Space-saving single-unit multi-stage micro water pump

Abstract

The present invention discloses a space-saving single-machine multi-stage micro water pump, including a pump housing, a stator, a rotor and an impeller; the pump housing is provided with a housing chamber, a water inlet and a water outlet, and the water inlet and the water outlet are both connected to the housing chamber; the stator is fixedly installed in the housing chamber, and the housing chamber is provided with a pivot, and the pivot is located in the rotating magnetic field area of ​​the stator and extends along the axial direction of the pivot; the rotor is rotatably installed on the pivot, and the rotor is placed in the rotating magnetic field area of ​​the stator, and the rotating magnetic field generated by the stator drives the rotor to rotate; the impeller is rotatably sleeved on the pivot, and the impeller is provided with a first connecting piece, and the first connecting piece is connected to the rotor as a whole. The impeller does not need to use a shaft sleeve to limit the specific position between the impeller and the rotor, and does not need fasteners such as nuts to fix the impeller; the specific structure between the impeller and the rotor can be simplified to reduce the setting of parts, occupy less internal space of the water pump, reduce parts, and facilitate the assembly of the impeller and the rotor, thereby improving assembly efficiency.

Description

Technical Field

[0001] The invention relates to the field of water pump technology, in particular to a space-saving single-machine multi-stage micro water pump. Background Art

[0002] At present, a water pump is a device used to transport working fluid. When liquid such as water enters the water pump, the liquid is pressurized by the operation of the impeller inside the water pump, and then the liquid is sent out of the water pump to achieve the purpose of liquid transportation.

[0003] In the prior art, a water pump generally has a housing and a rotor, a rotor seat, an impeller, and a stator arranged in the housing. The rotor is installed in the rotating magnetic field of the stator, and a rotating shaft is installed on the rotor. The impeller is fixedly installed on the rotating shaft and rotates with the rotating shaft; the impeller and the rotating shaft also need to be limited by a sleeve and fastened with a nut. Too many parts are arranged, making the structure complicated and occupying a lot of space, resulting in that the overall structure of the water pump cannot be made smaller; secondly, an assembly gap is easily generated between the impeller and the rotating shaft, resulting in a large coaxiality deviation between the impeller and the rotating shaft; when the rotating shaft drives the impeller, vibration is easily generated, resulting in unstable operation of the water pump and loud noise during operation of the water pump. Summary of the invention

[0004] In view of this, the present invention aims at the deficiencies in the prior art, and its main purpose is to provide a space-saving single-unit multi-stage micro water pump with a reasonable structure, which effectively solves the problems of complex structure and unstable operation of the existing water pumps.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A space-saving micro water pump comprises a pump casing, a stator, a rotor and an impeller; the pump casing is provided with a accommodating chamber, a water inlet and a water outlet, and the water inlet and the water outlet are both connected to the accommodating chamber; the stator is fixedly mounted on the accommodating chamber, and the accommodating chamber is provided with a pivot, and the pivot is located in the rotating magnetic field area of ​​the stator and extends along the axial direction of the pivot; the rotor is rotatably mounted on the pivot, and the rotor is placed in the rotating magnetic field area of ​​the stator, and the rotating magnetic field generated by the stator drives the rotor to rotate; the impeller is rotatably sleeved on the pivot, and the impeller is provided with a first connecting piece, and the first connecting piece is connected to the rotor as a whole.

[0007] As a preferred solution: the pivot is extended upwardly from the bottom of the accommodating cavity, a rotor seat is rotatably provided at the bottom of the pivot, and the rotor is fixedly mounted on the rotor seat.

[0008] As a preferred solution: bearings are provided at the top and bottom of the pivot, and the rotor seat and the impeller are sleeved between the two bearings.

[0009] As a preferred solution: a connecting recess is provided on the peripheral side surface of the first connecting member, an axial hole passes through the middle of the rotor, and the connecting recess is inserted into the axial hole to be integrally formed with the rotor.

[0010] As a preferred solution: the pump casing includes a main body casing, an upper end cover and a lower end cover, the upper end cover and the lower end cover are installed corresponding to the top and bottom of the main body casing respectively; the water inlet is arranged at the lower end cover, and the water outlet is arranged at the upper end cover.

[0011] As a preferred solution: the accommodating cavity includes a first cavity, a second cavity and a third cavity;

[0012] The second cavity is arranged at the periphery of the first cavity, and the third cavity is arranged at the top of the first cavity;

[0013] The first cavity is provided with an upward opening to communicate with the third cavity, the pivot is installed at the center of the first cavity and extends to the third cavity; the rotor is placed in the first cavity, and the impeller is placed in the third cavity;

[0014] The second cavity is provided with a downward opening and a sealing end cover is installed at the opening; the second cavity, the first cavity and the pivot are coaxially arranged, and the stator is installed in the second cavity.

[0015] As a preferred solution: the main body shell is provided with a water flow channel, and the water flow channel is located outside the second cavity; one end of the water flow channel is connected to the water inlet, and the other end is connected to the first cavity and the third cavity.

[0016] As a preferred solution: the third cavity is provided with a middle cover, a concave cavity is provided at the edge of the top of the middle cover, and the impeller is arranged above and / or below the middle cover.

[0017] As a preferred solution: the impellers are provided with more than two groups, each group of impellers is stacked along the pivot, the impellers of the bottom group are connected to the rotor through a first connecting piece, and the impellers of the upper group are assembled with the impellers of the lower group through a second connecting piece extending from the lower end.

[0018] As a preferred solution: each set of impellers includes an upper wheel piece and a lower wheel piece, one of the upper wheel piece and the lower wheel piece is provided with a convex strip, and the other is provided with a groove, and the convex strip extends up and down and abuts against the groove.

[0019] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical scheme that: mainly, the impeller is directly connected to the rotor, and the impeller rotates synchronously with the rotor; compared with the connection method between the impeller and the rotor in the traditional water pump, the impeller does not need to use a shaft sleeve to limit the specific position between the impeller and the rotor, and does not need nuts and other fasteners to fix the impeller; on the one hand, the specific structure between the impeller and the rotor can be simplified to reduce the setting of parts, occupy less internal space of the water pump, and the overall structure of the water pump can be further reduced; on the other hand, the reduction of parts can facilitate the assembly of the impeller and the rotor, thereby improving the assembly efficiency;

[0020] At the same time, the impeller is integrally connected to the rotor by the first connecting member; compared with the traditional way of assembling on the rotating shaft, the assembly gap between the impeller and the main shaft, and between the rotor and the main shaft can be reduced; it is conducive to controlling the coaxiality requirements between the impeller and the rotor, ensuring the coaxiality accuracy of the impeller and the rotor, thereby improving the stability of the impeller and the rotor during rotation, making it less likely to vibrate, improving the stability of the water pump during operation, and also helping to reduce the noise of the water pump during operation;

[0021] Secondly, a pivot is fixedly arranged, and the impeller and the rotor are rotatably sleeved on the pivot, which is beneficial to further improve the stability of the impeller and the rotor during rotation;

[0022] Furthermore, by virtue of the connection relationship between the rotor and the impeller and the stacked assembly relationship of the impellers, multiple sets of impellers can be freely stacked according to actual needs to obtain products with different performances, which is conducive to mass production; for multi-impeller water pumps, traditional technology requires the configuration of more than two motors, while in this application only one motor is needed to meet the demand, saving the motor configuration cost and also saving the overall design space of the water pump.

[0023] In order to more clearly illustrate the structural features and effects of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the three-dimensional structure of a micro water pump according to the first embodiment of the present invention;

[0025] Figure 2 is an exploded view of a micro water pump according to the first embodiment of the present invention;

[0026] Figure 3 is another exploded view of the micro water pump according to the first embodiment of the present invention;

[0027] Figure 4 is a first cross-sectional view of a micro water pump according to a first embodiment of the present invention;

[0028] Figure 5is a second cross-sectional view of the micro water pump according to the first embodiment of the present invention;

[0029] Figure 6 is a schematic diagram of the three-dimensional structure of the rotor and the impeller of the first embodiment of the present invention;

[0030] Figure 7 yes Figure 6 a cross-sectional view of the structure shown;

[0031] Figure 8 yes Figure 6 An exploded view of the structure shown;

[0032] Fig. 9 It is an exploded view of the micro water pump according to the second embodiment of the present invention.

[0033] Description of the accompanying drawings:

[0034] 10. Pump housing 101. Main housing

[0035] 102, upper end cover 103, lower end cover

[0036] 104, water channel 11, accommodating chamber

[0037] 111. First cavity 112. Second cavity

[0038] 113. Third cavity 114. Sealing end cover

[0039] 1141, extended flange 1142, sealing rubber ring

[0040] 115, middle cover 1151, concave cavity

[0041] 12. Water inlet 13. Water outlet

[0042] 14. Pivot 15. Rotor seat

[0043] 16. Bearing 20. Stator

[0044] 30. Rotor 31. Shaft hole

[0045] 40. Impeller 401. First impeller

[0046] 402, second impeller 41, first connecting member

[0047] 411, connection recess 412, buckle window

[0048] 42. Upper wheel 43. Lower wheel

[0049] 44. Second connecting member 441. Fastening protrusion

[0050] 45, convex strip 46, groove

[0051] 47. Snap-fit ​​slot DETAILED DESCRIPTION

[0052] Please refer to Figures 1 to 9 As shown, it shows the specific structure of various embodiments of the present invention, which is a space-saving single-machine multi-stage micro water pump, including a pump housing 10, a stator 20, a rotor 30 and an impeller 40.

[0053] Embodiment 1:

[0054] Reference Figure 1-Figure 8 As shown, in the first embodiment of the present application, the pump housing 10 is provided with a accommodating chamber 11, a water inlet 12 and a water outlet 13, and the water inlet 12 and the water outlet 13 are both connected to the accommodating chamber 11; the stator 20 is fixedly installed in the accommodating chamber 11, and the accommodating chamber 11 is provided with a pivot 14, and the pivot 14 is located in the rotating magnetic field area of ​​the stator 20 and extends along the axial direction of the pivot 14; the rotor 30 is rotatably installed on the pivot 14, and the rotor 30 is placed in the rotating magnetic field area of ​​the stator 20, and the rotating magnetic field generated by the stator 20 drives the rotor 30 to rotate; the impeller 40 is rotatably sleeved on the pivot 14, and the impeller 40 is provided with a first connecting member 41, and the first connecting member 41 is connected to the rotor 30 as a whole. Specifically, the impeller 40 is directly connected to the rotor 30, and the impeller 40 rotates synchronously with the rotor 30. Compared with the connection method between the impeller and the rotor in the traditional water pump, the impeller 40 does not need to use a sleeve to limit the specific position between the impeller 40 and the rotor 30, nor does it need fasteners such as nuts to fix the impeller. On the one hand, the specific structure of the connection between the impeller 40 and the rotor 30 can be simplified, thereby reducing the setting of parts, occupying less internal space of the water pump, and the overall structure of the water pump can be further reduced. On the other hand, the reduction of parts can facilitate the assembly of the impeller 40 and the rotor 30, thereby improving the assembly efficiency.

[0055] Reference Figure 2-Figure 5 As shown, the pivot 14 is extended upward at the bottom of the accommodating chamber 11, and a rotor seat 15 is rotatably provided at the bottom of the pivot 14, and the rotor 30 is fixedly mounted on the rotor seat 15; bearings 16 are provided at the top and bottom of the pivot 14, and the rotor seat 15 and the impeller 40 are sleeved between the two bearings 16, and the specific position between the rotor seat 15 and the impeller 40 is limited by the bearings 16. The impeller and the rotor 30 are rotatably sleeved on the pivot 14, and the fixed pivot 14 can provide a limiting function for the rotor seat 15 and the impeller sleeve. When the rotor seat 15 and the impeller rotate, they are not easy to swing, which is conducive to further improving the stability of the impeller and the rotor 30 when they rotate.

[0056] Reference Figure 6-Figure 8As shown, the peripheral side surface of the first connecting member 41 is provided with a connecting recess 411, and the middle part of the rotor 30 is penetrated by an axial hole 31, and the connecting recess 411 is inserted into the axial hole 31 and connected to the rotor 30 as a whole. The impeller 40 is provided with more than two groups, and each group of impellers 40 is stacked along the pivot 14. The impeller 40 of the bottom group is connected to the rotor 30 through the first connecting member 41, and the impeller 40 of the upper group is assembled with the impeller 40 of the lower group through the second connecting member 44 extending from the lower end thereof. In the first embodiment of the present application, the impeller 40 includes a first impeller 401 and a second impeller 402, and the first impeller 401 and the second impeller 402 both include an upper wheel blade 42 and a lower wheel blade 43 that are connected to each other; the first connecting member 41 is arranged at the bottom of the wheel blade 43 below the first impeller 401, and the lower wheel blade 43 of the second impeller 402 is provided with a second connecting member 44, and the second connecting member 44 is connected to the lower wheel blade 43 of the first impeller 401.

[0057] Reference Figure 6-Figure 8 As shown, preferably, the impeller correspondingly provided with a first connecting member 41, that is, the first connecting member 41 arranged at the bottom of the lower wheel piece 43 of the first impeller 401, the top of which is provided with a snap-fit ​​window 412, and the lower wheel piece 43 correspondingly connected to the first connecting member 41 is provided with a snap-fit ​​through groove 47, the snap-fit ​​through groove 47 passes through the upper and lower surfaces of the lower wheel piece 43, and the snap-fit ​​through groove 47 is connected to the snap-fit ​​window 412; the impeller correspondingly provided with a second connecting member 44, that is, the second connecting member 44 arranged at the bottom of the lower wheel piece 43 of the second impeller 402, the bottom of which is provided with a snap-fit ​​protrusion 441, the second connecting member 44 passes through the upper wheel piece 42 of the first impeller 401, the snap-fit ​​through groove 47 and is snapped in the snap-fit ​​window 412 to connect the first impeller 401 and the second impeller 402. Furthermore, one of the upper wheel piece 42 and the lower wheel piece 43 is provided with a convex strip 45, and the other is provided with a groove 46, and the convex strip 45 extends up and down and abuts against the groove 46; the convex strip 45 causes the upper wheel piece 42 and the lower wheel piece 43 to be set at an upper and lower interval, and the upper wheel piece 42 is also provided with an escape window for the second connecting member 44 to pass through; when the impeller rotates, the liquid can flow from the outer surfaces of the upper wheel piece 42 and the lower wheel piece 43, and can also flow in the space set at the interval between the upper wheel piece 42 and the lower wheel piece 43 and the escape window.

[0058] Reference Figure 4 and Figure 5As shown, the pump housing 10 includes a main body housing 101, an upper end cover 102 and a lower end cover 103. In the first embodiment of the present application, the upper end cover 102 and the lower end cover 103 are installed corresponding to the top and bottom of the main body housing 101 respectively; the water inlet 12 is arranged at the lower end cover 103, and the water outlet 13 is arranged at the upper end cover 102. In more detail, the accommodating chamber 11 includes a first cavity 111, a second cavity 112 and a third cavity 113; the second cavity 112 is arranged at the periphery of the first cavity 111, and the third cavity 113 is arranged at the top of the first cavity 111; the first cavity 111 is provided with an upward opening to connect the third cavity 113. The pivot 14 is installed at the center of the first cavity 111 and extends to the third cavity 113 and abuts against the bottom of the upper end cover 102. The rotor 30 is placed in the first cavity 111, and the impeller is placed in the third cavity 113.

[0059] Reference Figure 4 and Figure 5 As shown, the second cavity 112 is provided with a downward opening and a sealing end cover 114 is installed at the opening. The second cavity 112 , the first cavity 111 and the pivot 14 are coaxially arranged, and the stator 20 is installed in the second cavity 112 . Specifically, an extended convex edge 1141 extending upward is provided at the edge of the sealing end cover 114, and the extended convex edge 1141 and the upper surface of the sealing end cover 114 constitute a waterproof recess, and a sealing rubber ring 1142 is provided between the connection between the extended convex edge 1141 and the sealing end cover 114; when the sealing end cover 114 is installed at the opening of the second cavity 112, the extended convex edge 1141 abuts against the inner side surface of the second cavity 112, the sealing end cover 114 covers the entire opening of the second cavity 112, and the sealing rubber ring 1142 also abuts against the edge of the opening of the second cavity 112; with the help of the provided sealing rubber ring 1142, it can be ensured that liquid is not easy to penetrate into the second cavity 112 from the opening of the sealing end cover 114 and the second cavity 112, so as to avoid damage to the stator 20 due to liquid penetration, and the waterproof effect is good.

[0060] The main body shell 101 is provided with a water channel 104 , which is located outside the second cavity 112 ; one end of the water channel 104 is connected to the water inlet 12 , and the other end is connected to the first cavity 111 and the third cavity 113 .

[0061] In the embodiment of the present application, the third cavity 113 is provided with a middle cover 115 to separate the third cavity 113 into two areas, and the impeller is arranged above and / or below the middle cover 115. A concave cavity 1151 is provided at the edge of the top of the middle cover 115, and the concave cavity 1151 forms a worm wheel design to achieve water flow pressurization.

[0062] Embodiment 2:

[0063] Reference Fig. 9As shown, the specific structure of the second embodiment is substantially the same as that of the first embodiment, except that the number of the middle cover 115 and the impeller combination is different;

[0064] In the second embodiment of the present application, the middle cover 115 is provided with two upper and lower intervals, that is, the third cavity 113 is divided into four areas; correspondingly, the number of impellers can be set as needed according to the added areas to obtain products with different performances, which is conducive to mass production.

[0065] The design focus of the present invention is: mainly, the impeller is directly connected to the rotor 30, and the impeller rotates synchronously with the rotor 30; compared with the connection method of the impeller and the rotor 30 in the traditional water pump, the impeller does not need to use a sleeve to limit the specific position between the impeller and the rotor 30, and does not need nuts and other fasteners to fix the impeller; on the one hand, the specific structure between the impeller and the rotor 30 can be simplified to reduce the setting of parts, occupy less space inside the water pump, and the overall structure of the water pump can be further reduced; on the other hand, the reduction of parts can facilitate the assembly of the impeller and the rotor 30, thereby improving the assembly efficiency;

[0066] At the same time, the impeller is integrally connected to the rotor 30 by the first connecting member 41; compared with the traditional way of assembling on the rotating shaft, the assembly gap between the impeller and the main shaft, and between the rotor 30 and the main shaft can be reduced; it is conducive to controlling the coaxiality requirements between the impeller and the rotor 30, ensuring the coaxiality accuracy of the impeller and the rotor 30, thereby improving the stability of the impeller and the rotor 30 during rotation, not prone to vibration, improving the stability of the water pump during operation, and also conducive to reducing the noise of the water pump during operation;

[0067] Secondly, a pivot 14 is fixedly arranged, and the impeller and the rotor 30 are rotatably mounted on the pivot 14, which is beneficial to further improve the stability of the impeller and the rotor 30 when rotating;

[0068] Furthermore, by virtue of the connection relationship between the rotor 30 and the impeller and the stacked assembly relationship of the impellers, multiple sets of impellers can be freely stacked according to actual needs to obtain products with different performances, which is conducive to mass production; for multi-impeller water pumps, more than two motors are required in traditional technology, but only one motor is needed to meet the needs in the present application, saving the motor configuration cost and the overall design space of the water pump.

[0069] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "up", "down", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0070] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A space-saving single-unit multi-stage micro water pump, comprising a pump housing, a stator, a rotor and an impeller; the pump housing is provided with a receiving cavity, a water inlet and a water outlet, the water inlet and the water outlet are both connected to the receiving cavity; the pump housing comprises a main body shell, an upper end cover and a lower end cover, the upper end cover and the lower end cover are respectively installed corresponding to the top and bottom of the main body shell; characterized in that: The accommodating cavity includes a first cavity, a second cavity and a third cavity; the second cavity is arranged at the periphery of the first cavity, and both are arranged in the main body shell; the third cavity is arranged at the top of the first cavity, the first cavity is provided with an upward opening to communicate with the third cavity, the second cavity is provided with a downward opening and a sealing end cover is installed at the opening, the edge of the sealing end cover is provided with an extended convex edge extending upward, the extended convex edge and the upper surface of the sealing end cover constitute a waterproof recess, and a sealing rubber ring is provided between the connection between the extended convex edge and the sealing end cover, when the sealing end cover is installed at the opening of the second cavity, the extended convex edge abuts against the inner side surface of the second cavity, the sealing end cover covers the entire opening of the second cavity, and the sealing rubber ring abuts against the edge of the opening of the second cavity; the main body shell is provided with a water flow channel, and the water flow channel is located on the outside of the second cavity; The stator is fixedly installed in the second cavity, the accommodating cavity is fixedly provided with a pivot, the pivot is extended upwardly from the bottom of the accommodating cavity, the pivot is installed in the center of the first cavity and extends to the third cavity, the pivot is located in the rotating magnetic field area of ​​the stator and extends along the axial direction of the pivot; the bottom of the pivot is rotatably provided with a rotor seat; the second cavity, the first cavity and the pivot are coaxially arranged; The rotor is placed in the first cavity, the rotor is rotatably mounted on the pivot, and the rotor is fixedly mounted on the rotor seat; the rotor is placed in the rotating magnetic field area of ​​the stator, and the rotating magnetic field generated by the stator drives the rotor to rotate; It also includes a middle cover arranged on the third cavity to separate the third cavity into two areas, a concave cavity is arranged at the edge of the top of the middle cover, and the concave cavity forms a turbine design to realize water flow pressurization; the middle cover is arranged between the top end of the main body shell and the bottom end of the upper end cover; The impeller is placed in the third cavity, and the impeller is rotatably mounted on the pivot. The impeller is provided with two groups, and each group of impellers is stacked along the pivot and is respectively located above and below the middle cover; each group of impellers includes an upper wheel piece and a lower wheel piece connected to each other, one of the upper wheel piece and the lower wheel piece is provided with a convex strip, and the other is provided with a groove, the convex strip extends up and down and abuts against the groove, and the upper and lower wheel pieces are set up with a spacing between the upper and lower wheel pieces due to the convex strip; a first connecting member extending downward is provided in the middle of the bottom of the lower wheel piece of the impeller of the next group, and a connecting recess is provided on the peripheral side of the first connecting member, and an axial hole passes through the middle of the rotor, and the connecting recess is inserted into the axial hole and connected to the rotor as a whole, so that the first connecting member is connected to the rotor as a whole, so that the impeller is directly connected to the rotor, and the first connecting member A snap-fit ​​window is provided at the top, and a snap-fit ​​through groove is provided at the lower wheel piece corresponding to the first connecting piece, the snap-fit ​​through groove runs through the upper and lower surfaces of the lower wheel piece, and the snap-fit ​​through groove is connected to the snap-fit ​​window; a second connecting piece extending downward is provided in the middle of the bottom of the lower wheel piece of the upper group of impellers, and a snap-fit ​​convex point is provided at the bottom of the second connecting piece; the upper wheel piece of the impeller of the lower group is also provided with an avoidance window for the second connecting piece to pass through, and the second connecting piece passes through the avoidance window of the impeller of the lower group and is snapped in the snap-fit ​​window after passing through the snap-fit ​​through groove, so that the upper group of impellers and the lower group of impellers are assembled; bearings are provided at the top and bottom of the pivot, and the rotor seat and impeller are sleeved between the two bearings, the top bearing defines the specific position of the upper group of impellers, and the bottom bearing defines the specific position of the rotor seat; The water inlet is arranged at the bottom of the lower end cover, a transversely extending water inlet channel is arranged in the lower end cover, the water outlet is arranged at the top of the upper end cover, the lower end of the water flow channel is connected to the water inlet via the water inlet channel, and the upper end of the water flow channel is connected to the first cavity and the third cavity; when the impeller rotates synchronously with the rotor, the liquid can flow from the outer surfaces of the upper wheel sheet and the lower wheel sheet, and can also flow in the space and avoidance window set between the upper wheel sheet and the lower wheel sheet.

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