Key structure and electric energy meter

Abstract

The utility model discloses a button structure and an electric energy meter, and relates to the technical field of electric energy meters, the button structure comprises a housing and a button body, the housing is provided with a through hole and a first annular projection located at one side of the through hole, the first annular projection is arranged around the periphery of the through hole along the axis direction of the through hole, and the first annular projection is arranged around the periphery of the through hole. The key body comprises a pressing part and a triggering part connected to the pressing part, the pressing part is provided with a second annular protrusion surrounding the triggering part, a containing groove is defined between the triggering part and the second annular protrusion, the triggering part is arranged in the through hole in a penetrating mode, and at least part of the first annular protrusion is contained in the containing groove; the second annular protrusion can shield the first annular protrusion, small insects can be prevented from entering the interior of the shell from the gap between the trigger part and the through hole, normal operation of the electric energy meter is guaranteed, and therefore the measurement error of the electric energy meter is reduced.

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] Electricity meters, which measure the energy consumed in circuits, are essential electronic components for homes and businesses. Waterproofing and insect resistance are key to extending the lifespan of electricity meters, and dust protection of the buttons is particularly important. However, existing technology lacks adequate protection for the buttons, allowing smaller insects to easily enter the meter through the buttons, disrupting its operation and causing significant measurement errors. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a key structure to ensure that the electric energy meter can operate normally, thereby reducing the measurement error of the electric energy meter.

[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] The housing is provided with a through hole and a first annular protrusion located on one side of the through hole, wherein the first annular protrusion is arranged around the outer circumference of the through hole along the axis direction of the through hole;

[0007] The button body includes a pressing portion and a triggering portion connected to the pressing portion. The pressing portion is provided with a second annular protrusion arranged around the triggering portion. The triggering portion and the second annular protrusion form an accommodating groove. The triggering portion is passed through the through hole, and the first annular protrusion is at least partially accommodated in the accommodating groove.

[0008] The key structure according to one embodiment of the present invention has at least the following beneficial effects:

[0009] By arranging a first annular protrusion on the shell and a second annular protrusion on the button body, when the button body is pressed, the end of the first annular protrusion enters the accommodating groove, so that the second annular protrusion can cover the first annular protrusion, and can prevent small insects from entering the interior of the shell through the gap between the trigger part and the through hole, ensuring that the electric energy meter can operate normally, thereby reducing the measurement error of the electric energy meter.

[0010] According to some embodiments of the present invention, the shell is provided with a rib, which is arranged on one side of the first annular protrusion in the radial direction. The side of the rib away from the first annular protrusion is provided with a water retaining groove, and the water retaining groove runs through the shell along the length direction of the rib.

[0011] According to some embodiments of the present invention, a protective protrusion is provided on a side of the pressing portion facing the triggering portion, and the protective protrusion is accommodated in the water retaining groove.

[0012] According to some embodiments of the present invention, the pressing portion, the trigger portion, and the second annular protrusion are an integrated structure.

[0013] According to some embodiments of the present invention, a reinforcing rib is provided between the second annular protrusion and the trigger portion.

[0014] According to some embodiments of the present invention, the button structure also includes a button pad, the button body includes an elastic part and a fixed part connected to the periphery of the elastic part, the trigger part is abutted against the elastic part at one end away from the pressing part, and a connecting part is provided on the inner side of the shell, and the fixed part is connected to the connecting part.

[0015] According to some embodiments of the present invention, the fixing portion and the elastic portion are arranged on a side close to the trigger portion to form a sealing groove, and along the axial direction of the through hole, the connecting portion is arranged around the outer circumference of the through hole, and one end of the connecting portion is accommodated in the sealing groove and can abut against the side wall of the sealing groove.

[0016] According to some embodiments of the present invention, a conductive portion is provided on a side of the elastic portion facing away from the trigger portion, and the conductive portion is used to close a circuit on a PCB board.

[0017] 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.

[0018] The compressor according to one embodiment of the present invention has at least the following beneficial effects:

[0019] The key structure of the first aspect embodiment is adopted, by arranging a first annular protrusion on the bottom wall of the groove and a second annular protrusion on the pressing part. When the key body is pressed, the second annular protrusion partially overlaps with the first annular protrusion in the axial direction of the trigger part, so that the second annular protrusion can cover the first annular protrusion, and can prevent small insects from entering the interior of the shell from the gap between the trigger part and the through hole, thereby ensuring that the electric energy meter can operate normally, thereby reducing the measurement error of the electric energy meter.

