Water temperature monitoring extraction simulation device based on coal mine terrestrial heat

Abstract

The invention provides a water temperature monitoring extraction simulation device based on coal mine terrestrial heat, and belongs to the technical field of terrestrial heat. Comprising a tank body, an inner cavity is formed in the tank body, three isolation plates are fixedly connected to the interior of the inner cavity and divide the inner cavity into three cavity bodies, a containing box with the top open is arranged in each cavity body, a prefabricated sample is placed in each containing box, and a plurality of temperature sensors are preset in each prefabricated sample; and a vibration assembly is arranged outside the tank body. According to the invention, through the isolation plate and the plurality of pressure applying assemblies, in cooperation with the elastic rods with different heights, multi-element stress environments of coal mines with different depths can be simulated at the same time, the device is more suitable for actual stratum difference, the lifting assembly actively controls water permeation, the dynamic infiltration process of underground water is accurately restored, static water replenishing is prevented from being disjointed with the actual situation, and the device is more practical. The vibration assembly enables water in sample gaps to be evenly distributed through vibration, local accumulation or vacancy of the water is prevented, and the accuracy and reliability of water temperature monitoring data are improved.

Description

Technical Field

[0001] This invention relates to the field of geothermal technology, and in particular to a water temperature monitoring and extraction simulation device based on coal mine geothermal energy. Background Technology

[0002] In coal mining operations, the geothermal environment is one of the key factors affecting mining safety and efficiency. As the mining depth increases, the temperature of the underground rock strata gradually rises, and the heat exchange between groundwater and the rock strata further alters the local geothermal field distribution. After groundwater seeps into the rock strata fissures, it may absorb heat from the rock strata, causing its own temperature to rise, or it may affect the temperature of the surrounding rock strata through heat conduction. This can lead to safety hazards such as thermal stress deformation of the well wall and high-temperature failure of equipment, and it can also affect the rational extraction and utilization of geothermal resources in coal mines.

[0003] Chinese patent application CN201711118444.5 discloses a geothermal resource extraction simulation experimental device, including a formation simulation cavity, a rock pressing device, a hydrothermal vent collection device, a heat source system, a temperature monitoring device, and a lateral pressure device. The rock used in the experiment is pressed layer by layer in the formation simulation cavity using the aforementioned rock pressing device. The hydrothermal vent collection device includes a U-shaped vent pipe and a high-temperature pump. The U-shaped vent pipe is laid after the rock is pressed, and the U-shaped vent pipe is connected to the high-temperature pump through a high-temperature pipe. The lateral pressure device applies pressure to the prepared rock, the aforementioned heat source system provides heat to the rock in the formation simulation cavity, and the temperature monitoring device monitors the impact of hydrothermal extraction on the temperature distribution of the rock strata. This invention more accurately simulates the structure and stress conditions of geological rock strata, resulting in more accurate and reliable experimental data. Existing related devices produce distorted simulations of groundwater infiltration. In coal mines, groundwater often seeps dynamically through rock fissures, while existing devices mostly use static water replenishment methods, failing to replicate the natural infiltration process of water in rock fissures. This leads to water temperature monitoring results that do not reflect the temperature change patterns under actual infiltration conditions. Furthermore, it lacks multi-depth pressure simulation. The pressure differences in rock strata at different depths in coal mines are significant, directly affecting the heat exchange efficiency between groundwater and rock strata. Existing devices mostly use single-pressure environment simulation, failing to simultaneously compare pressure and water temperature correlation data at different depths, resulting in low experimental efficiency and a disconnect from actual working conditions. Finally, it ignores the impact of vibration. Continuous vibrations during coal mining cause uneven water distribution within rock fissures, interfering with water temperature monitoring data. Existing devices lack specific vibration simulation components, failing to eliminate this factor's interference with experimental results.

