CN106763779B - A kind of mechanical seal ring with more zigzag helicla flutes - Google Patents

A kind of mechanical seal ring with more zigzag helicla flutes Download PDF

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Publication number
CN106763779B
CN106763779B CN201611141162.2A CN201611141162A CN106763779B CN 106763779 B CN106763779 B CN 106763779B CN 201611141162 A CN201611141162 A CN 201611141162A CN 106763779 B CN106763779 B CN 106763779B
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spiral
wire
point
groove
logarithmic
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CN106763779A (en
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宋鹏云
邓成香
陈果
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Yunnan Fluid Planning And Research Institute Co ltd
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Kunming University of Science and Technology
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16JPISTONS; CYLINDERS; SEALINGS
    • F16J15/00Sealings
    • F16J15/16Sealings between relatively-moving surfaces
    • F16J15/164Sealings between relatively-moving surfaces the sealing action depending on movements; pressure difference, temperature or presence of leaking fluid
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16JPISTONS; CYLINDERS; SEALINGS
    • F16J15/00Sealings
    • F16J15/16Sealings between relatively-moving surfaces
    • F16J15/162Special parts or details relating to lubrication or cooling of the sealing itself
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16JPISTONS; CYLINDERS; SEALINGS
    • F16J15/00Sealings
    • F16J15/16Sealings between relatively-moving surfaces
    • F16J15/40Sealings between relatively-moving surfaces by means of fluid
    • F16J15/406Sealings between relatively-moving surfaces by means of fluid by at least one pump

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mechanical Sealing (AREA)

Abstract

The present invention relates to a kind of mechanical seal ring with more zigzag helicla flutes, multiple helicla flutes along the distribution of end face even circumferential are provided on sealing ring end face, each helicla flute slot root is zigzag.Invention enhances the dynamic pressure effect of mechanical seal ring end face fluid, the range for generating dynamic pressure effect is increased, so that mechanical seal forms stable fluid film during operation, end face friction level reduces, and service life is greatly extended.

