Gas ultrasonic flowmeter

Abstract

The utility model provides a gas ultrasonic flowmeter. The gas ultrasonic flowmeter is characterized by comprising a measuring pipeline, a rectifying assembly, at least one pair of ultrasonic transducers and a meter head, the rectifying assembly is fixed in the inlet end of the measuring pipeline, the rectifying assembly comprises a rectifying sleeve, a spiral generator and at least one honeycomb rectifier, at least one pair of transducer mounting pipes communicated with the measuring pipeline is arranged on the measuring pipeline, a fastener is arranged in each transducer mounting pipe, and the honeycomb rectifier is connected with the transducer mounting pipes. The fasteners are detachably installed on the transducer installation pipes, each fastener is provided with an ultrasonic transducer, and all the ultrasonic transducers are communicated with the meter head. The gas ultrasonic rectifying assembly has the beneficial effects that the gas ultrasonic rectifying assembly can keep a gas flow field stable at a measurement pipeline section, and the stability and the accuracy of a measurement result of an ultrasonic transducer are improved. And meanwhile, the ultrasonic transducer can be conveniently and quickly disassembled and is regularly maintained and cleaned, so that the service life of the ultrasonic transducer is prolonged, and the metering precision in long-term use is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid flow measurement, in particular to a gas ultrasonic flow meter. Background Art

[0002] Ultrasonic flowmeter is a process control instrument that uses the principle of ultrasonic time difference method to detect and measure gas flow. Gas ultrasonic flowmeter has high accuracy, wide measurement range, no pressure loss caused by flow resistance components, can measure flow in both directions, can measure steady-state and low-frequency pulsating airflow, is suitable for various pipeline diameters, and can use flow computers to measure changes in gas temperature and pressure in the pipeline. Gas ultrasonic flowmeter is mainly used for flow measurement of various gases, including natural gas, coal gas and other combustible gases, and can also reliably measure gases such as air and nitrogen.

[0003] In the prior art, the flow field of the tested gas in the measuring pipe section of the flow meter is not stable, so the measured readings fluctuate within a large range and the accuracy of the measurement results is not high. For example, patent CN208536931U discloses a reflective multi-channel ultrasonic gas flow meter flow channel, in which a guide ring and a honeycomb gas rectification structure are arranged at the entrance of the straight pipe channel of the flow meter, so that the anisotropic chaotic flow at the front end of the flow channel is rectified into an effective flow parallel to the axis of the flow channel. However, the rectified gas is still not uniform enough and the gas distribution is not ideal.

[0004] At the same time, the ultrasonic transducers used in existing gas ultrasonic flow meters are directly assembled inside the shell, which is not easy to disassemble and clean. When the gas in the pipeline is dirty, it is easy to accumulate on the surface of the transducer, affecting the measurement accuracy. Utility Model Content

[0005] In view of this, in order to improve the accuracy and stability of ultrasonic flowmeters in measuring pipeline gas flow and improve the convenience of cleaning the ultrasonic transducer therein, the utility model provides a gas ultrasonic flowmeter, which is characterized by comprising a measuring pipeline, a rectifier component, at least one pair of ultrasonic transducers and a meter head;

[0006] The measuring pipe is a hollow circular tube, and its two ends are respectively an inlet end and an outlet end; the meter head is connected to the measuring pipe;

[0007] The rectifying assembly is fixed in the inlet end of the measuring pipeline, and the rectifying assembly includes a rectifying sleeve, a vortexer and at least one honeycomb rectifier, and the vortexer and the honeycomb rectifier are fixedly arranged in the rectifying sleeve in sequence along the flow direction of the fluid in the measuring pipeline;

[0008] The measuring pipeline is provided with at least one pair of transducer mounting tubes connected to the measuring pipeline, each of the transducer mounting tubes is provided with a fastener, the fastener is detachably mounted on the transducer mounting tube, each fastener is provided with an ultrasonic transducer, and the at least one pair of ultrasonic transducers is electrically connected to the meter head.

