CN211786728U - Online measurement and control device for sodium hypochlorite disinfectant - Google Patents

Abstract

An on-line measurement and control device for sodium hypochlorite disinfectant, comprising: a liquid addition mechanism, including a liquid medicine bucket, the liquid medicine tank is connected to a cleaning machine through a liquid addition pipeline, and a metering pump is arranged on the liquid addition pipeline; a detection mechanism, Including an on-line sampler, the on-line sampler is provided with a temperature sensor, a residual chlorine sensor and a PH sensor, the inlet and the outlet of the on-line sampler are respectively communicated with the cleaning tank of the cleaning machine through a sampling pipeline; and a control mechanism, respectively It is connected with the dosing mechanism and the detection mechanism. The utility model can be used in conjunction with a cleaning machine to automatically add hypochlorous acid cleaning and disinfecting liquid and control its pH value and residual chlorine concentration on-line. It is used for the cleaning and disinfection of aquatic products, vegetables, fruits and other agricultural raw materials in the cleaning machine, which can meet the needs of different cleaning and disinfection processes, and has high control stability and strong anti-interference ability.

Description

A kind of online measurement and control device of sodium hypochlorite disinfectant

technical field

The utility model relates to an on-line control device for hypochlorous acid disinfectant, in particular to an on-line monitoring and control device for sodium hypochlorite disinfectant used for the cleaning and disinfection of aquatic products, vegetables, fruits and other agricultural raw materials in a washing machine.

Background technique

Disinfection is an important link in the processing of agricultural products, which is usually carried out at the same time as the logistics cleaning of agricultural products. In this link, it is necessary to remove sediment, microorganisms, residual pesticides, etc. on the surface of agricultural products, so as to provide clean raw materials for the subsequent processing of agricultural products. At present, the commonly used disinfection method is to use hypochlorous acid solution for cleaning and disinfection, that is, adding sodium hypochlorite stock solution (the residual chlorine concentration is about 10%) and a certain acid solution (such as citric acid) to the cleaning water to make a certain pH value and Disinfectant with residual chlorine concentration. When the pH value of the sodium hypochlorite solution is between 5 and 6.5, the residual chlorine of hypochlorous acid accounts for more than 90% of the total residual chlorine; when the pH value exceeds 7.0, the residual chlorine ratio decreases significantly, and the chlorine in the solution mainly exists ⁱⁿ the form of OCl-. Because the disinfection ability of HClO molecule is much greater than that of ClO ^- , it is necessary to adjust the pH of the disinfectant to the interval of 5.5-7.0 to improve its disinfection ability. The higher the concentration of hypochlorous acid, the stronger the disinfection effect, but the excess chlorine will make the residual chlorine exceed the standard. Accurate and real-time control of the pH value and residual chlorine concentration of the disinfectant has become the key to determining the disinfection effect.

Utility model content

The technical problem to be solved by the utility model is aimed at the above-mentioned problems of the prior art, and provides an online measurement and control device for the sodium hypochlorite disinfectant used for the cleaning and disinfection of agricultural raw materials such as aquatic products, vegetables, and fruits in a washing machine.

In order to achieve the above purpose, the utility model provides an on-line measurement and control device for sodium hypochlorite disinfectant, which includes:

The liquid adding mechanism includes a liquid medicine bucket, the liquid medicine bucket is connected to the cleaning machine through a liquid addition pipeline, and a metering pump is arranged on the liquid addition pipeline;

The detection mechanism includes an on-line sampler, wherein a temperature sensor, a residual chlorine sensor and a pH sensor are provided in the on-line sampler, and the inlet and the outlet of the on-line sampler are respectively communicated with the cleaning tank of the cleaning machine through a sampling pipeline; and control The mechanism is respectively connected with the liquid adding mechanism and the detection mechanism.

The above-mentioned online measurement and control device for sodium hypochlorite disinfectant, wherein the detection mechanism further includes a flushing solenoid valve, the online sampler is provided with a flushing port, the flushing solenoid valve is installed on the flushing port, and the flushing solenoid valve passes through the The pipeline is connected to clean water.

