Direct-current brushless water pump

Abstract

The utility model provides a direct-current brushless water pump which comprises a pump shell, a water pump, a direct-current motor, a direct-current motor and a direct-current motor, the pump shell comprises a pump head and a shell main body, the pump head is provided with a first cavity, a water inlet channel and a water outlet channel, and the shell main body is internally provided with a second cavity; the shell main body is provided with a nut seat, and the pump head is matched with a nut in the nut seat through a screw and is fixed at the head end of the shell main body; the rotor assembly comprises a rotor main body and a shaft core, the rotor main body comprises a main support, a flux sleeve and a permanent magnet block, the main support comprises a pressurizing part and a driving section, and the rotor main body is assembled on the pump shell through the shaft core in the mode that the pressurizing part is located in the first cavity and the driving section is located in the second cavity; the water inlet cavity of the pressurizing part is communicated with the water inlet channel of the pump head, and the plurality of water outlets of the pressurizing part are respectively communicated with the water outlet channel through the first cavity of the pump head. According to the direct-current brushless water pump, the direct-current brushless water pump is easy to assemble, the bonding strength of the pump head and the shell body is high, and the output torque of the rotor can be improved.

Description

Technical Field

[0001] The utility model relates to the field of water pumps, and more specifically, to a DC brushless water pump. Background Art

[0002] A DC brushless water pump is a pump product that uses a brushless DC motor as a drive source and is widely used in various occasions that require precise control of fluid transportation. The pump housing body of the existing DC brushless water pump generally includes a rotor cavity and an impeller cavity. After assembling accessories such as a rotor and an impeller into the rotor cavity and the impeller cavity respectively, the pump cover needs to be installed on the pump housing body by means of gluing, snap connection, etc. However, the bonding strength between the above-mentioned pump cover and the pump housing body is relatively low, and the pump cover is prone to falling off in some special occasions or after long-term use.

[0003] Moreover, in the above-mentioned DC brushless water pump, due to volume limitations and considering its working environment, the rotor generally uses a plastic bracket, and the permanent magnet blocks are directly bonded or injection-molded on the plastic bracket, which results in relatively insufficient output torque of the rotor. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a new DC brushless water pump for the problems that the pump cover of the above-mentioned DC brushless water pump is prone to falling off in special occasions or after long-term use, and the output torque of the rotor is relatively insufficient.

[0005] The technical solution of the utility model to solve the above technical problems is to provide a DC brushless water pump, including:

[0006] A pump housing, including a pump head and a housing body. The pump head is provided with a first cavity, a water inlet channel separated from the first cavity, and a water outlet channel communicated with the first cavity. The housing body has a second cavity, and the opening of the second cavity is located at the first end of the housing body. The outer wall of the first end of the housing body has a plurality of axially arranged nut seats, and the plurality of nut seats are evenly distributed along the circumferential direction of the housing body. The pump head has a plurality of first fixing holes corresponding to the nut seats. The pump head is fixed to the first end of the housing body by a plurality of screws passing through the first fixing holes and respectively threadedly connected to the nuts in the nut seats of the housing body, and the first cavity and the water inlet channel are respectively communicated with the second cavity;

[0007] The rotor assembly includes a rotor main body and a shaft core. The rotor main body includes a main bracket, a magnetic conductive sleeve, and a plurality of permanent magnet blocks. The main bracket includes a pressing part formed at the head end and in a disc shape, and a driving section away from the pressing part and in a cylindrical shape. The pressing part includes a water inlet cavity, a plurality of water outlet ports, and a plurality of pressing channels, and the water inlet cavity is respectively communicated with the plurality of water outlet ports through the plurality of pressing channels. The magnetic conductive sleeve is sleeved on the driving section, and the plurality of permanent magnet blocks are sequentially arranged on the surface of the magnetic conductive sleeve along the circumferential direction of the driving section to form a driving part, and the polar directions of adjacent permanent magnet blocks are opposite. The rotor main body is assembled to the pump housing through the shaft core in such a way that the pressing part is located in the first cavity and the driving section is located in the second cavity, and the water inlet cavity of the pressing part is communicated with the water inlet channel of the pump head, and the plurality of water outlet ports of the pressing part are respectively communicated with the water outlet channel through the first cavity of the pump head.

[0008] As a further improvement of the present utility model, the opening of the water inlet cavity is located at the center of the end face of the pressing part, and the plurality of water outlet ports are evenly distributed on the side face of the pressing part; the water inlet channel on the pump head is communicated with the water inlet cavity after passing through the first cavity.

[0009] As a further improvement of the present utility model, the inlet of the water inlet channel protrudes from the edge of the side part of the pump head, and the water inlet channel extends from the edge of the side part of the pump head to the center of the pump head;

[0010] The first cavity surrounds the outlet of the water inlet channel, and the water outlet channel extends from the edge of the first cavity to the outer periphery of the pump head and protrudes from the edge of the side part of the pump head to form a water spraying port, and the water spraying port of the water outlet channel and the inlet of the water inlet channel are in opposite directions.

[0011] As a further improvement of the present utility model, the center line of each pressing channel is arc-shaped, and from the water inlet cavity to the water outlet port, the cross-sectional area of the pressing channel gradually increases.

[0012] As a further improvement of the present utility model, the pressing part includes a first disc and a second disc. The upper surface of the first disc has a plurality of arc-shaped first ribs, and the lower surface of the second disc has a plurality of arc-shaped second ribs. The second disc and the first disc are fixed together in such a way that the top surface of the second rib is connected to the top surface of the first rib, and a plurality of the pressing channels are formed between the first disc and the second disc.

[0013] As a further improvement of the present utility model, the main bracket includes a central through hole axially arranged, and a graphite sleeve integrally injection-molded with the main bracket is provided in the central through hole; a first shaft seat is provided at the bottom of the second cavity, a second shaft seat is provided on the pump head, the shaft core passes through the graphite sleeve, and two end portions of the shaft core are respectively embedded in the first shaft seat and the second shaft seat.

[0014] As a further improvement of the present utility model, a convex ring is provided at the center of the end face of the pressurizing portion, and an opening of the water inlet cavity is formed by the top end of the convex ring; a convex column is formed at the tail end of the water inlet channel of the pump head, and when the pump head is fixed to the housing main body, the second shaft seat is located on the convex column.

[0015] As a further improvement of the present utility model, the diameter of the second cavity is adapted to the diameter of the driving portion, and the diameter of the pressurizing portion is larger than the diameter of the second cavity.

[0016] As a further improvement of the present utility model, the brushless water pump includes a stator assembly, the housing main body includes a stator cavity isolated from the second cavity, an opening of the stator cavity is located at the tail end of the housing main body, and the stator assembly is installed in a part of the stator cavity surrounding the second cavity.

[0017] As a further improvement of the present utility model, a flange is formed at the head end of the housing main body, and a plurality of second fixing holes are provided on the flange; a plurality of the nut seats are respectively connected to a side of the flange facing away from the pump head, each nut seat includes a hexagonal prism groove with an opening at one end facing away from the pump head and communicating with the second fixing hole, and the size of the cross section of the hexagonal prism groove is adapted to the size of the nut.

[0018] The present utility model has the following beneficial effects: By providing nut seats on the housing main body of the pump housing, and fixing the pump head to the pump housing with screws passing through the first fixing holes on the pump head and threadedly connected to the nuts in the nut seats, and at the same time, the rotor main body is integrated with a pressurizing portion and a magnetic conductive sleeve is added to the main bracket of the rotor main body, the assembly of the DC brushless water pump is simple, the bonding strength between the pump head and the housing main body is relatively high, and the output torque of the rotor can be increased under the same input power. Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of a DC brushless water pump provided by an embodiment of the present utility model.

[0020] Figure 2 is an exploded structural diagram of a DC brushless water pump provided by an embodiment of the present utility model.

[0021] Figure 3 is a schematic cross-sectional structural diagram of a DC brushless water pump provided by an embodiment of the present utility model.

[0022] Figure 4 It is a schematic structural view of the rotor main body in the DC brushless water pump provided by the embodiment of the present utility model.

[0023] Figure 5 It is a schematic cross-sectional structural view of the rotor main body in the DC brushless water pump provided by the embodiment of the present utility model.

[0024] Figure 6 It is a schematic exploded structural view of the rotor main body in the DC brushless water pump provided by the embodiment of the present utility model. Detailed implementation manners

[0025] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0026] Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The present specification and claims do not use the difference in names as a way to distinguish components, but use the difference in functions of components as the criterion for distinction. As mentioned throughout the specification and claims, "including" is an open-ended term and should be interpreted as "including but not limited to". "Substantially" means within an acceptable error range. Those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0027] In the description of the application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0028] In the description of the present application, unless otherwise clearly specified and limited, the terms "first", "second", "third" are only used for the purpose of description and cannot be understood as indicating or implying relative importance; the term "plurality" means two or more; unless otherwise specified or stated, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0029] Such as Figure 1, Figure 2 As shown, it is a schematic diagram of the DC brushless water pump provided by an embodiment of the present utility model. This DC brushless water pump can be applied to flush toilets, water purifiers, etc. The DC brushless water pump of this embodiment includes a pump housing 10 and a rotor assembly 20, wherein the rotor assembly 20 is installed inside the pump housing 10. Of course, similar to existing DC brushless water pumps, the above-mentioned DC brushless water pump also includes a stator assembly, a control circuit board, etc., and can realize the pressurized transportation of water through the rotation of the rotor assembly 20.

[0030] The above-mentioned pump housing 10 includes a housing main body 11 and a pump head 12. Both the housing main body 11 and the pump head 12 can be made of a polymer material (such as plastic, etc.) that is corrosion-resistant, has high strength, and is conducive to processing. Figure 3 As shown, a first cavity 121, a water inlet channel 122, and a water outlet channel 123 are provided on the pump head 12. Among them, the water inlet channel 122 is separated from the first cavity 121, and the water outlet channel 123 is in communication with the first cavity 121. The above-mentioned separation and communication refer to the relationship with the first cavity 121 after the pump head 12 is installed on the housing main body 11. A second cavity 111 is provided inside the housing main body 11. The opening of the second cavity 111 is located at the front end of the housing main body 11, and the outer wall of the front end of the housing main body 11 has a plurality of axially arranged nut seats 112, and the plurality of nut seats 112 are evenly distributed along the circumferential direction of the housing main body 11. The pump head 12 also has a plurality of first fixing holes corresponding to the nut seats 112. The pump head 12 is fixed to the front end of the housing main body 11 by passing through a plurality of screws 13, and each screw 13 passes through the first fixing hole from above the pump head 12 and is threadedly connected to a nut 15 inside the nut seat 112 of the housing main body 11. After the pump head 12 is installed on the housing main body 11, the first cavity 121 is in communication with the second cavity 111, and the outlet of the water inlet channel 122 leads to the second cavity 111. In addition, to improve the sealing performance, a sealing ring 14 can also be provided between the pump head 12 and the housing main body 11.

