A pretreatment device for optical detection of trihalomethane precursors in drinking water

Abstract

The present application relates to the field of optical detection device, concretely is a kind of drinking water trihalomethane precursor optical detection pretreatment device, including support frame, the inside fixed mounting of support frame is guided cylinder, the lower end of guided cylinder is detachably installed with collection cylinder, one side of support frame is fixedly installed with reflux pipe, the other side of support frame is fixedly installed with support plate, the upper end of support plate is fixedly installed with pumping cylinder, the outer surface of guided cylinder is fixedly installed with support ring, the support ring is used to install liquid extraction device, the present application utilizes water pump to drive water sample to circulate between guided cylinder and collection cylinder continuously, and cooperates with guide vane to enhance the rotational flow state in guided cylinder, so that the water sample to be detected is always in circulating mixing state, thereby reducing the concentration difference caused by sedimentation or local aggregation of each component in sample, improving the uniformity and representativeness of sample, which is beneficial to improve the accuracy of subsequent trihalomethane precursor optical detection result.

Description

Technical Field

[0001] This invention relates to the field of optical detection devices, specifically to an optical detection pretreatment device for trihalomethane precursors in drinking water. Background Technology

[0002] Trihalomethanes (THMs) are a class of disinfection byproducts generated during the disinfection of drinking water by the reaction of natural organic matter with disinfectants. Their precursors mainly include humic acid, fulvic acid, and other dissolved organic matter. The content and composition of trihalomethane precursors directly affect the formation potential of trihalomethanes in drinking water. Therefore, the detection and analysis of trihalomethane precursors in drinking water is of great significance for ensuring drinking water safety and optimizing water treatment processes.

[0003] In the prior art, drinking water samples are mostly collected by direct extraction or sampling after settling. However, since water samples often contain suspended particles, colloidal substances, and natural organic matter, these components are prone to concentration differences due to sedimentation, aggregation, or uneven distribution under static or normal flow conditions. This makes it difficult for the collected samples to accurately reflect the overall composition of the water sample, thus affecting the accuracy of subsequent optical detection results. Therefore, this application proposes a pretreatment device for optical detection of trihalomethane precursors in drinking water. Summary of the Invention

[0004] The purpose of this invention is to provide an optical detection and pretreatment device for trihalomethane precursors in drinking water, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a pretreatment device for optical detection of trihalomethane precursors in drinking water, comprising a support frame, a guide cylinder fixedly installed inside the support frame, a collection cylinder detachably installed at the lower end of the guide cylinder, a reflux pipe fixedly installed on one side of the support frame, the lower end of the reflux pipe communicating with the collection cylinder, the upper end of the reflux pipe extending into the interior of the guide cylinder, a water pump fixedly installed on the surface of the reflux pipe, the water pump continuously pumping the water sample to be tested from inside the collection cylinder to the upper part of the guide cylinder during operation, an output box fixedly installed inside the guide cylinder, the output box being fixedly connected to the output end of the reflux pipe, a support plate fixedly installed on the other side of the support frame, multiple sample bottles detachably installed on the support plate, a suction cylinder fixedly installed at the upper end of the support plate, and a support ring fixedly installed on the outer surface of the guide cylinder, the support ring being used to install a liquid extraction device for extracting water samples from the swirling area inside the guide cylinder, since the water sample inside the guide cylinder is always in a state of circulating mixing.

[0006] As a further embodiment of the present invention, the liquid extraction device includes a support sleeve, the support sleeve being fixedly installed on the surface of a support ring, a transmission tube being slidably installed inside the support ring, a central tube being fixedly installed on the surface of the support sleeve, and the central tube passing through the interior of the transmission tube, a sealing block being fixedly installed on the inner wall of the guide cylinder, the sealing block being sleeved on the outer side of the transmission tube, and an extraction hole being opened on the surface of the transmission tube.

[0007] As a further embodiment of the present invention, a through pipe is fixedly installed at the inner end of the transmission tube. The through pipe passes through the interior of the central tube. The end of the through pipe near the support sleeve is a closed structure, and the end away from the support sleeve is connected to the area where the extraction hole is located. A transmission hole is opened on the surface of the through pipe.

[0008] As a further embodiment of the present invention, a sealing ball is movably installed inside the support sleeve, and the sealing ball is connected to the central tube by a return spring.

[0009] As a further embodiment of the present invention, a transmission ring is rotatably mounted on the bottom end of the support ring, a toothed ring is fixedly mounted on the inner side of the transmission ring, and a guide ring is fixedly mounted on the outer surface of the transmission tube. The guide ring is located between two triangular blocks. When the transmission ring rotates, the two triangular blocks contact the guide ring in sequence and form a guiding effect. Since the triangular blocks have inclined guiding surfaces, the circumferential rotation of the transmission ring can be converted into the axial movement of the transmission tube.

[0010] As a further embodiment of the present invention, a connecting plate is detachably installed inside the support plate, and multiple sample bottles are detachably installed on the connecting plate. Through the setting of the connecting plate, an output tube is fixedly connected to the bottom end of the pumping cylinder. The output tube is provided with multiple output ends, and the multiple output ends are respectively connected to the corresponding sample bottles. A connector is fixedly connected to the upper end of the pumping cylinder. The connector is sleeved on the outside of the output port of the support sleeve, and an unlocking rod is fixedly installed inside the connector.

[0011] As a further embodiment of the present invention, a sealing ring is fixedly installed inside the connector, a central rod is slidably installed inside the sealing ring, a sealing plate is fixedly installed at one end of the central rod near the support sleeve, and a suction rod is slidably installed inside the suction cylinder. By setting the sealing ring, the central rod, the sealing plate, and the suction rod, the suction cylinder can form a stable suction action, realize continuous extraction of water samples, reduce sample backflow, and improve sample collection efficiency and the reliability of detection results.

[0012] As a further embodiment of the present invention, a movable plug is fixedly installed at the lower end of the pull rod. The movable plug can slide up and down along the inner wall of the suction cylinder. A toggle block is fixedly installed at the lower end of the movable plug. By setting the pull rod, the movable plug and the toggle block, the movable plug reciprocates inside the suction cylinder to form a suction effect, thereby achieving stable sample extraction. In addition, the toggle block is used in conjunction with related structures to open or close the flow channel, thereby improving sample collection efficiency.

[0013] As a further embodiment of the present invention, the sealing plate and the unlocking rod are connected by an auxiliary spring. Under the action of the auxiliary spring, the sealing plate always tends to move toward the support sleeve. The side wall of the pull cylinder is provided with a drain outlet, and a guide block is rotatably installed at the drain outlet. The actuating block cooperates with the guide block.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. This invention sets up a guide cylinder, a collection cylinder, a return pipe, and a water pump. The water pump continuously drives the water sample to circulate between the guide cylinder and the collection cylinder. In addition, the guide vanes enhance the swirling state inside the guide cylinder, so that the water sample to be tested is always in a circulating and mixed state. This reduces the concentration difference of the components in the sample caused by sedimentation or local aggregation, improves the uniformity and representativeness of the sample, and helps to improve the accuracy of subsequent optical detection results of trihalomethane precursors.

[0016] 2. This invention, by setting up a transmission tube, extraction hole, sealing block, guide groove and drive motor, realizes the axial movement and synchronous rotation of the transmission tube under the drive of the drive motor, so that the extraction hole can open at a designated position and sample in a predetermined direction. On the one hand, it can reduce the situation where large particle impurities directly enter the extraction channel during the swirling process, and on the other hand, it can improve the collection effect of water samples in the target detection area, thereby reducing the interference of impurities on the detection results.

[0017] 3. This invention achieves simultaneous pretreatment and sampling of water samples during the sample circulation process by combining a vortex pretreatment structure with a directional sampling structure. Compared with existing methods that require filtration, transfer, and separate sampling, this reduces sample processing steps and lowers the risk of sample loss, thereby improving the efficiency of sample pretreatment and the stability of detection results for trihalomethane precursors in drinking water. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0019] Figure 2 A schematic diagram showing the disassembled structure of the guide tube and the collecting tube;

[0020] Figure 3 This is a schematic diagram of the internal structure of the guide cylinder;

[0021] Figure 4 This is a schematic diagram of the internal structure of the support ring;

[0022] Figure 5 This is a schematic diagram of the internal structure of the support sleeve;

[0023] Figure 6 This is a schematic diagram of the internal structure of the transmission tube;

[0024] Figure 7 This is a schematic diagram of the triangular block and guide ring structure;

[0025] Figure 8 This is a schematic diagram of the structure of the pull cylinder and the connecting plate;

[0026] Figure 9 This is a schematic diagram of the internal structure of the pull-out cylinder;

[0027] Figure 10 This is a schematic diagram of the internal structure of the connector;

[0028] Figure 11 This is a schematic diagram of the structure of the movable plug and the guide block;

[0029] Figure 12 This is a simplified diagram showing the distribution of trihalomethane precursors in drinking water.

[0030] In the diagram: 1. Support frame; 2. Return pipe; 3. Water pump; 4. Guide cylinder; 5. Collection cylinder;

[0031] 101. Support ring; 102. Output box; 103. Support sleeve; 104. Guide vane; 105. Transmission ring; 106. Gear ring; 107. Drive motor; 108. Output gear; 109. Transmission pipe; 110. Sealing block; 111. Guide groove;

[0032] 201. Pull cylinder; 202. Support plate; 203. Sample bottle; 204. Connecting plate; 205. Connector; 206. Pull rod; 207. Drain outlet; 208. Output pipe; 209. Traction spring; 210. Actuating block; 211. Movable plug; 212. Passive plug; 213. Guide block;

[0033] 301. Sealing ball; 302. Limiting ring; 303. Extraction hole; 304. Through pipe; 305. Central tube; 306. Return spring; 307. Guide ring; 308. Triangular block; 309. Transmission hole;

[0034] 401. Sealing plate; 402. Center rod; 403. Auxiliary spring; 404. Unlocking rod; 405. Sealing ring. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Example 1: Please refer to Figures 1-3 An optical detection and pretreatment device for trihalomethane precursors in drinking water includes a support frame 1, a guide cylinder 4 fixedly installed inside the support frame 1, and a collection cylinder 5 detachably installed at the lower end of the guide cylinder 4. The guide cylinder 4 is arranged in a conical structure with a larger upper part and a smaller lower part, which is used to guide the liquid to form a downward converging flow state.

[0037] A return pipe 2 is fixedly installed on one side of the support frame 1. The lower end of the return pipe 2 is connected to the collection cylinder 5, and the upper end of the return pipe 2 extends into the interior of the guide cylinder 4. A water pump 3 is fixedly installed on the surface of the return pipe 2. When the water pump 3 is running, it can continuously pump the water sample to be tested inside the collection cylinder 5 to the upper part of the guide cylinder 4 to form a circulating flow path.

[0038] An output box 102 is fixedly installed inside the guide cylinder 4. The output box 102 is fixedly connected to the output end of the return pipe 2. The output box 102 is used to guide and distribute the water flow output from the return pipe 2. Specifically, the outlet of the output box 102 is opened on its side wall, and the outlet direction is set along the tangential direction of the inner wall of the guide cylinder 4, so that the water flow entering the guide cylinder 4 flows in a rotating state along the inner wall of the guide cylinder 4.

[0039] During the continuous operation of the water pump 3, the water sample in the collection cylinder 5 is transported to the output box 102 through the return pipe 2 and discharged from the outlet at the side wall of the output box 102. The discharged water flows downward spirally along the inner wall of the guide cylinder 4 and finally flows back into the collection cylinder 5, thereby forming a stable circulating vortex flow field between the guide cylinder 4 and the collection cylinder 5. Through this circulating flow mode, the water sample to be tested can be kept in a mixed state, reducing local concentration differences in the sample and improving sampling uniformity.

[0040] Furthermore, a guide vane 104 is rotatably installed at the lower end of the guide cylinder 4. The guide vane 104 rotates under the impact of the water flow and guides the downward flow of water, so that the water sample forms a more stable swirling state inside the guide cylinder 4. Through the cooperation of the guide vane 104 and the conical structure of the guide cylinder 4, the circulation and mixing effect of the water sample can be further improved, and the deposition of suspended particles and organic components in local areas can be reduced, which is conducive to the uniform pretreatment of the samples for subsequent trihalomethane precursor detection.

[0041] A support plate 202 is fixedly installed on the other side of the support frame 1. Multiple sample bottles 203 are detachably installed on the support plate 202. A suction cylinder 201 is fixedly installed on the upper end of the support plate 202. A support ring 101 is fixedly installed on the outer surface of the guide cylinder 4. The support ring 101 is used to install the liquid extraction device.

[0042] The liquid extraction device is configured in conjunction with the extraction cylinder 201 to extract water samples from the swirling area inside the guide cylinder 4. Since the water sample inside the guide cylinder 4 is always in a state of circulation and mixing, the liquid extraction device can obtain representative test samples and transport the extracted samples to the sample bottle 203 for collection. By circulating and mixing before sampling, the consistency and uniformity of the samples can be effectively improved, and the impact of impurity sedimentation or uneven component distribution on the subsequent optical detection results can be reduced.

[0043] like Figures 3-6 As shown, the liquid extraction device includes a support sleeve 103, which is fixedly installed on the surface of a support ring 101. A transmission tube 109 is slidably installed inside the support ring 101. A central tube 305 is fixedly installed on the surface of the support sleeve 103 and passes through the inside of the transmission tube 109.

[0044] A sealing block 110 (not shown in the figure) is fixedly installed on the inner wall of the guide cylinder 4. The sealing block 110 is sleeved on the outside of the transmission tube 109. The surface of the transmission tube 109 is provided with an extraction hole 303. In the initial state, the extraction hole 303 is located in the coverage area of ​​the sealing block 110, thereby isolating it from the liquid inside the guide cylinder 4. When the transmission tube 109 moves away from the support sleeve 103, the extraction hole 303 gradually leaves the blocking range of the sealing block 110 and is exposed inside the guide cylinder 4 to realize liquid extraction.

[0045] Specifically, a guide protrusion is fixedly installed on the inner side of the sealing block 110, and a guide groove 111 is opened on the outer surface of the transmission tube 109. The guide groove 111 is spirally distributed, and the guide protrusion is embedded in the inside of the guide groove 111. When the transmission tube 109 moves axially, under the cooperation of the guide protrusion and the guide groove 111, the transmission tube 109 rotates circumferentially, thereby changing the opening direction of the extraction hole 303.

[0046] At this time, the extraction hole 303 is rotated to face downwards. Since the water sample inside the guide tube 4 flows downwards in a spiral shape along the inner wall of the guide tube 4, the downward orientation of the extraction hole 303 can prevent the sedimented particles or larger impurities above from falling directly into the extraction hole 303. At the same time, it reduces the frontal impact of the high-speed swirling water flow on the extraction hole 303, making the sample entering the extraction hole 303 more stable, which is beneficial to improving the representativeness of the sample in subsequent optical detection.

[0047] A through pipe 304 is fixedly installed at the inner end of the transmission pipe 109. The through pipe 304 passes through the interior of the central pipe 305. The end of the through pipe 304 near the support sleeve 103 is a closed structure, and the end away from the support sleeve 103 is connected to the area where the extraction hole 303 is located. A transmission hole 309 is opened on the surface of the through pipe 304.

[0048] In the initial state, the through pipe 304 is located inside the central pipe 305, and the transmission hole 309 is within the coverage area of ​​the central pipe 305. The central pipe 305 forms a sealing effect on the transmission hole 309, preventing external liquid from entering the interior of the central pipe 305.

[0049] When the transmission tube 109 moves away from the support sleeve 103, the through tube 304 moves synchronously. The transmission hole 309 gradually leaves the sealing range of the central tube 305 and communicates with the internal space of the central tube 305. At this time, the water sample that enters the guide tube 4 through the extraction hole 303 first flows into the through tube 304, and then flows out through the transmission hole 309 and enters the central tube 305, thus forming a sample transport path of "extraction hole 303 - through tube 304 - transmission hole 309 - central tube 305".

[0050] The liquid extraction device only connects to the inside of the guide cylinder 4 after the transmission tube 109 moves to the designated position, thereby avoiding continuous contact between the device and the water sample when not sampling. At the same time, by utilizing the directional rotation of the extraction hole 303 and the selective conduction structure between the through tube 304 and the central tube 305, the detection sample can be obtained in the area where the swirling flow inside the guide cylinder 4 is relatively stable, reducing the impact of suspended impurities and local concentration fluctuations on the sampling results, and improving the consistency and reliability of sample pretreatment before optical detection of trihalomethane precursors.

[0051] Example 2: Please refer to Figures 4-6 An optical detection pretreatment device for trihalomethane precursors in drinking water, based on Embodiment 1, wherein a sealing ball 301 is movably installed inside the support sleeve 103, and the sealing ball 301 is connected to the central tube 305 by a return spring 306. Specifically, an auxiliary rod is fixedly installed on the surface of the sealing ball 301, and the auxiliary rod passes through the interior of the central tube 305 and can slide along the axial direction of the central tube 305 to guide the movement of the sealing ball 301.

