Ultrasonic gas flowmeter

Abstract

The invention belongs to the technical field of measuring instrument production and manufacturing, and provides an ultrasonic gas flowmeter. The device comprises an outer-layer pipeline, an embedded metering pipeline embedded in the outer-layer pipeline, and a rectifier arranged at one end of the outer-layer pipeline, the embedded metering pipeline comprises a metering pipeline body, an air leakage hole formed in the metering pipeline body, a transducer installation part arranged on the metering pipeline body and communicated with the interior of the metering pipeline body, an ultrasonic transducer installed through the transducer installation part, and a temperature and pressure sensor integrally arranged on the metering pipeline body. On the premise that the comprehensive performance is not changed, the power consumption, the size and the production and manufacturing cost of the ultrasonic gas flow meter are reduced, the requirement of customers for adopting the ultrasonic gas flow meter with excellent performance under the condition that budget is not increased is met, and the economic, low-carbon, environment-friendly and sustainable energy strategy of enterprises and the country is assisted.

Description

Technical Field

[0001] The invention belongs to the technical field of measuring instrument production and manufacturing, and specifically relates to an ultrasonic gas flow meter. Background Art

[0002] ‌The main difference between ultrasonic gas flowmeter and traditional flowmeter lies in their working principle, applicable scenarios and advantages. ‌ Ultrasonic gas flowmeter uses the principle of sound velocity difference of ultrasonic propagation to calculate the flow velocity and flow rate of the fluid by measuring the propagation speed of ultrasonic waves in the fluid, while traditional flowmeters such as turbine flowmeter and orifice flowmeter use different physical principles for measurement.

[0003] The main advantages of ultrasonic gas flowmeters include: (1) No moving parts: Ultrasonic flowmeters do not insert any components into the fluid, have no effect on the flow rate, and have no pressure loss. (2) Wide range of applications: Able to measure the flow of various medium gases. (3) Applicable to large-diameter pipelines: For flow measurement of large-diameter pipelines, investment will not increase due to the large diameter of the pipe. (4) Wide range: The range ratio can reach 100:1 or above, and there is a linear relationship between the output and the flow. (5) Strong environmental adaptability: The installation method adopts non-contact type, which has strong adaptability to the environment of various industrial sites.

[0004] In contrast, the disadvantages of traditional flow meters such as turbine flow meters and orifice flow meters include: (1) There are moving parts: Turbine flowmeters have blades and multi-pulse technology, which may affect accuracy after long-term use. (2) Limited scope of application: Turbine flowmeters are easily affected by impurities, while orifice flowmeters have problems such as low repeatability, narrow range, and large pressure loss. (3) Poor environmental adaptability: Traditional flowmeters may not be able to adapt to complex industrial environments, affecting measurement accuracy and stability.

[0005] Although the metering performance of ultrasonic gas flow meters is significantly better than that of traditional gas flow meters, the current market price of ultrasonic gas flow meters is much higher than that of traditional gas flow meters, resulting in a low usage rate of ultrasonic gas flow meters in China, especially small-diameter flow meters.

[0006] The typical structure of a traditional gas ultrasonic flow meter is as follows: Figure 1As shown, it mainly includes a display panel, a flow meter display control panel, a wire pipe, an instrument housing, a rectifier, an ultrasonic transducer cover, an ultrasonic transducer, a battery cover, and a lithium battery. Based on the above structure, the installed ultrasonic transducer needs to withstand high pressure and ensure sealing. Therefore, the ultrasonic transducer needs to be encapsulated in a stainless steel or other high-hardness housing, resulting in the ultrasonic transducer requiring a very high excitation voltage; in addition, it is necessary to open a hole in the flow meter pipe section to install a pressure sensor and a temperature sensor. It can be seen that the traditional gas ultrasonic flow meter has the following main defects: high power consumption of the whole machine, large size, and high production cost. Summary of the invention

[0007] The purpose of the present invention is to provide an ultrasonic gas flow meter to solve the technical problems existing in the prior art.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is as follows: An ultrasonic gas flowmeter comprises an outer layer pipeline, an embedded metering pipeline embedded in the outer layer pipeline, and a rectifier arranged at one end of the outer layer pipeline; the embedded metering pipeline comprises a metering pipeline, an air leakage hole arranged on the metering pipeline, a transducer mounting part arranged on the metering pipeline and connected to the interior of the metering pipeline, an ultrasonic transducer mounted by the transducer mounting part, and a temperature and pressure sensor integrated on the metering pipeline.

