CA1158273A - Mechanical seal assembly - Google Patents
Mechanical seal assemblyInfo
- Publication number
- CA1158273A CA1158273A CA000387097A CA387097A CA1158273A CA 1158273 A CA1158273 A CA 1158273A CA 000387097 A CA000387097 A CA 000387097A CA 387097 A CA387097 A CA 387097A CA 1158273 A CA1158273 A CA 1158273A
- Authority
- CA
- Canada
- Prior art keywords
- seal
- rotatable
- jacket
- retainer
- rings
- 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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/36—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member connected by a diaphragm or bellow to the other member
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mechanical Sealing (AREA)
Abstract
078257-BJ(V) MECHANICAL SEAL ASSEMBLY
Abstract:
A mechanical seal assembly (10) especially adaptable for use in the chemical industry in which a jacket (36) impervious to the chemical involved surrounds a spring means (24) which urges the seal faces (20,22) toward one another, the spring being capable of transmitting torque and provides axial support to the jacket.
Abstract:
A mechanical seal assembly (10) especially adaptable for use in the chemical industry in which a jacket (36) impervious to the chemical involved surrounds a spring means (24) which urges the seal faces (20,22) toward one another, the spring being capable of transmitting torque and provides axial support to the jacket.
Description
ME~e~llCAI ~ MBLY
Descrlption Mechanical sPal assemblies for sealing fluids from each other and associated with a stationary housing and a rotatable shaft are well known in the art. The housing may house a pump impeller connected to ~he rotatable shaft. To substantially eliminate leakage of the pump fluid from the housing, a mechanical seal assembly is used. Generally these mechanical seal assemblies comprise a seal ring connected to the housing and a seal ring connected to the shaft, the rings having opposing seal faces one or both of which are resiliently urged toward the other. Such construction can leave the resilient means exposed to one of the fluids - i.e., 1) fluid being pumped and 2) air or other fluid. ]:f the fluid being pumped is chemically active, it can corrode and damage the resilient means and/or other par~s of the assembly.
A mechanical seal assembly is disclosed herein constructed especially for use in chemical applications where corrosive fluids are handled and in which a chemically impervious covering is used to protec~
various parts of the assembly from contact with the corrosive fluids. Speci~ically, the assembly comprises a conventional rotatable and stationary seal rings of ~5~273 a coil spring for urging -the rings toward one another.
Preferably, a heat shrinkable plastic tubing surrounds the spring and is sealed at one end of the spring retainer and at the other end to a seal ring, the tubing being of a fluor-ethylene-propylene material. Other elastomers may be used to encase the spring, in which case other methods of joining the sleeve or jacket to the end pieces would be necessary.
Therefore, in accordance with the present invention there is provided a mechanical seal assembly especlally adaptable for use in the chemical industry which is associated with a rotatable shaft and a stationary housing which may contain chemically active fluid. The assembly comprises a stationary sealing ring associated with the housing, a rotatable sealing ring associated with the shaft, the sealing rings having seal faces opposed to one another, a retainer connected to the shaft, resilient means connected at one end to one of the seal rings and at its other end to the retainer for urging the one of the seal rings toward the other of the seal rings, fluid impervious means surrounding, separate from and supported by the outside of the resilient means for protecting the resilient means from the chemically active fluid. The fluid impervious means comprising a jacket of shrinkable plastic shrunk onto the resilient means. The assembly further includes means encircling the jacket and sealing the ends thereof to one of the seal rings and to the retainer.
The single figure is a longitudinal, partial sectional view of a mechanical seal assembly according to this invention.
The mechanical seal assembly is generally identified as 10 and comprises a stationary seal ring 12 sealed to a
Descrlption Mechanical sPal assemblies for sealing fluids from each other and associated with a stationary housing and a rotatable shaft are well known in the art. The housing may house a pump impeller connected to ~he rotatable shaft. To substantially eliminate leakage of the pump fluid from the housing, a mechanical seal assembly is used. Generally these mechanical seal assemblies comprise a seal ring connected to the housing and a seal ring connected to the shaft, the rings having opposing seal faces one or both of which are resiliently urged toward the other. Such construction can leave the resilient means exposed to one of the fluids - i.e., 1) fluid being pumped and 2) air or other fluid. ]:f the fluid being pumped is chemically active, it can corrode and damage the resilient means and/or other par~s of the assembly.
A mechanical seal assembly is disclosed herein constructed especially for use in chemical applications where corrosive fluids are handled and in which a chemically impervious covering is used to protec~
various parts of the assembly from contact with the corrosive fluids. Speci~ically, the assembly comprises a conventional rotatable and stationary seal rings of ~5~273 a coil spring for urging -the rings toward one another.
Preferably, a heat shrinkable plastic tubing surrounds the spring and is sealed at one end of the spring retainer and at the other end to a seal ring, the tubing being of a fluor-ethylene-propylene material. Other elastomers may be used to encase the spring, in which case other methods of joining the sleeve or jacket to the end pieces would be necessary.
Therefore, in accordance with the present invention there is provided a mechanical seal assembly especlally adaptable for use in the chemical industry which is associated with a rotatable shaft and a stationary housing which may contain chemically active fluid. The assembly comprises a stationary sealing ring associated with the housing, a rotatable sealing ring associated with the shaft, the sealing rings having seal faces opposed to one another, a retainer connected to the shaft, resilient means connected at one end to one of the seal rings and at its other end to the retainer for urging the one of the seal rings toward the other of the seal rings, fluid impervious means surrounding, separate from and supported by the outside of the resilient means for protecting the resilient means from the chemically active fluid. The fluid impervious means comprising a jacket of shrinkable plastic shrunk onto the resilient means. The assembly further includes means encircling the jacket and sealing the ends thereof to one of the seal rings and to the retainer.
The single figure is a longitudinal, partial sectional view of a mechanical seal assembly according to this invention.
The mechanical seal assembly is generally identified as 10 and comprises a stationary seal ring 12 sealed to a
- 2 ~
multiple part housing 14 by an O-ring 16 and a rotatable seal ring 18 the rings 12 and 18 having opposed seal faces 20 and 22, respectively. The seal ring 18 is urged toward the seal ring 12 by a coil spring 24, one end of which surrounds and frictionally engages a reduced portion of the ring 18 and the other end of which surrounds and frictionally engages a reduced portion 20 of a spring retainer 30, the latter being adapted to be connected to a rotatable shaft 32 by a set screw 34 and sealed thereto by an O ring 35. Because of the connection of the retainer 30 with the shaft 32 and the spring 24, the seal ring 18 is rotatable with the shaft 32.
A sleeve or jacket 36 surrounds the spring 24 and extends over parts of the seal ring 18 and the spring retainer 30. One end of the sleeve 36 is received in an annular groove 38 in the ring 18 and is fixed therein by an O-ring 40. The other end - 2a -of the sleeve 36 is received in an annular groove 42 in the retainer 30 and is fixed therein by an O-ring 44.
Preferably the sleeve 36 comprises a heat shrinkable tubing of a fluor-ethylene-propylene (FEP). A portion of the seal 10 can be constructed as a cartridge, i.e., a retainer 30, a seal xing 18 and a spring can be assembled in a mandrel.
A length of FEP tubing is slipped over the assembled parts followed by assemblying the O-rings 40 and 44 in the appropriate grooves 38, and 42, respectively.
Warm air is then directed onto the tubing which causes it to shrink and assume the shape as shown in the drawi~g. The parts can then be removed from the mandrel for future assembly with a seal ring 12.
For high pressure uses, multiple ply sleeves or jackets can be used.
It is to be understood that other elastomers may be used to encase the spring 24, in which case other methods of joining the sleeve or jacket to the end pieces would be necessary. The spring 24 serves to radially support the sleeve or jacket and enables the seal assembly to be used at much higher pressures than in the absence of such radial support.
multiple part housing 14 by an O-ring 16 and a rotatable seal ring 18 the rings 12 and 18 having opposed seal faces 20 and 22, respectively. The seal ring 18 is urged toward the seal ring 12 by a coil spring 24, one end of which surrounds and frictionally engages a reduced portion of the ring 18 and the other end of which surrounds and frictionally engages a reduced portion 20 of a spring retainer 30, the latter being adapted to be connected to a rotatable shaft 32 by a set screw 34 and sealed thereto by an O ring 35. Because of the connection of the retainer 30 with the shaft 32 and the spring 24, the seal ring 18 is rotatable with the shaft 32.
A sleeve or jacket 36 surrounds the spring 24 and extends over parts of the seal ring 18 and the spring retainer 30. One end of the sleeve 36 is received in an annular groove 38 in the ring 18 and is fixed therein by an O-ring 40. The other end - 2a -of the sleeve 36 is received in an annular groove 42 in the retainer 30 and is fixed therein by an O-ring 44.
Preferably the sleeve 36 comprises a heat shrinkable tubing of a fluor-ethylene-propylene (FEP). A portion of the seal 10 can be constructed as a cartridge, i.e., a retainer 30, a seal xing 18 and a spring can be assembled in a mandrel.
A length of FEP tubing is slipped over the assembled parts followed by assemblying the O-rings 40 and 44 in the appropriate grooves 38, and 42, respectively.
Warm air is then directed onto the tubing which causes it to shrink and assume the shape as shown in the drawi~g. The parts can then be removed from the mandrel for future assembly with a seal ring 12.
For high pressure uses, multiple ply sleeves or jackets can be used.
It is to be understood that other elastomers may be used to encase the spring 24, in which case other methods of joining the sleeve or jacket to the end pieces would be necessary. The spring 24 serves to radially support the sleeve or jacket and enables the seal assembly to be used at much higher pressures than in the absence of such radial support.
Claims (4)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A mechanical seal assembly especially adaptable for use in the chemical industry and which is associated with a rota-table shaft and a stationary housing which may contain chemically active fluid, comprising:
a stationary sealing ring associated with said housing;
a rotatable sealing ring associated with said shaft;
said sealing rings having seal faces opposed to one another;
a retainer connected to said shaft;
resilient means connected at one end to one of said seal rings and at its other end to said retainer for urging said one of said seal rings toward the other of said seal rings;
fluid impervious means surrounding, separate from and supported by the outside of said resilient means for protecting said resilient means from said chemically active fluid;
said fluid impervious means comprising a jacket of shrinkable plastic shrunk onto said resilient means; and means encircling said jacket and sealing the ends thereof to one of said seal rings and to said retainer.
a stationary sealing ring associated with said housing;
a rotatable sealing ring associated with said shaft;
said sealing rings having seal faces opposed to one another;
a retainer connected to said shaft;
resilient means connected at one end to one of said seal rings and at its other end to said retainer for urging said one of said seal rings toward the other of said seal rings;
fluid impervious means surrounding, separate from and supported by the outside of said resilient means for protecting said resilient means from said chemically active fluid;
said fluid impervious means comprising a jacket of shrinkable plastic shrunk onto said resilient means; and means encircling said jacket and sealing the ends thereof to one of said seal rings and to said retainer.
2. A mechanical seal assembly as recited in Claim 1, wherein said resilient means comprises a coil spring.
3. A mechanical seal assembly as recited in Claim 2, wherein said encircling means comprises O-rings and said resilient means is connected at one end to said rotatable seal ring.
4. A mechanical seal assembly especially adaptable for use with chemically active fluids and comprising:
a stationary seal ring adapted to be connected to a housing;
a rotatable seal ring adapted to be connected to a rotatable shaft;
said seal rings having faces opposed to one another;
a coil spring urging said rotatable seal ring toward said stationary seal ring;
a retainer adapted to be connected to the rotatable shaft for positioning one end of said spring;
a fluid impervious jacket surrounding and separate from and supported by the outside of said spring; and means sealing the ends of said jacket to said retainer and said rotatable seal ring, said fluid impervious jacket comprising a fluour-ethylene-propylene plastic shrunk onto said spring;
said means sealing the ends of said jacket to said retainer and said rotatable seal ring comprising O-rings around said jacket and received in grooves in said retainer and said rotatable seal ring, respectively.
