CN203069216U - Annular orifice plate flowmeter - Google Patents

Annular orifice plate flowmeter Download PDF

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Publication number
CN203069216U
CN203069216U CN 201220729655 CN201220729655U CN203069216U CN 203069216 U CN203069216 U CN 203069216U CN 201220729655 CN201220729655 CN 201220729655 CN 201220729655 U CN201220729655 U CN 201220729655U CN 203069216 U CN203069216 U CN 203069216U
Authority
CN
China
Prior art keywords
hole
measuring tube
dust
negative pressure
grading ring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN 201220729655
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Chinese (zh)
Inventor
吴建峰
赵建军
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SHENZHOU OBSERVATION AND CONTROL EQUIPMENT CO Ltd
Original Assignee
SHENZHOU OBSERVATION AND CONTROL EQUIPMENT CO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Priority to CN 201220729655 priority Critical patent/CN203069216U/en
Application granted granted Critical
Publication of CN203069216U publication Critical patent/CN203069216U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model discloses an annular orifice plate flowmeter which comprises a measuring tube and a circular plate which is perpendicularly arranged inside the measuring tube. The center line of the circular plate is overlapped with the center line of the measuring tube, the diameter of the circular plate is smaller than the diameter of the measuring tube, a positive pressure measuring device and a negative pressure measuring device are arranged on the measuring tube respectively, and the positive pressure measuring device and the negative pressure measuring device are located on two sides of the circular plate respectively. Therefore, various to-be-measured dirty media can pass through the circular seams between pipelines of an orifice plate easily, and thus measurement accuracy is high.

Description

A kind of annular orifice flowmeter
Technical field
The utility model relates to the measuring appliance of fluid flow, particularly a kind of annular orifice flowmeter.
Background technology
At present, be applicable to the large-caliber flow measurement, namely be applied to water power, light textile, oil, metallurgical, in the industries such as chemical industry to liquid, gas, the flow measurement of media such as steam and the flowmeter of control, usually use orifice flowmeter, yet for containing various impurity (dust, suspend, precipitation etc.) fluid, as saturated vapour, pressurized air, various coal gas, rock gas, burnt gas, recirculated water, waste water, residual oil, heavy oil, chilled water, condensed fluid, during with the measurement of various corrosivity chemical industry solutions and various fluid media (medium)s etc., orifice plate is as easy as rolling off a log blocked, measuring accuracy is relatively poor, during for the measurement of high-temperature, high pressure fluid, owing to expand with heat and contract with cold, orifice plate physical dimension is changed easily, then influence efflux coefficient, also influential accordingly to measuring accuracy.
The utility model content
The purpose of this utility model is to overcome the defective that exists in the prior art, and a kind of annular orifice flowmeter is provided, and the various dirty medium of measurement can easily be passed through by the circumferential weld between circular slab and the pipeline time, and measuring accuracy is higher.
For achieving the above object, the technical solution of the utility model has provided a kind of annular orifice flowmeter, comprise measuring tube, be vertically installed in the circular slab of described measuring tube inside, the center line of described circular slab and the center line of described measuring tube coincide, the diameter of described circular slab is less than the caliber of described measuring tube, be respectively arranged with positive pressure obtaning device and negative pressure obtaning device on the described measuring tube, described positive pressure obtaning device and described negative pressure obtaning device lay respectively at the both sides of described circular slab.
As preferably, the two ends up and down of described circular slab are fixedly connected by the inwall of L type bracing frame and described measuring tube respectively.
As preferably, described positive pressure obtaning device comprises positive grading ring pipe, the pressure pipe of officiallying enroll that is connected with described positive grading ring pipe, the inwall of described positive grading ring pipe offers four malleation through holes, correspondingly offer four first through holes on the described measuring tube, described malleation through hole is connected by first connecting pipe with corresponding described first through hole, the outer wall of described positive grading ring pipe offers four first dust exhausting holes, the described first dust exhausting hole place is provided with first dust flue, the end of described first dust flue is provided with the first dust discharge plug, described malleation through hole, described first through hole, the center line of described first dust exhausting hole coincides, and the described pressure pipe of officiallying enroll is wherein between two adjacent described first dust flues.
As preferably, described negative pressure obtaning device comprises negative grading ring pipe, the negative pressure pipe that is connected with described negative grading ring pipe, the inwall of described negative grading ring pipe offers four negative pressure through-hole, correspondingly offer four second through holes on the described measuring tube, described negative pressure through-hole is connected by second connecting pipe with corresponding described second through hole, the outer wall of described negative grading ring pipe offers four second dust exhausting holes, the described second dust exhausting hole place is provided with second dust flue, the end of described second dust flue is provided with the second dust discharge plug, described negative pressure through-hole, described second through hole, the center line of described second dust exhausting hole coincides, and described negative pressure pipe is wherein between two adjacent described second dust flues.
As preferably, the two ends of described measuring tube fixedly install the joint flange that is useful on connection respectively.
Advantage of the present utility model and beneficial effect are:
1, is applicable to the fluid that contains various impurity (dust, suspension, precipitation etc.), be difficult for to stop up, the condensate water that steam forms when making that impurity is unblocked and stopping vapour in time flows away, thereby has improved functional reliability and measuring accuracy, efflux coefficient is stable under mal-condition, the precision height, good reliability uses annular orifice to measure fluid flow, be difficult for stopping up pressure port, because geometric configuration is simple, can Precision Machining and assembling, improve measuring accuracy;
2, be applicable to high-temperature, high pressure fluid, reliable operation, durable, cost is low, as superheated vapor, saturated vapor.When annular orifice was measured high temperature fluid, flow measurement plate periphery was free state, and temperature expansion only changes physical dimension, does not change edge sharpness and shape, did not therefore change efflux coefficient, did not influence measuring accuracy; When measuring high-pressure fluid, because of circular slab in measuring tube inside, irrelevant with the height of static pressure, can obtain good precision;
3, itself be with one section measuring tube, and this product price is lower than the standard orifice plate of band straight length;
4, can adopt " grading ring " pressure structure, reduce the measuring error source, not only weaken the influence of flow field, upstream disturbance to measurement, and owing to each 4 of pressure tappings front and back, be not easy to be stopped up inefficacy by foul.
Description of drawings
Fig. 1 is the utility model synoptic diagram;
Fig. 2 is the A-A place cut-open view of Fig. 1.
Among the figure: 1, measuring tube; 2, circular slab; 3, bracing frame; 4, positive grading ring pipe; 5, the pressure pipe of officiallying enroll; 6, malleation through hole; 7, first through hole; 8, first connecting pipe; 9, first dust exhausting hole; 10, first dust flue; 11, the first dust discharge plug; 12, negative grading ring pipe; 13, negative pressure pipe; 14, negative pressure through-hole; 15, second through hole; 16, second connecting pipe; 17, second dust exhausting hole; 18, second dust flue; 19, the second dust discharge plug; 20, joint flange.
Embodiment
Below in conjunction with drawings and Examples, embodiment of the present utility model is further described.Following examples only are used for the technical solution of the utility model more clearly is described, and can not limit protection domain of the present utility model with this.
As shown in Figure 1, a kind of annular orifice flowmeter, comprise measuring tube 1, be vertically installed in the circular slab 2 of described measuring tube 1 inside, the center line of the center line of described circular slab 2 and described measuring tube 1 coincides, the diameter of described circular slab 2 is less than the caliber of described measuring tube 1, be respectively arranged with positive pressure obtaning device and negative pressure obtaning device on the described measuring tube 1, described positive pressure obtaning device and described negative pressure obtaning device lay respectively at the both sides of described circular slab 2.
As shown in Figure 1, the two ends up and down of described circular slab 2 are fixedly connected by the inwall of L type bracing frame 3 with described measuring tube 1 respectively.
As Fig. 1-shown in Figure 2, described positive pressure obtaning device comprises positive grading ring pipe 4, the pressure pipe 5 of officiallying enroll that is connected with described positive grading ring pipe 4, the inwall of described positive grading ring pipe 4 offers four malleation through holes 6, correspondingly offer four first through holes 7 on the described measuring tube 1, described malleation through hole 6 is connected by first connecting pipe 8 with corresponding described first through hole 7, the outer wall of described positive grading ring pipe 4 offers four first dust exhausting holes 9, described first dust exhausting hole 9 places are provided with first dust flue 10, the end of described first dust flue 10 is provided with the first dust discharge plug 11, described malleation through hole 6, described first through hole 7, the center line of described first dust exhausting hole 9 coincides, and the described pressure pipe 5 of officiallying enroll is wherein between two adjacent described first dust flues 10; Described negative pressure obtaning device comprises negative grading ring pipe 12, the negative pressure pipe 13 that is connected with described negative grading ring pipe 12, the inwall of described negative grading ring pipe 12 offers four negative pressure through-hole 14, correspondingly offer four second through holes 15 on the described measuring tube 1, described negative pressure through-hole 14 is connected by second connecting pipe 16 with corresponding described second through hole 15, the outer wall of described negative grading ring pipe 12 offers four second dust exhausting holes 17, described second dust exhausting hole 17 places are provided with second dust flue 18, the end of described second dust flue 18 is provided with the second dust discharge plug 19, described negative pressure through-hole 14, described second through hole 15, the center line of described second dust exhausting hole 17 coincides, and described negative pressure pipe 13 is wherein between two adjacent described second dust flues 18.
As shown in Figure 1, the two ends of described measuring tube 1 fixedly install the joint flange 20 that is useful on connection respectively.
The ultimate principle of annular orifice flowmeter foundation is the same with standard orifice plate, be fluid continuity equation and bernoulli equation, difference is after fluid enters 1 section of measuring tube, minimum flow area is different, the minimum flow area of orifice flowmeter is the circular hole at plate center, when fluid accelerates to measure flow because of the circulation area sudden contraction during by circular hole, and the minimum flow area of annular orifice flowmeter is the outer rim of circular slab 2 and the annulus that measuring tube 1 inwall forms, fluid by the time accelerate because of the sudden contraction of circulation area, when fluid is walked around the edge of circular slab 2 and the boundary-layer that produces will be cylindrical, the resistance principle that convection cell produces is close, so the resistance coefficient that annular orifice flowmeter convection cell causes is more close, and this just makes both might have close efflux coefficient.
The annular orifice flowmeter is applicable to the measurement of various fluid media (medium)s (gas, steam, liquid), for example saturated vapour, superheated vapor, pressurized air, various coal gas, waste gas, chilled water, heavy oil, residual oil, fuel oil, condensed fluid, various chemical industry solutions etc.The annular orifice flowmeter has standard orifice plate characteristics simple in structure, firm, easy to install, need not long straight length simultaneously, has the advantage of working under abominable pipeline condition.
The above only is preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model know-why; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.

Claims (5)

1. annular orifice flowmeter, it is characterized in that: comprise measuring tube, be vertically installed in the circular slab of described measuring tube inside, the center line of described circular slab and the center line of described measuring tube coincide, the diameter of described circular slab is less than the caliber of described measuring tube, be respectively arranged with positive pressure obtaning device and negative pressure obtaning device on the described measuring tube, described positive pressure obtaning device and described negative pressure obtaning device lay respectively at the both sides of described circular slab.
2. annular orifice flowmeter as claimed in claim 1, it is characterized in that: the two ends up and down of described circular slab are fixedly connected by the inwall of L type bracing frame and described measuring tube respectively.
3. annular orifice flowmeter as claimed in claim 1, it is characterized in that: described positive pressure obtaning device comprises positive grading ring pipe, the pressure pipe of officiallying enroll that is connected with described positive grading ring pipe, the inwall of described positive grading ring pipe offers four malleation through holes, correspondingly offer four first through holes on the described measuring tube, described malleation through hole is connected by first connecting pipe with corresponding described first through hole, the outer wall of described positive grading ring pipe offers four first dust exhausting holes, the described first dust exhausting hole place is provided with first dust flue, the end of described first dust flue is provided with the first dust discharge plug, described malleation through hole, described first through hole, the center line of described first dust exhausting hole coincides, and the described pressure pipe of officiallying enroll is wherein between two adjacent described first dust flues.
4. annular orifice flowmeter as claimed in claim 1, it is characterized in that: described negative pressure obtaning device comprises negative grading ring pipe, the negative pressure pipe that is connected with described negative grading ring pipe, the inwall of described negative grading ring pipe offers four negative pressure through-hole, correspondingly offer four second through holes on the described measuring tube, described negative pressure through-hole is connected by second connecting pipe with corresponding described second through hole, the outer wall of described negative grading ring pipe offers four second dust exhausting holes, the described second dust exhausting hole place is provided with second dust flue, the end of described second dust flue is provided with the second dust discharge plug, described negative pressure through-hole, described second through hole, the center line of described second dust exhausting hole coincides, and described negative pressure pipe is wherein between two adjacent described second dust flues.
5. annular orifice flowmeter as claimed in claim 1, it is characterized in that: the two ends of described measuring tube fixedly install the joint flange that is useful on connection respectively.
CN 201220729655 2012-12-26 2012-12-26 Annular orifice plate flowmeter Expired - Fee Related CN203069216U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201220729655 CN203069216U (en) 2012-12-26 2012-12-26 Annular orifice plate flowmeter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201220729655 CN203069216U (en) 2012-12-26 2012-12-26 Annular orifice plate flowmeter

Publications (1)

Publication Number Publication Date
CN203069216U true CN203069216U (en) 2013-07-17

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Application Number Title Priority Date Filing Date
CN 201220729655 Expired - Fee Related CN203069216U (en) 2012-12-26 2012-12-26 Annular orifice plate flowmeter

Country Status (1)

Country Link
CN (1) CN203069216U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105043448A (en) * 2015-08-12 2015-11-11 银川融神威自动化仪表厂(有限公司) Large-caliber middle-high velocity flow velocity meter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105043448A (en) * 2015-08-12 2015-11-11 银川融神威自动化仪表厂(有限公司) Large-caliber middle-high velocity flow velocity meter
CN105043448B (en) * 2015-08-12 2017-06-16 银川融神威自动化仪表厂(有限公司) High flow rate flowmeter in a kind of heavy caliber

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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: 20130717

Termination date: 20171226

CF01 Termination of patent right due to non-payment of annual fee