JPH09317650A - Electromagnetic pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the attachment of an intake valve by attaching the intake valve by which an intake hole is opened and closed, on a fixing plate through a mounting member by which the fixing plate is attached on a spindle. SOLUTION: In a plate 45, an annular fitting part 45d is formed in the periphery of a shaft penetrating hole 45b, and an intake valve 47 formed of a thin plate consisting of rubber, in which a fitting hole 47a fitted to this fitting part 45d is formed, is attached to this fitting part 45d. This intake valve 47 is so formed that an intake hole 45c is opened and closed. Then, this intake valve 47 is attached to the plate 45, namely, a fixing plate 43, at the same time when tightened in the screw 53 of an oscillator 50 by a nut 49 being a mounting member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic pump, and more particularly to a miniaturized version thereof.

[0002]

2. Description of the Related Art Conventionally, a vibrator having one end attached to a diaphragm is reciprocated or vibrated by a driving means such as an electromagnet, and the vibration of the vibrator causes the diaphragm to be coupled to a support shaft of the vibrator through a fixed plate. An electromagnetic pump that reciprocates or vibrates to suck and discharge a fluid (gas or liquid) is widely known. In addition, this type of electromagnetic pump is provided with a compression chamber having a discharge hole provided with a discharge valve on the other wall with the diaphragm as one side wall, and the suction hole provided with a suction valve is provided in this compression chamber. Is provided. Since there is an advantage that the structure of the intake chamber can be simplified, the intake hole is provided in the fixed plate provided in the diaphragm and to which the spindle of the vibrator is attached, and the intake opening and closing the intake hole. There is a configuration in which the valve is attached to the fixing plate with a fixing screw.

However, although the conventional structure can simplify the structure of the intake chamber by configuring as described above, on the other hand, as shown in FIG. 3, the suction hole 101 provided in the fixed plate 100 and this suction hole are provided. The screw hole (not shown) of the fixing screw 104 for mounting the intake valve that opens and closes the hole 101 needs to be provided so as not to interfere with the mounting portion 103 for mounting the support shaft 102. I won't. Therefore, the fixed plate 100 becomes large, that is, the fixed plate 10
The area occupied on the surface of the diaphragm 110 of 0 is large. When the area of the fixed plate 100 occupying the surface of the diaphragm 110 increases, the desired amplitude cannot be obtained unless the outer diameter of the diaphragm 110 is increased, and the desired suction / discharge performance (hereinafter referred to as pump performance) cannot be obtained. If an attempt is made to prevent the pump performance from deteriorating without increasing the area of the diaphragm 110, that is, in the same area, the fixed plate 100 occupies a large area of the diaphragm 110, so that the bending plate 110 is bent. Since the spring constant is large, the output of the driving means, that is, the electromagnet or the like has to be large. Therefore, the size of the electromagnet is large and the power consumption is large, and the movable area of the diaphragm 110 is small. Therefore, when the diaphragm 110 vibrates, Force clogging stress applied to the bent portion of the outer peripheral portion of the fixing plate 100 is increased, in some cases the diaphragm 110 in the bent portion
The situation occurs that the item is damaged.

[0004]

As described above, in the conventional structure in which the intake hole and the intake valve are provided in the fixed plate provided in the diaphragm, the structure of the intake chamber can be simplified, but the fixed There is a problem that the area occupied by the diaphragm of the plate becomes large and the desired pump performance cannot be obtained unless the outer diameter of the diaphragm is made large.Moreover, if the same pump performance is obtained without increasing the diaphragm area. It is necessary to increase the output of the driving means, and as a result, there is a problem that the driving means becomes large and power consumption increases. Further, since the area of the movable region of the diaphragm is small, the force applied to the bending portion at the boundary of the outer periphery of the fixed plate becomes large when the diaphragm vibrates, and the diaphragm may be damaged at this bending portion in some cases.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, in which a driving means and a vibrating body which vibrates by the driving means and which has a spindle at its end are disposed. A main body housing has a diaphragm attached to a fixed plate having a shaft insertion hole for inserting the support shaft and an intake hole provided with an intake valve as one side wall and an exhaust valve provided with a discharge valve on the other wall. In an electromagnetic pump in which a compression chamber having an outlet is provided, and a diaphragm is vibrated by a vibrator driven by the driving means to suck and discharge fluid, a suction hole provided in the fixed plate is connected to the shaft insertion hole. An electromagnetic pump in which a suction valve that is formed near the outer periphery and that opens and closes the suction hole is attached to a fixed plate via a mounting member that attaches the fixed plate to the support shaft. It is intended.

According to the present invention, the suction hole formed in the fixed plate provided on the diaphragm is formed near the outer periphery of the shaft insertion hole through which the support shaft of the vibrator formed in the fixed plate is inserted, and the suction hole is formed. Since the intake valve that opens and closes the diaphragm is attached to the fixed plate at the same time as the diaphragm is attached by the attachment member that attaches the diaphragm to the support shaft via the fixed plate, the fixing screw for attaching the intake valve is not required and is attached. In addition, since the fixing plate can be downsized, the area occupied by the surface of the diaphragm can be reduced, and the desired pump performance can be obtained without increasing the outer diameter of the diaphragm. It has the effect of being obtained, and without increasing the area of the diaphragm. Since it is possible to obtain the same pump performance, it is not necessary to increase the output of the driving means and the power consumption can be reduced, and since the movable region area of the diaphragm can be increased, the bent portion of the outer periphery of the fixed plate during vibration can be increased. Since the stress applied to the diaphragm can be reduced, the diaphragm can be prevented from being damaged.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described with reference to FIGS.

As shown in FIG. 1, the electromagnetic pump is attached to the main casing 10 which constitutes the main casing 1, and to the left and right of the main casing 10 by attaching means (not shown) such as screws. It is composed of a pair of sub-housings 20 provided with a discharge chamber 21 and a discharge chamber 22 which will be described later, a laminated iron core 30 to which a drive coil 32 disposed in the main housing 10 is attached, a vibrator 50 and the like. There is.

The main casing 10 is provided with a suction port 11 which is opened to the outside to suck a fluid (gas or liquid), and a laminated iron core 30 described later is arranged inside. A chamber 12 is formed, and circular openings 13 are formed on both end sides of the arrangement chamber 12, that is, on both left and right sides in the drawing. An annular fitting groove 13b is formed in the edge portion 13a of the opening 13. A pair of laminated iron cores 30 formed by laminating E-shaped iron cores in a direction orthogonal to the plane of the drawing in the arrangement chamber 12 make their salient poles face each other and separate them by a predetermined distance. The laminated core 30 is attached with a predetermined gap G formed between the winding core 32a and the winding frame 32a.
A drive coil 32 including a coil winding 32b wound around a is attached. Then, the laminated iron core 30
Are attached to the main housing 10 by two attachment screws 33. The drive coil 32 and the laminated iron core 30 constitute a drive means. An AC power supply (not shown) is connected to the coil winding 32b of the drive coil 32 to supply an AC current.

Next, the diaphragm 40 attached to the opening 13 of the main housing 10 and the fixing plate 43 attached to the diaphragm 40 will be described.

The diaphragm 40 is formed of a soft disk-shaped member such as rubber, and has an annular fitting rib 41 that fits in a fitting groove 13b formed in the rim 13a of the opening 13 at the outer peripheral edge. Further, a through hole 42 is formed in the central portion, and an annular fitting rib 42a is formed at the edge of the through hole 42.

Next, the through hole 4 of the diaphragm 40
The fixed plate 43 attached to the 2 is composed of two plates 44 and 45 made of synthetic resin, and one of them, that is, the plate 4 located on the side of the arrangement chamber 12 side.
4 is a fitting groove 44a that fits with the annular fitting rib 42a formed on the edge of the through hole 42 of the diaphragm 40.
Is formed, and a shaft insertion hole 44b is formed in the center thereof. The suction hole 44b is formed in the outer peripheral portion of the shaft insertion hole 44b.
c is formed. An annular fitting rib 45a that fits into the through hole 42 is formed on the other plate 45, and a shaft insertion hole corresponding to the shaft insertion hole 44b formed in the plate 44 is formed in the center portion. 45b is formed, and a suction hole 45c is formed in the outer peripheral portion of the shaft insertion hole 45b corresponding to the suction hole 44c formed in the plate 44.

The plate 45 has the shaft insertion hole 45.
An annular fitting portion 45d is formed on the outer peripheral portion of b, and a suction valve 47 made of a thin plate made of rubber or the like is attached to the fitting portion 45d. The suction hole 47a is fitted into the fitting portion 45d. The suction valve 47 opens and closes the suction hole 45c. The suction valve 47 is attached to the plate 45, that is, the fixed plate 43 at the same time when the suction valve 47 is fastened to the screw 53 of the vibrator 50 described below by a nut 49 as a mounting member described later.

Next, the vibrator 50 disposed between the gaps G formed between the salient poles of the pair of laminated iron cores 30 will be described. As shown in FIG. 2, the vibrator 50 is made of a synthetic resin and has substantially the same structure as a conventional one, and has a rectangular base 51 and a pair of permanent magnets 52 embedded in and attached to the base 51. 52 and screws 53, 5 as a spindle attached to the convex portions 54 provided at both ends of the base 51.
And 3. The end surface of the convex portion 54 serves as a positioning surface for the one plate 44 of the fixed plate 43.

The fixing plate 43 is attached to the diaphragm 40, that is, the through hole 42 as follows. First, the one plate 44 is fitted into the fitting groove 44a of the fitting rib 42a formed at the hole edge of the through hole 42 of the diaphragm 40, and then the fitting rib 45a of the other plate 45 is fitted. Through the through hole 42
The diaphragm 40 is clamped by both plates 44 and 45, and in this state, both plates 44 and 45 are held.
And the diaphragm 40 are adhered or welded to each other.

When the diaphragm 40 having the fixed plate 43 attached thereto is attached to the vibrator 50, one screw 53 of the vibrator 50 is fitted into the shaft insertion holes 44b and 45b of the fixed plate 43 attached to the diaphragm 40. The suction valve 47 by fitting the fitting hole 47a into the fitting portion 45d of the plate 45, and then inserting the fixing washer 48 into the screw 53 to hold the suction valve 47. Replace the nut 49 with the screw 5
3 is screwed onto the diaphragm 40 so that the diaphragm 40
It is attached to one of the screws 53.

Then, with the diaphragm 40 attached to the screw 53 on one side of the vibrator 50 as described above, the screw 53 on the other side of the vibrator 50 is inserted into the opening 13 of the main casing 10, and The fixing plate 43 having the screw 53 on the other side attached to the diaphragm 40 on the other side is attached to the screw 53 on the other side of the oscillator 50 by the nut 49 by the same procedure as in the case of the one side.
Attach to

As described above, the diaphragm 40 is fixed to the screw 53 of the vibrator 50 which is inserted through the shaft insertion holes 44b and 45b of the fixed plate 43, and the nut 49 is fastened.
When it is attached to the
5, that is, it is attached to the fixed plate 43. Therefore, the fixing screw for attaching the suction valve 47 can be eliminated. In addition, the fixed plate 43
The suction holes 44c and 45c formed in the
Since it is formed in the vicinity of the outer circumferences of b and 45b, the shape of the fixed plate 43, that is, the area of the diaphragm 40, that is, the area occupied by the movable area is reduced, that is, when the area of the diaphragm 40 is the same, the movable area Since the movable region area can be increased, the spring constant of the bending diaphragm 40 does not increase, and therefore a predetermined pump performance can be obtained without increasing the output of the electromagnet 30. Is. Further, since the spring constant does not increase, the stress applied to the bent portion of the outer peripheral portion of the fixed plate 43 does not increase, and damage to the bent portion can be prevented.

After the diaphragm 40 and the suction valve 47 are attached to the screws 53 on both ends of the vibrator 50 via the fixing plates 43, the fitting ribs 41 formed on the outer peripheral portion of the diaphragm 40 are attached to the main casing 10. Edge 1 of opening 13
The diaphragm 40 is fitted into the fitting groove 13b formed in 3a, then the outer peripheral portion of the diaphragm 40 is attached to the opening 13, and the diaphragm 40 is held by the flange portion of the sub-casing 20, which will be described in detail below. 10 is attached to the opening 13.

When the diaphragm 40 is attached to the opening 13 of the main casing 10, the vibrator 50 has a pair of permanent magnets 52 and 5 attached to a base 51 thereof.
2 is positioned in a gap G formed between the salient poles of the pair of laminated iron cores 30. As described above, the vibrator 50 has the gap G formed between the salient poles of the pair of laminated iron cores 30.
When an alternating current is supplied to the coil winding 32b of the drive coil 32 from an alternating current power source in a state of being positioned inside,
An alternating magnetic field is generated by the coil winding 32b, and the alternating magnetic field acts on the permanent magnet 52 of the vibrator to vibrate the vibrator 50 in the left-right direction in the drawing, and the vibrator 5
The vibration of 0 causes the diaphragm 40 to reciprocate in the left-right direction in FIG.

Next, the sub-casing 20 is attached so as to close both ends of the main casing 10, that is, the opening 13.
Will be described. As shown in FIG. 1, the sub-housing 20 has a bottomed cylinder having an opening 24 at one end and a bottom wall 25 at the other end and surrounded by an outer peripheral wall 26 integrally formed with the bottom wall 25. And a flange portion 24a for attaching to the rim portion 13a of the opening 13 of the main housing 10 is formed at the opening edge of the opening 24, and the flange portion 24a is attached to the main housing by a mounting screw (not shown). Rim 13 of body 10
The sub-casing 20 is attached to the main casing 10
It is attached to. Then, the sub-housing 20 is provided with the diaphragm 40, and the opening 13 of the main housing 10 is formed.
In the state where the diaphragm 4 is closed and attached, the diaphragm 4 to which the fixing plate for closing the opening 24 is attached
0, by the outer peripheral wall 26 and the bottom wall 25, the compression chamber 21
Is formed. The bottom wall 25 constitutes the other wall of the compression chamber 21, and a discharge chamber 22 is formed which is partitioned by the bottom wall 25 and has a discharge port 22 a adjacent to the compression chamber 21. The compression chamber 21 and the compression chamber 21 communicate with each other through a discharge hole 27 formed in the bottom wall 25,
Further, the discharge hole 27 is provided with a discharge valve 28 for opening and closing the discharge hole 27.

Next, the operation of the electromagnetic pump constructed as described above will be described with reference to FIG. The compression chamber 2
1 and the discharge chamber 22 and the like have the same configuration and operation on the left and right, only the left side compression chamber 21 and the discharge chamber 22 and the like, which are one of them, will be described here, and the description on the right side will be omitted.

First, when an AC power source (not shown) is connected to the winding coil 32b of the driving means to supply electric power, an alternating magnetic field is generated, and this alternating magnetic field is generated by the oscillator 50 through the salient poles of the laminated iron core 30. By acting on the permanent magnet 52, the vibrator 50 vibrates in the left-right direction in the drawing. If the oscillator 50 moves to the right side in the figure due to the alternating magnetic field, the diaphragm 40 also moves to the right side in the figure, and as a result, the volume of the compression chamber 21 increases and the pressure in the compression chamber 21 increases. As a result, the intake valve 47
Opens the suction hole 45c, and the discharge valve 28
The fluid in the chamber 12 communicating with the suction port 11 flows into the compression chamber 21 through the suction holes 45c and 44c.

Next, the polarity of the alternating magnetic field changes and the oscillator 5
If 0 moves to the left in the figure, the diaphragm 40 moves to the left in the figure, and as a result, the compression chamber 2
The volume of 1 is reduced, and at the same time, the suction valve 47 has a suction hole 45c.
And the discharge valve 28 operates to open the discharge hole 27, and the fluid in the compression chamber 21 is discharged from the discharge hole 22a through the discharge hole 27 and the discharge chamber 22.

As described above, the above operation is repeated by the movement of the vibrator 50 vibrating in the left-right direction by the alternating magnetic field generated according to the AC power supplied to the coil winding 32b, and the fluid is the main casing 10. From the suction port 11 opened to the outside of the main body casing 10 to the discharge port 22a opened to the outside of the main casing 10 through the arrangement chamber 12, the suction holes 44c and 45c, the compression chamber 21, the discharge chamber 22, and the discharge port 22a. Is ejected. By repeating this operation, the fluid is sucked from the suction port 11 and discharged from the discharge port 22a.

Then, as described above, the diaphragm 4
Since the suction holes 44c and 45c are formed in the fixed plate 43 of No. 0, the structure of the compression chamber 21 can be simplified.

In the above embodiment, the mounting member for mounting the diaphragm 40, that is, the fixed plate 43 to the screw 53 of the vibrator 50 is the nut 49. However, the mounting member is not limited to the nut, and may be, for example, a vibration. Child 5
In place of the screw 53 as the support shaft of 0, the support shaft is composed of a shaft having an annular groove formed on the outer periphery, and a C ring is fitted into this annular groove as a mounting member to fix the diaphragm 40 via the washer 48. You may choose to do this. In addition,
In this case as well, the suction valve 47 is fitted to the plate 45, that is, the fitting portion 45d of the fixed plate 43, and is attached to the fixed plate 43 by being held by the washer 48. In this case also, the diaphragm 40 to the support shaft is attached. It can be installed at the same time as the installation of.

Further, in the above embodiment, the diaphragm 40 and the fixed plate 43 constituting the diaphragm member are provided on both sides of the vibrator 50, but this may be provided only on one side.

Further, the electromagnetic pump may suck and discharge liquid, and in this case, the laminated iron core 30 and the drive coil 32 may be covered with a waterproof film.

[0030]

According to the present invention, the suction hole formed in the fixed plate provided on the diaphragm is formed in the vicinity of the outer periphery of the shaft insertion hole for inserting the support shaft of the vibrator formed in the fixed plate. Since the suction valve that opens and closes the suction hole is attached to the fixed plate at the same time as the diaphragm is attached by the attachment member that attaches the diaphragm to the support shaft via the fixed plate, the fixing screw for attaching the suction valve is unnecessary. In addition, it has the effect of facilitating mounting, and since the fixing plate can be downsized, the area occupied by the surface of the diaphragm can be reduced, and the desired pump can be obtained without increasing the outer diameter of the diaphragm. It has the effect of obtaining good performance and does not increase the area of the diaphragm. Since the same pump performance can be obtained, it is not necessary to increase the output of the drive means and the power consumption can be reduced. Also, since the movable area of the diaphragm can be increased, the bent portion of the outer periphery of the fixed plate during vibration can be increased. Since the force applied to the diaphragm can be reduced, it is possible to prevent the diaphragm from being damaged.

[Brief description of drawings]

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

FIG. 2 is a vibrator according to the above embodiment.

FIG. 3 is a perspective view of a diaphragm of a conventional electromagnetic pump.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body case 10 Main case (part of main body case) 12 Arrangement chamber 20 Sub-case (part of main body case) 21 Compression chamber 22 Discharge chamber 22a Discharge port 27 Discharge port 28 Discharge valve 30 Laminated iron core (Part of drive means) 32 Drive coil (part of drive means) 40 Diaphragm 43 Fixed plates 44c, 45c Suction port 47 Suction valve 49 Nut (mounting member) 50 Transducer 53 Transducer screw (spindle)

Claims (1)

[Claims] 1. A shaft insertion hole for inserting the support shaft and an intake valve in a main body housing in which a drive means and a vibrating body which has a support shaft at an end and which vibrates by the drive means are arranged. A vibration chamber driven by the driving means, the compression chamber having a discharge port provided with a discharge valve on one side and a diaphragm attached with a fixed plate on which a suction hole is provided In an electromagnetic pump that swings a diaphragm to cause a fluid to be sucked in and discharged, a suction valve that forms a suction hole provided in the fixed plate near the outer periphery of the shaft insertion hole and opens and closes the suction hole is provided. An electromagnetic pump characterized in that the fixing plate is attached to the fixing plate via an attachment member for attaching the fixing plate to the support shaft.