KR20130064020A - Electromagnetic diaphragm pump - Google Patents

Abstract

PURPOSE: An electronic diaphragm pump is provided to maintain the discharging amount and prevent water leakage even by use for a long time by firmly maintaining the circumferential edge of the diaphragm. CONSTITUTION: An electromagnet diaphragm pump(1) comprises an electromagnet(20); a vibrator(3) vibrating according to the polarity of the electromagnet; a diaphragm(40) arranged on the end of the vibrator; a first gripping member(50); and a second gripping member(60). The diaphragm has a ring-shaped bead part(45) protruded from the outer circumference of the diaphragm in a vertical direction to a first membrane surface. The first gripping part has a recessed part to receive the bead part. The second gripping part has a pressed surface to press a second membrane surface of the diaphragm without the bead part. The pressing surface of the second gripping part comprises a first convex pressing part and a second concave pressing part.

Description

ELECTROMAGNETIC DIAPHRAGM PUMP

The present invention relates to, for example, an electronic diaphragm pump for a domestic fuel cell, an electronic diaphragm pump for pumping fuel gas such as LPG or air as a fluid, and in particular, the discharge amount does not change even when used for a long time, and the diaphragm is maintained. The present invention relates to an electronic diaphragm pump in which there is no fear that the part that is present will collide with another part.

Background Art Conventionally, an electromagnetic diaphragm pump that vibrates a vibrator by an electromagnet to displace the diaphragm and sucks and discharges (discharges) a fluid is known.

In such an electronic diaphragm pump, the diaphragm is normally attached to the pump main body in the state which pulled the bead (fixed protrusion) formed in the outer peripheral part to the outer peripheral direction.

However, if it is driven for a long time, the diaphragm may be attracted to the center portion which is the pivot center, and loosening may occur gradually from the outer peripheral portion of the diaphragm. In this way, when looseness arises from the outer peripheral part of a diaphragm, the magnitude | size of the original diaphragm cannot be obtained, and there exists a possibility that a problem may arise, such as discharge flow rate falling, or the part holding the diaphragm collides with another part.

To solve such a problem, a technique is disclosed in which a rib is provided in a holding portion for holding a diaphragm, the diaphragm is more strongly inserted by the rib, and a countermeasure for loosening of the diaphragm is taken. For example, JP-A-2006-112368 discloses a pulsating diaphragm fuel pump that uses a simple configuration to reduce manufacturing costs while avoiding displacement or looseness of the built-in diaphragm, thereby ensuring airtightness. In addition, in the overlapping portion of the pump main body and the diaphragm cover, for the purpose of maintaining proper tension of the diaphragm, the engagement recesses provided in an annular shape on one end face and protruding in an annular shape on the other end face are provided. Therefore, there has been proposed a fastening structure consisting of a fastening convex portion in which a fastening recess and a cross-sectional shape are substantially coincident with the diaphragm. In addition, the diaphragm has a flat plate shape having no beads, and when the pump body and the diaphragm cover are joined, the diaphragm is inserted into the circumferential edge of the diaphragm to extend the diaphragm in the centrifugal direction to impart a predetermined tension. A proposal of a fastening structure made by fixing is made.

However, the double anti-shift ribs disclosed in the above-mentioned JP Published Patent Application No. 2006-112368 are all curved in cross section. Therefore, it can be said that it is difficult to keep the circumferential edge of the diaphragm firmly and prevent the shift by the rib only. In order to assist such a lack of holding force, Patent Document 1 fixes the diaphragm in a bent state at almost two angles at two places by the engagement structure at the end of engagement of the engagement convex portion and engagement concave portion. It is possible to maintain a good tension without causing misalignment or rattling even when used for a long period of time. However, there may arise a problem that stress concentration tends to occur at a portion that is bent almost at right angles on the inner surface side, and breakage of the diaphragm tends to occur at this portion.

Under the circumstances, the present invention has been invented, and an object thereof is an electronic diaphragm pump using a diaphragm having a bead, which can more firmly hold the outer periphery of the diaphragm and prevent looseness from occurring at the outer periphery of the diaphragm. It is an object of the present invention to provide an electronic diaphragm pump in which the discharge amount does not change even when used for a long time, the leakage preventing effect is improved, and the parts holding the diaphragm do not collide with other parts. In addition, the above-mentioned prior art document 1 targets the flat diaphragm which does not have a bead, and is a pulsation diaphragm pump different from the electronic pump which this application aims at.

In order to solve such a problem, the electromagnetic diaphragm pump of the present invention is an electromagnet, a vibrator vibrating in response to a change in polarity of the electromagnet, a diaphragm disposed at an end of the vibrator, and a first clamping device for pinching and fixing the circumferential edge of the diaphragm. And a second holding member, wherein the diaphragm has a ring-shaped bead projecting in a direction perpendicular to the first membrane surface at the circumferential portion thereof, and the first holding member has a recess for accommodating the bead portion. And the second holding member has a pressing surface for pressing the second membrane surface of the diaphragm in which the bead portion is not formed, and the pressing surface of the second holding member has a first pressing convex portion having a curved portion in cross section; And a second pressing convex portion having a cross-sectional shape having an acute-shaped projection, wherein the first pressing convex portion is the second It is arrange | positioned inside a press convex part, and a 1st press convex part is formed in the positional relationship completely contained in the area occupied by the base part of the said bead part, or is formed in the positional relationship which overlaps with a part of the area, Or in a positional relationship completely including an area occupied by the base of the bead portion.

Moreover, as a preferable aspect of the electronic diaphragm pump of this invention, the said 2nd press convex part is formed so that the diaphragm of the outer side outside the area occupied by the base of the said bead part may be pressed.

Moreover, as a preferable aspect of the electronic diaphragm pump of this invention, when the width | variety of the said 1st press convex part is made into W1, and the width | variety of the area occupied by the base of the said bead part is set to Wb, it is comprised so that W1 / Wb may be 0.4-1.0. do.

Moreover, as a preferable aspect of the electronic diaphragm pump of this invention, the thickness of the said bead part itself is Tb, the thickness of the outer diaphragm part Th, the height of the said 1st press convex part is H1, and the height of the said 2nd press convex part is H2. In one case, H1 / (Tb + Th) = 0.05 to 0.12, and H2 / Th = 0.1 to 0.3.

Moreover, as a preferable aspect of the electronic diaphragm pump of this invention, when the width | variety of the said 1st press convex part is set to W1, height is H1, and the width | variety of the said 2nd press convex part is set to W2 and height is set to H2, H1 / W1 = 0.2 to 0.5, and H2 / W2 = 0.5 to 2.0.

Moreover, as a preferable aspect of the electronic diaphragm pump of this invention, the said 1st press convex part and the said 2nd press convex part are arrange | positioned at the press surface of the said 2nd clamping member in ring shape.

Moreover, as a preferable aspect of the electronic diaphragm pump of this invention, the said 1st press convex part and the said 2nd press convex part are arrange | positioned so that it may become concentric with the press surface of the said 2nd clamping member.

Moreover, as a preferable aspect of the electronic diaphragm pump of this invention, the said diaphragm is provided with the ring-shaped bead part which protruded inward in the peripheral part part, and the said 1st clamping member is a diaphragm stand located inside the diaphragm. The second clamping member is configured to be a diaphragm holding part located outside the diaphragm.

Moreover, as a preferable aspect of the electronic diaphragm pump of this invention, the said diaphragm is provided with the ring-shaped bead part which protruded outward in the peripheral part part, and the said 1st clamping member is a diaphragm holding part located in the outer side of a diaphragm. The second clamping member is configured to be a diaphragm stand positioned inside the diaphragm.

Moreover, as a preferable aspect of the electronic diaphragm pump of this invention, the said diaphragm holding part functions as a valve case main body provided with a valve, and is comprised so that it may have an intake valve and a discharge valve.

Moreover, as a preferable aspect of the electronic diaphragm pump of this invention, a suction valve and a discharge valve are comprised so that each may have a thin circular valve umbrella part and the valve fixed shaft which protrudes from the center part of this valve umbrella part.

Moreover, as a preferable aspect of the electronic diaphragm pump of this invention, the said valve case main body is provided with the valve attachment hole part and the partition wall in which the communication hole for suction or discharge was formed, The said valve fixed shaft is inserted in the valve attachment hole part, The thin circular valve body is configured to function as an open / close valve for venting the communication hole.

Since the electronic diaphragm pump of this invention is comprised as mentioned above, the edge of the outer periphery of a diaphragm can be hold | maintained more firmly, and it can prevent that looseness arises from the outer periphery of a diaphragm, and discharge amount does not change even by using for a long time. In addition, the leakage preventing effect is also improved, and a very excellent effect is exhibited that the parts holding the diaphragm do not collide with other parts. In particular, since the second pressing convex portion is disposed outside the first pressing convex portion, the diaphragm does not break from the pressing portion even by using for a long time.

FIG. 1 is a perspective view schematically showing a state in which the electromagnetic diaphragm pump of the present invention is disassembled into main parts. FIG.
Fig. 2 is a plan view showing a necessary portion of a main portion of the electromagnetic diaphragm pump of the present invention in cross-section.
Fig. 3 is a side view showing, in cross section, a necessary portion of the main part of the electronic diaphragm pump of the present invention.
4 is a partial cross-sectional enlarged view of the portion A of FIG. 2, and is a partial cross-sectional enlarged view showing a state immediately before the peripheral portion of the diaphragm is to be clamped and fixed using the first clamping member and the second clamping member. At this point, the first clamping member and the second clamping member are not joined.
FIG. 5 is a partial cross-sectional enlarged view of a portion A of FIG. 2, and is a partial cross-sectional enlarged view showing a state where the circumferential edge portion of the diaphragm is clamped and fixed using the first clamping member and the second clamping member.
It is a figure corresponding to FIG. 5, and is a partial cross section enlarged view which shows the modification of the state shown in FIG.
FIG. 7: is a figure corresponding to FIG. 5, and is a partial cross-sectional enlarged view which shows the modification of the state shown in FIG.
It is a figure corresponding to FIG. 5, and is a partial cross section enlarged view which shows the modification of the state shown in FIG.
9A, 9B and 9C are cross-sectional views illustrating suitable shapes of the first pressing convex portions, respectively.
10A and 10B are cross-sectional views illustrating the shapes of the second pressing convex portions, respectively.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

Further, the present invention is not limited to the embodiment described below, but can be carried out by various modifications within the scope not deviating from the technical idea. In addition, in the accompanying drawings, scales of up, down, left and right may be exaggerated for illustration, and scale may differ from an actual thing.

1 is a perspective view schematically showing a state in which the electronic diaphragm pump 1 of the present invention is disassembled into respective main parts. Fig. 2 is a plan view showing, in cross section, a necessary part of the main part of the electronic diaphragm pump of the present invention, and Fig. 3 is a side view showing, in cross section, a required part of the main part of the electronic diaphragm pump of the present invention.

As shown in FIGS. 1-3, the electromagnetic diaphragm pump 1 of this invention is provided between the pair of electromagnets 20 arrange | positioned in the main body frame 10, and the opposing surface of this pair of electromagnets 20. As shown in FIG. The first sandwiching member 50 and the second sandwiching which sandwich the vibrator 30 interposed therebetween, a pair of diaphragms 40 disposed at both ends of the vibrator 30, and the outer peripheral edge of the diaphragm. It is comprised with the member 60.

Although the main body frame 10 is not limited to this embodiment shown in figure, in this embodiment, the upper opening part 13 for inserting a pair of electromagnets 20 etc. from the upper part, the oscillator 30, etc. can be inserted. It has a pair of side opening part 15 which can attach and the 1st clamping member 50 and the 2nd clamping member 60 inside. A communication path (not shown) communicating with the input connection port 18 for sucking the fluid to be flowed by the pump and an output connection port 19 for discharging the fluid are formed in the main frame 10, (Not shown) are formed separately from each other.

The configuration of the present invention will be described in more detail.

In the electromagnetic diaphragm pump 1 of the present invention, the vibrator 30 is approximately perpendicular to the opposite direction of the electromagnet 20 according to the polarity change of the pair of electromagnets 20 arranged inside the main body frame 10. It is configured to reciprocate in the direction. As for the vibrator 30, the connecting shaft 31 is fixedly arrange | positioned at the both ends, As mentioned above, the opposing pair of diaphragms 40 are arrange | positioned and fixed at both ends of the vibrator 30. As shown in FIG.

The first center plate 71 and the second center plate 75 are fixed in a substantially center portion located in the inner circumferential portion of the diaphragm 40, and are substantially fixed to these combined center plates 71 and 75. The oscillator 30 (shafts 31 and 31 for connection) is fixed.

As mentioned above, the peripheral part of the diaphragm 40 is clamped by the 1st clamping member 50 and the 2nd clamping member 60, and is fixed. Moreover, the 1st clamping member 50 and the 2nd clamping member 60 are comprised so that it may be attached and fixed in the side opening part 15 of the main body frame 10. FIG.

1 to 3, the diaphragm 40 is provided with a ring-shaped bead portion 45 protruding inwardly at its circumferential edge portion, and the first sandwiched portion. The member 50 is comprised as the diaphragm base 50 located inside the diaphragm 40, and the 2nd clamping member 60 is comprised as the diaphragm holding part 60 located outside the diaphragm 40. As shown in FIG. have.

The diaphragm holding portion 60 located outside the diaphragm 40 has a function as a valve case body having a valve, and presses the circumferential edge of the diaphragm 40 so that the casing packing 80 and the casing cover ( 85 is fixed to the side of the main frame 10.

The intake valve 120 and the discharge valve 130 are attached to the diaphragm holding part 60 which functions as a valve case main body in predetermined directions so that each predetermined function (suction and discharge) may be performed, respectively. This will be described later in detail.

The basic structure of the electromagnetic diaphragm pump 1 of the present invention will be described in more detail with reference to Figs. 2 and 3. Fig.

As shown in FIG. 2, the pair of electromagnets 20 disposed to face each other is an E-type electromagnet core 22 and an electromagnet bobbin 24 in which a coil 23 for an electromagnet is wound around the core 22. It is composed with. An alternating current power source (not shown) is connected to the coil 23 for the electromagnet of the electromagnet 20 so as to generate a change (polarity change) of the magnetic pole at the same number of times as the frequency of the alternating current power source.

As described above, the oscillator 30 reciprocating in accordance with the change in the polarity of the electromagnet 20 is charged in the gap between the opposing faces of the pair of electromagnets 20 so as not to contact the electromagnet 20. In the case of this embodiment, the vibrator 30 has the plate main body part 35 and the connection shaft 31 formed in the both ends, as shown in FIG. 3, and the plate main body part 35 is square, for example. Permanent magnets 36 (for example, N pole) and 37 (for example, S pole) having different polarities of the phases are attached.

As shown in FIG. 2, it partitions by the recessed part of the diaphragm holding part 60 stuck in the side opening part 15 of the main body frame 10, and the casing cover 85 formed through the casing packing 80. As shown in FIG. Intake chamber 150 is formed. This intake chamber 150 communicates with the input connector 18 via a communication path (not shown). In substantially the same manner, as shown in FIG. 2, the diaphragm holding part 60 fixed to the side opening 15 of the main body frame 10 and the casing cover 85 formed through the casing packing 80 are provided. A partitioned discharge chamber 170 is formed. The discharge chamber 170 communicates with the output connector 19 via a communication path (not shown). The intake chamber 150 and the discharge chamber 170 are partitioned off by the partition wall 69.

As shown in the figure, a suction valve 120 is mounted on the partition wall 61 of the diaphragm holding portion 60 for partitioning the intake chamber 150 from the inside. The suction valve 120 is comprised with the thin circular valve umbrella part 121 which functions as a seal valve, and the valve fixed shaft 125 which protrudes from the center part of this valve umbrella part 121. As shown in FIG. The valve fixing shaft 125 is mounted and fixed to a fixing hole formed in the partition wall 61 (Fig. 2). Although not shown in the figure, it is preferable to form a protruding step portion for preventing the release after fixing, usually at the distal end of the valve fixing shaft 125. In addition, the plane of the side in which the valve fixed shaft 125 of the valve umbrella part 121 is located comprises what is called a (valve) seal plane.

By such a valve action of the intake valve 120, as shown in FIG. 2, the valve vent hole 62 formed in the partition wall 61 passes, and the fluid which flows in from the input connector 18 flows into the diaphragm chamber 160. As shown in FIG. Is inhaled. The diaphragm chamber 160 is substantially divided by the diaphragm 40 and the inner surface of the diaphragm holding portion 60 (in particular, the partition wall 61). And the fluid suctioned into the diaphragm chamber 160 is a valve vent hole formed in the partition wall 61 by the valve action of the discharge valve 130 mounted from the outside to the partition wall 61 of the diaphragm holding part 60. It passes through the 63, enters the discharge chamber 170, and is discharged from the output connector 19 via a communication path (not shown).

The form itself of the discharge valve 130 is basically the same as the above-mentioned intake valve 120, and the structure is a thin circular valve umbrella part 131 which functions as a seal valve as shown in FIG. The valve fixed shaft 135 which protrudes from the center part of the valve umbrella part 131 is comprised. The valve fixing shaft 135 is mounted and fixed to a fixing hole formed in the partition wall 61 (Fig. 2). It is preferable to form a stepped protrusion in the tip end portion of the valve fixing shaft 135 to prevent the pull-out after fixing. In addition, the plane of the side where the valve fixed shaft 135 of the valve umbrella part 131 is located comprises what is called a (valve) seal plane.

The valve action of the suction valve 120 and the discharge valve 130 will be further described. In accordance with the polarity change of the electromagnet 20 connected to the alternating current power source, the vibrator 30 reciprocates in the directions of the arrows α and β shown in Figs. The diaphragm 40 disposed at both ends of the vibrator 30 is deformed to the same amount of displacement as the stroke of the vibrator 30 about the central portion of the diaphragm 40 in synchronism with the movement of the vibrator 30. [ As a result, a change in capacitance of the diaphragm chamber 160 occurs, and attention is paid to the diaphragm chamber 160 on the (β) direction side in FIG. 2. When the diaphragm 40 is deformed in the direction of the arrow α, the diaphragm chamber 160 expands and becomes negative pressure, the suction valve 120 is opened, and fluid is sucked into the diaphragm chamber 160. In contrast, when the diaphragm 40 is deformed in the direction of the arrow β, the diaphragm chamber 160 on the (β) direction side is compressed to become a static pressure, and the discharge valve 130 is opened, and the fluid is diaphragm chamber 160. It discharges from the inside to the discharge chamber 170. These operations are alternately performed continuously, and the fluid is continuously discharged.

In addition, the specific shape of the intake valve 120 and the discharge valve 130 used in the present invention, for example, the size and thickness of the outer diameter of the valve umbrella 121 (131) according to the specifications of the electronic diaphragm pump Set it appropriately. The same applies to the number of the suction valve 120 and the discharge valve 130 to be used. The rubber material constituting the suction valve 120 and the discharge valve 130 is not particularly limited. For example, EPDM or silicone rubber is a suitable example.

(Explanation of main parts of the present invention)

The main part of the electronic diaphragm pump of this invention is demonstrated, referring FIGS.

4 is a partial cross-sectional enlarged view near the portion A in FIG. 2, and is immediately attempted to sandwich and fix the outer circumferential edge of the diaphragm 40 using the first clamping member 50 and the second clamping member 60. A partial cross-sectional enlarged view showing a state of. At this point, the first clamping member 50 and the second clamping member 60 are not joined.

FIG. 5 is an enlarged partial cross-sectional view near the portion A in FIG. 2, illustrating a state in which the outer circumferential edge portion of the diaphragm 40 is sandwiched and fixed using the first clamping member 50 and the second clamping member 60. Partial section enlarged view.

It is a figure corresponding to FIG. 5, and is a partial cross section enlarged view which shows the modification of the state shown in FIG. FIG. 7: is a figure corresponding to FIG. 5, and is a partial cross-sectional enlarged view which shows the modification of the state shown in FIG. It is a figure corresponding to FIG. 5, and is a partial cross section enlarged view which shows the modification of the state shown in FIG.

The main part of the present invention is a fixing member, ie, the first clamping member 50 and the second clamping member, which clamps and fixes the circumferential edge portion of the diaphragm 40 having the ring-shaped bead portion 45 projecting in a direction perpendicular to the membrane surface. It is in the structure of the member 60.

In the embodiment shown in FIGS. 1 to 8, the diaphragm holder 50 located inside the diaphragm 40 corresponds to the first clamping member 50, and the diaphragm holding unit located outside the diaphragm 40. Reference numeral 60 corresponds to the second sandwiching member 60.

Moreover, the diaphragm 40 in this embodiment has the ring-shaped bead part 45 which protruded in the inner side (1st clamping member 50 side: diaphragm stand 50 side) in the periphery edge part. Equipped. That is, in the peripheral part of the diaphragm 40, the ring-shaped bead part 45 which protrudes perpendicularly with respect to the 1st membrane surface 41 which comprises a diaphragm plane is provided. The 1st film surface 41 in this embodiment has shown the inner surface of the diaphragm 40. FIG.

Although there is no restriction | limiting in particular in the rubber material which comprises the diaphragm 40, Fluoro rubber which is excellent in heat resistance and corrosion resistance, and also excellent in flexibility is mentioned as a suitable example.

As shown in FIG. 4 and FIG. 5, the diaphragm stand 50 is provided with the recessed part 55 which accommodates the ring-shaped bead part 45 of the diaphragm 40 in the peripheral part. In addition, the diaphragm stand 50 in this embodiment is provided with the recessed part 59 for accommodating the outer peripheral end 49 of the diaphragm 40 in the peripheral edge part, and the diaphragm (in the recessed part 59). When the outer peripheral end 49 of 40 is received, the second membrane surface 42 of the diaphragm on the side where the bead portion 45 is not formed and the outermost surface 52 of the diaphragm stand 50 are substantially flush with each other. Consists of.

The diaphragm holding part 60 which is a 2nd clamping member is the pressing surface which can press the 2nd membrane surface 42 (side in which the bead part 45 is not formed) of the diaphragm 40 in the peripheral part ( 62). This press surface 62 has the 1st press convex part 66 whose cross-sectional shape has a curved-shaped part, and the 2nd press convex part 67 which has an acute-angled protrusion of a cross-sectional shape.

The 1st press convex part 66 and the 2nd press convex part 67 which protruded are formed in the ring surface at the press surface 62 formed in the periphery of the diaphragm holding part 60. As shown in FIG. It is preferable that especially the 1st press convex part 66 and the 2nd press convex part 67 formed in ring shape are arrange | positioned so that it may become concentric circles.

"The cross-sectional shape has a curved shape part" means, for example, a shape in which a frying pan is covered as shown in FIG. 9A, or a shape in which curved portions are formed in each of the trapezoidal upper sides as shown in FIG. 9B, As shown to FIG. 9C, the thing etc. which cut out a part of arc of a circle or an ellipse are mentioned as a suitable example which shows a specific form.

As a suitable example, "the cross-sectional shape is provided with the acute-shaped protrusion" is a cross-sectional triangular shape, for example as shown to FIG. 10A. In this case, the triangle of the cross section is not limited to an equilateral triangle or an isosceles triangle, and may be a nonuniform deformation triangle in which these are deformed.

The sharpness of the tip of the acute angle may be governed by a method of making an acute shape, for example, a molding method, etc., but in the present invention, it is based on resin molding in particular, and has a sharpness on the basis of the resin molding method. All you have to do is. As shown in FIG. 10A, the acute angle θ of the tip is 30 to 90 degrees, preferably 45 to 60 degrees. If this angle becomes less than 30 degrees and becomes too small, there exists a tendency for the problem of heat insulation of a diaphragm to arise. On the other hand, when this angle exceeds 90 degrees, when an angle becomes too large, there exists a tendency for the problem that a pressure pressure falls.

In view of the ease of manufacture and the compactness of the member, the second press convex portion 67 is preferably configured to have one acute angle as shown in Fig. 10A. As shown to FIG. 10B, you may comprise so that it may be provided with several acute angle part (for example, two or more).

The 1st press convex part 66 is arrange | positioned inside the 2nd press convex part 67. As shown in FIG. The first pressing convex portion 66 is (1) in a positional relationship that is completely included in the area occupied by the base of the bead portion 45, or overlaps with a portion of the area occupied by (2) or the base of the bead portion 45. It is formed so that it may be in a positional relationship, or the positional relationship which fully contains the area which the base of the (3) or the bead part 45 occupies. By satisfying any one of these relationships, the bead part 45, which is an elastic body, is pushed and spread in the concave part 55 accommodating the bead part 45, which is pressed against the wall surface of the concave part 55 to improve the holding force. Fully expressed.

This relationship will be described in detail with reference to FIGS. 5 to 8.

(1) The 1st press convex part 66 is in the positional relationship completely contained in the area which the base of the bead part 45 occupies means the state shown in FIG. 5, for example. That is, in the sectional drawing of FIG. 5, it says the state of the positional relationship in which the width W1 of the 1st press convex part 66 is completely contained among the width Wb of the area which the base of the bead part 45 occupies. . That is, when Wb> W1, the bead part 45 necessarily exists under the place where the 1st press convex part 66 presses.

(2) The 1st press convex part 66 in the positional relationship which overlaps with a part of area occupied by the base part of the bead part 45 says the state shown in FIG. 6 or 7, for example. That is, in the sectional drawing of FIG. 6 or 7, WHEREIN: The positional relationship which a part of width W1 of the 1st press convex part 66 overlaps in width Wb of the area which the base of the bead part 45 occupies. Say the status. That is, a part of the bead part 45 always exists under the place where the 1st press convex part 66 presses. In addition, the state shown in FIG. 6 is a case where the 1st press convex part 66 protrudes a little outward from the containment relationship in relationship with the bead part 45, and the state shown in FIG. 7 is a 1st press convex part ( 66 is a case where it protrudes slightly inward from the inclusion relationship in the relationship with the bead part 45. It can be said that it is more preferable to be in the state shown in FIG. 7 from the point that the assembly member can be made compact and the whole apparatus can be made compact. That is, it becomes possible to shorten the length extended to the outer peripheral side more than the bead part 45. FIG.

In addition, since the case shown in FIG. 6 or FIG. 7 is Wb> W1, the overlap ratio of the width W1 into the width Wb, that is, the proportion of the width W1 is included in the width Wb. It is shown as the ratio (δ ₀ ). The value of δ ₀ is preferably 50% or more, particularly 60 to 100%.

(3) The 1st press convex part 66 in the positional relationship which includes the area occupied by the base of the bead part 45 completely means the state shown in FIG. 8, for example. That is, in the sectional drawing of FIG. 8, the width Wb of the area which the base of the bead part 45 occupies means the state of the positional relationship completely contained by the width W1 of the 1st press convex part 66. FIG. . That is, as Wb ≦ W1, the entire bead portion 45 is necessarily included under the place where the first pressing convex portion 66 is pressed.

In addition, from the state shown in FIG. 8, by moving the relative positional relationship of the 1st press convex part 66 and the bead part 45 to the left and right of a figure suitably, as described in said (2), the 1st press convex part ( 66 may form a positional relationship which overlaps with a portion of the area occupied by the base of the bead portion 45. In the case where overlapping positional relations are formed, the overlapping ratio with the width W1 in the width Wb in the case shown in FIG. 8 is Wb ≦ W1, so that the width is at a certain ratio with respect to the width Wb. Whether (W1) is contained is shown as an overlap ratio (δ ₁ ). The value of δ ₁ is preferably 50% or more, particularly 60 to 100%.

Especially preferable among said (1)-(3) is the aspect of (1). Since the effect of improving the holding force by pressing and spreading the bead portion 45, which is an elastic body, in the concave portion 55 accommodating the bead portion 45 tends to be remarkably expressed. to be.

On the other hand, as shown in FIGS. 5-8, the 2nd press convex part 67 provided with the other acute-shaped protrusion is the diaphragm of the outer side (right side of drawing) outside the area which the base of the bead part 45 occupies. It is formed to press. That is, the width W2 of the 2nd press convex part 67 is not contained in the width Wb of the area which the base part of the bead part 45 occupies, and exists in the position completely outward (2nd). The bead part 45 does not exist under the place where the press convex part 67 presses). By setting it as such a position structure, the 2nd press convex part 67 can be effectively penetrated in a diaphragm, and the synergistic effect of the holding force improvement with the above-mentioned holding effect with the 1st press convex part 66 is expressed.

Next, the magnitude | size relationship etc. of the bead part 45, the 1st press convex part 66, and the 2nd press convex part 67 are demonstrated, referring FIGS.

When the width of the first pressing convex portion 66 described above is set to W1 and the width of the area occupied by the base of the bead portion 45 is set to Wb, W1 / Wb = 0.4 to 1.0, more preferably 0.6 to 0.8.

A relationship such as W1 / Wb> 1, W1 / Wb <1, W1 = Wb, etc. may be considered, but the concave portion 55 accommodating the bead portion 45 is pressed to spread the bead portion 45, which is an elastic body, to concave. It is particularly preferable to make the relationship W1 <Wb from the viewpoint of pressing the wall surface of the part 55 to improve the holding force.

In addition, as shown in FIG. 5, the thickness of the bead part 45 itself is Tb, the thickness of the diaphragm outer peripheral part is Th, the height of the 1st press convex part 66 is H1, and the height of the 2nd press convex part 67 is shown. When H is set to H2, H1 / (Tb + Th) = 0.05 to 0.12, more preferably 0.08 to 0.1, preferably H2 / Th = 0.1 to 0.3, more preferably 0.15 It is recommended to set it in the range of ~ 0.25.

Moreover, the ratio of the length Lo of the diaphragm 40 outside the bead part 45 shown in FIG. 5, and the thickness Tb of the bead part itself itself is Lo / Tb = It is good to set it to 0.5-1.0.

In addition, when the width of the first pressing convex portion 66 is set to W1 and the height is H1, and the width of the second pressing convex portion 67 is set to W2 and the height is set to H2, H1 / W1 = 0.2 to 0.5, and more. Preferably it is 0.3-0.4, H2 / W2 = 0.5-2.0, More preferably, it is good to set in the range of 0.8-1.2.

In addition, although the width W1 of the 1st press convex part 66 and the width W2 of the 2nd press convex part 67 may be set suitably according to the design specification of an electronic diaphragm pump, the value of W1 is normally It becomes about 1.0-2.0mm, and the value of W2 becomes about 0.3-1.0mm.

In addition, the above-described embodiment of the electronic diaphragm pump includes a ring-shaped bead portion 45 in which the diaphragm 40 protrudes inwardly at its circumferential portion, and the first clamping member has an inner side of the diaphragm 40. It was comprised as the diaphragm stand 50 located in the inside, and the 2nd clamping member was comprised as the diaphragm holding part 60 located in the outer side of the diaphragm 40. As shown in FIG.

However, the present invention is not limited to this embodiment, and the projecting direction of the bead portion 45 is changed by 180 degrees, that is, the diaphragm 40 includes a ring-shaped bead portion that protrudes outwardly at its circumferential portion, and the first The clamping member may be a diaphragm holding portion located outside the diaphragm, and the second clamping member may be configured as a diaphragm stand positioned inside the diaphragm. In this case, the first membrane surface of the diaphragm becomes an outer surface, and a concave portion for accommodating the bead portion is formed in the diaphragm holding portion, and a pressing surface for pressing the second membrane surface of the diaphragm is formed on the diaphragm stage, and the first pressing surface is formed on the pressing surface. The pressing convex portion and the second pressing convex portion are formed.

In addition, although it becomes supplementary explanation, in FIG. 1, the code | symbol 91, 95 is a valve cover, the code | symbol 201 is a frame packing, the code | symbol 202 is a frame cover, the code | symbol 211 is a tank packing, the code | symbol 212 is a tank cover, and the code | coated 220 is a dustproof rubber , Reference numeral 230 denotes a bracket, and 241 and 245 denote diaphragm protective sheets.

[Examples]

Hereinafter, specific examples are shown and the present invention will be described in more detail.

(Example 1)

The electronic diaphragm pump provided with the 1st clamping member 50 and the 2nd clamping member 60 which are the principal part structures of this invention as shown in FIG. 5 was produced (Example 1 sample). That is, the 1st press convex part 66 (the form shown to FIG. 9A) is in the positional relationship completely contained in the area occupied by the base of the bead part 45, and is provided with the other acute-shaped protrusion. The 2nd press convex part 67 (it is a form shown in FIG. 10A, (theta) = 53 degrees) was comprised so that the diaphragm (EPDM) of the outer side (right side of drawing) outside the area occupied by the base of the bead part 45 may be pressed. .

Each dimension ratio in FIG. 5 was as follows.

W1 / Wb = 0.6

H1 / W1 = 0.3

H2 / W2 = 1.0

H1 / (Tb + Th) = 0.1

H2 / Th = 0.2

Lo / Tb = 0.7

(Comparative Example 1)

In the above Example 1 sample, the second pressing convex portion 67 was not provided. That is, it was set as the structure provided only the 1st press convex part 66. Otherwise, the electronic diaphragm pump was produced like Example 1 above (Comparative example 1 sample).

When the durability test of the long-term continuous operation was performed about the above-mentioned Example 1 sample and the comparative example 1 sample, it was confirmed that there is an obvious difference, and the Example 1 sample was remarkably excellent in durability.

The effect of this invention is clear from the above result. That is, the present invention has an electromagnet, a vibrator vibrating according to the change in polarity of the electromagnet, a diaphragm disposed at the end of the vibrator, and a first clamping member and a second clamping member for pinching and fixing the circumferential edge of the diaphragm. The diaphragm has a ring-shaped bead portion projecting in a direction perpendicular to the first membrane surface at its circumferential portion, the first clamping member has a recess for accommodating the bead portion, and the second clamping member is formed with the bead portion. It has a pressing surface which presses the 2nd membrane surface of the diaphragm which is not made, The said pressing surface of the said 2nd clamping member is provided with the 1st press convex part whose cross section shape has a curved shape, and a cross section shape is provided with an acute-shaped protrusion. It has a 2nd press convex part, The said 1st press convex part is arrange | positioned inside a said 2nd press convex part, and a 1st press convex part is It is formed to be in a positional relationship completely contained in the area occupied by the base of the bead portion, or formed to be in a positional relationship overlapping with a part of the area, or configured to be in a positional relationship completely including the area occupied by the base of the bead part. Therefore, the edge around the outer periphery of the diaphragm can be held more firmly, and looseness can be prevented from occurring from the outer periphery of the diaphragm. Thus, the discharge amount does not change even after long use, and the leakage preventing effect is also improved, and the diaphragm is held. A very good effect is realized that the part being made does not have a possibility of colliding with another part.

INDUSTRIAL APPLICABILITY The present invention can be used in the field of device technology related to fluid transportation, such as an electronic diaphragm pump for a domestic fuel cell, a fuel gas such as LPG as a fluid, or an electronic diaphragm pump for pumping air.

Claims (12)

An electromagnet, a vibrator vibrating in response to a change in polarity of the electromagnet, a diaphragm disposed at an end of the vibrator, and a first clamping member and a second clamping member for pinching and fixing the circumferential edge of the diaphragm,
The diaphragm has a ring-shaped bead that protrudes in a direction perpendicular to the first membrane surface at the peripheral portion thereof.
The first sandwiching member has a recess for accommodating the bead portion,
The second holding member has a pressing surface for pressing the second membrane surface of the diaphragm in which the bead portion is not formed,
The pressing surface of the second sandwiching member has a first pressing convex portion having a cross-sectional shape having a curved shape portion, and a second pressing convex portion having a cross-sectional shape having an acute-shaped protrusion,
The first pressing convex portion is disposed inward from the second pressing convex portion, and the first pressing convex portion is in a positional relationship completely contained in an area occupied by the base of the bead portion, or a positional relationship overlapping with a part of the area. An electronic diaphragm pump, wherein the diaphragm pump is formed so as to be in a position or is in a positional relationship that completely includes an area occupied by the base of the bead portion. 2. The electronic diaphragm pump according to claim 1, wherein the second pressing convex portion is formed to press the diaphragm outside the area occupied by the base of the bead portion. The electronic diaphragm pump according to claim 1, wherein when the width of the first pressing convex portion is set to W1 and the width of the area occupied by the base of the bead portion is set to Wb, W1 / Wb = 0.4 to 1.0. The thickness of the bead portion itself is Tb, the thickness of the outer peripheral portion of the diaphragm is Th, the height of the first pressing convex portion is H1, and the height of the second pressing convex portion is H2. H1 / (Tb + Th) = 0.05 ~ 0.12, H2 / Th = 0.1 ~ 0.3 Electronic diaphragm pump. The width of the first pressing convex portion is W1, the height is H1, and the width of the second pressing convex portion is W2 and the height is H2. H1 / W1 = 0.2 to 0.5, H2 / W2 Electronic diaphragm pump, characterized in that = 0.5 ~ 2.0. The electronic diaphragm pump according to claim 1, wherein the first pressing convex portion and the second pressing convex portion are arranged in a ring shape on the pressing surface of the second sandwiching member. The electronic diaphragm pump according to claim 6, wherein the first pressing convex portion and the second pressing convex portion are arranged to be concentric with the pressing surface of the second sandwiching member. 2. The diaphragm according to claim 1, wherein the diaphragm has a ring-shaped bead that protrudes inward,
And the first clamping member is a diaphragm stand positioned inside the diaphragm, and the second clamping member is a diaphragm holding part positioned outside the diaphragm. 2. The diaphragm according to claim 1, wherein the diaphragm has a ring-shaped bead that protrudes outward from the peripheral portion thereof.
And the first clamping member is a diaphragm holding part located outside the diaphragm, and the second clamping member is a diaphragm stand positioned inside the diaphragm. The electronic diaphragm pump according to claim 1, wherein the diaphragm holding part has a function as a valve case body including a valve, and has a suction valve and a discharge valve. The electronic diaphragm pump according to claim 10, wherein the intake valve and the discharge valve are each provided with a thin circular valve umbrella portion and a valve fixing shaft protruding from the central portion of the valve umbrella portion. 12. The valve body according to claim 11, wherein the valve case body includes a partition wall having a valve attachment hole and a communication hole for suction or discharge, and the valve fixing shaft is inserted into and mounted in the valve attachment hole. An electronic diaphragm pump, wherein the diaphragm pump functions as an on / off valve for venting the communication hole.

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