CN2735309Y - Capacitor target type flowmeter - Google Patents
Capacitor target type flowmeter Download PDFInfo
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- CN2735309Y CN2735309Y CN 200420094299 CN200420094299U CN2735309Y CN 2735309 Y CN2735309 Y CN 2735309Y CN 200420094299 CN200420094299 CN 200420094299 CN 200420094299 U CN200420094299 U CN 200420094299U CN 2735309 Y CN2735309 Y CN 2735309Y
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- elastic tube
- target type
- electric capacity
- type meter
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Abstract
The utility model relates to a capacitor target type flowmeter for solving the problem that the accuracy and long-term stability of the existing target-type flowmeter is not ideal enough. The capacitor target type flowmeter of the utility model comprises a measuring tube. A target, a target rod and a force sensor which are orderly connected with each other are arranged in the measuring tube. The utility model also comprises a converting circuit connected with the force sensor, wherein, the force sensor is the force sensor of capacitance and comprises an elastic tube whose first end is fixed and second end is connected with the target rod, a fixed electrode which is arranged in the elastic tube and is fixed and a movable electrode which is fixed in the elastic tube and can oscillate following the elastic tube. The fixed electrode and the movable electrode mutually face and are respectively connected with the converting circuit via conducting wires. The movable electrode can follow the elastic tube to oscillate, and thus, the capacitance between the fixed electrode and the movable electrode is altered, and further the corresponding sizes of the flow rate is transmitted. The flowmeter of the utility model not only has the feature of fixed components, but also has favorable accuracy of measurement and long-term stability.
Description
Technical field
The utility model relates to the flowmeter that is used to measure the liquids and gases flow, more particularly, relates to a kind of electric capacity target type meter.
Background technology
In the prior art, multiple different principle is arranged, the flowmeter of different structure, in the patent No. is in the utility model patent " novel target type meter " of ZL99201800.5, disclose a kind of strain target type flowmeter, the force transducer that adopts in this class flowmeter is the strain gage force transducer, though its precision and stability are with respect to the existing bigger submission of traditional flowmeter, but its precision is still lower, has only 0.1%-1.0%, and the time float reach 1%/year-10%/year, so long-time stability are also relatively poor, this class sensor non-refractory, and technological level in addition requires high.
The utility model content
At the above-mentioned defective of prior art, the still dissatisfactory problem of the degree of accuracy of existing target type meter to be solved in the utility model and long-time stability.
For solving the problems of the technologies described above, the technical solution of the utility model is: construct a kind of electric capacity target type meter, comprise a measuring tube, the target plate, target bar and the force transducer that connect successively are housed in described measuring tube; Also comprise the change-over circuit that is connected with described force transducer, wherein, described force transducer is a capacitive force sensor.
In the utility model, comprise in the described capacitive force sensor: the elastic tube that first end maintains static and second end is connected with described target bar, be contained in the described elastic tube and fixed fixed electrode, and, be contained in the described elastic tube and can be with the moving electrode of described elastic tube elastic displacement; Described fixed electrode and moving electrode are faced mutually, and are connected with described change-over circuit by corresponding lead respectively; Described moving electrode can be swung with described elastic tube, thereby changes the electric capacity between fixed electrode and the moving electrode, and then changes out corresponding flow size.
In a preferred version of the present utility model, be provided with a cavity in the junction of described elastic tube and target bar; One end of described fixed electrode is contained in first end of described elastic tube, and the other end reaches in the described cavity; At the sidewall of described cavity the insulating material that at least one and described fixed electrode are faced is housed, described moving electrode is contained on the described insulating material.At this moment, the cross sectional shape of described elastic tube can be rectangle, circle or oblateness.
In another preferred version of the present utility model, in described elastic tube, be provided with the fixed insulating material that stretches out to second end by its first end, described fixed electrode is contained on the described insulating material, and described moving electrode is contained in the inwall of described elastic tube.At this moment, the cross sectional shape of described elastic tube and insulating material external part is preferably identical, specifically can be rectangle, circle or oblateness.
In the utility model, comprise capacitance-voltage change-over circuit that is connected with described capacitive force sensor and the a/D converter circuit that is connected with described capacitance-voltage change-over circuit in the described change-over circuit.Also comprise the processes and displays circuit that is connected with described change-over circuit in the described electric capacity target type meter; Comprise microprocessor, display and output interface in the described processes and displays circuit; The input end of described microprocessor is connected with described a/D converter circuit, and described display is connected with the corresponding output end of described microprocessor with output interface.
Flowmeter of the present utility model is to adopt novel capacitor force transducer and modern digital technological development to form brand-new type flowmeter, it had both had the characteristics that flowmeters such as conventional target formula, orifice plate, vortex street do not have movable member, has simultaneously the accuracy of measurement that compares favourably with volumeter again, its distinctive anti-interference, anti-impurity performance in addition, light characteristics such as reliable again can be widely used in the flow measurement of every field such as metallurgy, oil, chemical industry, the energy, food environmental protection.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is an electric capacity target type meter structural principle synoptic diagram of the present utility model;
Fig. 2 is the sectional structure chart of capacitive force sensor in preferred embodiment of the utility model;
Fig. 3 is the sectional structure chart of capacitive force sensor in another preferred embodiment of the utility model;
Fig. 4, Fig. 5, Fig. 6 are three kinds of A-A cross section structure synoptic diagram of elastic tube shown in Fig. 2.
