CN104807509A - Differential pressure type flow measuring device capable of improving LPG flow measurement accuracy - Google Patents

Differential pressure type flow measuring device capable of improving LPG flow measurement accuracy Download PDF

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Publication number
CN104807509A
CN104807509A CN201410038244.9A CN201410038244A CN104807509A CN 104807509 A CN104807509 A CN 104807509A CN 201410038244 A CN201410038244 A CN 201410038244A CN 104807509 A CN104807509 A CN 104807509A
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China
Prior art keywords
differential
lpg
pressure
flow
connecting pipe
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Application number
CN201410038244.9A
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Chinese (zh)
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CN104807509B (en
Inventor
唐青
王乘东
谭子龙
蔡建培
宋孝林
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Shanghai Hualin Industrial Gas Co Ltd
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Shanghai Hualin Industrial Gas Co Ltd
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Priority to CN201410038244.9A priority Critical patent/CN104807509B/en
Publication of CN104807509A publication Critical patent/CN104807509A/en
Application granted granted Critical
Publication of CN104807509B publication Critical patent/CN104807509B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The invention relates to a differential pressure type flow measuring device capable of improving LPG flow measurement accuracy. The differential pressure type flow measuring device comprises an LPG flow pipeline, a differential-pressure perforated plate, pressure guide pipes and a differential-pressure flow transmitter; the differential-pressure perforated plate is arranged in the LPG flow pipeline; two pressure guide pipes are arranged, and the two ends of each pressure guide pipe are communicated with the LPG flow pipeline and the differential-pressure flow transmitter; a hand valve is arranged on the pressure guide pipe; a pressure guide branch pipe is arranged on the guide pressure pipe between the hand valve and the differential-pressure flow transmitter by use of a three-way joint, and a plug is connected to the end portion of the pressure guide branch pipe; the pressure guide branch pipe and the pressure guide pipe between the hand valve and the differential-pressure flow transmitter are fully filled with an LPG heavy density liquid. Compared with the prior art, the differential pressure type flow measuring device is the simple in structure and low in cost, capable of eliminating the influence of the LPG gasification to flow measurement, and convenient to use, and can be applied to liquid flow measurement in other similar fields; the use range of the differential pressure type flow measuring device is wide.

