CN105202194A - Sealing ring and mechanical sealing device with same - Google Patents
Sealing ring and mechanical sealing device with same Download PDFInfo
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- CN105202194A CN105202194A CN201510636716.5A CN201510636716A CN105202194A CN 105202194 A CN105202194 A CN 105202194A CN 201510636716 A CN201510636716 A CN 201510636716A CN 105202194 A CN105202194 A CN 105202194A
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Abstract
The invention provides a sealing ring which is characterized in that the sealing end face of the sealing ring is provided with a shallow groove, and the bottom face of the shallow groove is a curved face, wherein the curved face is obtained after elastic recovery of a smooth and continuous curved face, the smooth and continuous curved face is formed in the mode that a circle moves on the sealing ring which has generated elastic deformation making the sealing end face be deformed into a non plane according to a law of motion. The invention further provides a mechanical sealing device with the sealing ring, and the mechanical sealing device is applicable to various types of mechanical sealing. Compared with an existing sealing ring with the sealing end face provided with a flat bottom and other deep grooves and shallow grooves, the thickness or rigidity of a fluid film is larger under the same condition, stability and reliability are higher, and the service life is longer. Compared with an existing sealing ring of a shallow groove with the groove bottom being an inclined plane, or the groove bottom being multi-level flat bottom steps or multi-level inclined bottom steps, the face shape of the bottom face of the shallow groove is consistent with the grinding machining surface generation principle, machining accuracy is high, and the cost is low.
Description
Technical field
The invention belongs to the seal ring field of mechanical seal, relate to a kind of seal ring being provided with shallow slot at seal face, be provided with at seal face the seal ring that bottom land is the shallow slot of curved surface in particular to a kind of, also relate to a kind of mechanical seal device with sealing ring, be applicable to various forms of contacting mechanical seal and non-contact mechanical seal.
Background technique
Mechanical seal is widely used in the transmission such as pump, compressor, reactor, stirrer, centrifuge and filter or processes the rotating equipment of various fluid.In mechanical seal, rotary packing ring (also known as rotating ring) rotates with axle, and fits tightly composition primary seal with stationary seal ring (also known as stationary ring), leaks to prevent sealing medium.The usability of mechanical seal depends primarily on the Frotteurism between the seal face of two seal rings, and key wear part also occurs in seal face, and therefore rotating ring and stationary ring are the core components of mechanical seal.Mechanical seal is generally divided into contacting mechanical seal and non-contact mechanical seal two kinds.In contacting mechanical seal, the seal face of two seal rings of mutually laminating is generally designed and manufactures smooth as far as possible, so that gap is little as far as possible thus reduce to reveal when making two seal faces fit tightly.But contacting mechanical seal mainly works under mixed friction and boundary friction state, two seal faces are generally in contact condition, and wearing and tearing, power consumption and heating value are all larger, and the life-span is shorter, use and be restricted under high speed, high pressure.
By offering at seal ring planar end surface the lubrication that shallow slot can strengthen seal face, reducing the friction and wear on end face, reducing frictional heat, improve stability and the life-span of sealing.The mechanical seal of at present offering shallow slot at end face has developed into a kind of typical non-contact mechanical seal.This non-contact mechanical seal is that to offer a series of degree of depth be micron-sized shallow slot to the planar end surface of a seal ring wherein, as spiral chute, arc groove, leaf groove, T-slot, Y shape groove, L shape groove, straight trough and various special-shaped slots etc., in the running, due to the dynamic pressure effect of shallow slot, the fluid-encapsulated pressure entering this groove is raised, this pressure acts on dynamic and static ring seal face bonded to each other, these two faces are pushed open and does not contact, and between form continuous, stable fluid-encapsulated film, realize non-contact seals.
Shallow slot is generally offered on the seal face of the hard seal rings such as Tungsten carbite, silicon carbide, silicon nitride, highi degree of accuracy processing is more difficult, but the thickness of its geometrical shape convection cell film, rigidity, bearing capacity and stability influence are comparatively large, good shallow slot geometry design and highi degree of accuracy processing are the core technologies of mechanical seal.
The known seal ring being provided with shallow slot at seal face, goes back Shortcomings.
Such as, common flat grade deep spiral groove, arc groove, leaf groove, T-slot, Y shape groove, L shape groove and various special-shaped slot, because groove depth is equal, not strong to fluid-encapsulated compression, hydrodynamic effect is not strong, so under certain operating mode, fluid film thickness is not enough, or the insufficient rigidity of fluid film, causes the instability of sealability under certain fluid film thickness.
The dynamic pressure effect of end face fluid is strengthened by offering dark shallow slot such as non-grade at the seal face of seal ring, and then increase bearing capacity and the thin rigidity of fluid film of end face fluid film, thus lift-off seal operation stability and reliability increase the service life, be one of main development direction of mechanical seal.
