Water quality on-line monitor

Abstract

The embodiment of the utility model discloses a water quality on-line monitor which comprises an extrusion type peristaltic pump, a reagent bottle and a digestion detection system, the extrusion type peristaltic pump is used for quantitatively sampling liquid in the reagent bottle, and the extrusion type peristaltic pump is connected with the digestion detection system through a pipeline; the extrusion type peristaltic pump adopts the extrusion block to press the pump pipe. According to the scheme, the extrusion type peristaltic pump is used for replacing a combination of a rotary type peristaltic pump and an infrared quantitative system, the liquid amount is quantified by the extrusion type peristaltic pump independently, the single-circle liquid discharge amount is fixed, the precision can reach + / -2%, the precision is higher than that of the rotary type peristaltic pump, the infrared quantitative system is omitted, and the whole equipment is simpler. In addition, due to the fact that the extrusion type peristaltic pump has the advantage of prolonging the service life of the hose, the service life of the whole water quality online monitor can be prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of water quality monitoring, and in particular to an online water quality monitoring instrument. Background Art

[0002] The existing online water quality analyzers used in the environmental protection field generally use a rotary peristaltic pump to provide power for the liquid to be tested and the reagent. However, due to the pulsation when the rotary peristaltic pump transmits the liquid, its transmission accuracy is not high. Therefore, a separate infrared quantitative system needs to be set up in the water quality analyzer for quantitative calculation, which increases the complexity of the overall structure of the machine. In addition, the infrared quantitative system is unstable and easily damaged. Summary of the invention

[0003] To solve the above technical problems, the embodiments of this specification are implemented as follows:

[0004] An embodiment of the present specification provides an online water quality monitor, comprising: an extrusion type peristaltic pump, a reagent bottle and a digestion detection system, wherein the extrusion type peristaltic pump is used for quantitative sampling of the liquid in the reagent bottle, the extrusion type peristaltic pump is connected to the digestion detection system through a pipeline, and the extrusion type peristaltic pump uses an extrusion block to press the pump tube.

[0005] Optionally, the monitor further includes: a multi-channel sampling system, wherein the multi-channel sampling system is respectively connected to the extrusion peristaltic pump and the digestion detection system.

[0006] Optionally, the digestion detection system includes: a digestion tank, an ultraviolet lamp, a detection light source and a light detector, end covers are arranged at the upper and lower ends of the digestion tank, the detection light source and the light detector are arranged opposite to each other outside the digestion tank, and the ultraviolet lamp is arranged outside the digestion tank.

[0007] Optionally, the digestion detection system further includes: a temperature control device, wherein the temperature control device is disposed inside the digestion tank.

[0008] Optionally, there are multiple reagent bottles, which can be used to store water samples and reagents. The multi-channel sampling system includes: a multi-way valve, which is used to connect the extrusion peristaltic pump and the multiple reagent bottles, and one channel of the multi-way valve is connected to the digestion tank.

[0009] Optionally, the monitor further includes: a temporary storage chamber, wherein the temporary storage chamber is used to connect the extrusion peristaltic pump and the multi-way valve.

[0010] Optionally, the monitor further includes: a waste liquid bottle, wherein the waste liquid bottle is connected to the digestion tank via a pipeline.

[0011] Optionally, the waste liquid bottle is connected to a channel of the multi-way valve.

[0012] Optionally, the monitor further includes: a control system, wherein the control system is used to control the extrusion peristaltic pump, the multi-channel sampling system and the digestion detection system.

[0013] Optionally, the control system of the extrusion peristaltic pump is a servo system.

[0014] At least one of the above technical solutions adopted in the embodiments of this specification can achieve the following beneficial effects:

[0015] This solution uses an extrusion peristaltic pump to replace the combination of a rotary peristaltic pump and an infrared quantitative system. The extrusion peristaltic pump alone completes the quantitative measurement of the liquid. The single-turn discharge volume is fixed, and the accuracy can reach ±2%, which is higher than the accuracy of the rotary peristaltic pump. In addition, the infrared quantitative system is omitted, and the overall equipment is simpler. In addition, since the extrusion peristaltic pump itself has the advantage of extending the service life of the hose, it can extend the life of the entire water quality online monitoring instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 It is a schematic diagram of the structure of the water quality online monitoring instrument;

[0018] Figure 2 It is a structural schematic diagram of an extrusion peristaltic pump;

[0019] Figure 3 It is a schematic diagram of the internal structure of an extrusion peristaltic pump;

[0020] Figure numerals: 1. extrusion peristaltic pump; 2. multi-way valve; 3. pipeline; 4. reagent bottle; 5. valve circuit; 6. end cover; 7. ultraviolet lamp; 8. detection light source; 9. digestion tank; 10. light detector; 11. temperature control device; 12. waste liquid bottle; 13. temporary storage room; 23. liquid inlet cut-off block; 24. working pressure block; 25. liquid discharge cut-off block; 26. camshaft. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0022] The technical solutions provided by various embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0023] The water quality online monitoring instrument provided in this manual includes a control system, a quantitative sampling system and a digestion detection system. After the quantitative sampling system takes quantitative samples, the water sample to be tested and various reagents enter the digestion detection system. In the digestion detection system, the water sample to be tested is irradiated with an ultraviolet lamp for a digestion reaction, and then online detection is performed.

[0024] The control system is an embedded control system with a preset control program, which is used to control the quantitative sampling system and the digestion detection system to work according to the control logic. In addition, the control system also provides a human-computer dialogue window, which can realize the system configuration of the online water quality monitor and the parameter configuration during the measurement process through the keyboard, mouse or touch screen, so as to realize the fully automatic and reliable operation of the online water quality monitor without supervision.

[0025] It should be emphasized that the quantitative sampling system in this solution uses an extrusion peristaltic pump for quantitative sampling, wherein a multi-channel sampling module can be used for multiple samplings, for example, a multi-way valve connection is used, that is, the extrusion peristaltic pump is connected to multiple reagent bottles through a multi-way valve, and different reagent bottles store different liquids, such as standard water samples, water samples to be tested, various reagents, etc. When different liquids are needed, the corresponding channels are controlled to open.

[0026] In order to facilitate operation, a temporary storage room can also be set up to store the liquid sucked by the extrusion peristaltic pump in the temporary storage room and then transmit it to the digestion detection system.

[0027] Among them, the digestion detection system is a device that can perform both ultraviolet digestion and optical detection. It is a closed device, including a digestion tank, an ultraviolet lamp, a detection light source and a light detector. End covers are set at the upper and lower ends of the digestion tank, at least two ultraviolet lamps are set outside the digestion tank, a detection light source is set on one side of the digestion tank, and a light detector is set on the other side of the digestion tank opposite to the detection light source. A temperature control device is set inside the digestion tank for adjusting the temperature.

[0028] Specific as Figure 1 As shown, the water quality online monitoring instrument provided in the embodiment of this specification includes: a control system ( Figure 1 ), an extrusion peristaltic pump 1, a multi-way valve 2, a reagent bottle 4, an ultraviolet lamp 7, a detection light source 8, a digestion tank 9, a light detector 10, a temperature control device 11, a waste liquid bottle 12 and a temporary storage chamber 13.

[0029] like Figure 2As shown, the extrusion block of the extrusion peristaltic pump 1 performs linear reciprocating motion driven by the cam to press the hose. When the cam rotates one circle, the extrusion block completes one extrusion motion on the hose, forming a periodic operation. Compared with the rotary peristaltic pump, the fluid transmission of the extrusion peristaltic pump does not have pulsation and has high transmission accuracy.

[0030] Figure 3 This is a schematic diagram of the internal structure of an extrusion peristaltic pump, which includes: a main body, a limit plate, a pressing unit arranged in the main body, and a transmission component that drives the pressing unit to move. The limit plate provides an upper support surface for the hose. The limit plate and the main body are detachably fixedly connected to prevent the hose from moving upward. The hose is installed between the limit plate and the pressing unit.

[0031] The main body is provided with a pressing block movable groove, wherein the pressing unit is arranged in the pressing block movable groove. The pressing unit includes a liquid inlet cut-off block 23, a working pressing block 24, and a liquid discharge cut-off block 25 which are sequentially arranged along the axial direction of the hose. The liquid inlet cut-off block 23 and the liquid discharge cut-off block 25 are both arranged at the end of the hose pressing block movable groove, and the liquid inlet cut-off block 23 is close to the liquid inlet direction of the hose, and the liquid discharge cut-off block 25 is close to the liquid discharge direction of the hose, and the working pressing block 24 is arranged between the liquid inlet cut-off block 23 and the liquid discharge cut-off block 25.

