US3749522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prevention of infiltration of gas bubbles into slurry pump parts
Assignee: Mitsubishi Shindoh Co Ltd
•
Filing: 1971-04-19
•
Granted: 1973-07-31
•
Expires: 1991-04-19
Abstract
Abstract In a slurry pump of liquid-diaphragm type having a diaphragm chamber containing a portion of slurry being pumped and a lighter diaphragm liquid, gas bubbles existing in large concentration in the slurry are prevented from infiltrating into the diaphragm chamber by the injection of a seal liquid without bubbles into the slurry in the chamber to cause a flow of liquid counter to the direction of infiltration of the gas bubbles. For this purpose, a seal-liquid-injection pipe is installed in the slurry in the chamber and supplied by a pump with the seal liquid from a reservoir through a check valve.
Inventors
- 👤 T Kazama
- 👤 K Sek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:18
CPC Classifications
F; F04; F04B; F04B53/00; F04B53/14; F04B53/141; Y; Y10; Y10S; Y10S417/00; Y10S417/90
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
74 words
For use in a slurry pump of the type having a liquiddiaphragm chamber containing in operation a slurry and a diaphragm liquid in contact therewith defining an interface therebetween, a method of preventing gas bubbles entrained in said slurry from infiltrating into said diaphragm liquid comprising injecting a seal liquid without gas bubbles into the slurry in said chamber to create a liquid flow counter to the direction of said infiltration of gas bubbles.
Claim 2
Dependent Claim
74 words
For use in a slurry pump of the type having a liquiddiaphragm chamber containing in operation a slurry and a diaphragm liquid in contact therewith defining an interface therebetween, a method of preventing gas bubbles entrained in said slurry from infiltrating into said diaphragm liquid comprising injecting a seal liquid without gas bubbles into the slurry in said chamber to create a liquid flow counter to the direction of said infiltration of gas bubbles.
Claim 3
Dependent Claim
24 words
A method as claimed in claim 1 in which said seal liquid is the mother liquor without gas bubbles of the slurry being pumped.
Claim 4
Dependent Claim
118 words
In a slurry pump of the type having a liquid-diaphragm chamber containing in operation a slurry and a diaphragm liquid in contact therewith defining an interface therebetween, an apparatus for preventing gas bubbles entrained in said slurry from in filtrating the diaphragm liquid, said apparatus comprising a reservoir containing a seal liquid without gas bubbles, liquid-injection means for injecting said seal liquid into the slurry in the liquid-diaphragm chamber, means defining a flow path from said reservoir to said liquid-injection means, liquid-transfer means for transferring seal liquid from said reservoir through said flow path to said liquid-injection means, and a check valve disposed between the liquid-transfer means and liquid-injection means for preventing reverse flow in said flow path.
Claim 5
Dependent Claim
118 words
In a slurry pump of the type having a liquid-diaphragm chamber containing in operation a slurry and a diaphragm liquid in contact therewith defining an interface therebetween, an apparatus for preventing gas bubbles entrained in said slurry from in filtrating the diaphragm liquid, said apparatus comprising a reservoir containing a seal liquid without gas bubbles, liquid-injection means for injecting said seal liquid into the slurry in the liquid-diaphragm chamber, means defining a flow path from said reservoir to said liquid-injection means, liquid-transfer means for transferring seal liquid from said reservoir through said flow path to said liquid-injection means, and a check valve disposed between the liquid-transfer means and liquid-injection means for preventing reverse flow in said flow path.
Claim 6
Dependent Claim
23 words
Apparatus as claimed in claim 3 in which said seal liquid is the mother liquor without gas bubbles of the slurry being pumped.
Claim 7
Dependent Claim
52 words
Apparatus as claimed in claim 3 in which there are provided detecting means for detecting the concentration of gas bubbles in the slurry in the liquid-diaphragm chamber to generate corresponding signals and control means operating in response to said signals to control the flowrate of the seal liquid through the flow path.
Claim 8
Dependent Claim
90 words
In combination, a slurry pump having a liquid-diaphragm chamber for containing in operation a slurry and a diaphragm liquid thereabove defining an interface therebetween, an apparatus for preventing gas in a gaseous phase entrained in said slurry from infiltrating into said diaphragm liquid, said apparatus comprising means to apply under pressure a seal liquid free of entrained gases to said slurry in said liquid-diaphragm chamber in a counter flow path directed away from said interface and in an area effective to substantially prevent infiltration of said gas into said interface.
Claim 9
Dependent Claim
90 words
In combination, a slurry pump having a liquid-diaphragm chamber for containing in operation a slurry and a diaphragm liquid thereabove defining an interface therebetween, an apparatus for preventing gas in a gaseous phase entrained in said slurry from infiltrating into said diaphragm liquid, said apparatus comprising means to apply under pressure a seal liquid free of entrained gases to said slurry in said liquid-diaphragm chamber in a counter flow path directed away from said interface and in an area effective to substantially prevent infiltration of said gas into said interface.