Description

Mechanical sealing ring with multi-zigzag spiral groove
Technical Field
The invention relates to a mechanical sealing ring with a multi-zigzag spiral groove, which belongs to the technical field of mechanical sealing and is particularly suitable for sealing the end faces of shaft ends of various rotary machines such as pumps, compressors, reaction kettles and the like.
Background
Mechanical seals, such as dry gas seals for sealing gases and upstream pumping mechanical seals for sealing liquids, are widely used with their unique performance advantages in centrifugal compressors, fans, reactors, and the like, on high speed rotating machines. The mechanical seal is realized by arranging dynamic pressure grooves with the molded lines of spiral lines, straight lines or circular arc lines on the seal end surface, and the spiral grooves are the most typical of various dynamic pressure grooves. When the movable ring rotates, a gas medium is pumped into the sealing end face by utilizing the strong dynamic and static pressure effect of the dynamic pressure groove, the fluid entering the sealing end face is blocked and pressurized at the groove root, and certain dynamic and static pressure of the fluid is generated to push the end face away, so that the mechanical seal can be maintained in the non-contact operation under the condition of a layer of micron-sized gas film, but the problems of high leakage rate, limited bearing capacity of the fluid film, insufficient rigidity of the fluid film and the like still exist in the conventional spiral groove mechanical seal widely used in the industry, and failure accidents occur.
Disclosure of Invention
The invention aims to provide a mechanical sealing ring with a multi-zigzag spiral groove, which has the advantages of strong fluid dynamic pressure effect, large fluid film bearing capacity and fluid film rigidity and low leakage rate.
The technical scheme of the invention is as follows:
a mechanical sealing ring with multi-zigzag spiral grooves, one side of the end surface of the sealing ring is a high-pressure side, namely an upstream, and the other side is a low-pressure side, namely a downstream, 3-20 spiral grooves uniformly distributed along the circumference of the end surface are arranged on the end surface of the sealing ring, the opening of each spiral groove is arranged on the high-pressure side of the end surface, the root of each spiral groove is zigzag, a sealing dam is formed in the non-grooved area of the end surface of the sealing ring, and the ratio of the table groove to the table groove (the ratio of the arc length ofa 2/ a 1=0.1~5;
The contour line of each spiral groove is composed of logarithmic spirals with equal spiral anglesα0 DEG < |α∣<90°;
The number of the sawteeth at the root of each spiral groove is 2-10;
the depth of the groove is 2 to 100 μm.
The single multi-zigzag spiral groove is constructed by the following steps: with logarithmic spiral profilel 1Is a reference line andOas a circle center, respectively rotate clockwiseφ、φ......(n-1)×φAngle-derived auxiliary logarithmic spirall 2l 3..l nWherein(in the formula, wherein,Nthe number of the spiral grooves formed on the end surface of the sealing ring,nthe number of teeth at the root of the spiral groove), andl 1l 2.....l narc of circle with groove rootl gRespectively at the intersection points ofO 1O 2......O n(ii) a Logarithmic spiral contour linel 1To be provided withO 1Rotate clockwise as the center of a circleθAngle-derived auxiliary logarithmic spirall 1"; logarithmic spiral contour linel nTo be provided withO nRotate counterclockwise as a circle centerγAuxiliary helix for angle acquisitionThreadl n', wherein the clamping is in the form of a logarithmic spiral profilel 1Andl nintermediate auxiliary logarithmic spirall 2l 3......l n-1Are respectively provided withO 2O 3......O n-1Rotate counterclockwise as a circle centerγAngle-derived auxiliary logarithmic spirall 2'、l 3'......l n-1', auxiliary logarithmic spirall 2l 3......l n-1Then useO 2O 3......O n-1Rotate clockwise as the center of a circleθAngle-derived auxiliary logarithmic spirall 2"、l 3"......l n-1"; auxiliary logarithmic spirall 1"sum-aided logarithmic spirall 2' intersect at point A1Auxiliary logarithmic spirall 2"sum-aided logarithmic spirall 3' intersect at point A2Analogize with the above to assist the logarithmic spirall n-1"sum-aided logarithmic spirall n' intersect at point An-1(ii) a Contour line of multi-sawtooth type spiral groovel 1Point, pointO 1Wire, wirel 1", point A1Wire, wirel 2', pointO 2Wire, wirel 2", point A2Wire, wirel 3', pointO 3Wire, wirel 3".n-1Wire, wirel n', pointO nWire, wirel nEnclosing;
0°<∣θ∣≤90°,0°<∣γ∣<18°。
the mechanical sealing ring with the multi-zigzag spiral groove can be used for machining end surface micro-modeling by adopting processes such as electrochemical corrosion, electric spark, laser machining and the like, and the machining precision is detected by utilizing a non-contact optical profiler.
The mechanical sealing ring with the multi-zigzag spiral groove can be used as a moving ring or a static ring in a mechanical sealing structure, or the moving ring and the static ring can be the sealing rings at the same time.
