Explosion-proof membrane failure protection device

Abstract

The invention relates to an explosion-proof membrane failure protection device which comprises an explosion-proof membrane, an explosion-proof membrane clamping mechanism, an oil discharging pipeline, a sensor, a sealing valve disc and a valve disc driving mechanism. Wherein an oil outlet is formed in the explosion-proof membrane clamping mechanism, the explosion-proof membrane is fixed on the explosion-proof membrane clamping mechanism to plug the oil outlet, and the explosion-proof membrane clamping mechanism is fixedly arranged at one end of the oil discharge pipeline; the sensor is used for detecting whether oil liquid of the transformer leaks or not and sending a signal to the valve disc driving mechanism when detecting that the oil liquid leaks; the sealing valve disc and the valve disc driving mechanism are arranged in the oil discharging pipeline, and the valve disc driving mechanism is used for driving the sealing valve disc to move to the explosion-proof membrane clamping mechanism to plug the oil outlet after receiving a signal sent by the sensor. The explosion-proof membrane failure protection device can be installed at the pressure relief opening of the transformer oil tank, the oil outlet of the explosion-proof membrane clamping mechanism is sealed again after the explosion-proof membrane fails, and it is guaranteed that a transformer can operate safely.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power equipment, and more specifically, to an explosion-proof membrane failure protection device. Background Art

[0002] When a high-voltage transformer or tap-changer has a low-resistance fault, arc discharge will occur, causing the insulating oil to vaporize and crack, instantly forming a large amount of high-temperature and high-pressure oil and gas, which will then trigger a pressure shock. If the pressure generated cannot be released in time, the oil tank will face the risk of deformation or rupture, which may lead to more serious accidents, such as transformer fire or environmental pollution caused by transformer oil leakage. In addition, the high temperature generated by the arc discharge is enough to ignite the insulating materials and oil inside the transformer, thus causing a fire. The fire will not only cause further damage to the equipment, but may also endanger the surrounding environment and personnel safety. To solve such problems, a pressure relief device based on an explosion-proof membrane can now be used: the explosion-proof membrane is a fracture-type safety pressure relief device that can quickly explode at the calibrated burst pressure and designed burst temperature to relieve pressure. This device has the advantages of no leakage and rapid action, and is particularly suitable for occasions with high requirements for pressure relief speed. The explosion-proof membrane can quickly rupture under the set pressure or temperature conditions, thereby quickly releasing the pressure in the container and effectively preventing explosion accidents caused by overpressure. This rapid response mechanism is crucial to protecting the safety of equipment and personnel. In addition, the explosion-proof membrane can release a large amount of gas and heat, thereby significantly reducing the pressure and temperature inside the container and preventing the explosion accident from further expanding.

[0003] In actual use, over time, the explosion-proof membrane material may age, causing its strength to decrease and crack. If the explosion-proof membrane is damaged or fails, it will not be able to effectively limit the pressure increase, increasing the risk of transformer explosion. In addition, the oil in the oil-immersed transformer plays an insulating and cooling role. The damage of the explosion-proof membrane will cause the oil to leak out of the explosion-proof pipe, which will not only reduce the oil volume of the transformer and affect its normal operation, but also pollute the environment. The failure of the explosion-proof membrane may also cause water and moisture to enter the transformer, which will cause the insulating oil to emulsify and reduce the insulation strength of the transformer, thereby affecting its safe operation. Summary of the invention

[0004] In view of this, an object of the present invention is to provide an explosion-proof membrane failure protection device, aiming to solve the problems existing in the prior art.

[0005] The present invention provides an explosion-proof membrane failure protection device, which comprises: an explosion-proof membrane, an explosion-proof membrane clamping mechanism, an oil discharge pipeline, a sensor, a sealing valve disc and a valve disc driving mechanism; wherein, The explosion-proof membrane clamping mechanism is provided with an oil outlet, the explosion-proof membrane is fixed on the explosion-proof membrane clamping mechanism to block the oil outlet, and the explosion-proof membrane clamping mechanism is fixed at one end of the oil discharge pipeline; The sensor is used to detect whether the oil of the transformer is leaking, and sends a signal to the valve disc drive mechanism when oil leakage is detected; The sealing valve disc and the valve disc driving mechanism are arranged in the oil discharge pipeline. The valve disc driving mechanism is used to drive the sealing valve disc to move to the explosion-proof membrane clamping mechanism to block the oil outlet after receiving the signal sent by the sensor.

