Waterproof structure of electric quantity detection instrument

Abstract

The utility model discloses a waterproof structure of an electric quantity detection instrument, which comprises a circular shell and a circuit board arranged in the shell, the shell is divided into a front shell part and a rear shell part which are detachably and fixedly connected, and the rear shell part detachably packages the rear side of the front shell part. An annular waterproof silica gel ring used for sealing is installed at the joint of the front shell part and the rear shell part. A rear positioning step surface for positioning the waterproof silica gel ring is arranged on the rear side of the inner wall of the front shell part, an inner flange is arranged on the inner wall of the rear shell part, the rear shell part is attached to the rear side of the front shell part, and the inner flange and the rear positioning step surface are attached to the inner side and the outer side of the waterproof silica gel ring in the radial direction respectively. By adopting the scheme, the waterproof silica gel ring, the front shell part and the rear shell part are uniformly stressed at the joint gaps, and the waterproof effect is uniform; and waterproof silicon rubber cases are arranged at a plurality of detachable connecting points of the front shell part and the rear shell part, so that the connecting points of the front shell part and the rear shell part can be sealed, and the sealing and waterproof performance is further guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of power detection technology, specifically, a waterproof structure for a power detection instrument. Background Technology

[0002] Waterproofing is a crucial component in electronic products, as a good waterproof structure can significantly extend the product's lifespan.

[0003] A power meter is an important instrument for measuring electrical capacity. Patent application CN110739483A discloses a lithium battery specifically designed for solar streetlights, which is equipped with a power meter. According to the patent document, moisture-proofing (waterproofing) is a key technical objective.

[0004] Referring to the aforementioned patents, the applicant also found another patent document, authorized publication number [not provided], which proposes a high-waterproof power meter, including a housing, a control circuit board disposed within the housing, and a power socket disposed on the back of the housing and electrically connected to the control circuit board. The housing includes a bottom shell, a cover plate, and a snap-on cover. The bottom shell has an upward-opening accommodating cavity, in which the control circuit board is installed. The cover plate covers the opening of the bottom shell. The snap-on cover surrounds the bottom shell and is bent upwards towards the cover plate, with a snap-on part provided. A mounting groove facing the cover plate is formed in the snap-on part, and a sealing element is provided in the mounting groove.

[0005] Taking the aforementioned patent as an example, it is a common practice in the prior art to divide the outer shell into a front shell and a rear shell, and to set a sealing ring at the joint of the front shell and the rear shell. However, the existing sealing ring design still has certain defects: if the waterproof silicone ring is designed to be axially compressed, then the separation tendency of the front shell and the rear shell caused by the axial repulsion of the waterproof silicone ring, and the bonding tendency of the fastening screw caused by the front shell and the rear shell, are opposite in direction and do not completely overlap in the positive projection direction. The combined effect of the two will cause unevenness in the joint gap between the front shell and the rear shell. Utility Model Content

[0006] The purpose of this invention is to provide a waterproof structure for an electrical power detection instrument to solve the problems existing in the prior art.

[0007] The purpose of this utility model is achieved as follows: a waterproof structure for an electrical power detection instrument, including a circular outer shell and a circuit board installed inside the outer shell. The outer shell is divided into a front shell part and a rear shell part that are detachably and fixedly connected. The rear shell part detachably encapsulates the rear side of the front shell part, and an annular waterproof silicone ring for sealing is installed at the joint between the front shell part and the rear shell part.

[0008] The rear side of the inner wall of the front shell is provided with a rear positioning stepped surface for positioning the waterproof silicone ring. The inner wall of the rear shell has an inner flange. The rear shell is attached to the rear side of the front shell. The inner flange and the rear positioning stepped surface are respectively attached to the inner and outer sides of the waterproof silicone ring in the radial direction.

[0009] Furthermore, the front shell and the rear shell also have several detachable connection points. Each detachable connection point is provided with an inner locking post, a waterproof silicone sleeve, a fastening screw, and a through hole opened in the rear shell. The inner locking post is fixed to the inner wall of the front shell and is provided with an inner locking hole. The waterproof silicone sleeve is fitted onto the end of the inner locking post. The fastening screw passes through the through hole and the waterproof silicone sleeve from the outside to the inside and is threaded with the inner locking hole of the inner locking post to fix the connection between the front shell and the rear shell.

[0010] Furthermore, the inner side of the waterproof silicone ring is provided with at least one rib extending along its length.

[0011] Furthermore, the outer side of the waterproof silicone ring is provided with at least one raised rib extending along its length.

[0012] Furthermore, the inner locking posts of all detachable connection points are distributed around the edge of the circuit board, and the edge of the circuit board is provided with several edge positioning grooves distributed along the side length direction, and the inner locking posts are inserted into the edge positioning grooves one by one.

[0013] Furthermore, the inner wall of the rear shell has several rubber sleeve positioning grooves that communicate with the fitting holes one by one. The waterproof silicone sleeve is inserted into the rubber sleeve positioning groove and seals the fitting gap between the inner locking post and the rear shell.

[0014] Furthermore, the inner locking post is coaxially arranged with the fastening screw.

[0015] Furthermore, the bottom of the edge positioning groove is an arc surface, which matches the inner locking post.

[0016] The beneficial effects of this utility model are as follows:

[0017] 1. The waterproof silicone ring is evenly stressed at the joint gap between the front shell and the rear shell, resulting in a uniform waterproof effect. Due to the radial compression of the waterproof silicone ring, the rear shell has an automatic centering effect relative to the front shell, ensuring that there will be no large gaps on the outer surface of the shell formed after assembly.

[0018] 2. Waterproof silicone sleeves are installed at several detachable connection points on the front and rear shells to seal the connection points and further ensure the sealing and waterproof performance. Attached Figure Description

[0019] Figure 1 This is an exploded view of the present invention.

[0020] Figure 2 This is a cross-sectional view of the power meter portion of this utility model.

[0021] Figure 3 yes Figure 2 Enlarged view of part A in the image. Detailed Implementation

[0022] The following will refer to the appendix in the embodiments of this utility model. Figure 1-3 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] like Figure 1-3 As shown, a waterproof structure for an electrical power detection instrument is proposed, including a circular outer shell 1 and a circuit board 2 installed inside the outer shell 1. The outer shell 1 is divided into a front shell 101 and a rear shell 102 that are detachably and fixedly connected. The rear shell 102 detachably encapsulates the rear side of the front shell 101, and an annular waterproof silicone ring 3 for sealing is installed at the joint between the front shell 101 and the rear shell 102.

[0024] like Figure 2 , 3 As shown, the rear side of the inner wall of the front shell 101 is provided with a rear positioning stepped surface 101a for positioning the waterproof silicone ring 3, and the inner wall of the rear shell 102 has an inner flange 102c. The rear shell 102 is attached to the rear side of the front shell 101, and the inner flange 102c and the rear positioning stepped surface 101a are respectively attached to the inner and outer sides of the waterproof silicone ring 3 radially.

[0025] Because a waterproof silicone ring 3 is provided at the junction of the front shell 101 and the rear shell 102, the waterproof silicone ring 3 is subjected to the squeezing action of the front shell 101 and the rear shell 102 in its radial direction.

[0026] This design has the following advantages:

[0027] If the waterproof silicone ring 3 is designed to be axially compressed, then the front shell 101 and the rear shell 102 will separate due to the axial repulsion of the waterproof silicone ring 3, and the fastening screw 6 will cause the front shell 101 and the rear shell 102 to combine. They are opposite in direction and do not overlap completely in the positive projection direction. The combined effect of the two leads to the problem of uneven joint gap between the front shell 101 and the rear shell 102.

[0028] After adopting this solution, the waterproof silicone ring 3 is subjected to uniform force at the joint gap with the front shell 101 and the rear shell 102, resulting in a uniform waterproof effect. Due to the radial compression of the waterproof silicone ring 3, the rear shell 102 has an automatic self-aligning (centering) effect relative to the front shell 101, ensuring that there will be no large discontinuity on the outer surface of the shell 1 formed after assembly between the front shell 101 and the rear shell 102.

[0029] like Figure 3 As shown, the waterproof silicone ring 3 has at least one rib 3a extending along its length on both the inner and outer sides. During installation, the rib 3a will shrink and deform under the pressure, thereby enhancing the sealing effect of the waterproof silicone ring 3.

[0030] The aforementioned front shell 101 and rear shell 102 also have several detachable connection points. Each detachable connection point is provided with an inner locking post 5, a waterproof silicone sleeve 4, a fastening screw 6, and a through hole 102a opened in the rear shell 102. The inner locking post 5 is fixed to the inner wall of the front shell 101 and is provided with an inner locking hole 5a. The inner locking post 5 is a cylindrical structure and is coaxially arranged with the fastening screw 6. The waterproof silicone sleeve 4 is fitted onto the end of the inner locking post 5. The fastening screw 6 passes through the through hole 102a and the waterproof silicone sleeve 4 from the outside to the inside (the waterproof silicone sleeve 4 is correspondingly provided with a hole to accommodate the fastening screw 6 passing through), and is threadedly engaged with the inner locking hole 5a of the inner locking post 5 to fix the connection between the front shell 101 and the rear shell 102.

[0031] The inner wall of the rear shell 102 has several rubber sleeve positioning grooves 102b that communicate with the through holes 102a one by one. The waterproof silicone sleeve 4 is inserted into the rubber sleeve positioning grooves 102b and seals the fitting gap between the inner locking post 5 and the rear shell 102.

[0032] The waterproof silicone sleeve 4 serves to seal the detachable connection point between the front shell 101 and the rear shell 102; after the fastening screw 6 is tightened, the inner locking post 5 presses the waterproof silicone sleeve 4 tightly into the sleeve positioning groove 102b.

[0033] All detachable connection points have inner locking posts 5 distributed around the edge of circuit board 2, such as Figure 1 As shown, the edge of the circuit board 2 is provided with several edge positioning grooves 2a distributed along the side length direction. The inner locking post 5 is inserted into the edge positioning groove 2a (a C-shaped groove with a narrow opening). The bottom of the edge positioning groove 2a is an arc surface and matches the inner locking post 5, thereby better defining the installation position of the circuit board 2.

[0034] refer to Figure 2 , 3 As shown, using the side-pressure waterproof silicone ring 3, compared to using an O-ring or flat washer, can achieve greater waterproof pressure with the same screw fixing force.

[0035] In other words, under the same waterproof pressure conditions, smaller diameter screws can be used, which is of great significance. In the design of small instrument housings, in order to achieve a smaller size or a larger screen ratio, the structure is often very compact. Smaller screws and supports can achieve a better structure.

[0036] The structure of this design allows for a higher waterproof rating with less interaction force between the front and rear shells.

[0037] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In this utility model, it should also be noted that the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to fixed connection, detachable connection, integral molding connection, mechanical connection, or indirect connection through intermediate connecting parts. The specific meaning of the terms in this utility model can be understood according to the specific circumstances.

[0038] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0039] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A waterproof structure for a power detection instrument, comprising a circular outer shell (1) and a circuit board (2) installed inside the outer shell (1), wherein the outer shell (1) is divided into a front shell portion (101) and a rear shell portion (102) that are detachably and fixedly connected, characterized in that: The rear shell (102) detachably encapsulates the rear side of the front shell (101), and an annular waterproof silicone ring (3) for sealing is installed at the joint between the front shell (101) and the rear shell (102). The rear side of the inner wall of the front shell (101) is provided with a rear positioning stepped surface (101a) for positioning the waterproof silicone ring (3). The inner wall of the rear shell (102) has an inner flange (102c). The rear shell (102) is attached to the rear side of the front shell (101). The inner flange (102c) and the rear positioning stepped surface (101a) are respectively attached to the inner and outer sides of the waterproof silicone ring (3) radially.

2. The waterproof structure of a power detection instrument according to claim 1, characterized in that: The front shell (101) and the rear shell (102) also have several detachable connection points. Each detachable connection point is provided with an inner locking post (5), a waterproof silicone sleeve (4), a fastening screw (6), and a through hole (102a) opened in the rear shell (102). The inner locking post (5) is fixed to the inner wall of the front shell (101) and is provided with an inner locking hole (5a). The waterproof silicone sleeve (4) is fitted onto the end of the inner locking post (5). The fastening screw (6) passes through the through hole (102a) and the waterproof silicone sleeve (4) from the outside to the inside and is threadedly engaged with the inner locking hole (5a) of the inner locking post (5) to fix the connection between the front shell (101) and the rear shell (102).

3. The waterproof structure of a power detection instrument according to claim 1, characterized in that: The waterproof silicone ring (3) has at least one rib (3a) extending along its length on its inner side.

4. The waterproof structure of a power detection instrument according to claim 3, characterized in that: The waterproof silicone ring (3) has at least one rib (3a) extending along its length on its outer side.

5. The waterproof structure of a power detection instrument according to claim 2, characterized in that: All the detachable connection points are surrounded by inner locking pins (5) around the edge of the circuit board (2). The edge of the circuit board (2) is provided with several side positioning grooves (2a) distributed along the side length direction. The inner locking pins (5) are inserted into the side positioning grooves (2a).

6. The waterproof structure of a power detection instrument according to claim 2, characterized in that: The inner wall of the rear shell (102) has several rubber sleeve positioning grooves (102b) that are connected one by one with the through holes (102a). The waterproof silicone sleeve (4) is inserted into the rubber sleeve positioning grooves (102b) and seals the fitting gap between the inner locking post (5) and the rear shell (102).

7. The waterproof structure of a power detection instrument according to claim 2, characterized in that: The inner locking pin (5) and the fastening screw (6) are coaxially arranged.

8. The waterproof structure of a power detection instrument according to claim 5, characterized in that: The bottom of the side positioning groove (2a) is an arc surface, which matches the inner locking post (5).

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