Water eDNA collecting and filtering device

Abstract

The utility model belongs to the field of sampling equipment, and particularly relates to a water eDNA collecting and filtering device which comprises an upper cover body with an upper filtering plate, a lower cover body with a lower filtering plate, a filtering cavity formed by the upper filtering plate and the lower filtering plate and a filtering membrane located in the filtering cavity, a water inlet is formed in the upper end of the upper cover body, and a water outlet is formed in the lower end of the lower cover body. A water passing groove and a first water stopping groove with a sealing ring are formed in the lower cover body, the sealing ring in the first water stopping groove makes contact with the lower surface of the upper cover body to form a sealing seam, the first water stopping groove is located between the filtering cavity and the water passing groove, and a set of water passing holes formed at intervals are connected between the water passing groove and the water drainage opening in a penetrating mode; the upper cover body and the lower cover body are connected by virtue of the connecting assembly, so that the extracted water flow can be decompressed in time, the filter membrane is prevented from being deformed and damaged, and the sampling accuracy is improved.

Description

Technical Field

[0001] The utility model belongs to the field of sampling equipment, and in particular relates to a water body eDNA collection and filtering device. Background Art

[0002] eDNA technology is a new biological survey method technology that has emerged in recent years. The use of water eDNA technology can be used to investigate water biodiversity and has broad application prospects in the protection of aquatic ecosystems. The existing water eDNA sampling and collection device consists of a water pump, a sampling rod, and a prefabricated collection filter cover. The prefabricated collection filter cover is provided with a filter membrane. When working, the sampling rod is inserted into the water, and the water pumped by the water pump enters the prefabricated filter cover through the sampling rod and is filtered through the filter membrane to collect water eDNA. In order to achieve effective water extraction, the water pump often uses a large suction force, which also leads to a large impact force of the extracted water flow. When the water flow is large, the resistance of the filter membrane is large, which is easy to cause deformation and damage of the filter membrane, and it is impossible to achieve effective filtration of the water body, thereby affecting the accuracy of the sampling data. Utility Model Content

[0003] In order to solve the problems existing in the above-mentioned prior art, the utility model provides a water body eDNA collection and filtration device, which can timely relieve the pressure of the extracted water flow, prevent the filter membrane from deformation and damage, and improve the accuracy of sampling.

[0004] The specific technical solution adopted by the utility model is:

[0005] A water body eDNA collection and filtration device comprises an upper cover body with an upper filter plate, a lower cover body with a lower filter plate, a filter cavity formed by the upper and lower filter plates, and a filter membrane located in the filter cavity, the upper end of the upper cover body is provided with a water inlet, the lower end of the lower cover body is provided with a drain, and the key point is that a water through groove and a first water stop groove with a sealing ring are respectively provided on the lower cover body, the first water stop groove is located between the filter cavity and the water through groove, the sealing ring in the first water stop groove contacts with the lower surface of the upper cover body to form a sealing seam, a group of spaced water through holes are connected between the water through groove and the drain, and the upper cover body and the lower cover body are connected by a connecting assembly.

[0006] Furthermore, the connecting assembly includes a first internal thread sleeve mounted on the upper cover body and a first external thread fixedly connected to the lower cover body. The upper cover body is provided with a boss matching the first internal thread sleeve. The first internal thread sleeve is screwed with the first external thread and the upper cover body is pressed and fixed to the lower cover body with the help of the boss.

[0007] Furthermore, the water passage is arranged adjacent to the first external thread.

[0008] Furthermore, the connecting assembly includes a second external thread fixedly connected to the upper cover body and a second internal thread sleeve fixedly connected to the lower cover body, and the second external thread and the second internal thread sleeve are screwed together.

[0009] Furthermore, a second water stop groove is provided on the lower cover body, the water passage groove is located between the first water stop groove and the second water stop groove, and a sealing ring is provided in the second water stop groove to contact with the lower surface of the upper cover body to form a seal.

[0010] Furthermore, the upper cover body and the lower cover body are both funnel-shaped structures, and the upper filter plate and the lower filter plate are respectively located at the open ends of the upper cover body and the lower cover body of the funnel-shaped structure.

[0011] The beneficial effects of the utility model are:

[0012] The utility model is characterized in that a water-passing groove is arranged on the lower cover body, a first water-stopping groove is arranged between the water-passing groove and the filter chamber, a sealing ring is arranged in the first water-stopping groove, the sealing ring in the first water-stopping groove contacts with the lower surface of the upper cover body to form a sealing seam, the first water-stopping groove is close to the filter chamber, and a certain seal is formed in the filter chamber with the help of the sealing ring, so as to ensure that the water flow can pass through the filter membrane in the filter chamber under sufficient pressure; when the pressure increases, the water flow that has not passed through the filter membrane squeezes the sealing ring through the filter chamber, so that the gap of the sealing seam increases, and the water flow flows into the water-passing groove through the increased sealing seam, so as to timely relieve the pressure of the filter chamber, appropriately discharge the water in the filter chamber, reduce the resistance of the filter membrane, prevent the deformation and damage of the filter membrane caused by excessive water flow, and then enable the filter membrane to effectively filter the water body, collect eDNA in the water body, and improve the accuracy of sampling; the setting of the water-passing hole balances the pressure in the water-passing groove, so that the excess water flow in the filter chamber can enter the water-passing groove in time, and the water flow entering the water-passing groove is discharged to the drain outlet along the water-passing hole, so as to continuously relieve the pressure of the filter chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of Example 1;

[0014] Figure 2 It is a structural schematic diagram of the upper cover body of Example 1;

[0015] Figure 3 It is a structural schematic diagram of the lower cover body of Example 1;

[0016] Figure 4 It is a bottom view of the lower cover body of Example 1;

[0017] Figure 5 is a schematic structural diagram of a first internal thread sleeve;

[0018] Figure 6 It is a structural schematic diagram of Example 2;

[0019] Figure 7 It is a structural schematic diagram of the upper cover body of Example 2;

[0020] Figure 8 It is a structural schematic diagram of the lower cover body of Example 2;

[0021] Fig. 9 It is a structural schematic diagram of Example 3;

[0022] In the accompanying drawings, 1, upper cover body, 2, lower cover body, 3, filter chamber, 4, filter membrane, 5, water inlet, 6, drain outlet, 7, upper filter plate, 8, lower filter plate, 10, water groove, 11, first water stop groove, 12, water hole, 13, second water stop groove, 14, first internal thread sleeve, 15, first external thread, 16, boss, 17, second external thread, 18, second internal thread sleeve. DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments:

[0024] Embodiment 1, as Figure 1-5As shown, a water body eDNA collection and filtration device comprises an upper cover body 1 with an upper filter plate 7, a lower cover body 2 with a lower filter plate 8, a filter chamber 3 formed by means of the upper filter plate 7 and the lower filter plate 8, and a filter membrane 4 located in the filter chamber 3. The upper end of the upper cover body 1 is provided with a water inlet 5, and the lower end of the lower cover body 2 is provided with a drain 6. The key is that a water groove 10 and a first water stop groove 11 with a sealing ring are respectively provided on the lower cover body 2. The first water stop groove 11 is located between the filter chamber 3 and the water groove 10. The sealing ring in the first water stop groove 11 contacts with the lower surface of the upper cover body 1 to form a sealing seam. In this embodiment, the sealing ring is made of rubber. A group of spaced water holes 12 are connected between the water groove 10 and the drain 6. The first water stop groove 11 is close to the filter chamber 3. The filter chamber 3 is sealed to a certain extent by means of the sealing ring to ensure that the water flow can pass through the filter membrane 4 in the filter chamber 3 under sufficient pressure. When the pressure increases, The water that does not pass through the filter membrane 4 passes through the filter chamber 3 and squeezes the sealing ring in the first water stop groove 11, thereby increasing the gap of the sealing seam. The water flows into the water-passing groove 10 through the enlarged sealing seam, timely relieving the pressure of the filter chamber 3, appropriately discharging the water in the filter chamber, reducing the resistance of the filter membrane, and preventing the deformation and damage of the filter membrane caused by excessive water flow, so that the filter membrane 4 can effectively filter the water body, collect eDNA in the water body, and improve the accuracy of sampling; the setting of the water-passing hole 12 balances the pressure in the water-passing groove 10, so that the excess water in the filter chamber 3 can enter the water-passing groove 10 in time, and the water entering the water-passing groove 10 is discharged after being discharged to the drain port 6 through the water-passing hole 12, continuously relieving the pressure of the filter chamber 3; the upper cover body 1 and the lower cover body 2 are connected by means of a connecting component. After completing a sampling, the filter chamber 3 is opened by the connecting component to facilitate the removal and placement of the filter membrane 4, and the upper cover body 1 and the lower cover body 2 can be reused to reduce the use of consumables.

[0025] The connecting assembly includes a first internal thread sleeve 14 sleeved on the upper cover body 1 and a first external thread 15 fixedly connected to the lower cover body 2. The upper cover body 1 is provided with a boss 16 matched with the first internal thread sleeve 14. The first internal thread sleeve 14 is screwed with the first external thread 15 and the upper cover body 1 is pressed and fixed on the lower cover body 2 by means of the boss 16.

[0026] When taking and placing the filter membrane 4, there is no need to rotate the upper cover body 1 or the lower cover body 2, and the upper cover body 1 and the lower cover body 2 are kept relatively still. The upper cover body 1 and the lower cover body 2 can be separated or connected by rotating the first internal thread sleeve 14, which is more convenient to operate and has high connection stability; the upper end of the first external thread 15 is higher than the water groove 10 and is adjacent to the first external thread 15, and a group of reinforcing ribs are arranged between the water groove 10 and the first external thread 15, and the reinforcing ribs are respectively located between adjacent water holes 12, thereby reducing the extension length outside the water groove 10 on the lower cover body 2 and improving the strength and connection stability of the lower cover body 2.

[0027] The upper cover body 1 and the lower cover body 2 are both funnel-shaped structures, and the upper filter plate 7 and the lower filter plate 8 are respectively located at the open ends of the upper cover body 1 and the lower cover body 2 of the funnel-shaped structure, so that the cross-sectional area of ​​the filter chamber 3 formed by the upper filter plate 7 and the lower filter plate 8 is larger than the cross-sectional area of ​​the water inlet 5 and the drain outlet 6, thereby reducing the pressure of the water flow in the filter chamber 3, helping the filter membrane 4 to fully filter the water body, and further improving the accuracy of sampling.

[0028] Embodiment 2, as Figure 6-8 As shown, this embodiment is basically the same as embodiment 1, and the only difference is that the connecting component includes a second external thread 17 fixedly connected to the upper cover body 1 and a second internal thread sleeve 18 fixedly connected to the lower cover body 2, and the second external thread 17 and the second internal thread sleeve 18 are screwed together. When the filter membrane 4 is taken and placed, the upper cover body 1 and the lower cover body 2 are rotated relative to each other to open the filter chamber 3, and the operation is convenient and quick. A second water stop groove 13 is also provided on the lower cover body 2, and the second water stop groove 13 is adjacent to the second internal thread sleeve 18. The water groove 10 is located between the first water stop groove 11 and the second water stop groove 13. A sealing ring is provided in the second water stop groove 13 to contact with the lower surface of the upper cover body 1 to form a seal, so as to prevent the water in the water groove 10 from overflowing from the connecting components between the upper cover body 1 and the lower cover body 2, thereby keeping the environment clean.

[0029] Embodiment 3, as Fig. 9 As shown, this embodiment is basically the same as embodiment 1, and the only difference is that a second water stopping groove 13 is provided on the lower cover body 2, and the water passing groove 10 is located between the first water stopping groove 11 and the second water stopping groove 13, and a sealing ring is provided in the second water stopping groove 13 to contact with the lower surface of the upper cover body 1 to form a seal, and the sealing ring in the second water stopping groove 13 blocks the water in the water passing groove 10 to prevent the water in the water passing groove 10 from overflowing from the connecting components between the upper cover body 1 and the lower cover body 2, thereby improving the sealing performance of the filtering device and keeping the environment clean.

Claims

1. A water body eDNA collection and filtration device, comprising an upper cover body (1) with an upper filter plate (7), a lower cover body (2) with a lower filter plate (8), a filter cavity (3) formed by the upper filter plate (7) and the lower filter plate (8), and a filter membrane (4) located in the filter cavity (3), wherein the upper end of the upper cover body (1) is provided with a water inlet (5), and the lower end of the lower cover body (2) is provided with a drain outlet (6), characterized in that: The lower cover body (2) is provided with a water groove (10) and a first water stop groove (11) with a sealing ring. The first water stop groove (11) is located between the filter chamber (3) and the water groove (10). The sealing ring in the first water stop groove (11) contacts the lower surface of the upper cover body (1) to form a sealing seam. A group of spaced water holes (12) are connected between the water groove (10) and the drain outlet (6). The upper cover body (1) and the lower cover body (2) are connected by means of a connecting assembly.

2. The water eDNA collection and filtration device according to claim 1, characterized in that: The connecting assembly comprises a first internal thread sleeve (14) sleeved on the upper cover body (1) and a first external thread (15) fixedly connected to the lower cover body (2); the upper cover body (1) is provided with a boss (16) matching the first internal thread sleeve (14); the first internal thread sleeve (14) is screwed with the first external thread (15) and the upper cover body (1) is pressed and fixed to the lower cover body (2) by means of the boss (16).

3. The water eDNA collection and filtration device according to claim 2, characterized in that: The water passage (10) is arranged adjacent to the first external thread (15).

4. The water eDNA collection and filtration device according to claim 1, characterized in that: The connecting assembly comprises a second external thread (17) fixedly connected to the upper cover body (1) and a second internal thread sleeve (18) fixedly connected to the lower cover body (2), and the second external thread (17) and the second internal thread sleeve (18) are screwed together.

5. The water eDNA collection and filtration device according to claim 1, characterized in that: The lower cover body (2) is provided with a second water stop groove (13), the water passage groove (10) is located between the first water stop groove (11) and the second water stop groove (13), and the second water stop groove (13) is provided with a sealing ring which contacts with the lower surface of the upper cover body (1) to form a seal.

6. The water eDNA collection and filtration device according to claim 1, characterized in that: The upper cover body (1) and the lower cover body (2) are both funnel-shaped structures, and the upper filter plate (7) and the lower filter plate (8) are respectively located at the open ends of the upper cover body (1) and the lower cover body (2) of the funnel-shaped structure.

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