CN115436303A - An integrated water quality COD detection device - Google Patents

Abstract

The invention relates to the technical field of COD (chemical oxygen demand) detection instruments, in particular to an integrated water quality COD detection device which mainly comprises a sample feeding device, a digestion cooling device and a detection system, wherein the sample feeding device is formed by combining a funnel-shaped liquid storage pool and a liquid inlet pipe connected with a two-position three-way electromagnetic valve, a water sample and a reagent in the liquid storage pool enter the digestion cooling device by controlling the two-position three-way electromagnetic valve, the digestion cooling device comprises a vacuum generator, a sealed microwave digestion box, a digestion colorimetric integrated pipe, a cooling pipe and a small fan, and the detection system is formed by a light emitting diode and a silicon photoelectric battery. The invention integrally adopts an integrated structure, thereby effectively solving the problems of complex operation and certain potential safety hazard in the process of detecting the water quality COD by using the rapid digestion spectrophotometry.

Description

An integrated water quality COD detection device

technical field

The invention relates to the technical field of COD detection instruments, in particular to an integrated water quality COD detection device.

Background technique

With the development of society, people pay more and more attention to environmental issues, and water quality safety is closely related to people's lives. COD (Chemical Oxygen Demand) is an important organic pollution parameter in the study of river pollution and the properties of industrial wastewater, as well as in the operation and management of wastewater treatment plants. However, the traditional method of detecting COD based on rapid digestion spectrophotometry needs to add water samples and reagents into the digestion tube first, then place the digestion tube in a heating device for digestion, take out the digestion tube after digestion, and transfer it after cooling. Putting liquid into a cuvette for detection, the actual operation steps are cumbersome, prone to human error, and the pipetting process also has certain safety hazards for operators.

Therefore, the prior art needs an integrated water quality COD detection device, which is used to solve the problems of cumbersome steps, long time consumption and potential safety hazards when measuring COD, and can improve the accuracy of measurement.

Contents of the invention

(1) Solved technical problems

Aiming at the deficiencies of the prior art, the present invention provides an integrated water quality COD detection device, which solves the problems that the existing equipment is prone to human error and the pipetting process also has certain safety hazards for operators.

(2) Technical solution

In order to achieve the above object, the present invention is achieved through the following technical solutions: an integrated water quality COD detection device, which is composed of a sampling device, a digestion cooling device and a detection system, and the sampling device includes a funnel-shaped liquid storage tank , a two-position three-way solenoid valve and a liquid inlet pipe, the funnel-shaped reservoir is connected with a two-position three-way solenoid valve, the liquid inlet pipe is connected with a two-position three-way solenoid valve, and the digestion cooling device includes a vacuum Generator, sealed microwave digestion box, digestion and colorimetric integrated tube, sealed digestion cover, cooling tube, small fan, vacuum partition 1 and vacuum partition 2, the vacuum generator is connected with two-position three-way solenoid valve, and digestion and colorimetry are integrated The tube is placed in the base of the sealed microwave digestion box. The two sides of the sealed microwave digestion box are microwave module one and microwave module two. A small fan is installed outside the microwave digestion box.

As a further preferred mode of the present invention, the detection system is a double-receiving-end photoelectric detection system, which is mainly composed of a light source driving module, two light-emitting diodes, two silicon photocells, and a signal conditioning circuit. The silicon photocell receiver is used for Receive the light of a specific wavelength emitted by the light-emitting diode, convert the received optical signal into an electrical signal, and filter and amplify the two electrical signals, and convert the electrical signal into a standard voltage that can be received by the analog input module of the industrial control board value; the signal conditioning circuit transforms the signal detected by the silicon photocell into a standard voltage value that can be input to the analog quantity acquisition module of the industrial control board after filtering and amplifying.

As a further preferred mode of the present invention, the liquid inlet pipe and the digestion sealing cover are of an integral structure, the liquid inlet pipe passes through the hole on the sealing digestion cover, and the relative position is fixed and sealed.

As a further preferred mode of the present invention, the top of the sealed microwave digestion box can be opened, and the opening devices located on both sides of the liquid inlet pipe are horizontal sliding door structures, and the digestion and colorimetric integrated tube in the microwave sealed digestion box is taken and placed.

As a further preferred mode of the present invention, the first vacuum partition and the second vacuum partition are of the horizontal extraction type, and each vacuum partition one and two vacuum partitions are located in the central digestion colorimetric integrated tube and both ends of the light-emitting diode or silicon. between photocell receivers.

As a further preferred mode of the present invention, the light-emitting diodes and silicon photocells are respectively located on both sides of the sealed microwave digestion box, a set of central connecting lines passes through the integrated digestion colorimetric tube, and the central connecting lines of the other group of light-emitting diodes and silicon photovoltaic cells are not connected to each other. Passing through the integrated digestion colorimetric tube, the lines connecting the circumference centers of the two pairs of light-emitting diodes and silicon photocells are parallel to each other and to the horizontal plane.

(3) Beneficial effects

The invention provides an integrated water quality COD detection device. Has the following beneficial effects:

The invention integrates liquid feeding, digestion cooling and detection, and solves the problems of cumbersome operation steps in the traditional process of COD detection based on rapid digestion spectrophotometry and certain safety hazards in the liquid pipetting process. The use of a digestion colorimetric integrated tube eliminates the need to transfer the digested water sample into the cuvette, which improves the efficiency. Microwave heating is used for digestion. Microwave heating is a direct body heating method. Microwaves can penetrate into the interior of the test solution. At different depths of the sample, the microwave will produce thermal effects at the same time. This not only makes the heating Faster and more uniform, which greatly shortens the heating time. Compared with traditional heating methods, it is fast and efficient. In the traditional heating methods (thermal radiation, conduction and convection), the utilization of heat energy is low, and a lot of heat is dissipated to the surrounding environment, while microwave heating directly acts on the interior of the material, thus improving the energy utilization rate. After the digestion is completed, let the test solution pass through the cooling tube, and then cooperate with a small fan to cool the test solution, which greatly speeds up the cooling rate.

The present invention adopts double receiving end photoelectric detection method to measure the COD value of the water sample, and the method can ensure that the incident light intensity and the transmitted light intensity are the values detected under the same conditions at the same time, and the incident light intensity and the transmitted light intensity are at the same It is detected under the irradiation of light with a wavelength, which solves the problems of low stability and real-time performance of the measured data when the single-receiving-end photoelectric detection method is used for detection.

Description of drawings

Fig. 1 is: the overall structure schematic diagram of the present invention;

Fig. 2 is a schematic diagram of the structure of the sealed microwave digestion box of the present invention.

In the figure: 1. Funnel-shaped reservoir; 2. Vacuum generator; 3. Two-position three-way solenoid valve; 4. Sealed digestion cover; 5. Digestion colorimetric integrated tube; 6. Microwave module 1; 7. Sealed microwave Digestion box; 8. Base; 9. Sample valve; 10. Microwave module two; 11. Small fan; 12. Cooling pipe; 13. Vacuum partition one; 14. Light-emitting diode one; 15. Light-emitting diode two; 16. Silicon photovoltaic cell receiver one; 17, silicon photovoltaic cell receiver two; 18, vacuum partition two.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to Figure 1-2, the embodiment of the present invention provides a technical solution:

A body-based water quality COD detection device, the COD detection device is composed of three parts: a sampling device, a digestion cooling device and a detection system.

The sampling device includes a funnel-shaped reservoir 1, a two-position three-way solenoid valve 3 and a liquid inlet pipe. The funnel-shaped liquid reservoir 1 is connected to port 3 of the two-position three-way solenoid valve 3. Connect to port 1 of solenoid valve 3.

First, the first position of the two-position three-way solenoid valve 3 is connected, so that ports 1 and 3 are opened, and port 2 is closed. The reagent and water sample flow through port 3 of the funnel-shaped reservoir 1 and enter port 1 of the inlet pipe. The integrated colorimetric tube 5 for digestion in the cooling device is digested, and the sampling valve 9 is in a closed state at this time.

The digestion and cooling device includes a vacuum generator 2, a sealed microwave digestion box 7, a digestion colorimetric integrated tube 5, a sealed digestion cover 4, a cooling tube 12 and a small fan 11, the vacuum generator 2 and the two-position three-way solenoid valve 3. The mouth is connected, and the integrated digestion and colorimetric tube 5 is placed in the base 8 in the sealed microwave digestion box 7. The microwave module 1 6 and the microwave module 2 10 are on both sides of the sealed microwave digestion box 7, and the bottom of the integrated digestion and colorimetric tube 5 is connected to the water pipe. , and connected to the cooling pipe 12 through the sampling valve 9, and a small fan 11 is installed outside the sealed microwave digestion box 7.

After the test solution enters the digestion and colorimetric integrated tube 5, the test solution is digested by the microwave modules 6 and 11 in the sealed microwave digestion box 7. After the digestion is completed, the liquid outlet valve 9 and the small fan 11 are opened, and the two The second position of the three-way solenoid valve 3 is connected, the ports 1 and 2 are opened, and the port 3 is closed, and the vacuum generator 22 is turned on to make the test liquid flow through the liquid outlet valve 9 through the cooling pipe 12, and under the action of the small fan 11 Perform rapid cooling, and when the test solution enters the funnel-shaped liquid storage tank 1, close the vacuum generator 2 and connect the first position of the two-position three-way solenoid valve 3, so that the test solution enters the vacuum colorimetric integrated tube, and use it again The second position of the two-position three-way solenoid valve 3 is connected, and the vacuum generator 2 is turned on to cool the test solution. When the test liquid is cooled to a temperature suitable for detection, the vacuum generator 2, the liquid outlet valve 9 and the small fan 11 are closed.

The double-receiving-end photoelectric detection system includes two light-emitting diodes, light-emitting diode one 14 and light-emitting diode two 15, and two silicon photocell receivers. Two silicon photocell receivers receive the light of a specific wavelength emitted by the light-emitting diode, convert the received optical signal into an electrical signal, and filter and amplify the two electrical signals, so that the electrical signal can be converted into a signal that can be simulated by the industrial control board. The standard voltage value received by the quantity input module, one voltage value is used as the incident light intensity, and the other road voltage value is used as the transmitted light intensity, wherein the incident light intensity is the silicon dioxide directly irradiated by the light-emitting diode without digestion and colorimetric tube 5 in Figure 2 The value corresponding to the photovoltaic cell, the transmitted light intensity is the value corresponding to the silicon photovoltaic cell irradiated by the light-emitting diode after passing through the digestion tube.

After the test solution is cooled, open the first vacuum partition 13 and the second vacuum partition 18 in Fig. 2, and measure the COD value of the water sample by the photoelectric detection method with double receiving ends.

The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and without departing from the spirit or fundamentals of the present invention. The present invention can be implemented in other specific forms without any specific features. Accordingly, the embodiments should be regarded in all points of view as exemplary and not restrictive, the scope of the invention being defined by the appended claims rather than the foregoing description, and it is therefore intended that the scope of the invention be defined by the appended claims rather than by the foregoing description. All changes within the meaning and range of equivalents of the elements are embraced in the present invention. Any reference sign in a claim should not be construed as limiting the claim concerned.

In addition, it should be understood that although this specification is described according to implementation modes, not each implementation mode only includes an independent technical solution, and this description in the specification is only for clarity, and those skilled in the art should take the specification as a whole , the technical solutions in the various embodiments can also be properly combined to form other implementations that can be understood by those skilled in the art.

Claims (6)

1. An integrated water quality COD detection device, this device is made up of sampling device, digestion cooling device and detection system, it is characterized in that: described sampling device comprises funnel shape reservoir (1), two-position three-way Solenoid valve (3) and liquid inlet pipe, described funnel-shaped reservoir (1) is connected with two-position three-way solenoid valve (3), and described liquid inlet pipe is connected with two-position three-way solenoid valve (3), so The digestion cooling device includes a vacuum generator (2), a sealed microwave digestion box (7), a digestion colorimetric integrated tube (5), a sealed digestion cover (4), a cooling tube (12), a small fan (11), a vacuum Partition one and vacuum partition two, the vacuum generator (2) is connected to the two-position three-way solenoid valve (3), and the digestion and colorimetric integrated tube (5) is placed on the base (8) in the sealed microwave digestion box (7) Among them, microwave module 1 and microwave module 2 are located on both sides inside the sealed microwave digestion box (7), and the bottom of the integrated digestion colorimetric pipe (5) is connected to the water outlet pipe, and connected to the cooling pipe (12) through the sampling valve (9) , a small fan (11) is installed outside the sealed microwave digestion box (7). 2. A kind of integrated water quality COD detection device according to claim 1, it is characterized in that, described detection system is double receiving end photoelectric detection system, mainly by light source driving module, two light-emitting diodes, two silicon photovoltaic cells Composed of a signal conditioning circuit, etc., the silicon photocell receiver is used to receive the light of a specific wavelength emitted by the light-emitting diode, convert the received optical signal into an electrical signal, and filter and amplify the two electrical signals. Convert it into a standard voltage value that can be received by the analog input module of the industrial control board; the signal conditioning circuit converts the signal detected by the silicon photocell into a standard voltage value that can be input to the analog acquisition module of the industrial control board after filtering and amplifying. 3. A kind of integrated water quality COD detection device according to claim 1, is characterized in that, described inlet pipe and digestion sealing cover are integrated structure, and inlet pipe passes through the hole on the sealing digestion cover (4) , the relative position is fixed and sealed. 4. An integrated water quality COD detection device according to claim 1, characterized in that the top of the sealed microwave digestion box (7) can be opened, and the opening devices located on both sides of the liquid inlet pipe are horizontal sliding doors structure, take and place the digestion and colorimetric integrated tube (5) in the microwave sealed digestion box. 5. A kind of integrated water quality COD detection device according to claim 1, is characterized in that, described vacuum partition one and vacuum partition two are horizontal extraction type, each vacuum partition one and vacuum partition two It is located between the central digestion colorimetric integrated tube (5) and the light-emitting diodes or silicon photocell receivers at both ends. 6. A kind of integrated water quality COD detection device according to claim 2, characterized in that, the light-emitting diodes and silicon photocells are respectively located on both sides of the sealed microwave digestion box (7), and a group of central connecting lines pass through the digestion Colorimetric integrated tube (5), another set of light-emitting diodes and silicon photocell center lines do not pass through the digestion colorimetric integrated tube (5), two pairs of light-emitting diodes and silicon photocells The circumferential center lines are parallel to each other and parallel to the horizontal plane .

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