CN2239614Y - Ohm-type centrifugal flow sensor - Google Patents

Ohm-type centrifugal flow sensor Download PDF

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Publication number
CN2239614Y
CN2239614Y CN 95231612 CN95231612U CN2239614Y CN 2239614 Y CN2239614 Y CN 2239614Y CN 95231612 CN95231612 CN 95231612 CN 95231612 U CN95231612 U CN 95231612U CN 2239614 Y CN2239614 Y CN 2239614Y
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China
Prior art keywords
flow sensor
water inlet
outlet pipe
utility
model
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Expired - Fee Related
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CN 95231612
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Chinese (zh)
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李溪婷
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Individual
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Individual
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Priority to CN 95231612 priority Critical patent/CN2239614Y/en
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Publication of CN2239614Y publication Critical patent/CN2239614Y/en
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Abstract

The utility model belongs to a device for measuring flow capacity, the structure is an omega type structure, the utility model is composed of a water inlet and outlet pipe, and a meter body is arranged in the middle part. The water inlet and outlet pipe is in external connection with a flange plate, a comb device is arranged in the water inlet and outlet pipe, the meter body is a semicircle rectangular cross-section flow path, a pressure guide hole and a pressure guide chamber are arranged in the meter body, and the outer side of the pressure guide hole is connected with a differential pressure sensor for measuring the internal flow capacity. The utility model has the advantages of simple structure, bidirectional measurement, smooth internal tube surface, high measuring precision and small resistance loss. The utility model is suitable for measuring fluid in various industries such as chemical industry, metallurgy, environmental protection, etc.

Description

The centrifugal flow sensor of " Ω " type
The utility model belongs to a kind of device of measuring flow.
At present, the nearest centrifugal flowmeter of adopted a kind of " U " type, its structure is by the import straight tube, outlet straight tube and half middle garden mozzle are formed, on the interior lateral wall of 120 ° of import straight tubes~160 ° of half garden mozzle, having 3~5 pressure ports that are evenly distributed up and down, and radial symmetry, on the pressure port inside and outside wall, set up the pressure chamber, the below perforate of pressure chamber is connected with hollow tubular, be lined with the identical high construction material of anticorrosion smoothness of this table body structure in the pipe, advantage is: the centrifugal flowmeter structure of this kind " U " type is simple, cost is low, deficiency be pressure port in 120 °~160 ° scopes, inconvenience is installed, and promptly can not guarantee level and vertical installation, casting in addition, smooth finish, size can not guarantee that throughput ratio is little, and throughput ratio is 1: 5, can only reach 1%, because the restriction of structure and job operation, the low discharge error that the fluid friction resistance causes is big, causes the bound throughput ratio little.
For solving the deficiency of above flowmeter structure, the purpose of this utility model the provides centrifugal flow sensor of a kind of " Ω " shape utilizes the different interface of the line of apsides, realizes the high-acruracy survey of convection cell, to reach purpose easy to install.
Structural design of the present utility model is to realize like this, this flow sensor is " Ω " type structure, one end is a water inlet pipe, the other end is a rising pipe, water inlet pipe and water outlet pipe can be long formula or short formula as required, the termination of water inlet pipe and water outlet pipe is welded with standard flange, it in the middle of water inlet pipe and water outlet pipe the table body that has half garden shape rectangular cross section circulation passage, this table body is all formed by machining, surface smoothness is 7 (surface irregularities≤1.6 μ m, the dimensioned error≤± 0.05mm, tracting pressuring hole is selected in the streamline that enters the mouth and becomes 90 ° to locate, so range ratio expands to 10: 1, precision≤± 1%, have higher smooth finish and dimensional accuracy, can serve as a contrast poly-tetrafluoro as required, the stagnant material of the sticking oil of epoxy resin or spraying teflon, in the inflow point of pipeline comb stream device is housed, so that make fluid steady in short to the greatest extent distance, the exit of this bi-directional flow sensor also installs comb stream device additional, adds tracting pressuring hole in the middle of bending table body, tracting pressuring hole is the narrow groove of same opening 2mm radially, the outside of tracting pressuring hole is the impulse chamber, respectively has the threaded hole of M20 * 1.5 up and down, so that connect with differential pressure pickup.
The principle of work of this device:
When fluid straight-tube portion stable enter half garden shape rectangular cross section passage the time, flow rate of fluid can change according to hydromechanical continuity theorem, accelerate in the mid-channel outside, inboard slack-off, mid-channel is constant.According to Newton second law, the fluid of making garden Zhou Yundong can produce a centrifugal force to inside and outside wall, and outside wall surface is big, internal face is little, thereby can produce an outside for just, inboardly is negative pressure differential, square being directly proportional of this pressure differential and rate of flow of fluid (flow just), promptly Qv = k ΔP / ρ K only shows coefficient, i.e. K=Ha 2Rc, H is a rectangular cross section width radially in the formula, and a is the rectangular cross section height, and Rc is the mid-channel radius.
Do not consider fricting resistance loss in the formula, since outer tracting pressuring hole to the inlet apart from greater than interior pressure hole to the distance that enters the mouth, so can produce a positive additional pressure reduction that causes by frictional resistance in outer negative, because during low discharge, the output of flow sensor pressure reduction is little, so it is bigger to add the pressure reduction influence, causes the small flowmeter accuracy of measurement low, range ratio is little, just can accurately obtain in the unit interval flow value by sensor by the corresponding relation of above formula and flow.
The utility model has following advantage compared with the prior art: import and export symmetrical structure because this device adopts, but so bidirectional measurement, but installing any direction placement, this flow do not influence measuring accuracy, because machining, inner smooth surface, the measuring accuracy height, drag losses is little, the suitable material wide ranges, do not influence the work operation of trunk roads, this device is applicable to that various industrial sectors such as oil, chemical industry, metallurgy, environmental protection do fluid measurement and use.
The utility model detailed structure is provided by following examples and accompanying drawing:
Fig. 1 is the centrifugal flow sensor structure principle chart of " Ω " type;
Fig. 2 is the centrifugal flow sensor side-looking of " Ω " type structural drawing;
Fig. 3 is the centrifugal flow sensor projection structure of " Ω " type figure.
Its structure is shown in Figure 1, and 1 is water inlet pipe; 7 is rising pipe, otherwise also can; 2 is the flow sensor loam cake; 3 are comb stream device, import and export comb stream device all is installed; 5 is tracting pressuring hole; 6 is the impulse chamber; 1,7 can extend or shorten as required, as shown in Figure 2, tracting pressuring hole connect cause on the differential pressure transmitter during lengthening because the inside and outside differential pressure that centrifugal force produces can calculate the flow value of unit interval by conduit by formula.

Claims (3)

1. centrifugal flow sensor of " Ω " type, form by water main and table body, it is characterized in that this flow sensor is " Ω " type structure, comb stream device (3) is housed in water inlet pipe and water outlet pipe (1) and (7), have higher smooth finish and dimensional accuracy in the table body (4), surface smoothness is 7 (surface irregularities≤1.6 μ m, the dimensioned error≤± 0.05mm, tracting pressuring hole (5) is selected in the streamline that enters the mouth and becomes 90 ° to locate, so range ratio expands to 10: 1, precision≤± 1%, tracting pressuring hole (5) outside is impulse chamber (6), water inlet pipe and water outlet pipe (1), (7) tube head is equipped with ring flange, can be short formula and long formula.
2. by the described flow sensor of claim 1, it is characterized in that tracting pressuring hole (5) is the narrow groove of same radial opening 2mm, impulse chamber (6) respectively have the threaded hole of M20 * 1.5 up and down.
3. by the described flow sensor of claim 1, it is characterized in that showing body (4) and can serve as a contrast the stagnant material of the sticking oil of poly-tetrafluoro, epoxy resin or spraying teflon.
CN 95231612 1995-07-05 1995-07-05 Ohm-type centrifugal flow sensor Expired - Fee Related CN2239614Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 95231612 CN2239614Y (en) 1995-07-05 1995-07-05 Ohm-type centrifugal flow sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 95231612 CN2239614Y (en) 1995-07-05 1995-07-05 Ohm-type centrifugal flow sensor

Publications (1)

Publication Number Publication Date
CN2239614Y true CN2239614Y (en) 1996-11-06

Family

ID=33876178

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 95231612 Expired - Fee Related CN2239614Y (en) 1995-07-05 1995-07-05 Ohm-type centrifugal flow sensor

Country Status (1)

Country Link
CN (1) CN2239614Y (en)

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C19 Lapse of patent right due to non-payment of the annual fee
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