Gas ultrasonic flowmeter

Abstract

According to the technical scheme, the gas ultrasonic flowmeter is characterized by comprising a fluid director shell, and a fluid director is arranged in the fluid director shell; one end of the flow guide body is arc-shaped, and the other end of the flow guide body is open; an air inlet is formed in the flow guide body; a spiral generator is arranged in the straight pipe section; one side of the straight pipe section is connected with the detection section; a rectifier is arranged in the detection section; a distance is formed between the spiral flow generator and the rectifier; the flow guide body can rectify the airflow for the first time; the spiral flow generator enables air flow to spirally flow at a certain angle, and when the air flow passes through the honeycomb rectifier, the air flow can become more uniform and stable, so that the air flow can be stabilized conveniently; the pressure sensor and the temperature sensor are located at the rear end of the rectifier, so that airflow is in a stable state when passing through a detection section at the rear end of the rectifier, and metering accuracy is high; the gas metering device has the advantages of being high in metering accuracy, good in repeatability and capable of stabilizing gas flow conveniently.

Description

Technical Field

[0001] This utility model relates to a flow meter, and more specifically to a gas ultrasonic flow meter. Background Technology

[0002] Ultrasonic gas flow meters, also known as gas ultrasonic flow meters, are process control instruments capable of detecting and measuring gas flow. They are primarily used for measuring the flow of various gases, including natural gas, coal gas, coke oven gas, water gas, coal gas, coalbed methane, gas, flare gas, biogas, hydrogen, and other combustible gases. They can also reliably measure special gases such as air, nitrogen, and inert gases. Currently, some flow meters suffer from inaccurate measurement due to unstable airflow during detection; therefore, a new flow meter is urgently needed to meet these user needs. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this utility model provides a gas ultrasonic flow meter that features high measurement accuracy, good repeatability, and ease of stabilizing airflow.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a gas ultrasonic flow meter, comprising a flow guide housing, wherein a flow guide fluid is disposed within the flow guide housing; one end of the flow guide fluid is arc-shaped and the other end is open; an air inlet is provided on the flow guide fluid; the flow guide housing is connected to a straight pipe section; a swirl starter is disposed on the side of the straight pipe section near the flow guide housing; one side of the straight pipe section is connected to a detection section; a rectifier is disposed within the detection section; there is a distance between the swirl starter and the rectifier; a detection instrument is disposed on the detection section; the detection instrument includes a pressure sensor, a temperature sensor, and an ultrasonic sensor.

[0005] The present invention is further configured such that: the diameter of the end of the guide shell away from the straight pipe section is smaller than the diameter of the end near the straight pipe section; the end of the guide that is away from the arc shape is in contact with the swirl starter.

[0006] The present invention is further configured such that: the swirl starter has fan blades; the fan blades rotate when the gas passes through; and the rectifier is located at one end of the detection section near the straight pipe section.

[0007] The present invention is further configured such that: a first sealing ring is provided between the flow guide housing and the straight pipe section; a second sealing ring is provided between the straight pipe section and the detection section; and the flow guide housing and the straight pipe section, as well as the straight pipe section and the detection section, are all fixedly connected by screws.

[0008] The present invention is further configured such that the rectifier is honeycomb-shaped.

[0009] The present invention is further configured such that: one end of the pressure sensor and one end of the temperature sensor are both located within the detection section; the ultrasonic sensor is located within the detection section.

[0010] In summary, this utility model has the following beneficial effects: one end of the guide fluid is arc-shaped and an air inlet is provided on the guide fluid, which can rectify the airflow for the first time; the fan blades in the vortex generator cause the airflow to flow in a spiral at a certain angle when the airflow passes through; when the airflow passes through the rectifier, the honeycomb structure design of the rectifier makes the airflow more uniform and stable, which facilitates the stabilization of the airflow; the pressure sensor and temperature sensor are located at the rear end of the rectifier, so that the airflow is in a stable state when the airflow passes through the detection section at the rear end of the rectifier, which makes the measurement accuracy high and the repeatability good. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this embodiment;

[0012] Figure 2 yes Figure 1 Enlarged view of part A;

[0013] Figure 3 This is a schematic diagram of the swivel initiator in this embodiment.

