JPH11264378A - Electromagnetic pump - Google Patents

Abstract

(57) [Problem] An object of the present invention is to provide an electromagnetic pump in which the operation of a vibrator is improved. SOLUTION: A suction / injection device provided with a diaphragm 40 on one side.
Opposite side walls 2 of the suction / compression chamber 22 of the main body case 10 provided with the compression chamber 22 and the iron core storage chamber 12
5 is provided with a concave empty chamber 60 having an opening on the suction / compression chamber 22 side, and a bearing 70 provided in the opening of the empty chamber 60 for supporting the tip end of the shaft 57 of the vibrator 50 is provided.
An electromagnetic pump in which a reciprocating operation of the vibrator 50 is improved by providing a groove 71 (communication passage) for communicating the empty chamber 60 with the suction / compression chamber 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventionally, a vibrator attached to a shaft of a diaphragm provided at one end on one side of a suction / compression chamber is provided.
The vibrator is reciprocated by a driving means composed of an electromagnet, and the diaphragm is reciprocated to form a fluid (gas / liquid).
Electromagnetic pumps for sucking and discharging gas are widely known.

In order to support or dispose the vibrator in this type of electromagnetic pump, a shaft extending from both ends of a frame constituting the vibrator in a reciprocating direction is fixed via a fixing member. There is a configuration in which a diaphragm provided on one side of the suction / compression chamber is attached and disposed between magnetic poles facing each other.

In this structure, the vibrator shaft is supported on the diaphragm via a fixing member.
Although it has the advantage that its configuration is relatively simple,
Since the diaphragm is formed of a flexible sheet member such as rubber, it is difficult to accurately dispose the vibrator in a narrow gap formed between the magnetic poles facing each other. Also, if the thickness of the sheet member varies, the vibrator is displaced during operation, and if this deviation occurs, the vibrator may come into contact with the magnetic pole during the reciprocating operation of the vibrator. Occurs. In order to avoid this, the gap must be increased, and if the gap is increased, there arises a problem that the pump performance is reduced.

As a method for solving this problem, a bearing is provided on the side wall of the suction / compression chamber, that is, the side wall facing the diaphragm, and the tip of the shaft of the vibrator is supported on the bearing, and the vibrator is connected between the magnetic poles. An arrangement which is arranged with high accuracy in the gap is described in, for example, Japanese Patent Application Laid-Open No. 54-119108. As shown in the detailed description of the specification and in FIG. 1, the diaphragm is sandwiched between both ends of a yoke and a bowl-shaped end plate attached to both ends of the yoke. The end plate is formed outwardly as shown in FIG. 1 and opens the working chamber, that is, the suction / compression chamber, to allow the shaft to move when the shaft reciprocates inside. A bearing is attached to the opening, and both ends of a shaft fixed to both ends of a movable element, that is, a vibrator, are supported by the bearing.

[0006] As a material of the bearing in the above configuration, although not specified in the above-mentioned publication, a material generally called an oil-impregnated metal or the like in which metal is impregnated with oil is used. It is what is being done. On the other hand, the diaphragm is formed of a rubber sheet or the like,
Since some electromagnetic pumps have a case made of synthetic resin, the bearing is impregnated by the vibrator shaft sliding in the shaft hole of the bearing during the reciprocation of the vibrator. There is a problem that the oil is scattered to the outside as the shaft slides and adheres to the diaphragm or the case, and deteriorates the diaphragm or the case in long-term use.

[0007] Further, as in the configuration described in the above publication, the configuration in which the bearing is mounted requires that the suction / compression chamber be airtight with the outside in terms of pump performance. The vacant room whose chamber side is opened also needs to be airtight with the outside. Also,
The inner peripheral wall of the shaft hole of the bearing and the outer peripheral surface of the vibrator shaft are covered with an oil film, but are almost airtight between them.

Therefore, the interior of the vacant space is kept almost in a sealed state. As a result, the tip of the shaft moves at a high speed through the vacant space during the operation of the vibrator. It will move while compressing the air. In other words, during the operation of the vibrator, an extra driving force is required to move the shaft against the air pressure in the chamber, which increases with rapid intrusion of the shaft into the chamber, and the vibration due to the resistance of the air pressure is required. There is a problem that the amount of reciprocating movement of the child, that is, the stroke length is reduced, and the pump performance is reduced.

[0009]

As described above, in the conventional electromagnetic pump in which the vibrator is supported by the diaphragm, the vibrator is disposed in a narrow gap formed between the magnetic poles facing each other. It is difficult to dispose the sheet member with high accuracy, and if the thickness of the sheet member varies, a deviation occurs during the operation of the vibrator, and in some cases, the vibrator contacts the magnetic pole during the reciprocating operation of the vibrator. Invite the situation,
Further, if the gap is increased to avoid this, there is a problem that the pump performance is reduced.

In order to solve this problem, the structure in which the shaft of the vibrator is supported by a bearing is used. When the bearing is made of an oil-impregnated metal, the oil impregnated in the bearing scatters to the outside during the operation of the vibrator. In addition to the problem that the diaphragm or the case adheres to the diaphragm or the case and deteriorates the diaphragm or the case, the structure for mounting the bearing must be an air chamber opened to the suction / compression chamber and be airtight with the outside. Since the inner peripheral wall of the shaft hole and the outer peripheral surface of the shaft of the vibrator are covered with an oil film, the vacant room is almost kept in a sealed state, and during operation of the vibrator, the shaft increases as the shaft enters the vacant room. Extra driving force is required because it is required to move against the indoor air pressure, and the amount of reciprocating movement of the vibrator, that is, the stroke length is reduced due to the resistance of the air pressure. Which leads to deterioration of the pump performance.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and the invention according to claim 1 has a diaphragm provided on one side with a fixing member having a through hole at the center. A main body case provided with a suction / compression chamber and an iron core storage chamber, and a pair of laminated iron cores housed in the iron core storage chamber with a drive coil mounted thereon and comprising a yoke part and magnetic poles with their magnetic poles spaced apart and opposed to each other. A frame having a permanent magnet and shafts provided at both ends of the frame in the reciprocating direction and passing through through holes of a fixing member provided in the diaphragm, and the permanent magnet is disposed between the magnetic poles. A vibrator provided, a concave empty chamber formed on a side wall of the suction / compression chamber and opening the suction / compression chamber side, and a tip of a shaft of the vibrator provided in the opening of the empty chamber. Bearings to support, said vacant space and front It is obtained by an electromagnetic pump having a communication passage for communicating the suction-compression chamber.

[0012] Thus, the invention according to claim 1 provides an inhaler
A concave vacant chamber formed on the side wall of the compression chamber and opening the suction / compression chamber side is provided, a bearing is provided in the opening of the vacant chamber, and a tip end of the shaft of the vibrator is supported by the bearing, and Since the vacant chamber and the suction / compression chamber are communicated with each other through the communication passage, the vibrator can be accurately arranged between the mutually facing magnetic poles of the laminated core, and the vibrator enters the vacant chamber with the reciprocating operation of the vibrator. When the air pressure in the chamber increases due to the shaft, the internal air flows into the suction / compression chamber through the communication passage, so that the air pressure in the chamber does not increase and the reciprocating motion of the vibrator can be made smooth. It has.

According to a second aspect of the present invention, in the first aspect of the invention, the bearing is an electromagnetic pump formed of a fluororesin.

According to the second aspect of the present invention, since the bearing is formed of a fluororesin in the first aspect of the present invention, in addition to the effect of the first aspect of the present invention, during the reciprocating operation of the vibrator. This has the effect of preventing oil from scattering and preventing the diaphragm or the case from deteriorating due to the oil scattering.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIGS.

As shown in FIG. 1, the electromagnetic pump comprises a main case 10 constituting a main body case 1, and a main case 10
The suction chamber 21 and the discharge chamber 2 which will be described later are attached to the left and right in FIG.
The main case 10 includes a pair of sub-cases 20 provided with three or the like, a laminated core 30 to which a drive coil 32 disposed in the main case 10 is attached, a vibrator 50, and the like.

The main case 10 is provided with an intake port 11 which is open to the outside and inhales a fluid (gas or liquid), and has a core storage chamber in which a laminated core 30 described later is disposed. 12, the iron core storage room 1
2, that is, an elliptical opening 13 having a major axis in a direction perpendicular to the plane of FIG.
Are formed. An annular fitting groove 13b is formed in the edge 13a of the opening 13.

A pair of laminated iron cores 30 formed by stacking E-shaped iron cores in a direction perpendicular to the plane of the drawing in the figure have a central magnetic pole 31 and side magnetic poles 31 in the iron core storage chamber 12.
The magnetic poles of the laminated core 30 are attached to each other by forming a predetermined gap G by opposing the magnetic poles made of a and a predetermined distance from each other.
a, 31a, a central magnetic pole 31 is provided with a winding frame 32.
A drive coil 32 wound around a is attached.
The laminated core 30 has three mounting screws 3 each.
3 attached to the main case 10. In addition,
The driving coil 32 and the laminated core 30 constitute driving means. An AC power supply (not shown) is connected to the drive coil 32 so that an AC current is supplied.

Next, a diaphragm 40 attached to the opening 13 of the main case 10 and the diaphragm 40
The fixing plate 43 as a fixing member to be attached to the device will be described.

The diaphragm 40 is formed of a soft elliptic plate-like member such as rubber (see FIG. 4), and its outer peripheral edge is formed in an annular shape which fits into a fitting groove 13b formed in an edge 13a of the opening 13. 3, a through hole 42 is formed in the center as shown in FIG. 3, 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
2 is composed of two plates 44 and 45 made of synthetic resin, and one of the plates 44 located on the iron core storage chamber 12 side has a through hole 42 of the diaphragm 40. A fitting groove 44a for fitting with the annular fitting rib 42a formed at the edge of the hole is formed. The other plate 45 has an annular fitting step 45a fitted into the through hole 42, and has a central portion through which a shaft is inserted corresponding to a shaft insertion hole 44b formed in the plate 44. A hole 45b is formed.

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 with the fitting groove 44a into the fitting rib 42a formed at the edge of the through hole 42 of the diaphragm 40, and then the fitting step portion of the other plate 45 is fitted. 45a to the through hole 42
And the diaphragm 40 is clamped between the plates 44 and 45. In this state, the plates 44 and 45 are
And by bonding or welding the diaphragm 40.

Next, the oscillator 50 disposed between the gaps G formed between the magnetic poles of the pair of laminated cores 30 will be described. As shown in FIG. 4, the vibrator 50 is made of a synthetic resin and has a rectangular base 51, a pair of permanent magnets 52, 52 embedded and mounted on the base 51, and provided at both ends of the base 51. And a screw shaft 53 attached to the convex portion 54. Note that the protrusion 5
4 is one of the fixed plates 43 of the fixed plate 43.
It is the positioning surface of.

When the diaphragm 40 to which the fixed plate 43 is attached is attached to the vibrator 50, one of the screws of the oscillator 50 is inserted into the shaft insertion holes 44 b and 45 b of the fixed plate 43 attached to the diaphragm 40. After the shaft 53 is inserted, the supporting shaft 57 (see FIG. 2) serving as a shaft having a female screw 57 a screwed to the screw shaft 53 is screwed into the screw shaft 53, whereby the diaphragm 40 becomes one of the screw shafts 53 of the vibrator 50. Attached to. The screw shaft 53 and the support shaft 57 constitute the shaft of the vibrator 50.

When the vibrator 50 in which the diaphragm 40 is attached to the one-side screw shaft 53 of the vibrator 50 as described above is disposed in the main case 10, the vibrator 50 is connected to the other side. The screw shaft 53 is inserted through the opening 13 of the main case 10, and the other screw shaft 53 is attached to the fixed plate 43 attached to the other diaphragm 40 by the same procedure as in the case of the one side. The other diaphragm 40 is attached by screwing the support shaft 57 to the screw shaft 53 on the other side.

The screw shafts 53 at both ends of the vibrator 50
After the diaphragm 40 is attached to the main case 10 via the fixing plate 43, the fitting rib 41 formed on the outer peripheral portion of the diaphragm 40 is fitted into the fitting groove 13b formed on the rim 13a of the opening 13 of the main case 10, Next, the diaphragm 40 is attached to the opening 13 of the main case 10 by attaching the outer peripheral portion of the diaphragm 40 to the opening 13 and holding the same by the flange portion of the sub-case 20 described in detail below.

The diaphragm 40 is connected to the main case 10.
When the sub case 20 is attached to the main case 10 and the sub case 20 is attached to the main case 10, the vibrator 50 is supported by a bearing 70, which will be described in detail later, with a pair of permanent magnets attached to a base 51 thereof. The magnets 52, 52 are located within a gap G formed between the magnetic poles of the pair of laminated cores 30.

The vibrator 50 is connected to the pair of laminated cores 30.
When an AC current is supplied from an AC power supply to the coil winding 32b of the drive coil 32 in a state where the coil winding 32b is located within the gap G formed between the salient poles, an alternating magnetic field is generated by the coil winding 32b. This alternating magnetic field acts on the permanent magnet 52 of the vibrator, and the vibrator 50 vibrates in the left-right direction in the figure, and the vibration of the vibrator 50 causes the diaphragm 40 to reciprocate in the left-right direction in FIG. Is what you do.

Next, a description will be given of the sub case 20 which is attached so as to close both ends of the main case 10, that is, the opening 13. As shown in FIG. 1, this sub-case 20 has an opening 24 at one end and a bottom wall 25 at the other end, and is formed in a dish shape surrounded by an outer peripheral wall 26 integrally formed with the bottom wall 25. A flange 24a is formed at the opening edge of the opening 24 for attachment to the edge 13a of the opening 13 of the main case 10. The flange 24a is attached to the edge of the main case 10 by a mounting screw (not shown). The sub case 20 is attached to the main case 10 by being attached to the portion 13a. When the sub case 20 is attached with the opening 13 of the main case 10 closed with the diaphragm 40 interposed therebetween, the diaphragm 40 to which a fixing plate for closing the opening 24 is attached, and the outer peripheral wall 26 are attached. The suction and compression chamber 22 is formed by the bottom wall 25. The suction / compression chamber 22 is partitioned by a bottom wall 25, and a discharge chamber 23 having a suction chamber 21 and a discharge port 23a is formed adjacent to the suction / compression chamber 22.
The suction / compression chamber 22 communicates with a discharge hole 27 formed in the bottom wall 25, and the discharge hole 27 is provided with a discharge valve 28 for opening and closing the discharge hole 27. The suction chamber 21 and the suction / compression chamber 22 communicate with each other through a suction port 29 formed in the bottom wall 25. The suction port 29 has a suction valve 29a for opening and closing the suction port 29. Is provided.

The suction chamber 21 communicates with the iron core storage chamber 12 through a communication hole 11a provided in the main case 10 and the sub case 20. That is, the suction chamber 21 communicates with the intake 11 through the communication hole 11 a and the iron core storage chamber 12.

The sub-case 20 is formed on the bottom wall 25, that is, the side wall of the suction / compression chamber 22 which will be described later, facing the axis of the vibrator 50 and opens the suction / compression chamber 22 side. A concave space 60 having a space 61 as its interior is formed.

The bearing 70, which is positioned by the positioning step 62 and is made of fluororesin, is attached to the opening of the empty space 60. As shown in FIG. 2, a groove 71 is formed as a communication passage formed along the axial direction.

The space 71 of the vacant chamber 60 and the suction / compression chamber 22 communicate with each other by the groove 71. As a result, the support shaft 57 is
The tip of the space 61
When the air pressure in the space 61 increases, the internal air flows into the suction / compression chamber 23 through the groove 71, so that the internal air pressure does not abnormally increase. Unlike the conventional device, an extra driving force due to an increase in the air pressure in the space portion 61 is not required, and the moving amount, that is, the stroke length of the vibrator 50 is not reduced, and the amplitude of the diaphragm 40 is not reduced. Therefore, it is possible to prevent the pump performance from lowering.

Then, as described above, the diaphragm 40
In a state where the vibrator 50 to which is attached is mounted in the main case 10 and the sub shaft 20 is mounted on the main case 10 so that the support shaft 57 is supported by the bearing 70,
The vibrator 50 has a support shaft 57 supported by a bearing 70, and a permanent magnet 52 is accurately disposed in a gap G formed between both magnetic poles of the laminated iron core 30.

Next, the operation of the electromagnetic pump configured as described above will be described with reference to FIG. The suction chamber 2
1. Since the configurations and operations of the suction / compression chamber 22 and the discharge chamber 23 are the same for the left and right, only the left side will be described here, and the right side will not be described.

First, when power is supplied by connecting an AC power supply (not shown) to the drive coil 32, an alternating magnetic field is generated, and the alternating magnetic field is generated by the vibrator 50 through the salient poles of the laminated core 30.
The vibrator 50 vibrates in the left-right direction in FIG. If the vibrator 50 now moves to the right in the figure due to the alternating magnetic field, the diaphragm 40 also moves to the right in the figure. As a result, the volume of the suction / compression chamber 22 increases and the inside of the suction / compression chamber 22 increases. As a result, the suction valve 29 a opens the suction hole 29, and the discharge valve 28 operates to close the discharge hole 27, so that the iron core storage chamber 12 communicating with the intake port 11 is closed. Flows into the suction / compression chamber 22 through the suction hole 29.

Next, the polarity of the alternating magnetic field changes, and the vibrator 5
0 moves to the left in the figure, the diaphragm 40 moves to the left in the figure, and as a result, the volume of the suction / compression chamber 22 decreases, and at the same time, the suction valve 29a closes the suction hole 29, and the discharge valve 28 Operates to open the discharge hole 27, and the fluid in the suction / compression chamber 22 is discharged from the discharge hole 2.
7, the ink is discharged from the discharge holes 22a through the discharge chamber 23.

The above operation is repeated by the movement of the vibrator 50 oscillating in the left-right direction by the alternating magnetic field generated in response to the AC power supplied to the drive coil 32, and the fluid flows into the main case 10, that is, the main body case. 10 to the iron core storage chamber 12 and the suction chamber 2
The gas is discharged from a discharge port 23a opened to the outside of the main body case 10 through one suction hole 29, the suction / compression chamber 22, and the discharge chamber 23. By repeating this operation, the fluid is suctioned from the suction port 11 and discharged from the discharge port 23a.

In the driving state of the electromagnetic pump, the vibrator 50 reciprocates in the axial direction at a high speed in accordance with the frequency determined by the power supply frequency. The intrusion and retreat of the space 61 are repeated. However, when the tip of the support shaft 57 rapidly enters the space 61 and the air pressure in the space 61 suddenly increases, the air in the space 61 becomes It flows out into the suction / compression chamber 22 through the groove 71 instantaneously. Therefore, as described above, it is possible to prevent the air pressure in the space 61 of the empty room 60 from increasing, and to improve the reciprocating motion of the vibrator 50, thereby preventing the pump performance from lowering.

Further, since the bearing 70 is formed of a fluororesin having a small friction coefficient, the sliding in the shaft hole of the support shaft 57 is satisfactorily performed, and oil is not scattered. Even when the sub case 20 is formed of a synthetic resin, the diaphragm 40 or the sub case 20 does not deteriorate.

In the above embodiment, the bearing 7
Although the groove 71 as a communication passage is formed in the shaft 70, the groove 71 is not provided in the bearing 70 but is formed by a groove formed along the axial direction on a surface of the support shaft 57 that slides with the bearing 70. Alternatively, it may be constituted by a groove formed along the axial direction on the outer peripheral surface of the bearing 70, and further reaches the inner peripheral surface of the empty room 60, that is, the space 61 on the peripheral wall where the bearing 70 is fitted. It may be constituted by a groove formed as described above.

The point is that any structure may be used as long as the space 61 communicates with the suction / compression chamber 22.

When the inner peripheral surface of the empty space 60, that is, the peripheral wall in which the bearing 70 is fitted, is formed by a groove formed so as to reach the space 61, the processing of the bearing 70 or the support shaft 57 becomes easy. At the same time, there is an advantage that abrasion of the bearing 70 or the support shaft 57 can be prevented as compared with the case where the groove is formed.

In the above embodiment, the bearing 70 is made of a fluorine resin. However, when the diaphragm 40 is made of an oil-resistant member, the bearing 70 may be made of an oil-impregnated metal.

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 may be provided on only one of the vibrators.

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

[0047]

As described above, according to the first aspect of the present invention, a concave vacant chamber formed on the side wall of the suction / compression chamber and having an opening on the suction / compression chamber side is provided, and a bearing is provided in the opening of the vacant chamber. Since the tip of the shaft of the vibrator is supported by the bearing and the vacant chamber and the suction / compression chamber are communicated with each other by a communication passage, the vibrator is located between the mutually facing magnetic poles of the laminated core. In addition to being able to be arranged with high accuracy, if the air pressure in the air chamber increases due to the shaft that enters the air chamber with the reciprocating operation of the vibrator, the air inside the air flows out into the suction / compression chamber through the communication path, and This has the effect that the reciprocating motion of the vibrator can be made smooth without increasing the indoor air pressure.

According to a second aspect of the present invention, in the first aspect of the present invention, since the bearing is formed of a fluororesin, the effect of the first aspect is provided. There is no oil splattering, and the effect of preventing the diaphragm or the case from being deteriorated due to the oil splattering can be prevented.

[Brief description of the drawings]

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

FIG. 2 is an exploded perspective view of the vibrator, the support shaft, and the bearing according to the embodiment.

FIG. 3 is a perspective view showing a state in which a fixing plate is attached to the diaphragm according to the embodiment.

FIG. 4 is a perspective view showing a state where a diaphragm is attached to the vibrator of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body case 10 Main case (part of main body case) 12 Iron core storage room 20 Subcase (part of main body case) 22 Suction / compression chamber 30 Laminated iron core (part of drive means) 32 Drive coil (one of drive means) Part) 40 diaphragm 43 fixing plate (fixing member) 50 vibrator frame 51 permanent magnet 53 vibrator screw (support shaft) 57 support shaft (vibrator shaft) 60 vacant space 70 bearing 71 bearing groove (communicating passage) )

Claims (2)

[Claims] 1. A body case provided with a suction / compression chamber and an iron core storage chamber provided on one side with a diaphragm provided at a central portion having a fixed member having a through hole, a drive coil mounted, and a yoke portion. A pair of laminated iron cores which are made up of magnetic poles and are mutually opposed to each other and stored in the iron core storage chamber, a frame having permanent magnets, and fixed to the diaphragm provided at both ends of the frame in the reciprocating direction of the frame; A vibrator comprising a shaft penetrating through the through-hole of the member and disposed with the permanent magnet positioned between the magnetic poles; and a concave formed on a side wall of the suction / compression chamber and opening the suction / compression chamber side. An air chamber, a bearing provided in the opening of the air chamber to support a tip of a shaft of the vibrator, and a communication path for communicating the air chamber with the suction / compression chamber. Characteristic electromagnetic pump. 2. The electromagnetic pump according to claim 1, wherein the bearing is formed of a fluororesin.