An explosion-proof high-voltage cable branch box

Abstract

The utility model provides a kind of anti-explosion high-voltage cable branch box, including explosion-proof box, it includes inner layer box, outer layer box, cabinet door, reinforcing connecting piece, cable interface, silicon rubber cylinder, grounding structure, pressure relief port, pressure relief passage, elastic pressure relief shield piece;Arc generated in box is guided into ground in time using grounding structure, reduce the explosion problem caused by arc;When internal explosion occurs accidentally, explosion opens the movable part of the elastic pressure relief shield piece blocked outside the pressure relief passage to relieve pressure, reduce the impact of impact on explosion-proof box;The explosion-proof box formed by the reinforcing connecting piece between the inner layer box and the outer layer box has strong mechanical strength, better resist the residual explosion impact force after pressure relief, avoid the danger of device damage explosion.

Description

Technical Field

[0001] This utility model relates to the field of branch box technology, and in particular to an explosion-proof high-voltage cable branch box. Background Technology

[0002] The descriptions in this section provide background information relating to this disclosure and do not constitute prior art.

[0003] Cable branch boxes are used as cable branches. Their main function is to split or transfer cables. They can serve as cable splitters and transferrs. High-voltage cable branch boxes, due to their relatively enclosed environment, may experience excessive internal pressure and thus pose a risk of explosion in the event of a short circuit or other problems. Alternatively, in areas with excessive dust, electric arcs may easily occur inside the box, leading to a dust explosion.

[0004] The existing high-voltage cable branch box casings are not explosion-proof enough. In the event of an explosion, they cannot discharge the impact pressure in time and are unable to withstand the explosive impact caused by the internal electric arc, resulting in equipment damage and explosion, which is highly dangerous. Utility Model Content

[0005] The purpose of this utility model is to provide an explosion-proof high-voltage cable branch box, which has the advantages of pressure relief to reduce the impact of impact force on the explosion-proof box and improve the mechanical strength of the explosion-proof box. It solves the technical problem that the existing high-voltage cable branch box shell has insufficient explosion-proof capability, cannot discharge the impact pressure in time when an explosion occurs, and is difficult to resist the explosion impact caused by internal electric arc, resulting in equipment damage and explosion.

[0006] This utility model provides an explosion-proof high-voltage cable branch box, comprising:

[0007] Explosion-proof boxes, which include:

[0008] The inner box is coaxially fitted with the outer box on its outer wall;

[0009] The inner and outer cabinets are respectively provided with cabinet doors on their front walls, and the size of the inner cabinet door is smaller than that of the outer cabinet door.

[0010] A reinforcing connector is fixedly connected between the inner wall of the outer box and the outer wall of the inner box at their corners;

[0011] The explosion-proof box has a cable interface at the lower end, and a silicone rubber tube is embedded inside it.

[0012] The explosion-proof box is equipped with a grounding structure at its lower end;

[0013] The explosion-proof box has a pressure relief port on its side wall, and a pressure relief channel is sealed and embedded inside it.

[0014] The explosion-proof box is fixedly equipped with an elastic pressure relief shield on the side wall corresponding to the pressure relief port, and its movable part is blocked on the outside of the pressure relief port.

[0015] As a further optimization, in order to seal and shield the pressure relief port under normal conditions, and in the event of an explosion, allow the explosion pressure to overcome the spring force and lift the baffle, enabling rapid pressure relief through the pressure relief channel and reducing the impact intensity on the device during the explosion, the elastic pressure relief shield includes:

[0016] There are two screws, which are respectively vertically fixed to the upper and lower edges of the outer side of the pressure relief port;

[0017] The baffle has reserved through holes on its left and right side walls corresponding to the upper and lower screws, and the screws are slidably inserted into the reserved through holes.

[0018] The baffle is the movable part of an elastic pressure relief shield;

[0019] The outer wall of the screw is fitted with a spring and a metal washer from the inside to the outside;

[0020] The outer end of the outer wall of the screw is screwed with a metal washer that abuts against the outer side of the metal washer.

[0021] A sealing ring is embedded in the inner edge of the baffle.

