CN2689185Y

CN2689185Y - Round target pore plates

Info

Publication number: CN2689185Y
Application number: CN 03262662
Authority: CN
Inventors: 刘建华; 陈于飞
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-08-25
Filing date: 2003-08-25
Publication date: 2005-03-30
Anticipated expiration: 2013-08-25

Abstract

The utility model relates to a different voltage-typed flow measurement throttling device, in particular to a round target pore plate used for various liquid, gas and various smudged dielectrics with low Reynolds number. The utility model is suitable for the flow measurement of the medium with low Reynolds number in the service pipe under adverse conditions. The structure of the utility model comprises a round circular-shaped core body (5), a housing pin (4) which is guaranteed to be centered, a key bar (7) which is enchased in the body of the round circular-shaped core body and a circular pore plate (8) to form a basal body component. The basal body component is fixed on a measured tube by a couple of press flanges (2), (3). The utility model also comprises a voltage taking mouth component (1) and a component (6). The opening position of the voltage taking mouth is in the front and back D and 0.5 D position of the straight pipe segment (see accompanying diagram). The kinetic pressure and the static pressure are taken to acquire the values of differential pressure and calculate the flow capacity. The structure of the utility model is simple in that the circular pore plate is fixed in the axle center position of the measured tube instead of being welded on the measured tube. The loading and unloading are very convenient. The pore plate can be disassembled, changed or repaired.

Description

Round target formula orifice plate

Technical field

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

Background technology

The present widely used flow measurement differential pressure producer that is used to measure low reynolds number and dirty class medium in industry measurement, its restricting element is " annular orifice " type structure or " segmental orifice plate " type structure, and annular orifice is to utilize fluid to cause differential pressure to record a kind of differential pressure flowmeter of flow by discoideus solid bluff body.Annular orifice central layer in fact is fixed in measuring tube central shaft position, though comparing with general standard orifice plate, it more is difficult for incrustation, and solved because the sharp edge wearing and tearing cause the efflux coefficient instability, make the problem of measuring accuracy reduction and concentricity, but it installs difficulty, need install the cylinder that is used for fixing orifice plate additional and weld gusset or the like, can not dismantle and change, its service condition is restricted.Segmental orifice plate is then because its efflux coefficient shakiness is affected measuring accuracy, thereby influence is used.

Summary of the invention

The utility model provides a kind of round target formula orifice plate in order to solve the weak point in the above-mentioned background technology, and it is a kind of novel throttling device of developing on the basis of annular orifice and segmental orifice plate.It removes has with one heart, wear-resisting, is difficult for incrustation, and outside the advantage of high all annular orifices of measuring accuracy and segmental orifice plate, its biggest advantage is: delicate structure, easy for installation, do not need any weldment of being used to install, and can dismantle easily, change and keep in repair.Also shortened flow development length simultaneously, its service condition is unrestricted.

For achieving the above object, the technical solution adopted in the utility model is a kind of round target formula orifice plate of design, it is characterized in that: its base member is by annular core body (5), forcing screw (4), be embedded in the key bar (7) and the annular orifice (8) in week in the annulus core body and connect and compose, base member is fixed on the tested pipeline by a pair of supported flange (2), (3), and preceding pressure mouth (1) position of opening is at 0.5D place on the previous pipe D distance of straight length, behind the pipe of back pressure mouth (5) position of opening at straight length.

Three keyways are arranged on the described annular core body (5), annular core body (5) is fixed in the ring flange (2), (3) of a pair of male and fomale(M﹠F).

Be with cancavo-convex 3 key bars (7) on the described annular core body (5).

Described forcing screw (4) is the centering screw.

Round target formula orifice plate then by an annular core body and three retainingf keys and fixedly dormant screw form, it has the flange of male and fomale(M﹠F) to clamp the round target formula orifice plate that assembles by a pair of.

Above-mentioned three retainingf key one ends block annular orifice one end and are blocked by the annular core body, use the fixedly fastening centering of dormant screw again, make it to be combined into an element body.Again it is stuck in and promptly becomes the round target formula orifice plate that a cover does not need any welding, automatic centering in the groove of flange.

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

1, modern design, compact conformation, exquisiteness are compared with segmental orifice plate with general throttling element such as annular orifice, convenient for installation and maintenance, delicate structure, easy for installation does not need any weldment that is used to install, can dismantle easily, change and keep in repair, greatly reduce product cost and erected cost.

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.Also shortened flow development length simultaneously, its service condition is unrestricted.

3, the D that opens at straight length of pressure port, the D/2 place takes the span ways of measure pressure.

4, the utility model can be measured the dirty medium of various low reynolds numbers, has enlarged usable range.Be particularly suitable for petrochemical industry, the flow measurement of low reynolds number medium fluid.

Description of drawings

Fig. 1 is a structural drawing of the present utility model;

Fig. 2 is an annular core body side view;

Fig. 3 is an annular core body front elevation.

Among the figure: 1, preceding pressure mouth; 2, flange; 3, flange; 4, annular core body; 5, back pressure mouth; 6, tested pipeline; 7, forcing screw; 8, key bar; 9, annular orifice.

Embodiment

As shown in Figure 1: it comprises preceding pressure mouth 1, a pair of supported

flange

2 and 3, annular core body 4, back pressure mouth 5, and tested pipeline 6. front and back pressure mouth position of opening are got dynamic pressure, static pressure at preceding D, the 0.5D place, back of straight length, calculate flow so that obtain differential pressure value.

Fig. 2 is an annular core body side view; Fig. 3 is an annular core body front elevation.

Fig. 2 and Fig. 3 are the detail drawings of annular core component and orifice plate among Fig. 1, it comprises annulus core body 4, guarantee the forcing screw 7 of centering, be embedded in three the key bars 8 and the annular orifice 9 in week form a base member together, this base member is fixed in a pair of supported flange that shows among Fig. 1, becomes a cover round target formula orifice plate.During real work, the principle of its measurement of discharge is identical with differential pressure flowmeter, is the D on the straight length before and after orifice plate, and D/2 gets the position dynamic and static pressure.Be converted into flow according to its differential pressure value.Realize the purpose of flow measurement.

Claims

1, round target formula orifice plate, it is characterized in that: its base member is by annular core body (5), forcing screw (4), be embedded in the key bar (7) and the annular orifice (8) in week in the annulus core body and connect and compose, base member is fixed on the tested pipeline by a pair of supported flange (2), (3), and preceding pressure mouth (1) position of opening is at 0.5D place on the previous pipe D distance of straight length, behind the pipe of back pressure mouth (5) position of opening at straight length.

2, round target formula orifice plate according to claim 1 is characterized in that: three keyways are arranged on the annular core body (5), annular core body (5) is fixed in the ring flange (2), (3) of a pair of male and fomale(M﹠F).

3, round target formula orifice plate according to claim 1 is characterized in that: be with cancavo-convex 3 key bars (7) on the annular core body (5).

4, round target formula orifice plate according to claim 1, it is characterized in that: forcing screw (4) is the centering screw.