SU1345060A1 - Device for verifying liquid meters by comparison - Google Patents

Abstract

This invention relates to a measurement technique. The purpose of the invention is to improve the performance of calibration. Measuring tank 6 is a hydrostatic flow divider and contains a cavity 7 to ensure the unity of the initial verification conditions. The hydrostatic flow divider is filled to a level exceeding the level of cavity 7. Through the discharge pipe, excess fluid through the cavity is emptied, which ensures filling of hydrostatic gas {moA, CO NI SP of FIG.

Description

bodies of flow along the edge 8. This position is the starting point for the calibration of low-limit counters 11 by the control volume of the measuring tank 6. The opening of any of the end gates takes place spontaneously.

The invention relates to a measurement technique and can be applied to accurately measure the amount of liquid during calibration and calibration of liquid counters.

The purpose of the invention is to improve the performance of calibration.

Figure 1 presents the scheme of the proposed device; figure 2 - the initial position of the liquid in the measuring tank.

The device consists of a flow generator 1 connected to a receiving tank 2, a section with a calibrated high-forward counter 3 with a shut-off 4 and a regulating 5 devices, a measuring tank 6. The measuring tank 6 is also a hydrostatic flow divider and contains a cavity 7 ensuring the unity of initial ( final) verification conditions setting the origin of the reference volume overflow edge 8 forming the control volume cavity 9, inlet flow forming confuser 10, exemplary low-limit counters 11, end gates 12 and mouth tained flush end nozzles 13. Figure 2 illustrates the initial position of liquid in the measuring tank produced provisional pumping fluid where 14 - permanently filled part volume flow of the hydrostatic divider 6 and conduit 15 with exemplary nizkopredelnym counter 16.

The device works as follows.

 Fluid generator flow rate 1 from the receiving tank 2 is directed through a rotatable high-limit counter 3 into the cavity 7 of the hydrostatic divider 6 flow, then to the next emptying of the control volume through the checked counter 3. The flow range can be changed from the greatest to the lowest verification and operation of counters. 2 Il.

The cavity 9 of the control volume and when it is filled to a level above the installation plane of the inlet convergers 10 is directed to the model low-limit counters 11, if the end closures 12 are open, then it will flow free through the end connections 13 installed at the same level.

The verification of the high limit counter is performed as follows.

The fluid is pre-pumped through the entire hydraulic path with the end valves open. At the same time, after closing the locking device 5, the cavity 7 remains, the part of the control volume 14 of the hydrostatic divider 6 of the flow is constantly filled

and a permanently filled part of the pipeline with an exemplary low-limit meter 16. This is necessary to create a constant condition for the beginning and end of the measurement, which guarantees the passage of the same amount of fluid through the calibrated and exemplary counters. During pumping, the required flow is established by means of the regulating device 5, which can be measured using both standard counters and a stopwatch, as well as a level gauge, calibrated in units of flow. The verification of counter 3 is carried out

following way.

When a given flow rate is set and the locking device 4 is closed, the initial readings of the calibrated and reference counters are recorded, the locking device opens, and after a predetermined volume (time) has elapsed, the locking device closes. At the same time, depending on the set flow and hydraulic

collector resistances with sample devices simultaneously with the flow of fluid through the model meters, the metering tank is filled until the equilibrium between the fluid flow and flow through the collectors occurs. The completion of the verification cycle is accomplished by closing the locking device 4. The revolving counter stops. The liquid level in the measuring tank ensures that the model counter works; j which continue to account for the remaining liquid to the flow rate corresponding to their threshold of sensitivity.

The proposed device allows the verification of meters as follows.

The hydrostatic flow divider is filled to a level slightly above the level of cavity 7. Then, the excess fluid and cavity 7 are emptied through the discharge pipe, which ensures filling the hydrostatic flow divider along with the reference point for the reference volume of the overflow edge 8. the starting point for verification of low-limit counters is the control volume of the measuring tank. The discovery of any of

end gates - spontaneous emptying of control is carried out -. total volume through a calibrated meter. In this case, the flow range can vary from largest to smallest, thus ensuring that the conditions for checking and operating the meters are completely identical.

The device allows, within certain limits, to perform graduation or verification of high-limit meters at expenditures greater than those flowing through the reference ones.

Formula of the invention

A device for calibration of liquid meters by comparison, containing a flow generator, a section with an adjustable high-limit meter and a sample measuring tool connected in series with it, implemented as parallel-connected low-limit meters, characterized in that, in order to verify the performance of the calibration, between a high-limit meter and in parallel connected low-limit counters us-. Tank gauge connected to the atmosphere.

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Compiled by B.Kuznetsov Editor N.Shvydka Tekhred L.Oliynyk Proofreader M.Maksimishinets

Order 4910/41 Circulation 693 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Claims (1)

Claim A device for calibration of liquid meters by comparison, containing a flow generator, a section with a calibrated high-limit meter and an exemplary measuring instrument connected in series with it, made in the form of parallel-connected low-limit meters, characterized in that, in order to improve the performance of the calibration, between a highly-adjustable counter and parallel connected low-limit counters installed, measured tank connected to the atmosphere.