A gas sealing device for hydrological experiments

Abstract

The application discloses a kind of gas sealing devices of hydrological experiment, including plug body and the air bag nested in the middle part of plug body, the water injection pipe portion of plug body lower end extension is set as water outlet pipe, the plug body is equipped with containing cavity in top end, containing cavity top end is equipped with four-way joint, containing cavity bottom end vent, containing cavity is equipped with the two-way valve group being connected with four-way joint and vent, two-way valve group includes conversion assembly, conversion assembly top end is respectively equipped with push rod and check valve while bottom end is equipped with pressure touch valve, the application is equipped with two-way valve group in plug body to control the air in and out of plug, so as to lock the gas in air bag, so as to limit the deformation space of air bag, when pressure test section carries out pressure test, water pressure can be individually borne by air bag, so that air bag can maintain sufficient filling in borehole, so as to guarantee the air-tightness of air bag, so that the data of pressure test is more accurate.

Description

Technical Field

[0001] This invention relates to the field of hydrological experiments, specifically to a gas sealing device for hydrological experiments. Background Technology

[0002] In-situ stress is a natural stress existing in the strata, and it is the fundamental force causing deformation and damage to underground powerhouses and other underground engineering projects. Therefore, the magnitude and direction of in-situ stress directly affect the stability of the surrounding rock of underground engineering projects. Measuring the initial stress of underground engineering projects and studying the stress distribution characteristics of the surrounding rock are necessary prerequisites for conducting stability analysis of the surrounding rock of underground engineering projects and for achieving scientific design of underground engineering excavation.

[0003] Hydraulic fracturing, also known as water pressure testing, is the most widely used and common method for measuring geostress. This method involves drilling a hole at a predetermined test depth to seal a section of rock mass using a pair of expandable rubber plugs. A liquid medium is then injected into the sealed section, gradually increasing the liquid pressure and causing the sealed rock mass to fracture. The magnitude and direction of the geostress in the measurement section are then obtained based on the characteristic values ​​of the liquid pressure curve during the fracturing process. Among the methods for expanding the plugs, there are air-filled and hydraulic methods. Hydraulic expansion plugs have the problem of difficulty in expanding and recovering, leading to incomplete sealing and affecting experimental data. However, the air bladder can be drained along with the water injection pipe. Air-filled expansion plugs, on the other hand, have a tight seal, but the venting process requires separate handling.

[0004] When using the pneumatic double-bolt hydrological test method, a pressure sensor is installed at the outlet pipe of the bolt and at the upper and lower ends of the upper and lower air bladders. The bolt is then inserted into the borehole through a drill rod, with the outlet pipe between the two air bladders positioned in the test section within the borehole. Gas is supplied through an inert high-pressure gas cylinder or air pump, inflating the two air bladders and sealing the upper and lower ends of the test section within the borehole. Water is then supplied to the test section through the drill rod via a water injection device to conduct a pressure test and obtain the required data.

[0005] In existing inflatable double plugs, the air supply device is directly connected to the plug. When the plug expands to a sufficient size, the valve at the air supply end is closed to stop the expansion. At this time, the air supply valve and the air bladder are always connected. This means that when the air bladder receives pressurized water in a deep hole, the pipeline between the air supply valve and the air bladder provides deformation space for the air bladder. This increases the pressure exerted by the water pressure on the air bladder and pipeline, resulting in insufficient airtightness and irregular fluctuations in the air bladder. Summary of the Invention

[0006] The purpose of this invention is to provide a gas sealing device for hydrological experiments to solve the above-mentioned technical problems.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a gas sealing device for hydrological experiments, comprising a plug body, a water injection pipe passing through the plug body from top to bottom, and an air bladder nested in the middle of the plug body. The water injection pipe extending from the lower end of the plug body is configured as a water outlet pipe and has multiple through holes on its wall. The top end of the plug body is provided with an air pipe interface for inlet and outlet of air. There are two plug bodies and two air bladders, which are respectively located at the upper and lower ends of the water outlet pipe. The air bladder at the lower end of the water outlet pipe is connected to the air bladder at the top end of the water outlet pipe through a diversion pipe.

