CA1116200A - Stuffing box and support therefor - Google Patents
Stuffing box and support thereforInfo
- Publication number
- CA1116200A CA1116200A CA349,010A CA349010A CA1116200A CA 1116200 A CA1116200 A CA 1116200A CA 349010 A CA349010 A CA 349010A CA 1116200 A CA1116200 A CA 1116200A
- Authority
- CA
- Canada
- Prior art keywords
- stuffing box
- recess
- ring
- piston rod
- lowermost
- 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
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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K41/00—Spindle sealings
- F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
-
- 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
- F16J15/24—Sealings between relatively-moving surfaces with stuffing-boxes for elastic or plastic packings with radially or tangentially compressed packing
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Devices (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
In a cone stuffing box for use on pumps of various kinds, particularly an oil well pump, there is described an annular sup-port member to prevent the deformation and consequent malfunction of the split rubber cones used to seal the polish rod reciprocat-ing through the stuffing box. In this invention, the support member comprises a rigid annular ring which is inserted into a recess formed into the bottom of the lowermost conical sealing member. The support member is formed with a bore hole to closely receive the piston rod. An upper surface of the ring engages and supports a surface of the recess and a lower surface of the ring is supported by the stuffing box housing. The support member re-inforces the conical seal and prevents the deformation thereof.
In a cone stuffing box for use on pumps of various kinds, particularly an oil well pump, there is described an annular sup-port member to prevent the deformation and consequent malfunction of the split rubber cones used to seal the polish rod reciprocat-ing through the stuffing box. In this invention, the support member comprises a rigid annular ring which is inserted into a recess formed into the bottom of the lowermost conical sealing member. The support member is formed with a bore hole to closely receive the piston rod. An upper surface of the ring engages and supports a surface of the recess and a lower surface of the ring is supported by the stuffing box housing. The support member re-inforces the conical seal and prevents the deformation thereof.
Description
This invention relates to a support member for use with split rubber or ~raphite cones used in cone stuffing boxes and more particularly -to a support disc which might be inserted into the hollowed out portion of a heavy split bot-tom cone.
Stuffing boxes are ordinarily used to seal a valve stem at its point of entry into a valve body to prevent leakage of fluid from the valve. A stuffing box -typically comprises a cylin-drical recess filled with packing which is compressed by a sleeve or gland to effect a tight joint between the packing and the valve stem. The packing used in stuffing boxes commonly employed for use with oil well pumps comprises a combination of a number of hollow conical seals stacked atop a solid or heavy bottom cone.
Each of the cones is formed with a split from top to bottom to facilita-te its installation around the valve stem or piston rod and to ensure a proper sealing action with both the gland and the piston rod. The cones also function to strip oil and other fluids away from the piston rod.
In use, the heavy bottom cone supports the three upper cones and, unlike the upper split cones, remains relatively in-flexible. Eventually, however, the continuous stresses to whichthe cones are subjected results in a permanent flattening or de-formation of the cones. This is particularly true of the heavy bottom cone. When deformed, the cones are no longer capable of effectively sealing the piston rod, resulting in leakage of fluid or perhaps a jamminy or binding of the piston rod. Obviously, when leakage or jamming occurs, the oil pump must be shut down to effect repairs, and just as obviously, a shutdown entails a con-siderable loss in time, expense and production.
It has been found that by inserting a frusto-conical annular support disc into -the recess formed into the bottom of the heavy split cone, the disc cooperates with -the cones to obviate and mitigate the aforementioned difficulties. The annular sup-port disc reinforces the heavy spli-t bot-tom cone and inhibits its deformation due to stress. The annular ring also assists in stripping oil away from the piston rod which in turn reduces the stresses to which the conical seals, and particularly the bottom seal, are subjected.
According to the present invention, then, there is pro-vided a support member for use in a stuffing box having a plu-rality of sealing members adapted to sealingly engage a recipro-cating piston rod, said sealing members being stacked one atop another within the body of the stuffing box with the lowermost of said members being in contact with the base of said stuffing box and wherein said lowermost member is formed with a recess in the bottom thereof; said support member comprising a solid annular ring having first and second planar surfaces in spaced parallel relation to each other, and a bore hole to receive said piston rod; wherein said annular ring is adapted to be inserted in said recess so that said first planar surface engages a lower surface of said lowermost sealing member and said second planar surface engages the base of said stuffing box to thereby reinforce said lower mos-t sealing member and to prevent deformation thereof.
