JPH08135576A - Vibration type diaphragm pump - Google Patents

Abstract

PURPOSE: To mount a bearing, by which a vibrator is supported, by the less number of parts and to form an electrode part in a compact manner by a method wherein the vibrator is axially vibrated through magnetic relative operation with an electromagnetic coil to drive a diaphragm and a bearing sliding over the inner peripheral surface of the electromagnetic coil is arranged on the outer periphery of a permanent magnet. CONSTITUTION: In a diaphragm pump, when two electromagnetic coils 110 are charged with an alternating current, the inner right and left end parts of the electromagnetic coil 110 are magnetized into an N-pole or an S-pole in synchronism with the change of the alternating current and a vibrator 100 is axially vibrated through a repulsion force against or a suction force to a pole piece 102. Through vibration of the diaphragm coupled to the vibrator 110, air sucked in a pump chamber is discharged. In a so formed pump, a bearing 1 sliding over the inner peripheral surface of the electromagnetic coil 110 the outer shell of which forms a core 113 is arranged on the outer periphery of a permanent magnet 101, of which the vibrator 100 consists, in the vicinity of a coupling part between the two electromagnetic coils 110. This constitution supports the vibrator 100.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration type diaphragm pump. More specifically, the number of parts can be reduced, the dimension (gap dimension) between the outer peripheral surface of the vibrator and the inner peripheral surface of the electromagnetic coil can be accurately maintained, and the power factor can be improved, and The present invention relates to a vibration diaphragm pump capable of reducing the size of an electrode section.

[0002]

2. Description of the Related Art Various vibration diaphragm pumps have heretofore been proposed which utilize the fact that a vibrator provided with a permanent magnet and connected to a diaphragm vibrates based on the magnetic interaction between an electromagnet and a permanent magnet. In such a pump, one wall of the pump chamber is formed by a diaphragm, and the vibration of the diaphragm causes the pump chamber to be compressed and expanded to suck and discharge the fluid into the pump chamber. FIG. 11 shows such a vibration type diaphragm pump (hereinafter,
This is simply referred to as a pump).

This pump comprises a vibrator 100, an electromagnetic coil 110, a diaphragm 120 and a pump portion 121, and each element is constructed as follows.

The vibrator 100 comprises a permanent magnet 101, magnetic pole pieces 102 that are excited by the two poles of the permanent magnet 101, and a shaft 103 that supports them. Both ends of the shaft 103 are connected to the diaphragm 120 and are supported by the diaphragm 120. The vibrator 100 vibrates in the axial direction according to the change in the magnetic pole of the electromagnetic coil 110.

The electromagnetic coil 110 comprises a bobbin 111, a conductive wire 112 wound around the bobbin 111, and an iron core 113 containing these. The electromagnetic coil 110 is arranged so that the pole piece 102 of the vibrator 100 is located inside thereof. Further, in the diaphragm pump of the type shown in FIG. 3, since there is one permanent magnet 101 and two pole pieces, two electromagnetic coils 110 are provided correspondingly.
One is provided. In that case, the adjacent electromagnetic coils 11
At 0, the currents flowing through the conducting wire 112 are wired so as to flow in opposite directions, whereby the magnetic poles appearing at the ends of the iron core 113 repel each other. The electromagnetic coil 110 is fixed inside a cylindrical casing 131.

The diaphragm 120 is made of an elastomer such as EPDM (ethylene propylene rubber) and has elasticity.

The pump portion 121 has a first diaphragm base 122 and a second diaphragm base 123 for gripping the outer peripheral portion of the diaphragm 120 (only the left side of the drawing is shown, but the right and left sides of the drawing are also mounted symmetrically). The second diaphragm base 123 is the diaphragm 1
A pump chamber 124 that is compressed and expanded by the vibration of 20;
A suction chamber 125 and a discharge chamber (not shown) are formed. A suction valve 126 is provided between the suction chamber 125 and the pump chamber 124.
Is provided, and a discharge valve (not shown) is provided between the discharge chamber and the pump chamber 124.

In the diaphragm pump having such a structure, when an alternating current is passed through the two electromagnetic coils 110, the inner left and right ends (in FIG. 11) of the electromagnetic coil 110 are N pole or S in synchronization with the change of the alternating current. Magnetized to poles. In FIG. 11, for example, if the N pole is excited for a certain half period, the N pole pole piece 102 magnetized by the permanent magnet 101 repels it and the S pole pole piece 102 is attracted. To be done. Since both the repulsive force and the attractive force are directed in the same direction (arrow direction), the vibrator 100 moves in the arrow direction.

When the vibrator 100 moves to the right side of FIG. 11,
The diaphragm 120 on the right side compresses the pump chamber 124 (the right side is not shown), and air is discharged from the pump chamber 124. At the same time, the left diaphragm 120
Expands the pump chamber 124 and sucks air from the suction port 127. During the next half cycle, the electromagnetic coil 11
The inner left and right ends of 0 are magnetized to the S pole, the oscillator 100 moves in the opposite direction, and suction and discharge are performed in the opposite pump chamber 124.

Usually, in this type of pump, the diaphragm 120 itself has the ability (strength) to support the vibrator 100, and therefore the diaphragm 120 alone is used.
It is also possible to support. However, if the magnet has a strong force or the size of the air gap is small and the attraction force of the magnet is stronger than the supporting force of the diaphragm 120, the diaphragm 120 alone cannot support the magnet.
Therefore, some bearings 150 are provided as shown in FIG.

[0011]

However, as shown in FIG.
As shown in FIG. 2, the bearing 150 of the type that is directly fitted to the shaft 103 requires a bracket 151 for supporting the bearing 150, and a space for this is also required, so that the electrode part can be made compact. There is a problem that it cannot be achieved.

Further, depending on the mounting accuracy of the bracket 151, it is not possible to keep the air gap size uniform over the entire circumference, and the vibration is biased to accelerate the deterioration of the diaphragm or to cause the pole piece to come into contact with the iron core. There is also a problem in that noise is generated, and in some cases, these are adsorbed and the pump does not operate.

In view of the above circumstances, the present invention is equipped with a bearing that supports the vibrator with a small number of parts, and makes the air gap size affecting the magnetic flux density uniform over the entire circumference to improve pump performance and compact electrode part. It is an object of the present invention to provide a pump that can be realized.

[0014]

A pump of the present invention comprises a disk-shaped permanent magnet, magnetic pole pieces provided on both poles of the permanent magnet, and a shaft supporting the permanent magnet and the magnetic pole piece and connected to a diaphragm. A vibrator and a cylindrical electromagnetic coil arranged around the vibrator are provided, and the vibrator vibrates in the axial direction by magnetic interaction with the electromagnetic coil to drive the diaphragm. A configured pump, characterized in that a bearing that slides on the inner peripheral surface of the electromagnetic coil is provided on the outer circumference of the permanent magnet.

Further, it is characterized in that a bearing which slides on the outer circumference of the magnetic pole piece is provided on the inner circumference of the electromagnetic coil.

Further, an inner cylindrical bearing that slides on the inner peripheral surface of the electromagnetic coil is provided on the outer circumference of the permanent magnet, and an outer cylindrical bearing that slides on the outer circumference of the magnetic pole piece is formed on the inner circumference of the electromagnetic coil. The inner peripheral surface of the outer cylindrical bearing and the outer peripheral surface of the inner cylindrical bearing are alternately provided with irregularities at positions where both bearings do not interfere with each other.

[0017]

In the pump of the present invention, a bearing is provided on the permanent magnet forming the vibrator, and the bearing is slid on the inner peripheral surface of the electromagnetic coil.

Further, a bearing is provided on the inner circumference of the electromagnetic coil, and the magnetic pole piece constituting the vibrator is slid on the bearing.

Further, bearings are provided on both the vibrator and the electromagnetic coil so that they do not collide with each other due to the concavities and convexities alternately provided at positions where they do not interfere with each other.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The pump of the present invention will be described below with reference to the accompanying drawings.

1 to 3 are explanatory views of an embodiment of the pump of the present invention according to claim 1, FIGS. 4 to 6 are explanatory views of an embodiment of the pump of the present invention according to claim 2, and FIG. Claim 1
FIG. 8 is an explanatory view of a pump of the present invention according to claim 2, and FIGS. 8 to 10 are explanatory views of an embodiment of the pump of the present invention according to claim 3.

FIG. 1 is a perspective explanatory view of an embodiment of the pump of the present invention according to claim 1, and FIG. 2 is a cross-sectional explanatory view of an essential part of FIG.

The present invention is different from the prior art in that the bearing 1 which slides on the inner peripheral surface of the electromagnetic coil 110 is provided on the outer circumference of the permanent magnet 101 which constitutes the vibrator 100. The outer shell of the electromagnetic coil 110 is formed by the iron core 113, and the bearing 1 is configured to slide near the connecting portion of the two electromagnetic coils 110 and the inner peripheral surface of the iron core 113.

The bearing 1 is made of a material suitable as a dry bearing, for example, fluorine resin, carbon (graphite),
Polyamide resins such as nylon and the like, which have properties such as heat resistance, low friction and low wear, are preferable. In addition, it is preferable that the shape is a cylindrical shape from the viewpoint of ease of manufacturing and cost, but as shown in FIG.
Even if a groove is provided on the outer circumference of the bearing 31, the same effect can be obtained, in which case the weight can be reduced, and it is advantageous in terms of left and right ventilation cooling.

As shown in FIG. 2, the distance (gap size) G between the inner peripheral surface a of the iron core 113 and the outer peripheral surface b of the pole piece 102 is expressed by the following equation.

G = (inner diameter E of iron core−outer diameter F of magnetic pole piece) / 2 The air gap dimension G is a manufacturing dimensional error of inner and outer diameters of parts such as an iron core and a vibrator, an error due to assembly accuracy, or vibration. A certain size is necessary due to mechanical problems such as bias during vibration of the child. For example, since the diaphragm 120 is an elastic body, it expands and contracts not only in the axial direction of the vibrator 100 but also in the radial direction. For that reason
In the conventional type in which the vibrator 100 is supported only by the diaphragm 120, the gap size G is about 2 mm, and the vibrator 100 is prevented from being caught by the electromagnetic coil 110 and becoming inoperable.

On the other hand, from the magnetic problem, it is preferable that the air gap size G is as small as possible, because the magnetic resistance is small and the magnetic flux density can be increased. With such a high magnetic flux density, it is possible to reduce the axial dimension (thickness) of the permanent magnet.

However, if the air gap size G is made smaller, the problem becomes more uniform, that is, as the air gap size G is made smaller, the difference in the magnetic flux density due to the size difference becomes larger.
The difference in attraction force is likely to appear, and if an extremely small size occurs due to deviation during vibration, the iron core 113 and the pole piece 102 will stick to each other, and in the worst case, the operation will be impossible.
This is because the attractive force between the iron core and the pole pieces is proportional to the square of the magnetic flux density.

In consideration of the above magnetic and mechanical points, in the pump of this embodiment, the air gap size G is configured to be uniformly about 0.5 mm on the outer circumference of the pole piece 102. . By doing so, the vibrator 10 is driven during driving.
0 and the electromagnetic coil 110 are no longer in contact,
Vibration operation is stable. In this case, the higher the accuracy of the bearing (cylindricity, concentricity), the more uniform the magnetic flux density of the air gap over the entire circumference.
The suction force and repulsion force between 0 are made uniform over the entire circumference. Therefore, the contact force between the iron core 113 and the bearing 1 is weak,
The wear of the bearing 1 is reduced.

In order for the outer peripheral surface C of the bearing 1 to slide on the inner peripheral surface G of the iron core 113, the outer diameter D of the bearing 1 is
It must be smaller than the inner diameter E of 13. That is, the outer diameter D of the bearing 1, the inner diameter E of the iron core 113, and the pole piece 1
The relationship between 02 and the outer diameter F must be as follows.

D <E = F + 2G Further, in FIG. 2, S1 which is 1/2 of the difference between the inner diameter E of the iron core 113 and the outer diameter D of the bearing 1 is S1 = (inner diameter E of iron core−outer diameter of bearing It is represented by D) / 2 and is preferably 0.05 to 0.1 mm. Due to the problem of mechanical accuracy, if it is less than 0.05 mm, the bearing 1 may be caught by the iron core 113 during vibration, and if it exceeds 0.1 mm, mechanical contact noise becomes high.

The pump shown in FIG. 1 has only one bearing 1 as compared with the conventional pump having two brackets and two bearings shown in FIG. 11, so that the number of parts is reduced and the structure is reduced. Can be simplified and cost can be reduced.

FIG. 3 is an explanatory view of another embodiment of the pump of the present invention according to claim 1.

In the present invention, the permanent magnet 101 is not limited to one type as shown in FIG. 1, but two types or more types as shown in FIG. Is also applicable. In that case, it is preferable to provide the bearings 1 around all the permanent magnets 2 in order to vibrate well.

However, if the bearing 1 has three or more permanent magnets, it is possible to provide the bearing 1 only on the two permanent magnets at the ends. In addition, only one permanent magnet in the center has a bearing 1
It is also possible to provide.

FIG. 4 is a perspective explanatory view showing an embodiment of the pump of the present invention according to claim 2, FIG. 5 is an explanatory view of the bearing of FIG. 4, and FIG. 6 is a sectional explanatory view of an essential part of FIG.

The difference between this embodiment and the prior art is that
The point is that the bearing 11 that slides on the pole piece 102 is provided on the inner circumference of the electromagnetic coil 110. An annular groove is formed at the center of the inner circumference of the iron core 113 forming the outer shell of the electromagnetic coil 110, and the bearing 11 is preferably provided by utilizing this groove. Then, both magnetic pole pieces 102 can be slidably provided.

The bearing 11 is preferably provided on the inner peripheral surface of the bobbin 111 by utilizing the bobbin 111 for winding the conducting wire 112, as shown in FIG. Further, although the bobbin 111 and the bearing 11 may be integrally formed, it is preferable that they are separately formed from the viewpoint that the material for manufacturing the bearing 11 can be freely selected and the cost can be suppressed to a low cost. . Further, it is also preferable to make the inner peripheral surface 11a of the bearing 11 flat in terms of manufacturing ease and cost. However, as in the embodiment shown in FIG. 8 described later,
The same effect can be achieved by providing a groove on the inner circumference of the bearing 32. In this case, it is possible to reduce the weight and to ventilate left and right, which is also advantageous in terms of cooling.

The bearing 11 can be made of the same material as the bearing 1 described above. Also, in the case of the bobbin 111 integrally formed with the bearing 11, the material of the bobbin is a fluororesin or a polyamide resin, which has low friction and low wear properties and is a material with good insulation. It is effective to use a resin.

As shown in FIG. 6, also in the present invention, the distance (gap size) G between the inner peripheral surface a of the iron core 113 and the outer peripheral surface b of the pole piece 102 is 0.5 mm. preferable.

Then, the inner peripheral surface d of the bearing 11 and the pole piece 10
2, the distance S2 between the outer peripheral surface b and the outer peripheral surface b is 0.05 to 0.
It is preferably 1 mm in terms of processing and assembly.

In the pump shown in FIG. 4, the bobbin 111
When the bearing 11 is integrally formed with the bearing 11, the number of additional parts is 0, and even when the bearing 11 is formed separately from the bobbin 111, the number of additional parts is 2, which is the conventional number shown in FIG. The cost can be reduced compared to the example.

Since the accuracy of the gap size G is determined by the mounting accuracy of the bobbin 111 and the iron core 113, it is necessary to improve the manufacturing accuracy and mounting accuracy of both parts.

Further, as shown in FIG. 1, in the case where the bearing 1 is provided around the permanent magnet 101, the bearing 1 is 1
However, in the present invention according to claim 2 shown in FIG. 4, since two bearings 11 are provided, the gap dimension G
The accuracy of can be maintained more easily.

The present invention according to claim 2 is also applicable to two types of permanent magnets 2, that is, three types of electromagnetic coils 3 or more types, as shown in FIG. It is possible. In that case, the bearings 11 as shown in FIG.
Is preferably provided. Of the three or more electromagnetic coils 3, the bearings 11 can be provided on the electromagnetic coils 3 at both ends.

FIG. 7 is an explanatory sectional view of the essential parts of an embodiment of the present invention according to claims 1 and 2.

In the pump of this embodiment, the bearing 21 is provided on the outer circumference of the permanent magnet 101, and the bearing 22 is provided on the inner circumference of the electromagnetic coil 110.

In this case, it is necessary to set the distance L between them to be equal to or more than the amplitude of the vibrator so that the bearing 21 does not contact the bearing 22 during the vibration of the vibrator 100.

The pump of FIG. 7 has the advantage that the motion of the vibrator is stabilized by the bearing 22 on the electromagnet side and the electromagnet core and the pole piece of the vibrator do not come into contact with each other.

FIG. 8 is a perspective explanatory view showing an embodiment of the pump of the present invention according to claim 3, FIG. 9 is an explanatory sectional view of a main part of the pump of FIG. 8, and FIG. 10 is an outer cylinder bearing and an inner cylinder. It is explanatory drawing which shows the unevenness | corrugation of a bearing.

In the pump of this embodiment, bearings 31 and 32 are provided on both the outer circumference of the permanent magnet 101 and the inner circumference of the electromagnetic coil 110, and unevenness is provided on the outer circumference or the inner circumference so that they do not interfere with each other. ing. As a result, a total of three bearings 31, 32 are provided, and a more stable void size can be obtained.

As shown in FIG. 9, the inner cylindrical bearing 31 provided on the outer periphery of the permanent magnet 101 slides on the inner peripheral surface a of the iron core 113 near the connecting portion of the electromagnetic coil 110. Therefore, as shown in FIG.
The outer diameter R1 × 2 of a is smaller than the inner diameter of the iron core, and the difference is that S1 is 0.05 to 0.1 as shown in FIG.
mm is determined.

S1 = Inner diameter of iron core (E) −Outer diameter of convex portion (R1 × 2)

The outer cylindrical bearing 32 provided on the inner circumference of the electromagnetic coil 110 slides on the outer peripheral surface b of the pole piece 102. Therefore, as shown in FIG. 10, the inner diameter R2 × 2 of the convex portion 32a of the outer cylindrical bearing 32 is larger than the outer diameter F of the magnetic pole piece 102, and the difference therebetween is S2 as shown in FIG. 0.
It is determined to be 05 to 0.1 mm.

S2 = inner diameter of convex portion (R2 × 2) −outer diameter of magnetic pole piece (F).

Further, as shown in FIG. 10, the convex portions 31a of the inner cylindrical bearing 31 and the convex portions 32a of the outer cylindrical bearing 32 are provided so as to alternate with each other, and the convex portions 31a of the inner cylindrical bearing 31 and the convex portions 32a of the outer cylindrical bearing 32 are provided in the grooves provided on the opposite side. Rock.

The distance (gap size) G between the inner peripheral surface a of the iron core 113 and the outer peripheral surface b of the pole piece 102 is set to 0.5 mm for magnetic and mechanical reasons in this case as well. Preferably.

The pump of FIG. 8 has an advantage that the size (vibration direction) of the bearing 22 on the electromagnet side can be made larger than that of the pump shown in FIG. Therefore, when a rare earth magnet having a large energy product is used as a magnet in a pump having a relatively large flow rate (80 liters / minute to 200 liters / minute), it is effective when the magnetic flux in the air gap is increased, and a stable long life is obtained. A bearing can be configured.

[0059]

The pump of the present invention does not require other parts such as a bracket for supporting the bearing, so that the number of parts is small, the cost is low, and the size can be reduced.

Further, since the bearing holds the gap, the electromagnet iron core and the magnetic pole piece of the vibrator do not come into contact with each other during assembly and are not attracted, so that the vibrator can be easily inserted into the electromagnetic coil and the assembly can be performed. It's easy.

Further, since the distance (gap size) between the inner peripheral surface of the iron core and the outer peripheral surface of the magnetic pole piece can be kept uniform over the entire circumference, the space size can be made as small as possible to reduce the attractive force of the magnet. Can be increased. Therefore, the pump performance can be improved. Alternatively, the electrode part can be made compact.

[Brief description of drawings]

FIG. 1 is a perspective explanatory view showing an embodiment of a pump of the present invention according to claim 1. FIG.

FIG. 2 is an explanatory cross-sectional view of a main part of the pump shown in FIG.

FIG. 3 is an explanatory sectional view showing another embodiment of the pump of the present invention according to claim 1.

FIG. 4 is a perspective explanatory view showing an embodiment of the pump of the present invention according to claim 2;

5 is a perspective explanatory view of a bearing of the pump of FIG. 4. FIG.

FIG. 6 is a cross-sectional explanatory view of essential parts of the pump of FIG.

FIG. 7 is a cross-sectional explanatory view of a main part showing an embodiment of the pump of the present invention according to claims 1 and 2.

FIG. 8 is a perspective explanatory view showing an embodiment of the pump of the present invention according to claim 3;

9 is a cross-sectional explanatory view of the main parts of the pump of FIG.

10 is an explanatory diagram of irregularities of an outer cylindrical bearing and an inner cylindrical bearing of the pump of FIG.

FIG. 11 is a perspective explanatory view showing an example of a conventional pump.

[Explanation of symbols]

 1, 11 bearing 21, 22 bearing 31, 32 bearing 100 oscillator 101 permanent magnet 102 magnetic pole piece 103 shaft 110 electromagnetic coil 113 iron core 120 diaphragm

Claims (3)

[Claims] 1. A vibrator having a disk-shaped permanent magnet, pole pieces provided on both poles of the permanent magnet, and a shaft that supports the permanent magnet and the pole pieces and is connected to a diaphragm, and a vibrator around the vibrator. A vibrating diaphragm pump configured to drive a diaphragm, wherein the vibrator vibrates in the axial direction by a magnetic interaction with the electromagnetic coil, and the cylindrical electromagnetic coil is disposed. ,
A vibrating diaphragm pump, wherein a bearing that slides on the inner peripheral surface of the electromagnetic coil is provided on the outer circumference of the permanent magnet. 2. A disk-shaped permanent magnet, a magnetic pole piece provided on both poles of the permanent magnet, a vibrator including a shaft that supports the permanent magnet and the magnetic pole piece, and is connected to a diaphragm, and around the vibrator. A vibrating diaphragm pump configured to drive a diaphragm, wherein the vibrator vibrates in the axial direction by a magnetic interaction with the electromagnetic coil, and the cylindrical electromagnetic coil is disposed. ,
A vibrating diaphragm pump, wherein a bearing that slides on the outer circumference of the magnetic pole piece is provided on the inner circumference of the electromagnetic coil. 3. A disk-shaped permanent magnet, a magnetic pole piece provided on both poles of the permanent magnet, a vibrator including a shaft that supports the permanent magnet and the magnetic pole piece and is connected to a diaphragm, and around the vibrator. A vibrating diaphragm pump configured to drive a diaphragm, wherein the vibrator vibrates in the axial direction by a magnetic interaction with the electromagnetic coil, and the cylindrical electromagnetic coil is disposed. ,
An inner cylinder bearing that slides on the inner peripheral surface of the electromagnetic coil is provided on the outer circumference of the permanent magnet, and an outer cylinder bearing that slides on the outer circumference of the magnetic pole piece is provided on the inner circumference of the electromagnetic coil. A vibrating diaphragm pump, characterized in that the inner peripheral surface of the bearing and the outer peripheral surface of the inner cylindrical bearing are alternately provided with irregularities at positions where both bearings do not interfere with each other.