CN104215280A - Strain target flowmeter capable of restraining temperature drift - Google Patents
Strain target flowmeter capable of restraining temperature drift Download PDFInfo
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- CN104215280A CN104215280A CN201410521335.8A CN201410521335A CN104215280A CN 104215280 A CN104215280 A CN 104215280A CN 201410521335 A CN201410521335 A CN 201410521335A CN 104215280 A CN104215280 A CN 104215280A
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- cylindrical shell
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- insulation barriers
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Abstract
The invention discloses a strain target flowmeter capable of restraining temperature drift; as a thermal insulating piece which does not influence angular displacement of a target rod is used for separating a lower-part barrel from an upper-part elastomer; thermal resistance of a heat transferring path, from the lower-part barrel to the upper-part elastomer, of an indoor high-temperature measured fluid is greatly improved, so that temperature of the elastomer is closer to environmental temperature of surrounding air, influence of temperature fluctuation of the high-temperature measured fluid on the elastomer adhered with a strain gauge is greatly reduced, and thereby temperature drift restraining capacity of the strain target flowmeter is improved, and measuring errors can be greatly reduced; the strain target flowmeter capable of restraining temperature drift is simple in structure, can achieve the purpose of effectively restraining temperature drift of the strain target flowmeter by only adding the thermal insulating piece without changing the basic structure of the original strain target flowmeter, and can be made into a plug-and-play type instrument after being added with the thermal insulating piece, thus being convenient to fill balancing liquid, and good in application prospect.
Description
Technical field
The present invention relates to a kind of instrument that realizes flow detection in Automatic Measurement Technique field, particularly relate to Strain Target Flowmeter.
Background technology
When measuring high viscosity, low reynolds number fluid flow, user is choice for use target type meter often.But use maximum Strain Target Flowmeter to have two major defects, the one, foil gauge is directly attached on elastic body, and the impact that is easily subject to detected fluid temperature variation produces temperature drift; The 2nd, the anti-overload ability of Strain Target Flowmeter is poor.About the poor solution of anti-overload ability (non-spacing method), will in another patented claim, provide, present patent application only provides the scheme that solves temperature drift.If foil gauge is attached on elastic body and forms strain bridge, if elastic body is not subject to external force, but its environment temperature changes, and the output of strain bridge also will change thereupon.Now, the variation of strain bridge output is not because elastic body is stressed, to have produced strain, but causes because its environment temperature changes, and therefore it is called to temperature drift (or calling thermal output).For the elastic body of most metals material, when its environment temperature changes 100 ℃, the temperature drift of strain bridge has just reached the order of magnitude same with tested strain facies, and obviously so large measuring error is unacceptable.Therefore, the strain bridge of practical application all will adopt various temperature compensations, and conventional temperature compensation has Bridge circuit compensation method and self-compensating method.Adopt the strain bridge after temperature compensation, for the common little variation of ambient temperature of variation range, the temperature drift of strain bridge can be within tolerance scope.But when detected fluid temperature is very high, because fluid temperature (F.T.) fluctuation range may be very large, by various heat transfer paths, be delivered to elastomeric heat very large, elastomeric temperature variation is also very large, and this just makes to adopt the temperature drift of the strain bridge after temperature compensation still can exceed tolerance scope.By above-mentioned, can find, as long as improve detected fluid to the thermal resistance of each heat-transfer path between elastic body, make the fluctuating range of detected fluid temperature have larger decay at elastic body place, just can make within the temperature drift of strain bridge is controlled at tolerance scope.
Summary of the invention
Because said temperature drifting problem can the mode to the thermal resistance of heat-transfer path between elastic body solve by raising detected fluid, therefore, normal work does not have under influential prerequisite to Strain Target Flowmeter, developed a kind of Strain Target Flowmeter of resisting temperature drift.
