CN113494607A - double-O-shaped ring C-shaped slip ring type combined sealing structure - Google Patents
double-O-shaped ring C-shaped slip ring type combined sealing structure Download PDFInfo
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- CN113494607A CN113494607A CN202110770857.1A CN202110770857A CN113494607A CN 113494607 A CN113494607 A CN 113494607A CN 202110770857 A CN202110770857 A CN 202110770857A CN 113494607 A CN113494607 A CN 113494607A
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- 238000007789 sealing Methods 0.000 title claims abstract description 202
- 239000012530 fluid Substances 0.000 claims abstract description 11
- 230000000149 penetrating effect Effects 0.000 claims abstract description 7
- 239000011148 porous material Substances 0.000 claims description 40
- 230000000694 effects Effects 0.000 abstract description 14
- 238000003825 pressing Methods 0.000 abstract description 13
- 238000005553 drilling Methods 0.000 description 13
- 239000004033 plastic Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 8
- 239000007788 liquid Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 230000003068 static effect Effects 0.000 description 6
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- 238000007906 compression Methods 0.000 description 5
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- 238000004088 simulation Methods 0.000 description 5
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000002596 correlated effect Effects 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 150000002825 nitriles Chemical class 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000005483 Hooke's law Effects 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
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- 229920001971 elastomer Polymers 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors
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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
- F16J15/46—Sealings with packing ring expanded or pressed into place by fluid pressure, e.g. inflatable packings
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Abstract
The invention discloses a double-O-shaped-ring C-shaped sliding ring type combined sealing structure which comprises a shell, wherein the shell is connected with a shaft rod through a sealing assembly, the sealing assembly comprises a sealing groove arranged in the shell, the shaft rod penetrates through the sealing groove, a sliding ring is arranged in the sealing groove, the shaft rod is arranged in the sliding ring in a penetrating manner, the sliding ring is in interference fit with the shaft rod, a plurality of sealing rings are sleeved on the outer side of the sliding ring, and the outer edges of the sealing rings are in interference fit with the groove wall of the sealing groove; the sealing structure can convert partial fluid medium pressure into pressing force, and simultaneously deform the sealing ring and fill a gap between the sealing groove and the sliding ring, so that the sealing ring can fully exert self-sealing effect, and the sealing structure is simple.
Description
Technical Field
The invention relates to the technical field of dynamic sealing structures, in particular to a double-O-shaped-ring C-shaped sliding ring type combined sealing structure.
Background
In industrial production, shaft structures of many mechanical devices not only need to reciprocate and rotate, but also are often in a liquid or gas medium filled with pressure, and compared with a traditional sealing mode, the working condition puts higher requirements on a sealing element. The O-shaped ring has good self-sealing effect due to low cost and is often applied to dynamic sealing. In order to effectively utilize the self-sealing function of the O-shaped ring under the fluid and prolong the service life of a sealing element, a sliding ring combination is often applied to the dynamic sealing working condition in modern industry. In most environments where the slip ring type combination seal is applied, the pressure and temperature of the medium are not high, and therefore, a slip ring type combination seal form is required to have a good sealing effect in high-temperature and high-pressure environments.
Disclosure of Invention
The invention aims to provide a double-O-ring C-shaped slip ring type combined sealing structure, which aims to solve the problems in the prior art, so that the sealing structure can be suitable for high-temperature and high-pressure environments and has a good sealing effect.
In order to achieve the purpose, the invention provides the following scheme: the invention provides a double-O-ring C-shaped slip ring type combined sealing structure which comprises a shell, wherein the shell is connected with a shaft rod through a sealing assembly, the sealing assembly comprises a sealing groove arranged in the shell, the shaft rod penetrates through the sealing groove, a slip ring is arranged in the sealing groove, the shaft rod penetrates through the slip ring, the slip ring is in interference fit with the shaft rod, a plurality of sealing rings are sleeved on the outer side of the slip ring, and the outer edges of the sealing rings are in interference fit with the groove wall of the sealing groove;
the sealing groove is communicated with a fine hole, a filter screen is embedded in the fine hole, and the fine hole is used for injecting fluid media with pressure into the sealing groove.
Preferably, the sealing ring is of an O-shaped sealing ring structure, and the sliding ring is of a C-shaped sliding ring structure.
Preferably, the plurality of sealing rings are sequentially arranged from top to bottom, and gaps are reserved among the plurality of sealing rings;
limiting bulges are circumferentially fixed on the outer side walls of the upper end and the lower end of the sliding ring, and the sealing ring at the uppermost end and the sealing ring at the lowermost end are abutted to the limiting bulges.
Preferably, the number of the sealing rings is two, the two sealing rings are symmetrically arranged, and the outlet ends of the fine holes face to the area between the two sealing rings.
Preferably, a gap is reserved between the limiting protrusion and the groove wall of the sealing groove.
Preferably, a mounting groove is circumferentially formed in the side wall of the inner cavity of the casing, and a sealing shell and a sealing cover are sequentially arranged in the mounting groove from top to bottom;
the sealing groove is formed in the sealing shell, the upper end and the lower end of the sealing groove are communicated with through holes, and the through holes penetrate through the upper end and the lower end of the sealing shell;
the sealing cover is provided with a through hole in a penetrating mode, the through hole and the sealing groove are located on the same straight line, and the shaft rod penetrates through the through hole, the through hole and the sealing groove.
Preferably, the pore is split type hole, the pore include first pore and with the second pore of first pore intercommunication, first pore runs through to be seted up sealed covering, the second pore is seted up sealed casing is last, the filter screen inlays to be established the entrance point in first pore, the exit end intercommunication in second pore the seal groove, just the exit end orientation in second pore the clearance between the sealing washer.
Preferably, sealing sleeves are sleeved between the shaft rod and the through hole and between the shaft rod and the through hole.
Preferably, a first screw hole penetrates through the casing, second screw holes are formed in two sides of the sealing cover, and a screw is detachably connected between the first screw hole and the second screw holes.
Preferably, the screw is perpendicular to the shaft.
The invention discloses the following technical effects: when the structure is used, a part of medium can be introduced into the sealing groove through the design of the fine holes, the pressure of the part of medium is converted into pressing force, and meanwhile, the sealing ring is deformed to fill a gap between the sealing groove and the sliding ring, so that the sealing ring can fully exert the self-sealing effect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic structural view of a double O-ring C-shaped slip ring type combined sealing structure of the present invention;
FIG. 2 is a schematic view of an upper sealing structure for a sidewall coring robot in an embodiment;
FIG. 3 is a diagram of a self-tightening sealing mechanism of an O-ring in the embodiment;
FIG. 4 is a schematic view of an embodiment of an assembly of a seal ring and a slip ring;
FIG. 5 is a divided view of the combined sealing grid of the C-shaped slip ring in the embodiment;
FIG. 6 is a cloud of contact stresses for different gaps in an example;
FIG. 7 is a line graph of maximum contact stress for different gaps in an example;
FIG. 8 is a cloud of equivalent plastic deformation for different gaps in an embodiment;
FIG. 9 is a line graph of maximum contact stress for different gaps in an example;
FIG. 10 is the contact stress distribution under different medium pressures for the embodiment with the gap of 0.6 mm;
FIG. 11 is a line graph of the maximum contact stress at different medium pressures for an example embodiment with a gap of 0.6 mm;
FIG. 12 is a cloud of the deformation of the embodiment under different medium pressures when the gap is 0.6 mm;
FIG. 13 is a line graph showing equivalent plastic deformation under different medium pressures when the gap is 0.6mm in the example;
wherein, 1 is the filter screen, 2 is the pore, 3 is the sealed lid, 4 is the screw, 5 is the sealing washer, 6 is the sliding ring, 7 is the seal groove, 8 is the casing, 9 is the axostylus axostyle, 9.1 is pushing away the heart connecting rod, 9.2 is the drilling connecting rod, 10 is spacing arch, 11 is the mounting groove, 12 is the seal shell, 13 is pushing away heart pneumatic cylinder, 14 is the perforation, 15 is the through-hole, 16 is the seal cover, 17 is the drilling pneumatic cylinder.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
In this embodiment, when the borehole wall coring robot works in a long horizontal section of a depth of 3000m, a piston rod of a pushing hydraulic cylinder is connected with a pushing arm to be supported against the borehole wall, as shown in fig. 2, a piston rod of a drilling hydraulic cylinder 17 extends out of a casing 8 through a motor and a drill connected with a drilling connecting rod 9.2 to drill, after a core is drilled, a core is pushed into a core storage barrel through a pushing hydraulic cylinder 13 through a pushing connecting rod 9.1, one side of a mechanical structure for completing coring actions is exposed in a downhole liquid, a high-pressure liquid medium of a downhole oil-liquid mixture enters the casing 8 through a gap between the connecting rod and a sealing groove 7, and the mixed liquid media are often accompanied by oil-slurry mixing, high temperature, oil-gas mixing and the like, so that the whole hydraulic system is often affected by adverse factors, and sealing structures are required in these places to minimize the influence of external factors, in order to increase the operational reliability of the sealing structure, the present embodiment designs the sealing structure for each sealing portion and performs finite element analysis.
For the above working conditions, this embodiment provides a double-O-ring C-shaped slip ring type combined sealing structure, referring to fig. 1, which includes a casing 8, the casing 8 is connected with a shaft rod 9 through a sealing assembly, the sealing assembly includes a sealing groove 7 disposed inside the casing 8, the shaft rod 9 passes through the sealing groove 7, a slip ring 6 is disposed in the sealing groove 7, the shaft rod 9 is disposed in the slip ring 6 in a penetrating manner, the slip ring 6 and the shaft rod 9 are in interference fit, the outer side of the slip ring 6 is sleeved with a plurality of sealing rings 5, and the outer edges of the sealing rings 5 are in interference fit with the groove wall of the sealing groove 7;
the sealing groove 7 is communicated with a pore 2, the filter screen 1 is embedded in the pore 2, and the pore 2 is used for injecting a fluid medium with pressure into the sealing groove 7, wherein the fluid medium is downhole liquid in the embodiment.
Specifically, the plurality of seal rings 5 are sequentially arranged from top to bottom, and gaps are left among the plurality of seal rings 5; equal circumference is fixed with spacing arch 10 on the lateral wall at both ends about sliding ring 6, be located the sealing washer 5 of top, be located sealing washer 5 of bottom all with spacing arch 10 butt, leave the clearance between the cell wall of spacing arch 10 and seal groove 7, during the in-service use, sealing washer 5 is O shape sealing washer structure, O shape circle promptly, sliding ring 6 is C shape sliding ring structure, the quantity of sealing washer 5 is two, two sealing washers 5 symmetry sets up, and pore 2's exit end is towards the region between two sealing washers 5.
When the sealing structure of the embodiment is used, the design that the fluid medium is actively introduced into the double O-shaped rings and the fine holes 2 of the sealing groove 7 is adopted, and the abrasion of the C-shaped sliding ring 6 in relative movement is compensated under the combined action of the pre-compression force of the O-shaped rings and the pressure of the medium, so that a good sealing effect is achieved.
More specifically, since the shaft 9 is assembled by interference fit, the shaft 9 presses the C-shaped slip ring 6 and the O-ring to generate an initial pressing force, and the O-ring also generates a certain amount of deformation under the initial pressing force. When fluid medium with pressure in the external environment passes through the fine holes 2 of the sealing groove 7 and then enters the sealing groove 7 to fill the gap between the O-shaped ring and the C-shaped sliding ring 6, under the combined action of medium pressure and initial pressing force, the O-shaped ring can further deform to fill the gap between the C-shaped sliding ring 6 and the sealing groove 7, and meanwhile, the force generated by the deformation of the O-shaped ring and the medium pressure can also press the C-shaped sliding ring 6 to enable the C-shaped sliding ring 6 to be tightly attached to the shaft rod 9, so that the purpose of good sealing is achieved. In this embodiment, the shaft 9 is equivalent to a push link 9.1 connected to the push cylinder 13 and a drilling link 9.2 connected to the drilling cylinder 17.