There is also provided a stuffing box for mounting around a reciprocating piston rod comprising a housing, a plurality of stacked conical sealing members adapted to sealingly engage a reciprocating piston rod and arranged in said housing, the lower-most sealing member being supported from beneath by a support sur-face or said housing and having a recess, and a rigid support mem-ber contained in said recess, said support member comprising an annular ring with a bore hole adapted to closely receive said pi.ston rod, wherein an upper surface of said ring engages and supports at least a po.rtion of the surface of the recess and a lower surface of said riny is suppor-ted on said support surface of the housing, whereby said ring assists in preventing deforma-tion of the lowermost sealing member.
An embodimen-t of the invention will now be described ln greater detall and will be better understood when read ln conjunc--tlon wlth the followlng drawlngs, ln which:
Figure 1 ls a cross-sectlonal view of a typical stufflng box;
Elgure 2 ls a perspectlve vlew of the support disc and heavy split bottom cone.
Referring now to Figure 1, a single cone stuffing box employing the present lnvention has a housing generally designated by the numeral 1. Typlcally, the packlng employed in such boxes, especially when used ln assoclatlon with oil well pumps, is a stack of teflon impregnated rubber or graphite spllt frusto-conical cones. Typically also, the upper cones, in this case ~i there are three of them, are hollow split cones 2 whereas the bottom split cone 3 is solid with the exception of a truncatedconical portion hollowed out of the bottom of the cone and which forms a recess 5 therein. Each of the cones is formed wlth an opening 6 to receive a polish or sucker rod 7. The stack of regular spllt cones 2 ls supported by the heavy bottom cone 3 .
which in turn ls supported by the base 9 of housing recess 11.
The, prlmary function of the split cones is to seal the piston rod at lts point of entry into the well casing (not shown) to prevent any leakage of fluid. The seal between the cone aper-tures 6 and the piston rod 7 is formed by compressing the 0 cones by means of gland 12 to make a tight joint. The pressure exerted by gland 12 main-tains the cones in tight contact with piston rod 7 and the lnner surface 8 of housing 1. The amount of pressure exerted by yland 12 may be varied by suitable ad-justment of nuts la.
To prevent the flexing and ultimate collapse or flatten-ing of heavy bottom cone 3, which in and of itself is not suffi-ciently strong to withstand the pressures to which it is subject-ed, an annular support disc 16 is inserted into recess 5.
Referring now to Figure 2, the support disc 16 may be fabricated from brass or other suitable bearing-type material in-cluding plastic, aluminum or fiberglass. Most commercially avail-able split bottom cones are manufactured with a recess of the shape illustrated in Figure 2, i.e., a recess having inclined sides 19 (see Figure 1 as well). Accordingly, to provide maximum support and reinforcement to cone 3, support ring 16 is formed with inclined edges 20 corresponding in length and angle to recess boundary 19. Hence the frusto-conical shape of the support disc.
It will be appreciated, however, that the support disc may be formed to correspond to other recess shapes without departing from the inventive concept described hereïn. Indeed, it is also contemplated that the shape or cross-sectional configuration of the support disc need not correspond exactly with the shape or cross-sectional configuration of recess 5. By way of example, and with particular reference to Figure 1, some reinforcement of cone 3 would be achieved by a support disc of cylindrical configuration as denoted by the dotted lines. The diameter of the cylindrical disc could be less than or equal to the diameter of recess sur-face 22 but sufficiently greater than the diameter of aperture 24 to ensure proper support of cone 3 by the disc.
The support disc is inserted directly into recess 5.
When subjected to the pressures exerted by gland 12, surfaces 20 and 21 of the disc make contact with surfaces 19 and 22 of recess 5 respectively whereas lower surface 23 of the disc engages base 9 of stuffing box recess 11. Accordingly, the disc is positioned '~ absorb the stresses to which the cones, and particularly the bottom cone, are subjected and to prevent deformation thereof.
A bore hole 25 is formed into support disc 16 such that a clearance of approximately 1/16 of an inch is provided between the hole 25 and piston rod 7. In this respect, excess wear of the polish rod is avoided, while at the same time, the disc is effective to strip oil away from rod 7 before the oil would other-wise make contact with the split cones. Further, the diameter of lower disc surface 23 is less than the width of stuffing box -~-recess 11 such that if piston rod 7 is slightly off center, the disc may, to a limited extent, self-center itself to prevent excessive wear of the rod 7.
