CN201392216Y - Energy-saving differential pressure flowmeter - Google Patents

Abstract

An energy-saving differential pressure flowmeter comprises a throttle, and is characterized in that the throttle is a disk type throttle, a plurality of holes are distributed on the disk of the disk type throttle, and two sides of the disk type throttle are also provided with a pressure-measuring hole and a pressure-measuring tube. The utility model not only is applicable to the flow measurement of media such as ordinary gas, liquid and steam, but also has a good effect on low-pressure and dirty media, and the utility model is characterized by little pressure loss, wear resistance, dirt resistance, high differential pressure value, energy saving and little maintenance.

Description

A kind of energy-saving differential pressure flowmeter

Technical field

The utility model relates to a kind of differential pressure flowmeter, particularly relates to a kind of have degree of precision, energy-conservation, the low energy-saving differential pressure flowmeter of safeguarding, is to the improvement of existing standard orifice plate differential pressure flowmeter structure, belongs to the differential pressure type flow measurement technology.

Background technology

Differential pressure flowmeter is the most widely used flowmeter of a class, and its use amount is occupied the first place in all kinds of flow instruments.The differential pressure flowmeter range of application is extensive especially, and various objects all have application in the flow measurement of closed conduct, as the fluid aspect: single-phase, mixed phase, cleaning, dirty, drag flow etc.; Duty aspect: normal pressure, high pressure, vacuum, normal temperature, high temperature, low temperature etc.; The caliber aspect: from several mm to several m; Flox condition aspect: subsonic speed, velocity of sound, pulsating flow etc.Differential pressure flowmeter accounts for 1/4～1/3 of the whole consumptions of flowmeter at the consumption of each industrial sector.In recent years, because the appearance of various new flowmeter, the use amount percentage of differential pressure flowmeter descends gradually, is a most important class flowmeter but still do not lose at present.The shortcoming of existing differential pressure flowmeter is:

(1) measuring accuracy is generally on the low side;

(2) measurement range is narrow, generally only 3: 1～4: 1;

(3) on-the-spot mounting condition is required height;

(4) crushing big (finger-hole plate, nozzle etc.).

Existing differential pressure flowmeter is generally by restriction device, differential pressure transmitter and integrating instrument three parts are formed. and restriction device commonly used has standard orifice plate, nozzle, Venturi tube, wedge shape flowmeter etc., this type of restriction device differential pressure value height, but crushing is big, the usually stifled guiding tube of dirty medium.Verabar has newly appearred recent years, the Tuo Ba pipe, the V awl waits the novel throttling device, and the pressure loss reduces greatly, but dirty medium is still had no idea, during installation straight length is required high, low flow rates of fluid because of the differential pressure value of the little generation of throttling is very little, is made and measures instability, and precision is not high. and existing standard orifice plate flowmeter is owing to have only an opening, can cause very big permanent compression loss, because a large amount of eddy current in orifice plate both sides has consumed pressure potential wherein; And at random and mix the formed noise of eddy current, cause measure linear degree and repeatability to reduce; It is very slow that orifice pressure recovers, and causing need very long straight length.

The utility model content

The purpose of this utility model is to overcome the prior art above shortcomings, and the energy-saving differential pressure flowmeter that a kind of crushing is little, can measure low pressure and dirty medium is provided.This energy-saving differential pressure flowmeter removes and is applicable to gas, liquid, outside rate-of flows such as steam are measured, low pressure and dirty medium there is good result equally, have that crushing is little, wear-resistant, the dirt that bears dirty, differential pressure value height, energy-conservation, the low characteristics of safeguarding, measure broad quantum, the resistance that dams is little, processing and fabricating precision height.

The technical scheme that the utility model provides is: this energy-saving differential pressure flowmeter, include a restriction device, be characterized in that described restriction device is the collar plate shape restriction device, the a plurality of apertures of distribution on the disk of described collar plate shape restriction device, described collar plate shape restriction device both sides also are provided with pressure port and the pressure guiding pipe that links to each other with pressure obtaning device.

Certainly, the restriction device of this energy-saving differential pressure flowmeter that the utility model provides both can be a collar plate shape, also can be square or other satisfactory shape.The size in the aperture on the described disk and branch Bouyei actual needs are designed.The ways of measure pressure that the utility model provides has ring casing pressure, flange pressure etc., and is fully identical with standard orifice plate, meets country or international relevant criterion.Be connected the regulation that meets GB/T2624-2006 between described pressure guiding pipe and the collar plate shape restriction device, belong to prior art.

For better finishing the purpose of this utility model, described collar plate shape restriction device is the left-right symmetric structure.

For better finishing the purpose of this utility model, the material on the described collar plate shape restriction device can be stainless, or other material of choosing by on-the-spot technological requirement.

For better finishing the purpose of this utility model, can be communicated with between the aperture that distributes on the described collar plate shape restriction device.

For better finishing the purpose of this utility model, the shape in aperture can be circle, grooved, rectangle etc. on the described restriction device.

For better finishing the purpose of this utility model, can multilayer distribute on the described restriction device, also can arrange distribution more, maybe can become radial distribution etc.,

In technique scheme, pressure port setting subsidiary on the described restriction device meets the regulation of GB/T2624-2006, or meets the regulation relevant with differential-pressure instrumentation that country formulates.

In technique scheme, other structure of NM differential pressure flowmeter is same as the prior art.

Principle of work of the present utility model is: when fluid flows through ducted porous restriction device, fluid will being balanced, eddy current is minimized, form the approximate ideal fluid, by the standard pressure obtaning device, stable differential pressure signal be can obtain, volumetric flow rate, mass rate calculated according to Bernoulli equation.Because the variation of area of passage before and after restriction device, has produced certain pressure reduction, reads differential pressure information, flow velocity is directly proportional with the square root of the differential pressure that produces by change pipeline circulation area, thereby can draw pipeline flow.

Compared with prior art, the beneficial effects of the utility model are: remove and be applicable to common gases, liquid is outside rate-of flows such as steam are measured, low pressure and dirty medium there are good result equally, have that crushing is little, wear-resistant, a dirt that bears dirty, differential pressure value height, energy-conservation, the low characteristics of safeguarding.

Description of drawings

Fig. 1 provides the structural representation of embodiment for the utility model;

Fig. 2 is the structural representation of the collar plate shape restriction device in the porous restriction device.

Embodiment

As Fig. 1～shown in Figure 2, this energy-saving differential pressure flowmeter, include a collar plate shape restriction device 1, a distribution measuring hole 2 and a row measured hole 3 on the disk of described collar plate shape restriction device 1, the aperture of collar plate shape restriction device 1 is precision machined according to the strict process standard, the size in hole and distribution are according to the size in aperture and divide Bouyei's actual needs designed, be the key factor that reliability and accuracy are measured in decision, described collar plate shape restriction device 1 both sides also are provided with pressure port and the pressure guiding pipe that links to each other with pressure obtaning device.

Mark among the figure: 4. flange, 5. conduit, 6. before ring casing, 7. back ring casing, 8. bolt, 9. nut, 10. pad.

During use, collar plate shape restriction device 1 of the present utility model is installed in the pipeline, the same standard orifice plate of installation requirement, when fluid flows through ducted collar plate shape restriction device 1, because the existence of collar plate shape restriction device 1, make flow section that variation take place, measured hole 2 and measured hole 3 make fluid shrink by the distribution of throttling element open-cellular form, play the effect of rectifier simultaneously, the symmetric(al) flow quantity sensor can provide the kinetic energy and the potential energy of symmetry by the porous arrangement flow field of design, and flowing field stability improves greatly, the linearity is promoted than conventional throttle device, reduce turbulent shear power significantly, fluid rheology stress forms with relevant eddy current.Even small differential pressure is also very stable, owing to, produced certain pressure reduction, read differential pressure information in collar plate shape restriction device 1 front and back, the funtcional relationship of root a tree name differential pressure and flow, thus draw pipeline flow.

Can be according to the needs of measured flux range in the practical application, the demand of the throttling element pressure loss, adjust the utility model version, such as the form of measured hole, quantity, distribution etc.The same with throttling devices such as orifice plates, working temperature, pressure depend on the material and the grade of pipeline and flange;

Because measured hole 2 and measured hole 3, disperse stressedly, be not afraid of wearing and tearing, there is not acute angle, no acute angle wearing and tearing, its β value can remain unchanged for a long time, and whole instrument does not have movable member, so need not to repeat demarcation, and long-time stability are good, long service life.The measured hole stream field carries out the balance rectification, has reduced eddy current, vibration and signal noise, and flowing field stability improves greatly,

The utility model has identical using method and profile with orifice plate, therefore can directly replace standard orifice plate, without any need for the variation of pipe arrangement and the change of correlate meter, and for measured hole 2 and measured hole 3, can be according to the situation setting of measured medium, thus significantly reduce the chance that allows dirty medium stop up.

Claims (1)

1. energy-saving differential pressure flowmeter, include a restriction device, it is characterized in that described restriction device is the collar plate shape restriction device, the a plurality of apertures of distribution on the disk of described collar plate shape restriction device, described collar plate shape restriction device both sides also are provided with pressure port and the pressure guiding pipe that links to each other with pressure obtaning device.

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