[0014] Reference numerals in the attached drawings: 1. Flow guide housing; 2. Flow guide; 3. Air inlet; 4. Straight pipe section; 5. Swirler; 6. Detection section; 7. Rectifier; 8. Detection instrument; 9. Pressure sensor; 10. Temperature sensor; 11. Ultrasonic sensor; 12. Fan blade; 13. First sealing ring; 14. Second sealing ring; 15. Screw. Detailed Implementation

[0015] The present invention will be further described in detail below with reference to the accompanying drawings.

[0016] This embodiment discloses a gas ultrasonic flow meter, such as Figures 1 to 3 As shown, this utility model has the advantages of high measurement accuracy, good repeatability, and easy stabilization of airflow. It includes a flow guide housing 1, in which a flow guide 2 is disposed; one end of the flow guide 2 is arc-shaped and the other end is open; an air inlet 3 is provided on the flow guide 2; the flow guide housing 1 is connected to a straight pipe section 4; a swirl starter 5 is provided on the side of the straight pipe section 4 near the flow guide housing 1; one side of the straight pipe section 4 is connected to a detection section 6; a rectifier 7 is disposed in the detection section 6; there is a distance between the swirl starter 5 and the rectifier 7; a detection instrument 8 is disposed on the detection section 6; the detection instrument 8 includes a pressure sensor 9, a temperature sensor 10, and an ultrasonic sensor 11.

[0017] By adopting the above technical solution: the guide fluid 2 is set inside the guide housing 1. One end of the guide fluid 2 is arc-shaped. The part of the guide fluid 2 with the air inlet 3 is cylindrical and hollow inside. The opening at one end of the guide fluid 2 allows the airflow to flow along the arc-shaped end of the guide fluid 2 to the cylindrical surface of the guide fluid 2 when it enters the guide housing 1, and then enters the guide fluid 2 through the air inlet 3. The gas is rectified for the first time by the guide fluid 2.

[0018] When the airflow passes through the vortex generator 5, the fan blades 12 inside the vortex generator 5 perform a second rectification of the airflow, making the airflow spiral. Because there is a distance between the vortex generator 5 and the rectifier 7, the airflow is fully spiraled between the vortex generator 5 and the rectifier 7, forming turbulence. The high inertial force characteristics of turbulence can avoid abrupt changes in the flow pattern caused by small disturbances in laminar flow, making it more stable. The pressure sensor 9 and the temperature sensor 10 are located at the rear end of the rectifier 7, so that the airflow is in a stable state when it passes through the detection section 6 at the rear end of the rectifier 7, thus making the measurement accuracy high and the repeatability good. The pressure sensor 9 can detect the airflow pressure, the temperature sensor 10 can detect the temperature, and the ultrasonic sensor 11 can measure the propagation time difference or frequency change of the ultrasonic signal in the gas to calculate the flow velocity and flow rate, thus making the measurement accuracy high.

[0019] like Figure 1 As shown, the diameter of the end of the guide housing 1 away from the straight pipe section 4 is smaller than the diameter of the end near the straight pipe section 4; the end of the guide fluid 2 away from the arc shape is in contact with the swirl generator 5.

[0020] By adopting the above technical solution: the diameter of the end of the guide tube housing 1 away from the straight pipe section 4 is smaller than the diameter of the end near the straight pipe section 4, so that the airflow can flow through the arc-shaped end of the guide tube 2 to the cylindrical surface of the guide tube 2; the end of the guide tube 2 away from the arc shape is in contact with the swirl generator 5, so that the airflow immediately enters the swirl generator 5 after leaving the guide tube 2, and the swirl generator 5 rectifies the airflow a second time, so that the airflow flows in a spiral at a certain angle.

[0021] like Figure 3 As shown, the swirl starter 5 contains a fan blade 12; the rectifier 7 is located at one end of the detection section 6 near the straight pipe section 4.

[0022] By adopting the above technical solution: after the airflow passes through the fan blade 12, the fan blade 12 can perform secondary rectification of the airflow so that the airflow flows in a spiral at a certain angle; since there is a distance between the rectifier 7 and the swirl generator 5, the airflow is fully spiraled between the swirl generator 5 and the rectifier 7, forming turbulence.

