CN203570569U - Super charger piston type packing shaft seal structure for reciprocating pump - Google Patents
Super charger piston type packing shaft seal structure for reciprocating pump Download PDFInfo
- Publication number
- CN203570569U CN203570569U CN201320667477.6U CN201320667477U CN203570569U CN 203570569 U CN203570569 U CN 203570569U CN 201320667477 U CN201320667477 U CN 201320667477U CN 203570569 U CN203570569 U CN 203570569U
- Authority
- CN
- China
- Prior art keywords
- shaft seal
- packing
- plunger
- packing ring
- reciprocating pump
- Prior art date
- 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 87
- 210000004907 gland Anatomy 0.000 claims abstract description 15
- 239000000945 filler Substances 0.000 claims description 21
- 238000007789 sealing Methods 0.000 abstract description 19
- 238000009826 distribution Methods 0.000 abstract description 16
- 238000005299 abrasion Methods 0.000 abstract description 3
- 238000005086 pumping Methods 0.000 abstract 1
- 230000007547 defect Effects 0.000 description 7
- 230000008859 change Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 230000007812 deficiency Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000007906 compression Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 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
- 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
- Details Of Reciprocating Pumps (AREA)
Abstract
The utility model discloses a super charger piston type packing shaft seal structure for a reciprocating pump. The super charger piston type packing shaft seal structure comprises a shaft seal box which is fixedly connected to a reciprocating pump body and a plunger which penetrates through the pump body to be arranged inside the shaft seal box. A packing ring is arranged between the shaft seal box and the plunger, a packing gland is arranged on the outer side of the shaft seal box, and a super charger piston is arranged inside the shaft seal box. One side, close to medium pressure, of the super charger piston is provided with a big end face, and the other side of the super charger piston is provided with a small end face and abuts against the packing ring on the inner side. By means of the super charger piston type packing shaft seal structure for the reciprocating pump, medium pressure acts on the packing ring on the innermost portion of the shaft seal box, the distribution of the sealing radial force of the packing ring to the plunger should tend to be the same as the distribution of the pumping medium pressure in the axial direction of the plunger, excessively fast abrasion of the outer side packing ring and the plunger is avoided, and the reliability of a shaft seal is improved; moreover, by the adoption of the super charger piston, the radial pressure of the packing ring to the plunger can be changed automatically along with the medium pressure, and there is no need for manual work to regularly screw down the packing gland like a conventional packing structure.
Description
Technical field
The utility model belongs to the shaft seal technical field of reciprocating pump, particularly a kind of charged piston 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.By tightening Gland nut, act on axial force F on the packing ring annular area divided by packing cavity, 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 along plunger axial direction, change, 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, from inner, outwards successively decrease, 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, occurred 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 in packing cavity inner side, add the structure of spring, 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 when 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 charged piston 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 charged piston packing shaft seal structure for reciprocating pump, it is characterized in that: comprise the shaft seal case being fixedly connected on the reciprocating pump pump housing and be placed in the plunger in shaft seal case through the pump housing, between described shaft seal case and plunger, be provided with packing ring, arranged outside at shaft seal case has Gland, in described shaft seal case, be provided with charged piston, described charged piston is large end face near pressure medium one side, its opposite side be small end face and with the packing ring of inner side against.
Charged piston packing shaft seal structure for reciprocating pump described in the utility model, described in it, the ratio of the large and small end area of charged piston is less than 1/k, the coefficient of horizontal pressure that k is filler.
Charged piston packing shaft seal structure for reciprocating pump described in the utility model, between its large and small end at described charged piston and shaft seal chamber interior wall, be respectively arranged with O-ring seals, on described shaft seal case, between two O-ring seals, be provided with open to atmosphere telltale hole.
Charged piston packing shaft seal structure for reciprocating pump described in the utility model, it is provided with lantern ring between described shaft seal case 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, at described lantern ring middle part, is provided with uniformly some radial holes.
The utility model arranges charged piston in shaft seal case bottom, utilize the function of increasing pressure of charged piston, pressure medium is acted on the inner most packing ring of shaft seal case, realized the axial direction along plunger, packing ring distributes and should reach unanimity with the distribution of pumped medium pressure the sealing radial force of plunger, thereby overcome in existing external-compression type packing shaft seal structure, the significant deficiency that packing ring is just the opposite with the distribution of pressure medium to the radial pressure distribution of plunger, avoid the quick-wearing of crossing of outside packing ring and plunger, and improved the reliability of shaft seal.And, adopt charged piston can make packing ring automatically with pressure medium, change 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 the pump housing, 2 is shaft seal case, and 3 is plunger, and 4 is packing ring, and 5 is Gland, and 6 is charged piston, and 7 is O-ring seals, and 8 is open to atmosphere telltale hole, and 9 is lantern ring, and 10 is through hole, and 11 is circular groove, 12 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 charged piston packing shaft seal structure for reciprocating pump, comprise and be bolted to connection the case of the shaft seal on the reciprocating pump pump housing 12 and be placed in the plunger 3 in shaft seal case 2 through the pump housing 1, between described shaft seal case 2 and plunger 3, be provided with packing ring 4, in the arranged outside of shaft seal case 2, there is Gland 5, in described shaft seal case 2, be provided with charged piston 6, described charged piston 6 is large end face near pressure medium one side, its opposite side be small end face and with the packing ring 4 of inner side against.
