JP2000299971A - Electromagnetic drive mechanism and electromagnetic vibration pump using the same - Google Patents

Abstract

(57) [Problem] To provide an electromagnetic drive mechanism capable of improving the thrust of a movable member. SOLUTION: An electromagnet 1 arranged so that a magnetic pole portion faces each other.
And a permanent magnet 33 disposed in the gap 2 between the electromagnets 1
The movable member 3 includes a movable member 3 based on a magnetic interaction between the electromagnet 1 and the permanent magnet 33.
An electromagnetic drive mechanism A for vibrating the electromagnet 1
Are formed on the outer yoke portion 22 and both pole portions of the outer yoke portion 22 and four pole portions 23, 2 disposed between the both end portions.
4 and a pair of winding coils 21 respectively incorporated in a pair of center poles 23 at the center, wherein the movable members 3 are arranged at predetermined intervals, and each has a pair of permanent magnets 33. Mover 30 and elastic member 31 interposed between movers 30
Consists of

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electromagnetic drive mechanism and an electromagnetic vibration pump using the same. More specifically, the present invention relates to an active electromagnetic drive mechanism capable of improving the thrust of attraction and repulsion of a pair of movers disposed between electromagnets, and an electromagnetic vibration pump using the mechanism.

[0002]

2. Description of the Related Art Conventionally, electromagnetic vibration type pumps have been used mainly for supplying oxygen to fish tanks for fish farming and household septic tanks, or for sampling inspection gases in pollution monitoring. Further, such a pump can also be used as a vacuum pump. For example, a pair of annular electromagnets arranged at a predetermined interval in a casing, and a pair of movable members each having a pump chamber formed in a central portion between the electromagnets and opposed to each other in the electromagnets (Piston) and a return spring interposed between the outer end surfaces of the pair of movable members and the casing. This pump has excellent low-vibration characteristics because the pair of movable members reciprocate in opposite directions to cancel the vibration acting on the casing.

[0003]

However, in such a pump, since the movable member is a magnetic material, a half-wave current is supplied to the coil of the electromagnet to move the movable member toward the return spring (rebound direction). Thereafter, the movable member is moved toward the pump chamber (in the suction direction) by the restoring force accumulated in the return spring. For this reason, a difference tends to occur in the thrust (power factor) in the repulsion direction and the suction direction.

[0004] In view of the above circumstances, an object of the present invention is to provide an electromagnetic drive mechanism capable of improving the thrust of a movable member and an electromagnetic vibration pump using the mechanism.

[0005]

According to the present invention, there is provided an electromagnetic drive mechanism comprising: an electromagnet having magnetic pole portions opposed to each other; and a movable member having a permanent magnet disposed in a gap between the electromagnets. An electromagnetic drive mechanism that vibrates the movable member based on a magnetic interaction between an electromagnet and a permanent magnet, wherein the electromagnet includes an outer yoke, and both ends of the outer yoke and a portion between the both ends. And a winding coil respectively incorporated in a pair of center poles at the center, wherein the movable members are arranged at a predetermined distance from each other, and the permanent magnets are respectively disposed. And a resilient member interposed between the movers.

Further, an electromagnetic vibration type pump according to the present invention includes an electromagnetic drive mechanism, a diaphragm connected to both outer ends of the mover, and a pump casing having pump chambers at both ends of the electromagnetic drive mechanism. It is characterized by the following.

Further, the electromagnetic vibration type pump according to the present invention includes a pump casing having a pump chamber at both ends of the electromagnetic drive mechanism, and a piston formed on the movable member of the electromagnetic drive mechanism in the pump chamber. A cylinder portion having a discharge hole and a discharge valve, which is engaged with the portion, is formed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an electromagnetic drive mechanism and an electromagnetic vibration pump using the same according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a longitudinal sectional view showing an electromagnetic vibration type pump using an electromagnetic drive mechanism according to an embodiment of the present invention.
2 is a cross-sectional view taken along the line II in FIG. 1, FIG. 3 is an exploded perspective view of the mover and the coil spring in FIG. 1, and FIG. 4 is an exploded perspective view of the mover and the coil spring according to another embodiment. 5 is a view for explaining the operation of the electromagnetic vibration type pump in FIG. 1, FIG. 6 is a longitudinal sectional view showing an electromagnetic vibration type pump using an electromagnetic drive mechanism according to another embodiment of the present invention, and FIG. A longitudinal sectional view showing an electromagnetic vibration type pump using an electromagnetic drive mechanism according to still another embodiment of the present invention,
8 is a cross-sectional view taken along the line II-II in FIG. 7, FIG. 9 is a cross-sectional view of an electromagnetic vibration type pump using an electromagnetic drive mechanism according to still another embodiment of the present invention, and FIG. FIG. 11 is a cross-sectional view of an electromagnetic vibration type pump using an electromagnetic drive mechanism according to an embodiment of the present invention. FIG. 11 is a longitudinal sectional view showing an electromagnetic vibration type pump using an electromagnetic drive mechanism according to still another embodiment of the present invention. FIG.
FIG. 13 is a perspective view showing an iron core related to a further electromagnetic drive mechanism of the present invention. FIG. 14 is a perspective view showing an electromagnet related to a further electromagnetic drive mechanism of the present invention.
5 is a longitudinal sectional view of the electromagnet in FIG. 14, and FIG.
It is explanatory drawing which shows the assembly procedure of an electromagnet in.

As shown in FIGS. 1 to 3, the electromagnetic vibration type pump according to one embodiment of the present invention is an active diaphragm type pump, which comprises two electromagnets 1 arranged opposite to each other. An electromagnetic drive mechanism A comprising a movable member 3 disposed in a gap 2 between the electromagnets 1, and a diaphragm 6 connected to a bolt 4 using a nut 5 at both outer ends of the movable member 3. And a pump casing 10 having a pump chamber 9 including a suction chamber 7 and a discharge chamber 8 at both ends of the electromagnetic drive mechanism A. A cover 11 is covered on the outer periphery of the pump casing 10. The electromagnetic drive mechanism A and the pump casing 10
Are assembled with bolts 12 and nuts (not shown) inserted into the four corners.

The suction chamber 7 in the pump casing 10 has a suction hole 13 and a suction valve 14, and the discharge chamber 8 has a discharge hole 1
5 and a discharge valve 16 respectively. The suction chamber 7 has a fluid passage 17 formed in the pump casing 10 and communicates with the suction port 13. The discharge chamber 8 communicates with the discharge nozzle 18 and the opening 19 of the cover 11.

The electromagnet 1 comprises a comb-shaped iron core 20 and a winding coil 21. The iron core 20 includes an outer yoke portion 22, both end portions of the outer yoke portion 22, and four pole portions 23 and 24 disposed between the both end portions, and a center disposed between the both end portions. The coil portions 21 wound around the bobbins 25 are incorporated in the pole portions 24, respectively. The iron core 20 includes upper and lower outer frames 2 among four outer frames 26 surrounding the electromagnet 1 in a box shape.
The engaging projection 27 formed on the outer yoke portion 22 is fitted into the opening 26a of the sixth and fixed by caulking or welding. As described above, since the movable member 3 is surrounded by the four outer frames 26, the vibration noise inside the pump hardly leaks to the outside, and the sound insulation effect can be enhanced.

A flat bearing 28 made of 66 nylon or the like is attached to the bobbin 25 between the magnetic pole portions of the center pole portion 24. The flat bearing 28 can support the inside of the movable member 3 and facilitates attachment of an elastic member 31 described later. Further, two plates 29 having different sizes of openings are provided between the magnetic pole portions of the side pole portion 23 and the center pole portion 24.
A magnetic wedge member 29 in which a and 29b are integrally molded with the bobbin 25 is fitted. By adjusting the extension of the step portion in the magnetic wedge portion 29,
The area of the gap with the permanent magnet 33 described later can be adjusted.
Thereby, the reactance of the winding coil 21 can be adjusted, and the current value to the winding coil 21 can be suppressed.

In the present embodiment, the iron core is formed by laminating a plurality of stator cores formed of an iron plate such as a silicon steel plate (electric iron plate) of a soft magnetic iron plate or an ordinary iron plate. However, the present invention is not limited to this. For example, the outer yoke portion and the side pole portion may be formed from a soft magnetic iron plate, and the center pole portion of the soft magnetic iron plate may be assembled thereto. Further, in the present embodiment, the iron core is fixed to the outer frame made of a non-magnetic material, but the iron core may be fixed to the outer frame made of a magnetic material. When such an iron core is fixed to the outer frame made of a magnetic material, it is preferable to form slits on both sides of the iron core along the longitudinal direction on the outer frame so that magnetic flux does not leak from both sides of the iron core.

The movable member 3 includes a pair of movable members 30 having a rectangular cross section disposed at a predetermined distance from each other, and an elastic member 3 such as a coil spring interposed between the movable members 30.
In the pair of movers 30, a flat permanent magnet 33 is fitted into a rectangular opening 32, respectively. As the permanent magnet 33, a ferrite magnet, a rare earth magnet, or the like can be used, and the arrangement is such that polarities (N pole and S pole) repel each other. The elastic member 31 has both ends at the movable element 30.
Is inserted into a concave portion 35 formed in the central rod 34 of FIG.

In this embodiment, one elastic member is interposed between the pair of movers. For example, as shown in FIG. 4, two elastic members are formed on the end surfaces of the pair of movers 36. It is also possible to interpose two elastic members 38 inserted into the three concave portions 37, respectively.

In this embodiment, as shown in FIGS. 5 (a) and 5 (b), the polarity (N pole and S pole) of the permanent magnet 33
An alternating current is applied to each winding coil 21 so that the same polarity is generated from different polarities. As shown in FIG. 5A, a magnetic path Ma is formed between the pair of permanent magnets 33 and each of the center pole portions 24 by such an alternating current, and the pair of movable elements 30 move in the direction of arrow Fa. Move so that they are attracted to each other. Next, as shown in FIG. 5B, a magnetic path Mb is formed between the pair of permanent magnets 33 and each of the side pole portions 23 so that the pair of movers 30 repel each other in the direction of arrow Fb. Go to Thereby, based on the magnetic interaction between the electromagnet 1 and the permanent magnet 33, the pair of movers 30 repeatedly move in opposite directions to each other, whereby the diaphragm 6 connected to the mover 30 (see FIG. 1). Is vibrated, and the fluid inside the vacuum chamber, for example, is sucked from a suction port (not shown) and then discharged through the discharge nozzle 18.

Next, another embodiment of the present invention will be described. Although the electromagnetic vibration type pump in the above embodiment is an active diaphragm type pump, in this embodiment, it is an active type piston type pump. That is, as shown in FIG. 6, a pump casing 40 having an electromagnetic drive mechanism A and a pump chamber 9 including a suction chamber 7 and a discharge chamber 8 at both ends of the electromagnetic drive mechanism A.
It is composed of

The mover 30 of the electromagnetic drive mechanism A is provided with a piston portion 42 having a suction hole 13, a suction valve 14, and a fluid passage 41. On the other hand, the pump casing 40 is formed with a cylinder portion 43 that engages with the piston portion 41. The cylinder portion 43 is provided with a discharge hole 44 and a discharge valve 4 locked by a projection 45 formed on the outer periphery.
6. Thereby, the external fluid is supplied to the suction chamber 7.
In addition, the liquid can be discharged from the discharge nozzle 18 via the discharge chamber 8.

Next, still another embodiment of the present invention will be described. As shown in FIGS. 7 and 8, the electromagnetic drive mechanism B in the present embodiment is different from the electromagnetic drive mechanism A in the above embodiment. That is, the electromagnetic drive mechanism B
Is provided with four (two pairs) of electromagnets 1 arranged to face each other in four outer frames 26 and permanent magnets 50 arranged at predetermined intervals in a gap 2 between the electromagnets 1. And a pair of movers 51 and an elastic member 31 such as a coil spring interposed between the movers 51. The permanent magnet 50 is fitted into the rod 52 of the mover 51, and is held by the step portion 53 and the collar 54. The outer diameter of the permanent magnet 50 is square (square prism type). Then, one of the pair of permanent magnets 50, for example, the permanent magnet 53 on the left side of FIG. 7 is magnetized to polar anisotropic magnetic poles at four locations in the circumferential direction alternately with N and S poles. The polarities of the S pole and the N pole are alternately changed at four locations in the circumferential direction opposite to the left permanent magnet 53 where the polarity of the other permanent magnet (the right permanent magnet in FIG. 7) 53 is opposite. It is magnetized. Therefore, since the magnetic path is formed three-dimensionally between the adjacent iron cores 20, the thrust is improved and the size can be reduced.

In this embodiment, four electromagnets 1 are used.
In the present invention, the winding coils 21 are respectively attached to the iron cores 20 of the pair of electromagnets 1. However, the present invention is not limited to this. For example, as shown in FIG. 21 can also be assembled. By halving the number of winding coils in this way, production costs can be reduced.

Further, in this embodiment, the permanent magnet is of a prismatic type having a square outer shape, but in the present invention, as shown in FIG. Inner surface 5 of the magnetic pole portion 55
6 may be an arc shape and a cylindrical permanent magnet 57 having a circular outer shape.

The prism type permanent magnet 53 or FIG.
As shown in FIG. 1, when the cylindrical permanent magnet 57 is used for an active piston pump, the piston 41 may rotate in the circumferential direction during operation.
As shown in FIG. 12, it is preferable that the outer diameter shape of the piston portion 41 and the inner diameter shape of the cylinder portion 43 have a shape such as a polygon, for example, a substantially elliptical shape which is easy to process. Thereby, in the prismatic permanent magnet, the permanent magnet does not rotate, and the contact between the permanent magnet and the magnetic pole portion of the iron core can be prevented. Further, in the case of a cylindrical permanent magnet, the permanent magnet does not rotate, and sliding wear between the piston and the cylinder can be prevented.

Next, a further embodiment of the present invention will be described. In the above embodiment, the iron core is fixed to the outer frame, but in the present embodiment, as shown in FIG. 13, the outer yoke portion 60a is a part of the outer frame 60, that is, the outer yoke portion 60a The side pole portion 61 is bent and formed from one electric iron plate outer frame 60 which also functions as the outer yoke portion 60a.
Is fixedly attached to the part. Then, between the side pole portion 61 and the center pole portion 62 on the outer frame 60, three auxiliary yokes 6 each having a U-shaped cross section so as to increase the cross-sectional area of the magnetic path and reduce the magnetic resistance.
It is preferable to attach 3 respectively. Further, since the outer frame 60 is an electric iron plate, it is preferable to form a slit 64 in the outer frame 60 along the longitudinal direction of the iron core.

In the present embodiment, the side pole portion is formed on the outer frame also serving as the outer yoke portion, and then the center pole portion is assembled. However, the present invention is not limited to this. For example, as shown in FIGS. 14 and 15, an outer yoke portion 71 and a side pole portion 72 formed of an electric iron plate are provided on an outer frame 70, and an auxiliary yoke 73 is provided on the outer yoke portion 71. An iron core 75 including a center pole portion 74 to be assembled with the iron core 75 can also be fixed. Figures 14 and 15
In the figure, 76 is a winding coil to be incorporated. As the outer frame 70, a magnetic electric iron plate or a nonmagnetic aluminum alloy or a synthetic resin can be used. When the outer frame 70 is a magnetic material, it is preferable to form a slit (not shown) along the iron core 75 as described above. The outer frame 7 shown in FIGS.
First, as shown in FIGS. 16A and 16B, the outer yoke portion 71 and the side pole portion 72 which are integrally formed on the outer frame 70 are fixed to each other. After that, as shown in FIG. 16C, the two left and right auxiliary yokes 73 are connected to the side poles 72.
Then, as shown in FIG. 16 (d), the auxiliary yoke portion 73 at the central portion is installed between the two left and right auxiliary yoke portions 73. Next, as shown in FIG. 16 (e), the winding coil 21 wound around the bobbin 25 is inserted into the side of the auxiliary yoke portion 73 and assembled, and finally the center pole portion 74 is inserted into the hole of the bobbin 25. Insert and fix.

In the above embodiments, the mover is provided with a permanent magnet. However, the present invention is not limited to this, and a soft magnetic material is provided on the mover instead of the permanent magnet. It can also be provided. When such a soft magnetic material is provided, an active pump can be obtained by supplying a half-wave current instead of an alternating current to the winding coil.

[0027]

As described above, according to the present invention,
Since it is an active type, vibrations at the time of suction (inward movement) and at the time of repulsion (outward movement) cancel each other, so that vibration and vibration noise can be reduced. This makes it easy to take measures against vibration.

Further, the permanent magnet causes the pair of movers to repeat attraction and repulsion, so that the thrust of the pair of movers can be improved, and at the time of rebound, the restoring force of the coil spring is applied synergistically. The compression pressure of the discharged fluid can be improved.

Further, since all the electromagnets can have the same structure, production costs such as mold costs and jig costs can be reduced.

Further, the frame can be miniaturized and a noise from the inside can be reduced by forming a fully-closed structure surrounding the pair of vibrators with a frame integrally fixed to the iron core or a frame also serving as an outer yoke portion of the iron core. Can be. Accordingly, it is not necessary to separately manufacture the soundproof cover, and the production cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an electromagnetic vibration type pump using an electromagnetic drive mechanism according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II in FIG.

FIG. 3 is an exploded perspective view of a mover and a coil spring in FIG.

FIG. 4 is an exploded perspective view of a mover and a coil spring according to another embodiment.

FIG. 5 is a view for explaining the operation of the electromagnetic vibration pump in FIG. 1;

FIG. 6 is a longitudinal sectional view showing an electromagnetic vibration type pump using an electromagnetic drive mechanism according to another embodiment of the present invention.

FIG. 7 is a longitudinal sectional view showing an electromagnetic vibration type pump using an electromagnetic drive mechanism according to still another embodiment of the present invention.

8 is a sectional view taken along line II-II in FIG.

FIG. 9 is a cross-sectional view of an electromagnetic vibration type pump using an electromagnetic drive mechanism according to still another embodiment of the present invention.

FIG. 10 is a cross-sectional view of an electromagnetic vibration pump using an electromagnetic drive mechanism according to still another embodiment of the present invention.

FIG. 11 is a longitudinal sectional view showing an electromagnetic vibration type pump using an electromagnetic drive mechanism according to still another embodiment of the present invention.

FIG. 12 is a sectional view taken along line III-III in FIG. 11;

FIG. 13 is a perspective view showing an iron core according to a further electromagnetic drive mechanism of the present invention.

FIG. 14 is a perspective view showing an electromagnet related to a further electromagnetic drive mechanism of the present invention.

15 is a longitudinal sectional view of the electromagnet in FIG.

FIG. 16 is an explanatory view showing a procedure for assembling the electromagnet in FIG. 14;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electromagnet 2 Air gap part 3 Movable member 6 Diaphragm 10 Pump casing 20 Iron core 21 Winding coil 22 Outer yoke part 23 Side pole part 24 Center pole part 25 Bobbin 26 Outer frame 30 Mover 31 Elastic member 33 Permanent magnet A, B Electromagnetic drive mechanism

Claims (13)

[Claims] 1. An electromagnet having a magnetic pole portion opposed thereto,
An electromagnetic drive mechanism that is arranged in a gap between the electromagnets and includes a movable member including a permanent magnet, and that vibrates the movable member based on a magnetic interaction between the electromagnet and the permanent magnet; From an outer yoke portion, a core formed of both ends of the outer yoke portion and four pole portions disposed between the both end portions, and winding coils respectively incorporated in a pair of center pole portions at the center. An electromagnetic drive mechanism, wherein the movable members are arranged at a predetermined distance from each other, and include a pair of movers each having a permanent magnet, and an elastic member interposed between the movers. 2. The electromagnetic drive mechanism according to claim 1, wherein two electromagnets are arranged, and said permanent magnet has a flat plate shape. 3. An electromagnet having four electromagnets disposed therein, wherein the permanent magnet has a square or circular outer diameter.
2. The electromagnetic drive mechanism according to claim 1, wherein the polarity of the permanent magnet in the circumferential direction is magnetized to a polar anisotropic magnetic pole. 4. The electromagnetic drive mechanism according to claim 1, wherein the iron core is formed by laminating a plurality of electric iron plates. 5. An outer yoke portion integrally formed from a soft magnetic iron plate and side pole portions at both ends, wherein the iron core comprises:
4. The electromagnetic drive mechanism according to claim 1, further comprising a pair of center poles at a center mounted in the outer yoke. 6. The electromagnetic drive mechanism according to claim 4, wherein an outer frame is fixed to the iron core. 7. The electromagnetic drive mechanism according to claim 5, wherein the outer yoke portion is a part of an outer frame. 8. The electromagnetic drive mechanism according to claim 1, wherein a soft magnetic material is provided instead of the permanent magnet. 9. The electromagnetic drive mechanism according to claim 3, wherein a winding coil is incorporated only in a pair of opposing electromagnets among the four electromagnets. 10. A bearing for supporting an end portion in the mover is attached to a winding coil between the center poles at the center.
10. The electromagnetic drive mechanism according to 8 or 9. 11. The method of claim 1, 2, 3, 4, 5, 6, 7,
An electromagnetic vibration type pump comprising: the electromagnetic drive mechanism according to claim 8, 9, or 10, a diaphragm connected to both outer ends of the mover, and a pump casing having pump chambers at both ends of the electromagnetic drive mechanism. 12. The method of claim 1, 2, 3, 4, 5, 6, 7,
An electromagnetic drive mechanism according to claim 8, 9 or 10, and a pump casing having a pump chamber at both ends of the electromagnetic drive mechanism, wherein a piston portion formed on a movable element of the electromagnetic drive mechanism is provided in the pump chamber. An electromagnetic vibration type pump having a cylinder portion having a discharge hole and a discharge valve, which is engaged with the pump. 13. The electromagnetic vibration pump according to claim 12, wherein the pump section and the cylinder section have a substantially elliptical shape.