GB2066906A - Stuffing boxes - Google Patents
Stuffing boxes Download PDFInfo
- Publication number
- GB2066906A GB2066906A GB8036975A GB8036975A GB2066906A GB 2066906 A GB2066906 A GB 2066906A GB 8036975 A GB8036975 A GB 8036975A GB 8036975 A GB8036975 A GB 8036975A GB 2066906 A GB2066906 A GB 2066906A
- Authority
- GB
- United Kingdom
- Prior art keywords
- packing box
- packing
- box gland
- gland
- arrangement
- 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.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/18—Sealings between relatively-moving surfaces with stuffing-boxes for elastic or plastic packings
- F16J15/184—Tightening mechanisms
- F16J15/185—Tightening mechanisms with continuous adjustment of the compression of the packing
- F16J15/186—Tightening mechanisms with continuous adjustment of the compression of the packing using springs
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Valves (AREA)
Abstract
In a stuffing box arrangement, to provide for automatic resetting of the packing (4), spring elements (11) are interpositioned between screw nuts (10), and the stuffing box gland (6). <IMAGE>
Description
SPECIFICATION
A packing box arrangement
The present invention refers to an adjustable packing box arrangement for sealing movable machine parts, particularly rotating shafts, within a through-passage, a packer being pressed in axial direction of the through-passage by a packing box gland, the packing box gland embracing threaded bolts inserted into the constructional part comprising the through-passage and the packing box gland being tensioned by screw nuts screwed onto said threaded bolts. In known packing box arrangements of the mentioned type, the packing box becomes untight during operation and leakage losses are occurrying so that such packing box arrangements need frequent servicing. Such frequent servicing is particularly required after interruption of operation and on account of fluctuations of temperature or pressure.When using packing boxes for rotating shafts, the packing of the packing box is severely stressed with shafts having a concentricity error.
It is now an object of the present invention to avoid these drawbacks and to prolong the servicing intervals with packing boxes. The present invention now essentially consists in that spring elements are interpositioned between the screw nuts and the packing box gland, said spring elements preferably being formed of stacked cup springs or helical springs known per se. The CH-PS 575088 describes a packing box arrangement in which the packing of the packing box is adjustable under the action of spring pressure. In this known arrangement, the packing box is inserted into a tubular machine part and an annular housing is connected with the packing box gland, said annular housing being put over the tubular machine part and being supported against this tubular machine part with interposition of spring elements.Such a construction is, on the one hand, very expensive and, on the other hand only practicable if the packing of the packing box is arranged within a tubular machine part. In cases in which the packing box gland shall be forced against a plane surface, such a construction is not possible and a usual packing box arrangement can not be replaced by such a packing box arrangement. In view of the spring elements being, according to the invention, arranged between the screw nuts and the packing box gland, each usual packing box arrangement can be made resiliently adjustable without requiring any change of the construction.Such a resiliently adjustable packing box arrangement has the advantage that the pressure acting on the packing of the packing box can be maintained over an extended time of operation without requiring frequent servicing, thereby substantially prolonging the servicing intervals. Furthermore, an optimum pressure acting on the packing of the packing box can be adjusted in view of the packing box gland being resiliently pressed against the packing of the packing box, thereby also avoiding any injury of the packing of the packing box by excessive compression. In an arrangement according to the invention, the resetting path of the packing box gland can be given any desired length. The resetting path can have, if desired, such a length that the packing of the packing box can be used till complete wear without any resetting operation.The wear of the packing is, of course, greater for packing boxes used for tightly sealing rotating shafts, because the packing box is subjected to heavier stress with a concentricity error of the shaft than is the case when sealing reciprocating constructional parts such as, for example, piston rods.
According to the invention, the threaded bolts are smooth and not provided with a thread at the area embraced by the packing box gland so that the packing box gland is guided without any restraint and the free adjustment movement of the packing box gland is not obstructed by contact with threads.
Tests have shown that a packing box arrangement according to the invention is suitable for extending under normal operating conditions the servicing intervals up to approximately 8000 operational hours.
The invention is further illustrated with reference to the drawing schematically showing embodiments of the invention.
Figures 1 and 2 show axial sections through packing box arrangements according to the invention.
In the arrangements according to Figures 1 and 2, reference numeral 1 is a shaft or a reciprocating rod, for example a piston rod, which is to be tightly sealed within a constructional part 3 comprising a through-passage 2. Reference numeral 4 designates the packing of the packing box, said packing consisting of rings 5 of sealing material, which rings are stacked one on the other in axial direction. Reference numeral 6 designates the packing box gland which is in usual manner provided with a laterally extending flange 7 provided with bores 8 through which threaded bolts 9 are extending which are screwed into the constructional part 3 comprising the through-passage 2. The packing box gland is pressed against the packing 4 of the packing box by screw nuts 10.
In known packing box arrangements, the nuts 10 are immediately supported against the flange 7.
Whenever the packing 4 of the packing box becomes untight the nuts 10 must be tightened. Such servicing operations are required after comparatively short time intervals.
In the arrangement according to the invention, spring elements 11 are interpositioned between the nuts 10 and the flange 7, said spring elements being helical springs 12 in the arrangement according to Figure 1 and stacked cup springs 13 in the arrangement according to Figure 2. These spring elements 11 are continuously resetting the packing box gland and thus are maintaining the required pressure force which has to act on the packing 4 of the packing box.
The threaded bolts 9 are smooth and not provided with any thread at the area 14 embraced by the packing box gland 6, i.e. at the area of the bore 8, thereby avoiding the danger that the packing box gland becomes catched by threads thus making the spring element 11 inoperable. The spring elements 11 are arranged between supporting discs 15 so that the spring elements are unobjectionably supported and the pressure force can precisely be adjusted. The length of the packing 4 of the packing box is designated a.
