Explosion-proof connector and magnetic suspension pressure expansion machine

Abstract

The embodiment of the utility model discloses an explosion-proof connector and a magnetic suspension pressure expansion machine, and the explosion-proof connector comprises a first joint, a second joint and a protective shell. The first connector is used for being connected with a first cable and electrically conducted. The second connector is detachably matched with the first connector in an inserting manner, and the first connector is electrically conducted with the second connector; the protective shell is detachably connected with the second connector, a cavity is formed in the protective shell, at least part of the second connector is embedded into the cavity, and the cavity is further used for allowing the second cable to stretch into, so that the second cable and the part, embedded into the cavity, of the second connector are connected and electrically conducted. The explosion-proof connector in the embodiment of the utility model can be applied to an environment with an explosion-proof requirement, and the cost can be reduced when cables with different outer diameters are replaced.

Description

Technical Field

[0001] The present application relates to the technical field of cable joints, and in particular to an explosion-proof connector and a magnetic suspension compression and expansion machine. Background Art

[0002] As the demand for reducing carbon emissions from ships becomes increasingly prominent, the use of LNG (Liquefied Natural Gas) fuel has become a trend in recent years, resulting in an annual increase in the number of LNG-powered ships. The LNG cryogenic reliquefaction device has become one of the standard features of LNG-powered ships. Because it uses a magnetic levitation compressor, it has become one of the high-tech, high-difficulty, and high-value-added equipment. The cabin space of LNG-powered ships is limited, so the size design of each component of the LNG cryogenic reliquefaction device is required to be high. In addition, since the LNG cryogenic reliquefaction device is used for LNG and there is a risk of explosion, its related components need to have explosion-proof properties. In general, the LNG cryogenic reliquefaction device needs to have a compact design and explosion-proof function.

[0003] As a high-power core component of the LNG cryogenic reliquefaction device, the maglev compressor is equipped with a high-power explosion-proof electrical connection box. Since the power of the maglev compressor is usually above 100kW, the cables are relatively thick, and the phases must not be too close to each other, the existing explosion-proof electrical connection boxes are usually large in size. Not only does it take up space, it is also not beautiful. In addition, due to the large size of the electrical box and the relatively thick cover, the space in the cabin of the LNG-powered ship is small and difficult to disassemble and assemble, which not only brings great inconvenience to the installation and maintenance of the maglev compressor, but also affects the integration and compactness of the entire device.

[0004] The explosion-proof connector is used to selectively electrically connect two cables. The explosion-proof connector includes two plug-in components, which are respectively connected to two cables. After the two plug-in components are plugged in and matched, an explosion-proof cavity is formed to accommodate the plug-in mating parts of the two plug-in components, and the plug-in mating parts are isolated from the outside world. Cables of different diameters correspond to plug-in components of different specifications. Each cable is connected to a plug-in component that matches its diameter. In the use scenario where cables of different diameters need to be replaced, the corresponding plug-in component needs to be replaced, resulting in a high cost of use. Utility Model Content

[0005] The embodiments of the present application provide an explosion-proof connector and a magnetic levitation compression and expansion machine to reduce the cost of use.

[0006] In order to solve the above technical problems, the embodiments of the present application disclose the following technical solutions:

[0007] On the one hand, an explosion-proof connector is provided, which includes a first connector, a second connector and a protective shell. The first connector is used to connect with a first cable and be electrically conductive; the second connector is detachably plugged into the first connector, and the first connector and the second connector are electrically conductive; the protective shell is detachably connected to the second connector, and the protective shell has a cavity inside, at least part of the second connector is embedded in the cavity, and the cavity is also for the second cable to extend into, so that the second cable is connected to the part of the second connector embedded in the cavity and is electrically conductive.

[0008] In addition to or as an alternative to one or more of the features disclosed above, the protective shell includes a shell body and a cover body. The shell body is detachably connected to the second joint and has a cavity, and the shell body also has an opening connected to the cavity; the cover body is detachably connected to the shell body and closes the opening.

[0009] In addition to or as an alternative to one or more of the features disclosed above, the cover is embedded in the opening and is threadedly connected to the shell body.

