CN2156481Y - Pipe line flow quantity meter - Google Patents

Abstract

The utility model relates to a pipe line flow quantity meter, which is characterized in that a pressure metering pipe arranged in a water pipeline goes through the circle center of the pipeline, one section of the pressure metering pipe from the circle center of the pipeline to the wall of the pipeline is provided with a dynamic pressure metering hole against the water current direction, the other section is provided with a static pressure metering hole along the tangential direction of the water current and the pressure metering pipe, and both ends of the pressure metering pipe are provided with water meters. The utility model has the advantages of simple use without change of prior pipelines, water meter record not needing electricity, convenient management, strong anti-interference ability, convenient maintenance and low cost, capable for use in a large-sized pressure water pipeline.

Description

Pipe line flow quantity meter

The utility model relates to fluid measurement instrument, specifically pipeline flowmeter.

Existing pipeline flow method of testing is more, can be divided into two big classes, 1 by principle of work) the pressure reduction class has: plate hole, Venturi tube, Pitot tube, elbow methods etc. when being characterized in the measuring pressure difference, need artificial reading, survey instantaneous value, or survey with special-purpose electric measuring instrument and to remember; 2) the flow velocity class has: impeller, vortex street, electromagnetism, ultrasound wave, laser etc., except that propeller flowmeter, all need use meter specially.And the common ground of above-mentioned flowmeter is to install complicatedly, needs the repacking pipeline, and perhaps registering instrument is an electric measuring instrument, and instrument is complicated, electricity consumption, and trouble is gone up in management.

The purpose of this utility model is to provide a kind of above-mentioned deficiency that can overcome, simple and easy to do, as to save energy pipeline flowmeter.

The technical solution of the utility model is: establish a piezometric tube by this pipeline center of circle in aqueduct, one section the survey pitot aperture that meet water flow path direction arranged of piezometric tube from the pipeline center of circle to duct wall, have on another section along the static-pressure inlet of current piezometric tube tangential direction, at two terminations, one water meter of piezometric tube.The quantity of pressure tap is 5～20, and the area of each pressure tap and pitch of holes must satisfy following formula:

${\mathrm{\ω}}_i/{\mathrm{\ω}}_{\mathrm{AB}}\·\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\Δ\ω}}_i=1_i/L\·\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\Δ}1}_i\left(1\right)$

(wherein ω AB is the area of passage of piezometric tube, and ω i is the pressure tap area, and L is a piezometric tube length, and li is the pressure tap spacing).

The utlity model has following characteristics: 1) can on large-scale pressure water pipe, use; 2) implement simply needn't change former pipeline; 3) adopt the water meter record, do not need electricity consumption, and comparatively convenient in the management; 4) antijamming capability is strong; 5) easy to maintenance, cost is low.

Fig. 1 is the synoptic diagram of flowmeter of the present utility model

Embodiment, as shown in Figure 1, at aqueduct 1, its diameter is to establish a piezometric tube 2 by this pipeline center of circle in 340 millimeters, and the diameter of piezometric tube is 15 millimeters, one section OA from the pipeline center of circle to duct wall has the survey pitot aperture 3 of the flow path direction that meets water, have on another section OB along the static-pressure inlet 4 of current piezometric tube tangential direction, the quantity of pressure tap is OA, on the OB section each 10, the area of each pressure tap and pitch of holes draw according to formula (1): when adopting the hole diameter area to be 3 millimeters, then pitch of holes is 1.7,6.8,15.3,27.2,42.5,61.2,83.3,108.8,137.7 170(unit is a millimeter).At two terminations, one water meter 5 of piezometric tube, can learn the water flow of water-supply-pipe like this from water meter.When the flow velocity luffing is big, can add the size that dynamic pressure plate 6 is regulated pressure tap on the piezometric tube.

Claims (3)

1, a kind of pipeline flowmeter, it is characterized in that in aqueduct, establishing a piezometric tube by this pipeline center of circle, one section the survey pitot aperture that meet water flow path direction arranged of piezometric tube from the pipeline center of circle to duct wall, have on another section along the static-pressure inlet of current piezometric tube tangential direction, at two terminations, one water meter of piezometric tube.

2, flowmeter according to claim 1, the quantity that it is characterized in that pressure tap is 5～20, the area of each pressure tap and pitch of holes must satisfy following formula:

(wherein ω AB is the area of passage of piezometric tube, and ω i is the pressure tap area, and L is a piezometric tube length, and li is the pressure tap spacing).

3, flowmeter according to claim 1 is characterized in that the size that pressure tap can be regulated its diameter by dynamic pressure plate (6).

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