CN210321846U

CN210321846U - Nozzle flowmeter

Info

Publication number: CN210321846U
Application number: CN201921740381.1U
Authority: CN
Inventors: 韩雅男; 张华�
Original assignee: Zhangjiagang Zeyuan Machinery Manufacturing Co Ltd
Current assignee: Zhangjiagang Zeyuan Machinery Manufacturing Co Ltd
Priority date: 2019-10-17
Filing date: 2019-10-17
Publication date: 2020-04-14
Anticipated expiration: 2029-10-17

Abstract

The utility model discloses a nozzle flowmeter, including straight tube section and nozzle, the upper reaches end and the low reaches end of straight tube section are connected with upper reaches flange and low reaches flange, the nozzle is fixed in the middle part of straight tube section, the nozzle includes mouth edge and tubulose mouth, the circumference equipartition has a plurality of rectification hole in the mouth edge, the upper reaches side and the downstream side that lie in the nozzle in the straight tube section are provided with the high pressure respectively and get pressure mouth and low pressure and get the pressure mouth, the high pressure is got pressure mouth and low pressure and is got pressure mouth and fixed intercommunication respectively has high pressure to get pressure coupling and low pressure to get pressure coupling, the high pressure is got pressure coupling and is got pressure pipe and second high pressure through tee junction first high pressure of tee junction and is got pressure pipe and pressure pipe, the low pressure is got pressure pipe and is got pressure pipe through tee junction first low pressure of tee junction and second low pressure, this.

Description

Nozzle flowmeter

Technical Field

The utility model relates to a nozzle flowmeter for measure fluidic flow.

Background

The measurement principle of long-neck nozzle flowmeters is based on the flow continuity equation (law of conservation of mass) and the bernoulli equation (law of conservation of energy). When fluid filled in the pipeline flows through the long-neck nozzle in the pipeline, the flow velocity forms local contraction at the throttling part, so that the flow velocity is increased, the static pressure is reduced, pressure difference is generated before and after the nozzle, the larger the fluid flow is, the larger the pressure difference is, and the flow value is obtained according to the fact that the flow is in direct proportion to the square root of the differential pressure. However, the current flow meter has the following disadvantages: 1. the pressure loss is large; 2. the measurement accuracy is medium, and the accuracy is difficult to improve because the stability of the flow field after the throttling of the nozzle is low; 3. the flowmeter needs a longer straight pipe section to recover the pressure; 4. when the existing flowmeter is actually used, once a differential pressure transmitter fails, the existing flowmeter cannot be continuously used, so that the existing flowmeter cannot be used when the differential pressure transmitter is replaced or repaired when maintenance and repair are carried out.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: the utility model provides a nozzle flowmeter, this flowmeter can be when maintaining the maintenance to differential pressure transmitter still can be accurate detection medium flow to guarantee going on smoothly of flow measurement work, still carry out the rectification to the flow field simultaneously, reduced vibration and vortex, make flow field stability improve greatly.

In order to solve the technical problem, the technical scheme of the utility model is that: a nozzle flowmeter comprises a straight pipe section and a nozzle arranged in the straight pipe section, wherein the upstream end and the downstream end of the straight pipe section are fixedly connected with an upstream connecting flange and a downstream connecting flange respectively, the nozzle is fixed in the middle of the straight pipe section, the nozzle comprises a nozzle edge part and a tubular nozzle part which are integrally formed, a throttling channel of the tubular nozzle part and an inner hole of the straight pipe section are concentrically arranged, a plurality of rectifying holes are uniformly distributed on the circumference of the nozzle edge part, a high-pressure taking port and a low-pressure taking port are respectively arranged on the upstream side and the downstream side of the nozzle on the straight pipe section, the high-pressure taking port and the low-pressure taking port are respectively and fixedly communicated with a high-pressure taking pipe connector and a low-pressure taking pipe connector, the high-pressure taking pipe connector is connected with a first high-pressure taking pipe and a second high-pressure taking pipe which are provided with stop valves through a tee, the low-pressure taking pipe connector is connected, the first high-pressure sampling pipe and the first low-pressure sampling pipe are connected with a first differential pressure transmitter through a first three-valve group; and the second high-pressure tapping pipe and the second low-pressure tapping pipe are connected with a second differential pressure transmitter through a second three-valve group.

Preferably, the rectifying hole is a notch-shaped rectifying hole provided in an outer edge of the mouth edge portion.

Preferably, the downstream end of the throttling passage of the tubular mouth part is provided with a flaring taper shape.

Preferably, the junction between the mouth edge portion and the tubular mouth portion is a connecting portion with a circular arc transition.

Preferably, the upstream connecting flange and the downstream connecting flange have the same structure, the upstream connecting flange comprises a flange portion, a tapered reinforcing pipe section and a linear pipe section which are integrally formed, the outer diameter and the inner diameter of the linear pipe section are equal to those of the straight pipe section, and the linear pipe section and the straight pipe section are welded and fixed.

As a preferred scheme, the high-pressure tapping and the low-pressure tapping are the same in structure, a stepped hole section is arranged at the outer side end of the high-pressure tapping, and a high-pressure tapping pipe joint is plugged into the stepped hole section and is welded and fixed with the high-pressure tapping.

