CA1136667A - Seal assembly - Google Patents
Seal assemblyInfo
- Publication number
- CA1136667A CA1136667A CA000392605A CA392605A CA1136667A CA 1136667 A CA1136667 A CA 1136667A CA 000392605 A CA000392605 A CA 000392605A CA 392605 A CA392605 A CA 392605A CA 1136667 A CA1136667 A CA 1136667A
- Authority
- CA
- Canada
- Prior art keywords
- seal
- lip
- groove
- seal element
- 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
Links
Landscapes
- Details Of Reciprocating Pumps (AREA)
Abstract
SEAL ASSEMBLY
Abstract of the Disclosure A seal assembly for a downhole hydraulically operated oil well pump has a dovetail shaped groove around the exterior of the pump body and a seal element mounted therein. The seal element has an inner side resting against the groove bottom, one end of a full thickness filling that end of the groove and extending therefrom toward the opposite end having a recess portion around the outer perimeter there-of forming a lip about a mid-portion of the seal element which is deformed by fluid pressure acting toward that end of the seal to urge the lip outward into sealing contact with a pump housing which encloses the pump body.
Abstract of the Disclosure A seal assembly for a downhole hydraulically operated oil well pump has a dovetail shaped groove around the exterior of the pump body and a seal element mounted therein. The seal element has an inner side resting against the groove bottom, one end of a full thickness filling that end of the groove and extending therefrom toward the opposite end having a recess portion around the outer perimeter there-of forming a lip about a mid-portion of the seal element which is deformed by fluid pressure acting toward that end of the seal to urge the lip outward into sealing contact with a pump housing which encloses the pump body.
Description
~136667 This invention is related to a seal assembly, and more particularly to a seal assembly which may be used with downhole oil well hydraulic pumps to seal between the pump body and a housing which contains or mounts the pump when it is installed in the well.
T'nis is a division of copending Canadian Patent Application Serial number 330,781, filed June 28, 1979.
Some pumps used in this oil well service are provided with some type of seal around the pump body to seal ~ithin - 10 portions of the pump housing. Typically these seals are constructed with a metal ring to provide sufficient radial strength and prevent their being dislodged from the pump body while the pump is-installed in or removed from the well.
Because these prior art seal constructions include a metal rina, the seal cannot be radially expanded and slipped over the pump body for installation. This construction necessitates the pump body being made in several separable sections to allow for installation of these seals. This multiple section construction complicates the manufacture of the pump body as well as requiring additional seals within the pump.
.,~. ... .
According to the present invention there is provided a seal assembly for sealin~g around a tubular member which is mounted within an opening in a housing or the like. The assembly includes a cross-sectional generally dovetail shaped groove around the tubular member with one side of the groove being dovetailed in the bottom portion only and having the outer portion of the side inclined in a divergent relation from the groove. An annular seal element is mounted within the aroove and extends therefrom and includes an inner portion contacting cg/ ~
: ; :
~136667 the bottom of the groove, ~n auter portion extends from the groove, and an outer peripheral sealinq surface is provided on the exterior of the seal element. The seal element has a lip formed at one end portion thereof by a recess around the outer perimeter thereof which undercuts a segment of the seal ring at that end portion thereof. The lip is shaped so that the fluid acting toward the end portion of the seal element havin~ the lip will urge the lip outward into sealin~ engagement with the housing.
One object of this invention is to provide a seal assembly overcoming the aforementioned disadvantaqes o the prior art devices.
Still an object of a specific embodiment of the invention is to provide a seal assembly for a do~hole oil well hydraulic pump which can be easily slipped over the pump body and held in place by the shape of the groove around the body.
It is also an object of a specific embodiment of the invention to provide a seal assembly for a hydraulic oil well pump which can withstand repeated assembly and disassembly by installing the pump body within the housing and removing it from the housing-without damage to the seal element.