[0004] Therefore, this application provides a water temperature monitoring and extraction simulation device based on coal mine geothermal energy to meet the requirements. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a water temperature monitoring and extraction simulation device based on geothermal energy in coal mines, so as to solve the problems of low fit and insufficient data accuracy of traditional simulation devices.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A water temperature monitoring and extraction simulation device based on geothermal energy in coal mines includes a tank with an internal cavity. Three partition plates are fixedly connected inside the internal cavity, dividing it into three chambers. Each chamber contains a top-open placement box containing a pre-fabricated sample. Several temperature sensors are pre-installed inside the pre-fabricated sample. A vibration assembly is located outside the tank, and a mounting plate is fixedly connected inside the tank. A lifting assembly is mounted on the mounting plate, and a pressure application assembly is located at the bottom of the lifting assembly. Each placement box has elastic rods of different heights at its bottom. The vertical height of each elastic rod is higher than the sample; the lifting assembly is located at the top of the tank and is used to squeeze water into the rock crevices to simulate the real scenario of the sample being infiltrated by groundwater; there are three vibration assemblies, each corresponding to a placement box, which are used to vibrate the sample to ensure that the groundwater in the sample crevices is more uniform; there are three sets of pressure application assemblies, each corresponding to a placement box, which are used to apply different pressures to the samples in different placement boxes to simulate the different pressures experienced by samples at different depths.

[0007] Optionally, the tank body is provided with three sealing doors, which are located between the inner cavity and the mounting plate.

[0008] Optionally, the vibration assembly includes a mounting box installed outside the tank, a linear direct drive motor installed inside the mounting box, a drive shaft connected to the drive end of the linear direct drive motor, the end of the drive shaft passing through the tank and the inner cavity into the placement box, and a vibration plate installed at the end of the drive shaft.

[0009] Optionally, a sealing connection is installed between the drive shaft and the tank, the inner cavity, and the placement box.

[0010] Optionally, the tank body is provided with observation windows through which the placement box can be observed. There are three observation windows, which are located next to the installation box. The part of the placement box facing the observation windows is made of tempered glass.

[0011] Optionally, the lifting assembly includes a stepper motor mounted on a mounting plate. The drive end of the stepper motor is driven by a threaded rod, and a slider is threadedly connected to the threaded rod. A sealing piston is mounted on the slider.

[0012] Optionally, the threaded rod is vertically disposed through the mounting plate, and the slider slides up and down between the top of the inner cavity and the bottom of the mounting plate.

[0013] Optionally, the pressure application assembly includes an electric telescopic rod, the fixed end of which is installed at the bottom of the sealing piston. The telescopic end of the electric telescopic rod is fixedly connected to a drive plate. Three connecting rods are fixedly connected to the bottom of the drive plate. Each connecting rod is fixedly connected to a pressure plate at its bottom. A vent hole one is provided on the pressure plate. A function box is provided at the bottom of the pressure plate. The function box is located at the bottom of the vent hole one. A vent hole two is provided on the upper side of the function box.

[0014] Optionally, a guide rod is vertically arranged inside the functional box, and a slider is slidably connected to the guide rod. A through hole is provided at the bottom of the functional box, which can accommodate the passage of the elastic rod.

[0015] Optionally, when the second slider is located at the bottom of the functional box, it can block the through hole; when the second slider is located at the top of the functional box, it can block the first vent and the second vent.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects: In the above scheme, by setting up a lifting component, the sealed piston of the lifting component is used to squeeze the water and actively push the water into the cracks of the rock sample. This accurately restores the dynamic infiltration process of groundwater in the underground rock strata. Unlike the traditional static water replenishment method, this ensures that the experimental scenario is consistent with the natural infiltration law of groundwater in coal mines, and makes the water temperature monitoring data more reflective of real geothermal changes.

[0017] By incorporating vibration components, each corresponding to a placement box, a linear direct-drive motor drives the vibration plate to vibrate the sample. This not only replicates the natural vibration state of underground rock strata but also promotes the even distribution of moisture within the sample crevices, preventing monitoring deviations caused by localized moisture accumulation or gaps. This further enhances the realism of the simulated scenario. Inspectors can observe the condition of the rock sample through the viewing window and promptly replace any damaged samples.

[0018] By incorporating a pressure-applying component and dividing the space into independent chambers using three partition plates, along with elastic rods at varying heights at the bottom, the system can simultaneously simulate the stress environment of coal mines at different depths. The higher the elastic rod, the lower the pressure on the rock samples and water within the corresponding chamber, simulating a shallow environment; conversely, the lower the elastic rod, the greater the pressure on the rock samples and water, simulating a deep environment. This comprehensive approach covers diverse geological formations, preventing the simulation of a single environment from becoming disconnected from actual geothermal scenarios in coal mines, and providing a more realistic experimental basis for subsequent monitoring. Attached Figure Description

[0019] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the invention and, together with the specification, further serve to explain the principles of the invention and enable those skilled in the art to practice and use the invention.

[0020] Figure 1 This is a schematic diagram of a three-dimensional structure of a water temperature monitoring and extraction simulation device based on geothermal energy in coal mines. Figure 2 This is a cross-sectional view of a water temperature monitoring and extraction simulation device based on geothermal energy in coal mines. Figure 3 This is a three-dimensional structural diagram of the tank and the placement box; Figure 4 This is a schematic diagram of the three-dimensional structure of the vibration component; Figure 5 This is a three-dimensional structural diagram of the lifting assembly; Figure 6 A three-dimensional structural diagram of the pressure-applying component; Figure 7 A three-dimensional structural diagram of the pressure application components and the placement box; Figure 8 for Figure 7 Enlarged schematic diagram of the structure at point A in the diagram.

[0021] Figure label: 1. Tank body; 101. Inner cavity; 102. Isolation plate; 103. Mounting plate; 104. Sealing door; 2. Placement box; 3. Vibration assembly; 301. Mounting box; 302. Linear direct drive motor; 303. Drive shaft; 304. Vibration plate; 305. Sealing connector; 306. Observation window; 4. Lifting assembly; 401. Stepper motor; 402. Threaded rod; 403. Slider one; 404. Sealing piston; 5. Pressurizing assembly; 501. Electric telescopic rod; 502. Drive plate; 503. Connecting rod; 504. Pressure plate; 505. Vent one; 506. Function box; 5061. Vent two; 5062. Through hole; 5063. Guide rod; 5064. Slider two; 6. Elastic rod.

[0022] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0023] The following is a detailed description of a water temperature monitoring and extraction simulation device based on geothermal energy in coal mines provided by the present invention, with reference to the accompanying drawings and specific embodiments. It should be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments; those skilled in the art can also use other alternative methods to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0024] like Figures 1 to 8 As shown, an embodiment of the present invention provides a water temperature monitoring and extraction simulation device based on geothermal energy in coal mines, including a tank 1. The tank 1 has an inner cavity 101, and three partition plates 102 are fixedly connected inside the inner cavity 101, dividing it into three chambers. Each chamber contains a top-open placement box 2, which holds a pre-made sample. Several temperature sensors are pre-installed inside the pre-made sample. A vibration assembly 3 is installed outside the tank 1, and an mounting plate 103 is fixedly connected inside the tank 1. A lifting assembly 4 is installed on the mounting plate 103, and a pressure application assembly 5 is installed at the bottom of the lifting assembly 4. Each placement box 2 has elastic rods 6 at different heights at its bottom, with the vertical height of the elastic rods 6 all higher than the sample. The lifting assembly 4 is located at the top inside the tank 1 and is used to squeeze water into rock crevices to simulate the real scenario of groundwater infiltration into the sample. Three vibration assemblies 3 are provided, each corresponding to a placement box 2. The vibration assemblies 3 are used for... The vibration of the sample ensures that the groundwater in the sample crevice is more uniform. The pressure application component 5 is set in three groups, each corresponding to the placement box 2. The pressure application component 5 is used to apply different pressures to the samples in different placement boxes 2 to simulate the different pressures that samples at different depths are subjected to. The tank body 1 is equipped with three sealing doors 104, which are located between the inner cavity 101 and the mounting plate 103. Through the isolation plate 102 and multiple groups of pressure application components 5, in conjunction with elastic rods 6 of different heights, the diverse stress environment of coal mines at different depths can be simulated at the same time, which is more in line with the actual stratum differences and provides a real and diverse experimental basis for monitoring. The lifting component 4 actively controls water infiltration, accurately restores the dynamic infiltration process of groundwater, avoids the disconnect between static water replenishment and reality, and ensures that the water temperature monitoring data truly reflects the geothermal change law under the infiltration state. The vibration component 3 corresponds to the placement box 2 one by one. By vibration, the water in the sample crevice is evenly distributed, preventing local accumulation or gaps of water and improving the accuracy and reliability of the water temperature monitoring data.

[0025] like Figure 1 and Figure 4As shown, the vibration assembly 3 includes a mounting box 301 installed outside the tank 1. A linear direct-drive motor 302 is installed inside the mounting box 301. The drive end of the linear direct-drive motor 302 is connected to a drive shaft 303. The end of the drive shaft 303 passes through the tank 1 and the inner cavity 101 and enters the placement box 2. A vibration plate 304 is installed at the end of the drive shaft 303. A sealing connector 305 is installed between the drive shaft 303 and the tank 1, the inner cavity 101 and the placement box 2. The tank 1 is provided with three observation windows 306 that allow observation of the placement box 2. The observation windows 306 are located next to the mounting box 301. The part of the placement box 2 facing the observation windows 306 is made of tempered glass. The sealing connector 305 effectively prevents water leakage inside the cavity, ensuring that key parameters such as temperature and pressure are not disturbed by the outside during the experiment, maintaining the stability of the simulated environment, and ensuring the validity of the monitoring data. The observation windows 306 allow the experimenters to observe the sample vibration status and water penetration in real time, facilitating the timely replacement of damaged samples.

[0026] like Figures 5 to 8 As shown, the lifting assembly 4 includes a stepper motor 401, which is mounted on the mounting plate 103. The drive end of the stepper motor 401 is connected to a threaded rod 402, and a slider 403 is threadedly connected to the threaded rod 402. A sealing piston 404 is installed on the slider 403. The threaded rod 402 passes through the mounting plate 103 and is vertically arranged. The slider 403 slides up and down between the top of the inner cavity 101 and the bottom of the mounting plate 103. By installing the sealing piston 404 on the slider 403, a sealed space is formed with the top of the inner cavity 101 and the bottom of the mounting plate 103. The pressure loss is small when squeezing water, and the driving force of the lifting assembly 4 can be efficiently converted into the osmotic pressure of water, ensuring that water enters the rock crevices and restoring the real osmotic pressure environment.

[0027] like Figures 5 to 8As shown, the pressure application assembly 5 includes an electric telescopic rod 501. The fixed end of the electric telescopic rod 501 is installed at the bottom of the sealing piston 404. The telescopic end of the electric telescopic rod 501 is fixedly connected to a drive plate 502. Three connecting rods 503 are fixedly connected to the bottom of the drive plate 502. A pressure plate 504 is fixedly connected to the bottom of each connecting rod 503. A vent hole 505 is provided on the pressure plate 504. A function box 506 is provided at the bottom of the pressure plate 504. The function box 506 is located at the bottom of the vent hole 505. A second vent hole 5061 is provided on the upper side of the function box 506. A guide rod 5063 is vertically arranged inside the function box 506. A sliding connection is provided on the guide rod 5063. There is a slider 5064, and a through hole 5062 is provided at the bottom of the function box 506. The through hole 5062 can accommodate the passage of the elastic rod 6. When the slider 5064 is located at the bottom of the function box 506, it can block the through hole 5062. When the slider 5064 is located at the top of the function box 506, it can block the first vent 505 and the second vent 5061. Through the design of the function box 506 and the elastic rods 6 of different heights, the rock sample and water are subjected to less pressure in the placement box 2 with the largest elastic rod 6 height, and the rock sample and water are subjected to greater pressure in the placement box 2 with the smallest elastic rod 6 height, thereby simulating the effect of groundwater at different depths and different pressures on the temperature of the rock sample.

