A purge and capture device for water quality detection

Abstract

The present invention provides a purging and capturing device for water quality testing, comprising: a bubble generating assembly, the bubble generating assembly comprising a first bubble plate and a second bubble plate, the first bubble plate and the second bubble plate being located within a spherical tube, and the first bubble plate and the second bubble plate being able to switch positions within the spherical tube, and the aperture of the first bubble plate being larger than the aperture of the second bubble plate. When in a mixed gas operating condition, the outer wall of the first bubble plate closely fits the interior of the spherical tube, and the second bubble plate is separated from contact with the inner wall of the spherical tube; when in a pure carrier gas operating condition, the outer wall of the second bubble plate closely fits the inner wall of the spherical tube, and the first bubble plate is separated from contact with the inner wall of the spherical tube. Thus, by adopting the first bubble plate and the second bubble plate of different apertures, the smooth passage of the mixed gas is ensured under the mixed gas operating condition; under the pure carrier gas operating condition, the mass transfer efficiency is improved, and the purging capability of the target substance in the water sample is enhanced.

Description

Technical Field

[0001] The present invention relates to the field of environmental analysis instruments, in particular to a purge and capture device for water quality detection. Background Art

[0002] Purge and trap devices for water quality testing are used to pre-treat water samples and improve test accuracy. They use carrier gas to bubble through a bubble plate into the water sample. The carrier gas fully contacts the water sample, sweeping trace amounts of target substances, such as volatile organic compounds, into the vapor phase. These volatile substances are then adsorbed and concentrated by a trap, separating them from other impurities such as water. The trap is then heated and desorbed with carrier gas, delivering the concentrated target substances to the testing instrument. This enables accurate detection of trace contaminants in the water, providing critical evidence for assessing water quality.

[0003] In the existing water quality testing process, if the target substance in the water sample is highly volatile and the detection accuracy requirements are mainly focused on fast and stable detection of the target substance, pure carrier gas can be used at this time.

[0004] When the target volatile substance in a water sample is low in concentration and improved purge efficiency and capture effectiveness are needed, a mixed gas is used. This gas mixture leverages the characteristics of different gases to enhance the purge capability of the target substance. For example, certain organic pollutants have low solubility and low volatility in water, making them difficult to purge efficiently with a single pure carrier gas. Complete removal of these substances from the water requires a significant time, and the addition of other gas components to the mixed gas can improve the mass transfer process between the bubbles and the liquid, thus increasing purge efficiency.

[0005] In the purge-and-trap process for water quality testing, when using pure carrier gas to purge water samples, using a large-aperture bubble plate results in a small contact area between the large bubbles and the water sample, resulting in low mass transfer efficiency. This makes it difficult to efficiently transfer volatile substances from the water sample to the gas phase, compromising detection sensitivity and accuracy. When using a mixed gas purge, the highly viscous gas mixture, if still using a small-aperture bubble plate, will be too high to allow the gas mixture to pass smoothly, severely hindering the proper purge process.

[0006] The information disclosed in the background technology section of the present invention is only intended to deepen the understanding of the general background technology of the present invention, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. Summary of the Invention

[0007] Based on this, it is necessary to provide a purge and capture device for water quality detection to address the problem of poor adaptability of the bubble plate caused by differences in gas properties in the current purge and capture device for water quality detection.

[0008] The above purpose is achieved through the following technical solutions:

[0009] A purge and capture device for water quality detection, comprising:

[0010] Spherical tube;

[0011] The purge assembly includes a pure gas connecting pipe and a mixed gas connecting pipe. The pure gas connecting pipe is used to introduce pure carrier gas, and the mixed gas connecting pipe is used to introduce mixed gas.

[0012] A bubble generating assembly includes a first bubble plate and a second bubble plate, wherein the first bubble plate and the second bubble plate are located in the spherical tube, and the first bubble plate and the second bubble plate can switch positions in the spherical tube, and the aperture of the first bubble plate is larger than the aperture of the second bubble plate.

[0013] Among them, when in a mixed gas working condition, the outer wall of the first bubble plate is tightly fitted to the inside of the spherical tube, and the second bubble plate is detached from contact with the inner wall of the spherical tube, that is, the first bubble plate is in a sealed state and the second bubble plate is in an open state; when in a pure carrier gas working condition, the outer wall of the second bubble plate is tightly fitted to the inner wall of the spherical tube, and the first bubble plate is detached from contact with the inner wall of the spherical tube, that is, the second bubble plate is in a sealed state and the first bubble plate is in an open state.

[0014] A driving mechanism is used to switch the working states of the first bubble plate and the second bubble plate.