According to a further optimized scheme, a mounting groove 11 is circumferentially formed in the side wall of the inner cavity of the shell 8, and a sealing shell 12 and a sealing cover 3 are sequentially arranged in the mounting groove 11 from top to bottom;
the sealing groove 7 is formed in the sealing shell 12, the upper end and the lower end of the sealing groove 7 are communicated with through holes 14, and the through holes 14 penetrate through the upper end and the lower end of the sealing shell 12 and are used for enabling the shaft rod 9 to penetrate through the sealing shell 12;
the sealing cover 3 is provided with a through hole 15 in a penetrating mode, the through hole 15, the through hole 14 and the sealing groove 7 are located on the same straight line, the shaft rod 9 penetrates through the through hole 15, the through hole 14 and the sealing groove 7, the shaft rod 9 is used for penetrating through the sealing shell 12 and the sealing cover 3, and meanwhile the sealing cover 3 plays a role in blocking.
Further optimization scheme, pore 2 is split type hole, and pore 2 includes first pore and the second pore that communicates with first pore, and the first pore runs through to be seted up on sealed lid 3, and the second pore is seted up on sealed casing 12, and filter screen 1 inlays and establishes the entrance point in first pore, and the exit end in second pore communicates seal groove 7, and the exit end in second pore is towards the clearance between the sealing washer 5.
In a further optimized scheme, sealing sleeves 16 are sleeved between the shaft rod 9 and the through hole 14 and between the shaft rod 9 and the through hole 15, so that the flowing medium is prevented from leaking.
Further optimization scheme has run through on the casing 8 and has seted up first screw, and the second screw has been seted up to the both sides of sealed lid 3, can dismantle between first screw and the second screw and be connected with screw 4, and screw 4 perpendicular to axostylus axostyle 9, through the position of the fixed sealed lid 3 of screw 4.
In the assembly mode of the sealing structure in the embodiment, the shaft lever 9 is in interference assembly, the shaft lever 9 can press the C-shaped sliding ring 6 and the O-shaped ring to generate initial pressing force, and the O-shaped ring can also generate a certain amount of initial deformation under the action of the initial pressing force; fluid medium with pressure in the external environment enters the sealing groove 7 after passing through the sealing cover 3 and the pore 2 of the sealing groove 7 to fill the gap between the O-shaped ring and the C-shaped slip ring 6; under the combined action of medium pressure and initial pressing force, the O-shaped ring further deforms to fill a gap between the C-shaped sliding ring 6 and the sealing groove 7, and meanwhile, the force generated by the deformation of the O-shaped ring and the medium pressure also compress the C-shaped sliding ring 6, so that the C-shaped sliding ring 6 is tightly attached to the shaft rod 9; when the C-shaped slip ring 6 generates micro abrasion due to the reciprocating motion or the rotating motion of the shaft rod 9, the O-shaped ring can also compensate in the process of recovering micro deformation, so that the C-shaped slip ring 6 is always attached to the shaft rod 9.
Aiming at the working condition that the borehole wall coring robot works in the long horizontal section of 3000m deep underground under the actual working condition, the sealing mode is selected before the sealing structure is designed, and the following type selection process is provided:
the first sealing mode is selected, the sealing can be divided into two types of static sealing between relative static joint surfaces and dynamic sealing between relative motion joint surfaces, and the static sealing and the dynamic sealing are mainly divided according to purposes.