[0028] The working principle of the technical solution provided by this invention is as follows: Before the simulation test, the stepper motor 401 is controlled to raise the lifting component 4 and the pressure application component 5 together to the top of the tank 1, the side sealing door 104 is opened, the pre-made rock samples are placed into the three placement boxes 2 at the bottom, and an equal amount of water at the same temperature is injected into each placement box 2 to simulate the real scenario of groundwater entering the rock crevices. Then the sealing door 104 is closed, and the temperature change is recorded by the temperature sensor embedded in the rock sample.

[0029] Once ready, the stepper motor 401 drives the sealing piston 404 to move downwards along the threaded rod 402, causing the pressure application component 5 to move downwards. During the movement, the gas in the tank 1 enters the functional box 506 through the vent hole 505 on the pressure plate 504, and then enters the bottom of the pressure plate 504 through the vent hole 5061 on the side of the functional box 506. Since the pressure plate 504 forms a sealed area by tightly fitting with the inner wall of the placement box 2 after entering the placement box 2, the air pressure in the placement box 2 increases, which applies pressure to the water injected into the placement box 2, ensuring that the water enters the gaps of the rock sample and improving the accuracy of the rock sample temperature measurement.

[0030] After the sealing piston 404 descends to a certain distance, the stepper motor 401 is shut off. Then, the electric telescopic rod 501 is extended, causing the drive plate 502 at the moving end of the electric telescopic rod 501 to move downward. The three pressure plates 504 at the bottom of the drive plate 502 simultaneously enter different placement boxes 2. As the pressure plates 504 move downward, the elastic rod 6 enters the function box 506 through the through hole 5062 at the bottom of the function box 506 and pushes the second slider 5064 upward along the guide rod 5063, eventually contacting the lower surface of the pressure plate 504. At this time, the second slider 5064 blocks the vent hole. Since the elastic rods 6 at the bottom of each placement box 2 are at different heights and are all higher than the rock sample, the highest elastic rod 6 first pushes the slider 2 5064 to block the first ventilation hole 505 and the second ventilation hole 5061. The water in the placement box 2 where the highest elastic rod 6 is located experiences the least pressure. The vertical distance between the horizontal plane and the pressure plate 504 above the placement box 2 where the lowest elastic rod 6 is located is the smallest, and the water experiences the greatest pressure. This simulates the different pressures experienced by groundwater at different depths and tests the influence of groundwater at different depths on the temperature of the rock sample.

[0031] Similarly, since the elastic rods 6 at the bottom of each placement box 2 are of different heights and are all higher than the rock sample, the tallest elastic rod 6 first pushes the slider 5064 to contact the lower surface of the pressure plate 504. As the pressure plate 504 continues to move down, the elastic rod 6 is compressed, exerting a reverse force on the pressure plate 504 above, thereby reducing the pressure exerted by the pressure plate 504 on the rock sample. The shortest elastic rod 6 is compressed the least, so that the rock sample in its placement box 2 experiences the least pressure, thus simulating the different pressures experienced by rocks at different depths and testing the effect of different pressures on the temperature of the rock sample.

[0032] At the start of the experiment, the vibration component 3 is turned on synchronously, controlling the linear direct drive motor 302 to drive the drive shaft 303 to reciprocate. The vibration plate 304 at the end of the drive shaft 303 vibrates the rock sample. The sealing connector 305 effectively prevents water from leaking out of the placement box 2. On the one hand, it simulates the real underground vibration, and on the other hand, the vibration can make the water in the gaps of the rock sample more uniform. The testers can observe the condition of the rock sample through the observation window 306 and replace the damaged sample in time.

[0033] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0034] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A water temperature monitoring and extraction simulation device based on geothermal energy in coal mines, characterized in that, The container includes a tank (1), which has an inner cavity (101) inside. Three partition plates (102) are fixedly connected inside the inner cavity (101). The partition plates (102) divide the inner cavity (101) into three chambers. Each chamber is equipped with a top-open placement box (2). A pre-made sample is placed in the placement box (2). Several temperature sensors are preset inside the pre-made sample. A vibration component (3) is provided outside the tank (1). An installation plate (103) is fixedly connected inside the tank (1). A lifting component (4) is provided on the installation plate (103). A pressure application component (5) is provided at the bottom of the lifting component (4). Each placement box (2) is equipped with an elastic rod (6) of different height at the bottom. The vertical height of the elastic rod (6) is higher than that of the sample. The lifting assembly (4) is located at the top inside the tank (1). The lifting assembly (4) is used to squeeze water into the rock crevices to simulate the effect of groundwater at different depths on the temperature of the rock sample. The vibration component (3) is set to three, and each vibration component (3) corresponds to the placement box (2). The vibration component (3) is used to vibrate the sample to simulate the real underground vibration and to ensure that the groundwater in the sample gap is more uniform. The pressure application components (5) are set into three groups, and each group of pressure application components (5) corresponds one-to-one with the placement box (2). The pressure application components (5) are used to simulate the different pressures on rocks at different depths and test the effect of different pressures on the temperature of rock samples.

2. The water temperature monitoring and extraction simulation device based on geothermal energy in coal mines according to claim 1, characterized in that, The tank (1) is provided with three sealing doors (104), which are located between the inner cavity (101) and the mounting plate (103).

3. The water temperature monitoring and extraction simulation device based on geothermal energy in coal mines according to claim 2, characterized in that, The vibration assembly (3) includes a mounting box (301) installed outside the tank (1). A linear direct drive motor (302) is installed inside the mounting box (301). The driving end of the linear direct drive motor (302) is connected to a drive shaft (303). The end of the drive shaft (303) passes through the tank (1) and the inner cavity (101) and enters the placement box (2). A vibration plate (304) is installed at the end of the drive shaft (303).

4. The water temperature monitoring and extraction simulation device based on geothermal energy in coal mines according to claim 3, characterized in that, A sealing connector (305) is installed between the drive shaft (303) and the tank (1), the inner cavity (101) and the placement box (2).

5. The water temperature monitoring and extraction simulation device based on geothermal energy in coal mines according to claim 4, characterized in that, The tank (1) is provided with an observation window (306) through which the placement box (2) can be observed. There are three observation windows (306). The observation windows (306) are located next to the mounting box (301). The part of the placement box (2) facing the observation window (306) is made of tempered glass.

6. The water temperature monitoring and extraction simulation device based on geothermal energy in coal mines according to claim 5, characterized in that, The lifting assembly (4) includes a stepper motor (401), which is mounted on a mounting plate (103). The driving end of the stepper motor (401) is connected to a threaded rod (402), and a slider (403) is threadedly connected to the threaded rod (402). A sealing piston (404) is installed on the slider (403).

7. The water temperature monitoring and extraction simulation device based on geothermal energy in coal mines according to claim 6, characterized in that, The threaded rod (402) is vertically arranged through the mounting plate (103), and the slider (403) slides up and down between the top of the inner cavity (101) and the bottom of the mounting plate (103).

8. The water temperature monitoring and extraction simulation device based on geothermal energy in coal mines according to claim 7, characterized in that, The pressure application component (5) includes an electric telescopic rod (501). The fixed end of the electric telescopic rod (501) is installed at the bottom of the sealing piston (404). The telescopic end of the electric telescopic rod (501) is fixedly connected to a drive plate (502). Three connecting rods (503) are fixedly connected to the bottom of the drive plate (502). Each connecting rod (503) is fixedly connected to a pressure plate (504) at its bottom. A vent hole (505) is provided on the pressure plate (504). A function box is provided at the bottom of the pressure plate (504). The function box is located at the bottom of the vent hole (505). A second vent hole (5061) is provided on the upper side of the function box.

9. The water temperature monitoring and extraction simulation device based on geothermal energy in coal mines according to claim 8, characterized in that, A guide rod (5063) is vertically arranged inside the functional box. A slider (5064) is slidably connected to the guide rod (5063). A through hole (5062) is provided at the bottom of the functional box, which can accommodate the passage of the elastic rod (6).

10. The water temperature monitoring and extraction simulation device based on geothermal energy in coal mines according to claim 9, characterized in that, When the second slider (5064) is located at the bottom of the functional box, it can block the through hole (5062). When the second slider (5064) is located at the top of the functional box, it can block the first vent (505) and the second vent (5061).

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