Shockproof dry-type transformer

Abstract

The present application relates to the technical field of dry-type transformers, in particular to a shockproof dry-type transformer, which comprises a transformer body, fans are installed on both sides of the transformer body, a bottom plate is installed at the bottom of the transformer body, a buffer seat is movably sleeved on the bottom plate, at least two buffer frames are fixedly installed in the buffer seat, a PCM heat absorption assembly is fixedly installed on the bottom plate between adjacent buffer frames, and the shockproof dry-type transformer further comprises a buffer rod and a transmission shaft. The PCM heat absorption assembly, the rack, the transmission shaft, the gear set and the buffer rod are arranged, on the one hand, to automatically drive the displacement of the sliding block when the temperature of the transformer body rises, reduce the included angle between the buffer rod and the connecting arm, improve the equivalent stiffness of the system, and effectively suppress the large swing under heavy load or earthquake; on the other hand, since the position of the bottom plate is changed by the movement of the sliding block, the through grooves on the baffle overlap with the air inlet, the cooling airflow speed is improved under the premise that the air volume of the fan is basically unchanged, the heat exchange at the bottom of the winding is strengthened, and passive heat dissipation enhancement is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of dry-type transformers, in particular to a shockproof dry-type transformer. BACKGROUND

[0002] Dry-type transformers are widely used in high-rise buildings, subways, data centers, hospitals and other places with high safety and reliability requirements due to their oil-free, fireproof and maintenance-free advantages.

[0003] At present, conventional dry-type transformers mostly use rigid installation or simple rubber pad damping methods. Although such schemes can isolate part of the high-frequency vibration, they lack sufficient energy dissipation capacity when encountering earthquakes or short-circuit electric power impact, which easily leads to iron core loosening, winding displacement and even insulation damage. In order to improve the anti-seismic performance, some products introduce hydraulic dampers or spring-damping composite support structures.

[0004] However, these shock absorption systems usually have fixed stiffness characteristics: if designed too "soft", although the vibration isolation effect is good, but under heavy load or high temperature, it is easy to cause large shaking; if designed too "hard", it cannot effectively filter daily vibration, and long-term operation may accelerate structural fatigue. SUMMARY

[0005] The purpose of the present application is to provide a shockproof dry-type transformer to solve the problems raised in the background.

[0006] To achieve the above purpose, the present application provides the following technical scheme:

[0007] A shockproof dry-type transformer, comprising a transformer body, a fan is installed on both sides of the transformer body, a bottom plate is installed at the bottom of the transformer body, a buffer seat is movably sleeved on the side of the bottom plate away from the transformer body, at least two buffer frames are fixedly installed in the buffer seat, a PCM heat absorption assembly is fixedly installed on the bottom plate between adjacent buffer frames, the PCM heat absorption assembly has an expansion end, and the shockproof dry-type transformer further comprises: a buffer rod, one end of the buffer rod is hingedly connected with the buffer frame, the other end of the buffer rod is rotatably installed with a sliding block, and the sliding block is threadedly installed on the buffer frame; a transmission shaft is rotatably installed in the buffer seat, a first gear and a second gear are installed on the transmission shaft, a rack is fixedly installed on the expansion end of the PCM heat absorption assembly and is in meshing connection with the first gear, and a third gear is installed on the buffer frame and is in meshing connection with the second gear.

[0008] Preferably, the buffer rod comprises a cylinder, a piston rod is slidably connected in the cylinder, one end of the piston rod protrudes out of the cylinder and is hingedly connected with the sliding block, the other end of the piston rod is connected with a sealing plug, a limiting plate is fixedly installed on the hingedly connected end of the piston rod and the sliding block, a first spring is sleeved on the piston rod, and the two ends of the first spring are in contact with the cylinder and the limiting plate respectively.

[0009] Preferably, the sealing plug is internally provided with a throttle hole, the throttle hole penetrates the sealing plug along the axial direction of the piston rod, and a valve plate group is arranged on the hole wall of one side of the throttle hole.

[0010] Preferably, the PCM heat absorption assembly comprises a sealed shell, a phase change material core is filled in the sealed shell, an expansion end cover is slidably connected to one side of the sealed shell, and the rack is fixedly connected to the expansion end cover.

[0011] Preferably, limit blocks are fixedly installed on two sides of the expansion end cover, a guide rod is fixedly installed on the bottom plate, the limit blocks are slidably connected to the guide rod, a second spring is sleeved on the guide rod, and two ends of the second spring are fixedly connected to the limit blocks and the side wall of the bottom plate respectively.

[0012] Preferably, a heat-conducting insulation layer is arranged between the sealed shell and the bottom plate.

[0013] Preferably, the buffer frame comprises mounting seats and connecting arms, the mounting seats are fixedly arranged on the opposite surfaces of the bottom plate and the buffer seat respectively, the connecting arms are hingedly connected to the mounting seats on two sides, and the connecting arms and the buffer rods form an X-shaped support structure.

[0014] Preferably, a lead screw is rotatably installed in the mounting seat on the buffer seat, and the sliding block is threadedly installed on the lead screw.

[0015] Preferably, an air inlet is formed in the side wall of the buffer seat, an air outlet is formed in the bottom plate, baffles are fixedly installed on the two sides of the bottom plate, and through grooves are formed in the baffles.

[0016] Compared with the prior art, the present application has the following advantages:

[0017] 1. The PCM heat absorption assembly, the rack, the transmission shaft, the gear set and the buffer rod are arranged, on the one hand, to automatically drive the sliding block to displace when the temperature of the transformer body rises, reduce the included angle between the buffer rod and the connecting arm, improve the equivalent stiffness of the system, and effectively suppress large-scale shaking under heavy load or earthquake; on the other hand, since the position of the bottom plate is changed by the movement of the sliding block, the through grooves on the baffles overlap with the air inlets, the cooling airflow speed is improved under the premise that the air volume of the fan is basically unchanged, the heat exchange at the bottom of the winding is strengthened, and passive heat dissipation enhancement is realized.

[0018] 2. The throttle hole and the valve plate group are arranged in the buffer rod, on the one hand, to allow the hydraulic oil to flow quickly under impact and compression, realize low-damping and rapid energy absorption, and protect the winding from instantaneous impact damage; on the other hand, to limit the flow rate of the oil during rebound, generate high-damping and slow resetting, effectively suppress residual oscillation, and balance the vibration isolation performance and anti-shaking stability. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0020] Figure 2 It is a schematic diagram of the internal structure of the buffer seat of the present application;

[0021] Figure 3 It is a schematic diagram of the buffer seat structure of the present application;

[0022] Figure 4 It is a schematic diagram of the buffer frame and buffer rod structure of the present application;

[0023] Figure 5 It is a schematic diagram of the PCM heat absorption assembly and transmission shaft structure in the buffer seat of the present application;

[0024] Figure 6 It is a schematic diagram of the PCM heat absorption assembly structure of the present application;

[0025] Figure 7 It is a schematic diagram of the buffer rod structure of the present application;

[0026] Figure 8 It is a schematic diagram of the sealing plug structure of the present application.

[0027] In the drawings, the components represented by each reference numeral are listed as follows:

[0028] 10, transformer body; 11, fan; 12, bottom plate; 121, air outlet; 13, guide rod; 14, baffle; 141, through groove;

[0029] 20, buffer seat; 21, buffer frame; 211, mounting seat; 212, connecting arm; 213, lead screw; 22, buffer rod; 221, cylinder barrel; 222, piston rod; 223, sealing plug; 224, throttle hole; 225, valve piece group; 226, first spring; 227, limiting plate; 23, sliding block; 24, third gear; 25, air inlet;

[0030] 30, PCM heat absorption assembly; 31, rack; 32, sealing shell; 33, core; 34, expansion end cover; 35, limiting block; 36, second spring; 37, heat-conducting insulation layer;

[0031] 40, transmission shaft; 41, first gear; 42, second gear. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0033] Example: Figure 1 - Figure 8 The illustrated shockproof dry-type transformer includes a transformer body 10. Fans 11 are installed on both sides of the transformer body 10 for forced cooling of the windings and core. A metal base plate 12 is installed at the bottom of the transformer body 10, serving both structural support and heat conduction functions. A buffer seat 20 is movably fitted onto the side of the base plate 12 facing away from the transformer body 10, with a vertical gap maintained between the base plate 12 and the buffer seat 20 to allow for slight displacement of the base plate 12 under impact. At least two buffer frames 21 are fixedly installed inside the buffer seat 20; preferably, the number of buffer frames 21 is two to four, with adjacent buffer frames 21... A PCM heat absorption assembly 30 is fixedly installed on the base plate 12. The PCM heat absorption assembly 30 has an expansion end and also includes: a buffer rod 22, one end of which is hinged to a buffer frame 21, and a slider 23 is rotatably installed on the other end of the buffer rod 22. The slider 23 is threaded onto the buffer frame 21; a drive shaft 40 is rotatably installed in the buffer seat 20, and a first gear 41 and a second gear 42 are installed on the drive shaft 40. A rack 31 that meshes with the first gear 41 is fixedly installed on the expansion end of the PCM heat absorption assembly 30, and a third gear 24 that meshes with the second gear 42 is installed on the buffer frame 21.

[0034] Under normal temperature and light load conditions, the transformer body 10 has a low load and a small winding temperature rise. The PCM heat absorption component 30 is in a solid state with stable volume. The rack 31 is fixed in position, the drive shaft 40 is stationary, the slider 23 maintains its initial position, and the overall stiffness of the buffer rod 22 is low, effectively isolating high-frequency vibrations from the ground. When the load suddenly increases or the ambient temperature rises, the heat from the winding is conducted to the base plate 12, the temperature of the PCM heat absorption component 30 rises, the phase change material melts and expands in volume, driving the rack 31 to move downward and drive the first gear 41 to rotate. This, in turn, drives the second gear 42 and the third gear 24 to rotate through the drive shaft 40, thereby changing the position of the slider 23 on the buffer frame 21. The displacement of the slider 23 forces the lower fulcrum of the buffer rod 22 to retract, and the equivalent stiffness of the system automatically increases, suppressing large swaying caused by thermal expansion or external disturbances.

[0035] Reference Figure 4 and Figure 7 - Figure 8, buffer rod 22 includes cylinder 221, cylinder 221 is slidingly connected with piston rod 222, one end of piston rod 222 extends out of cylinder 221 and is hinged with sliding block 23 to adapt to the change of installation angle and thermal deformation deflection, the other end of piston rod 222 is connected with sealing plug 223, sealing plug 223 is provided with sealing ring on the outer periphery, and is tightly combined with the inner wall of cylinder 221, so as to separate the inner cavity of cylinder 221 into rod cavity and rodless cavity, in particular, throttle hole 224 is formed in the inside of sealing plug 223, throttle hole 224 penetrates sealing plug 223 along the axial direction of piston rod 222, and valve plate group 225 is arranged on the hole wall of one side of throttle hole 224, valve plate group 225 is formed by a plurality of layers of elastic metal sheets, is fixed at one end in sealing plug 223, and can be opened and closed freely at the other end with the oil pressure difference, when the bottom plate 12 of transformer body 10 is pressed down due to impact, piston rod 222 is quickly compressed into cylinder 221, the oil pressure of rodless cavity is raised, valve plate group 225 is pushed to bend outward and open, hydraulic oil quickly flows into rod cavity through throttle hole 224 and the gap between valve plates, so as to realize low damping and rapid compression, when the impact ends and the system rebounds, piston rod 222 tries to extend outward after the external load is released, at this time, the oil pressure of rod cavity is raised, valve plate group 225 is forced to tightly contact the end face of throttle hole 224, the main flow path is closed, and hydraulic oil can only slowly return through the small channel of throttle hole 224, so as to generate high damping and slow rebound effect, effectively inhibit residual oscillation, further, limit plate 227 is fixedly installed on the hinged end of piston rod 222 and sliding block 23, first spring 226 is sleeved on piston rod 222, and the two ends of first spring 226 are respectively in contact with cylinder 221 and limit plate 227.

[0036] The inside of cylinder 221 is also filled with high viscosity index anti-wear hydraulic oil, and is provided with a compensation cavity for balancing the volume change caused by the movement of piston rod 222, so as to maintain the stability of system pressure.

[0037] Referring to Figure 3 and Figure 5 - Figure 6 , PCM heat absorption assembly 30 includes sealed shell 32, which is a hollow metal cavity with one end open, sealed shell 32 is filled with phase change material core 33, such as paraffin, one side of sealed shell 32 is slidingly connected with expansion end cover 34, expansion end cover 34 is provided with a sealing ring on the outer edge, and forms a dynamic sealing cooperation with the inner wall of sealed shell 32, so as to ensure that the phase change material does not leak during repeated expansion and contraction, rack 31 is fixedly connected with expansion end cover 34 and moves axially synchronously.

[0038] To further improve the motion stability and reset reliability, the two sides of the expansion end cover 34 are fixedly installed with limit blocks 35, and correspondingly, the bottom plate 12 is fixedly installed with guide rods 13, the limit blocks 35 are slidingly connected to the guide rods 13, so as to constrain the expansion end cover 34 to move linearly in the vertical direction only, prevent deflection or jamming, the guide rods 13 are sleeved with second springs 36, and the two ends of the second springs 36 are fixed to the limit blocks 35 and the side wall of the bottom plate 12 respectively.

[0039] When the PCM heat absorption assembly 30 is heated and expanded, the expansion end cover 34 moves downward against the elastic force of the second spring 36; when the temperature drops and the phase change material solidifies and shrinks, the second spring 36 provides a reset force to push the expansion end cover 34 back to the original position.

[0040] In addition, in order to balance the efficient heat conduction and electrical insulation safety, a heat-conducting insulation layer 37 is arranged between the sealed shell 32 and the bottom plate 12, and the heat-conducting insulation layer 37 can be a ceramic-filled silica gel gasket, a mica plate or other high-heat-conducting insulation grease.

[0041] During the operation of the transformer body 10, the heat generated by the winding is conducted to the PCM heat absorption assembly 30 through the bottom plate 12. When the temperature rises to the phase change point, the phase change material core 33 absorbs heat and melts and expands in volume, pushing the expansion end cover 34 to move downward along the guide rod 13, driving the rack 31 to drive the gear transmission mechanism, and then adjusting the support angle of the buffer rod 22; when the load decreases and the temperature drops, the second spring 36 assists the expansion end cover 34 to reset, and the system returns to the initial flexible state, and the whole process does not require external energy, realizing heat-driven, self-adaptive and reversible cycle response.

[0042] Referring to Figure 4 The buffer frame 21 includes mounting seats 211 and connecting arms 212, the mounting seats 211 are fixed to the opposite surfaces of the bottom plate 12 and the buffer seat 20 respectively, the two ends of the connecting arms 212 are hinged to the mounting seats 211 on the two sides, allowing a small angle deflection during the force process to adapt to the relative movement caused by the thermal expansion of the transformer body 10 or the earthquake displacement, and the connecting arms 212 and the buffer rod 22 form an X-shaped support structure.

[0043] Further, a lead screw 213 is rotatably installed in the mounting seat 211 on the buffer seat 20, and a sliding block 23 is threadedly installed on the lead screw 213, so that when the lead screw 213 rotates, the sliding block 23 moves linearly along the axial direction.

[0044] In addition, the side wall of the buffer seat 20 is provided with an air inlet 25, and further, a wind collecting hood is installed outside the fan 11, and a flexible air pipe is connected between the wind collecting hood and the buffer seat 20 for introducing cooling air, and the bottom plate 12 is provided with an air outlet 121, so that the airflow passes through the core window and the winding air duct from bottom to top, and further, the two sides of the bottom plate 12 are fixedly installed with baffles 14, and the baffles 14 are provided with through grooves 141.

[0045] In the normal temperature and light load state, the natural heat exchange is realized through the air inlet 25 and the air outlet 121. When the load suddenly increases or the ambient temperature rises, the through groove 141 on the baffle 14 overlaps the air inlet 25 due to the movement of the slider 23 to change the position of the bottom plate 12. Under the premise that the air volume of the fan 11 is basically unchanged, the cooling airflow speed is improved, and the heat exchange at the bottom of the winding is strengthened.

[0046] Working principle: In the normal temperature or light load working condition, the winding generates small heat, the PCM heat absorption assembly 30 is in a solid state, the volume is stable, the rack 31 position is fixed, and the transmission shaft 40 and the slider 23 remain in the initial state. At this time, the buffer rod 22 and the connecting arm 212 form a larger X-shaped support with an angle, the overall stiffness of the system is low, the ground high-frequency vibration is effectively isolated, the cooling airflow enters smoothly through the air inlet 25 and the through groove 141 on the baffle 14, and natural heat exchange is realized.

[0047] When the load suddenly increases or the ambient temperature rises, the winding heat is conducted to the PCM heat absorption assembly 30 through the bottom plate 12, the phase change material core 33 absorbs heat and expands in volume, the expansion end cover 34 is driven to move downward along the guide rod 13, and the rack 31 is driven to move. The first gear 41 is driven to rotate, the second gear 42 and the third gear 24 are linked through the transmission shaft 40, and finally the lead screw 213 is rotated, the slider 23 is driven to move inward along the axial direction, and the displacement of the slider 23 forces the lower support of the buffer rod 22 to move closer to the center, so that the angle between the buffer rod 22 and the connecting arm 212 is reduced, and the equivalent stiffness of the system is automatically increased, thereby effectively suppressing the large shaking caused by thermal expansion, electromagnetic force or earthquake disturbance. At the same time, the valve plate group 225 in the buffer rod 22 and the throttle hole 224 cooperate to realize the asymmetric damping characteristics of fast compression and slow rebound, quickly absorb impact energy and suppress residual oscillation.

[0048] At the same time, the bottom plate 12 sinks slightly due to the change of the support angle, drives the baffle 14 to move synchronously, and makes the through groove 141 on the baffle 14 form a smaller effective flow cross section with the air inlet 25 on the sidewall of the buffer seat 20. Under the premise that the air volume of the fan 11 is basically constant, according to the principle of fluid continuity, the cooling airflow speed is significantly improved, the convective heat exchange of the key area at the bottom of the winding is strengthened, and the temperature rise rate is delayed.

[0049] When the load decreases and the temperature falls, the PCM solidifies and shrinks, the second spring 36 provides a restoring force to push the expansion end cover 34 and the rack 31 back to the original position, the slider 23 moves reversely, the system returns to the initial flexible state, and the complete closed-loop response is completed.

[0050] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is not intended to exclude myriad other embodiments of the present application that other inventors can develop based on the same general inventive concepts embodied by the described embodiments. That is, although the present application is described in terms of particular embodiments and illustrative figures, it should be apparent that the scope of the present application is not limited to these specific embodiments.

[0051] While the embodiments of the application have been shown and described herein, it will be understood by those skilled in the art that many changes, modifications, substitutions and alterations to these embodiments can be made without departing from the principles and spirits of the application, and it is intended that the scope of the application be limited solely by the scope of the appended claims and the equivalents thereof.

Claims

1. A shockproof dry-type transformer comprising a transformer body (10), a fan (11) is installed on both sides of the transformer body (10), characterized in that: The transformer body (10) bottom is provided with a bottom plate (12), one side of the bottom plate (12) away from the transformer body (10) is movably sleeved with a buffer seat (20), at least two buffer frames (21) are fixedly installed in the buffer seat (20), a PCM heat absorption assembly (30) is fixedly installed on the bottom plate (12) between the adjacent buffer frames (21), the PCM heat absorption assembly (30) has an expansion end, and the transformer body (10) further comprises: A buffer rod (22) is hingedly connected to one end of the buffer frame (21), and a sliding block (23) is rotatably installed on the other end of the buffer rod (22), and the sliding block (23) is threadedly installed on the buffer frame (21); A transmission shaft (40) is rotatably installed in the buffer seat (20), the transmission shaft (40) is provided with a first gear (41) and a second gear (42), the expansion end of the PCM heat absorption assembly (30) is fixedly installed with a rack (31) which is in meshing connection with the first gear (41), and the buffer frame (21) is provided with a third gear (24) which is in meshing connection with the second gear (42); The buffer rod (22) comprises a cylinder (221) and a piston rod (222) which is slidably connected to the cylinder (221), one end of the piston rod (222) extends out of the cylinder (221) and is hingedly connected to the sliding block (23), the other end of the piston rod (222) is connected with a sealing plug (223), a limiting plate (227) is fixedly installed on the hingedly connected end of the piston rod (222), a first spring (226) is sleeved on the piston rod (222), and the two ends of the first spring (226) are in contact with the cylinder (221) and the limiting plate (227) respectively; The PCM heat absorption assembly (30) comprises a sealed shell (32), the sealed shell (32) is filled with a phase change material core (33), and the expansion end cover (34) is slidably connected to one side of the sealed shell (32); the rack (31) is fixedly connected with the expansion end cover (34); Limiting blocks (35) are fixedly installed on the two sides of the expansion end cover (34), a guide rod (13) is fixedly installed on the bottom plate (12), the limiting blocks (35) are slidably connected to the guide rod (13), a second spring (36) is sleeved on the guide rod (13), and the two ends of the second spring (36) are fixedly connected with the limiting blocks (35) and the side wall of the bottom plate (12) respectively; The buffer frame (21) comprises a mounting seat (211) and a connecting arm (212), the mounting seats (211) are fixedly arranged on the opposite sides of the bottom plate (12) and the buffer seat (20) respectively, the connecting arm (212) is hingedly connected to the mounting seats (211) on the two sides, and the connecting arm (212) and the buffer rod (22) form an X-shaped support structure.

2. A shock proof dry-type transformer as claimed in claim 1, wherein: A throttle hole (224) is formed in the sealing plug (223), the throttle hole (224) penetrates the sealing plug (223) along the axial direction of the piston rod (222), and a valve piece group (225) is arranged on the hole wall of one side of the throttle hole (224).

3. A shock proof dry-type transformer as claimed in claim 1, wherein: A heat-conducting insulating layer (37) is arranged between the sealing shell (32) and the bottom plate (12).

4. The shock resistant dry-type transformer of claim 1, wherein: A mounting seat (211) is arranged on the buffer seat (20), a lead screw (213) is rotatably arranged in the mounting seat (211), and the sliding block (23) is threadedly arranged on the lead screw (213).

5. A shock proof dry-type transformer as claimed in claim 1, wherein: A side wall of the buffer seat (20) is provided with an air inlet (25), the bottom plate (12) is provided with an air outlet (121), both sides of the bottom plate (12) are fixedly provided with a baffle (14), and the baffle (14) is provided with a through groove (141).

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