CN209416416U - A kind of differential pressure type vortex precession flowmeter - Google Patents

Abstract

The utility model discloses a kind of differential pressure type vortex precession flowmeters, including draft tube, differential pressure pick-up and metal hose layer, the draft tube is by throat section, isometrical section and expansion segment composition, described isometrical section there are two pressure sensing holes for setting at the position of expansion segment, the line of centres of two pressure sensing holes be in same draft tube cross section it is same diametrically, two pressure sensing holes are connect with upper connecting pipe and lower connecting pipe respectively, the upper impulse pipeline and lower impulse pipeline are connect with differential pressure pick-up, the differential pressure pick-up is connected with precession frequency detection circuit, the upper impulse pipeline is connected by blowback branch pipe with blowback general pipeline with lower impulse pipeline, the throat section of the draft tube is internally provided with pipe cyclone blade, the through-flow inside pipe wall is provided with smooth glass layer, the smooth glass layer inner wall is bonded with temperature measuring probe.The utility model is bonded on through-flow inside pipe wall by smooth glass layer, smooth glass layer with a thickness of 5 millimeters, can be good at reduce fluid resistance.

Description

A kind of differential pressure type vortex precession flowmeter

Technical field

The utility model relates to flowmeter technology field, specially a kind of differential pressure type vortex precession flowmeter.

Background technique

Vortex precession flowmeter is widely used in petroleum, chemical industry, metallurgy and urban construction, for measuring gas, liquid and steaming The flow of vapour.

Temperature-sensitive can be used in the vortex precession frequency of vortex precession flowmeter, strain, piezoelectricity, capacitor, a variety of different sides such as optical fiber Method is detected.It wherein, is the detection method passed through the most so far using piezoelectric detection.

The piezoelectric element that this prior art uses is sensitive to various external force, and the mechanical oscillation of pipeline and fluid will make piezoelectricity Probe generates noise signal, even if using double piezoelectric probe differential detections, can not completely eliminate mechanical vibration noise, this Influence of the mechanical vibration noise to primary flow signal is particularly acute, and causes the small flow signal-to-noise ratio of piezoelectric detection formula vortex precession flowmeter When being deteriorated, and detecting, impulse pipeline is easy bending and knots, to influence the measurement of the equipment.

Utility model content

The purpose of this utility model is to provide a kind of differential pressure type vortex precession flowmeters, it is intended to improve impulse pipeline and be easy bending It knots and signal-to-noise ratio compromises.

The utility model is realized in this way:

A kind of differential pressure type vortex precession flowmeter, including draft tube, differential pressure pick-up and metal hose layer, the draft tube is by larynx Section, isometrical section and expansion segment composition, described isometrical section there are two pressure sensing hole, two pressure-sensitive for setting at the position of expansion segment The line of centres in hole be in same draft tube cross section it is same diametrically, two pressure sensing holes respectively with upper connecting pipe and lower pilot Pipe connection, the threaded tube of the upper end of the upper connecting pipe are connected with the screwed pipe head thread of upper impulse pipeline, the lower pilot Threaded tube on pipe is connected with the screwed pipe head thread on lower impulse pipeline, the upper impulse pipeline and lower impulse pipeline and poor Pressure sensor connection, the differential pressure pick-up are connected with precession frequency detection circuit, the upper impulse pipeline and lower impulse pipeline It is connected by blowback branch pipe with blowback general pipeline, the throat section of the draft tube is internally provided with pipe cyclone blade, the draft tube Inner wall is provided with smooth glass layer, and the smooth glass layer inner wall is bonded with temperature measuring probe.

Further, the smooth glass layer is bonded on through-flow inside pipe wall, the smooth glass layer with a thickness of 5 milli Rice.

Further, the blowback general pipeline is connected with blowback branch pipe by triple valve, is equipped with hand on the blowback branch pipe Dynamic valve.

Further, the temperature measuring probe is PT100 temperature measuring probe, and the temperature measuring probe and temperature are aobvious Show that device connects.

Further, the upper impulse pipeline and lower impulse pipeline are made of rubber layer and metal hose layer, the gold Belong to hose layer to be bonded on rubber layer inner wall.

Compared with prior art, the utility model has the beneficial effects that

(1), the utility model is bonded on through-flow inside pipe wall by smooth glass layer, smooth glass layer with a thickness of 5 milli Rice can be good at the resistance for reducing fluid.

(2), it is connected with blowback branch pipe by triple valve by blowback general pipeline, hand-operated valve, blowback is installed on blowback branch pipe High pressure gas is passed through in general pipeline, to dredge well to each pipeline.

It (3), is PT100 temperature measuring probe by temperature measuring probe, temperature measuring probe is connected with temperature indicator, It can be good at measuring the temperature of fluid.

