A gas extraction device

Abstract

The utility model provides a kind of gas taking device, butt joint gas relay, the gas in gas relay is safely released and sampled, including oil storage unit, exhaust unit, fluid conveying unit, gas collection unit and gas taking unit;Wherein, the fluid of the oil storage unit is input and output to exhaust unit;The fluid conveying unit, fluid in exhaust unit is input or output gas collection unit;The gas collection unit, collect gas from inside gas relay;The gas taking unit, collect gas from inside gas collection unit.It can efficiently, safely realize gas taking.

Description

Technical Field

[0001] This utility model relates to a gas collection and extraction scheme for transformers, specifically, to a gas extraction device. Background Technology

[0002] In routine operation, the transformer uses a gas collection box for gas sampling (e.g., patent publication number CN116878970A). The gas collection box, as an accessory to the gas relay, is installed in the lower part of the main transformer, with gas drawn from the gas relay's side vent via a priming copper pipe. It consists of a priming copper pipe, a vent plug, an oil drain plug, a housing, and a glass observation window. The gas sampling method is as follows: First, unscrew the oil drain plug at the bottom of the gas collection box, open the drain plug, and slowly release the transformer oil from the gas collection box. This allows the gas accumulated in the gas relay to enter the gas collection box through the priming copper pipe under the pressure of the main body oil. When oil continuously flows from the priming copper pipe, the light pressure signal disappears, and the oil level in the gas collection box begins to rise, it indicates that there is no more gas in the gas relay. Then, close the oil drain plug. Afterward, read the gas volume, unscrew the priming plug at the top of the gas collection box, connect a latex tube, a medical three-way valve, and a syringe, and perform gas sampling. After the gas sampling is complete, wait for the vent plug to release the gas until oil comes out, then close the vent plug and screw the plug back in. Finally, send the sampled gas for testing.

[0003] This solution has the following drawbacks:

[0004] (1) Significant personal safety hazards: When the oil drain plug of the gas collecting box is opened to drain the oil, the operator needs to come into close contact with the transformer oil, and the oil is easy to splash onto the body or clothing. When there is an internal fault in the transformer, the oil may contain flammable gases, such as methane. Once it comes into contact with an open flame or static spark, it may cause an explosion or fire, seriously threatening the life safety of the operator.

[0005] (2) Cumbersome operation and low efficiency: The gas extraction process requires manual screwing of the oil drain plug multiple times, which is complicated and time-consuming. The traditional method takes 30 minutes, which increases the labor intensity of the operators.

[0006] (3) Low detection accuracy: Manual oil draining operation is prone to air mixing, resulting in gas sample contamination and high error rate; it relies on experience operation and has insufficient reliability.

[0007] (4) Limited applicable scenarios: It is only compatible with the gas relay of the main transformer body. The gas relay of the on-load tap changer needs to be handled separately, resulting in poor compatibility and increased equipment maintenance costs.

[0008] The design adopted in the existing patent "A gas sampling method and detection device for transformer gas protection operation" (publication number CN114427990A) can partially solve the above problems, but it also brings a lot of new problems, such as: (1) The use of independent gas / oil containers increases the size of the equipment and may cause internal pressure problems, resulting in oil entering gas and gas entering oil. (2) It judges the gas filling status by margin time, but since this is an estimated time, there may be problems such as gas not being completely collected or excessive gas filtration leading to damage to relay performance. (3) It directly discharges oil by opening the oil drain hole of the oil collection container, which leads to waste oil disposal problems, increases costs and manual processing time, and when oil needs to be replenished, the terminal equipment needs to be opened for replenishment, which is inconvenient and reduces efficiency. (4) It uses a gas detection interface to connect a gas detector for direct analysis and detection, which requires professional equipment to be connected one by one, resulting in a significant increase in costs and is not conducive to industrialization. Utility Model Content

[0009] The present invention aims to overcome the above-mentioned defects and provide an efficient and safe gas extraction device and method.

[0010] This utility model provides a gas sampling device that connects to a gas relay to safely release and sample the gas inside the gas relay. It includes an oil storage unit, an exhaust unit, a fluid transport unit, a gas collection unit, and a gas sampling unit.

[0011] The aforementioned oil storage unit inputs and outputs fluid to the exhaust unit;

[0012] The aforementioned fluid delivery unit inputs or outputs the fluid from the exhaust unit to the gas collection unit;

[0013] The aforementioned gas collection unit collects gas from the gas relay;

[0014] The gas sampling unit described above collects gas from the gas collecting unit.

[0015] Furthermore, the gas extraction device provided by this utility model is further characterized in that:

[0016] The aforementioned oil storage unit includes an oil storage container;

[0017] The aforementioned oil storage container is connected to the venting unit via multi-way valve A.

[0018] Furthermore, the gas extraction device provided by this utility model is further characterized in that:

[0019] The aforementioned exhaust unit includes a sealed oil tank;

[0020] The aforementioned sealed oil tank has a first port, a second port, and a third port;

[0021] The aforementioned first port connects to the oil storage unit;

[0022] The second port mentioned above is connected to the exhaust valve;

[0023] The aforementioned third port connects to the fluid delivery unit.

[0024] Furthermore, the gas extraction device provided by this utility model is further characterized in that:

[0025] The aforementioned fluid delivery unit includes a fluid delivery mechanism;

[0026] The aforementioned fluid delivery mechanism connects to the exhaust unit via a multi-port connector;

[0027] The aforementioned multi-port connector includes connector I and connector II;

[0028] Among them, the aforementioned connector I end is connected to the exhaust unit;

[0029] The aforementioned connector II is connected to the fluid delivery unit.

[0030] Furthermore, the gas extraction device provided by this utility model is further characterized in that:

[0031] The aforementioned multi-port connector also includes connector III;

[0032] The pressure monitoring device is connected to end III of the above-mentioned connector.

[0033] Furthermore, the gas extraction device provided by this utility model is further characterized in that:

[0034] The aforementioned fluid transport mechanism has two operating modes: oil inlet and oil return. It is connected to the gas collection unit via a multi-way valve B.

[0035] Furthermore, the gas extraction device provided by this utility model is further characterized in that:

[0036] The aforementioned gas collection unit includes a gas collection box;

[0037] The aforementioned gas collection box includes an oil inlet / outlet end, an air inlet end, and an air outlet end;

[0038] The aforementioned oil inlet and outlet ends are connected to the fluid transport unit;

[0039] The aforementioned air intake is connected to the gas relay;

[0040] The aforementioned venting end is connected to the gas intake unit.

[0041] Furthermore, the gas extraction device provided by this utility model is further characterized in that:

[0042] The aforementioned gas sampling unit includes a gas sampling mechanism and a sealing joint;

[0043] The aforementioned sealing joint matches the vent end and forms an openable / closable connection;

[0044] The aforementioned gas intake mechanism is connected to the gas collection unit via a one-way valve.

[0045] The function and effects of this utility model:

[0046] Compared with traditional gas extraction methods, the gas extraction device of this invention has the following advantages:

[0047] (1) Eliminate personal safety hazards: Replace manual oil draining operations with automated equipment to avoid the risk of transformer oil splashing and explosion caused by flammable gases.

[0048] (2) Simplify the operation process and improve efficiency: realize the automated control of the gas collection process, shorten the gas collection time to 5 minutes, and reduce the labor intensity of operators.

[0049] (3) Improve the accuracy of test results: Through sealing design and anti-backflow structure, avoid air mixing and oil droplet contamination to ensure the purity of gas samples; accurately control the gas collection process to reduce the impact of human factors on test results.

[0050] (4) Enhance equipment compatibility: It is compatible with both main transformer body and on-load tap changer gas relays to meet the gas collection needs of different transformer environments and reduce equipment maintenance costs. Attached Figure Description

[0051] Figure 1 A schematic diagram of the overall structure of the gas extraction device provided in this embodiment under gas emission conditions;

[0052] Figure 2 A schematic diagram of the overall structure of the gas sampling device provided in this embodiment under gas sampling conditions;

[0053] Figure 3 A three-dimensional schematic diagram of the overall structure of the gas extraction device provided in this embodiment.

[0054] Among them, 1, A conduit; 2, 100ml glass syringe; 3, one-way valve; 4, fluororubber seal; 5, B conduit; 6, sealed oil tank; 7, oil storage container; 8, oil outlet three-way valve; 9, oil inlet three-way valve; 10, exhaust valve; 11, three-way connector; 12, pressure gauge; 13, oil discharge pump; 14, power module.

[0055] Regarding the B catheter, there are 8 of them, ranging from 5-1 to 5-8. Detailed Implementation

[0056] This invention can be implemented in many ways and has various embodiments, therefore specific embodiments are illustrated and described in the accompanying drawings. However, this is not intended to limit the invention to specific implementations, but should be understood to include all modifications, equivalents, and even substitutions that fall within the spirit and technical scope of this invention.

[0057] like Figures 1-3 As shown, this embodiment provides a gas extraction device, which includes an oil storage unit, an exhaust unit, a fluid conveying unit, a gas collection unit, and a gas extraction unit;

[0058] The oil storage unit, including an oil storage container 7, uses conduits and other mechanisms to input and output the stored oil to the exhaust unit. It is a structure open to the atmosphere, meaning any air entering it will be directly discharged out of the entire system. The oil delivery pipe, being submerged below the liquid surface, will not introduce air during oil delivery.

[0059] The exhaust unit includes a sealed oil tank 6, which has a first port, a second port and a third port; these ports are respectively connected to an oil storage unit, an exhaust valve and a fluid delivery unit; on the one hand, it connects to the oil storage container to achieve fluid communication with the oil storage container, and on the other hand, it achieves the exhaust effect; furthermore, through the connection with the fluid delivery unit, it achieves the effect of delivering the fluid inside to or out of the gas collection unit.

[0060] The oil volume of the oil storage container 7 is greater than that of the sealed oil tank 6.

[0061] The fluid delivery unit includes a fluid delivery mechanism, namely, an oil pump 13, which has two operating modes: oil inlet and oil return. It controls the forward and reverse rotation of the oil circuit to achieve automatic oil inlet and oil return (i.e., to achieve the effect of inputting or outputting fluid from the exhaust unit to the gas collection unit), thus avoiding manual intervention.

[0062] The gas collection unit includes a gas collection box with a viewing window to observe changes in the liquid level. It includes an oil inlet / outlet, a gas inlet, and a gas outlet, which are respectively connected to the fluid transport unit, the gas relay, and the gas sampling unit. On the one hand, it achieves fluid communication with the sealed oil tank through the oil discharge pump; on the other hand, it collects gas from the gas relay; and on the other hand, it sends the gas waiting to be sampled into the gas sampling mechanism.

[0063] The gas collection unit includes a gas collection mechanism, namely a 100ml glass syringe 2. The specifications of the syringe can be adjusted according to the actual needs of use. It is connected to the gas collection box through a pipeline, thereby achieving the effect of obtaining the sample to be tested from the gas collection box. In addition, in order to avoid gas leakage, a one-way valve 3 is provided on the pipeline.

[0064] The specific connection methods between the above units are as follows:

[0065] The oil storage container 7 is connected to the lower end of the oil outlet three-way valve 8 via the B conduit 5-1. The oil outlet three-way valve 8 can precisely control the flow of oil and gas and isolate air pollution.

[0066] The upper end of the three-way valve 8 is in the closed state;

[0067] The middle end of the oil outlet three-way valve 8 is connected to the port on the right side of the top of the sealed oil tank 6 via the B conduit 5-2;

[0068] The port at the top of the sealed oil tank 6 is connected to the vent valve 10 via conduit B 5-3;

[0069] The port on the top left side of the sealed oil tank 6 is connected to the lower end of the tee connector 11 via conduit B 5-4;

[0070] The upper end of the tee connector 11 is connected to the pressure gauge 12 through the B conduit 5-5. The pressure gauge monitors the gas pressure in real time to ensure the stability of the sampling process. It is electrically connected to the oil pump. When the pressure is over-pressurized, it will automatically alarm and cut off the pump power supply to prevent the system from overload.

[0071] The middle end of the tee connector 11 is connected to one side of the oil discharge pump 13 via the B conduit 5-6;

[0072] The other side of the oil pump 13 is connected to the middle end of the oil inlet three-way valve 9 through the B conduit 5-7. The oil inlet three-way valve 9 can precisely control the flow of oil and gas and isolate air pollution.

[0073] The lower end of the oil inlet three-way valve 9 is in the closed state;

[0074] The upper end of the three-way inlet valve 9 is connected to the drain plug at the lower end of the air collection box via the B conduit 5-8;

[0075] The upper left end of the gas collection box is connected to the gas relay via a priming copper pipe, and an air inlet valve is installed on the pipe.

[0076] The upper right end of the gas collection box has a gas outlet hole controlled by a vent plug;

[0077] The gas outlet port is connected to a fluororubber seal 4 that can be opened and closed.

[0078] The fluororubber seal 4 is connected to a 100ml glass syringe 2 via conduit A 1;

[0079] A one-way valve 3 is installed on the pipeline of conduit 1.

[0080] After the vent plug is opened, the gas can overflow through the gas outlet hole, pass through tube A 1, and finally enter the 100ml glass syringe 2.

[0081] The power module 14 is electrically connected to each electronic control device, providing a power source for the entire device.

[0082] The materials and functions of the above components are described in the table below:

[0083]

[0084]

[0085] The specific operation and usage methods are as follows:

[0086] Step 1: Safety Preparation

[0087] S1. Check the device for leaks, confirm that the pressure gauge pointer is at zero, and wear anti-static clothing and insulating gloves.

[0088] S2. Initial state: Intake valve closed, oil inlet three-way valve closed, oil outlet three-way valve closed, exhaust valve closed, vent plug closed.

[0089] Note: Initially, the gas collecting box is filled with transformer oil. That is, the state after gas is taken.

[0090] Step 2: Gas Emission

[0091] S1. Open the intake valve, oil inlet three-way valve and oil outlet three-way valve in sequence.

[0092] S2. Start the oil discharge pump motor to rotate forward, causing the oil discharge pump to run in the return direction. At this time:

[0093] (1) The initial transformer oil in the gas collecting box enters the sealed oil tank through the inlet three-way valve → drain pump → three-way connector;

[0094] (2) The original air in the sealed oil tank is discharged into the oil storage container through the oil outlet three-way valve (connected to atmospheric pressure);

[0095] (3) Under the action of the main body oil pressure and the oil discharge pump, the gas accumulated in the gas relay enters the gas collection box along the priming copper pipe;

[0096] S3. Observe the oil level in the gas collection box. Once it stops dropping, it indicates that the gas in the relay has been purged. At this point, immediately stop the motor and record the final system pressure value.

[0097] S4. Slowly open the vent valve to release the gas from the sealed oil tank, while closely monitoring the pressure changes. Once the pressure stabilizes, close the vent valve.

[0098] Step 3: Gas Sample Collection

[0099] S1. Close the inlet valve, connect the fluororubber seal of pipe A to the gas outlet port, and then open the vent plug. Ensure that all connections are properly sealed to prevent gas leakage.

[0100] S2. Reverse the motor, causing the oil pump to run in the oil inlet direction. The gas in the gas collection box is pushed upwards by the refueling agent. The gas then enters the 100ml glass syringe through tube A and the one-way valve. Record the collection time at this point. During this process, closely monitor the volume change of the gas in the syringe to prevent overpressure.

[0101] S3. After gas sampling is complete, close the one-way valve and remove the fluororubber seal. First, vent the gas through the vent plug (direct venting poses no safety hazard) until oil flows out, then tighten the vent plug. Finally, screw the plug back in; the gas sampling operation is now complete. After gas sampling, check the status of the relevant equipment to ensure it is in a safe condition.

[0102] Step 4: Sealing and Transport

[0103] S1. Close all valves;

[0104] S2. Seal the syringe with a silicone cap and store it away from light (temperature 20±5℃);

[0105] S3. Delivered to the laboratory for chromatographic analysis within 24 hours.

[0106] The function and effect of this embodiment:

[0107] This embodiment employs an automated safety gas extraction design: an oil pump is used to replace manual oil extraction, achieving automated control of the oil inlet and outlet circuits, completely avoiding manual contact with transformer oil, eliminating the risk of flammable gas explosion caused by oil splashing, and fundamentally improving personal safety performance.

[0108] This embodiment utilizes a modular, rapid operation process: reducing the traditional 30-minute gas extraction process to 5 minutes. Through modular components, including conduits, oil pumps, three-way valves, and exhaust valves, it adapts to both the main transformer and on-load tap changers, significantly improving maintenance efficiency and reducing labor intensity.

[0109] This embodiment employs a highly efficient sealing and anti-backflow structure: through the combined design of a one-way valve built into the A conduit, a fluororubber seal, an inlet three-way valve, an outlet three-way valve, an exhaust valve, and an oil pump, it ensures that no air mixes in and no oil droplet contamination occurs during the gas sample collection process, with a gas collection error rate of less than 1%, significantly improving the accuracy of the detection results.

[0110] This embodiment employs a dual safety mechanism: firstly, it monitors the pressure in real time using a pressure gauge to prevent the risk of overpressure; secondly, it uses silicone caps for sealing and light protection during the storage and transportation process to ensure the stability of the gas sample during transportation and avoid misjudgments caused by gas sample deterioration.

[0111] This embodiment significantly improves personal safety: it completely eliminates the risk of oil splashing and flammable gas explosion caused by manual oil draining, providing comprehensive safety protection for operators.

[0112] This embodiment significantly improves detection efficiency and accuracy: the operation time is reduced from 30 minutes to 5 minutes, increasing efficiency by 6 times; the error rate is less than 1%, avoiding air contamination and oil droplet contamination, and the accuracy of detection results is 40% higher than that of traditional solutions, effectively reducing misjudgments of equipment malfunctions.

[0113] The equipment in this embodiment has strong compatibility and adaptability: it is compatible with both main transformer body and on-load tap changer gas relays, and is suitable for oil temperature environments of -20℃ to 120℃, meeting the gas collection needs of various transformers and reducing equipment maintenance costs.

[0114] This embodiment is easy to operate and maintain: the modular design makes it easy to install and disassemble; the inner wall of the conduit only needs to be cleaned with anhydrous ethanol every month; the connector needs to be disassembled, vacuumed and resealed every year; the rubber seal needs to be tested for oil resistance every 2 years; the maintenance cost is low and the service life is long.

[0115] This embodiment boasts high safety standards and reliability: it adheres to high-voltage equipment operation safety regulations, and features real-time pressure monitoring via pressure gauges, backflow prevention via check valves, and a sealing structure to ensure stable operation of the device at a maximum working pressure of 0.8MPa, with airtightness meeting standards (pressure drop ≤0.5% over 24 hours), providing a reliable guarantee for the safe and stable operation of the power grid.

[0116] While the foregoing description has focused on embodiments, these are merely illustrative and do not limit the scope of the invention. Those skilled in the art will understand that various modifications and applications not illustrated above can be made without departing from the essential characteristics of the embodiments. For example, the constituent elements specifically shown in the embodiments can be implemented through modifications. Furthermore, various differences related to such modifications and applications should be interpreted as including within the scope of the invention as defined in the appended claims.

Claims

1. A gas sampling device, connected to a gas relay, for the safe release and sampling of gas within the gas relay, characterized in that: It includes an oil storage unit, an exhaust unit, a fluid transport unit, a gas collection unit, and a gas intake unit; The oil storage unit inputs and outputs fluid to the exhaust unit and discharges gas from the exhaust unit. The fluid delivery unit inputs or outputs the fluid from the exhaust unit to the gas collection unit; The gas collection unit collects gas from the gas relay. The gas extraction unit collects gas from the gas collection unit.

2. The gas extraction device as described in claim 1, characterized in that: The oil storage unit includes an oil storage container; The oil storage container is connected to the venting unit via a multi-way valve A.

3. The gas extraction device as described in claim 1, characterized in that: The exhaust unit includes a sealed oil tank; The sealed oil tank has a first port, a second port, and a third port; The first port is connected to the oil storage unit; The second port is connected to the exhaust valve; The third port is connected to the fluid delivery unit.

4. A gas extraction device as described in claim 1, characterized in that: The fluid delivery unit includes a fluid delivery mechanism; The fluid delivery mechanism is connected to the exhaust unit via a multi-port connector; The multi-port connector includes connector end I and connector end II; Wherein, the connector I end is connected to the exhaust unit; The connector II end is connected to the fluid delivery unit.

5. A gas extraction device as described in claim 4, characterized in that: The multi-port connector also includes connector III end; The pressure monitoring device is connected to end III of the connector.

6. A gas extraction device as described in claim 4, characterized in that: The fluid delivery mechanism has two operating modes: oil inlet and oil return, and is connected to the gas collection unit via a multi-way valve B.

7. A gas extraction device as described in claim 1, characterized in that: The gas collection unit includes a gas collection box; The gas collection box includes an oil inlet / outlet end, an air inlet end, and an air outlet end; The oil inlet and outlet are connected to the fluid transport unit; The air intake end is connected to the gas relay; The venting end is connected to the gas intake unit.

8. A gas extraction device as described in claim 7, characterized in that: The gas sampling unit includes a gas sampling mechanism and a sealing joint; The sealing joint is matched with the venting end and is connected in an openable manner; The gas extraction mechanism is connected to the gas collection unit via a one-way valve.

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