Wherein, the axial force F 1 that acts on charged piston left end equals pressure medium P1, and to be multiplied by piston large end face long-pending: F1=P1 × π/4(D1
2-d1
2), wherein, D1 is the large end end face of charged piston external diameter, and D2 is charged piston small end end face external diameter, and d1 is charged piston diameter of bore.The axial force that this power passes to charged piston right-hand member is also F1, but axial force in packing ring unit area is enlarged into (D1
2-d1
2)/(D2
2-d1
2) doubly, if this multiple equals the inverse of filler coefficient of horizontal pressure k, the radial pressure Pr that packing ring acts on plunger just equals pressure medium P1.But, by packing ring, to the radial pressure Pr of plunger, should be less than the pressure medium P1 of this place, to there is the principle of rational dielectric leakage amount, the ratio of the large and small end area of charged piston should be less than 1/k, the coefficient of horizontal pressure that wherein k is filler, its value is relevant with pressure medium with packing ring properties of materials used.
Wherein, between the large and small end of described charged piston 6 and shaft seal case 2 inwalls, be respectively arranged with O-ring seals 7, to prevent that medium from draining in the cavity in outside of the large end of piston, the pressure enlarging function of charged piston was lost efficacy, on described shaft seal case 2, between two O-ring seals 7, be provided with open to atmosphere telltale hole 8, in order to the sealing that judges these two O shapes circles, whether have leakage.
Between described shaft seal case 2 and plunger 3, be provided with lantern ring 9, on the shaft seal case 2 of described lantern ring 9 correspondences, be provided with through hole 10, 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 2 inner chambers of described through hole 10 ends are set to circular groove 11, at described lantern ring 9 middle parts, be provided with uniformly some radial holes 12, to can evenly enter lantern ring for sealing fluid on circumference adding from adapter, then through uniform radial hole on lantern ring, evenly enter the periphery of plunger.
When the plunger of reciprocating pump moves reciprocatingly, the pressure medium fluctuating range of shaft seal case bottom is very large, adopts charged piston just can make packing ring automatically change with pressure medium P1 the radial pressure Pr of plunger.In addition, when packing ring has abrasion, pressure medium acts on charged piston all the time, without will manually regularly tightening Gland as conventional fillers shaft seal structure.When the Gland of shaft seal case outside dress is used for first dress packing ring and lantern ring, guarantee to regulate the axial position of packing ring and lantern ring correct.
From the regularity of distribution of Pr and the P1 of Fig. 4, along plunger axial direction, the packing ring that charged piston produces is the highest in inner side to the radial pressure Pr of plunger, from inner, outwards successively decrease, 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 charged piston packing shaft seal structure of reciprocating pump, it is characterized in that: comprise the shaft seal case (2) being fixedly connected on the reciprocating pump pump housing (1) and be placed in the plunger (3) in shaft seal case (2) through the pump housing (1), between described shaft seal case (2) and plunger (3), be provided with packing ring (4), in the arranged outside of shaft seal case (2), there is Gland (5), in described shaft seal case (2), be provided with charged piston (6), described charged piston (6) is large end face near pressure medium one side, its opposite side be small end face and with the packing ring (4) of inner side against.
2. the charged piston packing shaft seal structure for reciprocating pump according to claim 1, is characterized in that: the ratio of the large and small end area of described charged piston (6) is less than 1/k, the coefficient of horizontal pressure that k is filler.
3. the charged piston packing shaft seal structure for reciprocating pump according to claim 1 and 2, it is characterized in that: between the large and small end of described charged piston (6) and shaft seal case (2) inwall, be respectively arranged with O-ring seals (7), between, two O-ring seals (7) upper at described shaft seal case (2), be provided with open to atmosphere telltale hole (8).
4. the charged piston packing shaft seal structure for reciprocating pump according to claim 3, it is characterized in that: between described shaft seal case (2) and plunger (3), be provided with lantern ring (9), on shaft seal case (2) corresponding to described lantern ring (9), be provided with through hole (10), shaft seal case (2) inner chamber of described through hole (10) end is set to circular groove (11), at described lantern ring (9) middle part, is provided with uniformly some radial holes (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320667477.6U CN203570569U (en) | 2013-10-28 | 2013-10-28 | Super charger piston type packing shaft seal structure for reciprocating pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320667477.6U CN203570569U (en) | 2013-10-28 | 2013-10-28 | Super charger piston type packing shaft seal structure for reciprocating pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203570569U true CN203570569U (en) | 2014-04-30 |
Family
ID=50538302
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320667477.6U Expired - Lifetime CN203570569U (en) | 2013-10-28 | 2013-10-28 | Super charger piston type packing shaft seal structure for reciprocating pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203570569U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108119354A (en) * | 2018-02-26 | 2018-06-05 | 克拉玛依胜利高原机械有限公司 | Glue injection type plunger pump gland packing box |
| CN110469714A (en) * | 2019-09-01 | 2019-11-19 | 永嘉企达知识产权咨询有限公司 | A kind of on-line maintenance gate valve |
-
2013
- 2013-10-28 CN CN201320667477.6U patent/CN203570569U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108119354A (en) * | 2018-02-26 | 2018-06-05 | 克拉玛依胜利高原机械有限公司 | Glue injection type plunger pump gland packing box |
| CN110469714A (en) * | 2019-09-01 | 2019-11-19 | 永嘉企达知识产权咨询有限公司 | A kind of on-line maintenance gate valve |
| CN110469714B (en) * | 2019-09-01 | 2020-12-01 | 浙江慧博阀门科技有限公司 | Online maintenance gate valve |
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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: 20140430 |