Ultrasonic flowmeter with purging and metering maintaining functions

Abstract

The utility model discloses an ultrasonic flowmeter with purging and metering maintaining functions. The ultrasonic flowmeter comprises an air source, a purging pipe, a first quick cut-off valve, a U-shaped pipe, a second quick cut-off valve, an organic solvent tank, a third quick cut-off valve, an ultrasonic flowmeter sensor, an iron sheet door, a probe and a system controller. The purging pipe is a straight pipe, a quick cut-off valve is arranged on a pipe body, the air inlet end of the purging pipe is connected with an air source, and the air outlet end of the purging pipe is bent towards the probe; openings are formed in pipe bodies of the purging pipes on the two sides of the quick cut-off valve and are connected through a U-shaped pipe; an organic solvent tank is arranged on a pipe body of the U-shaped pipe, and quick cut-off valves are arranged on the pipe body of the U-shaped pipe on the two sides of the organic solvent tank. Under the control of the system controller, the organic solvent is automatically pressed into the blowing pipe at regular time and is blown, and meanwhile, metering is performed according to a signal before blowing during blowing, so that the influence on data statistics due to flow metering fluctuation during blowing can be prevented.

Description

Technical Field

[0001] The utility model belongs to an ultrasonic flow meter, in particular to an ultrasonic flow meter with self-purge and metering retention. Background Art

[0002] Insertable ultrasonic gas flowmeters are currently widely used in China. However, after a period of use, the complex composition and heavy contamination of gas can lead to probe scaling, affecting measurement accuracy. This requires online probe cleaning, and untimely maintenance can affect flowmeter accuracy. Gas spills during online maintenance pose a safety hazard. Using existing online purge technology can result in data fluctuations during the purge. Utility Model Content

[0003] Purpose of the utility model: In order to solve the problems existing in the prior art, the utility model provides an ultrasonic flow meter with self-purging and metering retention, so as to realize automatic purging of the ultrasonic flow meter and keep the metering data normal during purging.

[0004] The utility model is realized through the following technical solutions:

[0005] An ultrasonic flowmeter with self-purging and metering maintenance includes an air source, a purge pipe, a first quick shut-off valve, a U-shaped tube, a second quick shut-off valve, an organic solvent tank, a third quick shut-off valve, an ultrasonic flowmeter sensor, and a probe. The ultrasonic flowmeter sensor is provided with the probe. The purge pipe is a straight pipe, and the second quick shut-off valve is provided on the pipe body. The air inlet end of the purge pipe is connected to the air source, and the air outlet end thereof is bent toward the probe. The purge pipes on both sides of the second quick shut-off valve are provided with openings on the pipe body and are connected by a U-shaped tube. The first quick shut-off valve is provided on the pipe body of the U-shaped tube close to the air source, the third quick shut-off valve is provided on the pipe body of the U-shaped tube close to the probe, and the organic solvent tank is provided on the pipe body of the U-shaped tube between the first quick shut-off valve and the third quick shut-off valve.

[0006] Preferably, it also includes a system controller and an ultrasonic flowmeter host. The system controller includes a backflush controller, a signal holder, and a clock controller. The backflush controller is respectively connected to the first quick shut-off valve, the second quick shut-off valve, the third quick shut-off valve, and the clock controller with signal cables. The signal holder is respectively connected to the clock controller, the probe, and the ultrasonic flowmeter host with signal cables.

[0007] Preferably, the third quick shut-off valve is arranged directly below the organic solvent tank.

[0008] Preferably, it also includes an iron sheet door, and the air outlet at the end of the purge pipe is provided with the iron sheet door having the same diameter as the purge pipe, and the top of the iron sheet door is hingedly connected to the top of the air outlet at the end of the purge pipe.

[0009] Preferably, the gas source is nitrogen with a pressure of 0.8 MPa.

[0010] The beneficial effects of the utility model are as follows:

[0011] The utility model can realize automatic purging of the gas probe, completely eliminating the safety problems such as gas leakage caused by plugging and unplugging the original flow meter online probe. At the same time, during purging, the pre-purge signal is maintained as the flow value during the purging period, preventing abnormal fluctuations in the flow meter data during the purging period, which affects data statistics. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0013] Figure 2 This is a schematic diagram of the system controller structure of the utility model;

[0014] Figure 3 This is a flow chart of the control program of the utility model;

[0015] In the figure: 1. Gas source; 2. Purge pipe; 3. First quick shut-off valve; 4. U-shaped pipe; 5. Second quick shut-off valve; 6. Organic solvent tank; 7. Third quick shut-off valve; 8. Ultrasonic flowmeter sensor; 9. Iron sheet door; 10. Probe; 11. System controller; 111. Backflush controller; 112. Clock controller; 113. Signal holder; 12. Ultrasonic flowmeter host. DETAILED DESCRIPTION

[0016] The technical solution of the utility model is described in detail below with reference to the accompanying drawings and specific implementation methods.

[0017] The "first", "second" and "third" mentioned in the following embodiments do not represent specific quantities and orders, but are only used to distinguish names.

