CN1171077C - Flow meter - Google Patents
Flow meter Download PDFInfo
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- CN1171077C CN1171077C CNB981092756A CN98109275A CN1171077C CN 1171077 C CN1171077 C CN 1171077C CN B981092756 A CNB981092756 A CN B981092756A CN 98109275 A CN98109275 A CN 98109275A CN 1171077 C CN1171077 C CN 1171077C
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- shi
- measurement device
- flow measurement
- conduit
- cylinder
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Abstract
The present invention provides a flow rate meter for flowing media, which operates in accordance with the Coriolis principle, having a straight Coriolis pipe (1) conducting the flowing medium, having a vibration generator (2) acting on the Coriolis pipe (1), and having at least a measuring sensors (3) which detect Coriolis forces and/or Coriolis vibrations based on Coriolis forces, In the flow rate meter according to the invention, the temperature fluctuation and external force do not generate measuring error with the momentum, that is even an error having tiny value is not generated in any condition, also mechanical damage is not generated, therefore, a compensation cylinder (6) is arranged and the Coriolis pipe (1) is arranged inside the compensation cylinder (6).
Description
The present patent application is that application number is 921 15383.X, the applying date to be that 19 mouthfuls of Dec in 1992, denomination of invention are divided an application for ' flow measurement device '.
The present invention relates to be used for the flow measurement device of flow media, this device is pressed the work of Ke Shi (Coriolis) principle, it has at least one pilot flow medium and is straight Ke Shi conduit at least substantially, and at least one acts on the supravasal oscillator of this Ke Shi and at least one coriolis force and/or measures primary element based on the Ke Shi of coriolis force vibration.
In the throughput of flowing medium measurement mechanism of pressing the work of Ke Shi principle, people distinguish by two aspects in principle, and first Ke Shi conduit is a straight tube, and it two is that the Ke Shi conduit is to make single curved or many curved bend pipes, also can be made into the pipe ring road.In addition, the flow measurement device that people can talk about according to two aspects differences, this Ke Shi conduit of the first has only one, and it two is that this Ke Shi conduit has two; Under the situation of two Ke Shi conduits, two pipes are in series or in parallel with each other on flow technique.
In the embodiment of flow measurement device, the Ke Shi conduit is to make straight pipe or many Ke Shi conduits all are to make straight pipe, and this is simple aspect machine-building, thereby has quite low cost; Wherein the inside surface of pipe can well be processed, but as polishing.In addition, it also has the quite little pressure loss.
By the work of Ke Shi principle and make the Ke Shi conduit straight or many Ke Shi conduits are all made straight flow measurement device, at first there is such shortcoming, be that it not only produces thermal expansion or thermal stress because of being heated, and can produce measuring error and mechanical damage, i.e. stress cracking because of external force and momentum.
EP-317340A2, W088108517, US-4972724 and CN2070436U disclose the Ke Shi conduit have been arranged in the compensation cylinder, reducing the influence of temperature variation and external force and momentum, but only so still this influence can not be reduced to minimum level.
Therefore, the present invention's task is to provide a kind of this paper to start described flow measurement device, and in this device, Ke Shi pipe or some Ke Shi pipe are made straight at least substantially; Or such layout and further formation, i.e. temperature fluctuation and/or outer acting force and momentum can cause producing measuring error in no instance, even small numerical value, and/or do not produce mechanical damage.
First embodiment of flow measurement device of the present invention is characterised in that: be provided with the compensation cylinder, and the Ke Shi pipe guide is located in this compensation cylinder.Best, this Ke Shi conduit and compensation cylinder are promptly sealed with abutment ring at the two ends of compensation cylinder to be connected with each other in mode that axially can not relative motion.At this, the compensation cylinder be meant one preferably concentric with the Ke Shi conduit and surround this conduit and also be the metallic cylinder that metal Ke Shi conduit is connected with this Ke Shi conduit, by this compensation cylinder temperature fluctuation and/or outer acting force and momentum are made compensation, also be about to its influence and eliminate to minimum degree.Should be by Ke Shi conduit and the assembled unit that constitutes of compensation cylinder by this compensation cylinder and can not be subjected to the influence of temperature fluctuation and/or outer acting force and momentum where necessary by further step.
Second embodiment of flow measurement device of the present invention is characterised in that: the Ke Shi conduit is to make with the identical or close material of thermal expansivity with the compensation cylinder, is more preferably that the material of the quite low thermal expansivity of usefulness makes.Therefore, should will eliminate the influence of temperature fluctuation to a great extent by the assembled unit that Ke Shi conduit and compensation cylinder constitute.
Weak point with the flow measurement device of Ke Shi principle work is that the Ke Shi conduit of this device is straight, thereby makes it have a quite high natural frequency in a structure length of determining.Be that the curved or some Ke Shi conduits of Ke Shi catheter configurations embayment all are configured to crooked shape in the embodiment of flow measurement device, the viewpoint that has advantage according to the structure that has straight tube, this is imperfect, yet advantageously bend pipe structure has quite low natural frequency in a structure length of determining.
In addition, to people know by having of Ke Shi principle work minimum one be the flow measurement device of straight Ke Shi conduit at least substantially, what be suitable for be that its Ke Shi vibration has a quite little amplitude and therefore make obtainable measured value is very little, no matter still in the Ke Shi mode, this result is that the quite high rigidity because of the straight Ke Shi conduit of this kind produces at mode of excitation.
In addition, all talk about according to having of Ke Shi principle work minimum one be the flow measurement device of straight Ke Shi conduit at least substantially, also can produce following problem, promptly produce undesirable interference vibration with various frequencies; This disturbs the oscillation frequency of vibration frequency and desirable mode of excitation and Ke Shi mode very approaching.
Another task of the present invention is: according to these measurement results that are easy to obtain the flow measurement device that the present invention proposes is made improvements.
The 3rd embodiment according to flow measurement device of the present invention, it is characterized in that: the rigidity that is used for the Ke Shi conduit of mode of excitation is improved, particularly improve by such mode, promptly the Ke Shi conduit is used for the reinforcing spring loading that mode of excitation improves its rigidity by at least one.One independent reinforcing spring preferably only is set, and the Ke Shi conduit is reinforced spring in center loaded with this.According to the present invention, the rigidity that is used for the Ke Shi conduit of mode of excitation is to have improved, and can not produce noticeable influence to the rigidity of the Ke Shi conduit that is used for the Ke Shi mode.The oscillation frequency that so just can guarantee mode of excitation safely is sufficiently powerful with respect to the frequency of undesirable that is interference oscillatory.Therefore, the influence of this interference oscillatory has obtained suppressing more completely.
In a word, flow measurement device of the present invention has other possible layout and further structure, these comprise that on the one hand Ke Shi conduit and compensation cylinder interconnect by two abutment rings that are connected on the compensation cylinder in the end, and abutment ring uses the material the same with the Ke Shi conduit to make; The Ke Shi conduit is connected with abutment ring by welding or hard solder; The Ke Shi conduit is connected with abutment ring by vacuum brazing; The Ke Shi conduit is by a kind of nickel alloy, and anti-corrosion nickel-base alloy C22 makes by Haast; The compensation cylinder is made by the anti-corrosion nickel-base alloy C4 of Haast or by non-alloy steel AISI1078 by a kind of nickel alloy; The nickel alloy that is approximately 1000 ℃ with welding temperature is made welding material; Be provided with the outer protection cylinder of making by stainless steel; The assembled unit that is made of Ke Shi conduit, compensation cylinder and abutment ring is arranged in this protection cylinder; The protection cylinder has abutment ring two distolateral connections, that made by stainless steel; Be connected with an outwardly directed joint flange on abutment ring respectively, the connecting duct that links to each other with the Ke Shi conduit passes abutment ring and stretches in the joint flange; Ke Shi conduit and connecting duct integral body are made; Connecting duct surrounds with the reinforcing cylinder that nylon 36 is made respectively; Connecting duct is placed in stretching prestress and reinforces in the cylinder; Connecting duct is by hard solder, by vacuum brazing, and is approximately 1000 ℃ nickel alloy with welding temperature and is connected with the reinforcing cylinder; Connecting duct can be done axially-movable and respectively dispose a seal at connecting duct away from the end of Ke Shi conduit in reinforcing cylinder and joint flange.Be shown on the other hand among each embodiment.These embodiment are as follows with accompanying drawings.