Various other objects, advantages, and features of this invention will become apparent to those skilled in the art from the following discussion, taken in conjunction with the accompanying drawings, in which:
DESCRIPTION OF THE DRAWINGS
Fig. 1 is a cutaway pictorial elevation view of a segment of well casing having a hydraulically actuated down-hole pump housing and pump body mounted therein;
~- 2 -cg/~V
.:
113f~667 Fig. 2 is a cross-sectional elevation view of a seq-ment of a pump housing and a segment of a pump body having the seal assembly of thls invention with the seal element spaced from the entrance to the pump housing prior to instal-lation;
Fig. 3 is a cross-sectional elevation viéw of a segment of the pump housing and pump body shown in Fig. 2 with the seal assembly installed;
Fig. 4 is an enlarged cross-sectional elevation view 1~ of the seal element alone in a free position;
Fig. 5 is an enlarged cross-sectional elevation view of a segment of the pump body having the groove and with the seal element shown positioned therein in dashed lines; and Fig. 6 is an enlarged cross-sectional elevation view of a segment of the pump body and pump housing t~7ith the seal ring mounted therein showing the seal element with fluid pressure applied toward the seal from the upper portion of the figure or the end of the seal havin~ the recess.
- 2a -cg/~C~
'' ' " ' 1136667 The following is a discussion and description of preferred specific embodiments of the seal assembly of this invention, such being made with reference to the drawings, whereupon the same reference numerals are used to indicate the same or similar parts and/or structure. It is to be understood that such description and discussion is not to unduly limit the scope of the invention.
Detailed Description Referring to Fig. 1, such shows a downhole oil well 10 hydraulically actuated pump and employing the seal assemblies of this invention mounted within a segment of casing 10. The ~ pump consists of a pump housing 12 which is sealingly mounted within casing 10 and is hollow on the interior thereof to receive and mount the pump body 14 which contains the working 15 elements of the pump. Pump body 14 contains a pair of pis-tons 16 which are secured to opposite ends of a pump rod 18.
Pump rod 18 extends through a reversing valve assembly 20 which controls the motion of the pistons 16. Fluid passage-ways between pump body 14 and pump housing 12 are sealed by 20 a plurality of seal assemblies 22. The several seal assem-blies 22 are a plurality of the seal assembly of this inven-tion and provide seals at the points within the pump where fluid under pressure i5 transmitted between pump housing 12 and pump body 14.
Fig. 2 shows a segment of pump housing 12 and a segment of pump body 14 with seal assembly 22 around pump body 14 in a spaced relation to the pump housing bore 24 where it will ultimately reside when installed. Displacement of pump body 14 into its final resting position in pump hous-30 ing 12 positions the seal assembly within the confines of seal bore 24. Positioning seal assembly 22 at this location rad;ally compresses the seal element 26 to produce a fluid tight seal between pump body 14 and pump housing 12.
Fig. 4 shows seal element 26 in an enlarged cross-35 sectional view with the seal element in its undeformed or free state. Seal member 26 is constructed of a molded elastomeric compound andformed in the shown shape. The interior of seal element 2S has an inner peripheral surface 28 which is uniform in cross-section and substantially the 1~36667 same diameter as the bottom of the groove in which the seal element will be mounted. The exterior of seal element 26 has an outer peripheral surface 30 which is inclined relative to inner peripheral surface 28. A recess at one end of seal 5 element 26 around the outer periphery thereof forms a lip 32.
Outer peripheral surface 30 is inclined or tapered so the - portion of the seal element having lip 32 is at the greater thickness portion of the seal element. Seal end surface 36 is inclined relative to inner peripheral surface 28 and ori-10 ented to fit within the confines of the dovetail groovearound the valve body 14. Seal end surface 36 is smoothly curved to join seal inner peripheral surface 28 as shown.
Seal end surface 40 is angularly oriented to cor-respond with the internal shape of the dovetail groove in 15 valve body 14. Seal end surface 40 is smoothly curved to join seal inner peripheral surface 28 as shown. Around the outer peripheral portion of this end of seal element 26, the recess which forms lip 32 includes an elongated side 42 sub-stantially parallel to inner peripheral surface 28 and ex-20 tending from end surface 40 toward the opposite end of theseal element. Elongated surface 42 joins a radially inner end of a cross-sectionally S-shaped surface which connects on its other end with outer peripheral surface 30. An inner curved portion 44 of this S-shaped surface extends toward 25 seal element end 36 and the other curved portion 46 of this S-shaped surface extends in the opposite direction thereby forming lip 32. The S-shaped surface in its radially outer portion forms a portion of lip 32 and its radially inner portion forms an undercut of the material which comprises - 3~ the lip. The radial thickness of this undercut can be ap-proximately the same as the radial thickness of lip 32 in its thickest portion as shown in the drawings. This propor-tion will allow significant flexure of lip 32 and accomoda-tion for radial compression of the seal element to insure 35 proper sealing.
