CN202066532U - DL-shaped pipeline flow sensing device - Google Patents
DL-shaped pipeline flow sensing device Download PDFInfo
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- CN202066532U CN202066532U CN2010205928979U CN201020592897U CN202066532U CN 202066532 U CN202066532 U CN 202066532U CN 2010205928979 U CN2010205928979 U CN 2010205928979U CN 201020592897 U CN201020592897 U CN 201020592897U CN 202066532 U CN202066532 U CN 202066532U
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Abstract
The utility model discloses a DL-shaped pipeline flow sensing device which can not only automatically monitor and sense the flow of the fluid in the pipe and but also serve as an essential standard pipe fitting for the pipeline, and has no fluid flow measuring addition energy loss. An interface is connected with a universal standard signal sensor and a universal standard digital flow meter, so as to realize the automatic sensing detection output of a fluid flow signal in the pipeline and the flow digital display. The DL-shaped pipe flow sensing device has the characteristics that the DL-shaped pipe flow sensing device has a simple structure, is free from maintenance, and can reduce the construction cost.
Description
1. technical field
The utility model, relate to a kind of pipeline flow sensing device, it not only can monitor sensing automatically to the flow of pipeline fluid, and can also be as requisite a kind of standard pipe fitting on the pipeline, no measurement of fluid flow additional-energy loss, its interface is connected with universal standardization digital flow instrument with the universal standardization signal transducer, can realize the automatic sensing of fluid flow signal in the pipeline is detected output and traffic figure shows, have simple in structure non-maintaining with can reduce characteristics such as construction costs.
2. background technology
According to Data acquisition, research and retrieval, at present, known pipeline flow is measured sensing mode can be divided into following a few class substantially, and below classification is discussed.
The first kind, common rotary wind type or helical vane type water meter uniform flow type flow measurement device are shown in accompanying drawing 11 and accompanying drawing 12.
Shown in Figure 11 is we huge numbers of families common water meters used in everyday, and inside is a mechanical count mechanism that is made up of plastic gear; Device shown in Figure 12, be actually amplification to measurement device function shown in Figure 11, be mainly used in the measurement of larger caliber pipeline flow, it is to overlap axis a propeller sensing mechanism is installed on the position, axis of large diameter pipeline, the propeller sensing mechanism is subjected to the effect of fluid in the pipeline earlier during work, flow rate of fluid is converted to the rotating speed of propeller sensing mechanism, be delivered to outside the pipe by the rotating speed of worm-and-wheel gear again the propeller sensing mechanism, then, outside pipe, utilize measurement device flow shown in Figure 11 again.
Second class, turbine or eddy currents uniform flow type flow measurement device, shown in accompanying drawing 10 and accompanying drawing 6, the measuring principle of its measuring principle and above-mentioned accompanying drawing 12 shown devices is essentially identical respectively.
Shown in the accompanying drawing 10 is turbo flow meter, and what overlap the axis installation on the position, axis of its tangible pipeline also is a propeller sensing mechanism, and primary instrument mainly is a tally function; Vortex shedding flow meter shown in the accompanying drawing 6, be on the position, axis of pipeline, to overlap that axis is installed or a propeller sensing mechanism in fact, only here be that this propeller sensing mechanism is installed in the thin-walled tubule; the thin-walled tubule mainly plays stationary flow, and primary instrument is still tally function.
More than two class flow velocity type flow measurement sensing devices, the uniform and stable degree of the streamline of its measuring principle convection cell requires high, the straight length that certain-length (3～5 times of calibers) will be arranged before and after the claimed apparatus installation site usually, uniform and stable with the streamline that keeps fluid, articulation or expansion bend pipe fitting adapted also will be arranged, otherwise dismounting inconvenience is changed in maintenance.Because it has rotating mechanism, so their structure all has certain complicacy, be in rotation status for a long time because of critical piece again, easy to wear, regular calibration, maintenance load are big, and the foreign material in the fluid easily twine runner and cause bigger measuring error, another main shortcoming, be to measure additional pipeline energy loss height, waste energy, generally only be applicable to the metering when pipe network allows energy dissipating with stream is terminal.
