CN201348520Y - Concealed ring-type cone throttling device - Google Patents

Concealed ring-type cone throttling device Download PDF

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Publication number
CN201348520Y
CN201348520Y CNU2008202227861U CN200820222786U CN201348520Y CN 201348520 Y CN201348520 Y CN 201348520Y CN U2008202227861 U CNU2008202227861 U CN U2008202227861U CN 200820222786 U CN200820222786 U CN 200820222786U CN 201348520 Y CN201348520 Y CN 201348520Y
Authority
CN
China
Prior art keywords
ring
straight tube
pressure
throttling
pressure pipe
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
CNU2008202227861U
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Chinese (zh)
Inventor
徐思皓
龚燕平
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.)
SHANXI YIXIN MONITORING INSTRUMENTS CO Ltd
Original Assignee
SHANXI YIXIN MONITORING INSTRUMENTS 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
Application filed by SHANXI YIXIN MONITORING INSTRUMENTS CO Ltd filed Critical SHANXI YIXIN MONITORING INSTRUMENTS CO Ltd
Priority to CNU2008202227861U priority Critical patent/CN201348520Y/en
Application granted granted Critical
Publication of CN201348520Y publication Critical patent/CN201348520Y/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The utility model discloses a concealed ring-type cone throttling device, which comprises a measuring straight tube, wherein a front ring chamber and a rear ring chamber which are communicated with the measuring straight tube are arranged on the pipe wall of the measuring straight tube, a front pressure tapping and a rear pressure tapping which are connected with a connecting pipe are respectively arranged on the front ring chamber and the rear ring chamber, a throttling cone core is arranged between the front ring chamber and the rear ring chamber in the measuring straight tube, and the throttling cone core is composed of a front cone body, a middle throat part and a rear frustum and is arranged on one axial cord with the measuring straight tube. The concealed ring-type cone throttling device has simple structure, convenient use and operation, high measurement precision and small pressure difference loss, and demands that the distance between a front straight tube and a rear straight tube should be short when in installation.

