PERMANENT MAGNET LINEAR PISTON PUMP
A permanent magnet linear piston pump comprises a piston body, a cylinder body, a permanent magnet assembly and an electromagnetic coil. The piston body is arranged in a piston cavity by a liquid sealing movable fit mode. An inner magnetic body and an outer magnetic body are disposed on at least one side surface of the cylinder body. An electromagnetic coil is axially and distributively wound around a coil supporting member which is disposed at an outside surface of the cylinder body. The electromagnetic coil is disposed between the inner magnetic body and the outer magnetic body. By the above structure, the pump needs not subject the electromagnetic coil to a sealing treatment, thereby attaining a simple structure, more convenient manufacture, lower costs, a reliable operation and convenient maintenance.
1. Field of the Invention
The present invention relates to a linear piston pump, and more particularly to a permanent magnet linear piston pump.
2. Description of the Related Art
The advantages of the magnetic-force linear piston pump contain a high operating pressure, a simple structure, a low consumption of energy and noises and a long durability. Therefore, it becomes more and more important and is applied to more and more applications. The mechanical movement and principle of the magnetic-force linear piston pump are similar to those of the plunger pump. Both of them take advantage of the relative reciprocating motion between the piston and the cylinder body to incur the variable capacity of the sealed piston cavity inside the pump, thereby inputting and outputting the fluid medium. A prior disclosure of CN1554868 as published on 2004 Dec. 15 and named by “magnetic-force linear piston pump” discloses a magnetic-force linear piston pump which comprises a housing in which a cylinder body and a piston are disposed. The piston is disposed inside the cylinder body with an axial movable airtight fit. On the outer periphery of the cylinder body is an electromagnetic coil. The electromagnetic coil is fixed into the housing. The electromagnetic coil is connected to an oscillating power supply. A permanent magnet is further disposed on the outer periphery of the cylinder body. The permanent magnet and the cylinder body are connected and positioned. One end of the piston is fixed to the housing, and the other end thereof is disposed within an inner hole of the cylinder body. A fluid hole is disposed on the piston. A first unidirectional valve and a second unidirectional valve are relatively disposed in the fluid hole or in the inner cavity of the cylinder body, thereby constructing three opposite and independent cavities in sequence, namely a low-pressure cavity, a variable-capacity operating cavity and a high-pressure cavity. The low-pressure cavity is communicated with an inlet pipe. The high-pressure cavity is communicated with an outlet pipe. However, since the electromagnetic coil is disposed inside the housing, the structure is unreasonable, which incurs an inconvenient installation. Furthermore, the electromagnetic coil and the permanent magnet are all set in the low-pressure cavity, so the sealing treatment to the electromagnetic coil and the permanent magnet is necessary, which incurs a complexity of the manufacture, high costs and hard promotions.
SUMMARY OF THE INVENTIONThe object of the present invention is to overcome the aforementioned problems and to provide a permanent magnet linear piston pump having a simple structure, more convenient manufacture and lower costs.
The permanent magnet linear piston pump in accordance with the present invention comprises a piston body, a cylinder body, a permanent magnet assembly and an electromagnetic coil. It is characterized in that the cylinder body is in a shape of a polygonal prism, an interior of which arranges a piston cavity formed by an axial columnar accommodating cavity. The piston body is arranged in the piston cavity by a liquid sealing movable fit mode. A one-way inlet valve and a one-way outlet valve are disposed on an end face of the piston cavity opposite to an end face of a piston. A set of permanent magnet assembly is disposed on at least one side surface of the cylinder body. The permanent magnet assembly includes an inner mounting plate and an outer mounting plate disposed parallel to the side surface of the cylinder body. The inner plate and the outer mounting plate are made of a permeability magnetic material. An inner magnetic body and an outer magnetic body are respectively disposed on opposite surfaces of the inner mounting plate and the outer mounting plate. The inner magnetic body and the outer magnetic body are disposed oppositely and provide contrary magnetic poles at opposite faces thereof. A coil supporting member is disposed at an outside surface of the cylinder body. The electromagnetic coil is axially and distributively wound around the coil supporting member into a barrel shape. A barrel wall formed by the electromagnetic coil is disposed between the inner magnetic body and the outer magnetic body. An axial sliding slot is formed on the side surface of the cylinder body where the permanent magnet assembly is disposed. A connecting post is disposed on a side surface of the piston body in a radial direction to fit in with the sliding slot by a clearance fit mode. The connecting post penetrates through the sliding slot to be in connection with and in linkage with the inner mounting plate and the outer mounting plate.
By comparison with the prior technique, the present invention has the electromagnetic coil which is axially and distributively wound around the coil supporting member at the outside surface of the cylinder body and needs not subject the electromagnetic coil to a sealing treatment, which attains a simple structure, more convenient manufacture, lower costs, a reliable operation and convenient maintenance.
Preferably, two parts of the columnar accommodating cavity in the cylinder body are disposed symmetrically. The piston body is disposed at a middle portion of the columnar accommodating cavity. Two ends of the piston body are in cooperation with the two parts of the columnar accommodating cavity by the liquid sealing movable fit mode respectively, whereby the two parts of the columnar accommodating cavity are respectively defined as a first piston cavity and a second piston cavity, and the two ends of the piston body are respectively defined as a first piston body and a second piston body. A first one-way inlet valve and a first one-way outlet valve are disposed on an end face of the first piston cavity opposite to an end face of the first piston body. A second one-way inlet valve and a second one-way outlet valve are disposed on an end face of the second piston cavity opposite to an end face of the second piston body. A first inner magnetic body and a second inner magnetic body are respectively and symmetrically disposed at two ends of the inner mounting plate. A first outer magnetic body and a second outer magnetic body are respectively and symmetrically disposed at two ends of the outer mounting plate. A first electromagnetic coil and a second electromagnetic coil are respectively and correspondingly disposed on ribs at two sides of the cylinder body. Accordingly, the same cylinder body forms two permanent magnet linear piston pumps, and the piston body can be in the operating status during the reciprocating motion to attain the higher efficiency.
Preferably, one set of permanent magnet assembly is arranged at each side surface of the cylinder body, which allows the permanent magnet linear piston pump to have a greater power.
Preferably, the cylinder body includes a barrel unit and lids at two ends thereof. Sealing rings are respectively disposed between the lids at the two ends and two end faces of the barrel unit. The barrel unit and the lids at the two ends are connected with each other by a plurality of axial shanks and nuts around an outer periphery of the barrel unit. The shanks construct the coil supporting member. Accordingly, such arrangement designing the cylinder body and the coil supporting member attains a simple structure, a simple manufacturing technique and lower costs.
Preferably, ribs are disposed on edges of the cylinder body. The ribs construct the coil supporting member. The inner mounting plate and the inner magnetic body are disposed in a recess between the ribs at two sides of a same side surface of the cylinder body. Accordingly, such arrangement designing the cylinder body and the coil supporting member attains a simple structure, a simple manufacturing technique, a firm structure and high mechanical intensity.
Preferably, the cylinder body can be a prism having four to six sides, especially a quadrangular prism whose cross-section is in a rectangular shape, whereby the cylinder body in this shape is easier to be processed.
Preferably, the inner mounting plate and the outer mounting plate are made of a permeability magnetic material. A magnetizing coil is sleeved on the inner mounting plate or/and the outer mounting plate. A magnetic field line created by the magnetizing coil is formed in a closed annular shape along the inner mounting plate, the inner magnetic body, the outer magnetic body and the outer mounting plate. Accordingly, the magnetizing coil is sleeved on the inner mounting or/and the outer mounting plate, so an external magnetizing power supply in connection with the magnetizing coil magnetizes the inner magnetic body and the outer magnetic body to retrieve their intensity of magnetism when the intensity of magnetism of two magnetic bodies becomes lessened due to a long term of using the permanent magnet linear piston pump, thereby prolonging the duration of the permanent magnet linear piston pump.
The present invention is further described upon reading following preferred embodiments in conjunction with the accompanying drawings.
Referring to
To attain the higher efficiency of the permanent magnet linear piston pump, the piston body 1 is in the operating state during the reciprocating motion. In the present invention, two permanent magnet linear piston pumps are formed in the same cylinder body 2. Referring to
To retrieve the intensity of magnetism of the inner magnetic body 603 and the outer magnetic body 604 by magnetizing and to prolong the duration of the permanent magnet linear piston pump, the permanent magnet linear piston pump of the present invention can be magnetized. Referring to
From the above preferred embodiments, the one-way inlet valve 4 and the one-way outlet valve 5 can be designed by using a diaphragm structure or by disposing a steel ball and a compression spring in the valve cavity. These arrangements can all satisfy the requirements.
Claims
1. A permanent magnet linear piston pump comprising a piston body (1), a cylinder body (2), a permanent magnet assembly (6) and an electromagnetic coil (3);
- characterized in that said cylinder body (2) is in a shape of a polygonal prism, in which a piston cavity (201) is formed by an axial columnar accommodating cavity, said piston body (1) being disposed in said piston cavity (201) by a liquid sealing movable fit mode, a one-way inlet valve (4) and a one-way outlet valve (5) being disposed on an end face of said piston cavity (201) opposite to an end face of a piston, a set of permanent magnet assembly (6) being disposed on at least one side surface of said cylinder body (2), said permanent magnet assembly (6) including an inner mounting plate (601) and an outer mounting plate (602) disposed parallel to said side surface of said cylinder body (2), said inner mounting plate (601) and said outer mounting plate (602) being made of a permeability magnetic material, an inner magnetic body (603) and an outer magnetic body (604) being respectively disposed on opposite surfaces of said inner mounting plate (601) and said outer mounting plate (602), said inner magnetic body (603) and said outer magnetic body (604) being disposed oppositely and providing contrary magnetic poles at opposite faces thereof, a coil supporting member being disposed at an outside surface of said cylinder body (2), said electromagnetic coil (3) being axially and distributively wound around said coil supporting member into a barrel shape, a barrel wall formed by said electromagnetic coil (3) being disposed between said inner magnetic body (603) and said outer magnetic body (604), an axial sliding slot (203) being formed on said side surface of said cylinder body (2) where said permanent magnet assembly (6) is disposed, a connecting post (101) being radially disposed on a side surface of said piston body (1) to fit in with said sliding slot (203) by a clearance fit mode, said connecting post (101) penetrating through said sliding slot (203) to be in connection with and in linkage with said inner mounting plate (601) and said outer mounting plate (602).
2. The permanent magnet linear piston pump according to claim 1, wherein two parts of said columnar accommodating cavity in said cylinder body (2) are disposed symmetrically, said piston body (1) being disposed at a middle portion of said columnar accommodating cavity, two ends of said piston body (1) being in cooperation with said two parts of said columnar accommodating cavity by said liquid sealing movable fit mode respectively, whereby said two parts of said columnar accommodating cavity are respectively defined as a first piston cavity (2011) and a second piston cavity (2012) and said two ends of said piston body are respectively defined as a first piston body (1a) and a second piston body (1b), a first one-way inlet valve (4a) and a first one-way outlet valve (5a) being disposed on an end face of said first piston cavity (2011) opposite to an end face of said first piston body (1a), a second one-way inlet valve (4b) and a second one-way outlet valve (5b) being disposed on an end face of said second piston cavity (2012) opposite to an end face of said second piston body (1b), a first inner magnetic body (603a) and a second inner magnetic body (603b) being respectively and symmetrically disposed at two ends of said inner mounting plate (601), a first outer magnetic body (604a) and a second outer magnetic body (604b) being respectively and symmetrically disposed at two ends of said outer mounting plate (602), a first electromagnetic coil (3a) and a second electromagnetic coil (3b) being respectively and correspondingly disposed on ribs (202) at two sides of said cylinder body (2).
3. The permanent magnet linear piston pump according to claim 1, wherein one set of permanent magnet assembly (6) is arranged at each side surface of said cylinder body (2).
4. The permanent magnet linear piston pump according to claim 1, wherein ribs (202) are disposed on edges of said cylinder body (2), said ribs (202) constructing said coil supporting member, said inner mounting plate (601) and said inner magnetic body (603) being disposed in a recess between said ribs (202) at two sides of a same side surface of said cylinder body (2).
5. The permanent magnet linear piston pump according to claim 1, wherein said cylinder body (2) includes a barrel unit and lids at two ends thereof, sealing rings being respectively disposed between said lids at said two ends and two end faces of said barrel unit, said barrel unit and said lids at said two ends being connected with each other by a plurality of axial shanks and nuts around an outer periphery of said barrel unit, said shanks constructing said coil supporting member.
6. The permanent magnet linear piston pump according to claim 1, wherein said cylinder body (2) is a prism having four to six sides.
7. The permanent magnet linear piston pump according to claim 1, wherein said cylinder body (2) is a quadrangular prism, a cross-section of which is in a rectangular shape.
8. The permanent magnet linear piston pump according to claim 1, wherein said inner mounting plate (601) and said outer mounting plate (602) are made of a permeability magnetic material, a magnetizing coil (7) being sleeved on said inner mounting plate (601) or/and said outer mounting plate (602), a magnetic field line created by said magnetizing coil (7) being formed in a closed annular shape along said inner mounting plate (601), said inner magnetic body (603), said outer magnetic body (604) and said outer mounting plate (602).
Type: Application
Filed: Oct 15, 2012
Publication Date: May 7, 2015
Inventor: Ronglan Xu (Yongjia County)
Application Number: 14/389,651
International Classification: F04B 17/04 (20060101); F04B 53/14 (20060101);