• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    SALVIMANDRAG A method for indicating a liquid fl fate comprises the steps of, when liquid fl fate changes when flowing through a pipe section (1), which is or has a throttle (4, 5), the liquid fl fate change between laminar and turbulent flow or reverse sensing is used and fluid fl size of fate. Turbulent flow is rejected via the vibrations created by the turbulence. A device for indicating a liquid fate comprises a conduit piece flowed through by the liquid fate. According to the invention, the conduit piece (1) is or has a choke (4, 5) and is connected to a vibration sensor (10). The sensor (10) senses the occurrence or increase or the cessation or reduction of vibrations which occur during the change of liquid fate from laminar to turbulent flow or vice versa.
    公开号:SE1001006A1
    申请号:SE1001006
    申请日:2010-10-12
    公开日:2012-04-13
    发明作者:Roland Braennstroem
    申请人:Roland Braennstroem；
    IPC主号:
    专利说明:

    15 20 25 30 TROUBLESHOOTING The object of the present invention is to design the initially suggested method so that it can be applied easily and cheaply with the aid of a very compact equipment. Furthermore, the purpose of the invention is to design the procedure in such a way that limit values can be easily changed, that the wear on used equipment is minimal and, consequently, the service life is long.
    The objective regarding the device is analogous to what has been said above.
    TROUBLESHOOTING The object underlying the invention is achieved with respect to the method, if this is characterized by the fact that in the event of a change in fluid fl fate, the fluid fl fate change between laminar and turbulent flow or vice versa is sensed and used as an indication of fluid fl fate.
    The object underlying the invention is achieved with regard to the device, if this is characterized by the sensor being a vibration sensor for sensing the occurrence or increase or cessation or decrease of vibrations which occur during the liquid-turbulence change from laminar to turbulent when changing the liquid. flow or vice versa.
    THE DRAWING The invention will now be described in more detail with reference to the accompanying drawing, which shows a schematic section through an embodiment of a device for carrying out the invention. 10 15 20 25 30 PREFERRED EMBODIMENT The indication of a liquid fl fate, i.e. the determination of a certain critical liquid ant fate, which must either not be exceeded or undershot, without an indication of this being given, is important in many technical contexts. An example of a practical situation where such a lower limit value can be exceeded is an application with a liquid analyzer, where certain qualities in the liquid must be assessed. It is obvious that if the fluid fate is too small, the assessment of the current fluid quality cannot be carried out or become incorrect. Conversely, if the analysis takes some time, the flow rate should not be too high, as the residence time of the liquid in the analyzer will then be too short.
    The invention is based on the basic idea that flow in a pipe section can be either laminar at low flow rates or turbulent at higher flow rates. A turbulent flow creates vibrations, ie pressure pulsations in the liquid, which are passed on to the material in the pipe section, whereby the flow takes place.
    The shift fi from the linear to turbulent flow takes place within a narrow velocity range, which is why such a change can be a good indicator that a certain linear flow velocity has been reached.
    The linear flow velocity in a liquid fl fate is mainly dependent partly on the volume fl fate and partly on the available flow area. For this reason, the fate is throttled according to the invention in a throttle, where the linear flow velocity increases. By varying the size of the choke, it is possible to vary the speed increase and thus also the relationship between the turning point from laminar to turbulent flow relative to the volume fl. However, the reasoning given above only applies if a number of other parameters are kept constant, such as surface structure, geometric design, radii of curvature, etc.
    The turbulence which is created in the liquid fl fate, when this is converted to turbulent flow, is felt according to the invention by means of a vibration sensor, which in terms of vibration must be directly affected by the flowing liquid or be connected to a line piece, through which the scattering takes place and to which the vibrations are transmitted. No direct contact between the liquid flow and the sensor itself is thus required in the latter case.
    In the figure, the reference numeral 1 refers to a pipe section through which a liquid flow takes place from an incoming connection 2 out to an outgoing connection 3. In the pipe section 1 there is at the outlet end a choke 4, which is preferably easily replaceable to allow different sizes of the hole. 5, through which the flow takes place.
