JPH10331771A - Electromagnetic pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic pump to easily and reliably couple a screw shaft to an end of a vibrator body. SOLUTION: A vibrator body 61 is made of a metal. An electromagnetic pump comprises provided at the end part of the body 61 with an approximate T-shaped screw shaft mounting groove 68 in which the head part 62a of a screw shaft 62 coupled to a diaphragm is fitted; a fixed protrusion part 75 protruded in the shaft mounting groove 68 through the groove edge on the deep side of the screw mounting groove 68 on which the end face of the head part 62a fronts; and a pressure recessed part 76 which is formed in a recess in the direction of the thickness of the vibrator body 61 in the vicinity of the groove edge on the deep side and from which the fixed protrusion part 75 is protruded. Simultaneously with formation of the pressure recessed part 76 in the vibrator body 61 by press working, the head part 62a fitted in the mounting groove is nipped between the protrusion part 75 and the step form groove edge 68b of the screw shaft mounting groove 68 by the fixed protrusion part 75 protruded in the groove 68, and the screw shaft 62 is coupled to the vibrator body 61.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art A vibrator reciprocally moved in an axial direction by supplying an alternating current to an alternating current electromagnet is provided. A screw shaft protruding from an end of the vibrator is connected to a diaphragm to reciprocate the vibrator. A diaphragm-type electromagnetic pump that sucks and discharges a fluid (gas or liquid) in a pump chamber partitioned on one side by the diaphragm by the amplitude operation of the diaphragm accompanying the diaphragm is widely known.

[0003] As an iron core of an AC electromagnet provided in this type of electromagnetic pump, an E-shaped laminated iron core having a central magnetic pole and side magnetic poles located on both sides thereof is generally used. The one having a pair of strip-shaped permanent magnets is used. And as a vibrator, FIG.
(A), (B) and FIG.
(A) and (B) are known.

A magnet cover type vibrator 1 shown in FIGS. 9A and 9B has a cover 2 made of a synthetic resin,
A pair of permanent magnets 3 (a rare earth magnet) is sandwiched between the two,
In addition, the screw shaft 5 is provided at both ends in the longitudinal direction with the adhesive agent 4 attached thereto, and the screw shaft 5 is provided at the both ends in the longitudinal direction.

A magnet-exposed vibrator 11 shown in FIGS. 10A and 10B has a pair of magnet mounting holes 12a provided in a vibrator main body 12 made of an aluminum alloy or a synthetic resin. 13 (ferrite magnet) and fit together with an adhesive (not shown).
The screw shafts 14 are respectively screwed into screw holes 12b formed at both ends in the longitudinal direction of the second screw 2 to protrude therefrom.

[0006]

The oscillator 1 shown in FIG.
The screw shaft 5 is sandwiched between the covers 2 and 2 so that it is difficult to hold the screw shaft 5 harder than the cover 2 with an appropriate strength due to the influence of the dimensional accuracy of the parts.
The cover 2 may be loosely mounted or the cover 2 may be damaged.

The screw shaft 14 of the vibrator 11 shown in FIG.
In order to screw in the vibrator main body 12, the screw hole 12b needs to be post-processed in the vibrator main body 12b, and it is necessary to screw the screw shaft 14 into the screw hole 12b one by one. That is, it takes time and effort to process and assemble the parts.

Accordingly, a first object of the present invention is to provide an electromagnetic pump that can easily and reliably connect a screw shaft to an end of a vibrator main body.

A second object of the present invention is to provide an electromagnetic pump capable of further improving the reliability of connection of a screw shaft to a vibrator body in solving the first problem. .

[0010]

According to a first aspect of the present invention, a vibrator main body is made of metal, and a screw shaft connected to a diaphragm at an end of the main body. A T-shaped screw shaft mounting groove into which the head of
A fixed protrusion protruding into the screw shaft mounting groove from a deep groove edge of the screw shaft mounting groove facing the end face of the head, and a concave portion provided in the thickness direction of the vibrator main body near the deep groove edge. A pressurized concave portion for pressing the fixed convex portion against the head portion, and clamping the head portion between the fixed convex portion and a step-shaped groove edge of the screw shaft mounting groove. Is connected to the vibrator main body. In the invention of claim 1, when the vibrator body having a predetermined shape is obtained by processing the metal material plate, the substantially T-shaped screw shaft mounting groove is also processed at the same time. Processing can be omitted. Then, in order to connect the screw shaft to the end of the vibrator main body, with the head of the screw shaft fitted in the screw shaft mounting groove of the vibrator main body, By pressing a portion near the edge from the thickness direction to provide a pressurized concave portion, a fixed convex portion projecting into the screw shaft mounting groove is formed at the deep groove edge, or a fixed convex portion already existing at the deep groove edge. May be further protruded into the screw shaft mounting groove. As a result, the head of the screw shaft is strongly sandwiched between the fixed projection and the step-shaped groove edge of the screw shaft mounting groove, and the screw shaft is connected to the end of the vibrator main body. According to such a connection structure,
The trouble of screwing the screw shaft is unnecessary, and by controlling the amount of protrusion of the fixed protrusion to a large extent, the effect of component precision can be reduced and the pinching of the head of the screw shaft can be realized with certainty. Since both the vibrator main body and the screw shaft are made of metal, there is no possibility that the vibrator main body is damaged due to the connection.

In order to solve the second problem, the invention according to claim 2 dependent on claim 1 has a head groove in which the head of the screw shaft extends in a direction intersecting the vibration direction of the vibrator. The screw shaft is connected to the vibrator main body by inserting a fixed protrusion into the groove.

In the invention of claim 2, claim 1
Therefore, the following operation is provided in addition to the operation of the first invention. That is, a part of the fixed convex portion enters the head groove of the screw shaft, and the head of the screw shaft is sandwiched between the convex portion and the step-shaped groove edge of the screw shaft mounting groove. Since the screw shaft is connected to the screw shaft, the fixed protrusion can be used as a detent in the direction around the screw shaft. Thus, when the nut is screwed into the screw shaft and the diaphragm is connected to the screw shaft, it is possible to prevent the screw shaft from rotating regardless of the tightening of the nut.

[0013]

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

In FIGS. 1 and 2, reference numeral 21 denotes a main body case.
This is formed by connecting the main case 22 and the pair of sub-cases 23a and 23b. The main case 22 includes a pair of case members 22.
a and 22b are connected.

A peripheral portion of the diaphragm 24 is sandwiched between one case member 22a and one sub case 23a connected to the case member 22a. Similarly, a peripheral portion of the diaphragm 25 is sandwiched between the other case member 22b and the other sub case 23b connected thereto. Each of the diaphragms 24 and 25 has center plates 26 and 27 for sandwiching the central portion from both sides.

The inside of the main body case 21 is controlled by the two diaphragms 24 and 25 to form an electromagnet accommodating chamber 28 between the two diaphragms 24 and 25, a first pump chamber 29 between one of the diaphragms 24 and one of the sub-cases 23a, and the other. Pump chamber 3 between the diaphragm 25 of FIG.
It is divided into three rooms, 0. As shown in FIG. 2, a pulsation absorbing tank chamber 31 partitioned from the electromagnet housing chamber 28 by a part of the case members 22a and 22b is formed below the electromagnet housing chamber 28. A discharge port 32 is provided on the wall surface of 31. In addition, 3 in FIG.
Reference numeral 1a denotes a baffle provided in the tank chamber 31. A part of the air to be discharged can flow toward the discharge port 32 bypassing the baffle 31a.

As shown in FIG. 2, a sub-case 23a on the first pump chamber 29 side has a first cover 34 forming an intake chamber 33 as a suction chamber between the sub-case 23a and the outer surface thereof. Exhaust chamber 35 as a discharge chamber between
And the second cover 36 which forms the respective components.
The intake chamber 33 has an intake port 33 a communicating with the outside of the pump, and an exhaust port 35 a of the exhaust chamber 35 communicates with the tank chamber 31.

These two chambers 33, 35 and the first pump chamber 29
The sub-case 23a that separates the
An intake valve 37 for opening and closing between the first pump chamber 29 and the exhaust valve 3 for opening and closing between the exhaust chamber 35 and the first pump chamber 29
8 are attached. The intake valve 37 opens only when air flows from the intake chamber 33 into the first pump chamber 29,
Otherwise, the closed state is maintained. Similarly, the exhaust valve 38
It is opened only when air flows into the exhaust chamber 35 from the pump chamber 29, and is otherwise closed.

A first cover 40 forming an intake chamber 39 as a suction chamber between the sub case 23b on the second pump chamber 30 side and an outer surface thereof, and a discharge chamber between the sub case 23b and the outer surface of the sub case 23b. And a second cover 42 that forms the exhaust chamber 41 of each of them. The intake chamber 39 has an intake port 39 a communicating with the outside of the pump, and an exhaust port 41 a of the exhaust chamber 41 communicates with the tank chamber 31.

The two chambers 39 and 41 and the second pump chamber 30
The sub-case 23b that separates the intake chamber 39
An intake valve 42 for opening and closing between the pump chamber 30 and the second pump chamber 30, and an exhaust valve 4 for opening and closing between the exhaust chamber 41 and the second pump chamber 30
3 are attached. The intake valve 42 opens only when air flows into the second pump chamber 30 from the intake chamber 39,
Otherwise, the closed state is maintained. Similarly, the exhaust valve 42 is
It is opened only when air flows into the exhaust chamber 41 from the pump chamber 30, and is kept closed otherwise.

As shown in FIGS. 1 and 2, the electromagnet accommodating chamber 28 reciprocates in the axial direction with the pair of AC electromagnets 45 and the diaphragms 24 and 25 in accordance with the excitation of these electromagnets 45. 1 and 2 are accommodated.

The electromagnet 45 is provided with a coil bobbin 54 on an E-shaped core 53 having a laminated structure having a central magnetic pole 51 and a pair of side magnetic poles 52 located on both sides of the magnetic pole 51.
Are formed in combination with the drive coil 55 via the.
The drive coil 55 is wound around the coil bobbin 54, and the coil bobbin 54
Mounted on

As shown in FIG. 1, the tips of the magnetic poles 51 and 52 which are parallel to each other are formed by crushing and projecting toward the groove between the central magnetic pole 51 and the side magnetic pole 52. Pole end surfaces 51a and 52a. These magnetic pole tip surfaces 51a and 52a extend in the vertical direction as shown by a two-dot chain line in FIG. The magnetic attraction / repulsion between them can be performed more effectively. Further, the protruding portion of the pole tip surface 51 of the central magnetic pole 51 is a coil bobbin 5
4 is used as a stopper to hold the bobbin 5
4 is prevented from slipping out of the central magnetic pole 51.

The pair of electromagnets 45 having the above-described configuration are housed in the electromagnet housing chamber 28 such that the magnetic pole end faces 51a and the magnetic pole end faces 52a face each other.
These electromagnets 45 are fixed by lightly press-fitting between the side walls 22a1 and 22b1 of the case members 22a and 22b, respectively, and the respective side walls 22a1 and 22b1 and the side magnetic poles 52 are fitted in a concave and convex manner (see FIG. 1). They are positioned relative to each other by making the concave / convex fitting portion 56).

The vibrator 46 is disposed between the pair of electromagnets 45, and includes a vibrator main body 61 made of a non-magnetic metal material and a pair of screw shafts, as shown in FIGS. 62 and a pair of permanent magnets 63.

The vibrator main body 61 is formed by connecting two main body plates 64 and 65 having a substantially rectangular shape and substantially the same size. The two main body plates 64 and 65 are punched from a metal plate made of a brass plate or the like, which is a non-magnetic material, by, for example, press working in order to increase the amplitude of the vibrator 46 and improve the pump performance. The plate thickness (about 1 mm) is smaller than the thickness of the permanent magnet 63. As shown in FIGS. 3 and 4, the plates 64 and 65 have a plurality of connection protrusions 66 integrally protruding from one main body plate 64 and the other main body plate 6
5 is provided with a plurality of connection holes 67 corresponding to the respective connection protrusions 66. The vibrator main body 61 is formed by overlapping the two main body plates 64 and 65 and connecting them while press-fitting the respective connection protrusions 66 into the connection holes 67.

Each of the main body plates 64 and 65 has a substantially T-shaped groove 68a at the center of both ends in the longitudinal direction, and these grooves 68a are combined by the assembly of the vibrator main body 61 to form the screw shaft mounting groove 68. Has formed. The grooves 68a are formed by simultaneously punching the main plates 64 and 65 in a press working for punching the metal plates from a metal material plate. As shown in FIGS. 4 and 5 (A), a fixing convex portion 75 is provided on the inner edge of the screw shaft mounting groove 68 so as to protrude into the screw shaft mounting groove 68.

Screw shafts 62 are respectively mounted in screw shaft mounting grooves 68 at both ends in the longitudinal direction of the vibrator main body 61.
As shown in FIGS. 4 and 5, a screw having a square head 62 a is used for the screw shaft 62. These screw shafts 62 are fixed to the vibrator main body 61 by fitting their heads 62 a into the screw shaft mounting grooves 68 so that the screw shafts protrude from the end faces of the vibrator main body 61. The head portion 62a of the screw shaft 62 is formed to be slightly smaller than a groove portion other than the inlet portion of the screw shaft mounting groove 68, and its width B is the maximum width of the vibrator main body 61 (reference numeral C in FIG. 3). ) Is formed narrower.

These screw shafts 62 are connected to the ends of the vibrator main body 61 in the following procedure. The heads 62a of the screw shafts 62 are fitted into the two screw shaft mounting grooves 68 of the vibrator main body 61, respectively. This fitting state is shown in FIG. or,
The mutual positions of the vibrator main body 61 and the screw shaft 62 in this fitted state are maintained by a dedicated jig (not shown). Next, the vibrator main body 61 to which the screw shaft 62 is fitted is set on a press machine (not shown), and press working is performed by the press machine, and a portion of the vibrator main body 61 near the fixed convex portion 75 is Pressing is performed from one side or both sides in the thickness direction with a punch-like driving die of the press machine. This pressing is performed simultaneously on the pair of screw shafts 62, but may be performed individually. As shown in FIG. 5 (B), a pressing concave portion 76 is formed near the fixing convex portion 75 by such pressing, and as the material is pushed away by the concave portion 76 to the periphery, as shown in FIG. A)
The fixing projection 75 is further pushed into the screw shaft mounting groove 68 as shown by the two-dot chain line. As a result, FIG.
As shown in (B), since the fixed protrusion 75 is pressed against the head 62a of the screw shaft 62, the fixed protrusion 75 and the step-shaped groove edge 68b of the screw shaft mounting groove 68 (see FIG. 5). The head 62 a is interposed between the heads 62 a, so that the screw shaft 62 is connected to the vibrator main body 61.

The vibrator main body 61 has a pair of magnet mounting holes 69 parallel to each other. These mounting holes 69
May be provided in a direction that intersects at right angles to the center line A of the vibrator 61, in other words, the direction of the amplitude of the vibrator 46, which will be described later, connecting the axes of the two screw shafts 52. In the first embodiment, in order to smooth the amplitude operation of the vibrator and reduce noise during use, the vibrator is provided in a direction obliquely intersecting the center line A. The center line A is shown in FIG. 2, and θ in FIG. 2 indicates the skew angle of the magnet mounting hole 69 with respect to the center line A.

The magnet mounting holes 69 are provided in the two main body plates 6.
The rectangular openings 69a opened in the holes 4 and 65 are formed by fitting the vibrator main body 61 by the assembling. On the opening edge along the longitudinal direction of the magnet mounting hole 69,
The permanent magnet 63 protrudes outward in the thickness direction of the vibrator main body 61.
Each of the flanges 69b for ensuring a large supporting area is bent.

The permanent magnets 63 have a rectangular shape, are fitted in the magnet mounting holes 69, and are fixed to each other with an anaerobic adhesive (not shown) or the like. Therefore, the pair of permanent magnets 63 are also provided so as to be inclined parallel to each other with a skew angle θ with respect to the center line A of the vibrator main body 61.
As shown in FIG. 3, the permanent magnet 63 is mounted such that the pole faces on both sides in the thickness direction are equal to or less than the protruding height of the flange 69b. In the case of the first embodiment, the strength is brittle. In order to prevent the permanent magnet 63 from being damaged, the leading edge of the flange 69b is slightly protruded from the magnetic pole surface so that the edge of the permanent magnet 63 does not hit anything.

The permanent magnet 63 has a large energy product in order to reduce the width of the permanent magnet 63 and, consequently, the size of the vibrator 46 and to reduce the size of the electromagnet 45.
Therefore, a rare earth magnet material having high magnetic properties, for example, a samarium / cobalt magnet material is used, but a similar neodymium / iron / boron magnet material may be used. The permanent magnet 63 is magnetized in its thickness direction. One surface has an N pole and the other surface has an S pole. The two permanent magnets 63 are fixed to the vibrator main body 61 such that one surface of the one electromagnet 45 has different polarities and the other surfaces of the other electromagnet 45 have different polarities. I have.

The vibrator 46 having the above-described configuration is disposed between a pair of AC electromagnets 45 as shown in FIG. 1, and screw shafts 62 protruding from both ends thereof are connected to a pair of left and right diaphragms 24 and 25, respectively. Have been. This connection is made by screw shaft 6
2 is the center frame 26 of the diaphragms 24 and 25,
27 and a washer 70 at the penetrating end.
Are fitted, and then the nut 71 is screwed and tightened. FIG. 2 shows the relationship between the permanent magnet 63 of the vibrator 46 supported across the left and right diaphragms 24 and 25 and the magnetic pole end surfaces 51a and 52a of the electromagnet 45 in this manner. That is, since the permanent magnet 63 is inclined as described above, the magnet end faces 51a, 52
is inclined in the vibration direction of the vibrator 46 with the skew angle θ with respect to the magnetic pole ends 51a, 52a.
a.

The diaphragm type electromagnetic pump having the above-described structure is
It is used by applying an alternating current to each of the drive coils 55 of the pair of alternating current electromagnets 45 by a half cycle. As a result, the central magnetic poles 51 having a positional relationship facing each other with the vibrator 46 therebetween have different polarities, and the side magnetic poles 52 having the same positional relationship are excited so as to have different polarities. And these magnetic poles 51, 5
The polarity of the two switches every half cycle of the alternating current.

Therefore, one permanent magnet 63 of the vibrator 46 is magnetically attracted to, for example, the magnetic pole end surface 51 a of the central magnetic pole 51 by the excitation of the electromagnet 45 during the half cycle of the supplied alternating current. With one side magnetic pole 52
Magnetically repels with the magnetic pole tip surface 52a, and at the same time, the other permanent magnet 63 magnetically attracts with the magnetic pole tip surface 51a, and simultaneously with the magnetic pole tip surface 52a of the other side magnetic pole 52. The vibrator 46 is moved to the right in FIG. 1. Then, by the excitation during the next half cycle of alternating current, the one permanent magnet 63 of the vibrator 46 magnetically repels with the magnetic pole end face 51a and the magnetic pole end face 52a of the one side magnetic pole 52. And the other permanent magnet 63 simultaneously attracts magnetically between the magnetic pole end face 51a and the magnetic pole between the magnetic pole end face 52a of the other side magnetic pole 52. Magnetically repel each other,
The vibrator 46 is moved leftward in FIG.

The vibrator 46 is reciprocated with the diaphragms 24 and 25 in the axial direction by such magnetic action, that is, vibrated in the left and right directions in FIGS. 1 and 2, and accordingly, the pump operates. It is.

In this pump operation, when the vibrator 46 is moved rightward, the volume of the first pump chamber 29 increases, so that the exhaust valve 38 is closed and the intake valve 37 is opened, and the intake chamber 33 is opened. Then, air is sucked into the first pump chamber 29. Then, when the vibrator 46 is moved to the left next time, the volume of the first pump chamber 29 becomes small, so that the intake valve 37 is closed and the exhaust valve 38 is opened, so that the exhaust gas is exhausted from the first pump chamber 29. Air is pumped into the chamber 35, and this air is discharged via the tank chamber 31 to the discharge port 3.
2 to the outside. Similarly, when the vibrator 46 is moved to the right as described above, the volume of the second pump chamber 30 is reduced, so that the exhaust valve 43 is opened and the intake valve 42 is closed, and the second pump chamber 30 is closed. Air is pressure-fed from 30 to the exhaust chamber 41, and this air is discharged to the outside from the discharge port 32 via the tank chamber 31. When the vibrator 46 is moved to the left as described above, the volume of the second pump chamber 30 increases, so that the intake valve 42 is opened and the exhaust valve 53 is closed, and the intake chamber 39 is closed.
Then, air is sucked into the second pump chamber 30.

By repeating such a pump operation,
This electromagnetic pump can compress and discharge air twice per reciprocation of the vibrator 46. The discharged air is used as a medium for inflating the air bag provided in an air massage machine that performs massage by inflating and deflating the air bag, for example.

In assembling the vibrator 46 of the electromagnetic pump having the above-described structure, to connect the screw shaft 62 to the end of the vibrator main body 61, the head 62a of the screw shaft 62 is connected to the vibrator main body 61 as described above. In the state of being fitted in the screw shaft mounting groove 68 of
By forming a pressurized concave portion 76 by pressing in the thickness direction in a portion near the deep groove edge of the screw shaft mounting groove 68 of the vibrator main body 61, a fixed convex portion 75 previously provided on the deep groove edge is formed. Should be further projected into the screw shaft mounting groove 68. Thereby, the head 6 of the screw shaft 62 is located between the fixed convex portion 75 and the step-shaped groove edge 68b of the screw shaft mounting groove 68.
The screw shaft 62 can be connected to the end of the vibrator main body 61 by strongly sandwiching 2a.

According to such a connection structure, the trouble of screwing the screw shaft 62 into the vibrator main body 61 is not required, and
Main body plate 6 forming vibrator main body 61 from brass plate
When punching out the 4, 65, the substantially T-shaped groove 68a forming the substantially T-shaped screw shaft mounting groove 68 can be simultaneously processed, whereby the vibrator main body 61 can be post-processed. Can be omitted. In addition, the pair of screw shafts 62 can be simultaneously attached and fixed to the vibrator main body 61 as described above. Therefore, the oscillator 46 can be obtained at low cost.

By controlling the amount of protrusion of the fixed projection 75 to a large extent when attaching the screw shaft 62, the influence of the precision of components such as the screw shaft 62 can be reduced.
Is held in an appropriate posture, and the head 62a can be reliably and firmly sandwiched between the fixed convex portion 75 and the step-shaped groove edge 68b. Moreover, since both the vibrator main body 61 and the screw shaft 62 are made of metal, there is no possibility that the vibrator main body 61 is damaged due to the connection by the sandwiching.

The electromagnetic pump having the above configuration has the following advantages based on the vibrator 46. The vibrator 46 is
Since the magnetic pole surface of the permanent magnet 63 is exposed to the outside and is of a magnet exposed type which faces the magnetic pole end surfaces 51a and 52a of the AC electromagnet 45, the magnetic pole surface of the permanent magnet 63 and the magnetic pole end surface 5
1a, 52a, there is no member for attenuating magnetic flux in the gap, and the gap g
(See FIG. 1). Therefore, the magnetic attraction and repulsion between the electromagnet 45 and the permanent magnet 63 of the vibrator 46 can be enhanced, and the pump performance can be improved. or,
The vibrator main body 61 of the vibrator 46 is
Since the main body plates 64 and 65 are formed by overlapping the main body plates 64 and 65, a thin brass plate can be employed. Therefore, the formation of the opening 69a forming the magnet mounting hole 69 with respect to the main body plates 64 and 65 can be performed by easy press working. Therefore, the processing cost can be reduced and the vibrator 46 can be obtained at a low cost, so that the cost of the entire pump can be reduced.

FIGS. 7 and 8 show a second embodiment of the present invention. This embodiment is basically similar to the first embodiment.
Since the configuration is the same as that of the first embodiment, the same components as those of the first embodiment are denoted by the same reference numerals, and when the description of the configuration and operation is omitted, different portions will be described below. The difference between the second embodiment and the first embodiment is the configuration of the head of the screw shaft, and the other points are the same as those of the first embodiment including portions not shown in FIGS. 7 and 8. The configuration is the same as that of the embodiment.

In the second embodiment, the screw shaft 6
8, the head 62a has a head groove 62b extending in a direction intersecting the vibration direction of the vibrator 46, for example, in the width direction or the thickness direction of the vibrator 61 (FIG. 8). reference). Then, in this head groove 62b, FIG.
As shown in (B), the pressurized recess 6 is applied to the vibrator main body 61.
By forming the fixing protrusions 5, the fixed protrusions 75 that are further protruded are formed.
The recessed portion forms a concave-convex engagement between the head portion 62a and the fixed convex portion 75, and the screw shaft 6
2 is connected to the screw shaft mounting groove 68 of the vibrator main body 61.

Therefore, the second embodiment has the following operation in addition to the operation described in the first embodiment. That is, a part of the fixed convex portion 75 is
The protrusion 75 and the step-shaped groove edge 68 of the screw shaft mounting groove 68 are inserted into the head groove 62b and engaged with the concave and convex.
b, the head 62a of the screw shaft 62 is sandwiched between the screw main body 61 and the screw shaft 62 is connected to the vibrator main body 61.
Can be used as a detent in the direction around the axis of the screw shaft 62.

Accordingly, when the nut 71 is screwed into the screw shaft 62 and the diaphragm 24 or 25 is connected to the screw shaft 62, the screw shaft 62 is tightened with the nut 71.
Is prevented from rotating, so that the screw shaft 62 is provided in an appropriate posture, and the head 62a can be prevented from interfering with the electromagnet 45.

The present invention is not limited to the above embodiments. For example, in the above-described embodiments, the fixed convex portion 75 is provided in advance at the edge of the deep groove of the screw shaft mounting groove 68. Instead, the fixed convex portion 75 is formed so as to protrude with the formation of the pressing concave portion 76. Is also good. Further, the vibrator body used in the present invention may have a single-plate structure made of a single metal plate. Further, since the embodiment has a pair of AC electromagnets, it is excellent in that the force for vibrating the vibrator is large, but the present invention can also be applied to an electromagnetic pump having one AC electromagnet. .

[0049]

The present invention is embodied in the form described above and has the following effects.

According to the first aspect of the present invention, it is possible to omit the screw hole processing for the vibrator main body and to strongly fix the head of the screw shaft between the fixed convex portion and the stepped groove edge of the screw shaft mounting groove. Since the pin is pinched and the screw shaft is connected to the end of the vibrator body, the trouble of screwing the screw shaft can be eliminated, and therefore,
The connection of the screw shaft to the end of the vibrator body can be facilitated. In addition, the influence of component accuracy on the connection of the screw shaft to the vibrator main body is small, and since the vibrator main body and the screw shaft are both metal, there is no possibility that the vibrator main body may be damaged by the connection. The screw shaft can be reliably connected to the end of the vibrator body.

According to the second aspect of the invention, which is dependent on the first aspect of the invention, in addition to the effect of the first aspect of the invention, the screw shaft has a fixed convex portion which fits into the head groove of the screw shaft. Since the risk of rotation of the screw shaft when connecting the diaphragms can be prevented, the reliability of connection of the screw shaft to the vibrator body can be further improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional plan view showing a configuration of an electromagnetic pump according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the electromagnetic pump shown along the line ZZ in FIG.

FIG. 3 is a sectional view showing a configuration of a vibrator included in the electromagnetic pump shown in FIG. 1;

FIG. 4 is an exemplary exploded perspective view showing the configuration of the vibrator shown in FIG. 3;

5A is a plan view showing a state immediately before the vibrator main body of the vibrator in FIG. 3 and a screw shaft fitted thereto are connected to each other. FIG. 5B is a cross-sectional view showing a state in which the vibrator main body and the screw shaft of the vibrator in FIG. 3 are connected along line YY in FIG.

FIG. 6 is an exploded perspective view showing a configuration of a vibrator of an electromagnetic pump according to a second embodiment of the present invention.

FIG. 7 is a perspective view showing a screw shaft provided in a vibrator of an electromagnetic pump according to a second embodiment.

FIG. 8A is a plan view showing a state immediately before a vibrator main body of a vibrator of an electromagnetic pump according to a second embodiment and a screw shaft fitted thereto are connected. FIG. 8B is a cross-sectional view showing a state where the vibrator main body and the screw shaft of the vibrator of the electromagnetic pump according to the second embodiment are connected to each other along the line XX in FIG.

FIG. 9A is a front view showing a configuration of a vibrator provided in an electromagnetic pump according to a conventional example. FIG. 10B is a cross-sectional view taken along line WW in FIG. 9A.

FIG. 10A is a front view showing a configuration of a vibrator included in an electromagnetic pump according to another conventional example. FIG. 11B is a side view of the electromagnetic pump shown in FIG.

[Explanation of symbols]

 Reference numeral 21: body case, 24: diaphragm, 25: diaphragm, 29: pump room, 30: pump room, 45: AC electromagnet, 46: vibrator, 51: central magnetic pole, 51a: magnetic pole end surface of central magnetic pole, 52: side magnetic pole 52a: magnetic pole end surface of side magnetic pole, 53: E-shaped iron core, 54: coil bobbin, 55: drive coil, 61: vibrator body, 62: screw shaft, 62a: head of screw shaft, 62b: head groove, 63 ... permanent magnet, 68 ... screw shaft mounting groove, 68b ... stepped groove edge, 75 ... fixed convex part, 76 ... pressurized concave part.

Claims (2)

[Claims] 1. A main body case having a pump chamber partitioned on one side by a diaphragm, an AC electromagnet having a drive coil mounted on an iron core, a permanent magnet mounted on a vibrator main body, and an end of the vibrator main body. A vibrator disposed opposite the magnetic pole end surface of the iron core, and supplying alternating current to the drive coil to move the vibrator in its axial direction. An electromagnetic pump that vibrates the diaphragm and oscillates the diaphragm to suction and discharge a fluid in the pump chamber, wherein the vibrator body is made of metal, and a head of the screw shaft is provided at an end thereof. A T-shaped screw shaft mounting groove into which
A fixed protrusion protruding into the screw shaft mounting groove from a deep groove edge of the screw shaft mounting groove facing the end face of the head, and a concave portion provided in the thickness direction of the vibrator main body near the deep groove edge. A pressurized concave portion for pressing the fixed convex portion against the head portion, wherein the head portion is sandwiched between the fixed convex portion and a step-shaped groove edge of the screw shaft mounting groove, and the screw shaft is Is connected to the vibrator main body. 2. A head groove of a screw shaft having a head groove extending in a direction intersecting with a vibration direction of the vibrator. The fixed convex portion is inserted into the groove to move the screw shaft to the vibration. 2. The electromagnetic pump according to claim 1, wherein the electromagnetic pump is connected to a slave main body.