[0008] The top of the plug body is provided with a receiving cavity, and the top of the receiving cavity is provided with a four-way connector that is connected to the tracheal interface. As is known, a four-way connector is a connector with four interfaces connected to each other. The bottom of the receiving cavity is provided with an air vent and connector that connect to the inside of the airbag. A two-way valve group connected to the four-way connector and the air vent is installed in the receiving cavity.

[0009] Furthermore, the bidirectional valve assembly includes a conversion component and a swing bracket that holds the conversion component within the accommodating cavity. The conversion component and the swing bracket are connected by a rotating shaft. The top of the conversion component is provided with a push rod and a one-way valve, respectively. The push rod is slidably engaged with the conversion component. The bottom of the conversion component is provided with a pressure-contact valve corresponding to the one-way valve above. The conversion component, push rod, and one-way valve are all connected to a four-way connector via air pipes. The pressure-contact valve is connected to the air inlet via an air pipe. As those skilled in the art know, the conversion component and the swing bracket have a degree of freedom of rotation. Therefore, during installation, the influence of the pipeline connection on the degree of freedom of rotation of the conversion component can be controlled by those skilled in the art according to actual needs, as long as the fixed installation function of the swing bracket and the rotation function of the conversion component can be achieved.

[0010] Furthermore, the one-way valve includes a valve body, a valve cover, a spring, and a valve core. The valve body and the valve cover are locked together. The valve core is pressed against the inner cavity formed by the valve body and the valve cover by the spring. The end of the valve core that is pressed against is the natural air intake end, which can be opened by the sufficiently large pressure generated by the gas when it arrives. The pressure-touch valve is a one-way valve with a connecting post and a pressure plate on the valve core. The middle part of the pressure plate is connected to the head of the valve core through the connecting post. The pressure plate is located in the conversion assembly. As those skilled in the art know, the pressure plate and the connecting post cooperate with the one-way valve to open the one-way valve by mechanical means, specifically by pressing to trigger it. By pressing the pressure plate, the one-way valve is opened. In detail, it is to open the one-way valve to allow the gas in the airbag to be discharged. Therefore, those skilled in the art further know that the pressure plate needs to have a corresponding exhaust structure, such as holes or grooves, which can be set according to actual needs.

[0011] Furthermore, the one-way valve and the pressure-contact valve are each fixed to the conversion assembly at one end as a natural air intake end. It is known that the gas entering from the gas exchange device is delivered to the push rod and the conversion assembly respectively through the three ports of the four-way connector. Since the one-way valve is a bottom-inlet valve, it mainly performs the exhaust function. The air pipe directly connected to the conversion assembly is used to inflate the airbag. The gas filling the conversion assembly enters the airbag through the natural air intake end of the pressure-contact valve. It should be noted that although the gas entering the conversion assembly can still move upwards through the natural air intake end of the one-way valve, since both the air pipe of the one-way valve and the air pipe filling the conversion assembly are connected to the four-way connector, the air pressure at both ends of the one-way valve is balanced during inflation. Therefore, the one-way valve will not be pushed by the gas in the conversion assembly, allowing the gas directly filling the conversion assembly to naturally inflate the airbag through the pressure-contact valve.

[0012] Preferably, the conversion component is movably engaged with the swing bracket via a rotating shaft on both sides along its length, with the rotating shaft positioned near the one-way valve and the pressure-sensitive valve. This indicates that when negative pressure is generated, the push rod retracts, causing the conversion component to swing upwards along the rotating shaft, thereby triggering the internal mechanism of the conversion component. The swing bracket restricts the downward swing freedom of the conversion component. As those skilled in the art will know, this restriction limits the upward swing freedom. In specific implementations, a limiting structure can be provided between the bottom of the swing bracket and the conversion component, or a rigid filler can be used, or a slotted valve can be used to positionally engage with the pressure-sensitive valve, all of which can achieve the limiting function.

