A new type of ground contact built-in ground knife high-explosive device

Abstract

The utility model discloses a novel ground contact built -in ground knife high -blasting device, including main cavity, the bus cavity is provided with the main cavity rear side, the inner chamber rear lower portion of main cavity is provided with the sunken chamber, and the ground knife subassembly is installed in the sunken chamber bottom, the main cavity is separated with the bus cavity through the step type baffle, and the lower half segment of step type baffle is embedded with ground knife outgoing contact, the upper half segment fixed embedding of step type baffle has main bus contact, and the circuit breaker handcart is movably installed in the main cavity, when the circuit breaker handcart advances to the working position, the moving contact of circuit breaker handcart rear end and main bus contact close engagement and realize main loop conduction, simultaneously, the ground contact of circuit breaker handcart and ground knife outgoing contact form electrical connection. The utility model passes through the optimization structure layout, has reduced the equipment volume and weight significantly, has solved the existing equipment volume big, the maintenance difficult etc.

Description

Technical Field

[0001] This utility model relates to a mine explosion-proof and intrinsically safe high-voltage vacuum power distribution device, specifically a novel high-explosive device with a grounding contact built into the grounding switch. Background Technology

[0002] In power supply systems operating in explosive environments such as underground coal mines, explosion-proof and intrinsically safe high-voltage vacuum power distribution devices (hereinafter referred to as "high-explosive" or "high-explosive switches") are crucial core equipment. They are responsible for the distribution, control, and protection of electrical energy, and their performance directly affects the reliability of underground power supply and the safety of workers. Various high-explosive devices equipped with grounding switches are available on the market. Depending on the installation location of the grounding switch, they can be mainly divided into rear-mounted grounding switches, bottom-mounted grounding switches, and built-in grounding switches. Among these, the built-in grounding switch structure, because it integrates the grounding function inside the main cavity of the equipment, exhibits certain advantages in terms of overall integrity and protection compared to the external structure, and is considered a relatively optimized solution.

[0003] However, even existing high-explosive devices with built-in ground blades still have several significant shortcomings that urgently need to be addressed, mainly in the following aspects:

[0004] 1. Large equipment size and low space utilization: Traditional designs often require increasing the size of the main chamber to accommodate the grounding switch and its operating mechanism, resulting in a bulky and large-area high-explosive switch cabinet. This significantly increases the difficulty and cost of transportation, installation, and layout in the confined and compact underground tunnels.

[0005] 2. Maintenance and repair are extremely troublesome: Once the grounding switch contacts or operating mechanism malfunction, the complex interlocking structure and compact yet unreasonable internal layout make maintenance and replacement work exceptionally difficult. Maintenance personnel often need to disassemble a large number of unrelated parts to access the fault point, resulting in lengthy maintenance time, low work efficiency, and seriously affecting the restoration speed of the underground power supply system. Utility Model Content

[0006] In view of the shortcomings of the existing technology, this utility model provides a new type of high-explosive device with a grounding contact built-in grounding knife, which overcomes the shortcomings of the existing technology. By optimizing the structural layout, the size and weight of the equipment are significantly reduced; and the problems of large size and difficult maintenance of existing equipment are solved.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A novel grounding contact with built-in grounding switch high-explosive device includes a main cavity, a busbar cavity is provided on the rear side of the main cavity, a recessed cavity is provided below the rear side of the inner cavity of the main cavity, and a grounding switch assembly is installed at the bottom of the recessed cavity;

[0009] The main cavity and the busbar cavity are separated by a stepped partition. The lower half of the stepped partition is fixedly fitted with a grounding knife outlet contact. When the grounding knife switch of the grounding knife assembly contacts the contact end of the grounding knife outlet contact, the grounding blade of the grounding knife assembly is in a vertical state.

[0010] The upper half of the stepped partition is fixedly embedded with the main busbar contact, and the circuit breaker trolley is movably installed in the main cavity. When the circuit breaker trolley is pushed to the working position, the moving contact at the rear end of the circuit breaker trolley is tightly engaged with the main busbar contact to realize the main circuit conduction. At the same time, the grounding contact of the circuit breaker trolley forms an electrical connection with the grounding switch outlet contact.

[0011] Preferably, the busbar cavity includes an upper busbar cavity and a lower busbar cavity, which are separated by an insulating partition. The lower busbar cavity is located in the lower half of the stepped partition, and the bottom of the lower busbar cavity is provided with an inlet / outlet cable inlet for connecting external cables. After the external cable passes through the inlet / outlet cable inlet into the lower busbar cavity, it is connected to the terminal of the grounding switch outlet contact.

[0012] The upper busbar cavity is fixedly installed with a main busbar copper busbar, which is connected to the wiring terminals of the main busbar contacts.

[0013] Preferably, connecting flanges are provided on both the left and right sides of the upper busbar chamber, and a left wiring chamber and a right wiring chamber are fixedly connected to the left and right sides of the upper busbar chamber through the connecting flanges. The two ends of the main busbar copper busbar extend into the left wiring chamber and the right wiring chamber respectively, and the main busbar copper busbar is electrically isolated from the left and right side walls of the upper busbar chamber through insulating connecting sleeves. Cable outlet interfaces are fixedly installed below the left wiring chamber and the right wiring chamber.

[0014] Preferably, a remote control wiring cavity is provided above the main cavity, and a control circuit terminal block is provided inside the remote control wiring cavity; the remote control wiring cavity is connected to the secondary plug of the circuit breaker truck through a wire.

[0015] Preferably, the grounding switch outgoing contact includes an outgoing contact body. One end of the outgoing contact body is provided with a terminal for connecting an external cable, and the other end of the outgoing contact body is provided with a perforated contact for mating with the grounding contact of the circuit breaker trolley. A grounding conductive plate is fixedly installed on the lower surface of the outgoing contact body. The grounding conductive plate is connected to a conductive rod inside the outgoing contact body, and the lower end of the grounding conductive plate is mated with the grounding blade of the grounding switch assembly.

[0016] Preferably, a support base is fixedly installed below the main cavity.

[0017] This utility model provides a novel high-explosive device for grounding contacts with built-in grounding switches, offering the following advantages: By employing a recessed cavity design on the rear side of the main cavity, the grounding switch assembly can be cleverly integrated into the lower rear part of the main cavity. Furthermore, the layered layout design using stepped partitions allows the main busbar contacts and grounding switch outlet contacts to be staggered vertically, further reducing the depth and height of the main cavity. This results in a more compact overall structure, saving internal cabinet space and improving installation flexibility. Simultaneously, the stepped partitions provide a longer surface creepage distance and a better air insulation path for the main busbar contacts and grounding switch outlet contacts, effectively avoiding the risk of accidental creepage or short circuits between high- and low-voltage live parts. This enhances the long-term operational reliability and service life of the equipment in harsh environments. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this utility model or the prior art, the accompanying drawings used in the description of this utility model or the prior art will be briefly introduced below.

[0019] Figure 1 A schematic diagram of the structure of this utility model;

[0020] Figure 2 A cross-sectional structural diagram of this utility model;

[0021] Figure 3 A schematic diagram of the stepped partition in this utility model;

[0022] Explanation of the labels in the diagram:

[0023] 1. Main cavity; 2. Busbar cavity; 3. Recessed cavity; 4. Grounding switch assembly; 5. Stepped partition; 6. Grounding switch outgoing contact; 7. Main busbar contact; 8. Circuit breaker trolley; 9. Main busbar copper busbar; 10. Left wiring compartment; 11. Right wiring compartment; 12. Remote control wiring compartment; 13. Support base; 201. Upper busbar cavity; 202. Lower busbar cavity; 203. Insulating partition; 204. Incoming and outgoing cable entry interface. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0025] Example 1, as Figure 1-3 As shown, a novel grounding contact with built-in grounding knife high-explosive device includes a main cavity 1, a busbar cavity 2 is provided on the rear side of the main cavity 1, a recessed cavity 3 is provided on the lower rear side of the inner cavity of the main cavity 1, and a grounding knife assembly 4 is installed at the bottom of the recessed cavity 3.

[0026] The main cavity 1 and the busbar cavity 2 are separated by a stepped partition 5. The lower half of the stepped partition 5 is fixedly embedded with a grounding knife outlet contact 6. When the grounding knife switch of the grounding knife assembly 4 contacts the contact end of the grounding knife outlet contact 6, the grounding blade of the grounding knife assembly 4 is in a vertical state.

[0027] The upper half of the stepped partition 5 is fixedly fitted with the main busbar contact 7, and the circuit breaker trolley 8 is movably installed in the main cavity 1. When the circuit breaker trolley 8 is pushed to the working position, the moving contact at the rear end of the circuit breaker trolley 8 is tightly engaged with the main busbar contact 7 and the main circuit is connected. At the same time, the grounding contact of the circuit breaker trolley 8 is electrically connected with the grounding switch outlet contact 6.

[0028] Working principle:

[0029] Under normal power supply conditions, the circuit breaker trolley 8 is in the working position. At this time, the moving contact of the circuit breaker trolley 8 reliably engages with the main busbar contact 7 installed on the stepped partition 5, forming the main circuit path. In this state, the grounding switch of the grounding switch assembly 4 is in the open position, separated from the contact end of the grounding switch output contact 6 in the lower half of the stepped partition 5, ensuring that the main circuit power supply is not incorrectly grounded.

[0030] When maintenance of the line or equipment is required, the circuit breaker trolley 8 is first moved from the working position to the test or maintenance position via electric or manual operation. At this time, the moving contact of the circuit breaker trolley 8 separates from the main busbar contact 7, and the main circuit is disconnected. Then, the grounding switch assembly 4 is closed, so that the grounding switch of the grounding switch assembly 4 contacts the grounding switch outgoing contact 6. This process can effectively release residual charge and induced current on the line, providing safe conditions for subsequent opening of the door cover for maintenance.

[0031] This invention utilizes a recessed cavity 3 on the rear side of the main cavity 1, cleverly integrating the grounding switch assembly 4 into the lower rear part of the main cavity 1, breaking away from the traditional layout where the grounding switch and main circuit contacts are arranged side-by-side. Furthermore, the layered layout design using stepped partitions 5 allows the main busbar contacts 7 and the grounding switch output contacts 6 to be staggered vertically, further reducing the depth (front-to-back direction) and height of the main cavity. This results in a more compact overall structure, saving internal cabinet space and improving installation flexibility. Simultaneously, the stepped partitions 5 provide a longer surface creepage distance and a better air insulation path for the main busbar contacts 7 (high potential) and the grounding switch output contacts 6 (zero potential during maintenance). This effectively avoids the risk of accidental creepage or short circuits between high- and low-voltage live parts, thereby improving the long-term operational reliability and service life of the equipment in harsh environments.

[0032] Furthermore, by staggering the stepped partition 5 in the vertical direction, the grounding blade of the grounding knife assembly 4 can be in a vertical state when the grounding knife switch of the grounding knife assembly 4 comes into contact with the contact end of the grounding knife outlet contact 6; thus, the operating trajectory and final state of the grounding knife assembly 4 are very clear and stable.

[0033] In Example 2, as a further preferred embodiment of Example 1, the busbar cavity 2 includes an upper busbar cavity 201 and a lower busbar cavity 202, which are separated by an insulating partition 203. The lower busbar cavity 202 is located in the lower half of the stepped partition 5. The bottom of the lower busbar cavity 202 is provided with an inlet / outlet cable inlet interface 204 for connecting external cables. After the external cable passes through the inlet / outlet cable inlet interface 204 and enters the lower busbar cavity 202, it is connected to the terminal of the grounding switch outlet contact 6. A main busbar copper busbar 9 is fixedly installed in the upper busbar cavity 201, and the main busbar copper busbar 9 is connected to the terminal of the main busbar contact 7.

[0034] The busbar cavity 2 is divided into an independent upper busbar cavity 201 and a lower busbar cavity 202 by an insulating partition 203, thereby achieving longitudinal isolation between the "high-potential area" and the "operation interface area". Therefore, when performing operations such as cable wiring, maintenance or replacement, it is only necessary to open the relevant maintenance port of the lower busbar cavity 202 without touching the live main busbar copper busbar 9 in the upper busbar cavity 201, and it will not affect the main busbar connection in the upper busbar cavity 201 at all, fundamentally eliminating the major safety risk of electric shock during operation and maintenance.

[0035] In Example 3, as a further preferred embodiment of Example 1, connecting flanges are provided on both the left and right sides of the upper busbar chamber 201. The left and right sides of the upper busbar chamber 201 are fixedly connected to the left wiring compartment 10 and the right wiring compartment 11 via these connecting flanges. The two ends of the main busbar copper busbar 9 extend into the left wiring compartment 10 and the right wiring compartment 11 respectively, and the main busbar copper busbar 9 is electrically isolated from the left and right side walls of the upper busbar chamber 201 via insulating connecting sleeves. Cable outlet interfaces are fixedly installed below the left wiring compartment 10 and the right wiring compartment 11. By providing connecting flanges on both the left and right sides of the upper busbar chamber 201, and matching them with the left wiring compartment 10 and the right wiring compartment 11, when the equipment is used as a single power distribution unit, the left wiring compartment 10 and the right wiring compartment 11 can be used to connect incoming and outgoing cables. The cable outlet interfaces installed below the left wiring compartment 10 and the right wiring compartment 11 further simplify cable connection and wiring work, making the installation and maintenance of the entire power supply system more efficient and safer. When multiple devices need to operate in parallel (connected), the left wiring compartment 10 and the right wiring compartment 11 can be directly removed from the connecting flange, and then the upper busbar chambers 201 of the two devices can be rigidly connected directly through the connecting flange, so that the main busbar copper busbars are connected to form a unified busbar system. This structural design not only realizes the flexible switching between independent operation of a single device and parallel operation of multiple devices, but also eliminates the expensive and bulky inter-cabinet connection busbar bridge required for multi-cabinet parallel connection in traditional solutions, greatly saving the overall space, material costs and installation time for parallel installation, and achieving compact equipment layout and efficient engineering installation.

[0036] Furthermore, the insulating connecting sleeve ensures reliable insulation between the main busbar copper busbar 9 and the side wall of the upper busbar chamber 201, effectively preventing surface discharge and electrical breakdown, and ensuring long-term safe and stable operation of the equipment under high voltage and high current conditions. By placing the cable outlet interfaces below the left wiring chamber 10 and the right wiring chamber 11, the introduction and exit of external cables are concentrated at the lower part of both sides of the equipment, making on-site wiring more organized and avoiding cable tangling inside the cabinet, which is both aesthetically pleasing and safe.

[0037] In Example 4, as a further preferred embodiment of Example 1, a remote control wiring cavity is provided above the main cavity 1. The remote control wiring cavity 12 contains a control circuit terminal block. The remote control wiring cavity is connected to the secondary plug of the circuit breaker trolley 8 via a wire. By encapsulating all the low-voltage, low-current secondary control circuits used to connect external control signals (such as PLCs, integrated protectors, remote buttons, etc.) within a separate remote control wiring cavity 12, physically isolated from the main cavity, electromagnetic interference from the high-voltage main circuit to the control signals can be effectively avoided, greatly improving the anti-interference capability and reliability of the control system. Furthermore, the control circuit terminal block is protected within an independent cavity, effectively preventing direct damage from mechanical vibration, arc impact, heat, and dust generated during main circuit operation.

[0038] Example 5, a further preferred embodiment of Example 1, includes a grounding switch outgoing contact 6 comprising an outgoing contact body. One end of the outgoing contact body is provided with a terminal for connecting an external cable, and the other end is provided with a perforated contact for interlocking with the grounding contact of the circuit breaker trolley 8. A grounding conductive plate is fixedly installed on the lower surface of the outgoing contact body, and the grounding conductive plate is connected to a conductive rod inside the outgoing contact body. The lower end of the grounding conductive plate is connected to the grounding blade of the grounding switch assembly 4. By integrating the three traditionally independent functional components—the outgoing contact, the stationary grounding contact, and the cable interface—into a unified grounding switch outgoing contact 6, when the circuit breaker trolley is advanced to the working position, its moving contact inserts into the perforated contact, and simultaneously its grounding contact contacts the grounding conductive plate. This process completes the two critical connections of main circuit conduction and trolley grounding in one step, resulting in fewer connection points, lower resistance, and significantly higher reliability than the method of reconnecting multiple components piecemeal. This allows maintenance personnel to simultaneously connect or disconnect the main circuit and grounding circuit with just one action: "pulling in / pulling out the handcart." This simplifies the operation process and avoids omissions or errors that may result from multiple steps.

[0039] In Example 6, as a further preferred embodiment of Example 1, a support base 13 is fixedly installed below the main cavity 1. The support base is integrally formed from high-strength cast steel. Serving as the sole interface between the entire high-explosive device and the installation foundation, the support base evenly distributes the weight and internal operating forces of all upper components, including the main cavity and busbar cavity, to the ground or steel platform. This ensures structural stability during long-term operation or under external forces, preventing the cabinet from twisting or deforming due to uneven stress. Furthermore, when installing on uneven ground underground, the leveling bolts on the base can easily adjust the device's horizontal and vertical alignment, eliminating the need for complex shim adjustments, greatly simplifying the installation process and ensuring installation quality. It also provides ample bending radius space and a fixed position for thick cables drawn from the cable trench, ensuring neat and orderly cable routing and preventing excessive bending or compression of the cables. This ensures electrical safety and facilitates daily inspection and maintenance.

[0040] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A novel high-explosive device for a grounding contact with a built-in grounding switch, characterized in that: Includes a main cavity (1), a busbar cavity (2) is provided on the rear side of the main cavity (1), a sinking cavity (3) is provided below the rear side of the inner cavity of the main cavity (1), and a grounding knife assembly (4) is installed at the bottom of the sinking cavity (3). The main cavity (1) and the busbar cavity (2) are separated by a stepped partition (5). The lower half of the stepped partition (5) is fixedly fitted with a grounding knife outlet contact (6). When the grounding knife switch of the grounding knife assembly (4) contacts the contact end of the grounding knife outlet contact (6), the grounding blade of the grounding knife assembly (4) is in a vertical state. The upper half of the stepped partition (5) is fixedly embedded with a main busbar contact (7), and a circuit breaker trolley (8) is movably installed in the main cavity (1). When the circuit breaker trolley (8) is pushed to the working position, the moving contact at the rear end of the circuit breaker trolley (8) is tightly connected with the main busbar contact (7) and the main circuit is connected. At the same time, the grounding contact of the circuit breaker trolley (8) and the grounding knife outlet contact (6) form an electrical connection.

2. The novel high-explosive device with a built-in grounding switch in the grounding contact according to claim 1, characterized in that: The busbar cavity (2) includes an upper busbar cavity (201) and a lower busbar cavity (202). The upper busbar cavity (201) and the lower busbar cavity (202) are separated by an insulating partition (203). The lower busbar cavity (202) is located in the lower half of the stepped partition (5). The bottom of the lower busbar cavity (202) is provided with an inlet / outlet cable inlet interface (204) for connecting external cables. After the external cable passes through the inlet / outlet cable inlet interface (204) and enters the lower busbar cavity (202), it is connected to the terminal of the grounding switch outlet contact (6). The upper busbar chamber (201) is fixedly installed with a main busbar copper busbar (9), which is connected to the wiring terminals of the main busbar contact (7).

3. The novel high-explosive device with built-in grounding switch in the grounding contact according to claim 2, characterized in that: The upper busbar chamber (201) is provided with connecting flanges on both the left and right sides. The left and right sides of the upper busbar chamber (201) are fixedly connected to the left wiring chamber (10) and the right wiring chamber (11) through the connecting flanges. The two ends of the main busbar copper busbar (9) extend into the left wiring chamber (10) and the right wiring chamber (11) respectively. The main busbar copper busbar (9) and the left and right side walls of the upper busbar chamber (201) are electrically isolated through insulating connecting sleeves. Cable outlet interfaces are fixedly installed below the left wiring chamber (10) and the right wiring chamber (11).

4. The novel high-explosive device with a built-in grounding switch in the grounding contact according to claim 1, characterized in that: A remote control wiring cavity is provided above the main cavity (1), and a control line terminal block is provided inside the remote control wiring cavity (12); the remote control wiring cavity is connected to the secondary plug of the circuit breaker truck (8) through a wire.

5. A novel high-explosive device for a grounding contact with a built-in grounding switch according to claim 1, characterized in that: The grounding knife outgoing contact (6) includes an outgoing contact body. One end of the outgoing contact body is provided with a terminal for connecting an external cable. The other end of the outgoing contact body is provided with a plum blossom contact for mating with the grounding contact of the circuit breaker trolley (8). A grounding conductive plate is fixedly installed on the lower surface of the outgoing contact body. The grounding conductive plate is connected to the conductive rod inside the outgoing contact body. The lower end of the grounding conductive plate is mated with the grounding blade of the grounding knife assembly (4).

6. A novel high-explosive device for a grounding contact with a built-in grounding switch according to claim 1, characterized in that: A support base (13) is fixedly installed below the main cavity (1).

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