CN109812583A - Split mechanical seal monoblock type auxiliary seal ring and its online preparation method - Google Patents
Split mechanical seal monoblock type auxiliary seal ring and its online preparation method Download PDFInfo
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- CN109812583A CN109812583A CN201910159722.4A CN201910159722A CN109812583A CN 109812583 A CN109812583 A CN 109812583A CN 201910159722 A CN201910159722 A CN 201910159722A CN 109812583 A CN109812583 A CN 109812583A
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- adhesive tape
- front cover
- seal ring
- auxiliary seal
- rear cover
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Abstract
The invention discloses a kind of Split mechanical seal monoblock type auxiliary seal rings, cyclic annular in closed circle, intermediate non junction；It uses adhesive tape to be made, and a cross-linking radiation for carrying out interlude to adhesive tape first forms crosslinking section, after it will be crosslinked section and stretch, after both ends are bonded together, then carries out secondary cross-linking radiation to the both ends of adhesive tape being bonded together, is formed.Secondly, disclosed herein as well is the online preparation methods of above-mentioned auxiliary seal ring.Structure of the invention is simple, convenient manufacture.Finished product sealing ring does not have split surface, without connector, without designing sealing strip end part connecting structure.Overcome that dissection type auxiliary seal ring connecting joint linking intensity is weak or the big flexibility of rigidity is poor, and be converted into after C-shaped circular arc at circular arc docking using standard seal circle and there are problems that leakage-gap, improve the reliability and sealability of Split mechanical seal auxiliary seal ring.
Description
Technical field
The invention belongs to technical field of mechanical, assist more particularly to a kind of Split mechanical seal monoblock type close
Seal and its online preparation method.
Background technique
Split mechanical seal is mainly used for the axle envelope of the power input shafts of equipment such as pump, blender and compressor, solves
Need to dismantle the puzzlement of shaft end components when the maintenance replacement of large scale equipment axle envelope.For this purpose, Split mechanical seal uses subdivision
The dynamic and static ring of formula, elastic element use multiple groups little spring, the O-ring in gap and sealing between moving sealing ring and main shaft or axle sleeve
The O-ring in gap is also all made of dissection type O-ring between stationary ring and shell or two standard O-rings are converted into the opposed formation of semi arch
Opposite annulus.
In currently known technology, the split surface connecting joint of dissection type O-ring is there are many form, one is bridging arrangement,
Sealing ring is cut into radial section and scarf, such as US 5662340 and US 5067733, together with gluing, such as patent
The dissection type O-ring of US6068264 and ZL200810070213.6, install convenient, but this connection is there are base material and sticks
The mechanical property difference of glue deforms difference after carrying, initiation contacts unevenness or temperature change change viscose with sealing ring, shell
Property causes the problems such as its failure, poor reliability；Another is connected structure, i.e., port one end is pit, and the other end is boss,
Such as ballhead grafting ZL201310333000.9, US5571268, US4575098, conical head grafting ZL200420034695.7,
Belt carcass nose cone grafting ZL201020605143.2, fracture multiple sections bumps are with respect to grafting US 5067733, this connection
Dissection type O-ring one side manufacturing process it is complicated, on the other hand in grafting port not gluing, because of boss sectional dimension little Yi
Fracture failure and cooperation port gap is caused to increase and generate leakage；The third is buckle structure, such as
ZL200820062210.3, multiple tooth socket, which is engaged and applies viscose at buckle teeth and catching groove, increases adhesion strength, but this
The dissection type O-ring of kind connection is because the cooperation sectional dimension little Yi of tooth socket causes viscose face to tear, while multiple tooth socket is set
It is difficult that meter increases manufacture.Patent ZL200610147983.7 proposes a kind of " preparation method of large-scale fluororubber O-type ring ", i.e.,
First production both ends do not vulcanize and the cylindrical rubber item of intermediate vulcanization, then unvulcanized both ends overlap joint get up to form ring-type,
Post-cure is carried out again, can be made into major diameter fluororubber O-type ring.This method is that object is realized in dissection type sealing ring and its connection place
The homogeneity of reason mechanical property provides technical guarantee, but still cannot be used for the auxiliary seal between production rotating ring and shaft
Circle is unable to reach of the O-ring banding in shaft because of the overlap joint power at the unvulcanized both ends end of rubber strip and its subdivision
Force request.
Using two standard O-rings be converted into semi arch it is opposed formed opposite annulus be sealed rotating ring and main shaft or axle sleeve it
Between between gap and stationary seal ring and shell clearance seal there are two types of structure type.One is roll over two standard O-rings
At semi arch, opposite annulus is formed, is then placed in preset sealing element groove, such as ZL200910208462.1, no breakpoint
Without tearable, but joint exists because of circular cross-section compared with big gap, and it is unreliable to seal.Another kind is in this design concept base
On plinth, increase opposite annulus together and seal, is misplaced twice with respect to annulus interface, forms the dual-seal of similar labyrinth seal, such as
ZL201310287757.9, sealed reliable, and will not tear, while standard component still can be used, but the invention has compensation
O-ring frictional resistance big problem when ring is mobile.
Summary of the invention
To solve existing Split mechanical seal auxiliary seal ring there are above-mentioned deficiency, present invention firstly provides one kind to cut open
Fraction mechanical seal monoblock type auxiliary seal ring.The auxiliary seal ring is for dissection type rotating ring and main shaft or axle sleeve and cuts open
Sealing between fraction stationary ring and shell, Split mechanical seal is by dissection type rotating ring, dissection type stationary ring, split surface attachment bolt
It is formed with auxiliary seal ring, dissection type rotating ring is bonded with dissection type stationary ring constitutes end face dynamic sealing.Specific technical solution are as follows:
The auxiliary seal ring is cyclic annular in closed circle, intermediate non junction；
The auxiliary seal ring is made using adhesive tape, and the adhesive tape is by polyolefins fluorubber, fluororesin, acid absorbent, benefit
Strong filler and plasticizer blending and modifying are squeezed out by setting specification using extruder and are formed；Intercepted length L0=π (D0+d)+d
Adhesive tape simultaneously wraps at its both ends with the first shielding material, carries out a cross-linking radiation to in-between region using electron beam, makes glue
The intermediate region for not wrapping up the first shielding material of item forms crosslinking section, reheats crosslinking section to the crystalline melt point of fluororesin or more
10 DEG C~30 DEG C, and crosslinking section is elongated into 50-80%, so that the length of adhesive tape is reached (L1+d)=[π (D+d)+d], then rapidly
The crystalline melt point of fluororesin is cooled to hereinafter, restoring fluororesin polymer crystallization state, by crosslinking section sizing；
Then, the first shielding material is removed, the both ends of the non-irradiated crosslinking of the adhesive tape after sizing are at 45 ° along port beveling
Angle fracture；
The adhesive tape is placed on again in the annular type chamber for the connector molding die that the intracavitary diameter of type is D, makes the adhesive tape two to break
Mouth is bound up to form auxiliary seal ring intermediate annular in shape；
It is close to assisting using electron beam after the crosslinking section of the auxiliary seal ring intermediate is wrapped with secondary shielding material again
The region of cross-linking radiation does not carry out secondary cross-linking radiation and the crosslinking section of elongation is then heated to fluorine tree on seal intermediate
More than the crystalline melt point of rouge 10 DEG C~30 DEG C, makes the crosslinking section elongated retraction, obtain auxiliary seal ring；
Wherein: D0 is the internal diameter of auxiliary seal ring；D is the internal diameter of the type groove of connector molding die；D is auxiliary seal ring
Line footpath, the i.e. difference of the outer diameter of auxiliary seal ring and internal diameter half；L1 is that intermediate region is crosslinked and elongates, both ends are chamfer along port
The axle center line length of the adhesive tape of 45° angle fracture.
Preferably, the section configuration of auxiliary seal ring is O shape, rectangular or X-shaped.
The preparation principle of the application are as follows:
Using " memory " characteristic of subregion cross-linking method and high molecular material, Split mechanical seal monoblock type is realized
Auxiliary seal ring preparation.The subregion cross-linking method refers to and carries out intermediate region irradiation to the raw rubber adhesive tape initially prepared
Crosslinking, both ends not cross-linking radiation, then heating irradiance cross-linking zone, stretch and cool down rapidly and be formed, then not to raw rubber adhesive tape
Cross-linking radiation and the two end regions progress cross-linking radiation for having overlapped connection；" memory " characteristic of the high molecular material, refers to rubber
The high molecular material of glue and resin composition, after cross-linking radiation, heating makes Resin crystallization melting transition viscoelastic state, and stretching is simultaneously rapid
Cooling, resin generates crystallization and returns elastomeric state, contends at this time by the screen resilience of the support force of elastomeric state resin and rubber, when two
When person's balance or support force are greater than screen resilience, above-mentioned deformation just is saved；After sizing, if heating high molecular material to resin
The melting temperature of crystallization, resin are again transformed into viscoelastic state, and resin loses bracing force at this time, enter and are with rubber screen resilience
In the main stage, under the action of rubber screen resilience, polymer composite restores to the original state.
This auxiliary seal ring avoids in the prior art, is bonded using scene or forms combination sealing using multiple-sealed circle
Defect, guarantee sealing effect.
In addition, the application also provides the online preparation method of above-mentioned Split mechanical seal monoblock type auxiliary seal ring,
Its step are as follows:
(1) both ends of adhesive tape are wrapped with the first shielding material, a cross-linking radiation is carried out under the radiation of electron beam, is made
The intermediate region for not wrapping up the first shielding material of adhesive tape forms crosslinking section, then heats to the crosslinking section, reaches temperature
10 DEG C~30 DEG C more than to the crystalline melt point of fluororesin, and crosslinking section is stretched, the crosslinking section after stretching is then cooled to fluorine
The crystalline melt point of resin is hereinafter, will crosslinking section sizing；
(2) the first shielding material is removed, the both ends of the not cross-linking radiation of adhesive tape are mitered into 45° angle fracture along port,
Two beveling fracture docking are placed in the type groove of connector molding die and are squeezed, make adhesive tape does not carry out a cross-linking radiation
Both ends be coupled as one, formed auxiliary seal ring intermediate；
(3) secondary cross-linking radiation is carried out to the region for not carrying out a cross-linking radiation of auxiliary seal ring intermediate, completed
After crosslinking with radiation, the crosslinking section of elongation, which is heated to 10 DEG C~30 DEG C of the crystalline melt point of fluororesin or more, returns the crosslinking section elongated
Contracting, obtains auxiliary seal ring.
Preferably, crosslinking section is stretched using stretching device, which includes a fixed chuck, an activity folder
Head, a screw rod, a motor and a bracket；
Wherein, fixed chuck and motor are separately mounted to the opposite both ends of bracket, and one end of screw rod is mounted on motor
On output shaft, the other end of screw rod extends to the direction of fixed chuck, and active chuck is rotatably mounted on screw rod and is located at solid
Between clamp head and motor, guide rail is installed between fixed chuck and motor, a planker is provided on guide rail, the planker is solid
Dingan County, when the rotation of motor driven screw rod, can be such that active chuck moves along screw rod on active chuck, and lead planker edge
Rail sliding；
Fixed chuck and movable chuck are for clamping adhesive tape.
It is using the beneficial effect that stretching device stretches crosslinking section: can be according to the type groove of connector molding die
Internal diameter stretches a cross-linking radiation section, so that the length of adhesive tape is accurately reached (L1+d)=[π (D+d)+d], it is ensured that auxiliary seal ring
Compact dimensions.
Preferably, the connector molding die includes ring body annular in shape, has one to be used to accommodate adhesive tape in the ring body
Annular cavity, the annular cavity have a central axes；One perpendicular to the central axes the first plane the ring body is cut to before
Annular cavity is cut to front cover chamber and rear cover chamber by lid and rear cover, the first plane, and front cover chamber and rear cover chamber are relative to the first plane
It is symmetrical arranged, wherein front cover chamber is located on front cover, and rear cover chamber covers after being located at；
Front cover is cut to the first front cover and the second front cover by the second plane of central axes by one, and the second plane is by front cover chamber
It is cut to the first front cover chamber and the second front cover chamber, the first front cover chamber and the second front cover chamber are symmetrical arranged relative to the second plane,
Wherein the first front cover chamber is located on the first front cover, and the second front cover chamber is located on the second front cover；
Rear cover is cut to the first rear cover and the second rear cover by second plane, after rear cover chamber is cut to first by the second plane
Lid chamber and the second rear cover chamber, the first rear cover chamber and the second rear cover chamber are symmetrical arranged relative to the second plane, wherein the first rear cover
Chamber covers after being located at first, and the second rear cover chamber covers after being located at second；
First bolt links together the first front cover and the first rear cover, and the second bolt connects the second front cover and the second rear cover
It is connected together；
Preceding bonnet bolt links together the first front cover and the second front cover, and rear bonnet bolt connects the first rear cover and the second rear cover
It is connected together；
Above-mentioned annular cavity is formed as the type groove for being squeezed adhesive tape.
Adhesive tape end 45° angle fracture is suppressed using connector molding die, is advantageously ensured that among formed auxiliary seal ring
The fracture connection quality of body realizes the subdivision of auxiliary seal ring and its homogeneity of connection place physical and mechanical property.
Further, the internal diameter relationship of the internal diameter and auxiliary seal ring of the type groove of connector molding die are as follows:
The beneficial effect for providing connector molding die type groove inside diameter ranges is: ensure that in from raw rubber item to auxiliary seal ring
Mesosome, the operability for arriving auxiliary seal ring preparation process again.
Further, the both ends of adhesive tape are respectively 5d, one subradius of carry out of adhesive tape with the length that the first shielding material wraps
Length according to crosslinking is L=L0-10d.
After the region of 5d long to the both ends of adhesive tape is wrapped using the first shielding material, after making adhesive tape intermediate region cross-linking radiation
The not irradiated influence of both ends adhesive tape, be still able to maintain initial performance, crimp to be formed among auxiliary seal ring convenient for subsequent both ends
Body；Long 5d is stayed at both ends, on the one hand guarantees the length of intermediate cross-linking radiation section, transition is avoided to stretch, and restores line footpath ruler convenient for pyrocondensation
It is very little；On the other hand, facilitate both ends docking, pressure connection.
Preferably, twice cross-linking radiation when, irradiation dose uses and from starting point 0 is gradually increased to stationary value, again from steady
Determine dosage and gradually decrease to end point 0, to guarantee that dosage is consistent on irradiation each section of border region twice.
Preferably, cooling rate when being cooled down after the stretch to crosslinking section are as follows: 5 DEG C/s~10 DEG C/s.
With such speed fast cooling, mixed and disorderly unordered, point that randomly tangles in molten state originally is advantageously allowed
Subchain moment during rapid cooling reaches regularly arranged, forms crystallization and is formed.
Beneficial effects of the present invention:
(1) structure is simple, convenient manufacture.Finished product sealing ring does not have split surface, without connector, without designing sealing strip end
Coupling structure.
(2) the monolithic construction design of auxiliary seal ring improves auxiliary seal ring service duty parameter such as temperature, pressure
Ability.
(3) auxiliary seal ring size can preferably be controlled.
(4) monoblock type auxiliary seal ring, overcomes that dissection type auxiliary seal ring connecting joint linking intensity is weak or rigidity is big
It is flexible poor, and be converted into after C-shaped circular arc at circular arc docking using standard seal circle and there are problems that leakage-gap, improve subdivision
The reliability and sealability of formula mechanical seal auxiliary seal ring.
Detailed description of the invention
Fig. 1 is the adhesive tape after the mixing that extruder squeezes out.
Fig. 2 be will after two end shields of adhesive tape to in-between region carry out cross-linking radiation schematic diagram.
Fig. 3 is the main view of stretching device.
Fig. 4 is the left view of Fig. 2.
Fig. 5 is the schematic shapes after the both ends beveling of adhesive tape.
Fig. 6 is the schematic diagram after the both ends of adhesive tape are bonded as one.
Fig. 7 is the top view of Fig. 6.
Fig. 8 is molding die main view.
Fig. 9 be in Fig. 8 A-A to sectional view.
Figure 10 is the left view of Fig. 8.
Figure 11 be Figure 10 in C-C to sectional view.
Figure 12 is the auxiliary seal ring after pyrocondensation.
Specific embodiment
Please refer to Figure 12, the circular cross-section of made auxiliary seal ring in the present embodiment, with internal diameter D0=
The free size of 60mm, line footpath d=5.3mm.
Relevant equipment is illustrated first below.
Stretching device is illustrated first, please refers to Fig. 3 and Fig. 4, which includes a fixed chuck 101, one
Active chuck 102, a screw rod 6, a motor 5 and a bracket 8.
Bracket 8 is in long strip, installs motor 5 and fixed chuck 101 respectively at the both ends of the length direction of bracket 8.Screw rod 6
It is arranged on bracket 8, and one end of screw rod 6 is mounted on the output shaft of motor 5, the other end of screw rod is to fixed chuck 101
Direction extends.
Active chuck 102 is rotatably mounted on screw rod 6 and between fixed chuck 101 and motor 5, is pressed from both sides in activity
Through-hole is offered on first 102, is formed with the internal screw thread being meshed with the external screw thread of screw rod in the through hole, makes motor in driving silk
Bar rotate when, active chuck 102 can the length direction under the drive of screw thread along screw rod 6 move.
Guide rail 7 is installed between fixed chuck 101 and motor 5, a planker 9 is provided on guide rail, the planker 9 is fixed
It is mounted on active chuck 102, when active chuck is moved along screw rod, synchronous drive planker is slided along guide rail.
Fixed chuck 101 and movable chuck 102 are for clamping following adhesive tape 3.Make movable chuck towards far from fixed chuck
Direction it is mobile when, the adhesive tape being clamped on fixed chuck 101 and movable chuck 102 can be elongated.
Following butt joint molding die is illustrated.
Fig. 8 to Figure 11 is please referred to, which includes ring body 100 annular in shape, has one to use in the ring body 100
In the annular cavity 60 for accommodating adhesive tape, which has a central axes 110, in fig. 8, to indicate clear, the axis
Line 110 is indicated using a small circle.
The ring body 100 is cut to front cover 20 and rear cover 40 perpendicular to the first plane 200 of the central axes 110 by one, and first
Annular cavity is cut to front cover chamber 61 and rear cover chamber 62 by plane 200, and front cover chamber 61 and rear cover chamber 62 are relative to the first plane 200
It is symmetrical arranged, wherein front cover chamber 61 is located on front cover 20, and rear cover chamber 62 is located on rear cover 40.
Front cover 20 is cut to the first front cover 21 and the second front cover 22 by the second plane 300 of central axes 110 by one, and second
Front cover chamber is cut to the first front cover chamber and the second front cover chamber by plane 300, and the first front cover chamber and the second front cover chamber are relative to
Two planes are symmetrical arranged, wherein the first front cover chamber is located on the first front cover, the second front cover chamber is located on the second front cover.
Rear cover 40 is cut to the first rear cover 41 and the second rear cover 42 by second plane 300, and the second plane 300 is by rear cover chamber
It is cut to the first rear cover chamber and the second rear cover chamber, the first rear cover chamber and the second rear cover chamber are symmetrical arranged relative to the second plane,
Wherein the first rear cover chamber covers after being located at first, and the second rear cover chamber covers after being located at second.
First bolt 53 links together the first front cover 21 and the first rear cover 41, the second bolt 54 by the second front cover 22 with
Second rear cover 42 links together.
Preceding bonnet bolt 25 links together the first front cover 21 and the second front cover 22, rear bonnet bolt 45 by the first rear cover 41 with
Second rear cover 42 links together.
Specifically in the present embodiment, the flange 120 of Flange-shaped Parts, the first bolt and the second bolt are formed in ring body 100
By respectively connecting the first front cover 21 and the first rear cover 41 and the second front cover 22 with the second rear cover 42 through the flange 120
It is connected together.
To be separated convenient for the first front cover that will be superimposed together with the first rear cover, and the second front cover that will be superimposed together
It is separated with the second rear cover, in the present embodiment, has been additionally provided with top fastening bolt 52 on above-mentioned flange 120.Meanwhile for by front cover with
Rear cover can accurately be superimposed together, and dowel hole is also provided on flange 120, positioning pin 51 is for being inserted into positioning pin
In hole, front cover and rear cover are accurately overlapped.
Annular cavity 60 is formed as the type groove for being squeezed adhesive tape 3.In Figure 11, adhesive tape 3 is received into the type groove
It is interior, for two ends of the adhesive tape of strip to be squeezed and are combined together.
Preceding bonnet bolt 25 links together the first front cover 21 and the second front cover 22, rear bonnet bolt 45 by the first rear cover 41 with
Second rear cover 42 links together.
This connector molding die is first to be connect the first front cover 21 with the second front cover 22 with preceding bonnet bolt 25 when in use
Front cover is formed together, first rear cover 41 and the second rear cover 42 are joined together to form rear cover with rear bonnet bolt 45, by glue
After item is put into type groove, then with the first bolt 53 and the second bolt 54 front cover and rear cover are linked together, to adhesive tape progress
It squeezes.
For the installation convenient for preceding bonnet bolt and rear bonnet bolt, in the present embodiment, in the first front cover and the second front cover
It is each formed with outwardly projecting first protrusion 28 on the outside of both ends, is each formed with front cover bolt hole in each first protrusion 28
27, after the both ends of the first front cover and the second front cover are abutted together, preceding bonnet bolt is passed through into front cover bolt hole and is fastened, with structure
At a complete front cover.
Outwardly projecting second protrusion 48 is each formed on the outside of the both ends of the first rear cover and the second rear cover, each
It is each formed with back cover bolt hole 47 in two protrusions 48, after the both ends of the first rear cover and the second rear cover are abutted together, by rear cover
Bolt passes through back cover bolt hole and fastens, to constitute a complete rear cover.
For convenient for extra sizing material capable of being made to be smoothly discharged out annular cavity, opened up on front cover when squeezing adhesive tape
There is the plastic hole 24 of connection annular cavity to avoid sizing material in annular so that annular cavity is in an organized way discharged in excessive sizing material
Amorphous flowing is generated in chamber, influences the quality of sealing ring.
Annular cavity is formed as the type groove for being squeezed adhesive tape.According to formula
The internal diameter D for calculating type groove, obtains 85.1mm≤D≤100.1mm, in the present embodiment, takes D=90mm.
The production of auxiliary seal ring is illustrated below.
In the present embodiment, for the auxiliary seal ring between Split mechanical seal rotating ring and main shaft or axle sleeve.
By weight percentage, by 26 type fluorubber 64%, MgO acid absorbent 5%, reinforcing filler includes carbon black 10% and carbon
Sour calcium inorganic filler 10%, fluorubber masterbatch is made in the mixing of fluorine wax plasticizer 1%, and temperature is controlled in FEP fluororesin
Blending and modifying together is added in fluorubber masterbatch in 10%FEP fluororesin by processing temperature；Diameter of section is squeezed out using extruder
For the adhesive tape of 5.3mm, the diameter of section of the adhesive tape is the line footpath d of auxiliary seal ring.
Fig. 1 and Fig. 2 are please referred to, according to formula L0=π (D0+d)+d, the adhesive tape 3 of long L0=210.5mm is intercepted, by both ends
It is wrapped with the first shielding material 4, the length wrapped is 5d, i.e. 26.5mm utilizes the scanning electron of high frequency high voltage electron accelerator 1
Beam irradiation adhesive tape carries out a cross-linking radiation under 90kGy dosage, and the not shielded intermediate region of adhesive tape is made to form crosslinking section, figure
In 2, label 2 indicates the electron beam that high frequency high voltage electron accelerator 1 projects.The both ends for being crosslinked section are clamped in stretching device respectively
Fixed chuck 101 and active chuck 102 on, and more than heat cross-linking section to the crystalline melt point (265 DEG C) of FEP fluororesin 10 DEG C
~30 DEG C, while slowly force, so that the length L for being crosslinked section is increased by 59.8%, is then rapidly cooled to FEP fluororesin crystalline melt point
(265 DEG C) hereinafter, FEP fluororesin polymer crystallization state restore, deformation " being freezed " and be formed, reach the total length L 1+d of adhesive tape
To [π (D+d)+d], i.e. 304.7mm；Referring to Fig. 5, then, the mixing adhesive tape both ends of non-irradiated crosslinking are mitered into along port
45° angle fracture makes the axle center line length L1 of adhesive tape reach π (D+d).
Carry out the length L=L0-10d an of cross-linking radiation, specifically in the present embodiment, L=157.5mm, L1=
299.4mm。
In the present embodiment, when cooling down to the adhesive tape for stretching post-crosslinking, cooling rate is controlled in 8 DEG C/s.
It is placed in into after being parallel to the faying face docking of first end cover and second end cover according to both ends fracture ellipse short shaft line
In the first end cover of pattern tool and the annular cavity (i.e. type groove) of second end cover, with the first bolt and the second bolt by front cover and after
Lid connects, and presses to the both ends of adhesive tape, is bonded together both ends, forms the uncrosslinked preparation of part crosslink part
The auxiliary seal ring intermediate of size；Auxiliary seal ring intermediate 400 after taking out end compacting connection in molding die, should
The general shape of auxiliary seal ring intermediate please refers to Fig. 6, Fig. 7.
Crosslink part in the auxiliary seal ring intermediate is wrapped with secondary shielding material, among auxiliary seal ring
The both ends for not carrying out cross-linking radiation of body equally use 90kGy dosage to carry out secondary cross-linking radiation, and it is fully crosslinked to form monoblock type
, preparation size auxiliary seal ring.
Influence in view of irradiation dose difference to auxiliary seal ring physical and mechanical property irradiates adhesive tape intermediate region and two
When holding end transitional region, the mode of the protection of Ying Caiyong shielding material and the gradual change of whole story irradiation dose is to keep entire auxiliary seal
It is equivalent to enclose irradiation dose in length.
+ 10 DEG C~30 DEG C of region to the crystalline melt point (265 DEG C) of FEP fluororesin or more is elongated in heating, makes to prepare size
Auxiliary seal ring pyrocondensation, to obtain the auxiliary seal ring of the free size of product internal diameter D0=60mm, line footpath d=5.3mm.
In the present embodiment, the first shielding material and secondary shielding material are all made of lead fiber.Certainly, in other embodiments
In, the first shielding material and secondary shielding material can also be different.In other embodiments, the first shielding material and secondary shielding
Material can also the fabric made of lead fiber or stainless steel fibre braiding.
When being crosslinked twice, irradiation dose use from starting point 0 be gradually increased to stationary value, again from consistent dose gradually
It is reduced to end point 0, to guarantee that dosage is consistent on irradiation each section of border region twice.
Claims (9)
1. a kind of Split mechanical seal monoblock type auxiliary seal ring, it is characterised in that:
The auxiliary seal ring is cyclic annular in closed circle, intermediate non junction；
The auxiliary seal ring is made using adhesive tape, which is filled out by polyolefins fluorubber, fluororesin, acid absorbent, reinforcement
Agent and plasticizer blending and modifying are filled, squeezed out using extruder by setting specification and is formed；Intercepted length L0=π (D0+d)+d adhesive tape
And wrap at its both ends with the first shielding material, a cross-linking radiation is carried out to in-between region using electron beam, makes adhesive tape
The intermediate region for not wrapping up the first shielding material forms crosslinking section, reheats 10 DEG C of crosslinking section to the crystalline melt point of fluororesin or more
~30 DEG C, and crosslinking section is elongated into 50-80%, so that the length of adhesive tape is reached (L1+d)=[π (D+d)+d], it is then cooling rapidly
To fluororesin crystalline melt point hereinafter, make fluororesin polymer crystallization state restore, will crosslinking section sizing；
Then, the first shielding material is removed, the both ends of the non-irradiated crosslinking of the adhesive tape after sizing are mitered into 45° angle along port and are broken
Mouthful；
The adhesive tape is placed on again in the annular type chamber for the connector molding die that the intracavitary diameter of type is D, makes two fracture connection of the adhesive tape
Knot forms auxiliary seal ring intermediate annular in shape together；
After the crosslinking section of the auxiliary seal ring intermediate is wrapped with secondary shielding material again, using electron beam to auxiliary seal ring
The region of cross-linking radiation does not carry out secondary cross-linking radiation and the crosslinking section of elongation is then heated to fluororesin on intermediate
More than crystalline melt point 10 DEG C~30 DEG C, makes the crosslinking section elongated retraction, obtain auxiliary seal ring；
Wherein: D0 is the internal diameter of auxiliary seal ring；D is the internal diameter of the type groove of connector molding die；D is the line of auxiliary seal ring
Diameter；L1 be intermediate region be crosslinked and elongates, both ends along port beveling 45° angle fracture adhesive tape axle center line length.
2. auxiliary seal ring according to claim 1, it is characterised in that: the section configuration of auxiliary seal ring is O shape, rectangular
Or X-shaped.
3. the online preparation method of Split mechanical seal as claimed in claim 1 or 2 monoblock type auxiliary seal ring, feature exist
In: steps are as follows:
(1) both ends of adhesive tape are wrapped with the first shielding material, a cross-linking radiation is carried out under the radiation of electron beam, makes adhesive tape
Do not wrap up the first shielding material intermediate region formed crosslinking section, then the crosslinking section is heated, temperature is made to reach fluorine
More than the crystalline melt point of resin 10 DEG C~30 DEG C, and crosslinking section is stretched, then the crosslinking section after stretching is rapidly cooled to fluorine tree
The crystalline melt point of rouge is hereinafter, will crosslinking section sizing；
(2) the first shielding material is removed, the both ends of the not cross-linking radiation of adhesive tape are mitered into 45° angle fracture along port, by two
Beveling fracture docking, which is placed in the type groove of connector molding die, to be squeezed, and make adhesive tape does not carry out the two of a cross-linking radiation
End is coupled as one, and forms auxiliary seal ring intermediate；
(3) secondary cross-linking radiation is carried out to the region for not carrying out a cross-linking radiation of auxiliary seal ring intermediate, completes radiation
After crosslinking, the crosslinking section of elongation, which is heated to 10 DEG C~30 DEG C of the crystalline melt point of fluororesin or more, makes the crosslinking section elongated bounce back,
Obtain auxiliary seal ring.
4. online preparation method according to claim 3, it is characterised in that: drawn using stretching device crosslinking section
It stretches, which includes a fixed chuck, an active chuck, a screw rod, a motor and a bracket；
Wherein, fixed chuck and motor are separately mounted to the opposite both ends of bracket, and one end of screw rod is mounted on the output of motor
On axis, the other end of screw rod extends to the direction of fixed chuck, and active chuck is rotatably mounted on screw rod and is located at fixing clamp
Between head and motor, guide rail is installed between fixed chuck and motor, a planker is provided on guide rail, the fixed peace of the planker
On active chuck, when the rotation of motor driven screw rod, active chuck can be made to move along screw rod, and keep planker sliding along guide rail
It is dynamic；
Fixed chuck and movable chuck are for clamping adhesive tape.
5. a kind of online preparation method of Split mechanical seal according to claim 3 monoblock type auxiliary seal ring,
It is characterized by: the connector molding die includes ring body annular in shape, the ring for being used to accommodate adhesive tape with one in the ring body
Shape inner cavity, the annular cavity have a central axes；One perpendicular to the central axes the first plane by the ring body be cut to front cover and
Annular cavity is cut to front cover chamber and rear cover chamber by rear cover, the first plane, and front cover chamber and rear cover chamber are symmetrical relative to the first plane
Setting, wherein front cover chamber is located on front cover, and rear cover chamber covers after being located at；
Front cover is cut to the first front cover and the second front cover by the second plane of central axes by one, and the second plane cuts off front cover chamber
For the first front cover chamber and the second front cover chamber, the first front cover chamber and the second front cover chamber are symmetrical arranged relative to the second plane, wherein
First front cover chamber is located on the first front cover, and the second front cover chamber is located on the second front cover；
Rear cover is cut to the first rear cover and the second rear cover by second plane, and rear cover chamber is cut to the first rear cover chamber by the second plane
With the second rear cover chamber, the first rear cover chamber and the second rear cover chamber are symmetrical arranged relative to the second plane, wherein the first rear cover chamber position
It is covered after first, the second rear cover chamber covers after being located at second；
First bolt links together the first front cover and the first rear cover, and the second front cover and the second rear cover are connected to by the second bolt
Together；
Preceding bonnet bolt links together the first front cover and the second front cover, and the first rear cover and the second rear cover are connected to by rear bonnet bolt
Together；
Above-mentioned annular cavity is formed as the type groove for being squeezed adhesive tape.
6. online preparation method according to claim 5, it is characterised in that:
The internal diameter of the type groove of connector molding die and the internal diameter relationship of auxiliary seal ring are as follows:
7. online preparation method according to claim 3, it is characterised in that:
The both ends of adhesive tape are respectively 5d, the length of cross-linking radiation of carry out for adhesive tape with the length that the first shielding material wraps
For L=L0-10d.
8. online preparation method according to claim 3, it is characterised in that:
Twice when cross-linking radiation, irradiation dose uses from starting point 0 and is gradually increased to stationary value, gradually subtracts from consistent dose again
It is small to arrive end point 0, to guarantee that dosage is consistent on irradiation each section of border region twice.
9. online preparation method according to claim 3, it is characterised in that:
Cooling rate when being cooled down after the stretch to crosslinking section are as follows: 5 DEG C/s~10 DEG C/s.
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| CN110539428A (en) * | 2019-10-15 | 2019-12-06 | 咸阳裕华橡胶制品有限公司 | Preparation method of rubber sealing element and vulcanization mold thereof |
| CN117145962A (en) * | 2023-10-30 | 2023-12-01 | 沈阳精航科技有限公司 | Method for improving deformation elasticity of fluid seal C-shaped sealing ring |
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| CN109812583B (en) | 2020-04-03 |
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