Switching mechanism of a Roots pump capable of switching between dry and sewage channels

Abstract

The present invention relates to the technical field of pump equipment, and specifically to a switching mechanism for a Roots pump that can switch between a dry type and a sewage passage, which is used for a Roots pump that can switch between a dry type and a sewage passage. The Roots pump includes a pump body and connecting pipes arranged on both sides of the pump body. A sealing cover plate is movably installed on one side of the pump body, and a mounting screw is fixedly installed on the side of the pump body where the sealing cover plate is installed. The air pressure inside the structure composed of the pump body and the sealing cover plate is discharged. When conveying some compressible materials, by adjusting the air pressure inside the pump body, the density and flow rate of the fluid can be changed. When the air pressure inside the pump body decreases, the volume of the fluid expands and the flow rate may increase, which can increase the flow rate to a certain extent and can flexibly adjust the gas flow rate according to the needs of downstream users. If the load faced by the pump during operation suddenly changes, adjusting the air pressure inside the pump body can quickly adjust the output power of the pump, avoiding damage to the motor or the pump body due to overload, and having stronger adjustability.

Description

Technical Field

[0001] The present invention relates to the technical field of pump equipment, and particularly to a switching mechanism for a Roots pump that can switch between a dry type and a sewage passage. Background Art

[0002] A Roots pump is a positive displacement vacuum pump. The Roots pump mainly consists of two rotors in the shape of "8", which are installed parallel to each other and mesh with each other in the pump body. The shape design of the rotors enables them to continuously push the gas from the intake port to the exhaust port during rotation. There is a very small gap between the rotors and between the rotors and the pump body, usually between 0.1 - 0.5 mm, to ensure tightness while ensuring the smooth rotation of the rotors. The Roots pump has good compatibility with various gases, and can effectively pump both permanent gases (such as nitrogen, oxygen, etc.) and condensable gases (such as water vapor, organic solvent vapor, etc.).

[0003] When the Roots pump is operating, it is in a certain vacuum or pressure state inside. If it cannot be directly depressurized, when the system suddenly needs to stop operating or an emergency occurs, the internal pressure cannot be quickly adjusted. For example, during the sewage suction operation, if a short circuit power failure or equipment failure occurs, the pressure inside the Roots pump cannot be released in time, and it may cause a sudden change in the pressure inside the pump due to external factors (such as temperature changes, the associated influence of subsequent equipment, etc.). This sudden change in pressure may cause the pump body to be subjected to a great stress impact, resulting in damage to the pump body structure, such as a cracked pump shell or deformed rotors. In extreme cases, it may cause leakage or even explosion and other serious safety accidents, threatening the lives and safety of operators. Summary of the Invention

[0004] The purpose of the present invention is to provide a switching mechanism for a Roots pump that can switch between a dry type and a sewage passage, so as to solve the problems raised in the above background art.

[0005] To achieve the above object, the present invention provides the following technical solution: A switching mechanism for a Roots pump capable of switching between a dry type and a sewage channel, which is used for a Roots pump capable of switching between a dry type and a sewage channel. The Roots pump includes a pump body and connecting pipes provided on both sides of the pump body. A sealing cover plate is movably installed on one side of the pump body. An installation screw rod is fixedly installed on the side of the pump body where the sealing cover plate is installed. An installation bolt is threadedly connected to the installation screw rod, and the installation bolt supports at the corresponding position on the outer wall of the sealing cover plate. A circular installation cylinder is provided at the center position on the side of the sealing cover plate away from the pump body. A pressure relief cylinder is fixedly installed on the sealing cover plate corresponding to the position of the circular installation cylinder. A plurality of one-way exhaust valves are provided on the pressure relief cylinder. An electric push rod is fixedly installed on the outer wall of the circular installation cylinder. A circular solid plug located inside the pressure relief cylinder is fixedly installed on the piston rod of the electric push rod. A circular rubber plug is fixedly installed on the side of the circular solid plug away from the circular installation cylinder, and the circular rubber plug is also located inside the pressure relief cylinder. A gas guide pipe is fixedly installed on the circular solid plug and the circular rubber plug in terms of structure. The end of the gas guide pipe passes through the circular solid plug and the circular rubber plug and is located inside the pressure relief cylinder. A sealing plug is movably inserted into the gas guide pipe, and a limit cover is fixedly installed at the end of the sealing plug away from the gas guide pipe.

[0006] Preferably, multiple groups of sealing rings are provided on the outer wall of the sealing plug, and the sealing rings are equidistantly arranged on the sealing plug.

[0007] Preferably, a spherical grip is fixedly installed on the side of the limit cover away from the sealing plug.

[0008] Preferably, the sealing plug, the limit cover, the sealing rings, and the spherical grip are of an integrally formed structure.

[0009] Preferably, the pressure relief cylinder and the circular solid plug and the circular rubber plug form a sealed cavity.

[0010] For a Roots pump capable of switching between a dry type and a sewage channel, a trapezoidal installation sleeve is provided on the side of the connecting pipe away from the pump body. Docking strips are provided on both the connecting pipe and the trapezoidal installation sleeve close to one side, and bolts are provided for fixing between the two docking strips.

[0011] Preferably, an adjustment plate is provided inside the trapezoidal installation sleeve. A fixing rod is fixedly installed on the side of the adjustment plate close to the connecting pipe. A lifting pull rod is movably inserted into the trapezoidal installation sleeve. A first fixing sleeve is fixedly installed on the part of the lifting pull rod located inside the trapezoidal installation sleeve. The first fixing sleeve is movably sleeved on the fixing rod. An annular clamping sleeve is fixedly installed at the other end of the adjustment plate away from the fixing rod. A movable rotating rod is rotatably connected to the trapezoidal installation sleeve. The annular clamping sleeve is movably sleeved on the movable rotating rod. Deformable pressure strips are fixedly installed on both the upper surface and the lower surface of the side of the adjustment plate close to the fixing rod.

[0012] Preferably, second fixing sleeves are fixedly installed at both the top and bottom of the lifting drawbar, and a first connecting rod is arranged between the second fixing sleeves for connection.

[0013] Preferably, a rectangular mounting base is arranged at the top of the connecting pipe. A guiding sliding groove and a positioning clamping groove are formed at the top of the rectangular mounting base. A structure composed of a positioning insertion bar and a second connecting rod is slidably connected in the rectangular mounting base. The positioning insertion bar is movably clamped in the embedded clamping grooves equidistantly arranged on the lifting drawbar. A prefabricated hinge is fixedly installed at the top of the positioning insertion bar. The prefabricated hinge is located in the guiding sliding groove. An angle-adjustable rod is rotatably connected to the prefabricated hinge. A protective sleeve is fixedly installed at one end of the angle-adjustable rod away from the prefabricated hinge. The protective sleeve is movably clamped in the positioning clamping groove.

[0014] Preferably, a movable insertion frame is fixedly installed on one side of the trapezoidal mounting sleeve away from the connecting pipe. A rectangular filter plate is movably inserted into the movable insertion frame. A rounded rectangular groove is formed in the rectangular filter plate. A countersunk bolt threadedly connected to the movable insertion frame is arranged in the rounded rectangular groove. An inclined hook plate is arranged at the bottom of the rectangular filter plate. Sealing and leak-proof bands are arranged at the corresponding positions at the bottom and top of the movable insertion frame.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. When the air pressure in the pump body is too high and needs to be adjusted to ensure the material conveying effect, remove the structure composed of the sealing plug, the limit cover, the sealing ring and the spherical grip on the air guide pipe. The gas in the structure composed of the pressure relief cylinder and the circular rubber plug can be discharged from the air guide pipe. The circular rubber plug and the circular fixed plug move to apply pressure to the pressure relief cylinder, and the pressure is transmitted into the structure composed of the pump body and the sealing cover plate through the one-way exhaust valve, discharging the air pressure in the structure composed of the pump body and the sealing cover plate. When conveying some compressible materials, by adjusting the air pressure in the pump body, the density and flow rate of the fluid can be changed. When the air pressure in the pump body decreases, the volume of the fluid expands and the flow rate may increase, which can improve the flow rate to a certain extent and can flexibly adjust the gas flow rate according to the needs of downstream users. If the load faced by the pump during operation suddenly changes, adjusting the air pressure in the pump body can quickly adjust the output power of the pump to avoid damage to the motor or the pump body due to overload, and has stronger adjustability.

[0017] 2. When dry sundries pass through the structure composed of the movable insertion frame below and the rectangular filter plate, the rectangular filter plate blocks the larger particles in the dry sundries. The blocked particles fall into the groove formed by the rectangular filter plate and the inclined hook plate. When the rectangular filter plate is withdrawn, the sundries on the rectangular filter plate can be cleaned. When the liquid in the sewage channel passes through the movable insertion frame above and the rectangular filter plate, the corresponding rectangular filter plate can also be removed and cleaned. Larger sundries may cause local changes in the flow channel inside the pump after entering the pump body, resulting in fluctuations in the flow rate and pressure of the fluid. Stable flow rate and pressure output are important for the cleaning process, thus ensuring the stability of fluid transportation.

[0018] 3. By applying a tensile force to the protective sleeve, the structure composed of the protective sleeve and the angle-adjustable rod rotates around the assembled hinge. When the structure composed of the angle-adjustable rod and the protective sleeve rotates around the assembled hinge, the lifting pull rod drives the first fixed sleeve to lift when it is pulled up and down, thereby driving the end of the adjustment plate close to the fixed rod to lift. The deformable pressure strip contacts the top and bottom of the inner wall of the trapezoidal installation sleeve. When the fixed rod moves upward, the movable insertion frame and the rectangular filter plate corresponding to the sewage channel are sealed. When the fixed rod moves downward, the movable insertion frame and the rectangular filter plate corresponding to the dry part are sealed. When switching different feeding ends, the pump body can be cleaned and maintained specifically during the gap of feeding switching, thus achieving a better use effect. Through the design of the rapid switching system for the dry and sewage suction channels, the suction mode can be quickly switched, and two working modes of dry materials such as sand and gravel, soil and wet materials such as sewage sludge can be integrated. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front view structural schematic diagram of the present invention.

[0020] Figure 2 It is a side view structural schematic diagram of the present invention.

[0021] Figure 3 It is a top view structural schematic diagram of the present invention.

[0022] Figure 4 It is a structural schematic diagram at the corresponding position of the circular installation cylinder of the present invention.

[0023] Figure 5 It is a structural schematic diagram at the corresponding position of the spherical grip of the present invention.

[0024] Figure 6 It is a structural schematic diagram at the corresponding position of the pressure relief cylinder of the present invention.

[0025] Figure 7 It is a structural schematic diagram at the corresponding position of the limit cover of the present invention.

[0026] Figure 8 It is a structural schematic diagram at the corresponding position of the lifting pull rod of the present invention.

[0027] Figure 9 This is a schematic diagram of the structure at the corresponding position of the embedded card slot of the present invention.

[0028] Figure 10 This is a schematic diagram of the structure at the corresponding position of the position-adjusting plate of the present invention.

[0029] Figure 11 This is a schematic diagram of the structure at the corresponding position of the deformable pressure strip of the present invention.

[0030] Figure 12 This is a schematic diagram of the structure at the corresponding position of the rectangular filter plate of the present invention.

[0031] Figure 13 This is a schematic diagram of the structure at the corresponding position of the rounded rectangular groove of the present invention.

[0032] Figure 14 This is a schematic diagram of the structure at the corresponding position of the positioning card slot of the present invention.

[0033] In the figure: 1. Pump body; 2. Connecting pipe; 3. Sealing cover plate; 4. Installation screw; 5. Installation bolt; 6. Circular installation cylinder; 7. Pressure relief cylinder; 8. One-way exhaust valve; 9. Electric push rod; 10. Circular fixing plug; 11. Circular rubber plug; 12. Air guide pipe; 13. Sealing plug; 14. Limit cover; 15. Sealing ring; 16. Spherical grip; 17. Trapezoidal installation sleeve; 18. Docking strip; 19. Position-adjusting plate; 20. Fixed rod; 21. Lifting pull rod; 2101. Embedded card slot; 22. First fixing sleeve; 23. Ring-shaped clamping sleeve; 24. Movable rotating rod; 25. Deformable pressure strip; 26. Second fixing sleeve; 27. First connecting rod; 28. Rectangular installation seat; 2801. Guide chute; 2802. Positioning card slot; 29. Positioning insertion strip; 30. Second connecting rod; 31. Assembled hinge; 32. Angle-adjustable rod; 33. Protective sleeve; 34. Movable insertion frame; 35. Rectangular filter plate; 36. Rounded rectangular groove; 37. Countersunk head bolt; 38. Oblique hook plate; 39. Sealing and leak-proof strip. Detailed implementation manners

[0034] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0035] Please refer to Figures 1 to 14, the present invention provides a technical solution: a switching mechanism for a Roots pump that can switch between a dry and a sewage channel, which is used for a Roots pump that can switch between a dry and a sewage channel. The Roots pump includes a pump body 1 and connecting pipes 2 arranged on both sides of the pump body 1. A structure for driving the flow of gas and liquid is installed inside the pump body 1. The connecting pipes 2 on both sides of the pump body 1 are used to enter and discharge corresponding substances to achieve normal transportation. A sealing cover plate 3 is movably installed on one side of the pump body 1. An installation screw 4 is fixedly installed on the side of the pump body 1 where the sealing cover plate 3 is installed. An installation bolt 5 is threadedly connected to the installation screw 4, and the installation bolt 5 supports at the corresponding position on the outer wall of the sealing cover plate 3. Rotate the installation bolt 5 to remove the installation bolt 5 from the installation screw 4, and thus remove the sealing cover plate 3 from the installation screw 4. After the sealing cover plate 3 is removed, the valve flap that drives the movement of substances inside the pump body 1 is exposed, which is convenient for repairing and inspecting the structure inside the pump body 1 and improves adaptability and convenience. At the central position on the side of the sealing cover plate 3 away from the pump body 1, there is a circular installation cylinder 6. The circular installation cylinder 6 is a barrel-shaped structure with one side open. A pressure relief cylinder 7 is fixedly installed on the sealing cover plate 3 at the position corresponding to the circular installation cylinder 6. The inner wall of the pressure relief cylinder 7 and the inner wall of the sealing cover plate 3 are located in the same vertical plane, so as to ensure the flatness of the structures inside the pump body 1 where the pressure relief cylinder 7 and the sealing cover plate 3 are located. A plurality of one-way exhaust valves 8 are arranged on the pressure relief cylinder 7. Through the one-way design of the one-way exhaust valves 8, it is ensured that the gas and liquid inside the structure composed of the pump body 1 and the sealing cover plate 3 can move into the structure composed of the circular rubber plug 11 and the pressure relief cylinder 7 through the one-way exhaust valves 8. An electric push rod 9 is fixedly installed on the outer wall of the circular installation cylinder 6. A circular fixed plug 10 located inside the pressure relief cylinder 7 is fixedly installed on the piston rod of the electric push rod 9. A circular rubber plug 11 is fixedly installed on the side of the circular fixed plug 10 away from the circular installation cylinder 6, and the circular rubber plug 11 is also located inside the pressure relief cylinder 7. The piston rod of the electric push rod 9 pushes the circular fixed plug 10 and the circular rubber plug 11 to move, so as to ensure the movement of the circular fixed plug 10 and the circular rubber plug 11 inside the pressure relief cylinder 7. When the circular fixed plug 10 and the circular rubber plug 11 move inside the pressure relief cylinder 7, the air pressure inside the structure composed of the pressure relief cylinder 7 and the circular rubber plug 11 is changed. A gas guide pipe 12 is fixedly installed on the structure composed of the circular fixed plug 10 and the circular rubber plug 11. The gas guide pipe 12 will move on the circular installation cylinder 6, so as to ensure the normal movement of the circular fixed plug 10 and the circular rubber plug 11. The end of the gas guide pipe 12 passes through the circular fixed plug 10 and the circular rubber plug 11 and is located inside the pressure relief cylinder 7. A sealing plug 13 is movably inserted into the gas guide pipe 12, and a limit cover 14 is fixedly installed at the end of the sealing plug 13 away from the gas guide pipe 12. The structure composed of the sealing plug 13 and the limit cover 14 is movably installed inside the gas guide pipe 12, so as to ensure the gas communication effect between the gas guide pipe 12 and the structure composed of the pressure relief cylinder 7 and the circular rubber plug 11.

[0036] Multiple sets of sealing rings 15 are provided on the outer wall of the sealing plug 13, and the sealing rings 15 are equidistantly arranged on the sealing plug 13. The sealing rings 15 are equidistantly arranged on the sealing plug 13 and can deform. Through the movement of the sealing plug 13 in the air duct 12, the fixing effect of the sealing plug 13 in the air duct 12 is ensured, the relative friction between the sealing plug 13 and the air duct 12 is increased, and the fixing effect of the sealing plug 13 in the air duct 12 is improved.

[0037] A spherical grip 16 is fixedly installed on the side of the limit cover 14 away from the sealing plug 13. Through the oval spherical grip 16 and the existence of the spherical grip 16, the movement of the sealing plug 13 and the limit cover 14 is assisted. By applying pressure to the spherical grip 16, the sealing plug 13 and the limit cover 14 are driven to move, realizing the disassembly of the structure composed of the sealing plug 13 and the limit cover 14 in the air duct 12.

[0038] The sealing plug 13, the limit cover 14, the sealing rings 15 and the spherical grip 16 are of an integrally formed structure, improving the manufacturing convenience of the structure composed of the sealing plug 13, the limit cover 14, the sealing rings 15 and the spherical grip 16. Moreover, the manufacturing materials of the sealing plug 13, the limit cover 14, the sealing rings 15 and the spherical grip 16 are the same, and they are injection molded through a mold.

[0039] The pressure relief cylinder 7 and the circular fixed plug 10 and the circular rubber plug 11 form a sealed cavity. The circular rubber plug 11 is a circular sealing disc structure. The structure composed of the circular rubber plug 11 and the circular fixed plug 10 is movably installed in the pressure relief cylinder 7. Through the cooperation of the pressure relief cylinder 7 and the circular rubber plug 11, the change of the air pressure in the structure composed of the pressure relief cylinder 7 and the circular rubber plug 11 is realized.

[0040] For a switching mechanism of a Roots pump capable of switching between a dry type and a sewage channel, a trapezoidal mounting sleeve 17 is provided on the side of the connecting pipe 2 away from the pump body 1. Docking strips 18 are provided on both the connecting pipe 2 and the trapezoidal mounting sleeve 17 close to one side, and bolts are provided for fixing between the two docking strips 18. Through the cooperation of the connecting pipe 2 and the trapezoidal mounting sleeve 17, the installation of the structure on the trapezoidal mounting sleeve 17 is realized.

[0041] A positioning plate 19 is arranged inside the trapezoidal mounting sleeve 17. A fixing rod 20 is fixedly installed on one side of the positioning plate 19 close to the connecting pipe 2. A lifting pull rod 21 is movably inserted into the trapezoidal mounting sleeve 17. A first fixing sleeve 22 is fixedly installed on the part of the lifting pull rod 21 located inside the trapezoidal mounting sleeve 17. The first fixing sleeve 22 is movably sleeved on the fixing rod 20. An annular clamping sleeve 23 is fixedly installed at the other end of the positioning plate 19 away from the fixing rod 20. A movable rotating rod 24 is rotatably connected to the trapezoidal mounting sleeve 17. The annular clamping sleeve 23 is movably sleeved on the movable rotating rod 24. Deformable pressure strips 25 are fixedly installed on both the upper surface and the lower surface of the side of the positioning plate 19 close to the fixing rod 20. The lifting and lowering of the lifting pull rod 21 inside the trapezoidal mounting sleeve 17 drives the first fixing sleeve 22 to lift and lower. The first fixing sleeve 22 drives the fixing rod 20 to lift and lower. The lifting and lowering of the fixing rod 20 drives one end of the positioning plate 19 to lift and lower. The annular clamping sleeve 23 at the other end of the positioning plate 19 rotates on the movable rotating rod 24. When the deformable pressure strips 25 lift and lower, they will contact the top and bottom inner walls of the trapezoidal mounting sleeve 17, so as to realize the sealing of the movable insertion frame 34 and the rectangular filter plate 35 at the corresponding positions, thus ensuring the switching between the lower dry type and the upper sewage channels.

[0042] Second fixing sleeves 26 are fixedly installed at both the top and the bottom of the lifting pull rod 21. A first connecting rod 27 is arranged between the second fixing sleeves 26 for connection. Due to the existence of the second fixing sleeves 26 and the first connecting rod 27, the synchronous lifting and lowering of the two lifting pull rods 21 is assisted.

[0043] A rectangular mounting seat 28 is arranged at the top of the connecting pipe 2. A guiding chute 2801 and a positioning card slot 2802 are opened at the top of the rectangular mounting seat 28. A structure composed of a positioning insert 29 and a second connecting rod 30 is slidably connected inside the rectangular mounting seat 28. The positioning insert 29 is movably clamped in the equally spaced embedded card slots 2101 opened on the lifting pull rod 21. The spacing between the embedded card slots 2101 is the same as the lifting height of the fixing rod 20, so as to ensure that the positioning insert 29 is clamped in the corresponding embedded card slots 2101 after the lifting pull rod 21 lifts and lowers. A prefabricated hinge 31 is fixedly installed at the top of the positioning insert 29. The prefabricated hinge 31 is located in the guiding chute 2801. An angle adjustable rod 32 is rotatably connected to the prefabricated hinge 31. A protective sleeve 33 is fixedly installed at the end of the angle adjustable rod 32 away from the prefabricated hinge 31. The protective sleeve 33 is movably clamped in the positioning card slot 2802. By pulling up the protective sleeve 33 and the angle adjustable rod 32 to move, the structure composed of the protective sleeve 33 and the angle adjustable rod 32 rotates around the prefabricated hinge 31. The structure composed of the protective sleeve 33 and the angle adjustable rod 32 moves in the guiding chute 2801, and through the clamping of the positioning insert 29 in the embedded card slots 2101, the fixing of the lifting pull rod 21 after lifting is ensured.

[0044] On the side of the trapezoidal mounting sleeve 17 away from the connecting pipe 2, a movable insertion frame 34 is fixedly installed. A rectangular filter plate 35 is movably inserted into the movable insertion frame 34. A rounded rectangular groove 36 is formed on the rectangular filter plate 35. A countersunk bolt 37 threadedly connected to the movable insertion frame 34 is arranged in the rounded rectangular groove 36. An inclined hook plate 38 is arranged at the bottom of the rectangular filter plate 35. The inclined hook plate 38 is low on the side close to the rectangular filter plate 35 and high on the side away from the rectangular filter plate 35, forming a groove for receiving part of the filtration. Sealing and leak-proof tapes 39 are arranged at the corresponding positions at the bottom and top of the movable insertion frame 34. The sealing and leak-proof tapes 39 seal the top of the upper movable insertion frame 34 and the bottom of the lower movable insertion frame 34, and the sealing and leak-proof tapes 39 can be connected by glue, adhesive, etc.

[0045] Working principle:

[0046] First step: By applying a pulling force to the protective sleeve 33, the structure composed of the protective sleeve 33 and the angle-adjustable rod 32 rotates around the assembled hinge 31. When the structure composed of the angle-adjustable rod 32 and the protective sleeve 33 rotates around the assembled hinge 31, the protective sleeve 33 no longer plays a limiting role. Pull the angle-adjustable rod 32 to move in the guiding chute 2801, so that the positioning insert 29 disengages from the embedded card slot 2101 and no longer presses and fixes the lifting rod 21. The lifting rod 21 can be lifted and lowered normally. Pull the first connecting rod 27 to apply pressure to the second fixed sleeve 26 and the lifting rod 21, thereby applying a pulling force to the lifting rod 21. When the lifting rod 21 is lifted and lowered under the pulling force, it drives the first fixed sleeve 22 to lift and lower. When the first fixed sleeve 22 is lifted and lowered, it applies pressure to the fixed rod 20, thereby driving one end of the adjustment plate 19 close to the fixed rod 20 to lift and lower. The deformable pressure strip 25 is driven to lift and lower. The deformable pressure strip 25 contacts the top and bottom inner walls of the trapezoidal mounting sleeve 17. Through the deformation of the deformable pressure strip 25, the sealing effect at the contact position between the end of the adjustment plate 19 and the trapezoidal mounting sleeve 17 is ensured. When the fixed rod 20 moves upward, the corresponding movable insertion frame 34 and rectangular filter plate 35 of the sewage channel are sealed. When the fixed rod 20 moves downward, the corresponding movable insertion frame 34 and rectangular filter plate 35 of the dry type are sealed. After the adjustment is completed, through the reverse movement of the protective sleeve 33 and the angle-adjustable rod 32, the protective sleeve 33 is engaged in the positioning card slot 2802, so as to ensure that the positioning insert 29 is engaged in the embedded card slot 2101 at the corresponding position, realizing the fixation of the lifting rod 21 after adjustment, and thus realizing the fixation of the adjustment plate 19.

[0047] Step 2: When the dry debris passes through the structure composed of the movable insert frame 34 and the rectangular filter plate 35 below, the rectangular filter plate 35 blocks the larger particles in the dry debris, and the blocked particles fall into the groove composed of the rectangular filter plate 35 and the oblique hook plate 38. After the countersunk bolt 37 is removed by screwing the countersunk bolt 37, the rectangular filter plate 35 is pulled out to replace the rectangular filter plate 35. At the same time, the debris on the rectangular filter plate 35 is cleaned. When the liquid in the sewage channel passes through the movable insert frame 34 and the rectangular filter plate 35 above, the rectangular filter plate 35 filters the particles in the sewage, and the corresponding rectangular filter plate 35 can also be removed and cleaned.

[0048] Step 3: When the air pressure in the pump body 1 is too high and needs to be adjusted to ensure the material conveying effect, remove the sealing plug 13, the limit cover 14, the sealing ring 15 and the spherical handle 16 on the air duct 12. The gas in the structure composed of the pressure relief cylinder 7 and the round rubber plug 11 can be discharged from the air duct 12, and the circular solid plug 10 and the round rubber plug 11 are driven to move by the piston rod of the electric push rod 9. When the round rubber plug 11 moves, it contacts the inside of the pressure relief cylinder 7. The pressure relief cylinder 7 is pressurized by the movement of the round rubber plug 11 and the round solid plug 10, and the pressure is transmitted into the structure composed of the pump body 1 and the sealing cover plate 3 through the one-way exhaust valve 8, and the air pressure in the structure composed of the pump body 1 and the sealing cover plate 3 is discharged to ensure the normal conveying of the material in the pump body 1 and the sealing cover plate 3.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A switching mechanism for a Roots pump with switchable dry and sewage channels, which is used for a Roots pump with switchable dry and sewage channels. The Roots pump includes a pump body (1) and connecting pipes (2) arranged on both sides of the pump body (1), and is characterized in that: On one side of the pump body (1), a sealing cover plate (3) is movably installed. On the side of the pump body (1) where the sealing cover plate (3) is installed, an installation screw rod (4) is fixedly installed. An installation bolt (5) is threadedly connected to the installation screw rod (4), and the installation bolt (5) supports at the corresponding position on the outer wall of the sealing cover plate (3). At the central position on the side of the sealing cover plate (3) away from the pump body (1), a circular installation cylinder (6) is provided. At the position corresponding to the circular installation cylinder (6) on the sealing cover plate (3), a pressure relief cylinder (7) is fixedly installed. A plurality of one-way exhaust valves (8) are provided on the pressure relief cylinder (7). An electric push rod (9) is fixedly installed on the outer wall of the circular installation cylinder (6). A circular solid plug (10) located inside the pressure relief cylinder (7) is fixedly installed on the piston rod of the electric push rod (9). A circular rubber plug (11) is fixedly installed on the side of the circular solid plug (10) away from the circular installation cylinder (6), and the circular rubber plug (11) is also located inside the pressure relief cylinder (7). A gas guide pipe (12) is fixedly installed on the circular solid plug (10) and the circular rubber plug (11) in a structural manner. The end of the gas guide pipe (12) passes through the circular solid plug (10) and the circular rubber plug (11) and is located inside the pressure relief cylinder (7). A sealing plug (13) is movably inserted into the gas guide pipe (12), and a limit cover (14) is fixedly installed at the end of the sealing plug (13) away from the gas guide pipe (12); On the side of the connecting pipe (2) away from the pump body (1), a trapezoidal installation sleeve (17) is provided. Docking strips (18) are provided on both the connecting pipe (2) and the trapezoidal installation sleeve (17) near one side, and bolts are provided for fixation between the two docking strips (18); A position adjustment plate (19) is provided inside the trapezoidal installation sleeve (17). A fixing rod (20) is fixedly installed on the side of the position adjustment plate (19) close to the connecting pipe (2). A lifting pull rod (21) is movably inserted into the trapezoidal installation sleeve (17). A first fixing sleeve (22) is fixedly installed on the part of the lifting pull rod (21) located inside the trapezoidal installation sleeve (17). The first fixing sleeve (22) is movably sleeved on the fixing rod (20). An annular clamping sleeve (23) is fixedly installed at the other end of the position adjustment plate (19) away from the fixing rod (20). A movable rotating rod (24) is rotatably connected to the trapezoidal installation sleeve (17). The annular clamping sleeve (23) is movably sleeved on the movable rotating rod (24). Deformable pressure strips (25) are fixedly installed on both the upper surface and the lower surface of the side of the position adjustment plate (19) close to the fixing rod (20); Second fixing sleeves (26) are fixedly installed at both the top and the bottom of the lifting pull rod (21), and a first connecting rod (27) is provided for connection between the second fixing sleeves (26); A rectangular mounting base (28) is provided at the top of the connecting pipe (2). A guiding chute (2801) and a positioning clamping groove (2802) are provided at the top of the rectangular mounting base (28). A structure composed of a positioning insertion bar (29) and a second connecting rod (30) is slidably connected in the rectangular mounting base (28). The positioning insertion bar (29) is movably clamped in the embedded clamping grooves (2101) equidistantly arranged on the lifting pull rod (21). A prefabricated hinge (31) is fixedly installed at the top of the positioning insertion bar (29). The prefabricated hinge (31) is located in the guiding chute (2801). An angle adjustable rod (32) is rotatably connected to the prefabricated hinge (31). A protective sleeve (33) is fixedly installed at one end of the angle adjustable rod (32) away from the prefabricated hinge (31). The protective sleeve (33) is movably clamped in the positioning clamping groove (2802). A movable insertion frame (34) is fixedly installed on one side of the trapezoidal mounting sleeve (17) away from the connecting pipe (2). A rectangular filter plate (35) is movably inserted into the movable insertion frame (34). A rounded rectangular groove (36) is provided on the rectangular filter plate (35). A countersunk bolt (37) threadedly connected to the movable insertion frame (34) is arranged in the rounded rectangular groove (36). An inclined hook plate (38) is provided at the bottom of the rectangular filter plate (35). Sealing and leak-proof tapes (39) are provided at corresponding positions at the bottom and top of the movable insertion frame (34).

2. The switching mechanism according to claim 1, characterized in that: Multiple groups of sealing rings (15) are provided on the outer wall of the sealing plug (13), and the sealing rings (15) are equidistantly arranged on the sealing plug (13).

3. The switching mechanism according to claim 2, characterized in that: A spherical grip (16) is fixedly installed on one side of the limit cover (14) away from the sealing plug (13).

4. The switching mechanism according to claim 3, wherein: The sealing plug (13), the limit cover (14), the sealing rings (15) and the spherical grip (16) are of an integrally formed structure.

5. The switching mechanism according to claim 4, characterized in that: The pressure relief cylinder (7) and the circular solid plug (10) and the circular rubber plug (11) form a sealed cavity.

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