JP4138989B2 - Valve structure and electromagnetic diaphragm pump using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a novel valve structure in which a plurality of vent holes are arranged on multiple circumferences of double or more around the center part of a circular valve umbrella part, and this is suitably applied. The present invention relates to an electromagnetic diaphragm pump.
[0002]
Speaking of electromagnetic diaphragm pumps, in particular, by passing an alternating current through the opposing electromagnets, the vibrator interposed between the opposing electromagnets is reciprocated at the same frequency as the alternating current power source, and the both ends of the vibrator are moved. The deformation of the pair of diaphragms arranged so as to face each other is utilized, and the compressed gas is continuously discharged by the volume change in the case partitioned by the diaphragm and the action of the valve. Such an electromagnetic diaphragm pump is used, for example, for aeration in an aeration septic tank, for oxygen supplementation of fish culture, for air fountain such as a bubble bath, a small compressor, and the like.
[0003]
[Prior art]
Conventionally, for example, an electromagnetic diaphragm pump has been used as one of pumps for aeration of septic tanks and oxygen replenishment of fish farms.
[0004]
Such an electromagnetic diaphragm pump is disposed so as to face a box-shaped electromagnet case having an open upper portion and the electromagnet case as disclosed in, for example, Japanese Utility Model Publication No. 2-83387. A pair of electromagnets fixed to each other and a vibrator that is interposed between opposed surfaces of the pair of electromagnets and reciprocates as the polarity of the electromagnet changes. Furthermore, a pair of diaphragms arranged so as to face each other is formed at both ends of the vibrator, and the outer peripheral edge of the diaphragm is sandwiched between an electromagnet case and a valve case body having an intake valve and a discharge valve. It is fixed.
[0005]
In the electromagnetic diaphragm pump, the vibrator reciprocates as the polarity of the electromagnet changes, and the diaphragm connected to the vibrator vibrates, thereby sucking external air into the compression chamber and compressing the sucked air. The operation of discharge is continuously repeated through the suction valve and the discharge valve.
[0006]
The suction valve and the discharge valve used in such an electromagnetic diaphragm pump are generally used as an umbrella valve, which is a thin-circular valve umbrella part and projects from the valve umbrella part. The shape is provided with a valve fixing protrusion. The thin-circular shaped valve umbrella portion acts to control the opening and closing of the vent hole, which is the air circulation port, in accordance with the vibration of the diaphragm. Normally, the ventilation holes, which are air circulation ports, are arranged on one circumference around the valve fixing shaft, with about 1 to 10 round holes with a maximum diameter of about 5mm per intake valve and discharge valve. Is formed.
[0007]
By the way, the air flow rate through the vent hole is one of the indexes of the pump performance, and there is a case where it is desired to increase the air flow rate while keeping the size of the apparatus itself at the actual design stage. However, if the diameter per vent hole is increased in order to increase the ventilation flow rate, a thin valve umbrella portion is deformed so as to sink into the vent hole due to back pressure when sealing the vent hole. There is a possibility that the durability as a lowering. On the other hand, when the diameter per vent hole is reduced and the number of holes is increased, the tube resistance of the vent hole is increased and the flow rate per unit hole area is reduced. In order to cope with such a problem, for example, as disclosed in Japanese Utility Model Publication No. 7-36139, a method of increasing the number of disc-shaped valves themselves and providing two or more can be considered.
[0008]
[Problems to be solved by the invention]
However, in such a method, the number of parts increases, which causes an increase in assembly man-hours and an increase in member management man-hours, which directly increases costs. In addition, since a plurality of valves are provided, the management of valve replacement due to the occurrence of valve trouble is complicated. Furthermore, it can be said that it is difficult to cope with space saving.
[0009]
The present invention was devised under such circumstances, and its purpose is not only to have excellent durability, but also to increase the discharge amount, and to reduce costs and space by reducing work man-hours. It is an object of the present invention to provide a valve structure that can cope with the above and an electromagnetic diaphragm pump using the valve structure.
[0010]
[Means for Solving the Problems]
In order to achieve such an object, the valve structure of the present invention is a valve structure having a plurality of vent holes and a thin circular valve umbrella portion that opens and closes the vent holes, and the plurality of vent holes Is configured to be arranged on a multiple circumference of two or more with the center of the central part of the circular valve head part as the center.
[0011]
Further, as a preferred aspect of the present invention, among the plurality of ventilation holes arranged on the multiple circumference, the diameter of the ventilation hole arranged on the innermost circumference is a communication diameter arranged on the outermost circumference. It is configured to be set larger than the pore diameter.
[0012]
Moreover, as a preferable aspect of the present invention, the plurality of vent holes arranged on the multiple circumference are configured to be circular.
[0013]
Moreover, as a preferable aspect of the present invention, the plurality of air holes arranged on the multiple circumference are configured to have a substantially trapezoidal shape extending outward.
[0014]
Moreover, as a preferable aspect of the present invention, the plurality of air holes arranged on the same circumference are configured to be arranged with the same shape and the same pitch.
[0015]
Moreover, as a preferable aspect of the present invention, the vent holes arranged on the inner side are formed in a positional relationship in which a triangle is formed by this and two vent holes arranged on the outer side.
[0016]
An electromagnetic diaphragm according to the present invention includes a case-like electromagnet case, a pair of electromagnets arranged so as to face each other in the electromagnet case, and a change in polarity of the electromagnet interposed between facing surfaces of the pair of electromagnets. Accordingly, a vibrator that reciprocates in a direction perpendicular to the facing direction of the electromagnet, a pair of elastic diaphragms disposed so as to face both ends of the vibrator, and a plurality of diaphragms separated by the diaphragm, An electromagnetic diaphragm pump having a vent hole, and a valve case main body having one intake valve and one discharge valve each having a thin circular valve umbrella portion for opening and closing the vent hole, wherein the plurality of vent holes Is configured to be arranged on a multiple circumference of two or more with the center of the central part of the circular valve head part as the center.
[0017]
The plurality of vent holes formed in the valve structure of the present invention are configured to be arranged on a multiple circumference of double or more around the central part of the circular valve head part, so that the flow rate is increased. It is possible to cope with cost reduction and space saving by reducing work man-hours.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. In order to facilitate understanding of the valve structure of the present invention, a case where the valve structure is applied to an electromagnetic diaphragm pump will be described below as a preferred example.
[0019]
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.
[0020]
FIG. 2 is a front view showing a necessary part of the main part of the electromagnetic diaphragm pump of the present invention in cross section, and FIG. 3 is a plan view showing a necessary part of the main part of the electromagnetic diaphragm pump of the present invention in cross section. FIG.
[0021]
FIG. 4 is a perspective view showing a typical form of an intake valve and a discharge valve used in the electromagnetic diaphragm pump of the present invention.
[0022]
As shown in FIG. 1, a plate-like bottom base plate 7 is attached and fixed to the upper surface of the lower tank container 5 so as to be in a sealed state. An electromagnet case 10 is installed near the approximate center of the plate-like bottom base plate 7. In general, the electromagnet case 10 is not placed directly on the bottom base plate 7 but is installed, for example, via a vibration-proof rubber 9 so that a cushioning action is substantially exerted. In the case of the present embodiment, the electromagnet case 10 includes a bottomed container-like electromagnet case body 11 having an opening, and a plate-like electromagnet case lid 15 for covering the opening.
[0023]
The electromagnet case 10 is interposed between a pair of electromagnets 21 and 25 arranged so as to face each other and the facing surfaces of the pair of electromagnets 21 and 25. A vibrator 30 that reciprocates in a direction perpendicular to the direction is inserted. Furthermore, the shaft 30 for connection is fixed to the both ends of the vibrator 30, and thereby a pair of diaphragms 40 facing the both ends of the vibrator 30 are arranged.
[0024]
A diaphragm electromagnet side center plate 70 and a diaphragm valve case side center plate 80 are sandwiched and fixed at the center of the diaphragm 40, and the resonator 30 ( The connecting shafts 31, 31) are fixed.
[0025]
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 lid body 60 are fixed to both sides of the electromagnet case 10 so as to press the diaphragm 40.
[0026]
A suction valve 120 and a discharge valve 130 are attached to the valve case main body 50 in specific directions so as to perform predetermined functions (suction and discharge), respectively. This will become more apparent from the description of FIG.
[0027]
The valve case lid 60 includes a hose connecting portion 61 protruding outward, and the upper port 91 of the L-type rubber hose 90 is inserted into the connecting portion 61, and the lower port 95 of the L-type rubber hose 90 is connected to the bottom base plate. 7 is inserted into the hole 7a.
[0028]
Thus, the electromagnet case 10 arranged on the bottom base plate 7 and the main member fixed to the electromagnet case 10 are completely covered by the outer case 100, and the bottom of the outer case 100 is usually a lower tank. The container 5 is fixed in a sealed state in contact with the peripheral edge of the container 5 or the peripheral edge of the bottom base plate 7. The outer case 100 is provided with an air filter (not shown) at its upper part, and the air filter is fixed by an air filter cover 101 so that external air flows into the outer case 100 through the air filter. Reference numeral 110 in FIG. 1 indicates a rubber leg.
[0029]
Next, based on FIGS. 2 and 3, the basic structure of the electromagnetic diaphragm pump of the present invention will be described in more detail.
[0030]
As shown in FIGS. 2 and 3, the pair of electromagnets 21 and 25 arranged to face each other includes an E-type electromagnet cores 22 and 26 and electromagnet bobbins 24 around which electromagnet coils 23 and 27 are wound. 28. The electromagnet bobbins 24 and 28 each have a cylindrical shape having flange portions 24a and 28a at both ends, and these electromagnet bobbins 24 and 28 are inserted into the central cores 22a and 26a of the E-type electromagnet cores 22 and 26, respectively. Assembled in finished form. An alternating current power supply is connected to the electromagnet coils 23 and 27 of the electromagnets 21 and 25, and the magnetic pole changes (polarity changes) are generated the same number of times as the frequency of the alternating current power supply.
[0031]
In the gap between the opposing surfaces of the pair of electromagnets 21 and 25, the vibrator 30 that reciprocates as the polarity of the electromagnets 21 and 25 changes is mounted so as not to contact the electromagnet. In the case of the present embodiment, the vibrator 30 has a plate main body portion 35 and connecting shafts 31 and 31 formed at both ends thereof, and the plate main body portion 35 has four rectangular permanent shapes with different polarities. Magnets 36, 36 (for example, N pole), 37, 37 (for example, S pole) are embedded.
[0032]
A pair of centrally perforated disc-shaped elastic bodies (for example, rubber) diaphragms 40 are disposed at both ends of the vibrator 30 so as to face each other. The outer peripheral flange portions 41 of the pair of diaphragms 40 are connected to the electromagnet case 10. The valve case body 50 is clamped and fixed. The inner peripheral portion 45 of the diaphragm 40 is fixed in a state of 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 shafts 31, 31).
[0033]
As shown in FIG. 3, an intake chamber 150 is formed by the valve case body 50 and the valve case lid 60 fixed to the electromagnet case 10, and the intake chamber 150 communicates with the interior of the electromagnet case 10 through the communication hole 59. is doing. A suction valve 120 is mounted on the intake side outer wall 51 of the valve case body 50 that partitions the intake chamber 150 from the inside.
[0034]
A detailed configuration of the intake valve 120 is shown in FIG. As shown in this figure, the intake valve 120 includes a thin circular valve umbrella 121 and a valve fixing protrusion 125 protruding from the central part of the valve umbrella 121. Then, the valve fixing protrusion 125 is mounted and fixed in a fixing hole formed in the valve case main body 50 (FIG. 3). In the present invention, since a single valve is used for the same application without using many valves for the same application (inhalation or discharge) as shown in the prior art, the valve umbrella is used. The size of the part 121 is set slightly larger than that of the conventional multi-valve type.
[0035]
As shown in FIG. 4, a protrusion-like locking portion 126 is usually formed at the tip of the valve-fixing projection 125 to prevent the valve-fixing projection 125 from coming off after fixing. In addition, the plane 121a on the side where the valve fixing protrusion 125 of the valve umbrella 121 is located is a plane on the so-called (valve) seal side. In the case of the electromagnetic diaphragm pump in the present invention, the surface roughness Ra of the flat surface on the seal side of the valve head portion is set in the range of 0.5 to 3.0 μm, preferably 0.8 to 1.5 μm. Is good. Surface roughness Ra prescribed | regulated by this invention is synonymous with centerline average roughness, and is a numerical value measured based on JISB0601 (1982). The value of the surface roughness Ra is less than 0.5 μm, and if it becomes too small, there is a disadvantage that noise cannot be reduced. Further, if this value exceeds 3.0 μm and becomes too large, there arises a disadvantage that the sealing performance as a valve does not sufficiently function.
[0036]
The thickness of the valve head portion 121 is 0.5 to 1.5 mm, preferably 0.7 to 1.2 mm. Within such a range, the sealing performance as a valve and the reduction of noise can be effectively realized.
[0037]
In addition, the central part (the part surrounded by the dotted line in the drawing) of the flat surface 121b opposite to the seal side has a relationship with the valve fixing protrusion 125, so that the strength of the valve head part is maintained. Slightly thick.
[0038]
Due to the valve action of the suction valve 120, air is sucked into the diaphragm chamber 160 through the plurality of vent holes 221 and 222 disposed on the outer wall 51 on the double circumference as shown in FIG. 3. The diaphragm chamber 160 is partitioned by the diaphragm 40, the intake side outer wall 51 and the discharge side outer wall 55 of the valve case body 50, and the discharge valve 130 is mounted on the discharge side outer wall 55 from the outside.
[0039]
The form of the discharge valve 130 is basically the same as that of the suction valve 120 described above, and the configuration thereof is as shown in FIG. 4 from the thin circular shape of the valve umbrella portion 131 and the central portion of the valve umbrella portion 131. And a valve-fixing protrusion 135 that protrudes. Then, the valve fixing projection 135 is mounted and fixed in a fixing hole formed in the valve case body 50 (FIG. 3). A protrusion-like locking portion 136 is usually formed at the tip of the valve fixing protrusion 135 to prevent the valve fixing protrusion 135 from coming off after fixing. A flat surface 131a on the side where the valve fixing projection 135 of the valve head portion 131 is located is a surface on the seal side. The surface roughness Ra of the flat surface on the seal side of the valve head portion 132 is also preferably set to be the same as that of the intake valve 120. The same applies to the setting of the thickness of the valve head portion 131.
[0040]
Due to the valve action of the discharge valve 130, as shown in FIG. 3, the air in the diaphragm chamber 160 passes through the plurality of vent holes 231 and 232 arranged on the discharge-side outer wall 55 on the double circumference, and the discharge chamber 130 170 is discharged. The air discharged into the discharge chamber 170 passes through the L-type rubber hose 90, enters the lower tank container 5, and is discharged through the discharge port 5a (FIG. 1).
[0041]
The valve actions of the intake valve 120 and the discharge valve 130 are performed based on the following operations. That is, with the change in polarity of the electromagnets 21 and 25 connected to the AC power source, the vibrator 30 reciprocates in the directions of arrows (A) and (B) in the drawing at the same frequency as the AC power source. The diaphragms 40 arranged at both ends of the vibrator 30 in synchronism with the movement of the vibrator 30 are deformed by the same displacement amount as the stroke of the vibrator 30 around the center portion of the diaphragm 40. As a result, a change in the capacity of the diaphragm chamber 160 occurs, and when 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. Thus, the suction valve 120 is opened, and air is sucked into the diaphragm chamber 160. On the contrary, 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 diaphragm chamber 160 into the discharge chamber 170. These operations are alternately performed continuously, and compressed air is continuously discharged. The basic operating principle itself including such a valve mechanism is already a known technique.
[0042]
The main part of the invention in the present invention is a valve structure having a plurality of vent holes and a thin circular valve umbrella portion that opens and closes the vent holes, and the plurality of vent holes are circular valve umbrella portions. The center portion is arranged so as to be arranged on a multiple circumference of double or more.
[0043]
The principal part of such an invention is demonstrated in detail based on FIGS.
[0044]
FIG. 5A is a front view of a valve case main body 50 provided with a plurality of vent holes, to which a suction valve 120 and a discharge valve 130 for opening and closing the vent holes are attached, and FIG. It is an AA cross-sectional arrow view of (a). FIG. 6 is a front view for explaining an arrangement example of a plurality of vent holes. FIG. 7 is a front view for explaining another arrangement example of the plurality of vent holes. FIGS. 8A to 8C are drawings for explaining the operation of the intake valve 120 and the discharge valve 130 attached to the valve case main body 50. FIG.
[0045]
The shapes of the intake valve 120 and the discharge valve 130 in the present invention are as described above (FIG. 4), and a detailed form of the valve case body 50 to which these are mounted is shown in FIG.
[0046]
As shown in FIG. 5, the valve case main body 50 according to the present invention is penetrated by a plurality of ventilation holes 221, 222 that are penetrated through and are arranged on a double circumference. A plurality of vent holes 231 and 232 arranged on a double circumference, and a valve fixing protrusion 125 and 135 for inserting and fixing the valve body. A hole 57 and a discharge valve insertion fixing hole 58 are provided.
[0047]
In the case of the present embodiment, the ventilation holes for suction (the left part in FIG. 5A) are the same shape (all circular) on the inner circumference (circle C1) and arranged at the same pitch. 221 (eight in the example in the figure) and vent holes 222 (16 in the example in the figure) arranged on the outer circumference (circle C2) with the same shape (all circular) and at the same pitch. Yes. In this case, it is desirable that the hole diameter of the vent hole 221 disposed on the innermost circumference is set larger than the hole diameter of the vent hole 222 disposed on the outermost circumference. This is to prevent the thin circular valve umbrella portion from being deformed so as to be embedded in the air hole, and to improve the durability as a seal valve. Further, it is desirable that the vent holes 221 disposed on the inner side are formed in a positional relationship in which a triangle is formed by this and the two vent holes 222 disposed on the outer side. This is because it is easy to increase the flow rate while maintaining durability.
[0048]
The plurality of vent holes 221 and 222 are preferably formed such that the minimum approach distance between them is 1 mm or more. This is to prevent damage to the valve head as much as possible when the valve head is in close contact. In general, the diameter of the air holes 221 and 222 is desirably 5 mm or less.
[0049]
The discharge vent (the right portion in FIG. 5A) is also set to the same specifications as the suction vent. That is, in the case of the present embodiment, vent holes 231 (eight in the example shown in the figure) arranged on the inner circumference (circle C1 ′) with the same shape (all circular) and at the same pitch, and the outer circumference It consists of vent holes 232 (16 in the example shown in the figure) arranged on the top (circle C2 ′) in the same shape (all circular) and at the same pitch. In this case, it is desirable that the hole diameter of the vent hole 231 arranged on the innermost circumference is set larger than the hole diameter of the vent hole 232 arranged on the outermost circumference. Further, it is desirable that the vent holes 231 arranged on the inner side are formed in a positional relationship in which a triangle is formed by this and the two vent holes 232 arranged on the outer side. Further, it is desirable that the plurality of vent holes 231 and 232 be formed so that a minimum approach distance adjacent to each other is 1 mm or more.
[0050]
In the case of the present embodiment, a plurality of ventilation holes arranged on a double circumference are listed as preferred examples, but other than this, such as arrangement on a triple to quadruple circumference, etc. It may be arranged on multiple circles.
[0051]
FIG. 6 shows an enlarged view of the suction vent (the left portion of FIG. 5A) in FIG. 5A in relation to the valve head portion 121. Making the vent holes 221 and 222 circular has an advantage that processing during manufacture is easy.
[0052]
FIG. 7 shows a modification of FIG. That is, as shown in FIG. 7, the plurality of vent holes 221a (inner circumference) and 222 (outer circumference) arranged on the double circumference form a substantially trapezoidal shape extending outward. Yes. The substantial trapezoidal shape is not a trapezoid in a strict sense, but means that there are some curved portions or rounded corners. By using the trapezoidal shape, there is an advantage that the hole area by the arrangement can be increased and a large flow rate can be easily realized. In this case as well, it is desirable that the vent holes 221a disposed on the inner side are formed in a positional relationship in which a triangle is formed by this and the two vent holes 222a disposed on the outer side.
[0053]
Next, how the intake valve 120 and the discharge valve 130 in the present invention are deformed will be described with reference to FIG.
[0054]
8A, the suction valve 120 and the discharge valve 130 shown in FIG. 4 are inserted into the suction valve insertion fixing hole 57 and the discharge valve insertion fixing hole 58 of the valve case main body 50 shown in FIG. The attached state is shown. In addition, only the inner ventilation holes 221 and 231 are shown in a cross section so that the valve action can be easily understood.
[0055]
When the diaphragm chamber 160 expands to a negative pressure due to the deformation of the diaphragm, the valve body 122 of the suction valve 120 opens and air is sucked into the diaphragm chamber 160 (FIG. 8B). Next, as the diaphragm is deformed in the reverse direction, the diaphragm chamber 160 is compressed to a positive pressure, the discharge valve 130 is opened, and air is discharged from the diaphragm chamber 160 into the discharge chamber (FIG. 8C). The operations shown in FIGS. 8B to 8C are alternately and continuously performed, and the compressed air is continuously discharged.
[0056]
In the present invention, the rubber material used as the suction valve and the discharge valve is not particularly limited. For example, EPDM and silicone rubber are preferable examples. Nitrile rubber, fluorosilicone rubber, hydrin rubber, fluorine rubber, and the like may be used. These are appropriately selected and used depending on the operating temperature and the contact fluid.
[0057]
In addition to the electromagnetic diaphragm pump, the valve structure of the present invention includes a fuel pump valve, a sphygmomanometer exhaust valve, a dashpot delay valve, a fuel tank internal pressure adjustment valve, a well pump air supply valve, and an ink jet printer pump. It can be applied in various fields such as medical transfusion check valves and vending machine valves.
[0058]
【The invention's effect】
The present invention is a valve structure having a plurality of vent holes and a thin circular valve umbrella portion that opens and closes the vent holes, wherein the plurality of vent holes are centered on a central portion of the circular valve umbrella portion. As it is configured to be arranged on multiple circumferences more than double, it is possible to increase the flow rate and reduce costs and space saving by reducing the work man-hours. An extremely excellent effect is exhibited. Noise can be reduced by defining the surface roughness of the flat surface on the seal side of the valve head portion.
[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 shows necessary portions of main parts of the electromagnetic diaphragm pump of the present invention. It is the front view shown with the 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 a cross section.
FIG. 4 is a perspective view showing a typical form of an intake valve and a discharge valve.
FIG. 5 (a) is a front view of a valve case main body provided with a plurality of vent holes, to which a suction valve and a discharge valve for opening and closing the vent holes are attached, and FIG. 5 (b) is a diagram of FIG. It is an AA cross-sectional arrow view of 5 (a).
FIG. 6 is a front view for explaining an arrangement example of a plurality of ventilation holes.
FIG. 7 is a front view for explaining another arrangement example of the plurality of vent holes.
FIGS. 8A to 8C are diagrams for explaining the operation of a suction valve and a discharge valve attached to a valve case main body.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Electromagnetic diaphragm pump 5 ... Lower tank container 7 ... Bottom base plate 10 ... Electromagnet case 11 ... Electromagnet case main body 15 ... Electromagnet case cover body 17 ... Air inlet 21, 25 ... Electromagnet 30 ... Vibrator 40 ... Diaphragm 50 ... Valve case body 60 ... Valve case lid 70 ... Diaphragm electromagnet side center plate 80 ... Diaphragm valve case side center plate 90 ... L-type rubber hose 100 ... Outer casing 120 ... Suction valve 130 ... Discharge valve 150 ... Intake chamber 160 ... Diaphragm chamber 170: Discharge chambers 221, 222, 231, 232 ... Ventilation holes

Claims (4)

A valve structure having a plurality of vent holes, a thin circular valve umbrella portion that opens and closes the vent holes, and a valve fixing protrusion that protrudes from the center of the valve umbrella portion ,
The plurality of vent holes are arranged on a multiple circumference of double or more around a central part of a circular valve head part,
The plurality of air holes arranged on the multiple circumferences are circular or substantially trapezoids extending outward.
Of the plurality of ventilation holes arranged on the multiple circumference, the diameter of the ventilation hole arranged on the innermost circumference is set larger than the diameter of the ventilation hole arranged on the outermost circumference. And
The plurality of air holes arranged on the same circumference are arranged with the same shape and the same pitch,
Among the plurality of ventilation holes arranged on the multiple circumferences, the ventilation holes arranged on the inner side are formed in a positional relationship that forms a triangle with this and two adjacent ventilation holes arranged on the outer side. valve structure characterized in that there. A case-like electromagnet case;
A pair of electromagnets arranged to face each other in the electromagnet case;
A vibrator interposed between the opposing surfaces of the pair of electromagnets and reciprocating in a direction perpendicular to the opposing direction of the electromagnets with a change in polarity of the electromagnets;
A pair of elastic diaphragms disposed so as to face both ends of the vibrator;
An intake valve and a discharge valve that are isolated by the diaphragm and have a plurality of vent holes, a thin circular valve umbrella portion that opens and closes the vent holes, and a valve fixing protrusion that protrudes from the center of the valve umbrella portion. An electromagnetic diaphragm pump having a valve case main body,
The plurality of vent holes are arranged on a multiple circumference of double or more around a central part of a circular valve head part,
The plurality of air holes arranged on the multiple circumferences are circular or substantially trapezoids extending outward.
Of the plurality of ventilation holes arranged on the multiple circumference, the diameter of the ventilation hole arranged on the innermost circumference is set larger than the diameter of the ventilation hole arranged on the outermost circumference. And
The plurality of air holes arranged on the same circumference are arranged with the same shape and the same pitch,
Among the plurality of ventilation holes arranged on the multiple circumferences, the ventilation holes arranged on the inner side are formed in a positional relationship that forms a triangle with this and two adjacent ventilation holes arranged on the outer side. electromagnetic diaphragm pump, characterized in that there.   The electromagnetic diaphragm pump according to claim 2, wherein the plurality of vent holes have a minimum approach distance of 1 mm or more adjacent to each other.   4. The electromagnetic diaphragm pump according to claim 2, wherein the surface roughness Ra of the flat surface on the seal side of the valve head portion is 0.5 to 3.0 μm.

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