Anaerobic reactor multilayer sludge sampling device

Abstract

The utility model relates to sludge sampling device technical field discloses a kind of multilayer sludge sampling devices of anaerobic reactor, including anaerobic reactor main part and vacuum air pump installed in the side surface of anaerobic reactor main part, the inside fixed mounting of anaerobic reactor main part has sampling isolation plate.The utility model, by being equipped with isolation sampling cavity, play vacuum oxygen isolation effect, sampling plug-in pipe is sequentially penetrated two isolation sampling plates, extends to anaerobic reaction cavity, carries out multilayer stable sampling, sampling air tightness is excellent, sampling plug-in pipe can be opened and closed sampling switch piece when sampling and closure respectively, it is convenient to carry out multilayer sealed sampling, sealing switch piece plays sealing closing cooperation effect, and two isolation sampling plates can be synchronously rotated adjustment, it is convenient to multipoint sampling, make device oxygen multilayer sampling capacity better, sealing sampling capacity is excellent, and it is convenient to carry out multilayer rapid collection sampling, sampling is simple and convenient, and sampling accuracy is high.

Description

Technical Field

[0001] This utility model relates to the technical field of sludge sampling devices, and in particular to a multi-layer sludge sampling device for an anaerobic reactor. Background Technology

[0002] An anaerobic reactor is an environmentally friendly device that utilizes anaerobic microorganisms to decompose organic pollutants in an oxygen-free environment. It is widely used in the treatment of organic wastewater from industries and domestic sewage. Its core reaction process relies on the metabolic activities of anaerobic microorganisms in the sludge within the reactor to degrade pollutants. Because sludge at different depths within an anaerobic reactor exhibits significant differences in microbial community structure, organic matter concentration, and reaction progress, these differences directly affect the reactor's treatment efficiency, operational stability, and process optimization. Therefore, it is necessary to stratify and sample sludge from different depths. Analyzing the sample data allows for understanding the internal reaction state of the reactor, providing a scientific basis for process adjustment, troubleshooting, and performance optimization.

[0003] In existing technologies, there is a lack of dedicated equipment for multi-layer sampling of sludge from anaerobic reactors. Traditional sampling methods require stopping the reactor operation before opening the sealed cover on the top or side wall of the reactor for sampling. The normal operation of an anaerobic reactor depends on a strictly anaerobic environment. During shutdown and opening of the cover, air directly enters the reactor, which not only disrupts the anaerobic atmosphere of the sludge and inhibits the activity of anaerobic microorganisms, but may even cause the death of some microorganisms, thus affecting the recovery of subsequent treatment efficiency. Sealed-cover sampling is inconvenient, lacks rapid multi-layer anaerobic sampling capabilities, has poor sealing, and is difficult to perform quickly and conveniently. After opening the cover, the sludge layer inside the reactor is easily mixed due to external airflow and operational disturbances, making the sample unable to accurately reflect the original state of the sludge at the corresponding depth. This results in a significant reduction in sampling accuracy, making it difficult to meet the data accuracy requirements for reactor operation monitoring and process optimization. Therefore, we propose a multi-layer sludge sampling device for anaerobic reactors to solve the above problems. Utility Model Content

[0004] To address the aforementioned problems, this invention provides a multi-layer sludge sampling device for anaerobic reactors.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A multi-layer sludge sampling device for an anaerobic reactor includes an anaerobic reactor body and a vacuum pump installed on the side of the anaerobic reactor body. A sampling isolation plate is fixedly installed inside the anaerobic reactor body. The interior of the anaerobic reactor body is divided into an anaerobic reaction chamber and an isolation sampling chamber by a sampling isolation plate. The output end of the vacuum pump is connected to the isolation sampling chamber. Isolation sampling plates are rotatably connected to the top of both the sampling isolation plate and the anaerobic reactor body. Sampling insertion pipes are inserted and installed on the two isolation sampling plates. Sealing switch components corresponding to the positions of the sampling insertion pipes are provided at the bottom of both isolation sampling plates. Sampling switch components are provided at the bottom of the sampling insertion pipes.

[0006] Preferably, a pressure monitor is provided inside the isolation sampling chamber, and a switch controller is provided on the top of the anaerobic reactor body. The switch controller is electrically connected to the vacuum pump, the pressure monitor, the sealing switch and the sampling switch respectively.

[0007] Preferably, the anaerobic reaction chamber is located directly below the isolation sampling chamber, the bottom of the sampling insertion tube passes through the isolation sampling chamber and connects to the anaerobic reaction chamber, the bottom of the anaerobic reactor body is provided with a discharge pipe, the side of the anaerobic reactor body is provided with a feed pipe, both the discharge pipe and the feed pipe are connected to the anaerobic reaction chamber, and both the discharge pipe and the feed pipe are provided with control valves.

[0008] Preferably, a rotating sealing ring is rotatably connected to the outer side of the isolation sampling plate, and the two rotating sealing rings are respectively embedded in the top of the anaerobic reactor body and the middle of the sampling isolation plate.

[0009] Preferably, both isolation sampling plates are embedded with sealing mounting rings, and the sampling insertion tube is sequentially inserted into the two sealing mounting rings, and the sampling insertion tube is sealed to the isolation sampling plate by the sealing mounting rings.

[0010] Preferably, a synchronous moving plate is fixedly installed between the two isolation sampling plates, and a moving handle is provided on the top of the top isolation sampling plate.

[0011] Preferably, the sealing switch includes a hinged sealing plate and a movement control cylinder. The two hinged sealing plates are respectively hinged to the bottom of the two isolation sampling plates and are respectively located at the top of the anaerobic reaction chamber and the isolation sampling chamber. The two ends of the movement control cylinder are respectively hinged to the bottom of the hinged sealing plate and the isolation sampling plate. Both hinged sealing plates correspond to the position of the sampling insertion pipe.

[0012] Preferably, the sampling switch includes an annular cover, a miniature waterproof cylinder, and a sealing connecting ring. The annular cover is hinged to the bottom of the inner side of the sampling insertion tube. The two ends of the miniature waterproof cylinder are respectively hinged to the inner side of the sampling insertion tube and the top edge of the annular cover. The sealing connecting ring is sleeved and sealed at the edge of the annular cover. The sealing connecting ring matches the bottom of the inner side of the sampling insertion tube.

[0013] Compared with the prior art, the advantages and positive effects of this utility model are as follows: 1. This multi-layer sludge sampling device for an anaerobic reactor is divided into an anaerobic reaction chamber and an isolation sampling chamber by a sampling isolation plate inside the anaerobic reactor body. The anaerobic reaction treatment and vacuum oxygen isolation are performed separately. The sampling isolation plate and the top of the anaerobic reactor body are rotatably connected to the isolation sampling plate. The sampling insertion pipe can pass through the two isolation sampling plates in sequence and extend into the anaerobic reaction chamber to perform multi-layer stable sampling of the sludge after the reaction. The sampling airtightness is excellent, and sampling can be carried out without opening the tank. The vacuum pump can perform anaerobic vacuum adsorption treatment on the isolation sampling chamber, so that the device has good anaerobic multi-layer sampling capability and excellent sealed sampling capability.

[0014] 2. This multi-layer sludge sampling device for an anaerobic reactor uses two sealing switches installed at the bottom of two isolation sampling plates. The sealing switches can be opened and closed sequentially according to the sampling and removal requirements of the sampling connector, thus sealing or opening the anaerobic reaction chamber and the isolation sampling chamber. During sampling, the sampling connector opens the sampling switch to complete multi-layer sludge sampling within the anaerobic reaction chamber. After this, the sampling connector closes the sampling connector, facilitating multi-layer sealed sampling. The two isolation sampling plates are connected and can rotate synchronously for adjustment, allowing the sampling connector to sample sludge from multiple points inside the anaerobic reactor body. This makes the device easy to use for rapid multi-layer sampling, simple and convenient, and highly accurate. Attached Figure Description

[0015] Figure 1 This utility model provides a frontal perspective three-dimensional schematic diagram of a multi-layer sludge sampling device for an anaerobic reactor; Figure 2 This utility model provides a side view sectional perspective of a multilayer sludge sampling device for an anaerobic reactor. Figure 3 This utility model provides a front view sectional perspective schematic diagram of a multi-layer sludge sampling device for an anaerobic reactor; Figure 4 This is a frontal perspective three-dimensional schematic diagram of the connection structure between the isolation sampling plate and the rotating sealing ring of this utility model; Figure 5 This is a three-dimensional side view of the connection structure of the sampling connector and sampling switch of this utility model.

[0016] In the diagram: 1. Anaerobic reactor body; 101. Discharge pipe; 102. Feed pipe; 103. Control valve body; 2. Vacuum pump; 3. Sampling isolation plate; 4. Anaerobic reaction chamber; 5. Isolation sampling chamber; 501. Pressure monitor; 6. Isolation sampling plate; 601. Rotating sealing ring; 602. Synchronous moving plate; 603. Sealing mounting ring; 604. Moving handle; 7. Sampling insertion pipe; 8. Sealing switch; 801. Hinge sealing plate; 802. Moving control cylinder; 9. Sampling switch; 901. Annular cover; 902. Miniature waterproof cylinder; 903. Sealing connecting ring; 10. Switch controller. Detailed Implementation

[0017] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0018] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0019] Please see Figures 1-5 A multi-layer sludge sampling device for an anaerobic reactor includes an anaerobic reactor body 1 and a vacuum pump 2 installed on the side of the anaerobic reactor body 1. A sampling isolation plate 3 is fixedly installed inside the anaerobic reactor body 1. The interior of the anaerobic reactor body 1 is divided into an anaerobic reaction chamber 4 and an isolation sampling chamber 5 by a sampling isolation plate 3. The output end of the vacuum pump 2 is connected to the isolation sampling chamber 5. Isolation sampling plates 6 are rotatably connected to the top of the sampling isolation plate 3 and the anaerobic reactor body 1. Sampling insertion pipes 7 are inserted and installed on the two isolation sampling plates 6. Sealing switch components 8 corresponding to the position of the sampling insertion pipe 7 are provided at the bottom of the two isolation sampling plates 6. Sampling switch components 9 are provided at the bottom of the sampling insertion pipe 7. The beneficial effects that this plan aims to achieve are: The anaerobic reactor body 1 is divided into an anaerobic reaction chamber 4 and an isolation sampling chamber 5 by a sampling isolation plate 3. Anaerobic reaction treatment and vacuum oxygen isolation are performed respectively. The sampling isolation plate 3 and the top of the anaerobic reactor body 1 are rotatably connected to an isolation sampling plate 6. The sampling insertion pipe 7 can pass through the two isolation sampling plates 6 in sequence and extend into the anaerobic reaction chamber 4 to perform multi-layer stable sampling of the sludge after the reaction. The sampling airtightness is excellent, and sampling can be carried out without opening the tank. The vacuum pump 2 can perform anaerobic vacuum adsorption treatment on the isolation sampling chamber 5. Two sealing switches 8 are respectively installed at the bottom of the two isolation sampling plates 6. The sealing switches 8 can be opened and closed sequentially according to the sampling and removal requirements of the sampling connector 7 to close or open the anaerobic reaction chamber 4 and the isolation sampling chamber 5. When sampling, the sampling connector 7 opens the sampling switch 9. After completing the multi-layer sampling of sludge in the anaerobic reaction chamber 4, the sampling connector 7 can be closed by the sampling switch 9 to conveniently complete the multi-layer sealed sampling operation. The two isolation sampling plates 6 are connected and can be rotated and adjusted synchronously, which facilitates the sampling connector 7 to sample the sludge inside the anaerobic reactor body 1 at multiple points. This makes the device have good anaerobic multi-layer sampling capability, excellent sealed sampling capability, and facilitates multi-layer rapid sampling. The sampling is simple and convenient, and the sampling accuracy is high.

[0020] Furthermore, a pressure monitor 501 is installed inside the isolation sampling chamber 5, and a switch controller 10 is installed on the top of the anaerobic reactor body 1. The switch controller 10 is electrically connected to the vacuum pump 2, the pressure monitor 501, the sealing switch 8, and the sampling switch 9, respectively. Specifically, the isolation sampling chamber 5 is equipped with a pressure monitor 501, which can monitor the pressure changes inside the isolation sampling chamber 5 in real time. The top of the anaerobic reactor body 1 is equipped with a switch controller 10, which can control the vacuum pump 2, pressure monitor 501, sealing switch 8 and sampling switch 9. It is convenient to use. The sealing switch 8 can be switched on or off according to the sampling or removal of the sampling connector 7. It has good adaptability and is easy to use. The vacuum pump 2 can evacuate the isolation sampling chamber 5. After the pressure monitor 501 detects a specified value, the switch controller 10 controls the vacuum pump 2 to stop running. The isolation sampling chamber 5 plays an anaerobic isolation role. It has good adaptability and is easy to use.

[0021] Furthermore, the anaerobic reaction chamber 4 is located directly below the isolation sampling chamber 5. The bottom of the sampling insertion tube 7 passes through the isolation sampling chamber 5 and is connected to the anaerobic reaction chamber 4. The bottom of the anaerobic reactor body 1 is provided with a discharge pipe 101, and the side of the anaerobic reactor body 1 is provided with a feed pipe 102. Both the discharge pipe 101 and the feed pipe 102 are connected to the anaerobic reaction chamber 4. Both the discharge pipe 101 and the feed pipe 102 are provided with control valve bodies 103. Specifically, the anaerobic reaction chamber 4 is located directly below the isolation sampling chamber 5, and can perform anaerobic reaction and anaerobic isolation respectively. The bottom of the anaerobic reactor body 1 is provided with a discharge pipe 101 to facilitate the discharge of sludge from the anaerobic reaction chamber 4. The side of the anaerobic reactor body 1 is provided with a feed pipe 102 to facilitate the entry of raw materials into the anaerobic reaction chamber 4. The discharge and feeding processes are stable and controllable. The control valve body 103 plays a switching control role to prevent external oxygen from entering, and the switching control is convenient.

[0022] Furthermore, a rotating sealing ring 601 is rotatably connected to the outer side of the isolation sampling plate 6, and the two rotating sealing rings 601 are respectively embedded in the top of the anaerobic reactor body 1 and the middle of the sampling isolation plate 3. Specifically, the outer side of the isolation sampling plate 6 is rotatably connected with a rotating sealing ring 601, which can seal and embed the isolation sampling plate 6, making it easy to rotate and adjust the isolation sampling plate 6. At the same time, the sealing performance is good, so when the sampling insertion tube 7 is inserted into the isolation sampling plate 6, it can be rotated and adjusted, and the multi-point sampling of the sampling insertion tube 7 is convenient.

[0023] Furthermore, sealing mounting rings 603 are embedded in both isolation sampling plates 6, and sampling insertion tubes 7 are sequentially inserted into the two sealing mounting rings 603. The sampling insertion tubes 7 are sealed to the isolation sampling plates 6 by the sealing mounting rings 603. Specifically, when the sampling connector 7 is inserted into the isolation sampling plate 6, the sealing installation ring 603 can provide a sealing fit for the sampling connector 7 to prevent leakage and ensure good sealing performance.

[0024] Furthermore, a synchronous moving plate 602 is fixedly installed between the two isolation sampling plates 6, and a moving handle 604 is provided on the top of the top isolation sampling plate 6. Specifically, a synchronous moving plate 602 is fixedly installed between the isolation sampling plates 6, which facilitates the connection of the two isolation sampling plates 6 into one unit. The connection is stable and easy to operate, and it is convenient to rotate the isolation sampling plates 6 by hand. The top of the isolation sampling plate 6 is provided with a moving handle 604, which is convenient for rotation and adjustment. It is convenient for the two isolation sampling plates 6 to rotate and adjust synchronously, which drives the two sealing mounting rings 603 to rotate synchronously. The two sealing mounting rings 603 are vertically aligned, which is convenient for the insertion and placement of the sampling insertion pipe 7. The sealing switch 8 corresponds to the sealing mounting ring 603, which is convenient for the sealing switch 8 to open and close the sealing mounting ring 603.

[0025] Furthermore, the sealing switch component 8 includes a hinged sealing plate 801 and a movement control cylinder 802. The two hinged sealing plates 801 are respectively hinged to the bottom of the two isolation sampling plates 6. The two hinged sealing plates 801 are respectively located at the top of the anaerobic reaction chamber 4 and the isolation sampling chamber 5. The two ends of the movement control cylinder 802 are respectively hinged to the bottom of the hinged sealing plate 801 and the isolation sampling plate 6. The two hinged sealing plates 801 correspond to the positions of the sampling insertion tube 7. Specifically, the movable control cylinder 802 can push the hinged sealing plate 801 to move in a hinged sector shape, which facilitates the hinged sealing plate 801 to open and close the adjacent sealing mounting ring 603, and facilitates the sealing and switching of the anaerobic reaction chamber 4 and the isolation sampling chamber 5, making it convenient to use and operate.

[0026] Furthermore, the sampling switch component 9 includes an annular cover 901, a miniature waterproof cylinder 902, and a sealing connecting ring 903. The annular cover 901 is hinged to the bottom of the inner side of the sampling insertion tube 7. The two ends of the miniature waterproof cylinder 902 are respectively hinged to the inner side of the sampling insertion tube 7 and the top edge of the annular cover 901. The sealing connecting ring 903 is sleeved and sealed at the edge of the annular cover 901. The sealing connecting ring 903 and the bottom of the inner side of the sampling insertion tube 7 are matched. Specifically, the miniature waterproof cylinder 902 is a miniature cylinder, which is convenient for operation in narrow environments. Operating the miniature waterproof cylinder 902 can push the annular cover 901 to open and close the bottom of the sampling connector 7. The sealing ring 903 is sleeved and sealed at the edge of the annular cover 901, which improves the sealing performance of the sampling connector 7. When sampling is required, the annular cover 901 can be pulled to open the sampling connector 7. After sampling is completed, the sampling connector 7 can be closed for sampling monitoring. It is convenient to use and operate.

[0027] How to use and how to work this device: By fixing a sampling isolation plate 3 inside the anaerobic reactor body 1, the interior of the anaerobic reactor body 1 can be divided into an anaerobic reaction chamber 4 and an isolation sampling chamber 5. The anaerobic reaction chamber 4 can perform anaerobic reaction treatment on the sludge, and the isolation sampling chamber 5 can be vacuum isolated to ensure that oxygen cannot enter the anaerobic reaction chamber 4 during the sampling interval. The sampling isolation plate 3 and the top of the anaerobic reactor body 1 are rotatably connected to the isolation sampling plate 6. The sampling insertion pipe 7 passes through the two isolation sampling plates 6 in sequence and extends into the anaerobic reaction chamber 4 to perform multi-layer stable sampling of the sludge after the reaction. The sampling airtightness is excellent, and the sampling operation can be carried out without opening the anaerobic reactor body 1. It has good anaerobic multi-layer sampling capability and excellent sealed sampling capability. Two sealing switches 8 are respectively installed at the bottom of the two isolation sampling plates 6, serving as a switch. First, the top sealing switch 8 is opened, and the sampling insertion tube 7 passes through the top isolation sampling plate 6 and is inserted into the isolation sampling chamber 5. The vacuum pump 2 is run, and the sampling switch 9 is opened simultaneously to create a vacuum negative pressure inside the isolation sampling chamber 5 and the sampling insertion tube 7. After the set vacuum level is reached, the bottom sealing switch 8 is opened, and the sampling insertion tube 7 moves downward, passes through the bottom isolation sampling plate 6, and is inserted into the anaerobic reaction chamber 4. The sampling insertion tube 7 slowly moves downward to perform multi-level sampling of sludge at different depths in the anaerobic reaction chamber 4. After the sample enters the sampling insertion tube 7, the sampling switch 9 closes the valve. The sampling connector 7 is closed and then moved upwards. After the sampling connector 7 is separated from the anaerobic reaction chamber 4, it enters the isolation sampling chamber 5. After the anaerobic reaction chamber 4 is closed by the bottom sealing switch 8, the sampling connector 7 is separated from the anaerobic reactor body 1, completing the sampling operation. Sampling is convenient when the whole is sealed and closed, and the sampling process is relatively convenient. The two isolation sampling plates 6 are connected and can be rotated and adjusted synchronously, which makes it easy for the sampling connector 7 to sample the sludge inside the anaerobic reactor body 1 at multiple points. It is convenient to carry out multi-layer rapid sampling, and the sampling is simple, convenient and accurate. The device has good anaerobic multi-layer sampling capability, excellent sealing sampling capability, and is convenient to carry out multi-layer rapid sampling. The sampling is simple, convenient and accurate.

[0028] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A multi-layer sludge sampling device for an anaerobic reactor, comprising an anaerobic reactor body (1) and a vacuum pump (2) installed on the side of the anaerobic reactor body (1), characterized in that: A sampling isolation plate (3) is fixedly installed inside the anaerobic reactor body (1); The interior of the anaerobic reactor body (1) is divided into an anaerobic reaction chamber (4) and an isolation sampling chamber (5) by a sampling isolation plate (3). The output end of the vacuum pump (2) is connected to the isolation sampling chamber (5). The top of the sampling isolation plate (3) and the anaerobic reactor body (1) are rotatably connected to isolation sampling plates (6). Sampling insertion pipes (7) are inserted and installed on the two isolation sampling plates (6). The bottom of the two isolation sampling plates (6) is provided with sealing switch components (8) corresponding to the position of the sampling insertion pipes (7). The bottom of the sampling insertion pipes (7) is provided with sampling switch components (9).

2. The anaerobic reactor multilayer sludge sampling device according to claim 1, characterized in that: The isolation sampling chamber (5) is equipped with a pressure monitor (501), and the top of the anaerobic reactor body (1) is equipped with a switch controller (10). The switch controller (10) is electrically connected to the vacuum pump (2), the pressure monitor (501), the sealing switch (8), and the sampling switch (9).

3. The anaerobic reactor multilayer sludge sampling device according to claim 1, characterized in that: The anaerobic reaction chamber (4) is located directly below the isolation sampling chamber (5). The bottom of the sampling insertion tube (7) passes through the isolation sampling chamber (5) and is connected to the anaerobic reaction chamber (4). The bottom of the anaerobic reactor body (1) is provided with a discharge pipe (101). The side of the anaerobic reactor body (1) is provided with a feed pipe (102). The discharge pipe (101) and the feed pipe (102) are both connected to the anaerobic reaction chamber (4). The discharge pipe (101) and the feed pipe (102) are both provided with control valve bodies (103).

4. The anaerobic reactor multilayer sludge sampling device according to claim 1, characterized in that: The outer side of the isolation sampling plate (6) is rotatably connected with a rotating sealing ring (601), and the two rotating sealing rings (601) are respectively embedded in the top of the anaerobic reactor body (1) and the middle of the sampling isolation plate (3).

5. The anaerobic reactor multilayer sludge sampling device according to claim 1, characterized in that: Both isolation sampling plates (6) are embedded with sealing mounting rings (603), and the sampling insertion tube (7) is inserted into the two sealing mounting rings (603) in sequence. The sampling insertion tube (7) is sealed to the isolation sampling plate (6) by the sealing mounting rings (603).

6. The anaerobic reactor multilayer sludge sampling device according to claim 1, characterized in that: A synchronous moving plate (602) is fixedly installed between the two isolation sampling plates (6), and a moving handle (604) is provided on the top of the top isolation sampling plate (6).

7. The anaerobic reactor multilayer sludge sampling device according to claim 1, characterized in that: The sealing switch component (8) includes a hinged sealing plate (801) and a movement control cylinder (802). The two hinged sealing plates (801) are respectively hinged to the bottom of the two isolation sampling plates (6). The two hinged sealing plates (801) are respectively located at the top of the anaerobic reaction chamber (4) and the isolation sampling chamber (5). The two ends of the movement control cylinder (802) are respectively hinged to the bottom of the hinged sealing plate (801) and the isolation sampling plate (6). The two hinged sealing plates (801) correspond to the position of the sampling insertion tube (7).

8. The anaerobic reactor multilayer sludge sampling device according to claim 1, characterized in that: The sampling switch (9) includes an annular cover (901), a miniature waterproof cylinder (902), and a sealing connecting ring (903). The annular cover (901) is hinged to the bottom of the inner side of the sampling insertion tube (7). The two ends of the miniature waterproof cylinder (902) are respectively hinged to the inner side of the sampling insertion tube (7) and the top edge of the annular cover (901). The sealing connecting ring (903) is sleeved and sealed at the edge of the annular cover (901). The sealing connecting ring (903) matches the bottom of the inner side of the sampling insertion tube (7).

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