JPS63227978A - Stator core of movable magnet type diaphragm pump - Google Patents

Abstract

PURPOSE:To improve the pumping efficiency by increasing the inside diameter at the both edges of a stator core consisting of a magnetic body which is interposed between an electromagnetic coil and a vibrator element and forming the both edge parts thinner than other parts, thus preventing the contact with a magnet shoe. CONSTITUTION:When an ac current flows in an electromagnetic coil 1, the magnetic poles having different polarity are alternately generated at the inner peripheral edges of the yoke plate cores 4 and 4' as magnetic bodies. A slider 9 is moved in reciprocation laterally according to the attractive force and repulsive force of the magnetic poles at the inner peripheral edges of the yoke plate cores 4 and 4' and the magnet shoes 7a-7c and 7a'-7c' magnetized by the magnets 5 and 5'. Therefore, the diaphragms 11 and 11' are vibrated laterally, and discharge valves 17 and 17' and suction valves 16 and 16' are opened and closed. With such constitution, a stator core 8 consisting of a magnetic body which is interposed between the electromagnetic coil 1 and the vibrator element 9 is formed so as to have the increased inside diameter at the both edge parts which is thinner than other parts.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a thin-walled state core at both ends of 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. , is a state core provided in a movable magnet diaphragm pump that sucks fluid and then discharges it in conjunction with the state core, and thin-walled portions are provided at both ends of the state core, so that when the vibrator moves back and forth, the state core There is no adsorption or contact with the magnetic shoe installed on the pump, and magnetic force is effectively applied in the axial direction up to the top dead center and bottom dead center of the image, improving pump performance. Regarding state core. In addition, here, top dead center and bottom dead center mean, taking the right diaphragm (see Figure 1) as an example, the time when the vibrator moves to the right is the top dead center, and the time when it moves to the left is the top dead center. Let be the bottom dead center.

A movable magnet diaphragm pump to which the state core of the present invention is applied is mainly used for oxygen supplementation in fish tanks, garden ponds, or human waste septic tanks, or for sampling test gas in pollution monitoring.

[Prior Art] Conventionally, there is a movable magnet type diaphragm pump described in Japanese Patent Application Laid-Open No. 54-84603 (see FIG. 9).

Such a diaphragm pump reciprocates the vibrator in its axial direction by magnetic interaction between the inner peripheral end of the cylindrical yoke and the N and S magnetic poles generated at both ends of the vibrator. It is. N and S in FIG. 9 indicate the polarity of the magnetic pole appearing at the inner peripheral end of the yoke (211) during a half-wave of alternating current. In this case, the oscillator is moved to the right. , (N), and (S), and the vibrator is moved to the left.In this way, the vibrator vibrates left and right in synchronization with the cycle of the applied alternating current. diaphragm (26
a) and (26b) are also photographed. and the diaphragm (
26a) and the left side of the diaphragm (26b), regular pressure fluctuations are applied to the fluid in the working chamber (not shown), the fluid is drawn into the working chamber, and the fluid is discharged outside the working chamber. By discharging , the diaphragm pump functions as a pump.

However, in the conventional diaphragm pump, it is necessary to increase the permeance coefficient of the permanent magnet Q4, which is made of a cast magnet or the like attached to the support shaft, in order to increase the residual magnetic flux. In addition, permanent magnets are used to strengthen the magnetic force between the magnetic poles generated at the inner peripheral edges of the yoke (two left and right ends) and the permanent magnets (24 S and N poles). On the left end surface and right end surface of Q4,
Since the magnetic pole pieces (27a) and (27b) are provided, the weight of the vibrator becomes very large.

Therefore, the natural frequency of the vibrator, which is determined by the design conditions of the diaphragm or the weight of the vibrator, cannot be made to match the frequency of the alternating current flowing through the electromagnetic coils (22a) and (22b). There is a problem in that the alternating current change and the imaging of the vibrator are in a resonance state, so that the discharge capacity of the diaphragm pump cannot be rapidly increased, and the driving efficiency of the diaphragm pump is poor.

In order to effectively solve the above-mentioned problems, the present applicant has proposed a method that corresponds to the S pole and Nl of the electromagnetic coil in the vibrator, as already described in Japanese Patent Application No. 61-208423. We proposed a movable magnet diaphragm pump with two separate ferrite magnets with the same polarity on opposite sides, and further applied for
As described in No. 2-8380 Mei Il1, an active magnetic field with a large magnetic flux density is formed between the electromagnetic coil and the magnet, thereby increasing the imaging power of the vibrator and making it possible to increase the discharge volume of the pump. We are proposing a diaphragm pump equipped with a magnetic shoe.

[Problems to be Solved by the Invention] However, even the method described in the specification of Japanese Patent Application No. 62-8380 has the following problems.

Figures 10 and 11 show the right half of the vibrator (109) and state core (108,) and the right diaphragm (
111), in which the yoke plate core, side plates, etc. are omitted for simplicity. (107a), (107b), and (107C) are magnet shoes made of isotropic magnetic material such as silicon steel plate, and as shown in Figures 10 and 11, they increase the magnetic flux density in the magnetic circuit. The ferrite magnet (105) is fixed to the ferrite magnet (105) with its peripheral edge bent in order to increase the ferrite magnet (105).

The vibrator (109) in Fig. 10 is not moving to the right or left; it is in a neutral state, and the core of the vibrator (109) and the core of the state core (108) almost coincide. in a state. When the electromagnetic coil is energized to vibrate the vibrator (109) from side to side, an axial force (FL') is generated by the magnetic fluxes (Ao), (Bo), and (Co) as shown in Figure 10. However, the magnet shoe (107a) comes to be drawn into the state core (108). In the above description, it is assumed that the polarity S first appears at the right end of the state core (108) upon energization.

Thereafter, with the passage of time (time within a half wave with alternating current), the vibrator (1091 is the axial force (FL')
The state core gradually moves to the left due to the action of
108) and the magnetic shoe (107a) begin to overlap, the force due to the magnetic fluxes of (Ao), (Bo), and (Co) is applied to the magnetic shoe (107a) as shown in (Fv').
is changed into a force that attracts the state core (108). So(
) The lever force (Fv') gradually increases as the vibrator (109) moves to the left. In such a case, the core of the vibrator (109) and the core of the state core (108) are completely aligned, and the force of the rubber diaphragm supporting the vibrator (109) is in all directions, that is, IIi! 3 for the axis (106) of the mover (109)
There would be no problem if the cores were equal in all 60° directions, but in reality it is very difficult to match the cores perfectly and to obtain a completely homogeneous diaphragm.

As a result, the rubber diaphragm that supports the central position of the vibrator (109), that is, the magnet shoe (107a), becomes sagging in one area, and the opposite side thereof is stretched, causing deviation.

Even if the magnet shoe (107a) is not attracted to the state core (108) even in this biased state at the beginning of operation, as the operation continues, the bias is amplified and finally The adsorption force becomes larger than the tensile strength of the rubber, and the magnet shoe (107a) comes into contact with and adsorbs to the state core (108).

When the vibrator (109) has moved to the maximum, the tensile strength of the rubber is large, so the vibrator (109) moves against the adsorption force.
109) can be supported in the center position,
When the diaphragm (111) is near the neutral state,
Since rubber has a low tensile strength, even a slight adsorption force can cause the diaphragm to shift.

And, as mentioned above, the magnetic shoe (107a)
If it comes into contact with the state core (108), the horizontal vibration of the vibrator (109) will be restricted, and the performance of the pump, that is, the discharge capacity will be significantly reduced. Furthermore, a problem arises in that impact noise and imaging occur, and the magnet shoe (107a) and state core (108) are eventually damaged, rendering the pump useless as a pump.

In order to prevent the above-mentioned inconvenience, the difference between the inner diameter of the state core and the outer diameter of the magnet shoe can be increased to reduce the attraction force, but this will weaken the magnetic attraction force that acts on each other. Another problem arises in that the performance of the ribbon whose vibrating force is small is significantly reduced.

The present invention was made to solve the above-mentioned problems, and it not only prevents contact between the magnet shoe and the state core, but also prevents contact between the magnet shoe and the state core. It is an object of the present invention to provide a state core that can effectively apply magnetic force in the axial direction during the process.

[Means for Solving the Problems] The state core of 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 magnet. is attached, and the polarities of the magnetic poles on opposite sides of the first magnet and the second magnet provided in the portions of the vibrator corresponding to the S and N poles of the 'R electromagnetic coil are the same. A cylindrical state core made of a magnetic material that is interposed between the electromagnetic coil and the vibrator of a diaphragm pump, and is configured such that both ends thereof have a larger inner diameter and are thinner than other parts. It is characterized by being done.

Embodiments] Next, the state core of the present invention will be described based on drawings showing embodiments thereof.

FIG. 1 is a partial sectional view of a movable magnet type diaphragm pump with a discharge rate of about 10 j/min, which is provided with an embodiment of the state core of the present invention.

In FIG. 1, (1) is 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. Part 1! On the outer periphery of the magnetic coil (1), a cylindrical yoke core (
3) is provided.

On the inner circumferential surface of the electromagnetic coil (1) and on both end surfaces of the left and right sides shown in Figure 1 (hereinafter left, right, top, and bottom refer to those in Figure 1), there are longitudinal sections in contact with this. A bobbin ('2J) is provided whose upper and lower halves are U-shaped. On both the left and right end faces of the bobbin (a), donut plate-shaped The yoke plate core (4) on the right side and the yoke plate core (4°) on the left side are fixed.The yoke plate cores (4) and (4°) are placed slightly toward the center axis from the inner peripheral surface of the bobbin (2). A support shaft (6) of a vibrator (described later), which is formed to extend in the direction of the central axis, is provided at the center shaft of the I! electromagnetic coil 1). The yoke plate (4
) and (4°), a short cylindrical first magnet (5) on the right side and a second magnet (5°) on the left side are fixed by appropriate means. ing.

The central axes of the first magnet (5) and the jf12 magnet (5°) are aligned with the central axis of the support shaft (6). Furthermore, the first
The polarities of the magnetic poles on opposing surfaces of the magnet (5) and the second magnet (5') are both S-polarity, and therefore the polarities of the magnetic poles on these opposite surfaces are N-pole. and the first
On both the left and right end surfaces of the magnet (5) and the second magnet (5'), in contact with these, there is a disk-shaped silicon magnetic material with a thickness of 0.5 m+. Magnet sheets made of several laminated steel plates: x - (7a), (7b
), (7C), (7a'), (7b'), (7c')
is fixedly provided by appropriate means.

The outer peripheral end of the magnet shoe is bent along the outer peripheral end surface of the ferrite magnet.

Suna Wachima lj net shoe (7b), (7c), (
The peripheral ends of the ferrite magnets (5) and (7c') are bent at right angles along and in contact with the outer peripheral end surfaces of the ferrite magnets (5) and (5°), respectively. (
5"), and is formed to extend slightly from the left end surface or right end surface of each.

Also, on the left side of the magnet shoe (7b) and on the right side of the magnet shoe (7b'), there are magnet shoes (7b), (IC), (7b') in contact with these.
, (7c') are fixedly provided, and the peripheral end surfaces of the magnetic shoes (7a) and (7b) are connected to the state core. It is bent inward at a right angle so as to approach (8).

Magnet shoe (7a), (7b), (IC), (
The dimensions of the perpendicularly bent peripheral ends of 7a'), (7b'), and (7c') are based on the discharge capacity of the pump and the vibrator (9).
), but the circumferential end surfaces of the magnet shoe (7b) and the magnet shoe (7C), and the circumferential end surfaces of the magnet shoe (7b') and the magnet shoe (7C') should not be magnetically short-circuited. It is necessary to In this example, the dimension of this peripheral edge is 1
~3m1m.

Due to such bending, the yoke plate core (4), (
4°) inner peripheral edge and magnetic shoes (7b), (7C)
, (7b'), (7c') are shorter than when the magnet shoe is flat, and the distance from the outer peripheral edge of the magnet shoe (7c'), which is an isotropic magnetic material, is shorter than when the magnet shoe is flat.
The magnetic path formed by b), (7C), (7b') and (7C') becomes longer. As a result, the inner peripheral ends of the yoke plate cores (4), (4゛) and the magnet shoes (7b), (7C), (7b"), (7c'
) 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 magnetic force can be increased. A gap of approximately 11IIIR to 3#Im is formed between the outer peripheral surface of the magnet shoe and the inner peripheral surface of the yoke plate core (4) (4°). Then, the support shaft (6), the first and second magnets (5), (5゛), and the magnet shoe (i
'a), (1b), (7C), (7a'), (7b'
) and (7c') constitute a vibrator (K)l. Further, a cylindrical state core (8) is provided on the inner periphery of the bobbin (2) at approximately the center thereof, with its center axis coinciding with the center axis of the support shaft (6). The state core (8) 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).
The inner circumferential surfaces of the yoke plate cores (4) and (4') are substantially flush with the inner circumferential end surfaces of the yoke plate cores (4) and (4'). (To), (10°) are diaphragm stands that support the diaphragm (Ill, (11°). Both ends of the support shaft "(6) are diaphragm stands ■
, (10') and protrudes outward. There is a suction seedling (f2a) on the right end of the white diaphragm.
A casing member 0Z in which a discharge chamber (12b) and a recess (12C) are formed is fixed, and a suction chamber (12a"), a discharge chamber (12tl') and a A casing member (12°) in which a recess (12c') is formed is fixed.

A diaphragm 01 made of approximately disk-shaped EPDH is provided between the diaphragm stand η and the casing member (+21), with its peripheral end fitted between the white diaphragm and the casing member 0. Also, diaphragm 0
The right end portion of the support shaft (6) passes through the center of 1), and a center plate 0 is provided on both sides of the diaphragm 01) to push and pull the diaphragm 0η to displace it left and right. These diaphragms (former) and center plate [F] are installed between the seat (141) and the nut 6, and are fixed on the right end of the support shaft (6) by being tightened by the nut 6. ing.

A working chamber is formed by the diaphragm 01) and the recess (12c) of the casing member (12).

The casing member 0z is provided with a suction port (12d) communicating with the suction chamber (12a) and a discharge port (12e) communicating with the discharge chamber (12b).
A suction valve Oe3 is provided in the communication hole (12f) provided in the partition between the working chamber and the discharge chamber (12b), and a communication hole (12g) provided in the partition between the working chamber and the discharge chamber (12b) is provided with a suction valve Oe3. is provided with a discharge valve port.

The configuration on the left side of the diaphragm stand (10') is completely symmetrical and the same as the configuration on the right side of the diaphragm stand QOI.

Next, the function and operation of the diaphragm pump shown in FIG. 1 will be explained.

When an alternating current is passed through the electromagnetic coil (1), N at each end of the electromagnetic coil (1) synchronizes with the change in the alternating current.
The magnetic poles of pole and south pole alternate.

Therefore, the yoke plate core (4), which is a magnetic material, (
4. The inner peripheral end of the yoke plate core (4) and the yoke plate core (4) are also magnetized in synchronization with changes in the alternating current.
Magnetic poles of different polarity appear alternately on the inner circumferential edge of 4゛). That is, corresponding to the inner circumferential end of the yoke plate core (4) becoming the N pole or the S pole, the inner circumferential end of the yoke plate core (4°) becomes the S pole or the N pole.

Here, if the inner circumferential end of the yoke plate core (4) is magnetized to the S pole during a half wave with alternating current,
The inner peripheral end of the yoke plate core (4') is magnetized to the N pole, and in this case, the S pole at the inner peripheral end of the yoke plate core (4) is magnetized by the first magnet (5). The N pole of the magnet shoe (7C) is an attractive force, and the first magnet (5
) Magnet shoes (7a), (7
It exerts a repulsive interaction with the S pole of b). In addition, the N pole at the inner peripheral end of the yoke plate core (4゛) is connected to the second magnet (5゛).
) The N pole of the magnet shoe (7C) magnetized by the magnet shoe (7C) has a repulsive interaction, and the S pole of the magnet shoes (7a') and (7b') magnetized by the second magnet (5゛) has an attractive interaction. affect As a result, the vibrator (9) receives a leftward force and moves to the left. Next, when the alternating current reaches the next half-wave between the above-mentioned half-waves, the inner peripheral end of the yoke plate core (4) is magnetized to the N pole, and at the same time, the inner peripheral end of the yoke plate core (4°) is magnetized. The end is magnetized to the south pole. In this case, the yoke plate core (4
) and the magnetic pole at the inner peripheral end of the yoke plate core (4),
Magnet shoes (7a), (7d), (7c) and magnet shoes (7a'), (7b'), (7C
') and the oscillator (9) moves to the right due to the completely opposite interaction with the previous half-wave case.

In addition, magnetic shoes (7a), (1b), (
By providing 7C), (7a'), (7b'), and (7c'), the magnitude of the magnetic field lines generated by the first and second magnets (5) and (5゛) at their peripheral edges can be increased. Because the parts are collected, the magnetic poles and magnet shoes (7a), (7b), (7C) and magnet shoes (7a'), (7b) at the inner circumferential ends of the yoke plate core (4) and the yoke plate core (4°) The magnetic force acting between the magnetic poles ') and (7c') becomes extremely strong.

In this way, the vibrator (9) performs reciprocating imaging in the left-right direction in synchronization with the cycle of alternating current, and in conjunction with this, the diaphragm 01) performs left-right imaging. When the vibrator (9) moves to the left, the suction valve Of3 opens while the discharge valve port remains closed, and the fluid sucked into the suction chamber (12a) by the suction port (12b) is transferred to the communication port (12f). The fluid in the working chamber flows through the communication port (12 (1) It is discharged from the discharge port (12e) through the discharge chamber (12b).
The same operation as described above is performed for the configuration on the left side of (°), and in this way, the movable magnet type diaphragm pump shown in FIG. 1 is driven.

The state core (8) of the present invention is used in a movable magnet diaphragm pump having the above-described structure and function, and is characterized in that thin-walled portions are formed at both ends, as described above. It is something.

The state core (8) of the present invention will be explained in detail below.

FIG. 2 is a schematic perspective view of one embodiment of the state core of the present invention, and FIG. 3 is a schematic perspective view of another embodiment of the state core of the present invention.

The one shown in FIG. 2 is a single-layer silicon steel plate with a thickness of about 21 cm, which is formed so that some slits are formed, that is, the cross section is C-shaped.

Moreover, the one shown in FIG. 3 is a 0.3 mm silicon steel plate spirally wound to have a total thickness of about 21 mm.

The device shown in FIG. 2 has the feature that it can prevent the generation of secondary current because the entire structure is an open circuit against the electromotive force generated in the magnetic body in a direction perpendicular to the direction in which the magnetic flux passes. In addition, the structure shown in Figure 3 has a structure in which thin plates are laminated, so it is possible to prevent eddy currents from occurring inside the state core, and the entire structure is an open circuit like the one shown in Figure 2. Therefore, generation of secondary current can also be prevented.

Furthermore, silicon steel sheets with Si added to Fe have the characteristics of low residual magnetization and low hysteresis loss, so energy loss in the magnetic circuit caused by passing alternating current through the electromagnetic coil (1) is reduced. will also become smaller.

For this reason, the energy loss within the state core is reduced and the amount of heat generated is also reduced, and the heat generated by the diaphragm pump itself can also be reduced.

The thickness of the silicon steel plate is not limited to the above value, and is, for example, 0.11Il+ to 1.1Il+. The material may be appropriately selected within the range of Om, and the material is not limited to the silicon steel mentioned above, but any steel with any composition can be used as long as it can reduce residual magnetization.

The shape of the thin wall portion at both end portions of the state core is the shape of the fourth
~ As shown in Fig. 5, the inner diameter may be gradually increased toward the end of the state core, or the state core may be inclined gradually toward the end of the state core.
As shown in the figure, the inner diameter may be gradually increased toward the end of the state core, and the inner thickness may become constant from the middle, or it may be a stepped type as shown in Fig. 6b. As shown in FIG. 6C, it may consist of thin parts at both ends and thick parts at the other ends.

When making a state core having an inclined portion, it may be made by bending a thin plate into a cylindrical shape on which the inclined portion has been formed in advance, or the inclined portion may be processed after forming the thin plate into a cylindrical shape. The thing shown in Fig. 3 is obtained by winding a strip-shaped thin plate in a helical pattern. can also be formed.

Next, the dimensions of the inclined part are shown in Fig. 4 (t
l) is the thickness of the state core, and (tl) is the thickness of the distal end, for example, if the thickness of the state core (tl) is 2.5
In the case of 1, it is preferable that the value (tl) is 1+uell1 degree. Further, the inclination angle (θ) may be selected based on (tl), (tl) and the moving distance of the magnet shoe in the axial direction, but it is about 5 to 30°, with a particularly preferable range of about 10°.

Next, the operation of the state core of the present invention will be explained.

