Carbon film button device of electric energy meter

Abstract

The utility model discloses a carbon film button device of electric energy meter relates to electric energy meter technical field. The device includes electric energy meter casing, printed wiring board, conducting carbon film and silica gel cover, conducting carbon film is printed in the preset button position of printed wiring board (its layout is consistent with the existing wiring board, only replaces the package), and silica gel cover is inlaid in the button pillar position of casing and is equipped with conducting carbon particle, when pressing the button, conducting carbon particle and conducting carbon film contact, realize the electric signal conduction to detect the button state. The utility model dispenses with mechanical button, has reduced the cost, and carbon film has the excellent anticorrosive, conducting performance, has reduced the button failure problem, has promoted electric energy meter operation stability.

Description

Technical Field

[0001] This utility model relates to the field of electricity meter technology, and in particular to a carbon film button device for electricity meters. Background Technology

[0002] In the field of electricity meters, buttons are crucial components for enabling functions such as opening the cover and flipping the screen. Currently, both the cover opening and display buttons on electricity meters utilize traditional mechanical contact buttons, whose structure consists of a spring, a plastic cover, and brass inserts.

[0003] However, mechanical buttons have obvious drawbacks: due to their poor sealing, dust can easily get in; and in harsh environments such as high humidity and high corrosion, the metal components in the buttons are prone to corrosion, causing the buttons to jam or become damaged, resulting in button malfunction, which in turn leads to product quality problems and affects the normal operation of the electricity meter.

[0004] Carbon film is a conductive thin film made of carbon atoms. Its conductive film layer is a transparent conductive material (such as metal oxide or conductive polymer), exhibiting good conductivity and chemical stability, effectively resisting environmental corrosion, and is widely used in various fields such as industrial production and scientific research. Applying carbon film to the buttons of electricity meters is expected to solve the aforementioned defects of mechanical buttons. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, this application proposes a carbon film keypad device for electricity meters to solve the problems existing in the prior art.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0007] A carbon film button device for an electricity meter includes an electricity meter housing, a printed circuit board (PCB), a conductive carbon film, and a silicone sleeve. The PCB is disposed inside the electricity meter housing. The conductive carbon film is printed on a preset button position on the PCB. The silicone sleeve is embedded in the button support position of the electricity meter housing, and conductive carbon particles are provided on the silicone sleeve. When the button on the electricity meter housing is pressed, the conductive carbon particles contact the conductive carbon film, short-circuiting the potential on the PCB with the signal potential, thereby realizing the detection of the electricity meter button status and function.

[0008] As a further technical solution of this utility model: the layout of the printed circuit board is consistent with the layout of the existing printed circuit board of the electricity meter, except that the packaging of the preset button position is a carbon film button package.

[0009] As a further technical solution of this utility model: the outer dimension of the conductive carbon film is 1 mm larger than the size of the conductive carbon particles.

[0010] As a further technical solution of this utility model: the thickness of the conductive carbon film is 20±10μm.

[0011] As a further technical solution of this utility model: the carbon oil sheet resistance of the conductive carbon film is ≤20Ω.

[0012] As a further technical solution of this utility model: the conductive carbon film has a conductive linewidth ≥ 0.6 mm and a conductive line spacing ≥ 0.6 mm.

[0013] As a further technical solution of this utility model: the contact resistance of the conductive carbon particles is not greater than 100Ω.

[0014] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0015] 1. Significantly reduce costs: Eliminating two mechanical button components reduces raw material costs; employees insert two fewer materials during production, saving approximately 3 hours of work time per day in the DIP process, increasing daily output and reducing labor costs.

[0016] 2. Improve operational stability: The conductive carbon film has excellent anti-corrosion, anti-oxidation, anti-wear properties and chemical stability, which can effectively resist the erosion of harsh environments, reduce button failures during field use, reduce the failure rate of the power meter in the field, and improve customer satisfaction.

[0017] 3. Reliable performance: The conductive carbon film has stable conductivity, making it suitable for transmitting weak current signals. It also has better wear resistance than metal contacts and a service life of over one million cycles. Attached Figure Description

[0018] Figure 1 This is a structural diagram of the carbon film button device for an electricity meter.

[0019] Figure 2 This is a circuit diagram of the carbon film push-button device (cycle display button) for an electricity meter.

[0020] Figure 3 This is a structural diagram of the carbon film push-button device (open cover button) for an electricity meter.

[0021] Figure 4 This is a picture of an actual carbon film meter.

[0022] In the diagram: 1-Silicone sleeve, 2-Conductive carbon particles. Detailed Implementation

[0023] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] Example 1, as Figure 1 As shown, a carbon film keypad device for an electricity meter includes an electricity meter housing, a printed circuit board, a conductive carbon film, and a silicone sleeve.

[0025] The printed circuit board is located inside the housing of the energy meter, and its layout is consistent with that of existing printed circuit boards for energy meters, except that the encapsulation at the original mechanical button position is changed to a carbon film button encapsulation. The conductive carbon film is printed on the preset button position of the printed circuit board, and it has a preset pattern and meets the following parameters: the outer dimension is 1mm larger than the size of the conductive carbon particles, the thickness is 20±10μm, the carbon oil sheet resistance is ≤20Ω, the conductive line width is ≥0.6mm, and the conductive line spacing is ≥0.6mm.

[0026] The silicone sleeve is embedded in the button support position of the energy meter housing. The silicone sleeve is provided with conductive carbon particles. The contact resistance of the conductive carbon particles is not greater than 100Ω, and their position is adapted to the preset pattern of the conductive carbon film.

[0027] When the button on the energy meter housing is pressed, the conductive carbon particles on the silicone sleeve come into contact with the conductive carbon film on the printed circuit board, short-circuiting the GND potential on the printed circuit board with the signal potential, thereby lowering the potential of the program pin of the energy meter chip, realizing the detection of the energy meter button status and function. Its working principle is the same as that of a mechanical button.

[0028] On the printed circuit board of the electricity meter, a conductive carbon film with a specific pattern (i.e., a preset pattern) is printed at the original mechanical button position. The outer size of the conductive carbon film is 1 mm larger than the conductive carbon particles of the silicone sleeve on the button support of the electricity meter housing. The thickness is controlled at 20±10μm, the carbon oil sheet resistance is ≤20Ω, and the conductive line width and conductive line spacing are both ≥0.6mm.

[0029] Install the silicone sleeve with embedded conductive carbon particles (contact resistance ≤100Ω) on the button support position of the electricity meter housing, ensuring that the conductive carbon particles correspond to the preset pattern position of the conductive carbon film.

[0030] When the button on the electricity meter casing is pressed, the conductive carbon particles on the silicone sleeve make close contact with the conductive carbon film on the circuit board, shorting the GND potential from the signal potential. The electricity meter chip detects the change in pin potential, thereby recognizing the button operation and enabling functions such as opening the cover and flipping the screen.

[0031] After testing in environments with a high temperature of 85℃ and a humidity of 85% and verification with millions of products, the carbon film keypad device can operate reliably and meet the technical specifications of electricity meters.

[0032] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

[0033] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment have been appropriately combined to form other embodiments that are easy for those skilled in the art to understand.

Claims

1. A carbon film button device for an electricity meter, comprising an electricity meter housing, a printed circuit board, a conductive carbon film, and a silicone sleeve; wherein the printed circuit board is disposed inside the electricity meter housing, and the conductive carbon film is printed on the printed circuit board at a preset button position, characterized in that, The silicone sleeve is embedded in the button support position of the energy meter housing, and the silicone sleeve is provided with conductive carbon particles; when the button of the energy meter housing is pressed, the conductive carbon particles come into contact with the conductive carbon film, causing the potential on the printed circuit board to be short-circuited with the signal potential, thereby realizing the detection of the energy meter button status and function.

2. The apparatus according to claim 1, characterized in that, The preset button position is encapsulated using a carbon film button encapsulation.

3. The apparatus according to claim 1, characterized in that, The outer dimensions of the conductive carbon film are 1 mm larger than the dimensions of the conductive carbon particles.

4. The apparatus according to claim 1, characterized in that, The thickness of the conductive carbon film is 20±10μm.

5. The apparatus according to claim 1, characterized in that, The sheet resistance of the conductive carbon film is ≤20Ω.

6. The apparatus according to claim 1, characterized in that, The conductive carbon film has a conductive linewidth ≥ 0.6 mm and a conductive line spacing ≥ 0.6 mm.

7. The apparatus according to claim 1, characterized in that, The contact resistance of the conductive carbon particles is no greater than 100Ω.

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