KR101477116B1 - Electromagnetic diaphragm pump - Google Patents

Abstract

The present invention provides an electromagnetic diaphragm pump having an electromagnet, a vibrator that vibrates according to a change in polarity of the electromagnet, a diaphragm disposed at an end of the vibrator, and a diaphragm holding portion for pressing and fixing the periphery of the diaphragm, A diaphragm chamber forming concave portion for forming a diaphragm chamber inside the partition wall through the partition wall and an intake chamber forming concave portion and a discharge chamber forming concave portion for forming an intake chamber and a discharge chamber on the outer side thereof through a partition wall A suction valve is mounted on the inside of the partition wall in which the suction chamber forming concave portion is formed and a discharge valve is mounted on the outside of the partition wall where the discharge chamber forming concave portion is formed and the suction chamber forming concave portion and the discharge chamber And a metal valve cover for mute is provided in the recessed portion.

Description

ELECTROMAGNETIC DIAPHRAGM PUMP

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic diaphragm pump for a domestic fuel cell and an electromagnetic diaphragm pump for feeding fuel gas or air such as LPG as a fluid, The present invention relates to an electromagnetic diaphragm pump capable of increasing quietness.

BACKGROUND ART [0002] An electromagnetic diaphragm pump is conventionally known in which an oscillator is vibrated by an electromagnet to displace a diaphragm to suck and discharge a fluid.

In such an electromagnetic diaphragm pump, normally, the diaphragm is assembled to the pump body in a state in which the bead (projection for fixing) formed on the outer peripheral portion is pulled out in the outer peripheral direction.

Among such performance required for the user of an electronic diaphragm pump (particularly, an electromagnetic diaphragm pump of a large flow type requiring a large amount of flow) is one of high importance. Generally, in an electromagnetic diaphragm pump, a check valve having an umbrella (valve umbrella portion) shape composed of an elastic body such as rubber is generally used. However, when the umbrella (valve umbrella portion) of the check valve is opened and closed, the sound is a great factor for increasing the vibration sound.

As a countermeasure against such a noise, the thickness of the outermost metal plate cover is increased. In other words, the voice can be improved by increasing the thickness of the metal plate cover, which is mounted so as to cover the whole area of the surface on which the umbrella is arranged from the outside. However, in order to have a higher crystal clearance, it is necessary to considerably increase the plate thickness of the metal plate cover itself, which causes drawbacks such as an increase in weight and an increase in cost.

In response to such a problem, JP KOKAI Publication No. 2002-371968, for example, discloses an electromagnetic oscillating pump capable of reducing vibration and noise from a pump main body. The pump casing portion is fixed to both side portions of the electromagnetic portion. There has been proposed an electromagnetic oscillating type pump having a double side structure in which a side lid portion made of a thermoplastic resin that is glass fiber for sound insulation is provided and the side lid portion has a cavity formed of an inner lid and an outer lid.

However, if a double structure having a cavity for sound insulation is provided in the direction of the outer peripheral wall (axial direction) of the pump casing, it is necessary to expand the device to the outside, thereby causing a problem that the device itself becomes large. In addition, since the number of parts is increased, a problem arises that the material cost and the assembling cost increase, leading to an increase in cost. In addition, it can be said that it is difficult to reach the level of the object of the present invention by the noise reduction effect only by the combination of the air layer and the resin material.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electromagnetic diaphragm pump which is capable of increasing the positive sound while suppressing an increase in the weight and cost of the apparatus as much as possible.

DISCLOSURE OF INVENTION

In order to solve such a problem, an electromagnetic diaphragm pump of the present invention has an electromagnet, a vibrator that vibrates according to a change in polarity of the electromagnet, a diaphragm disposed at an end of the vibrator, and a diaphragm holding portion for pressing and fixing the periphery of the diaphragm, The diaphragm holding portion includes a partition wall, a diaphragm chamber forming concave portion for forming a diaphragm chamber inside the partition wall through the partition wall, and an intake chamber forming concave portion for forming an intake chamber and a discharge chamber on the outer side thereof through the partition wall. A discharge valve is mounted on the outside of the partition wall where the discharge chamber forming concave portion is formed, and a discharge valve is provided on the outside of the partition wall where the discharge chamber forming concave portion is formed, In the intake chamber forming concave portion and the discharge chamber forming concave portion, Sokje is configured so that the valve cover is installed.

As a preferred mode of the electromagnetic diaphragm pump of the present invention, the intake chamber forming concave portion and the discharge chamber forming concave portion are provided with respective individual metal valves for mute, corresponding to the mounting position and size of the suction valve and the discharge valve, Cover is installed.

As a preferred mode of the electromagnetic diaphragm pump of the present invention, the intake chamber forming concave portion and the discharge chamber forming concave portion are each provided with a protruding rib for mounting a metallic valve cover for mute, And the metal valve cover for silencing is lifted up to a predetermined height from the bottom of the intake chamber forming concave portion and the discharge chamber forming concave portion.

Further, as a preferred embodiment of the electromagnetic diaphragm pump according to the present invention, the projecting rib is provided with an opening for communication for communicating the inner region and the outer region of the rib.

Further, as a preferred embodiment of the electromagnetic diaphragm pump according to the present invention, the opening for communication is constituted such that a plurality of the projecting ribs are divided and provided, and the space between the projecting ribs is used as an opening.

Further, as a preferred embodiment of the electromagnetic diaphragm pump of the present invention, the opening for communication has a configuration in which the protruding rib is formed substantially continuously, a notch is provided from the upper end of the protruding rib, and the notch is used as an opening .

Further, as a preferred embodiment of the electromagnetic diaphragm pump of the present invention, the metal valve cover is configured to have a plate-like portion and a projecting piece projecting in a substantially vertical direction with respect to the plane of the plate-like portion from the end of the plate-

Further, as a preferred embodiment of the electromagnetic diaphragm pump of the present invention, the back surface (outer surface) of the metal valve cover for mute is configured to be pressed directly or indirectly inward by the casing cover by fixing the casing cover.

According to a preferred embodiment of the electromagnetic diaphragm pump of the present invention, the suction valve has a valve umbrella portion and a valve shaft, and the partition wall on which the suction valve is mounted is provided with a fixing hole for fixing the valve shaft, A valve hole is formed in the partition wall on which the valve is mounted, and a valve hole for fixing the valve shaft is formed in the partition wall on which the discharge valve is mounted, and a valve vent hole Is configured to be installed.

The electromagnetic diaphragm pump of the present invention as described above has an extremely excellent effect of increasing the positive voice while suppressing the increase of the weight and cost of the apparatus as much as possible.

1 is a perspective view schematically showing a state in which an electromagnetic diaphragm pump of the present invention is disassembled into individual main parts.
Fig. 2 is a 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 a necessary portion of a main portion of the electromagnetic diaphragm pump according to the present invention in a section.
4 is a perspective view for explaining a main part of the present invention, and is a perspective view mainly showing a part of a main part assembled with the diaphragm holding part as a center.
Fig. 5A is a front view for explaining the main part of the present invention. Fig. 5A is a front view for explaining the main part of the present invention. Fig. 5A is a front view for explaining a main part of the present invention, Fig. 5B is a sectional view of the line (V) - (V) of Fig. 5A. Fig.
Fig. 6A is a front view for explaining a main part of another embodiment of the present invention. Fig. 6A is a front view for explaining a main part of another embodiment of the present invention, Fig. 6B is a sectional view taken along the line VI-VI in Fig. 6A. Fig.
7 is a perspective view for explaining a main part of the present invention.
8 is a perspective view for explaining a main part of another embodiment of the present invention.
FIG. 9A is a front view schematically showing the relationship between the area occupied by the metal valve cover and the area occupied by the valve umbrella portion, and shows a relationship corresponding to the present invention. FIG. 9B is a front view schematically showing the relationship between the area occupied by the metal valve cover and the area occupied by the valve umbrella portion, and shows the relationship when the present invention is not applicable.

(Mode for carrying out the invention)

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

The present invention is not limited to the embodiment described below, and various modifications can be made within the scope of not deviating from the technical idea. Also, in the accompanying drawings, for the sake of explanation, there are cases where the upper, lower, right and left scale is exaggerated, and the scale may differ from the actual scale.

1 is a perspective view schematically showing a state in which the electromagnetic diaphragm pump 1 of the present invention is disassembled into individual main parts. FIG. 2 is a plan view showing a necessary portion of a main portion of the electromagnetic diaphragm pump of the present invention in a section, and FIG. 3 is a side view showing a necessary portion of a main portion of the electromagnetic diaphragm pump of the present invention. FIG. 4 is a perspective view for explaining a main part of the present invention, and is a perspective view mainly showing parts of a main part assembled to the diaphragm holding part with the center as a center. FIG. 5A corresponds to a partial front view after assembling parts of the main part shown in Fig. 4, and corresponds to a substantial installation position and size of the intake valve and the discharge valve in the intake chamber forming concave portion and the discharge chamber forming concave portion And FIG. 5B is a cross-sectional view taken along the line V - V in FIG. 5A. FIG. 5A is a front view showing a state in which a metal valve cover for silencing is hooked on the protruding ribs formed respectively.

1 to 3, an electromagnetic diaphragm pump 1 according to the present invention includes a pair of electromagnets 20 disposed in a body frame 10 and a pair of electromagnets 20 disposed between the opposing faces of the pair of electromagnets 20, A pair of diaphragms 40 disposed at both ends of the vibrator 30, a diaphragm stand 50 for holding and fixing the periphery of the diaphragm and a diaphragm holder 60 ).

1, an upper opening 13 for inserting a pair of electromagnets 20 and the like from above is provided in the main body frame 10 in this embodiment, And a pair of side openings 15 into which the diaphragm stand 50 and the diaphragm holding portion 60 can be mounted inside. In addition, inside the main body frame 10, there are provided a communication path (not shown) communicating with the input connection port 18 (see FIG. 2) for sucking the fluid to be flowed by the pump and an output connection port (Not shown) communicating with the discharge port 19 (see Fig. 2) are formed in different shapes, respectively.

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

The electromagnetic diaphragm pump 1 according to the present invention is configured such that the vibrator 30 is disposed at a substantially right angle to the opposing direction of the electromagnet 20 in accordance with a change in polarity of a pair of electromagnets 20 disposed inside the body frame 10, As shown in Fig. A connecting shaft 31 is fixedly disposed at both ends of the vibrator 30. A pair of opposed diaphragms 40 are arranged and fixed at both ends of the vibrator 30 as described above.

A first center plate 71 and a second center plate 75 are fixed to substantially the center of the diaphragm 40 so as to sandwich the diaphragm 40. The center plates 71 and 75 are provided with substantially the oscillators 30 (Connecting shafts 31 and 31) are fixed.

As described above, the periphery of the diaphragm 40 is sandwiched and fixed by the diaphragm stand 50 and the diaphragm holding portion 60. [ The diaphragm stand 50 and the diaphragm holding section 60 are mounted and fixed in the side openings 15 of the main body frame 10.

1 to 3, the diaphragm 40 has a ring-shaped bead portion 45 projecting inwardly at its periphery, and the diaphragm 40 is provided with a ring- The diaphragm holder 50 is disposed inside the diaphragm 40 and the diaphragm holder 60 is disposed outside the diaphragm 40. [

The diaphragm holding portion 60 located outside the diaphragm 40 has a function as a valve case main body having a valve and pushes the peripheral portion of the diaphragm 40 against the diaphragm stand 50, (80) and the casing cover (85).

The diaphragm holding portion 60 having a function as a valve case main body is attached in a predetermined direction so that the suction valve 120 and the discharge valve 130 perform respective predetermined functions (suction and discharge). This will be described in detail later.

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, a pair of electromagnets 20 opposed to each other have an E-shaped electromagnet core 22 and an electromagnet coil 23 wound on the core 22 And an electromagnet bobbin (24). An unshown AC power source is connected to the coil 23 for the electromagnet of the electromagnet 20 so that a change in the magnetic pole (change in polarity) is generated as many times as the frequency of the AC power source.

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 as described above. 3, the vibrator 30 has a plate body portion 35 and a connecting shaft 31 formed at both ends of the plate body portion 35. The vibrator 30 has a plate body portion 35, Permanent magnets 36 (for example, N poles) and 37 (for example, S poles) having different rectangular polarities from each other are attached, for example.

2, 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 inner side. The suction valve 120 is constituted by a valve member 121 having a thin circular shape and serving as a seal valve and a valve fixing shaft 125 projecting from the central portion of the valve member 121. The valve fixing shaft 125 is mounted and fixed to a fixing hole formed in the partition wall 61 (Fig. 2). Although it is not shown in the drawings, it is preferable that a protruding engaging portion is formed at the distal end of the valve fixing shaft 125 for preventing leakage after fixing. In addition, the plane of the valve umbrella portion 121 on the side where the valve stationary shaft 125 is located constitutes a so-called seal plane (valve).

The valve action of the suction valve 120 causes fluid to flow from the input connector 18 through the valve vent hole 62 formed in the partition wall 61 to the diaphragm chamber 61 . 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). The fluid sucked into the diaphragm chamber 160 flows into the diaphragm chamber 60 through the valve vent hole 61 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 portion 60. [ And enters the discharge chamber 170 through the discharge port 63, and is discharged from the output port 19 via a communication path (not shown).

The shape of the discharge valve 130 itself is basically the same as that of the above-described suction valve 120. The structure of the discharge valve 130 is the same as that of the suction valve 120 shown in Fig. 2 except that a thin circular valve umbrella portion 131 And a valve fixing shaft 135 protruding from a central portion of the valve umbrella portion 131. [ The valve fixing shaft 135 is mounted and fixed to a fixing hole formed in the partition wall 61 (Fig. 2). It is preferable that a protruding engaging portion is formed at the tip end portion of the valve fixing shaft 135 for preventing leakage after fixing. The plane of the valve umbrella portion 131 on the side where the valve fixing shaft 135 is located constitutes a so-called seal plane (valve).

The valve action of the suction valve 120 and the discharge valve 130 will be further described. The oscillator 30 reciprocates in the directions of arrows? And arrows? Shown in FIG. 2 and FIG. 3 at the same frequency as the AC power source in accordance with the change in polarity of the electromagnet 20 connected to the AC power source. The diaphragm 40 disposed at both ends of the vibrator 30 in synchronism with the movement 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. [ As a result, the capacity of the diaphragm chamber 160 is changed. When the diaphragm 40 is deformed in the direction of the arrow alpha, the diaphragm chamber 160 expands and becomes a negative pressure. When the suction valve 120 is opened, The fluid is sucked into the diaphragm chamber 160. On the contrary, when the diaphragm 40 is deformed in the direction of the arrow β, the diaphragm chamber 160 on the (β) direction side is compressed and becomes a static pressure, the discharge valve 130 is opened, To the discharge chamber (170). These operations are alternately performed successively, and the fluid is continuously discharged.

The specific shape 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 umbrella portion 121 (131) It is sufficient to set it appropriately. The same applies to the number of the suction valve 120 and the discharge valve 130 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.

The rubber material constituting the diaphragm 40 is not particularly limited, but fluororesins and NBR, which are excellent in heat resistance and corrosion resistance and excellent in flexibility, are suitable examples.

(Description of main parts of the present invention)

The configuration described above will be described in more detail and the essential parts of the present invention will be described.

2, the diaphragm holding portion 60 includes a partition wall 61 formed substantially parallel to the plane of the diaphragm 40, and a diaphragm chamber 61 disposed inside the partition wall 61 through the partition wall 61. [ A diaphragm chamber forming recess 160 'for forming an intake chamber forming recess 150' for forming an intake chamber 150 and a discharge chamber 170 on the outer side of the diaphragm chamber forming recess 160 ' And a discharge chamber forming concave portion 170 ', respectively. As a suitable embodiment, by covering the intake chamber forming recess 150 'and the discharge chamber forming recess 170' with the casing cover 85 through the casing packing 80, the partitioned intake chamber 150 And a discharge chamber 170 are formed. A partition wall 69 is formed in the substantially central portion of the diaphragm holding portion 60 to partition the intake chamber 150 and the discharge chamber 170. [

As described above, the intake chamber 150 communicates with the input connector 18 (see Fig. 2) via a communication path (not shown). Similarly, the discharge chamber 170 is connected to the output connector 19 (see FIG. 2) via a communication path (not shown).

As shown in Figs. 2, 4 and 5B, in the inside of the partition wall 61 (left direction in Fig. 4) where the intake chamber forming concave portion 150 'is formed, 120 are mounted. The discharge valve 130 is mounted on the outer side of the partition wall 61 in which the discharge chamber forming concave portion 170 'is formed (rightward in FIG. 4) as described above.

The suction chamber 120 and the discharge valve 130 are formed in the intake chamber forming concave portion 150 'and the discharge chamber forming concave portion 170' Valve covers 91 and 95 are provided.

Here, " corresponding to the substantial mounting position and size of the suction valve 120 and the discharge valve 130 " refers to a region in which the suction valve 120 and the discharge valve 130 respectively occupy the partition wall 61 Corresponds generally to the areas occupied by the circular valve umbrella portions 121 and 131 of the suction valve 120 and the discharge valve 130, respectively. Quot; includes both the positional and the magnitude thereof " has a size larger than that occupied by the valve umbrella portions 121 and 131, and is provided at a position including the installation position of the suction valve 120 and the discharge valve 130 It says. Particularly, it is necessary to consider the above-mentioned requirement that a suction valve 120 is provided on one surface of the partition wall 61 and a metal valve cover for silencing is provided on the other surface opposite to the partition wall 61 (For example, see Fig. 5B). In this case, the positional relationship between the intake valve 120 and the metal valve cover 91 is not appropriate, and as shown in Fig. 9B, there is a case where the position is out of order and the inclusion relation can not be maintained. Since the inclusion relation of Fig. 9A can be easily obtained when the discharge valve 130 and the metal valve cover 95 for silencing are provided on the same surface of the partition wall 61 (see Fig. 5B, for example) Is not expected to occur. FIG. 9A is a plan view schematically showing the relationship between the area occupied by the metal valve cover and the area occupied by the valve umbrella portion, and shows a relationship corresponding to the present invention. Fig. 9B is a plan view schematically showing the relationship between the area occupied by the metallic valve cover and the area occupied by the valve umbrella portion, and shows the relationship when the present invention is not applied.

The metal valve covers 91 and 95 for muting may be mounted on a predetermined position with respect to the installation position of the suction valve 120 and the discharge valve 130. [ For example, legs that can be installed upright from the periphery of the metal plate-shaped portion to be the cover are formed integrally into a vertically lowered shape to form metal valve covers 91 and 95, and these are directly mounted on the partition wall 61 You can. However, since the metal part is increased and the structure is complicated, the cost of the metal valve cover itself may increase and the possibility of weight increase may occur. As shown in Figs. 4 to 6, in order to suppress the increase of the cost and the increase of the weight, the intake chamber forming recess 150 'and the discharge chamber forming recess 170' It is preferable to form the protruding ribs 101 and 105 for mounting the protrusions 91 and 95, respectively.

These protruding ribs 101 and 105 are normally formed on the partition wall 61 and are preferably integrally formed (so-called integral molding) when the diaphragm holding portion 60 is molded. The diaphragm holding portion 60 can be formed by, for example, die casting such as aluminum. However, the present invention is not limited to this embodiment, and injection molded resin may be used.

The metal valve covers 91 and 95 for silencing are provided at predetermined heights from the bottoms of the intake chamber forming recess 150 'and the discharge chamber forming recess 170' by the protruding ribs 101 and 105 And is mounted in a lifted state (see, for example, Fig. 5B). The shape of the metallic valve cover itself does not need to be particularly complicated, and a simple and low cost solution can be realized. The required volume can be reduced, and it is difficult to cause a weight increase.

The shape of the protruding ribs 101 and 105 and the metal valve covers 91 and 95 for silencing mounted on these will be described in more detail with reference to Figs. 5A and 5B. Fig.

First, the combination of the protruding rib 101 in the intake chamber forming concave portion 150 'and the metal valve cover 91 for silencing mounted on the protruding rib 101 will be described. A protruding rib 101a and a protruding rib 101b are provided on the partition wall 61 located at the bottom of the intake chamber forming concave portion 150 ' . However, the number of divisions is not limited to two but may be divided into three or more.

These protruding ribs 101a and protruding ribs 101b are formed on one surface of the partition wall 61. These protruding ribs 101a and the protruding ribs 101b are provided on the other surface of the partition wall 61 on the opposite side, And is formed so as to surround the area occupied by the umbrella portion 121 through the partition wall 61. In the illustrated example, the protruded rib 101a having a curved portion with a large radius of curvature and the protruding rib 101b having a curved portion with a small radius of curvature are arranged in a state of having a clearance E (see Figs. 4 and 5A) . When there are a plurality of gaps E, they may be equally spaced or different spacings.

The stepped ribs 101a and the protruding ribs 101b are formed on the inner side of their respective upper end surfaces with their stepped portions 102a and 102b formed along the inner periphery And the outer periphery of the plate-shaped portion 92 of the metal valve cover 91 is hooked on the outer periphery of the valve cover 91. The stepped portion may be provided on the side of the metal valve cover, not on the protruding rib side. However, the stepped portion is not essential, and a latching structure instead of the stepped portion may be used.

The metal valve cover 91 is provided with a plate-like portion 92 that exhibits a substantially mute function and a protruding portion 92 which protrudes from the end portion of the plate- (See FIG. 4), and the protruding piece 93 is preferably configured to be interposed in the gap E between the protruding rib 101a and the protruding rib 101b. The protruding piece 93 is not required. However, by providing the protruding piece 93, the metal valve cover 91 can be mounted at a predetermined position with high reproducibility.

W1 / W2 = 0.5 to 0.9, where W1 is the width of the projecting piece 93, and W2 is the width of the gap E between the projecting rib 101a and the projecting rib 101b as shown in Fig. 7, , And more preferably 0.8 to 0.9.

H1 / h2 = 0.3 to 0.8 where h1 is the projection height from the lower surface of the plate-like portion 92 of the projecting piece 93, and h2 is the projecting height of the projecting rib 101a and the projecting rib 101b , More preferably 0.3 to 0.5.

The value of W1 / W2 and the value of h1 / h2 can be set so as to form an opening that can reliably communicate the inside and the outside of the protruding rib 101a and the protruding rib 101b. It is necessary that the fluid conveyed by the pump can flow inside and outside of the projecting ribs 101a and 101b.

5A and 5B, the combination of the protruded rib 105 in the discharge chamber forming recess 170 'and the metallic valve cover 95 for silencing mounted thereon will be described. A protruding rib 105a and a protruding rib 105b are formed on the partition wall 61 located at the bottom of the discharging chamber forming concave portion 170 ' . However, the number of divisions is not limited to two but may be divided into three or more.

The protruding ribs 105a and the protruding ribs 105b are formed on one surface of the partition wall 61. These are formed in the valve umbrella portion 131 of the discharge valve 130 located on the same surface of the partition wall 61, Is formed so as to surround the region occupied by the semiconductor layer. In the illustrated example, the projecting rib 105a having a curved portion with a large radius of curvature and the projecting rib 105b having a curved portion having a small radius of curvature are arranged with the gap E therebetween (Figs. 4 and 5A) Reference).

The stepped ribs 105a and the protruding ribs 105b are formed on the inner side of the upper end surfaces of the stepped ribs 105a and 105b along the inner periphery thereof with stepped portions 106a and 106b Like portion 96 of the metal valve cover 95 is mounted on the outer periphery of the plate-shaped portion 96 of the metal valve cover 95. In the present embodiment, the metal valve cover 95 includes a plate-like portion 96 that substantially performs a mute function, like the metal valve cover 91 described above, (See Fig. 4), and the protruding piece 97 is provided so as to be interposed in the gap E between the protruding rib 105a and the protruding rib 105b . The protruding piece 97 is not required. However, by providing the protruding piece 97, the metal valve cover 95 can be mounted at a predetermined position with high reproducibility.

As shown in Fig. 7, when the width of the projecting piece 97 is W1, and the width of the gap E between the projecting ribs 105a and the projecting ribs 105b is W2, the relationship W1 / It seems to be the same. When the projecting height of the projecting piece 97 from the lower surface of the plate-like portion 96 is h1 and the projecting height of the projecting rib 105a and the projecting rib 105b is h2, the relationship of h1 / It seems to be the same.

The material of the metal valve covers 91, 95 described above is not particularly limited as long as it is a metal, but preferably a metal such as iron is used.

The plate thicknesses of the plate-like portions 92 and 96 are preferably as thick as possible in order to increase the noise effect. However, they are in balance with weight and cost, and are usually about 0.5 to 2.0 mm, preferably about 1.0 to 2.0 mm do.

Next, a main part of another embodiment of the present invention will be described with reference to Fig. 6A is a front view for explaining a main part of another embodiment of the present invention. The intake chamber forming recess 150 'and the discharging chamber forming recess 170' Fig. 6B is a cross-sectional view taken along line VI-VI in Fig. 6A. Fig. 6B is a cross-sectional view taken along the line VI-VI in Fig. 6A.

6A and 6B is different from the embodiment shown in Figs. 5A and 5B described above in that, as the protruding rib 101, for example, two projecting ribs 101a, And the protruding ribs 101b are provided so as to traverse one circle by the combination thereof and the plate-like portion 92 of the metallic valve cover 91 mounted on these protruding ribs It is in a circular shape. The protruding ribs 105 having protruding ribs 105a and protruding ribs 105b and the metallic valve cover 95 mounted thereon have the same structure. The protruding pieces 93 and 97 as shown in Fig. 5 are provided on the metal valve covers 91 and 95 of the embodiment shown in Figs. 6A and 6B, and the protruding pieces 93 and 97 of the metal valve covers 91 and 95 It may be made to function as rotation prevention.

8, the projecting ribs 101 (105) are formed substantially continuously without being divided, and the notches 109 are formed from the upper ends of the projecting ribs 101 (105) And may be used as an opening for allowing the fluid for conveying the notch 109 to flow therethrough.

1, reference numeral 201 denotes a frame packing, reference numeral 202 denotes a frame cover, reference numeral 211 denotes a tank packing, reference numeral 212 denotes a tank cover, reference numeral 220 denotes an anti-vibration rubber, reference numeral 230 denotes a bracket, Reference numeral 245 denotes a diaphragm protective sheet.

Hereinafter, the present invention will be described in more detail with reference to specific examples.

(Example 1)

As shown in Figs. 1 to 5, the metal valve covers 91 and 95 for mute, which are the main constituent parts of the present invention, respectively have an intake chamber forming concave portion 150 'and a discharge chamber forming concave portion 170' An electronic diaphragm pump was fabricated (Example 1 sample).

The metal valve covers 91 and 95 are made of a metal made of iron and the plate thicknesses of the plate-like portions 92 and 96 are set to 2.0 mm, respectively. The weight of the metal valve covers 91 and 95 was 14 g.

(Comparative Example 1)

In the above-described sample of Example 1, the metal valve covers 91 and 95 for mute were peeled off (not used).

Except for the above, an electronic diaphragm pump of Comparative Example 1 was produced in the same manner as the sample of Example 1 (Comparative Example 1 sample).

(Comparative Example 2)

In the sample of Example 1, the metal valve covers 91 and 95 for mute were peeled off and not used (not mounted).

Instead, the weight corresponding to the total weight of the metal valve covers 91 and 95 for mute is added to the casing cover 85 (made of metal made of iron) to increase its thickness. The increment of the thickness of the casing cover 85 was about 10%.

Except for this, an electronic diaphragm pump of Comparative Example 2 was produced in the same manner as the sample of Example 1 (Comparative Example 2 sample).

(Comparative Example 3)

An electromagnetic diaphragm pump having a structure similar to that of the electromagnetic vibrating pump described in JP-A-2002-371968 was produced. That is, the pump casing portion fixed to both side portions of the electromagnet portion is provided with a side lid portion made of a thermoplastic resin as glass fiber for sound insulation, and the side lid portion is constituted by a double structure having a cavity formed of an inner lid and an outer lid.

Except for the above, the electromagnetic diaphragm pump of Comparative Example 3 was fabricated in substantially the same manner as the sample of Example 1 (Comparative Example 3 sample).

<Voice test>

The positive test of the sample of Example 1 and the samples of Comparative Examples 1 to 3 was carried out in the following manner. (1) Example 1 and Comparative Example 1, (2) Example 1 and Comparative Example 2, and (3) Four samples of the sample of Example 1 and the samples of Comparative Examples 1 to 3, (2), (3), (4), (5) and (6) A test was conducted to compare the voice. Chung Min Seong was a sensory test of three judges.

As a result, the quietness of Example 1 was remarkably excellent. Next, Comparative Example 2, Comparative Example 1, and Comparative Example 3 were in the order of good positive sound.

From the above results, the effect of the present invention is clear. That is, the electromagnetic diaphragm pump of the present invention has an electromagnet, a vibrator that vibrates according to a change in polarity of the electromagnet, a diaphragm disposed at an end of the vibrator, and a diaphragm holding portion for pressing and fixing the periphery of the diaphragm, A diaphragm chamber forming concave portion for forming a diaphragm chamber inside the diaphragm chamber through the partition wall, an intake chamber forming concave portion and a discharge chamber forming concave portion for forming an intake chamber and a discharge chamber on the outer side thereof through the partition wall And a discharge valve is mounted on the outside of the partition wall where the discharge chamber forming concave portion is formed, and a discharge valve is provided on the inside of the partition wall where the suction chamber forming concave portion is formed, And the discharging chamber forming concave portion are provided with individual metal valve covers for muting A very excellent effect that the positive voice can be increased while suppressing the increase of the weight and the cost of the apparatus to the utmost is maximized.

INDUSTRIAL APPLICABILITY The present invention can be applied to the fields of an electronic diaphragm pump for a home fuel cell, an electronic diaphragm pump for feeding fuel gas such as LPG or the like as a fluid, and an air diaphragm pump for transporting fluid.

Claims (9)

An electromagnetic diaphragm pump comprising: an electromagnet; a vibrator that vibrates according to a change in the polarity of the electromagnet; a diaphragm disposed at an end of the vibrator; and a diaphragm holding portion for pressing and fixing the periphery of the diaphragm,
The diaphragm holding portion includes a partition wall, a diaphragm chamber forming concave portion for forming a diaphragm chamber inside the partition wall through the partition wall, and an intake chamber forming concave portion for forming an intake chamber and a discharge chamber on the outer side thereof through the partition wall. And a discharge chamber forming concave portion, respectively,
A suction valve is mounted on the inside of the partition wall where the intake chamber forming concave portion is formed and a discharge valve is mounted on the outside of the partition wall where the discharge chamber forming concave portion is formed,
Wherein a metal-made valve cover is provided for the intake chamber forming concave portion and the discharge chamber forming concave portion. The air conditioner according to claim 1, wherein the intake chamber forming recess and the discharge chamber forming recess are provided with individual metal valve covers for muting corresponding to the installation position and size of the intake valve and the discharge valve, respectively An electromagnetic diaphragm pump. The intake valve according to claim 1, wherein the intake chamber forming concave portion and the discharge chamber forming concave portion are respectively provided with projecting ribs for mounting a metal valve cover for mute,
And the metal valve cover for silencing is lifted up to a predetermined height from the bottom of the intake chamber forming concave portion and the discharge chamber forming concave portion by the protruding ribs. 4. The electromagnetic diaphragm pump according to claim 3, wherein the protruding rib has an opening for communicating an inner region and an outer region of the rib. 5. The electromagnetic diaphragm pump according to claim 4, wherein the openings for communication are provided by dividing the projecting ribs into a plurality of openings, and the formation gap is used as the openings. 5. The electromagnetic diaphragm pump according to claim 4, wherein the communication opening is formed by continuously forming the protruding ribs, a notch is provided from the upper end of the protruding rib, and the notch is used as the opening. The electromagnetic diaphragm pump according to claim 1, wherein the metal valve cover has a plate-like portion and a protruding piece projecting in a direction perpendicular to the plane of the plate-like portion from the end of the plate-shaped portion. The electromagnetic diaphragm pump according to claim 1, wherein the back surface (outer surface) of the metal valve cover for mute is pressed inward by the casing cover by fixing the casing cover. The valve apparatus according to claim 1, wherein the suction valve has a valve umbrella portion and a valve shaft, and a partition wall for mounting the suction valve is provided with a fixing hole for fixing the valve shaft and a valve vent hole disposed around the valve shaft However,
Wherein the discharge valve has a valve umbrella portion and a valve shaft, and a partition wall on which the discharge valve is mounted is provided with a fixing hole for fixing the valve shaft and a valve vent hole disposed around the valve shaft. Pump.

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