CN201145593Y

CN201145593Y - Multi-larynx type hole plate

Info

Publication number: CN201145593Y
Application number: CNU2007200323323U
Authority: CN
Inventors: 刘建华; 江寿南; 陈于飞
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-07-24
Filing date: 2007-07-24
Publication date: 2008-11-05
Anticipated expiration: 2017-07-24

Abstract

The utility model relates to a differential pressure type flow measurement throttling device, in particular to a multi-throttle orifice plate used for various media such as liquid and gas, which is suitable for flow measurement under the conditions of low permanent pressure loss, severe assembly position and inadequate straight tube section. The multi-throttle orifice plate comprises a clamping flange piece 1, a multi-throttle orifice plate body piece 2, a sealing element 3, and a round multi-throttle orifice plate 4, a rectangular multi-throttle orifice plate 5, an irregular abnormal multi-throttle orifice plate 6 and a composite multi-throttle orifice plate 7 with extra-large caliber size. Openings of a pressure tapping nozzle are arranged on a front and rear D position and a front and rear 0.5D position of the straight tube section (as seen in an attached figure of a specification), and taps the pressure at a subangle and the front and rear D position and the front and rear 0.5D position of the straight tube section. The positive pressure and the negative pressure are tapped so as to conveniently obtain the differential pressure value and calculate the flow rate. Due to the design of symmetry of a plurality of holes, the multi-throttle orifice plate reduces the formation of the shearing force of turbulent flows and vortex flows, reduces the kinetic energy loss and has the pressure loss which is only one third of that of the orifice plate. The multi-throttle orifice plate belongs to an energy-saving instrument.

Description

Many larynxs profiled orifice plate

One, technical field:

The utility model relates to a kind of differential pressure type flow measurement restriction device, especially relates to a kind of many larynxs profiled orifice plate that is used for the low various media of various liquid (as: liquid coolant, oil, aqueous medium), gas (as: flue gas, steam, air, blast furnace gas) and Reynolds number.

Two, background technology:

The present flow measurement differential pressure producer of widely used all kinds of media in industry measurement, its restricting element mostly is standard orifice plate.Standard orifice plate is to utilize fluid to cause differential pressure to record a kind of differential pressure flowmeter of flow by discoideus hollow bluff body.Its cored slab of standard orifice plate is fixed in measuring tube central shaft position, and its great advantage is to belong to the GB series products, and measuring accuracy is higher, need not to demarcate.But, thereby cause the energy consumption of system to strengthen because its resistance causes the permanent pressure loss big greatly.Also because its sharp edge is worn and torn easily, make its efflux coefficient shakiness, thereby measuring accuracy is affected, influence is used.

Three, utility model content:

The utility model provides a kind of many larynxs profiled orifice plate in order to solve the weak point in the above-mentioned background technology.It is a kind of novel throttling device of on the standard orifice plate basis, developing.It is except that the advantage with low cost of manufacture, easy for installation, high all standard orifice plates of measuring accuracy, and its biggest advantage is: crushing is little, wear-resisting, is difficult for incrustation, and has the function that can survey gas-liquid two-phase and survey bidirectional flow.Also shortened flow development length simultaneously, its service condition is unrestricted.

For achieving the above object, its special character of the technical solution adopted in the utility model is: standard orifice plate has only a fluid flow aperture, and the design of many larynxs profiled orifice plate has more than more than one aperture, its sensor is that the disk of a porous is installed on the cross section of pipeline by the flange clamping, when fluid passes the disk of porous, fluid will be by rectification, and eddy current is minimized, and forms the flow field of approximate ideal.By the standard pressure obtaning device, can obtain stable differential pressure signal, on the basis of experimental test data, sum up and revise out unique computing formula, calculate volumetric flow rate, mass rate according to Bernoulli equation at last.Thereby make it have the dual-use function of fluid throttling pressure and flow field shaping.

The total area that is designed to aperture of the quantity in its hole and size and the area ratio of main aperture should be between 2/3 to 3/7, the quantity of its aperture and the size in each hole and arrangement form, according to the operating mode difference different designs is arranged, and also can be designed to circle, rectangle or irregular odd-shaped cross section according to the caliber of different geometries, also can be designed to the combined type that especially big caliber is used.

Its mounting means is identical with standard orifice plate, clamps on the point position that is installed in tested pipeline with two flanges to get final product.

Compared with prior art, the utlity model has advantage and effect is as follows:

1, because the design of porous makes it have the function that stream field carries out rectification, thereby reduced eddy current, vibration and signal noise, improved flowing field stability greatly, the linearity is improved greatly, during 5: 1 range ratios, the linearity can reach ± and 0.3%; During 7: 1 range ratios, the linearity can reach ± and 0.5%;

2, the utility model is difficult at the throttling position producing incrustation, has reduced the wearing and tearing of measurement additive error and sharp edge, has guaranteed the stable of efflux coefficient, and efflux coefficient changes less than 1%.Thereby improved measuring accuracy.

3, permanent pressure loss is little: because the design of porous symmetry and do not have sharp edge, reduced the formation of turbulent shear power and eddy current, reduced the loss of kinetic energy, under same measurement operating mode, the permanent compression loss is 1/2 of a standard orifice plate, thereby having saved the energy greatly, is a kind of energy-saving instrument.

4, dirty being difficult for that bear dirty stops up: as mentioned above because of having reduced the formation of turbulent shear power and eddy current, greatly reduce the appearance of being detained the dead band, thereby guarantee that dirty medium can pass through a plurality of holes smoothly, has reduced the blocked chance of opening.

5, owing to reduced crushing, its combination can be used for the flow measurement of especially big caliber.

Four, description of drawings:

Below in conjunction with accompanying drawing the utility model is further specified.

Fig. 1 is an assembly drawing of the present utility model, comprises two clamping flanges (1) and many larynxs orifice plate (2).

Fig. 2 is the circular piece (4) of the many larynxs orifice plate among Fig. 1.

Fig. 3 is the rectangular-shaped piece (5) of the many larynxs orifice plate among Fig. 1.

Fig. 4 is irregular many larynxs of abnormity orifice plate spare (6) of the many larynxs orifice plate among Fig. 1.

Fig. 5 is many larynxs of the combined type orifice plate spare (7) among Fig. 1.

Five, embodiment:

Among the embodiment, two clamping flanges (1) clamp many larynxs orifice plate (2) in Fig. 1, and with sealing gasket (3) joint face are sealed, and flange (1) also is provided with positive and negative pressure port, pressure mouth.Position of opening is the corner connection pressure.Obtain differential pressure value by malleation, the negative pressure of taking out, thereby calculate the purpose that flow reaches flow measurement, the principle of its measurement of discharge is identical with differential pressure flowmeter.

Many larynxs orifice plate body comprises the orifice plate body of 4 kinds of different geometric configuratioies, can select according to different operating modes, that is: the orifice plate of the many larynxs among Fig. 2 circular piece (4); Many larynxs of rectangle orifice plate (5); , irregular many larynxs of abnormity orifice plate (6): many larynxs of combined type orifice plate (7).

Claims

1, a kind of orifice plate of waiting is characterized in that having the hole more than more than one more on orifice plate, and by two flange clampings.