Fig. 5 shows in an enlarged view the sealing ele-ment groove in pump body 14. This groove is generally dove-tailed in its cross-sectional shape and includes a bottom surface which is parallel to the longitudinal axis of valve ' 1136667 body 14 and opposed sides, one of ~7hich extends to pump body outer surface 48 in a uniform fashion and the other of which extends to pump body outer surface 48 in a broken or two step fashion. Referring to the lower portion of Fig. 5, this shows the simplest groove side which includes a curved sur-face 50 connecting grooYe ~ottom surface 47 to an inclined groo~e side 52 that extends to pump body outer surface 48.
At the opposite side of the groove, another curved surface 54 connects groove bottom surface 47 with a short inclined 10 groove side 56 that terminates approximately at the mid-depth of the groove. Inclined groove side 56 is oriented in the opposite direction to incline groo~é side 52. Ano~her groove end surface 58 is inclined in the opposite direction to sur-face 56 and joins the radially outer end of groove side 56 15 and connects with pump body outer surface 48 in order to pro-vide a relief in that end portion of the sealing element groove which makes the dovetail feature in that side of the groove approximately one half the depth of the dovetail feature in the opposite side of the groove.
Fig. 5 shows seal element 26, in dashed lines, positioned in the sealing element groove. Seal element 26 is sized to fit within the confines of the dovetailed shaped groove wherein seal end surfaces 36 and 40 rest adjacent to groove sides 52 and 56 and inner peripheral seal surface 28 25 rests in adjacent to grooYe bottom surface 47. On the outerperiphery of seal element 26, outer peripheral surface 30 aligns with pump body outer surface 48 at the juncture of groove inclined side surface 52 and seal end surface 36.
Because seal element 26 is thicker through the portion ha~ing 30 lip 32, that portion of the seal element extends radially outward beyond the cylindrical plane or form defined by the pump body outer surface 48 and that portion of the seal is displaced upon installation of the pump body in pump housing 12.
Fig. 6 illustrates the seal element in a position it assumes when pump body 14 is mounted within pump housing 12 and fluid pressure is applied to the seal element from between the pump housing and pump body at the end of the seal with lip 32. Seal outer peripheral surface 30 is in flush ,,,,, , , _ , _ , . _, ~ _ _ ,, ., . . _, . , _ . _ . _ . .. .. ..... ... . . .. . . .. . . . . . . .. . .
.. . . .. .
~1366~i7 fluid tigh~ sealing contact with pump housing ~ore 24. Be-cause of the fluid pressure in the cavity between lip 32 and groove side 58, seal element 26 is urged generally toward the opposite side of the groove and the recess around the outer perimeter of the seal element can be deformed somewhat as shown in Fig. 6.
A feature of the seal assembly of this invention lies in the tapered construction of the seal element outer peripheral surface. This shape permits a seal element to be 10 easily slipped into pump housing bore 24 because the seal is gradually compressed as it is moved into bore 24 from a larger diameter portion of pump housing 12. Removal of the pump body and the seal from the pump housing is also assisted by the tapered construction because it provides less drag 15 when sliding over pump housing bore 24 than would a non-tapering or substantially constant diameter seal element.
In use of this seal assembly, it can seal when fluid pressure is applied from either direction; however, it is preferred that fluid pressure be applied toward the end having lip 32.
Another feature of the seal assembly of this in-vention is that the seal element is constructed of a material which is sufficiently resilient to enable it to be stretched over a pump housing and into place in the groove. This fea-ture overcomes the heretofore requirement of pump bodies to 25 be made in several separable segments. Because this seal assembly does not require a sectionalized separable pump housing, it makes simpler pump housing designs possible by eliminating threaded connections, etc. which are necessary to take them apart. Groove end surface 58 permits the seal 30 ring to be slipped easily into the groove by deforming the seal ring. To install the seal ring, it is simply slipped over the outer surface of the pump body and into the groove.
For use in the downhole hydraulic pump, the seal assembly of this invention has a definite advantage over the 35 seal assemblies previously used because it can be slipped over the pump body and positioned in the groove. Prior art constructions, discussed above, have multiple segment pump bodies that are separated at the seal groove because the seal elements have an encapsulated rigid support ring which cannot be stretched over ~he pump body. Because this seal element can be easily stretched over the pump body for installation, it simplifies the pump design and construction because it eliminates the need for joints in the pump body.
Although the seal assembly of this invention is shown with a downhole hydraulic pump,-it can obviously be used with other equipment where a seal of this nature is needed or desirable. For example, the seal assembly can be used where it is desired to seal between two conduits like 10 in couplings.
T'nis is a division of copending Canadian Patent Application Serial number 330,781, filed June 28, 1979.
Some pumps used in this oil well service are provided with some type of seal around the pump body to seal ~ithin - 10 portions of the pump housing. Typically these seals are constructed with a metal ring to provide sufficient radial strength and prevent their being dislodged from the pump body while the pump is-installed in or removed from the well.
Because these prior art seal constructions include a metal rina, the seal cannot be radially expanded and slipped over the pump body for installation. This construction necessitates the pump body being made in several separable sections to allow for installation of these seals. This multiple section construction complicates the manufacture of the pump body as well as requiring additional seals within the pump.
.,~. ... .
According to the present invention there is provided a seal assembly for sealin~g around a tubular member which is mounted within an opening in a housing or the like. The assembly includes a cross-sectional generally dovetail shaped groove around the tubular member with one side of the groove being dovetailed in the bottom portion only and having the outer portion of the side inclined in a divergent relation from the groove. An annular seal element is mounted within the aroove and extends therefrom and includes an inner portion contacting cg/ ~
: ; :
~136667 the bottom of the groove, ~n auter portion extends from the groove, and an outer peripheral sealinq surface is provided on the exterior of the seal element. The seal element has a lip formed at one end portion thereof by a recess around the outer perimeter thereof which undercuts a segment of the seal ring at that end portion thereof. The lip is shaped so that the fluid acting toward the end portion of the seal element havin~ the lip will urge the lip outward into sealin~ engagement with the housing.
One object of this invention is to provide a seal assembly overcoming the aforementioned disadvantaqes o the prior art devices.
Still an object of a specific embodiment of the invention is to provide a seal assembly for a do~hole oil well hydraulic pump which can be easily slipped over the pump body and held in place by the shape of the groove around the body.
It is also an object of a specific embodiment of the invention to provide a seal assembly for a hydraulic oil well pump which can withstand repeated assembly and disassembly by installing the pump body within the housing and removing it from the housing-without damage to the seal element.
Various other objects, advantages, and features of this invention will become apparent to those skilled in the art from the following discussion, taken in conjunction with the accompanying drawings, in which:
DESCRIPTION OF THE DRAWINGS
Fig. 1 is a cutaway pictorial elevation view of a segment of well casing having a hydraulically actuated down-hole pump housing and pump body mounted therein;
~- 2 -cg/~V
.:
113f~667 Fig. 2 is a cross-sectional elevation view of a seq-ment of a pump housing and a segment of a pump body having the seal assembly of thls invention with the seal element spaced from the entrance to the pump housing prior to instal-lation;
Fig. 3 is a cross-sectional elevation viéw of a segment of the pump housing and pump body shown in Fig. 2 with the seal assembly installed;
Fig. 4 is an enlarged cross-sectional elevation view 1~ of the seal element alone in a free position;
Fig. 5 is an enlarged cross-sectional elevation view of a segment of the pump body having the groove and with the seal element shown positioned therein in dashed lines; and Fig. 6 is an enlarged cross-sectional elevation view of a segment of the pump body and pump housing t~7ith the seal ring mounted therein showing the seal element with fluid pressure applied toward the seal from the upper portion of the figure or the end of the seal havin~ the recess.
- 2a -cg/~C~
'' ' " ' 1136667 The following is a discussion and description of preferred specific embodiments of the seal assembly of this invention, such being made with reference to the drawings, whereupon the same reference numerals are used to indicate the same or similar parts and/or structure. It is to be understood that such description and discussion is not to unduly limit the scope of the invention.
Detailed Description Referring to Fig. 1, such shows a downhole oil well 10 hydraulically actuated pump and employing the seal assemblies of this invention mounted within a segment of casing 10. The ~ pump consists of a pump housing 12 which is sealingly mounted within casing 10 and is hollow on the interior thereof to receive and mount the pump body 14 which contains the working 15 elements of the pump. Pump body 14 contains a pair of pis-tons 16 which are secured to opposite ends of a pump rod 18.
