Gas pressure stabilizing device of black film biogas digester

Abstract

The invention relates to the technical field of biogas, and discloses a gas pressure stabilizing device of a black film biogas digester, which comprises a pressure stabilizing tank, one end of the pressure stabilizing tank is communicated with a conveying hose, the conveying hose is provided with a first control valve, the other end of the conveying hose is connected with a connecting mechanism, and the connecting mechanism is used for communicating the conveying hose with the black film biogas digester. The pressure stabilizing tank is provided with a pressure stabilizing mechanism used for adjusting and stabilizing the gas pressure of the black film biogas digester. Through pressure change in the pressure stabilizing tank, an outer piston plate and an inner piston plate in the pressure stabilizing mechanism move up and down along with pressure change, a piston rod slides in a penetrating pipe, biogas is discharged when a hollow position in a gas pipe is balanced when a gas outlet hole of the piston rod is aligned, and the internal pressure of the pressure stabilizing tank and the black film biogas digester is reduced; when the air inlet hole of the piston rod is aligned with the hollow position in the balance air pipe, biogas is input into the pressure stabilizing tank, and the internal pressure of the pressure stabilizing tank and the black film biogas digester is increased, so that the effect of dynamically adjusting the internal pressure of the black film biogas digester is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of biogas, in particular to a gas pressure stabilizing device for a black film biogas tank. Background Art

[0002] With the large-scale development of livestock and poultry farming in my country and the growing demand for organic waste treatment, black film biogas digesters have been widely used due to their low cost and excellent sealing properties. This technology produces biogas (mainly CH4 and CO2) through anaerobic fermentation. However, due to factors such as the composition of the raw materials and the ambient temperature, the air pressure in the black film biogas digester often fluctuates violently. The main reasons are: first, the instability of gas production. The temperature difference between day and night causes the gas to expand and contract, and the air pressure can fluctuate by 2-5kPa per day. Second, the sudden change in gas load. Concentrated gas use can easily cause negative pressure to deflate the digester body. When it is not in use, overpressure may cause the black film to rupture.

[0003] The current mainstream pressure stabilization solutions for livestock and poultry farms have the following shortcomings: First, the counterweight pressure relief valve can only relieve pressure in one direction, cannot cope with negative pressure conditions, and has poor adjustment accuracy (±10% error); second, the U-shaped water seal device is prone to freezing and failure in winter, and the water seal liquid level maintenance is frequent, with a biogas dissolution loss rate of 3-8%; third, the electric control system relies on continuous power supply, has poor applicability in rural areas, and the sensor is susceptible to H2S corrosion and failure; fourth, there is a structural compatibility issue: existing devices are mostly designed for steel biogas tanks, which do not match the deformation characteristics of the flexible black film material.

[0004] Based on the many problems existing in the above-mentioned black film biogas tank pressure stabilizing device, it is urgent to develop a new gas pressure stabilizing device for the black film biogas tank. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the present invention provides a gas pressure stabilizing device for a black film biogas tank, which can realize dynamic adjustment of the gas pressure in the black film biogas tank and solve the problem of unstable gas pressure in the black film biogas tank.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A gas pressure stabilizing device for a black film biogas pool, comprising:

[0007] A pressure stabilizing tank, one end of which is connected to a delivery hose, a first control valve being provided on the delivery hose, and the other end of which is connected to a connecting mechanism for connecting the delivery hose to the black film biogas tank. The pressure stabilizing tank is provided with a pressure stabilizing mechanism for regulating and stabilizing the gas pressure in the black film biogas tank;

[0008] The pressure stabilizing mechanism includes a U-shaped tube and an outer piston barrel and an inner piston barrel connected thereto, a part of the U-shaped tube being fixedly connected to the interior of the pressure stabilizing tank, the other part of the U-shaped tube extending to the outside of the pressure stabilizing tank and connected to the outer piston barrel, the interior of the outer piston barrel being slidably connected to an outer piston plate, the upper surface of the outer piston plate being fixedly connected to a piston rod, an air inlet and an air outlet being provided inside the piston rod, a balancing air pipe being provided at the other end of the pressure stabilizing tank away from the delivery hose, a through-tube being provided on the balancing air pipe, the through-tube vertically penetrating the balancing air pipe and connected to the balancing air pipe, the piston rod being slidably connected in the through-tube, one end of the U-shaped tube located in the pressure stabilizing tank being connected to the piston barrel, the interior of the inner piston barrel being slidably connected to an inner piston plate;

[0009] A hollow closed structure is formed between the outer piston plate, the U-shaped tube and the inner piston plate and is filled with water;

[0010] When the air pressure in the pressure-stabilizing tank is stable, the air inlet and outlet holes on the piston rod are not connected to the balance air pipe and ventilation is impossible; when the air pressure in the pressure-stabilizing tank needs to be adjusted, as the piston rod moves up and down, the air inlet or outlet holes are connected to the balance air pipe to realize the ventilation function, thereby adjusting the air pressure.

[0011] Preferably, sealing rings are provided at the upper and lower parts of the air inlet and the air outlet, and an upper limit ring and a lower limit ring are fixedly provided on the inner walls of the outer piston barrel and the inner piston barrel.

[0012] Preferably, an emergency exhaust pipe is further provided at one end of the pressure stabilizing tank close to the balancing air pipe, and the emergency exhaust pipe is connected to the balancing air pipe. A second control valve and a third control valve are respectively provided at the end close to the pressure stabilizing tank where the emergency exhaust pipe and the balancing air pipe are connected. The second control valve is used to control the balancing air pipe, and the third control valve is used to control the emergency exhaust pipe. The other end of the emergency exhaust pipe away from the pressure stabilizing tank is connected to an air collecting bag, and an air collecting bag pressure gauge is provided on the air collecting bag.

[0013] Preferably, it also includes a sealing mechanism, which includes a mounting frame, the outer wall of the mounting frame is fixedly connected to the outer wall of the pressure-stabilizing tank, the interior of the mounting frame is slidably connected to a sealing frame, the outer wall of the sealing frame is fixedly connected to a first sealing strip, the outer wall of the first sealing strip is slidably connected to the inner wall of the mounting frame, and the interior of the sealing frame is provided with a first filter screen and a second filter screen.

[0014] Preferably, the outer wall of the installation frame is fixedly connected to a connecting frame, the interior of the connecting frame is rotatably connected to a sealing cover, the lower surface of the sealing cover is fixedly connected to a second sealing strip, and the lower surface of the second sealing strip is slidably connected to the upper surface of the installation frame.

[0015] Preferably, the outer wall of the sealing cover is fixedly connected to a first connecting plate, the inner thread of the first connecting plate is connected to a threaded rod, the outer wall of the threaded rod is threadedly connected to a second connecting plate, and the outer wall of the second connecting plate is fixedly connected to the outer wall of the mounting frame.

[0016] Preferably, the connecting mechanism includes an external flange, the interior of the external flange is fixedly connected to one end of the conveying hose, the interior of the external flange is threadedly connected to a fixing bolt, the outer wall of the fixing bolt is threadedly connected to the internal flange, the outer wall of the external flange is provided with an external gasket, the outer wall of the external gasket is provided with a perforated HDPE film, the outer wall of the perforated HDPE film is provided with an internal gasket, and the outer wall of the internal gasket is provided and connected to the internal flange.

[0017] Preferably, a shielding mechanism is further included, which includes a protective box, the outer wall of the protective box is fixedly connected to a plug rod, the outer wall of the plug rod is slidably connected to a limiting block, the outer wall of the limiting block is fixedly connected to the outer wall of the pressure-stabilizing tank, the inner part of the protective box is slidably connected to the limiting rod, the outer wall of the limiting rod is fixedly connected to a baffle, the outer wall of the baffle is slidably connected to the inner wall of the protective box, and the protective box and the inner part of the baffle are slidably connected with a balancing air pipe.

[0018] Preferably, the pressure stabilizing tank is provided with an external pressure gauge and an internal pressure gauge, the external pressure gauge is provided on the pressure stabilizing tank between the sealing mechanism and the delivery hose, and the internal pressure gauge is provided on the pressure stabilizing tank between the sealing mechanism and the emergency exhaust pipe.

[0019] Preferably, the U-shaped tube is located inside the pressure-stabilizing tank and is wrapped with inner thermal insulation cotton on its tube wall, the outer wall of the inner thermal insulation cotton is fixedly connected to a second support frame, the outer wall of the second support frame is fixedly connected to the inner wall of the pressure-stabilizing tank, the outer wall of the inner piston barrel is fixedly connected to a second piston bracket, the outer wall of the second piston bracket is fixedly connected to the inner wall of the pressure-stabilizing tank, the U-shaped tube extends to the outside of the pressure-stabilizing tank and is wrapped with outer thermal insulation cotton on its tube wall, the outer wall of the outer thermal insulation cotton is fixedly connected to a first support frame, the outer wall of the first support frame is fixedly connected to the outer wall of the pressure-stabilizing tank, the outer wall of the outer piston barrel is fixedly connected to the first piston bracket, and the outer wall of the first piston bracket is fixedly connected to the outer wall of the pressure-stabilizing tank.

[0020] Preferably, an external drain pipe is provided at the bottom of the pressure stabilizing tank and between the sealing mechanism and the delivery hose, and an internal drain pipe is provided at the bottom of the pressure stabilizing tank and between the sealing mechanism and the emergency exhaust pipe. The outlet of the internal drain pipe is connected to the external drain pipe, and the outlet of the external drain pipe is provided with a fourth control valve.

[0021] The present invention provides a gas pressure stabilizing device for a black film biogas tank. It has the following beneficial effects:

[0022] 1. The present invention changes the internal pressure of the pressure-stabilizing tank, and the outer piston plate and the inner piston plate move up and down with the pressure change, so that the piston rod slides up and down inside the through-tube. Since the through-tube is connected to the balance air pipe, when the air outlet is aligned with the hollow position of the balance air pipe, biogas can be discharged to reduce the internal pressure of the pressure-stabilizing tank. When the air inlet is aligned with the hollow position of the balance air pipe, biogas can be input into the pressure-stabilizing tank to increase the internal pressure of the pressure-stabilizing tank, thereby achieving the effect of dynamically adjusting the internal pressure of the pressure-stabilizing tank. The pressure-stabilizing tank is connected to the black film biogas tank, and the air pressure of the black film biogas tank is regulated by regulating the air pressure in the pressure-stabilizing tank. Moreover, the pressure-stabilizing mechanism is automatically adjustable, and the inner and outer piston plates can move up and down sensitively with the change of air pressure, thereby realizing the up and down movement of the piston rod. The air pressure is automatically and dynamically adjusted by whether the air outlet and air inlet are connected to the balance air pipe, which is efficient and stable.

[0023] 2. The present invention rotates the threaded rod inside the first connecting plate and the second connecting plate to remove the threaded rod from the second connecting plate, and pulls the sealing cover to drive the second sealing strip to rotate on the connecting frame. By pulling the sealing frame, the first filter screen and the second filter screen are driven to move, and the first sealing strip is caused to slide on the inner wall of the installation frame, thereby achieving the effect of cleaning and replacing the first filter screen and the second filter screen.

[0024] 3. The present invention drives the insertion rod to move by pushing the protective box, so that the insertion rod is inserted into the interior of the limit block, thereby fixing the protective box on the pressure-stabilizing tank, and then pushing the baffle to drive the limit rod to move, so that the limit rod slides in the protective box, and then installing the baffle on the protective box. The protective box and the baffle are installed above the outer piston barrel to shield the opening above the outer piston barrel to prevent dust and foreign matter from falling into and affecting the movement of the outer piston plate, thereby protecting the outer piston barrel. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A perspective view of the present invention;

[0026] Figure 2 is a side view of the present invention;

[0027] Figure 3 It is a cross-sectional view of the pressure stabilizing tank of the present invention;

[0028] Figure 4 A cross-sectional view of the balanced trachea of ​​the present invention;

[0029] Figure 5 is a cross-sectional view of the pressure stabilizing mechanism of the present invention;

[0030] Figure 6 is a cross-sectional view of the sealing mechanism of the present invention;

[0031] Figure 7 This is an exploded view of the sealing mechanism of the present invention;

[0032] Figure 8 This is an exploded view of the connection mechanism of the present invention;

[0033] Figure 9 This is an exploded view of the shielding mechanism of the present invention;

[0034] Figure 10 This is a cross-sectional view of the piston rod in the equilibrium position.

[0035] Among them, 1. fixing frame; 2. pressure-surge tank; 3. delivery hose; 4. connecting mechanism; 401. external flange; 402. fixing bolt; 403. external gasket; 404. internal flange; 405. internal gasket; 406. perforated HDPE membrane; 5. first control valve; 6. external pressure gauge; 7. sealing mechanism; 701. sealing frame; 702. first sealing strip; 703. first filter; 704. second filter; 705. sealing cover; 706. second sealing strip; 707. mounting frame; 708. connecting frame; 709. threaded rod; 7010. first connecting plate; 7011. second connecting plate; 8. internal pressure gauge; 9. emergency exhaust pipe; 10. air bag pressure gauge; 11. shielding mechanism; 1101. protective box; 1102. plug rod; 1103. Limit block; 1104. Baffle; 1105. Limit rod; 12. Balance air pipe; 1201. Through-tube; 13. Second control valve; 14. Third control valve; 15. Pressure stabilizing mechanism; 1501. Outer piston barrel; 1502. Piston rod; 1503. Air inlet; 1504. Air outlet; 1505. Sealing ring; 1506. Inner piston barrel; 1507. Upper limit ring; 1508. Outer piston plate; 1509. Lower limit ring; 1510. Inner piston plate; 1511. U-shaped pipe; 16. Outer drain pipe; 17. Inner drain pipe; 18. Fourth control valve; 19. First piston bracket; 20. First support bracket; 21. Second support bracket; 22. Second piston bracket; 23. Inner thermal insulation cotton; 24. Outer thermal insulation cotton; 25. Air collecting bag. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the present specification. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] Please see the attached Figure 1 -Attached Figure 10 The embodiment of the present invention provides a gas pressure stabilizing device for a black film biogas tank, comprising:

[0038] A pressure stabilizing tank 2 is mounted on the ground via a fixing bracket 1. One end of the pressure stabilizing tank 2 is connected to a delivery hose 3, on which a first control valve 5 is provided. The other end of the delivery hose 3 is connected to a connecting mechanism 4, which is used to connect the delivery hose 3 to the black film biogas tank. The pressure stabilizing tank 2 is provided with a pressure stabilizing mechanism 15 for regulating and stabilizing the gas pressure in the black film biogas tank.

[0039] The pressure stabilizing mechanism 15 includes a U-shaped tube 1511 and an outer piston barrel 1501 and an inner piston barrel 1506 connected thereto. A portion of the U-shaped tube 1511 is fixedly connected to the interior of the pressure stabilizing tank 2, and the other portion of the U-shaped tube 1511 extends to the outside of the pressure stabilizing tank 2 and is connected to the outer piston barrel 1501. The interior of the outer piston barrel 1501 is slidably connected to an outer piston plate 1508. The upper surface of the outer piston plate 1508 is fixedly connected to a piston rod 1502. An air inlet 1503 and an air outlet 1504 are provided inside the piston rod 1502. The other end of the pressure stabilizing tank 2 away from the delivery hose 3 is provided with a balancing air pipe 12. A through-tube 1201 is provided on the balancing air pipe 12. The through-tube 1201 vertically penetrates the balancing air pipe 12 and is connected to the balancing air pipe 12. The piston rod 1502 slides Connected to the through-tube 1201, one end of the U-shaped tube 1511 located in the pressure-stabilizing tank 2 is connected to the inner piston barrel 1506, and the inner piston barrel 1506 is slidably connected to the inner piston plate 1510. A hollow and closed structure is formed between the outer piston plate 1508, the U-shaped tube 1511 and the inner piston plate 1510 and is filled with water; when the air pressure in the pressure-stabilizing tank 2 is stable (balanced), the position between the air inlet 1503 and the air outlet 1504 on the piston rod 1502 is aligned with the balance air pipe 12, and the middle is a solid rod, which blocks the balance air pipe 12 and prevents ventilation; when the air pressure in the pressure-stabilizing tank 2 needs to be adjusted, as the piston rod 1502 moves up and down, the air inlet 1503 or the air outlet 1504 is connected to the balance air pipe 12 to realize the ventilation function, thereby adjusting the air pressure.

[0040] Sealing rings 1505 are provided at the upper and lower parts of the air inlet 1503 and the air outlet 1504 , and an upper limit ring 1507 and a lower limit ring 1509 are fixedly provided on the inner walls of the outer piston barrel 1501 and the inner piston barrel 1506 .

[0041] An emergency exhaust pipe 9 is also provided at one end of the pressure stabilizing tank 2 near the balancing air pipe 12, and the emergency exhaust pipe 9 is connected to the balancing air pipe 12. A second control valve 13 and a third control valve 14 are respectively provided at the end near the pressure stabilizing tank 2 where the emergency exhaust pipe 9 and the balancing air pipe 12 are connected. The second control valve 13 is used to control the balancing air pipe 12, and the third control valve 14 is used to control the emergency exhaust pipe 9. The other end of the emergency exhaust pipe 9 away from the pressure stabilizing tank 2 is connected to an air collecting bag 25, and the air collecting bag 25 is provided with an air collecting bag pressure gauge 10.

[0042] Specifically, since the black film biogas tank is connected to the pressure-surge tank 2 through the delivery hose 3, the air pressure in the pressure-surge tank 2 is consistent with that in the black film biogas tank. When the internal pressure of the black film biogas tank increases, the internal pressure of the pressure-surge tank 2 will also rise accordingly, and the inner piston plate 1510 is pushed downward by the pressure to slide in the inner piston barrel 1506. The downward movement of the inner piston plate 1510 squeezes the water in the U-tube 1511, causing the water in the U-tube 1511 to flow toward the outer piston barrel 1501, and further squeezes and pushes the outer piston plate 1508 to move upward, and pushes the piston rod 1502 to move upward, causing the piston rod 1502 to slide upward in the through-tube 1201. Since the through-tube 1201 vertically penetrates the balancing air pipe 12 and is connected to the balancing air pipe 12, the upward sliding of the piston rod 1502 can align the air outlet 1504 with the balancing air pipe 1 2. The hollow position in the tube allows the biogas inside the pressure-stabilizing tank 2 to enter the balancing air pipe 12 through the air outlet 1504 and enter the air collecting bag 25 through the second control valve 13, and store the biogas in the air collecting bag 25. The discharge of biogas achieves the effect of reducing the internal pressure of the pressure-stabilizing tank 2 and the black film biogas pool. At the same time, as the biogas is discharged and the air pressure in the pressure-stabilizing tank 2 decreases, the squeezing of the piston rod 1502 by the water in the U-tube 1511 will gradually decrease, and the piston rod 1502 will slowly move downward. When the pressure is balanced, the piston rod 1502 moves downward without communicating with the balancing air pipe 12 (when balanced, the piston rod 1502 is aligned with the balancing air pipe 12 at the middle position between the air outlet 1504 and the air inlet 1503, and the middle is a solid rod, which has a blocking function for the balancing air pipe 12), thereby ending the exhaust and achieving a stable pressure state. When the internal pressure of the black film biogas pool decreases, the internal pressure of the pressure-surge tank 2 will also decrease accordingly. The external atmospheric pressure causes the outer piston plate 1508 to slide downward in the outer piston barrel 1501, and causes the water in the U-shaped tube 1511 to push the inner piston plate 1510 to slide upward in the inner piston barrel 1506. The downward movement of the outer piston plate 1508 drives the piston rod 1502 to slide downward in the through-tube 1201, so that the air inlet 1503 is aligned with the hollow position in the balance air pipe 12, and then the biogas in the air collecting bag 25 enters the interior of the pressure-surge tank 2 through the balance air pipe 12, and is further transported to the black film biogas pool. The entry of biogas increases the internal pressure of the pressure-surge tank 2 and the black film biogas pool, thereby achieving the effect of stabilizing the internal pressure of the pressure-surge tank 2 and the black film biogas pool.

[0043] The upper limit ring 1507 and the lower limit ring 1509 in the outer piston barrel 1501 and the inner piston barrel 1506 are provided to limit the movement of the outer piston plate 1508 and the inner piston plate 1510, and the sealing ring 1505 above and below the air inlet 1503 and the air outlet 1504 is used to seal and prevent biogas leakage. When the pressure of the black film biogas tank and the pressure regulating tank 2 is stable, the piston rod 1502 is aligned with the balance air pipe 12 (at the middle position between the air outlet 1504 and the air inlet 1503). Figure 10 ), the middle is a solid rod, which blocks the balance air pipe 12. At this time, the air inlet 1503 and the air outlet 1504 on the piston rod 1502 are not connected to the balance air pipe 12, and the presence of the sealing ring 1505 further ensures that the biogas in the surge tank 2 will not leak;

[0044] The sealing mechanism 7 is installed inside the pressure-surge tank 2 and is used to replace and clean the filter screen. The sealing mechanism 7 includes a mounting frame 707, the outer wall of the mounting frame 707 is fixedly connected to the outer wall of the pressure-surge tank 2, the interior of the mounting frame 707 is slidably connected to a sealing frame 701, the outer wall of the sealing frame 701 is fixedly connected to a first sealing strip 702, the outer wall of the first sealing strip 702 is slidably connected to the inner wall of the mounting frame 707, and the interior of the sealing frame 701 is provided with a first filter screen 703 and a second filter screen 704; the outer wall of the mounting frame 707 is fixedly connected to Connecting frame 708, the internal rotatable connection of sealing cover 705, the lower surface of sealing cover 705 is fixedly connected to the second sealing strip 706, the lower surface of second sealing strip 706 is slidably connected to the upper surface of mounting frame 707; the outer wall of sealing cover 705 is fixedly connected to the first connecting plate 7010, the internal thread connection of first connecting plate 7010 is threadedly connected to threaded rod 709, the outer wall of threaded rod 709 is threadedly connected to the second connecting plate 7011, the outer wall of second connecting plate 7011 is fixedly connected to the outer wall of mounting frame 707;

[0045] Specifically, the biogas entering the surge tank 2 is filtered by the first filter 703 and the second filter 704, and the moisture in the biogas is condensed on the first filter 703 and the second filter 704 and falls to the bottom of the surge tank 2 and is finally discharged. The threaded rod 709 is rotated in the first connecting plate 7010 and the second connecting plate 7011 to remove the threaded rod 709 from the second connecting plate 7011, and the sealing cover 705 is pulled to drive the second sealing strip 706 to rotate on the connecting frame 708, thereby opening the installation frame 707, and the first filter 703 and the second filter 704 are moved by pulling the sealing frame 701, and the first sealing strip 702 is made to slide on the inner wall of the installation frame 707, thereby removing the first filter 703 and the second filter 704, thereby achieving the effect of cleaning and replacing the first filter 703 and the second filter 704;

[0046] It is fixed in the sealing frame 701 by the first sealing strip 702, and the connection between the sealing frame 701 and the mounting frame 707 is sealed by the first sealing strip 702. The second sealing strip 706 contacts the mounting frame 707, thereby sealing the connection. The first filter screen 703 is an 80-mesh filter screen, made of 316 stainless steel, and coated with polytetrafluoroethylene. The second filter screen 704 is a 100-mesh filter screen, made of 316 stainless steel, and coated with polytetrafluoroethylene.

[0047] A connecting mechanism 4 is installed at one end of the delivery hose 3 and is used to be fixed on the black film biogas to achieve communication between the black film biogas tank and the pressure regulating tank 2; the connecting mechanism 4 includes an external flange 401, the interior of the external flange 401 is fixedly connected to one end of the delivery hose 3, the internal thread of the external flange 401 is connected to a fixing bolt 402, the outer wall of the fixing bolt 402 is threadedly connected to an internal flange 404, the outer wall of the external flange 401 is provided with an external gasket 403, the outer wall of the external gasket 403 is provided with a perforated HDPE film 406, the outer wall of the perforated HDPE film 406 is provided with an internal gasket 405, and the outer wall of the internal gasket 405 is provided and connected to the internal flange 404;

[0048] Specifically, by pushing the inner flange 404 and the inner gasket 405 to move and contact with the outer gasket 403 and comparing the black film opening position, the outer flange 401 and the outer gasket 403 are pushed to open the outer gasket 403, and then by rotating the fixing bolt 402 inside the outer flange 401 and the inner flange 404, the inner flange 404 is fixed to the outer flange 401 through the thread, thereby connecting the delivery hose 3 with the black film biogas tank, allowing the biogas to enter the interior of the pressure regulating tank 2 through the delivery hose 3 and the first control valve 5. The connection mechanism 4 has good compatibility, can achieve a good connection with the black film flexible material, and has good sealing performance, which can prevent biogas leakage.

[0049] The shielding mechanism 11 is mounted on the outer wall of the delivery hose 3 and is used to protect the pressure stabilizing mechanism 15. The shielding mechanism 11 includes a protective box 1101. The outer wall of the protective box 1101 is fixedly connected to the insertion rod 1102. The outer wall of the insertion rod 1102 is slidably connected to the limit block 1103. The outer wall of the limit block 1103 is fixedly connected to the outer wall of the pressure stabilizing tank 2. The inner part of the protective box 1101 is slidably connected to the limit rod 1105. The outer wall of the limit rod 1105 is fixedly connected to the baffle 1104. The outer wall of the baffle 1104 is slidably connected to the inner wall of the protective box 1101. The inner parts of the protective box 1101 and the baffle 1104 are slidably connected to the balance air pipe 12.

[0050] Specifically, the protective box 1101 is pushed to drive the insertion rod 1102 to move, so that the insertion rod 1102 is inserted into the interior of the limit block 1103, thereby fixing the protective box 1101 on the pressure-stabilizing tank 2, and then pushing the baffle 1104 to drive the limit rod 1105 to move, so that the limit rod 1105 slides in the protective box 1101, and then the baffle 1104 is installed on the protective box 1101, and the protective box 1101 and the baffle 1104 are installed above the outer piston barrel 1501, and the opening above the outer piston barrel 1501 is shielded to prevent dust and foreign matter from falling into and affecting the movement of the outer piston plate 1508, thereby protecting the outer piston barrel 1501.

[0051] The pressure stabilizing tank 2 is provided with an external pressure gauge 6 and an internal pressure gauge 8. The external pressure gauge 6 is provided on the pressure stabilizing tank 2 between the sealing mechanism 7 and the delivery hose 3, and the internal pressure gauge 8 is provided on the pressure stabilizing tank 2 between the sealing mechanism 7 and the emergency exhaust pipe 9.

[0052] Specifically, the pressure between the delivery hose 3 and the first filter 703 is monitored by the external pressure gauge 6, the pressure between the second filter 704 and the emergency exhaust pipe 9 is monitored by the internal pressure gauge 8, and the pressure inside the air collecting bag 25 is monitored by the air collecting bag pressure gauge 10. When the monitoring value of the external pressure gauge 6 is greater than the monitoring value of the internal pressure gauge 8, and the pressure difference exceeds 2kPa, it indicates that the filter is clogged and the first filter 703 and the second filter 704 need to be disassembled, cleaned or replaced; when the internal pressure gauge 8 shows that the air pressure is too high (greater than 8kPa), it means that the pressure in the surge tank 2 is too high. At this time, it is necessary to open the third control valve 14, close the second control valve 13 and the first control valve 5, and discharge the biogas into the gas collecting bag 25 through the emergency exhaust pipe 9, and further send the excess gas to the biogas power generation or biogas combustion equipment to reduce the internal pressure of the surge tank 2 to below 8kPa (displayed by the internal pressure gauge 8); when the gas collecting bag pressure gauge 10 shows that the pressure is too high (greater than 8kPa), close the third control valve 14, the second control valve 13 and the first control valve 5, open the exhaust valve of the gas collecting bag 25, and send the excess gas to the biogas power generation or biogas combustion equipment to avoid direct discharge causing energy waste and environmental pollution.

[0053] The U-shaped tube 1511 is located on the tube wall inside the pressure-stabilizing tank 2 and is wrapped with inner thermal insulation cotton 23. The outer wall of the inner thermal insulation cotton 23 is fixedly connected to the second support frame 21. The outer wall of the second support frame 21 is fixedly connected to the inner wall of the pressure-stabilizing tank 2. The outer wall of the inner piston barrel 1506 is fixedly connected to the second piston bracket 22. The outer wall of the second piston bracket 22 is fixedly connected to the inner wall of the pressure-stabilizing tank 2. The U-shaped tube 1511 extends to the tube wall outside the pressure-stabilizing tank 2 and is wrapped with outer thermal insulation cotton 24. The outer wall of the outer thermal insulation cotton 24 is fixedly connected to the first support frame 20. The outer wall of the first support frame 20 is fixedly connected to the outer wall of the pressure-stabilizing tank 2. The outer wall of the outer piston barrel 1501 is fixedly connected to the first piston bracket 19. The outer wall of the first piston bracket 19 is fixedly connected to the outer wall of the pressure-stabilizing tank 2.

[0054] Specifically, the outer piston barrel 1501 and the inner piston barrel 1506 are supported and fixed respectively by the first piston bracket 19 and the second piston bracket 22. The portion of the U-shaped tube 1511 inside the pressure-surge tank 2 is insulated by the inner insulation cotton 23 and fixed to the inner wall of the pressure-surge tank 2 by multiple second support brackets 21. The portion of the U-shaped tube 1511 outside the pressure-surge tank 2 is insulated by the outer insulation cotton 24 and fixed to the outer wall of the pressure-surge tank 2 by multiple first support brackets 20. The inner insulation cotton 23 and the outer insulation cotton 24 prevent the water in the U-shaped tube 1511 from freezing in low temperatures, which would affect its use.

[0055] An external drain pipe 16 is provided at the bottom of the surge tank 2 between the sealing mechanism 7 and the delivery hose 3. An internal drain pipe 17 is provided at the bottom of the surge tank 2 between the sealing mechanism 7 and the emergency exhaust pipe 9. The outlet of the internal drain pipe 17 is connected to the external drain pipe 16. A fourth control valve 18 is provided at the outlet of the external drain pipe 16.

[0056] Specifically, the water inside the first filter screen 703 inside the pressure stabilizing tank 2 is collected through the external drainage pipe 16, and the water inside the second filter screen 704 inside the pressure stabilizing tank 2 is collected through the internal drainage pipe 17. The internal water can be discharged by opening the fourth control valve 18.

[0057] Working principle: First, push the internal flange 404 and the internal gasket 405 to move and contact with the external gasket 403 and compare with the position of the black film opening in the black film biogas tank, then push the external flange 401 and the external gasket 403 to move the opening of the external gasket 403, and then rotate the fixing bolt 402 inside the external flange 401 and the internal flange 404, and fix the internal flange 404 on the external flange 401 through the thread, so that the delivery hose 3 is connected with the black film biogas tank, open the first control valve 5, and allow the biogas to enter the interior of the pressure-regulating tank 2 through the delivery hose 3, and realize the air pressure communication between the black film biogas tank and the pressure-regulating tank 2 through the delivery hose 3;

[0058] The biogas entering the pressure-surge tank 2 is filtered by the first filter screen 703 and the second filter screen 704, and the moisture in the biogas is condensed on the first filter screen 703 and the second filter screen 704 and falls into the bottom of the pressure-surge tank 2 and is discharged. The threaded rod 709 is rotated in the first connecting plate 7010 and the second connecting plate 7011 to be taken out from the second connecting plate 7011, and the sealing cover 705 is pulled to drive the second sealing strip 706 to rotate on the connecting frame 708, thereby opening the installation frame 707, and the first filter screen 703 and the second filter screen 704 are moved by pulling the sealing frame 701, and the first sealing strip 702 is made to slide on the inner wall of the installation frame 707, thereby taking out the first filter screen 703 and the second filter screen 704, thereby achieving the effect of cleaning and replacing the first filter screen 703 and the second filter screen 704;

[0059] Open the first control valve 5 and the second control valve 13, and close the third control valve 14. When the internal pressure of the pressure-surge tank 2 rises, the inner piston plate 1510 is pushed downward by the pressure to slide in the inner piston barrel 1506. The downward movement of the inner piston plate 1510 squeezes the water in the U-tube 1511, causing the water to flow from the U-tube 1511 to the outer piston barrel 1504, and pushes the outer piston plate 1508 to move upward, further pushing the piston rod 1502 to move upward, and the piston rod 1502 slides upward inside the through-tube 1201. Since the through-tube 1201 vertically penetrates the balancing air pipe 12 and is connected to the balancing air pipe 12, the upward sliding of the piston rod 1502 can align the air outlet 1504 with the hollow position in the balancing air pipe 12, so that the biogas inside the pressure-surge tank 2 enters the balancing air pipe 12 through the air outlet 1504 and enters the collecting The air bag 25 is used to store biogas, and the discharge of biogas can reduce the internal pressure of the pressure-surge tank 2 and the black film biogas pool. When the external pressure is greater than the internal pressure of the pressure-surge tank 2, the external atmospheric pressure causes the outer piston plate 1508 to slide downward in the outer piston barrel 1501, and causes the water in the U-shaped tube 1511 to push the inner piston plate 1510 to slide upward in the inner piston barrel 1506. The downward movement of the outer piston plate 1508 drives the piston rod 1502 to slide downward in the through tube 1201, and aligns the air inlet 1503 with the hollow position in the balancing air pipe 12, so that the biogas in the air collecting bag 25 enters the interior of the pressure-surge tank 2 and the black film biogas pool through the balancing air pipe 12. The internal pressure of the pressure-surge tank 2 and the black film biogas pool is increased by the entry of biogas, thereby achieving the effect of stabilizing the internal pressure of the pressure-surge tank 2 and the black film biogas pool.

[0060] At the same time, the pressure between the conveying hose 3 and the first filter 703 is detected by the external pressure gauge 6, the pressure between the second filter 704 and the emergency exhaust pipe 9 is detected by the internal pressure gauge 8, and the pressure inside the air collecting bag 25 is monitored by the air collecting bag pressure gauge 10. When the monitoring value of the external pressure gauge 6 is greater than the monitoring value of the internal pressure gauge 8, and the pressure difference exceeds 2kPa, it indicates that the filter is clogged and the first filter 703 and the second filter 704 need to be disassembled, cleaned or replaced; when the internal pressure gauge 8 shows that the air pressure is too high (greater than 8kPa), it means that the pressure in the surge tank 2 is too high. At this time, it is necessary to open the third control valve 14, close the second control valve 13 and the first control valve 5, and discharge the biogas into the gas collecting bag 25 through the emergency exhaust pipe 9, and further send the excess gas to the biogas power generation or biogas combustion equipment to reduce the internal pressure of the surge tank 2 to below 8kPa (displayed by the internal pressure gauge 8); when the gas collecting bag pressure gauge 10 shows that the pressure is too high (greater than 8kPa), close the third control valve 14, the second control valve 13 and the first control valve 5, open the exhaust valve of the gas collecting bag 25, and send the excess gas to the biogas power generation or biogas combustion equipment;

[0061] The water inside the first filter screen 703 inside the pressure stabilizing tank 2 is collected through the external drainage pipe 16, and the water inside the second filter screen 704 inside the pressure stabilizing tank 2 is collected through the internal drainage pipe 17. The internal water can be discharged by opening the fourth control valve 18.

[0062] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A gas pressure stabilizing device for a black film biogas tank, characterized in that: include: A pressure stabilizing tank (2), one end of the pressure stabilizing tank (2) is connected to a delivery hose (3), a first control valve (5) is provided on the delivery hose (3), the other end of the delivery hose (3) is connected to a connecting mechanism (4), the connecting mechanism (4) is used to connect the delivery hose (3) with the black film biogas tank, and the pressure stabilizing tank (2) is provided with a pressure stabilizing mechanism (15) for regulating and stabilizing the gas pressure in the black film biogas tank; The pressure stabilizing mechanism (15) comprises a U-shaped tube (1511) and an outer piston barrel (1501) and an inner piston barrel (1506) connected thereto. A portion of the U-shaped tube (1511) is fixedly connected to the interior of the pressure stabilizing tank (2), and another portion of the U-shaped tube (1511) extends to the exterior of the pressure stabilizing tank (2) and is connected to the outer piston barrel (1501). An outer piston plate (1508) is slidably connected to the interior of the outer piston barrel (1501). A piston rod (1502) is fixedly connected to the upper surface of the outer piston plate (1508). An air inlet (1503) and an air outlet (1504) are provided inside the piston rod (1502). The pressure stabilizing tank (2) is remote from the outer piston plate (1508). A balancing air pipe (12) is provided at the other end of the delivery hose (3), and a through-tube (1201) is provided on the balancing air pipe (12), and the through-tube (1201) vertically penetrates the balancing air pipe (12) and is communicated with the balancing air pipe (12), and the piston rod (1502) is slidably connected to the through-tube (1201), and one end of the U-shaped tube (1511) located in the pressure-stabilizing tank (2) is communicated with the inner piston barrel (1506), and the interior of the inner piston barrel (1506) is slidably connected to the inner piston plate (1510), and a hollow closed structure is formed between the outer piston plate (1508), the U-shaped tube (1511) and the inner piston plate (1510) and is filled with water.

2. The gas pressure stabilizing device for a black film biogas tank according to claim 1, characterized in that: The upper and lower parts of the air inlet (1503) and the air outlet (1504) are both provided with sealing rings (1505), and the inner walls of the outer piston barrel (1501) and the inner piston barrel (1506) are fixedly provided with an upper limit ring (1507) and a lower limit ring (1509).

3. The gas pressure stabilizing device for a black film biogas tank according to claim 1, characterized in that: An emergency exhaust pipe (9) is further provided at one end of the pressure stabilizing tank (2) close to the balancing air pipe (12), and the emergency exhaust pipe (9) is connected to the balancing air pipe (12). A second control valve (13) and a third control valve (14) are respectively provided at one end of the pressure stabilizing tank (2) where the emergency exhaust pipe (9) and the balancing air pipe (12) are connected. The second control valve (13) is used to control the balancing air pipe (12), and the third control valve (14) is used to control the emergency exhaust pipe (9). The other end of the emergency exhaust pipe (9) away from the pressure stabilizing tank (2) is connected to an air collecting bag (25), and an air collecting bag pressure gauge (10) is provided on the air collecting bag (25).

4. The gas pressure stabilizing device for a black film biogas tank according to claim 1, characterized in that: The invention also includes a sealing mechanism (7), wherein the sealing mechanism (7) includes a mounting frame (707), the outer wall of the mounting frame (707) is fixedly connected to the outer wall of the pressure-sustaining tank (2), the interior of the mounting frame (707) is slidably connected to a sealing frame (701), the outer wall of the sealing frame (701) is fixedly connected to a first sealing strip (702), the outer wall of the first sealing strip (702) is slidably connected to the inner wall of the mounting frame (707), and the interior of the sealing frame (701) is provided with a first filter screen (703) and a second filter screen (704).

5. The gas pressure stabilizing device for a black film biogas tank according to claim 4, characterized in that: The outer wall of the installation frame (707) is fixedly connected to a connecting frame (708), the interior of the connecting frame (708) is rotatably connected to a sealing cover (705), the lower surface of the sealing cover (705) is fixedly connected to a second sealing strip (706), the lower surface of the second sealing strip (706) is slidably connected to the upper surface of the installation frame (707), the outer wall of the sealing cover (705) is fixedly connected to a first connecting plate (7010), the interior of the first connecting plate (7010) is threadedly connected to a threaded rod (709), the outer wall of the threaded rod (709) is threadedly connected to a second connecting plate (7011), and the outer wall of the second connecting plate (7011) is fixedly connected to the outer wall of the installation frame (707).

6. The gas pressure stabilizing device for a black film biogas tank according to claim 1, characterized in that: The connecting mechanism (4) comprises an external flange (401), the interior of the external flange (401) is fixedly connected to one end of the conveying hose (3), the interior of the external flange (401) is threadedly connected to a fixing bolt (402), the outer wall of the fixing bolt (402) is threadedly connected to an internal flange (404), the outer wall of the external flange (401) is provided with an external gasket (403), the outer wall of the external gasket (403) is provided with a perforated HDPE film (406), the outer wall of the perforated HDPE film (406) is provided with an internal gasket (405), and the outer wall of the internal gasket (405) is provided and connected to the internal flange (404).

7. The gas pressure stabilizing device for a black film biogas tank according to claim 1, characterized in that: The invention also includes a shielding mechanism (11), wherein the shielding mechanism (11) includes a protective box (1101), the outer wall of the protective box (1101) is fixedly connected to a plug rod (1102), the outer wall of the plug rod (1102) is slidably connected to a limit block (1103), the outer wall of the limit block (1103) is fixedly connected to the outer wall of the pressure-sustaining tank (2), the interior of the protective box (1101) is slidably connected to a limit rod (1105), the outer wall of the limit rod (1105) is fixedly connected to a baffle (1104), the outer wall of the baffle (1104) is slidably connected to the inner wall of the protective box (1101), and the interior of the protective box (1101) and the baffle (1104) are slidably connected to a balance air pipe (12).

8. The gas pressure stabilizing device for a black film biogas tank according to claim 4, characterized in that: The pressure stabilizing tank (2) is provided with an external pressure gauge (6) and an internal pressure gauge (8). The external pressure gauge (6) is provided on the pressure stabilizing tank (2) between the sealing mechanism (7) and the delivery hose (3), and the internal pressure gauge (8) is provided on the pressure stabilizing tank (2) between the sealing mechanism (7) and the emergency exhaust pipe (9).

9. The gas pressure stabilizing device for a black film biogas tank according to claim 1, characterized in that: The U-shaped tube (1511) is located on the tube wall inside the pressure-stabilizing tank (2) and is wrapped with inner thermal insulation cotton (23). The outer wall of the inner thermal insulation cotton (23) is fixedly connected to the second support frame (21). The outer wall of the second support frame (21) is fixedly connected to the inner wall of the pressure-stabilizing tank (2). The outer wall of the inner piston barrel (1506) is fixedly connected to the second piston bracket (22). The outer wall of the second piston bracket (22) is fixedly connected to the inner wall of the pressure-stabilizing tank (2). The U-shaped tube (1511) is extended to the tube wall outside the pressure-stabilizing tank (2) and is wrapped with outer thermal insulation cotton (24). The outer wall of the outer thermal insulation cotton (24) is fixedly connected to the first support frame (20). The outer wall of the first support frame (20) is fixedly connected to the outer wall of the pressure-stabilizing tank (2). The outer wall of the outer piston barrel (1501) is fixedly connected to the first piston bracket (19). The outer wall of the first piston bracket (19) is fixedly connected to the outer wall of the pressure-stabilizing tank (2).

10. The gas pressure stabilizing device for a black film biogas tank according to claim 4, characterized in that: An external drain pipe (16) is provided at the bottom of the pressure stabilizing tank (2) and between the sealing mechanism (7) and the delivery hose (3); an internal drain pipe (17) is provided at the bottom of the pressure stabilizing tank (2) and between the sealing mechanism (7) and the emergency exhaust pipe (9); the outlet of the internal drain pipe (17) is communicated with the external drain pipe (16); and a fourth control valve (18) is provided at the outlet of the external drain pipe (16).

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