CN110953346A - Nearly complete concentric non-contact carbocycle seal structure - Google Patents
Nearly complete concentric non-contact carbocycle seal structure Download PDFInfo
- Publication number
- CN110953346A CN110953346A CN201911207019.2A CN201911207019A CN110953346A CN 110953346 A CN110953346 A CN 110953346A CN 201911207019 A CN201911207019 A CN 201911207019A CN 110953346 A CN110953346 A CN 110953346A
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- China
- Prior art keywords
- sealing ring
- contact
- ring
- seal
- elastic element
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
Abstract
The invention relates to a nearly complete concentric non-contact carbon ring sealing structure, which comprises a sealing ring and a radial elastic element arranged on the radial outer side of the sealing ring, wherein the sealing ring is arranged in a cavity, the radial elastic element is restrained by the cavity, the radial elastic element has radial elastic force on the sealing ring, so that the sealing ring is sleeved on a to-be-sealed piece in a concentric non-contact manner, the radial elastic force of the radial elastic element can balance the gravity of the sealing ring on one hand, and on the other hand, the radial displacement of the sealing ring can be ensured not to be generated when the sealing ring is disturbed by the outside, so that the sealing ring is not in contact with the to-be-sealed piece, the.
Description
Technical Field
The invention relates to the technical field of mechanical sealing, in particular to a nearly complete concentric non-contact carbon ring sealing structure.
Background
The carbon ring seal has simple structure and stable performance, and is widely applied to various rotary devices as shaft end seal. The main working principle of the carbon ring seal is realized by controlling the leakage amount of a sealing medium or a process medium within an allowable range through a small clearance formed by a static sealing ring and a rotating shaft or a shaft sleeve.
In a common carbon ring seal, when the device is static, the seal ring can contact with a shaft or a shaft sleeve due to self gravity. When the device is started, the shaft or the shaft sleeve can contact with the sealing ring to cause abrasion, so that the service life of the sealing ring is influenced, and the service life of the whole carbon ring seal is further influenced; on the other hand, the shaft or the shaft sleeve can be abraded, and the contact force can also increase the vibration of the rotor in high-speed equipment, so that the stability of the whole rotor is influenced.
In addition, the leakage amount of the carbon ring seal has a direct relation with the eccentricity e of the seal ring and the shaft or the shaft sleeve, as shown in fig. 3, when the seal ring and the shaft or the shaft sleeve are completely eccentric, the eccentricity e is 1, and the leakage amount is maximum at this time; as shown in fig. 4, when the seal ring is completely concentric with the shaft or the sleeve, the eccentricity e is 0, and the leakage amount is minimized. According to the calculation formula of the leakage amount of the carbon ring seal, when the seal is in a complete eccentric state (the eccentricity e is equal to 1), the leakage amount is 2.5 times of that when the seal is in a complete concentric state (the eccentricity e is equal to 0).
Therefore, how to ensure that the sealing ring does not contact with the shaft or the shaft sleeve and the eccentricity ratio of the sealing ring and the shaft or the shaft sleeve reaches the minimum is the key for controlling the leakage amount.
Disclosure of Invention
The invention aims to solve the problems and provide a nearly-complete-concentric non-contact carbon ring sealing structure, which does not contact with a shaft or a shaft sleeve when equipment is static or in operation, minimizes the eccentricity ratio of a sealing ring and the shaft or the shaft sleeve, approaches a complete-concentric state and minimizes the leakage amount.
The purpose of the invention is realized by the following technical scheme:
the utility model provides a nearly totally concentric non-contact carbocycle seal structure, includes a sealing ring and locates the radial elastic element of this sealing ring radial outside, the sealing ring is installed in a cavity, radial elastic element quilt the cavity constraint, this radial elastic element is right the sealing ring has radial elasticity, makes the concentric non-contact cover of sealing ring is established on treating the sealing member, and radial elastic element's radial elasticity can balanced sealing ring self gravity on the one hand, and on the other hand can guarantee that the sealing ring does not produce radial displacement when receiving external disturbance, makes the sealing ring with treat that the sealing member does not produce the contact, and the eccentricity reaches the minimum, and leakage quantity is minimum.
