Patent US3763884A successfully refreshed from Google Patents.
US3763884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant volume flow device
Assignee: Individual
•
Filing: 1972-02-14
•
Granted: 1973-10-09
•
Expires: 1992-02-14
Abstract
Abstract The device has a body defining a passage with an inlet portion, a smaller outlet portion, and a specially shaped progressively decreasing portion therebetween; has a restricting plate of generally the same transverse configuration as the passage but with smaller dimensions so as to provide open flow area between the plate and the body for fluid flow; has a rod attached to the plate and slidably mounted to a piston slidably positioned in a cylinder on a support member for axially mounting the plate in the progressively decreasing portion of the passage for movement therealong by the fluid flowing against the plate and through the open flow area; and has a spring extending from the plate upstream to be anchored to a rod secured to an axially adjustable cross member extending through slots in the body and having a gear wheel with fingers for threading along the spring to suitably adjust the spring rate of the spring and position the cross member relative the body to locate the plate at the position in the specially shaped progressively decreasing portion and under a suitable spring force whereby the open area corresponds to the fluid pressure force required to balance the spring force to give a constant flow of fluid. If need be, stabilizing rods may be provided from the support member through the plate to the cross member for preventing rotation of the plate relative the body. The special shape of the progressively decreasing portion is given by formulas for different types of springs and for different geometric shapes of passages and plates.
Inventors
- 👤 R Grassi
- 👤 L Leemhuis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:14
CPC Classifications
F; F24; F24F; F24F11/00; F24F11/70; F24F11/72; F24F11/74; F24F11/75; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7784; Y10T137/7792; Y10T137/7837; Y10T137/7869
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
312 words
In a constant fluid flow device having a body defining a flow passage with an inlet portion, an outlet portion of smaller cross-section than the inlet portion, and a progressively decreasing portion between said inlet and outlet portions, said body adapted to conduct a flow of fluid through said passage wherein such flow has a varying pressure at said inlet portion, a restricting member of substantially the same transverse configuration as the cross-section of the flow passage but with smaller dimensions, means for movably mounting said restricting member in said flow passage in said progressively decreasing portion thereof for axial movement therealong to regulate the fluid flow through said passage, means for normally biasing the restricting member axially toward said inlet portion with said fluid flow forcing said restricting member axially toward said outlet portion against the action of said biasing means, said restricting member being located at a position in the flow passage where the force thereon from said fluid flow equals the force thereon from said biasing means, the improvement comprising: the provision of a shape to said progressively decreasing portion to provide a cross-section along the length thereof having the relationship of ((A1/A2)2- 1)one-half equals the increase in the biasing force of said biasing means as the restricting member is displaced a distance x from the inlet portion into the progressively decreasing portion, wherein A1 is the cross-sectional area of the inlet portion, Ax is the open cross-sectional area between the progressively decreasing portion and the restricting member located the distance x from the inlet portion; and said biasing means increasing linearly with the distance x from the inlet portion such that the relationship ((A1/A2)2-1)onehalf equals a linear function of the distance x, so as to automatically regulate the fluid flow at said outlet portion and keep said flow constant regardless of the varying pressure at said inlet portion.
Claim 2
Dependent Claim
312 words
In a constant fluid flow device having a body defining a flow passage with an inlet portion, an outlet portion of smaller cross-section than the inlet portion, and a progressively decreasing portion between said inlet and outlet portions, said body adapted to conduct a flow of fluid through said passage wherein such flow has a varying pressure at said inlet portion, a restricting member of substantially the same transverse configuration as the cross-section of the flow passage but with smaller dimensions, means for movably mounting said restricting member in said flow passage in said progressively decreasing portion thereof for axial movement therealong to regulate the fluid flow through said passage, means for normally biasing the restricting member axially toward said inlet portion with said fluid flow forcing said restricting member axially toward said outlet portion against the action of said biasing means, said restricting member being located at a position in the flow passage where the force thereon from said fluid flow equals the force thereon from said biasing means, the improvement comprising: the provision of a shape to said progressively decreasing portion to provide a cross-section along the length thereof having the relationship of ((A1/A2)2- 1)one-half equals the increase in the biasing force of said biasing means as the restricting member is displaced a distance x from the inlet portion into the progressively decreasing portion, wherein A1 is the cross-sectional area of the inlet portion, Ax is the open cross-sectional area between the progressively decreasing portion and the restricting member located the distance x from the inlet portion; and said biasing means increasing linearly with the distance x from the inlet portion such that the relationship ((A1/A2)2-1)onehalf equals a linear function of the distance x, so as to automatically regulate the fluid flow at said outlet portion and keep said flow constant regardless of the varying pressure at said inlet portion.
Claim 3
Dependent Claim
55 words
In the constant fluid flow device of claim 1 wherein said means biasing said restricting member is provided by a linear spring, and further comprising; means for adjusting the rate of said linear spring to provide different constant flow rates through said device, each constant rate being independent of pressure variations at said inlet portion.
Claim 4
Dependent Claim
43 words
In the constant fluid flow device of claim 2, further comprising; means for dampening oscillations of said restricting member otherwise caused by the action of said spring biasing means in the presence of pressure fluctuations in the flow of fluid through said device.
Claim 5
Dependent Claim
74 words
In the constant fluid flow device of claim 1, wherein said body defines a flow passage of circular cross-section and said restricting member is also circular in transverse configuration and has a smaller diameter than that of said flow passage, and wherein the relationship between a decreasing value y in the diameter of the flow passage as a function of the axial distance x into the progressively decreasing portion is shown by the formula:
Claim 6
Dependent Claim
113 words
In the Constant fluid flow device of claim 1 wherein said body defines a flow passage of rectangular cross-section and said restricting member has a rectangular cross-section in which one of the dimensions thereof approaches that of a corresponding first dimension of said flow passage and said progressively decreasing portion of said flow passage is provided by a decreasing second dimension, said restricting member and said flow passage body having mating bearing means interconnected therebetween, and wherein the relationship between a decreasing y value in the second dimension of said passage as a function of the axial distance x into the progressively decreasing portion of said body passage is defined by the formula:
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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |