A sound insulation cover for a converter transformer with both pressure relief and explosion resistance

Abstract

The present invention discloses a sound insulation cover for a converter transformer with both pressure relief and explosion resistance functions, comprising: a wall steel structure and a roof steel beam; the bottom of the wall steel structure is fixed on the ground, and the two sides and the rear end are assembled by a plurality of metal sound absorption and insulation panels to form an explosion-resistant wall; at the front end of the wall steel structure, a plurality of lightweight explosion relief modules are assembled to form a lightweight explosion relief wall; the roof steel beam is fixedly connected to the top of the wall steel structure, and an openable top cover plate is connected to the roof steel beam. The present invention has the following advantages: according to different parts of the sound insulation cover, the explosion relief design is adopted on the front end cooling fan side, and the explosion resistance design is adopted for the unobstructed wall surface, achieving multiple synergistic effects of pressure relief and damage reduction, the top opening not affecting fire extinguishing, and the unobstructed wall surface explosion resistance preventing harm to maintenance personnel.

Description

Technical Field

[0001] The present invention relates to the technical field of sound insulation enclosures, and particularly to a sound insulation enclosure for a converter transformer with both pressure relief and explosion resistance functions. Background Art

[0002] As the core equipment of a power transmission and transformation project, the converter transformer is also the main noise source in a converter station. Since a large amount of flammable insulating oil is filled inside the converter transformer, with the influence of equipment aging and grid load fluctuations on the equipment, the converter transformer has become an important hazard source prone to fire and explosion. To meet the needs of noise reduction and fire protection, the measures taken in the past were generally to set up a sound insulation enclosure for the converter transformer and then install fire sprinklers inside the sound insulation enclosure, etc., so as to achieve the purpose of reducing noise emissions and, when the equipment catches fire, spraying a fire extinguishing medium through the fire sprinklers to extinguish the fire.

[0003] Since the converter transformer contains a large amount of insulating oil with a high calorific value, the highest oil temperature during normal operation can reach up to 90°C. At the same time, when the equipment is running, the insulating oil is easily decomposed under the action of a fault high-voltage arc to generate flammable and explosive hydrocarbon gases, causing the equipment to explode and burn. In many newly built converter stations, the layout form of the converter transformer is that one side is relatively close to the firewall, the sound insulation enclosure is arranged closely against the firewall, and the other side is relatively far from the firewall, with a maintenance passage set up, and the sound insulation enclosure is separately set as a sound insulation wall. When the equipment explodes, a huge explosion impact force will burst out from the fault position inside the sound insulation enclosure and violently impact each wall and the top cover of the sound insulation enclosure. This situation is particularly serious for the side that is far from the firewall, with a maintenance passage set up and no other shielding. The separately set sound insulation wall will be blown away instantly during the explosion, which will affect the safety of the maintenance passage personnel and cause damage to the surrounding equipment. In the past, the sound insulation enclosures did not have effective anti-explosion and pressure relief designs, and there were two situations: ① When the strength of the walls and the top cover of the sound insulation enclosure is very high, since the explosion impact force cannot be released quickly, it will uncontrollably damage relatively weak parts such as the valve hall enclosure, triggering a fire in the adjacent valve hall and bringing huge damage; ② If the strength of the walls and the top cover of the sound insulation enclosure is not high, the explosion impact will damage each wall and the top cover of the sound insulation enclosure, releasing pressure from each part, posing a serious threat to the safety of maintenance personnel near the sound insulation enclosure. For example, in recent years, there has been an explosion accident of a transformer in a UHV substation, resulting in 1 death and 2 injuries to maintenance personnel, causing relatively serious economic losses and social impacts.

[0004] In addition to the explosion risk, the insulating oil of the converter transformer is flammable and has a high calorific value when burned, which also brings a fire risk to the site. Although a relatively large number of fire sprinklers are installed inside the sound insulation enclosure, the fire sprinklers are generally arranged widely and evenly inside the sound insulation enclosure and are relatively far from the easily ignitable parts. When the equipment catches fire, it is very difficult to extinguish the fire relying solely on the internal fire extinguishing system, and external fire fighting is also required. However, the conventional sound insulation enclosure cannot be opened during a fire, which will block external fire fighting, and ultimately cause a large area of burning insulating oil to spread, damage the surrounding adjacent auxiliary facilities, etc., resulting in huge economic losses.

[0005] In the prior art, the invention patent with the patent application publication number CN110947122A discloses a special high-voltage converter transformer emergency fire protection structure, including a door closer, an electromagnet, and a high-temperature resistant rotating shaft. This invention can be used as the Box-in (sound insulation enclosure) structure of the special high-voltage converter transformer, which can meet the requirements of normal sound insulation, heat dissipation, and on-site personnel maintenance, and can also achieve the effect of promptly bouncing the noise reduction board outward when a fire occurs inside the Box-in structure of the special high-voltage converter transformer, eliminating the obstruction of external fire fighting and rescue, and providing a basic guarantee for the normal operation of the internal fire extinguishing system of the special high-voltage converter transformer and the effective development of external fire fighting and rescue. However, the electromagnet is cited in this patent. The noise reduction board is closed in the normal power supply state and bounces outward after a power outage. Other studies also mention devices that open when powered and close after a power outage. Such devices all have the following defects: First, these devices all need the magnetic suction force of magnetic induction to open or close, and are relatively sensitive to interference from external magnetic fields. The converter transformer area inside the converter station itself is in a strong magnetic field environment, which easily causes changes in the magnetic field of the electromagnet and thus fails to open effectively; Second, the magnetic field generated by the electromagnet interacts with the magnetic field of the converter transformer itself, easily causing changes in the magnetic field of the converter transformer, and then causing changes in the insulation safety distance, which in turn affects the safe operation of the converter transformer and the safety maintenance of operation and maintenance personnel.

[0006] The invention patent with the patent application publication number CN112206435A discloses a sound absorption and insulation safety device applicable to Box-in of a converter station. In this patent, when the temperature at the thermal fuse is higher than the melting point due to a fire inside the Box-in, the thermal fuse melts and the opening and closing mechanism opens the noise reduction board. However, this patented technology has the following defects: First, it cannot be linked to active fire extinguishing; Second, the opening reliability is poor. Multiple steps are required: the thermal fuse first melts as a prerequisite for opening, and then the first support rod and the second support rod slide open. At the same time, the second support rod also needs to generate a thrust to push the Box-in to rotate. In addition, the opening part of this patented technology is also provided with sound insulation materials, which are relatively heavy as a whole, and are prone to jamming or even not opening at all during the opening action due to insufficient construction accuracy between the support rods, being exposed to rain, aging, and corrosion during use, resulting in the failure of the opening action. Summary of the Invention

[0007] The technical problem to be solved by the present invention is that the existing sound insulation enclosure has no effective explosion-proof and explosion-relief design.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0009] A soundproof enclosure for a converter transformer with both pressure relief and explosion resistance, comprising: a wall steel structure 10, a roof steel beam 20;

[0010] The bottom of the wall steel structure 10 is fixed to the ground, and a plurality of metal sound-absorbing and sound-insulating panels 30 are assembled on the unobstructed wall surface of the wall steel structure 10 to form an explosion-proof wall 300; a plurality of lightweight explosion-proof modules 40 are assembled at the front end of the wall steel structure 10 to form a lightweight explosion-proof wall 400; the roof steel beam 20 is fixedly connected to the top of the wall steel structure 10, and the top cover plate 500 can be opened to be connected to the roof steel beam 20.

[0011] In one embodiment of the present invention, the metal sound absorbing and insulating plate 30 is installed on the wall steel structure 10 through the through bolts 310; the through bolts 310 are provided with steel pipe sleeves 311. When in use, the steel pipe sleeves 311 are located inside the metal sound absorbing and insulating plate 30, and pads 312 are provided at both ends of the steel pipe sleeves 311.

[0012] In one embodiment of the present invention, a cooling fan 11 is disposed at the front end of the wall steel structure 10 , and the lightweight explosion-proof wall 400 is located behind the cooling fan 11 .

[0013] In one embodiment of the present invention, the lightweight explosion relief module 40 is fixed to the wall steel structure 10 via a pressure relief adjustable card 410;

[0014] The pressure relief adjustable card 410 includes a first pressure relief adjustable sub-card 411, a second pressure relief adjustable sub-card 412 and a pressure relief adjustable connecting sub-card 413;

[0015] The two ends of the adjustable pressure relief connecting sub-card 413 are fixed to the first adjustable pressure relief sub-card 411 and the second adjustable pressure relief sub-card 412 in a stepped shape.

[0016] In one embodiment of the present invention, according to the pressure relief index of the lightweight explosion relief wall 400, different specifications of the adjustable pressure relief cards 410 are selected;

[0017] The relationship between the pressure relief index of the lightweight explosion relief wall 400 and the pressure relief adjustable cards 410 of different specifications is as follows:

[0018] ; ;

[0019] In the formula, It is expressed as the pressure relief index of lightweight explosion-proof wall. It is expressed as the sum of the pressing forces of all pressure relief adjustable cards on each lightweight pressure relief module. It is expressed as the projected area of a single lightweight pressure relief module. It is expressed as the pressing force of one of the pressure relief adjustable cards on the lightweight pressure relief module. It is expressed as the width of the pressure relief adjustable card. It is expressed as the thickness of the pressure relief adjustable card. It is expressed as the bending strength of the material of the pressure relief adjustable card. It is expressed as the span of the force application point of the pressure relief adjustable card.

[0020] In an embodiment of the present invention, the openable top cover plate 500 is formed by combining a plurality of openable top cover modules 50; wherein, the top cover module 50 includes a top cover module outer frame 51, an openable cover plate 52, a cover plate spring 53, and a fusible bolt 54.

[0021] Wherein, a hole is provided in the middle of the top cover module outer frame 51; the openable cover plate 52 is located at the hole, and one side of the openable cover plate 52 is movably connected to the top cover module outer frame 51.

[0022] Both ends of the cover plate spring 53 are respectively connected to the top cover module outer frame 51 and the openable cover plate 52; and, the fusible bolt 54 passes through the cover plate spring 53 and is connected to the top cover module outer frame 51 and the openable cover plate 52.

[0023] In an embodiment of the present invention, when the converter transformer is operating normally, the fusible bolt 54 locks the openable cover plate 52, the openable cover plate 52 is in a closed state, and the cover plate spring 53 is in a compressed state; when a fire occurs in the converter transformer, the high temperature generated causes the fusible bolt 54 to be melted, the cover plate spring 53 rebounds, and the openable cover plate 52 is pushed open, achieving the purpose of opening the openable top cover plate 500.

[0024] In an embodiment of the present invention, the top cover module 50 includes a fire extinguishing device; the fire extinguishing device includes a fire extinguishing tank 55, a heat melting switch 56, and a fire extinguishing pipeline 57.

[0025] The fire extinguishing tank 55 is integrally fixed to one side of the top cover module outer frame 51 facing the transformer equipment; the fire extinguishing pipeline 57 is connected to the outlet of the fire extinguishing tank 55.

[0026] The heat melting switch 56 includes a switch spring 561, a switch connecting shaft 562, a heat melting locking bolt 563, and an internal pipeline 564.

[0027] The hot melt locking bolt 563 located outside the fire extinguisher tank 55 is connected to the switch connecting shaft 562, and the switch connecting shaft 562 is connected to the internal pipe 564 after passing through the switch spring 561; wherein, a limit plate 565 is provided on the switch connecting shaft 562 to limit the elongation length of the switch spring 561; by adjusting the connection depth between the hot melt locking bolt 563 and the switch connecting shaft 562, the compression state of the switch spring 561 can be adjusted.

[0028] In one embodiment of the present invention, the internal pipe 564 is located inside the fire extinguisher tank 55, and an opening is provided on the internal pipe 564, with the opening facing the outlet of the fire extinguisher tank 55; by adjusting the compression state of the switch spring 561, the opening of the internal pipe 564 is aligned or staggered with the outlet state of the fire extinguisher tank 55.

[0029] In one embodiment of the present invention, when the converter transformer is in normal working state, due to the locking effect of the hot melt locking bolt 563, the switch spring 561 is in a compressed state, the opening of the internal pipe 564 is offset from the outlet of the fire extinguishing tank 55, and the compressed air in the fire extinguishing tank 55 cannot spray the fire extinguishing agent through the fire extinguishing pipe 57;

[0030] When a fire occurs in the transformer equipment, the high temperature causes the hot melt locking bolt 563 to be melted, the switch spring 561 to stretch and open, and at the same time, restricted by the limiting plate 565, the opening of the internal pipe 564 is aligned with the outlet of the fire extinguishing tank 55, and the compressed air in the fire extinguishing tank 55 sprays the fire extinguishing agent out through the fire extinguishing pipe 57.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The present invention aims at the problem of explosion and fire hazards in converter transformers. In combination with the different explosion-relief and explosion-proof requirements of the walls of the soundproof enclosure, the explosion-relief and explosion-proof structures are designed in a targeted manner. The walls of the unobstructed maintenance passage are set as explosion-proof walls to prevent the impact caused by the explosion from harming maintenance personnel. On the cooling fan side, a lightweight explosion-relief wall is set to make full use of the shielding of the cooling fan to prevent the explosion-relief wall from splashing outward and harming people and objects, while also playing the role of explosion-relief and pressure relief. The present invention reduces the danger of the converter transformer in an explosion accident as a whole, and plays a role in protecting people and property.

[0033] The present invention proposes a pressure relief adjustable card structure and a method for calculating the pressure relief index of a lightweight explosion relief module. By combining the specifications and sizes of the pressure relief adjustable card in different ways, the corresponding required pressure relief index can be obtained. When the explosion overpressure reaches the pressure relief index, the pressure relief can be quickly opened to reduce damage to the internal fire protection system pipes and other facilities of the converter transformer due to the inability to relieve pressure.

[0034] The sound insulation cover proposed by the present invention has the functions of fire extinguishing and an openable top cover, which creates favorable conditions for fire fighting and enables efficient suppression of fires in converter transformers. The present invention also adopts a cover plate that is opened by heat melting, which can more reliably achieve the function of heat melting and flipping. In the event of a fire in the converter transformer, it can open a window for external fire fighting.

[0035] The present invention also integrates a fire extinguishing device activated by heat melting with the top cover of the sound insulation cover. When a fire occurs in the converter transformer, the fire extinguishing device is affected by high temperature and can actively open the fire extinguishing switch to spray fire extinguishing agent towards the easily ignited parts in a targeted manner. The present invention enables the sound insulation cover to not only have the function of noise reduction but also the function of active fire extinguishing, making the overall function more powerful.

[0036] The top cover of the sound insulation cover designed in the present invention adopts an actively opened method. When affected by high temperature during a fire, the openable cover plate will open due to melting, without the need for electric, mechanical transmission, and personnel operation, thus avoiding the possible failure of electrical and mechanical structures during a fire and the danger during personnel operation in a high-risk fire situation. The opening action of the cover plate is directly realized by springs and heat-melting bolts, with a more reliable structure and more stable performance. At the same time, if corrosion or aging occurs, problems can be discovered during daily inspection and maintenance by personnel, and they can be replaced or repaired in time to eliminate potential hazards. Currently, conventionally, a scheme of using a heat-melting support plate to support the metal noise reduction plate to open at the top of the sound insulation cover is adopted. When a fire occurs in the converter transformer, the heat-melting support plate melts and loses its supporting effect, and the metal noise reduction plate falls off, causing the top of the sound insulation cover to open. However, in this way, in order to have the supporting and load-bearing functions, the thickness of the heat-melting support plate is about 1 cm, and at least four heat-melting support plates are required to support one metal noise reduction plate. Due to the need for the combined action of high temperature and time for high-temperature melting, it often takes 3 - 5 minutes to melt and fall, and after falling, the large metal noise reduction plate still blocks the fire source and affects fire extinguishing. In addition, this way of opening the top is slow. Fires in converter transformers often start with an explosion and then evolve into deflagration fires. The explosion occurs rapidly, quickly increasing the internal pressure of the sound insulation cover, which will impact the weak parts at the top of the sound insulation cover, such as bushings and internal fire-fighting system pipes, etc., and it is impossible to form an effective anti-explosion and pressure-relief design for the sound insulation cover, and it is impossible to achieve anti-explosion and pressure relief at different positions.

[0037] The present invention has the following advantages: First, it adopts a pressure relief adjustable card structure on the side of the front-end cooling fan, combined with the calculation method of the pressure relief index of the lightweight pressure relief module, to achieve rapid opening and pressure relief at the moment of explosion of the converter transformer, reducing the damage caused by explosion overpressure to the fire-fighting system pipes and other facilities in the converter transformer area; Second, the top of the converter transformer adopts heat-fusible bolts, which are small in size, do not require a large load-bearing function, have a fast melting speed, can quickly open the top, and are convenient for external fire fighting to spray fire extinguishing medium from the top to effectively extinguish the fire. This design realizes the coordinated effect of pressure relief on the side of the front-end cooling fan and top opening without affecting fire extinguishing.

[0038] In addition, the openable cover in this design is a metal noise reduction plate that is not fusible. Compared with the fusible noise reduction plate, the metal material has better stability and mechanical properties. Therefore, it has better load-bearing capacity when used on the top cover of the soundproof enclosure, making it more convenient for personnel to perform maintenance work on the top cover of the soundproof enclosure.

[0039] The present invention integrates the active fire-fighting function, linking the fire extinguisher with the high temperature generated by the fire, that is, the high temperature generated by the fire can activate the fire extinguisher switch, and the fire can be extinguished in time through the nozzle originally set to aim at the fire-prone parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 The present invention is a schematic diagram of a soundproof enclosure for a converter transformer with both pressure relief and explosion resistance according to an embodiment of the present invention.

[0041] Figure 2 FIG. 1 is a top view of a sound insulation cover according to an embodiment of the present invention.

[0042] Figure 3 Schematic diagram of the wall steel structure and roof steel beam according to an embodiment of the present invention.

[0043] Figure 4 Schematic diagram of the metal sound absorbing and insulating panel and the wall steel structure according to an embodiment of the present invention.

[0044] Figure 5 It is a schematic diagram of the adjustable pressure relief card, lightweight explosion relief module and wall steel structure of an embodiment of the present invention.

[0045] Figure 6 Schematic diagram of an adjustable pressure relief card according to an embodiment of the present invention.

[0046] Figure 7 Schematic diagram of a top cover module according to an embodiment of the present invention.

[0047] Figure 8 This is a schematic diagram of a fire extinguishing device in a closed state according to an embodiment of the present invention.

[0048] Figure 9 This is a schematic diagram of the fire extinguishing device in the open state according to an embodiment of the present invention. DETAILED DESCRIPTION

[0049] In order to facilitate those skilled in the art to understand the technical solution of the present invention, the technical solution of the present invention is further described in conjunction with the accompanying drawings of the specification.

[0050] 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 quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality of" means two or more unless otherwise specifically defined.

[0051] Please refer to Figures 1 to 3 As shown, the present invention provides a sound insulation cover for a converter transformer with both pressure relief and explosion resistance, including: a wall steel structure 10 and a roof steel beam 20. Among them, the bottom of the wall steel structure 10 is fixed on the ground, and a plurality of metal sound absorption and insulation panels 30 are assembled on the unobstructed wall of the wall steel structure 10 to form an explosion-resistant wall 300. A plurality of lightweight explosion relief modules 40 are assembled at the front end of the wall steel structure 10 to form a lightweight explosion relief wall 400. The roof steel beam 20 is fixedly connected to the top of the wall steel structure 10, and an openable top cover plate 500 and an explosion relief and noise reduction plate 60 are connected to the roof steel beam 20.

[0052] In an embodiment of the present invention, the wall steel structure 10 is composed of hot-rolled H-beams, channel steels, angle steels, etc. The surface of the steel section needs to be hot-dip galvanized and painted to play a role in anti-corrosion and improving the appearance effect. The wall steel structure 10 ensures the stability of the overall structure, so that the sound insulation cover will not overturn and collapse due to typhoons or earthquakes. The wall steel structure 10 is connected to each other by bolts and fixed to the civil engineering foundation by anchor bolts.

[0053] In an embodiment of the present invention, the roof steel beam 20 is composed of hot-rolled H-beams, channel steels, angle steels, etc. The surface of the steel section needs to be hot-dip galvanized and painted to play a role in anti-corrosion and improving the appearance effect. The roof steel beam 20 is used to install various components of the sound insulation cover top cover and at the same time plays a role in supporting the sound insulation cover top cover.

[0054] In an embodiment of the present invention, the metal sound absorption and insulation panel 30 has a thickness of 100 mm to 150 mm. The structure is composed of a 2-mm-thick galvanized back plate combined with a skeleton formed by folding a 1.5-mm-thick galvanized plate. 48 kg / m³ of glass wool and fiberglass cloth for covering the glass wool are filled inside, and finally enclosed by a 1-mm-thick perforated panel. The surface of the metal sound absorption and insulation panel 30 is spray-treated.

[0055] In this embodiment, the metal sound absorption and insulation panel 30 is installed on the wall steel structure 10 through through bolts 310. A steel pipe sleeve 311 is provided on the through bolt 310. During use, the steel pipe sleeve 311 is inside the metal sound absorption and insulation panel 30, and backing plates 312 are provided at both ends of the steel pipe sleeve 311, see Figure 4Specifically, the outer diameter of the steel pipe sleeve 311 is 22 mm, the inner diameter is 16 mm, the thickness of the circular pad 312 is 4 mm, and the diameter of the pad 312 is 50 mm, which mainly serves to strengthen the fixing part of the through bolt 310 to prevent the metal sound-absorbing and insulating plate 30 from being torn at the through bolt 310 when the converter transformer explodes. The overall function of the explosion-proof wall 300 is to protect the personal safety of maintenance personnel in the corresponding area when the converter transformer explodes in the soundproof enclosure.

[0056] In one embodiment of the present invention, a cooling fan 11 is provided at the front end of the wall steel structure 10, and the lightweight explosion-proof wall 400 is located behind the cooling fan 11. By utilizing the shielding and protective function of the cooling fan 11, when the lightweight explosion-proof wall 400 is blown away, it can be shielded by the cooling fan 11 and will not cause damage to personal property outside.

[0057] In this embodiment, the lightweight explosion relief wall 400 is assembled by a plurality of lightweight explosion relief modules 40, with a total thickness of 100 mm. The lightweight explosion relief module 40 is composed of a 1.5 mm thick galvanized outer panel combined with a 1.2 mm thick galvanized sheet folded into a frame, filled with 32 kg / m³ glass wool and glass wool covered with glass fiber cloth, and finally enclosed with a 0.8 mm thick inner panel. The weight of the lightweight explosion relief module is ≤32 kg / m², meeting the requirements for the surface density of the explosion relief design in GB 50016 "Code for Fire Protection Design of Buildings".

[0058] See also Figure 5 , Figure 6 As shown, in this embodiment, the lightweight explosion relief module 40 is fixed to the wall steel structure 10 through the adjustable pressure relief card 410. The adjustable pressure relief card 410 includes a first adjustable pressure relief sub-card 411, a second adjustable pressure relief sub-card 412 and an adjustable pressure relief connecting sub-card 413, and the two ends of the adjustable pressure relief connecting sub-card 413 are fixed to the first adjustable pressure relief sub-card 411 and the second adjustable pressure relief sub-card 412 in a stepped shape.

[0059] In this embodiment, the pressure relief performance of the adjustable pressure relief card 410 is related to the width, thickness, and length. Specifically, according to the pressure relief index of the lightweight explosion relief wall 400, different specifications of the adjustable pressure relief card 410 are selected. Among them, the relationship between the pressure relief index of the lightweight explosion relief wall 400 and the adjustable pressure relief card 410 of different rules is as follows:

[0060] ; ;

[0061] In the formula, It is expressed as the pressure relief index of lightweight explosion-proof wall, in Pa. It is expressed as the sum of the pressing forces of all adjustable pressure relief cards on each lightweight explosion relief module, in N. It represents the projected area of a single lightweight explosion venting module, with the unit of ㎡. It represents the pressing force of one of the pressure relief adjustable cards on the lightweight explosion venting module, with the unit of N. It represents the width of the pressure relief adjustable card, with the unit of m. It represents the thickness of the pressure relief adjustable card, with the unit of m. It represents the flexural strength of the material of the pressure relief adjustable card, with the unit of Pa. Taking the Q235B material as an example, its flexural strength is 215000000 Pa or 215 MPa. It represents the span of the force application point of the pressure relief adjustable card, with the unit of m.

[0062] In this embodiment, the present invention gives the pressure relief performance of pressure relief adjustable cards of different specifications, as shown in Table 1.

[0063] Table 1 Pressure Relief Performance Table of Pressure Relief Adjustable Cards of Different Specifications

[0064]

[0065] Among them, the material of the pressure relief adjustable card in Table 1 is Q23B material, and the flexural strength of the material is 215 Mpa. In Table 1, the effective length can be understood as the span of the force application point of the pressure relief adjustable card.

[0066] In this embodiment, each lightweight explosion venting module 40 is provided with 4 pressure relief adjustable cards 410, that is, the sum of the pressing forces of all the pressure relief adjustable cards on each lightweight explosion venting module is the sum of the pressing forces of the four pressure relief adjustable cards. Considering the size of each lightweight explosion venting module 40 as 2.5 m in length × 1 m in width. According to the pressure relief performance in Table 1, combined with material cost, processing performance, etc., the pressure relief adjustable card 410 is selected with a specification of 25 mm in width, 3 mm in thickness and 100 mm in length.

[0067] Please refer to Figures 7 to 9 As shown, in an embodiment of the present invention, the top cover plate 500 can be opened and is formed by combining a plurality of openable top cover modules 50. Among them, the top cover module 50 includes an outer frame 51 of the top cover module, an openable cover plate 52, a cover plate spring 53, and a fusible bolt 54.

[0068] In this embodiment, the thickness of the outer frame 51 of the top cover module is 150 mm, which is folded into a box shape with a 2-mm thick galvanized steel plate, facilitating the internal integrated installation of the fire extinguishing device. There is an opening in the middle, and the area of the opening is 50% - 65% of the outer contour area of the outer frame 51 of the top cover module. A 30-mm high waterproof flange is provided around the upper part of the opening. There are mainly three reasons for choosing this range for the opening area: 1. To open a sufficient area during a fire for external fire extinguishing, the opening area should not be too small, so the opening area is not less than 50%. 2. The larger the opening area, the smaller the size of the outer frame 51 of the top cover module, which will result in a lower load-bearing capacity of the openable cover plate 52. Therefore, the opening area should not be too large. 3. Since a fire extinguishing device also needs to be integrated inside each outer frame 51 of the top cover module and the fire extinguishing device is arranged inside the outer frame, if the opening area is too large, the outer frame will be too small, making it impossible to install the fire extinguishing device inside the outer frame 51 of the top cover module.

[0069] In this embodiment, the openable cover plate 52 is made of a 3-mm thick galvanized steel plate, and flanges with a height of 20 mm are folded on the four sides to improve the strength. The openable cover plate 52 is located at the opening, and one side of the openable cover plate 52 is movably connected to the outer frame 51 of the top cover module, for example, through a hinge connection. When the openable cover plate 52 is opened, it rotates and opens along the axis of the hinge. The number of hinges for each openable cover plate 52 is not less than 2 and is evenly arranged.

[0070] In this embodiment, both ends of the cover plate spring 53 are respectively connected to the outer frame 51 of the top cover module and the openable cover plate 52. When the openable cover plate 52 is closed, the cover plate spring 53 is in a compressed state. When the cover plate spring 53 is not restricted by the fusible bolt 54, the cover plate spring 53 pushes the openable cover plate 52 open, thus realizing the opening of the top cover. Two cover plate springs 53 are provided for each openable cover plate 52.

[0071] In this embodiment, the fusible bolt 54 passes through the cover plate spring 53 and is connected to the outer frame 51 of the top cover module and the openable cover plate 52. The fusible bolt 54 is made of PA66 nylon material, the bolt specification is M12×150, the heat distortion temperature of the fusible bolt 54 ≥ 180 °C, the melting peak value is 200 °C - 300 °C, and the tensile strength ≥ 80 MPa, which is customized in the market according to the technical parameters. When the converter transformer is operating normally, the openable cover plate 52 is locked and in a closed state, and the cover plate spring 53 is in a compressed state. When a fire occurs in the converter transformer, the high temperature generated melts the fusible bolt 54, and the cover plate spring 53 springs open, pushing the openable cover plate 52 open, achieving the purpose of opening the cover plate, thus providing favorable conditions for external fire fighting and rescue. Also, a set of fusible bolts 54 is provided at each cover plate spring 53.

[0072] In this embodiment, the top cover module 50 includes a fire extinguishing device, which includes a fire extinguishing tank 55, a hot melt switch 56, and a fire extinguishing pipe 57. The fire extinguishing tank 55 is integrated and fixed to a side of the top cover module outer frame 51 facing the converter transformer, and the fire extinguishing pipe 57 is connected to the outlet of the fire extinguishing tank 55. The hot melt switch 56 includes a switch spring 561, a switch connecting shaft 562, a hot melt locking bolt 563 and an internal pipe 564. The hot melt locking bolt 563 located outside the fire extinguishing tank 55 is connected to the switch connecting shaft 562, and the switch connecting shaft 562 is connected to the internal pipe 564 after passing through the switch spring 561. Among them, a limit plate 565 is provided on the switch connecting shaft 562. By adjusting the connection depth between the hot melt locking bolt 563 and the switch connecting shaft 562, the compression state of the switch spring 561 can be adjusted. The internal pipe 564 and the switch spring 561 are located in the fire extinguishing tank 55, at the mouth of the fire extinguishing tank 55, and an opening is provided on the internal pipe 564, which faces the outlet of the fire extinguishing tank 55. By adjusting the compression state of the switch spring 561, the opening of the internal pipe 564 is aligned or staggered with the outlet of the fire extinguishing tank 55. Specifically, the hot melt locking bolt 563 and the switch connecting shaft 562 are adjusted, for example, by threaded connection, and the number of turns is controlled to control the compression state of the switch spring 561, thereby controlling the relative position of the opening on the internal pipe 564 and the outlet of the fire extinguishing tank 55.

[0073] In this embodiment, the fire extinguisher tank 55 has a tank body diameter of 140 mm and is installed inside the top cover module outer frame 51. The fire extinguisher tank 55 is integrated and fixed to a side of the top cover module outer frame 51 facing the converter transformer. The fire extinguisher tank 55 is filled with compressed air and aerosol fire extinguishing agent. When the fire extinguisher switch is turned on, the compressed air sprays the aerosol fire extinguishing agent to extinguish the fire.

[0074] In this embodiment, the limit plate 565 limits the elongation length of the switch spring 561. The hot melt locking bolt 563 is made of PA66 nylon, and the bolt specification is M6×50. The thermal deformation temperature of the hot melt locking bolt 563 is ≥180°C, the melting peak is 200°C~300°C, and the tensile strength is ≥80MPa. It is customized on the market according to technical parameters. When the converter transformer is in normal working condition, due to the locking effect of the hot melt locking bolt 563, the switch spring 561 is in a compressed state, the opening of the internal pipe 564 is staggered with the outlet of the fire extinguishing tank 55, and the compressed air in the fire extinguishing tank 55 cannot spray the fire extinguishing agent through the fire extinguishing pipe 57. Figure 8 When a fire occurs in the converter transformer, the high temperature causes the hot melt locking bolt 563 to be melted, the switch spring 561 is stretched, and at the same time, it is restricted by the limit plate 565, and the opening of the internal pipe 564 is aligned with the outlet of the fire extinguishing tank 55. The compressed air in the fire extinguishing tank 55 sprays the fire extinguishing agent through the fire extinguishing pipe 57. Figure 9 shown.

[0075] In this embodiment, the fire extinguishing pipeline 57 extends outward and aligns with the easily ignitable parts according to the pre-set positions, such as the root of the bushing riser, the flange of the bushing riser, the tap-changer, etc., so as to control the fire at the ignition site in time.

[0076] In this embodiment, the top cover module 50 is fixed on the roof steel beam 20 through fixing bolts, which can prevent the top cover from being overturned by strong winds, and at the same time ensure the stability during the explosion of the equipment, avoid secondary injuries caused by flying after the explosion, and also avoid damaging the fire extinguishing device after the explosion, affecting subsequent fire extinguishing operations.

[0077] Please refer to Figures 1 to 9 As shown, the explosion venting and noise reduction board 60 is made of a metal noise reduction board combined with a flipping hinge to form a flipping module structure, which is arranged at the top of the sound insulation cover near the areas prone to explosion such as the bushing of the converter transformer and the tap-changer. When an explosion occurs inside the equipment in the sound insulation cover, the metal noise reduction board rotates along the pin shaft of the flipping hinge under the action of the explosion impact force and quickly opens to achieve the purpose of relieving pressure inside the sound insulation cover.

[0078] Please refer to Figures 1 to 9 As shown, the sound insulation cover for the converter transformer with both pressure relief and explosion resistance further includes a sound insulation door 71, an air intake system 72 and an exhaust system 73.

[0079] In this embodiment, the sound insulation door 71 is installed on the wall surface of the sound insulation cover and fixed by bolts. The thickness of the sound insulation door 71 is 100 mm - 150 mm, and its structure is composed of a 2 mm thick galvanized outer panel combined with a skeleton folded from a 1.5 mm thick galvanized plate. Glass wool and fiberglass cloth covering the glass wool are filled inside, and finally enclosed by a 1 mm thick inner panel. The surface of the sound insulation door 71 is spray-treated to play the role of anti-corrosion and beautification. The sound insulation door 71 mainly plays the role of sound insulation and personnel passage.

[0080] In this embodiment, the air intake system 72 includes an air intake muffler and an aluminum alloy rainproof louver. The air intake system 72 is installed at a lower position on the side wall next to the sound insulation door 71, which can allow the cold air outside the sound insulation cover to enter the inside of the sound insulation cover through the sound insulation door 71, and at the same time play the role of noise reduction, meeting the needs of ventilation, heat dissipation and noise reduction. The aluminum alloy rainproof louver plays the role of preventing rain from entering the inside of the sound insulation cover.

[0081] In this embodiment, the exhaust system 73 includes an exhaust fan, an exhaust muffler and an aluminum alloy rainproof louver. The exhaust system 73 is installed at a position on the upper part of the wall surface of the sound insulation cover or on the top cover of the sound insulation cover, which can allow the hot air inside the sound insulation cover to be discharged upward through the exhaust system 73. The exhaust system 73 mainly promotes the exhaust, achieving the purpose of natural air intake and mechanical exhaust. The exhaust muffler meets the needs of both ventilation and noise reduction at the same time, and the aluminum alloy rainproof louver plays the role of preventing rain from entering the inside of the sound insulation cover.

[0082] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention, and any reference signs in the claims should not be regarded as limiting the claims involved.

[0083] The above-described embodiments merely represent the implementation manners of the invention. The protection scope of the present invention is not limited to the above embodiments only. For those skilled in the art, without departing from the concept of the present invention, several modifications and improvements can be made, and these all belong to the protection scope of the present invention.

Claims

1. A soundproof enclosure for a converter transformer with both pressure relief and explosion resistance, characterized in that: include: Wall steel structure (10), roof steel beam (20); The bottom of the wall steel structure (10) is fixed to the ground, and a plurality of metal sound-absorbing and sound-isolating panels (30) are assembled on the unobstructed wall surface of the wall steel structure (10) to form an explosion-resistant wall (300); a plurality of lightweight explosion-relief modules (40) are assembled on the front end of the wall steel structure (10) to form a lightweight explosion-relief wall (400); the roof steel beam (20) is fixedly connected to the top of the wall steel structure (10), and a top cover plate (500) can be opened to be connected to the roof steel beam (20); The lightweight explosion relief module (40) is fixed to the wall steel structure (10) via a pressure relief adjustable card (410); and pressure relief adjustable cards (410) of different specifications are selected according to the pressure relief index of the lightweight explosion relief wall (400); The relationship between the pressure relief index of the lightweight explosion relief wall (400) and the pressure relief adjustable cards (410) of different specifications is as follows: ； ； In the formula, It is expressed as the pressure relief index of lightweight explosion-proof wall. It is expressed as the sum of the pressing forces of all adjustable pressure relief cards on each lightweight explosion relief module. Expressed as the projected area of ​​a single lightweight explosion relief module, It is expressed as the pressing force of one of the adjustable pressure relief cards on the lightweight explosion relief module. Indicates the width of the pressure relief adjustable card, Indicates the thickness of the pressure relief adjustable card, Expressed as the bending strength of the pressure relief adjustable card material, Expressed as the span of the stress points of the pressure relief adjustable card.

2. The soundproof enclosure for converter transformer with both pressure relief and explosion resistance according to claim 1 is characterized in that: The metal sound absorbing and insulating plate (30) is installed on the wall steel structure (10) via through bolts (310); a steel pipe sleeve (311) is provided on the through bolts (310); when in use, the steel pipe sleeve (311) is located inside the metal sound absorbing and insulating plate (30), and pads (312) are provided at both ends of the steel pipe sleeve (311).

3. The soundproof enclosure for converter transformer with both pressure relief and explosion resistance according to claim 1 is characterized in that: A cooling fan (11) is provided at the front end of the wall steel structure (10), and the lightweight explosion-proof wall (400) is located behind the cooling fan (11).

4. The soundproof enclosure for converter transformer with both pressure relief and explosion resistance according to claim 1 is characterized in that: The adjustable pressure relief card (410) comprises a first adjustable pressure relief sub-card (411), a second adjustable pressure relief sub-card (412) and an adjustable pressure relief connecting sub-card (413); The two ends of the adjustable pressure relief connecting sub-card (413) are fixed to the first adjustable pressure relief sub-card (411) and the second adjustable pressure relief sub-card (412) in a stepped shape.

5. The sound insulation cover for converter transformer with both pressure relief and explosion resistance according to claim 1, characterized in that: The openable top cover plate (500) is formed by combining a plurality of openable top cover modules (50); wherein the top cover module (50) comprises a top cover module outer frame (51), an openable cover plate (52), a cover plate spring (53), and a fusible bolt (54); Wherein, a hole is provided in the middle of the top cover module outer frame (51); the openable cover plate (52) is located at the hole, and one side of the openable cover plate (52) is movably connected to the top cover module outer frame (51); The two ends of the cover plate spring (53) are respectively connected to the top cover module outer frame (51) and the openable cover plate (52); and the fusible bolt (54) passes through the cover plate spring (53) and is connected to the top cover module outer frame (51) and the openable cover plate (52).

6. The soundproof enclosure for converter transformer with both pressure relief and explosion resistance according to claim 5 is characterized in that: When the converter transformer operates normally, the fusible bolt (54) locks the openable cover plate (52), the openable cover plate (52) is in a closed state, and the cover plate spring (53) is in a compressed state; when a fire occurs in the converter transformer, the high temperature generated causes the fusible bolt (54) to be melted, the cover plate spring (53) pops open, and the openable cover plate (52) is pushed open, thereby achieving the purpose of opening the openable top cover plate (500).

7. The soundproof enclosure for converter transformer with both pressure relief and explosion resistance according to claim 5 is characterized in that: The top cover module (50) includes a fire extinguishing device; the fire extinguishing device includes a fire extinguishing tank (55), a hot melt switch (56), and a fire extinguishing pipe (57); The fire extinguishing tank (55) is integrated and fixed to a side surface of the top cover module outer frame (51) facing the converter transformer; the fire extinguishing pipe (57) is connected to the outlet of the fire extinguishing tank (55); The hot melt switch (56) comprises a switch spring (561), a switch connecting shaft (562), a hot melt locking bolt (563), and an internal pipe (564); A hot melt locking bolt (563) located outside the fire extinguisher tank (55) is connected to a switch connecting shaft (562), and the switch connecting shaft (562) passes through the switch spring (561) and is connected to the internal pipe (564); wherein a limit plate (565) is provided on the switch connecting shaft (562) to limit the elongation length of the switch spring (561); and the compression state of the switch spring (561) can be adjusted by adjusting the connection depth between the hot melt locking bolt (563) and the switch connecting shaft (562).

8. The soundproof enclosure for converter transformer with both pressure relief and explosion resistance according to claim 7 is characterized in that: The internal pipe (564) is located inside the fire extinguishing tank (55), and an opening is provided on the internal pipe (564), the opening facing the outlet of the fire extinguishing tank (55); by adjusting the compression state of the switch spring (561), the opening of the internal pipe (564) and the outlet of the fire extinguishing tank (55) are aligned or staggered.

9. The soundproof enclosure for converter transformer with both pressure relief and explosion resistance according to claim 8, characterized in that: When the converter transformer is in normal working condition, due to the locking effect of the hot melt locking bolt (563), the switch spring (561) is in a compressed state, the opening of the internal pipe (564) is offset from the outlet of the fire extinguishing tank (55), and the compressed air in the fire extinguishing tank (55) cannot spray the fire extinguishing agent through the fire extinguishing pipe (57); When a fire occurs in the converter transformer, the high temperature causes the hot melt locking bolt (563) to be melted, the switch spring (561) to expand, and at the same time, restricted by the limiting plate (565), the opening of the internal pipe (564) is aligned with the outlet of the fire extinguishing tank (55), and the compressed air in the fire extinguishing tank (55) sprays the fire extinguishing agent out through the fire extinguishing pipe (57).

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