Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
  • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
  • G01F15/005—Valves
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
  • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
  • G01F15/02—Compensating or correcting for variations in pressure, density or temperature
  • G01F15/026—Compensating or correcting for variations in pressure, density or temperature using means to maintain zero differential pressure across the motor
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
  • G01F3/00—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow
  • G01F3/02—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement
  • G01F3/04—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement having rigid movable walls
  • G01F3/06—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement having rigid movable walls comprising members rotating in a fluid-tight or substantially fluid-tight manner in a housing
  • G01F3/10—Geared or lobed impeller meters

Definitions

• the invention relates to a flow meter, with a Verdrängertowner, which is connected in parallel in a bypass line, a pressure difference transducer, wherein a rotatably connected to the Verdrängerperhapser engine depending on a differential pressure determined by Druckdifferenz- differential pressure between inflow and outflow of Verdrängerexcellenters 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 a gear counter VerdrängerGreater and a freely movable in a cylinder region of the bypass line parallel piston as Druckdifferenz- on.
• 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.
• 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.
• Bypass line parallel to the positive displacement also have a bypass channel, which connects at a maximum stroke stopper piston between Zu- and
• the present invention has the object to simplify the aforementioned hydraulic recirculation of the piston of the pressure difference 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.
• 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.
• the backstop which is preferably designed as a resilient or in the end against the free flow direction kinked check valve 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.
• 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 Maximai 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.
• 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 to explain 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 rotatably connected to the positive displacement meter 1 motor M is driven depending on a differential pressure detected at the pressure differential 2 between inflow and outflow (4, 5) of the positive displacement 1 for continuous differential pressure compensation.
• the Differenzteilaufillon 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 in a manner not shown here by known sensors or monitored - for example by means of optical sensors, Hall sensors or the like.
• FIG. 2 In order to allow rinsing, especially at restart or at high flow rates or large pressure differences between inflow and outflow 4, 5 of Verdrängeraciers 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 sides 4, 5 at the downstream end of a maximum stroke stop 9.
• a bore 10 in the wall of the cylinder portion 6 is released by the piston 7 and shortly before the piston 7 rests as shown in FIG. 2 on the stop 9.
• a non-return valve 1 1 formed z., As a resilient check valve 12 or as shown with a slight kink, whereby the (open) flap on closing the flow is closed more securely), which in the illustrated in Fig. 1 Position is funkionslos, since the bypass line 2 is blocked by the piston anyway.
• 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.
• 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.

Landscapes

• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Measuring Volume Flow (AREA)
• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=48222571

Family Applications (1)

Country Status (7)

Families Citing this family (10)

Family Cites Families (19)

• 2013
  • 2013-01-30 AT ATA50063/2013A patent/AT512027B1/de not_active IP Right Cessation
• 2014
  • 2014-01-22 WO PCT/EP2014/051199 patent/WO2014118045A1/de active Application Filing
  • 2014-01-22 KR KR1020157021400A patent/KR102047579B1/ko active IP Right Grant
  • 2014-01-22 EP EP14701346.0A patent/EP2951541A1/de not_active Withdrawn
  • 2014-01-22 JP JP2015554133A patent/JP6205431B2/ja not_active Expired - Fee Related
  • 2014-01-22 CN CN201480006676.XA patent/CN104956191B/zh not_active Expired - Fee Related
  • 2014-01-22 US US14/764,303 patent/US9746364B2/en not_active Expired - Fee Related

Non-Patent Citations (2)

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