Further, the radial elastic element is a spring energy storage ring, a tension spring, a wave spring or an O-shaped ring, and the radial elastic force generated by the radial elastic element is opposite to the gravity direction of the sealing ring.
Further, an axial elastic element is arranged on the end face of the axial side of the sealing ring, and the axial elastic element generates axial thrust to enable the sealing ring to be attached to the inner wall of the cavity.
Furthermore, the axial elastic element is a spring, the spring is arranged in a spring hole, the generated thrust enables the sealing ring to be tightly attached to the inner wall of the cavity to form sealing, the static friction force between the sealing ring and the inner wall of the cavity is increased, and the gravity of the sealing ring can be further effectively resisted.
The sealing ring, the radial elastic element and the axial elastic element are further arranged in a supporting part, the supporting part comprises a supporting cavity and a spring seat connected with the supporting cavity, and the cavity is arranged between the supporting cavity and the spring seat.
Furthermore, the supporting cavity is positioned on the low-pressure atmosphere side, the spring seat is positioned on the high-pressure medium side, and the directions of the medium pressure and the axial elastic force of the axial elastic element are consistent.
Furthermore, an anti-rotation pin for preventing the sealing ring from rotating around the to-be-sealed piece is further arranged between the sealing ring and the spring seat, so that the sealing ring is effectively prevented from rotating in the circumferential direction.
Further, the sealing ring is of a unitary type or a split type.
Further, the sealing ring is a carbocyclic ring.
Further, the to-be-sealed member is a shaft or a shaft sleeve.
According to the invention, by arranging the radial elastic element (such as the spring energy storage ring) and calculating the force value of the radial elastic element, the self gravity of the sealing ring is balanced by the radial elastic force of the radial elastic element, and meanwhile, the sealing ring can be ensured not to generate radial displacement when being disturbed by the outside, so that the sealing ring is concentrically sleeved on the sealing member to be sealed in a non-contact manner, the sealing ring is not in contact with the sealing member to be sealed, a nearly complete concentric non-contact sealing structure is formed, the eccentricity is minimum at this moment, and the leakage amount is minimum.
In addition, the static friction force of the contact end face of the sealing ring and the cavity is increased by arranging the axial elastic element, and the sealing ring can not move downwards under the action of gravity even in a static state, so that the sealing ring and the shaft or the shaft sleeve are ensured to be in a state of being close to complete concentricity.
This structure is when equipment starts, and the sealing ring can not produce contact wear with axle or axle sleeve, and the life-span that the carbocycle is sealed increases. The carbon ring seal does not generate any interference on the equipment, so that the stability of the equipment is guaranteed; in addition, because the sealing ring and the shaft or the shaft sleeve are in an almost concentric state, the eccentricity approaches to 0, and the leakage amount of the sealing can reach the designed minimum value. In addition, the whole structure is still in a floating type, and when the shaft or the shaft sleeve is contacted with the sealing ring due to other reasons such as equipment failure, the shaft or the shaft sleeve cannot be clamped by the seal.
Drawings
FIG. 1 is a schematic diagram of the overall structure of an apparatus according to an embodiment of the present invention;
FIG. 2 is a graph illustrating a force analysis of a sealing ring of an apparatus according to an embodiment of the present invention;
FIG. 3 is a schematic view of the seal ring in a fully eccentric condition with the shaft or sleeve;
FIG. 4 is a schematic view of the complete concentricity of the seal ring and the shaft or sleeve;
in the figure: the device comprises a supporting cavity 1, a spring seat 2, a spring energy storage ring 3, a sealing ring 4, a spring 5, a shaft or shaft sleeve 6 and an anti-rotation pin 7.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Examples
The utility model provides a nearly totally concentric non-contact carbocycle seal structure, as shown in figure 1, including a sealing ring 4 and locate the radial elastic element in this sealing ring 4 radial outside, this embodiment radial elastic element adopts spring energy storage circle 3, sealing ring 4 horizontal cover is located on treating sealed axle or axle sleeve 6, the radial elasticity that spring energy storage circle 3 produced is opposite with sealing ring 4 gravity direction, sealing ring 4 is installed in the cavity, radial elastic element is by the cavity restraint, this radial elastic element makes the concentric non-contact cover of sealing ring 4 establish on treating the sealing member, radial elastic element's radial elasticity can balance sealing ring self gravity on the one hand, on the other hand can guarantee that the sealing ring does not produce radial displacement when receiving external disturbance, make sealing ring 4 and treat sealed axle or axle sleeve 6 and do not produce the contact, the eccentricity ratio reaches the minimum, leak the volume minimum.
