Anti-blocking submersible sewage pump

Abstract

The invention relates to the technical field of submersible sewage pumps, in particular to an anti-blocking submersible sewage pump. Comprising a shell, the shell is fixedly connected with a trash holding frame, and the lower side of the shell is fixedly connected with an oil seal shell; the driving motor is fixedly connected into the shell, the oil seal shell is rotationally connected with a connecting shaft in a penetrating mode, and a first torsional spring is fixedly connected between an output shaft of the driving motor and the connecting shaft; the first fixed shell is fixedly connected to the lower side of the oil seal shell; and the first movable shell is slidably connected to the first fixed shell, and the connecting shaft is fixedly connected with an impeller. When the rotation resistance of the impeller is increased, the first movable shell moves, so that the volume of the transfer cavity in the first fixed shell is enlarged, the moving space of impurities in the first fixed shell is enlarged, and the impurities in the first fixed shell can be converted into a loose state from a tight state; therefore, impurities in the first fixed shell can smoothly flow out from the sewage draining exit under the action of the impeller, and the operation efficiency of the whole system is improved.

Description

Technical Field

[0001] The invention relates to the technical field of submersible sewage pumps, and in particular to an anti-blocking submersible sewage pump. Background Art

[0002] A submersible sewage pump is a special pump used to transport sewage and wastewater containing impurities such as solid particles and fibers. The impeller is driven by an electric motor to rotate at high speed, generating centrifugal force to suck the liquid from the bottom of the pump, and then pressurize it through the pump casing and discharge it through the outlet. It is commonly used in sewage treatment, municipal engineering, building drainage and other fields.

[0003] When the existing submersible sewage pump is pumping sewage, impurities in the sewage will accumulate in the pump casing of the submersible sewage pump, which will not only cause the blockage of the water suction port of the submersible sewage pump, resulting in poor sewage discharge and reduced sewage pumping efficiency of the submersible sewage pump, but also with the further accumulation and blockage of impurities, the rotation resistance of the impeller will increase, causing the load of the motor to increase, and even causing the motor to burn out. Summary of the invention

[0004] In order to overcome the shortcomings of the existing submersible sewage pumps during use, the purpose of the present invention is to provide an anti-blocking submersible sewage pump.

[0005] The technical solution is: an anti-blocking submersible sewage pump, comprising: An outer shell, wherein the outer shell is fixedly connected to a dirt-blocking frame, and an oil seal shell is fixedly connected to the lower side of the outer shell; A driving motor is fixedly connected in the housing, the oil seal housing is rotatably connected with a connecting shaft, and a first torsion spring is fixedly connected between the output shaft of the driving motor and the connecting shaft; A first fixed shell is fixedly connected to the lower side of the oil seal shell, the connecting shaft is rotatably connected to the first fixed shell, and the first fixed shell is provided with a sewage outlet; A first movable shell is slidably connected to the first fixed shell, the connecting shaft is fixedly connected to an impeller, and the impeller rotates in the first fixed shell; A trigger assembly is arranged on the connecting shaft, and is used for changing the volume between the first fixed shell and the first movable shell by changing the position of the first movable shell when the resistance to the rotation of the impeller increases.

[0006] As an improvement of the above solution, the trigger component includes: A liquid storage shell is fixedly connected to the connecting shaft, a moving ring is slidably connected inside the liquid storage shell, and a first spring is fixedly connected between the liquid storage shell and the moving ring inside the liquid storage shell; A moving block, fixedly connected to the moving ring in the liquid storage shell; A first moving rod, fixedly connected to the output shaft of the driving motor, the first moving rod being used for squeezing the moving block; The hydraulic telescopic rod is fixedly connected to the first fixed housing. The telescopic end of the hydraulic telescopic rod is fixedly connected to the first moving housing, and the fixed part of the hydraulic telescopic rod is communicated with the liquid storage housing through a hose.

[0007] As an improvement of the above solution, the moving block is provided with an inclined surface, and the height of the moving block is greater than the maximum distance that the moving ring in the liquid storage housing moves therein.

[0008] As an improvement of the above solution, it further includes: A flow path switching mechanism is arranged on the first moving housing. The flow path switching mechanism is used to change the volume of impurities entering the first fixed housing by changing the flow path of sewage entering the first fixed housing after the first moving housing moves downward. The flow path switching mechanism includes: A second moving housing is fixedly connected to the lower side of the first moving housing; A second fixed housing is fixedly connected to the trash rack. The second fixed housing is slidably connected to the second moving housing, and a plurality of flow holes are provided on both of them; A fixed frame is fixedly connected to the second moving housing; A first plugging block is fixedly connected to the second fixed housing. The first plugging block is rotationally connected to a second plugging block in a limited manner. The second plugging block is rotationally connected to a third plugging block in a limited manner. The third plugging block is fixedly connected to a connecting column. The connecting column is provided with a limiting groove, and the connecting column passes through the fixed frame and is slidably connected thereto; A driving ball is fixedly connected to the fixed frame, and the limiting groove on the connecting column is used for the driving ball to move.

[0009] As an improvement of the above solution, the first plugging block, the second plugging block and the third plugging block are all composed of two symmetrically distributed sector blocks, and the central angles of the sector blocks of the three are not less than 60°. The maximum rotation angle of the first plugging block on the second plugging block and the maximum rotation angle of the second plugging block on the third plugging block are both equal to 60°.

[0010] As an improvement of the above solution, the limiting groove on the connecting column is composed of a vertical part and an arc part, and the angle of the central angle corresponding to the projection of the arc part of the limiting groove of the connecting column on the horizontal plane is equal to 120°. The vertical part of the limiting groove of the connecting column is located above its arc part.

[0011] As an improvement of the above solution, it further includes: An intercepting plate is fixedly connected inside the second moving housing, and the intercepting plate is provided with through holes; A connecting rod. The connecting shaft is provided with through holes. The connecting rod is rotatably connected in the through holes of the connecting shaft. A second torsion spring is fixedly connected between the connecting rod and the output shaft of the driving motor; A second moving rod, slidably connected to the connecting rod. A positioning rod is slidably connected to the connecting shaft. The second moving rod is rotatably connected to the positioning rod. The first moving shell is fixedly connected with a connecting frame, and the first moving shell is rotatably connected to the positioning rod through the connecting frame thereon; A third moving rod, slidably connected to the second moving rod. A second spring is fixedly connected between the third moving rod and the second moving rod; A cutting knife, fixedly connected to the lower end of the third moving rod. The cutting knife is attached to the lower side of the intercepting plate, and the connecting column is used to squeeze the cutting knife.

[0012] As an improvement of the above solution, it further includes: An extrusion ring. The connecting rod is provided with a liquid storage cavity. The extrusion ring is slidably connected to the connecting rod, and the extrusion ring is provided with a chute; A limiting rod, fixedly connected to the output shaft of the driving motor. The limiting rod slides in the chute of the extrusion ring. The third moving rod and the second moving rod together form a cavity, and the liquid storage cavity on the connecting rod is communicated with the cavity on the third moving rod through a hose.

[0013] As an improvement of the above solution, the chute on the extrusion ring is composed of a horizontal part and a vertical part, and the vertical part of the extrusion ring is located above its horizontal part.

[0014] As an improvement of the above solution, the fixing frame is provided with circumferentially distributed inclined surfaces for jointly shearing and crushing solid impurities when the cutting knife contacts the fixing frame.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: When the rotation resistance of the impeller increases, the first moving shell moves, thereby expanding the volume of the transfer cavity on the first fixed shell, expanding the activity space of impurities in the first fixed shell, enabling the impurities in the first fixed shell to be converted from a compact state to a loose state, so that the impurities in the first fixed shell can smoothly flow out from its sewage outlet under the action of the impeller, improving the operation efficiency of the entire system.

[0016] After the first moving shell moves downward, the flow path of sewage entering the transfer cavity on the second moving shell is changed, and the sewage is filtered by the flow holes on the second moving shell and the second fixed shell, reducing the volume of solid impurities entering the first fixed shell, so that the solid impurities in the first fixed shell can be smoothly discharged.

[0017] When the resistance received by the cutting knife during rotation increases, the position of the cutting knife is changed to move the cutting knife away from the solid impurities in contact with the intercepting plate, reduce the load on the output shaft of the driving motor, thereby extending the service life of the driving motor, and the cutting knife and the fixing frame jointly shear and crush the solid impurities away from the intercepting plate to ensure the normal use of the device. Description of the Drawings

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the present invention; Figure 2 It is a three-dimensional structural sectional view of the outer shell of the present invention; Figure 3 It is a three-dimensional structural sectional view of the oil seal shell and the first fixing shell of the present invention; Figure 4 It is a three-dimensional structural sectional view of the first moving shell of the present invention; Figure 5 It is a three-dimensional structural sectional view of the connecting shaft of the present invention; Figure 6 It is a three-dimensional structural sectional view of the second moving shell and the second fixing shell of the present invention; Figure 7 It is an exploded three-dimensional structure diagram of the first blocking block and the second blocking block of the present invention; Figure 8 It is a three-dimensional structural schematic diagram of the connecting rod and the second moving rod of the present invention; Figure 9 It is a three-dimensional structural sectional view of the connecting rod and the second moving rod of the present invention; Figure 10 It is a three-dimensional structural schematic diagram of the driving motor and the limiting rod of the present invention.

[0019] Names of the reference numerals in the drawings: 1. Outer shell, 2. Trash rack, 3. Oil seal shell, 31. Driving motor, 32. Connecting shaft, 33. First torsion spring, 4. First fixing shell, 5. First moving shell, 6. Impeller, 7. Liquid storage shell, 8. Moving block, 9. First moving rod, 10. Hydraulic telescopic rod, 11. Second moving shell, 12. Second fixing shell, 13. Fixing frame, 14. First blocking block, 15. Second blocking block, 16. Third blocking block, 17. Connecting column, 18. Driving ball, 19. Intercepting plate, 20. Connecting rod, 21. Second torsion spring, 22. Second moving rod, 221. Positioning rod, 23. Third moving rod, 24. Cutting knife, 25. Extrusion ring, 26. Limiting rod. Detailed Embodiments

[0020] The above solution will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are for illustrating the present application and not for limiting the scope of the present application. The implementation conditions adopted in the embodiments can be further adjusted according to the conditions of specific manufacturers, and the implementation conditions not specified are usually those in conventional experiments.

[0021] An anti-blocking submersible pump, as Figures 1 - 5 shown, includes: a housing 1, a trash rack 2 is fixedly connected to the housing 1, and an oil seal housing 3 is fixedly connected to the lower side of the housing 1; a drive motor 31, fixedly connected inside the housing 1, the oil seal housing 3 is rotatably connected through a connecting shaft 32, and a first torsion spring 33 is fixedly connected between the output shaft of the drive motor 31 and the connecting shaft 32; a first fixed housing 4, fixedly connected to the lower side of the oil seal housing 3, the connecting shaft 32 is rotatably connected to the first fixed housing 4, and the first fixed housing 4 is provided with a sewage discharge port; a first moving housing 5, slidably connected to the first fixed housing 4, the connecting shaft 32 is fixedly connected with an impeller 6, and the impeller 6 rotates inside the first fixed housing 4; a trigger assembly, arranged on the connecting shaft 32, and the trigger assembly is used to change the position of the first moving housing 5 when the resistance of the impeller 6 to rotate increases, so as to change the volume between the first fixed housing 4 and the first moving housing 5.

[0022] In the above solution, the trash rack 2 is used to intercept large-volume impurities in the sewage; hydraulic oil is stored in the oil seal housing 3; the torsion force of the first torsion spring 33 is greater than the resistance when the drive motor 31 drives the impeller 6 to rotate idly through the connecting shaft 32; the sewage discharge port on the first fixed housing 4 is located on its right side; the first moving housing 5 and the first fixed housing 4 jointly form a transfer cavity for accommodating the impeller 6, the first moving housing 5 is provided with a through hole, and the diameter of the through hole of the first moving housing 5 is smaller than the outer diameter of the impeller 6.

[0023] The specific working process of the above solution is as follows: When it is necessary to use this device to pump sewage, the staff places this device at the designated position, and then starts the drive motor 31. The output shaft of the drive motor 31 drives the connecting shaft 32 to rotate with the help of the first torsion spring 33, and the connecting shaft 32 drives the impeller 6 to rotate at a high speed. The sewage is sucked into the transfer cavity on the first fixed housing 4 by the suction force generated by the high-speed rotation of the impeller 6, and at the same time, the sewage is discharged from the sewage discharge port of the first fixed housing 4 by the centrifugal force generated by the high-speed rotation of the impeller 6.

[0024] During the process of the device extracting sewage, due to the large amount of impurities contained in the sewage, there is a risk of blockage of the device. During the process of the above-mentioned connecting shaft 32 driving the impeller 6 to rotate, when a large amount of impurities accumulate in the transfer cavity on the first fixed shell 4, the resistance to the rotation of the impeller 6 increases, causing the resistance of the output shaft of the driving motor 31 to drive the connecting shaft 32 to rotate through the first torsion spring 33 to increase synchronously. As a result, the output shaft of the driving motor 31 and the connecting shaft 32 rotate relatively, causing the first torsion spring 33 to twist and store energy. When the resistance to the rotation of the impeller 6 reaches a threshold value (corresponding to the threshold value of the energy storage of the first torsion spring 33), the triggering assembly works, causing the first moving shell 5 to move downward, thereby expanding the volume of the transfer cavity on the first fixed shell 4, expanding the activity space of the impurities in the first fixed shell 4, enabling the impurities in the first fixed shell 4 to be converted from a compact state to a loose state, so that the impurities in the first fixed shell 4 can flow smoothly out of its sewage outlet under the action of the impeller 6, improving the operating efficiency of the entire system.

[0025] During the process of the impurities accumulated in the above-mentioned first fixed shell 4 flowing out, the resistance to the rotation of the impeller 6 gradually decreases, causing the first torsion spring 33 to release the stored energy, and driving the impeller 6 to gradually reset relative to the output shaft of the driving motor 31 through the connecting shaft 32. At the same time, the triggering assembly drives the first moving shell 5 to move upward, restoring the initial volume of the transfer cavity on the first fixed shell 4 and continuing to transport sewage.

[0026] Until after using the device for a preset duration, the staff shuts down the driving motor 31, removes the device from the sewage, and cleans the device at the same time for subsequent use.

[0027] As Figures 2 - 4 shown, the triggering assembly includes: a liquid storage shell 7, fixedly connected to the connecting shaft 32. A moving ring is slidably connected inside the liquid storage shell 7, and a first spring is fixedly connected between the liquid storage shell 7 and the moving ring inside it; a moving block 8, fixedly connected to the moving ring inside the liquid storage shell 7; a first moving rod 9, fixedly connected to the output shaft of the driving motor 31, and the first moving rod 9 is used to squeeze the moving block 8; a hydraulic telescopic rod 10, fixedly connected to the first fixed shell 4, and the telescopic end of the hydraulic telescopic rod 10 is fixedly connected to the first moving shell 5, and the fixed part of the hydraulic telescopic rod 10 is communicated with the liquid storage shell 7 through a hose.

[0028] In the above solution, hydraulic oil is stored both inside the liquid storage shell 7 and in the hose between the fixed part of the liquid storage shell 7 and the hydraulic telescopic rod 10; the first spring inside the liquid storage shell 7 is already in a state of storing energy initially, and the first moving rod 9 does not contact the moving block 8 initially; a damping can be set between the fixed part and the telescopic part of the hydraulic telescopic rod 10 to reduce the moving speed of the telescopic part of the hydraulic telescopic rod 10.

[0029] As Figure 4As shown, the moving block 8 is provided with an inclined surface having an inclination angle less than 45°, which is used to reduce the resistance suffered by the first moving rod 9 when driving the moving block 8 to move downward synchronously during the movement. The height of the moving block 8 is greater than the maximum distance that the moving ring in the liquid storage shell 7 moves therein, so that when the moving block 8 moves downward to the limit position, the inclined surface of the moving block 8 is still in contact with the first moving rod 9.

[0030] The specific working process of the above solution is as follows: During the relative rotation of the output shaft of the driving motor 31 and the connecting shaft 32, the connecting shaft 32 drives the liquid storage shell 7 and other parts connected thereto to move synchronously, so that the distance between the first moving rod 9 and the moving block 8 gradually decreases. When it is necessary to trigger the component to work, the first moving rod 9 has already contacted the inclined surface of the moving block 8. During the subsequent continuous relative rotation of the output shaft of the driving motor 31 and the connecting shaft 32, the first moving rod 9 presses the moving block 8, causing the moving block 8 to drive the moving ring on the liquid storage shell 7 to move downward, forcing the hydraulic oil in the liquid storage shell 7 to enter the fixed part of the hydraulic telescopic rod 10 through the hose, so that the telescopic end of the hydraulic telescopic rod 10 drives the first moving shell 5 to move downward, thereby increasing the volume of the transfer cavity on the first fixed shell 4.

[0031] During the process of the first torsion spring 33 driving the impeller 6 to reset relative to the output shaft of the driving motor 31, the connecting shaft 32 drives the liquid storage shell 7 to move synchronously, so that the first moving rod 9 and the moving block 8 gradually lose contact, so that the moving ring in the liquid storage shell 7 gradually resets upward under the action of the first spring therein, pumping the hydraulic oil transported to the fixed part of the hydraulic telescopic rod 10 back into the liquid storage shell 7, so that the first moving shell 5 resets upward.

[0032] As Figures 2 - 7 shown, it further includes: a flow path switching mechanism, which is arranged on the first moving shell 5. The flow path switching mechanism is used to change the volume of impurities entering the first fixed shell 4 by changing the flow path of sewage entering the first fixed shell 4 after the first moving shell 5 moves downward. The flow path switching mechanism includes: a second moving shell 11, fixedly connected to the lower side of the first moving shell 5; a second fixed shell 12, fixedly connected to the trash rack 2. The second fixed shell 12 is slidably connected to the second moving shell 11, and a plurality of flow holes are provided on both of them; a fixing frame 13, fixedly connected to the second moving shell 11; a first plugging block 14, fixedly connected to the second fixed shell 12. The first plugging block 14 is connected to a second plugging block 15 in a limited rotation manner. The second plugging block 15 is connected to a third plugging block 16 in a limited rotation manner. The third plugging block 16 is fixedly connected with a connecting column 17. The connecting column 17 is provided with a limiting groove. The connecting column 17 passes through the fixing frame 13 and is slidably connected thereto; a driving ball 18, fixedly connected to the fixing frame 13. The limiting groove on the connecting column 17 is used for the driving ball 18 to move.

[0033] In the above solution, the inner diameter of the second fixed housing 12 is equal to the outer diameter of the second moving housing 11, and the through hole of the second moving housing 11 communicates with the through hole of the first moving housing 5; the second fixed housing 12 and the second moving housing 11 are slid to align or misalign the flow holes on the two, and the flow area of the flow holes on the two is specifically selected by the staff according to the actual situation; the fixing frame 13 is located below the second moving housing 11; the first blocking block 14 is located below the second fixed housing 12; the first blocking block 14, the second blocking block 15 and the third blocking block 16 are arranged in sequence from bottom to top, and damping is provided at the rotational connection between the first blocking block 14 and the second blocking block 15 and between the second blocking block 15 and the third blocking block 16, so that the first blocking block 14 and the second blocking block 15 and the second blocking block 15 and the third blocking block 16 cannot rotate under the impact of water flow. Initially, the first blocking block 14, the second blocking block 15 and the third blocking block 16 coincide with each other, and the three have the same shape and their projections on the horizontal plane coincide; initially, the driving ball 18 is not located in the limiting groove of the connecting column 17.

[0034] As Figure 6 and Figure 7 shown, the first blocking block 14, the second blocking block 15 and the third blocking block 16 are each composed of two symmetrically distributed sector blocks, and the central angles of the sector blocks of the three are not less than 60°. The maximum rotation angle of the first blocking block 14 relative to the second blocking block 15 and the maximum rotation angle of the second blocking block 15 relative to the third blocking block 16 are both equal to 60°, ensuring that the disk formed after the three rotate can completely block the through hole on the lower side of the second fixed housing 12.

[0035] As Figure 7 shown, the limiting groove on the connecting column 17 is composed of a vertical part and an arc part, and the central angle corresponding to the projection of the arc part of the limiting groove of the connecting column 17 on the horizontal plane is equal to 120°. The vertical part of the limiting groove of the connecting column 17 is located above its arc part.

[0036] The specific working process of the above solution is as follows: During the downward movement of the first moving shell 5, the first moving shell 5 drives the fixing frame 13 to move downward synchronously through the second moving shell 11. After the fixing frame 13 contacts the connecting column 17, as the fixing frame 13 continues to move downward, the driving ball 18 enters the vertical part of the limiting groove of the connecting column 17 and moves downward along it. When the driving ball 18 moves downward to the junction of the vertical part and the arc part of the limiting groove of the connecting column 17, the driving ball 18 continues to move downward along the arc part of the limiting groove of the connecting column 17 and squeezes the connecting column 17, causing the connecting column 17 to drive the third blocking block 16 to rotate synchronously. Until after the third blocking block 16 rotates 60°, the third blocking block 16 drives the second blocking block 15 to rotate. Until after the second blocking block 15 rotates 60°, the first moving shell 5 moves downward to the limit position. At the same time, the fixing frame 13 moves downward to the position where it contacts the third blocking block 16. At this time, the first blocking block 14, the second blocking block 15, and the third blocking block 16 jointly form a complete disc and block the lower part of the second fixed shell 12, thereby preventing large-volume solid impurities from entering the second fixed shell 12.

[0037] After the first moving shell 5 stops moving downward, some of the flow holes on the second moving shell 11 communicate with some of the flow holes on the second fixed shell 12, allowing sewage to enter the second moving shell 11 through the flow holes on both of them and then enter the first fixed shell 4. Thus, the sewage is filtered through the flow holes on both of them, reducing the volume of solid impurities entering the first fixed shell 4 and enabling the solid impurities accumulated in the first fixed shell 4 to be smoothly discharged.

[0038] During the upward movement of the first moving shell 5, the first moving shell 5 drives the fixing frame 13 to move upward synchronously through the second moving shell 11, thereby first driving the third blocking block 16 to rotate in the reverse direction. After the third blocking block 16 rotates 60° in the reverse direction, the third blocking block 16 drives the second blocking block 15 to reset to the initial position synchronously for subsequent use.

[0039] As Figures 3 - 6 、 Figure 8 and Figure 10As shown in the figure, it further includes: an intercepting plate 19, fixedly connected inside the second moving shell 11, and the intercepting plate 19 is provided with a through hole; a connecting rod 20, the connecting shaft 32 is provided with a through hole, the connecting rod 20 is rotatably connected inside the through hole of the connecting shaft 32, and a second torsion spring 21 is fixedly connected between the connecting rod 20 and the output shaft of the driving motor 31; a second moving rod 22, slidably connected to the connecting rod 20, the connecting shaft 32 is slidably connected with a positioning rod 221, the second moving rod 22 is rotatably connected to the positioning rod 221, the first moving shell 5 is fixedly connected with a connecting frame, and the first moving shell 5 is rotatably connected to the positioning rod 221 through the connecting frame thereon; a third moving rod 23, slidably connected to the second moving rod 22, and a second spring is fixedly connected between the third moving rod 23 and the second moving rod 22; a cutting knife 24, fixedly connected to the lower end of the third moving rod 23, the cutting knife 24 is attached to the lower side of the intercepting plate 19, and the connecting column 17 is used to squeeze the cutting knife 24.

[0040] In the above solution, the intercepting plate 19 is located on the upper side inside the second moving shell 11 and is used to intercept solid impurities in the sewage; the second torsion spring 21 is located on the upper side of the connecting rod 20, and the second torsion spring 21 is used to detect the resistance suffered by the connecting rod 20 during rotation; initially, the second spring between the third moving rod 23 and the second moving rod 22 has been charged to the maximum state; the cutting knife 24 and the intercepting plate 19 jointly shear and crush the solid impurities intercepted by the intercepting plate 19, so that the solid impurities can enter the first fixed shell 4.

[0041] As Figures 8 - 10 shown in the figure, it further includes: an extrusion ring 25, the connecting rod 20 is provided with a liquid storage cavity, the extrusion ring 25 is slidably connected to the connecting rod 20, and the extrusion ring 25 is provided with a chute; a limiting rod 26, fixedly connected to the output shaft of the driving motor 31, the limiting rod 26 slides in the chute of the extrusion ring 25, the third moving rod 23 and the second moving rod 22 jointly form a cavity, and the liquid storage cavity on the connecting rod 20 is communicated with the cavity on the third moving rod 23 through a hose.

[0042] In the above solution, hydraulic oil is stored in the liquid storage cavity of the connecting rod 20, in the hose on the connecting rod 20, and in the cavity of the third moving rod 23.

[0043] As Figure 8 shown in the figure, the chute on the extrusion ring 25 is composed of a horizontal part and a vertical part, the vertical part of the extrusion ring 25 is located above its horizontal part, and initially the limiting rod 26 is located in the horizontal part of the chute on the extrusion ring 25, limiting the extrusion ring 25 at the uppermost position.

[0044] As Figure 5 and Figure 6As shown, the fixing frame 13 is provided with circumferentially distributed inclined surfaces for increasing the shear force generated between the cutting blade 24 and the upper side of the fixing frame 13 when the cutting blade 24 contacts the upper side of the fixing frame 13 , so that the cutting blade 24 and the fixing frame 13 can shear and crush the solid impurities together when they contact.

[0045] The specific workflow of the above scheme is as follows: In the process of the impeller 6 sucking the external sewage into the first fixed shell 4, the solid impurities contained in the sewage entering the second movable shell 11 are intercepted by the interception plate 19. In the process of the output shaft of the driving motor 31 driving the connecting shaft 32 to rotate at a high speed through the first torsion spring 33, the output shaft of the driving motor 31 drives the connecting rod 20 to rotate at a high speed through the second torsion spring 21, and the connecting rod 20 drives the second movable rod 22, the third movable rod 23 and the cutting knife 24 to rotate synchronously at a high speed. The solid impurities intercepted by the interception plate 19 are sheared and crushed by the joint action of the cutting knife 24 and the interception plate 19, thereby reducing the volume of the solid impurities, so that the solid impurities can enter the first fixed shell 4 with the water flow through the through holes on the interception plate 19, and be discharged from the first fixed shell 4 with the water flow.

[0046] During the downward movement of the first movable shell 5, the first movable shell 5 drives the intercepting plate 19 to move downward and drives the positioning rod 221 to move downward synchronously through the connecting frame thereon. The positioning rod 221 drives the second movable rod 22 to move downward. The second movable rod 22 drives the third movable rod 23 to move downward through the spring thereon. The third movable rod 23 drives the cutting knife 24 to move downward, so that the cutting knife 24 is always in contact with the intercepting plate 19, thereby ensuring that there is a good shear force between the two.

[0047] During the process of shearing and crushing solid impurities by the cutting knife 24, when the solid impurities are objects with high hardness such as metal, the cutting knife 24 cannot crush such impurities, resulting in an increase in the resistance to the rotation of the cutting knife 24, and the resistance to the rotation of the connecting rod 20 increases synchronously, thereby causing the second torsion spring 21 to be twisted and accumulate force, and the connecting rod 20 and the output shaft of the drive motor 31 to rotate relative to each other.

[0048] During the relative rotation between the connecting rod 20 and the output shaft of the driving motor 31, the output shaft of the driving motor 31 drives the limiting rod 26 thereon to move along the horizontal portion of the slide groove on the extrusion ring 25. When the limiting rod 26 moves to the junction of the horizontal portion and the vertical portion of the slide groove on the extrusion ring 25, the limiting rod 26 no longer limits the extrusion ring 25. At this time, the third moving rod 23 moves downward under the action of the second spring thereon, thereby causing the extrusion ring 25 to move downward synchronously under the drive of the hydraulic oil. During the downward movement, the third moving rod 23 drives the cutting knife 24 to move downward synchronously, so that the cutting knife 24 is away from the solid impurities in contact with the intercepting plate 19, thereby reducing the load on the output shaft of the driving motor 31 and extending the service life of the driving motor 31.

[0049] During the downward movement of the extrusion ring 25, the limit rod 26 is located in the vertical part of the slide groove on the extrusion ring 25. When the extrusion ring 25 loses contact with the limit rod 26, the extrusion ring 25 can continue to move downward. At the same time, during the downward movement of the extrusion ring 25, the cutting knife 24 gradually loses contact with the solid impurities, so that the resistance of the cutting knife 24 is gradually reduced, and then the second torsion spring 21 drives the connecting rod 20, the second moving rod 22 and the third moving rod 23 to rotate synchronously, so that the output shaft of the drive motor 31 and the connecting rod 20 rotate at the same frequency again.

[0050] When the cutting knife 24 moves downward to a position in contact with the upper side of the fixing frame 13, the cutting knife 24 stops moving downward. At this time, the cutting knife 24 cooperates with the fixing frame 13 during the rotation to shear and crush the solid impurities away from the intercepting plate 19, thereby ensuring the normal use of the device. At the same time, when the cutting knife 24 moves downward to the extreme position, the second spring on the third moving rod 23 is still in a compressed state, thereby increasing the stability of the position of the cutting knife 24.

[0051] After the cutting knife 24 moves downward to the extreme position compared to the second moving rod 22, when the second moving shell 11 moves downward, the cutting knife 24 is squeezed upward by the connecting column 17, and the second spring between the third moving rod 23 and the second moving rod 22 is compressed and stored, so that the cutting knife 24 loses contact with the fixed frame 13. During this process, the first blocking block 14, the second blocking block 15 and the third blocking block 16 gradually block the lower port on the second fixed shell 12, reducing the flow area of ​​the lower port of the second fixed shell 12, thereby reducing the volume of solid impurities entering the second fixed shell 12.

[0052] After the cutting knife 24 moves downward to the extreme position compared to the second moving rod 22 and the second moving shell 11 moves downward to the extreme position, when the second moving shell 11 moves upward, the pressure on the second spring between the third moving rod 23 and the second moving rod 22 gradually decreases, so that the cutting knife 24 continues to contact the upper side of the connecting column 17 under the action of the second spring on the third moving rod 23 until the cutting knife 24 contacts the upper side of the fixed frame 13 again. In the process of the second moving shell 11 continuing to move upward, the cutting knife 24 separates from the connecting column 17, and the cutting knife 24 and the fixed frame 13 again jointly shear and crush the solid impurities.

[0053] After the device is used, the staff will inspect and maintain the device and manually reset the cutting knife 24 and the squeezing ring 25 to prepare for the subsequent use of the device to extract sewage.

[0054] As described above, it is only the preferred specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application, according to the technical solution of the present application and its improved concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present application.

Claims

1. An anti-blocking submersible sewage pump, characterized in that: include: An outer shell (1), the outer shell (1) being fixedly connected to a dirt retaining frame (2), and an oil seal shell (3) being fixedly connected to the lower side of the outer shell (1); A drive motor (31) is fixedly connected in the housing (1); a connecting shaft (32) is rotatably connected through the oil seal housing (3); a first torsion spring (33) is fixedly connected between the output shaft of the drive motor (31) and the connecting shaft (32); A first fixed shell (4) is fixedly connected to the lower side of the oil seal shell (3), the connecting shaft (32) is rotatably connected to the first fixed shell (4), and the first fixed shell (4) is provided with a sewage outlet; A first movable shell (5) is slidably connected to the first fixed shell (4); the connecting shaft (32) is fixedly connected to an impeller (6); and the impeller (6) rotates inside the first fixed shell (4); A trigger assembly is arranged on the connecting shaft (32), and is used to change the volume between the first fixed shell (4) and the first movable shell (5) by changing the position of the first movable shell (5) when the resistance to the rotation of the impeller (6) increases.

2. The anti-blocking submersible sewage pump according to claim 1 is characterized in that: The trigger component comprises: A liquid storage shell (7) is fixedly connected to the connecting shaft (32), a movable ring is slidably connected inside the liquid storage shell (7), and a first spring is fixedly connected between the liquid storage shell (7) and the movable ring inside the liquid storage shell (7); A moving block (8) fixedly connected to a moving ring in the liquid storage shell (7); A first moving rod (9) fixedly connected to the output shaft of the driving motor (31), the first moving rod (9) being used to squeeze the moving block (8); A hydraulic telescopic rod (10) is fixedly connected to the first fixed shell (4), a telescopic end of the hydraulic telescopic rod (10) is fixedly connected to the first movable shell (5), and a fixed portion of the hydraulic telescopic rod (10) is connected to the liquid storage shell (7) via a hose.

3. The anti-blocking submersible sewage pump according to claim 2 is characterized in that: The moving block (8) is provided with an inclined surface, and the height of the moving block (8) is greater than the maximum distance that the moving ring in the liquid storage shell (7) moves therein.

4. The anti-blocking submersible sewage pump according to claim 2 is characterized in that include: A flow channel switching mechanism is arranged on the first movable shell (5), and is used to change the volume of impurities entering the first fixed shell (4) by changing the flow path of sewage entering the first fixed shell (4) after the first movable shell (5) moves downward. The flow channel switching mechanism comprises: A second movable shell (11) fixedly connected to the lower side of the first movable shell (5); A second fixed shell (12) is fixedly connected to the trash-blocking frame (2); the second fixed shell (12) is slidably connected to the second movable shell (11), and both are provided with a plurality of flow holes; A fixed frame (13) fixedly connected to the second movable shell (11); A first blocking block (14) is fixedly connected to the second fixed shell (12); the first blocking block (14) is connected to the second blocking block (15) in a limited rotation manner; the second blocking block (15) is connected to the third blocking block (16) in a limited rotation manner; the third blocking block (16) is fixedly connected to a connecting column (17); the connecting column (17) is provided with a limiting groove; the connecting column (17) passes through the fixing frame (13) and is slidably connected thereto; The driving ball (18) is fixedly connected to the fixing frame (13), and the limiting groove on the connecting column (17) is used to allow the driving ball (18) to move.

5. The anti-blocking submersible sewage pump according to claim 4 is characterized in that: The first blocking block (14), the second blocking block (15) and the third blocking block (16) are each composed of two symmetrically distributed sector blocks, and the central angles of the three sector blocks are not less than 60°, and the maximum rotation angle of the first blocking block (14) on the second blocking block (15) and the maximum rotation angle of the second blocking block (15) on the third blocking block (16) are both equal to 60°.

6. The anti-blocking submersible sewage pump according to claim 4 is characterized in that: The limiting groove on the connecting column (17) consists of a vertical portion and an arc-shaped portion, and the angle of the central angle corresponding to the projection of the arc-shaped portion of the limiting groove of the connecting column (17) on a horizontal plane is equal to 120°, and the vertical portion of the limiting groove of the connecting column (17) is located on the upper side of its arc-shaped portion.

7. The anti-blocking submersible sewage pump according to claim 4 is characterized in that include: An interception plate (19) is fixedly connected to the second movable shell (11), and the interception plate (19) is provided with a through hole; A connecting rod (20), the connecting shaft (32) being provided with a through hole, the connecting rod (20) being rotatably connected in the through hole of the connecting shaft (32), and a second torsion spring (21) being fixedly connected between the connecting rod (20) and the output shaft of the drive motor (31); A second movable rod (22) is slidably connected to the connecting rod (20); the connecting shaft (32) is slidably connected to a positioning rod (221); the second movable rod (22) is rotatably connected to the positioning rod (221); the first movable shell (5) is fixedly connected to a connecting frame; the first movable shell (5) is rotatably connected to the positioning rod (221) via the connecting frame thereon; A third moving rod (23) is slidably connected to the second moving rod (22), and a second spring is fixedly connected between the third moving rod (23) and the second moving rod (22); The cutting knife (24) is fixedly connected to the lower end of the third moving rod (23), the cutting knife (24) is in contact with the lower side of the intercepting plate (19), and the connecting column (17) is used to squeeze the cutting knife (24).

8. The anti-blocking submersible sewage pump according to claim 7 is characterized in that include: An extrusion ring (25), the connecting rod (20) being provided with a liquid storage cavity, the extrusion ring (25) being slidably connected to the connecting rod (20), and the extrusion ring (25) being provided with a sliding groove; The limiting rod (26) is fixedly connected to the output shaft of the driving motor (31), and the limiting rod (26) slides in the slide groove of the extrusion ring (25). The third moving rod (23) and the second moving rod (22) together form a cavity. The liquid storage cavity on the connecting rod (20) is connected to the cavity on the third moving rod (23) through a hose.

9. The anti-blocking submersible sewage pump according to claim 8 is characterized in that: The slide groove on the extrusion ring (25) consists of a horizontal portion and a vertical portion, and the vertical portion of the extrusion ring (25) is located on the upper side of the horizontal portion.

10. The anti-blocking submersible sewage pump according to claim 8, characterized in that: The fixing frame (13) is provided with circumferentially distributed inclined surfaces, which are used to shear and crush solid impurities when the cutting blade (24) contacts the fixing frame (13).

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