In the drawing, the pressure acting on the packing is designated p, the spring force is designated F and the annular cross section of the packing is designated A.
The criteria of both types of springs are
(a) the fluid pressure acting on the packing,
(b) the available spring path depending on the type of packing (dependent on whether the packing is made of soft material or of hard material or is made up of a different number of packing rings),
(c) the constructional facts (packing box length) and
(d) pressure fluctuations during operation.
The spring sizes are calculated according to the following formula: N
p ( 2) = maximum pressure acting on the packing of the
cm packing box A (cm2) = area of the annular cross section of the packing
A =
4
F (N) = required spring force
F P A < F=p.A The calculated spring force is divided by the number of threaded bolts provided in the packing box, thus obtaining the spring force for one single spring and its specific size.
Claims (3)
1. Adjustable packing box arrangement for sealing movable machine parts, particularly rotating shafts, within a through-passage, a packer being pressed in axial direction of the screw-passages by a packing box gland, the packing box gland embracing threaded bolts inserted into the constructional part comprising the through-passage and the packing box gland being tensioned by screw nuts screwed onto said bolts, wherein spring elements are interpositioned between the screw nuts and the packing box gland, said spring elements preferably being formed of stacked cup springs or helical springs.
2. Packing box arrangement as claimed in claim 1, wherein the threaded bolts are smooth and without thread within their area embraced by the packing box gland.
3. Adjustable packing box arrangement for sealing movable machine parts constructed, arranged and adapted to operate substantially as herein described with reference to, and as shown in, the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT0743079A AT364211B (en) | 1979-11-22 | 1979-11-22 | ADJUSTABLE GAUGE ARRANGEMENT |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2066906A true GB2066906A (en) | 1981-07-15 |
Family
ID=3595977
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8036975A Withdrawn GB2066906A (en) | 1979-11-22 | 1980-11-18 | Stuffing boxes |
Country Status (2)
| Country | Link |
|---|---|
| AT (1) | AT364211B (en) |
| GB (1) | GB2066906A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4795171A (en) * | 1986-09-02 | 1989-01-03 | Federico Quevedo Del Rio | Self-pressurized shaft or closure seal |
| GB2208911A (en) * | 1987-08-19 | 1989-04-19 | Triten Corp | Plug valve |
| ES2124646A1 (en) * | 1995-05-03 | 1999-02-01 | Bach S A V | Improved valve |
| WO2001007804A1 (en) * | 1999-07-23 | 2001-02-01 | Loy Yang Power Management Pty Ltd | Packing gland assembly for sootblowers |
| WO2004065834A1 (en) * | 2003-01-22 | 2004-08-05 | Vincenzo Varriale | A stuffing seal |
| WO2004072526A1 (en) * | 2003-02-07 | 2004-08-26 | Fisher Controls International Llc | Bushing-less stem guided control valve |
| US20110192791A1 (en) * | 2007-03-20 | 2011-08-11 | Jun Yang | Method and device for biogenic waste treatment |
| CN102305292A (en) * | 2011-06-10 | 2012-01-04 | 张家港市兰航机械有限公司 | Shaft sealing device |
| CN110725953A (en) * | 2019-10-28 | 2020-01-24 | 江西中烟工业有限责任公司 | Combined sealing element for hot melt adhesive gun of filter rod forming machine |
-
1979
- 1979-11-22 AT AT0743079A patent/AT364211B/en not_active IP Right Cessation
-
1980
- 1980-11-18 GB GB8036975A patent/GB2066906A/en not_active Withdrawn
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4795171A (en) * | 1986-09-02 | 1989-01-03 | Federico Quevedo Del Rio | Self-pressurized shaft or closure seal |
| GB2208911A (en) * | 1987-08-19 | 1989-04-19 | Triten Corp | Plug valve |
| US4827967A (en) * | 1987-08-19 | 1989-05-09 | Triten Corporation | Plug valve |
| GB2208911B (en) * | 1987-08-19 | 1991-04-17 | Triten Corp | Plug valve |
| ES2124646A1 (en) * | 1995-05-03 | 1999-02-01 | Bach S A V | Improved valve |
| WO2001007804A1 (en) * | 1999-07-23 | 2001-02-01 | Loy Yang Power Management Pty Ltd | Packing gland assembly for sootblowers |
| WO2004065834A1 (en) * | 2003-01-22 | 2004-08-05 | Vincenzo Varriale | A stuffing seal |
| WO2004072526A1 (en) * | 2003-02-07 | 2004-08-26 | Fisher Controls International Llc | Bushing-less stem guided control valve |
| US6866244B2 (en) | 2003-02-07 | 2005-03-15 | Fisher Controls International Llc | Bushing-less control valve |
| US20110192791A1 (en) * | 2007-03-20 | 2011-08-11 | Jun Yang | Method and device for biogenic waste treatment |
| US8535526B2 (en) * | 2007-03-20 | 2013-09-17 | Jun Yang | Method and device for biogenic waste treatment |
| CN102305292A (en) * | 2011-06-10 | 2012-01-04 | 张家港市兰航机械有限公司 | Shaft sealing device |
| CN110725953A (en) * | 2019-10-28 | 2020-01-24 | 江西中烟工业有限责任公司 | Combined sealing element for hot melt adhesive gun of filter rod forming machine |
Also Published As
| Publication number | Publication date |
|---|---|
| ATA743079A (en) | 1981-02-15 |
| AT364211B (en) | 1981-10-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |