Key structure and electric energy meter

Abstract

The utility model discloses a button structure and electric energy meter relates to electric energy meter technical field, the button structure includes casing, button pad and button body, the casing is equipped with the through hole, the button pad includes the fixed part and the elastic part, the fixed part is connected with the elastic part peripheral surface, the fixed part is connected with the casing, the elastic part is equipped with the deformation groove, and the deformation groove is equipped with the through hole. The inner wall of the deformation groove is provided with an exhaust part penetrating through the elastic part, the key body movably penetrates through the through hole and can abut against the elastic part, when the key body presses the elastic part, the space in the deformation groove collapses and is reduced, and air in the deformation groove can be timely exhausted to the outside through the exhaust part by arranging the exhaust part, so that the key body is prevented from being damaged, and the service life of the key body is prolonged. The situation that the pressing resistance of the key body is increased due to the fact that the air pressure in the deformation groove is too large is avoided, and therefore the pressing experience when a user presses the key body is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric energy meters, in particular to a key structure and an electric energy meter. Background Art

[0002] An electric energy meter is an instrument used to measure the electric energy consumed in a circuit. It is an essential electronic component for homes and businesses. Waterproofing and insect-proofing are the key to extending the service life of the electric energy meter, and waterproofing of the buttons is even more important. The electric energy meter buttons are in their initial free state most of the time. They only switch to the second state or position when an external force acts on the buttons to force the elastic element inside the buttons to deform. Once the external force is removed, the switch returns to its initial position. In the prior art, most of these elastic elements are springs. The gaps in the springs greatly reduce the waterproof performance of the electric energy meter. In order to improve the waterproof performance of the electric energy meter, a soft rubber pad is generally used to replace the spring. The soft rubber pad is provided with a cavity, which is a closed space. When the soft rubber pad is deformed by the button, the air pressure in the cavity increases, resulting in an increase in the pressing resistance of the button, affecting the button pressing experience. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems in the prior art. To this end, the present invention proposes a key structure that can reduce pressing resistance.

[0004] The utility model also provides an electric energy meter with the key structure.

[0005] According to the first embodiment of the present invention, the key structure is used for an electric energy meter, and the key structure includes:

[0006] A housing having a through hole;

[0007] A button body is inserted into the through hole;

[0008] The key pad includes an elastic portion and a fixed portion, wherein the fixed portion is connected to the outer peripheral surface of the elastic portion, and the fixed portion is connected to the shell. One end of the key body abuts against the elastic portion. A deformation groove is provided on the side of the elastic portion away from the key body. The deformation groove has an exhaust portion that passes through the elastic portion. When one end of the key body presses the elastic portion, the air in the deformation groove is discharged through the exhaust portion.

[0009] The key structure according to one embodiment of the present invention has at least the following beneficial effects:

[0010] By providing an exhaust portion connected to the outside world on the deformation groove, when the button body presses the elastic part, the deformation groove is deformed, and the air in the deformation groove can be discharged in time, so that the air pressure in the deformation groove is relative to the external atmospheric pressure, which can reduce the pressing resistance of the button body and thus improve the user's pressing experience when pressing the button body.

[0011] According to some embodiments of the present invention, a plurality of exhaust portions are provided, and the plurality of exhaust portions are spaced apart along the circumference of the elastic portion.

[0012] According to some embodiments of the present invention, the deformation groove has an opening, and a conductive portion is provided on a side of the elastic portion facing away from the button body, and the conductive portion can close a circuit on a circuit board of the electric energy meter.

[0013] According to some embodiments of the present invention, a sealing groove is formed between the fixing portion and the elastic portion, and a first annular protrusion is provided on the inner side of the shell. Along the axial direction of the through hole, the first annular protrusion is arranged around the outer circumference of the through hole, and one end of the first annular protrusion is accommodated in the sealing groove and can abut against the side wall of the sealing groove.

[0014] According to some embodiments of the present invention, a second annular protrusion is provided on the outer side of the shell, and along the axial direction of the through hole, the second annular protrusion is arranged around the outer circumference of the through hole.

[0015] According to some embodiments of the present invention, the button body includes a pressing portion and a triggering portion connected to the pressing portion, the triggering portion is penetrated by the through hole and can abut against the elastic portion, and the pressing portion blocks the through hole.

[0016] According to some embodiments of the present invention, the trigger portion is provided with a limiting protrusion, and the limiting protrusion can abut against the peripheral edge of the through hole on a side away from the pressing portion.

[0017] According to some embodiments of the present invention, the pressing portion and the triggering portion are an integrated structure.

[0018] According to some embodiments of the present invention, a reinforcing rib is provided between the pressing portion and the triggering portion.

[0019] The electric energy meter according to the embodiment of the second aspect of the present utility model includes the key structure described in the above embodiment.

[0020] The compressor according to one embodiment of the present invention has at least the following beneficial effects:

[0021] The key structure of the first aspect embodiment is adopted. By setting an exhaust part connected to the outside world on the deformation groove, when the key body presses the elastic part, the deformation groove is deformed, and the air in the deformation groove can be discharged in time to make the air pressure in the deformation groove relative to the external atmospheric pressure, which can reduce the pressing resistance of the key body and thus improve the user's pressing experience when pressing the key body.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0024] Figure 1 This is a structural diagram of an electric energy meter according to an embodiment of the present utility model;

[0025] Figure 2 This is an exploded schematic diagram of an electric energy meter according to an embodiment of the present utility model;

[0026] Figure 3 This is a top view of an electric energy meter according to an embodiment of the present utility model;

[0027] Figure 4 for Figure 3 Cross-sectional view along line AA;

[0028] Figure 5 for Figure 4 A partial enlarged view of part B;

[0029] Figure 6 This is a structural diagram of a keypad according to an embodiment of the present invention;

[0030] Figure 7 This is a structural schematic diagram of a keypad according to an embodiment of the present invention from another perspective;

[0031] Figure 8 This is a schematic diagram of the internal structure of a keypad according to an embodiment of the present invention;

[0032] Figure 9 This is a structural diagram of a key body according to an embodiment of the present invention.

[0033] Figure Number:

[0034] Shell 100, through hole 110, first annular protrusion 120, second annular protrusion 130, accommodating cavity 140, groove 150, button body 200, pressing part 210, triggering part 220, limiting protrusion 221, deformation through hole 222, reinforcing rib 230, button pad 300, sealing groove 301, elastic part 310, deformation groove 311, exhaust part 312, fixing part 320, conductive part 330, circuit board 400. DETAILED DESCRIPTION

[0035] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0036] In the description of the present invention, it should be understood that descriptions involving orientation, such as the orientation or positional relationship indicated by up, down, etc., are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] In the description of this utility model, "a plurality" means more than two. The use of "first" or "second" is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of the indicated technical features, or implicitly indicating the order of the indicated technical features.

[0038] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0039] In related technologies, the buttons on energy meters are mostly in their initial, free position. They only switch to their second state or position when an external force forces the elastic element inside to deform. Once the external force is removed, the switch returns to its initial position. These elastic elements are mostly springs, and the gaps in the springs significantly reduce the water resistance of the energy meter. To improve the water resistance of the energy meter, a soft rubber pad is generally used instead of the spring. The soft rubber pad has a sealed cavity. When the soft rubber pad is deformed by the button, the air pressure in the cavity increases, resulting in increased resistance to pressing the button, which affects the pressing experience.

[0040] Based on this, this embodiment sets an exhaust portion 312 connected to the outside world on the deformation groove 311. When the button body 200 presses the elastic portion 310, the deformation groove 311 is deformed, and the air in the deformation groove 311 can be discharged in time, so that the air pressure in the deformation groove 311 is relative to the external atmospheric pressure, which can reduce the pressing resistance of the button body 200, thereby improving the user's pressing experience when pressing the button body 200.

[0041] Reference Figures 1 to 5 , Figure 1 This is a structural diagram of an electric energy meter according to an embodiment of the present utility model. Figure 2This is an exploded schematic diagram of an electric energy meter according to an embodiment of the present utility model. Figure 3 This is a top view of an electric energy meter according to an embodiment of the present utility model. Figure 4 for Figure 3 The cross-sectional view of the AA line, Figure 5 for Figure 4 A partial enlarged view of part B, where Figure 5 The middle button body 200 is in a state where the elastic portion 310 is not pressed. Figures 1 to 5 As shown, the key structure of this embodiment includes a housing 100, a key pad 300 and a key body 200. The housing 100 is provided with a through hole 110. The key pad 300 includes a fixing portion 320 and an elastic portion 310. The fixing portion 320 is connected to the outer peripheral surface of the elastic portion 310. The fixing portion 320 is connected to the housing 100. The elastic portion 310 is provided with a deformation groove 311. The inner wall of the deformation groove 311 is provided with an exhaust portion 312 that penetrates the elastic portion 310. The key body 200 is movably provided on The through hole 110 can abut against the elastic part 310. When the button body 200 presses the elastic part 310, the space in the deformation groove 311 collapses and the space in the deformation groove 311 shrinks. By setting the exhaust part 312, the air in the deformation groove 311 can be discharged to the outside in time through the exhaust part 312 to avoid the situation where the air pressure in the deformation groove 311 is too high, which leads to an increase in the pressing resistance of the button body 200, thereby improving the user's pressing experience when pressing the button body 200.

[0042] It should be noted that a accommodating chamber 140 is provided inside the shell 100, and the through hole 110 is connected to the accommodating chamber 140. A circuit board 400 is provided in the accommodating chamber 140, and the circuit board 400 is covered on the elastic part 310 to seal the deformation groove 311, so that the deformation groove 311 is a closed space. By setting the exhaust part 312, the air in the deformation groove 311 can be discharged in time.

[0043] Reference Figures 5 to 8 , Figure 6 This is a structural diagram of a keypad 300 according to an embodiment of the present invention. Figure 7 for Figure 6 The keypad 300 is a schematic diagram of a structure after being flipped 180 degrees. Figure 8 This is a schematic diagram of the internal structure of a keypad 300 according to an embodiment of the present invention. As shown, in this embodiment, the vent portion 312 is configured as an exhaust groove. The exhaust groove extends radially along the deformation groove 311. The exhaust groove is located at the periphery of the notch of the deformation groove 311, and one side of the exhaust groove extends through the sidewall of the deformation groove 311. This facilitates the exhaust of air within the deformation groove 311 and simplifies the mold structure, facilitating the production of the keypad body 200.

[0044] As another embodiment, the exhaust portion 312 can also be configured as an exhaust hole, which penetrates the deformation groove 311 radially to the side wall of the deformation groove 311 and can also facilitate the exhaust of air in the deformation groove 311, which is not limited here.

[0045] In this embodiment, four exhaust portions 312 are configured, and the four exhaust portions 312 are evenly spaced along the circumference of the deformation groove 311. When the elastic portion 310 is pressed by the key body 200, the air in the deformation groove 311 can be discharged from the four exhaust portions 312 at the same time, so that the deformation of each position of the wall of the deformation groove 311 is uniform, thereby preventing the local position of the elastic portion 310 from causing irreversible deformation, and improving the service life of the key pad 300.

[0046] Of course, in other specific implementations, two or three exhaust parts 312 may be configured.

[0047] A micro switch for triggering the key body 200 is mounted on the conventional circuit board 400 . The mechanical structure of the micro switch is complex, and the assembly efficiency of the micro switch is low.

[0048] Based on this, for example Figure 5 、 Figure 7 As shown, in this embodiment, a conductive portion 330 is provided on the side of the elastic portion 310 away from the button body 200, and a first conductive film and a second conductive film are designed to be spaced apart on the circuit board 400. When the button body 200 presses the elastic portion 310 to deform, the conductive portion 330 can contact the first conductive film and the second conductive film to connect the first conductive film and the second conductive film, so that the circuit connected to the first conductive film and the second conductive film on the circuit board 400 is closed, and the traditional technical solution of using a micro switch to control the closing or disconnection of the circuit can be abandoned. On the one hand, the number of electrical components on the circuit board 400 can be saved. On the other hand, the structure of the conductive portion 330, the first conductive film and the second conductive film is simpler and more reliable to use, which can reduce the maintenance times of the electric energy meter.

[0049] For example, the conductive portion 330 can be a soft, conductive rubber, such as conductive rubber. Conductive rubber is a material in which conductive particles, such as silver, are evenly distributed throughout the rubber, resulting in excellent electrical conductivity. Conductive rubber is relatively soft, and when the key body 200 presses the elastic portion 310, the conductive portion 330 deforms along with the elastic portion 310. This not only facilitates the deformation of the elastic portion 310 but also ensures that the conductive portion 330 effectively connects the first conductive film and the second conductive film.

[0050] It should be noted that the conductive portion 330 can be fixed on the elastic portion 310 by means of mold forming or bonding, which will not be described in detail here.

[0051] As another embodiment, the conductive portion 330 can also be a conductive carbon film. Conductive carbon film is a thin film material composed of carbon elements and has excellent electrical conductivity. The conductive carbon film is fixed to the side of the elastic portion 310 facing away from the key body 200 by bonding, which facilitates the installation of the conductive portion 330 on the elastic portion 310. Similarly, the first conductive film and the second conductive film can also be made of conductive carbon film materials, without limitation.

[0052] For example Figure 6 As shown, in this embodiment, the fixing portion 320 is annular in structure. In the axial direction of the through hole 110, the fixing portion 320 is extended along the direction of the button body 200 so that a sealing groove 301 is formed between the fixing portion 320 and the elastic portion 310. A first annular protrusion 120 is provided on the inner side of the shell 100. Along the axial direction of the through hole 110, the first annular protrusion 120 is arranged around the outer periphery of the through hole 110. One end of the first annular protrusion 120 is accommodated in the sealing groove 301 and can abut against the side wall of the sealing groove 301. When rainwater flows from the inside of the shell 100 at the through hole 110, the rainwater is stored in the sealing groove 301 and cannot come into contact with the electrical components on the circuit board 400, thereby improving the waterproof and dustproof performance of the electric energy meter.

[0053] It should be noted that the keypad 300 is configured as a soft rubber pad. The soft rubber pad is made of a relatively soft material, allowing the keypad 300 to fit more tightly against the connection portion, preventing water leakage. In one embodiment, the keypad 300 can abut against the circuit board 400 to limit the position of the keypad 300. It is understood that the soft rubber pad can be made of materials such as rubber and silicone, and this is not a limitation here.

[0054] It should be noted that the elastic portion 310 and the fixed portion 320 are an integrated structure, and the elastic portion 310 and the fixed portion 320 can be integrally formed by injection molding, which can reduce the number of molds and thus reduce the production cost of the keypad 300. Details will not be given here.

[0055] As another embodiment, the fixing plate may be partially accommodated in the first annular protrusion 120 and abut against the inner circumference of the first annular protrusion 120 , and the sealing groove 301 may also be able to effectively retain rainwater, which is not limited here.

[0056] It is understood that when water accumulates in the sealing groove 301, the water can be naturally evaporated and dissipated from the gap between the trigger portion 220 and the sidewall of the through-hole 110 to the outside, thereby preventing the water in the sealing groove 301 from generating odor. Furthermore, since the circuit board 400 generates a certain amount of heat during normal operation of the energy meter, this heat can accelerate the evaporation rate of the water in the sealing groove 301, thereby reducing the time the water stays in the sealing groove 301. This will not be further explained here.

[0057] Reference Figure 5 、 Figure 9 , Figure 9 The figure is a schematic structural diagram of a key body 200 according to an embodiment of the present invention. As shown in the figure, in order to improve the dustproof performance of the key structure, the key body 200 is designed as a T-shaped structure in this embodiment. The key body 200 includes a pressing portion 210 and a trigger portion 220. The trigger portion 220 is an axial structure. The trigger portion 220 is movably arranged in the through hole 110. One end of the trigger portion 220 is connected to the pressing portion 210, and the other end of the trigger portion 220 is in contact with the elastic portion 310. The pressing portion 210 is arranged to extend radially along the trigger portion 220 so that the pressing portion 210 can block the through hole 110, thereby reducing the occurrence of rainwater or dust entering the housing 100 through the gap between the side wall of the through hole 110 and the trigger portion 220, thereby improving the waterproof and dustproof performance of the electric energy meter.

[0058] For example Figure 9 As shown, in this embodiment, the trigger portion 220 is provided with a limiting protrusion 221, which is extended along the circumference of the trigger portion 220. When the button body 200 is not pressed, the elastic portion 310 pushes the button body 200 under the action of its own elasticity, so that the limiting protrusion 221 abuts against the peripheral edge of the through hole 110 on the side facing the key pad 300, which can limit the separation of the button body 200 and the shell 100, so as to improve the installation stability of the button body 200.

[0059] It should be noted that in order to facilitate the assembly of the button body 200 on the shell 100, a chamfered structure is provided on the side of the limiting protrusion 221 facing away from the pressing portion 210. The chamfered structure can guide the limiting protrusion 221 through the through hole 110 into the interior of the shell 100 to facilitate the assembly of the button body 200, wherein the chamfered structure can also be replaced by a rounded structure. In addition, in order to reduce the interference between the limiting protrusion 221 and the side wall of the through hole 110, a deformable through hole 222 is provided on the trigger part 220. The deformable through hole 222 is a waist-shaped hole structure. The deformable through hole 222 is extended along the axial direction of the trigger part 220. Along the radial direction of the trigger part 220, the deformable through hole 222 passes through the trigger part 220. The limiting protrusion 221 is provided on the outer peripheral surface of the deformable through hole 222. During the process of assembling the button body 200, when the limiting protrusion 221 abuts against the side wall of the through hole 110, the relative side walls of the deformable through hole 222 approach each other, so that the outer diameter of the limiting protrusion 221 is reduced, thereby reducing the interference between the limiting protrusion 221 and the side wall of the through hole 110, which can facilitate the assembly of the button body 200.

[0060] As another embodiment, the trigger portion 220 may further be provided with a receiving groove, and the limiting protrusion 221 is provided in the receiving groove and can slide along the radial direction of the trigger portion 220 to extend or retract the receiving groove. A compression spring is provided between the limiting protrusion 221 and the trigger portion 220. When the limiting protrusion 221 abuts against the side wall of the through hole 110, the limiting protrusion 221 can move in the direction of retracting into the receiving groove to reduce the interference between the limiting protrusion 221 and the side wall of the through hole 110. The compression spring is in a compressed state. When the limiting protrusion 221 enters the interior of the shell 100, the compression spring drives the limiting protrusion 221 to move in the direction of extending out of the receiving groove so that the limiting protrusion 221 can abut against the peripheral edge of the through hole 110 on the side facing the key pad 300. At this time, there is no need to provide a deformable through hole 222, and it is also convenient to assemble the key body 200. No limitation is made here.

[0061] For example Figure 5 As shown, in this embodiment, a second annular protrusion 130 is provided on the outer side of the shell 100. Along the axial direction of the through hole 110, the second annular protrusion 130 is arranged around the outer periphery of the through hole 110. Rainwater on the outer surface of the shell 100 needs to pass over the second annular protrusion 130 before entering the through hole 110. The second annular protrusion 130 can prevent rainwater on the outer surface of the shell 100 from flowing from the through hole 110 into the interior of the shell 100, thereby improving the waterproof performance of the electric energy meter.

[0062] It should be noted that, along the direction perpendicular to the axial direction of the through hole 110 , the cross-sectional shape of the through hole 110 is such that the second annular protrusion 130 is in a circular ring structure.

[0063] It should be noted that the periphery of the second annular protrusion 130 is recessed to form a groove 150, and the pressing portion 210 is accommodated within the groove 150, thereby improving the dustproof performance of the electric energy meter. For example, a small gap exists between the outer peripheral surface of the pressing portion 210 and the sidewall of the groove 150, which can filter out larger dust particles, thereby preventing large dust particles from being located under the pressing portion 210 and affecting the normal use of the button body 200, thereby improving the dustproof performance of the electric energy meter.

[0064] Because the trigger portion 220 is subjected to the force, the connection between the trigger portion 220 and the pressing portion 210 is prone to breakage, causing the key body 200 to fail and shortening the service life of the key body 200. To address this issue, in this embodiment, a reinforcing rib 230 is provided between the trigger portion 220 and the pressing portion 210. The reinforcing rib 230 extends along the circumference of the trigger portion 220. One side of the reinforcing rib 230 is connected to the side wall of the trigger portion 220, and the other adjacent side of the reinforcing rib 230 is connected to the pressing portion 210. This can improve the structural strength of the key body 200, prevent the connection between the trigger portion 220 and the pressing portion 210 from breaking, and thus extend the service life of the key body 200.

[0065] It should be noted that the reinforcing rib 230 can also be a rib-shaped structure. In this case, there are at least two reinforcing ribs 230. At least two reinforcing ribs 230 are arranged at intervals along the circumference of the trigger part 220, which can further improve the structural strength of the trigger part 220. This is not limited here.

[0066] In this embodiment, the pressing portion 210 and the triggering portion 220 are an integrated structure, which can reduce the number of molds, thereby reducing the production cost of the molds and thus reducing the production cost of the button body 200.

[0067] For example, the pressing portion 210 and the triggering portion 220 can be integrally formed by injection molding, and the button body 200 is a plastic part. Plastic parts have higher structural strength, strong corrosion resistance, and are durable.

[0068] As another embodiment, the trigger portion 220 and the pressing portion 210 may also be connected by welding, wherein the welding method includes but is not limited to resistance welding, ultrasonic welding or laser welding.

[0069] As another embodiment, the trigger part 220 and the pressing part 210 can also be connected by a threaded connection. For example, a threaded hole is provided on the trigger part 220, and a threaded column is provided on the pressing part 210. The threaded column and the threaded hole are threadedly matched to relatively fix the trigger part 220 and the pressing part 210. No further details are given here.

[0070] The electric energy meter of the second embodiment of the present utility model includes the key structure of the above embodiment.

[0071] The electric energy meter of the second embodiment of the utility model adopts the key structure of the first embodiment.

[0072] By providing an exhaust portion 312 connected to the outside world on the deformation groove 311, when the button body 200 presses the elastic portion 310, the deformation groove 311 is deformed, and the air in the deformation groove 311 can be discharged in time, so that the air pressure in the deformation groove 311 is relative to the external atmospheric pressure, which can reduce the pressing resistance of the button body 200, thereby improving the user's pressing experience when pressing the button body 200.

[0073] Since the electric energy meter adopts all the technical solutions of the key structure of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment, which will not be described in detail here.

[0074] An embodiment of the present invention has been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiment. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A key structure for an electric energy meter, characterized in that: include: A housing having a through hole; A button body is inserted into the through hole; The key pad includes an elastic portion and a fixed portion, wherein the fixed portion is connected to the outer peripheral surface of the elastic portion, and the fixed portion is connected to the shell. One end of the key body abuts against the elastic portion. A deformation groove is provided on the side of the elastic portion away from the key body. The deformation groove has an exhaust portion that passes through the elastic portion. When one end of the key body presses the elastic portion, the air in the deformation groove is discharged through the exhaust portion.

2. The key structure according to claim 1, wherein: A plurality of the exhaust portions are provided, and the plurality of the exhaust portions are spaced apart along the circumferential direction of the elastic portion.

3. The key structure according to claim 1, wherein: The deformation groove has an opening, and a conductive portion is provided on a side of the elastic portion facing away from the button body. The conductive portion can close a circuit on a circuit board of the electric energy meter.

4. The key structure according to claim 1, wherein: A sealing groove is formed between the fixing portion and the elastic portion. A first annular protrusion is provided on the inner side of the shell. Along the axial direction of the through hole, the first annular protrusion is arranged around the outer circumference of the through hole. One end of the first annular protrusion is accommodated in the sealing groove and can abut against the side wall of the sealing groove.

5. The key structure according to claim 1, wherein: A second annular protrusion is provided on the outer side of the shell, and along the axial direction of the through hole, the second annular protrusion is arranged around the outer circumference of the through hole.

6. The key structure according to claim 1, wherein: The button body includes a pressing portion and a triggering portion connected to the pressing portion. The triggering portion is arranged through the through hole and can abut against the elastic portion. The pressing portion blocks the through hole.

7. The key structure according to claim 6, characterized in that: The trigger portion is provided with a limiting protrusion, and the limiting protrusion can abut against the peripheral edge of the through hole on a side away from the pressing portion.

8. The key structure according to claim 6, wherein: The pressing portion and the trigger portion are an integrated structure.

9. The key structure according to claim 6, characterized in that: A reinforcing rib is provided between the pressing portion and the triggering portion.

10. Electric energy meter, characterized by: The key structure comprises the key structure described in any one of claims 1 to 9.

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