Septic tank biogas collection and utilization equipment

Abstract

The invention discloses septic tank biogas collection and utilization equipment, and belongs to the technical field of septic tanks, the septic tank biogas collection and utilization equipment comprises an embedded tank and a biogas stove, an inner cavity of the embedded tank is sequentially divided into a first tank, a second tank and a third tank from left to right through two separators, and a floating cover type gas collection unit is mounted in the second tank; through the arrangement of the floating cover type gas collection unit, the gas guide assembly and the shifting assembly, on the premise that the original functions of the septic tank are not changed, the utilization efficiency of biogas is improved by adding the structures such as the floating cover type gas collection unit, the gas guide assembly and the gas storage bag, the biogas is effectively collected and recycled through the design, and the energy consumption is reduced. According to the device, the environment pollution is effectively reduced, a renewable energy solution is provided for rural residents, the biogas can be collected and used for daily life such as household heating and cooking through the device, the comprehensive utilization value of the septic tank is greatly improved, and meanwhile, the waste phenomenon of the biogas of a traditional septic tank is avoided.

Description

Technical Field

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

[0002] The traditional rural septic tank is a common underground sewage treatment facility used for preliminary purification of domestic sewage. It usually has multiple compartments inside, allowing heavier solid matter to settle to the bottom, while grease and lighter impurities float on the upper layer. In this anaerobic environment, microorganisms gradually decompose organic matter and reduce the risk of pollution. Since rural areas usually lack centralized sewage treatment systems, septic tanks have become an 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 backward economic 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 biogas produced by septic tanks as waste and do not make full use of this energy, resulting in waste of resources. Therefore, it is urgent 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, comprising a pre-buried tank and a methane stove, wherein 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 in sequence by two partitions, and a floating cover type gas collection unit is installed in the second tank;

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

[0008] The air guide assembly comprises a front air guide pipe and a rear air guide pipe, one end of the front air guide pipe and the rear air guide pipe are jointly equipped with a U-shaped water seal pipe, the U-shaped water seal pipe is filled with calcium hydroxide, and a toggle assembly is jointly equipped in 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 biogas 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 inside 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, a connecting pipe is slidingly sleeved on the outer surface of the air delivery pipe, the top end of the connecting pipe is connected to the front air guide pipe, and an overflow pipe is fixedly connected to the outer wall of the connecting 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 through 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 guide pipe, and six mounting seats are installed on the inner wall of the front air guide pipe near 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 with mounting shafts, and the three mounting shafts are fixed with gears, and the three gears are meshed with each other;

[0018] An impeller is also fixed on the mounting shaft near 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 U-shaped rod corresponding to the U-shaped water seal tube is provided in the U-shaped water seal tube, and opening seats are fixed on the inner top walls of the front air duct and the rear air duct. Both ends of the U-shaped rod are respectively inserted into the opening seats located in the front air duct and the rear air duct. One end of the U-shaped rod that penetrates into the front air duct abuts against the outer wall of the cam, and a lever is provided on the rod body part of the U-shaped rod located 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, one side of the abutment seat is installed with a second spring, 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 arranged at the bottom of the outer wall of the U-shaped water seal pipe, a feeding pipe is arranged 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 air 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 type gas collection unit, gas guide component and toggle component, the utilization efficiency of biogas is improved by adding structures such as the floating cover type gas collection unit, gas guide component and 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.

[0032] In addition, the device does not require additional electricity or mechanical power, which greatly reduces the cost of system operation and the difficulty of maintenance. It is particularly suitable for rural areas with relatively backward economic development, especially in some places where there are no conditions for toilet renovation and gas pipeline laying. The installation cost is low, so that even rural families with limited economic conditions can 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, so that it can effectively remove hydrogen sulfide in the biogas. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It shows a schematic diagram of the overall structure in a plane state provided by an embodiment of the present invention;

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

[0036] Figure 3 It shows a schematic diagram of the structure of the interior 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 in a three-dimensional state according to an embodiment of the present invention;

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

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

[0040] Figure 7 A schematic diagram of the internal structure of a U-shaped water seal pipe after being cut open according to an embodiment of the present invention is shown;

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

[0042] Figure 9 A schematic diagram of the structure after the shielding cover provided in an embodiment of the present invention is opened is shown.

[0043] Legend:

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

[0045] 20. Floating cover type gas collecting unit; 21. Gas collecting cover; 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. hole seat; 47. toggle rod; 48. second spring; 49. directional air guide slot;

[0048] 50. Biogas stove;

[0049] 60. Gas storage bag;

[0050] 70. Shading cover. Detailed implementation mode

[0051] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

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

[0053] A septic tank biogas collection and utilization device, including a pre-buried tank 10 and a biogas stove 50. The inner cavity of the pre-buried tank 10 is sequentially divided into a first tank 11, a second tank 12, and a third tank 13 from left to right by two partition members. 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. Manure passing pipes are provided on one side wall of the first tank 11 and the second tank 12, and a floating cover type gas collection unit 20 is installed in the second tank 12;

[0054] The floating cover type gas collection unit 20 includes a gas collection cover 21 slidably installed in the second tank 12. The gas collection cover 21 slowly floats upward as the biogas production increases. The floating cover type gas collection 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 in the guide frame 23. The top end of the guide rod 24 is connected to the gas collection cover 21. Both sides of the upper surface of the gas collection cover 21 are fixed with extension members 25. Both ends of the extension members 25 and the gas collection cover 21 are in contact with the inner wall of the second tank 12;

[0055] Specifically, the other two ends of the gas collection cover 21 are far from the inner wall of the second tank 12, so that the excrement entering the first tank 11 can smoothly flow into the second tank 12 through the manure passing pipe after a certain period of hydraulic retention, and anaerobic digestion is carried out 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 cover 21. As the biogas production increases, the gas collection cover 21 slowly floats upward;

[0056] To ensure that the gas collection hood 21 is always 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 tank 12, and a guide rod 24 is slidably installed inside the guide frame 23. The guide rod 24 is connected to the gas collection hood 21 to guide it. At the same time, a limiting chute is provided on the inner wall of the guide frame 23, and a limiting slider adapted to it is provided on one side of the guide rod 24, so that the gas collection hood 21 can stay at that position after floating up a certain distance and will not continue to rise and move;

[0057] Further in detail, openings adapted to the fecal pipe are provided on both sides of the gas collection hood 21, so that the gas collection hood 21 will not be affected by the fecal pipe when moving up and down.

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

[0059] The gas guide assembly 30 includes a front gas pipe 31 and a rear gas pipe 33. The top end of the connecting pipe 222 is connected to the front gas pipe 31. One ends of the front gas pipe 31 and the rear gas pipe 33 are jointly 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. Sealing covers are threadedly connected to both the slag discharge pipe and the feeding pipe;

[0060] A gas storage bag 60 is installed at one end of the rear gas pipe 33. The gas storage bag 60 is connected to a biogas stove 50 through a gas delivery pipe. Preferably, a gravity pressure reducing valve is provided on the gas 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 gas pipe 31. The hydrogen sulfide in the biogas is removed by the calcium hydroxide added in the U-shaped water seal pipe 32. After using for a period of time, 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 also needs to be put in through the feeding pipe to keep the equipment running normally. The treated biogas enters the gas storage bag 60 through the rear gas pipe 33 for storage, and the gas storage bag 60 is connected to the gas collection hood 21 through a gas pipe and can be automatically inflated by air pressure. In particular, a gravity pressure reducing valve is provided at the top of the gas storage bag 60. When the air pressure is too high, the valve automatically lifts to exhaust;

[0062] In particular, in order to discharge the excess biogas, an overflow pipe 223 is fixedly connected to the outer wall of the connecting pipe 222, and a mounting ring is fixedly sleeved on the top of the overflow pipe 223, and a double-cone dispersion head 224 is fixed on the top of the mounting ring 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 in all directions.

[0064] In further detail, Figure 1 , Figure 7 and Figure 9 As shown, the front air duct 31, the rear air duct 33 and the U-shaped water seal pipe 32 are equipped with a toggle assembly 40, and the toggle assembly 40 is moved left and right by 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, and six mounting seats are installed on one side of the inner wall of the front air duct 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 rotatably connected with mounting shafts, and gears 42 are fixed on the three mounting shafts, and the three gears 42 are meshed with each other;

[0065] An impeller 43 is also fixed on the mounting shaft near one end of the variable diameter air outlet pipe 41, and a cam 44 is also fixed on the mounting shaft away from one end of the variable diameter air outlet pipe 41;

[0066] A U-shaped rod 45 corresponding to the U-shaped water seal tube 32 is provided inside 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 lever 47 is provided on the rod body of the U-shaped rod 45 located inside the U-shaped water seal tube 32.

[0067] Both ends of the U-shaped rod 45 are fixedly sleeved with abutment seats, one side of which is mounted with a second spring 48, one end of which is connected to the opening seat 46;

[0068] Specifically, the biogas is accelerated by the variable diameter outlet pipe 41, and then blown to 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 to form an acceleration gear set, and when the gear 42 rotates, the cam 44 on one side of the gear 42 with a small number of teeth rotates, thereby continuing to abut against one end of the U-shaped rod 45 in the front air guide pipe 31;

[0069] It should be noted that when the convex root end of the cam 44 contacts the end of the U-shaped rod 45, the position of the U-shaped rod 45 will not be driven to change. During the rotation process, the cam 44 gradually changes to the convex top end contacting the U-shaped rod 45, and during this process, it will push against the U-shaped rod 45 to move to the right, so that the U-shaped rod 45 can move within the U-shaped water seal pipe 32. It should be noted 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 pipe 32, so that when moving, the lever 47 will only stir the calcium hydroxide, enabling different layers of calcium hydroxide to be turned over, thereby removing the attached hydrogen sulfide from the flowing biogas;

[0070] When the cam 44 gradually rotates from the convex top end to the convex root end contacting the end of the U-shaped rod 45, the U-shaped rod 45 gradually resets under the action of the second spring 48, and continuously turns over the calcium hydroxide during 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 provided on both sides of the orifice seat 46 located in the front guide pipe 31. When the accelerated biogas blows towards the impeller 43, while driving the impeller 43 to rotate, it will also reduce the flow rate under the influence of the impeller 43. At the same time, during the continuous flow process, part of the biogas will enter the directional air guide groove 49 from the side of the orifice seat 46 close to the impeller 43 and flow out from the outlet of the directional air guide groove 49. This outlet is located on both sides of the orifice seat 46 close to the inner wall of the front guide pipe 31, so that the biogas flowing out from the directional air guide groove 49 will blow towards the biogas flowing through the gap between the orifice seat 46 and the inner wall of the front guide pipe 31, further reducing the flow rate of the biogas and enabling it to smoothly enter the U-shaped water seal pipe 32 to contact the calcium hydroxide, thereby ensuring the effect of removing hydrogen sulfide.

[0072] Specifically, in order to shield the pipeline, a shielding cover 70 is assembled on the pre-buried pool 10. The front guide pipe 31 and the rear guide pipe 33 are both connected to the shielding cover 70 through hanging rods. Preferably, a maintenance door is connected to one side of the shielding cover 70 through a hinge. After opening the maintenance door, it is convenient for personnel to remove slag and feed materials;

[0073] In addition, components such as pipelines and gas storage bags 60 used in the equipment can ensure airtightness during use.

[0074] Specifically, when this septic tank biogas collection and utilization equipment is working / being used:

[0075] Step 1: Equipment initialization and preprocessing

[0076] 1. Installation of the embedded pool 10: Bury the embedded pool 10 underground, ensure that the first pool 11, the second pool 12, and the third pool 13 are clearly separated by the partition member, connect the inlet pipe (located on one side of the embedded pool 10) and the drain pipe (located on the other side), and ensure that the excrement can flow.

[0077] 2. Installation of the floating cover gas collection unit 20: Install the guide frame 23 in the second pool 12, insert the guide rod 24 into the guide frame 23, and connect it to the lower surface of the gas collection hood 21. Confirm that the extended parts 25 on both sides of the gas collection hood 21 are in contact with the inner wall of the second pool 12, and leave openings at the other two ends to avoid the fecal pipe.

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

[0079] 4. Connection between the gas storage bag 60 and the biogas stove 50: Connect the rear gas guide pipe 33 to the gas storage bag 60, and connect the gas storage bag 60 to the biogas stove 50 through the gas supply pipe. Check whether the gravity pressure reducing valve on the gas 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 gas guide pipe 31 and the rear gas guide pipe 33 through the hanging rod, and close the inspection door.

[0081] Step 2: Biogas collection and storage

[0082] 1. Entry of excrement and anaerobic digestion: The excrement enters the first pool 11 through the inlet pipe, and after hydraulic retention, it flows into the second pool 12 through the fecal pipe for anaerobic digestion.

[0083] 2. Biogas generation and floating of the gas collection hood 21: The biogas generated during the anaerobic process rises to the liquid surface and is collected by the gas collection hood 21. As the amount of biogas increases, the gas collection hood 21 floats upward along the guide rod 24 under the action of buoyancy, and the limit sliding groove of the guide frame 23 prevents it from rising excessively.

[0084] 3. Biogas transportation and desulfurization treatment: The biogas enters the front gas guide pipe 31 through the gas transmission pipe 221 and the connecting pipe 222, and after being accelerated by the variable-diameter outlet pipe 41, it blows the impeller 43 to rotate: The impeller 43 drives the cam 44 to rotate through the gear set, pushes the U-shaped rod 45 to reciprocate, and the dial rod 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 gas pipe 33, and the gravity pressure reducing valve automatically adjusts the air pressure. If the gas storage bag 60 is full, the excess biogas is discharged around through the overflow pipe 223 and the double-cone dispersion head 224.

[0086] Step 3: Biogas utilization and equipment maintenance

[0087] 1. Biogas combustion 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 supplement new materials through the feeding pipe.

[0089] 3. Equipment inspection and cleaning: Regularly check the smoothness of the sliding of the guide rod 24 and the guide frame 23, clean the sundries at the opening of the gas collection hood 21, and clean the sediment at the bottom of the embedded pool 10 every year to ensure the smoothness of the feces pipe.

[0090] 4. Safety maintenance: Open the maintenance door of the shielding cover 70, check the airtightness of the air guiding component 30, the gas storage bag 60 and the pipeline, and repair the leakage point.

[0091] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. An anaerobic digester biogas collection and utilization device, comprising a pre-buried pool (10) and a biogas stove (50). The inner cavity of the pre-buried pool (10) is sequentially divided into a first pool (11), a second pool (12) and a third pool (13) from left to right by two partition members. It is 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 up 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 the front air guide pipe (31) and the rear air guide pipe (33) are jointly equipped with a U-shaped water seal pipe (32), the U-shaped water seal pipe (32) is filled with calcium hydroxide, and a shifting assembly (40) is jointly 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.

2. The septic tank biogas collection and utilization equipment according to claim 1, characterized in that, 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) being slidably connected inside the guide frame (23), the top end of the guide rod (24) being connected to the gas collecting hood (21), extension pieces (25) being 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) being in contact with the inner wall of the second pool (12).

3. The septic tank biogas collection and utilization equipment according to claim 2, characterized in that, The delivery pipe (22) comprises an air delivery pipe (221) mounted on the air collecting hood (21); a connecting pipe (222) is slidably 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).

4. A septic tank biogas collection and utilization device according to claim 3, characterized in that, The top end of the overflow pipe (223) is fixedly sleeved with a mounting ring, and the top end of the mounting ring is fixed with a double-cone dispersion head (224) via a support.

5. A septic tank biogas collection and utilization device according to claim 1, characterized in that, The toggle assembly (40) comprises a variable diameter air outlet pipe (41) fixed in the front air guide pipe (31), and six mounting seats are installed on a side of the inner wall of the front air guide pipe (31) close to the variable diameter air outlet pipe (41), and the six mounting seats are evenly divided into three groups, and the three groups of mounting seats are all rotatably connected with mounting shafts, and the three mounting shafts are all fixed with gears (42), 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).

6. The septic tank biogas collection and utilization equipment according to claim 5, characterized in that, 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 thereto is provided inside the U-shaped water seal pipe (32). Open-hole seats (46) are fixedly arranged on the inner top walls of the front air guide pipe (31) and the rear air guide pipe (33). Two ends of the U-shaped rod (45) are respectively inserted into the open-hole seats (46) located inside the front air guide pipe (31) and the rear air guide pipe (33). One end of the U-shaped rod (45) penetrating into the front air guide pipe (31) abuts against the outer wall of a cam (44). A shift lever (47) is arranged on the rod body part of the U-shaped rod (45) inside the U-shaped water seal pipe (32).

7. The septic tank biogas collection and utilization equipment according to claim 6, characterized in that, Directional air guide grooves (49) are formed on both sides of the open-hole seat (46) located inside the front air guide pipe (31). Two ends of the U-shaped rod (45) are fixedly sleeved with abutting seats. A second spring (48) is installed on one side of each abutting seat. One end of the second spring (48) is connected to the open-hole seat (46).

8. A septic tank biogas collection and utilization device according to claim 7, characterized in that, A slag discharge pipe is arranged at the bottom of the outer wall of the U-shaped water seal pipe (32). A feeding pipe is arranged on the U-shaped water seal pipe (32). Sealing covers are threadedly connected to both the slag discharge pipe and the feeding pipe.

9. A septic tank biogas collection and utilization device according to claim 1, characterized in that, A liquid inlet pipe is arranged on one side of the embedded pool (10). A liquid discharge pipe is arranged on the other side of the embedded pool (10). Manure passing pipes are arranged on one side walls of the first pool (11) and the second pool (12). Openings adapted to the manure passing pipes are formed on both sides of the gas collecting hood (21).

10. A septic tank biogas collection and utilization device according to claim 9, characterized in that, A shielding cover (70) is assembled on the embedded pool (10). The front air guide pipe (31) and the rear air guide pipe (33) are both connected to the shielding cover (70) through hanging rods.

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