JP2565626Y2 - Diaphragm air pump - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diaphragm type air pump for supplying compressed air by vibrating a diaphragm, and is particularly suitable when at least two pump sections are provided to obtain a high pressure. The present invention relates to a diaphragm type air pump that can be employed.

[0002]

2. Description of the Related Art As shown in FIG. 6, a diaphragm type air pump having two stages of pump units is an electromagnetic type driving device.
At 0A and 100B, diaphragms 101A and 10
By vibrating the first diaphragm chamber 1B,
02A is introduced into the second diaphragm chamber 102B to further compress the compressed air, and the compressed air discharged from the diaphragm chamber 102B is discharged to the discharge port 1A.
Discharge from 01b.

As shown in FIG. 6, a conventional general diaphragm-type air pump in which a pump section including a diaphragm chamber is provided in two stages to obtain a high pressure has only one diaphragm 101A and 101B in each stage. And the respective diaphragms 101A, 101
B is caused to vibrate by the individual driving devices 100A and 100B.

[0004]

However, if there is only one diaphragm 101A, 101B in each stage as in the conventional diaphragm type air pump shown in FIG. 6, the inner and outer diaphragms are particularly required like the diaphragm 101B in the latter stage. When the pressure difference is large, the diaphragm 101B expands due to the pressure difference. Therefore, there is a problem that the amplitude of the diaphragm 101B is reduced, and the life of the diaphragm 101B is shortened by the reaction force due to the vibration. As a method for solving such a problem, it is conceivable to increase the rigidity of the diaphragm. However, when the rigidity of the diaphragm is increased, the force required to deform the diaphragm itself is increased, and accordingly, it becomes difficult to compress the air, and the efficiency of the pump is reduced.

[0005] This invention has been made in view of the above circumstances, and without reducing the efficiency of the pump.
It is an object of the present invention to provide a diaphragm-type air pump including at least a two-stage pump unit, which can suppress a reduction in the life of the diaphragm due to vibration.

[0006]

According to a first aspect of the present invention, there is provided a diaphragm type air pump comprising: a pair of diaphragms which are disposed opposite to each other in an airtight chamber and have fixed rotating shafts which are parallel to each other; A drive source that vibrates so that the opposing parts move toward or away from each other at the same time about the respective rotation axes, and are fixed to the first predetermined opposing parts of the pair of diaphragms, respectively, and A pair of first diaphragms forming a partitioned first diaphragm chamber, and a second diaphragm chamber fixed respectively to a second predetermined opposing portion of the pair of diaphragms and each partitioned from the air-tight chamber. And a pair of second diaphragms, and a suction port of each of the first diaphragm chambers having a suction valve communicates with an air introduction portion, and a discharge port of each of the first diaphragm chambers having a discharge valve. Mouth and communicates with the suction port of the second diaphragm chamber the air seal chamber with a suction valve, discharge port of the second diaphragm chamber provided with a discharge valve is communicated with the air outlet.

[0007]

In the diaphragm type air pump according to the first aspect of the present invention, the pair of diaphragms are rotated by operating the drive source such that the opposing portions approach or separate at the same time about the respective rotating shafts. Therefore, the pair of first diaphragms perform pumping at the same timing, and the pair of second diaphragms also perform pumping at the same timing.
Since the pressure difference between the inside and outside of the pair of first diaphragms is equal,
The amplitudes of the pair of first diaphragms due to the vibration are also substantially equal. Since the pressure difference between the inside and outside of the pair of second diaphragms is equal, the amplitudes of the pair of second diaphragms are also equal. For this reason, the vibrations of the pair of first diaphragms provided in the facing portion cancel each other, and the vibrations of the pair of second diaphragms provided in the facing portion also cancel each other.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A diaphragm type air pump according to the invention shown in FIG. 1 includes a casing 1, a pair of first stage pump units 2, a pair of second stage pump units 3, and a driving unit 4.

The casing 1 is formed in a tubular shape with both ends closed. The casing 1 has a pair of an air inlet 1A, an air outlet 1B, and an air-tight chamber 1C formed therein.

The air inlet 1A is provided with the casing 1
Is opened at one end face 1a of the first side. This air inlet 1A
Are connected to a suction port 24b of the first-stage pump section 2 described later inside the casing 1.

The air discharge portion 1B is open at the other end surface 1b of the casing 1. Each of the air discharge portions 1B is connected to a discharge port 34b of a second-stage pump portion 3 described later inside the casing 1.

The air-tight chamber 1C is provided with the casing 1
Inside, the space for disposing the air introduction part 1A, the air discharge part 1B, the pair of first-stage pump parts 2 and the pair of second
It occupies a portion excluding a space where the stage pump section 3 is provided.
This air-tight chamber 1C is connected to the discharge port 24b of the first-stage pump 2.
In addition, portions other than the communication portion with the suction port 34a of the second stage pump 3 are formed airtight.

Each of the pair of first-stage pump sections 2 includes a first diaphragm 21, a first suction valve 22, and a first discharge valve 23, and is connected to the air introduction section 1A in the casing 1. I have.

The first diaphragm 21 is formed in a cylindrical shape whose one end is closed, and its peripheral edge is fixed to a mounting piece 1c integrally formed with the casing 1. Also, the first
A mounting portion 21 a protruding outside the first diaphragm 21 is integrally formed on the closed end face of the diaphragm 21. The inside of the first diaphragm 21 constitutes a first diaphragm chamber 24. This first diaphragm chamber 24
Communicates with the air introduction section 1A through a suction port 24a, and communicates with the air-tight chamber 1C through a discharge port 24b.
Is in communication with

The first suction valve 22 is a check valve provided at the first suction port 24a, and allows only the suction of air from the air inlet 1A into the first diaphragm chamber 24, and prevents the reverse flow. I do.

The first discharge valve 23 is a check valve provided in the first discharge port 24b, and allows only discharge of air from the first diaphragm chamber 24 to the air-tight chamber 1C, and prevents the reverse flow. I do.

Each of the pair of second-stage pump sections 3 includes a second diaphragm 31, a second suction valve 32, and a second discharge valve 33, and is connected to the air discharge section 1B in the casing 1. I have.

The second diaphragm 31 is exactly the same as the first diaphragm 21. That is, the second diaphragm 31 is formed in a cylindrical shape whose one end is closed, and its peripheral edge portion is formed integrally with the casing 1.
c. In addition, a mounting portion 31 a protruding outside the second diaphragm 31 is integrally formed on the closed end face of the second diaphragm 31. The inside of the second diaphragm 31 constitutes a second diaphragm chamber 34. The second diaphragm chamber 34 communicates with the air-tight chamber 1C via a suction port 34a and a discharge port 3
It communicates with the air discharge part 1B via the air outlet 4b.

The second suction valve 32 is a check valve provided at the suction port 34a, and allows only suction of air from the air-tight chamber 1C to the second diaphragm chamber 34 and prevents the reverse flow.

The second discharge valve 33 is a check valve provided at the discharge port 34b, and allows only the discharge of air from the second diaphragm chamber 34 to the air discharge portion 1B, and prevents the reverse flow.

The driving section 4 is provided in the air-tight chamber 1C. The drive unit 4 includes a pair of diaphragms 41, a pair of permanent magnets 42, and an electromagnet 43.

The pair of diaphragms 41 have the same shape.
In the airtight chamber 1C, they are arranged symmetrically with respect to the central axis C0 so as to face each other. Rotation shafts 41a parallel to each other are fixed to the diaphragms 41 at intermediate positions of the diaphragms 41 facing each other. These rotating shafts 41
a is rotatably attached to the casing 1. Further, a mounting portion 21a of the first diaphragm 21 is fixed to each of the vibration plates 41 at a first predetermined facing position on the distal end side with respect to the rotation shaft 41a, and a base end side with respect to the rotation shaft 41a. The mounting portions 31a of the second diaphragm 31 are fixed to the second predetermined facing positions. In a state where the first diaphragm 21 and the second diaphragm 31 are not vibrated, each of the diaphragms 41 is kept horizontal.

The pair of permanent magnets 42 are fixed to respective base ends of the pair of diaphragms 41, respectively. These permanent magnets 42 are fixed such that the same polarity portions face electromagnets 43 described later.

The electromagnet 43 is fixed at a position facing the pair of permanent magnets 42 at a predetermined interval in the airtight chamber 1C. When an AC voltage is applied to the electromagnet 43, the polarity of a portion of the electromagnet 43 facing the intermediate portion of the pair of permanent magnets 42 is continuously switched. That is, by applying an AC voltage to the electromagnet 43, the pair of permanent magnets 42 vibrate by continuously repeating a cycle of moving simultaneously in a direction approaching each other and then simultaneously moving in a direction away from each other. Further, when the pair of permanent magnets 42 vibrate in this manner, the pair of diaphragms 41 vibrate around the respective rotation shafts 41a. At this time, the respective vibration plates 41 vibrate at timings when the opposing portions approach and simultaneously separate from each other.

The diaphragm-type air pump configured as described above performs pumping as the pair of diaphragms 41 vibrate by operating the electromagnet 43.

First, when the pair of permanent magnets 42 move in the direction away from each other as shown by the arrow X in FIG. 2, each diaphragm 41 rotates in the direction of the arrow X about the rotation shaft 41a. . When the respective diaphragms 41 rotate in the direction of the arrow X in this manner, in the first stage pump 2, the first diaphragms 21 fixed to the respective diaphragms 41 are pulled in directions approaching each other. The volume of the chamber 24 increases. Therefore, as shown in FIG.
Is opened, and air is sucked into the first diaphragm chamber 24 via the air inlet 1A and the suction port 24a.

On the other hand, when each diaphragm 41 rotates in the direction of the arrow X, the second diaphragm 31 moves in the direction away from each other in the second stage pump section 3, so that the volume of the second diaphragm chamber 34 decreases. , The second discharge valve 3 as shown in FIG.
3 is open.

Next, as shown by the arrow Y in FIG. 3, when the pair of permanent magnets 42 move in a direction approaching each other, each diaphragm 41 rotates in the direction of the arrow Y about the rotation shaft 41a. . As a result, the first stage pump unit 2
The diaphragm 21 is pushed in a direction away from each other, and the first
The volume of the diaphragm chamber 24 returns to the original volume. Accordingly, the first suction valve 22 is closed, and the first diaphragm chamber 2 is closed.
4 is compressed in the first diaphragm chamber 24. Then, when the first diaphragm 21 is further pushed in a direction in which the pair of permanent magnets 42 rotates in the arrow Y direction, the volume of the first diaphragm chamber 24 decreases, and as shown in FIG. The discharge valve 23 opens. As a result, the air compressed in the first diaphragm chamber 24 is discharged to the air-tight chamber 1C via the discharge port 24b.

On the other hand, when each diaphragm 41 rotates in the arrow Y direction, in the second stage pump section 3, the second diaphragms 31 move in a direction approaching each other, and accordingly, the second suction valve 32 opens. . Therefore, through the suction port 34a, the second
The compressed air in the air-tight chamber 1C is sucked into the diaphragm chamber 34.

Next, when each diaphragm 41 rotates in the arrow X direction again, the first stage pump unit 2 performs the first rotation in the same manner as in the case where the respective diaphragm 41 previously rotated in the arrow X direction. Air is sucked into the diaphragm chamber 24. On the other hand, in the second-stage pump 3, the pair of second diaphragms 31 move in the direction away from each other, so that the air further compressed after being sucked from the air-tight chamber 1C in the second diaphragm chamber 34,
The air is discharged from the second diaphragm chamber 34 to the air discharge section 1B via the discharge port 34a.

Hereinafter, the pair of vibrating plates 41 vibrate as the pair of permanent magnets 42 continuously repeat the movement of the arrows YX, and accordingly, the pair of vibrating plates 41 are introduced into the casing 1 from the air introducing portion 1A. After the air is compressed in two stages by the first-stage pump unit 2 and the second-stage pump 3, the air is sent out of the casing 1 via the air discharge unit 1B.

In the above-described diaphragm type air pump, compressed air is discharged from the first diaphragm chamber 24 of the first stage pump 2 to the air-tight chamber 1C.
There is almost no pressure difference between the inside and outside of the first diaphragm 21, and the pressure difference between inside and outside of the second diaphragm 31 is also small.
It is smaller than the case where the outside of 1 is the atmospheric pressure.

Further, according to the above diaphragm type air pump, the second diaphragm 31 of the pair of second stage pumps 3 is used.
Although a pressure difference occurs between the inside and outside, the pressure difference between the inside and outside of the second diaphragm 31 of each second stage pump 3 is equal, and the vibration directions of the pair of second diaphragms 31 during pumping are always in opposite directions. The reaction force due to the vibration of the second stage pump 3 is canceled. Of course, similarly, the reaction force due to the vibration of the pair of first-stage pumps 2 is also canceled.

In the above embodiment, the pair of diaphragms 41
Although the drive source for vibrating is composed of a combination of an electromagnet and a permanent magnet, it may be replaced with another known drive source. In short, the drive source for driving the pair of diaphragms 41 only needs to vibrate these diaphragms 41 so that the opposing portions approach and separate at the same time.

The diaphragm type air pump according to the invention is
The structure A shown in FIG. 1 may be one unit, and a plurality of the structures A may be connected in series as shown in FIG.

[0036]

According to the first aspect of the present invention, the pressure difference between the inside and outside of the first diaphragm is almost eliminated, and the pressure difference between inside and outside of the second diaphragm is made smaller than before.
In addition, the life of the second diaphragm can be extended.
Further, the reaction force due to the vibration of the first diaphragm and the reaction force due to the vibration of the second diaphragm are offset between the pair of first diaphragms and between the pair of second diaphragms. Life reduction can also be suppressed.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a diaphragm type air pump according to the invention.

FIG. 2 is a diagram illustrating the operation of the diaphragm air pump of FIG.

FIG. 3 is a diagram illustrating the operation of the diaphragm air pump in FIG. 1;

FIG. 4 is a diagram illustrating a modified example of the diaphragm type air pump according to the invention.

FIG. 5 is a schematic configuration diagram of a conventional diaphragm air pump.

[Explanation of symbols]

 1C Air-sealed chamber 21 First diaphragm 22 First suction valve 23 First discharge valve 24 First diaphragm chamber 24a Suction port 24b Discharge port 31 Second diaphragm 32 Second suction valve 33 Second discharge valve 34 Second diaphragm chamber 34a Suction Port 34b Discharge port 41 Vibration plate 42 Permanent magnet 43 Electromagnet

Claims (1)

(57) [Scope of request for utility model registration] 1. A pair of diaphragms, which are opposed to each other in an air-sealed chamber and have fixed rotation axes that are parallel to each other; A drive source that vibrates so as to be separated from each other, and a pair of first diaphragms that are fixed to first predetermined facing portions of the pair of diaphragms, respectively, and form a first diaphragm chamber that is partitioned from the air-tight chamber. A diaphragm, and a pair of second diaphragms respectively fixed to a second predetermined facing portion of the pair of diaphragms, and each forming a second diaphragm chamber partitioned from the air-tight chamber. A suction port of each first diaphragm chamber provided with a suction valve communicates with an air introduction portion, and a discharge port of each first diaphragm chamber provided with a discharge valve and a suction port of each second diaphragm chamber provided with a suction valve; Is connected to the air-tight chamber, and a discharge port of each of the second diaphragm chambers provided with a discharge valve is connected to an air discharge portion.