JPS6365183A - Moving-magnet type diaphragm pump - Google Patents

Abstract

PURPOSE:To improve the extent of driving efficiency, by equalizing each polarity of magnetic poles at the side where magnets are opposed to each other, being installed in a part corresponding to both S and N poles of a solenoid coil in a vibrator, and installing a state core, consisting of a magnetic substance, interposingly between the solenoid coil and the vibrator. CONSTITUTION:A solenoid coil 1, a bobbin 2 and a yoke core 3 are all connected together by a side plates 5a and 5b. In a part corresponding to each inner circumferential end of yoke plates 4a and 4b of a fulcrum shaft 6, there are provided with magnets 7a and 7b, and each polarity of magnetic poles at the opposed side is set down to sameness. A state core 11, consisting of a magnetic substance, is installed interposingly between the solenoid coil 1 and a vibrator 10. Therefore, a resonance state between an alternating variation in an AC current and a vibration of the vibrator is achievable so that the driving efficiency of a pump is raisable.

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. Furthermore, 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.

[Prior art] Conventionally, this type of diaphragm pump
There is one described in JP-A-84603. An outline of such a diaphragm pump is shown in FIG.

In Figure 3! , 21) is a yoke, the upper and lower halves of which are shown in FIG. ) is an E-shaped axially symmetrical cylindrical shape,
Its central shaft portion is hollow. Also yoke 21) material! -1 is a ferromagnetic material such as Fc. In the right and left halves of the yoke a, respectively, there are cylindrical electromagnetic coils (22a) having a donut-shaped cross section and having the same central axis as the yoke.
, (22b) are provided. and yoke f21
At the center of the yoke (21) is a cylindrical vibrator that is slightly shorter than the yoke (2I) along the longitudinal direction of the yoke (21).
1), and the right and left ends of the vibrator force are formed to extend near the right and left ends of the yoke (21).

The vibrator is equipped with four permanent magnets such as cast magnets, with the N pole at the end and the S pole at the left end, and isotropic magnets on both end faces of the permanent magnet Q. The magnetic pole pieces (27a) and (27b), which are magnetic materials, are fixed. Further, the vibrator is fixed, and diaphragms (2Ba) and (213b) are fixed to both ends of a support shaft δ formed along the central axis of the vibrator.

During the half-wave period of the alternating current flowing through the electromagnetic coils (22a) and (22b), magnetic poles with polarities indicated by N and S in FIG. 3 appear at the inner peripheral end of the yoke t2i), and the next Similarly, between half waves, (N)
, (S) appear.

In a diaphragm pump having such a configuration, by applying alternating current to the electromagnetic coils (22a) and (22b), magnetic poles generated at the inner peripheral end of the yoke and N and S poles generated at both ends of the vibrator are separated. A magnetic interaction occurs between the pole and the magnetic pole, which causes the oscillator to be moved to the right during the previous half-wave and to the left during the next half-wave. In this way, the vibrator 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. And the right side of the diaphragm (28a) and the diaphragm (2θ
b) Applying regular pressure fluctuations to the fluid in the working chamber (not shown) provided on the left side of the diaphragm pump by sucking the fluid into the working chamber or discharging the fluid outside the working chamber. functions as a pump.

[Problems to be solved by the invention] In conventional diaphragm pumps, permanent magnets (24
In order to strengthen the residual magnetization of the yoke, it is necessary to increase the permeance coefficient of the magnet, and therefore permanent magnets with long dimensions are used.Furthermore, the magnetic poles and permanent In order to strengthen the magnetic force acting between the S and N poles of the magnet (241), isotropic magnetic pole pieces (27a) and (27b) are placed on the left and right end faces of the permanent magnet (241). Therefore, the weight of the oscillator becomes very large.Therefore, due to the design conditions of the diaphragm or the weight of the oscillator, !T!kk
It is not possible to match the natural frequency of the vibrator, which is determined by When the diaphragm pump enters a resonance state, the discharge capacity of the diaphragm pump suddenly decreases, which raises the issue of the drive efficiency of the diaphragm pump.

The present invention has been made to solve the above-mentioned problems, and by providing a path for the magnetic flux generated by the electromagnetic coil outside the vibrator, and thereby reducing the weight of the vibrator, alternating changes in alternating current can be avoided. It is an object of the present invention to provide a movable magnet diaphragm pump that achieves a resonance state with the vibration of a vibrator and increases the drive efficiency of the pump.

[Means for Solving the Problems] The movable magnet diaphragm pump of the present invention includes an electromagnetic coil and a vibrator that is inserted into the electromagnetic coil, connected to a diaphragm, and provided with a magnet. A diaphragm pump comprising: a first magnet and a second magnet provided in a portion of the vibrator corresponding to the south pole and north pole of the electromagnetic coil; The magnetic poles on both sides have the same polarity, and a state core made of a magnetic material is interposed between the electromagnetic coil and the vibrator.

[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 rate is several 101 per minute.
1 is a partial cross-sectional view of a movable magnet type diaphragm pump of approximately 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. The outer periphery of the electromagnetic coil (1) is made of a silicon steel plate of 0.3a+m spirally wound to cover the electromagnetic coil (1) and share a central axis with the electromagnetic coil (1). 1 mr
A cylindrical yoke core (3) of s 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 A bobbin (2) made of 86 nylon is provided which has a uniform thickness of 2 to 3 mm and has a U-shaped upper and lower half in its longitudinal section. Then, on both the left and right end surfaces of the bobbin (2), there are donut plate-like thicknesses of 0.5 in contact with these.
A right-hand yoke plate core (4a) and a left-hand yoke plate core (4b), which are made by laminating several M11 silicon steel plates, are fixedly installed. The yoke plate cores (4a) and (4b) protrude slightly from the inner peripheral surface of the bobbin (2) in the direction of the central axis. and yoke plate core (
On the right end surface of 4a) and the left end surface of the yoke plate core (4b), a right side plate (5a) and a left side plate (5b) made of polycarbonate and having substantially the same shape as donut plates are in contact with these, respectively. It is provided.

On the right side of the side plate (5a) and the left side of the size 1 plate (5b), the inner diameter is the yoke plate core (4
A recess slightly smaller than the outer diameter of a) and (4b) is formed. .

Then, the electromagnetic coil (1), bobbin (2), and yoke core (
3) and the yoke plate cores (4a), (4b) are sandwiched by being connected by appropriate means by the two side plates (5a), (5b). A support shaft (6) of a vibrator (described later) is provided at the center axis of the electromagnetic coil (1), and the support shaft (6) of the vibrator (described later) is formed to extend in the direction of the center axis. 4a), (
4b), a short cylindrical ferrite magnet (7a) which is a first magnet on the right side and a flight magnet (7b) which is a second magnet on the left side are fixed by appropriate means. It is provided. The central axes of the ferrite magnets (7a) and (7b) coincide with the central axis of the support shaft (6).
The polarities of the opposing magnetic poles in b) are both S-poles, and therefore the polarities of these opposite magnetic poles are N-poles. And ferrite magnets (7a), (7b)
On both the left and right end faces of each, in contact with this,
Magnet shoes (8a), (8b), (8C), and (8d), which are disk-shaped and made by laminating several silicon steel plates that are isotropic magnetic materials with a thickness of 0.5 mm, are suitable means. It is fixedly installed.

And the magnetic shoe (8
The left end surface of a) is braked by an appropriate means so that it can move within a range of approximately 10 mm to the left of the left end surface of the yoke plate core (4b), and the magnet shoe (8d) located at the rightmost end is also braked by appropriate means. The right end face is the yoke plate core (
It is possible to move to the right within a range of about 10 m+s from the right end surface of 4a).

At the same time, the right end surface of the magnet shoe (8b) can be moved to the right within a range of approximately 14 degrees from the left end surface of the yoke plate core (4b), and the left end surface of the magnet shoe (8c) is movable to the right from the left end surface of the yoke plate core (4b). It can move within a range of approximately 14 mm to the left from the right end surface of the core (4a).

And the magnet shoe (8b) and the magnet shoe (
8C), the central axis of which coincides with the central axis of the support shaft (6), and a cylinder made of a silicon steel plate with a thickness of 0.3aIIs wound in a spiral shape and having a total thickness of about IIIffi. A pole core (9) shaped like the pole core (9) is provided.
) are attached to the left and right end faces of the magnetic shoe (8
b) and the left end surface of the magnet 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 distance pλ of approximately 1 mm is formed between these outer peripheral surfaces and the inner peripheral surfaces of the yoke plate cores (4a) and (4b). The support shaft (6), the ferrite magnets (7a), (7b), the magnet shoes (8a), (8b), (8C), (8d), and the pole core (9) constitute the gravitational element 00). There is. And between the pole core (9) and the bobbin (2), approximately in the center of the bobbin (2), there is a silicon plate with a thickness of 0.3 m+s that is aligned with the central axis or the central axis of the support shaft (6). A cylindrical state core 01) having a total thickness of about 2 m+s is provided by spirally winding m plates. Here, the value of the sum of the cross-sectional area of the state core (Ill) and the cross-sectional area of the pole core (9) almost matches the value of the area of the inner peripheral end surface of the yoke plate core (4a) or the yoke plate core (4b). The state core (li) 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 (01) is fixed to the inner circumferential surface of the bobbin (2). ) and (4b) are substantially flush with the inner peripheral end surfaces. Further, the length of state core 01) is slightly shorter than the length of pole core (9).

The inner peripheral end surfaces of the side plates (5a) and (5b) are the inner peripheral end surfaces of the yoke plate cores (4a) and (4b). It is formed to protrude slightly inward from the d end face, and this protruding part or side plate (5a) is formed with a stopper (
5c), and the side plate (5b) is a stopper (5d).

Here, the size of the gap between the inner circumferential surfaces of the stoppers (5C) and (5d) and the outer circumferential surfaces of the ferrite magnets (7a) and (7b) is about 0.5 m+*.

The four parts of the side plates (5a) and (5b) each include a right diaphragm stand (12a) and a left diaphragm stand (12b) made of approximately donut-shaped PBT.
Both ends of the support shaft (6) pass through the center of the diaphragm stands (12a) and (12b) and protrude outward. As shown on the right side of Fig. 1, the right end surface of the diaphragm stand (12a) has a suction chamber (13a), a discharge chamber (13b), and a recess (13c).
Casing member 03) made of PBT in which
is fixed, and between the diaphragm stand (12a) and the casing member n, there is a diaphragm 04) made of approximately disk-shaped EPDM whose peripheral end is connected to the diaphragm stand (12a).
) and the casing member 0a. In addition, the support shaft (6) is located at the center of the diaphragm 04).
), and center plates a and re are provided on both sides of the diaphragm (141) to push and pull the diaphragm (14) to displace it left and right.And these diaphragms 04) and the center The plate ra and the ring are interposed between the seat O and the nut 07), and are fixed on the right end of the support shaft (6) by being attached with the force of the nut a.

A working chamber is formed by the diaphragm 04) and the recess (13c) of the casing member C3.

The casing member (2) is also provided with a suction port (13d) that communicates with the suction chamber (13a) and a discharge port (13e) that communicates with the discharge chamber (131).
A suction valve 081 is provided in the communication hole (13r) provided in the partition between the working chamber and the discharge chamber (13b), and a communication hole (13g) provided in the partition between the working chamber and the discharge chamber (13b) is provided with a suction valve 081. is equipped with a discharge valve.

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). It becomes.

In addition, the above-mentioned yoke core (3) and yoke plate core (4)
a), (4b), state core (II), pole core (
9) and magnet shoes (8a), (8b), (8c
) and (8d) are laminated silicon steel plates with a thickness of 0.3 to 0.5+u+, and are open in terms of electrical circuit so that they do not form internally continuous loops. It is in a state.

Here, the state core 01) has a structure in which the thin plate is spirally wound as shown in Figure 2, and the end (31) of this thin plate is coated with an insulating adhesive or the like on the side wall of the thin plate. It is converted into yen by appropriate means.

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 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 (4a), which is a magnetic material,
(4b) 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, the inner circumferential end of the yoke plate core (4b) becomes the S pole or the N pole corresponding to the inner circumferential end of the yoke plate core (4a) becoming the north pole or the south 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 yoke plate core (4a)
The S pole at the inner peripheral end of the magnetic shoe (8c) is attracted to the N pole of the magnet shoe (8d) magnetized by the ferrite magnet (7a).
) exerts a repulsive interaction with the south pole of In addition, the N pole at the inner peripheral end of the yoke plate core (4b) is a ferrite magnet (7b).
) exerts a repulsive interaction with the N pole of the magnet shoe (8a) magnetized by the ferrite magnet (7b), and an attractive interaction with the S pole of the magnet shoe (8b) magnetized by the ferrite magnet (7b). As a result, the vibrator 001 receives a leftward force and moves to the left within the above-mentioned movement range. 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 (4a) is magnetized to the N pole, and at the same time, the inner peripheral end of the yoke plate core (4b) is magnetized. is magnetized to the south pole. In this case, the magnetic poles at the inner peripheral ends of the yoke plate core (4a) and the yoke plate core (4b) are completely opposite to the magnetic poles of the magnet shoes (8c) and (8b) from the previous half-wave case. As a result of this interaction, the vibrator 00) moves to the right within the above-mentioned movement range.

In addition, magnet shoes (8a) and (8b) made of isotropic magnetic material
), (8C), and (8d), most of the magnetic lines of force generated by the ferrite magnets (7b) and (7a) are collected at the peripheral edges of these magnets. The magnetic force acting between the magnetic pole at the inner circumferential end of 4b) and the magnetic poles of the magnet shoes (8C), (8d) and the magnet shoes (8a), (8b) becomes very strong.

In this way, the vibrator (to) performs reciprocating vibration in the left-right direction in synchronization with the cycle of the alternating current, and in conjunction with this, the diaphragm (14) vibrates in the left-right direction. When the vibrator M moves to the left, the discharge valve OC4 remains closed and the suction valve OF3
opens and the fluid sucked into the suction chamber (13a) by the suction port (13b) flows into the working chamber through the communication port (13r), and then when the oscillator ['lO] moves to the right. When the suction valve Oa closes, the discharge valve 09 opens and the fluid in the working chamber passes through the communication port (13g) to the discharge chamber (13b).
The liquid is then 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 example, ferrite magnets (7a), (7b
) has anisotropy, so it becomes a strong magnet even if it is thin, and the magnetic poles at the inner peripheral ends of the yoke plate cores (4a) and (4b) are the S of the magnet shoes (8C) and (8b).
Since it interacts strongly with the poles, the force that causes the vibrator O○) to vibrate is also strong.

In addition, by making the vibrator hollow to reduce its weight, the natural frequency of the vibrator η is made to match the frequency of the alternating current supplied to the electromagnetic coil (1) (in this example, the frequency is set to 57 II z in consideration of the alternating current frequency used in the Kansai region and the Kansai region), the alternating change in the alternating current and the vibration of the perturber 00 come together to drive the pump.

Note that the magnetic flux generated by the electromagnetic coil (1) is the oscillator CO
), rather than concentrating it in the pole core (9) of the electromagnetic coil (1), by providing the state core 01), the magnetic flux is dispersed there as well, and furthermore, the state core (old) serves as the main path for the magnetic flux passing between the two poles of the electromagnetic coil (1). By making it so that the thickness of the pole core (9) can be made thinner, the Lr! of the vibrator C○) can be made thinner. Q can be further reduced.

Due to the strong vibrating force as shown in 2 and the light weight of the vibrator Cl0), the vibrator 00) takes pictures almost in synchronization with changes in the alternating current.

Also, yoke core (3), yoke plate core (4a),
(4b), state core (5a), (5b), pole core (9) and magnet system, S < 8a), (8b
), (8C), and (8d) are made of laminated thin silicon steel plates with a thickness of 0.3 to 0.5 mm, so it is possible to prevent eddy currents from occurring inside them, and they themselves are individually Since the open circuit is made by laminating steel plates or spirally wound, it is also possible to prevent the generation of secondary current along the closed circuit when a normal continuous closed circuit is used.

Also, yoke core (3), yoke plate core (4a),
(4b), state core (tl), magnet shoe
(8a), (8b), (8c), (8d), and the pole core (9) are made of silicon steel plates with Sl added to Pe, and these steel plates have the characteristics of low residual magnetization and low hysteresis loss. Therefore, the loss of energy within the magnetic circuit caused by passing an alternating current through the electromagnetic coil (1) is also reduced.

For this reason, yoke core (3), yoke plate core (4a), (4b), state core 01), magnet shoe (8a), (8b), (8c), (8d),
Loss of energy within the pole core (9) is reduced, and heat generation is also reduced, so that the heat generation of the diaphragm pump itself can be reduced.

Furthermore, if the diaphragm (14) is damaged due to deterioration of its material over time, the vibrator 00) will move beyond the suitable movement range of the vibrator CO), The right side of the magnetic shoe (8d) or the left side of the magnetic shoe (8a) is the stopper (5c).
) or to the right of the stopper (5d). At the same time, the magnetic force between the magnet shoe (8d) or magnet shoe (8a) and the yoke plate core (4a) or yoke plate core (4b) causes the magnet shoe (8d) or magnet shoe (
8a) is attracted to the inner circumferential end surface of the yoke plate core (4a) or yoke plate core (4b), and is attracted to the right side surface of the magnetic shoe <8d) or the magnetic shoe (8d).
the left side of a) or the stopper (5c) or the stopper (
5d), the vibration of the vibrator (g) is damped.

As a result, fluctuations in the discharge amount of the diaphragm pump occur, and an abnormality in the pump drive is detected, and the electromagnetic coil (1
), the pump can be stopped driving and damage to the vibrator (goods) etc. 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 to these, and other magnets such as rare earth magnets with strong magnetic force may also be used. can.

Also, bobbin (2), side plates (5a), (5b)
, the diaphragm stand (+2a), (12b), the casing part 43), and the diaphragm 04) are not limited to those of the above embodiments, but any heat resistant material can be used, such as ABS and PET. etc. can also be used.

Further, in the above embodiment, the stoppers (5c) and (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). Furthermore, the material of the stopper <5cL (5d) is not limited to the same material as the side plates (5a) and (5b) in the above embodiment, but may be made of PET, ABS, etc. as long as it is a non-magnetic material with heat resistance. can also be used.

Furthermore, yoke core (3), yoke plate core (4)
The materials of a), (4b), state core 01), magnet sea L (8a), (8b), (8C), (8d), and pole core (9) are also limited to the silicon steel of the above embodiment. Instead, state steel can be used as long as it can reduce residual magnetization and hysteresis loss.

Furthermore, the yoke core (3
), the values of the thickness of the yoke plate cores (4a), (4b), etc., and the value of the movement range of the vibrator C○), etc. are not limited to the values of the above embodiments, and are not limited to the values of the pump capacity a and other values. Of course, it can change depending on the conditions.

[Effects of the Invention] As described above, according to the movable magnet diaphragm pump according to the present invention, the axial length of the vibrator is short and the magnetic force is applied to the portions of the vibrator corresponding to the S and N poles of the electromagnetic coil. A strong first magnet and a second magnet are provided, and the magnetic poles of these magnets on opposite sides have the same polarity, and a state that is a magnetic material is provided between the electromagnetic coil and the vibrator. Since the core is interposed, the magnetic circuit of the magnetic flux generated by the electromagnetic coil (1) includes the yoke plate (4a), the yoke core (3), and the yoke plate (
4b) and the pole core (9) and state core old) forming a parallel circuit, and the magnetic flux path is provided not only to the pole core (9) of the moving part but also to the state core (II) of the fixed part. It turns out. Therefore, in this case, the cross-sectional area of the magnetic circuit made of magnetic material can be increased, and the magnetic resistance of the magnetic circuit can be reduced. As a result, the magnetomotive force of the electromagnetic coil (1) is reduced, the current value passed through the electromagnetic coil (11) is also reduced, and the thickness of the pole core in the vibrator can be reduced, which has the effect of reducing the weight of the vibrator. There is. This eliminates the need to use a long magnet for the vibrator as in the past, and in addition to making the vibrator hollow and lightening it, the weight of the vibrator can be further reduced, allowing the electromagnetic coil to be energized. It is possible to achieve a resonance state between the alternating alternating current and the vibration of the vibrator, which has the effect of increasing the driving efficiency of the diaphragm pump. This has the effect of changing the vibration period of the vibrator to be approximately synchronized with the period of the alternating current flowing through the electromagnetic coil, and reducing the power consumption of the diaphragm pump.

Table 1 shows the relationship between the weight of the vibrator and the air discharge amount for the diaphragm pump of the present invention. As is clear from Table 1, the amount of air discharged increases as the thickness of the pole core is reduced to reduce the weight of the vibrator and the natural frequency of the vibrator (G) is tuned to the power frequency.

Chapter 1 Table

[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 a state core in the embodiment, and FIG. 3 is a diagram of a conventional movable magnet diaphragm pump. It is a partially sectional view. (Main symbols in the drawing) (1): Electromagnetic coil (7a): First magnet (7b): Second magnet C○), vibrator al), state core 21 Figure 11; State core 23 figure

Claims (1)

[Claims] 1. A diaphragm pump equipped with an electromagnetic coil and a vibrator inserted into the electromagnetic coil, connected to a diaphragm, and provided with a magnet, wherein the S pole and the S pole of the electromagnetic coil in the vibrator A first magnet and a second magnet are provided in a portion corresponding to the N pole, and the polarities of the magnetic poles on opposing sides of both magnets are the same, and the electromagnetic coil and the vibrator A movable magnet type diaphragm pump with a state core made of magnetic material interposed between.