The present invention is that the technical scheme that adopts of its technical requirement of solution is as follows: as shown in Figure of description, the flow of development is counted a kind of Strain Target Flowmeter that suppresses temperature drift, by measuring chamber and bottom, be communicated with measuring chamber and the cylindrical shell two large divisions of top seal forms, the vitals in two large divisions comprises target in measuring chamber, the target bar in cylinder lumen, as the elastic body of the upper end sealing on cylindrical shell top and be attached to the foil gauge on elastic body.Use the thermal insulation barriers that does not affect the angular displacement of target bar that the elastic body on cylindrical shell bottom and top is divided into two mutual disconnected spaces, bottom cylindrical shell casing and elastic body junction should install heat insulating washer additional, this heat insulating washer also can be replaced by the extension of thermal insulation barriers lower end, and thermal insulation barriers has following several composition form.The first thermal insulation barriers by one section of corrugated tube and thereon, lower two ends respectively connect a circle ring disk and form, upper end circle ring disk outer rim is connected with sylphon seal, inner edge is connected with target rod seal, lower end circle ring disk inner edge is connected with sylphon seal, outer rim and cylindrical shell are tightly connected, corrugated tube and two circle ring disks are made by heat-barrier material, and wherein at least corrugated tube is made by elasticity heat-barrier material.The second thermal insulation barriers by one section of pipe and thereon, lower two ends respectively connect a circle ring disk and form, upper end circle ring disk outer rim and pipe are tightly connected, inner edge is connected with target rod seal, lower end circle ring disk inner edge and pipe are tightly connected, outer rim and cylindrical shell are tightly connected, pipe and two circle ring disks are made by heat-barrier material, and wherein at least pipe is made by elasticity heat-barrier material.The third thermal insulation barriers adapted a separator, thermal insulation barriers is arranged between separator and elastic body, separator by one section of corrugated tube and thereon, lower two ends respectively connect a circle ring disk and form, upper end circle ring disk outer rim is connected with sylphon seal, inner edge is connected with target rod seal, lower end circle ring disk inner edge is connected with sylphon seal, outer rim and cylindrical shell are tightly connected, corrugated tube and two circle ring disks are made by metal material, thermal insulation barriers by one section of pipe and thereon, lower two ends respectively connect a circle ring disk and form, upper end circle ring disk outer rim and pipe are tightly connected, inner edge is connected with target rod seal, lower end circle ring disk inner edge and pipe are tightly connected, outer rim and cylindrical shell are tightly connected, pipe and two circle ring disks are made by heat-barrier material, wherein at least pipe is made by elasticity heat-barrier material.In first and second kind of heat insulation device, in the space that thermal insulation barriers and elastic body surround, be filled with equilibrium liquid, in the third heat insulation device, when detected fluid working pressure is higher, in the space that thermal insulation barriers and elastic body surround, be filled with equilibrium liquid, in the space that separator and thermal insulation barriers surround, be also filled with equilibrium liquid.In addition, target bar should wrap up heat-barrier material, connects bottom cylindrical shell and elastomeric bolt and answers overcoat thermal sleeve and install heat insulating mattress additional.
The invention has the beneficial effects as follows, owing to using thermal insulation barriers, bottom cylindrical shell and top elastic body are separated, in measuring chamber, by bottom cylindrical shell, the thermal resistance to elastomeric heat-transfer path significantly improves high temperature detected fluid, make elastomeric temperature closer to the environment temperature of surrounding air, the temperature fluctuation of high temperature detected fluid is significantly decayed on elastomeric impact, thereby the ability that has improved Strain Target Flowmeter inhibition temperature drift, can significantly reduce this measuring error.From the above, the present invention is simple in structure, and in the situation that not changing former Strain Target Flowmeter basic structure, additional insulation part just can reach the object of effective inhibition Strain Target Flowmeter temperature drift.After Strain Target Flowmeter additional insulation part, still can be made into instant-plugging instrument, therefore the filled convenience of equilibrium liquid has good application prospect.
Accompanying drawing explanation
Fig. 1 is the structure principle chart of first embodiment of the present invention.
Fig. 2 is the structure principle chart of second embodiment of the present invention.
Fig. 3 is the structure principle chart of the 3rd embodiment of the present invention.
1. measuring chamber casings in figure, 2. measuring chamber, 3. target, 4. target bar, 5. bottom cylindrical shell casing, 6. cylindrical shell, 7. flexible tubing elastic body, 8. foil gauge, 9. heat insulating washer, 10. corrugated tube thermal insulation barriers, 11. pipe thermal insulation barriers, 12. corrugated tube separators.
Embodiment
Embodiment mono-
In the embodiment of Fig. 1, elastic body adopts flexible tubing 7(also can adopt other forms of elastic body, as torque tube, but the effect that this does not affect the thermal insulation barriers structure in each embodiment and suppresses Strain Target Flowmeter temperature drift, therefore it is not repeated one by one), foil gauge 8 is attached to flexible tubing 7 tube walls outsides, and corrugated tube thermal insulation barriers 10 is comprised of the circle ring disk of one section of corrugated tube and upper/lower terminal thereof.Between corrugated tube thermal insulation barriers 10 and flexible tubing 7, form a confined space, this space planted agent charges equilibrium liquid (as silicone oil), to improve the bearing capacity of corrugated tube thermal insulation barriers 10.Corrugated tube and two circle ring disks are the heat insulation material of elasticity (as silicon rubber or fluororubber), therefore three can be used as a parts integral body, make.Upper end circle ring disk inner edge and target bar 4 are tightly connected, and lower end circle ring disk outer rim and cylindrical shell 6 are tightly connected.Because axial rigidity and the bending stiffness of corrugated tube thermal insulation barriers 10 are all very little, its upper end circle ring disk inner edge is to be again tightly connected with the root of target bar 4, target bar 4 horizontal shift herein will be much smaller than the horizontal shift at target 3 places, therefore, thrust with respect to detected fluid to target bar 4, the bounce of 10 pairs of target bars 4 of corrugated tube thermal insulation barriers can be ignored.
In Fig. 1, can see, detected fluid to the heat transfer path of flexible tubing 7 mainly contains two: the one, and detected fluid is through the conduction process of measuring chamber casing 1, bottom cylindrical shell casing 5,4 pairs of flexible tubings 7 of target bar, and the 2nd, the detected fluid in cylindrical shell 6 chambeies is to the conduction process of flexible tubing 7 and Convective Heat Transfer.For article one heat transfer path, for preventing that detected fluid heat is delivered to by bottom cylindrical shell casing 5, coupling bolt, the target bar 4 of the good metal material of thermal conductivity the elastic body 7 that posts foil gauge 8 in a large number, the present embodiment is by adding heat insulating washer 9, in measures such as the coupling bolt adapted thermal sleeve of target bar 4 outer wrapping heat-barrier materials, bottom cylindrical shell casing 5 and flexible tubing 7 and heat insulating mattress between bottom cylindrical shell casing 5 and flexible tubing 7, significantly reduced the heat that this conduction process is delivered to flexible tubing 7.For second heat transfer path, the present embodiment makes flexible tubing 7 depart from directly and contact with detected fluid by the corrugated tube thermal insulation barriers 10 arranging in cylindrical shell 6 chambeies, detected fluid to conduction process and the Convective Heat Transfer of flexible tubing 7 weakened simultaneously, is delivered to elastomeric heat thereby significantly minimizing.For the occasion that requires more effectively to suppress temperature drift, also can adopt at measuring chamber casing 1 and bottom cylindrical shell casing 5 inside surfaces and apply heat-barrier material, and install heat insulating mattress additional in measuring chamber casing 1 and external pipe junction, and measures such as the coupling bolt at this place and thermal sleeve and heat insulating mattress adapteds.Because above-mentioned simple measures can significantly reduce the heat transfer capacity from detected fluid to flexible tubing 7, therefore the present embodiment can effectively suppress the temperature drift of Strain Target Flowmeter.
Embodiment bis-
In the embodiment of Fig. 2, can find out that the present embodiment is structurally substantially identical with the embodiment mono-of Fig. 1, what just use is pipe thermal insulation barriers 11.Pipe thermal insulation barriers 11 is made with the heat insulation material of elasticity (as silicon rubber or fluororubber) equally, but its axial rigidity is larger than the corrugated tube thermal insulation barriers 10 in Fig. 1 with bending stiffness, is more suitable for the occasion of measuring large flow.
Embodiment tri-
In the embodiment of Fig. 3, thermal insulation barriers needs separator of adapted, pipe thermal insulation barriers 11(also can be used corrugated tube thermal insulation barriers) be arranged between corrugated tube separator 12 and flexible tubing 7, corrugated tube separator 12 is comprised of the circle ring disk at middle corrugated tube and two ends, upper end circle ring disk inner edge and target bar 4 are tightly connected, lower end circle ring disk outer rim and cylindrical shell 6 are tightly connected, and corrugated tube and circle ring disk are made by metal material.Pipe thermal insulation barriers 11 is comprised of the circle ring disk at middle pipe and two ends, and upper end circle ring disk inner edge and target bar 4 are tightly connected, and lower end circle ring disk outer rim and cylindrical shell 6 are tightly connected, and pipe and circle ring disk are made by elasticity heat-barrier material (as silicon rubber or fluororubber).Because elasticity heat-barrier material should not directly contact with some detected fluid sometimes, therefore a side installs corrugated tube separator 12 additional in pipe thermal insulation barriers 11 pipes, the corrugated tube separator 12 of metal material is directly contacted with detected fluid.When detected fluid working pressure is little, can balance liquid, by the corrugated tube separator 12 of metal material, directly bear detected fluid pressure.When detected fluid working pressure is larger, between pipe thermal insulation barriers 11 and flexible tubing 7 and between pipe thermal insulation barriers 11 and corrugated tube separator 12, all should charge equilibrium liquid (as silicone oil).In this case, by equilibrium liquid, detected fluid pressure is passed to flexible tubing 7, by flexible tubing 7 pressure-bearings, pipe thermal insulation barriers 11 and corrugated tube separator 12 be pressure-bearing not, just very low to their requirement of strength.
Claims (5)
1. the Strain Target Flowmeter that can suppress temperature drift, by measuring chamber (2) and bottom, be communicated with measuring chamber (2) and cylindrical shell (6) two large divisions of top seal forms, vitals in two large divisions comprises the target (3) in measuring chamber (2), target bar (4) in cylindrical shell (6) inner chamber, as the elastic body (7) of the upper end sealing on cylindrical shell (6) top and be attached to the foil gauge (8) on elastic body (7), it is characterized in that: use the thermal insulation barriers (10) that does not affect target bar (4) angular displacement that the elastic body (7) on cylindrical shell (6) bottom and top is divided into two mutual disconnected spaces, bottom cylindrical shell casing (5) should install heat insulating washer (9) additional with elastic body (7) junction, this heat insulating washer (9) also can be replaced by the extension of thermal insulation barriers (10) lower end, thermal insulation barriers (10) by one section of corrugated tube and thereon, lower two ends respectively connect a circle ring disk and form, upper end circle ring disk outer rim is connected with sylphon seal, inner edge and target bar (4) are tightly connected, lower end circle ring disk inner edge is connected with sylphon seal, outer rim and cylindrical shell (6) are tightly connected, corrugated tube and two circle ring disks are made by heat-barrier material, wherein at least corrugated tube is made by elasticity heat-barrier material, in the space that thermal insulation barriers (10) and elastic body (7) surround, be filled with equilibrium liquid.
2. the Strain Target Flowmeter that can suppress temperature drift, by measuring chamber (2) and bottom, be communicated with measuring chamber (2) and cylindrical shell (6) two large divisions of top seal forms, vitals in two large divisions comprises the target (3) in measuring chamber (2), target bar (4) in cylindrical shell (6) inner chamber, as the elastic body (7) of the upper end sealing on cylindrical shell (6) top and be attached to the foil gauge (8) on elastic body (7), it is characterized in that: use the thermal insulation barriers (11) that does not affect target bar (4) angular displacement that the elastic body (7) on cylindrical shell (6) bottom and top is divided into two mutual disconnected spaces, bottom cylindrical shell casing (5) should install heat insulating washer (9) additional with elastic body (7) junction, this heat insulating washer (9) also can be replaced by the extension of thermal insulation barriers (11) lower end, thermal insulation barriers (11) by one section of pipe and thereon, lower two ends respectively connect a circle ring disk and form, upper end circle ring disk outer rim and pipe are tightly connected, inner edge and target bar (4) are tightly connected, lower end circle ring disk inner edge and pipe are tightly connected, outer rim and cylindrical shell (6) are tightly connected, pipe and two circle ring disks are made by heat-barrier material, wherein at least pipe is made by elasticity heat-barrier material, in the space that thermal insulation barriers (11) and elastic body (7) surround, be filled with equilibrium liquid.
3. the Strain Target Flowmeter that can suppress temperature drift, by measuring chamber (2) and bottom, be communicated with measuring chamber (2) and cylindrical shell (6) two large divisions of top seal forms, vitals in two large divisions comprises the target (3) in measuring chamber (2), target bar (4) in cylindrical shell (6) inner chamber, as the elastic body (7) of the upper end sealing on cylindrical shell (6) top and be attached to the foil gauge (8) on elastic body (7), it is characterized in that: use the thermal insulation barriers (11) that does not affect target bar (4) angular displacement that the elastic body (7) on cylindrical shell (6) bottom and top is divided into two mutual disconnected spaces, bottom cylindrical shell casing (5) should install heat insulating washer (9) additional with elastic body (7) junction, this heat insulating washer (9) also can be replaced by the extension of thermal insulation barriers (11) lower end, thermal insulation barriers (11) adapted a separator (12), thermal insulation barriers (11) is arranged between separator (12) and elastic body (7), separator (12) by one section of corrugated tube and thereon, lower two ends respectively connect a circle ring disk and form, upper end circle ring disk outer rim is connected with sylphon seal, inner edge and target bar (4) are tightly connected, lower end circle ring disk inner edge is connected with sylphon seal, outer rim and cylindrical shell (6) are tightly connected, corrugated tube and two circle ring disks are made by metal material, thermal insulation barriers (11) by one section of pipe and thereon, lower two ends respectively connect a circle ring disk and form, upper end circle ring disk outer rim and pipe are tightly connected, inner edge and target bar (4) are tightly connected, lower end circle ring disk inner edge and pipe are tightly connected, outer rim and cylindrical shell (6) are tightly connected, pipe and two circle ring disks are made by heat-barrier material, wherein at least pipe is made by elasticity heat-barrier material.