In the accompanying drawings:
Fig. 1 is the longitudinal section according to first embodiment of flow measurement device of the present invention;
Fig. 2 is the local amplification view of Fig. 1;
Fig. 3 is the amplification view that the IV-IV along the line that passes through the flow measurement device shown in Fig. 1 and 2 with respect to Fig. 2 sees;
Fig. 4 is the cut-open view similar to Fig. 3, but its to be second embodiment by all the other not shown flow measurement devices of the present invention that go out cut open;
Fig. 5 is the longitudinal section by the 3rd embodiment part of flow measurement device of the present invention;
Fig. 6 is the longitudinal section by the 4th embodiment part of flow measurement device of the present invention;
Fig. 7 is the longitudinal section by the 5th embodiment part of flow measurement device of the present invention;
Fig. 8 is the longitudinal section by the 6th embodiment part of flow measurement device of the present invention;
Fig. 9 is the reduced graph by the longitudinal section of the 7th embodiment part of flow measurement device of the present invention;
Figure 10 is the sectional elevation of seeing by the II-II along the line of the structure among Fig. 9;
Figure 11 is the skeleton view with respect to the amplification of Fig. 9 and Figure 10, and the flow measurement device shown in Fig. 9 and 10 is shown the reinforcing spring.
The flow measurement device of flow media of the present invention relates to a kind of flow measurement device according to the work of Ke Shi principle.Therefore flow measurement device of the present invention has the straight Ke Shi conduit 11 (Fig. 1 to Fig. 6 and Fig. 9) of directed flow moving medium or is straight Ke Shi conduit 1 (Fig. 7, Fig. 8) substantially; Effect has an oscillator 2 and two coriolis forces and/or measures primary element 3 based on the Ke Shi of coriolis force vibration on the Ke Shi conduit, and in the embodiment shown in fig. 1, oscillator 2 works with a swing arm 4 that is arranged on the Ke Shi conduit 1.In addition, Fig. 1 shows this Ke Shi conduit 1 and also is provided with mass 5, the quality by this mass and the position can influence Ke Shi conduit 1 in a scope of determining natural frequency is set.
According to the present invention, at first be provided with a compensation cylinder 6, and Ke Shi conduit 1 is installed in this compensation cylinder 6.Do not interconnect at axial direction at this Ke Shi conduit 1 and compensation cylinder 6 with not producing relative motion.In all illustrated embodiment, the both ends of compensation cylinder 6 are connected to abutment ring 7.This abutment ring 7 can be connected with compensation cylinder 6 by welding or hard solder.Can imagine also to draw that this abutment ring also can be in distolateral screw-in compensation cylinder.Preferable is that this abutment ring 7 is to use with the same material of Ke Shi conduit 1 to make.This Ke Shi conduit 1 is by welding or hard solder, preferably is connected with abutment ring 7 by vacuum brazing.
Should illustrate that at first Ke Shi conduit 1 passes through compensation cylinder 6 or combination with it, and in case of necessity in conjunction with other measure, the influence that can make it not be subjected to influencing of temperature fluctuation and/or not be subjected to applied external force and momentum.
Make another measure of Ke Shi conduit 1 unaffected by temperature fluctuations be, Ke Shi conduit 1 is provided with in compensation cylinder 6 and draws prestress, and this draws prestress to eliminate by means of improving temperature, and the compressive stress that produces therefrom can keep within the range of permission.
If Ke Shi conduit 1 and compensation cylinder 6 can be selected special material, this practical step then, promptly " band draws the setting of prestressed Ke Shi conduit in the compensation cylinder " is useful.Preferablely be, Ke Shi conduit 1 is by nickel alloy, particularly be made of the anti-corrosion nickel-base alloy C22 of Haast, and compensation cylinder 6 is by nickel alloy, particularly constitute by the anti-corrosion nickel-base alloy C4 of Haast or by non-alloy steel AISI1078.
The front illustrates that Ke Shi conduit 1 preferably is connected with abutment ring 7 by hard solder, and comparatively suitable be to be that about 1000 ℃ nickel alloy is made welding material with welding temperature.
If in the manner described before and the material work that has illustrated with the front, the prestress that draws that the Ke Shi conduit is desired so will obtain automatically.Promptly during soldering, Ke Shi conduit 1 is more than other parts elongation, and therefore the cooling back just can obtain the desirable prestress that draws, and this draws prestress about 80 to 100MPA.
Make a kind of further measure of Ke Shi conduit 1 unaffected by temperature fluctuations be:, especially to use the made Ke Shi conduit 1 and the compensation cylinder 6 of quite small thermal expansivity with the material of identical or close thermal expansivity.According to this viewpoint, Ke Shi conduit 1 usefulness titanium that comparatively suitable is or titanium alloy and compensate the non-alloy steel of cylinder 6 usefulness, ferritic stainless steel or nickel alloy and make.
Make 1 unaffected by temperature fluctuations of Ke Shi conduit not be by another additional measure of outer acting force and momentum effects: to be provided with an outer protection cylinder 8; this cylinder 8 is preferably made with stainless steel, and is loaded on protection cylinder 8 inside by the assembled unit that Ke Shi conduit 1, compensation cylinder 6 and abutment ring 7 constitute.The feature of this embodiment preferably is: these protection cylinder 8 two ends are provided with the abutment ring of preferably being made by stainless steel 9, and two ends are sealed.On each abutment ring 9, all connect an outwardly directed joint flange 10, and the connecting pipe 11 that links to each other with Ke Shi conduit 1 extends through abutment ring 9 and enters in the joint flange 10.The mode that relatively conforms with purpose is that Ke Shi conduit 1 and connecting pipe 11 are made an integral body, preferably a whole through duct.
According to above-mentioned a large amount of reasons, what relatively conform with purpose is connecting pipe 11 to be had draw prestress to be loaded on to reinforce in the cylinder 12, and this connecting pipe 11 is by hard solder, preferably by vacuum brazing and be that about 1000 ℃ nickel alloy is connected with this reinforcing cylinder 12 with welding temperature preferably.This is shown among Fig. 3.
Such measure has been described also below, has been and makes Ke Shi conduit 1 not be subjected to the influence of temperature fluctuation and outer acting force and momentum that with Ke Shi conduit 1 with compensate the material that cylinder 6 is selected identical or close thermal expansivity for use, especially the material that thermal expansivity is quite little is made.Therefore, this embodiment according to flow measurement device of the present invention couples together connecting pipe 11 and reinforcing cylinder 12 with regard to unnecessary.This situation is shown among Fig. 4.
Measure according to the present invention has formed by " assembled unit that Ke Shi conduit 1, compensation cylinder 6 and abutment ring 7 constitute; the same just as already described mainly is that the Ke Shi conduit 1 that is used to measure more or less is the influence that is not subjected to temperature fluctuation and outer acting force and momentum.The measure front of relevant connecting pipe 11 illustrated, another was shown by possible structure shown in Figure 5 here.Promptly as described above, this connecting pipe 11 can be made corrugated, by this kind structure, thereby can guarantee safely that the assembled unit that is made of Ke Shi conduit 1, compensation cylinder 6 and abutment ring 7 can carry out thermal expansion in the scope of determining, and can not produce objectionable generally high stress.
Fig. 6,7 and 8 shows the embodiment of the flow measurement device according to the present invention, in these embodiments, use the alternate manner different to make the thermal expansion of the assembled unit that constitutes by Ke Shi conduit 1, compensation cylinder 6 and abutment ring 7 can not produce unallowed heavily stressed with Fig. 5.
In only by the embodiment shown in Fig. 6, but connecting pipe 11 is axially-movable in reinforcing cylinder 12 and joint flange 10.At this, a packoff 13 is arranged at the end away from Ke Shi pipe 1 of connecting pipe 11.The sealing device is O shape ring.Embodiment shown in Figure 6 also is fit in this situation, and promptly packoff 13 is semicircular, and is made by teflon, and loads by a spring (not shown) of being made by stainless steel.
In the embodiment shown in fig. 7, connecting pipe 11 is crooked, be S shape, and in embodiment 8, the end 14 of Ke Shi conduit 1 is crooked, i.e. the quadrant arc.The diameter of the connecting pipe 11 of this warp architecture shown in Fig. 7 is bigger than the diameter of Ke Shi conduit.Therefore, reduce or elimination fully because of the crooked pressure reduction that causes.
In the embodiment of Fig. 9 and 10, this Ke Shi conduit 1 improves its rigidity by means of one is used for mode of excitation reinforcing spring 15 loads, and reinforces spring action in the centre of Ke Shi conduit 1.The present invention's principle also can improve the rigidity of the Ke Shi conduit 1 that is used for mode of excitation, but the rigidity of the Ke Shi conduit 1 of Ke Shi mode is then unaffected.Therefore, the measure according to the present invention, now can guarantee: press mode of excitation, the frequency of the more undesirable interference oscillatory of oscillation frequency of Ke Shi conduit 1 seems sufficiently strong, and therefore, the influence of interference oscillatory has obtained enough inhibition.
Reinforcing spring 15 arranged according to the present invention can have different forms.In the embodiment shown in the figures, this reinforcing spring 15 is leaf springs, especially showing clearly in Figure 11, and is the U-shaped leaf spring that has a bridge plate 16 and two shanks 17,18, is provided with a mounting flange 19,20 that outwards points in each end of two shanks 17,18 that separated by bridge plate 16.
As top detailed description the in detail, according to the embodiment shown in the accompanying drawing of flow measurement device of the present invention, it relates to such device, and the Ke Shi conduit 1 of this device is arranged within the compensation cylinder 6, reinforces spring 15 and is arranged between Ke Shi conduit 1 and the compensation cylinder 6.In detail, the bridge plate 16 of this reinforcing spring 15 is fixed on the Ke Shi conduit 1, and its mounting flange 19,20 is fixed on the compensation cylinder 6.
Claims (14)
1. press Ke Shi principle work, the flow measurement device that is used for flow media, have at least one pilot flow medium, at least substantially be straight Ke Shi conduit, have the clapp oscillator that at least one acts on the Ke Shi conduit, and have at least one and measure coriolis force and/or measure the measuring value sensor that the Ke Shi based on coriolis force vibrates, and have one the compensation cylinder, the Ke Shi conduit is located in the compensation cylinder, Ke Shi conduit and compensation cylinder interconnect in the mode of not having axial relative motion, it is characterized in that Ke Shi conduit (1) is placed in the compensation cylinder (6) with stretching prestress.
2. flow measurement device as claimed in claim 1, it is characterized in that, Ke Shi conduit (1) and compensation cylinder (6) interconnect by two abutment rings (7) that are connected on the compensation cylinder (6) in the end, and abutment ring (7) uses the material the same with Ke Shi conduit (1) to make.
3. flow measurement device as claimed in claim 2 is characterized in that, Ke Shi conduit (1) is connected with abutment ring (7) by welding or hard solder.
4. flow measurement device as claimed in claim 3 is characterized in that, Ke Shi conduit (1) is connected with abutment ring (7) by vacuum brazing.
5. flow measurement device as claimed in claim 3 is characterized in that, Ke Shi conduit (1) is by a kind of nickel alloy, and anti-corrosion nickel-base alloy C22 makes by Haast.
6. flow measurement device as claimed in claim 5 is characterized in that, compensation cylinder (6) is made by the anti-corrosion nickel-base alloy C4 of Haast or by non-alloy steel AISI 1078 by a kind of nickel alloy.
7. flow measurement device as claimed in claim 6 is characterized in that, the nickel alloy that is approximately 1000 ℃ with welding temperature is made welding material.
8. flow measurement device as claimed in claim 1 is characterized in that, is provided with the outer protection cylinder of being made by stainless steel (8); The assembled unit that is made of Ke Shi conduit (1), compensation cylinder (6) and abutment ring (7) is arranged in this protection cylinder (8); Protection cylinder (8) has abutment ring (9) two distolateral connections, that made by stainless steel; Be connected with an outwardly directed joint flange (10) on abutment ring (9) respectively, the connecting duct (11) that links to each other with Ke Shi conduit (1) passes abutment ring (9) and stretches in the joint flange (10).
9. flow measurement device as claimed in claim 8 is characterized in that, Ke Shi conduit (1) and connecting duct (11) integral body are made.
10. flow measurement device as claimed in claim 9 is characterized in that, connecting duct (11) surrounds with the reinforcing cylinder (12) that nylon 36 is made respectively.
11. flow measurement device as claimed in claim 10 is characterized in that, connecting duct (11) is placed in stretching prestress and reinforces in the cylinder (12).
12. flow measurement device as claimed in claim 11 is characterized in that, connecting duct (11) is by hard solder, by vacuum brazing, and is approximately 1000 ℃ nickel alloy with welding temperature and is connected with reinforcing cylinder (12).
13. flow measurement device as claimed in claim 10 is characterized in that, connecting duct (11) can be done axially-movable in reinforcing cylinder (12) and joint flange (10).
14. flow measurement device as claimed in claim 13 is characterized in that, respectively disposes a seal (13) at connecting duct (11) away from the end of Ke Shi conduit (1).
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4142040 | 1991-12-19 | ||
| DEP4142040.3 | 1991-12-19 | ||
| DE4200060A DE4200060C2 (en) | 1991-12-19 | 1992-01-03 | Mass flow meter |
| DEP4200060.2 | 1992-01-03 |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN92115383A Division CN1046027C (en) | 1991-12-19 | 1992-12-19 | Flow measurer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1226679A CN1226679A (en) | 1999-08-25 |
| CN1171077C true CN1171077C (en) | 2004-10-13 |
Family
ID=25910294
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98109274 Expired - Fee Related CN1132001C (en) | 1991-12-19 | 1998-05-21 | Flow meter |
| CNB981092756A Expired - Lifetime CN1171077C (en) | 1991-12-19 | 1998-05-21 | Flow meter |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98109274 Expired - Fee Related CN1132001C (en) | 1991-12-19 | 1998-05-21 | Flow meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN1132001C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7005019B2 (en) * | 2001-11-26 | 2006-02-28 | Emerson Electric Co. | Manufacturing flow meters having a flow tube made of a fluoropolymer substance |
| EP3163262B1 (en) * | 2015-10-28 | 2018-04-11 | Atsuden Co., Ltd | Coriolis mass flow meter |
-
1998
- 1998-05-21 CN CN 98109274 patent/CN1132001C/en not_active Expired - Fee Related
- 1998-05-21 CN CNB981092756A patent/CN1171077C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CN1132001C (en) | 2003-12-24 |
| CN1226679A (en) | 1999-08-25 |
| CN1226678A (en) | 1999-08-25 |
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|---|---|---|---|
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| C14 | Grant of patent or utility model | ||
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Expiration termination date: 20121219 Granted publication date: 20041013 |