JPH07310668A - Electromagnetic type air pump - Google Patents

Abstract

PURPOSE:To reduce the size of a product and to reduce cost by a method where in a permanent magnet is arranged in the insertion hole of an electromagnetic coil in the outer peripheral part of which a coil containing part is formed and a pair of pump chambers are arranged in such a manner to surround a pair of diaphragms attached to the two end parts of the shaft of he permanent magnet. CONSTITUTION:When a half-wave current is fed from an AC source 60 to the coils 12 and 13 of an electromagnetic coil 2, plate cores 14 and 15 are magnetized into an S-pole and plate cores 16 and 17 magnetized into an N-pole. A permanent magnet 3 is moved rightward and the central parts of diaphragms 4 and 5 are moved rightward through a shaft 26. As a result, an internal space K2 in a right pump chamber 7 is compressed and air is delivered through a delivery port 52 by means of an air delivery part 44. Meanwhile, an internal space K1 of a left pump chamber 6 is expanded and outside air is sucked through an air suction part 41 by means of a suction port 49. By feeding a half-wave current, the diaphragms 4 and 5 moved leftward and in following, similar operation is repeated to continuously deliver air.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic air pump having a diaphragm.

[0002]

2. Description of the Related Art Conventionally, electromagnetic air pumps used for domestic septic tanks, fish tanks, etc. are, for example, Japanese Patent Publication No. 4-210.
No. 75 publication. As shown in FIG. 7, this electromagnetic air pump has an electromagnetic coil 103 in which a coil 102 is wound around a cylindrical bobbin 101.
A shaft 104 is inserted into the electromagnetic coil 103, a pair of diaphragms 105 and 106 are attached to both ends of the shaft 104, and a pair of permanent magnets 10 are provided inside the diaphragms 105 and 106.
7, 108 are fixed.

A cylindrical state core 109 made of a magnetic material is provided in the electromagnetic coil 103, and plate cores 11 are provided on both end surfaces of the bobbin 101.
0 and 111 are arranged. A thermostat 112 connected in series to the coil 102 is fixed to the outer surface of the coil 102.

In the electromagnetic air pump 100, when an alternating current is supplied to the electromagnetic coil 103, N and S magnetic poles are alternately generated at both ends of the coil 102 in synchronization with the change of the alternating current. . Thereby, the plate core 11
Nos. 0 and 111 are also magnetized in synchronism, and magnetic poles of S pole and N pole appear alternately at the inner peripheral edge thereof. Then, by the repulsive force and attractive force by this magnetic pole and the magnetic poles of the permanent magnets 107, 108, that is, the shaft 10
4 reciprocates in the axial direction, and the diaphragms 105, 106
Vibrates.

When the diaphragms 105 and 106 move to the right (arrow A direction), for example, the left pump chamber 11
Outside air is sucked into the chamber 3 through the suction port 115, and the air in the right pump chamber 114 is discharged from the discharge port 118 to the outside. When the diaphragms 105 and 106 move to the left (the direction of arrow B), the outside air is sucked into the pump chamber 114 through the suction port 116 and the pump chamber 113.
The air inside is discharged from the discharge port 117 to the outside. This operation is performed in synchronization with the frequency of the alternating current, and the air is discharged from the outlet 1.
Discharge from 17 and 118 alternately and intermittently.

[0006]

However, in this electromagnetic air pump, the size of the pump itself becomes large,
There is a problem that the product cost is likely to increase. That is, the plate cores 110 and 111 are connected to the bobbin 101.
Are arranged on both end faces of the plate cores 110, 111.
Since the permanent magnets 107 and 108 are arranged in the holes provided at the center of the
At the time of movement, it moves out of the plate cores 110 and 111. Therefore, a space for this movement is required, and the pump 100 itself becomes large. As a result, the size of the component becomes large and the cost of the component increases, so that the cost of the product increases.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electromagnetic air pump in which the size of the air pump can be reduced and the cost of the product can be reduced. .

[0008]

In order to achieve the above object, an electromagnetic air pump according to a first aspect of the present invention has a cylindrical shape in which a coil accommodating portion is formed on an outer peripheral portion and an insertion hole is formed on an inner peripheral portion. In this case, a plurality of bobbins are connected in series, and the coils are wound around the coil housing so that the same magnetic poles are generated at both ends adjacent to each other, and at least the cores arranged on both end faces of the bobbin are inserted into the insertion holes. A permanent magnet whose shaft is fixed to its central axis, and a pair of diaphragms attached to both ends of the shaft of the permanent magnet,
And a pair of pump chambers provided so as to surround the diaphragm.

An electromagnetic air pump according to a second aspect of the present invention is characterized in that a plurality of permanent magnets are connected in series, and different magnetic poles are located at both ends of the magnets connected in series. The air pump is characterized in that the core is provided so as to extend into the insertion hole of the bobbin.

[0010]

According to the electromagnetic air pump of the first aspect, when an alternating current is supplied to a plurality of coils of the electromagnetic coil, the N pole and the S pole are provided at both ends of the coil in synchronization with the frequency. The magnetic poles of the poles are alternately generated, and the magnetic poles magnetize the cores arranged on both end faces of the bobbin. The repulsive force and attractive force between the magnetized magnetic pole and the magnetic poles at both ends of the permanent magnet arranged in the insertion hole of the bobbin cause the permanent magnet to reciprocate together with the shaft. As a result, the diaphragm vibrates and air is discharged from the pump chamber in synchronization with the frequency of the alternating current. The permanent magnet moves in the bobbin,
Since it does not protrude outside the bobbin, the air pump can be made smaller.

In the electromagnetic air pump according to the second aspect of the present invention, a plurality of permanent magnets are connected in series so that different magnetic poles are located at both ends, and a permanent magnet is used between the magnetized core and the magnetized core. A repulsive force and an attractive force having characteristics depending on the number can be generated. Further, in the electromagnetic air pump according to the third aspect, the width of the permanent magnet can be reduced by providing the plate cores at both ends of the bobbin so as to extend into the insertion holes.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. 1 to 3 show an electromagnetic air pump according to the present invention, FIG. 1 is a sectional view thereof, FIG. 2 is a plane sectional view of FIG. 1, and FIG. 3 is a sectional view taken along line AA of FIG. is there. In the figure, an electromagnetic air pump 1 (hereinafter, simply referred to as an air pump 1) includes an electromagnetic coil 2, a permanent magnet 3 arranged in the electromagnetic coil 2, and a pair of diaphragms 4, 5.
And the pump chambers 6, 7 and the like.

The electromagnetic coil 2 has, for example, a pair of bobbins 10 and 11 formed in octagonal shapes by cutting the four corners, and the bobbins 10 and 11 have a U-shaped cross section on their outer peripheral portions. A coil housing portion 8 is formed, and an insertion hole 9 is formed in the inner peripheral portion. The coil housing 8 has coils 12, 13
Are each wound. These coils 12 and 13 are
As described later, when the upper half-wave current of the alternating current is supplied, the same N pole is generated on the right end side of the adjacent coil 12 and the left end side of the coil 13, and the AC When the lower half current of the current is supplied, the same south pole is generated on the right end side of the coil 12 and the left end side of the coil 13.

Between the bobbins 10 and 11 of the electromagnetic coil 2,
Donut plate-shaped plate cores 14 and 15 are arranged, and plate cores 16 and 17 having shaft insertion holes 18 and 19 in the center are arranged on the left end surface of the bobbin 10 and the right end surface of the bobbin 11, respectively. The plate cores 14 to 17 are formed, for example, by stacking a plurality of plate-shaped iron cores, and like the bobbins 10 and 11,
The four corners are cut to form an octagonal shape.

The plate cores 16 and 17 are fastened and fixed by a band 22 via plates 20 and 21 arranged on the outer side surfaces thereof. The band 22 is formed into a substantially U-shape by bending an iron plate and covers the upper surface and both side surfaces of the coil housing portion 8 of the bobbins 10 and 11. The bobbins 10 and 11 and the plate core 14 to
A bottom plate 23 is continuously provided on the lower surfaces of 17 and the band 22,
As a result, the outer side of the electromagnetic coil 2 is covered with the band 22 and the bottom plate 23 in a substantially rectangular shape. Further, the plates 20 and 21 are also provided with holes through which a shaft 26 described later is inserted.

The permanent magnet 3 arranged in the insertion holes 9 of the two bobbins 10 and 11 is made of, for example, a ferrite magnet in a cylindrical shape, and magnetized in advance so that the left end side becomes the N pole and the right end side becomes the S pole. Has been done. A shaft 26 is fixed to the central axis of the permanent magnet 3, and substantially disk-shaped diaphragms 4 and 5 made of PBT or EPDM are attached to both ends of the shaft 26.

The central portions of the diaphragms 4, 5 are mounting seats 27, 28 fitted to the shaft 26, and fixing plates 29, 30 fixed by pressure to the mounting seats 27, 28.
It is attached by being sandwiched between and. In addition, screw portions 26a and 26b are formed at both ends of the shaft 26, and a nut 32 is screwed into the screw portions 26a and 26b via a washer 31 to fix the fixing plate 2
9 and 30 are pressed against the mounting seats 27 and 28.

The pump chambers 6 and 7 have inner cases 34 and 35 and outer cases 36 and 37 which are arranged so as to surround the diaphragms 4 and 5. Four case fixing portions 34a, 35a and 36a, 37a (36a is not shown) are formed on the outer peripheral portions of the inner cases 34, 35 and the outer cases 36, 37, respectively. Then, by fixing the case fixing portions 34a and 36a and the case fixing portions 35a and 37a to the band 22 and the plates 20 and 21 with screws 38, the inner case 34 and the outer case 36, and the inner case 35 and the outer case are fixed. 37 are integrally attached. On the outer periphery of the inner cases 34, 35,
The annular recesses 39, 40 (see FIG. 1) are formed, and the annular projections 4a, 5a formed on the outer peripheral edge portions of the diaphragms 4, 5 are fitted into the recesses 39, 40.

As shown in FIG. 2, the outer cases 36 and 37 are provided with air suction portions 41 and 42 and air discharge portions 43 and 44. Then, the internal spaces K1 and K2 of the outer cases 36 and 37, the air suction portions 41 and 42, and the air discharge portion 4
Communication holes 45a and 45b and communication holes 46a and 46b are formed on the side walls of the connection holes 3 and 44. This communication hole 45
Check valves 47a and 47b are fixed to the portions a and 45b, and check valves 48a and 48b are fixed to the communication holes 46a and 46b.

The check valves 47a and 47b are fixed to the inner spaces K1 and K2 of the side walls with screws, and the check valves 48a and 48b are fixed to the air discharge portions 43 and 44 of the side walls with screws. ing. Air suction section 41, 42
Suction ports 49, 50 are provided in the air discharge units 43, 4
4, discharge ports 51 and 52 are provided. The structure of the pump chambers 6 and 7 is an example, and other appropriate structures can be adopted, and the check valves 47a, 47b, 48a and 48 can be used.
The structure for attaching b to the side wall may also adopt the conventional structure shown in FIG. 7, for example.

As shown in FIG. 3, a thermal fuse 54 is provided on the outer surface of the coil 13 at the position where the end portion 22a of the band 22 and the bottom plate 23 are arranged in series. The temperature fuse 54 is connected in series to the coil 13, and the temperature fuse 54 shuts off the power supply to the coils 12 and 13 when the coils 12 and 13 and the like generate abnormal heat. In addition, as shown in FIG. 1 and FIG.
A rubber bush 56 for guiding the cord 55 connected to the ends of the coils 12 and 13 to the outside is attached. The bottom plate 23 has mounting grooves 23a at four corners (see FIG. 2).
The air pump 1 is attached to the attachment plate 58 by attaching the attachment member 57 to the attachment groove 23 a and fixing it to the attachment plate 58.

Next, an example of the operation of the air pump 1 will be described with reference to FIGS. First, as shown in FIG. 4, when an upper half-wave current having a sinusoidal waveform is supplied to the coils 12 and 13 of the electromagnetic coil 2 from the AC power supply 60, the coils 12 and 13 are moved to the right end side and the left end side of the coil 12, respectively. An N-pole magnetic pole is generated, and an S-pole magnetic pole is generated on the left end side of the coil 12 and the right end side of the coil 13, whereby the plate core 1
4 and 15 are magnetized to the S pole, and the plate cores 16 and 17 are magnetized to the N pole. By magnetizing the plate cores 16 and 17 to the N pole, a repulsive force acts on the left end side (N pole) and an attractive force acts on the right end side (S pole) of the permanent magnet 3. As a result, the permanent magnet 3 moves in the right direction (arrow C direction).

The movement of the permanent magnet 3 causes the shaft 26 to move integrally therewith. Due to the movement of the shaft 26, the central portions of the diaphragms 4 and 5, that is, the mounting seats 27 and 28 are moved to the right. Diaphragm 4,
5, the protrusions 4a and 5a on the outer peripheral edge are the inner cases 34 and 35.
Since it is fitted in the recesses 39, 40 of the mounting seat 27,
The outer part of 28 will be deformed by its elasticity. During this deformation, the mounting seats 27, 28 and the fixing plates 29, 3
Since the outer peripheral edge of 0 is rounded, the diaphragms 4 and 5 are smoothly deformed along the rounded edge.

By this deformation, the internal space K2 of the right pump chamber 7 is compressed to a positive pressure, and the internal space K1 of the left pump chamber 6 is expanded to a negative pressure. When the internal space K2 has a positive pressure, the check valve 48b is displaced to open the communication hole 46b, and the air in the internal space K2 is discharged from the air discharge portion 44.
Is discharged to the outside through the discharge port 52. Further, when the internal space K1 becomes negative pressure, the check valve 47a is displaced and the communication hole 45a is opened, and the suction port 4 is inserted into the internal space K1.
The outside air is sucked from 9 through the air suction portion 41.

On the other hand, as shown in FIG.
When the lower half-wave current of the alternating current is supplied to 3, an S pole is generated on the right end side of the coil 12 and the left end side of the coil 13, and an N pole is generated on the left end side of the coil 12 and the right end side of the coil 13. .
As a result, the plate cores 16 and 17 are magnetized to the S pole, and the magnetic poles of the magnetized plate cores 16 and 17 exert a repulsive force on the right end side (S pole) of the permanent magnet 3 to the left end side (N pole). An attractive force acts on. As a result, the permanent magnet 3
Moves to the left (direction of arrow D).

When the permanent magnet 3 moves to the left, the diaphragms 4, 5 are deformed via the shaft 26, the internal space K1 of the pump chamber 6 becomes positive pressure, and the internal space K2 of the pump chamber 7 becomes negative. It becomes pressure. When the internal space K1 becomes positive pressure, the check valve 48a is displaced and the communication hole 46 is moved.
a opens, and the air in the internal space K1 is discharged from the discharge port 51 to the outside through the air discharge unit 43. Further, when the internal space K2 becomes a negative pressure, the check valve 47b is displaced to open the communication hole 45b, and the suction port 50 is provided in the internal space K2.
The outside air is sucked from the air suction unit 42 through the air suction unit 42. Then, this operation is performed in synchronization with the frequency of the AC power supply 60, and the air is alternately and intermittently discharged from the discharge ports 51 and 52 to operate the air pump 1.

As described above, in the above embodiment, since the permanent magnet 3 is arranged at the center position in the insertion hole 9 of the bobbins 10 and 11, and the permanent magnet 3 moves in the insertion hole 9, the movement space is limited. There is no need to provide it separately and the permanent magnet 3
The length of the shaft 26 can be shortened and the size of the air pump 1 can be reduced. As a result, the parts such as the shaft 26, the bobbins 10, 11 and the band 22 are downsized, the part cost is reduced, and the state core 109 shown in the conventional example is not necessary, so that the number of parts is reduced. The cost of the pump 1 can be reduced.

FIG. 6 shows another embodiment of the electromagnetic air pump according to the present invention. Hereinafter, the same parts as those in the above-described embodiment will be described with the same reference numerals. The feature of the air pump 61 in this embodiment is that three permanent magnets are arranged in a row in the bobbins 10 and 11, and the bobbin 1 is used.
Plate cores 16 and 1 arranged on both end surfaces of 0 and 11
7 is extended to the inside of the insertion hole 9.

That is, the permanent magnet 3a is fixed substantially at the center of the shaft 26, and the permanent magnets 3b and 3c are fixed with a slight gap on both sides of the permanent magnet 3a. Each permanent magnet 3
The magnetic poles a to 3c are magnetized as shown in FIG. 6, for example, and the south pole is located on the left end side of the permanent magnet 3b and the north pole is located on the right end side of the permanent magnet 3c. In addition, cylindrical cores 62 and 63 are connected to the plate cores 16 and 17 so as to be positioned inside the insertion hole 9. The tips of the cores 62 and 63 extend to the positions of the permanent magnets 3b and 3c, and the plate cores 14 and
Spaces K3 and K4 are formed between the space 15 and the space 15.

The air pump 61 includes coils 12, 1
When an alternating current is supplied to 3, the N pole and the S pole are alternately generated on the right end side of the coil 12 and the left end side of the coil 13 (FIG. 6 shows the case where the S pole is generated). As a result, the space K3 side of the core 62 and the space K4 side of the core 63 are alternately magnetized to the S pole and the N pole (FIG. 6 shows the case where they are magnetized to the N pole). A repulsive force and an attractive force act between this magnetic pole and the left end magnetic pole (S pole) of the permanent magnet 3b and the right end magnetic pole (N pole) of the permanent magnet 3c, and this force causes the permanent magnets 3a to 3c to move. The diaphragms 4, 5 vibrate as they reciprocate. In this embodiment, the facing surface side of the permanent magnet may be the same magnetic pole and a plurality of them may be connected in series, or the facing surface side may be a different magnetic pole and a plurality of them may be connected in series.

Even with this structure, the permanent magnets 3a to 3a are
c can be moved in the insertion holes 9 of the bobbins 10 and 11, and the air pump 61 can be constructed in a small size as in the above embodiment, and the cost of the product can be reduced. Further, it is possible to obtain the air pump 61 having the characteristics corresponding to the number of the permanent magnets arranged in series, and it can be used for various purposes.

Further, by providing the cores 62 and 63, the width of the permanent magnets 3a to 3c (h in FIG. 6) can be reduced, and the weight of the permanent magnets 3a to 3c, which is a moving body, is reduced. As compared with the air pump 1 of the above embodiment, the air pump 61 having excellent responsiveness can be obtained. By the way, in this air pump 61, the pressure-air performance curve shows that the pressure is improved about twice as much as the air pump 100 shown in the conventional example, and the magnetic force of the permanent magnets 3a to 3c is not deteriorated. , Confirmed experimentally.

It is needless to say that the diaphragm fixing structure, the number of bobbins, the structure of the plate core and the like in each of the above embodiments are merely examples, and can be variously modified without departing from the scope of the present invention. . Also,
The electromagnetic air pump in each of the above examples can be used as an air pump for household septic tanks and fish tanks, and is also used in, for example, live fish tanks for restaurants, bolt fasteners, futon dryers, air beds, balloon inflators, etc. It can also be used as an air pump.

[0034]

As described above in detail, in the electromagnetic air pump of the present invention, it is not necessary to separately provide a moving space for the permanent magnet, the air pump can be downsized, and the product cost can be reduced. An effect such as being able to be achieved is achieved.

[Brief description of drawings]

FIG. 1 is a sectional view of an electromagnetic air pump according to the present invention.

FIG. 2 is a plan sectional view of FIG.

FIG. 3 is a sectional view taken along the line AA of FIG.

FIG. 4 is an explanatory diagram of the same operation.

FIG. 5 is an explanatory diagram of the same operation.

FIG. 6 is a sectional view showing another embodiment of the electromagnetic air pump according to the present invention.

FIG. 7 is a sectional view showing a conventional electromagnetic air pump.

[Explanation of symbols]

 1, 61 ... Electromagnetic air pump 2 ... Electromagnetic coil 3, 3a to 3c ... Permanent magnet 4, 5 ... Diaphragm 6, 7 ...・ Pump chamber 8 ・ ・ ・ ・ ・ ・ ・ ・ Coil housing 9 ・ ・ ・ ・ ・ ・ Insertion hole 10, 11 ・ ・ ・ ・ Bobbin 12, 13 ・ ・ ・ ・ Coil 16, 17 ・ ・ ・ ・ Plate Core 26 ... Shaft 27, 28 ... Mounting seat 29, 30 ... Fixing plate 41, 42 ... Air suction part 43, 44 ... Air discharge part 49, 50 ... ・ Suction port 51, 52 ・ ・ ・ ・ Discharge port 60 ・ ・ ・ ・ AC power supply 62, 63 ・ ・ ・ ・ Core K1, K2 ・ ・ ・ ・ Internal space

Claims (3)

[Claims] 1. A coil accommodating portion is formed on an outer peripheral portion and a plurality of cylindrical bobbins each having an insertion hole formed on an inner peripheral portion are continuously arranged, and the coil is formed so that the same magnetic pole is generated at both end portions adjacent to each other. Electromagnetic coils wound around the coil housing, at least cores disposed on both end surfaces of the bobbin, permanent magnets disposed in the insertion holes, and having a shaft fixed to the central axis thereof, and the permanent magnets. A pair of diaphragms attached to both ends of the shaft, and a pair of pump chambers provided so as to surround the diaphragm,
An electromagnetic air pump comprising: 2. The electromagnetic air pump according to claim 1, wherein a plurality of said permanent magnets are continuously provided, and different magnetic poles are located at both ends of the continuously provided magnets. 3. The electromagnetic air pump according to claim 1, wherein the core is provided so as to extend into the insertion hole of the bobbin.