CN203670790U - Counter-pull-type packing shaft sealing structure for reciprocating pump - Google Patents
Counter-pull-type packing shaft sealing structure for reciprocating pump Download PDFInfo
- Publication number
- CN203670790U CN203670790U CN201320667284.0U CN201320667284U CN203670790U CN 203670790 U CN203670790 U CN 203670790U CN 201320667284 U CN201320667284 U CN 201320667284U CN 203670790 U CN203670790 U CN 203670790U
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- China
- Prior art keywords
- shaft seal
- packing
- plunger
- pull
- spring
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000012856 packing Methods 0.000 title claims abstract description 84
- 238000007789 sealing Methods 0.000 title abstract description 25
- 210000004907 gland Anatomy 0.000 claims abstract description 22
- 238000009826 distribution Methods 0.000 abstract description 17
- 239000000463 material Substances 0.000 abstract description 5
- 230000008859 change Effects 0.000 abstract description 4
- 230000009977 dual effect Effects 0.000 abstract description 3
- 238000005299 abrasion Methods 0.000 abstract description 2
- 238000005086 pumping Methods 0.000 abstract 1
- 239000000945 filler Substances 0.000 description 16
- 230000007547 defect Effects 0.000 description 7
- 230000007423 decrease Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 240000003936 Plumbago auriculata Species 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009940 knitting Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Landscapes
- Sealing Devices (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
The utility model discloses a counter-pull-type packing shaft sealing structure for a reciprocating pump. The counter-pull-type packing shaft sealing structure comprises a shaft sealing box, a plunger arranged inside the shaft sealing box and a packing gland connected to the outer side of the shaft sealing box. A tensioning lantern ring is arranged between the shaft sealing box and the plunger. Packing rings are arranged between the tensioning lantern ring and the plunger. The inner-side packing ring abuts against a step at the end of the inner side of the tensioning lantern ring, the outer-side packing ring abuts against the end of the inner side of the packing gland, and the counter-pull-type structure is arranged at the end of the outer side of the tensioning lantern ring. According to the counter-pull-type packing shaft sealing structure for the reciprocating pump, the dual functions of medium pressure acting at the end of the inner side of the tensioning lantern ring and external spring pressure are utilized, and radial pressure distribution of the packing rings on the plunger tends to be similar to axial pressure distribution of the packing rings on the medium. Meanwhile, due to the fact that an external spring does not make contact with the pumping medium, conventional spring materials can be used, and spring pressure can be manually adjusted. Meanwhile, by the adoption of the counter-pull-type structure, the radial pressure of the packing rings on the plunger can automatically change along with changes of the medium pressure, and sealing pressure descending caused by abrasion of the packing rings can be automatically compensated for.
Description
Technical field
The utility model belongs to the shaft seal technical field of reciprocating pump, particularly a kind of anti-pull-type packing shaft seal structure that is applicable to mesolow reciprocating pump.
Background technique
Packing seal is a kind of traditional contact seal, because it is simple in structure, change convenient, each industrial department that is widely used in low cost, especially for the sealing of reciprocating pump plunger, is the form generally adopting both at home and abroad.Be illustrated in figure 1 conventional filler sealing configuration, because filler is elastic plastic body, when with Gland, packing ring being applied after axial pressure, filler distortion produces radial force, makes packing ring be adjacent to plunger and packing cavity inwall.
In packing seal, the leakage of pumped medium has three approach: the gap between first packing ring and packing cavity inwall, because of without relative movement, as long as radial force is not less than pressure medium, just without leaking; It two is leakages through packing ring internal voids, can be by rational method of knitting and dipping teflon+plumbago emulsion, and can eliminate by the method for compacting; It three is gaps between packing ring and plunger, because there being reciprocal relative movement, should have rational leakage rate, this be set up liquid lubrication, to take away frictional heat necessary, is the necessary condition that extends the packing ring life-span.On books and periodicals, widely popular " for guaranteeing sealing, the radial pressure that filler produces running shaft any point must be more than or equal to the pressure medium of this point " viewpoint is not only unnecessary, is also harmful to, and can accelerate the wearing and tearing of packing ring and plunger, and increase power consumption.