Embodiment
The structural principle of the utility model electric capacity target type meter as shown in Figure 1, as can be seen from the figure, this flowmeter is by measuring tube 104, the target plate 103, target bar 102 and the capacitive force sensor 101 that are contained in the measuring tube and connect successively, the change-over circuit that is connected with force transducer, and the processes and displays circuit that is connected with change-over circuit is formed.Shown in the frame of broken lines among the figure, comprise capacitance-voltage change-over circuit 106 and a/D converter circuit 107 in the change-over circuit; Comprise microprocessor 105, display 108 and a plurality of output interface in the processes and displays circuit, comprise pulse output interface 109,4-20mA output interface 110, RS232 and RS485 communication interface 111.
When medium flows in measuring tube 104, can produce a directed force F to target plate 103, square being directly proportional of its size and velocity of medium, mathematic(al) representation is as follows:
F＝C
DAP*U
2/2 (1)
Wherein, F is the acting force that target plate is subjected to, C
DBe the object resistance coefficient, A is the axial projective area of target plate to measuring tube, and P is the Media density under the current working.
After target plate 103 is stressed, through and the rigidly connected target bar of capacitive force sensor, the capacitance of capacitive force sensor is changed, its formula as shown in the formula:
ΔC＝KF (2)
Wherein, K is a proportionality constant, and Δ C is the capacitance variation amount of capacitive force sensor, and this capacitance change can obtain corresponding flow size after capacitance-voltage conversion, analog-to-digital conversion and computing.
What be illustrated in figure 2 as capacitive force sensor in preferred embodiment of the utility model analyses and observe the knot synoptic diagram, as can be seen from the figure, maintain static and elastic tube 201 that second end is connected with the target bar comprising: first end, be contained in the elastic tube and fixed fixed electrode 202, and, be contained in the elastic tube and can be with the moving electrode 203 of elastic tube swing; Wherein, fixed electrode and moving electrode are faced mutually, and are connected with aforementioned change-over circuit by corresponding lead respectively.
As can be seen from Figure 2, be provided with a cavity 206 in the junction of elastic tube 201 and target bar 102; One end of fixed electrode 202 is contained in the upper end (first end) of elastic tube, and the other end reaches in the cavity 206; At the left and right sides of cavity sidewall an insulating material 205 of facing with fixed electrode 202 is housed respectively, moving electrode 203 just is contained on the insulating material 205.
As can be seen, the cross sectional shape of elastic tube 201 can be rectangle, circle or oblateness from Fig. 4, Fig. 5 and Fig. 6, that is to say, elastic tube 201 can be rectangular tube, round tube or oblate pipe, certainly, can also be other suitable shapes.
When MEDIA FLOW was crossed measuring tube 104, target plate 103 can be subjected to the acting force of direction shown in the arrow, swung to the right thereby can drive target bar 102; Because elastic tube 201 is that resilient material is made, so its lower end can be swung to the right with the target bar, and then two moving electrodes are swung to the right about driving, and the capacitance between this moment fixed electrode and the moving electrode can change; Then, by capacitance-voltage change-over circuit 106 capacitance variations is converted to change in voltage, be converted into digital signal by a/D converter circuit 107 again and be input to microprocessor 105, microprocessor carries out can obtaining corresponding instantaneous delivery and integrated flow after the corresponding calculated processing.Capacitance-voltage change-over circuit wherein, a/D converter circuit and corresponding processes and displays circuit all have ripe prior art, repeat no more herein.
What be illustrated in figure 3 as capacitive force sensor in another preferred embodiment of the utility model analyses and observe the knot synoptic diagram, as can be seen from the figure, wherein also comprises elastic tube 301, fixed electrode 302, moving electrode 303, target bar 102 and insulating material 305.But in the present embodiment, insulating material 305 is stretched out to second end (lower end) by first end in elastic tube 301, and is fixed, and fixed electrode 302 just is contained on the insulating material, and moving electrode 303 then is contained in the inwall of elastic tube.In the present embodiment, elastic tube is identical with the cross sectional shape of insulating material external part, specifically can be the rectangle shown in Fig. 4, Fig. 5 and Fig. 6, circle or oblateness, can also be other suitable shapes certainly.
As a same reason, when MEDIA FLOW is crossed measuring tube 104, target bar 102 can drive elastic tube 201 right swings, and then the moving electrode that drives on its inwall is swung to the right, capacitance between fixed electrode and the moving electrode can change at this moment, after conversion and computing, can obtain corresponding instantaneous delivery and integrated flow.
