CN1688871A - Commutating device - Google Patents
Commutating device Download PDFInfo
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- CN1688871A CN1688871A CN 03823588 CN03823588A CN1688871A CN 1688871 A CN1688871 A CN 1688871A CN 03823588 CN03823588 CN 03823588 CN 03823588 A CN03823588 A CN 03823588A CN 1688871 A CN1688871 A CN 1688871A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
- F15D1/00—Influencing flow of fluids
- F15D1/02—Influencing flow of fluids in pipes or conduits
- F15D1/025—Influencing flow of fluids in pipes or conduits by means of orifice or throttle elements
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- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Measuring Volume Flow (AREA)
- Details Of Flowmeters (AREA)
Abstract
A straightening device (4) installed in a flow passage (10) formed by a pipe (2a) on the upstream side of a flow velocity sensor (3) of a flowmeter, comprising a first straightening net (8) disposed apart from the flow velocity sensor and a second straightening net (6) disposed close to the flow velocity sensor, wherein the first straightening net has meshes smaller than those of the second straightening net to exclude foreign matter included in fluid so as to prevent the second straightening net from being clogged by the foreign matter, and the flow of the fluid around the flow velocity sensor is stabilized by the straightening action of the second straightening net to prevent the measuring accuracy of the fluid sensor from being lowered by the turbulence of the flow of the fluid.
Description
Technical field
The present invention relates to fairing, relate in particular to the fairing that the gas that flows to detecting element in the stream that is equipped with the detecting element that flowmeter possesses is stably carried out rectification.
Background technology
Mass flowmeter be used for to flow in the fluid in the stream that is divided into by pipeline etc., the flow of for example gas measures, generally speaking, for example possess flow sensor and to the output signal of flow sensor carry out signal Processing, flow is asked the detecting element of the transformation component of calculation.Flow velocity and the long-pending aggregate-value of calculating instantaneous delivery or calculating instantaneous delivery that multiply by mutually of known pipeline section that transformation component is represented with sensor output signal.
For this kind flowmeter, the gas generation bias current in flowing in pipeline or when turbulent flow, the instrumentation precise decreasing of flow sensor then, the flow measurement meeting produces error.Therefore, be provided with for upstream side at flow sensor rectifier cells such as cowling panel or screens, with this rectifier cell the gas that flows to flow sensor is carried out rectification and is well known by the way of the reduction of bias current or the mensuration precision that causes of turbulent flow preventing.
Employing possesses the flowmeter of rectifier cell, can make flow sensor gas flow stabilization on every side, can prevent because of the bias current of gas or the reduction of turbulent caused mensuration precision, yet, because of the foreign matter that in gas, contained, so there is the situation of the part generation eyelet obstruction in many perforation paths (hole or mesh) that rectifier cell possesses.In addition, get rid of and use net though at the upstream side of rectifier cell foreign matter is set sometimes, yet even also can the eyelet obstruction take place in this case because of getting rid of with the smaller foreign matter of netting by foreign matter.Which kind of situation no matter, as long as the part generation eyelet of rectifier cell stops up, then the rectified action meeting of each one of rectifier cell becomes inhomogeneous, by rectifier cell flow to detecting element, the air-flow that for example flows to flow sensor can get muddled, and produces the problem of the instrumentation precise decreasing of flow sensor.
Summary of the invention
The objective of the invention is to, provide a kind of prevent because of contained foreign matter in the fluid in the stream that flows in the detecting element that is equipped with flowmeter cause each one of made rectifier cell that the rectifier cell eyelet stops up the rectified action homogenising, can make the fluid stabilization that flows make the mensuration precision of detecting element keep good fairing.
For achieving the above object, fairing of the present invention, possess the upstream side of the detecting element that in stream, is equipped on flowmeter the 1st rectifier cell, and in above-mentioned stream, be equipped on the 2nd rectifier cell between above-mentioned the 1st rectifier cell and the above-mentioned detecting element, it is characterized in that the flow path areas that are formed at many 1st perforation paths on above-mentioned the 1st rectifier cell are less than many 2nd flow path areas that connect paths that are formed on above-mentioned the 2nd rectifier cell.
Flow in the rectification that fluid in the stream at first is subjected to the 1st rectifier cell of fairing, then, be subjected to the rectification of the 2nd rectifier cell after, arrive the flowmeter detecting element around.So, fairing of the present invention obtains rectified action 2 stages at least, thereby can carry out respond well rectification, the mobile acquisition stabilization of the fluid around the detecting element has prevented the instrumentation precise decreasing because of fluid mobile disorder causing detecting element.
The mobile situation about getting muddled of fluid on every side that rectifier cell can the eyelet obstruction take place because of foreign matter, be positioned at the detecting element in rectifier cell downstream takes place in occasion sometimes that contain foreign matter in the fluid in flowing in stream.To this, fairing of the present invention is removed foreign matter in the fluid, is prevented that the 2nd rectifier cell generation eyelet from stopping up with the 1st rectifier cell, thereby prevents the generation of the disorder that fluid flows.
That is, size is caught by the 1st rectifier cell greater than the 1st big foreign matter that connects the flow path area of path and can't be flowed to the 2nd rectifier cell.In addition, size flows through the 1st rectifier cell less than the 1st little foreign matter that connects the flow path area of path with fluid, flow to the 2nd rectifier cell, because the 2nd of the 2nd rectifier cell connects the flow path area of path and connects path greater than the 1st of the 1st rectifier cell, therefore, the foreign matter by the 1st rectifier cell also can pass through the 2nd rectifier cell.
So, get rid of the upstream side that the 1st rectifier cell of function is equipped on the 2nd rectifier cell on the fluid flow direction, rely on the 1st rectifier cell to prevent that the 2nd rectifier cell generation eyelet from stopping up having rectification function and foreign matter concurrently.Really, the carrying out that gets rid of along with the foreign matter of the 1st rectifier cell, eyelet can take place and stop up in the 1st rectifier cell, therefore there is the uneven possibility that becomes in the rectified action of the 1st rectifier cell, even but under this occasion, flow in the fluid of the 2nd rectifier cell in downstream of the 1st rectifier cell and be not mixed with the big foreign matter that the 2nd rectifier cell generation eyelet is stopped up, thereby the 2nd rectifier cell generation eyelet possibility of jamming becomes minimum.Therefore, rely on the 2nd rectifier cell of the upstream side that is positioned at detecting element can bring into play uniform rectified action, thereby make the mobile stabilization of fluid around the detecting element, can prevent the reduction of the mensuration precision of detecting element reliably.Its result is even in the many mensuration environment of foreign matters such as dust, also can stablize, implement reliably flow measurement.
Among the present invention, the 1st and the 2nd rectifier cell can adopt multiple formation.For example, can adopt the 1st and the 2nd screens to constitute.The the 1st and the 2nd screens has many 1st meshes and many 2nd meshes corresponding respectively with above-mentioned many 1st and the 2nd perforation paths respectively, and the size of each the 1st mesh is less than the size of each the 2nd mesh.In addition, the 1st and the 2nd screens can constitute multiple shape with various materials, for example, constitutes square, sexangle etc. with metal material or synthetic resin material.
Among the present invention, also can between the 1st rectifier cell and the 2nd rectifier cell, set the middle rectifier cell (for example screens) more than 1, the flow path area of many perforation paths that middle rectifier cell is possessed is greater than many 1st flow path areas that connect paths of the 1st rectifier cell, and is advisable with many 2nd flow path areas that connect paths less than the 2nd rectifier cell.Adopt this preferable example, because not only rely on middle rectifier cell performance rectified action, and, rely on this centre rectifier cell can prevent more reliably that the eyelet that is equipped near the 2nd rectifier cell of detecting element from stopping up, thereby, can further improve the mensuration precision.
Fairing of the present invention also is equipped on the flowmeter that the stream inner fluid carries out the detecting element under the environment of two-way flow applicable to possessing.During this occasion, fairing of the present invention, it is characterized in that, in stream, also possess and be equipped on relative detecting element and be positioned at the above-mentioned the 1st and the 3rd and the 4th rectifier cell of the opposition side of the 2nd rectifier cell, above-mentioned the 4th rectifier cell is equipped on the position than the more close detecting element of above-mentioned the 3rd rectifier cell, and the flow path areas that are formed at many 3rd perforation paths on above-mentioned the 3rd rectifier cell are less than many 4th flow path areas that connect paths that are formed on above-mentioned the 4th rectifier cell.
In this preferable example, when fluid flows to detecting element by the 1st and the 2nd rectifier cell, as mentioned above, bigger foreign matter is caught by the 1st rectifier cell, and owing to the little foreign matter by the 1st rectifier cell also can pass through the 2nd rectifier cell, thereby, can prevent that the eyelet of the 2nd rectifier cell from stopping up.In addition, when fluid flows round about, because the 3rd of the 3rd rectifier cell connects the flow path area of path connects path less than the 4th of the 4th rectifier cell flow path area, thereby big foreign matter is caught by the 3rd rectifier cell, little foreign matter by the 3rd rectifier cell also can pass through the 4th rectifier cell, therefore, the 4th rectifier cell generation eyelet possibility of jamming is minimum.So, because the eyelet that is equipped on the both sides of detecting element and is positioned at its 2nd and the 4th rectifier cell nearby stops up and is prevented, can rely on the 2nd and the 4th rectifier cell to bring into play uniform rectified action, therefore, how the direction no matter detecting element fluid on every side flows can both obtain to stablize, and can keep the mensuration precision of detecting element well.
In addition, the flowmeter that uses with fairing of the present invention can be mass flowmeter, and it constitutes: possess the flow sensor as above-mentioned detecting element; And the flow that the output signal of flow sensor is carried out signal Processing, convection cell is asked the transformation component of calculation.But the fluid around the fairing steady flow speed sensors of the present invention flows, and can prevent the instrumentation precise decreasing of the flow sensor that causes because of the fluid movement disorder.That is, fairing of the present invention is particularly useful for mass flowmeter.
The simple declaration of accompanying drawing
Fig. 1 is the summary sectional view of the flowmeter that possesses fairing of the embodiment of the invention 1.
Fig. 2 A is the general principal view of the 1st screens that fairing possessed of presentation graphs 1.
Fig. 2 B is the general principal view of the middle screens that fairing possessed.
Fig. 2 C is the general principal view of the 2nd screens of expression fairing.
Fig. 3 is the skeleton diagram of the fairing of the expression embodiment of the invention 2.
Embodiment
Below, with reference to Fig. 1 and Fig. 2, the fairing of the embodiment of the invention 1 is described.
As shown in Figure 1, the test section 1 of mass flowmeter has: constitute thick-walled pipe 2a shell body 2, that its cross section is rounded; And be installed on detecting element, for example flow sensor 3 on this pipe 2a.Pipe 2a has upstream side pipe half 2c of and reaches smaller downstream side pipe half 2d of of internal diameter by comparison, and two pipe half 2c of, 2d constitute stage portion 2e and form as one mutually on the pipe inner peripheral surface.Connecting unshowned pipe in 2 chromosomes respectively on the two ends of pipe 2a.Numbering 2b represents to connect for this pipe the flange of usefulness.
Flow sensor 3, be positioned at the pipe 2a stage portion 2e near the position on, radially connect the perisporium of downstream side pipe half 2d of and extend, have to face and divide the test side 3a that the stream 10 form sets by the inner peripheral surface of pipe 2a, to flow in the fluid in the stream 10, the flow velocity of for example gas carries out instrumentation.Except that flow sensor 3, mass flow sensor also possesses: to carry out with the output signal of upper sensor 3 signal Processing with the instantaneous delivery of calculating fluid, and and then instantaneous delivery added up transformation component 11 to calculate integrated flow; And the display part 12 that the value of calculating of instantaneous delivery and integrated flow is shown.
Fairing 4 is equipped on the inner face of upstream side pipe half 2c of, and is fixed on the pipe 2a by stationary installation 5.That is, fairing 4 fixedly is equipped on the upstream side of the flow sensor of seeing to fluid flow direction 3.
Specifically, fairing 4 possesses 3 screenses 6～8 and 3 tubular distance pieces 9, and screens 6～8 for example is made of metal material.2a has round section because of pipe, and each screens 6～8 is all rounded, and each tubular distance piece 9 forms cylindric.In addition, as stationary installation 5, for example adopt the cylinder threaded line pipe.
Screens 6～8 is by the stage portion 2e supporting of tubular distance piece 9 and pipe 2a, and longshore current body flow direction is equipped in the pipe 2a spaced reciprocally.The internal diameter of the external diameter of screens 6～8 and tubular distance piece 9 and upstream side pipe half 2c of is roughly the same, the internal diameter of the internal diameter of tubular distance piece 9 and downstream side pipe half 2d of is roughly the same, prevents to manage mobile the getting muddled of fluid in the 2a by means of the fairing 4 that is provided with on the pipe inner face.
Screens 6 has many square meshes, and each mesh is divided and formed the square perforation path (one of them is represented with numbering 6a) that fluid is passed through.Similarly, also have many meshes that the formation of dividing connects path 7a, 8a on the screens 7,8.Yet shown in Fig. 2 A to Fig. 2 C, the mesh size of screens 6 (that is, each mesh is divided the flow path area of the perforation path 6a that forms) is different with the mesh size of screens 7,8.
Specifically, length direction to pipe 2a is seen the locational upstream side screens (the 1st screens) 8 that is positioned at away from flow sensor 3, have for example mesh size of the minimum of No. 100 (mesh) (mesh count is 100 per square inch), and be positioned at flow sensor 3 nearby the downstream screens of position (the 2nd screens) 6 have for example mesh size of the maximum of No. 40 (mesh).The mesh size that is equipped on the middle screens 7 between the 1st screens 8 and the 2nd screens 6 for example is No. 60 (mesh), greater than the mesh size of the 1st screens less than the mesh size of the 2nd screens.
Screens 6～8, when fluid during by many meshes that each screens possessed fluid flow play rectified action.Generally speaking, more little its rectified action of mesh size is strong more, and the pressure loss also increases simultaneously, thereby, should consider and be determined aptly from the big or small degree of the rectified action and the pressure loss mesh size.
Cylinder threaded line pipe 5 is formed with pin thread 5c on its outer peripheral face, can screw with the inner peripheral surface of the band female screw 2f that manages 2a.In addition, for example be formed with 2 pin-and-hole 5d on the annular end face 5a of cylinder threaded line pipe 5, as described below, can utilize this pin-and-hole 5d that cylinder threaded line pipe 5 spiral shells are loaded on the pipe 2a.In addition, the internal diameter of the internal diameter of cylinder threaded line pipe 5 and downstream side pipe half 2d of and tubular distance piece 9 is roughly the same.
Below, the number of assembling steps of fairing 4 is described.
When assembling fairing 4, at first, successively the 2nd screens the 6, the 1st tubular distance piece 9, middle screens the 7, the 2nd tubular distance piece the 9, the 1st screens 8 and the 3rd tubular distance piece 9 are packed in upstream side pipe half 2c of, then, usefulness has utensil (omitting diagram) the rotating cylinder threaded line pipe 5 of distinguishing chimeric pin with the pin-and-hole 5d of cylinder threaded line pipe 5.Cylinder threaded line pipe 5 advances in pipe 2a with rotation, until its inner face 5b and the 3rd tubular distance piece 9 butts and the 2nd screens 6 and the stage portion 2e crimping of managing 2a.In addition, the circumference of the 2nd screens 6 is fixed by pipe stage portion 2e and 9 clampings of the 1st tubular distance piece, and the circumference of screens 7,8 also is held between the tubular distance piece 9 and is fixed.So, the screens 6～8 of fairing 4 and tubular distance piece 9 can not be fixed in upstream side pipe half 2c of vertically movably.That is, fairing 4 is arranged at the upstream side position of the flow sensor 3 in the pipe 2a.Because the internal diameter of the internal diameter of tubular distance piece 9 and two pipe half 2c of, 2d is roughly the same, do not produce big step between tubular distance piece inner face and the pipe inner face, fluid can flow in pipe 2a swimmingly.
In addition, also can between fairing 4 and cylinder threaded line pipe 5, pack into spring washer (wave-shaped ring) with the roughly the same ring-type of the internal diameter of cylinder threaded line pipe 5 and external diameter.Because spring washer has uniform elasticity for the rubber-like thin plate along the circumferential direction being formed the thing of waveform for axial compression.Thereby, can prevent to cause the loose of cylinder threaded line pipe 5 by using spring washer because of reasons such as vibration or impacts.
Below, the effect of fairing 4 is described.
Representing to flow in pipe 2a with reference to numbering A and divide fluid, for example gas flow direction in the stream 10 that forms among Fig. 1.That is, by do not do illustrated pipeline to pipe 2a gas supplied successively through the 1st screens 8, middle screens 7 and the 2nd screens 6 carry out rectification arrive flow sensor 3 around.So, owing to obtain rectified action 3 stages, it is stable to arrive flow sensor 3 gas flow acquisition on every side, thereby prevents to cause because of turbulent flow the instrumentation precise decreasing of flow sensor 3.
And for the occasion that contains foreign matter, for example dust in the gas that flows in the stream 10, size can not flow to the downstream of the 1st screens 8 greater than its current prevention that is subjected to the 1st screens 8 of dust of the mesh size of the 1st screens 8.In addition, size is less than the dust of the mesh size of the 1st screens 8, with air communication cross the 1st screens 8 flow in the middle of screens 7 because the mesh size of middle screens 7 is greater than the mesh size of the 1st screens 8, the dust by the 1st screens 8 also can pass through middle screens 7.Same reason, the dust by middle screens 7 also can pass through the 2nd screens 6.
So, because bigger dust is removed from gas through the 1st screens 8, flow into that no longer to contain size in the gas of screens 7,6 in the 1st screens 8 downstreams big to the dust that screens 7,6 eyelets are stopped up, it is minimum that the eyelet possibility of jamming take place screens 7,6.Thereby, can utilize screens 7,6 and produce uniform rectified action, the gas flow around the flow sensor 3 is stablized.For this reason, utilize flow sensor 3 to measure well to the instantaneous velocity precision that flows in the gas in the stream 10.The output signal of flow sensor 3 is sent to transformation component 11, the sectional area of transformation component 11 by instantaneous velocity that sensor output signal is represented and stream 10 multiplies each other to ask and calculates the instantaneous delivery that flows in the gas in the stream 10, and then, instantaneous delivery and integrated flow are calculated hereto integrated flow mutually.And, show by 12 pairs of instantaneous deliveries of display part and integrated flow.
In the fairing 4, because screens 6～8 and tubular distance piece 9 are pushed, are fixed on the inner peripheral surface of pipe 2a by cylinder threaded line pipe 5, even when housing 2 is subjected to occasion from the vibration or the impact of outside, can prevent reliably that also screens 6～8 and tubular distance piece 9 from deforming or being shifted, can prevent to flow in gas generation bias current or turbulent flow in the stream 10.In this respect, fairing 4 also plays effect for the reduction of the mensuration precision that prevents flowmeter.
Below, with reference to Fig. 3 the fairing of the embodiment of the invention 2 is described.
The fairing 4 of embodiment 2 ' the be applicable to mass flowmeter of the flow sensor 3 that possesses in the environment that is equipped on fluid two-way flow in stream, except that the both sides at flow sensor 3 are provided with the screens this point, have the basic comprising roughly the same with the fairing 4 of embodiment shown in Figure 11.For this reason, in Fig. 3 only to screens 6,8,6 ', 8 ' represented with the relative position relation of flow sensor 3.
As shown in Figure 3, fairing 4 ' possess is used for the 1st and the 2nd screens 8,6 that the fluid, for example gas flow that flow to the direction of arrow A in the stream corresponding with the stream 10 of Fig. 1 are carried out rectification, and this point is identical with the formation of the fairing 4 of Fig. 1.Yet, different with fairing 4, the middle screens 7 of fairing 4 ' do not possess.In addition, the 1st and the 2nd screens 8,6 forms ellipse respectively, and the mesh size of the two for example is No. 100 (mesh) and No. 60 (mesh).
Fairing 4 ' also possess be used for to the fluid that in stream, flows to the direction of arrow B carry out the 3rd and the 4th screens 8 of rectification ', 6 '.Opposition side in the 3rd screens 8 ' the be equipped on stream with respect to the 1st screens 8 of flow sensor 3, and to be advisable on the equipping position that it is equipped on relative velocity sensor 3 and the 1st screens 8 symmetries.In addition, the opposition side in the 4th screens 6 ' the be equipped on stream with respect to the 2nd screens 6 of flow sensor 3, and to be advisable on the equipping position that is equipped on relative velocity sensor 3 and the 2nd screens 6 symmetries.And, the 3rd screens 8 ' have less than the 4th screens 6 ' the mesh size of mesh size.Among the embodiment 2, the 3rd and the 4th screens 8 ', 6 ' mesh size identical with the 1st and the 2nd screens 8,6, for example be No. 100 (mesh) and No. 60 (mesh).
Fairing 4 ' effect and fairing 4 roughly the same.Promptly, when fluid, for example gas pass through the 1st and the 2nd screens 8,6 when the direction of arrow A flows, bigger foreign matter, for example dust are caught by the 1st screens 8, and can also can pass through the 2nd screens 6 by the smaller dust of the 1st screens 8, thereby, can prevent that the 2nd screens 6 from eyelet taking place stop up.In addition, when gas when the direction of arrow B flows, because the 3rd screens 8 ' mesh size less than the 4th screens 6 ', big dust is by the 3rd screens 8 ' seizure, can by the 3rd screens 8 ' little dust also can pass through the 4th screens 6 ', thereby the 4th screens 6 ' generation eyelet possibility of jamming is little.Therefore, can be by the uniform rectified action of the 2nd and the 4th screens 6,6 that is equipped on flow sensor 3 both sides ' produce, thereby, the aspect effect that the air-flow of the gas around the flow sensor 3 is not flowed can both obtain to stablize, the mensuration precision of flow sensor 3 can be kept well, and the utilizable flow meter is implemented flow measurement respond wellly.
The present invention is not limited to the foregoing description 1 and embodiment 2, can carry out various deformation.
For example, though in embodiment 1,2, adopted circular or oval-shaped screens, screens can form different shape according to the flowing path section shape.In addition, in an embodiment, adopt constitute by metal material and screens that have square mesh, yet the constituent material of screens and shape of a mesh etc. are not limited by this, for example can constitute screens yet with the synthetic resin material.In addition, the mesh size of recording and narrating among two embodiment only is example, is not limited to these mesh sizes.
Among the embodiment 1, screens in the middle of being provided with 1 between the 2nd screens in the 1st screens of upstream side and downstream also can set middle the screens more than 2 or remove the centre screens.In addition, and nonessential mesh size with middle screens is arranged to less than the 2nd screens, also can use the middle screens of the mesh size identical or bigger by comparison with the mesh size of the 2nd screens.
Among the embodiment 2, with the 3rd and the 4th screens 8 ', 6 ' be arranged on the equipping position of relative velocity sensor and the 1st and the 2nd screens 8,6 symmetries, yet, and nonessential with the 3rd and the 4th screens 8 ', 6 ' be arranged on the equipping position of the relative the 1st and the 2nd screens 8,6 symmetries.In addition, also can be in embodiment 2 at the middle screens that is provided with between the 1st screens and the 2nd screens or between the 3rd screens and the 4th screens more than 1.
In addition, among the embodiment 1,2, adopted screens, also can be other rectifier cell, for example replace screens and used with the cowling panel that is formed with many thin footpath through holes as the perforation path that passes through for fluid as rectifier cell.
In other respects, the present invention can carry out various deformation equally, for example, and when being fixed in fairing in the pipe, and nonessential use cylinder threaded line pipe and tubular distance piece.
Claims (6)
1. a fairing is characterized in that, possess the upstream side of the detecting element that in stream, is equipped on flowmeter the 1st rectifier cell, and in above-mentioned stream, be equipped on the 2nd rectifier cell between above-mentioned the 1st rectifier cell and the above-mentioned detecting element,
The flow path areas that are formed at many 1st perforation paths on above-mentioned the 1st rectifier cell are less than many 2nd flow path areas that connect paths that are formed on above-mentioned the 2nd rectifier cell.
2. fairing according to claim 1 is characterized in that,
The the above-mentioned the 1st and the 2nd rectifier cell constitutes by having corresponding to the 1st screens of above-mentioned many 1st many 1st meshes that connect paths and having corresponding to many 2nd above-mentioned the 2nd screenses that connect many 2nd meshes of paths respectively,
The size of each above-mentioned the 1st mesh is less than the size of each above-mentioned the 2nd mesh.
3. fairing according to claim 1 is characterized in that,
Also possess the middle rectifier cell more than 1 that is equipped between above-mentioned the 1st rectifier cell and above-mentioned the 2nd rectifier cell,
The flow path area of many perforation paths that rectifier cell is possessed in the middle of above-mentioned is greater than many 1st flow path areas that connect path of above-mentioned the 1st rectifier cell.
4. fairing according to claim 3 is characterized in that, the flow path area of many perforation paths that above-mentioned middle rectifier cell is possessed is less than many 2nd flow path areas that connect paths of above-mentioned the 2nd rectifier cell.
5. fairing according to claim 1 is characterized in that,
The opposition side the locational the 3rd and the 4th rectifier cell that in above-mentioned stream, also possess the above-mentioned the 1st and the 2nd rectifier cell that are equipped on above-mentioned relatively detecting element,
Above-mentioned the 4th rectifier cell is equipped on the position than the more approaching above-mentioned detecting element of above-mentioned the 3rd rectifier cell,
Many the 3rd perforation paths that are formed on above-mentioned the 3rd rectifier cell have than many 4th little flow path areas of flow path area that connect paths that are formed on above-mentioned the 4th rectifier cell.
