Integrated device for collecting shallow biogas by using expansion heat absorption

Abstract

An inflation heat absorption type liquid purification integrated device for collecting shallow biogas comprises a device shell, a grouting reinforcement system, an air inlet system, a cooling device, a first liquefied gas collection system and a second liquefied gas collection system, the grouting reinforcement system, the air inlet system, the cooling device, the first liquefied gas collection system and the second liquefied gas collection system are located in the device shell, the air inlet pipeline of the air inlet system is communicated with the first liquefied gas collection system, the first liquefied gas collection system is connected with the second liquefied gas collection system through a gas conveying pipeline, and the refrigeration part of the cooling device is located in the first liquefied gas collection system and the second liquefied gas collection system. The present application neither affects the surrounding environment nor the soil structure, and is the reuse of shallow biogas, in line with the national low-carbon green development strategy; and the soil cavity formed after the release of the shallow biogas is backfilled with mud, effectively preventing ground subsidence.

Description

Technical Field

[0001] This invention belongs to the field of underground engineering and is a device for collecting shallow biogas in underground engineering, especially an expansion-type endothermic liquid purification integrated device for collecting shallow biogas, which is suitable for collecting shallow biogas in coastal soft soil areas. Background Technology

[0002] With the rapid development of my country's social economy, the construction of urban underground rail transit is increasing. In some coastal cities, such as Shanghai, Hangzhou, and Guangzhou, tunnels frequently pass through shallow methane strata during subway construction. Shallow methane in soft soil strata is mainly methane-rich gas formed by anaerobic microorganisms in an oxygen-deficient environment from organic matter in sediments. It mostly exists in vesicular forms and is unevenly distributed, with some exhibiting high content and pressure. If shallow methane is not treated during underground engineering construction, it can lead to accidents such as tunnel displacement and fracture, slope collapse and instability, and explosions at the work face, endangering personal safety and tunnel structural safety, and causing irreparable and huge economic losses. Common methods for treating shallow methane include drilling and casing methods and static pressure release methods. While these methods release the shallow gas in advance and ensure the safety of underground engineering construction to a certain extent, they do not conform to the green, low-carbon, and environmentally friendly construction concepts of underground engineering. Prematurely releasing shallow methane wastes naturally stored underground methane and also impacts the surrounding environment. Summary of the Invention

[0003] To overcome the shortcomings of existing technologies, this invention provides an expansion-type endothermic liquid purification integrated device for collecting shallow biogas. It integrates the green emission and collection of shallow biogas, without affecting the surrounding environment or soil structure. Moreover, it reuses shallow biogas, which is in line with the national low-carbon and green development strategy. Furthermore, it backfills the soil cavities formed after the release of shallow biogas with mud, effectively preventing ground subsidence.

[0004] The technical solution adopted by this invention to solve its technical problem is:

[0005] An expansion-type endothermic liquid purification integrated device for collecting shallow biogas includes a device shell, a grouting and reinforcement system for backfilling soil cavities formed after the release of shallow biogas, an air intake system for connecting the shallow biogas, a cooling device for cooling the passing biogas, a first liquefied gas collection system for collecting liquefied carbon dioxide, and a second liquefied gas collection system for collecting liquefied methane. The grouting and reinforcement system, air intake system, cooling device, first liquefied gas collection system, and second liquefied gas collection system are located inside the device shell. The air intake pipe of the air intake system is connected to the first liquefied gas collection system, and the first liquefied gas collection system is connected to the second liquefied gas collection system through a gas transmission pipe. The refrigeration section of the cooling device is located inside the first liquefied gas collection system and the second liquefied gas collection system.

[0006] Furthermore, the grouting reinforcement system includes a mud pump controller, a grout delivery pipe, a mud pump, a grout suction pipe, a grout spraying pipe, a grout suction port, a mud tank, and a grouting up-and-down drive assembly. The mud pump controller is installed at the top of the device housing and is used to control the mud pump to draw mud from the mud tank through the grout suction pipe. The mud flows along the grout delivery pipe and is filled with biogas bubbles through the spraying pipe with inserted bladder-shaped biogas bubbles. The mud pump controller is connected to the control end of the mud pump. The inlet of the mud pump is connected to the outlet of the spraying pipe. The inlet of the spraying pipe is connected to the bottom outlet of the mud tank. The outlet of the mud pump is connected to the upper end of the grout delivery pipe. The spraying pipe is tightly fitted to the inner wall of the grout delivery pipe and can be movably connected up and down. The spraying pipe is connected to the grouting up-and-down drive assembly for driving the spraying pipe to move up and down.

[0007] Preferably, the grouting up-and-down drive assembly includes a built-in threaded bevel gear, a first motor, a grouting drive shaft, and a grouting bevel gear. The upper end of the grouting pipe is fitted with a grouting sealing ring that fits tightly against the inner wall of the grout delivery pipe to prevent grout leakage. The lower end thread of the grouting pipe meshes with the internal thread of the built-in threaded bevel gear. The lower end of the output shaft of the first motor is equipped with the grouting bevel gear, which meshes with the left end of the grouting drive shaft. The right end of the grouting drive shaft meshes with the built-in threaded bevel gear. The first motor drives the grouting drive shaft to rotate via the grouting bevel gear, thereby causing the built-in threaded bevel gear to rotate. In other words, the rotation of the first motor is converted into vertical movement of the grouting pipe. Of course, other up-and-down drive methods can also be used.

[0008] Furthermore, the cooling equipment employs a dual-piston reciprocating magnetically controlled cooler; however, other cooling methods can also be used, as long as they can achieve the cooling temperature required for liquefied methane and carbon dioxide. The dual-piston reciprocating magnetically controlled cooler includes a steel wire mesh, magnets, hollow buffer rubber balls, high-temperature resistant rubber, low-temperature resistant rubber anti-collision strips, a cooling copper wall, a transmission rod, a driven bevel gear, a honeycomb heat dissipation mesh, thermally broken aluminum alloy, a driving bevel gear, heat dissipation copper pipes, a small cylinder, a large cylinder, heat dissipation copper fins, a second motor, a small piston, and a large piston.

[0009] Two pieces of the aforementioned wire mesh are fixed in the common area where the large and small cylinders meet on the left and right sides, respectively. The magnet is located inside the hollow buffer rubber ball and is connected in series with the transmission rod so that the magnet can rotate with the transmission rod. The hollow buffer rubber ball is a sealed device and is located on the central axis formed by the transmission rod. Two pieces of high-temperature resistant rubber are respectively glued to both ends of the thermally broken aluminum alloy at the large cylinder, and are in contact with the wire mesh and the low-temperature resistant rubber anti-collision strip. Two low-temperature resistant rubber anti-collision strips are respectively attached to the junction of the left and right wire mesh and the small cylinder. The low-temperature resistant rubber anti-collision strips are distributed in a mesh pattern. The cooling copper wall is located in the double piston reciprocating magnetic control. The outermost part of the cooler is ring-shaped and fixed to the thermally broken aluminum alloy outside the large cylinder to absorb external heat. The passive bevel gear at the end of the transmission rod meshes with the active bevel gear. The rod body passes through a honeycomb heat dissipation mesh, a hollow buffer rubber ball, and a magnet, and is surrounded by the honeycomb heat dissipation mesh. The honeycomb heat dissipation mesh is installed around the center of the device, is cylindrical, and has a portion of its center hollowed out to accommodate the bevel gear and to provide a channel for the transmission rod to dissipate heat from the dual-piston reciprocating magnetically controlled cooler. The active bevel gear is located at the center of the entire device and is connected to the output shaft of the second motor and meshes with the first bevel gear at one end of the transmission rod.

[0010] The heat dissipation copper pipes are arranged in a ring around the periphery of the honeycomb heat dissipation mesh. The heat dissipation copper pipes and the thermally broken aluminum alloy are fixed to form a large cylinder. The small cylinder is fixed in a ring around the outside of the large cylinder and is surrounded by a cooling copper wall and part of the thermally broken aluminum alloy. It is used for the reciprocating motion of the small piston. The large cylinder is located in a ring between the honeycomb heat dissipation mesh and the small cylinder. It is surrounded by heat dissipation copper pipes and thermally broken aluminum alloy. It is used for the reciprocating motion of the large piston. The heat dissipation copper plates are fixed to the upper part of the outside of the large cylinder in a vertical plate shape and are distributed circumferentially. The small piston includes a variable resistance plate and low-temperature copper. The small piston is located in the small cylinder and is used to control the thrust generated by compressing helium. When the thrust reaches the calibrated value, the compressed helium expands in the small cylinder. The large piston includes a strong magnet, an insulating sealing sleeve and tungsten steel. The large piston is located in the large cylinder and compresses the helium in the large cylinder through reciprocating motion.

[0011] Preferably, the thermally broken aluminum alloy is divided into three parts. One part is located on the outermost part of the thermally broken aluminum alloy with a steel wire mesh inside. Another part is located on the inner part of the thermally broken aluminum alloy and forms an atmospheric cylinder with the heat dissipation copper pipe to insulate heat. The third part is located below the honeycomb heat dissipation mesh, in the shape of a disc, and is welded to the thermally broken aluminum alloy of the atmospheric cylinder to prevent the heat released by the honeycomb heat dissipation mesh from entering the liquefied gas collection system.

[0012] Furthermore, the first liquefied gas collection system includes a first funnel-shaped liquid collection device, a first thermally broken aluminum alloy fixing frame, a first external fixing steel frame, a first Dewar flask, a first bottle outlet, a first inlet back pressure valve, and a first outlet back pressure valve.

[0013] The air inlet of the first funnel-shaped liquid collecting device is connected to the air inlet pipe, and the air outlet of the first funnel-shaped liquid collecting device is connected to the inlet of the air supply pipe. The refrigeration part of the cooler is located inside the first funnel-shaped liquid collecting device, and the heat dissipation part of the cooler is outside the first funnel-shaped liquid collecting device. The first thermally broken aluminum alloy fixing frame is fixed inside the first funnel-shaped liquid collecting device for fixing the cooler. The first external fixing steel frame is fixed to the outside of the first funnel-shaped liquid collecting device and the inner wall of the device. The first Dewar flask is located at the lower collection port of the first funnel-shaped liquid collecting device for collecting liquid carbon dioxide. The first bottle removal port is located on the outer wall of the device and communicates with the inside of the device for replacing the first Dewar flask containing liquid carbon dioxide. The first inlet back pressure valve is located at the air inlet, and the first outlet back pressure valve is located at the outlet of the first funnel-shaped liquid collecting device.

[0014] The second liquefied gas collection system includes a second funnel-shaped liquid collection device, a second thermally broken aluminum alloy fixing frame, a second external fixing steel frame, a second Dewar flask, and a second bottle outlet. The air inlet of the second funnel-shaped liquid collection device is connected to the outlet of the gas transmission pipeline. The refrigeration part of the cooler is located inside the second funnel-shaped liquid collection device, and the heat dissipation part of the cooler is outside the second funnel-shaped liquid collection device. The second thermally broken aluminum alloy fixing frame is fixed inside the second funnel-shaped liquid collection device to fix the cooler. The second external fixing steel frame is fixed to the outside of the second funnel-shaped liquid collection device and the inner wall of the device. The second Dewar flask is located at the lower collection port of the second funnel-shaped liquid collection device and is used to collect liquid methane. The second bottle outlet is located on the outer wall of the device and communicates with the inside of the device to replace the second Dewar flask containing liquid methane.

[0015] The air intake system includes an air intake pipe, a pressure gauge, an external threaded air intake pipe, and an air intake up-and-down drive assembly. One end of the air intake pipe is adjacent to the first air intake back pressure valve, and the other end of the air intake pipe contains the external threaded air intake pipe for introducing shallow biogas from the bladder-like biogas bubbles. The external threaded air intake pipe is connected to the up-and-down drive assembly for driving the external threaded air intake pipe to move up and down. The pressure gauge is fixed on the air intake pipe, and the gauge head is located outside the device wall.

[0016] Preferably, the air intake system further includes an air intake sealing ring, which is fixed to the upper end of the external threaded air intake pipe and is completely fitted to the inner wall of the air intake pipe to prevent shallow biogas leakage.

[0017] Preferably, the intake up-and-down drive assembly includes an internal threaded bevel gear, a fourth motor, an intake drive shaft, and an intake bevel gear. The lower end of the external threaded intake pipe has an external thread that meshes with the internal thread of the internal threaded bevel gear. The internal threaded bevel gear is located at one end of the intake drive shaft, and the other end of the intake drive shaft meshes with the intake bevel gear. The intake bevel gear is mounted on the output shaft of the fourth motor. Of course, other up-and-down drive methods can also be used.

[0018] In this invention, the method of liquefying and collecting shallow biogas extracted from underground and filling the soil cavities formed after the shallow biogas is released in advance with mud is a green and low-carbon method for treating shallow biogas.

[0019] Shallow biogas liquefaction collection involves cooling gaseous biogas into liquid biogas using mechanical refrigeration. Currently, there is a lack of a device that can extract underground natural biogas, improve its purity, and perform cooling liquefaction. This invention primarily addresses the shortcomings of current shallow biogas devices, which cannot purify the gas or perform systematic collection. To find a green and low-carbon method for extracting shallow underground biogas, an expansion-endothermic integrated liquid purification device for collecting shallow biogas has been invented.

[0020] The beneficial effects of this invention are mainly reflected in the following aspects: 1. It can extract biogas from bladder-shaped biogas bubbles at different burial depths; 2. The gas liquefaction temperature can be flexibly adjusted, and cooling liquefaction is carried out by magnetic control; 3. The soil cavities formed after the release of shallow biogas can be backfilled with mud to effectively prevent ground subsidence. Attached Figure Description

[0021] Figure 1 A cross-sectional view of an expansion-type endothermic liquid purification integrated device for collecting shallow biogas;

[0022] Figure 2 for Figure 1 A diagram illustrating the working state;

[0023] Figure 3 for Figure 1Top view of section AA;

[0024] Figure 4 for Figure 1 Top view of the BB section;

[0025] Figure 5 This is a cross-sectional view of the grouting reinforcement system;

[0026] Figure 6 This is a top view of a dual-piston reciprocating magnetron chiller.

[0027] Figure 7 for Figure 6 Cross-sectional view of section DD;

[0028] Figure 8 for Figure 6 Cross-sectional view of the EE section;

[0029] Figure 9 for Figure 6 Top view sectional view;

[0030] Figure 10 This is a top-view cross-sectional view of a liquefied gas collection system;

[0031] Figure 11 This is a cross-sectional view of the intake system;

[0032] Figure 12 for Figure 1 The front view.

[0033] The attached diagram is labeled as follows: 101 is the mud pump controller; 102 is the grout delivery pipe; 103 is the mud pump; 104 is the grouting sealing ring; 105 is the grout suction pipe; 106 is the spraying pipe; 107 is the grout suction port; 108 is the grouting internal threaded bevel gear; 109 is the mud bucket; 110 is the mud; 111 is the first motor; 112 is the grouting drive shaft; 113 is the grouting bevel gear; 402 is the wire mesh; 403 is the magnet; 40... 4 is a hollow buffer rubber ball, 405 is high-temperature resistant rubber, 406 is a low-temperature resistant rubber anti-collision strip, 407 is a cooling copper wall, 408 is a transmission rod, 409 is a driven bevel gear, 410 is a honeycomb heat dissipation mesh, 411 is a thermally broken aluminum alloy, 412 is a driving bevel gear, 413 is a heat dissipation copper pipe, 414 is a small cylinder, 415 is a large cylinder, 416 is a heat dissipation copper fin, 419 is a second motor, 420 is a small piston, 42... 1 is a large piston; 501 is a first funnel-shaped liquid collection device; 502 is a first thermally broken aluminum alloy fixing frame; 503 is a first external fixing steel frame; 504 is a first Dewar flask; 505 is a first bottle outlet; 506 is a first inlet back pressure valve; 507 is a first outlet back pressure valve; 508 is a gas supply pipeline; 619 is a third motor; 701 is a second funnel-shaped liquid collection device; 702 is a second thermally broken aluminum alloy fixing frame; 70... 3 is the second external fixed steel frame; 704 is the second Dewar flask; 801 is the air inlet pipe; 802 is the air pressure gauge; 803 is the air inlet sealing ring; 804 is the external threaded air inlet pipe; 805 is the internal threaded bevel gear for air inlet; 806 is the fourth motor; 807 is the air inlet drive shaft; 808 is the air inlet bevel gear; 9 is the four-motor controller; 10 is the device wall; 11 is the movable support; 12 is shallow biogas; 13 is silty clay. Detailed Implementation

[0034] The present invention will now be further described with reference to the accompanying drawings.

[0035] Reference Figures 1-12 An expansion-type endothermic liquid purification integrated device for collecting shallow biogas includes a grouting reinforcement system 1, a double-piston reciprocating magnetic control cooler 4, a first liquefied gas collection system 5, a second liquefied gas collection system 7, and an air intake system 8.

[0036] Grouting reinforcement system 1 (such as...) Figure 5 The system includes a mud pump controller 101, a mud delivery pipe 102, a mud pump 103, a grouting sealing ring 104, a grout suction pipe 105, a spray pipe 106, a grout suction port 107, a grouting built-in threaded bevel gear 108, a mud bucket 109, mud 110, a first motor 111, a grouting drive shaft 112, and a grouting bevel gear 113.

[0037] The mud pump controller 101 is installed on the top of the device housing and is used to control the mud pump 103 to draw mud 110 from the mud tank 109 through the suction pipe 105. The mud 110 is filled with biogas bubbles along the conveying pipe 102 through the spray pipe 106 with inserted bladder-shaped biogas bubbles.

[0038] The surface of the shotcrete pipe 106 is threaded, and the upper end is fitted with a grouting sealing ring 104, which fits tightly against the inner wall of the grout delivery pipe 102 to prevent grout 110 leakage. The lower end thread meshes with the internal thread of the grout-embedded bevel gear 108. The rotation of the grout-embedded bevel gear 108 drives the shotcrete pipe 106 to screw in and out.

[0039] The grouting bevel gear 113 at the lower end of the first motor 111 meshes with the left end of the grouting drive shaft 112, and the right end of the grouting drive shaft 112 meshes with the grouting built-in threaded bevel gear 108. The first motor 111 drives the grouting drive shaft 112 to rotate through the grouting bevel gear 113, thereby causing the grouting built-in threaded bevel gear 108 to rotate. That is, the rotation of the first motor 111 is converted into the vertical movement of the grouting pipe 106.

[0040] In this embodiment, the cooling equipment uses a double-piston reciprocating magnetically controlled cooler 4. Of course, other cooling methods can also be used, as long as they can achieve the cooling temperature required for liquefied methane and carbon dioxide. The double-piston reciprocating magnetically controlled cooler 4 (such as...) Figure 6 , 7 (As shown in 8 and 9) includes a steel wire mesh 402, a magnet 403, a hollow buffer rubber ball 404, a high-temperature resistant rubber 405, a low-temperature resistant rubber anti-collision strip 406, a cooling copper wall 407, a transmission rod 408, a passive bevel gear 409, a honeycomb heat dissipation mesh 410, a thermally broken aluminum alloy 411, a driving bevel gear 412, a heat dissipation copper pipe 413, a small cylinder 414, a large cylinder 415, a heat dissipation copper sheet 416, a second motor 419, a small piston 420, and a large piston 421.

[0041] There are two pieces of wire mesh 402, which are fixed in the common area where the large air cylinder 415 and the small air cylinder 414 meet on the left and right sides, respectively, for heat dissipation.

[0042] Magnet 403 is located inside the hollow buffer rubber ball 404 and is connected in series with the transmission rod 408, so that magnet 403 can rotate with transmission rod 408.

[0043] The hollow buffer rubber ball 404 is a sealed device with a built-in magnet 403 located on the central axis formed by the transmission rod 408. This is to prevent the magnet 403 from directly colliding with the large piston 421 and causing damage.

[0044] There are two pieces of high-temperature resistant rubber 405, which are glued to both ends of the thermally broken aluminum alloy 411 at the large cylinder 415. They are attached to the wire mesh 402 and the low-temperature resistant rubber anti-collision strip 406 to increase the friction between the large piston 421 and the large cylinder 415, thereby achieving the purpose of deceleration.

[0045] There are two low-temperature resistant rubber anti-collision strips 406, which are respectively attached to the junction of the wire mesh 402 and the small cylinder 414 on the left and right sides. They are distributed in a mesh pattern and do not affect the gas exchange between the large cylinder 415 and the small cylinder 414, preventing the small piston 420 from directly colliding with the wire mesh 402.

[0046] The cooling copper wall 407, located on the outermost side of the double-piston reciprocating magnetic control cooler 4, is ring-shaped and welded to the thermally broken aluminum alloy 411 on the outside of the large air cylinder 415, and is used to absorb external heat.

[0047] The transmission rod 408 has a bevel gear 409 at its end that meshes with a bevel gear 412. The rod body passes through a honeycomb heat dissipation mesh 410, a hollow buffer rubber ball 404, and a magnet 403, and is surrounded by the honeycomb heat dissipation mesh 410.

[0048] The passive bevel gear 409 is connected to the end of the transmission rod 408 and meshes with the active bevel gear 412.

[0049] A honeycomb heat dissipation mesh 410 is installed around the center of the device. It is cylindrical with a portion of the center hollowed out to accommodate the bevel gear 412 and to provide a channel for the transmission rod 408 for heat dissipation of the dual-piston reciprocating magnetic control cooler 4.

[0050] The thermally broken aluminum alloy 411 is divided into three parts. One part is located on the outermost thermally broken aluminum alloy 411 with a steel wire mesh 402 inside. Another part is located on the inner side, where the thermally broken aluminum alloy 411 and the heat dissipation copper pipe 413 form a large atmosphere cylinder 415 to insulate heat. The third part is located below the honeycomb heat dissipation mesh 410, in the shape of a disc, and is welded to the thermally broken aluminum alloy of the large atmosphere cylinder to prevent the heat released by the honeycomb heat dissipation mesh 410 from entering the liquefied gas collection system.

[0051] The active bevel gear 412 is located at the center of the entire device, connected to the second motor 419, and meshes with the first bevel gear 409 at one end of the transmission rod 408.

[0052] The heat dissipation copper pipe 413 is located around the honeycomb heat dissipation mesh 410 and is distributed in a ring. It is welded with the thermally broken aluminum alloy 411 to form a large air cylinder 415.

[0053] The small cylinder 414 is ring-shaped and fixed to the outside of the large cylinder 415. It is surrounded by a cooling copper wall 407 and a portion of the thermally broken aluminum alloy 411 and is used for the reciprocating motion of the small piston 420.

[0054] The large cylinder 415 is ring-shaped and located between the honeycomb heat dissipation mesh 410 and the small cylinder 414. It is surrounded by a heat dissipation copper pipe 413 and a thermally broken aluminum alloy 411 and is used for the reciprocating motion of the large piston 421.

[0055] The heat dissipation copper fins 416 are welded to the upper outer side of the atmospheric cylinder 415, and are vertically shaped and circumferentially distributed.

[0056] The second motor 419 is located above the center of the double-piston reciprocating magnetically controlled cooler 4. The driving bevel gear 412 at the lower end of the second motor 419 is connected to the horizontally placed passive bevel gear 409, which is used to drive the double-piston reciprocating magnetically controlled cooler 4 to work.

[0057] The small piston 420 includes a variable resistance plate and cryogenic copper. It is located inside the small cylinder 414 and its purpose is to control the thrust generated by the compressed helium. When the thrust reaches the calibrated value, the compressed helium expands inside the small cylinder 414.

[0058] The large piston 421 consists of a powerful magnet, an insulating sealing sleeve, and tungsten steel. Located inside the large atmospheric cylinder 415, it compresses the helium gas within the cylinder through reciprocating motion. The working principle of the dual-piston reciprocating magnetron chiller 4 includes the following steps:

[0059] (1) The second motor 419 is turned on by the four-motor controller 9. The rotation of the active bevel gear 412 at the tail of the motor drives the transmission rod 408, which is integrated with the passive bevel gear 409, to rotate. This drives the magnet 403 to rotate around the transmission rod 408 as the axis, so that the large piston 421 can be attracted or repelled by the magnet 403.

[0060] (2) When the large piston 421 is attracted by one end of the magnet 403, the large piston 421 slides along the large cylinder 415 and approaches the attracted end. Due to the closed space formed between the large piston 421 and the small piston 420, when the large piston 421 slides close to the attracted end of the magnet 403, the closed space will be compressed, and the helium gas in the closed space will be squeezed. The helium gas in the closed space releases heat because its volume is compressed. The released heat is dissipated to the outside of the cooler through the honeycomb heat dissipation mesh 410 and the heat dissipation copper pipe 413.

[0061] (3) When the helium gas compressed in the above-mentioned sealed space generates a thrust greater than the resistance provided by the variable resistance plate, the small piston 420 will be pushed. The variable resistance plate 420-1 on the small piston 420 will change direction because the small piston 420 is pushed, which will further reduce the resistance of the small piston 420 in the small cylinder 414, so that the small piston 420 can slide normally in the small cylinder 414 under the push of the helium gas.

[0062] (4) When the small piston 420 slides to the other end in the small cylinder 414, the helium gas that was squeezed in the previously sealed space expands in the small cylinder 414. The gas absorbs heat during the expansion process. Since the inner wall adjacent to the small cylinder 414 is made of thermally broken aluminum alloy 411, the heat exchange between the large cylinder 415 and the small cylinder 414 is isolated. Therefore, the heat required for expansion is absorbed from the inside of the liquefied gas collection system 5.

[0063] Steps (1) to (4) are a cooling process of a dual-piston reciprocating magnetic control cooler. Repeating the above process will achieve the cooling effect.

[0064] First liquefied gas collection system 5 (e.g.) Figure 11 As shown), for collecting carbon dioxide, it includes a first funnel-type liquid collection device 501, a first thermally broken aluminum alloy fixing frame 502, a first external fixing steel frame 503, a first Dewar flask 504, a first bottle outlet 505, a first inlet back pressure valve 506, a first outlet back pressure valve 507, and a gas transmission pipeline 508.

[0065] The first funnel-shaped liquid collection device 501 is connected to the air inlet pipe 801 on the left and the air delivery pipe 508 on the right. The refrigeration part of the double piston reciprocating magnetic control cooler 4 is located inside the funnel-shaped liquid collection device 501, and the heat dissipation part is outside the funnel-shaped liquid collection device 501.

[0066] The first thermal break aluminum alloy fixing bracket 502, consisting of four brackets, is welded inside the first funnel-type liquid collection device 501 and is used to fix the first double piston reciprocating magnetic control cooler 4.

[0067] The first external fixed steel frame 503 consists of four L-shaped steel frames, which are welded to the outside of the first funnel-type liquid collection device 501 and the inner wall of the device wall 10, and are used to fix the first liquefied gas collection system 5.

[0068] The first Dewar flask 504 is located at the lower collection port of the first funnel-type liquid collection device 501. The first Dewar flask 504 is connected to the collection port by a thread and is used to collect liquid carbon dioxide.

[0069] The first bottle outlet 505 is located on the outer wall 10 of the device and communicates with the inside of the device. It is used to exchange the first Dewar bottle 504 containing liquid carbon dioxide.

[0070] The first intake back pressure valve 506 is located between the intake pipe 801 and the intake port of the first funnel-type liquid collection device 501. It is used to control the entry of shallow biogas and prevent the gas in the first funnel-type liquid collection device 501 from flowing back.

[0071] The first gas back pressure valve 507 is located at the gas outlet of the first funnel-type liquid collection device 501. It is used for unidirectional delivery of purified biogas and can be used to control the gas pressure of the delivered gas.

[0072] The working principle of the first liquefied gas collection system 5 is as follows:

[0073] Natural biogas 12 enters the first funnel-type liquid collection device 501 through the first inlet back pressure valve 506 along the inlet pipe 801. Since the gas pressure in the first funnel-type liquid collection device 501 does not reach the output gas pressure of the first outlet back pressure valve 507, the shallow biogas 12 will be retained in the first funnel-type liquid collection device 501. Since the shallow biogas 12 contains a large amount of carbon dioxide, the carbon dioxide in the retained shallow biogas 12 is liquefied by the double piston reciprocating magnetic control cooler 4. The liquefied carbon dioxide is collected through the first Dewar flask 504, thereby achieving the purification effect.

[0074] The second liquefied gas collection system 7 is used to collect methane and includes a second funnel-type liquid collection device 701, a second thermally broken aluminum alloy fixing frame 702, a second external fixing steel frame 703, a second Dewar flask 704, and a second bottle outlet 705 (the positions and functions of the existing components are the same as those of the liquefied gas collection system 5).

[0075] Intake system 8 (such as) Figure 11 (As shown) includes an intake pipe 801, a pressure gauge 802, an intake sealing ring 803, an external threaded intake pipe 804, an internal threaded bevel gear 805, a fourth motor 806, an intake drive shaft 807, and an intake bevel gear 808.

[0076] The air intake pipe 801 has one end adjacent to the first air intake back pressure valve 301, and the other end has an externally threaded air intake pipe 804 for introducing shallow biogas 12 from the bladder-shaped biogas bubbles.

[0077] The pressure gauge 802 is fixed on the air inlet pipe 801, with the gauge head located outside the device wall 10, so as to facilitate direct observation of whether the external threaded air inlet pipe 803 enters the bladder-shaped biogas bubble and whether the shallow biogas inside the bladder-shaped biogas bubble is fully collected.

[0078] The air intake sealing ring 803 is fixed to the upper end of the external threaded air intake pipe 804. It is completely fitted to the inner wall of the air intake pipe 801 to prevent shallow biogas 12 from leaking.

[0079] The external threaded air inlet pipe 804 has an external thread at its lower end that matches the internal thread of the built-in threaded bevel gear 805. The transmission shaft 807 is driven by the bevel gear 808 at the lower end of the motor 806, which can screw the external threaded air inlet pipe 804 into the shallow biogas 12 in the shallow soil layer.

[0080] The intake internal threaded bevel gear 805 is tightly engaged with the external thread of the external threaded intake pipe 804. The intake drive shaft 807 drives the intake internal threaded bevel gear 805 to rotate horizontally, thereby controlling the extension and retraction of the external threaded intake pipe 804.

[0081] The fourth motor 806 is located to the lower left of the second funnel-shaped liquid collection device 701 and is fixed inside the device wall 10 by a fixed bracket. The intake bevel gear 808 at the end of the fourth motor 806 meshes with the intake drive shaft 807 to drive the external threaded intake pipe 804.

[0082] The intake drive shaft 807 is located to the right of the external threaded intake pipe 804. One end of the intake drive shaft 807 meshes with the intake bevel gear 808 at the lower end of the fourth motor 806, and the other end meshes with the internal threaded bevel gear 805, thereby driving the intake.

[0083] The intake bevel gear 808 is located at the end of the fourth motor 806 and meshes with the gear of the intake drive shaft 807 to drive the intake drive shaft 807 for transmission.

[0084] The working principle of intake system 8 is as follows:

[0085] The fourth motor 806 is started by the four-motor controller 9, causing its tail-end intake bevel gear 808 to drive the intake drive shaft 807 to rotate. The intake drive shaft 807 then drives the internal intake threaded bevel gear 805 to rotate. The rotation of the internal intake threaded bevel gear 805 controls the extension of the external threaded intake pipe 804, which gradually moves downwards into the underground marsh bubble. When the pressure gauge 802 starts to read, indicating that the external threaded intake pipe 804 has entered the underground marsh bubble, the motor 806 stops the external threaded intake pipe 804 from moving downwards. (This is a determination of whether the intake pipe has entered the marsh bubble.)

[0086] The four-motor controller 9 is used to control the rotation speed and direction of the second motor 419, the third motor 619, the fourth motor 806 and the first motor 111.

[0087] The operation of the device in this embodiment includes the following steps:

[0088] Step 1: Lower the external threaded air inlet pipe 804;

[0089] This is the workflow of the external threaded air intake pipe 804 in the air intake system 8 moving down into the bladder-like biogas bubble. The fourth motor 806 is started by the four-motor controller 9, which causes the air intake bevel gear 808 at its tail end to drive the air intake drive shaft 807 to rotate. The air intake drive shaft 807 then drives the internal threaded bevel gear 805 to rotate. The rotation of the internal threaded bevel gear 805 controls the extension of the external threaded air intake pipe 804, and the external threaded air intake pipe 804 gradually moves down into the interior of the underground bladder-like biogas bubble.

[0090] Step 2: Pre-cooling the inside of the funnel-type liquid collection device 501 and the funnel-type liquid collection device 701;

[0091] The four-motor controller 9 controls the second motor 419 to start the two double-piston reciprocating magnetically controlled coolers 4 to pre-cool the inside of the funnel-type liquid collection device 501 and the funnel-type liquid collection device 701.

[0092] Step 3: Cooling and purification

[0093] Carbon dioxide in the shallow biogas 12 of the liquefied gas collection system 5 is cooled by a double-piston reciprocating magnetically controlled cooler 4.

[0094] High-pressure shallow biogas 12 enters the funnel-shaped liquid collection device 501 through the air inlet pipe 801. The rotation frequency of the second motor 419 is increased by the four-motor controller 9, thereby accelerating the cooling rate of the double-piston reciprocating magnetic control cooler 4. Since the carbon dioxide concentration in the shallow biogas 12 is relatively high and the liquefaction temperature of carbon dioxide is higher than that of methane, the carbon dioxide can be liquefied first by the double-piston reciprocating magnetic control cooler 4, thereby achieving the purification effect.

[0095] Step 4: Purified biogas transportation

[0096] The purified biogas is discharged from the first outlet back pressure valve 507 on the right side of the first liquefied gas collection system 5 and enters the second liquefied gas collection system 7 along the gas transmission pipeline 508.

[0097] Due to the one-way ventilation and constant pressure release characteristics of the back pressure valve, the purified biogas in the first funnel-type liquid collection device 501 will be retained. When the purified biogas in the first funnel-type liquid collection device 501 reaches a certain pressure, the first outlet back pressure valve 507 opens, and the purified biogas in the first funnel-type liquid collection device 501 is introduced into the gas transmission pipeline 508.

[0098] Step 5: Methane liquefaction

[0099] The purified biogas enters the funnel-shaped liquid collection device 701 in the liquefied gas collection system 7 through the gas transmission pipeline 508. The purified biogas is cooled and liquefied by the second double piston reciprocating magnetic control cooler 4. The second double piston reciprocating magnetic control cooler 4 needs to liquefy methane at a lower temperature and collects the liquid methane in a Dewar flask 704.

[0100] Step 6: Fill the bladder-like biogas bubble with mud (requires the grouting reinforcement system 1 and the air intake system 8 to work together).

[0101] When the pressure gauge 802 reading decreases, it indicates a reduction in the content of shallow underground biogas 12. At this point, the first motor 111 is activated via the four-motor controller 9 to control the extension of the external threaded spray pipe 106 until it penetrates the ground. Simultaneously, the mud pump 103 is activated via the mud pump controller 101 to draw mud 110 from the mud tank 109 and transport it along the slurry pipe 102 to the external threaded spray pipe 106. If the mud 110 in the mud tank 109 begins to decrease, it indicates that the external threaded spray pipe 106 has descended into the bladder-like biogas bubbles in the shallow soil layer. At the same time, the fourth motor 806 is controlled by the four-motor controller 9 to move the external threaded air inlet pipe 804 back into the device. Simultaneously, the first motor 111 is shut off to stop the external threaded spray pipe 106 from descending, allowing the mud 110 to fill and solidify the underground environment until mud 110 flows out of the opening left by the ground air inlet pipe, indicating that the filling is complete. Then, the mud pump 103 is shut off to stop the continued delivery of mud 110.

[0102] Step 7: End of construction

[0103] The first motor 111 is started by the four-motor controller 9 to move the external threaded spray pipe 106 back into the device. The second motor 419 and the third motor 619 are shut off by the four-motor controller 9, so that the two double-piston reciprocating magnetically controlled coolers 4 stop cooling. Then, the first dewar 504 and the second dewar 704 are replaced from the first bottle outlet 505 and the second bottle outlet 705, respectively, and the liquefied methane in the second dewar 704 is sealed and stored cold.

[0104] Step 8: Cleaning of grout delivery pipe 102 (requires the cooperation of grouting reinforcement system 1)

[0105] After rinsing the mud tank 109 clean, pour clean water into the tank and start the mud pump 103 by controlling the mud pump controller 101. The mud pipe 105 draws clean water from the mud tank 109 through the mud port 107 and passes it through the mud pump 103 to the external threaded spray pipe 106 via the mud delivery pipe 102 to clean the entire mud reinforcement system 1, preventing the solidification of residual mud 110 in the pipe and avoiding blockage during the next use.

[0106] The scheme of this embodiment can extract biogas from bladder-shaped biogas bubbles at different burial depths. The fourth motor 806 is started by the four-motor controller 9, which drives the intake drive shaft 807 to rotate through the intake bevel gear 808 at its tail end. The intake drive shaft 807 then drives the intake internal threaded bevel gear 805 to rotate. The rotation of the intake internal threaded bevel gear 805 controls the extension and retraction of the external threaded intake pipe 804, thereby extracting shallow biogas from bladder-shaped biogas bubbles at different burial depths. This realizes a working mode that can flexibly control bladder-shaped biogas bubbles at different burial depths during actual construction.

[0107] The device in this embodiment allows for flexible adjustment of the gas liquefaction temperature and employs magnetic control for cooling and liquefaction. The dual-piston reciprocating magnetically controlled cooler 4 utilizes the physical principle of gas compression releasing heat and expansion absorbing heat. When the large piston 421 is attracted by the magnet 403, it will move closer to the magnet 403. At this time, the variable-direction resistance plate on the small piston 420 provides some resistance to the cylinder wall of the small cylinder 414. Therefore, when the helium gas between the first large piston 421 and the first small piston 420 is compressed, it will not immediately push the first small piston 420. At this time, the helium gas will release heat when compressed, and the generated heat will be efficiently dissipated through the heat dissipation material. When the helium gas between the large piston 421 and the small piston 420 is compressed to a certain pressure, the thrust generated by this pressure is greater than the resistance generated by the variable-direction resistance plate 420. Because the variable-direction resistance plate changes direction, the resistance decreases sharply, and the resulting thrust pushes the small piston 420 into a near-circular motion. Simultaneously, the compressed helium gas expands in the small cylinder 414. This expansion absorbs heat, and the small cylinder 414 absorbs heat from the funnel-shaped liquid collection device 501, thereby lowering the temperature inside the funnel-shaped liquid collection device 501. This avoids the problems of slow cooling speed and large temperature limitations associated with cooling methods that use refrigerant to remove heat, enabling flexible and efficient adjustment of the device's cooling temperature in engineering applications.

[0108] The soil cavities formed after the release of shallow biogas are filled with slurry to prevent ground subsidence. The first motor 111 in the grouting reinforcement system 1 drives the grouting drive shaft 112 via its tail-end grouting bevel gear 113. The drive shaft 112 then drives the internal threaded bevel gear 108, which in turn controls the extension of the spray pipe 106 until it penetrates the ground. Simultaneously, the slurry pump controller 101 starts the slurry pump 103, drawing slurry 110 from the slurry tank 109 and conveying it through the slurry pipe 102 to the spray pipe 106 to fill the soil cavities. This prevents the potential for ground collapse due to changes in the stress structure of the soil cavities formed after the release of shallow biogas.

[0109] The embodiments described in this specification are merely examples of implementations of the inventive concept and are for illustrative purposes only. The scope of protection of this invention should not be considered limited to the specific forms described in these embodiments; rather, it extends to equivalent technical means conceived by those skilled in the art based on the inventive concept.

Claims

1. An expansion-type endothermic liquid purification integrated device for collecting shallow biogas, characterized in that, The integrated device includes a housing, a grouting and reinforcement system for backfilling soil cavities formed after shallow biogas release, an air intake system for connecting the shallow biogas, a cooling device for cooling the passing biogas, a first liquefied gas collection system for collecting liquefied carbon dioxide, and a second liquefied gas collection system for collecting liquefied methane. The grouting and reinforcement system, air intake system, cooling device, first liquefied gas collection system, and second liquefied gas collection system are located inside the housing. The air intake pipe of the air intake system is connected to the first liquefied gas collection system, and the first liquefied gas collection system is connected to the second liquefied gas collection system through a gas transmission pipe. The cooling section of the cooling device is located inside the first liquefied gas collection system and the second liquefied gas collection system. The cooling equipment adopts a double-piston reciprocating magnetic control cooler, which includes a steel wire mesh, magnets, hollow buffer rubber balls, high-temperature resistant rubber, low-temperature resistant rubber anti-collision strips, cooling copper wall, transmission rod, passive bevel gear, honeycomb heat dissipation mesh, thermally broken aluminum alloy, active bevel gear, heat dissipation copper pipe, small cylinder, large cylinder, heat dissipation copper sheet, second motor, small piston and large piston; Two steel wire meshes are fixed in the common area where the large and small cylinders meet on the left and right sides. The magnet is located inside the hollow buffer rubber ball and is connected in series with the transmission rod so that the magnet can rotate with the transmission rod. The hollow buffer rubber ball is a sealed device and is located on the central axis formed by the transmission rod. Two high-temperature resistant rubber pieces are glued to both ends of the thermally broken aluminum alloy at the large cylinder and are in contact with the steel wire mesh and the low-temperature resistant rubber anti-collision strip. Two low-temperature resistant rubber anti-collision strips are respectively attached to the junction of the steel wire mesh and the small cylinder on the left and right sides. The low-temperature resistant rubber anti-collision strips are distributed in a mesh pattern. The cooling copper wall is located in the double piston reciprocating magnetic control system. The outermost part of the cooler is ring-shaped and fixed to the thermal break aluminum alloy on the outside of the large cylinder to absorb external heat. The passive bevel gear at the end of the transmission rod meshes with the active bevel gear. The rod body passes through a honeycomb heat dissipation mesh, a hollow buffer rubber ball, and a magnet, and is surrounded by the honeycomb heat dissipation mesh. The honeycomb heat dissipation mesh is installed around the center of the device, is cylindrical, and has a portion of its center hollowed out to accommodate the active bevel gear and to provide a channel for the transmission rod to dissipate heat from the dual-piston reciprocating magnetically controlled cooler. The active bevel gear is located at the center of the entire device and is connected to the output shaft of the second motor and meshes with the passive bevel gear at one end of the transmission rod. The heat dissipation copper pipes are arranged in a ring around the periphery of the honeycomb heat dissipation mesh. The heat dissipation copper pipes and the thermally broken aluminum alloy are fixed to form a large cylinder. The small cylinder is fixed in a ring around the outside of the large cylinder and is surrounded by a cooling copper wall and part of the thermally broken aluminum alloy. It is used for the reciprocating motion of the small piston. The large cylinder is located in a ring between the honeycomb heat dissipation mesh and the small cylinder. It is surrounded by heat dissipation copper pipes and thermally broken aluminum alloy. It is used for the reciprocating motion of the large piston. The heat dissipation copper plates are fixed to the upper part of the outside of the large cylinder in a vertical plate shape and are distributed circumferentially. The small piston includes a variable resistance plate and low-temperature copper. The small piston is located in the small cylinder and is used to control the thrust generated by compressing helium. When the thrust reaches the calibrated value, the compressed helium expands in the small cylinder. The large piston includes a strong magnet, an insulating sealing sleeve and tungsten steel. The large piston is located in the large cylinder and compresses the helium in the large cylinder through reciprocating motion.

2. The expansion-type endothermic liquid purification integrated device for collecting shallow biogas as described in claim 1, characterized in that, The grouting reinforcement system includes a mud pump controller, a grout delivery pipe, a mud pump, a grout suction pipe, a grout spraying pipe, a grout suction port, a mud tank, and a grouting up-and-down drive assembly. The mud pump controller is installed at the top of the device housing and is used to control the mud pump to draw mud from the mud tank through the grout suction pipe. The mud flows along the grout delivery pipe and is filled with biogas bubbles through the spraying pipe with inserted bladder-shaped biogas bubbles. The mud pump controller is connected to the control end of the mud pump. The inlet of the mud pump is connected to the outlet of the grout suction pipe. The inlet of the grout suction pipe is connected to the bottom outlet of the mud tank. The outlet of the mud pump is connected to the upper end of the grout delivery pipe. The spraying pipe is tightly fitted to the inner wall of the grout delivery pipe and can be movably connected up and down. The spraying pipe is connected to the grouting up-and-down drive assembly for driving the spraying pipe up and down.

3. The expansion-type endothermic liquid purification integrated device for collecting shallow biogas as described in claim 2, characterized in that, The grouting up-and-down drive assembly includes a grouting built-in threaded bevel gear, a first motor, a grouting drive shaft, and a grouting bevel gear. The upper end of the grouting pipe is fitted with a grouting sealing ring that fits tightly against the inner wall of the grouting pipe to prevent grout leakage. The lower end thread of the grouting pipe meshes with the internal thread of the grouting built-in threaded bevel gear. The lower end of the output shaft of the first motor is equipped with a grouting bevel gear, which meshes with the left end of the grouting drive shaft. The right end of the grouting drive shaft meshes with the grouting built-in threaded bevel gear. The first motor drives the grouting drive shaft to rotate through the grouting bevel gear, thereby causing the grouting built-in threaded bevel gear to rotate. In other words, the rotation of the first motor is converted into the vertical movement of the grouting pipe.

4. The expansion-type endothermic liquid purification integrated device for collecting shallow biogas as described in claim 1, characterized in that, The thermally broken aluminum alloy is divided into three parts. One part is located on the outermost side of the thermally broken aluminum alloy with a steel wire mesh inside. Another part is located on the inner side of the thermally broken aluminum alloy and forms an atmospheric cylinder with the heat dissipation copper pipe to insulate heat. The third part is located below the honeycomb heat dissipation mesh, in the shape of a disc, and is welded to the thermally broken aluminum alloy of the atmospheric cylinder to prevent the heat released by the honeycomb heat dissipation mesh from entering the liquefied gas collection system.

5. The expansion-type endothermic liquid purification integrated device for collecting shallow biogas as described in any one of claims 1 to 3, characterized in that, The first liquefied gas collection system includes a first funnel-shaped liquid collection device, a first thermally broken aluminum alloy fixing frame, a first external fixing steel frame, a first Dewar flask, a first bottle outlet, a first inlet back pressure valve, and a first outlet back pressure valve. The air inlet of the first funnel-shaped liquid collecting device is connected to the air inlet pipe, and the air outlet of the first funnel-shaped liquid collecting device is connected to the inlet of the air supply pipe. The refrigeration part of the cooler is located inside the first funnel-shaped liquid collecting device, and the heat dissipation part of the cooler is outside the first funnel-shaped liquid collecting device. The first thermally broken aluminum alloy fixing frame is fixed inside the first funnel-shaped liquid collecting device for fixing the cooler. The first external fixing steel frame is fixed to the outside of the first funnel-shaped liquid collecting device and the inner wall of the device. The first Dewar flask is located at the lower collection port of the first funnel-shaped liquid collecting device for collecting liquid carbon dioxide. The first bottle removal port is located on the outer wall of the device and communicates with the inside of the device for replacing the first Dewar flask containing liquid carbon dioxide. The first inlet back pressure valve is located at the air inlet, and the first outlet back pressure valve is located at the outlet of the first funnel-shaped liquid collecting device.

6. The expansion-type endothermic liquid purification integrated device for collecting shallow biogas as described in any one of claims 1 to 3, characterized in that, The second liquefied gas collection system includes a second funnel-shaped liquid collection device, a second thermally broken aluminum alloy fixing frame, a second external fixing steel frame, a second Dewar flask, and a second bottle outlet. The inlet of the second funnel-shaped liquid collection device is connected to the outlet of the gas transmission pipeline. The refrigeration part of the cooler is located inside the second funnel-shaped liquid collection device, and the heat dissipation part of the cooler is outside the second funnel-shaped liquid collection device. The second thermally broken aluminum alloy fixing frame is fixed inside the second funnel-shaped liquid collection device to fix the cooler. The second external fixing steel frame is fixed to the outside of the second funnel-shaped liquid collection device and the inner wall of the device. The second Dewar flask is located at the lower collection port of the second funnel-shaped liquid collection device and is used to collect liquid methane. The second bottle outlet is located on the outer wall of the device and communicates with the inside of the device to replace the second Dewar flask containing liquid methane.

7. The expansion-type endothermic liquid purification integrated device for collecting shallow biogas as described in any one of claims 1 to 3, characterized in that, The air intake system includes an air intake pipe, a pressure gauge, an external threaded air intake pipe, and an air intake up-and-down drive assembly. One end of the air intake pipe is adjacent to the first air intake back pressure valve, and the other end of the air intake pipe contains the external threaded air intake pipe for introducing shallow biogas from the bladder-like biogas bubbles. The external threaded air intake pipe is connected to the air intake up-and-down drive assembly for driving the external threaded air intake pipe to move up and down. The pressure gauge is fixed on the air intake pipe, and the gauge head is located outside the device wall.

8. The expansion-type endothermic liquid purification integrated device for collecting shallow biogas as described in claim 7, characterized in that, The air intake system also includes an air intake sealing ring, which is fixed to the upper end of the external threaded air intake pipe and fits completely against the inner wall of the air intake pipe to prevent shallow biogas leakage.

9. The expansion-type endothermic liquid purification integrated device for collecting shallow biogas as described in claim 7, characterized in that, The intake up and down drive assembly includes an intake built-in threaded bevel gear, a fourth motor, an intake drive shaft, and an intake bevel gear. The lower end of the external threaded intake pipe has an external thread that matches the internal thread of the built-in threaded bevel gear. The built-in threaded bevel gear is located at one end of the intake drive shaft, and the other end of the intake drive shaft meshes with the intake bevel gear. The intake bevel gear is mounted on the output shaft of the fourth motor.

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