CN115855181A - Ultrasonic gas flow metering device - Google Patents

Abstract

The invention discloses an ultrasonic gas flow metering device which comprises a flow path, wherein two ends of the flow path are respectively communicated with an inlet and an outlet, and a pair of transducers are arranged on the flow path; the inlet is in an oblique horn-shaped structure, and the outlet is in stable transition with the flow path channel; the included angle of the two transducers is 60-150 degrees; the flow path is internally provided with a sectional type upper and lower integrated commutator segment, and the upper commutator segment and the lower commutator segment are oppositely arranged in the flow path channel. The invention optimizes the refraction times of the inlet and the outlet, leads the air flow to be more stable in and out, and reduces the pressure of the inlet and the outlet; the angle of the transducer is increased to 60-150 degrees, and the model selection range of the transducer is expanded; the invention adopts the sectional type upper and lower integrated commutator segments to replace the existing independent metal commutator segments, does not need later installation, eliminates errors caused by installation, reduces the cost and enhances the stability of the product.

Description

Ultrasonic gas flow metering device

Technical Field

The invention relates to the technical field of gas meters, in particular to an ultrasonic gas flow metering device.

Background

As shown in fig. 1, in the conventional ultrasonic gas flow metering device, when in use, natural gas enters a gas meter cavity through a valve port, the gas is turned 3 times through an inlet a and then enters a metal fairing area C in a flow path, the fairing averagely divides the gas into a plurality of areas, and a time difference is obtained through a pair of ultrasonic transducers which are installed in a reflection manner, wherein the reflection angle of the ultrasonic transducers is B; finally, the gas flows through the rectifying plate and then flows out of the outlet D.

The existing ultrasonic gas flow metering device has the defects that at least one of the following defects is included:

1. the C position is an independent metal commutator segment, the product price is expensive, the assembly is complex, the installation is not facilitated, and the deformation risk exists after the installation;

2. the gas inlet at the position A in the gas meter flow path can enter the rectifier chip area C only after 3 times of turning, and the turning times are more, so that the stability of gas flow is influenced;

3. the gas outlet at the position D can flow out only after 4 times of turning, and the turning times are more, so that the stability of the gas flow is influenced and the outlet pressure is increased;

4. the reflection angle B of the pair of ultrasonic transducers is less than 60 degrees to meet the requirement of the inlet transducer, and the transducer is single in type selection.

Disclosure of Invention

In view of the above problems in the prior art, the present invention provides an ultrasonic gas flow rate measuring device.

The invention discloses an ultrasonic gas flow metering device which comprises a flow path, wherein two ends of the flow path are respectively communicated with an inlet and an outlet, and a pair of transducers are arranged on the flow path;

the flow path is internally provided with a sectional type upper rectifying piece and a sectional type lower rectifying piece which are integrally arranged in the flow path channel; the upper section fairing is integrally installed on the flow path shell, and the lower section fairing is integrally installed on the flow path lower shell.

As a further improvement of the invention, the inlet is in a bevel horn-shaped structure, and the outlet is smoothly transited with the flow passage.

As a further improvement of the invention, the included angle of the two transducers is 60-150 degrees.

As a further improvement of the present invention, the upper segment fairing and the lower segment fairing include 3 fairings arranged in parallel along the axial direction of the flow passage, and the upper segment fairing or the lower segment fairing is integrally formed on the flow passage upper shell or the flow passage lower shell by injection molding.

As a further improvement of the invention, the length of the upper section rectifying piece or the lower section rectifying piece is 89mm, the width is 5mm, the thickness is 0.5mm, the distance between the adjacent rectifying pieces is 1.5mm, and the interval between the upper section rectifying piece and the lower section rectifying piece is 11mm.

As a further improvement of the invention, the method also comprises the following steps: measuring the PCB;

the measurement PCB board is connected with the two transducers and used for controlling one transducer to transmit ultrasonic waves, and the other transducer to receive the ultrasonic waves.

Compared with the prior art, the invention has the following beneficial effects:

according to the invention, an independent metal commutator segment is omitted, the commutator segment is divided into two sections and is respectively and integrally formed on the flow path upper shell and the flow path lower shell, the later installation is not needed, the error caused by installation is eliminated, the cost is reduced, and the stability of the product is enhanced;

the invention optimizes the refraction times of the inlet and the outlet, leads the air flow to enter and exit more stably and reduces the pressure of the inlet and the outlet;

the invention increases the angle of the transducer to 60-150 degrees, and expands the selection range of the transducer.

Drawings

FIG. 1 is a cross-sectional view of a prior art ultrasonic gas flow metering device;

FIG. 2 is a cross-sectional view of an ultrasonic gas flow meter device according to an embodiment of the present disclosure;

FIG. 3 is a partial cross-sectional view of an ultrasonic gas flow metering device as disclosed in one embodiment of the present invention;

FIG. 4 is a cross-sectional view of a flow path component and a segmented integral top and bottom fairing of an ultrasonic gas flow metering device as disclosed in one embodiment of the present invention;

fig. 5 is a schematic usage diagram of an ultrasonic gas flow metering device according to an embodiment of the present invention.