Owing to taked said structure, capacitor target type flowmeter of the present utility model has the following advantages:
● be applicable to various calibers, from Φ 15-Φ 1500mm, in addition bigger;
● be applicable to high and low temperature medium, from-40 ℃-+400 ℃;
● be applicable to the high pressure operating mode, from 0-42Mpa (gauge pressure);
● the various gas such as the liquid under the various normal temperature of energy Measurement accuracy, high temperature, the worst cold case, viscous medium The flow of body medium;
● highly sensitive, can measure extra small flow, it can measure low flow velocity is 0.08m/s;
● no movable member, safe and reliable;
● measurement category is wide, and maximum measurement category can reach 1: 20;
● good reproducibility, be generally 0.05-0.08%, measure fast;
● the pressure loss is little, only is 1/2 Δ P of standard orifice plate;
● anti-interference, anti-impurity ability is strong;
● can be online directly reads, also can long-range transmission measurement result;
● install simple and conveniently, safeguard easily.
Claims (9)
1, a kind of electric capacity target type meter comprises a measuring tube, and the target plate, target bar and the force transducer that connect successively are housed in described measuring tube; Also comprise the change-over circuit that is connected with described force transducer, it is characterized in that described force transducer is a capacitive force sensor.
2, electric capacity target type meter according to claim 1 is characterized in that, comprises in the capacitive force sensor:
The elastic tube that first end maintains static, second end is connected with described target bar,
Be contained in the described elastic tube and fixed fixed electrode,
And, be contained in the described elastic tube and can be with the moving electrode of described elastic tube elastic displacement;
Described fixed electrode and moving electrode are faced mutually, and are connected with described change-over circuit by corresponding lead respectively.
3, electric capacity target type meter according to claim 2 is characterized in that, is provided with a cavity in the junction of described elastic tube and target bar; One end of described fixed electrode is contained in first end of described elastic tube, and the other end reaches in the described cavity; At the sidewall of described cavity the insulating material that at least one and described fixed electrode are faced is housed, described moving electrode is contained on the described insulating material.
4, electric capacity target type meter according to claim 3 is characterized in that, the cross sectional shape of described elastic tube can be rectangle, circle or oblateness.
5, electric capacity target type meter according to claim 2, it is characterized in that, be provided with the fixed insulating material that is stretched out to second end by its first end in described elastic tube, described fixed electrode is contained on the described insulating material, and described moving electrode is contained in the inwall of described elastic tube.
6, electric capacity target type meter according to claim 5 is characterized in that, described elastic tube is identical with the cross sectional shape of insulating material external part, can be rectangle, circle or oblateness.
7, according to each described electric capacity target type meter among the claim 1-6, it is characterized in that, comprise capacitance-voltage change-over circuit that is connected with described capacitive force sensor and the a/D converter circuit that is connected with described capacitance-voltage change-over circuit in the described change-over circuit.
8, electric capacity target type meter according to claim 7 is characterized in that, wherein also comprises the processes and displays circuit that is connected with described change-over circuit; Comprise microprocessor, display and output interface in the described processes and displays circuit; The input end of described microprocessor is connected with described a/D converter circuit, and described display is connected with the corresponding output end of described microprocessor with output interface.
9, electric capacity target type meter according to claim 8 is characterized in that, described output interface can be pulse output interface, 4-20mA output interface, RS232 output interface, RS485 output interface this in several any or appoint a plurality of.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420094299 CN2735309Y (en) | 2004-10-26 | 2004-10-26 | Capacitor target type flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420094299 CN2735309Y (en) | 2004-10-26 | 2004-10-26 | Capacitor target type flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2735309Y true CN2735309Y (en) | 2005-10-19 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420094299 Expired - Fee Related CN2735309Y (en) | 2004-10-26 | 2004-10-26 | Capacitor target type flowmeter |
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| Country | Link |
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| CN (1) | CN2735309Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101907499A (en) * | 2010-06-22 | 2010-12-08 | 青岛海威茨仪表有限公司 | Calorimeter sensor of momentum type |
| CN101692004B (en) * | 2009-07-23 | 2012-08-01 | 李海旋 | Novel differential force (capacitance) type flow transducer, processing technique and application thereof |
| CN107101686A (en) * | 2017-06-30 | 2017-08-29 | 荆州市明德科技有限公司 | Thermal production well steam mass flow measurement target-type flow sensor and target type meter |
| US9970793B2 (en) | 2013-12-17 | 2018-05-15 | Shanghai Universoon Autoparts Co., Ltd. | Self-rotating flowmeter having a rotating mechanism including a hollow shaft and a disk having internal flow passages |
-
2004
- 2004-10-26 CN CN 200420094299 patent/CN2735309Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101692004B (en) * | 2009-07-23 | 2012-08-01 | 李海旋 | Novel differential force (capacitance) type flow transducer, processing technique and application thereof |
| CN101907499A (en) * | 2010-06-22 | 2010-12-08 | 青岛海威茨仪表有限公司 | Calorimeter sensor of momentum type |
| US9970793B2 (en) | 2013-12-17 | 2018-05-15 | Shanghai Universoon Autoparts Co., Ltd. | Self-rotating flowmeter having a rotating mechanism including a hollow shaft and a disk having internal flow passages |
| CN107101686A (en) * | 2017-06-30 | 2017-08-29 | 荆州市明德科技有限公司 | Thermal production well steam mass flow measurement target-type flow sensor and target type meter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20051019 Termination date: 20091126 |