[0015] In one embodiment, the driving mechanism includes a rotating frame, the first bubble plate and the second bubble plate are slidably connected to the rotating frame, and the rotating frame is used to drive the first bubble plate and the second bubble plate to switch positions by rotating.

[0016] In one embodiment, the driving mechanism includes a counterweight structure, and the counterweight structure is used to adjust the distance between the first bubble plate and the second bubble plate and the inner wall of the spherical tube.

[0017] In one embodiment, the rotating frame is provided with a plurality of adjustment cylinders, the first bubble plate and the second bubble plate are slidably connected to the adjustment cylinder, the counterweight structure includes a plurality of counterweight blocks, the counterweight blocks are slidably located in the adjustment cylinder, the counterweight blocks, the first bubble plate and the adjustment cylinder surround to form a first chamber, the counterweight blocks, the second bubble plate and the adjustment cylinder surround to form a second chamber, the counterweight blocks, the adjustment cylinder, the first chamber and the second chamber are used to drive the first bubble plate and the second bubble plate to extend and retract under the action of gravity to adapt to different working states.

[0018] In one embodiment, a first elastic member is provided between the counterweight block and the adjusting tube, and the elastic force of the first elastic member always causes the counterweight block to be located at a preset position or to have a tendency to approach the preset position.

[0019] In one embodiment, a flow guide component is included, and the flow guide component is located between the first bubble plate and the second bubble plate, and the flow guide component is used to uniformly mix the mixed gas.

[0020] In one embodiment, the guide assembly includes a plurality of guide plates, which are rotatably connected to the inner wall of the spherical tube. The second bubble plate is provided with a magnetic control assembly, which controls the rotation angle of the guide plate through magnetic interaction. Under mixed gas conditions, the guide plates are tilted to form a mixing flow channel; under pure carrier gas conditions, the guide plates are vertical to reduce flow resistance.

[0021] In one embodiment, the guide assembly includes a limiting structure, which is used to constrain the maximum rotation angle of the guide plate to stabilize the airflow direction.

[0022] In one embodiment, the driving mechanism includes a sliding block, and a sliding groove is provided on the outer wall of the spherical tube. When the first bubble plate and the second bubble plate are in a switching state, the sliding block and the sliding groove are used to tighten the guide plate to avoid interference between the guide plate and the first bubble plate and the second bubble plate, and after the first bubble plate and the second bubble plate are switched, the sliding block and the sliding groove make the guide plate open.

[0023] In one embodiment, a second elastic member is provided between the plurality of guide plates, and the two ends of the second elastic member are respectively connected to two adjacent guide plates, and the elastic force of the second elastic member always causes the two guide plates to move away from each other or have a tendency to move away from each other.

[0024] The beneficial effects of the present invention are:

[0025] The present invention provides a purging and capturing device for water quality testing, comprising: a bubble generating assembly, the bubble generating assembly comprising a first bubble plate and a second bubble plate, the first bubble plate and the second bubble plate being located within a spherical tube, and the first bubble plate and the second bubble plate being able to switch positions within the spherical tube, and the aperture of the first bubble plate being larger than the aperture of the second bubble plate. When in a mixed gas operating condition, the outer wall of the first bubble plate closely fits the interior of the spherical tube, and the second bubble plate is detached from contact with the inner wall of the spherical tube; when in a pure carrier gas operating condition, the outer wall of the second bubble plate closely fits the inner wall of the spherical tube, and the first bubble plate is detached from contact with the inner wall of the spherical tube. Thus, by adopting the first bubble plate and the second bubble plate of different apertures, the smooth passage of the mixed gas is ensured under the mixed gas operating condition; under the pure carrier gas operating condition, the mass transfer efficiency is improved, and the purging capability of the target substance in the water sample is enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic structural diagram of a purge and capture device for water quality testing provided by one embodiment of the present invention;

[0027] Figure 2 for Figure 1 Side view of the purge and trap device used for water quality testing;

[0028] Figure 3 for Figure 2 AA cross-sectional diagram of the purge and trap device for water quality testing;

[0029] Figure 4 for Figure 3 A partial enlarged view of location D of the purge and capture device for water quality testing;

[0030] Figure 5 A schematic diagram of the structure of a spherical tube of a purge and capture device for water quality testing provided by one embodiment of the present invention;

[0031] Figure 6 for Figure 5 Schematic diagram of the BB section of the spherical tube of the purge and trap device for water quality testing;

[0032] Figure 7 for Figure 5 Schematic diagram of the CC cross section of the spherical tube of the purge and capture device for water quality testing before the first and second bubble plates are switched;

[0033] Figure 8 for Figure 5 Schematic diagram of the CC cross section of the spherical tube during the switching between the first and second bubble plates of the purge and capture device for water quality testing;

[0034] Figure 9 for Figure 5Schematic diagram of the CC cross section of the spherical tube of the purge and capture device for water quality testing after the first and second bubble plates are switched;

[0035] Figure 10 An exploded view of a bubble generating assembly in a purge and capture device for water quality testing provided by one embodiment of the present invention;

[0036] Figure 11 This is a structural schematic diagram of a limiting structure in a purge and capture device for water quality detection provided by one embodiment of the present invention.