The 3rd class is a V coning tower tray amount sensing device, as shown in Figure 8.
Fig. 8 is that this device of V coning tower tray amount sensing device is to overlap axis a V awl sensing mechanism is installed on the position, axis of large diameter pipeline, the conical surface of V awl is as fluoran stream surface, experience the variation of flow rate of fluid pressure when the conical surface changes, and this variable signal passed to outside the pipe, measure by primary instrument, reach the purpose of fluid flow in the measuring channel with this; This type of device, the uniform and stable degree of the streamline of its measuring principle convection cell requires also higher, the straight length of certain-length (3～5 times of calibers) also will be arranged before and after the claimed apparatus installation site usually, uniform and stable with the streamline that keeps fluid, articulation or expansion bend pipe fitting adapted also will be arranged, otherwise dismounting inconvenience is changed in maintenance, this type of is compared with two classes of front, just has or not the difference of rotating mechanism, so, their main shortcoming all is a flow measurement additional pipeline energy loss height, wastes energy.
The 4th class is an orifice-plate type differential flow sensing device, as shown in Figure 13.
Accompanying drawing 13 is dress orifice-plate type differential flow sensing devices in the board-like pipeline of a kind of banjo clip, when fluid is through the aperture in the middle of the orifice plate in the pipeline, because of the fluid self characteristics, its flow velocity can increase automatically, pressure can reduce automatically, this device is exactly to utilize this characteristics, by the pressure in the measurement aperture and the pressure difference value of orifice plate outer tube internal pressure, then, come the measuring channel flow by mathematical model and electronic digitalizing or mechanical type primary instrument again, in this mathematical model, the computing of need extracting square root to the differential pressure value of measuring acquisition; Also require to have the straight length of certain-length (3～5 times of calibers) before and after this type of device installation site, uniform and stable with the streamline that keeps fluid, articulation or expansion bend pipe fitting adapted also will be arranged, otherwise dismounting inconvenience is changed in maintenance.Its main shortcoming is a flow measurement additional pipeline energy loss extra-high-speed, and in all existing flow measurement sensing modes, the fluid energy loss of this orifice plate is maximum, the serious waste energy, be not suitable for very much on heavy caliber large flow pipe road, using, range of application is very limited, in the current epoch of advocating energy-saving low-carbon, should eliminate this type of measuring apparatus.Use this device, just be equivalent on pipeline, load onto a gate of opening very for a short time, stopped the normal circulation of pipeline; Except that dress orifice plate in this, the complicated ring-like orifice plate flow sensor of a kind of volume macrostructure is also arranged, its measuring principle and interior dress orifice plate are roughly the same, also be to require to install at straight length, but flow measurement additional pipeline energy loss are less.
The 5th class is tubular type or inserted electromagnet flow sensing device, and ultimate principle as shown in Figure 5.
Because the pipe exterior loop of tubular type electromagnetic flow transducer device is very big, the cost height, so, developed again afterwards as shown in Figure 7 be the inserted electromagnet flow sensing device, principle is identical with tubular type, only coil has been made on the rod, and then this excellent insertion will be measured in the pipe of flow, though this mode cost decrease, still, because the Distribution of Magnetic Field uniformity coefficient is not as tubular type, measuring accuracy is also not as tubular type.
But no matter be tubular type or inserted electromagnet flow meter, coil winding is all complicated, and maintenance technology acquires a certain degree of difficulty.On the other hand,, often all there are interference of electromagnetic field measuring error in such environment such as motor and high-and low-voltage circuit also bigger, and influence irregularly, very big uncertainty is arranged at the scenes such as pump house of application traffic meter.
