A rapid in-situ water quality detection device

Abstract

The present invention provides a rapid in-situ water quality detection device, comprising: an extraction device, the extraction device comprising a first cylinder, a pressure regulating assembly and a drive assembly. The first cylinder forms a relatively closed water storage area. The pressure regulating assembly is used to adjust the pressure of the water storage area. When the water storage area is in a negative pressure state, bubbles in the water sample in the water storage area precipitate and separate from the water sample, so that the water sample is divided into gas and liquid; when the water storage area is in a normal pressure state or a positive pressure state, the liquid flows out of the first cylinder. The drive assembly is used to provide power to the pressure regulating assembly. Thus, by performing pressure regulation on the water storage area and utilizing the dynamic relationship between gas solubility and pressure, the dissolved bubbles in the water sample are rapidly precipitated. The interference of bubbles on the optical sensor and electrochemical probe in the detection device is effectively eliminated, and abnormal light scattering or poor electrode contact is avoided, thereby significantly improving data accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of water quality detection, and in particular to a rapid in-situ water quality detection device. Background Art

[0002] Rapid in-situ water quality testing technology integrates multi-parameter sensors and real-time analysis modules to achieve on-site instant detection of key indicators such as dissolved oxygen, pH, and heavy metals in water bodies. It effectively breaks through the limitations of traditional laboratory testing cycles and large sampling interference, and plays an important role in drinking water safety monitoring, industrial water treatment, ecological and environmental early warning and other fields.

[0003] In practical applications, existing rapid in-situ water quality testing devices suffer from the problem of bubbles, which can cling to the sensor surface due to dissolved gases or turbulent flow in natural water bodies. This can interfere with the optical detection path and prevent effective contact between the electrochemical probe and the water. Furthermore, bubble accumulation within the flow channel can trigger cavitation in the microfluidic system, leading to distorted test data. This problem is particularly prominent in complex water bodies such as eutrophic lakes, high-pressure pipelines, or highly turbid rivers.

[0004] Existing improvement solutions mostly use external pre-treatment modules for bubble separation, but the use of external pre-treatment modules significantly increases the size and energy consumption of the equipment, making it difficult to adapt to the needs of long-term unmanned outdoor deployment or deployment in a small space. Summary of the Invention

[0005] Based on this, it is necessary to provide a rapid in-situ water quality detection device to address the problem that bubbles in the water sample of the current rapid in-situ water quality detection device interfere with the normal operation of the detection device and cause deviations in the detection data.

[0006] The above purpose is achieved through the following technical solutions:

[0007] A rapid in-situ water quality detection device comprises an extraction device, wherein the extraction device comprises a first cylinder, a pressure regulating assembly and a driving assembly.

[0008] The first cylinder forms a relatively closed water storage area, and the water storage area is used to accommodate water samples that need to be pretreated.

[0009] A pressure regulating component is used to adjust the pressure of the water storage area.

[0010] Among them, when the water storage area is in a negative pressure state, bubbles in the water sample in the water storage area precipitate and the water sample separates, so that the water sample is divided into gas and liquid; when the water storage area is in a normal pressure state or a positive pressure state, the liquid flows out of the first cylinder.

[0011] A driving assembly is used to provide power to the voltage regulating assembly.

[0012] In one embodiment, the pressure regulating assembly includes a first piston, and the first piston and the first cylinder surround the water storage area. When the first piston moves forward, the pressure in the water storage area decreases; when the first piston moves backward, the pressure in the water storage area increases.

[0013] In one embodiment, the first piston is provided with a first one-way valve. When the water storage area is in a positive pressure state, the first one-way valve allows gas to be discharged from the water storage area through the first one-way valve.

[0014] In one embodiment, the pressure regulating assembly includes a first piston rod, which is used to allow liquid to remain in the water storage area before exhausting the gas; after exhausting the gas, the first piston rod allows the liquid to be discharged from the water storage area.

[0015] In one embodiment, the driving assembly includes a rotating rod and a connecting structure, one end of the connecting structure is movably connected to the rotating rod, and the other end of the connecting structure is connected to the first piston. When the rotating rod rotates around its own axis, the first piston slides along the central axis of the first cylinder.

[0016] In one embodiment, a slideway is provided on the rotating rod, and the connecting structure includes a first connecting rod, and the first connecting rod drives the first piston to reciprocate along the central axis of the first cylinder along the slideway.

[0017] In one embodiment, the connection structure includes a second connecting rod, one end of the second connecting rod is connected to the first piston, and the other end of the second connecting rod is slidably connected to the first connecting rod.

[0018] The first connecting rod and the second connecting rod are connected via an elastic member, and the elastic force of the elastic member always makes the first connecting rod and the second connecting rod approach each other or have a tendency to approach each other.

[0019] The first connecting rod and the second connecting rod fit tightly together, so that the area where the elastic member is located is a sealing area. The sealing area prevents the first connecting rod and the second connecting rod from being relatively displaced when the first piston moves in the opposite direction.

[0020] In one embodiment, the first connecting rod is provided with an air pressure valve, and the air pressure valve restores the elastic member to an initial state.

[0021] In one embodiment, the driving assembly includes a baffle, which is used to prevent the water sample from continuing to enter the water storage area after the water sample in the water storage area reaches a preset value.

[0022] In one embodiment, the first cylinder includes a water inlet, which is used to allow the water sample to enter the water storage area. The water inlet is provided with a first filter, which is used to isolate impurities in the water sample.

[0023] The beneficial effects of the present invention are:

[0024] The present invention provides a rapid in-situ water quality detection device, comprising: an extraction device, the extraction device comprising a first cylinder, a pressure regulating assembly and a drive assembly. The first cylinder forms a relatively closed water storage area. The pressure regulating assembly is used to adjust the pressure of the water storage area. When the water storage area is in a negative pressure state, bubbles in the water sample in the water storage area precipitate and separate from the water sample, so that the water sample is divided into gas and liquid; when the water storage area is in a normal pressure state or a positive pressure state, the liquid flows out of the first cylinder. The drive assembly is used to provide power to the pressure regulating assembly. Thus, by performing pressure regulation on the water storage area and utilizing the dynamic relationship between gas solubility and pressure, the dissolved bubbles in the water sample are rapidly precipitated. The interference of bubbles on the optical sensor and electrochemical probe in the detection device is effectively eliminated, and abnormal light scattering or poor electrode contact is avoided, thereby significantly improving data accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic structural diagram of a rapid in-situ water quality detection device provided by one embodiment of the present invention;

[0026] Figure 2 for Figure 1 A top view of the medium-speed in-situ water quality testing device;

[0027] Figure 3 for Figure 2 AA cross-sectional view of the medium-speed in-situ water quality detection device;

[0028] Figure 4 for Figure 2 Cross-sectional view of the AA section of the medium-speed in-situ water quality testing device with the first piston in the second stage;

[0029] Figure 5 for Figure 1 Schematic diagram of the structure of the medium-speed in-situ water quality detection device, in which the main housing is hidden for easier observation;

[0030] Figure 6 for Figure 5 Enlarged view of point B of the medium-speed in-situ water quality detection device.

[0031] in:

[0032] 100. Main shell;

[0033] 200, first cylinder; 210, water inlet; 211, second one-way valve; 220, water outlet; 221, third one-way valve; 230, first sub-cylinder; 240, second sub-cylinder; 250, first filter;

[0034] 300, pressure regulating assembly; 310, first piston; 320, first one-way valve; 330, first piston rod; 331, second piston;

[0035] 400, driving assembly; 410, rotating rod; 411, slideway; 420, first connecting rod; 421, sliding block; 430, second connecting rod; 440, elastic member; 450, baffle;

[0036] 500. Detection device. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0038] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings). In the description of the present invention, it should be understood that terms such as "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the device or component being referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0039] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0040] Refer to the following Figure 1-Figure 5 The rapid in-situ water quality detection device provided by an embodiment of the present invention is described.

