional rotatable mechanical seal according to the present invention;
fig. 2 is an enlarged view of a groove at one end surface in fig. 1.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention. In the description of the present invention, it is to be noted that the terms "inner" and "outer" are used in the center near the seal end face. The terminology is for the purpose of describing the invention only and is for the purpose of simplifying the description, and is not intended to indicate or imply that the device or element so referred to must be in a particular orientation, constructed and operated, and is not to be considered limiting of the invention. Moreover, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Referring to fig. 1-2, the present invention provides an embodiment of a two-way rotatable end face structure of a mechanical seal, the mechanical seal has a rotating ring and a stationary ring that are sealed by matching, one end of the rotating ring and the stationary ring that are close to each other are both provided with a sealing end face, and the sealing end face on the rotating ring and the sealing end face on the stationary ring are sealed by contact or non-contact.
The end face structure of the mechanical seal capable of rotating in two directions comprises a seal end face 10, and the seal end face 10 can be positioned on a static ring or a dynamic ring. A plurality of end surface grooves 1 are arranged in the circumferential direction of the sealing end surface 10, the end surface grooves 1 are symmetrically arranged in the radial direction, the end surface grooves 1 are provided with a first dynamic pressure groove 11 and a second dynamic pressure groove 12, the first dynamic pressure groove 11 is communicated with the outer side of the sealing end surface 10, and the outer end 120 of the second dynamic pressure groove 12 is communicated with the inner end of the first dynamic pressure groove 11. The size of the end face groove 1 in the vertical direction of the symmetry axis of the end face groove 1 on the sealing end face 10 is the width of the end face groove 1, the width of the inner end of the first dynamic pressure groove 11 is smaller than the width of the outer end of the second dynamic pressure groove 12, and the second dynamic pressure groove 12 has a third side 121 and a fourth side 122 which are close to each other in the inward direction along the outer end of the second dynamic pressure groove 12, so that gradually narrowed corners are formed on the two sides of the outer side of the second dynamic pressure groove 12, when the sealing end face 10 rotates at a relatively high speed, the gradually shrinking structure can form a pressure wedge, the opening force of the sealing end face is increased, the rigidity of a gas film is ensured, the non-contact sealing of the sealing end face 10 is ensured, and the comprehensive performance, the using effect and the service. Through setting up a plurality of radial symmetry's terminal surface groove 1 at seal face 10 for seal face 10 can all let gas carry out continuous compression in terminal surface groove 1 when forward rotation or reverse rotation, forms the stable gas film that has certain pressure, is favorable to increasing sealing performance, and avoids wearing and tearing, destruction even to seal face.
The first dynamic pressure groove 11 and the second dynamic pressure groove 12 are arranged in a connected manner in the inward and outward direction, the first dynamic pressure groove 11 has a first side 111 and a second side 112 which are close to each other in the outward direction along the inner end of the first dynamic pressure groove 11; so that the first dynamic pressure grooves 11 increase in width in the inward direction, so that the gas entering from the communication port with the outside of the seal end face 1 is concentrated in the first dynamic pressure grooves 11. The first side 111 and the second side 112 are straight lines, and the first side 111 and the second side 112 are symmetrical along the symmetry axis of the end surface groove 1. Preferably, the angle between the first side 111 and the symmetry axis is 45 °, and the angle between the second side 112 and the symmetry axis is 45 °.
The width of the outer end of the first dynamic pressure groove 11 is equal to the width of the inner end of the second dynamic pressure groove 12. The dimension of the second dynamic pressure groove 12 in the radial direction is larger than the dimension of the first dynamic pressure groove 11 in the radial direction, the dimension of the second dynamic pressure groove 12 in the radial direction is the maximum dimension of the second dynamic pressure groove 12 in the radial direction, and the dimension of the first dynamic pressure groove 11 in the radial direction is the maximum dimension of the first dynamic pressure groove 11 in the radial direction; the dimension of the second dynamic pressure groove 12 in the radial direction is preferably 1.5 to 3 larger than the dimension of the first dynamic pressure groove 11 in the radial direction.
The second dynamic pressure generating groove 12 is an isosceles trapezoid groove, that is, the third side 121 and the fourth side 122 are straight lines, the inner end line 123 and the outer end line 124 of the second dynamic pressure generating groove 12 are also straight lines, and the inner ends of the first side 111 and the second side 112 intersect with the outer end line 124. The end surface groove 1 is formed by the inner end line 123, the outer end line 124, the third side 121, the fourth side 122, the first side 111 and the second side 112 in a surrounding manner, and all the ends are straight lines, so that the end surface groove 1 is simple in structure and convenient to machine and manufacture. The third side 121 and the fourth side 122 are symmetrical along the symmetry axis of the end surface groove 1, the included angle between the third side 121 and the symmetry axis is 45 °, and the included angle between the fourth side 122 and the symmetry axis is 45 °.
In other embodiments, one or more of the inner end line 123, the outer end line 124, the third side edge 121, the fourth side edge 122, the first side edge 111, and the second side edge 112 may be curved.
