Permanent-magnet variable-frequency ultralight sewage drainage pump and impeller

Abstract

The invention relates to a permanent-magnet variable-frequency ultralight sewage drainage pump and an impeller, and the permanent-magnet variable-frequency ultralight sewage drainage pump comprises a shell, an impeller mounting structure, a driving motor and the impeller; the shell is coaxially connected with the impeller mounting structure; the driving motor and the shell are nested, and a rotating shaft of the driving motor penetrates through the shell and extends in the direction of the impeller mounting structure; the impeller is mounted in the impeller mounting structure; the impeller comprises an impeller main body and a first sand discharging blade arranged at one axial end of the impeller main body; the impeller blades are arranged in the circumferential direction of the impeller main body; the first desilting blade is arranged at the water inlet end of the impeller main body and extends from the middle position of the water inlet end to the edge position of the water inlet end; a plurality of first desilting blades are arranged at equal intervals in the circumferential direction of the water inlet end; a gap is formed between the first desilting blade and the end part of the shell or the first desilting blade is flush with the end part of the shell. The service life of the whole device in a sewage environment is effectively prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of water pumping equipment, and in particular to a permanent magnet variable frequency sewage ultra-light drainage pump and an impeller. Background Art

[0002] The permanent magnet variable frequency ultra-light drainage pump is a lightweight drainage equipment, which belongs to the submersible pump type. It has the characteristics of small size, light weight and large displacement. The product consists of rotating parts such as rotating impellers and rotors and non-rotating parts such as rectifiers and casings. The rotating impeller does work, combined with the rectifying effect of the rectifier, so that the water flow produces continuous and stable propulsion energy. It is usually used in reservoir flood discharge, urban water pumping, river water intake and other fields. With its strong practicality and large displacement, it can quickly complete various pumping and drainage operations under various working conditions.

[0003] Furthermore, as an emergency rescue pump, the permanent magnet variable frequency ultra-light drainage pump is often designed with an aluminum alloy shell to improve its portability and reduce the weight of the water pump. However, the aluminum alloy shell has low hardness and is not wear-resistant. It cannot be used for a long time in a sewage environment with a lot of sand and entanglements. Especially at the junction of the rotating parts and non-rotating parts of the water pump, it is the position most likely to be entangled by flocs and worn by sand. When the water pump is worn, it will greatly affect the performance of the water pump, causing the mechanical seal to fail, and even the motor to burn out due to water ingress, which seriously limits the service life of this type of water pump in the sewage environment.

[0004] In addition, the impeller structure of the permanent magnet variable frequency ultra-light drainage pump adopts a high-permeability axial flow impeller. Large debris can be discharged directly through the impeller flow channel, and it has strong sewage discharge capacity. However, due to the low hardness and poor wear resistance of the shell material, it cannot solve the damage to the shell and mechanical seal caused by entanglements and sand in the sewage. Summary of the invention

[0005] The object of the present invention is to provide a permanent magnet variable frequency sewage ultra-light drainage pump and an impeller.

[0006] To achieve the above-mentioned purpose, the present invention provides a permanent magnet variable frequency sewage ultra-light drainage pump, comprising: a housing, an impeller mounting structure, a driving motor and an impeller; The housing is coaxially connected to the impeller mounting structure, and a water inlet is provided at one end of the impeller mounting structure connected to the housing; The drive motor is nested with the housing, and the rotating shaft of the drive motor passes through the housing and extends toward the impeller mounting structure; The impeller is installed in the impeller installation structure and connected to the rotating shaft of the driving motor; The impeller comprises: an impeller body, and a first sand removal blade arranged at one axial end of the impeller body; a plurality of impeller blades arranged circumferentially of the impeller body; The first sand discharge blade is arranged at the water inlet end of the impeller body, and is arranged starting from the middle position of the water inlet end and extending toward the edge position of the water inlet end; Along the circumference of the water inlet end, a plurality of the first sand discharge blades are arranged at equal intervals; There is a gap between the first sand discharge blade and the end of the shell or they are arranged flush with each other.

[0007] According to one aspect of the present invention, along the radial direction of the water inlet end of the impeller body, the end of the first sand removal blade protrudes from the outer side surface of the water inlet end; The end of the first sand discharge blade protruding from the radial outer side of the water inlet end is provided with a rotating cutting blade; A stationary cutting piece is disposed at an edge of one end of the housing opposite to the impeller body, and the stationary cutting piece is protruded in a direction close to the impeller body; A plurality of the stationary cutting members are arranged at equal intervals along the circumference of the housing; A stationary cutting blade is provided on the inner side of the stationary cutting member along the radial direction of the housing; When the impeller rotates relative to the housing, the rotating cutting blade and the stationary cutting blade form a cutting pair; The stationary cutting member is integrally provided with the housing, or the stationary cutting member (A1) is detachably provided with the housing.

[0008] According to one aspect of the present invention, the stationary cutting edge is a wavy cutting edge; Along the axial direction of the impeller, the length of the stationary cutting edge is the same as that of the rotating cutting edge, and at least a portion of the stationary cutting edge is arranged obliquely relative to the rotating cutting edge.

[0009] According to one aspect of the present invention, the inclination angle of the portion of the stationary cutting edge that is inclined relative to the rotating cutting edge is 20° to 30°.

[0010] According to one aspect of the present invention, a second sand removal blade is provided at the outer edge of the impeller blade along the radial direction of the impeller body; The second sand removal blade comprises: a first blade portion and a second blade portion; The first blade portion is arranged at an angle with the impeller blade on a side of the impeller blade away from the water inlet end of the impeller body, wherein one end of the first blade portion is fixedly connected to the outer edge of the impeller blade, and the other end is extended in a direction away from the impeller blade; The second blade part is arranged at an end of the first blade part away from the impeller blade at an angle to the first blade part, wherein one end of the second blade part is fixedly connected to the first blade part and the other end is extended in a direction toward the impeller blade.

[0011] To achieve the above-mentioned object of the invention, the present invention provides an impeller, comprising: an impeller body, a first sand removal blade arranged at one axial end of the impeller body; a plurality of impeller blades arranged circumferentially of the impeller body; The first sand discharge blade is arranged at the water inlet end of the impeller body, and is arranged starting from the middle position of the water inlet end and extending toward the edge position of the water inlet end; A plurality of first sand discharge blades are arranged at equal intervals along the circumference of the water inlet end.

[0012] According to one aspect of the present invention, along the radial direction of the water inlet end of the impeller body, the end of the first sand removal blade protrudes from the outer side surface of the water inlet end; The end of the first sand discharge blade protruding from the radial outer side of the water inlet end is provided with a rotating cutting blade.

[0013] According to one aspect of the present invention, a second sand removal blade is provided at the outer edge of the impeller blade along the radial direction of the impeller body; The second sand removal blade comprises: a first blade portion and a second blade portion; The first blade portion is arranged at an angle with the impeller blade on a side of the impeller blade away from the water inlet end of the impeller body, wherein one end of the first blade portion is fixedly connected to the outer edge of the impeller blade, and the other end is extended in a direction away from the impeller blade; The second blade part is arranged at an end of the first blade part away from the impeller blade at an angle to the first blade part, wherein one end of the second blade part is fixedly connected to the first blade part and the other end is extended in a direction toward the impeller blade.

[0014] According to one aspect of the present invention, along the radial direction of the impeller body, a first avoidance groove is provided on the outer side of the position where the second sand discharge blade is connected to the impeller blade; Along the running direction of the impeller blade, the first avoidance groove starts from the tail end of the impeller blade and extends toward the front end of the impeller blade; wherein the first avoidance groove is provided with an opening at the tail end of the impeller blade.

[0015] According to one aspect of the present invention, along the axial direction of the impeller body, at least part of the rotating cutting edges of the first sand removal blades are aligned with the inlet end of the impeller blade running direction; The first sand-discharging blade is integrally provided with the impeller body, or the first sand-discharging blade is detachably connected to the impeller body.

[0016] According to one scheme of the present invention, the permanent magnet variable frequency sewage ultra-light drainage pump of the present invention has a beneficial drainage effect and can achieve effects such as sand discharge and cutting of entanglements through structural optimization of the impeller, effectively ensuring its stable and reliable operation in complex environments, and further effectively ensuring its overall working efficiency and performance.

[0017] According to one scheme of the present invention, when the permanent magnet variable frequency sewage ultra-light drainage pump is working, the rotating cutting blade rotates together with the impeller body, and the rotating cutting blade and the stationary cutting blade form a rotating cutting pair under the action of cross-cutting. The faster the rotation speed of the impeller body, the faster the cutting frequency, and the cut flocculent entanglements enter the impeller body under the action of water suction and are discharged from the rectifier body.

[0018] According to one scheme of the present invention, the impeller of the present invention is provided with first sand discharge blades evenly distributed circumferentially on the end face of the impeller, and a rotating cutting blade is designed at the maximum outer circle of the first sand discharge blade, and at the same time cooperates with a stationary cutting blade designed on the non-rotating shell, so that when the water pump is working, the first sand discharge blade rotates to generate water pressure and centrifugal force to prevent sand from entering the inside of the water pump from the rotating shaft; at the same time, the high-speed rotating cutting blade interacts with the stationary cutting blade to continuously cut the flocculent entanglements that enter the junction of the rotating parts and the non-rotating parts, and the intercepted sand and the cut flocculent entanglements enter from the impeller under the action of the water flow suction and are discharged from the rectifier body, thereby effectively improving the service life in the sewage environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a structural diagram schematically showing a permanent magnet variable frequency sewage ultra-light drainage pump according to an embodiment of the present invention; Figure 2 is a structural diagram schematically showing an impeller according to an embodiment of the present invention; Figure 3 is a structural diagram schematically showing a water inlet end of an impeller according to an embodiment of the present invention; Figure 4 is a partial cross-sectional view schematically showing a permanent magnet variable frequency sewage ultra-light drainage pump according to an embodiment of the present invention; Figure 5 is a structural diagram schematically showing a housing according to an embodiment of the present invention; Figure 6is a diagram schematically showing the relative positions of a cutting pair consisting of a rotating cutting blade and a stationary cutting blade according to an embodiment of the present invention; Figure 7 FIG. 1 is a partial cross-sectional view schematically showing an impeller and an impeller mounting structure according to an embodiment of the present invention. DETAILED DESCRIPTION

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] When describing the embodiments of the present invention, the orientation or positional relationship expressed by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or positional relationship shown in the relevant drawings and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0022] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the embodiments of the present invention are not therefore limited to the following embodiments.

[0023] Combination Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, according to one embodiment of the present invention, the present invention provides a permanent magnet variable frequency sewage ultra-light drainage pump including: a housing A, an impeller mounting structure B, a drive motor C and an impeller D. In this embodiment, the housing A is coaxially connected to the impeller mounting structure B, and a water inlet is provided between the housing A and the impeller mounting structure B; wherein a connecting frame for connecting the housing A is provided on the impeller mounting structure B, and the provided connecting frame can not only realize the fixing of the relative position of the housing A and the impeller mounting structure B, but also realize the formation of the water inlet through the opening on the connecting frame.

[0024] In this embodiment, the connection frame includes: a first connection ring and a second connection ring that are arranged parallel to each other and coaxially, and a plurality of connection beams for connecting the first connection ring and the second connection ring. In this embodiment, along the circumference of the connection frame, a plurality of connection beams are arranged at equal intervals from each other; wherein the radial dimension of the first connection ring matches the radial dimension of the end of the impeller mounting structure B, and the radial dimension of the second connection ring matches the radial dimension of the connection position on the housing A. In this embodiment, the first connection ring, the second connection ring and the connection beam are fixed by integral molding, welding, threaded connection, etc. to maintain the stability of the entire structure. Accordingly, the first connection ring can be installed with the impeller mounting structure B by a threaded connector, and the second connection ring can be installed with the housing A by a threaded connector.

[0025] In this embodiment, the drive motor C is nested with the shell A, and the rotating shaft of the drive motor C passes through the shell A and extends in the direction of the impeller mounting structure B; wherein the drive motor C and the shell A are connected in a nested manner, and a mechanical sealing structure is provided at the connection position to effectively ensure the overall waterproofness.

[0026] In this embodiment, the impeller D is installed in the impeller mounting structure B and is connected to the rotating shaft of the drive motor 1; wherein the impeller D includes: an impeller body 11, and a first sand removal blade 12 arranged at one axial end of the impeller body 11; wherein the impeller body 11 as a whole adopts a centrifugal impeller, and a plurality of impeller blades 111 are arranged circumferentially of the impeller body 11. For example, the impeller blades 111 can be arranged to be four at equal intervals along the circumference of the impeller body 11. Of course, it can also be set to other numbers (such as three, five, etc.) which can be adjusted according to the specific actual design scheme. In this embodiment, the first sand removal blades 12 are arranged at the water inlet end of the impeller body 11, and along the radial direction of the impeller body 11, the first sand removal blades 12 start from the middle position of the water inlet end and extend to the edge position of the water inlet end; wherein, in order to facilitate the sleeve connection with the rotating shaft, the impeller body 11 is provided with an axial hole in the middle position for the insertion of the rotating shaft, for this purpose, the first sand removal blades 12 can be set based on the edge of the axial hole as the starting point and extend to the edge position of the water inlet end.

[0027] In this embodiment, the first sand discharge blade 12 can be set as a long strip blade, and its extension direction is consistent with the radial direction of the impeller body 11. Further, along the circumference of the water inlet end, a plurality of first sand discharge blades 12 are arranged at equal intervals. In this embodiment, the number of the first sand discharge blades 12 is consistent with the impeller blades 111, thereby achieving the corresponding arrangement of the first sand discharge blades 12 and the impeller blades 111.

[0028] In this embodiment, the first sand removal blade 12 is arranged adjacent to the end of the shell A, wherein there is a gap or a flush setting between the first sand removal blade 12 and the end of the shell A. Preferably, there is a gap between the first sand removal blade 12 and the end of the shell A to effectively avoid mutual wear of sand particles, thereby increasing the service life of the present invention.

[0029] Furthermore, the end face of the first sand-removing blade 12 opposite to the end of the shell A can be set as an inclined surface, wherein, taking the rotation direction of the impeller D during operation as the forward direction, the inclined end face can make the front edge of the end face closest to the end of the shell A, and the rear edge of the end face farthest from the end of the shell A. Therefore, when the first sand-removing blade 12 rotates with the impeller body 11, the sand removal effect can be achieved through the front side. Furthermore, based on the inclined setting of the end face, the interval between the end face and the end of the shell A can be enlarged, thereby the sand leaking from the gap between the front edge of the end face and the end of the shell A can quickly pass through based on the gradually increasing interval at the rear, effectively avoiding the retention of sand between the end face of the first sand-removing blade 12 and the end of the shell A, and effectively avoiding mutual wear.

[0030] Combination Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, according to one embodiment of the present invention, along the radial direction of the water inlet end of the impeller body 11, the end of the first sand removal blade 12 protrudes from the outer side surface of the water inlet end; wherein, the end of the first sand removal blade 12 protruding from the radial outer side surface of the water inlet end is provided with a rotating cutting edge; in this embodiment, the rotating cutting edge can be set as a straight cutting edge, wherein the extension direction of the straight cutting edge is set parallel to the axial direction of the impeller body 11.

[0031] Furthermore, a stationary cutting piece A1 is provided at the edge of the end of the housing A opposite to the impeller body 11, and the stationary cutting piece A1 is provided protrudingly in the direction close to the impeller body 11; specifically, along the axial direction of the impeller body 11, the protruding portion of the stationary cutting piece A1 is at least flush with the position where the first sand discharge blade 12 and the impeller body 11 are connected. By providing the stationary cutting piece A1 protrudingly, a stationary cutting edge can be provided on the inner side of the stationary cutting piece A1 in the radial direction of the housing A; furthermore, when the impeller D rotates relative to the housing A, the rotating cutting edge and the stationary cutting edge form a cutting pair.

[0032] Combination Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, according to one embodiment of the present invention, in the radial direction of the shell A, the inner side surface of the stationary cutting member A1 is inclined, wherein, in the rotation direction of the impeller D when the impeller D is running, the inner side surface of the stationary cutting member A1 is inclined outwardly away from the impeller D, so that the inner side surface of the stationary cutting member A1 forms a stationary cutting edge at the position closest to the rotating cutting edge when the impeller D rotates, thereby enabling the relative cutting action of the stationary cutting edge and the rotating cutting edge to be achieved when the impeller D is running, and further, the inclined inner side surface of the stationary cutting member A1 can enable the cut objects to be discharged smoothly along the inclined direction, effectively avoiding the obstruction, entanglement, etc. of the objects between the cutting pairs.

[0033] like Figure 6 As shown, according to one embodiment of the present invention, the stationary cutting edge is a wavy cutting edge; wherein, along the axial direction of the impeller D, the length of the stationary cutting edge is the same as the length of the rotating cutting edge, and at least a portion of the stationary cutting edge is arranged obliquely relative to the rotating cutting edge.

[0034] Through the above arrangement, when the permanent magnet variable frequency sewage ultra-light drainage pump is working, the rotating cutting blade rotates together with the impeller body 11, and the rotating cutting blade and the stationary cutting blade form a rotating cutting pair under the action of cross-cutting. The faster the rotation speed of the impeller body 11, the faster the cutting frequency, and the cut flocculent entanglements enter from the impeller body 11 under the action of water suction and are discharged from the rectifier body.

[0035] In this embodiment, the wavy blade can be provided with three inclined parts and two parallel parts; wherein the inclined parts and the parallel parts are arranged alternately, thereby realizing that the wavy blade is inclined relative to the blade of the rotating cutting blade as a whole, wherein the parallel parts in the wavy blade are parallel to the blade of the rotating cutting blade, thereby, under the inclined extension of the inclined parts in the wavy blade, the intervals between different parallel parts and the blade of the rotating cutting blade can be different, thereby generating multiple cutting positions between the wavy blade and the blade of the rotating cutting blade, and the inclined parts in the wavy blade play a guiding and force-adding effect. Therefore, for windings with harder materials, after multiple force-adding cuttings by the wavy static cutting blade, the cut windings will be sucked into the impeller body 11 with the water flow, and the windings that cannot be cut will be introduced into the impeller blades by the wavy static cutting blade, and sucked in by the strong impeller suction, which ensures the cutting efficiency and enables the windings that cannot be cut to enter the impeller in time and then be discharged from the rectifier. In addition, based on the setting of the wavy blade edge, things that are easy to cut can be cut at the first cutting position, and things that are difficult to cut can be cut at the second cutting position. Things that cannot be cut after the second cutting will also be cut and discharged along a larger width, effectively preventing the entanglement from getting stuck.

[0036] In this embodiment, the inclination angle of the portion of the stationary cutting blade that is inclined relative to the rotating cutting blade is 20° to 30°, that is, the angle between the inclined portion of the stationary cutting blade and the cutting edge of the rotating cutting blade is 20° to 30°. Through the above arrangement, the inclined portion of the stationary cutting blade is set within the range of 20° to 30°, so that the interval between the parallel portion and the cutting edge of the rotating cutting blade can be just controlled to the effect of easily cutting off the winding, thereby making the cutting effect of the present invention more beneficial. If the inclination angle of the inclined portion is less than 20°, it is easy to cause the interval between the parallel portion of the stationary cutting blade and the cutting edge of the rotating cutting blade to be too small, which is easy to cause the winding to be stuck. If the inclination angle of the inclined portion is greater than 30°, it is easy to cause the interval between the parallel portion of the stationary cutting blade and the cutting edge of the rotating cutting blade to be too large, which is easy to cause the winding to fail to be fully cut.

[0037] Furthermore, the present invention arranges the cutting pair formed by the rotating cutting blade and the stationary cutting blade at the water inlet of the impeller body 11, and compared with the conventional sewage pump cutting device, it has the following characteristics: small size and low failure rate. The small size of the cutting pair basically does not affect the water inlet flow channel of the water pump, nor does it hinder the water inlet of the water pump impeller. At the same time, since the cutting pair only quickly cuts the flocculent windings at the junction of the rotating parts and the non-rotating parts, the power loss caused by the cutting action is also very small. The flocculent windings or windings that cannot be cut off can be discharged through the impeller in time. The cutting and discharge efficiency is high, and no secondary winding is caused. Furthermore, the present invention arranges the cutting pair formed by the rotating cutting blade and the stationary cutting blade at a position close to the water inlet end of the impeller body 11, which can also effectively prevent debris from entering the water pump and causing water pump wear and mechanical seal failure. When the water pump is working in a sewage environment, large debris is preferentially sucked from the outer circle of the impeller body 11 under the action of the rotating suction of the impeller. Due to the large size of this part of debris, it is easy to cause the cutting device to fail or get stuck during cutting, while small debris tends to be concentrated near the center of the impeller and enter the impeller. This part of debris is mainly floc-like entanglements, which are relatively easy to cut and are also the debris most likely to be entangled on the impeller. The cutting pair of this design avoids large debris and efficiently cuts floc-like entanglements that are easy to cause entanglement and easy to cut, thereby solving the problem of easy entanglement and easy wear caused by floc-like entanglements under sewage conditions.

[0038] Furthermore, the rotating first sand discharge blade 12 generates water pressure at the first sand discharge blade 12 under the action of centrifugal force, forming a pressure chamber, which can effectively prevent sand particles in small-volume debris from entering. Even if sand enters the pressure chamber, it will be thrown out under the action of centrifugal force. This structure generates a static water pressure chamber through rotating blades, which has the characteristics of low power loss and long service life. Since the water pressure chamber is small in volume and is filled with clean water, the power required by this part is small, and the consumption of the entire water pump is small; Furthermore, the static water pressure chamber blocking anti-sand method can effectively block sand from contacting the rotating shaft of the water pump. At the same time, it can also effectively prevent the wear of the rotating and static mating surfaces after the sand enters the chamber, effectively solving the problem of the aluminum alloy lightweight shell being not wear-resistant and easy to wear under sewage conditions.

[0039] Furthermore, by forming a static pressure chamber during the cutting and rotation process, less pump power is consumed without hindering the water inlet of the impeller and affecting the efficiency of the pump, and the flocculent entanglements are efficiently cut and sand is blocked from entering the pump. This maintains the light weight and portability advantage of the permanent magnet variable frequency sewage ultra-light drainage pump, and effectively improves the reliability and service life of the permanent magnet variable frequency sewage ultra-light drainage pump in the sewage environment, and also solves the problems of high power loss, easy failure and jamming of conventional water pump cutting devices.

[0040] like Figure 5 As shown, according to an embodiment of the present invention, the stationary cutting member A1 is integrally provided with the housing A, or the stationary cutting member A1 and the housing A are detachably provided. If the stationary cutting member A1 and the housing A are detachably connected, they can be fixed by a threaded connector.

[0041] Through the above arrangement, the method of integrally arranging the stationary cutting member A1 and the housing A can effectively ensure the connection reliability of the stationary cutting member A1 and the housing A, and can also simplify the structural manufacturing process. Of course, by making the stationary cutting member A1 detachable from the housing A, the position of the stationary cutting member A1 can be accurately adjusted during use to optimize the cutting efficiency, and the stationary cutting member A1 can also be replaced to improve the maintainability of the present invention.

[0042] Combination Figure 4 and Figure 5 As shown, according to one embodiment of the present invention, a plurality of stationary cutting members A1 are arranged at equal intervals along the circumference of the shell A; wherein the number of stationary cutting members A1 can be consistent with the number of the first sand discharge blades 12, thereby effectively ensuring that each rotating cutting edge has a stationary cutting edge capable of forming a cutting pair, so as to effectively ensure the cutting performance and efficiency of the present invention.

[0043] like Figure 5 As shown, according to one embodiment of the present invention, the stationary cutting member A1 is a wear-resistant hard steel cutting member; wherein the stationary cutting member A1 is made of 2Cr13 material.

[0044] Through the above arrangement, the stationary cutting member A1 of the present invention has the advantages of high strength and wear resistance, which is beneficial to improving its long-term reliable operation in harsh environments and effectively prolonging its service life.

[0045] Combination Figure 2and Figure 7 As shown, according to an embodiment of the present invention, a second sand-removing blade 111a1 is provided at the outer edge of the impeller blade 111 along the radial direction of the impeller body 11; wherein the second sand-removing blade 111a1 includes: a first blade portion 111a11 and a second blade portion 111a12; in the present embodiment, the first blade portion 111a11 is arranged at an angle with the impeller blade 111 on the side of the impeller blade 111 away from the water inlet end of the impeller body 11, wherein one end of the first blade portion 111a11 is fixedly connected to the outer edge of the impeller blade 111, and the other end is extended in a direction away from the impeller blade 111; the second blade portion 111a12 is arranged at an end of the first blade portion 111a11 away from the impeller blade 111 at an angle with the first blade portion 111a11, wherein one end of the second blade portion 111a12 is fixedly connected to the first blade portion 111a11, and the other end is extended in a direction toward the impeller blade 111. In the present embodiment, the second blade portion 111 a 12 is disposed parallel to the impeller blade 111 .

[0046] Through the above-mentioned arrangement, the second sand-removing blade 111a1 is arranged at the outer edge of the impeller blade 111, so that the second sand-removing blade 111a1 forms a bent surrounding structure at the outer edge of the impeller blade 111, wherein the impeller blade 111, the first blade part 111a11 and the second blade part 111a12 are arranged in sequence so that a groove along the shape of the impeller blade 111 is formed at the outer edge position of the impeller blade 111, and then, during the rotation of the impeller body 11, the sediment carried in the water can be restricted between the impeller blade 111 and the second sand-removing blade 111a1 based on the arranged second sand-removing blade 111a1, effectively avoiding the disadvantage that the sediment gathers to the impeller mounting structure B under the centrifugal force, thereby effectively reducing the wear between the impeller blade 111 and the impeller mounting structure B, and effectively improving the service life of the present invention.

[0047] like Figure 2 As shown, according to one embodiment of the present invention, along the rotation direction of the impeller D during operation, a beveled surface 111a111 is provided at the front end of the first blade portion 111a11, and the beveled surface 111a111 is provided to reduce the thickness of the front end of the first blade portion 111a11, thereby facilitating the cutting of silt in the water, thereby increasing the effect of collecting silt in the water, and also effectively reducing the resistance of the first blade portion 111a11 during rotation, thereby improving the operating efficiency of the present invention.

[0048] Combination Figure 2 and Figure 7As shown, according to an embodiment of the present invention, along the radial direction of the impeller body 11, a first avoidance groove 111b is provided outside the position where the second sand discharge blade 111a1 is connected to the impeller blade 111; wherein, along the running direction of the impeller blade 111 (i.e., the rotation direction of the impeller D when running), the first avoidance groove 111b starts from the tail end of the impeller blade 111 and extends toward the front end direction of the impeller blade 111; wherein, the first avoidance groove 111b is provided with an opening at the tail end of the impeller blade 111. In this embodiment, the cross-sectional shape of the first avoidance groove 111b can be set to an arc, a rectangle, a triangle, etc.

[0049] Through the above-mentioned configuration, by arranging the first avoidance groove 111b on the outer side of the connection position between the impeller blade 111 and the second sand removal blade 111a1, the impeller blade 111 can avoid wear caused by mud and sand blockage between the outer side and the impeller mounting structure B during rotation. The mud and sand can be accommodated and discharged through the arranged first avoidance groove 111b, thereby effectively ensuring the service life of the present invention.

[0050] Furthermore, along the running direction of the impeller blade 111 (i.e., the rotation direction of the impeller D when it is running), the depth of the first avoidance groove 111b gradually increases from the front end to the rear end, so as to increase the capacity to accommodate sediment during the rotation process and facilitate the transitional discharge of sediment, thereby avoiding the accumulation of sediment in the first avoidance groove 111b, and further ensuring the working performance of the present invention.

[0051] like Figure 4 As shown, according to one embodiment of the present invention, along the axial direction of the impeller body 11, at least part of the rotating cutting edges of the first sand removal blades 12 are aligned with the inlet end of the impeller blades 111 in the running direction; in this embodiment, the first sand removal blades 12 are arranged one-to-one with the impeller blades 111, so that the rotating cutting edges of the first sand removal blades 12 radially protruding from the impeller body 11 can be aligned with the inlet end of the impeller blades 111, and then on the one hand, the radially discharged mud and sand can be quickly accepted by the impeller blades 111 through the first sand removal blades 12, and on the other hand, the entangled objects can be cut off by the rotating cutting edges while being conveniently sucked into the impeller blades 111 to achieve rapid discharge. In this embodiment, the first sand removal blades 12 are arranged integrally with the impeller body 11, or the first sand removal blades 12 are detachably connected to the impeller body 11.

[0052] Combination Figure 2 and Figure 3As shown, according to an embodiment of the present invention, an impeller of the present invention comprises: an impeller body 11, and a first sand removal blade 12 arranged at one axial end of the impeller body 11; wherein the impeller body 11 as a whole adopts a centrifugal impeller, and a plurality of impeller blades 111 are arranged circumferentially of the impeller body 11, for example, the impeller blades 111 can be arranged at equal intervals along the circumference of the impeller body 11, and of course, they can also be arranged to other numbers (such as three, five, etc.) and can be adjusted according to the specific actual design scheme. In this embodiment, the first sand removal blade 12 is arranged at the water inlet end of the impeller body 11, and it starts from the middle position of the water inlet end and extends to the edge position of the water inlet end; wherein, in order to facilitate the sleeve connection with the rotating shaft, the impeller body 11 is provided with an axial hole in the middle position thereof for the rotating shaft to extend therein, and for this reason, the first sand removal blade 12 can be arranged starting from the edge of the axial hole and extending to the edge position of the water inlet end.

[0053] In this embodiment, the first sand discharge blade 12 can be set as a long strip blade, and its extension direction is consistent with the radial direction of the impeller body 11. Further, along the circumference of the water inlet end, a plurality of first sand discharge blades 12 are arranged at equal intervals. In this embodiment, the number of the first sand discharge blades 12 is consistent with the impeller blades 111, thereby achieving the corresponding arrangement of the first sand discharge blades 12 and the impeller blades 111.

[0054] Combination Figure 2 and Figure 3 As shown, according to one embodiment of the present invention, along the radial direction of the water inlet end of the impeller body 11, the end of the first sand removal blade 12 protrudes from the outer side surface of the water inlet end; wherein, the end of the first sand removal blade 12 protruding from the radial outer side surface of the water inlet end is provided with a rotating cutting edge; in this embodiment, the rotating cutting edge can be set as a straight cutting edge, wherein the extension direction of the straight cutting edge is set parallel to the axial direction of the impeller body 11.

[0055] Through the above-mentioned arrangement, based on the one-to-one correspondence between the first sand removal blade 12 and the impeller blade 111, it can be effectively ensured that the cutting position of the rotating cutting blade corresponds to the inlet end of the impeller blade 111, thereby helping to cut off the flocculent entanglements while facilitating the suction force generated by the impeller blade 111 to be smoothly sucked away, effectively avoiding further entanglement of the broken flocculent entanglements, and being more beneficial to ensuring the stable rotation of the impeller body 11.

[0056] like Figure 2As shown, according to an embodiment of the present invention, a second sand-removing blade 111a1 is provided at the outer edge of the impeller blade 111 along the radial direction of the impeller body 11; wherein the second sand-removing blade 111a1 includes: a first blade portion 111a11 and a second blade portion 111a12; in the present embodiment, the first blade portion 111a11 is arranged at an angle with the impeller blade 111 on the side of the impeller blade 111 away from the water inlet end of the impeller body 11, wherein one end of the first blade portion 111a11 is fixedly connected to the outer edge of the impeller blade 111, and the other end is extended in a direction away from the impeller blade 111; the second blade portion 111a12 is arranged at an end of the first blade portion 111a11 away from the impeller blade 111 at an angle with the first blade portion 111a11, wherein one end of the second blade portion 111a12 is fixedly connected to the first blade portion 111a11, and the other end is extended in a direction toward the impeller blade 111. In the present embodiment, the second blade portion 111 a 12 is disposed parallel to the impeller blade 111 .

[0057] Through the above-mentioned arrangement, the second sand-removing blade 111a1 is arranged at the outer edge of the impeller blade 111, so that the second sand-removing blade 111a1 forms a bent surrounding structure at the outer edge of the impeller blade 111, wherein the impeller blade 111, the first blade part 111a11 and the second blade part 111a12 are arranged in sequence so that a groove along the shape of the impeller blade 111 is formed at the outer edge position of the impeller blade 111, and then, during the rotation of the impeller body 11, the sediment carried in the water can be restricted between the impeller blade 111 and the second sand-removing blade 111a1 based on the arranged second sand-removing blade 111a1, thereby effectively avoiding the disadvantage that the sediment gathers to other structures under the centrifugal force, thereby effectively reducing the wear between the impeller blade 111 and other structures, and effectively improving the service life of the present invention.

[0058] like Figure 2 As shown, according to one embodiment of the present invention, along the rotation direction of the impeller during operation, a beveled surface 111a111 is provided at the front end of the first blade portion 111a11, and the beveled surface 111a111 is provided to reduce the thickness of the front end of the first blade portion 111a11, thereby facilitating the cutting of silt in the water, thereby increasing the effect of collecting silt in the water, and also effectively reducing the resistance of the first blade portion 111a11 during rotation, thereby improving the operating efficiency of the present invention.

[0059] like Figure 2As shown, according to one embodiment of the present invention, along the radial direction of the impeller body 11, a first avoidance groove 111b is provided outside the position where the second sand discharge blade 111a1 is connected to the impeller blade 111; wherein, along the running direction of the impeller blade 111 (i.e., the rotation direction of the impeller when running), the first avoidance groove 111b starts from the tail end of the impeller blade 111 and extends toward the front end of the impeller blade 111; wherein, the first avoidance groove 111b is provided with an opening at the tail end of the impeller blade 111. In this embodiment, the cross-sectional shape of the first avoidance groove 111b can be set to an arc, a rectangle, a triangle, etc.

[0060] Through the above-mentioned configuration, by arranging the first avoidance groove 111b on the outer side of the connection position between the impeller blade 111 and the second sand removal blade 111a1, the impeller blade 111 can avoid wear caused by mud and sand blockage between the outer side and the impeller mounting structure B during rotation. The mud and sand can be accommodated and discharged through the arranged first avoidance groove 111b, thereby effectively ensuring the service life of the present invention.

[0061] Furthermore, along the running direction of the impeller blade 111 (i.e., the rotation direction of the impeller when running), the depth of the first avoidance groove 111b gradually increases from the front end to the rear end, so as to increase the capacity to accommodate sediment during the rotation process and facilitate the transitional discharge of sediment, thereby avoiding the accumulation of sediment in the first avoidance groove 111b, and further ensuring the working performance of the present invention.

[0062] Combination Figure 2 and Figure 3 As shown, according to one embodiment of the present invention, along the axial direction of the impeller body 11, the rotating cutting edges of at least part of the first sand removal blades 12 are aligned with the inlet end of the impeller blades 111 in the running direction; in this embodiment, the first sand removal blades 12 are arranged in a one-to-one correspondence with the impeller blades 111, so that the rotating cutting edges of the first sand removal blades 12 radially protruding from the impeller body 11 can be aligned with the inlet end of the impeller blades 111, and then on the one hand, the radially discharged mud and sand can be quickly received by the impeller blades 111 through the first sand removal blades 12, and on the other hand, the entangled objects can be cut off by the rotating cutting edges while being conveniently sucked into the impeller blades 111 to achieve rapid discharge.

[0063] The above arrangement effectively ensures the unity of the cutting of the flocculent windings by the rotating cutting blade and the water absorption of the impeller blades 111, ensuring the smooth operation of the entire process. In addition, it can also effectively prevent the further hooking of the broken flocculent windings formed after the cutting by the rotating cutting blade, which is beneficial to ensuring the smooth output of the broken flocculent windings.

[0064] like Figure 3As shown, according to one embodiment of the present invention, the first sand-discharging blade 12 is integrally provided with the impeller body 11 , or the first sand-discharging blade 12 is detachably connected to the impeller body 11 .

[0065] Through the above arrangement, the first sand discharge blade 12 and the impeller body 11 are integrally arranged to effectively ensure the connection reliability between the first sand discharge blade 12 and the impeller body 11, and the structural manufacturing process can also be simplified. Of course, by making the first sand discharge blade 12 detachable from the impeller body 11, the position of the first sand discharge blade 12 can be accurately adjusted during use to optimize the cutting efficiency, and the first sand discharge blade 12 can be replaced to improve the maintainability of the present invention.

[0066] like Figure 3 As shown, according to one embodiment of the present invention, the first sand discharge blade 12 is a wear-resistant hard steel blade, for example, the first sand discharge blade 12 is a 2Cr13 material blade; Through the above arrangement, the first sand discharge blade 12 of the present invention has the advantages of high strength and wear resistance, which is beneficial to improving its long-term reliable operation in harsh environments and effectively prolonging its service life.

[0067] The above contents are merely examples of specific solutions of the present invention. For devices and structures not described in detail therein, it should be understood that they can be implemented by adopting general devices and general methods available in the art.

[0068] The above is only one solution of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A permanent magnet variable frequency sewage ultra-light drainage pump, characterized in that: include: Casing (A), impeller mounting structure (B), drive motor (C) and impeller (D); The housing (A) is coaxially connected to the impeller mounting structure (B), and a water inlet is provided at one end of the impeller mounting structure (B) connected to the housing (A); The driving motor (C) is nested with the housing (A), and the rotating shaft of the driving motor (C) passes through the housing (A) and extends toward the impeller mounting structure (B); The impeller (D) is mounted in the impeller mounting structure (B) and is connected to the rotating shaft of the drive motor (1); The impeller (D) comprises: an impeller body (11), and a first sand removal blade (12) arranged at one axial end of the impeller body (11); A plurality of impeller blades (111) arranged in the circumferential direction of the impeller body (11); The first sand removal blade (12) is arranged at the water inlet end of the impeller body (11), and is arranged starting from the middle position of the water inlet end and extending towards the edge position of the water inlet end; Along the circumference of the water inlet end, a plurality of the first sand discharge blades (12) are arranged at equal intervals; There is a gap between the first sand discharge blade (12) and the end of the housing (A) or they are arranged flush with each other.

2. The permanent magnet variable frequency sewage ultra-light drainage pump according to claim 1 is characterized in that: Along the radial direction of the water inlet end of the impeller body (11), the end of the first sand removal blade (12) protrudes from the outer side surface of the water inlet end; The end of the first sand discharge blade (12) protruding from the radial outer side surface of the water inlet end is provided with a rotating cutting blade; A stationary cutting piece (A1) is provided at an edge of one end of the housing (A) opposite to the impeller body (11), and the stationary cutting piece (A1) is protruding in a direction close to the impeller body (11); Along the circumference of the housing (A), a plurality of stationary cutting members (A1) are arranged at equal intervals; A stationary cutting blade is provided on the inner side of the stationary cutting member (A1) along the radial direction of the housing (A); When the impeller (D) rotates relative to the housing (A), the rotating cutting blade and the stationary cutting blade form a cutting pair; The stationary cutting member (A1) is integrally provided with the housing (A), or the stationary cutting member (A1) and the housing (A) are detachably provided.

3. The permanent magnet variable frequency sewage ultra-light drainage pump according to claim 2 is characterized in that: The stationary cutting edge is a wavy cutting edge; Along the axial direction of the impeller (D), the length of the stationary cutting edge is the same as that of the rotating cutting edge, and at least a portion of the stationary cutting edge is arranged obliquely relative to the rotating cutting edge.

4. The permanent magnet variable frequency sewage ultra-light drainage pump according to claim 3 is characterized in that: The inclination angle of the portion of the stationary cutting edge that is inclined relative to the rotating cutting edge is 20° to 30°.

5. The permanent magnet variable frequency sewage ultra-light drainage pump according to claim 4 is characterized in that: A second sand removal blade (111a1) is provided on the outer edge of the impeller blade (111) along the radial direction of the impeller body (11); The second sand-discharging blade (111a1) comprises: a first blade part (111a11) and a second blade part (111a12); The first blade portion (111a11) is arranged at an angle with the impeller blade (111) on a side of the impeller blade (111) away from the water inlet end of the impeller body (11), wherein one end of the first blade portion (111a11) is fixedly connected to the outer edge of the impeller blade (111), and the other end is extended in a direction away from the impeller blade (111); The second blade portion (111a12) is arranged at an end of the first blade portion (111a11) away from the impeller blade (111) at an angle with the first blade portion (111a11), wherein one end of the second blade portion (111a12) is fixedly connected to the first blade portion (111a11), and the other end is extended in a direction toward the impeller blade (111).

6. An impeller, characterized in that: include: An impeller body (11), and a first sand removal blade (12) arranged at one axial end of the impeller body (11); A plurality of impeller blades (111) arranged in the circumferential direction of the impeller body (11); The first sand removal blade (12) is arranged at the water inlet end of the impeller body (11), and is arranged starting from the middle position of the water inlet end and extending towards the edge position of the water inlet end; Along the circumference of the water inlet end, a plurality of the first sand discharge blades (12) are arranged at equal intervals.

7. The impeller according to claim 6, characterized in that Along the radial direction of the water inlet end of the impeller body (11), the end of the first sand removal blade (12) protrudes from the outer side surface of the water inlet end; The end of the first sand discharge blade (12) protruding from the radial outer side surface of the water inlet end is provided with a rotating cutting blade.

8. The impeller according to claim 7, characterized in that A second sand removal blade (111a1) is provided on the outer edge of the impeller blade (111) along the radial direction of the impeller body (11); The second sand-discharging blade (111a1) comprises: a first blade part (111a11) and a second blade part (111a12); The first blade portion (111a11) is arranged at an angle with the impeller blade (111) on a side of the impeller blade (111) away from the water inlet end of the impeller body (11), wherein one end of the first blade portion (111a11) is fixedly connected to the outer edge of the impeller blade (111), and the other end is extended in a direction away from the impeller blade (111); The second blade portion (111a12) is arranged at an end of the first blade portion (111a11) away from the impeller blade (111) at an angle with the first blade portion (111a11), wherein one end of the second blade portion (111a12) is fixedly connected to the first blade portion (111a11), and the other end is extended in a direction toward the impeller blade (111).

9. The impeller according to claim 8, characterized in that Along the radial direction of the impeller body (11), a first avoidance groove (111b) is provided on the outer side of the position where the second sand removal blade (111a1) is connected to the impeller blade (111); Along the running direction of the impeller blade (111), the first avoidance groove (111b) is arranged starting from the tail end of the impeller blade (111) and extending towards the front end direction of the impeller blade (111); wherein the first avoidance groove (111b) is arranged with an opening at the tail end of the impeller blade (111).

10. The impeller according to claim 9, characterized in that Along the axial direction of the impeller body (11), at least part of the rotating cutting edges of the first sand removal blades (12) are aligned with the inlet ends of the impeller blades (111) in the running direction; The first sand-discharging blade (12) is integrally arranged with the impeller body (11), or the first sand-discharging blade (12) is detachably connected to the impeller body (11).

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