[0031] The rotor assembly 20 includes a rotor main body 21 and a shaft core 22. Figure 5As shown in the figure, the above-mentioned rotor body 21 includes a main bracket 211, a magnetic conductive sleeve 212, and a plurality of permanent magnet blocks 213. The main bracket 211 can be made of a polymer material (such as plastic) with high strength and easy processing. Specifically, the main bracket 211 includes an axial pressing part and a driving section. The pressing part is formed at the head end of the main bracket 211 and is disc-shaped, and the driving section is located at one end of the main bracket 211 away from the pressing part and is cylindrical. The diameter of the pressing part is larger than the diameter of the rest of the main bracket 211, while the diameter of the driving section is smaller than the diameter of the rest of the main bracket 211. The above-mentioned pressing part includes a water inlet cavity 216, a plurality of water outlet ports 217, and a plurality of pressurizing channels, and the water inlet cavity 216 is respectively connected to the plurality of water outlet ports 217 through the plurality of pressurizing channels. The magnetic conductive sleeve 212 is made of a magnetic conductive material such as iron, cobalt, nickel or their alloys. It is tubular and sleeved on the driving section of the main bracket 211. The thickness of the magnetic conductive sleeve 212 can be adjusted according to the input power and so on. The plurality of permanent magnet blocks 213 are sequentially arranged along the circumferential direction of the driving section on the surface of the magnetic conductive sleeve 212 to form a driving part, and the polar directions of adjacent permanent magnet blocks 213 are opposite. Particularly, after the magnetic conductive sleeve 212 and the permanent magnet blocks 213 are fixed to the driving section of the main bracket 211, their outer peripheries are flush with the outer periphery of the part of the main bracket 211 except the pressing part.

[0032] The shape and size of the above-mentioned first cavity 121 are adapted to the shape and size of the pressing part (for example, the shapes are the same, and the size of the first cavity 121 is slightly larger), and the shape and size of the second cavity 111 are adapted to the shape and size of the other parts of the rotor body (for example, the shapes are the same, and the size of the second cavity 111 is slightly larger). The above-mentioned rotor body 21 is assembled to the pump housing 10 through the shaft core 22 in such a way that the pressing part is located in the first cavity and the driving section is located in the second cavity. The water inlet cavity 216 of the pressing part is connected to the water inlet channel 122 of the pump head 12, and the plurality of water outlet ports 217 of the pressing part are respectively connected to the water outlet channel 123 through the first cavity 121 of the pump head 12. In this way, the water flowing in from the water inlet channel 123 first enters the water inlet cavity 216 of the pressing part. When the rotor body 21 rotates, the plurality of pressurizing channels of the pressing part will eject the water in the water inlet cavity 216 to the first cavity 121 through the plurality of water outlet ports 217 and form a relatively large pressure in the first cavity 121 (especially at the side wall of the first cavity 121, and the inlet of the water outlet channel 123 is located at the side wall of the first cavity 121), so that the water in the first cavity 121 flows out through the water outlet channel 123 at an accelerated speed.

[0033] In practical applications, to improve the structural strength, the above-mentioned main bracket 211, magnetic conductive sleeve 212, and a plurality of permanent magnet blocks 213 can be injection-molded together, so that the rotor body 21 is an integral structure, and the pressing part is also integrated on the rotor body 21, thus eliminating the need to set up a separate impeller, greatly facilitating the assembly of the DC brushless water pump, and at the same time avoiding the energy loss in the transmission between the impeller and the rotor.

[0034] The above-mentioned DC brushless water pump fixes the pump head 12 to the housing main body 11 by arranging a nut seat 112 on the housing main body 11 of the pump housing 10 and using a screw 13 that passes through the first fixing hole on the pump head 12 and is threadedly connected to the nut 15 in the nut seat 112. That is, a metal part is used to connect the pump head 12 and the housing main body 11. At the same time, the rotor main body 21 is integrated with a pressurizing part and a magnetic conductive sleeve 212 is added to the main bracket 211 of the rotor main body, making the assembly of the DC brushless water pump simple, the bonding strength between the pump head and the housing main body relatively high, and the output torque of the rotor can be increased under the same input power. According to experiments, compared with the structure without the magnetic conductive sleeve, after adding the magnetic conductive sleeve 212, the output torque of the rotor assembly can be increased by 5-15% under the same input power.

[0035] In an embodiment of the present invention, a flange 114 is formed at the head end of the housing main body 11, and a plurality of second fixing holes are provided on the flange 114; a plurality of nut seats 112 are respectively connected to the side of the flange 114 facing away from the pump head 12, and each nut seat 112 includes a hexagonal prism groove with an opening at the end facing away from the pump head 12 and communicating with the second fixing hole, and the size of the cross-section of the hexagonal prism groove is adapted to the size of the nut 15.

[0036] As Figure 4 、 Figure 5 shown, in an embodiment of the present invention, the opening of the water inlet cavity 216 of the pressurizing part of the main bracket 211 is located at the center of the end face of the pressurizing part, and a plurality of water outlet ports 217 are evenly distributed on the side of the pressurizing part. Correspondingly, the water inlet channel 122 on the pump head 12 passes through the first cavity 121 and is connected to the water inlet cavity 216. That is, the water inlet channel 122 is separated from the first cavity 121 by the channel wall in the pump head 12 and the side wall of the water inlet cavity 216 on the main bracket 211.

[0037] The above structure is beneficial to reducing the volume of the pump housing 10, and at the same time can increase the water pressure in the first cavity 121 and increase the water output flow.

[0038] In an embodiment of the present invention, the entrance of the water inlet channel 122 protrudes from the edge of the side of the pump head 12, and the water inlet channel 122 extends from the edge of the side of the pump head 12 to the center of the pump head 12. The first cavity 121 surrounds the outlet of the water inlet channel 122, that is, the first cavity 121 is located at the center of the pump head 12, and the water outlet channel 123 extends from the edge of the first cavity 121 and protrudes from the edge of the side of the pump head 12 to form a water spray port, and the water spray port of the water outlet channel 123 and the entrance of the water inlet channel are in opposite directions.

[0039] The above structure can facilitate the connection of the DC brushless water pump to the water inlet pipe and the water outlet pipe, and reduce the requirements for the installation space of the DC brushless water pump. In addition, internal threads can be provided at the entrance of the water inlet passage 122 and the water spray port of the water outlet passage 123, so as to facilitate the connection of corresponding pipes or joints. Of course, in practical applications, the first cavity 121, the water inlet passage 122, and the water outlet passage 123 can also adopt other layout methods.

[0040] In the pressurizing part of the above-mentioned rotor body 21, each pressurizing flow channel is arc-shaped, and from the water inlet cavity 216 to the water outlet 217, the cross-sectional area of the pressurizing flow channel gradually increases, that is, the pressurizing flow channel is trumpet-shaped. When the rotor body 21 rotates, the side wall of the pressurizing flow channel pushes the water flow in the pressurizing flow channel to flow from the water inlet cavity 216 to the water outlet 217, and the trumpet-shaped pressurizing flow channel can reduce the resistance in the forward direction of the water flow, which is beneficial to the water flow flowing out of the water outlet quickly into the first cavity 121.

[0041] As Figure 6 shown, in an embodiment of the present invention, the above-mentioned pressurizing part includes a first disc 2111 and a second disc 2112. The upper surface of the first disc 2111 has a plurality of arc-shaped first ribs 2111a, and the lower surface of the second disc 2112 has a plurality of arc-shaped second ribs 2112a. The second disc 2112 and the first disc 2111 are fixed together in such a way that the top surface of the second rib 2112a is connected to the top surface of the first rib 2111a (for example, bonded together by ultrasonic welding), and a plurality of pressurizing flow channels are formed between the first disc 2111 and the second disc 2112.

[0042] Compared with the way of pushing water flow for pressurization by an ordinary impeller, the above structure can avoid energy loss during the rotation of the impeller and increase the water output flow under the same input power. In particular, on the above-mentioned first disc 2111, the central angle between the starting point (i.e., the position adjacent to the water inlet cavity) and the ending point (i.e., the position adjacent to the water outlet) of each first rib 2111a (the first rib 2111a and the second rib 2112a have the same shape) is greater than 60°, which is beneficial to pressurizing the water flow.

[0043] Combined with Figure 3 、 Figure 5As shown in the figure, in an embodiment of the present utility model, the main bracket 211 of the rotor body 21 includes a central through hole 218 axially arranged, and a graphite sleeve 214 integrally injection-molded with the main bracket 211 is provided in the central through hole 218 (the graphite sleeve 214 is processed from graphite material). An axial hole 219 is formed by enclosing the inner wall of the graphite sleeve 214, and the size of the axial hole 219 is adapted to the size of the shaft core 22. Correspondingly, a first shaft seat 1111 is provided at the bottom of the second cavity 111, a second shaft seat 126 is provided on the pump head 12, the shaft core 22 passes through the axial hole 219 on the graphite sleeve 214, and both end portions of the shaft core 22 are respectively embedded in the first shaft seat 1111 and the second shaft seat 126, thereby assembling the rotor body 21 in the pump housing 10.

[0044] Due to its shape and material properties, the above-mentioned graphite sleeve 214 can ensure the stable rotation of the rotor body 21 relative to the shaft core 22 while making the frictional force between it and the shaft core 22 relatively small. In addition, in order to prevent the rotor body 21 from moving up and down during rotation, and also to avoid the graphite sleeve 214 from contacting and wearing the pump housing 10 during the movement of the rotor body 21, a ceramic gasket 23 can be respectively provided at both ends of the graphite sleeve 214. And, the length of the graphite sleeve 214 can be slightly less than the length of the central through hole 218 of the main bracket 211, so as to form a groove at the bottom of the main bracket 211. One of the ceramic gaskets 23 can be located in this groove. At the same time, the side wall of the first shaft seat 111 can be embedded in this groove to support the rotor body 21 and improve the assembly stability of the rotor body 21.

[0045] In an embodiment of the present utility model, a convex ring 2112b is provided at the center of the end face of the pressurizing portion, and an opening of the water inlet cavity 216 is formed by the top end of the convex ring 2112b. Correspondingly, a convex column 125 is formed at the tail end of the water inlet channel 122 of the pump head 12 (for example, the convex column 125 can extend out from the water inlet channel 122). When the pump head 12 is fixed to the housing body 11, the convex column 125 is inserted into the water inlet cavity 216, and the second shaft seat 126 is located on the convex column 125, thereby facilitating the assembly of the rotor assembly 20.

[0046] The above-mentioned DC brushless water pump further includes a stator assembly 30. The housing body 11 includes a stator cavity 113 isolated from the second cavity 111, and the opening of the stator cavity 113 is located at the tail end of the housing body 11, that is, the opening of the stator cavity 113 and the second cavity 111 are respectively located on two opposite end faces of the housing body 11. The stator assembly 30 is installed in the part of the stator cavity 113 surrounding the second cavity 111 via the tail end of the housing body 11.

[0047] In addition, a control circuit board 40 can be installed in the stator cavity 113 described above, and the control circuit board 40 is electrically connected to the windings on the stator assembly 30. At the tail end of the housing body 11, there is a bottom cover 16, and the stator cavity 113 is sealed by the bottom cover 16 at its opening. Moreover, to improve the waterproof performance, the stator cavity 113 can be potted with potting glue. The stator assembly 30 and the control circuit board 40 can adopt the conventional techniques in the art and will not be elaborated here.

[0048] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A DC brushless water pump, characterized in that: include: A pump casing, comprising a pump head and a casing body, wherein the pump head is provided with a first cavity, a water inlet channel separated from the first cavity, and a water outlet channel communicated with the first cavity, the casing body is provided with a second cavity, and the opening of the second cavity is located at the head end of the casing body; the outer wall of the head end of the casing body is provided with a plurality of axially arranged nut seats, and the plurality of nut seats are evenly distributed along the circumference of the casing body; the pump head is provided with a plurality of first fixing holes corresponding to the nut seats, the pump head is fixed to the head end of the casing body by a plurality of screws passing through the first fixing holes and respectively threadedly connected with nuts in the nut seats of the casing body, and the first cavity and the water inlet channel are respectively communicated with the second cavity; A rotor assembly comprises a rotor body and an axis core, wherein the rotor body comprises a main bracket, a magnetic sleeve and a plurality of permanent magnet blocks, wherein the main bracket comprises a pressurizing portion formed at the head end and in a disc shape and a driving section away from the pressurizing portion and in a cylindrical shape; the pressurizing portion comprises a water inlet cavity, a plurality of water outlets and a plurality of pressurizing channels, and the water inlet cavity is connected with the plurality of water outlets through the plurality of pressurizing channels respectively; the magnetic sleeve is sleeved on the driving section, and the plurality of permanent magnet blocks are sequentially arranged on the surface of the magnetic sleeve along the circumference of the driving section to form a driving portion, and the polarity directions of adjacent permanent magnet blocks are opposite; the rotor body is assembled to the pump housing through the axis core in a manner that the pressurizing portion is located in the first cavity and the driving section is located in the second cavity, and the water inlet cavity of the pressurizing portion is connected with the water inlet channel of the pump head, and the plurality of water outlets of the pressurizing portion are connected with the water outlet channel through the first cavity of the pump head respectively.

2. The DC brushless water pump according to claim 1, characterized in that: The opening of the water inlet cavity is located at the center of the end surface of the pressurizing part, and the plurality of water outlets are evenly distributed on the side of the pressurizing part; the water inlet channel on the pump head passes through the first cavity and is connected to the water inlet cavity.

3. The DC brushless water pump according to claim 2, characterized in that: The inlet of the water inlet channel protrudes from the edge of the side of the pump head, and the water inlet channel extends from the edge of the side of the pump head to the center of the pump head; The first cavity surrounds the outlet of the water inlet channel, and the water outlet channel extends from the edge of the first cavity to the periphery of the pump head and protrudes from the edge of the side of the pump head to form a water spray port, and the water spray port of the water outlet channel and the entrance of the water inlet channel are in opposite directions.

4. The DC brushless water pump according to claim 2, characterized in that: The center line of each of the pressurized flow channels is arc-shaped, and the cross-sectional area of ​​the pressurized flow channels gradually increases from the water inlet cavity to the water outlet.

5. The DC brushless water pump according to claim 4, characterized in that: The pressurizing part includes a first disc and a second disc, the upper surface of the first disc has a plurality of first arc-shaped ribs, the lower surface of the second disc has a plurality of second arc-shaped ribs, and the second disc and the first disc are fixed together in such a way that the top surface of the second rib is connected to the top surface of the first rib, and a plurality of pressurizing channels are formed between the first disc and the second disc.

6. The DC brushless water pump according to claim 2, characterized in that: The main bracket includes an axially arranged central through hole, and a graphite sleeve injection-molded integrally with the main bracket is provided in the central through hole; the bottom of the second cavity has a first shaft seat, the pump head has a second shaft seat, the shaft core passes through the graphite sleeve, and the two ends of the shaft core are respectively embedded in the first shaft seat and the second shaft seat.

7. The DC brushless water pump according to claim 6, characterized in that: A convex ring is provided in the center of the end surface of the pressurizing part, and the opening of the water inlet cavity is formed by the top end of the convex ring; a convex column is formed at the tail end of the water inlet channel of the pump head, and when the pump head is fixed to the shell body, the second shaft seat is located on the convex column.

8. The brushless DC water pump according to any one of claims 1 to 7, characterized in that: The diameter of the second cavity is matched with the diameter of the driving part, and the diameter of the pressurizing part is larger than the diameter of the second cavity.

9. The brushless DC water pump according to any one of claims 1 to 7, characterized in that: The brushless water pump includes a stator assembly, the shell body includes a stator cavity isolated from the second cavity, the opening of the stator cavity is located at the rear end of the shell body, and the stator assembly is installed in the part of the stator cavity surrounding the second cavity.

10. The DC brushless water pump according to claim 9, characterized in that: A flange is formed at the head end of the shell body, and the flange has a plurality of second fixing holes; a plurality of nut seats are respectively connected to the side of the flange facing away from the pump head, and each of the nut seats includes a hexagonal prism groove whose opening is located at the end facing away from the pump head and is connected to the second fixing hole, and the size of the cross-section of the hexagonal prism groove is adapted to the size of the nut.

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