Such as, the Chinese patent literature of publication number CN1415877A discloses a kind of Unit for sealing end surface of 3 D helical flute with double helix angles, and the groove depth of the spiral shallow slot that the seal face of its seal ring is offered measures low pressure survey from high pressure and shoals gradually; The Chinese patent literature of publication number CN101985981A discloses the skew lines groove mechanical seal ring that a kind of bottom land is tapered plane; The american documentation literature of publication number US5722665A discloses a kind of dynamic pressure groove be made up of the flat step of two-stage or wedged bottom step; The Chinese patent literature of publication number CN102927282A discloses the Spiral Groove Mechanical Seal end face of the multistage flat step formation that a kind of radially order deepens; The Chinese patent literature of publication number CN101469771A disclose a kind of can the step circular arc slot mechanical of bidirectional rotation.These non-depth curve grooves generally have fine structure and precision is high, the feature that roughness requirements is strict, workability is generally poor, what have very difficultly processes, what have even cannot directly process, now many employing high energy laser beam layering processing is similar to shaping, Shortcomings in machining accuracy and surface roughness etc.
Summary of the invention
In order to solve problems of the prior art, the invention provides and a kind ofly be provided with at seal face the seal ring that groove bottom is the shallow slot of curved surface, additionally providing a kind of mechanical seal device with sealing ring.
A circumference has five degrees of freedom in three dimensions, can by mathematical method, selects five inependent modes to set up system of coordinates and equation to describe the pose of this circumference and position and motion thereof.And instantaneous pose and position can be described by straight line motion or rotation or the compound motion be made up of them.When with suitable pose along straight line or curvilinear motion time, its movement locus is curved surface at three dimensional space, also can be positive gauss curvature surface or zero Gaussian curvature curved surface.Obviously, if this circumference seal face flat with seal ring when moving is crossing, seal ring can be formed the smooth continuous curve surface deepened continuously, therefore can define the bottom surface of shallow slot with such curved surface.When defining the bottom surface of shallow slot with such positive gauss curvature surface, if cut off shallow slot by a series of plane crossing seal ring axis can obtain a series of cross section, there is an interval, in this is interval, the area in each cross section reduces clockwise or counterclockwise gradually, and therefore this curved surface can be used to the bottom surface defining shallow slot.
And then, if make seal ring produce the seal face making it flat be in advance deformed into nonplanar resiliently deformable, when this circumference moves by the characteristics of motion on the seal ring producing resiliently deformable, the seal ring be out of shape can form above-mentioned smooth continuous curve surface.To certain distortion be there is in this smooth continuous curve surface after seal ring elastic recovery, this distortion can not change the smooth continuity of this curved surface, also can not change Gaussian curvature is this positive character, the surf deform that can also be even zero by original Gaussian curvature by this distortion is Gaussian curvature is positive curved surface, therefore can define the bottom surface of shallow slot with the curved surface that this has been out of shape, the degree of depth of the bottom surface of the shallow slot of obviously definition is like this continually varying.When taking Gaussian curvature as positive curved surface to define the bottom surface of shallow slot, if cut off shallow slot by a series of plane crossing seal ring axis can obtain a series of cross section, there is an interval, in this is interval, the area in each cross section reduces clockwise or counterclockwise gradually, and therefore this curved surface can be used to the bottom surface defining shallow slot.
The process forming surface when mechanical manufacturing field utilizes cutter to carry out cutting is exactly that the blade controlling cutter moves the process of material unnecessary on workpiece removal along certain track.During the cup emery wheel grinding adopting end face width narrower, from the angle of grinding shaping surface, cup emery wheel is equivalent to the circumference that has cutting function, if radius of a circle used when grinding wheel radius used and design shallow slot is equal, the characteristics of motion used when cup emery wheel designs with shallow slot relative to the building motion that workpiece does is consistent, surperficial formation basic theory error is not just had during grinding, can Accurate Shaping, realize highi degree of accuracy processing.Therefore from the angle of processing, on the seal ring becoming nonplanar resiliently deformable making flat seal face, highi degree of accuracy processes the shallow slot that the smooth continuous curve surface that formed by movement locus when three dimensional space moves by the characteristics of motion with a circumference is bottom surface is feasible.
And then apply power or thermal force to the seal ring with flat seal face, flat seal face can be made to produce resiliently deformable, and be deformed into non-planar surface, obvious this distortion is reversible, and after load is removed, the distortion produced can disappear completely.If carry out grinding to seal ring in this case, so can process smooth continuous curve surface on the seal ring be out of shape, it is positive smooth surface that this smooth continuous curve surface can be deformed into a Gaussian curvature after seal ring elastic recovery, therefore, from the angle of processing, on the seal ring creating resiliently deformable, highi degree of accuracy processes the shallow slot that the curved surface that the smooth continuous curve surface that formed by movement locus when three dimensional space moves by the characteristics of motion with a circumference obtains after elastic recovery is again bottom surface is feasible.
