JPH06200869A - Movable magnet type pump - Google Patents

Abstract

PURPOSE:To eliminate a need for a mechanical restoring mechanism, and thereby simplify the mechanism as well as to increase fluid lifting capacity by letting a magnet movable body be so constituted as to be reciprocated within a fluid introduction chamber. CONSTITUTION:A magnet movable body 10 which comprises a permanent magnet 27 magnetized at least in one axial direction and formed with a fluid through passage 3 in the axial direction, is provided within a fluid introduction chamber 2 in such a way as to be freely slidable, a plurality of coils 11A and 11B are fixedly disposed in such a way that the fluid introduction chamber 2 is enclosed, and a first reverse flow prevention valve 12 is provided for the fluid introduction side of the fluid introduction chamber 2. Concurrently, a second reverse flow prevention valve 25 is provided for the fluid introduction side of the fluid through passage 3, the pump is so constituted that the magnet movable body 10 is reciprocated by means of interaction between current sent to the respective coils 11A and 11B and the magnetic flux of the magnet movable body side, which is intersected with the respective coils 11A and 11B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small movable magnet type pump suitable for pumping a fluid, especially a liquid such as water or kerosene.

[0002]

2. Description of the Related Art Conventionally, as a small pump, an electromagnetic pump (solenoid pump) having an exciting coil for driving a magnetic piston in one direction and a return spring for returning the magnetic piston to its original position is known. (JP-A-55-1
42981).

[0003]

The conventional electromagnetic pump in which the magnetic piston and the exciting coil are combined is as follows.
Since a mechanical return mechanism such as a spring is indispensable, there is a problem that the mechanism becomes complicated and the shape becomes large, and the magnetic piston and the exciting coil become large in order to increase the operating force of the piston. For this reason, it has been difficult to realize a small-sized or ultra-small electromagnetic pump having a sufficient pumping capacity with a conventional electromagnetic pump.

In view of the above points, the present invention has a structure in which a magnet movable body having a through fluid passage is reciprocated in a fluid introducing chamber, and a mechanical return mechanism is not required to simplify the mechanism and reduce the size thereof. It is an object of the present invention to provide a movable magnet type pump capable of increasing the pumping capacity.

[0005]

In order to achieve the above object, a movable magnet pump of the present invention has at least one axially magnetized permanent magnet and has a through fluid passage in the axial direction. The magnet movable body formed is slidably provided in the fluid introduction chamber, a plurality of coils are fixedly arranged so as to surround the fluid introduction chamber, and a first check valve is provided on the fluid introduction side to the fluid introduction chamber. And a second check valve is provided on the fluid delivery side of the through-fluid passage, and the magnet is moved by the interaction between the current supplied to each coil and the magnetic flux on the magnet movable body side that links with each coil. It is configured to reciprocate the body.

[0006]

In the movable magnet type pump of the present invention, the magnet movable body having the through fluid passage is slidably provided in the fluid introducing chamber, and the magnet movable body and the coil are provided based on the left hand rule of Fleming. The magnet movable body is driven by an operating force that is similar to the generated thrust. Therefore, the magnet movable body can be directly electromagnetically reciprocated by the AC voltage, so that a mechanical return mechanism such as a spring is not required and the mechanism can be simplified, and the magnetic movable body is biased in a direction perpendicular to the reciprocating direction. And the movable magnet body can be operated smoothly. Further, the operating force of the magnet movable body can be remarkably larger than the force between the magnetic piston and the exciting coil of the conventional electromagnetic pump, and it is possible to realize a pump having a sufficiently large pumping capacity by making it compact or ultra-compact.

FIG. 6 is a schematic block diagram for explaining the operation principle of the reciprocating motion of the magnet movable body in the case of the first embodiment of the present invention, and FIG. 7 is a schematic view of the magnet movable body in the case of the comparative example. FIG. 9 is a schematic configuration diagram for explaining an operation principle of reciprocating operation, and FIG. 8 is a schematic configuration diagram for explaining an operation principle of reciprocating operation of the movable magnet body in the case of the second embodiment of the present invention. Is.

In the schematic diagram showing the operating principle of the first embodiment shown in FIG. 6, reference numeral 10 denotes a magnet movable body composed of a rod-shaped permanent magnet magnetized in the axial direction, and having magnetic poles on both end faces. The coils 11 </ b> A and 11 </ b> B are wound around the outer peripheral side of the end portion of the magnet movable body 10 so as to circulate in an annular shape, and the same pole is generated in adjacent portions. Although not shown, the coils 11A and 11B are usually attached to a guide cylinder body for guiding the magnet movable body 10 so as to be movable in the axial direction. The magnetic flux from each end surface of the movable magnet body 10 is linked to the coils 11A and 11B, respectively.

In the schematic configuration diagram of the comparative example of FIG. 7, the movable magnet body 20 is composed of two rod-shaped permanent magnets 21 arranged in the same pole and facing each other.
A and 21B and a rod-shaped soft magnetic body 22 fixed between these permanent magnets 21A and 21B are fixed and integrated, and a coil 23 circulates in an annular shape on the outer peripheral side of the intermediate portion of the magnet movable body 20. Is wound like. Although not shown, the coil 23 is usually attached to a guide cylinder for guiding the movable magnet body 20 movably in the axial direction. The magnetic flux from the end faces of the permanent magnets of the magnet movable body 20 facing each other in the same pole is linked to the coil 23.

In the schematic configuration diagram showing the operation principle of the second embodiment of FIG. 8, a movable magnet body 30 is composed of two cylindrical permanent magnets 31A and 31B having the same poles facing each other, and these permanent magnets 3.
A cylindrical soft magnetic body 32 fixed between 1A and 31B is integrated, and three coils 33A, 33B and 3 are connected.
3C is wound so as to go around the outer peripheral side of the magnet movable body 30, and the left end of the permanent magnet 31A constituting the magnet movable body 30 is
Ends of the permanent magnets 31A and 31B facing the same pole, and the permanent magnet 3
They are arranged so as to interlink with the magnetic fluxes from the rightmost magnetic poles of 1B. These coils 33A, 33B, 33
C is connected so that currents flow in different directions with the magnetic poles of the permanent magnets 31A and 31B as a boundary (the boundary between the magnetic poles is not necessarily at the magnetic pole intermediate position as long as it is between the magnetic poles). . Although not shown, the coil 3
3A, 33B, and 33C are usually mounted on guide cylinders for guiding the movable magnet body 30 movably in the axial direction.
The positional relationship between the coils 33A, 33B, 33C and the magnet movable body 30 is such that, in most movable positions including the time when the magnet movable body 30 is stopped, the currents flowing through the coils are separated from each other with the permanent magnet magnetic poles as boundaries. Set it so that it is in the opposite direction.

By the way, in the first and second embodiments and the comparative example, the thrust force generated in the magnet movable bodies 10, 20, 30 basically complies with the thrust force given based on Fleming's left-hand rule. There is (Fleming's left-hand rule is applied to the coil, but since the coil is fixed here, thrust is generated as a reaction force of the force acting on the coil in the movable magnet body.). Therefore, it is the vertical component of the magnetic flux of the permanent magnet of the magnet movable body (the component orthogonal to the axial direction of the permanent magnet) that contributes to the thrust.

[0012] Therefore, we analyzed the vertical component of the magnetic flux in the case of one permanent magnet or two permanent magnets of the same pole facing each other.

FIG. 9 shows the result of magnetic field analysis of the vertical component of the surface magnetic flux density along the longitudinal side surface of a single permanent magnet.
However, the permanent magnet is a rare earth permanent magnet and has a diameter of 2.5 m.
m, length 6mm, 0.25 ~ 0.45mm from the surface of the permanent magnet
The distant positions were measured.

FIG. 10 shows the results of magnetic field analysis of the vertical component of the surface magnetic flux density along the longitudinal side faces of the two permanent magnets when the two permanent magnets are arranged in the same pole and facing each other and are directly bonded. . However, each permanent magnet was a rare earth permanent magnet, had a diameter of 2.5 mm and a length of 3 mm (two pieces were 6 mm), and measured a position apart from the surface of the permanent magnet by 0.25 to 0.45 mm.

FIG. 11 shows a magnetic field analysis of the vertical component of the surface magnetic flux density along the longitudinal side faces of the two permanent magnets when the two permanent magnets have the same poles facing each other and the facing distance is 1 mm. The results are shown. However, each permanent magnet was a rare earth permanent magnet, had a diameter of 2.5 mm and a length of 3 mm, and measured the position 0.25 to 0.45 mm away from the surface of the permanent magnet.

FIG. 12 shows a magnetic field analysis of the vertical component of the surface magnetic flux density along the longitudinal side faces of the two permanent magnets when the two permanent magnets have the same poles facing each other and the facing distance is 2 mm. The results are shown. However, each permanent magnet was a rare earth permanent magnet, had a diameter of 2.5 mm and a length of 3 mm, and measured the position 0.25 to 0.45 mm away from the surface of the permanent magnet.

FIG. 13 shows a magnetic field analysis of the vertical component of the surface magnetic flux density along the longitudinal side faces of the two permanent magnets when the two permanent magnets have the same poles facing each other and the facing distance is 3 mm. The results are shown. However, each permanent magnet was a rare earth permanent magnet, had a diameter of 2.5 mm and a length of 3 mm, and measured the position 0.25 to 0.45 mm away from the surface of the permanent magnet.

FIG. 14 shows a case where two permanent magnets are arranged so as to face each other with the same pole, and a soft magnetic material having a length of 1 mm is arranged between the permanent magnets. The result of magnetic field analysis of the vertical component of the density is shown. However, each permanent magnet was a rare earth permanent magnet, had a diameter of 2.5 mm and a length of 3 mm, and measured the position 0.25 to 0.45 mm away from the surface of the permanent magnet.

In FIG. 15, two permanent magnets are arranged with the same poles facing each other, a soft magnetic material having a length of 1 mm is arranged between the two permanent magnets, and the soft magnetic material is further opposed to the outer circumferences of the two permanent magnets. The results of magnetic field analysis of the vertical component of the surface magnetic flux density along the longitudinal side surfaces of the two permanent magnets when the yoke is arranged are shown. However, each permanent magnet is a rare earth permanent magnet and has a diameter of 2.5 mm and a length of 3 mm, and the yoke has a cylindrical shape surrounding the permanent magnet and has a thickness of 0.5 mm and a length of 10 mm, and is separated from the outer circumference of the permanent magnet by 1.25 mm. The vertical component of the surface magnetic flux density was measured at a position 0.25 to 0.45 mm away from the surface of the permanent magnet.

As described above, the thrust generated in the magnet movable body is basically similar to the thrust given based on Fleming's left-hand rule, and the vertical component of the magnetic flux of the permanent magnet interlinking with the coil. Although it is desirable that there are many (components orthogonal to the axial direction of the permanent magnet), in the principle diagram of the operation of the first embodiment of FIG. 6, the vertical component of the surface magnetic flux density is as shown in FIG. The vertical component is smaller than that in the case where two permanent magnets 15 are arranged with the same poles facing each other, but a large operating force is obtained as compared with a conventional electromagnetic pump that attracts a magnetic piston with an exciting coil. For example, the magnet movable body 1
0 is composed of a rare earth permanent magnet with a diameter of 2.5 mm and a length of 6 mm, and a current of 40 mA is applied to each coil 11A, 11B so that the same pole is generated in the adjacent part of the two coils 11A, 11B. The thrust F1 generated at was 4.7 (gf). If the current of each coil is reversed, the direction of the thrust of the movable magnet body 10 is also reversed. When an alternating current is applied, it works as a reciprocating actuator that repeats vibration at a constant cycle.

Further, in the comparative example of FIG. 7, a magnet movable body 20 in which a soft magnetic material is arranged between two permanent magnets of the same pole facing each other is used, and the vertical component of the magnetic flux density is as shown in FIG. ,
Although the magnetic flux generated from the magnetic poles of the permanent magnets 21A and 21B facing each other with the same pole is larger than in the case of one permanent magnet (see FIG. 9) or the case of only two permanent magnets (see FIGS. 10 to 13), There is only one coil that surrounds the intermediate portion of the magnet movable body 20, and the magnetic flux from the magnetic poles on both end surfaces of the magnet movable body 20 is not effectively used. Therefore, in the case of the comparative example of FIG.
The improvement in thrust is small compared to the combination of individual permanent magnets. For example, in the comparative example of FIG. 7, two rare earth permanent magnets having a diameter of 2.5 mm and a length of 3 mm are used as the magnet movable body 20 (the performance of the rare earth permanent magnet is the same as that of the first embodiment),
In addition, a soft magnetic material having a length of 1 mm is arranged between the two, and a current of 40 mA is applied to the coil 23 made to have the same power consumption as in the first embodiment of FIG. The thrust F2 generated at the time of power consumption is 5.6 (g
f).

Further, in the operation principle diagram of the second embodiment of FIG. 8, the structure of the magnet movable body 30 is such that the two permanent magnets have the same poles facing each other and a soft magnetic body is provided between the permanent magnets as shown in FIG. It is arranged. In FIG. 14, the vertical component of the surface magnetic flux density in the region Q corresponding to the position of the soft magnetic material is superior to that in FIGS.
The peak width of 3T or more is wide and the peak is high. ).

Thus, the two permanent magnets 31A, 31
The magnet movable body 30 in which B is made to face the same pole and the soft magnetic body 32 is provided between the permanent magnets can increase the magnetic flux component perpendicular to the longitudinal direction of the magnet movable body 30 which can contribute to the thrust force based on Fleming's left-hand rule. , And triple coils 33A, 33
Since B and 33C effectively interlink with the magnetic fluxes of all the magnetic poles of the permanent magnet, the first embodiment is performed by applying a current to the three coils 33A, 33B, and 33C in the directions that alternately generate magnetic fields of opposite polarities. It is possible to generate a large thrust that cannot be reached in the examples and comparative examples. If the current of each coil is reversed, the direction of the thrust of the movable magnet body 30 is also reversed. When an alternating current is applied, it works as a reciprocating actuator that repeats vibration at a constant cycle. In the operation principle diagram of the second embodiment of FIG. 8, for example, two rare earth permanent magnets having a diameter of 2.5 mm and a length of 3 mm are used as the magnet movable body 30 (the performance of the rare earth permanent magnet is the same as that of the first embodiment or the comparison example). The same as the example), and a soft magnetic material having a length of 1 mm is arranged between the two, and the three series were made to have the same power consumption as those of the first example and the comparative example of FIGS. 40mA to the coils 33A, 33B, 33C of
The thrust force F3 generated when the same power consumption was made by applying the current of No. 2 was 6.7 (gf). This is a thrust of about 1.42 times that of the first embodiment with the same power consumption, and a thrust of about 1.2 times that of the comparative example, which is significantly higher than that of the first and comparative examples. It turns out that it is excellent.

The curve (a) in FIG. 16 is shown in FIG. 8 (without yoke).
The relationship between the axial displacement amount of the magnet movable body 30 and the thrust force (gf) in the case of is shown. However, the dimensions and characteristics of the permanent magnet are as shown in FIG. 14, and the displacement amount is zero when the midpoint of the magnet movable body 30 is located at the midpoint of the central coil 33B, and the current of each coil is 40 mA. And

A curve (B) in FIG. 16 is a magnet movable body in the case where a magnetic yoke is added to the operation principle diagram in FIG. 8 (however, the dimensions and arrangement of the permanent magnet and the yoke and the characteristics of the permanent magnet are as shown in FIG. 15). The relationship between the axial displacement amount of 30 and the thrust (gf), and shows the case where the movable magnet body moves in the direction away from the point of zero displacement amount. The curve (c) shows the relationship between the axial displacement of the magnet movable body 30 and the thrust (gf) in the same configuration, and shows the case where the movable body 30 operates in a direction approaching the point of zero displacement.
However, the displacement amount was set to 0 when the midpoint of the movable magnet body 30 was located at the midpoint of the central coil 2B, and the current of each coil was set to 40 mA. As described above, the thrust differs depending on whether the movable magnet body 30 approaches or moves away from the point where the displacement amount is zero, because the movable magnet body 30 is displaced between the magnetic pole of the permanent magnet of the movable magnet body 30 and the yoke. This is because the magnetic attraction force that returns the zero point is working.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a movable magnet pump according to the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention. As shown in this figure, the movable magnet type pump of the first embodiment has a cylindrical yoke 1 made of a soft magnetic material, two coils 11A and 11B arranged inside the cylindrical yoke 1, and a movable magnet. Body 1
0 and the two continuous coils 11A and 11B are fixed to the cylindrical yoke 1 by a guide cylinder 4 whose inner peripheral surface serves as a fluid introduction chamber 2 for slidably guiding the magnet movable body 10. . The guide cylinder 4 is an insulating member (nonmagnetic material) such as insulating resin.

The magnet movable body 10 is a cylindrical rare earth permanent magnet 27 axially magnetized so as to have magnetic poles on both end surfaces.
Is covered with a non-magnetic cylindrical holder 28, and a penetrating fluid passage 3 is formed so as to penetrate the central portion in the axial direction.
The cylindrical holder 28 covers the permanent magnet 27 so as to form the outer peripheral surface and both end surfaces of the magnet movable body 10, but can cover the inner peripheral surface of the through fluid passage 3 (that is, the entire surface of the magnet movable body 10 is covered). It must be composed of a non-magnetic holder 28),
Most desirable.

The coils 11A and 11B are wound around the outer circumference of the end of the magnet movable body 10 so as to circulate in an annular shape, and are connected so that the same poles are generated in adjacent portions. The magnetic flux from each end face of 10 interlinks with the coils 11A and 11B, respectively.

Guide cylinder 4 having the fluid introducing chamber 2 formed therein
The fluid introduction side member 5 is watertightly fixed to one end of the through an O-ring 61 and a stopper plate 62. The fluid introduction side member 5 has a fluid introduction path 8 which is open at one end as a fluid introduction port 7 and communicates with the fluid introduction chamber 2 at the other end, and the first backflow is made to the large diameter portion 6 formed in the middle thereof. A prevention valve 12 is provided. That is, the first check valve 12 includes a seal member 14 such as rubber fixedly arranged in a portion of the large diameter portion 6 which serves as a valve seat portion.
And a magnetic valve body 15 such as a steel ball that closes the fluid introduction passage 8 when it is pressed against the sealing material 14, and a valve body suction permanent magnet 16 arranged outside the fluid introduction side member 5. There is. Therefore, the magnetic valve element 15 is the permanent magnet 1 for attracting the valve element.
6 is urged in a direction in which it comes into pressure contact with the sealing material 14. The fluid introduction side member 5 is preferably a non-magnetic material.

The movable magnet body 1 of the stopper plate 62
A cushion member 63 for restricting the stroke of the magnet movable body 10 is fixed to the surface facing 0.

Guide cylinder 4 having the fluid introduction chamber 2 formed therein
The fluid discharge side member 17 is watertightly fixed to the other end of the through an O-ring 64. That is, the fluid discharge side member 17
The pressing plate 65 that presses the flange part of the
At 6, attach to the flange portion of the cylindrical yoke 1 and tighten. The fluid discharge side member 17 has a fluid discharge passage 19 communicating with the fluid introduction chamber 2. A nozzle member 67 having a fluid discharge port 18 communicating with the fluid discharge passage 19 is fixed to the tip end side portion of the fluid discharge side member 17.

Further, a magnetic valve body 26 such as a steel ball is provided so as to constitute the second check valve 25 between the magnet movable body 10 and the end face on the fluid discharge side. The magnetic valve body 26 is passed through the through-fluid passage 3 by the permanent magnet 27 in the magnet movable body 10.
Is sucked in a direction to close the. The movable magnet body 1
A sealing material 70 such as rubber is fixed to the end face of the fluid discharge side of No. 0. In addition, a cushion member 68 that regulates the stroke of the valve body 26 and the movable magnet body 10 is fixed to the inner recess of the fluid discharge side member 17.

In the configuration of the first embodiment, as described in the operation principle diagram of FIG. 6, the two coils 11A and 11B are connected so that the same pole is generated in the adjacent portions, and the alternating current is generated. The magnet movable body 10 can be reciprocated in the fluid introduction chamber 2 by energizing. As a result, in the process of moving the magnet movable body 10 to the fluid discharge side, the magnet movable body 10 moves while the magnetic valve body 26 of the second check valve 25 closes the through fluid passage 3. Room 2
A fluid (for example, liquid such as water or kerosene) is introduced into the fluid inlet 7,
The fluid is introduced through the fluid introduction path 8 and the path of the first check valve 12. Then, in the process of moving the magnet movable body 10 to the fluid introduction side, the magnet movable body 10 moves with the magnetic valve body 15 of the first check valve 12 blocking the fluid introduction passage 8, so that the fluid introduction chamber is moved. The fluid in 2 moves to the fluid discharge side of the magnet movable body 10 through the second backflow prevention valve 25, and along with the movement of the magnet movable body 10 to the fluid discharge side thereafter, it passes through the fluid discharge passage 19 and the fluid discharge port 18 Is discharged from.

According to the first embodiment, the movable magnet body 10
The magnetic movable body 10 can be efficiently reciprocated by the magnetic flux from the permanent magnet and the current based on the Fleming's left-hand rule that acts between the currents of the two coils 11A and 11B that are linked to the magnetic flux. Therefore, a mechanism such as a return spring is unnecessary, and the mechanism can be simplified. Further, the reciprocating operation of the magnet movable body 10 is smoothly performed with good followability with respect to the frequency of the current passed through the coils 11A and 11B, and high speed operation is also possible by increasing the frequency. Further, since the penetrating fluid passage 3 penetrates the magnet movable body 10, there is an advantage that the magnet movable body 10 is effectively cooled. Also, the first
And the second check valves 12 and 25 are magnetic valve elements 1 such as steel balls.
This is a simple structure in which 5, 26 are attracted by a permanent magnet, and the mechanism is also simplified in this respect.

FIG. 2 shows a second embodiment of the present invention. As shown in this figure, the movable magnet pump of the second embodiment includes a soft magnetic cylindrical yoke 41, three coils 33A, 33B and 33C arranged inside the cylindrical yoke 41. A movable magnet 30 and three coils 33A, 33B, 3
3C is a guide cylinder 44 whose inner peripheral surface serves as a fluid introduction chamber 42 for slidably guiding the magnet movable body 30.
It is fixed at 1. The guide cylinder 44 is an insulating member (nonmagnetic material) such as insulating resin.

The magnet movable body 30 has the same pole facing each other.
It consists of individual columnar rare earth permanent magnets 31A, 31B, a columnar soft magnetic body 32 arranged between these permanent magnets 31A, 31B, and a non-magnetic cylindrical holder 47, the central portion of which is arranged in the axial direction. A penetrating fluid passage 43 is formed so as to penetrate therethrough. The permanent magnets 31A and 31B and the soft magnetic body 32 are housed in a cylindrical holder 47, fixed and integrated. The cylindrical holder 47 covers the permanent magnet and the soft magnetic material so as to form the outer peripheral surface and both end surfaces of the magnet movable body 30, but does not cover the inner peripheral surface of the penetrating fluid passage 43 (that is, the magnet movable body 30). Most preferably, the entire surface is composed of the non-magnetic holder 47).

The three continuous coils 33A, 33B, 33C are wound so as to circulate in an annular shape, and the permanent magnets 31A, 31
The magnetic poles of B are connected so that currents flow in different directions. That is, the central coil 33B surrounds the ends of the soft magnetic body 32 and the permanent magnets 31A and 31B including the N pole, and the coils 33A and 33C on both sides are the permanent magnets 31A and 31B.
The ends of the A and 31B including the S poles can be respectively surrounded, and the direction of the current flowing through the central coil 33B is opposite to the direction of the current flowing through the coils 33A and 33C on both sides. (See N and S attached to each coil in FIG. 2).

A fluid introduction side member 45 is watertightly fixed to one end of a guide cylinder 44 in which the fluid introduction chamber 42 is formed via an O-ring 61 and a stopper plate 62. The fluid introduction side member 45 has a fluid introduction path 48 which is open at one end as a fluid introduction port 47 and communicates with the fluid introduction chamber 42 at the other end, and a first backflow is made to a large diameter portion 46 formed in the middle thereof. Prevention valve 5
Two are provided. That is, the first check valve 52
Is a sealing member 54 made of rubber or the like which is fixedly arranged at a portion of the large-diameter portion 46 which serves as a valve seat portion, and a magnetic valve body 55 such as a steel ball which closes the fluid introduction passage 48 when it is pressed against the sealing member 54. When,
It is composed of a valve body suction permanent magnet 56 arranged outside the fluid introduction side member 45. Therefore, the magnetic valve body 55
Is urged by a permanent magnet 56 for attracting the valve element in a direction in which it is pressed against the sealing material 54. The fluid introduction side member 45 is preferably a non-magnetic material.

The magnet movable body 3 of the stopper plate 62
A cushion material 63 for restricting the stroke of the magnet movable body 30 is fixed to the surface facing 0.

A fluid discharge side member 57 is watertightly fixed to the other end of the guide cylinder body 44 in which the fluid introduction chamber 42 is formed via an O-ring 64. That is, the pressing plate 65 that presses the flange portion of the fluid discharge side member 57 from above is attached to the flange portion of the cylindrical yoke 41 with the bolt 66 and tightened. The fluid discharge side member 57 has a fluid discharge passage 59 communicating with the fluid introduction chamber 42. Fluid discharge side member 5
A nozzle member 67 having a fluid discharge port 58 communicating with the fluid discharge passage 59 is fixed to the tip end side portion of 7.

Further, a magnetic valve body 76 such as a steel ball is provided so as to form a second check valve 75 between the magnet movable body 30 and the end face on the fluid discharge side. The magnetic valve body 76 is attracted by the permanent magnet 31A in the movable magnet body 30 in a direction to close the through fluid passage 43. A sealing material 70 such as rubber is fixed to the end surface of the movable magnet body 30 on the fluid discharge side. Further, a cushion member 68 that regulates the stroke of the valve body 76 and the movable magnet body 30 is fixed to the inner recess of the fluid discharge side member 57.

In the configuration of the second embodiment, as described in the operation principle diagram of FIG. 8, the triple coil 33A,
A magnet movable body 30 is generated by applying an alternating current to 33B and 33C in a direction in which magnetic fields having opposite polarities are alternately generated.
Can be reciprocated in the fluid introduction chamber 42. As a result, in the process of moving the magnet movable body 30 to the fluid discharge side, the magnetic valve body 76 of the second check valve 75 is passed through the through fluid passage 4.
Since the magnet movable body 30 moves in a state where 3 is closed, a fluid (for example, a liquid such as water or kerosene) is introduced into the fluid introduction chamber 42 by the fluid introduction port 47, the fluid introduction passage 48, and the first check valve 52. Will be introduced through the route. Then, in the process of moving the magnet movable body 30 to the fluid introduction side, the magnet movable body 30 moves while the magnetic valve body 55 of the first check valve 52 closes the fluid introduction passage 48, so that the fluid introduction chamber. Four
The fluid in 2 moves to the fluid discharge side of the magnet movable body 30 through the second check valve 75, and then moves to the fluid discharge side of the magnet movable body 30 and passes through the fluid discharge passage 59 and the fluid discharge port 58. Is discharged from.

According to the second embodiment, the movable magnet body 30 is used.
The magnetic movable body 30 reciprocates very efficiently by the magnetic flux from the permanent magnets and the currents of the three coils 33A, 33B and 33C interlinking with the magnetic fluxes, which are based on the thrust based on Fleming's left-hand rule. Can be moved. As described in the operation principle diagram of FIG. 8, the magnet movable body 30 is composed of a structure in which a soft magnetic material is sandwiched between permanent magnets of the same pole facing each other. ) Is sufficiently large and the magnetic flux generated by all the magnetic poles of the permanent magnet can be effectively used, the three coils 33A, 33B, 33C wound around the magnet movable body 30 are wound.
The thrust force based on the Fleming's left-hand rule with respect to the current flowing therethrough can be made sufficiently large, and the driving force can be made extremely large even when the magnet movable body 30 is made small. In addition,
Other functions and effects are similar to those of the first embodiment described above.

FIG. 3 shows a modified example of the second check valve in the first or second embodiment, in which the extension portion 100 of the non-magnetic cylindrical holder 28, 47 is provided on the fluid discharge side of the magnet movable body 10, 30.
Is provided, and the extension portion 100 presses the spring 101 and the valve body 102 having a spherical shape or the like. Therefore, the valve body 102 is biased by the spring 101 in the direction in which it comes into pressure contact with the seal material 70 on the fluid discharge side end surfaces of the magnet movable bodies 10 and 30, and closes the through fluid passages 3 and 43. In the case of the configuration of FIG. 3,
The valve body 102 does not have to be a magnetic body.

FIG. 4 shows another modification of the second check valve in the first or second embodiment.
A concave portion 80 is formed on the fluid discharge side of 0 and 30 and through fluid passages 3 and 43 are opened therein, and the opening is closed by a spherical valve element 82 urged by a spring 81. .
A spring retainer 83 is fixed to the end faces of the magnet movable bodies 10 and 30 on the fluid discharge side. In the case of the configuration of FIG. 4,
The valve body 82 does not have to be a magnetic body.

FIG. 5 shows a modification of the first check valve in the first or second embodiment, in which the large diameter portions 6 and 46 of the fluid introducing members 5 and 45 are made of rubber or the like at the portions to be valve seat portions. Seal material 1
4, 54 are fixedly arranged, and a valve element 90 having a spherical shape is biased by a spring 91 so as to come into pressure contact therewith. In addition,
The stopper plate 62 also functions as a ridge presser. In addition, 1 and 41 are yokes, and 8 and 48 are fluid introduction paths.
Also in the case of FIG. 5, the valve body 90 does not have to be a magnetic body.

As the structure of the first and second check valves, a structure other than those shown in FIGS. 3 to 5 can be adopted.

[0049]

As described above, according to the movable magnet type pump of the present invention, the electromagnetic force between the magnet movable body having the penetrating fluid passage and the current flowing through the plurality of coils is utilized. Since the magnet movable body is configured to reciprocate in the fluid introduction chamber, a mechanical return mechanism is not required, the mechanism can be simplified, and a small size and a large pumping capacity can be realized.

[Brief description of drawings]

FIG. 1 is a front sectional view showing a first embodiment of a movable magnet type pump according to the present invention.

FIG. 2 is a front sectional view showing a second embodiment of the present invention.

FIG. 3 is a partial cross-sectional view showing a modified example of the second check valve in the first or second embodiment.

FIG. 4 is a partial cross-sectional view showing another modification of the second check valve in the first or second embodiment.

FIG. 5 is a partial cross-sectional view showing a modified example of the first check valve in the first or second embodiment.

FIG. 6 is a schematic configuration diagram for explaining the operation principle of the first embodiment.

FIG. 7 is a schematic configuration diagram showing a comparative example.

FIG. 8 is a schematic configuration diagram for explaining the operation principle of the second embodiment.

FIG. 9 is a graph showing a vertical component (a component perpendicular to a longitudinal side surface) of a surface magnetic flux density on a longitudinal side surface (a surface parallel to a magnetizing direction of the permanent magnet) of a single permanent magnet.

FIG. 10 is a graph showing the vertical component of the surface magnetic flux density on the longitudinal side surface when two permanent magnets of the same pole facing each other are directly brought into contact with each other.

FIG. 11 is a graph showing the vertical component of the surface magnetic flux density on the longitudinal side surface when two permanent magnets are in the same pole facing state with an air gap of 1 mm.

FIG. 12 is a graph showing the vertical component of the surface magnetic flux density on the longitudinal side surface when two permanent magnets are in the same pole facing state with an air gap of 2 mm.

FIG. 13 is a graph showing the vertical component of the surface magnetic flux density on the longitudinal side face when two permanent magnets are in the same pole facing state with an air gap of 3 mm.

FIG. 14 is a graph showing the vertical component of the surface magnetic flux density on the longitudinal side face when two permanent magnets are in the state of having the same pole facing each other with a soft magnetic material interposed therebetween.

FIG. 15 is a graph showing the vertical component of the surface magnetic flux density on the longitudinal side surface when two permanent magnets are in the same pole facing state with a soft magnetic material interposed and a soft magnetic material yoke is arranged.

16 is a graph showing the relationship between the amount of displacement of the movable magnet body and thrust in the principle diagram of operation of the second embodiment of FIG.

[Explanation of symbols]

 1,41 Cylindrical yoke 2,42 Fluid introduction chamber 3,43 Fluid introduction path 4,44 Guide cylinder 10,30 Magnet movable body 11A, 11B, 33A, 33B, 33C Coil 12,52 First check valve 25 , 75 Second check valve 31A, 31B Cylindrical permanent magnet 32 Cylindrical soft magnetic material 47 Cylindrical holder

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[Procedure amendment]

[Submission date] August 2, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 1

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 4

[Correction method] Change

[Correction content]

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0005

[Correction method] Change

[Correction content]

[0005]

In order to achieve the above object, a movable magnet pump of the present invention has at least one axially magnetized permanent magnet and has a through fluid passage in the axial direction. The movable magnet body formed is slidably provided in the fluid introducing chamber, and a plurality of coils are fixedly arranged so as to surround the fluid introducing chamber, and the number of fluid passages communicating with the fluid introducing chamber is reduced.
Both provided with one first check valve of said magnetic
A second check valve is provided on the stone movable body, and the magnet movable body is reciprocated by the interaction between the current supplied to each coil and the magnetic flux on the side of the magnet movable body that links with each coil.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0028

[Correction method] Change

[Correction content]

The magnet movable body 10 is a cylindrical rare earth permanent magnet 27 axially magnetized so as to have magnetic poles on both end surfaces.
Is covered with a non-magnetic cylindrical holder 28, and a penetrating fluid passage 3 is formed so as to penetrate the central portion in the axial direction.
The cylindrical holder 28 covers the permanent magnet 27 so as to form the outer peripheral surface and both end surfaces of the magnet movable body 10, but can cover the inner peripheral surface of the penetrating fluid passage 3 (that is, the entire surface of the magnet movable body 10 can be covered). It must be composed of a non-magnetic holder 28),
Most desirable. For example, as the cylindrical holder 28, a stainless steel
Using a double pipe structure such as a steel, a through hole was opened inside
Both ends of the double pipe structure after housing the permanent magnet 27
May be configured to be closed.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0035

[Correction method] Change

[Correction content]

According to the first embodiment, the movable magnet body 10
The magnetic movable body 10 can be efficiently reciprocated by a magnetic flux from the permanent magnet and a current based on the Fleming's left-hand rule that acts between the currents of the two coils 11A and 11B that are linked to the magnetic flux. Therefore, a mechanism such as a return spring is unnecessary, and the mechanism can be simplified. Further, the reciprocating operation of the magnet movable body 10 is smoothly performed with good followability with respect to the frequency of the current passed through the coils 11A and 11B, and high speed operation is also possible by increasing the frequency. Further, since the penetrating fluid passage 3 penetrates the magnet movable body 10, there is an advantage that the magnet movable body 10 is effectively cooled. Also, the first
And the second check valves 12 and 25 are magnetic valve elements 1 such as steel balls.
This is a simple structure in which the permanent magnets 5 and 26 are attracted by a permanent magnet, and also in this respect, the mechanism is simplified. Furthermore, a magnet movable body
As 10, the permanent magnet 27 is covered with a non-magnetic holder 28.
By making it, it is possible to prevent the rust of the permanent magnet 27 from occurring.
And to improve the wear resistance of the movable magnet body 10.
it can.

[Procedure correction 6]

[Document name to be amended] Statement

[Name of item to be corrected] 0037

[Correction method] Change

[Correction content]

The magnet movable body 30 has the same pole facing each other.
It is composed of individual columnar rare earth permanent magnets 31A, 31B, a columnar soft magnetic body 32 arranged between these permanent magnets 31A, 31B, and a non-magnetic cylindrical holder 47, and the central portion of these is arranged in the axial direction. A penetrating fluid passage 43 is formed so as to penetrate therethrough. The permanent magnets 31A and 31B and the soft magnetic body 32 are housed in the cylindrical holder 47, fixed and integrated. The cylindrical holder 47 covers the permanent magnet and the soft magnetic material so as to form the outer peripheral surface and both end surfaces of the magnet movable body 30, but also covers the inner peripheral surface of the through fluid passage 43 (that is, the magnet movable body 30 is covered). Most preferably, the entire surface is composed of the non-magnetic holder 47). For example, a cylindrical holder
A double pipe structure such as stainless steel is used as the da 47,
Permanent magnets 31A and 31B with through holes formed inside and soft magnets
After storing the body 32, close both ends of the double pipe structure.
It may be configured such that it is closed.

[Procedure Amendment 7]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigeo Saito 1-13-1, Nihonbashi, Chuo-ku, Tokyo TDK Corporation

Claims (5)

[Claims] 1. A magnet movable body having at least one axially magnetized permanent magnet and having a through-fluid passage formed in the axial direction is slidably provided in the fluid introducing chamber. A plurality of coils are fixedly arranged so as to surround the introduction chamber, a first check valve is provided on the fluid introduction side to the fluid introduction chamber, and a second check valve is provided on the fluid delivery side of the through fluid passage. A movable magnet pump that reciprocates the movable magnet body by an interaction between a current supplied to each coil and a magnetic flux on the movable magnet body side that links the coils. 2. The magnet movable body is configured by providing a magnetic body between at least two permanent magnets facing each other with the same pole, and the plurality of coils are at least three consecutive and the at least three consecutive. The movable magnet pump according to claim 1, wherein the coils are connected so that currents flow in different directions with the magnetic poles of the permanent magnets as boundaries. 3. The movable magnet according to claim 1, wherein a magnetic yoke is provided on the outer peripheral side of the coil to form a magnetic circuit for increasing a magnetic flux component in a direction perpendicular to the axial direction of the magnet movable body. Pump. 4. The first check valve includes a first magnetic valve body and a permanent magnet for attracting the valve body, and the permanent magnet for attracting the valve body closes a fluid introduction path to the fluid introduction chamber. 3. The first magnetic valve element is biased in the direction.
Alternatively, the movable magnet pump described in 3 above. 5. The second check valve has a second magnetic valve element, and biases the second magnetic valve element in a direction to close the through fluid passage with a permanent magnet of the magnet movable body. The movable magnet pump according to claim 1, wherein the movable magnet pump is a pump.