CN2560923Y - V-shape conic flow meter - Google Patents

Abstract

The utility model provides a V-shaped cone flow meter, which comprises a flange, a pressure-taking nozzle, a negative pressure-taking nozzle and a measuring tube. A V-shaped cone unit coaxial to the measuring tube is fixed in the measuring tube, consisting of a stay tube connected with a negative pressure-taking nozzle and a V-shaped cone on the measuring tube, the stay tube is communicated with the negative pressure-taking tube in the V-shaped cone. The utility model has the advantages that V-shaped cone flow meter can adjust the side of cone as per the flow, so as to ensure enough differential pressure to measure exactly the differential pressure transmitter; V-shaped cone flow meter has no dead angle, so spoils near the cone cannot be settled; the requirement on the V-shaped cone flow meter straight tube section is low, so as to reduce the pressure lose, save the assembling space, reduce the cost and make the V-shaped cone flow meter serial products with the aperture of diameter 15-3000mm.

Description

The V-type cone flow meter

Technical field

The utility model relates to a kind of surveying instrument.Be used for the V-type cone flow meter of measurement gas, liquid, steam flow especially.

Background technology

General orifice-plate type differential pressure flowmeter is widely used in the measurement of fluid flow, but required straight length is very long, and crushing is big, and when surveying dirty fluid, impurity is piled up before orifice plate, influences measuring accuracy.The used annular orifice of the board-like differential pressure flowmeter of looping pit is a plectane coaxial with pipeline, plectane is fixed on the axle of pipeline center, the two ends of axle are welded on the pipeline with tripod, have before and after the plectane to have pressure port on the tube wall, the liquid that contains solid particle is easy to pass through from the annular space of throttling element.Through improving, find that the required straight length of annular orifice can be very short, but crushing was bigger afterwards, the back pressure instability does not have fixing circular plate shape simultaneously, lack mass data, so its application is restricted.

Summary of the invention

The utility model will solve the deficiency of above-mentioned technology, and a kind of measuring accuracy height is provided, and the wide V-type cone flow meter of application.

The technical scheme that the utility model adopted provides a kind of V-type cone flow meter, mainly include flange, malleation pressure mouth, negative pressure pressure mouth, measuring tube, at the measuring tube internal fixation V-type cone assembly coaxial with it arranged, its assembly include respectively with measuring tube on the stay pipe that is connected with the V-type cone of negative pressure pressure mouth, negative pressure pressure pipe in stay pipe and the V-type cone is connected, and is provided with the bracing frame of two ends arm on the V-type cone; One cylindrical throttling edge is arranged at the maximum gauge place of V-type cone.

Described stay pipe is connected with the straight length of V-type cone, and is connected with negative pressure pressure pipe in the V-type cone.

Between described stay pipe and the V-type cone is to be connected by elbow, and is connected with negative pressure pressure pipe in the V-type cone.

The two ends arm of support frame as described above is fixed on the inwall and V-type cone of measuring tube, and the two ends arm angle of bracing frame is 120 degree.

Good effect of the present utility model: the V-type cone flow meter can be adjusted the size of cone according to the size of flow, to guarantee that producing enough pressure reduction can measure differential pressure transmitter accurately; Do not have the dead angle on the V-type cone flow meter structure, the booty near cone is not deposited; V-type cone flow meter straight length requires low, reduces the pressure loss, can save installing space simultaneously, reduces cost, and can make bore is the V-type cone flow meter series of products of Φ 15-3000mm.

Description of drawings

Fig. 1 is the utility model one example structure figure;

Fig. 2 is another example structure of the utility model figure;

Fig. 3 is (V-type awl) and (orifice plate) characteristic curve of flowmeter comparison diagram.

Embodiment

In conjunction with the embodiments the utility model is elaborated with reference to the accompanying drawings.

As shown in Figure 1, 2, the utility model is a kind of V-type cone flow meter, mainly include flange 1, malleation pressure mouth 2, negative pressure pressure mouth 2 ', measuring tube 4, at measuring tube 4 internal fixation V-type cone 3 assemblies coaxial with it are arranged, its assembly include respectively with measuring tube 4 on the stay pipe 5 of negative pressure pressure mouth 2 ' be connected with V-type cone 3, negative pressure pressure pipe 6 in stay pipe 5 and the V-type cone 3 is connected, and is provided with the bracing frame 8 of two ends arm on V-type cone 3; One cylindrical throttling edge 7 is arranged at the maximum gauge place of V-type cone 3.