The sealing structure required by the working condition needs to be applied between a drilling connecting rod 9.2 connected with a drilling hydraulic cylinder 17 and a pushing connecting rod 9.1 connected with a pushing hydraulic cylinder 13, and belongs to the application of a dynamic sealing structure. The dynamic seal can be divided into two basic types of rotary seal and reciprocating seal, the drilling connecting rod 9.2 and the pushing connecting rod 9.1 are in reciprocating motion in the motion process, the motion speed is slow, and the working environment is in high temperature and high pressure, so the requirement on the sealing effect is high. How to choose a safe and reliable sealing mode with good sealing performance is a key problem, and because the radial size of the coring robot is small, the stress of the sealing mode is required to be long in service life, compact in structure and low in cost, so that the coring robot is not only beneficial to maintenance and replacement, but also beneficial to saving space. According to the actual working condition of the coring robot, most of the sealing parts required by the coring robot have relative motion, and the rest part of the sealing parts is in a static contact structure, so that a better sealing mode is selected for the relative motion, and the following table (1) provides excellent comparison conditions of several sealing types:
table (1);
from the comprehensive consideration of basic requirements on sealing and the comparison of the superiority of several sealing types, because the O-shaped ring can play a good sealing effect whether being a static seal or a dynamic seal, the O-shaped ring is selected as a sealing mode at the drilling connecting rod 9.2 and the pushing connecting rod 9.1. The sealing structure is simple, the inner space of the coring robot can be effectively saved, and various dimensions of the O-shaped ring are standardized, so that the O-shaped ring is convenient to purchase and replace. During the drilling and coring process, the movement speed of the drilling connecting rod 9.2 and the core pushing connecting rod 9.1 is relatively slow, and the resistance generated during the movement by sealing with the O-shaped ring is small.
The self-tightening sealing mechanism of the O-shaped ring is shown in figure 3, and is compared with a flat gasket, as can be seen from figure 3, when the internal pressure of a fluid medium is increased, the medium leakage condition is shown in figure a, and because the O-shaped ring is an arc surface, the O-shaped ring can be irregularly deformed due to uneven stress and can deviate towards the internal pressure direction of the medium, as shown in figures b and c, when the internal pressure of the external medium is increased within a certain range, the larger the deformation generated by the O-shaped ring is, the better the sealing performance is, the static pressure of 400MPa can be sealed without leakage, and in order to realize the self-sealing effect, a certain pressing force must be applied during assembly, so that the O-shaped ring generates certain pre-deformation.
Because the external environment of the hydraulic system is relatively severe, in order to effectively utilize the self-sealing effect of the O-shaped ring and improve the service life of the O-shaped ring, a sliding ring type combined sealing form is selected, wherein the C-shaped sliding ring 6 is placed between the friction pairs according to the using principle of the C-shaped sliding ring 6, the O-shaped ring is placed in the groove of the C-shaped sliding ring 6, a pressing force is applied to compress the O-shaped ring during assembly, the C-shaped sliding ring 6 is tightly attached to the friction pairs by utilizing the elastic force generated by the deformation of the O-shaped ring, and the leakage is prevented.
Since the C-shaped slip ring 6 is made of composite material, a certain amount of wear occurs during long-term relative movement of the friction pair with respect to the sealed material, and a small gap due to the wear is also compensated by the compressed O-ring in the process of recovering the small deformation. And the groove (i.e. the limit protrusion 10) of the C-shaped sliding ring 6 also ensures that the O-ring cannot be extruded. Therefore, the structure has the advantages of long service life, low friction, no leakage, strong applicability, capability of being used as bidirectional pressure seal and the like. The specific structure is shown in fig. 4.
Regarding the selection aspect of materials, because the sealing structure in the embodiment is used for dynamic sealing, relative rotation does not exist between the friction pairs, the temperature of an external fluid medium can reach 100 ℃ at most, the pressure of a downhole liquid medium is 60MPa at most, the whole borehole wall coring robot does not work continuously but completes each coring operation intermittently, and nitrile butadiene is selected as an O-shaped ring material after comprehensive consideration.
The following conditions should be provided for the selection of the material for the C-shaped slip ring 6:
1. the lubricating property number of the surface of the friction pair can effectively protect the surface of the friction pair;
2. the shearing strength is low, so that the friction factor of the friction pair can be reduced;
3. the stability is good, and no corrosion or other harmful effects are generated;
4. higher load bearing capacity than lubricating grease film.
The C-shaped slip ring 6 is made of polytetrafluoroethylene
In the present embodiment, the results of the sealing structure are shown in Table (2)
Table (2);
finite element analysis was performed on the seal structure in this example as follows:
the method comprises the steps of dividing a slip ring combined sealing shape by using a grid, processing by adopting a Lagrange increment method and a Gaussian measuring point method, and using a complex boundary condition of a 2D axisymmetric arrangement model for simplifying calculation simulation, which is shown in figure 5.
When the installation sliding ring seal is combined, because the diameter of connecting rod is different, cause to compress tightly the O shape circle when interference fit, let the O shape circle form initial contact stress between sliding ring 6, seal groove 7, consequently exert the clearance between displacement control connecting rod and seal groove 7 in the radial and be indispensable. When the gaps are adjusted to 0.2mm, 0.4mm, 0.6mm and 0.8mm in sequence, the maximum von mises change cloud charts of the slip ring seal combination are shown in fig. 6-7.
In order to adjust to a proper pressing force, finite element analysis carried out by different clearance values shows that the contact stress generated between the C-shaped slip ring 6 and the O-shaped ring is continuously reduced along with the increase of the clearance, the C-shaped slip ring 6 is not blocked by the sealing groove 7 after being extruded by the O-shaped ring, the maximum contact stress appears on the right fillet of the C-shaped slip ring 6, the C-shaped slip ring 6 and the O-shaped ring are easy to deform seriously due to too large contact stress, and the leakage is caused due to too small contact stress, so that the comprehensive consideration of the required sealing effect is very critical, and equivalent plastic deformation cloud charts with different clearance values are shown in fig. 8-9.
As can be seen from the figure, as the gap value decreases, the maximum equivalent plastic deformation gradually increases, the maximum equivalent plastic deformation occurs inside the O-ring, and the O-ring fits the C-shaped slip ring 6 more flatly. After calculation, the friction between the connecting rod and the sliding ring 6 is increased when the clearance value is 0.2mm, the abrasion is accelerated, the fatigue failure is easy to occur, and the sliding ring 6 is damaged when the external medium pressure is more than 50MPa, so that the clearance value is selected to be more than 0.2mm to control the pressing force for sealing. We chose a gap of 0.6mm to apply compression to the connecting rod. After the connecting rod is compacted, the sealing performance of the sealing structure under different medium pressures needs to be considered, so that medium pressures with different sizes need to be applied to the places contacting with the medium pressures, and the maximum contact stress and the maximum equivalent plastic deformation are analyzed through finite element simulation results. Referring to FIGS. 10-11, the maximum stress cloud plots for a gap value of 0.6mm at respective applied media pressures of 20MPa, 40MPa, 60MPa, and 80 MPa.
It can be seen from the figure that when the gap value is chosen to be 0.6mm, the maximum contact stress occurs in the left part of the sealing groove 7, and the O-ring is subjected to a smaller contact stress than the sealing groove 7 and the C-shaped slip ring 6. The left O-ring is subjected to only one side of the medium pressure, so the lower left corner deforms more than the right O-ring. The maximum contact stress is increased along with the increase of the medium pressure, the maximum contact stress does not exceed the allowable stress of the material, the whole stress of the C-shaped slip ring 6 is relatively uniform, and the phenomenon of stress concentration does not occur. The C-shaped slip ring 6 is better attached to the connecting rod under the medium pressure.
As shown in fig. 12-13, as the pressure of the medium increases, the maximum equivalent plastic deformation of the O-ring also increases, and the maximum equivalent plastic deformation occurs below the contact of the left O-ring and the C-shaped slip ring 6. The extruded and deformed O-shaped ring is deformed to fully contact the sliding ring 6 and the sealing groove 7, and the contact length of the O-shaped ring fills the gap to achieve a good sealing effect. According to the data, the underground pressure is about 60MPa when the horizontal deep well is 3000m, the maximum contact stress is 168MPa at the moment and appears on the sealing groove 7 through finite element simulation, but the allowable stress of the material is not exceeded, and the maximum equivalent plastic deformation of the O-shaped ring is 1.08 mm. When the nitrile rubber has a compression ratio of 25% at 100 ℃ for 70 hours, only a small compression set is obtained. When the nitrile butadiene composite rubber with the structure is sealed underground, the single coring time is about 5min, so the total working time is about 5 hours, and the maximum equivalent plastic deformation is 1.08mm and is less than 25% of compression ratio, so the O-shaped ring is in a recoverable deformation range and is safe. Therefore, the sealing combination of the C-shaped slip ring has good sealing performance and can deal with the underground high-temperature and high-pressure working environment.
The embodiment is mainly designed aiming at the sealing mode of the connection external connecting rod part of the coring key part, namely the drilling hydraulic cylinder 17 and the core pushing hydraulic cylinder 13, provides a mode of combined sealing by using two O-shaped rings and one C-shaped sliding ring 6 aiming at the high-temperature and high-pressure working environment, and simulates the underground working environment to complete finite element analysis of a sealing element, thereby verifying that the combined sealing mode has good sealing effect and can meet the requirements of underground working. According to simulation results, the shapes of the line graphs of the maximum contact stress of different gaps, the maximum equivalent plastic deformation of different gaps, the maximum contact stress under different medium pressures and the equivalent plastic deformation under different medium pressures are linear, are linearly and negatively correlated with the contact stress, are linearly and positively correlated with the equivalent deformation, and meet the generalized Hooke's law. The pressing force is within the allowable stress range of the O-shaped ring, and the simulation result can meet the requirement.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (10)
1. The utility model provides a two O shape circle C shape slip ring formula combined seal structure, includes casing (8), casing (8) are connected with axostylus axostyle (9) through seal assembly, its characterized in that: the sealing assembly comprises a sealing groove (7) arranged in the shell (8), the shaft rod (9) penetrates through the sealing groove (7), a sliding ring (6) is arranged in the sealing groove (7), the shaft rod (9) penetrates through the sliding ring (6), the sliding ring (6) is in interference fit with the shaft rod (9), a plurality of sealing rings (5) are sleeved on the outer side of the sliding ring (6), and the outer edges of the sealing rings (5) are in interference fit with the groove wall of the sealing groove (7);
seal groove (7) intercommunication has pore (2), pore (2) are embedded to be equipped with filter screen (1), pore (2) are used for to the fluid medium that has pressure is injected into in seal groove (7).
2. The double O-ring C-shaped slip ring type unitized seal structure of claim 1, wherein: the sealing ring (5) is of an O-shaped sealing ring structure, and the sliding ring (6) is of a C-shaped sliding ring structure.
3. The double O-ring C-shaped slip ring type unitized seal structure of claim 1, wherein: the sealing rings (5) are sequentially arranged from top to bottom, and gaps are reserved among the sealing rings (5);
limiting bulges (10) are circumferentially fixed on the outer side walls of the upper end and the lower end of the sliding ring (6), and the sealing ring (5) located at the uppermost end and the sealing ring (5) located at the lowermost end are abutted to the limiting bulges (10).
4. The double O-ring C-shaped slip ring type unitized seal structure of claim 3, wherein: the quantity of sealing washer (5) is two, two sealing washer (5) symmetry sets up, just the exit end orientation of pore (2) is two regional between sealing washer (5).
5. The double O-ring C-shaped slip ring type unitized seal structure of claim 3, wherein: and a gap is reserved between the limiting bulge (10) and the groove wall of the sealing groove (7).
6. The double O-ring C-shaped slip ring type unitized seal structure of claim 1, wherein: a mounting groove (11) is formed in the circumferential direction of the side wall of the inner cavity of the shell (8), and a sealing shell (12) and a sealing cover (3) are sequentially arranged in the mounting groove (11) from top to bottom;
the sealing groove (7) is formed in the sealing shell (12), the upper end and the lower end of the sealing groove (7) are communicated with through holes (14), and the through holes (14) penetrate through the upper end and the lower end of the sealing shell (12);
the sealing cover (3) is provided with a through hole (15) in a penetrating mode, the through hole (15), the through hole (14) and the sealing groove (7) are located on the same straight line, and the shaft rod (9) penetrates through the through hole (15), the through hole (14) and the sealing groove (7).
7. The double O-ring C-shaped slip ring type unitized seal structure of claim 6, wherein: pore (2) are split type hole, pore (2) include first pore and with the second pore of first pore intercommunication, first pore runs through to be seted up on sealed lid (3), the second pore is seted up on sealed casing (12), filter screen (1) are inlayed and are established the entrance point in first pore, the exit end intercommunication in second pore seal groove (7), just the exit end orientation in second pore the clearance between sealing washer (5).
8. The double O-ring C-shaped slip ring type unitized seal structure of claim 6, wherein: sealing sleeves (16) are sleeved between the shaft rod (9) and the through hole (14) and between the shaft rod (9) and the through hole (15).
9. The double O-ring C-shaped slip ring type unitized seal structure of claim 6, wherein: the shell (8) is provided with a first screw hole in a penetrating mode, the two sides of the sealing cover (3) are provided with second screw holes, and a screw (4) is detachably connected between the first screw hole and the second screw holes.
10. The double O-ring C-shaped slip ring type unitized seal structure of claim 9, wherein: the screw (4) is perpendicular to the shaft (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110770857.1A CN113494607A (en) | 2021-07-08 | 2021-07-08 | double-O-shaped ring C-shaped slip ring type combined sealing structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110770857.1A CN113494607A (en) | 2021-07-08 | 2021-07-08 | double-O-shaped ring C-shaped slip ring type combined sealing structure |
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| WO2006040865A1 (en) * | 2004-10-08 | 2006-04-20 | Nippon Pillar Packing Co., Ltd. | Static pressure type non-contact gas seal |
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| CN204628558U (en) * | 2015-04-13 | 2015-09-09 | 泰州市建业车件制造有限公司 | A kind of concrete mixer shaft end seal structure |
| CN105378398A (en) * | 2013-04-29 | 2016-03-02 | 开利公司 | Low leakage seal for low pressure system |
| CN107061749A (en) * | 2017-03-20 | 2017-08-18 | 北京化工大学 | Sealing body, shaft sealer and control method |
| CN107208618A (en) * | 2015-01-30 | 2017-09-26 | V·拉比 | fluid cushion sealing device |
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2021
- 2021-07-08 CN CN202110770857.1A patent/CN113494607A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006040865A1 (en) * | 2004-10-08 | 2006-04-20 | Nippon Pillar Packing Co., Ltd. | Static pressure type non-contact gas seal |
| CN1904416A (en) * | 2005-07-25 | 2007-01-31 | 周承惠 | Inner cavity medium pressure self compensated composite sealing ring |
| CN105378398A (en) * | 2013-04-29 | 2016-03-02 | 开利公司 | Low leakage seal for low pressure system |
| CN107208618A (en) * | 2015-01-30 | 2017-09-26 | V·拉比 | fluid cushion sealing device |
| CN204628558U (en) * | 2015-04-13 | 2015-09-09 | 泰州市建业车件制造有限公司 | A kind of concrete mixer shaft end seal structure |
| CN107061749A (en) * | 2017-03-20 | 2017-08-18 | 北京化工大学 | Sealing body, shaft sealer and control method |
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Application publication date: 20211012 |
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