Combustible gas collecting box of transformer

Abstract

The invention discloses a combustible gas collecting box for a transformer, which comprises a box body and a controller, a detection cavity, a gas taking cavity and a waste oil cavity are sequentially arranged in the box body from top to bottom, a first floater is arranged in the gas taking cavity, a second floater is arranged in the waste oil cavity, and a test assembly is also arranged in the box body. The state of the combustible gas collection box of the transformer is judged through the first floater arranged in the gas cavity and the second floater arranged in the waste oil cavity, so that opening and closing of the exhaust electromagnetic valve and the oil-gas electromagnetic valve are controlled, separation of an oil-gas mixture in the gas collection cavity is achieved, gas detection is effectively achieved through the hydrogen sensor and the acetylene sensor, and the detection efficiency is improved. The detection process is controlled by the controller, the automation degree is high, the operation is simple, the working efficiency is high, and the market demand can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer protection, and particularly to a combustible gas collecting box for a transformer. Background Art

[0002] The gas relay is an important safety protection device on an oil-immersed transformer. It is installed on the connecting pipe between the transformer tank cover and the conservator. Under the action of the gas or oil flow generated by an internal fault of the transformer, it connects the signal or trip circuit, so that the relevant device issues an alarm signal or removes the transformer from the power grid to achieve the function of protecting the transformer. In order to facilitate personnel to observe the gas volume inside the gas relay and handle and monitor the relevant gas, a collecting box is needed to lead the gas in the gas relay to below the transformer, so as to take gas and exhaust gas manually. During the gas-taking process, some transformer oil also needs to be discharged.

[0003] There is information showing that currently, the traditional collecting box adopts a manual operation method, using the static oil pressure in the transformer conservator for gas conduction and gas-taking. During the operation, the gas volume and oil level in the collecting box are observed manually. However, the operation process of operating the collecting box manually is complex, the work efficiency is low, and the degree of automation is low, which cannot meet the market demand.

[0004] Chinese Patent Document CN114121428A discloses a "collecting box and transformer applied to a transformer oil tank". The transformer is provided with an oil tank, the oil tank is connected with a collecting box, the collecting box is provided with a first gas collecting chamber, a second gas collecting chamber and a control module, a gas pumping module is arranged between the first gas collecting chamber and the second gas collecting chamber, the gas pumping module is respectively communicated with the first gas collecting chamber and the second gas collecting chamber, the gas pumping module pumps the gas in the first gas collecting chamber into the second gas collecting chamber, the first gas collecting chamber is connected with a pressure detection module, an alarm device is arranged in the pressure detection module, a telescopic piston is arranged in the second gas collecting chamber, the second gas collecting chamber is connected with a gas detection sensor for detection, an exhaust valve for exhausting gas is arranged in the second gas collecting chamber, and the control module is simultaneously connected with the gas pumping module, the pressure detection module and the gas detection sensor, which can improve the service life of the transformer. The above technical solution requires manual operation and manual observation during the operation process, with low efficiency and easy to generate errors. Summary of the Invention

[0005] The present invention mainly solves the technical problem that the original technical solution requires manual operation and manual observation during the operation process, with low efficiency and easy to generate errors. It provides a combustible gas collecting box for a transformer. By respectively setting a first float in the gas chamber and a second float in the waste oil chamber to judge the state of the combustible gas collecting box for the transformer, the opening and closing of the exhaust solenoid valve and the oil-gas solenoid valve are controlled, so as to realize the separation of the oil-gas mixture in the gas extraction chamber. The gas detection is effectively realized through a hydrogen sensor and an acetylene sensor. The detection process is controlled by a controller, with high automation, simple operation, high working efficiency, and can meet the market demand.

[0006] The above technical problem of the present invention is mainly solved by the following technical solution: The present invention includes a box body and a controller. Inside the box body, a detection chamber, a gas extraction chamber, and a waste oil chamber are sequentially arranged from top to bottom. The gas extraction chamber is connected to the gas relay on the transformer through an oil-gas input pipe. The gas extraction chamber is connected to the waste oil chamber through a waste oil pipe. A first float is arranged in the gas extraction chamber, and a second float is arranged in the waste oil chamber. The top of the gas extraction chamber is connected to the top of the waste oil chamber through an exhaust pipe. A test component is also arranged inside the box body.