The invention has the beneficial effects that:
the multi-zigzag spiral groove is formed in the surface of the sealing ring of the mechanical seal, so that a stronger compression effect can be generated on fluid, a better fluid dynamic pressure effect is achieved, the bearing capacity and the anti-interference capacity of the seal under a high-speed working condition are stronger, the lubricating state of the mechanical seal end face is effectively improved, the frictional wear degree of the seal end face is reduced, the service life of a sealing element is prolonged, the long-term stable operation of equipment is guaranteed, and the potential safety hazard of the equipment is eliminated.
Drawings
FIG. 1 is a drawing ofnA schematic diagram of a multi-zigzag spiral groove mechanical seal ring when = 3;
FIG. 2 isnA schematic diagram of a construction process of one groove of the multi-zigzag spiral groove mechanical seal ring when the mechanical seal ring is in the state of = 3;
FIG. 3 is a drawing showingnThe outline diagram of one grooved wheel of the multi-zigzag spiral groove mechanical seal ring is as follows when the number is 3;
FIGS. 4A and 4B arenAnd the outline of one sheave of the multi-zigzag spiral groove mechanical seal ring is schematic when the number is = 9.
Detailed Description
Example 1
As shown in figure 1, one side of the end surface of the sealing ring is a high-pressure side, namely an upstream side, the other side of the end surface of the sealing ring is a low-pressure side, namely a downstream side, the end surface of the sealing ring is provided with 10 spiral grooves which are uniformly distributed along the circumference of the end surface, the spiral grooves are opened on the high-pressure side of the end surface, the root of each spiral groove is in a zigzag shape, and the root of each spiral groove isThe number of the saw teeth is 3; the non-grooved area of the end face of the sealing ring forms a sealing dam, the ratio of the platform groove (the ratio of the arc length of the outer circumference of the non-grooved area to the arc length of the outer circumference of the grooved area)a 2/ a 1= 1; the groove depth is 5 μm;
the contour line of each spiral groove is composed of logarithmic spirals with equal spiral anglesα=15°。
The single multi-zigzag spiral groove is constructed by the following steps: with logarithmic spiral profilel 1Is a reference line andOclockwise rotating by 9 degrees and 18 degrees respectively to obtain an auxiliary logarithmic spiral line by taking the central point as the circle centerl 2And logarithmic spiral contour linel 3And is andl 1l 2l 3arc of circle with groove rootl gRespectively at the intersection points ofO 1O 2O 3(ii) a Logarithmic spiral contour linel 1To be provided withO 1Rotate clockwise as the center of a circleθAngle-derived auxiliary logarithmic spirall 1"; logarithmic spiral contour linel 3To be provided withO 3Rotate counterclockwise as a circle centerγAngle-derived auxiliary helixl 3', auxiliary logarithmic spirall 2To be provided withO 2Rotate counterclockwise as a circle centerγAngle-derived auxiliary logarithmic spirall 2', auxiliary logarithmic spirall 2Then useO 2Rotate clockwise as the center of a circleθAngle-derived auxiliary logarithmic spirall 2"; auxiliary logarithmic spirall 1"sum-aided logarithmic spirall 2' intersect at point A1Auxiliary logarithmic spirall 2"sum-aided logarithmic spirall 3' intersect at point A2(ii) a Contour line of three-zigzag helical groovel 1Point, pointO 1Wire, wirel 1", point A1Wire, wirel 2', pointO 2Wire, wirel 2", point A2Wire, wirel 3', pointO 3Wire, wirel 3Is enclosed as shown in the figure2.3, respectively. Wherein,θ=30°,γ=18°。
compared to an equivalent non-serrated helical groove: inner diameter of sealing ring with sawtooth-free spiral groove and three sawtooth-shaped spiral grooveR i=20mm, radius of groove rootR g=27mm, outer diameterR o=30mm, helix angleα=15 °, number of grooves 10, equilibrium film thicknessh b=10 μm and groove depth ofh=5 μm. And density of the sealed mediumρ=1.293kg/m3Viscosity ofμ=1.76×10-6Pa.s, rotational speed of the sealing ringωPressure at outer diameter of =1000rad/sp oPressure at inner diameter of =501325Pap i=101325Pa。
Non-sawtooth spiral groove sealing ring end face opening forceF o493N, leakage RateS tIs 4.66X 10-2kg/s; opening force of three-saw-tooth spiral groove sealing ring end faceF o512N, leakage RateS tIs 4.52 multiplied by 10-2kg/s; it can be seen that the three-zigzag spiral groove sealing ring has stronger bearing capacity than a non-zigzag spiral groove sealing ring, so that the lubricating state of the mechanical sealing end face is effectively improved, the frictional wear degree of the sealing end face is reduced, and the service life of the sealing element is prolonged. And the leakage rate of the three-zigzag spiral groove sealing ring is smaller than that of a non-zigzag spiral groove sealing ring, which shows that the three-zigzag spiral groove sealing ring is more beneficial to sealing of a medium under the same working condition.
Example 2