Description

Built-in ring-like conical throttling gear
Technical field
The utility model relates to the flow instrument technical field, especially relates to a kind of built-in ring-like conical throttling gear.
Background technology
There is following shortcoming in existing big caliber gas differential pressure formula flowmeter: 1, often pressure is lower owing to tested gas, sometimes or even negative pressure, if adopt the plug-in type flow meter, its error of measurement presses signal very little, all is that elementary errors is pressed, if the standard of employing restriction device, as: standard orifice plate, also there is the minimum problem of differential pressure signal in meterings such as standard Venturi tube. approximately smaller or equal to about 100Pa, so measuring accuracy is very low and wayward.2, the standard restriction device is as standard orifice plate, the standard Venturi tube, and desired installation site is very harsh, and straight pipeline is 10 times more than the pipe diameter before general the requirement, and back straight pipeline is 5 times more than the pipe diameter.During fluid measurement, because pipeline often has annexes such as threeway, elbow, valve, so on-the-spot can not possess very long straight length, the limitation that this kind flowmeter is installed is big.3, generally has only the amplification differential pressure signal for pursuing measuring accuracy, reach the measuring accuracy of differential pressure transmitter, the artificial restricting element that dwindles, improve the differential pressure output signal, the result who does has like this caused the pressure loss of pipeline very big, and this loss is generally irrecoverable, and the requirement of the energy-saving and emission-reduction that this is also advocated with country is helped mutually.
The utility model content
Technical problem to be solved in the utility model is at above-mentioned deficiency of the prior art, a kind of built-in ring-like conical throttling gear is provided, and it is simple in structure, uses easy and simple to handle, the measuring accuracy height, straight length is apart from weak point before and after the little and installation requirement of difference pressuring loss.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of built-in ring-like conical throttling gear, it is characterized in that: comprise the measurement straight tube, the tube wall of described measurement straight tube is provided with and measures preceding ring casing and the back ring casing that straight tube communicates, ring casing and back are respectively arranged with the preceding pressure tappings that is connected connecting pipe and back pressure tappings on the ring casing before described, be positioned between the ring casing in preceding ring casing and back and measure straight tube and be provided with throttling awl core, described throttling awl core is connected to form by precentrum, middle throat and back frustum and is same axis setting with measuring straight tube.
Radially be provided with in the described measurement straight tube respectively and be communicated with preceding pressure pipe and the back pressure pipe of measuring straight tube and preceding ring casing, measuring straight tube and back ring casing, described before the pressure pipe and after have a plurality of pressure ports on the tube wall of pressure pipe.
Before described pressure port is positioned on the preceding tube wall of pressure pipe and on the side tube wall of back pressure pipe.
Described throttling awl core is fixed on by preceding pressure pipe and back pressure pipe and measures in the straight tube, and wherein, precentrum and preceding pressure pipe are welded to connect, and back frustum is welded to connect with back pressure pipe.
The rear fender of described back frustum is the seal cones sensor.
Ring casing and back are respectively arranged with a plurality of clean-out openings that are used to purge with blowdown on the ring casing before described.
The tube wall of described measurement straight tube is provided with and is used for the detection hole that online reality is failed to be sold at auction and decided calibration.
The place ahead of ring casing before described detection hole is positioned at.
The rear and front end of described measurement straight tube is provided with joint flange.
The utility model compared with prior art has the following advantages:
1, rational in infrastructure, easy to use.The utility model shows that with differential pressure transmitter, valve group, temperature or pressure unit, flow integrating instrument or flow computer etc. cooperate the composition differential pressure flowmeter, hydrostatic pressure difference by between pressure tappings before measuring and the back pressure tappings, utilize law of conservation of energy again---bernoulli equation and mobile continuity equation record the pipeline fluid flow for the flow-measuring method on basis.
2, experiment showed, that the air-flow velocity in this throttling device has improved more than 3-5 times, and supporting with it differential pressure transmitter amplitude output signal is improved greatly, improved the measuring accuracy of flowmeter, make robotization control more be tending towards desirable.
3, through a large amount of wind tunnel experiment checkings, straight length only needs 3 times of pipe diameters before this built-in ring-like conical throttling gear, and back straight length only needs 2 times of pipe diameters, has saved installing space greatly, has reduced unnecessary installation cost.
4, the novel air-flow fluid pressure loss that makes of this use approximately has only about 3% of differential pressure signal, has reduced about 25% than the general standard restriction device pressure loss.
5, applied widely: the utility model mainly is applicable to the detection of other flows such as coal gas, pressurized air, oxygen and nitrogen of the big caliber of low-pressure.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Description of drawings
Fig. 1 is an one-piece construction synoptic diagram of the present utility model.
Description of reference numerals:
The 1-joint flange; 2-detects the hole; Pressure tappings before the 3-;
Ring casing before the 4-; Throat in the middle of the 5-; Pressure tappings behind the 6-;
Ring casing behind the 7-; 8-measures straight tube; Frustum behind the 9-;
The 10-rear fender; Pressure pipe behind the 11-; The 12-clean-out opening;
The 13-precentrum; Pressure pipe before the 14-; The 15-pressure port.
Embodiment
As shown in Figure 1, the utility model comprises measures straight tube 8, the tube wall of measuring straight tube 8 is provided with and measures the preceding ring casing 4 and back ring casing 7 that straight tube 8 communicates, before ring casing 4 and back be respectively arranged with the preceding pressure tappings 3 that is connected connecting pipe and back pressure tappings 6 on the ring casing 7, ring casing 4 and back ring casing 7 adopted the ring casing ways of measure pressure before the utility model utilized, make the differential pressure output signal more stable, be convenient to operation and control.Be positioned between the ring casing 7 in preceding ring casing 4 and back and measure straight tube 8 and be provided with throttling awl core, described throttling awl core is connected to form by precentrum 13, middle throat 5 and back frustum 9, and described throttling awl core is same axis setting with measuring straight tube 8.The utility model shows that with differential pressure transmitter, valve group, temperature or pressure unit, flow integrating instrument or flow computer etc. cooperate the composition differential pressure flowmeter, hydrostatic pressure difference by between pressure tappings 3 before measuring and the back pressure tappings 6, utilize law of conservation of energy again---bernoulli equation and mobile continuity equation record the pipeline fluid flow for the flow-measuring method on basis.Wherein, throttling is bored core and is measured between the straight tube 8 and forms flow channels, through the air-flow velocity change of precentrum 13, flow velocity is accelerated more than 3-5 times; Middle throat 5 makes the air-flow a fluid stream after quickening stable, is difficult for fluctuation, makes differential pressure signal stable then, helps the robotization control operation; Back frustum 9 is the pressure releasing section, and it recovers the stream pressure loss gradually, greatly reduces the pressure loss. recovered energy.
Measure and radially be provided with preceding pressure pipe 14 and back pressure pipe 11 in the straight tube 8, before have a plurality of pressure ports 15 on pressure pipe 14 tube walls and be communicated with and measure straight tube 8 and preceding ring casing 4, have a plurality of pressure ports 15 on back pressure pipe 11 tube walls and be communicated with measure straight tube 8 with after ring casing 7.Wherein, preferred version is: before pressure port 15 is positioned on the preceding tube wall of pressure pipe 14 or on the side pipe wall of back pressure pipe 11, this head-on and the side ways of measure pressure, avoided particle in the air-flow and dirty medium to enter in the pressure pipe and resulted in blockage.
Throttling awl core is fixed on by preceding pressure pipe 14 and back pressure pipe 11 and measures in the straight tube 8, and wherein, precentrum 13 is welded to connect with preceding pressure pipe 14, and back frustum 9 is welded to connect with back pressure pipe 11.The rear fender 10 of back frustum 9 is the seal cones sensor, and the effect of seal cones sensor is to avoid solid particle, dust or liquid impurity in the air-flow to enter in the throttling awl core.
Before be respectively arranged with a plurality of clean-out openings 12 that are used to purge with blowdown on ring casing 4 and the back ring casing 7, air-flow can be brought into the solid particle measured in the straight tube 8 or dust by clean-out opening 12 and purge totally, and the liquid impurity of measuring in the straight tube 8 can be discharged totally at any time.
In addition, the tube wall of measuring straight tube 8 is provided with and is used for the detection hole 2 that online reality is failed to be sold at auction and decided calibration, detect the place ahead that hole 2 is positioned at preceding ring casing 4, reason such as if the design point that provides owing to technological parameter reason or this flowmeter is inaccurate, and the flowmeter survey that causes is unpunctual, can flowmeter be carried out online reality fail to be sold at auction and decide calibration by detecting hole 2. make more to meet on-the-spot actually, meet technological requirement.
The rear and front end of measuring straight tube 8 is provided with the joint flange 1 that is connected with airflow line.
The above; it only is preferred embodiment of the present utility model; be not that the utility model is imposed any restrictions; every according to the utility model technical spirit to any simple modification, change and equivalent structure transformation that above embodiment did, all still belong in the protection domain of technical solutions of the utility model.

Claims (9)

1. built-in ring-like conical throttling gear, it is characterized in that: comprise and measure straight tube (8), the tube wall of described measurement straight tube (8) is provided with and measures preceding ring casing (4) and the back ring casing (7) that straight tube (8) communicates, be respectively arranged with the preceding pressure tappings (3) and the back pressure tappings (6) that are connected connecting pipe before described on ring casing (4) and back ring casing (7), be positioned at measurement straight tube (8) and be provided with throttling awl core between preceding ring casing (4) and back ring casing (7), described throttling awl core is by precentrum (13), middle throat (5) and back frustum (9) connect to form and are same axis setting with measurement straight tube (8).
2. according to the described built-in ring-like conical throttling gear of claim 1, it is characterized in that: radially be provided with in the described measurement straight tube (8) respectively and be communicated with preceding pressure pipe (14) and the back pressure pipe (11) of measuring straight tube (8) and preceding ring casing (4), measuring straight tube (8) and back ring casing (7), described before pressure pipe (14) and after have a plurality of pressure ports (15) on the tube wall of pressure pipe (11).
3. according to the described built-in ring-like conical throttling gear of claim 2, it is characterized in that: before described pressure port (15) is positioned on the preceding tube wall of pressure pipe (14) and on the side tube wall of back pressure pipe (11).
4. according to claim 2 or 3 described built-in ring-like conical throttling gears, it is characterized in that: described throttling awl core is fixed on by preceding pressure pipe (14) and back pressure pipe (11) to be measured in the straight tube (8), wherein, precentrum (13) is welded to connect with preceding pressure pipe (14), and back frustum (9) is welded to connect with back pressure pipe (11).
5. according to the described built-in ring-like conical throttling gear of claim 3, it is characterized in that: the rear fender (10) of described back frustum (9) is the seal cones sensor.
6. according to claim 1,2 or 3 described built-in ring-like conical throttling gears, it is characterized in that: ring casing (4) and afterwards being respectively arranged with on the ring casing (7) is used to purge a plurality of clean-out openings (12) with blowdown before described.
7. according to claim 1,2 or 3 described built-in ring-like conical throttling gears, it is characterized in that: the tube wall of described measurement straight tube (8) is provided with and is used for the detection hole (2) that online reality is failed to be sold at auction and decided calibration.
8. according to the described built-in ring-like conical throttling gear of claim 7, it is characterized in that: described detection hole (2) is positioned at the place ahead of preceding ring casing (4).
9. according to claim 1,2 or 3 described built-in ring-like conical throttling gears, it is characterized in that: the rear and front end of described measurement straight tube (8) is provided with joint flange (1).
CNU2008202227861U 2008-12-05 2008-12-05 Concealed ring-type cone throttling device Expired - Fee Related CN201348520Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNU2008202227861U CN201348520Y (en) 2008-12-05 2008-12-05 Concealed ring-type cone throttling device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNU2008202227861U CN201348520Y (en) 2008-12-05 2008-12-05 Concealed ring-type cone throttling device

Publications (1)

Publication Number Publication Date
CN201348520Y true CN201348520Y (en) 2009-11-18

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102012331A (en) * 2010-11-04 2011-04-13 煤炭科学研究总院重庆研究院 Gas and pressure measuring method with anti-clogging function for gas measurement
CN103424149A (en) * 2013-08-06 2013-12-04 江苏科技大学 Olive-shaped differential pressure flow meter
CN108896438A (en) * 2018-07-25 2018-11-27 重庆大学 Bottom hole gas bearing capacity measuring device and measurement method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102012331A (en) * 2010-11-04 2011-04-13 煤炭科学研究总院重庆研究院 Gas and pressure measuring method with anti-clogging function for gas measurement
CN102012331B (en) * 2010-11-04 2012-04-04 煤炭科学研究总院重庆研究院 Gas and pressure measuring method with anti-clogging function for gas measurement
CN103424149A (en) * 2013-08-06 2013-12-04 江苏科技大学 Olive-shaped differential pressure flow meter
CN108896438A (en) * 2018-07-25 2018-11-27 重庆大学 Bottom hole gas bearing capacity measuring device and measurement method

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

Granted publication date: 20091118

Termination date: 20161205

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