[0037] in:

[0038] 100, purge assembly; 110, pure gas connecting pipe; 120, mixed gas connecting pipe;

[0039] 200, bubble generating assembly; 210, first bubble plate; 220, second bubble plate; 221, magnetic control assembly;

[0040] 300, driving mechanism; 310, rotating frame; 311, adjusting cylinder; 320, counterweight structure; 321, counterweight block; 322, first elastic member; 330, sliding block; 340, sliding slot;

[0041] 400, guide assembly; 410, guide plate; 411, magnetic block; 412, connecting block; 420, limiting structure; 430, second elastic member;

[0042] 500. Spherical tube. DETAILED DESCRIPTION

[0043] 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.

[0044] 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.

[0045] 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.

[0046] Refer to the following Figures 1-11 The following describes a purge and capture device for water quality detection provided by an embodiment of the present invention.

[0047] like Figures 1-4 As shown, the purging and trapping device for water quality testing provided in the embodiment of the present invention is particularly suitable for purging and trapping volatile gases in various water samples for water quality testing. Of course, it can also be used for purging and trapping operations of other samples containing volatile gases such as soil samples.

[0048] Specifically, the purge and capture device for water quality detection provided by the embodiment of the present invention includes a purge component 100 , a bubble generating component 200 and a driving mechanism 300 .

[0049] The purge assembly 100 provides purge power and a transport medium. By introducing a carrier gas (e.g., pure carrier gas or a mixed gas), the purge assembly 100 removes volatile substances from the water sample. The carrier gas flows within the device, creating a driving force that promotes the transfer of volatile substances from the liquid phase to the gas phase, thereby separating and enriching the target substances in the water sample.

[0050] The bubble generation assembly 200 is used to generate uniform, stable bubbles. When the carrier gas passes through the bubble generation assembly 200, it is dispersed into tiny bubbles that enter the water sample. These tiny bubbles have a large specific surface area, which increases the contact area between the carrier gas and the water sample, improving mass transfer efficiency and enabling more complete transfer of volatile substances from the water to the carrier gas, thereby enhancing the purge and trap effect and detection accuracy.

[0051] The driving mechanism 300 serves as a power source in the purge and capture device for water quality detection, and provides power for the movement of other components, including but not limited to providing carrier gas for the purge assembly 100 .

[0052] It is understood that the drive mechanism 300 can be a common drive form, such as an electric motor, an internal combustion engine, etc. The power source in the drive mechanism 300 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.

[0053] During the purge and trapping process for water quality testing, different purge gases are required due to the varying properties of volatile substances in the water sample. When using pure carrier gas for purging, a small-aperture bubble plate can generate stable microbubbles, significantly increasing the gas-liquid contact area. This effectively improves the mass transfer efficiency of volatile substances from the water sample to the gas phase, ensuring detection sensitivity and accuracy.

[0054] However, when using mixed gas purging, due to the strong viscosity of the mixed gas, if the small-aperture bubble plate is continued to be used, the gas flow resistance will be too large, affecting the purging process. In this case, a large-aperture bubble plate is required to ensure that the mixed gas can pass smoothly.

[0055] However, the large bubbles formed by the large-aperture bubble plate when used for pure carrier gas purging have poor stability and are easy to break, and cannot effectively and stably carry the substances to be detected in the water, resulting in a low mass transfer rate.

[0056] Based on this, the bubble generating assembly 200 includes a first bubble plate 210 and a second bubble plate 220 . The first bubble plate 210 is used for the mixed gas to pass through, and the second bubble plate 220 is used for the pure carrier gas to pass through.

[0057] Specifically, the purge assembly 100 includes a pure gas connecting pipe 110 and a mixed gas connecting pipe 120. The pure gas connecting pipe 110 is used to introduce pure carrier gas, and the mixed gas connecting pipe 120 is used to introduce mixed gas. A Venturi tube is provided at the connection point between the pure gas connecting pipe 110 and the mixed gas connecting pipe 120.

[0058] The main body of the Venturi tube is composed of a gradually contracting section, a throat and a gradually expanding section connected in sequence.