The outer end of the first dynamic pressure groove 11 is an arc coinciding with the outer edge of the sealing end face 10, the sealing end face 10 is of an annular structure, the ratio of the outer diameter R1 of the sealing end face 10 to the inner diameter R5 of the sealing end face 10 is 1.25-1.41, the outer diameter is an outer radius, and the inner diameter is an inner radius; a plurality of end surface grooves 1 are uniformly arranged on the sealing end surface 10, and the included angle between the symmetry axes of two adjacent end surface grooves 1 on the sealing end surface 10 is 20-36 degrees.
The ratio of the radius R3 at the inner end point of the first side 111 to the inner diameter R5 of the seal end face 10 is 1.18 to 1.34, the inner end point of the first side 111, that is, the intersection of the first side 111 and the outer end line 124, that is, the end point of the inner end of the first dynamic pressure groove 11, which is far from the axis of symmetry, is equal to the radius at the inner end point of the first side 111 and the radius at the inner end point of the second side 112. The central angle alpha 1 of the inner end of the first dynamic pressure groove 11 corresponding to the circumference of the sealing end surface 11 is 10-14 degrees.
The ratio of the radius R2 at the outer end point of the third side edge 121 to the inner diameter R5 of the seal end face 10 is 1.19 to 1.35, and the outer end point of the third side edge 121, that is, the intersection point of the third side edge 121 and the outer end line 124, that is, the end point of the outer end of the second dynamic pressure groove 12, is far away from the symmetry axis. The outer end of the second dynamic pressure groove 12 corresponds to a central angle α 2 of 17 ° to 21 ° on the circumference of the seal end face 10.
The inclination angle β 1 of the first dynamic pressure groove 11 is 45 °, the inclination angle β 2 of the second dynamic pressure groove 12 is 135 °, the groove depth of the first dynamic pressure groove 11 is equal to the groove depth of the second dynamic pressure groove 12, the groove depth of the first dynamic pressure groove 11 is 2 μm to 10 μm, or the groove depth of the end surface groove 1 is 2 μm to 10 μm.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (10)
1. A face structure of a bi-directionally rotatable mechanical seal, comprising:
the sealing end face is used for realizing sealing, and a plurality of end face grooves symmetrically arranged along the radial direction are arranged in the circumferential direction of the sealing end face;
and an end surface groove having a first dynamic pressure groove communicating with an outer side of the seal end surface, a second dynamic pressure groove communicating with an inner end of the first dynamic pressure groove, a width of the inner end of the first dynamic pressure groove being smaller than a width of an outer end of the second dynamic pressure groove, the second dynamic pressure groove having a third side and a fourth side which are close to each other in an inward direction along an outer end of the second dynamic pressure groove.
2. An end face structure according to claim 1, wherein the first dynamic pressure groove has a first side and a second side which are close to each other in an outward direction along an inner end of the first dynamic pressure groove.
3. An end face structure according to claim 1, wherein the width of the outer end of the first dynamic pressure groove is equal to the width of the inner end of the second dynamic pressure groove.
4. An end face structure according to claim 2, wherein the first and second side edges are straight and symmetrical along the symmetry axis of the end face groove, and the angle between the first side edge and the symmetry axis is 45 °.
5. An end face structure according to claim 1, wherein the third and fourth sides are straight and symmetrical about an axis of symmetry of the end face groove, the third side making an angle of 45 ° with the axis of symmetry.
6. An end face structure according to claim 1, wherein the second dynamic pressure grooves are isosceles trapezoidal grooves.
7. The end face structure according to any one of claims 1 to 6, wherein the dimension of the second dynamic pressure groove in the radial direction is 1.5 to 3 larger than the dimension of the first dynamic pressure groove in the radial direction.
8. An end face structure according to claim 2, wherein the ratio of the radius at the inner end point of the first side to the inner diameter of the sealing end face is 1.18-1.34.
9. An end face structure according to any one of claims 1 to 6, wherein the ratio of the radius at the outer end point of the third side edge to the inner diameter of the sealing end face is 1.19 to 1.35 °.
10. An end face structure according to any one of claims 1 to 6, wherein the inner end of the first dynamic pressure groove corresponds to a central angle of 10 ° to 14 ° on the circumference of the seal end face, and the outer end of the second dynamic pressure groove corresponds to a central angle of 17 ° to 21 on the circumference of the seal end face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020364189.3U CN212273039U (en) | 2020-03-20 | 2020-03-20 | Mechanical seal end face structure capable of rotating in two directions |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020364189.3U CN212273039U (en) | 2020-03-20 | 2020-03-20 | Mechanical seal end face structure capable of rotating in two directions |
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| CN212273039U true CN212273039U (en) | 2021-01-01 |
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| CN202020364189.3U Active CN212273039U (en) | 2020-03-20 | 2020-03-20 | Mechanical seal end face structure capable of rotating in two directions |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114483962A (en) * | 2022-04-02 | 2022-05-13 | 东营海森密封技术有限责任公司 | Wing-shaped dynamic pressure non-contact sealing structure |
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2020
- 2020-03-20 CN CN202020364189.3U patent/CN212273039U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114483962A (en) * | 2022-04-02 | 2022-05-13 | 东营海森密封技术有限责任公司 | Wing-shaped dynamic pressure non-contact sealing structure |
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