Electric energy metering box with multiple sealing structures

Abstract

The utility model belongs to the field of electric energy metering boxes, and particularly relates to an electric energy metering box with multiple sealing structures, which comprises a box body and a box door hinged on the box body, a door frame is arranged on the box body, and at least two mutually independent and parallel sealing strip mounting structures are arranged on the door frame along the closed circumferential direction. A first sealing strip and a second sealing strip are respectively embedded in the sealing strip mounting structure; when the box door is closed, the first sealing strip and the second sealing strip are compressed, and at least two continuous sealing barriers which are sequentially arranged in the medium invasion direction are formed between the box door and the door frame. At least two independent sealing barriers are adopted to form a physical isolation area, even if one of the sealing barriers is aged or damaged to cause performance reduction, the other sealing barrier can still provide effective sealing, the main sealing barrier provides basic strong sealing, the secondary sealing barrier provides dynamic supplementary sealing, and the two sealing barriers cooperate to gradually block dust, moisture and the like, so that the service life of the sealing barrier is prolonged. And the protection level can reach IP65 and above.

Description

Technical Field

[0001] This utility model belongs to the technical field of electricity metering boxes, specifically relating to an electricity metering box with a multi-seal structure. Background Technology

[0002] Electricity metering boxes are critical infrastructure components in power grids used to install metering equipment such as electricity meters and instrument transformers. They are widely installed in diverse environments, including outdoors, basements, and corridors. Their sealing performance directly affects the safe and stable operation of the internal precision electrical components and the accuracy of metering.

[0003] Current energy metering boxes generally use a single sealing strip (mostly a rubber strip) to seal the door and the box body. This single sealing method has significant drawbacks: First, under long-term exposure to sunlight, rain, and temperature cycles, the sealing strip is prone to aging and deformation, leading to decreased elasticity and gaps in the seal. Second, its protection against dust, humid air, and even small insects is limited, especially in areas with sandstorms, coastal salt spray, or rainy seasons, where a single seal cannot meet the requirements for long-term high protection levels (such as IP54 and above). Finally, uneven force when the door is locked can easily lead to insufficient compression of the sealing strip in certain areas, creating leakage points. Therefore, there is an urgent need for an energy metering box sealing solution that is more reliable, has a longer lifespan, and can withstand harsh environments. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide an energy metering box with a multi-seal structure that is more reliable in sealing, has a longer service life, and can adapt to harsh environments.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: an energy metering box with a multi-seal structure includes a box body and a door hinged to the box body. The box body is provided with a door frame, and the door frame is provided with at least two independent and parallel sealing strip mounting structures along the closed circumference. A first sealing strip and a second sealing strip are respectively embedded in the sealing strip mounting structures. When the box door is closed, both the first sealing strip and the second sealing strip are compressed, forming at least two continuous sealing barriers arranged sequentially along the medium intrusion direction between the box door and the door frame.

[0006] In some embodiments, the first sealing strip is a solid circular or elliptical cross-section sealing strip, constituting the primary sealing barrier; the second sealing strip is a D-shaped or P-shaped cross-section sealing strip, constituting the secondary sealing barrier.

[0007] In some embodiments, the first sealing strip and the second sealing strip are made of different materials and / or have different hardness.

[0008] In some embodiments, the first sealing strip is made of EPDM rubber, and the second sealing strip is made of silicone rubber.

[0009] In some embodiments, a third sealing structure is also provided on the door between the first sealing strip and the second sealing strip. The third sealing structure is a comb-shaped or fin-shaped physical blocking strip.

[0010] In some embodiments, the sealing surface of the door frame is provided with a guide slope, which is configured to guide the displacement of the door during the closing process and convert the closing force into a vertical compressive force on the first and second sealing strips.

[0011] In some embodiments, at least one drainage microhole leading to the outside of the housing is provided at the bottom of the isolation cavity formed by the first sealing strip and the second sealing strip.

[0012] In some embodiments, the at least two sealing strip mounting structure comprises a first sealing groove and a second sealing groove formed on the door frame.

[0013] The first sealing strip and the second sealing strip are respectively embedded in the first sealing groove and the second sealing groove.

[0014] In some embodiments, the door is provided with a multi-point linkage locking mechanism for simultaneously applying a balanced clamping force at multiple positions along the circumference of the door when it is closed.

[0015] The beneficial effects of this invention are as follows: At least two independent sealing barriers form a physical isolation zone. Even if one barrier degrades in performance due to aging or damage, the other can still provide an effective seal, greatly improving the overall reliability and fault tolerance of the system. The main and secondary sealing strips use different cross-sectional shapes and materials, leveraging their respective advantages. The main seal provides a basic strong seal, while the secondary seal provides a dynamic supplementary seal. Together, they progressively block dust and moisture, achieving a protection level of IP65 or higher. The guide bevel design makes the sealing strip more rationally stressed, reducing abnormal wear; the drainage micropores can expel moisture and slow down internal corrosion; multi-point locking ensures uniform pressure. These designs collectively extend the service life of the sealing system. The sealing strips are installed using a groove-embedded method. If a single strip is damaged, it can be replaced independently without overall disassembly and repair, reducing maintenance costs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0017] Figure 1 This is a front view of an embodiment of the present utility model;

[0018] Figure 2 This is a cross-sectional view of an embodiment of the present utility model;

[0019] Figure 3 for Figure 2 Enlarged view of section A. Detailed Implementation

[0020] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0022] The directional and positional terms used in this utility model, such as up, down, front, back, left, right, inside, outside, top, bottom, side, etc., are only for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0023] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments:

[0024] like Figure 1-3As shown, an energy metering box with a multi-layer sealing structure includes a box body 1 and a door 2 hinged to the box body 1. The box body 1 has a door frame 11, and at least two independent and parallel sealing strip mounting structures 12 are arranged along the closed circumference of the door frame 11. A first sealing strip 13 and a second sealing strip 14 are respectively embedded in the sealing strip mounting structures 12. When the door 2 is closed, both the first sealing strip 13 and the second sealing strip 14 are compressed, forming at least two continuous sealing barriers arranged sequentially along the direction of media intrusion between the door 2 and the door frame 11. By setting at least two independent and parallel sealing strips, multiple continuous sealing barriers are formed along the direction of media intrusion (such as rainwater and dust), significantly improving the overall sealing level of the metering box. Since each sealing strip mounting structure is independent, even if one sealing strip fails due to aging, deformation, or partial damage, the other sealing strips can still provide effective sealing, enhancing the reliability and service life of the sealing system. The design of the sealing barriers, arranged sequentially along the direction of media intrusion, effectively blocks and attenuates the permeation pressure of external media in stages. For example, it first blocks liquid water, then isolates water vapor and dust, providing more layered and effective protection. The first sealing strip 13 is a solid circular or elliptical cross-section sealing strip, forming the main sealing barrier; the second sealing strip 14 is a D-shaped or P-shaped cross-section sealing strip, forming the secondary sealing barrier. Using a solid circular / elliptical cross-section first sealing strip as the main seal provides good compression resilience and stable, long-lasting high contact pressure, ensuring the core sealing effect. Using a D-shaped or P-shaped cross-section second sealing strip as the secondary seal allows for easier deformation and fit of the lip structure, has a high tolerance for surface unevenness, and effectively compensates for any microscopic gaps that may exist in the main seal, forming a complementary performance. The first sealing strip 13 and the second sealing strip 14 are made of different materials and / or have different hardnesses. By using sealing strips of different materials and / or hardnesses, material optimization can be performed to meet the functional requirements of different sealing barriers. For example, the main seal can be made of highly elastic, weather-resistant materials, while the secondary seal can be made of softer, more conformable materials, thus achieving a better overall sealing synergy and wider environmental adaptability. The first sealing strip 13 is made of EPDM rubber, and the second sealing strip 14 is made of silicone rubber. The main seal uses EPDM rubber, which has excellent weather resistance, ozone aging resistance, and mechanical properties, ensuring the long-term reliability of the main barrier. The secondary seal uses silicone rubber, which has a wider range of high and low temperature resistance and better insulation, enhancing the sealing stability and electrical safety under extreme temperatures. The combination of the two results in outstanding overall performance. In the sealing area between the first sealing strip 13 and the second sealing strip 14, a third sealing structure 15 is also provided; the third sealing structure 15 is a comb-shaped or fin-shaped physical barrier strip fixed to the door 2. The addition of a comb-shaped or fin-shaped physical barrier strip between the first and second sealing strips constitutes a composite sealing structure of "airtightness + physical barrier".This physical barrier can effectively disrupt, block, and trap the small amount of airflow or water droplets that have passed through the first seal, greatly improving the resistance to media driven by pressure difference (such as wind-driven rain and dust), resulting in a better sealing effect.

[0025] like Figure 3 As shown, a guide slope 111 is provided on the sealing surface of the door frame 11. The guide slope 111 is configured to guide the displacement of the door 2 during the closing process and convert the closing force into a vertical compressive force on the first sealing strip 13 and the second sealing strip 14. Adding comb-shaped or fin-shaped physical blocking strips between the first and second sealing strips constitutes a composite sealing structure of "airtightness + physical barrier". This physical barrier can effectively disrupt, block, and intercept a small amount of airflow or water droplets that have passed through the first seal, greatly improving the resistance to media driven by pressure difference (such as wind-borne rain and dust), resulting in a better sealing effect. At the bottom of the isolation cavity 100 formed by the first sealing strip 13 and the second sealing strip 14, at least one drainage microhole 16 leading to the outside of the housing 1 is provided. The drainage microhole at the bottom of the isolation cavity formed by the two seals creates an "equal pressure cavity" or "drainage channel" effect. Even if a small amount of moisture seeps into the first seal, it can be promptly discharged outside the box through micropores, avoiding the risk of moisture accumulating inside the sealed cavity and breaching the second seal. This achieves a combination of "drainage and sealing," enhancing the stability of the waterproofing. The at least two sealing strip installation structures 12 consist of a first sealing groove 121 and a second sealing groove 122 formed on the door frame 11. The first sealing strip 13 and the second sealing strip 14 are respectively embedded within the first sealing groove 121 and the second sealing groove 122. The specific first and second sealing grooves in the sealing strip installation structure make the structural design clear and easy to manufacture. The embedding method is reliable and secure, effectively preventing the sealing strip from shifting or falling off during use, ensuring the accuracy of the sealing position.

[0026] like Figure 1 and 2 As shown, the door 2 is equipped with a multi-point linkage locking mechanism 3, which is used to simultaneously apply a balanced clamping force at multiple positions along the circumference of the door 2 when it is closed. The multi-point linkage locking mechanism can provide a balanced clamping force simultaneously at multiple positions along the circumference of the door. This avoids problems such as door twisting and insufficient local sealing pressure caused by single-point locking or insufficient locking points, and ensures that the sealing strip on the entire sealing circumference can obtain a consistent and sufficient amount of compression, thereby giving full play to the effectiveness of the multi-seal design.

[0027] The working principle of this utility model is as follows: When the cabinet door 2 is closed and locked, the multi-point linkage locking mechanism 3 provides a uniform closing force, which, through the transformation of the guide inclined surface 111, vertically and evenly compresses the first sealing strip 13 (main seal) and the second sealing strip 14 (secondary seal), forming two elastic sealing defense lines. The comb-shaped third sealing structure 15 located between the two provides rigid physical blocking and turbulence. The intruding medium needs to overcome the comb-shaped turbulence, the lip seal of the secondary sealing strip, and the compression seal of the main sealing strip in sequence before it can enter the cabinet, making the possibility extremely low. Even if the main sealing strip ages slightly after long-term use, the flexible secondary sealing strip can still provide effective compensation. The drainage micropores 16 at the bottom of the isolation cavity ensure the dryness of the cavity.

[0028] This invention employs at least two independent sealing barriers to form a physical isolation zone. Even if one barrier degrades in performance due to aging or damage, the other can still provide an effective seal, greatly improving the overall reliability and fault tolerance of the system. The main and secondary sealing strips use different cross-sectional shapes and materials to leverage their respective advantages. The main seal provides a basic strong seal, while the secondary seal provides a dynamic supplementary seal. Together, they progressively block dust and moisture, achieving a protection level of IP65 or higher. The guide bevel design ensures more reasonable stress distribution on the sealing strip, reducing abnormal wear; the drainage micropores allow moisture to escape, slowing internal corrosion; and multi-point locking ensures uniform pressure. These designs collectively extend the service life of the sealing system. The sealing strips are installed using a groove-embedded method; if a single strip is damaged, it can be replaced independently without requiring overall disassembly and repair, reducing maintenance costs.

[0029] The above description is only one embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model; the scope of protection of the present utility model is defined by the claims in the claims, and all equivalent changes and modifications made in accordance with the utility model are within the scope of protection of the present utility model patent.

Claims

1. An electricity metering box with a multi-seal structure, comprising a box body and a door hinged to the box body, wherein the box body is provided with a door frame, characterized in that: The door frame is provided with at least two independent and parallel sealing strip installation structures along the closed circumference, and a first sealing strip and a second sealing strip are respectively embedded in the sealing strip installation structure; when the box door is closed, the first sealing strip and the second sealing strip are compressed, forming at least two continuous sealing barriers between the box door and the door frame, arranged sequentially along the medium intrusion direction.

2. The power metering box with multi-seal structure according to claim 1, characterized in that: The first sealing strip is a solid circular or elliptical cross-section sealing strip, forming the main sealing barrier; the second sealing strip is a D-shaped or P-shaped cross-section sealing strip, forming the secondary sealing barrier.

3. The power metering box with a multi-seal structure according to claim 2, characterized in that: The first sealing strip and the second sealing strip are made of different materials and / or have different hardness.

4. The power metering box with multi-seal structure according to claim 3, characterized in that: The first sealing strip is made of EPDM rubber, and the second sealing strip is made of silicone rubber.

5. The power metering box with a multi-seal structure according to any one of claims 1-4, characterized in that: A third sealing structure is also provided in the sealing area between the first sealing strip and the second sealing strip; the third sealing structure is a comb-shaped or fin-shaped physical blocking strip fixed to the door.

6. The power metering box with a multi-seal structure according to claim 1, characterized in that: The sealing surface of the door frame is provided with a guide slope, which is configured to guide the displacement of the door during the closing process and convert the closing force into a vertical compressive force on the first and second sealing strips.

7. The power metering box with a multi-seal structure according to claim 1, characterized in that: At the bottom of the isolation cavity formed by the first sealing strip and the second sealing strip, at least one drainage microhole leading to the outside of the box is provided.

8. The power metering box with a multi-seal structure according to claim 1, characterized in that: The at least two sealing strips are installed in a first sealing groove and a second sealing groove on the door frame. The first sealing strip and the second sealing strip are respectively embedded in the first sealing groove and the second sealing groove.

9. The power metering box with a multi-seal structure according to claim 1, characterized in that: The door is equipped with a multi-point linkage locking mechanism, which is used to apply a balanced clamping force simultaneously at multiple positions along the circumference of the door when it is closed.

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