Claim 10
Dependent Claim
50 words
Apparatus as claimed in claim 6, in which said means for applying said seal liquid compRises a reservoir containing said seal liquid, liquid-injection means for injecting said seal liquid into said slurry in said liquid-diaphragm chamber, liquid-transfer means to supply said seal liquid from said reservoir to said liquid-injection means.
Claim 11
Dependent Claim
27 words
Apparatus as claimed in claim 7, including a check valve disposed between said liquid-transfer means and said liquid-injection means to prevent reverse flow toward said liquid-transfer means.
Claim 12
Dependent Claim
39 words
Apparatus as claimed in claim 7, including sensing means detecting the concentration of said gas entrained in said slurry, control means responsive to said sensing means to control the flow rate of said seal liquid to said liquid-injection means.
Claim 13
Dependent Claim
18 words
Apparatus as claimed in claim 6, in which said seal liquid comprises the component liquid of said slurry.
Claim 14
Dependent Claim
92 words
For use in conjunction with a slurry pump having a liquid-diaphragm chamber for containing in operation slurry and a diaphragm liquid thereabove defining an interface therebetween, an apparatus for preventing gas in a gaseous phase entrained in said slurry from infiltrating into said diaphragm liquid, said apparatus comprising means to apply under pressure a seal liquid free of entrained gases to said slurry in said liquid-diaphragm chamber in a counter flow path directed away from said interface and in an area effective to substantially prevent infiltration of said gas into said interface.
Claim 15
Dependent Claim
92 words
For use in conjunction with a slurry pump having a liquid-diaphragm chamber for containing in operation slurry and a diaphragm liquid thereabove defining an interface therebetween, an apparatus for preventing gas in a gaseous phase entrained in said slurry from infiltrating into said diaphragm liquid, said apparatus comprising means to apply under pressure a seal liquid free of entrained gases to said slurry in said liquid-diaphragm chamber in a counter flow path directed away from said interface and in an area effective to substantially prevent infiltration of said gas into said interface.
Claim 16
Dependent Claim
19 words
The apparatus as claimed in claim 11, in which said seal liquid comprises the component liquid of said slurry.
Claim 17
Dependent Claim
52 words
The apparatus as claimed in claim 11, in which said means for applying said seal liquid comprises a reservoir containing said seal liquid, liquid-injection means for injecting said seal liquid into said slurry in said liquid-diaphragm chamber, and liquid-transfer means to supply said seal liquid from said reservoir to said liquid-injection means.
Claim 18
Dependent Claim
28 words
The apparatus as claimed in claim 13, including a check valve disposed between said liquid-transfer means and said liquid-injection means to prevent reverse flow toward said liquid-transfer means.
Claim 19
Dependent Claim
40 words
The apparatus as claimed in claim 13, including sensing means detecting the concentration of said gas entrained in said slurry, control means responsive to said sensing means to control the flow rate of said seal liquid to said liquid-injection means.
Claim 20
Independent Claim
68 words
A method of preventing infiltration of gas bubbles into a liquid defining an interface with a mixture of a liquid with insoluble matter comprising, applying a seal liquid free of bubbles under pressure to said mixture in the vicinity of said interface as a counter flow directed to flow away from said interface and in an area effective to substantially prevent infiltration of said gas into said interface.
Claim 21
Independent Claim
68 words
A method of preventing infiltration of gas bubbles into a liquid defining an interface with a mixture of a liquid with insoluble matter comprising, applying a seal liquid free of bubbles under pressure to said mixture in the vicinity of said interface as a counter flow directed to flow away from said interface and in an area effective to substantially prevent infiltration of said gas into said interface.
Claim 22
Dependent Claim
20 words
A method as claimed in claim 16, in which said seal liquid comprises the component liquid of said liquid mixture.
Claim 23
Dependent Claim
88 words
For use in a slurry pump having a liquid-diaphragm chamber for containing in operation a slurry and a diaphragm liquid thereabove defining an interface therebetween, a method of preventing gas bubbles entrained in said slurry from infiltrating into said diaphragm liquid comprising, applying under pressure a seal liquid free of bubbles to said slurry in said liquid-diaphragm chamber in the vicinity of said interface and directed to flow away from said interface and in an area effective to substantially prevent infiltration of said gas bubbles into said interface.
Claim 24
Dependent Claim
88 words
For use in a slurry pump having a liquid-diaphragm chamber for containing in operation a slurry and a diaphragm liquid thereabove defining an interface therebetween, a method of preventing gas bubbles entrained in said slurry from infiltrating into said diaphragm liquid comprising, applying under pressure a seal liquid free of bubbles to said slurry in said liquid-diaphragm chamber in the vicinity of said interface and directed to flow away from said interface and in an area effective to substantially prevent infiltration of said gas bubbles into said interface.
Claim 25
Dependent Claim
19 words
A method as claimed in claim 18, in which said seal liquid comprises the component liquid of said slurry.
References Cited (Backward Citations)
US3241496A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |