Terminal structure and distributed DTU power distribution terminal

Abstract

The utility model discloses a terminal structure and a distributed DTU power distribution terminal, and relates to the technical field of power monitoring and control, and the terminal structure comprises a fixed plugging unit which comprises a fixed cylinder and a plugging assembly; the connecting and embedding unit comprises a connecting cylinder and an embedding cylinder; the intelligent power distribution unit comprises a terminal housing, a terminal board, a mainboard system, a power supply assembly, a signal lamp, a display and a button. The beneficial effects of the utility model are that the connection cylinder is matched with the embedding cylinder to realize tight clamping of a wire and ensure the connection stability of the wire, and the fixed plugging unit is matched with the connection cylinder to realize the connection strength of a wire joint and equipment and ensure the current transmission effect; through multi-interface information acquisition and cooperation with an LINUX system to develop and process data, the device has the functions of relay protection, safety, local feeder automation, intelligent distribution and the like, the network type local distribution function can be met through peer-to-peer communication between devices, and rapid fault point positioning, fault isolation and power supply recovery are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of power monitoring and control, in particular to a terminal structure and a distributed DTU power distribution terminal. Background Art

[0002] DTU power distribution terminal is a wireless terminal device specially used to convert serial port data into IP data or convert IP data into serial port data for transmission through wireless communication network. It is mainly responsible for data collection, transmission and processing, and is widely used in the monitoring and control of power systems. Based on its functional attributes, it is required to have the characteristics of convenient operation, rapid response and comprehensive functions.

[0003] The interface connected to the DTU power distribution terminal is called a terminal. Terminals mostly refer to wiring terminals, also called wiring terminals. Their main function is to transmit electrical signals or conduct electricity. Currently, the commonly used wiring terminals are a piece of metal sealed in insulating plastic, with holes at both ends for inserting wires and screws for tightening or loosening. However, this connection method also has some problems. For example, the terminal connection may be affected by corrosion, oxidation or loosening, resulting in poor current transmission or complete interruption. This may affect the performance or stability of the device.

[0004] Therefore, there is a need for a DTU distribution terminal that integrates relay protection, safety and automation, local feeder automation, and intelligent distributed functions, and can meet the functions of network-type local distribution through peer-to-peer communication between devices, and can quickly locate fault points, isolate faults, and restore power supply. In addition, a terminal structure is needed that can be used quickly and conveniently and can be stably connected.

[0005] In view of the above problems, a terminal structure and a distributed DTU power distribution terminal are proposed to solve the above problems. Utility Model Content

[0006] Some simplifications or omissions may be made in this section and the abstract of the specification and the title of the utility model of this application to avoid blurring the purpose of this section, the abstract of the specification and the title of the utility model, and such simplifications or omissions shall not be used to limit the scope of the utility model.

[0007] In view of the above-mentioned prior art problems, the present utility model is proposed.

[0008] The utility model aims to provide a terminal structure, and its purpose is to provide a terminal structure which can be used quickly and conveniently and can be stably connected.

[0009] In order to solve the above technical problems, the utility model provides the following technical solutions: a terminal structure, which includes a fixed plug-in unit, including a fixed cylinder and a plug-in assembly, wherein the plug-in assembly is arranged in the fixed cylinder;

[0010] The connecting and fitting unit comprises a connecting cylinder and a fitting cylinder, wherein the fitting cylinder is arranged in the connecting cylinder, and the connecting cylinder can be matched with the fixing cylinder and the plug-in assembly.

[0011] As a preferred solution of the terminal structure of the utility model, wherein: there is a container cavity inside the fixed cylinder, a through connecting hole is opened at the upper end thereof, two vertically through positioning grooves are symmetrically opened on the side of the connecting hole, and two clamping grooves are symmetrically opened at the lower end of the connecting hole, the positioning groove and the clamping groove are separated by ninety degrees along the circumferential direction of the connecting hole, and a partition ring is provided on the lower bottom plate of the container cavity, the outer diameter of the partition ring is one to two millimeters smaller than the connecting hole, and the height thereof is two millimeters lower than the lower end of the clamping groove.

[0012] As a preferred solution of the terminal structure of the utility model, wherein: the lower end of the positioning groove is a limiting inclined surface along the clockwise direction to one side of the locking groove, and its direction is to slide along the positioning groove toward the locking groove, the other side of the lower end of the positioning groove is a positioning baffle, and the other side of the locking groove is a locking baffle.

[0013] As a preferred solution of the terminal structure of the utility model, wherein: the plug-in assembly includes a wiring piece, a plug-in spring and a docking ring, the wiring piece is arranged on the inner side of the partition ring and fixed to the bottom plate of the fixed cylinder, and there are two of them distributed along the circumferential direction of the partition ring, the plug-in spring is arranged on the outer side of the partition ring, the lower end of which is fixed to the bottom plate of the fixed cylinder, and the upper end is connected to the docking ring.

[0014] As a preferred solution of the terminal structure of the utility model, wherein: the wiring piece is an arc-shaped structure, the lower end of which is a vertical section, the height of the vertical section is consistent with the height of the partition ring, the upper end of the vertical section is a matching section, the upper end of the matching section is an adjustment section, the upper end of the adjustment section is a clamping section, the upper end of the clamping section is an extrusion section, and the height of the extrusion section reaches the upper end of the fixed cylinder.

[0015] As a preferred solution of the terminal structure of the utility model, wherein: the upper end of the inner wall of the connecting cylinder is a threaded cylinder, the lower end of the threaded cylinder is a reducing cylinder, and there is also a positioning clamping block on the outer side of the lower end of the connecting cylinder, and there are two positioning clamping blocks symmetrically distributed along the circumference of the connecting cylinder, which cooperate with the positioning groove, and there is an extrusion block on the inner side of the lower end of the connecting cylinder at a position relative to the positioning clamping block, and there is a docking groove at the bottom of the connecting cylinder, and the docking groove cooperates with the docking ring.

[0016] As a preferred solution of the terminal structure of the utility model, the upper end of the embedded cylinder is a rotating block, the lower end of the rotating block is a screw cylinder, which cooperates with the threaded cylinder, and the lower end of the screw cylinder is a clamping joint, which is evenly distributed along the circumferential surface of the embedded cylinder. The outer side wall can cooperate with the reducer, and the inner wall is vertically spaced with triangular wedges.

[0017] The beneficial effects of the terminal structure of the utility model are: by cooperating with the connecting tube and the engaging tube, the wire is tightly clamped to ensure the connection stability of the wire, and by cooperating with the fixed plug-in unit and the connecting tube, the connection strength between the wire connector and the equipment is achieved to ensure the current transmission effect.

[0018] Another object of the utility model is to provide a distributed DTU power distribution terminal, which aims to provide a DTU power distribution terminal that integrates relay protection, safety and automation, local feeder automation, and intelligent distributed functions, and can meet the functions of network-type local distribution through peer-to-peer communication between devices, so as to quickly locate fault points, isolate faults, and restore power supply.

[0019] In order to solve the above technical problems, the utility model also provides the following technical solutions: a distributed DTU power distribution terminal, which includes a terminal structure; and an intelligent power distribution unit, including a terminal shell, a terminal board, a mainboard system, a power supply component, a signal light, a display and a button, the terminal board is arranged on the rear side of the terminal shell, and a plurality of the fixed plug-in units are arranged on it, the mainboard system is arranged on the inner side of the terminal shell, the power supply component connects the terminal board and the mainboard system, and the signal light, the display and the button are arranged at the front end of the terminal shell.

[0020] As a preferred solution of the distributed DTU power distribution terminal of the utility model, wherein: the power supply component provides three working power supply interfaces to choose from, namely 85-265VAC / DC power supply interface, 24VDC power supply interface and 48VDC power supply interface, and the 85-265VAC / DC power supply interface, the 24VDC power supply interface and the 48VDC power supply interface are arranged on the terminal board.

[0021] The beneficial effects of the distributed DTU power distribution terminal of the utility model are as follows: information is collected through multiple interfaces, an A8 processor is used, and data is processed in cooperation with the LINUX system development, so that the device has the functions of relay protection, safety and automation, local feeder automation, intelligent distribution, etc., and through peer-to-peer communication between devices, it can meet the functions of network-based local distribution, and realize rapid positioning of fault points, isolation of faults, and restoration of power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0023] Figure 1 This is a schematic diagram of the distributed DTU power distribution terminal panel in the utility model.

[0024] Figure 2 This is a diagram of the distributed DTU power distribution terminal terminal board in the utility model.

[0025] Figure 3 It is an overall schematic diagram of the terminal structure in the utility model.

[0026] Figure 4 It is an exploded schematic diagram of the terminal structure in the utility model.

[0027] Figure 5 It is a cross-sectional schematic diagram of the fixing cylinder in the utility model.

[0028] Figure 6 It is a schematic diagram of the wiring piece in the utility model.

[0029] Figure 7 It is a cross-sectional schematic diagram of the connecting tube in the utility model.

[0030] Figure 8 It is a cross-sectional schematic diagram of the embedded cylinder in the utility model. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0034] Example 1

[0035] Reference Figure 3 to Figure 8 , which is the first embodiment of the utility model, and provides a terminal structure, including a fixed plug-in unit 100, including a fixed cylinder 101 and a plug-in assembly 102, wherein the plug-in assembly 102 is arranged in the fixed cylinder 101;

[0036] The connecting and fitting unit 200 includes a connecting cylinder 201 and a fitting cylinder 202 . The fitting cylinder 202 is disposed in the connecting cylinder 201 . The connecting cylinder 201 can be matched with the fixing cylinder 101 and the plug-in assembly 102 .

[0037] Furthermore, there is a container cavity 101a inside the fixed cylinder 101, and a through connecting hole 101b is opened at the upper end thereof, and two positioning grooves 101c that penetrate up and down are symmetrically opened on the side of the connecting hole 101b, and two engaging grooves 101d are symmetrically opened at the lower end of the connecting hole 101b. The positioning groove 101c and the engaging groove 101d are separated by ninety degrees along the circumferential direction of the connecting hole 101b. A partition ring 101e is provided on the lower bottom plate of the container cavity 101a. The outer diameter of the partition ring 101e is one to two millimeters smaller than the connecting hole 101b, and its height is two millimeters lower than the lower end of the engaging groove 101d.

[0038] Furthermore, the upper end of the inner wall of the connecting tube 201 is a threaded tube 201a, and the lower end of the threaded tube 201a is a reducing tube 201b. There is also a positioning snap-fit ​​block 201c on the outer side of the lower end of the connecting tube 201. There are two positioning snap-fit ​​blocks 201c symmetrically distributed along the circumference of the connecting tube 201, which cooperate with the positioning groove 101c. There is an extrusion block 201d on the inner side of the lower end of the connecting tube 201 at a position opposite to the positioning snap-fit ​​block 201c. There is a docking groove 201e at the bottom of the connecting tube 201, and the docking groove 201e cooperates with the docking ring 102c.

[0039] Furthermore, the upper end of the interlocking cylinder 202 is a rotating block 202a, and the lower end of the rotating block 202a is a screw cylinder 202b, which cooperates with the threaded cylinder 201a. The lower end of the screw cylinder 202b is a clamping joint 202c, which is evenly distributed along the circumferential surface of the interlocking cylinder 202, and its outer wall can cooperate with the reducing cylinder 201b, and its inner wall is vertically spaced with triangular wedges 202d.

[0040] When in use, insert the wire into the fitting tube 202 so that the wire joint extends out of the lower end of the connecting tube 201 by one to two millimeters to meet the connection requirements. Then, the connecting tube 201 and the fitting tube 202 are rotated relative to each other. At this time, the clamping joint 202c rises relative to the reducing tube 201b. Under the squeezing of the reducing tube 201b, the inner diameter of the clamping joint 202c is reduced, further increasing the squeezing force of the triangular wedge 202d on the wire until the wire connection is firm, thus completing the fixation of the wire.

[0041] In summary, this design uses the triangular wedge to squeeze and fix the wire, and cooperates with the clamping joint and the reducer to increase the force of the triangular wedge on the wire, ensuring the stability of the wire connection. At the same time, the wire can be loosened by twisting the threaded barrel, which can be easily recycled.

[0042] Example 2

[0043] Reference Figure 3 to Figure 7, which is the second embodiment of the utility model, comprises a fixed plug-in unit 100, comprising a fixed cylinder 101 and a plug-in assembly 102, wherein the plug-in assembly 102 is disposed in the fixed cylinder 101;

[0044] The connecting and fitting unit 200 includes a connecting cylinder 201 and a fitting cylinder 202 . The fitting cylinder 202 is disposed in the connecting cylinder 201 . The connecting cylinder 201 can be matched with the fixing cylinder 101 and the plug-in assembly 102 .

[0045] Furthermore, there is a container cavity 101a inside the fixed cylinder 101, and a through connecting hole 101b is opened at the upper end thereof, and two positioning grooves 101c that penetrate up and down are symmetrically opened on the side of the connecting hole 101b, and two engaging grooves 101d are symmetrically opened at the lower end of the connecting hole 101b. The positioning groove 101c and the engaging groove 101d are separated by ninety degrees along the circumferential direction of the connecting hole 101b. A partition ring 101e is provided on the lower bottom plate of the container cavity 101a. The outer diameter of the partition ring 101e is one to two millimeters smaller than the connecting hole 101b, and its height is two millimeters lower than the lower end of the engaging groove 101d.

[0046] Furthermore, the lower end of the positioning groove 101c is a limiting inclined surface 101f along the clockwise direction to the engaging groove 101d, and its direction is to slide along the positioning groove 101c to the engaging groove 101d. The other side of the lower end of the positioning groove 101c is a positioning baffle 101g, and the other side of the engaging groove 101d is a engaging baffle 101h.

[0047] Furthermore, the plug-in assembly 102 includes a wiring piece 102a, a plug-in spring 102b and a docking ring 102c. The wiring piece 102a is arranged on the inner side of the partition ring 101e and fixed to the bottom plate of the fixed cylinder 101. There are two wiring pieces distributed along the circumferential direction of the partition ring 101e. The plug-in spring 102b is arranged on the outer side of the partition ring 101e. The lower end of the wiring piece 102a is fixed to the bottom plate of the fixed cylinder 101 and the upper end is connected to the docking ring 102c.

[0048] Furthermore, the terminal piece 102a is an arc-shaped structure, and its lower end is a vertical section 102a-1, the height of the vertical section 102a-1 is consistent with the height of the partition ring 101e, the upper end of the vertical section 102a-1 is a matching section 102a-2, the upper end of the matching section 102a-2 is an adjustment section 102a-3, the upper end of the adjustment section 102a-3 is a snap-fit ​​section 102a-4, the upper end of the snap-fit ​​section 102a-4 is an extrusion section 102a-5, and the height of the extrusion section 102a-5 reaches the upper end of the fixed tube 101.

[0049] Furthermore, the upper end of the inner wall of the connecting tube 201 is a threaded tube 201a, and the lower end of the threaded tube 201a is a reducing tube 201b. There is also a positioning snap-fit ​​block 201c on the outer side of the lower end of the connecting tube 201. There are two positioning snap-fit ​​blocks 201c symmetrically distributed along the circumference of the connecting tube 201, which cooperate with the positioning groove 101c. There is an extrusion block 201d on the inner side of the lower end of the connecting tube 201 at a position opposite to the positioning snap-fit ​​block 201c. There is a docking groove 201e at the bottom of the connecting tube 201, and the docking groove 201e cooperates with the docking ring 102c.

[0050] When in use, the positioning snap-fit ​​block 201c of the connecting tube 201 is matched with the positioning groove 101c of the fixed tube 101, and the connecting tube 201 is pressed into the connecting hole 101b. During the entry process, the docking groove 201e first cooperates with the docking ring 102c and squeezes the plug spring 102b. Continue to press. When the connecting tube 201 touches the top of the partition ring 101e, rotate the connecting tube 201 clockwise to make it slide into the snap-fit ​​groove 101d, and the connection process is completed. During this process, the wire connector will enter the inner side of the wiring piece 102a. When the connecting tube 201 is rotated clockwise, the squeezing block 201d will first contact the matching section 102a-2. In the process of rising into the snap-fit ​​groove 101d under the action of the elastic force of the plug spring 102b, the squeezing block 201d squeezes the adjustment section 102a-3, so that the wiring piece is in close contact with the wire connector.

[0051] In summary, this design achieves the connection between the wire connector and the equipment by fixing the plug-in unit and the connecting tube, and squeezes the wiring piece by the squeezing block to make the wiring piece and the wire connector in close contact, thereby ensuring the current transmission effect.

[0052] Example 3

[0053] Reference Figure 1-2 , which is the third embodiment of the utility model. Based on the above embodiment, this embodiment further provides a distributed DTU power distribution terminal. It includes an intelligent power distribution unit 300, including a terminal housing 301, a terminal board 302, a mainboard system 303, a power supply component 304, a signal light 305, a display 306 and a button 307. The terminal board 302 is arranged at the rear side of the terminal housing 301, and a plurality of fixed plug-in units 100 are arranged thereon. The mainboard system 303 is arranged inside the terminal housing 301. The power supply component 304 connects the terminal board 302 and the mainboard system 303. The signal light 305, the display 306 and the button 307 are arranged at the front end of the terminal housing 301.

[0054] Preferably, the mainboard system 303 provides independent multi-network channels and protocol support, and provides multiple communication interfaces such as RS-232, RS-485, electrical / optical Ethernet, and communication protocols such as IEC60870-5-101 / 104 and IEC61850-GOOSE.

[0055] Furthermore, the power supply component 304 includes three working power supply interfaces, namely 85-265VAC / DC power supply interface 304a, 24VDC power supply interface 304b and 48VDC power supply interface 304c, and the 85-265VAC / DC power supply interface 304a, the 24VDC power supply interface 304b and the 48VDC power supply interface 304c are arranged on the terminal board 302.

[0056] It should be noted that the power input end adopts multiple anti-interference filtering measures and lightning protection circuits. Various filter capacitors use long-life, high-temperature resistant, high-frequency low-resistance electrolytic capacitors, and the high-frequency transformer adopts double-layer shielding measures.

[0057] Preferably, the device can collect 19 / 27 telemetering quantities. For example, the switch closed, open, no energy storage, remote position and other telemetering information:

[0058]

[0059] Preferably, the device can collect analog quantities: Ua, Ub, Uc, U0, Ia, Ib, Ic, IA, IB, IC, I0, frequency, and calculate P, Q, power factor; the power can be calculated using the three-meter method or the two-meter method:

[0060] Analog terminals Analog quantity name Detection Methods Terminal D01, D02 Phase A current (Ia) Add 1 times the rated value, the displayed deviation shall not exceed 0.5% Terminal D03, D04 Phase B current (Ib) Add 1 times the rated value, the displayed deviation shall not exceed 0.5% Terminals D05, D06 Phase C current (Ic) Add 1 times the rated value, the displayed deviation shall not exceed 0.5% Terminal D07, D08 Zero sequence current (I0) Add 1 times the rated value, the displayed deviation shall not exceed 0.5% Terminal D09, D10 Phase A current (IA) Add 1 times the rated value, the displayed deviation shall not exceed 0.5% Terminal D11, D12 Phase B current (IB) Add 1 times the rated value, the displayed deviation shall not exceed 0.5% Terminal D13, D14 Phase C current (IC) Add 1 times the rated value, the displayed deviation shall not exceed 0.5% Terminal D15, D16 DC(Uz2) Add 50V, the display deviation does not exceed 0.5% Terminal C01, C04 Voltage (Ua1) Add 100V, the display deviation does not exceed 0.5% Terminal C02, C04 Voltage (Ub1) Add 100V, the display deviation does not exceed 0.5% Terminal C03, C04 Voltage (Uc1) Add 100V, the display deviation does not exceed 0.5% Terminal C05, C06 Zero sequence voltage (U0) Add 100V, the display deviation does not exceed 0.5% Terminals C07, C08 Voltage (Uab2) Add 100V, the display deviation does not exceed 0.5% Terminals C08, C09 Voltage (Ubc2) Add 100V, the display deviation does not exceed 0.5% Terminal C09, C07 Voltage (Uca2) Add 100V, the display deviation does not exceed 0.5% Terminals C11, C12 DC(Uz1) Add 50V, the display deviation does not exceed 0.5%

[0061] It should be noted that the device panel is equipped with 16 / 20 signal lights, a large-screen LCD display and 9 buttons. Users can complete functions such as set value adjustment, clock setting, report display query, etc. by viewing the contents of the LCD display and operating the keyboard; the device provides 20 signal lights, namely "power supply", "operation", "communication", "remote", "contact", "reclosing charging", "conventional protection", "voltage type", "intelligent distributed", "centralized", "alarm", "action", "line fault", "locking closing", "self-test abnormality", "reclosing action", "switch closed", "switch open", "grounding closed", "grounding open".

[0062] In summary, the device collects information through multiple interfaces, adopts A8 processor, and cooperates with LINUX system to develop and process data, so that the device has functions such as relay protection, safety and automation, local feeder automation, and intelligent distribution. It can also meet the functions of network-based local distribution through peer-to-peer communication between devices, and realize rapid positioning of fault points, isolation of faults, and restoration of power supply.

[0063] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and ratio of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present utility model. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also an equivalent structure. Without departing from the scope of the present invention, other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the present invention is not limited to a specific embodiment, but extends to various modifications that still fall within the scope of the appended claims.

[0064] Additionally, in order to provide a concise description of example embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0065] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0066] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A terminal structure, characterized in that: include, A fixed plug-in unit (100) comprises a fixed cylinder (101) and a plug-in assembly (102), wherein the plug-in assembly (102) is arranged in the fixed cylinder (101); The connecting and fitting unit (200) comprises a connecting cylinder (201) and a fitting cylinder (202), wherein the fitting cylinder (202) is arranged in the connecting cylinder (201), and the connecting cylinder (201) can cooperate with the fixing cylinder (101) and the plug-in assembly (102).

2. The terminal structure according to claim 1, characterized in that: The fixing cylinder (101) has a container cavity (101a) inside, and a through connection hole (101b) is provided at the upper end thereof, and two vertically through positioning grooves (101c) are symmetrically provided on the side of the connection hole (101b), and two engaging grooves (101d) are symmetrically provided at the lower end of the connection hole (101b), and the positioning groove (101c) and the engaging groove (101d) are spaced ninety degrees apart along the circumferential direction of the connection hole (101b), and a partition ring (101e) is provided on the lower bottom plate of the container cavity (101a), and the outer diameter of the partition ring (101e) is one to two millimeters smaller than that of the connection hole (101b), and the height thereof is two millimeters lower than the lower end of the engaging groove (101d).

3. The terminal structure according to claim 2, characterized in that: The lower end of the positioning groove (101c) is provided with a limiting inclined surface (101f) along a clockwise direction to one side of the engaging groove (101d), and its direction is to slide along the positioning groove (101c) toward the engaging groove (101d), the other side of the lower end of the positioning groove (101c) is a positioning baffle (101g), and the other side of the engaging groove (101d) is a engaging baffle (101h).

4. The terminal structure according to claim 3, characterized in that: The plug-in assembly (102) comprises a wiring piece (102a), a plug-in spring (102b) and a docking ring (102c); the wiring piece (102a) is arranged on the inner side of the partition ring (101e) and fixed on the bottom plate of the fixed cylinder (101), and two of the wiring piece (102a) are distributed along the circumferential direction of the partition ring (101e); the plug-in spring (102b) is arranged on the outer side of the partition ring (101e), and the lower end of the plug-in spring is fixed on the bottom plate of the fixed cylinder (101), and the upper end is connected to the docking ring (102c).

5. The terminal structure according to claim 4, characterized in that: The wiring piece (102a) is an arc-shaped structure, the lower end of which is a vertical section (102a-1), the height of the vertical section (102a-1) is consistent with the height of the partition ring (101e), the upper end of the vertical section (102a-1) is a matching section (102a-2), the upper end of the matching section (102a-2) is an adjustment section (102a-3), the upper end of the adjustment section (102a-3) is a snap-fit ​​section (102a-4), the upper end of the snap-fit ​​section (102a-4) is an extrusion section (102a-5), and the height of the extrusion section (102a-5) reaches the upper end of the fixed tube (101).

6. The terminal structure according to claim 4 or 5, characterized in that: The upper end of the inner wall of the connecting tube (201) is a threaded tube (201a), the lower end of the threaded tube (201a) is a reducing tube (201b), and the outer side of the lower end of the connecting tube (201) is also provided with a positioning snap-fit ​​block (201c), two of the positioning snap-fit ​​blocks (201c) are symmetrically distributed along the circumference of the connecting tube (201), and cooperate with the positioning groove (101c).

7. The terminal structure according to claim 6, characterized in that: The inner side of the lower end of the connecting tube (201) is provided with an extrusion block (201d) at a position opposite to the positioning locking block (201c), and the bottom of the connecting tube (201) is provided with a docking groove (201e), and the docking groove (201e) cooperates with the docking ring (102c).

8. The terminal structure according to claim 7, characterized in that: The upper end of the interlocking cylinder (202) is a rotating block (202a), and the lower end of the rotating block (202a) is a screw cylinder (202b), which cooperates with the threaded cylinder (201a). The lower end of the screw cylinder (202b) is a clamping joint (202c), which is evenly distributed along the circumference of the interlocking cylinder (202), and its outer wall can cooperate with the reducing cylinder (201b), and its inner wall is vertically spaced with triangular wedges (202d).

9. A distributed DTU power distribution terminal, characterized in that: It comprises a terminal structure as described in any one of claims 1 to 8; and an intelligent distribution unit (300), comprising a terminal housing (301), a terminal board (302), a mainboard system (303), a power supply component (304), a signal light (305), a display (306) and a button (307), wherein the terminal board (302) is arranged at the rear side of the terminal housing (301), and a plurality of fixed plug-in units (100) are arranged thereon, the mainboard system (303) is arranged at the inner side of the terminal housing (301), the power supply component (304) connects the terminal board (302) and the mainboard system (303), and the signal light (305), the display (306) and the button (307) are arranged at the front end of the terminal housing (301).

10. The distributed DTU power distribution terminal according to claim 9, characterized in that: The power supply component (304) includes three working power supply interfaces, namely, an 85-265VAC / DC power supply interface (304a), a 24VDC power supply interface (304b) and a 48VDC power supply interface (304c); the 85-265VAC / DC power supply interface (304a), the 24VDC power supply interface (304b) and the 48VDC power supply interface (304c) are arranged on the terminal board (302).

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