A non-disturbance back-purge device for wind speed sampling pipeline

Abstract

The invention discloses a non-disturbance back-purge device for a wind speed sampling pipeline, comprising an air duct (1), a back-up pipe (2), a dynamic pressure pressure-inducing pipeline (4) with a dynamic pressure pipe servo two-way ball valve (6), a static pressure pressure-inducing pipeline (3) with a static pressure pipe servo two-way ball valve (12), and a pressure transmitter (8). The dynamic pressure pressure-inducing pipeline (4) is connected to a purge air source distributor (22) through a back-purge dynamic pipe (37) with a dynamic pressure air source pulse generator (35) and a dynamic pressure first-level isolation electromagnetic valve (31), and the static pressure pressure-inducing pipeline (3) is connected to a purge air source distributor (22) through a back-purge static pipe (38) with a static pressure air source pulse generator (34) and a static pressure first-level isolation electromagnetic valve (32). The valves and the air source pulse generator are connected to a PLC control unit (25) through a line and are controlled by the PLC control unit (25). The invention can close and seal the sampling pipeline to prevent the back-purge airflow from interfering with the wind speed measuring device.

Description

Technical Field

[0001] The invention relates to the technical field of thermal power plants, garbage power plants and other technical fields requiring measurement of gas-solid two-phase flow, and in particular to a gas-solid two-phase wind speed sampling pipeline anti-blocking back-purge device, specifically a wind speed sampling pipeline non-disturbance back-purge device. Background Art

[0002] In actual applications, the primary wind speed measurement of the coal mill is inaccurate, and the sampling tube is often blocked, which brings great trouble to the operator in analyzing the combustion status of the boiler. After careful analysis of the sampling device that caused the failure, it was found that when the wind speed measurement device is working, due to the large amount of coal particles and various impurities in the conveying pipeline, after a period of measurement, these coal particles and various impurities will adhere to the sampling pipeline and sensor. After accumulating to a certain thickness, it will soon cause the sampling pipeline to be blocked, seriously affecting the measurement results. Summary of the invention

[0003] The purpose of the present invention is to provide a disturbance-free back-purge device for a wind speed sampling pipeline in view of the problems existing in the prior art, so as to completely solve the problem of failure of the wind speed measuring device caused by blockage of the sampling pipeline.

[0004] The purpose of the present invention is to be solved by the following technical solutions:

[0005] A non-disturbance back-purge device for a wind speed sampling pipeline comprises a back-up tube for sampling installed on an air duct, wherein the back-up tube is respectively connected to a dynamic pressure input side and a static pressure input side of a pressure transmitter through a dynamic pressure lead-in pipeline with a dynamic pressure tube servo two-way ball valve and a static pressure lead-in pipeline with a static pressure tube servo two-way ball valve, and is characterized in that: the dynamic pressure lead-in pipeline located in front of the dynamic pressure tube servo two-way ball valve is connected to a purge air source distributor through a back-purge dynamic pipe, and the static pressure lead-in pipeline located in front of the static pressure tube servo two-way ball valve is connected to a purge air source distributor through a back-purge dynamic pipe, and the static pressure lead-in pipeline located in front of the static pressure tube servo two-way ball valve is connected to a purge air source distributor through a back-purge dynamic pipe. The purge static pipe is connected to the purge air source distributor, the back-purge dynamic pipe is provided with a dynamic pressure air source pulse generator and a dynamic pressure first-level isolation solenoid valve, the back-purge static pipe is provided with a static pressure air source pulse generator and a static pressure first-level isolation solenoid valve, the dynamic pressure pipe servo two-way ball valve, the static pressure pipe servo two-way ball valve, the dynamic pressure first-level isolation solenoid valve, the static pressure first-level isolation solenoid valve, the static pressure air source pulse generator, and the dynamic pressure air source pulse generator are all connected to the PLC control unit through lines and are controlled by the PLC control unit.

[0006] The PLC control unit is connected to the touch screen and the switching power supply through a line, and the switching power supply is connected to the touch screen through a line, and the switching power supply can supply power to the PLC control unit and the touch screen.

[0007] The PLC control unit is connected to the backup battery power supply through a line.

[0008] The PLC control unit is connected to the power failure detection unit through a line, the power failure detection unit is connected to the V circuit and the power failure detection unit is respectively connected to the switch power supply and the backup battery pack power supply through lines.

[0009] The back-purge dynamic pipe is provided with a dynamic pressure manual purge valve, a dynamic pressure tube flowmeter, a dynamic pressure secondary isolation solenoid valve, a dynamic pressure primary isolation solenoid valve and a dynamic pressure air source pulse generator in sequence. The dynamic pressure manual purge valve is arranged adjacent to the purge air source distributor and the dynamic pressure air source pulse generator is arranged adjacent to the dynamic pressure pressure-leading pipeline. The dynamic pressure tube flowmeter, the dynamic pressure secondary isolation solenoid valve, the dynamic pressure primary isolation solenoid valve and the dynamic pressure air source pulse generator are all connected to the PLC control unit through lines.

[0010] The back-purge static pipe is provided with a static pressure manual purge valve, a static pressure tube flow meter, a static pressure secondary isolation solenoid valve, a static pressure primary isolation solenoid valve and a static pressure air source pulse generator in sequence. The static pressure manual purge valve is arranged adjacent to the purge air source distributor and the static pressure air source pulse generator is arranged adjacent to the static pressure lead pipeline. The static pressure tube flow meter, the static pressure secondary isolation solenoid valve, the static pressure primary isolation solenoid valve and the static pressure air source pulse generator are all connected to the PLC control unit through lines.

[0011] An air source pressure regulating valve, an air source impurity filter and an air intake main valve are sequentially arranged on the air intake side of the purge air source distributor, and the air source pressure regulating valve is arranged adjacent to the purge air source distributor.

[0012] The output end of the pressure transmitter is connected to the signal acquisition isolator.

[0013] A dynamic pressure sensor is provided on the dynamic pressure supply pipeline between the dynamic pressure pipe servo two-way ball valve and the pressure transmitter, and a static pressure sensor is provided on the static pressure supply pipeline between the static pressure pipe servo two-way ball valve and the pressure transmitter. Both the static pressure sensor and the dynamic pressure sensor are connected to the PLC control unit through lines to transmit pressure data.

[0014] The dynamic pressure pressure-guiding pipelines on both sides of the dynamic pressure pipe servo two-way ball valve are respectively provided with a first dynamic pressure manual three-way valve and a second dynamic pressure manual three-way valve, and the third interface of the first dynamic pressure manual three-way valve and the third interface of the second dynamic pressure manual three-way valve are connected through a dynamic pressure branch pipeline with a dynamic pressure manual two-way valve; the static pressure pressure-guiding pipelines on both sides of the static pressure pipe servo two-way ball valve are respectively provided with a first static pressure manual three-way valve and a second static pressure manual three-way valve, and the third interface of the first static pressure manual three-way valve and the third interface of the second static pressure manual three-way valve are connected through a static pressure branch pipeline with a static pressure manual two-way valve.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] The disturbance-free back-purge device of the present invention completely solves the problem of malfunction of the wind speed measuring device due to blockage of the sampling pipeline. During the purge period, the disturbance-free back-purge device can completely close and seal the sampling pipeline, maintain the pressure state before sampling, and protect the wind speed measuring device from interference from the back-blowing airflow disturbance signal. The signal will remain stable and unchanged without affecting the operation of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attached Figure 1 It is a schematic diagram of the control principle of the non-disturbance back-purge device for the wind speed sampling pipeline of the present invention;

[0018] Attached Figure 2 It is a schematic diagram of single air duct back-flushing of the non-disturbance back-flushing device for the wind speed sampling pipeline of the present invention;

[0019] Attached Figure 3 It is a schematic diagram of multi-duct back-flushing of the disturbance-free back-flushing device for the wind speed sampling pipeline of the present invention.

[0020] Among them: 1-air duct; 2-backrest pipe; 3-static pressure supply pipeline; 4-dynamic pressure supply pipeline; 5-first dynamic pressure manual three-way valve; 6-dynamic pressure pipe servo two-way ball valve; 7-second dynamic pressure manual three-way valve; 8-pressure transmitter; 9-signal acquisition isolator; 10-dynamic pressure manual two-way valve; 11-first static pressure manual three-way valve; 12-static pressure pipe servo two-way ball valve; 13-second static pressure manual three-way valve; 14-static pressure sensor; 15-dynamic pressure sensor; 16-dynamic pressure secondary isolation solenoid valve; 17-static pressure secondary isolation solenoid valve; 18-dynamic pressure pipe flowmeter; 19-static pressure pipe flowmeter ; 20—static pressure manual purge valve; 21—dynamic pressure manual purge valve; 22—purge gas source distributor; 23—touch screen; 24—switch power supply; 25—PLC control unit; 26—backup battery pack power supply; 27—gas source pressure regulating valve; 28—gas source impurity filter; 29—air intake main line; 30—air intake main valve; 31—dynamic pressure first-level isolation solenoid valve; 32—static pressure first-level isolation solenoid valve; 33—power failure detection unit; 34—static pressure gas source pulse generator; 35—dynamic pressure gas source pulse generator; 36—static pressure manual two-way valve; 37—back-purge dynamic pipe; 38—back-purge static pipe. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] like Figure 1-2As shown: a disturbance-free back-purge device for a wind speed sampling pipeline, comprising a back-up tube 2 for sampling installed on an air duct 1, the back-up tube 2 is respectively connected to the dynamic pressure input side and the static pressure input side of a pressure transmitter 8 through a dynamic pressure guiding pipeline 4 with a dynamic pressure tube servo two-way ball valve 6 and a static pressure guiding pipeline 3 with a static pressure tube servo two-way ball valve 12, and the output end of the pressure transmitter 8 is connected to a signal acquisition isolator 9; a dynamic pressure sensor 15 is provided on the dynamic pressure guiding pipeline 4 between the dynamic pressure tube servo two-way ball valve 6 and the pressure transmitter 8, and a static pressure sensor 14 is provided on the static pressure guiding pipeline 3 between the static pressure tube servo two-way ball valve 12 and the pressure transmitter 8, and both the static pressure sensor 14 and the dynamic pressure sensor 15 are connected to a PLC control unit 25 through lines to transmit pressure data. In order to prevent the dynamic pressure pipe servo two-way ball valve 6 and / or the static pressure pipe servo two-way ball valve 12 from failing to work, a first dynamic pressure manual three-way valve 5 and a second dynamic pressure manual three-way valve 7 are respectively provided on the dynamic pressure pressure supply pipeline 4 on both sides of the dynamic pressure pipe servo two-way ball valve 6, and the third interface of the first dynamic pressure manual three-way valve 5 and the third interface of the second dynamic pressure manual three-way valve 7 are connected via a dynamic pressure branch pipeline with a dynamic pressure manual two-way valve 10; a first static pressure manual three-way valve 11 and a second static pressure manual three-way valve 13 are respectively provided on the static pressure supply pipeline 3 on both sides of the static pressure pipe servo two-way ball valve 12, and the third interface of the first static pressure manual three-way valve 11 and the third interface of the second static pressure manual three-way valve 13 are connected via a static pressure branch pipeline with a static pressure manual two-way valve 36.

