JP6050088B2 - Electromagnetic diaphragm pump - Google Patents

Description

  The present invention relates to, for example, an electromagnetic diaphragm pump for household fuel cells, an electromagnetic diaphragm pump for pressure-feeding fuel gas such as LPG, and in particular, when fluid leaks into the pump due to damage to the diaphragm, etc. The isolation structure prevents the fluid from entering the current-carrying part through which electricity flows, so that the isolation action by this isolation structure is surely expressed to prevent the occurrence of accidents due to leakage, and the performance of the electromagnetic pump is degraded. The present invention relates to an electromagnetic diaphragm pump that can suppress noise.

  Conventionally, as shown in the schematic plan sectional view of FIG. 6, the electromagnet 500 vibrates the vibrator 510 in the vertical direction of the drawing to displace the diaphragm 520, and sucks and discharges (discharges) the fluid to be transported. ) Electromagnetic diaphragm pumps are known.

  In such an electromagnetic diaphragm pump, normally, a pair of opposing diaphragms 520 are disposed at both ends of the vibrator 510, and a pair of electromagnets 500 are spaced apart from each other by a predetermined distance. It is arranged along the side surface of the vibrator 510 in a state. An AC power supply (not shown) is connected to the electromagnet coil of the electromagnet 500, and the magnetic pole changes (polarity changes) the same number of times as the frequency of the AC power supply occurs, and is connected to the AC power supply. The vibrator 510 is configured to reciprocate at the same frequency as the AC power supply in accordance with the change in polarity of the electromagnet 500.

  The diaphragms 520 disposed at both ends of the vibrator 510 in synchronism with the reciprocating motion of the vibrator 510 are deformed by the same displacement amount as the stroke of the vibrator 510 around the center of the diaphragm. As a result, the capacity of the diaphragm chamber 530 changes, and the operation of sucking and discharging fluid, that is, the pump operation, is performed via the suction valve 535 and the discharge valve 536 which are check valves.

  In such an electromagnetic diaphragm pump, when the object to be transported is combustible gas, for example, the combustible gas needs to be completely shut out from the electromagnet 500 having a portion through which electricity flows. Therefore, in order to isolate the electromagnet 500 and the vibrator 510 in the conventional die-cast part shown in FIG. 6, a partition cylindrical portion 550 surrounding the vibrator 510 is formed, and the flammable gas is pumped by any chance due to damage to the diaphragm 520 or the like. Even if it leaks into the interior, a structure is adopted in which the leaked combustible gas does not flow from the interior 550a of the partition cylindrical portion 550 surrounding the vibrator 510 to the electromagnet 500 connected to the AC power source. Has been.

  However, as shown in FIG. 6, for example, when the partition cylindrical portion 550 surrounding the vibrator 510 and the pump body are integrally manufactured by aluminum die casting, the hollow interior of the partition cylindrical portion 550 is formed. It is necessary to mount a pair of inner core members (not shown). Then, the pair of inner core members (not shown) is provided with a pair of inner core members (not shown) arranged opposite to each other while providing a post-molding taper 600. It is necessary to make a butt structure at the position of the line G.

  Furthermore, an external line H of the partition tubular portion 550 is also formed on a core member (not shown) disposed in the portion to form a space for placing the electromagnet 500 outside the partition tubular portion 550. The drawing taper along the depth direction of the drawing sheet is required.

  Thus, by providing the draft taper 600 on the inner surface of the partition cylindrical part 550 and by providing the draft taper along the back surface direction of the outer line H of the partition cylindrical part 550, the partition cylindrical part 550 The thickness distribution of the surface facing the surface of the electromagnet 500 arranged opposite to the surface is not constant, and there are a thick portion and a thin portion, and the line H is inclined in the depth direction on the paper surface. For these reasons, since the gap with the electromagnet 500 cannot be narrowed, the performance decreases due to the widening of the gap between the electromagnets, that is, the force applied to the vibrator 510 from the electromagnet 500 cannot be increased. Further, when a so-called cast nest caused by generation of bubbles or the like occurs when trying to respond as thinly as possible in a place where the thickness distribution by the punch taper 600 is not constant, The communication hole may be partially formed in the wall portion of the portion 550, and there is a possibility that the combustible gas may flow into the electromagnet 500 side.

  Further, when burrs are generated on the abutting surface (location of the line G) when the partition cylindrical portion 550 is formed, a great amount of man-hours are required for the subsequent deburring operation.

  Japanese Patent Application Laid-Open No. 2006-169988 is a prior art which is different from the subject of the present application but is considered to have a configuration similar to that of the present application.

JP 2006-169988 A

  In the cited Japanese Patent Application Laid-Open No. 2006-169988, the heat generated by passing an electric current through the coil portion of the electromagnet is transmitted to the diaphragm via the vibrator or directly, and the diaphragm is heated, so that the diaphragm is heated to a high temperature. It was proposed to solve the problem that it was not possible to extend the life due to thermal degradation due to thermal degradation, and the mover (30) and the diaphragm (40) were arranged inside the case (20), and the case (20 The configuration in which the electromagnet part (50) is arranged outside the) is adopted. For this reason, the mover storage part (21) of the case (20) serves as a partition, cuts off the heat energy generated in the electromagnet part (50), and can prevent the diaphragm (40) from being heated and deteriorated. It is said that the life of the diaphragm (40) can be extended.

  The case (20) provided with such a mover storage part (21) is composed of a nonconductive member such as a nonconductive plastic. Even in this case, the above-described taper is necessary for the sake of molding, The thickness distribution of the surface facing the opposite electromagnet surface is not constant, there will always be a thick part and a thin part, and as mentioned above, the gap between the electromagnets becomes wide and the pump performance decreases. In addition, problems such as the occurrence of burrs from the abutting surface inside the partition cylindrical portion have not been solved. The numbers in the parentheses are the numbers attached to the drawings used in Patent Document 1.

  The present invention has been devised under such circumstances, and its purpose is, for example, when the fluid leaks into the pump due to a diaphragm breakage, etc. An electromagnetic structure that has an isolation structure that cannot enter the site, and that can reliably prevent the occurrence of accidents and the like due to leakage by reliably expressing the isolation action by this isolation structure, and can suppress the deterioration of the performance of the electromagnetic pump It is in providing a type diaphragm pump.

In order to solve such problems, an electromagnetic diaphragm pump according to the present invention includes an electromagnet, a vibrator that vibrates with a change in polarity of the electromagnet, a diaphragm disposed at an end of the vibrator, and a peripheral portion of the diaphragm. A diaphragm base and a diaphragm holding portion that can be sandwiched and fixed, and a vibrator cover that covers the vibrator, and a pair of diaphragms inside the diaphragm by the pair of diaphragm base and the pair of diaphragms. A chamber cover is formed and a vibrator cover separate from the diaphragm base is attached so that the pair of inner compartments communicate with each other. An opening for passing the end portion of the vibrator, and an outer peripheral portion of the opening. Have a, a housing part for housing with the transducer cover, when viewed in vertical cross-section to the longitudinal direction connecting the pair of the diaphragm base, a pair of side plate portions which are arranged so as to face the electromagnet And a connecting plate portion for connecting the side plate portions, and the side plate portion is configured to have a uniform thickness .

  Moreover, as a preferable aspect of the electromagnetic diaphragm pump of the present invention, both ends of the vibrator cover are fixedly configured to a pair of opposing diaphragm bases so as to maintain airtightness at the joint portion.

Moreover, as a preferable aspect of the electromagnetic diaphragm pump of the present invention, the storage portion includes a packing mounting surface on which a vibrator cover packing formed on the outer peripheral portion of the opening is mounted, and an outer periphery of the packing mounting surface. And a rib body that is a member that guides and fits the end portion of the vibrator cover.

As a preferred embodiment of the electromagnetic diaphragm pump of the present invention, the vibrator cover is made of a nonmagnetic material.

  As a preferred embodiment of the electromagnetic diaphragm pump of the present invention, the nonmagnetic material is made of aluminum or an aluminum alloy.

As a preferred aspect of the electromagnetic diaphragm pump of the present invention, the rib body serving as a member that guides and fits the end portion of the vibrator cover includes a notch portion in which a part of the convex portion of the closed loop is notched. The vibrator cover packing includes a closed loop seal part and a protrusion part protruding outward from the seal part, and the protrusion part of the vibrator cover packing is fitted into the notch part of the rib body. Composed.

  Further, as a preferred aspect of the electromagnetic diaphragm pump of the present invention, the diaphragm holding portion disposed outside the diaphragm has a function as a valve case body including a valve, and is configured to have an intake valve and a discharge valve. The

  Moreover, as a preferable aspect of the electromagnetic diaphragm pump of the present invention, each of the suction valve and the discharge valve includes a thin circular valve umbrella portion and a valve fixing shaft that protrudes from the central portion of the valve umbrella portion. Configured as follows.

Further, as a preferred aspect of the electromagnetic diaphragm pump of the present invention, the valve case body includes a valve mounting hole portion and a partition wall in which a communication hole for suction or discharge is formed, and the valve fixing shaft is a valve mounting hole. is inserted in section, the valve umbrella portion of the thin circular shape really becomes so constructed off valve function of the vent communicating hole.

  The electromagnetic diaphragm pump of the present invention includes an electromagnet, a vibrator that vibrates as the polarity of the electromagnet changes, a diaphragm disposed at an end of the vibrator, and a diaphragm that can be fixed by sandwiching the peripheral edge of the diaphragm A pair of diaphragm chambers are formed inside the diaphragm by the pair of diaphragm bases and the pair of diaphragms, and the pair of diaphragm chambers. Since the vibrator cover separate from the diaphragm base is attached so as to communicate with each other, for example, when the fluid leaks into the pump due to the breakage of the diaphragm or the like, the leaked fluid Isolation structure that prevents entry of electricity into the current-carrying part can be formed, and the isolation action by this isolation structure is reliably expressed. The occurrence of accidents due to leakage Te can be prevented. Furthermore, since the thickness of the separate vibrator cover can be made uniform, it is possible to suppress the performance degradation of the electromagnetic pump.

FIG. 1 is a perspective view schematically showing a state in which the electromagnetic diaphragm pump of the present invention is disassembled into individual main parts. FIG. 2 is a plan view showing a necessary portion of a main part of the electromagnetic diaphragm pump of the present invention in cross section. FIG. 3 is a front view showing a cross section taken along line II-II in FIG. 2 and is a drawing showing necessary portions of the main part of the electromagnetic diaphragm pump of the present invention. FIG. 4A is a cross-sectional view showing the vicinity of a joint portion between the diaphragm base and the vibrator cover, and is a plan view (cross-sectional view) taken along line AA in FIG. FIG. 4B is a cross-sectional view showing the vicinity of the joint portion between the diaphragm base and the vibrator cover, and is a plan view (cross-sectional view) taken along line BB in FIG. 4C. 4C is a drawing for explaining a cutting position (cross-sectional position) in FIGS. 4A and 4B, and is a cross-sectional view corresponding to FIG. FIG. 5 is a schematic perspective view for explaining a situation where the diaphragm base and the vibrator cover are assembled via the vibrator cover packing. FIG. 6 is a plan sectional view showing an example of the structure of a conventional electromagnetic diaphragm pump.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
In addition, this invention is not limited to the form demonstrated below, In the range which does not deviate from a technical thought, it can implement in various deformation | transformation. In the accompanying drawings, the vertical and horizontal scales may be exaggerated for the sake of explanation, and the actual scales may differ.

  FIG. 1 is a perspective view schematically showing a state in which the electromagnetic diaphragm pump of the present invention is disassembled into individual main parts, and FIG. 2 is a cross-sectional view of a necessary portion of the main part of the electromagnetic diaphragm pump of the present invention. FIG. 3 is a front view showing a necessary portion of the main part of the electromagnetic diaphragm pump of the present invention in a section taken along line II-II in FIG. 2, and the electromagnetic diaphragm of the present invention. It is drawing which showed the required location of the principal part of a pump.

  FIG. 4A is a cross-sectional view showing the vicinity of the joint portion between the diaphragm base and the vibrator cover, and is a plan view (cross-sectional view) taken along line AA in FIG. FIG. 4B is a cross-sectional view showing the vicinity of the joint portion between the diaphragm base and the vibrator cover, and is a plan view (cross-sectional view) taken along line BB in FIG. 4C. 4C is a drawing for explaining the cutting positions in FIGS. 4A and 4B, and is a cross-sectional view corresponding to FIG. FIG. 5 is a schematic perspective view for explaining a situation where the diaphragm base and the vibrator cover are assembled via the vibrator cover packing.

  As shown in FIG. 1, the electromagnetic diaphragm pump 1 of the present invention includes a pair of electromagnets 20 disposed in a main body frame 10, and a vibrator 30 interposed between opposing surfaces of the pair of electromagnets 20. The diaphragm 30 includes a pair of diaphragms 40, and a diaphragm base 50 and a diaphragm holding part 60 that can sandwich and fix the (peripheral) peripheral edge of the diaphragm 40. ing. Furthermore, the present invention includes a substantially cylindrical vibrator cover 100 that covers the vibrator 30 with a certain gap. That is, the pair of diaphragm bases 50 and the pair of diaphragms 40 are formed so that a pair of inner chambers 165 (see FIG. 2) are opposed to positions inside the position of the diaphragm 40. The vibrator cover 100 is attached so that the inner compartment 165 communicates.

  Such a vibrator cover 100 is not formed integrally with the diaphragm base 50 but is formed as a separate member.

  As shown in FIG. 1, the main body frame 10 is not limited to the illustrated embodiment, but in the present embodiment, an upper opening 13 for inserting the electromagnet 20 and the like from above, a vibration It has a pair of side openings 15 into which the child 30 or the like can be inserted and into which the diaphragm base 50 and the diaphragm holding portion 60 can be attached. Further, inside the main body frame 10, a communication path (not shown) that communicates with an input connection port 18 that sucks a fluid that is a flow target carried by the pump and an output connection port 19 that discharges fluid are communicated. Communicating passages (not shown) are formed in different forms.

The configuration of the present invention will be described in more detail.
In the electromagnetic diaphragm pump 1 of the present invention, for example, the vibrator 30 reciprocates in a substantially perpendicular direction with respect to the direction in which the electromagnets 20 face each other as the polarity of the pair of electromagnets 20 disposed inside the body frame 10 changes. It is configured to be able to. For example, the coupling shaft 31 (see FIGS. 1 and 2) is fixedly disposed at both ends of the vibrator 30, and a pair of opposing diaphragms 40 are disposed at both ends of the vibrator 30 as described above.・ It is fixed.

  As shown in FIG. 1, a first center plate 71 and a second center plate 75 are fixed so as to sandwich the diaphragm 40 at a substantially central portion located on the inner peripheral portion of the diaphragm 40. The vibrator 30 (the connecting shafts 31, 31) is substantially fixed to the combined center plates 71, 75.

  As described above, the peripheral edge of the diaphragm 40 is sandwiched and fixed by the diaphragm base 50 and the diaphragm holding part 60. Further, the diaphragm base 50 and the diaphragm holding part 60 are configured to be mounted and fixed in the side opening 15 of the main body frame 10. More specifically, in the embodiment shown in FIG. 2, the diaphragm 40 includes, for example, a ring-shaped bead portion 45 projecting inward at the peripheral edge portion thereof, and the diaphragm base 50 is arranged on the inner side of the diaphragm 40. The diaphragm holding part 60 is configured to be located outside the diaphragm 40.

  As shown in FIG. 1 and FIG. 2, the diaphragm holding portion 60 located outside the diaphragm 40 has a function as a valve case main body provided with a valve, and presses the peripheral portion of the diaphragm 40 so as to press the casing packing 80. The casing cover 85 and the side surface of the main body frame 10 are fixed together.

  In this way, the suction valve 120 and the discharge valve 130 are attached to the diaphragm holding part 60 having a function as a valve case main body in a predetermined direction so as to perform respective predetermined functions (intake and discharge). This will be described in detail later.

  With reference to FIGS. 2 and 3, the basic structure of the electromagnetic diaphragm pump 1 of the present invention will be described in more detail.

  As shown in FIG. 2, one or both of the electromagnets 20 arranged to face each other have, for example, an E-type electromagnet core 22 and an electromagnet bobbin 24 around which an electromagnet coil 23 is wound. Configured. A lead wire 25 (see FIG. 1) connected to the AC power source is connected to the electromagnet coil 23 of the electromagnet 20, and the magnetic pole changes (polarity changes) are generated the same number of times as the frequency of the AC power source. ing.

  As described above, the vibrator 30 that reciprocates with the change in the polarity of the electromagnet 20 is inserted in the gap between the opposing surfaces of the pair of electromagnets 20 so as not to contact the electromagnet 20. In the case of the present embodiment, the vibrator 30 has a plate main body portion 35 and connecting shafts 31 formed at both ends thereof as shown in FIG. 2, and the plate main body portion 35 is not shown. However, for example, square-shaped permanent magnets having different polarities are attached.

<Description of the essential structure in the present invention>
In the present invention, as described above, the vibrator cover 100 is provided so as to cover the vibrator 30 with a certain gap. The shape of the cross section perpendicular to the longitudinal direction of the vibrator cover 100 is, for example, a deformed rectangular ring shape with rounded corners as shown in FIG. 3, but is not limited to this shape. The shape can be appropriately selected according to the shape of the cross section, the shape of the electromagnet disposed on both sides, and the like. In the present invention, such a vibrator cover 100 is composed of a member separate from the diaphragm base 50. In the present invention, the separate body is not determined based on whether or not the vibrator cover 100 and the diaphragm base 50 are made of the same material, and whether or not both members are separated in advance. It is judged by. The integrally molded product is not a separate structure.

  As described above, the pair of diaphragm bases 50 and the pair of diaphragms 40 form a pair of inner chambers 165 at positions inside the position of the diaphragm 40, and the pair of inner chambers 165 are communicated with each other. The vibrator cover 100 according to the invention is attached (see FIG. 2). Both ends of the vibrator cover 100 are fixed to the diaphragm base 50 via, for example, a vibrator cover packing 155 so as to maintain the airtightness at the joint portion with the pair of diaphragm bases 50 facing each other.

As described above, the diaphragm base 50 joined to the vibrator cover 100 includes a sandwiching base 51 that serves to sandwich the peripheral edge of the diaphragm 40, an opening 53 that allows the end portion of the vibrator 30 to pass through, and the opening 53. And a housing portion that houses the end portion of the vibrator cover 100 together with the vibrator cover packing 155.

  As shown in FIGS. 2 and 5, such a storage unit includes a packing mounting surface 53 a on which the vibrator cover packing formed on the outer peripheral portion of the opening 53 is mounted, and the packing mounting surface 53 a. A rib body 55a that protrudes from the outer peripheral portion and serves as a guide / fitting member when the end of the vibrator cover 100 is inserted is configured. The rib body 55a may be formed of a closed loop continuous convex portion, but in the present invention, as a preferred embodiment, the rib body 55a is configured to include a cutout portion 55b in which a part of the closed loop convex portion is cut out. . The vibrator cover packing 155 is formed so as to correspond to the structure of the rib body 55a. That is, as shown in FIG. 5, the vibrator cover packing 155 that is mounted substantially inside the rib body 55a and placed on the packing placement surface 53a is housed inside the rib body 55a. A closed-loop seal portion 155a, and a protrusion 155b formed to protrude outward at a substantially central position of the seal portion 155a. And this protrusion part 155b is comprised so that it may fit in the notch part 55b used as the space | interval of the rib body 55a.

  Since the embodiment of the present invention has such special cutout portions 55b and protrusions 155b, the cross-sections at two cutout positions of lines AA and BB in FIG. Is shown as a plan view of FIGS. 4 (A) and 4 (B). 4A is a cross-sectional view at the position of the notch 55b where the rib body 55a does not exist, so that the end of the vibrator cover 100 is in contact with the diaphragm base 50 via the vibrator cover packing 155. The rib body 55a as a cross section drawn with diagonal lines does not exist. Further, since the vibrator cover packing 155 at the position of FIG. 4A is a portion where the protrusion 155b exists, the cross-sectional width of the packing is wide as shown in FIG. 4B (FIG. 4B). In comparison). On the other hand, FIG. 4B is a cross-sectional view at a location where the rib body 55a exists (a position where the notch 55b does not exist), and therefore there is a rib body 55a as a cross-section drawn with diagonal lines. doing. Further, since the protrusion 155b does not exist in the vibrator cover packing 155 at this position, the cross-sectional width of the packing is narrow, which is a normal width as shown in the drawing (in comparison with FIG. 4A). ).

  In addition, the vibrator cover 100 according to the present invention is preferably configured so that the thickness uniformity and smoothness are excellent particularly on the surface facing the electromagnet. That is, as shown in FIG. 3 and FIG. 5, the vibrator cover 100 includes a pair of side plate portions 101 disposed so as to face the electromagnets and their sides when viewed in a cross section perpendicular to the longitudinal direction. It is a series of structures (substantially cylindrical bodies) including a connecting plate portion 102 for connecting the face plate portion 101, and the side plate portion 101 is configured to have a uniform thickness. The uniform wall thickness referred to in the present invention refers to a uniform level that is incapable of recognizing the existence of a conventionally intended draft taper (draft slope).

  By providing such thickness accuracy, a uniform thin side plate 101 can be formed, and it is possible to prevent performance degradation of the electromagnetic pump.

  The cylindrical vibrator cover 100 having a uniform thickness as described above can be formed by drawing. Drawing is a method of processing a material by drawing it through a narrow hole in a die at room temperature without heating the material. In general, an extruded material is often used as a material to be drawn, but the extruded material does not necessarily have to be an initial base.

  Further, the vibrator cover 100 may be formed by extrusion instead of drawing. Extrusion is a method in which aluminum or an aluminum alloy is extruded at a temperature of 400 to 500 ° C., for example. In general, a cylindrical metal block (billet) is extruded from a die hole having various shapes by applying a strong pressure using an extruder to form an elongated extruded material.

  The vibrator cover 100 is made of a nonmagnetic material such as aluminum or an aluminum alloy. Further, a description of the configuration of the electromagnetic diaphragm pump will be added.

  As shown in FIG. 2, the concave portion of the diaphragm holding portion 60 fixed in the side opening 15 (see FIG. 1) of the main body frame 10 and the casing cover 85 formed through the casing packing 80, A partitioned intake chamber 150 is formed. The intake chamber 150 communicates with the input connection port 18 via a communication path (not shown). In substantially the same manner, as shown in FIG. 2, a diaphragm holding portion 60 fixed to the side opening 15 (see FIG. 1) of the main body frame 10, and a casing cover 85 formed via the casing packing 80 Thus, a partitioned discharge chamber 170 is formed. The discharge chamber 170 communicates with the output connection port 19 via a communication path (not shown). The intake chamber 150 and the discharge chamber 170 are partitioned by a partition wall 69.

  A suction valve 120 is attached from the inside to the partition wall 61 of the diaphragm holding part 60 that partitions the suction chamber 150 as shown in the figure. The intake valve 120 includes a thin circular valve umbrella portion 121 that functions as a seal valve, and a valve fixing shaft 125 that protrudes from the central portion of the valve umbrella portion 121. The valve fixing shaft 125 is mounted and fixed in a fixing hole formed in the partition wall 61 (FIG. 2). Although not shown in the drawings, it is usually desirable to form a protrusion-like locking portion at the distal end portion of the valve fixing shaft 125 for preventing it from coming off after fixing. In addition, the plane on the side where the valve fixing shaft 125 of the valve head part 121 is located constitutes a so-called (valve) seal plane.

  Due to the valve action of the suction valve 120 as described above, the fluid flowing from the input connection port 18 is sucked into the diaphragm chamber 160 through the valve vent 62 formed in the partition wall 61 as shown in FIG. The diaphragm chamber 160 is substantially partitioned by the diaphragm 40 and the inner surface of the diaphragm holding unit 60 (particularly the partition wall 61). The fluid sucked into the diaphragm chamber 160 passes through the valve vent hole 63 formed in the partition wall 61 by the valve action of the discharge valve 130 attached from the outside to the partition wall 61 of the diaphragm holding unit 60. And is discharged from the output connection port 19 via a communication path (not shown).

  The form of the discharge valve 130 is basically the same as that of the above-described suction valve 120. As shown in FIG. 2, the configuration of the discharge valve 130 is a thin-circular shaped valve umbrella 131 that functions as a seal valve, and the valve umbrella part. A valve fixing shaft 135 protruding from the center of 131 is provided. The valve fixing shaft 135 is mounted and fixed in a fixing hole formed in the partition wall 61 (FIG. 2). In general, it is desirable to form a protrusion-like locking portion for preventing the valve fixing shaft 135 from coming off after fixing. The plane on the side where the valve fixing shaft 135 of the valve head portion 131 is located constitutes a so-called (valve) seal plane.

  The valve action of the intake valve 120 and the discharge valve 130 will be further described. As the polarity of the electromagnet 20 connected to the AC power supply changes, the vibrator 30 reciprocates in the directions of arrows (α) and (β) shown in FIG. 2 at the same frequency as the AC power supply. 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 (β) direction side in FIG. 2, when the diaphragm 40 is deformed in the arrow (α) direction, the diaphragm chamber 160 expands and becomes negative. When the pressure is reached, the suction valve 120 is opened and fluid is sucked into the diaphragm chamber 160. Conversely, 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 a positive pressure, the discharge valve 130 is opened, and the fluid is discharged from the diaphragm chamber 160 into the discharge chamber 170. Discharged. These operations are performed alternately and continuously, and fluid is continuously discharged.

  In the present invention, even if fluid (for example, combustible gas) flows into the internal compartment 165 (see FIG. 2) inside the pump due to damage to the diaphragm 40 or the like, the pair of internal compartments 165 Since the vibrator cover 100 communicates while maintaining airtightness, fluid cannot flow into the electromagnet side to which the power source is connected.

  The specific forms of the suction 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 head part 121 (131), are appropriately set according to the specifications of the electromagnetic diaphragm pump. You just have to do it. The same applies to the number of intake valves 120 and discharge valves 130 used. There is no particular limitation on the rubber material constituting the intake valve 120 and the discharge valve 130. For example, EPDM and silicone rubber are preferable examples.

  Further, the rubber material constituting the diaphragm 40 is not particularly limited, but preferred examples include fluororubber and NBR which are excellent in heat resistance and corrosion resistance and excellent in flexibility.

  Further, in FIG. 1, reference numeral 201 is a frame packing, reference numeral 202 is a frame cover, reference numeral 211 is a tank packing, reference numeral 212 is a tank cover, reference numeral 220 is an anti-vibration rubber, reference numeral 230 is a bracket, reference numeral 241 , 245 denotes a diaphragm protection sheet.

  In the electromagnetic diaphragm pump of the present invention described above, a pair of inner chambers are formed inside the diaphragm by the pair of diaphragm bases and the pair of diaphragms so that the pair of inner chambers communicate with each other. Since the vibrator cover separate from the base is attached, for example, when fluid leaks into the pump due to diaphragm breakage, etc., the leaked fluid enters the current-carrying part where electricity flows. An isolation configuration that cannot be performed can be formed, and the isolation effect of this isolation configuration can be reliably expressed to prevent an accident or the like due to leakage. Furthermore, since the thickness of the separate vibrator cover can be made uniform, it is possible to suppress the performance degradation of the electromagnetic pump.

  INDUSTRIAL APPLICABILITY The present invention can be used in the field of apparatus technology related to fluid transportation, such as an electromagnetic diaphragm pump for household fuel cells, an electromagnetic diaphragm pump for pumping fuel gas such as LPG as a fluid, and air.

DESCRIPTION OF SYMBOLS 1 ... Electromagnetic diaphragm pump 10 ... Main body frame 15 ... Side opening 20 ... Electromagnet 30 ... Vibrator 45 ... Bead part 40 ... Diaphragm 50 ... Diaphragm base 53 ... Opening 53a ... Packing mounting surface 55a ... Rib body 55b ... Notch 60: Diaphragm holder 100: Vibrator cover 155: Vibrator cover packing

Claims (9)

An electromagnet, a vibrator that vibrates with a change in polarity of the electromagnet, a diaphragm disposed at an end of the vibrator, a diaphragm base and a diaphragm holding section that can be fixed by sandwiching a peripheral edge of the diaphragm, and the vibration Having a vibrator cover covering the child,
The pair of diaphragm bases and the pair of diaphragms form a pair of inner compartments inside the diaphragm, and a vibrator cover separate from the diaphragm base is formed so that the pair of inner compartments communicate with each other. Attached,
The diaphragm base is formed on a sandwiching base that acts to sandwich the peripheral edge of the diaphragm, an opening that allows the end of the vibrator to pass through, and an outer periphery of the opening, and vibrates the end of the vibrator cover. possess a storage unit that housed with child cover packing, the,
The vibrator cover includes a pair of side plate portions disposed so as to face the electromagnet when viewed in a cross section perpendicular to the longitudinal direction connecting the pair of diaphragm bases, and a connecting plate that connects these side plate portions. parts is a series of structures comprising a side plate portion is configured to have a uniform thickness electromagnetic diaphragm pump according to claim Rukoto.   2. The electromagnetic diaphragm pump according to claim 1, wherein both end portions of the vibrator cover are fixed to a pair of opposed diaphragm bases so as to maintain airtightness at a joint portion. The storage portion projects from a packing placement surface on which the vibrator cover packing formed on the outer peripheral portion of the opening is placed, and an outer peripheral portion of the packing placement surface, and guides an end portion of the vibrator cover. The electromagnetic diaphragm pump according to claim 1, further comprising a rib body serving as a member to be fitted . The electromagnetic diaphragm pump according to any one of claims 1 to 3 , wherein the vibrator cover is made of a nonmagnetic material. The electromagnetic diaphragm pump according to claim 4 , wherein the nonmagnetic material is aluminum or an aluminum alloy. The rib body, which is a member that guides and fits the end of the vibrator cover, includes a cutout portion in which a part of the convex portion of the closed loop is cut out,
4. The vibrator cover packing includes a closed loop seal portion and a protrusion protruding outward from the seal portion, and the protrusion of the vibrator cover packing is fitted into the notch of the rib body. The electromagnetic diaphragm pump according to claim 5 . The diaphragm holding part arrange | positioned on the outer side of the said diaphragm has a function as a valve case main body provided with a valve, The electromagnetic diaphragm pump in any one of Claim 1 thru | or 6 which has a suction valve and a discharge valve. 8. The electromagnetic diaphragm pump according to claim 7 , wherein each of the suction valve and the discharge valve includes a thin circular valve umbrella portion and a valve fixing shaft protruding from a central portion of the valve umbrella portion. The valve case body, the valve attachment hole, and the suction or passage for discharging provided with a partition wall is formed, the valve fixing shaft is inserted into the valve mounting hole portion, the thin circular valve umbrella portion The electromagnetic diaphragm pump according to claim 8 , which functions as an on-off valve for venting the communication hole.

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