CN202597885U - Self-sealing device of high-temperature and high-pressure valve - Google Patents
Self-sealing device of high-temperature and high-pressure valve Download PDFInfo
- Publication number
- CN202597885U CN202597885U CN 201220249435 CN201220249435U CN202597885U CN 202597885 U CN202597885 U CN 202597885U CN 201220249435 CN201220249435 CN 201220249435 CN 201220249435 U CN201220249435 U CN 201220249435U CN 202597885 U CN202597885 U CN 202597885U
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- pressure plate
- filler
- movable pressure
- spring
- self
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Abstract
The utility model relates to a self-sealing device of a high-temperature and high-pressure valve, comprising a spring and a pagoda type multilayer annular packing, wherein the packing is inlaid in an annular groove formed after a step hole of a fixed ring and a valve rod are assembled and is fastened and positioned by a fixing pressure plate through bolts, an annular movable pressure plate is arranged at the bottom of the pagoda type multilayer annular packing, the top part of the movable pressure plate is an outer convex wedged annular surface, the outer convex wedged annular surface is tightly adhered to an inner concave wedged annular surface of the packing, the bottom part of the movable pressure plate is a plane and is circumferentially and uniformly provided with a plurality of cylindrical holes, a spring is installed in each cylindrical hole of the movable pressure plate, the upper end of each spring is butted to the bottom surface of each cylindrical hole, the lower end of each spring is butted to the end surface of the step hole of the fixed ring, and a certain installation gap is left between the bottom surface of the movable pressure plate and the end surface of the step hole of the fixed ring. The self-sealing device can automatically compensate the gap of the valve generated due to abrasion and other reasons and has the advantages that the sealing performance is good, the packing is prevented from leaking outwards, and the service life is long.
Description
Technical field
The utility model relates to a kind of valve sealing device, relates in particular to the self-seal device of a kind of high temperature, high pressure valve.
Background technique
At present, China is used for the high-temperature high pressure valve of Texaco and shell apparatus system, requires very high for leaking outside of medium; The leakage of these media tends to cause huge security incident; Like leaking outside of high-temperature oxygen valve, might produce blast, bring immeasurable economic loss; If the valve leakage out of steam system of toxic and harmful medium then can pollute atmosphere.And these valves are easy to generate the place that leaks outside most in stem packing place.Because the frequent switch of valve, valve rod can cause certain wearing and tearing to filler, and when wearing and tearing reached a certain amount of, medium just can produce and leak outside.The phenomenon that filler leaks outside appears in regular meeting when the service condition lower valve of high pressure, high temperature media; The valve that constantly changes of medium temperature particularly, because the instability of temperature, when receiving high temperature; Valve rod expands, filler also expands, the stuffing box space diminishes, and filler is compressed.After temperature descended, valve rod shrank, and filler also shrinks, and it is big that the stuffing box space becomes, and filler need discharge a part of decrement and fill up the space that stuffing box increases.Through expansion, contraction repeatedly, the initial compression amount of final filler just makes between filler and the valve rod and produces the gap after all having discharged, and medium is leaked outside.If in time do not find also to handle, along with the increase of leakage rate, will not cause valve rod and wash away, cause expendable destruction, can only the separation valve door pressure release in addition valve roll off the production line and change valve rod and filler.Influence whole system operation and production, directly cause serious economic loss.
In order to improve the valve seal performance, in the existing technology, on the filler stationary platen, increase elastic washer, filler is carried out certain compensation because of the gap of wearing and tearing or the generation of distortion back.But, when filler wearing and tearing and distortion reach a certain amount of after, elastic washer can't continue to provide the compensation of pretightening force, causes the valve packing seal failure to leak outside at last.
A kind of in addition structure is for to add the group spring on the filler stationary platen, the principle that adds elastic washer of this method and front is identical, just on compensation rate, increase to some extent, but in high pressure, length of spring compressed is too much, and stationary platen comes off, and causes filler to leak outside.
Summary of the invention
In order to change existing valve self sealing structure, the situation that is rubbed and cause valve packing to leak outside in Yin Gaowen, the high-pressure medium with variation of temperature.The purpose of the utility model is to provide the self-seal device of a kind of high temperature, high pressure valve; This device not only can compensate filler automatically and produce the gap because of wearing and tearing, contraction, high pressure draught wash away; And the phenomenon that can avoid filler to leak outside takes place; Make valve remain good sealing, avoid also having the advantage in the working life that can prolong high-temperature high pressure valve simultaneously because of the medium leakage causes the accident to the medium of high temperature, high pressure.
The utility model is achieved in that and comprises spring and pagoda type multi-layer annular filler; Described filler down is contained in the step hole and the valve rod of retainer ring and assembles in the annular groove of back formation, and is located through bolton by stationary platen, and the bottom of pagoda type multilayer filler is provided with the movable pressure plate of circular shape; The top of movable pressure plate is an evagination wedge ring face; The indent wedge ring face of this evagination wedge ring face and filler fits tightly, and the bottom of movable pressure plate is the plane, and is provided with the some cylindrical holes that circumferentially are uniformly distributed with; Spring is installed in the cylindrical hole of movable pressure plate; The upper end of spring is resisted against on the bottom surface of cylindrical hole, and its lower end abutment is on the end face of retainer ring step hole, and movable pressure plate bottom surface and retainer ring step hole end face have assemblage gap.
The external diameter of said movable pressure plate is less than the external diameter of filler, and internal diameter is greater than the external diameter of filler.
Said spring is a helical spring, and its external diameter is less than the internal diameter of cylindrical hole, and free length is greater than the degree of depth of movable pressure plate cylindrical hole.
Said cylindrical hole is at least 6, and the quantity of spring is corresponding with cylindrical hole.
The contract type angle of the evagination wedge ring face at said movable pressure plate top is 100 °.
The contract type angle of the evagination wedge ring face at filler top is 100 °, and the contract type angle of the indent wedge ring face of bottom is 90 °.
Said movable pressure plate is to adopt high temperature resistant, corrosion resistant metallic material to make.
Owing to adopt said structure; The utility model provides pretightening force by stuffing box inside; And the active force through medium realizes the selfsealings performance of filler, and the utility model can compensate the gap that produces because of wearing and tearing and other reasons automatically, and (pressure of medium becomes gland sealed power in the valve, and pressure medium is high more; Sealing effect is good more), have good seal performance.The relative position of stationary platen and retainer ring is not in case behind the adjustment location, can effectively prevent leaking outside of filler, long service life because of internal pressure changes.
Description of drawings
Fig. 1 is the valve internal structural drawing.
Fig. 2 is the enlarged view A among Fig. 1.
Fig. 3 is the movable pressure plate structural drawing.
Fig. 4 is the structural drawing of filler.
Fig. 5 is the structural drawing of retainer ring.
The 1-filler, 1a-evagination wedge ring face, 1b-indent wedge ring face, 2-movable pressure plate, the evagination wedge ring face of 2a-movable pressure plate; The 2b-cylindrical hole, 3-spring, 4-valve rod, 5-stationary platen; The 6-retainer ring, 6a-retainer ring step hole, 6b-step hole end face, 7-bolt.
Embodiment
For better explanation the utility model intention,, the utility model is described further below through embodiment and combine Fig. 1 to Fig. 4.
Shown in Fig. 1 to 4: a kind of pagoda type self-seal device, comprise at least 6 springs 3 and pagoda type multi-layer annular filler 1, the top of described filler 1 is evagination wedge ring face 1a, its contract type angle is 100 °; The filler bottom is indent wedge ring face 1b, and its contract type angle is 90 °.This filler 1 down is contained in the annular groove of retainer ring step hole 6a and valve rod assembling back formation, and adjusts stationary platens 5 and fastening location through bolt 7.
Be provided with the movable pressure plate 2 of the circular shape that adopts the stainless steel making in the bottom of pagoda type filler 1; The top of this movable pressure plate is that contract type angle is 100 ° evagination wedge ring face 2a; The contract type degree of the evagination wedge ring face of movable pressure plate and filler is that 90 ° indent wedge ring face 1a fits tightly; The movable pressure plate bottom is the plane, and is processed with at least 6 cylindrical hole 2b that circumferentially are uniformly distributed with.The external diameter of movable pressure plate is slightly less than the external diameter of filler, and it is interior through being slightly larger than the internal diameter of filler.
Described spring 3 is columniform springs, is installed in the cylindrical hole 2b of movable pressure plate 2, and the quantity of spring is corresponding with cylindrical hole.The external diameter of spring is less than the internal diameter of cylindrical hole 2b; Its free length is greater than the degree of depth of cylindrical hole; During installation; The upper end of spring withstands on the bottom surface of cylindrical hole 2b, and the lower end withstands on the end face 6b of retainer ring step hole, leaves certain assemblage gap between the bottom surface of movable pressure plate 2 and the retainer ring step hole end face 6b.
First kind of selfsealings mode of this device: after above-mentioned member installs; Regulate pretightening force through the adjustment bolt; Be that stationary platen produces reaction force to spring, pretightening force is big more, and stationary platen 5 is just big more with the clamping force that 2 pairs of fillers of movable pressure plate apply; The radial expansion volume of filler is also just big more, and sealing is just tighter.Adjust suitable pretightening force, excessive to avoid pretightening force, cause the increase of valve moment, the filler wearing and tearing are accelerated.Pretightening force is provided by spring in this device.
When filler is worn and after producing the gap, spring can discharge tension force automatically, and the extruding filler makes its axial compression decrement, and the radial expansion compensate for clearance realizes from motive sealing.
Second kind of selfsealings mode of this device: owing to leave certain assemblage gap between movable pressure plate 2 bottom surfaces and the retainer ring step end face 6b; When medium leaks outside, at first get into this gap, himself pressure just produces thrust on the end face of movable pressure plate; Can make filler axial compression decrement equally; Radial expansion is filled up the gap automatically, makes valve keep the normality sealing.
This device is provided with a movable pressure plate that is promoted by spring in filler bottom, this structure can be avoided utilizing outside pressing plate to compensate in the existing technology and fatal drawback that the filler that causes leaks.This is because movable pressure plate is provided with inside, and outside stationary platen in case behind the adjustment location, be fixed, can effectively not prevent leaking outside of filler because of length of spring compressed excessively comes off.
This device utilizes spring force and medium self pressure to carry out the gap compensation, and compensation rate and compensation rate are big, and sealability significantly improves.
The filler of pagoda type self-seal device and filler, filler and movable pressure plate are designed to wedge ring face cooperating structure, can make less pretightening force just can make the radial expansion of filler pressurized, and reach the purpose of tight seal; Indent and evagination contract type angle are respectively 90 ° and 100 °, and angulation is poor, and when receiving pretightening force, the filler amount of deformation increases like this, selfsealings more easily.
In addition, spring is as providing the member of pretightening force with compensation thrust, and extending amount is long, good rigidly, and spring deflection is little, and service time is long, can under the prerequisite that keeps the normality sealing, have long working life.
It is valve core composed that this device is particularly useful for the dress formula, because valve core composed spheroid and valve rod is an overall structure, after spheroid is stressed; Must drive valve rod departs from; Make the gap between retainer ring endoporus and the valve rod inhomogeneous, the filler radial force varies, and increases its wear extent.Adopt the pagoda type self-seal device; Can suitably strengthen between retainer ring endoporus and the valve rod, make filler that the certain clearance amount arranged, avoid taking place because of the serious phenomenon of unbalance stress uneven wear; Thereby the working life of the filler that also prolongs, the wearing and tearing that also alleviated slide bar simultaneously.
This device generally improves 1-3 doubly with compared with techniques, its life-span are arranged, and system operates steadily, and has guaranteed the safety of producing.Prolong the checking maintenance cycle of valve greatly, improved manufacturing efficiency.
The preferred embodiment that the above is merely the utility model is not the practical range that is used for limiting the utility model; If do not break away from the spirit and the scope of the utility model, the utility model is made amendment or is equal to replacement, all should be encompassed in the middle of the protection domain of the utility model claim.
Claims (7)
1. the self-seal device of a high temperature, high pressure valve comprises spring and pagoda type multi-layer annular filler, and said filler down is contained in the step hole of retainer ring and the annular groove that valve rod assembling back forms; And pass through bolton by stationary platen and locate; It is characterized in that: the bottom of pagoda type multilayer filler is provided with the movable pressure plate of circular shape, and the top of movable pressure plate is an evagination wedge ring face, and the indent wedge ring face of this evagination wedge ring face and filler fits tightly; The bottom of movable pressure plate is the plane; And be provided with the some cylindrical holes that circumferentially are uniformly distributed with, spring is installed in the cylindrical hole of movable pressure plate, and the upper end of spring is resisted against on the bottom surface of cylindrical hole; Its lower end abutment is on the end face of retainer ring step hole, and movable pressure plate bottom surface and retainer ring step hole end face have assemblage gap.
2. the self-seal device of high temperature according to claim 1, high pressure valve is characterized in that: the external diameter of said movable pressure plate is less than the external diameter of filler, and internal diameter is greater than the external diameter of filler.
3. the self-seal device of high temperature according to claim 1, high pressure valve is characterized in that: said spring is a helical spring, and its external diameter is less than the internal diameter of cylindrical hole, and free length is greater than the degree of depth of movable pressure plate cylindrical hole.
4. the self-seal device of high temperature according to claim 1, high pressure valve is characterized in that: said cylindrical hole is at least 6, and the quantity of spring is corresponding with cylindrical hole.
5. the self-seal device of high temperature according to claim 1, high pressure valve is characterized in that: the contract type angle of the evagination wedge ring face at said movable pressure plate top is 100 °.
6. the self-seal device of high temperature according to claim 1, high pressure valve is characterized in that: the contract type angle of the evagination wedge ring face at filler top is 100 °, and the contract type angle of the indent wedge ring face of bottom is 90 °.
7. the self-seal device of high temperature according to claim 1, high pressure valve is characterized in that: said movable pressure plate is to adopt high temperature resistant, corrosion resistant metallic material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220249435 CN202597885U (en) | 2012-05-30 | 2012-05-30 | Self-sealing device of high-temperature and high-pressure valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220249435 CN202597885U (en) | 2012-05-30 | 2012-05-30 | Self-sealing device of high-temperature and high-pressure valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202597885U true CN202597885U (en) | 2012-12-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220249435 Expired - Lifetime CN202597885U (en) | 2012-05-30 | 2012-05-30 | Self-sealing device of high-temperature and high-pressure valve |
Country Status (1)
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| CN (1) | CN202597885U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104110496A (en) * | 2014-04-02 | 2014-10-22 | 衢州兰玲机电科技有限公司 | Sealing structure for rotary shaft of flue gas valve |
-
2012
- 2012-05-30 CN CN 201220249435 patent/CN202597885U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104110496A (en) * | 2014-04-02 | 2014-10-22 | 衢州兰玲机电科技有限公司 | Sealing structure for rotary shaft of flue gas valve |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121212 |
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| CX01 | Expiry of patent term |