[0032] The transmission component is a camshaft 26 having multiple cam structures, and the camshaft 26 is rotatably arranged on the body. The camshaft 26 includes a main shaft, a liquid inlet cut-off cam, a squeeze cam, and a liquid discharge cut-off cam. The phase angles corresponding to the highest peaks of adjacent cams are different. It can be understood that the highest points of the cams are not in the same position, and there is a phase difference, so that the action sequences of the liquid inlet cut-off block 23, the working pressure block 24, and the liquid discharge cut-off block 25 are different.

[0033] By coordinating the phase angles of the cams, the working order of the pressing blocks of the extrusion peristaltic pump can be directly adjusted, thereby directly obtaining the linkage effect of the control units, simplifying the control process of the peristaltic pump and improving the control efficiency.

[0034] In this embodiment, the liquid inlet cut-off cam corresponds to the liquid inlet cut-off block 23, the extrusion cam corresponds to the working pressure block 24, and the liquid discharge cut-off cam corresponds to the liquid discharge cut-off block 25. The liquid inlet cut-off cam drives the liquid inlet cut-off block 23 to perform linear reciprocating motion, the liquid discharge cut-off cam drives the liquid discharge cut-off block 25 to perform linear reciprocating motion, and the extrusion cam drives the working pressure block 24 to perform linear reciprocating motion.

[0035] It should be noted that the camshaft 26 may also be a combined structure, that is, the liquid inlet cut-off cam, the extrusion cam and the liquid discharge cut-off cam may be independent structures, and may be fixed on the main shaft by any radial fixing method, and may be fixed by a locating pin.

[0036] In addition, the liquid inlet cut-off cam, the extrusion cam and the liquid discharge cut-off cam can be set as an integrated structure, in which case the requirements for processing or injection molding are relatively high.

[0037] By using only the pressing block at the end of the extrusion area as a cut-off block, the hose is only compressed and closed by the cut-off block area, avoiding the overall compression of the extrusion area, reducing the high pressure on the entire section of the hose extrusion area, reducing fatigue damage to the hose, and increasing the life of the hose.

[0038] In order to facilitate the liquid inlet cut-off block and the liquid discharge cut-off block to clamp the hose, the liquid inlet cut-off block and the liquid discharge cut-off block are designed as clamping blocks, that is, the top has a certain bevel angle, which reduces the extrusion area of ​​the cut-off block, increases the pressure of the clamping block on the hose, improves the pressure effect, and enables the cut-off block to quickly press and close the hose to achieve flow cut-off.

[0039] In addition, elastic material may be provided on the lower end surface of the limit plate (close to the end surface of the hose) at a position corresponding to the clamping block. In this way, the hose can be clamped even when the clamping block is worn.

[0040] In this embodiment, the pressing block is arranged above the camshaft, and the liquid inlet cut-off cam, the extrusion cam and the liquid discharge cut-off cam of the camshaft are all basic cam structures, including a push section, an elevation stop section, a return section and an initial section. During the rotation of the camshaft, the push section pushes the pressing block upward to squeeze the hose, and the elevation stop section keeps the pressing block at the extrusion height. When the cam moves to the return section, due to the gravity of the pressing block, the pressing block moves downward to relax the hose, and resets to the initial section along the return section to complete the hose reset. The extrusion and reset of the hose are completed by the periodic movement of the cam.

[0041] The phase angles of the liquid inlet cut-off cam and the liquid discharge cut-off cam are related. Within the circumferential range, the elevation stop sections of the liquid inlet cut-off cam and the liquid discharge cut-off cam are mutually combined, so that at any angle position of the camshaft, there is a pressure block to squeeze the hose to maintain the highest position, so that the hose remains in a closed and cut-off state.

[0042] The initial arc diameters of the liquid inlet cut-off cam, the extrusion cam and the liquid discharge cut-off cam are the same, so that the hose maintains the same elastic state in the reset position. The cams all start to squeeze from the elastic deformation of the hose (such as 80% of the height of the hose), that is, the pressure block has a certain squeezing force on the hose when it is in the initial position of the cam, so that the hose of the extrusion peristaltic pump always maintains a good elastic recovery state during operation.

[0043] The elevation stop section of the liquid inlet cut-off cam and the liquid discharge cut-off cam is the same. In the elevation stop section, the distance between the cut-off block and the limit plate is less than 2 times the wall thickness of the hose, so that the hose generates overpressure, thereby ensuring that the hose is tightly closed in the elevation stop section of the cut-off block to avoid liquid backflow in the pipeline. The diameter of the elevation stop section of the extrusion cam is smaller than the elevation stop section of the cut-off cam, and the distance between the working pressure block and the limit plate in the elevation stop section of the extrusion cam is greater than 2 times the wall thickness of the hose to avoid excessive extrusion of the hose, thereby improving the elasticity and recovery force of the hose at the working pressure block position, reducing fatigue damage in the working pressure block area, and improving the mobility and service life of the hose.

[0044] Based on the above principle, the working process of the extrusion peristaltic pump is as follows:

[0045] Step 1: The camshaft rotates, the liquid inlet cut-off cam starts to move from the push stroke section, and the liquid inlet cut-off block moves upward to squeeze the hose. At this time, the liquid discharge cut-off cam is located in the elevation stop section, and the liquid discharge cut-off block keeps the hose closed. When the liquid inlet cut-off cam rotates to the elevation stop section, the liquid inlet cut-off block closes the hose, and the liquid inlet cut-off block keeps the liquid from flowing.

[0046] Step 2: Then, the drain cut-off cam enters the return section, and the opening of the hose in the liquid outlet direction gradually opens until the drain cut-off block resets to the initial section, completing the complete opening of the drain port.

[0047] Step 3: The extrusion cam rotates to the push section. At the same time or later, the drainage cut-off cam enters the push section. The working pressure block and the drainage cut-off block start to squeeze the hose at the same time, so that the liquid in the hose is discharged from the hose outlet direction, and the drainage cut-off block gradually closes the hose until the drainage cut-off block moves to the elevation stop section, completing the complete closure of the drainage port and stopping the flow of liquid. In this process, the working pressure block needs to enter the elevation stop section before the drainage cut-off block to prevent the working pressure block from being unable to squeeze and discharge the liquid in this area.

[0048] Step 4: The liquid inlet cut-off cam and the extrusion cam enter the return section, the opening of the hose inlet direction gradually opens, and the hose section of the working pressure block quickly opens until the liquid inlet cut-off block resets to the initial section, completing the complete opening of the liquid inlet. Due to the reset effect of the hose, the liquid is sucked into the inner cavity by the hose to complete the liquid accumulation.

[0049] Step 5: Return to step 1.

[0050] By following the above steps and circulating continuously, the liquid can be moved from the inlet direction to the outlet direction in the hose, thus realizing the pumping function of the extrusion peristaltic pump.

[0051] Therefore, the extrusion type peristaltic pump 1 can be quantitatively sampled, and can also provide power for the circulation of liquid in different directions through the forward and reverse rotation of the motor. The extrusion type peristaltic pump 1 is connected to the temporary storage chamber 13, and the temporary storage chamber 13 is used to temporarily store liquid. The different valve path outlets of the multi-way valve 2 are connected to the reagent bottle through pipelines, and the multi-way valve 2 is controlled by the control system. The temporary storage chamber 13 is connected to the multi-way valve 2 through pipelines, and the temporary storage chamber 13 and the multi-way valve 2 are connected to the same side of the extrusion type peristaltic pump 1, and the control system controls the multi-way valve 2 to selectively open and close the pipelines of different reagent bottles. In addition, a valve path 5 outlet of the multi-way valve 2 is connected to the digestion tank 9 of the digestion detection system.

[0052] The digestion detection system is a closed device, including a digestion tank 9, with upper and lower end covers 6 at both ends of the digestion tank 9, which are used to seal and open the digestion tank. At least two ultraviolet lamps 7 are provided outside the digestion tank 9, a detection light source 8 is provided on one side of the digestion tank 9, and a light detector 10 is provided on the other side of the digestion tank 9 opposite to the detection light source 8, and a temperature control device 11 is provided inside the digestion tank 9. The digestion tank 9 is selectively opened and closed by a valve path of the multi-way valve 2. When the digestion detection system is finished, the control system opens the pipeline connection between the digestion tank 9 and the waste liquid bottle 12 to discharge the waste liquid.

[0053] The working principle of this scheme is as follows: the control system opens the corresponding pipeline of the multi-way valve 2 and starts the extrusion peristaltic pump 1. The extrusion peristaltic pump 1 generates negative pressure, and the water sample to be tested in the reagent bottle is sucked into the temporary storage chamber 13 through the multi-way valve 2. The liquid volume is controlled by the number of rotations of the extrusion peristaltic pump 1. After the quantitative measurement is completed, the control system controls the extrusion peristaltic pump 1 to generate positive pressure, and pushes the water sample to be tested into the digestion tank 9 in the digestion detection system through the multi-way valve 2. Then, the reagents in other reagent bottles are also taken into the digestion tank 9 by the same method, and then the temperature control device 11 starts to heat the digestion tank 9, and the ultraviolet lamp 7 irradiates the digestion tank 9 to accelerate the digestion reaction. After 3-10 minutes of digestion reaction, the temperature begins to drop, and then optical detection begins. The detection light source 8 irradiates the liquid to be tested, and the light detector 10 reads it. The substance to be tested in the liquid is measured according to the signal intensity of the light detector 10. After the detection is completed, the waste liquid is recovered. First, the corresponding valve path of the multi-way valve 2 is opened, and the control system starts the extrusion peristaltic pump 1. The extrusion peristaltic pump 1 generates negative pressure to absorb the waste liquid back into the temporary storage chamber 13. Then, the multi-way valve 2 is rotated to the passage of the waste liquid bottle 12, and the extrusion peristaltic pump 1 is started to generate positive pressure to push the liquid in the temporary storage chamber 13 into the waste liquid bottle 12.

[0054] It should be noted that before testing the actual water sample, the standard solution should be used instead of the water sample for measurement according to the above process to calculate the correction coefficient. All the above measurement processes are automatically controlled by the control system. At the same time, the control system provides a human-computer dialogue window to realize the system configuration of the water quality online monitor and the parameter configuration during the measurement process through the keyboard, mouse or touch screen, so as to realize the fully automatic and reliable operation of the water quality online monitor without supervision.

[0055] In order to further improve the liquid volume accuracy of the extrusion peristaltic pump, the control system of the extrusion peristaltic pump can also be set as a servo system, and the positioning speed is controlled in a closed loop to make the number of rotations of the extrusion peristaltic pump more accurate.

[0056] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a device including a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such a device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the device including the element.

[0057] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A water quality online monitoring instrument, characterized in that: include: An extrusion type peristaltic pump, a reagent bottle and a digestion detection system, wherein the extrusion type peristaltic pump is used for quantitatively sampling the liquid in the reagent bottle, the extrusion type peristaltic pump is connected to the digestion detection system through a pipeline, and the extrusion type peristaltic pump uses an extrusion block to press the pump tube.

2. The monitoring device according to claim 1, characterized in that: The monitor further comprises: a multi-channel sampling system, and the multi-channel sampling system is respectively connected to the extrusion peristaltic pump and the digestion detection system.

3. The monitoring device according to claim 2, characterized in that: The digestion detection system comprises: a digestion tank, an ultraviolet lamp, a detection light source and a light detector. End covers are arranged at the upper and lower ends of the digestion tank. The detection light source and the light detector are arranged opposite to each other outside the digestion tank. The ultraviolet lamp is arranged outside the digestion tank.

4. The monitoring device according to claim 3, characterized in that: The digestion detection system further includes: a temperature control device, which is arranged inside the digestion tank.

5. The monitoring device according to claim 3, characterized in that: There are multiple reagent bottles, which can be used to store water samples and reagents. The multi-channel sampling system includes: a multi-way valve, which is used to connect the extrusion peristaltic pump and the multiple reagent bottles, and one channel of the multi-way valve is connected to the digestion tank.

6. The monitoring device according to claim 5, characterized in that: The monitor further comprises: a temporary storage chamber, wherein the temporary storage chamber is used to connect the extrusion peristaltic pump and the multi-way valve.

7. The monitoring device according to claim 5, characterized in that: The monitor also includes: a waste liquid bottle, which is connected to the digestion tank through a pipeline.

8. The monitoring device according to claim 7, characterized in that: The waste liquid bottle is connected to a channel of the multi-way valve.

9. The monitoring device according to claim 2, characterized in that: The monitor further comprises: a control system, wherein the control system is used to control the extrusion peristaltic pump, the multi-channel sampling system and the digestion detection system.

10. The monitoring device according to claim 1, characterized in that: The control system of the extrusion peristaltic pump is a servo system.

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