CN104236684A - Fluid reversing device and guide-in and guide-out time difference compensation method thereof - Google Patents
Fluid reversing device and guide-in and guide-out time difference compensation method thereof Download PDFInfo
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- CN104236684A CN104236684A CN201410549017.2A CN201410549017A CN104236684A CN 104236684 A CN104236684 A CN 104236684A CN 201410549017 A CN201410549017 A CN 201410549017A CN 104236684 A CN104236684 A CN 104236684A
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- state
- commutator
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- reversing device
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Abstract
The invention discloses a fluid reversing device and a guide-in and guide-out time difference compensation method of the fluid reversing device. The method comprises the steps that the reversing device is in the to-be-switched state ClArBl of a non-work mode and enters in a work mode, Ar and Bl are not changed, and Cl is changed into Cr, namely, the state CrArBl; the reversing device is in the work mode, the state CrArBl is converted into the state CrAlBl, the state CrAlBl is converted into the state ClAlBl, the state ClAlBl is converted into the state ClAlBr, and ClAlBr is the to-be-switched state of the work mode; the reversing device is in the to-be-switched state ClAlBr of the work mode and enters in the non-work mode, Al and Br are not changed, and Cl is changed into Cr, namely, the state CrArBr; a water pump stops working, the reversing device is in the non-work mode, the state CrAlBr is converted into the state CrArBr, the state CrArBr is converted into the state ClArBr, the state ClArBr is converted into the state ClArBl, and ClArBl is the to-be-switched state of the non-work mode. According to the method, swap-out and swap-in of the reversing device have the same stroke, the swap-out and swap-in time difference of the reversing device caused by different strokes is eliminated, and the flowmeter verification precision is improved.
Description
Technical field
The present invention relates to flowmeter testing calibration field, particularly relate to a kind of fluid reversing device and derive the compensation method of importing time difference.
Background technology
Metering is industrial eyes.Flow metering, as measuring science technology important component part, has close relationship with national economy, national defense construction, scientific research.Carry out this work; to ensureing product quality, enhance productivity, the development of the technology that advances science all has important effect; particularly in energy crisis, current era that industrial production automation degree is more and more high, the role and effect of flowmeter in national economy is more obvious.
Commutator, as the important composition parts of Static mass method, Static Volumetric Method flow apparatus, is widely used in the metering of discharge, oily flow and heat energy meter flow apparatus.Its principle of work utilizes mechanical part to change liquid flow direction, and its effect ensures that liquid continuous flow crosses measured stream gauge, the Measuring Time of accurate-metering flowmeter.
Fig. 1, for the reversing arrangement figure based on common commutator, when reversing arrangement enters duty from off working state, valve 104 is closed, thrust unit 101 promotes commutator 102 from right (right) (left) left, and water enters container 103 via reversing arrangement; When its tangential off working state, commutator will from left (left) to the right (right), and water enters return pipe 104 via reversing arrangement; When the work has been finished, valve 105 is opened.
The separatrix time crossed from right to left by note commutator is t
r → l, crossing the marginal time to the right from left swing is t
l → r, mass rate q
mmore constant, so reversing arrangement is switched to the flow error Δ Q of mode of operation from non-operating mode
1for:
ΔQ
1＝-q
m·t
r→l (1)
Reversing arrangement is switched to the flow error Δ Q of non-operating mode from mode of operation
2for:
ΔQ
2＝q
m·t
l→r (2)
Therefore the flow error Δ Q brought commutating period due to reversing arrangement is:
ΔQ＝ΔQ
1+ΔQ
2＝q
m·t
l→r-q
m·t
r→l＝q
m(t
l→r-t
r→l)＝q
m·Δt (3)
Δ t=t in above formula
l → r-t
r → lthe commutating period inconsistent for the positive and negative journey time of reversing arrangement is poor.
Above formula shows, for q
m=Const, | in the situation of Δ t| → 0, Δ Q → 0, i.e. reversing arrangement t
r → l, t
l → rmore close, Q is less for flow error Δ.
Relevant research shows, because commutator commutation swing has larger mechanical trip, twice commutating period differs from Δ t magnitude and reach hundreds of ms, therefore will improve flow measurement precision, must overcome the error effect that mistiming Δ t causes.The error that reversing arrangement based on common commutator brings because positive and negative journey time is inconsistent when commutating is comparatively large, is the main error source of whole flow measurement device, therefore it may be necessary improvement reversing arrangement structure, the impact brought when reducing commutation to greatest extent.
Summary of the invention
For solving the problems of the technologies described above, the object of this invention is to provide a kind of fluid reversing device and the compensation method of this device derivation importing time difference, unidirectional working method under described apparatus and method realization replacing mode of operation, due to the inconsistent impact brought two-way time of commutator machinery when overcoming commutation dexterously, convert thereof into reversing arrangement one-way trip repeatability problem, improve flow measurement precision.
Object of the present invention is realized by following technical scheme:
The method realizes, if the state that commutator is in the left side and the right is designated as C respectively based on measuring device, commutator and at least two transverters
l, C
r, a transverter is in the state A respectively on the left side and the right
l, A
r, the state that another circulator is in the left side and the right is designated as B respectively
l, B
r; Its method comprises:
A reversing arrangement is in the to be switched state C of non-operating mode
la
rb
l, enter mode of operation, A
r, B
lconstant, C
lbecome C
r, i.e. state C
ra
rb
l;
B reversing arrangement is in mode of operation, from state C
ra
rb
lbe transformed into state C
ra
lb
l, state C
ra
lb
lbe transformed into state C
la
lb
l, state C
la
lb
lbe transformed into state C
la
lb
r, C
la
lb
rit is the to be switched state of mode of operation;
C reversing arrangement is in the to be switched state C of mode of operation
la
lb
r, enter non-operating mode A
l, B
rconstant, C
lbecome C
r, i.e. state C
ra
lb
r;
D water pump quits work, and reversing arrangement is in non-operating mode, from state C
ra
lb
rforward state C to
ra
rb
r, state C
ra
rb
rforward state C to
la
rb
r, state C
la
rb
rforward state C to
la
rb
l, C
la
rb
lit is the to be switched state of non-operating mode.
Compared with prior art, one or more embodiment of the present invention can have the following advantages by tool:
Realize commutator to swap out and change to there is identical stroke, eliminate the mistiming that the commutator that caused by stroke difference swaps out and changes to, improve the precision of meter proof.
Accompanying drawing explanation
Fig. 1 is the reversing arrangement structural representation of prior art based on common fluid commutator;
Fig. 2 is fluid reversing device structural representation provided by the invention;
Fig. 3 ensures that fluid reversing device has the method flow diagram of identical positive and negative commutating period.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail.
As shown in Figure 2, be the fluid reversing device schematic diagram of identical positive and negative commutating period.For proposition existing problems, apparatus structure is improved, with the addition of transverter A201, transverter B202, Δ t can be overcome affect, if commutator, left and right transverter are respectively C, A, B, commutator C is in the left side (left), be in the state on the right (right) is designated as C respectively
l, C
r, transverter A is in the left side (left), the state of the right (right) is designated as A respectively
l, A
r, transverter B is in the left side (left), the state of the right (right) is designated as B respectively
l, B
r.
See Fig. 3, for ensureing that fluid reversing device has the method flow of identical positive and negative commutating period, from flow chart analysis:
1. due to transverter A (or B) change state time, commutator C always connects to transverter B (or A), and its state all remains unchanged, so time mode of operation do not change, make the positive revesal inconsistency of transverter A (or B) bring flow error to whole reversing arrangement;
2. because commutator C state is from C
rto C
ltime, transverter A, B are in same state, so time its mode of operation constant, be in continuous duty;
3., when mode of operation changed by reversing arrangement, commutator C state is all from C
lto C
rnamely from left to right, the unidirectional replacing mode of operation of commutator is realized.
If device is in be switched state, so:
1. A during Dietary behavior
r, B
lconstant, C
lbecome C
r, i.e. state C
ra
rb
lif commutator C enters mode of operation, and (namely first time is from state C
lcross separatrix and arrive state C
r) time be t
l → r', mass rate
qmmore constant, then reversing arrangement is switched to the flow error Δ Q of mode of operation from non-operating mode
1' be:
ΔQ
1'＝-q
m·t
l→r′ (4)
From state C
ra
rb
lto state C
ra
lb
l, state C
ra
lb
lto state C
la
lb
l, state C
la
lb
lto state C
la
lb
r, reversing arrangement does not all bring because commutation zone carrys out flow error, C
la
lb
rit is again to be switched state.