In the figure:

1. an inlet; 2. an outlet; 3. a transducer; 4. a segmented upper and lower integral commutator segment; 5. a commutator segment; 6. a flow path upper housing; 7. a flow path lower case; alpha, the angle between the two transducers.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

The invention is described in further detail below with reference to the following drawings:

as shown in fig. 2 to 3, the present invention provides an ultrasonic gas flow meter, which is improved as follows on the basis that the existing ultrasonic gas flow meter comprises a flow path, the two ends of the flow path are respectively communicated with an inlet 1 and an outlet 2, and a pair of transducers 3 are arranged on the flow path; it includes:

the inlet 1 of the invention is in an oblique horn-shaped structure, namely, the flow guide part at the inlet of the metering pipe section is designed into the oblique horn-shaped structure, so that the inlet 1 and a flow path channel are in stable transition; the outlet and the flow passage are in stable transition in the form of same-diameter connection, conical transition and the like, so that the measured fluid is ensured to flow into the flow passage after passing through the bevel horn and then flow out of the outlet; the structure can effectively reduce the gas fluctuation in the ultrasonic measurement area, so that the fluid in the flow passage is more stable; thereby improving the repeatability of ultrasonic detection and the stability of small flow, and reducing pressure loss; even if flow in very big flow, also be difficult for taking place the disorder of air current in the measurement pipeline section, be difficult for receiving the influence of environment all around, strengthened the interference killing feature, can realize stable measurement performance to make the measurement of ultrasonic wave gas table more accurate.

The included angle of the two transducers is 60-150 degrees, and the design of the included angle enlarges the model selection range of the transducers. Further, the present invention also includes: the metering PCB is used for metering gas flowing through the meter body; the metering PCB board is connected with the two transducers and used for controlling one transducer to transmit ultrasonic waves, the other transducer to receive the ultrasonic waves, time difference between forward flow and reverse flow can be generated due to the flowing direction of gas, and finally, the gas flow is metered by utilizing the time difference.

A sectional upper and lower integrated rectifying pieces 4 are installed in a flow passage of the invention, the sectional upper and lower integrated rectifying pieces 4 are composed of an upper rectifying piece and a lower rectifying piece, and the upper rectifying piece and the lower rectifying piece are installed in the flow passage oppositely. Specifically, as shown in fig. 4, the upper segment of the flow passage fairing of the present invention is integrally mounted on the flow passage upper housing 6, and the lower segment of the flow passage fairing is integrally mounted on the flow passage lower housing 7; furthermore, the upper section fairing and the lower section fairing both comprise 3 fairings 5,3 which are arranged in parallel along the axial direction of the flow passage and have consistent intervals, and the upper section fairing or the lower section fairing is integrally formed on the flow passage upper shell 6 or the flow passage lower shell 7 in an injection molding mode. Preferably, the length of the upper section fairing or the lower section fairing is 89mm, the width is 5mm, the thickness is 0.5mm, the distance between the adjacent fairings is 1.5mm, and the interval between the upper section fairing and the lower section fairing is 11mm; based on the structure, the invention cancels the independent metal commutator segments, divides the commutator segments into two sections and respectively and integrally forms the two sections on the upper shell and the lower shell of the flow path, does not need to be installed at the later stage, eliminates the error caused by installation, reduces the cost and enhances the stability of the product.

As shown in fig. 5, the working principle of the present invention includes:

the natural gas enters the cavity of the gas meter through a valve port, the gas flows through a flow path inlet and then flows into a sectional type upper and lower integrated rectifier plate area, the upper rectifier plate mainly rectifies the transmitting position of the shell transducer on the flow path, the lower rectifier plate mainly rectifies the reflecting position of the sound wave transmitted by the transducer, and the gas flow is uniformly distributed after rectification, so that the accuracy of time difference calculation is facilitated; the gas flows out from the flow path outlet after flowing through the rectifier area, and then flows into a gas stove and other gas equipment of a user through the outlet of the gas meter.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. An ultrasonic gas flow metering device comprises a flow path, wherein two ends of the flow path are respectively communicated with an inlet and an outlet, and a pair of transducers are arranged on the flow path; it is characterized in that the preparation method is characterized in that,

the flow path is internally provided with a sectional type upper rectifying piece and a sectional type lower rectifying piece which are oppositely arranged in the flow path channel; the upper section fairing is integrally installed on the flow path shell, and the lower section fairing is integrally installed on the flow path lower shell.

2. An ultrasonic gas flow meter as claimed in claim 1, wherein the inlet is of a bell-mouth configuration and the outlet smoothly transitions into the flow path.

3. An ultrasonic gas flow meter as claimed in claim 1, wherein the angle between the two transducers is 60 ° to 150 °.

4. The ultrasonic gas flow meter of claim 1, wherein the upper segment fairing and the lower segment fairing comprise 3 fairings arranged in parallel along the axial direction of the flow passage, and the upper segment fairing or the lower segment fairing is integrally injection-molded on the flow passage upper shell or the flow passage lower shell.

5. An ultrasonic gas flow meter according to claim 1, wherein the upper or lower segment is 89mm long, 5mm wide, 0.5mm thick, 1.5mm apart between adjacent segments, and 11mm apart.

6. An ultrasonic gas flow metering device as claimed in claim 1, further comprising: measuring the PCB;

the measurement PCB board is connected with the two transducers and used for controlling one transducer to transmit ultrasonic waves, and the other transducer to receive the ultrasonic waves.

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