• 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:
    In a flow meter with positive displacement meter (1), a pressure differential sensor (3) connected in parallel has a bypass channel (8) which, at its piston (7) abutting its maximum stroke stop (9), establishes a connection between inflow and outflow sides (4, 5) releases. In the bypass channel (8) a non-return valve (11) is arranged, which prevents the return flow from the outflow to inflow side (5, 4) and thus allows a purely pressure-induced return of the piston (7).
    公开号:AT512027A2
    申请号:T50063/2013
    申请日:2013-01-30
    公开日:2013-04-15
    发明作者:
    申请人:Avl List Gmbh；
    IPC主号:
    专利说明:

    10 2013/50063
    AV-3517 AT
    Flowmeter
    The invention relates to a flow meter, with a Verdrängerzähler, which is connected in parallel in a bypass line, a pressure difference sensor, wherein a rotationally connected to the positive displacement engine depending on a fixed by the pressure difference transducer differential pressure between inflow and outflow of Verdrängerzählers for continuous differential pressure compensation is controlled, wherein the pressure difference sensor has a freely movable in a cylinder region of the bypass line piston, which determined by a differential pressure occurring deflection is determined and used to drive the motor of the positive displacement, and wherein the bypass line has a bypass channel, which at downstream on a Maximalhub stop abutting piston releases a connection between inflow and outflow side.
    Such measuring devices are known for example from EP1644707B1, DE1798808B or GB2185785A and have as central assemblies on a trained example as gear counter positive displacement and a freely movable in a cylinder region of the bypass line parallel piston as a pressure difference transducer. Liquid medium is fed from the inflow side coming through the positive displacement in the direction downstream side, with a variable in its speed servomotor drives the positive displacement. Parallel to the displacement meter, the inlet-side space of the cylinder region of the pressure difference sensor is connected to the inlet of the displacement counter and the drain-side space of this cylinder region to the downstream side of the positive displacement. By means of a control electronics is sought to position the piston of the differential pressure transducer by differential pressure compensation always in its zero position. Each flow change causes a displacement of the piston, which is corrected immediately by means of a speed adaptation of the motor of the displacement counter, whereby the speed of this motor is directly proportional to the monitored flow. It can also very minimal flows or flow changes are determined very precisely, as is very essential, for example, for the fuel consumption measurement of test benches for internal combustion engines.
    To allow for short-term excessively large volume flows or large pressure increases, for example, due to a failure of the pump or a blockage in the system, an additional outflow via the pressure difference transducer, the bypass line parallel to the positive displacement also have a bypass channel, which at at a maximum -Huban stop applied piston releases a connection between inflow and outflow side. Especially when restarting, when the device is to be rinsed (ie freed of air), the piston is deflected to the stop. But as soon as the piston l
    AV-3517 AT is attached to this stop, it will continue to be held by the system pressure on this stop so that the renewed return to the Mitteilage a turn pressure equalization is not enough, but additional measures must be taken. It is known in this context, the arrangement of a spring on cooperating with the end face of the piston stop, which at least initially pushes the piston at pressure equalization between inflow and outflow side of the stop and thus, after the bypass channel is completed again, the hydraulic feedback would be in the middle make sure again.
    Based on the known devices mentioned, the present invention has the object to simplify the aforementioned hydraulic return of the piston of the pressure difference transducer in its central position, without having to use additional springs or the like on the piston or in the cylinder chamber, which requires a certain overhead and makes the meter more susceptible to interference.
    This object is achieved according to the present invention in a measuring device of the type mentioned above in that in the bypass channel, a non-return valve is arranged, which prevents the return flow from outflow to inflow side. So now if the piston of the pressure difference pickup rests against its maximum stroke stop and thereby opens the bypass channel, opens by the flowing fluid and the non-return valve, whereby a relatively unobstructed flow through the bypass line can be done. When the pressure on the outflow side becomes greater again, upon reaching the pressure level of the inflow side, any further flow towards the outflow side will cease via the pressure difference transducer, whereby the backstop, which is preferably designed as a resilient or in the end region against the free flow direction non-return flap can, and closes and on the outflow side end face of the piston in the associated cylinder area building pressure or the force acting thereon on the piston becomes larger and eventually the piston shifts so far towards the center position that the bypass line is closed again. Then the freely movable piston can again serve for the compensation of the differential pressure between inflow and outflow of the positive displacement.
    At least the downstream end face of the piston and / or the associated maximum stroke stop in the cylinder area is reduced in a preferred embodiment of the invention over the other piston or cylinder diameter, which simplifies the initial release of the piston away from the stop in the middle position with small differential pressures or supported. 2MMMMM & HMS 102013/50063
    AV * 3517 AT
    The invention will be explained in more detail in the Fogenden with reference to the embodiments schematically illustrated in the drawing. 1 shows a schematic sketch for explaining the mode of operation of a flowmeter according to the invention, and FIG. 2 shows a detail of the pressure difference sensor of a flowmeter according to the invention in axial section through the piston axis.
    The flow meter according to FIG. 1 has a positive displacement meter 1, which can be designed, for example, as a known gear meter and to which a pressure difference sensor 3 is connected in parallel in a bypass line 2. A rotationally connected to the positive displacement meter 1 engine M is controlled depending on a differential pressure detected at the pressure difference transducer 2 between inflow and outflow side (4, 5) of the positive displacement 1 for continuous differential pressure compensation. The Differenzdruckaufnehmer 3 has a freely movable in a cylinder region 6 of the bypass line 2 piston 7, which determined by a differential pressure occurring deflection is determined and used to control the motor M of the displacement counter 1. The deflection (-x / + x) of the piston 7 from its central position as shown is measured or monitored in a manner not shown here by known sensors, for example by means of optical sensors, Hall sensors or the like.
    In order to allow rinsing, especially at restart or at high flow rates or large pressure differences between inflow and outflow 4, 5 of Verdrängerzählers 1 for safety reasons, an overflow via the pressure difference transducer 3 is shown in FIG. 2 in the bypass line 2, a bypass channel 8 is provided, which releases a connection between inflow and outflow side 4, 5 at the outflow side at a maximum stroke stop 9 abutting piston 7. In this case, a bore 10 in the wall of the cylinder portion 6 is released by the piston 7 and shortly before the piston 7 as shown in FIG 2 abuts the stop 9. In this bypass channel 8 is a Rückschiagsperre 11 (formed, for example, as a resilient check valve 12 or illustrated with a slight kink, whereby the (open) flap is more securely closed upon reversal of the flow), which is in the position shown in Fig. 1 functionless as the bypass line 2 is blocked by the piston anyway. As long as the pressure on the inflow side 4 is higher than on the outflow side 5, medium will flow through the bore 10 into the bypass channel 8 (in the case of an open non-return flap 12, not shown) and from there to the outflow side 5. When the pressure upstream and downstream becomes equal again, the piston 7 initially stops at the stop 9 and would be difficult to move away again (without a backstop 11), since the piston surface on the opposite free side is in any case larger than the free piston surface on the side of the stop 9. Only the closed check flap 12 allows the construction of a corresponding pressure. 3
    10 2013/50063
    AV-3517 AT on the stop side end face of the piston and thus a movement thereof in the direction of the central position until the bore 10 and thus the bypass channel 8 is closed again by the piston 7. The flap has a slight kink which helps to release the flap on its return from its open position. Therefore, a spring is not necessary here. Even if the flap is installed upside down (gravity wants to keep the flap open), it may close very early due to this kink.
    In order to be able to release the piston 7 initially from the maximum stroke stop 9 more easily due to pressure, the corresponding end face of the piston (or the associated maximum stroke stop 9 in the cylinder area 6) has a reduced diameter compared to the other piston or cylinder diameter. which provides an initially larger attack surface for the actuating pressure. 4
    权利要求:
    Claims (3)
    [1]


    102013/50063 AV-3517 Claims 1. Flow meter, comprising a positive displacement meter (1), in which a differential pressure transducer (3) is connected in parallel in a bypass line (2), wherein a motor (M) rotatably connected to the positive displacement counter (1) dependent on one of the pressure difference transducer (3) detected differential pressure between inflow and outflow side (4, 5) of the positive displacement counter (1) is driven to the continuous differential pressure compensation, wherein the pressure difference transducer (3) one in a cylinder region (6) the bypass line (2) freely movable piston (7) whose determined by a differential pressure occurring deflection determined and used to control the motor (M) of the Verdrängerzählers (1), and wherein the bypass line (2) has a bypass channel (8) the at the outflow at a maximum stroke stop (9) fitting piston (7) a connection between inflow and outflow side (4, 5) releases, characterized in that in By Passage (8) a non-return valve (11) is arranged, which prevents the return flow from outflow to inflow side (5, 4).
