CN201795815U - Anti-blocking type low-speed pipe flow meter - Google Patents

Anti-blocking type low-speed pipe flow meter Download PDF

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Publication number
CN201795815U
CN201795815U CN2010205047406U CN201020504740U CN201795815U CN 201795815 U CN201795815 U CN 201795815U CN 2010205047406 U CN2010205047406 U CN 2010205047406U CN 201020504740 U CN201020504740 U CN 201020504740U CN 201795815 U CN201795815 U CN 201795815U
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CN
China
Prior art keywords
low pressure
pipe
measuring pipe
pressure measuring
low
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Expired - Fee Related
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CN2010205047406U
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Chinese (zh)
Inventor
刘琨
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刘琨
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Priority to CN2010205047406U priority Critical patent/CN201795815U/en
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Publication of CN201795815U publication Critical patent/CN201795815U/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The utility model relates to an anti-blocking type low-speed pipe flow meter which consists of a pressure tapping conduit, an installing flange, a fixed seat, a total pressure measuring pipe, a low pressure measuring pipe and a low pressure trumpet pipe, wherein the pressure tapping conduit is respectively arranged at the upper parts of the total pressure measuring pipe and the low pressure measuring pipe, the total pressure measuring pipe and the low pressure measuring pipe are adjoining to each other in parallel and side by side and fixedly arranged with each other, the total pressure measuring pipe and the low pressure measuring pipe are jointly and fixedly arranged on the installing flange which is fixedly arranged on the wall of a measuring pipe, the total pressure measuring pipe is arranged at a water facing surface in the measuring pipe, the lower end of the total pressure measuring pipe is provided with a total pressure measuring hole, and the lower end of the low pressure measuring pipe is perpendicularly welded, fixedly provided with and communicated with the low pressure trumpet pipe. The flow meter has the characteristics of being stable in performance, high in precision, good in repeatability, convenient to install, hard to block, less in pressure loss, low in running cost, simple and reliable in structure and the like, being applied to measuring the low-flow speed gas, and being particularly applied to measuring the gas which is large in caliber and is higher in dust content of medium in the metallurgy industry, the electric power industry, the coal industry and the environmental protection industry.

Description

Block-resistant type low speed flowmeter for pipe
Technical field
The utility model belongs to the flow metering technical field, relates to gas meter, especially a kind of block-resistant type low speed flowmeter for pipe.
Background technology
Need carry out flow measurement at the air that contains dust that many industries produced, tail gas or coal gas pipelines such as electric power, metallurgy, combustion gas, owing to carry the pipe flow speed of above-mentioned medium lower, adopt the measured error ratio of existing flow instrument bigger, and flow instrument stops up easily, makes this class rate-of flow measurement become world-famous puzzle.At present domestic this class of carrying out is measured the flow instrument that is adopted and is mainly V awl, orifice plate, crust class even speed tube, pitot tube and plug-in type double-venturi tube etc.The differential pressure value that V awl, orifice plate have measurement is than advantage of higher, but also exist install, the unusual shortcoming of high, the easy obstruction of difficulty, the pressure loss of maintenance, some occasion even can't use; Crust class even speed tube, pitot tube have that the pressure loss is little, the characteristics of easy accessibility, but stop up easily when medium contains dust, and institute's error of measurement presses signal smaller, and measuring accuracy is lower; The plug-in type double-venturi tube is to produce the highest flow instrument of differential pressure signal in the plug-in type flow meter, dismounting is also more convenient, this is very favorable for the air or the coal gas flow that contain dust at the low flow velocity of industries such as electric power, metallurgy, combustion gas measurement, but, the plug-in type double-venturi tube is because structural limitations, the pressure port aperture has only φ 3~6mm, measures dirty gas and is easy to stop up.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, provides a kind of and can measure low flow velocity and not allow susceptible to plugging block-resistant type low speed flowmeter for pipe.
The utility model solves its technical matters and is achieved through the following technical solutions:
A kind of block-resistant type low speed flowmeter for pipe, by the pressure conduit, mounting flange, holder, the total head measuring tube, low pressure measurement pipe and low pressure oviduct constitute, the pressure conduit is installed in the top of total head measuring tube and low pressure measurement pipe respectively, total head measuring tube and low pressure measurement pipe be parallel side by side near and install, the total head measuring tube is identical with low pressure measurement pipe caliber and be packed in jointly on the mounting flange that the measuring channel tube wall installed, total head measuring tube in measuring channel is arranged on upstream face and is shaped on total head gaging hole mouth in its lower end, and the vertical welding in the lower end of low pressure measurement pipe installs and is communicated with the low pressure oviduct.
And described low pressure oviduct is arranged on the axis of measuring channel, and the oviduct interior shape is made up of the preceding section of contracting, throat, diffuser, and the preceding section of contracting is made the loudspeaker tubulose, and its angle is 45 °-75 °; Throat is straight length and the lower end that is communicated with the low pressure measurement pipe; Diffuser is also made the loudspeaker tubulose, and its angle is 6 °-15 °.
And ,-75 ° at 45 of described total head gaging hole mouth and rate of flow of fluid direction, low pressure measurement pipe and total head measuring tube adopt φ 12-φ 30mm aperture; The pressure aperture of low pressure oviduct, the throat aperture is corresponding with the low pressure measurement pipe also is φ 12-φ 30mm aperture.
Advantage of the present utility model and beneficial effect are:
1, this flowmeter is a kind of flow instrument based on differential pressure principle, is to design for solving the more abominable on-the-spot flow measurement of some working condition specially, can solve various dirty gases, a low flow rate of gas measurement difficult problem effectively.This flowmeter can with the supporting use of differential pressure transmitter, Displaying Meter or computing machine, can realize round pipe, the dirty gas of rectangular duct, low flow rate of gas flow measurement are difficult for stopping up.For the dirty gas of measuring industries such as electric power, metallurgy, combustion gas or contain air, tail gas or the coal gas flow of dust, will play very large effect.
2, this flowmeter performance is stable, precision is high, good reproducibility, simple installation, should not stop up, have characteristics such as the pressure loss is little, operating cost is low, simple and reliable for structure, be applicable to and measure low flow velocity, be particularly suitable for metallurgy, electric power, coal, environmental protection industry (epi) heavy caliber, the higher gas flow measurement of medium dust-laden.
Description of drawings
Fig. 1 is a structural front view of the present utility model;
Fig. 2 cuts open figure for the side axle of Fig. 1;
Fig. 3 is the sectional structure enlarged drawing of the low pressure oviduct of Fig. 2.
Embodiment
The utility model is described in further detail below by specific embodiment, and following examples are descriptive, is not determinate, can not limit protection domain of the present utility model with this.
A kind of block-resistant type low speed flowmeter for pipe, radially be installed on the measuring channel 6, flowmeter is made of pressure conduit 1, mounting flange 3, holder 4, total head measuring tube 5, low pressure measurement pipe 8 and low pressure oviduct 7, the pressure conduit is installed in the top of total head measuring tube and low pressure measurement pipe respectively, and on the pressure conduit stop valve 2 is installed all; On the measuring channel tube wall, install holder, on this holder mounting flange is installed, on mounting flange, install total head measuring tube and low pressure measurement pipe; The total head measuring tube installs near also welding for parallel side by side with the low pressure measurement pipe, the two caliber is identical, total head measuring tube in measuring channel is arranged on upstream face and is shaped on total head gaging hole mouth in its lower end,-75 ° at 45 of total head gaging hole mouth and rate of flow of fluid direction, the vertical welding in the lower end of low pressure measurement pipe install and are communicated with low pressure oviduct (being sensing head).
The low pressure oviduct is arranged on the axis of measuring channel, and the oviduct interior shape is made up of the preceding section of contracting 9, throat, diffuser 10, and the preceding section of contracting is the section of meeting water, and the preceding section of contracting is made the loudspeaker tubulose, and its angle is 45 °-75 °; Throat is straight length and the lower end that is communicated with the low pressure measurement pipe; Diffuser is also made the loudspeaker tubulose, and its angle is 6 °-15 °
Low pressure measurement pipe and total head measuring tube all adopt φ 12-φ 30mm aperture; The pressure aperture of low pressure oviduct, the throat aperture is corresponding with the low pressure measurement pipe also is φ 12-φ 30mm aperture.
Principle of work of the present utility model:
When fluid flow through block-resistant type low speed flowmeter for pipe sensing head, fluid flowed into sensing head oviduct inner chamber, and fluid flows to diffuser through contraction mouth, throat.Because the oviduct convection cell shrinks and diffusion, the static pressure that adds ambassador throat at the rate of flow of fluid of throat obviously descends.Have one over against the total head gaging hole that flows in the oviduct outside, measure the total head of this point.Differential pressure obtains amplifying between the static pressure of the interior throat of total head gaging hole and oviduct like this.Flow velocity is big more, and the differential pressure value that is produced is high more.Square being directly proportional of the differential pressure value of surveying with institute flow measurement value.
Anti-blocking principle of the present utility model:
The oviduct inner chamber is that throat diameter can be designed into φ 12-φ 30mm in pressure port aperture and the oviduct according to fluid mechanics principle and anti-blocking requirement design.When the impurity of fluid entered in the oviduct pressure port, because action of gravity, impurity can be fallen in the oviduct throat again, and the rate of flow of fluid in the oviduct throat is higher than the pipeline inner fluid speed, can very successfully impurity be blown away the effect (seeing figure) that reaches anti-blocking.Total head gaging hole internal diameter is that φ 12-φ 30mm pipe is made, and total head gaging hole mouth is done angled groove (seeing figure), and when the impurity of fluid entered in the ram-air pipe, because action of gravity, impurity can be fallen outside the total head gaging hole again.When the aperture reached φ 12-φ 30mm, the impurity in the aperture can not form capillarity and stop up.
Low fluid-velocity survey principle of the present utility model:
Block-resistant type low speed flowmeter for pipe is to come calculated flow rate by differential pressure between the static pressure of measuring throat in total head gaging hole and the oviduct.In the accelerating effect by oviduct of the rate of flow of fluid of throat, the flow velocity that makes throat increases and static pressure obviously descends, and the differential pressure of generation high measurement accuracy more is high more.For crust class even speed tube, pitot tube, what its low pressure end was surveyed is the interior static pressure of pipeline substantially.Therefore, under identical rate of flow of fluid, block-resistant type low speed flowmeter for pipe is higher than the differential pressure that crust class even speed tube, pitot tube produce.The result who block-resistant type low speed flowmeter for pipe model machine and the crust class on the market, the pitot tube of making is tested at University Of Tianjin's wind tunnel laboratory is: block-resistant type low speed flowmeter for pipe is higher by 45% than crust class differential pressure, and block-resistant type low speed flowmeter for pipe is higher by 98% than pitot tube differential pressure.

Claims (3)

1. block-resistant type low speed flowmeter for pipe, it is characterized in that: by the pressure conduit, mounting flange, holder, the total head measuring tube, low pressure measurement pipe and low pressure oviduct constitute, the pressure conduit is installed in the top of total head measuring tube and low pressure measurement pipe respectively, total head measuring tube and low pressure measurement pipe be parallel side by side near and install, the total head measuring tube is identical with low pressure measurement pipe caliber and be packed in jointly on the mounting flange that the measuring channel tube wall installed, total head measuring tube in measuring channel is arranged on upstream face and is shaped on total head gaging hole mouth in its lower end, and the vertical welding in the lower end of low pressure measurement pipe installs and is communicated with the low pressure oviduct.
2. block-resistant type low speed flowmeter for pipe according to claim 1, it is characterized in that: described low pressure oviduct is arranged on the axis of measuring channel, the oviduct interior shape is made up of the preceding section of contracting, throat, diffuser, and the preceding section of contracting is made the loudspeaker tubulose, and its angle is 45 °-75 °; Throat is straight length and the lower end that is communicated with the low pressure measurement pipe; Diffuser is also made the loudspeaker tubulose, and its angle is 6 °-15 °.
3. block-resistant type low speed flowmeter for pipe according to claim 1 is characterized in that :-75 ° at 45 of described total head gaging hole mouth and rate of flow of fluid direction, low pressure measurement pipe and total head measuring tube all adopt φ 12-φ 30mm aperture; The pressure aperture of low pressure oviduct, the throat aperture is corresponding with the low pressure measurement pipe also is φ 12-φ 30mm aperture.
CN2010205047406U 2010-08-25 2010-08-25 Anti-blocking type low-speed pipe flow meter Expired - Fee Related CN201795815U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2010205047406U CN201795815U (en) 2010-08-25 2010-08-25 Anti-blocking type low-speed pipe flow meter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2010205047406U CN201795815U (en) 2010-08-25 2010-08-25 Anti-blocking type low-speed pipe flow meter

Publications (1)

Publication Number Publication Date
CN201795815U true CN201795815U (en) 2011-04-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN2010205047406U Expired - Fee Related CN201795815U (en) 2010-08-25 2010-08-25 Anti-blocking type low-speed pipe flow meter

Country Status (1)

Country Link
CN (1) CN201795815U (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102384771A (en) * 2011-11-24 2012-03-21 王忠辉 Pressure sampling head of Pitotbar flow sensor
CN105372446A (en) * 2015-12-12 2016-03-02 中国航空工业集团公司西安飞机设计研究所 Differential pressure type wind speed measuring sensor and detecting device with same
CN105466510A (en) * 2015-12-17 2016-04-06 青岛中特环保仪器有限公司 Orifice flow meter provided with linear resistance regulator

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102384771A (en) * 2011-11-24 2012-03-21 王忠辉 Pressure sampling head of Pitotbar flow sensor
CN105372446A (en) * 2015-12-12 2016-03-02 中国航空工业集团公司西安飞机设计研究所 Differential pressure type wind speed measuring sensor and detecting device with same
CN105466510A (en) * 2015-12-17 2016-04-06 青岛中特环保仪器有限公司 Orifice flow meter provided with linear resistance regulator
CN105466510B (en) * 2015-12-17 2019-03-19 青岛中特环保仪器有限公司 Orifice metre with linear resistance adjuster

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C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20110413

Termination date: 20140825

EXPY Termination of patent right or utility model