Arcing pressure relief device for switch cabinet

Abstract

The utility model relates to an arcing pressure relief device for a switch cabinet. The arcing pressure relief device is provided with an inlet side and an outlet side, and comprises a pressure relief box which is provided with an inner cavity and is provided with a pressure relief opening communicated with the inner cavity on the outlet side; the flow guide assembly is arranged in the inner cavity of the pressure relief box and comprises a support, a flow guide cavity which is open towards the inlet side and has the section gradually shrunk in the direction from the inlet side to the outlet side is defined, and multiple layers of flow guide openings which are distributed in the direction of the inlet side and the outlet side at intervals are formed. Each layer of flow guide opening is communicated with the flow guide cavity; the multiple flow guide plates are arranged in a stacked mode in the direction of the inlet side and the direction of the outlet side and jointly define a zigzag flow guide channel communicating with the flow guide cavity and the pressure relief opening. And a shunting channel aligned with the corresponding flow guide opening in the multiple layers of flow guide openings of the bracket is defined between every two adjacent layers of flow guide plates.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of switch cabinet safety protection, especially relates to a burning arc pressure relief device for switch cabinet. BACKGROUND

[0002] The internal part of the switch cabinet can cause a primary loop short circuit due to insulation aging, human operation failure and other reasons, thereby causing a burning arc failure. Under an ultra-high short circuit current, the burning arc can instantly generate high-temperature and high-pressure gas. If the high-temperature and high-pressure gas cannot be effectively released outside the cabinet body of the switch cabinet in a very short time, the switch cabinet can be burst, or the adjacent equipment can be damaged, and the personal safety can also be injured. In order to avoid the internal burning arc failure causing huge losses of equipment property, personnel casualties and other indirect losses, it is particularly important to effectively improve the pressure relief capacity of the switch cabinet to protect the personal safety of the relevant staff. The known burning arc pressure relief device of the switch cabinet is either simple in structure and needs to be additionally installed with a channel to meet the burning arc pressure relief requirement, or is complex in structure, unreliable in performance, inconvenient to assemble and cannot meet the burning arc requirement.

[0003] Therefore, there is a demand for designing a new internal burning arc pressure relief device in the industry. SUMMARY

[0004] The utility model aims at providing a burning arc pressure relief device for switch cabinet, which can at least solve part of the above technical problems.

[0005] According to one aspect of the utility model, a burning arc pressure relief device for switch cabinet is provided, the burning arc pressure relief device has an inlet side and an outlet side, and the burning arc pressure relief device comprises: a pressure relief box having an inner cavity and forming a pressure relief port communicated with the inner cavity at the outlet side; a flow guide assembly arranged in the inner cavity of the pressure relief box and comprising: a support defining a flow guide cavity open toward the inlet side and gradually tapered in cross section along a direction from the inlet side to the outlet side, and forming a plurality of layers of flow guide ports spaced apart in a direction from the inlet side to the outlet side, wherein each layer of flow guide ports is communicated with the flow guide cavity; a plurality of flow guide plates arranged in layers in a direction from the inlet side to the outlet side and jointly defining a tortuous flow guide channel communicated with the flow guide cavity and the pressure relief port, and a part of the flow guide plates defining a shunt channel aligned with a corresponding flow guide port of the plurality of layers of flow guide ports of the support between adjacent two layers of flow guide plates.

[0006] The burning arc pressure relief device provided by the scheme has the following advantages:

[0007] Safe and reliable: can be quickly opened when a failure arc occurs in the switch cabinet, and effectively release high-temperature and high-pressure gas, thereby protecting the safety of the operating personnel and the equipment.

[0008] Reasonable design: release pressure direction avoids the patrol channel and other equipment, reduces the influence of high temperature and high pressure gas on the surrounding environment.

[0009] Wide range of applications: can be applied to switch cabinets of different depths and widths, with good versatility and flexibility.

[0010] Easy to maintain: simple structure, easy to maintain, and reduce operation and maintenance costs.

[0011] In some embodiments, a portion of the plurality of guide plates has an opening, and this portion of the guide plate is connected to the surface of the support facing away from the guide cavity in a manner that its opening is aligned with one of the multiple layers of guide openings of the support.

[0012] In some embodiments, the support includes a top plate segment and two side plate segments connected at opposite ends of the top plate segment, wherein the distance between the two side plate segments tapers in the direction from the inlet side to the outlet side, and each side plate segment has the multiple layers of guide openings; wherein the top plate segment and the two side plate segments collectively enclose the guide cavity.

[0013] In some embodiments, the two side plate segments are respectively connected with mounting plate segments at the ends away from the top plate segment, and the mounting plate segments are adapted to be directly connected to the cabinet wall where the pressure relief port of the switch cabinet is located.

[0014] In some embodiments, among the plurality of guide plates arranged in a stack in the direction from the inlet side to the outlet side, the guide plate closest to the inlet side is connected to the support and the pressure relief tank at opposite ends respectively, and prevents the gas entering the guide passage from returning through the space between the support and the pressure relief tank.

[0015] In some embodiments, among the plurality of guide plates arranged in a stack in the direction from the inlet side to the outlet side, each of the guide plates other than the guide plate closest to the inlet side is formed with a plurality of guide long holes spaced apart and parallel to each other for gas to flow out.

[0016] In some embodiments, among the guide plates defining the shunt passages, the plurality of guide long holes formed in one of the guide plates and the plurality of guide long holes formed in another of the guide plates are staggered with respect to each other in a direction away from the guide cavity.

[0017] In some embodiments, the plurality of guide long holes exist at the end of each shunt passage.

[0018] In some embodiments, the plurality of elongated flow guide holes of the guide plate closest to the outlet side among the plurality of guide plates are aligned with the pressure relief port of the pressure relief box, and the gas in each diversion channel converges at the guide plate closest to the outlet side and flows through the plurality of elongated flow guide holes thereon to the pressure relief port of the pressure relief box.

[0019] In some embodiments, the pressure relief box includes: a box body having a top wall defining the pressure relief port and a side wall angled to the top wall, the side wall enclosing an inner cavity of the pressure relief box; a cover plate movably connected to the box body and covering the pressure relief port, the cover plate having an opening communicating with the pressure relief port; a filter screen covering the opening of the cover plate; and a pressure plate covering the filter screen and having an opening aligned with the opening of the filter screen.

[0020] Other features and advantages of this invention will partly be apparent to those skilled in the art upon reading this application, and partly will be described below in conjunction with the accompanying drawings in the detailed description. Attached Figure Description

[0021] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings, wherein:

[0022] Figure 1 This is a schematic diagram of an arc-relieving device according to an embodiment of the present invention;

[0023] Figure 2 This is an exploded view of the arc-relieving device according to an embodiment of the present invention;

[0024] Figure 3 This is an exploded view of the pressure relief box according to an embodiment of the present invention;

[0025] Figure 4 This is a side view of the flow guiding component according to an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of a bracket according to an embodiment of the present utility model;

[0027] Figure 6 This is a schematic diagram of the first guide plate according to an embodiment of the present utility model;

[0028] Figure 7 This is a schematic diagram of the second guide plate according to an embodiment of the present invention;

[0029] Figure 8 This is a schematic diagram of the third guide plate according to an embodiment of the present utility model;

[0030] Figure 9 This is a schematic diagram of the fourth guide plate according to an embodiment of the present utility model;

[0031] Figure 10 is a schematic view of a fifth deflector plate according to an embodiment of the present application;

[0032] Figure 11 is a schematic view of a cross section of an arc burning pressure relief device according to an embodiment of the present application.

[0033] Legend of reference signs

[0034] 1 - arc burning pressure relief device; 10 - inlet side; 11 - outlet side; 2 - pressure relief tank; 21 - tank body; 210 - top wall; 212 - pressure relief port; 214 - flange; 211 - side wall; 213 - flange; 214 - inner cavity; 22 - cover plate; 220 - opening; 221 - flange; 222 - hinge; 23 - filter screen; 24 - pressure plate; 240 - opening; 3 - bracket; 30 - top plate section; 31 - side plate section; 32 - deflector port; 32a - first layer deflector port; 32b - second layer deflector port; 32c - third layer deflector port; 33 - bottom plate section; 34 - deflector cavity; 4 - first deflector plate; 40 - bottom plate section; 41 - side plate section; 42 - opening; 43 - flange; 5 - second deflector plate; 50 - bottom plate section; 51 - top plate section; 52 - side plate section; 53 - opening; 54 - flange; 55 - deflector long hole; 56 - side plate section; 6 - third deflector plate; 60 - bottom plate section; 61 - side plate section; 62 - opening; 63 - flange; 64 - deflector long hole; 7 - fourth deflector plate; 70 - top plate section; 71 - side plate section; 72 - deflector long hole; 8 - fifth deflector plate; 80 - middle plate section; 81 - side plate section; 82 - flange; 83 - deflector long hole; 9 - deflector assembly; 91 - first shunt passage; 92 - second shunt passage; 93 - third shunt passage DETAILED DESCRIPTION

[0035] Reference will now be made to the drawings, in which the exemplary embodiments of the disclosed technology will be more particularly described. While the drawings are presented in a manner that illustrates some embodiments of the disclosed technology, the drawings are not necessarily drawn to scale and certain features can be exaggerated, removed, or partially sectioned to better illustrate and explain the disclosed technology. Portions of the devices in the drawings can be adjusted in position according to actual needs without affecting the technical effects. The phrase "in the drawings" or similar language appearing in the specification is not necessarily referring to all of the drawings or examples.

[0036] Certain directional terms used herein for describing the drawings, such as "inner", "outer", "above", "below" and other directional terms, will be understood to have their normal meanings and refer to those directions involved when viewing the drawings normally. Unless otherwise indicated, the directional terms described in the specification are basically in accordance with the conventional directions understood by those skilled in the art.

[0037] The terms “first,” “first,” “second,” “second,” and similar terms used in this utility model do not indicate any order, quantity, or importance, but are used to distinguish one component from other components.

[0038] Figure 1 and Figure 2 An arc-induced pressure relief device 1 is illustrated as an example, which is installed in the cabinet of a switchgear, particularly a high-voltage switchgear. Figure 1 As shown, the arc-induced pressure relief device 1 has an inlet side 10 and an outlet side 11. High-temperature, high-pressure arc-induced gas flow, carrying hot particles, rushes into the arc-induced pressure relief device 1 through the inlet side 10. Within the device, significant energy is consumed, and almost all the hot particles are trapped. The remaining gas is then discharged from the outlet side 11, thus ensuring the safe operation of the switchgear. For clarity, a coordinate system is established with the longitudinal direction of the arc-induced pressure relief device 1 as the x-direction, the transverse direction as the y-direction, and the vertical direction as the z-direction. The following description of the arc-induced pressure relief device 1 is based on this coordinate system. It can be seen that the inlet side 10 and the outlet side 11 are essentially opposite each other along the z-direction.

[0039] Specifically, the arc-induced pressure relief device 1 includes a pressure relief chamber 2 and a flow guiding assembly 9, wherein the flow guiding assembly 9 is installed in the inner cavity 214 of the pressure relief chamber 2. (Reference) Figure 3 The main body or housing 21 of the pressure relief box 2 has a top wall 210 and four side walls 211 connected to the top wall 210 around its perimeter. The side walls 211 are connected to the top wall 210 at an angle, for example, 90 degrees. These side walls 211 together enclose the inner cavity 214 of the pressure relief box 2 for accommodating the flow guiding assembly 9 (see...). Figure 11 Above the inner cavity 214, the top wall 210 forms a pressure relief port 212 communicating with the inner cavity 214, while below the inner cavity 214, the bottom ends of the four side walls 211, away from the top wall 210, enclose openings communicating with the inner cavity 214. Thus, the side where the top wall 210 is located is the outlet side 11 of the arc-relieving pressure relief device 1, and the side where the openings enclosed by the four side walls 211 are located is the inlet side 10 of the arc-relieving pressure relief device 1. In the illustrated embodiment, the pressure relief box 2 may not have a bottom wall.

[0040] At least one pair of opposite side walls, preferably all of the four side walls 211, are connected at a bottom end distal to the top wall 210 with a flange 213 which is at an angle, for example 90 degrees, to the connected side wall and extends in a direction away from the inner cavity 214. A connection member can be passed through the flange 213 and a cabinet of the switchgear, thereby mounting the pressure relief tank 2 to the switchgear. For this purpose, a through hole can be formed in the flange 213 for the connection member such as a bolt or pin to pass through. The top wall 210, the side walls 211 and the flange 213 of the pressure relief tank 2 can be formed as one piece by bending a sheet material.

[0041] The cover plate 22 is connected to the top wall 210 of the pressure relief tank 2 by a hinge 222 and covers the pressure relief port 212. The cover plate 22 can be flipped to open the pressure relief port 212 and can be flipped to close the pressure relief port 212. A plurality of openings 220 are formed in the cover plate 22 which align with and are in communication with the pressure relief port 212. The area of each opening 220 is significantly smaller than the area of the pressure relief port 212. Figure 3 An exemplary embodiment shows fourteen openings 220 arranged in an array. The number and position of the openings 220 can be adjusted as needed. A plurality of openings 220 arranged at intervals and significantly reduced in size can further reduce the energy of the gas discharged from the pressure relief port 212. The flipable cover plate 22 is particularly advantageous when the pressure in the switchgear is large to a certain extent, such as reaching or exceeding a threshold value, because the entire pressure relief port 212 can be exposed to allow the accumulated high pressure in the switchgear to be quickly released, mitigating the risk of explosion.

[0042] The filter screen 23 is attached to the cover plate 22 on a side of the cover plate 22 facing away from the pressure relief tank 2 and covers all of the openings 220. The filter screen 23 can effectively trap hot particles that are discharged with the gas from the pressure relief port 212 and prevent them from escaping to the outside to affect surrounding equipment. A protective pressure plate 24 is arranged on a side of the filter screen 23 facing away from the pressure relief tank 2, such that the filter screen 23 is clamped between the cover plate 22 and the pressure plate 24. The pressure plate 24 can have a plurality of openings 240, and the number and position of the openings 240 of the pressure plate 24 can correspond to the number and position of the openings 220 of the cover plate 22. Through holes can be formed in corresponding positions of the cover plate 22, the filter screen 23 and the pressure plate 24 for a connection member such as a bolt or pin to pass through, so as to fixedly connect the three together. For example, in the embodiment shown, a plurality of connection through holes are formed along the periphery of the cover plate 22, the filter screen 23 and the pressure plate 24, respectively.

[0043] In order to stably mount the filter screen 23 and the pressure plate 24, flanges 221 can be formed at an angle to the periphery of the cover plate 22, which extend in a direction away from the tank 2 and form a groove to accommodate the filter screen 23 and the pressure plate 24. The flanges 221 can be formed by bending the periphery of the cover plate 22 in a direction away from the tank 2.

[0044] Figure 4 to Figure 10 The flow guide assembly 9 is shown accommodated in the inner cavity 214 of the pressure relief tank 2. The flow guide assembly 9 comprises the bracket 3 and a plurality of flow guide plates. These flow guide plates are installed in layers in the direction from the inlet side 10 to the outlet side 11, and are capable of causing the high-temperature and high-pressure gas flow and hot particles rushing into the arc burning pressure relief device 1 from the inlet side 10 to be divided into multiple paths. The divided high-temperature and high-pressure gas flow and hot particles are turned in the zigzag flow guide channels defined by the flow guide assembly 9, which not only lengthens the flow paths of the high-temperature and high-pressure gas flow and hot particles, but also causes them to collide with the flow guide assembly 9, effectively reducing the energy carried by the high-temperature and high-pressure gas flow and hot particles. In addition, the high-temperature and high-pressure gas flow and hot particles of different paths will collide with each other when they converge at a position of the flow guide assembly 9 close to the outlet side 11, further increasing energy consumption.

[0045] The bracket 3 serves as the installation basis of the flow guide plates, and its structure is exemplarily shown in Figure 5 As shown in the figure, one end of the bracket 3 close to the outlet side 11 is narrowed to a certain extent compared to the other end close to the inlet side 10. This trapezoidal structure with a large lower part and a small upper part helps to accommodate more high-temperature and high-pressure gas flow and hot particles in a short time and force them to enter the established divided paths. Specifically, the bracket 3 has a top plate section 30 and two side plate sections 31 connected obliquely on the transversely opposite sides of the top plate section 30. The two side plate sections 31 extend away from each other from the top plate section 30, so that the transverse distance between the two side plate sections 31 gradually increases in the direction away from the top plate section 30, thereby configuring the trapezoidal cross section of the bracket 3. A bottom plate section 33 is connected to the bottom end of each side plate section 31 away from the top plate section 30, which can be parallel to the top plate section 30, and the bottom plate section 33 connected by each side plate section 31 extends away from the other side plate section in the transverse direction y.

[0046] The top plate section 30 and the bottom plate section 33 of the bracket 3 mainly serve as installation plate sections for connection with other flow guide plates or switch cabinets. For example, the bottom plate section 33 can be directly installed on the cabinet body of the switch cabinet through connecting members, so that the arc burning gas flow can directly rush into the flow guide cavity 34 formed between the two side plate sections 31. The top plate section 30 and the bottom plate section 33 can each be formed with a plurality of through holes for the connecting members such as bolts or pins to pass through for installation purposes.

[0047] In addition to defining the flow guide cavity 34, the side plate section 31 can also serve to divide the flow of high-temperature and high-pressure gas flow and hot particles. As shown in the figure, the side plate section 31 is formed with multiple layers of flow guide openings from bottom to top, including a first layer of flow guide openings 32a close to the inlet side 10, a third layer of flow guide openings 32c close to the outlet side 11, and a second layer of flow guide openings 32b therebetween, wherein each layer of flow guide openings is composed of multiple flow guide openings 32 (five are shown in the figure) arranged at intervals in the longitudinal direction x. The layered flow guide openings are used to construct multiple divided channels together with other layers of flow guide plates arranged in layers.

[0048] The length of the bracket 3 in the longitudinal direction x substantially coincides with the size of the inner cavity 214, so that the bracket 3 can abut against the inner surface of the side wall 211 of the tank 21 of the pressure relief tank 2 at both longitudinal ends. In this way, the arcing gas and hot particles are prevented from entering the arcing pressure relief device 1 from the gap between the bracket 3 and the tank 21.

[0049] Figure 6 The first flow guide plate 4 is exemplarily shown. The first flow guide plate 4 is the first layer or bottom layer flow guide plate of all the flow guide plates of the flow guide assembly 9, which is closest to the inlet side 10 in the longitudinal direction x. The length of the first flow guide plate 4 in the longitudinal direction x substantially coincides with the size of the inner cavity 214. A pair of first flow guide plates 4 are arranged on the transversely opposite sides of the bracket 3 respectively, and each first flow guide plate 4 is connected between the bracket 3 and the pressure relief tank 2. The first flow guide plate 4 can include a bottom plate section 40, and side plate sections 41 and a flange 43 which are connected to the transversely opposite sides of the bottom plate section 40 at an angle. The inclination angle of the side plate section 41 with respect to the bottom plate section 40 can substantially coincide with the inclination angle of the side plate section 31 of the bracket 3 with respect to the top plate section 30. The flange 43 can be perpendicular to the bottom plate section 40.

[0050] The side plate section 41 has a plurality of openings 42 which are arranged at intervals in the longitudinal direction x, and the openings 42 correspond to the first layer flow guide openings 32a of the bracket 3. When the first flow guide plate 4 is connected to the bracket 3, the side plate section 41 of the first flow guide plate 4 abuts against the surface of the side plate section 31 of the bracket 3 which faces away from the flow guide cavity 34, and the plurality of openings 42 of the first flow guide plate 4 are aligned with the first layer flow guide openings 32a of the bracket 3 one by one, thereby constituting the inlet of the first (layer) flow guide passage. The side plate section 41 of the first flow guide plate 4 and the side plate section 31 of the bracket 3 can be fastened by a connecting member. The bottom plate section 40 of the first flow guide plate 4 is superposed on the bottom plate section 33 of the bracket 3, and can also be fastened by a connecting member. The flange 43 of the first flow guide plate 4 abuts against the inner surface of the side wall 211 of the tank 21 of the pressure relief tank 2, and can be fixed by a connecting member. In this way, the first flow guide plate 4 is connected between the bracket 3 and the side wall 211 of the tank 21 of the pressure relief tank 2, wherein the bottom plate section 40 of the first flow guide plate 4 extends between the bracket 3 and the side wall 211 of the tank 21 of the pressure relief tank 2, thereby preventing the arcing gas flow and hot particles from entering the arcing pressure relief device 1 from the space outside the flow guide cavity 34, and also preventing the arcing gas flow and hot particles which have entered the arcing pressure relief device 1 from turning back through the space between the bracket 3 and the pressure relief tank 2.

[0051] Figure 7A second baffle 5 is shown. The second baffle 5 is a layer of baffles above the first baffle 4, or called second layer of baffles, which has a length in the longitudinal direction x substantially consistent with the size of the inner cavity 214. A pair of second baffles 5 is arranged on the opposite sides of the holder 3 in the lateral direction, and each of the second baffles 4 can define a first shunt passage 91 together with the first baffle 5 on the same side. Specifically, the lateral opposite sides of the bottom plate segment 50 of the second baffle 5 are respectively connected with two side plate segments 52 and 56 at an angle, wherein the inclination angle of the side plate segment 52 relative to the bottom plate segment 50 is substantially consistent with the inclination angle of the side plate segment 31 of the holder 3 relative to the top plate segment 30. The other side plate segment 56 can be perpendicular to the bottom plate segment 50. Both of the side plate segments 52 and 56 extend away from the first baffle 4. The end of the side plate segment 56 away from the bottom plate segment 50 is connected with a top plate segment 51 at an angle (e.g. 90 degrees). The top plate segment 51 extends laterally from the side plate segment 56 in a direction away from the bottom plate segment 50, and at the extending end away from the side plate segment 56 is connected with a flange 54 at an angle (e.g. 90 degrees), which extends towards the plane where the bottom plate segment 50 is located.

[0052] The side plate segment 52 has a plurality of openings 53 arranged at intervals in the longitudinal direction x, which correspond to the second layer of flow guide openings 32b of the holder 3. When the second baffle 5 is connected to the holder 3, the side plate segment 52 of the second baffle 5 abuts against the surface of the side plate segment 31 of the holder 3 facing away from the flow guide cavity 34, and the plurality of openings 53 of the second baffle 5 are aligned with the second layer of flow guide openings 32b of the holder 3 one by one, thereby configuring the inlet of the second shunt passage. The side plate segment 52 of the second baffle 5 and the side plate segment 31 of the holder 3 can be fastened by a connecting member. The flange 54 of the second baffle 5 abuts against the inner surface of the side wall 211 of the tank body 21 of the pressure relief tank 2, and is arranged above and below the flange 43 of the first baffle 4. The bottom plate segment 50, the side plate segment 56 and the top plate segment 56 of the second baffle 5 are all suspended above the first baffle 4, and together with the bottom plate segment 40 of the first baffle 4 define the first shunt passage 91.

[0053] Reference is made to Figure 2 and Figure 7 The top plate segment 51 of the second baffle 5 is formed with a plurality of flow guide slits 55 arranged at intervals in the longitudinal direction x, wherein each of the flow guide slits 55 extends in the lateral direction y. These flow guide slits 55 are densely arranged on the top plate segment 51 at a large density, which can cut the burning arc and promote the burning arc to extinguish quickly. In addition, the densely arranged plurality of flow guide slits 55 can also effectively intercept the hot particles.

[0054] Since the distance h between the bottom section 50 of the second baffle 5 and the bottom section 40 of the first baffle 4 is smaller than the distance H between the top section 51 of the second baffle 5 and the bottom section 40 of the first baffle 4, for example, h = 1 / 2H, the first shunt passage 91 is relatively narrow near the front end of the holder 3, and relatively wide away from the holder 3. From Figure 2 It can be seen that the flow guide long holes 55 are present at the end of the first shunt passage 91.

[0055] Figure 8 The third baffle 6 is shown. The third baffle 6 is a layer of baffle above the second baffle 5, or referred to as the third layer of baffle, and the length thereof in the longitudinal direction x is substantially consistent with the size of the inner cavity 214. A pair of third baffles 6 are arranged on the transversely opposite sides of the holder 3, and each third baffle 6 can define a second shunt passage 92 together with the second baffle 5 on the same side. Specifically, the transversely opposite ends of the bottom section 60 of the third baffle 6 are respectively connected with the side section 61 and the flange 63 at an angle. The inclination angle of the side section 61 relative to the bottom section 60 is substantially consistent with the inclination angle of the side section 31 of the holder 3 relative to the top section 30. The flange 63 can be perpendicular to the bottom section 60, the side section 61 and the flange 63, and all of them extend in a direction away from the second baffle 5.

[0056] The side section 61 has a plurality of openings 62 arranged at intervals in the longitudinal direction x, which correspond to the third layer of flow guide ports 32c of the holder 3. When the third baffle 6 is connected to the holder 3, the side section 61 of the third baffle 6 is tightly attached to the surface of the side section 31 of the holder 3 facing away from the flow guide cavity 34, and the plurality of openings 62 of the third baffle 6 are aligned with the third layer of flow guide ports 32c of the holder 3 one by one, thereby configuring the inlet of the third shunt passage. The side section 61 of the third baffle 6 and the side section 31 of the holder 3 can be fastened by a connecting member. The bottom section 60 of the third baffle 6 is laid on the top section 51 of the second baffle 5, and can be fastened together with the top section 51 by a connecting member. The flange 63 of the third baffle 6 is spaced apart from the side wall 211 of the tank body 21 of the pressure relief tank 2, and the plurality of flow guide long holes 55 of the second baffle 5 are located in the space.

[0057] Referring to Figure 2 and Figure 8 , the bottom section 60 of the third baffle 6 is formed with a plurality of flow guide long holes 64 arranged at intervals in the longitudinal direction x, wherein each flow guide long hole 64 extends in the transverse direction y. These flow guide long holes 64 are densely arranged on the bottom section 60 at a large density, which can play a role in cutting the arc, and promote the arc to be extinguished quickly. In addition, the densely arranged plurality of flow guide long holes 64 can also effectively intercept the hot particles. The flow guide long holes 64 of the third baffle 6 are located at the end of the second shunt passage 92.

[0058] Figure 9 A fourth baffle 7 is shown. The fourth baffle 7 is a layer above the third baffle 6, or a fourth layer baffle, and has a length in the longitudinal direction x substantially the same as the size of the inner cavity 214. The fourth baffle 7 is connected to the bracket 3, and the fourth baffle 7 extends from the opposite sides of the bracket 3 in the lateral direction y to define, together with the third baffle 6 on the same side, a third shunt passage 93. Specifically, the lateral opposite ends of the top plate segment 70 of the fourth baffle 7 are respectively connected with a side plate segment 71 at an angle. The side plate segment 71 can be connected to the top plate segment 70 perpendicularly. The substantially middle portion of the top plate segment 70 of the fourth baffle 7 is connected to the top plate segment 30 of the bracket 3 by a connecting member, and the lateral opposite ends of the top plate segment 70 extend from the opposite sides of the bracket 3. The side plate segment 71 on each side extends from the end of the top plate segment 70 towards the third baffle 6, and is supported on the bottom plate segment 60 of the third baffle 6 between the side plate segment 61 and the baffle long hole 64 of the third baffle 6.

[0059] The lateral opposite sides of the fourth baffle 7 are each formed with a set of baffle long holes 72, and the baffle long holes 72 in each set are arranged in the longitudinal direction x. Each baffle long hole 72 extends in the lateral direction y to the top plate segment 70 and the side plate segment 71. The baffle long holes 72 in each set are densely arranged on the fourth baffle 7 at a high density, which can cut the arc and promote the arc to extinguish quickly. In addition, the densely arranged baffle long holes 72 can effectively intercept the hot particles. The baffle long holes 72 are present at the end of the third shunt passage 93. In addition, the baffle long holes 72 of the fourth baffle 7, the baffle long holes 64 of the third baffle 6 and the baffle long holes 55 of the second baffle 5 are staggered in the lateral direction y, and the baffle long holes 55 of the second baffle 5 are closest to the side wall 211 of the tank body 21 of the pressure relief tank 2, the baffle long holes 72 of the fourth baffle 7 are closest to the bracket 3, and the baffle long holes 64 of the third baffle 6 are between the two.

[0060] Figure 10 A fifth baffle 8 is shown. The fifth baffle 8 is a layer above the fourth baffle 6, or a fifth layer baffle, and has a length in the longitudinal direction x substantially the same as the size of the inner cavity 214. A pair of fifth baffles 8 are oppositely arranged above the fourth baffle 6 and located on the lateral opposite sides of the top plate segment 30 of the bracket 3. The arc gas and hot particles flowing out of the three shunt passages 91, 92, 93 and converging flow through the fifth baffle 8 to the pressure relief port 212. Specifically, the lateral opposite ends of the middle plate segment 80 of the fifth baffle 8 are respectively connected with a side plate segment 81 and a flange 82 at an angle, wherein the side plate segment 81 extends towards the fourth baffle 7, and the flange 82 extends away from the fourth baffle 7. The side plate segment 81 and the middle plate segment 80 can form an obtuse angle, and the flange 82 can be perpendicular to the middle plate segment 80.

[0061] To install the fifth flow guide plate 8, the top wall 210 of the tank body 21 of the pressure relief tank 2 can be formed with a pair of opposite flanges 214 along the periphery of the pressure relief port 212. The flange 82 of the fifth flow guide plate 8 is tightly attached to the flange 214 of the top wall 210 of the tank body 21, and is fastened together by a connecting piece, thereby connecting the fifth flow guide plate 8 to the top wall 210 of the tank body 21. The plurality of flow guide long holes 83 of the fifth flow guide plate 8 are arranged in the longitudinal direction x, and each flow guide long hole 83 extends in the lateral direction y to the side plate segment 81 and the middle plate segment 80. These flow guide long holes 83 are densely arranged on the fifth flow guide plate 8 with a large density, which can cut the arc and promote the arc to extinguish quickly. In addition, the densely arranged plurality of flow guide long holes 83 can also effectively intercept the hot particles.

[0062] The working principle of the arc pressure relief device 1 of the utility model will be described in detail below. Figure 11 The working principle of the arc pressure relief device 1 of the utility model will be described in detail below.

[0063] As shown in the figure, five layers of flow guide plates are arranged and connected between the support 3 and the tank body 21 of the pressure relief tank 2 in the opposite direction of the inlet side 10 and the outlet side 11. The plate segments and flanges of each flow guide plate mentioned above can be formed by bending an integral plate. These flow guide plates enclose a zigzag flow guide channel through their bending structure, which includes three shunt channels at the front end of the flow guide channel, and a merging channel at the end of the flow guide channel.

[0064] As Figure 11 As shown by the arrows, the high-temperature and high-pressure gas and hot particles generated by the arc are directly injected into the flow guide cavity 34 and are shunted by the three shunt channels 91, 92, and 93. The high-temperature and high-pressure gas and hot particles entering the first shunt channel 91 first pass through the relatively narrow channel front end, then enter the relatively wide channel end, and then turn upward and flow out of the flow guide long hole 55 of the second flow guide plate 5. The high-speed gas and particle flow collides with the flange 54 of the first flow guide plate 5 and the flange 63 of the second flow guide plate 6 at the end of the shunt channel, thereby dissipating a large amount of energy. The high-temperature and high-pressure gas and hot particles entering the second shunt channel 92 will turn upward after colliding with the side plate segment 56 of the second flow guide plate 5 and flow out of the flow guide long hole 64 of the third flow guide plate 6. Similarly, the high-temperature and high-pressure gas and hot particles entering the third shunt channel 93 will turn upward after colliding with the side plate segment 71 of the fourth flow guide plate 7 and flow out of the flow guide long hole 72 of the fourth flow guide plate 7.

[0065] The gas flow and particle flow from each diversion channel converge on the side of the fifth diversion channel 8 facing the fourth diversion channel 7, and flow through the diversion long hole 83 of the fifth diversion channel 8 to the pressure relief port 212. Finally, the gas flow and particle flow (if any remains) are discharged through the filter screen 23 of the pressure relief tank 2. At this time, the high-temperature and high-pressure gas generated by the arc has been greatly reduced in energy, and the hot particles are almost all trapped in the pressure relief tank 2 and will not affect the surrounding equipment.

[0066] It should be understood that although the present specification is described in terms of various embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

[0067] The above description is only a specific embodiment of the present application, and is not intended to limit the scope of the present application. Any equivalent changes, modifications and combinations made by those skilled in the art without departing from the concept and principles of the present application shall fall within the scope of the present application.

Claims

1. An arc flash pressure relief device for an electrical switchgear cabinet, the arc flash pressure relief device having an inlet side and an outlet side, characterized in that, The arc burning pressure relief device comprises: a pressure relief tank having an inner cavity and forming a pressure relief port communicating with the inner cavity at the outlet side; a flow guide assembly arranged in the inner cavity of the pressure relief tank and comprising: a support defining a flow guide cavity open toward the inlet side and tapering in cross section along a direction from the inlet side to the outlet side, and forming a plurality of layers of flow guide ports spaced apart in a direction from the inlet side to the outlet side, wherein each layer of flow guide ports communicates with the flow guide cavity; a plurality of flow guide plates arranged in layers in a direction from the inlet side to the outlet side and collectively defining a tortuous flow guide passage communicating the flow guide cavity and the pressure relief port, wherein a portion of the flow guide plates define a shunt passage between adjacent two layers of flow guide plates in alignment with a corresponding flow guide port of the plurality of layers of flow guide ports of the support.

2. The arc flash pressure relief device for an electrical switchgear of claim 1, wherein, A portion of the plurality of flow guide plates have openings, and are connected to a surface of the support facing away from the flow guide cavity in a manner that the openings thereof are aligned with a layer of flow guide ports of the plurality of layers of flow guide ports of the support.

3. The arc flash pressure relief device for an electrical switchgear cabinet of claim 1, wherein, The support comprises a top plate segment and two side plate segments connected at opposite ends of the top plate segment, wherein a distance between the two side plate segments tapers along a direction from the inlet side to the outlet side, and each side plate segment has the plurality of layers of flow guide ports; wherein the top plate segment and the two side plate segments collectively enclose the flow guide cavity.

4. The arc flash pressure relief device for an electrical switchgear according to claim 3, wherein The two side plate segments are respectively angularly connected at end portions distal from the top plate segment with mounting plate segments adapted to be directly connected to a cabinet wall where a pressure relief port of the switch cabinet is located.

5. The arc flash pressure relief device for an electrical switchgear of claim 1, wherein, Among the plurality of flow guide plates arranged in layers in a direction from the inlet side to the outlet side, a flow guide plate closest to the inlet side is connected to the support and the pressure relief tank at opposite ends respectively, and prevents gas entering the flow guide passage from returning through a space between the support and the pressure relief tank.

6. The arc fault pressure relief device for an electrical switchgear according to claim 1, characterized in that, Among the plurality of flow guide plates arranged in layers in a direction from the inlet side to the outlet side, except for the flow guide plate closest to the inlet side, other flow guide plates each form a plurality of flow guide slits spaced apart and parallel to each other for gas to flow out.

7. The arc fault pressure relief device for an electrical switchgear according to claim 6, characterized in that, Among the flow guide plates defining shunt passages, the plurality of flow guide slits formed in one of the flow guide plates are staggered with the plurality of flow guide slits formed in another of the flow guide plates in a direction away from the flow guide cavity.

8. Arcing pressure relief device for a switchgear cabinet according to claim 6 or 7, characterized in that The plurality of flow guide slits exist at terminal ends of each shunt passage.

9. The arc burning pressure relief device for a switchgear according to claim 6 or 7, characterized by, The plurality of flow guide slits of the flow guide plate closest to the outlet side among the plurality of flow guide plates are aligned with the pressure relief port of the pressure relief tank, and gas in each shunt passage converges at the flow guide plate closest to the outlet side and flows through the plurality of flow guide slits thereof to the pressure relief port of the pressure relief tank.

10. The arc flash pressure relief device for an electrical switchgear of claim 1, wherein, The pressure relief tank comprises: a tank body having a top wall defining the pressure relief port and a side wall angularly connected to the top wall, the side wall enclosing an inner cavity of the pressure relief tank; a cover plate movably connected to the tank body and covering the pressure relief port, the cover plate having an opening communicating with the pressure relief port; a filter screen covering the opening of the cover plate; a pressing plate covering the filter screen and having an opening aligned with the opening of the filter screen.

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