JP5536495B2 - Waterproof structure of alarm speaker - Google Patents

Description

  The present invention relates to a waterproof structure for an alarm speaker that prevents water from entering from the speaker sound emitting portion of a case in a gas leak alarm for a bathroom, for example.

  FIG. 7 shows one form of a waterproof structure of a conventional electronic device (see Patent Document 1).

  In this structure, a rectangular annular packing storage groove 62 is provided on the periphery of a rectangular upper case 61 for mounting an antenna, and a rubber-made rectangular packing 63 is mounted in the packing storage groove 62 so that the opening of the upper case 61 is opened. A lower peripheral wall 65 is formed upright at the periphery of the bottom plate 64 that closes the bottom, and two protruding strips 66 having a triangular cross section are provided around the pressing surface at the tip of the peripheral wall 65, and the back surface of the packing 63 is pressed by each protruding strip 66. Thus, entry of water from the case peripheral edge 67 into the case is prevented.

  As a waterproof structure other than the above, in Patent Document 2 (not shown), as an opening / closing panel for a marine acoustic device, a rectangular cross-section packing is disposed on the front surface of the box-shaped cover, and the box-shaped cover is attached to the box-shaped cover. Around the back of the operation panel that can be opened and closed by a hinge, a semi-circular rib on the tip is provided around it, and fine irregularities are formed to prevent the sticking of the packing, and the rib is used as a packing when the operation panel is closed. It is described that the intrusion of water into the cover was prevented.

Japanese Patent Laying-Open No. 2006-203127 (FIG. 5) JP 2006-216133 A (FIG. 3)

  However, when each of the above conventional waterproof structures is applied to a waterproof structure for an alarm speaker, the contact position between the packing 63 and the ridge 66 or rib when the bottom plate 64 or the like is closed is the packing width direction (arrow A direction). In addition, when the packing 63 contracts or expands due to a temperature change or the like and the thickness varies, the adhesion with the ridges 66 and the ribs is lowered, which may adversely affect the waterproof property. There was a concern. In addition, when the two ridges 66 are pressed against the packing 63, there is a concern that the packing portion between the two ridges 66 may be distorted and the adhesion of the pressing surface 63a may be lowered.

  In the present invention, in view of the above points, the position of the packing with respect to the pressing rib is difficult to shift in the width direction, and when the packing contracts / expands due to a temperature change or the like, the adhesion with the pressing rib decreases. It is an object of the present invention to provide a waterproof structure for a speaker for an alarm device, which is difficult to perform and can eliminate the influence of the distortion of the pressing surface caused by the two pressing ribs (projections).

In order to achieve the above object, a waterproof structure for an alarm speaker according to claim 1 of the present invention has a cylindrical wall provided on the inner surface of a case body so as to communicate with the outside. seating surface is formed one step lower, ribs Ichijo is projected in a circular ring shape the seat surface, with an annular peripheral wall from the annular wall and the annular wall protruding radially outer peripheral side protrudes in the axial direction of the speaker sectional flat packing circular annular inner side of the flange portion is arranged comprising, upon mounting of the speaker, a separate holding plate is fixed to the fixed portion of the outside of the tubular wall, presser plate the collar portion is formed in a substantially annular shape along the of the annular wall, in a state where the collar portion in the pressing plate is pressed toward the ribs together with the packing, the rib is characterized in that bite into the packing.

  With the above configuration, the ribs bite into a surface (pressing surface) orthogonal to the outer peripheral surface of the packing while the outer peripheral surface of the packing is in contact (contact) with the inner surface of the peripheral wall of the flange of the speaker. The position is precisely defined in the width direction, and a reliable waterproof seal is exhibited. The packing is pressed against the rib by the holding plate, the rib bites into the packing, and the state is maintained by the holding plate, so that when the packing contracts or expands due to temperature change etc., the adhesion between the rib and the packing is improved. It is maintained well and a reliable waterproof seal is exhibited. Moreover, since the rib is one, when the rib bites into the pressing surface of the packing, distortion of the pressing surface is suppressed to be small, and a reliable waterproof sealing property is exhibited.

The waterproof structure for a speaker for an alarm device according to claim 2, wherein a cylindrical wall is provided on the inner surface of the case main body so as to communicate with the outside, and a circular annular seating surface is formed on the inner side of the tip of the cylindrical wall. A rib is protruded in a circular ring shape, and a circular ring-shaped packing having a flat cross section is disposed in a flange portion having a ring-shaped peripheral wall of the speaker , and is fixed to a fixing portion outside the cylindrical wall when the speaker is mounted. and the collar portion in the pressing plate is pressed toward the ribs together with the packing, the ribs bite into the surface of the packing, said surface is being located with a gap between the seat surface.

  With the above configuration, a stable waterproof sealing performance is exhibited only on contact (adhesion) between the rib and the packing on the pressing surface of the packing against the seating surface of the cylindrical wall without being affected by the distortion of the pressing surface.

  The waterproof structure of the alarm speaker according to claim 3 is the waterproof structure of the speaker for alarm according to claim 1 or 2, wherein the tip of the rib is formed in a semicircular cross section.

  With the above-described configuration, the leading end of the rib and the packing are smoothly pressed, and the packing is not damaged or damaged by the leading end of the rib.

  The waterproof structure of the alarm speaker according to claim 4 is the waterproof structure of the alarm speaker according to any one of claims 1 to 3, wherein an outer peripheral edge of the diaphragm is in close contact with the flange portion, and the outer peripheral edge is The packing is in close contact.

  With the above configuration, the speaker is primarily waterproofed by the diaphragm and secondarily waterproofed by the packing, and good sealing performance is exhibited by the synergistic action of the diaphragm and the packing. The ribs press the packing against the surface of the outer peripheral edge of the diaphragm in the thickness direction, and the packing presses the back surface of the outer peripheral edge of the diaphragm against the buttocks of the speaker.

  According to the first aspect of the present invention, the packing is bitten into the rib while being positioned on the peripheral wall of the flange portion of the speaker, thereby preventing the displacement of the packing in the width direction with respect to the rib and exhibiting a good waterproof sealing property. Can be made. Also, by pressing the packing against the rib with the pressing plate at all times, when the packing shrinks or expands due to temperature changes, etc., the adhesiveness between the rib and the packing is maintained well, and a reliable waterproof sealing performance is exhibited. Can do. In addition, with a single circular annular rib, distortion of the pressing surface of the packing can be suppressed to be small, and a reliable waterproof sealing property can be exhibited.

  According to the second aspect of the present invention, on the pressing surface of the packing against the seat surface of the cylindrical wall, the packing shrinkage due to temperature change or the like is not affected by the distortion of the pressing surface, but only by the close contact between the rib and the packing. Regardless of expansion, a stable waterproof seal can be exhibited.

  According to the third aspect of the present invention, the end of the rib and the packing are smoothly pressed to prevent the packing from being damaged or damaged by the end of the rib, and a good waterproof sealing property is exhibited over time. Can be made.

  According to invention of Claim 4, waterproofing can be improved by a synergistic action with a diaphragm by pressing against the outer periphery of a diaphragm, pressing a packing with a rib in the thickness direction.

It is a rear view which shows the internal structure of one Embodiment of the case main body of the alarm device applied to the waterproof structure of the speaker for alarm devices which concerns on this invention. It is a perspective view which similarly shows the cylinder wall which is the principal part of a case main body. It is a perspective view which shows the state which attached the speaker to the cylinder wall of the case main body, and was fixed with the pressing board. It is sectional drawing which shows the structure inside FIG. It is sectional drawing which decomposes | disassembles and shows the structure of FIG. It is sectional drawing which shows one form of the contact | adherence structure of a rib and packing. It is sectional drawing which shows one form of the waterproof structure of the conventional electronic device.

  1 to 5 show an embodiment of a waterproof structure for an alarm speaker according to the present invention.

  FIG. 1 is a rear view showing a synthetic resin case main body 1 (with a bottom plate not shown) removed from a bathroom gas leak alarm device. The case main body 1 includes a vertical front wall 2 and upper, lower, left and right peripheral walls 3. Are formed in a vertically long rectangular shape, a circular ring-shaped tubular wall 4 for sound emission as a speaker fixing portion and a columnar light guide portion 5 for alarm display or the like on the back surface of the front wall 2 (substitute with reference numeral 2). A column 6 for vertically fixing an electronic circuit board (not shown) with a tap screw, a frame wall 7 for accommodating a battery part of the circuit board, and an operation button for pressing a switch on the circuit board 8 and upper and lower horizontal partition walls 9 for reinforcement.

  The support column 6, the frame wall 7, and the light guide unit 5 protrude in the horizontal direction from the back surface of the front wall 2, the partition wall 9 protrudes at about half of the height, and the sound emitting cylinder wall 4 further extends from the partition wall 9. It protrudes low. A plurality of vertical slits 10, 11 are provided in parallel in the case front wall 2 a inside the cylindrical wall 4 and the case front wall 2 b inside the frame wall 7. Space communicates with the outside. A thin speaker 12 (FIG. 3) with waterproof packing, which will be described later, is mounted on the cylindrical wall 4, and a battery unit (not shown) or a gas leak detection sensor (sensor integrated type) not shown in the frame wall 7. Is housed. The sensor is connected to the circuit board by a connector or the like via a lead wire or the like.

  The slit 11 in the frame wall 7 is waterproofed by waterproof means (not shown). A circumferential groove 13 for packing is provided at the tip of the peripheral wall 3 of the case body 1, and a bottom plate portion (not shown) is in close contact with a rectangular annular packing (not shown) in the circumferential groove 13 to be waterproofed. . The case body 1 and the bottom plate portion form a rectangular box-like case. A fixing bracket 14 is provided on the upper portion (upper wall) of the case body 1. In the present embodiment, water that has entered through the slit 10 in the cylinder wall 4 of the gas leak alarm mounted in the bathroom is blocked by the packing 15 (FIG. 4) in front of the speaker 12 (FIG. 3). Or intrusion into the case body 1 behind the speaker.

  FIG. 2 is an enlarged view of the cylindrical wall 4 of the case body 1, and a circular annular seating surface 17 that is one step lower than the stepped surface 16 is provided on the inner side of the cylindrical wall 4 via a circular annular stepped surface 16. The seating surface 17 is formed orthogonally and continues perpendicularly to the inner peripheral surface 18 of the cylindrical wall 4, and is used for pressing a circular annular packing at the substantially center of the seating surface 17 (more precisely, closer to the inner surface 18 of the cylindrical wall 4). The rib 19 is provided integrally. The width and height of the rib 19 are considerably smaller than the width of the seating surface 17 and the height of the stepped surface 16 as shown in FIG. 4. For example, the width and height are 0.5 mm and 0.25 mm. The tip of the rib 19 is formed in a semicircular cross section as shown in FIG. 6 to be described later, and the packing 15 is prevented from being damaged by the tip of the rib 19.

  As shown in FIG. 2, three fixed portions 20 are integrally provided on the outer peripheral surface of the cylindrical wall 4, and the fixed portions 20 are substantially cylindrical and have the same height as the cylindrical wall 4. The surface 20 a is located on the same plane as the distal end surface 21 on the outer side of the cylindrical wall 4, and a small hole 20 b into which a tap screw is screwed is provided at the center of the fixing portion 20. An arcuate guide wall 22 having an inner surface 22 a that is flush with the step surface 16 is erected on the tip surface 21 of the cylindrical wall 4. The guide wall 22 is useful for smoothly and surely inserting a speaker 12 described later along the guide inner surface 22a and above the inner seat surface 17. In FIG. 2, reference numeral 2 a denotes the back surface of the front wall 2, 10 denotes a slit, 6 denotes a column portion that is a circuit board fixing portion, and 9 denotes a reinforcing partition wall.

FIG. 3 shows a state in which the speaker 12 is attached to the tube wall 4, the speaker holding plate 23 is attached from above the speaker 12, and the speaker 12 is fixed to the fixing portion 20 with the tap screw 24. As shown in FIG. 4, the pressing plate 23 presses the flange portion 26 on the outside of the speaker 12 against the flat annular packing 15, and the packing 15 is pressed into the rib portion 19 while being pressed inside the flange portion 26 of the speaker 12. To do.

  As shown in FIG. 3, the pressing plate 23 is formed in an incomplete ring shape with a circular part cut out, the guide wall 22 is positioned in the cutout portion 27, and a semicircle is formed at the center and both ends in the circumferential direction of the pressing plate 23. The flange portion 25 is integrally formed, and the flange portion 25 has a tap screw insertion hole. The inner diameter of the pressing plate 23 is slightly larger than the outer diameter of the inner projecting wall 28 at the rear portion of the speaker 12, and the outer diameter of the pressing plate 23 is slightly larger than the outer diameter of the cylindrical wall 4.

  The speaker 12 is a thin drip-proof speaker, and is a metal disk portion (yoke or back plate) 29 composed of an outer circular ring-shaped flange portion 26 and a circular projecting wall 28 that integrally extends inside the flange portion 26. (FIG. 4). 3 to 4 show the speaker 12 in a simplified manner. As shown in FIG. 4, the flange portion 26 has a flat circular annular wall 26 a on the rear side (upper side in FIG. 4) that is parallel to the seating surface 17 of the cylindrical wall 4, and faces forward on the outer peripheral side of the annular wall 26 a ( And a short circular ring-shaped peripheral wall 26b that is orthogonal to (downward). In the embodiment of the specification, “front” means the front wall 2 side of the case body 1.

  The rear surface of the annular wall 26 a is a flat seat surface, and is pressed against the inner surface (front surface) of the pressing plate 23. The rear surface of the elastic packing 15 is brought into close contact with the inner surface (front surface) of the annular wall 26a via the synthetic resin diaphragm 30 (not shown in FIG. 4) shown in FIG. 5, and the inner surface of the peripheral wall 26b. The outer peripheral surface of the packing 15 is in close contact, the outer peripheral surface of the peripheral wall 26b is in contact with the stepped surface 16 of the cylindrical wall 4 with a slight gap, and the inner peripheral surface of the packing 15 is in contact with the annular protrusion 31 of the diaphragm 30 in FIG. Yes. The diaphragm 30 is harder and more flexible than the elastic packing 15.

  The outer diameter of the packing 15 is formed to be the same as or slightly larger than the inner diameter of the peripheral wall 26b of the flange portion 26, and is in close contact with the inner peripheral surface of the peripheral wall 26b in a free state and is pressed by the rib 19 in the axial direction. The packing 15 elastically and strongly adheres to the inner surface of the peripheral wall 26b in an attempt to expand in the radial direction within the flange portion 26. The position of the packing 15 relative to the pressing rib 19 is accurately regulated by the peripheral wall 26b so as not to shift in the width direction.

  Further, the packing 15 is pressed in the thickness direction together with the flange portion 26 by the pressing plate 23 and is compressed at least at the contact portion with the rib 19, so that when the packing 15 contracts and expands in the thickness direction due to a temperature change or the like, the pressing is performed. The adhesiveness with the ribs 19 for use is less likely to decrease. Since the pressing plate 23 presses the packing 15 toward the rib 19 in the thickness direction with uniform force in the circumferential direction by the three fixing portions 20, the annular packing 15 and the rib 19 are in close contact with each other in the circumferential direction.

  As shown in FIGS. 4 and 5, the packing 15 is mounted on the cylindrical wall 4 together with the speaker 12 in a state in which the packing 15 is mounted on the speaker 12 in advance (it is preferable to be lightly fixed to the diaphragm 30 with an adhesive or the like). Installed. The packing 15 is made of black synthetic rubber as a material and has a flat rectangular cross section, and is formed in a circular ring shape along the seating surface 17 of the cylindrical wall 4. The rib 19 bites into and comes into close contact with the center in the width direction of the front surface of the packing 15 (the lower surface in FIG. 4), and the front surface of the packing 15 in the example of FIG.

  In the bathroom, water droplets enter the inside of the cylindrical wall 4 from the sound emitting slit 10, and in particular, the rib 19 bites into the front surface of the packing 15, so that the adhesion of the packing 15 is increased and water into the case main body 1 is increased. Intrusion is reliably prevented. Since the metal pressing plate 23 is protected from water droplets and corrosion of the pressing plate 23 is prevented, the pressing plate 23 can be reused when disassembled after the alarm test is completed, for example.

  As shown in the example of FIG. 6, only the ribs 19 may be in close contact with the packing 15, and the seat surface 17 of the cylindrical wall 4 and the front surface 15 a of the packing 15 may be separated by a slight gap 32. By using one rib 19 (one strip), the front surface 15a of the packing 15 is less distorted than when two ribs are used, and the front surface 15a of the packing 15 is connected to the cylindrical wall 4 as in the example of FIG. When it is brought into close contact with the seating surface 17, adhesion, that is, waterproofness is enhanced.

  As shown in the example of FIG. 6, when the gap 32 is opened, the front surface 15 a of the packing 15 and the seat surface 17 of the cylindrical wall 4 are lightly in close contact with each other when the packing 15 expands in the thickness direction due to a thermal effect or the like. When the waterproof property is improved and the shrinkage in the thickness direction, the gap 32 is slightly enlarged while the adhesion between the rib 19 and the packing 15 is maintained, and the rib 19 is completely affected by the distortion of the packing front surface 15a. Absent.

  As shown in FIG. 5, a magnet 33 and a surrounding voice coil 34 are arranged in the center of the disk portion (yoke) 29 of the speaker 12, and both ends of the voice coil 34 are connected to two lead wires 35 and led out. The lead wire 35 is connected to the connector of the circuit board by a connector (not shown), and the peripheral wall of the disc-shaped diaphragm 30 made of synthetic resin without holes is formed on the annular wall 26a of the flange portion 26 of the disk portion 29. The rear surface of the portion (outer peripheral edge) 36 is closely contacted and fixed with an adhesive or the like, and the outer peripheral end 36 a of the diaphragm 30 is closely contacted with the inner surface of the peripheral wall 26 b of the flange 26, and the flange 36 of the diaphragm 30 The outer surface 15b of the packing 15 is in close contact with the inner surface of the peripheral wall 26b of the flange 26.

An inclined projection 31 is provided around the radially inner side of the flange portion 36 of the diaphragm 30, and a groove 37 for packing attachment is formed between the projection 31 and the peripheral wall 26 b. Although the protrusion 31 is lower than the peripheral wall 26 b , the outer surface 15 b of the annular packing 15 contacts the inner surface of the peripheral wall 26 b over the entire circumference, so that the positioning of the packing 15 is accurately performed and the radially inner side of the packing 15. Is prevented from being displaced in the width direction.

  The packing 15 of this example slightly protrudes forward from the front end 26c of the peripheral wall 26b, and has a crushing allowance for the seat surface 17 of the cylindrical wall 4. When the rib 19 is bitten into the packing 15, the inner peripheral surface 15 c of the packing 15 is in close contact with the inclined surface 31 a of the protrusion 31 of the diaphragm 30, and the rear surface of the packing 15 is in close contact with the annular wall 26 a of the flange portion 26. The outer peripheral surface 15b of the packing 15 is in close contact with the peripheral wall 26b. The diaphragm 30 having no hole itself acts as a sealing member, and the intrusion of water into the speaker 12 is surely prevented by the cooperative action in combination with the packing 15. 5, reference numeral 2 denotes a front wall of the case body 1, 10 denotes a slit, 19 denotes a rib, 23 denotes a pressing plate, 38 denotes a tap screw insertion hole of the pressing plate 23, and 20 denotes a fixing portion.

  The waterproof structure of the alarm speaker according to the present invention reliably prevents water from entering, for example, the alarm speaker (buzzer sound or sound) of a gas leak alarm for bathrooms or the case behind the speaker. Can be used. In addition to the gas leak alarm, it can be applied to a CO alarm, a high temperature alarm, and the like.

DESCRIPTION OF SYMBOLS 1 Case main body 4 Cylinder wall 12 Speaker 15 Packing 15a Front (surface)
17 Seating surface 19 Rib 20 Fixing part 23 Presser plate 26 Gutter part 26b Peripheral wall 30 Diaphragm 32 Gap 36 Gutter part (outer peripheral edge)

Claims (4)

A cylindrical wall is provided on the inner surface of the case main body so as to communicate with the outside, a circular annular seating surface is formed one step lower on the inner side of the tip of the cylindrical wall, and a single rib is provided on the seating surface so as to project in a circular annular shape. is disposed sectional flat packing circular ring from the outer circumference protrudes radially annular wall and the annular wall on the inner side of the flange portion composed of a peripheral wall of the annular projecting in the axial direction of, when mounting of the speaker are separate holding plate fixed to the fixed portion of the outside of the tubular wall, presser plate is formed in a substantially annular shape along the annular wall of the collar portion, the collar portion with the pressing plate together with the gasket A waterproof structure for a speaker for an alarm device , wherein the rib bites into the packing while being pressed against the rib . A cylindrical wall is provided on the inner surface of the case main body so as to communicate with the outside, a circular annular seating surface is formed one step lower on the inner side of the tip of the cylindrical wall, and a single rib is provided on the seating surface so as to project in a circular annular shape. A circular annular and flat cross-section packing is disposed in a flange portion having an annular peripheral wall, and the flange portion and the packing are fixed to the outer fixed portion of the cylindrical wall when the speaker is mounted. to be pressed against, the ribs bite into the surface of the packing, said surface is waterproof structure for alarm dexterity speaker you being located with a gap between the seat surface.   The waterproof structure for a speaker for an alarm device according to claim 1 or 2, wherein a tip of the rib is formed in a semicircular cross section.   The waterproof structure for a speaker for an alarm device according to any one of claims 1 to 3, wherein an outer peripheral edge of the diaphragm is in close contact with the flange, and the packing is in close contact with the outer peripheral edge.

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