CN103759012A - Low-leakage composite forming flexible graphite padding - Google Patents
Low-leakage composite forming flexible graphite padding Download PDFInfo
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- CN103759012A CN103759012A CN201410032825.1A CN201410032825A CN103759012A CN 103759012 A CN103759012 A CN 103759012A CN 201410032825 A CN201410032825 A CN 201410032825A CN 103759012 A CN103759012 A CN 103759012A
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Abstract
The invention discloses low-leakage composite forming flexible graphite padding. By the adoption of the low-leakage composite forming flexible graphite padding, the requirement for low leakage can better be met, stable and durable deformation compensation ability is achieved, and the sealing requirement can be met under the small pressure. The low-leakage composite forming flexible graphite padding is characterized in that the section of a middle ring is hexagonal, the two peaks of the inner side of the middle ring and the two peaks of the outer side of the middle ring are connected to form a parallelogram, the upper edge and the lower edge of the parallelogram are deflected towards the inner side of the section by a small angle with the upper inner peak and the lower outer peak as the starting points and then intersect, and therefore the two upper edges and the two lower edges of the hexagonal section are formed; the end face of one end of a convex adaptive end ring is a plane, and the end face of the other end of the convex adaptive end ring is identical to the end face of the convex end of the middle ring and is matched with the end face of the concave end of the middle ring when the convex adaptive end ring is used; the end face of one end of a concave adaptive end ring is a plane, and the end face of the other end of the concave adaptive end ring is identical to the end face of the concave end of the middle ring and is matched with the end face of the convex end of the middle ring when the concave adaptive end ring is used.
Description
Technical field
The present invention relates to a kind of filler, be specifically related to the low leakage combination forming of a kind of Expanded graphite filler.
Background technique
Filler is all kinds of valves and electronic product indispensable important seal fitting, especially flexible graphite packing, because it is high temperature resistant, corrosion resistance is good, applies comparatively extensive.Conventional Expanded graphite moulding filler, cross section is square or rectangle, when being applied to the operating mode that pressure is higher, or to external leakage have very strict requirement, the product that need to meet relevant low fugacity standard-required is as on nuclear power valve time, because its radial deformation capabilities is not enough, coefficient of horizontal pressure is low, can not meet working condition requirement completely.The low leakage combined packing of the Expanded graphite ring occurring for meeting low leakage requirement, own through there being a plurality of manufacturer production both at home and abroad at present, the cross section of its moulding packing ring is generally the profiled-cross-section that shape differs, conventionally all have than the filler of conventional square or rectangular cross-section and better seal assurance ability, but due to the part that also comes with some shortcomings of the design aspect at profiled-cross-section, be therefore necessary by new structural design, the usability of low leakage combined packing ring further to be promoted.
If Fig. 1 is the current more low leakage combined packing of a kind of Expanded graphite ring of application, the low leakage combined packing of the product QUICKSET9001 ring of U.S. Garlock company of take is representative, and its central ring is parallelogram section.The Enviroflex500 of Tu2Shi U.S. Flexitallic company and the low leakage combination forming of GR160 valve stem seal filler, each of central ring and upper and lower end ring, be triangular-section.The low leakage filling-material structure of Fig. 3 also has some manufacturer production both at home and abroad.
The low leakage combined packing of above-mentioned latter two structure, there is a common deficiency: for increasing the wedge shape inclined-plane of packing ring radial deformation capabilities and coefficient of horizontal pressure, be monocline face, each inclined-plane even contact during compression, all parts of filler are compressed by equilibrium, when the internal surface of filler and adjacent parts or outer surface reach while being enough to meet the compression specific pressure of seal request, the each several part of filler inside has also had higher compressive stres, except having increased the impacting force of compression filler needs, also having overdrawed outside in filler need to be by the compensation ability that afford redress in the middle part of filler after being worn, thereby also shortened working life of filler.
Application is the structure shown in Fig. 1 more widely, it is large (as the angle of two angles of wedge of Garlock packing ring is respectively 30 ° and 45 ° that the angle of wedge angle of the angle of wedge of upper and lower two end ring and central ring differs, differ 15 °), its objective is the deformation-compensated ability when increasing follow-up need to compression again.After although filler compresses by the formed gap of this differential seat angle, for thereby the compressing again of later stage reserved the compensation ability that deformation space has increased filler, but when the compression that has caused three central rings unbalanced compresses filler, the wedge point on the top of the central ring of both sides is compressed in advance, block to a certain extent the transmission of impacting force to the central ring at middle part, caused the usefulness of the central ring at middle part not to be not fully exerted.In addition, the distortion being formed by this differential seat angle, the size of compensation space, assembled the impact of the gap length of front filler and medial and lateral part completely, when a hour deformation-compensated space, this gap can be larger, and when this gap is larger deformation-compensated space can diminish even after compressing for the first time deformation-compensated space just oneself through very little or do not exist.
