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

Abstract

The utility model relates to a permanent magnet frequency conversion ultralight sewage drainage pump and an impeller, and the permanent magnet frequency conversion 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 utility model relates to the technical field of water pumping equipment, 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 rectification effect of the rectifier, so that the water flow generates 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 pumping and drainage operations in 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 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. In particular, the junction of the rotating parts and non-rotating parts of the pump is the position most likely to be entangled by flocs and worn by sand. When the pump is worn, it will greatly affect the performance of the 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 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 the sewage discharge capacity is strong. 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. Utility Model Content

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

[0006] In order to achieve the above-mentioned purpose of the utility model, the utility model provides a permanent magnet variable frequency sewage ultra-light drainage pump, comprising: a casing, an impeller mounting structure, a drive motor and an impeller;

[0007] 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;

[0008] 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;

[0009] The impeller is mounted in the impeller mounting structure and connected to the rotating shaft of the drive motor;

[0010] The impeller comprises: an impeller body, a first sand removal blade arranged at one axial end of the impeller body;

[0011] a plurality of impeller blades arranged circumferentially of the impeller body;

[0012] The first sand removal 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;

[0013] A plurality of first sand discharge blades are arranged at equal intervals along the circumference of the water inlet end;

[0014] There is a gap between the first sand-removing blade and the end of the shell or they are arranged flush with each other.

[0015] 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;

[0016] 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;

[0017] A stationary cutting piece is provided on the 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;

[0018] A plurality of stationary cutting members are arranged at equal intervals along the circumference of the housing;

[0019] A stationary cutting edge is provided on the inner side of the stationary cutting member in the radial direction of the housing;

[0020] When the impeller rotates relative to the housing, the rotating cutting blade and the stationary cutting blade form a cutting pair;

[0021] The stationary cutting member is integrally provided with the housing, or the stationary cutting member (A1) is detachably provided with the housing.

[0022] According to one aspect of the present invention, the stationary cutting edge is a wavy cutting edge;

[0023] 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.

[0024] 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°.

[0025] According to one aspect of the present invention, a second sand removal blade is provided on the outer edge of the impeller blade along the radial direction of the impeller body;

[0026] The second sand removal blade includes: a first blade portion and a second blade portion;

[0027] The first blade portion is arranged at an angle with the impeller blade on a side of the impeller blade facing 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;

[0028] 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 the direction toward the impeller blade.

[0029] In order to achieve the above-mentioned purpose of the utility model, the utility model provides an impeller, comprising: an impeller body, a first sand removal blade provided at one axial end of the impeller body;

[0030] a plurality of impeller blades arranged circumferentially of the impeller body;

[0031] The first sand removal 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;

[0032] A plurality of first sand-removing blades are arranged at equal intervals along the circumference of the water inlet end.

[0033] 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;

[0034] The end portion of the first sand discharge blade protruding from the radial outer side surface of the water inlet end is provided with a rotating cutting edge.

[0035] According to one aspect of the present invention, a second sand removal blade is provided on the outer edge of the impeller blade along the radial direction of the impeller body;

[0036] The second sand removal blade includes: a first blade portion and a second blade portion;

[0037] The first blade portion is arranged at an angle with the impeller blade on a side of the impeller blade facing 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;

[0038] 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 the direction toward the impeller blade.

[0039] 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 connection position between the second sand discharge blade and the impeller blade;

[0040] 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.

[0041] 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;

[0042] 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.

[0043] According to a 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 work efficiency and performance.

[0044] According to a solution of the utility model, 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 impeller body rotates, the faster the cutting frequency is, and the cut flocculent entanglements enter the impeller body under the action of water suction and are discharged from the whole body.

[0045] According to one solution of the present invention, the impeller of the present invention is provided with a first sand-removing blade 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-removing 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-removing blade rotates to generate water pressure and centrifugal force, preventing sand from entering the interior of the water pump from the rotating shaft position; 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 the impeller under the action of the suction force of the water flow and are discharged from the rectifier body, thereby effectively improving the service life in the sewage environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 Schematically shows the structure of a permanent magnet variable frequency sewage ultra-light drainage pump according to an embodiment of the present utility model;

[0047] Figure 2 is a structural diagram schematically showing an impeller according to an embodiment of the present invention;

[0048] Figure 3 Schematically shows the structure of the water inlet end of the impeller according to one embodiment of the present invention;

[0049] 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 utility model;

[0050] Figure 5 is a structural diagram schematically showing a housing according to an embodiment of the present utility model;

[0051] Figure 6 1 is 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;

[0052] Figure 7 It 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

[0053] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0054] When describing the embodiments of the present invention, the orientation or positional relationship expressed by the terms "longitudinal", "transverse", "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. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms cannot be understood as limiting the present invention.

[0055] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the embodiments of the present invention are not limited to the following embodiments.

[0056] Combine Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, according to one embodiment of the present invention, a permanent magnet variable frequency sewage ultra-light drainage pump is provided, comprising: a housing A, an impeller mounting structure B, a drive motor C, and an impeller D. In this embodiment, the housing A and the impeller mounting structure B are coaxially connected, and a water inlet is provided between the housing A and the impeller mounting structure B. A connecting frame for connecting to the housing A is provided on the impeller mounting structure B. The connecting frame not only secures the relative positions of the housing A and the impeller mounting structure B, but also forms the water inlet through the opening in the connecting frame.

[0057] In this embodiment, the connecting frame includes: a first connecting ring and a second connecting ring that are arranged parallel to each other and coaxially, and a plurality of connecting beams for connecting the first connecting ring and the second connecting ring. In this embodiment, the plurality of connecting beams are arranged at equal intervals along the circumference of the connecting frame; wherein the radial dimension of the first connecting ring is arranged to match the radial dimension of the end of the impeller mounting structure B, and the radial dimension of the second connecting ring is arranged to match the radial dimension of the connection position on the casing A. In this embodiment, the first connecting ring, the second connecting ring, and the connecting beams are fixed by integral molding, welding, threaded connection, etc. to maintain the stability of the entire structure. Accordingly, the first connecting ring can be mounted to the impeller mounting structure B using a threaded connector, and the second connecting ring can be mounted to the casing A using a threaded connector.

[0058] In this embodiment, the drive motor C is nested with the housing A, and the rotating shaft of the drive motor C passes through the housing A and extends in the direction of the impeller mounting structure B; wherein, the drive motor C and the housing A are connected in a nested manner, and a mechanical sealing structure is provided at the connection position to effectively ensure the overall waterproofness.

[0059] 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 C; 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 at equal intervals along the circumference of the impeller body 11. Of course, they can also be set 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-removing 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-removing blades 12 start from the middle position of the water inlet end and extend to the edge position of the water inlet end; wherein, the impeller body 11 is provided with an axial hole in its middle position for the insertion of the rotating shaft to facilitate the sleeve connection with the rotating shaft. For this reason, the first sand-removing 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.

[0060] In this embodiment, the first sand-discharging blades 12 can be configured as elongated blades, extending in a direction aligned with the radial direction of the impeller body 11. Furthermore, multiple first sand-discharging blades 12 are provided at equal intervals along the circumference of the water inlet end. In this embodiment, the number of first sand-discharging blades 12 is the same as the number of impeller blades 111, thereby achieving a corresponding arrangement of the first sand-discharging blades 12 and the impeller blades 111.

[0061] In this embodiment, the first sand-removing blade 12 is arranged adjacent to the end of the shell A, wherein there is a gap between the first sand-removing blade 12 and the end of the shell A or they are arranged flush with each other. Preferably, there is a gap between the first sand-removing blade 12 and the end of the shell A to effectively avoid mutual wear of sand particles, thereby improving the service life of the present invention.

[0062] 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. Then, 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 gap 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 gap at the rear, effectively avoiding the sand particles from staying between the end face of the first sand-removing blade 12 and the end of the shell A, and effectively avoiding mutual wear.

[0063] Combine 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.

[0064] Furthermore, a stationary cutting element A1 is provided on the edge of the end of the casing A opposite the impeller body 11. This element A1 protrudes in a direction close to the impeller body 11. Specifically, along the axial direction of the impeller body 11, the protruding portion of the element A1 is at least flush with the connection between the first sand removal blades 12 and the impeller body 11. This protruding portion of the element A1 allows for a stationary cutting edge to be positioned radially inwardly of the casing A. Consequently, when the impeller D rotates relative to the casing A, the rotating cutting edge and the stationary cutting edge form a cutting pair.

[0065] Combine Figure 1 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 As 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. As a result, when the impeller D is running, the relative cutting effect of the stationary cutting edge and the rotating cutting edge can be realized, and further, the inclined inner side surface of the stationary cutting member A1 can make the cut objects discharged smoothly along the inclined direction, effectively avoiding the obstruction, entanglement, etc. of the objects between the cutting pairs.

[0066] 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 part of the stationary cutting edge is arranged obliquely relative to the rotating cutting edge.

[0067] Through the above-mentioned 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.

[0068] In this embodiment, the wavy cutting edge can be provided with three inclined portions and two parallel portions; wherein the inclined portions and the parallel portions are arranged alternately, thereby achieving an overall inclination of the wavy cutting edge relative to the cutting edge of the rotating cutting edge. The parallel portions of the wavy cutting edge are parallel to the cutting edge of the rotating cutting edge. Thus, due to the inclined extension of the inclined portions of the wavy cutting edge, the spacing between the different parallel portions and the cutting edge of the rotating cutting edge can be different, thereby generating multiple cutting positions between the wavy cutting edge and the cutting edge of the rotating cutting edge, and the inclined portions of the wavy cutting edge play a guiding and force-adding role. Thus, for entanglements made of relatively hard materials, after multiple force-adding cuts by the wavy stationary cutting edge, the severed entanglements will be drawn into the impeller body 11 along with the water flow, while the entanglements that cannot be severed will be drawn into the impeller blades by the wavy stationary cutting edge and sucked in by the strong impeller suction, thereby ensuring cutting efficiency and allowing the entanglements that cannot be severed to enter the impeller in a timely manner and then be discharged from the rectifier. In addition, based on the setting of the wavy blade, things that are easy to cut are 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 the larger width, effectively preventing the entanglement from getting stuck.

[0069] In this embodiment, the angle of inclination 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°. By setting the inclined portion of the stationary cutting blade within the range of 20° to 30°, the spacing between the parallel portion and the cutting edge of the rotating cutting blade can be precisely controlled to facilitate cutting of entanglements, thereby achieving a more effective cutting effect of the present invention. If the inclination angle of the inclined portion is less than 20°, the spacing between the parallel portion of the stationary cutting blade and the cutting edge of the rotating cutting blade is too small, which can easily cause entanglements to become stuck. If the inclination angle of the inclined portion is greater than 30°, the spacing between the parallel portion of the stationary cutting blade and the cutting edge of the rotating cutting blade is too large, which can easily result in insufficient cutting of entanglements.

[0070] Furthermore, the present invention arranges the cutting element formed by the rotating cutting blade and the stationary cutting blade at the water inlet of the impeller body 11. Compared with conventional sewage pump cutting devices, the present invention has the following advantages: small size and low failure rate. The small size of the cutting element basically does not affect the water inlet flow path of the water pump, nor does it hinder the water inlet of the water pump impeller. At the same time, because the cutting element only quickly cuts the flocculent entanglements 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 entanglements after cutting or the entanglements that cannot be cut can be discharged through the impeller in time. The cutting and discharge efficiency is high and no secondary entanglement is caused.

[0071] Furthermore, the utility model 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 in from the outer circle of the impeller body 11 under the action of the impeller's rotating suction. 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 concentrate 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.

[0072] 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 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 the rotating blades, which has the characteristics of low power loss and long service life. Since the water pressure chamber is small in size and is filled with clean water, the power required by this part is small, and the consumption of the entire water pump is small.

[0073] Furthermore, the static water pressure chamber blocking anti-sand method can effectively prevent sand from contacting the rotating shaft of the water pump. At the same time, it can also effectively prevent sand from entering the chamber and causing wear on the rotating and static mating surfaces, effectively solving the problem of the lightweight aluminum alloy shell being not wear-resistant and easy to wear under sewage conditions.

[0074] Furthermore, by forming a static pressure chamber during the cutting and rotation process, less pump power is consumed without hindering the water inlet to 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 in the past.

[0075] like Figure 5 As shown, according to one embodiment of the present invention, the stationary cutting member A1 is integrally provided with the housing A, or the stationary cutting member A1 is detachably provided with the housing A. If the stationary cutting member A1 is detachably connected to the housing A, it can be fixed by a threaded connection.

[0076] Through the above arrangement, the integrated arrangement of the stationary cutting member A1 and the housing A effectively ensures the reliability of the connection between the stationary cutting member A1 and the housing A, and further simplifies the structural manufacturing process. Furthermore, 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 cutting efficiency, and the stationary cutting member A1 can also be replaced, thereby improving the maintainability of the present invention.

[0077] Combine 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 removal 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.

[0078] 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.

[0079] 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 for improving its long-term reliable operation in harsh environments and effectively prolonging its service life.

[0080] Combine Figure 2 and 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 this embodiment, the first blade portion 111a11 is arranged at an angle to 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 to 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 this embodiment, the second blade portion 111 a 12 is arranged parallel to the impeller blade 111 .

[0081] Through the above-mentioned arrangement, the second sand-removing blade 111a1 is arranged on the outer edge of the impeller blade 111, so that the second sand-removing blade 111a1 forms a bent surrounding structure on 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. Furthermore, 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 toward the impeller mounting structure B under 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.

[0082] like Figure 2 As shown, according to one embodiment of the present invention, a beveled surface 111a111 is provided at the front end of the first blade portion 111a11 along the rotation direction of the impeller D during operation. The beveled surface 111a111 is provided to reduce the thickness of the front end of the first blade portion 111a11, thereby facilitating the entry of sediment in the water, thereby increasing the effect of collecting sediment in the water, and can also effectively reduce the resistance of the first blade portion 111a11 during rotation, thereby improving the operating efficiency of the present invention.

[0083] Combine Figure 2 and Figure 7 As shown, according to one embodiment of the present invention, a first avoidance groove 111b is provided radially outside the impeller body 11 at the location where the second sand removal blade 111a1 connects to the impeller blade 111. The first avoidance groove 111b extends from the trailing end of the impeller blade 111 toward the leading end of the impeller blade 111 along the direction of operation of the impeller blade 111 (i.e., the direction of rotation of the impeller D during operation). The first avoidance groove 111b has an opening at the trailing end of the impeller blade 111. In this embodiment, the cross-sectional shape of the first avoidance groove 111b can be an arc, a rectangle, a triangle, or the like.

[0084] Through the above-mentioned arrangement, by setting a first avoidance groove 111b on the outer side of the connection position between the impeller blade 111 and the second sand-removing 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 set first avoidance groove 111b, effectively ensuring the service life of the utility model.

[0085] 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, further ensuring the working performance of the present invention.

[0086] 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-removing blades 12 are aligned with the inlet end of the impeller blades 111 in the running direction; in this embodiment, the first sand-removing 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-removing blades 12 protruding radially 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-removing blades 12, and on the other hand, the entangled materials 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-removing blades 12 are integrally arranged with the impeller body 11, or the first sand-removing blades 12 are detachably connected to the impeller body 11.

[0087] Combine Figure 2 and Figure 3 As shown, according to one embodiment of the present invention, an impeller of the present invention includes: an impeller body 11, and a first sand removal blade 12 disposed at one axial end of the impeller body 11; wherein the impeller body 11 is a centrifugal impeller as a whole, and a plurality of impeller blades 111 are disposed circumferentially around the impeller body 11. For example, the impeller blades 111 may be arranged at equal intervals along the circumference of the impeller body 11, and of course, they may be arranged in other numbers (such as three, five, etc.) and may be adjusted according to the specific actual design scheme. In this embodiment, the first sand removal blade 12 is disposed 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, 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 extension of the rotating shaft. To this end, the first sand removal blade 12 may be disposed starting from the edge of the axial hole and extending to the edge position of the water inlet end.

[0088] In this embodiment, the first sand-discharging blades 12 can be configured as elongated blades, extending in a direction aligned with the radial direction of the impeller body 11. Furthermore, multiple first sand-discharging blades 12 are provided at equal intervals along the circumference of the water inlet end. In this embodiment, the number of first sand-discharging blades 12 is the same as the number of impeller blades 111, thereby achieving a corresponding arrangement of the first sand-discharging blades 12 and the impeller blades 111.

[0089] Combine 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.

[0090] Through the above-mentioned setting, based on the one-to-one correspondence between the first sand-removing 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.

[0091] like Figure 2 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 this embodiment, the first blade portion 111a11 is arranged at an angle to 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 to 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 this embodiment, the second blade portion 111 a 12 is arranged parallel to the impeller blade 111 .

[0092] Through the above-mentioned arrangement, the second sand-removing blade 111a1 is arranged on the outer edge of the impeller blade 111, so that the second sand-removing blade 111a1 forms a bent surrounding structure on 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. Furthermore, 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 centrifugal force, thereby effectively reducing the wear between the impeller blade 111 and other structures, and effectively improving the service life of the utility model.

[0093] like Figure 2 As shown, according to one embodiment of the present invention, a beveled surface 111a111 is provided at the front end of the first blade portion 111a11 along the rotation direction of the impeller during operation. The beveled surface 111a111 is provided to reduce the thickness of the front end of the first blade portion 111a11, thereby facilitating the entry of sediment in the water, thereby increasing the effect of collecting sediment in the water, and can also effectively reduce the resistance of the first blade portion 111a11 during rotation, thereby improving the operating efficiency of the present invention.

[0094] like Figure 2 As shown, according to one embodiment of the present invention, a first avoidance groove 111b is provided radially outside the impeller body 11 at the location where the second sand removal blade 111a1 connects to the impeller blade 111. The first avoidance groove 111b extends from the trailing end of the impeller blade 111 toward the leading end of the impeller blade 111 along the direction of operation of the impeller blade 111 (i.e., the direction of rotation of the impeller during operation). The first avoidance groove 111b has an opening at the trailing end of the impeller blade 111. In this embodiment, the cross-sectional shape of the first avoidance groove 111b can be an arc, a rectangle, a triangle, or the like.

[0095] Through the above-mentioned arrangement, by setting a first avoidance groove 111b on the outer side of the connection position between the impeller blade 111 and the second sand-removing 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 set first avoidance groove 111b, effectively ensuring the service life of the utility model.

[0096] Furthermore, along the running direction of the impeller blade 111 (i.e., the rotation direction of the impeller 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, further ensuring the working performance of the present invention.

[0097] Combine 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-removing blades 12 are aligned with the inlet end of the impeller blades 111 in the running direction; in this embodiment, the first sand-removing 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-removing blades 12 protruding radially 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-removing blades 12, and on the other hand, the entangled materials can be cut off by the rotating cutting edges while being conveniently sucked into the impeller blades 111 to achieve rapid discharge.

[0098] The above arrangement effectively ensures that the rotating cutting blades cut the flocculent material and the impeller blades 111 absorb water, ensuring smooth operation of the entire process. In addition, it effectively prevents the rotating cutting blades from further hooking the broken flocculent material after cutting, which is beneficial to ensuring the smooth output of the broken flocculent material.

[0099] like Figure 3 As shown, according to one embodiment of the present invention, the first sand-discharging blades 12 are integrally provided with the impeller body 11 , or the first sand-discharging blades 12 are detachably connected to the impeller body 11 .

[0100] Through the above arrangement, the integrated arrangement of the first sand-discharging blades 12 and the impeller body 11 effectively ensures the reliability of the connection between the first sand-discharging blades 12 and the impeller body 11, and also simplifies the structural manufacturing process. Of course, by making the first sand-discharging blades 12 detachable from the impeller body 11, the position of the first sand-discharging blades 12 can be accurately adjusted during use to optimize cutting efficiency. The first sand-discharging blades 12 can also be replaced to improve the maintainability of the utility model.

[0101] like Figure 3 As shown, according to one embodiment of the present invention, the first sand-discharging blade 12 is a wear-resistant hard steel blade, for example, the first sand-discharging blade 12 is a 2Cr13 material blade;

[0102] 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 for improving its long-term reliable operation in harsh environments and effectively prolonging its service life.

[0103] The above contents are merely examples of specific solutions of the present invention. For devices and structures not described in detail, it should be understood that they can be implemented by adopting common devices and methods available in the art.

[0104] The above description is only one embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection 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 (C); The impeller (D) comprises: an impeller body (11), and a first sand removal blade (12) provided 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 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 (12) are arranged at equal intervals; There is a gap between the first sand removal blade (12) and the end of the shell (A) or they are arranged flush with each other.

2. The permanent magnet frequency conversion 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 portion 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 member (A1) is provided on the edge of one end of the housing (A) opposite to the impeller body (11), and the stationary cutting member (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 frequency conversion 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 frequency conversion 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 frequency conversion 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 portion (111a11) and a second blade portion (111a12); The first blade portion (111a11) is arranged at an angle with the impeller blade (111) on a side of the impeller blade (111) facing 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) provided 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 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 (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 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 portion (111a11) and a second blade portion (111a12); The first blade portion (111a11) is arranged at an angle with the impeller blade (111) on a side of the impeller blade (111) facing 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 connection position between the second sand removal blade (111a1) and 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 provided 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), the rotating cutting edges of at least part 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 provided with the impeller body (11), or the first sand-discharging blade (12) is detachably connected to the impeller body (11).

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