Roots pump capable of switching dry type channel and sewage channel and switching mechanism thereof

Abstract

The invention relates to the technical field of pump equipment, in particular to a roots pump capable of switching a dry type channel and a sewage channel and a switching mechanism thereof.The roots pump comprises a pump body and connecting pipes arranged on the two sides of the pump body, a sealing cover plate is movably installed on one side of the pump body, and an installation screw is fixedly installed on the side, provided with the sealing cover plate, of the pump body; the air pressure in a structure formed by the pump body and the sealing cover plate is discharged, and when some compressible materials are conveyed, the density and the flow speed of fluid can be changed by adjusting the air pressure in the pump body. When the air pressure in the pump body is reduced, the volume of fluid is expanded, the flow speed is possibly increased, the flow can be improved to a certain extent, the gas flow can be flexibly adjusted according to the requirements of downstream users, and if the pump faces sudden load change in the operation process, the output power of the pump can be rapidly adjusted by adjusting the air pressure in the pump body. And the motor or the pump body is prevented from being damaged due to overload, and higher adjustability is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of pump equipment, in particular to a Roots pump capable of switching between a dry channel and a sewage channel and a switching mechanism thereof. Background Art

[0002] Roots pump is a positive displacement vacuum pump. It is mainly composed of two "8" shaped rotors, which are installed in parallel and mesh with each other in the pump body. The shape of the rotors is designed so that they can continuously push the gas from the air inlet to the exhaust port during rotation. There is a very small gap between the rotors and between the rotor and the pump body, usually between 0.1-0.5mm, to ensure the sealing and smooth rotation of the rotor. Roots pump has good compatibility with various gases, whether it is permanent gas (such as nitrogen, oxygen, etc.) or condensable gas (such as water vapor, organic solvent vapor, etc.), it can perform effective pumping operations.

[0003] When the Roots pump is in operation, the inside is in a certain vacuum or pressure state. If the pressure cannot be released directly, when the system suddenly needs to stop running or an emergency occurs, the internal pressure cannot be adjusted quickly. For example, during the sewage suction operation, if a short circuit or power failure occurs or the equipment fails, the pressure in the Roots pump cannot be released in time. Due to external factors (such as temperature changes, the associated influence of subsequent equipment, etc.), the pressure in the pump may change suddenly. This sudden change in pressure may cause the pump body to be subjected to great stress shock, resulting in damage to the pump body structure, such as pump casing rupture or rotor deformation. In extreme cases, it may cause leakage or even explosion and other serious safety accidents, posing a threat to the life safety of operators. Summary of the invention

[0004] The object of the present invention is to provide a Roots pump capable of switching between dry and sewage channels and a switching mechanism thereof, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a Roots pump capable of switching between dry and sewage channels, comprising a pump body and connecting pipes arranged on both sides of the pump body, a sealing cover plate being movably mounted on one side of the pump body, a mounting screw being fixedly mounted on the side of the pump body on which the sealing cover plate is mounted, a mounting bolt being threadedly connected to the mounting screw, and the mounting bolt being supported at a corresponding position on the outer wall of the sealing cover plate, a circular mounting cylinder being arranged at a central position on a side of the sealing cover plate away from the pump body, a pressure relief cylinder being fixedly mounted on the sealing cover plate at a position corresponding to the circular mounting cylinder, and a mounting screw being provided on the pressure relief cylinder A plurality of one-way exhaust valves are arranged, an electric push rod is fixedly mounted on the outer wall of the circular mounting cylinder, a circular solid plug located in the pressure relief cylinder is fixedly mounted on the piston rod of the electric push rod, a circular rubber plug is fixedly mounted on the side of the circular solid plug away from the circular mounting cylinder, and the circular rubber plug is also located in the pressure relief cylinder, an air guide tube is fixedly mounted on the structure composed of the circular solid plug and the circular rubber plug, the end of the air guide tube passes through the circular solid plug and the circular rubber plug and is located in the pressure relief cylinder, a sealing plug is movably inserted in the air guide tube, and a limiting cover is fixedly mounted on the end of the sealing plug away from the air guide tube.

[0006] Preferably, a plurality of groups of sealing rings are arranged on the outer wall of the sealing plug, and the sealing rings are arranged at equal distances on the sealing plug.

[0007] Preferably, a spherical handle is fixedly mounted on a side of the limiting cover away from the sealing plug.

[0008] Preferably, the sealing plug, the limiting cover, the sealing ring and the spherical handle are an integrally formed structure.

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

[0010] A Roots pump capable of switching between dry and sewage channels, wherein a trapezoidal mounting sleeve is arranged on the side of the connecting pipe away from the pump body, a butt joint strip is arranged on the side close to the connecting pipe and the trapezoidal mounting sleeve, and bolts are arranged between the two butt joint strips for fixing.

[0011] Preferably, an adjusting plate is provided in the trapezoidal mounting sleeve, a fixing rod is fixedly installed on the side of the adjusting plate close to the connecting pipe, a lifting pull rod is movably inserted on the trapezoidal mounting sleeve, a first fixing sleeve is fixedly installed on the part of the lifting pull rod located in the trapezoidal mounting sleeve, the first fixing sleeve is movably mounted on the fixing rod, an annular clamping sleeve is fixedly installed on the other end of the adjusting plate away from the fixing rod, a movable rotating rod is rotatably connected to the trapezoidal mounting sleeve, the annular clamping sleeve is movably mounted on the movable rotating rod, and deformable pressure strips are fixedly installed on the upper and lower surfaces of the side of the adjusting plate close to the fixed rod.

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

[0013] Preferably, a rectangular mounting seat is provided on the top of the connecting tube, and a guide slot and a positioning slot are provided on the top of the rectangular mounting seat. A structure consisting of a positioning strip and a second connecting rod is slidably connected in the rectangular mounting seat, and the positioning strip is movably engaged in embedded slots equidistantly opened on the lifting pull rod. An assembled hinge is fixedly installed on the top of the positioning strip, and the assembled hinge is located in the guide slot. An angle-adjustable rod is rotatably connected to the assembled hinge, and a protective sleeve is fixedly installed on the end of the angle-adjustable rod away from the assembled hinge, and the protective sleeve is movably engaged in the positioning slot.

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

[0015] Compared with the prior art, the present invention has the following beneficial effects: 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 sealing plug, limit cover, sealing ring and spherical handle on the air guide pipe. The gas in the pressure relief cylinder and the round rubber plug structure can be discharged from the air guide pipe. The pressure relief cylinder is pressurized by the movement of the round rubber plug and the round solid plug, and the pressure is transmitted through the one-way exhaust valve into the structure composed of the pump body and the sealing cover plate. The air pressure in the pump body and the sealing cover plate structure is discharged. When conveying some compressible materials, the density and flow rate of the fluid can be changed by adjusting the air pressure in the pump body. When the air pressure in the pump body decreases, the volume of the fluid expands and the flow rate may increase. To a certain extent, the flow rate can be increased, and the gas flow rate can be flexibly adjusted according to the needs of downstream users. If the load faced by the pump changes suddenly during operation, adjusting the air pressure in the pump body can quickly adjust the output power of the pump to avoid damage to the motor or pump body due to overload, and it has stronger adjustability.

[0016] 2. When dry debris passes through the structure composed of the movable plug-in frame and the rectangular filter plate below, the rectangular filter plate blocks the larger particles in the dry debris. The blocked particles fall into the groove composed of the rectangular filter plate and the oblique hook plate. The rectangular filter plate is pulled out to clean the debris on the rectangular filter plate. When the liquid in the sewage channel passes through the movable plug-in frame and the rectangular filter plate above, the corresponding rectangular filter plate can also be removed and cleaned. Larger debris entering the pump body may cause local changes in the flow channel inside the pump, causing fluctuations in the flow rate and pressure of the fluid. Stable flow and pressure output are more important for the cleaning process, thereby ensuring the stability of fluid transportation.

[0017] 3. By applying tension to the protective sleeve, the protective sleeve and the angle-adjustable rod structure rotate around the assembled hinge. When the angle-adjustable rod and the protective sleeve structure rotate around the assembled hinge, the lifting pull rod is lifted and lowered by the tension, driving the first fixed sleeve to lift and lower, thereby driving the adjustment plate to lift and lower near one end of the fixed rod. The deformable pressure strip contacts the top and bottom of the inner wall of the trapezoidal mounting sleeve. When the fixed rod moves upward, the movable plug-in frame and the rectangular filter plate of the corresponding sewage channel are sealed. When the fixed rod moves downward, the corresponding dry movable plug-in frame and the rectangular filter plate are sealed. When switching different feed ends, the pump body can be cleaned and maintained in a targeted manner during the gap between feed switching, so as to achieve better use effect. Through the design of the rapid switching system of the dry and sewage suction channels, the suction mode can be quickly switched, and the two working modes of dry materials such as sand, gravel and soil and wet materials such as sewage sludge are integrated. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view structural schematic diagram of the present invention.

[0019] Figure 2 It is a side view structural schematic diagram of the present invention.

[0020] Figure 3 It is a schematic diagram of the top view structure of the present invention.

[0021] Figure 4 It is a schematic diagram of the structure at the corresponding position of the circular mounting cylinder of the present invention.

[0022] Figure 5 It is a schematic diagram of the structure at the corresponding position of the spherical handle of the present invention.

[0023] Figure 6 It is a structural schematic diagram of the corresponding position of the pressure relief cylinder of the present invention.

[0024] Figure 7 It is a schematic diagram of the structure at the corresponding position of the limiting cover of the present invention.

[0025] Figure 8 It is a schematic diagram of the structure at the corresponding position of the lifting pull rod of the present invention.

[0026] Fig. 9 It is a structural schematic diagram of the corresponding position of the embedded card slot of the present invention.

[0027] Fig.10 It is a structural schematic diagram of the corresponding position of the adjustment plate of the present invention.

[0028] Fig.11 It is a schematic diagram of the structure of the corresponding position of the deformable pressure strip of the present invention.

[0029] Fig.12 It is a schematic diagram of the structure at the corresponding position of the rectangular filter plate of the present invention.

[0030] Fig.13 It is a schematic diagram of the structure at the corresponding position of the rounded rectangular groove of the present invention.

[0031] Fig.14 It is a schematic diagram of the structure at the corresponding position of the positioning slot of the present invention.

[0032] In the figure: 1. Pump body; 2. Connecting pipe; 3. Sealing cover plate; 4. Mounting screw; 5. Mounting bolt; 6. Round mounting cylinder; 7. Pressure relief cylinder; 8. One-way exhaust valve; 9. Electric push rod; 10. Round solid plug; 11. Round rubber plug; 12. Air guide tube; 13. Sealing plug; 14. Limiting cover; 15. Sealing ring; 16. Spherical grip; 17. Trapezoidal mounting sleeve; 18. Docking strip; 19. Adjustment plate; 20. Fixing rod; 21. Lifting pull rod; 2101. Embedded card slot; 22. The first fixed sleeve; 23, annular sleeve; 24, movable rotating rod; 25, deformable pressure strip; 26, second fixed sleeve; 27, first connecting rod; 28, rectangular mounting seat; 2801, guide slide groove; 2802, positioning slot; 29, positioning insert strip; 30, second connecting rod; 31, assembled hinge; 32, angle-adjustable rod; 33, protective sleeve; 34, movable insert frame; 35, rectangular filter plate; 36, rounded rectangular groove; 37, countersunk bolt; 38, oblique hook plate; 39, sealing and leak-proof belt. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figures 1 to 14The present invention provides a technical solution: a Roots pump capable of switching between dry and sewage channels, comprising 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 installed in 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, a mounting screw 4 is fixedly installed on one side of the pump body 1 where the sealing cover plate 3 is installed, a mounting screw 4 is threadedly connected to the mounting screw 4, and the mounting bolt 5 is supported at a corresponding position on the outer wall of the sealing cover plate 3, the mounting bolt 5 is rotated, and the mounting bolt 5 on the mounting screw 4 is removed, thereby removing the sealing cover plate 3 from the mounting screw 4, and sealing After the cover plate 3 is removed, the valve disc that drives the movement of the material in the pump body 1 is exposed, which is convenient for maintenance and inspection of the structure in the pump body 1 and improves adaptability. A circular mounting cylinder 6 is provided at the center position of the side of the sealing cover plate 3 away from the pump body 1. The circular mounting cylinder 6 is a barrel-shaped structure with one side open. A pressure relief cylinder 7 is fixedly installed at the position corresponding to the circular mounting cylinder 6 on the sealing cover plate 3. The inner wall of the pressure relief cylinder 7 and the inner wall of the sealing cover plate 3 are located on the same vertical plane, thereby ensuring that the pressure relief cylinder 7 and the sealing cover plate 3 are located in the flat structure of the pump body 1. A plurality of one-way exhaust valves 8 are provided on the pressure relief cylinder 7. The one-way design of the one-way exhaust valve 8 ensures that the gas in the structure composed of the pump body 1 and the sealing cover plate 3 The liquid can move into the structure composed of the circular rubber plug 11 and the pressure relief cylinder 7 through the one-way exhaust valve 8. An electric push rod 9 is fixedly installed on the outer wall of the circular mounting cylinder 6. A circular solid plug 10 located in 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 mounting cylinder 6, and the circular rubber plug 11 is also located in the pressure relief cylinder 7. The piston rod of the electric push rod 9 pushes the circular solid plug 10 and the circular rubber plug 11 to move, thereby ensuring that the circular solid plug 10 and the circular rubber plug 11 move in the pressure relief cylinder 7. When the circular solid plug 10 and the circular rubber plug 11 move in the pressure relief cylinder 7, the pressure relief cylinder 7 and the circular solid plug 10 are changed. The air pressure in the rubber plug 11 structure is determined by fixing an air duct 12 on the structure composed of the circular solid plug 10 and the circular rubber plug 11. The air duct 12 will move on the circular mounting tube 6, thereby ensuring the normal movement of the circular solid plug 10 and the circular rubber plug 11. The end of the air duct 12 passes through the circular solid plug 10 and the circular rubber plug 11 and is located in the pressure relief tube 7. A sealing plug 13 is movably inserted in the air duct 12, and a limiting cover 14 is fixedly installed on one end of the sealing plug 13 away from the air duct 12. The structure composed of the sealing plug 13 and the limiting cover 14 is movably installed in the air duct 12, thereby ensuring the gas communication effect between the air duct 12 and the structure composed of the pressure relief tube 7 and the circular rubber plug 11.

[0035] A plurality of sealing rings 15 are arranged on the outer wall of the sealing plug 13, and the sealing rings 15 are arranged equidistantly on the sealing plug 13. The sealing rings 15 are equidistantly on the sealing plug 13, and the sealing rings 15 can be deformed. The movement of the sealing plug 13 in the air duct 12 ensures the fixing effect of the sealing plug 13 in the air duct 12, improves the relative friction between the sealing plug 13 and the air duct 12, and improves the fixing effect of the sealing plug 13 in the air duct 12.

[0036] A spherical handle 16 is fixedly installed on the side of the limiting cover 14 away from the sealing plug 13. The elliptical spherical handle 16 assists the movement of the sealing plug 13 and the limiting cover 14. By applying pressure to the spherical handle 16, the sealing plug 13 and the limiting cover 14 are driven to move, thereby realizing the separation of the structure composed of the sealing plug 13 and the limiting cover 14 in the air duct 12.

[0037] The sealing plug 13, the limiting cover 14, the sealing ring 15 and the spherical handle 16 are an integrally formed structure, which improves the manufacturing convenience of the structure composed of the sealing plug 13, the limiting cover 14, the sealing ring 15 and the spherical handle 16. The sealing plug 13, the limiting cover 14, the sealing ring 15 and the spherical handle 16 are made of the same material and are injection molded by a mold.

[0038] The pressure relief cylinder 7, the circular solid plug 10 and the circular rubber plug 11 form a sealed cavity. The circular rubber plug 11 is a circular sealed disc structure. The structure composed of the circular rubber plug 11 and the circular solid plug 10 is movably installed in the pressure relief cylinder 7. Through the cooperation between the pressure relief cylinder 7 and the circular rubber plug 11, the change of air pressure in the structure composed of the pressure relief cylinder 7 and the circular rubber plug 11 is realized.

[0039] A switching mechanism of a Roots pump capable of switching between a dry type and a sewage channel, wherein a trapezoidal mounting sleeve 17 is provided on a side of a connecting pipe 2 away from a pump body 1, a docking strip 18 is provided on a side close to the connecting pipe 2 and the trapezoidal mounting sleeve 17, and bolts are provided between the two docking strips 18 for fixing, and the installation of the structure on the trapezoidal mounting sleeve 17 is achieved through the cooperation of the connecting pipe 2 and the trapezoidal mounting sleeve 17.

[0040] A positioning plate 19 is provided in the trapezoidal mounting sleeve 17, and a fixing rod 20 is fixedly installed on one side of the positioning plate 19 close to the connecting pipe 2. A lifting rod 21 is movably inserted on the trapezoidal mounting sleeve 17, and a first fixing sleeve 22 is fixedly installed on the part of the lifting rod 21 located in 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 on 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, and the annular clamping sleeve 23 is movably sleeved on the movable rotating rod 24. The positioning plate 19 is close to the fixing rod 20. A deformable pressure strip 25 is fixedly installed on the upper and lower surfaces of one side, and the lifting pull rod 21 is lifted and lowered in the trapezoidal mounting sleeve 17 to drive the first fixed sleeve 22 to lift and lower, and the first fixed sleeve 22 drives the fixed rod 20 to lift and lower, and the fixed rod 20 lifts and lowers to drive one end of the adjusting plate 19 to lift and lower, and the annular sleeve 23 on the other end of the adjusting plate 19 rotates on the movable rotating rod 24. When the deformable pressure strip 25 is lifted and lowered, it will contact the top and bottom of the inner wall of the trapezoidal mounting sleeve 17, thereby realizing the sealing of the movable plug-in frame 34 and the rectangular filter plate 35 at the corresponding position, thereby ensuring the switching of the dry channel below and the upper sewage channel.

[0041] The top and bottom of the lifting rod 21 are fixedly installed with second fixing sleeves 26, and the second fixing sleeves 26 are connected with a first connecting rod 27. The second fixing sleeves 26 and the first connecting rod 27 assist the synchronous lifting of the two lifting rods 21.

[0042] A rectangular mounting seat 28 is provided at the top of the connecting pipe 2, and a guide slot 2801 and a positioning slot 2802 are provided at the top of the rectangular mounting seat 28. A structure consisting of a positioning strip 29 and a second connecting rod 30 is slidably connected in the rectangular mounting seat 28. The positioning strip 29 is movably engaged in the embedded slots 2101 equidistantly provided on the lifting rod 21. The spacing between the embedded slots 2101 is the same as the lifting height of the fixed rod 20, so as to ensure that the positioning strip 29 is engaged in the corresponding embedded slot 2101 after the lifting rod 21 is lifted. An assembled hinge 31 is fixedly installed on the top of the positioning strip 29. The assembled hinge 31 is fixedly installed on the top of the positioning strip 29. 1 is located in the guide slot 2801, and the assembled hinge 31 is rotatably connected with an angle-adjustable rod 32. The end of the angle-adjustable rod 32 away from the assembled hinge 31 is fixedly installed with a protective sleeve 33, and the protective sleeve 33 is movably engaged in the positioning slot 2802. By pulling the protective sleeve 33 and the angle-adjustable rod 32 upward, the protective sleeve 33 and the angle-adjustable rod 32 form a structure that rotates around the assembled hinge 31, and the protective sleeve 33 and the angle-adjustable rod 32 form a structure that moves in the guide slot 2801, and the positioning strip 29 is engaged in the embedded slot 2101, so as to ensure the fixation of the lifting rod 21 after lifting.

[0043] A movable plug-in frame 34 is fixedly installed on the side of the trapezoidal mounting sleeve 17 away from the connecting pipe 2, and a rectangular filter plate 35 is movably inserted in the movable plug-in frame 34. A rounded rectangular groove 36 is opened on the rectangular filter plate 35, and a countersunk bolt 37 threadedly connected to the movable plug-in frame 34 is arranged in the rounded rectangular groove 36. An oblique hook plate 38 is arranged at the bottom of the rectangular filter plate 35. The oblique hook plate 38 is close to the bottom of one side of the rectangular filter plate 35 and is high on the side away from the rectangular filter plate 35, forming a groove for receiving a part of the filtration. A sealing anti-leakage belt 39 is arranged at the corresponding position of the bottom and the top of the movable plug-in frame 34, and the sealing anti-leakage belt 39 seals the top of the upper movable plug-in frame 34 and the bottom of the lower movable plug-in frame 34, and the sealing anti-leakage belt 39 can be connected by glue, adhesive, etc.

[0044] Working principle: The first step: by applying a pulling force to the protective sleeve 33, the protective sleeve 33 and the angle-adjustable rod 32 form a structure that rotates around the assembled hinge 31. When the angle-adjustable rod 32 and the protective sleeve 33 form a structure that rotates around the assembled hinge 31, the protective sleeve 33 no longer plays a limiting role, and the angle-adjustable rod 32 is pulled to move in the guide slot 2801, so that the positioning strip 29 is disengaged from the embedded card slot 2101, and the lifting rod 21 is no longer pressed and fixed. The lifting rod 21 can be lifted and lowered normally, and the first connecting rod 27 is pulled to press 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 by the pulling force, the first fixed sleeve 22 is driven to lift and lower. When the first fixed sleeve 22 is lifted and lowered, pressure is applied to the fixed rod 20, thereby driving the adjustment plate 19 to approach the fixed When one end of the fixed rod 20 is lifted or lowered, the deformable pressure strip 25 is lifted or lowered with it. The deformable pressure strip 25 contacts the top and bottom of the inner wall of the trapezoidal mounting sleeve 17. The deformation of the deformable pressure strip 25 ensures the sealing effect of the contact position between the end of the adjusting plate 19 and the trapezoidal mounting sleeve 17. When the fixed rod 20 moves upward, the movable plug-in frame 34 and the rectangular filter plate 35 corresponding to the sewage channel are sealed. When the fixed rod 20 moves downward, the movable plug-in frame 34 and the rectangular filter plate 35 corresponding to the dry type are sealed. After the adjustment is completed, the protective sleeve 33 and the angle adjustable rod 32 move in the opposite direction to allow the protective sleeve 33 to be engaged in the positioning slot 2802, thereby ensuring that the positioning strip 29 is engaged in the embedded slot 2101 at the corresponding position, thereby achieving the fixation of the lifting pull rod 21 after adjustment, thereby achieving the fixation of the adjusting plate 19.

[0045] 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 rectangular filter plate 35 is pulled out to replace the rectangular filter plate 35, and the debris on the rectangular filter plate 35 is cleaned at the same time. 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.

[0046] 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, and 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 piston rod of the electric push rod 9 drives the round solid plug 10 and the round rubber plug 11 to move. When the round rubber plug 11 moves, it contacts the inside of the pressure relief cylinder 7, and the pressure is applied to the pressure relief cylinder 7 through 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.

[0047] 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 embodiments of the present invention.

Claims

1. A Roots pump capable of switching between a dry channel and a sewage channel, comprising a pump body (1) and connecting pipes (2) arranged on both sides of the pump body (1), characterized in that: A sealing cover plate (3) is movably mounted on one side of the pump body (1); a mounting screw (4) is fixedly mounted on the side of the pump body (1) on which the sealing cover plate (3) is mounted; a mounting bolt (5) is threadedly connected to the mounting screw (4), and the mounting bolt (5) is supported at a corresponding position on the outer wall of the sealing cover plate (3); a circular mounting cylinder (6) is arranged at a central position on a side of the sealing cover plate (3) away from the pump body (1); a pressure relief cylinder (7) is fixedly mounted on the sealing cover plate (3) at a position corresponding to the circular mounting cylinder (6); a plurality of one-way exhaust valves (8) are arranged on the pressure relief cylinder (7); an electric push rod (9) is fixedly mounted on the outer wall of the circular mounting cylinder (6); and the electric push rod (9) is fixedly mounted on the outer wall of the circular mounting cylinder (6). A circular solid plug (10) located in the pressure relief cylinder (7) is fixedly mounted on the piston rod of the rod (9); a circular rubber plug (11) is fixedly mounted on the side of the circular solid plug (10) away from the circular mounting cylinder (6), and the circular rubber plug (11) is also located in the pressure relief cylinder (7); an air guide tube (12) is fixedly mounted on the structure formed by the circular solid plug (10) and the circular rubber plug (11); the end of the air guide tube (12) passes through the circular solid plug (10) and the circular rubber plug (11) and is located in the pressure relief cylinder (7); a sealing plug (13) is movably inserted in the air guide tube (12), and a limiting cover (14) is fixedly mounted on the end of the sealing plug (13) away from the air guide tube (12).

2. A Roots pump capable of switching between dry and sewage channels according to claim 1, characterized in that: A plurality of groups of sealing rings (15) are arranged on the outer wall of the sealing plug (13), and the sealing rings (15) are arranged at equal intervals on the sealing plug (13).

3. A Roots pump capable of switching between dry and sewage channels according to claim 2, characterized in that: A spherical handle (16) is fixedly mounted on a side of the limiting cover (14) away from the sealing plug (13).

4. A Roots pump capable of switching between dry and sewage channels according to claim 3, characterized in that: The sealing plug (13), the limiting cover (14), the sealing ring (15) and the spherical handle (16) are an integrally formed structure.

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

6. A switching mechanism of a Roots pump capable of switching between a dry channel and a sewage channel, used for a Roots pump capable of switching between a dry channel and a sewage channel as claimed in any one of claims 1 to 3, characterized in that: A trapezoidal mounting sleeve (17) is provided on the side of the connecting pipe (2) away from the pump body (1), and a butt joint strip (18) is provided on the side close to the connecting pipe (2) and the trapezoidal mounting sleeve (17), and bolts are provided between the two butt joint strips (18) for fixing.

7. A switching mechanism for a Roots pump capable of switching between a dry channel and a sewage channel according to claim 6, characterized in that: A positioning plate (19) is arranged inside the trapezoidal mounting sleeve (17), a fixing rod (20) is fixedly mounted on the side of the positioning plate (19) close to the connecting pipe (2), a lifting rod (21) is movably inserted on the trapezoidal mounting sleeve (17), a first fixing sleeve (22) is fixedly mounted on the part of the lifting rod (21) located inside the trapezoidal mounting sleeve (17), the first fixing sleeve (22) is movably mounted on the fixing rod (20), an annular clamping sleeve (23) is fixedly mounted on 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 mounted on the movable rotating rod (24), and a deformable pressure strip (25) is fixedly mounted on the upper surface and the lower surface of the side of the positioning plate (19) close to the fixing rod (20).

8. The switching mechanism of a Roots pump capable of switching between a dry channel and a sewage channel according to claim 7, characterized in that: The top and bottom of the lifting rod (21) are both fixedly mounted with second fixing sleeves (26), and the second fixing sleeves (26) are connected by a first connecting rod (27).

9. The switching mechanism of a Roots pump capable of switching between a dry channel and a sewage channel according to claim 8, characterized in that: A rectangular mounting seat (28) is provided at the top of the connecting tube (2). A guide slot (2801) and a positioning slot (2802) are provided at the top of the rectangular mounting seat (28). A structure consisting of a positioning strip (29) and a second connecting rod (30) is slidably connected in the rectangular mounting seat (28). The positioning strip (29) is movably engaged in embedded slots (2101) equidistantly provided on the lifting pull rod (21). An assembled hinge (31) is fixedly installed on the top of the positioning strip (29). The assembled hinge (31) is located in the guide slot (2801). An angle adjustable rod (32) is rotatably connected to the assembled hinge (31). A protective sleeve (33) is fixedly installed at one end of the angle adjustable rod (32) away from the assembled hinge (31). The protective sleeve (33) is movably engaged in the positioning slot (2802).

10. The switching mechanism of a Roots pump capable of switching between a dry channel and a sewage channel according to claim 8, characterized in that: A movable insert frame (34) is fixedly mounted on one side of the trapezoidal mounting sleeve (17) away from the connecting pipe (2), a rectangular filter plate (35) is movably inserted in the movable insert frame (34), a rounded rectangular groove (36) is provided on the rectangular filter plate (35), a countersunk bolt (37) threadedly connected to the movable insert frame (34) is provided in the rounded rectangular groove (36), an oblique hook plate (38) is provided at the bottom of the rectangular filter plate (35), and sealing anti-leakage belts (39) are provided at corresponding positions at the bottom and top of the movable insert frame (34).

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