JPH0424554B2 - - 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 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. An outline of such a diaphragm pump is shown in FIG.

In FIG. 2, 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 Fig. 2) are E-shaped, axially symmetrical cylindrical, 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]

In the conventional diaphragm pump, if the diaphragms 26a and 26b are damaged during operation due to deterioration of their materials over time, the vibrator 23 comes into contact with the yoke 21, etc., and the vibrator 23 or the yoke is damaged. There is a problem that 21 etc. are damaged. In such a case, a mechanical limit switch or optical sensor is used to detect abnormal vibrations of the vibrator caused by damage to the diaphragm or other causes, and to stop the power supply to the electromagnetic coils 22a and 22b, thereby eliminating the vibration. There are ways to prevent damage to children, etc.

However, in the method using a mechanical limit switch, when the vibration range of the vibrator 23 slowly shifts due to deterioration of the diaphragm, the displacement detection section of the limit switch detects the vibration of the vibrator 23.
Before abnormal displacement can be detected, the vibrator 23 is likely to be damaged by a large number of vibration shocks caused by minute displacement vibrations (3600 times/min), and the detection accuracy of abnormal vibration is likely to deteriorate. There is a problem in that damage to the child 23 and the like cannot be sufficiently prevented, and in the method using an optical sensor, there is a problem in that the abnormal vibration detection device becomes expensive.

The present invention has been made in order to solve the above-mentioned problems, and is a movable device that uses a stopper to stop the abnormal vibration of the vibrator when it occurs, thereby preventing damage to the vibrator, etc. The purpose is to provide a magnetic diaphragm pump.

[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 inserted into the electromagnetic coil, connected to the diaphragm, and provided with a magnet, the vibration A stopper is provided to suppress the vibration of the vibrator when the vibration of the vibrator becomes abnormal. This stopper is
The inner peripheral end surface of the side plate provided on the right end surface and the left end surface of the yoke plate core, which is provided in contact with the bobbin provided on the inner peripheral surface and both end surfaces of the electromagnetic coil, is in contact with the inner peripheral surface of the yoke plate core. It is formed to protrude inward from the peripheral end surface.

〔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. 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. A bobbin 2 made of 66 nylon is provided, which has a thickness of 2 to 3 mm and has U-shaped upper and lower halves in longitudinal section. On both the left and right end surfaces of the bobbin 2, a right yoke plate core 4a and a left yoke plate, which are made of laminated several donut-shaped silicon steel plates with a thickness of 0.5 mm, are placed in contact with these. A core 4b is fixedly installed. 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 right-hand ferrite magnet 7a and a left-hand ferrite magnet 7b are fixedly provided at portions corresponding to the inner circumferential ends of b 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 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. And the left side of each of the ferrite magnets 7a and 7b,
On both right end faces, in contact with this, there is a magnet shoe 8 made of several laminated disc-shaped silicon steel plates, which are isotropic magnetic materials and have a thickness of 0.5 mm.
a, 8b, 8c, and 8d are fixedly provided by appropriate means. 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.
Similarly, the right end surface of the rightmost magnet shoe 8d 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. Here, 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 area of the inner peripheral end surface of the yoke plate core 4a or the yoke plate core 4b.
The outer peripheral surface of the state core 11 is the bobbin 2.
The state core 11 is fixed on the inner circumferential surface so as to be in contact with the inner circumferential surface of the state core 11, and the inner circumferential surface of the state core 11 is substantially flush with the inner circumferential end surfaces of the yoke plate cores 4a, 4b. 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 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.

Note that the magnet shoes 8a, 8 made of isotropic magnetic material
By providing magnets b, 8c, and 8d, most of the lines of magnetic force generated by the ferrite magnets 7b and 7a are collected at the peripheral ends of these magnets, so that the magnetic poles and magnets at the inner peripheral ends of the yoke plate core 4a and the yoke plate core 4b are The magnetic force acting between the shoes 8c, 8d and the magnetic poles of the magnet shoes 8a, 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). (The alternating current frequency is set at 57 Hz in consideration of the AC frequency used in the pump.) The alternating change in the alternating current and the vibration of the vibrator 10 create a resonance state, and the pump is driven.

And by providing the state core 11,
By using this as the main path for the magnetic flux passing between the two poles of the electromagnetic coil 1, the thickness of the pole core 9 can be reduced, and therefore 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 cores 5a, 5b, pole core 9, and magnetic shoes 8a, 8b, 8c, and 8d are made of laminated thin silicon steel plates with a thickness of 0.3 to 0.5 mm, so eddy currents occur inside them. It is possible to prevent the occurrence of secondary current along the open circuit, since these themselves are an open circuit.

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 containing Si is used, and this steel plate has the characteristics of low residual magnetization and low hysteresis loss. 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. The heat generation can also be reduced.

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 diaphragm 14 will move to the right side of the magnetic shoe 8d. The left side surface 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 vibrator 10, whose center axis was held at the center of the yoke plate cores 4a, 4b by the diaphragm 14, was moved to the center of the yoke plate cores 4a, 4b due to the breakage of the diaphragm 14. Off-center, the magnetic shoe 8d or 8a of the vibrator 10 approaches the yoke plate core 4a or the yoke plate core 4b. At this point, according to Coulomb's law, magnetic shoe 8d or magnetic shoe 8
The magnetic force between a and yoke plate core 4a or yoke plate core 4b becomes stronger, and almost at the same time as an abnormality occurs, magnetic shoe 8d or magnet shoe 8a moves to the inner periphery of yoke plate core 4a or yoke plate core 4b. It is adsorbed to the end surface. Then, the right side of the magnetic shoe 8d or the left side of the magnetic shoe 8a is the 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.

In the above embodiment, 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, or stoppers 5c, 5d may be provided. The position is also not limited to the position of the above embodiment. 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.

The stopper according to the present invention provided in a diaphragm pump is not limited to the diaphragm pump of the type described in the above embodiment, but is generally made up of an electromagnetic coil and a vibrator having a magnet provided therein. Of course, it can be applied to a movable magnet type diaphragm pump.

Furthermore, the materials of the yoke core 3, yoke plate cores 4a, 4b, state core 11, magnet shoes 8a, 8b, 8c, 8d, and pole core 9 are not limited to the silicon steel of the above embodiment, and the residual magnetization is reduced. State steel can also be used as long as it is possible and can reduce 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.

〔Effect of the invention〕

As described above, according to the movable magnet diaphragm pump according to the present invention, when the vibrator starts to vibrate abnormally due to damage to the diaphragm, the vibration of the vibrator is stopped by the stopper, and the pump drive is stopped. Since an abnormality can be detected, the power supply to the electromagnetic coil can be immediately stopped to stop driving the pump, which has the effect of preventing damage to internal parts of the diaphragm pump such as the vibrator.

[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, and FIG. 2 is a partial sectional view of a conventional movable magnet diaphragm pump. (Main symbols in the drawing), 1: Electromagnetic coil, 5c,
5d: Stopper, 10: Vibrator, 14: Diaphragm.

Claims (1)

[Claims] 1 an electromagnetic coil; inserted into the electromagnetic coil;
A diaphragm pump equipped with a vibrator connected to a diaphragm and provided with a magnet, the yoke plate being provided in contact with a bobbin provided on the inner peripheral surface and both end surfaces of the electromagnetic coil. The inner peripheral end faces of the side plates provided on the right end face and the left end face of the core are formed to protrude inwardly from the inner peripheral end face of the yoke plate core, and the vibration of the vibrator becomes abnormal vibration. A movable magnet type diaphragm pump characterized in that it comprises a stopper that suppresses the vibration of the first half vibrator.