Fire alarm bell for fire hazard

Abstract

The utility model discloses a fire fighting alarm bell, which belongs to the technical field of alarm bells and is characterized in that the outer end of a spring is connected with a shell, a rotating rod and a fixing shaft are rotatably mounted on the shell, a large gear is mounted on the fixing shaft, a small gear is rotatably mounted on the shell, and the small gear is eccentrically and rotatably connected with a transmission rod; the cover body covers the outer side of the shell and is provided with a guide frame, and a knocking rod is slidably mounted in the guide frame; a movable hole and a slot are formed in the cover body, a guide rod is inserted into the movable hole in a sliding manner, and a compression spring and a fusible metal sheet are further included. After the clockwork spring is screwed and stores energy, when a fire occurs, the fusible metal sheet is melted, the guide rod slides outwards under the elastic force of the compression spring, the limiting of the large gear is relieved, the large gear rotates along with the clockwork spring in the unscrewing process, the end of the knocking rod knocks the cover body, and the alarming effect is achieved. A full-mechanical structure is adopted, electricity is not needed, and the reliability of a fire alarm function is ensured; repeated use of the device is achieved by replacing the fusible metal sheet, the service life is guaranteed, and the maintenance cost is saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of alarm bells, in particular to a fire alarm bell. Background Art

[0002] Fire alarms are a crucial component of fire alarm systems, primarily used to sound warnings in the event of a fire or emergency, prompting personnel to evacuate quickly. They operate by receiving fire alarm signals and transmitting high-frequency audio signals through a horn, speaker, or bell, thereby providing a warning. The fire alarm is automatically activated when a fire alarm signal is detected. These fire alarm signals may include smoke or temperature alarms. Furthermore, the design specifications for fire alarms require a sound pressure level of no less than 60dB. In locations where ambient noise exceeds 60dB, the sound pressure level must be 15dB higher than the background noise level.

[0003] In short, fire alarms are important fire alarm devices that can promptly alert people to take action and ensure safety in emergency situations. However, existing technologies use traditional electronic triggering to activate power, and then the alarm sounds. However, these devices suffer from shortcomings: the entire device is composed of circuits, which are prone to aging and leakage, causing the fire alarm to fail, resulting in poor stability and unreliability. Furthermore, both the triggering and ringing processes require batteries, which deplete over time, resulting in a short lifespan. Utility Model Content

[0004] In order to solve the problems of using traditional electronic trigger-powered alarms, the entire device is composed of circuits, the circuits are prone to aging and leakage, causing the fire alarm function to fail, poor stability, and unreliable use; and both the triggering process and the ringing process require the participation of batteries, which will be exhausted after long-term use and have a short service life. The utility model provides a fire alarm.

[0005] The utility model is realized through the following technical solutions:

[0006] A fire alarm comprises a spring, a cover body and a shell; the outer end of the spring is connected to the shell, and a rotating rod connected to the inner end of the spring and a fixed shaft connected to the rotating rod are rotatably installed on the side wall of the shell, a large gear is installed on the fixed shaft, a small gear meshing with the large gear is rotatably installed on the side wall of the shell, and a transmission rod is eccentrically rotatably installed on the wheel surface of the small gear; the cover body positioning cover is arranged on the outside of the shell, and a guide frame is positioned on the inside thereof, and a knocking rod rotatably connected to the transmission rod is slidably connected in the guide frame; a movable hole is opened on the cover body, and a slot is positioned and installed at the edge of the movable hole, a guide rod capable of limiting the large gear is slidably inserted in the movable hole, and a compression spring is mounted on the guide rod for elastically supporting the guide rod in a direction away from the large gear; a fusible metal sheet capable of limiting the guide rod is inserted in the slot.

[0007] A further improvement of the present invention is that it further comprises a spring sleeve positioned and mounted inside the housing, the spring being mounted inside the spring sleeve, and the outer end of the spring being connected and mounted to the spring sleeve.

[0008] A further improvement of the present invention is that the guide rod slides through the side wall of the shell, a limit plate is provided on the guide rod, and the compression spring is elastically supported between the outer side of the shell side wall and the limit plate.

[0009] A further improvement of the present invention is that a slot for engaging with the fusible metal sheet is provided on the guide rod.

[0010] A further improvement of the present invention is that at least two latches are provided at one end of the fixed shaft close to the rotating rod, and the end of the rotating rod is provided with a socket that is engaged with the latches.

[0011] A further improvement of the present invention is that a knocking head capable of colliding and knocking the cover body is installed at one end of the knocking rod away from the transmission rod.

[0012] A further improvement of the present invention is that a threaded rod is connected and installed on the shell, and a nut is provided on the cover body and is screwed and installed with the threaded rod.

[0013] A further improvement of the present invention is that a support shaft is positioned and installed on the side wall of the shell, and the support shaft is rotatably connected to the pinion through a bearing.

[0014] A further improvement of the present invention is that a positioning hole capable of being positioned and inserted with the guide rod is opened on the wheel surface of the large gear.

[0015] A further improvement of the present invention is that mounting feet are provided at the four corners of the shell.

[0016] It can be seen from the above technical solutions that the beneficial effects of the present invention are:

[0017] Initially, the fusible metal sheet is not installed. The guide rod, supported by the elastic force of the compression spring, pushes outward along the movable hole, preventing it from contacting the large gear (i.e., separating from the positioning hole). Rotating the rotating rod tightens the mainspring, storing energy, pushing the guide rod's compression spring inward along the movable hole, causing it to engage with the large gear (the guide rod is positioned in the positioning hole). The fusible metal sheet is then inserted into the slot to limit the guide rod's outward movement. The entire device is then installed in the detection position. In the event of a fire, the high temperature melts the fusible metal sheet, releasing the axial outward restraint on the guide rod. The guide rod, under the elastic force of the compression spring, slides axially outward (along the movable hole), releasing the large gear. The large gear rotates as the mainspring automatically unwinds, driving the pinion. This in turn causes the transmission rod to drive the striking rod, which slides back and forth through the guide frame. This causes the striking rod's end to strike the housing at a high frequency, producing a sound and triggering the alarm. The overall fully mechanical structure does not require electricity, ensuring the reliability of the fire alarm function; and the device can be reused by replacing the fusible metal sheet, ensuring a long service life, saving maintenance costs, and good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for the description. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 It is a structural diagram of a specific implementation method of the utility model.

[0020] Figure 2 This is a schematic diagram of the explosion structure from the first perspective of a specific implementation method of the utility model.

[0021] Figure 3 This is a schematic diagram of the explosion structure from a second perspective of a specific implementation method of the utility model.

[0022] In the accompanying drawings: 100, housing; 101, threaded rod; 102, mounting foot; 103, support shaft; 104, shaft hole; 110, rotating rod; 111, jack; 120, spring sleeve; 130, spring; 140, cover; 141, nut; 142, movable hole; 150, guide frame; 200, trigger mechanism; 210, guide rod; 211, slot; 220, slot; 230, fusible metal sheet; 240, compression spring; 250, limit plate; 300, striking mechanism; 310, large gear; 311, fixed shaft; 312, latch; 313, positioning hole; 320, small gear; 321, bearing; 330, transmission rod; 340, striking rod; 341, hinged seat; 342, striking head. DETAILED DESCRIPTION

[0023] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings in the specific embodiments. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this patent.

[0024] like Figure 1-3 As shown, the utility model discloses a fire alarm, comprising a spring 130, a cover 140 and a rectangular parallelepiped housing 100; the outer end of the spring 130 is connected to the housing 100, and a rotating rod 110 connected to the inner end of the spring 130 and a fixed shaft 311 connected to the rotating rod 110 are rotatably mounted on one side wall of the housing 100, that is, an axial hole 104 rotatably mounted to the fixed shaft 311 is opened on the other side wall of the housing 100; a large gear 310 is mounted on the fixed shaft 311, and a small gear 320 meshing with the large gear 310 is rotatably mounted on one side wall of the housing 100, and a transmission rod 330 is eccentrically rotatably mounted on the wheel surface of the small gear 320; the cover A positioning cover 140 is disposed on the outside of the housing 100. A guide frame 150 is positioned and installed inside the cover 140. A knocking rod 340, which is rotatably connected to the transmission rod 330, is slidably connected within the guide frame 150. The knocking rod 340 is rotatably connected to the transmission rod 330 via a hinge seat 341. A movable hole 142 is formed in the cover 140, and a slot 220 is positioned and installed at the edge of the movable hole 142. A guide rod 210 capable of limiting the position of the large gear 310 is slidably inserted into the movable hole 142. The guide rod 210 is equipped with a compression spring 240 that elastically supports the guide rod 210 away from the large gear 310. A fusible metal sheet 230 capable of limiting the position of the guide rod 210 is inserted into the slot 220. A positioning hole 313 is formed on the wheel surface of the large gear 310, which is capable of positioning and inserting with the guide rod 210.

[0025] In the initial state, the fusible metal sheet 230 is not installed. Under the elastic support of the compression spring 240, the guide rod 210 is pushed outward along the movable hole 142, so that the guide rod 210 is not in contact with the large gear 310 (that is, separated from the positioning hole 313); the rotating rod 110 is rotated to drive the mainspring 130 to tighten and store energy, pushing the guide rod 210 to slide inward along the movable hole 142 due to the elastic force of the compression spring 240, so that the guide rod 210 is limitedly engaged with the large gear 310 (the guide rod 210 is positioned and inserted in the positioning hole 313), and the fusible metal sheet 230 is inserted into the slot 220 to limit the outward sliding of the guide rod 210, and the entire device is installed to the detection position. When a fire occurs, the high temperature melts the fusible metal sheet 230, releasing the axial outward limit on the guide rod 210. Guide rod 210 slides axially outward (along movable hole 142) under the elastic force of compression spring 240, thereby releasing the limit on large gear 310. Large gear 310 rotates as spring 130 automatically loosens, thereby driving small gear 320 to rotate. In turn, transmission rod 330 drives striking rod 340 to slide back and forth through guide frame 150, thereby causing the end of striking rod 340 to strike cover 140 at a high frequency, producing a sound and thus providing an alarm. The overall mechanical structure requires no electricity, ensuring the reliability of the fire alarm function. The fusible metal sheet 230 can also be replaced to enable the device to be reused, ensuring a long service life, saving maintenance costs, and improving practicality.

[0026] The fire alarm further includes a spring housing 120 positioned and mounted inside the housing 100. A spring 130 is mounted inside the spring housing 120, with its outer end connected to the spring housing 120. The spring housing 120 wraps around the spring 130, thereby protecting the spring 130 and ensuring the reliability of the tightening and loosening of the spring 130.

[0027] The guide rod 210 slides through the side wall of the housing 100. A stop plate 250 is provided on the guide rod 210. A compression spring 240 is elastically supported between the outer side wall of the housing 100 and the stop plate 250. A stop block is provided on the guide rod 210 inside the housing 100 to prevent the guide rod 210 from falling out of the housing 100. The structure is simple and easy to implement, effectively ensuring the reliability of the axial movement of the guide rod 210.

[0028] The guide rod 210 is provided with a slot 211 for engaging with the fusible metal sheet 230. The fusible metal sheet 230 is engaged with the slot 211 to limit the axial position of the guide rod 210.

[0029] The fixed shaft 311 has at least two latches 312 at one end near the rotating rod 110, and the end of the rotating rod 110 has a socket 111 that snaps into engagement with the latches 312. The fixed shaft 311 and the rotating rod 110 are locked together by the latches 312 and the socket 111, allowing them to rotate synchronously and be easily disassembled and assembled, facilitating replacement, maintenance, and assembly of various components.

[0030] Wherein, the knocking rod 340 is equipped with a knocking head 342 that can knock against the cover 140 away from one end of the transmission rod 330. The knocking head 342 of metal knocks against the cover 140 at high frequencies to realize ringing alarm.

[0031] The housing 100 is connected to a threaded rod 101, and the cover 140 is provided with a nut 141 screwed to the threaded rod 101. This ensures convenient and reliable connection and installation between the cover 140 and the housing 100, and by rotating the cover 140 (relative to the housing 100), the striking position can be flexibly changed, avoiding deformation of the cover 140 and the ringing sound caused by striking at one position.

[0032] A support shaft 103 is positioned and mounted on the side wall of the housing 100, and the support shaft 103 is rotatably connected to the pinion 320 via a bearing 321, thereby ensuring the reliability and accuracy of the rotational installation of the pinion 320.

[0033] Among them, the four corners of the housing 100 are provided with mounting feet 102. The four mounting feet 102 realize convenient and reliable installation and positioning of the entire device.

[0034] In the initial state of this fire alarm, the fusible metal sheet 230 is not installed. Under the elastic support of the compression spring 240, the guide rod 210 is pushed outward along the movable hole 142, so that the guide rod 210 is not in contact with the large gear 310 (that is, it is separated from the positioning hole 313); the rotating rod 110 is rotated to drive the mainspring 130 to tighten and store energy, pushing the guide rod 210 to slide inward along the movable hole 142 due to the elastic force of the compression spring 240, so that the guide rod 210 is limitedly engaged with the large gear 310 (the guide rod 210 is positioned and inserted in the positioning hole 313), and the fusible metal sheet 230 is inserted into the slot 220 to limit the outward sliding of the guide rod 210. The entire device is installed in the detection position. When a fire occurs, the high temperature melts the fusible metal sheet 230, releasing the axial outward limit on the guide rod 210. Guide rod 210 slides axially outward (along movable hole 142) under the elastic force of compression spring 240, thereby releasing the limit on large gear 310. Large gear 310 rotates as spring 130 automatically loosens, thereby driving small gear 320 to rotate. In turn, transmission rod 330 drives striking rod 340 to slide back and forth through guide frame 150, thereby causing the end of striking rod 340 to strike cover 140 at a high frequency, producing a sound and thus providing an alarm. The overall mechanical structure requires no electricity, ensuring the reliability of the fire alarm function. The fusible metal sheet 230 can also be replaced to enable the device to be reused, ensuring a long service life, saving maintenance costs, and improving practicality.

[0035] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0036] The terms "upper," "lower," "outer," "inner," and the like, if used in the specification and claims of the present invention and the accompanying drawings, are used to distinguish relative positions and do not necessarily define them. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present invention described herein can be implemented in sequences other than those illustrated or described herein. Furthermore, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions.

[0037] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fire alarm, characterized in that: The invention comprises a spring (130), a cover (140) and a housing (100); the outer end of the spring (130) is connected to the housing (100), a rotating rod (110) connected to the inner end of the spring (130) and a fixed shaft (311) connected to the rotating rod (110) are rotatably mounted on the side wall of the housing (100), a large gear (310) is mounted on the fixed shaft (311), a small gear (320) meshing with the large gear (310) is rotatably mounted on the side wall of the housing (100), and a transmission rod (330) is eccentrically rotatably mounted on the wheel surface of the small gear (320); a positioning cover of the cover (140) is arranged on the outside of the housing (100), A guide frame (150) is positioned and installed on the inner side thereof, and a knocking rod (340) rotatably connected to the transmission rod (330) is slidably connected in the guide frame (150); a movable hole (142) is opened on the cover body (140), and a slot (220) is positioned and installed on the edge of the movable hole (142); a guide rod (210) capable of limiting the large gear (310) is slidably inserted in the movable hole (142), and a compression spring (240) is sleeved on the guide rod (210) for elastically supporting the guide rod (210) in a direction away from the large gear (310); a fusible metal sheet (230) capable of limiting the guide rod (210) is inserted in the slot (220).

2. The fire alarm according to claim 1, characterized in that: It also includes a spring sleeve (120) positioned and installed inside the housing (100), a spring (130) installed inside the spring sleeve (120), and an outer end of the spring (130) connected to the spring sleeve (120).

3. The fire alarm according to claim 1, characterized in that: The guide rod (210) slides through the side wall of the housing (100), a limit plate (250) is provided on the guide rod (210), and the compression spring (240) is elastically supported between the outer side of the side wall of the housing (100) and the limit plate (250).

4. The fire alarm according to claim 1, characterized in that: The guide rod (210) is provided with a slot (211) for engaging with the fusible metal sheet (230).

5. The fire alarm according to claim 1, characterized in that: At least two latches (312) are provided at one end of the fixed shaft (311) close to the rotating rod (110), and a socket (111) for engaging with the latches (312) is provided at the end of the rotating rod (110).

6. The fire alarm according to claim 1, characterized in that: A knocking head (342) capable of colliding and knocking the cover body (140) is installed at one end of the knocking rod (340) away from the transmission rod (330).

7. The fire alarm according to claim 1, characterized in that: A threaded rod (101) is connected and mounted on the housing (100), and a nut (141) is provided on the cover (140) and is screwed and mounted on the threaded rod (101).

8. The fire alarm according to claim 1, characterized in that: A support shaft (103) is positioned and mounted on the side wall of the housing (100), and the support shaft (103) is rotatably connected to the pinion (320) via a bearing (321).

9. The fire alarm according to claim 1, characterized in that: A positioning hole (313) capable of being positioned and inserted into the guide rod (210) is provided on the wheel surface of the large gear (310).

10. The fire alarm according to claim 1, characterized in that: Mounting feet (102) are provided at the four corners of the housing (100).

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