CN208704809U - A kind of novel tapered flowmeter - Google Patents

Abstract

The utility model provides a kind of novel tapered flowmeter, including external shell and throttling set, and perforation is provided with cavity in shell, and throttling set is fixedly installed in the cavity；Throttling set includes L shape sealing pipeline, cone and support frame；L shape sealing pipeline includes vertical duct and horizontal pipeline, and hollow and integrated molding inside vertical duct and horizontal pipeline, the free end of vertical duct is fixedly connected with inner walls；Horizontal pipeline is fixedly connected with support frame, and support frame is fixed on the inner wall of external shell, and horizontal pipeline is equipped with cone；Cone and cavity are set on same central axes, and horizontal pipeline is equipped with pressure port, and pressure port is located at the downstream of cone；One end of shell is equipped with positive pressure tappings and negative pressure tappings in parallel, and pressure difference transmitter is equipped between positive pressure tappings and negative pressure mouth, and the utility model has stable structure, and measurement is accurate, and has many advantages, such as good reproducibility.

Description

A kind of novel tapered flowmeter

Technical field

The utility model relates to fluid measurement technologies, mainly propose a kind of Cone Flowmeter.

Background technique

Differential pressure flowmeter is a kind of with a long history, maximum flowmeter of dosage, take throttling set as the differential pressure type of detection Flowmeter is wherein most widely used a kind of flowmeter.Its working principle is that: when fluid flows through throttling element, the transformation of part static energy For kinetic energy, pressure difference is generated, in conjunction with known fluid condition, pipeline condition, using Bernoulli's theorem and flowing continuity equation as base Present principles, to acquire flow.Compared to relatively at present industrially apply with the flowmeters such as orifice plate, Venturi tube, Cone Flowmeter Mainly have the advantages that front and back flow development length requirement is low, crushing is small, precision is high, outflow system is stable.

V bevel-type flowmeter uses single armed suspension type structure in tradition, not can guarantee concentric co-axial structure, fluid flows through the knot Discontinuity equalization when structure, when measuring, there are resonance problems.Moreover, the negative pressuren zone of acquisition negative pressure signal is located at facies cerebellaris pyramidis Turbulent flow in, acquisition signal fluctuated, and then influence measurement accuracy.

Summary of the invention

Problem to be solved in the utility model is to provide stress equalization when a kind of fluid flows through the structure, and measurement is accurate, and Novel tapered flowmeter with good reproducibility.

In order to solve the above technical problems, the technical solution adopted in the utility model is: including external shell and throttling set, Perforation is provided with cavity in the shell, and the throttling set fixed setting is in the cavity；The throttling set includes L shape Sealing pipeline, cone and support frame；The L shape sealing pipeline includes vertical duct and horizontal pipeline, the vertical duct and institute It states hollow inside horizontal pipeline and is integrally formed, the free end of the vertical duct is fixedly connected with the inner walls, institute It states horizontal pipeline to be fixedly connected with support frame as described above, support frame as described above is fixed on the inner wall of the external shell, the transverse direction Pipeline is equipped with the cone；The cone and the cavity are set on same central axes, and the horizontal pipeline is equipped with pressure Hole, the pressure port are located at the downstream of the cone；One end of the shell is equipped with positive pressure tappings and negative pressure tappings in parallel, described Pressure difference transmitter is equipped between positive pressure tappings and the negative pressure mouth.

Further, nameplate frame is additionally provided on the shell.

Further, the shell both ends are additionally provided with pressure flange.

Further, hanging hole is additionally provided on the shell, the hanging hole is respectively arranged in two pressure flanges Side.

Further, the preceding taper of the cone is a, and the range of a is 50 ° -60 °.

Further, the rear taper of affiliated cone is b, and the range of the b is 130 ° -140 °.

Compared with prior art, the utility model has the advantages and positive effects of:

1. the novel tapered flowmeter that the utility model is proposed has accuracy rate high, repeatability is high, and measurement range is big, Ask straight pipe very short, not easy to wear, crushing is small, be suitable for various dirty fluids, low hydrostatic fluid flow measurement the advantages that.

2. the utility model increases the stability of throttling set by extension supporting frame, throttling set can effectively ensure that Concentric co-axial structure solves resonance problems caused by discontinuity equalization when fluid flows through the structure.Also it effectively prevents throttling When device is shaken strongly since fluid high-speed impacts cone or fluid, stream is effectively guaranteed in caused cone position variation The stability and precision of meter.By extending L shape ambient, so that pressure port is positioned exactly at small swirl center, increase measurement Precision.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the utility model

Fig. 2 is the cut-away view of the utility model structure

Fig. 3 is the structural schematic diagram of the flange of the utility model

Fig. 4 is the principles of the present invention figure

In figure: external shell -1, throttling set -2, cavity -3, L shape sealing pipeline -4, cone -5, support frame -6, vertically Pipeline -7, horizontal pipeline -8, pressure port -9, pressure difference transmitter -10, positive pressure tappings -11, negative pressure tappings -12, nameplate frame -13 take Pressure flange -14, hanging hole -15,100- high velocity central, 200- low-pressure area.

Specific embodiment

In order to better understand the utility model, the utility model is carried out into one with attached drawing combined with specific embodiments below The description of step.