[0022] As a further optimization, in order to connect the metal washers on the outer walls of the upper and lower screws and ensure that the springs on both sides are compressed by the nuts to the same degree, a connecting rod is fixedly assembled between the metal washers on the outer walls of the upper and lower screws.

[0023] As a further optimization, to improve the insulation of the inner wall of the inner casing, the inner casing includes:

[0024] The inner stainless steel shell has an insulating layer sprayed on its inner wall.

[0025] As a further optimization, to give the outer casing better UV resistance, rigidity, wear resistance, heat insulation, chemical corrosion resistance, and electrical insulation, the outer casing includes:

[0026] The outer shell is made of stainless steel, and its outer wall is covered with a layer of weather-resistant engineering plastic.

[0027] As a further optimization, in order to reduce the impact of high external temperatures on the internal components of the device through an air layer, an air gap cavity is formed between the inner wall of the outer casing and the outer wall of the inner casing.

[0028] As a further optimization, to connect the grounding portion of the cable head at the cable interface to the inner grounding bolt of the power distribution device using independent connecting wires, and to connect the outer grounding bolt to the grounding busbar via connecting wires, thereby achieving grounding protection for the device, the grounding structure includes:

[0029] The internal grounding bolt is screwed into the inner wall of the inner box.

[0030] External grounding bolts are screwed onto the bottom surface of the outer casing.

[0031] A wire is connected between the inner grounding bolt and the outer grounding bolt, and the wire passes through the reserved through holes on the bottom surface of the inner and outer boxes.

[0032] As a further optimization, in order to weld the outer and inner casings and form an air gap between them, the L-shaped steel plate, after the perforation is made, still has sufficient mechanical strength to be used as a connector, reducing material usage and lightening the weight of the components. The reinforcing connector includes:

[0033] L-shaped steel plates are welded and fixed between the inner wall of the outer box and the corner of the outer wall of the inner box.

[0034] The L-shaped steel plate has evenly spaced perforations on its front and rear side walls.

[0035] As a further optimization, a rain shield is fixedly installed on the upper part of the explosion-proof box to provide rain protection.

[0036] As a further optimization, in order to expand the air intake area and achieve faster pressure relief without changing the outlet size of the pressure relief port, the pressure relief channel includes:

[0037] A conical bucket, with a connecting pipe fixedly connected to its outer end;

[0038] Both the conical hopper and the outer wall of the connecting pipe are fitted with sealing rings.

[0039] The shape of the pressure relief port matches the shape of the conical bucket and the connecting pipe.

[0040] This utility model provides an explosion-proof high-voltage cable branch box with the following improvements and advantages compared with the prior art:

[0041] The grounding structure promptly directs any electric arc generated inside the enclosure to the ground, reducing the risk of explosions caused by the arc. In the event of an internal explosion, the movable part of the elastic pressure relief shield, which blocks the outer end of the pressure relief channel, releases pressure, reducing the impact force on the explosion-proof enclosure. The explosion-proof enclosure, consisting of the inner and outer enclosures and the reinforced connecting parts between them, has strong mechanical strength, better resisting the residual explosive impact force after pressure relief and avoiding the danger of device damage and explosion. Attached Figure Description

[0042] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the structure of this utility model;

[0044] Figure 2 This is a schematic cross-sectional view of the explosion-proof box structure of this utility model;

[0045] Figure 3 This is a schematic diagram of the elastic pressure relief shield of this utility model;

[0046] Figure 4 This is a schematic cross-sectional view of a partial structure of the explosion-proof box of this utility model;

[0047] Figure 5 This utility model Figure 2 Enlarged structural diagram at point A in the middle.

[0048] Explanation of reference numerals in the attached figures:

[0049] 1-Explosion-proof box, 11-Inner stainless steel shell, 12-Outer stainless steel shell, 13-Air gap cavity, 14-Insulation layer, 15-Weather-resistant engineering plastic layer, 2-Rain shield, 3-Silicone rubber cylinder, 4-Elastic pressure relief shield, 41-Baffle, 42-Screw, 43-Spring, 44-Metal washer, 45-Nut, 5-Pressure relief channel, 51-Connecting pipe, 52-Conical bucket, 6-Reinforcing connector, 61-L-shaped steel plate, 62-Hollow hole, 7-Grounding structure, 71-Inner grounding bolt, 72-Outer grounding bolt, 73-Wire, 8-Connecting rod. Detailed Implementation

[0050] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0051] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0052] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0053] Please see Figure 1-5 This utility model provides a technical solution: an explosion-proof high-voltage cable branch box, comprising:

[0054] Explosion-proof box 1, which includes:

[0055] The inner box is coaxially fitted with the outer box on its outer wall;

[0056] The inner and outer cabinets have corresponding cabinet doors on their front walls, and the inner cabinet door is smaller than the outer cabinet door.

[0057] A reinforcing connector 6 is fixedly connected between the inner wall of the outer box and the outer wall of the inner box at the corners;

[0058] The explosion-proof box 1 has a cable interface at the lower end, and a silicone rubber cylinder 3 is embedded inside it;

[0059] The explosion-proof box 1 is equipped with a grounding structure 7 at the lower end;

[0060] The explosion-proof box 1 has a pressure relief port on its side wall, and a pressure relief channel 5 is sealed and embedded inside it;

[0061] The explosion-proof box 1 has an elastic pressure relief shield 4 fixedly installed on the side wall corresponding to the pressure relief port, and its movable part is sealed on the outside of the pressure relief port.

[0062] Specifically in this embodiment, the inner and outer boxes are fitted together, and the corners between them are welded with reinforcing connectors 6 for fixation. The front walls of the inner and outer boxes are provided with cabinet doors, with the outer cabinet door being larger. The inner cabinet door is opened after the outer cabinet door is opened.

[0063] The inner and outer boxes are made of stainless steel plates, and sealing rings are installed at the joints to ensure airtightness.

[0064] Furthermore, the grounding structure 7 is used to promptly conduct the electric arc generated inside the box into the ground, reducing the risk of explosion caused by the electric arc; in the event of an accidental internal explosion, the movable part of the elastic pressure relief shield 4, which is blocked at the outer end of the pressure relief channel 5, is opened to release pressure, reducing the impact force on the explosion-proof box 1; the explosion-proof box 1, which is composed of the inner box and the outer box and the reinforcing connector 6 between them, has strong mechanical strength and can better resist the remaining explosive impact force after pressure relief;

[0065] More specifically, the explosion-proof box 1 has cable inlet and outlet through a cable interface. A silicone rubber cylinder 3 is installed inside the cable interface. The inlet and outlet cables pass through the silicone rubber cylinder 3, and the gap between the cable and the inner wall of the silicone rubber cylinder 3 is sealed with epoxy resin sealant.

[0066] Understandably, the pressure relief vent is positioned facing the wall to avoid injury to people during pressure relief. This device is also not suitable for use in flammable or explosive environments.

[0067] In some embodiments, the resilient pressure relief shield 4 includes:

[0068] There are two screws 42, which are vertically fixed to the upper and lower edges of the outer side of the pressure relief port, respectively.

[0069] The baffle 41 has reserved through holes on its left and right side walls corresponding to the upper and lower screws 42, and the screws 42 are slidably inserted into the corresponding reserved through holes;

[0070] Baffle 41 is the movable part of the elastic pressure relief shield 4;

[0071] A spring 43 and a metal washer 44 are sequentially fitted onto the outer wall of the screw 42 from the inside to the outside.

[0072] A nut 45 is screwed onto the outer end of the outer wall of the screw 42, and it abuts against the outer side of the metal washer 44.

[0073] A sealing ring is embedded in the inner edge of the baffle 41.

[0074] Specifically in this embodiment, the spring 43 is pre-tightened by the nut 45, and the pre-tightened spring 43 presses the baffle 41 to fit against the outside of the pressure relief port to block and shield it.

[0075] Furthermore, there are two screws 42 distributed vertically and fixed at the upper and lower edges of the outer side of the pressure relief port. The springs 43 on the outer wall of the screws 42 are pre-tightened by the nut 45. The pre-tightened springs 43 press the baffle 41, and the upper and lower springs 43 press the baffle 41 to ensure the stability of the baffle 41 in blocking the pressure relief port.

[0076] More specifically, the metal washer 44 allows the nut 45 to better abut against the end of the spring 43, and the sealing ring at the inner edge of the baffle 41 ensures the sealing of the pressure relief port.

[0077] In some embodiments, a connecting rod 8 is fixedly assembled between the metal washers 44 on the outer walls of the upper and lower screws 42.

[0078] Specifically in this embodiment, after long-term use, the elasticity of the spring 43 will decrease due to mechanical fatigue. At this time, the compression force on the baffle 41 can be restored by tightening the nut 45 to compress the spring 43.

[0079] Furthermore, the connecting rod 8 connects to the metal washer 44 on the outer wall of the upper and lower screws 42, making the upper and lower metal washers 44 and the connecting rod 8 a whole. The inner ring surface of the metal washer 44 slides and fits against the outer wall of the screw 42, preventing the metal washer 44 from tilting during sliding. This ensures that the upper and lower springs 43 are squeezed by the nut 45 to the same degree, and prevents the upper and lower sides of the baffle 41 from being squeezed and sealed against the outer wall of the pressure relief port with different forces, thus ensuring the stability of the baffle 41 in sealing and blocking the pressure relief port.

[0080] In some embodiments, the inner housing includes:

[0081] The inner stainless steel shell 11 has an insulating layer 14 sprayed on its inner wall. The insulating layer 14 is specifically thermosetting plastic. The spraying forms a thermosetting plastic protective film, which makes the inner wall of the inner box have better insulation, and at the same time improves the wear resistance and corrosion resistance of the inner wall of the inner box.

[0082] In some embodiments, the outer housing includes:

[0083] The outer stainless steel shell 12 is covered with a weather-resistant engineering plastic layer 15. The weather-resistant engineering plastic layer 15 is specifically one of ABS, PC, or ASA, which gives the outer shell wall better UV resistance, rigidity, wear resistance, heat insulation, chemical corrosion resistance, and electrical insulation.

[0084] In some embodiments, an air gap cavity 13 is formed between the inner wall of the outer casing and the outer wall of the inner casing, and the air layer in the air gap cavity 13 reduces the impact of external high temperature on the internal components of the device.

[0085] In some embodiments, the grounding structure 7 includes:

[0086] The inner grounding bolt 71 is screwed to the inner wall of the inner box.

[0087] External grounding bolt 72 is screwed to the bottom surface of the outer casing;

[0088] A wire 73 is connected between the inner grounding bolt 71 and the outer grounding bolt 72, and the wire 73 passes through the reserved through holes on the bottom surface of the inner and outer boxes.

[0089] Specifically, in this embodiment, the grounding part of the cable head of the cable interface is connected to the inner grounding bolt 71 of the power distribution device with an independent connecting wire, and the outer grounding bolt 72 is connected to the grounding busbar through a connecting wire. The connecting wire 73 between the inner grounding bolt 71 and the outer grounding bolt 72 conducts electricity, thereby realizing the grounding protection of the device.

[0090] Furthermore, a rubber layer is pasted on the inner wall of the reserved through hole through the conductor 73, and the rubber layer wraps around the outer wall of the conductor 73.

[0091] In some embodiments, the reinforcing connector 6 includes:

[0092] L-shaped steel plate 61 is welded and fixed between the inner wall of the outer box and the corner of the outer wall of the inner box.

[0093] The L-shaped steel plate 61 has evenly spaced perforated holes 62 on its front and rear side walls.

[0094] Specifically in this embodiment, the reinforcing connector 6 is welded to the outer box and the inner box, and an air gap cavity is formed between them. During assembly, the reinforcing connector 6 is welded first and then the left and right stainless steel plates of the outer box are assembled.

[0095] Furthermore, after the perforation 62 is opened, the mechanical strength of the L-shaped steel plate 61 is still sufficient for use as a connector, reducing material usage and lightening the weight of the parts.

[0096] In some embodiments, a rain shield 2 is fixedly mounted on the upper end of the explosion-proof box 1. The edge of the rain shield 2 extends out of the top surface of the upper end of the explosion-proof box 1 to guide rainwater outward and provide rain protection.

[0097] In some embodiments, the pressure relief channel 5 includes:

[0098] A conical bucket 52, with a connecting pipe 51 fixedly connected to its outer end;

[0099] Both the conical hopper 52 and the connecting pipe 51 have sealing rings embedded in their outer walls.

[0100] The shape of the pressure relief port matches the shape of the conical bucket 52 and the connecting pipe 51.

[0101] Understandably, without changing the outlet size of the pressure relief port, the intake area can be increased by using the conical hopper 52 to achieve faster pressure relief.

[0102] Furthermore, the reason for setting up pressure relief channel 5 instead of using pressure relief port for direct pressure relief is to avoid the released airflow entering the air gap cavity between the outer and inner housings, which would affect the pressure relief effect.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the 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 or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An explosion-proof high-voltage cable branch box, characterized in that, include: Explosion-proof box (1), comprising: The inner box is coaxially fitted with the outer box on its outer wall; The inner and outer cabinets are respectively provided with cabinet doors on their front walls, and the size of the inner cabinet door is smaller than that of the outer cabinet door. A reinforcing connector (6) is fixedly connected between the inner wall of the outer box and the outer wall of the inner box at the corners; The explosion-proof box (1) has a cable interface at the lower end, and a silicone rubber cylinder (3) is embedded inside it; The explosion-proof box (1) is equipped with a grounding structure (7) at its lower end; The explosion-proof box (1) has a pressure relief port on its side wall, and a pressure relief channel (5) is sealed and embedded inside it; The explosion-proof box (1) has an elastic pressure relief shield (4) fixedly installed on the side wall corresponding to the pressure relief port, and its movable part is sealed on the outside of the pressure relief port.

2. The explosion-proof high-voltage cable branch box according to claim 1, characterized in that, The elastic pressure relief shield (4) includes: There are two screws (42), and the two screws (42) are respectively fixed vertically at the upper and lower edges of the outer side of the pressure relief port; The baffle (41) has reserved through holes on its left and right side walls corresponding to the upper and lower screws (42), and the screws (42) are slidably inserted into the reserved through holes. The baffle (41) is the movable part of the elastic pressure relief shield (4); The outer wall of the screw (42) is fitted with a spring (43) and a metal washer (44) from the inside to the outside; A nut (45) is screwed onto the outer end of the outer wall of the screw (42), which abuts against the outer side of the metal washer (44); A sealing ring is embedded at the inner edge of the baffle (41).

3. The explosion-proof high-voltage cable branch box according to claim 2, characterized in that, A connecting rod (8) is fixedly assembled between the metal washers (44) on the outer walls of the upper and lower screws (42).

4. The explosion-proof high-voltage cable branch box according to claim 1, characterized in that, The inner casing includes: The inner stainless steel shell (11) has an insulating layer (14) sprayed on its inner wall.

5. The explosion-proof high-voltage cable branch box according to claim 1, characterized in that, The outer casing includes: The outer stainless steel shell (12) is covered with a weather-resistant engineering plastic layer (15).

6. The explosion-proof high-voltage cable branch box according to claim 1, characterized in that, An air gap cavity (13) is formed between the inner wall of the outer box and the outer wall of the inner box.

7. The explosion-proof high-voltage cable branch box according to claim 1, characterized in that, The grounding structure (7) includes: An internal grounding bolt (71) is screwed to the inner wall of the inner casing; External grounding bolt (72) is screwed to the bottom surface of the outer casing; A wire (73) is connected between the inner grounding bolt (71) and the outer grounding bolt (72), and the wire (73) passes through the reserved through holes on the bottom surface of the inner and outer boxes.

8. The explosion-proof high-voltage cable branch box according to claim 1, characterized in that, The reinforcing connector (6) includes: L-shaped steel plate (61) is welded and fixed between the inner wall of the outer box and the corner of the outer wall of the inner box. The L-shaped steel plate (61) has evenly spaced perforated holes (62) on its front and rear side walls.

9. The explosion-proof high-voltage cable branch box according to claim 1, characterized in that, The explosion-proof box (1) is fixedly equipped with a rain shield (2) at the upper end.

10. The explosion-proof high-voltage cable branch box according to claim 1, characterized in that, The pressure relief channel (5) includes: A conical bucket (52) has a connecting pipe (51) fixedly connected to its outer end; Both the conical bucket (52) and the connecting pipe (51) have sealing rings embedded in their outer walls; The shape of the pressure relief port matches the shape of the conical bucket (52) and the connecting pipe (51).

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