Inverted drainage pump with improved self-priming performance

Abstract

This utility model discloses an inverted drainage pump with improved self-priming performance, comprising a pump cover component, a pump casing component, and a rotor-impeller assembly. The impeller cover of the impeller body component has an impeller suction port at its center, with blades extending into the axial projection position of the impeller suction port, and the blades forming an inclined portion at the axial projection position of the impeller suction port. The rotor chamber of the pump casing component is equipped with an exhaust channel connecting to the outside. When water enters through the inlet of the pump cover component, the air in the rotor chamber of the pump casing component is driven by pressure and discharged to the outside along the exhaust channel. This utility model mainly solves the problem of how to improve the self-priming performance of an inverted drainage pump. When the liquid medium is sucked into the impeller chamber, the air retained in the rotor chamber is driven by pressure and discharged to the outside along the exhaust channel, resulting in a higher negative pressure in the impeller chamber and rotor chamber, thereby improving the self-priming performance of the inverted drainage pump.

Description

Technical Field

[0001] This utility model relates to the field of electronic water pump technology, specifically to an inverted drainage pump with improved self-priming performance. Background Technology

[0002] Electric water pumps have high output efficiency and can achieve precise flow control. Therefore, they are widely used in household appliances, automobiles and industrial equipment. For example, household appliances such as water-heated mattresses, air conditioners and humidifiers are increasingly equipped with electric water pumps to achieve precise quantitative circulation / discharge of liquid media.

[0003] The rotor-impeller assembly is one of the core components of an electric water pump. It includes at least a rotor support, a magnetic ring sleeved on the rotor support, and an impeller disposed at one end of the rotor support. When the stator assembly of the electric water pump is energized, it can generate a rotating magnetic field. The magnetic ring of the rotor-impeller assembly is driven by the magnetic coupling of this rotating magnetic field and can rotate in the rotor cavity of the electric water pump, thereby driving the rotor support and the impeller to rotate together. The rotating impeller can drive the liquid medium to flow in a directional manner, thus completing the basic function of the electric water pump. The publication text of Chinese utility model patent with publication number CN118934646A, and the announcement texts of Chinese utility model patents with announcement numbers CN222162941U, CN220470281U, and CN220227266U all disclose the structure of a typical rotor-impeller assembly.

[0004] However, although the rotor-impeller assembly described above has undergone some optimization of its impeller structure (including the structure of the impeller body and the blades) to make it suitable for driving the flow of liquid media, it has generally failed to optimize for self-priming performance, making it difficult to meet the performance requirements of self-priming water pumps (such as inverted drainage pumps).

[0005] Furthermore, existing inverted drainage pumps lack sufficient self-priming capability, resulting in air remaining in the outlet pipe and pump chamber. If the outlet pipe and pump chamber are not filled with water, or if the air in the outlet pipe and pump chamber is not evacuated, the vacuum in the pump chamber will be insufficient, making it difficult for the inverted drainage pump to draw water.

[0006] The usual solution to the above problem is to continue filling with water or to remove the air from the inlet pipe. However, these operations require certain professional training or specialized equipment, which is difficult for some users to perform.

[0007] In conclusion, improving the self-priming performance of inverted drainage pumps has become an urgent problem to be solved. Utility Model Content

[0008] The purpose of this invention is to provide an inverted drainage pump with improved self-priming performance, which has good self-priming properties.

[0009] To achieve the above objectives, this utility model provides the following technical solution: an inverted drainage pump with improved self-priming performance, comprising at least a pump cover component, a pump casing component, and a rotor-impeller assembly; an impeller chamber is formed on the inner side of the pump cover component, and an inlet and an outlet communicating with the inner and outer sides of the impeller chamber are respectively formed on the pump cover component; a rotor chamber is formed in the pump casing component, and the pump cover component covers the pump casing component, so that the impeller chamber of the pump cover component and the rotor chamber of the pump casing component are interconnected; the rotor-impeller assembly comprises at least an impeller support component and an impeller body component; the impeller support component is at least provided with an impeller mounting platform portion; the impeller body component includes an impeller cover, and a plurality of blades formed on the inner side of the impeller cover; The impeller cover of the impeller body component has an impeller suction port at its center. The blades extend into the axial projection position of the impeller suction port, and the blades form an inclined portion at the axial projection position of the impeller suction port. The blades of the impeller body component are fixed at the impeller mounting platform of the impeller support component. The rotor-impeller assembly is supported in the impeller chamber of the pump cover component and the rotor chamber of the pump casing component, so that the rotor-impeller assembly can rotate in the impeller chamber and the rotor chamber. The rotor chamber of the pump casing component is provided with an exhaust channel communicating with the outside. When water enters through the inlet of the pump cover component, the air in the rotor chamber of the pump casing component is driven by pressure and discharged to the outside along the exhaust channel.

[0010] In the above technical solution, the angle θ between the tilted portion of the blade and the central axis of the impeller body component is 30° to 40°.

[0011] In the above technical solution, the rotor-impeller assembly further includes a permanent magnet component and a bearing component; the impeller support component is also configured with a permanent magnet-bearing mounting portion coaxially connected to the impeller mounting platform portion; the permanent magnet component is coaxially sleeved on the permanent magnet-bearing mounting portion of the impeller support component; the bearing component is coaxially embedded in the permanent magnet-bearing mounting portion of the impeller support component.

[0012] In the above technical solution, a plurality of flow channels are provided at the permanent magnet-bearing mounting part of the impeller support component; the flow channels penetrate the permanent magnet-bearing mounting part of the impeller support component in the axial direction.

[0013] In the above technical solution, the impeller cover of the impeller body component has a clearance portion formed in the gap between each blade; the impeller mounting platform of the impeller support component has a plurality of flow holes; the flow holes at the impeller mounting platform are aligned with the clearance portion at the impeller cover.

[0014] In the above technical solution, the inverted drainage pump of this utility model with improved self-priming performance further includes a shaft core; a shaft core support is formed in the rotor chamber of the pump casing component, and a shaft core bracket is formed on the inner side of the pump cover component at the water inlet; the shaft core support of the pump casing component and the shaft core bracket of the pump cover component are aligned with each other; at least a portion of the shaft core is supported at the shaft core support of the pump casing component, and at least another portion is supported at the shaft core bracket of the pump cover component; the rotor-impeller assembly is sleeved on the shaft core, and the rotor-impeller assembly is adapted to rotate about the shaft core as an axis.

[0015] In the above technical solution, the inverted drainage pump with improved self-priming performance of this utility model further includes a stator assembly, a drive circuit board, and a rear end cover component; the stator assembly is disposed in the pump casing component and located outside the rotor chamber of the pump casing component, and the permanent magnet component of the stator assembly and the rotor-impeller assembly are aligned with each other in the radial direction; the drive circuit board is disposed in the pump casing component and electrically connected to the stator assembly; the rear end cover component is fixed at the other end of the pump casing component relative to the pump cover component to shield the stator assembly and the drive circuit board.

[0016] In the above technical solution, the pump cover component has an outwardly raised portion; the water inlet of the pump cover component is opened at the raised portion; at least a portion of the impeller suction port of the rotor-impeller assembly extends into the raised portion of the pump cover component, and the impeller suction port of the rotor-impeller assembly and the water inlet of the pump cover component are aligned with each other in the axial direction.

[0017] In the above technical solution, the lifting height h of the raised portion relative to the outer surface of the pump cover component is 2mm to 5mm.

[0018] In the above technical solution, the raised part of the pump cover component is provided with several side water inlet grooves at its end face.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] The improvements in the hydrodynamic performance of this inverted drainage pump with enhanced self-priming performance include at least the following:

[0021] 1. In the rotor-impeller assembly, the blades extend into the axial projection position of the impeller suction port, and the blades form an inclined section at the axial projection position of the impeller suction port, so that when the rotor-impeller assembly rotates, the negative pressure inside the impeller suction port is higher, thereby improving the self-priming performance of the inverted drainage pump.

[0022] 2. When the liquid medium is drawn into the impeller chamber, the air trapped in the rotor chamber is discharged to the outside through the exhaust channel under pressure, which makes the negative pressure of the impeller chamber and the rotor chamber higher, thereby improving the self-priming performance of the inverted drainage pump. It can be used normally without filling with water or removing the air from the rotor chamber.

[0023] 3. In the rotor-impeller assembly, several flow channels are provided at the permanent magnet-bearing mounting part of the impeller support component, and the flow channels pass through the permanent magnet-bearing mounting part of the impeller support component in the axial direction, so that the liquid medium can pass through the flow channels to quickly fill the rotor chamber, avoid air retention in the rotor chamber, and make the negative pressure of the impeller chamber and rotor chamber higher, which can also improve the self-priming performance of the inverted drainage pump.

[0024] 4. In the rotor-impeller assembly, the impeller cover of the impeller body component has a clearance portion formed in the gap between each blade. Together with the flow passage at the impeller mounting platform, it can reduce the eddy currents generated by the rotor-impeller assembly when rotating at high speed, thereby reducing high-frequency noise and improving the quiet performance of the inverted drainage pump.

[0025] 5. The pump cover component has an outwardly raised portion, and the water inlet of the pump cover component is opened at the raised portion. Compared with the existing electronic water pump (the water inlet is configured as a short pipe), the inverted drainage pump of this utility model with improved self-priming performance has a shorter distance between the water inlet and the impeller chamber, making it easier for the liquid medium to be sucked into the impeller chamber.

[0026] 6. The pump cover component has an outwardly raised portion, and at least a portion of the suction port of the rotor-impeller assembly extends into the raised portion of the pump cover component. Furthermore, the suction port of the rotor-impeller assembly and the water inlet of the pump cover component are aligned with each other in the axial direction, so that the distance between the suction port and the water inlet of the rotor-impeller assembly is shorter, making it easier for the liquid medium to be sucked into the impeller chamber.

[0027] 7. The raised part of the pump cover component is equipped with several side water inlet grooves at its end face, so that the liquid medium can also enter the water inlet from the side, making it easier for the liquid medium to be sucked into the impeller chamber. Attached Figure Description

[0028] Figure 1This is a perspective view of the present invention.

[0029] Figure 2 This is an exploded view of the present invention.

[0030] Figure 3 This is a cross-sectional view of the present invention.

[0031] Figure 4 This is a perspective view of the rotor-impeller assembly in this utility model.

[0032] Figure 5 This is an exploded view of the rotor-impeller assembly in this utility model.

[0033] Figure 6 This is a cross-sectional view of the rotor-impeller assembly in this utility model.

[0034] The attached figures are labeled as follows: 1. Pump cover component; 11. Impeller chamber; 12. Inlet; 13. Outlet; 14. Shaft support; 15. Lifted portion; 151. Side inlet groove; 2. Pump casing component; 21. Rotor chamber; 22. Exhaust passage; 23. Shaft support; 3. Rotor-impeller assembly; 31. Impeller support component; 311. Impeller mounting platform portion; 3111. Blade groove; 3112. Positioning column; 3 113. Flow hole; 312. Permanent magnet-bearing mounting part; 3121. Flow channel; 32. Impeller body component; 321. Impeller cover; 3211. Impeller suction port; 3212. Clearance part; 322. Blade; 3221. Inclined part; 3222. Positioning hole; 33. Permanent magnet component; 34. Bearing component; 4. Stator assembly; 5. Drive circuit board; 6. Shaft core; 7. Rear end cover component. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] This embodiment provides an inverted drain pump with improved self-priming performance, which can be used to discharge liquid media from structures such as water tanks and troughs to other places.

[0037] Please see Figures 1-6 The inverted drainage pump with improved self-priming performance in this embodiment includes at least a pump cover component 1, a pump casing component 2, and a rotor-impeller assembly 3.

[0038] The pump cover component 1 is an integrally formed cover-shaped component made of engineering plastic or metal, while the pump shell component 2 is an integrally formed semi-shell component made of engineering plastic or metal, which provides a structural support foundation for the inverted drainage pump with improved self-priming performance in this embodiment.

[0039] An impeller chamber 11 is formed on the inner side of the pump cover component 1. Furthermore, an inlet 12 and an outlet 13 are formed on the pump cover component 1, which connect the inner and outer sides of the impeller chamber 11. Specifically, the impeller chamber 11 is a cavity inside the pump cover component 1, the inlet 12 is a hole-like structure integrally formed on the pump cover component 1, and the outlet 13 is a short tubular structure integrally formed on the pump cover component 1.

[0040] A rotor chamber 21 is formed within the pump casing component 2. The rotor chamber 21 is a cavity structure integrally formed with the pump casing component 2. The pump cover component 1 covers the pump casing component 2, so that the impeller chamber 11 of the pump cover component 1 and the rotor chamber 21 of the pump casing component 2 are interconnected. It can be understood that the pump cover component 1 and the pump casing component 2 can be fixed together by means of screws or clips, and a sealing ring is provided at the joint between the two to achieve sealing.

[0041] Please see Figures 4-6 The rotor-impeller assembly 3 includes at least an impeller support component 31 and an impeller body component 32.

[0042] The impeller support component 31 is an integrally injection-molded support-shaped component made of engineering plastic, which is used to provide an overall structural support foundation and functional support foundation for the rotor-impeller assembly 3; the impeller body component 32 is an integrally injection-molded cover-shaped component made of engineering plastic, which is used to drive the flow of liquid medium during rotation.

[0043] The impeller support component 31 is equipped with at least an impeller mounting platform portion 311, which is actually a circular platform-shaped structure.

[0044] The impeller body component 32 includes an impeller cover 321 and a plurality of blades 322 formed inside the impeller cover 321; wherein the impeller cover 321 has a circular cover-like structure and the blades 322 have an arc-shaped sheet-like structure.

[0045] The impeller cover 321 of the impeller body component 32 has an impeller suction port at its center. The blades 322 extend into the axial projection position of the impeller suction port, and the blades 322 form an inclined portion 3221 at the axial projection position of the impeller suction port. It should be noted that the impeller suction port is a circular hole structure integrally injection molded with the impeller body component 32, and the inclined portion 3221 is also integrally injection molded with each blade 322 of the impeller body component 32.

[0046] The blades 322 of the impeller body component 32 are fixed to the impeller mounting platform portion 311 of the impeller support component 31.

[0047] The rotor-impeller assembly 3 is supported in the impeller chamber 11 of the pump cover component 1 and the rotor chamber 21 of the pump casing component 2, so that the rotor-impeller assembly 3 can rotate in the impeller chamber 11 and the rotor chamber 21.

[0048] An exhaust passage 22 connecting to the outside is provided at the rotor chamber 21 of the pump casing component 2.

[0049] When water enters through the inlet 12 of the pump cover component 1, the air in the rotor chamber 21 of the pump casing component 2 is discharged to the outside through the exhaust channel 22 under pressure.

[0050] Specifically, the rotor-impeller assembly 3 further includes a permanent magnet component 33 and a bearing component 34; wherein, the permanent magnet component 33 is a magnetic metal ring that can couple with the rotating magnetic field generated by the stator assembly 4 to drive the rotor-impeller assembly 3 to rotate; the bearing component 34 is one of a ceramic bearing, a graphite bearing, and a metal bushing, and has self-lubricating properties; the impeller support component 31 is also equipped with a permanent magnet-bearing mounting portion 312 coaxially connected to the impeller mounting platform portion 311. In fact, the permanent magnet-bearing mounting portion 312 has a cylindrical structural feature and is integrally injection molded with the impeller mounting platform portion 311; the permanent magnet component 33 is coaxially sleeved on the permanent magnet-bearing mounting portion 312 of the impeller support component 31; the bearing component 34 is coaxially embedded in the permanent magnet-bearing mounting portion 312 of the impeller support component 31.

[0051] Furthermore, a plurality of flow channels 3121 are provided at the permanent magnet-bearing mounting portion 312 of the impeller support component 31, and the flow channels 3121 penetrate the permanent magnet-bearing mounting portion 312 of the impeller support component 31 in the axial direction; in fact, the flow channels 3121 and the permanent magnet-bearing mounting portion 312 of the impeller support component 31 are integrally injection molded; in this embodiment, the flow channels 3121 are evenly distributed in a strip along the circumferential direction of the permanent magnet-bearing mounting portion 312.

[0052] Furthermore, the impeller cover 321 of the impeller body component 32 has a clearance portion 3212 formed in the gap between each blade 322. In fact, the clearance portion 3212 is a notch-shaped structural feature integrally injection molded with the impeller body component 32.

[0053] Furthermore, the impeller mounting platform portion 311 of the impeller support component 31 is provided with a plurality of flow holes 3113. In fact, the flow holes 3113 are integrally injection molded with the impeller support component 31. The flow holes 3113 at the impeller mounting platform portion 311 are aligned with the clearance portion 3212 at the impeller cover 321. Specifically, the two are aligned with each other in the axial direction.

[0054] More specifically, the impeller mounting platform portion 311 of the impeller support component 31 is provided with a number of blade grooves 3111. In fact, the blade grooves 3111 are arc-shaped groove structures integrally injection molded with the impeller support component 31, and their shapes match those of the blades 322 of the impeller body component 32. The blades 322 of the impeller body component 32 are fixed to the blade grooves 3111 of the impeller mounting platform portion 311 by ultrasonic welding.

[0055] Furthermore, the impeller support component 31 has a positioning post 3112 formed in the blade groove 3111. In fact, the positioning post 3112 is a circular columnar structure integrally injection molded with the impeller support component 31. The blade 322 of the impeller body component 32 has a positioning hole 3222 formed at its end face. In fact, the positioning hole 3222 is a hole-like structure integrally injection molded with the impeller body component 32. The positioning post 3112 of the impeller support component 31 is inserted into the positioning hole 3222 of the impeller body component 32.

[0056] As shown in the figure, the angle θ between the tilting portion 3221 of the blade 322 and the central axis of the impeller body component 32 is 30° to 40°. In this embodiment, the angle θ between the tilting portion 3221 of the blade 322 and the central axis of the impeller body component 32 is 35°.

[0057] In this embodiment, the rotor-impeller assembly 3 is manufactured by first prefabricating a permanent magnet component 33 and a bearing component 34; then placing the permanent magnet component 33 and the bearing component 34 into a molding die of the impeller support component 31, injecting plastic material into the molding die, and demolding the plastic material after it cools and solidifies, thus obtaining the assembly of the impeller support component 31, the permanent magnet component 33, and the bearing component 34; finally, using ultrasonic welding, the blades 322 of the impeller body component 32 are fixed in the blade slots 3111 of the impeller mounting platform portion 311 (during this process, the positioning pins 3112 of the impeller support component 31 are inserted into the positioning holes 3222 of the impeller body component 32, which serve to prevent mistaken identity and provide positioning), thus completing the manufacturing process of the rotor-impeller assembly 3.

[0058] Please see Figures 1-3Specifically, the inverted drainage pump with improved self-priming performance in this embodiment also includes a shaft core 6, which is a cylindrical metal shaft; a shaft core support 23 is formed in the rotor chamber 21 of the pump casing component 2 (the shaft core support 23 is integrally formed at the bottom of the rotor chamber 21), and a shaft core bracket 14 is formed inside the inlet 12 of the pump cover component 1 (the shaft core bracket 14 is integrally formed inside the pump cover component 1); the shaft core support 23 of the pump casing component 2 and the shaft core bracket 14 of the pump cover component 1 are aligned with each other; at least a portion of the shaft core 6 is supported by the shaft core support 2 of the pump casing component 2. At least one other part of the shaft core 6 is supported at the shaft core bracket 14 of the pump cover component 1. In this embodiment, the two ends of the shaft core 6 are respectively inserted and fixed in the shaft core support 23 of the pump housing component 2 and the shaft core bracket 14 of the pump cover component 1. The shaft core 6 is fixed in the circumferential direction by means of irregular fit. The rotor-impeller assembly 3 is sleeved on the shaft core 6. The rotor-impeller assembly 3 is adapted to rotate about the shaft core 6. In this embodiment, the bearing component 34 of the rotor-impeller assembly 3 is sleeved on the shaft core 6, so that the rotor-impeller assembly 3 is adapted to rotate about the shaft core 6.

[0059] Specifically, the inverted drainage pump with improved self-priming performance in this embodiment further includes a stator assembly 4, a drive circuit board 5, and a rear end cover component 7; the stator assembly 4 includes at least a stator support (also known as a "stator core") and enameled wire coils wound on the stator support, which can generate a rotating magnetic field during operation to drive the rotor-impeller assembly 3 to rotate; the drive circuit board 5 is a printed circuit board (PCB), which carries the main control, power electronic devices for driving the operation of the stator assembly 4, and necessary peripheral circuits for driving the operation of the stator assembly 4; the rear end cover component 7 is a one-piece molded cover-shaped component made of engineering plastic or metal; the stator assembly 4 is disposed in the pump housing component 2 and located outside the rotor chamber 21 of the pump housing component 2, and the permanent magnet component 33 of the stator assembly 4 and the rotor-impeller assembly 3 are aligned with each other in the radial direction. In this embodiment, the stator... Component 4 is sleeved outside the rotor chamber 21 of the pump housing component 2. It can be fixed in the pump housing component 2 by snap-fit ​​or screw-fit. The drive circuit board 5 is disposed in the pump housing component 2 and electrically connected to the stator component 4. In fact, the drive circuit board 5 can be fixed in the pump housing component 2 by snap-fit ​​or screw-fit. In some possible embodiments, the end of the enameled wire coil of the stator component 4 is provided with a terminal, which is soldered to the drive circuit board 5 to realize the electrical connection between the stator component 4 and the drive circuit board 5. The rear end cover component 7 is fixed at the other end of the pump housing component 2 relative to the pump cover component 1 to shield the stator component 4 and the drive circuit board 5. It can be understood that the rear end cover component 7 and the pump housing component 2 can be fixed together by screws or snap-fit, and a sealing ring is provided at the joint between the two to achieve a seal.

[0060] Furthermore, a raised portion 15 that is pulled outward is formed at the pump cover component 1. In fact, the raised portion 15 is a platform-shaped structure integrally formed with the pump cover component 1, and the corresponding position of the raised portion 15 on the inner side of the pump cover component 1 is a groove-shaped structure. The water inlet 12 of the pump cover component 1 is opened at the raised portion 15. The impeller suction port of the rotor-impeller assembly 3 extends at least a portion into the raised portion 15 of the pump cover component 1, and the impeller suction port of the rotor-impeller assembly 3 and the water inlet 12 of the pump cover component 1 are aligned with each other in the axial direction.

[0061] Furthermore, the lifting height h of the raised portion 15 relative to the outer surface of the pump cover component 1 is 2mm to 5mm. In this embodiment, the lifting height h of the raised portion 15 relative to the outer surface of the pump cover component 1 is 3.2mm.

[0062] Furthermore, the raised portion 15 of the pump cover component 1 has several side water inlet grooves 151 at its end face. In fact, the side water inlet grooves 151 are groove-shaped structural features integrally formed with the raised portion 15, and they connect the water inlet 12 and the outside from the side.

[0063] It should be noted that the exhaust channel 22 is a short tubular structure integrally formed in the rotor chamber 21 of the pump housing component 2, specifically located at the top of the rotor chamber 21; the exhaust channel 22 passes through the pump housing component 2 until it reaches the vicinity of the inner wall of the rear end cover component 7; a through hole is provided in the rear end cover component 7 so that the exhaust channel 22 can communicate with the outside air.

[0064] This embodiment of the inverted drainage pump with improved self-priming performance utilizes an external power supply connected to the drive circuit board 5. The drive circuit board 5 energizes the enameled wire coil of the stator assembly 4. After the enameled wire coil is energized, an alternating magnetic field is generated. Guided by the stator support (stator core), a rotating magnetic field is generated in the rotor chamber 21. This rotating magnetic field is located in the rotor chamber 21. The permanent magnet component 33 of the rotor-impeller assembly 3 in the rotor chamber 21 is magnetically coupled to this rotating magnetic field, causing the entire rotor-impeller assembly 3 to start rotating. When the impeller body component 32 in the impeller chamber 11 rotates, a directional pressure difference is generated in the impeller chamber 11, thereby driving the liquid medium to be drawn into the impeller chamber 11 from the inlet 12 and discharged from the outlet 13, thus completing the function of the water pump.

[0065] The inverted drainage pump in this embodiment, which improves self-priming performance, includes at least the following improvements in hydrodynamic performance:

[0066] 1. In the rotor-impeller assembly 3, the blades 322 extend into the axial projection position of the impeller suction port, and the blades 322 form an inclined portion 3221 at the axial projection position of the impeller suction port, so that when the rotor-impeller assembly 3 rotates, the negative pressure inside the impeller suction port is higher, thereby improving the self-priming performance of the inverted drainage pump.

[0067] 2. When the liquid medium is drawn into the impeller chamber 11, the air trapped in the rotor chamber 21 is discharged to the outside through the exhaust channel 22 under pressure, which makes the negative pressure of the impeller chamber 11 and the rotor chamber 21 higher, thereby improving the self-priming performance of the inverted drainage pump. It can be used normally without filling with water or evacuating the air in the rotor chamber 21.

[0068] 3. In the rotor-impeller assembly 3, several flow channels 3121 are provided at the permanent magnet-bearing mounting part 312 of the impeller support component 31. The flow channels 3121 pass through the permanent magnet-bearing mounting part 312 of the impeller support component 31 in the axial direction, so that the liquid medium can pass through the flow channels 3121 to quickly fill the rotor chamber 21, avoid air retention in the rotor chamber 21, and make the negative pressure of the impeller chamber 11 and the rotor chamber 21 higher, which can also improve the self-priming performance of the inverted drainage pump.

[0069] 4. In the rotor-impeller assembly 3, the impeller cover 321 of the impeller body component 32 has a clearance portion 3212 formed in the gap between each blade 322. Together with the flow passage 3113 at the impeller mounting platform portion 311, it can reduce the eddy current generated by the rotor-impeller assembly 3 when rotating at high speed, thereby reducing high frequency noise and improving the quiet performance of the inverted drainage pump.

[0070] 5. A raised portion 15 that is pulled outward is formed at the pump cover component 1. The water inlet 12 of the pump cover component 1 is opened at the raised portion 15. Compared with the electronic water pump in the prior art (the water inlet 12 is configured as a short pipe), the inverted drainage pump with improved self-priming performance in this embodiment has a shorter distance between the water inlet 12 and the impeller chamber 11, making it easier for the liquid medium to be sucked into the impeller chamber 11.

[0071] 6. A raised portion 15 that is pulled outward is formed at the pump cover component 1. At least a portion of the suction port 3211 of the rotor-impeller assembly 3 extends into the raised portion 15 of the pump cover component 1. Furthermore, the suction port 3211 of the rotor-impeller assembly 3 and the water inlet 12 of the pump cover component 1 are aligned with each other in the axial direction, so that the distance between the suction port 3211 of the rotor-impeller assembly 3 and the water inlet 12 is shorter, making it easier for the liquid medium to be sucked into the impeller chamber 11.

[0072] 7. The raised part 15 of the pump cover component 1 has several side water inlet grooves 151 at its end face, so that the liquid medium can also enter the water inlet 12 from the side, thereby making it easier for the liquid medium to be sucked into the impeller chamber 11.

[0073] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An inverted drainage pump with improved self-priming performance, characterized in that, It includes at least a pump cover component, a pump casing component, and a rotor-impeller assembly; An impeller chamber is formed on the inner side of the pump cover component, and an inlet and an outlet are respectively formed on the pump cover component to connect the inner and outer sides of the impeller chamber. A rotor chamber is formed in the pump casing component, and the pump cover component covers the pump casing component, so that the impeller chamber of the pump cover component and the rotor chamber of the pump casing component are in communication with each other. The rotor-impeller assembly includes at least an impeller support component and an impeller body component; The impeller support component is at least equipped with an impeller mounting platform portion; The impeller body component includes an impeller cover and a plurality of blades formed inside the impeller cover; The impeller cover of the impeller body component has an impeller inlet at its center. The blades extend into the axial projection position of the impeller inlet, and the blades form an inclined portion at the axial projection position of the impeller inlet. The blades of the impeller body component are fixed at the impeller mounting platform portion of the impeller support component. The rotor-impeller assembly is supported in the impeller chamber of the pump cover member and the rotor chamber of the pump casing member, so that the rotor-impeller assembly can rotate in the impeller chamber and the rotor chamber; The rotor chamber of the pump casing component is provided with an exhaust passage that connects to the outside. When water enters through the inlet of the pump cover component, the air in the rotor chamber of the pump casing component is discharged to the outside through the exhaust channel under pressure.

2. The inverted drainage pump with improved self-priming performance according to claim 1, characterized in that, The angle θ between the inclined portion of the blade and the central axis of the impeller body component is 30° to 40°.

3. The inverted drainage pump with improved self-priming performance according to claim 1, characterized in that, The rotor-impeller assembly also includes permanent magnet components and bearing components; The impeller support component is also equipped with a permanent magnet-bearing mounting part that is coaxially connected to the impeller mounting platform portion; The permanent magnet component is coaxially fitted onto the permanent magnet-bearing mounting portion of the impeller support component; The bearing component is coaxially embedded in the permanent magnet-bearing mounting portion of the impeller support component.

4. The inverted drainage pump with improved self-priming performance according to claim 3, characterized in that, The impeller support component has several flow channels at the permanent magnet-bearing mounting part. The flow passage extends axially through the permanent magnet-bearing mounting portion of the impeller support component.

5. The inverted drainage pump of claim 1, wherein, The impeller cover of the impeller body component has an air-proof portion formed in the gap between each of the blades; The impeller mounting platform portion of the impeller support component is provided with several flow holes; The flow hole at the impeller mounting platform is aligned with the clearance portion at the impeller cover.

6. The inverted drainage pump with improved self-priming performance according to any one of claims 1-5, characterized in that, It also includes the shaft core; A shaft support is formed in the rotor chamber of the pump casing component, and a shaft bracket is formed inside the water inlet of the pump cover component. The shaft support of the pump casing component and the shaft bracket of the pump cover component are aligned with each other. The shaft core, at least a portion of which is supported at the shaft core support of the pump housing component, and at least another portion of which is supported at the shaft core bracket of the pump cover component; The rotor-impeller assembly is sleeved on the shaft core, and the rotor-impeller assembly is adapted to rotate about the shaft core as an axis.

7. The inverted drainage pump of claim 3, wherein, It also includes the stator assembly, drive circuit board, and rear cover assembly; The stator assembly is disposed within the pump casing component and located outside the rotor chamber of the pump casing component. The stator assembly and the permanent magnet component of the rotor-impeller assembly are aligned with each other in the radial direction. The drive circuit board is disposed in the pump housing component and is electrically connected to the stator assembly; The rear end cover component is fixed to the other end of the pump housing component relative to the pump cover component to shield the stator assembly and the drive circuit board.

8. The inverted drainage pump with improved self-priming performance according to any one of claims 1-5, characterized in that, The pump cover component has an outwardly raised portion; The water inlet of the pump cover component is located at the raised portion; The impeller inlet of the rotor-impeller assembly extends at least a portion into the raised portion of the pump cover member, and the impeller inlet of the rotor-impeller assembly and the inlet of the pump cover member are aligned with each other in the axial direction.

9. The inverted drainage pump with improved self-priming performance according to claim 8, characterized in that, The lifting height h of the raised portion relative to the outer surface of the pump cover component is 2mm to 5mm.

10. The inverted drainage pump of claim 8, wherein, The raised portion of the pump cover component has several side water inlet grooves at its end face.

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