[0009] As a preferred solution, the outer layer pipe includes a first outer layer pipe and a second outer layer pipe connected by a flange, the left end of the first outer layer pipe is provided with a connecting flange and the rectifier is installed at this end, the right end of the second outer layer pipe is provided with a connecting flange, and a display mechanism is provided on the side of the second outer layer pipe.

[0010] As a preferred solution, the ultrasonic transducer is placed in the transducer mounting portion, and the end of the transducer mounting portion is connected to a fastening pressing plate having a first through hole by bolts.

[0011] As a preferred solution, a circuit board installation cavity is provided on the side of the metering pipe, an ultrasonic metering circuit board is installed in the circuit board installation cavity, and the temperature and pressure sensors are arranged on the ultrasonic metering circuit board.

[0012] As a preferred solution, the circuit board installation cavity is covered by a cover plate, and a second through hole is provided on the cover plate, and the temperature and pressure sensor is exposed through the second through hole.

[0013] As a preferred solution, the display mechanism includes a connector and a cable installed on the second outer pipe, and a display box fixed to the second outer pipe via a display box base.

[0014] As a preferred solution, the first outer layer pipe, the second outer layer pipe and the metering pipe are coaxially arranged.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention adopts a double-layer pipeline structure, an embedded metering pipeline is installed inside the outer pipeline, the outer pipeline is used to connect the gas input pipeline and the output pipeline, the ultrasonic transducer is installed on the embedded metering pipeline, and the temperature and pressure sensors are integrated on the embedded metering pipeline, and the embedded metering pipeline completes the measurement of flow, temperature and pressure; compared with the prior art, the technical solution disclosed in the present invention reduces the volume of the ultrasonic gas flowmeter, reduces the overall production cost and the power consumption of the whole machine, and improves the explosion-proof safety performance and metering accuracy of the product, thereby reducing the power consumption, volume and production cost of the ultrasonic gas flowmeter while ensuring the overall performance remains unchanged, meeting the needs of customers to adopt ultrasonic gas flowmeters with superior performance without increasing the budget, and helping the economic, low-carbon and environmental protection, and sustainable energy strategies of enterprises and countries. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the prior art.

[0017] Figure 2 It is a schematic diagram of the explosion of the present invention.

[0018] Figure 3 It is a cross-sectional schematic diagram of the present invention.

[0019] Figure 4 It is a schematic diagram of an explosion of the embedded metering pipeline in the present invention.

[0020] The names corresponding to the reference numerals are as follows: 1—display panel, 2—flow meter display control panel, 3—wire passing tube, 4—instrument housing, 5—rectifier, 6—ultrasonic transducer cover, 7—ultrasonic transducer, 8—battery cover, 9—lithium battery; 10-outer pipe, 11-embedded metering pipe, 12-rectifier, 13-connector and cable, 14-display box base, 15-display box; 101-first outer layer pipeline, 102-second outer layer pipeline; 111 - metering pipeline, 112 - air leakage hole, 113 - transducer mounting part, 114 - ultrasonic transducer, 115 - temperature and pressure sensor, 116 - first through hole, 117 - fastening pressing piece, 118 - circuit board mounting cavity, 119 - ultrasonic metering circuit board, 120 - cover plate, 121 - second through hole. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to have a clearer understanding and knowledge of the present invention, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described below are only used to explain the present invention, and are convenient for understanding. The technical solutions provided by the present invention are not limited to the technical solutions provided by the following embodiments, and the technical solutions provided by the embodiments should not limit the protection scope of the present invention.

