Ultra-thin miniature pump
An ultra-thin miniature pump applied to transport a fluid includes a main body, a rotor, and a stator. The main body includes a cover part and a bottom part. A joint surface between the cover part and the bottom part possesses an anti-leakage device, and a chamber including a suction port and a discharge port is formed inside the main body. The rotor disposed in the chamber includes a magnet set, an impeller, and a central shaft. The magnet set is connected on the surface of the impeller, and the impeller with the magnet set is aligned by the central shaft and rotates in coaxial. The stator disposed in the chamber includes a plurality of coils corresponding to the magnet set axially. The coils and the magnet set generate an axial magnetic flux to make the impeller rotate for transporting the fluid from the suction port to the discharge port.
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1. Field of Invention
The present invention relates to an ultra-thin miniature pump, especially for an ultra-thin miniature pump, which utilizes a design of axial-flux micromotor and possesses advantages of structure miniaturization, high rotating torque, high head rise, and excellent heat dissipation capability.
2. Related Art
Miniature pumps are very important units which are employed in various fields such as liquid cooling systems, transporting devices of fuel cells, and artificial hearts. Therefore, it is a general objective of designers and manufacturers to design and manufacture the miniature pumps which include advantages of good anti-leakage capability, high rotating torque, high head rise, excellent heat dissipation capability, and structure miniaturization.
A centrifugal pump mainly includes coils of a stator, magnets of a rotor, and an impeller. The centrifugal pump utilizes the flow of electric currents in the coils of the stator to create magnetic fields. Then, the magnetic fields act upon the magnets of the rotor to generate a magnetic force, and the impeller is rotated by the magnetic force to transport fluids. According to various motor disposing types of the pumps, the pumps could be divided into external motor pumps and internal motor pumps. The external motor pumps and the internal motor pump are described respectively as following:
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- a. The external motor pump has some features that its motor and pump are split and a transmission shaft between the motor and the pump is utilized to transmit motive force. There are advantages of the external motor pump that the external motor pump is easy to be assembled and the pump has a low leakage rate. However, due to the longer transmission shaft between the pump and the motor, the external motor pump would need bigger space for assembling. Moreover, it is more difficult to align a shaft of the pump with a shaft of the motor. If the shaft of the pump is not aligned with the shaft of the motor, the external motor pump will generate more vibratile noise and has a shorter lifetime.
- b. The internal motor pump has a feature that its motor is disposed inside the pump and located in the center of an impeller. Since a diameter of the motor is restricted with the shape of vanes of the impeller, rotating torsion of the motor will be constricted. If the diameter of the motor is increased, the size of the vanes will be constricted and the flow rate or output flow pressure will be limited. Moreover, since the motor is located in the center of the impeller, heat of the motor is difficult to dissipate and a lifetime of the motor will be influenced.
Accordingly, the miniature pumps of the prior art mostly belong to the internal motor pumps for reasons of structure miniaturization and little vibratile noise. However, the miniature pumps of the prior -art, which are disclosed by Taiwan Patent Issued No. 00587784, M321653 and United States Patent Issued No. 20030072656A1, generally adopt a design of radial-flux motor and they are hard to avoid some drawbacks of low rotating torque as well as low head rise and poor heat dissipation capability of their motors. The above drawbacks are difficult problems what the people of the related fields want to solve.
SUMMARY OF THE INVENTIONIn view of the above problems, an object of the present invention is to provide an ultra-thin miniature pump to solve drawbacks of miniature pumps of the prior art, such as low rotating torque, low head rise and poor heat dissipation capability of pumps, and achieve structure miniaturization.
According to one embodiment of the present invention, an ultra-thin miniature pump is provided. The ultra-thin miniature pump of the present invention is applied to transport a fluid and comprises a main body, a rotor, and a stator. The main body includes a cover part and a bottom part. A joint surface between the cover part and the bottom part possesses an anti-leakage device, and a chamber including a suction port and a discharge port is formed inside the main body. The rotor disposed in the chamber includes a magnet set, an impeller, and a central shaft. The magnet set is connected on a surface of the impeller, and the impeller with the magnet set is aligned by the central shaft and rotates in coaxial manner. The stator disposed in the chamber includes a plurality of coils corresponding to the magnet set axially. The coils and the magnet set generate an axial magnetic flux to make the impeller rotate for transporting the fluid from the suction port to the discharge port. A sealing layer seals the stator, and the fluid and the coil are isolated by this sealing layer.
According to another embodiment of the present invention, an ultra-thin miniature pump is provided. The ultra-thin miniature pump of the present invention is applied to transport a fluid and comprises a main body, a rotor, a stator, and a sealing layer. The main body includes a cover part, a body part, and a bottom part combined in sequence. A joint surface between the cover part and the body part possesses an anti-leakage device, and a chamber including a suction port and a discharge port is formed inside the main body. The rotor disposed in the chamber includes a magnet set, an impeller, and a central shaft. The magnet set is connected on a surface of the impeller, and the impeller and the magnet set are aligned by the central shaft and rotate in coaxial manner. The stator disposed in the chamber of the body part and the bottom part includes a plurality of coils corresponding to the magnet set axially. The coils and the magnet set generate an axial magnetic flux to make the impeller rotate for transporting the fluid from the suction port to the discharge port. The sealing layer located in a portion of the chamber of the body part and the bottom part seals the coils and prevents the fluid from leaking through a joint surface between the body part and the bottom part.
The ultra-thin miniature pump of the present invention utilizes a design of axial-flux micromotor. Since the magnet set is integrated with the impeller and the coils are axially aligned with the magnet set, the ultra-thin miniature pump of the present invention is light in weight and compact in size. Furthermore, since the magnet set is designed according to the shape of impeller of vortex pumps, there is more space for a motor of the ultra-thin miniature pump to increase its diameter and then the rotating torque and the head rise of the pump are promoted. Moreover, since the motor has larger dissipation space, it will prevent the motor from overheating and increase the lifetime of the motor.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
The present invention will become more fully understood from the detailed description given herein below for illustration only, and which thus is not limitative of the present invention, and wherein:
The features and practice of the present invention will be illustrated below in detail through preferred embodiments with reference to the accompanying drawings.
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Compared to the prior art, the ultra-thin miniature pump of the present invention utilizes a design of axial magnetic flux. Since the magnet set is integrated with the impeller and the coils are axially aligned with the magnet set, the ultra-thin miniature pump of the present invention is light in weight and compact in size. Furthermore, since the magnet set is designed according to the shape of impeller of vortex pumps, there is more space for a motor of the ultra-thin miniature pump to increase its diameter and then the rotating torque and the head rise of the pump are promoted. Moreover, since the motor has larger dissipation space, it will prevent the motor from overheating and increase the lifetime of the motor.
Claims
1. An ultra-thin miniature pump, which is applied to transport a fluid, comprising:
- a main body including a cover part and a bottom part, wherein a joint surface between the cover part and the bottom part possesses an anti-leakage device, and a chamber including a suction port and a discharge port is disposed inside the main body;
- a rotor being disposed in the chamber and including a magnet set, an impeller, and a central shaft, wherein the magnet set is connected on a surface of the impeller, and the impeller and the magnet set are aligned by the central shaft and rotate in coaxial manner; and
- a stator being disposed in the chamber and including a plurality of coils corresponding to the magnet set axially, wherein the coils and the magnet set generate an axial magnetic flux to make the impeller rotate for transporting the fluid from the suction port to the discharge port.
2. The ultra-thin miniature pump as claimed in claim 1, wherein the cover part includes a fixed base and a bearing disposed in the fixed base, and the central shaft is connected to the bearing for rotating.
3. The ultra-thin miniature pump as claimed in claim 1, wherein the bottom part includes a fixed base and a bearing disposed in the fixed base, and the central shaft is connected to the bearing for rotating.
4. The ultra-thin miniature pump as claimed in claim 1, wherein the anti-leakage device is a gasket which is disposed between the cover part and the bottom part.
5. The ultra-thin miniature pump as claimed in claim 1, wherein the magnet set is an annular magnet, and the annular magnet is fixed on the surface of the impeller and located between a plurality of vanes of the impeller and the central shaft.
6. The ultra-thin miniature pump as claimed in claim 5, wherein the surface of the impeller includes an annular cavity located between the vanes of the impeller and the central shaft, and the annular magnet is corresponding to the annular cavity and fixed therein.
7. The ultra-thin miniature pump as claimed in claim 1, wherein the magnet set includes a plurality of magnets, and the magnets are corresponding to the coils respectively and fixed on the surface of the impeller.
8. The ultra-thin miniature pump as claimed in claim 1, wherein the coils are sealed by a sealing layer.
9. The ultra-thin miniature pump as claimed in claim 8, wherein the main body further includes at least an opening, the coils electrically connect outside of the main body, and the coils and the opening are sealed by the sealing layer.
10. The ultra-thin miniature pump as claimed in claim 1, wherein a stripper is disposed between an inside wall of the main body and the impeller, and the stripper is located between the suction port and the discharge port to prevent a pressurized fluid in an outlet region from flowing into an inlet region at low pressure.
11. An ultra-thin miniature pump, which is applied to transport a fluid, comprising:
- a main body including a cover part, a body part, and a bottom part combined in sequence, wherein a joint surface between the cover part and the body part possesses an anti-leakage device, and a chamber including a suction port and a discharge port is formed inside the main body;
- a rotor being disposed in the chamber and including a magnet set, an impeller, and a central shaft, wherein the magnet set is connected on a surface of the impeller, and the impeller and the magnet set are aligned by the central shaft and rotate in coaxial manner;
- a stator being disposed in the chamber of the body part and the bottom part and including a plurality of coils corresponding to the magnet set axially, wherein the coils and the magnet set generate an axial magnetic flux to make the impeller rotate for transporting the fluid from the suction port to the discharge port; and
- a sealing layer located in a portion of the chamber of the body part and the bottom part for sealing the coils and preventing the fluid from leaking through a joint surface between the body part and the bottom part.
12. The ultra-thin miniature pump as claimed in claim 11, wherein the cover part includes a fixed base and a bearing disposed in the fixed base, and the central shaft is connected to the bearing for rotating.
13. The ultra-thin miniature pump as claimed in claim 11, wherein the bottom part includes a fixed base and a bearing disposed in the fixed base, and the central shaft is connected to the bearing for rotating.
14. The ultra-thin miniature pump as claimed in claim 11, wherein the anti-leakage device is a gasket which is disposed between the cover part and the body part.
15. The ultra-thin miniature pump as claimed in claim 11, wherein the magnet set is an annular magnet, and the annular magnet is fixed on the surface of the impeller and located between a plurality of vanes of the impeller and the central shaft.
16. The ultra-thin miniature pump as claimed in claim 15, wherein the surface of the impeller includes an annular cavity located between the vanes of the impeller and the central shaft, and the annular magnet is corresponding to the annular cavity and fixed in the annular cavity.
17. The ultra-thin miniature pump as claimed in claim 11, wherein the magnet set includes a plurality of magnets, and the magnets are corresponding to the coils respectively and fixed on the surface of the impeller.
18. The ultra-thin miniature pump as claimed in claim 11, wherein the main body further includes at least an opening, the coils electrically connect outside of the main body, and the coils and the opening are sealed by the sealing layer.
19. The ultra-thin miniature pump as claimed in claim 11, wherein a stripper is disposed between an inside wall of the main body and the impeller, and the stripper is located between the suction port and the discharge port to prevent a pressurized fluid in an outlet region from flowing into an inlet region at low pressure.
Type: Application
Filed: Dec 27, 2007
Publication Date: Jul 2, 2009
Applicant:
Inventors: Xin-Yi Wu (Tainan City), Tsung-Wen Huang (Tainan City), Kuo-Feng Chen (Pingtung County), Yih-Ru Jiang (Kaohsiung County)
Application Number: 12/005,348
International Classification: F04B 17/00 (20060101);