JPH07310669A - Electromagnetic type air pump - Google Patents

Abstract

PURPOSE:To reduce the size of a product and to reduce a product cost by a method wherein the outside of a coil containing part for an electromagnetic coil to reciprocatively drive a pair of diaphragms is covered with a band formed approximately in a U-shape and a temperature-sensitive element connected in series to a coil is disposed on the outer surface of a coil. CONSTITUTION:Annular plate-form plate cores 14 and 15 are arranged between the bobbins 10 and 11 of an electromagnetic coil 2 to reciprocatively drive a pair of the diaphragms 4 and 5 of an electromagnetic air pump 1. Further, plate cores 16 and 17 are arranged on the outer end faces of the bobbins 10 and 11. The cores 16 and 17 are formed in such a manner that an iron sheet is molded approximately in a U-shape through plates 20 and 21 arranged on the outer surfaces of the cores. Fastening and fixing are effected by means of a band 22 with which the upper surface and the two sides of a coil containing part 8 are covered. A temperature fuse 54 being a temperature-sensitive element is arranged at a connection corner part between the end part of a band 22 and a bottom plate 23 by utilizing the space of one corner part in the air pump 1 and fixed to the outer surface of the coil 13 by means of an adhesive.

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 through the electromagnetic coil 103, a pair of diaphragms 105 and 106 are attached to both ends of the shaft 104, and a permanent magnet 107 and a permanent magnet 107 are provided inside the diaphragms 105 and 106.
108 are fixed respectively.

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 is fixed to the outer surface of the upper portion of the coil 102, and the thermostat 112 is connected to the coil 102 in series.

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] Then, for example, due to an abnormal power supply voltage,
When the electromagnetic coil 103 heats up abnormally, the thermostat 112 senses this and turns off. This allows
The supply of power to the coil 102 is cut off to prevent the air pump 100 from being burned.

[0007]

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, since the permanent magnet moves out of both end surfaces of the bobbin, a moving space is required, and the thermostat 112 is arranged on the outer surface of the upper portion of the coil 102 wound around the cylindrical bobbin 101. Therefore, the coil 1 is equal to the size of the thermostat 112.
02, that is, the outer diameter shape of the bobbin 101 becomes large. For these reasons, the pump 100 itself becomes large in size, and 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 thereof is to provide an electromagnetic air pump in which the air pump can be constructed in a small size and the cost of the product can be reduced. .

[0009]

In order to achieve the above object, an electromagnetic air pump according to a first aspect of the present invention is a bobbin having a coil accommodating portion formed on an outer peripheral portion and an insertion hole formed on an inner peripheral portion. An electromagnetic coil having a coil wound around it, a core arranged on at least both end faces of the bobbin, a permanent magnet arranged at a substantially central position in the insertion hole, and a shaft fixed to the central axis, and a shaft of the permanent magnet. In an electromagnetic air pump including a pair of diaphragms attached to both ends and a pair of pump chambers surrounding the diaphragm, an outer side of the coil housing portion of the electromagnetic coil is formed by a substantially U-shaped band. It is characterized in that a temperature-sensitive element connected in series with the coil is arranged at least at one position on the outer surface of the coil located at the corners and both ends of the band while covering.

Further, in the electromagnetic air pump according to the present invention, a bottom plate provided with a coil outlet is continuously provided at both ends of the band, and the bottom plate is positioned at a corner of the continuously connected portion on the outlet side. The temperature sensitive element is disposed on the outer surface of the coil.

[0011]

According to the electromagnetic air pump of the first aspect, when an alternating current is supplied to the electromagnetic coil, the magnetic poles of the N pole and the S pole alternate at both ends of the coil in synchronization with the frequency. This magnetic pole magnetizes the cores arranged on both end faces of the bobbin. Due to the repulsive force and attractive force between the magnetized magnetic pole and the magnetic pole of the permanent magnet, the permanent magnet reciprocates to vibrate the diaphragm, and air is discharged from the pump chamber. The temperature sensitive element is provided at at least one location on the outer surface of the coil positioned at the corners and both ends of the substantially U-shaped band, and shuts off energization to the coil during abnormal heat generation. Since the permanent magnet used moves inside the bobbin, there is no need to provide a separate moving space, and since the temperature sensitive element is installed at the corner, the space inside the air pump can be used effectively and the air pump is small in size. Can be realized.

According to another aspect of the electromagnetic air pump of the present invention, the bottom plate provided with the coil outlet is connected to both ends of the band, and the corner of the connecting portion on the outlet side is connected. A temperature sensitive element is arranged on the outer surface of the coil. The temperature sensitive element is
It can be connected to the end of the coil at the shortest distance.

[0013]

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 an octagonal shape by cutting the corners at four corners, and the outer peripheral portions of the bobbins 10 and 11 have a U-shaped cross section. 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 below, 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 coil 12 and the left end side of the coil 13, which are adjacent to each other. When a lower half-wave current of the alternating current is supplied, the same S is applied to the right end side of the coil 12 and the left end side of the coil 13.
A pole arises.

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 clamped 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. A bottom plate 23 is continuously provided on the lower surfaces of the band 22, the bobbins 10 and 11, and the plate cores 14 to 17, so that the outer side of the electromagnetic coil 2 is composed of the band 22 and the bottom plate 23. It will be covered in a substantially rectangular shape so as to have corners. 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 diaphragms 4 and 5 have mounting portions 27 and 28 fitted to the shaft 26 at their central portions, and fixing plates 29 and 30 fixed to the mounting seats 27 and 28 by pressure.
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, respectively.

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 parts 41 and 42 and air discharge parts 43 and 44, respectively. 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 by screws, and the check valves 48a and 48b are fixed to the air discharge portions 43 and 44 of the side walls by 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. 6, the thermal fuse 54 as a temperature sensitive element is fixed to the outer surface of the coil 13 with, for example, an adhesive material (not shown). The thermal fuse 54 is located on the corner of the end portion 22 a of the band 22 (see FIG. 3) and the bottom plate 23, and is located on the outer surface of the coil 13, that is, one of the four corners of the air pump 1. The space K is provided at one corner. The temperature fuse 54 is connected in series between the coils 12 and 13 and the AC power supply 60 by connecting the lead wire 54 a to the AC power supply 60 and connecting the lead wire 54 b to the coil 13.
The temperature fuse 54 may be fixed to the outer surface of the coil 13 located at the other three corners of the air pump 1, or may be fixed to the outer surface of the coil 12.

As shown in FIGS. 1 and 3, a rubber bush 56 is attached to the bottom plate 23 at a position below the thermal fuse 54 at a corner portion connected to the end 22a of the band 22. The rubber bush 56 serves as an outlet for the coils 12, 13 to the outside, and the cord 55 connected to the terminals of the coils 12, 13 is inserted therethrough. In addition, the bottom plate 23 is 4
The mounting groove 23a (see FIG. 2) is formed in a corner, and the mounting member 57 is mounted in the mounting groove 23a and fixed to the mounting plate 58, whereby the air pump 1 is mounted on the mounting plate 58.

Next, an example of the operation of the air pump 1 will be described with reference to FIGS. 4 and 5. 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. Due to this force, the permanent magnet 3 moves to the right (the direction of arrow C).

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. As for the diaphragms 4 and 5, the convex portions 4a and 5a at the outer peripheral edge portion are the inner case 34,
Since it is fitted into the recesses 39 and 40 of the mounting plate 35, the mounting seat 2
The outer part of 7, 28 will be deformed by its elasticity. At the time of this deformation, the mounting seats 27 and 28 and the fixing plate 2
Since the outer peripheral edges of 9 and 30 are rounded, the diaphragms 4 and 5 are smoothly deformed along the rounded edges.

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. This force causes the permanent magnet 3 to move to the left (the 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 pressure. Become. When the internal space K1 becomes a positive pressure, the check valve 48a is displaced and the communication hole 46a is opened,
The air in the internal space K1 is discharged to the outside from the discharge port 51 via the air discharge part 43. Further, when the internal space K2 becomes negative pressure, the check valve 47b is displaced and the communication hole 4
5b opens, and the outside air is sucked into the internal space K2 from the suction port 50 through the air suction portion 42. Then, this operation is performed in synchronization with the frequency of the AC power supply 60, and the discharge port 5
Air is alternately and intermittently discharged from the nozzles 1 and 52, and the air pump 1 operates.

If, for example, the power supply voltage supplied from the AC power supply 60 becomes abnormally high or the coils 12, 13 abnormally generate heat due to a rare short circuit of the coils 12, 13, etc., the coils 12, 13 and the plate core 14
~ 17 generates heat. Due to this heat generation, the plate core 1
When the temperature of 7 exceeds a predetermined value, the thermal fuse 54 fixed to the outer surface of the coil 13 senses this and blows. As a result, the supply of power to the coils 12 and 13 is cut off and heat generation is suppressed. Once the temperature fuse 54
When the air pump 1 is activated, the thermal fuse 54 is replaced with a new thermal fuse 54, so that the air pump 1
Will be available again.

As described above, in the above embodiment, since the thermal fuse 54 is fixed to the outer surface of the coil 13 located at the connecting corner between the end 22a of the band 22 and the bottom plate 23, the air pump is used. Space K created in the four corners of 1
One of them can be effectively used, and it is not necessary to make the height of the hobbins 10 and 11 particularly high. Further, the permanent magnet 3 has the insertion hole 9
Since it moves inside, it is not necessary to separately provide a moving space, and since one permanent magnet 3 is arranged at the central position in the insertion holes 9 of the bobbins 10 and 11, the shaft 26 can be shortened. . From these things, the air pump 1 can be downsized, and as a result, the parts such as the shaft 26, the bobbins 10, 11 and the band 22 can be downsized, and the cost of the air pump 1 can be reduced. Can be achieved.

Further, since the thermal fuse 54 is fixed to the outer surface of the coil 13, which is located on the rubber bush 56 side for drawing out the coils 12 and 13 among the four corners,
The wiring distance between the thermal fuse 54 and the coils 12 and 13 can be shortened. As a result, it is possible to prevent an adverse effect due to the routing of the wiring, and it is possible to easily perform the replacement work of the thermal fuse.

In the above embodiment, the bobbin 1
Although one permanent magnet 3 is arranged in the insertion holes 9 of 0 and 11, the present invention is not limited to this. For example, a plurality of permanent magnets may be arranged in series so that different magnetic poles are located on both sides. Is also good. Further, in the above-mentioned embodiment, the temperature fuse is fixed by the adhesive material, but it may be pressed and fixed by, for example, a holding plate, or instead of the temperature fuse, other fuse resistance, temperature sensitive reed switch, thermostat, etc. A temperature sensitive element can also be used.

Further, it is needless to say that the fixing structure of the diaphragm, the number of bobbins, the structure of the plate core and the like in the above embodiment are merely examples and can be variously modified without departing from the gist of the present invention. Also,
The electromagnetic air pump in the above embodiment can be used as a domestic septic tank, an air pump for a fish culture tank, for example, a fish tank for live fish in a restaurant, a bolt fastener, a futon dryer,
It can also be used as an air pump for air beds and balloon inflators.

[0034]

As described in detail above, in the electromagnetic air pump of the present invention, it is not necessary to separately provide a moving space for the permanent magnet, and the space formed in the pump can be effectively used. Yes, you can configure the air pump in a small size,
This has the effect of reducing the cost of the product.

[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 perspective view of the main part.

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

[Explanation of symbols]

 1 ... Electromagnetic air pump 2 ... Electromagnetic coil 3 ... 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 22 ··· Band 22a ··· End 23 ··· Bottom plate 26 ··· Shaft 27, 28 ··· Mounting seat 29 , 30 ... ・ Fixing plates 41, 42 ... Air sucking portions 43, 44 ... Air discharging portions 49, 50 ... Suction ports 51, 52 ... Discharging ports 54 ... ··· Thermal fuse 56 ··· Rubber bush (outlet) 60 ··· AC power supply K ···· Spaces K1, K ... internal space

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location H01H 37/76 7346-5G

Claims (2)

[Claims] 1. An electromagnetic coil in which a coil is wound around a bobbin having a coil housing formed on an outer peripheral portion and an insertion hole formed on an inner peripheral portion, a core disposed on at least both end surfaces of the bobbin, and A permanent magnet having a shaft fixed to a central axis, which is arranged at a substantially central position in the insertion hole, and a pair of diaphragms attached to both ends of the shaft of the permanent magnet,
In an electromagnetic air pump including a pair of pump chambers provided so as to surround the diaphragm, an outer side of a coil housing portion of the electromagnetic coil is covered with a substantially U-shaped band, and a corner portion of the band is formed. An electromagnetic air pump characterized in that a temperature-sensitive element connected in series to the coil is arranged at least at one location on the outer surface of the coil located at both ends. 2. A bottom plate provided with an outlet for the coil is continuously provided at both ends of the band, and the outer surface of the coil is located at a corner of the continuously provided portion on the outlet side. The electromagnetic air pump according to claim 1, further comprising a temperature sensitive element.