[0007] A controller is arranged inside the box body. Inside the box body, a detection chamber, a gas extraction chamber, and a waste oil chamber are sequentially arranged from top to bottom. The controller is located in the detection chamber. The gas extraction chamber is connected to the gas relay on the transformer through an oil-gas input pipe. The oil-gas mixture in the gas relay will enter the gas extraction chamber through the oil-gas input pipe. An oil-gas solenoid valve is arranged on the oil-gas input pipe. A waste oil pipe is arranged between the gas extraction chamber and the waste oil chamber. A waste oil solenoid valve is arranged on the waste oil pipe. A first float is arranged in the gas extraction chamber, and a second float is arranged in the waste oil chamber. The upper part of the gas extraction chamber is communicated with the upper part of the waste oil chamber through an exhaust pipe. An exhaust solenoid valve is arranged on the exhaust pipe. An exhaust port is arranged on the side wall of the waste oil chamber. An acetylene sensor is arranged inside the box body. The acetylene sensor and the upper part of the gas extraction chamber are respectively communicated with an intake pipe and an outlet pipe. An intake solenoid valve and an air pump are arranged on the intake pipe. An outlet solenoid valve is arranged on the outlet pipe. A hydrogen sensor is also arranged between the detection chamber and the gas extraction chamber. The gas relay, the oil-gas solenoid valve, the exhaust solenoid valve, the intake solenoid valve, the air pump, the outlet solenoid valve, the first float, the second float, the acetylene sensor, and the hydrogen sensor are all electrically connected to the controller. The controller, the hydrogen sensor, the acetylene sensor, and each solenoid valve are all existing devices. When the entire collecting box is running specifically, it is divided into initial, action, intake, detection, and evacuation states. A guide rod is arranged inside the box body and is matched with the first float and the second float. A guide rod is arranged inside the box body and is matched with the first float and the second float. The arrangement of the guide rod can ensure the stability of the first float and the second float when rising or falling, prevent the first float or the second float from deviating from its position, and ensure the accuracy of the data.

[0008] When in the initial state, all solenoid valves are in the closed state. The controller determines whether the first float is at the top. If the first float is not at the top, the exhaust solenoid valve and the oil-gas solenoid valve are activated. The oil-gas mixture in the gas relay will enter the gas collection chamber through the oil-gas input pipe, and then the oil-gas mixture will accumulate in the gas collection chamber and drive the first float to rise. And the gas in the gas collection chamber will flow out from the exhaust port after passing through the exhaust pipe. When the first float rises to the top, the exhaust solenoid valve and the oil-gas solenoid valve are closed, waiting for the next operation; Next, it enters the action state. At this time, it is necessary to wait for whether there is a light gas action in the gas relay. If there is a light gas action, it enters the intake state, and the oil-gas solenoid valve and the waste oil solenoid valve are opened. The oil in the oil-gas mixture in the gas collection chamber will enter the waste oil chamber through the waste oil pipe, and the gas in the oil-gas mixture still remains in the gas collection chamber. Subsequently, the second float rises and the first float descends. When the first float descends to the set position, the oil-gas solenoid valve and the waste oil solenoid valve are closed, and the first float is then stable; Next, it enters the detection state. The air pump is turned on for air circulation, and the acetylene sensor is activated for detection. The air collection value is recorded as the detection base value. After recording, the intake solenoid valve and the outlet solenoid valve are opened, and the gas in the gas collection chamber is pumped out by the air pump. The hydrogen sensor and the acetylene sensor are activated for gas detection. After the detection is completed, the air pump, the intake solenoid valve, and the outlet solenoid valve are closed; Finally, it enters the evacuation state. The oil-gas solenoid valve and the exhaust solenoid valve are opened. The oil-gas mixture in the gas relay will continue to flow into the gas collection chamber. Then, after the first float rises to the top, the oil-gas solenoid valve and the exhaust solenoid valve are closed, and then the state of the second float is checked to determine whether it is necessary to manually empty the oil in the waste oil chamber; The entire detection process is controlled by the controller, with high automation, simple operation, high work efficiency, and can meet the market demand.

[0009] Preferably, an oil-gas solenoid valve is provided on the oil-gas input pipe, a waste oil solenoid valve is provided on the waste oil pipe, and an exhaust solenoid valve is provided on the exhaust pipe.

[0010] Preferably, the test assembly includes an acetylene sensor. The acetylene sensor and the upper part of the gas collection chamber are respectively connected with an intake pipe and an outlet pipe. An intake solenoid valve and an air pump are provided on the intake pipe, and an outlet solenoid valve is provided on the outlet pipe. Enter the detection state, turn on the air pump for air circulation, activate the acetylene sensor for detection, record the air collection value as the detection base value. After recording, open the intake solenoid valve and the outlet solenoid valve, pump out the gas in the gas collection chamber by the air pump, activate the hydrogen sensor and the acetylene sensor for gas detection. After the detection is completed, turn off the air pump, the intake solenoid valve, and the outlet solenoid valve.

[0011] Preferably, the test component further includes a hydrogen sensor, which is arranged between the detection chamber and the air extraction chamber. The gas in the air extraction chamber is extracted by an air pump, and the hydrogen sensor and the acetylene sensor are activated for gas detection. After the detection is completed, the air pump, the intake electromagnetic valve, and the exhaust electromagnetic valve are closed.