In addition, the axial side end face of the sealing ring 4 is provided with an axial elastic element, specifically, a spring 5 can be adopted, the spring 5 is installed in a spring hole, the thrust generated by the spring 5 enables the sealing ring 4 to be tightly attached to the inner wall of the chamber to form sealing, and meanwhile, the static friction force between the sealing ring and the inner wall of the chamber is increased.
In this embodiment, sealing ring 4, spring energy storage circle 3 and spring 5 install in the supporting component, and the supporting component includes support cavity 1 and the spring holder 2 of being connected with support cavity 1, and the cavity is located and is supported between cavity 1 and the spring holder 2. The supporting cavity 1 is positioned on the low-pressure atmosphere side, the spring seat 2 is positioned on the high-pressure medium side, and the medium pressure is consistent with the axial elastic force direction of the spring 5. The sealing ring 4 is fixed on the spring seat 2 through an anti-rotation pin 7, and the sealing ring is prevented from rotating in the circumferential direction.
In order to ensure that the sealing ring is not in contact with the shaft or the shaft sleeve and the eccentricity ratio of the sealing ring and the shaft or the shaft sleeve is minimized, namely, the phenomenon shown in figure 3 is avoided, the sealing ring and the shaft or the shaft sleeve are completely eccentric, the eccentricity ratio e is 1, and the leakage rate is the largest at the moment, the spring energy storage ring 3 is arranged, the sealing ring is concentrically sleeved on the to-be-sealed piece in a non-contact manner, the sealing ring is not in contact with the to-be-sealed piece, the eccentricity ratio of the sealing ring and the to-be-sealed piece is minimized and is close to a completely concentric state, as shown in figure 4, the sealing ring and the shaft or the shaft sleeve are completely concentric, the eccentricity ratio. In the sealing structure, the spring energy storage ring 3 is positioned in a groove of the cavity and is compressed through the spring seat 2; the spring seat 2 is also provided with springs 5 with different numbers to press the sealing ring 4 on the end surface of the supporting cavity 1; there is a certain clearance between the sealing ring 4 and the shaft or bushing 6 and it is designed to be near perfect concentricity, the sealing ring 4 being prevented from rotating by the anti-rotation pin 7.
FIG. 2 is a graph of a force analysis of the seal ring, wherein:
g-seal ring gravity;
fr is the radial force of the spring energy storage ring;
ff is static friction between the seal ring and the support cavity;
f1-axial force due to differential pressure of the medium;
f2-axial force of spring.
The spring energy storage ring 3 can ensure that the whole sealing ring 4 is almost completely concentric with the shaft or the shaft sleeve, and the deformation generated by the spring energy storage ring 3 can be ensured to be small enough even if radial unbalanced force is generated due to disturbance by controlling the radial rigidity of the spring energy storage ring 3, so that the sealing ring and the shaft or the shaft sleeve are in an almost completely concentric state.
When equipment is static, sealing ring 4 receives the action of gravity, can produce the trend of downward motion, and sealing ring 4 receives spring 5 and medium pressure to laminate and supports on the cavity 1, realizes Ff ═ G through calculation control spring 5's axial force F2, and the static friction force of sealing ring 5 and support cavity 1 contact end face equals with sealing ring 5 gravity G promptly, and Fr ═ 0 promptly also can realize sealing ring 5 and do not move down under the action of gravity.