The 6th class is the ultrasonic flow sensing device, as shown in Figure 9.
Accompanying drawing 9 is that its primary instrument of ultrasonic flow sensing device has two electrodes, two electrodes are stuck on a certain diametrical position of pipeline outer wall during application, an electrode is the ultrasonic emitting utmost point, another electrode is the ultrasound wave receiving pole, to measure in advance in the mathematical model of parameters such as caliber, pipeline wall thickness and pipe material input instrument and calculate usefulness automatically for instrument, this equipment also is furnished with a thicknessmeter and is exclusively used in the measuring channel wall thickness, this type of flow measurement device has mobile and fixed two kinds, do not have the additional pipeline of measurement energy loss, portable use is also more convenient.But, the main shortcoming of this device is that technical pattern complexity, cost are too high, in use, its ultrasound wave generation and anti-power supply interference performances such as receiving trap and signal electron amplifying circuit thereof are poor, especially be installed in the on-the-spot fixed apparatus that uses city's AC power, disturbed by power supply, the situation that measuring error is bigger is particularly serious.
All there is a common ground in the flow sensing mechanism of above-mentioned the 5th class electromagnetic flow transducer device and the 6th class ultrasonic flow sensing device, promptly before and after the installation site, all require the straight length of certain-length (3～5 times of calibers), uniform and stable with the streamline that keeps fluid, tubular type electromagnetic flow transducer device also will have articulation or expansion bend pipe fitting adapted, otherwise dismounting inconvenience is changed in maintenance; On the other hand, elementary induction output signal is very faint, especially ultrasonic flow meter is more weak, often just in the microvolt level, require very high to amplifying circuit and working power, be very easy to be subjected to the interference from power supply, influence the stability and the metering accuracy of equipment work, verification and maintenance cost are very high.
In above explanation to the prior art background, the main literature data of reference is as follows.
(1) 2010 2 phases of " energy-conservation and environmental protection " magazine, opens the flowmeter product information of moral flow instrument company limited.
(2) " water pump and pump works " Chinese architecture publishing house, Hunan University ginger is prosperous volume.
(3) " orifice flowmeter " Shanghai instrument and meter for automation factory product information.
(4) " ultrasonic flow meter " Benxi, Liaoning wireless device factory product information.
3. utility model content
By above to existing flow measurement sensing device know-why and specificity analysis as can be known, measure in the sensing technology method at existing pipeline flow, possess simultaneously have simple in structure non-maintaining substantially, straight length before and after the installation site is not had specific (special) requirements, through-flow smooth and easy, do not have to measure additional pipeline energy loss, energy-saving efficiency height, elementary sensing output signal is strong and can save pipe fitting, reduce characteristics such as construction costs the pipeline flow sense measuring device really be few in number.
In line with energy savings, make the best use of everything, simple in structure, reliable operation again can long-lived principle, measures defective and not enough purpose in the sensing technology method in order to reach to remedy and overcome existing pipeline flow, has designed the technical solution of the utility model.
The purpose of this utility model, provide a kind of novel pipeline flow sensor, the sensing of experiencing by convection current piping bend loss fluid momentum impulse force, can not only reach the purpose of measuring channel fluid flow, and have simple in structure non-maintaining, through-flow smooth and easy, do not have to measure flow additional pipeline energy loss energy-saving efficiency high and save pipe fitting and can reduce characteristics such as construction costs.
The purpose of this utility model is to realize like this.
