Liquid collection bottle connection structure and water sample filtering device

Abstract

The utility model relates to a kind of liquid collection bottle connecting structure, including support, pressing plate, into pipe, discharge pipe and hold-down part, the support is used to be fixed on water sample suction filter host, the support is used to support liquid collection bottle horizontally, the pressing plate can be up and down sliding type set on the support, the into pipe and discharge pipe are all fixed on the pressing plate, the lower end of into pipe and the lower end of discharge pipe are all located the downside of the pressing plate after passing through the pressing plate, the hold-down part is used to push the pressing plate downward, to make the pressing plate hold-down liquid collection bottle on the support and close the bottle mouth of the upper end of the liquid collection bottle. Since the above technical solution is adopted, it is more convenient to install the liquid collection bottle on the liquid collection bottle connecting structure of the utility model and to disassemble the liquid collection bottle from the liquid collection bottle connecting structure of the utility model. The utility model further relates to a water sample filtering device, comprising the above-mentioned liquid collection bottle connecting structure.

Description

Technical Field

[0001] This utility model relates to the field of environmental monitoring technology, specifically to a liquid collection bottle connection structure and a water sample filtration device. Background Technology

[0002] To determine the level of environmental pollution and environmental quality, environmental monitoring is necessary. Water quality monitoring is a crucial component of environmental monitoring, which includes sampling, sample preservation and transportation, and laboratory analysis. Before analysis, water samples need to be filtered to remove suspended solids and particulate matter, ensuring the accuracy and reliability of the results. This filtration process requires the use of a water sample filtration device.

[0003] Currently, water sample filters are commonly used as filtration devices for water samples. A typical water sample filter includes a main unit, a filter cup, a safety bottle, a collection bottle, and a connection structure for the collection bottle. The connection structure consists of a connecting cap, an inlet pipe, and an outlet pipe. Before filtering the water sample, an empty collection bottle is installed on the connection structure. Specifically, the collection bottle is connected to the connecting cap, which seals the top opening of the bottle, allowing both the inlet and outlet pipes to connect to the inner cavity of the collection bottle. The outlet of the filter cup is then connected to the inlet pipe on the connecting cap via a liquid guide pipe. The outlet pipe is connected to the inlet of the safety bottle via an overflow pipe. The outlet of the safety bottle is connected to the air inlet of the main unit of the water sample filter via an exhaust pipe. A filter membrane is then installed inside the filter cup. Finally, the water sample to be filtered is poured into the filter cup, and the main unit of the water sample filter is started. Filtration of the water sample then begins.

[0004] During the filtration process of a water sample filter, under the suction action of the main unit of the water sample filter, the air in the collection bottle can flow through the discharge pipe, overflow pipe, safety bottle and exhaust pipe in sequence before entering the main unit of the water sample filter. A negative pressure will be formed in the collection bottle. Under the action of the negative pressure in the collection bottle, the water in the filtration cup can pass through the filter membrane relatively quickly and enter the collection bottle through the liquid guide pipe. The water entering the collection bottle is the filtered water sample.

[0005] Since the volume of water samples is often quite large, when the collection bottle is almost full after filtration, the water sample filter should be paused. Then, the collection bottle containing the filtered water sample should be removed from the connecting structure. An empty collection bottle should then be installed back onto the connecting structure. The water sample filter should then be restarted to continue filtration. The removed collection bottle containing the filtered water sample should be capped and stored.

[0006] The collection bottle has external threads on its mouth and internal threads on its connecting cap. The collection bottle is installed on the existing collection bottle connection structure by threading it into the connecting cap. Both installing and removing the collection bottle from the connection structure require holding the bottle with one hand and the connecting cap with the other, then rotating the bottle several times on the cap. This makes the installation and removal of the collection bottle from the connection structure quite cumbersome. Utility Model Content

[0007] In view of this, the purpose of this utility model is to provide a liquid collection bottle connection structure and a water sample filtration device to solve the technical problem that it is quite troublesome to install and disassemble the liquid collection bottle on the liquid collection bottle connection structure when using existing water sample vacuum filters.

[0008] This utility model is achieved through the following technical solution:

[0009] A liquid collection bottle connection structure includes a bracket, a pressure plate, an inlet pipe, an outlet pipe, and a holding part. The bracket is used to be fixed on the main body of a water sample filter and to horizontally support the liquid collection bottle. The pressure plate is slidably mounted on the bracket. The inlet pipe and the outlet pipe are both fixed on the pressure plate. The lower ends of the inlet pipe and the outlet pipe pass through the pressure plate and are located on the lower side of the pressure plate. The holding part is used to push the pressure plate downward so that the pressure plate presses the liquid collection bottle on the bracket and closes the bottle opening at the upper end of the liquid collection bottle.

[0010] Furthermore, the support includes a vertical plate and a first horizontal plate. The back of the vertical plate is used to fix it to the main body of the water sample filter. The first horizontal plate is fixed to the front of the lower end of the vertical plate and is arranged in a horizontal direction.

[0011] The pressure plate is located above the first horizontal plate and can be slidably mounted on the vertical plate.

[0012] Furthermore, a slide rail is formed by protrusion on the front of the vertical plate; a groove is formed by recess on the side of the pressure plate facing the vertical plate, and the groove is slidably engaged with the slide rail.

[0013] Furthermore, the lower side of the pressure plate is recessed upward to form a groove that matches the mouth of the collection bottle. The lower ends of the inlet pipe and the outlet pipe are both located in the groove. The minimum distance between the lower edge of the inlet pipe and the edge of the groove, and the minimum distance between the lower edge of the outlet pipe and the edge of the groove, are both greater than the thickness of the bottle wall at the mouth of the collection bottle.

[0014] Furthermore, the bracket also includes a sealing gasket fixed to the upper side wall of the groove, the sealing gasket cooperating with the groove, a first through hole corresponding to the position of the inlet pipe and cooperating with the inlet pipe is formed on the sealing gasket, and a second through hole corresponding to the position of the outlet pipe and cooperating with the outlet pipe is formed on the sealing gasket; the lower end of the inlet pipe is located in the first through hole, and the lower end of the outlet pipe is located in the second through hole.

[0015] Furthermore, the bracket also includes two limiting strips, both of which are fixed to the upper side of the first horizontal plate. The distance between the ends of the two limiting strips facing the vertical plate is less than the diameter of the collection bottle, and the distance between the ends of the two limiting strips facing away from the vertical plate is greater than the diameter of the collection bottle. The two limiting strips form a figure-eight structure. When the collection bottle is located between the two limiting strips and abuts against both limiting strips, the bottle opening of the collection bottle faces upwards and directly into the groove.

[0016] Furthermore, the pressing part includes a second horizontal plate and a helical spring. The second horizontal plate is fixed on the vertical plate and located above the pressure plate. The upper end of the helical spring is fixedly connected to the second horizontal plate, and the lower end is fixedly connected to the pressure plate.

[0017] Furthermore, a hole is formed in the second horizontal plate; the pressing part also includes a pull rod, the lower end of which is fixedly connected to the pressure plate, and the upper end of which passes through the hole and is located above the second horizontal plate.

[0018] Furthermore, the pressing part includes a counterweight block, which is fixed to the pressure plate.

[0019] This utility model also provides a water sample filtration device, including the above-mentioned collection bottle connection structure.

[0020] The beneficial effects of this utility model are as follows:

[0021] When installing the collection bottle onto the collection bottle connecting structure described in this utility model, and when removing the collection bottle from the collection bottle connecting structure described in this utility model, it is only necessary to perform the vertical movement of the pressure plate and the horizontal movement of the collection bottle. Both the installation and removal of the collection bottle from the collection bottle connecting structure described in this utility model are quite convenient.

[0022] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a preferred embodiment of the liquid collection bottle connection structure of this utility model;

[0024] Figure 2 This is a top view of a preferred embodiment of the liquid collection bottle connection structure of this utility model;

[0025] Figure 3 for Figure 2 AA section view;

[0026] Figure 4 This is a usage diagram of a preferred embodiment of the liquid collection bottle connection structure of this utility model;

[0027] Figure 5 This is a top view of another preferred embodiment of the liquid collection bottle connection structure of this utility model;

[0028] Figure 6 for Figure 5 BB cross-sectional view;

[0029] Figure 7 and Figure 8 This is a schematic diagram of another preferred embodiment of the liquid collection bottle connection structure of this utility model.

[0030] In the diagram: pressure plate-1; inlet pipe-2; outlet pipe-3; collection bottle-4; vertical plate-5; first horizontal plate-6; slide rail-7; groove-8; limit bar-9; second horizontal plate-10; spiral spring-11; pull rod-12; sealing gasket-13; counterweight-14. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages 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 with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] In the above description of this utility model, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0036] Example 1

[0037] Please see Figure 1-4 This utility model provides a technical solution: a liquid collection bottle connection structure, including a bracket, a pressure plate 1, an inlet pipe 2, an outlet pipe 3, and a holding part. The bracket is used to be fixed on the main body of a water sample filter. The main body of the water sample filter can be the main body of a portable water sample filter of model LB-8300. The bracket is used to horizontally support the liquid collection bottle 4. The pressure plate 1 is slidably mounted on the bracket. The inlet pipe 2 and the outlet pipe 3 are both fixed on the pressure plate 1. The lower ends of the inlet pipe 2 and the outlet pipe 3 pass through the pressure plate 1 and are located on the lower side of the pressure plate 1. The holding part is used to push the pressure plate 1 downward so that the pressure plate 1 presses the liquid collection bottle 4 on the bracket and closes the bottle mouth at the upper end of the liquid collection bottle 4.

[0038] When the inlet pipe 2 and the outlet pipe 3 are arranged on the pressure plate 1, the distance between the lower end of the inlet pipe 2 away from the edge of the outlet pipe 3 and the lower end of the outlet pipe 3 away from the edge of the inlet pipe 2 is less than the diameter of the mouth of the collection bottle 4. When the pressure plate 1 presses the collection bottle 4 on the support and closes the mouth of the collection bottle 4, the lower ends of both the inlet pipe 2 and the outlet pipe 3 are located within the mouth range of the collection bottle 4.

[0039] Before filtering a water sample using a water sample filter with the collection bottle connection structure described in this invention, an empty collection bottle 4 is installed on the collection bottle connection structure. The specific steps are as follows: First, the pressure plate 1 is moved upwards a certain distance on the support so that it is positioned above the collection bottle 4 when it is horizontally supported on the support. Then, the collection bottle 4 is horizontally supported on the support, and the holding part pushes the pressure plate 1 downwards, causing the pressure plate 1 to press down on the collection bottle 4 on the support and close the upper opening of the collection bottle 4, so that the lower ends of the inlet pipe 2 and the outlet pipe 3 are both within the range of the bottle opening of the collection bottle 4. At this time, the collection bottle 4 is held on the support by the holding part and the pressure plate 1, and the collection bottle 4 can thus be installed on the collection bottle connection structure.

[0040] Then, connect the outlet of the filtration cup to the inlet pipe 2 on the pressure plate 1 through the liquid guide pipe, connect the outlet pipe 3 on the pressure plate 1 to the inlet of the safety bottle through the overflow pipe, connect the outlet of the safety bottle to the air inlet of the water sample filtration unit through the exhaust pipe, install the filter membrane in the filtration cup, pour the water sample to be filtered into the filtration cup and start the water sample filtration unit, and the water sample can be filtered at this time.

[0041] During the filtration of water samples using the water sample filter with the collection bottle connection structure described in this invention, under the suction action of the main unit of the water sample filter, the air in the collection bottle 4 flows sequentially through the discharge pipe 3, overflow pipe, safety bottle, and exhaust pipe before entering the main unit of the water sample filter. A negative pressure is formed inside the collection bottle. Under the action of this negative pressure, the water in the filtration cup can quickly pass through the filter membrane and enter the collection bottle 4 through the liquid guide pipe. The water entering the collection bottle 4 is the filtered water sample. The water sample filter with the collection bottle connection structure described in this invention can thus filter water samples.

[0042] When the filtered water sample is almost full in the collection bottle 4, detach the collection bottle 4 from the collection bottle connecting structure. Specifically, first pause the water sample filter main unit, then move the pressure plate 1 upwards to release the pressure of the pressure plate 1 on the collection bottle 4. Then, the collection bottle 4 can be moved horizontally and removed from the support. This allows the collection bottle 4 to be detached from the collection bottle connecting structure. Then, following the steps described above for installing the collection bottle 4 onto the collection bottle connecting structure, install another empty collection bottle 4 onto the collection bottle connecting structure, and then restart the water sample filter main unit to continue filtering the water sample.

[0043] When installing the collection bottle 4 onto the collection bottle connecting structure described in this utility model, and when removing the collection bottle 4 from the collection bottle connecting structure described in this utility model, it is only necessary to perform the operation of vertically moving the pressure plate 1 and the operation of horizontally moving the collection bottle 4. Both the installation and removal of the collection bottle 4 from the collection bottle connecting structure described in this utility model are relatively convenient.

[0044] In this embodiment, the support includes a vertical plate 5 and a first horizontal plate 6. The back of the vertical plate 5 is used to fix it to the main body of the water sample filter. Specifically, the back of the vertical plate 5 can be fixed to the main body of the water sample filter by adhesive. The first horizontal plate 6 is fixed to the front of the lower end of the vertical plate 5 and is arranged in the horizontal direction.

[0045] The pressure plate 1 is located above the first horizontal plate 6 and can be slidably mounted on the vertical plate 5.

[0046] The collection bottle 4 is supported on the first horizontal plate 6, which provides horizontal support for the collection bottle 4. The bracket also provides horizontal support for the collection bottle 4. The pressure plate 1 is slidably mounted on the vertical plate 5, thereby allowing it to be slidably mounted on the bracket.

[0047] In this embodiment, a slide rail 7 is formed by protrusion on the front of the vertical plate 5; a groove is formed by recess on the side of the pressure plate 1 facing the vertical plate 5, and the groove is slidably engaged with the slide rail 7. With this structure, the pressure plate 1 can be slidably mounted on the vertical plate 5.

[0048] In this embodiment, the cross-section of the slide rail 7 is a dovetail shape with the smaller end facing the vertical plate 5. Since the groove slides onto the slide rail 7, its cross-section is also a dovetail shape with the smaller end facing the vertical plate 5; that is, the groove is a dovetail groove. This structure prevents the pressure plate 1 from moving away from the vertical plate 5 and detaching from the slide rail 7, thus improving the stability of the liquid collection bottle connection structure described in this invention.

[0049] In this embodiment, the lower side of the pressure plate 1 is recessed upward to form a groove 8 that matches the mouth of the collection bottle 4. The lower ends of the inlet pipe 2 and the outlet pipe 3 are both located in the groove 8. The minimum distance between the lower edge of the inlet pipe 2 and the edge of the groove 8 and the minimum distance between the lower edge of the outlet pipe 3 and the edge of the groove 8 are both greater than the thickness of the bottle wall at the mouth of the collection bottle 4.

[0050] When the collection bottle 4 is horizontally supported on the first horizontal plate 6, the bottle mouth of the collection bottle 4 faces upward and is directly opposite the groove 8. When the pressure plate 1 is pressed on the collection bottle 4, the bottle mouth of the collection bottle 4 is located in the groove 8, and the bottle mouth of the collection bottle 4 abuts against the upper side wall of the groove 8. The upper side wall of the groove 8 can then close the bottle mouth of the collection bottle 4.

[0051] After the mouth of the collection bottle 4 is located in the groove 8, during the process of filtering water samples using a water sample filter with the collection bottle connection structure described in this invention, the groove 8 can limit the position of the collection bottle 4, making it difficult for the collection bottle 4 to move horizontally, thereby improving the connection stability between the collection bottle 4 and the collection bottle connection structure.

[0052] Since the lower ends of both the inlet pipe 2 and the outlet pipe 3 are located within the groove 8, the minimum distance between the lower edge of the inlet pipe 2 and the edge of the groove 8, and the minimum distance between the lower edge of the outlet pipe 3 and the edge of the groove 8, are both greater than the wall thickness at the mouth of the collection bottle 4. When the pressure plate 1 presses down on the collection bottle 4 on the support and closes the mouth of the collection bottle 4, that is, when the mouth of the collection bottle 4 is located within the groove 8 and the mouth of the collection bottle 4 abuts against the upper side wall of the groove 8, the lower ends of both the inlet pipe 2 and the outlet pipe 3 can be located within the mouth range of the collection bottle 4.

[0053] In this embodiment, the bracket further includes two limiting strips 9, both of which are fixed to the upper side of the first horizontal plate 6. The distance between the ends of the two limiting strips 9 facing the vertical plate 5 is less than the diameter of the liquid collection bottle 4, and the distance between the ends of the two limiting strips 9 facing away from the vertical plate 5 is greater than the diameter of the liquid collection bottle 4. The two limiting strips 9 form a figure-eight structure. When the liquid collection bottle 4 is located between the two limiting strips 9 and abuts against both limiting strips 9, the bottle mouth of the liquid collection bottle 4 faces upward and directly faces the groove 8.

[0054] When the collection bottle 4 is horizontally supported on the first horizontal plate 6, the collection bottle 4 is positioned between the ends of the two limiting strips 9 facing away from the vertical plate 5. Then, the collection bottle 4 is moved horizontally on the first horizontal plate 6 toward the vertical plate 5 until the collection bottle 4 is positioned between the two limiting strips 9 and abuts against both limiting strips 9. At this time, the mouth of the collection bottle 4 can face the groove 8 upwards, which makes it relatively convenient to make the mouth of the collection bottle 4 face the groove 8 upwards.

[0055] In this embodiment, the pressing part includes a second horizontal plate 10 and a helical spring 11. The second horizontal plate 10 is fixed on the vertical plate 5 and located above the pressure plate 1. The upper end of the helical spring 11 is fixedly connected to the second horizontal plate 10 and the lower end is fixedly connected to the pressure plate 1.

[0056] As the pressure plate 1 moves upward, it compresses the helical spring 11. After the collection bottle 4 is horizontally supported on the first horizontal plate 6, the helical spring 11 can push the pressure plate 1 downward through its own elastic force, causing the pressure plate 1 to move downward and press against the upper end of the collection bottle 4, closing the bottle opening. The helical spring 11 provides the pressure plate 1 with a downward force to hold the collection bottle 4. With this structure, the holding part can push the pressure plate 1 downward, so that the pressure plate 1 presses against the collection bottle 4 on the support and closes the bottle opening at the upper end of the collection bottle 4.

[0057] In this embodiment, a hole is formed on the second horizontal plate 10; the pressing part also includes a pull rod 12, the lower end of the pull rod 12 is fixedly connected to the pressure plate 1, and the upper end of the pull rod 12 passes upward through the hole and is located above the second horizontal plate 10.

[0058] Pull the upper end of the lever 12 and pull it upwards. The lever 12 can then pull the pressure plate 1 upwards, making it convenient to move the pressure plate 1 upwards.

[0059] Example 2

[0060] The difference between this embodiment and Embodiment 1 is that the bracket further includes a sealing gasket 13 fixed on the upper side wall of the groove 8, while the rest is the same as in Embodiment 1.

[0061] For details, please refer to Figure 5-6 The bracket further includes a sealing gasket 13 fixed to the upper side wall of the groove 8. The sealing gasket 13 cooperates with the groove 8. A first through hole is formed on the sealing gasket 13 at the position corresponding to the inlet pipe 2, and a second through hole is formed on the sealing gasket 13 at the position corresponding to the outlet pipe 3, which cooperates with the outlet pipe 3. The lower end of the inlet pipe 2 is located in the first through hole, and the lower end of the outlet pipe 3 is located in the second through hole.

[0062] When the pressure plate 1 is pressed onto the collection bottle 4, the mouth of the collection bottle 4 is positioned within the groove 8, and the mouth of the collection bottle 4 abuts against the sealing gasket 13, which closes and seals the mouth of the collection bottle 4. When using a water sample filter with the collection bottle connection structure described in this invention to filter water samples, the amount of air entering the collection bottle 4 from the gap between the groove wall of the groove 8 and the mouth of the collection bottle 4 can be reduced.

[0063] Example 3

[0064] The difference between this embodiment and Embodiment 1 is that the structure of the pressing part is different, while the rest are the same as in Embodiment 1.

[0065] For details, please refer to Figure 7-8 The pressing part includes a counterweight 14, which is fixed on the pressure plate 1.

[0066] As the pressure plate 1 moves upward, it drives the counterweight 14 to move upward as well. After the collection bottle 4 is horizontally supported on the first horizontal plate 6, the counterweight 14 can push the pressure plate 1 downward by its own weight, causing the pressure plate 1 to move downward and press against the upper end of the collection bottle 4, thus sealing the bottle opening. The counterweight 14 provides a downward force to the pressure plate 1 to hold the collection bottle 4. With this structure, the holding part can also push the pressure plate 1 downward, so that the pressure plate 1 presses against the collection bottle 4 on the support and seals the bottle opening at the upper end of the collection bottle 4.

[0067] Example 4

[0068] This utility model also provides another technical solution: a water sample filtration device, which includes the above-mentioned collection bottle connection structure.

[0069] Finally, it should be noted that 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 preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A liquid collecting bottle connection structure, characterized in that: The device includes a support, a pressure plate, an inlet pipe, an outlet pipe, and a holding part. The support is used to fix the device to the main body of the water sample filter and to horizontally support the collection bottle. The pressure plate is slidably mounted on the support. The inlet pipe and the outlet pipe are both fixed on the pressure plate. The lower ends of the inlet pipe and the outlet pipe pass through the pressure plate and are located on the lower side of the pressure plate. The holding part is used to push the pressure plate downward so that the pressure plate presses down on the collection bottle on the support and closes the bottle opening at the upper end of the collection bottle.

2. The liquid collecting bottle connection structure according to claim 1, characterized in that: The support includes a vertical plate and a first horizontal plate. The back of the vertical plate is used to fix it to the main body of the water sample filter. The first horizontal plate is fixed to the front of the lower end of the vertical plate and is arranged in a horizontal direction. The pressure plate is located above the first horizontal plate and can be slidably mounted on the vertical plate.

3. The liquid collecting bottle connection structure according to claim 2, characterized in that: The front of the vertical plate protrudes to form a slide rail; the side of the pressure plate facing the vertical plate is recessed to form a slide groove, which slides in contact with the slide rail.

4. The liquid collecting bottle connection structure according to claim 2, characterized in that: The lower side of the pressure plate is recessed upward to form a groove that matches the mouth of the collection bottle. The lower ends of the inlet pipe and the outlet pipe are both located in the groove. The minimum distance between the lower edge of the inlet pipe and the edge of the groove, and the minimum distance between the lower edge of the outlet pipe and the edge of the groove, are both greater than the thickness of the bottle wall at the mouth of the collection bottle.

5. The liquid collecting bottle connection structure according to claim 4, characterized in that: The bracket also includes a sealing gasket fixed to the upper side wall of the groove. The sealing gasket cooperates with the groove. A first through hole is formed on the sealing gasket at the position corresponding to the inlet pipe, and a second through hole is formed on the sealing gasket at the position corresponding to the outlet pipe, which cooperates with the outlet pipe. The lower end of the inlet pipe is located in the first through hole, and the lower end of the outlet pipe is located in the second through hole.

6. The liquid collecting bottle connection structure according to claim 4, characterized in that: The bracket also includes two limiting strips, both of which are fixed to the upper side of the first horizontal plate. The distance between the ends of the two limiting strips facing the vertical plate is less than the diameter of the liquid collecting bottle, and the distance between the ends of the two limiting strips facing away from the vertical plate is greater than the diameter of the liquid collecting bottle. The two limiting strips form a figure-eight structure. When the liquid collecting bottle is located between the two limiting strips and abuts against both limiting strips, the bottle opening of the liquid collecting bottle faces upwards and directly into the groove.

7. The liquid collecting bottle connection structure according to claim 2, characterized in that: The pressing part includes a second horizontal plate and a helical spring. The second horizontal plate is fixed on the vertical plate and located above the pressure plate. The upper end of the helical spring is fixedly connected to the second horizontal plate and the lower end is fixedly connected to the pressure plate.

8. The liquid collecting bottle connection structure according to claim 7, characterized in that: The second horizontal plate has a hole; the pressing part also includes a pull rod, the lower end of which is fixedly connected to the pressure plate, and the upper end of which passes through the hole and is located above the second horizontal plate.

9. The liquid collecting bottle connection structure according to claim 1, characterized in that: The pressing part includes a counterweight block, which is fixed to the pressure plate.

10. A water sample filtration device, characterized in that: The liquid collection bottle connection structure includes any one of claims 1-9.

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