[0006] Preferably, a locking mechanism is further included, and the locking mechanism is used to lock and fix the sealing valve disc and the explosion-proof membrane clamping mechanism when the sealing valve disc moves to the explosion-proof membrane clamping mechanism.

[0007] Preferably, the locking mechanism comprises a slot and a buckle, the slot is arranged on the explosion-proof membrane clamping mechanism, and the buckle is arranged on the sealing valve disc.

[0008] Preferably, the explosion-proof membrane clamping mechanism includes a base and an upper clamping plate, the oil outlet is correspondingly opened at the center of the base and the center of the upper clamping plate, the base is used to be connected to the oil tank of the transformer, the upper clamping plate is fixedly connected to the base by bolts, and the explosion-proof membrane is clamped and fixed between the upper clamping plate and the base.

[0009] Preferably, the explosion-proof membrane comprises a metal explosion-proof membrane and an explosion-proof membrane protective layer, and the metal explosion-proof membrane and the explosion-proof membrane protective layer are stacked on the base and clamped and fixed by the upper clamping plate.

[0010] Preferably, the valve disc driving mechanism comprises an airbag and a gas generator, and the gas generator is used to quickly inflate the airbag to make it expand.

[0011] Preferably, the sealing valve disc is slidably connected to the oil drain pipeline, the sealing valve disc can move axially along the oil drain pipeline, and the valve disc driving mechanism is arranged at one end of the oil drain pipeline away from the explosion-proof membrane clamping mechanism.

[0012] Preferably, a plurality of guide grooves are provided on the inner wall of the oil drain pipeline, and the guide grooves are extended along the axial direction of the oil drain pipeline. A plurality of guide sliders are correspondingly provided in the circumferential direction of the sealing valve disc, and the guide sliders match the guide grooves, and each of the guide sliders is slidably connected to the corresponding guide groove.

[0013] Preferably, a liquid outlet is provided on the pipe wall of the oil discharge pipeline, and a liquid outlet pipe connected with the liquid outlet is provided outside the oil discharge pipeline.

[0014] Preferably, a receiving box is provided on the pipe wall of the oil drain pipeline on one side close to the explosion-proof membrane clamping mechanism, the valve disc driving mechanism is arranged in the receiving box, the opening of the receiving box is located in the oil drain pipeline, the sealing valve disc is hinged at the opening of the receiving box, and the valve disc driving mechanism in the receiving box can drive the sealing valve disc to rotate to the explosion-proof membrane clamping mechanism to seal the oil outlet.

[0015] The explosion-proof membrane failure protection device provided by the present invention can transmit a signal to the valve disc driving mechanism when the sensor detects oil leakage after the explosion-proof membrane fails and ruptures, so that the valve disc driving mechanism drives the sealing valve disc to move to the explosion-proof membrane clamping mechanism to seal the oil outlet, thereby achieving re-sealing and ensuring the safe operation of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings.

[0017] Figure 1 A schematic diagram of the three-dimensional structure of an explosion-proof membrane failure protection device according to Embodiment 1 of the present invention is shown.

[0018] Figure 2 A schematic diagram of the internal structure of an explosion-proof membrane failure protection device according to Embodiment 1 of the present invention is shown.

[0019] Figure 3 Another internal structure schematic diagram of the explosion-proof membrane failure protection device according to the first embodiment of the present invention is shown.

[0020] Figure 4 A schematic diagram of the three-dimensional structure of an explosion-proof membrane failure protection device according to the second embodiment of the present invention is shown.

[0021] Figure 5 A schematic diagram of the internal structure of an explosion-proof membrane failure protection device according to Embodiment 2 of the present invention is shown.

[0022] In the figure: 1. explosion-proof membrane; 2. explosion-proof membrane clamping mechanism; 21. base; 22. upper clamping plate; 3. oil discharge pipeline; 31. guide groove; 32. liquid outlet; 33. liquid outlet pipe; 34. sealing plate; 4. sealing valve disc; 41. guide slider; 42. retaining ring; 5. airbag; 61. slot; 62. buckle; 7. storage box; 8. hinge. DETAILED DESCRIPTION

[0023] Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. In each of the accompanying drawings, the same elements are represented by the same or similar reference numerals. For the sake of clarity, the various parts in the accompanying drawings are not drawn to scale.

[0024] Embodiment 1: This embodiment provides a protection device for explosion-proof membrane failure. Figure 1 and Figure 2 The explosion-proof membrane failure protection device comprises: an explosion-proof membrane 1, an explosion-proof membrane clamping mechanism 2, an oil discharge pipeline 3, a sensor (not shown in the figure), a sealing valve disc 4 and a valve disc driving mechanism; wherein, the explosion-proof membrane clamping mechanism 2 is provided with an oil outlet, the explosion-proof membrane 1 is fixed on the explosion-proof membrane clamping mechanism 2 to block the oil outlet, and the explosion-proof membrane clamping mechanism 2 is fixed at one end of the oil discharge pipeline 3; the sensor is used to detect whether the oil of the transformer is leaking, and sends a signal to the valve disc driving mechanism when the oil leakage is detected; the sealing valve disc 4 and the valve disc driving mechanism are arranged in the oil discharge pipeline 3, and the valve disc driving mechanism is used to drive the sealing valve disc 4 to move to the explosion-proof membrane clamping mechanism 2 to block the oil outlet after receiving the signal sent by the sensor.

[0025] Specifically, the oil drain pipeline 3 is a circular steel pipe structure, and the explosion-proof membrane clamping mechanism 2 is arranged at one end of the oil drain pipeline 3. The explosion-proof membrane clamping mechanism 2 clamps and fixes the explosion-proof membrane 1 and is connected to the pressure relief port of the transformer oil tank. When the explosion-proof membrane 1 ruptures, the insulating oil in the transformer oil tank flows into the oil drain pipeline 3 through the pressure relief port and the oil outlet on the explosion-proof membrane clamping mechanism 2. The pipe wall of the oil drain pipeline 3 is also provided with a liquid outlet 32, and the outside of the oil drain pipeline 3 is provided with a liquid outlet pipe 33 connected to the liquid outlet 32, and the oil flowing into the oil drain pipeline 3 can be discharged through the liquid outlet pipe 33. The sensor can be an electrical sensor, using a flexible circuit. In specific implementation, electrodes can be set on both sides of the explosion-proof membrane 1. The circuit is not conductive under normal circumstances. When the explosion-proof membrane 1 is broken and the oil overflows, the electrodes of the sensor will be conductive. At this time, the sensor can transmit the signal to the valve disc drive mechanism, and the valve disc drive mechanism can drive the sealing valve disc 4 to move to the explosion-proof membrane clamping mechanism 2 to block the oil outlet to achieve re-sealing. In this embodiment, the sealing valve disc 4 is a circular structure that matches the inner diameter of the oil discharge pipeline 3, and it can move axially along the oil discharge pipeline 3. A sealing ring is set on the side of the sealing valve disc 4 facing the explosion-proof membrane clamping mechanism 2, so that when the sealing valve disc 4 moves to the explosion-proof membrane clamping mechanism 2 and contacts it, the contact surface of the two can be sealed by the sealing ring, so that when the sealing valve disc 4 blocks the oil outlet, the oil will not leak.

