WO2022110344A1

WO2022110344A1 - Micro water pump

Info

Publication number: WO2022110344A1
Application number: PCT/CN2020/136487
Authority: WO
Inventors: 许德涛; 凌芳华
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声光电科技(常州)有限公司
Priority date: 2020-11-27
Filing date: 2020-12-15
Publication date: 2022-06-02
Also published as: CN214092345U

Abstract

A micro water pump, comprising: a housing (100) having an accommodating chamber (101), an impeller assembly (200) rotatably fixed in the accommodating chamber (101), a winding assembly (300) used for driving the impeller assembly (200) to rotate, and a flexible circuit board (400) electrically connected to the winding assembly (300). The housing (100) comprises a base (110) and an upper cover (120) covering the base (110); the side of the base (110) facing the upper cover (120) is recessed to form a recess (111); the bottom wall of the recess (111) protrudes toward the upper cover (120) to form an enclosing table (130); the base (110), the enclosing table (130), and the upper cover (120) together enclose the accommodating chamber (101); the enclosing table (130) comprises a top wall (131) and an enclosing wall (132) which is arranged spaced apart from the side wall of the recess (111); a stepped shaft (140) arranged spaced apart from the enclosing wall (132) is protrudingly provided on the top wall (131) in the direction away from the upper cover (120); the enclosing wall (132), the top wall (131), and the stepped shaft (140) together enclose a mounting chamber (133) which is used for fixing the winding assembly (300) and sealingly isolated from the accommodating chamber (101); the stepped shaft (140) comprises a first shaft portion (141) fixed on the top wall (131) and a second shaft portion (142) fixed on the first shaft portion (141); and the outer diameter of the first shaft portion (141) is larger than that of the second shaft portion (142), and the central axis of the first shaft portion (141) is the same as that of the second shaft portion (142).

Description

micro water pump

technical field

The present application relates to the technical field of pumps, in particular to a micro water pump.

Background technique

Some miniature water pumps in the related art drive the impeller assembly to rotate through the winding assembly, but the winding assembly is sleeved on a straight shaft. Due to the unreasonable structural design, the space for placing the winding assembly is too small, resulting in The number of turns of the coil is too small, so that the driving force of the winding assembly to the impeller assembly is too small, which in turn causes the performance of the micro water pump to be poor.

technical problem

Therefore, it is necessary to provide a new type of micro water pump to solve the above problems.

technical solutions

The purpose of this application is to provide a micro water pump with stronger driving force and better performance.

The technical solution of the present application is as follows: a miniature water pump, comprising a casing having a receiving cavity, an impeller assembly rotatably fixed in the receiving cavity, a winding assembly for driving the rotation of the impeller assembly, and the winding assembly Electrically connected flexible circuit boards;

The shell is provided with a water inlet channel and a water outlet channel which are respectively communicated with the accommodating cavity;

The housing includes a base and an upper cover that is covered on the base, a side of the base facing the upper cover is recessed to form a groove, and the bottom wall of the groove is convex toward the upper cover and form an enclosure, the base, the enclosure and the upper cover are enclosed to form the receiving cavity, the enclosure includes a top wall and an enclosure wall spaced apart from the side walls of the groove, the enclosure A stepped shaft is protruded from the top wall toward the direction away from the upper cover and is spaced from the surrounding wall, and the surrounding wall, the top wall and the stepped shaft are enclosed to form a shape for fixing the winding assembly and an installation cavity sealed and isolated from the receiving cavity;

The stepped shaft includes a first shaft portion fixed on the top wall and a second shaft portion fixed on the first shaft portion, and the outer diameter of the first shaft portion is larger than that of the second shaft portion. The outer diameter and the central axis of the first shaft portion and the second shaft portion are the same.

As an embodiment of the present application, the surrounding wall is an annular side wall, and the central axis of the annular side wall is the same as the central axis of the first shaft portion.

As an embodiment of the present application, the winding assembly includes an iron core sleeved on the second shaft portion and abutting on an end surface of the first shaft portion close to the second shaft portion, and an iron core wound around the second shaft portion A coil on the iron core and electrically connected with the flexible circuit board.

As an embodiment of the present application, the iron core includes an inner ring portion sleeved on the second shaft portion, a plurality of outer ring portions spaced apart from and parallel to the inner ring portion, and an outer ring portion for connecting Several of the outer ring parts and the inner ring parts are used for winding the connection parts of the coil.

As an embodiment of the present application, the number of turns of the coil wound on the connecting portion gradually decreases from the outer ring portion to the inner ring portion.

As an embodiment of the present application, the impeller assembly includes an impeller rotatably sleeved on the surrounding wall and a magnetic steel fixed on the impeller and located between the impeller and the surrounding wall.

As an embodiment of the present application, the micro water pump further includes a rotating shaft fixed to the impeller, one end of the stepped shaft close to the upper cover is recessed to form a blind hole, and the rotating shaft is rotatably installed on the blind hole inside the hole.

As an embodiment of the present application, the impeller includes a dome that is fixed to the rotating shaft and is spaced between the top wall and the upper cover, and is bent and extended from the outer periphery of the dome and is spaced apart A shaft sleeve part sleeved on the surrounding wall and a number of spaced blades arranged on the outer wall of the shaft sleeve part, the magnetic steel is annular, and the magnetic steel is fixed on the inner wall of the shaft sleeve part and is spaced apart from the surrounding wall.

As an embodiment of the present application, the base is recessed at the edge of the groove to form an annular groove communicating with the groove, and the upper cover is at a position corresponding to the annular groove and the groove. The recess forms an escape groove, and the vane is located at least partially within the annular groove.

As an embodiment of the present application, the micro water pump further includes a first sealing ring and a second sealing ring, the base faces the upper cover and/or the upper cover faces the base There is a first limit groove for installing the sealing ring, the annular groove is located inside the first limit groove, and the bottom wall of the avoidance groove is provided with a space for installing the second sealing ring. For the second limiting groove, when the upper cover is set on the base, the first sealing rings are respectively abutted on the base and the upper cover, and the second sealing rings are respectively abutted on the base and the upper cover. the top wall and the upper cover.

beneficial effect

The beneficial effects of this application are:

In the miniature water pump in the present application, an installation cavity for fixing the winding assembly is formed by enclosing a wall, a top wall and a stepped shaft; since the stepped shaft includes a first shaft portion fixed on the top wall and a first shaft portion fixed on the first shaft portion the second shaft part, and the outer diameter of the first shaft part is larger than the outer diameter of the second shaft part, and the central axis of the first shaft part and the second shaft part is the same; because the outer diameter of the second shaft part is smaller, further , compared with a straight shaft whose outer diameter is the same as the outer diameter of the first shaft portion, the use of the stepped shaft can make the volume of the installation cavity for installing the winding assembly larger, and thus the volume of the winding assembly that can be accommodated can be larger, and further It can improve the driving force of the winding assembly to the impeller assembly and improve the performance of the miniature water pump.

Description of drawings

1 is a schematic diagram of the overall structure of a micro water pump according to an embodiment of the application;

Fig. 2 is the exploded schematic diagram of the miniature water pump in Fig. 1;

FIG. 3 is a schematic structural diagram of the micro water pump in FIG. 1 from one viewing angle;

Fig. 4 is the sectional view at A-A place in Fig. 3;

Fig. 5 is one of the structural representations of the base in Fig. 1;

Fig. 6 is another one of the structural schematic diagrams of the base in Fig. 1;

Fig. 7 is one of the structural representations of the upper cover in Fig. 1;

FIG. 8 is a schematic structural diagram of the winding assembly in FIG. 1;

100, housing; 101, receiving cavity; 102, water inlet channel; 103, water outlet channel; 110, base; 111, groove; 112, annular groove; 113, first limit groove; 114, installation groove; 120, upper cover; 121, avoidance groove; 122, second limit groove; 130, enclosure; 131, top wall; 132, enclosure wall; 133, installation cavity; 140, stepped shaft; 141, first shaft part; 142, Second shaft part; 143, blind hole; 150, bolt; 200, impeller assembly; 210, impeller; 211, dome; 212, shaft sleeve part; 213, blade; 220, magnetic steel; 300, winding assembly; 310, Iron core; 311, inner ring part; 312, outer ring part; 313, connecting part; 320, coil; 400, flexible circuit board; 500, shaft; 600, first sealing ring; 700, second sealing ring; 800, wire.

Embodiments of the present invention

To further illustrate the various embodiments, the present application provides accompanying drawings. These drawings are part of the disclosure content of the present application, and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant description of the specification to explain the operation principles of the embodiments. With reference to these contents, one of ordinary skill in the art will understand other possible implementations and advantages of the present application. Components in the figures are not drawn to scale, and similar component symbols are often used to represent similar components.

The present application will be further described below with reference to the accompanying drawings and embodiments.

Please refer to FIG. 1 to FIG. 8 , the present application provides a micro water pump. The micro water pump in this embodiment includes a housing 100 having a receiving cavity 101 , an impeller assembly 200 rotatably fixed in the receiving cavity 101 , and used for The winding assembly 300 that drives the impeller assembly 200 to rotate is connected to the flexible circuit board 400 that is electrically connected to the winding assembly 300 .

Referring to FIG. 2 , in one embodiment, the housing 100 is provided with a water inlet channel 102 and a water outlet channel 103 , and the water inlet channel 102 and the water outlet channel 103 are respectively communicated with the accommodating cavity 101 , so that the inlet and outlet into the accommodating cavity 101 can be realized. The purpose of water and self-exiting water from the containing cavity 101 .

Please refer to FIG. 2 and FIG. 5 , preferably, the housing 100 includes a base 110 and an upper cover 120 disposed on the base 110 , preferably the upper cover 120 and the base 110 are fixedly connected by bolts 150 , and the base 110 faces the upper cover 120 The bottom wall of the groove 111 protrudes toward the upper cover 120 and forms an enclosure 130 . The base 110 , the enclosure 130 and the upper cover 120 are enclosed to form a receiving cavity 101 .

Preferably, the water inlet channel 102 and the water outlet channel 103 are formed on the base 110 , and further, the water inlet channel 102 and the water outlet channel 103 are formed on the same side wall of the base 110 .

Referring to FIG. 6 , in one embodiment, the enclosure 130 includes a top wall 131 and an enclosure wall 132 parallel to and spaced apart from the side walls of the groove 111 . The stepped shafts 140 provided at intervals by the surrounding wall 132, the surrounding wall 132, the top wall 131 and the stepped shaft 140 are enclosed to form an installation cavity 133 for fixing the winding assembly 300 and sealed from the receiving cavity 101; Sealing isolation, which in turn can prevent liquid from entering the mounting cavity 133 .

Referring to FIG. 2 and FIG. 5 , in one embodiment, the stepped shaft 140 includes a first shaft portion 141 fixed on the top wall 131 and a second shaft portion 142 fixed on the first shaft portion 141 . The first shaft portion The outer diameter of 141 is larger than the outer diameter of the second shaft portion 142 and the central axes of the first shaft portion 141 and the second shaft portion 142 are the same. In this embodiment, the stepped shaft 140 includes a first shaft portion 141 fixed on the top wall 131 and a second shaft portion 142 fixed on the first shaft portion 141 , and the outer diameter of the first shaft portion 141 is larger than that of the second shaft portion 141 . The outer diameter of the shaft portion 142, and the central axis of the first shaft portion 141 and the second shaft portion 142 are the same; since the outer diameter of the second shaft portion 142 is smaller, further, relative to the outer diameter of the first shaft portion 141 For a straight shaft with the same outer diameter, the use of the stepped shaft 140 can make the installation cavity 133 for installing the winding assembly 300 larger in volume, and thus the volume of the winding assembly 300 that can be accommodated can be larger, thereby improving the accuracy of the winding assembly 300 to the impeller assembly. 200 driving force to improve the performance of the micro water pump.

Preferably, the surrounding wall 132 is an annular side wall, and the central axis of the annular side wall is the same as the central axis of the first shaft portion 141 . The installation cavity 133 formed in this embodiment is an annular cavity, and its central axis is the same as the central axis of the first shaft portion 141 . Further, the winding components 300 installed in the installation cavity 133 can be evenly distributed in the installation cavity 133 . The impeller assembly 200 can apply a more uniform driving force.

Referring to FIGS. 2 and 8 , in one embodiment, the winding assembly 300 includes an iron core 310 sleeved on the second shaft portion 142 and abutting on an end surface of the first shaft portion 141 close to the second shaft portion 142 , and The coil 320 is wound on the iron core 310 and is electrically connected to the flexible circuit board 400 . In this embodiment, since the iron core 310 is sleeved on the second shaft portion 142 , and the outer diameter of the second shaft portion 142 is smaller than that of the first shaft portion 141 , the second shaft portion 142 has a smaller outer diameter than that of the first shaft portion 141 . In the radial direction, the length of the iron core 310 for winding the coil 320 can be longer, and thus the number of turns of the coil 320 can be increased, thereby improving the driving force of the winding assembly 300 to the impeller assembly 200 . In addition, since the iron core 310 abuts on the first shaft portion 141, the iron core 310 can be positioned accurately in the axial direction of the first shaft portion 141, and the coil 320 wound on the iron core 310 can be improved in the first Accuracy in the axial direction of the shaft portion 141 .

Referring to FIG. 8 , preferably, the iron core 310 includes an inner ring portion 311 sleeved on the second shaft portion 142 , a plurality of spaced apart outer ring portions 312 arranged parallel to and spaced from the inner ring portion 311 , and a plurality of outer ring portions 312 for connecting a plurality of The outer ring part 312 and the inner ring part 311 have several connecting parts 313 for winding the coil 320 . In this embodiment, the connecting portions 313 are distributed around the inner ring portion 311 at intervals, and the plurality of coils 320 wound on the plurality of connecting portions 313 are connected by a star connection method. Of course, the plurality of coils can also be connected by a delta connection method. 320 connected together.

In order to avoid the influence of the first shaft portion 141 on the coil 320, further preferably, the number of turns of the coil 320 wound on the connecting portion 313 gradually decreases from the outer ring portion 312 to the inner ring portion 311, and then the wound coil 320 The outer diameter gradually decreases from the outer ring portion 312 to the inner ring portion 311 .

It should be noted that the number of turns of the coil 320 gradually decreases from the outer ring portion 312 to the inner ring portion 311 , which may be a linear decrease or a non-linear decrease.

Referring to FIG. 2 , in one embodiment, the impeller assembly 200 includes an impeller 210 rotatably sleeved on the surrounding wall 132 and a magnetic steel 220 fixed on the impeller 210 and located between the impeller 210 and the surrounding wall 132 .

2 , specifically, the miniature water pump further includes a rotating shaft 500 fixed to the impeller 210 . One end of the stepped shaft 140 close to the upper cover 120 is recessed to form a blind hole 143 , and the rotating shaft 500 is rotatably installed in the blind hole 143 . In this embodiment, the impeller 210 is rotatably fixed on the stepped shaft 140 on the base 110 through the rotating shaft 500 .

Preferably, the central axis of the blind hole 143 and the central axis of the first shaft portion 141 are the same straight line.

Further, the groove 111 is a cylindrical groove 111, and the impeller 210 is in the shape of a center-symmetrical disk.

Referring to FIG. 2 , in one embodiment, the impeller 210 includes a dome 211 fixed to the rotating shaft 500 and disposed between the top wall 131 and the upper cover 120 at intervals, and a sleeve formed by bending and extending from the outer periphery of the dome 211 and spaced apart from the top wall 131 . The shaft sleeve portion 212 provided on the surrounding wall 132 and a plurality of blades 213 arranged at intervals on the outer wall of the shaft sleeve portion 212, the magnetic steel 220 is annular, and the magnetic steel 220 is fixed on the inner wall of the shaft sleeve portion 212 and is connected with the surrounding wall. 132 interval settings.

Preferably, the vanes 213 are arranged on the outer wall of the bushing portion 212 at uniform intervals around the bushing portion 212, so that the blades 213 can move the liquid more uniformly.

Please refer to FIG. 4 and FIG. 6 , in one implementation, the base 110 is recessed at the edge of the groove 111 to form an annular groove 112 communicating with the groove 111 , and the upper cover 120 is at a position corresponding to the annular groove 112 and the groove 111 . The recess forms an escape groove 121 , and the vane 213 is located at least partially within the annular groove 112 .

Please refer to FIG. 2 , FIG. 6 and FIG. 7 , in one embodiment, the micro water pump further includes a first sealing ring 600 and a second sealing ring 700 , the base 110 facing the upper cover 120 and/or the upper cover 120 facing One side of the base 110 is provided with a first limiting groove 113 for installing the sealing ring, the annular groove 112 is located inside the first limiting groove 113, and the bottom wall of the escape groove 121 is provided with a second sealing ring 700. In the second limiting groove 122, when the upper cover 120 is covered on the base 110, the first sealing ring 600 abuts on the base 110 and the upper cover 120 respectively, and the second sealing ring 700 abuts on the top wall 131 and the upper cover 120.

Specifically, the accommodating cavity 101 is formed by enclosing the base 110 , the first sealing ring 600 of the upper cover 120 and the enclosure 130 .

Referring to FIG. 2 and FIG. 5 , in one embodiment, the base 110 is further provided with a mounting slot 114 for fixing the flexible circuit board 400 , and the flexible circuit board 400 is connected to the coil 320 through wires 800 .

The above are only the embodiments of the present application. It should be pointed out that for those of ordinary skill in the art, improvements can be made without departing from the creative concept of the present application, but these belong to the present application. scope of protection.

Claims

A miniature water pump is characterized in that: it comprises a casing with an accommodating cavity, an impeller assembly rotatably fixed in the accommodating cavity, and a winding assembly for driving the rotation of the impeller assembly to be electrically connected to the winding assembly. Flexible circuit board;

The shell is provided with a water inlet channel and a water outlet channel which are respectively communicated with the accommodating cavity;

The housing includes a base and an upper cover that is covered on the base, a side of the base facing the upper cover is recessed to form a groove, and the bottom wall of the groove is convex toward the upper cover and form an enclosure, the base, the enclosure and the upper cover are enclosed to form the receiving cavity, the enclosure includes a top wall and an enclosure wall spaced apart from the side walls of the groove, the enclosure A stepped shaft is protruded from the top wall toward the direction away from the upper cover and is spaced from the surrounding wall, and the surrounding wall, the top wall and the stepped shaft are enclosed to form a shape for fixing the winding assembly and an installation cavity sealed and isolated from the receiving cavity;

The stepped shaft includes a first shaft portion fixed on the top wall and a second shaft portion fixed on the first shaft portion, and the outer diameter of the first shaft portion is larger than that of the second shaft portion. The outer diameter and the central axis of the first shaft portion and the second shaft portion are the same.
The miniature water pump according to claim 1, wherein the surrounding wall is an annular side wall, and the central axis of the annular side wall is the same as the central axis of the first shaft portion.
The micro water pump according to claim 2, wherein the winding assembly comprises an iron core sleeved on the second shaft portion and abutting on the end surface of the first shaft portion close to the second shaft portion and a coil wound on the iron core and electrically connected with the flexible circuit board.
The miniature water pump according to claim 3, wherein the iron core comprises an inner ring part sleeved on the second shaft part, and a plurality of outer ring parts spaced and parallel to the inner ring part and arranged at intervals. A ring portion and a plurality of connecting portions for winding the coil for connecting a plurality of the outer ring portions and the inner ring portions.
The micro water pump according to claim 4, wherein the number of turns of the coil wound on the connecting portion gradually decreases from the outer ring portion to the inner ring portion.
The miniature water pump according to claim 1, wherein the impeller assembly comprises an impeller rotatably sleeved on the surrounding wall and an impeller fixed on the impeller and located between the impeller and the surrounding wall between magnets.
The micro water pump according to claim 6, wherein the micro water pump further comprises a rotating shaft fixed to the impeller, one end of the stepped shaft close to the upper cover is recessed to form a blind hole, and the rotating shaft is rotatable installed in the blind hole.
The miniature water pump according to claim 7, wherein the impeller comprises a dome fixed with the rotating shaft and arranged at intervals between the top wall and the upper cover, and an outer peripheral edge from the dome A shaft sleeve part formed by bending and extending and sleeved on the surrounding wall at intervals and a number of blades arranged at intervals on the outer wall of the shaft sleeve part, the magnetic steel is annular, and the magnetic steel is fixed on the The inner wall of the shaft sleeve portion is spaced apart from the surrounding wall.
The micro water pump according to claim 8, wherein the base is recessed at the edge of the groove to form an annular groove communicating with the groove, and the upper cover is in contact with the annular groove and the groove. A recessed groove is formed at a position corresponding to the groove, and the blade is at least partially located in the annular groove.
The micro water pump according to claim 9, characterized in that: the micro water pump further comprises a first sealing ring and a second sealing ring, the base faces the side of the upper cover and/or the upper cover faces One side of the base is provided with a first limit groove for installing the sealing ring, the annular groove is located inside the first limit groove, and the bottom wall of the escape groove is provided with a space for installing the seal ring. The second limiting groove of the second sealing ring, when the upper cover is set on the base, the first sealing ring is respectively abutted on the base and the upper cover, and the second The sealing rings are respectively abutted on the top wall and the upper cover.