CN220709747U - Fire alarm device - Google Patents

Abstract

The utility model relates to a fire alarm device, which is arranged on a ceiling, wherein the ceiling is provided with a mounting hole, and the fire alarm device comprises a shell, an alarm assembly and an elastic piece, wherein: the shell comprises an exposed part and an extending part provided with a mounting cavity, and the extending part can extend into the mounting hole; the alarm component is accommodated in the installation cavity; the elastic piece is arranged at the extending part and has a stable state and a deformation state, the elastic piece and the exposed part are respectively abutted to the two side surfaces of the ceiling in the stable state, and the elastic piece deforms in the deformation state and can extend into or separate from the mounting hole along with the extending part. The volume of the fire alarm device exposed can be reduced, the aesthetic degree is improved, and the risk that the fire alarm device is collided and falls off can be reduced, so that potential safety hazards are reduced; and the fire alarm device does not need to be installed on a ceiling by adopting a quick-mounting plate, has small number of parts, is simple and convenient in disassembly and assembly process, and is convenient for users to operate.

Description

Fire alarm device

Technical Field

The utility model relates to the technical field of fire-fighting equipment, in particular to a fire alarm device.

Background

Fire alarms are commonly used in buildings where a thermal element in the fire alarm physically changes when objects release a large amount of heat during the combustion process, resulting in a sudden rise in ambient temperature, thereby triggering an alarm.

In the installation process of the existing fire alarm, the quick-mounting plate is usually required to be mounted on a ceiling through fasteners such as screws and bolts, and then the alarm is connected with the quick-mounting plate, so that the installation process is complex. And the alarm is wholly exposed below the ceiling after the installation is finished, is abrupt, has the risk of being collided and falling, and has certain potential safety hazard.

Disclosure of Invention

Based on this, it is necessary to provide a fire alarm device for solving the above problems, which is simple and convenient in the process of disassembly and assembly, and can improve the aesthetic degree and reduce the potential safety hazard.

The utility model provides a fire alarm device, which is installed on a ceiling, the ceiling is provided with an installation hole, and the fire alarm device is characterized by comprising: the shell comprises an exposed part and an extending part provided with a mounting cavity, and the extending part can extend into the mounting hole; the alarm assembly is accommodated in the installation cavity; and the elastic piece is arranged on the extending part and has a stable state and a deformation state, the elastic piece and the exposed part are respectively abutted to the two side surfaces of the ceiling in the stable state, and in the deformation state, the elastic piece deforms and can extend into/out of the mounting hole along with the extending part.

In the fire alarm device, when the fire alarm device is required to be installed, the elastic piece is controlled to be in a deformation state, the elastic piece can extend into the installation hole along with the extending part, after the extending part completely extends into the installation hole, the elastic piece is positioned above the ceiling, external force applied to the elastic piece is removed, and the elastic piece is reset to a stable state, and at the moment, the elastic piece and the exposed part are respectively abutted against the two side surfaces of the ceiling, so that the fire alarm device is stably installed on the ceiling; when the fire alarm device needs to be disassembled, the elastic piece is controlled to be in a deformation state again, so that the elastic piece can be separated from the mounting hole along with the extending part. The extending part and the elastic piece extend into the upper part of the ceiling through the mounting hole, and the alarm assembly is accommodated in the mounting cavity of the extending part, so that the exposed volume of the fire alarm device can be reduced, the aesthetic degree is improved, and the risk that the fire alarm device is collided and falls down can be reduced, so that the potential safety hazard is reduced; and the fire alarm device does not need to be installed on a ceiling by adopting a quick-mounting plate, has small number of parts, is simple and convenient in disassembly and assembly process, and is convenient for users to operate.

In one embodiment, the exposed portion includes a top wall and a rim extending outwardly from an outer periphery of the top wall, the rim abutting an outer surface of the ceiling in the steady state.

When the edge is propped against the outer surface of the ceiling, the fire alarm device is installed in place, so that the installation and alignment of a user can be facilitated; and the contact area between the shell and the ceiling can be increased by attaching the edge to the outer surface of the ceiling, so that the stability and the reliability of the fire alarm device are improved.

In one embodiment, the extending portion includes a bottom wall and a side wall connected to each other, the exposed portion is connected to an end of the side wall away from the bottom wall, and the elastic member is disposed on the side wall and extends outwards from the side wall.

The setting for fire alarm device exposes in the volume of ceiling below minimum, and set up the elastic component in the lateral wall can also be convenient for the user control elastic component to deformation state when installing fire alarm device.

In one embodiment, the elastic member includes a supporting portion and a torsion spring, the supporting portion is disposed on the side wall and is capable of rotating relative to the side wall, and two torsion arms of the torsion spring are respectively limited on the side wall and the supporting portion.

The support part can automatically reset under the action of the torsion spring after completely extending into the mounting hole, so that the operation of a user is facilitated; in addition, the torsion spring can also stabilize the supporting part in a stable state, so that the stability and the reliability of the fire alarm device can be improved.

In one embodiment, the support portion includes an extension section and a support section, the extension section is disposed on the side wall and can rotate relative to the side wall, the support section is connected with an end of the extension section away from the side wall, and in the stable state, the support section abuts against an inner surface of the ceiling.

So set up, the support section is used for wholly supporting fire alarm device on the ceiling, and the extension section is used for connecting lateral wall and support section.

In one embodiment, one end of the extension is connected to one end of the side wall adjacent to the bottom wall, and in the steady state, the other end of the extension extends obliquely outward from the side wall toward the ceiling.

By the arrangement, the extension section, the side wall and the ceiling can form a triangle, and the stability and the reliability of the fire alarm device can be improved due to the fact that the triangle is good in stability.

In one embodiment, the extending portion further includes a fixing shaft disposed on the side wall and parallel to the bottom wall, the torsion spring is sleeved on the fixing shaft, and the supporting portion rotates around the fixing shaft.

The fixed shaft is used for limiting the torsion spring to generate torsion elastic deformation direction, so that the stability of the supporting part during rotation is ensured; and the user holds the exposed part and pulls downwards to detach the fire alarm device, so that the operation of the user is facilitated.

In one embodiment, the number of the elastic members is at least two, and the elastic members are arranged at intervals along the circumferential direction of the protruding portion.

So set up, at least two elastic components can improve fire alarm device's equilibrium and stability, avoid fire alarm device to incline or drop towards the one side that does not set up the elastic component, reduce the potential safety hazard.

In one embodiment, the alarm assembly comprises a PCB board, an induction member and an alarm member, wherein the induction member and the alarm member are electrically connected with the PCB board, and at least part of the induction member extends out of the installation cavity from the exposed portion; the alarm piece comprises a buzzer accommodated in the mounting cavity, and the exposed part is provided with a sound outlet communicated with the mounting cavity; and/or the alarm piece comprises an indicator lamp arranged on the exposed part.

So set up, the sensing piece stretches out the sensitivity and the accuracy of installation chamber and can guarantee the fire response, when the sensing piece detects that smoke concentration reaches certain threshold value in the environment, with the signal transmission who changes to the PCB board on, the PCB board receives the signal after, can control buzzer and send out sound, also can control the pilot lamp scintillation to inform the user through one or more modes.

In one embodiment, the fire alarm device further comprises a power member received within the mounting cavity, the power member being electrically connected to the alarm assembly; and/or, the fire alarm device further comprises a key arranged on the exposed part, and the key is electrically connected with the alarm assembly.

The power supply piece is used for supplying power to the PCB, the sensing piece and the alarm piece, an external power supply is not needed, the installation of a user is convenient, and the assembly cost can be reduced; the key can be used as other functional keys for resetting, detecting, switching and the like of the fire alarm device.

Drawings

In order to more clearly illustrate the technical solutions of embodiments or conventional techniques of the present application, the drawings that are required to be used in the description of the embodiments or conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.

FIG. 1 is a schematic perspective view of a fire alarm device according to an embodiment of the present utility model;

FIG. 2 is a schematic perspective view of FIG. 1 at another angle according to the present utility model;

FIG. 3 is a schematic view of the installation of the ceiling of FIG. 1 according to the present utility model;

FIG. 4 is a cross-sectional view of FIG. 1 provided by the present utility model;

fig. 5 is an exploded view of fig. 1 provided by the present utility model.

Reference numerals: 1. a housing; 11. a mounting cavity; 12. an extending portion; 121. a bottom wall; 122. a sidewall; 123. a fixed shaft; 13. an exposed portion; 131. a top wall; 1311. a sound outlet hole; 1312. avoidance holes; 132. an edge; 2. an alarm assembly; 21. a PCB board; 22. an induction member; 23. an alarm member; 231. a buzzer; 232. an indicator light; 3. an elastic member; 31. a support part; 311. an extension section; 312. a support section; 32. a torsion spring; 4. a power supply member; 5. a key; 51. an opening; 6. a ceiling; 61. and (5) mounting holes.

Detailed Description

In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is, however, susceptible of embodiment in many other forms than those described herein and similar modifications can be made by those skilled in the art without departing from the spirit of the application, and therefore the application is not to be limited to the specific embodiments disclosed below.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used in the description of the present application for purposes of illustration only and do not represent the only embodiment.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.

In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be a direct contact of the first feature with the second feature, or an indirect contact of the first feature with the second feature via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely under the second feature, or simply indicating that the first feature is less level than the second feature.

Unless defined otherwise, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. The term "and/or" as used in the specification of this application includes any and all combinations of one or more of the associated listed items.

Fire alarms are commonly used in buildings where a thermal element in the fire alarm physically changes when objects release a large amount of heat during the combustion process, resulting in a sudden rise in ambient temperature, thereby triggering an alarm. In the installation process of the existing fire alarm, the quick-mounting plate is usually required to be mounted on a ceiling through fasteners such as screws and bolts, and then the alarm is connected with the quick-mounting plate, so that the installation process is complex. And the alarm is wholly exposed below the ceiling after the installation is finished, is abrupt, has the risk of being collided and falling, and has certain potential safety hazard.

In order to solve the above problems, as shown in fig. 1 to 5, the present utility model provides a fire alarm device, which is simple and convenient in the assembly and disassembly process, and in which a part of the fire alarm device can extend into the ceiling, thereby improving the aesthetic degree and reducing the potential safety hazard.

As shown in fig. 3 to 4, specifically, the fire alarm device is mounted on a ceiling 6, the ceiling 6 is provided with a mounting hole 61, the fire alarm device comprises a housing 1, an alarm assembly 2 and an elastic member 3, wherein: the shell 1 comprises an exposed part 13 and an extending part 12 provided with a mounting cavity 11, wherein the extending part 12 can extend into the mounting hole 61; the alarm assembly 2 is accommodated in the installation cavity 11; the elastic member 3 is disposed on the extending portion 12, and the elastic member 3 has a stable state in which the elastic member 3 and the exposed portion 13 are respectively abutted against both side surfaces of the ceiling 6, and a deformed state in which the elastic member 3 is deformed and can extend into or out of the mounting hole 61 along with the extending portion 12.

In the fire alarm device provided by the embodiment of the utility model, when the fire alarm device is required to be installed, the elastic piece 3 is controlled to be in a deformation state, the elastic piece 3 can extend into the installation hole 61 along with the extending part 12, after the extending part 12 completely extends into the installation hole 61, the elastic piece 3 is positioned above the ceiling 6, the external force applied to the elastic piece 3 is removed, and the elastic piece 3 is reset to a stable state, at the moment, the elastic piece 3 and the exposed part 13 are respectively abutted against the two side surfaces of the ceiling 6, so that the fire alarm device is stably installed on the ceiling 6. Because under the assembled state, the fire alarm device only exposes the exposed part 13 below the ceiling 6, the extending part 12 and the elastic piece 3 extend into the upper part of the ceiling 6 through the mounting hole 61, and the alarm component 2 is accommodated in the mounting cavity 11 of the extending part 12, so that the exposed volume of the fire alarm device can be reduced, the attractive appearance degree is improved, and the risk that the fire alarm device is collided and falls down can be reduced, thereby reducing the potential safety hazard. When the fire alarm device needs to be disassembled, the elastic piece 3 is controlled to be in a deformation state again, so that the elastic piece 3 can be separated from the mounting hole 61 along with the extending part 12. The fire alarm device does not need to be installed on the ceiling 6 by adopting a quick-mounting plate, has a small number of parts, is simple and convenient in disassembly and assembly process, and is convenient for users to operate.

The ceiling 6 may be an integrated suspended ceiling, or may be a wooden ceiling, so long as a certain installation space is available above the ceiling 6, and the ceiling 6 may be provided with an installation hole 61 for installing the fire alarm device, which is not particularly limited herein.

As shown in fig. 1, 2 and 4, in the illustrated embodiment, the exposed portion 13 includes a top wall 131, the extending portion 12 includes a bottom wall 121 and a side wall 122 connected to each other, and the top wall 131 is connected to an end of the side wall 122 away from the bottom wall 121 so as to cover an opening of the mounting cavity 11 formed by the side wall 122 and the bottom wall 121. Like this, can not influence fire alarm device's normal use simultaneously for fire alarm device exposes in the minimum of ceiling 6 below, further promotes aesthetic measure, and can avoid fire alarm device to be collided and drop, thereby reduce the potential safety hazard. Wherein, the outer diameter of the bottom wall 121 and the side wall 122 is smaller than or equal to the diameter of the mounting hole 61, so as to ensure that the bottom wall 121 and the side wall 122 can extend into the mounting hole 61. In another embodiment, the exposed portion 13 may also include a top wall 131 and a peripheral wall (not shown) connected to each other, and an end of the peripheral wall away from the top wall 131 is connected to an end of the side wall 122 away from the bottom wall 121.

As shown in fig. 1 and 3, the exposed portion 13 further includes a rim 132 extending outwardly from the outer periphery of the top wall 131, and in a stable state, the rim 132 abuts against the outer surface of the ceiling 6. Wherein, the external diameter of the edge 132 is larger than the diameter of the mounting hole 61, so as to avoid the case 1 from fully extending into the mounting hole 61 to influence the normal installation of the fire alarm device. When the rim 132 abuts the outer surface of the ceiling 6, this indicates that the fire alarm device is installed in place, thereby enabling easy installation and alignment by the user. In addition, the contact area between the housing 1 and the ceiling 6 can be increased by attaching the rim 132 to the outer surface of the ceiling 6, so that the stability and reliability of the fire alarm device can be improved.

As shown in fig. 2 to 3, the elastic member 3 is disposed on the side wall 122 and extends outwardly from the side wall 122. Providing the elastic member 3 to the side wall 122 enables the elastic member 3 to be abutted against the inner surface of the ceiling 6 in a stable state, and also facilitates the user to control the elastic member 3 to a deformed state when installing the fire alarm device.

As shown in fig. 2 to 3, the elastic member 3 includes a supporting portion 31 and a torsion spring 32, the supporting portion 31 is disposed on the side wall 122 and can rotate relative to the side wall 122, and two torsion arms of the torsion spring 32 are respectively limited on the side wall 122 and the supporting portion 31. When the fire alarm device is installed, a user overcomes the elastic force of the torsion spring 32 to enable the supporting portion 31 to rotate to a deformation state relative to the side wall 122, at this time, the supporting portion 31 can extend into the installation hole 61 along with the extending portion 12, the torsion spring 32 is subjected to torsional elastic deformation, elastic potential energy is accumulated in the torsion spring 32, the external force received by the supporting portion 31 after the supporting portion 31 completely extends into the installation hole 61 disappears, the elastic potential energy of the torsion spring 32 is released, and the supporting portion 31 reversely rotates to a stable state under the action of torsional elastic force of the torsion spring 32 and is abutted to the inner surface of the ceiling 6. Thus, when the supporting portion 31 is completely inserted into the mounting hole 61, the supporting portion 31 can be automatically reset under the action of the torsion spring 32, without the need of inserting an external tool above the ceiling 6 or adding a complicated reset structure to control the resetting of the supporting portion 31, thereby facilitating the operation of the user. Further, the torsion spring 32 can stabilize the support 31 in a stable state, and thus the stability and reliability of the fire alarm device can be improved.

As shown in fig. 4 to 5, in the illustrated embodiment, the extending portion 12 further includes a fixing shaft 123 disposed on the side wall 122 and parallel to the bottom wall 121, the torsion spring 32 is sleeved on the fixing shaft 123, and the supporting portion 31 rotates around the fixing shaft 123. The fixing shaft 123 is used for limiting the direction of torsional elastic deformation of the torsion spring 32, and ensures the stability of the supporting portion 31 during rotation. The fixed shaft 123 is parallel to the bottom wall 121 such that when the fire alarm device is disassembled, the user can hold the exposed portion 13 and pull it downward, the supporting portion 31 abuts against the wall of the mounting hole 61 and rotates to a deformed state with respect to the side wall 122, at this time, the torsion spring 32 is twisted, the elastic member 3 can be separated from the mounting hole 61 along with the extending portion 12, the external force applied after the supporting portion 31 is completely separated from the mounting hole 61 disappears, and the supporting portion 31 reversely rotates to a stable state due to the resilience of the torsion spring 32. In this way, it is not necessary to extend above the ceiling 6 by an external tool or to add a complicated detaching structure to control the rotation of the supporting portion 31 to the deformed state when the fire alarm device is detached, so that the user operation can be facilitated.

Of course, in other embodiments, the fixed shaft 123 may be perpendicular to the bottom wall 121 or have a certain inclination angle with respect to the bottom wall 121, in a stable state, an end of the supporting portion 31 not connected to the side wall 122 may rotate away from the side wall 122 around the fixed shaft 123, and in a deformed state, an end of the supporting portion 31 not connected to the side wall 122 may rotate close to the side wall 122 around the fixed shaft 123.

As shown in fig. 3 to 4, the support portion 31 includes an extension portion 311 and a support portion 312, the extension portion 311 is disposed on the side wall 122 and is rotatable relative to the side wall 122, the support portion 312 is connected to an end of the extension portion 311 away from the side wall 122, and in a stable state, the support portion 312 abuts against an inner surface of the ceiling 6. The support section 312 is used for integrally supporting the fire alarm device on the ceiling 6, and the extension section 311 is used for connecting the side wall 122 and the support section 312.

As shown in fig. 3 to 4, in the illustrated embodiment, one end of the extension 311 is connected to one end of the side wall 122 near the bottom wall 121, and in a steady state, the other end of the extension 311 extends obliquely outward from the side wall 122 toward the ceiling 6. In this way, the extension 311, the side wall 122 and the ceiling 6 can form a triangle, and the stability and reliability of the fire alarm device can be improved because the triangle has good stability.

In another embodiment, one end of the extension 311 may be connected to an end of the sidewall 122 near the top wall 131, and the other end of the extension 311 extends horizontally outward from the sidewall 122 in a steady state. Of course, one end of the extension section 311 may be connected to any position on the side wall 122, so long as the support section 312 can abut against the inner surface of the ceiling 6 in a stable state, and the embodiment of the present utility model is not limited herein.

As shown in fig. 2, the number of the elastic members 3 is at least two, and the elastic members 3 are arranged at intervals along the circumferential direction of the projecting portion 12. The balance and stability of the fire alarm device can be improved by at least two elastic pieces 3, the fire alarm device is prevented from inclining or falling towards one side where the elastic pieces 3 are not arranged, and potential safety hazards are further reduced. Since the elastic member 3 is disposed in the circumferential direction of the protruding portion 12 and there is no need to install a corresponding part above the ceiling 6, there is no limitation on the specific position of the elastic member 3, and thus, the user can adjust the angle of the fire alarm device by rotating the exposed portion 13. Preferably, the number of the elastic members 3 is two, and the two elastic members 3 are relatively arranged at two sides of the extending part 12, so that the balance and stability of the fire alarm device can be ensured, and a user can conveniently control the elastic members 3 when installing the fire alarm device.

As shown in fig. 5, the alarm assembly 2 includes a PCB 21, a sensing member 22 and an alarm member 23, wherein the sensing member 22 and the alarm member 23 are electrically connected to the PCB 21, and at least a portion of the sensing member 22 protrudes from the exposed portion 13 out of the mounting cavity 11. The sensing piece 22 stretches out of the installation cavity 11 to ensure the sensitivity and accuracy of fire sensing, when the sensing piece 22 detects that the smoke concentration in the environment reaches a certain threshold value, a changed signal is transmitted to the PCB 21, and the PCB 21 receives the signal and then controls the alarm piece 23 to alarm, so that a user knows the situation. The sensing member 22 may be provided, among other things, as a heat sensitive element, a light sensitive element or the like which can be used for detecting the concentration of smoke. And, the alarm assembly 2 may be used to detect one or more fumes of carbon monoxide, gas, etc.

As shown in fig. 1 and 5, in the illustrated embodiment, the alarm member 23 includes a buzzer 231 accommodated in the installation cavity 11, and the top wall 131 of the exposed portion 13 is provided with a sound outlet hole 1311 communicating with the installation cavity 11. The alarm 23 further includes an indicator light 232 disposed on the exposed portion 13. The alarm 23 also includes a wireless module disposed on the PCB. After the PCB 21 receives the signal, it controls the buzzer 231 to make a sound, controls the indicator lamp 232 to flash, and controls the wireless module to send the signal to the communication device such as the mobile phone of the user, so as to inform the user in various modes. The sound outlet hole 1311 allows the sound emitted from the buzzer 231 to be diffused as outwardly as possible. Of course, in other embodiments, the alarm 23 may be set to one, two or more of the buzzer 231, the indicator light 232, and other alarm elements of the wireless module according to the actual requirements of the use environment, which is not particularly limited herein.

As shown in fig. 4 to 5, the fire alarm device further includes a power member 4 accommodated in the installation cavity 11, and the power member 4 is electrically connected to the alarm assembly 2. The power supply part 4 is used for supplying power to the components inside the shell 1 such as the PCB 21, the sensing part 22 and the alarm part 23, so that the fire alarm device does not need an external power supply, and therefore, a cable is not required to be connected in the ceiling 6 when the fire alarm device is installed, the installation of a user is convenient, and the assembly cost can be reduced.

As shown in fig. 4 to 5, the fire alarm device further includes a key 5 provided at the exposed portion 13, and the key 5 is electrically connected to the alarm assembly 2. The key 5 can be used for resetting the fire alarm device, and when a user finds that no fire occurs through inspection, the fire alarm device can be reset by pressing the key 5 after false alarm exists for the fire alarm device. Of course, the key 5 may be used as a detection, switch or other function key of the fire alarm device.

Wherein, roof 131 still is equipped with dodges the hole 1312, and sensing piece 22 can stretch out installation cavity 11 through dodging the hole 1312, and roof 131 is located to button 5 protruding and is covered in dodging the hole 1312, and button 5 is equipped with the opening 51 with installation cavity 11 intercommunication. Like this, button 5 can play the guard action to the part that inductor 22 stretched out installation cavity 11, avoids inductor 22 to receive the collision and damage, simultaneously, opening 51 also can avoid button 5 to influence the normal detection of inductor 22, guarantees inductor 22 sensitivity and accuracy to the fire sensing.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of the present application is to be determined by the following claims.

Claims (10)

1. A fire alarm device mounted to a ceiling (6), the ceiling (6) being provided with mounting holes (61), characterized by comprising:

the shell (1) comprises an exposed part (13) and an extending part (12) provided with a mounting cavity (11), and the extending part (12) can extend into the mounting hole (61);

the alarm assembly (2) is accommodated in the installation cavity (11); the method comprises the steps of,

elastic piece (3), set up in stretch into portion (12), elastic piece (3) have steady state and deformation state steady state elastic piece (3) with expose portion (13) butt respectively in the both sides surface of ceiling (6) in deformation state elastic piece (3) take place deformation and can follow stretch into portion (12) stretch into/deviate from mounting hole (61).

2. Fire alarm device according to claim 1, wherein the exposed portion (13) comprises a top wall (131) and a rim (132) extending outwardly from the outer periphery of the top wall (131), the rim (132) abutting the outer surface of the ceiling (6) in the steady state.

3. Fire alarm device according to claim 1, wherein the projecting portion (12) comprises a bottom wall (121) and a side wall (122) connected to each other, the exposed portion (13) is connected to an end of the side wall (122) remote from the bottom wall (121), and the elastic member (3) is provided to the side wall (122) and extends outwardly from the side wall (122).

4. A fire alarm device according to claim 3, wherein the elastic member (3) comprises a supporting portion (31) and a torsion spring (32), the supporting portion (31) is provided on the side wall (122) and is rotatable relative to the side wall (122), and two torsion arms of the torsion spring (32) are respectively limited on the side wall (122) and the supporting portion (31).

5. The fire alarm device according to claim 4, wherein the supporting portion (31) includes an extension section (311) and a supporting section (312), the extension section (311) is provided to the side wall (122) and is rotatable with respect to the side wall (122), the supporting section (312) is connected to an end of the extension section (311) remote from the side wall (122), and in the stable state, the supporting section (312) abuts against an inner surface of the ceiling (6).

6. Fire alarm device according to claim 5, wherein one end of the extension (311) is connected to one end of the side wall (122) close to the bottom wall (121), and in the steady state the other end of the extension (311) extends obliquely outwards from the side wall (122) towards the ceiling (6).

7. The fire alarm device according to claim 4, wherein the projecting portion (12) further includes a fixed shaft (123) disposed on the side wall (122) and parallel to the bottom wall (121), the torsion spring (32) is sleeved on the fixed shaft (123), and the supporting portion (31) rotates around the fixed shaft (123).

8. Fire alarm device according to claim 1, wherein the number of elastic members (3) is at least two, the elastic members (3) being arranged at intervals along the circumference of the projecting portion (12).

9. Fire alarm device according to any one of claims 1-8, wherein the alarm assembly (2) comprises a PCB board (21), an inductive element (22) and an alarm element (23), wherein the inductive element (22) and the alarm element (23) are both electrically connected to the PCB board (21), at least part of the inductive element (22) protruding from the exposed portion (13) out of the mounting cavity (11);

the alarm piece (23) comprises a buzzer (231) accommodated in the installation cavity (11), and the exposed part (13) is provided with a sound outlet hole (1311) communicated with the installation cavity (11); and/or the alarm piece (23) comprises an indicator lamp (232) arranged on the exposed part (13).

10. A fire alarm device according to any one of claims 1-8, further comprising a power member (4) accommodated in the installation cavity (11), the power member (4) being electrically connected to the alarm assembly (2); and/or the number of the groups of groups,

the fire alarm device further comprises a key (5) arranged on the exposed part (13), and the key (5) is electrically connected with the alarm assembly (2).