Self-powered intelligent door lock based on piezoelectric ceramics

Abstract

The application discloses a self-powered intelligent door lock based on piezoelectric ceramics, wherein a driving gear is sleeved on a handle rotating shaft, rotates along with the rotation of a handle handlebar, and then drives a plurality of piezoelectric ceramic power generation sheets in a piezoelectric ceramic power generation module to relatively move with a fixed outer ring, piezoelectric ceramic wafers in each piezoelectric ceramic power generation sheet are deformed under the action of a power generation sheet magnet and an outer ring magnet, electric energy is generated and output to a battery module for storage. The application converts mechanical energy in the door lock operation process into electric energy, realizes self-power supply, reduces the dependence on external power supply, prolongs the service life of the battery, and reduces the environmental impact.

Description

Technical Field

[0001] This invention belongs to the field of smart door lock technology, and more specifically, relates to a self-powered smart door lock based on piezoelectric ceramics. Background Technology

[0002] Smart locks are a core component of modern access control and security systems, widely used in residences, offices, and commercial spaces to enhance security and convenience. These locks typically rely on external power sources or built-in batteries to support functions such as remote control and biometric identification. However, existing smart locks face the problem of insufficient power supply; they fail when the batteries are depleted, increasing security risks and requiring frequent battery replacements, thus increasing maintenance costs and environmental burden. Furthermore, the installation locations for smart locks are limited, especially in older buildings and remote areas where access to power is difficult, resulting in high maintenance costs and implementation challenges. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a self-powered smart door lock based on piezoelectric ceramics. By converting the mechanical energy during the door lock operation process into electrical energy, it achieves self-powering, reduces dependence on external power sources, extends battery life, and reduces environmental impact.

[0004] To achieve the above-mentioned objectives, the present invention provides a self-powered smart door lock based on piezoelectric ceramics, comprising a lock body, a shell, a handle, the handle including a grip rod and a handle shaft, and further including a drive gear, a piezoelectric ceramic power generation module, and a battery module, wherein:

[0005] The drive gear is mounted on the handle shaft and rotates as the handle bar rotates;

[0006] The piezoelectric ceramic power generation module includes a fixed shaft, a driven gear, a power generation core, N piezoelectric ceramic power generation plates, a fixed outer ring, and M outer ring magnets, wherein:

[0007] The fixed shaft is fixed to the housing, and the driven gear is mounted on the fixed shaft and meshes with the driving gear.

[0008] The core of the generator is a circular ring, which is fitted onto a fixed shaft and fixedly connected to the driven gear.

[0009] N piezoelectric ceramic power generating plates are fixed on the outside of the core of the power generating body. Each piezoelectric ceramic power generating plate includes a cantilever beam, a piezoelectric ceramic wafer and a power generating plate magnet. The cantilever beam is fixed on the core of the power generating body, and the piezoelectric ceramic wafer and the power generating plate magnet are respectively mounted on the cantilever beam.

[0010] The fixed outer ring is fixed on the outer shell and is aligned with the axis of the core of the generator. Its inner radius is greater than the distance from the outer end of the cantilever beam to the axis. M outer ring magnets are installed inside the fixed outer ring, and there is a gap between the outer ring magnets and the piezoelectric ceramic generator.

[0011] The battery module is fixed on the housing, and its input terminal is electrically connected to the output terminal of the piezoelectric ceramic chip in each piezoelectric ceramic power generation piece. The output terminal of the battery module is connected to the power supply terminal of the smart door lock.

[0012] When the handle is pressed, the driving gear rotates in one direction, which in turn drives N piezoelectric ceramic generators to rotate through the driven gear. These generators move relative to the fixed outer ring. The suspension beam in each piezoelectric ceramic generator deforms under the action of the generator magnet and the outer ring magnet, causing the piezoelectric ceramic wafer to vibrate mechanically, generating electrical energy and outputting it to the battery module for storage.

[0013] This invention is a self-powered smart door lock based on piezoelectric ceramics. An active gear is mounted on the handle shaft, which rotates as the handle lever rotates. This drives several piezoelectric ceramic power generation plates in the piezoelectric ceramic power generation module to move relative to the fixed outer ring. The piezoelectric ceramic chip in each piezoelectric ceramic power generation plate deforms under the action of the power generation plate magnet and the outer ring magnet, generating electrical energy and outputting it to the battery module for storage.

[0014] The present invention has the following beneficial effects:

[0015] 1) This invention uses piezoelectric ceramic technology to convert the mechanical energy during the door lock operation into electrical energy and store it in the battery module to supply the power required by the smart door lock. This ensures that the door lock continues to operate when there is no external power source, reduces reliance on traditional batteries, effectively prevents the door lock from failing to open due to depletion of energy storage, and reduces maintenance costs.

[0016] 2) The piezoelectric ceramic power generation module of the present invention is built into the smart door lock. The ratchet mechanism connected to the door handle is activated by the door opening and closing action, without the need for additional operation.

[0017] 3) Compared with the prior art, the present invention enhances the continuous power supply capability, is suitable for areas without power facilities, reduces environmental pollution, and achieves both economic and ecological benefits. Attached Figure Description

[0018] Figure 1 This is a structural diagram of a specific embodiment of the self-powered smart door lock based on piezoelectric ceramics of the present invention;

[0019] Figure 2 This is a perspective view of the self-powered smart door lock based on piezoelectric ceramics according to the present invention;

[0020] Figure 3 This is a front view of the piezoelectric ceramic power generation module in this invention;

[0021] Figure 4 This is a perspective view of the piezoelectric ceramic power generation module in this invention;

[0022] Figure 5 This is a structural diagram of the piezoelectric ceramic generator in this invention. Detailed Implementation

[0023] The specific embodiments of the present invention will now be described with reference to the accompanying drawings to enable those skilled in the art to better understand the invention. It should be particularly noted that in the following description, detailed descriptions of known functions and designs that might obscure the main content of the invention will be omitted here.

[0024] Example

[0025] Figure 1 This is a structural diagram of a specific embodiment of the self-powered smart door lock based on piezoelectric ceramics according to the present invention. Figure 2 This is a perspective view of the self-powered smart door lock based on piezoelectric ceramics according to the present invention. To more clearly illustrate the structure of the invention, wires have been omitted from the accompanying drawings of this embodiment. Figure 1 and Figure 2 As shown, the self-powered smart door lock based on piezoelectric ceramics of this invention includes a conventional lock body 1, a shell 2, and a handle 3. The handle 3 includes a grip rod 31 and a handle shaft 32. To achieve self-powering, this invention also includes a drive gear 4, a piezoelectric ceramic power generation module 5, and a battery module 6. Each component will be described in detail below.

[0026] The drive gear 4 is mounted on the handle shaft 32 and rotates as the handle lever 31 rotates. In this embodiment, the drive gear 4 is equipped with a ratchet as the driving element, which together with the transmission plate on the bolt in the lock body 1 forms a cam mechanism to realize the opening and closing of the door lock.

[0027] Figure 3 This is a front view of the piezoelectric ceramic power generation module in this invention. Figure 4 This is a perspective view of the piezoelectric ceramic power generation module of this invention. (See diagram below.) Figure 3 and Figure 4 As shown, the piezoelectric ceramic power generation module 5 of this invention includes a fixed shaft 51, a driven gear 52, a power generation core 53, N piezoelectric ceramic power generation plates 54, a fixed outer ring 55, and M outer ring magnets 56, wherein:

[0028] The fixed shaft 51 is fixed on the housing 2, and the driven gear 52 is mounted on the fixed shaft 51 and meshes with the driving gear 4.

[0029] The core 53 of the generator is a ring, which is fitted on the fixed shaft 51 and fixedly connected to the driven gear 52.

[0030] N piezoelectric ceramic power generating plates 54 are fixed on the outside of the power generating core 53. Figure 5 This is a structural diagram of the piezoelectric ceramic power generator in this invention. (See diagram below.) Figure 5 As shown, each piezoelectric ceramic power generation piece 54 includes a cantilever beam 541, a piezoelectric ceramic wafer 542, and a power generation piece magnet 543, wherein the cantilever beam 541 is fixed on the power generation core 53, and the piezoelectric ceramic wafer 542 and the power generation piece magnet 543 are respectively mounted on the cantilever beam 541.

[0031] In this embodiment, the core 53 of the power generator has N openings. Screws pass through the openings from the inside of the core 53 and are fixedly connected to the lower end of the cantilever beam 541. The number N of the piezoelectric ceramic power generator can be determined according to actual needs, and the preferred value range is [6, 12]. In this embodiment, N = 8. To increase the magnetic effect, each piezoelectric ceramic power generator 54 has two piezoelectric ceramic wafers 542 and two power generator magnets 543, which are installed on the front and back sides of the cantilever beam 541, respectively.

[0032] The outer ring 55 is fixed to the outer shell 2, and its inner radius is greater than the distance from the outer end of the cantilever beam 541 to the axis, coinciding with the axis of the generator core 53. M outer ring magnets 56 are installed inside the outer ring 55, with gaps between the outer ring magnets 56 and the piezoelectric ceramic generator 54. Research has shown that the preferred value range for the number M of the outer ring magnets 56 is [2N, 3N], and in this embodiment, M = 20. Regarding the fixing method, four raised circular holes are provided on the outer side of the outer ring 55, and screws are used to pass through these holes to fix the outer ring 55 to the outer shell 2.

[0033] The battery module 6 is fixed on the housing 2, and its input terminal is electrically connected to the output terminal of the piezoelectric ceramic chip 542 in each piezoelectric ceramic power generation piece 54. The output terminal of the battery module 6 is connected to the power supply terminal of the smart door lock.

[0034] Piezoelectric ceramics are materials exhibiting the piezoelectric effect. When pressure or tension is applied, charge separation occurs, creating a voltage difference. This phenomenon is known as the piezoelectric effect, which can be used to convert mechanical energy into electrical energy, thus generating electricity. Specifically, in this invention, when the handle lever 31 is pressed, the driving gear 4 rotates, which in turn drives N piezoelectric ceramic power generating plates 54 to rotate via the driven gear 52. These plates move relative to the fixed outer ring 55. The suspension beam 541 in each piezoelectric ceramic power generating plate 54 deforms under the action of the power generating plate magnet 543 and the outer ring magnet 56, causing the piezoelectric ceramic wafer 542 to vibrate mechanically, generating electrical energy which is then output to the battery module for storage.

[0035] Although the illustrative specific embodiments of the present invention have been described above to enable those skilled in the art to understand the invention, it should be understood that the invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the invention as defined and determined by the appended claims, and all inventions utilizing the concept of the present invention are protected.

Claims

1. A self-powered smart door lock based on piezoelectric ceramics, comprising a lock body (1), a shell (2), and a handle (3), wherein the handle (3) includes a grip rod (31) and a handle pivot (32), characterized in that, It also includes a drive gear (4), a piezoelectric ceramic power generation module (5), and a battery module (6), wherein: The drive gear (4) is mounted on the handle shaft (32) and rotates as the handle lever (31) rotates; The piezoelectric ceramic power generation module (5) includes a fixed shaft (51), a driven gear (52), a power generation core (53), N piezoelectric ceramic power generation plates (54), a fixed outer ring (55), and M outer ring magnets (56), wherein: The fixed shaft (51) is fixed on the outer casing (2), and the driven gear (52) is mounted on the fixed shaft (51) and meshes with the driving gear (4); The core (53) of the generator is a ring, which is fitted on the fixed shaft (51) and fixedly connected to the driven gear (52); N piezoelectric ceramic power generating plates (54) are fixed on the outside of the power generating core (53). Each piezoelectric ceramic power generating plate (54) includes a cantilever beam (541), a piezoelectric ceramic wafer (542), and a power generating plate magnet (543). The cantilever beam (541) is fixed on the power generating core (53), and the piezoelectric ceramic wafer (542) and the power generating plate magnet (543) are respectively mounted on the cantilever beam (541). The fixed outer ring (55) is fixed on the outer shell (2) and has the same axis as the core of the generator (53). Its inner radius is greater than the distance from the outer end of the cantilever beam (541) to the axis. M outer ring magnets (56) are installed inside the fixed outer ring (55), and there is a gap between the outer ring magnets (56) and the piezoelectric ceramic generator (54). The battery module (6) is fixed on the housing (2), and its input terminal is electrically connected to the output terminal of the piezoelectric ceramic chip (542) in each piezoelectric ceramic power generation chip (54). The output terminal of the battery module (6) is connected to the power supply terminal of the smart door lock. When the handle lever (31) is pressed, the driving gear (4) rotates in one direction, which drives N piezoelectric ceramic power generation plates (54) to rotate through the driven gear (52), and they move relative to the fixed outer ring (55). The suspension beam (541) in each piezoelectric ceramic power generation plate (54) is deformed under the action of the power generation plate magnet (543) and the outer ring magnet (56), which causes the piezoelectric ceramic wafer (542) to vibrate mechanically, generate electrical energy and output it to the battery module (6) for storage.

2. The self-powered smart door lock according to claim 1, characterized in that, The active gear (4) is equipped with a ratchet as an active component, which together with the transmission plate on the lock tongue in the lock body (1) forms a cam mechanism.

3. The self-powered smart door lock according to claim 1, characterized in that, The generator core (53) has N openings, and screws pass through the openings from the inside of the generator core (53) and are fixedly connected to the lower end of the cantilever beam (541).

4. The self-powered smart door lock according to claim 1, characterized in that, The number N of the piezoelectric ceramic power generating sheet (54) ranges from [6, 12].

5. The self-powered smart door lock according to claim 1, characterized in that, Each piezoelectric ceramic power-generating sheet (54) contains two piezoelectric ceramic wafers (542) and two power-generating sheet magnets (543), which are respectively installed on the front and back sides of the cantilever beam (541).

6. The self-powered smart door lock according to claim 1, characterized in that, The number M of the outer ring magnets (56) ranges from [2N, 3N].

7. The self-powered smart door lock according to claim 1, characterized in that, The outer ring (55) has four raised holes on its outer side. Screws are used to fix the outer ring (55) to the outer shell (2) through the holes.

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