[0059] When the various gases from the purge assembly 100 intersect at the venturi tube, the various gases enter the venturi tube at their respective initial flow rates and pressures.

[0060] In the converging section, as the cross-sectional area of ​​the pipe decreases, the gas velocity increases and the pressure decreases accordingly. Upon entering the throat, the gas velocity reaches its maximum and the pressure drops to its minimum, forming a low-pressure zone in the throat. Gases from different sources are intensely drawn in and mixed at the throat.

[0061] As the Brownian motion of gas molecules in high-speed flow and low-pressure environment intensifies, the components in the pure carrier gas and the mixed gas can diffuse and penetrate each other more fully, achieving preliminary mixing.

[0062] In the gradual expansion section, the cross-sectional area of ​​the pipe gradually increases, the gas flow rate slows down, the pressure rises, and the mixed gas flows out of the Venturi tube in a relatively stable state and enters the subsequent purge and capture process.

[0063] The purge-and-trap bottle is configured as a spherical tube 500, which is used to hold the water sample and provide a reaction space for the purge-and-trap process. A first bubble plate 210 and a second bubble plate 220 are located within the spherical tube 500, and the first bubble plate 210 and the second bubble plate 220 can switch positions within the spherical tube 500. The aperture of the first bubble plate 210 is larger than the aperture of the second bubble plate 220.

[0064] When in a mixed gas working condition, the outer wall of the first bubble plate 210 is tightly fitted to the inside of the spherical tube 500, and the second bubble plate 220 is out of contact with the inner wall of the spherical tube 500, that is, the first bubble plate 210 is in a sealed state, and the second bubble plate 220 is in an open state; when in a pure carrier gas working condition, the outer wall of the second bubble plate 220 is tightly fitted to the inner wall of the spherical tube 500, and the first bubble plate 210 is out of contact with the inner wall of the spherical tube 500, that is, the second bubble plate 220 is in a sealed state, and the first bubble plate 210 is in an open state.

[0065] When in a mixed gas working state, the mixed gas requires a larger circulation space to reduce resistance due to its strong viscosity. At this time, the outer wall of the first bubble plate 210 fits tightly against the inside of the spherical tube 500 and is in a sealed state. The mixed gas can only enter the water sample in the spherical tube 500 through the larger aperture on the first bubble plate 210. The bubble plate with a larger aperture allows the mixed gas to pass more smoothly, reducing the problem of poor circulation caused by gas viscosity. At the same time, the second bubble plate 220 is out of contact with the inner wall of the spherical tube 500 and is in an open state. It will not cause significant obstruction to the purging path of the mixed gas, thereby ensuring the high efficiency of the mixed gas purging process.

[0066] When operating in a pure carrier gas mode, the pure carrier gas needs to form tiny, stable bubbles during the purge process to increase its contact area with the water sample. Therefore, the outer wall of the second bubble plate 220 is tightly fitted against the inner wall of the spherical tube 500, creating a sealed state. The pure carrier gas enters the water sample through the smaller apertures in the second bubble plate 220, generating tiny bubbles and effectively improving mass transfer efficiency. Simultaneously, the first bubble plate 210 is released from contact with the inner wall of the spherical tube 500, remaining in an open state to avoid unnecessary interference with the flow of the pure carrier gas.

[0067] During the operation of the purge and capture device, after the water sample is injected into the spherical tube 500, the working condition is switched according to the preset detection program and the type of gas used.

[0068] If mixed gas purging is required, the driving mechanism 300 adjusts the first bubble plate 210 to a sealed state, and the mixed gas enters from the mixed gas connecting pipe 120 and enters the water sample through the first bubble plate 210 to perform a purging operation, thereby removing some substances in the water sample that are easily purged by the mixed gas.

[0069] When it is necessary to switch to pure carrier gas purging, the driving mechanism 300 switches the positions of the first bubble plate 210 and the second bubble plate 220 by rotating, so that the second bubble plate 220 is switched to a sealed state, and at the same time the first bubble plate 210 is turned to an open state, and pure carrier gas enters from the pure gas connecting pipe 110, and forms tiny bubbles through the second bubble plate 220 to purge the water sample.

[0070] Thus, by configuring the purge-and-collection bottle as a spherical tube 500 and employing first and second bubble plates 210 and 220 with different apertures, the adaptability of the bubble plates in conventional devices for purging gases of varying properties is resolved. Under mixed gas conditions, this ensures smooth passage of the mixed gas, avoiding purging difficulties caused by gas viscosity. Under pure carrier gas conditions, this improves mass transfer efficiency and enhances the ability to purge target substances in water samples.

[0071] Further, such as Figures 1-4 As shown, the driving mechanism 300 includes a rotating frame 310 , and the rotating frame 310 is used to drive the first bubble plate 210 and the second bubble plate 220 to switch positions by rotating.

[0072] Specifically, the rotating frame 310 is slidably connected to the first bubble plate 210 and the second bubble plate 220, and the rotating frame 310 can rotate around its own central axis. When the rotating frame 310 rotates, it can simultaneously drive the first bubble plate 210 and the second bubble plate 220 to switch positions, and the switching process is stable and reliable.

[0073] When mixed gas purging is required, the rotating frame 310 rotates so that the first bubble plate 210 moves above the second bubble plate 220, and the driving mechanism 300 drives the first bubble plate 210 and the second bubble plate 220 to move upward, so that the first bubble plate 210 is tightly fitted with the inner wall of the spherical tube 500 and is in a sealed state, and the second bubble plate 220 is detached from the inner wall of the spherical tube 500 and is in an open state.

[0074] When it is necessary to adjust to the pure carrier gas purge working condition, the driving mechanism 300 first drives the first bubble plate 210 to move downward, and then the rotating frame 310 rotates to adjust the second bubble plate 220 to above the first bubble plate 210. After the rotation of the rotating frame 310 is completed, the driving mechanism 300 drives the second bubble plate 220 and the first bubble plate 210 to move upward. The second bubble plate 220 fits tightly against the inner wall of the spherical tube 500 and is in a sealed state. The first bubble plate 210 is in an open state to avoid interference with the flow of pure carrier gas.

[0075] Therefore, by providing the rotating frame 310, the positions of the first bubble plate 210 and the second bubble plate 220 can be switched quickly and accurately, thereby improving the efficiency of switching the purge and capture device between different gas working conditions.

[0076] In other embodiments, the driving mechanism 300 may be directly connected to the first bubble plate 210 and the second bubble plate 220 to achieve regulation of the working states of the first bubble plate 210 and the second bubble plate 220 .

[0077] During actual operation, when the purge and capture device for water quality detection needs to switch from one gas purge condition to another, for example, from a pure carrier gas condition to a mixed gas condition, the transmission component enables rotational motion, directly pushing the first bubble plate 210 and the second bubble plate 220 to switch positions.

[0078] In one embodiment, Figure 5-Figure 9 As shown, the driving mechanism 300 includes a counterweight structure 320 , which is used to adjust the distance between the first bubble plate 210 and the second bubble plate 220 and the inner wall of the spherical tube 500 .

[0079] Specifically, the rotating frame 310 is provided with a plurality of adjustment cylinders 311 , and the first bubble plate 210 and the second bubble plate 220 are slidably connected to the adjustment cylinders 311 , so that the first bubble plate 210 and the second bubble plate 220 can flexibly perform telescopic movements in the adjustment cylinders 311 .

[0080] The counterweight structure 320 includes a plurality of counterweight blocks 321, which are located inside the adjusting cylinder 311 and can slide relative to the adjusting cylinder 311. The counterweight blocks 321 are provided with a third elastic member, which can fit the inner wall of the adjusting cylinder 311 and can drive the counterweight blocks 321 to slide along the inner wall of the adjusting cylinder 311.

[0081] A first chamber and a second chamber are formed in the adjustment cylinder 311. The first chamber connects the counterweight 321 and the first bubble plate 210, while the second chamber connects the counterweight 321 and the second bubble plate 220. This allows the counterweight 321 to drive the first bubble plate 210 and the second bubble plate 220 to expand and contract under the action of gravity to adapt to different working conditions.

[0082] When the mixed gas working condition needs to be adjusted and the first bubble plate 210 needs to be closely attached to the inner wall of the spherical tube 500, as the position of the rotating frame 310 changes, the counterweight 321 begins to slide in the adjustment cylinder 311 under the action of gravity.

[0083] Adjusting the position of the rotating frame 310 causes the counterweight 321 to slide vertically, sliding in a direction that increases the pressure in the first chamber. The volume of the first chamber decreases, increasing the pressure, pushing the first bubble plate 210 outward until its outer wall tightly contacts the inner wall of the spherical tube 500, forming a seal. Simultaneously, the volume of the second chamber increases, decreasing the pressure, causing the second bubble plate 220 to contract and break away from the inner wall of the spherical tube 500, resulting in an open state.

[0084] Similarly, when switching to pure carrier gas operation is required, the turret 310 is repositioned, and the counterweight 321 slides, increasing the pressure in the second chamber and decreasing the pressure in the first chamber. The second bubble plate 220 extends and fits tightly against the inner wall of the spherical tube 500, while the first bubble plate 210 retracts, completing the operating state switch.

[0085] Thus, the counterweight structure 320 enables automatic and precise adjustment of the distance between the first and second bubble plates 210, 220 and the inner wall of the spherical tube 500. The positions of the bubble plates can be quickly and accurately switched according to different working conditions, improving the device's response speed and ease of operation.

[0086] At the same time, since the counterweight structure 320 mainly relies on gravity and chamber pressure to drive the expansion and contraction of the bubble plate, it avoids the failure risk caused by complex transmission mechanisms and electronic components, reduces the maintenance cost of the equipment, and improves the stability and service life of the device.

[0087] In one embodiment, when the driving mechanism 300 is required to drive the first bubble plate 210 and the second bubble plate 220 to rotate and switch positions, in order to ensure that the bubble plates are tightly fitted with the inner walls of the spherical tube 500 in the working state and achieve a good sealing effect, there is a certain contact pressure between the bubble plates and the inner walls of the spherical tube 500, so that friction is generated between the first bubble plate 210 and the second bubble plate 220 and the inner walls of the spherical tube 500, resulting in increased wear of the bubble plates and the inner walls of the spherical tube 500, thereby shortening the service life of the purge and capture device.

[0088] like Figure 5-Figure 9 As shown, in order to reduce the friction between the first bubble plate 210 and the second bubble plate 220 and the spherical tube 500 when rotating and switching, a first elastic member 322 is provided between the counterweight block 321 and the adjustment tube 311 .

[0089] Specifically, the elastic force of the first elastic member 322 always causes the counterweight 321 to be located at the preset position or to have a tendency to approach the preset position.

[0090] When the rotating frame 310 drives the adjustment tube 311 to rotate and approach a horizontal position, the counterweight 321, originally distributed along the axial direction of the adjustment tube 311 under the action of gravity, is now subjected to a gravity force in a direction that is nearly perpendicular to the axis of the adjustment tube 311. This reduces the effect of gravity on the position of the counterweight 321 within the adjustment tube 311. Due to its inherent elastic restoring properties, the first elastic member 322 pushes the counterweight 321 toward the center of the adjustment tube 311.

[0091] As the counterweight 321 moves toward the center, the pressure distribution within the first and second chambers adjusts. The force generated by the pressure differential causes the distance between the first and second bubble plates 210, 220 and the inner wall of the spherical tube 500 to gradually reach a predetermined position. This predetermined position is when the first and second bubble plates 210, 220 are sufficiently away from the inner wall of the spherical tube 500. The rotating frame 310 then continues to rotate, completing the positional switching of the bubble plates. Consequently, as the first and second bubble plates 210, 220 rotate, the contact area and pressure between them and the inner wall of the spherical tube 500 are reduced, thereby reducing friction.

[0092] After the switching is completed, the adjustment cylinder 311 leaves the horizontal position. Under the action of gravity, the counterweight block 321 overcomes the elastic force of the first elastic member 322 and moves to the corresponding working position again. The first bubble plate 210 and the second bubble plate 220 stretch or shrink again to the corresponding working state of being in contact with or separated from the inner wall of the spherical tube 500 to adapt to the new purge gas working condition.

[0093] Therefore, by providing the first elastic member 322 , the friction between the first bubble plate 210 and the second bubble plate 220 and the spherical tube 500 is effectively reduced, which greatly slows down the wear rate of the components.

[0094] In one embodiment, Figure 5-Figure 11 As shown, in order to prevent uneven mixed gas from causing different volatile substances in the water sample to have different opportunities to contact the gas, the purge and capture device for water quality detection provided by an embodiment of the present invention includes a guide component 400, which is used to uniformly mix the mixed gas.

[0095] Specifically, the deflector assembly 400 is located between the first bubble plate 210 and the second bubble plate 220. The deflector assembly 400 includes multiple deflectors 410 and a limiting structure 420. The multiple deflectors are arranged at intervals and rotatably connected to the inner wall of the spherical tube 500. Magnetic blocks 411 are provided on both sides of the deflectors 410. The limiting structure 420 is used to limit the maximum rotation angle of the deflectors 410 to stabilize the airflow direction.

[0096] The second bubble plate 220 is provided with a magnetic control component 221. The magnetic control component 221 and the guide plate 410 are staggered in the vertical direction. The magnetic control component 221 controls the rotation of the guide plate 410 through magnetic interaction.

[0097] When in the mixed gas purge mode, the second bubble plate 220 is located below the guide plate 410. At this point, the magnetic control assembly 221 and the magnet block 411 at the closer end of the guide plate 410 repel each other magnetically. The guide plates 410 gradually tilt under the repulsive force. The limiting structure 420 causes multiple guide plates 410 to tilt at the same preset angle, forming a mixed flow channel. This forces the mixed gas to change its flow direction, significantly increasing the frequency of collisions between gas molecules of different components and greatly improving the uniformity of the mixed gas.

[0098] When switching to the pure carrier gas purge mode, the second bubble plate 220 moves above the guide plate 410. At this time, the magnetic control component 221 and the magnet block 411 at the end of the guide plate 410 that is closer to each other are magnetically attracted. The magnetic force of the opposite magnetic poles attracting each other causes the guide plate 410 to quickly rotate to a vertical state. For pure carrier gas, the vertical guide plate 410 can minimize the resistance during the flow of pure carrier gas, ensuring that the pure carrier gas can pass through at a stable and efficient flow rate, thereby improving the purge efficiency.

[0099] Thus, through the flow guide assembly 400, the flow guide plate 410 rotates and tilts during mixed gas purging, ensuring uniform mixing of the mixed gas and ensuring uniform contact between the various volatile substances in the water sample and the mixed gas. For pure carrier gas purging, the flow guide plate 410 is vertically positioned to reduce the flow resistance of the pure carrier gas and improve purging efficiency.

[0100] Further, such as Figure 5-Figure 11 As shown, the driving mechanism 300 includes a sliding block 330, and a sliding groove 340 is provided on the outer wall of the spherical tube 500. When the first bubble plate 210 and the second bubble plate 220 are in a switching state, the sliding block 330 and the sliding groove 340 are used to tighten the guide plate 410 to avoid interference of multiple guide plates 410 with the position switching of the first bubble plate 210 and the second bubble plate 220, and after the first bubble plate 210 and the second bubble plate 220 complete the switching, the sliding block 330 and the sliding groove 340 make the guide plate 410 open.

[0101] Specifically, the plurality of guide plates 410 are arranged as a plurality of identical units, so that the guide plates 410 in the unit can move toward both ends of the rotating frame 310 to complete the contraction.

[0102] The sliding block 330 is set to a magnetic material, and the guide plate 410 is provided with a connecting block 412. The sliding block 330 moves the connecting block 412 of the guide plate 410 corresponding to the sliding block 330 in the unit through the magnetic drive, thereby causing the multiple guide plates 410 in the unit to shrink, ensuring that the guide plate 410 will not interfere during the switching process between the first bubble plate 210 and the second bubble plate 220.

[0103] When the first bubble plate 210 and the second bubble plate 220 are in the switching state, the sliding block 330 slides forward along the sliding groove 340 under the power of the driving mechanism 300. At this time, the sliding block 330 drives the guide plate 410 to move and retract.

[0104] During the switching process between the first bubble plate 210 and the second bubble plate 220 , the guide plate 410 is in a contracted state, thereby preventing the guide plate 410 from interfering with the first bubble plate 210 and the second bubble plate 220 that are switching positions.

[0105] After the first bubble plate 210 and the second bubble plate 220 are switched, the sliding block 330 slides in the opposite direction along the sliding groove 340 , so that the guide plate 410 opens and returns to the working state.

[0106] Therefore, the guide plate 410 is adjusted by the sliding block 330 and the sliding groove 340, effectively preventing the interference problem between the first bubble plate 210 and the second bubble plate 220 and the guide plate 410 during the switching process, thereby improving the stability and reliability of the device operation.

[0107] In one embodiment, Figure 5-Figure 9 As shown, a second elastic member 430 is provided between the plurality of guide plates 410 , and two ends of the second elastic member 430 are respectively connected to two adjacent guide plates 410 . The second elastic member 430 is used to ensure that the plurality of guide plates 410 are evenly distributed.

[0108] Specifically, the elastic force of the second elastic member 430 always causes the two guide plates 410 to move away from each other or have a tendency to move away from each other.

[0109] When the device is working normally, under the action of the second elastic member 430 , the guide plates 410 maintain a certain spacing distance between adjacent guide plates 410 and are evenly distributed between the first bubble plate 210 and the second bubble plate 220 .

[0110] When the first bubble plate 210 and the second bubble plate 220 are switching states, in order to avoid interference between the guide plate 410 and the first bubble plate 210 and the second bubble plate 220, when the sliding block 330 slides forward along the sliding groove 340 on the outer wall of the spherical tube 500, the guide plate 410 overcomes the elastic force of the second elastic member 430 and contracts. The multiple guide plates 410 are close to each other and are in a tightened state, avoiding interference with the first bubble plate 210 and the second bubble plate 220 that are switching positions, thereby ensuring the smoothness and accuracy of the switching process.

[0111] After the first bubble plate 210 and the second bubble plate 220 have been switched, the sliding block 330 slides in the opposite direction along the sliding groove 340, releasing the elastic force of the second elastic member 430. Under the action of the elastic force of the second elastic member 430 and the sliding block 330, the multiple guide plates 410 quickly return to their open state, away from each other, and are evenly redistributed between the first bubble plate 210 and the second bubble plate 220.

[0112] Therefore, by providing the second elastic member 430 , it is ensured that the guide plate 410 can be evenly distributed during normal operation.

[0113] 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.

[0114] 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 purge and capture device for water quality detection, characterized in that: include: Spherical tube; A purge assembly, comprising a pure gas connecting pipe and a mixed gas connecting pipe, wherein the pure gas connecting pipe is used to introduce pure carrier gas, and the mixed gas connecting pipe is used to introduce mixed gas; a bubble generating assembly, the bubble generating assembly comprising a first bubble plate and a second bubble plate, the first bubble plate and the second bubble plate being located within the spherical tube and capable of switching positions within the spherical tube, the aperture of the first bubble plate being larger than the aperture of the second bubble plate; Wherein, in a mixed gas working condition, the outer wall of the first bubble plate is tightly attached to the interior of the spherical tube, and the second bubble plate is separated from contact with the inner wall of the spherical tube, that is, the first bubble plate is in a sealed state and the second bubble plate is in an open state; in a pure carrier gas working condition, the outer wall of the second bubble plate is tightly attached to the inner wall of the spherical tube, and the first bubble plate is separated from contact with the inner wall of the spherical tube, that is, the second bubble plate is in a sealed state and the first bubble plate is in an open state; A driving mechanism is provided, wherein the driving mechanism is used to switch the working states of the first bubble plate and the second bubble plate. The driving mechanism includes a rotating frame and a counterweight structure. The first bubble plate and the second bubble plate are slidably connected to the rotating frame. The rotating frame is used to drive the first bubble plate and the second bubble plate to switch positions by rotation; the counterweight structure is used to adjust the distance between the first bubble plate and the second bubble plate and the inner wall of the spherical tube.

2. A purge and capture device for water quality detection according to claim 1, characterized in that: The rotating frame is provided with multiple adjustment cylinders, the first bubble plate and the second bubble plate are slidably connected to the adjustment cylinder, the counterweight structure includes multiple counterweight blocks, the counterweight blocks are slidably located in the adjustment cylinder, the counterweight blocks, the first bubble plate and the adjustment cylinder surround to form a first chamber, the counterweight blocks, the second bubble plate and the adjustment cylinder surround to form a second chamber, the counterweight blocks, the adjustment cylinder, the first chamber and the second chamber are used to drive the first bubble plate and the second bubble plate to extend and retract under the action of gravity to adapt to different working states.

3. A purge and capture device for water quality detection according to claim 2, characterized in that: A first elastic member is provided between the counterweight block and the adjusting tube, and the elastic force of the first elastic member always causes the counterweight block to be located at a preset position or to have a tendency to approach the preset position.

4. A purge and capture device for water quality detection according to claim 1, characterized in that: It includes a flow guide component, which is located between the first bubble plate and the second bubble plate, and is used to uniformly mix the mixed gas.

5. A purge and capture device for water quality detection according to claim 4, characterized in that: The guide assembly includes multiple guide plates, which are rotatably connected to the inner wall of the spherical tube. The second bubble plate is provided with a magnetic control assembly, which controls the rotation angle of the guide plate through magnetic interaction. Under mixed gas conditions, the guide plates are tilted to form a mixing flow channel; under pure carrier gas conditions, the guide plates are vertical to reduce flow resistance.

6. A purge and capture device for water quality detection according to claim 5, characterized in that: The guide assembly includes a limiting structure, which is used to constrain the maximum rotation angle of the guide plate to stabilize the airflow direction.

7. A purge and capture device for water quality detection according to claim 5, characterized in that: The driving mechanism includes a sliding block, and a sliding groove is provided on the outer wall of the spherical tube. When the first bubble plate and the second bubble plate are in a switching state, the sliding block and the sliding groove are used to tighten the guide plate to avoid interference between the guide plate and the first bubble plate and the second bubble plate. After the first bubble plate and the second bubble plate are switched, the sliding block and the sliding groove enable the guide plate to be opened.

8. A purge and capture device for water quality detection according to claim 7, characterized in that: A second elastic member is provided between the plurality of guide plates, and two ends of the second elastic member are respectively connected to two adjacent guide plates. The elastic force of the second elastic member always makes the two guide plates move away from each other or have a tendency to move away from each other.

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