Explosion-proof power plug

Abstract

The utility model provides a kind of explosion-proof power plug, belong to the technical field of plug, including shell, conducting unit, wiring terminal and ground terminal, shell includes shell and the mounting cover of screwing in shell, shell and mounting cover are enclosed to form accommodating cavity;Conducting unit is located in accommodating cavity, conducting unit includes insulating end cap and the terminal block of being located in insulating end cap, the opposite ends of terminal block are respectively provided with first blind hole and second blind hole, insulating end cap is provided with the first through-hole of being aligned with first blind hole and the second through-hole of being aligned with second blind hole, first blind hole is used to with the conducting terminal plug-in cooperation of power generation equipment;Wiring terminal one end is located in second blind hole, the other end extends to mounting cover, ground terminal is detachably connected in mounting cover.The utility model reduces the maintenance cost of power plug, and dismounting is more convenient.

Description

Technical Field

[0001] This utility model belongs to the technical field of plugs, specifically relating to an explosion-proof power plug. Background Technology

[0002] The three-phase AC power generated by the power generation equipment needs to be connected to the grid side or the client through a power plug, so that the power generation system can be connected to the national grid side or the client for self-use. If the power generation equipment needs to be used in explosion-proof places, in order to ensure electrical safety, the power plug is also required to be an explosion-proof power plug. The reliability and safety of the power plug connection are the core elements to ensure the stable operation of the equipment.

[0003] Currently, traditional explosion-proof power plugs generally adopt an integrated metal sealed structure, with its terminals integrated with the explosion-proof housing. Although this can meet basic explosion-proof requirements, the welded housing structure, due to its non-removable nature, requires the replacement of the entire component during maintenance, resulting in high maintenance costs. Utility Model Content

[0004] This utility model provides an explosion-proof power plug, which aims to solve the technical problem of high maintenance costs caused by replacing the entire power plug.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: to provide an explosion-proof power plug, comprising:

[0006] The outer casing includes a housing and a mounting cover screwed to the housing, the housing and the mounting cover forming a receiving cavity;

[0007] A conductive unit is disposed within the receiving cavity. The conductive unit includes an insulating end cap and a terminal block disposed within the insulating end cap. A first blind hole and a second blind hole are respectively provided at opposite ends of the terminal block. The insulating end cap is provided with a first through hole aligned with the first blind hole and a second through hole aligned with the second blind hole. The first blind hole is used for insertion and mating with the conductive terminal of the power generation equipment.

[0008] A wiring terminal, one end of which is located in the second blind hole, and the other end extending into the mounting cover, and

[0009] The ground terminal is detachably connected to the mounting cover.

[0010] In one possible implementation, the conductive unit further includes:

[0011] An insulating sleeve, one end of which is disposed within the first through hole, is used to enclose the conductive terminal; and

[0012] An insulating base is disposed inside the mounting cover, and the insulating base has mounting holes for the wiring terminals to pass through.

[0013] In one possible implementation, the insulating base is further provided with a first limiting groove, the first limiting groove being radially connected to the mounting hole, and the terminal block being provided with a first limiting part that engages with the first limiting groove.

[0014] In one possible implementation, the outer periphery of the insulating base is provided with a second limiting portion, which is engaged and adapted to the mounting cover.

[0015] In one possible implementation, a second limiting ring is also fitted over the insulating end cap, and the second limiting ring abuts against the insulating seat along the axial direction.

[0016] In one possible implementation, the insulating end cap includes:

[0017] A front end cover is located at the end of the housing furthest from the mounting cover; and

[0018] A rear end cover is disposed between the insulating base and the front end cover, and the rear end cover and the front end cover are detachably connected.

[0019] In one possible implementation, the explosion-proof power plug further includes a fixing seat with a limiting groove, the front end cover being inserted into the limiting groove, the fixing seat having a limiting part inserted into the receiving cavity and a mounting part abutting against the end face of the housing, the mounting part being detachably connected to the housing.

[0020] In one possible implementation, the end face of the mounting part away from the limiting part is provided with an annular first placement groove, and a first sealing ring is provided in the first placement groove.

[0021] In one possible implementation, the outer periphery of the front end cover is provided with an annular second placement groove, and a second sealing ring is provided in the second placement groove.

[0022] In one possible implementation, contact springs are provided in both the first blind hole and the second blind hole.

[0023] The explosion-proof power plug provided by this utility model, compared with the prior art, features a first blind hole for direct insertion into the conductive terminals of the power generation equipment, and a second blind hole for connection to the external power grid via a terminal block, forming a reliable three-phase conductive path. The grounding terminal is independently installed on the mounting cover, facilitating individual maintenance or replacement and ensuring grounding continuity. The shell and mounting cover employ a threaded split design, allowing for quick separation of the shell and rear shell during maintenance to expose the internal structure. When the power generation equipment requires maintenance, simply separate the shell and mounting cover, detaching the terminal block from the second blind hole. At this point, the conductive unit is connected to the conductive terminals, and the terminal block is connected to the external power grid, allowing for rapid reassembly after maintenance. This invention adopts a split structure, breaking away from the integrated constraints of traditional welded shells. While ensuring the structural strength of the explosion-proof cavity, it enables independent maintenance and replacement of core components such as the conductive unit and terminal blocks, reducing maintenance costs. Attached Figure Description

[0024] Figure 1 This is a cross-sectional view of the explosion-proof power plug according to an embodiment of the present invention;

[0025] Figure 2 for Figure 1 A magnified view of part A in the diagram.

[0026] Explanation of reference numerals in the attached figures:

[0027] 10. Outer shell; 101. Housing; 1011. Second limiting retaining ring; 102. Mounting cover; 1021. First limiting retaining ring; 103. Receiving cavity;

[0028] 20. Conductive unit; 201. Insulating end cap; 2011. First through hole; 2012. Second through hole; 2013. Front end cap; 2014. Rear end cap; 2015. Second placement groove; 2016. Second sealing ring; 202. Terminal base; 2021. First blind hole; 2022. Second blind hole; 203. Insulating sleeve; 204. Insulating base; 2041. Mounting hole; 2042. First limiting groove; 2043. Elastic retaining ring; 2044. Second limiting part;

[0029] 30. Conductive terminals;

[0030] 40. Terminal block; 401. First limiting part;

[0031] 50. Grounding terminal;

[0032] 60. Fixing base; 601. Limiting groove; 602. Limiting part; 603. Mounting part; 604. First placement groove; 605. First sealing ring;

[0033] 70. Grand Head. Detailed Implementation

[0034] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0035] Please refer to the following: Figures 1 to 2 This invention describes an explosion-proof power plug. An explosion-proof power plug includes a housing 10, a conductive unit 20, terminals 40, and a ground terminal 50. The housing 10 includes a shell 101 and a mounting cover 102 screwed to the shell 101, the shell 101 and the mounting cover 102 forming a receiving cavity 103. The conductive unit 20 is disposed within the shell 101 and the receiving cavity 103. The conductive unit 20 includes an insulating end cap 201 and a terminal block 202 disposed within the insulating end cap 201. The two opposite ends of 2 are respectively provided with a first blind hole 2021 and a second blind hole 2022. The insulating end cover 201 is provided with a first through hole 2011 aligned with the first blind hole 2021 and a second through hole 2012 aligned with the second blind hole 2022. The first blind hole 2021 is used to be plugged into the conductive terminal 30 of the power generation equipment. One end of the wiring terminal 40 is provided in the second blind hole 2022, and the other end extends into the mounting cover 102. The ground terminal 50 is detachably connected to the mounting cover 102.

[0036] Specifically, three blind holes 2021 and two blind holes 2022 are provided around the central axis of the terminal block 202.

[0037] It should be noted that the explosion-proof enclosure has an overall cup shape and is made of aluminum alloy with high strength and light weight. The threaded mating surface meets the explosion-proof requirements. The ground terminal 50 is detachably connected to the mounting cover 102 by bolts. Specifically, the ground terminal 50 is located on the inside of the mounting cover 102.

[0038] Compared with the prior art, the explosion-proof power plug provided in this embodiment has a first blind hole 2021 that directly connects to the conductive terminal 30 of the power generation equipment, and a second blind hole 2022 that connects to the external power grid through the wiring terminal 40, forming a reliable three-phase conductive path. The ground terminal 50 is independently installed on the mounting cover 102, which facilitates individual maintenance or replacement and ensures grounding continuity. The housing 101 and the mounting cover 102 adopt a split design with threaded connection, which allows the housing 101 and the rear shell of the outer casing to be quickly separated to expose the internal structure during maintenance. When the power generation equipment needs maintenance, only the housing 101 and the mounting cover 102 need to be separated, and the wiring terminal 40 is detached from the second blind hole 2022. At this time, the conductive unit 20 is connected to the conductive terminal 30, and the wiring terminal 40 is connected to the external power grid. It can be quickly reassembled after maintenance. The present invention adopts a split structure, breaking the integrated constraints of the traditional integral welded housing 10. While ensuring the structural strength of the explosion-proof cavity, it realizes the independent maintenance and replacement of core components such as the conductive unit 20 and the wiring terminal 40, reducing maintenance costs.

[0039] In some embodiments, see Figure 2 The conductive unit 20 also includes an insulating sleeve 203 and an insulating base 204; one end of the insulating sleeve 203 is disposed in the first through hole 2011, and the insulating sleeve 203 is used to wrap the conductive terminal 30; the insulating base 204 is disposed in the mounting cover 102, and the insulating base 204 has a mounting hole 2041 for the wiring terminal 40 to pass through.

[0040] Optionally, the insulating sleeve 203 is threaded to the inner wall of the first through hole 2011.

[0041] Optionally, the insulating sleeve 203 is inserted into and interference-fitted with the first through hole 2011.

[0042] It should be noted that the insulating sheath 203 is made of PEEK engineering material, which is easy to machine, resistant to high temperature, has good flame retardancy, and stable insulation.

[0043] The double-layer protection of the insulating sleeve 203 and the insulating base 204 effectively solves the explosion hazard caused by insulation failure in traditional plugs under complex working conditions. The structural design of the insulating sleeve 203 wrapping the conductive terminal 30 can not only absorb the instantaneous impact force during the insertion and removal process, but also prevent the insulation material from generating micro-cracks due to stress concentration. Furthermore, through the viscoelastic deformation characteristics of the material itself, it can compensate for assembly tolerances, ensure stress matching between components with different thermal expansion coefficients, and eliminate the risk of air gap discharge caused by temperature changes.

[0044] The insulating base 204 constrains the position of the terminal 40 through the mounting hole 2041, and forms a rigid support in combination with the structure of the mounting cover 102, eliminating the risk of displacement caused by external forces.

[0045] If the insulating sleeve 203 is connected by a thread, the spiral meshing structure forms a multi-path sealing barrier, and the elastic deformation of the thread pair can absorb most of the vibration energy, and it is easy to disassemble and assemble. If the insulating sleeve 203 is connected by an interference fit, the relative movement between the conductive terminal 30 and the insulating sleeve 203 is completely eliminated, and the gapless design blocks the penetration path of corrosive media.

[0046] In some embodiments, see Figure 2 The insulating base 204 is also provided with a first limiting groove 2042, which is radially connected to the mounting hole 2041. The terminal 40 is provided with a first limiting part 401 that engages with the first limiting groove 2042.

[0047] Optionally, the first limiting part 401 can be made of plastic. During the process of inserting the first limiting part 401 into the first limiting groove 2042, it can undergo radial deformation. After the first limiting part 401 is inserted into the first limiting groove 2042, it recovers its deformation and is stuck in the first limiting groove 2042, thereby limiting the axial displacement of the insulating terminal 40.

[0048] Optional, see Figure 2 The first limiting groove 2042 has an L-shaped cross section, and the inner wall of the mounting hole 2041 is provided with an elastic retaining ring 2043. The first limiting part 401 abuts axially between the first limiting groove 2042 and the elastic retaining ring 2043.

[0049] During the insertion of the terminal 40 into the mounting hole 2041, the elastic retaining ring 2043 undergoes radial deformation after being compressed. After the terminal 40 is fully inserted into the mounting hole 2041, the elastic retaining ring 2043 returns to its original shape, thereby clamping the first limiting part 401 with the first limiting groove 2042 and the elastic retaining ring 2043. The elastic retaining ring 2043 and the first limiting groove 2042 work together to form a dual constraint mechanism, which, together with the first limiting part 401, reliably fixes the terminal 40, achieving axial locking of the terminal 40 and preventing the terminal 40 from falling off.

[0050] Optionally, the first limiting part 401 may be a plurality of first limiting blocks arranged at intervals.

[0051] Optionally, the first limiting part 401 may be an annular first limiting block.

[0052] In some embodiments, see Figure 2 The outer periphery of the insulating base 204 is provided with a second limiting part 2044, which is engaged and adapted to the mounting cover 102.

[0053] Optionally, the inner wall of the mounting cover 102 is provided with an annular second limiting groove. The second limiting part 2044 can be made of plastic. The second limiting part 2044 can undergo radial deformation during the process of being inserted into the second limiting groove. After the second limiting part 2044 is inserted into the first limiting groove, it recovers its deformation and is stuck in the second limiting groove. Thus, the axial displacement of the insulating seat is limited by the second limiting part 2044.

[0054] Optional, see Figure 2 The housing 101 extends into the mounting cover 102. The inner wall of the mounting cover 102 is provided with a first limiting ring 1021, and the second limiting part 2044 axially abuts against the first limiting ring 1021 and the housing 101.

[0055] Specifically, the first limit stop ring 1021 is an aviation stop ring.

[0056] During the installation of the insulating seat 204, the insulating seat 204 presses against the first limiting ring 1021, causing the first limiting ring 1021 to undergo radial deformation. After the insulating seat 204 is installed, the first limiting ring 1021 returns to its original deformation. Thus, the first limiting ring 1021 and the end face of the housing 101 together clamp the second limiting part 2044 of the insulating seat 204, forming a multi-point mechanical fixation to prevent the insulating seat 204 from axially moving and to prevent the insulating seat 204 from falling off.

[0057] Optionally, the second limiting part 2044 may be a plurality of second limiting blocks spaced apart.

[0058] Optionally, the second limiting part 2044 may be an annular second limiting block.

[0059] In some embodiments, a second limiting ring is also provided outside the insulating end cap 201, and the second limiting ring abuts against the insulating seat 204 along the axial direction.

[0060] Specifically, the second limit stop ring 1011 is an aviation stop ring.

[0061] The second limiting ring 1011 abuts against the insulating seat 204 to create a constraint, further limiting the displacement of the insulating seat 204 and preventing the internal conductive unit 20 from shifting due to external impact, thus ensuring the accuracy of the explosion-proof mating surface. At the same time, the second limiting ring 1011 seals the gap between the insulating seat 204 and the insulating end cap 201 to ensure the overall sealing and prevent the explosion-proof surface from failing to airtight.

[0062] In some embodiments, see Figure 2The insulating end cap 201 includes a front end cap 2013 and a rear end cap 2014; the front end cap 2013 is located at the end of the housing 101 away from the mounting cover 102; the rear end cap 2014 is located between the insulating base 204 and the front end cap 2013, and the rear end cap 2014 and the front end cap 2013 are detachably connected.

[0063] It should be noted that the front cover 2013 and the rear cover 2014 are fixed together by bolts; both the front cover 2013 and the rear cover 2014 are made of PEEK engineering material, which is easy to machine, high temperature resistant, flame retardant and has stable insulation.

[0064] The traditional integral insulating end cover 201 is deconstructed into a front end cover 2013 and a rear end cover 2014 that can be replaced independently. This allows maintenance personnel to disassemble the insulating end cover 201 and terminals without damaging the explosion-proof surface of the housing using only a torque wrench, thus balancing maintenance convenience and explosion-proof integrity. The split design of the front end cover 2013 and the rear end cover 2014 allows for the individual replacement of damaged parts, avoiding the need for complete scrapping.

[0065] In some embodiments, see Figure 2 The explosion-proof power plug also includes a fixing seat 60 with a limiting groove 601. The front end cover 2013 is inserted into the limiting groove 601. The fixing seat 60 has a limiting part 602 inserted into the receiving cavity 103 and a mounting part 603 abutting against the end face of the housing 101. The mounting part 603 is detachably connected to the housing 101.

[0066] It should be noted that the mounting base 60 is also detachably connected to the power generation equipment.

[0067] Specifically, the mounting base 60 is fixed to the housing 101 and the power generation equipment by bolts.

[0068] Specifically, the inner wall of the housing 101 is provided with a clearance groove for the limiting part 602 to extend into, thereby ensuring that the front cover 2013 and the rear cover 2014 have the same diameter and eliminating stress concentration caused by abrupt changes in cross-section.

[0069] The mounting bracket 60 rigidly connects the plug to the power generation equipment, improving the mechanical strength of the plug and equipment interface, forming a dual connection point, dispersing insertion and extraction stress, and reducing the risk of wear on the outer shell threads. The outer edge of the mounting bracket 60 is fixed to the housing 101, constructing a dual mechanical anchoring point, dispersing the concentrated stress during the insertion and extraction process into axial compressive stress and radial shear stress, and enhancing the load per unit area. The mounting bracket 60 and the power generation equipment adopt a detachable design to facilitate quick installation or replacement of the plug, adapting to frequent insertion and extraction scenarios.

[0070] In some embodiments, see Figure 2The mounting part 603 has an annular first placement groove 604 on its end face away from the limiting part 602, and a first sealing ring 605 is provided in the first placement groove 604.

[0071] The first sealing ring 605 fills the gap between the fixing seat 60 and the interface of the power generation equipment, blocking the intrusion path of explosive gas and ensuring the sealing of the explosion-proof cavity; the sealing ring in the first placement groove 604 is deformed under pressure and fits tightly against the surface of the power generation equipment to form a static sealing barrier, which can prevent flame leakage and ignition of the external environment even if an internal electric arc explosion occurs.

[0072] In some embodiments, see Figure 2 The front cover 2013 has an annular second placement groove 2015 on its outer periphery, and a second sealing ring 2016 is provided in the second placement groove 2015.

[0073] The second sealing ring 2016 enhances the dynamic seal between the housing 101 and the front cover 2013, adapting to the wear of the mating surface caused by frequent plug disassembly and maintaining long-term explosion-proof performance; the sealing ring in the second placement groove 2015 is compressed when the housing 101 and the front cover 2013 are screwed together, forming an annular sealing strip to prevent explosive gas from seeping into the internal conductive unit 20 area along the thread gap.

[0074] In some embodiments, see Figure 2 Contact springs are provided in both the first blind hole 2021 and the second blind hole 2022.

[0075] When the contact spring is inserted into the conductive terminal 30 or the wiring terminal 40, it undergoes elastic deformation and continuously applies radial pressure to compensate for the insertion tolerance of the conductive terminal 30, ensuring low-resistance contact between the terminal and the inner wall of the blind hole, avoiding the risk of overheating and explosion, and maintaining stable conductivity even with frequent insertion and removal. The self-adaptive wear of the contact spring can extend the insertion and removal life.

[0076] In some embodiments, see Figure 1 The mounting cover 102 has four holes at the end away from the housing 101. Gland connectors 70 are installed in the holes. The gland connectors 70 fix the three-phase cable of the external power grid and the grounding protection cable, and mechanically lock and distribute the stress points of the cable to prevent external force from being directly transmitted to the internal terminal 40 and to prevent the terminal solder joints from breaking. At the same time, the gland connectors 70 usually have waterproof and dustproof design (such as IP protection rating), which fills the gaps while fixing the cable to prevent external moisture, dust or corrosive gases from entering the equipment and extending the service life of the equipment.

[0077] If the cable is not secured, it may shift due to equipment vibration, external pulling force, or long-term gravity, causing the terminal 40 to loosen. Loose contact at the terminal 40 can cause arcing, overheating, or even short circuits, threatening electrical safety. Using a gland 70 to fix the cable position prevents phase disruption and improves safety. If the grounding protection cable is loose, it will cause grounding failure, and the equipment casing may become live, increasing the risk of electric shock. Using a gland 70 ensures that the grounding wire is firmly connected and maintains the protection function.

[0078] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An explosion-proof power plug, characterized in that, include: The outer casing includes a housing and a mounting cover screwed to the housing, the housing and the mounting cover forming a receiving cavity; A conductive unit is disposed within the receiving cavity. The conductive unit includes an insulating end cap and a terminal block disposed within the insulating end cap. A first blind hole and a second blind hole are respectively provided at opposite ends of the terminal block. The insulating end cap is provided with a first through hole aligned with the first blind hole and a second through hole aligned with the second blind hole. The first blind hole is used for insertion and mating with the conductive terminal of the power generation equipment. A wiring terminal, one end of which is located in the second blind hole, and the other end extending into the mounting cover, and The ground terminal is detachably connected to the mounting cover.

2. The explosion-proof power plug as described in claim 1, characterized in that, The conductive unit further includes: An insulating sleeve, one end of which is disposed within the first through hole, is used to enclose the conductive terminal; and An insulating base is disposed inside the mounting cover, and the insulating base has mounting holes for the wiring terminals to pass through.

3. The explosion-proof power plug as described in claim 2, characterized in that, The insulating base is also provided with a first limiting groove, which is radially connected to the mounting hole. The terminal block is provided with a first limiting part that engages with the first limiting groove.

4. The explosion-proof power plug as described in claim 2, characterized in that, The outer periphery of the insulating base is provided with a second limiting part, which is engaged and adapted to the mounting cover.

5. The explosion-proof power plug as described in claim 4, characterized in that, A second limiting ring is also fitted outside the insulating end cap, and the second limiting ring abuts against the insulating seat along the axial direction.

6. The explosion-proof power plug as described in claim 2, characterized in that, The insulating end cap includes: A front end cover is located at the end of the housing furthest from the mounting cover; and A rear end cover is disposed between the insulating base and the front end cover, and the rear end cover and the front end cover are detachably connected.

7. The explosion-proof power plug as described in claim 6, characterized in that, The explosion-proof power plug also includes a fixing seat with a limiting groove. The front end cover is inserted into the limiting groove. The fixing seat has a limiting part inserted into the receiving cavity and a mounting part abutting against the end face of the housing. The mounting part is detachably connected to the housing.

8. The explosion-proof power plug as described in claim 7, characterized in that, The mounting part has an annular first placement groove on the end face away from the limiting part, and a first sealing ring is provided in the first placement groove.

9. The explosion-proof power plug as described in claim 6, characterized in that, The outer periphery of the front end cover is provided with an annular second placement groove, and a second sealing ring is provided in the second placement groove.

10. The explosion-proof power plug as described in claim 1, characterized in that, Both the first blind hole and the second blind hole are provided with contact springs.

Images