As Figure 1-Figure 4, a kind of novel tapered flowmeter, including external shell 1 and throttling set 2, in the shell 1 Perforation is provided with cavity 3, and the throttling set 2 is fixed in the cavity 3；The throttling set 2 includes L shape seal pipe Road 4, cone 5 and support frame 6；The L shape sealing pipeline 4 includes vertical duct 7 and horizontal pipeline 8, the vertical duct 7 and institute It states hollow inside horizontal pipeline 8 and is integrally formed, the free end of the vertical duct 7 is fixedly connected with 1 inner wall of shell； The horizontal pipeline 8 is fixedly connected with support frame as described above 6, and support frame as described above 6 is fixed on and 1 inner wall of shell, the support Frame 6 increases the stability of the throttling set 2, can effectively ensure that the concentric co-axial structure of the throttling set 2, it is therefore prevented that When the throttling set 2 is shaken strongly since fluid high-speed impacts cone or fluid, caused 5 change in location of cone, The horizontal pipeline 8 is equipped with the cone 5；The cone 5 and 3 concentric co-axial of cavity, the horizontal pipeline 8 are equipped with Pressure port 9 is to carry out pressure by negative pressure tappings, the pressure port 9 is located at for introducing pressure in L shape sealing pipeline 4 The downstream of the cone 5；One end of the shell 1 is equipped with positive pressure tappings 11 and negative pressure tappings 12, the positive pressure tappings 11 in parallel It is equipped with pressure difference transmitter 10 between the negative pressure tappings 12, the pressure difference of two pressure tappings is directly measured simultaneously by pressure difference transmitter It is output to external equipment.

Further, pressure difference transmitter used is the PX274-01DI pressure difference transmitter of U.S. Omega.

Further, the external shell 1 is additionally provided with nameplate frame 13, hanging hole 15, pressure flange 14, the hanging hole 15 It is respectively arranged on two 14 insides of pressure flange, the fixation for flowmeter.

Further, taper a is 50 ° -60 ° before the cone 5, and rear taper b is 130 ° -140 °, and fluid is in impact cone When will form boundary-layer, the dynamics of washing away can be slowed down, it is constant to guarantee that the discharge coefficient of Cone Flowmeter maintains a long-term stability.

Further, the pressure port 9 is located at the center of the small whirlpool of low-pressure area after the cone 5, improves measurement Precision.4 inner sealing of L shape sealing pipeline prevents fluid from entering the transmitting for influencing signal.

The course of work of the utility model is as follows:

When fluid flows into flowmeter, the pressure sensor for the positive pressure tappings held in the pre taper obtains the pressure value of fluid, When fluid flows through taper throttling set, cone gradually tapers up fluid axisymmetrically towards inside pipe wall, forms gradual ring dress It shrinks.Fluid is also gradually accelerated while circulation area is shunk.Due to enabling it to more have in cone in the duct mandrel line The high velocity central for acting on VELOCITY DISTRIBUTION of effect, and the space between cone gabarit and inside pipe wall is unobstructed.It is boring The downstream of body forms the high turbulent flow of a high speed, the low-pressure area containing small whirlpool.These small whirlpools will form high frequency at pressure port Pressure fluctuation signal by a narrow margin, this fluctuating signal are detected by the pressure sensor of the pressure port after cone and are passed to negative pressure tappings In its pressure sensor.It brings two pressure values into Bernoulli equation to be calculated, can obtain the flow of fluid.

When the utility model flows through throttling element by fluid, part static energy is changed into kinetic energy, pressure difference is generated, in conjunction with known Fluid condition, pipeline condition, using Bernoulli's theorem and flowing continuity equation as basic principle, to acquire flow.It has There is accuracy rate high, repeatability is high, and measurement range is big, it is desirable that straight pipe is very short, not easy to wear, and crushing is small, is suitable for various dirty The advantages that fluid, low hydrostatic fluid flow measurement.

The embodiments of the present invention are described in detail above, but the content is only the preferable of the utility model Embodiment should not be considered as limiting the scope of the present invention.It is all to become according to equalization made by the scope of the utility model Change and improve etc., it shall still fall within the scope of this patent.

Claims (6)

1. a kind of novel tapered flowmeter, it is characterised in that: including external shell (1) and throttling set (2), the shell (1) Interior perforation is provided with cavity (3), and the throttling set (2) is fixed in the cavity (3)；Throttling set (2) packet Include L shape sealing pipeline (4), cone (5) and support frame (6)；The L shape sealing pipeline (4) includes vertical duct (7) and transverse pipe Road (8), the vertical duct (7) and the horizontal pipeline (8) are internal hollow and are integrally formed, the vertical duct (7) Free end is fixedly connected with the shell (1) inner wall；The horizontal pipeline (8) is fixedly connected with support frame as described above (6), the branch Support (6) is fixed on the inner wall of the external shell (1), and the horizontal pipeline (8) is equipped with the cone (5)；The cone Body (5) and the cavity (3) are set on same central axes, and the horizontal pipeline (8) is equipped with pressure port (9), the pressure port (9) it is located at the downstream of the cone (5)；One end of the shell (1) is equipped with positive pressure tappings (11) and negative pressure tappings (12) in parallel, Pressure difference transmitter (10) are equipped between the positive pressure tappings (11) and the negative pressure tappings (12).

2. a kind of novel tapered flowmeter according to claim 1, it is characterised in that: be additionally provided with inscription on the shell (1) Card holders (13).

3. a kind of novel tapered flowmeter according to claim 1, it is characterised in that: shell (1) both ends are additionally provided with Pressure flange (14).

4. a kind of novel tapered flowmeter according to claim 1, it is characterised in that: be additionally provided on the shell (1) outstanding Hanging hole (15), the hanging hole (15) are respectively arranged on the inside of two pressure flanges (14).

5. a kind of novel tapered flowmeter according to claim 1, it is characterised in that: the preceding taper of the cone (5) is The range of a, a are 50 ° -60 °.

6. a kind of novel tapered flowmeter according to claim 1, it is characterised in that: the rear taper of affiliated cone (5) is The range of b, the b are 130 ° -140 °.