4. the Strain Target Flowmeter that suppresses temperature drift according to claim 3, it is characterized in that, when detected fluid working pressure is higher, in the space surrounding at thermal insulation barriers (11) and elastic body (7), be filled with equilibrium liquid, in the space surrounding at separator (12) and thermal insulation barriers (11), be also filled with equilibrium liquid.
5. according to the Strain Target Flowmeter of the suppressed temperature drift described in claim 1,2,3, it is characterized in that, target bar (4) should wrap up heat-barrier material, and the bolt that connects bottom cylindrical shell (5) and elastic body (7) is answered overcoat thermal sleeve and installs heat insulating mattress additional.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410521335.8A CN104215280A (en) | 2014-10-08 | 2014-10-08 | Strain target flowmeter capable of restraining temperature drift |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410521335.8A CN104215280A (en) | 2014-10-08 | 2014-10-08 | Strain target flowmeter capable of restraining temperature drift |
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| CN104215280A true CN104215280A (en) | 2014-12-17 |
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| CN201410521335.8A Pending CN104215280A (en) | 2014-10-08 | 2014-10-08 | Strain target flowmeter capable of restraining temperature drift |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106441472A (en) * | 2016-09-28 | 2017-02-22 | 合肥科迈捷智能传感技术有限公司 | Method for temperature drift inhibition of constant power type thermal type gas flowmeter |
| CN107702754A (en) * | 2017-11-22 | 2018-02-16 | 安徽省锐凌计量器制造有限公司 | Portable simple flowmeter |
| CN108168640A (en) * | 2017-12-28 | 2018-06-15 | 重庆联大仪表有限公司 | A kind of high-temperature medium monitors flowmeter on-line |
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| CN2226282Y (en) * | 1994-12-16 | 1996-05-01 | 烟台市招远自动化仪表厂 | Static pressure liquid level-meter sensor device |
| CN2241868Y (en) * | 1994-12-09 | 1996-12-04 | 水利部能源部地质勘探机电研究所 | Target-type flowmeter |
| CN2681092Y (en) * | 2004-01-21 | 2005-02-23 | 李渝川 | Pressure indirectly taking device for differential pressure flowmeter |
| JP3902535B2 (en) * | 2002-11-12 | 2007-04-11 | スパイラックス・サーコ リミテッド | Area type flow meter |
| CN203216544U (en) * | 2013-01-21 | 2013-09-25 | 重庆联大仪表有限公司 | Externally-attached type corrugated pipe sensor |
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2014
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1094161A (en) * | 1993-04-22 | 1994-10-26 | 北京市西城区新开通用试验厂 | High-pressure separating ratio sensor |
| CN2241868Y (en) * | 1994-12-09 | 1996-12-04 | 水利部能源部地质勘探机电研究所 | Target-type flowmeter |
| CN2226282Y (en) * | 1994-12-16 | 1996-05-01 | 烟台市招远自动化仪表厂 | Static pressure liquid level-meter sensor device |
| JP3902535B2 (en) * | 2002-11-12 | 2007-04-11 | スパイラックス・サーコ リミテッド | Area type flow meter |
| CN2681092Y (en) * | 2004-01-21 | 2005-02-23 | 李渝川 | Pressure indirectly taking device for differential pressure flowmeter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106441472A (en) * | 2016-09-28 | 2017-02-22 | 合肥科迈捷智能传感技术有限公司 | Method for temperature drift inhibition of constant power type thermal type gas flowmeter |
| CN107702754A (en) * | 2017-11-22 | 2018-02-16 | 安徽省锐凌计量器制造有限公司 | Portable simple flowmeter |
| CN107702754B (en) * | 2017-11-22 | 2023-12-22 | 安徽省锐凌计量器制造有限公司 | Portable simple flowmeter |
| CN108168640A (en) * | 2017-12-28 | 2018-06-15 | 重庆联大仪表有限公司 | A kind of high-temperature medium monitors flowmeter on-line |
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