A mechanical seal ring with multi-zigzag spiral grooves, wherein one side of the end surface of the seal ring is a high-pressure side, namely an upstream side, and the other side of the end surface of the seal ring is a low-pressure side, namely a downstream side, 20 spiral grooves which are uniformly distributed along the circumference of the end surface are formed in the end surface of the seal ring, the opening of each spiral groove is arranged on the high-pressure side of the end surface, the root of each spiral groove is zigzag, and the number of the sawteeth; the non-grooved area of the end face of the sealing ring forms a sealing dam, and the ratio of the platform groove (the arc length of the outer circumference of the non-grooved area to the grooved area)Ratio of outer circumference arc length)a 2/ a 1= 1; the groove depth is 30 μm;
the contour line of each spiral groove is composed of logarithmic spirals with equal spiral anglesα=30°。
The single multi-zigzag spiral groove is constructed by the following steps: with logarithmic spiral profilel 1Is a reference line andOas the circle center, clockwise rotation is respectively carried out for 1.125 degrees, 2.25 degrees, 3.375 degrees, 4.5 degrees, 5.625 degrees, 6.75 degrees, 7.875 degrees and 9 degrees to obtain the auxiliary logarithmic spirall 2l 3l 4l 5l 6l 7l 8And logarithmic spiral contour linel 9And is andl 1l 2l 3l 4l 5l 6l 7l 8l 9arc of circle with groove rootl gRespectively at the intersection points ofO 1O 2O 3O 4O 5O 6O 7O 8O 9(ii) a Logarithmic spiral contour linel 1To be provided withO 1Rotate clockwise as the center of a circleθAngle-derived auxiliary logarithmic spirall 1"; logarithmic spiral contour linel 9To be provided withO 9Rotate counterclockwise as a circle centerγAngle-derived auxiliary helixl 9', auxiliary logarithmic spirall 2l 3l 4l 5l 6l 7l 8To be provided withO 2O 3O 4O 5O 6O 7O 8Rotate counterclockwise as a circle centerγAngle-derived auxiliary logarithmic spirall 2'、l 3'、l 4'、l 5'、l 6'、l 7'、l 8', auxiliary logarithmic spirall 2l 3l 4l 5l 6l 7l 8Then useO 2O 3O 4O 5O 6O 7O 8Rotate clockwise as the center of a circleθAngle-derived auxiliary logarithmic spirall 2"、l 3"、l 4"、l 5"、l 6"、l 7"、l 8"; auxiliary logarithmic spirall 1"sum-aided logarithmic spirall 2' intersect at point A1Auxiliary logarithmic spirall 2"sum-aided logarithmic spirall 3' intersect at point A2Auxiliary logarithmic spirall 3"sum-aided logarithmic spirall 4' intersect at point A3Auxiliary logarithmic spirall 4"sum-aided logarithmic spirall 5' intersect at point A4Auxiliary logarithmic spirall 5"sum-aided logarithmic spirall 6' intersect at point A5Auxiliary logarithmic spirall 6"sum-aided logarithmic spirall 7' intersect at point A6Auxiliary logarithmic spirall 7"sum-aided logarithmic spirall 8' intersect at point A7Auxiliary logarithmic spirall 8"sum-aided logarithmic spirall 9' intersect at point A8(ii) a Contour line of nine-sawtooth type spiral groovel 1Point, pointO 1Wire, wirel 1", point A1Wire, wirel 2', pointO 2Wire, wirel 2", point A2Wire, wirel 3', pointO 3Wire, wirel 3", point A3Wire, wirel 4', pointO 4Wire, wirel 4", point A4Wire, wirel 5', pointO 5Wire, wirel 5", point A5Wire, wirel 6', pointO 6Wire, wirel 6", point A6Wire, wirel 7', pointO 7Wire, wirel 7", point A7Wire, wirel 8', pointO 8Wire, wirel 8", point A8Wire, wirel 9', pointO 9Wire, wirel 9So as to be surrounded. Wherein,θ=15°,γ=5 degrees. As shown in fig. 4A and 4B.
Compared to an equivalent non-serrated helical groove: inner diameter of sealing ring with sawtooth-free spiral groove and nine sawtooth-shaped spiral grooveR i=20mm, radius of groove rootR g=27mm, outer diameterR o=30mm, helix angleα=30 °, number of grooves 20, equilibrium film thicknessh b=10 μm and groove depth ofh=30 μm. And density of the sealed mediumρ=1000kg/m3Viscosity ofμ=8.01×10-4Pa.s, rotational speed of the sealing ringωPressure at outer diameter of =300rad/sp oPressure at inner diameter of =501325Pap i=101325Pa。
Non-sawtooth spiral groove sealing ring end face opening forceF o290N, leakage RateS tIs 2.323 multiplied by 10-3kg/s; end face opening force of nine-sawtooth spiral groove sealing ringF oIs 301N, leakage rateS tIs 2.227X 10-3kg/s; it can be seen that the nine-sawtooth spiral groove sealing ring has stronger bearing capacity than a non-sawtooth spiral groove sealing ring, so that the lubricating state of the mechanical sealing end face is effectively improved, the frictional wear degree of the sealing end face is reduced, and the service life of the sealing element is prolonged. And the leakage rate of the nine-zigzag spiral groove sealing ring is smaller than that of the non-zigzag spiral groove sealing ring, which shows that the nine-zigzag spiral groove sealing ring is more beneficial to sealing of a medium under the same working condition.
The embodiments described in this specification are merely illustrative of implementations of the inventive concept and the scope of the present invention should not be considered limited to the specific forms set forth in the embodiments but includes equivalent technical means as would be recognized by those skilled in the art based on the inventive concept.

