A gas ultrasonic flow meter with wide range that does not require straight pipe section

Abstract

The present invention proposes a gas ultrasonic flowmeter that does not require a wide range of straight pipe sections, including: an air inlet and an air outlet are respectively arranged on both sides of a lower cavity, a flow detection straight pipe section and a degree bend are installed in the lower cavity, one end of the degree bend 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, and multiple groups of upper and lower detection ports are respectively arranged on the flow detection straight pipe section, and ultrasonic sensors are installed in the detection ports; a rectifying and silencing filter is also arranged in the lower cavity, and the bend passes through the center of the rectifying and silencing filter. The beneficial effect is that the high-speed airflow enters the cavity in the lower cavity, and because the cavity is much larger than the diameter of the air inlet, the gas forms a buffer zone in the lower cavity, reducing the speed and noise, and the gas then passes through the rectifying and silencing filter into the upper cavity, and the gas flows from the flow detection straight pipe section in the upper cavity into the bend and flows out from the air outlet. The gas reduces turbulence and noise through the above-mentioned flow process, reduces the impact on the flow detection accuracy, improves the metering accuracy and increases the range ratio at the same time.

Description

Technical Field

[0001] The invention relates to a gas ultrasonic flow meter, in particular to a gas ultrasonic flow meter which does not require a straight pipe section with a wide measuring range. Background Art

[0002] At present, with the construction and popularization of gas transmission pipelines, gas meters with new concept technologies are emerging like mushrooms after rain. Ultrasonic flowmeters are purely electronic structures. Compared with previous mechanical flowmeters, their advantages are: 1. There is no mechanical transmission part, so there is no mechanical noise during operation and it is not affected by mechanical wear and failure; 2. There is no magnetic induction element, and the measurement is not easily affected by the magnetic field; 3. Ultrasonic flowmeters have high accuracy, 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 flowmeters have gas turbulence and noise in the gas transmission pipeline, which affects the stability and measurement accuracy of the ultrasonic flowmeter, and 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

[0003] In order to solve the problems existing in the prior art and overcome the influence of gas turbulence and noise in the existing gas transmission pipeline on pipeline flow measurement, the present invention provides a new flow meter that can effectively reduce gas turbulence and noise in the pipeline, thereby improving the measurement accuracy and wide range of the natural gas flow meter.

[0004] The technical solution of the present invention is achieved in this way:

[0005] A gas ultrasonic flowmeter that does not require a straight pipe section with a wide range, comprising: a cavity with a cavity, the cavity consisting of an upper cavity and a lower cavity, the upper cavity and the lower cavity are fixed by bolt connection, an air inlet and an air outlet are respectively provided on both sides of the lower cavity, a flow detection straight pipe and a bent pipe are installed in the lower cavity, the lower end of the flow detection straight pipe is threadedly connected to the bent pipe, one end of the bent pipe is connected to the air outlet, and the other end is connected to the flow detection straight pipe, the upper end of the flow detection straight pipe is located in the cavity of the upper cavity, and multiple groups of upper and lower detection ports are respectively provided on the flow detection straight pipe, and ultrasonic sensors are installed at the detection ports; a silencer filter is also provided in the lower cavity, and the bent pipe passes through the center of the silencer filter.

[0006] Furthermore, a bolt connection seat is provided at each of the four corners of the lower cavity, and through holes are also provided at the four corners of the upper cavity. The bolt connection seats correspond to the through holes one by one and are fixed by bolts; a threaded connection part is also provided at the lower end of the upper cavity, and an internal thread matching the threaded connection part is provided at the upper end of the lower cavity.

[0007] Furthermore, four bosses are provided on the inner wall of the lower cavity, mounting holes are provided on the bosses, and the silencer filter is fixed on the bosses; two columns are provided at the bottom of the lower cavity, threaded holes are provided at the upper ends of the columns, and a pair of fixing ears corresponding to the columns are provided on the bent pipe, and the fixing ears are fixed to the columns by bolts.

[0008] Furthermore, two symmetrical connecting seats are provided on the flow detection straight pipe, each of the connecting seats is connected to two connecting rods, and the lower ends of the connecting rods are pressed on the silencer filter and fixed to the boss through the mounting holes.

[0009] Furthermore, a mask and a display box are provided outside the upper cavity, a circuit board and a battery are provided in the display box, and a display is provided on the mask.

[0010] The beneficial effects of the present invention are:

[0011] 1. High-speed airflow enters the cavity inside the chamber. Since the cavity is larger than the diameter of the air inlet, the gas enters the cavity for buffering and noise reduction; then it passes through the rectification and silencer filter, and the gas becomes a stable fluid suitable for metering, which improves the metering accuracy, improves the stability of small flow, and broadens the detection range of small flow;

[0012] 2. The device has a compact structure and a wide range of applications. It can directly replace the existing wheel waist and Roots flowmeter without changing the existing pipeline equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a structural schematic diagram of the present invention;

[0015] Figure 2 is a cross-sectional view of the present invention;

[0016] Figure 3 It is a schematic diagram of the structure of a straight pipe and a curved pipe;

[0017] Figure 4 is a schematic diagram of the structure of the lower cavity;

[0018] Figure 5 Schematic diagram of the structure of the upper cavity. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] like Figure 1~Figure 5 A gas ultrasonic flowmeter that does not require a straight pipe section with a wide range includes: a cavity 1 with a cavity, the cavity 1 is composed of an upper cavity 2 and a lower cavity 3, a bolt connection seat 4 is provided at each of the four corners of the lower cavity 3, and a through hole 5 is also provided at the four corners of the upper cavity 2, the bolt connection seat 4 corresponds to the through hole 5 one by one and is fixed by bolts; a threaded connection part 6 is also provided at the lower end of the upper cavity 2, and an internal thread matching the threaded connection part 6 is provided at the upper end of the lower cavity 3, the threaded connection part 6 is an external thread, and is screwed tightly with the internal thread on the lower cavity 3.

[0021] An air inlet 7 and an air outlet 8 are respectively provided on both sides of the lower cavity 3. A flow detection straight pipe 9 and a curved pipe 10 are installed in the lower cavity 3. The flow detection straight pipe 9 is connected to the curved pipe 10 by threads. One end of the curved 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. Multiple groups of upper and lower detection ports 11 are respectively provided on the flow detection straight pipe 9, and ultrasonic sensors 12 are installed at the detection ports 11. A silencer filter 13 is also provided in the lower cavity 3, and the curved pipe 10 passes through the center of the silencer filter 13.

[0022] 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 .

[0023] Two symmetrical connecting seats 16 are also provided on the flow detection straight pipe 9 , and each connecting seat 16 is connected to two connecting rods 17 . The lower ends of the connecting rods 17 are pressed on the silencer filter 13 and fixed to the boss 14 through the mounting holes 15 .

[0024] A mask 18 and a display box 19 are further provided outside the upper cavity 2 . A circuit board and a battery are provided in the display box 19 , and a display 20 is provided on the mask 18 .

[0025] Two columns 21 are further provided at the bottom of the lower cavity 3 , threaded holes are provided at the upper ends of the columns 21 , and a pair of fixing ears 22 corresponding to the columns 21 are provided on the elbow 10 , and the fixing ears 22 are fixed to the columns 21 by bolts.

[0026] When in use, air is taken in from the air inlet 7, the gas enters the cavity in the cavity 1, and enters the flow detection straight tube 9 from the upper end, and then passes through the curved tube 10 and is discharged from the air outlet 8; in this process, a high-speed airflow enters the cavity in the cavity 1. Since the cavity is larger than the diameter of the air inlet 7, the gas enters the cavity 1 for buffering and noise reduction; and then passes through the silencer filter 13, the gas becomes a stable fluid suitable for metering, thereby improving the metering accuracy, while also improving the stability of small flow rates, and widening the detection range of small flow rates.

[0027] The ultrasonic sensor 12 sends a signal to a circuit board in the display box 19 , and the circuit board converts the signal and displays it on the display 20 .

[0028] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A gas ultrasonic flow meter that does not require a straight pipe section with a wide range, comprising: A cavity with a cavity, the cavity consists of an upper cavity and a lower cavity, the upper cavity and the lower cavity are fixed by bolt connection, characterized in that: an air inlet and an air outlet are respectively arranged on both sides of the lower cavity, a flow detection straight pipe and a bent pipe are installed in the lower cavity, the lower end of the flow detection straight pipe is threadedly connected to the bent pipe, one end of the bent pipe is connected to the air outlet, and the other end is connected to the flow detection straight pipe, the upper end of the flow detection straight pipe is located in the cavity of the upper cavity, and multiple groups of upper and lower detection ports are respectively arranged on the flow detection straight pipe, and ultrasonic sensors are installed at the detection ports; A silencer filter is also provided in the cavity, and the bent pipe passes through the center of the silencer filter; a bolt connection seat is provided at each of the four corners of the lower cavity, and through holes are also provided at the four corners of the upper cavity, and the bolt connection seats correspond to the through holes one by one and are fixed by bolts; a threaded connection part is also provided at the lower end of the upper cavity, and an internal thread matching the threaded connection part is provided at the upper end of the lower cavity; two symmetrical connection seats are also provided on the flow detection straight pipe, each of the connection seats is connected to two connecting rods, and the lower ends of the connecting rods are pressed on the silencer filter and fixed to the boss through the mounting hole.

2. The gas ultrasonic flowmeter without straight pipe section and wide range according to claim 1, characterized in that: 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.

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