[0012] Preferably, an oil drain pipe is connected to the bottom of the waste oil chamber, and an oil drain valve is arranged on the oil drain pipe. An oil drain pipe is connected to the bottom of the waste oil chamber, and an oil drain valve is arranged on the oil drain pipe. When the staff opens the oil drain valve, the remaining oil in the waste oil chamber can be manually drained.

[0013] Preferably, an oil discharge bottom plate is arranged at the bottom of the waste oil chamber. An oil discharge groove is arranged on the oil discharge bottom plate. An oil discharge plate is slidably connected in the oil discharge groove. An oil discharge spring is connected between the bottom of the oil discharge plate and the bottom surface of the oil discharge groove. An oil discharge channel is arranged in the oil discharge bottom plate. One end of the oil discharge channel communicates with the oil discharge groove and cooperates with the oil discharge plate, and the other end of the oil discharge channel extends to the outside of the box body.

[0014] An oil discharge bottom plate is arranged at the bottom of the waste oil chamber. An oil discharge groove is arranged on the oil discharge bottom plate. An oil discharge plate is slidably connected in the oil discharge groove. An oil discharge spring is connected between the bottom of the oil discharge plate and the bottom surface of the oil discharge groove. An oil discharge channel is arranged in the oil discharge bottom plate. One end of the oil discharge channel communicates with the oil discharge groove and cooperates with the oil discharge plate, and the other end of the oil discharge channel extends to the outside of the box body. The oil discharge plate can block the oil discharge channel when not moving. When there is too much oil in the waste oil chamber, the pressure of the oil will overcome the spring force of the oil discharge spring and press down the oil discharge plate, causing the oil discharge plate to slide in the oil discharge groove. As the oil discharge plate moves, the oil discharge channel will communicate with the oil discharge groove, so that the oil in the waste oil chamber will flow into the oil discharge channel and then be discharged outside the box body, thus playing an automatic oil discharge role when there is more oil in the waste oil chamber.

[0015] Preferably, a blocking oil and gas balloon cooperating with the oil discharge channel is arranged at one end of the oil discharge plate. A blocking oil and gas balloon cooperating with the oil discharge channel is arranged at one end of the oil discharge plate. The blocking oil and gas balloon has good elasticity and can play a good role in blocking the oil discharge channel. When there is less oil in the waste oil chamber, the oil will not flow out from the oil discharge channel.

[0016] Preferably, a sealing oil plate is connected to the side wall of the oil discharge channel near one end of the oil discharge tank through a sealing oil torsion spring, and the sealing oil plate cooperates with the oil blocking air bag. A sealing oil plate that cooperates with the oil blocking air bag is connected to the side wall of the oil discharge channel near one end of the oil discharge tank through a sealing oil torsion spring. Under the action of the sealing oil torsion spring, the sealing oil plate will tilt outwards and abut against the oil blocking air bag. When the oil in the waste oil chamber is less, the oil discharge plate will drive the oil blocking air bag to move to the corresponding oil discharge channel under the action of the oil discharge spring. The oil blocking air bag will drive the sealing oil plate to move after overcoming the elastic force of the sealing oil torsion spring and make the sealing oil plate abut against the port of the oil discharge channel, so that the oil blocking air bag and the sealing oil plate cooperate to block the oil discharge channel and prevent accidental oil leakage. When the oil in the waste oil chamber is too much and drives the oil discharge plate to move and start automatic oil discharge, the sealing oil plate will press on the oil blocking air bag under the action of the sealing oil torsion spring, facilitating the discharge of oil.

[0017] Preferably, a plurality of oil discharge springs are provided, and the plurality of oil discharge springs are evenly distributed at the bottom of the oil discharge plate. The multiple oil discharge springs are evenly distributed at the bottom of the oil discharge plate, so that the oil discharge plate is evenly stressed and there will be no uncontrollable oil leakage phenomenon.

[0018] Preferably, a drain pipe is connected to the end of the oil discharge channel far from the oil discharge tank. The drain pipe can play a certain role in guiding the waste oil and divert the waste oil to an external collection box or a specific position.

[0019] The beneficial effects of the present invention are as follows: By respectively setting a first float in the air chamber and a second float in the waste oil chamber to judge the state of the combustible gas collection box of the transformer, the opening and closing of the exhaust solenoid valve and the oil and gas solenoid valve are controlled, so as to realize the separation of the oil and gas mixture in the gas extraction chamber. The gas detection is effectively realized through the hydrogen sensor and the acetylene sensor. The detection process is controlled by the controller, with high automation, simple operation, high working efficiency, and can meet the market demand. Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of the present invention.

[0021] Figure 2 is a partial enlarged view of the present invention.

[0022] In the figure: 1. box body, 2. gas relay, 3. controller, 4. waste oil chamber, 41. oil drain groove, 42. oil drain plate, 43. oil drain spring, 44. oil drain channel, 45. oil drain pipe, 46. oil drain bottom plate, 47. oil and gas blocking airbag, 48. oil sealing torsion spring, 49. oil sealing plate, 5. gas extraction chamber, 6. exhaust port, 7. acetylene sensor, 8. waste oil pipe, 81. waste oil solenoid valve, 9. exhaust pipe, 91. exhaust solenoid valve, 10. oil and gas input pipe, 101. oil and gas solenoid valve, 11. intake pipe, 111. intake solenoid valve, 112. air pump, 12. outlet pipe, 121. outlet solenoid valve, 13. hydrogen sensor, 141. oil drain pipe, 142. oil drain valve, 15. first float, 16. second float, 17. detection chamber, 18. guide rod. Detailed implementation manners

[0023] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the following further elaborates on the technical solutions of the present invention through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific implementation manners described herein are only one of the best embodiments of the present invention, which is only used to explain the present invention and does not limit the protection scope of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0024] A gas relay, also known as a gas actuated relay, is a component that uses the hot oil flow and hot gas flow generated during a fault in a transformer to drive the relay to operate, and it is a protection component of the transformer; the gas relay is installed in the pipeline between the conservator and the oil tank of the transformer; if a discharge fault occurs inside the oil-filled transformer, the discharge arc decomposes the transformer oil, generating various characteristic gases such as methane, acetylene, hydrogen, carbon monoxide, carbon dioxide, ethylene, and ethane. The more serious the fault, the greater the amount of gas. After these gases are generated, they rise from the inside of the transformer to the upper conservator and flow through the gas relay during the process; if the amount of gas is small, the gas accumulates inside the gas relay, causing the float to descend, closing the normally open contact of the relay, and acting on the light gas protection to issue a warning signal; if the amount of gas is very large, the oil and gas quickly rush out through the gas relay, pushing the baffle inside the gas relay to act, closing another set of normally open contacts, and the heavy gas directly starts the relay protection to trip, disconnecting the circuit breaker and cutting off the faulty transformer.

[0025] Since the transformer gas relay is usually installed on the connecting pipe between the conservator and the transformer oil tank, above the transformer oil tank, after the relay alarms or operates, in order to facilitate personnel to observe the gas capacity inside the gas relay and handle and monitor the relevant gas, a gas collection box is required to lead the gas inside the gas relay to below the transformer, so as to manually collect and exhaust gas, and part of the transformer oil also needs to be discharged during the gas collection process.

[0026] Currently, traditional gas collection boxes all adopt manual operation methods, using the static oil pressure in the transformer conservator for gas conduction and gas extraction. During the operation process, the amount of gas and the oil level in the gas collection box are observed manually. However, the operation process of the gas collection box through manual operation is complex, with low work efficiency and low automation level, unable to meet the market demand.

[0027] Before discussing the exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although the flowcharts describe the operations (or steps) as sequential processes, many of the operations (or steps) can be implemented in parallel, concurrently, or simultaneously. In addition, the order of the operations can be rearranged. The process can be terminated when its operations are completed, but it can also have additional steps not included in the drawings; the process can correspond to a method, function, procedure, subroutine, subprogram, and so on.

[0028] The technical solution of the present invention will be further specifically described below through embodiments in conjunction with the drawings.

[0029] Embodiment: A combustible gas collection box for a transformer in this embodiment, as Figure 1 、 Figure 2 shown, includes a box body and a controller. A detection chamber, a gas extraction chamber, and a waste oil chamber are sequentially arranged in the box body from top to bottom. The gas extraction chamber is connected to the gas relay on the transformer through an oil-gas input pipe. The gas extraction chamber is connected to the waste oil chamber through a waste oil pipe. A first float is arranged in the gas extraction chamber, and a second float is arranged in the waste oil chamber. The top of the gas extraction chamber is connected to the top of the waste oil chamber through an exhaust pipe. A test component is also arranged in the box body.

[0030] An oil-gas solenoid valve is arranged on the oil-gas input pipe, a waste oil solenoid valve is arranged on the waste oil pipe, and an exhaust solenoid valve is arranged on the exhaust pipe. The test component includes an acetylene sensor. An intake pipe and an outlet pipe are respectively connected between the acetylene sensor and above the gas extraction chamber. An intake solenoid valve and an air pump are arranged on the intake pipe, and an outlet solenoid valve is arranged on the outlet pipe. The test component also includes a hydrogen sensor, and the hydrogen sensor is arranged between the detection chamber and the gas extraction chamber. When entering the detection state, turn on the air pump to conduct air circulation, start the acetylene sensor for detection, record the air collection value as the detection base value. After recording, then turn on the intake solenoid valve and the outlet solenoid valve, extract the gas in the gas extraction chamber through the air pump, start the hydrogen sensor and the acetylene sensor for gas detection. After the detection is completed, turn off the air pump, the intake solenoid valve, and the outlet solenoid valve.

[0031] A controller is arranged inside the box body. Inside the box body, a detection chamber, a gas extraction chamber, and a waste oil chamber are sequentially arranged from top to bottom. The controller is located in the detection chamber. The gas extraction chamber is connected to the gas relay located on the transformer through an oil-gas input pipe. The oil-gas mixture in the gas relay will enter the gas extraction chamber through the oil-gas input pipe. An oil-gas solenoid valve is arranged on the oil-gas input pipe. A waste oil pipe is arranged between the gas extraction chamber and the waste oil chamber. A waste oil solenoid valve is arranged on the waste oil pipe. A first float is arranged in the gas extraction chamber, and a second float is arranged in the waste oil chamber. An exhaust pipe is communicatively arranged between the upper part of the gas extraction chamber and the upper part of the waste oil chamber. An exhaust solenoid valve is arranged on the exhaust pipe. An exhaust port is arranged on the side wall of the waste oil chamber. An acetylene sensor is arranged inside the box body. The acetylene sensor and the upper part of the gas extraction chamber are respectively communicatively arranged with an intake pipe and an outlet pipe. An intake solenoid valve and an air pump are arranged on the intake pipe. An outlet solenoid valve is arranged on the outlet pipe. A hydrogen sensor is also arranged between the detection chamber and the gas extraction chamber. The gas relay, the oil-gas solenoid valve, the exhaust solenoid valve, the intake solenoid valve, the air pump, the outlet solenoid valve, the first float, the second float, the acetylene sensor, and the hydrogen sensor are all electrically connected to the controller. The controller, the hydrogen sensor, the acetylene sensor, and each solenoid valve are all existing devices. When the entire gas collection box is operating, it is specifically divided into initial, action, intake, detection, and evacuation states. Guide rods are arranged inside the box body in cooperation with the first float and the second float. Guide rods are arranged inside the box body in cooperation with the first float and the second float. The arrangement of the guide rods can ensure the stability of the first float and the second float when rising or falling, prevent the first float or the second float from shifting positions, and ensure the accuracy of the data.

[0032] When in the initial state, all solenoid valves are in the closed state. The controller determines whether the first float is at the top. If the first float is not at the top, the exhaust solenoid valve and the oil-gas solenoid valve are activated. The oil-gas mixture in the gas relay will enter the gas collection chamber through the oil-gas input pipe, and then this oil-gas mixture will accumulate in the gas collection chamber and drive the first float to rise. And the gas in the gas collection chamber will flow out from the exhaust port after passing through the exhaust pipe. When the first float rises to the top, the exhaust solenoid valve and the oil-gas solenoid valve are closed, waiting for the next operation; Next, it enters the action state. At this time, it is necessary to wait for whether there is a light gas action in the gas relay. If there is a light gas action, it enters the intake state, and the oil-gas solenoid valve and the waste oil solenoid valve are opened. The oil in the oil-gas mixture in the gas collection chamber will enter the waste oil chamber through the waste oil pipe, and the gas in the oil-gas mixture still remains in the gas collection chamber. Subsequently, the second float rises and the first float descends. When the first float descends to the set position, the oil-gas solenoid valve and the waste oil solenoid valve are closed, and the first float is then stable; Next, it enters the detection state. The air pump is turned on for air circulation, and the acetylene sensor is activated for detection. The air collection value is recorded as the detection base value. After recording, the intake solenoid valve and the outlet solenoid valve are opened, and the gas in the gas collection chamber is extracted by the air pump. The hydrogen sensor and the acetylene sensor are activated for gas detection. After the detection is completed, the air pump, the intake solenoid valve, and the outlet solenoid valve are closed; Finally, it enters the evacuation state. The oil-gas solenoid valve and the exhaust solenoid valve are opened. The oil-gas mixture in the gas relay will continue to flow into the gas collection chamber, and then when the first float rises to the top, the oil-gas solenoid valve and the exhaust solenoid valve are closed. Then check the state of the second float to decide whether it is necessary to manually empty the oil in the waste oil chamber; The entire detection process is controlled by the controller, with a high degree of automation, simple operation, high work efficiency, and can meet the market demand.

[0033] A drain pipe is connected to the bottom of the waste oil chamber in a communicating manner, and an oil drain valve is provided on the drain pipe. A drain pipe is connected to the bottom of the waste oil chamber in a communicating manner, and an oil drain valve is provided on the drain pipe. When the staff opens the oil drain valve, the remaining oil in the waste oil chamber can be manually drained.

[0034] A drain bottom plate is provided at the bottom of the waste oil chamber. An oil drain groove is provided on the drain bottom plate. An oil drain plate is slidably connected in the oil drain groove. A drain spring is connected between the bottom of the oil drain plate and the bottom surface of the oil drain groove. An oil drain channel is provided in the drain bottom plate. One end of the oil drain channel communicates with the oil drain groove and cooperates with the oil drain plate, and the other end of the oil drain channel extends to the outside of the box body.

