Pre-embedded junction box

Abstract

The utility model discloses a pre-embedded junction box, the side wall of a box body is provided with a plurality of junction holes covered by knock-off sheets, the knock-off sheets are connected with the junction holes through thin layers, the thin layers seal the connection parts between the knock-off sheets and the junction holes, the thin layers and the box body are in an integral one-step injection molding structure, and the thickness of each thin layer is 0.1-0.4 mm. And particularly, the thickness of the copper wire is 0.2-0.3 mm. And the connection part between the knock-off sheet and the wiring hole is connected and sealed through the thin layer with the specific thickness, so that the knock-off sheet is ensured to be easily knocked off, and meanwhile, cement mortar is effectively prevented from leaking into the box body.

Description

Technical Field

[0001] The utility model relates to an embedded junction box in a building electrical pipeline project. Background Art

[0002] In electrical installation, junction boxes (generally called 86-type installation boxes in the market) need to be embedded in the interior walls of buildings, and then wiring operations are carried out. Then, a panel is covered on the box body, and the mounting holes on both sides of the panel are fixedly connected to the nuts on the box body through screws. A plurality of wiring holes covered by knock-out pieces are provided on the side wall of the box body, and the knock-out pieces and the wiring holes are connected by a plurality of ribs. Before embedding, it is very easy to knock off the knock-out pieces to expose the wiring holes, which is convenient for threading the wire pipes according to needs for wiring operations. As an electrical appliance that has been applied for many years and has a huge usage amount, its structure has been standardized and fixed.

[0003] However, we found that the existing drawbacks of the junction box are that there are many gaps between the connecting ribs of the knock-out pieces and the wiring holes. These gaps will cause the cement mortar for fixing the junction box on the outside to enter the box body. The cement mortar is pressed and solidified in the box body and is difficult to remove, occupying the space inside the box, affecting the wiring construction and being not beautiful. Moreover, the embedding operation of the existing junction box is very inconvenient. It is necessary to nail nails on the concrete pouring templates on both sides of the box body to fix the two ends of the tie straps, and then use the tie straps to bind and fix the box body. The operation is inconvenient, the positioning is unreliable, and the construction efficiency is affected. Summary of the Utility Model

[0004] In order to solve the above drawbacks, the technical problem to be solved by the utility model is to provide an embedded junction box that can effectively prevent cement mortar from leaking into the box body. To solve the above technical problem, the technical solution adopted by the utility model is an embedded junction box. A plurality of wiring holes covered by knock-out pieces are provided on the side wall of the box body. It is characterized in that the knock-out pieces and the wiring holes are connected by a thin layer, the thin layer seals the connecting part between the knock-out pieces and the wiring holes, the thin layer and the box body are an integrally injection-molded structure, and the thickness of the thin layer is 0.1 - 0.4 mm, especially 0.2 - 0.3 mm.

[0005] The beneficial effect of the utility model is that the connecting part between the knock-out pieces and the wiring holes is connected and sealed by a thin layer with a specific thickness, ensuring that the knock-out pieces are easily knocked off while effectively preventing cement mortar from leaking into the box body.

[0006] In an embodiment, the thin layer is close to the inner side wall of the box body, and the connecting part between the knock-out pieces and the wiring holes on the outer side wall of the box body has a structure of an annular groove, which is more convenient for knocking off.

[0007] In one embodiment, a reinforcing ring is provided on the outer side surface of the box body at the outer periphery of the thin layer. The reinforcing ring improves the structural strength of the outer side surface of the box body, increases the difference in structural strength between the box body and the thin layer, and makes the knocking-off operation more convenient; at the same time, after the wire pipe penetrates into the wiring hole, the reinforcing ring is wound around the outer periphery of the wire pipe, which is beneficial to preventing cement mortar from entering the box body through the gap between the wire pipe and the wiring hole.

[0008] In one embodiment, positioning through holes are respectively provided at the four corners of the open end surface of the box body. During the embedding operation of the junction box, nails are used to pass through the positioning through holes to fix the junction box on the concrete casting formwork. The planar positioning of the box body on the wall surface is standard and accurate, and the embedding installation of the junction box can be conveniently and reliably realized.

[0009] In one embodiment, connectors are provided on two opposite outer side walls of the box body. It is convenient for multiple box bodies to be connected side by side in multiple positions for embedding installation. Further, the connector includes a hanging hook at the lower end of the box body and a plug-in part at the upper end of the box body. The connection is convenient and reliable.

[0010] Of course, it is not necessary for any product implementing the present invention to simultaneously achieve all the above-mentioned advantages.

[0011] In the description of this specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0012] It should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 to the present invention.

[0013] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0014] In the present utility model, unless otherwise clearly specified and defined, terms such as "installed", "connected", "joined", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0015] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0016] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it may be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the first perspective of the embodiment;

[0018] Figure 2 is a schematic structural diagram of the second perspective of the embodiment;

[0019] Figure 3 is Figure 1 a partially enlarged sectional structural diagram of the A-A plane shown. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] See the appendix Figures 1-3 , which reflects a specific structure of the present utility model. On the side wall of the box body 1 of the embedded junction box, there are a number of wiring holes 3 sealed by knock-out pieces 2. The size of the wiring holes 3 matches that of the wire pipes (not shown in the figure). The wiring holes 3 and their knock-out pieces 2 are all provided as spares on the side and bottom of the box body 1, so as to facilitate the construction personnel to flexibly select and apply. Before embedding, knock out the corresponding knock-out pieces 2 on the box body according to the pipeline direction in the wall to expose the wiring holes 3 for threading the wire pipes for wiring operations. After the wire pipes are inserted, the wiring holes 3 will be sealed (such as bundling with tape) to prevent the cement mortar for fixing the junction box externally from entering the box body 1. However, if there is a gap between the unused wiring holes 3 and the knock-out pieces 2, it is very easy for the cement mortar to enter the box body 1.

[0021] In the example, the connecting part between the knock-out piece 2 and the wiring hole 3 - the circular gap is connected by a thin layer 4, and the thin layer 4 completely seals the circular gap, thus effectively preventing the cement mortar from leaking into the box body 1. However, since the thin layer 4 and the box body 1 are integrally injection-molded at one time, and the thin layer 4 is connected to the box body 1 comprehensively, rather than the partial connection of the existing rib connection, it is very easy to have the situation that the knock-out is not easy, or the crack spreads during the knock-out, resulting in the damage of the box body outside the thin layer. We accidentally found in years of production practice that the thickness of the thin layer 4 is set to 0.1 - 0.4 mm, especially 0.2 - 0.3 mm. The thin layer 4 with this thickness can ensure that the knock-out piece 4 is easily knocked out; and it will not cause damage to the box body 1 outside the thin layer.

[0022] This technical solution takes into account the sealing requirements of the unused wiring holes and the easy knock-out property of the used wiring holes, so it better meets the use requirements. At the same time, the injection molding yield rate is 100%, which is suitable for large-scale production.

[0023] In the example, the thin layer 4 is close to the inner side wall of the box body 1 and far from the outer side wall of the box body 1, so that the circular gap connecting part on the outer side wall of the box body 1 presents a structure of an annular groove. It is more convenient for knock-out.

[0024] In the example, a reinforcing ring 5 is provided on the outer side surface of the box body 1 at the outer peripheral edge of the thin layer 4 of some of the wiring holes 3. The reinforcing ring 5 improves the structural strength of the outer side surface of the box body 1, increases the structural strength difference between the box body 1 and the thin layer 4, and is more convenient for knock-out operations; at the same time, after the wire pipe is inserted into the wiring hole 3 without the knock-out piece 2, the reinforcing ring 5 is hoop-shaped around the outer periphery of the wire pipe, which is beneficial to preventing the cement mortar from entering the box body 1 from the gap between the wire pipe and the wiring hole 3.

[0025] In the example, positioning through holes 6 are respectively arranged at the four corners of the opening end face of the box body 1. During the pre-burial operation of the junction box, nails are used to pass through the positioning through holes 6 to fix the box body 1 on a concrete casting formwork (not shown in the figure). Compared with the existing cable tie bundling method, the planar positioning of the box body 1 on the wall surface is more standard and accurate, facilitating the reliable realization of the pre-burial installation of the junction box.

[0026] In the example, connecting pieces are provided on two opposite outer side walls of the box body 1. This facilitates the multi-position parallel connection of multiple box bodies 1 for pre-burial installation. In the example, the connecting pieces include a hook member 7 and a hanging member 8 at the lower end of the box body 1, and a sleeve member 9 and a plug member 10 at the upper end of the box body 1. During use, first, the hook member 7 and the hanging member 8 of the first box body are correspondingly and cooperatively hooked and connected with the hanging member 8 and the hook member 7 of the adjacent second box body, and then the sleeve member 9 and the plug member 10 of the first box body are respectively sleeved and connected with the plug member 10 and the sleeve member 9 of the second box body. The connection is convenient and reliable.

[0027] The embodiments of the present utility model disclosed above are only used to help illustrate the present utility model. The embodiments do not elaborate on all details and do not limit the present utility model to only the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. This specification selects and combines the drawings to specifically describe these embodiments in order to better explain the principle and practical application of the present utility model, so that those skilled in the art can well understand and utilize the present utility model. However, the present utility model can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is only limited by the claims and their full scope and equivalents, and is not limited by the disclosed specific embodiments.

Claims

1. A pre-buried junction box, wherein the side wall of the box body is provided with a plurality of wiring holes covered by knock-off plates, characterized in that: The knock-off piece and the wiring hole are connected via a thin layer, the thin layer seals the connection between the knock-off piece and the wiring hole, the thin layer and the box body are an integral one-time injection molding structure, and the thickness of the thin layer is 0.1 to 0.4 mm.

2. The embedded junction box according to claim 1, characterized in that: The thickness of the thin layer is 0.2-0.3 mm.

3. A pre-buried junction box according to claim 1 or 2, characterized in that: The thin layer is close to the inner side wall of the box body, and the connection portion between the knock-off piece on the outer side wall of the box body and the wiring hole is in the structure of an annular groove.

4. A pre-buried junction box as claimed in claim 1 or 2, characterized in that: A reinforcement ring is provided on the outer side surface of the box body at the outer periphery of the thin layer.

5. The embedded junction box according to claim 3, characterized in that: A reinforcement ring is provided on the outer side surface of the box body at the outer periphery of the thin layer.

6. A pre-buried junction box as claimed in any one of claims 1, 2 and 5, characterized in that: Connecting pieces are arranged on two opposite outer side walls of the box body.

7. The embedded junction box according to claim 6, characterized in that: The connecting piece comprises a hooking piece at the lower end of the box body and a sleeve plug-in piece at the upper end of the box body.

8. The embedded junction box according to any one of claims 1, 2, 5 and 7, characterized in that: Positioning through holes are respectively arranged at the four corners of the opening end surface of the box body.

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