An explosion-proof fire sprinkler for UHV converter transformer fires

Abstract

The present invention provides an explosion-proof fire sprinkler for UHV converter transformer fires, which includes a fire pipeline nested in an explosion-proof pipe. A sprinkler head facing the converter transformer is fixedly screwed on the fire pipeline, and the installation position of the sprinkler head is hidden inside the explosion-proof pipe. The advantages of the explosion-proof fire sprinkler for UHV converter transformer fires provided by the present invention are as follows: by hiding the installation position of the sprinkler head inside the explosion-proof pipe, it can prevent the damage of the installation position of the sprinkler head during an explosion, and the fire pipeline is protected by the explosion-proof pipe and will not be damaged by the explosion, ensuring that the position of the sprinkler head and the connecting branch pipe after the explosion will not change due to explosion shock and high-temperature deformation, and will not affect the envelope of the fire extinguishing area by the fire protection system.

Description

Technical Field

[0001] The present invention relates to the technical field of fire-fighting facilities for UHV substations, and particularly to an explosion-proof fire-fighting sprinkler for UHV converter transformer fires. Background Art

[0002] In long-distance power transmission, UHV DC transmission technology has been widely implemented in engineering applications because it has the characteristics of large transmission capacity, long transmission distance, and low transmission loss compared with UHV AC transmission technology. However, in UHV power transmission, a converter substation needs to be configured for DC-AC conversion; the construction and operation costs of converter substations are much higher than those of UHV AC substations with the same voltage level and transmission capacity. During the operation of the converter transformer, it is filled with hundreds of tons of combustible transformer oil. If a fault occurs inside the converter transformer, the converter transformer will physically explode under the action of a fault arc, and at the same time, a large amount of combustible gas will be generated from the transformer oil. The combustible gas and transformer oil will spray out from the weak parts / gaps of the converter transformer. When the concentration of the combustible gas and transformer oil in the air reaches the explosion limit, a chemical explosion will occur and be accompanied by the overflow and combustion of the transformer oil, thus causing the fire to spread.

[0003] The current fixed fire-fighting system includes a fire-fighting pipeline and sprinklers arranged on the fire-fighting pipeline. The fire-fighting pipeline is arranged outside the BOX-IN (noise reduction device) of the converter transformer or is arranged closely against the firewall and valve hall together with the BOX-IN. The sprinklers are arranged facing the converter transformer. When the fire-fighting pipeline is arranged outside the BOX-IN, when a fire occurs in the converter transformer, the structure of the BOX-IN will fuse and collapse, thereby exposing the internal converter transformer and related structures to the action range of the fire-fighting system for fire-fighting operations. For example, the BOX-IN device with both sound insulation and fire-fighting modules disclosed in the patent application with the publication number CN110180109A conducts fire-fighting operations by arranging a fire-fighting system with different fire-fighting media outside the BOX-IN.

[0004] However, when the bushing, bushing riser, tap changer, oil tank body and other parts explode and catch fire, the bushing, riser and BOX-IN and other facilities will be blown up. The blown-up parts and the explosion shock wave will also damage the nearby fire sprinklers, which will cause the entire fixed fire extinguishing system to fail. Failure to extinguish the fire in time will bring great safety hazards and economic losses. The main reasons are: (1) The destroyed water spray sprinklers, foam spray sprinklers, etc. will directly fail. (2) The damage of some sprinklers will affect the spray effect or foaming ability of other remaining sprinklers. The fire-fighting medium may leak from here, wasting a large amount of fire-fighting water or foam mixture, causing the fire-fighting system to lose pressure as a whole and unable to work normally. (3) The high temperature of the fire causes the fire branch pipe to deform and cannot cover the target area of ​​​​fire extinguishing, resulting in fire extinguishing failure. Overflow fire will also occur at the gaps in the converter transformer body caused by the explosion of the above parts. If the fire sprinklers corresponding to these parts are damaged in the explosion, the difficulty of fire fighting will be greatly increased.

[0005] In order to improve the explosion-proof performance of the fire-fighting system, the invention patent with publication number CN208911356U discloses a compressed air foam nozzle for use in flammable and explosive environments. The explosion-proof performance is improved through one-piece molding, but the liquid inlet of the nozzle and the fire-fighting pipe are still exposed to the outside, and there is a risk of explosion of the converter transformer damaging the connection part of the nozzle or causing deformation of the pipe. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a fire sprinkler capable of preventing damage in a fire and explosion accident of an ultra-high voltage converter transformer.

[0007] The present invention solves the above technical problems through the following technical solutions: an explosion-proof fire sprinkler for ultra-high voltage converter transformer fire, comprising a fire-fighting pipe nested in an explosion-proof pipe, on which a sprinkler facing the converter transformer is screwed and fixed, and the installation position of the sprinkler is hidden in the explosion-proof pipe.

[0008] The present invention can prevent the installation position of the nozzle from being damaged during an explosion by hiding the installation position of the nozzle inside the explosion-proof pipe, and the fire-fighting pipeline is protected by the explosion-proof pipe and will not be damaged by the explosion, ensuring that the position of the nozzle and the connecting branch pipe connecting the nozzle and the fire-fighting pipeline after the explosion will not change due to the explosion impact and high-temperature deformation, and will not affect the envelope of the fire-fighting system over the fire-fighting area.

[0009] Preferably, the explosion-proof pipe is fixed to the fire wall and / or concrete foundation by screwing, welding or pre-embedding, and the explosion-proof pipe has a mounting hole for the nozzle to pass through; the fire-fighting pipe has a liquid outlet pipe coaxial with the mounting hole, the liquid outlet pipe is provided with an internal thread, and the nozzle has an external thread that is screwed to cooperate with the internal thread.

[0010] Preferably, the nozzle includes a release frustum in a dome shape and a fixed pipe fixedly connected to the release frustum. The external thread is provided on the fixed pipe, and a spring gasket is installed between the release frustum and the explosion-proof pipe.

[0011] Preferably, a mounting seat is further provided on the side of the mounting hole facing the converter transformer, and the mounting seat is fixedly fitted with the liquid outlet pipe.

[0012] Preferably, the mounting seat includes a fixing plate fixedly fitted with the outer pipe wall of the explosion-proof pipe. The surface of the fixing plate has a through hole allowing the nozzle to pass through, and the fixing plate is fixedly fitted with the liquid outlet pipe.

[0013] Preferably, the inner surface of the through hole of the fixing plate is directly fixedly fitted with the end of the liquid outlet pipe.

[0014] Preferably, the end of the liquid outlet pipe extends out of the explosion-proof pipe towards the converter transformer. The diameter of the through hole is larger than the diameter of the liquid outlet pipe. A first transition plate fixedly connected to the end of the liquid outlet pipe is provided on the inner surface of the through hole. The included angle between the first transition plate and the fixing plate is an obtuse angle, and the included angle with the axial direction of the liquid outlet pipe is an acute angle.

[0015] Preferably, the mounting seat further includes an annular connecting plate fixedly fitted with the fixing plate, and the connecting plate is fixedly fitted with the outer pipe wall of the liquid outlet pipe.

[0016] Preferably, the fixing plate and the connecting plate are connected by a second transition plate. The second transition plate is inclined towards the inside of the explosion-proof pipe, and the surface of the release frustum connected to the fixed pipe is inclined to adaptively cooperate with the transition plate.

[0017] Preferably, the release frustum has a plurality of release channels. The ends of the release channels are located at the position where the release frustum is connected to the fixed pipe. The release channels divide the end of the fixed pipe into a plurality of strip-shaped spaces. The end of the fixed pipe is provided with dispersion holes covering the cross-section of the fixed pipe. The fire extinguishing medium enters different release channels through the dispersion holes; opposite arc-shaped protrusions are respectively provided on both sides of the release end of the release channel.

[0018] The advantages of the explosion-proof fire sprinkler for UHV converter transformer fires provided by the present invention are as follows: By hiding the installation position of the sprinkler inside the explosion-proof pipe, it can prevent damage to the installation position of the sprinkler during an explosion, and the fire pipeline is protected by the explosion-proof pipe and will not be damaged by the explosion, ensuring that the position of the sprinkler and the connecting branch pipe connecting the sprinkler and the fire pipeline will not change due to explosion shock and high-temperature deformation after the explosion, without affecting the envelope of the fire extinguishing area by the fire protection system. The explosion-proof pipe is fixed on the firewall and the concrete foundation, and can transfer the shock wave of the explosion to other positions for dispersion, reducing the impact on the fire pipeline; the sprinkler is fixed to the fire pipeline by screwing, and the sprinkler is connected through a spring gasket to improve the axial stability and facilitate disassembly; the liquid outlet pipe is fixed through the mounting seat to form an integral body of the fire pipeline and the explosion-proof pipe, improving the stability; through different mounting seat designs, the protection and fixing effect of the sprinkler are improved; a release flow channel is arranged in the release frustum of the sprinkler, which can evenly disperse the fire extinguishing medium, improve the coverage area and effect, and an arc-shaped protrusion is arranged at the release end to prevent tip discharge and improve safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the explosion-proof fire sprinkler for UHV converter transformer fires provided in Embodiment 1 of the present invention;

[0020] Figure 2 Schematic diagram of the explosion-proof fire sprinkler for UHV converter transformer fires provided in Embodiment 2 of the present invention;

[0021] Figure 3 Schematic diagram of the explosion-proof fire sprinkler for UHV converter transformer fires provided in Embodiment 3 of the present invention;

[0022] Figure 4 Schematic diagram of the explosion-proof fire sprinkler for UHV converter transformer fires provided in Embodiment 4 of the present invention;

[0023] Figure 5 Schematic diagram of the explosion-proof fire sprinkler for UHV converter transformer fires provided in Embodiment 5 of the present invention;

[0024] Figure 6 is Figure 5 A-sectional view in the A direction. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] To make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to specific embodiments and the accompanying drawings.

[0026] Refer to Figure 1, this embodiment provides an explosion-proof fire sprinkler for UHV converter transformer fires, including a fire pipeline 2 nested in an explosion-proof pipe 1. A sprinkler 3 facing the converter transformer is fixedly screwed on the fire pipeline 2, and the installation position of the sprinkler 3 is hidden inside the explosion-proof pipe 1.

[0027] In this embodiment, by hiding the installation position of the sprinkler 3 inside the explosion-proof pipe 1, damage to the installation position of the sprinkler during an explosion can be prevented, and the fire pipeline 2 is protected by the explosion-proof pipe 1 and will not be damaged by the explosion, ensuring that the position of the sprinkler 3 and the connecting branch pipe (not shown in the figure) connecting the sprinkler 3 and the fire pipeline 2 will not change due to explosion shock and high-temperature deformation after the explosion, and will not affect the envelope of the fire extinguishing area by the fire protection system.

[0028] For the above technical solutions, the specific embodiments provided by the present invention are as follows.

[0029] Embodiment 1

[0030] Reference Figure 1 , the explosion-proof pipe 1 is fixed on the firewall and / or concrete foundation beside the converter transformer by screwing, welding or embedding. The explosion-proof pipe 1 has an installation hole 11 for the sprinkler 3 to pass through. The fire pipeline 2 has a liquid outlet pipe 21 coaxial with the installation hole 11. An internal thread 22 is provided on the liquid outlet pipe 21, and an external thread 31 screwed and matched with the internal thread 22 is provided on the sprinkler 3, so that the sprinkler 3 can be fixedly screwed inside the explosion-proof pipe 1. During an explosion, the fire pipeline 2 may collide with the inner wall of the explosion-proof pipe 1. In a preferred embodiment, a buffer pad 12 can be provided inside the explosion-proof pipe 1 for buffer protection. The buffer pad 12 can be provided inside the explosion-proof pipe 1 or outside the fire pipeline 2. For the convenience of operation, it can generally be directly attached to the outside of the fire pipeline 2, and at least the buffer pad 12 is provided on the side of the fire pipeline 2 facing away from the converter transformer.

[0031] The sprinkler 3 includes a release frustum 32 in a dome shape and a fixed pipe 33 fixedly connected to the release frustum 32. The surface of the release frustum 32 connected to the fixed pipe 33 is a flat bottom surface. The external thread 31 is provided on the fixed pipe 33. The release frustum 32 has release holes 34 on its surface. The aperture and the number of the release holes 34 are determined according to the fire extinguishing range and coverage of the UHV converter transformer. In this embodiment, the sum of the areas of the release holes 34 is not less than the cross-sectional area of the fixed pipe 33, and the diameter of the release holes 34 is 3 - 10 mm; the fire extinguishing medium is ejected through the arc surface of the release frustum 32 to carry out fire extinguishing operations on the target area, and the release of the fire extinguishing medium is uniform, forming single-point multi-directional coverage, which is beneficial to improving the adaptability in the case of explosion fires of UHV converter transformers.

[0032] A flat gasket (not shown in the figure) and a spring gasket (not shown in the figure) are provided between the flat bottom surface of the release frustum 32 and the explosion-proof pipe 1, thereby improving the axial stability of the nozzle 3 and preventing shaking during an explosion. Moreover, since the spring gasket is in a compressed state, it can provide an axial stabilizing force when disassembling and assembling the nozzle 3, facilitating maintenance and replacement.

[0033] Embodiment 2

[0034] Reference Figure 2 , the difference between this embodiment and Embodiment 1 is that a mounting seat (not shown in the figure) is further fixed on the side of the mounting hole 11 facing the converter transformer. The mounting seat is fixedly fitted with the liquid outlet pipe 21, thereby fixing the liquid outlet pipe 21 and improving the stability of the fire-fighting pipeline 2. The mounting seat includes a fixing plate 41 fixedly fitted with the outer pipe wall of the explosion-proof pipe 1. The fixing plate 41 has a through hole (not shown in the figure) allowing the nozzle 3 to pass through. The fixing plate 41 is fixedly fitted with the liquid outlet pipe 21, thereby assisting in fixing the liquid outlet pipe 21 and improving the stability of the fire-fighting pipeline 2. The shape of the fixing plate 41 is adaptively fitted with the explosion-proof pipe 1. In this embodiment, the fixing plate 41 is directly welded or screwed to the end of the liquid outlet pipe 21. The nozzle 3 adopts the same scheme as in Embodiment 1. At this time, the shaking amplitude of the fire-fighting pipeline 2 is limited, and the buffer pad 12 for protecting the fire-fighting pipeline 2 can be cancelled.

[0035] Embodiment 3

[0036] Reference Figure 3 , the difference between this embodiment and Embodiment 2 is that the end of the liquid outlet pipe 21 extends outside the explosion-proof pipe 1. The diameter of the through hole on the fixing plate 41 is larger than the diameter of the liquid outlet pipe 21. A first transition plate 42 fixedly connected to the end of the liquid outlet pipe 21 is provided at the end of the fixing plate 41. The first transition plate 42 is integrally formed with or welded to the fixing plate 41. The first transition plate 42 is welded or screwed to the liquid outlet pipe 21. The included angle between the first transition plate 42 and the fixing plate 41 is an obtuse angle, and the included angle with the axis of the liquid outlet pipe 21 is an acute angle.

[0037] When the nozzle 3 is subjected to an axial explosion impact force, part of the pressure can be released through the deformation of the first transition plate 42 to prevent the nozzle 3 from being damaged.

[0038] For Embodiments 2 and 3, since the end of the liquid outlet pipe 21 finally coincides with or extends out of the explosion-proof pipe 1, the diameter of the explosion-proof pipe 1 needs to be larger than that of the fire-fighting pipeline 2 to ensure that the fire-fighting pipeline 2 with the liquid outlet pipe 21 fixed can axially move inside the explosion-proof pipe 1 for nested fitting, and at the same time, the fire-fighting pipeline 2 can be radially adjusted after being in place with the explosion-proof pipe 1 to allow the liquid outlet pipe 21 to extend out of the mounting hole 11.

[0039] Embodiment 4

[0040] ReferenceFigure 4 , in this embodiment, the mounting base further includes an annular connecting plate 43 fixedly fitted with the outer pipe wall of the liquid outlet pipe 21. The axial direction of the connecting plate 43 is parallel to the axial direction of the liquid outlet pipe 21, and the connecting plate 43 is fixedly fitted with the fixing plate 41.

[0041] During use, the fire pipeline 2 is sleeved inside the explosion-proof pipe 1, the liquid outlet pipe 21 is aligned with the mounting hole 11, and then the mounting base is clamped inside the mounting hole 11. The fixing plate 41 can be fixedly connected to the explosion-proof pipe 1 by welding or screwing. The connecting plate 43 can also be fixedly connected to the liquid outlet pipe 21 by welding or screwing. However, when welding and fixing, only the end close to the converter transformer can be welded. Preferably, bolts (not shown in the figure) are used to connect the liquid outlet pipe 21 and the connecting plate 43 radially inside the liquid outlet pipe 21. The end of the bolt can be hidden under the pipe wall of the liquid outlet pipe 21, and tools such as a socket and a wrench can be used for fixing; in this way, multiple positions can be fixed axially.

[0042] The fixing plate 41 and the connecting plate 43 are perpendicular to each other. When the fixing plate 41 is directly connected to the connecting plate 43, the structure of the nozzle 3 is the same as that in the first embodiment, and the matching state between the installed liquid outlet pipe 21 and the mounting base is substantially the same as that in the second embodiment.

[0043] In this embodiment, a second transition plate 44 is further provided to connect the fixing plate 41 and the connecting plate 43. The second transition plate 44 is inclined towards the inside of the explosion-proof pipe 1. At this time, the surface of the release frustum 32 connected to the fixed pipe 33 is inclined to adapt to the second transition plate 44. After fixing, in addition to the spring gasket, the fixing effect of the nozzle 3 can be improved and the nozzle 3 can be protected by wrapping the nozzle 3 with the second transition plate 44.

[0044] Embodiment Five

[0045] Reference Figure 5 and Figure 6, The difference between this embodiment and the above embodiments lies in the structure of the nozzle 3. When using compressed air foam as the fire-fighting medium, it is necessary to disperse the air foam before spraying to improve the fire extinguishing effect. Based on this, the nozzle 3 provided in this embodiment is provided with a plurality of divergent release channels 35 in the release frustum 32. The ends of the release channels 35 are located at the position where the release frustum 32 is connected to the fixed pipe 33. The release channels 35 divide the end of the fixed pipe 33 into a plurality of strip-shaped spaces. A plurality of dispersion holes 331 covering the cross-section of the fixed pipe 33 are provided at the end of the fixed pipe 33. The fire-fighting medium passes through the dispersion holes 331 and enters different release channels. In the space corresponding to each release channel 35, the total area of the dispersion holes 331 is the same, so as to ensure the uniformity of the dispersion of the fire-fighting medium. According to the use scenario of the nozzle 3 being sidewall type or pendant type, the spraying range central angle of the release frustum 32 is 90° to 180°, the included angle between the release channels 5 is 10° to 30°, and the diameter of the dispersion holes 331 is 3 mm to 10 mm. The nozzle 3 provided in this embodiment has five evenly dispersed release channels 35, so as to increase the coverage area and can be used as a sidewall type nozzle or a pendant type nozzle.

[0046] Since the nozzle 3 provided in this embodiment is used near the converter transformer, in order to prevent tip discharge from occurring at the tips of the release channels 35 in the high electric field area and affecting the personal safety of the operators, arc-shaped protrusions 351 are respectively arranged opposite to both sides of the release end of the release channel 35, and the release end of the release channel 35 directly sprays the fire-fighting medium into the fire-extinguishing area.

Claims

1. An explosion-proof fire sprinkler for UHV converter transformers, characterized in that: It includes a fire pipeline nested in an explosion-proof pipe. A nozzle facing the converter transformer is fixedly screwed on the fire pipeline. The installation position of the nozzle is hidden in the explosion-proof pipe. The nozzle includes a release frustum in the shape of a dome and a fixed pipe fixedly connected to the release frustum. There are multiple release channels in the release frustum. The ends of the release channels are at the position where the release frustum is connected to the fixed pipe. The release channels divide the end of the fixed pipe into multiple strip-shaped spaces. The end of the fixed pipe is provided with dispersion holes covering the cross-section of the fixed pipe. The fire medium enters different release channels through the dispersion holes.

2. The explosion-proof fire sprinkler for UHV converter transformer fires according to claim 1, characterized in that: The explosion-proof pipe is fixed on the firewall and / or concrete foundation by screwing, welding or embedding. The explosion-proof pipe has an installation hole for the nozzle to pass through; the fire pipeline has a liquid outlet pipe coaxial with the installation hole. The liquid outlet pipe is provided with internal threads, and the nozzle has external threads that are screwed and matched with the internal threads.

3. The explosion-proof fire sprinkler for UHV converter transformer fires according to claim 2, characterized in that: The external threads are provided on the fixed pipe, and a spring washer is installed between the release frustum and the explosion-proof pipe.

4. The explosion-proof fire sprinkler for UHV converter transformer fires according to claim 3, characterized in that: An installation seat is further provided on the side of the installation hole facing the converter transformer, and the installation seat is fixedly matched with the liquid outlet pipe.

5. The explosion-proof fire sprinkler for UHV converter transformer fires according to claim 4, characterized in that: The installation seat includes a fixing plate fixedly matched with the outer pipe wall of the explosion-proof pipe. The surface of the fixing plate has a through hole allowing the nozzle to pass through, and the fixing plate is fixedly matched with the liquid outlet pipe.

6. An explosion-proof fire sprinkler for UHV converter transformer fires according to claim 5, characterized in that: The inner surface of the through hole of the fixing plate is directly fixedly matched with the end of the liquid outlet pipe.

7. An explosion-proof fire sprinkler for UHV converter transformer fires according to claim 5, characterized in that: The end of the liquid outlet pipe extends out of the explosion-proof pipe towards the converter transformer. The diameter of the through hole is larger than the diameter of the liquid outlet pipe. The inner surface of the through hole is provided with a first transition plate fixedly connected to the end of the liquid outlet pipe. The included angle between the first transition plate and the fixing plate is an obtuse angle, and the included angle with the axis of the liquid outlet pipe is an acute angle.

8. An explosion-proof fire sprinkler for UHV converter transformer fires according to claim 5, characterized in that: The installation seat further includes an annular connecting plate fixedly matched with the fixing plate, and the connecting plate is fixedly matched with the outer pipe wall of the liquid outlet pipe.

9. The explosion-proof fire sprinkler for UHV converter transformer fires according to claim 8, characterized in that: The fixing plate and the connecting plate are connected by a second transition plate. The second transition plate is inclined towards the inside of the explosion-proof pipe, and the surface where the release frustum is connected to the fixed pipe is inclined to be adaptively matched with the transition plate.

10. An explosion-proof fire sprinkler for UHV converter transformer fires according to any one of claims 1-9, characterized in that: Arc-shaped protrusions are respectively arranged on both sides of the release end of the release channel.

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