Claims (8)

1. A mechanical seal ring with multi-zigzag spiral grooves is characterized in that one side of the end face of the seal ring is a high-pressure side, namely an upstream side, the other side of the end face of the seal ring is a low-pressure side, namely a downstream side, the end face of the seal ring is provided with a plurality of spiral grooves which are uniformly distributed along the circumference of the end face, the spiral grooves are opened on the high-pressure side of the end face, the root of each spiral groove is zigzag, and a sealing dam is; the contour line of each spiral groove is formed by logarithmic spirals with equal spiral angles, and the top point of the zigzag groove root is formed by naturally extending and intersecting the logarithmic spirals forming the contour line; the groove roots of the spiral grooves are located at the same radial distance from the center of the sealing end face and are distributed along the circumferential direction.
2. The mechanical seal ring according to claim 1, wherein the number of the spiral grooves formed on the end surface of the seal ring is 3 to 20.
3. The mechanical seal ring according to claim 1, wherein the number of the serrations of each spiral groove root is 2 to 10.
4. The mechanical seal ring of claim 1, wherein the seal ring end land groove ratioa 2/ a 1=0.1~5。
5. The mechanical seal ring of claim 1, wherein a helix angle of a logarithmic spiral constituting the spiral groove profileα0 DEG < |α∣<90°。
6. The mechanical seal ring according to claim 1, wherein the spiral groove has a groove depth of 2 to 100 μm.
7. The mechanical seal ring of claim 1, wherein the single multi-zigzag helical groove is constructed by: with logarithmic spiral profilel 1Is a reference line andOas a circle center, respectively rotate clockwiseφ、φ......(n-1)×φAngle-derived auxiliary logarithmic spirall 2l 3..l nWherein(ii) in the formula (iv),Nthe number of the spiral grooves formed on the end surface of the sealing ring,nthe number of the saw teeth at the root part of the spiral groove is; and isl 1l 2.....l nArc of circle with groove rootl gRespectively at the intersection points ofO 1O 2......O n(ii) a Logarithmic spiral contour linel 1To be provided withO 1Rotate clockwise as the center of a circleθAngle-derived auxiliary logarithmic spirall 1"; logarithmic spiral contour linel nTo be provided withO nRotate counterclockwise as a circle centerγAngle-derived auxiliary helixl n', wherein the clamping is in the form of a logarithmic spiral profilel 1Andl nintermediate auxiliary logarithmic spirall 2l 3......l n-1Are respectively provided withO 2O 3......O n-1Rotate counterclockwise as a circle centerγAngle-derived auxiliary logarithmic spirall 2'、l 3'......l n-1', auxiliary logarithmic spirall 2l 3......l n-1Then useO 2O 3......O n-1Rotate clockwise as the center of a circleθAngle-derived auxiliary logarithmic spirall 2"、l 3"......l n-1"; auxiliary logarithmic spirall 1"sum-aided logarithmic spirall 2' intersect at point A1Auxiliary logarithmic spirall 2"sum-aided logarithmic spirall 3' intersect at point A2Analogize with the above to assist the logarithmic spirall n-1"sum-aided logarithmic spirall n' intersect at point An-1(ii) a Contour line of multi-sawtooth type spiral groovel 1Point, pointO 1Wire, wirel 1", point A1Wire, wirel 2', pointO 2Wire, wirel 2", point A2Wire, wirel 3', pointO 3Wire, wirel 3".n-1Wire, wirel n', pointO nWire, wirel nSo as to be surrounded.
8. The mechanical seal of claim 7Ring characterized by 0 °<∣θ∣≤90°,0°<∣γ∣<18°。
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CN110370483A (en) * 2019-08-27 2019-10-25 青岛科技大学 A kind of closed-smelting machine rotor sealing structure

