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Magnetic suspension pumpsRelated Patent Categories: Pumps, Motor Driven, Electric Or Magnetic Motor, Reciprocating Rigid Pumping MemberMagnetic suspension pumps description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070212237, Magnetic suspension pumps. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] This application claims the benefit of Chinese Patent Application No. 200410051345.6 filed which is explicitly incorporated by reference in its entity. TECHNICAL FIELD OF THE INVENTION [0002] This invention relates to a piston pump, and more particularly to a magnetically suspended piston pump. BACKGROUND OF THE INVENTION [0003] In the prior art, a piston pump typically comprises a cylinder, a piston, an inlet valve and an outlet valve located in the cylinder, and a driving mechanism connected to the piston. The driving mechanism usually comprises a crank connecting rod, a vapor device, and a magnetic connecting rod driving device, etc. According to the number of the cylinders or the number of the inlet/outlet valves, the piston pump may be classified as a single-cylinder, a double-cylinder and a triple-cylinder piston pump, or as a single-purpose and a double-purpose piston pump. [0004] The conventional piston pump has disadvantages that it is of a relatively short service life and includes some easily worn-out parts, for a contact between a piston and a pump will lead to abrasion. Particularly, if the pump is kept continuously working for a long time (e.g., 24 hours a day), some parts of the piston pump should be replaced within 2 years. Even the pump made from the best abrasion-resistance materials will be worn or penetrated (diaphragm pump) in the end. Moreover, resistance generated due to the friction or tension between the portions of the pump (especially working at a high speed) gives rise to a low power efficiency of the pump. That is, power exchanging efficiency of the pump is reduced. SUMMARY OF THE INVENTION [0005] It is an object of the present invention to provide a magnetically suspended piston pump having a new configuration, in which a piston of a cylinder is able to work at a magnetically suspended situation without friction, thereby enhancing the power efficiency and the reliability of the pump. [0006] To accomplish the object of the present invention, a magnetically suspended piston pump is provided, comprising a cylinder, a piston, an inlet valve and an outlet valve located in the cylinder, and a driving mechanism connected to the piston, in which the cylinder is made of permanent magnet, and the piston embedded within the cylinder is also made of permanent magnet. In the invention, the magnetic polarity of an outer surface of the piston is the same as that of an inner surface of the cylinder, and a circular magnetic plate is provided at an end of the cylinder, in which a side surface of the circular magnetic plate towards an inside portion of the cylinder has the same magnetic polarity as a surface of the piston facing to the magnetic plate. [0007] According to an embodiment of the present invention, the circular magnetic plate disposed within the cylinder is made of permanent magnet or electromagnet. [0008] According to another embodiment of the present invention, the piston pump comprises a magnetic connecting rod driving device. The cylinder of this embodiment is configured in a double-cylinder structure, which comprises an upper cylinder and a lower cylinder. A magnetically suspended piston located in the upper cylinder is connected to another magnetically suspended piston located in the lower cylinder by a vertical connecting rod. Two circular permanent magnets are provided at the connecting rob, and a pair of electromagnets are provided at two sides of the circular permanent magnets. A group of coils is disposed in each of the electromagnets. The two groups of coils are connected with each other in series. [0009] In the present invention, two electromagnets, which are controlled by an electronic circuit, may be provided at both ends of the inside of the cylinder, respectively. The electronic circuit may comprise a common-mode rejection circuit, a microprocessor control circuit, and a power amplification circuit. A signal generated by the electromagnets for indicating a variation of the magnetic field is transmitted to the microprocessor control circuit through the common-mode rejection circuit. The microprocessor control circuit generates a response to the signal for driving the power amplification circuit, and then an output signal of the power amplification circuit is transmitted to the electromagnets. [0010] Compared with the prior art, the present invention has the following advantages: [0011] 1. The piston fit within the cylinder of the invention works at a magnetically suspended situation without friction between the piston and the cylinder, which thereby renders the piston pump of a higher efficiency and lower power consumption. The power consumption of the invention is generally about half that of a conventional piston pump. [0012] 2. The piston pump of the present invention is durable and reliable and in no need of replacement of any parts. Moreover, the piston pump of the invention shows more advantageous when it is employed in an apparatus which needs to work continuously, such as a medical device. BRIEF DESCRIPTION OF THE DRAWINGS [0013] FIG. 1 is a schematic view showing a configuration of the present invention; [0014] FIG. 2 is a schematic view showing a symmetric double-cylinder piston pump of the present invention; [0015] FIG. 3 is a schematic view of an embodiment according to the present invention, in which electromagnets are employed and controlled by an electronic circuit; [0016] FIG. 4 is an electronic circuit diagram of an embodiment according to the present invention, in which the electronic circuit is employed to control electromagnets; and [0017] FIG. 5 is a schematic view showing principles of a magnetic circuit according to the present invention. DETAILED DESCRIPTION OF THE INVENTION [0018] The present invention and various advantages thereof will be described with reference to exemplary embodiments in conjunction with the drawings. [0019] Refer to FIGS. 1-5, a magnetically suspended piston pump of the present invention mainly comprises a cylinder 1 made of a cylindrical permanent magnet, a piston 2 made of a circular permanent magnet, a circular magnetic plate 3 located at an end of the cylinder 1, an inlet valve 4 and an outlet valve 5 located at another end of the cylinder 1, and a magnetic connecting rod driving device 8. Continue reading about Magnetic suspension pumps... Full patent description for Magnetic suspension pumps Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Magnetic suspension pumps patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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