JP4206248B2 - Electromagnetic pump - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electromagnetic pump, and more particularly to a compact electromagnetic pump used for transporting a fluid such as gas or liquid.
[0002]
[Prior art]
A gas or liquid pumping action can be achieved by arranging a piston in a reciprocating manner in the cylinder chamber, communicating the cylinder chamber with the outside via an intake / exhaust valve, and reciprocating the piston. As a device using such a pump action, a piston is reciprocated by attaching a magnet to a piston arranged in the cylinder, arranging an electromagnetic coil on the outer periphery of the cylinder, and applying an electromagnetic force of the electromagnetic coil to the piston. There has been proposed a device (see Patent Document 1) configured to be configured, and a pump device (refer to Patent Document 2) having a structure in which a cylinder has a double pipe structure and the cylinders are opposed to each other and joined in two stages.
[0003]
[Patent Document 1]
Japanese Utility Model Publication No. 7-4875 [Patent Document 2]
JP-A-6-159232 [0004]
[Problems to be solved by the invention]
In the conventional device that reciprocates the piston disposed in the cylinder chamber by applying electromagnetic force from the outside of the cylinder chamber, the cylinder is provided in an elongated shape in the axial direction, and the piston is moved by a relatively large stroke to suck and discharge Has been. Therefore, when a small and thin pump device is required, such as when cooling a small electronic device such as a notebook personal computer, it is difficult to make it compact depending on the configuration of the conventional pump device. There was a problem. Further, since the piston is reciprocated, vibration and sound are likely to be generated during driving, and there has been a problem that electronic devices and the like are required to reduce vibration and reduce noise.
[0005]
The present invention has been made to solve these problems, and an object of the present invention is to efficiently reduce the size and thickness of the apparatus, reduce vibration during driving, and perform electronic devices and the like. It is in providing the electromagnetic pump which can be suitably mounted in.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention comprises the following arrangement.
That is, a mover having a magnetic body is provided in a cylinder whose both end faces are closed by a pair of frame bodies so as to be slidable between the end faces of each of the frame bodies as a pump chamber. An electromagnetic pump that arranges an air-core electromagnetic coil in the cylinder and transports fluid by energizing the electromagnetic coil and reciprocatingly driving the mover in the axial direction of the cylinder. An intake valve and a delivery valve that communicate between the pump chamber and the outside are provided, and the mover is formed by sandwiching a magnet magnetized in the axial direction of the cylinder by a pair of inner yokes, The inner yoke is provided with a short cylindrical flange portion slidably in contact with the inner surface of the cylinder at the peripheral portion of the flat plate portion sandwiching the magnet, facing the electromagnetic coil, Serial and suction valve and delivery valve, characterized in that the are disposed within a recess formed on the inner side of the flange portion of the inner yoke.
[0007]
Further, the frame body is made of a nonmagnetic material .
Also, the magnetized magnet in the axial direction of the cylinder units mover is formed by sandwiching a pair of inner yokes, provided plurality connected in the axial direction the unit mover via a non-magnetic material It is characterized by .
Also, the outer peripheral surface of the magnet sandwiched by the inner yoke, characterized in that it is sealed by a sealing member made of a nonmagnetic material.
In addition, the outer diameter of the sealing material is smaller than the outer diameter of the inner yoke .
Also, the outer periphery of said electromagnetic coil, wherein the outer yoke is provided made of a soft magnetic material surrounding the electromagnetic coil.
Also, the length of the electromagnetic coil in the axial direction of the cylinder is longer than the movable range of the inner yoke in the pump chamber.
In addition, a damper is provided on the end surface of the frame body to reduce an impact when the mover contacts the end surface of the frame body.
In addition, a damper is provided on a surface of the movable element that faces the end surface of the frame body, and a damper that reduces an impact when the movable element comes into contact with the end surface of the frame body is provided.
