CA2347613C - Stuffing box - Google Patents
Stuffing box Download PDFInfo
- Publication number
- CA2347613C CA2347613C CA002347613A CA2347613A CA2347613C CA 2347613 C CA2347613 C CA 2347613C CA 002347613 A CA002347613 A CA 002347613A CA 2347613 A CA2347613 A CA 2347613A CA 2347613 C CA2347613 C CA 2347613C
- Authority
- CA
- Canada
- Prior art keywords
- housing
- internal sleeve
- sealing surface
- stuffing box
- bearing
- 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
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
- F16J15/54—Other sealings for rotating shafts
Abstract
A stuffing box includes a housing and an internal sleeve positioned within the housing. Bearings are positioned in an annular space between the internal sleeve and the housing, such that the internal sleeve is journalled for rotation within the housing. Static seals are positioned within the internal sleeve to engage a rod. A mechanical seal is disposed in the annular space between the internal sleeve and the housing to block the passage of produced well fluids into the bearings.
The mechanical seal has a first body with a first sealing surface secured to and rotating with the internal sleeve and a second body with a second sealing surface secured to and remaining stationary with the housing. Biasing springs are provided to maintain the first sealing surface and the second sealing surface in sealing engagement.
The mechanical seal has a first body with a first sealing surface secured to and rotating with the internal sleeve and a second body with a second sealing surface secured to and remaining stationary with the housing. Biasing springs are provided to maintain the first sealing surface and the second sealing surface in sealing engagement.
Description
TITLE OF THE INVENTION:
Stuffing Box FIELD OF THE INVENTION
The present invention relates to a stuffing box for use with pumps or any other type of equipment in which a rotating shaft requires sealing.
BACKGROUND OF THE INVENTION
Stuffing boxes, such as Canadian Patent 2,028,555 (Newton), are built with packing that is compressed to engage a rotating rod and prevent the passage of produced well fluids.
The rotation of the rod creates a dynamic sealing application that inevitably causes the packing to wear.
In order to address this problem, a new generation of stuffing boxes are being built with internal sleeves that rotate on bearings within a stuffing box housing. This creates a static sealing application between the internal sleeve and the rod, as the internal sleeve rotates with the rod. This static sealing application does not have the same problem with wear and, therefore, ha;~ a long life. A seal is, however, required between the stuffing box housing and the internal sleeve in order to prevent produced well fluids from getting into the bearings. To date elastomer lip seals have been used.
As sealing the rotating internal sleeve is a dynamic sealing application, the seals wear. In order to address this problem a series of redundant seals are provided so that when one seal fails there is always another to perform the required sealing function. Unfortunately, the rate of seal failure is unacceptably rapid in some applications. In high temperature wells, the presence of heat adversely affects the performance of the elastomer seals. In slant wells, an unbalanced load upon the elastomer seal .Leads to premature failure.
SUN~IARY OF THE INVENTION
What is required i~~ a stuffing box with a more robust seal.
According to the present invention there is provided a stuffing box which includes a housing and an internal sleeve positioned within the housing. Bearings are positioned in an annular space between the internal sleeve and the housing, such that the internal sleeve is journalled for rotation within the housing. Static seals are positioned within the internal sleeve to engage a rod. A mechanical seal is disposed in the annular space between the internal sleeve and the housing to block the passage of produced well fluids into the bearings.
The mechanical seal has a first body with a first sealing surface secured to and rotating with the internal sleeve and a second body with a second sealing surface secured to and remaining stationary with the housing. Biasing means are provided to maintain the first sealing surface and the second sealing surface in sealing engagement.
BRIEF DESCRIPTION OF THE DRAWINGS
These and other features of the invention will become more apparent from the following description in which reference is made to the appended drawings, the drawings are for the purpose of illustration only and are not intended to in any way limit the scope of the invention to the particular embodiment or embodiments shown, wherein:
FIGURE 1 is a side elevation view, in section, of a first embodiment of stuffing box constructed in accordance with the teachings of the present invention.
FIGURE 2 is a side elevation view, in section, of a second embodiment of stuffing box constructed in accordance with the teachings of the present invention.
FIGURE 3 is a detailed side elevation view, in section, of the mechanical seal used in both the first embodiment illustrated in FIGURE 1 and the second embodiment illustrated in FIGURE 2.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Stuffing Box FIELD OF THE INVENTION
The present invention relates to a stuffing box for use with pumps or any other type of equipment in which a rotating shaft requires sealing.
BACKGROUND OF THE INVENTION
Stuffing boxes, such as Canadian Patent 2,028,555 (Newton), are built with packing that is compressed to engage a rotating rod and prevent the passage of produced well fluids.
The rotation of the rod creates a dynamic sealing application that inevitably causes the packing to wear.
In order to address this problem, a new generation of stuffing boxes are being built with internal sleeves that rotate on bearings within a stuffing box housing. This creates a static sealing application between the internal sleeve and the rod, as the internal sleeve rotates with the rod. This static sealing application does not have the same problem with wear and, therefore, ha;~ a long life. A seal is, however, required between the stuffing box housing and the internal sleeve in order to prevent produced well fluids from getting into the bearings. To date elastomer lip seals have been used.
As sealing the rotating internal sleeve is a dynamic sealing application, the seals wear. In order to address this problem a series of redundant seals are provided so that when one seal fails there is always another to perform the required sealing function. Unfortunately, the rate of seal failure is unacceptably rapid in some applications. In high temperature wells, the presence of heat adversely affects the performance of the elastomer seals. In slant wells, an unbalanced load upon the elastomer seal .Leads to premature failure.
SUN~IARY OF THE INVENTION
What is required i~~ a stuffing box with a more robust seal.
According to the present invention there is provided a stuffing box which includes a housing and an internal sleeve positioned within the housing. Bearings are positioned in an annular space between the internal sleeve and the housing, such that the internal sleeve is journalled for rotation within the housing. Static seals are positioned within the internal sleeve to engage a rod. A mechanical seal is disposed in the annular space between the internal sleeve and the housing to block the passage of produced well fluids into the bearings.
The mechanical seal has a first body with a first sealing surface secured to and rotating with the internal sleeve and a second body with a second sealing surface secured to and remaining stationary with the housing. Biasing means are provided to maintain the first sealing surface and the second sealing surface in sealing engagement.
BRIEF DESCRIPTION OF THE DRAWINGS
These and other features of the invention will become more apparent from the following description in which reference is made to the appended drawings, the drawings are for the purpose of illustration only and are not intended to in any way limit the scope of the invention to the particular embodiment or embodiments shown, wherein:
FIGURE 1 is a side elevation view, in section, of a first embodiment of stuffing box constructed in accordance with the teachings of the present invention.
FIGURE 2 is a side elevation view, in section, of a second embodiment of stuffing box constructed in accordance with the teachings of the present invention.
FIGURE 3 is a detailed side elevation view, in section, of the mechanical seal used in both the first embodiment illustrated in FIGURE 1 and the second embodiment illustrated in FIGURE 2.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Preferred embodiments of stuffing box will now be described with reference to FIGURES 1 through 3. A first embodiment of stuffing box, generally identified by reference numeral 10, will be described with reference to FIGURE 1. A
second embodiment of stuffing box, generally identified by reference numeral 100, will be described with reference to FIGURE 2. As will hereinafter be further described, the difference between stuffing box 10 and stuffing box 100 lies in the type of housing used and its manner of mounting.
First Embodiment:
Referring to FIGURE l, there is provided a stuffing box 10 which includes a housing 12 and an internal sleeve 14 positioned within housing 12. A first bearing 16, a second bearing 18, a thrust washer 28 and a bushing 68 are positioned in an annular space 20 bE=tween internal sleeve 14 and housing 12, such that internal :sleeve 14 is journalled for rotation within housing 12. Fir:~t bearing 16 is positioned within a bearing sleeve 22. Thrust washer 28 prevents axial movement of internal sleeve 14, so that internal sleeve 14 does not get pushed up out of position. Thrust washer 28 carries a first seal 24 and second seal 26. First bearing 16 is separated from second bearing 18 by a bearing separator 30. Second bearing 18 engages a shoulder 19 that limits its movement within annular space 20. A snap ring 27 is positioned above thrust washer 28 that also limits movement within annular space 20.
A leak cock 32 is provided on housing 12 for supplying lubricant to first bearing 16 and second bearing 18.
A shaft cap 34 and static seals 36 are positioned within internal sleeve 14 to engage a rod 38. Allen bolts 40 are used to tighten a rod clamp 4:? around rod 38. Rod clamp 42 serves to preclude movement of internal sleeve 14 relative to rod 38.
This ensures that internal sleeve 14 and rod 38 move as a unit and avoids relative movement that would cause wear of static seals 26.
second embodiment of stuffing box, generally identified by reference numeral 100, will be described with reference to FIGURE 2. As will hereinafter be further described, the difference between stuffing box 10 and stuffing box 100 lies in the type of housing used and its manner of mounting.
First Embodiment:
Referring to FIGURE l, there is provided a stuffing box 10 which includes a housing 12 and an internal sleeve 14 positioned within housing 12. A first bearing 16, a second bearing 18, a thrust washer 28 and a bushing 68 are positioned in an annular space 20 bE=tween internal sleeve 14 and housing 12, such that internal :sleeve 14 is journalled for rotation within housing 12. Fir:~t bearing 16 is positioned within a bearing sleeve 22. Thrust washer 28 prevents axial movement of internal sleeve 14, so that internal sleeve 14 does not get pushed up out of position. Thrust washer 28 carries a first seal 24 and second seal 26. First bearing 16 is separated from second bearing 18 by a bearing separator 30. Second bearing 18 engages a shoulder 19 that limits its movement within annular space 20. A snap ring 27 is positioned above thrust washer 28 that also limits movement within annular space 20.
A leak cock 32 is provided on housing 12 for supplying lubricant to first bearing 16 and second bearing 18.
A shaft cap 34 and static seals 36 are positioned within internal sleeve 14 to engage a rod 38. Allen bolts 40 are used to tighten a rod clamp 4:? around rod 38. Rod clamp 42 serves to preclude movement of internal sleeve 14 relative to rod 38.
This ensures that internal sleeve 14 and rod 38 move as a unit and avoids relative movement that would cause wear of static seals 26.
A mechanical seal 44 is disposed in annular space 20 between internal sleeve :14 and housing 12 to block the passage of produced well fluids into first bearing 16 and second bearing 18. Referring to FIGURE 3, mechanical seal 44 has a first body 46 with a first sealing surface 50 and a second body 48 with a second sealing surface 56. First body 46 is secured to and rotates with internal sleeve 14. First body 46 secured to internal sleeve 14 with set screws 52. An o-ring seal 54 is positioned between first body 46 and internal sleeve 14 to serve a static sealing function. Second body 48 is secured to housing 12 by pins 58 and remains stationary with housing 12.
Pin 58 projects into a travel groove 60 in housing 12 so as to prevent rotation while permitting second body 48 to travel in groove 60 axially along housing 12. An o-ring seal 62 is provided between second body 48 and housing 12 and serves a static sealing function.
Belville springs 64 are provided for biasing first sealing surface 50 and second sealing surface 56 in sealing engagement .
It will be appreciated that other biasing means can also be used to maintain the sea:Ling engagement between first sealing surface 50 and second sealing surface 56. Referring to FIGURE
1, a grease nipple 66 is provided on housing 12 for supplying lubricant to mechanical seal 44. Apertures 70 are provided on top flange 72 and bottom flange 74 of housing 12 for the purpose of mounting stuff box 10.
Second Embodiment:
Referring to FIGURE 2, there is provided a second embodiment of a stuffing box 100, that is substantially the same as first embodiment 10 except for the type of housing and the mounting. Second embodiment 100 includes housing 110 that has a first portion 117_ and a second or base portion 112 whereas first embodiment 10 has a unitary body 12 with integral flanges 72 and 74. In second embodiment 100, second or base portion 112 of housing 110 underlies first portion 111 and is joined to first potion 1.11 by alien bolts 113. Only second portion 112 has apertures 115 adapted to receive screws or other securing devices for the purpose mounting stuffing box 100. Second embodiment 100 includes an internal sleeve 114 positioned within first portion 111 of housing 110. A first 5 bearing 116 and a second bearing 118 are positioned in an annular space 120 between internal sleeve 114 and first portion 111 of housing 110, such that internal sleeve 114 is journal led for rotation within first portion 111 of housing 110. First bearing 116 is positioned within a bearing sleeve 122. Thrust washer 128 carries a first seal 124 and second seal 126. First bearing 116 is separated from second bearing 118 by a bearing separator 130. Second bearing 118 engages a shoulder 119 that limits its movement within annular space 120. A snap ring 127 is positioned above thrust washer 128 that also limits movement within annular space 120. A leak cock 132 is provided on first portion 111 of housing L10 for supplying lubricant to first bearing 116 and second bearing 118.
A shaft cap 134 and static seals 136 are positioned within internal sleeve 114 to engage a rod 138. Allen bolts 140 are used to tighten a rod clamp 142 around rod 138 in order to prevent rod 138 from being withdrawn from internal sleeve 114.
A mechanical seal 144 is disposed in annular space 120 between internal sleeve 114 and first portion 111 of housing 110 to block the passage of produced well fluids into first bearing 116 and second bearing 118. Mechanical seal 144 has a first body 146 with a first sealing surface 150 and a second body 148 with a second sealing surface 156. First body 146 is secured by set screws 15:? to and rotates with internal sleeve 114. An o-ring seal 154 is positioned between first body 146 and internal sleeve 114 and serves a static sealing function.
Second body 148 is secured by pins 158 to and remains stationary with housing 110. Pins 158 project into travel grooves 160 in first portion 111 of housing 110 so as to permit second body 148 to travel axially along groove 160 relative to first portion 111 of housing 110. An o-ring seal 162 is provided between second body 148 and first portion 111 of housing 110 and serves a. static sealing function.
Belville springs 164 are provided for biasing first sealing surface 150 and second sealing surface 156 in sealing engagement. A grease nipple 166 is provided on first portion 111 of housing 110 for supplying lubricant to mechanical seal 144. A bushing 168 and o-ring seal 170 are provided between second portion 112 of housing 110 and rod 138.
Operation:
The use and operation of first embodiment 10 and second embodiment 100 will now :be described with reference to FIGURE
1. Referring to FIGURE 1, stuffing box 10 is adapted to receive rod 38. Rod 38 prevented from being withdrawn from internal sleeve 14 by rod clamp 42 and allan bolts 40. During operation, internal sleeve 14 rotates with rod 38. Rotational movement of internal sleeve 14 is accommodated by first bearing 16, second bearing 18, bushing 68 and thrust washer 28.
Static seal 36 is positioned to prevent leakage between rod 38 and internal sleeve 14. Static seal 54 is positioned to prevent leakage between :First body 46 and internal sleeve 14.
Static seal 62 is positioned to prevent leakage between second body 48 and housing 12. Mechanical seal 44 is disposed in annular space 20 between internal sleeve 14 and housing 12 to block the passage of produced well fluids into first bearing 16 and second bearing 18. Second sealing face 56 of second body 48 engages first sealing face 50 of first body 46 to form mechanical seal 44, thereby preventing any passage of produced well fluids. Spring 64 maintains the sealing faces engaged at all times, even as wear occurs. With dynamic sealing applications such as those necessary with stuffing box 10, use of mechanical seal 44 in stuf f ing box 10 provides a more robust alternative to the use of redundant seals which tend to fail prematurely.
The sealing system for stuffing box 10, as described above, has very high pressure dynamic capability. It can operate at pressures at or above 3500 p.s.i. without leakage.
At ambient temperatures, stuffing box 10 does not require any external cooling. For high temperature applications, external cooling can be added to stuffing box 10.
In this patent document, the word "comprising" is used in its non-limiting sense to mean that items following the word are included, but items not specifically mentioned are not excluded. A reference to an element by the indefinite article "a" does not exclude the possibility that more than one of the element is present, unless the context clearly requires that there be one and only one of the elements.
It will be apparent to one skilled in the art that modifications may be made to the illustrated embodiment without departing from the spirit and scope of the invention as hereinafter defined in the Claims.
Pin 58 projects into a travel groove 60 in housing 12 so as to prevent rotation while permitting second body 48 to travel in groove 60 axially along housing 12. An o-ring seal 62 is provided between second body 48 and housing 12 and serves a static sealing function.
Belville springs 64 are provided for biasing first sealing surface 50 and second sealing surface 56 in sealing engagement .
It will be appreciated that other biasing means can also be used to maintain the sea:Ling engagement between first sealing surface 50 and second sealing surface 56. Referring to FIGURE
1, a grease nipple 66 is provided on housing 12 for supplying lubricant to mechanical seal 44. Apertures 70 are provided on top flange 72 and bottom flange 74 of housing 12 for the purpose of mounting stuff box 10.
Second Embodiment:
Referring to FIGURE 2, there is provided a second embodiment of a stuffing box 100, that is substantially the same as first embodiment 10 except for the type of housing and the mounting. Second embodiment 100 includes housing 110 that has a first portion 117_ and a second or base portion 112 whereas first embodiment 10 has a unitary body 12 with integral flanges 72 and 74. In second embodiment 100, second or base portion 112 of housing 110 underlies first portion 111 and is joined to first potion 1.11 by alien bolts 113. Only second portion 112 has apertures 115 adapted to receive screws or other securing devices for the purpose mounting stuffing box 100. Second embodiment 100 includes an internal sleeve 114 positioned within first portion 111 of housing 110. A first 5 bearing 116 and a second bearing 118 are positioned in an annular space 120 between internal sleeve 114 and first portion 111 of housing 110, such that internal sleeve 114 is journal led for rotation within first portion 111 of housing 110. First bearing 116 is positioned within a bearing sleeve 122. Thrust washer 128 carries a first seal 124 and second seal 126. First bearing 116 is separated from second bearing 118 by a bearing separator 130. Second bearing 118 engages a shoulder 119 that limits its movement within annular space 120. A snap ring 127 is positioned above thrust washer 128 that also limits movement within annular space 120. A leak cock 132 is provided on first portion 111 of housing L10 for supplying lubricant to first bearing 116 and second bearing 118.
A shaft cap 134 and static seals 136 are positioned within internal sleeve 114 to engage a rod 138. Allen bolts 140 are used to tighten a rod clamp 142 around rod 138 in order to prevent rod 138 from being withdrawn from internal sleeve 114.
A mechanical seal 144 is disposed in annular space 120 between internal sleeve 114 and first portion 111 of housing 110 to block the passage of produced well fluids into first bearing 116 and second bearing 118. Mechanical seal 144 has a first body 146 with a first sealing surface 150 and a second body 148 with a second sealing surface 156. First body 146 is secured by set screws 15:? to and rotates with internal sleeve 114. An o-ring seal 154 is positioned between first body 146 and internal sleeve 114 and serves a static sealing function.
Second body 148 is secured by pins 158 to and remains stationary with housing 110. Pins 158 project into travel grooves 160 in first portion 111 of housing 110 so as to permit second body 148 to travel axially along groove 160 relative to first portion 111 of housing 110. An o-ring seal 162 is provided between second body 148 and first portion 111 of housing 110 and serves a. static sealing function.
Belville springs 164 are provided for biasing first sealing surface 150 and second sealing surface 156 in sealing engagement. A grease nipple 166 is provided on first portion 111 of housing 110 for supplying lubricant to mechanical seal 144. A bushing 168 and o-ring seal 170 are provided between second portion 112 of housing 110 and rod 138.
Operation:
The use and operation of first embodiment 10 and second embodiment 100 will now :be described with reference to FIGURE
1. Referring to FIGURE 1, stuffing box 10 is adapted to receive rod 38. Rod 38 prevented from being withdrawn from internal sleeve 14 by rod clamp 42 and allan bolts 40. During operation, internal sleeve 14 rotates with rod 38. Rotational movement of internal sleeve 14 is accommodated by first bearing 16, second bearing 18, bushing 68 and thrust washer 28.
Static seal 36 is positioned to prevent leakage between rod 38 and internal sleeve 14. Static seal 54 is positioned to prevent leakage between :First body 46 and internal sleeve 14.
Static seal 62 is positioned to prevent leakage between second body 48 and housing 12. Mechanical seal 44 is disposed in annular space 20 between internal sleeve 14 and housing 12 to block the passage of produced well fluids into first bearing 16 and second bearing 18. Second sealing face 56 of second body 48 engages first sealing face 50 of first body 46 to form mechanical seal 44, thereby preventing any passage of produced well fluids. Spring 64 maintains the sealing faces engaged at all times, even as wear occurs. With dynamic sealing applications such as those necessary with stuffing box 10, use of mechanical seal 44 in stuf f ing box 10 provides a more robust alternative to the use of redundant seals which tend to fail prematurely.
The sealing system for stuffing box 10, as described above, has very high pressure dynamic capability. It can operate at pressures at or above 3500 p.s.i. without leakage.
At ambient temperatures, stuffing box 10 does not require any external cooling. For high temperature applications, external cooling can be added to stuffing box 10.
In this patent document, the word "comprising" is used in its non-limiting sense to mean that items following the word are included, but items not specifically mentioned are not excluded. A reference to an element by the indefinite article "a" does not exclude the possibility that more than one of the element is present, unless the context clearly requires that there be one and only one of the elements.
It will be apparent to one skilled in the art that modifications may be made to the illustrated embodiment without departing from the spirit and scope of the invention as hereinafter defined in the Claims.
Claims (3)
1. A stuffing box, comprising:
a housing;
an internal sleeve positioned within the housing;
bearings positioned in an annular space between the internal sleeve and the housing, such that the internal sleeve is journalled for rotation within the housing;
static seals positioned within the internal sleeve, the static seals being adapted to engage a rod;
a mechanical seal disposed in the annular space between the internal sleeve and the housing to block the passage of produced well fluids into the bearings, the mechanical seal having a first body with a first sealing surface secured to and rotating with the internal sleeve and a second body with a second sealing surface secured to and remaining stationary with the housing; and biasing means maintaining the first sealing surface and the second sealing surface in sealing engagement.
a housing;
an internal sleeve positioned within the housing;
bearings positioned in an annular space between the internal sleeve and the housing, such that the internal sleeve is journalled for rotation within the housing;
static seals positioned within the internal sleeve, the static seals being adapted to engage a rod;
a mechanical seal disposed in the annular space between the internal sleeve and the housing to block the passage of produced well fluids into the bearings, the mechanical seal having a first body with a first sealing surface secured to and rotating with the internal sleeve and a second body with a second sealing surface secured to and remaining stationary with the housing; and biasing means maintaining the first sealing surface and the second sealing surface in sealing engagement.
2. The stuffing box as defined in Claim 1, wherein the biasing means are springs.
3. The stuffing box as defined in Claim 2, wherein the springs are belville springs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002347613A CA2347613C (en) | 2001-05-16 | 2001-05-16 | Stuffing box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002347613A CA2347613C (en) | 2001-05-16 | 2001-05-16 | Stuffing box |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2347613A1 CA2347613A1 (en) | 2002-02-07 |
| CA2347613C true CA2347613C (en) | 2003-01-14 |
Family
ID=4169050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002347613A Expired - Lifetime CA2347613C (en) | 2001-05-16 | 2001-05-16 | Stuffing box |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2347613C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7874369B2 (en) | 2006-09-13 | 2011-01-25 | Weatherford/Lamb, Inc. | Progressive cavity pump (PCP) drive head stuffing box with split seal |
-
2001
- 2001-05-16 CA CA002347613A patent/CA2347613C/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7874369B2 (en) | 2006-09-13 | 2011-01-25 | Weatherford/Lamb, Inc. | Progressive cavity pump (PCP) drive head stuffing box with split seal |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2347613A1 (en) | 2002-02-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6210107B1 (en) | Barrier seal systems | |
| US4294454A (en) | Rotary seal unit | |
| US8240672B2 (en) | Low breakout friction energized gasket | |
| US4427204A (en) | Mechanical end face seal | |
| US9429238B2 (en) | Dynamic backup ring assembly | |
| US4629338A (en) | Seal and bearing apparatus for bits | |
| US20110127725A1 (en) | Pressure-balanced floating seal housing assembly and method | |
| US9845879B2 (en) | High pressure dynamic sealing arrangement | |
| EP0375686A1 (en) | Mechanical face seal means having centering means. | |
| US5409240A (en) | Seal with self-lubricating contact surface | |
| US7389832B2 (en) | Hydrostatic mechanical seal with local pressurization of seal interface | |
| EP0024424A1 (en) | Pressure shaft seal and method | |
| US6109659A (en) | Hydrostatic rotary union | |
| CA2941783C (en) | Unitized lip seal for wash pipe stuffing box sealing system | |
| US9746080B2 (en) | High pressure seal assembly for a moveable shaft | |
| JP2003278921A (en) | Shaft seal device | |
| US20040245727A1 (en) | Seal balancing system and method for high pressure and high velocity applications | |
| CA2347613C (en) | Stuffing box | |
| US20080106045A1 (en) | Decoupled shaft seal for a progressive cavity pump stuffing box | |
| US7669650B2 (en) | Stuffing box for rotating rod | |
| US3198530A (en) | Outside balanced mechanical seal | |
| EP3887696B1 (en) | Seal assembly with anti-rotation and stability features | |
| CN108413040A (en) | Lip mechanically-sealing apparatus | |
| Dietle et al. | Advancements in extreme pressure rotary sealing | |
| CN216691893U (en) | Bearing box with mechanical seal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20210517 |