[0023] like Figure 1 , Figure 2As shown, a first sealing ring 13 is provided between the flow guide housing 1 and the straight pipe section 4; a second sealing ring 14 is provided between the straight pipe section 4 and the detection section 6; the flow guide housing 1 and the straight pipe section 4, and the straight pipe section 4 and the detection section 6 are all fixedly connected by screws 15.

[0024] By adopting the above technical solution: the first sealing ring 13 ensures a good sealing effect between the flow guide housing 1 and the straight pipe section 4, the second sealing ring 14 ensures a good sealing effect between the straight pipe section 4 and the detection section 6; and the screw 15 ensures a stable connection between the flow guide housing 1 and the straight pipe section 4, and between the straight pipe section 4 and the detection section 6.

[0025] like Figure 1 As shown, the rectifier 7 is honeycomb-shaped.

[0026] By adopting the above technical solution: the rectifier 7 is honeycomb-shaped and has a certain thickness. The honeycomb structure design makes the airflow more uniform and stable when the airflow passes through the honeycomb structure, thus facilitating subsequent testing.

[0027] like Figure 1 As shown, one end of the pressure sensor 9 and the temperature sensor 10 are both located within the detection section 6; the ultrasonic sensor 11 is located within the detection section 6.

[0028] By adopting the above technical solution: one end of the pressure sensor 9 and the temperature sensor 10 are both located within the detection section 6, which facilitates the detection of airflow pressure and temperature; the ultrasonic sensor 11 is completely located within the detection section 6, which facilitates the detection of airflow flow rate and velocity.

[0029] In summary, this utility model has the following beneficial effects: one end of the guide fluid 2 is arc-shaped and an air inlet 3 is provided on the guide fluid 2, which can rectify the airflow for the first time; the fan blades 12 in the swirl generator 5 cause the airflow to flow in a spiral at a certain angle when the airflow passes through; when the airflow passes through the rectifier 7, the rectifier 7 adopts a honeycomb structure design, and the small channels of the honeycomb can make the airflow more uniform and stable, thus facilitating the stabilization of the airflow; the pressure sensor 9 and the temperature sensor 10 are located at the rear end of the rectifier 7, which can make the measurement accuracy high and the repeatability good.

[0030] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the design concept of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A gas ultrasonic flow meter, comprising a flow guide housing (1), characterized in that: The guide body (1) is provided with a guide fluid (2); one end of the guide fluid (2) is arc-shaped and the other end is open; an air inlet (3) is provided on the guide fluid (2); the guide body (1) is connected to a straight pipe section (4); a swirl starter (5) is provided on the side of the straight pipe section (4) near the guide body (1); one side of the straight pipe section (4) is connected to a detection section (6); a rectifier (7) is provided in the detection section (6); there is a distance between the swirl starter (5) and the rectifier (7); a detection instrument (8) is provided on the detection section (6); the detection instrument (8) includes a pressure sensor (9), a temperature sensor (10), and an ultrasonic sensor (11).

2. The gas ultrasonic flow meter according to claim 1, characterized in that: The diameter of the end of the guide housing (1) away from the straight pipe section (4) is smaller than the diameter of the end near the straight pipe section (4); the end of the guide fluid (2) away from the arc shape is in contact with the swirl generator (5).

3. The gas ultrasonic flow meter according to claim 2, characterized in that: The swirl starter (5) is fixedly equipped with a fan blade (12); the rectifier (7) is located at one end of the detection section (6) near the straight pipe section (4).

4. The gas ultrasonic flow meter according to claim 3, characterized in that: A first sealing ring (13) is provided between the flow guide housing (1) and the straight pipe section (4); a second sealing ring (14) is provided between the straight pipe section (4) and the detection section (6); the flow guide housing (1) and the straight pipe section (4), and the straight pipe section (4) and the detection section (6) are all fixedly connected by screws (15).

5. The gas ultrasonic flow meter according to claim 4, characterized in that: The rectifier (7) is honeycomb-shaped.

6. The gas ultrasonic flow meter according to claim 1, characterized in that: The pressure sensor (9) and temperature sensor (10) are both located within the detection section (6); the ultrasonic sensor (11) is located within the detection section (6).

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