A permanganate index analyzer

Abstract

The invention discloses a permanganate index analyzer, comprising a multi-way valve assembly, a peristaltic pump, a digestion assembly and a drainage assembly. The multi-way valve assembly comprises a plurality of channels, all of which are connected to the inlet of the peristaltic pump, and all of which are provided with switch valves. When extracting samples or reagents, the corresponding switch valve is opened so that the corresponding channel is connected to the inlet of the peristaltic pump. The peristaltic pump rotates to send the solution into the digestion cup of the digestion assembly, and the heating structure heats the solution in the digestion cup. The sample and the reagent react in the digestion cup to complete the permanganate index determination. The drainage assembly then discharges the determined solution. The permanganate index analyzer uses the multi-way valve assembly in conjunction with the peristaltic pump to complete the extraction of samples and reagents. The flow path of the permanganate index analyzer is simplified, the manufacturing cost and maintenance cost are reduced, and the failure rate of the permanganate index analyzer is reduced, and its stability and convenience are improved.

Description

Technical Field

[0001] The invention relates to the technical field of water environment online monitoring equipment, and in particular to a permanganate index analyzer. Background Art

[0002] The permanganate index in surface water is a common indicator of organic and inorganic oxidizable pollution in water bodies. The permanganate titration method is often used to detect the permanganate index in the process of automatic monitoring of surface water. The specific method of the permanganate titration method is: take a certain volume of water sample, add appropriate amounts of potassium permanganate and sulfuric acid, mix thoroughly and digest for a certain period of time, then add excess sodium oxalate for reduction, and finally slowly add potassium permanganate. The titration end point is determined by the potential value or color mutation of the reaction solution, and the permanganate index of the water sample is inferred based on the consumption of the oxidant.

[0003] The permanganate index of surface water is usually measured by automatic detection instruments. The measurement process of the permanganate index is affected by many conditions. To ensure accurate measurement results, it is necessary to strictly control factors such as oxidant content, reductant content, sampling volume, acidity, heating temperature, digestion time and titration endpoint determination. Among them, heating temperature, sampling volume and reagent measurement accuracy play a vital role in the operational stability of automatic detection instruments.

[0004] In the prior art, automatic detection instruments usually use multiple peristaltic pumps to extract water samples, oxidants, reductants, etc. respectively, which makes the flow path of the automatic detection instrument complicated and brings great difficulties to subsequent operation and maintenance.

[0005] Therefore, how to provide a permanganate index analyzer with a simple flow path and stability is a technical problem that technicians in this field urgently need to solve. Summary of the invention

[0006] The purpose of the present invention is to provide a permanganate index analyzer, which connects the inlet of a peristaltic pump with different channels through a multi-way valve assembly to achieve the extraction of samples and reagents, thereby simplifying the structure of the flow path.

[0007] To achieve the above object, the present invention provides a permanganate index analyzer, comprising:

[0008] Peristaltic pump for extracting samples and reagents;

[0009] A multi-way valve assembly, comprising a plurality of channels, all of which are connected to the inlet of the peristaltic pump, and all of which are provided with switch valves;

[0010] A digestion component, comprising a digestion cup for mixing samples and reagents and a heating mechanism for heating the solution in the digestion cup, wherein the digestion cup is connected to the outlet of the peristaltic pump;

[0011] A liquid discharge component is connected to the digestion cup and is used for discharging the solution in the digestion cup.

[0012] Preferably, the multi-way valve assembly includes two six-way valves, the six-way valve includes 6 channels and a main channel, all of the channels are connected to the main channel, the two six-way valves are respectively a first six-way valve and a second six-way valve, the main channel of the first six-way valve is connected to one of the channels of the second six-way valve, and the main channel of the second six-way valve is connected to the inlet of the peristaltic pump.

[0013] Preferably, the drainage assembly includes a drainage pipe connected to the digestion cup, a waste liquid recovery pump for sending waste liquid into the drainage system, and a waste liquid direct discharge pump for directly discharging waste liquid.

[0014] Preferably, an electromagnetic drain valve is provided in the drain pipe.

[0015] Preferably, the drainage assembly further comprises a drainage nozzle, the drainage pipe is connected to the drainage nozzle, and the drainage nozzle and the digestion cup are an integrally formed structural component.

[0016] Preferably, the heating mechanism is a heating belt wound around the outer circumference of the digestion cup, and the heating belt is connected to a fuse for preventing overheating.

[0017] Preferably, a liquid level detector for detecting the liquid level in the liquid intake pipeline is provided between the multi-way valve assembly and the peristaltic pump.

[0018] Preferably, the digestion component further comprises a cooling fan for reducing the temperature of the digestion cup.

[0019] Preferably, the digestion component further comprises a magnetic stirring mechanism for stirring the solution in the digestion cup, and the magnetic stirring mechanism comprises a magnetic stirring motor, a motor fixing seat and a magnetic stirring bar arranged in the digestion cup.

[0020] Preferably, the digestion component further comprises an ORP electrode mechanism for detecting parameters of the solution in the digestion cup.

[0021] The permanganate index analyzer provided by the present invention includes a multi-way valve assembly, a peristaltic pump, a digestion assembly and a drainage assembly. Among them, the multi-way valve assembly includes multiple channels, all of which are connected to the inlet of the peristaltic pump, and all of the channels are provided with switch valves. When extracting samples or reagents, the corresponding switch valve is opened so that the corresponding channel is connected to the inlet of the peristaltic pump. The peristaltic pump rotates to send the solution into the digestion cup of the digestion assembly, and the heating mechanism heats the solution in the digestion cup. The sample and the reagent react in the digestion cup to complete the permanganate index determination. The drainage assembly then discharges the measured solution.

[0022] The permanganate index analyzer uses a multi-way valve assembly in conjunction with a peristaltic pump to extract samples and reagents, which simplifies the flow path of the permanganate index analyzer, reduces manufacturing and maintenance costs, and reduces the failure rate of the permanganate index analyzer, improving its stability and convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0024] Figure 1 This is a front view of the permanganate index analyzer provided by the present invention;

[0025] Figure 2 for Figure 1 Schematic diagram of the structure of the middle cabinet;

[0026] Figure 3 for Figure 1 Side view of the medium permanganate index analyzer;

[0027] Figure 4 This is a schematic diagram of the flow path structure in the permanganate index analyzer.

[0028] in, Figures 1 to 4 The reference numerals in the drawings are:

[0029] Cabinet 1, multi-way valve assembly 2, liquid level detector 3, peristaltic pump 4, digestion assembly 5, electromagnetic drain valve 6, waste liquid recovery pump 7, waste liquid direct discharge pump 8, display screen 9, upper cabinet 11, middle cabinet 12, lower cabinet 13, heat dissipation port 14, middle cabinet door 15, first six-way valve 21, second six-way valve 22, digestion cup 51, ORP electrode mechanism 52, magnetic stirring mechanism 53, heating belt 54. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0032] Please refer to Figures 1 to 4 , Figure 1 This is a front view of the permanganate index analyzer provided by the present invention; Figure 2 for Figure 1 Schematic diagram of the structure of the middle cabinet; Figure 3 for Figure 1 Side view of the medium permanganate index analyzer; Figure 4 This is a schematic diagram of the flow path structure in the permanganate index analyzer.

[0033] The permanganate index analyzer provided by the present invention comprises a cabinet 1 and a flow path. Figure 1 As shown, the cabinet 1 includes an upper cabinet 11, a middle cabinet 12 and a lower cabinet 13, and the flow path is arranged in the middle cabinet 12. Specifically, the flow path includes a multi-way valve assembly 2, a peristaltic pump 4, a digestion assembly 5 and a liquid discharge assembly. Among them, the multi-way valve assembly 2 includes a plurality of channels, each of which is provided with a switch valve. All channels are connected to the liquid collection pipeline, and the liquid collection pipeline is connected to the digestion assembly 5, which is used to deliver samples and reagents into the digestion cup 51 of the digestion assembly 5. The peristaltic pump 4 is arranged in the liquid collection pipeline to provide power for the solution. During the detection process, when a certain solution needs to be extracted, the corresponding switch valve is opened to connect the corresponding channel with the liquid collection pipeline, and the solution is delivered into the digestion cup 51 after being pressurized by the peristaltic pump 4.

[0034] The peristaltic pump 4 can complete the metering of the sample, oxidant, acid and reducing agent. In a specific embodiment of the present application, 80 ml of sample, 8 ml of oxidant, 4 ml of acid and 8 ml of reducing agent are required, and each substance can be quantitatively extracted by the peristaltic pump 4, thereby ensuring the accuracy of the test results. Moreover, the peristaltic pump 4 also has a reversing function, which can make the excess reagent flow back to the storage container to avoid reagent waste.

[0035] Optionally, the structure of the multi-way valve assembly 2 can refer to Figure 4, the multi-way valve assembly 2 includes two six-way valves, each of which includes 6 channels and 1 main channel, and all channels are connected to the main channel. The two six-way valves are respectively the first six-way valve 21 and the second six-way valve 22, the main channel of the first six-way valve 21 is connected to a channel of the second six-way valve 22, and the main channel of the second six-way valve 22 is connected to the inlet of the peristaltic pump 4. Therefore, the multi-way valve assembly 2 has a total of 12 channels, which are marked with letters AL respectively, among which the F channel is a connecting channel for connecting the main channel of the first six-way valve 21, and the other 11 channels can be used to extract different materials. Specifically, channel A is connected to pure water, channel B is connected to oxidant, channel C is connected to reductant, channel D is connected to acid, channel E is connected to alkali solution, and channel G is connected to air, and the above channels are all reagent channels. During the liquid extraction process, the liquid channel is first connected to the peristaltic pump 4, and the peristaltic pump 4 rotates to extract a preset dose of liquid. Then the switch valve of the channel is closed, and the air channel is connected to the peristaltic pump 4. The peristaltic pump 4 continues to rotate, and the liquid is transported to the digestion cup 51 through the air. The H channel connects the standard sample, the I channel is used for span verification, and the J channel is used for zero point verification. The three are verification channels. The K channel is the calibration channel, and the L channel is the water sample channel. Each channel is provided with a switch valve, which remains in a normally closed state, and the operator opens each channel as needed. The use of each channel can realize a variety of operations such as the determination of the permanganate index of water samples, equipment cleaning, verification, and verification. Of course, the user can also set the function of each channel according to his own needs, which is not limited here.

[0036] Optionally, a liquid level detector 3 is provided between the multi-way valve assembly 2 and the peristaltic pump 4. Specifically, the liquid level detector 3 is a bubble sensor, which determines the position of the liquid by detecting the position of the bubble in the liquid extraction pipeline. In addition, when the peristaltic pump 4 is continuously running, and the liquid level detector 3 is still unable to detect the position of the liquid, it means that the reagent in the permanganate index analyzer has been consumed. The permanganate index analyzer can be provided with an alarm mechanism connected to the liquid level detector 3 to prompt the operator to replenish the reagent.

[0037] Optionally, the digestion component 5 also includes a heating mechanism and an ORP (Oxidation-Reduction Potential) electrode mechanism. The process of determining the permanganate index of surface water is as follows: first, extract the sample into the digestion cup 51, then heat the sample to 95°C through the heating mechanism, then add potassium permanganate to the sample to oxidize the sample, add excess sodium oxalate to the digestion cup 51 after oxidation is completed for reduction, and finally drop potassium permanganate into the digestion cup 51. The ORP electrode mechanism 52 can detect whether potassium permanganate has completely reacted with sodium oxalate. When the excess sodium oxalate is completely consumed, the permanganate index of the sample can be calculated based on the amount of potassium permanganate dropped.

[0038] Optionally, a sample inlet is provided on the upper part of the digestion component 5, and the liquid collection pipeline drips the sample and reagent into the digestion cup 51 through the sample inlet. To avoid the situation of hanging droplets and reduce the error of the titration process, the end of the liquid collection pipeline is immersed in the solution in the digestion cup 51.

[0039] Optionally, the heating mechanism is a heating belt 54 wound around the periphery of the digestion cup 51. The contact area between the heating belt 54 and the digestion cup 51 is larger, so the heating efficiency is higher. In a specific embodiment of the present application, the heating belt 54 is spirally wound around the bottom of the digestion cup 51 to 2 / 3 of the height. In addition, the heating belt 54 is also connected to a fuse. When the temperature of the heating belt 54 exceeds 140°C, the fuse blows to protect the digestion assembly 5 and other components.

[0040] Furthermore, the digestion process needs to maintain a constant temperature, so the digestion assembly 5 also includes a heat dissipation fan, and the side wall of the middle cabinet 12 is also provided with a heat dissipation port 14 that penetrates along the thickness direction. The heat dissipation fan blows air toward the digestion cup 51, and the air after heat exchange with the digestion cup 51 flows out from the heat dissipation port 14, thereby maintaining a constant temperature during the digestion process.

[0041] Furthermore, in order to speed up the reaction speed of the sample and each reagent, the digestion component 5 also includes a stirring mechanism. Specifically, the stirring mechanism is a magnetic stirring mechanism 53, and the magnetic stirring mechanism 53 includes a magnetic stirring motor, a motor fixing seat and a magnetic stirring bar. Figure 2 As shown, the stirring motor is arranged below the digestion cup 51 and connected to the middle cabinet 12 through the motor fixing seat, and the magnetic stirring bar is arranged in the digestion cup 51. The rotation of the stirring motor can drive the magnetic stirring bar to rotate, thereby completing the solution stirring. The stirring motor usually adopts a speed regulating motor, and the stirring speed of the solution can be changed by adjusting the motor speed.

