Patent US3846774A successfully refreshed from Google Patents.
US3846774A
Expired / Lapsed
US
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Flow and differential pressure monitor
Assignee: ELEKTRISKE ELETTA AB
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Filing: 1973-02-06
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Granted: 1974-11-05
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Expires: 1993-02-06
Abstract
Abstract A flow and pressure differential monitor for detecting changes in fluid flow and for producing an alarm signal in response to flow changes above or below a set point level. The monitor includes a fluid flow channel and a signal generating means coacting therewith. The signal generating means comprises a movable element provided with a metal portion and arranged in the channel such as to be adjustable by fluid flowing therethrough. An inductive transducer is arranged externally of the channel such as to be actuated by the metal portion when the movable element occupies a certain position, actuation of the transducer causing an alarm signal to be given.
Inventors
- 👤 H Thorbard
- 👤 B Thorbard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:18
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/34; G01F1/36; G01F1/38; G01F1/383; G01F1/20; G01F1/22; G01F1/26; G01F1/28; Y; Y10; Y10T; Y10T137/00; Y10T137/8158; Y10T137/8225; Y10T137/8242
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
140 words
A flow and differential pressure monitor for indicating fluid flow comprising a fluid flow channel and a signal generating indicating means, said signal generating indicating means comprising a movable element provided with a metal portion and located within the channel, means mounting said element for movement to different positions by the fluid flowing in said channel, and externally of the channel a transducer in which an oscillator is arranged to be actuated by the metal portion at a certain position of the movable element to switch from one state to another to produce a signal in response to actuation by said metal portion, said switching from one state to another being caused by generation of eddy currents in said metal portion, the channel having a wall portion located between the movable element and the transducer comprising an electric insulating material.
Claim 2
Dependent Claim
140 words
A flow and differential pressure monitor for indicating fluid flow comprising a fluid flow channel and a signal generating indicating means, said signal generating indicating means comprising a movable element provided with a metal portion and located within the channel, means mounting said element for movement to different positions by the fluid flowing in said channel, and externally of the channel a transducer in which an oscillator is arranged to be actuated by the metal portion at a certain position of the movable element to switch from one state to another to produce a signal in response to actuation by said metal portion, said switching from one state to another being caused by generation of eddy currents in said metal portion, the channel having a wall portion located between the movable element and the transducer comprising an electric insulating material.
Claim 3
Dependent Claim
25 words
A monitor according to claim 1, and means to adjust the metal portion and the transducer to different, predetermined positions in relation to each other.
Claim 4
Dependent Claim
34 words
A monitor according to claim 1, characterized in that the movable element has the form of a valve body capable of being moved by the fluid flow against the force of a spring means.
Claim 5
Dependent Claim
19 words
A monitor according to claim 3, characterized in that the valve body is movable substantially axially in the channel.
Claim 6
Dependent Claim
21 words
A monitor according to claim 4, characterized in that the valve body is movable along a guide mounted in the channel.
Claim 7
Dependent Claim
56 words
A monitor according to claim 3, characterized in that the valve body is mounted in a branch channel connected at an angle to the channel, the opposite end of which branch channel is defined by the electric insulating material, and that the valve body is movable substantially fully into the branch channel and is guided thereby.
Claim 8
Dependent Claim
32 words
A monitor according to claim 6, characterized in that the metal portion is mounted on a stem displaceably arranged in the valve body and biassed by a spring towards the insulating material.
Claim 9
Dependent Claim
38 words
A monitor according to claim 6, characterized in that the channel is provided with a valve seating against which the valve body is caused to abut by means of the spring when no fluid flows in the channel.
Claim 10
Dependent Claim
55 words
A monitor according to claim 8, characterized in that the valve body is arranged for movement from the abutment position against the valve seating in a manner such that the area of an exposed through-flow area is changed only negligibly and so that the valve body reaches a position in which a signal is produced.
Claim 11
Dependent Claim
28 words
A monitor according to claim 1, characterized in that the movable element is arranged for pivoting movement and that its pivoting axis is located transversely of the channel.
Claim 12
Dependent Claim
86 words
A monitor according to claim 1, characterized in that the channel is a side channel, that the movable element is a diaphragm which closes the side channel, that the electric insulating portion has a surface facing the diaphragm, the surface and the diaphragm comprising the two main walls of a chamber, and that any pressure difference between the chamber and a chamber located on the other side of the diaphgram determines the position of the diaphragm at least with a pressure difference exceeding a limit value.
Claim 13
Dependent Claim
72 words
A monitor according to claim 11, and means monitoring the transducer for movement to different positions relative to both the metal portion of the diaphgram and the insulating portion, the transducer and the body of the monitor having a scale having associated indicating marks for reading the relative position of the transducer in relation to the diaphragm, said relative position determining the differential pressure at which the monitor produces the aforementioned signal.
Claim 14
Dependent Claim
109 words
A monitor according to claim 11, characterized in that the side channel extends with respect to the direction of flow from one side of a throttle plate to the other side of said plate, that the throttle plate is exchangeably arranged in the main channel of the fluid flow, that the monitor body is divided in a plane located perpendicularly to the axis of the main channel and the diaphragm in which plane both the throttle plate and the attachment edge of the diaphragm are located so that the throttle plate with fluid flowing therethrough creates the differential pressure which activates the transducer by means of said metal portion.
References Cited (Backward Citations)
US1967017A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |