CN111366210A - Gas ultrasonic flowmeter without straight pipe section wide range - Google Patents

Abstract

The invention proposes a gas ultrasonic flowmeter that does not require a wide range of straight pipe sections, including: the lower cavity is provided with an air inlet and an air outlet respectively on both sides, and a flow detection straight pipe section and a curved pipe are installed in the lower cavity. One end of the curved pipe is connected to the air outlet, and the other end is connected to the flow detection straight pipe section. The upper end of the flow detection straight pipe is located in the cavity of the upper cavity. An ultrasonic sensor is installed at the detection port; a rectifying and muffler filter is also arranged in the lower cavity, and the elbow passes through the center of the rectifier and muffler filter. The beneficial effect is: the high-speed airflow enters the cavity in the lower cavity. Since the cavity is much larger than the diameter of the air inlet, the gas forms a buffer zone in the lower cavity to reduce the speed and noise, and then the gas passes through the rectification and noise reduction filter net Entering the upper cavity, the gas flows into the elbow from the flow detection straight pipe section in the upper cavity, and flows out from the gas outlet. The gas reduces turbulence and noise through the above flow process, reduces the influence on the flow detection accuracy, improves the measurement accuracy and increases the turndown ratio.

Description

A Gas Ultrasonic Flowmeter Without Wide Range of Straight Pipe Sections

technical field

The invention relates to a gas ultrasonic flowmeter, in particular to a gas ultrasonic flowmeter that does not require a wide range of straight pipe sections.

Background technique

At present, with the construction and popularization of gas pipelines, gas meters with new concepts and technologies have sprung up like mushrooms after a rain. The ultrasonic flowmeter is a purely electronic structure. Compared with the previous mechanical flowmeters, its advantages are: 1. There is no mechanical transmission part, so there is no mechanical noise in operation, and it is not affected by mechanical wear and failure; 2. No magnetic induction components, measurement It is not easily affected by magnetic fields; 3. Ultrasonic flowmeters have high precision, long life, easy maintenance, wide measurement range, and high intelligence; therefore, ultrasonic flowmeters are the development trend of gas measurement in the future, but the current ultrasonic flowmeter gas pipeline Due to the existence of gas turbulence, noise, etc., the stability and measurement accuracy of the ultrasonic flowmeter are affected. The stability of small flow is poor, and it is necessary to install straight pipe sections and rectifiers to improve the measurement accuracy.

SUMMARY OF THE INVENTION

In order to solve the problems existing in the prior art and overcome the influence of gas turbulence and noise in the existing gas pipelines on the pipeline flow measurement, the invention provides a new type of flowmeter, which can effectively reduce the gas flow in the pipeline. Gas turbulence, noise, thereby improving the measurement accuracy and wide range of natural gas flow meters.

The technical scheme of the present invention is realized as follows:

A gas ultrasonic flowmeter that does not require a wide range of straight pipe sections, comprising: a cavity with a cavity, the cavity is composed of an upper cavity and a lower cavity, and the upper cavity and the lower cavity are connected and fixed by bolts, Two sides of the lower cavity are respectively provided with an air inlet and an air outlet, a flow detection straight pipe and an elbow are installed in the lower cavity, and the lower end of the flow detection straight pipe is threadedly connected to the elbow, One end of the elbow is connected with the air outlet, and the other end is connected with the flow detection straight pipe. The upper end of the flow detection straight pipe is located in the cavity of the upper cavity, and the flow detection straight pipe is respectively provided with There are multiple sets of upper and lower detection ports, and ultrasonic sensors are installed in the detection ports; a noise-absorbing filter screen is also arranged in the lower cavity, and the elbow passes through the center of the noise-absorbing filter screen.

Further, each of the four corners of the lower cavity is provided with a bolt connection seat, and the four corners of the upper cavity are also provided with through holes, and the bolt connection seats correspond to the through holes one-to-one and are fixed by bolts; The lower end of the upper cavity is also provided with a threaded connection portion, and the upper end of the lower cavity is provided with an internal thread matching the threaded connection portion.

Further, there are four bosses on the inner wall of the lower cavity, mounting holes are opened on the bosses, and the sound-absorbing filter is fixed on the bosses; at the bottom of the lower cavity Two uprights are also provided, threaded holes are provided at the upper ends of the uprights, a pair of fixing ears corresponding to the uprights are arranged on the elbow, and the fixing ears are fixed on the uprights by bolts.

Further, two symmetrical connection seats are provided on the flow detection straight pipe, each of the connection seats is connected with two connecting rods, and the lower ends of the connecting rods are pressed on the muffler filter and pass through the installation The hole is fixed with the boss.

Further, a mask and a display box are also arranged outside the upper cavity, a circuit board and a battery are arranged in the display box, and a display is arranged on the mask.

The beneficial effects of the present invention are:

1. The high-speed airflow enters the cavity in the cavity. Since the cavity is larger than the diameter of the air inlet, the gas enters the cavity for buffering and noise reduction; and then passes through the rectifying and muffler filter, the gas becomes stable and suitable for metering. It can improve the measurement accuracy, and also improve the stability of small flow, and widen the detection range of small flow;

2. The device has a compact structure and a wide range of applications, and can directly replace the existing wheel waist and Roots flowmeter without changing the existing pipeline equipment.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

Fig. 1 is the structural representation of the present invention;

Fig. 2 is the sectional view of the present invention;

Figure 3 is a schematic structural diagram of a straight pipe and an elbow;

FIG. 4 is a schematic structural diagram of a lower cavity;

FIG. 5 is a schematic structural diagram of the upper cavity.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in Figure 1 to Figure 5, a gas ultrasonic flowmeter that does not require a wide range of straight pipe sections includes: a cavity 1 with a cavity, and the cavity 1 consists of an upper cavity 2 and a lower cavity 3. In the lower cavity 3 Each of the four corners is provided with a bolt connection seat 4, and the four corners of the upper cavity 2 are also provided with through holes 5. The bolt connection seats 4 correspond to the through holes 5 one-to-one and are fixed by bolts; the lower end of the upper cavity 2 is also provided with There is a threaded connection part 6 , and the upper end of the lower cavity 3 is provided with an internal thread matching the threaded connection part 6 , and the threaded connection part 6 is an external thread, which is screwed with the internal thread on the lower cavity 3 .

Both sides of the lower cavity 3 are respectively provided with an air inlet 7 and an air outlet 8, and a flow detection straight pipe 9 and an elbow 10 are installed in the lower cavity 3. The flow detection straight pipe 9 and the elbow 10 are connected by threads, and the bending One end of the pipe 10 is connected to the air outlet 8, and the other end is connected to the flow detection straight pipe 9. The upper end of the flow detection straight pipe 9 is located in the cavity of the upper cavity 2, and the flow detection straight pipe 9 is respectively provided with multiple upper and lower groups. The detection port 11 is installed with an ultrasonic sensor 12 ; the lower cavity 3 is also provided with a noise-absorbing filter screen 13 , and the elbow 10 passes through the center of the noise-absorbing filter screen 13 .

Four bosses 14 are further provided on the inner wall of the lower cavity 3 , and mounting holes 15 are opened on the bosses 14 .

Two symmetrical connection seats 16 are also arranged on the flow detection straight pipe 9, each connection seat 16 is connected with two connecting rods 17, and the lower ends of the connecting rods 17 are pressed on the muffler filter screen 13 and pass through the installation hole 15 and the boss. 14 fixed.

A mask 18 and a display box 19 are also arranged outside the upper cavity 2 , a circuit board and a battery are arranged in the display box 19 , and a display 20 is arranged on the mask 18 .

There are also two uprights 21 at the bottom of the lower cavity 3 , threaded holes are provided at the upper ends of the uprights 21 , and a pair of fixing ears 22 corresponding to the uprights 21 are provided on the elbow 10 .

When in use, the air enters from the air inlet 7, the gas enters the cavity in the cavity 1, and enters the flow detection straight pipe 9 from the upper end of the flow detection straight pipe 9, and then passes through the elbow 10, from the The air outlet 8 is discharged; during this process, the high-speed airflow enters the cavity in the cavity 1. Since the diameter of the cavity is larger than that of the air inlet 7, the gas enters the cavity 1 for buffering and noise reduction; With the muffler filter 13, the gas becomes a stable fluid suitable for metering, which improves the metering accuracy, improves the stability of small flow, and widens the detection range of small flow.

The ultrasonic sensor 12 sends a signal to a circuit board within the display box 19 , which converts and displays the signal on the display 20 .

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. within.

Claims (4)

1. A gas ultrasonic flow meter which does not require a wide range of straight tube sections, comprising: the cavity with cavity, the cavity comprises last cavity and lower cavity, goes up the cavity and passes through bolted connection fixed, its characterized in that with lower cavity: the flow detection device comprises a lower cavity, a flow detection straight pipe and a flow detection straight pipe, wherein the two sides of the lower cavity are respectively provided with an air inlet and an air outlet; still be equipped with the amortization filter screen in the lower cavity body, the return bend passes the center of amortization filter screen.

2. The ultrasonic gas flow meter of claim 1 which does not require a wide range of straight pipe sections, wherein: the four corners of the lower cavity are respectively provided with a bolt connecting seat, the four corners of the upper cavity are also provided with through holes, and the bolt connecting seats are in one-to-one correspondence with the through holes and are fixed through bolts; the lower end of the upper cavity is also provided with a threaded connection part, and the upper end of the lower cavity is provided with an internal thread matched with the threaded connection part.

3. The ultrasonic gas flow meter of claim 1 which does not require a wide range of straight pipe sections, wherein: the flow detection straight pipe is also provided with two symmetrical connecting seats, each connecting seat is connected with 2 connecting rods, and the lower ends of the connecting rods are pressed on the silencing filter screen and are fixed with the bosses through the mounting holes.

4. The ultrasonic gas flow meter of claim 1 which does not require a wide range of straight pipe sections, wherein: the outer part of the upper cavity is also provided with a mask and a display box, a circuit board and a battery are arranged in the display box, and a display is arranged on the mask.

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