[0020] According to some embodiments of the present invention, the electric energy meter further includes a PCB board, which is disposed in the housing. The PCB board is provided with a detection button. When the trigger part releases the detection button, the PCB board is configured such that the number of times the trigger part is separated from the detection button increases.

[0021] 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

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0023] Figure 1 This is a structural diagram of an electric energy meter according to an embodiment of the present utility model;

[0024] Figure 2 This is an exploded schematic diagram of an electric energy meter according to an embodiment of the present utility model;

[0025] Figure 3 This is a top view of an electric energy meter according to an embodiment of the present utility model;

[0026] Figure 4 for Figure 3 Cross-sectional view along line AA;

[0027] Figure 5 for Figure 4 A partial enlarged view of part B in the middle shows elastic deformation of the elastic part;

[0028] Figure 6 This is a schematic diagram of the structure of an electric energy meter according to an embodiment of the present utility model, wherein the button body is hidden;

[0029] Figure 7 for Figure 6 A top view of

[0030] Figure 8 This is a structural diagram of a key body according to an embodiment of the present invention;

[0031] Figure 9 for Figure 8 A top view of

[0032] Figure 10 This is a schematic diagram of the internal structure of a keypad according to an embodiment of the present invention, in which the elastic portion does not undergo elastic deformation.

[0033] Figure Number:

[0034] Shell 100, first annular protrusion 110, rib 120, through hole 130, water retaining groove 140, connecting part 150, groove 160, key body 200, accommodating groove 201, pressing part 210, protective protrusion 211, trigger part 220, second annular protrusion 230, reinforcing rib 240, key pad 300, sealing groove 301, elastic part 310, fixing part 320, conductive part 330, PCB 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 technical features indicated, or implicitly indicating the order of the technical features indicated.

[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 the related art, the protection function of the buttons of the electricity meter is insufficient, and small insects can easily enter the interior of the electricity meter through the buttons, affecting the normal operation of the electricity meter and causing large measurement errors of the electricity meter.

[0040] Based on this, this embodiment sets a first annular protrusion 110 on the shell 100 and a second annular protrusion 230 on the button body 200. When the button body 200 is pressed, the first annular protrusion 110 enters the accommodating groove 201, and the second annular protrusion 230 partially overlaps with the first annular protrusion 110, so that the second annular protrusion 230 can cover the first annular protrusion 110, and can prevent small insects from entering the interior of the shell 100 from the gap between the trigger part 220 and the through hole 130, thereby ensuring that the electric energy meter can operate normally, thereby reducing the measurement error of the electric energy meter.

[0041] Reference Figures 1 to 5 Combined with Figure 8 , Figure 1 and Figure 2 This is a structural diagram and exploded diagram of an electric energy meter according to an embodiment of the present invention. Figure 3 This is a top view of an electric energy meter according to an embodiment of the present utility model. Figure 4for Figure 3 The cross-sectional view of the AA line, Figure 5 for Figure 4 A partial enlarged view of part B. Figure 8 The schematic diagram of the structure of the key body of an embodiment of the present invention is shown in the figure. As shown in the figure, the key structure of this embodiment includes a shell 100 and a key body 200. The outer side of the shell 100 is provided with a first annular protrusion 110 and a through hole 130. The first annular protrusion 110 is located on one side of the circumference of the through hole 130. Along the axial direction of the through hole 130, the first annular protrusion 110 is arranged around the outer periphery of the through hole 130. The key body 200 includes a pressing portion 210 and a trigger portion 220. The trigger portion 220 is an axial structure. One end of the trigger portion 220 is connected to the pressing portion 210, and the other end of the trigger portion 220 is used to trigger the key switch on the PCB board 400. The pressing portion is provided with a protrusion arranged around the trigger portion 220. The second annular protrusion 230 is arranged, the first annular protrusion 110 and the second annular protrusion 230 are annular structures, and the second annular protrusion 230 and the trigger part 220 form a receiving groove 201. When the button body 200 is pressed, the second annular protrusion 230 is sleeved on the first annular protrusion 110, and part of the first annular protrusion 110 enters the receiving groove 201, so that the second annular protrusion 230 can cover the first annular protrusion 110 to prevent small insects from entering the interior of the shell 100 through the gap between the trigger part 220 and the through hole 130, thereby ensuring that the electric energy meter can operate normally, thereby reducing the measurement error of the electric energy meter.

[0042] It should be noted that, along the direction perpendicular to the axial direction of the trigger portion 220, the shape of the cross section of the trigger portion 220 matches the shape of the cross section of the through hole 130. For example, when the cross section of the trigger portion 220 is circular, the cross section of the through hole 130 is correspondingly circular. When the cross section of the trigger portion 220 is rectangular, the cross section of the through hole 130 is correspondingly rectangular, so as to reduce the gap between the trigger portion 220 and the side wall of the through hole 130, thereby reducing the risk of small insects entering the interior of the shell 100 from the gap between the trigger portion 220 and the side wall of the through hole 130.

[0043] It should be noted that, along the direction perpendicular to the axial direction of the trigger portion 220, the shape of the cross section of the first annular protrusion 110 matches the shape of the cross section of the second annular protrusion 230. For example, when the cross section of the first annular protrusion 110 is circular, the cross section of the second annular protrusion 230 is correspondingly circular; when the cross section of the first annular protrusion 110 is rectangular, the cross section of the second annular protrusion 230 is correspondingly rectangular.

[0044] It should be noted that when the key body 200 is pressed, the key body 200 is connected to the housing 100 via a fastener. The fastener is disposed through the key body 200 and is threadedly connected to the housing 100, thereby achieving a stable connection between the key body 200 and the housing 100, making installation more convenient and easy to disassemble. The fastener can be a bolt, a screw, or other component, which is not limited here.

[0045] Reference Figure 6 、 Figure 7 , Figure 6 This is a schematic diagram of the structure of an electric energy meter according to an embodiment of the present utility model, wherein: Figure 6 The button body 200 is hidden in the Figure 7 for Figure 6 For example, Figure 6 、 Figure 7 As shown, the shell 100 of this embodiment is provided with a rib 120, which is a long strip structure. Along the radial direction of the first annular protrusion 110, the rib 120 and the first annular protrusion 110 are spaced apart. A water retaining groove 140 is provided on the side of the rib 120 away from the first annular protrusion. The water retaining groove 140 is correspondingly a long strip structure. The length direction of the water retaining groove 140 extends along the width direction of the shell 100. In the length direction of the rib 120, both ends of the water retaining groove 140 pass through the shell 100. When rainwater on the surface of the shell 100 flows from the rib 120 to the first annular protrusion 110, the rainwater first enters the water retaining groove 140, and then the accumulated water in the water retaining groove 140 flows out of the water retaining groove 140 from both ends of the water retaining groove 140 to prevent the accumulated water in the water retaining groove 140 from flooding the notch of the groove 160 and entering the groove 160, thereby improving the waterproof performance of the electric energy meter.

[0046] As another embodiment, one end of the water retaining groove 140 may pass through the shell 100 in the length direction of the retaining edge 120, while the other end of the water retaining groove 140 does not pass through the shell 100, so that the accumulated water in the water retaining groove 140 can be discharged conveniently and promptly, and no limitation is made here.

[0047] It should be noted that the retaining edge 120 may also be in an arc-shaped structure, and the water retaining groove may be in an arc-shaped structure accordingly, which is not limited here.

[0048] It should be pointed out that a groove 160 is formed between the rib 120 and the first annular protrusion 110. When the electric energy meter is in normal operation, the pressing portion 210 blocks the groove 160, which can reduce the occurrence of small insects entering the groove 160 from the gap between the pressing portion 210 and the rib 120, thereby improving the insect-proof performance of the electric energy meter.

[0049] For example Figure 6 、 Figure 8As shown, in this embodiment, a protective protrusion 211 is provided on the side of the pressing portion 210 facing the trigger portion 220, and the protective protrusion 211 is a long strip structure. When the button body 200 is pressed, the protective protrusion 211 is accommodated in the water retaining groove 140, and the protective protrusion 211 can block the gap between the pressing portion 210 and the retaining edge 120, so that dust or small insects cannot enter the groove 160 from the gap between the pressing portion 210 and the retaining edge 120, which can improve the dustproof and insectproof performance of the electric energy meter.

[0050] For example Figure 8 As shown, in this embodiment, the pressing portion 210 , the trigger portion 220 and the second annular protrusion 230 are an integrated structure, which can reduce the number of molds to reduce the production cost of the molds, thereby reducing the production cost of the button body 200 .

[0051] For example, the pressing portion 210, the trigger portion 220 and the second annular protrusion 230 can be integrally formed by injection molding, and the button body 200 is a plastic part. The plastic part has higher structural strength, strong corrosion resistance and durability.

[0052] As another embodiment, the trigger portion 220 and the second annular protrusion 230 may also be fixed to the pressing portion 210 by welding, wherein the welding method includes but is not limited to resistance welding, ultrasonic welding or laser welding.

[0053] As another embodiment, the trigger portion 220 and the second annular protrusion 230 can also be fixed to the pressing portion 210 by bolting or clamping, which can facilitate the production of the button body 200 and will not be described in detail here.

[0054] As another embodiment, the trigger portion 220 and the second annular protrusion 230 may be an integrated structure, and the second annular protrusion 230 may be fixedly connected to the pressing portion 210 by a threaded connection, which can also facilitate the production of the button body 200 and will not be repeated here.

[0055] Reference Figure 9 , Figure 9 for Figure 8As the trigger portion 220 is subjected to the force, the connection position between the trigger portion 220 and the pressing portion 210 is prone to breakage, causing the key body 200 to fail and the service life of the key body 200 to be reduced. Based on this, in this example, a reinforcing rib 240 is provided between the second annular protrusion 230 and the trigger portion 220. In the radial direction of the trigger portion 220, one side of the reinforcing rib 240 is connected to the side wall of the accommodating groove 201, and the other opposite side of the reinforcing rib 240 is connected to the outer peripheral surface of the trigger portion 220, which can improve the structural strength of the trigger portion 220, thereby avoiding the situation where the connection position between the trigger portion 220 and the pressing portion 210 breaks, and can improve the service life of the key body 200.

[0056] It should be noted that, in the axial direction of the trigger portion 220 , one side of the reinforcing rib 240 is connected to the bottom wall of the accommodating groove 201 , which can further improve the structural strength of the trigger portion 220 .

[0057] It should be noted that there are two reinforcing ribs 240 , which are arranged at intervals along the circumference of the accommodating groove 201 , which can further improve the structural strength of the trigger part 220 , thereby improving the structural stability of the key body 200 and thus improving the service life of the key body 200 .

[0058] It is understandable that the reinforcement rib 240 can also be configured with one or three, etc., which is not limited here.

[0059] The buttons of traditional electricity meters are mostly in their initial, free position. They only switch to their second state or position when an external force acts on the buttons, forcing the elastic element inside to deform. Once the force is removed, the switch returns to its initial position. In existing technology, these elastic elements are mostly springs. Under prolonged pressure, springs deform and fatigue, causing their elasticity and resilience to gradually weaken, eventually losing their elasticity.

[0060] Based on this, refer to Figure 5 、 Figure 10 , Figure 10 This is a schematic diagram of the internal structure of a keypad 300 according to an embodiment of the present invention, in which the elastic portion 310 does not undergo elastic deformation. In this embodiment, the elastic element is configured as a keypad 300, which includes an elastic portion 310 and a fixing portion 320. The fixing portion 320 is connected to the outer periphery of the elastic portion 310, and the trigger portion 220 abuts against the elastic portion 310 at one end away from the pressing portion 210. A connecting portion 150 is provided on the side of the housing 100 facing away from the first annular protrusion 110, and the fixing portion 320 is connected to the connecting portion 150. The material properties of the keypad 300 itself make the elastic portion 310 elastic. Before the keypad 300 ages, the elastic portion 310 can maintain its original elasticity and resilience.

[0061] For example, under the action of external force, the key body 200 is pressed. Since the fixing part 320 is connected to the connecting part 150, the fixing part 320 does not deform, and the triggering part 220 squeezes the elastic part 310 to produce elastic deformation, so that the elastic part 310 can trigger the switch element on the PCB board to close the corresponding circuit on the PCB board. When the external force is removed, the elastic part 310 rebounds, and the key body 200 switches to the initial position. The elastic part 310 does not trigger the switch element on the PCB board, and can replace the traditional spring to increase the service life of the key structure.

[0062] In this embodiment, the connecting portion 150 has an annular structure and is arranged around the outer periphery of the through hole 130 along the axial direction of the through hole 130. The fixing portion 320 and the elastic portion 310 enclose a sealing groove 301 on the side facing the trigger portion 220. The fixing portion 320 has a corresponding annular structure and extends in a direction close to the pressing portion 210. One end of the connecting portion 150 is accommodated in the sealing groove 301 and can abut against the side wall of the sealing groove 301, so that the outer peripheral surface of the connecting portion 150 can be tightly attached to the inner peripheral surface of the fixing portion 320. Even if the accumulated water in the groove 160 flows into the through hole 130, the accumulated water can only be intercepted in the sealing groove 301 and cannot contact the PCB board, which can improve the waterproof performance of the electric energy meter.

[0063] It should be noted that when water accumulates in the sealing groove 301, it can naturally evaporate and dissipate from the gap between the trigger portion 220 and the sidewall of the through-hole 130 to the outside, thereby preventing the accumulated water in the sealing groove 301 from generating odor. Furthermore, since the PCB 400 generates a certain amount of heat during normal operation of the energy meter, this heat can accelerate the evaporation rate of the accumulated water in the sealing groove 301, thereby reducing the time the accumulated water stays in the sealing groove 301. This will not be further explained here.

[0064] It should be noted that the fixing portion 320 may also be connected by bonding, as long as it is convenient to fix the key pad 300 , and this is not limited here.

[0065] As another embodiment, the fixing portion 320 can also be directly fixed to the PCB board 400 in the housing 100 by bonding, without being fixed to the connecting portion 150, which can also facilitate the fixing of the key pad 300 and will not be repeated here.

[0066] In this embodiment, the keypad 300 is configured as a soft rubber pad. The soft rubber pad's material allows for a tighter fit between the keypad 300 and the connecting portion 150, preventing water leakage. In one embodiment, the keypad 300 can abut against the PCB inside the energy meter 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.

[0067] The circuit of the PCB board of a traditional electric energy meter is generally closed or disconnected by a switch element. The mechanical structure of the switch element is relatively complex. After long-term use, the switch element is prone to failure, affecting the normal use of the electric energy meter. Based on this, in this embodiment, a conductive portion 330 is provided on the side of the elastic portion 310 away from the trigger portion 220. The conductive portion 330 itself has a conductive function. In this way, when designing the circuit of the PCB board, a first conductive film and a second conductive film can be designed to be separated and provided on the PCB board. When the button body 200 is pressed, the conductive portion 330 contacts the first conductive film and the second conductive film. At this time, the first conductive film and the second conductive film are connected, and the corresponding circuit on the PCB board is closed. When the button body 200 returns to the initial position, the conductive portion 330 is separated from the conductive film. This can abandon the traditional solution of using a switch element to close or disconnect the circuit, so as to ensure that the electric energy meter can continue to be used normally.

[0068] It should be noted that the fixing portion 320 , the elastic portion 310 and the conductive portion 330 are an integrated structure, which can reduce the number of molds and thus lower the manufacturing cost of the keypad 300 , and will not be further elaborated here.

[0069] The electric energy meter of the second embodiment of the present utility model includes the key structure of the above embodiment.

[0070] The electric energy meter of the second embodiment of the utility model adopts the key structure of the first embodiment, by arranging a first annular protrusion 110 on the shell 100 and a second annular protrusion 230 on the key body 200. When the key body 200 is pressed, the first annular protrusion 110 enters the accommodating groove 201, and the second annular protrusion 230 partially overlaps with the first annular protrusion 110, so that the second annular protrusion 230 can block the first annular protrusion 110, and can prevent small insects from entering the interior of the shell 100 from the gap between the trigger part 220 and the through hole 130, thereby ensuring that the electric energy meter can operate normally, thereby reducing the measurement error of the electric energy meter.

[0071] 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.

[0072] For example Figures 1 to 5 As shown, Figures 1 to 5The energy meter is in normal operation. The button body 200 in this embodiment serves as a lid opening recorder. The primary purpose of recording lid openings is to monitor and prevent electricity theft. By recording lid openings and related lid opening events, the meter provides a means to track and identify any unauthorized access or modification. This recording function helps power companies or relevant agencies promptly identify any suspicious activity and take appropriate measures.

[0073] By recording the number of times the meter cover is opened, the meter not only improves the safety of the power system, but also provides important data support for power companies to strengthen the management and maintenance of the power system and ensure the fairness and legality of electricity use.

[0074] Based on this, in this embodiment, the electric energy meter further includes a PCB board 400 disposed within the housing 100. A detection button is provided on the PCB board 400, which can disconnect or close the cover-opening recording detection circuit on the PCB board 400. When the electric energy meter is in normal operation, the trigger unit 220 presses the detection button, closing the cover-opening recording detection circuit and outputting a first electrical signal to indicate that the key body 200 has not been opened. When the key body 200 is disassembled, the trigger unit 220 releases the detection button, disconnecting the cover-opening recording detection circuit and outputting a second electrical signal. The PCB board 400 is configured such that the number of times the trigger unit separates from the detection button increases, thereby recording the number of times the electric energy meter's cover has been opened. One of the first electrical signal and the second electrical signal is a low-level signal, and the other is a high-level signal.

[0075] It should be noted that the detection button may be a micro switch, or the detection button may be a structure in which the conductive portion 330 , the first conductive film, and the second conductive film described in the above embodiment cooperate with each other, which is not limited here.

[0076] It should be noted that the key body 200 can also be a digital function key, etc., which is not limited here.

[0077] 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: The housing is provided with a through hole and a first annular protrusion located on one side of the through hole, wherein the first annular protrusion is arranged around the outer circumference of the through hole along the axis direction of the through hole; The button body includes a pressing portion and a triggering portion connected to the pressing portion. The pressing portion is provided with a second annular protrusion arranged around the triggering portion. The triggering portion and the second annular protrusion form an accommodating groove. The triggering portion is passed through the through hole, and the first annular protrusion is at least partially accommodated in the accommodating groove.

2. The key structure according to claim 1, wherein: The shell is provided with a rib, which is provided on one side of the first annular protrusion in the radial direction. A water retaining groove is provided on the side of the rib away from the first annular protrusion. The water retaining groove runs through the shell along the length direction of the rib.

3. The key structure according to claim 2, wherein: A protective protrusion is provided on a side of the pressing portion facing the triggering portion, and the protective protrusion is accommodated in the water retaining groove.

4. The key structure according to claim 1, wherein: The pressing portion, the trigger portion, and the second annular protrusion are an integrated structure.

5. The key structure according to claim 1, wherein: A reinforcing rib is provided between the second annular protrusion and the trigger portion.

6. The key structure according to claim 1, wherein: The button structure also includes a button pad, the button body includes an elastic part and a fixed part connected to the periphery of the elastic part, the trigger part is abutted against the elastic part at one end away from the pressing part, a connecting part is provided on the inner side of the shell, and the fixed part is connected to the connecting part.

7. The key structure according to claim 6, characterized in that: The fixing portion and the elastic portion are arranged together on one side close to the trigger portion to form a sealing groove. Along the axial direction of the through hole, the connecting portion is arranged around the outer circumference of the through hole, and one end of the connecting portion is accommodated in the sealing groove and can abut against the side wall of the sealing groove.

8. The key structure according to claim 6, characterized in that: A conductive portion is provided on a side of the elastic portion facing away from the trigger portion, and the conductive portion is used to close a circuit on the PCB board.

9. Electric energy meter, characterized by: The key structure comprises the key structure described in any one of claims 1 to 8.

10. The electric energy meter according to claim 9, characterized in that: The electric energy meter further includes a PCB board, which is disposed in the housing and has a detection button. When the trigger part releases the detection button, the PCB board is configured such that the number of times the trigger part is separated from the detection button increases.

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