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Piston prover

A technology of calibrator and piston, which is applied in the direction of testing/calibration devices, instruments, measuring devices, etc., can solve the problems of hindering rotation, difficulty in maintenance, high cost, etc., and achieve the effect of reducing the number of parts, lowering the cost, and simplifying the structure

Active Publication Date: 2013-03-13
OVAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, the SVP described in Patent Document 1 has a structure in which the piston rod is integrally fixed to the measuring piston when pressure is applied to the measuring piston in the direction of rotation, etc., so there is a problem that the piston rod acts as resistance and Interfering with rotation, thereby exerting a load on the measuring piston
Furthermore, when a load exceeding the necessary limit is applied to the measuring piston, the measuring piston cannot move smoothly in the measuring cylinder, and accurate measurement cannot be performed.
[0013] In addition, the SVP described in Patent Document 1 has a double-pipe structure, and has a slide valve for switching flow paths and a mechanism independent of sealing inspection and detection. high

Method used

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Embodiment Construction

[0030] Next, preferred embodiments of the piston calibrator of the present invention will be described with reference to the drawings.

[0031] Fig. 1 and Fig. 2 are diagrams showing an example of the external appearance and structure of the piston calibrator of the present invention. FIG. 1 is a front view, and FIG. 2 is a plan view. In the figure, 1 indicates the piston calibrator, 2 indicates the measuring cylinder, 3 indicates the upstream end, 4 indicates the downstream end, 5 and 6 indicate the exhaust valve, 7 indicates the fluid inlet, 8 indicates the fluid outlet, 9 indicates the measuring piston, 10 and 11 represent magnetic switches, 12 represent hydraulic cylinders, 13 represent piston rods, and d1 and d2 represent drainage parts (drain valves).

[0032] The piston calibrator 1 is provided with: a measuring cylinder 2, which is formed with an upstream end 3 for fluid inflow and a downstream end 4 for fluid outflow; a hydraulic cylinder 12 connected to the downstre...

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PUM

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Abstract

Disclosed is a piston prover which enables smooth movement of a measuring piston through a measurement cylinder without applying more than necessary load to the measuring piston and which has a simplified structure with reduced parts count. The piston prover (1) includes the measurement cylinder (2) provided with an upstream end (3) and a downstream end (4); a hydraulic cylinder (12) coupled to the downstream end of the measurement cylinder (2); the measuring piston (9) which during measurement, a fluid drawn from the upstream end (3) causes to move by a predetermined distance from upstream towards downstream through the measurement cylinder (2) to displace a specified volume of fluid; and a piston rod (13) accommodated movably in the hydraulic cylinder (12). The measuring piston (9) and the piston rod (13) are separately constructed, in which to allow the measuring piston (9) to return to a predetermined upstream measurement standby position, the piston rod (13) moves the measuring piston (9) from downstream towards upstream to set the measuring piston (9) at the predetermined measurement standby position, and thereafter, the piston rod (13) is accommodated in the hydraulic cylinder (12).

Description

technical field [0001] The present invention relates to piston calibrators, and more particularly, to small reference volume piston calibrators for calibrating the accuracy of flow meters. Background technique [0002] The so-called calibration device for calibrating flowmeters is such a device: for the characteristics of newly manufactured flowmeters or flowmeters in use relative to external factors such as temperature and pressure or internal factors such as wear of movable parts, etc. Changes are used with reliable accuracy, and characteristic tests are performed periodically or at arbitrary timing. If it is roughly distinguished, the flowmeter test device of the calibrator type is used to test the flowmeter to be tested by clamping the flowmeter to be tested on a fixed test device, and the flowmeter test device of the calibrator type to test arbitrarily by clamping a flowmeter in the fluid system. Characteristic test. [0003] The calibrator method can perform the char...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F25/00
CPCG01F25/0015G01F25/11G01F25/00
Inventor 久下宏一饭田一
Owner OVAL CORP