Preferably, the low pressure tapping port is located between the rim portion and the tubular mouth portion.

After the technical scheme is adopted, the utility model discloses an effect is: 1. because the nozzle includes integrated into one piece's mouth edge portion and tubulose mouth, the throttle passageway of tubulose mouth sets up with the hole of straight tube section is concentric, the circumference equipartition has a plurality of rectification hole on the mouth edge portion, consequently, increase flow area reduces the formation of vortex, reduces the loss of kinetic energy, and loss of pressure reduces, makes flow field stability improve greatly, and pressure recovery is also faster to the requirement to the straight tube section has been shortened greatly. 2. The low-pressure tapping pipe joint is connected with a first low-pressure tapping pipe and a second low-pressure tapping pipe which are provided with stop valves through a tee joint, and the first high-pressure tapping pipe and the first low-pressure tapping pipe are connected with a first differential pressure transmitter through a first three-valve group; the second high pressure is got and is pressed between pipe and the second low pressure and is got and link to each other with second differential pressure transmitter through the third valves of second, consequently, when one of them differential pressure transmitter goes wrong and need overhaul, can make another differential pressure transmitter work through switching over the circuit, can also continue to carry out flow monitoring at the in-process of overhauing like this.

And because the rectifying hole is a notch-shaped rectifying hole which is arranged at the outer edge of the nozzle edge part, the fluid can better flow along the straight pipe section, the fluid can more smoothly pass through the rectifying hole, and the eddy phenomenon is reduced.

And because the connection part of the mouth edge part and the tubular mouth part is a connecting part with arc transition, the fluid is contacted with the smooth connecting part, and the pressure detection inaccuracy caused by abrasion is reduced.

And because the high-pressure-taking port and the low-pressure-taking port have the same structure, the outer side end of the high-pressure-taking port is provided with a stepped hole section, and the high-pressure-taking pipe joint is plugged into the stepped hole section and is welded and fixed with the high-pressure-taking port, so that the high-pressure-taking pipe joint is more accurately and conveniently fixed.

Drawings

The present invention will be further explained with reference to the drawings and examples.

FIG. 1 is a cross-sectional view of the structure of an embodiment of the present invention;

FIG. 2 is an enlarged view of the structure at A in FIG. 1;

fig. 3 is a left side view of an embodiment of the invention;

in the drawings: 1. a straight pipe section; 2. a nozzle; 21. a mouth edge portion; 22. a tubular mouth; 23. a throttling channel; 24. a flow rectifying hole; 25. a connecting portion; 3. an upstream connecting flange; 31. a flange portion; 32. a tapered reinforced pipe section; 33. a linear pipe section; 4. a downstream connecting flange; 5. a high-pressure tapping; 6. a low-pressure tapping port; 7. a high-pressure tapping pipe joint; 8. a low-pressure tapping pipe joint; 9. a first high-pressure tapping pipe; 10. a second high-pressure tapping pipe; 11. a first low-pressure tapping pipe; 12. a second low-pressure tapping pipe; 13. a second third valve bank; 14. a second differential pressure transmitter.

Detailed Description

The present invention will be described in further detail with reference to the following examples.

As shown in fig. 1-3, a nozzle 2 flowmeter comprises a straight pipe section 1 and a nozzle 2 arranged inside the straight pipe section 1, wherein an upstream end and a downstream end of the straight pipe section 1 are fixedly connected with an upstream connecting flange 3 and a downstream connecting flange 4 respectively, the nozzle 2 is fixed in the middle of the straight pipe section 1, the nozzle 2 comprises a nozzle edge part 21 and a tubular nozzle part 22 which are integrally formed, a throttling channel 23 of the tubular nozzle part 22 is concentrically arranged with an inner hole of the straight pipe section 1, a plurality of rectifying holes 24 are uniformly distributed on the circumference of the nozzle edge part 21, a high pressure taking port 5 and a low pressure taking port 6 are respectively arranged on the straight pipe section 1 at the upstream side and the downstream side of the nozzle 2, the high pressure taking port 5 and the low pressure taking port 6 are respectively and fixedly communicated with a high pressure taking pipe joint 7 and a low pressure taking pipe joint 8, the high pressure taking pipe joint 7 is connected with a first high pressure taking pipe 9 and a second high pressure, the low-pressure tapping pipe joint 8 is connected with a first low-pressure tapping pipe 11 and a second low-pressure tapping pipe 12 which are provided with stop valves through a tee joint, and the first high-pressure tapping pipe 9 and the first low-pressure tapping pipe 11 are connected with a first differential pressure transmitter through a first three-valve group; and the second high-pressure tapping pipe 10 and the second low-pressure tapping pipe 12 are connected with a second differential pressure transmitter 14 through a second third valve bank 13.

In the present embodiment, the rectifying hole 24 is a notch-shaped rectifying hole 24, the notch-shaped rectifying hole 24 is provided at the outer edge of the mouth edge portion 21, the downstream end of the throttle passage 23 of the tubular mouth portion 22 is provided in a flared cone shape, and the junction between the mouth edge portion 21 and the tubular mouth portion 22 is a connecting portion 25 in which an arc transitions.