Summary of the invention
In order to overcome the existing above-mentioned some shortcomings part of existing structure, the invention provides and a kind ofly can meet better low leakage requirement, have and comparatively stablize lasting deformation-compensated ability, can under less impacting force, make filler reach the low leakage combination forming of the Expanded graphite filler of seal request.
To achieve these goals, the present invention is by the following technical solutions:
The low leakage combination forming of a kind of Expanded graphite filler, it comprises the central ring that a plurality of sectional shapes are identical, the adaptive end ring of convex of one end, the adaptive end ring of spill of the other end, its major technique key is: the sectional shape of central ring is Hexagon, described hexagonal cross-section, two summits of its inner side and two summits in outside are connected to parallelogram, respectively with in two of upside, outer dead centre has been that intersect after deflection one small angle inside cross section the name a person for a particular job top of aforementioned parallelogram, form the upper both sides of hexagonal cross-section, again respectively with in two of downside, outer dead centre has been the intersecting after deflection one small angle inside cross section below of aforementioned parallelogram of naming a person for a particular job, form the lower both sides of hexagonal cross-section, the dish-shaped entity being rotarily formed with this hexagonal cross-section is central ring, to be plane, the other end identical with the nose end face of central ring and coordinate with the recessed end end face of central ring in use for one end end face of the adaptive end ring of convex, to be also plane, the other end identical with the recessed end end face of central ring and coordinate with the nose end face of central ring in use for one end end face of the adaptive end ring of spill, the global formation filler of central ring for being wound around, being molded into flexible graphite belt, the adaptive end ring of convex and the adaptive end ring of spill can be global formation filler, the knitting forming filler that also can weave, be molded into for Expanded graphite.
In order to improve the usability of above-mentioned low leakage combination forming filler, further additional following technological scheme also: when the adaptive end ring of convex and the adaptive end ring of spill adopt the global formation filler that flexible graphite belt is wound around, is molded into, respectively increase the Expanded graphite knitting forming filler of a circle square or rectangular cross-section at the upper and lower end of this low leakage combination forming filler.
In order to improve the usability of above-mentioned low leakage combination forming filler, additional following technical proposals also further in addition: the tip at the acute angle shape angle of wedge of central ring, the adaptive end ring of convex, the adaptive end ring of spill adopts fillet or straight angle transition to make described formation obtuse angle, angle of wedge tip.
The invention has the beneficial effects as follows: can make combined packing ring meet better low leakage requirement, have and comparatively stablize lasting deformation-compensated ability, can under less impacting force, make filler reach seal request.
Accompanying drawing explanation
The low leakage combined packing of the QUICKSET9001 ring structure schematic diagram of Tu1Shi U.S. Garlock company.
The low leakage combination forming of the valve stem seal filling-material structure schematic diagram of Tu2Shi U.S. Flexitallic company.
Fig. 3 is the schematic diagram of another structure of existing low leakage combination forming filler.
Fig. 4 is the structural representation of the low leakage combination forming filler that proposes of the present invention.
Fig. 5 is the partial enlarged drawing of the low leakage combination forming filler that proposes of the present invention.
Fig. 6 is the schematic diagram of the packing ring end face of the low leakage combination forming filler that proposes of the present invention.
In figure, 1, the adaptive end ring of convex; 2, central ring; 3, the adaptive end ring of spill.
Embodiment
Below in conjunction with drawings and Examples, technological scheme of the present invention is further elaborated.
As shown in Figure 4, be the concrete structure of the low leakage combination forming of a kind of Expanded graphite filler proposed by the invention, it comprises the adaptive end ring (1) of convex of the central ring that a plurality of sectional shapes are identical (2), one end, the adaptive end ring (3) of spill of the other end.Its main key problem in technology is: the sectional shape of central ring (2) is Hexagon, described hexagonal cross-section, and two summits of its inner side and two summits in outside are connected to parallelogram (seeing Fig. 5); Take respectively two inside and outside summits of upside intersects after deflection one small angle inside as the top of working the aforementioned parallelogram of naming a person for a particular job to cross section, form the upper both sides of hexagonal cross-section, take two inside and outside summits of downside respectively as work intersecting below of the aforementioned parallelogram of naming a person for a particular job after deflection one small angle inside cross section again, form the lower both sides (seeing Fig. 6) of hexagonal cross-section; The dish-shaped entity being rotarily formed with this hexagonal cross-section is central ring (2).To be plane, the other end identical with the nose end face of central ring (2) and coordinate with the recessed end end face of central ring (2) in use for one end end face of the adaptive end ring of convex (1); To be also plane, the other end identical with the recessed end end face of central ring (2) and coordinate with the nose end face of central ring (2) in use for one end end face of the adaptive end ring of spill (3).The global formation filler of central ring (2) for being wound around, being molded into flexible graphite belt; The adaptive end ring (1) of convex and the adaptive end ring of spill (3) can be wound around for flexible graphite belt the global formation filler (shown in the right figure of Fig. 4) of mold pressing, the knitting forming filler that also can weave, be molded into for Expanded graphite (shown in the left figure of Fig. 4).
In the present embodiment, the tilt angle γ of the upper and lower hypotenuse (face) of parallelogram fundamental section is by 45 °, hypotenuse is to deflection inside cross section recessed small angle α 1, α 2, β 1, β 2 all by 2.5 ° (Wedge Angle Deviation on the corresponding wedging of nose and recessed end inclined-plane is that angle of clearance is 5 °), and the nose of packing ring and recessed end end face are inside and outside two sections of different same conical surface of shafts of gradient and form.When compacted in filler is used, impacting force mainly concentrates in the inner side and outside one segment limit of position, inside and outside wedge tip and filler, wherein each position, wedge tip is maximum to the seal pressure of adjacent inside and outside part surface, thereby the position to needs sealing has formed the multi-stage sealed mechanism of action, makes this combination forming filler can realize more efficiently zero leakage effect.
Because impacting force mainly concentrates on outside one segment limit in position, wedge tip and filler, the pressure stress in filler stage casing is less, therefore not only making to compress filler, to reach the required impacting force of seal request relatively little, and in filler, stored between the follow-up spreadable life distortion and the compensation ability in the time of need to compressing again because of wearing and tearing or stress relaxation, thereby can extend the working life of filler.
In order to guarantee the usability of combination forming filler, this structure also needs to take following technological scheme: when the adaptive end ring (1) of convex and the adaptive end ring of spill (3) adopt flexible graphite belt winding, during the global formation filler that is molded into, need to respectively increase the Expanded graphite knitting forming filler of a circle square or rectangular cross-section at the upper and lower end of this low leakage combination forming filler.
Poor owing to adopting flexible graphite belt to be wound around the erosion resistibility of global formation filler of mold pressing, therefore need to increase at the upper and lower end of global formation filler the good Expanded graphite knitting forming of erosion resistibility filler.
In order to guarantee the operational safety of combination forming filler, this structure also needs to increase following technological scheme in addition: the tip at the acute angle shape angle of wedge of the adaptive end ring (1) of central ring (2), convex, the adaptive end ring of spill (3) adopts fillet or straight angle transition to make described formation obtuse angle, angle of wedge tip.
When the angle of wedge tip of packing ring is acute angle, due to the impact because of rope of technique and mould, tip tends to overlap, if overlap is brought into and is embedded in the sealing surfaces of packing ring and adjacent parts during assembling, bring impact can to undoubtedly the sealing reliability of filler.
Below by reference to the accompanying drawings the specific embodiment of the present invention is described, but these explanations can not be understood to limit scope of the present invention.Those skilled in the art should know; the present invention is not restricted to the described embodiments; its protection domain is defined by appending claims; any formed technological scheme of various changes, modification within not exceeding the scope that the claims in the present invention book defines; all do not depart from spirit of the present invention and technical spirit, within still can belonging to claim scope of the present invention.
Claims (3)
1. the low leakage combination forming of an Expanded graphite filler, it comprises the central ring that a plurality of sectional shapes are identical (2), the adaptive end ring (1) of convex of one end, the adaptive end ring (3) of spill of the other end, it is characterized in that: the sectional shape of central ring (2) is Hexagon, described hexagonal cross-section, two summits of its inner side and two summits in outside are connected to parallelogram, respectively with in two of upside, outer dead centre has been that intersect after deflection one small angle inside cross section the name a person for a particular job top of aforementioned parallelogram, form the upper both sides of hexagonal cross-section, again respectively with in two of downside, outer dead centre has been the intersecting after deflection one small angle inside cross section below of aforementioned parallelogram of naming a person for a particular job, form the lower both sides of hexagonal cross-section, the dish-shaped entity being rotarily formed with this hexagonal cross-section is central ring (2), to be plane, the other end identical with the nose end face of central ring (2) and coordinate with the recessed end end face of central ring (2) in use for one end end face of the adaptive end ring of convex (1), to be also plane, the other end identical with the recessed end end face of central ring (2) and coordinate with the nose end face of central ring (2) in use for one end end face of the adaptive end ring of spill (3), the global formation filler of central ring (2) for being wound around, being molded into flexible graphite belt, the adaptive end ring (1) of convex and spill adaptation end ring (3) can be global formation filler, the knitting forming filler that also can weave, be molded into for Expanded graphite.
2. the low leakage combination forming of Expanded graphite according to claim 1 filler, it is characterized in that: when the adaptive end ring (1) of convex and the adaptive end ring of spill (3) adopt flexible graphite belt winding, during the global formation filler that is molded into, at the upper and lower end of this low leakage combination forming filler, respectively increase the Expanded graphite knitting forming filler of a circle square or rectangular cross-section.
3. the low leakage combination forming of Expanded graphite according to claim 1 filler, is characterized in that: the tip at the acute angle shape angle of wedge of central ring (2), the adaptive end ring (1) of convex, the adaptive end ring of spill (3) adopts fillet or straight angle transition to make described formation obtuse angle, angle of wedge tip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410032825.1A CN103759012B (en) | 2014-01-23 | 2014-01-23 | A kind of low leakage combination forming filler of soft graphite |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410032825.1A CN103759012B (en) | 2014-01-23 | 2014-01-23 | A kind of low leakage combination forming filler of soft graphite |
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| Publication Number | Publication Date |
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| CN103759012A true CN103759012A (en) | 2014-04-30 |
| CN103759012B CN103759012B (en) | 2016-07-06 |
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| CN201410032825.1A Expired - Fee Related CN103759012B (en) | 2014-01-23 | 2014-01-23 | A kind of low leakage combination forming filler of soft graphite |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2303501A1 (en) * | 1973-01-25 | 1974-08-01 | Garlock Gmbh | RUBBER COMPENSATION ELEMENT FOR HYDRAULIC SLEEVES |
| GB2287772A (en) * | 1994-03-10 | 1995-09-27 | Raymond George Coughlin | Gate valve stem sealing arrangement |
| CN1214111A (en) * | 1996-03-22 | 1999-04-14 | 加洛克公司 | Compact five ring stuffing box packing assembly |
| CN2361913Y (en) * | 1999-03-24 | 2000-02-02 | 付兴孟 | Flexible graphite double-convex sealing ring |
| US6182974B1 (en) * | 1996-03-22 | 2001-02-06 | Garlock, Inc. | Stuffing box packing assembly |
| CN201531675U (en) * | 2009-09-23 | 2010-07-21 | 浙江国泰密封材料股份有限公司 | Combined packing ring used for low-leakage valve |
| CN203809690U (en) * | 2014-01-23 | 2014-09-03 | 章华 | Flexible graphite low-leakage combined molded packing |
-
2014
- 2014-01-23 CN CN201410032825.1A patent/CN103759012B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2303501A1 (en) * | 1973-01-25 | 1974-08-01 | Garlock Gmbh | RUBBER COMPENSATION ELEMENT FOR HYDRAULIC SLEEVES |
| GB2287772A (en) * | 1994-03-10 | 1995-09-27 | Raymond George Coughlin | Gate valve stem sealing arrangement |
| CN1214111A (en) * | 1996-03-22 | 1999-04-14 | 加洛克公司 | Compact five ring stuffing box packing assembly |
| US6182974B1 (en) * | 1996-03-22 | 2001-02-06 | Garlock, Inc. | Stuffing box packing assembly |
| CN2361913Y (en) * | 1999-03-24 | 2000-02-02 | 付兴孟 | Flexible graphite double-convex sealing ring |
| CN201531675U (en) * | 2009-09-23 | 2010-07-21 | 浙江国泰密封材料股份有限公司 | Combined packing ring used for low-leakage valve |
| CN203809690U (en) * | 2014-01-23 | 2014-09-03 | 章华 | Flexible graphite low-leakage combined molded packing |
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|---|---|
| CN103759012B (en) | 2016-07-06 |
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