[0052] A limiting ring 302 is fixedly installed inside the central tube 305. The limiting ring 302 is located between the sealing ball 301 and the central tube 305. Multiple flow guiding grooves are formed on the surface of the limiting ring 302. When the sealing ball 301 moves toward the central tube 305, the flow guiding grooves are used to form a liquid flow gap, thereby avoiding direct contact between the sealing ball 301 and the end of the central tube 305, which would cause complete blockage of the flow channel.

[0053] The support sleeve 103 is equipped with an output port at the end away from the transmission tube 109. In the initial state, the return spring 306 is in a naturally extended state and pushes the sealing ball 301 to fit against the output port, so that the support sleeve 103 is in a closed state, thereby preventing external air from entering the sampling passage and preventing the sample from leaking when not sampling.

[0054] When the water sample inside the guide tube 4 enters the through pipe 304 through the extraction hole 303 and flows into the central pipe 305 through the transmission hole 309, the flowing liquid generates a thrust on the sealing ball 301. When the thrust is greater than the elastic force of the return spring 306, the sealing ball 301 moves away from the output port along the axial direction of the central pipe 305, thus opening the output port.

[0055] Through the combined action of the sealing ball 301, the reset spring 306, and the limiting ring 302, the liquid extraction device automatically turns on only when the sample actually flows through, which can reduce the influence of the external environment on the sample and reduce the situation where the sample stays in the pipeline for a long time. This is beneficial to improving the accuracy and reliability of subsequent optical detection results of trihalomethane precursors.

[0056] like Figure 4 and Figure 7 As shown, a transmission ring 105 is rotatably mounted on the bottom end of the support ring 101, a gear ring 106 is fixedly mounted on the inner side of the transmission ring 105, a drive motor 107 is fixedly mounted inside the support frame 1, and an output gear 108 is fixedly mounted on the output end of the drive motor 107, and the output gear 108 meshes with the gear ring 106.

[0057] When the drive motor 107 starts, the output gear 108 drives the gear ring 106 to rotate, which in turn drives the transmission ring 105 to rotate around the support ring 101. Two triangular blocks 308 are fixedly installed on the inner side of the transmission ring 105. The two triangular blocks 308 are arranged at intervals along the circumference of the transmission ring 105 and are staggered with each other.

[0058] A guide ring 307 is fixedly installed on the outer surface of the transmission tube 109. The guide ring 307 is located between two triangular blocks 308. When the transmission ring 105 rotates, the two triangular blocks 308 contact the guide ring 307 in turn and form a guiding effect. Since the triangular blocks 308 have an inclined guiding surface, the circumferential rotation of the transmission ring 105 can be converted into the axial movement of the transmission tube 109.

[0059] As the transmission tube 109 moves away from the support sleeve 103, the extraction hole 303 gradually moves away from the blocking range of the sealing block 110. At the same time, the through tube 304 is displaced relative to the central tube 305, so that the transmission hole 309 is connected to the internal space of the central tube 305, thereby establishing a sample extraction passage. When the drive motor 107 rotates in the reverse direction, the transmission ring 105 drives the transmission tube 109 to reset, and the extraction hole 303 re-enters the covering area of ​​the sealing block 110. The transmission hole 309 is blocked by the central tube 305 again, and the sample extraction passage is cut off.

[0060] like Figure 2 , Figures 8-10 As shown, a connecting plate 204 is detachably installed inside the support plate 202. Multiple sample bottles 203 are detachably installed on the connecting plate 204. The connection plate 204 facilitates the centralized installation and disassembly of multiple sample bottles 203, thereby meeting the needs of different water sample classification and collection.

[0061] The bottom end of the pump tube 201 is fixedly connected to the output tube 208. The output tube 208 is provided with multiple output ends, which are connected to the corresponding sample bottles 203 respectively. Specifically, each output end is equipped with a valve. By controlling the opening state of different valves, the extracted samples can be introduced into the corresponding sample bottles 203 for collection.

[0062] A connector 205 is fixedly connected to the upper end of the pumping cylinder 201. The connector 205 is sleeved on the outside of the output port of the support sleeve 103. An unlocking rod 404 is fixedly installed inside the connector 205. When the connector 205 is connected to the support sleeve 103, the unlocking rod 404 can contact the sealing ball 301 and push the sealing ball 301 to move inward against the elastic force of the return spring 306, so that the output port of the support sleeve 103 remains open so that the sample can continuously enter the pumping cylinder 201.

[0063] A sealing ring 405 is fixedly installed inside the connector 205. A central rod 402 is slidably installed inside the sealing ring 405. A sealing plate 401 is fixedly installed at one end of the central rod 402 near the support sleeve 103. A movable gap is left between the sealing plate 401 and the inner wall of the connector 205 to allow the water sample to flow continuously.

[0064] A pull rod 206 is slidably installed inside the pull cylinder 201. A movable plug 211 is fixedly installed at the lower end of the pull rod 206. The movable plug 211 can slide up and down along the inner wall of the pull cylinder 201. A toggle block 210 is fixedly installed at the lower end of the movable plug 211.

[0065] The sealing plate 401 and the unlocking rod 404 are connected by an auxiliary spring 403. Under the action of the auxiliary spring 403, the sealing plate 401 always tends to move towards the support sleeve 103. When the movable plug 211 moves upward, a negative pressure is formed inside the pumping cylinder 201, and the sealing plate 401 can move away from the unlocking rod 404, allowing liquid to enter the pumping cylinder 201 through the connector 205. When the pressure inside the pumping cylinder 201 is restored, the auxiliary spring 403 pushes the sealing plate 401 to reset, thereby reducing liquid backflow and improving the stability of the sampling process.

[0066] The side wall of the pump cylinder 201 is provided with a drain outlet 207. A guide block 213 is rotatably installed at the drain outlet 207. Specifically, a semi-circular support block is provided at the upper end of the guide block 213. In the initial state, the semi-circular support block corresponds to the drain outlet 207, thereby blocking the drain outlet 207.

[0067] The actuating block 210 cooperates with the guide block 213. When the pull rod 206 moves, the actuating block 210 contacts the guide block 213 and drives the guide block 213 to rotate, so that the semi-circular support block gradually moves away from the position of the drain outlet 207, thereby connecting the drain outlet 207 with the internal cavity of the extraction cylinder 201, so as to use water flow to flush away the diluted lower extraction cylinder 201 before extracting the sample.

[0068] A passive plug 212 is movably installed inside the guide block 213. The passive plug 212 is connected to the movable plug 211 by a traction spring 209. A limit structure is fixedly installed inside the guide block 213. The limit structure is located above the passive plug 212 to limit the upward movement of the passive plug 212, so that the passive plug 212 can only move downward. At this time, the guide block 213 connects the pumping cylinder 201 with the output pipe 208.

[0069] Furthermore, the upper end of the passive plug 212 is designed with an arc surface structure. When the active plug 211 moves upward again, even if the passive plug 212 is in a position away from the guide block 213, under the pulling action of the traction spring 209, its arc surface can contact the inner wall of the guide block 213 and form a guiding effect, thereby guiding the passive plug 212 to re-enter the interior of the guide block 213 and restore the sealing state, so as to ensure that the subsequent sampling cycle can be carried out stably.

[0070] like Figure 1 The support frame 1 is equipped with a control terminal, which can accurately control the rotation angle of the output end of the drive motor 107, thereby controlling the position of the extraction hole 303.

[0071] The working principle of this invention is:

[0072] When in use, the water pump 3 is started, and the tap water sample inside the collection cylinder 5 is continuously transported to the guide cylinder 4 through the return pipe 2. After being guided by the output box 102, the water flows downward in a spiral shape along the inner wall of the guide cylinder 4, and forms a circulating flow path between the guide cylinder 4 and the collection cylinder 5. The guide vanes 104 rotate under the action of the water flow, further enhancing the swirling state inside the guide cylinder 4, so that the sample is continuously in a mixed and circulating flow state, thereby reducing the uneven distribution of the components in the sample.

[0073] After the connector 205 is connected to the support sleeve 103, the unlocking rod 404 contacts the sealing ball 301 and pushes the sealing ball 301 to move inward against the elastic force of the reset spring 306, so that the output port of the support sleeve 103 remains open, and a flow channel is established for subsequent sample extraction.

[0074] Subsequently, the drive motor 107 starts, drives the output gear 108 to rotate a certain angle and then stops. The output gear 108 drives the gear ring 106 and the transmission ring 105 to rotate synchronously. Under the cooperation of the two triangular blocks 308 and the guide ring 307, the circumferential rotation of the transmission ring 105 is converted into the axial movement of the transmission tube 109.

[0075] When the transmission tube 109 moves away from the support sleeve 103, the extraction hole 303 gradually moves away from the shielding range of the sealing block 110 and is exposed inside the guide tube 4. At the same time, the through tube 304 is displaced relative to the central tube 305, so that the transmission hole 309 is connected to the internal space of the central tube 305, thereby establishing a sample extraction passage.

[0076] like Figure 12 As shown, after a stable vortex is formed inside the guide cylinder 4, according to the principle of fluid centrifugal separation, larger particles, silt, and suspended solids with higher density in the water sample tend to accumulate in the outer ring area (region a) near the inner wall of the guide cylinder 4 under the action of strong centrifugal force, and flow down the conical inner wall to the collection cylinder 5. Near the geometric center axis of the guide cylinder 4 (region c), due to the conservation of momentum and the low-pressure convergence effect, the suspended solids in the fluid are completely stripped off, thus forming a relatively clear low-turbidity clear water core area, while region b, located between the two, forms a transition area with a relatively high concentration of organic matter.

[0077] Trihalomethane precursors in drinking water mainly include natural organic compounds such as humic acid and fulvic acid. Some of their components may adhere to the surface of microbubbles or exist in a light suspended state. Under the action of swirling flow, they are more likely to be distributed near region b. By precisely controlling the axial extension of the transmission tube 109 through the drive motor 107, the extraction hole 303 is extended and positioned in the clear water core area (between regions c and b) near the central axis. At the same time, the guide groove 111 guides the extraction hole 303 to rotate to the back water side opposite to the direction of water flow. By utilizing the inertia of particle motion and the back water surface wake effect, selective absorption of clear liquid is achieved, which fundamentally prevents impurities in the outer ring region a from entering the sampling pipeline, significantly extends the maintenance cycle of subsequent optical detection elements, and ensures the accuracy of trihalomethane precursor detection in drinking water.

[0078] During sampling, the operator moves the lever 206 up and down repeatedly. When the lever 206 moves upward, the movable plug 211 drives the passive plug 212 to move upward through the traction spring 209, so that the passive plug 212 fits against the inside of the guide block 213 and seals the flow channel inside the guide block 213. At this time, the movable plug 211 continues to move upward, so that a negative pressure is formed inside the pumping cylinder 201. Under the action of the sealing plate 401 opening, the water sample inside the guide cylinder 4 enters the pumping cylinder 201 in sequence through the extraction hole 303, the through pipe 304, the central pipe 305, the support sleeve 103 and the connector 205.

[0079] When the lever 206 moves downward, the movable plug 211 moves downward synchronously, while the passive plug 212 moves relatively backward under the action of liquid pressure, thereby disengaging from the inside of the guide block 213, opening the flow channel inside the guide block 213. At the same time, the agitator 210 pushes the guide block 213 to rotate, making the drain port 207 connected to the inside of the pumping cylinder 201. At this time, the sample inside the pumping cylinder 201 enters the output pipe 208 through the drain port 207 under the squeezing action of the movable plug 211, and flows into the selected sample bottle 203 through the corresponding valve to complete the collection.

[0080] Through the above process, the device can form a continuous swirling pretreatment environment inside the guide cylinder 4 and perform directional sampling of the target area under swirling conditions, thereby improving the uniformity, representativeness, and accuracy of the sample collection before optical detection of trihalomethane precursors in drinking water.

[0081] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A pretreatment device for optical detection of trihalomethane precursors in drinking water, comprising a support frame (1), characterized in that: A guide cylinder (4) is fixedly installed inside the support frame (1). A collection cylinder (5) is detachably installed at the lower end of the guide cylinder (4). A return pipe (2) is fixedly installed on one side of the support frame (1). The lower end of the return pipe (2) is connected to the collection cylinder (5). The upper end of the return pipe (2) extends into the interior of the guide cylinder (4). A water pump (3) is fixedly installed on the surface of the return pipe (2). When the water pump (3) is running, it can continuously pump the water sample to be tested from inside the collection cylinder (5) to the upper part of the guide cylinder (4). An output box (10) is fixedly installed inside the guide cylinder (4). 2) The output box (102) is fixedly connected to the output end of the return pipe (2). A support plate (202) is fixedly installed on the other side of the support frame (1). Multiple sample bottles (203) are detachably installed on the support plate (202). A suction cylinder (201) is fixedly installed on the upper end of the support plate (202). A support ring (101) is fixedly installed on the outer surface of the guide cylinder (4). The support ring (101) is used to install a liquid extraction device for extracting water samples from the swirling area inside the guide cylinder (4). Since the water sample inside the guide cylinder (4) is always in a state of circulating mixing.

2. The optical detection and pretreatment device for trihalomethane precursors in drinking water according to claim 1, characterized in that: The liquid extraction device includes a support sleeve (103), which is fixedly installed on the surface of a support ring (101). A transmission tube (109) is slidably installed inside the support ring (101). A central tube (305) is fixedly installed on the surface of the support sleeve (103) and passes through the inside of the transmission tube (109). A sealing block (110) is fixedly installed on the inner wall of the guide cylinder (4) and is sleeved on the outside of the transmission tube (109). An extraction hole (303) is opened on the surface of the transmission tube (109).

3. The optical detection and pretreatment device for trihalomethane precursors in drinking water according to claim 2, characterized in that: A through pipe (304) is fixedly installed at the inner end of the transmission pipe (109). The through pipe (304) passes through the interior of the central pipe (305). The end of the through pipe (304) near the support sleeve (103) is a closed structure, and the end away from the support sleeve (103) is connected to the area where the extraction hole (303) is located. A transmission hole (309) is opened on the surface of the through pipe (304).

4. The optical detection and pretreatment device for trihalomethane precursors in drinking water according to claim 3, characterized in that: A sealing ball (301) is movably installed inside the support sleeve (103), and the sealing ball (301) is connected to the central tube (305) by a return spring (306).

5. The optical detection and pretreatment device for trihalomethane precursors in drinking water according to claim 2, characterized in that: A transmission ring (105) is rotatably mounted on the bottom end of the support ring (101). A toothed ring (106) is fixedly mounted on the inner side of the transmission ring (105). A guide ring (307) is fixedly mounted on the outer surface of the transmission tube (109). The guide ring (307) is located between two triangular blocks (308). When the transmission ring (105) rotates, the two triangular blocks (308) contact the guide ring (307) in sequence and form a guiding effect. Since the triangular blocks (308) have an inclined guiding surface, the circumferential rotation of the transmission ring (105) can be converted into the axial movement of the transmission tube (109).

6. The optical detection and pretreatment device for trihalomethane precursors in drinking water according to claim 5, characterized in that: The support plate (202) is detachably installed with a connecting plate (204). Multiple sample bottles (203) are detachably installed on the connecting plate (204). Through the setting of the connecting plate (204), the bottom end of the pumping cylinder (201) is fixedly connected with an output tube (208). The output tube (208) is provided with multiple output ends, which are respectively connected to the corresponding sample bottles (203). The upper end of the pumping cylinder (201) is fixedly connected with a connector (205). The connector (205) is sleeved on the outside of the output port of the support sleeve (103). An unlocking rod (404) is fixedly installed inside the connector (205).

7. The optical detection and pretreatment device for trihalomethane precursors in drinking water according to claim 6, characterized in that: A sealing ring (405) is fixedly installed inside the connector (205), a center rod (402) is slidably installed inside the sealing ring (405), a sealing plate (401) is fixedly installed at one end of the center rod (402) near the support sleeve (103), and a pull rod (206) is slidably installed inside the pull cylinder (201).

8. The optical detection and pretreatment device for trihalomethane precursors in drinking water according to claim 7, characterized in that: The lower end of the pull rod (206) is fixedly equipped with a movable plug (211), which can slide up and down along the inner wall of the pull cylinder (201). The lower end of the movable plug (211) is fixedly equipped with a toggle block (210).

9. The optical detection and pretreatment device for trihalomethane precursors in drinking water according to claim 8, characterized in that: The sealing plate (401) and the unlocking rod (404) are connected by an auxiliary spring (403). Under the action of the auxiliary spring (403), the sealing plate (401) always tends to move toward the support sleeve (103). The side wall of the pull cylinder (201) is provided with a drain port (207). A guide block (213) is rotatably installed at the drain port (207). The actuating block (210) cooperates with the guide block (213).

Images