[0013] Preferably, the push rod is rigidly connected to the four-way connector. The push rod includes a cylinder tube and a movable rod that is sealed and nested inside the cylinder tube. The bottom end of the movable rod is movably connected to a locking pin of the conversion assembly. The distance from the part of the movable rod nested in the inner wall of the cylinder tube to the bottom end of the cylinder tube is greater than or equal to half the length of the cylinder tube. It is known that air exists in the space between the part of the movable rod nested in the inner wall of the cylinder tube and the bottom end of the cylinder tube. When a negative pressure is generated at the part of the cylinder tube connected to the four-way connector, the push rod moves upward. At the same time, the air in the space between the part of the movable rod nested in the inner wall of the cylinder tube and the bottom end of the cylinder tube is also stretched and expanded. When the conversion assembly opens the exhaust step, the one-way valve exhausts air upward. It is known that at this time, the air pressure from the four-way valve to the movable rod begins to slowly balance, thereby restoring the push rod to its original position.

[0014] Preferably, the conversion assembly includes a cavity shell and a cavity cover. The pressure plate of the pressure-contact valve is located inside the cavity shell. The cavity cover covers the cavity shell at one end near the one-way valve and the pressure-contact valve. The cavity cover has a through hole and is connected to a four-way connector. A slider is provided inside the cavity shell. It can be seen that the air inlet end of the cavity cover is parallel to the movement direction of the slider in the cavity shell. When inflated, the air pressure is large enough to push the slider out and move it to the inner end of the cavity shell, allowing the air in the cavity shell to enter the airbag through the natural air inlet end of the pressure-contact valve. When negative pressure is generated, the slider has a connecting channel connecting the one-way valve and the pressure-contact valve. When the cavity shell swings, the slider slides downward, thereby getting stuck between the one-way valve and the pressure-contact valve. When the slider hits the pressure-contact valve, it triggers the pressure-contact valve. The connecting channel connects the one-way valve and the pressure-contact valve, thereby using the movement of the slider to control the air intake and exhaust of the airbag.

[0015] Furthermore, the cavity housing has a recessed bottom groove at the air hole connected to the pressure valve to accommodate the pressure plate on the pressure valve. In order to cooperate with the pressure plate, the slider has limiting grooves on both sides with the openings located at the bottom. A roller is engaged in the limiting groove by a wheel frame. A spring is provided between the roller and the top wall of the limiting groove. As those skilled in the art know, the spring force of this spring is greater than the spring force of the spring inside the pressure valve, thereby ensuring that the pressure valve can be pressed down to trigger.

[0016] Preferably, the top of the slider is provided with a flow guide shroud, which is frustum-shaped and hollow in the middle. The flow guide shroud is nested on the top of the connecting channel by a rubber sleeve to facilitate exhaust backflow.

[0017] Preferably, the end of the slider that contacts the cavity cover is provided with a retaining ring, and the through hole of the cavity cover is provided with a retaining groove that cooperates with the retaining ring. After the slider slides down, it can be fixed in the required position, ensuring that the connecting channel can be continuously connected with the one-way valve and the pressure contact valve when needed.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1. This invention controls the inlet and outlet of the embolization by incorporating a two-way valve assembly within the embolization body, thereby locking the gas inside the airbag and limiting its deformation space. This ensures that during the pressure test in the pressure test section between the two airbags, the water pressure transmitted to the airbag is not diverted by the pipeline between the air supply valve and the airbag, but is instead borne by the airbag, allowing it to remain sufficiently inflated within the borehole. This ensures the airbag's airtightness and makes the pressure test data more accurate.

[0020] 2. In this invention, both inflation and deflation of the airbag can be triggered by an external gas exchange device to activate the bidirectional valve assembly. The bidirectional valve assembly has only one working state during inflation and deflation. During inflation, the push rod is pushed out by the inflation and the top block is pushed to the end by the inflation, so that the inflation operation can naturally reach the pressure contact valve and enter the airbag. During negative pressure, the push rod will retract due to the negative pressure, and the slider can slide sufficiently to connect the one-way valve and the pressure contact valve, so that the airbag deflates through the activated pressure contact valve, the connecting hole of the slider, and the one-way valve with the negative pressure. This ensures that the inflation and deflation of the airbag can be actually triggered without interference. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0022] Figure 1 This is a three-dimensional structural schematic diagram of the gas sealing device of the present invention;

[0023] Figure 2 This is a cross-sectional schematic diagram of the present invention implemented on site;

[0024] Figure 3 This is a structural diagram showing the position of the two-way valve assembly within the plug body;

[0025] Figure 4 This is a front view of the bidirectional valve assembly.

[0026] Figure 5 This is a partially cutaway 3D exploded view of the bidirectional valve assembly;

[0027] Figure 6 This is a partial orthogonal section diagram of a two-way valve assembly;

[0028] Figure 7 This is a partial cross-sectional three-dimensional structural diagram of the push rod;

[0029] Figure 8 This is a three-dimensional exploded view of a check valve and a pressure-contact valve;

[0030] Figure 9 This is a partial cross-sectional three-dimensional schematic diagram of the slider with rollers.

[0031] Figure 10 This is a partial side cross-sectional diagram of the slider when a retaining ring is provided.

[0032] The attached diagram lists the components represented by each number as follows:

[0033] A. Drill pipe; B. Water injection equipment; C. Gas exchange equipment; D. Gas pipe; E. Pressure sensor;

[0034] 1. Inlet pipe; 2. Plug; 3. Airbag; 4. Outlet pipe; 5. Diverter pipe; 6. Two-way valve assembly;

[0035] 2a. Receptacle; 2b. Vent; 2c. Four-way connector;

[0036] 61. Conversion assembly; 62. Swing bracket; 63. Push rod; 64. Pressure valve; 65. Check valve;

[0037] 611. Cavity shell; 612. Cavity cover; 613. Slider; 61a. Bottom groove; 6131. ​​Roller; 6132. Radiator; 6133. Rubber sleeve; 6134. Snap ring; 613a. Connecting channel;

[0038] 631. Cylinder pipe; 632. Moving rod; 633. Locking pin;

[0039] 641. Connecting column; 642. Pressure plate;

[0040] 651. Valve body; 652. Valve cover; 653. Valve core; 654. Spring. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Please see Figure 1-2 This invention provides a technical solution for a gas sealing device for hydrological experiments: a gas sealing device for hydrological experiments includes a plug body 2, a water injection pipe 1 that passes through the plug body 2 from top to bottom, and an air bladder 3 nested in the middle of the plug body 2. The water injection pipe 1 extending from the lower end of the plug body 2 is configured as a water outlet pipe 4 and has multiple through holes on its wall. The top end of the plug body 2 is provided with an air pipe D interface for air inlet and outlet. There are two plug bodies 2 and two air bladders 3, which are respectively located at the upper and lower ends of the water outlet pipe 4. The air bladder 3 at the lower end of the water outlet pipe 4 and the air bladder 3 at the top end of the water outlet pipe 4 are connected through a diversion pipe 5.

[0043] Please see Figure 2In the existing technology, when using the double-bolt hydrological test method, a pressure sensor E is installed at the outlet pipe 4 of the bolt and at the upper and lower ends of the upper and lower air bladders 3. Then, the bolt is sent into the hole through the drill rod A, so that the outlet pipe 4 between the two air bladders 3 is located in the test section to be tested in the hole. Then, through the gas exchange device C, gas is injected into the air bladders 3 through the gas pipe D, causing the two air bladders 3 to expand and plug and seal the upper and lower ends of the test section in the hole. Then, water is supplied to the test section through the water injection device B via the drill rod A to conduct a water pressure test.

[0044] As is known, if an electric valve is used on the plug body 2 of the embolization to control the deformation space of the airbag 3 within the airbag 3, firstly, there is no suitable solenoid valve in the existing technology that can directly control one-to-two, and most solenoid valves that can be modified and are suitable for the size of the embolization can only withstand a maximum pressure of 0.7MPa, while the inflation pressure of the airbag 3 during use is not less than 2MPa, and the pressure applied to the solenoid valve after the airbag 3 is sealed will be even greater, while it must also withstand the pressure of the water pressure test section. Secondly, because the installation of the embolization is subject to frequent impacts and collisions, and often takes place tens of meters underground, the electronic components are prone to unpredictable damage.

[0045] Please refer to Figure 3 The plug body 2 at the top is provided with a receiving cavity 2a. The top of the receiving cavity 2a is provided with a four-way connector 2c that is connected to the air tube D interface. It is known that the four-way connector 2c is a connector with four interfaces connected to each other. The bottom of the receiving cavity 2a is provided with an air vent 2b that is connected to the inside of the airbag 3 and a connector. A two-way valve group 6 connected to the four-way connector 2c and the air vent 2b is installed in the receiving cavity 2a.

[0046] And, please see Figure 4 The bidirectional valve assembly 6 includes a conversion component 61 and a swing bracket 62 that holds the conversion component 61 within the accommodating cavity 2a. The conversion component 61 and the swing bracket 62 are connected by a rotating shaft. The top of the conversion component 61 is provided with a push rod 63 and a one-way valve 65, respectively. The push rod 63 is slidably engaged with the conversion component 61. The bottom of the conversion component 61 is provided with a pressure-contact valve 64 corresponding to the one-way valve 65 above. The conversion component 61, the push rod 63, and the one-way valve 65 are all connected to the four-way connector 2c through an air pipe D. The pressure-contact valve 64 is connected to the air inlet 2b through an air pipe D. As those skilled in the art know, the conversion component 61 and the swing bracket 62 have a degree of freedom of rotation. Therefore, when setting up, the influence of the pipeline connection on the degree of freedom of rotation of the conversion component 61 can be controlled by those skilled in the art according to actual needs, as long as the fixed installation function of the swing bracket 62 and the rotation function of the conversion component 61 can be achieved.

[0047] For further details, please refer to Figure 8The one-way valve 65 includes a valve body 651, a valve cover 652, a spring 654, and a valve core 653. The valve body 651 and the valve cover 652 are locked together. The valve core 653 is pressed against the inner cavity formed by the valve body 651 and the valve cover 652 by the spring 654. One end of the valve core 653 is the natural air intake end, which can be opened by the sufficient pressure generated by the gas when it arrives. The pressure-contact valve 64 is a one-way valve 65 with a connecting post 641 and a pressure plate 642 on the valve core 653. The middle of the pressure plate 642 is connected to the connecting post. 641 is connected to the head of valve core 653. The pressure plate 642 is located inside the conversion assembly 61. As those skilled in the art know, the pressure plate 642 and the connecting post 641 cooperate with the one-way valve 65 to open the one-way valve 65 by mechanical means. Specifically, the means is to press to trigger. By pressing the pressure plate 642, the one-way valve 65 is opened. In detail, it is to open the one-way valve 65 to allow the gas in the airbag 3 to be discharged. Therefore, those skilled in the art know that the pressure plate 642 needs to have a corresponding exhaust structure, such as holes or grooves. Those skilled in the art can set it according to actual needs.

[0048] For further details, please refer to Figure 5-6 The one-way valve 65 and the pressure-contact valve 64 are each fixed to the conversion assembly 61 at one end, which is the natural air intake end. It is known that the gas entering from the gas exchange device C is delivered to the push rod 63 and the conversion assembly 61 respectively through the three ports of the four-way connector 2c. Since the one-way valve 65 is the bottom air intake, it mainly undertakes the exhaust function. The air pipe D, directly connected to the conversion assembly 61, is used to inflate the airbag 3. The gas filling the conversion assembly 61 enters through the natural air intake end of the pressure-contact valve 64. It should be noted that, although the gas entering the conversion component 61 can still move upward through the natural air intake end of the one-way valve 65, since both the air pipe D of the one-way valve 65 and the air pipe D that fills the conversion component 61 are connected to the four-way connector 2c, the air pressure at both ends of the one-way valve 65 is balanced during inflation. Therefore, the one-way valve 65 will not be pushed by the gas in the conversion component 61, allowing the gas directly filling the conversion component 61 to naturally fill the airbag 3 through the pressure contact valve 64.

[0049] It should be noted that since the check structures of the one-way valve 65 and the pressure-contact valve 64 are relatively simple, they are more effective when used as simple check structures. There are many products available within the size range suitable for the plug 2, all of which can withstand air pressures exceeding 2MPa, such as the 304 stainless steel hexagonal internal thread one-way valve, which can withstand pressures up to 6.4MPa. Those skilled in the art can choose according to actual needs, which will not be elaborated here.

[0050] This embodiment provides a specific implementation method. The conversion component 61 is movably engaged with the swing bracket 62 on both sides along its length direction via a rotating shaft. The rotating shaft is located at the end near the one-way valve 65 and the pressure-contact valve 64. Thus, when negative pressure is generated, the push rod 63 retracts, thereby driving the conversion component 61 to swing upward along the rotating shaft, thereby triggering the internal mechanism of the conversion component 61. The swing bracket 62 restricts the downward swing freedom of the conversion component 61. As those skilled in the art know, the restriction restricts the freedom of the end that can swing upward. In specific implementations, a limiting structure can be set between the bottom end of the swing bracket 62 and the conversion component 61, or a rigid filler can be used, or a slotted rod can be used to positionally engage with the pressure-contact valve 64, all of which can achieve the limiting function.

[0051] This embodiment provides a specific implementation method. Please refer to [link / reference]. Figure 7 The push rod 63 is rigidly connected to the four-way connector 2c. The push rod 63 includes a cylinder tube 631 and a movable rod 632 that is sealed and nested inside the cylinder tube 631. The bottom end of the movable rod 632 is movably connected to the conversion assembly 61 by a locking pin 633. The distance from the part of the movable rod 632 nested in the inner wall of the cylinder tube 631 to the bottom end of the cylinder tube 631 is greater than or equal to half the length of the cylinder tube 631. It is known that at the part of the movable rod 632 nested in the inner wall of the cylinder tube 631... There is air in the space at the bottom of the cylinder pipe 631. When negative pressure is generated at the part where the rear end of the cylinder pipe 631 is connected to the four-way connector 2c, the push rod 63 moves upward. At the same time, the air in the space between the part where the movable rod 632 is nested with the inner wall of the cylinder pipe 631 and the bottom of the cylinder pipe 631 will also be stretched and expanded. When the conversion component 61 opens the exhaust step, the one-way valve 65 exhausts upward. As is known, at this time, the air pressure from the four-way valve to the movable rod 632 begins to slowly balance, thereby restoring the push rod 63 to its original position.

[0052] This embodiment provides a specific implementation method. Please refer to [link / reference]. Figure 5 , 6The conversion assembly 61 includes a cavity shell 611 and a cavity cover 612. The pressure plate 642 of the pressure valve 64 is located inside the cavity shell 611. The cavity cover 612 covers the cavity shell 611 at one end near the one-way valve 65 and the pressure valve 64. The cavity cover 612 has a through hole and is connected to the four-way connector 2c. A slider 613 is provided inside the cavity shell 611. It can be seen that the air inlet end of the cavity cover 612 is parallel to the movement direction of the slider 613 in the cavity shell 611. When inflated, the air pressure is large enough to push the slider 613 out and move it to the cavity shell 611. 1. At the inner end, the air in the cavity shell 611 enters the airbag 3 through the natural air inlet end of the pressure contact valve 64. When negative pressure is generated, the slider 613 is provided with a connecting channel 613a that connects the one-way valve 65 and the pressure contact valve 64. When the cavity shell 611 swings, the slider 613 slides downward, thereby getting stuck between the one-way valve 65 and the pressure contact valve 64. When the slider 613 presses against the pressure contact valve 64, it triggers the pressure contact valve 64. The connecting channel 613a is used to connect the one-way valve 65 and the pressure contact valve 64, thereby using the movement of the slider 613 to control the air intake and exhaust of the airbag 3.

[0053] In the specific implementation process, after the embolism is delivered to the designated position, it is inflated using the gas exchange device C. Those skilled in the art may choose to use an inert high-pressure gas cylinder or a gas pump to supply gas to the gas exchange device C. When there is a need for evacuation, a gas pump is required for evacuation. When the gas is delivered to the four-way connector 2c through the external gas pipe D, it is divided into three simultaneous events:

[0054] 1) Gas is filled into the push rod 63. Since the swing bracket 62 restricts the downward swing freedom of the conversion component 61, the conversion component 61 does not move. It should be noted that in this step, even if the conversion component 61 swings downward, it will not have any effect.

[0055] 2) Gas is introduced into the one-way valve 65. Since the natural air intake end of the one-way valve 65 is located at the position where it is connected to the conversion component 61, that is, at the lower end of the one-way valve 65, this inflation will not trigger the one-way valve 65 to open.

[0056] 3) Gas is filled into the conversion component 61. Gas is filled into the cavity shell 611 through the through hole of the cavity cover 612. At this time, if the slider 613 is between the one-way valve 65 and the pressure valve 64, it will be driven by the filled gas to slide to the other end of the cavity shell 611. The gas filled into the cavity shell 611 can open the pressure valve 64 and enter the air bag 3 from the natural air inlet end of the pressure valve 64. The gas filled into the air bag 3 will be sealed by the one-way pressure valve 64, controlling the pressure and deformation space within the air bag 3.

[0057] When an air pump is used for evacuation, the negative pressure is delivered to the four-way connector 2c through the external air pipe D, which occurs in three simultaneous events:

[0058] 1) A negative pressure is generated inside the push rod 63, causing the movable rod 632 to retract towards the cylinder tube 631. This, in turn, uses the locking pin 633 to lift the conversion component 61, causing the slider 613 inside the cavity 611 to slide downwards. This causes the slider 613 to engage with the one-way valve 65 and the pressure valve 64 inside the cavity 611, thereby triggering the pressure valve 64. This causes the gas inside the airbag to rush upwards from the open pressure valve 64, and then be discharged upwards through the connecting channel 613a and the one-way valve 65.

[0059] 2) When negative pressure is generated on the one-way valve 65, the one-way valve 65 tends to open upwards. It can cooperate with the slider 613 to trigger the pressure contact valve 64 and wait for the exhaust. If the slider 613 has not yet triggered the pressure contact valve 64 when negative pressure is generated in the conversion component 61, the pressure on both ends of the one-way valve 65 is balanced and it will not start to open.

[0060] 3) Negative pressure is generated in the conversion component 61, which is the same as the negative pressure generated on the one-way valve 65, depending on the timing of when the slider 613 triggers the pressure contact valve 64.

[0061] It should be noted that if the movable rod 632 and the front end of the cylinder tube 631 leak inside the push rod 63, causing it to fill with fresh gas and preventing the push rod 63 from resetting through pressure balance after the negative pressure ends, it will not affect the use of the slider 613. This is because the inclined cavity shell 611 itself facilitates the slider 613 to remain in the working position, and the air pressure generated by the incoming gas during the next inflation operation will reset the push rod 63. In addition, those skilled in the art can optionally use a tension spring or spring on the push rod 63 to reset it. In contrast, the gas discharged from the movable rod 632 and the front end of the cylinder tube 631 during the known reset process enters the air in the accommodating cavity 2a, which will not be elaborated here.

[0062] This embodiment provides a specific implementation method. Please refer to [link / reference]. Figure 5 , 6 The cavity 611 has a recessed bottom groove 61a at the air hole connected to the pressure valve 64 to accommodate the pressure plate 642 on the pressure valve 64. In order to cooperate with the pressure plate 642, the slider 613 has limiting grooves on both sides with the openings located at the bottom. The limiting grooves are fitted with rollers 6131 by a wheel frame. A spring 654 is provided between the rollers 6131 and the top wall of the limiting groove. As those skilled in the art know, the elastic force of the spring 654 is greater than the elastic force of the spring 654 inside the pressure valve 64, so as to ensure that the pressure valve 64 can be pressed down to trigger. It is known that in order to ensure smooth triggering, at least two rollers 6131 are symmetrically provided under the slider 613. The rollers 6131 can reduce the friction of the slider 613 in the cavity 611, so that the slider 613 slides more smoothly.

[0063] This embodiment provides a specific implementation method. Please refer to [link / reference]. Figure 5 , 6 The top of the slider 613 is provided with a flow guide 6132. The flow guide 6132 is frustum-shaped and hollow in the middle. The flow guide 6132 is nested on the top of the connecting channel 613a by a rubber sleeve 6133 to facilitate exhaust backflow.

[0064] This embodiment provides a specific implementation method. Please refer to [link / reference]. Figure 10 The slider 613 is provided with a retaining ring 6134 at one end that contacts the cavity cover 612. The cavity cover 612 has a retaining groove in the through hole that cooperates with the retaining ring 6134. After the slider 613 slides down, it can be fixed in the required position, ensuring that the connecting channel 613a can be continuously connected with the one-way valve 65 and the pressure contact valve 64 when needed.