The above-mentioned on-line measurement and control device for sodium hypochlorite disinfectant, wherein, a screen filter is also provided at the entrance of the on-line sampler.

The above-mentioned on-line measurement and control device for sodium hypochlorite disinfectant, wherein, the outlet of the on-line sampler is also provided with a sampling liquid injection check valve.

The above-mentioned on-line measurement and control device for sodium hypochlorite disinfectant, wherein, the sampling pipeline of the on-line sampler is also provided with a throttle valve, and the throttle valve is arranged at the inlet of the screen filter.

The online measurement and control device of the above-mentioned sodium hypochlorite disinfectant, wherein, the control mechanism includes a programmable logic controller, a PLC analog quantity module and a pH transmitter, and the PLC analog quantity module is connected with the programmable logic controller, so the The temperature sensor and the residual chlorine sensor are respectively connected with the PLC analog quantity module, and the pH transmitter is respectively connected with the pH sensor and the PLC analog quantity module.

In the above-mentioned on-line measurement and control device for sodium hypochlorite disinfectant, the control mechanism further comprises a touch screen, and the touch screen is connected with the programmable logic controller.

The above-mentioned on-line measurement and control device for sodium hypochlorite disinfectant, wherein the liquid medicine barrel includes a sodium hypochlorite liquid tank and a citric acid liquid tank, and a sodium hypochlorite metering pump is provided on the liquid adding pipeline of the sodium hypochlorite liquid tank, and the citric acid liquid tank is provided with a sodium hypochlorite metering pump. A citric acid metering pump is arranged on the liquid adding pipeline of the liquid medicine tank, and the programmable logic controller is respectively connected with the sodium hypochlorite metering pump and the citric acid metering pump.

The above-mentioned on-line measurement and control device for sodium hypochlorite disinfectant, wherein the liquid adding pipelines of the sodium hypochlorite liquid barrel and the citric acid liquid barrel are respectively provided with a sodium hypochlorite liquid injection one-way valve and a citric acid liquid injection one-way valve. The input end of the sodium hypochlorite metering pump is connected to the sodium hypochlorite liquid tank through a PVC pipeline of the liquid addition pipeline, and the output end of the sodium hypochlorite metering pump is connected to the sodium hypochlorite metering pump through a PE pipeline of the liquid addition pipeline. The sodium hypochlorite injection one-way valve is connected, the input end of the citric acid metering pump is connected to the citric acid liquid tank through another PVC pipeline of the liquid addition pipeline, and the output end of the citric acid metering pump passes through the The other PE pipeline of the liquid addition pipeline is connected with the citric acid liquid injection one-way valve.

The above-mentioned on-line measurement and control device for sodium hypochlorite disinfectant, wherein the pH value of the sodium hypochlorite disinfectant of the cleaning machine detected by the on-line sampler is 5.5-8.0, and the residual chlorine mass concentration is 20-200ppm.

The beneficial effects of the present utility model are:

The utility model is used in conjunction with a cleaning machine, and can automatically add hypochlorous acid cleaning and disinfecting liquid and control its pH value and residual chlorine concentration on-line. Based on the cleaning and disinfection process requirements of aquatic products, vegetables and other agricultural products, with PLC as the core controller, with related sensors, PLC analog modules, dosing metering pumps and other components, it can automatically control the pH of hypochlorous acid disinfectant online. The control target can be adjusted within a certain range. When the control disinfectant is slightly acidic, the effective chlorine ratio of hypochlorous acid is higher, which can achieve the required disinfection effect with a lower residual chlorine concentration and reduce the amount of disinfection. Chlorine residues in agricultural products; fully automatic operation after debugging, the monitoring interface is simple and intuitive, and the human-computer interaction is friendly.

The present utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but it is not intended to limit the present utility model.

Description of drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention.

where the reference number

1a Sodium hypochlorite solution bucket

1b Citric acid liquid bucket

2a Sodium hypochlorite metering pump

2b Citric acid metering pump

3a Sodium hypochlorite injection check valve

3b Citric acid injection check valve

3c Sampling and filling check valve

4 Strainer filter

5 Throttle valve

6 Temperature sensor

7 Flush solenoid valve

8 pH sensor

9 Residual chlorine sensor

10 In-Line Samplers

11 Programmable Logic Controller (PLC)

12 PLC analog module

13 Touch screen

14 pH transmitter

15 PVC pipes

16 PE pipeline

Detailed ways

Below in conjunction with accompanying drawing, structure principle and working principle of the present invention are described in detail:

Referring to FIG. 1 , FIG. 1 is a schematic structural diagram of an embodiment of the present invention. The on-line monitoring and control device for sodium hypochlorite disinfectant of the utility model comprises: a liquid adding mechanism, including a liquid medicine bucket, the liquid medicine bucket is connected to the cleaning machine through a liquid addition pipeline, and a metering pump is arranged on the liquid addition pipeline, and the medicine liquid tank is Sodium hypochlorite and citric acid solution are respectively placed in the liquid tank to realize the addition of sodium hypochlorite and citric acid solution; the metering pump receives the signal output by PLC and pumps the liquid; the liquid addition pipeline includes PVC pipeline 15 and PE pipe The circuit 16 is used to connect various components to form a channel for adding medicinal liquid; the detection mechanism is used to realize the online continuous sampling and detection of the cleaning and disinfecting liquid in the washing machine, including an online sampler 10, and the online sampler 10 is provided with a temperature sensor 6, residual chlorine sensor 9 and PH sensor 8, and provide suitable water flow and water pressure for temperature sensor 6, residual chlorine sensor 9 and PH sensor 8, temperature sensor 6, residual chlorine sensor 9 and PH sensor 8 realize the adjustment of respective indicators. detection, and output an electrical signal to the control mechanism to carry out the detection of the disinfectant, the inlet and outlet of the online sampler 10 are respectively connected with the cleaning tank of the cleaning machine through the sampling pipeline, and the multi-section PE pipeline 16 is connected to each component, The channel that forms the water to be tested; and the control mechanism, which are respectively connected with the liquid addition mechanism and the detection mechanism, and are used to obtain the detection results of each sensor, determine the addition rate of the sodium hypochlorite solution and the citric acid solution, and control the liquid addition of the metering pump to achieve The control of the whole machine and the calculation and control of the adding rate of the liquid medicine.

In this embodiment, the detection mechanism further includes a flushing solenoid valve 7, the online sampler 10 is provided with a flushing port, the flushing solenoid valve 7 is installed on the flushing port, and the flushing solenoid valve 7 is connected to the flushing port through a pipeline. Clear water connection. When the flushing solenoid valve 7 is closed, the system is in the detection state, and the water sample to be tested flows through the online sampler 10; every time the entire system of the online monitoring and control device of the sodium hypochlorite disinfectant is closed, the flushing solenoid valve 7 is automatically opened, and clean water flows through the flushing solenoid valve. 7, in order to realize the cleaning of each sensor. The inlet of the online sampler 10 is also provided with a screen filter 4, which can filter the water sample to be tested, and the disinfectant first flows through the screen filter 4 to remove solid impurity particles larger than 0.5 mm in the water, and then flows into the online sampler. Sampler 10 to avoid adverse effects on temperature sensor 6, residual chlorine sensor 9 and pH sensor 8. The outlet of the online sampler 10 is also provided with a sampling liquid injection check valve 3c. The sampling pipeline of the online sampler 10 is also provided with a throttle valve 5, the throttle valve 5 is arranged at the inlet of the screen filter 4, and the throttle valve 5 can control the amount of water entering the online sampler 10. Water flow to meet the working requirements of temperature sensor 6, residual chlorine sensor 9 and PH sensor 8.

The control mechanism of this embodiment includes a programmable logic controller 11, a PLC analog module 12, a pH transmitter 14 and necessary circuits, and realizes the acquisition of the sensor signals of the temperature sensor 6, the residual chlorine sensor 9 and the pH sensor 8, Transmission and analysis to obtain the detection result, and based on the detection result, the addition rate of the sodium hypochlorite solution and the citric acid solution is determined through the set algorithm, and the sodium hypochlorite metering pump 2a and the citric acid metering pump 2b are respectively controlled to carry out the corresponding liquid addition action. The PLC analog module 12 is connected to the programmable logic controller 11, the temperature sensor 6 and the residual chlorine sensor 9 are respectively connected to the PLC analog module 12, and the pH transmitter 14 is respectively connected to the The PH sensor 8 and the PLC analog module 12 are connected. The pH transmitter 14 transmits the electrical signal output by the pH sensor 8 and converts it into an electrical signal that the PLC analog module 12 can receive. The PLC analog module 12 receives the temperature sensor 6 , the residual chlorine sensor 9 and the pH transmitter 14 The sent electrical signal is converted into a digital quantity to the programmable logic controller 11 (PLC). The control mechanism may further include a touch screen 13, which is connected to the programmable logic controller 11, and displays the residual chlorine mass concentration and pH value on the touch screen 13, and can set control parameters through the touch screen 13. The programmable logic controller 11 (PLC) is the core controller, which is used to analyze the signal and control the dosing of the metering pump by installing a preset algorithm; the touch screen 13 is used to realize human-computer interaction, and its interface is intuitive and easy to operate. convenient.

In this embodiment, the liquid medicine tank includes a sodium hypochlorite liquid tank 1a and a citric acid liquid tank 1b, a sodium hypochlorite metering pump 2a is provided on the liquid adding pipeline of the sodium hypochlorite liquid tank 1a, and the citric acid liquid tank A citric acid metering pump 2b is arranged on the liquid addition pipeline of 1b, so as to realize the rate-controllable addition of the two liquid medicines. The programmable logic controller 11 is respectively connected with the sodium hypochlorite metering pump 2a and the citric acid metering pump 2b. A sodium hypochlorite liquid injection check valve 3a and a citric acid liquid injection one-way valve 3b are respectively provided on the liquid filling pipelines of the sodium hypochlorite liquid tank 1a and the citric acid liquid tank 1b, and the liquid injection one-way valve is used to ensure the liquid medicine. flow direction to prevent backflow; the input end of the sodium hypochlorite metering pump 2a is connected to the sodium hypochlorite liquid tank 1a through a PVC pipeline 15 of the liquid addition pipeline, and the output end of the sodium hypochlorite metering pump 2a passes through the A PE pipeline 16 of the liquid addition pipeline is connected to the sodium hypochlorite liquid injection check valve 3a, and the input end of the citric acid metering pump 2b is connected to the citric acid drug through another PVC pipeline 15 of the liquid addition pipeline. The liquid tank 1b is connected, and the output end of the citric acid metering pump 2b is connected to the citric acid liquid injection check valve 3b through another PE pipeline 16 of the liquid addition pipeline. The pH value of the sodium hypochlorite disinfectant detected by the online sampler 10 is 5.5-8.0, and the mass concentration of residual chlorine is 20-200 ppm.

The utility model belongs to equipment for cleaning and disinfection, which is used in conjunction with a cleaning machine, and can automatically add hypochlorous acid cleaning and disinfecting liquid and control its pH value and residual chlorine concentration on-line. When working, the disinfectant in the cleaning tank is sampled and flows through each sensor for detection. The electrical signal of the detection result is transmitted to the PLC. After calculation, the rate of addition of the two solutions is obtained, and the metering pump is controlled to add liquid to meet the required surplus. Chlorine and pH value requirements, used for on-line control of hypochlorous acid disinfectant in cleaning pools for agricultural products such as fruits and vegetables. The device can be used for cleaning and sterilizing raw materials of aquatic products, vegetables, fruits and other agricultural products in the washing machine. The pH value and residual chlorine concentration of hypochlorous acid disinfectant can be adjusted according to the needs of users. The pH value can be adjusted and effectively controlled at 5.5-8.0. Different cleaning and disinfection processes are required, and the control stability is high and the anti-interference ability is strong.

Of course, the present utility model can also have other various embodiments, without departing from the spirit and essence of the present utility model, those skilled in the art can make various corresponding changes and deformations according to the present utility model, but These corresponding changes and deformations should all belong to the protection scope of the appended claims of the present invention.

Claims (10)

1. The utility model provides an online measurement and control device of sodium hypochlorite antiseptic solution which characterized in that includes:

the liquid adding mechanism comprises a liquid medicine barrel, the liquid medicine barrel is connected with the cleaning machine through a liquid adding pipeline, and a metering pump is arranged on the liquid adding pipeline;

the detection mechanism comprises an online sampler, wherein a temperature sensor, a residual chlorine sensor and a PH sensor are arranged in the online sampler, and an inlet and an outlet of the online sampler are respectively communicated with a cleaning pool of the cleaning machine through a sampling pipeline; and

and the control mechanism is respectively connected with the liquid adding mechanism and the detection mechanism.

2. The on-line measurement and control device for sodium hypochlorite disinfectant as claimed in claim 1, wherein the detection mechanism further comprises a flushing solenoid valve, the on-line sampler is provided with a flushing port, the flushing solenoid valve is mounted on the flushing port, and the flushing solenoid valve is connected with clear water through a pipeline.

3. The online measurement and control device for sodium hypochlorite disinfectant as claimed in claim 1 or 2, wherein a filter screen is further disposed at the inlet of the online sampler.

4. The online measurement and control device for sodium hypochlorite disinfectant as recited in claim 3, wherein a sampling and liquid injection check valve is further disposed at an outlet of the online sampler.

5. The on-line measurement and control device for sodium hypochlorite disinfectant as claimed in claim 4, wherein a throttle valve is further disposed on the sampling pipeline of the on-line sampler, and the throttle valve is disposed at the inlet of the filter screen filter.

6. The device for online measurement and control of sodium hypochlorite disinfectant as claimed in claim 1 or 2, wherein the control mechanism comprises a programmable logic controller, a PLC analog quantity module and a pH transmitter, the PLC analog quantity module is connected with the programmable logic controller, the temperature sensor and the residual chlorine sensor are respectively connected with the PLC analog quantity module, and the pH transmitter is respectively connected with the pH sensor and the PLC analog quantity module.

7. The online measurement and control device for sodium hypochlorite disinfectant solution as claimed in claim 6, wherein the control mechanism further comprises a touch screen, and the touch screen is connected with the programmable logic controller.

8. The device for online measurement and control of sodium hypochlorite disinfectant as claimed in claim 6, wherein the liquid barrel comprises a sodium hypochlorite liquid barrel and a citric acid liquid barrel, a sodium hypochlorite metering pump is arranged on a liquid adding pipeline of the sodium hypochlorite liquid barrel, a citric acid metering pump is arranged on a liquid adding pipeline of the citric acid liquid barrel, and the programmable logic controller is respectively connected with the sodium hypochlorite metering pump and the citric acid metering pump.

9. The online measurement and control device for sodium hypochlorite disinfectant as claimed in claim 8, wherein the liquid adding pipelines of the sodium hypochlorite liquid barrel and the citric acid liquid barrel are respectively provided with a sodium hypochlorite liquid injecting one-way valve and a citric acid liquid injecting one-way valve, the input end of the sodium hypochlorite metering pump is connected with the sodium hypochlorite liquid barrel through a PVC pipeline of the liquid adding pipeline, the output end of the sodium hypochlorite metering pump is connected with the sodium hypochlorite liquid injecting one-way valve through a PE pipeline of the liquid adding pipeline, the input end of the citric acid metering pump is connected with the citric acid liquid barrel through another PVC pipeline of the liquid adding pipeline, and the output end of the citric acid metering pump is connected with the citric acid liquid injecting one-way valve through another PE pipeline of the liquid adding pipeline.

10. The on-line measurement and control device of sodium hypochlorite disinfectant as claimed in claim 8, wherein the pH value of the sodium hypochlorite disinfectant detected by the on-line sampler is 5.5-8.0, and the mass concentration of the residual chlorine is 20-200 ppm.

Images