Filtering and sampling device for marine environment monitoring

Abstract

The invention relates to the technical field of seawater sampling, and provides a filtering and sampling device for marine environment monitoring, which comprises a tube shell, a rotating sleeve, a first filtering part, a second filtering part, a third filtering part, a compression part and a driving module, a first containing opening, a second containing opening, a third containing opening, a first sealing cavity and a second sealing cavity which are communicated with one another are formed in the pipe body, and the first filtering piece, the second filtering piece and the third filtering piece respectively comprise a first filtering net, a second filtering net and a third filtering net. The compression component comprises a first compression plug and a second compression plug which are slidably connected in the first sealing cavity and the second sealing cavity respectively, and the driving module is in transmission connection with the rotating sleeve and the compression component, so that classified filtration or classified sampling of particulate matters can be realized, and the particulate matters in the first filter screen, the second filter screen and the third filter screen can be conveniently and directly detected; the device has the characteristics of automatic classified sampling and convenience in detection of particulate matters subjected to classified sampling.

Description

Technical Field

[0001] The present invention relates to the technical field of seawater sampling, and more particularly to a filtering sampling device for marine environmental monitoring. Background Art

[0002] A distribution box is usually a small electrical equipment box used to distribute electricity to various circuits. It generally includes circuit breakers, fuses, terminal blocks, etc., and is mainly used for low-voltage power distribution and control. When welding the outer box body of the distribution box, generally, the sheet metal is first bent, and then the upper cover plate and the lower cover plate are pre-installed at both ends of the bent sheet metal to form a frame. Finally, the welding equipment welds the diagonal splicing seams on the front side of the box frame, the splicing seams of the upper cover plate and the lower cover plate, and the limiting ribs or power racks on the inner wall of the box frame.

[0003] After retrieval, the existing patent number CN118067446B discloses a filtering sampling device for marine environmental monitoring, including: a sampling sleeve box; the sampling sleeve box is a cuboid box-shaped structure that penetrates from left to right. A collection box is vertically butted at the lower end of the sampling sleeve box. An inlet water pipe box is vertically butted at the position corresponding to the collection box above the sampling sleeve box. The inner cavities of the inlet water pipe box, the sampling sleeve box, and the collection box are in a through-connection structure. A filtering box is slidably arranged in the inner cavity of the sampling sleeve box. The upper end of the filtering box is an open end, and the four side walls of the filtering box are slidably tangent to the four side walls of the inner cavity of the sampling sleeve box. This technical solution can achieve that when the filtering box is placed inside the sampling sleeve box, the self-unloading door is closed, and when the filtering box pops out, the self-unloading door can automatically open, and the floating debris collected inside can automatically slide out, achieving the effect of automatic cleaning after sampling, which is convenient and fast.

[0004] Since the types of solid particles or suspended matters in the ocean are relatively diverse, only by filtering and sampling separately according to the size of the particles can the content or distribution information of different types of particles be accurately detected. However, the filtering box in the above technical solution cannot filter and sample separately according to the size of different particles. Although the application of using multiple layers or spatially distributed filter meshes or filter membranes to separately filter and sample particles of different sizes in the prior art is relatively mature, when detecting and analyzing the particles, it is still necessary to take out the filter mesh from the sealed sampling equipment or sample layer by layer with tweezers, and the operation process is rather cumbersome and inconvenient. Summary of the Invention

[0005] The purpose of the present invention is to provide a filtering sampling device for marine environmental monitoring, aiming to solve the problems existing in the existing filtering sampling devices for marine environmental monitoring.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A filtering sampling device for marine environmental monitoring, including:

[0007] A tube shell, the tube shell comprising a tube body, wherein a first receiving port, a second receiving port, a third receiving port, a first sealed cavity and a second sealed cavity are arranged in the tube body, and a liquid outlet cannula is fixedly connected to an end of the second receiving port;

[0008] A rotating sleeve movably sleeved on the surface of the tube body, wherein the surface of the rotating sleeve is provided with a detection port;

[0009] A first filter element, a second filter element and a third filter element are respectively arranged in the first accommodating opening, the second accommodating opening and the third accommodating opening, wherein the first filter element, the second filter element and the third filter element respectively include a first filter screen, a second filter screen and a third filter screen;

[0010] A compression component, the compression component comprising a first compression plug and a second compression plug slidably connected in the first sealing cavity and the second sealing cavity respectively;

[0011] A driving module transmission-connected to the rotating sleeve and the compression component, when the first compression plug is close to the liquid outlet cannula, the distances between the first filter element, the second filter element and the third filter element and the axis of the tube body are consistent, and when the first compression plug is away from the liquid outlet cannula, the distance between the first filter element and the axis of the tube body is greater than the distance between the second filter element and the axis of the tube body, and the distance between the second filter element and the axis of the tube body is greater than the distance between the third filter element and the axis of the tube body.