[0035] A drain oil bottom plate is provided at the bottom of the waste oil cavity. A drain oil groove is provided on the drain oil bottom plate. A drain oil plate is slidably connected in the drain oil groove. A drain oil spring is connected between the bottom of the drain oil plate and the bottom surface of the drain oil groove. A drain oil passage is provided in the drain oil bottom plate. One end of the drain oil passage communicates with the drain oil groove and cooperates with the drain oil plate. The other end of the drain oil passage extends to the outside of the box body. The drain oil plate can block the drain oil passage when not moving. When there is too much oil in the waste oil cavity, the pressure of the oil will overcome the spring force of the drain oil spring and press down the drain oil plate, causing the drain oil plate to slide in the drain oil groove. As the drain oil plate moves, the drain oil passage will communicate with the drain oil groove, so that the oil in the waste oil cavity will flow into the drain oil passage and then be discharged outside the box body, thus playing an automatic oil drainage role when there is more oil in the waste oil cavity.

[0036] A gas-blocking oil bag that cooperates with the drain oil passage is provided at one end of the drain oil plate. A gas-blocking oil bag that cooperates with the drain oil passage is provided at one end of the drain oil plate. The gas-blocking oil bag has good elasticity and can play a good role in blocking the drain oil passage. When there is less oil in the waste oil cavity, the oil will not flow out from the drain oil passage.

[0037] A sealing oil plate is connected to the side wall of the drain oil passage near the drain oil groove through a sealing oil torsion spring. The sealing oil plate cooperates with the gas-blocking oil bag. A sealing oil plate that cooperates with the gas-blocking oil bag is connected to the side wall of the drain oil passage near the drain oil groove through a sealing oil torsion spring. The sealing oil plate will tilt outwards under the action of the sealing oil torsion spring and press against the gas-blocking oil bag. When there is less oil in the waste oil cavity, the drain oil plate will drive the gas-blocking oil bag to move to the corresponding drain oil passage under the action of the drain oil spring. The gas-blocking oil bag will drive the sealing oil plate to move against the elastic force of the sealing oil torsion spring and make the sealing oil plate press against the port of the drain oil passage, so that the gas-blocking oil bag and the sealing oil plate cooperate to block the drain oil passage and prevent accidental oil leakage. When there is too much oil in the waste oil cavity, driving the drain oil plate to move to start automatic oil drainage, the sealing oil plate will press on the gas-blocking oil bag under the action of the sealing oil torsion spring, facilitating the discharge of oil.

[0038] A number of drain oil springs are provided. The number of drain oil springs is evenly distributed at the bottom of the drain oil plate. Multiple drain oil springs are evenly distributed at the bottom of the drain oil plate, so that the drain oil plate is evenly stressed and there will be no uncontrollable oil leakage phenomenon. The end of the drain oil passage away from the drain oil groove is connected with a drain oil pipe. The drain oil pipe can play a certain role in guiding the waste oil and divert the waste oil to an external collection box or a specific position.