Mainly there is following technological deficiency in conventional filler sealing configuration:
Defect one, packing ring radial pressure distributes very unreasonable.Act on axial force F on the packing ring annular area divided by packing cavity by tightening Gland nut, be the axial pressure Px (bar) acting on packing ring, and packing ring acts on the radial pressure Pr=k × Px on plunger, wherein the coefficient of horizontal pressure k of filler is less than 1, and its value is relevant with pressure medium with packing ring properties of materials used.As shown in Figure 2, the radial pressure Pr of packing ring to plunger being produced by the nut of tightening Gland and the distribution of pressure medium P1 be all parabolically or logarithmic curve rule change along plunger axial direction, the distribution of radial pressure Pr is to be successively decreased gradually by inner side, lateral, the distribution of pressure medium P1 is that inner side is the highest, outwards successively decrease from inner, the distribution of these two kinds of pressure is just the opposite, the pressure medium P1 maximum of packing cavity bottom, but packing ring is minimum to the radial pressure Pr of plunger, the greatest drawback of conventional filler that Here it is sealing.
Defect two, for reducing the leakage of shaft seal, often wants overtighten Gland, thereby has accelerated the wearing and tearing of outside packing ring and plunger, and its operating life is shortened.
For overcoming the defect of conventional filler sealing, occur that the two Stuffing boxes of tandem and packing cavity inner side add the structure of spring.
If the sealing of high pressure reciprocating pump plunger adopts the two Stuffing boxes of tandem, although contribute to compress the filler of medial segment, but the packing ring number of turns needing because of high pressure reciprocating pump is many, from outside, packing ring is pressurizeed, when pressure passes to inner side packing ring, decayed, therefore, two Stuffing box structures are limited to improving the effect of the radial pressure irrational distribution defect of conventional filler ring to plunger, and long because of Stuffing box axial dimension, cause accuracy of manufacturing to require high, manufacture cost rises.
If employing all adds the structure of built-in spring in packing cavity outside and inner side, still there are two kinds of large defects that pressure distribution is just the opposite in conventional filler sealing in the mode that outside adds spring.And add the structure of spring in packing cavity inner side, it is the large defect of from outside, packing ring being pressurizeed principle in order to overcome conventional filler sealing configuration, contribute to compress the filler of inner side, but in the time that packing ring has wearing and tearing to make its size decreases, the axial pressure of built-in spring will reduce thereupon, in structure, cannot regulate again.And be immersed in the corrosion that spring selection in pumped medium should be able to resistance to pumped medium, and there is again the required high strength of spring, the spring material that has these two kinds of requirements concurrently is difficult for obtaining.Therefore, it is also undesirable in industrial practical application that packing cavity outside and inner side all add the structure of built-in spring, is only used in pumped medium corrosivity not strong, or the not high occasion of working pressure.
If only fill built-in spring in packing cavity inner side, the Gland in outside and shaft seal case end face are adjacent to, and it can not regulate with Gland the compression degree of packing ring.Also there is above-mentioned defect in this shaft seal structure, because the packing ring number of turns is few, it is not strong that this shaft seal structure is also only used in pumped medium corrosivity, the occasion that working pressure is not high.
Model utility content
Goal of the invention of the present utility model is: for the problem of above-mentioned existence, provide a kind of packing ring that can make that the sealing radial force of plunger is distributed and reached unanimity with the distribution of pumped medium pressure, and packing ring anti-pull-type packing shaft seal structure that the sealing radial force of plunger is regulated automatically with the variation of pressure medium inside shaft seal case.
The technical solution of the utility model is achieved in that the anti-pull-type packing shaft seal structure for reciprocating pump, it is characterized in that: comprise shaft seal case, be placed in the plunger in shaft seal case and be connected to the Gland in shaft seal case outside, between described shaft seal case and plunger, be provided with the tension collar, between the described tension collar and plunger, be provided with packing ring, the packing ring of inner side is resisted against tension collar inner end step place, the packing ring in outside is resisted against Gland inner end, thereby described tension collar outboard end be provided with for by the tension collar along its axially tension laterally by pressure-acting at the anti-pulling structure on the packing ring of inner side of shaft seal case.
Anti-pull-type packing shaft seal structure for reciprocating pump described in the utility model, described in it, anti-pulling structure comprises that being arranged at least three of tension collar outboard end is axially evenly arranged in the double-screw bolt on same circumference along it, described double-screw bolt passes and in part, is socketed with spring through Gland and at double-screw bolt, described spring one end is resisted against the exterior edge face of Gland, its the other end is resisted against the spring shield inner side being enclosed within on double-screw bolt, on described double-screw bolt, the arranged outside of spring shield has nut, described spring is in compressive state.