[0023] In order to perform non-disturbance back-purge operation, in the non-disturbance back-purge device for the wind speed sampling pipeline, the dynamic pressure lead pipeline 4 located in front of the dynamic pressure pipe servo two-way ball valve 6 is connected to the purge gas source distributor 22 through a back-purge dynamic pipe 37, and the static pressure lead pipeline 3 located in front of the static pressure pipe servo two-way ball valve 12 is connected to the purge gas source distributor 22 through a back-purge static pipe 38; the dynamic pressure manual purge valve 21, the dynamic pressure pipe flowmeter 18, the dynamic pressure secondary purge valve 21, the dynamic pressure pipe flowmeter 18, the dynamic pressure secondary purge valve 22, the dynamic pressure pipe flowmeter 19, the dynamic pressure secondary purge valve 21, the dynamic pressure pipe flowmeter 19, the dynamic pressure secondary purge valve 22, the dynamic pressure pipe flowmeter 19, the dynamic pressure secondary purge valve 22, the dynamic pressure pipe flowmeter 19, the dynamic pressure pipe flowmeter 20, the dynamic pressure pipe flowmeter 21, the dynamic pressure pipe flowmeter 20, the dynamic pressure secondary purge valve 21, the dynamic pressure pipe flowmeter 19, the dynamic pressure secondary purge valve 22, the dynamic pressure pipe flowmeter 19, the dynamic pressure pipe flowmeter 20 ... The isolation solenoid valve 16, the dynamic pressure first-level isolation solenoid valve 31 and the dynamic pressure gas source pulse generator 35, the dynamic pressure manual purge valve 21 is arranged adjacent to the purge gas source distributor 22 and the dynamic pressure gas source pulse generator 35 is arranged adjacent to the dynamic pressure lead pipe 4, and the static pressure manual purge valve 20, the static pressure pipe flowmeter 19, the static pressure second-level isolation solenoid valve 17, the static pressure first-level isolation solenoid valve 32 and the static pressure gas source pulse generator 34 are arranged in sequence on the back-purge static pipe 38, and the static pressure manual purge valve 20 is arranged adjacent to the purge gas source distributor 22 and the dynamic pressure gas source pulse generator 35 is arranged adjacent to the dynamic pressure lead pipe 4. The gas source distributor 22 is set and the static pressure gas source pulse generator 34 is set adjacent to the static pressure lead pipe 3. The above-mentioned dynamic pressure pipe servo two-way ball valve 6, static pressure pipe servo two-way ball valve 12, dynamic pressure pipe flow meter 18, dynamic pressure secondary isolation solenoid valve 16, dynamic pressure primary isolation solenoid valve 31, dynamic pressure gas source pulse generator 35, static pressure pipe flow meter 19, static pressure secondary isolation solenoid valve 17, static pressure primary isolation solenoid valve 32 and static pressure gas source pulse generator 34 are all connected to the PLC control through the line. The PLC control unit 25 is connected to the purge gas source distributor 22, wherein the dynamic pressure tube flow meter 18 and the static pressure tube flow meter 19 transmit the reverse purge gas flow signal to the PLC control unit 25, and the dynamic pressure tube servo two-way ball valve 6, the static pressure tube servo two-way ball valve 12, the dynamic pressure secondary isolation solenoid valve 16, the dynamic pressure primary isolation solenoid valve 31, the dynamic pressure gas source pulse generator 35, the static pressure secondary isolation solenoid valve 17, the static pressure primary isolation solenoid valve 32 and the static pressure gas source pulse generator 34 are controlled by the PLC control unit 25. In addition, in order to provide clean gas, an air source pressure regulating valve 27, an air source impurity filter 28 and an air intake main valve 30 are sequentially arranged on the air intake main line 29 on the air intake side of the purge gas source distributor 22, and the air source pressure regulating valve 27 is arranged adjacent to the purge gas source distributor 22. In addition, the air source pressure regulating valve 27 and the air intake main valve 30 are selected to be controlled manually or by the PLC control unit 25 according to the needs.

[0024] On the basis of the above technical solution, the above PLC control unit 25 is connected to the touch screen 23 and the switch power supply 24 through a line, and the switch power supply 24 is connected to the touch screen 23 through a line. The switch power supply 24 can supply power to the PLC control unit 25 and the touch screen 23. The touch screen 23 is used to set parameters such as the back-purge frequency and view the signals transmitted to the PLC control unit 25 by the flow meter, pressure sensor, etc. In order to prevent the back-purge operation from being performed during a power outage, the PLC control unit 25 is connected to the backup battery pack power supply 26 through a line; in order to obtain power outage information in a timely manner, the PLC control unit 25 is connected to the power outage detection unit 33 through a line, the power outage detection unit 33 is connected to the 220V circuit, and the power outage detection unit 33 is respectively connected to the switch power supply 24 and the backup battery pack power supply 26 through lines.

[0025] The above-mentioned disturbance-free back-purge device for the wind speed sampling pipeline has multiple functions such as automatic back-purge, manual back-purge, automatic back-purge during power failure, and manual back-purge during power failure.

[0026] The automatic back-purge function of the disturbance-free back-purge device for the wind speed sampling pipeline of the present invention is described below by means of specific examples.

[0027] The automatic back-flushing process of the disturbance-free back-flushing device for the wind speed sampling pipeline of the present invention is as follows.

[0028] 1. Turn on the power, all electric control valves are in the closed state, open the main air intake valve 30, dynamic pressure manual purge valve 20, and static pressure manual purge valve 21, and the factory air source flows into the air source impurity filter 28 through the air intake main line 29. The filtered air source enters the air source pressure regulating valve 27, and after adjustment, it can output 0.1-0.8Mpa compressed air to supply the purge air source distributor 22.

[0029] 2. The purge gas source distributor 22 distributes the purge gas source to the back-purge static pipe 38 and the back-purge dynamic pipe 37, and the purge gas source enters the static pressure pipe flow meter 19 and the dynamic pressure pipe flow meter 18 through the static pressure manual purge valve 20 and the dynamic pressure manual purge valve 21, respectively.

[0030] 3. When back-purge is not performed, the backrest pipe 2 measures the differential pressure signal in the air duct 1: the dynamic pressure passes through the first dynamic pressure manual three-way valve 5, the dynamic pressure pipe servo two-way ball valve 6, the second dynamic pressure manual three-way valve 7, and the dynamic pressure sensor 15 in the dynamic pressure lead pipe 4 to reach the dynamic pressure input side of the pressure transmitter 8; the static pressure passes through the first static pressure manual three-way valve 11, the static pressure pipe servo two-way ball valve 12, the second static pressure manual three-way valve 13, and the static pressure sensor 14 in the static pressure lead pipe 3 to reach the static pressure input side of the pressure transmitter 8; the pressure transmitter 8 converts the differential pressure signal of the two into a 4-20MA signal and sends it to the signal acquisition isolator 9, which analyzes and stores the signal and sends it to the plant centralized control room DCS at the same time.

[0031] 4. During back-purging, after the purging time set in the touch screen 23 is reached, back-purging is started: first, the PLC control unit 25 closes the dynamic pressure tube servo two-way ball valve 6 and the static pressure tube servo two-way ball valve 12, opens the dynamic pressure first-level isolation solenoid valve 31, opens the static pressure first-level isolation solenoid valve 32, and at the same time feeds back the signal of being able to enter the working state to the PLC control unit 25. After receiving the signal, the PLC control unit 25 opens the dynamic pressure second-level isolation solenoid valve 16 and the static pressure second-level isolation solenoid valve 17, so that the purging gas source enters the dynamic pressure gas source pulse generator 35 and the static pressure gas source pulse generator 34 to back-purge the sampling pipeline. The purging time is adjustable.

[0032] 5. After the purging is completed, the PLC control unit 25 first closes the dynamic pressure secondary isolation solenoid valve 16 and the static pressure secondary isolation solenoid valve 17 to prevent the gas source from entering the sampling pipeline; secondly, it closes the dynamic pressure primary isolation solenoid valve 31 and the static pressure primary isolation solenoid valve 32, and finally opens the dynamic pressure pipe servo two-way ball valve 6 and the static pressure pipe servo two-way ball valve 12 to complete the purging.

[0033] When the dynamic pressure pipe servo two-way ball valve 6 and / or the static pressure pipe servo two-way ball valve 12 fails and cannot work, the valves of the first dynamic pressure manual three-way valve 5, the second dynamic pressure manual three-way valve 7, the first static pressure manual three-way valve 11, and the second static pressure manual three-way valve 13 are switched and the dynamic pressure manual two-way valve 10 and the static pressure manual two-way valve 36 are opened, so that the dynamic pressure passes through the first dynamic pressure manual three-way valve 5 on the dynamic pressure guide line 4, enters the dynamic pressure manual two-way valve 10 on the dynamic pressure branch line, and then returns to the second dynamic pressure manual three-way valve 7 on the dynamic pressure guide line 4, and passes through the dynamic pressure transmitter on the dynamic pressure guide line 4. The sensor 15 reaches the dynamic pressure input side of the pressure transmitter 8; the static pressure passes through the first static pressure manual three-way valve 11 on the static pressure lead line 3, enters the static pressure manual two-way valve 36 on the static pressure branch line, and then returns to the second static pressure manual three-way valve 13 on the static pressure lead line 3, and passes through the static pressure sensor 14 on the static pressure lead line 3 to reach the static pressure input side of the pressure transmitter 8; the pressure transmitter 8 converts the differential pressure signal of the two into a 4-20MA signal and sends it to the signal acquisition isolator 9, which analyzes and stores the signal and sends it to the factory centralized control room DCS at the same time. The above process is the difference between the manual back-purge workflow and the automatic back-purge workflow of the wind speed sampling pipeline disturbance-free back-purge device of the present invention. In this process, the dynamic pressure pipe servo two-way ball valve 6 and / or the static pressure pipe servo two-way ball valve 12 can also be replaced as needed.

[0034] The non-disturbance back-purge device for the wind speed sampling pipeline of the present invention can not only perform back-purge operation, but also perform fault diagnosis:

[0035] Intelligent fault diagnosis 1. During the operation of the non-disturbance back-purge device for the wind speed sampling pipeline of the present invention, when the PLC control unit 25 detects that the pressure value of the static pressure sensor 14 and / or the dynamic pressure sensor 15 is lower than the set value, the PLC control unit 25 will automatically start the back-purge; after the back-purge is completed, if the pressure value of the static pressure sensor 14 and / or the dynamic pressure sensor 15 is still lower than the set value, the PLC control unit 25 will intelligently send an alarm signal to the control room;

[0036] Intelligent fault diagnosis II. During the operation of the non-disturbance back-purge device for the wind speed sampling pipeline of the present invention, when the PLC control unit 25 detects that the signal data of the pressure transmitter 8 is abnormal, the PLC control unit 25 will start the back-purge; after the back-purge is completed, if the signal data of the pressure transmitter 8 is still abnormal, the PLC control unit 25 will intelligently send an alarm signal to the control room;

[0037] Intelligent fault diagnosis 3. When the power failure detection unit 33 detects a power failure in the external power supply of the device, it will actively disconnect the external power supply and start the "backup battery pack power supply 26"; the wind speed sampling pipeline disturbance-free back-purge device of the present invention enters the backup power supply working state, and the system will intelligently send an alarm signal to the control room.

[0038] The non-disturbance back-purge device for the wind speed sampling pipeline of the present invention is not limited to back-purge operation on one air duct, but can also back-purge multiple air ducts at the same time (see the drawing for details). Figure 3 as shown).

[0039] The disturbance-free back-purge device of the present invention completely solves the problem of malfunction of the wind speed measuring device due to blockage of the sampling pipeline. During the purge period, the disturbance-free back-purge device can completely close and seal the sampling pipeline, maintain the pressure state before sampling, and protect the wind speed measuring device from interference from the back-blowing airflow disturbance signal. The signal will remain stable and unchanged without affecting the operation of the unit.

[0040] The above embodiments are only for illustrating the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the present invention; any technology not involved in the present invention can be realized by existing technologies.

Claims

1. A disturbance-free back-purge device for a wind speed sampling pipeline, comprising a back-up tube (2) for sampling installed on an air duct (1), the back-up tube (2) being connected to a dynamic pressure input side and a static pressure input side of a pressure transmitter (8) through a dynamic pressure pipe servo two-way ball valve (6) and a static pressure pipe servo two-way ball valve (12), respectively, and characterized in that: The dynamic pressure guide pipe (4) located in front of the dynamic pressure pipe servo two-way ball valve (6) is connected to the purge gas source distributor (22) through a back-purge dynamic pipe (37), and the static pressure guide pipe (3) located in front of the static pressure pipe servo two-way ball valve (12) is connected to the purge gas source distributor (22) through a back-purge static pipe (38). The dynamic pressure pipe servo two-way ball valve (6) and the static pressure pipe servo two-way ball valve (12) are both connected to the PLC control unit (25) through a line and are controlled by the PLC control unit (25). The back-purge dynamic pipe (37) is provided with a dynamic pressure manual purge valve (21), a dynamic pressure pipe flow meter (18), a dynamic pressure secondary isolation solenoid valve (16), a dynamic pressure primary isolation solenoid valve (31) and a dynamic pressure gas source pulse generator (35) in sequence. The dynamic pressure manual purge valve (21) is arranged adjacent to the purge gas source distributor (22) and the dynamic pressure gas source pulse generator (35) is arranged adjacent to the purge gas source distributor (22). The static pressure pipe (38) is provided adjacent to the dynamic pressure supply line (4); the dynamic pressure pipe flow meter (18), the dynamic pressure secondary isolation solenoid valve (16), the dynamic pressure primary isolation solenoid valve (31) and the dynamic pressure air source pulse generator (35) are all connected to the PLC control unit (25) through lines; the static pressure manual purge valve (20), the static pressure pipe flow meter (19), the static pressure secondary isolation solenoid valve (17), the static pressure primary isolation solenoid valve (32) and the static pressure air source pulse generator (34) are provided on the back-purge static pipe (38) in sequence; the static pressure manual purge valve (20) is provided adjacent to the purge air source distributor (22) and the static pressure air source pulse generator (34) is provided adjacent to the static pressure supply line (3); the static pressure pipe flow meter (19), the static pressure secondary isolation solenoid valve (17), the static pressure primary isolation solenoid valve (32) and the static pressure air source pulse generator (34) are all connected to the PLC control unit (25) through lines.

2. The disturbance-free back-purge device for wind speed sampling pipeline according to claim 1 is characterized in that: The PLC control unit (25) is connected to the touch screen (23) and the switching power supply (24) via a line, and the switching power supply (24) is connected to the touch screen (23) via a line, and the switching power supply (24) can supply power to the PLC control unit (25) and the touch screen (23).

3. The disturbance-free back-purge device for wind speed sampling pipeline according to claim 2 is characterized in that: The PLC control unit (25) is connected to the backup battery power supply (26) via a line.

4. The disturbance-free back-purge device for wind speed sampling pipeline according to claim 3 is characterized in that: The PLC control unit (25) is connected to the power failure detection unit (33) via a line, the power failure detection unit (33) is connected to a 220V circuit and the power failure detection unit (33) is connected to a switch power supply (24) and a backup battery pack power supply (26) via lines respectively.

5. The non-disturbance back-purge device for wind speed sampling pipeline according to any one of claims 1 to 4, characterized in that: An air source pressure regulating valve (27), an air source impurity filter (28) and an air intake main valve (30) are sequentially arranged on the air intake main line (29) on the air intake side of the purge air source distributor (22), and the air source pressure regulating valve (27) is arranged adjacent to the purge air source distributor (22).

6. The disturbance-free back-purge device for wind speed sampling pipeline according to any one of claims 1 to 4, characterized in that: The output end of the pressure transmitter (8) is connected to the signal acquisition isolator (9).

7. The disturbance-free back-purge device for wind speed sampling pipeline according to any one of claims 1 to 4, characterized in that: A dynamic pressure sensor (15) is provided on the dynamic pressure guide line (4) between the dynamic pressure pipe servo two-way ball valve (6) and the pressure transmitter (8), and a static pressure sensor (14) is provided on the static pressure guide line (3) between the static pressure pipe servo two-way ball valve (12) and the pressure transmitter (8), and both the static pressure sensor (14) and the dynamic pressure sensor (15) are connected to a PLC control unit (25) via a line to transmit pressure data.

8. The disturbance-free back-purge device for wind speed sampling pipeline according to any one of claims 1 to 4, characterized in that: The dynamic pressure pressure-inducing pipelines (4) on both sides of the dynamic pressure pipe servo two-way ball valve (6) are respectively provided with a first dynamic pressure manual three-way valve (5) and a second dynamic pressure manual three-way valve (7); the third interface of the first dynamic pressure manual three-way valve (5) and the third interface of the second dynamic pressure manual three-way valve (7) are connected via a dynamic pressure branch pipeline with a dynamic pressure manual two-way valve (10); the static pressure pressure-inducing pipelines (3) on both sides of the static pressure pipe servo two-way ball valve (12) are respectively provided with a first static pressure manual three-way valve (11) and a second static pressure manual three-way valve (13); the third interface of the first static pressure manual three-way valve (11) and the third interface of the second static pressure manual three-way valve (13) are connected via a static pressure branch pipeline with a static pressure manual two-way valve (36).

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