The technical scheme that its technical matters that solves the utility model adopts is: make housing with footpath following current three-way pipe together, manage blue cover plate in its bifurcated straight length outlet, axial in footpath following current three-way pipe straight length, two sections hollow penetrating bodies of cylindrical flow sensing curved surface water conservancy diversion that are connected as a single entity with stainless steel bolt of a branch are set, its disk end has a positioning and guiding axle, on the cover board in the eccentric orfice of sensor installation joint, by screwed connection the thrust transmission axle sleeve that two sections of branches are processed into is installed, then, on flange plate, entangle the thrust that connects in this hole and transmit axle sleeve, with screwed connection upper sensor joint, again cylindrical flow sensing curved surface baffle positioning and guiding axle being applied mechanically bolt with installation thrust transmitter shaft on the cover board is connected, and add a compression spring at the coupling bolt top that thrust is transmitted axle sleeve, like this, when fluid passes through bend pipe, the momentum that enters the bend pipe inner fluid will produce an axial thrust to cylindrical flow sensing curved surface baffle automatically, the compressible above-mentioned spring of this thrust, make thrust transmit axle sleeve one end and hold out against the positive pressure side of standard deviation pressure sensor, thereby, differential pressure pick-up just can be experienced the pressure that fluid momentum produces, and reaches the purpose of monitoring fluid flow with this.
The beneficial effects of the utility model are: fully effectively utilized the axial force acting of fluid when the change of pipeline turnaround section flows to, experience the flow of sensing measurement by fluid, easily the pipeline fluid flow is changed into the convenient mechanical pressure that connects measurement with universal standard differential pressure pick-up interface, further, by differential pressure pick-up this mechanical pressure is converted to universal standard analog voltage signal to be measured again, after this standard analog voltage signal enters the standardized digital flow totalizer meter, just pipeline flow can be changed into the flow information data.This device can be according to international pipe fitting specification standards, make the production of the utility model embodiment product, install and debugging, use standardization, product seriation, because it has the mounting structure of standard bend pipe tools, add the measuring principle characteristic that this device self possesses, make it before and after the installation site, need not to be provided with the requirement of straight length and articulation or expansion bend, it is still accurate to measure, dismounting is convenient especially, experiencing sensing measurement by in the process of fluid flow, there is not the wearing terrain of rotation, there is not the additional pipeline of measurement energy loss, simple in structure, substantially non-maintaining, manufacturing expense is also low, selects this device in engineering construction for use, can save pipe fitting and reduce construction costs, also can use energy-conservation for long-time running in the future, save the utilization cost.
4. description of drawings
Fig. 1 is that present embodiment has flow to pass through in pipeline, the sectional structural map when fluid is in flow state.
Fig. 2 is that present embodiment no flow in pipeline passes through the sectional structural map when fluid remains static.
Among Fig. 2 and Fig. 1,1. make housing, 2. cylindrical flow sensing curved surface baffle with footpath following current three-way pipe, 3. suction flange, 4. discharge flange, 5. thrust is transmitted axle sleeve, 6. sensor connector, 7. differential pressure pick-up, 8. differential pressure pick-up back pressure connecting pipe, 9. flange plate, 10. compression spring, 11. coupling bolts, 12. flow sensing valve curved surface baffle positioning and guiding axles, but 13. teletransmission differential flow signal wire, 14. pressure equilibrium return ports.
Fig. 3 is a profile diagrammatic sketch of the present utility model, also as Figure of abstract.
Fig. 4 is the sensor web member and the secondary instrument diagrammatic sketch of the utility model device;
Fig. 5 is existing electromagnetic flow transducer device diagrammatic sketch;
Fig. 6 is existing vortex shedding flow meter sensing device diagrammatic sketch;
Fig. 7 is existing inserted electromagnet flow sensing device;
Fig. 8 is existing V coning tower tray amount sensing device;
Fig. 9 is that existing its primary instrument of ultrasonic flow sensing device has two electrodes;
Figure 10 be existing be the turbo flow meter sensing device;
Figure 11 is the water meter of existing common measurement of discharge;
Figure 12 is the big caliber measurement of discharge of an existing turbine sensing water meter;
Figure 13 is a dress orifice-plate type differential flow sensing device in the board-like pipeline of a kind of existing banjo clip;
Figure 14 is that the utility model device axis becomes positive acute angle with level, the calculation diagram of mathematical model when going out to install on advancing under the fluid;
Figure 15 is that the utility model device axis becomes positive an angle of 90 degrees with level, the calculation diagram of mathematical model when going out to install on advancing under the fluid;
Figure 16 is that the utility model device axis becomes to bear acute angle with level, the calculation diagram of mathematical model when going out to install under fluid is enterprising;
The calculation diagram of mathematical model when Figure 17 is the installation of the utility model device axis horizontal;
Figure 18 is the synoptic diagram of the utility model embodiment when the pump house rig-site utilization.
5. embodiment
In the engineering practical application, though in different occasions as required, pipeline has the different angles of turning round, but the bend pipe tools with 90 degree is most widely used, so it is the application of embodiment that the utility model first-selection is spent the pipeline that turns round with 90, realizes above-mentioned the technical program.
Be described further below in conjunction with accompanying drawing 2 and 3 couples of the utility model embodiment of accompanying drawing.
When this device practiced, being installed in needed in the pipe network to be provided with on the position of 90 degree channel bend pipe fittings, can replace a standard 90 degree bend pipe tools on the pipeline.This device case is one, and its shape and structure needs only accompanying drawing 3, accompanying drawing 2 and accompanying drawing 1 at a glance with footpath following current three-way pipe, and can figure out it is the thing of what face shaping.
Same footpath following current three-way pipe with 90 degree pipeline angle of turn functions, come down to by one the 90 accurate swan neck of scale and a pipe fitting that combines with its isometric substantially same diameter straight length, this is with three end faces of footpath following current three-way pipe, be same specification bore standard size ring flange, present embodiment has only added cover plate on its divergent ends straight tube mouth ring flange, the basic size of its 90 degree bent tube section is universal standard swan neck size, to make things convenient for this device when practicing, to be connected with pipe network pipeline, that is to say, actual installation structure length when the present embodiment device is used, be the mounting structure length of a standard bend pipe tools, this device can replace finishing the function of a standard bend pipe tools fully.
Accompanying drawing 2 and accompanying drawing 1 have all been expressed the detailed structure of present embodiment device, the relative position and the interconnected relationship of each parts.This device is mainly by footpath following current three-way pipe together, flanged (FLGD) cover plate, the cylindrical flow sensing curved surface baffle of axial zone positioning and guiding axle in the following current three-way pipe straight tube, thrust transmission axle sleeve and sensor connector assemble and form, cylindrical flow sensing curved surface baffle in this device, being one is made by proportion pollution-free clean environment-friendly engineering plastics between 0.9～1.0, the hollow penetrating body that divides two sections to be connected as a single entity with stainless steel bolt, it withstands installation thrust on the cover board and transmits axle sleeve in device, like this, flow into the momentum of this device inner fluid from import, axial thrust to cylindrical flow sensing curved surface baffle generation, just can transmit axle sleeve and be delivered to the sensor connector place by thrust, at this, with universal standard differential pressure pick-up it is measured, sensing enters bend pipe inner fluid momentum in the axial impulse force size of cylindrical flow sensing curved surface baffle, and comes the size of fluid flow in the sensing measurement pipeline with this.
Owing to adopted such scheme, therefore, this device of making loses little energy-conservation and save pipe fitting and can reduce characteristics such as construction costs with regard to having the additional conduits of energy of non-maintaining substantially, through-flow smooth and easy, flow measurement simple in structure, below in conjunction with accompanying drawing 2 and accompanying drawing 1, the utility model is described in further detail.
When Fig. 2 and the utility model device busy shown in Figure 1, thrust is transmitted axle sleeve and is directly contacted the positive pressure side of standard deviation pressure sensor, differential pressure pick-up back pressure end is communicated with pressure equilibrium return port on the cover plate by metal hose, hydraulic pressure that so just can balanced differences pressure sensor two ends.At the scene during practical application, the differential pressure pick-up output signal is connected with the standard digital flow totalizer meter, like this, the data that the differential pressure pick-up output signal is measured just just in time are the axial impulse forces that enters the momentum generation of bend pipe inner fluid, have measured the size of this impulse force, then, by the mathematical model formula of setting up with the fluid momentum equation, by the standard digital flow totalizer meter, can go out pipeline flow again by the automatic detection computations of instrument.
In Fig. 2 and the utility model device shown in Figure 1, cylindrical flow sensing curved surface baffle, because of it is to make with the pollution-free clean environment-friendly engineering plastic material of the little density of proportion between 0.9～1.0, so, its buoyancy in the fluid of measured flux must be slightly larger than or equal its gravity, on the other hand, movably cylindrical flow sensing curved surface baffle parts in the bend pipe, in assembling process, must debug by counterweight, the mutual balance of buoyancy when it is worked in bend pipe and gravity is offset, and do not influence measurement result, therefore, but the utility model device is any direction or angle installation in use, all can not influence measurement accuracy, but, during arbitrarily angled installation, must measure the angle value of the installation angle between flow sensing curved surface baffle axis direction and the gravity perpendicular line, and in the mathematical model formula with this data input stream amount integrating meter, otherwise, will produce measuring error, this is because when measuring flow, must consider the influence of the gravity convection body momentum impulse force of fluid.
In Fig. 2 and the utility model device shown in Figure 1, cylindrical flow sensing curved surface baffle, at first, with regard to its body and work characteristics, under the effect that enters the bend pipe inner fluid, it is axially only doing a small amount of moving, to this, as long as contrast the different of Fig. 2 and Fig. 1, just can check on; Secondly, the curved surface fluoran stream surface of cylindrical flow sensing curved surface baffle, its axis projection that moves be one just round.During the work of the utility model device, the curved surface fluoran stream surface of cylindrical flow sensing curved surface baffle, it must be the part of formation standard bend pipe tools outboard tube inwall, at this moment, flow channels space in the bend pipe, fluid space is crossed in the inside that is obstacle bend pipe tools in the nothing that very is near the mark, so, during the work of the utility model device, not only played the effect of common standard elbow, and compare with existing flow sensor, through-flow accessible, there is not the flow of measurement additional pipeline energy loss, the energy-saving efficiency height, this also is that the present embodiment device is compared with aforesaid several existing flow measurement sensing devices, why has the key point of obvious energy-saving effect.
Fig. 2 and the utility model device shown in Figure 1, measure flow because be by the momentum of experiencing fluid, so be referred to as " DL type pipeline flow sensing device " at this, DL is the abbreviation of " momentum " the two word Chinese phonetic alphabet, if this device is developed further into supporting flowmeter product, then can called after " DL-XXX type flowmeter ", at this, pipe diameter specification when XXX practices for the utility model device, for example " DL-200 type flowmeter ", the pipe laying latus rectum of promptly representing this flowmeter is DN200.
Fig. 4 is the universal standard accessory diagrammatic sketch that present embodiment is selected for use when using on the spot at the scene.
In Fig. 4,1. universal standard differential pressure pick-up; 2. be with articulation universal standard metal hose; 3. universal standardization digital flow integrating meter.
These three parts such as the digital flow integrating meter that present embodiment is selected for use in actual applications, differential pressure pick-up and back pressure connecting pipe accessory; be the prior art finished product; these three parts all can be purchased on the dynamo-electric market of five metals, do not belong to patent protection scope of the present utility model.
The finished product of universal standard differential pressure pick-up has pressure differential from Pa to KPa and the series of products of different measuring scope such as MPa and accuracy class, when practical application, can select for use according to the size and the accuracy requirement of measuring flow.The output signal of universal standard differential pressure pick-up is the international standard simulating signal of 0～5V or 4～20mA, can directly be connected with the universal standardization digital flow integrating meter of standard analog signal input interface.
Universal standardization digital flow integrating meter is built-in with the calculated with mathematical model program and the parameter input method of microcomputer chip and curing, on-the-spot use and data by the network teletransmission all easily flexibly.
Sensor and back pressure connecting pipe accessory are to connect the DN15 flange-connection stainless steel metal flexible pipe of usefulness in general hot-water heating hardware store with regard to commercially available pot-type boiler, the first-class class of shower, and it is anticorrosive, flexibility, pressure-bearing and durability etc. all can satisfy request for utilization.
Figure 18 is the synoptic diagram of the utility model embodiment when the pump house rig-site utilization.
6. measuring principle and mathematical model
Below flow measurement principle and flow rate calculation mathematical model concisely to introduce the utility model device.
In the engineering practical application, in different pipe network equipment system occasions, as required, pipeline has different angle and the calibers of turning round to change, below a generalized case, bend pipe as shown in Figure 14 are discussed earlier.If the tubular axis center line of pipeline is positioned on the xOz vertical plane, the angle of turn of pipeline is α, and two ends flow section area is respectively A
1And A
2, mean velocity in section is respectively V
1With V
2, be Q by the flow of pipeline, fluid gravity is G in the turning pipeline, now analyzes fluid in the bend pipe to the acting force of tube wall, during relevant later analysis that Here it is, the axial thrust that will measure with differential pressure pick-up among the utility model embodiment that we will mention.
Because in the present embodiment, selected is equal-diameter elbow, so, can establish A at this
1=A
2=A, V
1=V
2=V, again because, the cylindrical flow sensing curved surface baffle in the present embodiment is to be fully immersed in the fluid when moving axially, it is in the fluid environment of an equipressure, so, can not consider that tube fluid pressure influences it; On the other hand, because the design of this programme, its buoyancy and gravity are balanced each other, so, just can not consider the stressing influence when buoyancy and gravity move axially cylindrical flow sensing curved surface baffle,, press the generalized case shown in the accompanying drawing 14 according to above condition, use the equation of momentum according to fluid mechanics, just can derive the computing formula of axial reasoning size when entering the bend pipe inner fluid cylindrical flow sensing curved surface baffle being moved axially.Now establish this reasoning size and be P
1, with the reacting force of its opposite sign but equal magnitude be Frz, promptly
Frz＝-P
1
To the situation shown in the accompanying drawing 14, Frz=(β ρ Q
2/ A)-G COS (α), α＜90 °
To the situation shown in the accompanying drawing 15, Frz=(β ρ Q
2/ A)-G COS (0 °), α=0 °
To the situation shown in the accompanying drawing 16, Frz=(β ρ Q
2/ A)-and G COS (α), 90 °＜α＜180 °
To the situation shown in the accompanying drawing 17, Frz=(β ρ Q
2/ A)-G COS (90 °)=β ρ Q
2/ A, α=90 °
Above formula can get the computing formula of outflow Q through deriving, because the pressure of positive pressure side of differential pressure pick-up and back pressure end equates, i.e. and P=P
2So the differential pressure that differential pressure pick-up records is P
1, P
1Size just equal Frz, so, to the situation shown in the accompanying drawing 17, following meter formula is just arranged:
P
1＝βρQ
2/A
Q＝(AP/βρ)
1/2
Flow measurement computational mathematics model formation during accompanying drawing 18 embodiment applicable cases that Here it is.
ρ is the density of fluid in above formula, unit K g/m
3, the m of flow Q unit
3/ s, the m of caliber unit, tube section amasss m
2, fluid gravitational unit KN, Frz and P
1Unit K N, β is the fluid momentum correction factor, determines by actual measurement when the sensing device flow calibration.
7. conclusion
In sum, utilizing the utility model device development flowmeter product measuring channel flow, is that prior art useful replenished and perfect.
Claims (4)
1.DL type pipeline flow sensing device, by same footpath following current three-way pipe housing, flange plate, the cylindrical flow sensing curved surface baffle of axial zone positioning and guiding axle in the following current three-way pipe straight tube, thrust is transmitted axle sleeve, compression spring and sensor connector assemble and form, it is characterized in that: cylindrical flow sensing curved surface baffle positioning and guiding axle is connected with the thrust transmission axle sleeve bolt of installing on the cover board, when having fluid to pass through bend pipe, the momentum that enters the bend pipe inner fluid produces axial thrust to cylindrical flow sensing curved surface baffle, with length of spring compressed, make thrust transmit axle sleeve one end and hold out against the impression measurement of standard deviation pressure sensor joint.
2. DL type pipeline flow sensing device according to claim 1, it is characterized in that: when having fluid to pass through bend pipe, thrust is transmitted axle sleeve one end and is directly contacted the positive pressure side of standard deviation pressure sensor, differential pressure pick-up back pressure end is communicated with pressure equilibrium return port on the cover plate by metal hose, with the pressure at balanced differences pressure sensor two ends, the differential pressure pick-up output signal is connected with the standardized digital flow totalizer meter.
3. DL type pipeline flow sensing device according to claim 1, it is characterized in that: cylindrical flow sensing curved surface baffle, be that its buoyancy must be slightly larger than or equal its gravity in the fluid of measured flow with proportion hollow penetrating body that pollution-free clean environment-friendly engineering plastics are made between 0.9～1.0, that divide two sections to be connected as a single entity with stainless steel bolt.
4. DL type pipeline flow sensing device according to claim 1, it is characterized in that: cylindrical flow sensing curved surface baffle has a circle ring surface fluoran stream surface, during this device work, under the effect that enters the bend pipe inner fluid, cylindrical flow sensing curved surface baffle is only done a small amount of location by compression spring and is moved axially, the circle ring surface fluoran stream surface its axis projection that moves be one just round, and, this curved surface fluoran stream surface is the part of standard bend pipe tools outboard tube inwall, flow channels space in this device bend pipe is that fluid space is crossed in the inside of obstacle bend pipe tools in the nothing that very is near the mark.
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| CN2010205928979U CN202066532U (en) | 2010-10-21 | 2010-10-21 | DL-shaped pipeline flow sensing device |
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|---|---|---|---|
| CN2010205928979U CN202066532U (en) | 2010-10-21 | 2010-10-21 | DL-shaped pipeline flow sensing device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102518905A (en) * | 2011-12-14 | 2012-06-27 | 合肥通用机械研究院 | Blind plate with sensing unit and intelligent electronic tag and management system thereof |
| CN109854850A (en) * | 2019-01-17 | 2019-06-07 | 江阴中南重工有限公司 | Duct survey flanged fitting |
| CN113922297A (en) * | 2021-09-29 | 2022-01-11 | 中国一冶集团有限公司 | Combined elbow device with adjustable slot angle and construction method |
| CN114623034A (en) * | 2020-12-14 | 2022-06-14 | 宜善电机工业有限公司 | Torque-increasing flow guide structure of coaxial water flow starter |
-
2010
- 2010-10-21 CN CN2010205928979U patent/CN202066532U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102518905A (en) * | 2011-12-14 | 2012-06-27 | 合肥通用机械研究院 | Blind plate with sensing unit and intelligent electronic tag and management system thereof |
| CN109854850A (en) * | 2019-01-17 | 2019-06-07 | 江阴中南重工有限公司 | Duct survey flanged fitting |
| CN114623034A (en) * | 2020-12-14 | 2022-06-14 | 宜善电机工业有限公司 | Torque-increasing flow guide structure of coaxial water flow starter |
| CN113922297A (en) * | 2021-09-29 | 2022-01-11 | 中国一冶集团有限公司 | Combined elbow device with adjustable slot angle and construction method |
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