    In the. Gure, the throttle is arranged at the outlet end of the pipe section for reasons which have nothing to do with the indication of the liquid flow itself. However, without leaving the reinforcement tank, the flow can also take place in the opposite direction, as illustrated by the double arrow 6.
    The pipe section 1 is made of a material which has a good ability to transmit vibrations, ie the material must not have a pronounced damping capacity. A suitable material may be a metal or a metal alloy. The throttle 4 is rigidly attached to the pipe section, so that the turbulence and the vibrations created by the flow through the hole 5 are transmitted to the pipe section 1.
    In order not to disturb the object of the invention and the indication of the liquid fl from the outside, vibration-damping couplings 7 and 8, respectively, are arranged between the incoming connection 2 and the outgoing connection 3, through which the invention is isolated from the environment in vibration.
    Rigidly connected to the line piece 1, there is a housing 9, which is vibration-transmittingly connected to the line piece 1. The material in the housing 9 is also selected in such a way that a good vibration-conducting ability is obtained. Here, too, a metal or a metal alloy may be a suitable choice. The interior of the housing 9 is suitably separated from the interior of the pipe section 1, so that the liquid flowing through the pipe section cannot enter the housing.
    Inside the housing 9 and rigidly connected thereto is a vibration sensor 10, which senses the vibrations or turbulence created by the flow of liquid through the hole 5 and is further transmitted via the choke 4, the pipe piece 1 and the housing 9. I a preferred form of vibration, the vibration sensor is based on a piezoelectric element, which has the ability to convert mechanical voltages into a varying electrical voltage upon mechanical action. Piezo-electric elements also have the ability to work at high fi sequences and have a long service life.
    The vibration sensor 10 is connected via a line 11 to an interface 12, which via a further line 13 and a possible vibration-damping seal 14 is connected, for example, to a suitable, recording instrument, some alarm device or a control system, etc. Alternatively, the signal transmission from interface 12 be wireless.
    In order to increase the amplitude of the vibrations caused by the turbulence at the hole 5, a screen wall 15 with an opening 16 can be left in the pipe section. By in this way at least partially limiting a certain volume inside the pipe section 1, a resonant chamber is created which amplifies the vibrations. Of course, the opening 16 must have a larger area than the hole 5.
    It has been indicated above that the area of the hole 5 determines the size of the volume fl which applies to the change from laminar to turbulent flow or vice versa. For this reason, the choke 4 is easily replaceable with different sizes of the hole 5. Another alternative is of course to make the size of the hole 5 variable, so that a continuous adjustment of the hole area can take place.
    In an alternative form of discharge, the pipe piece 1 can itself be designed as a choke and in such a form of discharge has a considerably smaller flow area than the incoming and outgoing line 2 and 3, respectively. In this form of discharge, the choke 4 with the hole 5 and the screen wall 15 with the opening 16.
    权利要求:
    Claims (13)
    [1]
    1. l. Procedure For the indication of a liquid fl fate, it is characterized that when the liquid fl fate changes, the fluid om change between laminar and turbulent flow or vice versa is sensed and used as an indication of the size of the liquid fl fate.
    [2]
    Method according to claim 1, comprising the steps of causing the liquid, the fate of which is to be indicated, to flow through a pipe section (1), characterized in that the pipe section is provided with or designed as a choke (4, 5), through which the liquid flows , that such vibrations, which occur or increase or cease or decrease, when the flow through the choke changes and changes from laminar to turbulent flow or vice versa, is used as an indicator of the volume flow through the pipe section.
    [3]
    The method according to claim 2, characterized in that the size of the choke (4, 5) is varied to vary the volume fl fate at which the changeover between laminar and turbulent flow or vice versa takes place.
    [4]
    Method according to claim 2 or 3, characterized in that the throttle (4, 5) is placed at the outlet end (3) of the pipe section (1).
