CN204439647U - Laboratory COD automatic analyzer - Google Patents

Abstract

The utility model relates to an online water quality analyzer, in particular to a laboratory COD automatic analyzer. Including light detection metering device, digestion tank, electrode titration device. It also includes a syringe and a peristaltic pump, the lower end of the syringe communicates with the light detection and metering device through a three-way valve, the lower end of the light detection and metering device is equipped with a peristaltic pump, and the upper and lower ends of the digestion tank are respectively provided with two-way valves and A three-way valve, the top of the digestion tank is connected to the three-way valve at the lower end of the syringe through a two-way valve and a three-way valve, one end of the three-way valve at the lower end of the digestion tank is connected to the peristaltic pump, and the three-way valve at the lower end of the digestion tank is connected One end is connected with the electrode titration device. The utility model has a unique design and solves the problems of troublesome and large errors in the traditional liquid detection process. The utility model continuously and automatically monitors and analyzes water quality, saving time and effort. The device of the utility model is provided with a safety valve, which can balance the pressure in the digestion tank and increase the safety of the digestion tank.

Description

Laboratory COD automatic analyzer

technical field

The invention relates to an online water quality analyzer, in particular to a laboratory COD automatic analyzer.

Background technique

COD (Chemical Oxygen Demand) is a chemical method to measure the amount of reducing substances that need to be oxidized in a water sample. The oxygen equivalent of substances (generally organic matter) that can be oxidized by strong oxidants in wastewater, wastewater treatment plant effluent and polluted water. In the study of river pollution and industrial wastewater properties and the operation and management of wastewater treatment plants, it is an important and quickly determined organic pollution parameter.

The traditional water quality COD analyzer has a discontinuous working process and a high risk factor, which increases the work of the staff and is time-consuming and labor-intensive.

Contents of the invention

The technical problem to be solved by the present invention is how to overcome the deficiencies in the prior art and provide a laboratory COD automatic analyzer for continuous, convenient and timely water quality monitoring.

The technical solution of the present invention is: a laboratory COD automatic analyzer, including a photodetection metering device, a digestion tank, an electrode titration device, and a syringe and a peristaltic pump, the lower end of the syringe is connected to the photodetection metering device through a three-way valve The devices are connected, and a peristaltic pump is installed at the lower end of the light detection and metering device. Two-way valves and three-way valves are respectively provided at the upper and lower ends of the digestion tank. One end of the three-way valve at the lower end of the digestion tank communicates with the peristaltic pump, and the other end of the three-way valve at the lower end of the digestion tank is connected with the electrode titration device.

Preferably, the present invention also includes an auxiliary drug feeding system, which is connected to the electrode titration device through a drug feeding tube.

Preferably, the auxiliary feeding system is equipped with a peristaltic pump.

As preferably, the electrode titration device of the present invention comprises a magnetic stirrer, a titration cup and an electrode, the titration cup is located on the magnetic stirrer, the electrode extends into the titration cup, the lower end of the three-way valve at the lower end of the digestion tank is provided with a burette, The burette extends into the titration cup.

Preferably, the present invention also includes a waste liquid tank, and the waste liquid tank communicates with the electrode titration device through a discharge pipe.

Preferably, the discharge pipeline is provided with a two-way valve.

The invention has a unique design and solves the problems of troublesome and large errors in the traditional liquid detection process. The invention connects the optical detection and metering device, the digestion tank, the electrode titration device, the syringe and the peristaltic pump to ensure continuous and automatic water quality monitoring and analysis, saving time and effort. The device of the invention is provided with a safety valve, which can balance the pressure in the digestion tank and increase the safety of the digestion tank. The present invention adopts a three-way valve and a two-way valve to further ensure safety.

Description of drawings

The present invention will be further described below in conjunction with drawings and embodiments.

Fig. 1 is the schematic structural diagram of laboratory COD automatic analyzer;

Detailed ways

The laboratory COD automatic analyzer of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1 , the laboratory COD automatic analyzer includes a light detection and metering device 1 , a digestion tank 2 , an electrode titration device 3 , a syringe 4 and a peristaltic pump 5 . The connection mode of the above components is as follows: the lower end of the syringe 4 communicates with the photodetection and metering device 1 through a three-way valve a, so that the syringe 4 can give the pressure to the photodetection and metering device 1, and the lower end of the photodetection and metering device 1 is installed A peristaltic pump 5, through which the sample enters the photodetection metering device 1.

In order to ensure the safety of the digestion tank 2, the upper and lower ends of the digestion tank 2 are respectively provided with a two-way valve b and a three-way valve a from the inside to the outside, and the top of the digestion tank 2 is connected to the syringe through the two-way valve b and the three-way valve a 4. On the three-way valve a at the lower end, it is convenient to discharge the air bubbles in the digestion tank 2 and balance the pressure.

One end of the three-way valve a at the lower end of the digestion tank 2 communicates with the peristaltic pump 5, so that the sample can slowly enter the digestion tank 2 from the light detection and metering device 1 through the peristaltic pump 5 for digestion.

For the convenience of the next step, the other end of the three-way valve at the lower end of the digestion tank 2 is connected to the electrode titration device 3, so that the digested sample enters the electrode titration device 3 through the three-way valve a for titration reaction to confirm the content. The electrode titration device 3 of the present invention comprises a magnetic stirrer 31, a titration cup 32 and an electrode 33. The titration cup 32 is located on the magnetic stirrer 31, and the electrode 33 extends into the titration cup 32. A burette 21 is arranged at the lower end of the through valve a, and the burette 21 extends into the titration cup 32, so that the sample that is conveniently digested enters the burette 21 through the three-way valve a and then undergoes electrode titration. In order to realize the continuous process, the present invention also includes a waste liquid tank 6, which is directly connected to the lower end of the titration cup 32 through a discharge pipe, and the discharge pipe is also provided with a two-way valve b for easy opening and closing.

In order to ensure sample detection, the present invention also includes an auxiliary drug feeding system 7, which is directly connected to the titration cup 32 through a drug feeding tube 71. For the convenience of drug feeding, the drug feeding system 7 is provided with a peristaltic pump, which is convenient. The drug enters at a uniform rate.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (6)

1. laboratory COD automatic analyzer, comprises light detection metering device, digestion tank, electrode titration device, is characterized in that: also comprises syringe and peristaltic pump, and described syringe lower end communicates with described light detection metering device by three-way valve, A peristaltic pump is installed at the lower end of the optical detection and metering device, and a two-way valve and a three-way valve are respectively provided at the upper and lower ends of the digestion tank, and the upper end of the digestion tank is connected to the three-way valve at the lower end of the syringe through the two-way valve and the three-way valve, One end of the three-way valve at the lower end of the digestion tank communicates with the peristaltic pump, and the other end of the three-way valve at the lower end of the digestion tank is connected with the electrode titration device. 2 . The laboratory COD automatic analyzer according to claim 1 , further comprising an auxiliary drug feeding system connected to the electrode titration device through a drug feeding tube. 3 . 3. The laboratory COD automatic analyzer according to claim 2, characterized in that: the auxiliary medicine feeding system is equipped with a peristaltic pump. 4. laboratory COD automatic analyzer according to claim 1 or 2, is characterized in that: described electrode titration device comprises magnetic stirrer, titration cup and electrode, and described titration cup is positioned at magnetic stirrer, and electrode stretches into In the titration cup, a burette is provided at the lower end of the three-way valve at the lower end of the digestion tank, and the burette extends into the titration cup. 5. The laboratory COD automatic analyzer according to claims 1 to 4, characterized in that it also includes a waste liquid tank, and the waste liquid tank communicates with the electrode titration device through a discharge pipe. 6. The laboratory COD automatic analyzer according to claim 5, characterized in that: the discharge pipeline is provided with a two-way valve.