Anti-pull-type packing shaft seal structure for reciprocating pump described in the utility model, strains between the inside and outside end of the collar and shaft seal case described in it and is respectively arranged with O-ring seals.
Anti-pull-type packing shaft seal structure for reciprocating pump described in the utility model, it is provided with lantern ring between the described tension collar and plunger, on shaft seal case corresponding to described lantern ring, be provided with through hole, the shaft seal box cavity of described through hole end is set to circular groove, on the described tension collar, be provided with the hole of connection corresponding to lantern ring, be provided with uniformly some radial holes at described lantern ring middle part.
The utility model has utilized and has acted on the pressure medium of tension collar inner end and the dual functions of external spring pressure, make the distribution of the radial pressure of packing ring to plunger close with medium pressure distribution trend vertically, and because external spring does not contact pumped medium, available conventional spring material, and spring pressure can manual tune, efficiently solve the problem that existing built-in spring structure exists.And, adopt anti-pulling structure can make packing ring automatically change with pressure medium the radial pressure of plunger, and energy auto-compensation is because of the sealing load decline of packing ring abrasion appearance, without will manually regularly tightening Gland as conventional fillers structure.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of conventional filler sealing configuration.
Fig. 2 is the radial pressure Pr of packing ring to plunger and the distribution map of pressure medium P1 in conventional filler sealing configuration.
Fig. 3 is structural representation of the present utility model.
Fig. 4 is the radial pressure Pr of packing ring to plunger and the distribution map of pressure medium P1 in the utility model.
Mark in figure: 1 is shaft seal case, 2 is plunger, and 3 is Gland, and 4 is the tension collar, and 5 is packing ring, and 6 is double-screw bolt, and 7 is spring, and 8 is spring shield, and 9 is nut, and 10 is O-ring seals, and 11 is lantern ring, and 12 is through hole, and 13 is circular groove, and 14 is radial hole.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in detail.
In order to make the purpose of this utility model, technological scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
As shown in Figure 3, a kind of anti-pull-type packing shaft seal structure for reciprocating pump, comprise shaft seal case 1, be placed in the plunger 2 in shaft seal case 1 and be connected to the Gland 3 in shaft seal case 1 outside, between described shaft seal case 1 and plunger 2, be provided with the tension collar 4, between the inside and outside end of the described tension collar 4 and shaft seal case 1, be respectively arranged with O-ring seals 10, prevent that the pumped medium of shaft seal case bottom from occurring leaking outside from the gap between the tension collar and shaft seal case endoporus; Between the described tension collar 4 and plunger 2, be provided with packing ring 5, the packing ring 5 of inner side is resisted against the tension collar 4 inner end step places, the packing ring 5 in outside is resisted against Gland 3 inner ends, thus the described tension collar 4 outboard end be provided with for by the tension collar 4 along its axially tension laterally by pressure-acting at the anti-pulling structure on the packing ring 5 of inner side of shaft seal case 1; Described anti-pulling structure comprises that being arranged on four of the tension collar 4 outboard end is axially evenly arranged in the double-screw bolt 6 on same circumference along it, described double-screw bolt 6 passes and in part, is socketed with spring 7 through Gland 3 and at double-screw bolt 6, described spring 7 one end are resisted against the exterior edge face of Gland 3, its the other end is resisted against spring shield 8 inner sides that are enclosed within on double-screw bolt 6, on described double-screw bolt 6, the arranged outside of spring shield 8 has nut 9, described spring 7 is in compressive state.
Wherein, because the working pressure of segmentum laterale reduces, between the described tension collar 4 and plunger 2, the middle part of packing ring is provided with lantern ring 11, on the shaft seal case 1 of described lantern ring 11 correspondences, be provided with through hole 12, both can be used as the outer import for sealing fluid, also can draw thus pump work medium and return the low-voltage equipment of pump inlet side; Shaft seal case 1 inner chamber of described through hole 12 ends is set to circular groove 13, on the described tension collar 4, be provided with the hole of connection corresponding to lantern ring 11, be provided with uniformly some radial holes 14 at described lantern ring 11 middle parts, to can evenly enter lantern ring for sealing fluid on circumference adding from adapter, more evenly enter the periphery of plunger through uniform radial hole on lantern ring.
The utility model is by the packing ring tension to shaft seal case bottom from outside of the tension collar, utilization acts on the pressure medium of tension collar inner side and the dual functions of four compressed spring pressures, realize the distribution of the radial pressure of packing ring to plunger and the distribution of pumped medium pressure and be tending towards close, and because external spring does not contact pumped medium, available conventional spring material, and spring pressure can manual tune, efficiently solve the problem that existing built-in spring structure exists.
From the regularity of distribution of Pr and the P1 of Fig. 4, along plunger axial direction, packing ring is the highest in inner side to the radial pressure Pr of plunger, outwards successively decrease from inner, the regularity of distribution of this and pressure medium P1 is close, thereby overcome the significant deficiency of existing packing shaft seal structure, significantly reduced the leakage quantity that leaks of washing solution, extended the life-span of packing ring and plunger.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection domain of the present utility model.
Claims (4)
1. for the anti-pull-type packing shaft seal structure of reciprocating pump, it is characterized in that: comprise shaft seal case (1), be placed in the plunger (2) in shaft seal case (1) and be connected to the Gland (3) in shaft seal case (1) outside, between described shaft seal case (1) and plunger (2), be provided with the tension collar (4), between the described tension collar (4) and plunger (2), be provided with packing ring (5), the packing ring (5) of inner side is resisted against the tension collar (4) inner end step place, the packing ring (5) in outside is resisted against Gland (3) inner end, the described tension collar (4) outboard end be provided with for straining the collar (4) thus along its axially tension laterally by pressure-acting at the anti-pulling structure on inner side packing ring (5) of shaft seal case (1).
2. the anti-pull-type packing shaft seal structure for reciprocating pump according to claim 1, it is characterized in that: described anti-pulling structure comprises that being arranged at least three of the tension collar (4) outboard end is axially evenly arranged in the double-screw bolt (6) on same circumference along it, described double-screw bolt (6) passes and in part, is socketed with spring (7) through Gland (3) and at double-screw bolt (6), described spring (7) one end is resisted against the exterior edge face of Gland (3), its the other end is resisted against spring shield (8) inner side being enclosed within on double-screw bolt (6), on described double-screw bolt (6), the arranged outside of spring shield (8) has nut (9), described spring (7) is in compressive state.
3. the anti-pull-type packing shaft seal structure for reciprocating pump according to claim 2, is characterized in that: between the inside and outside end of the described tension collar (4) and shaft seal case (1), be respectively arranged with O-ring seals (10).
4. according to the anti-pull-type packing shaft seal structure for reciprocating pump described in claim 1,2 or 3, it is characterized in that: between the described tension collar (4) and plunger (2), be provided with lantern ring (11), on shaft seal case (1) corresponding to described lantern ring (11), be provided with through hole (12), shaft seal case (1) inner chamber of described through hole (12) end is set to circular groove (13), on the described tension collar (4), be provided with and the hole of the corresponding connection of lantern ring (11), be provided with uniformly some radial holes (14) at described lantern ring (11) middle part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320667284.0U CN203670790U (en) | 2013-10-28 | 2013-10-28 | Counter-pull-type packing shaft sealing structure for reciprocating pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320667284.0U CN203670790U (en) | 2013-10-28 | 2013-10-28 | Counter-pull-type packing shaft sealing structure for reciprocating pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203670790U true CN203670790U (en) | 2014-06-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320667284.0U Expired - Lifetime CN203670790U (en) | 2013-10-28 | 2013-10-28 | Counter-pull-type packing shaft sealing structure for reciprocating pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203670790U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105134955A (en) * | 2015-09-17 | 2015-12-09 | 浙江长城减速机有限公司 | Kettle packing sealing device with sealing cavity |
| CN105952606A (en) * | 2015-11-18 | 2016-09-21 | 天津内燃机研究所（天津摩托车技术中心） | Anti-backflow pneumatic supplying pump suitable for vacuum environment |
| CN105952608A (en) * | 2015-11-23 | 2016-09-21 | 天津内燃机研究所（天津摩托车技术中心） | High precision multichannel fluid rationing device for rapid production |
-
2013
- 2013-10-28 CN CN201320667284.0U patent/CN203670790U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105134955A (en) * | 2015-09-17 | 2015-12-09 | 浙江长城减速机有限公司 | Kettle packing sealing device with sealing cavity |
| CN105952606A (en) * | 2015-11-18 | 2016-09-21 | 天津内燃机研究所（天津摩托车技术中心） | Anti-backflow pneumatic supplying pump suitable for vacuum environment |
| CN105952608A (en) * | 2015-11-23 | 2016-09-21 | 天津内燃机研究所（天津摩托车技术中心） | High precision multichannel fluid rationing device for rapid production |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140625 |