Ultrathin alarm

Abstract

The utility model provides an ultrathin alarm, which relates to the technical field of alarms and comprises a shell and a piezoelectric plate. A first stepped groove is formed in the bottom surface of the shell; a second stepped groove is formed in the groove bottom of the first stepped groove; the first stepped groove and the second stepped groove are coaxially arranged; a sounding hole is formed in the groove bottom of the second stepped groove in a penetrating manner; the groove bottom of the first stepped groove is provided with a positioning convex ring protruding downwards. The piezoelectric plate is placed in the first stepped groove, the upper end face of the piezoelectric plate abuts against the lower end face of the positioning convex ring, the lower end face of the piezoelectric plate is flush with the lower end face of the shell, and the outer circumferential wall of the piezoelectric plate is adhered to the inner circumferential wall of the shell through an adhesive. The ultra-thin alarm has the advantages that the piezoelectric patch is flush with the shell, and an original cover body structure is omitted, so that the structure is simpler, the thickness is lighter and thinner, lead transmission is more convenient, and meanwhile, the production cost of the whole alarm is also greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of alarm technology, and more specifically, to an ultra-thin alarm. Background Technology

[0002] An alarm is an electro-acoustic conversion device, commonly used in indoor safety alarms such as carbon monoxide alarms and smoke alarms. Its working principle is as follows: piezoelectric material is attached to a metal sheet. When a voltage is applied to the two ends of the piezoelectric material and the metal sheet, the sounder will undergo mechanical deformation and produce a sound due to the reverse voltage effect.

[0003] Existing alarms typically consist of a housing, a cover, and a piezoelectric element. The piezoelectric element is sealed inside the housing by the cover, and the leads on the piezoelectric element are transferred to the connecting contacts on the outside of the cover via a circuit board on the cover. The signals are then transmitted to external devices through the contacts on the cover.

[0004] Existing alarm systems are relatively large in size, making installation quite noticeable, and their structure is relatively complex, resulting in higher overall costs. Utility Model Content

[0005] The technical problem this invention aims to solve is that existing alarms are large in size, complex in structure, and expensive. To overcome the above-mentioned defects of the prior art, this invention provides a method in which the piezoelectric sheet is flush with the housing, eliminating the original cover structure, reducing the thickness and overall volume to make the structure simpler, and making lead wire transmission more convenient, while also greatly reducing production costs.

[0006] To achieve the purpose of this utility model, the following technical solution is adopted:

[0007] An ultra-thin alarm includes a housing and a piezoelectric element. The housing has a first stepped groove on its bottom surface and a second stepped groove at the bottom of the first stepped groove. The first and second stepped grooves are coaxial. A sound-emitting hole is passed through the bottom of the second stepped groove. A downwardly protruding positioning ring is provided on the bottom of the first stepped groove. The piezoelectric element is placed in the first stepped groove, with its upper end face abutting against the lower end face of the positioning ring, and its lower end face flush with the bottom surface of the housing. The outer peripheral wall of the piezoelectric element is bonded to the inner peripheral wall of the housing using an adhesive. This ultra-thin alarm, by making the piezoelectric element flush with the housing, eliminates the original cover structure, resulting in a simpler structure, thinner profile, smaller size, and more direct and convenient wire transmission. It also significantly reduces the overall production cost of the alarm.

[0008] Preferably, the housing includes an upper cylinder and a lower cylinder coaxially connected; the diameter of the upper cylinder is smaller than that of the lower cylinder; the first stepped groove and the second stepped groove are coaxially arranged in a cylindrical shape, with the first stepped groove located on the lower cylinder and the second stepped groove located on the upper cylinder. The two cylinders facilitate the mating of the piezoelectric element, as well as its placement, and further provide space for sound generation.

[0009] Preferably, the inner peripheral wall of the positioning protrusion is connected to and vertically aligned with the inner peripheral wall of the second stepped groove. This structure further facilitates integral molding and also makes the overall structure simpler and easier to manufacture.

[0010] Preferably, the piezoelectric sheet includes a substrate and a ceramic sheet disposed on the substrate; the substrate and the ceramic sheet are coaxially arranged, the substrate abuts against the positioning protrusion, and a first lead is connected to the substrate; at least one second lead is connected to the ceramic sheet. The piezoelectric sheet allows the leads to be directly led out, eliminating the need for transmission and connection from the cover, further saving costs associated with the cover and its connecting plate.

[0011] Preferably, a positioning block is integrally formed at the outer edge of the bottom surface of the housing; the positioning block has several lead wire slots arranged at intervals and with their openings facing downwards; each lead wire slot is used to position one lead wire, and the lead wire is fixed in the lead wire slot by adhesive. The lead wire slots on the positioning block further facilitate the fixing of the lead wires, ensuring that the lead wires are led out neatly and preventing the lead wires from becoming disordered.

[0012] Preferably, the outer peripheral wall of the housing is symmetrically provided with connecting lugs; each connecting lug is provided with a connecting hole for installation and a positioning socket for positioning and mating with external equipment. The connecting lugs facilitate the installation of the housing onto external equipment, the connecting holes facilitate connection and installation, and the positioning sockets facilitate the accurate positioning of the connection between the two.

[0013] Preferably, the lower end face of the connecting hole is provided with a first step for engaging with the connecting screw; the upper end face of the connecting hole is provided with a second step for engaging with external equipment. The second step ensures that the surface of the connecting lug fits snugly against the surface of the external equipment. The first step facilitates the locking and limiting of the connecting screw, while the second step facilitates the fit with the external equipment, improving the installation compatibility.

[0014] Preferably, the connecting lug extends to the inner side of the outer edge of the housing, and the bottom surface of the connecting lug protrudes to form a positioning step with the bottom surface of the housing. The positioning step allows for better integration with external devices and also provides space for the piezoelectric element to generate electricity.

[0015] In summary, the advantages of this utility model are that the ultra-thin alarm device has the piezoelectric sheet flush with the housing, eliminating the original cover structure, making the structure simpler, thinner, and smaller in size, and the lead wire transmission is more direct and convenient, while also greatly reducing the overall production cost of the alarm device. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of the front of the ultra-thin alarm device of this utility model.

[0017] Figure 2 This is a schematic diagram of the structure on the back of the ultra-thin alarm device of this utility model.

[0018] Figure 3 This is a cross-sectional view of the ultra-thin alarm device of this utility model.

[0019] Figure 4 This is a schematic diagram of the shell structure of this utility model.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Housing; 11. Upper cylinder; 12. Lower cylinder; 13. Positioning block; 14. Lead wire slot; 15. Connecting lug; 151. Connecting hole; 152. Positioning insertion hole; 153. First step; 154. Second step; 16. Positioning step; 2. Piezoelectric element; 21. Substrate; 211. First lead wire; 22. Ceramic sheet; 221. Second lead wire; 3. First stepped groove; 4. Second stepped groove; 5. Sound hole; 6. Positioning protrusion ring. Detailed Implementation

[0022] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0023] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0024] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0025] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0026] like Figures 1 to 4 As shown, an ultra-thin alarm includes a housing 1 and a piezoelectric element 2. The housing 1 includes an upper cylinder 11 and a lower cylinder 12 arranged coaxially. The diameter of the upper cylinder 11 is smaller than that of the lower cylinder 12. A cylindrical first stepped groove 3 is provided on the bottom surface of the housing 1. A cylindrical second stepped groove 4 is provided at the bottom of the first stepped groove 3. The first stepped groove 3 and the second stepped groove 4 are coaxially arranged, with the first stepped groove 3 located inside the lower cylinder 12 and the second stepped groove 4 located inside the upper cylinder 11. The two cylinders facilitate the cooperation of the piezoelectric element 2, facilitate the placement of the piezoelectric element 2, and further facilitate providing space for the piezoelectric element 2 to generate sound. A sound-emitting hole 5 is provided through the center of the bottom of the second-step groove 4; a downward-protruding positioning ring 6 is provided on the bottom of the first-step groove 3; the piezoelectric sheet 2 is placed in the first-step groove 3, and the piezoelectric sheet 2 flatly abuts against the positioning ring 6, making the piezoelectric sheet 2 flush with the bottom surface of the housing 1, and the outer peripheral wall of the piezoelectric sheet 2 is bonded to the inner peripheral wall of the housing 1 with adhesive. This ultra-thin alarm makes the piezoelectric sheet 2 flush with the housing 1, eliminating the original cover structure, making the structure simpler, thinner, and easier to transmit wires, while also greatly reducing the overall production cost of the alarm.

[0027] like Figures 2 to 4 As shown, the inner peripheral wall of the positioning protrusion 6 is connected to and vertically aligned with the inner peripheral wall of the second stepped groove 4. That is, the diameter of the positioning protrusion 6 is the same as the diameter of the second stepped groove 4, and the upper end of the inner peripheral wall of the positioning protrusion 6 is connected to the lower end of the inner peripheral wall of the second stepped groove 4, forming a single cylindrical inner peripheral wall. This structure further facilitates integral molding and also makes the entire structure simpler and easier to manufacture.

[0028] like Figure 2 and Figure 3As shown, the piezoelectric sheet 2 includes a substrate 21 and a ceramic sheet 22 disposed on the substrate 21; the substrate 21 and the ceramic sheet 22 are coaxially arranged, the substrate 21 abuts against the positioning protrusion 6, and a first lead 211 is connected to the substrate 21; at least one second lead 221 is connected to the ceramic sheet 22. The piezoelectric sheet 2 allows the leads to be directly led out, eliminating the need for transmission and connection from the cover, further saving costs on the cover and the connecting plate on the cover.

[0029] like Figures 1 to 4 As shown, a positioning block 13 is integrally formed on the outer edge of the bottom surface of the housing 1; the positioning block 13 is provided with a plurality of lead wire slots 14 arranged at intervals and with their openings facing downwards; each lead wire slot 14 is used to position one lead wire, and the lead wire is fixed in the lead wire slot 14 by adhesive. The lead wire slots 14 on the positioning block 13 further facilitate the fixing of the lead wire, ensuring that the lead wire is led out neatly and preventing the lead wire from becoming disordered.

[0030] like Figures 1 to 4 As shown, the outer peripheral wall of the housing 1 is integrally formed and symmetrically provided with connecting lugs 15; each connecting lug 15 is provided with a connecting hole 151 for installation and a positioning insertion hole 152 for positioning and mating with external equipment. The connecting lugs 15 facilitate the installation of the housing 1 onto external equipment, the connecting holes 151 facilitate connection and installation, and the positioning insertion holes 152 facilitate the accurate positioning of the connection between the two. The lower end of the connecting hole 151 is provided with a first step 153 for mating with connecting screws; the upper end surface of the connecting hole 151 is provided with a second step 154 ​​for mating with external equipment, and the second step 154 ​​ensures that the surface of the connecting lug 15 is in close contact with the surface of the external equipment. The first step 153 facilitates the locking and limiting of the connecting screws, and the second step 154 ​​facilitates the close contact with the external equipment, improving the installation compatibility. The connecting lugs 15 extend to the inner side of the outer edge of the housing 1, and the bottom surface of the connecting lugs 15 protrudes to form a positioning step 16 with the bottom surface of the housing 1. The positioning step 16 allows for better integration with external equipment and also provides space for the piezoelectric element 2 to generate electricity.

[0031] The advantages of this invention are that the piezoelectric element 2 is flush with the housing 1, eliminating the original cover structure, making the structure simpler, thinner, and easier to transmit wires, while also greatly reducing the overall production cost of the alarm.

[0032] In the description of the embodiments of this application, it should be noted that the terms "inner" and "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0033] In the description of this application, the references to terms such as "an embodiment," "some embodiments," "in this embodiment," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0034] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An ultra-thin alarm, characterized in that, The application relates to a piezoelectric sounder, which comprises a shell (1) and a piezoelectric sheet (2); the bottom surface of the shell (1) is provided with a first stepped groove (3); the groove bottom of the first stepped groove (3) is provided with a second stepped groove (4); the first stepped groove (3) and the second stepped groove (4) are coaxially arranged; the groove bottom of the second stepped groove (4) is provided with a sound emitting hole (5); the groove bottom of the first stepped groove (3) is provided with a downwardly protruding positioning convex ring (6); the piezoelectric sheet (2) is arranged in the first stepped groove (3), the upper end surface of the piezoelectric sheet (2) is abutted against the lower end surface of the positioning convex ring (6), the lower end surface of the piezoelectric sheet (2) is flush with the lower end surface of the shell (1), and the outer peripheral wall of the piezoelectric sheet (2) is adhered to the inner peripheral wall of the shell (1) through an adhesive.

2. The ultra-thin alarm of claim 1, wherein, The shell (1) comprises an upper cylinder (11) and a lower cylinder (12) which are coaxially arranged; the diameter of the upper cylinder (11) is smaller than that of the lower cylinder (12); the first stepped groove (3) and the second stepped groove (4) are coaxially arranged in a cylindrical shape, the first stepped groove (3) is arranged on the lower cylinder (12), and the second stepped groove (4) is arranged on the upper cylinder (11).

3. The ultra-thin alarm of claim 2, wherein, The inner peripheral wall of the positioning convex ring (6) is connected with the inner peripheral wall of the second stepped groove (4) and is arranged in vertical alignment.

4. The ultra-thin alarm of claim 1, wherein, The piezoelectric sheet (2) comprises a substrate (21) and a ceramic sheet (22) arranged on the substrate (21); the substrate (21) and the ceramic sheet (22) are coaxially arranged, the substrate (21) is abutted against the positioning convex ring (6), the substrate (21) is connected with a first lead wire (211), and the ceramic sheet (22) is connected with at least one second lead wire (221).

5. The ultra-thin alarm of claim 4, wherein, An integral positioning clamping block (13) is arranged at the outer edge of the bottom surface of the shell (1); a plurality of lead wire clamping grooves (14) which are arranged at intervals and have downwardly distributed openings are arranged on the positioning clamping block (13); each lead wire clamping groove (14) is used for positioning a lead wire, and the lead wire is fixed in the lead wire clamping groove (14) through an adhesive.

6. The ultra-thin alarm of claim 1, wherein, Symmetrical connecting lugs (15) are arranged on the outer peripheral wall of the shell (1); a connecting hole (151) used for mounting and a positioning insertion hole (152) used for positioning cooperation with external equipment are respectively arranged on each connecting lug (15).

7. The ultra-thin alarm of claim 6, wherein, A first step (153) used for cooperation with a connecting screw is arranged on the lower end surface of the connecting hole (151); a second step (154) used for cooperation with external equipment is arranged on the upper end surface of the connecting hole (151), and the surface of the connecting lug (15) is ensured to be combined with the surface of external equipment through the second step (154).

8. The ultra-thin alarm of claim 6, wherein, The connecting lug (15) extends to the inner side of the outer edge of the shell (1), and the bottom surface of the connecting lug (15) protrudes to form a positioning step (16) with the bottom surface of the shell (1).

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