Straight line motion and rotate be the most simply, two kinds of basic exercises the most easily realizing, lathe generally adopts single straight line motion, single rotation or adopts and is combined into the complicated multi-shaft interlocked relative movement realizing cutter and workpiece by multiple basic exercise.The travel axis normally level or vertically arranged of lathe, the moving direction of such as linear motion axis is generally level or vertical, and the axis of rotatingshaft is generally level or vertical.Research finds, when the circumference favouring seal face does single rotation around seal ring axis, the curved surface of formation is turning surface; When a circumference around the straight line being parallel to seal face be axis do single rotation time, the curved surface of generation is edge-on; When a circumference does the single straight line motion perpendicular to seal face, the curved surface of generation is also edge-on; When the circumference favouring seal face does the single straight line motion being parallel to seal face, can generate Gaussian curvature is positive curved surface; When seal ring does relative to the circumference tilted to rotate for axis with the straight line of seal ring axis being parallel, also can generate Gaussian curvature is positive curved surface.Therefore be positive curved surface when a circumference can generate Gaussian curvature when three dimensional space does single basic exercise.Obviously, angle no matter from mathematics or the angle from machining, can increase a straight line motion further or increase by one that to rotate thus form the compound motion be made up of two basic exercises be positive curved surface to generate Gaussian curvature on above-mentioned single straight line motion or single rotation basis.
Further research finds: although, the curved surface formed when seal ring does single rotation relative to the circumference tilted around seal ring axis is turning surface, but, if meanwhile, seal ring also does a straight line motion along seal ring axial direction relative to the circumference tilted, and can generate Gaussian curvature on seal ring is positive curved surface; Or meanwhile, seal ring also does relative to the circumference tilted the straight line motion that is parallel to seal face, and also can generate Gaussian curvature on seal ring is positive curved surface.
Further research also finds: although, when a circumference around the straight line being parallel to seal face be axis do single rotation time the curved surface that generates be edge-on, but, if meanwhile, seal ring also rotates around the axis of seal ring, and also can generate Gaussian curvature on seal ring is positive curved surface; Or meanwhile, seal ring also does the straight line motion that is parallel to seal face, also can generate Gaussian curvature on seal ring is positive curved surface; Or meanwhile, seal ring also does a rotation being axis with the parallel lines of seal ring axis, also can generate Gaussian curvature on seal ring is positive curved surface.
Further research also finds: although, when a circumference around the straight line being parallel to seal face be axis do single rotation time the curved surface that generates be edge-on, but, if meanwhile, seal ring also rotates around the axis of seal ring, and also can generate Gaussian curvature on seal ring is positive curved surface; Or meanwhile, seal ring also does the straight line motion that is parallel to seal face, also can generate Gaussian curvature on seal ring is positive curved surface; Or meanwhile, seal ring also does a rotation being axis with the parallel lines of seal ring axis, also can generate Gaussian curvature on seal ring is positive curved surface.
Obviously, angle no matter from mathematics or the angle from machining, on the compound motion basis be made up of two basic exercises, a straight line motion can be increased further or rotate and form more complicated compound motion, the compound motion be namely made up of three basic exercises.And then, on the compound motion basis be made up of three basic exercises, more one or more basic exercise can also be increased form more complicated compound motion, the compound motion that the compound motion be namely made up of four basic exercises or more basic exercises are formed.
In addition, considering from being convenient to realize angle, can be simplified compound motion, being coupled into by the basic exercise of two in compound motion the simple motion performed by a guide mechanism, to reduce the quantity of travel axis and to reduce the complexity of machine tool motion.Such as, the straight line motion and the straight line motion perpendicular to seal face that one are parallel to seal face are coupled as a straight line motion tilted with seal face, the straight line motion such as two being parallel to seal face is coupled as a plane curve movement, such as, be that rotation and the straight line motion perpendicular to seal face of axle is coupled as a spiral motion by the parallel lines around seal ring axis.
The present invention adopts following technological scheme to realize:
First aspect of the present invention provides a kind of seal ring.Sealing ring has flat seal face, seal face is provided with shallow slot, and the bottom surface of described shallow slot is the curved surface that the smooth continuous curve surface formed when creating and the seal ring making seal face be deformed into nonplanar resiliently deformable moving by the characteristics of motion by a circumference obtains after elastic recovery again.
Described resiliently deformable is the resiliently deformable produced seal ring applying power or thermal force.