[0009] Furthermore, the rotator comprises a fixed ring and a plurality of rotator blades rotatably and obliquely arranged on the fixed ring, and the honeycomb rectifier is provided with a plurality of honeycomb rectifier holes arranged along the axial direction of the measuring pipeline.

[0010] Furthermore, there are two honeycomb rectifiers, which are respectively a first honeycomb rectifier and a second honeycomb rectifier. Both the first honeycomb rectifier and the second honeycomb rectifier are fixed in the rectifier sleeve, and a buffer gap is provided between the first honeycomb rectifier and the second honeycomb rectifier.

[0011] Furthermore, a connecting shaft is provided below the meter head, the lower end of the connecting shaft is connected to the measuring pipe, and the meter head is rotatably connected to the upper end of the connecting shaft.

[0012] Furthermore, a sewage outlet is provided at the lowest point in the middle of the measuring pipeline, and a sewage outlet plug is provided in the sewage outlet.

[0013] Furthermore, a connecting ring is fixedly provided at the end of the fairing sleeve, a position avoidance hole is provided in the middle of the connecting ring, and the connecting ring is fixed on the inlet end face of the measuring pipe.

[0014] Furthermore, the number of the transducer mounting tubes is two pairs, the two transducer mounting tubes of each pair of transducer mounting tubes are coaxially arranged, and the two pairs of transducer mounting tubes are relatively arranged up and down.

[0015] Furthermore, the fastener is a threaded block, the outer wall of the threaded block is provided with an external thread, the inner wall of the transducer mounting tube is provided with an internal thread, and the threaded block is connected to the transducer mounting tube through threads. A seal is also provided between the ultrasonic transducer and the threaded block, and the seal seals the transducer mounting tube.

[0016] Furthermore, a closing cover is provided at the end of the transducer mounting tube, and the closing cover is connected to the inner wall of the end of the transducer mounting tube through threads.

[0017] Furthermore, two sensor installation tubes are provided on the measuring pipeline, both of which are connected to the measuring pipeline. Temperature sensors and pressure sensors are respectively provided in the two sensor installation tubes, and the temperature sensors and pressure sensors are respectively used to correct the temperature and pressure of the fluid in the measuring pipeline.

[0018] The utility model has the following beneficial effects: the gas ultrasonic flowmeter comprises a measuring pipeline, a rectifying assembly, an ultrasonic transducer, and a meter head, wherein a processor and a display are arranged in the meter head; the rectifying assembly is fixed in the inlet end of the measuring pipeline, the rectifying assembly comprises a rectifying sleeve, a vortexer, and a honeycomb rectifier, wherein the vortexer and the honeycomb rectifier are successively fixedly arranged in the rectifying sleeve along the flow direction of the fluid in the measuring pipeline; the measuring pipeline is provided with transducer mounting tubes arranged in pairs, each of the transducer mounting tubes is provided with a fastener, the fastener is detachably mounted on the transducer mounting tube, each fastener is provided with an ultrasonic transducer, all ultrasonic transducers are connected to the processor, and the processor is connected to the display. When the gas ultrasonic flowmeter is used, the gas in the measuring pipeline flows from the inlet end to the outlet end, and when the gas passes through the rectifying assembly, the gas is dispersed after passing through the vortexer, and after passing through the honeycomb rectifier, the gas flow field remains stable in the measuring pipeline section, thereby making the gas flow rate values ​​measured and calculated by the ultrasonic transducer and the processor remain stable and accurate. And the measuring pipe can quickly discharge the moisture and oil accumulated in the measuring pipe when the gas ultrasonic flowmeter stops working. At the same time, the ultrasonic transducer is connected to the transducer installation pipe in a threaded manner through fasteners. When the ultrasonic transducer is maintained and cleaned, it is only necessary to remove the closing cover and fasteners on the transducer installation pipe to remove the ultrasonic transducer, so as to conveniently and quickly perform regular maintenance and cleaning of the ultrasonic transducer, extend its service life, and improve its measurement accuracy in long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a first overall structural schematic diagram of a gas ultrasonic flowmeter according to an embodiment of the utility model.

[0020] Figure 2 This is a second overall structural schematic diagram of a gas ultrasonic flowmeter according to an embodiment of the utility model.

[0021] Figure 3 yes Figure 1 Cross-sectional view at AA in the middle.

[0022] Figure 4 yes Figure 3 Enlarged view of point B in the middle.

[0023] Figure 5 It is a structural schematic diagram of the main body of a rectifier component of a gas ultrasonic flow meter according to an embodiment of the utility model.

[0024] In the above figure: 1-measuring pipe, 11-connecting flange, 12-drain outlet, 2-connecting shaft, 3-meter head, 4-display, 5-rectifier sleeve, 51-connecting ring, 52-rotator, 53-first honeycomb rectifier, 54-second honeycomb rectifier, 55-buffer gap, 6-transducer mounting tube, 61-closing cover, 7-ultrasonic transducer, 8-fastener, 81-seal. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present utility model clearer, the implementation mode of the present utility model will be further described below in conjunction with the accompanying drawings.

[0026] Please refer to Figures 1 to 5 The utility model discloses a gas ultrasonic flow meter, comprising a measuring pipe, a rectifier assembly, an ultrasonic transducer 7, and a meter head 3. The meter head 3 is provided with a processor and a display 4. The processor is located in the meter head 3, and the display 4 is embedded in the surface of the meter head 3.

[0027] The measuring pipe 1 is a hollow circular tube, and its two ends are respectively an inlet end and an outlet end. Both ends of the measuring pipe 1 are provided with connecting flanges 11. When the measuring pipe 1 is in use, it is connected to the gas delivery pipe through the two connecting flanges 11. The rectifying assembly is fixed in the inlet end of the measuring pipe 1. Specifically, the rectifying assembly includes a rectifying sleeve 5, a rotator 52 and at least one honeycomb rectifier. The rotator 52 and the honeycomb rectifier are fixedly arranged in the rectifying sleeve 5 along the flow direction of the fluid in the measuring pipe 1 in sequence. In this embodiment, a connecting ring 51 is fixedly arranged at the end of the rectifying sleeve 5, and a position avoidance hole is arranged in the middle of the connecting ring 51. The outer diameter of the connecting ring 51 is larger than the outer diameter of the rectifying sleeve 5, and the inner diameter of the connecting ring 51 is smaller than the outer diameter of the rectifying sleeve 5. The connecting ring 51 is fixed to the inlet end face of the measuring pipe 1 by screws. The rotator 52 includes a fixing ring and a plurality of rotator blades arranged rotatably and obliquely on the fixing ring. The honeycomb rectifier is provided with a plurality of honeycomb rectifying holes arranged along the axial direction of the measuring pipe 1. There are two honeycomb rectifiers, which are respectively a first honeycomb rectifier 53 and a second honeycomb rectifier. The first honeycomb rectifier 53 and the second honeycomb rectifier 54 are both fixed in the rectifying sleeve 5, and a buffer gap 55 is provided between the first honeycomb rectifier 53 and the second honeycomb rectifier 54. The rectifying sleeve 5 is used to keep the flow field of the gas in the measuring pipe 1 stable when the gas flows through the measuring pipe 1 section.

[0028] The measuring pipeline 1 is provided with at least one pair of transducer mounting tubes 6 connected with the measuring pipeline 1, each of the transducer mounting tubes 6 is provided with a fastener 13, the fastener 13 is detachably mounted on the transducer mounting tube 6, each fastener 13 is provided with an ultrasonic transducer, all ultrasonic transducers 7 are connected to the processor, and the processor is connected to the display 4. Specifically, the number of the transducer mounting tubes 6 is two pairs, the two transducer mounting tubes 6 of each pair of transducer mounting tubes 6 are coaxially arranged, and the two pairs of transducer mounting tubes 6 are relatively arranged up and down, and the axes of the two transducer mounting tubes 6 of each pair of transducer mounting tubes 6 are inclined relative to the axis of the measuring pipeline 1, and the transducer mounting tubes 6 include two pairs of transducer mounting tubes 6 that can simultaneously measure the gas flow velocity at different heights of the measuring cross section in the measuring pipeline 1, thereby reducing the flow measurement error caused by the different gas flow velocities at different positions of the measuring cross section in the measuring pipeline 1.

[0029] The fastener 13 is a threaded block, the outer wall of the threaded block is provided with an external thread, the outer end of the threaded block is provided with a tightening structure, the inner wall of the transducer mounting tube 6 is provided with an internal thread, and the threaded block is connected to the transducer mounting tube 6 by threads. A sealing member 81 is also provided between the ultrasonic transducer 7 and the threaded block, and the sealing member 81 seals the transducer mounting tube 6. A closing cover 61 is also provided at the end of the transducer mounting tube 6, and the closing cover 61 is connected to the inner wall of the end of the transducer mounting tube 6 by threads. After removing the closing cover 61, the threaded block can be directly removed from the transducer mounting tube by a wrench or a socket matching its tightening structure, so that the ultrasonic transducer 7 can be cleaned and maintained without disassembling the measuring pipeline 1.

[0030] A meter head 3 is provided above the measuring pipeline 1, and the meter head 3 is rotatably arranged on the measuring pipeline 1 through a connecting shaft 2. The processor is located in the meter head 3, and the display 4 is embedded in the surface of the meter head 3. The processor includes a signal processing unit and a flow calculation module. The signal processing unit is electrically connected to all ultrasonic transducers, and the signal processing unit is connected to the flow calculation module and the display 4. The signal processing unit is used to receive and process the signal measured by the ultrasonic transducer 7, and the flow calculation module is used to calculate the gas flow in the measuring pipeline 1 through the processed signal and display it through the display 4. The process of the processor using a pair of ultrasonic transducers to measure the pipeline gas flow is a prior art, and its principle is not specifically introduced here.

[0031] The measuring pipeline 1 is also provided with two sensor mounting tubes connected to the measuring pipeline, and a temperature sensor and a pressure sensor are fixed in the two sensor mounting tubes respectively. The temperature sensor and the pressure sensor are both connected to the display 4 on the meter head 3. The temperature sensor and the pressure sensor are respectively used to correct the temperature and pressure of the fluid in the measuring pipeline.

[0032] Preferably, a sewage outlet 12 is provided at the lowest point in the middle of the measuring pipeline 1 , and a sewage outlet plug is provided in the sewage outlet 12 . The sewage outlet 12 is used to quickly discharge moisture and oil carried in the gas accumulated in the measuring pipeline 1 .

[0033] The working process of a gas ultrasonic flow meter of the utility model is as follows: a measuring pipeline 1 of the gas ultrasonic flow meter is connected to a gas flow pipeline, the gas in the measuring pipeline 1 flows from an inlet end to an outlet end, when the gas passes through a rectifying component, the gas is dispersed after passing through a swirler, and after passing through two honeycomb rectifiers, the gas flow field remains stable in a section 1 of the measuring pipeline, one ultrasonic transducer in each pair of ultrasonic transducers serves as an ultrasonic transmitting end, and the other ultrasonic transducer serves as an ultrasonic receiving end, the ultrasonic transmitting end transmits ultrasonic waves to the ultrasonic receiving end, and the processor calculates the gas flow rate in the pipeline through the time difference between the transmission and reception of the ultrasonic transmitting end and the ultrasonic receiving end, and displays the calculated flow rate on a display.

[0034] When the gas ultrasonic flowmeter is in normal use, the sewage outlet of the measuring pipe 1 is blocked by the sewage plug. After the gas ultrasonic flowmeter stops working, the sewage outlet can be opened by opening the plug to discharge the water and oil accumulated in the measuring pipe 1. At the same time, the ultrasonic transducer 7 is connected to the transducer mounting tube 6 in a threaded manner through the fastener 13. When the ultrasonic transducer 7 is maintained and cleaned, it is only necessary to remove the closing cover 61 on the transducer mounting tube 6 and the fastener 13 to remove the ultrasonic transducer 7, so that the ultrasonic transducer 7 can be maintained and cleaned regularly and quickly, thereby extending the service life and improving the measurement accuracy in long-term use.

[0035] In this document, the directional words such as front, back, top, and bottom are defined by the positions of the components in the drawings and the positions of the components relative to each other, and are only for the sake of clarity and convenience in expressing the technical solution. It should be understood that the use of the directional words should not limit the scope of protection claimed in this application.

[0036] In the absence of conflict, the above embodiments and features in the embodiments may be combined with each other.

[0037] The above description is only a preferred embodiment of the present invention and is 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, characterized in that: It includes a measuring pipe, a rectifying assembly, at least one pair of ultrasonic transducers and a meter head; The measuring pipe is a hollow circular tube, and its two ends are respectively an inlet end and an outlet end; the meter head is connected to the measuring pipe; The rectifying assembly is fixed in the inlet end of the measuring pipeline, and the rectifying assembly includes a rectifying sleeve, a vortexer and at least one honeycomb rectifier, and the vortexer and the honeycomb rectifier are fixedly arranged in the rectifying sleeve in sequence along the flow direction of the fluid in the measuring pipeline; The measuring pipeline is provided with at least one pair of transducer mounting tubes connected to the measuring pipeline, each of the transducer mounting tubes is provided with a fastener, the fastener is detachably mounted on the transducer mounting tube, each fastener is provided with an ultrasonic transducer, and the at least one pair of ultrasonic transducers is electrically connected to the meter head.

2. A gas ultrasonic flowmeter according to claim 1, characterized in that: The rotator comprises a fixed ring and a plurality of rotator blades rotatably and obliquely arranged on the fixed ring. The honeycomb rectifier is provided with a plurality of honeycomb rectifier holes arranged along the axial direction of the measuring pipeline.

3. A gas ultrasonic flowmeter according to claim 2, characterized in that: There are two honeycomb rectifiers, which are respectively a first honeycomb rectifier and a second honeycomb rectifier. Both the first honeycomb rectifier and the second honeycomb rectifier are fixed in the rectifier sleeve, and a buffer gap is provided between the first honeycomb rectifier and the second honeycomb rectifier.

4. A gas ultrasonic flow meter according to claim 1, characterized in that: A connecting shaft is provided below the meter head, the lower end of the connecting shaft is connected to the measuring pipeline, and the meter head is rotatably connected to the upper end of the connecting shaft.

5. A gas ultrasonic flowmeter according to claim 1, characterized in that: A sewage outlet is provided at the lowest point in the middle of the measuring pipeline, and a sewage outlet plug is provided in the sewage outlet.

6. A gas ultrasonic flowmeter according to claim 1, characterized in that: A connecting ring is fixedly provided at the end of the fairing sleeve, a position avoidance hole is provided in the middle of the connecting ring, and the connecting ring is fixed on the inlet end face of the measuring pipeline.

7. A gas ultrasonic flow meter according to claim 1, characterized in that: The number of the transducer mounting tubes is two pairs, the two transducer mounting tubes of each pair of transducer mounting tubes are coaxially arranged, and the two pairs of transducer mounting tubes are relatively arranged up and down.

8. A gas ultrasonic flowmeter according to claim 1, characterized in that: The fastener is a threaded block, the outer wall of the threaded block is provided with external threads, the inner wall of the transducer mounting tube is provided with internal threads, the threaded block is connected to the transducer mounting tube through threads, and a seal is also provided between the ultrasonic transducer and the threaded block, and the seal seals the transducer mounting tube.

9. A gas ultrasonic flow meter according to claim 8, characterized in that: The end of the transducer installation tube is also provided with a closing cover, and the closing cover is connected to the inner wall of the end of the transducer installation tube through threads.

10. A gas ultrasonic flow meter according to claim 1, characterized in that: The measuring pipeline is also provided with two sensor installation tubes, both of which are connected to the measuring pipeline. The two sensor installation tubes are respectively provided with a temperature sensor and a pressure sensor, and the temperature sensor and the pressure sensor are respectively used to correct the temperature and pressure of the fluid in the measuring pipeline.

Images