Seawater sampling device

Abstract

A seawater sampling device, including a water sampling bucket, a bucket mouth cover, a plug ball and a lifting cable, wherein the water sampling bucket is a cylinder with a hemispherical bottom, the cylinder wall is provided with a seawater inlet and outlet hole, the bucket mouth cover is composed of a cylindrical cover cylinder and a hemispherical cover cap, the bucket mouth cover is connected with the water sampling bucket by screw thread, the cover cap is provided with a through hole at the top, the plug ball is connected with the lifting cable at the top, and the plug ball and the inner wall of the water sampling bucket form a piston component under the action of the lifting cable, the piston component can move upward from the bottom through the seawater inlet and outlet hole into the bucket mouth cover, and partially pass through the through hole to form a plug. The piston component formed by the plug ball is not only reduced the frictional resistance, but also more convenient to lift the device, and through the reasonable layout of the seawater inlet and outlet hole and the movement control of the plug ball, the device can only take water at the target depth, accurately obtain the water sample at a specific depth, avoid the mixing of water samples at different layers, and the device has the advantages of simple structure, easy operation, accurate sampling, and can provide accurate water sample for ship cargo weight calculation or water quality monitoring.

Description

Technical Field

[0001] This utility model relates to a sampling device, and more particularly to a seawater sampling device, belonging to the technical field of manufacturing seawater testing and sampling devices. Background Technology

[0002] Seawater sampling devices are specialized equipment for obtaining water samples from oceans, lakes, rivers, and other bodies of water. They are widely used in marine environmental monitoring, water pollution investigation, maritime cargo measurement, and marine scientific research. Therefore, accurately obtaining seawater samples at specific depths is of vital importance for ensuring the representativeness of water quality analysis results, the accuracy of ship cargo calculations, and the scientific nature of marine environmental assessments.

[0003] In the field of marine transportation, when ships use draft surveys to calculate cargo capacity, seawater density is a key parameter, and the accuracy of density measurement results directly depends on the representativeness and accuracy of the water samples taken.

[0004] Representative seawater samples are typically taken from the ship's centerline, as this location most accurately reflects the seawater density corresponding to the ship's actual displacement. Currently, various types of seawater sampling devices are available on the market, which can be categorized by their working principle into traditional open / closed samplers, ball valve samplers, plug samplers, and self-sinking / floating samplers, among others.

[0005] Traditional open-closed samplers typically employ a barrel structure with a water inlet at the bottom and a check valve inside. Sometimes, a flip-top cover is also installed on the top of the barrel. For example, the utility model patent "Seawater Sampling Device" (authorization announcement number: CN 222913208 U) includes basic components such as a water sampling barrel, a barrel cover, and a stopper. Its working principle is to allow water to enter through the seawater inlet and outlet holes opened in the upper wall of the water sampling barrel, and to control the water inlet and outlet by using the up and down movement of the stopper inside the water sampling barrel. Although this type of sampler solves the problem of sampling at specific depths to a certain extent, its structure is relatively complex, inconvenient to operate, and the sampling quality may be affected by the stopper not sealing properly or improper operation during the sampling process.

[0006] Ball valve samplers are another common type of seawater sampling equipment. They typically use a ball valve structure to collect and seal water samples. For example, the invention patent application "A sampler for pressure-holding and transferring deep-sea microorganisms" (application number: 201410161276) uses a fixed ball valve mechanism and a limit switch ball valve mechanism, achieving sample collection and sealing through the opening and closing action of the ball valve. Similarly, the invention patent "A shallow surface ball valve type high-fidelity deep-sea sediment sampler" (publication number: CN105445053A) also utilizes a ball valve sealing structure, setting a ball valve sealing mechanism at the lower end of the sampler. It is triggered by mechanical principles, has a compact structure, and operates stably. In this type of deep-water ball valve sampler, the "close-open-close" working mode can effectively avoid surface water pollution and is suitable for water quality sampling at different depths.

[0007] The embolized sampler mainly relies on the movement of the embolized component to collect samples. The main body of the device has an embolized block inside. By pushing the embolized block into the main body of the device through the push-pull rod, most of the seawater inside is discharged, reducing the seawater content and reducing the workload during the survey. The advantage is that it can effectively control the sampling volume, but there is a problem that the sealing performance of the embolized component decreases with the increase of the usage time.

[0008] Self-sinking and floating samplers utilize the principle of buoyancy adjustment to achieve water quality sampling at different depths. This type of sampling device uses a variable-volume float as a buoyancy regulator, and adjusts the device's depth in the water by controlling the inflation and deflation of the inflatable air cushion, thereby enabling the collection of water samples at different depths. This type of device can achieve automated sampling, but it has a complex structure and high manufacturing cost.

[0009] Although existing technologies offer various seawater sampling device designs, they still face a series of unresolved technical problems that directly affect the accuracy and reliability of seawater sampling. Traditional samplers typically employ a simple cylindrical structure with a flat or conical bottom. This structure generates significant resistance during underwater descent, impacting the sampler's descent speed and stability. Furthermore, traditional plug designs are often flat or cylindrical, resulting in high frictional resistance against the inner wall of the sampling tank. This not only makes operation laborious but also leads to wear and tear over time, affecting the sealing effect. For example, utility model patent CN 222913208... The plug-type sampler described in U has issues such as significant friction between the plug and the barrel wall during the up-and-down movement of the plug within the sampling bucket, leading to inconvenience in operation and a decrease in sealing effectiveness over time. Furthermore, existing samplers suffer from various sealing defects. Some samplers use simple mechanical seals, such as check covers or flap valves, which are prone to leaks or contamination during sampler lifting due to water flow impact or shaking. While some ball valve samplers offer improved sealing, their complex opening and closing mechanisms require precise triggering, resulting in difficult operation and low reliability. Moreover, existing seawater sampling devices face significant challenges in sampling accuracy. Many samplers begin to fill with water during descent, resulting in a mixture of seawater from different depths rather than a sample from the target depth. This is clearly unacceptable for applications requiring precise sampling at specific depths (such as the ship's centerline). Although some samplers incorporate delayed water ingress mechanisms, these are often structurally complex and inconvenient to operate. For example, CN... The traditional sampler mentioned in patent 222913208 U allows seawater to enter the tank through the inlet once it comes into contact with the sea surface. Before reaching the target depth, the tank is already full of seawater, resulting in inaccurate sampling. In addition, the existing devices are not convenient and reliable enough. In actual use, the ease of operation and reliability of many seawater sampling devices need to be improved. Utility Model Content

[0010] To overcome the shortcomings of existing technologies and meet the needs of accurate calculation of cargo weight on maritime vessels or monitoring of seawater quality at a certain depth, this utility model provides a seawater sampling device to accurately obtain seawater samples at a defined depth, thereby providing accurate samples for calculating cargo weight on maritime vessels or monitoring seawater quality at a defined depth. The following technical solution is provided for this purpose:

[0011] A seawater sampling device is used to collect seawater samples to provide parameters for seawater density required for calculating ship carrying capacity or to monitor seawater quality at a certain depth, comprising:

[0012] Water sampling bucket, bucket mask, embolization ball, and lifting cable;

[0013] The water collection bucket has a cylindrical body and a hemispherical bottom. The outer edge of the upper opening is provided with an upper external thread, and the upper cylindrical wall of the water collection bucket is also provided with multiple seawater inlet and outlet holes.

[0014] The barrel cover consists of a cylindrical cover and a hemispherical cover. The cover is connected to the cylindrical cover and can accommodate the plug ball. A through hole is cut at the top of the cover. The inner wall of the cylindrical cover is provided with an internal thread that matches the external thread of the upper part of the water collection barrel. The barrel cover can be threaded to the upper part of the water collection barrel.

[0015] The top of the embolizing ball is connected to the lifting cable, and when the lifting cable is pulled up, it forms a piston-like component by cooperating with the inner wall of the water collection bucket. The ball enters the cover of the bucket cover from the bottom of the water collection bucket through the seawater inlet and outlet hole and partially exits through the through hole, thereby plugging the through hole.

[0016] Furthermore, the inner contour of the hemispherical bottom of the water collection bucket is adapted to the lower contour of the embolization ball to form a continuous sealing surface.

[0017] Preferably, the seawater inlet and outlet holes are rectangular, evenly distributed on the upper wall of the water collection bucket, and the number is 4 to 8. The distance between the lower edge of the seawater inlet and outlet holes and the upper port of the water collection bucket is 1 / 5 to 1 / 4 of the total height of the water collection bucket.

[0018] Preferred:

[0019] The water collection bucket and the bucket cover are made of salt-resistant stainless steel or engineering plastic, respectively, and their inner walls are polished with a surface roughness of Ra≤0.8µm.

[0020] The embolization ball is a solid or hollow ball, and is made of polytetrafluoroethylene material or has a polytetrafluoroethylene coating on its surface;

[0021] The barrel-shaped mask also has a sealing ring embedded in the through hole of the cover.

[0022] Furthermore, the seawater sampling device also includes a ballast weight, which is located at the center of the spherical bottom of the water sampling bucket.

[0023] Preferably, the counterweight is a conical component, connected to the center of the spherical bottom of the water collection bucket by threaded connection or welding, and the weight of the counterweight is 1 to 3 times the weight of the water collection bucket itself.

[0024] Furthermore, the lower part of the water collection bucket is provided with a lower external thread that matches the internal thread of the cover. The cover can be threaded to the lower part of the water collection bucket and enclose the weight to become the base of the water collection bucket.

[0025] Furthermore, the seawater sampling device also includes a check cover, which is installed on the outside of the seawater inlet and outlet of the water sampling tank via a hinge on its upper part.

[0026] When the seawater in the water sampling bucket is discharged by the embolism ball moving upward, the seawater is opened. When the embolism ball continues to move upward and passes through the seawater inlet and outlet hole, the seawater enters the water sampling bucket through the seawater inlet and outlet hole. As the embolism ball continues to be lifted and drives the water sampling bucket to move upward, the check valve is pressed and sealed by the seawater inlet and outlet hole under the action of the seawater on the outside.

[0027] Furthermore, the seawater sampling device also includes a carrying mechanism, which includes a hook and a handle. The hook is disposed on opposite sides of the outer wall of the water sampling bucket. The hook is used to movably connect the handle. The handle is U-shaped, and an O-shaped hole is provided at the top of the U-shape of the handle and on the vertical center line of the water sampling bucket. The lifting cable passes through the O-shaped hole.

[0028] Preferably, the lifting cable is also provided with a label indicating its length and is attached with a float, which is red.

[0029] Compared with the prior art, the beneficial effects and advancements of this utility model are as follows:

[0030] The seawater sampling device provided by this utility model effectively addresses the shortcomings of existing technologies through structural optimization and design innovation, wherein:

[0031] The bottom of the water sampling bucket adopts a hemispherical structure, which reduces the resistance during the sinking process of the seawater sampling device and improves the sinking speed and stability.

[0032] As a piston-type component, the embolized ball can form a continuous sealing surface with the inner wall of the water collection tank, which reduces frictional resistance, makes operation easier, and avoids wear and sealing performance degradation caused by long-term use.

[0033] By rationally designing the layout and position of the seawater inlet and outlet holes, and combining this with the motion control of the embolized ball, it can be ensured that the sampler only starts to enter water at the target depth, thereby accurately obtaining water samples at a specific depth and avoiding the mixing of water samples from different depths.

[0034] The threaded connection between the barrel mask and the water collection barrel facilitates disassembly and maintenance, while the sealing ring at the through hole further enhances the reliability of the seal.

[0035] The use of counterweights facilitates rapid sinking and improves stability;

[0036] The check valve is designed to automatically seal the seawater inlet and outlet during the lifting process, preventing water sample leakage or contamination.

[0037] The carrying mechanism has simplified the operation process and improved ease of use;

[0038] The length label and float on the lifting cable facilitate precise control of the sampling depth;

[0039] In addition, the polishing treatment of the inner wall of the water collection bucket and the bucket cover, as well as the polytetrafluoroethylene material or coating of the embolization ball, further reduce friction and improve durability.

[0040] In summary, the seawater sampling device provided by this utility model can achieve substantial technical effects compared with the prior art, and therefore has great promotion and application value. Attached Figure Description

[0041] To more clearly illustrate the technical solution of this utility model, the accompanying drawings used in the embodiments of this utility model will be briefly introduced below.

[0042] It is obvious:

[0043] The accompanying drawings described below are only some of the embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort, but these other drawings also belong to the drawings required for the embodiments of this utility model.

[0044] Figure 1 A cross-sectional view of a seawater sampling device with rectangular seawater inlet and outlet holes, provided for an embodiment of this utility model;

[0045] Figure 2 A cross-sectional view of a seawater sampling device with an elliptical seawater inlet and outlet, provided for an embodiment of this utility model;

[0046] Figure 3 A cross-sectional view of a seawater sampling device with circular seawater inlet and outlet holes, provided for an embodiment of this utility model;

[0047] Figure 4 A three-dimensional structural diagram of an optimized seawater sampling device provided for an embodiment of this utility model;

[0048] Figure 5 This is a three-dimensional exploded view of an optimized seawater sampling device provided in an embodiment of the present invention.

[0049] In the picture:

[0050] 1-Water collection bucket, 101-Upper external thread, 102-Seawater inlet / outlet hole, 103-Lower external thread, 2-Bucket cover, 201-Cover cylinder, 202-Cover, 203-Through hole, 3-Embossed ball, 4-Lifting cable, 401-Label, 5-Sealing ring, 6-Battery weight, 7-Check valve cover, 8-Hanging ear, 9-Handle, 901-O-ring hole. Detailed Implementation

[0051] To make the objectives, technical solutions, beneficial effects, and significant advancements of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the accompanying drawings provided for the embodiments of this utility model. Obviously, all the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0052] It should be noted that the term "comprising" and any variations thereof in the specification and claims of this utility model are intended to cover non-exclusive inclusion, for example, including not only a series of listed technical features and structural components, but also optionally technical features and structural components not listed, or optionally the connection relationships between these technical features and structural components.

[0053] It should be understood that in the description of the embodiments of this utility model, the terms "upper", "lower", "one side", "both sides" and other indicative directional or positional terms are only based on the directional or positional relationship shown in the accompanying drawings of the embodiments of this utility model. They are used to facilitate the description of the embodiments of this utility model and to simplify the explanation, and are not intended to indicate or imply that the device or element must have a specific orientation, specific orientational structure and operation. Therefore, they should not be construed as limitations on this utility model.

[0054] In this utility model, unless otherwise explicitly specified and limited, the terms "set up" and "equipped with" should be interpreted broadly. For example, they can refer to a fixed setting, a detachable movable setting, or a fixed connection that is integrated. The connection can be a direct connection, an indirect connection through an intermediate medium, or a connection within two structural elements or an interaction between two elements. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0055] It should also be noted that:

[0056] The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0057] The technical solution of this utility model will now be described in detail with reference to specific embodiments.

[0058] Example 1

[0059] This embodiment provides a seawater sampling device for collecting seawater samples to provide parameters for seawater density required for ship carrying capacity calculation or to monitor seawater quality at a certain depth.

[0060] like Figure 1 A cross-sectional view of a seawater sampling device with rectangular seawater inlet and outlet holes, provided in an embodiment of this utility model. Figure 2 A cross-sectional view of a seawater sampling device with elliptical seawater inlet and outlet holes, provided as an embodiment of this utility model. Figure 3 A cross-sectional view of a seawater sampling device with circular seawater inlet and outlet holes, provided as an embodiment of this utility model, is shown below:

[0061] A seawater sampling device includes a water sampling bucket 1, a bucket cover 2, an embolization ball 3, and a lifting cable 4;

[0062] The water collection bucket 1 has a cylindrical body with a hemispherical bottom. The outer edge of the opening at the top is provided with an upper external thread 101. On the upper cylindrical wall of the water collection bucket 1, there are 4 to 8 seawater inlet and outlet holes 102. The distance between the lower edge of these seawater inlet and outlet holes 102 and the upper port of the water collection bucket 1 is about 1 / 5 to 1 / 4 of the total height of the water collection bucket.

[0063] The barrel cover 2 is composed of a cylindrical cover 201 and a hemispherical cover 202. The cover 202 is connected to the upper end of the cover 201. A through hole 203 is cut at the top of the cover 202. The inner wall of the cover 201 is provided with an internal thread that matches the upper external thread 101 of the water collection barrel 1, so that the barrel cover 2 can be connected to the upper part of the water collection barrel 1 by the thread, and the internal cavity of the cover 202 can accommodate the embolization ball 3.

[0064] The embolization ball 3 is a solid or hollow ball made of polytetrafluoroethylene (PTFE) or other suitable materials but coated with PTFE. Its top is connected to the lifting cable 4. The diameter of the embolization ball 3 is slightly smaller than the inner diameter of the water collection bucket 1, so that it can move up and down inside the water collection bucket 1 under the lifting of the lifting cable 4, and cooperate with the inner wall of the water collection bucket 1 to form a piston-like component. The inner contour of the hemispherical bottom of the water collection bucket 1 is adapted to the lower contour of the embolization ball 3, thereby forming a continuous sealing surface at the bottom.

[0065] The working process of this embodiment is as follows:

[0066] In the initial state, the embolization ball 3 is located at the bottom of the water collection bucket 1, sealing off its bottom space;

[0067] After the device provided in this embodiment is placed in water, it sinks under its own weight and the action of possible additional weights. During this process, since the bottom is blocked by the embolized ball 3 and the seawater inlet / outlet hole 102 is located at the top of the water collection bucket 1, seawater will enter the interior of the water collection bucket 1 from the through hole 203 cut at the top of the cover 202 and the seawater inlet / outlet hole 102, covering the top of the embolized ball 3.

[0068] When the device reaches the target depth, the lifting cable 4 is pulled upwards, the embolized ball 3 is lifted, and the seawater above the embolized ball 3 in the water sampling bucket 1 will be discharged from the through hole 203 and the seawater inlet and outlet hole 102.

[0069] When the embolization ball 3 is raised above the seawater inlet / outlet hole 102, the space below the embolization ball 3 can be filled with seawater flowing in from the seawater inlet / outlet hole 102. Stop lifting and hold for a moment, and the space below the embolization ball 3 in the water sampling bucket 1 will be filled with water sample at that depth.

[0070] Then, continue to pull up the lifting cable 4, and the upper part of the plug ball 3 will partially pass through the through hole 203, thereby plugging the through hole 203;

[0071] If you continue to pull up the lifting cable 4, the entire device will be lifted to the water surface by the embolism ball 3, thus completing the sampling of seawater at a determined depth.

[0072] Example 2

[0073] This embodiment provides an optimized seawater sampling device.

[0074] like Figure 4 A three-dimensional structural diagram of an optimized seawater sampling device provided for an embodiment of this utility model. Figure 5 An exploded three-dimensional structural diagram of an optimized seawater sampling device provided for an embodiment of this utility model is shown below:

[0075] An optimized seawater sampling device is a further optimization of the seawater sampling device provided in Example 1, namely:

[0076] The water collection bucket 1 and the bucket cover 2 are both made of salt-resistant stainless steel or engineering plastic, and their inner walls are polished with a surface roughness Ra ≤ 0.8µm.

[0077] The barrel cover 2 has a polytetrafluoroethylene sealing ring 5 embedded in the through hole 203 of its cover 202, which is used to improve the sealing effect between the embolization ball 3 and the through hole 203.

[0078] In addition, the optimized seawater sampling device also includes a ballast weight 6, which is a conical component connected to the center of the spherical bottom of the water sampling bucket 1 by a threaded connection. The weight of the ballast weight 6 is about twice the weight of the water sampling bucket 1, thereby increasing the sinking speed and stability of the device.

[0079] Example 3

[0080] This embodiment provides a further optimized seawater sampling device.

[0081] like Figure 4 , Figure 5 As shown, based on Embodiment 2, this embodiment further adds more functional components, including:

[0082] The water collection bucket 1 is provided with a lower external thread 103 at the bottom of its body. The lower external thread 103 matches the internal thread on the inner wall of the cover 201 of the bucket cover 2. When the device is not in use or the water sample extraction is completed, the bucket cover 2 can be unscrewed from the top of the water collection bucket 1 and then connected to the bottom of the water collection bucket 1 through the lower external thread 103. At this time, the cover 202 of the bucket cover 2 faces downward, and its internal space can just accommodate the weight 6, thus serving as the base of the entire water collection bucket 1, which is convenient for storage and transportation.

[0083] Secondly, a further optimization is the addition of a check cover 7 to the seawater sampling device provided in this embodiment. The check cover 7 is installed on the outside of the seawater inlet / outlet hole 102 of the water sampling bucket 1 via a hinge on its upper part. Its working principle is as follows: when the embolized ball 3 moves upward in the water sampling bucket 1 to discharge the original water in the bucket, the check cover 7 opens outward under the action of the internal water flow, allowing the water to flow out; when the embolized ball 3 continues to move upward and passes through the seawater inlet / outlet hole 102, the external seawater enters the water sampling bucket 1 through the seawater inlet / outlet hole 102; subsequently, when the embolized ball 3 is further lifted and drives the entire water sampling bucket 1 to move upward, the check cover 7 flips downward under the action of the external seawater pressure, sealing the seawater inlet / outlet hole 102, thereby effectively preventing the target depth water sample from being replaced or contaminated by the upper water body during the lifting of the sampling device;

[0084] In addition, the further optimized seawater sampling device is equipped with a carrying mechanism; the carrying mechanism includes a hanging lug 8 and a handle 9. The hanging lug 8 is located on opposite sides of the outer wall of the water sampling bucket 1. The handle 9 has a U-shaped structure, with both ends movably connected to the hanging lug 8. At the top of the U-shape of the handle 9, and on the vertical center line of the water sampling bucket 1, an O-shaped hole 901 is also provided. The lifting cable 4 passes through the O-shaped hole 901, which helps the lifting cable 4 to remain centered during the lifting process and reduces uneven wear.

[0085] In addition, the lifting cable 4 is equipped with a tag 401 indicating its length and is attached with a red float (not shown in the figure) to facilitate observation on the water surface and precise control of the sinking depth of the seawater sampling device.

[0086] In conclusion, it can be seen that:

[0087] This invention comprises a water sampling bucket, a bucket cover, and a plug, forming a novel seawater sampling device. It overcomes the shortcomings of existing technologies by accurately obtaining seawater samples from the ship's centerline, thereby obtaining accurate values ​​of seawater density for calculating the weight of the cargo carried by the ship. This provides a basis for the precise calculation of the cargo weight of the vessel, or for obtaining seawater samples at depths requiring monitoring. Furthermore, the device is simple in structure, easy to manufacture and use, and easy to maintain. Compared to existing technologies, it achieves substantial technical benefits and therefore has significant potential for promotion and application.

[0088] In the description process of the above instruction manual:

[0089] The terms “this embodiment”, “this utility model embodiment”, “as shown”, “further”, etc., are used to indicate that the specific features, structures, materials or characteristics described in the embodiment are included in at least one embodiment of the utility model. In this specification, the illustrative expressions of the above terms are not necessarily directed at the same embodiment. Moreover, the specific features, structures, materials or characteristics described can be combined or combined in a suitable manner in any one or more embodiments.

[0090] Furthermore, without creating contradictions, those skilled in the art can combine or integrate the different embodiments described in this specification and the features of the different embodiments.

[0091] Finally, it should be noted that:

[0092] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions described in the embodiments of this utility model. Non-essential improvements, adjustments or substitutions made by those skilled in the art based on the contents described in this specification are all within the scope of protection claimed by this utility model.

Claims

1. A seawater sampling device for collecting seawater samples to provide parameters for seawater density required for calculating ship carrying capacity or to monitor seawater quality at a certain depth, characterized in that: Includes water collection bucket, bucket mask, embolization ball, and lifting cable; The water collection bucket has a cylindrical body and a hemispherical bottom. The outer edge of the upper opening is provided with an upper external thread, and the upper cylindrical wall of the water collection bucket is also provided with multiple seawater inlet and outlet holes. The barrel cover consists of a cylindrical cover and a hemispherical cover. The cover is connected to the cylindrical cover and can accommodate the plug ball. A through hole is cut at the top of the cover. The inner wall of the cylindrical cover is provided with an internal thread that matches the external thread of the upper part of the water collection barrel. The barrel cover can be threaded to the upper part of the water collection barrel. The top of the embolizing ball is connected to the lifting cable, and when the lifting cable is pulled up, it forms a piston-like component by cooperating with the inner wall of the water collection bucket. The ball enters the cover of the bucket cover from the bottom of the water collection bucket through the seawater inlet and outlet hole and partially exits through the through hole, thereby plugging the through hole.

2. The seawater sampling device according to claim 1, characterized in that: The inner contour of the hemispherical bottom of the water collection bucket is adapted to the lower contour of the embolization ball to form a continuous sealing surface.

3. The seawater sampling device according to claim 1, characterized in that: The seawater inlet and outlet holes are rectangular and are evenly distributed on the upper wall of the water collection bucket, with a number of 4 to 8. The distance between the lower edge of the seawater inlet and outlet hole and the upper port of the water collection bucket is 1 / 5 to 1 / 4 of the total height of the water collection bucket.

4. The seawater sampling device according to claim 1, characterized in that: The water collection bucket and the bucket cover are made of salt-resistant stainless steel or engineering plastic, respectively, and their inner walls are polished with a surface roughness of Ra≤0.8µm. The embolization ball is a solid or hollow ball, and is made of polytetrafluoroethylene material or has a polytetrafluoroethylene coating on its surface; The barrel-shaped mask also has a sealing ring embedded in the through hole of the cover.

5. The seawater sampling device according to claim 1, characterized in that: It also includes a counterweight, which is located at the center of the spherical bottom of the water collection tank.

6. The seawater sampling device according to claim 5, characterized in that: The counterweight is a conical component, which is connected to the center of the spherical bottom of the water collection bucket by means of threaded connection or welding, and the weight of the counterweight is 1 to 3 times the weight of the water collection bucket itself.

7. The seawater sampling device according to claim 6, characterized in that: The water collection bucket has a lower external thread at the bottom of its body that matches the internal thread of the cover. The cover can be threaded to the bottom of the water collection bucket and enclose the counterweight to become the base of the water collection bucket.

8. The seawater sampling device according to claim 1, characterized in that: It also includes a check valve, which is mounted on the outside of the seawater inlet / outlet of the water collection tank via a hinge on its upper part; When the seawater in the water sampling bucket is discharged by the embolism ball moving upward, the seawater is opened. When the embolism ball continues to move upward and passes through the seawater inlet and outlet hole, the seawater enters the water sampling bucket through the seawater inlet and outlet hole. As the embolism ball continues to be lifted and drives the water sampling bucket to move upward, the check valve is pressed and sealed by the seawater inlet and outlet hole under the action of the seawater on the outside.

9. The seawater sampling device according to claim 1, characterized in that: It also includes a carrying mechanism, which includes a hook and a handle. The hook is provided on opposite sides of the outer wall of the water collection bucket. The hook is used to movably connect the handle. The handle is U-shaped, and an O-shaped hole is provided at the top of the U-shape of the handle and on the vertical center line of the water collection bucket. The lifting cable passes through the O-shaped hole.

10. The seawater sampling device according to claim 1, characterized in that: The lifting cable is also equipped with a label indicating its length and a float, which is red.

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