[0010] In addition to or as an alternative to one or more of the features disclosed above, the cover includes a main body and a protruding portion. The main body is embedded in the opening and is threadedly connected to the shell body; the protruding portion is protruding on the side of the main body away from the cavity, with the axial direction of the opening as the projection direction, and the projection of the protruding portion on the main body is a polygon.

[0011] In addition to or as an alternative to one or more of the features disclosed above, the protective shell is sleeved outside the second joint and is threadedly connected to the second joint.

[0012] In addition to one or more of the features disclosed above, or as an alternative, the explosion-proof connector further includes a sealing joint, which is passed through the protective shell and is used to be sleeved outside the second cable to seal the second cable and connect it to the protective shell.

[0013] In addition to or as an alternative to one or more of the features disclosed above, the sealing joint is an explosion-proof stuffing box.

[0014] In addition to or as an alternative to one or more of the features disclosed above, the opening is arranged opposite to the portion of the second joint embedded in the cavity in its axial direction.

[0015] In addition to or as an alternative to one or more of the features disclosed above, the explosion-proof connector further comprises a fastener, which is located in the cavity and is detachably connected to a portion of the second connector embedded in the cavity, for locking the second cable to the second connector.

[0016] In addition to or instead of one or more of the features disclosed above, the fastener includes a screw and an abutment portion located at one end of the screw, the abutment portion protruding from the screw in a radial direction of the screw, the screw thread being connected to a portion of the second connector embedded in the cavity, and the abutment portion abuts the second cable against the portion of the second connector embedded in the cavity along the axial direction of the screw.

[0017] In addition to or as an alternative to one or more of the features disclosed above, the first connector includes a first connector body and a first plug-in portion disposed on the first connector body, the first plug-in portion being used for electrical conduction with the first cable;

[0018] The second connector includes a second connector body and a second plug-in portion disposed on the second connector body, the protective shell is detachably connected to the second connector body, and at least a portion of the second connector body is embedded in the cavity to be connected to the second cable and electrically conductive;

[0019] The first connector body and the second connector body are detachably connected and enclosed to form an explosion-proof cavity. The first plug-in portion and the second plug-in portion are located in the explosion-proof cavity. One of the first plug-in portion and the second plug-in portion is provided with a plug-in slot, and the other is detachably plugged into the plug-in slot, and the first plug-in portion and the second plug-in portion are electrically conductive.

[0020] In addition to or as an alternative to one or more of the features disclosed above, the first connector body includes a first base and a first sleeve, the first sleeve and the first plug-in portion are convexly arranged on the same side of the first base along a predetermined direction, and the first sleeve is arranged around the outer periphery of the first plug-in portion;

[0021] The second connector body includes a second base, a second sleeve and a connecting portion, wherein the second base is arranged opposite to the first base in a predetermined direction, the second sleeve and the second plug-in portion are convexly arranged on the same side of the second base in the opposite direction of the predetermined direction, the connecting portion is convexly arranged on the other side of the second base in the predetermined direction, embedded in the cavity and used for connecting with the second cable and conducting electricity, and the second sleeve is arranged around the outer periphery of the second plug-in portion;

[0022] The first sleeve and the second sleeve are sleeved with each other, and the first base, the first sleeve, the second sleeve and the second base are surrounded to form an explosion-proof cavity.

[0023] In addition to one or more of the features disclosed above, or as an alternative, the second connector body also includes a limiting portion, which is arranged outside the second sleeve, and the second sleeve is sleeved inside the first sleeve. The explosion-proof connector also includes a sealing ring and a locking piece. The sealing ring is axially arranged in a predetermined direction, and is clamped between the end face of the first sleeve at one end away from the first base and the limiting portion along the predetermined direction. The locking piece is respectively sleeved outside the first sleeve and the second sleeve, and one end of the locking piece along the predetermined direction is threadedly connected to the first sleeve, and the other end abuts against the limiting portion along the predetermined direction, so that the limiting portion presses against the sealing ring.

[0024] On the other hand, the present application also provides a magnetic levitation compressive machine, which includes any of the above-mentioned explosion-proof connectors.

[0025] One of the above technical solutions has the following advantages or beneficial effects:

[0026] In this technical solution, the protective shell can isolate the connection between the second cable and the second connector from the outside world, thereby reducing the risk of electric sparks at the connection igniting external flammable gases. The outer diameter of the second cable corresponds to the specifications of the protective shell. The specifications of the protective shell correspond to the outer diameter of the second cable. When replacing a second cable with a different outer diameter, it is only necessary to replace the protective shell of the corresponding specifications without replacing the second connector. Compared with the prior art, in this proposal, only a part of the plug-in assembly needs to be replaced, rather than the entire plug-in assembly, thereby reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0028] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of an explosion-proof connector of the present application;

[0029] Figure 2 yes Figure 1 A cross-sectional view of the explosion-proof connector shown;

[0030] Figure 3 yes Figure 1 A three-dimensional exploded view of the explosion-proof connector shown;

[0031] Figure 4 yes Figure 1 A three-dimensional exploded view of the protective housing in the explosion-proof connector shown;

[0032] Figure 5 yes Figure 1 A cross-sectional view of the connection between the protective shell and the sealing joint in the explosion-proof connector shown;

[0033] Figure 6 yes Figure 2 An enlarged view of the partial view A in FIG.

[0034] Figure 7 yes Figure 1 A cross-sectional view of a first joint and a second joint in the explosion-proof connector;

[0035] Figure 8 yes Figure 7 An enlarged view of detail view B in FIG.

[0036] Explanation of the reference numerals: 10-first cable; 20-second cable; 30-explosion-proof connector; 310-first joint; 311-first base; 312-first sleeve; 313-first plug-in portion; 314-first joint body; 320-second joint; 321-second base; 322-second sleeve; 323-second plug-in portion; 3231-plug-in slot; 324-limiting portion; 325-connecting portion; 326-second connecting body; 330-locking member; 340-protective shell; 341-shell body; 3411-opening; 342-cover body; 3421-main body; 3422-protrusion; 350-sealing joint; 351-mounting hole; 360-explosion-proof cavity; 370-cavity; 380-fastener; 381-screw; 382-abutting portion; 390-sealing ring; F-predetermined direction. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and beneficial effects of this application more clear, the following further describes this application in detail in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for explaining this application, not for limiting this application.

[0038] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0039] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0041] See also Figures 1 to 3 . Figure 1 It is a schematic diagram of the three-dimensional structure of an embodiment of an explosion-proof connector 30 of the present application. Figure 2 yes Figure 1 A cross-sectional view of an explosion-proof connector 30 is shown. Figure 3 yes Figure 1 A three-dimensional exploded view of the explosion-proof connector 30 is shown.

[0042] The explosion-proof connector 30 is used to connect the first cable 10 and the second cable 20 by wires.

[0043] In some embodiments, the explosion-proof connector 30 includes a first connector 310, a second connector 320, and a protective shell 340. The first connector 310 is used to connect and electrically connect with the first cable 10. The second connector 320 is removably plugged with the first connector 310, and the first connector 310 is electrically connected with the second connector 320. The protective shell 340 is removably connected with the second connector 320, and the interior of the protective shell 340 has a cavity 370. At least part of the second connector 320 is embedded in the cavity 370, and the cavity 370 is also for the second cable 20 to extend into, so that the second cable 20 is connected and electrically connected with the part of the second connector 320 embedded in the cavity 370.

[0044] After the first connector 310 and the second connector 320 are plugged together, an explosion-proof cavity 360 is formed. The plug-in fitting point P1 of the first connector 310 and the second connector 320 is located in the explosion-proof cavity 360 and isolated from the outside world, so as to prevent the electric spark at the plug-in fitting point P1 from igniting external flammable gas. In some embodiments, the explosion-proof cavity 360 is a closed cavity, so that the plug-in fitting point P1 is completely isolated from the outside world.

[0045] The connection point P2 between the second cable 20 and the second connector 320 is located in the cavity 370, and the protective shell 340 can isolate the connection point P2 between the second cable 20 and the second connector 320 from the outside world, thereby reducing the risk of the electric spark at the connection point P2 igniting the external flammable gas. In some embodiments, the cavity 370 is a closed cavity, so that the connection point P2 is completely isolated from the outside world.

[0046] In one usage scenario, the first connector 310 is fixedly disposed on the shell of the explosion-proof electrical box. The first cable 10 is led out from the explosion-proof electrical box and connected to the first connector 310. One end of the second cable 20 is connected to the second connector 320 and the protective shell 340, and the other end is connected to other electrical appliances. The operator plugs the first connector 310 and the second connector 320 into each other, and locks the first connector 310 and the second connector 320, thereby achieving electrical connection between the first cable 10 and the second cable 20. The operator unlocks the first connector 310 and the second connector 320, and separates the first connector 310 and the second connector 320, thereby disconnecting the electrical connection between the first cable 10 and the second cable 20. Specifically, in Figure 1 In the illustrated embodiment, the explosion-proof connector 30 further includes a locking member 330. After the first connector 310 and the second connector 320 are plugged and matched, the first connector 310 and the second connector 320 are locked by the locking member 330 to prevent the first connector 310 and the second connector 320 from accidentally disengaging. In other embodiments, the explosion-proof connector 30 may also not include the locking member 330, and the first connector 310 and the second connector 320 may also be locked by their own structure.

[0047] In one usage scenario, when a second cable 20 with a different outer diameter needs to be replaced, the operator first separates the previous second cable 20 and the previous protective shell 340 from the second connector 320 , and then connects the next second cable 20 and the next protective shell 340 to the second connector 320 .

[0048] The combination of the second connector 320 and the protective shell 340 is equivalent to the plug-in assembly in the prior art. Compared with the prior art, in this proposal, only a part of the plug-in assembly needs to be replaced instead of completely replacing the plug-in assembly, thereby reducing the cost.

[0049] The following describes in detail the structure of the connection point P2 between the second cable 20 and the second connector 320 .

[0050] See also Figure 4 . Figure 4 yes Figure 1 A three-dimensional exploded view of the protective shell 340 in the explosion-proof connector 30 is shown.

[0051] In some embodiments, the protective shell 340 includes a shell body 341 and a cover 342. The shell body 341 is detachably connected to the second connector 320 and has a cavity 370. The shell body 341 also has an opening 3411 communicating with the cavity 370. The cover 342 is detachably connected to the shell body 341 and closes the opening 3411.

[0052] Please also read Figure 2 In a scenario where the second cable 20 is replaced, the replacement process is as follows: Open the cover 342 of the previous protective shell 340, and separate the previous second cable 20 from the second connector 320 through the opening 3411. Separate the shell body 341 of the previous protective shell 340 from the second connector 320. Connect the shell body 341 of the next protective shell 340 to the second connector 320. Extend the next second cable 20 into the cavity 370, and connect the second cable 20 to the second connector 320 through the opening 3411 of the shell body 341 of the next protective shell 340. Close the opening 3411 with the cover 342 of the next protective shell 340.

[0053] Such a configuration makes it easier to connect the second cable 20 to the portion of the second connector 320 embedded in the cavity 370 through the opening 3411 , or to separate the second cable 20 from the portion of the second connector 320 embedded in the cavity 370 through the opening 3411 .

[0054] In some embodiments, the opening 3411 is disposed axially opposite to the portion of the second connector 320 embedded in the cavity 370. This makes operation more convenient for operators.

[0055] In some embodiments, the cover 342 is embedded in the opening 3411 and is threadedly connected to the shell body 341. Specifically, the inner wall of the shell body 341 at the opening 3411 is provided with an internal thread, and the outer peripheral side wall of the cover 342 is provided with an external thread. The cover 342 is threadedly connected to the shell body 341, with a simple structure and small space occupation. In other embodiments, the cover 342 can also be snap-fitted to the shell body 341.

[0056] In some embodiments, the cover 342 includes a main body 3421 and a protrusion 3422. The main body 3421 is embedded in the opening 3411 and is threadedly connected to the shell body 341. The protrusion 3422 is protruding from the side of the main body 3421 away from the cavity 370. With the axial direction of the opening 3411 as the projection direction, the projection of the protrusion 3422 on the main body 3421 is a polygon. Specifically, with the axial direction of the opening 3411 as the projection direction, the projection of the protrusion 3422 on the main body 3421 is a regular hexagon, a quadrilateral or a triangle.

[0057] When installing or removing the cover 342, a tool can be used to engage with the protrusion 3422, thereby driving the main body 3421 to rotate. When the axial direction of the opening 3411 is the projection direction and the projection of the protrusion 3422 on the main body 3421 is a regular hexagon, an open-end wrench can be used to engage with the protrusion 3422, thereby driving the main body 3421 to rotate.

[0058] In some embodiments, the protective shell 340 can be made by a casting process.

[0059] See also Figure 2 . In some embodiments, the protective shell 340 is sleeved outside the second joint 320 and is threadedly connected to the second joint 320. Specifically, one side of the protective shell 340 has an opening, and the inner wall surface at the opening is provided with an internal thread, and correspondingly, the outer wall surface of one end of the second joint 320 is provided with an external thread. The protective shell 340 is sleeved outside the second joint 320, and the second joint 320 blocks the opening, so that the cavity 370 is isolated from the outside. In other embodiments, the protective shell 340 is snap-connected to the second joint 320 or fixedly connected by bolts.

[0060] See also Figure 5 . Figure 5 yes Figure 1 A cross-sectional view of the connection between the protective shell 340 and the sealing joint 350 in the explosion-proof connector 30 is shown.

[0061] In some embodiments, the explosion-proof connector 30 further includes a sealing joint 350. In some embodiments, the sealing joint 350 is an explosion-proof stuffing box. The explosion-proof stuffing box can be a commercially available product. The sealing joint 350 is inserted into the protective shell 340 and is used to be sleeved outside the second cable 20 to seal the second cable 20 and the protective shell 340.

[0062] Specifically, the sealing joint 350 has a penetrating mounting hole 351. The sealing joint 350 is provided in the protective shell 340. In the embodiment where the protective shell 340 has a shell body 341 and a cover body 342, the sealing joint 350 is provided in the shell body 341. The mounting hole 351 is communicated with the cavity 370. The second cable 20 extends into the cavity 370 through the mounting hole 351. The sealing joint 350 seals and connects the second cable 20 to the protective shell 340, that is, the outer wall surface of the sealing joint 350 is sealed and matched with the protective shell 340, and the inner wall surface of the sealing joint 350 is sealed and matched with the second cable 20.

[0063] By providing the sealing joint 350 , it is easier to keep the cavity 370 in a closed environment.

[0064] See also Figure 6 . Figure 6 yes Figure 22 is an enlarged view of partial view A. In some embodiments, the explosion-proof connector 30 further includes a fastener 380 , which is located in the cavity 370 and is detachably connected to a portion of the second connector 320 embedded in the cavity 370 , for locking the second cable 20 to the second connector 320 .

[0065] Specifically, the fastener 380 includes a screw 381 and an abutment portion 382 located at one end of the screw 381, the abutment portion 382 protrudes from the screw 381 in the radial direction of the screw 381, the screw 381 is threadedly connected to the portion of the second connector 320 embedded in the cavity 370, and the abutment portion 382 abuts the second cable 20 against the portion of the second connector 320 embedded in the cavity 370 along the axial direction of the screw 381.

[0066] The following is a detailed description of the specific structure of the plug-in cooperation between the first connector 310 and the second connector 320 .

[0067] See also Figure 7 and Figure 8 . Figure 7 yes Figure 1 A cross-sectional view of a first joint 310 and a second joint 320 in the explosion-proof connector 30 is shown. Figure 8 yes Figure 7 An enlarged view of detail view B in FIG.

[0068] In some embodiments, the first connector 310 includes a first connector body 314 and a first plug-in portion 313 disposed on the first connector body 314, and the first plug-in portion 313 is used to be electrically connected to the first cable 10. The first plug-in portion 313 is electrically insulated from the first connector body 314.

[0069] The second connector 320 includes a second connector body 326 and a second plug-in portion 323 disposed on the second connector body 326. The protective shell 340 is detachably connected to the second connector body 326, and at least a portion of the second connector body 326 is embedded in the cavity 370 to be connected and electrically connected to the second cable 20. The second plug-in portion 323 is electrically insulated from the second connector body 326.

[0070] The first connector body 314 and the second connector body 326 are detachably connected and surround an explosion-proof cavity 360 . The first plug-in portion 313 and the second plug-in portion 323 are located in the explosion-proof cavity 360 .

[0071] One of the first plug-in portion 313 and the second plug-in portion 323 is provided with an inserting slot 3231 , and the other one is detachably inserted into the inserting slot 3231 , and the first plug-in portion 313 and the second plug-in portion 323 are electrically connected.

[0072] Specifically, Figure 7In the embodiment, the plugging slot 3231 is located at the second plugging portion 323. The first plugging portion 313 is plugged into the plugging slot 3231 of the second plugging portion 323. In other embodiments, the plugging slot 3231 may also be located at the first plugging portion 313. Correspondingly, the second plugging portion 323 is plugged into the plugging slot 3231 of the first plugging portion 313.

[0073] In some embodiments, the first connector body 314 includes a first base 311 and a first sleeve 312. The first sleeve 312 and the first plug-in portion 313 are convexly arranged on the same side of the first base 311 along a predetermined direction F. The first sleeve 312 is arranged around the outer periphery of the first plug-in portion 313. The second connector body 326 includes a second base 321, a second sleeve 322 and a connecting portion 325. The second base 321 is arranged opposite to the first base 311 along a predetermined direction F. The second sleeve 322 and the second plug-in portion 323 are convexly arranged on the same side of the second base 321 in the opposite direction of the predetermined direction F. The connecting portion 325 is convexly arranged on the other side of the second base 321 along the predetermined direction F, embedded in the cavity 370 and used to connect with the second cable 20 and conduct electricity. The second sleeve 322 is arranged around the outer periphery of the second plug-in portion 323. Among them, the first sleeve 312 and the second sleeve 322 are mutually sleeved. The first base 311 , the first sleeve 312 , the second sleeve 322 and the second base 321 are arranged to form an explosion-proof cavity 360 .

[0074] Specifically, a plurality of through holes are provided on the first base 311 , and bolts are passed through the through holes to fix the first base 311 at a predetermined position.

[0075] In some embodiments, the second joint body 326 further includes a limiting portion 324. The limiting portion 324 is disposed outside the second sleeve 322. The limiting portion 324 is a protrusion. The second sleeve 322 is sleeved in the first sleeve 312.

[0076] The explosion-proof connector 30 further includes a sealing ring 390 and a locking member 330. The sealing ring 390 is axially arranged in a predetermined direction F and is sandwiched between the end surface of the first sleeve 312 away from the first base 311 and the limiting portion 324 along the predetermined direction F.

[0077] The locking member 330 is respectively sleeved on the first sleeve 312 and the second sleeve 322. One end of the locking member 330 is threadedly connected to the first sleeve 312 along the predetermined direction F, and the other end is abutted against the limit portion 324 along the predetermined direction F, so that the limit portion 324 presses the sealing ring 390.

[0078] The locking member 330 may also adopt other structural forms to detachably connect the first joint 310 and the second joint 320. For example, the locking member 330 is a bolt or a buckle.

[0079] In one usage scenario, the process of plugging and mating the first connector 310 and the second connector 320 is as follows:

[0080] The second sleeve 322 is inserted into the first sleeve 312 until the stopper 324 presses the sealing ring 390 against the first sleeve 312. During the insertion process, the first plug-in portion 313 and the second plug-in portion 323 are plugged and matched and electrically connected. The locking member 330 is rotated so that the locking member 330 is threadedly connected to the first sleeve 312 until the locking member 330 and the stopper 324 are in contact along the predetermined direction F.

[0081] In one usage scenario, the process of separating the first connector 310 and the second connector 320 is as follows:

[0082] The locking member 330 is rotated to separate the locking member 330 from the first sleeve 312. The second sleeve 322 is pulled out of the first sleeve 312. During the pulling out process, the first plug-in portion 313 and the second plug-in portion 323 are separated.

[0083] In summary, the explosion-proof connector 30 provided in the embodiment of the present application makes the wiring structure of the power cable more compact, greatly reducing the space occupation and disassembly and assembly difficulty of the core equipment of the ship's LNG cryogenic reliquefaction device. The explosion-proof connector 30 meets the explosion-proof requirements of LNG ship equipment. The explosion-proof connector 30 also reduces the cost of use.

[0084] The introduction provided in the above steps is only used to help understand the method, structure and core idea of ​​the present application. For ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. An explosion-proof connector, characterized in that: include: A first connector, used to be connected to and electrically connected with a first cable; A second connector is detachably plugged into and matched with the first connector, and the first connector is electrically connected to the second connector; The protective shell is detachably connected to the second connector, and the interior of the protective shell has a cavity, at least a portion of the second connector is embedded in the cavity, and the cavity is also for the second cable to extend into, so that the second cable is connected to the portion of the second connector embedded in the cavity and is electrically conductive.

2. The explosion-proof connector according to claim 1, characterized in that: The protective shell comprises: a shell body, detachably connected to the second joint and having the cavity, and the shell body also having an opening communicating with the cavity; The cover body is detachably connected to the shell body and closes the opening.

3. The connector according to claim 2, characterized in that: The cover body is embedded in the opening and is threadedly connected with the shell body.

4. The connector according to claim 3, characterized in that: The cover body comprises: A main body portion, embedded in the opening and threadedly connected to the shell body; The protrusion is convexly arranged on the side of the main body away from the cavity, and the projection of the protrusion on the main body is a polygon with the axial direction of the opening as the projection direction.

5. The explosion-proof connector according to claim 1, characterized in that: The protective shell is sleeved outside the second joint and is threadedly connected to the second joint.

6. The explosion-proof connector according to claim 1, characterized in that: Also includes: A sealing joint is passed through the protective shell and is used to be sleeved outside the second cable to seal the second cable and connect it to the protective shell.

7. The explosion-proof connector according to claim 6, characterized in that: The sealing joint is an explosion-proof stuffing box.

8. The explosion-proof connector according to claim 2, characterized in that: The opening is arranged opposite to the portion of the second joint embedded in the cavity in its axial direction.

9. The explosion-proof connector according to claim 8, characterized in that: Also includes: A fastener is located in the cavity and is detachably connected to a portion of the second connector embedded in the cavity, and is used to lock the second cable to the second connector.

10. The explosion-proof connector according to claim 9, characterized in that: The fastener includes a screw and an abutment portion located at one end of the screw, the abutment portion protrudes from the screw in a radial direction of the screw, the screw is threadedly connected to a portion of the second connector embedded in the cavity, and the abutment portion abuts the second cable against the portion of the second connector embedded in the cavity along the axial direction of the screw.

11. The explosion-proof connector according to claim 1, characterized in that: The first connector includes a first connector body and a first plug-in portion provided on the first connector body, wherein the first plug-in portion is used for electrically conducting with the first cable; The second connector includes a second connector body and a second plug-in portion disposed on the second connector body, the protective shell is detachably connected to the second connector body, and at least a portion of the second connector body is embedded in the cavity to be connected to the second cable and electrically conductive; The first connector body and the second connector body are detachably connected and enclosed to form an explosion-proof cavity. The first plug-in portion and the second plug-in portion are located in the explosion-proof cavity. One of the first plug-in portion and the second plug-in portion is provided with a plug-in slot, and the other is detachably inserted in the plug-in slot, and the first plug-in portion and the second plug-in portion are electrically conductive.

12. The explosion-proof connector according to claim 11, characterized in that: The first connector body includes a first base and a first sleeve, the first sleeve and the first plug-in portion are protrudingly arranged on the same side of the first base along a predetermined direction, and the first sleeve is arranged around the outer periphery of the first plug-in portion; The second connector body comprises a second base, a second sleeve and a connecting portion, wherein the second base is arranged opposite to the first base along the predetermined direction, the second sleeve and the second plug-in portion are convexly arranged on the same side of the second base in the opposite direction of the predetermined direction, the connecting portion is convexly arranged on the other side of the second base along the predetermined direction, embedded in the cavity and used for connecting with the second cable and conducting electricity, and the second sleeve is arranged around the outer periphery of the second plug-in portion; The first sleeve and the second sleeve are sleeved with each other, and the first base, the first sleeve, the second sleeve and the second base are surrounded to form the explosion-proof cavity.

13. The explosion-proof connector according to claim 12, characterized in that: The second joint body further comprises a limiting portion, the limiting portion is arranged outside the second sleeve, and the second sleeve is sleeved inside the first sleeve; The explosion-proof connector also includes: A sealing ring, arranged in an axial direction with the predetermined direction as the ring, and clamped between the end surface of the first sleeve at one end away from the first base and the limiting portion along the predetermined direction; The locking member is respectively sleeved on the outside of the first sleeve and the second sleeve, one end of the locking member along the predetermined direction is threadedly connected to the first sleeve, and the other end is abutted against the limiting portion along the predetermined direction, so that the limiting portion presses against the sealing ring.

14. A magnetic levitation compression machine, characterized in that: Comprising the explosion-proof connector described in any one of claims 1 to 13.

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