JPH0424555B2 - - 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 that is 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 and garden pond fish farming, and for sampling test gas in pollution monitoring.

[Conventional technology]

Conventionally, this type of diaphragm pump is described in Japanese Patent Application Laid-Open No. 84603/1983. A schematic diagram of such a diaphragm pump is shown in FIG.

In FIG. 3, 21 is a yoke, and its upper half and lower half (hereinafter referred to as
In the [Prior Art] section, the top, bottom, left, and right are those shown in Figure 3) are E-shaped, axially symmetrical cylinders, and the central axis is hollow. . Further, as the material of the yoke 21, a ferromagnetic material such as Fe is used. The right half and the left half of the yoke 21 are provided with yoke 2, respectively.
A cylindrical electromagnetic coil 22 having a doughnut-shaped cross section and having the same central axis as the yoke 21 and in contact with the inner surface of the yoke 1.
a, 22b are provided. and yoke 21
A cylindrical vibrator 23, which is slightly shorter than the yoke 21, is provided along the longitudinal direction of the yoke 21 in the center of the yoke 21, so that the central axis is the same as that of the yoke 21, and the right and left ends of the vibrator 23 are connected to the yoke. 21, extending to near the right and left ends.
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, 27 are
b is fixed. Further, the vibrator 23 is fixed, and a diaphragm 26 is attached to both ends of a support shaft 25 formed along the central axis of the vibrator 23.
a and 26b are fixed.

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. 2 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.

[Problem that the invention seeks to solve]

However, in the conventional diaphragm pump, the magnetic pole pieces 27 are fixed to both end surfaces of the yoke 21 and the permanent magnet 24.
Since solid materials (massive or solid materials) are used for a and 27b, the yoke 2
There was a problem in that eddy currents or secondary currents were generated in the magnet 1 and the magnetic pole pieces 27a and 27b, resulting in heat generation.

The present invention has been made in order to solve the above problems, and the yoke 2 provided in the magnetic circuit generated by energizing the electromagnetic coil.
It is an object of the present invention to provide a movable magnet type diaphragm pump that can prevent eddy currents and secondary currents from occurring in a magnetized body such as 1 and the like, thereby preventing the magnetized body from generating heat.

[Means for solving problems]

The movable magnet diaphragm pump of the present invention is a diaphragm pump equipped with an electromagnetic coil and a vibrator that is inserted into the electromagnetic coil, connected to the diaphragm, and provided with a magnet. The magnetic circuit generated by energizing the coil has a cylindrical cross section with an arbitrary shape, and is made by laminating thin plates made of magnetic material spirally wound, or C-shaped cross section made of magnetic material. It is characterized in that it is made of a laminated thin plate of and is provided with a magnetized body whose structure is electrically open circuit with respect to the induced current generated by a change in the magnetic flux of the magnetic circuit. .

〔Example〕

Hereinafter, the present invention will be explained based on drawings showing embodiments thereof.

FIG. 1 is a partial cross-sectional view of a movable magnet type diaphragm pump with a discharge rate of about several tens of minutes per minute, showing an embodiment of the present invention. 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. Then, around the outer periphery of the electromagnetic coil 1, a thin plate of silicon steel plate with a thickness of 0.3 mm, which is a thin plate made of a magnetic material, is wound in a spiral shape so as to cover the electromagnetic coil 1 and share the same central axis. A cylindrical yoke core 3 with a thickness of about 1 mm made of
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
On both the left and right end faces of the right yoke plate core 4a, which is in contact with these, is a right yoke plate core 4a made of laminated several silicon steel plates, which are thin plates made of magnetic material with a doughnut plate shape and a thickness of 0.5 mm. A left yoke plate core 4b is fixed. 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. and the right side of side plate 5a and side plate 5b
On the left side are the yoke plate cores 4a, 4b with inner diameter
A recess slightly smaller than the outer diameter of the recess is formed.

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 ferrite magnet 7a, which is a first magnet on the right side, and a ferrite magnet 7b, which is a second magnet on the left side, each having a short cylindrical shape are located in the portion corresponding to the inner peripheral end of b.
is fixedly provided by appropriate means. The center axis of the ferrite magnets 7a and 7b is the support shaft 6.
coincides with the central axis of Furthermore, the polarities of the magnetic poles on 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. On both the left and right end surfaces of each of the ferrite magnets 7a and 7b, in contact with the left and right end faces of each of the ferrite magnets 7a and 7b, there is a disc-shaped thin plate made of a magnetic material, and a 0.5 mm thick isotropic magnetic material. Magnetic shoes 8a, 8b, 8c, and 8d each made of several laminated silicon steel plates are fixedly provided by appropriate means. The left end surface of the magnetic shoe 8a provided at the leftmost end is approximately 10 mm to the left of the left end surface of the yoke plate core 4b.
It is braked by appropriate means so that it can move within a range of mm, and the right end surface of the rightmost magnet shoe 8b is similarly
It can be moved to the right within a range of approximately 10mm from the right end surface of the At the same time, the right end surface of the magnetic shoe 8b can be moved to the right within a range of about 14 mm from the left end surface of the yoke plate core 4b, and the left end surface of the magnetic shoe 8c is movable to the right end surface of the yoke plate core 4a. It is now possible to move to the left within a range of approximately 14mm.

Between the magnetic shoes 8b and 8c, the central axis coincides with the central axis of the support shaft 6, and the thickness of the thin plate made of magnetic material is 0.3.
A cylindrical pole core 9 is provided which has a total thickness of about 1 mm by spirally winding a thin silicon steel plate of 1 mm in diameter, and the left and right end surfaces of the pole core 9 are connected to magnetic shoes 8b, respectively. It is in contact with the right end surface 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. Then, the support shaft 6, ferrite magnets 7a, 7b, and magnetic shoe 8a,
Vibrator 1 from 8b, 8c, 8d and pole core 9
0 is configured. In addition, between the pole core 9 and the bobbin 2 and approximately in the center of the bobbin 2, there is a silicon steel plate with a thickness of 0.3 mm, which is a thin plate made of magnetic material and whose central axis coincides with the central axis of the support shaft 6. A cylindrical state core 11 is provided which is spirally wound and has a total thickness of about 2 mm. Here, the value of the sum of the cross-sectional area of the state core 11 and the cross-sectional area of the pole core 9 substantially matches the value of the area of the inner peripheral end surface of the yoke plate core 4a or the yoke plate core 4b. and 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 state core 1
The inner circumferential surface of yoke plate core 1 is substantially flush with the inner circumferential end surfaces of yoke plate cores 4a and 4b. Further, the length of the state core 11 is slightly shorter than the length of the pole core 9.

The yoke core 3, the pole core 9, and the state core 11 are provided in the magnetic circuit of the electromagnetic coil 1 and serve as magnetized bodies in the present invention.

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 seal members 15, 15 are provided on both sides of the diaphragm 14 to seal the through hole bored in the center of the diaphragm 14. There is. And these diaphragm 14 and seal member 1
5 and 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. .

In this embodiment, the aforementioned yoke core 3, yoke plate cores 4a, 4b, state core 11,
Pole core 9 and magnetic shoes 8a, 8
b, 8c, and 8d are laminated silicon steel plates with a thickness of 0.3 to 0.5 mm, which are thin plates made of magnetic material, and are designed in electrical circuits so that they do not form continuous internal loops. It is in an open state. The thickness of the steel plate is preferably 0.3 to 0.5 mm, and if it is less than 0.3 mm, there is a problem that the workability of manufacturing the state core 11 etc. becomes poor and the material cost increases.
On the other hand, if it exceeds 0.5 mm, the magnetic flux generated in the state core 11 etc. by applying alternating current to the electromagnetic coil 1 changes alternately, which generates eddy currents and generates a large amount of heat. There is a problem with becoming.

FIG. 2 is a schematic perspective view of the state core 11 used in the device of this embodiment, and the thickness is 0.3 mm.
The thin plates made of silicon steel plates are spirally wound and stacked to create an open electrical circuit. In this case, the ends 31 of the outermost layer of the spiral are insulatively bonded by appropriate means such as adhesive, and the secondary current flowing through the spiral thin plate can also be prevented, so it is preferable to use a thin plate. This is more effective in preventing the generation of eddy currents. And regarding yoke core 3 and pole core 9,
These have the same structure as the state core 11 described above.

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 exert a repulsive interaction. Further, the N pole at the inner peripheral end of the yoke plate core 4b has a repulsive force with the N pole of the magnet shoe 8a magnetized by the ferrite magnet 7b, and an attractive force with the S pole of the magnet shoe 8b magnetized by the ferrite magnet 7b. interact with each other. As a result, the vibrator 10 receives a leftward force and moves to the left within the above-mentioned 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. Note that by providing the magnet shoes 8a, 8b, 8c, and 8d made of isotropic magnetic material, most of the lines of magnetic force generated by the ferrite magnets 7b and 7a are collected at the peripheral ends of these magnets.
The magnetic poles at the inner peripheral ends of the yoke plate core 4a and the yoke plate core 4b and the magnetic shoe 8c,
The magnetic force acting between the magnet 8d and the magnetic poles of the magnet shoes 8a and 8b becomes extremely 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 electrode coil 1 (in this embodiment, the frequency is set to the Kanto region and the Kansai region). The frequency is set to 57Hz in consideration of 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, magnetic shoe 8
a, 8b, 8c, 8d and pole core 9
A silicon steel plate with Si added to Fe is used.
The steel plate has the characteristics of low residual magnetization and low hysteresis loss, so the electromagnetic coil 1
The loss of energy within the magnetic circuit caused by passing an alternating current through the magnetic circuit also becomes smaller.

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. It can also reduce its own heat generation.

Furthermore, if the diaphragm 14 is damaged due to deterioration of its material due to changes over time, the vibrator 10 will move beyond the above-mentioned proper movement range of the vibrator 10, and the right end of the magnetic shoe 8d will be damaged. Alternatively, the vibration of the vibrator 10 is damped by hooking the left end of the magnetic shoe 8a to the left side surface of the stopper 5c or the right side surface of the stopper 5b. This causes abnormalities such as fluctuations in the discharge amount of the diaphragm pump, and upon detecting this abnormality, the energization to the electromagnetic coil 1 is stopped and the vibrator 1
Damage such as 0 can be prevented.

In the above embodiment, the yoke core 3, the pole core 9, and the state core 11, which are magnetized bodies, have a structure in which thin plates made of magnetic material are spirally wound and stacked. As long as the magnetized body has an open circuit, it is not limited to the structure described above,
For example, it may have a C-shape with a ring-shaped cross section and a portion thereof cut off, and may be made of laminated thin plates made of cylindrical magnetic material.

Further, in the embodiment described above, anisotropic ferrite magnets 7a and 7b were used as the first and second magnets, but the present invention is not limited thereto, and other magnets such as rare earth magnets with strong magnetic force may also be used.

Also, the bobbin 2, side plates 5a, 5b, diaphragm stands 12a, 12b, casing member 1
The materials for the diaphragm 14 and the diaphragm 14 are not limited to those used in the above embodiments, but ABS, PET, etc. can also be used as long as they have heat resistance.

Further, in the embodiment, the stopper 5c,
5d is shown as being continuously formed integrally with the side plates 5a, 5b, but it may be formed separately from the side plates 5a, 5b. Further, the material of the stoppers 5c and 5d is not limited to the same material as that of the side plates 5a and 5b in the embodiment described above, but PET, ABS, etc. can be used as long as they are heat-resistant non-magnetic materials.

In addition, yoke core 3, yoke plate core 4a,
4b, state core 11, magnetic shoe 8
The materials for the pole cores 9a, 8b, 8c, 8d, and pole core 9 are not limited to the silicon steel used in the embodiments described above, but state steel or the like may be used as long as the residual magnetization can be reduced and the hysteresis loss can be reduced.

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.

〔Effect of the invention〕

According to the movable magnet diaphragm pump of the present invention, the magnetized body provided in the magnetic circuit generated by the electromagnetic coil has a cylindrical shape with an arbitrary cross section, and the thin plates made of magnetic material are laminated. and is electrically open circuit with respect to the induced current generated by changes in the magnetic flux of the magnetic circuit, so that it is possible to prevent the generation of eddy current inside the magnetized body. 2 along the open circuit
It is possible to prevent the generation of a secondary current, which has the effect of suppressing heat generation of the magnetized body and reducing wasteful power consumption due to heat generation.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view of a movable magnet diaphragm pump according to an embodiment of the present invention, FIG. 2 is a schematic perspective view of the state core of the movable magnet diaphragm pump of this embodiment, and FIG. 3 is a conventional It is a partial sectional view of a movable magnet type diaphragm pump. (Main symbols in the drawing), 1: Electromagnetic coil, 10:
Vibrator, 7a, 7b: magnet, 3, 9, 11: magnetized body, 14: diaphragm.

Claims (1)

[Claims] 1 an electromagnetic coil; inserted into the electromagnetic coil;
A diaphragm pump that is connected to a diaphragm and is equipped with a vibrator provided with a magnet, the diaphragm pump having a cylindrical shape with an arbitrary cross section in a magnetic circuit generated by energizing the electromagnetic coil. It is made of thin plates made of magnetic material wound spirally and laminated, or thin plates made of magnetic material with a C-shaped cross section are laminated, and the induction occurs due to changes in the magnetic flux of the magnetic circuit. A movable magnet diaphragm pump comprising a magnetized body whose structure is electrically open-circuited to current.