[0041] like Figures 1-4 As shown, the rapid in-situ water quality detection device includes a main housing 100. The main housing 100 surrounds a space relatively isolated from the external environment, and most other components are located in the space to protect the components inside the main housing 100.

[0042] The main housing 100 houses an extraction device and a detection device 500. The extraction device collects and pre-processes water samples to ensure the accuracy of subsequent testing. The extraction device then transfers the processed water samples to the detection device 500. Based on optical and electrochemical sensing principles, the detection device 500 accurately measures key water quality parameters in real time. Through multi-sensor collaborative analysis and signal processing, the detection device 500 directly outputs quantitative indicators, enabling rapid, non-interference, and dynamic monitoring and assessment of water quality on-site.

[0043] The extraction device includes a first cylinder 200 , a pressure regulating assembly 300 and a driving assembly 400 .

[0044] The first cylinder 200 forms a relatively closed water storage area, which is used to accommodate water samples that need to be pretreated.

[0045] The first cylinder 200 includes a water inlet 210 and a water outlet 220 . The water sample to be tested enters the first cylinder 200 from the water inlet 210 , and the pretreated liquid flows out of the first cylinder 200 from the water outlet 220 .

[0046] A second one-way valve 211 is provided at the water inlet 210 to prevent the water sample entering the first cylinder 200 from flowing out of the first cylinder 200 through the water inlet 210. A third one-way valve 221 is provided at the water outlet 220 to prevent the tested liquid from flowing back into the first cylinder 200 through the water outlet 220. When the water sample is being processed, the second one-way valve 211 and the third one-way valve 221 prevent the water sample from flowing out of the first cylinder 200.

[0047] It is understandable that the positions of the water inlet 210 and the water outlet 220 of the first cylinder 200 can be various. For example, the water inlet 210 is located on the side wall of the first cylinder 200 , and the water outlet 220 is located at the bottom of the first cylinder 200 .

[0048] However, the positional relationship between the water inlet 210 and the water outlet 220 should enable the water sample to first enter the first cylinder 200 from the water inlet 210 for pretreatment, and the pretreated liquid flows out from the water outlet 220 .

[0049] The pressure-regulating assembly 300 regulates the pressure in the water storage area. Bubbles, naturally present in water samples or generated by factors such as water flow disturbance, can interfere with the normal operation of existing rapid in-situ water quality testing devices. These bubbles can adhere to the surface of the test sensor, preventing full contact between the sensor and the water, leading to deviations in the test data and a failure to accurately reflect the water quality. Therefore, the pressure-regulating assembly 300 is installed within the first cylinder 200 to eliminate or mitigate the adverse effects of bubbles on testing.

[0050] When the water sample in the water storage area reaches the preset value, the pressure regulating component 300 starts to work, reducing the pressure in the water storage area to a negative pressure state. At this time, the gas dissolved in the water sample will precipitate to form bubbles due to the decrease in solubility. The bubbles may gather and rise to the liquid surface and enter the gas space above, thereby separating the water sample into gas and liquid.

[0051] After the bubbles are precipitated and the water sample is separated, the pressure regulating assembly 300 begins to increase the pressure of the water storage area and adjusts it to a normal pressure state or a positive pressure state. At this time, the third one-way valve 221 is opened to allow the liquid to flow out of the first cylinder 200 and enter the detection device 500.

[0052] It can be understood that the positional relationship between the pressure regulating assembly 300 and the first cylinder 200 can be diverse. For example, an independent pressure regulating control system can be used, and the pressure regulating control system can be suspended on the outer wall of the first cylinder 200. The two are connected by a pressure pipeline to adjust the pressure inside the first cylinder 200. It can also be an integrated pressure regulating control system, and the pressure regulating control system is arranged on the first cylinder 200 or in the first cylinder 200.