When the equipment starts, the sealing ring and the shaft or the shaft sleeve can not generate contact wear, and the service life of the carbon ring seal is prolonged. The carbon ring seal does not generate any interference on the equipment, and the stability of the equipment is guaranteed. In addition, because the sealing ring and the shaft or the shaft sleeve are in an almost concentric state, the eccentricity approaches to 0, and the leakage amount of the sealing can reach the designed minimum value. In addition, the whole structure is still in a floating type, and when the shaft or the shaft sleeve is contacted with the sealing ring due to other reasons such as equipment failure, the shaft or the shaft sleeve cannot be clamped by the seal.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. The nearly complete concentric non-contact carbon ring sealing structure is characterized by comprising a sealing ring and a radial elastic element arranged on the radially outer side of the sealing ring, wherein the sealing ring is arranged in a cavity, the radial elastic element is restrained by the cavity, the radial elastic element has radial elasticity on the sealing ring, and the radial elastic element enables the sealing ring to be sleeved on a to-be-sealed piece in a non-contact mode.
2. The near complete concentric non-contact carbocyclic seal structure according to claim 1, wherein said radial elastic element is a spring energy storage ring, a tension spring, a wave spring or an O-ring.
3. The nearly-perfect-concentric non-contact carbocyclic seal structure according to claim 1, wherein said seal ring is provided with an axial elastic element at its axial side end face, said axial elastic element generates axial thrust to make said seal ring abut against the inner wall of the chamber.
4. A near-perfect-concentric non-contact carbocyclic seal according to claim 3, wherein said axial elastic element is a spring.
5. The nearly-perfect-concentric non-contact carbocyclic seal structure of claim 3, wherein said seal ring, radial spring element and axial spring element are mounted in a support member, said support member comprising a support cavity and a spring seat connected to said support cavity, said cavity being disposed between said support cavity and said spring seat.
6. The nearly-perfect-concentric non-contact carbocyclic seal structure of claim 5, wherein said support cavity is on the low pressure atmosphere side and said spring seat is on the high pressure media side.
7. The nearly-perfect-concentric non-contact carbocyclic seal structure of claim 5, wherein an anti-rotation pin is further provided between said seal ring and said spring seat to prevent rotation of the seal around the member to be sealed.
8. The nearly-perfect-concentric non-contact carbocyclic seal structure of claim 1, wherein said seal ring is monolithic or segmented.
9. The nearly concentric non-contact carbocyclic seal structure of claim 1 wherein said seal ring is a carbocyclic ring.
10. The nearly-perfect-concentric non-contact carbocyclic seal structure of claim 1, wherein said seal to be sealed is a shaft or a shaft sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911207019.2A CN110953346A (en) | 2019-11-29 | 2019-11-29 | Nearly complete concentric non-contact carbocycle seal structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911207019.2A CN110953346A (en) | 2019-11-29 | 2019-11-29 | Nearly complete concentric non-contact carbocycle seal structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110953346A true CN110953346A (en) | 2020-04-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911207019.2A Pending CN110953346A (en) | 2019-11-29 | 2019-11-29 | Nearly complete concentric non-contact carbocycle seal structure |
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| Country | Link |
|---|---|
| CN (1) | CN110953346A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2498408Y (en) * | 2001-09-19 | 2002-07-03 | 左俊业 | Floated labyrinth spiral composite sealer |
| CN201827373U (en) * | 2009-09-17 | 2011-05-11 | 诸暨市铭洲机械有限公司 | Trisection type multi-groove annular floating seal ring |
| CN202690519U (en) * | 2012-07-25 | 2013-01-23 | 济南风机厂有限责任公司 | Elastic contact carbon ring sealing assembly of fan spindle |
| CN211398569U (en) * | 2019-11-29 | 2020-09-01 | 上海好米密封科技有限公司 | Nearly complete concentric non-contact carbocycle seal structure |
-
2019
- 2019-11-29 CN CN201911207019.2A patent/CN110953346A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2498408Y (en) * | 2001-09-19 | 2002-07-03 | 左俊业 | Floated labyrinth spiral composite sealer |
| CN201827373U (en) * | 2009-09-17 | 2011-05-11 | 诸暨市铭洲机械有限公司 | Trisection type multi-groove annular floating seal ring |
| CN202690519U (en) * | 2012-07-25 | 2013-01-23 | 济南风机厂有限责任公司 | Elastic contact carbon ring sealing assembly of fan spindle |
| CN211398569U (en) * | 2019-11-29 | 2020-09-01 | 上海好米密封科技有限公司 | Nearly complete concentric non-contact carbocycle seal structure |
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