[0026] Furthermore, the explosion-proof membrane failure protection device also includes a locking mechanism, which is used to lock and fix the sealing valve disc 4 and the explosion-proof membrane clamping mechanism 2 when the sealing valve disc 4 moves to the explosion-proof membrane clamping mechanism 2. Specifically, the locking mechanism includes a slot 61 and a buckle 62, the slot 61 is arranged on the explosion-proof membrane clamping mechanism 2, and the buckle 62 is arranged on the sealing valve disc 4. In this embodiment, the number of the slots 61 and the buckle 62 are both six, the six slots 61 are fixedly connected to the end surface of the explosion-proof membrane clamping mechanism 2 facing the sealing valve disc 4, and the six slots 61 are evenly distributed along the circumference of the explosion-proof membrane clamping mechanism 2; the six buckles 62 are fixedly connected to the end surface of the sealing valve disc 4 facing the explosion-proof membrane clamping mechanism 2, and the six buckles 62 are evenly distributed along the circumference of the sealing valve disc 4, and the positions of each buckle 62 on the sealing valve disc 4 correspond to the positions of each slot 61 on the explosion-proof membrane clamping mechanism 2. When the valve disc driving mechanism pushes the sealing valve disc 4 to move onto the explosion-proof membrane clamping mechanism 2, each of the slots 61 of the locking mechanism can be engaged with the corresponding buckles 62, so that the sealing valve disc 4 and the explosion-proof membrane clamping mechanism 2 are locked and fixed together, and even if the valve disc driving mechanism loses the thrust of the sealing valve disc 4, the sealing valve disc 4 can still keep the oil outlet blocked. The slot 61 and buckle 62 structure in the attached figure is only an optional schematic locking structure. In specific implementation, other structural forms of the slot 61 and buckle 62 structure can also be used, such as a stepped symmetrical locking buckle structure.

[0027] Furthermore, the explosion-proof membrane clamping mechanism 2 includes a base 21 and an upper clamping plate 22, the oil outlet is correspondingly opened at the center of the base 21 and the center of the upper clamping plate 22, the base 21 is used to be connected to the oil tank of the transformer, the upper clamping plate 22 is fixedly connected to the base 21 by bolts, and the explosion-proof membrane 1 is clamped and fixed between the upper clamping plate 22 and the base 21. In specific implementation, screw holes can be set around the base 21, and the base 21 is fixedly connected to the pressure relief port of the transformer oil tank by bolts, so that the explosion-proof membrane 1 is aligned with the pressure relief port of the transformer oil tank to achieve sealing of the transformer oil tank.

[0028] The explosion-proof membrane 1 includes a metal explosion-proof membrane and an explosion-proof membrane protective layer, which are stacked on the base 21 and clamped and fixed by the upper clamping plate 22. Specifically, the explosion-proof membrane protective layer covers the explosion-proof membrane 1, and its function is to prevent the explosion-proof membrane 1 from being corroded, scratched, and other possible damages. The explosion-proof membrane protective layer can be made of materials such as polytetrafluoroethylene and fluorinated ethylene propylene.

[0029] The valve disc drive mechanism includes an airbag 5 and a gas generator (not shown in the figure), and the gas generator is used to quickly inflate the airbag 5 to expand it. In specific implementation, the structure of the airbag 5 and the gas generator can refer to the structure of the airbag 5 of the car. For example: after the gas generator receives the signal sent by the sensor, the internal ignition device is activated, and the ignition device will ignite solid fuels, such as sodium azide, etc. These fuels will quickly undergo chemical reactions after ignition to produce a large amount of high-temperature and high-pressure gas. The high-temperature and high-pressure gas generated by the gas generator is sprayed into the airbag 5 through a pipeline or directly. The airbag 5 is a flexible bag made of special materials that can withstand greater pressure. After the gas enters the airbag 5, it will quickly inflate the airbag 5, thereby pushing the sealing valve disc 4 to move to the explosion-proof membrane clamping mechanism 2 to achieve the blocking of the oil outlet.

[0030] Further, the sealing valve disc 4 is slidably connected to the oil drain pipeline 3, the sealing valve disc 4 can move along the axial direction of the oil drain pipeline 3, and the valve disc driving mechanism is arranged at one end of the oil drain pipeline 3 away from the explosion-proof membrane clamping mechanism 2. Specifically, a plurality of guide grooves 31 are arranged on the inner wall of the oil drain pipeline 3, and the guide grooves 31 are arranged to extend along the axial direction of the oil drain pipeline 3. A plurality of guide sliders 41 are arranged in the circumferential direction of the sealing valve disc 4, and the guide sliders 41 match the guide grooves 31. Each of the guide sliders 41 is slidably connected to the corresponding guide grooves 31. By arranging the guide grooves 31 in the oil drain pipeline 3 and the guide sliders 41 on the sealing valve disc 4, the sealing valve disc 4 will not produce circumferential rotation when sliding in the oil drain pipeline 3, thereby ensuring that each buckle 62 and the card slot 61 of the locking mechanism can always be aligned. In this embodiment, the guide slider 41 and the sealing valve disc 4 are an integrated structure, the number of the guide slider 41 and the guide slot is consistent with the number of the slot 61 and the buckle 62, and each buckle 62 on the sealing valve disc 4 is respectively arranged on each guide slider 41. In this embodiment, a retaining ring 42 is also arranged in the oil discharge pipeline 3, and the retaining ring 42 is used to limit the sealing valve disc 4. The initial position of the sealing valve disc 4 is abutting against the retaining ring 42. A sealing ring is also arranged at one end of the sealing valve disc 4 that contacts the retaining ring 42, and the sealing valve disc 4 can contact and seal with the retaining ring 42 at the initial position. A sealing plate 34 is arranged at one end of the oil discharge pipeline 3 away from the explosion-proof membrane clamping mechanism 2, and the valve disc driving mechanism is arranged on the sealing plate 34 and is located between the retaining ring 42 and the sealing plate 34.

[0031] To ensure the applicability of the sealing valve disc 4, the shape of the sealing valve disc 4 is selected according to the type of the explosion-proof membrane 1. For the reverse arched and flat-type explosion-proof membranes 1, the sealing valve disc 4 can be selected as a flat structure; for the positive arched explosion-proof membrane 1, the sealing valve disc 4 needs to change its shape accordingly to avoid interference with the explosion-proof membrane 1 when contacting the explosion-proof membrane clamping mechanism 2. Figure 3As shown, the explosion-proof membrane 1 is a positive arch explosion-proof membrane 1. In order to avoid the interference between the sealing valve disc 4 and the explosion-proof membrane 1 when sealing the oil outlet, a circular groove structure with a diameter greater than the diameter of the arched part of the explosion-proof membrane 1 and a depth greater than the height of the arched part of the explosion-proof membrane 1 is provided in the middle of the sealing valve disc 4.

[0032] Embodiment 2: like Figure 4 and Figure 5 As shown, the explosion-proof membrane failure protection device in this embodiment is different from that in the first embodiment in that: A receiving box 7 is provided on the pipe wall of the oil discharge pipeline 3 on one side close to the explosion-proof membrane clamping mechanism 2, the valve disc driving mechanism is provided in the receiving box 7, the opening of the receiving box 7 is located in the oil discharge pipeline 3, the sealing valve disc 4 is hinged at the opening of the receiving box 7 by a hinge 8, and the valve disc driving mechanism in the receiving box 7 can drive the sealing valve disc 4 to rotate to the explosion-proof membrane clamping mechanism 2 to block the oil outlet. In this embodiment, the oil discharge pipeline 3 is a rectangular tubular structure, and the end of the oil discharge pipeline 3 away from the explosion-proof membrane clamping mechanism 2 is an unclosed structure. When the explosion-proof membrane 1 is ruptured, the overflowed oil can flow out from the end of the oil discharge pipeline 3 away from the explosion-proof membrane clamping mechanism 2.

[0033] In summary, the explosion-proof membrane failure protection device provided by the present invention can, after the explosion-proof membrane fails and ruptures, transmit a signal to the valve disc driving mechanism when the sensor detects oil leakage, so that the valve disc driving mechanism drives the sealing valve disc to move to the explosion-proof membrane clamping mechanism to seal the oil outlet, thereby achieving re-sealing and ensuring the safe operation of the transformer.

[0034] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0035] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. An explosion-proof membrane failure protection device, characterized in that: include: explosion-proof membrane, explosion-proof membrane clamping mechanism, oil discharge pipeline, sensor, sealing valve disc and valve disc driving mechanism; wherein, The explosion-proof membrane clamping mechanism is provided with an oil outlet, the explosion-proof membrane is fixed on the explosion-proof membrane clamping mechanism to block the oil outlet, and the explosion-proof membrane clamping mechanism is fixed at one end of the oil discharge pipeline; The sensor is used to detect whether the oil of the transformer is leaking, and sends a signal to the valve disc drive mechanism when oil leakage is detected; The sealing valve disc and the valve disc driving mechanism are arranged in the oil discharge pipeline. The valve disc driving mechanism is used to drive the sealing valve disc to move to the explosion-proof membrane clamping mechanism to block the oil outlet after receiving the signal sent by the sensor.

2. The explosion-proof membrane failure protection device according to claim 1, characterized in that: It also includes a locking mechanism, which is used to lock and fix the sealing valve disc and the explosion-proof membrane clamping mechanism when the sealing valve disc moves to the explosion-proof membrane clamping mechanism.

3. The explosion-proof membrane failure protection device according to claim 2, characterized in that: The locking mechanism comprises a slot and a buckle, wherein the slot is arranged on the explosion-proof membrane clamping mechanism, and the buckle is arranged on the sealing valve disc.

4. The explosion-proof membrane failure protection device according to claim 1, characterized in that: The explosion-proof membrane clamping mechanism includes a base and an upper clamping plate. The oil outlet is correspondingly opened at the center of the base and the center of the upper clamping plate. The base is used to be connected to the oil tank of the transformer. The upper clamping plate is fixedly connected to the base by bolts. The explosion-proof membrane is clamped and fixed between the upper clamping plate and the base.

5. The explosion-proof membrane failure protection device according to claim 4, characterized in that: The explosion-proof membrane comprises a metal explosion-proof membrane and an explosion-proof membrane protective layer, and the metal explosion-proof membrane and the explosion-proof membrane protective layer are stacked on the base and clamped and fixed by the upper clamping plate.

6. The explosion-proof membrane failure protection device according to claim 1, characterized in that: The valve disc driving mechanism comprises an air bag and a gas generator, wherein the gas generator is used for rapidly inflating the air bag to make it expand.

7. The explosion-proof membrane failure protection device according to claim 1, characterized in that: The sealing valve disc is slidably connected to the oil drain pipeline, the sealing valve disc can move along the axial direction of the oil drain pipeline, and the valve disc driving mechanism is arranged at one end of the oil drain pipeline away from the explosion-proof membrane clamping mechanism.

8. The explosion-proof membrane failure protection device according to claim 7, characterized in that: A plurality of guide grooves are arranged on the inner wall of the oil drain pipeline, and the guide grooves are extended along the axial direction of the oil drain pipeline. A plurality of guide sliders are arranged correspondingly in the circumferential direction of the sealing valve disc, and the guide sliders match the guide grooves. Each of the guide sliders is slidably connected to the corresponding guide groove.

9. The explosion-proof membrane failure protection device according to claim 7, characterized in that: A liquid outlet is provided on the pipe wall of the oil discharge pipeline, and a liquid outlet pipe connected with the liquid outlet is arranged outside the oil discharge pipeline.

10. The explosion-proof membrane failure protection device according to claim 1, characterized in that: A accommodating box is arranged on the pipe wall of the oil discharge pipeline on one side close to the explosion-proof membrane clamping mechanism, the valve disc driving mechanism is arranged in the accommodating box, the opening of the accommodating box is located in the oil discharge pipeline, the sealing valve disc is hinged at the opening of the accommodating box, and the valve disc driving mechanism in the accommodating box can drive the sealing valve disc to rotate onto the explosion-proof membrane clamping mechanism to seal the oil outlet.

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