[0012] As a further solution of the present invention, a liquid guide hole is arranged between the first accommodating port, the second accommodating port and the third accommodating port, a medium through hole is arranged between the first sealed cavity, the second accommodating port and the third accommodating port, a liquid inlet channel is arranged between the third accommodating port and the second sealed cavity, the distance between the liquid guide hole and the axis of the tube body is greater than the distance between the medium through hole and the axis of the tube body, the liquid guide hole between the first accommodating port and the second accommodating port is distributed obliquely above the liquid guide hole between the second accommodating port and the third accommodating port, the liquid guide hole between the second accommodating port and the third accommodating port is distributed obliquely above the liquid inlet channel, and the medium through hole between the first sealed cavity and the second accommodating port is distributed obliquely above the medium through hole between the second accommodating port and the third accommodating port.

[0013] The beneficial effects of the present invention are as follows: when the first filter, the second filter and the third filter are controlled to be distributed in a stepped manner, graded filtration or graded sampling of particulate matter can be performed when sampling seawater; when the first filter, the second filter and the third filter are controlled to be in the same plane, not only can the seawater be transported to multiple groups of liquid sampling tubes, but the particulate matter in the first filter, the second filter and the third filter can also be directly detected, and the present invention has the characteristics of automatic classification sampling and convenience for detecting the particulate matter after classification sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a first stereogram of the present invention.

[0015] Figure 2 This is an exploded view of the present invention.

[0016] Figure 3 This is a schematic diagram of the disassembly of the shell of the embodiment of the present invention.

[0017] Figure 4 This is a plan sectional view of the tube body of the embodiment of the present invention.

[0018] Figure 5 This is a perspective view of the rotating sleeve of the embodiment of the present invention.

[0019] Figure 6 This is a perspective view of the first filter element of the embodiment of the present invention.

[0020] Figure 7 This is a perspective view of the second filter element of the embodiment of the present invention.

[0021] Figure 8 This is a perspective view of the third filter element of the embodiment of the present invention.

[0022] Figure 9 This is a schematic diagram of the disassembly of the drive module of the embodiment of the present invention.

[0023] Figure 10 This is a perspective view of the compression component of the embodiment of the present invention.

[0024] Figure 11 This is a partial sectional view of the present invention.

[0025] Figure 12 This is the present invention Figure 11 A partial enlarged view at position a in the present invention.

[0026] Figure 13 This is the first plan sectional view of the present invention.

[0027] Figure 14 This is the second perspective view of the present invention.

[0028] Figure 15 This is the second plan sectional view of the present invention.

[0029] Reference numerals: 1 - shell, 11 - tube body, 111 - sinking groove, 1111 - first receiving port, 1112 - second receiving port, 1113 - third receiving port, 112 - liquid guiding hole, 113 - medium through hole, 114 - first sealing cavity, 115 - second sealing cavity, 116 - liquid inlet channel, 117 - sampling cavity, 118 - liquid outlet insertion tube, 119 - limiting end cover, 12 - sealing cover; 2 - rotating sleeve, 21 - gear ring, 22 - mesh cover, 23 - detection port;

[0030] 3 - First filter element, 31 - First piston housing, 32 - First filter screen, 33 - First liquid outlet;

[0031] 4 - Second filter element, 41 - Second piston housing, 42 - Second filter screen, 43 - Second liquid outlet, 44 - First sealing plug, 45 - First limiting rod, 46 - First return spring, 47 - First separating pin;

[0032] 5 - Third filter element, 51 - Third piston housing, 52 - Third filter screen, 53 - Third liquid outlet, 54 - Second sealing plug, 55 - Second limiting rod, 56 - Second return spring, 57 - Second separating pin;

[0033] 6 - Driving module, 61 - Driving part, 611 - Driving motor, 612 - Driving rod, 613 - Driving gear, 614 - Magnetic ring, 62 - Magneto - control part, 621 - Electromagnet, 622 - Third return spring, 623 - Bracket;

[0034] 7 - Compression component, 71 - Threaded rod, 72 - Transmission gear, 73 - First compression plug, 74 - Second compression plug, 75 - Fixed rod; 8 - Liquid sampling tube, 9 - Power supply module, 10 - Skeleton. Specific embodiments

[0035] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following further elaborates on the present invention in combination with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0036] The following describes the specific implementation of the present invention in detail in combination with specific embodiments.

[0037] Please refer to Figures 1 to 15 , in an embodiment of the present invention, a filtering and sampling device for marine environment monitoring includes:

[0038] A tube housing 1, the tube housing 1 includes a tube body 11, a sunk groove 111 is arranged on the surface of the tube body 11, and a first accommodation port 1111, a second accommodation port 1112, a third accommodation port 1113, a first sealing cavity 114 and a second sealing cavity 115 that are interconnected are arranged in the sunk groove 111. An outlet liquid insertion tube 118 is fixedly connected to the end of the second accommodation port 1112;

[0039] A rotating sleeve 2 movably sleeved on the surface of the tube body 11, and a detection port 23 is arranged on the surface of the rotating sleeve 2;

[0040] The first filter element 3, the second filter element 4 and the third filter element 5 are respectively arranged in the first accommodating opening 1111, the second accommodating opening 1112 and the third accommodating opening 1113, wherein the first filter element 3, the second filter element 4 and the third filter element 5 respectively include a first filter screen 32, a second filter screen 42 and a third filter screen 52;

[0041] A compression component 7, the compression component 7 comprises a first compression plug 73 and a second compression plug 74 respectively slidably connected in the first sealing cavity 114 and the second sealing cavity 115;

[0042] The driving module 6 is transmission-connected to the rotating sleeve 2 and the compression component 7. When the first compression plug 73 is close to the liquid outlet cannula 118, the distances between the first filter element 3, the second filter element 4 and the third filter element 5 and the axis of the tube body 11 are consistent. When the first compression is away from the liquid outlet cannula 118, the distance between the first filter element 3 and the axis of the tube body 11 is greater than the distance between the second filter element 4 and the axis of the tube body 11, and the distance between the second filter element 4 and the axis of the tube body 11 is greater than the distance between the third filter element 5 and the axis of the tube body 11.

[0043] See also Figure 5 Furthermore, the rotating sleeve 2 also includes a gear ring 21 and a mesh cover 22. The gear ring 21 is arranged at the end of the rotating sleeve 2, and the mesh cover 22 is arranged on the surface of the rotating sleeve 2.

[0044] See also Figure 10 and Figure 13 Furthermore, the compression component 7 also includes a threaded rod 71, a transmission gear 72 and a fixing rod 75, the fixing rod 75 is fixedly connected between the first compression plug 73 and the second compression plug 74, the threaded rod 71 is connected in the first sealing cavity 114, the transmission gear 72 is fixedly connected to the threaded rod 71, and the second compression plug 74 is threadedly connected to the threaded rod 71.

[0045] See also Figure 9 and Figure 12 Further, the driving module 6 includes a driving part 61 and a magneto-control part 62, the driving part 61 includes a driving motor 611, a driving rod 612, a driving gear 613 and a magnetic ring 614, the driving motor 611 is connected to the driving rod 612, the driving gear 613 is connected to the surface of the driving rod 612, the surface of the driving gear 613 is inlaid with a magnetic ring 614, the ring gear 21 and the transmission gear 72 are both transmission-connected to the driving gear 613, the magneto-control part 62 includes an electromagnet 621, a third reset spring 622 and a bracket 623, the electromagnet 621 is fixedly connected to the bracket 623, the third reset spring 622 is connected between the driving gear 613 and the bracket 623, and the bracket 623 is fixedly connected to the driving motor 611.

[0046] Please refer to Figure 3 and Figure 13 Furthermore, one end of the tube body 11 is provided with a sampling cavity 117, the liquid outlet insertion tube 118 is distributed in the sampling cavity 117, the other end of the tube body 11 is fixedly connected with a limiting end cover 119, the driving motor 611 is fixedly connected with the limiting end cover 119, and the end of the rotating sleeve 2 is in sliding contact with the limiting end cover 119.

[0047] Please refer to Figure 3 and Figure 13 Furthermore, it further includes a power module 9 and a skeleton 10. The tube body 11 is sleeved in the mounting hole on the surface of the skeleton 10. When detection is required, it can be directly connected to the skeleton 10 and put into the particulate matter detection instrument together to detect the particulate matter in the first filter screen 32, the second filter screen 42 and the third filter screen 52. It can also be taken out from the mounting hole for detection. The power module 9 is installed in the power supply slot at the end of the tube body 11. The end of the tube body 11 is threadedly connected with a sealing cover 12, and the sealing cover 12 is used to seal the power supply slot and the sampling cavity 117. Before sampling, it is necessary to put the liquid sampling tube 8 into the sampling cavity 117, or insert the liquid outlet insertion tube 118 into the liquid sampling tube 8.

[0048] In the embodiment of the present invention, a liquid guiding hole 112 is provided between the first accommodating port 1111, the second accommodating port 1112 and the third accommodating port 1113, a medium through hole 113 is provided between the first sealing cavity 114, the second accommodating port 1112 and the third accommodating port 1113, a liquid inlet channel 116 is provided between the third accommodating port 1113 and the second sealing cavity 115. The distance between the liquid guiding hole 112 and the axis of the tube body 11 is greater than the distance between the medium through hole 113 and the axis of the tube body 11. The liquid guiding hole 112 between the first accommodating port 1111 and the second accommodating port 1112 is distributed obliquely above the liquid guiding hole 112 between the second accommodating port 1112 and the third accommodating port 1113. The liquid guiding hole 112 between the second accommodating port 1112 and the third accommodating port 1113 is distributed obliquely above the liquid inlet channel 116. The medium through hole 113 between the first sealing cavity 114 and the second accommodating port 1112 is distributed obliquely above the medium through hole 113 between the second accommodating port 1112 and the third accommodating port 1113.

[0049] Please refer to Figure 6 and Figure 13 In an embodiment of the present invention, the first filter element 3 further includes a first piston shell 31 and a first liquid outlet 33. The first filter element 3 is embedded in the inner wall of the first piston shell 31. The side wall of the first piston shell 31 is provided with the first liquid outlet 33. The first piston shell 31 is in sliding contact with the inner wall of the first accommodating port 1111.

[0050] Please refer to Figure 7 and Figure 13, Further, the second filter element 4 further includes a second piston housing 41, a second liquid outlet 43, a first sealing plug 44, a first limiting rod 45, a first return spring 46 and a first separating pin 47. The second filter element 4 is embedded in the inner wall of the second piston housing 41. The side wall of the second piston housing 41 is provided with the second liquid outlet 43. The first separating pin 47 is fixedly connected between the second piston housing 41 and the first sealing plug 44. The first limiting rod 45 is fixedly connected to the side of the first sealing plug 44 facing away from the first separating pin 47. The first return spring 46 is connected between the first sealing plug 44 and the second receiving port 1112. Both the second piston housing 41 and the first sealing plug 44 are in sliding contact with the inner wall of the second receiving port 1112.

[0051] Please refer to Figure 8 and Figure 13 , Further, the third filter element 5 includes a third piston housing 51, a third liquid outlet 53, a second sealing plug 54, a second limiting rod 55, a second return spring 56 and a second separating pin 57. The third filter element 5 is embedded in the inner wall of the third piston housing 51. The side wall of the third piston housing 51 is provided with the third liquid outlet 53. The second separating pin 57 is fixedly connected between the third piston housing 51 and the second sealing plug 54. The second limiting rod 55 is fixedly connected to the side of the second sealing plug 54 facing away from the second limiting rod 55. The second return spring 56 is connected between the second sealing plug 54 and the third receiving port 1113. Both the third piston housing 51 and the second sealing plug 54 are in sliding contact with the inner wall of the third receiving port 1113.

[0052] In the embodiment of the present invention, the depths of the second receiving port 1112 and the third receiving port 1113 are the same, and the depth of the first receiving port 1111 is less than the depth of the second receiving port 1112. The device includes the following two operating modes:

[0053] Please refer to Figure 12 and Figure 13, Filter sampling mode: First, control the electromagnet 621 to be energized. After being energized, the electromagnet 621 magnetically adheres to the magnetic ring 614, the driving gear 613 is in transmission connection with the transmission gear 72, and the driving motor 611 controls the threaded rod 71 to rotate clockwise through the driving rod 612, the driving gear 613, and the transmission gear 72. The clockwise rotating threaded rod 71 controls the movement of the second compression plug 74 and the first compression plug 73. The moving second compression plug 74 sucks the medium inside the second receiving port 1112 and the third receiving port 1113 (below the first sealing plug 44 and the second sealing plug 54) into the first sealing cavity 114, so as to drive the first filter element 3 and the second filter element 4 to move radially. Since in the initial state, the second sealing plug 54 blocks the liquid inlet passage 116, and one-way valves are provided inside both the liquid inlet passage 116 and the liquid outlet insertion tube 118, the second sealing cavity 115 is always in an approximately vacuum state. Therefore, when the first compression plug 73 moves inside the second sealing cavity 115, it can reserve storage space for the filtered liquid;

[0054] Since the depths of the second receiving port 1112 and the third receiving port 1113 are the same, the first filter element 3 is fixedly sleeved inside the first receiving port 1111. The depth of the first receiving port 1111 is less than the depth of the second receiving port 1112. The length of the first limiting rod 45 is greater than the length of the second limiting rod 55. The sizes of the first piston housing 31, the second piston housing 41, and the third piston housing 51 are the same. Therefore, the first filter screen 32, the second filter screen 42, and the third filter screen 52 are distributed in a stepped manner. When seawater is filtered by the first filter screen 32 and enters the first piston housing 31, then it enters the second filter screen 42 through the first liquid outlet 33 and the liquid guiding hole 112 for filtration, and then enters the third filter screen 52 through the second piston housing 41, the second liquid outlet 43, and the liquid guiding hole 112 for filtration. Finally, it enters the second sealing cavity 115 through the third piston housing 51, the third liquid outlet 53, and the liquid inlet passage 116;

[0055] Please refer to Figure 12 and Figure 15 , Sampling and detection mode: First, use the driving module 6 to control the second compression plug 74 and the first compression plug 73 to move in the reverse direction. After the reversely moving second compression plug 74 compresses the medium into the second receiving port 1112 and the third receiving port 1113, it cooperates with the elastic forces of the first return spring 46 and the second return spring 56 to drive the second filter element 4 and the third filter element 5 to move in the reverse direction. Since the diameters of the ends of the first receiving port 1111, the second receiving port 1112, and the third receiving port 1113 are smaller than the diameters inside, a limiting effect can be achieved. At this time, the first filter element 3, the second filter element 4, and the third filter element 5 are in the same plane (the plane where the bottom of the sinking groove 111 is located). The reversely moving first compression plug 73 is used to compress the liquid in the second sealing cavity 115 into the liquid sampling tube 8 through the liquid outlet insertion tube 118.

[0056] Working principle: First, the first filter screen 32, the second filter screen 42, and the third filter screen 52 are arranged in a stepped manner by using the operation method of the filtering and sampling mode. Then, the device is sent into the seawater to a certain depth by using a winch or a cable. Since the rotating sleeve 2 is used to seal the three groups of receiving ports on the surface of the pipe body 11 in the initial state, after the device reaches the designated position, the electromagnet 621 is controlled to power off. After the powered-off electromagnet 621 loses the magnetic attraction to the magnetic ring 614, the elastic force of the third return spring 622 drives the driving gear 613 to move along the driving rod 612 to a position in contact with the end of the pipe body 11. At this time, the driving gear 613 is in transmission connection with the toothed ring 21, and the driving motor 611 controls the rotating sleeve 2 to rotate to a position where the mesh cover 22 is aligned with the first receiving port 1111 through the driving rod 612, the driving gear 613, and the toothed ring 21. The mesh cover 22 is used to prevent large-volume sundries such as seaweeds and garbage from entering the first receiving port 1111. After the seawater filtered by the first filter screen 32, the second filter screen 42, and the third filter screen 52 enters the second sealing cavity 115, the rotating sleeve 2 is again controlled by the driving module 6 to seal the three groups of receiving ports. When the device is lifted into the ship's hull by using a winch or a cable, or when the sample needs to be detected, first, the driving module 6 is used to control the detection port 23 on the surface of the rotating sleeve 2 to be aligned with the three groups of receiving ports. Then, when the first filter screen 32, the second filter screen 42, and the third filter screen 52 are in the same plane by using the operation method of the sampling and detection mode, the liquid in the second sealing cavity 115 is automatically compressed into the liquid sampling tube 8 through the liquid outlet insertion tube 118. When the liquid sampling tube 8 is taken out for liquid detection, since the first filter screen 32, the second filter screen 42, and the third filter screen 52 are in the same plane, not only can the device be directly placed into the solid particle detection instrument for detection, but it is also convenient to use sampling tools such as tweezers to sample the solid samples in the three groups of filter screens.

[0057] In summary, when the present application controls the first filter screen 32, the second filter screen 42, and the third filter screen 52 to be arranged in a stepped manner, it can perform hierarchical filtration or hierarchical sampling of particulate matter during seawater sampling. When the first filter screen 32, the second filter screen 42, and the third filter screen 52 are in the same plane, it can not only transport seawater into multiple groups of liquid sampling tubes 8, but also facilitate the direct detection of the particulate matter in the first filter screen 32, the second filter screen 42, and the third filter screen 52, having the characteristics of automatic classification sampling and facilitating the detection of the particulate matter after classification sampling.

[0058] For those skilled in the art, although several embodiments and examples of the present invention are described, these embodiments and examples are presented as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in various other ways, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. These embodiments and their variations are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and its equivalents.

[0059] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A filtering and sampling device for marine environment monitoring, characterized in that, include: A tube shell (1), the tube shell (1) comprising a tube body (11), the tube body (11) being provided with a first receiving opening (1111), a second receiving opening (1112), a third receiving opening (1113), a first sealed cavity (114) and a second sealed cavity (115) interconnected with each other, the end of the second receiving opening (1112) being fixedly connected with a liquid outlet cannula (118); A rotating sleeve (2) movably sleeved on the surface of the tube body (11); A first filter element (3), a second filter element (4) and a third filter element (5) are respectively arranged in the first accommodating opening (1111), the second accommodating opening (1112) and the third accommodating opening (1113), wherein the first filter element (3), the second filter element (4) and the third filter element (5) respectively comprise a first filter screen (32), a second filter screen (42) and a third filter screen (52); A compression component (7), the compression component (7) comprising a first compression plug (73) and a second compression plug (74) respectively slidably connected in the first sealing cavity (114) and the second sealing cavity (115); A driving module (6) is connected to the rotating sleeve (2) and the compression component (7) in a transmission manner. When the first compression plug (73) is close to the liquid outlet plug (118), the distances between the first filter element (3), the second filter element (4) and the third filter element (5) and the axis of the tube body (11) are consistent. When the first compression plug is away from the liquid outlet plug (118), the distance between the first filter element (3) and the axis of the tube body (11) is greater than the distance between the second filter element (4) and the axis of the tube body (11), and the distance between the second filter element (4) and the axis of the tube body (11) is greater than the distance between the third filter element (5) and the axis of the tube body (11).

2. The filtering and sampling device for marine environment monitoring according to claim 1, characterized in that, A liquid guide hole (112) is provided between the first accommodating opening (1111), the second accommodating opening (1112) and the third accommodating opening (1113); a medium through hole (113) is provided between the first sealed cavity (114), the second accommodating opening (1112) and the third accommodating opening (1113); a liquid inlet channel (116) is provided between the third accommodating opening (1113) and the second sealed cavity (115); the liquid guide hole (112) is connected to the tube body (114); The distance between the axes is greater than the distance between the medium through hole (113) and the axis of the tube body (11); the liquid guide hole (112) between the first receiving opening (1111) and the second receiving opening (1112) is distributed obliquely above the liquid guide hole (112) between the second receiving opening (1112) and the third receiving opening (1113); and the liquid guide hole (112) between the second receiving opening (1112) and the third receiving opening (1113) is distributed obliquely above the liquid inlet channel (116); The medium through hole (113) between the first sealed cavity (114) and the second accommodating opening (1112) is distributed obliquely above the medium through hole (113) between the second accommodating opening (1112) and the third accommodating opening (1113).

3. The filtering and sampling device for marine environment monitoring according to claim 2, characterized in that, The first filter element (3) further comprises a first piston shell (31) and a first liquid outlet (33); the first filter element (3) is embedded in the inner wall of the first piston shell (31); the first liquid outlet (33) is provided on the side wall of the first piston shell (31); the first piston shell (31) is in sliding contact with the inner wall of the first accommodating port (1111).

4. The filtering and sampling device for marine environment monitoring according to claim 3, characterized in that, The second filter element (4) also includes a second piston shell (41), a second liquid outlet (43), a first sealing plug (44), a first limiting rod (45), a first return spring (46) and a first partition pin (47); the second filter element (4) is embedded in the inner wall of the second piston shell (41); the side wall of the second piston shell (41) is provided with a second liquid outlet (43); the first partition pin (47) is fixedly connected between the second piston shell (41) and the first sealing plug (44); the first limiting rod (45) is fixedly connected to the side of the first sealing plug (44) away from the first partition pin (47); the first return spring (46) is connected between the first sealing plug (44) and the second accommodating port (1112); the second piston shell (41) and the first sealing plug (44) are both in sliding contact with the inner wall of the second accommodating port (1112).

5. The filtering and sampling device for marine environment monitoring according to claim 4, wherein, The third filter element (5) comprises a third piston shell (51), a third liquid outlet (53), a second sealing plug (54), a second limiting rod (55), a second return spring (56) and a second partition pin (57); the third filter element (5) is embedded in the inner wall of the third piston shell (51); the side wall of the third piston shell (51) is provided with a third liquid outlet (53); the second partition pin (57) is fixedly connected between the third piston shell (51) and the second sealing plug (54); the second limiting rod (55) is fixedly connected to the side of the second sealing plug (54) away from the second limiting rod (55); the second return spring (56) is connected between the second sealing plug (54) and the third accommodating port (1113); the third piston shell (51) and the second sealing plug (54) are both in sliding contact with the inner wall of the third accommodating port (1113).

6. The filtering and sampling device for marine environment monitoring according to claim 1, wherein, The depths of the second accommodating opening (1112) and the third accommodating opening (1113) are consistent, and the depth of the first accommodating opening (1111) is smaller than the depth of the second accommodating opening (1112).

7. The filtering and sampling device for marine environment monitoring according to claim 1, characterized in that, The rotating sleeve (2) further comprises a gear ring (21) and a mesh cover (22); the gear ring (21) is arranged at the end of the rotating sleeve (2); and the mesh cover (22) is arranged on the surface of the rotating sleeve (2).

8. The filtering and sampling device for marine environment monitoring according to claim 7, characterized in that, The compression component (7) further comprises a threaded rod (71), a transmission gear (72) and a fixing rod (75); the fixing rod (75) is fixedly connected between the first compression plug (73) and the second compression plug (74); the threaded rod (71) is connected in the first sealing cavity (114); the transmission gear (72) is fixedly connected to the threaded rod (71); and the second compression plug (74) is threadedly connected to the threaded rod (71).

9. The filtering and sampling device for marine environment monitoring according to claim 8, characterized in that, The driving module (6) includes a driving part (61) and a magnetic control part (62). The driving part (61) includes a driving motor (611), a driving rod (612), a driving gear (613) and a magnetic ring (614). The driving motor (611) is connected to the driving rod (612). The driving gear (613) is connected to the surface of the driving rod (612). The magnetic ring (614) is embedded in the surface of the driving gear (613). The toothed ring (21) and the transmission gear (72) are both in transmission connection with the driving gear (613). The magnetic control part (62) includes an electromagnet (621), a third return spring (622) and a bracket (623). The electromagnet (621) is fixedly connected to the bracket (623). The third return spring (622) is connected between the driving gear (613) and the bracket (623). The bracket (623) is fixedly connected to the driving motor (611).

10. The filtering and sampling device for marine environment monitoring according to claim 9, characterized in that, One end of the pipe body (11) is provided with a sampling cavity (117). The liquid outlet insertion tube (118) is distributed in the sampling cavity (117). The other end of the pipe body (11) is fixedly connected with a limit end cover (119). The driving motor (611) is fixedly connected with the limit end cover (119). The end of the rotating sleeve (2) is in sliding contact with the limit end cover (119).

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