Explosion-proof failure protection device and method

Abstract

The invention discloses an explosion-proof failure protection device and method. The explosion-proof failure protection device comprises a controllable valve, an oil outlet pipe, a first explosion-proof membrane and a second explosion-proof membrane. The controllable valve is provided with a valve oil inlet and a valve oil outlet, and the valve oil inlet is communicated with the oil outlet of the oil tank. The oil outlet pipe is provided with an oil pipe oil inlet which is communicated with the valve oil outlet. And the first explosion-proof membrane is packaged at the oil outlet of the valve. The second explosion-proof membrane is packaged at the oil inlet of the oil pipe, and a preset distance is reserved between the second explosion-proof membrane and the first explosion-proof membrane. And the oil liquid sensor is arranged between the second explosion-proof membrane and the first explosion-proof membrane. By arranging the controllable valve and the sensor, the controllable valve is controlled to be closed when it is judged that oil flows out due to failure and breakage of the first explosion-proof membrane according to detection information of the oil sensor, so that the oil tank is sealed again, oil is prevented from flowing out, the damaged first explosion-proof membrane is replaced, and the situation that the explosion-proof membrane cannot work normally at the critical moment is avoided.

Description

Technical Field

[0001] The present invention relates to the field of power equipment, and in particular to an explosion-proof failure protection device and method. Background Art

[0002] When high-voltage transformers and tap changers experience low-resistance faults, arc discharge phenomena will occur, resulting in the vaporization and cracking of insulating oil, instantaneously forming a large amount of high-temperature and high-pressure oil and gas, and then triggering a pressure shock. If the generated pressure cannot be released in time, the fuel tank will face the risk of deformation or rupture, which may further lead to more serious accidents, such as transformer fires or environmental pollution caused by transformer oil leakage. In addition, the high temperature generated by arc discharge is sufficient to ignite the insulating materials and oil inside the transformer, thus triggering a fire. The fire will not only cause further damage to the equipment, but also endanger the surrounding environment and personnel safety. To solve such problems, a pressure relief device based on a rupture disk can be used currently: A rupture disk is a type of fracture safety pressure relief device that can rapidly rupture under the rated bursting pressure and designed bursting temperature to play a pressure relief role. This device has advantages such as no leakage and rapid action, and is particularly suitable for occasions with high requirements for the pressure relief speed.

[0003] The explosion-proof diaphragm can rapidly rupture under the set pressure or temperature conditions, thereby quickly releasing the pressure inside the container and effectively preventing explosion accidents caused by overpressure. This rapid response mechanism is crucial for protecting the safety of equipment and personnel. In addition, the explosion-proof diaphragm can release a large amount of gas and heat, thereby significantly reducing the pressure and temperature inside the container and preventing the further expansion of explosion accidents. The existing explosion-proof diaphragm type pressure relief devices are mainly composed of components such as rupture disks (or rupture disk assemblies) and holders (or support rings). This device is usually designed as a non-reclosing pressure relief device, that is, once the rupture disk ruptures, a new rupture disk needs to be manually replaced to resume use.

[0004] Generally, when the explosion-proof membrane discharges oil and gas, it may come into contact with air and cause an explosion, further deepening the danger. In addition, although rupture disks will undergo strict testing and verification during design and manufacturing, they may still be affected by various factors during actual use, such as temperature, pressure fluctuations, and medium corrosion, thereby affecting their accuracy and stability. The decline in accuracy and stability may cause the equipment to fail to work properly at critical moments, thereby increasing the risk of safety accidents. Summary of the Invention

[0005] The present invention provides an explosion-proof failure protection device and method, which can avoid the explosion-proof membrane from failing to work properly at critical moments.

[0006] Embodiments of the present invention provide an explosion-proof failure protection device, including a controllable valve, an oil outlet pipe, a first explosion-proof film, and a second explosion-proof film. The controllable valve has a valve oil inlet and a valve oil outlet, and the valve oil inlet is communicated with the oil outlet of the fuel tank. The oil outlet pipe has an oil pipe inlet, and the oil pipe inlet is communicated with the valve oil outlet. The first explosion-proof film is encapsulated at the valve oil outlet. The second explosion-proof film is encapsulated at the oil pipe inlet, and the second explosion-proof film is spaced from the first explosion-proof film by a preset distance. An oil liquid sensor is arranged between the second explosion-proof film and the first explosion-proof film.

