US3589738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanical seal for pulp pumps
Assignee: BW IP International Inc
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Filing: 1969-06-13
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Granted: 1971-06-29
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Expires: 1989-06-13
Abstract
Abstract A mechanical seal assembly for paper pulp pumps in which clean fluid flows between the seal faces and flushes the pulp from the seal assembly. Such an assembly in which fluid also flows along the outer periphery of the seal rings.
Inventors
- 👤 Herbert E Tracy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:50
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/3404; F16J15/3408; F16J15/3412; F16J15/342
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
220 words
A mechanical seal assembly comprising: a stuffing box, a shaft rotatable in said stuffing box, mechanical seal means for sealing said shaft in said stuffing box, said mechanical seal means including a stationary support, a stationary seal ring carried by said support and disposed about said shaft, a rotary seal ring disposed about said shaft, said stationary seal ring and said rotary seal ring having radial seal faces disposed in opposed sealing relation, a spring carrier having an annular body portion disposed about said shaft and an annular skirt portion radially spaced from the outer periphery of said shaft, said rotary seal ring being slidably disposed between said shaft and said skirt, said shaft, said body portion, said skirt and said rotary seal ring defining a substantially closed chamber, means providing a seal between said skirt portion and the outer periphery of said rotary seal ring, means providing a seal between the inner periphery of said rotary seal ring and said shaft, spring means within said chamber, carried by said spring carrier and engaged with said rotary seal ring to bias the latter toward said stationary seal ring, fluid pressure orifice means communicating said chamber with the interior of the stuffing box surrounding said spring carrier, and fluid passage means for conducting a flushing fluid between said radial seal faces.
Claim 2
Dependent Claim
220 words
A mechanical seal assembly comprising: a stuffing box, a shaft rotatable in said stuffing box, mechanical seal means for sealing said shaft in said stuffing box, said mechanical seal means including a stationary support, a stationary seal ring carried by said support and disposed about said shaft, a rotary seal ring disposed about said shaft, said stationary seal ring and said rotary seal ring having radial seal faces disposed in opposed sealing relation, a spring carrier having an annular body portion disposed about said shaft and an annular skirt portion radially spaced from the outer periphery of said shaft, said rotary seal ring being slidably disposed between said shaft and said skirt, said shaft, said body portion, said skirt and said rotary seal ring defining a substantially closed chamber, means providing a seal between said skirt portion and the outer periphery of said rotary seal ring, means providing a seal between the inner periphery of said rotary seal ring and said shaft, spring means within said chamber, carried by said spring carrier and engaged with said rotary seal ring to bias the latter toward said stationary seal ring, fluid pressure orifice means communicating said chamber with the interior of the stuffing box surrounding said spring carrier, and fluid passage means for conducting a flushing fluid between said radial seal faces.
Claim 3
Dependent Claim
25 words
A mechanical seal assembly as defined in claim 1 wHerein said fluid pressure orifice means comprises a gap between said body portion and said shaft.
Claim 4
Dependent Claim
47 words
A mechanical seal assembly as defined in claim 1 wherein the outer periphery of said spring carrier is tapered so as to provide between said outer periphery of the spring carrier and the inner periphery of said stuffing box a divergent space for flow of flushing fluid.
Claim 5
Dependent Claim
17 words
A mechanical seal assembly as defined in claim 1 wherein said chamber is packed with a lubricant.
Claim 6
Dependent Claim
92 words
A mechanical seal assembly as defined in claim 1 wherein said body portion and the inner end of said rotary seal ring define the end walls of said chamber, a drive pin having one end affixed to one of said end walls and the other end slidingly and drivingly engaged with the other of said end walls, a setscrew extending radially through a wall of said spring carrier in driving engagement with said shaft, whereby said shaft, said spring carrier and said rotary seal ring are engaged for rotary movement in concert.
Claim 7
Dependent Claim
59 words
A mechanical seal assembly as defined in claim 1 wherein said stationary support has a bore, said stationary seal ring is disposed in said bore, said stationary seal ring and the wall of said bore providing an annular path opening into said stuffing box, and means for conducting additional flushing fluid into said stuffing box through said annular path.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |