Water inlet structure of water pump and inverted drainage pump using same

Abstract

The utility model discloses a water inlet structure of a water pump and an inverted drainage pump applying the water inlet structure, and relates to the technical field of water pumps and parts of the water pumps, and the water pump at least comprises a pump cover and a rotor-impeller assembly; an impeller cavity is formed in the inner side of the pump cover, and a water inlet pipe and a water outlet pipe communicating with the inner side and the outer side of the impeller cavity are formed on the pump cover; the rotor-impeller assembly at least comprises a main impeller capable of rotating in an impeller cavity of the pump cover and a water inlet impeller capable of rotating in a water inlet pipe of the pump cover. A water inlet grating is formed on the side face of the water inlet pipe of the pump cover, and the water inlet grating of the pump cover and the water inlet impeller of the rotor-impeller assembly are mutually aligned in the radial direction. The utility model mainly solves the problem of how to provide a water inlet structure with a self-suction function for the inverted drainage pump. The water inlet structure with the self-suction function is provided for the inverted drainage pump, and the inverted drainage pump can be normally used without water filling or completely pumping air in the rotor cavity.

Description

Technical Field

[0001] The utility model relates to the technical field of water pumps and their components, and particularly to an inlet structure of a water pump and an inverted drainage pump applying the same. Background Art

[0002] An electronic water pump has a high output efficiency and can achieve precise flow control. Therefore, electronic water pumps are widely used in household appliances, automobiles, and industrial equipment. For example, household appliances such as water heating mattresses, air conditioners, and humidifying appliances are increasingly equipped with electronic water pumps in order to achieve precise quantitative liquid circulation / discharge functions.

[0003] A drainage pump is an important application of an electronic water pump, which can discharge the liquid in structures such as water tanks and water troughs to other places.

[0004] The centrifugal drainage pump in the prior art lacks a self-priming function. When the centrifugal drainage pump is inverted, air will remain in its outlet pipe and pump chamber. If the outlet pipe and pump chamber are not filled with water, or the air in the outlet pipe and pump chamber is not exhausted, the vacuum degree in the pump chamber will be insufficient, resulting in difficulty for the centrifugal drainage pump to absorb water.

[0005] The common solutions to the above problems are to continue filling water or exhausting the air in the inlet pipe. However, the above operations require certain professional training or special equipment, which are difficult for some users to achieve.

[0006] In summary, how to provide an inlet structure with a self-priming function for an inverted drainage pump has become one of the problems to be solved urgently. Summary of the Utility Model

[0007] The purpose of the utility model is to provide an inlet structure of a water pump and an inverted drainage pump applying the same, which has a self-priming function.

[0008] To achieve the above purpose, the utility model provides the following technical solution: An inlet structure of a water pump, the water pump at least includes a pump cover and a rotor-impeller assembly; an impeller chamber is formed inside the pump cover, and an inlet pipe and an outlet pipe communicating with the inside and outside of the impeller chamber are respectively formed on the pump cover; the rotor-impeller assembly at least includes a main impeller capable of rotating in the impeller chamber of the pump cover, and an inlet impeller capable of rotating in the inlet pipe of the pump cover; an inlet grille is formed on the side of the inlet pipe of the pump cover, and the inlet grille of the pump cover is radially aligned with the inlet impeller of the rotor-impeller assembly.

[0009] In the above technical solution, the water inlet pipe of the pump cover includes an outer water inlet pipe and an inner water inlet pipe which are coaxially arranged from outside to inside; the water inlet grille of the pump cover includes an outer water inlet grille arranged at the outer water inlet pipe and an inner water inlet grille arranged at the inner water inlet pipe.

[0010] In the above technical solution, the blades of the water inlet impeller are one of fan-shaped blades, spiral blades and paddle-shaped blades.

[0011] An inverted drainage pump includes the water inlet structure of the above-mentioned water pump.

[0012] In the above technical solution, the inverted drainage pump of the present invention further includes a pump housing, a stator assembly, a drive circuit board and a rear end cover; a rotor chamber is formed in the pump housing, and the pump cover is closed on the pump housing so that the impeller chamber of the pump cover communicates with the rotor chamber of the pump housing; the rotor-impeller assembly includes a rotating shaft, a rotor bracket, a magnetic ring, the main impeller and the water inlet impeller; the rotating shaft is supported by the pump housing and the pump cover and penetrates through the rotor chamber of the pump housing and the impeller chamber of the pump cover until it reaches the water inlet pipe of the pump cover; the rotor bracket is sleeved on the rotating shaft and rotates with the rotating shaft, the magnetic ring is sleeved on the rotor bracket and is coaxially arranged with the rotor bracket, the main impeller is fixed at one end of the rotor bracket and is coaxially arranged with the rotor bracket; the water inlet impeller is sleeved on a section of the rotating shaft located in the water inlet pipe and rotates with the rotating shaft; the stator assembly is arranged in the pump housing and is located outside the rotor chamber of the pump housing, and the stator assembly and the magnetic ring of the rotor-impeller assembly are radially aligned with each other; the drive circuit board is arranged in the pump housing and is electrically connected to the stator assembly; the rear end cover is fixed at the other end of the pump housing relative to the pump cover to shield the stator assembly and the drive circuit board.

[0013] In the above technical solution, a rotating shaft seat is formed in the rotor chamber of the pump housing, a rotating shaft bracket is formed on the inner side of the water inlet pipe of the pump cover, and the rotating shaft seat of the pump housing is aligned with the rotating shaft bracket of the pump cover; at least a part of the rotating shaft of the rotor-impeller assembly is supported at the rotating shaft seat of the pump housing through a first bearing, and at least another part of it is supported at the rotating shaft bracket of the pump cover through a second bearing.

[0014] In the above technical solution, an exhaust passage is provided between the rotor chamber of the pump housing and the water outlet pipe of the pump cover; when water enters through the water inlet pipe of the pump cover, the air in the rotor chamber of the pump housing is driven by pressure, reaches the water outlet pipe of the pump cover along the exhaust passage, and is discharged outside the water outlet pipe.

[0015] In the above technical solution, the inverted drainage pump of the present utility model further includes an independent exhaust pipe; an exhaust inlet branch pipe is formed at the rotor chamber of the pump housing, and an intermediate exhaust pipe is also formed at the pump housing; an exhaust outlet branch pipe is formed at the water outlet pipe of the pump cover; the exhaust inlet branch pipe of the pump housing, the independent exhaust pipe, the intermediate exhaust pipe of the pump housing, and the exhaust outlet branch pipe of the pump cover are sequentially communicated to form the exhaust passage.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows: The water inlet structure of the water pump of the present utility model and the inverted drainage pump applying the same. Its rotor-impeller assembly includes a water inlet impeller that can rotate in the water inlet pipe of the pump cover. The rotating water inlet impeller can suck the liquid at the water inlet pipe into the impeller chamber, and then form a stable water flow under the drive of the main impeller. Even if the liquid level is relatively shallow, as long as the liquid level can contact the water inlet impeller, it can operate normally without completing the initial water supply; a water inlet grille that is radially aligned with the water inlet impeller is formed on the side of the water inlet pipe of the pump cover, which is conducive to the liquid entering the water inlet pipe and contacting the water inlet impeller; the water inlet structure of the water pump of the present utility model and the inverted drainage pump applying the same provide a water inlet structure with a self-priming function for the inverted drainage pump, and it can be used normally without filling water or exhausting the air in the rotor chamber. Description of the Drawings

[0017] Figure 1 It is a three-dimensional view of the present utility model.

[0018] Figure 2 It is an exploded view of the present utility model.

[0019] Figure 3 It is a sectional view of the present utility model.

[0020] The reference numerals are: 1, pump cover; 11, water inlet pipe; 111, outer water inlet pipe; 1111, outer water inlet grille; 112, inner water inlet pipe; 1121, inner water inlet grille; 12, water outlet pipe; 121, exhaust outlet branch pipe; 13, rotating shaft bracket; 14, second bearing; 15, impeller chamber; 2, rotor-impeller assembly; 21, rotating shaft; 22, rotor bracket; 221, impeller fixing part; 23, main impeller; 24, magnetic ring; 25, water inlet impeller; 3, pump housing; 31, rotor chamber; 311, exhaust inlet branch pipe; 32, first bearing; 33, intermediate exhaust pipe; 4, stator assembly; 5, drive circuit board; 6, rear end cover; 7, independent exhaust pipe; 10, exhaust passage. Detailed Embodiments

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0022] This embodiment provides an inlet structure for a water pump, which can be applied to a water pump (especially an inverted drainage pump based on a centrifugal electronic water pump) to improve the water inlet performance of the water pump.

[0023] Please refer to Figures 1-3 , the inlet structure of the water pump in this embodiment, the water pump at least includes a pump cover 1 and a rotor-impeller assembly 2.

[0024] Among them, the pump cover 1 is an integrally formed cover-shaped member made of engineering plastic or metal material.

[0025] An impeller chamber 15 is formed inside the pump cover 1, and an inlet pipe 11 and an outlet pipe 12 communicating with both the inside and outside of the impeller chamber 15 are respectively formed on the pump cover 1. Specifically, the impeller chamber 15 is a cavity inside the pump cover 1, and both the inlet pipe 11 and the outlet pipe 12 are rigid short pipes integrally formed at the pump cover 1.

[0026] The rotor-impeller assembly 2 at least includes a main impeller 23 that can rotate in the impeller chamber 15 of the pump cover 1, and an inlet impeller 25 that can rotate in the inlet pipe 11 of the pump cover 1.

[0027] An inlet grille is formed on the side of the inlet pipe 11 of the pump cover 1, and the inlet grille of the pump cover 1 is radially aligned with the inlet impeller 25 of the rotor-impeller assembly 2.

[0028] Further, the inlet pipe 11 of the pump cover 1 includes an outer inlet pipe 111 and an inner inlet pipe 112 coaxially arranged from outside to inside. Both the outer inlet pipe 111 and the inner inlet pipe 112 are rigid short pipes integrally formed at the pump cover 1 and form a coaxial spaced nested structure; the inlet grille of the pump cover 1 includes an outer inlet grille 1111 provided on the outer inlet pipe 111 and an inner inlet grille 1121 provided on the inner inlet pipe 112. In fact, the outer inlet grille 1111 is a grille structure integrally formed on the outer inlet pipe 111, and the inner inlet grille 1121 is a grille structure integrally formed on the inner inlet pipe 112.

[0029] Setting the inlet pipe 11 of the pump cover 1 as a spaced nested structure of the outer inlet pipe 111 and the inner inlet pipe 112 can effectively isolate large particle impurities during water inlet and protect the inlet impeller 25.

[0030] Specifically, the blade of the water inlet impeller 25 is one of a fan-shaped blade, a spiral blade, and a paddle-shaped blade. In this embodiment, the blade of the water inlet impeller 25 is a fan-shaped blade.

[0031] This embodiment also provides an inverted drainage pump, which includes the water inlet structure of the above-mentioned water pump.

[0032] Please refer to Figures 1-3 , the inverted drainage pump of this embodiment further includes a pump housing 3, a stator assembly 4, a drive circuit board 5, and a rear end cover 6.

[0033] Among them, the pump housing 3 is an integrally formed semi-shell member made of engineering plastic or metal material, which provides a structural support foundation for the inverted drainage pump of this embodiment; the stator assembly 4 at least includes a stator bracket (also known as "stator core"), and an enameled wire coil wound around the stator bracket, which can generate a rotating magnetic field during operation to drive the rotor-impeller assembly 2 to rotate; the drive circuit board 5 is a printed circuit board (PCB), which is equipped with a main control, power electronic devices for driving the stator assembly 4 to operate, and necessary peripheral circuits for driving the stator assembly 4 to operate; the rear end cover 6 is an integrally formed cover member made of engineering plastic or metal material.

[0034] A rotor chamber 31 is formed in the pump housing 3. The rotor chamber 31 is a cavity structure integrally formed with the pump housing 3. The pump cover 1 is covered on the pump housing 3, so that the impeller chamber 15 of the pump cover 1 is communicated with the rotor chamber 31 of the pump housing 3; it can be understood that the pump cover 1 and the pump housing 3 can be fixed together by screws or buckles, etc., and a sealing ring is provided at the connection between the two to achieve sealing.

[0035] The rotor - impeller assembly 2 includes a rotating shaft 21, a rotor bracket 22, a magnetic ring 24, a main impeller 23, and a water inlet impeller 25. Among them, the rotating shaft 21 is a cylindrical metal shaft, the rotor bracket 22 is a bracket made of engineering plastic, which provides a structural support foundation for the rotor - impeller assembly 2. The magnetic ring 24 is a ring - shaped member with permanent magnetism. The main impeller 23 is a wheel - shaped member made of engineering plastic with several blades. The water inlet impeller 25 is a bushing - shaped member made of engineering plastic with several blades (in this embodiment, they are fan - shaped blades). The rotor bracket 22 is sleeved on the rotating shaft 21 and rotates with the rotating shaft 21. The magnetic ring 24 is sleeved on the rotor bracket 22 and is coaxially arranged with the rotor bracket 22. The main impeller 23 is fixed at one end of the rotor bracket 22 and is coaxially arranged with the rotor bracket 22. In fact, by placing the rotating shaft 21 and the magnetic ring 24 into the molding die of the rotor bracket 22 and using the in - mold injection molding method to form the rotor bracket 22, the rotating shaft 21, the magnetic ring 24, and the rotor bracket 22 can be formed into one body. The rotating shaft 21 and the magnetic ring 24 are respectively matched with the rotor bracket 22 through a groove - rib structure (or a key structure) to achieve anti - rotation (that is, the rotating shaft 21, the magnetic ring 24, and the rotor bracket 22 can rotate synchronously). Then, the main impeller 23 is fixed on the combined body of the rotor bracket 22 by ultrasonic welding (specifically welded to the impeller fixing part 221 at the end of the rotor bracket 22), and thus the manufacturing of the rotor - impeller assembly 2 is completed. The rotating shaft 21 is supported by the pump housing 3 and the pump cover 1, and passes through the rotor chamber 31 of the pump housing 3 and the impeller chamber 15 of the pump cover 1 until it reaches the water inlet pipe 11 of the pump cover 1. Specifically, a rotating shaft seat is formed in the rotor chamber 31 of the pump housing 3 (the rotating shaft seat is integrally formed at the bottom of the rotor chamber 31), and a rotating shaft bracket 13 is formed inside the pump cover 1 on the inner side of the water inlet pipe 11 (the rotating shaft bracket 13 is integrally formed on the inner side of the pump cover 1). The rotating shaft seat of the pump housing 3 and the rotating shaft bracket 13 of the pump cover 1 are aligned with each other. At least a part of the rotating shaft 21 of the rotor - impeller assembly 2 is supported at the rotating shaft seat of the pump housing 3 through a first bearing 32 (such as a ceramic bearing or a graphite bearing, and embedded in the rotating shaft seat), and at least another part of it is supported at the rotating shaft bracket 13 of the pump cover 1 (such as a ceramic bearing or a graphite bearing, and embedded in the rotating shaft bracket 13) through a second bearing 14. The water inlet impeller 25 is sleeved on a section of the rotating shaft 21 located in the water inlet pipe 11 and rotates with the rotating shaft 21. In fact, the water inlet impeller 25 is in interference fit with the rotating shaft 21 and is also matched with the rotating shaft 21 through a key structure to achieve anti - rotation (the water inlet impeller 25 and the rotating shaft 21 can rotate synchronously).

[0036] The stator assembly 4 is arranged in the pump housing 3 and is located outside the rotor chamber 31 of the pump housing 3. The stator assembly 4 is radially aligned with the magnetic ring 24 of the rotor - impeller assembly 2. In this embodiment, the stator assembly 4 is sleeved outside the rotor chamber 31 of the pump housing 3 and can be fixed in the pump housing 3 by snap - fitting or screwing.

[0037] The drive circuit board 5 is disposed within the pump housing 3 and is electrically connected to the stator assembly 4. In fact, the drive circuit board 5 can be fixed within the pump housing 3 by means of snap-fastening or screw-threading. In some possible embodiments, terminals are provided at the ends of the enameled wire coils of the stator assembly 4, and these terminals are soldered to the drive circuit board 5 to achieve the electrical connection between the stator assembly 4 and the drive circuit board 5.

[0038] The rear end cover 6 is fixed to the other end of the pump housing 3 relative to the pump cover 1 to shield the stator assembly 4 and the drive circuit board 5. It can be understood that the rear end cover 6 and the pump housing 3 can be fixed together by means of screws or snaps, etc., and a sealing ring is provided at the junction of the two to achieve sealing.

[0039] In order to further improve the self-priming performance of the inverted drainage pump of this embodiment, an exhaust passage 10 is provided between the rotor chamber 31 of the pump housing 3 and the water outlet pipe 12 of the pump cover 1; when water enters through the water inlet pipe 11 of the pump cover 1, the air in the rotor chamber 31 of the pump housing 3 is driven by pressure, travels along the exhaust passage 10 to the water outlet pipe 12 of the pump cover 1, and is discharged outside the water outlet pipe 12.

[0040] More specifically, the inverted drainage pump of this embodiment further includes an independent exhaust pipe 7, which is a flexible short pipe made of silicone material, rubber material or flexible plastic material; an exhaust inlet branch pipe 311 is formed at the rotor chamber 31 of the pump housing 3, that is, the exhaust inlet branch pipe 311 is a rigid short pipe structure integrally formed at the bottom of the rotor chamber 31 and passing through the rotor chamber 31; and an intermediate exhaust pipe 33 is also formed at the pump housing 3, that is, the intermediate exhaust pipe 33 is a rigid short pipe structure integrally formed at the pump housing 3; an exhaust outlet branch pipe 121 is formed at the water outlet pipe 12 of the pump cover 1, that is, the exhaust outlet branch pipe 121 is a rigid branch pipe structure integrally formed at the water outlet pipe 12 and communicating the inner and outer sides of the water outlet pipe 12; the exhaust inlet branch pipe 311 of the pump housing 3, the independent exhaust pipe 7, the intermediate exhaust pipe 33 of the pump housing 3 and the exhaust outlet branch pipe 121 of the pump cover 1 are sequentially connected to form the exhaust passage 10; wherein, both ends of the independent exhaust pipe 7 are respectively sleeved on the ends of the exhaust inlet branch pipe 311 and the intermediate exhaust pipe 33 of the pump housing 3, and sealing is achieved through its own flexibility; wherein, the free end of the exhaust outlet branch pipe 121 of the pump cover 1 directly penetrates into the intermediate exhaust pipe 33 of the pump housing 3, and sealing is achieved by providing a sealing ring between the two.

[0041] When the inverted drainage pump of this embodiment is in use, an external power supply is connected to the drive circuit board 5, and the drive circuit board 5 supplies power to the enameled wire coil of the stator assembly 4. After the enameled wire coil is powered on, an alternating magnetic field can be generated. After being guided by the stator bracket (stator core), a rotating magnetic field can be generated in the rotor chamber 31. This rotating magnetic field is located in the rotor chamber 31 in space. The rotor-impeller assembly 2 in the rotor chamber 31 has its magnetic ring 24 magnetically coupled with this rotating magnetic field, causing the entire rotor-impeller assembly 2 to start rotating. When the main impeller 23 in the impeller chamber 15 rotates, a directional pressure difference can be generated in the impeller chamber 15, thereby driving the liquid to be sucked into the impeller chamber 15 from the water inlet pipe 11 and discharged from the water outlet pipe 12, thus completing the function of the water pump.

[0042] During the above process, the water inlet impeller 25 also rotates with the rotating shaft 21. The rotating water inlet impeller 25 can suck the liquid at the water inlet pipe 11 into the impeller chamber 15, and then form a stable water flow under the drive of the main impeller 23. Even if the liquid level is relatively shallow, as long as the liquid level can contact the water inlet impeller 25, it can operate normally without initial water supply. An intake grille is formed on the side of the water inlet pipe 11 of the pump cover 1, which is conducive to the liquid entering the water inlet pipe 11 and contacting the water inlet impeller 25. Therefore, there is a cooperative effect between the intake grille and the water inlet impeller 25.

[0043] Please refer especially to Figure 3 , during the above process, when the liquid is sucked into the impeller chamber 15, the air remaining in the rotor chamber 31 is driven by the pressure and reaches the water outlet pipe 12 of the pump cover 1 along the exhaust passage 10 (successively the exhaust inlet branch pipe 311 of the pump housing 3, the independent exhaust pipe 7, the intermediate exhaust pipe 33 of the pump housing 3, and the exhaust outlet branch pipe 121 of the pump cover 1), and is discharged outside the water outlet pipe 12. Without filling with water or exhausting the air in the rotor chamber 31, the inverted drainage pump of this embodiment can be used normally.

[0044] The water inlet structure of the water pump of this embodiment and the inverted drainage pump using the same. The rotor-impeller assembly 2 includes a water inlet impeller 25 that can rotate in the water inlet pipe 11 of the pump cover 1. The rotating water inlet impeller 25 can suck the liquid at the water inlet pipe 11 into the impeller chamber 15, and then form a stable water flow under the drive of the main impeller 23. Even if the liquid level is relatively shallow, as long as the liquid level can contact the water inlet impeller 25, it can operate normally without initial water supply. An intake grille that is radially aligned with the water inlet impeller 25 is formed on the side of the water inlet pipe 11 of the pump cover 1, which is conducive to the liquid entering the water inlet pipe 11 and contacting the water inlet impeller 25. The water inlet structure of the water pump of this embodiment and the inverted drainage pump using the same provide a water inlet structure with a self-priming function for the inverted drainage pump, and it can be used normally without filling with water or exhausting the air in the rotor chamber 31.

[0045] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A water inlet structure of a water pump, characterized in that: The water pump comprises at least a pump cover and a rotor-impeller assembly; An impeller chamber is formed on the inner side of the pump cover, and a water inlet pipe and a water outlet pipe are respectively formed on the pump cover to communicate with both sides of the impeller chamber inside and outside; The rotor-impeller assembly comprises at least a main impeller capable of rotating in an impeller chamber of the pump cover, and a water inlet impeller capable of rotating in a water inlet pipe of the pump cover; A water inlet grille is formed on the side of the water inlet pipe of the pump cover, and the water inlet grille of the pump cover and the water inlet impeller of the rotor-impeller assembly are aligned with each other in the radial direction.

2. The water inlet structure of the water pump according to claim 1, characterized in that: The water inlet pipe of the pump cover comprises an outer water inlet pipe and an inner water inlet pipe coaxially arranged from outside to inside; The water inlet grille of the pump cover includes an outer water inlet grille arranged at the outer water inlet pipe, and an inner water inlet grille arranged at the inner water inlet pipe.

3. The water inlet structure of the water pump according to claim 1 or 2, characterized in that: The blades of the water inlet impeller are one of fan-shaped blades, spiral blades and paddle-shaped blades.

4. An inverted drainage pump, characterized in that: The invention comprises the water inlet structure of the water pump as described in any one of claims 1 to 3.

5. The inverted drainage pump according to claim 4, characterized in that: It also includes a pump housing, a stator assembly, a drive circuit board and a rear end cover; A rotor chamber is formed in the pump housing, and the pump cover is covered on the pump housing so that the impeller chamber of the pump cover and the rotor chamber of the pump housing are communicated with each other; The rotor-impeller assembly comprises a rotating shaft, a rotor bracket, a magnetic ring, the main impeller and the water inlet impeller; the rotating shaft is supported by the pump casing and the pump cover, and passes through the rotor chamber of the pump casing and the impeller chamber of the pump cover until reaching the water inlet pipe of the pump cover; the rotor bracket is sleeved on the rotating shaft and rotates with the rotating shaft, the magnetic ring is sleeved on the rotor bracket and is coaxially arranged with the rotor bracket, the main impeller is fixed to one end of the rotor bracket and is coaxially arranged with the rotor bracket; the water inlet impeller is sleeved on a section of the rotating shaft located in the water inlet pipe, and rotates with the rotating shaft; The stator assembly is arranged in the pump housing and outside the rotor chamber of the pump housing, and the magnetic rings of the stator assembly and the rotor-impeller assembly are aligned with each other in the radial direction; The driving circuit board is disposed in the pump housing and is electrically connected to the stator assembly; The rear end cover is fixed to the other end of the pump housing relative to the pump cover to shield the stator assembly and the driving circuit board.

6. The inverted drainage pump according to claim 5, characterized in that: A rotating shaft seat is formed in the rotor chamber of the pump housing, and a rotating shaft bracket is formed on the inner side of the water inlet pipe of the pump cover, and the rotating shaft seat of the pump housing and the rotating shaft bracket of the pump cover are aligned with each other; At least a portion of the rotating shaft of the rotor-impeller assembly is supported at the rotating shaft seat of the pump housing through a first bearing, and at least another portion of the rotating shaft is supported at the rotating shaft support of the pump cover through a second bearing.

7. The inverted drainage pump according to claim 5 or 6, characterized in that: An exhaust passage is provided between the rotor chamber of the pump housing and the water outlet pipe of the pump cover; When water is introduced through the water inlet pipe of the pump cover, the air in the rotor chamber of the pump housing is driven by pressure to reach the water outlet pipe of the pump cover along the exhaust passage and is discharged to the outside of the water outlet pipe.

8. The inverted drainage pump according to claim 7, characterized in that: Also included is a separate exhaust; An exhaust inlet branch pipe is formed at the rotor chamber of the pump housing, and an intermediate exhaust pipe is also formed at the pump housing; An exhaust outlet branch pipe is formed at the water outlet pipe of the pump cover; The exhaust inlet branch pipe of the pump housing, the independent exhaust pipe, the intermediate exhaust pipe of the pump housing and the exhaust outlet branch pipe of the pump cover are connected in sequence to form the exhaust passage.

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