Online automatic sampling and automatic cleaning system

Abstract

The utility model discloses an on-line automatic sampling and cleaning system, which comprises a cleaning pipeline and a sampling pipeline, the cleaning pipeline sequentially comprises an NO3 interface communicated with deionized water for cleaning, a cut-off ball valve I and a pneumatic valve; the sampling pipeline sequentially comprises a filter, a one-way valve, a cut-off ball valve II, a pneumatic pump, a damper and a flow meter which are arranged in the sample pool, and the flow meter is connected with an analyzer through an N02 interface; the sample pool is provided with a liquid level transmitter used for monitoring the liquid level, a sample is communicated with the filter through an N01 connector, and an outlet of the pneumatic valve is also communicated with an inlet of the one-way valve. The utility model provides the online automatic sampling and cleaning device which is stable and reliable in effect and realizes online automatic sampling and cleaning.

Description

Technical Field

[0001] The utility model relates to a system for online automatic sampling and automatic cleaning, belonging to the technical field of wastewater treatment. Background Art

[0002] In the online water quality analysis system, the samples usually taken are wastewater, sewage or rainwater, and most of the samples come from rainwater wells and wastewater pits. The samples contain a large amount of particulate impurities and have a certain depth, so they need to be pumped. The general small-flow pneumatic pump has limited suction capacity and is easily blocked by particulate impurities at the bottom of the sample. The use of high-performance pumps is costly and greatly increases the consumption of electricity and gas, causing unnecessary waste. In addition, when the back-end sample pipeline is blocked, the analyzer needs to be stopped, and the blocked filters and pipelines need to be removed and cleaned before installation and leakage testing, which greatly prolongs the downtime of the instrument, reduces the normal operation efficiency of the entire system, and greatly increases the maintenance cost.

[0003] Therefore, it is particularly important to design an online automatic sampling and cleaning system to achieve efficient sampling and online automatic cleaning of pipelines, reduce material costs, operating costs and labor maintenance costs, and improve the operating efficiency of the entire analyzer system. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide an online automatic sampling and automatic cleaning system for efficient sampling in deep water and automatic cleaning of dirty sample pipelines.

[0005] In order to solve the above problems, the technical solution of the utility model is to provide an online automatic sampling and automatic cleaning system, which includes a cleaning pipeline and a sampling pipeline. The cleaning pipeline includes a NO3 interface connected to deionized water for cleaning, a cut-off ball valve 1, and a pneumatic valve in sequence; the sampling pipeline includes a filter, a one-way valve, a cut-off ball valve 2, a pneumatic pump, a damper, and a flow meter arranged in a sample pool, and the flow meter is connected to an analyzer through a N02 interface; the sample pool is provided with a level transmitter for monitoring the liquid level, the sample is connected to the filter through the N01 interface, and the outlet of the pneumatic valve is also connected to the inlet of the one-way valve.

[0006] Preferably, the pneumatic valve is in a normally closed state.

[0007] Preferably, the liquid level transmitter and flow meter are both controlled by a controller.

[0008] More preferably, it also includes a solenoid valve air source pipeline, which includes a N04 interface connected to the air source, and the outlet of the N04 interface after being connected to the cut-off ball valve three is divided into two paths, one path is respectively connected to the solenoid valve one and the three-way ball valve one, and the other path is respectively connected to the solenoid valve two and the three-way ball valve two, the outlet of the solenoid valve one is connected to the other inlet of the three-way ball valve one, and the outlet of the solenoid valve two is connected to the other inlet of the three-way ball valve two; the outlet of the three-way ball valve one is connected to the pneumatic pump, and the outlet of the three-way ball valve two is connected to the pneumatic valve.

[0009] Furthermore, the solenoid valve 1 and the solenoid valve 2 are both controlled by a controller.

[0010] Furthermore, the solenoid valve 1 is provided with a first drain port; and the solenoid valve 2 is provided with a second drain port.

[0011] The technical solution of the utility model provides a stable and reliable effect, realizing online automatic sampling and cleaning. Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. A filter is set at the sampling inlet to provide clean samples to downstream equipment to protect downstream equipment.

[0013] 2. A one-way valve is added to the front end of the pneumatic pump inlet. The principle of the one-way valve is adopted to retain the sample at the front end of the pump, realize the wet suction condition of the pneumatic pump, enhance the suction capacity of the pump and increase the operation cycle of the pump.

[0014] 3. Use factory deionized water to clean the pipes, which is convenient and low-cost, ensuring the representativeness of the samples and the accuracy of the analyzer's measurement results.

[0015] 4. The flow meter is equipped with needle valve adjustment and low flow alarm output, which can not only adjust the flow and observe the flow, but also output the alarm signal and interlock with PLC to realize automatic cleaning of the system;

[0016] 5. The solenoid valve of the control circuit is connected in parallel with a manual three-way ball valve, so that the system also has the function of manual pipeline cleaning;

[0017] 6. The solenoid valve is used to drive the pneumatic valve through the air source. The circuit of the control loop and the water circuit of the sample loop are separated to ensure the safe and stable operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the online sampling and automatic cleaning system provided by the utility model. DETAILED DESCRIPTION

[0019] In order to make the present invention more obvious and easy to understand, preferred embodiments are described in detail as follows in conjunction with the accompanying drawings.

[0020] Example

[0021] like Figure 1 As shown, an online sampling and automatic cleaning system provided by the utility model includes a cleaning pipeline, a sampling pipeline, and an electromagnetic valve air source pipeline. The cleaning pipeline includes a NO3 interface connected to deionized water for cleaning, a cut-off ball valve D-1, and a pneumatic valve C in sequence; the sampling pipeline includes a filter A, a one-way valve B, a cut-off ball valve D-2, a pneumatic pump E, a damper F, and a flowmeter G arranged in the sample pool, and the flowmeter G is connected to the analyzer through the NO2 interface; the sample pool is provided with a level transmitter I for monitoring the liquid level, and the sample is connected to the filter A through the NO1 interface, and the outlet of the pneumatic valve C is also connected to the single The solenoid valve gas source pipeline includes a N04 interface connected to the gas source. The outlet of the N04 interface after connecting to the cut-off ball valve D-3 is divided into two paths. One path is respectively connected to the solenoid valve S-1 and the three-way ball valve H-1, and the other path is respectively connected to the solenoid valve S-2 and the three-way ball valve H-2. The outlet of the solenoid valve S-1 is connected to the other inlet of the three-way ball valve H-1, and the outlet of the solenoid valve S-2 is connected to the other inlet of the three-way ball valve H-2; the outlet of the three-way ball valve H-1 is connected to the pneumatic pump E, and the outlet of the three-way ball valve H-2 is connected to the pneumatic actuator of the pneumatic valve C. The outlet of the three-way ball valve H-1 is the gas source a, and the outlet of the three-way ball valve H-2 is the gas source b.

[0022] The pneumatic valve C is in a normally closed state. The solenoid valve S-1 is provided with an exhaust port V01; the solenoid valve S-2 is provided with an exhaust port V02.

[0023] The liquid level transmitter I, flow meter G, solenoid valve 1 S-1, and solenoid valve 2 S-2 are all controlled by the controller PLC.

[0024] The implementation method of the automatic sampling and cleaning system is as follows:

[0025] Interlocking between liquid level transmitter I and pneumatic pump E:

[0026] The liquid level signal detected by the liquid level transmitter I is given to the PLC, which controls the solenoid valve through the PLC interlock to control the start and stop of the pneumatic pump; when the liquid level is high, the pump is started, and when the liquid level is low, the pump is stopped.

[0027] The liquid level is high or low, and the pneumatic pump E does not run all the time. When starting the pneumatic pump E for the first time, manually inject water in front of the pneumatic pump E pipeline. Under the action of the one-way valve B, the water always remains in the pipeline in front of the pneumatic pump E, providing wet cleaning conditions for each start of the pneumatic pump E, greatly enhancing the suction height of the pneumatic pump E; then the sample is allowed to flow smoothly to the rear end through the damper F; when the flow meter G low flow alarm indicates that the filter and pipeline are blocked, the flow meter G alarm signal is given to the controller PLC, and the controller PLC triggers the signal to control the solenoid valve 1 S-1 and the solenoid valve 2 S-2 to act, and respectively close the air source a to close the pneumatic pump E (the residual air in the air source pipeline is emptied from the exhaust port 2 V01); send out the air source b, open the pneumatic valve C; then the deionized water for cleaning the pipeline passes through the cut-off ball valve D-1 and the pneumatic valve C, and flows through the filter A to start cleaning the filter;

[0028] When the alarm of flow meter G is eliminated, the controller PLC controls the solenoid valve S-1 and the solenoid valve S-2 to respectively send out gas source a to start the pneumatic pump E; closes the gas source b to close the pneumatic valve C (the residual air in the gas source pipeline is exhausted from the exhaust port V02); the sample pipeline enters the normal sample transportation state, and the analyzer enters the normal analysis state.

Claims

1. An online automatic sampling and automatic cleaning system, characterized in that: It comprises a cleaning pipeline and a sampling pipeline, wherein the cleaning pipeline comprises a NO3 interface connected to deionized water for cleaning, a cut-off ball valve (D-1), and a pneumatic valve (C) in sequence; the sampling pipeline comprises a filter (A) arranged in a sample pool, a one-way valve (B), a cut-off ball valve (D-2), a pneumatic pump (E), a damper (F), and a flow meter (G), wherein the flow meter (G) is connected to an analyzer via a NO2 interface; the sample pool is provided with a level transmitter (I) for monitoring the liquid level, the sample is connected to the filter (A) via a NO1 interface, and the outlet of the pneumatic valve (C) is also connected to the inlet of the one-way valve (B).

2. The online automatic sampling and automatic cleaning system according to claim 1, characterized in that: The pneumatic valve (C) is in a normally closed state.

3. The online automatic sampling and automatic cleaning system according to claim 1 or 2, characterized in that: The liquid level transmitter (I) and flow meter (G) are both controlled by a controller PLC.

4. The online automatic sampling and automatic cleaning system according to claim 3, characterized in that: It also includes an electromagnetic valve air source pipeline, which includes an N04 interface connected to the air source. The outlet of the N04 interface after connecting to the cut-off ball valve three (D-3) is divided into two paths, one path is respectively connected to the electromagnetic valve one (S-1) and the three-way ball valve one (H-1), and the other path is respectively connected to the electromagnetic valve two (S-2) and the three-way ball valve two (H-2). The outlet of the electromagnetic valve one (S-1) is connected to the other inlet of the three-way ball valve one (H-1), and the outlet of the electromagnetic valve two (S-2) is connected to the other inlet of the three-way ball valve two (H-2); the outlet of the three-way ball valve one (H-1) is connected to the pneumatic pump (E), and the outlet of the three-way ball valve two (H-2) is connected to the pneumatic valve (C).

5. The online automatic sampling and automatic cleaning system according to claim 4, characterized in that: The solenoid valve 1 (S-1) and the solenoid valve 2 (S-2) are both controlled by a controller PLC.

6. The online automatic sampling and automatic cleaning system according to claim 4, characterized in that: The solenoid valve 1 (S-1) is provided with an exhaust port 1 (V01); the solenoid valve 2 (S-2) is provided with an exhaust port 2 (V02).

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