Figures 7-8 show the oscillator (9) and state core (8)
It is a schematic explanatory view showing the right half of the diaphragm 01) and the right diaphragm 01).

As shown in FIG. 7, when the vibrator (9) is in the neutral state of left and right imaging, that is, when the center holding force of the diaphragm 011 is weak, the entrance part of the state core (8) is inclined and the State core (8) and magnet shoe (7a)
), it is possible to create a large gap between (
(3)), attracting magnetic fluxes (A), (B), and (C) are concentrated in the axial direction as axial force (F, ),
Moreover, the force (Fv) that tends to attract the magnet shoe (7a) to the state core (8) can be minimized. When the amplitude of the vibrator (9) advances and reaches the state shown in Figure 8, the diaphragm is stretched and the tensile strength of the rubber is at its maximum, so the force that holds the vibrator (9) in the center is very strong. , the state core (8) and the magnet shoe are quite close inside A), (B),
Even if the adsorption force (Fv) due to (C) becomes strong, the state core (8) and the magnet shoe (7a) do not come into contact with each other. Furthermore, as shown in Fig. 8, even when the vibrator (9) is swung considerably to the left, (A)
, (B), and (C) are large, the resultant force (F,) reliably acts in the axial direction up to the bottom dead center of the vibration, making it possible to demonstrate the performance of the pump at high R. can.

[Effects of the Invention] As explained above, since the state core of the present invention has thin portions formed at both ends thereof, the following effects can be achieved.

■When the vibrator is in the neutral state of left-right vibration and the center holding force of the diaphragm is weak, the gap between the state core and the magnet shoe can be made large, so the adhesion force between them can be minimized, and the diaphragm is biased toward the diaphragm. can be prevented from occurring.

If the adsorption force is kept small when the diaphragm's center holding force is weak, even if the oscillator moves and the state core and magnet shoe get closer to each other and the magnetic attraction becomes strong, the diaphragm will not be stretched at this time. Since the tensile strength of the rubber is at its maximum, the force that holds the vibrator in the center is very strong, and therefore the state core and magnet shoe do not come into contact with each other.

■When the surface of the state core where the magnetic flux enters is inclined, it is possible to obtain a component force in the axial direction during the entire swinging process (from top dead center to bottom dead center), making effective use of magnetic action. It is possible to improve the performance (discharge capacity) of the pump.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a movable magnet diaphragm pump provided with an embodiment of the state core of the present invention, FIG. 2 is a schematic perspective view of an embodiment of the state core of the present invention, and FIG. A schematic perspective view of another embodiment of the state core of the invention, FIG. 4 is an explanatory diagram showing an inclined part of the state core and a magnet shoe, and FIG. 5 is a diagram showing a magnetic shoe having an inclined part corresponding to the inclined part of the state core. FIGS. 6a to 6C are explanatory diagrams of a state core having a thin wall portion with a shape different from that shown in FIG. 4, and FIGS. 7 to 8 are an embodiment of the state core of the present invention FIG. 9 is a cross-sectional view of a conventional movable magnet diaphragm pump, and FIGS. 10 and 11 show the relationship between a state core without a thin wall, a magnet shoe, and a diaphragm. It is an explanatory diagram. (Main symbols in the drawing) (1): Electromagnetic coil (5): First magnet (5°): Second magnet (6): Support shaft (7a), (7b), (7C), (7a' ), (7b'), (7c'): Magnet shoe (8
) Ni state core (9): Vibrator 01), (11°): Diaphragm 8: State core

Claims (1)

[Scope of Claims] 1. An electromagnetic coil and a vibrator inserted into the electromagnetic coil, connected to a diaphragm, and provided with a magnet, the S pole of the electromagnetic coil in the vibrator being attached. and a diaphragm pump that is interposed between the electromagnetic coil and the vibrator of a diaphragm pump in which the polarities of the opposite magnetic poles of the first magnet and the second magnet provided in the portion corresponding to the N pole are the same. A state core for a movable magnet diaphragm pump, characterized in that the state core is a cylindrical state core made of a magnetic material, and both ends thereof are configured to have a larger inner diameter and a thinner wall than other parts. 2. The state core according to claim 1, wherein both ends are provided with sloped parts whose thickness decreases toward the ends. 3. The state core according to claim 1, wherein both ends are provided with stepped portions whose thickness decreases toward the ends.