WO2011116895A1 - Flow monitor - Google Patents

Flow monitor Download PDF

Info

Publication number
WO2011116895A1
WO2011116895A1 PCT/EP2011/001297 EP2011001297W WO2011116895A1 WO 2011116895 A1 WO2011116895 A1 WO 2011116895A1 EP 2011001297 W EP2011001297 W EP 2011001297W WO 2011116895 A1 WO2011116895 A1 WO 2011116895A1
Authority
WO
WIPO (PCT)
Prior art keywords
flow
flow channel
reed switch
switching
arranged
Prior art date
Application number
PCT/EP2011/001297
Other languages
German (de)
French (fr)
Inventor
Friedrich Blasberg
Lutz Blasberg
Original Assignee
Blasberg Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DE202010003915.0 priority Critical
Priority to DE201020003915 priority patent/DE202010003915U1/en
Application filed by Blasberg Gmbh filed Critical Blasberg Gmbh
Publication of WO2011116895A1 publication Critical patent/WO2011116895A1/en

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01PMEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P13/00Indicating or recording presence, absence, or direction, of movement
    • G01P13/0006Indicating or recording presence, absence, or direction, of movement of fluids or of granulous or powder-like substances
    • G01P13/0013Indicating or recording presence, absence, or direction, of movement of fluids or of granulous or powder-like substances by using a solid body which is shifted by the action of the fluid
    • G01P13/002Indicating or recording presence, absence, or direction, of movement of fluids or of granulous or powder-like substances by using a solid body which is shifted by the action of the fluid with electrical coupling to the indicating devices
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow
    • G01F1/05Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow by using mechanical effects
    • G01F1/20Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow by using mechanical effects by detection of dynamic effects of the fluid flow
    • G01F1/22Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow by using mechanical effects by detection of dynamic effects of the fluid flow by variable-area meters, e.g. rotameters
    • G01F1/24Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow by using mechanical effects by detection of dynamic effects of the fluid flow by variable-area meters, e.g. rotameters with magnetic or electric coupling to the indicating device
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00Switches operated by change of a physical condition
    • H01H35/24Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/40Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by devices allowing continual flow of fluid, e.g. vane
    • H01H35/405Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by devices allowing continual flow of fluid, e.g. vane the switch being of the reed switch type
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H36/00Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding
    • H01H36/0006Permanent magnet actuating reed switches
    • H01H36/0013Permanent magnet actuating reed switches characterised by the co-operation between reed switch and permanent magnet; Magnetic circuits
    • H01H36/002Actuation by moving ferromagnetic material, switch and magnet being fixed

Abstract

The invention relates to a flow monitor for monitoring the flow of liquid or gaseous flow media through a flow channel (2), comprising a switching element (3), which is arranged in the flow channel (2) and around which the flow medium flows and which can be moved under the influence of the flow medium against the force of a restoring means (6, 7) from a neutral position to a switching position, in which the switching element actuates a reed switch (8) arranged next to the flow channel (2). In order to ensure for such a flow monitor that sufficient magnetic forces for actuating the reed switch (8) can be provided despite the narrow flow channel, at least one permanent magnet (4, 5) is arranged opposite the reed switch (8) outside the flow channel (2), and the switching element (3) arranged in the flow channel (2) is made of a material having high magnetic permeability and forms a magnetic bridge between the permanent magnets (4, 5) and the reed switch (8) in the switching position of the switching element.

Description

 Flow Switch

The invention relates to a flow monitor for monitoring the flow of liquid or gaseous flow media through a flow channel, arranged in the flow channel, flowed around by the flow medium switching body which is displaceable under the influence of the flow medium against the force of a return means from a neutral position to a switching position in which he operates a arranged next to the flow channel reed switch.

According to the prior art (cf, for example, DE 195 18 669 A1), a flow monitor with the features indicated above is known. In the previously known flow monitor, the switching body itself is designed as a permanent magnet, with the magnetic force of the reed switch is actuated. The latter can be problematic if the flow of very small amounts of liquid or gaseous flow media is to be monitored in the case of a narrow cross-section of the flow channel. In such a case, only very little installation space is available for the permanent magnet within the narrow flow cross-section of the flow channel. It is therefore difficult to accommodate a sufficiently powerful permanent magnet as a switch body in the very narrow installation space.

It is therefore an object of the invention to develop the flow monitor of the type mentioned in such a way that, despite the narrow flow channel sufficient magnetic forces for the operation of the reed switch can be provided.

CONFIRMATION COPY To achieve this object, the invention proposes, starting from a flow monitor of the type mentioned above, that at least one permanent magnet is disposed outside the flow channel relative to the reed switch, and that the arranged in the flow channel switching body consists of a material having high magnetic conductivity and in its Switching position forms a magnetic bridge between the permanent magnet and the reed switch.

In the flow monitor according to the invention, the magnetic forces required for the operation of the reed switch are no longer provided by the small switching body, but by a strong permanent magnet arranged outside the flow channel, the volume of which is not limited by the narrow dimensions of the flow channel. The reed switch is always actuated only when the switch body has been moved under the influence of the flow medium in the switching position and in this way the magnetic bridge between the permanent magnet and the reed switch is made. The switch body expediently consists of ferromagnetic material, in particular of steel. He has further expedient the shape of a ball, because in a sphere, the ratio between volume and surface is most favorable. Of course, instead of a sphere, you can also use similar small-sized spherical elipsoids or cylinders.

For a flow monitor operating in both directions of flow, it is further provided that two permanent magnets are provided opposite the reed switch, which are at a distance from one another in the longitudinal direction of the flow channel, wherein the neutral switching position of the switching element lies in the middle between the two permanent magnets and each permanent magnet has a switching position is assigned, in which the switch body is located between the respective permanent magnet and the reed switch. In order to adjust the switching point or points of the flow switch, it is finally still provided that the switching body associated Return means are designed as springs whose bias is adjustable by adjusting screws.

Embodiments of the invention will be explained in more detail below with reference to the drawing. Show it:

Schematically a flow monitor according to the invention, which monitors the flow in two opposite directions of flow; schematically a flow monitor according to the invention, which monitors the flow in only one direction of flow; schematically a flow monitor according to the invention, in which the switching points in both

Flow directions are adjustable.

In the drawing, a housing made of non-magnetic material is designated by the reference numeral 1. Horizontally through this housing 1 extends a flow channel 2. In this flow channel is centrally from a magnetically conductive material, eg. B. made of steel ball 3, whose diameter is slightly smaller than the inner diameter of the flow channel 2 and which is flowed around by the flow medium flowing through the flow channel.

Below the flow channel 2, two spaced-apart permanent magnets 4 and 5 are arranged in the housing 1. The ball 3 is located in Figure 1 in a neutral center position and is held in this neutral center position of two compression springs 6 and 7, which act on the ball 3 from opposite sides. On the permanent magnet 4 and 5 opposite side of the flow channel 2, a reed switch 8 is arranged with an electrical connection 9. The reed switch 8 has such a distance from the permanent magnet 4 and 5 that their magnetic fields actuate the reed switch only when the ball 3 is in their switching positions. These switch positions are each determined by the center of the respective permanent magnets 4 and 5. If the ball 3 is located centrally above one of the permanent magnets 4 or 5, it directs its magnetic field in such a way towards the reed switch 8 that it is actuated. Between the respective permanent magnet 4 or 5 and the reed switch 8 thus formed by the ball 3 formed magnetic bridge.

In the embodiment of Figure 2, the ball 3 is acted upon only from one side with a compression spring 6. From the opposite side, the ball is supported on a support sleeve 10 from the other hand. Accordingly, this flow monitor only works with a flow through the flow channel 2 from left to right.

In addition, the compression spring 6 is associated with an adjusting screw 11 which can be rotated so that the bias of the compression spring 6 is changed. This makes it possible to order the switching point of this one-sided pressure switch.

In the embodiment according to FIG. 4, both connections of the flow channel 2 are provided with corresponding screw devices, by which the pretension of the compression springs 6 and 7 can be adjusted in both flow directions.

- Claims -

Claims

claims
1. Flow monitor for monitoring the flow of liquid or gaseous flow media through a flow channel (2) arranged in the flow channel (2), flowed around by the flow medium switching body (3) under the influence of the flow medium against the force of a return means (6 , 7) is displaceable from a neutral position into a switching position, in which it actuates a reed switch (8) arranged next to the flow channel (2),
characterized in that outside the flow channel (2) opposite to the reed switch (8) at least one permanent magnet (4, 5) is arranged, and that in the flow channel (2) arranged switching body (3) consists of a material having high magnetic conductivity and forms a magnetic bridge between the permanent magnets (4, 5) and the reed switch (8) in its switching position.
2. Flow monitor according to claim 1, characterized in that the switching body (3) made of ferromagnetic material, in particular made of steel.
3. Pressure monitor according to claims 1 and 2, characterized in that the switching body (3) has the shape of a sphere.
4. Pressure monitor according to one of claims 1 to 3, characterized in that opposite the reed switch (8) has two permanent magnets (4, 5) are provided, which in the longitudinal direction of Flow channels (2) have a distance from each other, wherein the neutral switching position of the switch body (3) in the middle between the two permanent magnets (4, 5) and each permanent magnet (4, 5) is assigned a switching position in which the switch body (3) between the respective permanent magnet (4 or 5) and the reed switch (8).
5. Flow monitor according to one of claims 1 to 4, characterized in that the switching body (3) associated return means as springs (6, 7) whose bias is adjustable by adjusting screws (11).
- Summary -
PCT/EP2011/001297 2010-03-20 2011-03-16 Flow monitor WO2011116895A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE202010003915.0 2010-03-20
DE201020003915 DE202010003915U1 (en) 2010-03-20 2010-03-20 Flow Switch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20110724530 EP2550510A1 (en) 2010-03-20 2011-03-16 Flow monitor

Publications (1)

Publication Number Publication Date
WO2011116895A1 true WO2011116895A1 (en) 2011-09-29

Family

ID=42558342

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/001297 WO2011116895A1 (en) 2010-03-20 2011-03-16 Flow monitor

Country Status (3)

Country Link
EP (1) EP2550510A1 (en)
DE (1) DE202010003915U1 (en)
WO (1) WO2011116895A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3327079A (en) * 1964-03-12 1967-06-20 Bosch Gmbh Robert Magnetically operated electric switch
JPH01158315A (en) * 1987-12-15 1989-06-21 Tlv Co Ltd Flow rate detector
US5373125A (en) * 1993-03-23 1994-12-13 Motorola, Inc. Switch assembly
DE19518869A1 (en) 1995-05-23 1996-11-28 Stegau Suedthueringer Entwickl Flow sensor for use with pulsed lubrication feeds

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3327079A (en) * 1964-03-12 1967-06-20 Bosch Gmbh Robert Magnetically operated electric switch
JPH01158315A (en) * 1987-12-15 1989-06-21 Tlv Co Ltd Flow rate detector
US5373125A (en) * 1993-03-23 1994-12-13 Motorola, Inc. Switch assembly
DE19518869A1 (en) 1995-05-23 1996-11-28 Stegau Suedthueringer Entwickl Flow sensor for use with pulsed lubrication feeds

Also Published As

Publication number Publication date
EP2550510A1 (en) 2013-01-30
DE202010003915U1 (en) 2010-08-12

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