[0008]
Further, the suction passage of the pump chamber provided on one surface side of the mover and the suction passage of the pump chamber provided on the other surface side of the mover are provided in communication with each other. A pumping chamber flow passage provided on one side of the mover and a pumping passage flow passage provided on the other surface of the mover are provided in communication with each other. It is characterized by.
Also, a suction passage for the pump chamber provided on one surface side of the mover is provided in communication with a delivery passage for the pump chamber provided on the other surface side of the mover . It is characterized by that.
Further, a sensor for detecting a moving position of the movable element is provided, and the movable element is driven and controlled based on a detection signal of the sensor.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view showing a configuration of an electromagnetic pump according to the present invention.
In the electromagnetic pump of this embodiment, a mover having a magnet (permanent magnet) is slidably disposed in the cylinder axial direction in a cylindrical cylinder, and the electromagnetic force of an electromagnetic coil disposed on the outer periphery of the cylinder. Is made to act on the movable element, and the movable element is reciprocated to perform a pumping action.
[0010]
In FIG. 1, reference numeral 10 denotes a mover arranged so as to be able to reciprocate in the axial direction of the cylinder.
The mover 10 includes a magnet 12 formed in a disc shape and a pair of inner yokes 14a and 14b that sandwich the magnet 12 in the thickness direction. The magnet 12 is a permanent magnet that is magnetized in the thickness direction with one surface being an N pole and the other surface being an S pole. The inner yokes 14a and 14b are formed of a soft magnetic material, and each inner yoke 14a and 14b stands in a short cylindrical shape at a flat plate portion 15a formed to have a slightly larger diameter than the magnet 12 and a peripheral portion of the flat plate portion 15a. Flange portion 15b.
[0011]
Reference numeral 16 denotes a sealing material made of a nonmagnetic material such as plastic covering the outer peripheral side surface of the magnet 12. The sealing material 16 has a function of covering the magnet 12 so that the magnet 12 is not exposed to the outside so as not to rust, and a function of integrally forming the magnet 12 and the inner yokes 14a and 14b. The sealing material 16 is provided so as to fill the outer peripheral side surface of the magnet 12 sandwiched between the inner yokes 14a and 14b. The outer peripheral diameter of the sealing material 16 is slightly smaller than the outer peripheral diameter of the inner yokes 14a and 14b. Is formed. When the sealing material 16 is formed in this way, when the outer peripheral surfaces of the inner yokes 14a and 14b are finish-ground, the sealing material 16 does not come into contact with the grinding blade and can be operated without damaging the grinding blade. When the pump is used at a high temperature when the thermal expansion coefficient of the sealing material 16 is larger than that of the inner yokes 14a and 14b, the gap between the mover 10 and the cylinder is the heat of the sealing material 16. There is an advantage that it is possible to prevent the pump from being reduced or eliminated by the expansion and to operate the pump stably.
[0012]
FIG. 2 shows a perspective view of a state in which the magnet 12 is sandwiched between the inner yokes 14a and 14b and integrally formed with the sealing material 16, and the movable element 10 is formed into a cylindrical body. Since the inner yokes 14 a and 14 b are formed by raising the flange portion 15 b at the peripheral portion, the concave portions 10 a are formed on both end surfaces in the axial direction of the mover 10. The electromagnetic pump of this embodiment can be formed thin by providing the concave portions 10a on both end faces of the mover 10, and the reciprocating operation of the mover 10 can be accurately performed by the action of the flange portion 15b. It becomes possible to make it.
[0013]
Although the mover 10 reciprocates in the cylinder, in this embodiment, a pair of frames are combined to form a cylindrical cylinder, and the mover 10 is arranged in this cylinder.
In FIG. 1, 20a and 20b are a pair of frame bodies made of a non-magnetic material forming a cylinder, 20a is an upper frame, and 20b is a lower frame. In the present embodiment, the cylindrical body portion 24 formed in a cylindrical shape is extended from the main body 22b of the lower frame 20b, and the end of the cylindrical body portion 24 is formed in the fitting groove 28 provided in the main body 22a of the upper frame 20a. The cylinder which accommodates the needle | mover 10 by making it fit is comprised. A sealing material 29 is provided at a portion of the fitting groove 28 where the end surface of the cylindrical body portion 24 abuts. The end surface of the cylindrical body portion 24 abuts against the sealing material 29 to seal the inside of the cylinder from the outside. . In addition, the cylindrical body part 24 can be extended from the upper frame 20a and can be fitted to the lower frame 20b. Further, the cylindrical portion 24 may be formed separately from the upper frame 20a and the lower frame 20b.
[0014]
Thus, both end surfaces of the cylinder formed by combining the upper frame 20a and the lower frame 20b are closed by the main body 22a of the upper frame 20a and the main body 22b of the lower frame 20b, and pumps are respectively connected to both end surfaces of the mover 10. Chambers 30a and 30b are formed.
The movable element 10 slides in a state of being in air-tight or liquid-tight seal with the cylindrical body portion 24 while being in contact with the inner surface of the cylindrical body portion 24. In order to improve the slidability of the mover 10, the outer yokes 14a and 14b are provided with a coating having both lubricity and rust prevention such as fluororesin coating and DLC (diamond-like carbon) coating. Further, it is possible to provide a detent that prevents the mover 10 from rotating in the circumferential direction.
[0015]
The pump chambers 30a and 30b correspond to gap portions formed between both end faces of the mover 10 and the main body 22a of the upper frame 20a and the main body 22b of the lower frame 20b.
In the present embodiment, the main body 22a of the upper frame 20a is formed so as to protrude into a recess 10a formed on one end face of the mover 10, and similarly, the main body 22b of the lower frame 20b is formed on the other end of the mover 10. The pump chambers 30a and 30b are formed in a space bent in a cross-sectional shape so as to protrude into the recess 10a formed on the end face.
[0016]
Reference numeral 32 denotes a damper attached to the end surfaces of the main bodies 22a and 22b. The damper 32 is provided to absorb an impact when the inner yokes 14a and 14b come into contact with the end surfaces of the main bodies 22a and 22b at the terminal position of the movable range of the movable element 10. In addition, you may provide a damper in the surface which contact | abuts to main body 22a, 22b by the end surface of inner yoke 14a, 14b instead of providing in the end surface of main body 22a, 22b.
[0017]
34a is a suction valve provided in the main body 22a of the upper frame 20a in communication with the pump chamber 30a, and 36a is a delivery valve provided in the main body 22a in communication with the pump chamber 30a. Reference numeral 34b denotes a suction valve provided in the main body 22b of the lower frame 20b in communication with the pump chamber 30b. Reference numeral 36b denotes a delivery valve provided in the main body 22b in communication with the pump chamber 30b.
In the present embodiment, the suction valves 34a, 34b and the delivery valve are provided by providing the suction valves 34a, 34b and the delivery valves 36a, 36b inside the main bodies 22a, 22b protruding into the recess 10a of the mover 10. 36a and 36b are accommodated within the length range of the cylinder to reduce the thickness of the pump device.
[0018]
Reference numerals 38a and 38b denote suction channels provided in the upper frame 20a and the lower frame 20b in communication with the suction valves 34a and 34b. Reference numerals 40a and 40b denote delivery channels provided in the upper frame 20a and the lower frame 20b in communication with the delivery valves 36a and 36b.
42 is a communication pipe that connects the suction flow path 38a of the upper frame 20a and the suction flow path 38b of the lower frame 20b, and 44 is a delivery flow path 40a of the upper frame 20a and a delivery flow path 40b of the lower frame 20b. It is a communication pipe that communicates. As a result, the suction channel and the delivery channel of the upper frame 20a and the lower frame 20b communicate with one suction port 38 and the delivery port 40, respectively. As shown in FIG. 4, the communication pipes 42 and 44 are formed as through holes in the outer yoke 52 so that the suction flow path and the discharge flow path communicate with each other through the through holes. Good.
[0019]
In FIG. 1, 50a and 50b are air core electromagnetic coils arranged so as to surround the outer periphery of the cylinder portion 24, that is, the cylinder. The electromagnetic coils 50a and 50b are slightly spaced apart from each other in the axial direction of the cylinder, and are arranged at equal positions with respect to the center position in the axial direction of the cylinder. The electromagnetic coils 50a and 50b are set to have a longer axial length than the movable range of the flange portion 15b of the inner yokes 14a and 14b.
Note that the winding directions of the electromagnetic coil 50a and the electromagnetic coil 50b are opposite to each other, and currents in opposite directions flow when energized by the same power source. The winding direction of the electromagnetic coils 50a and 50b is reversed because the force acting on the current flowing through the electromagnetic coils 50a and 50b interlinked with the magnetic flux of the magnet 12 is superimposed on the mover 10 as a reaction force. This is because this force acts and this force becomes a thrust.
[0020]
Reference numeral 52 denotes an outer yoke made of a soft magnetic material and formed in a cylindrical shape surrounding the outer periphery of the electromagnetic coils 50a and 50b. By enclosing the outer periphery of the electromagnetic coils 50 a and 50 b with the outer yoke 52, the electromagnetic force can be effectively applied to the mover 10.
Providing the flange portion 15b upright on the periphery of the inner yokes 14a, 14b constituting the mover 10 also reduces the resistance of the magnetic circuit of the magnet 12 and increases the total amount of magnetic flux generated by the magnet 12. This is because the magnetic flux generated by the magnet 12 is linked to the current flowing through the electromagnetic coils 50a and 50b at right angles to the axial direction, thereby effectively generating axial thrust. Further, since the mover 10 according to this configuration has a lighter mass than the generated thrust, a high-speed response is possible and the output flow rate can be increased.
[0021]
When combining the upper frame 20a and the lower frame 20b, the electromagnetic coils 50a, 50b and the outer yoke 52 are fitted to the outer yoke 52 in the fitting groove 28 provided in the upper frame 20a and the lower frame 20b. It can be assembled concentrically with the cylindrical part 24). FIG. 2 shows the arrangement of the mover 10, the electromagnetic coils 50 a and 50 b, and the outer yoke 52.
[0022]
The mover 10 is reciprocally driven (moved up and down) by the action of electromagnetic force generated by the electromagnetic coils 50a and 50b by applying an alternating current to the electromagnetic coils 50a and 50b. The electromagnetic force generated by the electromagnetic coils 50a and 50b pushes the mover 10 in one direction and the other depending on the direction of energization of the electromagnetic coils 50a and 50b. Therefore, the controller controls the energization time and energization of the electromagnetic coils 50a and 50b. By controlling the direction, the mover 10 can be reciprocated with an appropriate stroke. By causing the mover 10 to reciprocate so that the end faces of the inner yokes 14a and 14b of the mover 10 do not collide with the end faces of the main body 22a of the upper frame 20a and the main body 22b of the lower frame 20b, generation of vibrations of the apparatus can be suppressed. . When the movable element 10 contacts the inner surfaces of the main bodies 22a and 22b, the shock can be absorbed by the action of the damper 32.
[0023]
A sensor for detecting the moving position of the mover 10 in the cylinder may be provided, and the reciprocation of the mover 10 may be controlled based on a detection signal from the sensor. As a method of detecting the moving position of the mover 10, a method of providing a magnetic detection sensor for detecting the moving position of the mover 10 outside the cylinder, a pressure-sensitive sensor provided in the damper 32, and For example, a method of detecting the contact point is possible. In the electromagnetic pump of the present embodiment, the moving stroke of the mover 10 is relatively small, but the pump chambers 30a and 30b can secure a relatively large area. It is possible to secure a flow rate.
[0024]
The pumping action of the electromagnetic pump of the present embodiment is achieved by the action of the fluid being alternately sucked into the pump chambers 30a and 30b and sent out by reciprocating the mover 10 by the electromagnetic coils 50a and 50b.
That is, when the mover 10 moves downward in the state of FIG. 1, the fluid is introduced into one pump chamber 30a, and at the same time, the fluid is delivered from the other pump chamber 30b. Conversely, when the mover 10 moves upward, the fluid is sent out from one pump chamber 30a, and the fluid is introduced into the other pump chamber 30b. Thus, the fluid is sucked and discharged when the mover 10 moves to either side, and the fluid pulsation can be suppressed and the fluid can be transported efficiently.
[0025]
In the electromagnetic pump of this embodiment, inner yokes 14a and 14b having flange portions 15b are attached to the mover 10, and suction valves 34a and 34b and delivery valves 36a and 36b are provided close to both end faces of the mover 10. By providing this, it has become possible to provide an extremely thin and compact pump. In the case of the electromagnetic pump of the embodiment, it can be formed into a small pump having a height of about 15 mm and a width of about 20 mm.
[0026]
Moreover, the electromagnetic pump of this embodiment can be used for transport of gas or liquid, and the kind of fluid is not limited. When a single movable element 10 is used as a liquid pump and the transport pressure is insufficient, as shown in FIG. 3, a plurality of identical unit movable elements composed of a magnet 12 and inner yokes 14a and 14b are provided. A multi-stage movable element 10 connected to each other may be used. A nonmagnetic material 54 is disposed between the adjacent inner yokes 14a and 14b. The direction of the magnetic poles of the magnet 12 is aligned in one direction, and the electromagnetic coils 50a and 50b having the windings reversed in the same manner as in the above-described embodiment are arranged for each unit mover. An outer yoke 52 is provided so as to surround the outer circumferences of all the electromagnetic coils 50a and 50b. By connecting the unit movers in multiple stages, a mover having a large thrust can be obtained, and an electromagnetic pump having a required transport pressure can be obtained.
[0027]
In the above embodiment, the inner yokes 14a and 14b attached to the mover 10 are provided with the flange portion 15b. However, the inner yokes 14a and 14b are not provided with the flange portion 15b, and the inner yokes 14a and 14b are provided. It is also possible to form a single plate. In this case, since the mass of the mover 10 is increased, the high-speed response is deteriorated and the thinning of the pump device is somewhat hindered, but the structure is simplified and the productivity can be improved and the production cost can be reduced. .
[0028]
Moreover, in the said embodiment, although the magnet 12 was attached to the needle | mover 10 and it was set as the structure which clamped the magnet 12 with the inner yokes 14a and 14b, the needle | mover 10 does not necessarily need to be provided with the magnet 12. FIG. . When the mover 10 is formed of a magnetic material and the mover 10 is in a position displaced with respect to one of the electromagnetic coils 50a and 50b, only one of the electromagnetic coils is energized to move the mover 10 in the axial direction. When the other electromagnetic coil is moved to the deviated position, the other electromagnetic coil is energized, and the energization to one electromagnetic coil is stopped, so that the mover can be moved in the opposite direction again. As described above, the movable element 10 can be reciprocated in the axial direction by ON-OFF control of energization of the pair of electromagnetic coils.
[0029]
In addition, the electromagnetic pump shown in FIG. 1 communicates the suction flow paths 38a and 38b provided on one side and the other side of the mover 10 and sends it on one side and the other side of the mover 10. In this example, the flow paths 40a and 40b are communicated, that is, the flow paths are communicated in parallel, but a plurality of electromagnetic pumps may be used in series with the flow paths. In this case, the delivery channel 40a may be communicated with the suction channel 38b, or the delivery channel 40b may be communicated with the suction channel 38a.
[0030]
【The invention's effect】
As described above, the electromagnetic pump according to the present invention can be formed extremely small and thin as a pump device that performs a gas or liquid pumping operation, and can perform an accurate pumping operation, thereby cooling the electronic device. As a result, it is possible to suitably use it.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a configuration of an electromagnetic pump according to the present invention.
FIG. 2 is a perspective view showing a configuration of a mover of an electromagnetic pump.
FIG. 3 is a cross-sectional view showing a configuration of a mover formed in a multistage type.
FIG. 4 is an explanatory diagram illustrating an example in which a through hole is provided in the outer yoke to form a communication pipe.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Movable element 10a Recess 12 Magnet 14a, 14b Inner yoke 15b Flange part 16 Sealing material 20a Upper frame 20b Lower frame 22a, 22b Main body 24 Cylinder part 29 Sealing material 30a, 30b Pump chamber 32 Damper 34a, 34b Suction valve 36a 36b Delivery valves 38a, 38b Suction channels 40a, 40b Delivery channels 42, 44 Communication pipes 50a, 50b Electromagnetic coil 52 Outer yoke

Claims (12)

A mover provided with a magnetic body is provided in a cylinder whose both end faces are closed by a pair of frame bodies so as to be slidable between the end faces of each of the frame bodies as a pump chamber. An electromagnetic pump that arranges a core electromagnetic coil, transports fluid by energizing the electromagnetic coil and reciprocatingly driving the mover in the axial direction of the cylinder,
In the end face region of the cylinder of the frame body, a suction valve and a delivery valve that communicate the pump chamber and the outside are provided,
The mover is formed by sandwiching a magnet magnetized in the axial direction of the cylinder by a pair of inner yokes,
The inner yoke is provided with a short cylindrical flange portion slidably in contact with the inner surface of the cylinder at the peripheral portion of the flat plate portion sandwiching the magnet, facing the electromagnetic coil,
The electromagnetic pump according to claim 1, wherein the suction valve and the delivery valve are disposed in a recess formed inside the flange portion of the inner yoke.   The electromagnetic pump according to claim 1, wherein the frame body is made of a nonmagnetic material.   A unit movable element is formed by sandwiching a magnet magnetized in the axial direction of the cylinder between a pair of inner yokes, and a plurality of the unit movable elements are connected in the axial direction via a nonmagnetic material. The electromagnetic pump according to claim 1 or 2.   The electromagnetic pump according to any one of claims 1 to 3, wherein an outer peripheral surface of the magnet sandwiched between the inner yokes is sealed with a sealing material made of a nonmagnetic material. The electromagnetic pump according to claim 4 , wherein an outer peripheral diameter of the sealing material is smaller than an outer peripheral diameter of the inner yoke.   The electromagnetic pump according to any one of claims 1 to 5, wherein an outer yoke made of a soft magnetic material surrounding the electromagnetic coil is provided on an outer periphery of the electromagnetic coil.   The electromagnetic pump according to any one of claims 1 to 6, wherein the length of the electromagnetic coil in the axial direction of the cylinder is longer than the movable range of the inner yoke in the pump chamber.   The electromagnetic pump according to any one of claims 1 to 7, wherein a damper is provided on an end surface of the frame body to reduce a shock when the mover contacts the end surface of the frame body. .   9. The damper according to claim 1, wherein a damper is provided on a surface of the movable element facing the end surface of the frame body to reduce an impact when the movable element comes into contact with the end surface of the frame body. An electromagnetic pump according to claim 1.   A suction passage for a pump chamber provided on one surface side of the mover and a suction passage for a pump chamber provided on the other surface side of the mover are provided in communication with each other. A pumping channel for the pump chamber provided on one surface side of the child and a pumping channel for the pump chamber provided on the other surface side of the mover are provided in communication with each other. The electromagnetic pump according to any one of claims 1 to 9. The suction passage of the pump chamber provided on one surface side of the mover is provided in communication with the delivery passage of the pump chamber provided on the other surface side of the mover. The electromagnetic pump according to any one of claims 1 to 9 , wherein the electromagnetic pump is characterized.   The electromagnetic pump according to claim 1, wherein a sensor for detecting a moving position of the mover is provided, and the mover is driven and controlled based on a detection signal of the sensor.

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