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2166279Y (en) * 1993-07-23 1994-05-25 石油大学(华东) Sealing moving ring for gas medium
CN1118851A (en) * 1993-08-03 1996-03-20 约翰起重机有限公司 Improved non-contacting mechanical face seal
CN1401924A (en) * 2002-09-20 2003-03-12 徐万福 Helical flute and face mechanial seal composed of angular microflute group
CN201521636U (en) * 2009-08-20 2010-07-07 浙江工业大学 Gas face seal structure of three-dimensional shaped groove with bottom similar to feather texture
CN103090005A (en) * 2013-02-04 2013-05-08 北京理工大学 Spiral distributed multi-hole end face rotary sealing ring used on vehicle
CN103090006A (en) * 2013-02-04 2013-05-08 北京理工大学 Spiral groove rotary sealing ring with cone-shaped cross section and used on vehicle
CN203939991U (en) * 2014-05-29 2014-11-12 浙江工业大学 Dark link chute dynamic pressure type end surface mechanical sealing structure
CN206361151U (en) * 2016-12-12 2017-07-28 昆明理工大学 A kind of mechanical seal ring with many zigzag helicla flutes

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2166279Y (en) * 1993-07-23 1994-05-25 石油大学(华东) Sealing moving ring for gas medium
CN1118851A (en) * 1993-08-03 1996-03-20 约翰起重机有限公司 Improved non-contacting mechanical face seal
CN1401924A (en) * 2002-09-20 2003-03-12 徐万福 Helical flute and face mechanial seal composed of angular microflute group
CN201521636U (en) * 2009-08-20 2010-07-07 浙江工业大学 Gas face seal structure of three-dimensional shaped groove with bottom similar to feather texture
CN103090005A (en) * 2013-02-04 2013-05-08 北京理工大学 Spiral distributed multi-hole end face rotary sealing ring used on vehicle
CN103090006A (en) * 2013-02-04 2013-05-08 北京理工大学 Spiral groove rotary sealing ring with cone-shaped cross section and used on vehicle
CN203939991U (en) * 2014-05-29 2014-11-12 浙江工业大学 Dark link chute dynamic pressure type end surface mechanical sealing structure
CN206361151U (en) * 2016-12-12 2017-07-28 昆明理工大学 A kind of mechanical seal ring with many zigzag helicla flutes

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