An adjustable wear-resistant and corrosion-resistant sewage pump

Abstract

The invention discloses an adjustable wear-resistant and corrosion-resistant sewage pump, which relates to the technical field of sewage pumps, and includes a motor and an impeller. The motor includes a motor housing, a rotor and a stator winding, the rotor and the stator winding are located in the motor housing, the rotor is provided with a rotor shaft, the lower end of the rotor shaft is detachably connected to the impeller, and also includes a water pressure chamber, a lower pump cover and a plurality of adjustment screws. The water pressure chamber is a flat barrel structure, and a center hole is provided at the center of the bottom surface. The water pressure chamber is detachably connected to the bottom of the motor housing, the impeller is arranged in the water pressure chamber, and the bottom extends out of the center hole, the lower pump cover is arranged below the impeller, the upper surface of the lower pump cover is a concave structure, the bottom of the impeller is located in the concave structure, and a plurality of adjustment screws are arranged between the water pressure chamber and the lower pump cover at intervals. The invention adopts an adjustable lower pump cover structure to ensure the working gap between the impeller and the lower pump cover, and is convenient to adjust, simple in structure, long in service life, good in sealing performance, and high in safety performance.

Description

Technical Field

[0001] The invention relates to the technical field of sewage pumps, in particular to an adjustable wear-resistant and corrosion-resistant sewage pump. Background Art

[0002] A sewage pump is a pump that is connected to a motor and is used to transport a solid-liquid mixture containing solid particles, fibers, etc. The sewage pump can tear and cut off long fibers, woven bags, water plants, cloth strips and other materials in the sewage, and then discharge them smoothly. With the continuous development and progress of urban construction and environmental protection, the application of sewage pumps is becoming more and more extensive. In industrial sectors such as coal mines, metallurgy, and electric power, or in places with gas and flammable and explosive materials, sewage pumps are used to transport mixed sewage containing suspended solid particles such as silt, coal slag, and fibers, or liquids with certain corrosive properties. The impeller is in a harsh working environment for a long time and is easily worn and damaged. In severe cases, the impeller will break, leading to safety accidents. Moreover, the impeller may be worn and sealed due to poor sealing or long-term use during operation, causing sewage and other liquids to enter the sewage pump motor, causing certain damage to the sewage pump and affecting the normal use of the sewage pump. This places higher requirements on the service life, operating efficiency, safety and reliability of the sewage pump, requiring the sewage pump to be resistant to the abrasion of solid phases and corrosion resistance. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an adjustable wear-resistant and corrosion-resistant sewage pump with adjustable structure, long service life, good sealing effect, high safety and simple structure.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0005] An adjustable wear-resistant and corrosion-resistant sewage pump comprises a motor and an impeller. The motor comprises a motor housing, a rotor and a stator winding. The rotor and the stator winding are located in the motor housing. The rotor is provided with a rotor shaft. The lower end of the rotor shaft is detachably connected to the impeller. The pump also comprises a water pressure chamber, a lower pump cover and a plurality of adjustment screws. The water pressure chamber is a flat barrel structure and a center hole is provided at the center of the bottom surface. The water pressure chamber is detachably connected to the bottom of the motor housing. The impeller is arranged in the water pressure chamber and the bottom extends out of the center hole. The lower pump cover is arranged below the impeller. The upper surface of the lower pump cover is a concave structure. The bottom of the impeller is located in the concave structure. A plurality of adjustment screws are arranged at intervals between the water pressure chamber and the lower pump cover and are used to adjust the distance between the water pressure chamber and the lower pump cover.

[0006] With the above structure, the impeller is located inside the water pressure chamber, which greatly improves the sewage passing capacity. The impeller and the lower pump cover adopt mutually matching appearance structures to ensure that the working gap between the lower pump cover and the impeller is uniform. The lower pump cover is connected to the water pressure chamber through an adjusting screw. The increase in the working gap due to impeller wear can be eliminated by adjusting the installation position of the lower pump cover on the adjusting screw, thereby ensuring the working efficiency of the impeller and extending the service life of the sewage pump.

[0007] Preferably, a plurality of threaded blind holes are evenly arranged along the circumference on the bottom plane of the water pressure chamber, a flange is arranged on the lower surface of the lower pump cover, a plurality of mounting holes are arranged on the flange, an adjusting screw passes through the mounting hole and is screwed into the threaded blind hole, and an adjusting nut is arranged on the upper and lower surfaces of the flange on the adjusting screw, respectively. The adjustment method of the adjusting screw and the double nut is adopted, and the adjustment is convenient and simple.

[0008] Preferably, the impeller includes an integrally formed impeller body and a plurality of blades, one side of the impeller body is a frustum protruding, and the other side is a conical groove, and the plurality of blades are evenly and protrudingly arranged on the protruding side of the impeller body, and the blades are distributed in a clockwise arc along the center of the impeller body, and a flow channel is formed between adjacent blades. The integrally formed impeller is used to ensure the strength of the impeller, and the overall frustum-shaped structure and arc-shaped blade arrangement can effectively reduce water flow resistance, reduce blade load, reduce water flow turbulence, work smoothly, and improve the working efficiency of the impeller.

[0009] Preferably, the concave structure of the lower pump cover matches the convex protrusion of the impeller cone, the surface of the concave structure is coated with nitrile rubber, and the inner side of the water pressure chamber is coated with nitrile rubber. The wear resistance and corrosion resistance of the lower pump cover and the water pressure chamber are improved by coating with nitrile rubber.

[0010] Preferably, an upper bearing seat is detachably connected to the upper part of the motor housing, and a lower bearing seat is detachably connected to the lower part of the motor housing, and the rotor shaft is mounted on the upper bearing seat and the lower bearing seat through bearings. The bearings can make the rotor shaft move smoothly, reduce the friction of the rotor shaft, and extend the service life. The upper bearing seat and the lower bearing seat isolate the motor from the outside world, forming an independent closed space to ensure the safety of the motor.

[0011] Preferably, an inner lining plate is provided between the lower bearing seat and the water pressure chamber. The inner lining plate is located above the impeller. The inner lining plate is a stainless steel-coated nitrile rubber structure, which enhances the wear resistance and corrosion resistance of the inner lining plate and ensures the sealing reliability between the lower bearing seat and the water pressure chamber.

[0012] Preferably, the pump further comprises a base, which is fixed to the lower end of the motor housing by a plurality of base bolts, and is a stainless steel barrel structure, with a plurality of evenly distributed filter holes arranged on the circumferential surface of the base, and a partition plate arranged on the inner bottom surface of the base. The barrel-shaped base is integrally mounted on the outside of the pressure chamber, the impeller and the lower pump cover, and the filter holes on the circumferential surface of the base can effectively isolate large impurities in the sewage, and the partition plate inside the base can prevent the water flow in the base from forming vortices, thereby ensuring the working efficiency of the sewage pump.

[0013] Preferably, a plurality of through holes are evenly distributed along the circumference on the bottom plane of the water pressure chamber, the through holes and the threaded blind holes are staggered and cross-arranged, the number of through holes and the number of threaded blind holes are the same, and the base bolts connect the base from bottom to top through the through holes to connect the water pressure chamber and the motor housing. The water pressure chamber and the base can be installed at the same time by using the base bolts, and the staggered and cross-arranged installation holes can avoid interference during installation.

[0014] Preferably, a thermal element is arranged inside the stator winding, a terminal is arranged in the upper cavity of the upper bearing seat, and the thermal element is electrically connected to the terminal. The thermal element is used to monitor the working temperature of the motor to ensure the safety of the motor.

[0015] Preferably, a guide cover is detachably connected to the outside of the motor housing, and a water outlet pipe is detachably connected to the guide cover. The cavity between the motor housing and the guide cover is used to gather the water flow, ensuring that the water flow can be effectively discharged from the water outlet pipe.

[0016] In conclusion, the present invention adopts an adjustable lower pump cover structure to ensure the working clearance between the impeller and the lower pump cover, which is convenient to adjust, simple in structure, long in service life, good in sealing and high in safety performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention;

[0018] Figure 2 For the present invention Figure 1 A magnified image of point A;

[0019] Figure 3 This is a schematic diagram of the impeller structure of the present invention;

[0020] Figure 4 It is a schematic diagram of the base structure of the present invention.

[0021] In the figure: 1. adjusting nut; 2. adjusting screw; 3. base; 4. lower pump cover; 5. impeller; 6. inner lining plate; 7. base bolt; 8. water pressure chamber; 9. mechanical seal; 10. lower bearing seat; 11. bearing; 12. water outlet pipe; 13. thermal element; 14. handle; 15. upper bearing seat; 16. terminal; 17. wiring chamber cover; 18. cable outlet pipe; 19. cable gland; 20. cable; 21. guide cover; 22. stator winding; 23. rotor; 24. rotor shaft; 25. motor housing; 26. drain screw; 27. mechanical seal seat; 28. filter hole; 29. ​​partition; 30. impeller body; 31. blades. DETAILED DESCRIPTION

[0022] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings.

[0023] Referring to the accompanying drawings, an adjustable wear-resistant and corrosion-resistant sewage pump includes a motor and an impeller 5. The motor includes a motor housing 25, a rotor 23 and a stator winding 22. The rotor 23 and the stator winding 22 are located inside the motor housing 25. A rotor shaft 24 is processed at the center of the rotor 23. An upper bearing seat 15 is fixed to the upper part of the motor housing 25 by bolts. A lower bearing seat 10 is fixed to the lower part of the motor housing 25 by bolts. O-rings are installed on the mating surfaces of the upper bearing seat 15, the lower bearing seat 10 and the motor housing 25. The rotor shaft 24 is installed on the upper bearing seat 15 and the lower bearing seat 10 through a bearing 11. The rotor shaft 24 passes through the lower bearing seat 10. The lower end of the rotor shaft 24 is detachably connected to the impeller 5. Keyways are processed on the impeller 5 and the rotor shaft 24. The impeller 5 and the rotor shaft 24 transmit power through a flat key and rotate as a whole.

[0024] It also includes a water pressure chamber 8, a lower pump cover 4 and multiple adjusting screws 2. The water pressure chamber 8 is processed into a flat barrel structure, and a center hole is processed at the center position of the bottom surface. The inner side of the water pressure chamber 8 is coated with nitrile rubber to improve the wear resistance and corrosion resistance of the water pressure chamber 8. The bottom plane of the water pressure chamber 8 is evenly processed with the same number of threaded blind holes and through holes along the circumference. The threaded blind holes and through holes are staggered and cross-arranged to avoid interference during assembly. The base bolts 7 pass through the through holes to fasten the water pressure chamber 8 to the motor housing 25. The impeller 5 is located in the water pressure chamber 8, and the bottom extends out of the center hole. The adjusting screw 2 is tightened in the threaded blind hole. The lower pump cover 4 is installed below the impeller 5. The upper surface of the lower pump cover 4 is processed into a concave structure, and the lower surface of the lower pump cover 4 is processed into a flange style. The flange is processed with multiple mounting holes. The adjusting screw 2 passes through the mounting hole and is fixed by two adjusting nuts 1 that are tightened on the adjusting screw 2 and located above and below the flange.

[0025] In the above structure, the inner side of the water pressure chamber 8 is coated with nitrile rubber to improve the wear resistance and corrosion resistance of the water pressure chamber 8. The lower pump cover 4 is mounted on the adjusting screw 2, and the installation position is determined by the upper and lower adjusting nuts 1 of the flange. After the impeller 5 is worn after working for a long time, the working gap between the impeller 5 and the lower pump cover 4 increases, causing the pump efficiency to decrease. At this time, the position of the lower pump cover 4 on the adjusting screw 2 can be fine-tuned by adjusting the nut 1 to eliminate the working gap increased due to the wear of the impeller 5, so that the working gap reaches the initial value of the pump, thereby improving the working efficiency of the pump and extending the service life of the pump. The use of the bearing 11 can make the rotor shaft 24 move smoothly, reduce the friction of the rotor shaft 24, and extend the service life of the rotor shaft 24. The O-ring is used for sealing to prevent water or water vapor from entering the motor and ensure the safety of the motor.

[0026] Referring to the accompanying drawings, the impeller 5 includes an integrally formed impeller body 30 and a plurality of blades 31. One side of the impeller body 30 is a frustum protrusion and the other side is a conical groove. The plurality of blades 31 are evenly and protrudingly arranged on the protruding side of the impeller body 30. The blades 31 are distributed in a clockwise arc shape along the center of the impeller body 30, and a flow channel is formed between adjacent blades 31. The frustum protrusion of the impeller 5 matches the concave structure on the upper surface of the lower pump cover 4. The surface of the concave structure is coated with nitrile rubber to improve the wear resistance and corrosion resistance of the lower pump cover 4. The impeller 5 is integrally formed to ensure the strength of the impeller 5. The overall frustum structure and the arrangement of the arc-shaped blades 31 can effectively reduce the water flow resistance, reduce the load of the blades 31, reduce the turbulence of the water flow, work smoothly, and improve the working efficiency of the impeller 5.

[0027] Referring to the accompanying drawings, an inner lining plate 6 is arranged between the lower bearing seat 10 and the water pressure chamber 8. The inner lining plate 6 is located above the impeller 5. The inner lining plate 6 is a stainless steel-coated nitrile rubber structure, which enhances the wear resistance and corrosion resistance of the inner lining plate 6 and ensures the sealing reliability between the lower bearing seat 10 and the water pressure chamber 8.

[0028] Referring to the accompanying drawings, the base 3 is fixed to the base bolt 7 by threads and is located at the lower end of the motor housing 25. The base 3 is used to place and support the pump as a whole. The base 3 is a stainless steel barrel structure. A plurality of evenly distributed filter holes 28 are arranged on the circumferential surface of the base 3, and a partition 29 is arranged on the inner bottom surface of the base 3. The barrel-shaped base 3 is integrally mounted on the outside of the water pressure chamber 8, the impeller 5 and the lower pump cover 4. The filter holes 28 on the circumferential surface of the base 3 can effectively isolate large impurities in the sewage. When the impeller 5 is working, the partition 29 inside the base 3 can prevent the water flow from forming vortices, thereby ensuring the working efficiency of the pump.

[0029] Referring to the accompanying drawings, the upper part of the upper bearing seat 15 is a cavity structure, in which a terminal 16 is installed. A wiring cavity cover 17, a cable lead-out tube 18 and a cable gland 19 are connected in sequence above the upper bearing seat 15. The wiring cavity cover 17 is fastened to the upper part of the upper bearing seat 15 by bolts, and the cable lead-out tube 18 is fixed to the upper part of the wiring cavity cover 17 by bolts. The cable gland 19 is sleeved inside the cable lead-out tube 18. The cable 20 passes through the wiring cavity cover 17, the cable lead-out tube 18 and the cable gland 19 and is connected to the terminal 16. A thermistor 13 is arranged inside the stator winding 22. The thermistor 13 is electrically connected to the terminal 16 for monitoring the working temperature of the motor and ensuring the safety of the motor.

[0030] Referring to the accompanying drawings, the motor housing 25 is detachably connected to a guide cover 21 on the outside, and a water outlet pipe 12 is detachably connected to the guide cover 21. The water outlet pipe 12 is connected to an external pipeline for discharging sewage. A handle 14 is installed on the upper bearing seat 15, and the handle 14 is fastened by threads to facilitate the lifting and transportation of the pump. The interior of the lower bearing seat 10 is processed into a cavity structure, and the cavity is used as a sealing oil chamber. Two mechanical seals 9 are used on the contact surface between the sealing oil chamber and the rotor shaft 24 to ensure the tightness of the seal and prevent leakage of the sealing oil chamber. The mechanical seal 9 is fixed by a mechanical seal seat 27 installed on the lower bearing seat 10. The motor housing 25 is symmetrically processed with oil filling and draining holes connected to the sealing oil chamber for filling lubricating oil into the sealing oil chamber. The oil filling and draining holes are connected to the oil draining screws 26 by threads.

[0031] It should be particularly noted that in the embodiments of the present invention, the adjusting nut 1, mechanical seal 9, bearing 11, thermistor 13, terminal 16, cable 20, stator winding 22, rotor 23, drain screw 26 and O-ring are all existing technologies.

[0032] In the description of this patent, it should be understood that the terms "upper", "lower", "inner", "outer", "center", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this patent and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this patent.

[0033] In this patent, unless otherwise clearly specified and limited, the terms "combination", "setting", "connection", "fixation", "tightness" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in this patent according to the specific circumstances.

[0034] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0035] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An adjustable wear-resistant and corrosion-resistant sewage pump, comprising a motor and an impeller (5), the motor comprising a motor housing (25), a rotor (23) and a stator winding (22), the rotor (23) and the stator winding (22) being located in the motor housing (25), the rotor (23) being provided with a rotor shaft (24), the lower end of the rotor shaft (24) being detachably connected to the impeller (5), characterized in that: It also comprises a water pressure chamber (8), a lower pump cover (4) and a plurality of adjusting screws (2), wherein the water pressure chamber (8) is a flat barrel structure and a center hole is arranged at the center of the bottom surface, the water pressure chamber (8) is detachably connected to the bottom of the motor housing (25), the impeller (5) is arranged in the water pressure chamber (8) and the bottom thereof protrudes out of the center hole, the lower pump cover (4) is arranged below the impeller (5), the upper surface of the lower pump cover (4) is a concave structure, the bottom of the impeller (5) is located in the concave structure, and a plurality of adjusting screws (2) are arranged at intervals between the water pressure chamber (8) and the lower pump cover (4) for adjusting the distance between the water pressure chamber (8) and the lower pump cover (4); A plurality of threaded blind holes are evenly arranged along the circumference of the bottom plane of the water pressure chamber (8); a flange is arranged on the lower surface of the lower pump cover (4); a plurality of mounting holes are arranged on the flange; the adjusting screw (2) passes through the mounting holes and is screwed into the threaded blind holes; an adjusting nut (1) is respectively arranged on the upper and lower surfaces of the flange on the adjusting screw (2); The impeller (5) comprises an integrally formed impeller body (30) and a plurality of blades (31); one side of the impeller body (30) is a frustum protrusion and the other side is a conical groove; the plurality of blades (31) are evenly and protrudingly arranged on the protruding side of the impeller body (30); the blades (31) are distributed in a clockwise arc-shaped divergent manner along the center of the impeller body (30); and flow channels are formed between adjacent blades (31); The concave structure of the lower pump cover (4) matches the conical protrusion of the impeller (5), the surface of the concave structure is coated with nitrile rubber, and the inner side of the water pressure chamber (8) is coated with nitrile rubber; It also comprises a base (3), the base (3) being fixed to the lower end of the motor housing (25) by means of a plurality of base bolts (7), the base (3) being a stainless steel cylindrical structure, a plurality of evenly distributed filter holes (28) being arranged on the circumferential surface of the base (3), and a partition plate (29) being arranged on the inner bottom surface of the base (3); A plurality of through holes are evenly distributed along the circumference of the bottom plane of the water pressure chamber (8), the through holes and the threaded blind holes are staggered and cross-arranged, the number of the through holes is the same as the number of the threaded blind holes, and the base bolts (7) connect the base (3) from bottom to top, pass through the through holes, and connect the water pressure chamber (8) and the motor housing (25); The motor housing (25) is detachably connected to a flow guide cover (21) on the outside, and the flow guide cover (21) is detachably connected to a water outlet pipe (12).

2. The adjustable wear-resistant and corrosion-resistant sewage pump according to claim 1 is characterized in that: An upper bearing seat (15) is detachably connected to the upper side of the motor housing (25), and a lower bearing seat (10) is detachably connected to the lower side of the motor housing (25); the rotor shaft (24) is mounted on the upper bearing seat (15) and the lower bearing seat (10) via a bearing (11).

3. The adjustable wear-resistant and corrosion-resistant sewage pump according to claim 2 is characterized in that: An inner lining plate (6) is provided between the lower bearing seat (10) and the water pressure chamber (8); the inner lining plate (6) is located above the impeller (5); and the inner lining plate (6) is a stainless steel-coated nitrile rubber structure.

4. The adjustable wear-resistant and corrosion-resistant sewage pump according to claim 2 is characterized in that: A thermal element (13) is arranged inside the stator winding (22), a connection terminal (16) is arranged in the upper cavity of the upper bearing seat (15), and the thermal element (13) is electrically connected to the connection terminal (16).

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