The described characteristics of motion is that the circumference favouring seal face does the straight line motion being parallel to seal face,
Or seal ring is relative to the circumference the tilted rotation that to do with the straight line with seal ring axis being parallel be axis,
Or the circumference favouring seal face does the straight line motion slightly tilted with seal face,
Or the circumference the favouring seal face spiral motion that to do with the parallel lines of seal ring axis be axis,
Or the circumference favouring seal face does the straight line motion that slightly tilts with seal face by one and a compound motion formed around the rotation of seal ring axis,
Or the circumference favouring seal face does the compound motion that the straight line motion that slightly tilts with seal face and a straight line motion perpendicular to seal face form,
Or the circumference favouring seal face does by one with the parallel lines of seal ring axis be axis spiral motion and a compound motion formed around the rotation of seal ring axis,
Or the circumference favouring seal face does by one with the parallel lines of seal ring axis be axis spiral motion and a compound motion formed perpendicular to the straight line motion of seal face,
Or the circumference favouring seal face does by a straight line motion perpendicular to seal face and a compound motion formed around the rotation of seal ring axis,
Or by one to be parallel to the rotation and a compound motion formed around the rotation of seal ring axis that the straight line of seal face is axis,
Or the circumference favouring seal face does by one with the parallel lines of seal ring axis be axis rotation and a compound motion formed around the rotation of seal ring axis,
Or by a straight line motion perpendicular to seal face, one to be parallel to the rotation and a compound motion formed around the rotation of seal ring axis that the straight line of seal face is axis,
Or the circumference favouring seal face do by a straight line motion perpendicular to seal face, one with the parallel lines of seal ring axis be axis rotation and a compound motion formed around the rotation of seal ring axis,
Or the circumference favouring seal face do by a straight line motion perpendicular to seal face, one with the parallel lines of seal ring axis be axis spiral motion and a compound motion formed around the rotation of seal ring axis,
Or the circumference favouring seal face does by a straight line motion perpendicular to seal face, a compound motion formed with the spiral motion that is axis of the parallel lines of seal ring axis and a straight line motion being parallel to seal face,
Or the circumference favouring seal face does by a straight line motion perpendicular to seal face, a compound motion formed with the spiral motion that is axis of the parallel lines of seal ring axis and a straight line motion slightly tilted with seal face,
Or the circumference favouring seal face do by a straight line motion being parallel to seal face, one to be parallel to the rotation and a compound motion formed around the rotation of seal ring axis that the straight line of seal face is axis,
Or the circumference favouring seal face do by a straight line motion slightly tilted with seal face, one to be parallel to the rotation and a compound motion formed around the rotation of seal ring axis that the straight line of seal face is axis,
Or the circumference favouring seal face do by the spiral motion that is axis with the parallel lines of seal ring axis, one to be parallel to the rotation and a compound motion formed around the rotation of seal ring axis that the straight line of seal face is axis,
Or the circumference favouring seal face does by a straight line motion perpendicular to seal face, straight line motion and a compound motion formed around the rotation of seal ring axis being parallel to seal face,
Or the circumference favouring seal face does by a straight line motion perpendicular to seal face, a straight line motion slightly tilted with seal face and a compound motion formed around the rotation of seal ring axis,
Or the circumference favouring seal face does the compound motion be made up of a straight line motion perpendicular to seal face, a straight line motion slightly tilted with seal face and a straight line motion being parallel to seal face,
Or the circumference favouring seal face does the straight line motion that slightly tilts with seal face by two and a compound motion formed perpendicular to the straight line motion of seal face,
Or the circumference favouring seal face does the straight line motion and the compound motion formed perpendicular to the straight line motion of seal face that are parallel to seal face by two,
Or by two straight line motions being parallel to seal face, one to be parallel to the rotation and a compound motion formed around the rotation of seal ring axis that the straight line of seal face is axis,
Or the circumference favouring seal face does and is parallel to the straight line motion of seal face, a straight line motion perpendicular to seal face and a compound motion formed around the rotation of seal ring axis by two,
Or the circumference favouring seal face do by a straight line motion slightly tilted with seal face, one be parallel to the straight line motion of seal face, a straight line motion perpendicular to seal face and a compound motion formed around the rotation of seal ring axis
Or the circumference favouring seal face do by the spiral motion that is axis with the parallel lines of seal ring axis, one be parallel to the straight line motion of seal face, a straight line motion perpendicular to seal face and a compound motion formed around the rotation of seal ring axis
Or by one be parallel to seal face the rotation of straight line for axis, one be parallel to the straight line motion of seal face, a straight line motion perpendicular to seal face and a compound motion formed around the rotation of seal ring axis.
In described shallow slot bottom surface, the Gaussian curvature of each point is just.
If cut off described shallow slot by a series of plane crossing seal ring axis can obtain a series of cross section, so there is an interval, in this is interval, the area in each cross section reduces clockwise or counterclockwise gradually.
Described shallow slot is opened on the inner periphery of seal face, or is opened on the outer periphery of seal face, or does not all have opening in the outer periphery of seal face and inner periphery.
Described shallow slot has the shape shoaled gradually from internal side diameter to outside diameter, or has the shape shoaled gradually from outside diameter to internal side diameter, or has and deepen to outside diameter the shape then shoaled gradually from internal side diameter gradually.
Described shallow slot also comprises the sidewall risen steeply.
Described shallow slot has the shape circumferentially deepening gradually and then shoal gradually, or has the shape circumferentially deepened gradually.
Described shallow slot is symmetrical about the radial line of seal ring, or obviously asymmetric.
Described shallow slot is in the projection roughly helically shape of seal face.
Seal face also can be provided with the shallow slot of the smooth continuous curve surface formed when groove bottom is and is moved by the characteristics of motion on undeformed seal ring by a circumference to strengthen dynamic pressure effect.
The scope of the radius of described circumference is 10 ~ 500 millimeters, and the scope of the degree of depth of described curved surface lowest part is 0.5 ~ 200 micron, and the scope of the quantity of described shallow slot is 2 ~ 200.
Described seal face is provided with one group of shallow slot that is identical, that along the circumferential direction regularly distribute, or comprises some groups of different shallow slots, often organizes and is along the circumferential direction uniformly distributed.
Seal face can also be provided with the chute of the conventional structure forms such as T-slot, arc groove, spiral chute, rectangle groove to strengthen dynamic pressure effect, or also be provided with annular groove to suppress leakage, or also be provided with guiding gutter to strengthen fluid-encapsulated flowing.
Second aspect of the present invention there is provided a kind of mechanical seal device with seal ring of the present invention.This mechanical seal device comprises cavity, and cavity is fixed with stationary ring, and stationary ring is with seal face, stationary ring cover on the rotating shaft, rotatingshaft is fixed with rotating ring, and also with seal face on rotating ring, stationary ring is near the seal face of rotating ring, during work, two seal faces are close to laminating, have sealing medium in gap, and rotatingshaft drives rotating ring to rotate relative to stationary ring, sealing medium is by the clearance leakage between two seal faces, and described rotating ring or stationary ring are seal ring of the present invention.
Beneficial effect of the present invention is mainly manifested in: the bottom surface of the shallow slot that the seal face of seal ring of the present invention is offered is curved surface, its degree of depth consecutive variations, thus operationally there is stronger convergence property, compared with the seal ring being provided with flat depth curve groove with existing seal face, thickness or the rigidity of the fluid film formed at identical conditions are larger, stability and by property higher, the life-span is longer; Be tapered plane with existing bottom land, bottom land is compared with the shallow slot of multistage flat step or multistage wedged bottom step, the face shape of the bottom surface of shallow slot of the present invention can regard as the narrower cup emery wheel of the end face width that is rotating by certain movement rule at three-dimensional movement locus generate curved surface and obtain through resiliently deformable again, meet grinding Surface generation principle, machining accuracy is high, and cost is low.
Accompanying drawing explanation
Fig. 1 is in a kind of seal ring of providing of the present invention, a kind of typical shallow slot schematic shapes.
Fig. 2 is the plan view of shape shown in Fig. 1.
Fig. 3 is that shallow slot shown in Fig. 1 forms schematic diagram.
Fig. 4 is the plan view of Fig. 3.
Fig. 5 is the partial enlarged drawing of Fig. 3.
Fig. 6 is in a kind of seal ring of providing of the present invention, another kind of typical shallow slot schematic shapes.
Fig. 7 is the plan view of shape shown in Fig. 6.
Fig. 8 is that shallow slot shown in Fig. 6 forms schematic diagram.
Fig. 9 is the plan view of Fig. 8.
Figure 10 is in a kind of seal ring of providing of the present invention, another kind of typical shallow slot schematic shapes.
Figure 11 is the plan view of shape shown in Figure 10.
Figure 12 is in a kind of seal ring of providing of the present invention, another kind of typical shallow slot schematic shapes.
Figure 13 is the plan view of shape shown in Figure 12.
Figure 14 is in a kind of seal ring of providing of the present invention, another kind of typical shallow slot schematic shapes.
Figure 15 is the plan view of shape shown in Figure 14.
Figure 16 is in a kind of seal ring of providing of the present invention, another kind of typical shallow slot schematic shapes.
Figure 17 is the plan view of shape shown in Figure 16.
Figure 18 is in a kind of seal ring of providing of the present invention, another kind of typical shallow slot schematic shapes.
Figure 19 is the plan view of shape shown in Figure 18.
