Patent US4065237A successfully refreshed from Google Patents.
US4065237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve apparatus for expansible chamber
Assignee: Campbell Hausfeld LLC
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Filing: 1976-05-17
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Granted: 1977-12-27
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Expires: 1996-05-17
Abstract
Abstract Improved valve apparatus for expansible chamber devices, such as reciprocating piston compressors, includes in a preferred embodiment, a chamber having two chamber intake ports, each normally closed by a respective valve member. A first valve member is biased to close a first port, and a second member is more forcefully biased to close a second port which is larger in cross-sectional area than the first port. The first valve member opens the first port in response to an intake pressure differential less than that which will open the second port. Subsequently, and upon increased intake pressure differential, the second valve member opens the second port and reduces the working pressure affecting the first valve. This permits the first valve to positively close its port at or near the end of the suction stroke of the piston, the second valve also closing its port due to the more forceful bias. Reverse "gushing" is thereby significantly reduced and minimized, or totally prevented, while at the same time, initial intake is facilitated to reduce or eliminate starving. Valve plates and inlet restrictors are eliminated, and overall output and efficiency are significantly improved. The valving apparatus of the invention may also be used in connection with chamber exhaust for further increased efficiency.
Inventors
- 👤 Walter J. Webb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:46
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/14; F16K15/16; F04; F04B; F04B39/00; F04B39/10; F04B39/1073; F16K15/1401; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7839
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
160 words
In an expansible compression chamber apparatus operatively connected to intake means and to exhaust means, and having an expansible chamber defined in part by a cylinder head, an improved intake valve apparatus connecting said chamber to a common pressure fluid source and comprising: two laterally spaced intake ports in said head defining said intake means, said ports operatively connected to said expansible compression chamber and through which a fluid to be compressed is introduced into said chamber from said common pressure fluid source, a first valve member disposed and biased to normally positively close one intake port, said first valve member opening said one port in response to a first intake pressure differential, and a second valve member spaced from the first valve member and disposed and biased to normally positively close another of said intake ports, said second valve member opening said other port in response to a second intake pressure differential different from said first intake pressure differential.
Claim 2
Dependent Claim
160 words
In an expansible compression chamber apparatus operatively connected to intake means and to exhaust means, and having an expansible chamber defined in part by a cylinder head, an improved intake valve apparatus connecting said chamber to a common pressure fluid source and comprising: two laterally spaced intake ports in said head defining said intake means, said ports operatively connected to said expansible compression chamber and through which a fluid to be compressed is introduced into said chamber from said common pressure fluid source, a first valve member disposed and biased to normally positively close one intake port, said first valve member opening said one port in response to a first intake pressure differential, and a second valve member spaced from the first valve member and disposed and biased to normally positively close another of said intake ports, said second valve member opening said other port in response to a second intake pressure differential different from said first intake pressure differential.
Claim 3
Dependent Claim
15 words
Apparatus as in claim 1 wherein said expansible compression chamber comprises a driven air compressor.
Claim 4
Dependent Claim
23 words
Apparatus as in claim 1 wherein opening of said second port reduces the intake pressure differential otherwise exerted on said first valve member.
Claim 5
Dependent Claim
45 words
Apparatus as in claim 1 wherein said valve members are flapper valves, wherein said ports are disposed in a head member defining a portion of said expansible compression chamber, and wherein said head includes flapper valve recesses, said flapper valves being disposed in said recesses.
Claim 6
Dependent Claim
32 words
Apparatus as in claim 1 wherein said first and second valve members positively close said intake ports in sufficient time to minimize fluid from exhausting from said chamber through said intake ports.
Claim 7
Dependent Claim
20 words
Apparatus as in claim 1 wherein said first intake port is smaller in cross-sectional area than said second intake port.
Claim 8
Dependent Claim
12 words
Apparatus as in claim 6 wherein said valve members are flapper valves.
Claim 9
Dependent Claim
17 words
Apparatus as in claim 7 wherein said first flapper valve is thinner than said second flapper valve.
Claim 10
Dependent Claim
30 words
Apparatus as in claim 8 wherein said first port is circular and about 3/8 inches in diameter and wherein said second port is circular and about 1/2 inch in diameter.
Claim 11
Dependent Claim
36 words
Apparatus as in claim 9 wherein said first flapper valve is about 0.008 inches thick, said second flapper valve is about 0.015 inches thick, and both of said flapper valves are about 2 inches in length.
Claim 12
Dependent Claim
58 words
Apparatus as in claim 10 wherein said expansible chamber comprises a cylinder having a diameter of about 2 3/4 inches, and wherein a reciprocating piston, having a stroke length in the approximate range of about 1 1/2 inches to about 2 inches, is movably mounted in said cylinder to alternately enlarge and reduce the volume of said chamber.
Claim 13
Dependent Claim
30 words
Apparatus as in claim 11 wherein said exhaust means comprises an exhaust port and valve means normally closing said exhaust port, but opening in response to an exhaust pressure differential.
Claim 14
Dependent Claim
20 words
Apparatus as in claim 12 wherein said exhaust port has a diameter of about 1/2 inches to about 5/8 inches.
Claim 15
Dependent Claim
153 words
In a compressor having a compression chamber operatively connected to intake means and to exhaust means, an improved intake valve combination connecting said chamber to a common pressure fluid source and through a compressor head and comprising: two intake ports in said head defining said intake means, and through which fluid to be compressed is introduced to said compression chamber from said common pressure fluid source, a first flexible intake valve member disposed and biased to normally positively close a first one of said intake ports, said first valve member opening said first port in response to a first intake pressure differential, and a second flexible intake valve member spaced from the first valve member and disposed and biased to normally positively close a second one of said intake ports, said second valve member opening said second port in response to a second intake pressure differential different from said first intake pressure differential.
Claim 16
Dependent Claim
153 words
In a compressor having a compression chamber operatively connected to intake means and to exhaust means, an improved intake valve combination connecting said chamber to a common pressure fluid source and through a compressor head and comprising: two intake ports in said head defining said intake means, and through which fluid to be compressed is introduced to said compression chamber from said common pressure fluid source, a first flexible intake valve member disposed and biased to normally positively close a first one of said intake ports, said first valve member opening said first port in response to a first intake pressure differential, and a second flexible intake valve member spaced from the first valve member and disposed and biased to normally positively close a second one of said intake ports, said second valve member opening said second port in response to a second intake pressure differential different from said first intake pressure differential.
Claim 17
Dependent Claim
42 words
Apparatus as in claim 14 wherein said valve members are flapper valves, and further including a compressor head, said intake ports being disposed therein, and said head including flapper valve recesses, said flapper valves being disposed in respective ones of said recesses.
Claim 18
Dependent Claim
32 words
Apparatus as in claim 14 wherein said first and second valve members positively close said intake ports in sufficient time to minimize fluid from exhausting from said chamber through said intake ports.
Claim 19
Dependent Claim
24 words
Apparatus as in claim 14 wherein opening of said second port reduces the intake pressure differential otherwise exerted on said first flexible valve member.
Claim 20
Dependent Claim
34 words
Apparatus as in claim 17 wherein said first intake port is smaller in cross-sectional area than said second intake port and said second intake pressure differential is greater than said first intake pressure differential.
Claim 21
Dependent Claim
51 words
Apparatus as in claim 17 wherein said first and second flexible intake valve members are flapper valves and wherein said first valve member is thinner than said second valve member such that it is biased closed with a lesser force than that with which said second valve member is biased closed.
Claim 22
Dependent Claim
135 words
An improved compressor head adapted for connecting a compression chamber to a common pressure fluid source and comprising: at least two spaced compressor intake ports in said head and an exhaust port in said head, said two intake ports each respectively opening on one side of said head to a common pressure fluid source, and on another side of said head to said compression chamber, a first intake valve member disposed on said head and biased with a first force to normally positively close a first one of said intake ports, a second intake valve member spaced from the first intake valve member and disposed on said head and biased with a second force to normally positively close a second one of said intake ports, and said second force being greater than said first force.
Claim 23
Dependent Claim
135 words
An improved compressor head adapted for connecting a compression chamber to a common pressure fluid source and comprising: at least two spaced compressor intake ports in said head and an exhaust port in said head, said two intake ports each respectively opening on one side of said head to a common pressure fluid source, and on another side of said head to said compression chamber, a first intake valve member disposed on said head and biased with a first force to normally positively close a first one of said intake ports, a second intake valve member spaced from the first intake valve member and disposed on said head and biased with a second force to normally positively close a second one of said intake ports, and said second force being greater than said first force.
Claim 24
Dependent Claim
22 words
An improved compressor head as in claim 20 wherein said head comprises an integral single piece head member supporting said valve members.
Claim 25
Dependent Claim
18 words
Apparatus as in claim 20 wherein said first port is smaller in cross-sectional area than said second port.
Claim 26
Dependent Claim
12 words
Apparatus as in claim 20 wherein said valves are flexible flapper valves.
Claim 27
Dependent Claim
12 words
Apparatus as in claim 23 wherein said head includes valve receiving recesses.
Claim 28
Dependent Claim
14 words
Apparatus as in claim 24 wherein said flapper valves are disposed within respective recesses.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-26 | 1981-06-27 | 1981-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-26 | 1985-06-27 | 1985-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-26 | 1989-06-27 | 1989-12-27 | $7700.00 | Window Closed / Lapsed |