Pump rod 18 extends through a reversing valve assembly 20 which controls the motion of the pistons 16. Fluid passage-ways between pump body 14 and pump housing 12 are sealed by 20 a plurality of seal assemblies 22. The several seal assem-blies 22 are a plurality of the seal assembly of this inven-tion and provide seals at the points within the pump where fluid under pressure i5 transmitted between pump housing 12 and pump body 14.
Fig. 2 shows a segment of pump housing 12 and a segment of pump body 14 with seal assembly 22 around pump body 14 in a spaced relation to the pump housing bore 24 where it will ultimately reside when installed. Displacement of pump body 14 into its final resting position in pump hous-30 ing 12 positions the seal assembly within the confines of seal bore 24. Positioning seal assembly 22 at this location rad;ally compresses the seal element 26 to produce a fluid tight seal between pump body 14 and pump housing 12.
Fig. 4 shows seal element 26 in an enlarged cross-35 sectional view with the seal element in its undeformed or free state. Seal member 26 is constructed of a molded elastomeric compound andformed in the shown shape. The interior of seal element 2S has an inner peripheral surface 28 which is uniform in cross-section and substantially the 1~36667 same diameter as the bottom of the groove in which the seal element will be mounted. The exterior of seal element 26 has an outer peripheral surface 30 which is inclined relative to inner peripheral surface 28. A recess at one end of seal 5 element 26 around the outer periphery thereof forms a lip 32.
Outer peripheral surface 30 is inclined or tapered so the - portion of the seal element having lip 32 is at the greater thickness portion of the seal element. Seal end surface 36 is inclined relative to inner peripheral surface 28 and ori-10 ented to fit within the confines of the dovetail groovearound the valve body 14. Seal end surface 36 is smoothly curved to join seal inner peripheral surface 28 as shown.
Seal end surface 40 is angularly oriented to cor-respond with the internal shape of the dovetail groove in 15 valve body 14. Seal end surface 40 is smoothly curved to join seal inner peripheral surface 28 as shown. Around the outer peripheral portion of this end of seal element 26, the recess which forms lip 32 includes an elongated side 42 sub-stantially parallel to inner peripheral surface 28 and ex-20 tending from end surface 40 toward the opposite end of theseal element. Elongated surface 42 joins a radially inner end of a cross-sectionally S-shaped surface which connects on its other end with outer peripheral surface 30. An inner curved portion 44 of this S-shaped surface extends toward 25 seal element end 36 and the other curved portion 46 of this S-shaped surface extends in the opposite direction thereby forming lip 32. The S-shaped surface in its radially outer portion forms a portion of lip 32 and its radially inner portion forms an undercut of the material which comprises - 3~ the lip. The radial thickness of this undercut can be ap-proximately the same as the radial thickness of lip 32 in its thickest portion as shown in the drawings. This propor-tion will allow significant flexure of lip 32 and accomoda-tion for radial compression of the seal element to insure 35 proper sealing.
Fig. 5 shows in an enlarged view the sealing ele-ment groove in pump body 14. This groove is generally dove-tailed in its cross-sectional shape and includes a bottom surface which is parallel to the longitudinal axis of valve ' 1136667 body 14 and opposed sides, one of ~7hich extends to pump body outer surface 48 in a uniform fashion and the other of which extends to pump body outer surface 48 in a broken or two step fashion. Referring to the lower portion of Fig. 5, this shows the simplest groove side which includes a curved sur-face 50 connecting grooYe ~ottom surface 47 to an inclined groo~e side 52 that extends to pump body outer surface 48.
At the opposite side of the groove, another curved surface 54 connects groove bottom surface 47 with a short inclined 10 groove side 56 that terminates approximately at the mid-depth of the groove. Inclined groove side 56 is oriented in the opposite direction to incline groo~é side 52. Ano~her groove end surface 58 is inclined in the opposite direction to sur-face 56 and joins the radially outer end of groove side 56 15 and connects with pump body outer surface 48 in order to pro-vide a relief in that end portion of the sealing element groove which makes the dovetail feature in that side of the groove approximately one half the depth of the dovetail feature in the opposite side of the groove.
Fig. 5 shows seal element 26, in dashed lines, positioned in the sealing element groove. Seal element 26 is sized to fit within the confines of the dovetailed shaped groove wherein seal end surfaces 36 and 40 rest adjacent to groove sides 52 and 56 and inner peripheral seal surface 28 25 rests in adjacent to grooYe bottom surface 47. On the outerperiphery of seal element 26, outer peripheral surface 30 aligns with pump body outer surface 48 at the juncture of groove inclined side surface 52 and seal end surface 36.
Because seal element 26 is thicker through the portion ha~ing 30 lip 32, that portion of the seal element extends radially outward beyond the cylindrical plane or form defined by the pump body outer surface 48 and that portion of the seal is displaced upon installation of the pump body in pump housing 12.
Fig. 6 illustrates the seal element in a position it assumes when pump body 14 is mounted within pump housing 12 and fluid pressure is applied to the seal element from between the pump housing and pump body at the end of the seal with lip 32. Seal outer peripheral surface 30 is in flush ,,,,, , , _ , _ , . _, ~ _ _ ,, ., . . _, . , _ . _ . _ . .. .. ..... ... . . .. . . .. . . . . . . .. . .
.. . . .. .
~1366~i7 fluid tigh~ sealing contact with pump housing ~ore 24. Be-cause of the fluid pressure in the cavity between lip 32 and groove side 58, seal element 26 is urged generally toward the opposite side of the groove and the recess around the outer perimeter of the seal element can be deformed somewhat as shown in Fig. 6.
A feature of the seal assembly of this invention lies in the tapered construction of the seal element outer peripheral surface. This shape permits a seal element to be 10 easily slipped into pump housing bore 24 because the seal is gradually compressed as it is moved into bore 24 from a larger diameter portion of pump housing 12. Removal of the pump body and the seal from the pump housing is also assisted by the tapered construction because it provides less drag 15 when sliding over pump housing bore 24 than would a non-tapering or substantially constant diameter seal element.
In use of this seal assembly, it can seal when fluid pressure is applied from either direction; however, it is preferred that fluid pressure be applied toward the end having lip 32.
Another feature of the seal assembly of this in-vention is that the seal element is constructed of a material which is sufficiently resilient to enable it to be stretched over a pump housing and into place in the groove. This fea-ture overcomes the heretofore requirement of pump bodies to 25 be made in several separable segments. Because this seal assembly does not require a sectionalized separable pump housing, it makes simpler pump housing designs possible by eliminating threaded connections, etc. which are necessary to take them apart. Groove end surface 58 permits the seal 30 ring to be slipped easily into the groove by deforming the seal ring. To install the seal ring, it is simply slipped over the outer surface of the pump body and into the groove.
For use in the downhole hydraulic pump, the seal assembly of this invention has a definite advantage over the 35 seal assemblies previously used because it can be slipped over the pump body and positioned in the groove. Prior art constructions, discussed above, have multiple segment pump bodies that are separated at the seal groove because the seal elements have an encapsulated rigid support ring which cannot be stretched over ~he pump body. Because this seal element can be easily stretched over the pump body for installation, it simplifies the pump design and construction because it eliminates the need for joints in the pump body.
Although the seal assembly of this invention is shown with a downhole hydraulic pump,-it can obviously be used with other equipment where a seal of this nature is needed or desirable. For example, the seal assembly can be used where it is desired to seal between two conduits like 10 in couplings.
Claims (3)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A seal assembly for sealing around a tubular member which is mounted within an opening in a housing or the like, comprising:
(a) a cross-sectionally generally dovetail shaped groove around said tubular member with one side of said groove being dovetailed in the bottom portion only and having the outer por-tion of this side inclined in a divergent relation from said groove; and (b) an annular seal element mounted within said groove and extending therefrom, including an inner portion contacting the bottom of said groove, an outer portion extending from the groove, an outer peripheral sealing surface on the exterior of the seal element, and a lip formed at one end portion of the seal element by a recess around the outer perim-eter thereof which undercuts a segment of said seal ring at that end portion thereof, said lip being shaped so that fluid acting toward the end portion of the seal element having said lip will urge said lip outward into sealing engagement with said housing.
