JP2000130340A - Electromagnetic diaphragm pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic diaphragm pump having high position accuracy with respect to the electromagnet of a vibrator and high durability. SOLUTION: This pump is constructed in such a manner that a vibrator is provided between the opposing faces of a pair of electromagnets, the vibrator is reciprocated in a direction perpendicular to the opposing directions of the electromagnets following the polarity changes of the electromagnets, and a pair of elastic diaphragms 40 are arranged in both end parts of the vibrator to oppose each other. In this case, each diaphragm 40 has a ring-like thin part 42 having a circular opening in its center part, a fixing flange part 41 provided in the outer peripheral part of the thin part 42 and a plurality of very small recessed and projecting parts provided at least in one surface in the vicinity of the circular opening. The vicinity of the circular opening of the diaphragm is held between a set of disk-like center plates 70 having very small recessed and projecting parts in opposing faces, this center plate 70 is connected and fixed to the end part of the vibrator, the flange part 41 of the diaphragm is fixed to the electromagnet case, and a valve case body separated from the electromagnet case by such a diaphragm 40 and having a suction valve and a discharge valve is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic diaphragm pump, and more particularly, to a method in which an alternating current is applied to an opposing electromagnet to reciprocate a vibrator interposed between the opposing electromagnets at the same frequency as the AC power supply. An electromagnetic type that moves and uses a deformation of a pair of diaphragms arranged opposite to both ends of the vibrator to continuously discharge compressed gas by the change in volume in the case partitioned by the diaphragm and the action of the valve The present invention relates to a diaphragm pump. Such an electromagnetic diaphragm pump is, for example, for aeration of an aeration-type septic tank, for oxygen supplementation of fish farming, for air blowing such as a bubble bath,
Used for small compressors and the like.

[0002]

2. Description of the Related Art Conventionally, an electromagnetic diaphragm pump has been used as one of pumps for aerating a septic tank or supplementing oxygen for fish farming.

[0003] Such an electromagnetic diaphragm pump is
For example, as disclosed in Japanese Utility Model Laid-Open Publication No. 2-83387, a box-shaped electromagnet case having an open top, a pair of electromagnets arranged and fixed to face each other in the electromagnet case, A vibrator interposed between the opposing surfaces of the pair of electromagnets and reciprocating with a change in the polarity of the electromagnets is provided, and a pair of diaphragms arranged to face each other are formed at both ends of the vibrator. Have been.

In an electromagnetic diaphragm pump, a vibrator reciprocates in accordance with a change in polarity of an electromagnet, and a diaphragm connected to the vibrator vibrates.
The operation of sucking external air into the compression chamber and compressing and discharging the sucked air acts so as to be continuously repeated.

[0005]

The diaphragm used in such an electromagnetic diaphragm pump is a rubber-made member formed into a thin disk-shaped thin film having a fixing flange on the outer periphery and an opening in the center. is there. In this diaphragm, the outer peripheral flange portion is fixed to the electromagnet case,
A set of disk-shaped center plates is mounted in the center opening, and connected and fixed to the end of the vibrator via the center plate. Conventionally, when the center plate is mounted, one or two positioning concave portions (or convex portions) provided in the opening of the diaphragm are engaged with positioning convex portions (or concave portions) provided in the center plate. Thus, the vicinity of the opening of the diaphragm is compressed and held by the center plate from both sides.

However, as described above, every time the diaphragm vibrates due to the reciprocating motion of the vibrator, stress acts on the portion of the diaphragm that is compressed and held by the center plate and on the flange portion fixed to the electromagnet case. . Due to such stress, the concave portion (or convex portion) for positioning the diaphragm is deformed. In particular, in a portion which is compressed and held by the center plate near the opening portion of the diaphragm, the center plate is loosened due to aging. As a result, there is a problem that the positional accuracy of the vibrator with respect to the opposing surfaces of the pair of electromagnets is reduced, and the electromagnets and the vibrator eventually come into contact with each other, causing play or stopping operation.

In order to prevent the center plate from being loosened due to the above-mentioned aging, if the center plate is strongly compressed and held in the vicinity of the opening of the diaphragm, the boundary between the center plate and a portion where the diaphragm is not compressed and held is increased. In this case, there is a problem that wear and bending fatigue are advanced, and the durability of the diaphragm is significantly reduced.

The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to provide a fixed position accuracy between the center plate and the diaphragm which is high and stable, and a position accuracy of the vibrator with respect to the electromagnet. An object of the present invention is to provide a high-durability electromagnetic diaphragm pump.

[0009]

In order to achieve the above object, the present invention provides a case-shaped electromagnet case, a pair of electromagnets arranged in the electromagnet case so as to face each other, and a pair of electromagnets. With the change in polarity of the electromagnet interposed between the opposing surfaces of the electromagnets, a vibrator that reciprocates in a direction perpendicular to the opposing direction of the electromagnet, and a pair of vibrators arranged to oppose both ends of the vibrator An electromagnetic diaphragm pump having a diaphragm having elasticity and a valve case main body having a suction valve and a discharge valve separated by the diaphragm, wherein the diaphragm has a ring-shaped thin film having a circular opening in a central portion. And a fixing flange provided on the outer peripheral portion of the thin film portion, at least one surface near the circular opening of the thin film portion has a plurality of minute irregularities, and the minute Having a fine concavo-convex structure corresponding to the convex 1
A configuration in which a set of disk-shaped center plates sandwiches the vicinity of the circular opening, the center plate is connected and fixed to an end of the vibrator, and a flange of the outer peripheral portion is fixed to the electromagnet case. And

The present invention also provides a case-shaped electromagnet case,
A pair of electromagnets arranged to face each other in the electromagnet case, and reciprocating in a direction perpendicular to the opposing direction of the electromagnets with the change in polarity of the electromagnets interposed between the opposing surfaces of the pair of electromagnets. An electromagnetic diaphragm pump including a vibrator, a pair of elastic diaphragms disposed opposite to both ends of the vibrator, and a valve case main body having a suction valve and a discharge valve, the valve being separated by the diaphragm. Wherein the diaphragm is provided at a ring-shaped thin film portion having a circular opening at a central portion, a fixing flange portion provided at an outer peripheral portion of the thin film portion, and a peripheral portion of the circular opening portion. The bead portion has a plurality of fine irregularities on at least one upper surface, has a ring-shaped groove portion corresponding to the shape of the bead portion on the opposing surface, and has a front portion in the groove portion. The bead portion is sandwiched between a set of disk-shaped center plates having minute irregularities corresponding to minute irregularities, the center plate is connected and fixed to an end of the vibrator, and the flange portion of the outer peripheral portion is formed of the electromagnet. The configuration was such that it was fixed to the case.

In the present invention, the diaphragm has at least six fine protrusions having a width of at least 3 mm or less.

Further, the present invention is configured such that at least one center plate of the pair of center plates is provided with a convex portion for regulating a gap on a surface facing the center plate.

Further, according to the present invention, a bar-shaped projection for positioning and engagement is provided on one of the opposite surfaces of the pair of center plates, and a through-hole for positioning and engagement is provided on the opposite surface of the other center plate. Such a configuration was adopted.

In the present invention, at the sandwiching portion of the diaphragm sandwiched by the set of disk-shaped center plates, the minute irregularities provided on the diaphragm are engaged with the minute irregularities provided on the center plate. Even when stress is applied to the sandwiched portion by the vibration of the diaphragm due to the reciprocating motion of the child, the stress is dispersed at the engagement portion between the plurality of minute irregularities and the minute unevenness, and the fixed position accuracy between the center plate and the diaphragm is maintained. Works.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view schematically showing a state in which an electromagnetic diaphragm pump 1 of the present invention is disassembled into individual main parts.

FIG. 2 is a sectional front view showing essential parts of the main part of the electromagnetic diaphragm pump of the present invention.
FIG. 1 is a cross-sectional plan view showing a necessary portion of a main part of an electromagnetic diaphragm pump of the present invention.

As shown in FIG. 1, the lower tank container 5
A plate-shaped bottom base plate 7 is attached and fixed to the upper surface of the base plate so as to be in a sealed state. An electromagnet case 10 is installed on the plate-shaped bottom base plate 7 near the approximate center thereof. The electromagnet case 10 is not generally placed directly on the bottom base plate 7 but is installed, for example, via a vibration-proof rubber 9 so that a cushioning effect is substantially exerted. In the case of the present embodiment, the electromagnet case 10 is an electromagnet case body 11 having a bottomed container shape having an opening.
And a plate-shaped electromagnet case lid 1 for covering the opening.
5 is constituted.

The electromagnet case 10 is provided between a pair of electromagnets 21 and 25 disposed to face each other, and the electromagnet case 10 is interposed between the opposing surfaces of the pair of electromagnets 21 and 25. A vibrator 30 that reciprocates in a direction perpendicular to the opposite direction is inserted. Further, the vibrator 30
The connecting shafts 31 are fixedly arranged at both ends of the vibrator 30, whereby a pair of diaphragms 40 facing the both ends of the vibrator 30 are arranged.

At the center of the diaphragm 40, a diaphragm electromagnet-side center plate 70 and a diaphragm valve case-side center plate 80 are provided.
Are fixed in a state in which the vibrator 30 (the coupling shaft 3
1, 31) are fixed.

The outer peripheral surface of the diaphragm 40 is fixed to the side surface of the electromagnet case 10, and the valve case main body 50 and the valve case cover 60 are pressed so as to press the diaphragm 40.
Are fixed to both sides of the electromagnet case 10.

The valve case lid 60 has a hose connecting portion 61 protruding to the outside. The upper port 91 of the L-shaped rubber hose 90 is inserted into the connecting portion 61, and the lower port 95 of the L-shaped rubber hose 90 is connected to the bottom. It is inserted into the hole 7a of the base plate 7.

The electromagnet case 10 arranged on the bottom base plate 7 in this way and the above-mentioned main members fixed thereto are completely covered by the outer case 100, and the bottom of the outer case 100 is usually Are fixed in a hermetically sealed state while being in contact with the peripheral edge of the lower tank container 5 or the peripheral edge of the bottom base plate 7. Outer case 100
Has an air filter (not shown) at its upper part, and external air is supplied to the outer casing 10 through the air filter.
The air filter is fixed by the air filter cover 101 so as to flow into the inside of the air filter.

Next, the basic structure of the electromagnetic diaphragm pump of the present invention will be described in more detail with reference to FIGS.

As shown in FIGS. 2 and 3, a pair of electromagnets 21 and 25 arranged opposite to each other
Type electromagnet cores 22 and 26 and electromagnet coils 23 and 27
Are wound around the electromagnet bobbins 24 and 28. The electromagnet bobbins 24 and 28 each have a flange 2 at each end.
The electromagnet bobbins 24 and 28 are assembled in a cylindrical shape having 4a and 28a inserted into the central cores 22a and 26a of the E-shaped electromagnet cores 22 and 26, respectively. Electromagnet coil 2 of electromagnets 21 and 25
An AC power supply is connected to 3, 27 so that the number of magnetic pole changes (polarity changes) occurs the same number of times as the frequency of the AC power supply.

In such a gap between the opposing surfaces of the pair of electromagnets 21 and 25, a vibrator 30 that reciprocates in accordance with a change in polarity of the electromagnets 21 and 25 is mounted so as not to contact the electromagnets. In the case of the present embodiment, the vibrator 30 has a plate body 35 and connection shafts 31 formed at both ends thereof, and the plate body 35 has four rectangular permanent magnets having different polarities. The magnets 36, 36 (for example, N
), 37, 37 (for example, S pole) are buried.

At both ends of the vibrator 30, a pair of disc-shaped elastic bodies (for example, rubber) 40 having a center hole are arranged so as to face each other.
Is fixed to the electromagnet case 10 so as to be sandwiched by the valve case main body 50. The inner peripheral portion 45 of the diaphragm 40 is fixed while being sandwiched between a diaphragm electromagnet side center plate 70 and a diaphragm valve case side center plate 80, and the vibrator 30 is fixed to these coupling plates 70, 80. (It is screwed at the tip of the connecting shaft 31, 31).

As shown in FIG. 3, the electromagnet case 10
Case body 50 and valve case lid 60 secured to
Thus, an intake chamber 150 is formed.
Communicates with the inside of the electromagnet case 10 through a communication hole 59. An intake valve 120 is mounted on the intake-side outer wall 51 of the valve case main body 50 that partitions the intake chamber 150 from inside. By the valve action of the suction valve 120, air is sucked into the diaphragm chamber 160 through the valve vent 121 formed in the outer wall 51. The diaphragm chamber 160 includes the diaphragm 40 and the intake-side outer wall 51 of the valve case body 50.
And a discharge side outer wall 55, and a discharge valve 130 is mounted on the discharge side outer wall 55 from the outside. Due to the valve action of the discharge valve 130, the discharge side outer wall 5
The air in the diaphragm chamber 160 is discharged to the discharge chamber 170 through the valve ventilation hole 131 formed in the fifth chamber 5. The air discharged into the discharge chamber 170 passes through the L-shaped rubber hose 90, enters the lower tank container 5, and
It is discharged through the discharge port 5a (FIG. 1).

The valve action of the suction valve 120 and the discharge valve 130 is performed based on the following operation. In other words, the vibrator 30 reciprocates in the directions indicated by arrows (a) and (b) at the same frequency as the AC power supply in accordance with the polarity change of the electromagnets 21 and 25 connected to the AC power supply. The diaphragms 40 disposed at both ends of the vibrator 30 in synchronization with the movement of the vibrator 30 deform around the center of the diaphragm 40 with the same displacement as the stroke of the vibrator 30. As a result, the capacity of the diaphragm chamber 160 changes, and if attention is paid to the diaphragm chamber 160 on the right side in FIG. 3, when the diaphragm 40 is deformed in the direction of the arrow (a), the diaphragm chamber 160 expands to a negative pressure. Become
The suction valve 120 opens, and air is sucked into the diaphragm chamber 160. Conversely, when the diaphragm 40 is deformed in the direction of the arrow (b), the diaphragm chamber 160 is compressed to a positive pressure, the discharge valve 130 is opened, and air is discharged from the inside of the diaphragm chamber 160 to the discharge chamber 170. These operations are performed alternately and continuously, and the compressed air is continuously discharged. The basic operating principle itself including such a valve mechanism is a known technique.

The essential parts of the present invention are the specifications of the diaphragm and the center plate. The diaphragm used in the present invention is provided on a ring-shaped thin film portion having a circular opening at the center and on the outer periphery of the thin film portion. A fixing flange portion and a plurality of minute irregularities provided on at least one surface near the circular opening, and the center plate has minute irregularities corresponding to the minute irregularities on the opposing surface. The vicinity of the circular opening of the thin film portion is sandwiched by a disk-shaped center plate.

FIG. 4 is a perspective view showing an example of the diaphragm 40 used in the electromagnetic diaphragm pump 1 of the present invention, and FIG. 5 is a sectional view of the diaphragm 40 shown in FIG.
FIG. 6 is a cross-sectional view taken along line BB, and FIG. 6 is a plan view of the center plate used in the electromagnetic diaphragm pump 1 of the present invention in an exploded state, and a cross-sectional view taken along line BB and line CC.

4 to 6, a diaphragm 40 is shown.
Is a ring-shaped thin film portion 42 having a fixing flange portion 41 provided on the outer peripheral portion and a circular opening 43 in a central portion 45.
And The diaphragm 40 has a plurality of minute projections 46 forming minute irregularities on the peripheral edge near the circular opening 43. The minute projection 46 has a cylindrical shape in the illustrated example, a diameter of 1 to 3 mm, and a height of 0.5 to 3
mm. If the diameter of the minute projections 46 exceeds 3 mm, it is difficult to provide a large number of irregularities, and stress tends to be concentrated individually, which is not preferable. Such minute projections 46 are formed at equal intervals in a ring shape on the peripheral edge in the vicinity of the circular opening 43, but it is preferable that the number of formed is six or more. The number of the minute projections 46 formed is 5
If the number is less than or equal to the number,
Since the dispersion of the stress acting in the state of being pinched between 0 and 80 is insufficient, the center plate may be loosened due to deformation of the minute projections 46, which is not preferable. In addition, the minute projection 4
It is preferable to provide an interval of at least about 2 mm as an interval for forming 6. A plurality of (four in the illustrated example) positioning projections 41 a are provided on the outer surface of the flange portion 41, and a positioning projection 47 is provided on the inner surface of the circular opening 43. I have.

The diaphragm electromagnet-side center plate 70 mounted on the diaphragm 40 and the diaphragm valve case-side center mounted on the diaphragm 40 by sandwiching a portion (in the vicinity of the circular opening 43) formed with a plurality of minute projections and projections 46. The plate 80 has its facing surfaces 70A, 80
The outer peripheral portion of A is formed as gentle inclined portions 70a and 80a. The center plate 70 has an opposite surface 70A,
A plurality of minute concave portions 71 constituting minute irregularities are provided, and the minute concave portions 71 have a size and an array corresponding to the minute projections 46 of the diaphragm 40 described above. In the center of the center plates 70 and 80, a protrusion 72 for regulating the gap is provided.
The projection 72 is provided with the diaphragm 4.
A notch 77 corresponding to the projection 47 for positioning 0 is formed. The notch 77 is formed so that when the projection 72 of the center plate 70 is inserted into the circular opening 43 of the diaphragm 40 so as to engage with the projection 47, the minute projection 46 of the diaphragm 40 It is formed at a position where it engages with 71. At the center of the facing surface 80A of the center plate 80, a projection 82 for regulating the gap is provided. Further, on the upper surface of the gap regulating projection 72 of the center plate 70, a plurality of (six in the illustrated example, six bar-shaped projections) are protrudingly provided for positioning and engagement. A plurality of (six through-holes at equal intervals in the illustrated example) holes for positioning and engagement are formed on the upper surface of the convex portion 82 of the 80A, and each rod-shaped protrusion 73 and the through-hole 83 are They are arranged to face each other. The center plate 7
A hole 74 for inserting the connecting shaft 31 of the vibrator 30 and a groove 75 for engaging the end of the vibrator 30 are provided at the center of the non-opposing surface 70B. On the non-opposing surface 80B side of the center plate 80, the opening of each through-hole 83 has a tapered open shape, and the connecting shaft 31 of the vibrator 30 is inserted into the center of the non-opposing surface 80B. Hole 84 and a groove 85 for screw embedding.

FIG. 7 shows such a diaphragm electromagnet side center plate 70 and a diaphragm valve case side center plate 80 facing each other so as to sandwich the diaphragm 40, and the minute projections 46 of the diaphragm 40 are minutely formed on the center plate 70. FIG. 9 is a cross-sectional view showing a state in which the rod-shaped protrusion 73 is engaged with the concave portion 71 and pressed into contact with the rod-shaped protrusion 73 so as to be inserted into the through-hole portion 83. As shown in FIG. 7, the gap regulating projection 72 of the center plate 70 abuts the gap regulating projection 82 of the center plate 80, thereby compressing the thin film section 42 at a constant pressure. Pinch. The diaphragm 40 sandwiched and fixed by the center plates 70 and 80 in this manner allows the minute projections 46 of the center plate 70 to move even if the diaphragm 40 vibrates due to the reciprocating motion of the vibrator 30 and stress acts on the sandwiched portion. The engagement with the minute concave portion 71 disperses the above-mentioned stress, and the fixed position accuracy between the center plates 70 and 80 and the diaphragm 40 is maintained. The center plate 70 and the center plate 80 are sandwiched by the diaphragm 40 by melting and fixing the tip of the rod-shaped projection 73 inserted into the through-hole 83 within the tapered portion of the through-hole 83.
Can be fixed.

Next, another embodiment of the present invention will be described.

According to the present invention, a ring-shaped thin film portion having a circular opening in the center, a fixing flange provided on the outer peripheral portion of the thin film portion, and a bead portion provided on the peripheral edge of the circular opening are provided. Using a diaphragm having a plurality of fine irregularities on at least one upper surface of the bead portion, and having a ring-shaped groove portion corresponding to the shape of the bead portion on the opposing surface as a center plate, A bead portion is sandwiched by such a set of disk-shaped center plates using a device having minute irregularities corresponding to the minute irregularities.

FIG. 8 is a perspective view showing another example of the diaphragm 40 used in the electromagnetic diaphragm pump 1 according to the present invention, and FIG. 9 is a diagram showing the D- of the diaphragm 40 shown in FIG.
It is sectional drawing of the D line arrow. FIG. 10 is a plan view showing a state where a center plate of another example used for the electromagnetic diaphragm pump 1 of the present invention is disassembled, and sectional views taken along lines EE and FF.

8 to 10, the diaphragm 4
0 is a fixing flange portion 41 provided on the outer peripheral portion;
A ring-shaped thin film portion 4 having a circular opening 43 in a central portion 45
2 and a bead portion 4 provided on the periphery of the circular opening 43
And 4. Then, one upper surface 44 of the bead portion 44
a has a plurality of minute projections 46 constituting minute irregularities. The minute projection 46 has a cylindrical shape in the illustrated example,
The diameter can be set to about 1 to 3 mm and the height can be set to about 0.5 to 3 mm. If the diameter of the minute projections 46 exceeds 3 mm, it is difficult to provide a large number of irregularities, and stress tends to be concentrated individually, which is not preferable. Such a minute projection 46
Are formed at equal intervals on the upper surface of the bead portion 44,
It is preferable that the number of formed is 6 or more. Small protrusion 4
If the number of formed 6 is 5 or less, the dispersion of the stress acting in the state of being sandwiched between the center plates 70 and 80 is insufficient, and the center plate is loosened due to the deformation of the minute projections 46 as described later. Is not preferred. It is preferable that the interval between the minute projections 46 is set to at least about 2 mm. The thickness of the bead portion 44 is 3 to 1
It can be set to about 0 mm, and is preferably about 2 to 6 mm larger than the thickness of the thin film portion 42. Further, the width of the bead portion 44 can be set to about 1 to 5 mm. A plurality (four in the illustrated example) of positioning protrusions 41a is provided on the outer surface of the flange portion 41.
A convex portion 47 for positioning is provided on the inner surface of the bead portion 44.

A diaphragm electromagnet-side center plate 70 sandwiching the diaphragm 40 via a bead portion 44 having minute projections and depressions formed of a plurality of minute projections 46.
And the diaphragm valve case side center plate 80
Ring-shaped grooves 76 and 86 corresponding to the shape of the bead portion 44 are provided on the facing surfaces 70A and 80A. In the groove 76 of the center plate 70, a plurality of minute recesses 71 forming minute unevenness are provided. The minute recess 71 has a size corresponding to the minute projection 46 on the upper surface of the bead 43 of the diaphragm 40, It is an array.
A portion of the opposing surface 70A of the center plate 70 outside the ring-shaped groove portion 76 is a gentle slope portion 70.
a, a gap-shaped ring-shaped convex portion 72a is provided inside the ring-shaped groove portion 76, and a gap-regulated convex portion 72b is provided inside the convex portion 72a. The notch 77 corresponding to the positioning protrusion 47 of the diaphragm 40 is formed in the protrusion 72a. When the projection 72 a of the center plate 70 is inserted into the circular opening 43 of the diaphragm 40 so as to engage with the projection 47, the notch 77 causes the minute projection 46 of the diaphragm 40 to engage with the minute recess of the center plate 70. It is formed at a position where it engages with 71. The ring-shaped groove 86 on the facing surface 80A of the center plate 80
The outer portion is a gentle inclined portion 80a, and a convex portion 82a for regulating the gap is provided inside the ring-shaped groove portion 86. Further, on the upper surface of the ring-shaped convex portion 72a for regulating the gap on the opposing surface 70A of the center plate 70, a plurality of (six in the illustrated example, six rod-shaped projections at equal intervals) projections for positioning engagement are formed. And a peripheral portion 8 of the convex portion 82a on the facing surface 80A of the center plate 80.
A plurality of through holes 83 (six through holes at regular intervals in the illustrated example) for positioning and engagement are formed in 2b, and each rod-shaped projection 73 and the through hole 83 are arranged so as to face each other. I have. In the center of the non-opposing surface 70B of the center plate 70, a hole 74 for inserting the connecting shaft 31 of the vibrator 30 and a groove 75 for engaging an end of the vibrator 30 are provided. ing. Also, the center plate 80
On the non-opposing surface 80B side, the opening of each through-hole 83 has a tapered open shape, and a hole for inserting the connecting shaft 31 of the vibrator 30 into the center of the non-opposing surface 80B. 84 and a groove 85 for screw embedding are provided.

FIG. 11 shows such a center plate 70 on the electromagnet side of the diaphragm and a center plate 80 on the side of the diaphragm valve case so as to sandwich the diaphragm 40, and the minute projections 46 of the diaphragm 40 are FIG. 9 is a cross-sectional view showing a state in which the rod-shaped protrusion 73 is engaged with the concave portion 71 and pressed into contact with the rod-shaped protrusion 73 so as to be inserted into the through-hole portion 83. As shown in FIG. 11, the ring-shaped convex portion 72 a of the center plate 70 contacts the peripheral portion 82 b of the facing surface 80 A of the center plate 80, and the convex portion 72 b of the center plate 70 is Thus, the gap between the ring-shaped groove 76 and the groove 86 is constantly regulated. The bead portion 44 of the diaphragm 40 is held in a compressed state or a non-compressed state in the gap between the groove portion 76 and the groove portion 86.
Is not subject to compression. The diaphragm 40 sandwiched and fixed by the center plates 70 and 80 in this manner
Since the minute projections 46 on the upper surface of the bead portion 44 are engaged with the minute concave portions 71 in the groove portions 76 of the center plate 70, when the diaphragm 40 vibrates due to the reciprocating motion of the vibrator 30, the holding portion of the diaphragm 40 Is applied to the center plates 70, 8
The fixed positional accuracy between the zero and the diaphragm 40 is maintained. The center plate 70 and the center plate 80 are fixed in a state where the diaphragm 40 is sandwiched by melting and fixing the tip end of the bar-shaped projection 73 inserted into the through hole 83 to the tapered portion of the through hole 83. be able to.

In the present invention, the shape of the fine unevenness (fine unevenness) is not limited to the shape provided with the fine projections 46 and the minute concave portions 71 as described above. For example, the minute protrusion 46
May be any of a prismatic shape, a conical shape, a pyramid shape, and the like, and the minute concave portion 71 can be formed in a shape corresponding to the shape. Alternatively, convex portions and concave portions having a length of 0.5 to 3 mm may be alternately arranged to form a ring-shaped minute unevenness (small unevenness). Further, fine irregularities are formed on both surfaces near the circular opening of the diaphragm 40 and on both upper surfaces of the beads 44, and the opposing surfaces 70 of the pair of center plates 70 and 80 are formed.
Corresponding minute irregularities may be formed on both A and 80A.

[0042]

As described above, the diaphragm used in the present invention comprises a ring-shaped thin film portion having a circular opening in the center, a fixing flange provided on the outer periphery of the thin film portion, Using a center plate provided with a plurality of minute irregularities provided on at least one surface near the circular opening and having a minute irregularity corresponding to the minute irregularities on the opposing surface as a set of disc-shaped center plates, The vicinity of the circular opening is sandwiched by the set of disc-shaped center plates. Therefore, in the sandwiching portion of the diaphragm sandwiched by the set of disc-shaped center plates, the fine irregularities provided on the diaphragm are minute irregularities provided on the center plate. Are engaged with each other, and even if stress is applied to the holding portion by the vibration of the diaphragm due to the reciprocating motion of the vibrator, the engagement portion between the plurality of minute irregularities and the minute irregularities described above. In the disperse stress, a fixed positional accuracy between the diaphragm and the center plate is maintained, loosening the occurrence of center plate due to aging can be prevented even in long-time continuous operation. Further, in the present invention, the plurality of minute irregularities on the upper surface of the bead portion of the diaphragm engage with the minute irregularities in the ring-shaped groove portion of the center plate, and the diaphragm vibrates due to the reciprocating motion of the vibrator, thereby clamping and fixing the center plate. Even if stress acts on the bead portion, this stress is dispersed by the above minute unevenness, and the fixed position accuracy between the diaphragm and the center plate is maintained,
Even in a long-time continuous operation, the center plate is not loosened due to a change over time. Therefore, since the position accuracy of the vibrator with respect to the electromagnet is extremely high and stable, the durability of the electromagnetic diaphragm pump is greatly improved.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing a state in which an electromagnetic diaphragm pump of the present invention is disassembled into individual main parts.

FIG. 2 is a front view showing a necessary portion of a main part of the electromagnetic diaphragm pump of the present invention in a cross section.

FIG. 3 is a plan view showing a necessary portion of a main part of the electromagnetic diaphragm pump of the present invention in cross section.

FIG. 4 is a perspective view showing an example of a diaphragm used in the electromagnetic diaphragm pump of the present invention.

5 is a cross-sectional view of the diaphragm shown in FIG. 4 taken along line AA.

FIGS. 6A and 6B show a disassembled state of a center plate used in the electromagnetic diaphragm pump of the present invention, wherein FIG. 6A is a plan view, and FIG. 6B is a view taken along line BB and line CC of FIG. It is sectional drawing of a sight.

FIG. 7 is a cross-sectional view showing a state in which a pair of center plates shown in FIG. 6 are opposed to each other so as to sandwich a diaphragm.

FIG. 8 is a perspective view showing another example of the diaphragm used in the electromagnetic diaphragm pump of the present invention.

FIG. 9 is a sectional view of the diaphragm shown in FIG.

FIG. 10 shows a disassembled state of a center plate of another example used for the electromagnetic diaphragm pump of the present invention,
(A) is a plan view, and (B) is a cross-sectional view taken along line EE and line FF of (A).

FIG. 11 is a cross-sectional view showing a state in which a pair of center plates shown in FIG. 10 are opposed to each other so as to sandwich a diaphragm.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Electromagnetic diaphragm pump 10 ... Electromagnet case 21, 25 ... Electromagnet 30 ... Vibrator 40 ... Diaphragm 41 ... Flange for fixing 42 ... Thin film part 43 ... Circular opening 44 ... Bead part 46 ... Minute protrusion (fine irregularities) Reference numeral 50: valve case main body 60: valve case lid 70: diaphragm electromagnet side center plate 71: minute concave portion (fine irregularities) 72, 72a, 72b: gap regulating convex portion 76: ring-shaped groove portion 80: diaphragm valve case side Center plates 82, 82a Protrusions for regulating gaps 86 Ring-shaped grooves 100 Enclosure case 105 Air inlets 120 Inlet valves 130 Discharge valves 150 Inlet chambers 160 Diaphragm chambers 170 Discharge chambers

Claims (5)

[Claims] 1. An electromagnet case having a housing shape, a pair of electromagnets arranged to face each other in the electromagnet case, and interposed between opposing surfaces of the pair of electromagnets, with a change in polarity of the electromagnets, A vibrator reciprocating in a direction perpendicular to the opposing direction of the electromagnet, a pair of elastic diaphragms disposed to oppose both ends of the vibrator, a suction valve and a discharge valve separated by the diaphragm, and An electromagnetic diaphragm pump having a valve case body having a valve, wherein the diaphragm has a ring-shaped thin film portion having a circular opening in a central portion, and a fixing flange provided on an outer peripheral portion of the thin film portion. And a set of disc-shaped centers having a plurality of minute irregularities on at least one surface near the circular opening of the thin film portion and having minute irregularities corresponding to the minute irregularities on the opposing surface. Sandwiching the vicinity of the circular opening at a rate, the center plate is connected and fixed to an end portion of the vibrator,
An electromagnetic diaphragm pump, wherein a flange portion of the outer peripheral portion is fixed to the electromagnet case. 2. A casing-shaped electromagnet case, a pair of electromagnets arranged to face each other in the electromagnet case, and interposed between opposing surfaces of the pair of electromagnets, with a change in polarity of the electromagnets, A vibrator reciprocating in a direction perpendicular to the opposing direction of the electromagnet, a pair of elastic diaphragms disposed to oppose both ends of the vibrator, a suction valve and a discharge valve separated by the diaphragm, and An electromagnetic diaphragm pump having a valve case body having a valve, wherein the diaphragm has a ring-shaped thin film portion having a circular opening in a central portion, and a fixing flange provided on an outer peripheral portion of the thin film portion. And a bead portion provided at a peripheral edge of the circular opening, the bead portion having a plurality of minute irregularities on at least one upper surface, and a rib corresponding to the shape of the bead portion on an opposing surface. The bead portion is sandwiched between a pair of disk-shaped center plates having a groove-shaped groove portion and provided with minute irregularities corresponding to the minute irregularities in the groove portion, and the center plate is connected and fixed to an end of the vibrator. An electromagnetic diaphragm pump wherein the outer peripheral flange portion is fixed to the electromagnet case. 3. The electromagnetic diaphragm pump according to claim 1, wherein the fine irregularities of the diaphragm include at least six fine projections having a width of 3 mm or less. 4. The gap according to claim 1, wherein a protrusion for regulating a gap is provided on a surface of at least one of the pair of center plates facing the center plate. Electromagnetic diaphragm pump. 5. A pair of center plates having a bar-shaped projection for positioning and engagement on one opposing surface and a through hole for positioning and engagement on an opposing surface of the other center plate. Claims 1 to 4
An electromagnetic diaphragm pump according to any one of the above.