In this embodiment, the upstream connecting flange 3 and the downstream connecting flange 4 have the same structure, the upstream connecting flange 3 includes an integrally formed flange portion 31, a tapered reinforcing pipe section 32 and a linear pipe section 33, the outer diameter and the inner diameter of the linear pipe section 33 are both equal to the outer diameter and the inner diameter of the straight pipe section 1, the linear pipe section 33 is welded and fixed to the straight pipe section 1, the high-pressure tapping port 5 and the low-pressure tapping port 6 have the same structure, a stepped hole section is provided at the outer side end of the high-pressure tapping port 5, the high-pressure tapping pipe joint 7 is plugged into the stepped hole section and welded and fixed to the high-pressure tapping port 5, the low-pressure tapping port 6 is located between the nozzle edge portion 21 and the tubular nozzle portion 22, and of course, the structures of the connecting flange and the downstream.

When the pressure-measuring device is used, the throttling channel 23 of the tubular mouth part 22 and the inner hole of the straight pipe section 1 are concentrically arranged, a plurality of rectifying holes 24 are uniformly distributed on the circumference of the mouth edge part 21, the downstream end of the throttling channel 23 of the tubular mouth part 22 is in a flaring taper shape, and the joint of the mouth edge part 21 and the tubular mouth part 22 is a connecting part 25 in circular arc transition, so that the flow area is increased, the formation of vortex is reduced, and the stability of a flow field is greatly improved; second high pressure is got and is pressed pipe 10 and second low pressure and is got and link to each other with second differential pressure transmitter 14 through second third valves 13 between pipe 12, when first differential pressure transmitter or second differential pressure transmitter 14 go wrong and need overhaul, through switching over the circuit, use second differential pressure transmitter 14 or first differential pressure transmitter work can.

In this embodiment, as shown in fig. 1, the first third valve bank and the first differential pressure transmitter are omitted and not shown, the second third valve bank 13 has the same structure as the first third valve bank, and the second differential pressure transmitter 14 has the same structure as the first differential pressure transmitter, and thus the description thereof is omitted.

The above-mentioned embodiments are only descriptions of the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and all modifications and changes made by the technical solution of the present invention should fall within the protection scope defined by the claims of the present invention on the basis of not departing from the spirit of the present invention.

Claims

1. The utility model provides a nozzle flowmeter, includes the straight tube section and sets up the inside nozzle in straight tube section, its characterized in that: the upstream end and the downstream end of the straight pipe section are respectively and fixedly connected with an upstream connecting flange and a downstream connecting flange, the nozzle is fixed in the middle of the straight pipe section and comprises a nozzle edge part and a tubular nozzle part which are integrally formed, the throttling channel of the tubular mouth part and the inner hole of the straight pipe section are concentrically arranged, a plurality of rectifying holes are uniformly distributed on the circumference of the mouth edge part, the straight pipe section is provided with a high-pressure tapping opening and a low-pressure tapping opening at the upstream side and the downstream side of the nozzle respectively, the high-pressure tapping opening and the low-pressure tapping opening are respectively and fixedly communicated with a high-pressure tapping pipe joint and a low-pressure tapping pipe joint, the high-pressure tapping pipe joint is connected with a first high-pressure tapping pipe and a second high-pressure tapping pipe which are provided with stop valves through a tee joint, the low-pressure tapping pipe joint is connected with a first low-pressure tapping pipe and a second low-pressure tapping pipe which are provided with stop valves through a tee joint, and the first high-pressure tapping pipe and the first low-pressure tapping pipe are connected with a first differential pressure transmitter through a first three-valve group; and the second high-pressure tapping pipe and the second low-pressure tapping pipe are connected with a second differential pressure transmitter through a second three-valve group.

2. A nozzle flow meter according to claim 1, wherein: the rectifying hole is a notch-shaped rectifying hole which is arranged at the outer edge of the mouth edge part.

3. A nozzle flow meter according to claim 2, wherein: the downstream end of the throttling channel of the tubular mouth part is arranged in a flaring taper shape.

4. A nozzle flow meter according to claim 1, wherein: the connection part of the mouth edge part and the tubular mouth part is a connecting part with arc transition.

5. A nozzle flow meter according to any of claims 1 to 4, wherein: the structure of the upstream connecting flange is the same as that of the downstream connecting flange, the upstream connecting flange comprises an integrally formed flange portion, a conical reinforcing pipe section and a linear pipe section, the outer diameter and the inner diameter of the linear pipe section are equal to those of the straight pipe section, and the linear pipe section and the straight pipe section are welded and fixed.

6. A nozzle flow meter according to claim 5, wherein: the structure of the high-pressure tapping is the same as that of the low-pressure tapping, a stepped hole section is arranged at the outer side end of the high-pressure tapping, and the high-pressure tapping pipe joint is plugged into the stepped hole section and is welded and fixed with the high-pressure tapping.

7. A nozzle flow meter according to claim 1, wherein: the low pressure taking port is positioned between the mouth rim portion and the tubular mouth portion.