[0022] Example like Figures 2~4 As shown, this embodiment provides an ultrasonic gas flowmeter, which adopts a double-layer pipeline structure design, including an outer pipeline and an embedded metering pipeline embedded in the outer pipeline, wherein the outer pipeline is used to connect the gas input pipeline and the output pipeline. Specifically, the outer pipeline includes a first outer pipeline and a second outer pipeline. Taking the figure as a reference, the right end of the first outer pipeline and the left end of the second outer pipeline are connected by a flange, and the left end of the first outer pipeline is provided with a connecting flange, which is used to connect the gas input pipeline, and a rectifier is provided at this end. The right end of the second outer pipeline is provided with a connecting flange, which is used to connect the gas output pipeline. The inner cavity of the second outer pipeline is provided with an embedded cavity, and the main body of the embedded metering pipeline is mainly embedded in the embedded cavity.

[0023] Matching the above structural arrangement, in this embodiment, a display mechanism is arranged on the side of the second outer pipe, and the display mechanism includes a connector and a cable installed on the second outer pipe, and a display box fixed on the second outer pipe through a display box base.

[0024] During assembly, the embedded metering pipe is first embedded into the second outer pipe, and then the first outer pipe and the second outer pipe are connected. Preferably, the first outer pipe, the second outer pipe and the metering pipe are coaxially arranged.

[0025] The embedded metering pipeline mainly completes the measurement of flow, temperature and pressure. In this embodiment, the embedded metering pipeline includes a metering pipeline, on which an air leak hole is arranged. At the same time, a transducer mounting part which is an integral structure with the metering pipeline and is connected with the interior of the metering pipeline is arranged on the metering pipeline, and an ultrasonic transducer is installed through the transducer mounting part. During assembly, the ultrasonic transducer is placed in the transducer mounting part, and the end of the transducer mounting part is connected to a fastening pressing plate having a first through hole through bolts.

[0026] In this embodiment, the purpose of setting the air leakage hole is to make the gas pressure inside and outside the metering pipe equal, so that the gas pressure inside and outside the ultrasonic transducer installed on the embedded metering pipe can be equal. At the same time, since the present application adopts a double-layer pipe structural design, an air leakage hole can be set on the metering pipe. The setting position and shape of the air leakage hole are not particularly limited, so the position and shape of the air leakage hole in the drawings of the specification should not limit the protection scope of this application. On the premise of meeting the above purpose, other changes can be made, for example: setting the air leakage hole at the end of the metering pipe, or setting the air leakage hole on the side wall of the metering pipe, or setting the air leakage hole on the metering pipe between the two transducer mounting parts, etc.

[0027] It should be noted that the accompanying drawings only show one installation position of the ultrasonic transducer. According to needs, technical personnel in this field can also choose other installation positions, for example: V-type, Z-type, W-type, L-type, oblique, etc., which should also fall within the scope of protection of this application.

[0028] Through the above-mentioned arrangement, the gas pressures on the inner and outer sides of the ultrasonic transducer installed on the embedded metering pipe are equal, that is, there is no pressure difference. In this way, the low-pressure resistant ultrasonic transducer installed on the embedded metering pipe can be used to measure the flow of high-pressure gas, thereby significantly reducing the production cost of the ultrasonic transducer. In the total production cost of the ultrasonic gas flowmeter, the production cost of the ultrasonic transducer accounts for a large proportion, and the cost of the newly added embedded metering pipe is much lower than the production cost of the high-pressure resistant ultrasonic transducer. Therefore, the present invention significantly reduces the production cost of the ultrasonic flowmeter.

[0029] According to the technical solution disclosed in this embodiment, the ultrasonic transducer does not need to be encapsulated with a stainless steel or other high-hardness shell. Since the low-pressure ultrasonic transducer at the transmitting end has no metal shell, the attenuation of the transmitted signal is small. Therefore, the intensity of the ultrasonic signal to be transmitted is much smaller than the signal intensity required to be transmitted by the high-pressure ultrasonic transducer with a metal shell on the traditional ultrasonic flowmeter, and the required excitation voltage and current of the ultrasonic transducer are significantly reduced. Therefore, the present application greatly reduces the rated voltage and power consumption of the ultrasonic flowmeter and improves the explosion-proof safety performance of the product. On the other hand, since the low-pressure ultrasonic transducer at the receiving end has no metal shell, the attenuation of the received ultrasonic signal is small, and the signal-to-noise ratio of the received signal is much higher than that of the traditional ultrasonic flowmeter. Since the higher the signal-to-noise ratio of the received signal, the higher the metering accuracy, for the same gas medium, the metering accuracy of the present application is better than that of the traditional ultrasonic gas flowmeter.

[0030] In a further preferred embodiment, different from the prior art, based on the above structural setting, this embodiment is also integrated with a temperature and pressure sensor on the metering pipeline. Specifically, a circuit board installation cavity is provided on the side of the metering pipeline, which is an integral structure with the metering pipeline, an ultrasonic metering circuit board is installed in the circuit board installation cavity, and a temperature and pressure sensor is integrated on the ultrasonic metering circuit board. The circuit board installation cavity is sealed by a cover plate, and the two can be connected by bolts, and a second through hole is provided on the cover plate, and the temperature and pressure sensor is exposed through the second through hole. Through the above setting, there is no need to open a mounting hole on the outer layer of the pipeline to install the temperature and pressure sensor like a traditional ultrasonic flow meter, thereby significantly reducing the cost and volume of the flow meter.

[0031] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. An ultrasonic gas flow meter, characterized in that: The invention comprises an outer layer pipe (10), an embedded metering pipe (11) embedded in the outer layer pipe (10), and a rectifier (12) arranged at one end of the outer layer pipe (10); the embedded metering pipe (11) comprises a metering pipe (111), an air leakage hole (112) arranged on the metering pipe (111), a transducer mounting portion (113) arranged on the metering pipe (111) and connected to the inside of the metering pipe (111), an ultrasonic transducer (114) mounted via the transducer mounting portion (113), and a temperature and pressure sensor (115) integrated on the metering pipe (111).

2. The ultrasonic gas flow meter according to claim 1, characterized in that: The outer layer pipe (10) comprises a first outer layer pipe (101) and a second outer layer pipe (102) connected by flanges, the left end of the first outer layer pipe (101) being provided with a connection flange and the rectifier (12) being mounted on the end, the right end of the second outer layer pipe (102) being provided with a connection flange, and a display mechanism being provided on the side of the second outer layer pipe (102).

3. The ultrasonic gas flow meter according to claim 2, characterized in that: The ultrasonic transducer (114) is placed in the transducer mounting portion (113), and the end of the transducer mounting portion (113) is connected to a fastening pressing sheet (117) having a first through hole (116) via bolts.

4. The ultrasonic gas flow meter according to claim 3, characterized in that: A circuit board installation cavity (118) is provided on the side of the metering pipe (111), an ultrasonic metering circuit board (119) is installed in the circuit board installation cavity (118), and the temperature and pressure sensor (115) is arranged on the ultrasonic metering circuit board (119).

5. The ultrasonic gas flow meter according to claim 4, characterized in that: The circuit board installation cavity (118) is covered by a cover plate (120), and a second through hole (121) is provided on the cover plate (120), and the temperature and pressure sensor (115) is exposed through the second through hole (121).

6. The ultrasonic gas flow meter according to claim 5, characterized in that: The display mechanism comprises a connector and a cable (13) mounted on the second outer layer pipe (102), and a display box (15) fixed on the second outer layer pipe (102) via a display box base (14).

7. The ultrasonic gas flow meter according to claim 6, characterized in that: The first outer layer pipe (101), the second outer layer pipe (102) and the metering pipe (111) are coaxially arranged.

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