Septic tank methane collection and utilization equipment

Abstract

The present invention discloses a septic tank biogas collection and utilization device, which belongs to the technical field of septic tanks and includes a pre-buried tank and a biogas stove. The inner cavity of the pre-buried tank is divided into a first tank, a second tank and a third tank from left to right by two partitions. A floating cover type gas collecting unit is installed in the second tank. By setting the floating cover type gas collecting unit, the gas guide component and the toggle component, the utilization efficiency of the biogas is improved by adding structures such as the floating cover type gas collecting unit, the gas guide component and the gas storage bag without changing the original function of the septic tank. This design enables the biogas to be effectively collected and utilized as a resource, which not only effectively reduces environmental pollution, but also provides a renewable energy solution for rural residents. Through this device, biogas can be collected and used in daily life such as home heating and cooking, which greatly improves the comprehensive utilization value of the septic tank and avoids the waste of biogas in traditional septic tanks.

Description

Technical Field

[0001] The present invention relates to the technical field of septic tanks, and in particular to a septic tank methane collection and utilization device. Background Art

[0002] Traditional rural septic tanks are a common underground sewage treatment facility used for preliminary purification of domestic sewage. They usually have multiple compartments inside, allowing heavier solid matter to settle to the bottom, while grease and lighter impurities float on the top. In this anaerobic environment, microorganisms gradually decompose organic matter, reducing the risk of pollution. Since rural areas usually lack centralized sewage treatment systems, septic tanks have become important equipment for preventing soil and groundwater pollution.

[0003] However, rural areas generally face challenges such as strong dispersion, backward technology, and complex terrain, which makes domestic sewage treatment more difficult. Especially in relatively economically backward areas, there is a lack of conditions for toilet renovation and laying gas pipelines, and sewage treatment problems are particularly prominent. In addition, traditional sewage treatment methods usually regard the methane produced by septic tanks as waste and do not make full use of this energy, resulting in resource waste. Therefore, there is an urgent need to develop a blackwater resource utilization and treatment technology suitable for rural areas. Summary of the Invention

[0004] The purpose of the present invention is to propose a septic tank methane collection and utilization device in order to solve the problem that traditional sewage treatment methods usually regard the methane generated by septic tanks as waste and do not fully utilize this energy.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A septic tank methane collection and utilization device comprises a pre-buried tank and a methane stove. The inner cavity of the pre-buried tank is divided into a first tank, a second tank and a third tank from left to right by two partitions. A floating cover type gas collection unit is installed in the second tank.

[0007] The floating hood type gas collection unit includes a gas collection hood slidably mounted on the second tank, the gas collection hood slowly floats up as the amount of biogas produced increases, and the gas collection hood is connected to a gas guide assembly via a conveying pipe;

[0008] The air guide assembly includes a front air guide pipe and a rear air guide pipe, one end of each of which is equipped with a U-shaped water seal pipe filled with calcium hydroxide, and a toggle assembly is installed inside each of the front air guide pipe, the rear air guide pipe and the U-shaped water seal pipe, and the toggle assembly is moved left and right by the action of the methane flowing in the front air guide pipe;

[0009] It also includes an air storage bag installed at one end of the rear air guide pipe, and the air storage bag is connected to the biogas stove through the air supply pipe.

[0010] As a further description of the above technical solution:

[0011] The floating hood type gas collecting unit also includes a guide frame fixed on the inner wall of the second pool, a guide rod is slidably connected in the guide frame, the top of the guide rod is connected to the gas collecting hood, and extension pieces are fixed on both sides of the upper surface of the gas collecting hood, and both ends of the extension piece and the gas collecting hood are in contact with the inner wall of the second pool.

[0012] As a further description of the above technical solution:

[0013] The conveying pipe comprises an air delivery pipe installed on the air collecting hood, the outer surface of the air delivery pipe is slidingly sleeved with a connecting pipe, the top end of the connecting pipe is connected to the front air guide pipe, and the outer wall of the connecting pipe is fixedly connected to an overflow pipe.

[0014] As a further description of the above technical solution:

[0015] The top fixing sleeve of the overflow pipe is provided with a mounting ring, and the top of the mounting ring is fixed with a double-cone dispersion head via a support.

[0016] As a further description of the above technical solution:

[0017] The toggle assembly includes a variable-diameter air outlet pipe fixed in the front air duct, and six mounting seats are installed on the side of the inner wall of the front air duct close to the variable-diameter air outlet pipe. The six mounting seats are evenly divided into three groups, and the three groups of mounting seats are rotatably connected to the mounting shafts. Gears are fixed on the three mounting shafts, and the three gears are meshed with each other;

[0018] An impeller is also fixed on the mounting shaft close to one end of the variable-diameter air outlet pipe.

[0019] As a further description of the above technical solution:

[0020] A cam is also fixed on the mounting shaft away from one end of the variable diameter air outlet pipe;

[0021] A corresponding U-shaped rod is provided in the U-shaped water seal tube, and an opening seat is fixed on the inner top wall of the front air guide tube and the rear air guide tube. The two ends of the U-shaped rod are respectively inserted into the opening seats located in the front air guide tube and the rear air guide tube. The end of the U-shaped rod that penetrates into the front air guide tube is against the outer wall of the cam, and a shift rod is provided on the rod body part of the U-shaped rod in the U-shaped water seal tube.

[0022] As a further description of the above technical solution:

[0023] Directional air guide grooves are provided on both sides of the opening seat located in the front air duct, and both ends of the U-shaped rod are fixedly sleeved with abutment seats, and a second spring is installed on one side of the abutment seat, and one end of the second spring is connected to the opening seat.

[0024] As a further description of the above technical solution:

[0025] A slag discharge pipe is provided at the bottom of the outer wall of the U-shaped water seal pipe, a feeding pipe is provided on the U-shaped water seal pipe, and a sealing cover is threadedly connected to the slag discharge pipe and the feeding pipe.

[0026] As a further description of the above technical solution:

[0027] A liquid inlet pipe is provided on one side of the pre-buried pool, a liquid discharge pipe is provided on the other side of the pre-buried pool, a manure pipe is provided on one side wall of the first pool and the second pool, and openings adapted to the manure pipe are provided on both sides of the gas collecting hood.

[0028] As a further description of the above technical solution:

[0029] The pre-buried pool is equipped with a shielding cover, and the front air duct and the rear air duct are both connected to the shielding cover through hanging rods.

[0030] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0031] By setting up the floating cover gas collection unit, gas guide component and toggle component, the utilization efficiency of biogas is improved by adding structures such as the floating cover gas collection unit, gas guide component and gas storage bag without changing the original function of the septic tank. This design enables the effective collection and resource utilization of biogas, which not only effectively reduces environmental pollution, but also provides a renewable energy solution for rural residents. Through this device, biogas can be collected and used in daily life such as home heating and cooking, greatly improving the comprehensive utilization value of the septic tank and avoiding the waste of biogas in traditional septic tanks.

[0032] Furthermore, this device does not require additional electricity or mechanical power, greatly reducing the cost of system operation and the difficulty of maintenance. It is particularly suitable for rural areas with relatively lagging economic development, especially in areas where there is a lack of conditions for toilet renovation and gas pipeline laying. The low installation cost allows even rural families with limited financial resources to install and use this device.

[0033] At the same time, during the biogas collection stage, the biogas flowing into the front air duct is accelerated by the variable diameter outlet pipe and blown toward the impeller, causing it to rotate. Then, with the cooperation of the gears, the cam drives the U-shaped rod to swing in the U-shaped water seal pipe, thereby slightly flipping the calcium hydroxide in the pipe, thereby effectively removing hydrogen sulfide from the biogas. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It shows a schematic diagram of the overall structure in a planar state according to an embodiment of the present invention;

[0035] Figure 2 A schematic structural diagram of an air collecting hood according to an embodiment of the present invention is shown;

[0036] Figure 3 It shows a schematic diagram of the internal structure of a pre-buried pool after being cut open according to an embodiment of the present invention;

[0037] Figure 4 It shows a schematic diagram of the overall structure of the three-dimensional state provided by an embodiment of the present invention;

[0038] Figure 5 A schematic structural diagram of a U-shaped rod according to an embodiment of the present invention is shown;

[0039] Figure 6 The embodiment of the present invention provides Figure 1 Enlarged view of point A in the middle;

[0040] Figure 7 A schematic diagram of the internal structure of a cutaway U-shaped water seal tube according to an embodiment of the present invention is shown;

[0041] Figure 8 The embodiment of the present invention provides Figure 7 Enlarged view of point B in the middle;

[0042] Figure 9 A schematic structural diagram of an open shielding cover according to an embodiment of the present invention is shown.

[0043] Legend:

[0044] 10. Preburied pool; 11. First pool; 12. Second pool; 13. Third pool;

[0045] 20. Floating hood type gas collection unit; 21. Gas collection hood; 22. Delivery pipe; 221. Gas delivery pipe; 222. Connecting pipe; 223. Overflow pipe; 224. Double cone dispersion head; 23. Guide frame; 24. Guide rod; 25. Extension piece;

[0046] 30. Air guide assembly; 31. Front air guide pipe; 32. U-shaped water seal pipe; 33. Rear air guide pipe;

[0047] 40. Toggle assembly; 41. Variable diameter air outlet pipe; 42. Gear; 43. Impeller; 44. Cam; 45. U-shaped rod; 46. Opening seat; 47. Toggle lever; 48. Second spring; 49. Directional air guide slot;

[0048] 50. Biogas stove;

[0049] 60. Air storage bag;

[0050] 70. Shield. DETAILED DESCRIPTION

[0051] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0052] like Figure 1 - Figure 9 As shown, the present invention provides:

[0053] A septic tank methane collection and utilization device includes a pre-buried tank 10 and a methane stove 50. The inner cavity of the pre-buried tank 10 is divided into a first tank 11, a second tank 12, and a third tank 13 from left to right by two partitions. A liquid inlet pipe is provided on one side of the pre-buried tank 10, and a liquid discharge pipe is provided on the other side of the pre-buried tank 10. A manure pipe is provided on one side wall of the first tank 11 and the second tank 12. A floating cover-type gas collection unit 20 is installed in the second tank 12.

[0054] The floating hood type gas collecting unit 20 includes a gas collecting hood 21 slidably mounted on the second tank 12. The gas collecting hood 21 slowly floats up as the amount of biogas generated increases. The floating hood type gas collecting unit 20 also includes a guide frame 23 fixed to the inner wall of the second tank 12. A guide rod 24 is slidably connected to the guide frame 23. The top of the guide rod 24 is connected to the gas collecting hood 21. Extension pieces 25 are fixed on both sides of the upper surface of the gas collecting hood 21. Both ends of the extension piece 25 and the gas collecting hood 21 are in contact with the inner wall of the second tank 12.

[0055] Specifically, the other two ends of the gas collection hood 21 are away from the inner wall of the second tank 12, so that the excreta entering the first tank 11 can smoothly flow into the second tank 12 through the manure pipe after a certain period of hydraulic retention, and undergo anaerobic digestion in the second tank 12. The biogas generated during the anaerobic process will rise from the bottom of the tank and float to the liquid surface, and will always be collected under the gas collection hood 21. As the amount of biogas generated increases, the gas collection hood 21 slowly floats up;

[0056] In order to ensure that the gas collecting hood 21 is always located directly above the liquid surface and to prevent it from rising too high, a guide frame 23 is installed on the inner wall of the second pool 12, and a guide rod 24 is slidably installed in the guide frame 23, which is connected to the gas collecting hood 21 through the guide rod 24 to guide it. At the same time, a limited sliding groove is provided on the inner wall of the guide frame 23, and a limited sliding block adapted to the guide rod 24 is provided on one side of the guide rod 24, so that the gas collecting hood 21 can remain in this position after floating a certain distance and will not continue to rise.

[0057] In further detail, both sides of the air collecting hood 21 are provided with openings adapted to the manure pipe, so that the air collecting hood 21 will not be affected by the manure pipe when moving up and down.

[0058] like Figure 1 、 Figure 2 and Figure 3 As shown, the gas collecting hood 21 is connected to the gas guide assembly 30 through the delivery pipe 22. The delivery pipe 22 includes a gas delivery pipe 221 installed on the gas collecting hood 21. The outer surface of the gas delivery pipe 221 is slidably sleeved with a connecting pipe 222. When the gas collecting hood 21 moves up and down, the gas delivery pipe 221 can move up and down in the connecting pipe 222.

[0059] The air guide assembly 30 includes a front air guide pipe 31 and a rear air guide pipe 33. The top end of the connecting pipe 222 is connected to the front air guide pipe 31. One end of the front air guide pipe 31 and the rear air guide pipe 33 are both equipped with a U-shaped water seal pipe 32. The U-shaped water seal pipe 32 is filled with calcium hydroxide. A slag discharge pipe is provided at the bottom of the outer wall of the U-shaped water seal pipe 32. A feeding pipe is provided on the U-shaped water seal pipe 32. A sealing cover is threadedly connected to the slag discharge pipe and the feeding pipe.

[0060] An air storage bag 60 is installed at one end of the rear air guide pipe 33, and the air storage bag 60 is connected to the biogas stove 50 through an air supply pipe. Preferably, a gravity pressure relief valve is provided on the air storage bag 60. When the air pressure is too high, the valve automatically lifts to exhaust.

[0061] Specifically, the collected biogas enters the U-shaped water seal pipe 32 through the front air duct 31. The calcium hydroxide added to the U-shaped water seal pipe 32 removes hydrogen sulfide in the biogas. After a period of use, the waste residue in the U-shaped water seal pipe 32 is regularly cleaned through the slag discharge pipe. At the same time, calcium hydroxide needs to be added through the feeding pipe to maintain the normal operation of the equipment. The treated biogas enters the air storage bag 60 through the rear air duct 33 for storage. The air storage bag 60 is connected to the air collection hood 21 through the air duct and can be automatically inflated by air pressure. In particular, the top of the air storage bag 60 is equipped with a gravity pressure reducing valve. When the air pressure is too high, the valve automatically lifts to exhaust.

[0062] In particular, in order to allow excess biogas to be discharged, an overflow pipe 223 is fixedly connected to the outer wall of the connecting pipe 222. The top of the overflow pipe 223 is fixedly sleeved with a mounting ring, and the top of the mounting ring is fixed with a double-cone dispersion head 224 through a support.

[0063] Specifically, when the gas storage bag 60 is full, the excess biogas collected by the gas collecting hood 21 is discharged into the air through the overflow pipe 223. In particular, when the biogas is discharged outward through the top of the overflow pipe 223, the exhausted gas is guided by the double-cone dispersion head 224 so that it can be dispersed and discharged to the surroundings.

[0064] In further detail, Figure 1 、 Figure 7 and Figure 9 As shown, a toggle assembly 40 is commonly installed in the front air duct 31, the rear air duct 33 and the U-shaped water seal tube 32. The toggle assembly 40 is moved left and right by the action of the biogas flowing in the front air duct 31. The toggle assembly 40 includes a variable diameter air outlet pipe 41 fixed in the front air duct 31. Six mounting seats are installed on the side of the inner wall of the front air duct 31 near the variable diameter air outlet pipe 41. The six mounting seats are evenly divided into three groups. The three groups of mounting seats are all rotatably connected to the mounting shafts. Gears 42 are fixed on the three mounting shafts, and the three gears 42 are meshed with each other.

[0065] An impeller 43 is fixed to the mounting shaft at one end of the variable-diameter air outlet pipe 41, and a cam 44 is fixed to the mounting shaft at one end away from the variable-diameter air outlet pipe 41.

[0066] A corresponding U-shaped rod 45 is provided inside the U-shaped water seal tube 32. An opening seat 46 is fixed to the inner top wall of each of the front air duct 31 and the rear air duct 33. The two ends of the U-shaped rod 45 are respectively inserted into the opening seats 46 located in the front air duct 31 and the rear air duct 33. The end of the U-shaped rod 45 that penetrates into the front air duct 31 abuts against the outer wall of the cam 44. A lever 47 is provided on the rod body portion of the U-shaped rod 45 that is inside the U-shaped water seal tube 32.

[0067] Both ends of the U-shaped rod 45 are fixedly sleeved with a supporting seat, and a second spring 48 is installed on one side of the supporting seat, and one end of the second spring 48 is connected to the opening seat 46;

[0068] Specifically, the biogas is accelerated by the variable diameter outlet pipe 41 and blown toward the impeller 43, causing it to rotate, thereby driving the gear 42 to rotate. In particular, the number of teeth of the three gears 42 decreases in sequence, forming an acceleration gear set. When the gears 42 rotate, the cam 44 on the side of the gear 42 with a smaller number of teeth rotates, thereby continuing to press against the end of the U-shaped rod 45 in the front air duct 31.

[0069] It is worth noting that when the convex heel end of the cam 44 contacts the end of the U-shaped rod 45, it will not drive the position of the U-shaped rod 45 to change. During the rotation process, the cam 44 gradually turns into a convex top end and contacts the U-shaped rod 45. During the process, it pushes the U-shaped rod 45 to move to the right, thereby allowing the U-shaped rod 45 to move inside the U-shaped water seal tube 32. It is worth noting that the movement range is smaller than the distance between the outer wall of the U-shaped rod 45 and the inner wall of the U-shaped water seal tube 32, so that when moving, the lever 47 only moves the calcium hydroxide, so that different layers of calcium hydroxide can be turned over, thereby removing the hydrogen sulfide contained in the flowing biogas;

[0070] When the cam 44 gradually rotates from the convex top end to the convex heel end in contact with the end of the U-shaped rod 45, the U-shaped rod 45 is gradually reset under the action of the second spring 48, and the calcium hydroxide is continuously flipped in the reciprocating process to improve the removal effect;

[0071] Furthermore, in order to reduce the flow rate of the accelerated biogas and make it flow smoothly into the U-shaped water seal pipe 32, directional air guide grooves 49 are opened on both sides of the opening seat 46 located in the front air duct 31. When the accelerated biogas blows towards the impeller 43, it drives the impeller 43 to rotate and the flow rate is also reduced under the influence of the impeller 43. At the same time, in the process of continuing to flow, part of the biogas will enter the directional air guide groove 49 from the side of the opening seat 46 close to the impeller 43, and flow out from the outlet of the directional air guide groove 49. The outlet is located on both sides of the opening seat 46 close to the inner wall of the front air duct 31, so that the biogas flowing out of the directional air guide groove 49 will blow towards the biogas flowing through the gap between the opening seat 46 and the inner wall of the front air duct 31, further reducing the flow rate of the biogas, so that it can smoothly enter the U-shaped water seal pipe 32 and contact with calcium hydroxide, thereby ensuring the effect of removing hydrogen sulfide.

[0072] In particular, in order to shield the pipeline, a shielding cover 70 is installed on the pre-buried pool 10, and the front air duct 31 and the rear air duct 33 are connected to the shielding cover 70 through a hanging rod. Preferably, an inspection door is connected to one side of the shielding cover 70 through a hinge. After opening the inspection door, it is convenient for personnel to discharge slag and feed materials;

[0073] In addition, the pipes, air storage bags 60 and other components used in the device are able to ensure sealing during use.

[0074] Specifically, when the septic tank methane collection and utilization equipment is working / in use:

[0075] Step 1: Device initialization and preprocessing

[0076] 1. Installation of the pre-buried pool 10: bury the pre-buried pool 10 underground, ensure that the first pool 11, the second pool 12, and the third pool 13 are clearly separated by partitions, connect the liquid inlet pipe (located on one side of the pre-buried pool 10) and the liquid discharge pipe (located on the other side) to ensure that excrement can flow.

[0077] 2. Installation of the floating hood type gas collecting unit 20: Install the guide frame 23 in the second tank 12, insert the guide rod 24 into the guide frame 23, and connect it to the lower surface of the gas collecting hood 21. Make sure that the extension pieces 25 on both sides of the gas collecting hood 21 fit well with the inner wall of the second tank 12, and leave openings at the other two ends to avoid the passage of the manure pipe.

[0078] 3. Assemble the air guide component 30: Fix the air pipe 221 to the top of the air collecting hood 21, and put the connecting pipe 222 on the outside of the air pipe 221 to ensure that the air pipe 221 can slide in the connecting pipe 222 when the air collecting hood 21 moves up and down. Then install the front air guide pipe 31, U-shaped water seal pipe 32, and rear air guide pipe 33, and add calcium hydroxide through the feeding pipe of the U-shaped water seal pipe 32, and seal the feeding pipe and slag discharge pipe.

[0079] 4. Connect the air storage bag 60 to the biogas stove 50: Connect the rear air duct 33 to the air storage bag 60, and connect the air storage bag 60 to the biogas stove 50 through the air supply pipe. Check whether the gravity pressure relief valve on the air storage bag 60 is flexible to ensure that it can automatically exhaust when the air pressure is too high.

[0080] 5. Installation of the shielding cover 70: Cover the shielding cover 70 above the embedded pool 10, fix the front air duct 31 and the rear air duct 33 through the hanging rod, and close the inspection door.

[0081] Step 2: Biogas Collection and Storage

[0082] 1. Excreta entry and anaerobic digestion: Excreta enters the first tank 11 through the liquid inlet pipe, and after hydraulic retention, flows into the second tank 12 through the manure pipe for anaerobic digestion.

[0083] 2. Biogas production and rising of the gas collecting hood 21: The biogas produced during the anaerobic process rises to the liquid surface and is collected by the gas collecting hood 21. As the amount of biogas increases, the gas collecting hood 21 rises along the guide rod 24 under the action of buoyancy. The limiting slide groove of the guide frame 23 prevents it from rising excessively.

[0084] 3. Biogas transportation and desulfurization treatment: Biogas enters the front air duct 31 through the gas transmission pipe 221 and the connecting pipe 222, and is accelerated by the variable diameter outlet pipe 41 to drive the impeller 43 to rotate: the impeller 43 drives the cam 44 to rotate through the gear set, pushing the U-shaped rod 45 to reciprocate, and the lever 47 flips the calcium hydroxide in the U-shaped water seal pipe 32 to remove hydrogen sulfide in the biogas.

[0085] 4. Biogas storage and overflow: The desulfurized biogas enters the gas storage bag 60 through the rear air duct 33. The gravity pressure reducing valve automatically adjusts the air pressure. If the gas storage bag 60 is full, the excess biogas is discharged to the surroundings through the overflow pipe 223 and the double-cone dispersion head 224.

[0086] Step 3: Biogas Utilization and Equipment Maintenance

[0087] 1. Biogas combustion and utilization: Open the valve of the biogas stove 50, and the biogas in the gas storage bag 60 is transported to the stove through the gas supply pipe for combustion.

[0088] 2. Regular replacement of desulfurizer: Open the slag discharge pipe of the U-shaped water seal pipe 32, clean the waste calcium hydroxide, and add new material through the feeding pipe.

[0089] 3. Equipment inspection and cleaning: Regularly check the sliding smoothness of the guide rod 24 and the guide frame 23, clean the debris at the opening of the gas collecting hood 21, and clean the sediment at the bottom of the buried pool 10 every year to ensure that the manure pipe is unobstructed.

[0090] 4. Safety inspection: Open the inspection door of the shielding cover 70, check the air guide assembly 30, the air storage bag 60 and the sealing of the pipeline, and repair the leaking points.

[0091] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A septic tank methane collection and utilization device, comprising a pre-buried tank (10) and a methane stove (50), wherein the inner cavity of the pre-buried tank (10) is divided into a first tank (11), a second tank (12) and a third tank (13) from left to right by two partitions, characterized in that: A floating cover type gas collecting unit (20) is installed in the second pool (12); The floating hood type gas collecting unit (20) comprises a gas collecting hood (21) slidably mounted on the second pool (12), the gas collecting hood (21) slowly floats upward as the amount of biogas generated increases, and the gas collecting hood (21) is connected to a gas guide assembly (30) via a conveying pipe (22); The air guide assembly (30) comprises a front air guide pipe (31) and a rear air guide pipe (33), one end of each of the front air guide pipe (31) and the rear air guide pipe (33) is equipped with a U-shaped water seal pipe (32), and the U-shaped water seal pipe (32) is filled with calcium hydroxide. A shifting assembly (40) is equipped inside the front air guide pipe (31), the rear air guide pipe (33) and the U-shaped water seal pipe (32), and the shifting assembly (40) is moved left and right by the action of the biogas flowing in the front air guide pipe (31); It also includes an air storage bag (60) installed at one end of the rear air guide pipe (33), and the air storage bag (60) is connected to the biogas stove (50) through an air supply pipe; The floating hood type gas collecting unit (20) further comprises a guide frame (23) fixed on the inner wall of the second pool (12), a guide rod (24) is slidably connected in the guide frame (23), the top end of the guide rod (24) is connected to the gas collecting hood (21), and extension pieces (25) are fixed on both sides of the upper surface of the gas collecting hood (21), and both ends of the extension piece (25) and the gas collecting hood (21) are in contact with the inner wall of the second pool (12); The delivery pipe (22) comprises an air delivery pipe (221) mounted on the air collecting hood (21); a connecting pipe (222) is slidingly sleeved on the outer surface of the air delivery pipe (221); the top end of the connecting pipe (222) is connected to the front air guide pipe (31); and an overflow pipe (223) is fixedly connected to the outer wall of the connecting pipe (222); The top of the overflow pipe (223) is fixed with a mounting ring, and the top of the mounting ring is fixed with a double-cone dispersion head (224) via a support. The toggle assembly (40) includes a variable diameter air outlet pipe (41) fixed in the front air guide pipe (31), and six mounting seats are installed on the side of the inner wall of the front air guide pipe (31) close to the variable diameter air outlet pipe (41). The six mounting seats are evenly divided into three groups, and the three groups of mounting seats are all rotatably connected with mounting shafts. Gears (42) are fixed on the three mounting shafts, and the three gears (42) are meshed with each other. An impeller (43) is also fixed on the mounting shaft near one end of the variable-diameter air outlet pipe (41); A cam (44) is also fixed on the mounting shaft at one end away from the variable-diameter air outlet pipe (41); A U-shaped rod (45) corresponding to the U-shaped water seal tube (32) is provided in the U-shaped water seal tube (32). An opening seat (46) is fixed on the inner top wall of the front air guide tube (31) and the rear air guide tube (33). The two ends of the U-shaped rod (45) are respectively inserted into the opening seats (46) located in the front air guide tube (31) and the rear air guide tube (33). One end of the U-shaped rod (45) that penetrates into the front air guide tube (31) abuts against the outer wall of the cam (44). A shifting rod (47) is provided on the rod body portion of the U-shaped rod (45) located in the U-shaped water seal tube (32).

2. A septic tank methane collection and utilization device according to claim 1, characterized in that: Directional air guide grooves (49) are provided on both sides of the opening seat (46) located in the front air guide pipe (31), and both ends of the U-shaped rod (45) are fixedly sleeved with abutment seats, and a second spring (48) is installed on one side of the abutment seat, and one end of the second spring (48) is connected to the opening seat (46).

3. The septic tank methane collection and utilization equipment according to claim 2, characterized in that: A slag discharge pipe is provided at the bottom of the outer wall of the U-shaped water seal pipe (32), a feeding pipe is provided on the U-shaped water seal pipe (32), and a sealing cover is threadedly connected to the slag discharge pipe and the feeding pipe.

4. The septic tank methane collection and utilization equipment according to claim 1, characterized in that: A liquid inlet pipe is provided on one side of the pre-buried pool (10), a liquid discharge pipe is provided on the other side of the pre-buried pool (10), a manure pipe is provided on one side wall of each of the first pool (11) and the second pool (12), and openings adapted to the manure pipe are provided on both sides of the gas collecting hood (21).

5. The septic tank methane collection and utilization equipment according to claim 4, characterized in that: The pre-buried pool (10) is equipped with a shielding cover (70), and the front air duct (31) and the rear air duct (33) are both connected to the shielding cover (70) via hanging rods.

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