[0018] Example 1

[0019] An ultrasonic flow meter with self-purging and metering maintenance, such as Figure 1As shown, it includes an air source 1, a purge pipe 2, a first quick shut-off valve 3, a U-shaped tube 4, a second quick shut-off valve 5, an organic solvent tank 6, a third quick shut-off valve 7, an ultrasonic flowmeter sensor 8, and a probe 10. The ultrasonic flowmeter sensor 8 is provided with a probe 10. The purge pipe 2 is a straight pipe, and a second quick shut-off valve 5 is provided on the pipe body. The air inlet end of the purge pipe 2 is connected to the air source 1, and the air outlet end thereof is bent toward the probe 10. Openings are provided on the pipe body of the purge pipe 2 on both sides of the second quick shut-off valve 5, which are connected by a U-shaped tube 4. A first quick shut-off valve 3 is provided on the pipe body of the U-shaped tube 4 close to the air source 1, a third quick shut-off valve 7 is provided on the pipe body of the U-shaped tube 4 close to the probe 10, and an organic solvent tank 6 is provided on the pipe body of the U-shaped tube 4 between the first quick shut-off valve 3 and the third quick shut-off valve 7.

[0020] In a preferred solution, the diameter of the purge tube 2 is 6 mm.

[0021] In a preferred solution, the gas source 1 is a nitrogen source with a pressure of 0.8 MPa.

[0022] A preferred solution, such as Figure 1 As shown, it also includes a system controller 11 and an ultrasonic flow meter host 12. Figure 2 As shown, the system controller 11 includes a backflush controller 111, a clock controller 112, and a signal holder 113. The backflush controller 111 is respectively connected to the first quick shut-off valve 3, the second quick shut-off valve 5, the third quick shut-off valve 7, and the clock controller 112 with signal cables. The signal holder 113 is respectively connected to the clock controller 112, the probe 10, and the ultrasonic flowmeter host 12 with signal cables.

[0023] In a preferred solution, the third quick shut-off valve 7 is arranged directly below the organic solvent tank 6 .

[0024] A preferred solution, such as Figure 1 As shown, it also includes an iron sheet door 9. The air outlet end of the purge pipe 2 is provided with an iron sheet door 9 with the same diameter as the purge pipe 2. The top of the iron sheet door 9 is hingedly connected to the top of the air outlet at the end of the purge pipe 2 to ensure that the end of the purge pipe 2 can be closed by the weight of the iron sheet door 9 when the purge is completed.

[0025] like Figure 3As shown, when the utility model is running, the clock controller 112 automatically accumulates time. When the accumulated time reaches 8 hours, the accumulated time is cleared and the timing is reset. The purge start signal is sent to the signal holder 113 and the backflush controller 111 at the same time. The signal holder 113 works to achieve the current flow value unchanged. The backflush controller 111 receives the purge instruction and first opens the first quick cut-off valve 3 and the third quick cut-off valve 7 for 5 seconds. Nitrogen enters the organic solvent tank 6 and pressurizes the organic solvent to the purge pipe 2. The single consumption is 0.05L (the capacity of the organic solvent tank 6 is 5L, which can be used for one month after being filled once). The backflush controller 111 closes the first quick cut-off valve 3 and the third quick cut-off valve 7. The second quick cut-off valve 5 is opened, and the purge nitrogen merges the organic solvent entering the purge pipe 2 into a mist, which is sprayed onto the probe 10 through the iron door 9. After the dirty medium on the surface of the probe 10 contacts the mist organic solvent, it is decomposed and blown away, achieving the effect of cleaning the surface of the probe 10. The purge time is 180 seconds. After the purge is completed, the second quick shut-off valve 5 is closed, and the iron door 9 closes the purge pipe 2 by its own weight to prevent gas from entering the purge pipe 2. At the same time, the signal holder 113 cancels the flow holding function, and the flow meter enters the normal metering state.

[0026] The above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may be modified or some or all of the technical features thereof may be replaced with equivalents, and such modifications or replacements do not deviate from the essence of the corresponding technical solutions within the scope of the present invention.

Claims

1. An ultrasonic flow meter with self-purging and measurement retention, characterized in that: The invention comprises an air source, a purge pipe, a first quick shut-off valve, a U-shaped pipe, a second quick shut-off valve, an organic solvent tank, a third quick shut-off valve, an ultrasonic flow meter sensor, and a probe; the ultrasonic flow meter sensor is provided with the probe; the purge pipe is a straight pipe, and a second quick shut-off valve (5) is provided on the pipe body; the air inlet end of the purge pipe (2) is connected to the air source (1), and the air outlet end thereof is bent toward the probe (10); the pipe bodies of the purge pipes (2) located on both sides of the second quick shut-off valve (5) are provided with openings, which are connected through the U-shaped pipe (4); the first quick shut-off valve is provided on the pipe body of the U-shaped pipe close to the air source, the third quick shut-off valve is provided on the pipe body of the U-shaped pipe close to the probe, and the organic solvent tank is provided on the pipe body of the U-shaped pipe between the first quick shut-off valve and the third quick shut-off valve.

2. The ultrasonic flowmeter with self-purging and metering according to claim 1, characterized in that: It also includes a system controller and an ultrasonic flowmeter host. The system controller includes a backflush controller, a signal holder, and a clock controller. The backflush controller is respectively connected to the first quick shut-off valve, the second quick shut-off valve, the third quick shut-off valve, and the clock controller with signal cables. The signal holder is respectively connected to the clock controller, the probe, and the ultrasonic flowmeter host with signal cables.

3. The ultrasonic flowmeter with self-purging and metering according to claim 1, characterized in that: The third quick shut-off valve is arranged directly below the organic solvent tank.

4. The ultrasonic flowmeter with self-purging and metering according to claim 1, characterized in that: It also includes an iron sheet door. The air outlet at the end of the purge pipe is provided with the iron sheet door with the same diameter as the purge pipe. The top of the iron sheet door is hingedly connected to the top of the air outlet at the end of the purge pipe.

5. The ultrasonic flowmeter with self-purging and metering according to claim 1, characterized in that: The gas source is nitrogen, and the pressure is 0.8 MPa.

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