CN212177440U

CN212177440U - Fluid delivery device and housing thereof

Info

Publication number: CN212177440U
Application number: CN202020731147.9U
Authority: CN
Inventors: 洪银树; 尹佐国; 李明聪
Original assignee: Sunonwealth Electric Machine Industry Co Ltd
Current assignee: Sunonwealth Electric Machine Industry Co Ltd
Priority date: 2020-02-07
Filing date: 2020-05-07
Publication date: 2020-12-18
Anticipated expiration: 2030-05-07
Also published as: TW202130910A; TWI786371B; CN113250967A

Abstract

The utility model discloses a fluid conveying device and shell thereof, this fluid conveying device includes: a housing and a fluid driving member. The shell is provided with a first shell, a second shell and a plurality of limiting parts. The first shell and the second shell are oppositely combined in a relative joint direction, and the plurality of limiting pieces are respectively clamped on the periphery of the first shell and the second shell after being oppositely combined. The fluid driving member has a motor and at least one impeller, the motor and the at least one impeller are disposed in the first casing and the second casing, and the motor is used for driving the at least one impeller to rotate. Therefore, the utility model discloses fluid conveying device can promote the equipment convenience, and can promote the product yield. And moreover, the sealing and waterproof effects of the shell can be improved.

Description

Fluid delivery device and housing thereof

Technical Field

The utility model relates to a fluid conveying device and shell thereof.

Background

The existing fluid conveying device is commonly used as a water pump and the like, and mainly can control the fluid circulation motion such as cooling water and the like so as to radiate various products on the market which are easy to generate high temperature during operation.

Further, the components of the conventional water pump include many components with complicated structures, such as a housing, a motor, a shaft core, a water vane, a shaft seal, and a hub, which causes inconvenience in assembly and maintenance of the water pump. In addition, a better sealing and waterproof effect may be only provided at the screw fastening portion, which may cause a problem of water leakage at other non-screw fastening portions, and thus, there is still a need for improvement.

SUMMERY OF THE UTILITY MODEL

The utility model provides a fluid conveying device. In one embodiment, the fluid delivery device comprises: a housing and a fluid driving member. The shell is provided with a first shell, a second shell and a plurality of limiting parts. The first shell and the second shell are oppositely combined in a relative joint direction, and the plurality of limiting pieces are respectively clamped on the peripheries of the oppositely combined first shell and the second shell. The fluid driving member has a motor and at least one impeller, the motor and the at least one impeller are disposed in the first casing and the second casing, and the motor is used for driving the at least one impeller to rotate.

The fluid conveying device as described above, wherein the first housing has a first extending portion disposed at a periphery of the first housing, the second housing has a second extending portion disposed at a periphery of the second housing, and the plurality of limiting members respectively clamp the first extending portion and the second extending portion which are already closed.

The fluid conveying device as described above, wherein the first extending portion includes a plurality of arc-shaped sections and a plurality of straight sections, and the second extending portion includes a plurality of arc-shaped sections and a plurality of straight sections.

The fluid conveying device as described above, wherein the plurality of limiting members include two limiting members, each limiting member includes two arc portions and a straight portion, the two arc portions of each limiting member correspondingly clamp the arc-shaped sections of the first extension portion and the second extension portion that are already closed, and the straight portion of each limiting member correspondingly clamps the straight sections of the first extension portion and the second extension portion that are already closed.

The fluid conveying device as described above, wherein the plurality of limiting members include two limiting members, each limiting member includes a straight portion, and the straight portion of each limiting member correspondingly clamps the straight section of the first extension portion and the straight section of the second extension portion that are already closed.

The fluid conveying device as described above, wherein the plurality of limiting members includes four limiting members, each of the limiting members includes an arc portion, and the arc portion correspondingly clamps the arc-shaped section of the first extending portion and the arc-shaped section of the second extending portion that are already closed.

The fluid conveying device as described above, wherein the plurality of straight sections of the first extension portion includes a plurality of first straight sections and a plurality of second straight sections, a length of the first straight section of the first extension portion is greater than a length of the second straight section, the plurality of straight sections of the second extension portion includes a plurality of third straight sections and a plurality of fourth straight sections, and a length of the third straight section of the second extension portion is greater than a length of the fourth straight section.

The fluid conveying device as described above, wherein the plurality of limiting members include two limiting members, each limiting member includes two arc portions and a straight portion, the two arc portions of each limiting member correspondingly clamp the arc-shaped sections of the first extension portion and the second extension portion that are already aligned, and the straight portion of each limiting member correspondingly clamps the second straight section of the first extension portion and the fourth straight section of the second extension portion that are already aligned.

The fluid conveying device as described above, wherein a sealing ring is disposed between the first extending portion of the first housing and the second extending portion of the second housing.

The fluid transfer device as described above, wherein the sealing ring is a waterproof rubber sealing ring or a waterproof silicone sealing ring.

The fluid delivery device according to the above, wherein at least one of the first extending portion and the second extending portion includes a positioning protrusion, and at least one of the limiting members includes a positioning recess, and the positioning recess is disposed at a corresponding position of the positioning protrusion to accommodate the positioning protrusion.

The fluid delivery device as described above, wherein the first extension portion or the second extension portion has a perimeter length, the restriction members have a total length, the total length is a sum of individual lengths of the restriction members, and the total length is 70% or more than 70% of the perimeter length.

The fluid delivery device as described above, wherein the housing includes a receiving space for receiving the at least one impeller and the motor.

The fluid delivery device as described above, wherein the at least one impeller comprises a first impeller and a second impeller, and the first impeller is connected to the second impeller.

The fluid conveying device as described above, wherein the accommodating space is provided with a first accommodating chamber, a second accommodating chamber and a third accommodating chamber, the second accommodating chamber is located between the first accommodating chamber and the third accommodating chamber in an axial direction perpendicular to the relative joint direction, the first impeller is disposed in the first accommodating chamber, the second impeller is disposed in the second accommodating chamber, and the motor is disposed in the third accommodating chamber.

The fluid conveying device as described above, wherein the third chamber is provided with at least one first positioning portion, the motor is provided with at least one second positioning portion, and the first positioning portion and the second positioning portion are positioned correspondingly to each other.

In the fluid delivery device, the first positioning portion and the second positioning portion are respectively a plane that abuts against each other.

The fluid conveying device as described above, wherein the housing is provided with a first conveying portion and a second conveying portion, the first conveying portion and the second conveying portion are communicated with the accommodating space, the first conveying portion is correspondingly communicated with the first accommodating chamber, the second conveying portion is correspondingly communicated with the second accommodating chamber, and the first conveying portion and the second conveying portion are disposed in the first housing.

The fluid conveying device as described above, wherein each of the restricting members includes a receiving portion for receiving the first extending portion and the second extending portion that are coupled.

The fluid transporting device as described above, wherein each of the restricting members is of a reverse-U shape, each of the restricting members includes a first side portion, a second side portion and a third side portion, the first side portion and the second side portion are corresponding, and the third side portion is connected to the first side portion and the second side portion.

The fluid delivery device as described above, wherein the first impeller of the fluid driving member has a plurality of grooves on an upper surface thereof in an axial direction, and the second impeller of the fluid driving member has a plurality of grooves on an upper surface thereof in the axial direction.

The fluid conveying device as described above, wherein the plurality of grooves are formed by a plurality of herringbone grooves, and the herringbone grooves are circumferentially arranged around the upper surface of the first impeller or the upper surface of the second impeller.

The fluid conveying device as described above, wherein the plurality of grooves are formed by a plurality of herringbone grooves and an annular groove, the annular groove is disposed on the upper surface of the first impeller or the upper surface of the second impeller, and the herringbone grooves are overlapped with the annular groove at intervals to be disposed on the upper surface of the first impeller or the upper surface of the second impeller in a circumferential arrangement.

The fluid conveying device as described above, wherein the plurality of grooves are formed by a plurality of arc-shaped grooves, and the plurality of arc-shaped grooves are respectively circumferentially arranged and circumferentially disposed on the upper surface of the first impeller or the upper surface of the second impeller.

The fluid conveying device as described above, wherein a plurality of grooves are disposed on a first inner wall of the first casing and a first inner wall of the second casing above an axial upper surface of the first impeller, and a plurality of grooves are disposed on a second inner wall of the first casing and a second inner wall of the second casing above the axial upper surface of the second impeller.

The fluid conveying device as described above, wherein the plurality of grooves are formed by a plurality of herringbone grooves, and the herringbone grooves are respectively annularly arranged and annularly arranged around the first inner wall or the second inner wall.

The fluid conveying device as described above, wherein the plurality of grooves are formed by a plurality of herringbone grooves and an annular groove, the annular groove is disposed on the first inner wall or the second inner wall, and the herringbone grooves are overlapped with the annular groove at intervals, so as to be disposed around the first inner wall or the second inner wall in an annular arrangement.

The fluid conveying device as described above, wherein the plurality of grooves are formed by a plurality of arc-shaped grooves, and the plurality of arc-shaped grooves are respectively annularly arranged and annularly arranged around the first inner wall or the second inner wall.

The fluid delivery device as described above, wherein the motor has a central shaft, a permanent magnet and a stator, the central shaft penetrates through the first impeller, the second impeller and the stator in an axial direction, two opposite ends of the central shaft are fixed in the accommodating space, and the permanent magnet is combined with the second impeller.

The fluid conveying device as described above, wherein at least one bearing is disposed between the central shaft and the first and second impellers.

The fluid conveying device as described above, wherein a gap is formed between the motor and the inner peripheral wall of the housing, a gap is respectively formed between the first impeller and the inner peripheral wall of the housing, a gap is formed between the at least one bearing and the central shaft, and a plurality of gaps jointly form a flow channel for the fluid to flow circularly.

The fluid delivery device according to the above, wherein the at least one bearing has a plurality of axial grooves formed in the axial direction.

The fluid delivery device according to the above, wherein the inner wall of the at least one bearing has a plurality of inner grooves.

The fluid transfer device as described above, wherein the plurality of inner grooves comprise: a plurality of herringbone inner grooves, a plurality of herringbone inner grooves and an annular inner groove, or a plurality of arc inner grooves.

The utility model provides a shell for fluid conveying device. In one embodiment, the housing for a fluid delivery device comprises: a first shell, a second shell and a plurality of restricting parts. The first shell has a periphery. The second shell has a periphery, and the first shell and the second shell are involuted in a relative joint direction. The limiting pieces are respectively clamped on the peripheries of the first shell and the second shell after being combined.

The casing for a fluid conveying device as described above, wherein the first casing has a first extending portion disposed at a periphery of the first casing, the second casing has a second extending portion disposed at a periphery of the second casing, and the plurality of limiting members respectively clamp the first extending portion and the second extending portion which are closed.

The housing for a fluid conveying device as described above, wherein the first extending portion includes a plurality of arc-shaped sections and a plurality of straight sections, and the second extending portion includes a plurality of arc-shaped sections and a plurality of straight sections.

The casing for the fluid conveying device as described above, wherein the plurality of limiting members include two limiting members, each limiting member includes two arc portions and a straight portion, the two arc portions of each limiting member clamp the arc-shaped sections of the first extension portion and the second extension portion that are already aligned, and the straight portion of each limiting member clamps the straight sections of the first extension portion and the second extension portion that are already aligned.

The casing for the fluid conveying device as described above, wherein the plurality of limiting members include two limiting members, each of the limiting members includes a straight portion, and the straight portion of the first extending portion and the straight portion of the second extending portion that are aligned are correspondingly clamped.

The casing for the fluid conveying device as described above, wherein the plurality of limiting members include four limiting members, each limiting member includes an arc portion, and the arc portions clamp the aligned arc sections of the first extending portion and the second extending portion correspondingly.

The housing for a fluid conveying device as described above, wherein the plurality of straight sections of the first extending portion includes a plurality of first straight sections and a plurality of second straight sections, a length of the first straight section of the first extending portion is greater than a length of the second straight section, the plurality of straight sections of the second extending portion includes a plurality of third straight sections and a plurality of fourth straight sections, and a length of the third straight section of the second extending portion is greater than a length of the fourth straight section.

The casing for the fluid conveying device as described above, wherein the plurality of limiting members include two limiting members, each limiting member includes two arcs and a straight portion, the two arcs of each limiting member clamp the arc-shaped sections of the first extension portion and the second extension portion that are already aligned, and the straight portion of each limiting member clamps the second straight section of the first extension portion and the fourth straight section of the second extension portion that are already aligned.

The casing for a fluid conveying device as described above, wherein a sealing ring is disposed between the first extension portion of the first casing and the second extension portion of the second casing.

The housing for a fluid transfer device as described above, wherein the sealing ring is a waterproof rubber sealing ring or a waterproof silicone sealing ring.

The casing for the fluid conveying device as described above, wherein the casing is provided with a first conveying portion and a second conveying portion, and the first conveying portion and the second conveying portion are respectively disposed on the first casing.

The casing for the fluid delivery device as described above, wherein at least one of the first extension portion and the second extension portion includes a positioning protrusion, and at least one of the limiting members includes a positioning recess, and the positioning recess is disposed at a corresponding position of the positioning protrusion to accommodate the positioning protrusion.

The housing for a fluid conveying device as described above, wherein the first extension portion or the second extension portion has a peripheral length, the restriction members have a total length, the total length is a sum of individual lengths of the restriction members, and the total length is 70% or more than 70% of the peripheral length.

The casing for the fluid conveying device as described above, wherein each of the restricting members includes a receiving portion for receiving the first extending portion and the second extending portion that are aligned.

The casing for a fluid conveying device as described above, wherein each of the limiting members is n-shaped, each of the limiting members includes a first side portion, a second side portion and a third side portion, the first side portion corresponds to the second side portion, and the third side portion connects the first side portion and the second side portion. The utility model discloses fluid conveying device utilizes these a plurality of restrictions, and the clamp fits the periphery after this first casing and this second casing are to closing to the equipment this first casing and this second casing can promote the equipment convenience, and can not cause the cracked problem of this first casing or this second casing because of the application of force is improper, in order to promote the product yield. Moreover, the plurality of limiting pieces can improve the sealing and waterproof effects of the shell.

Drawings

The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for helping the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. The skilled person in the art can, under the teaching of the present invention, choose various possible shapes and proportional dimensions to implement the invention according to the specific situation.

Fig. 1 is a perspective view of a fluid transfer device according to an embodiment of the present invention;

fig. 2A is an exploded perspective view of a fluid delivery device according to an embodiment of the present invention;

fig. 2B is a schematic front view of a second housing of a fluid transfer device according to an embodiment of the present invention;

fig. 3 is an exploded perspective view of a restriction member of a fluid transfer device according to an embodiment of the present invention, separated from a first housing and a second housing that are closed together;

fig. 4 is an exploded perspective view of a restriction member of a fluid transfer device according to an embodiment of the present invention, separated from a first housing and a second housing that are closed together;

fig. 5 is an exploded perspective view of a restriction member of a fluid transfer device according to an embodiment of the present invention, separated from the first and second housings;

fig. 6 is an exploded perspective view of a restriction member of a fluid transfer device according to an embodiment of the present invention, separated from a first housing and a second housing;

fig. 7 is a top view of a first embodiment of a first impeller or a second impeller of a fluid delivery device according to an embodiment of the present invention;

fig. 8 is a top view of a second embodiment of a first impeller or a second impeller of a fluid delivery device according to an embodiment of the present invention;

fig. 9 is a top view of a third embodiment of a first impeller or a second impeller of a fluid delivery device according to an embodiment of the present invention;

FIG. 10 illustrates a combined cross-sectional view of a restriction member of an embodiment of the present invention in a disengaged configuration; and

fig. 11 is a perspective view of a first bearing or a second bearing of a fluid conveying device according to an embodiment of the present invention.

Description of the reference numerals

Fluid delivery device

10: outer casing

11: first housing

12: second housing

13,14 limiting piece

15, a containing space

16: a first conveying part

17 second conveying part

18: sealing ring

Fluid driving member

21 the first impeller

211 upper surface

212 groove

212a herringbone grooves

212b annular groove

212c arc groove

22 second impeller

221 upper surface

222 groove

222a herringbone grooves

222b annular groove

222c arc groove

23: motor

231 central axis

232 permanent magnet

233 stator

24 first bearing

241 axial groove

25 second bearing

251 axial groove

33,34 limiting piece

43,44 limiting member

51,52,53,54 limiting piece

110 the periphery of the first housing

111 first extension part

112,113,114,115 arc-shaped section

116,117 straight section (first straight section)

118,119 straight section (second straight section)

120 the periphery of the second housing

121: second extension part

122,123,124,125 arc-shaped section

126,127 straight section (third straight section)

128,129 straight section (fourth straight section)

131,132 arc part

133 straight part

134 accommodating part

141,142 arc part

143 straight part

144 accommodating part

151 first chamber

152 the second chamber

153 the third chamber

191 first inner wall

192 second inner wall

333 straight part

334 first side part

335 second side part

336 third side part

337 accommodating part

343 straight part

431,432 arc portion

433 straight part

441,442 arc part

443 straight part

511,521,531,541 arc part

Relative joining direction

F1 first positioning part

F2 second positioning part

P is a positioning salient point

S is a positioning groove

X is axial direction

Detailed Description

The details of the present invention can be more clearly understood with reference to the accompanying drawings and the description of the embodiments of the present invention. However, the specific embodiments of the present invention described herein are for the purpose of explanation only, and should not be construed as limiting the invention in any way. Given the teachings of the present invention, the skilled person can conceive of any possible variants based on the invention, which should all be considered as belonging to the scope of the invention.

Fig. 1 is a perspective view of a fluid transfer device according to an embodiment of the present invention. Fig. 2A is an exploded perspective view of a fluid delivery device according to an embodiment of the present invention. Fig. 2B is a schematic front view of a second housing of a fluid delivery device according to an embodiment of the present invention. Referring to fig. 1, fig. 2A and fig. 2B, the fluid delivery device 1 of the present invention includes a housing 10 and a fluid driving member 20. The fluid delivery device 1 of the present invention can be used to drive the fluid such as liquid (e.g. water or non-conductive liquid) or gas to flow circularly, for example: the fluid delivery device 1 of the present invention can be applied to a water pump, but is not limited thereto.

In one embodiment, the housing 10 of the fluid delivery device 1 of the present invention has a first housing 11, a second housing 12 and a plurality of restricting

members

13, 14. The first housing 11 has a periphery 110. The second housing 12 has a periphery 120, the first housing 11 and the second housing 12 are aligned in a relative joint direction D, and the first housing 11 and the second housing 12 are split along an axial direction X. The limiting

members

13 and 14 are respectively clamped at the periphery of the first casing 11 and the second casing 12 after being combined, that is, after the first casing 11 and the second casing 12 are combined, the limiting

members

13 and 14 are respectively clamped at the periphery of the first casing 11 and the second casing 12 after being combined. In an embodiment, the plurality of limiting

members

13 and 14 are tightly fitted and clamped on the combined peripheries of the first casing 11 and the second casing 12, respectively.

In one embodiment, the first housing 11 has a first extension 111 disposed on the periphery 110 of the first housing 11, and the second housing 12 has a second extension 121 disposed on the periphery 120 of the second housing. In one embodiment, the first extension 111 and the second extension 121 can be respectively disposed around the first housing 11 and the second housing 12. In an embodiment, the first extending portion 111 and the second extending portion 121 may be annularly disposed on the periphery of the first casing 11 and the second casing 12, respectively, or the first extending portion 111 and the second extending portion 121 may be discontinuously disposed on the periphery of the first casing 11 and the second casing 12, respectively. The limiting

members

13 and 14 respectively clamp the first extension portion 111 and the second extension portion 121 which are already aligned. In one embodiment, the limiting

members

13 and 14 are tightly fitted with the first extending portion 111 and the second extending portion 121.

In one embodiment, the first extending portion 111 includes a plurality of arc-shaped sections 112,113,114,115 and a plurality of straight sections 116,117, 118,119, and the plurality of arc-shaped sections 112,113,114,115 and the plurality of straight sections 116,117, 118,119 are disposed at intervals. The second extending portion 121 includes a plurality of arc-shaped sections 122,123,124,125 and a plurality of straight sections 126,127, 128,129, and the plurality of arc-shaped sections 122,123,124,125 and the plurality of straight sections 126,127, 128,129 are disposed at intervals.

In an embodiment, the limiting members include two limiting members 13 and 14 (the housing 10 includes two limiting members 13 and 14), the limiting member 13 includes two

arc portions

131 and 132 and a straight portion 133, wherein the two

arc portions

131 and 132 of the limiting member 13 correspondingly clamp the

arc sections

112 and 113 of the first extension portion 111 and the

arc sections

122 and 123 of the second extension portion 121, and the straight portion 133 of the limiting member 13 correspondingly clamps the straight section 116 of the first extension portion 111 and the straight section 126 of the second extension portion 121. The limiting member 14 includes two arc portions 141,142 and a straight portion 143, wherein the two arc portions 141,142 of the limiting member 14 correspondingly clamp the aligned arc sections 114,115 of the first extending portion 111 and the arc sections 124,125 of the second extending portion 121, and the straight portion 143 of the limiting member 14 correspondingly clamps the aligned straight section 117 of the first extending portion 111 and the straight section 127 of the second extending portion 121. In one embodiment, the limiting

members

13 and 14 are tightly fitted to the corresponding sections of the first extending portion 111 and the second extending portion 121 respectively.

In one embodiment, a sealing ring 18 is disposed between the first extension 111 and the second extension 121 of the first housing 11 and the second housing 12. The sealing ring 18 is waterproof rubber or waterproof silicone. The sealing ring 18 can provide a better sealing effect after the first housing 11 and the second housing 12 are mated, so as to prevent the liquid or gas in the fluid conveying device 1 from leaking.

In an embodiment, because the sealing ring 18 has elasticity, when the plurality of restricting

members

13 and 14 are assembled, an assembler can apply force to press the first housing 11 and the second housing 12 first, so that the sealing ring 18 is pressed to reduce the thickness, and the total thickness of the first housing 11, the sealing ring 18 and the second housing 12 after being combined is reduced, so that the plurality of restricting

members

13 and 14 are respectively sleeved on the section of the first extending portion 111 and the section of the second extending portion 121. Moreover, after the plurality of restricting

members

13 and 14 are respectively sleeved, the force applied by the assembler is eliminated, the sealing ring 18 is not pressed and the thickness is recovered, so that the tight fit between the plurality of restricting

members

13 and 14 and the sections of the first extending portion 111 and the second extending portion 121 is improved, and the sealing and waterproof effects of the housing 10 are improved.

In an embodiment, at least one of the first extension portion 111 and the second extension portion 121 further includes a positioning protrusion P, and at least one of the limiting

members

13 and 14 further includes a positioning recess S disposed at a corresponding position of the positioning protrusion P to accommodate the positioning protrusion P. In an embodiment, the positioning bump P is disposed on the straight section 126 of the second extending portion 121, and the positioning groove S is disposed on the straight portion 133 of the limiting member 13 corresponding to the corresponding position of the positioning bump P to accommodate the positioning bump P, so as to provide a better positioning effect and further prevent the limiting member 13 from falling off.

In one embodiment, the first extension portion 111 or the second extension portion 121 has a peripheral length, and the limiting

members

13 and 14 have a total length which is the sum of the respective lengths of the limiting

members

13 and 14, such as: the individual length of the limiting member 13 is the sum of the lengths of the two

arc portions

131 and 132 and the length of the straight portion 133, and the total length is 70% or more than 70% of the length of the periphery. Therefore, the plurality of limiting

members

13 and 14 can clamp most sections of the first extending portion 111 and the second extending portion 121, so as to improve the sealing and waterproof effects.

In an embodiment, each of the restricting members includes a receiving portion for receiving the first extending portion and the second extending portion which are coupled together. The limiting member 13 includes a receiving portion 134 having a receiving space for receiving the first extending portion 111 and the second extending portion 121 which are coupled together. The limiting member 14 includes a receiving portion 144 for receiving the first extending portion 111 and the second extending portion 121 which are coupled together.

In one embodiment, the fluid driving member 20 has a motor 23 and at least one

fan

21, 22, the motor 23 and the at least one

fan

21, 22 are disposed in the first housing 11 and the second housing 12, and the motor 23 is used to drive the at least one

fan

21, 22 to rotate. In one embodiment, the housing 10 further includes a receiving space 15 for receiving the at least one

impeller

21, 22 and the motor 23. In one embodiment, the at least one

impeller

21, 22 includes a first impeller 21 and a second impeller 22 (the fluid driving member 20 includes a first impeller 21 and a second impeller 22), and the first impeller 21 and the second impeller 22 are connected.

In one embodiment, the accommodating space 15 has a first accommodating chamber 151, a second accommodating chamber 152 and a third accommodating chamber 153, the second accommodating chamber 152 is located between the first accommodating chamber 151 and the third accommodating chamber 153 in the axial direction X perpendicular to the relative joint direction D, the first impeller 21 is disposed in the first accommodating chamber 151, the second impeller 22 is disposed in the second accommodating chamber 152, and the motor 23 is disposed in the third accommodating chamber 153. Therefore, the first chamber 151, the second chamber 152 and the third chamber 153 can effectively separate the first impeller 21, the second impeller 22 and the motor 23 respectively.

The number of the fan wheels of the fluid conveying device 1 of the present invention can be set to more than two, and the chamber can be set to more than three corresponding to the number of the fan wheels. For example, when the number of the fan wheels is three, the number of the chambers can be four; when the number of the fan wheels is four, the number of the chambers can be five, and the like. Thereby, the fluid output pressure is increased.

In one embodiment, the housing 10 has a peripheral wall in the third accommodating chamber 153, the peripheral wall is provided with at least one first positioning portion F1, the motor 23 is provided with at least one second positioning portion F2, and the first positioning portion F1 and the second positioning portion F2 are positioned correspondingly to each other. In an embodiment, the first positioning portion F1 and the second positioning portion F2 are respectively a plane abutting against each other. Therefore, the first positioning portion F1 and the second positioning portion F2 can be attached to each other more tightly, so as to provide a better anti-rotation positioning function for the motor 23.

In one embodiment, the housing 10 is provided with a first conveying portion 16 and a second conveying portion 17, the first conveying portion 16 and the second conveying portion 17 are communicated with the accommodating space 15, the first conveying portion 16 is correspondingly communicated with the first accommodating chamber 151, the second conveying portion 17 is correspondingly communicated with the second accommodating chamber 152, the first conveying portion 16 and the second conveying portion 17 are respectively tubes for being assembled and disassembled on the housing 10, and the first conveying portion 16 and the second conveying portion 17 are arranged on the first housing 11.

In practical use of the fluid transport device 1 of the present invention, when the first transport portion 16 is set as the input end of the fluid, the second transport portion 17 can be set as the output end of the fluid; alternatively, when the first delivery part 16 is set as the output end of the fluid, the second delivery part 17 may be set as the input end of the fluid, thereby improving the convenience of use. Further, the motor 23 can synchronously drive the first fan 21 and the second fan 22 to rotate in a predetermined direction (e.g., clockwise or counterclockwise), so as to more effectively drive and pressurize the fluid flow, thereby improving the fluid delivery efficiency.

In an embodiment, the first impeller 21, the second impeller 22 and the motor 23 of the fluid driving member 20 can be assembled into a whole and then directly placed into the receiving space 15, and by using the design of the first housing 11 and the second housing 12 split along the axial direction X, the first housing 11 and the second housing 12 can be mutually abutted and the plurality of limiting

members

13,14 are clamped on the abutted peripheries of the first housing 11 and the second housing 12 based on the relative engagement direction D (perpendicular to the axial direction X), so that the fluid driving member 20 integrally designed after being assembled is hermetically wrapped in the receiving space 15 of the housing 10, which can provide better convenience for assembly and disassembly, and the fluid driving member 20 can be further integrally placed into the housing 10 or taken out of the housing 10 in a whole to facilitate maintenance operation.

In one embodiment, the first housing 11 and the second housing 12 of the fluid conveying device 1 may be made of the same material; therefore, when the same material is adopted, the first shell 11 and the second shell 12 are easy to produce and manufacture, and the cost can be effectively reduced. Alternatively, the first housing 11 and the second housing 12 may be made of different materials, in an embodiment, the first housing 11 is made of a transparent material such as: a transparent shell made of acryl, Polycarbonate (PC) or polyvinyl chloride (PVC), a translucent shell made of acryl, PC or PVC, and the second shell 12 is made of a heat conductive material (such as a metal material), but not limited to the above, and other suitable materials can be selected; therefore, the accommodating space 15 of the housing 10 can be provided with a temperature sensing element (not shown) and a light emitting element (not shown), the light emitting element corresponds to the first casing 11, the temperature sensing element is electrically coupled to a control element (not shown) to control the light emitting element, the temperature sensing element can be used for detecting the operating temperature of the motor 23 or the temperature of the fluid in the accommodating space 15 by utilizing the perspective function of the first casing 11, and when the temperature exceeds a default value, the control element can be used for controlling the light emitting element to emit a warning light (such as a red light) with a specific color to remind a user of attention, thereby achieving a better warning control function. In an embodiment, the utility model discloses fluid conveying device 1 has a plurality of light-emitting component, the utility model discloses fluid conveying device 1 is when the function, and these a plurality of light-emitting component can send the light of different colours to promote pleasing to the eye and have the cool effect of dazzling.

In one embodiment, when the first conveying part 16 is set as the input end of the fluid and the second conveying part 17 is set as the output end of the fluid, when the motor 23 synchronously drives the first impeller 21 and the second impeller 22 to rotate, the first impeller 21 and the second impeller 22 can cooperate with each other to guide the fluid from the first conveying part 16 into the fluid to sequentially pass through the first chamber 151 and the second chamber 152, and then guide the fluid out from the second conveying part 17, so as to achieve the purpose of circularly conveying the fluid.

Fig. 3 is an exploded perspective view of the restriction member of the fluid transfer device according to an embodiment of the present invention, separated from the first housing and the second housing. Referring to fig. 2A, 2B and 3, in an embodiment, the limiting members include two limiting

members

33 and 34, and the limiting member 33 includes a straight portion 333 corresponding to the straight portion 117 of the first extension portion 111 and the straight portion 127 of the second extension portion 121. The limiting member 34 includes a straight portion 343, which is used to clamp the straight section 116 of the first extension 111 and the straight section 126 of the second extension 121. In one embodiment, the limiting member 33 is of a reverse-U shape (concave shape with a downward opening), the limiting member 33 includes a first side portion 334, a second side portion 335 and a third side portion 336, the first side portion 334 and the second side portion 335 are corresponding, and the third side portion 336 connects the first side portion 334 and the second side portion 335. Therefore, the first side portion 334, the second side portion 335 and the third side portion 336 form a receiving portion 337 for receiving the straight section 117 of the first extension portion 111 and the straight section 127 of the second extension portion 121 which are aligned. In one embodiment, the restricting

members

33 and 34 are tightly fitted to the sections of the first extension 111 and the second extension 121.

Fig. 4 is an exploded perspective view of the restriction member of the fluid transfer device according to an embodiment of the present invention, separated from the first housing and the second housing. Referring to fig. 2A, 2B and 4, in an embodiment, the plurality of straight sections 116,117, 118 and 119 of the first extension portion 111 includes a plurality of first straight sections 116,117 and a plurality of second

straight sections

118 and 119, the length of the first

straight sections

116 and 117 of the first extension portion 111 is greater than the length of the second

straight sections

118 and 119, the plurality of straight sections 126,127, 128 and 129 of the second extension portion 121 includes a plurality of third

straight sections

126 and 127 and a plurality of fourth

straight sections

128 and 129, and the length of the third

straight sections

126 and 127 of the second extension portion 121 is greater than the length of the fourth

straight sections

128 and 129. In an embodiment, the limiting members include two limiting

members

43 and 44, the limiting member 43 includes two

arc portions

431 and 432 and a straight portion 433, wherein the two

arc portions

431 and 432 of the limiting member 43 correspondingly clamp the

arc sections

112 and 115 of the first extension portion 111 and the

arc sections

122 and 125 of the second extension portion 121, and the straight portion 433 of the limiting member 43 correspondingly clamps the second straight section 118 of the first extension portion 111 and the fourth straight section 128 of the second extension portion 121. The limiting member 44 includes two arc portions 441,442 and a straight portion 443, wherein the two arc portions 441,442 of the limiting member 44 correspondingly clamp the aligned arc sections 113,114 of the first extending portion 111 and the arc sections 123,124 of the second extending portion 121, and the straight portion 443 of the limiting member 44 correspondingly clamps the aligned second straight section 119 of the first extending portion 111 and the fourth straight section 129 of the second extending portion 121. In one embodiment, the restricting

members

43 and 44 are tightly fitted with the sections of the first extension 111 and the second extension 121.

Fig. 5 is an exploded perspective view of the restriction member of the fluid transfer device according to an embodiment of the present invention, separated from the first housing and the second housing. Referring to fig. 2A, 2B and 5, the limiting members include four limiting

members

51,52,53 and 54, the limiting member 51 includes an arc portion 511, which correspondingly clamps the arc section 115 of the first extension portion 111 and the arc section 125 of the second extension portion 121; the limiting member 52 includes an arc portion 521, which correspondingly clamps the arc section 114 of the first extension 111 and the arc section 124 of the second extension 121; the limiting member 53 includes an arc portion 531 for correspondingly clamping the arc section 112 of the first extension 111 and the arc section 122 of the second extension 121; the limiting component 54 includes an arc portion 541, which is used to clamp the arc section 113 of the first extension 111 and the arc section 123 of the second extension 121. In one embodiment, the restricting

members

51,52,53,54 are tightly fitted and clamped with the sections of the first extension 111 and the second extension 121, respectively.

Fig. 6 is an exploded perspective view of a restriction member of a fluid transfer device according to an embodiment of the present invention, separated from a first housing and a second housing. Referring to fig. 6, in an embodiment, a plurality of grooves 212 may be disposed on an upper surface 211 of the first impeller 21 of the fluid driving member 20 relative to the axial direction X, and a plurality of grooves 222 may be disposed on an upper surface 221 of the second impeller 22 of the fluid driving member 20 relative to the axial direction X. Therefore, when the motor 23 drives and pressurizes the fluid to flow in the first accommodation chamber 151 and the second accommodation chamber 152 by using the first impeller 21 and the second impeller 22, the fluid can enter the plurality of

grooves

212 and 222 at the same time, and a stable pressing action of the first impeller 21 and the second impeller 22 in the axial direction X can be provided by means of dynamic pressure of the fluid in the flowing process, so that a safety gap can be kept between the upper surface 211 of the first impeller 21 and the upper surface 221 of the second impeller 22 and the inner walls of the first casing 11 and the second casing 12 in the rotating process of the first impeller 21 and the second impeller 22, so as to avoid abrasion caused by friction or collision with the first casing 11 and the second casing 12, and further prolong the service life of the fluid conveying device 1.

Fig. 7 is a top view of a first embodiment of a first impeller or a second impeller of a fluid delivery device according to an embodiment of the present invention. Fig. 8 is a top view of a second embodiment of a first impeller or a second impeller of a fluid delivery device according to an embodiment of the present invention. Fig. 9 is a top view of a third embodiment of a first impeller or a second impeller of a fluid delivery device according to an embodiment of the present invention. Referring to fig. 7, in the first embodiment, the plurality of

grooves

212 and 222 may be formed by a plurality of

herringbone grooves

212a and 222a, and the plurality of

herringbone grooves

212a and 222a may be respectively disposed around the upper surface 211 of the first impeller 21 or the upper surface 221 of the second impeller 22 in a circumferential arrangement. Referring to fig. 8, in the second embodiment, the plurality of

grooves

212 and 222 may be formed by a plurality of

herringbone grooves

212a and 222a and an

annular groove

212b and 222b, the

annular groove

212b and 222b is respectively disposed on the upper surface 211 of the first impeller 21 or the upper surface 221 of the second impeller 22, and the plurality of

herringbone grooves

212a and 222a may be alternately overlapped with the

annular groove

212b and 222b to be respectively disposed on the upper surface 211 of the first impeller 21 or the upper surface 221 of the second impeller 22 in a circumferential arrangement. Referring to fig. 9, in the third embodiment, the plurality of

grooves

212 and 222 may be formed by a plurality of arc-shaped

grooves

212c and 222c, and the plurality of arc-shaped

grooves

212c and 222c are respectively circumferentially arranged and circumferentially disposed on the upper surface 211 of the first impeller 21 or the upper surface 221 of the second impeller 22. Therefore, as mentioned above, the first impeller 21 and the second impeller 22 are effectively prevented from colliding with the first casing 11 and the second casing 12 during the rotation process.

Referring to fig. 6, in an embodiment, a plurality of grooves (not shown) are disposed on a first inner wall 191 of the first casing 11 and the second casing 12 above the upper surface 211 of the first impeller 21 in the axial direction X, and a plurality of grooves (not shown) are disposed on a second inner wall 192 of the first casing 11 and the second casing 12 above the upper surface 221 of the second impeller 22 in the axial direction X. Referring to fig. 7, the relative shapes of the

grooves

212 and 222 can be disposed on the first inner wall 191 or the second inner wall 192, that is, the grooves are formed by a plurality of herringbone grooves respectively disposed in a ring-shaped arrangement around the first inner wall or the second inner wall. Referring to fig. 8, the relative shapes of the

grooves

212 and 222 can be disposed on the first inner wall 191 or the second inner wall 192, that is, the grooves are formed by a plurality of herringbone grooves and an annular groove, the annular groove is disposed on the first inner wall or the second inner wall respectively, and the herringbone grooves are overlapped with the annular groove at intervals for being disposed around the first inner wall or the second inner wall respectively in an annular arrangement. Referring to fig. 9, the relative shapes of the plurality of

grooves

212 and 222 may be disposed on the first inner wall 191 or the second inner wall 192, that is, the plurality of grooves are formed by a plurality of arc-shaped grooves respectively disposed in an annular arrangement around the first inner wall or the second inner wall.

Therefore, as described above, when the motor 23 drives and pressurizes the fluid to flow in the first chamber 151 and the second chamber 152 by using the first fan wheel 21 and the second fan wheel 22, the fluid can simultaneously enter the plurality of grooves of the first inner wall 191 or the second inner wall 192, and by the dynamic pressure of the fluid in the flowing process, a repulsive force can be provided relatively to press the first fan wheel 21 and the second fan wheel 22 downward in the axial direction X, so as to ensure that during the rotation process of the first fan wheel 21 and the second fan wheel 22, the

upper surfaces

211 and 221 of the first and

second impellers

21 and 22 can maintain a safety gap with the first and second

inner walls

191 and 192 of the first and

second housings

11 and 12, so as to avoid the friction or collision with the first housing 11 and the second housing 12 to cause abrasion, and further prolong the service life of the fluid conveying device 1.

In one embodiment, the first impeller 21 of the fluid driving member 20 can be provided with a plurality of grooves 212 on the upper surface 211 thereof with respect to the axial direction X, and the second impeller 22 of the fluid driving member 20 can be provided with a plurality of grooves 222 on the upper surface 221 thereof with respect to the axial direction X. Moreover, a plurality of grooves (not shown) are disposed on the first inner wall 191 of the first casing 11 and the second casing 12 above the upper surface 211 of the first impeller 21 in the axial direction X, and a plurality of grooves (not shown) are disposed on the second inner wall 192 of the first casing 11 and the second casing 12 above the upper surface 221 of the second impeller 22 in the axial direction X, so as to further ensure that a safety gap is maintained between the upper surface 211 of the first impeller 21 and the upper surface 221 of the second impeller 22 and the first inner wall 191 and the second inner wall 192 of the first casing 11 and the second casing 12 during the rotation of the first impeller 21 and the second impeller 22.

Fig. 10 is a combined cross-sectional view of a fluid transport device according to an embodiment of the present invention with the restriction members separated. Referring to fig. 10, in an embodiment, the motor 23 of the fluid delivery device 1 of the present invention may have a central shaft 231, a permanent magnet 232 and a stator 233, wherein the central shaft 231 may penetrate through the first impeller 21, the second impeller 22 and the stator 233 in the axial direction X, so that two opposite ends of the central shaft 231 may be fixed in the accommodating space 15, and the radial cross section of two opposite ends of the central shaft 231 may be non-circular, so as to ensure that the central shaft 231 may be fixed and non-rotatable, the permanent magnet 232 is combined with the second impeller 22, and when the stator 233 is powered on, the permanent magnet 232 and the permanent magnet 232 may generate alternating excitation to drive the first impeller 21, the second impeller 22 and the permanent magnet 232 to rotate around the central shaft 231.

Referring to fig. 10, in an embodiment, the first impeller 21 and the second impeller 22 of the fluid delivery device 1 are rotatably coupled to the central shaft 231, and at least one bearing may be disposed between the central shaft 231 and the first impeller 21 and the second impeller 22; for example: a first bearing 24 can be disposed between the first impeller 21 and the central shaft 231, and a second bearing 25 can be disposed between the second impeller 22 and the central shaft 231, wherein the first bearing 24 and the second bearing 25 can be selected from plastic bearings or ceramic bearings, etc. by using the design of the first bearing 24 and the second bearing 25, the first impeller 21 and the second impeller 22 can rotate stably and smoothly with the central shaft 231 as the center under the precondition that the central shaft 231 is fixed.

In one embodiment, there is a gap between the motor 23 and the peripheral wall of the housing 10, there is a gap between the first fan wheel 21 and the second fan wheel 22 and the inner peripheral wall of the housing 10, and there is a gap between the first bearing 24 and the second bearing 25 and the central shaft 231; the gaps jointly form a flow channel for the fluid to flow circularly. In one embodiment, the gap between the first impeller 21 and the inner peripheral wall of the housing 10 and the gap between the first bearing 24 and the central shaft 231 form a first flow path, so that the fluid flows upward from the bottom gap between the first bearing 24 and the central shaft 231 to the space above the first impeller 21. In one embodiment, the gap between the second impeller 22 and the inner peripheral wall of the housing 10, the gap between the motor 23 and the peripheral wall of the housing 10, and the gap between the second bearing 25 and the central shaft 231 form a second flow path, so that the fluid flows upward from the bottom gap between the second bearing 25 and the central shaft 231 to the space above the second impeller 22. Therefore, when the fluid flows between the first bearing 24, the second bearing 25 and the center shaft 231, the fluid can be used for lubricating the first bearing 24, the second bearing 25 and the center shaft 231 at the same time, and the cooling effect is generated, so as to effectively prolong the service life of the fluid conveying device, and reduce the noise generated during the operation.

Fig. 11 is a perspective view of a first bearing or a second bearing of a fluid conveying device according to an embodiment of the present invention. Referring to fig. 10 and 11, in one embodiment, the at least one bearing (e.g., the first bearing 24 and the second bearing 25) may have a plurality of

axial grooves

241, 251 disposed along the axial direction X to increase the amount of fluid flowing through the gap between the first bearing 24 and the second bearing 25 and the central shaft 231, thereby increasing the lubrication and cooling effect. Referring to fig. 7, 8, 9, 10 and 11, in one embodiment, the inner wall of the at least one bearing (e.g., the first bearing 24 and the second bearing 25) may have a plurality of inner grooves (the shape of the inner grooves is the shape of the grooves shown in fig. 7, 8 and 9), such as: a plurality of herringbone inner grooves (as shown in fig. 7), a plurality of herringbone inner grooves, an annular inner groove (as shown in fig. 8), and a plurality of arc-shaped inner grooves (as shown in fig. 9). Therefore, when the fluid flows between the first bearing 24 and the second bearing 25 and the central shaft 231, a safety gap can be ensured between the central shaft 231 and the first bearing 24 and the second bearing 25 by using the dynamic pressure of the fluid in the flowing process, so as to avoid unnecessary collision between the components.

The utility model discloses fluid conveying device utilizes these a plurality of restrictions, and the clamp fits the periphery after this first casing and this second casing are to closing to the equipment this first casing and this second casing can promote the equipment convenience, and can not cause the cracked problem of this first casing or this second casing because of the application of force is improper, in order to promote the product yield. Moreover, the plurality of limiting pieces can improve the sealing and waterproof effects of the shell.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations of the above-described embodiments may be made by those skilled in the art without departing from the spirit of the invention. The scope of the claims of the present invention should be determined by reference to the following claims.

Claims

1. A fluid transfer device, comprising:

the shell is provided with a first shell, a second shell and a plurality of limiting pieces, the first shell and the second shell are oppositely combined in a relative joint direction, and the limiting pieces are respectively clamped on the periphery of the oppositely combined first shell and second shell; and

the fluid driving part is provided with a motor and at least one impeller, the motor and the at least one impeller are arranged in the first shell and the second shell, and the motor is used for driving the at least one impeller to rotate.

2. The fluid delivery device according to claim 1, wherein the first housing has a first extension portion disposed at a periphery of the first housing, the second housing has a second extension portion disposed at a periphery of the second housing, and the restriction members respectively clamp the first extension portion and the second extension portion.

3. The fluid delivery device according to claim 2, wherein the first extension comprises a plurality of arc-shaped segments and a plurality of straight segments, and the second extension comprises a plurality of arc-shaped segments and a plurality of straight segments.

4. The fluid delivery device according to claim 3, wherein the plurality of limiting members comprises two limiting members, each limiting member comprises two arc portions and a straight portion, the two arc portions of each limiting member clamp the arc-shaped sections of the first extension portion and the second extension portion which are oppositely combined, and the straight portion of each limiting member clamps the straight sections of the first extension portion and the second extension portion which are oppositely combined.

5. The fluid delivery device according to claim 3, wherein the plurality of restrictions comprise two restrictions, each restriction comprising a straight portion, the straight portion of each restriction correspondingly engaging the straight portion of the first extension and the straight portion of the second extension that are aligned.

6. The fluid delivery device according to claim 3, wherein the plurality of restrictions comprises four restrictions, each restriction comprising an arc that correspondingly clamps the arc of the first extension and the arc of the second extension in apposition.

7. The fluid delivery device according to claim 3, wherein the plurality of straight sections of the first extension portion comprises a plurality of first straight sections and a plurality of second straight sections, the length of the first straight section of the first extension portion is greater than the length of the second straight section, the plurality of straight sections of the second extension portion comprises a plurality of third straight sections and a plurality of fourth straight sections, and the length of the third straight section of the second extension portion is greater than the length of the fourth straight section.

8. The fluid delivery device according to claim 7, wherein the plurality of restriction members comprise two restriction members, each restriction member comprises two arc portions and a straight portion, the two arc portions of each restriction member correspondingly clamp the arc-shaped sections of the first extension portion and the second extension portion which are oppositely combined, and the straight portion of each restriction member correspondingly clamps the second straight section of the first extension portion and the fourth straight section of the second extension portion which are oppositely combined.

9. The fluid delivery device according to claim 2, wherein a sealing ring is disposed between the first extension of the first housing and the second extension of the second housing.

10. The fluid delivery device according to claim 9, wherein the sealing ring is a waterproof rubber sealing ring or a waterproof silicone sealing ring.

11. The fluid delivery device according to claim 2, wherein at least one of the first extension portion and the second extension portion comprises a positioning protrusion, and at least one of the restriction members comprises a positioning recess disposed at a corresponding position of the positioning protrusion for receiving the positioning protrusion.

12. The fluid delivery device according to claim 2, wherein the first extension or the second extension has a perimeter length, the restrictions have a total length, the total length is a sum of individual lengths of the restrictions, and the total length is 70% or more than 70% of the perimeter length.

13. The fluid delivery device according to claim 1, wherein the housing comprises a receiving space for receiving the at least one impeller and the motor.

14. The fluid delivery device according to claim 13, wherein the at least one impeller comprises a first impeller and a second impeller, the first impeller and the second impeller coupled together.

15. The fluid delivery device according to claim 14, wherein the receiving space defines a first chamber, a second chamber and a third chamber, the second chamber is located between the first chamber and the third chamber in an axial direction perpendicular to the relative engagement direction, the first impeller is disposed in the first chamber, the second impeller is disposed in the second chamber, and the motor is disposed in the third chamber.

16. The fluid delivery device according to claim 15, wherein the third chamber has at least a first positioning portion, the motor has at least a second positioning portion, and the first positioning portion and the second positioning portion are correspondingly positioned.

17. The fluid delivery device according to claim 16, wherein the first positioning portion and the second positioning portion are respectively a plane surface abutting against each other.

18. The fluid delivery device according to claim 15, wherein the housing defines a first delivery portion and a second delivery portion, the first delivery portion and the second delivery portion are connected to the accommodating space, the first delivery portion is correspondingly connected to the first chamber, the second delivery portion is correspondingly connected to the second chamber, and the first delivery portion and the second delivery portion are disposed in the first housing.

19. The fluid delivery device according to claim 2, wherein each of the restricting members includes a receiving portion for receiving the first and second extension portions in alignment.

20. The fluid delivery device according to claim 19, wherein each of the restrictions is n-shaped, each of the restrictions comprises a first side, a second side, and a third side, the first side and the second side corresponding to each other, and the third side connecting the first side and the second side.

21. The fluid delivery device according to claim 14, wherein the first impeller of the fluid driving member is provided with a plurality of grooves with respect to an upper surface in an axial direction, and the second impeller of the fluid driving member is provided with a plurality of grooves with respect to an upper surface in the axial direction.

22. The fluid delivery device of claim 21, wherein the plurality of grooves are formed by a plurality of chevron-shaped grooves circumferentially disposed around the upper surface of the first impeller or the upper surface of the second impeller, respectively.

23. The fluid delivery device according to claim 21, wherein the plurality of grooves comprises a plurality of chevron-shaped grooves and an annular groove, the annular groove is disposed on the upper surface of the first impeller or the upper surface of the second impeller, and the chevron-shaped grooves are spaced apart from and overlap the annular groove to circumferentially surround the upper surface of the first impeller or the upper surface of the second impeller.

24. The fluid delivery device according to claim 21, wherein the plurality of grooves comprises a plurality of arcuate grooves circumferentially disposed around the upper surface of the first impeller or the upper surface of the second impeller, respectively.

25. The fluid delivery device according to claim 14 or 21, wherein a first inner wall of the first housing and the second housing is provided with a plurality of grooves above an upper surface with respect to an axial direction of the first impeller, and a second inner wall of the first housing and the second housing is provided with a plurality of grooves above an upper surface with respect to the axial direction of the second impeller.

26. The fluid delivery device according to claim 25, wherein the plurality of grooves are formed by a plurality of herringbone grooves, and the herringbone grooves are annularly arranged around the first inner wall or the second inner wall.

27. The fluid delivery device according to claim 25, wherein the plurality of grooves are formed by a plurality of chevron-shaped grooves and an annular groove, the annular groove is disposed on the first inner wall or the second inner wall, and the chevron-shaped grooves are alternately overlapped with the annular groove to surround the first inner wall or the second inner wall in an annular arrangement.

28. The fluid delivery device according to claim 25, wherein the plurality of grooves are formed by a plurality of arc-shaped grooves, and the plurality of arc-shaped grooves are annularly arranged around the first inner wall or the second inner wall respectively.

29. The fluid delivery device according to claim 14, wherein the motor has a central shaft, a permanent magnet and a stator, the central shaft extends through the first impeller, the second impeller and the stator in an axial direction, opposite ends of the central shaft are fixed in the accommodating space, and the permanent magnet is coupled to the second impeller.

30. The fluid delivery device according to claim 29, wherein at least one bearing is disposed between the first and second impellers and the central shaft.

31. The fluid delivery device according to claim 30, wherein a gap is formed between the motor and the inner peripheral wall of the housing, a gap is formed between each of the first impeller and the second impeller and the inner peripheral wall of the housing, a gap is formed between the at least one bearing and the central shaft, and the gaps together form a flow passage for circulating the fluid.

32. The fluid delivery device according to claim 31, wherein the at least one bearing is provided with a plurality of axial grooves based on the axial direction.

33. The fluid delivery device according to claim 31, wherein the inner wall of the at least one bearing has a plurality of inner grooves.

34. The fluid delivery device according to claim 33, wherein the plurality of internal channels comprises: a plurality of herringbone inner grooves, a plurality of herringbone inner grooves and an annular inner groove, or a plurality of arc inner grooves.

35. A housing for a fluid transfer device, the housing comprising:

a first housing having a periphery;

a second shell with a periphery, the first shell and the second shell are involuted in a relative joint direction; and

and the limiting parts are respectively clamped on the peripheries of the first shell and the second shell after being combined.

36. The sheath of claim 35, wherein the first housing has a first extension portion disposed at a periphery of the first housing, the second housing has a second extension portion disposed at a periphery of the second housing, and the restriction members respectively clamp the first extension portion and the second extension portion.

37. The enclosure of claim 36, wherein the first extension comprises a plurality of arcuate segments and a plurality of straight segments, and wherein the second extension comprises a plurality of arcuate segments and a plurality of straight segments.

38. The sheath of claim 37, wherein the plurality of restrictions comprise two restrictions, each restriction comprising two arcuate portions and a straight portion, the two arcuate portions of each restriction correspondingly engaging the arcuate sections of the first and second extensions that are aligned, the straight portion of each restriction correspondingly engaging the straight sections of the first and second extensions that are aligned.

39. The sheath of claim 37, wherein the plurality of restrictions comprises two restrictions, each restriction comprising a straight portion that clamps the straight portion of the first extension and the straight portion of the second extension in an aligned manner.

40. The sheath of claim 37, wherein the plurality of restrictions comprises four restrictions, each restriction comprising an arc that correspondingly clamps the aligned arc segments of the first extension and the second extension.

41. The sheath of claim 37, wherein the plurality of straight sections of the first extension portion comprises a plurality of first straight sections and a plurality of second straight sections, the first straight section of the first extension portion has a length greater than a length of the second straight section, the plurality of straight sections of the second extension portion comprises a plurality of third straight sections and a plurality of fourth straight sections, and the third straight section of the second extension portion has a length greater than a length of the fourth straight sections.

42. The sheath of claim 41, wherein the plurality of restrictions comprise two restrictions, each restriction comprising two arcs and a straight portion, the two arcs of each restriction correspondingly engaging the aligned arcs of the first extension and the second extension, the straight portion of each restriction correspondingly engaging the aligned arcs of the second extension and the fourth extension.

43. The enclosure of claim 36, wherein a sealing ring is disposed between the first extension of the first housing and the second extension of the second housing.

44. A casing for a fluid transfer device according to claim 43, wherein the sealing ring is a waterproof rubber sealing ring or a waterproof silicone sealing ring.

45. The sheath of claim 35, wherein the sheath defines a first delivery portion and a second delivery portion, the first delivery portion and the second delivery portion being disposed in the first housing.

46. The sheath of claim 36, wherein at least one of the first extension portion and the second extension portion includes a positioning protrusion, and at least one of the plurality of limiting members includes a positioning recess disposed at a corresponding position of the positioning protrusion for receiving the positioning protrusion.

47. The sheath of claim 36, wherein the first extension or the second extension has a perimeter length, the plurality of restrictions have a summed length, the summed length being the sum of the individual lengths of the plurality of restrictions, the summed length being 70% or more than 70% of the perimeter length.

48. The sheath of claim 36, wherein each of the restraints includes a receptacle for receiving the first and second extensions in apposition.

49. The enclosure of claim 48, wherein each of the restraints is n-shaped, each of the restraints includes a first side portion, a second side portion, and a third side portion, the first side portion and the second side portion corresponding to each other, and the third side portion connecting the first side portion and the second side portion.