[0007] In some of these embodiments, the explosion-proof failure protection device further includes an oil discharge pipe. The oil discharge pipe communicates the oil pipe inlet with the valve oil outlet, and an oil liquid sensor is arranged in the oil discharge pipe.

[0008] In some of these embodiments, the oil discharge pipe has a central pipe section, the center line of the central pipe section extends horizontally, the inner diameter of the central pipe section is larger than the inner diameters of the valve oil outlet and the pipe inlet, and an oil liquid sensor is arranged at the upper part of the central pipe section.

[0009] In some of these embodiments, the explosion-proof failure protection device further includes an installation cage. The installation cage has an installation channel, the first explosion-proof film is installed in the installation channel, the installation channel has a channel oil inlet and a channel oil outlet, the channel oil inlet is installed at the valve oil outlet, the channel oil outlet is arranged in the oil discharge pipe, and an oil liquid sensor is arranged at the channel oil outlet.

[0010] In some of these embodiments, the explosion-proof failure protection device further includes a first flange and a valve flange. The first flange is installed at the first end of the oil discharge pipe. The valve flange is installed at the valve oil outlet, and the valve flange is connected to the first flange.

[0011] In some of these embodiments, the explosion-proof failure protection device further includes a second flange and an oil pipe flange. The second flange is installed at the second end of the oil discharge pipe. The oil pipe flange is installed at the oil pipe inlet, and the oil pipe flange is connected to the second flange.

[0012] In some of these embodiments, the second explosion-proof film is installed between the second flange and the oil pipe flange.

[0013] In some of these embodiments, the oil liquid sensor includes an oil liquid temperature sensor and / or an oil liquid flow rate sensor.

[0014] Embodiments of the present invention also provide a method using the above explosion-proof failure protection device, including the following steps: performing oil liquid detection between the first explosion-proof film and the second explosion-proof film. Judging whether the first explosion-proof film works normally according to the oil liquid detection information, and controlling the opening and closing of the controllable valve.

[0015] In some of these embodiments, it is determined whether the first explosion-proof membrane is working properly based on the oil detection information, and the controllable valve is controlled to open or close, including: determining whether the first explosion-proof membrane is working properly based on the oil temperature detection information and the oil flow rate detection information. If so, the controllable valve is kept open; if not, the controllable valve is controlled to close.

[0016] An explosion-proof failure protection device provided according to an embodiment of the present invention includes a controllable valve, an oil outlet pipe, a first explosion-proof membrane, and a second explosion-proof membrane. The controllable valve has a valve oil inlet and a valve oil outlet, and the valve oil inlet is communicated with the oil outlet of the fuel tank. The oil outlet pipe has an oil pipe oil inlet, and the oil pipe oil inlet is communicated with the valve oil outlet. The first explosion-proof membrane is encapsulated at the valve oil outlet. The second explosion-proof membrane is encapsulated at the oil pipe oil inlet, and the second explosion-proof membrane is spaced apart from the first explosion-proof membrane by a preset distance. An oil sensor is disposed between the second explosion-proof membrane and the first explosion-proof membrane. By providing the first explosion-proof membrane and the second explosion-proof membrane, the present invention realizes the normal pressure relief of the oil through the first explosion-proof membrane and the second explosion-proof membrane, and when the first explosion-proof membrane fails and ruptures, the second explosion-proof membrane prevents the oil from continuing to leak out. By providing the controllable valve and the sensor, when it is determined according to the detection information of the oil sensor that the first explosion-proof membrane fails and ruptures, causing the oil to flow out, the controllable valve is controlled to close, thereby re-sealing the fuel tank and preventing the oil from flowing out, so as to replace the damaged first explosion-proof membrane and avoid the explosion-proof membrane from failing to work properly at a critical moment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0018] Figure 1 is a schematic cross-sectional view of the device in the embodiment of the present invention;

[0019] Figure 2 is a schematic overall structure view of the device in the embodiment of the present invention;

[0020] Figure 3 is a schematic overall perspective view of the device in the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0022] Refer to Figures 1-3, an embodiment of the present invention provides an explosion-proof failure protection device, which may include a controllable valve 1, an oil outlet pipe 2, a first explosion-proof membrane 3, a second explosion-proof membrane 4, an oil liquid sensor 5, a control unit, an oil discharge pipe 6, a first flange 7, a valve flange 8, a second flange 9, a pipe flange 10, and an installation cage 11.

[0023] The controllable valve 1 has a valve oil inlet and a valve oil outlet. The centerlines of the valve oil inlet and the valve oil outlet can both extend horizontally. The valve oil inlet is communicated with the oil outlet of the fuel tank 12. The valve oil outlet is communicated with the oil outlet pipe 2. The controllable valve 1 can be an electric valve, and the type can be selected according to needs. For example, an automatic butterfly valve is used. The butterfly valve is convenient and quick to open and close, labor-saving, and has a small fluid resistance. Under the above conditions, when the controllable valve 1 is opened, the oil liquid can flow out of the fuel tank 12 from the controllable valve 1. When the controllable valve 1 is closed, the oil liquid cannot flow out of the fuel tank 12 from the controllable valve 1.

[0024] The oil outlet pipe 2 has an oil pipe inlet and an oil pipe outlet. The centerline of the oil pipe inlet can extend horizontally. The oil pipe inlet is communicated with the valve oil outlet. The inner diameter of the oil pipe inlet can be larger than the inner diameter of the valve oil outlet. The centerline of the oil pipe outlet can extend vertically. The oil pipe outlet can be communicated with the oil storage device. Under the above conditions, the oil outlet pipe 2 can receive the oil liquid flowing out of the controllable valve 1.

[0025] The first explosion-proof membrane 3 is encapsulated at the valve oil outlet. The first explosion-proof membrane 3 can be arranged vertically. The type of the first explosion-proof membrane 3 can be selected according to needs. For example, a cage-type explosion-proof membrane is adopted. The explosion-proof performance of the cage-type explosion-proof membrane is reliable and mature, and the impacts during pressure relief can cancel each other out, and the bolt load is small. Under the above conditions, normally the controllable valve 1 is in an open state, and during pressure relief, the oil liquid is normally pressure-relieved through the first explosion-proof membrane 3.

[0026] The second explosion-proof membrane 4 is encapsulated at the oil pipe inlet. The second explosion-proof membrane 4 is spaced from the first explosion-proof membrane 3 by a preset distance. The second explosion-proof membrane 4 can be arranged vertically. The type of the second explosion-proof membrane 4 can be selected according to needs. For example, it is composed of an explosion-proof membrane protective layer and a metal explosion-proof membrane, and the explosion-proof membrane protective layer and the metal explosion-proof membrane are fixed to the flange in sequence. Under the above conditions, during pressure relief, the oil liquid is normally pressure-relieved through the first explosion-proof membrane 3 and the second explosion-proof membrane 4. If the first explosion-proof membrane 3 fails and ruptures, the second explosion-proof membrane 4 prevents the oil liquid from continuing to leak, and the work is reliable.

[0027] The oil sensor 5 is arranged between the second explosion-proof membrane 4 and the first explosion-proof membrane 3. The oil sensor 5 may include an oil temperature sensor and / or an oil flow rate sensor. The type of the oil sensor 5 can be selected according to requirements. A tuning fork sensor is adopted. This type of sensor is easy to install, plug-and-play, and maintenance-free. Under the above conditions, the oil sensor 5 can detect whether there is oil between the second explosion-proof membrane 4 and the first explosion-proof membrane 3, and detect the oil information between the second explosion-proof membrane 4 and the first explosion-proof membrane 3, such as detecting the oil temperature detection information and the oil flow rate detection information, so as to be used to control the opening and closing of the controllable valve 1.

[0028] The control unit is communicatively connected to the oil sensor 5 and is control-connected to the controllable valve 1. Under the above conditions, if the oil sensor 5 detects oil, it can transmit the detection signal to the control unit. The control unit can judge whether the first explosion-proof membrane 3 is normal drainage according to signals such as the oil temperature and flow rate in the signal. If the control unit judges that the first explosion-proof membrane 3 is normal drainage, the controllable valve 1 is not closed; if the control unit judges that the first explosion-proof membrane 3 fails and ruptures, causing oil to flow out, the controller controls the controllable valve 1 to close, so as to re-seal the fuel tank 12, prevent the oil from flowing out, replace the damaged first explosion-proof membrane 3, and then work normally again.

[0029] The oil discharge pipeline 6 can connect the oil inlet of the oil pipe and the oil outlet of the valve. Under the above conditions, the oil discharge pipeline 6 provides a more sufficient connection space for the oil inlet of the oil pipe and the oil outlet of the valve, so that the distance between the first explosion-proof membrane 3 and the second explosion-proof membrane 4 is sufficient enough to accommodate more oil. An oil sensor 5 can be arranged in the oil discharge pipeline 6. Under the above conditions, the oil discharge pipeline 6 provides a stable installation environment for the oil sensor 5, so that the installation stability of the oil sensor 5 is higher. The center line of the oil discharge pipeline 6 can extend horizontally.

[0030] The oil discharge pipeline 6 can have a first end pipe section 61, a second end pipe section 63, and a center pipe section 62 connecting the first end pipe section 61 and the second end pipe section 63. The inner diameter of the first end pipe section 61 can be larger than the inner diameter of the oil outlet of the valve. Under the above conditions, the oil discharge pipeline 6 can be sleeved on the outer periphery of the oil outlet of the valve. The inner diameter of the second end pipe section 63 can be equal to the inner diameter of the oil inlet of the pipeline. Under the above conditions, the oil discharge pipeline 6 can be butted with the oil inlet of the oil pipe. The inner diameter of the center pipe section 62 can be larger than the inner diameter of the oil outlet of the valve and the inner diameter of the oil inlet of the pipeline. An arc transition can be provided between the center pipe section 62 and the first end pipe section 61 and the second end pipe section 63. The oil sensor 5 can be arranged on the upper part of the center pipe section 62. Under the above conditions, the center pipe section 62 provides a more stable installation environment for the oil sensor 5, so that the oil sensor 5 is avoided from the impact of oil and the impact damage of the oil sensor 5 is avoided.

[0031] The first flange 7 can be installed at the first end of the oil drainage pipe 6, and the first flange 7 is connected to the valve flange 8 through bolts and a sealing structure. Under the above conditions, the oil drainage pipe 6 is hermetically fixed to the controllable valve 1.

[0032] The valve flange 8 is installed at the valve oil outlet, and the valve flange 8 is connected to the first flange 7 through bolts and a sealing structure. Under the above conditions, the controllable valve 1 is hermetically fixed to the oil drainage pipe 6.

[0033] The second flange 9 is installed at the second end of the oil drainage pipe 6, and the second flange 9 is connected to the oil pipe flange 10 through bolts and a sealing structure. Under the above conditions, the oil drainage pipe 6 is hermetically fixed to the oil outlet pipe 2.

[0034] The oil pipe flange 10 is installed at the oil pipe inlet, and the oil pipe flange 10 is connected to the second flange 9 through bolts and a sealing structure. Under the above conditions, the oil outlet pipe 2 is hermetically fixed to the oil drainage pipe 6. The second explosion-proof membrane 4 can be installed between the second flange 9 and the oil pipe flange 10.

[0035] The inside of the oil drainage pipe 6 can be set to a vacuum or filled with an inert gas, and is set as a decompression chamber. Under the above conditions, the inert gas can prevent the high-temperature oil and gas from coming into contact with air and causing an explosion.

[0036] The installation cage 11 can have an installation channel. The first explosion-proof membrane 3 is installed in the installation channel. The installation channel has a channel oil inlet and a channel oil outlet. The channel oil inlet is installed at the valve oil outlet, and the channel oil outlet is arranged inside the oil drainage pipe 6. An oil liquid sensor 5 can be arranged at the channel oil outlet. Under the above conditions, the oil liquid sensor 5 can detect the oil liquid in a timely manner.

[0037] An embodiment of the present invention also provides a method using the above explosion-proof failure protection device, including the following steps:

[0038] Perform oil liquid detection between the first explosion-proof membrane 3 and the second explosion-proof membrane 4. Judge whether the first explosion-proof membrane 3 is working properly according to the oil liquid detection information, and control the opening and closing of the controllable valve 1.