2. by be switched state C
la
lb
r, enter non-operating mode, A
l, B
rconstant, C
lbecome C
r, i.e. state C
ra
lb
rif commutator C enters non-operating mode, and (namely second time is from state C
lcross separatrix and arrive state C
r) time be t
l → r", mass rate q
mmore constant, then reversing arrangement is switched to the flow error Δ Q' of non-operating mode from mode of operation
2for:
ΔQ'
2＝q
m·t
l→r″ (5)
In like manner, from state C
ra
lb
rto state C
ra
rb
r, state C
ra
rb
rto state C
la
rb
r, state C
la
rb
rto state C
la
rb
l, reversing arrangement all less than due to the flow error that brings of commutating, C
la
rb
lit is again to be switched state.
Therefore, in a complete working period, the flow error Δ Q ' brought by reversing arrangement is:
ΔQ′＝ΔQ
1'+ΔQ'
2＝q
m·t
l→r″-q
m·t
l→r′＝q
m(t
l→r″-t
l→r′)＝q
m·Δt′ (6)
Δ t '=t in above formula
l → r"-t
l → r' for the commutating period of reversing arrangement twice identical single direction stroke poor.
Due to Δ t ' << Δ t, then flow error Δ Q ' << Δ Q.If t
l → r"=t
l → r',
namely flow error during reversing arrangement commutation is zero.
If water flow field changes, or thrust unit is unstable, all can cause weakening to the repeatability of commutator, now can cause t
l → r' with t
l → r" do not repeat; but Δ t ' repeatability (a few ms of magnitude) is compared original Δ t (magnitude hundreds of ms) and had remarkable attenuating; this device eliminates that commutator is derived effectively, the importing time on the impact of flow measurement, greatly improve flow measurement precision.
Although the embodiment disclosed by the present invention is as above, the embodiment that described content just adopts for the ease of understanding the present invention, and be not used to limit the present invention.Technician in any the technical field of the invention; under the prerequisite not departing from the spirit and scope disclosed by the present invention; any amendment and change can be done what implement in form and in details; but scope of patent protection of the present invention, the scope that still must define with appending claims is as the criterion.
Claims (6)
1. fluid reversing device is derived and is imported time difference compensation method, it is characterized in that, the method realizes, if the state that commutator is in the left side and the right is designated as C respectively based on measuring device, commutator and at least two transverters
l, C
r, a transverter is in the state A respectively on the left side and the right
l, A
r, the state that another circulator is in the left side and the right is designated as B respectively
l, B
r; Its method comprises:
A reversing arrangement is in the to be switched state C of non-operating mode
la
rb
l, enter mode of operation, A
r, B
lconstant, C
lbecome C
r, i.e. state C
ra
rb
l;
B reversing arrangement is in mode of operation, from state C
ra
rb
lbe transformed into state C
ra
lb
l, state C
ra
lb
lbe transformed into state C
la
lb
l, state C
la
lb
lbe transformed into state C
la
lb
r, C
la
lb
rit is the to be switched state of mode of operation;
C reversing arrangement is in the to be switched state C of mode of operation
la
lb
r, enter non-operating mode A
l, B
rconstant, C
lbecome C
r, i.e. state C
ra
lb
r;
D water pump quits work, and reversing arrangement is in non-operating mode, from state C
ra
lb
rforward state C to
ra
rb
r, state C
ra
rb
rforward state C to
la
rb
r, state C
la
rb
rforward state C to
la
rb
l, C
la
rb
lit is the to be switched state of non-operating mode.
2. fluid reversing device according to claim 1 is derived and is imported time difference compensation method, it is characterized in that, in described steps A, if commutator enters mode of operation i.e. first time from state C
lcross separatrix and arrive state C
rtime be t
l → r', mass rate q
mmore constant, then reversing arrangement is switched to the flow error Δ Q of mode of operation from non-operating mode
1' be Δ Q
1'=-q
mt
l → r'.
3. fluid reversing device according to claim 1 is derived and is imported time difference compensation method, it is characterized in that, in described step B, when described transverter changes state, commutator always connects to different transverters, and state remains unchanged, now water flows into measuring device, makes transverter positive revesal inconsistency bring flow error to whole reversing arrangement; Commutator state is from C
rto C
ltime, described transverter is in same state, and now water flows into measuring device, is in continuous duty, makes commutator state from C
rto C
ltime, flow error can not be brought to whole reversing arrangement.
4. fluid reversing device according to claim 1 is derived and is imported time difference compensation method, and it is characterized in that, in described step C, commutator C enters non-operating mode, and namely second time is from state C
lcross separatrix and arrive state C
rtime be t
l → r", mass rate q
mconstant, then reversing arrangement is switched to the flow error Δ Q' of non-operating mode from mode of operation
2for: Δ Q'
2=q
mt
l → r".
5. the fluid reversing device according to claim 2 or 4 is derived and is imported time difference compensation method, it is characterized in that, described fluid reversing device pattern switching error, in a complete working period, the flow error Δ Q ' brought commutating period due to reversing arrangement is:
ΔQ′＝ΔQ′
1+ΔQ′
2＝q
m·t
l→r″-q
m·t
l→r′＝q
m(t
l→r″-t
l→r′)＝q
m·Δt′。
6. fluid reversing device according to claim 1, is characterized in that,
Described commutator is connected with described transverter;
Described transverter is connected to measuring device and return pipe;
Described commutator is connected with thrust unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410549017.2A CN104236684B (en) | 2014-10-16 | 2014-10-16 | Fluid reversing device and guide-in and guide-out time difference compensation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410549017.2A CN104236684B (en) | 2014-10-16 | 2014-10-16 | Fluid reversing device and guide-in and guide-out time difference compensation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104236684A true CN104236684A (en) | 2014-12-24 |
| CN104236684B CN104236684B (en) | 2017-05-17 |
Family
ID=52225213
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410549017.2A Active CN104236684B (en) | 2014-10-16 | 2014-10-16 | Fluid reversing device and guide-in and guide-out time difference compensation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105509844A (en) * | 2015-11-23 | 2016-04-20 | 华南理工大学 | Open type commutator calibration method for general liquid flow calibrating apparatus |
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|---|---|---|---|---|
| CN201060035Y (en) * | 2007-07-10 | 2008-05-14 | 兰州市供水（集团）有限公司 | Commutalor with adjustable stroke speed and time difference |
| WO2010121650A1 (en) * | 2009-04-21 | 2010-10-28 | Aquametro Ag | Method and device for calibrating liquid meters |
| CN102359807A (en) * | 2011-08-08 | 2012-02-22 | 天津大学 | Control scheme for flow stability of liquid flow device |
| CN202748108U (en) * | 2012-09-07 | 2013-02-20 | 丹东科泰仪器仪表有限公司 | Liquid reversing device of flow measurement standard system |
| CN203745051U (en) * | 2014-03-25 | 2014-07-30 | 重庆市计量质量检测研究院 | Two-position one-way reversing valve type pVTt-method gas flow device |
-
2014
- 2014-10-16 CN CN201410549017.2A patent/CN104236684B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201060035Y (en) * | 2007-07-10 | 2008-05-14 | 兰州市供水（集团）有限公司 | Commutalor with adjustable stroke speed and time difference |
| WO2010121650A1 (en) * | 2009-04-21 | 2010-10-28 | Aquametro Ag | Method and device for calibrating liquid meters |
| CN102359807A (en) * | 2011-08-08 | 2012-02-22 | 天津大学 | Control scheme for flow stability of liquid flow device |
| CN202748108U (en) * | 2012-09-07 | 2013-02-20 | 丹东科泰仪器仪表有限公司 | Liquid reversing device of flow measurement standard system |
| CN203745051U (en) * | 2014-03-25 | 2014-07-30 | 重庆市计量质量检测研究院 | Two-position one-way reversing valve type pVTt-method gas flow device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105509844A (en) * | 2015-11-23 | 2016-04-20 | 华南理工大学 | Open type commutator calibration method for general liquid flow calibrating apparatus |
| CN105509844B (en) * | 2015-11-23 | 2018-09-28 | 华南理工大学 | A kind of universal liquid flowrate calibrating device open commutator calibration method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104236684B (en) | 2017-05-17 |
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