[0039] Such as Figure 1 、 2As shown in the figure, a combustible gas collecting box for a transformer includes a box body 1. A controller 3 is arranged inside the box body 1. Inside the box body 1, a detection chamber 17, a gas sampling chamber 5, and a waste oil chamber 4 are arranged in sequence from top to bottom. The controller 3 is located in the detection chamber 17. A gas-oil input pipe 10 is connected between the gas sampling chamber 5 and a gas relay 2 located on the transformer. The gas-oil mixture in the gas relay 2 will enter the gas sampling chamber 5 through the gas-oil input pipe 10. An oil-gas solenoid valve 101 is arranged on the gas-oil input pipe 10. A waste oil pipe 8 is arranged between the gas sampling chamber 5 and the waste oil chamber 4. A waste oil solenoid valve 81 is arranged on the waste oil pipe 8. A first float 15 is arranged in the gas sampling chamber 5, and a second float 16 is arranged in the waste oil chamber 4. An exhaust pipe 9 is communicated between the upper part of the gas sampling chamber 5 and the upper part of the waste oil chamber 4. An exhaust solenoid valve 91 is arranged on the exhaust pipe 9. An exhaust port 6 is arranged on the side wall of the waste oil chamber 4. An acetylene sensor 7 is arranged inside the box body 1. An intake pipe 11 and an outlet pipe 12 are respectively communicated between the acetylene sensor 7 and the upper part of the gas sampling chamber 5. An intake solenoid valve 111 and an air pump 112 are arranged on the intake pipe 11. An outlet solenoid valve 121 is arranged on the outlet pipe 12. A hydrogen sensor 13 is also arranged between the detection chamber 17 and the gas sampling chamber 5. The gas relay 2, the oil-gas solenoid valve 101, the exhaust solenoid valve 91, the intake solenoid valve 111, the air pump 112, the outlet solenoid valve 121, the first float 15, the second float 16, the acetylene sensor 7, and the hydrogen sensor 13 are all electrically connected to the controller 3. The controller 3, the hydrogen sensor 13, the acetylene sensor 7, and each solenoid valve are all existing devices. When the entire collecting box is running, it is specifically divided into initial, action, intake, detection, and evacuation states. When in the initial state, each solenoid valve is in the closed state. The controller 3 judges whether the first float 15 is located at the top. If the first float 15 is not located at the top, the exhaust solenoid valve 91 and the oil-gas solenoid valve 101 are started. The gas-oil mixture in the gas relay 2 will enter the gas sampling chamber 5 through the gas-oil input pipe 10, and then this gas-oil mixture will accumulate in the gas sampling chamber 5 and drive the first float 15 to rise. And the gas in the gas sampling chamber 5 will flow out from the exhaust port 6 after passing through the exhaust pipe 9. When the first float 15 rises to the top, the exhaust solenoid valve 91 and the oil-gas solenoid valve 101 are closed, waiting for the next operation; Next, it enters the action state. At this time, it is necessary to wait for whether there is a light gas action in the gas relay 2. If there is a light gas action, it enters the intake state. The oil-gas solenoid valve 101 and the waste oil solenoid valve 81 are opened. The oil in the gas-oil mixture in the gas sampling chamber 5 will enter the waste oil chamber 4 through the waste oil pipe 8. The gas in the gas-oil mixture still remains in the gas sampling chamber 5. Subsequently, the second float 16 rises and the first float 15 descends. When the first float 15 descends to the set position, the oil-gas solenoid valve 101 and the waste oil solenoid valve 81 are closed, and the first float 15 is then stable;Next, enter the detection state. Turn on the air pump 112 to conduct air circulation, start the acetylene sensor 7 for detection, record the air collection value as the detection base value. After recording, turn on the intake solenoid valve 111 and the outlet solenoid valve 121, extract the gas in the gas extraction chamber 5 through the air pump 112, start the hydrogen sensor 13 and the acetylene sensor 7 for gas detection. After the detection is completed, turn off the air pump 112, the intake solenoid valve 111, and the outlet solenoid valve 121. Finally, enter the evacuation state. Turn on the oil-gas solenoid valve 101 and the exhaust solenoid valve 91. The oil-gas mixture in the gas relay 2 will continue to flow into the gas extraction chamber 5. Then, after the first float 15 rises to the top, turn off the oil-gas solenoid valve 101 and the exhaust solenoid valve 91, and then check the state of the second float 16 to determine whether it is necessary to manually drain the oil in the waste oil chamber 4. The entire detection process is controlled by the controller 3, with high automation, simple operation, high work efficiency, and can meet the market demand.

[0040] A drain pipe 141 is connected to the bottom of the waste oil chamber 4 in a communicating manner, and an oil drain valve 142 is provided on the drain pipe 141. When the staff opens the oil drain valve 142, the remaining oil in the waste oil chamber 4 can be manually drained.

[0041] A guide rod 18 that cooperates with the first float 15 and the second float 16 is provided in the box body 1. The setting of the guide rod 18 can ensure the stability of the first float 15 and the second float 16 when rising or falling, prevent the first float 15 or the second float 16 from shifting positions, and ensure the accuracy of the data.

[0042] A drain bottom plate 46 is provided at the bottom of the waste oil chamber 4. An oil drain groove 41 is provided on the drain bottom plate 46. An oil drain plate 42 is slidably connected in the oil drain groove 41. A drain spring 43 is connected between the bottom of the oil drain plate 42 and the bottom surface of the oil drain groove 41. The number of drain springs 43 is multiple, and the multiple drain springs 43 are evenly distributed at the bottom of the oil drain plate 42, so that the oil drain plate 42 is evenly stressed and there will be no uncontrollable oil leakage phenomenon. An oil drain channel 44 is provided in the drain bottom plate 46. One end of the oil drain channel 44 communicates with the oil drain groove 41 and cooperates with the oil drain plate 42. The other end of the oil drain channel 44 extends to the outside of the box body 1. The oil drain plate 42 can block the oil drain channel 44 when not moving. When there is too much oil in the waste oil chamber 4, the pressure of the oil will overcome the spring force of the drain spring 43 and press down the oil drain plate 42, causing the oil drain plate 42 to slide in the oil drain groove 41. As the oil drain plate 42 moves, the oil drain channel 44 will communicate with the oil drain groove 41, so that the oil in the waste oil chamber 4 will flow into the oil drain channel 44 and then be discharged outside the box body 1, thus playing an automatic oil drainage role when there is more oil in the waste oil chamber 4.

[0043] One end of the oil drain plate 42 is provided with a gas-blocking airbag 47 that cooperates with the oil drain passage 44. The gas-blocking airbag 47 has good elasticity and can play a good role in blocking the oil drain passage 44, so that the oil will not flow out from the oil drain passage 44 when the oil in the waste oil chamber 4 is less; on the side wall of the end of the oil drain passage 44 close to the oil drain groove 41, an oil-sealing plate 49 that cooperates with the gas-blocking airbag 47 is connected through an oil-sealing torsion spring 48. Under the action of the oil-sealing torsion spring 48, the oil-sealing plate 49 will tilt outwards and press against the gas-blocking airbag 47. When the oil in the waste oil chamber 4 is less, the oil drain plate 42 will drive the gas-blocking airbag 47 to move to the corresponding oil drain passage 44 under the action of the oil drain spring 43. The gas-blocking airbag 47 will drive the oil-sealing plate 49 to move after overcoming the elastic force of the oil-sealing torsion spring 48 and make the oil-sealing plate 49 press against the port of the oil drain passage 44, so that the gas-blocking airbag 47 and the oil-sealing plate 49 cooperate to block the oil drain passage 44 and prevent the accidental leakage of oil; when the oil in the waste oil chamber 4 is too much to drive the oil drain plate 42 to move and start automatic oil drainage, the oil-sealing plate 49 will press on the gas-blocking airbag 47 under the action of the oil-sealing torsion spring 48, which is convenient for the discharge of oil.

[0044] One end of the oil drain passage 44 away from the oil drain groove 41 is connected with an oil drain pipe 45, and the oil drain pipe 45 can play a certain role in guiding the waste oil and divert the waste oil to an external collection box or a specific position.

[0045] The operation of the present invention is simple, with high working efficiency and high degree of automation, which can meet the market demand. The gas component detection in the entire gas collection box adopts an acetylene sensor and a hydrogen sensor, which can directly measure the acetylene component and hydrogen component in the gas decomposed from the transformer oil. The entire gas collection box has a long service life and low failure rate.

[0046] The specific embodiments described herein are merely illustrative of the spirit of the present invention. The above embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention patent. It should be noted that those skilled in the technical field to which the present invention belongs can make various modifications or supplements to the described specific embodiments or use similar methods to replace them, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims. For those of ordinary skill in the art, without departing from the concept of the present invention, multiple deformations and improvements can also be made. Therefore, the protection scope of the present invention patent should be subject to the appended claims.

Claims

1. A combustible gas collecting box for a transformer, comprising a box body and a controller, characterized in that: The box body is provided with a detection chamber, an air intake chamber and a waste oil chamber in sequence from top to bottom. The air intake chamber is connected to the gas relay on the transformer through an oil and gas input pipe, the air intake chamber is connected to the waste oil chamber through a waste oil pipe, a first float is provided in the air intake chamber, a second float is provided in the waste oil chamber, the top of the air intake chamber is connected to the top of the waste oil chamber through an exhaust pipe, and a test component is also provided in the box body.

2. A combustible gas collecting box for a transformer according to claim 1, characterized in that: The oil and gas input pipe is provided with an oil and gas solenoid valve, the waste oil pipe is provided with a waste oil solenoid valve, and the exhaust pipe is provided with an exhaust solenoid valve.

3. The combustible gas collecting box for transformer according to claim 1, characterized in that: The test assembly comprises an acetylene sensor, and an air inlet pipe and an air outlet pipe are respectively connected to the acetylene sensor and the air extraction cavity. An air inlet solenoid valve and an air pump are arranged on the air inlet pipe, and an air outlet solenoid valve is arranged on the air outlet pipe.

4. A combustible gas collecting box for a transformer according to claim 1 or 3, characterized in that: The test assembly also includes a hydrogen sensor, which is arranged between the detection cavity and the gas extraction cavity.

5. The combustible gas collecting box for transformer according to claim 1, characterized in that: The bottom of the waste oil chamber is connected to an oil drain pipe, and an oil drain valve is arranged on the oil drain pipe.

6. The combustible gas collecting box for transformer according to claim 1, characterized in that: An oil drain bottom plate is provided at the bottom of the waste oil chamber, an oil drain groove is provided on the oil drain bottom plate, an oil drain plate is slidably connected in the oil drain groove, an oil drain spring is connected between the bottom of the oil drain plate and the bottom surface of the oil drain groove, an oil drain channel is provided in the oil drain bottom plate, one end of the oil drain channel is connected to the oil drain groove and cooperates with the oil drain plate, and the other end of the oil drain channel extends to the outside of the box body.

7. A combustible gas collecting box for a transformer according to claim 6, characterized in that: One end of the oil drain plate is provided with an oil blocking air bag matched with the oil drain channel.

8. The combustible gas collecting box for transformer according to claim 7, characterized in that: The side wall of the oil drain channel close to one end of the oil drain groove is connected with an oil sealing plate through an oil sealing torsion spring, and the oil sealing plate cooperates with the oil blocking air bag.

9. A combustible gas collecting box for a transformer according to claim 6, 7 or 8, characterized in that: The oil drain springs are provided in plurality and are evenly distributed at the bottom of the oil drain plate.

10. A combustible gas collecting box for a transformer according to claim 6, 7 or 8, characterized in that: One end of the oil drain channel away from the oil drain groove is connected with an oil drain pipe.

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