Three-phase four-wire electric energy metering combined junction box

Abstract

The utility model relates to a three-phase four-wire electric energy metering combined junction box, which comprises a base, a detachable anti-theft cover arranged on the base, a bottom plate sealed at the bottom of the base, and a neutral line connecting group, at least three current connecting groups and at least four fuse connecting groups arranged at the bottom of the base and arranged between the base and the bottom plate, the neutral line connecting group is located at the top end of one side of the bottom of the base, and the fuse connecting groups and the current connecting groups are alternately arranged at adjacent positions of one side of the neutral line connecting group and extend to the top end of the other side of the base. According to the utility model, the key components such as the neutral line connecting group, the current connecting group and the fuse connecting group are integrated between the base and the bottom plate, so that the compactness of the structure is realized, the design of the detachable anti-theft cover effectively prevents unauthorized access and tampering, and the safety of equipment is enhanced; the anti-theft cover made of a transparent material enables a user to visually observe the internal state of the junction box, thereby facilitating daily maintenance and troubleshooting.

Description

Technical Field

[0001] This utility model relates to the field of junction box technology, and in particular to a three-phase four-wire power metering junction box. Background Technology

[0002] In power systems, three-phase four-wire power metering junction boxes are devices used to connect and distribute electrical energy. They are widely used in various power metering and distribution systems. Traditional three-phase four-wire power metering junction boxes suffer from problems such as complex structure, inconvenient installation and maintenance, and insufficient safety performance. Firstly, the complex internal structure of traditional junction boxes, with various connecting components and wires intertwined, poses significant difficulties for installation and maintenance, increasing installation costs and reducing work efficiency. Secondly, in terms of security, traditional junction boxes lack effective anti-theft and anti-tampering measures. Some criminals may attempt to steal electricity or engage in other illegal activities by damaging the junction box, posing risks to power supply and potentially threatening user safety. Furthermore, traditional junction boxes are inadequate in observing and monitoring power metering. Due to the enclosed nature of the junction box's internal structure, it is difficult for staff to directly understand the actual power metering situation, causing inconvenience to the operation and maintenance of the power system. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a three-phase four-wire power metering junction box that is compact, safe, reliable and easy to maintain.

[0004] To achieve the above objectives, this utility model employs a three-phase four-wire power metering junction box, including a base with a removable anti-theft cover. A bottom plate is sealed at the bottom of the base. Between the base and the bottom plate, there is a neutral line connection group installed at the bottom of the base, as well as at least three current connection groups and at least four fuse connection groups. The neutral line connection group is located at the top of one side of the bottom of the base. Fuse connection groups and current connection groups are alternately arranged at adjacent positions on one side of the neutral line connection group, extending to the top of the other side of the base.

[0005] The advantages of the above structure are as follows: by integrating key components such as the neutral connection group, current connection group, and fuse connection group between the base and the bottom plate, the structure is compact; the removable anti-theft cover design effectively prevents unauthorized access and tampering, enhancing the security of the equipment; the transparent anti-theft cover allows users to intuitively observe the internal status of the junction box, facilitating daily maintenance and troubleshooting; and the design of at least three current connection groups and at least four fuse connection groups provides sufficient flexibility to adapt to power metering systems of different sizes and needs.

[0006] This utility model further comprises a fuse busbar and a fuse holder for each fuse connection group. The fuse busbar includes a first fuse busbar and a second fuse busbar arranged opposite to each other. A first combination head screw and a second combination head screw are respectively inserted into the first and second fuse busbars. The fuse holder includes a first fuse holder mounted on the first combination head screw and a second fuse holder mounted on the second combination head screw. A fuse is installed between the first and second fuse holders. The fuse holder is fixed to the fuse busbar by the combination head screws, making fuse installation and removal simple and quick. This design reduces the time and tools required during installation, improving work efficiency. The use of combination head screws not only provides a stable fixing effect but also effectively prevents the fuse holder from loosening due to vibration or external force during long-term use. When the fuse blows due to overload or other reasons, the user can easily replace the fuse by removing the combination head screws without extensive disassembly of the entire junction box.

[0007] This utility model is further configured such that each current connection group includes a current busbar and a current shorting piece. One end of the current shorting piece forms a U-shape, and the other end is connected to an indicator. A waist-shaped hole is formed in the middle of the current shorting piece. The current busbar includes a first current busbar, a second current busbar, and a third current busbar arranged in parallel in sequence. The current shorting piece includes a first current shorting piece and a second current shorting piece. A first washer screw and a second washer screw are respectively inserted on the first and third current busbars. A third washer screw and a fourth washer screw are inserted on the second current busbar. The waist-shaped hole of the first current shorting piece is connected to the third washer screw of the second current busbar. The U-shape of the first current shorting piece is connected to the second washer screw of the third current busbar. The waist-shaped hole of the second current shorting piece is connected to the fourth washer screw of the second current busbar. The U-shape of the second current shorting piece is not connected to the first washer screw of the first current busbar. The design of the current jumper allows for flexible connection between current busbars. This design allows users to selectively connect or disconnect different current paths according to actual needs, thereby meeting different power metering and distribution requirements. The current jumper connects to the washer screw on the current busbar through a waist-shaped hole. This connection method ensures the reliability and stability of electrical contact. The waist-shaped hole design also allows for some adjustment space to accommodate screws of different sizes and installation conditions. The U-shaped part and indicator design on the current jumper allow users to intuitively observe the current connection status.

[0008] This utility model is further configured such that the neutral line connection assembly includes a neutral line copper busbar and a long connecting piece. One end of the long connecting piece forms a U-shaped portion, and the other end is connected to an indicator. A waist-shaped hole is formed in the middle of the long connecting piece. The neutral line copper busbar includes a first neutral line copper busbar and a second neutral line copper busbar arranged opposite to each other. A first shorting screw and a second shorting screw are respectively inserted on the first neutral line copper busbar and the second neutral line copper busbar. The waist-shaped hole of the long connecting piece is connected to the second shorting screw of the second neutral line copper busbar, and the U-shaped portion of the long connecting piece is connected to the first shorting screw of the first neutral line copper busbar. The design of the long connecting piece allows for flexible connection between neutral copper busbars, enabling users to selectively connect or disconnect the neutral line path according to actual needs. The long connecting piece connects to the shorting screw on the neutral copper busbar through the oblong hole, ensuring the reliability and stability of electrical contact. The oblong hole design provides adjustment space to accommodate screws of different sizes and installation conditions, thereby enhancing the strength of the connection. The U-shaped part and indicator design on the long connecting piece allow users to intuitively observe the status of the neutral line connection.

[0009] This utility model further includes wiring screws inserted into the fuse busbars, current busbars, and neutral busbars of each fuse connection group, current connection group, and neutral connection group. The addition of these wiring screws ensures a secure connection between the wires and the busbars, reducing the risk of circuit failures due to loose connections and improving the overall reliability and stability of the junction box.

[0010] This utility model is further configured such that the base has a mounting cavity at one end corresponding to the anti-theft cover. The mounting cavity contains slots for inserting combination head screws, washer screws, shorting screws, and wiring screws into the fuse copper busbar, current copper busbar, and neutral copper busbar at the bottom of the base. By pre-setting various screws within the mounting cavity, users can quickly locate and install the required screws, greatly improving installation efficiency and reducing errors and inconvenience during the installation process.

[0011] This utility model is further configured with a partition plate forming within the mounting cavity to separate each fuse connection group, each current connection group, and the neutral connection group. The mounting cavity also has a first groove and a second groove perpendicular to the current busbar for each current connection group. The first current shorting piece and the second current shorting piece are respectively disposed within the first groove and the second groove. The partition plate design clearly defines and separates each fuse connection group, each current connection group, and the neutral connection group, avoiding confusion and overlap of internal components. This helps improve the neatness and orderliness of the junction box's internal layout, allowing users to more clearly understand the internal structure and component connections. The first groove and the second groove provide convenient channels for the installation and adjustment of the first current shorting piece and the second current shorting piece.

[0012] This utility model further features an anti-theft cover with a first limiting block and a second limiting block at one end of the base mounting cavity, corresponding to each group of current connections. The first limiting block is located in the first sliding groove and is adjacent to the indicator on the first current shorting piece. The second limiting block is located in the second sliding groove and maintains a certain distance from the edge of the oblong hole of the second current shorting piece. By placing the first limiting block adjacent to the indicator on the first current shorting piece, it is ensured that the current shorting piece will not move or shake excessively within the sliding groove, thereby improving the stability and reliability of the current connection. At the same time, this design also helps prevent the current shorting piece from falling off or being damaged due to external forces, enhancing the safety of the junction box. The second limiting block maintaining a certain distance from the edge of the oblong hole of the second current shorting piece allows the second current shorting piece to have a certain adjustment range within the second sliding groove, making it convenient for users to adjust the position of the current shorting piece according to actual needs. Furthermore, the distance ensures that the current shorting piece is firmly fixed within the sliding groove, preventing displacement or loosening.

[0013] This utility model is further configured such that both ends of the anti-theft cover are equipped with lead-sealed screws for fixing the base. The base has a fixing groove corresponding to the lead-sealed screw, and one side of the lead-sealed screw has a foolproof limiting post. The lead-sealed screws effectively fix the base, preventing unauthorized personnel from opening the junction box at will, thereby protecting the internal current connection group and other important components from unauthorized alteration or damage. The foolproof limiting post design prevents accidental operation when installing or removing the lead-sealed screws.

[0014] This utility model is further configured with an anti-theft cover made of transparent material. The transparent material allows users or maintenance personnel to directly observe the status of key components such as the internal current connection group, fuse connection group, and neutral connection group without opening the junction box. This helps to promptly identify potential problems or faults and thus take timely maintenance measures. Attached Figure Description

[0015] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0016] Figure 2 This is a top view of an embodiment of the present invention after the top cover has been removed.

[0017] Figure 3 This is a schematic diagram of the structure of the neutral line connection group according to an embodiment of the present utility model.

[0018] Figure 4 This is a schematic diagram of the structure of the long connecting piece according to an embodiment of the present invention.

[0019] Figure 5 This is a schematic diagram of the fuse connection assembly according to an embodiment of the present invention.

[0020] Figure 6 This is a schematic diagram of the current connection group according to an embodiment of the present invention.

[0021] Figure 7 This is a schematic diagram of the structure of the current shorting piece according to an embodiment of the present invention.

[0022] Figure 8 This is a schematic diagram of another fuse connection group according to an embodiment of the present invention.

[0023] Figure 9 This is an exploded view of the structure of an embodiment of this utility model.

[0024] Figure 10 This is a top view of the base according to an embodiment of the present utility model.

[0025] Figure 11 This is a three-dimensional schematic diagram of the anti-theft cover according to an embodiment of this utility model. Detailed Implementation

[0026] like Figures 1-11 As shown, an embodiment of this utility model provides a three-phase four-wire power metering junction box, which is provided with a base 1, a removable anti-theft cover 2 covering the base 1, and a bottom plate 3 sealing the bottom of the base 1, forming a closed space for installing various connection components.

[0027] The neutral line connection group 4 is located at the top of one side of the bottom of the base 1 and is the connection point of the neutral line in the power system. The neutral line connection group 4 consists of a neutral line copper busbar and a long connecting piece 42. The neutral line copper busbar includes a first neutral line copper busbar 40 and a second neutral line copper busbar 41 arranged opposite to each other. One end of the long connecting piece 42 forms a U-shaped part 421, and the other end is connected to an indicator 422. A waist-shaped hole 423 is formed in the middle of the long connecting piece 42. A first shorting screw 43 and a second shorting screw 44 are respectively inserted on the first neutral line copper busbar 40 and the second neutral line copper busbar 41. The long connecting piece 42 passes through the waist-shaped hole 423. The second shorting screw 44 is connected to the second neutral copper busbar 41, and the U-shaped part 421 of the long connecting piece 42 is connected to the first shorting screw 43 of the first neutral copper busbar 40. Fuse connection group 5 and current connection group 6 are alternately arranged on one side of the neutral connection group 4. These components extend from the top of one side of the base 1 to the top of the other side. The fuse connection group 5 has four groups, namely fuse group A 5a, fuse group B 5b, fuse group C 5c and fuse group D 5d. The current connection group 6 has three groups, namely current group A 6a, current group B 6b and current group C 6c.

[0028] Each fuse connection group 5 consists of a fuse busbar, a fuse holder, and a fuse 50. The fuse busbar includes a first fuse busbar 51 and a second fuse busbar 52 arranged opposite to each other. A first combination head screw 53 and a second combination head screw 54 are respectively inserted into the first fuse busbar 51 and the second fuse busbar 52. The fuse holder includes a first fuse holder 55 installed on the first combination head screw 53 and a second fuse holder 56 installed on the second combination head screw 54. A fuse 50 is installed between the first fuse holder 55 and the second fuse holder 56.

[0029] Each current connection group 6 consists of a current busbar and a current shorting piece 60. The current busbar includes a first current busbar 61, a second current busbar 62, and a third current busbar 63 arranged in parallel in sequence. The current shorting piece 60 includes a first current shorting piece 60a and a second current shorting piece 60b. One end of the current shorting piece 60 forms a U-shaped part 601, and the other end is connected to an indicator 602. A waist-shaped hole 603 is formed in the middle part. A first pad is inserted into the first current busbar 61 and the third current busbar 63 respectively. The screw 64 and the second washer screw 65 are provided. The second current busbar 62 is provided with a third washer screw 66 and a fourth washer screw 67. The first current shorting piece 60a is connected to the third washer screw 66 through the oblong hole 603. The U-shaped part 601 of the first current shorting piece 60a is connected to the second washer screw 65. The second current shorting piece 60b is connected to the fourth washer screw 67 through the oblong hole 603. The U-shaped part 601 of the second current shorting piece 60b is not connected to the first washer screw 64.

[0030] Neutral connection group 4 includes a first neutral copper busbar 40 and a second neutral copper busbar 41, with four and two wiring screws 10 inserted respectively, for a total of six wiring screws 10. Each fuse connection group 5 includes a first fuse copper busbar 51 and a second fuse copper busbar 52. The configurations of the three fuse connection groups 5 are the same: the first fuse copper busbar 51 has five wiring screws 10 inserted, and the second fuse copper busbar 52 has one wiring screw 10 inserted, for a total of six wiring screws 10. The first fuse copper busbar of the other fuse connection group 5... A wiring screw 10 is inserted into each of the busbars 51 and 52, for a total of two wiring screws 10. Each current connection group 6 has four wiring screws 10 evenly distributed on the first current busbar 61, second current busbar 62, and third current busbar 63, for a total of twelve wiring screws 10. The base 1 has a mounting cavity 11 at one end corresponding to the anti-theft cover 2. The mounting cavity 11 contains combination head screws, washer screws, shorting screws, and wiring screws 10, which connect to the fuse busbar, current busbar, and neutral wire busbar at the bottom of the base 1. The mounting cavity 11 has a through slot 12 for extending the busbar, and a partition plate 13 is formed inside the mounting cavity 11 to separate four sets of fuse connection groups 5, three sets of current connection groups 6, and a neutral line connection group 4. The mounting cavity 11 also has a first sliding groove 14 and a second sliding groove 15 perpendicular to the current busbar for each current connection group 6. A first current shorting piece 60a and a second current shorting piece 60b are respectively disposed in the first sliding groove 14 and the second sliding groove 15. The anti-theft cover 2 has a first limiting block at one end of the mounting cavity 11 of the base 1 for each current connection group 6. The first limiting block 21 is located in the first sliding groove 14 and is adjacent to the indicator 602 on the first current shorting piece 60a. The second limiting block 22 is located in the second sliding groove 15 and maintains a certain distance from the edge of the waist-shaped hole 603 of the second current shorting piece 60b. Both ends of the anti-theft cover 2 are provided with lead-sealing screws 23 for fixing the base 1. The base 1 is provided with a fixing groove 16 corresponding to the lead-sealing screws 23. One side of the lead-sealing screws 23 is provided with a foolproof limiting post 24. The anti-theft cover 2 is made of transparent material.

[0031] Of course, in addition to the above embodiments, this utility model may have other various embodiments. Without departing from the essential technical solution of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, and these changes or modifications are equivalent to the technical solution in this patent. Therefore, these corresponding changes and modifications should all fall within the protection scope of the appended claims of this utility model, and the utility model creation is in line with the applicant's actual R&D capabilities and resource conditions.

Claims

1. A three-phase four-wire electrical energy metering jointing box, characterized in that: The device includes a base with a removable anti-theft cover. A base plate is sealed at the bottom of the base. Between the base and the base plate, there is a neutral wire connection group installed at the bottom of the base, as well as at least three current connection groups and at least four fuse connection groups. The neutral wire connection group is located at the top of one side of the bottom of the base. Fuse connection groups and current connection groups are alternately arranged at adjacent positions on one side of the neutral wire connection group and extend to the top of the other side of the base.

2. A three-phase four-wire electrical energy metering jointing box according to claim 1, characterized in that: Each fuse connection group includes a fuse busbar and a fuse holder. The fuse busbar includes a first fuse busbar and a second fuse busbar that are arranged opposite to each other. A first combination head screw and a second combination head screw are respectively inserted into the first fuse busbar and the second fuse busbar. The fuse holder includes a first fuse holder installed on the first combination head screw and a second fuse holder installed on the second combination head screw. A fuse is installed between the first fuse holder and the second fuse holder.

3. A three-phase four-wire electrical energy metering jointing box according to claim 1 or 2, characterized in that: Each current connection group includes a current busbar and a current shorting piece. One end of the current shorting piece forms a U-shape, and the other end is connected to an indicator. A waist-shaped hole is formed in the middle of the current shorting piece. The current busbar includes a first current busbar, a second current busbar, and a third current busbar arranged in parallel. The current shorting piece includes a first current shorting piece and a second current shorting piece. A first washer screw and a second washer screw are respectively inserted on the first and third current busbars. A third washer screw and a fourth washer screw are inserted on the second current busbar. The waist-shaped hole of the first current shorting piece is connected to the third washer screw of the second current busbar. The U-shape of the first current shorting piece is connected to the second washer screw of the third current busbar. The waist-shaped hole of the second current shorting piece is connected to the fourth washer screw of the second current busbar. The U-shape of the second current shorting piece is not connected to the first washer screw of the first current busbar.

4. The three-phase four-wire electrical energy metering jointing box according to claim 3, characterized in that: The neutral line connection assembly includes a neutral line copper busbar and a long connecting piece. One end of the long connecting piece forms a U-shaped portion, and the other end is connected to an indicator. A waist-shaped hole is formed in the middle of the long connecting piece. The neutral line copper busbar includes a first neutral line copper busbar and a second neutral line copper busbar arranged opposite to each other. A first shorting screw and a second shorting screw are respectively inserted on the first neutral line copper busbar and the second neutral line copper busbar. The waist-shaped hole of the long connecting piece is connected to the second shorting screw of the second neutral line copper busbar, and the U-shaped portion of the long connecting piece is connected to the first shorting screw of the first neutral line copper busbar.

5. The three-phase four-wire electrical energy metering jointing box according to claim 4, characterized in that: Each fuse connection group, current connection group, and neutral line connection group is also equipped with a wiring screw on its fuse busbar, current busbar, and neutral line busbar.

6. A three-phase four-wire electrical energy metering jointing box according to claim 5, characterized in that: The base has a mounting cavity at one end corresponding to the anti-theft cover. The mounting cavity is provided with a through groove for inserting combination head screws, washer screws, shorting screws, and wiring screws into the fuse copper busbar, current copper busbar, and neutral copper busbar at the bottom of the base.

7. The three-phase four-wire power metering junction box according to claim 6, characterized in that: The mounting cavity is formed with a partition plate that separates each group of fuse connection groups, each group of current connection groups, and the neutral line connection group. The mounting cavity is also provided with a first groove and a second groove perpendicular to the current copper busbar for each group of current connection groups. The first current shorting piece and the second current shorting piece are respectively disposed in the first groove and the second groove.

8. The three-phase four-wire power metering junction box according to claim 6 or 7, characterized in that: The anti-theft cover has a first limiting block and a second limiting block at one end of the base mounting cavity, corresponding to each group of current connection groups. The first limiting block is located in the first sliding groove and is close to the side of the indicator on the first current shorting piece. The second limiting block is located in the second sliding groove and maintains a certain distance from the edge of the waist-shaped hole of the second current shorting piece.

9. The three-phase four-wire power metering junction box according to claim 1, characterized in that: Both ends of the anti-theft cover are provided with lead-sealed screws for fixing the base. The base is provided with a fixing groove corresponding to the lead-sealed screw, and a foolproof limiting post is provided on one side of the lead-sealed screw.

10. The three-phase four-wire power metering junction box according to claim 1, characterized in that: The anti-theft cover is made of transparent material.

Images