JPH08135577A - Electromagnetically-driven air pump - Google Patents

Abstract

PURPOSE: To improve drive efficiency and reduce weight and to prevent deterioration of a diaphragm during rest. CONSTITUTION: An electromagnetically-driven air pump comprises a cylindrical magnetic frame 6 around which two exciting coils 7 and 8 are wound so that one pole is formed at two ends and the other pole at a central part; a variation piece 9 wherein a magnetic pole is formed at two ends and a central part is contained in a frame reciprocatively with the flange part 6a of the magnetic frame 6 forming a center; and a pump chamber 1 having a diaphragm 3 connected to one end of the slide piece 9. A magnetic force is exerted on the vibration piece 9 from the two ends of the magnetic frame 6 and the central part thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small electromagnetically driven air pump suitable for sucking gas in an atmosphere.

[0002]

2. Description of the Related Art Since an air pump in which a gas alarm device is incorporated needs to be small, a cylindrical magnetic frame 21 provided with a coil 20 excited by AC power as shown in FIG. The magnetized vibrating piece 22 is provided so as to be able to reciprocate with one half of the vibrating piece 22 protruding from the frame 21, and the diaphragm 24 forming the pump chamber 23 is fixed to one end of the vibrating piece 22 ( Actual public Sho 61
-36788).

With such a structure, the vibrating piece 9 reciprocates around the end 21a of the magnetic frame 21 to deform the diaphragm 24 and expand and contract the pump chamber 1. However, because the vibrating piece 9 projects from the magnetic frame 21, the magnetic pole of the vibrating piece 9 and the magnetic frame 21
Since the distance between the magnetic pole and the magnetic pole is increased, the magnetic resistance is increased, and the efficiency is low. Therefore, the magnetic pole position adjusting piece 25 is provided at one end of the frame 21, and the distance between the magnetic pole of the frame 21 and the magnetic pole of the vibrating piece 22 is increased. Measures to reduce the size are taken.

Therefore, the magnetic resistance of the vibrating element 22 in the vibration direction is unbalanced, and the vibrating element 22 is at rest.
Since the magnetic attraction force pulling toward the magnetic pole position adjusting piece 25 acts on the diaphragm 24, a force in the direction of extending the diaphragm 24 acts on the diaphragm 24, and the diaphragm 24 deteriorates in a short time. In addition, one pole of the magnetic frame 21
Since the vibrating piece 22 is located in the non-magnetic field region, the attraction and repulsion force are small and the efficiency is low, and further, the magnetic adjusting piece 25 for forming the magnetic circuit is required, and the weight is increased. I am also holding.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and its object is to achieve high efficiency, prevent deterioration of the diaphragm, and further reduce the weight. It is to provide a new electromagnetically driven air pump capable of achieving the above.

[0006]

In order to solve such a problem, in the present invention, a plurality of exciting coils are wound so as to form one pole at both ends and the other pole at the center. A cylindrical magnetic frame, a vibrating piece provided on the frame so that the magnetic poles are formed at both ends and a central portion can reciprocate around the other pole, and a diaphragm connected to one end of the vibrating piece. And a pump chamber, and the exciting coil is excited by alternating electric power.

[0007]

Since the vibrating piece is located at the center of the magnetic frame, the magnetic pole position adjusting piece is not required, so that the magnetic attraction force for displacing the vibrating piece in one of the vibrating directions is extremely small even at rest, and the magnetic frame Since the vibrating piece receives the attraction force and the repulsive force at the same time by the same pole formed at both ends and the other pole formed at the central portion thereof, the pump operates with high efficiency.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the illustrated embodiments. FIG. 1 shows an embodiment of the present invention, in which reference numeral 1 is a pump chamber, which is a cup-shaped container 2 formed of a material having a high rigidity, for example, a polymer material or the like.
The opening is closed by a diaphragm 3 formed of an elastic material such as rubber, and a suction port 4 and a discharge port 5 are formed on the bottom surface of the container 2.

A tubular magnetic frame 6 is made of a magnetically permeable material such as soft iron, and divides the region into a central portion in the axial direction. Therefore, the flange portion 6 also made of a magnetically permeable material.
a is formed and is fixed to the pump chamber 1 via the base portion 6b.

Reference numerals 7 and 8 denote exciting coils wound around respective regions divided by the flange portion 6a, so that the exciting directions thereof are opposite to each other, that is, both ends of the magnetic frame 6 have the same pole. In addition, a plurality of flange portions 6a are provided so as to serve as the other pole. Such setting of the exciting direction can be realized by selecting the winding direction of the exciting coil or the direction of the exciting current.

Reference numeral 9 is a resonator element made of a magnetized material such as ferrite. When the exciting coils 7 and 8 are in a non-excited state, an arm 10 is interposed so that the central portion 9a faces the flange portion 6a. Is fixed to the center of the diaphragm 3, and its length is set so that its end portion is located inside the end surfaces 6c and 6d of the winding frame 6.

Reference numeral 12 in the drawing denotes a plate member which opens the valve as shown by a dotted line in the drawing to form a valve for ensuring suction and discharge operations, and 13 denotes an air vent.

Next, the operation of the apparatus thus configured will be described with reference to FIG. In the stationary state, the magnetic resistance of the magnetic frame 6 is symmetrical with the flange portion 6a as a line of symmetry, and the adjusting piece of the magnetic body which is conventionally required is not necessary. Therefore, the vibrating piece 9 is biased to one side. The position at the time of assembling is maintained. As a result, even if the resting state continues for a long time, the diaphragm 3 is not affected by the force that deforms it, and the deterioration of the diaphragm can be prevented.

On the other hand, when alternating current power is supplied to the exciting coils 7 and 8, one end of the exciting coil 7 becomes an S pole and the other end of the frame part becomes the magnetic frame 6 as shown in FIG. The 6a side is an N pole, the other exciting coil 8 is an outside (the left side in the drawing) is an S pole, and the frame portion 6a side is an N pole to generate a magnetic field.

As a result, the diaphragm piece of the vibrating piece 9 is attracted to the S pole of the end portion 6c of the magnetic frame 6 and simultaneously pushed by the N pole of the flange portion 6a side, and the outer side of the vibrating piece 9 has the flange portion 6a. Attracted to the N pole of the excitation coil 8 at the same time
It is repulsed by the S pole outside and moves in the direction of arrow A in the figure. Therefore, the diaphragm 3 is pressed toward the pump chamber 1 and compresses the pump chamber 1. As a result, the gas in the pump chamber 1 is compressed and pressure-fed from the discharge port 5.

In this way, when the vibrating piece 9 reaches the dead center on the pump chamber side, the directions of the currents to the exciting coils 7 and 8 are switched, and as shown in FIG.
Is the N pole on the diaphragm 3 side, the S pole on the flange 6a side, and the N pole on the outside of the exciting coil 8, and the flange 6a
The side becomes the S pole.

As a result, the vibrating bar 9 repels the diaphragm 3 side to the N pole of the exciting coil 7 on the diaphragm 3 side and is simultaneously attracted to the S pole of the flange 6a side, and the outside of the vibrating bar 9 is the exciting coil 8. Is attracted to the N pole outside, and at the same time repulsed by the S pole on the flange portion side 6a to move in the direction of arrow B in the figure. Therefore, the diaphragm 3 is pulled toward the magnetic frame 6 side, expands the pump chamber 1, and causes the suction port 4 to move.
The gas is sucked into the pump chamber 1.

When the vibrating piece 9 reaches the other dead point in this way (FIG. 2C), the exciting directions of the exciting coils 7 and 8 are switched. As a result, the vibrating piece 9 receives the magnetic force similar to that in FIG. 2A from the magnetic frame 6 and moves again in the direction indicated by the arrow A in the figure. Hereinafter, each time the vibrating piece 9 reaches the dead center, the exciting directions of the exciting coils 7 and 8 are switched, whereby the processes of FIG. 2B and FIG. The vibrating reed 9 reciprocates in the axial direction, and the pump chamber 1 is contracted and expanded to perform the pump action.

FIG. 4 shows the relationship between the flow rate (curve A in the figure) and power consumption (reference numeral C in the figure) when the suction load of the pump is changed. Compared with the medium code B) and the power consumption (symbol D in the figure), in the pump of the present invention, the decrease of the flow rate due to the increase of the load amount is small, the power consumption is smaller than that of the conventional one, and the load amount further increases. The degree of increase in power consumption due to the change was smaller than that of the conventional one, and the overall performance was improved by about 1.8 times as compared with the conventional one.

Although the flange 6a is formed at the center of the magnetic frame 6 in the above embodiment, the structure shown in FIG.
As shown in FIG. 3, the region for fixing the magnetic coils 7 and 8 of the magnetic frame 6 is formed into a tubular shape, and the pre-wound excitation coils 7 and 8 are inserted, and then the fixing pieces 13 are attached to the ends. Alternatively, the exciting coils 7 and 8 may be fixed. In addition, the code | symbol 14 in a figure shows a partition plate.

According to this embodiment, since the exciting coil can be attached and detached, not only can the exciting coil be manufactured by a general-purpose coil winding machine, but also the exciting coil can be easily replaced, and the rating change and maintenance can be easily performed. Can be done.

[0022]

As described above, according to the present invention, a cylindrical magnetic frame in which a plurality of exciting coils are wound so as to form one pole at both ends and the other pole at the center, It consists of a vibrating piece having magnetic poles formed at both ends and a central part that is reciprocally movable around the other pole, and a pump chamber equipped with a diaphragm connected to one end of the vibrating piece. Since it was excited by alternating power, the same poles formed at both ends of the magnetic frame,
The other pole formed in the center of the vibrator not only allows the vibrating piece to be driven with high efficiency due to simultaneous attraction and repulsion, but also when the magnetic resistance of the frame in the axial direction is almost symmetrical, it is not driven. Also, the vibrating element is located almost in the center of the frame, and the force for stretching the diaphragm does not act, so it is possible to prevent the deterioration of the diaphragm, and the member that adjusts the magnetic pole position of the magnetic frame is unnecessary and the weight is reduced. Can be planned.

[Brief description of drawings]

FIG. 1 is a sectional view of an apparatus showing an embodiment of the present invention.

FIG. 2A to FIG. 2C are explanatory diagrams showing the operation of the above-mentioned device.

FIG. 3 is a diagram showing flow rate characteristics and power consumption with respect to a load amount of the pump of the present invention and a conventional electromagnetically driven air pump.

FIG. 4 is a sectional view showing another embodiment of the present invention.

FIG. 5 is a sectional view showing an example of a conventional electromagnetically driven air pump.

[Explanation of symbols]

 1 Pump Chamber 3 Diaphragm 4 Suction Port 5 Discharge Port 6 Cylindrical Magnetic Frame 6a Flange 7, 8 Excitation Coil 9 Vibrating Element 10 Arm

Claims (3)

[Claims] 1. A cylindrical magnetic frame around which a plurality of exciting coils are wound so as to form one pole at both ends and the other pole at a central portion, and magnetic poles are formed at both ends so that the central portion is An electromagnetic wave which is composed of a vibrating piece provided on the frame so as to reciprocate around the other pole, and a pump chamber provided with a diaphragm connected to one end of the vibrating piece, wherein the exciting coil is excited by alternating electric power. Driven air pump. 2. The electromagnetic air pump according to claim 1, wherein a flange portion is formed in a central portion of the cylindrical magnetic frame. 3. The electromagnetic air pump according to claim 1, wherein the vibrating piece reciprocates with a dead center near an end of the cylindrical magnetic frame.