Description

A kind of differential flow measurement device improving LPG flow measurement accuracy
Technical field
The present invention relates to a kind of differential flow measurement device, especially relate to a kind of differential flow measurement device improving LPG flow measurement accuracy.
Background technology
LPG (liquefied petroleum gas (LPG)), than being easier to liquefaction, at normal temperatures and pressures in gaseous state, be easy to change liquid state into from gaseous state, and the LPG generally used at chemical enterprise is liquid form conveying under normal temperature pressurization or atmospheric low-temperature.When using differential pressure flowmeter to measure LPG flow, LPG is drawn from the house steward of flowing, and connecting pipe is comparatively thin, the LPG of extraction is again static, is easy to influenced by ambient temperature and occurs gasification, thus when causing measuring flow because of gasification flowmeter inaccurate.
Chinese patent CN100425954 discloses a kind of orifice throttle differential pressure type flow measurement method and flow measurement device of low pressure loss wide-range ratio.The method comprises: respectively by connecting pipe, the fluid pressure signal chewed with low pressure end pressure survey is chewed in high-pressure side pressure survey and be passed to differential pressure pickup; By differential pressure pickup detected pressures difference signal; Pressure difference signal is passed to extracting operation transmitter or intelligent controller or computing machine by differential pressure pickup, and obtains flow values by the pressure difference signal received.This apparatus structure is comparatively complicated, and cost is higher, does not have broad applicability.
Summary of the invention
Object of the present invention is exactly provide a kind of structure simply to improve the differential flow measurement device of LPG flow measurement accuracy to overcome defect that above-mentioned prior art exists, and this device can eliminate the problem causing flow measurement inaccurate because LPG easily gasifies.
Object of the present invention can be achieved through the following technical solutions:
A kind of differential flow measurement device improving LPG flow measurement accuracy, comprise LPG flow conduit, differential pressure orifice plate, connecting pipe and differential flow transmitter, described differential pressure orifice plate is located in LPG flow conduit, described connecting pipe is provided with two, the two ends of connecting pipe are communicated with LPG flow conduit and differential flow transmitter respectively, described connecting pipe is provided with hand valve, connecting pipe between hand valve with differential flow transmitter is connected pilot arm by threeway, the upper end of this pilot arm connects plug, inner and between hand valve and differential flow transmitter the connecting pipe inside of pilot arm is full of the liquid heavier than LPG density.
One end of one of them connecting pipe is communicated with the LPG flow conduit of differential pressure orifice plate side, the other end is communicated with the plemum of differential flow transmitter, one end of another connecting pipe is communicated with the LPG flow conduit of differential pressure orifice plate opposite side, and the other end is communicated with the negative pressure chamber of differential flow transmitter.
The liquid heavier than LPG density is selected from water or methyl alcohol.
The caliber size of described pilot arm is identical with connecting pipe.
Density heavier fluid is all full of due to from pilot arm to differential flow transmitter, LPG can not enter connecting pipe because density is light, such LPG gasification also can not occur in connecting pipe, therefore can eliminate the problem causing flow measurement inaccurate because LPG easily gasifies.
When using device of the present invention, carry out flow measurement by following steps:
(1) the plemum valve on differential flow transmitter, negative pressure chamber's valve and equalizing valve is opened;
(2) open the plug that two pilots prop up tube end, from a pilot props up the plug of tube end, fill with the liquid (as water or methyl alcohol) heavier than LPG, until the plug place that another root pilot props up tube end emerges by filling liquid;
(3) the plemum valve on shut off differential pressure formula flow transmitter, negative pressure chamber's valve and equalizing valve;
(4) plug is blocked;
(5) open hand valve, differential flow transmitter comes into operation.
Compared with prior art, structure of the present invention is simple, with low cost, can eliminate the impact of LPG gasification on flow measurement, and easy to use, and can apply and carry out liquid flow measurement with other similar field, usable range is wide.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
In figure, 1 is LPG flow conduit, and 2 is plug, and 3 is pilot arm, and 4 is connecting pipe, and 5 is differential flow transmitter, and 6 is hand valve, and 7 is differential pressure orifice plate.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment
A kind of differential flow measurement device improving LPG flow measurement accuracy, as shown in Figure 1, comprise LPG flow conduit 1, differential pressure orifice plate 7, connecting pipe 4 and differential flow transmitter 5, differential pressure orifice plate 7 is located in LPG flow conduit 1, connecting pipe 4 is provided with two, the two ends of connecting pipe are communicated with LPG flow conduit 1 and differential flow transmitter 5 respectively, connecting pipe 4 is provided with hand valve 6, connecting pipe 4 between hand valve 6 with differential flow transmitter 5 is connected pilot arm 3 by threeway, the upper end of this pilot arm 3 connects plug 2, inner and between hand valve 6 and differential flow transmitter 5 connecting pipe 4 inside of pilot arm 3 is full of the liquid heavier than LPG density.One end of one of them connecting pipe 4 is communicated with the LPG flow conduit 1 of differential pressure orifice plate 7 side, the other end is communicated with the plemum of differential flow transmitter 5, one end of another connecting pipe 4 is communicated with the LPG flow conduit 1 of differential pressure orifice plate 7 opposite side, and the other end is communicated with the negative pressure chamber of differential flow transmitter 5.The caliber size of pilot arm 3 is identical with connecting pipe 4.
LPG density ratio water is light, and proportion is about the half of water, and density is about 0.5-0.6g/cm 3between, it is 1.0g/cm that the liquid heavier than LPG density is selected from water-mass density 3or methanol density is 0.7914g/cm 3.
Owing to being all full of density heavier fluid from pilot arm 3 to differential flow transmitter 5, LPG can not enter connecting pipe 4 because density is light, such LPG gasification also can not occur in connecting pipe 4, therefore can eliminate the problem causing flow measurement inaccurate because LPG easily gasifies.
When using device of the present invention, carry out flow measurement by following steps:
(1) the plemum valve on differential flow transmitter, negative pressure chamber's valve and equalizing valve is opened;
(2) open the plug that two pilots prop up tube end, from a pilot props up the plug of tube end, fill with the liquid (as water or methyl alcohol) heavier than LPG, until the plug place that another root pilot props up tube end emerges by filling liquid;
(3) the plemum valve on shut off differential pressure formula flow transmitter, negative pressure chamber's valve and equalizing valve;
(4) plug is blocked;
(5) open hand valve, differential flow transmitter comes into operation.

Claims (4)

1. one kind is improved the differential flow measurement device of LPG flow measurement accuracy, comprise LPG flow conduit (1), differential pressure orifice plate (7), connecting pipe (4) and differential flow transmitter (5), described differential pressure orifice plate (7) is located in LPG flow conduit (1), described connecting pipe (4) is provided with two, the two ends of connecting pipe are communicated with LPG flow conduit (1) and differential flow transmitter (5) respectively, described connecting pipe (4) is provided with hand valve (6), it is characterized in that, connecting pipe (4) between hand valve (6) with differential flow transmitter (5) is connected pilot arm (3) by threeway, the upper end of this pilot arm (3) connects plug (2), inner and between hand valve (6) and differential flow transmitter (5) connecting pipe (4) inside of pilot arm (3) is full of the liquid heavier than LPG density.
2. a kind of differential flow measurement device improving LPG flow measurement accuracy according to claim 1, it is characterized in that, one end of one of them connecting pipe (4) is communicated with the LPG flow conduit (1) of differential pressure orifice plate (7) side, the other end is communicated with the plemum of differential flow transmitter (5), one end of another connecting pipe (4) is communicated with the LPG flow conduit (1) of differential pressure orifice plate (7) opposite side, and the other end is communicated with the negative pressure chamber of differential flow transmitter (5).
3. a kind of differential flow measurement device improving LPG flow measurement accuracy according to claim 1, is characterized in that, the liquid heavier than LPG density is selected from water or methyl alcohol.
4. a kind of differential flow measurement device improving LPG flow measurement accuracy according to claim 1, is characterized in that, the caliber size of described pilot arm (3) is identical with connecting pipe (4).
CN201410038244.9A 2014-01-26 2014-01-26 A kind of differential flow measurement device for improving LPG flow measurement accuracy Expired - Fee Related CN104807509B (en)

Priority Applications (1)

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CN201410038244.9A CN104807509B (en) 2014-01-26 2014-01-26 A kind of differential flow measurement device for improving LPG flow measurement accuracy

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Application Number Priority Date Filing Date Title
CN201410038244.9A CN104807509B (en) 2014-01-26 2014-01-26 A kind of differential flow measurement device for improving LPG flow measurement accuracy

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CN104807509B CN104807509B (en) 2018-06-12

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111766091A (en) * 2020-07-07 2020-10-13 西安航天动力试验技术研究所 Calibration system and method of low-frequency pulsation suppression device for ground test

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6286367B1 (en) * 1998-03-30 2001-09-11 Schlumberger Technology Corporation Method of evaluating the effluent of a hydrocarbon well by means of a multiphase flowmeter, and installation implementing the same
CN2594770Y (en) * 2002-11-13 2003-12-24 卢玖庆 Throttling differential pressure flowmeter
CN201787982U (en) * 2010-07-24 2011-04-06 淄博天润气体有限公司 Flowmeter pressure transmitting device
CN203719706U (en) * 2014-01-26 2014-07-16 上海华林工业气体有限公司 Differential pressure flow measurement device capable of improving LPG (liquefied petroleum gas) flow measurement accuracy

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6286367B1 (en) * 1998-03-30 2001-09-11 Schlumberger Technology Corporation Method of evaluating the effluent of a hydrocarbon well by means of a multiphase flowmeter, and installation implementing the same
CN2594770Y (en) * 2002-11-13 2003-12-24 卢玖庆 Throttling differential pressure flowmeter
CN201787982U (en) * 2010-07-24 2011-04-06 淄博天润气体有限公司 Flowmeter pressure transmitting device
CN203719706U (en) * 2014-01-26 2014-07-16 上海华林工业气体有限公司 Differential pressure flow measurement device capable of improving LPG (liquefied petroleum gas) flow measurement accuracy

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111766091A (en) * 2020-07-07 2020-10-13 西安航天动力试验技术研究所 Calibration system and method of low-frequency pulsation suppression device for ground test
CN111766091B (en) * 2020-07-07 2022-03-11 西安航天动力试验技术研究所 Calibration system and method of low-frequency pulsation suppression device for ground test

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Granted publication date: 20180612

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