(4), it is made of upper impulse pipeline and lower impulse pipeline rubber layer and metal hose layer, metal hose layer is viscous It connects on rubber layer inner wall, can be good at that impulse pipeline and lower impulse pipeline is avoided to bend making for the influence equipment that knots With, and the signal-to-noise ratio of the equipment is higher, can be realized not stop and replaces differential pressure pick-up.

Detailed description of the invention

It, below will be to required in embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment The attached drawing used is briefly described, it should be understood that the following drawings illustrates only some embodiments of the utility model, therefore not It should be considered as the restriction to range, for those of ordinary skill in the art, without creative efforts, It can also be obtained according to these attached drawings other relevant attached drawings.

Fig. 1 is a kind of differential pressure type vortex precession flowmeter main view of the utility model first embodiment；

Fig. 2 is a kind of cross-sectional view of differential pressure type vortex precession flowmeter shown in FIG. 1.

In figure: 1, throat section；2, draft tube；3, isometrical section；4, upper connecting pipe；5, threaded tube；6, upper impulse pipeline；7, Hand-operated valve；8, blowback branch pipe；9, blowback general pipeline；10, precession frequency detection circuit；11, differential pressure pick-up；12, lower impulse pipeline； 13, expansion segment；14, lower connecting pipe；15, metal hose layer；16, temperature measuring probe；17, smooth glass layer；18, pipe cyclone leaf Piece.

Specific embodiment

It is practical below in conjunction with this to keep the purposes, technical schemes and advantages of the utility model embodiment clearer The technical solution in the utility model embodiment is clearly and completely described in attached drawing in novel embodiment, shows So, described embodiment is a part of embodiment of the utility model, rather than whole embodiments.It is practical based on this Embodiment in novel, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment is fallen within the protection scope of the utility model.Therefore, the implementation to the utility model provided in the accompanying drawings below The detailed description of mode is not intended to limit the range of claimed invention, but is merely representative of the utility model Selected embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making creative labor Every other embodiment obtained under the premise of dynamic, fall within the protection scope of the utility model.

Embodiment 1, a kind of shown referring to Figures 1 and 2, differential pressure type vortex precession flowmeter, including draft tube 2, differential pressure pick-up 11 and metal hose layer 15, draft tube 2 be made of throat section 1, isometrical section 3 and expansion segment 13, isometrical section 3 close to expansion segment 13 Setting is there are two pressure sensing hole at position, the line of centres of two pressure sensing holes be in same 2 cross section of draft tube it is same diametrically, Two pressure sensing holes are connect with upper connecting pipe 4 and lower connecting pipe 14 respectively, the threaded tube 5 and upper impulse of the upper end of upper connecting pipe 4 The screwed pipe head thread of pipeline 6 connects, the screwed pipe head thread on threaded tube 5 and lower impulse pipeline 12 on lower connecting pipe 14 Connection, upper impulse pipeline 6 and lower impulse pipeline 12 are connect with differential pressure pick-up 11, differential pressure pick-up 11 and precession frequency detection electricity Road 10 connects, and upper impulse pipeline 6 and lower impulse pipeline 12 pass through blowback branch pipe 8 and the connection of blowback general pipeline 9, the throat of draft tube 2 Section 1 is internally provided with pipe cyclone blade 18, and 2 inner wall of draft tube is provided with smooth glass layer 17,17 inner wall of smooth glass layer bonding There is temperature measuring probe 16, in use, fluid enters inside draft tube 2, the sliding glassy layer 17 of streamer can be good at reduction pair The resistance that fluid generates, fluid are entered in upper impulse pipeline 6 and lower impulse pipeline 12 by upper connecting pipe 4 and lower connecting pipe 14 Portion, the fluid in upper impulse pipeline 6 and lower impulse pipeline 12 enter differential pressure pick-up 11 and measure, and differential pressure pick-up 11 is Full scale 100KPa exports the both-end isolated form differential pressure pick-up of 60mV, can show under different flow different when differential pressure signal wave Shape, to judge the flow of fluid well, upper impulse pipeline 6 and lower impulse pipeline 12 are by rubber layer and 15 groups of metal hose layer At relatively traditional rubber tube can be avoided bending and knot, when appearance upper impulse pipeline 6, lower impulse pipeline 12, upper connecting pipe 4 When with occurring a blocking in the pipeline in lower connecting pipe 14, it is passed through high pressure gas into blowback general pipeline 9, to carry out well Conducting, temperature measuring probe 16 can be good at measuring water temperature.

Referring to shown in Fig. 2, smooth glass layer 17 is bonded on 2 inner wall of draft tube, smooth glass layer 17 with a thickness of 5 millis Rice can be good at the resistance for reducing fluid.