a stationary seal ring adapted to be connected to a housing;
a rotatable seal ring adapted to be connected to a rotatable shaft;
said seal rings having faces opposed to one another;
a coil spring urging said rotatable seal ring toward said stationary seal ring;
a retainer adapted to be connected to the rotatable shaft for positioning one end of said spring;
a fluid impervious jacket surrounding and separate from and supported by the outside of said spring; and means sealing the ends of said jacket to said retainer and said rotatable seal ring, said fluid impervious jacket comprising a fluour-ethylene-propylene plastic shrunk onto said spring;
said means sealing the ends of said jacket to said retainer and said rotatable seal ring comprising O-rings around said jacket and received in grooves in said retainer and said rotatable seal ring, respectively.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US19696780A | 1980-10-14 | 1980-10-14 | |
| US196,967 | 1980-10-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1158273A true CA1158273A (en) | 1983-12-06 |
Family
ID=22727491
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000387097A Expired CA1158273A (en) | 1980-10-14 | 1981-10-01 | Mechanical seal assembly |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS5790463A (en) |
| CA (1) | CA1158273A (en) |
| DE (1) | DE3139193C2 (en) |
| FR (1) | FR2492035A1 (en) |
| GB (1) | GB2085982B (en) |
| NL (1) | NL186596C (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT380073B (en) * | 1983-02-10 | 1986-04-10 | Steyr Daimler Puch Ag | PISTON PISTON ENGINE |
| GB2155120B (en) * | 1984-03-03 | 1987-08-19 | Crane Packing Ltd | Mechanical face seal |
| GB8405628D0 (en) * | 1984-03-03 | 1984-04-04 | Crane Packing Ltd | Mechanical face seals |
| FR2610688B1 (en) * | 1987-02-10 | 1990-06-01 | Cyclam | WATERTIGHT RING |
| JP2007322594A (en) * | 2006-05-31 | 2007-12-13 | Pilot Ink Co Ltd | Color changeable self-adhesive label, and color changeable article using the same |
| DE102016212686A1 (en) * | 2016-07-12 | 2018-01-18 | Thyssenkrupp Ag | Bellows assembly and bellows for vehicles |
| US20190277406A1 (en) * | 2016-11-16 | 2019-09-12 | Eagle Industry Co., Ltd. | Mechanical seal |
| DE102022130415A1 (en) * | 2022-11-17 | 2024-05-23 | Eagleburgmann Germany Gmbh & Co. Kg | Mechanical seal arrangement |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2207371A (en) * | 1938-03-02 | 1940-07-09 | Gen Motors Corp | Fluid sealing device |
| GB606316A (en) * | 1946-01-26 | 1948-08-11 | William Murray | Improvements in and relating to seals for shafts and the like |
| DE931990C (en) * | 1954-02-24 | 1955-08-22 | Georg Dr-Ing Volland | Slip ring seal |
| JPS4734058B1 (en) * | 1969-05-22 | 1972-08-29 | ||
| FR2215123A5 (en) * | 1972-12-22 | 1974-08-19 | Pontigny Jacques | |
| DE2518990A1 (en) * | 1975-04-29 | 1976-11-11 | Mauz & Pfeiffer Progress | Suction hose with built-in electric conductors for vacuum cleaners - mfrd. in one step by extrusion has guide ducts for the conductors |
| DE7541268U (en) * | 1975-12-24 | 1976-05-26 | Metallschlauch-Fabrik Pforzheim, (Vorm. Hch. Witzenmann) Gmbh, 7530 Pforzheim | FLEXIBLE CONNECTION DEVICE FOR PIPES TO BE INSTALLED IN THE GROUND |
| DE2824612A1 (en) * | 1978-06-05 | 1979-12-06 | Bbc Brown Boveri & Cie | Mounting ptfe fittings onto plastics or metal machine parts - e.g. padding rings onto axles by heating to increase inner diameter, slipping onto shaft, and cooling slowly |
-
1981
- 1981-09-28 GB GB8129242A patent/GB2085982B/en not_active Expired
- 1981-10-01 CA CA000387097A patent/CA1158273A/en not_active Expired
- 1981-10-02 DE DE19813139193 patent/DE3139193C2/en not_active Expired
- 1981-10-07 NL NL8104557A patent/NL186596C/en not_active IP Right Cessation
- 1981-10-12 JP JP56162573A patent/JPS5790463A/en active Granted
- 1981-10-12 FR FR8119197A patent/FR2492035A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| NL186596C (en) | 1991-01-02 |
| JPH0155354B2 (en) | 1989-11-24 |
| DE3139193A1 (en) | 1982-04-29 |
| FR2492035A1 (en) | 1982-04-16 |
| DE3139193C2 (en) | 1983-09-01 |
| JPS5790463A (en) | 1982-06-05 |
| NL8104557A (en) | 1982-05-03 |
| NL186596B (en) | 1990-08-01 |
| FR2492035B1 (en) | 1985-03-08 |
| GB2085982B (en) | 1984-03-14 |
| GB2085982A (en) | 1982-05-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |