Electromagnetic pump
An electromagnetic pump comprises a cylinder, a piston, a first induction coil, a second induction coil, and a magnetic housing. The piston is slidably disposed in the cylinder. The first induction coil and the second induction coil are fitted over two ends of the cylinder and are alternately provided with a power source to effect an excitation. The piston is caused by the excitation to move linearly back and forth within the cylinder, thereby enabling the piston to draw in fluids and to force out the fluids.
The present invention relates generally to a piston pump, and more particularly to an electromagnetic pump comprising a cylinder, two induction coils, and a piston which is forced by two opposite excitations to engage in a reciprocating linear movement within the cylinder.
BACKGROUND OF THE PRESENT INVENTION As illustrated in
Such a prior art pump as described above has several shortcomings. In the first place, it has a relatively large volume due to the driving mechanism 16. In light of the large overall volume of the prior art pump 10, it is often too large to be fitted into such appliances as dehumidifier, computer, water bed, reverse-osmosis machine, and the miniaturized icy water server. The piston 15 is fastened at one end with the driving mechanism 16, thereby allowing only the free end of the piston 15 to engage in the actions of driving the fluid into and out of the fluid pipe 11. In another words, the efficiency of the piston 15 is unduly compromised. As shown by an enlarged portion of
The primary objective of the present invention is to provide an electromagnetic pump which is free of the deficiencies of the prior art pump described above.
In keeping with the principle of the present invention, the foregoing objective of the present invention is attained by the electromagnetic pump comprising a cylinder, a piston, and two induction coils. The piston is magnetically excited by two opposite magnetic forces brought about by the two induction coils, so as to move linearly within the cylinder in a reciprocating manner. In light of absence of mechanical mechanism by means of which the piston of the conventional pump is driven, the electromagnetic pump of the present invention can be miniaturized. The electromagnetic pump of the present invention is relatively more efficient, thanks to the magnetically-driven piston whose both ends are engageable with the pumping of fluids. As the piston is driven to move back and forth within the cylinder, there is lack of a mechanical friction between the piston and the cylinder. As a result, the service life span of the piston is greatly prolonged. The maintenance cost of the piston is also reduced by virtue of the fact that the piston is devoid of a washer. The electromagnetic pump of the present invention is operated by the excitation which can be adjusted in intensity by a current oscillation frequency, thereby enabling the piston to be driven at various rates so as to enhance versatility of the electromagnetic pump of the present invention.
The features and the advantages of the present invention will be more readily understood upon a thoughtful deliberation of the following detailed description of the present invention with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
As shown in
The cylinder 20 has a closed end 21 and an open end 22. The closed end 21 is provided with an axial hole 211. The open end 22 is provided with a connection pipe 23. The cylinder 20 is provided in the interior with a piston chamber 24 situated between the closed end 21 and the connection pipe 23.
The magnetic piston 30 is slidably disposed in the piston chamber 24 of the cylinder 20 and is provided with a first end face 31 and a second end face 32.
The first induction coil 40 is fitted over one end of the cylinder 20 and is provided with a first excitation hole 41 extending along an axial direction thereof, a first power source wire 42, and a first excitation frame 43. The first excitation frame 43 and the first excitation hole 41 are respectively provided in the corresponding side with a through hole 431, 432.
The second induction coil 50 is fitted over other end of the cylinder 20 and is provided with a second excitation hole 51 extending along an axial direction thereof, a second power source wire 52, and a second excitation frame 53. The second excitation frame 53 and the second excitation hole 51 are respectively provided in the corresponding side with a through hole 531, 32.
The magnetic housing 60 is provided in two ends with a seat 61, 62 for securing respectively the closed end 21 and the open end 22 of the cylinder 20.
As shown in
As illustrated in
Whenever an excitation is effected by the first induction coil 40 or the second induction coil 50, the magnetic housing 60 produces simultaneously a counter magnetic force, by means of which the piston 30 is magnetically floated in the piston chamber 24 of the cylinder 20. As a result, there is absence of a mechanical friction between the piston 30 and the wall of the piston chamber 24. The piston 30 is thus prevented from being worn out by the mechanical friction.
As shown in
The embodiments of the present invention described above serve to illustrate the features and the advantages of the present invention over the prior art pump. The piston of the present invention is magnetically driven, thereby resulting in a substantial reduction in volume of the pump of the present invention. The present invention can be thus miniaturized to broaden its application. The magnetically-driven piston of the present invention moves back and forth in the cylinder without causing a mechanical friction, thereby preventing the piston from being worn out. The versatility of the pump of the present invention is enhanced by a circuit design enabling the rate of the linear motion of the piston of the present invention to be adjusted by the current oscillation frequency.
The embodiments described above are to be regarded in all respects as being illustrative and nonrestrictive. Accordingly, the present invention may be embodied in other specific forms without deviating from the spirit thereof. The present invention is therefore to be limited only by the scopes of the following claims.
Claims
1. An electromagnetic pump comprising:
- a cylinder having a closed end and an open end, said closed end being provided with an axial hole, said open end being provided with a connection pipe fastened therewith, said cylinder being provided in an interior with a piston chamber situated between said closed end and said connection pipe;
- a magnetic piston disposed slidably in said piston chamber of said cylinder and provided with a first end face and a second end face opposite to said first end face;
- a first induction coil fitted over one end of said cylinder and provided with a first excitation hole extending along an axial direction thereof, a first power source wire, and a first excitation frame whereby said first excitation frame and said first excitation hole are respectively provided in a corresponding side with a through hole; and
- a second induction coil fitted over other end of said cylinder and provided with a second excitation hole extending along an axial direction thereof, a second power source wire, and a second excitation frame whereby said second excitation frame and said second excitation hole are respectively provided in a corresponding side with a through hole.
2. The pump as recited in claim 1 further comprising a magnetic housing of a u-shaped construction whereby said magnetic housing is provided at two ends with seat to facilitate the joining of said magnetic housing with said closed end and said open end of said cylinder.
3. The pump as recited in claim 1, wherein said connection pipe is provided in an outer wall with an annular groove and a washer located in said annular groove whereby said outer wall of said connection pipe comes in contact with said cylinder.
Type: Application
Filed: Jul 25, 2003
Publication Date: Jan 27, 2005
Inventor: Hsiang-Yun Wang (Jhongli)
Application Number: 10/626,520