Explosion-proof buzzer

Abstract

We provide explosion-proof buzzers that can produce stable sound. [Solution] The device comprises a plate-shaped vibrating part 2 that emits sound by vibrating when an electric current is applied, the vibrating part 2 having different polarities for the electric current on the inside and outside in the radial direction, a fixed contact part 3 for applying the electric current to the outer radial portion 21 of the vibrating part 2, an expandable / contractable contact part 4 for applying the electric current to the inner radial portion 22 of the vibrating part 2, the expandable / contractable contact part 4 that expands and contracts in the thickness direction to follow the vibrating part 2, an intervening part 5 interposed between the vibrating part 2 and the fixed contact part 3, and an explosion-proof container 6 that holds each of the vibrating part 2, the fixed contact part 3, the expandable / contractable contact part 4, and the intervening part 5, wherein the intervening part 5 is made of a conductor, is ring-shaped, has a wavy shape in the circumferential direction when viewed from the radial direction, and has a ring portion 50 that generates a biasing force when compressed in the axial direction.

Description

Technical Field

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[0001] The present invention relates to an explosion-proof buzzer with excellent explosion-proof performance.

Background Art

[0002] As an explosion-proof buzzer, for example, there is one described in Non-Patent Document 1. The explosion-proof buzzer described in Non-Patent Document 1 includes a substantially cylindrical main body, a terminal box provided on one side in the axial direction of the main body, and a cover provided on the other end side in the axial direction of the main body.

Prior Art Documents

Patent Documents

[0003]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, with the above configuration, it is difficult to cope with variations in the arrangement of components such as diaphragms provided in the main body, and a new configuration has been desired to achieve stable sound emission.

[0005] An object of the present invention is to provide an explosion-proof buzzer capable of stable sound emission.

Means for Solving the Problems

[0007] With this configuration, when assembling the explosion-proof buzzer, the gap between the vibrating part and the fixed contact part can be appropriately adjusted by the intervening part that generates an axial biasing force, thereby stabilizing the vibration of the vibrating part and, as a result, enabling stable sound production.

[0008] Furthermore, in the explosion-proof buzzer, the intervening portion may be constructed by stacking multiple ring portions in the thickness direction.

[0009] With this configuration, the biasing force in the axial direction can be adjusted by changing the number of stacked ring sections.

[0010] Furthermore, in the explosion-proof buzzer, a wave washer for preventing loosening of a screw-fastened member may be used as the ring portion.

[0011] With this configuration, component costs can be reduced by using readily available wave washers as the ring portion. [Effects of the Invention]

[0012] Based on the above, the present invention provides an explosion-proof buzzer that can produce a stable sound. [Brief explanation of the drawing]

[0013] [Figure 1] Figure 1 is a front view of the explosion-proof buzzer according to this embodiment. [Figure 2] Figure 2 is an exploded perspective view of the explosion-proof buzzer. [Figure 3] Figure 3 is a longitudinal cross-sectional view of the explosion-proof buzzer. [Figure 4] Figure 4 is an enlarged view of the area enclosed by IV in Figure 3. [Modes for carrying out the invention]

[0014] The embodiments of the present invention will be described below with reference to Figures 1 to 4. Explosion-proof buzzer 1 is an explosion-proof buzzer having explosion-proof performance.

[0015] As shown in Figures 1 to 3, the explosion-proof buzzer 1 comprises a plate-shaped vibrating part 2, a fixed contact part 3, an extendable contact part 4, an intervening part 5 interposed between the vibrating part 2 and the fixed contact part 3, and an explosion-proof container 6. The explosion-proof buzzer 1 also comprises a diaphragm unit U1 having the vibrating part 2, a drive unit U2 that vibrates the vibrating part 2, and a contact unit U3 having the fixed contact part 3 and the extendable contact part 4.

[0016] The explosion-proof container 6 is a cylindrical container that houses each unit U1, U2, U3, etc. (Figure 1). The explosion-proof container 6 also holds the vibrating part 2, the fixed contact part 3, the expandable contact part 4, and the intervening part 5 (Figure 2). In this embodiment, the explosion-proof container 6 comprises a container body 60, a cap 61, and a container base 62. Furthermore, the explosion-proof container 6 is equipped with a diaphragm holder 63.

[0017] In the following description, "inner and outer direction" refers to the inner and outer directions of the explosion-proof container 6. Furthermore, "axial direction" refers to the cylindrical axis direction of the explosion-proof container 6, which is perpendicular to the radial and circumferential directions of the explosion-proof container 6. Also, one side in the axial direction (the left side in Figure 3) is the tip side, and the other side in the axial direction (the right side in Figure 3) is the base side.

[0018] The container body 60 is a cylindrical body that covers each unit U1, U2, and U3 from the radially outer side. For example, the container body 60 includes a large-diameter cylindrical portion 600, an annular plate portion 601 disposed on the distal end side of the large-diameter cylindrical portion 600, and a small-diameter cylindrical portion 602 extending from the inner edge of the plate portion 601 to the distal end side (FIG. 2).

[0019] Both the large-diameter cylindrical portion 600 and the small-diameter cylindrical portion 602 are cylindrical. The outer diameter of the small-diameter cylindrical portion 602 is smaller than the outer diameter of the large-diameter cylindrical portion 600.

[0020] The cap 61 is annular and, in this embodiment, is circular. Also, the cap 61 is provided on the distal end side of the container body 60. The cap 61 includes a cap body 610, a connecting portion 611 that connects the cap body 610 to the small-diameter cylindrical portion 602, and spacers 612 and 613. The cap 61 is externally fitted to the small-diameter cylindrical portion 602 of the container body 60 (FIG. 3).

[0021] The cap body 610 includes a cap cylindrical portion 614 and a cap cover plate 615.

[0022] The cap cylindrical portion 614 is cylindrical and covers the distal end portion of the small-diameter cylindrical portion 602 from the radially outer side. Also, the cap cylindrical portion 614 covers the diaphragm holder 63 from the radially outer side.

[0023] The cap cover plate 615 is an annular plate shape and extends radially inward from the distal end edge of the cap cylindrical portion 6 more.

[0024] The connecting portion 611 is substantially cylindrical and is externally fitted to the central portion in the axial direction of the small-diameter cylindrical portion 602 of the container body 60. Also, the connecting portion 611 is disposed on the proximal end side of the cap cylindrical portion 614.

[0025] Spacer 612 is cylindrical and is sandwiched between the cap body 610 (in this embodiment, the cap cover plate 615) and the diaphragm holder 63. Spacer 613 is cylindrical and is fitted onto the base end of the small diameter cylindrical portion 602 of the container body 60. That is, spacer 613 is located on the base end side of the connecting portion 611.

[0026] The container base 62 is substantially cylindrical with its base end closed. The container base 62 is also provided on the base end side of the container body 60. In this embodiment, the container base 62 supports the drive unit U2. The container base 62 also comprises an outer portion 620, an inner portion 621, and a bottom portion 623 that covers the inner portion 621 from the radially outer side and the base end side.

[0027] The outer portion 620 comprises a cylindrical outer tube portion 624 and an annular plate portion 625 that closes the base end of the outer portion 620.

[0028] The inner portion 621 comprises a cylindrical inner tube portion 626, an annular plate portion 627 that closes the base end of the inner tube portion 626, a cylindrical extension tube portion 628 that extends from the inner edge of the plate portion 627 toward the base end, and a closing portion 629 that closes the base end of the extension tube portion 628.

[0029] The inner cylindrical portion 626 covers the drive unit U2 from the outer diameter. The outer diameter of the inner cylindrical portion 626 is smaller than the inner diameter of the outer cylindrical portion 624, and together with the outer cylindrical portion 624, the inner cylindrical portion 626 forms a double cylindrical body. The closing portion 629 covers the drive unit U2 from the base end side.

[0030] The bottom portion 623 comprises a cylindrical bottom tube portion 640 and a closing portion 641 that closes the base end side of the bottom tube portion 640. The bottom tube portion 640 covers the extended tube portion 628 of the inner portion 621 from the radially outer side. The closing portion 641 covers the closing portion 629 of the inner portion 621 from the base end side.

[0031] The diaphragm holder 63 comprises a ring-shaped plate base 630 and a cylindrical holder section 631 extending from the inner edge of the base 630 toward the tip. The diaphragm holder 63 also amplifies the sound from the vibrating section 2 through the air column effect of the holder section 631.

[0032] The base end of the holder cylinder portion 631 is provided with an annular groove 632 that is recessed towards the tip. This groove 632 is filled with, for example, a fixing portion 633. For example, the fixing portion 633 is made of silicone.

[0033] The diaphragm unit U1 is cylindrical with its base end closed, and its cross-section is U-shaped.

[0034] The vibrating part 2 is a sound source that emits sound by vibrating when an electric current is applied. Furthermore, the polarity of the electric current in the vibrating part 2 differs between the inner and outer sides in the radial direction. , ingredients Physically, it is a disc-shaped diaphragm. The vibrating part 2 is electrically connected to the drive unit U2. The vibrating part 2 is pressed against the diaphragm unit U1 by the biasing force of the intervening part 5 and transmits vibrations to the diaphragm unit U1.

[0035] The drive unit U2 is equipped with a power supply circuit and the like that generates an alternating current to vibrate the vibrating part 2. The drive unit U2 is also provided with cable terminals and the like for inputting electrical signals.

[0036] The contact unit U3 includes a portion that conducts electricity to the vibrating portion 2. In addition to the fixed contact portion 3 and the expandable contact portion 4, the contact unit U3 also includes a support portion 30 that supports the fixed contact portion 3 and a base portion 31.

[0037] As shown in Figure 4, the fixed contact portion 3 is the part for supplying current to the radially outer portion (outer circumference) 21 of the vibrating portion 2. The fixed contact portion 3 also contacts the radially outer portion 21 of the vibrating portion 2 from the base end side via the intervening portion 5. Furthermore, the fixed contact portion 3 does not deform even when the vibrating portion 2 vibrates, and its shape is fixed.

[0038] In this embodiment, the fixed contact portion 3 is cylindrical and contacts the intervening portion 5 at multiple points in the circumferential direction. The fixed contact portion 3 contacts the intervening portion 5 at three points in the circumferential direction, but it may contact the intervening portion 5 at one point, two points, or four or more points in the circumferential direction. The fixed contact portion 3 is electrically connected to the vibrating portion 2 via the intervening portion 5. The fixed contact portion 3 is made of metal.

[0039] The support portion 30 is a part for fixing the position of the fixed contact portion 3. Furthermore, the support portion 30 fixes the radial position of the fixed contact portion 3 by positioning the fixed contact portion 3 at the tip of the support portion 30.

[0040] The base portion 31 comprises a disc portion 310 with a through hole in the center, and a rectangular plate-shaped spacer 311 extending from the base end surface of the disc portion 310 toward the base end (Figure 2). The base portion 31 also comprises a cylindrical portion 312 provided within the through hole of the disc portion 310.

[0041] The disc portion 310 is superimposed on the base 630 of the diaphragm holder 63 from the base end side (Figure 3). The spacer 311 is provided between the drive unit U2 and the explosion-proof container 6 (specifically, the container body 60).

[0042] The support portion 30 and the base portion 31 are made of an insulating material, such as ceramic.

[0043] The expandable / contractible contact portion 4 is the part for supplying current to the inner diameter portion 22 of the vibrating portion 2 (the inner circumference portion, the portion located inward in diameter from the connection point with the fixed contact portion 3). The expandable / contractible contact portion 4 also abuts the inner diameter portion 22 of the vibrating portion 2 from the base end side. The expandable / contractible contact portion 4 is a part that expands and contracts in the thickness direction to follow the vibrating portion 2. That is, the expandable / contractible contact portion 4 is a part that expands and contracts in the axial direction to follow the vibration of the vibrating portion 2. In this embodiment, a coil spring is used as the expandable / contractible contact portion 4, but other materials may be used. Furthermore, the position of the expandable / contractible contact portion 4 in the radial direction is fixed by being positioned inside the cylindrical portion 312.

[0044] The intervening portion 5 is made of a conductor and is ring-shaped. In this embodiment, the intervening portion 5 is O-shaped (continuous ring shape), but it may also be C-shaped (ring shape with a slit). Furthermore, the intervening portion 5 has a wavy shape in the circumferential direction when viewed from the radial direction. That is, the intervening portion 5 has a shape in which a portion that bulges towards the tip end and a portion that bulges towards the base end are alternately arranged in the circumferential direction when viewed from the axial direction. In addition, the intervening portion 5 has a ring portion 50 that generates a biasing force when compressed in the axial direction. The intervening portion 5 is made of metal, for example, stainless steel.

[0045] With the above configuration, even if a gap occurs between the vibrating part 2 and the fixed contact part 3 during the assembly of the explosion-proof buzzer 1, the intervening part 5, which generates an axial biasing force, can appropriately adjust this gap. Therefore, in the completed explosion-proof buzzer 1, there will be no uneven gaps between the vibrating part 2 and the fixed contact part 3, and the vibration of the vibrating part 2 can be stabilized. As a result, the explosion-proof buzzer 1 can produce a stable sound.

[0046] Furthermore, the intervening portion 5 is constructed by stacking multiple ring portions 50 in the thickness direction. In this configuration, the biasing force in the axial direction can be adjusted by changing the number of stacked ring portions 50. In this embodiment, the ring portion 50 has a wavy shape in the circumferential direction when viewed from the radial direction. The thickness of the ring portion 50 is uniform.

[0047] The intervening portion 5 is composed of two stacked ring portions 50, but the biasing force in the axial direction may be increased by composing it with three or more stacked ring portions 50. Alternatively, the biasing force in the axial direction may be decreased by composing the intervening portion 5 with a single ring portion 50.

[0048] In this embodiment, a wave washer for preventing loosening of a fastening member having a screw is used as the ring portion 50. By using a wave washer, which is readily available on the market, as the ring portion 50, the cost of the parts can be reduced.

[0049] It should be noted that the explosion-proof buzzer of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the invention. For example, the configuration of one embodiment can be added to the configuration of another embodiment, and a part of the configuration of one embodiment can be replaced with the configuration of another embodiment. Furthermore, a part of the configuration of one embodiment can be deleted.

[0050] In the explosion-proof buzzer 1 of the above embodiment, a wave washer was used as the ring portion 50, but other materials may be used. For example, when forming the intervening portion 5 with a single ring portion 50, the gap between the vibrating portion 2 and the fixed contact portion 3 may be predicted at the design stage, and a ring portion 50 with a thickness corresponding to this gap may be newly formed from a conductive material and used as the intervening portion 5. [Explanation of Symbols]

[0051] 1... Explosion-proof buzzer, 2... Vibrating part, 3... Fixed contact part, 4... Expandable contact part, 5... Intervening part, 6... Explosion-proof container, 21... Outer diameter part, 22... Inner diameter part, 30... Support part, 31... Base part, 50... Ring part, 60... Container body, 61... Cap, 62... Container base, 63... Diaphragm holder, 310... Disc part, 311... Spacer, 312... Cylindrical part, 600... Large diameter cylinder part, 601... Plate part, 602... Small diameter cylinder part, 610... Cap body, 611... Connection part, 6 12, 613...Spacer, 614...Cap cylinder, 615...Cap cover plate, 620...Outer part, 621...Inner part, 623...Bottom, 624...Outer cylinder, 625...Plate, 626...Inner cylinder, 627...Plate, 628...Extended cylinder, 629...Closing part, 630...Base, 631...Holder cylinder, 632...Groove, 633...Fixing part, 640...Bottom cylinder, 641...Closing part, U1...Diaphragm unit, U2...Drive unit, U3...Contact unit

Claims

1. A plate-shaped vibrating part that emits sound by vibrating when an electric current is applied, the vibrating part having different polarities in the radial direction on the inside and outside, The vibrating part includes a fixed contact portion for energizing the outer diameter portion, The aforementioned expandable contact portion for supplying current to the inner diameter portion of the vibrating portion comprises an expandable contact portion that expands and contracts in the thickness direction to follow the vibrating portion, An intervening portion is interposed between the vibrating portion and the fixed contact portion, The system comprises an explosion-proof container that holds each of the vibrating part, the fixed contact part, the expandable contact part, and the intervening part, The intervening portion is formed from a conductor, is ring-shaped, has a wavy shape in the circumferential direction when viewed from the radial direction, and has a ring portion that generates a biasing force when compressed in the axial direction. Explosion-proof buzzer.

2. The explosion-proof buzzer according to claim 1, wherein the intervening portion is formed by stacking a plurality of ring portions in the thickness direction.

3. The explosion-proof buzzer according to claim 1 or 2, wherein a wave washer for preventing loosening of a fastening member having a screw is used as the ring portion.

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