[0042] Optionally, the digestion cup 51 is made of transparent heat-resistant glass, which has the advantages of high temperature resistance, acid and alkali resistance, and good stability. The digestion component 5 is provided with a window for observing the color of the solution in the digestion cup 51. The user can accurately judge the reaction end point by combining manual judgment and the ORP electrode mechanism 52. In addition, the middle cabinet door 15 is provided with an observation window. After the middle cabinet door 15 is closed, the operator can also observe the color of the digestion cup 51 through the observation window, and then judge whether the detection is completed.

[0043] After the sample analysis is completed, the solution in the digestion cup 51 needs to be discharged and the digestion cup 51 needs to be rinsed in preparation for the next sample analysis. Therefore, the digestion cup 51 is connected to the drainage component. Specifically, the drainage component includes a drainage pipe and a drainage pump. An electromagnetic drainage valve 6 is provided in the drainage pipe. When the electromagnetic drainage valve 6 is opened, the drainage component drains.

[0044] Optionally, the digestion cup 51 has a liquid discharge nozzle, and the two are integrally formed structural parts. The liquid discharge nozzle is an open liquid discharge channel, and the liquid discharge pipe is connected to the liquid discharge nozzle. After the electromagnetic liquid discharge valve 6 is opened, the solution enters the liquid discharge pipe through the liquid discharge nozzle.

[0045] The liquid discharge pump includes a waste liquid recovery pump 7 and a waste liquid direct discharge pump 8. The lower cabinet 13 of the permanganate index analyzer is used to store reagents, samples and pure water. At the same time, a waste liquid recovery bucket and a waste liquid storage bucket are also provided in the lower cabinet 13. The recovered waste liquid and the direct discharge waste liquid are respectively discharged into the waste liquid recovery bucket and the waste liquid storage bucket, and then the waste liquid is processed by the liquid discharge system.

[0046] In addition, a display screen 9 is installed on the front side of the upper cabinet 11, and a connection port is provided on the side of the upper cabinet 11. The upper cabinet 11 is internally installed with electronic function integrated boards such as a main control board, a detection board, and a communication board, and a transformer power supply for power supply. Among them, the main control board is connected to the display screen 9, the detection board, the communication board, and the components such as the peristaltic pump 4, the electromagnetic drain valve 6, the ORP electrode mechanism 52, the magnetic stirring mechanism 53, and the liquid level detector 3 in the flow path through a communication connection line, and the flow path operates under the control of the main control board. The structure of the main control board can refer to the prior art and will not be described here. The display screen 9 can use a touch screen or be equipped with components such as a control keyboard. The user can read parameters such as test data, work logs, and calibration curves through the display screen 9, and can also set the operating parameters of the instrument and manually debug the instrument.

[0047] Optionally, the main control board can be connected to the display screen 9 via the RS485 main line and send data or alarm signals to the display screen 9. The main control board identifies the function of the component through the ID number of the MODBUS protocol. Of course, the main control board can only be used as a platform for data input, output and display without data processing. The communication board is used to connect the industrial computer and the instrument display screen 9 to control and measure in an online automatic mode. The communication board can also be responsible for information transmission only without any data processing.

[0048] In this embodiment, the permanganate index analyzer realizes the extraction of samples and reagents by cooperating with the multi-way valve assembly 2 and the peristaltic pump 4. The number of peristaltic pumps 4 in the analyzer is reduced, thereby simplifying the structure of the analyzer, saving enterprise costs, and facilitating later operation and maintenance. In addition, the electronic control part and the reagent storage part in the permanganate index analyzer are separated, which avoids damage to the electronic control part due to excessive reagents or humidity, and prolongs the service life and stability of the permanganate index analyzer.

[0049] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0050] The above is a detailed introduction to the permanganate index analyzer provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention, and the description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A permanganate index analyzer, characterized in that: The invention comprises a cabinet (1) and a flow path, wherein the cabinet (1) comprises an upper cabinet (11), a middle cabinet (12) and a lower cabinet (13), and the flow path is arranged in the middle cabinet (12), and the flow path comprises: A peristaltic pump (4) for extracting samples and reagents; A multi-way valve assembly (2) comprising a plurality of channels, all of which are connected to the inlet of the peristaltic pump (4), and all of which are provided with switch valves; A digestion assembly (5), comprising a digestion cup (51) for mixing a sample and a reagent and a heating mechanism for heating a solution in the digestion cup (51), wherein the digestion cup (51) is connected to an outlet of the peristaltic pump (4); A liquid discharge component connected to the digestion cup (51) and used for discharging the solution in the digestion cup (51); The multi-way valve assembly (2) comprises two six-way valves, the six-way valves comprising six channels and one main channel, all of the channels are connected to the main channel, the two six-way valves are respectively a first six-way valve (21) and a second six-way valve (22), the main channel of the first six-way valve (21) is connected to one of the channels of the second six-way valve (22), and the main channel of the second six-way valve (22) is connected to the inlet of the peristaltic pump (4); The multi-way valve assembly (2) has a total of 12 channels, which are marked with letters AL respectively; The F channel is a connecting channel, which is used to connect the main channel of the first six-way valve (21); the A channel is connected to pure water, the B channel is connected to an oxidant, the C channel is connected to a reducing agent, the D channel is connected to an acid solution, the E channel is connected to an alkali solution, and the G channel is connected to air; the liquid channel is connected to the peristaltic pump (4), and the peristaltic pump (4) rotates to extract a preset dose of liquid, and then the switch valve of the channel is closed, and the air channel is connected to the peristaltic pump (4), and the peristaltic pump (4) continues to rotate to transport the liquid to the digestion cup (51) through the air; The H channel is connected to the standard sample, the I channel is used for span verification, and the J channel is used for zero point verification. The three are verification channels, the K channel is the calibration channel, and the L channel is the water sample channel; A liquid level detector (3) is provided between the multi-way valve assembly (2) and the peristaltic pump (4), and the liquid level detector (3) is connected to an alarm mechanism; When the peristaltic pump (4) is continuously running, the liquid level detector (3) does not detect the position of the liquid, indicating that the reagent has been consumed, and the alarm mechanism prompts the operator to replenish the reagent; The heating mechanism is a heating belt (54) wound around the outer circumference of the digestion cup (51), the heating belt (54) is connected to a fuse for preventing overheating, the heating belt (54) is spirally wound around the bottom of the digestion cup (51) to 2 / 3 of the height, and when the temperature of the heating belt (54) exceeds 140° C., the fuse is blown; The digestion assembly (5) further comprises a heat dissipation fan for lowering the temperature of the digestion cup (51); the side wall of the middle cabinet (12) is further provided with a heat dissipation port (14) penetrating along the thickness direction; the heat dissipation fan blows air toward the digestion cup (51), and the air after heat exchange with the digestion cup (51) flows out from the heat dissipation port (14); The digestion component (5) also includes an ORP electrode mechanism (52) for detecting parameters of the solution in the digestion cup (51); The peristaltic pump (4) also has a reversing function, which can allow excess reagent to flow back into the storage container; The digestion component (5) is provided with a sample inlet at the top, and a liquid collection pipeline drips the sample and the reagent into the digestion cup (51) through the sample inlet, and the end of the liquid collection pipeline is immersed in the solution in the digestion cup (51); The digestion cup (51) is made of transparent heat-resistant glass, and the digestion component (5) is provided with a window for observing the color of the solution in the digestion cup (51). The user can accurately judge the reaction endpoint through manual judgment combined with the ORP electrode mechanism (52).

2. The permanganate index analyzer according to claim 1, characterized in that: The liquid discharge assembly comprises a liquid discharge pipe connected to the digestion cup (51), a waste liquid recovery pump (7) for sending waste liquid into the liquid discharge system, and a waste liquid direct discharge pump (8) for directly discharging waste liquid.

3. The permanganate index analyzer according to claim 2, characterized in that: An electromagnetic liquid discharge valve (6) is provided in the liquid discharge pipe.

4. The permanganate index analyzer according to claim 3, characterized in that: The liquid discharge assembly further comprises a liquid discharge nozzle, the liquid discharge pipe is connected to the liquid discharge nozzle, and the liquid discharge nozzle and the digestion cup (51) are integrally formed structural parts.

5. The permanganate index analyzer according to any one of claims 1 to 4, characterized in that: The digestion component (5) further comprises a magnetic stirring mechanism (53) for stirring the solution in the digestion cup (51), wherein the magnetic stirring mechanism (53) comprises a magnetic stirring motor, a motor fixing seat and a magnetic stirring bar arranged in the digestion cup (51).

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