Claims

1. A gas sealing device for hydrological experiment, comprising a plug body, a water injection pipe arranged through the plug body from top to bottom, and an air bag nested in the middle of the plug body, a water outlet pipe part of the water injection pipe extending from the lower end of the plug body is provided with a plurality of through holes on the pipe wall, and a gas pipe interface for air intake and exhaust is arranged at the top end of the plug body, characterized in that: the plug body and the air bag are provided with two, the two plug bodies and air bags are respectively located at the upper and lower ends of the water outlet pipe, and the air bag at the lower end of the water outlet pipe is connected with the air bag at the top end of the water outlet pipe through a shunt pipe; a containing cavity is arranged in the plug body at the top end, a four-way joint is arranged at the top end of the containing cavity and connected with the gas pipe interface, a gas vent and a joint connected with the inside of the air bag are arranged at the bottom end of the containing cavity, a two-way valve group connected with the four-way joint and the gas vent is arranged in the containing cavity; the two-way valve group comprises a conversion assembly and a swing bracket for clamping the conversion assembly in the containing cavity, the conversion assembly and the swing bracket are connected through a rotating shaft, a push rod and a one-way valve are respectively arranged at the top end of the conversion assembly, the push rod is slidably clamped with the conversion assembly, and a pressure touch valve is arranged at the bottom end of the conversion assembly corresponding to the one-way valve; the conversion assembly, the push rod and the one-way valve are connected with the four-way joint through a gas pipe, and the pressure touch valve is connected with the gas vent through a gas pipe; the conversion assembly is movably connected with the swing bracket through the rotating shaft on the front and back sides along the length direction of the conversion assembly, and the position of the rotating shaft is close to the one-way valve and the pressure touch valve at one end, and the swing bracket limits the freedom degree of downward swinging of the conversion assembly; the conversion assembly comprises a cavity shell and a cavity cover, the cavity cover covers one end of the cavity shell close to the one-way valve and the pressure touch valve, a through hole is arranged in the cavity cover and connected with the four-way joint, a sliding block is arranged in the cavity shell, and a communication channel connected with the one-way valve and the pressure touch valve is arranged on the sliding block; limit grooves are arranged on both sides of the sliding block and the openings are located at the bottom, rollers are clamped in the limit grooves through a wheel frame, and springs are arranged between the rollers and the top wall of the limit grooves. the one-way valve comprises a valve body, a valve cover, a spring and a valve core, the valve body and the valve cover are locked and fixed with each other, the valve core is clamped in the inner cavity formed by the combination of the valve body and the valve cover through the spring, and one end of the valve core is a natural air inlet end; the pressure touch valve is a one-way valve provided with a connecting column and a pressure plate on the valve core, the middle part of the pressure plate is connected with the head part of the valve core through the connecting column, and the pressure plate is located in the conversion assembly. the one-way valve and the pressure touch valve are respectively fixed to one end of the conversion assembly as the natural air inlet end. the push rod is rigidly connected with the four-way joint, the push rod comprises a gas cylinder pipe and a movable rod which is tightly nested in the gas cylinder pipe, and a clamping pin movably connected with the conversion assembly is arranged at the bottom end of the movable rod; the distance from the part of the movable rod nested with the inner wall of the gas cylinder pipe to the bottom end of the gas cylinder pipe is greater than or equal to one half of the length of the gas cylinder pipe. the pressure plate of the pressure touch valve is located in the cavity shell. a recessed bottom groove for accommodating the pressure plate on the pressure touch valve is arranged at the air hole connected with the pressure touch valve in the cavity shell.

2. The gas sealing device for hydrologic experiment according to claim 1, characterized in that: a flow guide cover is arranged at the top end of the sliding block, the flow guide cover is in the shape of a circular truncated cone and has a hollow structure in the middle part, and the flow guide cover is nested on the top of the communication channel through a rubber sleeve. ​ 3. The device according to claim 2, wherein: ​ 4. The gas sealing device for hydrological experiment according to claim 3, characterized in that: ​ ​ 5. The device according to claim 4, wherein: ​ 6. The device according to claim 5, wherein: ​ 7. The device according to claim 5, wherein: ​ 8. The device according to claim 5, wherein: The end of the slider in contact with the cavity cover is provided with a clamping ring, and the through hole of the cavity cover is provided with a clamping groove matched with the clamping ring.

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