In one preferred emhodiment constructed by the applicant, the depth of the ring is 3/8", the external diameter at the base of the ring is less than three inches and the diameter of the bore `
hole is less than 1 1/4". This particular cone is suitable for a bottom cone having a height of 1 7/8" and an external diameter !~ `' slightly less than 3 1/2". It will be seen from the dimensions of the preferred ring that the depth of the ring is less than one- -~
slxth the external diemeter ~hereof.
~ , .
;' :... , , : ~ . ,
Stuffing boxes are ordinarily used to seal a valve stem at its point of entry into a valve body to prevent leakage of fluid from the valve. A stuffing box -typically comprises a cylin-drical recess filled with packing which is compressed by a sleeve or gland to effect a tight joint between the packing and the valve stem. The packing used in stuffing boxes commonly employed for use with oil well pumps comprises a combination of a number of hollow conical seals stacked atop a solid or heavy bottom cone.
Each of the cones is formed with a split from top to bottom to facilita-te its installation around the valve stem or piston rod and to ensure a proper sealing action with both the gland and the piston rod. The cones also function to strip oil and other fluids away from the piston rod.
In use, the heavy bottom cone supports the three upper cones and, unlike the upper split cones, remains relatively in-flexible. Eventually, however, the continuous stresses to whichthe cones are subjected results in a permanent flattening or de-formation of the cones. This is particularly true of the heavy bottom cone. When deformed, the cones are no longer capable of effectively sealing the piston rod, resulting in leakage of fluid or perhaps a jamminy or binding of the piston rod. Obviously, when leakage or jamming occurs, the oil pump must be shut down to effect repairs, and just as obviously, a shutdown entails a con-siderable loss in time, expense and production.
It has been found that by inserting a frusto-conical annular support disc into -the recess formed into the bottom of the heavy split cone, the disc cooperates with -the cones to obviate and mitigate the aforementioned difficulties. The annular sup-port disc reinforces the heavy spli-t bot-tom cone and inhibits its deformation due to stress. The annular ring also assists in stripping oil away from the piston rod which in turn reduces the stresses to which the conical seals, and particularly the bottom seal, are subjected.
According to the present invention, then, there is pro-vided a support member for use in a stuffing box having a plu-rality of sealing members adapted to sealingly engage a recipro-cating piston rod, said sealing members being stacked one atop another within the body of the stuffing box with the lowermost of said members being in contact with the base of said stuffing box and wherein said lowermost member is formed with a recess in the bottom thereof; said support member comprising a solid annular ring having first and second planar surfaces in spaced parallel relation to each other, and a bore hole to receive said piston rod; wherein said annular ring is adapted to be inserted in said recess so that said first planar surface engages a lower surface of said lowermost sealing member and said second planar surface engages the base of said stuffing box to thereby reinforce said lower mos-t sealing member and to prevent deformation thereof.
There is also provided a stuffing box for mounting around a reciprocating piston rod comprising a housing, a plurality of stacked conical sealing members adapted to sealingly engage a reciprocating piston rod and arranged in said housing, the lower-most sealing member being supported from beneath by a support sur-face or said housing and having a recess, and a rigid support mem-ber contained in said recess, said support member comprising an annular ring with a bore hole adapted to closely receive said pi.ston rod, wherein an upper surface of said ring engages and supports at least a po.rtion of the surface of the recess and a lower surface of said riny is suppor-ted on said support surface of the housing, whereby said ring assists in preventing deforma-tion of the lowermost sealing member.
An embodimen-t of the invention will now be described ln greater detall and will be better understood when read ln conjunc--tlon wlth the followlng drawlngs, ln which:
Figure 1 ls a cross-sectlonal view of a typical stufflng box;
Elgure 2 ls a perspectlve vlew of the support disc and heavy split bottom cone.
Referring now to Figure 1, a single cone stuffing box employing the present lnvention has a housing generally designated by the numeral 1. Typlcally, the packlng employed in such boxes, especially when used ln assoclatlon with oil well pumps, is a stack of teflon impregnated rubber or graphite spllt frusto-conical cones. Typically also, the upper cones, in this case ~i there are three of them, are hollow split cones 2 whereas the bottom split cone 3 is solid with the exception of a truncatedconical portion hollowed out of the bottom of the cone and which forms a recess 5 therein. Each of the cones is formed wlth an opening 6 to receive a polish or sucker rod 7. The stack of regular spllt cones 2 ls supported by the heavy bottom cone 3 .
which in turn ls supported by the base 9 of housing recess 11.
The, prlmary function of the split cones is to seal the piston rod at lts point of entry into the well casing (not shown) to prevent any leakage of fluid. The seal between the cone aper-tures 6 and the piston rod 7 is formed by compressing the 0 cones by means of gland 12 to make a tight joint. The pressure exerted by gland 12 main-tains the cones in tight contact with piston rod 7 and the lnner surface 8 of housing 1. The amount of pressure exerted by yland 12 may be varied by suitable ad-justment of nuts la.
To prevent the flexing and ultimate collapse or flatten-ing of heavy bottom cone 3, which in and of itself is not suffi-ciently strong to withstand the pressures to which it is subject-ed, an annular support disc 16 is inserted into recess 5.
Referring now to Figure 2, the support disc 16 may be fabricated from brass or other suitable bearing-type material in-cluding plastic, aluminum or fiberglass. Most commercially avail-able split bottom cones are manufactured with a recess of the shape illustrated in Figure 2, i.e., a recess having inclined sides 19 (see Figure 1 as well). Accordingly, to provide maximum support and reinforcement to cone 3, support ring 16 is formed with inclined edges 20 corresponding in length and angle to recess boundary 19. Hence the frusto-conical shape of the support disc.
It will be appreciated, however, that the support disc may be formed to correspond to other recess shapes without departing from the inventive concept described hereïn. Indeed, it is also contemplated that the shape or cross-sectional configuration of the support disc need not correspond exactly with the shape or cross-sectional configuration of recess 5. By way of example, and with particular reference to Figure 1, some reinforcement of cone 3 would be achieved by a support disc of cylindrical configuration as denoted by the dotted lines. The diameter of the cylindrical disc could be less than or equal to the diameter of recess sur-face 22 but sufficiently greater than the diameter of aperture 24 to ensure proper support of cone 3 by the disc.
The support disc is inserted directly into recess 5.
When subjected to the pressures exerted by gland 12, surfaces 20 and 21 of the disc make contact with surfaces 19 and 22 of recess 5 respectively whereas lower surface 23 of the disc engages base 9 of stuffing box recess 11. Accordingly, the disc is positioned '~ absorb the stresses to which the cones, and particularly the bottom cone, are subjected and to prevent deformation thereof.
A bore hole 25 is formed into support disc 16 such that a clearance of approximately 1/16 of an inch is provided between the hole 25 and piston rod 7. In this respect, excess wear of the polish rod is avoided, while at the same time, the disc is effective to strip oil away from rod 7 before the oil would other-wise make contact with the split cones. Further, the diameter of lower disc surface 23 is less than the width of stuffing box -~-recess 11 such that if piston rod 7 is slightly off center, the disc may, to a limited extent, self-center itself to prevent excessive wear of the rod 7.
In one preferred emhodiment constructed by the applicant, the depth of the ring is 3/8", the external diameter at the base of the ring is less than three inches and the diameter of the bore `
hole is less than 1 1/4". This particular cone is suitable for a bottom cone having a height of 1 7/8" and an external diameter !~ `' slightly less than 3 1/2". It will be seen from the dimensions of the preferred ring that the depth of the ring is less than one- -~
slxth the external diemeter ~hereof.
~ , .
;' :... , , : ~ . ,
Claims (10)
1. A support member for use in a stuffing box having a plurality of sealing members adapted to sealingly engage a reci-procating piston rod, said sealing members being stacked one atop another within the body of the stuffing box with the lowermost of said members being in contact with the base of said stuffing box and wherein said lowermost member is formed with a recess in the bottom thereof; said support member comprising a rigid annular ring having first and second planar surfaces in spaced parallel relation to each other and a bore hole to receive said piston rod; wherein said annular ring is adapted to be inserted into said recess so that said first planar surface engages a lower surface of said lowermost sealing member and said second planar surface engages the base of said stuffing box to thereby reinforce said lowermost sealing member and to prevent deformation thereof.
2. The support member of claim 1 wherein said annular ring is frustoconical in shape.
3. The support ring of claims 1 or 2 wherein the depth of said ring is less than one-sixth the external diameter thereof.
4. A stuffing box comprising a housing, a plurality of stacked conical sealing members adapted to sealingly engage a reciprocating piston rod and arranged in said housing, and wherein the lowermost of said sealing members, which engages the base of the stuffing box, has a recess formed in the bottom thereof; and a support member which is inserted into said recess; said support member comprising a rigid annular ring having first and second planar surfaces in spaced parallel relation to each other, and a bore hole to receive said piston rod; wherein said first planar surface engages a flat surface in the recess of said lowermost sealing member and said second planar surface contacts the base of said stuffing box thereby reinforcing said lowermost sealing member and preventing deformation thereof.
5. The stuffing box of claim 4 wherein said ring is frustoconical in shape.
6. The stuffing box of claims 4 or 5 wherein the shape and size of the annular ring corresponds to the shape and size of the recess formed into the lowermost sealing member.
7. The stuffing box of claims 4 or 5 wherein there is a clearance between said bore hole and said piston rod when said box is arranged about said rod.
8. The stuffing box of claims 4 or 5 wherein a clearance is provided between the maximum diameter portion of the annular ring and the body of said stuffing box.
9. A stuffing box for mounting around a reciprocating piston rod comprising a housing, a plurality of stacked conical sealing members adapted to sealingly engage a reciprocating piston rod and arranged in said housing, the lowermost sealing member being supported from beneath by a support surface of said housing and having a recess; and a rigid support member contained in said recess, said support member comprising an annular ring with a bore hole adapted to closely receive said piston rod; wherein an upper surface of said ring engages and supports at least a por-tion of the surface of the recess and a lower surface of said ring is supported on said support surface of the housing, whereby said ring assists in preventing deformation of the lowermost sealing member.
10. The stuffing box of claim 9 wherein the outer cir-cumferential surface of said ring tapers upwardly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA349,010A CA1116200A (en) | 1980-04-01 | 1980-04-01 | Stuffing box and support therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA349,010A CA1116200A (en) | 1980-04-01 | 1980-04-01 | Stuffing box and support therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1116200A true CA1116200A (en) | 1982-01-12 |
Family
ID=4116619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA349,010A Expired CA1116200A (en) | 1980-04-01 | 1980-04-01 | Stuffing box and support therefor |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1116200A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001036854A1 (en) * | 1999-11-15 | 2001-05-25 | Garlock, Inc. | Forged valve stem packing set |
| US8371519B2 (en) | 2009-04-17 | 2013-02-12 | Garlock Sealing Technologies Llc | Stem packing dispenser |
| CN112593891A (en) * | 2020-12-28 | 2021-04-02 | 雅安万利橡塑密封技术有限责任公司 | Blowout prevention box rubber core sealing assembly |
-
1980
- 1980-04-01 CA CA349,010A patent/CA1116200A/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001036854A1 (en) * | 1999-11-15 | 2001-05-25 | Garlock, Inc. | Forged valve stem packing set |
| US6273431B1 (en) | 1999-11-15 | 2001-08-14 | Garlock Inc | Forged valve stem packing set |
| US8371519B2 (en) | 2009-04-17 | 2013-02-12 | Garlock Sealing Technologies Llc | Stem packing dispenser |
| CN112593891A (en) * | 2020-12-28 | 2021-04-02 | 雅安万利橡塑密封技术有限责任公司 | Blowout prevention box rubber core sealing assembly |
| CN112593891B (en) * | 2020-12-28 | 2022-05-31 | 雅安万利橡塑密封技术有限责任公司 | Blowout prevention box rubber core sealing assembly |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3939910A (en) | Stuffing box and blow out preventing device for polish rods of oil well pumping units | |
| EP0308390B1 (en) | Valve stem packing containment for high pressure, high temperature | |
| US5409337A (en) | Retained seal assembly | |
| US6007070A (en) | Pressure actuated packing assembly | |
| EP0480899A2 (en) | Live load packing system | |
| PL353226A1 (en) | Basic seal for rods and pistons | |
| US5845909A (en) | Stuffing box with improved packing rings and method | |
| EP0483096A1 (en) | Packing containment for live loaded fugitive emission seals | |
| US5139274A (en) | Seal for a hydraulic ram | |
| US4438935A (en) | Fluid seals | |
| US4617957A (en) | Rotary plug valve | |
| HU208564B (en) | Pressure-limiting valve | |
| US4557488A (en) | Hydraulic seal with pressure-actuated ridges | |
| WO1990000693A1 (en) | A combination seal for sealing between two machine parts | |
| US4562798A (en) | Cylinder head locking construction | |
| US20140125012A1 (en) | Compressable sealing ring assembly | |
| US3471156A (en) | Inflatable packing for stuffing boxes | |
| US5058668A (en) | Rod guide bearing assembly for oil well pumping apparatus | |
| CA1116200A (en) | Stuffing box and support therefor | |
| US4577873A (en) | Dual valve stem packing arrangement | |
| US4643440A (en) | Packing with compensating means | |
| US5257812A (en) | Polished rod protection and sealing device | |
| US2918336A (en) | Piston | |
| EP0590501A1 (en) | Valve assembly | |
| US2204915A (en) | Stuffing gland |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |