JPH0421073B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a moving magnet diaphragm pump. More specifically, by reciprocating the vibrator through magnetic interaction between a vibrator connected to the diaphragm and an electromagnetic coil provided on the outer periphery of the vibrator, the diaphragm linked to the vibrator is caused to reciprocate. The present invention relates to a movable magnet diaphragm pump that sucks fluid and then discharges it in conjunction with this.

This device is mainly used for oxygen supplementation in fish tanks, garden ponds, and septic tanks, and for sampling test gases in pollution monitoring.

[Prior Art] Conventionally, this type of diaphragm pump is described in Japanese Patent Application Laid-open No. 84603/1983. An outline of such a diaphragm pump is shown in FIG.

In FIG. 4, 21 is a yoke, and its upper half and lower half (hereinafter referred to as
The upper, lower, left, and right portions shown in Figs. 1 to 4) are E-shaped, axially symmetrical, and cylindrical, and the central shaft portion thereof is hollow. Further, as the material of the yoke 21, a ferromagnetic material such as Fe is used. Cylindrical electromagnetic coils 22a and 22b having donut-shaped cross sections and having the same central axis as the yoke 21 are provided in the right and left halves of the yoke 21, respectively, in contact with the inner surface of the yoke 21. A cylindrical vibrator 23, which is slightly shorter than the yoke 21, is provided at the center of the yoke 21 along the longitudinal direction of the yoke 21 so that the central axis is the same as that of the yoke 21. The left end is formed to extend close to the right and left ends of the yoke 21. The vibrator 23 is provided with a permanent magnet 24 made of a cast magnet or the like, with the right end being an N pole and the left end being an S pole. The magnetic pole pieces 27a and 27b are fixed. Further, the vibrator 23 is fixed, and the vibrator 2
Diaphragms 26a and 26b are fixed to both ends of a support shaft 25 that is formed along the central axis of 3.

During a certain half-wave of the alternating current flowing through the electromagnetic coils 22a and 22b, magnetic poles with polarities indicated by N and S in FIG. 4 appear at the inner peripheral end of the yoke 21, and during the next half-wave, ,
Similarly, magnetic poles of polarity indicated by N and S appear.

In the diaphragm pump having such a configuration, by applying alternating current to the electromagnetic coils 22a and 22b, the magnetic pole generated at the inner peripheral end of the yoke 21 and the N and S poles generated at both ends of the vibrator 23 are separated.
A magnetic interaction occurs between the pole and the magnetic pole, which causes the oscillator 23 to move to the right during the previous half-wave,
It is moved to the left during the next half wave. In this way, the vibrator 23 vibrates in the left-right direction in synchronization with the cycle of the applied alternating current, and the diaphragms 26a and 26b also vibrate in conjunction with this. Then, regular pressure fluctuations are applied to the fluid in the working chambers (not shown) provided on the right side of the diaphragm 26a and the left side of the diaphragm 26b, and the fluid is sucked into the working chamber or the fluid is pumped outside the working chamber. By discharging, the diaphragm pump functions as a pump.

[Problems to be Solved by the Invention] In the conventional diaphragm pump, in order to strengthen the residual magnetization of the permanent magnet 24 made of a cast magnet attached to the support shaft 25, it is necessary to increase the permeance coefficient of the magnet. Therefore, permanent magnets with long dimensions are used, and the magnetic force acting between the magnetic poles generated at the inner circumferential ends of the left and right ends of the yoke 21 and the S and N poles of the permanent magnet 24. To strengthen the permanent magnet 2
Since isotropic magnetic pole pieces 27a and 27b are provided on the left and right end surfaces of the vibrator 2,
3 has a very large weight.

Therefore, the natural frequency of the vibrator 23, which is determined by the elastic force of the diaphragm and the weight of the vibrator 23, becomes, for example, 40 Hz or less, and the frequency ( 50Hz or 60Hz), and as a result, alternating changes in the alternating current and vibrations of the vibrator become resonant, causing the diaphragm pump's discharge capacity to rapidly increase. There is a problem that the drive efficiency of the pump is poor.

The present invention was made to solve the above-mentioned problems, and it reduces the weight of the vibrator and increases the magnetic interaction force between the electromagnetic coil and the vibrator, thereby reducing alternating current. It is an object of the present invention to provide a movable magnet diaphragm pump that achieves a state of resonance between the change in vibration and the vibration of a vibrator, thereby increasing the driving efficiency of the pump.

[Means for Solving the Problems] The movable magnet diaphragm pump of the present invention includes an electromagnetic coil, a vibrator inserted into the electromagnetic coil, connected to the diaphragm, and provided with a pair of permanent magnets. is mounted, and a first permanent magnet and a second permanent magnet are provided at a distance from each other in a portion of the vibrator corresponding to the S pole and N pole of the electromagnetic coil. In a diaphragm pump in which the polarity of the magnetic poles in the axial direction on opposing sides is the same, and a state core made of a magnetic material is interposed between the electromagnetic coil and the vibrator, the first permanent magnet and The second permanent magnet is provided with a magnetic shoe that forms an operating magnetic field with a large magnetic flux density between the magnetic poles of these permanent magnets and each of the S and N poles of the electromagnetic coil. It is said that

[Examples] Hereinafter, the present invention will be explained based on drawings showing examples thereof.

Figure 1 shows an embodiment of the present invention in which the discharge amount per minute is
10 is a partial cross-sectional view of a movable magnet type diaphragm pump. In FIG. 1, reference numeral 1 denotes an electromagnetic coil having a donut-shaped cross section, and a conducting wire is wound around a hollow portion formed in the center of the electromagnetic coil. The outer periphery of the electromagnetic coil 1 has a cylindrical shape with a thickness of about 1 mm made of a 0.3 mm silicon steel plate spirally wound so as to cover the electromagnetic coil 1 and share a central axis with the electromagnetic coil 1. A yoke core 3 is provided.

Then, on the inner circumferential surface of the electromagnetic coil 1 and on both end surfaces of the left and right sides shown in FIG. 1 (hereinafter left, right, top, and bottom refer to those in FIG. On a longitudinal section with a thickness of 2 to 3 mm,
A bobbin 2 made of 66 nylon is provided, each lower half of which is U-shaped. and bobbin 2
A right yoke plate core 4a and a left yoke plate core 4b, which are made by laminating several donut-shaped silicon steel plates with a thickness of 0.5 mm, are fixed on both the left and right end surfaces of the plate. It is set up. The yoke plate cores 4a and 4b protrude slightly from the inner circumferential surface of the bobbin 2 in the direction of the central axis. On the right end surface of the yoke plate core 4a and the left end surface of the yoke plate core 4b, a right side plate 5a and a left side plate 5b, which are made of polycarbonate and are of the same shape and have a substantially donut plate shape, are provided in contact with these, respectively. There is. Recesses are formed on the right side of the side plate 5a and on the left side of the side plate 5b, the inner diameter of which is slightly smaller than the outer diameter of the yoke plate cores 4a, 4b.

And electromagnetic coil 1, bobbin 2 and yoke core 3
and yoke plate cores 4a, 4b are sandwiched by being connected by appropriate means by the two side plates 5a, 5b. A support shaft 6 for a vibrator (described later) is provided at the center axis of the electromagnetic coil 1 and extends in the direction of the center axis.
A short cylindrical ferrite magnet 7, which is a first permanent magnet on the right side, is located at a portion corresponding to the inner peripheral end of b.
A and a ferrite magnet 7b, which is a second permanent magnet on the left side, are fixedly provided by appropriate means. The central axes of the ferrite magnets 7a and 7b coincide with the central axis of the support shaft 6. Furthermore, the polarities of the magnetic poles in the axial direction of the opposing surfaces of the ferrite magnets 7a and 7b are both S-poles, and therefore the polarities of the magnetic poles on these opposing surfaces are N-poles.

Then, on both the left and right end surfaces of each of the ferrite magnets 7a and 7b, several disk-shaped silicon steel plates, which are isotropic magnetic materials and have a thickness of 0.5 mm, were laminated in contact with these. Magnetic shoes 8a, 8b, 8c, and 8d are fixedly provided by suitable means.
The outer peripheral end faces of each of b, 8c, and 8d are formed flush with each other. The left end surface of the magnetic shoe 8a provided at the leftmost end is braked by appropriate means so that it can move within a range of approximately 10 mm to the left from the left end surface of the yoke plate core 4b, and similarly, the left end surface of the magnetic shoe 8a provided at the farthest right end is braked by appropriate means so that it can move within a range of approximately 10 mm to the left from the left end surface of the yoke plate core 4b. The right end surface of the magnet shoe 8d located at 4 is movable to the right within a range of about 10 mm from the right end surface of the yoke plate core 4a. At the same time, the right end surface of the magnetic shoe 8b is approximately 14 mm to the right of the left end surface of the yoke plate core 4b.
The left end surface of the magnetic shoe 8c can be moved within a range of approximately 14 mm to the left of the right end surface of the yoke plate core 4a.

Between the magnetic shoes 8b and 8c, a silicon steel plate whose central axis coincides with the central axis of the support shaft 6 and whose thickness is 0.3 mm is spirally wound to have a total thickness of about 1 mm. A cylindrical pole core 9 is provided, and the left and right end surfaces of the pole core 9 are respectively connected to magnetic shoes 8b.
and the left end surface of the magnetic shoe 8c. The outer circumferential surface of the pole core 9 is substantially flush with the outer circumferential surfaces of the ferrite magnets 7a and 7b. A gap of approximately 1 mm is formed between these outer peripheral surfaces and the inner peripheral surfaces of the yoke plate cores 4a, 4b. A vibrator 10 is composed of a support shaft 6, ferrite magnets 7a, 7b, magnetic shoes 8a, 8b, 8c, 8d, and a pole core 9. Between the pole core 9 and the bobbin 2 and approximately in the center of the bobbin 2, a silicon steel plate with a thickness of 0.3 mm and whose center axis coincides with the center axis of the support shaft 6 is wound in a spiral shape. A cylindrical state core 11 having a thickness of approximately 2 mm is provided. The state core 11 is fixed on the inner circumferential surface of the bobbin 2 with its outer circumferential surface in contact with the inner circumferential surface of the bobbin 2, and the inner circumferential surface of the state core 11 is connected to the yoke plate cores 4a, 4b.
It is almost flush with the inner peripheral end surface of. Further, the length of the state core 11 is slightly shorter than the length of the pole core 9.

The inner circumferential end surfaces of the side plates 5a and 5b are formed to protrude slightly inward from the inner circumferential end surfaces of the yoke plate cores 4a and 4b, and this protruding portion serves as a stopper 5c for the side plate 5a. The side plate 5b has a stopper 5d. Here, the inner peripheral surfaces of the stoppers 5c, 5d and the ferrite magnets 7a, 7
The distance between b and the outer peripheral surface is approximately 0.5 mm.

The concave portions of the side plates 5a and 5b are provided with a right diaphragm stand 12a and a left diaphragm stand 1 made of approximately donut-shaped PBT, respectively.
2b are fitted to each other, and both ends of the support shaft 6 penetrate the center portions of the diaphragm stands 12a, 12b and protrude outward. As shown on the right side of FIG.
A casing member 13 made of PBT on which a diaphragm stand 12a is fixed.
and the casing member 13, there is a substantially disc-shaped
A diaphragm 14 made of EPDM is provided with its peripheral end fitted between the diaphragm stand 12a and the casing member 13. Further, the right end portion of the support shaft 6 passes through the center of the diaphragm 14, and center plates 15, 15 are provided on both sides of the diaphragm 14 to push and pull the diaphragm 14 to displace it left and right. The diaphragm 14 and the center plates 15, 15 are interposed between the mounting seat 16 and the nut 17, and are fixed on the right end of the support shaft 6 by being tightened by the nut 17.
The diaphragm 14 and the recess 13c of the casing member 13 define an operating chamber.

The casing member 13 is also provided with a suction port 13d communicating with the suction chamber 13a and a discharge port 13e communicating with the discharge chamber 13b. is provided with a suction valve 18, and a communication hole 13g provided in the partition wall between the working chamber and the discharge chamber 13b.
A discharge valve 19 is provided in the section.

In FIG. 1, the drawing of the configuration on the left side of the diaphragm stand 12b of the device of this embodiment is omitted, but this is completely symmetrical and the same as the configuration on the right side of the diaphragm stand 12a. . Note that the above-mentioned yoke core 3, yoke plate cores 4a, 4
b, state cores 5a, 5b, pole core 9 and magnetic shoes 8a, 8b, 8c, 8d,
It is made of laminated silicon steel plates with a thickness of 0.3 to 0.5 mm, and the electrical circuit is open so that they do not form internally continuous loops.

Next, the function and operation of the diaphragm pump of this embodiment will be explained.

When an alternating current is passed through the electromagnetic coil 1, N and S magnetic poles are alternately generated at both ends of the electromagnetic coil 1 in synchronization with changes in the alternating current. Therefore, the yoke plate cores 4a, 4 which are magnetic materials
b is also magnetized in synchronization with changes in the alternating current, and magnetic poles of different polarities appear alternately at the inner peripheral end of the yoke plate core 4a and the inner peripheral end of the yoke plate core 4b. That is, yoke plate core 4
Corresponding to the fact that the inner peripheral end of the yoke plate core 4b becomes the north pole or the south pole, the inner peripheral end of the yoke plate core 4b becomes the south pole or the north pole.

Here, if the inner circumferential end of the yoke plate core 4a is magnetized to the S pole during a half wave with alternating current, the inner circumferential end of the yoke plate core 4b is magnetized to the N pole; In this case, the S pole at the inner peripheral end of the yoke plate core 4a is attracted to the N pole of the magnetic shoe 8d magnetized by the ferrite magnet 7a, and the S pole of the magnetic shoe 8c magnetized by the ferrite magnet 7a is attracted. and exerts a repulsive interaction. Further, the N pole at the inner peripheral end of the yoke plate core 4b is repulsive with the N pole of the magnetic shoe 8a magnetized by the ferrite magnet 7b, and the S pole of the magnetic shoe 8b magnetized by the ferrite magnet 7b is repulsive. exerts an attractive interaction.
As a result, the vibrator 10 receives a force directed to the left,
Move to the left within the aforementioned movement range. Next, when the alternating current changes to the next half-wave between the half-waves, the inner circumferential end of the yoke plate core 4a is magnetized to the north pole, and at the same time, the inner circumferential end of the yoke plate core 4b becomes the south pole. Become magnetized. In this case, the magnetic poles at the inner peripheral ends of the yoke plate core 4a and the yoke plate core 4b are connected to the magnetic shoe 8.
c, 8d and the magnetic poles of the magnetic shoes 8a, 8b, the interaction is exactly opposite to that in the previous half-wave case, and the vibrator 10 moves to the right within the above-mentioned movement range.

By providing magnet shoes 8a, 8b, 8c, and 8d made of isotropic magnetic material, which is a feature of the present invention, ferrite magnets 7 are formed on the outer peripheral end surfaces of these magnets.
Most of the magnetic field lines generated by b, 7a are collected.

If the ferrite magnets 7a, 7b are not provided with the magnetic shoes 8a, 8b, 8c, 8d, both left and right end surfaces of the ferrite magnets 7a, 7b, which have magnetic anisotropy in the direction of the support shaft 6, An operating magnetic field in which lines of magnetic force are relatively dispersed is formed between the inner circumferential end surfaces of the yoke plate cores 4a and 4b. ,8b,8c,
8d, most of the magnetic lines of force pass through the outer peripheral end surfaces of the magnetic shoes 8a, 8b, 8c, and 8d through the insides of the magnetic shoes 8a, 8b, 8c, and 8d, and This is because an active magnetic field with a high magnetic flux density is formed between the inner circumferential end surfaces of the yoke plate cores 4a and 4b.
Furthermore, by providing the magnetic shoes 8a, 8b, 8c, and 8d, which are isotropic magnetic materials with a large magnetic permeability μ, the magnetic resistance of the magnetic circuit of which these are a part is reduced, and this However, for the same magnetomotive force of the electromagnetic coil 1, the magnet shoe 8
The magnetic flux density of the working magnetic field increases compared to the case where elements a, 8b, 8c, and 8d are not provided. Therefore, the magnetic poles on the inner peripheral end faces of the yoke plate core 4a and the yoke plate core 4b, the outer peripheral end faces of the magnetic shoes 8c and 8d, and the magnetic poles on the inner peripheral end faces of the yoke plate core 4a and the yoke plate core 4b,
The magnetic force acting between the magnetic poles on the outer peripheral end faces of a and 8b becomes very strong.

In this way, the vibrator 10 vibrates back and forth in the left-right direction in synchronization with the cycle of the alternating current, and in conjunction with this, the diaphragm 14 vibrates left and right. When the vibrator 10 moves to the left, the suction valve 18 opens while the discharge valve 19 remains closed, and the fluid sucked into the suction chamber 13a by the suction port 13b is transferred to the communication port 13f.
Then, when the vibrator 10 moves to the right, the suction valve 18 closes and the discharge valve 19 opens, allowing the fluid in the working chamber to flow through the communication port 13.
g, passes through the discharge chamber 13b, and is discharged from the discharge port 13e. Further, the same operation as described above is performed for the left side structure (not shown) of the diaphragm stand 12b, and in this way, the movable magnet type diaphragm pump of this embodiment is driven.

In this embodiment, ferrite magnets 7a, 7
Since b has anisotropy, it becomes a magnet with strong magnetic force even if it is thin, and the yoke plate cores 4a, 4b
Since the magnetic poles at the inner peripheral ends of the magnets strongly interact with the S poles of the magnetic shoes 8c and 8b, the force that causes the vibrator 10 to vibrate is also strong.

In addition, by making the vibrator 10 hollow to reduce its weight, the natural frequency of the vibrator 10 is made to match the frequency of the alternating current supplied to the electromagnetic coil 1 (in this embodiment, the frequency is set to the Kanto area and the Kansai area). 57Hz considering the AC frequency used in
The alternating change in the alternating current and the vibration of the vibrator 10 create a resonance state, and the pump is driven.

Since the state core 11 is provided, this becomes a path for the magnetic flux passing between the two poles of the electromagnetic coil 1, and since the thickness of the pole core 9 can be reduced, the weight of the vibrator 10 can be reduced.

Due to such strong vibration force and the reduced weight of the vibrator 10, the vibrator 10 vibrates almost in synchronization with changes in the alternating current.

In addition, yoke core 3, yoke plate core 4a,
4b, state core 11, pole core 9, and magnetic shoes 8a, 8b, 8c, and 8d have a thickness of
Since it is made of laminated silicon steel sheets with a thickness of 0.3 to 0.5 mm, it is possible to prevent the generation of eddy currents inside them, and since they themselves form an open circuit, secondary currents along the open circuit can be prevented. It is also possible to prevent the generation of current.

In addition, yoke core 3, yoke plate core 4a,
4b, state core 11, magnetic shoe 8
a, 8b, 8c, 8d, pole core 9 has Fe
A silicon steel plate with added Si is used, and this steel plate has the characteristics of low residual magnetization and low hysteresis loss, so that the magnetic circuit generated by passing an alternating current through the electromagnetic coil 1 is Energy loss is also reduced.

As a result, energy loss in the yoke core 3, yoke plate cores 4a, 4b, state core 11, magnetic shoes 8a, 8b, 8c, 8d, and pole core 9 is reduced, and heat generation is also reduced. can reduce heat generation.

Furthermore, if the diaphragm 14 is damaged due to deterioration of its material due to changes over time, the vibrator 10 moves beyond the above-mentioned suitable movement range of the vibrator 10, and the magnetic shoe 8d
The right side of the magnetic shoe 8a or the left side of the magnetic shoe 8a moves to the left of the stopper 5c or to the right of the stopper 5d. At the same time, the magnetic shoe 8d or the magnetic shoe 8a and the yoke yoke plate core 4a or the yoke plate core 4
The magnetic shoe 8d or 8a is attracted to the inner peripheral end surface of the yoke plate core 4a or 4b by the magnetic force between the magnetic shoe 8d and the magnetic shoe 8a, and the magnetic shoe 8d or the magnetic shoe 8a is attracted to the inner peripheral end surface of the yoke plate core 4a or the yoke plate core 4b, and the magnetic shoe 8d or the magnetic shoe 8a is attracted to the right side of the magnetic shoe 8d or the left side of the magnetic shoe 8a. The face is stopper 5
The vibration of the vibrator 10 is damped by being held by the stopper 5d.

This causes fluctuations in the discharge amount of the diaphragm pump, and an abnormality in the pump drive is detected.
By stopping the power supply to the electromagnetic coil 1, the drive of the pump can be stopped, and damage to the vibrator 10 and the like can be prevented.

Next, other embodiments of the present invention will be described.

FIG. 2 is a sectional view showing a main part of another embodiment of the diaphragm pump according to the present invention, which is provided with a magnetic shoe having a shape different from that of the first embodiment.
In FIG. 2, the same reference numerals as in FIG. 1 indicate the same or corresponding parts. In this embodiment, the outer peripheral end of the magnetic shoe is bent along the outer peripheral end surface of the ferrite magnet, and the yoke plate cores 4a, 4b of the support shaft 6 are bent like the embodiment shown in FIG. On both the left and right end surfaces of the ferrite magnets 7a' and 7b', which are fixedly fixed to the parts corresponding to the inner circumferential ends, are disk-shaped isotropic magnets with a thickness of 0.5 mm that are in contact with the left and right end surfaces, respectively. Magnet shoes 8a', 8b', which are made by laminating several silicon steel plates, which are magnetic materials,
8c' and 8d' are fixedly provided by appropriate means. And magnetic shoes 8a', 8b', 8c',
The peripheral ends of 8d' are ferrite magnets 7a' and 8d', respectively.
It is bent at right angles along and in contact with the outer peripheral end surface of ferrite magnet 7b', and is formed to extend slightly from the left or right end surface of each of ferrite magnets 7a' and 7b'.

Also, on the left side surface of the magnetic shoe 8c' and on the right side surface of the magnetic shoe 8b', there are a magnetic shoe 8e and a magnetic shoe similar to the magnetic shoes 8a', 8b', 8c', and 8d' in contact with these. A magnet shoe 8f is fixedly provided, and the peripheral end portions of the magnetic shoes 8e and 8f are bent inward at right angles so that these peripheral end surfaces approach the state core 11.

And magnetic shoes 8a', 8b', 8c', 8
The dimensions of the perpendicularly bent peripheral ends of d', 8e, and 8f are determined by design conditions such as the discharge capacity of the pump and the moving distance of the vibrator 10. It is necessary to prevent the peripheral end surfaces of the magnetic shoes 8c' and 8d' from being magnetically short-circuited. In this example, the dimensions of this peripheral edge are 1 to 1.
It is 3mm.

Due to such bending, the inner peripheral ends of the yoke plate cores 4a, 4b and the magnetic shoe 8
The distances from the outer peripheral ends of a', 8b', 8c', 8d' are much shorter than in the embodiment shown in FIG. 1, and the magnetic shoes 8a', 8b', 8c',
The magnetic path formed by 8d' becomes longer. With this, the yoke plate cores 4a, 4b
inner peripheral end and magnetic shoes 8a', 8b', 8c',
The magnetic force between the outer circumferential end of 8d' is increased, and the magnetic resistance of the magnetic circuit can be further reduced, so that the magnetic flux density within the magnetic circuit can be increased and the increase in the magnetic force can be further promoted.

Furthermore, in the diaphragm pump of this embodiment, since the pole core 9 unlike the embodiment shown in FIG. 1 is not provided, the weight of the vibrator can be further reduced. Although the embodiment shown in FIG. 2 shows the case where no pole core is provided, it is of course possible to provide a pole core without providing the magnetic shoes 8e and 8f.

FIG. 3 shows the case where the ferrite magnet of the above embodiment is not provided with a magnetic shoe, the case where a flat magnetic shoe as shown in FIG. 1 is provided, and the case where the ferrite magnet has a bent portion as shown in FIG. It shows the distribution of magnetic flux density around the ferrite magnet and the magnetic shoe when a magnetic shoe is provided. As can be seen from FIG. 3, the lines of magnetic force are concentrated at the peripheral edge of the magnetic shoe. In the case of a magnetic shoe with a bent part, the value of magnetic flux density is smaller than that of a flat magnetic shoe, but since the area of the high-density part is large, the number of lines of magnetic force is larger than that of a flat magnetic shoe. Therefore, a stronger repulsive force can be obtained.

In the diaphragm pump according to the present invention, when a flat magnetic shoe as shown in FIG. 1 is provided, the discharge capacity of the pump is 20 to 30% lower than when the ferrite magnet is not provided with a magnetic shoe. Furthermore, when a magnetic shoe having a bent portion as shown in FIG. 2 is provided, the pump's discharge capacity is further improved by 20 to 30% compared to the case where the flat magnetic shoe is provided.

Further, in the embodiment, anisotropic ferrite magnets 7a, 7b, 7a', 7 are used as the first and second magnets.
b′ is used, but the present invention is not limited to this, and other magnets such as rare earth magnets with strong magnetic force can be used.

Furthermore, yoke core 3, yoke plate cores 4a, 4b, state core 11, magnetic shoes 8a, 8b, 8c, 8d, 8a', 8b', 8c',
8d', the material of the pole core 9 is not limited to the silicon steel used in the embodiment described above, but state steel or the like may be used as long as it can reduce residual magnetization and hysteresis loss.

Furthermore, the values of the thicknesses of the yoke core 3, yoke plate cores 4a, 4b, etc. and the value of the movement range of the vibrator 10, etc., which are limited in the above embodiments, are not limited to the values of the above embodiments, and the pump Of course, this may vary depending on the capacity and other conditions.

[Effects of the Invention] As described above, according to the movable magnet diaphragm pump according to the present invention, the portions of the vibrator corresponding to the S and N poles of the electromagnetic coil have a short length in the axial direction of the vibrator and A first magnet and a second magnet with strong magnetic force are provided, and the polarities of the magnetic poles on opposing sides of these magnets are the same, and the first magnet and the second magnet are provided with a Since a magnet shoe is provided between the magnetic pole and each of the S pole and N pole of the electromagnetic coil to form an operating magnetic field with a large magnetic flux density, the four magnets of the first magnet and the second magnet Each of the magnetic poles makes a strong magnetic interaction with the S and N poles of the electromagnetic coil, and all of these effects exert a force on the vibrator in the same axial direction. Compared to the case where the two magnetic poles of one magnet in the vibrator interact with both poles of the electromagnetic coil, the vibrating force of the vibrator becomes much stronger, and it is necessary to use a longer magnet in the vibrator. By making the vibrator hollow or eliminating the central part, it is possible to reduce the weight of the vibrator, thereby achieving resonance between the alternating current of the alternating current applied to the electromagnetic coil and the vibration of the vibrator, thereby increasing the drive efficiency of the diaphragm pump. It has the effect of increasing

As a result, it is possible to obtain a vibration period of the vibrator that is approximately synchronized with the period of the alternating current flowing through the electromagnetic coil, and it is also possible to reduce the power consumption of the diaphragm pump.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view of a movable magnet type diaphragm pump according to an embodiment of the present invention, and FIG. 2 is a diaphragm pump according to the present invention which is provided with a magnetic shoe having a shape different from that of the above-described embodiment. FIG. 3 is a sectional view showing the main part of the embodiment, and FIG. 3 shows a ferrite magnet and a magnet shoe when the ferrite magnet is not provided with a magnetic shoe and when a magnetic shoe as shown in FIGS. 1 and 2 is provided. A diagram showing the distribution of magnetic flux density around Yu,
FIG. 4 is a partial sectional view of a conventional movable magnet diaphragm pump. (Main symbols in the drawing), 1: Electromagnetic coil, 7a,
7a': first magnet, 7b, 7b': second magnet, 8
a, 8b, 8c, 8d, 8a', 8b', 8c', 8
d': Magnetic shoe, 10: Vibrator.

Claims (1)

[Claims] 1. An electromagnetic coil, and an electromagnetic coil inserted into the electromagnetic coil,
A vibrator connected to a diaphragm and provided with a pair of permanent magnets is mounted, and a first permanent magnet and a second permanent magnet are attached to portions of the vibrator corresponding to the S and N poles of the electromagnetic coil. permanent magnets are provided spaced apart from each other, the polarity of the magnetic poles in the axial direction on opposite sides of both permanent magnets are the same, and a state made of a magnetic material is provided between the electromagnetic coil and the vibrator. In the diaphragm pump in which a core is interposed, the first permanent magnet and the second permanent magnet have a magnetic flux density between the magnetic poles of these permanent magnets and the S pole and N pole of the electromagnetic coil, respectively. A movable magnet diaphragm pump equipped with a magnetic shoe to generate a large active magnetic field. 2. The diaphragm pump according to claim 1, wherein the peripheral end of the magnetic shoe is bent so that the peripheral end surface of the magnetic shoe approaches the S pole or the N pole of the electromagnetic coil. 3. The diaphragm pump according to claim 1, wherein the magnetic shoe is flat.