Figure 20 is in a kind of seal ring of providing of the present invention, another kind of typical shallow slot schematic shapes.
Figure 21 is the plan view of shape shown in Figure 20.
Figure 22 is in a kind of seal ring of providing of the present invention, another kind of typical shallow slot schematic shapes.
Figure 23 is in a kind of seal ring of providing of the present invention, another kind of typical shallow slot schematic shapes.
Figure 24 is the plan view of shape shown in Figure 23.
Figure 25 is in a kind of seal ring of providing of the present invention, another kind of typical shallow slot schematic shapes.
In figure: 1 seal face outer periphery; 2 seal face inner peripherys; 3 shallow slots; 4 circumference.
In above-mentioned each graphics, in order to more directviewing description shallow slot shape and its to be formed, be exaggerated seal face axial dimension, axial dimension value is only illustrative purposes.
Embodiment
For summary of the invention of the present invention, Characteristic can be understood further, hereby exemplify following examples, and coordinate accompanying drawing to be described in detail as follows:
Embodiment one: refer to Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5.
A kind of seal ring, there is flat seal face, seal face is provided with shallow slot, the bottom surface of shallow slot is curved surface, the bottom surface of described shallow slot be by a diameter be 175 millimeters, the curved surface that obtains after elastic recovery again of the smooth continuous curve surface that formed when creating and the seal ring making seal face be deformed into nonplanar resiliently deformable moving by the characteristics of motion of the seal face angle of inclination flat with the seal ring circumference that is 0.027 radian.Described resiliently deformable is the resiliently deformable of higher than outer periphery 57 microns of the seal face inner periphery after applying circumferentially even distributed force load to seal ring, seal ring being produced.The described characteristics of motion is that the circumference favouring seal face does the straight line motion being parallel to seal face.In this shallow slot bottom surface, the Gaussian curvature of each point is just.If cut off shallow slot by a series of plane crossing seal ring axis can obtain a series of cross section, so there is an interval, in this is interval, the area in each cross section reduces clockwise gradually; Also there is another interval, in this is interval, the area in each cross section is along counterclockwise reducing gradually.This shallow slot does not all have opening in the outer periphery of seal face and inner periphery.This shallow slot has and deepens to outside diameter the shape then shoaled gradually from internal side diameter gradually.This shallow slot is symmetrical about the radial line of seal ring, and being applicable to can the mechanical seal of bidirectional rotation.The degree of depth of this shallow slot lowest part is 5 microns.
In the present embodiment, be provided with one group of along the circumferential direction uniform, identical shallow slot at seal face, the quantity of shallow slot is 9, and these shallow slots do not connect each other, separated by a distance.
Embodiment two: refer to Fig. 6, Fig. 7, Fig. 8 and Fig. 9.
A kind of seal ring, there is flat seal face, seal face is provided with shallow slot, the bottom surface of shallow slot is curved surface, the bottom surface of described shallow slot be by a diameter be 175 millimeters, the curved surface that obtains after elastic recovery again of the smooth continuous curve surface that formed when creating and the seal ring making seal face be deformed into nonplanar resiliently deformable moving by the characteristics of motion of the seal face angle of inclination flat with the seal ring circumference that is 0.001 radian.Described resiliently deformable is the resiliently deformable of higher than outer periphery 24 microns of the seal face inner periphery after applying circumferentially even distributed force load to seal ring, seal ring being produced.The described characteristics of motion is that the circumference favouring seal face does the straight line motion being parallel to seal face and the compound motion formed perpendicular to the straight line motion of seal face.In this shallow slot bottom surface, the Gaussian curvature of each point is just.If cut off shallow slot by a series of plane crossing seal ring axis can obtain a series of cross section, so there is an interval, in this is interval, the area in each cross section reduces clockwise gradually; Also there is another interval, in this is interval, the area in each cross section is along counterclockwise reducing gradually.This shallow slot, at the inner periphery opening of seal face, has the shape shoaled gradually from internal side diameter to outside diameter.
Embodiment three: refer to Figure 10 and Figure 11.
Be that the shape of shallow slot is different from the difference of embodiment one.In the present embodiment, shallow slot is opened on the outer periphery of seal face.
Embodiment four: refer to Figure 12 and Figure 13.
Be that the shape of shallow slot is different from the difference of embodiment one.In the present embodiment, shallow slot is opened on the inner periphery of seal face.
Embodiment five: refer to Figure 14 and Figure 15.
Be that the shape of shallow slot is different from the difference of embodiment four.In the present embodiment, shallow slot is obviously asymmetric about the radial line of seal ring.The described characteristics of motion does the straight line motion being parallel to seal face and the compound motion formed around the rotation of seal ring axis by the circumference favouring seal face.
Embodiment six: refer to Figure 16 and Figure 17.
Be that the shape of shallow slot is different from the difference of embodiment one.In the present embodiment, shallow slot is the half of shallow slot in embodiment one.
Embodiment seven: refer to Figure 18 and Figure 19.
Be that the shape of shallow slot is different from the difference of embodiment three.In the present embodiment, shallow slot is the half of shallow slot in embodiment three.
Embodiment eight: refer to Figure 20 and Figure 21.
Be that the shape of shallow slot is different from the difference of embodiment four.In the present embodiment, shallow slot is the half of shallow slot in embodiment four.
Embodiment nine: refer to Figure 22.
In the present embodiment, the seal face of seal ring has offered two groups of shallow slots, and one group is the shallow slot described in embodiment seven, and another group is the shallow slot described in embodiment eight.
Embodiment ten: refer to Figure 23 and Figure 24.
A kind of seal ring, there is flat seal face, seal face is provided with the shallow slot being opened on inner periphery, the bottom surface of this shallow slot is curved surface, the bottom surface of described shallow slot be by a diameter be 175 millimeters, the curved surface that obtains after elastic recovery again of the smooth continuous curve surface that formed when creating and the seal ring making seal face be deformed into nonplanar resiliently deformable moving by the characteristics of motion of the seal face angle of inclination flat with the seal ring circumference that is 0.0005 radian.Described resiliently deformable is the resiliently deformable of higher than outer periphery 40 microns of the seal face inner periphery after applying circumferentially even distributed force load to seal ring, seal ring being produced.The described characteristics of motion is that the circumference favouring seal face does by a straight line motion perpendicular to seal face and a compound motion formed around the rotation of seal ring axis.
Embodiment 11: refer to Figure 25.
A kind of seal ring, there is flat seal face, seal face is provided with the shallow slot being opened on inner periphery, the bottom surface of this shallow slot is curved surface, the bottom surface of described shallow slot be by a diameter be 175 millimeters, the curved surface that obtains after elastic recovery again of the smooth continuous curve surface that formed when creating and the seal ring making seal face be deformed into nonplanar resiliently deformable moving by the characteristics of motion of the seal face angle of inclination flat with the seal ring circumference that is 0.0006 radian.Described resiliently deformable is the resiliently deformable of higher than outer periphery 40 microns of the seal face inner periphery after applying circumferentially even distributed force load to seal ring, seal ring being produced.The described characteristics of motion is that the circumference favouring seal face does and is parallel to the straight line motion of seal face, a straight line motion perpendicular to seal face and a compound motion formed around the rotation of seal ring axis by one.Except be provided with on seal face be opened on inner periphery shallow slot except, on seal face, be also provided with the shallow slot being opened on outer periphery, the bottom surface of this shallow slot is curved surface, this bottom surface be by a diameter be 175 millimeters, move by the characteristics of motion on undeformed seal ring with the flat seal face angle of inclination of the seal ring circumference that is 0.0005 radian time the smooth continuous curve surface that formed.
In embodiment one to embodiment 11, often organize shallow slot and all schematically offer 9, in fact, according to different sealing loads and leakage rate requirement, the quantity that seal face is offered shallow slot can be 2 ~ 200, or more.Certainly, according to the difference of closure size, the quantity of described shallow slot is general also different, and the larger then quantity of general size is more.
One described in this specification to be parallel to the rotation of straight line for axis of seal face, just for illustration of object, it is the rotation of axis that those skilled in the art also can be deformed into a straight line tilted with seal face.A straight line motion perpendicular to seal face described in this specification, also just for illustration of object, those skilled in the art can be deformed into a straight line motion tilted with seal face.One described in this specification straight line motion being parallel to seal face, also just for illustration of object, those skilled in the art can be deformed into a straight line motion tilted with seal face.
Be understandable that, when adopting the same characteristics of motion, by changing radius of a circle, each axle interaction relation, each axle initial position and each axle final position, formed shallow slot shape can be changed, namely the shallow slot adopting the same characteristics of motion to be formed may have various shape, protection scope of the present invention should not be regarded as being only limitted to the concrete shape that embodiment states, protection scope of the present invention also comprises those skilled in the art according to the present invention's design by changing radius of a circle, each axle interaction relation, the various shapes that each axle initial position and each axle final position can obtain.
Be understandable that; when adopting different motion rule; by selecting suitable radius of a circle, each axle interaction relation, each axle initial position and final position; the shallow slot formed may have similar shape, and protection scope of the present invention should not be regarded as certain shallow slot shape and can only be realized by a specific characteristics of motion.
Be understandable that the resiliently deformable described in this specification refers to recoverable distortion, produce distortion after load effect, after load removal, distortion disappears.Described load includes but not limited to power and heat.Described resiliently deformable can be uniform along seal ring circumference, also can be uneven.After resiliently deformable, seal face peak can on inner periphery, can on outer periphery, also can between interior outer periphery somewhere.
Be understandable that; the specific implementation form of the characteristics of motion described in this specification is only the citing to inventive concept way of realization; just for illustration of object; protection scope of the present invention should not be regarded as stated specific implementation form; those skilled in the art can also obtain more way of realization by the increase of motion, simplification or distortion, and scope also and other way of realization obtained by the synthesis of motion, simplification or distortion according to the present invention's design in those skilled in the art.
Be understandable that, on seal face, the chute of the conventional structure forms such as T-slot, arc groove, spiral chute, rectangle groove can also be provided with to strengthen dynamic pressure effect, or be also provided with annular groove to suppress leakage, or be provided with guiding gutter to strengthen fluid-encapsulated supply.
Be understandable that, seal ring of the present invention is applicable to various forms of mechanical seal, such as inner flow seal, outer-flowing type sealing or upstream pumping mechanical seal.
Claims (10)
1. a seal ring, there is flat seal face, seal face is provided with shallow slot, it is characterized in that: the bottom surface of described shallow slot is the curved surface that the smooth continuous curve surface formed when creating and the seal ring making seal face be deformed into nonplanar resiliently deformable moving by the characteristics of motion by a circumference obtains after elastic recovery again.
2. seal ring according to claim 1, is characterized in that, in described shallow slot bottom surface, the Gaussian curvature of each point is just.
3. seal ring according to claim 1 and 2, it is characterized in that, if cut off shallow slot by a series of plane crossing seal ring axis can obtain a series of cross section, so there is an interval, in this is interval, the area in each cross section reduces clockwise or counterclockwise gradually.
4. seal ring according to any one of claim 1 to 3, is characterized in that, described shallow slot is opened on the inner periphery of seal face, or is opened on the outer periphery of seal face, or does not all have opening in the outer periphery of seal face and inner periphery.
5. seal ring according to any one of claim 1 to 4, it is characterized in that, described shallow slot has the shape shoaled gradually from internal side diameter to outside diameter, or there is the shape shoaled gradually from outside diameter to internal side diameter, or have and deepen to outside diameter the shape then shoaled gradually from internal side diameter gradually.
6. seal ring according to any one of claim 1 to 5, is characterized in that, described shallow slot has the shape circumferentially deepening gradually and then shoal gradually, or has the shape circumferentially deepened gradually.
7. seal ring according to any one of claim 1 to 6, is characterized in that, described shallow slot is symmetrical about the radial line of seal ring, or obviously asymmetric.
8. seal ring according to any one of claim 1 to 7, is characterized in that, described shallow slot is in the projection roughly helically shape of seal face.
9. seal ring according to any one of claim 1 to 8, it is characterized in that, seal face is also provided with the shallow slot of the smooth continuous curve surface formed when groove bottom is and is moved by the characteristics of motion on undeformed seal ring by a circumference to strengthen dynamic pressure effect, or on seal face, be also provided with the chute of the conventional structure forms such as T-slot, arc groove, spiral chute, rectangle groove to strengthen dynamic pressure effect, or be also provided with annular groove to suppress leakage, or be also provided with guiding gutter to strengthen fluid-encapsulated flowing.
10. a mechanical seal device, comprise cavity, cavity is fixed with stationary ring, stationary ring is with seal face, stationary ring cover on the rotating shaft, rotatingshaft is fixed with rotating ring, also with seal face on rotating ring, stationary ring near the seal face of rotating ring, during work, two seal faces are close to laminating, have sealing medium in gap, rotatingshaft drives rotating ring to rotate relative to stationary ring, and sealing medium is by the clearance leakage between two seal faces, it is characterized in that, rotating ring or the seal ring of stationary ring according to any one of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510636716.5A CN105202194A (en) | 2015-10-01 | 2015-10-01 | Sealing ring and mechanical sealing device with same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510636716.5A CN105202194A (en) | 2015-10-01 | 2015-10-01 | Sealing ring and mechanical sealing device with same |
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| CN105202194A true CN105202194A (en) | 2015-12-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510636716.5A Pending CN105202194A (en) | 2015-10-01 | 2015-10-01 | Sealing ring and mechanical sealing device with same |
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Cited By (1)
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| CN108869749A (en) * | 2018-07-23 | 2018-11-23 | 浙江工业大学 | Open ellipse wire casing end face bidirectional rotation mechanical seal structure |
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| CN108869749B (en) * | 2018-07-23 | 2024-04-09 | 浙江工业大学 | Bidirectional rotary mechanical sealing structure for end face of open elliptic wire slot |
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Application publication date: 20151230 |