6. fairing according to claim 1, it is characterized in that, be applicable to the mass flowmeter that has the flow sensor that constitutes above-mentioned test section and the flow that the output signal of above-mentioned flow sensor is carried out signal Processing, convection cell is asked the transformation component of calculation.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002251040A JP2004093170A (en) | 2002-08-29 | 2002-08-29 | Flow straightener |
| JP251040/2002 | 2002-08-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1688871A true CN1688871A (en) | 2005-10-26 |
| CN100356142C CN100356142C (en) | 2007-12-19 |
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ID=31986257
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB038235889A Expired - Fee Related CN100356142C (en) | 2002-08-29 | 2003-08-29 | Commutating device |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP2004093170A (en) |
| CN (1) | CN100356142C (en) |
| AU (1) | AU2003257601A1 (en) |
| DE (1) | DE10393177B4 (en) |
| WO (1) | WO2004025226A1 (en) |
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| US7415895B2 (en) | 2005-08-26 | 2008-08-26 | Smc Kabushiki Kaisha | Flow meter with a rectifying module having a plurality of mesh members |
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| JP6472353B2 (en) * | 2015-08-20 | 2019-02-20 | アズビル金門株式会社 | Secondary rectifier of pilot type governor |
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| DE3009382A1 (en) * | 1980-03-12 | 1981-09-24 | Degussa Ag, 6000 Frankfurt | DEVICE FOR MEASURING THE FLOW VELOCITIES OF GASES AND LIQUIDS |
| JPS60161825U (en) * | 1984-04-04 | 1985-10-28 | 日本光電工業株式会社 | flysch type pneumotachograph |
| US4961348A (en) * | 1988-12-16 | 1990-10-09 | Ulrich Bonne | Flowmeter fluid composition correction |
| US5081866A (en) * | 1990-05-30 | 1992-01-21 | Yamatake-Honeywell Co., Ltd. | Respiratory air flowmeter |
| US5220830A (en) * | 1991-07-09 | 1993-06-22 | Honeywell Inc. | Compact gas flow meter using electronic microsensors |
| JPH0518795A (en) * | 1991-07-15 | 1993-01-26 | Hitachi Ltd | Flow straightening duct and gas flow measuring device |
| FR2687219B1 (en) * | 1992-02-11 | 1994-04-15 | Faure Herman Ets | TRANQUILIZER DEVICE FOR COUNTING FLUID FLOW. |
| JPH0742599A (en) * | 1993-08-02 | 1995-02-10 | Mazda Motor Corp | Intake air quantity detecting device for engine |
| US5596969A (en) * | 1995-10-02 | 1997-01-28 | Cummins Engine Company, Inc. | Flow conditioning gas mass sensor |
| CN1135366C (en) * | 1997-12-15 | 2004-01-21 | 东京瓦斯株式会社 | Flowmeter |
| JP2001241979A (en) * | 2000-03-01 | 2001-09-07 | Matsushita Electric Ind Co Ltd | Gas safety device |
-
2002
- 2002-08-29 JP JP2002251040A patent/JP2004093170A/en active Pending
-
2003
- 2003-08-29 WO PCT/JP2003/011095 patent/WO2004025226A1/en active Application Filing
- 2003-08-29 DE DE10393177T patent/DE10393177B4/en not_active Expired - Fee Related
- 2003-08-29 AU AU2003257601A patent/AU2003257601A1/en not_active Abandoned
- 2003-08-29 CN CNB038235889A patent/CN100356142C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102454489A (en) * | 2010-10-15 | 2012-05-16 | 北汽福田汽车股份有限公司 | Air rectifying device, and air inlet system for engine |
| CN102767415A (en) * | 2011-05-06 | 2012-11-07 | 上海通用汽车有限公司 | Exhaust system, engine and automobile comprising same and supercharger performance improving method |
| CN105673626A (en) * | 2016-03-31 | 2016-06-15 | 中国海洋大学 | Turbulence flow-to-laminar flow casing pipe heating temperature field collection device |
| CN105673626B (en) * | 2016-03-31 | 2017-11-10 | 中国海洋大学 | Turbulent flow becomes laminar flow sleeve pipe heating-up temperature field harvester |
| CN107167194A (en) * | 2017-05-02 | 2017-09-15 | 四川菲罗米特仪表有限公司 | A kind of gas pipeline rectifier |
| CN107167194B (en) * | 2017-05-02 | 2019-07-26 | 四川菲罗米特仪表有限公司 | A kind of gas pipeline rectifier |
Also Published As
| Publication number | Publication date |
|---|---|
| DE10393177T5 (en) | 2005-10-20 |
| AU2003257601A8 (en) | 2004-04-30 |
| AU2003257601A1 (en) | 2004-04-30 |
| WO2004025226A1 (en) | 2004-03-25 |
| CN100356142C (en) | 2007-12-19 |
| JP2004093170A (en) | 2004-03-25 |
| DE10393177B4 (en) | 2013-08-22 |
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