    [2]
    2. Flowmeter according to claim 1, characterized in that the non-return valve (11) as a resilient or in the end region against the free flow direction kinked check valve (12) is formed.
    [3]
    3. Flowmeter according to claim 1 or 2, characterized in that at least the downstream end face of the piston (7) and / or the associated maximum stroke stop (9) in the cylinder region (6) relative to the other piston or. Cylinder diameter is reduced. 5
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    AT512619A3|2013-06-26|2015-01-15|Avl List Gmbh|Flowmeter|GB931092A|1958-10-03|1963-07-10|Dowty Rotol Ltd|Improvements in or relating to liquid metering arrangements|
    DE1798080C2|1968-08-19|1974-05-16|Pierburg Luftfahrtgeraete Union Gmbh, 4040 Neuss|Electronically controlled flow meter and metering device|
    DE2728250A1|1977-06-23|1979-01-04|Pierburg Luftfahrtgeraete|FLOW METER AND DOSING DEVICE|
    DE3019534C1|1980-05-22|1981-10-15|Joachim Ihlemann System Elektr|Device for determining the amount of a fluid flowing through a line, in particular a liquid|
    JPH0445765B2|1982-10-14|1992-07-27|Bosch Gmbh Robert|
    GB2185785B|1986-01-25|1989-11-01|Ford Motor Co|Liquid flow meter|
    EP0244976A1|1986-04-21|1987-11-11|Vickers Systems Limited|Flow sensor|
    DD253674A1|1986-11-19|1988-01-27|Verkehrswesen Forsch Inst|AUTOMATIC OPENING FOR VOLUME ELEMENTS|
    JPS63148831A|1986-12-09|1988-06-21|Hitachi Ltd|Controller of stational reactive power compensator|
    JPS63148831U|1987-03-20|1988-09-30|
    JPH01110023A|1987-10-21|1989-04-26|Mitsubishi Electric Corp|Power receiving equipment for multiple system|
    JPH0678925B2|1987-11-26|1994-10-05|東京瓦斯株式会社|Backflow prevention device for integrating flowmeter|
    JPH02124430A|1988-11-02|1990-05-11|Ono Sokki Co Ltd|Pressure difference compensation type flow rate measuring equipment|
    US6629411B2|2001-05-09|2003-10-07|Valeo Electrical Systems, Inc.|Dual displacement motor control|
    DE10331228B3|2003-07-10|2005-01-27|Pierburg Instruments Gmbh|Device for measuring time-resolved volumetric flow processes|
    US7513150B2|2005-06-16|2009-04-07|Parris Earl H|Check valve module for flow meters with fluid hammer relief|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50063/2013A|AT512027B1|2013-01-30|2013-01-30|Flowmeter|ATA50063/2013A| AT512027B1|2013-01-30|2013-01-30|Flowmeter|
    KR1020157021400A| KR102047579B1|2013-01-30|2014-01-22|Flowmeter|
    EP14701346.0A| EP2951541A1|2013-01-30|2014-01-22|Flowmeter|
    PCT/EP2014/051199| WO2014118045A1|2013-01-30|2014-01-22|Flowmeter|
    CN201480006676.XA| CN104956191B|2013-01-30|2014-01-22|Flow measurement equipment|
    US14/764,303| US9746364B2|2013-01-30|2014-01-22|Flowmeter having pressure difference sensor in parallel with displacement meter|
    JP2015554133A| JP6205431B2|2013-01-30|2014-01-22|Flowmeter|
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