Self-exhaust type inverted drainage pump

Abstract

The utility model discloses a self-exhaust type inverted drainage pump, which relates to the technical field of water pumps and parts thereof, and comprises a pump cover, a rotor-impeller assembly and a pump shell, the pump cover covers the pump shell, so that an impeller chamber of the pump cover is communicated with a rotor chamber of the pump shell; the rotor-impeller assembly at least comprises an impeller capable of rotating in an impeller cavity of the pump cover; an exhaust channel is arranged between the rotor chamber of the pump shell and the outside; when water enters through the water inlet of the pump cover, air in the rotor cavity of the pump shell is exhausted to the outside along the exhaust channel under the driving of pressure. The utility model mainly solves the problem of how to provide a self-exhausting function for the inverted draining pump. The self-exhaust type inverted drainage pump has a self-exhaust function, so that a self-suction function can be realized, and the self-exhaust type inverted drainage pump can be normally used without filling water or completely pumping air in the rotor cavity when in use.

Description

Technical Field

[0001] The utility model relates to the technical field of water pumps and parts thereof, in particular to a self-exhaust inverted drainage pump. Background Art

[0002] Electronic water pumps have 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-heated mattresses, air conditioners and humidifiers are increasingly equipped with electronic water pumps to achieve precise quantitative liquid circulation / discharge functions.

[0003] Drain pumps are an important application of electronic water pumps, which can drain liquids from structures such as water tanks and sinks 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 water outlet pipe and pump chamber. If the water outlet pipe and pump chamber are not filled with water, or the air in the water outlet pipe and pump chamber is not completely exhausted, the vacuum degree of the pump chamber will be insufficient, making it difficult for the centrifugal drainage pump to absorb water.

[0005] The usual solution to the above problem is to continue filling the water pipe or to completely remove the air from the water inlet pipe. However, the above operation requires certain professional training or special equipment, which is difficult for some users to implement.

[0006] In summary, how to provide a self-exhaust function for an inverted drainage pump has become one of the problems that need to be solved urgently. Utility Model Content

[0007] The purpose of the utility model is to provide a self-exhausting inverted drainage pump, which can automatically achieve air pressure balance in the pump chamber and thus realize a self-priming function.

[0008] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a self-exhaust inverted drainage pump, which at least includes a pump cover, a rotor-impeller assembly and a pump casing; an impeller chamber is formed on the inner side of the pump cover, and a water inlet and a water outlet are respectively formed on the pump cover, which are connected to the inner and outer sides of the impeller chamber; a rotor chamber is formed in the pump casing, and the pump cover is closed on the pump casing so that the impeller chamber of the pump cover and the rotor chamber of the pump casing are connected to each other; the rotor-impeller assembly at least includes an impeller capable of rotating in the impeller chamber of the pump cover; an exhaust channel is provided between the rotor chamber of the pump casing and the outside world; when water is introduced through the water inlet of the pump cover, the air in the rotor chamber of the pump casing is discharged to the outside world along the exhaust channel under the drive of pressure.

[0009] In the above technical solution, the self-exhaust inverted drainage pump of the present invention also includes an independent exhaust pipe; an exhaust inlet branch is formed at the rotor chamber of the pump casing, and a main exhaust pipe is also formed at the pump casing, and the free end of the main exhaust pipe is connected to the outside world; the exhaust inlet branch of the pump casing, the independent exhaust pipe and the main exhaust pipe of the pump casing are connected in sequence to form the exhaust channel.

[0010] In the above technical solution, the independent exhaust pipe is a soft pipe; one end of the independent exhaust pipe is sleeved on the end of the exhaust inlet branch pipe of the pump housing, and is sealed by its own softness.

[0011] In the above technical solution, the other end of the independent exhaust pipe penetrates into the main exhaust pipe of the pump casing, and there is a gap between the independent exhaust pipe and the main exhaust pipe of the pump casing; the independent exhaust pipe is located at one end of the main exhaust pipe of the pump casing, and the horizontal height of its end face is higher than the bottom surface of the rotor chamber of the pump casing, but lower than the outlet end of the exhaust inlet branch pipe of the pump casing.

[0012] In the above technical solution, the self-exhaust inverted drainage pump of the present invention also includes a shaft core; the shaft core 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; the rotor-impeller assembly is sleeved on the shaft core and can rotate with the shaft core as the axis.

[0013] In the above technical solution, the rotor-impeller assembly includes a rotor bracket, an impeller, a magnetic ring and a bearing; the bearing is inserted into the rotor bracket and is coaxially arranged with the rotor bracket; the magnetic ring is sleeved outside the rotor bracket and is coaxially arranged with the rotor bracket; the impeller is fixed on the rotor bracket and can rotate with the rotor bracket; when the rotor-impeller assembly is sleeved on the shaft core, the bearing and the shaft core cooperate with each other.

[0014] In the above technical solution, a shaft core seat is formed in the rotor chamber of the pump casing, and a shaft core bracket is formed on the inner side of the water inlet of the pump cover. The shaft core seat of the pump casing and the shaft core bracket of the pump cover are aligned with each other; at least a part of the shaft core is supported at the shaft core seat of the pump casing, and at least another part thereof is supported at the shaft core bracket of the pump cover.

[0015] In the above technical solution, the self-exhaust inverted drainage pump of the present invention further includes a thrust washer; the thrust washer is arranged between the rotor-impeller assembly and the shaft core bracket of the pump cover.

[0016] In the above technical solution, the self-exhaust inverted drainage pump of the present invention also includes a stator assembly and a drive circuit board; 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 aligned with each other in the radial direction; the drive circuit board is arranged in the pump housing and is electrically connected to the stator assembly.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: the self-exhaust inverted drainage pump of the present invention has an exhaust passage between the rotor chamber of the pump casing and the outside world. When water is introduced through the water inlet of the pump cover, the air in the rotor chamber of the pump casing is driven by pressure and discharged to the outside world along the exhaust passage; the self-exhaust inverted drainage pump of the present invention has a self-exhaust function, and can thus realize a self-priming function. When in use, there is no need to fill water or exhaust the air in the rotor chamber, and it can be used normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional view of the present invention.

[0019] Figure 2 This is an exploded view of the present invention.

[0020] Figure 3 It is a cross-sectional view of the present invention.

[0021] The figures are marked as follows: 1. Pump cover; 11. Water inlet; 12. Water outlet; 13. Shaft core bracket; 14. Impeller chamber; 2. Rotor-impeller assembly; 21. Rotor bracket; 211. Impeller fixing part; 22. Impeller; 23. Magnetic ring; 24. Bearing; 3. Pump casing; 31. Rotor chamber; 311. Exhaust inlet branch pipe; 32. Main exhaust pipe; 4. Shaft core; 5. Thrust washer; 6. Stator assembly; 7. Drive circuit board; 8. Independent exhaust pipe; 10. Exhaust channel. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] This embodiment provides a self-exhaust inverted drainage pump, which has a self-exhaust function and can automatically achieve air pressure balance in the pump chamber, thereby achieving a self-priming function.

[0024] This embodiment takes a centrifugal electronic water pump as an example to specifically illustrate the technical solution of the present utility model.

[0025] See also Figure 1-Figure 3 The self-exhaust inverted drainage pump of this embodiment includes at least a pump cover 1, a rotor-impeller assembly 2 and a pump casing 3.

[0026] Among them, the pump cover 1 is an integrally formed cover-shaped component made of engineering plastic or metal, and the pump shell 3 is an integrally formed semi-shell component made of engineering plastic or metal, which is used to provide a structural support foundation for the self-exhaust inverted drainage pump of this embodiment.

[0027] An impeller chamber 14 is formed on the inner side of the pump cover 1, and a water inlet 11 and a water outlet 12 are respectively formed on the pump cover 1 to connect the inner and outer sides of the impeller chamber 14. Specifically, the impeller chamber 14 is a cavity on the inner side of the pump cover 1, and the water inlet 11 and the water outlet 12 are both hard short tubes integrally formed on the pump cover 1.

[0028] A rotor chamber 31 is formed in the pump casing 3, and the rotor chamber 31 is a cavity structure integrally formed with the pump casing 3; the pump cover 1 is covered on the pump casing 3, so that the impeller chamber 14 of the pump cover 1 and the rotor chamber 31 of the pump casing 3 are connected to each other; it can be understood that the pump cover 1 and the pump casing 3 can be fixed as a whole by screws or snaps, and a sealing ring is provided at the connection between the two to achieve sealing.

[0029] The rotor-impeller assembly 2 includes at least an impeller 22 capable of rotating in the impeller chamber 14 of the pump cover 1 to drive the flow of liquid.

[0030] In order to achieve the self-exhaust function, an exhaust channel 10 is provided between the rotor chamber 31 of the pump housing 3 and the outside world; when water is introduced through the water inlet 11 of the pump cover 1, the air in the rotor chamber 31 of the pump housing 3 is driven by pressure and discharged to the outside world along the exhaust channel 10.

[0031] Specifically, the self-exhaust inverted drainage pump of this embodiment also includes an independent exhaust pipe 8, which is a soft short tube made of silicone, rubber 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 hard short tube structure integrally formed at the bottom of the rotor chamber 31 and passing through the rotor chamber 31; and a main exhaust pipe 32 is also formed at the pump housing 3, that is, the main exhaust pipe 32 is a hard short tube structure integrally formed on the side of the pump housing 3, and the main exhaust pipe 32 The free end of the main exhaust pipe 32 is connected to the outside world. Specifically, the port of the free end of the main exhaust pipe 32 is opened on the outside of the pump casing 3 to connect to the outside world; the exhaust inlet branch pipe 311 of the pump casing 3, the independent exhaust pipe 8 and the main exhaust pipe 32 of the pump casing 3 are connected in sequence to form an exhaust channel 10; wherein, one end of the independent exhaust pipe 8 is sleeved on the end of the exhaust inlet branch pipe 311 of the pump casing 3, and is sealed by its own softness; wherein, the main exhaust pipe 32 is both a part of the exhaust channel 10 and can limit / fix the independent exhaust pipe 8.

[0032] Furthermore, the other end of the independent exhaust pipe 8 penetrates into the main exhaust pipe 32 of the pump casing 3, and there is a gap between the independent exhaust pipe 8 and the main exhaust pipe 32 of the pump casing 3; the independent exhaust pipe 8 is located at one end of the main exhaust pipe 32 of the pump casing 3, and the horizontal height of its end face is higher than the bottom surface of the rotor chamber 31 of the pump casing 3, but lower than the outlet end of the exhaust inlet branch pipe 311 of the pump casing 3.

[0033] Specifically, the self-exhaust inverted drainage pump of this embodiment also includes a shaft core 4, which is a cylindrical metal shaft; the shaft core 4 is supported by the pump casing 3 and the pump cover 1, and passes through the rotor chamber 31 of the pump casing 3 and the impeller chamber 14 of the pump cover 1; the rotor-impeller assembly 2 is sleeved on the shaft core 4, and can rotate with the shaft core 4 as the axis; it should be noted that the shaft core 4 is a fixed shaft and does not rotate with the rotor-impeller assembly 2.

[0034] More specifically, the rotor-impeller assembly 2 includes a rotor bracket 21, an impeller 22, a magnetic ring 23 and a bearing 24; wherein the rotor bracket 21 is an engineering plastic bracket, which is used to provide a structural support base for the rotor-impeller assembly 2, the impeller 22 is an engineering plastic wheel-shaped component with a plurality of blades, the magnetic ring 23 is a ring-shaped component with permanent magnetism, and the bearing 24 is a ceramic bearing or a graphite bearing, which has self-lubricating properties; the bearing 24 is inserted into the rotor bracket 21 and is coaxially arranged with the rotor bracket 21; the magnetic ring 23 is sleeved outside the rotor bracket 21 and is coaxially arranged with the rotor bracket 21; the impeller 22 is fixed to the rotor bracket 21 and can rotate with the rotor bracket 21; in fact, the bearing 24 and the magnetic ring 23 are placed in the rotor bracket 21. In the molding mold of the sub-bracket 21, the rotor bracket 21 is molded by in-mold injection molding, and the bearing 24, the magnetic ring 23 and the rotor bracket 21 can be formed into one body. The bearing 24 and the magnetic ring 23 can respectively cooperate with the rotor bracket 21 through a groove-rib structure (or a key structure) to achieve anti-rotation (that is, the bearing 24, the magnetic ring 23 and the rotor bracket 21 can rotate synchronously), and then the impeller 22 is fixed to the assembly of the rotor bracket 21 by ultrasonic welding (specifically welded to the impeller fixing part 211 at the end of the rotor bracket 21), and the manufacture of the rotor-impeller assembly 2 is completed; when the rotor-impeller assembly 2 is sleeved on the shaft core 4, the bearing 24 and the shaft core 4 cooperate with each other, that is, the rotation process of the rotor-impeller assembly 2 with the shaft core 4 as the axis is supported by the bearing 24.

[0035] To be more specific, a shaft core 4 seat is formed in the rotor chamber 31 of the pump casing 3 (the shaft core 4 seat is integrally formed at the bottom of the rotor chamber 31), and a shaft core bracket 13 is formed on the inner side of the water inlet of the pump cover 1 (the shaft core bracket 13 is integrally formed on the inner side of the pump cover 1), and the shaft core 4 seat of the pump casing 3 and the shaft core bracket 13 of the pump cover 1 are aligned with each other; at least a part of the shaft core 4 is supported at the shaft core 4 seat of the pump casing 3, and at least another part thereof is supported at the shaft core bracket 13 of the pump cover 1. In fact, the shaft core 4 is respectively interference fit or key fit with the shaft core 4 seat of the pump casing 3 and the shaft core bracket 13 of the pump cover 1 to achieve fixation and anti-rotation.

[0036] Furthermore, the self-exhaust inverted drainage pump of this embodiment also includes a thrust washer 5, which is a metal gasket; the thrust washer 5 is arranged between the rotor-impeller assembly 2 and the shaft core bracket 13 of the pump cover 1. In some possible embodiments, the thrust washer 5 is embedded and fixed at the end of the shaft core bracket 13, and in other possible embodiments, the thrust washer 5 is sleeved on the shaft core 4; the provision of the thrust washer 5 can prevent the rotor-impeller assembly 2 from directly contacting the shaft core bracket 13 of the pump cover 1, thereby preventing excessive wear of the rotor-impeller assembly 2 and the shaft core bracket 13 of the pump cover 1.

[0037] The self-exhaust inverted drainage pump of this embodiment further comprises a stator assembly 6 and a drive circuit board 7; the stator assembly 6 comprises at least a stator bracket (also known as a "stator core"), and an enameled wire coil wound on 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 7 is a printed circuit board (PCB), which is equipped with a main control, power electronic devices for driving the stator assembly 6 to operate, and necessary peripheral circuits for driving the stator assembly 6 to operate; the stator assembly 6 is arranged in the pump housing 3 and is located outside the rotor chamber 31 of the pump housing 3, and the stator assembly 6 and the rotor-impeller assembly 2 are connected to each other. The magnetic rings 23 of the wheel assembly 2 are aligned with each other in the radial direction. In this embodiment, the stator assembly 6 is sleeved outside the rotor chamber 31 of the pump casing 3, and can be fixed in the pump casing 3 by snap-fitting or screwing; the drive circuit board 7 is arranged in the pump casing 3 and is electrically connected to the stator assembly 6. In fact, the drive circuit board 7 can be fixed in the pump casing 3 by snap-fitting or screwing. In some possible embodiments, a terminal is provided at the end of the enameled wire coil of the stator assembly 6, and the terminal is welded on the drive circuit board 7 to realize the electrical connection between the stator assembly 6 and the drive circuit board 7.

[0038] In some possible embodiments, the self-exhaust inverted drainage pump of this embodiment further includes a rear end cover (not shown in the figure), which is an integrally molded cover-shaped component made of engineering plastic or metal; the rear end cover is fixed to the other end of the pump casing 3 relative to the pump cover 1 to shield the stator assembly 6 and the drive circuit board 7. It can be understood that the rear end cover and the pump casing 3 can be fixed as a whole by screws or snaps, and a sealing ring is provided at the connection between the two to achieve sealing.

[0039] When the self-exhaust inverted drainage pump of this embodiment is in use, an external power supply is connected to the driving circuit board 7, and the driving circuit board 7 energizes the enameled wire coil of the stator assembly 6. After the enameled wire coil is energized, 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. The rotating magnetic field is located in the rotor chamber 31 in space; the rotor-impeller assembly 2 in the rotor chamber 31, its magnetic ring 23 is magnetically coupled with the rotating magnetic field, causing the entire rotor-impeller assembly 2 to start rotating; when the impeller 22 in the impeller chamber 14 rotates, a directional pressure difference can be generated in the impeller chamber 14, thereby driving the liquid to be sucked into the impeller chamber 14 from the water inlet 11 and discharged from the water outlet 12, thereby completing the function of the water pump.

[0040] See also Figure 3In the above process, when the liquid is sucked into the impeller chamber 14, the air retained in the rotor chamber 31 is driven by pressure and discharged to the outside along the exhaust channel 10 (the exhaust inlet branch 311 of the pump housing 3, the independent exhaust pipe 8 and the main exhaust pipe 32 of the pump housing 3 in sequence). There is no need to fill water or exhaust the air in the rotor chamber 31, and the self-exhaust inverted drainage pump of this embodiment can be used normally.

[0041] See also Figure 3 In the above process, since the independent exhaust pipe 8 is located at one end (called the "free end") in the main exhaust pipe 32 of the pump casing 3, the horizontal height of its end surface is higher than the bottom surface of the rotor chamber 31 of the pump casing 3, the liquid will fill the entire rotor chamber 31, so that the entire rotor-impeller assembly 2 is immersed, so that the self-exhaust inverted drainage pump of this embodiment obtains the best drainage performance; and since the independent exhaust pipe 8 is located at one end in the main exhaust pipe 32 of the pump casing 3, its end surface is lower than the outlet end of the exhaust inlet branch 311 of the pump casing 3, the liquid level in the exhaust inlet branch 311 will be flush with the free end of the independent exhaust pipe 8, so that the liquid will not overflow through the exhaust inlet branch 311 of the pump casing 3.

[0042] The self-exhaust inverted drainage pump of this embodiment is provided with an exhaust passage 10 between the rotor chamber 31 of the pump casing 3 and the outside world. When water is introduced through the water inlet 11 of the pump cover 1, the air in the rotor chamber 31 of the pump casing 3 is driven by pressure and discharged to the outside world along the exhaust passage 10. The self-exhaust inverted drainage pump of this embodiment has a self-exhaust function and can realize a self-priming function. When in use, there is no need to fill water or exhaust the air in the rotor chamber 31 and it can be used normally.

[0043] Although the 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 variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A self-exhaust inverted drainage pump, characterized in that: It comprises at least a pump cover, a rotor-impeller assembly and a pump casing; An impeller chamber is formed on the inner side of the pump cover, and a water inlet and a water outlet are respectively formed on the pump cover, which are connected to the inner and outer sides of the impeller chamber; A rotor chamber is formed in the pump housing, and the pump cover is fitted on the pump housing so that the impeller chamber of the pump cover and the rotor chamber of the pump housing are in communication with each other; The rotor-impeller assembly includes at least an impeller capable of rotating in an impeller chamber of the pump cover; An exhaust passage is provided between the rotor chamber of the pump housing and the outside world; When water is introduced through the water inlet of the pump cover, the air in the rotor chamber of the pump housing is driven by pressure and discharged to the outside along the exhaust passage.

2. The self-exhaust inverted drainage pump according to claim 1, characterized in that: Also included are independent exhaust pipes; An exhaust inlet branch is formed at the rotor chamber of the pump housing, and a main exhaust pipe is also formed at the pump housing, and the free end of the main exhaust pipe is connected to the outside; The exhaust inlet branch pipe of the pump housing, the independent exhaust pipe and the main exhaust pipe of the pump housing are connected in sequence to form the exhaust channel.

3. The self-exhaust inverted drainage pump according to claim 2, characterized in that: The independent exhaust pipe is a flexible pipe; One end of the independent exhaust pipe is sleeved on the end of the exhaust inlet branch pipe of the pump housing and is sealed by its own softness.

4. The self-exhaust inverted drainage pump according to claim 2 or 3, characterized in that: The other end of the independent exhaust pipe penetrates into the main exhaust pipe of the pump housing, and there is a gap between the independent exhaust pipe and the main exhaust pipe of the pump housing; The independent exhaust pipe is located at one end of the main exhaust pipe of the pump housing, and the horizontal height of its end surface is higher than the bottom surface of the rotor chamber of the pump housing, but lower than the outlet end of the exhaust inlet branch pipe of the pump housing.

5. The self-exhaust inverted drainage pump according to claim 1, characterized in that: Also includes an axis core; The shaft core 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; The rotor-impeller assembly is sleeved on the shaft core and can rotate around the shaft core.

6. The self-exhaust inverted drainage pump according to claim 5, characterized in that: The rotor-impeller assembly includes a rotor support, an impeller, a magnetic ring and a bearing; The bearing is inserted into the rotor support and is coaxially arranged with the rotor support; The magnetic ring is sleeved outside the rotor bracket and is coaxially arranged with the rotor bracket; The impeller is fixed to the rotor support and can rotate along with the rotor support; When the rotor-impeller assembly is sleeved on the shaft core, the bearing and the shaft core cooperate with each other.

7. The self-exhaust inverted drainage pump according to claim 5 or 6, characterized in that: A shaft core seat is formed in the rotor chamber of the pump housing, and a shaft core bracket is formed on the inner side of the water inlet of the pump cover. The shaft core seat of the pump housing and the shaft core bracket of the pump cover are aligned with each other; At least a portion of the shaft core is supported on the shaft core seat of the pump housing, and at least another portion thereof is supported on the shaft core support of the pump cover.

8. The self-exhaust inverted drainage pump according to claim 7, characterized in that: Also included are thrust washers; The thrust washer is arranged between the rotor-impeller assembly and the shaft core bracket of the pump cover.

9. The self-exhaust inverted drainage pump according to claim 6, characterized in that: Also included are a stator assembly and a driver circuit board; The stator assembly is disposed in the pump housing and outside the rotor chamber of the pump housing, and the stator assembly and the magnetic ring of 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.

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