CN202734877U

CN202734877U - Verabar flowmeter probe

Info

Publication number: CN202734877U
Application number: CN 201220459185
Authority: CN
Inventors: 马世勋
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-09-11
Filing date: 2012-09-11
Publication date: 2013-02-13
Anticipated expiration: 2022-09-11

Abstract

The utility model discloses a verabar flowmeter probe. The probe adopts an ellipse integrated double-cavity structure; the double cavities both have circular cavity structures; the head part of the probe is formed by two cross inclined planes; the probe comprises two pressure acquiring holes; and the diameters of the pressure acquiring holes are correspondingly 12mm and 18mm. The verabar flowmeter probe has the beneficial effects that a force bar uniform velocity flow probe used has the advantages that various mediums can be measured, the application range is wide, the precision is high and the measuring range ratio is large; the probe pressure acquiring holes are essentially anti-blocking; a measuring signal is stable and small in fluctuation; the permanent pressure loss of a pipeline is low; a unique high-strength ellipse single-sheet double-cavity structure is adopted; the verabar flowmeter probe is low in installation cost and generally maintenance-free, and can be installed and maintained in an online manner; and due to the excellent anti-blocking design of the verabar flowmeter probe, the defect that inserted type flow probes such as a verabar and the like are easy to block is overcome, so that the anti-blocking level of the verabar flowmeter probe achieves an unprecedented level.

Description

Power Bhujerba flowmeter probe

Technical field

The utility model relates to the flow measurement technical field, is specially a kind of power Bhujerba flowmeter probe.

Background technology

Utilizing differential pressure principle to carry out flow measurement is one of the most reliable flow measurement mode in the world today, and representative products---orifice plate has long history, people to it installation, use and overhaul all very familiar.Flow Measuring System is comprised of secondary instruments such as restriction device (differential pressure producer), differential pressure transmitter and flow integrators.

Enter the nineties advancing by leaps and bounds along with electronic technology, the variation of matter has occured in the precision of the secondary instrument such as transmitter, integrating instrument, sensitivity, reached high level, but, the detection level in a source does not have important breakthrough all the time in decades, high-caliber downstream instrument become the bottleneck of restriction differential pressure system for flow measurement development, so that can't have been given play to due high-level efficiency.

Early stage uniform speed flow probe has been ignored mobility status and the aerodynamic principle of critical fluids in Cross section Design, thus its range of application be very restricted, for example:

1, the point of flow separation of circular probe is unfixed, and its result is so that fluid coefficient K can't accurately obtain, and measuring accuracy is ± 10.0%～20.0%

2, the diamond probe has a sharp-pointed fixedly separated point, can produce very large fluid draw power, causes probe vibration and signal noise, and stronger partial vacuum occurs at the probe afterbody, so that probe low pressure pressure port is easily blocked.

So 3, the aerodynamic shape probe causes Surveying Actual Precision unreliable because scope little its convection cell angle of attack in higher-pressure region is very responsive, measuring error is greater than ± 10.0%.

The limitation of Verabar probe:

1, Verabar probe only has 3 millimeters because positive and negative pressure port is very little, contains large particle and milk in the coal gas and is easy to stop up and gets the hole and press

2, when the pressure guiding pipe leakage, probe high-pressure balancing district is destroyed, and the particle that diameter is less in the impurity just might enter pressure port.

3, when pipeline is in stopping production, because the Brownian movement of molecule, the impurity that particle is little might enter pressure port.

4, the frequent startup-shutdown of system, the moment that forms in the higher-pressure region, the impurity that particle is little might enter pressure port, accumulates over a long period, and just might cause the obstruction of probe.Contain a large amount of tar, algae bio in the medium, perhaps contain fibrous material, also might cause the obstruction of probe.

The utility model content

For addressing the above problem, the utility model has designed a kind of power Bhujerba flowmeter probe, effectively raises the precision of flow measurement in the various environment.

The technical scheme that its technical matters that solves the utility model adopts is, a kind of power Bhujerba flowmeter probe, described probe adopts oval Integral double cavity structure, two-chamber all is the circular cavity structure, the head of probe is two transversal inclined-planes, described probe comprises two pressure ports, described pressure port diameter is respectively 12 millimeters and 18 millimeters, can produce larger differential pressure value, differential pressure value than at present international any plug-in type bar class flowmeter bad student is all large, the differential pressure value that produces than present bi toba flow meter is also large 18%, this can produce aspect the coal gas measurement of measuring the low flow velocity of heavy caliber higher differential pressure value precision more the discrepancy in elevation absolute advantage is more surely arranged.

The beneficial effect that the utility model produces is, the utility model advantage that the Bhujerba uniform speed flow is popped one's head in of exerting oneself: can measure medium, have wide range of applications; Precision is high, range ratio is large; Probe pressure port essence is anti-blocking; Measuring-signal is stable, fluctuation is little; The permanent crushing of pipeline is low; Exclusive high-intensity oval monolithic double cavity structure; Erected cost is low, and is substantially non-maintaining; Can install online and overhaul; Power Bhujerba flow probe is with the anti-blocking design of its brilliance, thoroughly broken away from the plug-in type flows such as the Verabar susceptible to plugging drawback of popping one's head in, and the anti-blocking level of the Bhujerba flow probe of exerting all one's strength has reached unprecedented height.

Description of drawings

Be elaborated below in conjunction with the drawings and specific embodiments

Fig. 1 is structural front view of the present utility model

Fig. 2 is structure rear view of the present utility model

Fig. 3 is structure side view of the present utility model

Fig. 4 is structure vertical view of the present utility model

Among the figure, 1, pressure port 2, transversal inclined-plane 3, oval Integral double cavity structure

Embodiment

As shown in the figure, the utility model is a kind of power Bhujerba flowmeter probe, described probe adopts oval Integral double cavity structure 3, two-chamber all is the circular cavity structure, the head of probe is two transversal inclined-planes 2, described probe comprises two pressure ports 1, described pressure port 1 diameter is respectively 12 millimeters and 18 millimeters, can produce larger differential pressure value, differential pressure value than at present international any plug-in type bar class flowmeter bad student is all large, the differential pressure value that produces than present bi toba flow meter is also large 18%, this can produce aspect the coal gas measurement of measuring the low flow velocity of heavy caliber higher differential pressure value precision more the discrepancy in elevation absolute advantage is more surely arranged.

Principle of work of the present utility model is:

Behind the turn-on flow rate meter, fluid enters bend pipe under the duct static pressure effect, has formed very soon pressure balanced state.After pressure balance formed, fluid ran into high pressure in bend pipe inflow point, took a devious route, and no longer entered in the bend pipe, and probe high pressure pressure port can not be blocked.The front portion of probe forms the higher-pressure region, and pressure has stoped particle to enter a little more than duct static pressure, is zero in the speed of the high pressure pressure port place fluid of probe, does not have object can enter pressure port.

To pop one's head in and insert pipeline center, when the flow that is full of pipeline during through the test rod of power Bhujerba flowmeter, the pitot hole of test rod fluoran stream surface senses the total head mean value of fluid, and the baroport of the lee side of test rod senses the static pressure of fluid.Total head mean value and static pressure have definite relation with between the fluid flow that flows through, and are simulated the standard differential pressure of this point by the wind-tunnel calibration curve of this probe, come the flow value of Fluid Computation according to the standard differential pressure.

The utility model is not limited to above-mentioned embodiment, and anyone should learn the structural change of making under enlightenment of the present utility model, every with the utlity model has identical or close technical scheme, all fall within the protection domain of the present utility model.

The technology that the utility model is not described in detail, shape, structure partly are known technology.

Claims

1. a power Bhujerba flowmeter probe is characterized in that, described probe adopts oval Integral double cavity structure, and two-chamber all is the circular cavity structure, and the head of probe is two transversal inclined-planes, and described probe comprises two pressure ports.

2. power Bhujerba flowmeter probe according to claim 1 is characterized in that, described pressure port diameter is respectively 12 millimeters and 18 millimeters.