[0053] The driving assembly 400 serves as a power source for the extraction device, and provides power for the movement of other parts, including but not limited to the start-up of the pressure regulating assembly 300.

[0054] It is understood that the drive assembly 400 can be a common drive form, such as an electric motor, an internal combustion engine, etc. The power source in the drive assembly 400 can be centralized, transmitting power to other components through a transmission structure; or the power source can be decentralized, with multiple decentralized power sources driving each component separately.

[0055] It can be understood that in order to ensure the treatment effect of the water sample, after the water sample in the first cylinder 200 reaches the preset value, the second one-way valve 211 and the third one-way valve 221 are both in a closed state, so that the water sample does not flow out of the first cylinder 200; then the pressure regulating component 300 pre-treats the water sample so that the water sample is divided into gas and liquid; finally, the third one-way valve 221 is opened to allow the liquid to enter the detection device 500 for detection.

[0056] Thus, the rapid in-situ water quality testing device provided by the present embodiment regulates the pressure of the water storage area and utilizes the dynamic relationship between gas solubility and pressure to promote the rapid precipitation of dissolved bubbles in the water sample. This effectively eliminates the interference of bubbles on the optical sensor and electrochemical probe in the testing device 500, avoids abnormal light scattering or poor electrode contact, and significantly improves data accuracy.

[0057] In one embodiment, Figure 2-Figure 4 As shown, the pressure regulating assembly 300 includes a first piston 310 , and the first piston 310 and the first cylinder 200 surround a water storage area. The pressure in the water storage area is regulated by the movement of the first piston 310 in the first cylinder 200 .

[0058] The central axis of the first cylinder 200 is the first axis. The first piston 310 is located inside the first cylinder 200 and fits tightly against the inner wall of the first cylinder 200 . The first piston 310 can slide along the first axis in the first cylinder 200 .

[0059] Specifically, Figure 2 For example, the upward movement of the first piston 310 along the first axis is forward movement, and the downward movement of the first piston 310 along the first axis is reverse movement.

[0060] The first piston 310 has a first stage and a second stage in the first cylinder 200. In the first stage, the first piston 310 moves in the positive direction along the first axis, so that the pressure in the water storage area decreases and gradually changes from a normal pressure state to a negative pressure state; in the second stage, the first piston 310 moves in the reverse direction along the first axis in the first cylinder 200, so that the pressure in the water storage area increases and changes from a negative pressure state to a normal pressure state or a positive pressure state.

[0061] In the initial state, the first piston 310 is located at the lowermost end of the first cylinder 200 .

[0062] In the first stage, the first piston 310 begins forward movement, allowing the water sample to enter the water storage area. When the water sample reaches a preset pressure, it no longer enters the water storage area, and the pressure inside the first cylinder 200 is at normal pressure. The first piston 310 continues forward movement until it reaches its highest point, gradually reducing the pressure in the water storage area to a negative pressure state. Bubbles in the water sample precipitate and separate from the water sample, separating the water sample into gas and liquid.

[0063] Entering the second stage, the first piston 310 moves downward, so that the pressure in the water storage area reaches a normal pressure state or a positive pressure state, and the third one-way valve 221 is opened to allow liquid to flow out of the water storage area.

[0064] Thus, the pressure of the water storage area is adjusted by the first piston 310 .

[0065] Furthermore, a first one-way valve 320 is provided on the first piston 310 . When the water storage area is in a positive pressure state, the first one-way valve 320 allows gas to be discharged from the water storage area through the first one-way valve 320 .

[0066] Since, when the water storage area is under positive pressure, some of the unexpelled gas will redissolve in the liquid. To improve the efficiency of water sample pretreatment, a first one-way valve 320 is provided on the first piston 310, and a through hole is provided at the top of the first cylinder 200. In the second stage, the first piston 310 continues to move downward, so that when the water storage area is under positive pressure, the gas above the liquid is discharged from the first cylinder 200 through the first one-way valve 320. After the gas is discharged, the third one-way valve 221 is opened, and the liquid flows out of the first cylinder 200.

[0067] It is understandable that in order to remove more gas, the first piston 310 can be lowered a longer distance and then the third one-way valve 221 can be opened to allow the liquid to flow out. At this time, some liquid may flow out of the first one-way valve 320, but it will not cause large losses and will not affect the detection effect of the detection device 500.

[0068] In one embodiment, the pressure regulating assembly 300 includes a first piston rod 330 , which is used to discharge the liquid from the water storage area after the gas is discharged.

[0069] In order to drive the switching action of the third one-way valve 221 through the movement of the first piston 310, the first sub-cylinder 230 and the second sub-cylinder 240 are extended from the bottom of the first cylinder 200. The first cylinder 200, the first sub-cylinder 230, the second sub-cylinder 240 and the detection device 500 are fixedly connected in sequence, and the third one-way valve 221 is located at the connection between the second sub-cylinder 240 and the detection device 500. The diameter of the inner wall of the first sub-cylinder 230 is smaller than the diameter of the inner wall of the second sub-cylinder 240. A first piston rod 330 extends downward from the first piston 310 along the first axis direction, and a second piston 331 is provided at the lower end of the first piston rod 330, and the second piston 331 can be in close contact with the inner circumferential wall surface of the first sub-cylinder 230.

[0070] When the first piston 310 is in the first stage, the first piston 310 drives the second piston 331 to move in the first sub-cylinder 230 so that the amount of water sample in the water storage area can reach a preset value;

[0071] When the first piston 310 is in the second stage, before the gas is exhausted, the second piston 331 moves downward within the first sub-cylinder 230. After the gas is completely exhausted, the first piston 310 continues to move downward, driving the second piston 331 into the second sub-cylinder 240. At this time, liquid can enter the first sub-cylinder 230 and the second sub-cylinder 240.

[0072] Furthermore, as the first piston 310 moves downward, a positive pressure state is formed inside the first sub-cylinder 230 and the second sub-cylinder 240 , thereby opening the third one-way valve 221 to allow liquid to enter the detection device 500 .

[0073] Thus, the first piston rod 330 extends from under the first piston 310 , and the movement of the first piston 310 can further control the third one-way valve 221 .

[0074] It is understandable that, on the one hand, each time a water sample is pre-treated, a portion of the water sample will enter the first sub-cylinder 230 and the second sub-cylinder 240 before being processed. Before using the rapid in-situ water quality testing device, the extraction device can be used to pre-treat multiple groups of water samples as a preparatory work, so that pre-treated liquid is reserved in the first sub-cylinder 230 and the second sub-cylinder 240 before starting to use the rapid in-situ water quality testing device and recording the test data.

[0075] In one embodiment, Figure 2-Figure 6 As shown, the driving assembly 400 includes a rotating rod 410 and a connecting structure. The rotating rod 410 is used to drive the first piston 310 to move, and the connecting structure is used to connect the rotating rod 410 and the first piston 310.

[0076] Specifically, the rotating rod 410 is connected to one end of the connecting structure through threaded transmission, and the other end of the connecting structure is connected to the first piston 310 .

[0077] In the first stage, the rotating rod 410 rotates forward to drive the connecting structure upward, so that the first piston 310 moves upward; in the second stage, the rotating rod 410 rotates backward to drive the connecting structure downward, so that the first piston 310 moves downward.

[0078] Thus, the first piston 310 is driven to move by the rotation of the rotation rod 410 .

[0079] It is understandable that the rotating rod 410 can be driven to rotate by a rotating motor, or other driving structures can be used to drive the rotating rod 410. At the same time, the connecting structure can be fixedly connected to the first piston 310 or movably connected to the first piston 310.

[0080] Furthermore, a slideway 411 is provided on the rotating rod 410, and the connecting structure includes a first connecting rod 420. The first connecting rod 420 can achieve reciprocating motion of the first piston 310 along the slideway 411. To achieve reciprocating motion of the first piston 310 without changing the rotation direction of the rotating rod 410, the slideway 411 is provided on the rotating rod 410 with a continuously curved structure. The first connecting rod 420 is extended from the sliding block 421, so that the sliding block 421 is always located on the slideway 411. Thus, the reciprocating motion of the first piston 310 is achieved via the slideway 411 on the rotating rod 410.

[0081] In one embodiment, Figure 2-Figure 4 As shown, since the gas content in the water sample is uncertain, in order to adjust the movement displacement of the first piston 310 according to the gas content in the water sample, the connecting structure includes a second connecting rod 430, and the first connecting rod 420 and the second connecting rod 430 are slidably connected by an elastic member 440.

[0082] One end of the second connecting rod 430 is connected to the first piston 310, and the other end of the second connecting rod 430 is slidably connected to the first connecting rod 420. The first connecting rod 420 and the second connecting rod 430 are connected by an elastic member 440. The elastic force of the elastic member 440 always makes the first connecting rod 420 and the second connecting rod 430 approach each other or tend to approach each other.

[0083] The first connecting rod 420 and the second connecting rod 430 fit tightly together, so that the area where the elastic member 440 is located is a sealing area. The sealing area ensures that when the first piston 310 moves in the opposite direction, the distance between the first connecting rod 420 and the second connecting rod 430 is maintained at the distance between the first connecting rod 420 and the second connecting rod 430 at the end of the first stage, thereby making the movement displacement of the first piston 310 positively correlated with the gas content in the water sample.

[0084] The rotating rod 410 acts directly on the first connecting rod 420, so that the highest point of the first connecting rod 420 remains unchanged. Since the second connecting rod 430 and the first connecting rod 420 are connected by the elastic member 440, the second connecting rod 430 can also move with the first connecting rod 420, but the highest point of the second connecting rod 430 is related to the degree of stretching of the elastic member 440.

[0085] When the water sample contains more gas, the pressure difference between the pressure at the end of the first stage and the normal pressure state is smaller, so that the elastic member 440 is stretched less and the first piston 310 is at a higher position; in the second stage, the first piston 310 moves downward a larger displacement to completely discharge the gas.

[0086] When the water sample contains less gas, the pressure difference between the pressure at the end of the first stage and the normal pressure state is larger, so that the elastic member 440 is stretched to a greater extent and the first piston 310 is in a lower position; in the second stage, the first piston 310 moves downward with a smaller displacement, which will completely discharge the gas.

[0087] Furthermore, an air pressure valve is provided on the first connecting rod 420 so that the elastic member 440 can return to its initial state.

[0088] During the first stage, the first connecting rod 420 and the second connecting rod 430 move away from each other, so that a negative pressure state is formed in the sealing area. At the end of the second stage, the first piston 310 reaches the lowest point, and the first cylinder 200 restricts the first piston 310 from continuing to move downward. The first connecting rod 420 continues to move downward, so that the first connecting rod 420 and the second connecting rod 430 slide relative to each other. The air pressure valve on the first connecting rod 420 opens, so that the sealing area returns to a normal pressure state, and the elastic member 440 returns to its initial state.

[0089] Thus, the gas content of the water sample can be determined by the stretching degree of the elastic member 440 and the displacement of the first piston 310 , and the displacement of the first piston 310 can be adjusted according to the gas content in the water sample.

[0090] In one embodiment, Figure 2-Figure 6 As shown, the driving assembly 400 includes a baffle 450, which is used to prevent the water sample from continuing to enter the water storage area after the water sample in the water storage area reaches a preset value.

[0091] The baffle 450 and the first piston 310 move synchronously. In the first stage, the baffle 450 and the first piston 310 move upward synchronously. When the water sample reaches the preset value, the baffle 450 reaches the water inlet 210 position, preventing the water sample from continuing to enter the first cylinder 200; in the second stage, the baffle 450 follows the first piston 310 and moves downward synchronously to the initial position.

[0092] It is understood that other common restriction mechanisms can also be applied to the present invention, such as a restriction structure triggered by pressure.

[0093] In one embodiment, Figure 2-Figure 6 As shown, in order to prevent impurities from entering the first cylinder 200 , a first filter screen 250 is provided at the water inlet 210 of the first cylinder 200 .

[0094] Furthermore, the baffle 450 moves closely against the first filter screen 250 , so that impurities on the surface of the first filter screen 250 can be scraped off through the reciprocating movement of the baffle 450 .

[0095] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0096] The above-described embodiments merely illustrate several embodiments of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A rapid in-situ water quality detection device, characterized in that: include: The extraction device comprises a first cylinder, a pressure regulating assembly and a driving assembly; The water inlet is located on the side wall of the first cylinder, and the water outlet is located at the bottom of the first cylinder; The pressure regulating assembly includes a first piston, a first piston rod extending downward from the first piston, a second piston being provided at the lowermost end of the first piston rod, the first piston and the first cylinder surrounding a water storage area, the water storage area being used to accommodate water samples that need to be pretreated, and when the first piston moves forward, the pressure in the water storage area is reduced; when the first piston moves backward, the pressure in the water storage area is increased; the first piston is provided with a first one-way valve, and when the pressure in the water storage area increases to a positive pressure, the first one-way valve allows gas to be discharged from the water storage area through the first one-way valve; the first piston rod is used to retain liquid in the water storage area before discharging the gas; after discharging the gas, the first piston rod allows the liquid to be discharged from the water storage area; A first sub-cylinder and a second sub-cylinder extend from the bottom of the first cylinder. The inner wall diameter of the first sub-cylinder is smaller than the inner wall diameter of the second sub-cylinder, and the second piston can be closely attached to the inner circumferential wall of the first sub-cylinder. A second one-way valve is provided at the water inlet, and a third one-way valve is provided at the water outlet. When the water storage area is in a negative pressure state, bubbles in the water sample in the water storage area precipitate and separate from the water sample, so that the water sample is divided into gas and liquid; when the water storage area is in a normal pressure state or a positive pressure state, the liquid flows out of the first cylinder; The drive assembly includes a rotating rod and a connecting structure, one end of the connecting structure is movably connected to the rotating rod, and the other end of the connecting structure is connected to the first piston. When the rotating rod rotates around its own axis, the first piston slides along the central axis of the first cylinder. A slide is provided on the rotating rod, and the connecting structure includes a first connecting rod. The first connecting rod drives the first piston to reciprocate along the central axis of the first cylinder along the slide. The connecting structure includes a second connecting rod, one end of the second connecting rod is connected to the first piston, and the other end of the second connecting rod is slidably connected to the first connecting rod; The first connecting rod and the second connecting rod are connected by an elastic member, and the elastic force of the elastic member always makes the first connecting rod and the second connecting rod approach each other or tend to approach each other; The first connecting rod and the second connecting rod fit tightly together, so that the area where the elastic part is located is a sealing area. The sealing area prevents the first connecting rod and the second connecting rod from relative displacement when the first piston moves in the opposite direction, thereby making the movement displacement of the first piston positively correlated with the gas content in the water sample.

2. The rapid in-situ water quality detection device according to claim 1, characterized in that: The first connecting rod is provided with an air pressure valve, which restores the elastic member to an initial state.

3. The rapid in-situ water quality detection device according to claim 1, characterized in that: The driving component includes a baffle, which is used to prevent the water sample from continuing to enter the water storage area after the water sample in the water storage area reaches a preset value.

4. The rapid in-situ water quality detection device according to any one of claims 1 to 3, characterized in that: The water inlet is used to allow the water sample to enter the water storage area. The water inlet is provided with a first filter screen, and the first filter screen is used to isolate impurities in the water sample.

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