    [5]
    Method according to one of Claims 2 to 4, characterized in that the line piece (1) is kept isolated from the environment in terms of vibration, in particular the line or lines (2 and 3, respectively) to which the line piece is connected.
    [6]
    Device for indicating a liquid fl fate, comprising a line piece (1), through which liquid fl fate flows, and a sensor (10), characterized in that the sensor is a vibration sensor: for sensing the occurrence of the occurrence of the liquid fl when changing liquid fl or the increase or cessation or decrease of vibrations, which occurs at the change of fluid fate from laminar to turbulent flow or vice versa. 10 15 20 25 7
    [7]
    Device according to Claim 6, characterized in that the pipe section (1) has a choke (4, 5) through which the flow takes place.
    [8]
    Device according to Claim 6, characterized in that the conduit piece (1) is itself designed as a throttle.
    [9]
    Device according to section 7, characterized in that the choke (4, 5) is replaceable or has an adjustable size.
    [10]
    Device according to Claim 7 or 9, characterized in that the throttle (4, 5) is arranged at the outlet end of the pipe section (1).
    [11]
    Device according to one of Claims 7 to 10, characterized in that the pipe section (1) is vibrationally isolated from the surroundings, mainly from the pipe or pipes (2, 3) to which the pipe section is connected, in that it is connected between the pipe section and the line or lines are arranged vibration damping elements (7, 8).
    [12]
    Device according to one of Claims 7 or 9 to 11, characterized in that a screen wall (15) with an opening (16) is arranged in the pipe section (1) and at a distance from the choke (4, 5). which is larger than the throttle, whereby a resonant chamber is formed in the line piece for amplifying vibrations.
    [13]
    Device according to one of Claims 6 to 12, characterized in that the sensor (10) comprises a piezoelectric element.
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    同族专利:
    公开号 | 公开日
    SE536017C2|2013-04-02|
    EP2627976A1|2013-08-21|
    EP2627976A4|2014-08-06|
    CN103314279B|2016-04-13|
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    引用文献:
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    US20080139951A1|2006-12-08|2008-06-12|Cardiac Pacemakers, Inc.|Detection of Stenosis|CN104778881A|2015-03-27|2015-07-15|浙江大学|Throttling type bistable on-way resistance experiment instrument and method thereof|
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    CN106052807A|2016-07-21|2016-10-26|国网山西省电力公司电力科学研究院|Three-vibration-sensor-based oil level fault diagnosis apparatus for oil-immersed power transformer|
    CN106052809A|2016-07-21|2016-10-26|国网山西省电力公司电力科学研究院|Oil level fault diagnosis device for oil-immersed power transformer|
    CN106052808A|2016-07-21|2016-10-26|国网山西省电力公司电力科学研究院|Electromagnetic-control-type-vibration-sensor-based oil level fault diagnosis method for oil-immersed power transformer|
    CN106052794A|2016-07-21|2016-10-26|国网山西省电力公司电力科学研究院|Oil level fault diagnosis device for oil-immersed power transformer|
    CN106052810A|2016-07-21|2016-10-26|国网山西省电力公司电力科学研究院|Electromagnetic-control-type-vibration-sensor-based oil level fault diagnosis method for oil-immersed power transformer|
    CN106289435B|2016-07-21|2019-12-13|国网山西省电力公司电力科学研究院|Oil-immersed power transformer false oil level diagnosis method based on three vibration sensors|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1001006A|SE536017C2|2010-10-12|2010-10-12|Method and apparatus for indicating a fluid flow|SE1001006A| SE536017C2|2010-10-12|2010-10-12|Method and apparatus for indicating a fluid flow|
    CN201180049664.1A| CN103314279B|2010-10-12|2011-10-10|A kind of method and apparatus being used to indicate the critical level of fluid flow|
    EP11832827.7A| EP2627976B1|2010-10-12|2011-10-10|A method and an apparatus for indicating a critical level of a liquid flow|
    PCT/SE2011/000177| WO2012050499A1|2010-10-12|2011-10-10|A method and an apparatus for indicating a critical level of a liquid flow|
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