(a) a cross-sectionally generally dovetail shaped groove around said tubular member with one side of said groove being dovetailed in the bottom portion only and having the outer por-tion of this side inclined in a divergent relation from said groove; and (b) an annular seal element mounted within said groove and extending therefrom, including an inner portion contacting the bottom of said groove, an outer portion extending from the groove, an outer peripheral sealing surface on the exterior of the seal element, and a lip formed at one end portion of the seal element by a recess around the outer perim-eter thereof which undercuts a segment of said seal ring at that end portion thereof, said lip being shaped so that fluid acting toward the end portion of the seal element having said lip will urge said lip outward into sealing engagement with said housing.
2. The seal assembly of claim 1, wherein:
(a) said seal element has an inner surface which is substantially uniform in diameter and said outer peripheral sealing surface is inclined relative to said inner surface with said surfaces being farthest apart at the end of said seal element having said lip such that said seal element has a generally tapered from such that it can slip easily into said pump housing and be radially compressed into sealing contact between said pump body and said housing thereby holding said lip in fluid tight sealing contact with said housing;
and (b) said recess forming said lip is defined by a portion of said outer peripheral sealing sur-face located at a mid-portion of said seal which has a smoothly contoured curvature undercutting said lip such that the radial thickness of said lip is approximately one half the depth of said recess from said outer peripheral sealing surface.
(a) said seal element has an inner surface which is substantially uniform in diameter and said outer peripheral sealing surface is inclined relative to said inner surface with said surfaces being farthest apart at the end of said seal element having said lip such that said seal element has a generally tapered from such that it can slip easily into said pump housing and be radially compressed into sealing contact between said pump body and said housing thereby holding said lip in fluid tight sealing contact with said housing;
and (b) said recess forming said lip is defined by a portion of said outer peripheral sealing sur-face located at a mid-portion of said seal which has a smoothly contoured curvature undercutting said lip such that the radial thickness of said lip is approximately one half the depth of said recess from said outer peripheral sealing surface.
3. The seal assembly of claim 2, wherein said smoothly contoured curvature is defined by a cross-sectionally generally S-shaped surface which forms the unattached end of said lip and said undercut.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000392605A CA1136667A (en) | 1978-09-13 | 1981-12-17 | Seal assembly |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US942,092 | 1978-09-13 | ||
| US05/942,092 US4174112A (en) | 1978-09-13 | 1978-09-13 | Seal assembly |
| CA000330781A CA1134874A (en) | 1978-09-13 | 1979-06-28 | Seal assembly |
| CA000392605A CA1136667A (en) | 1978-09-13 | 1981-12-17 | Seal assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1136667A true CA1136667A (en) | 1982-11-30 |
Family
ID=27166316
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000392605A Expired CA1136667A (en) | 1978-09-13 | 1981-12-17 | Seal assembly |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1136667A (en) |
-
1981
- 1981-12-17 CA CA000392605A patent/CA1136667A/en not_active Expired
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4468042A (en) | Anti-extrusion sealing device with interlocked retainer portions | |
| RU2309316C2 (en) | Distance ring | |
| CA1170683A (en) | Metal seal assembly | |
| US4936197A (en) | Dynamic seal construction | |
| US4911245A (en) | Metal seal with soft inlays | |
| US6173964B1 (en) | Seal assembly with backup elements having coil springs positioned therein | |
| US6161834A (en) | Pressure energized seal | |
| US3813105A (en) | Seal | |
| JPS6065959A (en) | Seal ring for piston rod | |
| US2437814A (en) | Sealing means | |
| US20030111799A1 (en) | Seal for riser assembly telescoping joint | |
| CA2121178A1 (en) | Fs seal for a large diameter pipe | |
| US6343791B1 (en) | Split mesh end ring | |
| CA1134874A (en) | Seal assembly | |
| CA1158974A (en) | Seal assemblies and packer members therefor | |
| JPS63500469A (en) | Connection element for connecting the ends of hoses, in particular for coolant hoses of internal combustion engines | |
| CA1136667A (en) | Seal assembly | |
| US4900067A (en) | Retrievable packoff with an embedded flexible, metallic band | |
| US10138698B2 (en) | External locking mechanism for seal energizing ring | |
| US20030209857A1 (en) | Metal end cap seal with o-ring | |
| US5066029A (en) | Annular sealing apparatus | |
| US4071041A (en) | Ball valve seat ring construction | |
| US2553750A (en) | Packing ring | |
| GB2030238A (en) | Seal assembly | |
| US3223425A (en) | Slush pump piston rod packing assembly and packing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |