Alarm device

Abstract

To obtain an alarm device that can easily produce an alarm sound of the desired sound pressure. [Solution] The disaster prevention equipment control device 1, which serves as an alarm device, comprises a housing 2 having a door 4 with an acoustic hole 5 and a cylindrical speaker mounting portion 9 formed therein, a speaker 10 positioned inside the speaker mounting portion 9 so as to face at least a part of the acoustic hole 5, and an adapter 12. The adapter 12 has an annular wall 125 and a locking portion 128 which are holding portions for holding the speaker 10, and positions and fixes the sound wave output surface 101 of the speaker 10 relative to the acoustic hole 5 by creating a space between the sound wave output surface 101 of the speaker 10 and the inner surface 4b of the door 4.

Description

Technical Field

[0001] The present invention relates to an alarm device provided with a speaker.

Background Art

[0002] Conventionally, there has been an alarm device provided with a speaker that generates an alarm sound. For example, Patent Document 1 discloses a device for fire alarm equipment in which a speaker that generates an alarm sound is attached to the door of a housing (FIGS. 2 and 3).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In an alarm device related to disaster prevention, it is necessary to output an alarm sound with a predetermined sound pressure, and in some types of alarm devices, the sound pressure to be ensured is defined. However, if a deviation occurs in the positional relationship between the speaker and the sound hole when assembling the alarm device, an alarm sound with the desired sound pressure may not be obtained. Furthermore, although the alarm device is provided with a mounting hole having the same diameter as the speaker, a speaker having a smaller diameter cannot be mounted in this mounting hole. If an attempt is made to force the mounting, the speaker cannot be mounted in the correct position, and there is a risk that the speaker will fall off.

[0005] The present invention is based on the above problems, and provides an alarm device capable of outputting an alarm sound with a desired sound pressure.

Means for Solving the Problems

[0006] The alarm device according to the present invention comprises a housing having a panel formed with an acoustic hole and a cylindrical speaker mounting portion, a speaker disposed inside the speaker mounting portion so as to face at least a part of the acoustic hole, and an adapter having a holding portion for holding the speaker, which positions and fixes the sound wave output surface of the speaker relative to the acoustic hole by creating a space between the sound wave output surface of the speaker and the inner surface of the panel. [Effects of the Invention]

[0007] The alarm device of the present invention includes an adapter that creates a space between the sound wave output surface of the speaker and the inner surface of the housing panel, and positions and fixes the sound wave output surface relative to the acoustic hole. This allows the space to function as a resonator, improving the sound pressure, and the fixed position of the speaker enables stable output of an alarm sound at the desired sound pressure. Furthermore, by using the adapter, a smaller diameter speaker can be fixed within the speaker mounting section when the previously used speaker becomes unusable due to discontinuation of production, etc. Moreover, since the adapter absorbs the difference in diameter between the speaker mounting section and the speaker, it becomes possible to mount the speaker in the correct position, resulting in a better appearance. [Brief explanation of the drawing]

[0008] [Figure 1] This diagram shows the configuration of a disaster prevention equipment control device according to an embodiment. [Figure 2] This figure shows a speaker attached to the door of a disaster prevention equipment control device according to an embodiment. [Figure 3] This is an exploded perspective view showing the speaker mounting structure according to the embodiment. [Figure 4] This figure schematically shows a perspective view of the vicinity of a speaker according to an embodiment, and a cross-section thereof. [Figure 5] This is a schematic cross-sectional view of the adapter and door according to the embodiment. [Modes for carrying out the invention]

[0009] The embodiments describe a case in which the alarm device of the present invention is a disaster prevention equipment control device that activates disaster prevention equipment. The present invention is not limited to the following embodiments and illustrated embodiments, and can be modified in various ways without departing from the spirit of the invention. Furthermore, the present invention includes all possible combinations of the configurations shown in the following embodiments. Also, in each figure, parts denoted by the same reference numerals are the same or corresponding parts, and this is common throughout the entire specification. Furthermore, in the following description, terms indicating direction will be used as appropriate to facilitate understanding, but these are for illustrative purposes only and do not limit the present invention.

[0010] Embodiment. Figure 1 shows the configuration of a fire prevention equipment control device 1 according to an embodiment. The fire prevention equipment control device 1 is connected to a smoke control device 30 and, when operated by a user who has discovered a fire, outputs an alarm sound and outputs an operation command to the smoke control device 30. The smoke control device 30 is a device for preventing the spread of fire and the propagation of smoke, and for effectively discharging smoke or toxic gases caused by the fire, and is an example of a fire door, shutter, smoke exhaust fan, pressurized blower, etc. Note that the smoke control device 30 is an example of fire prevention equipment that operates in response to an operation command from the fire prevention equipment control device 1, and the fire prevention equipment may be a sprinkler system or broadcasting equipment, etc., and the specific equipment is not limited.

[0011] The disaster prevention equipment control device 1 has a housing 2. The housing 2 has a box-shaped case 3 with one side open, and a door 4 that can be opened and closed to cover the opening of the case 3. The housing 2 is made up of panels made of metal or synthetic resin, and one of these panels is the door 4. The surface of the door 4 that is exposed to the outside is called the outer surface 4a, and the surface of the door 4 opposite to the outer surface 4a is called the inner surface 4b (see Figure 2). The door 4 is provided with an acoustic hole 5, an operating section 6, and a display section 7. A signal output section 8 and a speaker 10 are also provided inside the housing 2.

[0012] The acoustic hole 5 is an opening that penetrates the door 4. In this embodiment, the acoustic hole 5 is shown as consisting of multiple oval-shaped openings, but the shape and number of openings constituting the acoustic hole 5 are not limited to those shown. The alarm sound emitted from the speaker 10 inside the housing 2 is radiated to the outside of the disaster prevention equipment control device 1 through the acoustic hole 5. In this embodiment, an example is shown in which the acoustic hole 5 is provided in the door 4, but the acoustic hole 5 may be provided in any panel constituting the housing 2, for example, the acoustic hole 5 may be provided in the case 3.

[0013] The operation unit 6 is a device that receives input from the user and is a hardware input device such as a push button or switch, a touch panel, or a combination thereof. In this embodiment, the operation unit 6 is a hardware input device and is provided on the outer surface 4a of the door 4. The operation unit 6 is, for example, an activation switch for operating the smoke control device 30, or a stop switch for stopping the alarm sound.

[0014] The display unit 7 is an indicator light such as a light bulb, discharge lamp, or light-emitting diode, a liquid crystal display, an organic EL display, or an electronic paper display, or a combination thereof. The display unit 7 displays the operating status of the disaster prevention equipment control device 1. The display unit 7 is, for example, an operation light that indicates that the smoke control device 30 is operating, or an alarm light that indicates that an alarm sound is being emitted.

[0015] The signal output unit 8 outputs an activation signal to activate the smoke control device 30. The signal output unit 8 and the smoke control device 30 are connected by a dedicated signal line, but they may also be connected by general-purpose wired or wireless communication. When an operation is performed on the operation unit 6 to activate the smoke control device 30, the signal output unit 8 outputs an activation signal to the smoke control device 30. The fire prevention equipment control device 1 may be connected to a fire alarm receiver (not shown), and the signal output unit 8 may output an activation signal based on a control signal from the fire alarm receiver.

[0016] FIG. 2 is a diagram showing a speaker 10 attached to a door 4 of the disaster prevention equipment control device 1 according to the embodiment. In FIG. 2, for the sake of explanation, the position of the sound hole 5 provided in the door 4 is indicated by a broken line. FIG. 3 is an exploded perspective view showing the mounting structure of the speaker 10 according to the embodiment. FIG. 4 is a perspective view of the vicinity of the speaker 10 according to the embodiment and a diagram schematically showing its cross section. In FIG. 2, the illustration of the fixing plate 14 shown in FIGS. 3 and 4 and the members related thereto is omitted.

[0017] On the inner surface 4b of the door 4, a cylindrical speaker mounting portion 9 for accommodating the speaker 10 is provided. In the present embodiment, the speaker mounting portion 9 is an annular wall protruding from the inner surface 4b toward the inside of the case 3 (FIG. 1). Inside the speaker mounting portion 9, an adapter 12 and a speaker 10 attached to the adapter 12 are accommodated. A sound hole 5 is formed inside the speaker mounting portion 9, and the speaker 10 faces at least a part of the sound hole 5.

[0018] The speaker 10 vibrates the sound wave output surface 101 by an electrical signal transmitted from the cable 11, and emits an alarm sound by vibrating the air by the vibration of the sound wave output surface 101. As shown in FIG. 4, the sound wave output surface 101 constitutes most of the surface of the speaker 10 on the side of the sound hole 5, and an edge portion 102 is provided on the outer peripheral portion of the sound wave output surface 101. The edge portion 102 supports the periphery of the sound wave output surface 101. The sound wave output surface 101 is arranged so as to face at least a part of the sound hole 5 of the door 4.

[0019] The cable 11 connects the speaker 10 and a control device (not shown). The cable 11 transmits an electrical signal from the control device to the speaker 10.

[0020] The adapter 12 is a member for fixing the speaker 10 to the door 4. The adapter 12 positions the sound wave output surface 101 of the speaker 10 with respect to the sound hole 5. The adapter 12 in the present embodiment is a member having a generally donut-shaped outer form. The adapter 12 is made of, for example, synthetic resin. The adapter 12 has a plate-like portion 121, a leg portion 122, an outer wall portion 123, a hole portion 124, an annular wall 125, a rib 126, a notch portion 127, and a locking portion 128.

[0021] The plate-like portion 121 is a plate-like member arranged to face the inner surface 4b of the door 4. The leg portion 122 is an annular wall extending from the outer periphery of the plate-like portion 121 toward the door 4. The leg portion 122 is arranged inside the speaker mounting portion 9 so as to contact the inner surface 4b of the door 4. The outer wall portion 123 is an annular wall extending from the outer periphery of the plate-like portion 121 in a direction opposite to the door 4, that is, in a direction away from the door 4.

[0022] A hole portion 124 penetrating the plate-like portion 121 is formed at the center of the plate-like portion 121. The hole portion 124 is substantially the same size and shape as the sound wave output surface 101 of the speaker 10. An annular wall 125 extending in a direction opposite to the door 4, that is, in a direction away from the door 4, is provided on the outer peripheral side of the hole portion 124. A flange-shaped locking portion 128 extending toward the center side of the hole portion 124 is provided at the base of the annular wall 125. The speaker 10 is fitted inside the annular wall 125. The inner diameter of the annular wall 125 is the same as or slightly larger than the outer diameter of the speaker 10, and the annular wall 125 positions the speaker 10 in the radial direction. In a state where the speaker 10 is accommodated inside the annular wall 125, an edge portion 102 on the outer peripheral portion of the sound wave output surface 101 abuts against the locking portion 128. In this state, the speaker 10 is supported by the edge portion 102 by the locking portion 128, and the sound wave output surface 101 is arranged to face the space of the hole portion 124 in a vibratable state. The annular wall 125 and the locking portion 128 function as a holding portion for holding the speaker 10.

[0023] A part of the outer wall portion 123 has a lower height, and this portion is referred to as a notch portion 127. A cable 11 connected to the speaker 10 is arranged in the notch portion 127.

[0024] On the inside of the outer wall portion 123, one or more ribs 126 are provided to connect the outer wall portion 123 and the annular wall 125. In this embodiment, there are four radially extending ribs 126 and two generally parallel ribs 126 extending from the notch portion 127 toward the annular wall 125. The four radially extending ribs 126 are positioned at approximately 90-degree angles to adjacent ribs. A cable 11 is positioned between the two ribs 126 extending from the notch portion 127, and these two ribs 126 function as guides for the cable 11. The ribs 126 that radially connect the annular outer wall portion 123 and the annular wall 125 suppress deformation of the adapter 12, which is made of synthetic resin.

[0025] The elastic member 13 is made of an elastic material such as rubber, silicone, or foamed urethane, and is placed between the speaker 10 and the fixing plate 14 in a slightly compressed state. As will be described later, the speaker 10 is covered and fixed by the fixing plate 14, and at this time the elastic member 13 absorbs the load applied to the speaker 10 from the fixing plate 14.

[0026] The fixing plate 14 is fixed to the inner surface 4b of the door 4 with the speaker 10 and elastic member 13 sandwiched between it and the adapter 12. The fixing plate 14 is a plate-shaped member made of metal or synthetic resin. In this embodiment, the fixing plate 14 has a shape in which a tongue-shaped plate extends from a circular disc with a diameter that is approximately the same as or larger than the outer diameter of the adapter 12, but this shape is not particularly limited. The fixing plate 14 has fixing holes 141 that pass through it. A screw 16 is inserted into the fixing hole 141 and screwed into a fixing part 15 provided on the door 4, thereby fixing the fixing plate 14 to the door 4. As a result, the adapter 12, speaker 10 and elastic member 13, which are positioned between the fixing plate 14 and the door 4, are also fixed to the door 4. In this embodiment, the fixing plate 14 is shown to be attached to the door 4 by screws 16. However, for example, a claw may be provided on one of the fixing plate 14 and the door 4, and a member that the claw engages with may be provided on the other to fix them together.

[0027] Figure 5 is a schematic cross-sectional view of the adapter 12 and door 4 according to the embodiment. In Figure 5, the multiple acoustic holes 5 shown in Figure 1, etc., are shown as a single modeled acoustic hole 5. The acoustic hole 5 shown in Figure 5 is assumed to have the same opening area as the sum of the opening areas of the multiple acoustic holes 5 shown in Figure 1, etc. Also, in Figure 5, the door 4, speaker 10, and adapter 12 are shown in a simplified manner for illustrative purposes.

[0028] The inner diameter of the speaker mounting portion 9 and the outer diameter of the adapter 12 are substantially equal. When the adapter 12 is fitted into the speaker mounting portion 9, the radial positioning of the adapter 12 is achieved, and the adapter 12 is fixed within the speaker mounting portion 9. The protrusion height of the speaker mounting portion 9 from the inner surface 4b is the same as the protrusion height of the adapter 12 from the inner surface 4b when it is attached to the speaker mounting portion 9, and in Figure 5, both protrusion heights are indicated by the symbol A. That is, the upper end faces of the outer wall portion 123 and annular wall 125 of the speaker mounting portion 9 and the adapter 12 are on the same plane as shown in Figure 5. The thickness B of the leg portion 122 and the thickness C of the outer wall portion 123 may be the same or different. Furthermore, the thicknesses B and C may change so as to become thicker or thinner along the vertical direction of the paper in Figure 5.

[0029] The adapter 12 forms a space 20 between the sound wave output surface 101 of the speaker 10 and the inner surface 4b of the door 4. In this embodiment, the space 20 is the region enclosed by the leg portion 122, the plate-like portion 121, and the inner surface 4b. That is, the space 20 is formed by the leg portion 122 having a height H. The space 20 communicates with the outside of the space 20 through the acoustic hole 5. This space 20 functions as a Helmholtz resonator.

[0030] According to the Helmholtz resonator principle, the following equation (1) holds true. fv = CD / 4 {1 / πV(L+0.75D)} 1 / 2 ...(1) Note that fv is the resonant frequency (Hz) of the resonator, and V is the resonator volume (mm²). 3), D is the diameter of the acoustic hole 5 (mm), L is the length of the acoustic hole 5 (mm), and C is the speed of sound, which is approximately 344,000 (mm / sec).

[0031] By providing the space 20, which functions as a resonator, in the region facing the vibrating sound wave output surface 101, the sound waves generated by the sound wave output surface 101 are amplified, and the sound pressure of the alarm sound output from the speaker 10 can be increased.

[0032] For example, there is a regulation that the sound pressure of an alarm device for fire alarm systems at its rated voltage should be 85 dB or higher, measured at a point 1 meter in front of the center of the alarm device. In this embodiment, since a space 20 acting as a resonator is formed, the desired sound pressure of the alarm can be obtained by adjusting the values ​​of each parameter in equation (1). For example, the value of L in equation (1) can be adjusted by increasing the thickness B of the leg portion 122 by bringing the inner surface of the leg portion 122 closer to the center of the adapter 12, and by blocking the acoustic hole 5 (see Figures 2 to 4) which is radially outward from the outer circumference of the speaker 10. Furthermore, by providing a space 20 acting as a resonator, it is easier to obtain the desired sound pressure of the alarm even when using a small speaker 10 with a low rated voltage. In other words, according to this embodiment, the speaker 10 required to obtain the same sound pressure of the alarm can be made smaller compared to when the space 20 is not provided.

[0033] As described above, the disaster prevention equipment control device 1 of this embodiment comprises a housing 2 having a door 4 which is a panel in which an acoustic hole 5 and a speaker mounting portion 9 are formed, a speaker 10 positioned inside the speaker mounting portion 9 so as to face at least a part of the acoustic hole 5, and an adapter 12. The adapter 12 has an annular wall 125 and a locking portion 128 as a holding portion for holding the speaker 10, and positions the sound wave output surface 101 with respect to the acoustic hole 5 by creating a space 20 between the sound wave output surface 101 of the speaker 10 and the inner surface 4b of the door 4. As a result, an alarm sound with the desired sound pressure can be obtained as described above. Furthermore, since the adapter 12 positions the sound wave output surface 101 with respect to the acoustic hole 5, the volume of the space 20 as a resonator is maintained, and the sound pressure of the alarm sound can also be stabilized. Furthermore, if a large speaker with a diameter matching the speaker mounting section 9 was installed in the existing housing 2 without using the adapter 12, and that large speaker becomes unusable due to discontinuation of production or other reasons, it can be replaced with the adapter 12 and speaker 10 combination of this embodiment. This makes it possible to miniaturize the speaker 10 and stabilize the alarm sound pressure while utilizing the existing housing 2. In addition, since the adapter 12 absorbs the difference in diameter between the speaker mounting section 9 and the speaker 10, it becomes possible to mount the speaker 10 in the correct position, and the appearance is also improved.

[0034] Furthermore, as shown in Figure 4, a portion of the acoustic hole 5 may face the plate-shaped portion 121 of the adapter 12. That is, a small speaker 10 may be used such that the area of ​​the sound wave output surface 101 of the speaker 10 is smaller than the area of ​​the region where the acoustic hole 5 is provided, and a portion of the acoustic hole 5 may face the plate-shaped portion 121. Even with such a configuration, since a space 20 acting as a resonator is provided, an alarm sound of the desired sound pressure can be obtained.

[0035] Furthermore, in this embodiment of the disaster prevention equipment control device 1, a notch 127 is formed in a part of the outer wall portion 123 of the adapter 12, where the cable 11 connected to the speaker 10 is positioned. This allows the position of the cable 11 to be stabilized.

[0036] Furthermore, the disaster prevention equipment control device 1 of this embodiment is equipped with a fixing plate 14 that is fixed to the door 4 with the speaker 10 sandwiched between it and the adapter 12. As a result, the position of the speaker 10 relative to the door 4 can be stabilized, and the volume of the space 20 acting as a resonator can also be stabilized, thereby stabilizing the sound pressure of the alarm sound.

[0037] Furthermore, the disaster prevention equipment control device 1 of this embodiment includes an elastic member 13 positioned between the fixing plate 14 and the speaker 10. This allows the load applied from the fixing plate 14 to the speaker 10 to be absorbed by the elastic member 13, thereby preventing excessive load from being applied to the speaker 10 and thus preventing speaker 10 failure due to load. The elastic member 13 may also be positioned between the fixing plate 14 and the speaker 10 in a compressed state. This allows the speaker 10 to be biased against the adapter 12 by the elastic member 13, further stabilizing the position of the speaker 10. For this reason, even if vibration is applied to the disaster prevention equipment control device 1, for example, displacement of the speaker 10 relative to the acoustic hole 5 can be suppressed. In addition, by providing the elastic member 13, it is possible to suppress the propagation of vibrations generated from the speaker 10 through the fixing plate 14 and fixing hole 141 to the housing 2, etc., and adversely affect other parts.

[0038] In this embodiment, as an example of an alarm device, a fire safety equipment control device 1, also called an interlocking control panel, is shown, which is a device that operates the smoke control device 30. However, the alarm device is not limited to the fire safety equipment control device 1, and may be, for example, a fire alarm receiver or display unit having a speaker. [Explanation of Symbols]

[0039] 1 Disaster prevention equipment control device, 2 Housing, 3 Case, 4 Door, 4a Outer surface, 4b Inner surface, 5 Acoustic hole, 6 Operating section, 7 Display section, 8 Signal output section, 9 Speaker mounting section, 10 Speaker, 11 Cable, 12 Adapter, 13 Elastic member, 14 Fixing plate, 15 Fixing section, 16 Screw, 20 Space, 30 Smoke prevention and exhaust device, 101 Sound wave output surface, 102 Edge section, 121 Plate-like section, 122 Leg section, 123 Outer wall section, 124 Hole section, 125 Annular wall, 126 Rib, 127 Notch section, 128 Locking section, 141 Fixing hole.

Claims

1. A housing having a panel with acoustic holes and a cylindrical speaker mounting portion, A speaker is positioned inside the speaker mounting portion so as to face at least a portion of the acoustic hole, The system includes a holder that holds the speaker, and an adapter that positions and fixes the sound wave output surface relative to the acoustic hole, with a space between the sound wave output surface of the speaker and the inner surface of the panel. Alarm device.

2. The aforementioned adapter is A plate-shaped portion facing the aforementioned panel, Legs extending from the outer circumference of the plate-like portion toward the panel, An outer wall portion extending from the outer periphery of the plate-like portion toward the opposite side from the panel, The hole formed in the plate-like portion, The retaining portion is provided on the outer circumference of the hole and has an annular wall extending toward the opposite side from the panel. The alarm device according to claim 1.

3. At least a portion of the plate-like portion faces at least a portion of the acoustic hole. The alarm device according to claim 2.

4. A notch is formed in a portion of the outer wall for routing the cable connected to the speaker. The alarm device according to claim 2 or claim 3.

5. The panel is equipped with a fixing plate that is fixed to the panel with the speaker sandwiched between it and the adapter. An alarm device according to any one of claims 1 to 3.

6. The fixed plate and the speaker are provided with an elastic member. The alarm device according to claim 5.

7. It is equipped with a signal output unit that outputs a signal to activate the smoke control and exhaust system. An alarm device according to any one of claims 1 to 3.

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