Water pump with outer rotor motor

Abstract

The invention relates to the technical field of pump bodies, and provides a water pump with an outer rotor motor. The waterproof sleeve is connected into the pump body in a sealing mode, a sealing cavity is formed between one end of the waterproof sleeve and the pump body, and a water conveying cavity is formed between the other end of the waterproof sleeve and the pump body; the stator assembly is connected in the sealing cavity; and the rotor assembly is rotationally connected into the water conveying cavity and arranged on the outer side of the stator assembly in a sleeving mode, and an impeller is integrally formed on the rotor assembly. Compared with the prior art, the water pump has the advantages that the interior of the water pump is divided into the water conveying cavity and the sealing cavity through the waterproof sleeve, the stator assembly is connected into the sealing cavity, the rotor assembly and the impeller are connected into the conveying cavity, the rotor assembly is cooled through liquid in the water conveying cavity, and the water pump can keep high-power output; and the impeller and the rotor assembly are integrally formed, so that the impeller cannot move in the radial direction, and the noise generated when the water pump is used is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of pump bodies, in particular to a water pump with an outer rotor motor. Background Art

[0002] Electronic water pump is a kind of water pump driven by electricity, which is widely used in the cooling system of automobile engines. It is different from the traditional mechanical water pump, which relies on the mechanical movement of the engine to operate. The main feature of electronic water pump is that it uses electric motor or other electric drive device as the power source and adjusts its operating state through electronic control system.

[0003] For example, a Chinese patent (authorization announcement number: CN209462138U) introduces an outer rotor motor and a water pump used therein. The outer rotor motor is composed of a base, a stator assembly and a rotor assembly, wherein a sleeve portion extends from the middle of the base, a bearing seat is arranged in the sleeve portion, a bearing is installed in the bearing seat, and the bearing supports the rotating shaft. The stator assembly is mounted on the outside of the sleeve portion, while the rotor assembly is sleeved on the outside of the stator assembly and connected to one end of the rotating shaft. In addition, there is a rotor cover on the outside of the rotor assembly, which is fixed to the base to ensure that the rotor assembly is in a sealed state, thereby improving the sealing and waterproof properties. At the same time, it has the advantages of simple structure, low cost, high reliability and simple production process, showing high practical value.

[0004] However, the rotor in this design runs in a closed environment, which makes it difficult to effectively dissipate the heat generated during operation, affecting the pump's ability to continue working under high load conditions, thereby limiting the pump's maximum output power. In addition, the impeller and rotor of the pump are mechanically connected, and the impeller's rotation center may be offset from the rotor's rotation center, which will cause the impeller to have radial displacement during rotation, thereby generating noise. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a water pump with an outer rotor motor in view of the current status of the prior art.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: a water pump with an outer rotor motor is provided, comprising: a pump body; A water-blocking sleeve is sealed and connected to the pump body, a sealing cavity is formed between one end of the water-blocking sleeve and the pump body, and a water-conveying cavity is formed between the other end of the water-blocking sleeve and the pump body; a stator assembly connected in the sealed cavity; A rotor assembly is rotatably connected in the water transport cavity and sleeved on the outer side of the stator assembly, wherein: An impeller is integrally formed on the rotor assembly, and the impeller is rotatably connected in the water transport cavity to promote the flow of liquid in the water transport cavity.

[0007] In the above-mentioned water pump with an outer rotor motor, a stator winding is wound on the stator assembly, and an end of the stator winding abuts against the inner wall of the water blocking sleeve.

[0008] In the above-mentioned water pump with an external rotor motor, the watertight sleeve includes a main body with a double-layer structure, the inner layer structure of the main body has a first opening facing the sealing cavity, and the outer layer structure of the main body has a second opening facing the water transport cavity. An annular mounting portion is formed between the inner layer structure and the outer layer structure of the main body, and the rotor assembly is rotatably connected in the annular mounting portion.

[0009] In the above-mentioned water pump with an outer rotor motor, a graphite ring is integrally formed in the annular mounting portion, and the graphite ring is slidably matched with the stator assembly.

[0010] In the above-mentioned water pump with an external rotor motor, the impeller includes an impeller body and a base plate connected between the impeller body and the rotor assembly, the impeller body is configured with a plurality of main blades, and the base plate is configured with a guide blade at one end of the impeller body facing the impeller body, and the guide blade has the same extension direction as the main blade.

[0011] In the above-mentioned water pump with an outer rotor motor, the pump body includes an outer shell and a cover, the outer side wall of the main body extends outward to form a mounting portion, and sealing rings are connected between the mounting portion and the cover, and between the mounting portion and the outer shell.

[0012] In the above-mentioned water pump with an outer rotor motor, a columnar connecting portion is constructed in the outer shell, and the stator assembly is fixed on the connecting portion.

[0013] In the above-mentioned water pump with an outer rotor motor, the cover is configured with an inlet and an outlet, and both the inlet and the outlet are communicated with the water transport cavity.

[0014] Compared with the prior art, the advantage of the present invention is that the water pump is divided into a water transport chamber and a sealing chamber by a water-blocking sleeve, the stator assembly is connected in the sealing chamber, and the rotor assembly and the impeller are connected in the transport chamber. The liquid in the water transport chamber cools the rotor assembly, so that the water pump can maintain high-power output, and the one-piece molding arrangement between the impeller and the rotor assembly prevents the impeller from moving in the radial direction, thereby reducing the noise of the water pump during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a three-dimensional diagram of a water pump having an outer rotor motor according to the present invention; Figure 2 yes Figure 1 Floor plan in ; Figure 3 yes Figure 2 Sectional view along AA direction; Figure 4 It is a three-dimensional diagram of the watertight sleeve; Figure 5 yes Figure 4 Floor plan in ; Figure 6 yes Figure 5 Cross-sectional view along the BB direction; Figure 7 It is a three-dimensional view of the impeller and rotor assembly when connected; Figure 8 yes Figure 7 A three-dimensional diagram of the central structure.

[0016] In the figure, 1. pump body; 2. water-proof jacket; 3. sealing chamber; 4. water transport chamber; 5. stator assembly; 6. rotor assembly; 7. impeller; 8. stator winding; 9. main body; 10. first opening; 11. second opening; 12. annular mounting portion; 13. graphite ring; 14. impeller body; 15. bottom plate; 16. main blades; 17. guide blades; 18. outer shell; 19. cover; 20. mounting portion; 21. sealing ring; 22. connecting portion; 23. inlet; 24. outlet. DETAILED DESCRIPTION

[0017] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0018] like Figures 1 to 7 As shown, a water pump with an external rotor motor of the present invention comprises: a body, a water blocking sleeve 2 , a stator assembly 5 , a rotor assembly 6 and an impeller 7 .

[0019] Specifically, the water-blocking sleeve 2 is sealed and connected in the pump body 1, a sealed chamber 3 is constructed between one end of the water-blocking sleeve 2 and the pump body 1, and a water transport chamber 4 is constructed between the other end of the water-blocking sleeve 2 and the pump body 1; the stator assembly 5 is connected in the sealed chamber 3; the rotor assembly 6 is rotatably connected in the water transport chamber 4 and is sleeved on the outside of the stator assembly 5, wherein an impeller 7 is integrally formed on the rotor assembly 6, and the impeller 7 is rotatably connected in the water transport chamber 4 to promote the flow of liquid in the water transport chamber 4.

[0020] In this embodiment, the stator assembly 5 drives the rotor assembly 6 to rotate after being energized, and the rotor assembly 6 drives the impeller 7 when rotating, so as to promote the flow of liquid in the water transport chamber 4. Since the rotor assembly 6 is placed in the water transport chamber 4, the liquid in the water transport chamber 4 can promptly take away the heat generated by the rotor assembly 6, so that the water pump can operate stably at high power without worrying about the overheating of the rotor assembly 6. In addition, the rotor assembly 6 and the impeller 7 are designed to be integrally formed, which ensures the precise coaxiality between the impeller 7 and the rotor assembly 6, so that the impeller 7 will not move radially during the rotation process, thereby reducing the noise when the water pump is working. The integral forming between the rotor assembly 6 and the impeller 7 can be achieved by pre-embedded injection molding.

[0021] Furthermore, a stator winding 8 is wound on the stator assembly 5 , and an end of the stator winding 8 abuts against the inner wall of the waterproof jacket 2 .

[0022] In this solution, the sealed cavity 3 is mainly used to protect the stator assembly 5 and ensure that the stator winding 8 is not affected by the external liquid environment. The end of the stator winding 8 is against the watertight sleeve 2. This design is mainly to reduce the volume of the sealed cavity 3 as much as possible, thereby achieving the goal of reducing the volume of the entire water pump body 1, so that it can adapt to a narrower working environment.

[0023] The watertight sleeve 2 includes a main body 9 with a double-layer structure. The inner structure of the main body 9 has a first opening 10 facing the sealing chamber 3, and the outer structure of the main body 9 has a second opening 11 facing the water transport chamber 4. An annular mounting portion 12 is formed between the inner and outer structures of the main body 9. The rotor assembly 6 is rotatably connected in the annular mounting portion 12. The annular mounting portion 12 is mainly used to limit the range of movement of the rotor assembly 6 to reduce its radial movement. The double-layer structure of the main body 9 is used to significantly save space in the water pump while ensuring the sealing of the sealing chamber 3.

[0024] A graphite ring 13 is integrally formed in the annular mounting portion 12 , and the graphite ring 13 is slidably matched with the stator assembly 5 .

[0025] The graphite ring 13 is constructed in a pre-embedded injection-molded structure at the bottom of the watertight sleeve 2, and rubs against the bottom of the rotor assembly 6 during the rotation of the rotor assembly 6, thereby ensuring the full life operation of the motor.

[0026] The impeller 7 includes an impeller body 14 and a base plate 15 connected between the impeller body 14 and the rotor assembly 6. The impeller body 14 is provided with a plurality of main blades 16. The base plate 15 is provided with a guide blade 17 at one end facing the impeller body 14. The guide blade 17 extends in the same direction as the main blade 16.

[0027] The main blades 16 on the impeller body 14 are the main force to promote the flow of liquid in the water transport chamber 4, while the guide blades 17 on the bottom plate 15 play an auxiliary role, used to cooperate with the main impeller 7 to guide and extend, thereby improving the impeller 7's efficiency in transporting liquid.

[0028] The pump body 1 includes an outer shell 18 and a cover 19 . The outer side wall of the main body 9 extends outward to form a mounting portion 20 . A sealing ring 21 is connected between the mounting portion 20 and the cover 19 , and between the mounting portion 20 and the outer shell 18 .

[0029] Preferably, the outer shell 18 and the cover 19 are threadedly connected to facilitate the installation of the water pump and subsequent disassembly and maintenance. The sealing ring 21 between the mounting portion 20 and the outer shell 18 is used to seal the sealing cavity 3. The sealing ring 21 between the mounting portion 20 and the cover 19 is used to seal the water transport cavity 4 to prevent leakage of liquid in the water transport cavity 4.

[0030] Preferably, a columnar connecting portion 22 is configured in the outer shell 18 , and the stator assembly 5 is fixed on the connecting portion 22 , so as to achieve fixation of the stator assembly 5 in the pump body 1 .

[0031] An inlet 23 and an outlet 24 are formed on the cover 19 , and both the inlet 23 and the outlet 24 are communicated with the water transport chamber 4 .

[0032] In this solution, liquid enters the water transport chamber 4 from the inlet 23. As the rotor assembly 6 drives the impeller 7 to rotate in the water transport chamber 4, the liquid is pushed out from the outlet 24, completing the liquid transportation process.

[0033] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0034] In addition, in the present invention, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0037] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways without departing from the scope defined by the spirit of the present invention.

Claims

1. A water pump with an outer rotor motor, characterized in that: include: Pump body; A water-blocking sleeve is sealed and connected to the pump body, a sealing cavity is formed between one end of the water-blocking sleeve and the pump body, and a water-conveying cavity is formed between the other end of the water-blocking sleeve and the pump body; a stator assembly connected in the sealed cavity; A rotor assembly is rotatably connected in the water transport cavity and sleeved on the outer side of the stator assembly, wherein: An impeller is integrally formed on the rotor assembly, and the impeller is rotatably connected in the water transport cavity to promote the flow of liquid in the water transport cavity.

2. A water pump with an outer rotor motor as claimed in claim 1, characterized in that: The stator assembly is wound with a stator winding, and the end of the stator winding abuts against the inner wall of the waterproof sleeve.

3. A water pump with an outer rotor motor as claimed in claim 1, characterized in that: The watertight sleeve includes a main body with a double-layer structure, the inner layer structure of the main body has a first opening facing the sealing cavity, the outer layer structure of the main body has a second opening facing the water transport cavity, an annular mounting portion is formed between the inner layer structure and the outer layer structure of the main body, and the rotor assembly is rotatably connected in the annular mounting portion.

4. A water pump with an outer rotor motor as claimed in claim 3, characterized in that: A graphite ring is integrally formed in the annular mounting portion, and the graphite ring is slidably matched with the stator assembly.

5. A water pump with an outer rotor motor as claimed in claim 1, characterized in that: The impeller includes an impeller body and a base plate connected between the impeller body and the rotor assembly. The impeller body is provided with a plurality of main blades. The base plate is provided with a guide blade at one end facing the impeller body. The guide blade has the same extension direction as the main blade.

6. A water pump with an outer rotor motor as claimed in claim 3, characterized in that: The pump body comprises an outer shell and a cover. The outer side wall of the main body extends outward to form a mounting portion. A sealing ring is connected between the mounting portion and the cover, and between the mounting portion and the outer shell.

7. A water pump with an outer rotor motor as claimed in claim 6, characterized in that: A columnar connecting portion is configured in the outer shell, and the stator assembly is fixed on the connecting portion.

8. A water pump with an outer rotor motor as claimed in claim 6, characterized in that: The cover is provided with an inlet and an outlet, and both the inlet and the outlet are communicated with the water transport cavity.

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