Shown in referring to Fig.1, blowback general pipeline 9 is connected with blowback branch pipe 8 by triple valve, is equipped on blowback branch pipe 8 manually Valve 7 is passed through high pressure gas in blowback general pipeline 9, to dredge well to each pipeline.

Shown in referring to Fig.1, temperature measuring probe 16 is PT100 temperature measuring probe, and temperature measuring probe 16 and temperature are aobvious Show that device connects, it is enough that the temperature of fluid is measured well.

Shown in referring to Fig.1, upper impulse pipeline 6 and lower impulse pipeline 12 are made of rubber layer and metal hose layer 15, gold Belong to hose layer 15 to be bonded on rubber layer inner wall, can be good at that impulse pipeline and the 6 lower bendings of impulse pipeline 12 is avoided to knot The use of the equipment is influenced, and the signal-to-noise ratio of the equipment is higher, can be realized not stop and replace differential pressure pick-up.

The working principle of the utility model is: streamer slides 17 energy of glassy layer in use, fluid enters inside draft tube 2 Enough to reduce the resistance generated to fluid well, fluid enters upper 6 He of impulse pipeline by upper connecting pipe 4 and lower connecting pipe 14 Inside lower impulse pipeline 12, the fluid in upper impulse pipeline 6 and lower impulse pipeline 12 enters differential pressure pick-up 11 and measures, Differential pressure pick-up 11 is the both-end isolated form differential pressure pick-up that full scale 100KPa exports 60mV, can show difference under different flow When differential pressure signal waveform, to judge the flow of fluid well, upper impulse pipeline 6 and lower impulse pipeline 12 are by rubber layer and gold Belong to hose layer 15 to form, relatively traditional rubber tube can be avoided bending and knot, when appearance upper impulse pipeline 6, lower impulse pipeline 12, when occurring a blocking in the pipeline in upper connecting pipe 4 and lower connecting pipe 14, it is passed through high pressure gas into blowback general pipeline 9, from And be connected well, temperature measuring probe 16 can be good at measuring water temperature.

Above description is merely a prefered embodiment of the utility model, is not intended to limit the utility model, for For those skilled in the art, various modifications and changes may be made to the present invention.All spirit and original in the utility model Within then, any modification, equivalent replacement, improvement and so on be should be included within the scope of protection of this utility model.

Claims (5)

1. a kind of differential pressure type vortex precession flowmeter, including draft tube (2), differential pressure pick-up (11) and metal hose layer (15), special Sign is: the draft tube (2) is made of throat section (1), isometrical section (3) and expansion segment (13), and isometrical section (3) are close to expansion Opening setting at the position of section (13), there are two pressure sensing holes, the line of centres of two pressure sensing holes to be in same draft tube (2) cross section It is same diametrically two pressure sensing holes are connect with upper connecting pipe (4) and lower connecting pipe (14) respectively, the upper connecting pipe (4) The threaded tube (5) of upper end is connected with the screwed pipe head thread of upper impulse pipeline (6), the screwed pipe on the lower connecting pipe (14) Set (5) is connected with the screwed pipe head thread on lower impulse pipeline (12), the upper impulse pipeline (6) and lower impulse pipeline (12) and Differential pressure pick-up (11) connection, the differential pressure pick-up (11) and precession frequency detection circuit (10) connection, the upper pressure guiding pipe Line (6) and lower impulse pipeline (12) pass through blowback branch pipe (8) and blowback general pipeline (9) connection, the throat section of the draft tube (2) (1) it is internally provided with pipe cyclone blade (18), draft tube (2) inner wall is provided with smooth glass layer (17), the smooth glass Glass layer (17) inner wall is bonded with temperature measuring probe (16).

2. a kind of differential pressure type vortex precession flowmeter according to claim 1, which is characterized in that the smooth glass layer (17) is viscous Connect on draft tube (2) inner wall, the smooth glass layer (17) with a thickness of 5 millimeters.

3. a kind of differential pressure type vortex precession flowmeter according to claim 1, which is characterized in that the blowback general pipeline (9) and anti- It blows branch pipe (8) to connect by triple valve, hand-operated valve (7) is installed on the blowback branch pipe (8).

4. a kind of differential pressure type vortex precession flowmeter according to claim 1, which is characterized in that the temperature measuring probe (16) For PT100 temperature measuring probe, the temperature measuring probe (16) connects with temperature indicator.

5. a kind of differential pressure type vortex precession flowmeter according to claim 1, which is characterized in that the upper impulse pipeline (6) and Lower impulse pipeline (12) is made of rubber layer and metal hose layer (15), and the metal hose layer (15) is bonded in rubber layer On wall.