[0039] Among them, judging whether the first explosion-proof membrane 3 is working properly according to the oil liquid detection information and controlling the opening and closing of the controllable valve 1 includes: judging whether the first explosion-proof membrane 3 is working properly according to the oil liquid temperature detection information and the oil liquid flow rate detection information. If so, keep the controllable valve 1 open. If not, control the controllable valve 1 to close.

[0040] In summary, by providing the first explosion-proof film 3 and the second explosion-proof film 4, the present invention enables the oil to be depressurized normally through the first explosion-proof film 3 and the second explosion-proof film 4, and when the first explosion-proof film 3 fails and ruptures, the second explosion-proof film 4 prevents the oil from leaking out continuously. By providing the controllable valve 1 and the sensor, when it is determined according to the detection information of the oil sensor 5 that the first explosion-proof film 3 fails and ruptures resulting in oil leakage, the controllable valve 1 is controlled to close, thereby resealing the fuel tank 12 to prevent the oil from flowing out, so as to replace the damaged first explosion-proof film 3 and avoid the explosion-proof film from failing to work properly at critical moments.

[0041] In the drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and cannot be construed as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An explosion-proof failure protection device, characterized in that: include: A controllable valve having a valve oil inlet and a valve oil outlet, wherein the valve oil inlet is connected to the oil outlet of the oil tank; An oil outlet pipe having an oil inlet, the oil inlet of the oil pipe being in communication with the oil outlet of the valve; A first explosion-proof membrane, encapsulated at the oil outlet of the valve; a second explosion-proof membrane, encapsulated at the oil inlet of the oil pipe, the second explosion-proof membrane being spaced apart from the first explosion-proof membrane by a preset distance; The oil sensor is arranged between the second explosion-proof membrane and the first explosion-proof membrane.

2. The explosion-proof failure protection device according to claim 1, characterized in that: Also includes: An oil discharge pipeline connects the oil inlet of the oil pipe with the oil outlet of the valve, and the oil sensor is arranged in the oil discharge pipeline.

3. The explosion-proof failure protection device according to claim 2, characterized in that: The oil discharge pipeline has a central pipe section, the center line of which extends horizontally, the inner diameter of which is larger than the inner diameter of the valve oil outlet and the inner diameter of the pipeline oil inlet, and the oil sensor is arranged on the upper part of the central pipe section.

4. The explosion-proof failure protection device according to claim 2, characterized in that: Also includes: The mounting cage has a mounting channel, the first explosion-proof membrane is installed in the mounting channel, the mounting channel has a channel oil inlet and a channel oil outlet, the channel oil inlet is installed at the valve oil outlet, the channel oil outlet is arranged in the oil discharge pipeline, and the oil sensor is arranged at the channel oil outlet.

5. The explosion-proof failure protection device according to claim 2, characterized in that: Also includes: a first flange mounted on a first end of the oil discharge pipeline; A valve flange is installed at the oil outlet of the valve, and the valve flange is connected to the first flange.

6. The explosion-proof failure protection device according to claim 2, characterized in that: Also includes: a second flange mounted on a second end of the oil discharge pipe; The oil pipe flange is installed at the oil inlet of the oil pipe, and the oil pipe flange is connected to the second flange.

7. The explosion-proof failure protection device according to claim 6, characterized in that: The second explosion-proof membrane is installed between the second flange and the oil pipe flange.

8. The explosion-proof failure protection device according to claim 1, characterized in that: The oil sensor includes an oil temperature sensor and / or an oil flow rate sensor.

9. A method using the explosion-proof failure protection device according to any one of claims 1 to 8, characterized in that: The following steps are involved: Performing oil detection between the first explosion-proof membrane and the second explosion-proof membrane; Whether the first explosion-proof membrane works normally is determined based on the oil detection information, and the opening and closing of the controllable valve is controlled.

10. The method according to claim 9, characterized in that According to the oil detection information, it is judged whether the first explosion-proof membrane is working normally, and the controllable valve is controlled to open and close, including: Whether the first explosion-proof membrane is working normally is judged according to the oil temperature detection information and the oil flow rate detection information. If so, the controllable valve is kept open; if not, the controllable valve is controlled to be closed.

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