Stay pipe 5 is connected with the straight length 10 of V-type cone 3, and is connected with negative pressure pressure pipe 6 in the V-type cone 3, in the V-type cone one tapered end face is arranged foremost.

Between stay pipe 5 and the V-type cone 3 is to be connected by elbow 9, and is connected with negative pressure pressure pipe 6 in the V-type cone 3.

The two ends arm of support frame as described above 8 is fixed on the inwall and V-type cone 3 of measuring tube 4, and the two ends arm angle of bracing frame 8 is 120 degree.

The V-type cone flow meter is to realize like this, as shown in Figure 1, ring flange 1 is fixed on the two ends of measuring tube 4, on measuring tube 4, have malleation pressure mouth 2 and negative pressure pressure mouth 2 ', be connected with differential pressure transmitter Δ P respectively, at measuring tube 4 internal fixation V-type cone 3 assemblies coaxial with it are arranged, its assembly include respectively with measuring tube 4 on the stay pipe 5 of negative pressure pressure mouth 2 ' be connected with V-type cone 3, stay pipe 5 is connected with the straight length 10 of V-type cone 3, and is connected with negative pressure pressure pipe 6 in the V-type cone 3; At the maximum gauge place of V-type cone 3 a cylindrical throttling edge 7 is arranged, one tapered end face is arranged foremost, thereby solved the wear problem of throttling edge in the V-type cone.Be provided with the bracing frame 8 of two ends arm on V-type cone 3, the two ends arm of bracing frame 8 is by on the inwall and V-type cone 3 that are fixedly welded on measuring tube 4, and the two ends arm angle of support 8 is 120 degree, to increase shock strength.This structure is applicable to when caliber Φ 200 is following, measures.

As shown in Figure 2, when bore is measured more than 150 greater than Φ, ring flange 1 is fixed on the two ends of measuring tube 4, on measuring tube 4, have malleation pressure mouth 2 and negative pressure pressure mouth 2 ', be connected with differential pressure transmitter Δ P respectively, at measuring tube 4 internal fixation V-type cone 3 assemblies coaxial with it being arranged, is to be connected by elbow 9 between stay pipe 5 and the V-type cone 3, and is connected with negative pressure pressure pipe 6 in the V-type cone 3; Be provided with the bracing frame 8 of two ends arm on V-type cone 3, the two ends arm of bracing frame 8 is by on the inwall and V-type cone 3 that are fixedly welded on measuring tube 4, and the two ends arm angle of support 8 is 120 degree, to increase shock strength.

As shown in Figure 3, so the V-type cone flow meter is very little owing to the stable maximum differential pressure of back pressure can obtain, the permanent compression loss is just littler.

The V-type cone flow meter is because reasonable in design, and signal stabilization is good, also has the self-cleaning function, simultaneously every V-type cone flow meter all will be according to fluid properties, expectation flow value, pipeline pressure, temperature, calculate, select the β value according to user's process conditions, $\mathrm{\β}=\sqrt{\frac{D^2-d^2}{D^2}}$

β: flow area and pipe diameter ratio, d: cone maximum outside diameter, D: flowmeter internal diameter.

Bigger β (the conelet bodily form) can make crushing diminish, and less β value (big cone-shaped) can produce bigger differential pressure, recommends maximum differential pressure 1 meter water column.

Claims (4)

1, a kind of V-type cone flow meter, mainly include flange (1), malleation pressure mouth (2), negative pressure pressure mouth (2 '), measuring tube (4), it is characterized in that V-type cone (3) assembly coaxial with it being arranged at measuring tube (4) internal fixation, its assembly include respectively with measuring tube (4) on the stay pipe (5) that is connected with V-type cone (3) of negative pressure pressure mouth (2 '), negative pressure pressure pipe (6) in stay pipe (5) and the V-type cone (3) is connected, and is provided with the bracing frame (8) of two ends arm on V-type cone (3); One cylindrical throttling edge (7) is arranged at the maximum gauge place of V-type cone (3).

2, V-type cone flow meter according to claim 1 is characterized in that stay pipe (5) is connected with the straight length (10) of V-type cone (3), and with V-type cone (3) in negative pressure pressure pipe (6) be connected.

3, V-type cone flow meter according to claim 1 is characterized in that between stay pipe (5) and the V-type cone (3) be to be connected by elbow (9), and is connected with negative pressure pressure pipe (6) in the V-type cone (3).

4, V-type cone flow meter according to claim 1 is characterized in that the two ends arm of support frame as described above (8) is fixed on the inwall and V-type cone (3) of measuring tube (4), and the two ends arm angle of bracing frame (8) is 120 degree.

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