An apparatus and method for collecting bubbles on the surface of aquatic biological crusts

Abstract

The present invention discloses an aquatic biological crust surface bubble collection device and a collection method. The aquatic biological crust surface bubble collection device includes a central component, a gas storage component, and a gas collection component; the gas collection component includes a gas collection cover covering the water surface, the top of the gas collection cover is communicated with the gas storage component, and two elastic gauzes arranged at intervals up and down are provided at the lower opening; a distance sensor is fixedly arranged on the inner wall of the gas collection cover above the gauze, and the distance sensor can give an alarm when it is at a certain distance from the crust; there is a vibration motor between the two gauzes, and the vibration motor can drive the two gauzes to vibrate up and down. The device of the present invention can actively disturb through the vibration motor to break the bubble balance and make the gas overflow to realize the rapid collection of bubbles. At the same time, the structure of protecting the crust through the distance alarm and the elastic gauze has the advantages of light assembly, simple operation, and wide application range.

Description

Technical Field

[0001] The invention relates to the field of bubble collection, and in particular to a bubble collection device and a bubble collection method on the surface of aquatic biological crust. Background Art

[0002] At present, large patches of suspended aquatic crusts with porous structures have been found on the surface of polymetallic tailings drainage in South China. The aquatic crusts are composed of biological components and non-biological components, such as cyanobacteria, fungi, clay minerals, etc. Aquatic crusts have extremely strong heavy (metal) enrichment capabilities, and can float on the water surface through a porous special structure to intercept heavy (metal) pollution in tailings drainage, so that aquatic crusts have the ability to repair heavy (metal) pollution in tailings drainage. The existence of the porous special structure of aquatic crusts is closely related to bubbles. When the aquatic crusts grow well, there will be a large number of bubbles on the surface. Therefore, collecting the surface gas of aquatic crusts on the basis of maintaining the crust structure is of great significance for further research on aquatic crusts.

[0003] The crusts of aquatic organisms are suspended in the water surface in pieces. The crusts have loose structures and high water content, and a large number of small bubbles are attached to the surface of the crusts. Therefore, the device for collecting bubbles on the surface of aquatic organism crusts should be suitable for shallow water basins, and should avoid damaging the structure of aquatic organism crusts while quickly collecting bubbles and reducing losses.

[0004] The existing underwater bubble collection device takes a long time to collect gas. For example, the prior art (CN206146887U) discloses a device for collecting river bubbles to collect bubbles at the bottom of the river. The device for collecting river bubbles has a spoiler ball on a cross-river rope. The spoiler ball has several spikes. When the spoiler ball rotates under the action of the water flow, the spikes can expand and gather the bubble pressure at the bottom of the water to break the dynamic balance of the bubbles at the bottom of the water. The cross-river rope is required for long-term collection for 12-24 hours. The device for collecting river bubbles in the prior art cannot be used to collect bubbles on the surface of aquatic biological crusts. The spikes on the surface of the spoiler ball will destroy the soft structure of the crust, and the collection time is too long to meet the need for rapid collection of bubbles on the surface of aquatic biological crusts. Summary of the invention

[0005] The invention provides an aquatic organism crust bubble collection device and collection method to solve the technical problems of long bubble collection time, bubble loss and destruction of crust structure.

[0006] The present invention discloses an aquatic biological crust surface bubble collection device, which includes a central component, a gas storage component, and a gas collection component. The gas collection component includes a gas collection hood covering the water surface. The top of the gas collection hood is connected to the gas storage component, and two elastic meshes arranged at intervals up and down are provided at the lower opening. A distance sensor is fixedly arranged on the inner wall of the gas collection hood above the meshes. The distance sensor can give an alarm when it is at a certain distance from the crust. There is a vibration motor between the two meshes, and the vibration motor can drive the two meshes to vibrate up and down.

[0007] As a preferred solution, the edges of the two meshes are both pasted on the inner wall of the gas collection hood.

[0008] As a preferred solution, the distance alarm includes a laser distance sensor, an active buzzer module group electrically connected to the laser distance sensor, and a switch electrically connected to both the laser distance sensor and the active buzzer module group. The switch is arranged outside the gas collection hood.

[0009] As a preferred solution, a third upper interface is provided at the upper part of the gas collection hood, and a third lower interface is provided at the side part of the gas collection hood. A second upper interface is provided at the side part of the gas storage bottle, a second lower interface is provided at the lower part of the gas storage bottle, and a balance air pressure port is provided at the upper part of the gas storage bottle. The central component is vertically fixedly provided with a hollow tube. A first lower interface communicating with the hollow tube is fixedly provided at the lower part of the hollow tube, and a first upper interface communicating with the hollow tube is fixedly provided at the upper part of the hollow tube. A power supply, a water outlet pipe, a water pump motor, and a water inlet pipe are also arranged in the hollow tube. The water inlet pipe is inserted below the water surface. The third upper interface is connected to the second lower interface, and the third lower interface is connected to the first lower interface. The water outlet pipe passes through the first upper interface and is connected to the second upper interface.

[0010] As a preferred solution, the third lower interface is threadedly connected to the first lower interface, and a channel communicating the hollow tube and the gas collection hood is reserved at the first lower interface.

[0011] As a preferred solution, the central component further includes a telescopic rod fixedly connected to the hollow tube.

[0012] As a preferred solution, the telescopic rod uses a locking device to fix the relative position after telescoping.

[0013] As a preferred solution, a control switch electrically connected is arranged on the upper surface of the telescopic rod. The control switch is electrically connected to the power supply and the water pump motor.

[0014] As a preferred solution, a stable disc is arranged outside the hollow tube. The stable disc is supported by a right-angle fixator and can rotate 90° to be close to the hollow tube.

[0015] The collection method using the aquatic biological crust surface bubble collection device of the present invention includes the following steps:

[0016] S1: Rubber hoses are used to connect between the second upper interface of the gas storage component and the first upper interface of the central component, and between the second lower interface of the gas storage component and the third upper interface of the gas collection component. A threaded connection is used between the first lower interface of the central component and the third lower interface of the gas collection component to complete the installation of the central component, gas storage component, and gas collection component;

[0017] S2: After the collection device is installed, immerse the water inlet pipe and the gas collection cover in water, click the control switch to start the water pump motor, keep the water inlet pipe and the gas collection cover always below the water surface, continuously pump water until both the gas storage bottle and the gas collection cover are filled with water and the balanced air pressure port gushes water evenly, use a rubber stopper to block the balanced air pressure port, and click the control switch again to stop pumping water;

[0018] S3: Turn on the distance alarm, move the gas collection cover above a large number of bubbles, slowly approach the crust. When hearing the "beep" sound from the distance alarm, click the control switch to start collecting gas. During collection, the vibration motor will drive the screen to vibrate to disturb the bubbles. The vibration motor has two gears with gradually increasing intensities. After the gas collection is completed, click the control switch again to stop gas collection;

[0019] S4: After the gas storage component completes the gas collection process, use an iron clamp to clamp the two rubber hoses connecting the second upper interface and the second lower interface of the gas storage bottle, and then disassemble the gas storage component, central component, and gas collection component;

[0020] S5: Move the gas storage bottle below the water surface, remove the rubber hose at the second lower interface, and plug in a rubber stopper; then invert the gas storage bottle so that the gas is at the second lower interface, remove the rubber hose at the second upper interface, and plug in a rubber stopper to complete gas collection.

[0021] In an embodiment of the present invention, an aquatic organism crust surface bubble collection device has the following beneficial effects compared with the prior art: The present invention includes a central component, a gas storage component, and a gas collection component. The three components are detachably connected, which is convenient for assembly and easy to carry. The gas collection component includes a gas collection cover covering the water surface. The top of the gas collection cover is connected to the gas storage component, and the lower part is provided with two elastic mesh screens arranged at intervals up and down. The mesh screens have a certain elasticity and can protect the crust structure when collecting bubbles. A distance sensor is fixedly arranged on the inner wall of the gas collection cover above the mesh screen. The distance sensor can issue an alarm when it is at a certain distance from the crust, actively prompting the distance between the device of the present invention and the crust structure. Therefore, when collecting gas, the distance between the device of the present invention and the crust structure can be adjusted by the prompt of the distance alarm. The distance alarm can be combined with the passive protection of the elastic mesh screen to achieve double protection of the crust structure, effectively reducing the damage to the crust structure when collecting bubbles. There is a vibration motor between the two mesh screens. The vibration motor can drive the two mesh screens to vibrate up and down, thereby actively disturbing and breaking the bubble balance to make the gas overflow for rapid collection. Therefore, the hand-held electric surface bubble collection device has high bubble collection efficiency and can be used for rapid field sampling.

[0022] In the present invention, the telescopic rod of the central component can adjust the sampling device height, providing convenience for sampling, being applicable to sampling at different depths, eliminating the need for the sampling personnel to bend down for a long time and manually stir the bubbles, and reducing the workload of the sampling personnel.

[0023] The present invention provides a bubble collection device that can collect gas in the surface area of water flow, with rapid collection, less bubble loss, and low damage to the crust structure. It consists of three parts: a central component, a gas storage component, and a gas collection component, with convenient assembly, light weight for carrying, simple use, long service life, and wide applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is the front view of the device in the embodiment of the present invention;

[0025] Figure 2 It is the front view of the central component in the embodiment of the present invention;

[0026] Figure 3 It is the side view of the central component in the embodiment of the present invention;

[0027] Figure 4 It is the top view of the central component in the embodiment of the present invention;

[0028] Figure 5 It is the front view of the gas storage component in the embodiment of the present invention;

[0029] Figure 6 It is the front view of the gas collection component in the embodiment of the present invention;

[0030] Figure 7Top view of the gas collection component for the embodiments of the present invention;

[0031] In the figure, 1 is the central component; 11 is the aluminum alloy hollow tube; 12 is the telescopic rod; 13 is the stable disc; 111 is the power supply; 112 is the first upper interface; 113 is the water outlet pipe; 114 is the micro water pump motor; 115 is the water inlet pipe; 116 is the first lower interface; 121 is the control switch; 122 is the anti-slip lock block;

[0032] 2 is the gas storage component; 21 is the gas storage cylinder; 211 is the second upper interface; 212 is the second lower interface; 213 is the balanced air pressure port;

[0033] 3 is the gas collection component; 31 is the gas collection cover; 32 is the distance alarm; 33 is the screen; 34 is the oscillation motor; 311 is the third upper interface; 312 is the third lower interface. Specific embodiments

[0034] The following will further describe in detail the specific embodiments of the present invention in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0035] As Figure 1 shown, a bubble collection device for the surface of aquatic biological crusts in a preferred embodiment of the embodiments of the present invention includes a central component 1, a gas storage component 2, and a gas collection component 3.

[0036] Among them, the gas collection component 3 includes a gas collection cover 31 covering the water surface. The widest diameter of the gas collection cover 31 is 25 cm, the height is 10 cm, and the overall height is 15 cm, including an interface with a height of 1 cm, and its material is polystyrene. The interface with a diameter of 1 cm at the top of the gas collection cover 31 is connected to the gas storage component 2 using a rubber tube. The lower opening is provided with two elastic screens 33 arranged at an upper and lower interval distance less than 0.5 cm. The screen 33 is 20-mesh polyester fiber and is fixed in the gas collection cover 31 by AB glue. The screen 33 has elasticity and can protect the fragile structure of the crust when collecting bubbles; a laser distance sensor 32 is fixedly arranged on the inner wall of the gas collection cover 31 5 cm above the screen 33. The size of the distance sensor 32 is 4.5 cm * 3.8 cm * 1.5 cm, the measurement accuracy is 0.1 cm, and the minimum ranging distance is 5 cm. The distance sensor 32 can issue an alarm when it is at a certain distance from the crust to prompt the distance between the gauze 33 and the crust, so as to avoid damaging the crust structure; the oscillation motor 34 can drive the two screens 33 to vibrate up and down, actively disturbing to break the bubble balance so as to achieve the purpose of collecting bubbles.

[0037] The device for collecting river bubbles in the prior art uses a spoiler ball. When the spoiler ball rotates under the action of water flow, the spike part can expand and aggregate the pressure of the bubbles at the bottom of the water, so as to break the dynamic balance of the bubbles at the bottom of the water. It requires a cross-river rope for long-time collection for 12 - 24 hours. The long collection time cannot meet the need for rapid collection of bubbles on the surface of aquatic biological crusts, and the spike part on the surface of the spoiler ball will damage the soft structure of the crust. The device for collecting bubbles on the surface of aquatic biological crusts provided by the present invention can use a vibration motor to drive the screen to vibrate to achieve the effect of actively disturbing and breaking the bubble balance, realizing the purpose of rapid collection, and the distance alarm and the screen provide double protection for the bubble structure.

[0038] Among them, the edges of the two screens 33 are both pasted on the inner wall of the gas collection cover. The operation of pasting the screen 33 is simple and convenient for subsequent replacement.

[0039] Among them, the distance alarm 32 includes a laser ranging sensor, an active buzzer module group electrically connected to the laser ranging sensor, and a switch electrically connected to both the laser ranging sensor and the active buzzer module group at the same time. The distance alarm 32 has its own power supply, and the switch is arranged outside the gas collection cover for convenient control during collection.

[0040] Among them, as Figure 1 shown, a third upper interface 311 with a diameter of 1 cm is provided at the upper part of the gas collection cover 31, and a third lower interface 312 with a diameter of 1 cm is provided at the side part of the gas collection cover 31; a second upper interface 211 is provided at the side part of the gas storage cylinder 21, a second lower interface 212 is provided at the lower part of the gas storage cylinder 21, and a balance air pressure port 213 is provided at the upper part of the gas storage cylinder 21; the central component 1 includes a 4 cm * 4 cm hollow tube 11 vertically fixed to the telescopic rod 12. A first lower interface 116 with a diameter of 1 cm communicated with the hollow tube 11 is fixedly provided at the lower part of the hollow tube 11, and a first upper interface 112 with a diameter of 1 cm communicated with the hollow tube 11 is fixedly provided at the upper part of the hollow tube 11. A power supply 111, a water outlet pipe 113, a water pump motor 114, and a water inlet pipe 115 are further arranged in the hollow tube 11, and the water inlet pipe 115 is inserted below the water surface; the third lower interface 312 and the first lower interface 116 are connected; the second upper interface 211 and the second lower interface 212 are respectively connected to the water outlet pipe 113 passing through the first upper interface 112 and the third upper interface 311 by rubber tubes. The diameter of the rubber tube should be slightly smaller than the diameter of the interface to ensure airtightness.

[0041] Among them, the third lower interface 312 is threadedly connected to the first lower interface 116. Threaded connection facilitates the installation and disassembly of the gas collection hood 21, and can also make the connection between the gas collection hood 21 and the hollow tube 11 more stable; a channel connecting the hollow tube 11 and the gas collection hood 31 is reserved in the first lower interface, enabling the shock motor 34 and the power supply 111 to be connected by wires.

[0042] Among them, the central component 1 further includes a telescopic rod 12 with a diameter of 4 cm fixedly connected to the hollow tube 11. The shortest length of the telescopic rod 12 is 60 cm, and the longest can reach 100 cm. The telescopic rod 12 is provided with an anti-slip lock block 122 to fix the relative position after stretching or shortening. When the telescopic rod 12 extends or shortens, the anti-slip lock block locks at the intersection of the two rods to fix the length of the telescopic rod. The anti-slip lock block can be adjusted at any time, which is suitable for collecting air bubbles in the wild.

[0043] Among them, a control switch 121 with electrical signal connection is arranged on the upper surface of the telescopic rod 12. The control switch 121 includes a "pumping water" button and a "gas collection" button; the control switch 121 is electrically signal-connected to the power supply 111 and the water pump motor 114, enabling the control switch 121 to control the water pump motor 114 and the shock motor 34 to achieve the purpose of evacuating the air in the gas storage cylinder and collecting gas.

[0044] Among them, an aluminum alloy stable disc 13 is arranged outside the hollow tube 11. The aluminum alloy stable disc 13 is supported by a right-angle fixer and can rotate 90° to be close to the hollow tube 11.

[0045] Among them, the gas storage component 2 includes a gas storage cylinder 21. The widest diameter of the gas storage cylinder 2 is 6 cm, and the overall height is 10 cm. The gas storage cylinder 21 is placed on the aluminum alloy stable disc 13 to fix the gas storage component 2.

[0046] The working process of the present invention is as follows:

[0047] As Figure 1 shown, immerse the aquatic biological crust surface bubble collection device in water, so that the water inlet pipe 115 and the gas collection hood 31 of the central component 1 are immersed in water. Click the "pumping water" button, and the water flows into the gas storage cylinder 21 through the water pump 114. Until the gas storage cylinder 21 and the gas collection hood 31 are both filled with water (that is, water gushes out evenly from the balanced air pressure port 213), use a rubber plug to block the balanced air pressure port 213. The rubber plug seals to keep the gas storage device 2 in a gas-free state, and then gas collection can start. Click the "pumping water" button again to stop pumping water, turn on the distance alarm 32, and at this time, it should be ensured that the gas collection hood 31 and the water inlet pipe 115 are always below the liquid level.

[0048] As Figure 4 、 Figure 6 、 Figure 7As shown, the distance sensor 32 is installed 5 cm above the gauze 33 at the bottom of the gas collection hood 31. When the distance between the gauze and the crust is 1.5 cm, it emits a "beep". When the distance is between 0.5 cm and 1.5 cm, there is no sound. When the distance is less than 0.5 cm, it emits a "beep beep beep" alarm sound. Keep the gas collection hood 31 and the water inlet pipe 115 below the liquid level, move the gas collection hood 31 above a large number of bubbles, and slowly approach the crust. When hearing the "beep", click the "Gas Collection" button to start collecting gas. The oscillation motor 34 will drive the gauze 33 to vibrate to disturb the bubbles, with two gears increasing sequentially, so as to achieve efficient and rapid gas collection without damaging the crust tissue of aquatic organisms at the same time. After the collection is completed, press the "Gas Collection" button again to stop gas collection. If the "beep beep beep" sounds at any time during the process, the device needs to be slowly lifted up to restore to a state where the distance sensor 32 does not alarm, and then collect gas again. If it is necessary to change the sampling position, still keep the gas collection hood 31 and the water inlet pipe 115 below the liquid level, and repeat the above operations to complete gas collection.

[0049] As Figure 5 As shown, after the gas storage component 2 completes the gas collection process, use an iron clamp to clamp the two rubber hoses connected to the gas storage bottle 21 to prevent air leakage, and then separate the gas storage component 2 from the central component 1 and the gas collection component 3. Move the gas storage bottle 21 below the water surface, remove the rubber hose at the second lower interface 212, and plug in a rubber stopper; invert the gas storage bottle 21 so that the gas is at the second lower interface 212, remove the rubber hose at the second upper interface 211, and plug in a rubber stopper to complete gas collection.

[0050] In summary, the embodiment of the present invention provides an aquatic organism crust bubble collection device and a collection method, which can actively disturb and break the bubble balance through the oscillation motor to make the gas overflow and achieve rapid collection, with high collection efficiency and suitable for field collection; while collecting gas, the alarm prompts to reduce the loss of bubbles and the damage to the crust structure, protecting the original appearance of the sample; and the bubble collection device of the present invention is easy to install, portable, simple to operate, has a long service life, and a wide range of applications.

[0051] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and replacements can still be made, and these improvements and replacements should also be regarded as the protection scope of the present invention.

Claims

1. An aquatic organism crust surface bubble collection device, characterized in that: It includes a central component (1), a gas storage component (2), and a gas collection component (3); The gas collection component (3) includes a gas collection hood (31) covering the water surface. The top of the gas collection hood (31) is connected to the gas storage component (2), and two elastic gauze nets (33) are arranged at intervals up and down at the lower opening. The interval distance between the two gauze nets (33) is less than 0.5 cm; A distance sensor (32) is fixedly arranged on the inner wall of the gas collection hood above the gauze net (33). The distance sensor (32) can give an alarm when it is at a certain distance from the crust; There is a vibration motor (34) between the two gauze nets (33). The vibration motor (34) can drive the two gauze nets (33) to vibrate up and down.

2. The aquatic organism crust surface bubble collection device according to claim 1, wherein: The edges of the two gauze nets (33) are both pasted on the inner wall of the gas collection hood (31).

3. The aquatic organism crust surface bubble collection device according to claim 1, characterized in that: The distance sensor (32) includes a laser distance sensor, an active buzzer module group electrically connected to the laser distance sensor, and a switch electrically connected to both the laser distance sensor and the active buzzer module group. The switch is arranged outside the gas collection hood (31).

4. The aquatic organism crust surface bubble collection device according to claim 1, characterized in that: The upper part of the gas collection hood (31) is provided with a third upper interface (311), and the side part of the gas collection hood (31) is provided with a third lower interface (312); The gas storage component (2) includes a gas storage bottle (21). The side part of the gas storage bottle (21) is provided with a second upper interface (211), the lower part of the gas storage bottle (21) is provided with a second lower interface (212), and the upper part of the gas storage bottle (21) is provided with a balanced air pressure port (213); The central component (1) is vertically fixedly provided with a hollow tube (11). The lower part of the hollow tube (11) is fixedly provided with a first lower interface (116) communicating with the hollow tube (11). The upper part of the hollow tube (11) is fixedly provided with a first upper interface (112) communicating with the hollow tube (11). A power supply (111), a water outlet pipe (113), a water pump motor (114), and a water inlet pipe (115) are also arranged in the hollow tube (11). The water inlet pipe (115) is inserted below the water surface; The third upper interface (311) is connected to the second lower interface (212), and the third lower interface (312) is connected to the first lower interface (116); The water outlet pipe (113) passes through the first upper interface (112) and is connected to the second upper interface (211).

5. The aquatic organism crust surface bubble collection device according to claim 4, wherein: The third lower interface (312) is threadedly connected to the first lower interface (116). The first lower interface reserves a channel for communicating the hollow tube (11) and the gas collection hood (31).

6. The aquatic organism crust surface bubble collection device according to claim 4, wherein: The central component (1) further includes a telescopic rod (12) fixedly connected to the hollow tube (11).

7. The aquatic organism crust surface bubble collection device according to claim 6, characterized in that: The telescopic rod (12) uses a locking device to fix the relative position after telescoping.

8. The aquatic organism crust surface bubble collection device according to claim 6, characterized in that: A control switch (121) electrically connected is arranged on the upper surface of the telescopic rod (12); the control switch (121) is electrically connected to the power supply (111) and the water pump motor (114).

9. The aquatic organism crust surface bubble collection device according to claim 4, wherein: A stabilizing disc (13) is provided outside the hollow tube (11). The stabilizing disc (13) is supported by a right-angle holder and can be rotated 90° to be close to the hollow tube (11).

10. A collection method using the aquatic organism crust surface bubble collection device described in claim 8, characterized in that, It includes the following steps: S1: Rubber hoses are used to connect between the second upper interface (211) of the gas storage component (2) and the first upper interface (112) of the central component (1), and between the second lower interface (212) of the gas storage component (2) and the third upper interface (311) of the gas collection component (3). A threaded connection is used between the first lower interface (116) of the central component (1) and the third lower interface (312) of the gas collection component (3) to complete the installation of the central component (1), the gas storage component (2), and the gas collection component (3). S2: After the collection device is installed, the water inlet pipe (115) and the gas collection hood (31) are immersed in water. Click the control switch (121) to start the water pump motor (114), and keep the water inlet pipe (115) and the gas collection hood (31) always below the water surface. Continuously pump water until both the gas storage bottle (21) and the gas collection hood (31) are filled with water and the balanced air pressure port (213) gushes water evenly. Use a rubber stopper to block the balanced air pressure port (213), and click the control switch (121) again to stop pumping water. S3: Turn on the distance sensor (32), move the gas collection hood (31) above a large number of bubbles, and slowly approach the crust. When hearing the "beep" sound from the distance sensor (32), click the control switch (121) to start collecting gas. When collecting gas, the oscillation motor (34) will drive the wire mesh (33) to vibrate to disturb the bubbles. The oscillation motor (34) has two gears with gradually increasing intensities. After the gas collection is completed, click the control switch (121) again to stop gas collection. S4: After the gas storage component (2) completes the gas collection process, use iron clamps to clamp the two rubber hoses connecting the second upper interface (211) and the second lower interface (212) of the gas storage bottle (21), and then disassemble the gas storage component (2), the central component (1), and the gas collection component (3). S5: Move the gas storage bottle (21) below the water surface, remove the rubber hose at the second lower interface (212), and plug in a rubber stopper; then invert the gas storage bottle (21) so that the gas is at the second lower interface (212), remove the rubber hose at the second upper interface (211), and plug in a rubber stopper to complete gas collection.

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